JP3703930B2 - sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing machine suitably used as a sewing machine or an embroidery machine for cloth, for example, and more particularly to a sewing machine that can automatically insert an upper thread into a needle hole of a sewing machine needle.
[0002]
[Prior art]
Generally, a sewing machine main body, a head part provided on the sewing machine body for reciprocating a sewing needle and swinging a balance, and a yarn storage part provided on the head part for individually storing a plurality of upper threads A plurality of sewing needles are provided on the lower end side of the head portion corresponding to each upper thread of the yarn storage portion, and each thread from the yarn storage portion is individually and individually attached to each sewing needle. A sewing machine such as a sewing machine or an embroidery machine is known in which any one of the sewing needles is selectively driven by a needle selection mechanism in the inserted state (threading).
[0003]
And in this type of prior art sewing machine, threading each thread from the thread storage part individually by manual operation or the like individually for a plurality of sewing needles provided on the lower end side of the head part, In this state, one of the sewing needles is selected by the needle selection mechanism, and the selected sewing needle is moved by the head portion so that the cloth is sewn.
[0004]
In this case, a plurality of upper thread bobbins are rotatably arranged in the thread storage portion, and different types of upper threads are wound around the bobbins, and frequently used upper threads are wound. The bobbin is wound around about 2 to 3 bobbins, and each of these bobbins is housed in the yarn housing portion. When the sewing needle is selected by the needle selection mechanism, the upper thread is individually fed out from each of these bobbins, and a seam is formed by sewing on the cloth or the like.
[0005]
[Problems to be solved by the invention]
By the way, in the above-described prior art, a plurality of sewing needles are provided in the head portion of the sewing machine body, and each thread from the thread storage portion is individually threaded manually in advance with respect to each sewing needle. Later, it is configured to select one of the sewing needles with the needle selection mechanism prior to the sewing work, so that not only the entire head portion is enlarged, but also the plurality of sewing needles provided in the head portion are specified in advance. Therefore, there is a problem in that it is a great obstacle to automating sewing work or embroidery work.
[0006]
Further, for example, sewing machines described in JP-A-61-89365, JP-A-6-154453, JP-A-6-182077, JP-A-7-671, and the like (hereinafter referred to as other conventional techniques). Then, for example, a proposal has been made to allow one of a plurality of threads to be selectively inserted into a single sewing needle provided in the head portion, thereby reducing the size of the entire head portion.
[0007]
However, in such other prior arts, it is difficult to automatically remove the old thread from the sewing needle and automatically thread the new thread through the sewing needle when changing the thread during the sewing operation. There's a problem. In particular, since the thread trimming is performed on the lower side of the sewing cloth when the thread is changed (color change) in the normal case, the cut end of the old thread often remains passing through the sewing cloth. There is a problem that it is not possible to automate the work of extracting and collecting the old thread from the sewing needle.
[0008]
Also, even when thread breakage occurs during sewing work, it is difficult to remove the old thread from the sewing needle and automatically thread the new thread through the sewing needle. While forming, there is a problem that it is difficult to smoothly guide the shaped yarn end side toward the needle hole of the sewing needle and thread it with high probability.
[0009]
The present invention has been made in view of the above-described problems of the prior art, and the present invention can selectively insert one of a plurality of threads into a sewing needle provided in the head portion, and can reduce the size of the entire head portion. An object of the present invention is to provide a sewing machine that can reliably extract an old thread from a sewing needle at the time of changing the thread, and then automatically thread a new thread through the sewing needle.
[0010]
Another object of the present invention is to allow the threading parts and the like to be retracted from the periphery of the sewing needle when performing a sewing operation while the threading is performed on the sewing needle. It is an object of the present invention to provide a sewing machine that prevents the sewing work from interfering with the sewing work and allows the whole work to proceed safely and smoothly.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention of claim 1 is directed to a sewing machine body, a head unit that is provided in the sewing machine body and reciprocates a sewing needle, and swings the balance, and a balance and sewing machine for the head unit. Thread storage means for storing a plurality of threads for supplying a thread to the needle, thread insertion means for selectively inserting the thread from the thread storage means into the balance and the sewing needle, and at least when changing the thread Thread pushing means for pushing the thread in a direction in which the thread is removed from the sewing needle, thread cutting means for cutting the thread from an intermediate position in a state where the thread is pushed by the thread pushing means, Of the yarns cut by the yarn cutting means, a configuration comprising yarn removing means for removing the yarn remaining on the yarn pushing means side to the outside is adopted.
[0012]
According to the above configuration, any one of the plurality of yarns stored in the yarn storage means can be selectively inserted into the head side balance and the sewing needle by the thread insertion means. When the thread inserted through the sewing needle is to be changed at least, the thread pushing means can be actuated so as to remove the thread from the sewing needle, and the thread cutting means can be actuated in this state. The thread can be cut from the middle part by the above, and by operating the thread removing means, the thread remaining on the side of the thread pushing means (for example, the old thread before changing the thread) among the threads cut by the thread cutting means is removed to the outside. can do.
[0013]
According to a second aspect of the present invention, the thread insertion means includes a thread path forming mechanism that is provided in the head portion and forms a thread path for threading at least the balance and a sewing needle, and the thread storage means. A yarn guide mechanism for individually guiding a plurality of stored yarns toward one end side of the yarn path by the yarn path forming mechanism, and any one of the plurality of yarns guided by the yarn guide mechanism A yarn selection mechanism for selecting the yarn, a yarn feed mechanism for feeding the yarn selected by the yarn selection mechanism toward one end side of the yarn path, and the other end of the yarn path by circulating gas in the yarn path A yarn guiding mechanism that guides the yarn toward the side and inserts the yarn from the yarn end side into the sewing needle, and the yarn cutting means is provided between one end side of the yarn path and a yarn feeding mechanism, The shape of the yarn end by cutting the tip side of the yarn sent out by the yarn feed mechanism It is configured to adjust.
[0014]
In this case, a plurality of yarns stored in the yarn storage means are individually guided by the yarn guide mechanism toward one end side of the yarn path by the yarn path forming mechanism, and one of these threads is selected as a thread. The yarn can be selected by a mechanism, and the selected yarn can be sent out toward one end of the yarn path by a yarn feeding mechanism. Next, if the yarn guiding mechanism is operated in this state, the yarn can be guided toward the other end side of the yarn path by circulating a gas in the yarn path, and the yarn can be guided from the yarn end side to the sewing needle. Can be inserted.
[0015]
The yarn cutting means provided between the one end side of the yarn path and the yarn feeding mechanism adjusts the shape of the yarn end by cutting the leading end side of the yarn that is selected in advance and sent out by the yarn feeding mechanism. In this case as well, the tip side of the yarn to be cut can be pushed toward the yarn removing means side by the yarn pushing means, and the yarn waste remaining on the yarn pushing means side after cutting the yarn ( For example, the tip end portion of the yarn) can be removed to the outside by the yarn removing means. Next, in this state, while the yarn is fed by the yarn feeding mechanism, a gas such as air is circulated in the yarn path by the yarn guiding mechanism, so that the yarn with the yarn end adjusted is passed through the needle hole of the sewing needle. It can be threaded smoothly.
[0016]
Furthermore, in the invention of claim 3, the yarn cutting means is preferably used for the yarn. Straight A pair of sandwiching blades that are opened and closed in the intersecting direction, a blade driving mechanism that opens and closes each sandwiching blade, and a position between one end side of the yarn path by the yarn path forming mechanism and each of the sandwiching blades. It is comprised from the thread | yarn come-off prevention tool which is fixed to the blade drive mechanism side and prevents that a thread | yarn remove | deviates from between each said pinching blades.
[0017]
As a result, when each pinch blade is driven to open and close by the blade drive mechanism, each pinch blade is set against the yarn. Straight In addition to being able to open and close in the intersecting direction, it is possible to prevent the yarn from coming off between the pinching blades with the yarn coming-off prevention tool, and the yarn can be stably cut by the pinching blades.
[0018]
Furthermore, in the invention of claim 4, the yarn pushing means is disposed between one end side of the yarn path by the yarn path forming mechanism and the yarn detachment preventing device, and guides the yarn toward the yarn path. A yarn guide having a guide hole for carrying out, a cross bar which is advanced and retracted so as to cross between the yarn guide and the yarn detachment preventing tool, and a yarn hooking portion of the cross bar is normally used. The thread is removed from between the thread guide and the thread detachment prevention tool with the thread hooked on the thread hooking portion of the crossbar at least when the thread is changed. It is comprised from the bar drive mechanism advanced toward the means side.
[0019]
According to the above configuration, the crossbar having the yarn hooking portion on the tip side can be advanced and retracted by the bar driving means so as to cross between the yarn guide and the yarn detachment preventing device. For example, a sewing needle can be used to push the thread in the crossbar advancement direction while the thread is hooked on the thread hooking portion of the crossbar when it is advanced toward the thread removal means from between the thread detachment prevention tool. The thread can be pulled up in the direction of the crossbar so as to remove the thread from the needle hole, and by cutting the thread in this state, for example, the old thread before thread replacement can be reliably removed to the outside.
[0020]
According to a fifth aspect of the present invention, the yarn fed by the yarn feeding mechanism is inserted into the guide hole of the yarn guide between the yarn feeding mechanism and each pinching blade of the yarn cutting means by gas flow. A yarn introduction nozzle for introducing the yarn guide, and the yarn guide has a lowered position where the upper end side of the guide hole is below the cross bar, and the upper end side of the guide hole is the yarn detachment preventing tool and each A yarn guide raising / lowering mechanism is provided for raising and lowering the yarn guide up and down between the raising position fitted to the lower end side of the yarn introduction nozzle via the sandwiching blades.
[0021]
According to the above-described configuration, the yarn fed from the yarn feeding mechanism is stabilized toward the guide hole of the yarn guide by allowing gas to flow through the yarn introduction nozzle while the yarn guide is held at the raised position. The yarn can be introduced and can be reliably guided to one end side of the yarn path via a yarn guide. Then, after the yarn is introduced to the yarn path side, the yarn guide is lowered to the lower side of the cross bar, so that the cross bar is moved from between the yarn guide and the yarn detachment prevention tool, for example, when changing the yarn. Advancing toward the removing means side is possible, and the thread changing operation and the like can be performed stably.
[0022]
On the other hand, in the invention of claim 6, the yarn removing means is constituted by a yarn sucker that sucks and removes the tip side portion of the yarn cut by the yarn cutting means.
[0023]
As a result, for example, when cutting the thread from the needle hole of the sewing needle at the time of thread change, the thread pushed by the crossbar is cut, and the thread suction side part (the old thread before thread change) is used by the thread sucker. Can be reliably sucked and removed to the outside.
[0024]
According to a seventh aspect of the present invention, the yarn path forming mechanism forms a thread path forming portion for a balance that extends in a curved or linear manner before and after the balance in order to pass the yarn through the balance. A thread path forming part for a sewing needle that forms a thread path that extends linearly before and after the sewing needle to insert the thread into the needle hole of the sewing needle, and a thread path forming part for the sewing needle A relay yarn path forming portion that is arranged between the balance yarn path forming portion and relays between the yarn paths, and the relay yarn path forming portion is threaded after passing through the sewing needle. In a state where the road is opened, the sewing needle is retracted in the direction away from the sewing needle together with the sewing needle thread path forming portion.
[0025]
Thereby, after threading through the sewing needle, the relay thread path forming portion can be retracted together with the sewing needle thread path forming portion in a direction away from the sewing needle. For example, when starting a sewing operation (sewing operation) The field of view around the sewing needle can be widened, and the relay yarn path forming part and the sewing needle thread path forming part can be prevented from interfering with the sewing work.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0027]
Here, FIGS. 1 to 14 show a case where the sewing machine according to the embodiment of the present invention is applied to an embroidery machine.
[0028]
In the figure, reference numeral 1 denotes a sewing machine main body constituting the main body of the embroidery machine. The sewing machine main body 1 is composed of a base 2 shown in FIG. 2 and a head portion 3 provided on the base 2. Yes. The head portion 3 of the sewing machine body 1 is fixed on the base 2 on the base end side (not shown), and the top side is a free end on the base 2 with an embroidery frame (not shown) on the base 2. It becomes the structure which opposes.
[0029]
Here, a spindle (not shown) driven by a spindle motor and a drive unit (not shown) for converting the rotation of the spindle into upper and lower reciprocating motions are provided in the head unit 3. The drive unit swings a later-described balance 7 up and down, and the needle shaft 4 and the sewing needle 5 that protrude from the lower end side of the head unit 3 toward the base 2 side as shown in FIG. To drive. Further, on the base 2 side, there are a needle plate 6, a lower thread bobbin around which a lower thread is wound, an embroidery frame origin sensor, a frame limit sensor (none of which are shown), etc. at a position facing the tip of the sewing needle 5. It is arranged.
[0030]
Reference numeral 7 denotes a balance that protrudes from the inside of the head portion 3 to the front side. The balance 7 is swung up and down substantially in synchronism with the sewing needle 5 by the driving portion of the head portion 3 and is swung downward. A slight slack is given to the upper thread 39, which will be described later, with the sewing needle 5, and the upper thread 39 is fed to the sewing needle 5 side. Further, when the balance 7 is swung upward, the upper thread 39 is pulled up from a seam (not shown) formed on the embroidery cloth by the sewing needle 5 to the upper thread 39 to be described later. A tension is applied through the tension 36, and the thread is tightened and the upper thread 39 is fed out. The head unit 3 is provided with a balance position detection sensor, a needle bar top dead center detection sensor, a thread breakage sensor (all not shown), and the like.
[0031]
Reference numeral 8 denotes a yarn path forming mechanism provided on the front surface side of the head unit 3. The yarn path forming mechanism 8 includes a balance thread path forming part 9 and a later-described relay thread path forming part as shown in FIGS. 15 and the sewing needle thread path forming portion 22 and the like. As shown in FIGS. 2 to 4, the balance yarn path forming portion 9 is provided with a flat plate-like fixing plate 10 fixed to the head portion 3, and an impact with respect to the fixing plate 10 via a guide or the like. In this case, the movable plate 11 is a flat plate-like movable plate 11 disposed so as to be separable. A balance yarn path 12 as a yarn path is formed between the abutting surfaces of the movable plate 11 and the fixed plate 10.
[0032]
Here, the balance thread path 12 is formed in front of and behind the balance 7 or the like by, for example, forming a semicircular or U-shaped concave groove on the abutting surface between the fixed plate 10 and the movable plate 11. It is formed as a narrow groove extending in a curved line or a straight line. As shown in FIG. 4, the balance thread path 12 includes first and second thread path portions 12A and 12B that sandwich the thread hole (not shown) of the balance 7 before and after, and the first thread path. The portion 12A extends downward from a position of a thread guide 54, which will be described later, bends in a substantially L shape with a certain curvature, and extends linearly toward the position of the balance 7.
[0033]
The second yarn path portion 12B extends slightly linearly from the position of the balance 7 and then bends in an L shape with a certain curvature downward and obliquely downward toward the relay yarn path 20 described later. It extends in a straight line. Then, the movable plate 11 of the balance yarn path forming portion 9 is advanced and retracted toward the fixed plate 10 by an actuator 14 and the like which will be described later, and the abutting surface of the movable plate 11 is tightly adhered to the abutting surface of the fixed plate 10 in an airtight state. When this is done, the balance thread path 12 is formed as an air passage between the fixed plate 10 and the movable plate 11.
[0034]
13 is a guide hole for the balance formed in the fixed plate 10 and the movable plate 11 of the yarn path forming section 9 for the balance. The guide hole 13 for the balance is moved up and down along the swinging locus of the balance 7 as shown in FIG. It extends by a certain length in the direction, and allows the balance 7 to swing up and down during the sewing operation (embroidery work). Further, the fixed plate 10 and the movable plate 11 of the balance yarn path forming portion 9 have an upper side extending along the balance guide hole 13 to the upper end of the balance guide hole 13 and a lower side with respect to the balance guide hole 13. A lever guide hole 13A formed in an arc shape with a constant curvature is provided. The lever guide hole 13A is configured to allow the yarn hooking portion 84B side of the yarn spreading lever 84, which will be described later, to swing in the direction of arrow A in FIG.
[0035]
Reference numeral 14 denotes an actuator as a yarn path opening means provided between the fixed plate 10 and the movable plate 11 of the balance yarn path forming portion 9, and the actuator 14 is supplied and discharged with air pressure from the outside, The movable plate 11 is moved back and forth toward the fixed plate 10 through a guide or the like, and the movable plate 11 is abutted or separated from the fixed plate 10. Then, the actuator 14 completes the threading operation, and before starting the sewing machine operation, the movable plate 11 is separated from the fixed plate 10 to release the balance thread path 12 and the upper thread 39 from the balance thread path 12. Make it free.
[0036]
Reference numeral 15 denotes a relay yarn path forming portion provided on the front side of the head portion 3 and positioned below the balance yarn path forming portion 9, and the relay yarn path forming portion 15 is as shown in FIGS. 2 to 4. A fixing plate 17 whose upper end side is swingably coupled to the balance thread passage forming portion 9 on the lower end side of the fixing plate 10 via a bearing portion 16 and whose lower end side extends downward to the position of the sewing needle 5; The movable plate 19 is arranged so as to be able to abut against and be separated from the fixed plate 17 via guides 18 and 18, and the movable plate 19 is located on the abutting surface side with the fixed plate 17 and faces downward. The extending relay yarn path 20 is formed as a narrow groove formed of a concave groove having a U-shaped cross section having a depth of about 0.5 to 1 mm, for example.
[0037]
Here, as shown in FIG. 3 and the like, the relay yarn path 20 has a linear yarn path portion 20A that has an upper end side facing the lower end side of the balance thread path 12 and has a lower end side extending downward, and the linear thread path. The curved portion 20B is bent from a lower end side of the portion 20A into a substantially “shi” shape with a certain curvature and extends in a horizontal direction toward a yarn posture corrector 23 described later. The fixed plate 17 and the movable plate 19 of the relay yarn path forming portion 15 are formed in an elongated flat plate shape, and the lower end side thereof is curved along the curved yarn path portion 20B of the relay yarn path 20.
[0038]
Note that the abutting surfaces of the fixed plate 17 and the movable plate 19 of the relay yarn path forming portion 15 are formed as smooth surfaces, and can be abutted in an airtight state. A plurality of supply / discharge nozzles (not shown) serving as a yarn guiding mechanism are provided in the middle of the balance thread path 12 and the relay thread path 20, and these supply / discharge nozzles supply air from a pressure source. By supplying / discharging into / from the balance thread path 12 and the relay thread path 20 via a supply / discharge valve (not shown), negative pressure or positive pressure is generated in the balance thread path 12 and the relay thread path 20. For example, the upper thread 39 in a state where the yarn end is shaped is guided along the balance thread path 12 and the relay thread path 20 to the yarn posture corrector 23 side.
[0039]
Reference numeral 21 denotes an actuator as a yarn path opening means provided between the fixed plate 17 and the movable plate 19 of the relay yarn path forming portion 15, and the actuator 21 is movable by supplying and discharging air pressure from the outside. 19 is driven along each guide 18, and the movable plate 19 is abutted or separated from the fixed plate 17. When the movable plate 19 is brought into contact with the fixed plate 17 by the actuator 21 as shown in FIG. 4, the relay yarn path 20 is formed as an air passage between the movable plate 19 and the fixed plate 17.
[0040]
The actuator 21 is free so that the relay yarn path 20 is opened and the upper thread 39 can be detached from the relay yarn path 20 when the movable plate 19 is separated from the fixed plate 17 in the direction indicated by the arrow B in FIG. And Furthermore, the lower end side of the fixing plate 17 of the relay yarn path forming portion 15 is fixed on an extension portion 30A of the swing bracket 30 described later, and the thread path for the sewing needle along the rotation center OO of the swing bracket 30. 4 is configured to be retracted with a swing angle θ from the front and rear of the sewing needle 5 together with the forming portion 22 to the position indicated by the phantom line in FIG.
[0041]
Reference numeral 22 denotes a thread path forming portion for a sewing needle that constitutes the thread path forming mechanism 8 together with the balance thread path forming portion 9 and the relay yarn path forming portion 15 and the like. The container 23 and the thread suction device 26 are constructed in substantially the same manner as previously proposed by the applicant in Japanese Patent Application No. 8-75157.
[0042]
Reference numeral 23 denotes a yarn posture correcting device as a yarn posture correcting portion disposed so as to be able to advance and retreat between the lower end side of the relay yarn path forming portion 15 and the sewing needle 5. The yarn posture correcting device 23 is shown in FIGS. As shown in FIG. 4, the nozzle halves 24A and 24B provided on the extension 30A of the swing bracket 30 and divided into two on the lower side and the sewing needle 5 formed between the nozzle halves 24A and 24B. A nozzle-like yarn path (not shown) extending linearly toward the needle hole 5A and the nozzle half-divided body 24A provided on the extension 30A of the swing bracket 30 adjacent to the nozzle half-divided bodies 24A, 24B. It is comprised from the correction | amendment cylinder 25 which abuts and separates 24B in the up-down direction.
[0043]
Here, the correction cylinder 25 is configured as an air cylinder as shown in FIG. 3, and the rod 25C is expanded and contracted by supplying and discharging air pressure from the pair of air supply / discharge ports 25A and 25B. The nozzle half 24A is moved up and down relative to the lower nozzle half 24B. The nozzle half 24A is separated from the nozzle half 24B when raised, and the lower surface side of the nozzle half 24A is brought into contact with the nozzle half 24B when the nozzle half 24A is lowered. .
[0044]
The nozzle halves 24A and 24B form the nozzle-like thread path between the nozzle halves 24A and 24B when they are brought into contact with each other. In this state, the nozzle-like thread path has a curved thread path on one end side. The portion 20B faces the front end side, and the other end side faces the needle hole 5A of the sewing needle 5. Further, when the nozzle half 24A is separated upward from the nozzle half 24B by the correction cylinder 25, the nozzle-like thread path is opened, and the tip side is inserted into the needle hole 5A of the sewing needle 5, for example, toward the balance 7 side. The upper yarn 39 extending in a free state is automatically released from the nozzle-like yarn path.
[0045]
Further, an air introduction port (not shown) or the like is formed in one of the nozzle halves 24A and 24B, and this air introduction port allows the air from the pressurized air source to pass through the air supply / discharge valve etc. Squirt toward the downstream side of the thread path. The yarn posture corrector 23 is configured such that one end side of the nozzle-like yarn path is directly opposed to the distal end side of the curved thread path portion 20B and the other end side is opposed to the needle hole 5A of the sewing needle 5. By blowing air from the air inlet toward the downstream side of the nozzle-like yarn path, the yarn posture of the upper thread 39 is corrected in a straight line in the nozzle-like yarn path and cooperates with the yarn suction device 26 described later. Then, the upper thread 39 is inserted into the needle hole 5 </ b> A of the sewing needle 5.
[0046]
Reference numeral 26 denotes a yarn suction device as a yarn suction portion attached to the swing bracket 30 so as to face the nozzle-like yarn path of the yarn posture correcting device 23 across the needle hole 5A of the sewing needle 5. Has a small-diameter thread suction part 26A on one end side and faces the needle hole 5A of the sewing needle 5, and the other end side is a withdrawal part 26B for the upper thread 39. An air introduction port (not shown) is formed in the middle portion in the longitudinal direction of the yarn suction device 26, and this air introduction port circulates air from the pressurized air source toward the drawing portion 26B. At this time, a negative pressure is generated on the side of the yarn suction portion 26A by the air flow, whereby the upper thread 39 from the yarn posture corrector 23 is inserted into the needle hole 5A of the sewing needle 5, and the yarn suction portion 26A. Is led to the position of the lead-out portion 26B.
[0047]
Here, the yarn posture corrector 23 and the yarn suction device 26 constitute the yarn path forming mechanism 8 together with the balance yarn path forming unit 9 and the relay yarn path forming unit 15, and the correction cylinder 25 of the yarn posture corrector 23 is a yarn. It constitutes a part of the road opening means. Further, the air introduction port of the yarn posture corrector 23 and the yarn suction device 26 constitutes a yarn guiding mechanism for the upper yarn 39 together with the supply / discharge nozzle of the balance thread passage 12 and the relay yarn passage 20, and air as gas The upper thread 39 is guided toward the needle hole 5A of the sewing needle 5 by the flow.
[0048]
Reference numeral 27 denotes a threading detector as a threading detection means provided on the swing bracket 30 so as to face the drawing portion 26B of the thread suction device 26. The threading detector 27 includes an optical sensor or the like, Whether or not the upper thread 39 has been inserted into the sewing needle 5 is detected by detecting whether or not the leading end side of the upper thread 39 has been withdrawn from the drawing portion 26B of the container 26. When the threading detector 27 detects that the upper thread 39 has been inserted into the sewing needle 5, the threading detector 27 outputs a threading completion signal to an embroidery machine control device (not shown) or the like, and an advance / retreat mechanism 28 described later. Is activated.
[0049]
Reference numeral 28 denotes an advancing / retreating mechanism for advancing / retreating the sewing needle thread path forming part 22 together with the relay thread path forming part 15 to the front and the back of the sewing needle 5, and the advancing / retreating mechanism 28 is, as shown in FIG. The rotating cylinder 29 disposed on the rotation center O-O together with the bearing section 16 and the upper end side of the rotating cylinder 29 are connected to the rotating cylinder 29, and the lower end side extends toward the thread needle forming part 22 for the sewing needle. The swing bracket 30 is a connecting member, and a pulley 31 described later. The swing bracket 30 can detect the swing position by a position detection sensor (not shown).
[0050]
Here, as shown in FIG. 3, the lower end side of the swing bracket 30 is integrally provided with an extension portion 30 </ b> A extending horizontally from the lower side of the sewing needle 5 to the position of the fixing plate 17 of the relay yarn path forming portion 15. The extension portion 30A is configured to integrally support the relay yarn path forming portion 15 together with the sewing needle thread path forming portion 22 (the yarn posture correcting device 23 and the yarn suction device 26). The swing bracket 30 is advanced and retracted from the sewing needle 5 with a swing angle θ as shown in FIG. 4 by a rotation source (not shown) such as a stepping motor, and the relay thread path forming portion 15 and the sewing needle thread path forming portion. 22 is swung between a threading position indicated by a solid line and a retracted position indicated by an imaginary line in FIG.
[0051]
Reference numeral 31 denotes a pulley integrated with the rotating cylinder 29. The pulley 31 is driven by the rotation source via a timing belt (not shown) or the like. Then, the swing bracket 30 and the pulley 31 of the advance / retreat mechanism 28 open the thread-like thread path 12 for the balance, the relay thread path 20 and the nozzle-like thread path of the thread posture corrector 23 after threading through the sewing needle 5. A path opening means is configured together with the actuators 14 and 21.
[0052]
Reference numerals 32 and 33 denote fine adjustment mechanisms provided on the back side of the head unit 3. The fine adjustment mechanisms 32 and 33 rotate the knobs 32A and 33A manually according to the type of the sewing machine needle 5 and the like. As a result, the swing bracket 30 is moved in the directions indicated by arrows C and D in FIG. Thereby, the positions of the yarn posture corrector 23 and the yarn suction device 26 are finely adjusted so as to face the needle hole 5A of the sewing needle 5 before and after.
[0053]
Reference numeral 34 denotes a support plate provided on the head unit 3, and the support plate 34 is a substantially rectangular flat plate. On the support plate 34, a tension table 35, a thread selection mechanism 40, a thread feed mechanism 51, and the like, which will be described later, are arranged. It is installed. Further, as shown in FIG. 9 and the like, a guide hole 34A is formed in the support plate 34, and the guide hole 34A extends with a certain length in the direction of arrow E in FIG. And the nozzle end 50A side of each thread | yarn introduction nozzle 50 mentioned later is inserted in the guide hole 34A, respectively so that relative displacement is possible.
[0054]
Reference numeral 35 denotes a tension base disposed so as to extend upward from above the support plate 34. As shown in FIGS. 1 and 2, the tension base 35 is mounted on a sliding plate 42 of a thread selection mechanism 40 described later. For example, when the upper thread 39 is selected, it is configured to move horizontally in the direction of arrow E in FIG.
[0055]
As shown in FIG. 2, for example, about 10 to 20 thread tensions 36, 36,... (Only five are shown) are provided on the tension table 35 via the holding plates 37, etc. On the rear side, a total of about 10 to 20 cheese cases (not shown) serving as yarn storage means are arranged. Further, each holding plate 37 is provided with a thread guide portion 38, 38,... Located below the thread tension 36, etc., and each thread guide portion 38 together with the tension base 35 is provided from each cheese case. A yarn guide mechanism for guiding the upper yarn 39 toward each yarn introduction nozzle 50 is configured.
[0056]
Here, in each cheese case, an upper thread 39 is stored in a wound state via a bobbin (not shown), and each upper thread 39 is a thread of a different type (color). It consists of Of the upper threads 39 stored in each cheese case, the upper thread 39 that is frequently used is stored in the same type (color), for example, in two cheese cases via bobbins.
[0057]
Each thread tension 36 is provided with a thread take-up spring 36A that applies tension to the upper thread 39 by hooking the upper thread 39 on the outer peripheral side, and the upper thread 39 is directed toward the thread introduction nozzle 50 and the balance 7 by using a low friction yarn. The thread is replenished. Each thread tension 36 applies a tension of, for example, about 25 to 50 g to the upper thread 39 via the thread take-up spring 36A, and when the upper thread 39 is pulled beyond this tension by the sewing needle 5 or the like, the balance 7 side The upper thread 39 is allowed to be fed toward the head.
[0058]
Each yarn guide portion 38 of the tension base 35 is provided with a yarn cost consumption sensor (not shown) made of, for example, an optical sensor. Each of these yarn cost consuming sensors detects whether or not the upper yarn 39 is inserted into each yarn guide portion 38, so that each upper yarn 39 stored in each cheese case is completely removed by the sewing operation. It is detected upstream of the yarn introduction nozzle 50 whether it has been consumed, that is, whether or not the upper yarn 39 has been consumed in the sewing machine operation and has been used up. As a result, even if a thread breakage occurs in the upper thread 39 on the head part 3 side of the sewing machine main body 1, in this case, the upper thread 39 is held while being inserted in each thread cost consuming sensor (thread guide part 38). As a result, the embroidery machine control device can reliably identify when the thread breaks and when the thread is consumed (end of use).
[0059]
Reference numeral 40 denotes a thread selection mechanism for selecting any one of the upper threads 39 guided from the cheese cases. The thread selection mechanism 40 is provided on the support plate 34 as shown in FIGS. A guide base 41 fixed to the guide base 41, a slide plate 42 slidably disposed on the guide base 41 and sliding the tension base 35 and the like in the direction of arrow E in FIG. The slider 43 is fixed to the end surface on the front end side and moves on the support plate 34 together with the sliding plate 42, and includes a pulley 44 and a guide roller 46 which will be described later. A position detector for detecting the position of the slider 43 on the support plate 34 and a thread selection thread number sensor for detecting which upper thread 39 is selected from the upper threads 39 (both not shown). Etc.) are arranged.
[0060]
A pulley 44 is rotatably provided on the guide base 41. The pulley 44 is connected to a yarn selection motor (not shown) such as a stepping motor via a timing belt 45 as shown in FIG. It is rotationally driven by a selection motor. Further, a screw feed mechanism (not shown) is provided between the guide base 41 and the sliding plate 42 of the thread selection mechanism 40, and this screw feed mechanism is used to rotate the pulley 44 in the forward and reverse directions. Accordingly, the sliding plate 42 is slid in the direction of arrow E in FIG. Then, the yarn selection mechanism 40 drives the slider 43 at a constant pitch via a screw feed mechanism or the like with the yarn selection motor, so that any one of the upper yarns 39 among the upper yarns 39 will be described later. Selectively move to position 52.
[0061]
A guide roller 46 is rotatably provided on the slider 43, and the guide roller 46 is urged toward the yarn feed roller 52 by a spring 47 so as to be in contact with the yarn feed roller 52. The guide roller 46 is rotated by being driven by the yarn feed roller 52 in contact with the yarn feed roller 52, so that the upper yarn 39 selected between the guide roller 46 and the yarn feed roller 52 is moved toward the yarn introduction nozzle 50. It compensates for being sent out.
[0062]
48 is a swinging arm attached to the guide roller 46, 49 is a pressing cylinder for moving the guide roller 46 back and forth from the yarn feed roller 52 via the swinging arm 48, and the pressing cylinder 49 is composed of an air cylinder or the like. When extended as shown in FIG. 1, the swing arm 48 is driven against the spring 47. The pressing cylinder 49 is configured to forcibly separate the guide roller 46 from the yarn feed roller 52 in the extended state shown in FIG. 1 and stop the sending of the upper yarn 39 by the yarn feed roller 52 at this time. Yes.
[0063]
50, 50,... Are yarn introduction nozzles arranged below the guide roller 46 and arranged on the surface side of the slider 43. Each yarn introduction nozzle 50 is interposed between the support plate 34 and the yarn feed roller 52. The yarn guide mechanism is configured together with each yarn guide portion 38 on the tension base 35 side. Each yarn introduction nozzle 50 introduces each upper yarn 39 from each cheese case into a yarn guide 54 to be described later, so that the number corresponding to each cheese case is arranged in a row on the surface side of the slider 43. Has been.
[0064]
Further, the lower end side of the yarn introduction nozzle 50 becomes a nozzle end 50A, and the nozzle end 50A protrudes downward through the guide hole 34A of the support plate 34. Each yarn introduction nozzle 50 is moved at a constant pitch in the direction of arrow E in FIG. 2 together with the slider 43 of the yarn selection mechanism 40 when the upper yarn 39 is selected, and any one of the yarn introduction nozzles 50 is selected. The introduction nozzle 50 (the yarn introduction nozzle 50 corresponding to the selected upper yarn 39) is opposed to the yarn guide 54 above and below.
[0065]
Further, each yarn introduction nozzle 50 is supplied and discharged with air from the outside, thereby generating an air flow toward the yarn guide 54 in the yarn introduction nozzle 50, and the upper yarn 39 is turned into the yarn by the air flow at this time. It is inserted (guided) into the introduction nozzle 50. Then, the leading end side of the upper thread 39 fed out from the thread feeding roller 52 with a constant feed amount is inserted into the thread introduction nozzle 50 and further fed downward, thereby allowing the balance thread to pass through the thread guide 54. It is introduced into the yarn path portion 12A of the path forming section 9.
[0066]
A yarn feeding mechanism 51 feeds the upper yarn 39 selected by the yarn selection mechanism 40 to the yarn introduction nozzle 50 side. The yarn feeding mechanism 51 is connected to the guide roller 46 as shown in FIG. The yarn feeding roller 52 that sandwiches the side and a yarn feeding motor 53 that rotationally drives the yarn feeding roller 52 via a belt (not shown) or the like are roughly configured.
[0067]
Here, the yarn feed motor 53 comprises a stepping motor or the like as shown in FIG. 2, and rotationally drives the yarn feed roller 52 with a constant rotation amount when the guide roller 46 is in the operating position. At this time, the yarn feed roller 52 rotates with the guide roller 46 while sandwiching the upper yarn 39 with the guide roller 46, so that the upper yarn 39 faces the yarn introduction nozzle 50 side in advance. It is configured to send out a predetermined amount of feed.
[0068]
A yarn guide 54 guides the upper yarn 39 from the yarn introduction nozzle 50 into the yarn path 12A of the balance yarn path forming portion 9. The yarn guide 54 constitutes a yarn pushing means together with a cross bar 60 and the like which will be described later. However, as shown in FIG. 9, it is formed in a stepped cylindrical shape. Then, the inner peripheral side of the yarn guide 54 becomes a guide hole 54A for guiding the upper thread 39 into the yarn path portion 12A, and the upper end side of the guide hole 54A is expanded in a taper shape, and as shown in FIG. 50 is configured to be detachably fitted to the lower end side of 50.
[0069]
Reference numeral 55 denotes a thread guide lifting mechanism for lifting the thread guide 54 up and down. The thread guide lifting mechanism 55 is disposed on the support plate 34 as shown in FIGS. An elevating cylinder 56 protruding downward, an elevating plate 57 fixed to the lower end side of the rod 56A of the elevating cylinder 56, and moved up and down in accordance with the expansion and contraction of the rod 56A, and the elevating plate 57 is connected to the rod 56A And a holder plate 59 fixed to the lower surface side of the support plate 34 so as to hold the upper end side of each of the elevating guides 58. Yes.
[0070]
Here, the lifting plate 57 is integrally formed with an arm portion 57A extending toward the yarn guide 54, and the yarn guide 54 is integrated with the tip side of the arm portion 57A using means such as screwing. ing. Further, as shown in FIG. 7, the elevating cylinder 56 is composed of an air cylinder or the like, and the air from the pressurized air source is supplied / exhausted through the air supply / exhaust portions 56B, 56C, whereby the elevating plate 57 is provided via the rod 56A. Is moved up and down together with the thread guide 54.
[0071]
When the yarn guide 54 reaches the raised position shown in FIG. 10, the upper side thereof is inserted into a yarn detachment prevention tool 74 of the yarn trimmer 71 described later, and the upper end side of the guide hole 54A is connected to the yarn introduction nozzle 50. Fit to the tip (lower end) side. Further, when the thread guide 54 is in the lowered position shown in FIG. 11, the upper end side is below the cross bar 60, and the cross bar 60 is located between the thread guide 54 and the thread detachment preventing tool 74 in FIG. It is allowed to move forward and backward in the direction of arrows F1 and F2.
[0072]
Reference numeral 60 denotes a crossbar that pushes the upper thread 39 in the direction of removing the upper thread 39 from the sewing needle 5 when changing the thread. The crossbar 60 is threaded together with the thread guide 54 and a bar drive mechanism 61 described later. Means. The cross bar 60 is driven in the directions indicated by arrows F1 and F2 by the bar driving mechanism 61 shown in FIG. 8, and is advanced and retracted so as to cross between the yarn guide 54 and the yarn detachment preventing device 74 as shown in FIG. It is.
[0073]
Here, the cross bar 60 becomes a yarn hooking portion 60A having a V-shaped tip, and for example, when the cross bar 60 advances in the direction of arrow F1 shown in FIG. Is moved to a position exceeding this toward the yarn sucker 69 side. In this state, the cross bar 60 pushes the upper thread 39 so as to be pulled up from the thread guide 54 side while the upper thread 39 is hooked on the thread hooking portion 60A.
[0074]
Reference numeral 61 denotes a bar driving mechanism for driving the cross bar 60. The bar driving mechanism 61 is slidably arranged in the directions indicated by arrows G1 and G2, and is driven by a rod 62A of an air cylinder 62 as shown in FIG. A bar 63, a pinion 64 that meshes with the rack bar 63 and rotates following the movement of the rack bar 63, meshes with the pinion 64, and rack teeth 60 </ b> B formed on the base end side of the cross bar 60. The other pinion 65 engaged, and the presser rollers 66 and 67 etc. which press the rack bar 63 and the base end side of the cross bar 60 toward the pinion 64 and 65 side are comprised.
[0075]
Here, the air cylinder 62 of the bar driving means 61 rotationally drives the pinions 64 and 65 by sliding the rack bar 63 in the directions indicated by arrows G1 and G2 in FIG. 8, and at this time, the rotation of the pinion 65 is crossed. By being transmitted to the rack teeth 60B of the bar 60, the cross bar 60 is advanced and retracted in the directions indicated by arrows F1 and F2 in FIG. Then, until the upper thread 39 is pushed as shown in FIG. 9, the cross bar 60 continues to move backward in the direction of arrow F2 toward the rear side of the thread detachment prevention tool 74 shown in FIG. As shown in FIG. 11, it is compensated that the upper thread 39 is guided linearly from the thread introduction nozzle 50 side to the thread guide 54 side.
[0076]
68 is a bar support piece slidably in contact with the lower surface of the cross bar 60. The bar support piece 68 is disposed on the lower side of the cross bar 60 at a position close to the thread detachment preventing tool 74 as shown in FIG. The cross bar 60 is slidably guided in the directions indicated by arrows F1 and F2 with the yarn detachment prevention tool 74.
[0077]
69 is a yarn sucking device constituting the yarn removing means. As shown in FIGS. 7 to 9, the yarn sucking device 69 is separated from the yarn guide 54 by a certain dimension (for example, about 3 to 5 cm) and A thread suction port 69 </ b> A is opened on the upper surface side of the yarn sucker 69. The yarn sucker 69 generates a negative pressure in the yarn suction port 69A by air from the pressure source, etc., and the tip portion of the upper yarn 39 cut by the sandwiching blades 72 and 73 of the yarn trimmer 71 described later. Is sucked and removed to the outside of the sewing machine main body 1 and the like through the yarn suction port 69A.
[0078]
Reference numeral 71 denotes a thread trimming device as a thread cutting means for cutting the upper thread 39 pushed by the cross bar 60 at an intermediate position. The thread trimming device 71 is positioned above the thread guide 54 as shown in FIGS. Then, a pair of sandwiching blades 72, 73 disposed below the support plate 34 and opened / closed in a direction substantially perpendicular to the upper thread 39, and a blade drive described later for driving the sandwiching blades 72, 73 to open / close. A thread release prevention tool 74 that is positioned below the mechanism 76 and the sandwiching blades 72 and 73 and is fixed to the distal end side of a support case 77 described later, and has an insertion hole 74A through which the upper side of the thread guide 54 is inserted. It is roughly composed of
[0079]
Here, even when the upper thread 39 is pushed in the direction of arrow F1 by the cross bar 60 with the upper thread 39 inserted through the insertion hole 74A as illustrated in FIG. The upper thread 39 is prevented from coming off between the sandwiching blades 72 and 73.
[0080]
Further, the sandwiching blades 72 and 73 are opened and closed so as to intersect each other with the support pin 75 on the support case 77 as a center, and the upper thread 39 is cut so as to shape the yarn end of the upper thread 39. The sandwiching blades 72 and 73 have a configuration in which the cutting edge on the tip side can be replaced as necessary. Long hole-like engagement holes 72A and 73A are formed on the base end sides of the sandwiching blades 72 and 73, respectively, and projections 82A and 83A of crank gears 82 and 83 to be described later are formed in the engagement holes 72A and 73A. It is slidably engaged.
[0081]
76 is a blade driving mechanism for driving the sandwiching blades 72, 73. As shown in FIGS. 6 and 8, the blade driving mechanism 76 has each bracket portion 77A on one end side and each fixing bolt 78 on the lower surface of the support plate 34. A support case 77 fixed through the like, an air cylinder 79 fixed to the other end of the support case 77, a rack 80 driven in the directions indicated by arrows H1 and H2 by the air cylinder 79, and a support case A pinion 81 that is rotatably attached to one end side of 77 and meshes with the rack 80, and a pair of crank gears 82 and 83 that are rotatably attached to one end side of the support case 77 so as to mesh with the pinion 81. It is roughly structured.
[0082]
Here, the crank gears 82 and 83 are formed by spur gears having the same shape, and the pinion 81 is rotated, for example, 2-3 times while the rack 80 is reciprocated once in the directions indicated by the arrows H1 and H2 by the air cylinder 79. Are driven to rotate in synchronization with the directions of arrows I1, I2 and J1, J2. The crank gears 82 and 83 are provided with projections 82A and 83A for engaging with the engaging holes 72A and 73A of the sandwiching blades 72 and 73, whereby the rack 80 is moved in the directions indicated by the arrows H1 and H2 in the crank gears 82 and 83. During one reciprocation, the sandwiching blades 72 and 73 are opened and closed two to three times.
[0083]
Numeral 84 is a yarn separating lever provided on the fixing plate 10 side of the yarn path forming portion 9 for the balance. As shown in FIG. 1, the yarn separating lever 84 has a base end side as a rotation center 84A and a yarn separating motor 85. It is connected to the output shaft 85A via a worm gear type reduction gear (not shown) or the like. Further, as shown in FIG. 4, the tip side of the yarn separating lever 84 becomes a yarn hooking portion 84B and is inserted into the lever guide hole 13A, and along the lever guide hole 13A in the direction of arrow A in FIG. It is driven by a yarn separating motor 85 so as to be swung.
[0084]
Here, the yarn separating lever 84 has a yarn path portion of the balance thread passage 12 so that the yarn hooking portion 84B faces the balance 7 on the left and right as shown by the solid line in FIG. 4 when threading the sewing needle 5. 12A and 12B, and after threading through the sewing needle 5, as shown by the phantom line in FIG. Moved).
[0085]
The embroidery machine according to this embodiment has the above-described configuration. Next, the automatic threading operation will be described.
[0086]
First, as an operation preparation operation of the embroidery machine, the leading end side of each upper thread 39 stored in each cheese case on the tension stand 35 side is guided to each thread tension 36, and each upper thread 39 is guided to each upper thread 39 by each thread tension 36. In this state, each upper thread 39 is inserted into each thread guide portion 38 and the like while allowing a constant tension to be applied, and then to the surface side of the slider 43 via each thread retainer (not shown). Guide it down.
[0087]
Next, while selecting each one of these upper threads 39 by the thread selection mechanism 40, the selected upper thread 39 is sent from the tip side to the thread introduction nozzle 50 side by the thread feed roller 52 via the guide roller 46. . Then, air is supplied to and discharged from the outside to the yarn introduction nozzle 50 corresponding to the selected upper yarn 39 to generate an air flow toward the nozzle end 50A in the yarn introduction nozzle 50, thereby selecting the selected one. The upper thread 39 is inserted (guided) into the thread introduction nozzle 50.
[0088]
Further, in this state, as shown in FIG. 10, the yarn guide 54 continues to feed the upper yarn 39 by the yarn feeding roller 52 while raising the upper end of the yarn guide 54 to a position where the upper end side is fitted to the nozzle end 50A of the yarn introduction nozzle 50. The upper end of the upper thread 39 is, for example, sent by an extra 10 cm downward from the nozzle end 50A side of the thread introducing nozzle 50 toward the thread guide 54.
[0089]
Next, in this state, the thread guide 54 is lowered to the lowered position shown in FIG. 11, and the cross bar 60 advances in the direction of arrow F1 in FIG. 9 so as to cross between the thread guide 54 and the thread detachment prevention tool 74. Let Then, the yarn hooking portion 60A provided on the front end side of the cross bar 60 is moved to a position beyond the yarn sucker 69 with a moving amount of, for example, about 5 cm, and the upper thread 39 is hooked on the yarn hooking portion 60A at this time. Thus, the upper thread 39 is pushed from the position of the insertion hole 74A of the thread detachment prevention tool 74 to the position of the thread sucker 69.
[0090]
In this state, the thread trimming device 71 is operated, and the upper thread 39 is cut between the pinching blades 72 and 73, whereby the cut end portion of the upper thread 39 protruding downward from the nozzle end 50A of the thread introduction nozzle 50 is removed. Performs yarn end shaping to form an edge. Further, the portion of the remaining upper thread 39 pushed out by the cross bar 60 in the direction of the arrow F1 and cut off between the pinching blades 72 and 73 from the thread introduction nozzle 50 side is sucked by the thread sucker 69 by air. Remove to the outside as lint.
[0091]
Further, with respect to the upper yarn 39 that has been subjected to the yarn end shaping as described above, the yarn feed roller 52 is temporarily set so that the yarn end side is accommodated in the yarn introduction nozzle 50 until the threading operation described later is performed. The yarn end side of the upper yarn 39 is once sent back into the yarn introduction nozzle 50 through the guide roller 46. As a result, the yarn end of the upper yarn 39 can be prevented from being defibrated or frayed before the actual threading operation is started, and the yarn end can be held in an edge-shaped state.
[0092]
Thus, the above-described preparatory work is repeated for each upper thread 39, and each upper thread 39 in a state where the yarn end shaping has been performed in advance is kept in each thread introduction nozzle 50. In this state, the actual automatic threading operation is started as follows.
[0093]
First, in this case, the balance motor 7 is swung by the spindle motor, and the balance 7 is moved to the threading position of the balance 7 that is the top dead center position (the height position that is a certain distance away from the needle plate 6), for example. Let As a result, the thread hole of the balance 7 can be aligned between the thread path portions 12A and 12B of the balance thread path 12.
[0094]
Further, the yarn path forming mechanism 8 is operated to cause the nozzle halves 24A and 24B of the yarn posture corrector 23 to collide with each other to form the nozzle-shaped thread path therebetween, and the advance / retreat mechanism 28 swings the bracket. By swinging 30, the thread passage forming portion 22 for the sewing needle consisting of the yarn posture correcting device 23 and the yarn suction device 26 is brought into the threading position indicated by a solid line in FIG. The nozzle-like yarn path of the container 23 and the yarn suction portion 26A of the yarn suction device 26 are made to face (face to face) the needle hole 5A of the sewing needle 5.
[0095]
Further, the movable plate 11 of the balance yarn path forming portion 9 is abutted (contacted) with the fixed plate 10 to form a balance yarn path 12 between the fixed plate 10 and the movable plate 11, and the relay yarn path. The movable plate 19 of the forming unit 15 is abutted (contacted) with the fixed plate 17, and a relay yarn path 20 is formed between the movable plate 19 and the movable plate 19.
[0096]
As a result, the curved yarn path portion 20B of the relay yarn path 20 comes to face the nozzle-shaped thread path of the yarn posture corrector 23 at the tip side. Further, at this time, the yarn spreading lever 84 is raised to the threading position shown by the solid line by the yarn spreading motor 85 shown in FIG. 1, and the yarn hooking portion 84B of the yarn spreading lever 84 is adjusted to the right and left of the balance 7 with the yarn hole. Try to match.
[0097]
Next, in order to select the upper thread 39 to be threaded through the sewing needle 5, the slider 43 of the thread selection mechanism 40 is moved in the lateral direction of the head portion 3 via the screw feed mechanism or the like (see FIG. 2 in the direction indicated by arrow E in FIG. 2, so that any one of the yarn introduction nozzles 50 faces the yarn guide 54 above and below, for example, as shown in FIG. Arrange and select the thread. Then, the upper thread 39 (the upper thread 39 selected by the thread) whose thread end side is held in a standby state in the thread introduction nozzle 50 can be sandwiched between the thread feeding roller 52 and the guide roller 46 of the thread feeding mechanism 51. Lead to a bad condition.
[0098]
Next, in this state, the pressing cylinder 49 is reduced, the guide roller 46 is urged to be pressed against the yarn feed roller 52 by the spring 47 shown in FIG. 1, and the yarn guide 54 is moved to the raised position shown in FIG. The upper end side of the yarn guide 54 is temporarily fitted to the nozzle end 50 </ b> A of the yarn introduction nozzle 50. In this state, the yarn feed roller 52 is rotationally driven by the yarn feed motor 53 of the yarn feed mechanism 51 while air is circulated through the yarn introduction nozzle 50 selected for the yarn. The material is fed into the balance thread path 12 through the guide 54 or the like.
[0099]
Further, at this time, air is supplied / discharged from the supply / discharge nozzles of the balance yarn path forming unit 9 and the relay yarn path forming unit 15, so that a negative pressure or a positive pressure is generated in the balance yarn path 12 and the relay yarn path 20. The upper thread 39 having an edge-shaped thread end formed on the tip side is inserted into the thread hole of the balance 7 from the thread path section 12A of the balance thread path 12, and further the thread path section 12B is Through the straight thread path 20A and the curved thread path 20B of the relay thread path 20.
[0100]
In this case, when the upper thread 39 is guided along the balance thread path 12 and the relay thread path 20 by the air flow, the upper thread 39 tends to be guided at an excessively high speed. While the guide roller 46 is driven by the yarn feed roller 52, the upper yarn 39 is gradually fed toward the yarn introduction nozzle 50, and the moving speed of the upper yarn 39 in the balance yarn path 12 and the relay yarn path 20 is desired. Try to keep the speed down.
[0101]
When the thread end side of the upper thread 39 passes between the thread paths 12A and 12B of the balance thread path 12, the upper thread 39 is threaded into the thread hooking portion 84B of the thread separating lever 84 and the thread hole of the balance 7. The upper thread 39 is guided from the curved thread path portion 20B of the relay thread path 20 to the thread posture corrector 23.
[0102]
Further, on the yarn posture corrector 23 and the yarn suction device 26 side, air from the pressure source is ejected toward the downstream side of the nozzle-like yarn path through the air introduction port, and also in the yarn suction device 26, the yarn suction unit. Air is circulated from the 26A side toward the drawing portion 26B side, and a negative pressure is generated on the yarn suction portion 26A side by the air flow at this time. Then, the yarn posture corrector 23 linearly corrects the yarn posture of the upper yarn 39 by the air flow at this time, and the upper yarn 39 is inserted into the needle hole 5A of the sewing needle 5 in cooperation with the yarn suction device 26. Let
[0103]
On the yarn suction device 26 side, the upper thread 39 from the yarn posture corrector 23 is sucked into the yarn suction portion 26A through the needle hole 5A of the sewing needle 5 by the negative pressure generated in the yarn suction portion 26A. The tip end side of the upper thread 39 inserted through the needle hole 5A of the sewing needle 5 is guided to the position of the drawing portion 26B through the yarn suction portion 26A. Then, when the yarn end side of the upper thread 39 is pulled out from the drawing portion 26B of the yarn suction device 26, this is detected by the threading detector 27, thereby completing the automatic threading process.
[0104]
Next, when the threading to the sewing needle 5 is completed, the supply of air to the yarn introduction nozzle 50 is stopped and the balance thread path forming part 9, the relay thread path forming part 15, and the sewing needle thread path forming part The air supply over 22 is stopped. Then, the opening operation of the balance thread path 12 and the relay thread path 20 is performed by the actuators 14 and 21, and the nozzle-shaped thread path of the yarn posture corrector 23 is opened by the correction cylinder 25. The yarn guide 54 is preferably moved from the raised position shown in FIG. 10 to the lowered position shown in FIG. 11 so that it can be quickly dealt with when changing the yarn, which will be described later.
[0105]
At this time, by moving the swing bracket 30 of the advance / retreat mechanism 28 by the swing angle θ shown in FIG. 4, the thread path forming portion 22 for the sewing needle consisting of the yarn posture corrector 23 and the thread suction device 26 is moved. The relay thread path forming unit 15 is retracted from the threading position indicated by a solid line in FIG. 4 to the retracting position indicated by an imaginary line.
[0106]
As a result, the upper thread 39 introduced into the nozzle-like thread path of the balance thread path 12, the relay thread path 20, and the thread posture corrector 23 during threading through the sewing needle 5 is free from these thread paths 12, 20 and the like. Will be automatically withdrawn. Further, since the relay thread path forming portion 15 is retracted to the position indicated by the phantom line in FIG. 4 together with the sewing needle thread path forming portion 22, the relay thread path is formed from the periphery of the sewing needle 5 when embroidery work or the like is started. It is possible to widen the field of view around the sewing needle 5 by largely separating the portion 15 and the thread needle forming portion 22 for the sewing needle.
[0107]
Next, in this state, the yarn spreading lever 84 is lowered (swinged) downward along the arc-shaped lever guide hole 13A by the yarn spreading motor 85, and the yarn hooking portion 84B of the yarn spreading lever 84 is removed from the balance 7. Increase the distance in the direction of arrow A. Then, in a state where the balance thread path 12 of the balance thread path forming section 9 is opened, the thread hooking portion 84B of the yarn spreading lever 84 is largely separated from the balance 7, thereby making the curved balance thread path 12 or the like. The upper thread 39 in a slack state is pulled between the thread hole of the balance 7 and the thread hooking portion 84B of the thread separating lever 84, and the upper thread 39 is slackened prior to the subsequent embroidery work (sewing operation). Try to absorb.
[0108]
Next, in this state, the guide roller 46 is moved back to the non-operating position shown by the dotted line in FIG. 1 against the spring 47 by the pressing cylinder 49 so that the upper yarn 39 can be smoothly fed during the sewing operation. . In this case, after the threading is completed, after the upper thread 39 that has been threaded is clamped by the corresponding thread retainer or the like, the above-described thread path opening process, the backward movement of the guide roller 46, and The slack absorbing process of the upper thread 39 may be performed by the thread spreading lever 84, and thereafter the clamp by the thread retainer may be released.
[0109]
Next, when the sewing operation is started, the spindle motor and the frame moving mechanism of the embroidery frame are driven based on the embroidery data, and the sewing needle 5 is sequentially moved to create an embroidery pattern on the embroidery cloth. When the sewing needle 5 is operated, the upper thread 39 is completely detached from the balance thread path 12 and the relay thread path 20 and the like. An appropriate tension can be applied by the thread tension 36, etc., and low-friction yarn can be fed toward the sewing needle 5, and the upper thread 39 is applied to the balance thread path 12, the relay thread path 20, and the like during the operation of the sewing machine. It can be surely prevented from being caught.
[0110]
Next, when changing the thread or color of the upper thread 39 during the embroidery operation as described above, the needle movement operation of the sewing needle 5 is stopped, for example, on the lower side of the needle plate 6 (see FIG. 3). After the thread or upper thread 39 is forcibly trimmed, in order to remove the upper thread 39 from the needle hole 5A of the sewing needle 5 at this time, the cross bar 60 is indicated by a solid line in the direction of arrow F1 in FIG. Advance from the indicated position to the position indicated by the virtual line. In this case, the guide roller 46 is urged so as to be pressed against the yarn feed roller 52 by the spring 47 shown in FIG. 1, and the upper yarn 39 is held in advance above the yarn introduction nozzle 50. Is good.
[0111]
Then, as shown in FIG. 9, the crossbar 60 is advanced in the direction of arrow F1 so that the crossbar 60 crosses between the yarn removal prevention tool 74 and the yarn guide 54 of the yarn trimming device 71, and the yarn of the crossbar 60 is The upper thread 39 is pushed to the position of the thread sucker 69 by the cross bar 60 while the upper thread 39 is hooked on the hanging portion 60A, so that the upper thread 39 is pulled out from the needle hole 5A of the sewing needle 5. The upper thread 39 can be pulled up to the thread guide 54 side, and at this time, the upper thread 39 is surely detached from between the pinching blades 72 and 73 by the thread detachment prevention tool 74 provided in the thread trimming device 71. Can be prevented.
[0112]
Thus, the upper thread 39 can be reliably cut between the pinching blades 72 and 73 of the thread trimming device 71 in a state where the upper thread 39 is pulled by the cross bar 60 between the thread detachment prevention tool 74 and the thread guide 54. In addition, the yarn end shaping of the upper thread 39 can be performed simultaneously. Further, the portion of the upper thread 39 (the old thread before thread change) that is cut off from the thread introduction nozzle 50 side between the pinching blades 72 and 73 of the thread trimming device 71 and remains on the thread guide 54 side is threaded by the cross bar 60. By being pushed in the direction of the arrow F1 toward the position of the sucker 69, the tip end side is reliably pulled out from the needle hole 5A of the sewing needle 5, and air is sucked by the operation of the yarn sucker 69. For example, it is removed by suction to the outside of the sewing machine body 1.
[0113]
Further, the upper yarn 39 in a state in which the yarn end extends slightly downward from the nozzle end 50A of the yarn introduction nozzle 50 and the yarn end is shaped is housed in the yarn introduction nozzle 50 in the same manner as in the preparation operation described above. For this purpose, the yarn feed roller 52 is temporarily reversed, and the yarn end side of the upper yarn 39 is once fed back into the yarn introduction nozzle 50 via the guide roller 46. Then, the yarn end of the upper thread 39 is prevented from being defibrated or frayed by the next threading operation.
[0114]
Further, in this state, the next upper thread 39 for thread change (color change) is selected by the thread selection mechanism 40, and the selected upper thread 39 is introduced from the leading end side through the guide roller 46 by the thread feed roller 52. It sends out to the nozzle 50 side. At this time, the yarn guide 54 is moved in advance to the raised position shown in FIG. 10, and its upper end side is fitted to the nozzle end 50 </ b> A of the yarn introduction nozzle 50. In this state, by continuing the yarn feeding of the upper yarn 39 by the yarn feeding roller 52, the tip side of the upper yarn 39 is used for the balance, for example, from the nozzle end 50A side of the yarn introduction nozzle 50 through the yarn guide 54. The yarn is introduced toward the yarn path 12 and the automatic threading operation is performed in the same manner as described above.
[0115]
On the other hand, even when the thread breakage occurs during the driving of the sewing needle 5, etc., the crossbar 60 is directed in the direction of arrow F1 toward the position of the yarn sucker 69 as shown in FIG. The thread trimming device 71 is operated in the advanced state, and the upper thread 39 remaining on the balance 7 side, for example, is sucked and removed to the outside by the thread sucker 69. In this case, the upper yarn 39 whose yarn ends are shaped by the pinching blades 72 and 73 of the yarn trimming device 71 is sent out to the yarn introduction nozzle 50 side by the yarn feeding roller 52 via the guide roller 46, and the yarn guide. The automatic threading process is performed in the same manner as described above while being introduced on the 54 side.
[0116]
Further, when a yarn cost consumption state occurs in which the upper thread 39 being used is completely consumed during the sewing operation, this is detected by, for example, the yarn cost consumption sensor provided in each yarn guide portion 38 of the tension base 35, In this case, in order to automatically thread the upper thread 39 of the same type stored in each cheese case through the sewing needle 5, thread processing is performed in the same manner as in the operation preparation operation described above. When the same thread (color, color type, etc.) is preset in another thread number, an automatic thread changing process can be executed.
[0117]
Thus, according to this embodiment, any one of the plurality of upper threads 39, 39,... Can be selectively inserted into the needle hole 5A of the sewing needle 5 provided in the head portion 3, Threading can be automated, and there is no need to provide a needle selection mechanism or the like as in the prior art on the head unit 3 side, the structure of the head unit 3 can be simplified and the entire size can be reduced, and the needle hole 5A of the sewing needle 5 can be reduced. Thus, the upper thread 39 can be smoothly guided.
[0118]
In this case, at the preparatory stage of the automatic threading operation, the upper thread 39 is fed by the thread feeding roller 52, and the leading end side of the upper thread 39 is directed from the nozzle end 50A side of the thread introducing nozzle 50 into the thread guide 54. In this state, the cross bar 60 is advanced in the direction of arrow F1 in FIG. 9 so as to cross between the thread guide 54 and the thread detachment preventing tool 74, whereby the upper thread 39 Is pushed from the position of the insertion hole 74A of the thread detachment prevention tool 74 to the position of the thread sucker 69.
[0119]
As a result, the thread trimming device 71 is operated in a state where a certain tensile force is applied to the upper thread 39, and the upper thread 39 can be reliably cut between the pinching blades 72 and 73, and from the nozzle end 50A of the thread introducing nozzle 50. The cut end portion of the upper thread 39 protruding downward can be formed in an edge shape, and the upper end 39 can be easily shaped. Further, the yarn sucker 69 sucks the remaining upper yarn 39 portion which is pushed out in the direction of arrow F1 by the cross bar 60 and cut off between the pinching blades 72 and 73 from the yarn introduction nozzle 50 side. It can be reliably recovered.
[0120]
In this state, the yarn feed roller 52 is rotated by the yarn feed motor 53 of the yarn feed mechanism 51 while air is circulated through the yarn introduction nozzle 50 selected for the yarn, and the leading end side of the upper yarn 39 is set to the yarn guide 54. Are fed into the balance thread path 12 and the air is supplied / discharged from the supply / discharge nozzles of the balance thread path forming unit 9 and the relay thread path forming unit 15, so that the balance thread path 12 and An air flow by negative pressure or positive pressure is generated in the relay yarn path 20, and an upper thread 39 having an edge-like thread end formed on the tip side is inserted into the thread hole of the balance 7, The upper thread 39 can be smoothly and stably inserted from the yarn end side into the needle hole 5A of the sewing needle 5 with the thread suction device 26.
[0121]
Further, a threading detector 27 for detecting whether or not the upper thread 39 has been inserted into the sewing needle 5 is provided on the drawing portion 26B side of the thread suction device 26, and the sewing needle is based on a signal from the threading detector 27. After the threading to 5, the actuators 14, 21, etc. are automatically operated to open the balance thread path 12, the relay thread path 20, etc., and the swing bracket 30 of the advance / retreat mechanism 28 is shown in FIG. 4. 4 is moved from the threading position indicated by a solid line in FIG. 4 together with the relay thread path forming unit 15 by moving the thread posture correcting unit 23 and the thread suction unit 26. It can be retreated to a retreat position indicated by a virtual line.
[0122]
As a result, after threading through the sewing needle 5, the balance thread path 12, the relay thread path 20, and the upper thread 39 guided into the nozzle-shaped thread path of the thread posture corrector 23 are transferred to the thread paths 12, 20 and the like. Can be automatically released as a free state. The field of view around the sewing needle 5 can be widened by largely retracting the relay yarn path forming portion 15 and the sewing needle thread path forming portion 22 from the periphery of the sewing needle 5, for example, at the time of embroidery work. It is possible to prevent the forming portion 15 and the thread needle forming portion 22 for the sewing needle from interfering with each other, and the entire operation can be performed safely and smoothly.
[0123]
Further, the yarn threading portion 84B of the yarn spreading lever 84 is largely separated from the balance 7 with the balance yarn passage 12 of the balance yarn passage forming portion 9 opened, so that the curved yarn passage 12 having a curved shape or the like is obtained. The upper thread 39 that is in a slack state along the thread can be pulled between the thread hole of the balance 7 and the thread hooking portion 84B of the thread separating lever 84 to automatically absorb the slack of the upper thread 39 prior to the embroidery operation. In this state, the upper thread 39 can be smoothly supplied to the sewing needle 5 by performing the sewing operation.
[0124]
Further, when changing the thread or color of the upper thread 39 during the embroidery operation, the cross bar 60 is moved so as to cross between the thread detachment preventing tool 74 and the thread guide 54 of the thread trimming device 71 in FIG. Since the upper thread 39 is advanced to the direction indicated by the arrow F1 and pushed by the cross bar 60 to the position of the thread sucker 69, the upper thread is threaded by the cross bar 60 between the thread detachment prevention tool 74 and the thread guide 54. The upper thread 39 can be surely cut between the pinching blades 72 and 73 of the thread trimming device 71 in a state in which the upper thread 39 is pulled. At this time, the upper end of the upper thread 39 can be shaped simultaneously.
[0125]
Then, the upper end 39 of the upper thread 39 (the old thread before thread change) remaining on the thread guide 54 side at this time is pushed toward the position of the thread sucker 69 by the cross bar 60, thereby The thread 39 can be reliably pulled out from the needle hole 5A of the sewing needle 5, and can be removed to the outside by air suction of the thread sucker 69, so that the old thread can be collected easily.
[0126]
Further, in a state where the upper thread 39 is pushed to the position of the thread sucker 69 as shown in FIG. 9 by the cross bar 60, the thread sucker 69 is operated to apply a suction force to the upper thread 39, and the thread trimming device 71 is operated. The upper thread 39 may be cut by the sandwiching blades 72, 73. In this case, the upper thread 39 can be reliably cut by the thread trimming device 71 in a state where a large tension is applied to the upper thread 39, and the upper thread 39 The yarn end shaping of 39 can be performed more effectively.
[0127]
Further, with respect to the upper thread 39 that has been subjected to thread trimming by the thread trimming device 71, the thread feeding mechanism 51 feeds the yarn while the thread end side slightly extending downward from the nozzle end 50A of the thread introducing nozzle 50 is shaped. By temporarily reversing the roller 52, the yarn end side of the upper yarn 39 is fed back into the yarn introduction nozzle 50 through the guide roller 46, and the yarn end side of the upper yarn 39 is moved into the yarn introduction nozzle 50. Thus, it is possible to reliably prevent the yarn end of the upper thread 39 from being defibrated or frayed by the next threading operation.
[0128]
Further, since a tension base 35 is provided on the head portion 3 of the sewing machine body 1 and each thread tension 36 and the like are provided on the tension base 35 side, the balance thread path 12 formed by the balance thread path forming portion 9 is provided. There is no need to provide a separate thread tension or the like on the way, and the shape of the balance thread path 12 by the balance thread path forming portion 9 can be greatly simplified, and the air flow from the supply / discharge nozzle on the balance thread path 12 Thus, the upper thread 39 can be guided very smoothly along the balance thread path 12.
[0129]
In the above embodiment, after automatic threading with respect to the sewing needle 5, the thread separating lever 84 is largely swung downward along the lever guide hole 13A by the thread separating motor 85, and prior to the subsequent sewing operation, the upper thread is moved. However, the present invention is not limited to this. For example, the swing position when the yarn spreading lever 84 is swung downward by the yarn spreading motor 85 is variably adjusted. It may be.
[0130]
In actual sewing operation, the thread separating lever 84 can be given a thread tension function by changing the swing position of the thread separating lever 84 for each stitch with a stroke amount of, for example, about 5 to 10 mm. Further, when the embroidery pattern has a swing width such as a satin pattern, an appropriate tension is applied to the upper thread 39 or the like by adjusting the swing position of the thread spreading lever 84 in proportion to the swing width, for example. Can do.
[0131]
In the above embodiment, it is assumed that the upper thread 39 is automatically pulled out from the thread suction portion 26A of the thread suction device 26 after threading through the sewing needle 5, and the thread suction device 26 is a 2 The case where the split structure is not employed has been described as an example, but instead, for example, in the case where a thread gripper or the like is provided on the threading detector 27 side, the thread suction device 26 has a two-split structure. Is good.
[0132]
Furthermore, in the above-described embodiment, the case where the automatic threading device is applied to a single-head embroidery machine has been described as an example. However, the present invention is not limited to this, and for example, a multi-head embroidery machine or a normal sewing machine is used. It may be applied to an industrial sewing machine or the like.
[0133]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, any one of the plurality of threads stored in the thread storing means is selectively selected by the thread insertion means with respect to the head side balance and the sewing needle. When the thread inserted through the sewing needle is replaced, the thread cutting means is operated in this state while pushing the thread pushing means in the direction of removing the thread from the sewing needle. Since the thread is cut from the middle part and the thread remaining on the thread pushing means side is removed to the outside by the thread removing means, one of a plurality of threads is selected with respect to the sewing needle provided in the head portion. The entire head portion can be reduced in size, and the old thread can be reliably extracted and collected from the sewing needle when changing the thread, and then the new thread can be automatically threaded through the sewing needle.
[0134]
According to a second aspect of the present invention, the yarn insertion means includes a yarn path forming mechanism, a yarn guide mechanism, a yarn selection mechanism, a yarn feeding mechanism, and a yarn guiding mechanism, and the yarn cutting means is connected to one end side of the yarn path. The yarn guide mechanism is arranged between the yarn feed mechanism and the shape of the yarn end is adjusted by cutting the tip end side of the yarn fed by the yarn feed mechanism. Accordingly, one of the yarns can be selected by the yarn selection mechanism while being individually guided toward the yarn path of the yarn path forming mechanism, and the selected yarn is sent out toward the yarn path by the yarn feeding mechanism. In this state, by operating the yarn guiding mechanism and allowing gas to flow through the yarn path, the yarn can be smoothly guided along the yarn path, and the yarn can be reliably guided to the sewing needle from the yarn end side. Can be inserted.
[0135]
The yarn cutting means provided between the one end side of the yarn path and the yarn feeding mechanism adjusts the shape of the yarn end by cutting the leading end side of the yarn that is selected in advance and sent out by the yarn feeding mechanism. In this case as well, the tip of the yarn to be cut can be pushed toward the yarn removing means by the yarn pushing means, and after the yarn is cut, the tip of the yarn remaining on the yarn pushing means side The side portion can be removed to the outside by the yarn removing means. Further, in this state, while the yarn is fed by the yarn feeding mechanism, a gas such as air is circulated in the yarn path by the yarn guiding mechanism, whereby the yarn with the adjusted yarn end is fed to the needle hole of the sewing needle. Can be reliably guided, and automatic threading can be performed stably.
[0136]
In the invention of claim 3, since the thread cutting means is constituted by a pair of sandwiching blades, a blade drive mechanism and a thread detachment preventing tool, each sandwiching blade is threaded when the sandwiching blade is opened and closed by the blade drive mechanism. Against Straight The yarns can be opened and closed in a crossing direction, and the yarn can be reliably cut, and the yarn detachment prevention tool can prevent the yarn from coming off between the pinching blades, so that the yarn cutting with the pinching blades can be executed stably.
[0137]
Furthermore, in the invention of claim 4, since the thread pushing means is constituted by a thread guide, a cross bar and a bar driving mechanism, the thread guide and the thread are crossed by a bar driving means. When advancing toward the thread removing means side so as to cross between the detachment prevention tool, the thread can be pushed in the advancing direction of the crossbar in a state where the thread is hooked on the thread hooking portion of the crossbar, for example, The thread can be pulled up in the direction of the crossbar so as to remove the thread from the needle hole of the sewing needle. Then, by cutting the yarn in this state, it is possible to reliably remove the yarn portion (for example, the old yarn before changing the yarn) on the tip side from the cutting portion to the outside.
[0138]
According to a fifth aspect of the present invention, a yarn introduction nozzle is provided between the yarn feed mechanism and each pinching blade of the yarn cutting means, and the yarn guide is moved up and down by the yarn guide lifting mechanism to the lowered position and the raised position. Therefore, the gas fed from the yarn feed mechanism can be stably introduced into the guide hole of the yarn guide by circulating the gas through the yarn introduction nozzle while holding the yarn guide in the raised position. The yarn can be reliably guided to one end side of the yarn path via a yarn guide. After the introduction of the yarn to the yarn path side, the yarn guide is lowered to the lower side of the cross bar, for example, between the yarn guide and the yarn detachment preventing tool when changing the yarn or when a yarn breakage occurs. Thus, the cross bar can be advanced toward the yarn removing means, and the shaping of the yarn end, the removal operation of the old yarn, and the like can be performed stably.
[0139]
On the other hand, in the invention of claim 6, since the yarn removing means is constituted by the yarn sucker that sucks and removes the tip side portion of the yarn cut by the yarn cutting means, for example, at the time of changing the yarn or occurrence of yarn breakage While cutting the yarn while the yarn is pushed by the yarn pushing means toward the yarn sucker side, the tip side portion of the cut yarn can be reliably sucked and removed by the yarn sucker. Yarn can be collected effectively.
[0140]
According to a seventh aspect of the present invention, the yarn path forming mechanism includes a balance thread path forming part, a sewing needle thread path forming part, and a relay thread path forming part, and the thread is passed through the sewing needle after threading. Since the relay yarn path forming portion is retracted in a direction away from the sewing needle together with the thread needle forming portion for the sewing needle with the path open, for example, when starting the sewing work, the field of view around the sewing needle can be widened. Thus, the relay yarn path forming portion and the sewing needle needle thread forming portion can be prevented from interfering with the sewing work, whereby the entire work can be carried out safely and smoothly.
[Brief description of the drawings]
FIG. 1 is a partially broken front view showing an automatic threading device and the like provided in an embroidery machine according to an embodiment of the present invention.
2 is a partially broken left side view showing the embroidery machine, automatic threading device, and the like in FIG. 1. FIG.
3 is an enlarged view showing a head portion, a yarn path forming mechanism and the like in FIG. 2. FIG.
4 is an enlarged view showing a yarn path forming mechanism and the like in FIG. 1. FIG.
5 is a left side view showing an advance / retreat mechanism and the like in FIG. 3. FIG.
6 is a partially broken front view showing, in an enlarged manner, a balance thread passage forming portion, a yarn introduction nozzle, a yarn guide, and the like in FIG. 1. FIG.
7 is a partially broken left side view showing the balance thread path forming portion, the yarn introduction nozzle, the yarn guide, and the like in FIG. 6. FIG.
FIG. 8 is a cross-sectional view taken from the direction of arrows VIII-VIII in FIG.
9 is an enlarged cross-sectional view taken from the direction of arrows IX-IX in FIG.
10 is a partial cross-sectional view showing a state in which the yarn guide in FIG. 6 is arranged at the raised position.
11 is a partial cross-sectional view of the same position as FIG. 10 showing a state in which the yarn guide is disposed at the lowered position.
12 is a partially enlarged view of FIG. 8 showing a crossbar, a thread trimming device, and the like.
13 is a partially broken plan view showing the thread trimming device in FIG. 12 in an enlarged manner.
14 is an operation explanatory view showing a rack, a pinion, and a crank gear in FIG. 13. FIG.
[Explanation of symbols]
1 Sewing machine
2 base
3 Head
5 Sewing needle
7 Balance
8 Yarn path formation mechanism
9 Yarn forming section for balance
12 Yarn for balance
14, 21 Actuator
15 Relay Yarn Forming Section
16 Bearing part
20 Relay Yarn
22 Yarn path forming part for sewing needle
23 Yarn posture corrector
26 Thread suction machine
27 Threading detector
28 Advance / Retreat Mechanism
30 Swing bracket
34 Support plate
35 tension stand
36 Thread tension
38 Thread guide (Thread guide mechanism)
39 Upper thread (thread)
40 Thread selection mechanism
43 Slider
46 Guide roller
49 Pushing cylinder
50 Yarn introduction nozzle
51 Yarn feed mechanism
52 Yarn feed roller
53 Yarn feed motor
54 Thread guide
55 Yarn guide lifting mechanism
56 Lifting cylinder
60 Crossbar (thread pushing means)
61 Bar drive mechanism
69 Thread Absorber (Thread Remover)
71 Thread trimming device (thread cutting means)
72, 73 pinching blade
74 Thread removal prevention device
76 Blade drive mechanism
84 Thread separation lever
85 Thread separation motor

Claims (7)

A sewing machine main body, a head part provided on the sewing machine body for reciprocating the sewing machine needle and swinging the balance, and a thread for storing a plurality of threads for supplying the yarn to the balance and the sewing machine needle of the head part Storage means, thread insertion means for selectively inserting the thread from the thread storage means into the balance and the sewing needle, and pushing the thread in a direction to remove the thread from the sewing needle at least when changing the thread A thread pushing means, a thread cutting means for cutting the thread from a halfway position in a state where the thread is pushed by the thread pushing means, and a thread cutting means side of the yarn cut by the thread cutting means. A sewing machine comprising yarn removing means for removing the remaining yarn to the outside. The thread insertion means includes a thread path forming mechanism that is provided in the head portion and forms a thread path for threading at least the balance and a sewing needle, and a plurality of threads stored in the thread storage means. A yarn guide mechanism for individually guiding the yarn path toward one end of the yarn path by the forming mechanism, a yarn selection mechanism for selecting any one of the plurality of yarns guided by the yarn guide mechanism, A yarn feed mechanism that feeds the yarn selected by the yarn selection mechanism toward one end of the yarn path, and guides the yarn toward the other end of the yarn path by causing gas to flow through the yarn path. A yarn guiding mechanism that is inserted into the sewing needle from the yarn end side, and the yarn cutting means is provided between one end side of the yarn path and the yarn feeding mechanism, so that the yarn fed by the yarn feeding mechanism is Claims that are configured to cut the tip side and adjust the shape of the yarn end Sewing machine according to 1. The yarn cutting means, a pair of scissors blades which is opened and closed in a straight direction orthogonal to respect the yarn, a blade drive mechanism for opening and closing the respective scissors blade, and one end side of the yarn path by the yarn forming mechanism The sewing machine according to claim 2, further comprising: a thread detachment prevention tool that is positioned between each of the nip blades and is fixed to the blade drive mechanism side to prevent the yarn from coming off between the nip blades. The yarn pushing means is disposed between one end side of the yarn path formed by the yarn path forming mechanism and the yarn detachment preventing tool, and a yarn guide having a guide hole for guiding the yarn into the yarn path; A cross bar which is advanced and retracted so as to cross between the yarn guide and the yarn detachment prevention tool and the tip side becomes a yarn hooking portion, and the yarn hooking portion of the cross bar is normally held at a position retracted from the yarn guide. At least at the time of the thread change, a bar driving mechanism that advances the cross bar from between the yarn guide and the yarn detachment preventing device toward the yarn removing means with the yarn hooked on the yarn hooking portion of the cross bar. The sewing machine according to claim 3, comprising: Between the thread feeding mechanism and each pinching blade of the thread cutting means, a thread introduction nozzle for introducing the thread fed by the thread feeding mechanism into the guide hole of the thread guide by gas flow. The yarn guide has a lowered position in which the upper end side of the guide hole of the yarn guide is below the cross bar, and the upper end side of the guide hole is located between the yarn removal prevention tool and each pinching blade. 5. The sewing machine according to claim 4, wherein a thread guide raising / lowering mechanism is provided for raising and lowering the yarn guide up and down between a raised position fitted to a lower end side of the introduction nozzle. The sewing machine according to claim 1, 2, 3, 4, or 5, wherein the yarn removing means is constituted by a yarn sucker that sucks and removes the tip side portion of the yarn cut by the yarn cutting means. The thread path forming mechanism includes a thread path forming part for a balance that forms a thread path extending in a curved line or a straight line before and after the balance so as to pass a thread through the balance, and a needle hole of the sewing needle. A thread path forming part for a sewing needle that forms a thread path that extends linearly before and after the sewing needle for inserting the thread, the thread path forming part for the sewing needle, and the thread path forming part for the balance. A relay yarn path forming portion that is disposed between the yarn paths and relays between the yarn paths. The relay yarn path formation portion opens the thread path after threading through the sewing needle. The sewing machine according to claim 2, 3, 4, 5 or 6, wherein the sewing machine is configured to retract together with the yarn path forming portion in a direction away from the sewing needle.

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