CN1786315A - Sewing machine - Google Patents

Abstract

A sewing machine, the sewing machine (10) has: a main body frame (20) which is placed on the top of a workbench (1) and supports and stores its roughly integral structure; holds the needle (11) and can be moved up and down by the main body frame The needle bar supported by the frame (20); the up and down movement mechanism for moving the needle bar up and down driven by the sewing machine motor (3); Cloth mechanism; a cloth pressing mechanism (12) that presses the object to be sewn on the needle plate (13) from above; a cloth thickness detection mechanism (30) that detects the thickness of the object to be sewn on the needle plate (13); A thread loosening mechanism (40) used as an operating mechanism for loosening the thread according to the detection thickness detected by the cloth thickness detection mechanism (30); an action control mechanism (80) for controlling the action of the above-mentioned components. With the sewing machine having the above constitution, thread loosening can be performed more freely.

Description

sewing machine

technical field

The present invention relates to a sewing machine capable of pulling out rich sutures during sewing.

Background technique

When the sewing machine sews, in order to form a uniform seam, a pressing force is applied by a generally flat presser foot near the sewing position of the sewn object conveyed by the cloth feeding mechanism, that is, the needle dropping position. Therefore, the sewing position of the object to be sewn is compressed by receiving this pressing force. Also, the compressed portion that moves from the position of the presser foot in the conveyance direction as the conveyance progresses is released from the pressing force of the presser foot, and returns to its original thickness due to the rebound force (restoration force).

In addition, on the above-mentioned compressed part, the needle threaded with the upper thread is passed through from the upper side, and when the lower side of the needle plate is placed, the lower thread is hung on the upper thread passed on the needle point and the needle point is sewn from the needle point. When the lower side of the object is pulled out toward the upper side, sewing (stitch formation) is performed by fastening the upper and lower threads.

Here, when sewing multiple layers of objects to be sewn, for example, when sewing sleeves and front and back of a shirt, etc., the stitches formed on the shoulder pads are preferable in terms of the quality of the finished product. part, the thickness of the original shoulder pad can be maintained even after sewing. Generally speaking, in a sewing machine, since stitches are formed on the compressed part compressed by the presser foot, the material to be sewn has softness like a shoulder pad, and the original thickness and the thickness when pressed by the presser foot are relatively large. Differently, when such a to-be-sewn object is sewn, there is a problem that the thickness of the seam portion after sewing is greatly thinner and dented compared with the original thickness of the to-be-sewn object.

In view of the above-mentioned problems, there is known a sewing machine with a function that, on the upper side of the needle plate, a control lever that swings left and right traverses the needle track of a machine needle that is driven up and down, so that the upper thread can be pre-wound and the sewing machine can be sewed. The wire length after manufacturing has a margin (for example, refer to Non-Patent Document 1). In such a conventional sewing machine, the control lever is configured to have a cloth thickness detection mechanism capable of moving up and down according to the cloth thickness via a link mechanism. Thereby, a certain amount of abundant upper thread can be ensured according to the change of the thickness of the cloth during sewing, and the difference between the thickness of the seam portion after sewing and the original thickness of the object to be sewn can be alleviated.

Non-Patent Document 1: Sewing Machine, D697 パツツブツク, manufactured by Duru Cosup Co., Ltd.

However, in the conventional sewing machine described in the above-mentioned non-patent document 1, since the cloth thickness detection mechanism for detecting the original cloth thickness is constituted as having a rod connected by a long hole and a pin engaged with the long hole, , but the amount of up and down of the control rod can be adjusted at a certain ratio for the change in thickness of the fabric. In other words, only a linear (one-time) change can be made with respect to the amount of change in the thickness of the cloth, and the response to the change in the thickness of the cloth is only an approximate amount based on the original thickness of the cloth. In addition, since the ratio adjustment is performed manually, it cannot be performed during sewing, so there is a problem that sewing must be performed at a constant ratio.

Moreover, the length of the rich suture is only customized based on the original thickness of the cloth detected by the cloth thickness detection mechanism. When sewing objects with different elastic and restoring forces, it is necessary to The long holes and pins are adjusted again. Since the adjustment of the pins engaged with the elongated holes is performed manually by the operator, it is troublesome and difficult to fine-tune, and the reproducibility is low when sewing objects of the same material.

In addition, the shaking action of the control lever in the left and right directions can be switched between running and stopping, and the shaking range in the left and right directions cannot be adjusted according to the thickness of the fabric or the recovery amount. That is, there is a problem that it is impossible to adjust the ensured amount of the upper thread corresponding to the thickness of the cloth by the movement in the left and right directions.

Furthermore, the swinging action of the control lever in the left and right direction transmits the rotation of the main shaft of the sewing machine through the gear, and transmits the rotational speed by half. Therefore, the needle that is driven up and down synchronously with the main shaft of the sewing machine reciprocates twice up and down, and the lever reciprocates left and right once. Therefore, with respect to the drive mode of the control lever in the left and right directions, it is possible to perform an operation in which the control lever traverses the lower side every time the needle is raised, and the operation mode cannot be changed.

Contents of the invention

An object of the present invention is to provide a sewing machine capable of more freely loosening the thread.

In order to solve the above-mentioned problems, the sewing machine described in claim 1 is characterized in that it has:

A needle driving mechanism that drives the needle up and down; a cloth feeding mechanism that synchronizes with the needle driving mechanism to convey the object to be sewn on the needle plate; a cloth pressing mechanism that presses the object to be sewn on the needle plate A thread loosening mechanism, which has a thread loosening part, and the thread loosening part is arranged along the cloth feeding direction, and crosses the up and down motion path of the machine needle in a direction intersecting with the cloth feeding direction, thereby winding and hanging on the machine needle and the suture between the sewn object and pull out the thread length with allowance;

The thread loosening mechanism has a cross direction driving mechanism, and the cross direction driving mechanism drives the thread loosening in such a way that each needle traverses the up and down movement path of the machine needle in a direction crossing the cloth feeding direction. part,

It also has a control mechanism that can control the driving frequency or driving amount of the cross direction driving mechanism.

In the invention described in claim 1, the thread loosening member of the thread loosening mechanism is driven by a cross direction drive mechanism whose drive frequency, drive amount, drive speed, etc. are controlled by the control means. That is, the thread loosening part of the thread loosening mechanism can freely set or change the driving frequency, driving amount or driving speed in the direction intersecting with the up and down movement of the machine needle through the control mechanism, and according to the setting of the control mechanism, through Drive the mechanism in the cross direction to drive in the left and right directions.

The invention described in claim 2 is based on the sewing machine described in claim 1, wherein the thread loosening mechanism has a vertical drive mechanism capable of driving the thread loosening member in the vertical direction, and a detection mechanism is provided by the thread loosening mechanism. The thickness detecting means of the thickness of the sewing object conveyed by the cloth feeding means, and the control means has a function of controlling the vertical driving means based on the thickness detected by the thickness detecting means.

In the invention described in claim 2, the detection means detects the thickness of the to-be-sewn object conveyed to the sewing position by the cloth feed means. In addition, the thread loosening member of the thread loosening mechanism moves up and down by the vertical driving mechanism. In addition, the vertical drive mechanism is driven and controlled by the control mechanism based on the detection value detected by the thickness detection mechanism, that is, the original thickness of the object to be sewn. That is, output the original thickness of the sewn object detected by the thickness detection mechanism to the control mechanism, store it in the control mechanism, or calculate the lifting amount of the loosening member according to the setting in the control mechanism, and drive it up and down. The mechanism performs real-time feedback so that sewing can be performed by accurately pulling out the length of suture thread that ensures a margin for each stitch.

The invention described in claim 3 is based on the sewing machine described in claim 2, wherein the control means has a function of controlling the cross direction drive means based on the detection value of the thickness detection means.

In the invention described in claim 3, the driving mechanism of the crossing direction of the thread loosening mechanism is controlled by the control mechanism, and the control mechanism controls the crossing direction based on the original thickness of the sewing object detected by the thickness detection mechanism. direction drive mechanism. That is, the original thickness of the to-be-sewn object conveyed by the cloth feed mechanism is detected by the thickness detection means, and the detected value is output to the control means. Based on the detection value, the control mechanism drives or controls the cross direction drive mechanism in addition to the vertical drive mechanism.

(invention effect)

According to the invention described in claim 1, the thread loosening member of the thread loosening mechanism can be driven by the cross direction driving mechanism, and the cross direction driving mechanism can freely set or change the driving frequency, driving amount or drive speed etc. Therefore, compared with the conventional sewing machine having the thread loosening member driven by the driving force obtained from the sewing machine motor, the driving frequency or driving amount of the thread loosening member to the left and right directions can be freely set, and, Control to change the drive frequency or drive amount can also be performed during sewing. Thereby, in the sewing operation of each stitch (1 pitch), the thread length drawn out with a margin can be set to a desired value and can be changed as desired. Therefore, it is possible to perform various sewing according to the thickness and material of various sewing objects.

According to the invention described in claim 2, in addition to obtaining the same effect as the invention described in claim 1, in particular, the thread release member of the thread release mechanism can be sewn based on the detection of the thickness detection mechanism by the control mechanism. The original thickness of the object to control its drive. Therefore, compared with the conventional sewing machine which changes the lift amount at a constant rate by having a detection arm connected via a long hole and a pin, the lift amount in the vertical direction can be freely set or changed. Thus, in the sewing operation of each stitch (1 pitch), it is possible to set the length of the suture with a margin (slack) extremely finely, and it is possible to maintain the sewing object even after sewing. The sewing of the original thickness. And, because the up and down driving mechanism controls its drive through the control mechanism, the control mechanism performs the control of the up and down driving mechanism based on the detection thickness detected by the thickness detection mechanism, so it can be fed back in real time to be transported to the sewing position. According to the original thickness of the object to be sewn, it is possible to pull out a suture with a margin length corresponding to the original thickness of the object to be sewn correctly for each stitch.

According to the invention described in claim 3, in addition to obtaining the same effect as the invention described in claim 2, in particular, the control mechanism has a driving mechanism for controlling the cross direction based on the thickness of the object to be sewn detected by the thickness detection mechanism. The driving function, so that the original thickness of the sewing object conveyed by the cloth feeding mechanism can be fed back in real time, and it can be correctly ensured that each stitch pulled out has a surplus suture length. In addition, since the original thickness of the object to be sewn detected by the thickness detection mechanism can be used to control the movement of the cross direction drive mechanism in addition to the vertical drive mechanism, it is possible to accurately correspond to the The original thickness of the object to be sewn at the position, the driving frequency, driving amount and driving speed of these vertical driving mechanisms and cross direction driving mechanisms can be combined arbitrarily, and stitches can be formed according to various sewing conditions or sewing patterns.

Description of drawings

Fig. 1 is a perspective view showing the configuration of main parts of a sewing machine 10 according to the present embodiment.

FIG. 2 is an enlarged perspective view showing the configuration around the presser foot 12 of the present embodiment.

FIG. 3 is a block diagram showing the configuration of the motion control unit 80 of the present embodiment.

Fig. 4 is an operation explanatory diagram for explaining the sewing operation of the present embodiment.

FIG. 5 is a flowchart showing the control operation of the operation control means 80 in this embodiment.

In the figure: 3-sewing machine motor, 10-sewing machine, 11-needle, 12-presser foot, 13-needle plate, 20-main frame, 30-cloth thickness detection mechanism, 31-detection arm, 32-potentiometer , 40-thread loosening mechanism, 41-thread loosening parts, 45-left and right driving motor (left and right driving mechanism), 52-up and down driving motor (up and down driving mechanism), 80-action control mechanism (control mechanism), 90-operation panel ( input agency).

Detailed ways

Embodiments of the present invention will be described based on FIGS. 1 to 5 . FIG. 1 is a perspective view showing the configuration of a main part of a sewing machine 10. As shown in FIG.

Here, the following definitions are made. The direction in which the needle 11 described later moves up and down is referred to as the Z-axis direction (up-and-down direction), and one direction perpendicular thereto (the conveying direction of the object to be sewn) is referred to as the X-axis direction. (front-back direction), the direction perpendicular to both of the X-axis direction and the Z-axis direction is referred to as the Y-axis direction (left-right direction). In addition, in the sewing machine 10, the needle plate 13 provided on the upper side of the sewing machine bottom plate portion 21 is arranged parallel to the X-Y plane.

The sewing machine 10 of this embodiment is a sewing machine for sewing thick materials such as shoulder pads as a material to be sewn, and is suitable for sewing thicker materials than usual. In the following description, when simply referred to as a "sewn object", it means a sewn object in a state where cloth and shoulder pads are overlapped.

The sewing machine 10 has: a main body frame 20 supporting and storing its substantially integral structure; a needle bar supported by the main body frame 20 to hold the needle 11 and to move up and down; to move the needle bar up and down as driven by the sewing machine motor 3 The up and down movement mechanism of the needle drive mechanism; the cloth feeding mechanism that transports the sewn object placed on the needle plate 13 along the X-axis direction; presses the sewn object on the needle plate 13 from above to form a press cloth The presser foot 12 of the mechanism; the cloth thickness detection mechanism 30 that detects the thickness of the object to be sewn on the needle plate 13; Thread loosening mechanism 40; motion control mechanism 80 for motion control of the above-mentioned components.

(main frame)

The main body frame 20 includes a sewing machine floor portion 21 provided with a needle plate 13 on one end thereof, a vertical body portion 22 erected from the other end side of the sewing machine floor portion 21 , and a vertical body portion 22 extending from the upper end of the vertical body portion 22 The sewing machine head 23 extending in the same direction as the sewing machine bottom plate 21 and the main body frame 20 are formed in a substantially U-shape as a whole.

(needle)

The above-mentioned machine needle 11 is reciprocally driven in the Z-axis direction by a vertical movement mechanism through a needle bar (not shown) supported on the main body frame. The needle 11 wears the upper thread not shown near its front end, and penetrates the sewing object on the needle plate 13 through the reciprocating motion in the Z-axis direction, and sends the upper thread to the lower side of the needle plate 13, and The upper thread is wound around the bobbin thread wound on a hook (not shown) to sew.

(up and down movement mechanism)

The up and down motion mechanism (not shown) is fixed on the main body frame, and is equipped with: upper and lower metal bearings that respectively slidably support the upper and lower ends of the needle bar; A rotating upper shaft; a sewing machine motor 3 that rotatably drives the upper shaft; a rotary hammer fixedly fitted on the end of the upper shaft; a crankrod connecting a portion eccentric from the rotation center of the rotary hammer and a needle bar.

Moreover, when the upper shaft and the rotary hammer are rotationally driven by the sewing machine motor 3, the crank rod converts the rotational driving force to the needle bar into a vertical motion driving force and transmits it, thereby enabling reciprocating drive in the up and down direction.

(pressing cloth foot)

FIG. 2 is an enlarged perspective view showing the configuration around the presser foot 12 . The presser foot 12 is in the shape of a square frame, and the inner side runs through up and down. Then, the needle drops inside the presser foot 12, and sewing is performed inside the presser foot 12. As shown in FIG. In addition, the thread loosening member 41 also moves in the Y-axis direction within the frame of the presser foot 12 .

The presser foot 12 is held by the lower end of the presser foot support bar 14, which is supported at the lower portion of the front end of the sewing machine head 23 and is movable in the Z-axis direction. The rod 14 moves up and down by a stepping motor for cloth pressing (not shown).

That is, during sewing, the operation control mechanism 80 controls the stepping motor for cloth pressing based on the cloth thickness detected by the cloth thickness detection means 30 to adjust the height of the cloth pressing foot 12 to perform cloth pressing at an appropriate height.

(feeding mechanism)

The feed mechanism (not shown) has a feed dog located below the needle plate 13 and protrudes above the needle plate, and a transmission mechanism for moving the feed dog in the feed direction in the X-axis direction. The transmission mechanism, driven by the sewing machine motor, causes the feed dog to appear on the top of the needle plate 13, and at the same time, moves it in a certain direction (positive cloth feed direction) along the X-axis direction by the amount of the sewing pitch. In addition, the cloth feeding operation of the transmission mechanism is synchronized with the vertical movement of the machine needle 11 and is performed periodically. Thereby, the cloth feed mechanism feeds the to-be-sewn object on the needle plate 13 in units of sewing pitches.

(cloth thickness detection mechanism)

The cloth thickness detection mechanism 30 includes: a detection arm 31 near the presser foot 12 whose front end contacts the sewing object on the needle plate 13 from above; a potentiometer as an angle detection mechanism for detecting the swing angle of the detection arm 31 32. The potentiometer 32 is disposed at the lower portion of the front end of the sewing machine head 23 .

The potentiometer 32 has a rotatable detection shaft, and the detection shaft is supported inside the main body frame 20 . The potentiometer 32 has a function of outputting a signal corresponding to the rotation angle of the detection shaft to the motion control mechanism 80, and also pivotally supports the base end of the detection arm 31 via the detection shaft.

The detection arm 31 has its base end supported by the detection shaft of the potentiometer 32 , and its front end hangs obliquely downward in a direction perpendicular to the detection shaft. The front end portion of the detection arm 31 lands on the upper surface of the needle plate 13 at a position adjacent to the Y-axis direction of the presser foot 12, and is arranged so as to be in contact with the sewing object placed on the upper surface of the needle plate 13 during sewing. above butt. Therefore, during sewing, the detection arm 31 rotates according to the thickness of the object to be sewn, and the detection axis of the potentiometer 32 on the base end side is turned to the motion control mechanism 80 only by the amount of the rotation angle corresponding to the thickness. signal output. Then, the motion control mechanism 80 calculates the thickness of the object to be sewn from the detected rotation angle and the known length of the detection arm 31 .

(thread loosening mechanism)

The thread loosening mechanism 40 is provided with: a thread loosening member 41 which temporarily wraps around the stitches to be sewn by cross-cutting the vertical movement path of the needle 11 in a direction (Y-axis direction) intersecting the cloth feeding direction (X-axis direction). The suture of the object is thereby loosened; relative to the presser foot support bar 14, the holding body 42 of the thread loosening member 41 supported by rotation and up and down movement; through the holding body 42, the thread loosening member 41 The left and right drive mechanism 44 as a cross direction drive mechanism for rotation, and the vertical drive mechanism 51 as a vertical drive mechanism for moving the thread loosening member 41 in the Z-axis direction through the holder 42 .

The holder 42 is disposed near the lower end of the presser foot support rod 14 and slightly above the presser foot 12 . The holder 42 is formed with a through hole, and by passing the presser foot support rod 14 through the through hole, it can move along the presser foot support rod 14 and can rotate around the presser foot support rod 14 .

The thread loosening member 41, whose front end is fixedly equipped on the holding body 42, first extends from the base end to the direction perpendicular to the presser foot support bar 14 (along the X-axis direction), and then forms a U-shaped turn from the middle , and its front end is extended in completely opposite directions. In addition, the thread loosening member 41 has a front end side portion 41b and a base end side portion 41a parallel to each other with the folded portion as a boundary, but is arranged so as to be displaced from each other with respect to the Y-axis direction and the Z-axis direction.

As described above, since the holder 42 is supported so as to be rotatable around the presser foot support bar 14 , the thread loosening member 41 is also rotatable around the support bar 14 . Furthermore, the thread loosening member 41 is arranged so as to pass through the vertical movement path of the needle 11 by this rotation.

In addition, the thread loosening member 41, through the left and right driving mechanism 44, reciprocates with a certain angle range that crosses the up and down motion path of the machine needle 11, and the thread loosening member 41 maintains a state substantially along the X-axis direction (at least more than the Y-axis). direction, more tending to the range of the state along the X-axis direction) for reciprocating rotation.

The left and right movement mechanism 44 is a cross direction drive mechanism, which drives the thread loosening member 41 in a manner that crosses the up and down movement path of the machine needle 11 that passes through the needle thread and drives up and down along the direction intersecting with the cloth feeding direction; the left and right movement mechanism 44 is equipped with: the left and right driving motor 45 of the driving source of the rotation of thread loosening member 41; The driving arm 46 that is connected with the base end portion of the output shaft of left and right driving motor 45; The support shaft 47 on the main frame 20; the input arm 48 fixedly equipped on the upper end of the support shaft 47; the output arm 49 fixedly equipped on the lower end of the support shaft 47; the rotating end and the drive arm connected to the input arm 48 The connecting rod body 50 of the rotating end of 46.

The above-mentioned left and right driving motors 45 are pulse motors (stepping motors), which can control the driving frequency and driving amount (rotation amount) according to pulse signals from the motion control mechanism 80 described later, and the output shafts thereof are fixed along the Z-axis direction. On the main frame 20. Furthermore, the drive arm 46 extends in a direction perpendicular to the output shaft of the drive motor 45 .

The support shaft 47 is parallel to the Z-axis direction and supported by the main body frame 20 . Furthermore, the input arm 48 and the output arm 49 extend in a direction perpendicular to the support shaft 47 on the upper end portion and the lower end portion of the support shaft 47 , respectively. And since the driving arm 46 and the input arm 48 are connected by the connecting link body 50 at their respective rotational ends, the support can be supported via the respective arms 46, 48 and the link body 50 by driving the left and right drive motors 45. The shaft 47 and the output arm 49 rotate. In addition, it goes without saying that the left-right drive of the thread loosening member 41 by the left-right driving mechanism 44 is controlled so that the needle 11 reciprocated up and down by the vertical movement mechanism is positioned above the thread loosening member 41. Move sideways from time to time.

In the output arm 49 , the extended rotating end is provided in a bifurcated shape, and the engagement protrusion 43 protruding upward from the holder 42 is engaged in a state of being inserted inside. The fitting protrusion 43 is parallel to the presser foot support bar 14 passing through the through hole of the holding body 42, and protrudes from the holding body 42. on the opposite end. With this arrangement, when the output arm 49 is oscillated by the left and right drive motor 45, the holding body 42 and the thread release member 41 are rotated around the presser foot support rod 14 via the engaging protrusion 43, thereby making the thread release member The front end side portion 41b of 41 moves in the Y-axis direction.

The vertical movement mechanism 51 includes: a vertical drive motor 52 as a drive source for the vertical movement of the thread loosening member 41; a drive arm 53 connected to the base end of the output shaft of the vertical drive motor 52; The action link body 54 is rotatably supported on the main body frame 20;

The above-mentioned up-and-down drive motor 52, like the above-mentioned left-right drive motor 45, is a pulse motor (stepping motor), and it can control the drive frequency and drive amount (rotation amount) according to the pulse signal from the motion control mechanism 80 described later. Its output shaft is fixedly equipped on the main frame 20 along the Y-axis direction. Furthermore, the drive arm 53 extends in a direction perpendicular to the output shaft of the drive motor 52 . And, because one end portion of connecting link body 55 is connected on the rotating end portion of driving arm 53, so, by the driving of above-mentioned driving motor 52, when driving arm 53 rotates, can make connecting link body 55 substantially along its direction. Reciprocating motion in the length direction.

As described above, the action link body 54 is pivotally supported by the main body frame 20 via a support member (not shown) at one end thereof. Furthermore, the other end portion of the action link body 54 is provided with a boss-shaped protrusion 56 protruding in a direction perpendicular to the longitudinal direction thereof. On the side surface of the holder 42 described above, a groove 57 is formed parallel to the direction in which the thread releasing member 41 is extended (approximately the X-axis direction), and a working link is realized with the protrusion 56 inserted into the groove 57. The cooperation of body 54 and holding body 42. In addition, since the connecting link body 55 is connected to the middle position in the longitudinal direction of the working link body 54, when the up and down drive motor 52 is driven, the working link can be moved via the driving arm 53 and the connecting link body 55. The body 54 rotates around its one end. As a result, on the other end of the acting link body 54, the retaining body 42 and the loosening member 41 can be moved up and down along the presser foot support rod 14 through the protrusion 56. sports.

(motion control mechanism)

The operation control unit 80 is a control unit that controls the overall operation of the sewing machine 10, and includes a CPU 81, RAM 82, ROM 83, EEPROM 84, and the like as shown in the block diagram of Fig. 3 . In addition, to this motion control mechanism 80 , in addition to the operation panel 90 (input mechanism), a spindle drive circuit, a pedal device, a rotation speed detection circuit, a head rotation angle detection circuit, a comparison and determination unit, etc. are connected (not shown).

Specifically, the CPU 81 drives the sewing machine motor 3 by the main shaft drive circuit based on signals output from the operation panel 90 (input means), a pedal device not shown, a rotational speed detection circuit, a head rotation angle detection circuit, and the like. The control command can optimally control the amount of current flowing through the sewing machine motor 3 and control the rotation speed of the sewing machine motor 3 . In addition, the RAM 82 as a storage means is an operation area for temporarily storing data and the like during the processing of the CPU 81 , and the ROM 83 stores a control program for the CPU 81 to perform each processing. In addition, EEPROM84 is a non-volatile memory, and in the state of cutting off the power supply of sewing machine 10, the stored content will not disappear, and has storability. data etc.

Furthermore, an operation panel 90 is connected to the operation control mechanism 80 of the present embodiment, and an operation mode of the sewing machine 10 can be set or changed by an operator's input operation. In addition, in this embodiment, the left and right driving motor 45 and the vertical driving motor 52 of the thread loosening mechanism 40 are connected, and the driving frequency for controlling the left and right driving motor 45 and the vertical driving motor 52 can be input from the above-mentioned operation panel 90 . or each setting value of the driving amount.

The operation panel 90 , not shown in FIG. 1 , is provided on the upper portion of the main body frame 20 , and transmits each setting value input by an operator's operation to the motion control mechanism 80 as an output signal.

Furthermore, the motion control means 80 of the present embodiment has a function of controlling the drive frequency and drive amount of the left-right drive motor 45 and the vertical drive motor 52 based on the detection value of the cloth thickness detection means 30 described above. Specifically, the motion control mechanism 80 has a function of determining the right and left driving motor 45 corresponding to the value (cloth thickness) detected by the cloth thickness detection mechanism 30 according to the input operation from the above-mentioned operation panel 90 . Or the control of the drive amount of the up and down drive motor 52 . That is, it has the following functions. For example, when the original thickness of the cloth detected by the cloth thickness detection mechanism 30 is h, the amplitude in the left and right direction driven by the left and right driving motor 45 is a×h, and the vertical driving motor 52 drive up and down direction of the movement amount is b × h control (a, b can be set and input through the operation panel). In addition, each set value (for example, a, b) input from the operation panel 90 is stored in the EEPROM 84 of the motion control mechanism 80 to be saved. That is, by arbitrarily changing the values of a and b, it is possible to shake with an arbitrary amplitude. In addition, a predetermined set numerical value may be added to the detected thickness so as to obtain the amplitude in the left and right directions or the amount of movement in the up and down directions.

In addition, the operation control mechanism 80 has a function of accepting input (setting or modification) from the operation panel 90 even during the sewing operation.

In addition, the operation control mechanism 80 can set the left and right vibration frequency (drive frequency) of the thread loosening member 41 , that is, the interval ratio, by input operation from the operation panel 90 . Specifically, for example, when performing control (interval) in which the thread loosening member 41 is driven (vibrated) once with the number of needle drops set to n, the setting value n can be set from the operation panel 90 . More specifically, it has a function of performing control to drive the left and right drive motors 45 when the number of rotations of the output shaft of the sewing machine motor 3 is counted and an approximate count value is n.

Also, the operation control means 80 has a function of performing control to change the driving amount of the thread loosening member 41 when the cloth thickness detected by the cloth thickness detection means 30 is equal to or greater than a certain value (for example, ds). Specifically, when the detected thickness is less than ds, the motion control mechanism 80 performs an upward motion driven by the vertical drive motor 52 with the amplitude of a×h in the horizontal direction driven by the horizontal drive motor 45 as described above. In the control where the amount of movement in the downward direction is b×h, when the detected thickness is greater than ds, as described above, the amplitude in the left and right direction driven by the left and right drive motor 45 does not change to a×h, but is performed to move from up to down. The amount of movement in the up and down direction driven by the drive motor 52 is controlled by b′×h. At this time, the constant values ds and b' can be set by performing an input operation through the operation panel 90, and when set, the motion control means 80 stores the respective set values in the above-mentioned EEPROM 84.

Next, the operation of the sewing machine 10 according to the present embodiment will be described in detail with reference to the drawings.

First, through the cloth feeding operation of the cloth feeding mechanism, the cloth as the sewing object is conveyed between the needle plate 13 and the front end (lower end) of the detection arm 31. At this time, the front end of the detection arm 31 rises according to the thickness of the cloth. , and the detection arm 31 rotates around the detection axis of the potentiometer 32 . Then, the rotation angle of the detection shaft that rotates with the rotation of the detection arm 31 is detected by the potentiometer 32 . The angle detected here becomes an electrical signal corresponding to the rotation angle and is output to the motion control mechanism 80 .

The detection signal from the fabric thickness detection mechanism 30 is recognized by CPU81. Based on the cloth thickness calculated from the detection signal, the CPU 81 outputs signals indicating the drive amount to the left-right drive motor 45 and the up-and-down drive motor 52 in accordance with the operation control program stored in the RAM 82, ROM 83, EEPROM 84, etc. as storage means. , wherein the above-mentioned driving amount is used to drive the thread loosening member 41 in a direction (left-right direction) intersecting with the up-and-down motion path of the machine needle 11 during the period when the machine needle 11 rises to the upper position. In addition, a drive amount signal is intermittently output to the left and right drive motors 45 according to the set drive frequency. Then, the left-right drive motor 45 and the vertical drive motor 52 are driven based on the output signal, thereby driving the thread loosening member 41 in the vertical direction and the left-right direction. In addition, along with the driving of the thread loosening member 41, the thread is temporarily wound around the front end side portion 41b of the thread loosening member 41, so that the thickness of the suture corresponding to the cloth thickness of the sewing operation per one stitch (1 pitch) is ensured. length.

Next, referring to the explanatory diagram shown in FIG. 4 , the operation of securing a sufficient suture thread during sewing by the above-mentioned thread loosening mechanism 40 will be described in detail. Fig. 4 is a schematic view of the vicinity of the needle plate 13 where sewing is performed viewed from the upper side (Z-axis direction).

First, the cloth is conveyed from the lower side along the X-Y plane in Fig. 4 . a1 is the needle entry position, and the front end side portion 41b of the thread loosening member 41 is initially on standby in a state close to the left side in FIG. 4 with respect to the needle entry position a1. (Refer to FIG. 4(a)).

Next, when the cloth is fed upward (in the direction of the X-axis) in FIG. While the front end of the front end is positioned above the front end side portion 41b, the left and right driving motors 45 are driven, and the thread loosening member 41 moves to the right side of the needle entry position a1. At this time, the needle thread caught between the needle entry position a1 and the tip of the needle 11 approaches the right side of the needle entry position through the front end side portion 41b. The upper thread is caught in the next needle drop position a2 together with the front end of the needle 11, so that the upper thread is caught on the front end side portion 41b (see FIG. 4(b)). After the needle 11 is pulled out from the needle drop position a2 and raised, the front end side portion 41b moves to the left. Then, by driving the needle 11 into the third needle entry position a3, the upper thread is caught on the front end side portion 41b ( FIG. 4( c )). In this way, each time the needle is reciprocated twice up and down by the up-and-down movement mechanism, the thread loosening member 41 reciprocates once in the left and right (Y-axis) direction, guides the upper thread to the left and right, and hangs the upper thread. On the front end side portion 41b. The upper thread hung on the front end side portion 41b moves in the conveying direction (X-axis direction), that is, the upper side in FIG. ), after reaching the open end of the front end side portion 41b, separate from the front end side portion 41b, thereby ensuring a suture with a surplus amount (refer to FIG. 4 (g)). The length of the sewing thread as the remaining amount at this time is determined for each pitch based on the cloth thickness detected by the above-mentioned cloth thickness detection mechanism 30, and is determined by controlling the driving amount of the left and right driving motor 45 and the driving of the vertical driving motor 52. The amount is controlled to ensure the optimum length.

In addition, the motion control means 80 performs control to determine the driving amount of the horizontal drive motor 45 or the vertical drive motor 52 with respect to the value (cloth thickness) detected by the cloth thickness detection means 30 according to the input operation from the above-mentioned operation panel 90. . That is, for example, when the original thickness of the cloth thickness detected by the cloth thickness detection mechanism 30 is h, the amplitude in the left and right direction driven by the left and right drive motor 45 is h×a, and the vertical drive motor 52 is used to drive it. The amount of movement in the up and down direction is controlled by h×b (a, b can be set and input through the operation panel 90). In addition, the values a, b, etc. input from the operation panel 90 are stored in the EEPROM 84 to be saved. That is, by arbitrarily changing the values of a and b, shaking can be performed with an arbitrary amplitude.

In addition, the operation control mechanism 80 can accept input (setting or modification) from the operation panel 90 even during the sewing operation.

In addition, the motion control mechanism 80 can set the left and right vibration frequency (drive frequency) and interval ratio of the thread loosening member 41 through the input operation from the operation panel 90 . Specifically, for example, when performing control (interval insertion) to drive (vibrate) the thread loosening member 41 once with the number of needle drops set to n, the set value n can be set from the operation panel 90 . More specifically, when the number of revolutions of the output shaft of the sewing machine motor 3 is counted and an approximate count value is n, control is performed to drive the left and right drive motors 45 .

Furthermore, when the cloth thickness value is equal to or greater than a constant value ds, control is performed to change the ratio of the thread loosening amount determined by the cloth thickness value, so it is not limited to a constant change, and free and various sewing can be performed.

Next, the control operation of the operation control means 80 will be described in detail based on the flowchart shown in FIG. 5 .

First, when the start switch is turned on, the sewing machine motor 3 as the main motor is driven (step S1). With the driving of the sewing machine motor 3, it is judged by the CPU 81 whether the output shaft of the sewing machine motor 3 is at the thread loosening start angle (step S2). That is, by the rotation of the output shaft of the sewing machine motor 3, the machine needle 11 driven up and down by the up and down drive mechanism is in the range of the upper side of the thread loosening member 41, and it is judged by the CPU 81 whether the thread loosening member 41 has a crosscut machine needle 11. The timing of the up and down motion path.

Then, when the output shaft of the sewing machine motor 3 is at the starting angle of the thread loosening action (step S2; Yes), that is, when the machine needle 11 is at the upper position, 1 is added to the interval insertion count set in the motion control mechanism 80 to perform Counting, whereby the counts are sequentially added according to the rotation speed of the sewing machine motor 3 (step S3 ), and the number is recorded in the motion control mechanism 80 . Then, when it is recognized by the CPU 81 that the count value reaches the set value M stored in the storage mechanism, that is, the number of times of movement (interval rate) in the left and right direction relative to the number of times of up and down movement of the needle 11 (step S4), the accumulated The count value returns to 0 here (step S5), and it is judged whether the cloth thickness d detected by the cloth thickness detection mechanism 30 exceeds the cloth thickness ds stored in the storage mechanism or input or changed from the operation panel 90 (step S5). S6). That is, the CPU 81 judges whether or not the cloth thickness d detected by the cloth thickness detection mechanism 30 exceeds the threshold value ds for starting the spacing insertion operation. When cloth thickness does not exceed above-mentioned threshold value (step S6; No), for example, for cloth thickness d, be d*a with left and right driving motor 45, be d*b (a, b are the setting that can change) with driving motor 52 up and down. fixed value) to output signals for driving in the left and right directions and in the up and down directions respectively (step S7). Then, return to the processing of step S2.

In addition, when the cloth thickness exceeds the above-mentioned threshold value (step S6; Yes), for example, for the cloth thickness d, the left and right drive motor 45 is d×a, and the up and down drive motor 52 is d×b' (b' is changeable setting value) to output signals for driving in the left and right directions and in the up and down directions (step S12). Then, return to the processing of step S2.

In addition, in step S4, when the count value does not reach the interval insertion set value M (step S4; NO), according to the cloth thickness d detected by the cloth thickness detection mechanism 30 (step S8), proceed to drive the motor 52 only up and down. Control of driving for a driving amount of d×b (step S9). That is, when the count value, that is, the number of times of needle drop is less than the set interval insertion number of times, the driving in the left and right direction (interval insertion) is not carried out, and the control of only performing the up and down movement according to the thickness of the cloth is carried out (step S2 ).

In addition, in step S2, when the output shaft of the sewing machine motor 3 is not at the thread loosening start angle (step S2; No), during the sewing operation, it is judged whether to change the value corresponding to the cloth thickness d from the operation panel 90. Control of the input operation for determining the coefficient a of the drive amount in the left-right direction and the coefficient b of the drive amount in the up-down direction corresponding to the cloth thickness d (step S10 ). Then, when the input operation of changing the set values a and b is performed (step S10; Yes), control is performed to store the changed values as new driving amounts corresponding to the left-right direction and the up-down direction respectively (step S11 ), thereafter, it is judged whether the output shaft of the sewing machine motor 3 is at the thread loosening start angle (step S2). In addition, when the input operation of changing the set value a, b is not carried out (step S10; No), enter step S2 again, and judge whether the output shaft of the sewing machine motor 3 is the thread loosening start angle (step S2).

As described above, according to the sewing machine 10 of this embodiment, since the thread releasing member 41 of the thread releasing mechanism 40 adopts a motor that can control the amount of rotation independently of the driving source of the left and right driving mechanism 44 and the sewing machine motor 3, the left and right driving The mechanism 44 can freely set or change the drive frequency, drive amount, and drive speed in the left and right directions through the motion control mechanism 80 . Therefore, compared with the conventional sewing machine having the thread releasing member 41 driven by the driving force obtained from the sewing machine motor 3, the driving frequency of the thread releasing member 41 in the left and right directions can be freely set or changed. , driving amount and driving speed, etc. and control the driving. Thus, thread loosening can be performed with a margin or a small amount during the sewing operation per stitch (1 pitch). Therefore, corresponding to the thickness or material of various sewing objects, it is possible to perform sewing that can maintain the original thickness of the sewing object even after sewing, and it is possible to maintain the original thickness of the sewing object without damaging the original thickness of the sewing object. In the case of the thickness, the desired quality of the finished product is obtained.

In addition, the thread loosening member 41 of the thread loosening mechanism 40 can be driven by the control program of the motion control mechanism 80 based on the original thickness of the object to be sewn detected by the cloth thickness detecting mechanism 30 . Therefore, compared with the case where manual adjustment is performed, it is possible to freely set or change the lifting amount in the upward and downward directions. In this way, in the sewing operation of each stitch (1 pitch), the length of the suture that ensures the margin (slack) can be set extremely finely, and the sewing object can be maintained even after sewing. The sewing of the original thickness. Moreover, the drive of the vertical drive mechanism 51 is controlled by the motion control mechanism 80. The motion control mechanism 80 controls the vertical drive mechanism 51 based on the detection thickness detected by the cloth thickness detection mechanism 30, so that real-time feedback can be conveyed. The original thickness of the object to be sewn to the sewing position can ensure that each stitch of the suture has a length corresponding to the original thickness of the object to be sewn.

In addition, since the motion control mechanism 80 has the function of controlling the driving of the left and right driving mechanism 44 based on the thickness of the sewn object detected by the cloth thickness detecting mechanism 30, even the driving in the left and right directions can be fed back in real time by the cloth feeding mechanism. The original thickness of the object to be sewn can be accurately ensured that each stitch of the suture has a surplus length. In addition, since it is possible to control the operation of the vertical drive mechanism 51 and the left and right drive mechanism 44 based on the original thickness of the sewn object detected by the cloth thickness detection mechanism 30, the The original thickness of the object to be sewn can be arbitrarily combined with the driving frequency, driving amount and driving speed of these up and down driving mechanisms 51 and left and right driving mechanisms 44, so that stitches can be formed according to various sewing conditions or sewing patterns.

In addition, since the left and right driving motor 45 for driving the thread loosening member 41 left and right and the vertical driving motor 52 for driving up and down are both configured to use a pulse motor, the memory mechanism (RAM82, ROM83) provided in the motion control mechanism 80 , EEPROM84, etc.), can store the settings of the driving amount or driving frequency, etc., and can improve the reproducibility when sewing the same sewing object. Therefore, the time required for setting the sewing conditions can be greatly shortened, and the operation efficiency can be greatly improved.

In addition, since the driving frequency and driving amount of the thread loosening member 41 can be set and changed only through input operations of the operation panel connected to the motion control mechanism 80, it is unnecessary to adjust the manual operation compared with the case of adjusting by manual operation. Complicated operation. Therefore, the time required for setting and changing can be greatly shortened.

In addition, since the numerical control of setting input from the operation panel 90 can be adopted, the reproducibility of the same sewing operation is improved, and the switching of sewing quality can be smoothly performed, thereby improving productivity.

In addition, as long as the drive frequency and drive amount of the left-right drive motor 45 and the up-and-down drive motor 52 are controlled by the motion control mechanism 80, they are not limited to pulse motors, and may be, for example, servo motors.

Claims (3)

1. Sewing machines is characterized in that having:

The cloth presser of on described needle plate, sewn object being pushed;

Thread releasing mechanism, it has the loose ends parts, these loose ends parts dispose along cloth feeding direction, and the path that moves up and down along the direction crosscut eedle that intersects with cloth feeding direction hangs over the suture between described eedle and the described sewn object and pulls out the line length that has surplus thereby put on the spot;

Described thread releasing mechanism has crisscross driving mechanism, this crisscross driving mechanism, with each pin along and the mode in the path that moves up and down of the described eedle of direction crosscut that intersects of described cloth feeding direction drive described loose ends parts,

Also have controlling organization, this controlling organization can be controlled the driving frequency or the drive amount of described crisscross driving mechanism.

2. Sewing machines according to claim 1 is characterized in that,

Described thread releasing mechanism has:

Can drive the driving mechanism up and down of described loose ends parts along the vertical direction; With

Detection is by the thickness detection mechanism of the thickness of the described sewn object of described cloth feeding mechanism conveying;

Described controlling organization is controlled described driving mechanism up and down based on the detected thickness of described thickness detection mechanism.

3. according to the Sewing machines described in the claim 2, it is characterized in that,

Described controlling organization can be controlled described crisscross driving mechanism based on the detected value of described thickness detection mechanism.

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