CN104818587A - Sewing machine - Google Patents

Abstract

The present invention provides a sewing machine which prevents wrapping stitches and appropriately forms needle drop holes of cutter needles. The sewing machine has: needle bar (12); kettle (13); sewing machine motor (21); Carry out the thread gathering of the off-line; the moving mechanism (80), which moves the sewn object arbitrarily; and the control part (90), which controls the moving mechanism based on the sewing data, and the sewing needle is formed on the sewn object. The cutter needle (11) of the needle drop hole in the shape of a long hole, the control part performs the rotation control of the needle bar by using the needle bar rotation mechanism corresponding to the moving direction of the cloth, and forms one by one stitches relative to the direction of the sewing object. The cloth moving direction has stitches associated with an arbitrary inclination angle, and the control unit executes thread winding control using the thread winding mechanism when the cloth moving direction is within a predetermined thread winding angle range.

Description

sewing machine

technical field

The present invention relates to a sewing machine for realizing ideal stitches.

Background technique

Among the stitches formed by a sewing machine, there are two kinds of stitches: an ideal stitch (refer to FIG. 26(A) ), which is formed by winding the upper thread and the lower thread in a uniform state with each other; and a winding needle. trace (see FIG. 26(B)), which is formed in such a way that only the upper line draws a spiral. As an ideal stitch, the tension of the upper thread and the tension of the lower thread act on the fabric in good balance with each other, resulting in a good finished product, and can provide a sewn product with high sewing quality. On the other hand, wrapping stitches have the following problems, that is, the tension of the upper thread is easily weakened, and the tension balance of the lower thread is poor, which easily causes adverse effects such as loose stitches, and easily leads to a decrease in sewing quality.

In a sewing machine that forms stitches according to a prescribed sewing pattern by holding the material and feeding the material in any direction, the upper thread with respect to the winding direction of the needle and the lower thread extending from the kettle to the needle hole of the needle plate The side to which the needle is dropped depends on the moving direction of the fabric, and these are the causes of wrapping stitches.

Therefore, in the existing sewing machine, the angular range of the cloth moving direction in which the upper thread fluctuates with respect to the winding direction of the sewing needle and the needle drop position with respect to the two areas separated by the lower thread occurs is investigated in advance. Within the angle range of the wrapping stitch, the rotation of the needle bar or the winding up of the lower thread is performed, and the wrapping stitch is avoided (for example, refer to Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2012-213603

In addition, in recent years, it has been studied to apply a knife needle to the sewing machine of Patent Document 1. The knife needle has a flat front end and forms a straight needle drop hole on a sewing object made of leather or the like.

As shown in Figure 27, the cutter needle forms a straight needle drop hole h at a fixed sewing pitch, and the straight needle drop hole h is inclined at a fixed angle relative to the moving direction F of the fabric forming the stitches Uk. Extending from one end h1 of a straight needle hole h to the other end h2 of the next needle hole h, a pattern is formed such that the needle holes h and the stitches Uk alternately form a zigzag shape.

In the case of holding the material and forming stitches according to the specified sewing pattern, since the direction of material movement changes with the sewing pattern, in order to form stitches inclined at a fixed angle regardless of the direction of material movement, it is necessary to Corresponding to the change of the moving direction of the cloth, the direction of the straight needle drop hole h is changed.

Since the above-mentioned conventional sewing machine has a needle bar rotation mechanism, the cutter needle can be rotated by this needle bar rotation mechanism.

However, since the needle bar rotation mechanism of the above-mentioned existing sewing machine uses a cam mechanism to rotate the needle bar, the rotation direction of the needle bar is fixed and the range of the rotation angle is also limited by the cam, so it cannot correspond to the moving direction of the cloth. While properly adjusting the direction of the cutter needle, it is difficult to utilize the needle bar rotation mechanism for avoiding wrapping stitches for the rotation of the cutter needle.

Contents of the invention

An object of the present invention is to perform appropriate sewing with a cutter needle while more effectively preventing wrapping stitches.

The present invention is a sewing machine comprising: a needle bar that holds a sewing needle and moves up and down; a kettle that winds an upper thread and a lower thread through a rotating action; and a sewing machine motor that drives the up and down movement of the needle bar. source; needle bar rotation mechanism, which makes the needle bar rotate around the axis in the up and down direction; thread winding mechanism, which uses thread winding parts on the lower side of the needle plate to carry out thread winding of the off-line; moving mechanism, which makes the The sewing object moves along the horizontal plane in any cloth moving direction to perform needle drop; the control part controls the moving mechanism, the needle bar driving mechanism and the thread winding driving mechanism based on the sewing data. The sewing data determines the needle drop position of each stitch for forming a predetermined sewing pattern or the movement amount of the sewing object for each stitch, and the sewing machine is characterized in that the sewing needle is The sewing product forms a cutter needle with a substantially long hole-shaped needle drop hole. The needle bar rotation mechanism can adjust the angle of the needle bar from the reference position to the front and back directions. The control part and the fabric The movement direction is corresponding to the rotation control of the needle bar by means of the needle bar rotation mechanism, forming a line in which each stitch has an arbitrary inclination angle with respect to the cloth moving direction of the sewn object In addition, the control unit executes thread windup control using the thread windup mechanism when the moving direction of the cloth is within a predetermined thread windup angle range.

In addition, in the sewing machine described above, the control unit may divide the moving direction of the cloth in which the object is to be sewn by the moving mechanism into a plurality of angular ranges, and each of the plurality of angular ranges may be divided into a plurality of angular ranges. determining the rotation angle of the needle bar, and controlling the needle bar rotation mechanism according to which of the plurality of angular ranges the cloth moving direction corresponding to each falling needle based on the sewing data belongs to. , to become the rotation angle determined for that angular range.

In addition, in the above sewing machine, the control unit may be configured to perform rotation of the needle bar using a needle bar rotation mechanism when the cloth moving direction is within a predetermined angle range for changing the thread winding direction. The control is performed so that the rotation angle becomes a predetermined rotation angle, and at least one angle range includes the wire winding direction changing angle range among the plurality of angle ranges.

In addition, in the above sewing machine, the rotation angle of the needle bar determined corresponding to each of the plurality of angle ranges may be determined such that the long-hole-shaped drop formed by the cutter needle The inclination angle of the pinhole is within a fixed angle range with respect to any of the moving directions of the cloth.

In addition, the above sewing machine may be configured to include setting means for arbitrarily setting the rotation angle of the needle bar corresponding to each of the plurality of angle ranges.

The effect of the invention

The present invention can carry out the thread winding in the thread winding angle range, and can also execute the rotation of the needle bar in the changing angle range of the winding direction of the thread, thus avoiding wrapping stitches.

Moreover, since the rotation angle of the needle bar can be adjusted from the reference position to the forward and reverse directions by the needle bar rotation mechanism, the rotation angle of the needle bar can be adjusted arbitrarily in a wide range. Adjust the direction of the cutter needle appropriately according to the moving direction of the cloth.

Therefore, it is possible to achieve both proper formation of the stitches of the cutter needles and avoidance of wrapping stitches.

In addition, when the configuration is such that the cloth moving direction (moving direction of the sewing object) by the moving mechanism is divided into a plurality of angle ranges, and when one of the angle ranges includes the thread winding direction change angle range, it is possible to more appropriately Both forming a proper cutter needle stitch and avoiding wrapping stitches are achieved.

In addition, "the angle range includes the change angle range of the wire winding direction" may mean that the angle range coincides with the change angle range of the wire winding direction, or may include the change angle range of the wire winding direction.

In addition, the rotation angle of the needle bar corresponding to each of the plurality of angle ranges is determined so that the direction of the needle drop hole of the directional shape formed by the cutter needle becomes a fixed angle range with respect to the cloth moving direction. In the case of inside, the stitches of the cutter needle can be formed more appropriately.

Description of drawings

Fig. 1 is a perspective view of the sewing machine.

Fig. 2 is a side view showing a state in which a part of the front end of the arm of the sewing machine is cut away.

Fig. 3(A) shows a plan view of the kettle, and Fig. 3(B) shows a front view of the kettle.

Fig. 4 is a perspective view of the needle bar rotating mechanism.

Fig. 5 is a side view with a part of the needle bar turning mechanism cut away.

Fig. 6 is a plan view with a part of the needle bar turning mechanism cut away.

Fig. 7 is a top view of the thread winding mechanism.

Fig. 8 is a perspective view of the winding mechanism.

Fig. 9 is a top view of the thread wrapping cam member.

Fig. 10 is a sectional view of the thread adjusting device.

Fig. 11(A) is a front view of the cutter needle, and Fig. 11(B) is a side view of the cutter needle.

Figure 12 is a top view of the cutter needle.

Fig. 13 is a block diagram showing a control system of the sewing machine.

Fig. 14 (A) shows the cross-sectional view of the state where the upper thread passing through the needle eye is wound to the left winding direction when the sewing needle penetrates the cloth, and Fig. 14 (B) is a cross-sectional view showing the state that the upper thread is wound to the right winding direction.

Fig. 15 is an explanatory view showing the relationship between the moving direction of the cloth and the cause of wrapping stitches.

Fig. 16 is a graph showing which of thread winding and needle bar rotation should be performed in an angular region corresponding to the cloth moving direction.

Fig. 17 is an explanatory view showing the angular relationship between the needle entry hole and the cloth moving direction.

Fig. 18 is an explanatory view showing a rectangular sewing pattern and the relationship between the needle bar rotation angles in each section.

Fig. 19 is an explanatory view showing the relationship between four angle ranges determined for the cloth moving direction and needle bar rotation angles corresponding to the respective angle ranges.

Fig. 20 is a graph showing the relationship between the upper shaft angle and the height of the sewing needle.

Fig. 21 is the kinematic diagram of the sewing needle, kettle and balance in the sewing machine.

Fig. 22 is a plan view showing the positional relationship between the thread gathering member and the needle hole in a state where the thread gathering is not performed.

Fig. 23 is a plan view showing the positional relationship between the thread pulling member and the needle hole in a state where the thread pulling is being carried out.

Fig. 24 is an explanatory view showing the state of pulling out the bobbin thread when thread winding is performed.

Fig. 25 is a flowchart of wrapping stitch avoidance control and cutter needle angle correction control.

Fig. 26(A) is an explanatory diagram showing an ideal stitch, and Fig. 26(B) is an explanatory diagram showing a wrapping stitch.

Fig. 27 is an explanatory diagram showing stitches using a cutter needle.

Explanation of labels

11 cutter needle

11a eye of the needle

12 Needle Bars

13 kettles

14 pin board

20 needle up and down moving mechanism

21 Sewing machine motor

22 upper shaft

30 Needle bar rotation mechanism

31 Needle bar rotating table

32 needle bar rotation motor

40 kettle mechanism

50 wire wrapping mechanism

51 wire wrapping parts

52 Winding motor

80 cloth moving mechanism (moving mechanism)

83 X-axis motor

84 Y axis motor

90 control device (control part)

91 CPUs

94 data memory

95 Operation panel (setting unit)

100 sewing machines

332 drive sprocket

333 Support bracket

335 driven sprocket

336 timing belt

511 Guidance Department

521 Motor mounting table

522 drive gear

523 driven gear

524 axis of rotation

531 Cam section

532 Fixed interval

533 Fixed interval

534 action range

541 Roller Wrist

541a, 541b Wrist

542 Support shaft

543 coil spring

544 stop

A, B Cloth movement angle range (winding angle range)

C Cloth movement angle range (change angle range of thread winding direction)

h pinhole

Detailed ways

[summary of embodiment]

Embodiments of the present invention will be described based on FIGS. 1 to 25 .

The sewing machine 100 described below as the present embodiment is a so-called electronic cycle sewing machine, and has a holding frame as a cloth holding part, and the holding frame holds a sewn object to be sewn, that is, a cloth. The cutter needle moves relatively to form a sewing pattern based on predetermined sewing data on the cloth held by the holding frame.

In addition, this sewing machine 100 is characterized in that the following two types of control are implemented: wrapping stitch avoidance control, which selectively implements the winding up of the lower thread or the stitching of the needle according to the moving direction of the cloth moved by the holding frame. rotation of the bar; and cutter needle angle correction control, which forms the needle drop hole at an inclination angle corresponding to the cloth moving direction.

Fig. 1 is a perspective view of a sewing machine 100 according to the present invention, and Fig. 2 is a cross-sectional view showing the inside of a sewing machine arm portion 101a which will be described later.

Here, the direction in which the cutter needle 11 described later moves up and down is defined as the Z-axis direction or the up-down direction, and a direction perpendicular to it is defined as the X-axis direction or the left-right direction, and the Z-axis direction and the X-axis direction are defined as The direction in which these two are orthogonal is defined as the Y-axis direction or the front-back direction. In addition, "front" in the following description indicates the direction in which the sewing worker is located relative to the sewing machine 100; ” indicates the right hand side of the operator in the front side of the sewing machine 100 facing the sewing machine 100 .

The above-mentioned sewing machine 100 mainly includes: a needle bar 12, which holds the cutter needle 11 at its lower end, and moves up and down along the Z-axis direction; Move up and down; needle bar rotation mechanism 30, which rotates the needle bar 12 around the center line of the needle bar 12 along the Z-axis direction; kettle mechanism 40, which has a kettle 13 for winding the lower thread and the upper thread passing through the cutter needle 11 ; The thread pulling mechanism 50, which carries out the thread winding of the lower thread; the thread regulating device 70, which performs the variable adjustment of the thread tension of the upper thread; the cloth moving mechanism 80 as a moving mechanism, which keeps the cloth and moves it arbitrarily along the X-Y plane The movement and positioning are performed; the control device 90 as an action control unit controls the actions of the above-mentioned structures; and the sewing machine frame 101 supports the structures of the sewing machine 100.

[Sewing rack]

As shown in FIG. 1 , the sewing machine 100 has a sewing machine frame 101 having a substantially U-shaped outer shape as viewed from the X-axis direction. This sewing machine frame 101 has: a sewing machine arm portion 101a, which forms an upper portion of the sewing machine 100, and extends in the Y-axis direction; a sewing machine base portion 101b, which forms a lower portion of the sewing machine 100, and extends in the Y-axis direction; and an upright body portion 101c, which The upper and lower sewing machine arm parts 101a and sewing machine base part 101b are connected.

[Sewing needle up and down movement mechanism]

As shown in Fig. 1 and Fig. 2, the sewing needle up and down movement mechanism 20 has: the upper shaft 22, which is rotatably supported in the state along the Y-axis direction in the above-mentioned sewing machine arm portion 101a; Rotation force is applied to one end of the shaft 22; a needle bar crank 23 is provided on the other end of the upper shaft 22; a crank rod 24 is connected to an eccentric position of the needle bar crank 23 relative to the rotation center at one end; The holding part 25 engages with the periphery of the needle bar 12 and is held and fixed by screws not shown in the figure;

The upper shaft 22 is directly connected to the output shaft of the sewing machine motor 21 and is driven to rotate. The rotation of the upper shaft 22 is converted into a reciprocating motion up and down by the needle bar crank 23 and the crank rod 24 and transmitted to the needle bar 12 .

The transmission member 26 has: a top plate portion 261 and a bottom plate portion 262 between which the needle bar holding portion 25 is provided; and an opening 263 for inserting a needle bar between the top plate portion 261 and the bottom plate portion 262 during assembly. Holding part 25.

Both the top plate portion 261 and the bottom plate portion 262 are formed with through holes in the central portion in a plan view, through which the needle bar 12 can be inserted. The bar holding portion 25 is held and fixed so that the transmission member 26 and the needle bar 12 can be interlocked in the vertical direction, and can be rotated around the Z axis around the needle bar 12 .

Further, the transmission member 26 has a support shaft 264 along the Y-axis direction, and the lower end portion of the crank rod 24 rotatably supports the support shaft 264 via a metal bearing. In addition, this support shaft 264 penetrates the crank rod 24, and is connected with the square stopper 265 behind it.

The square stopper 265 has a rectangular shape, and guide grooves 101d are formed on the inner wall of the sewing machine arm 101a on both sides in the X-axis direction. The guide grooves 101d are used to move the square stopper 265 up and down without rotating.

Therefore, when the lower end portion of the crank rod 24 moves up and down, it is possible to prevent the transmission member 26 from swinging around the support shaft 264 and from shaking in the X-axis direction, and can transmit a stable vertical movement to the needle bar 12 .

[kettle]

Fig. 3(A) is a top view of the kettle, and Fig. 3(B) is a front view.

In the sewing machine 100 according to this embodiment, a case where a semi-rotary kettle is used as the kettle 13 is shown as an example. The kettle 13 has: a middle kettle 132, which reciprocates synchronously with the vertical movement of the needle bar 12 inside the large kettle 131; a bobbin 133 and a bobbin housing 134 accommodated inside the middle kettle 132; and a driver (not shown). , which applies reciprocating rotation to the middle kettle 132. In addition, a driver is connected to the lower shaft connected to the above-mentioned upper shaft 22 via a speed increasing mechanism, and the middle tank 132 reciprocates at twice the speed of the vertical movement of the cutter needle 11 .

That is, the above-mentioned sewing machine motor 21 serves as a driving source for the vertical movement of the needle bar 12 and the rotation of the kettle 13, and the upper and lower threads are entangled by the vertical movement of the cutter needle 11 and the rotation of the kettle 13. In addition, since the structure and structure of a semi-rotary tank are well known, detailed description is abbreviate|omitted.

[Needle bar rotation mechanism]

The needle bar turning mechanism 30 will be described based on FIG. 2 and FIGS. 4 to 6 .

The lower end side of the needle bar 12 is supported by the lower needle bar bearing (metal bearing) 122 in a vertically movable and rotatable state, and the upper end side of the needle bar 12 is supported by the needle bar rotating table 31 provided on the needle bar rotating mechanism 30. The upper needle bar bearing (metal bearing) 121 at the lower end is supported so as to be movable up and down.

In addition, the lower end of the needle bar 12 holds the cutter needle 11 , and a rectangular plate 123 for preventing rotation with respect to the needle bar rotating base 31 is attached to the upper end. The rectangular plate 123 is inserted into the penetration groove 12a formed in the upper part of the needle bar 12, and is fixed with a screw (not shown). Therefore, with respect to the needle bar 12, the rectangular plate 123 protrudes on both sides in the radial direction of a circle centered on the needle bar 12, and these protruding parts constitute a pair of convex parts 123a, 123b. In addition, the needle bar 12 and the rectangular plate 123 are composed of different members, but instead of such a structure, it is also easy to think of forming a pair of protrusions integrally with the needle bar.

The needle bar turning mechanism 30 has: a cylindrical needle bar turning table 31 which supports the needle bar 12 so as to be movable up and down inside; a drive source for the rotational motion around the Z-axis; and a transmission mechanism 33 that transmits the rotational motion from the needle bar rotational motor 32 to the needle bar rotational base 31 .

The upper end and the lower end of the needle bar turntable 31 are supported by metal bearings 311 , 312 so as to be rotatable about the Z axis around the needle bar 12 . The upper metal bearing 311 is fixedly attached to the vicinity of the upper surface of the sewing machine arm 101a.

In addition, the lower metal bearing 312 is held by a support member 313 attached to the wall surface of the sewing machine arm 101 a via a support arm 312 a ( FIG. 4 ) extending radially outward.

Since the needle bar rotating table 31 supports the upper and lower parts by these, the state facing the vertical vertical direction can be firmly maintained, and the smooth up and down movement of the needle bar 12 can be realized.

In addition, since the needle bar 12 is also supported by the upper and lower needle bar metal bearings 121 , 122 , it can be firmly maintained in a vertically vertical direction together with the needle bar turntable 31 .

In addition, with respect to the needle bar turning table 31, a long-hole-shaped opening along the Z-axis direction is formed on both sides of the Y-axis direction in FIG. Guide plates 314, 314 for the strips. Each guide plate 314, 314 has a long hole 314a penetrating in the Z-axis direction, and the convex part 123a, 123b of the needle bar 12 is inserted into each long hole 314a, 314a from the inner side. The width of the elongated hole 314a is formed slightly wider than the width of the protrusions 123a, 123b, whereby the protrusions 123a, 123b can be slid along the elongated hole 314a. That is, through the cooperative action of the above-mentioned guide plates 314, 314 and the protrusions 123a, 123b of the needle bar 12, the needle bar 12 can move around the Z axis together with the needle bar turning table 31 without hindering the vertical movement. turn.

The transmission mechanism 33 has: a motor bracket 331 that supports the needle bar rotation motor 32 with the output shaft of the needle bar rotation motor 32 facing downward; and a support bracket 333 that rotatably supports the needle bar rotation table with a bearing 334 31, the protruding end protruding from the upper surface of the sewing machine arm 101a; the driving sprocket 332, which is fixedly installed on the output shaft of the needle bar rotating motor 32; the driven sprocket 335, which is fixedly installed on the needle bar rotating motor 32; and the timing belt 336 hung on the driving sprocket 332 and the driven sprocket 335 .

Accordingly, when the needle bar turning motor 32 is driven, rotation can be applied to the needle bar turning base 31 and the needle bar 12 can be rotated together with the needle bar turning base 31 . In addition, the needle bar rotation motor 32 can be driven in the normal direction and the reverse direction under the control of the control device 90, and can rotate the cutting needle 11 and the needle bar 12 in the forward and reverse directions.

In addition, the center line of the needle bar 12 and the rotation center line of the needle bar turntable 31 are both located on the same straight line.

Utilizing the above structure, the needle bar rotating mechanism 30 can make the cutter needle 11 move clockwise and counterclockwise from the state of being located at the reference position (refer to the orientation in FIG. 12 ) described later, within a range of at least 45° Forward and reverse rotation at any angle. In addition, by using the needle bar rotation motor 32 with a higher speed or higher torque, it is possible to rotate the cutting needle 11 in the forward and reverse directions over a wider range.

[Middle presser foot]

Reference numeral 13 in FIG. 2 is an intermediate presser which, like the needle bar 12, uses the sewing machine motor 21 as a drive source, and moves up and down synchronously with the needle bar 12 by a known motion transmission mechanism not shown.

The intermediate presser foot 13 moves the cylindrical frame into which the cutter needle 11 is loosely inserted slightly above the cloth with an amplitude smaller than that of the needle bar 12. When the cutter needle 11 moves upward, it presses the cloth, so that the fabric is not pulled up.

[Libra mechanism]

The number 16 among Fig. 2 and Fig. 5 is a scale mechanism.

This balance mechanism 16 is composed of the following parts: a link member 161, one end of which is pivotally supported by an eccentric shaft that supports the upper end of a crank rod 24 provided on the needle bar crank 23; and a bell crank member. 163, which has a scale of 162.

The bell crank member 163 has a base pivotally supported inside the sewing machine arm 101a, and two arms extending from the base, and one arm serves as a scale 162 extending to the outside of the sewing machine arm 101a. In addition, the other arm portion 163 a is connected to the other end portion of the link member 161 to input a rotational motion to the bell crank member 163 .

A through hole through which the upper thread U is inserted is formed at a front end portion of the scale 162 .

With the above configuration, the balance mechanism 16 moves the balance 162 up and down at the same cycle as the needle bar 12 . However, the scale 162 is designed so that it reaches the top dead center with a delay of about 60° in the angle of the upper shaft compared with the needle bar 12 .

[winding mechanism]

Fig. 7 is a top view of the thread winding mechanism 50, and Fig. 8 is a perspective view.

The thread winding mechanism 50 is provided inside the sewing machine base portion 101b, and is provided on the lower side of the needle plate 14, and the thread winding member 51 performs winding of the lower thread. The thread pulling mechanism 50 has: a thread pulling part 51, which uses the front end to hook and move the lower thread passed from the bobbin housing to the needle hole 15 of the needle bar 14, thereby changing the path of the lower thread; Motor 52, which becomes the driving source of the wire pulling action of the wire pulling part 51; the wire winding cam part 53, which is operated by the wire winding motor 52; action is applied; and the link mechanism 55, which transfers the thread-winding action of the lower thread from the roller 54 to the thread-winding part 51. The link mechanism 55 has a roller arm 541 and a support shaft 542 .

The thread winding motor 52 is supported by a motor mount 521 mounted inside the sewing machine base portion 101b with its output shaft facing vertically upward, and a driving gear 522 is attached to the output shaft. On the upper surface of the motor mount 521 , a small-diameter driven gear 523 is provided adjacent to the driving gear 522 , and both mesh with each other so that speed-up rotation is transmitted from the driving gear 522 to the driven gear 523 .

The driven gear 523 is connected to the thread wrapping cam member 53 via its rotation shaft 524 , and the rotation of the driven gear 523 is transmitted to the thread wrapping cam member 53 .

FIG. 9 is a plan view of the thread wrapping cam member 53 . The thread winding cam member 53 is substantially fan-shaped, and its substantially arc-shaped outer edge portion serves as a cam portion 531 that abuts against the roller 54 to be displaced. In addition, the cam portion 531 has arc-shaped cam-shaped immovable sections 532 and 533 maintaining a certain distance from the rotation center position, and an actuating section 534 connecting the two immobile sections 532 and 533 is formed between them. . Both of the immovable sections 532 and 533 are in the shape of a cam maintaining a constant distance from the rotation center, but the radius of the immobile section 533 is set larger than that of the immobile section 532 .

The operating section 534 has a cam shape, and its diameter gradually increases from the boundary position with one of the non-moving sections 532 , and reaches the same diameter as the non-moving section 533 at the boundary position with the other non-moving section 533 .

That is, the wire pulling cam member 53 has a cam portion 531, and the cam portion 531 continuously forms the immovable intervals 532, 533 where the wire pulling member 51 is not pulled up, and the motion interval 534 where the wire pulling member 51 is pulled up. .

Although the details will be described later, the thread pulling mechanism 50 rotates the thread pulling member 51 in a fixed direction within a predetermined angle range at a timing when it becomes within a certain upper shaft angle range during sewing, and when it becomes another Timing within the range of the upper shaft angle causes the thread wrapping member 51 to rotate in the opposite direction with the same angle range as last time. Therefore, the higher the sewing speed, the higher the rotational movement of the thread gathering member 51 in each direction must be performed at high speed.

Therefore, design the thread pulling cam member 53 in the following manner, that is, the cam portion 531 of the thread pulling cam member 53 is provided with an immovable section 532 or 533, and the immovable section 532 or 533 is used as the standby position of the roller 54. After the moving section 532 or 533 is sufficiently accelerated as the assisting period when the roller 54 moves relatively, the roller 54 moves relatively along the moving section 534 . Thereby, the high-speed rotational operation of the thread winding member 51 can be performed only by utilizing the high-speed range of the thread winding motor 52 .

In addition, while the thread gathering member 51 performs reciprocating rotation, it temporarily stops between the outward rotation and the return rotation.

Therefore, a non-moving interval 532 is used for the assisting period when the thread gathering part 51 is turned outward, and another stationary section 533 is used for the assisting period when the thread gathering part 51 loop rotates.

Thereby, it is possible to speed up the rotation of the outward path and the rotation of the return path of the thread pulling member 51 respectively.

In addition, it may also be configured such that an origin sensor for detecting the reference standby position of the thread winding cam member 53 is provided in the thread winding mechanism 50, and by starting the rotation of the thread winding cam member 53 from the standby position, the thread winding motor can be rotated. When 52 just becomes high-speed state, wrapping wire part 51 carries out the rotation action.

The roller 54 abutted against the cam portion 531 of the thread pulling cam member 53 is rotatably held on one arm portion 541a of the roller arm 541 as a bell crank, and the other arm portion 541b of the roller arm 541 holds the thread. Part 51.

In addition, in this roller arm 541 , the base end sides of the two arm portions 541 a , 541 b are rotatably supported by a support shaft 542 provided on the motor mount 521 .

In addition, the roller wrist 541 is pre-tensioned by the torsion coil spring 543 so that the roller 54 is always in contact with the cam portion 531 of the thread winding cam member 53 .

In addition, a stopper 544 is provided on the roller arm 541 so that the roller 54 will not rotate excessively due to the torsion coil spring 543 when the roller 54 falls off from the cam portion 531 when the thread winding cam member 53 rotates excessively.

The base end portion of the thread gathering member 51 is held by the rotating end portion of the arm portion 541b of the roller arm 541 , and the front end portion of the thread gathering member 51 extends toward the needle hole 15 on the lower side of the needle plate 14 . In addition, the front-end|tip part side of this thread holding member 51 becomes a free end, and also the front-end|tip part is formed in a sharp shape. And thread pulling member 51 carries out following action: usually its front end portion moves away from the front with respect to needle hole 15 and recedes, and when pulling up thread, the front end portion passes through needle hole 15 and moves directly below, and from bobbin housing 134 to The lower thread delivered by the pinhole 15 snaps and draws the thread backward.

In addition, a guide part 511 is provided on the left side of the needle plate 14, and a plate-shaped thread gathering member 51 is supported in the gap between the upper and lower two plate-shaped bodies, so that the thread gathering member 51 is inserted into the thread gathering member 51 before and after the turning action. In the gap, the vibration in the up and down direction when the wire wrapping member 51 rotates is suppressed.

According to the above structure, in the thread winding mechanism 50, if the roller 54 is located at the predetermined standby position on the immovable section 532 of the cam portion 531 of the thread winding cam member 53, the thread winding motor 52 is started to be driven, and the thread winding The cam member 53 starts to rotate via the driving gear 522 and the driven gear 523 .

Then, the roller 54 is accelerated in the immovable section 532 of the thread wrapping cam member 53 by the thread wrapping motor 52 and relatively moved at a high speed in the operating section 534 . Thereby, the roller arm 541 rotates, and the thread pulling member 51 rotates. Then, by the forward rotation operation of the thread gathering member 51, the thread gathering member 51 passes right under the needle hole 15 to wind up the lower thread D backward.

Then, when the roller 54 reaches a predetermined stop position in another immovable section 533, the motor 52 for thread winding stops driving.

In addition, the winding mechanism 50, from the state where the roller 54 is located in the immovable section 533, drives the winding motor 52 in a manner of reverse rotation, and makes the roller 54 relatively move while accelerating in the immovable section 533. In the section 534, the loop rotation operation of the thread wrapping member 51 is performed.

Then, when the roller 54 reaches the original retreat position in the immovable section 532, the driving of the motor 52 for thread winding is stopped.

[cloth moving mechanism]

As shown in Figure 1, the cloth moving mechanism 80 has: a holding frame 81, which holds the cloth on the upper surface of the sewing machine base portion 101b; a support arm 82, which supports the holding frame 81, so that the holding frame 81 can be raised and lowered; An X-axis motor 83 that moves the holding frame 81 in the X-axis direction via the support arm 82 , and a Y-axis motor 84 shown in FIG. 13 that moves the holding frame 81 in the Y-axis direction via the support arm 82 .

The cloth moving mechanism 80 can move and position the cloth to an arbitrary position on the XY plane via the holding frame 81 through the above-mentioned structure, and can drop needles at any position for each stitch, thereby enabling free formation of stitches. That is, the cloth moving mechanism 80 called a moving mechanism moves the cloth to an arbitrary position along the horizontal plane, and performs needle drop at the arbitrary position.

[thread adjustment device]

FIG. 10 is a cross-sectional view of the wire adjusting device 70 . The thread adjusting device 70 mainly has: a thread adjuster 79 which applies thread tension to the upper thread; adjust.

The thread regulator 79 is provided on the right side of the sewing machine arm 101a, and holds the upper thread on the path from the thread supply source to the scale 142 to apply thread tension. This thread adjuster 79 has: two thread regulating discs 72, 72, which clamp the upper thread; a hollow support shaft 73, which supports the aforementioned thread regulating discs 72, 72 so that they can move in the X-axis direction where they contact/separate from each other; Pressing shaft 74, which runs through the inside of hollow support shaft 73, can press one thread regulating disc 72 to the other thread regulating disc 72; thread taking spring 75; and main body housing 76, which accommodates and maintains the above structure.

On the other hand, on the left side of the wire regulator 71, an output shaft 71a that generates thrust in a protruding direction according to the value of the energized current is arranged, and the output shaft 71a is on the same straight line as the pressing shaft 74. arrangement.

And the output shaft 71a is coupled with the transmission shaft 78 inserted in the coil spring 77, and this transmission shaft 78 is inserted in the coil spring 77, and this coil spring 77 presses the output shaft 71a in the direction which pushes back.

Therefore, when the on-line adjustment solenoid 71 is not energized, the output shaft 71a is pushed back by the coil spring 77, and the pressing force to press the pressing shaft 74 toward the line adjustment disc 72 cannot be obtained, so the two line adjustment discs 72, 72 is free, and no thread tension is applied.

In addition, when the wire adjustment solenoid 71 is energized, the output shaft 71a is protruded by a thrust corresponding to the current value, and the transmission shaft 78 presses one wire adjustment dial 72 via the pressing shaft 74 against the coil spring 77, thereby According to this pressing force, thread tension can be applied to the upper thread inserted between the two thread adjustment disks 72 , 72 .

In addition, the amount of energization of the thread regulating solenoid 71 is controlled by the control device 90 , and an arbitrary thread tension can be applied to the upper thread by the thread regulating device 70 .

In addition, the control device 90 as the control unit controls the thread adjustment solenoid 71 as the actuator for adjusting the thread tension so that when the needle movement of winding up the thread or a plurality of needle movements including the movement is performed, When the moving direction of the material is within the angle range of A or B, adjust the thread tension to decrease.

[cutter needle]

11(A) shows a front view of the cutter needle 11 at the reference position, FIG. 11(B) shows a side view of the cutter needle 11 at the reference position, and FIG. 12 shows a top view of the cutter needle 11 at the reference position.

The cutter needle 11 is a flat cutter needle, and its tip 112 is formed flat and sharp. The cutter needle 11 is different from a sewing needle having a substantially circular cross section, and has substantially elongated needle entry holes, such as inline, rhombic, or crescent-shaped needle entry holes.

Then, as shown in FIG. 12 , when the cutter needle 11 is at the reference position, the needle eye 11 a is aligned in the Y-axis direction, and the flat front end portion 112 is aligned in the X-axis direction. As described above, the cutter needle 11 whose tip portion 112 is perpendicular to the needle eye 11a is called a horizontal cutter. In addition, the symbol C in the drawing represents the centerline of the cutter needle 11 .

In addition, when the cutter needle 11 is located at the reference position, one end of the needle eye 11a faces the operator side (front side), and the other end of the needle eye 11a is cut flat. If one end side of the needle eye 11a is defined as the front side 113, and the other end side of the needle eye 11a is defined as the cutting side 114, then the upper thread U pulled out from the upper thread supply source is drawn from the front side of the needle eye 11a of the cutter needle 11. 113 inserts toward cutting side 114, and reaches cloth.

With the cutter needle 11 at the reference position, the kettle 13 is arranged on the cutting side 114 of the cutter needle 11, and the upper thread loop is caught by the kettle 13 from the cutting side 114 of the cutter needle 11. That is, the reference position refers to the direction in which the cutting side 114 faces the kettle 13 and the needle loop is caught by the kettle 13 .

And, when the needle rotation of the cutter needle 11 is performed, the top dead center (upper axis angle 0°) of the needle bar 12 is in a state toward the reference position, the needle bar 12 starts to descend, and the front end of the cutter needle 11 Before the upper part reaches the cloth, the needle bar 12 is rotated up to the target rotation angle, and returns to the reference position before the bottom dead center of the needle bar 12 (upper axis angle 180°), and then the upper thread U is caught by the kettle 13 to form thread knot.

[Sewing machine control system: control device]

FIG. 13 is a block diagram showing a control system of the sewing machine 100 . The sewing machine 100 has a control device 90 as a control unit for controlling the operations of the above-mentioned various parts and components. And, control device 90 has: ROM 92, it stores the program that is used for the motion control in sewing; RAM 93, it becomes the operation area of operation processing; Sewing data; And CPU 91, it executes the program in ROM 92.

In addition, the CPU 91 passes through the sewing machine motor drive circuit 21a, the X-axis motor drive circuit 83a, the Y-axis motor drive circuit 84a, the thread winding motor drive circuit 52a, the needle bar rotation motor drive circuit 34a, and the thread adjustment solenoid drive circuit 71b, Connect with the sewing machine motor 21, the X-axis motor 83, the Y-axis motor 84, the motor 52 for pulling up the thread, the needle bar rotating motor 32 and the thread regulating solenoid 71, and control each motor 21, 83, 84, 52, 32 and thread The drive of the solenoid 71 is regulated.

In addition, an operation panel 95 as a setting unit is connected to the CPU 91 via an interface 95a, and the operator can input various settings.

In addition, the sewing machine motor 21 has an encoder not shown, and outputs the detected angle to the CPU 91. In addition, each of the above-mentioned motors 83, 84, 52, and 34 is a stepping motor, and the above-mentioned unillustrated origin search unit is connected to the CPU 91, and the CPU 91 can recognize the origin position of each motor based on its output.

In the sewing data stored in the data memory 94, the operation amounts of the X-axis motor 83 and the Y-axis motor 84 for sewing each needle of a predetermined sewing pattern are sequentially stored. The operation amounts of the X-axis motor 83 and the Y-axis motor 84 are read one stitch at a time, and operation control of driving the X-axis motor 83 and the Y-axis motor 84 according to the respective operation amounts is performed. That is, the control device 90 controls the cloth moving mechanism 80 based on sewing data specifying the needle drop position or the cloth moving amount for each stitch for forming a predetermined sewing pattern.

In addition, the sewing data may be data in which the position coordinates (XY coordinates) of the needle entry positions for each stitch for sewing a predetermined sewing pattern are recorded. In this case, the control device 90 performs operation control of calculating the operation amounts of the X-axis motor 83 and the Y-axis motor 84 for each stitch after each needle drop based on each position coordinate, and driving the X-axis motor 83 and Y-axis motor 84 .

[Causes of winding stitches]

The above-mentioned CPU 91 executes wrapping stitch avoidance control along with execution of the sewing control based on the above-mentioned sewing data. There are 2 reasons for wrapping stitches.

First, as the first reason, the direction in which the upper thread U is wound toward the cutter needle 11 is mentioned. When the cloth moving mechanism 80 makes the cloth move in any direction corresponding to the sewing data for each needle, the cutting needle 11 passes through the needle when piercing the cloth according to the cloth feeding direction, that is, the direction in which the stitches are formed. The direction in which the upper thread U of the needle eye 11a of the knife needle 11 is wound with the knife needle 11 is left-hand winding (FIG. 14(A)) or right-hand winding (FIG. 14(B)). This becomes 1 reason for deciding whether to be an ideal stitch or a wrapping stitch.

In addition, as a second reason, the needle entry position with respect to the path of the lower thread D is mentioned. As shown in FIG. 3 above, in a state where the lower thread D is transferred from the corner portion of the bobbin housing 134 of the kettle 13 to the needle hole 15 of the needle plate 14, the needle drop position with respect to the path of the lower thread D makes the cutter needle 11 Drop the needle on one of the left L and right R. This becomes 1 reason for deciding whether to be an ideal stitch or a wrapping stitch.

FIG. 15 shows a state in which the angular range of the cloth moving direction of the cloth moving mechanism 80 is divided into four states of A to D with the needle hole 15 at the center corresponding to the combination of the above-mentioned first cause and second cause. . FIG. 16 shows whether wrapping stitches are generated in each range shown in FIG. 15 , and which of the above-mentioned causes corresponds to the cause.

First of all, the angular range of the moving direction of the cloth in A is that when the cloth is conveyed in the direction of this angular range, since the lower thread is roughly consistent with the direction from the bobbin housing to the needle hole 15, it is uncertain relative to the direction of passing through the needle hole 15. In the lower thread, whether the cutter needle 11 falls on the right side or on the left side, the reason for wrapping stitches may occur. On the other hand, in this region, due to the moving direction of the cloth, the upper thread is reliably on the right side with respect to the winding direction of the cutter needle 11, and does not become the cause of the winding stitches. Therefore, the direction of cloth movement of A is the area where both ideal stitches and wrapping stitches are likely to be produced.

Next, the angular range of the cloth moving direction of B, if the cloth is conveyed in the direction of this angular range, the falling side of the cutter needle 11 will reliably become The left side, and, for this area, the winding direction of the upper thread with respect to the cutter needle 11 becomes the right side due to its cloth moving direction. In this case, the cause of the wrapping stitches is that the cloth moving direction of B is the region where the wrapping stitches are made.

Next, in the range of the moving direction of the cloth in C, if the cloth is fed in the direction of this angular range, the falling side of the cutter needle 11 is reliably on the left side with respect to the lower thread path connected from the kettle (bobbin housing) to the needle hole 15. side, it does not become the cause of wrapping stitches. On the other hand, since the winding direction of the upper thread with respect to the cutter needle 11 is uncertain, it may cause wrapping stitches. Therefore, the cloth movement direction of C is the area where both ideal stitches and wrapping stitches can be produced.

In the range of the moving direction of the cloth in the remaining D, if the cloth is fed in the direction of this angular range, the falling side of the cutter needle 11 will reliably become the right side with respect to the lower thread path connected from the kettle (bobbin housing) to the needle hole 15. The winding direction of the upper thread relative to the cutter needle 11 becomes the left side. Since wrapping stitches do not occur, the cloth moving direction of D is an ideal stitch area.

[Control device: winding stitch avoidance control]

As mentioned above, in the sewing machine 100, whether it is an ideal stitch or a winding stitch is determined by the position where the cutter needle 11 falls relative to the lower thread path connected to the needle hole 15 from the kettle (bobbin housing) and the upper thread. These two factors are determined jointly by the winding direction of the cutter needle 11, and the type of stitches also tends to be indeterminate in areas where the respective causes are indeterminate.

Therefore, in the case where the purpose is only to avoid wrapping stitches, for the above-mentioned four angular ranges A to D in the cloth moving direction by the cloth moving mechanism 80, as shown in FIG. In the case of moving the cloth in the angular range B, the thread winding mechanism 50 may be used to wind up the thread, and in the case of moving the cloth in the angular range C, the needle bar rotation mechanism 30 may be used to rotate the needle bar. In addition, the rotation direction and rotation angle of the needle bar 12 in this case may be about 45° counterclockwise from the reference position.

Therefore, the control device 90 stores, in the data memory 94, thread winding driving data representing the numerical ranges of the angular range A and the angular range B, and the moving direction of the cloth by the cloth moving mechanism 80 based on the sewing data is in the angular ranges A and B. In the case of being within the numerical range of , the control is to execute the thread winding action by the thread winding mechanism 50 .

That is, the angle ranges A and B correspond to the "predetermined thread winding angle range", and the angle range C corresponds to the "predetermined thread winding direction change angle range".

[Cutter needle angle correction control]

On the other hand, since this sewing machine 100 uses the cutter needle 11 as a sewing needle, it is necessary to implement the cutter needle angle correction control for the action control of the needle bar rotating mechanism 30 while avoiding wrapping stitches, that is, the The cutter needle angle correction control is used to form inclined needle drop holes in the direction corresponding to the direction of material movement.

Since the cutter needle 11 of the sewing machine 100 of this embodiment is a flat cutter type, a straight needle drop hole is formed on the cloth. For example, in order to control the needle bar turning mechanism 30 so that as shown in FIG. 17, the inline-shaped needle drop hole h is inclined clockwise with respect to the moving direction F of the cloth, it is necessary to perform a determination cut as shown in FIG. The angle control of knife needle 11.

In addition, the direction of the needle entry hole h shown here is an example and can be changed arbitrarily. In the case of a change, it is preferable to use another cutter needle having a different orientation of the straight needle entry hole formed with respect to the reference position.

In this FIG. 18 , a rectangular sewing pattern whose two sides are respectively parallel to the X-axis direction and the Y-axis direction is shown as an example.

In the movement of the material in the f1 direction (90° when the front is 0°) of the sewing pattern of FIG. 18 , the cutter needle 11 is inclined 45° When the needle is dropped in the direction of °, the knife needle 11 moves in the counterclockwise direction (reverse ) in an inclined direction of 45°, the knife needle 11 moves clockwise with respect to the above-mentioned reference position during the movement of the material in the f3 direction of the sewing pattern (270° when the front is set to 0°). The needle drop is performed at an inclined direction of 45°, and the knife needle 11 is inclined counterclockwise with respect to the above-mentioned reference position during the movement of the material in the f4 direction of the sewing pattern (0° when the front is set to 0°). Needle drop at 45° orientation.

As mentioned above, in order to form the needle drop holes h inclined in the same direction with respect to any material moving direction F, it is only necessary to be in the range of ±45° (the clockwise direction is regarded as the positive direction, and the counterclockwise direction is regarded as the opposite direction). Make needle bar 12 rotate and get final product.

Therefore, as shown in FIG. 19, the cloth moving direction range of ±45° centered on the above-mentioned f3 direction is used as the first angle range (45°-135°), and the range of ±45° centered on the above-mentioned f4 direction The cloth moving direction range is the second angle range (135° to 225°), and the cloth moving direction range of ±45° centered on the above-mentioned f1 direction is used as the third angle range (225° to 315°). The cloth moving direction range of ±45° with the f2 direction as the center is defined as the fourth angle range (315°-45°).

In addition, the control device 90 rotates the needle bar 12 clockwise by 45° when the cloth moving direction is included in the first angle range, and rotates the needle bar 12 in the clockwise direction when it is included in the second angle range. Rotate 45° counterclockwise. If it is included in the third angle range, turn the needle bar 12 clockwise by 45°. If it is included in the fourth angle range, turn the needle bar 12 counterclockwise. Orientation turned 45°.

Thus, even when the cloth moving direction is changed according to the sewing pattern, the needle drop hole h can be formed in a state always inclined clockwise with respect to the cloth moving direction, and the needle drop hole can be maintained at the same level as the sewing pattern. Stitches are formed at the same time as the orientation corresponding to the change of the cloth moving direction.

In addition, the values of the rotation angles of the needle bar 12 in the first to fourth angle ranges can be arbitrarily set by the operation panel 95 as the setting means.

In addition, the second angle range including the f4 direction includes the entire area of the angle range C (refer to FIG. 15 ) in which wrapping stitches should be avoided by the above-mentioned rotation of the needle bar. However, if the direction of rotation and the angle of rotation of the needle bar 12 relative to the reference position coincide with the direction of rotation and angle of rotation of the needle bar 12 for avoiding wrapping around the stitches, then it is possible to form a direction corresponding to the stitch formation direction. Needle drop holes while avoiding wrapping stitches.

As described above, when the cloth is moved to the angular range C, the needle bar 12 may be rotated 45° counterclockwise by the needle bar rotating mechanism 30 in order to avoid wrapping stitches. In the second angle range, since the slanted needle drop hole h is formed by rotating the cutter needle 11 counterclockwise by 45°, it coincides with the rotation direction and rotation angle of the needle bar 12 for avoiding wrapping stitches. Therefore, in the second angle range, it is possible to realize both formation of the needle drop hole facing the direction corresponding to the stitch formation direction and avoidance of wrapping stitches.

Furthermore, the control device 90 executes the following operation control when sewing is performed. That is, if the operation amounts of the X-axis motor 83 and the Y-axis motor 84 corresponding to one needle are read from the sewing data in order to sew a predetermined sewing pattern, the movement amount in the X-axis direction and the Y-axis direction will be , to determine whether the moving direction of the cloth belongs to the angle range A and the angle range B. In addition, at the same time, it is determined which of the first to fourth angle ranges the moving direction of the cloth belongs to.

And, when the moving direction of the cloth belongs to the angle range A or the angle range B, the thread-winding motor 52 of the thread-winding mechanism 50 is controlled to perform the thread-winding action to avoid wrapping stitches.

In addition, when the moving direction of the cloth belongs to the first or third angle range, the needle bar turning motor 32 of the needle bar turning mechanism 30 performs a 45° needle bar turning action in the clockwise direction to form an angle relative to the moving direction of the cloth. Needle drop hole h inclined clockwise. In addition, in the case of the second or fourth angle range, the needle bar is rotated counterclockwise by 45° to form the needle drop hole h inclined clockwise with respect to the cloth moving direction. In addition, the second angle range includes the angle range C in the winding stitch avoidance control, but in order to form the inclined needle drop hole h, the needle bar 12 is rotated counterclockwise by 45°, so avoiding the angle range C. Around stitches.

[Control device: Execution timing regarding needle bar rotation]

Next, a description will be given of an appropriate timing when performing the needle bar rotation in the cutter needle angle correction control. FIG. 20 is a graph showing the relationship between the upper axis angle and the height of the cutter needle 11 .

Indicated in Figure 20

a interval: the ascending interval when the needle point is pulled out from the sewing object until it reaches the top dead center of the needle bar,

b interval: the descending interval from the top dead center of the needle bar until the needle point reaches the sewing object,

c section: the descending section from when the needle point reaches the sewing product until it reaches the bottom dead center of the needle bar,

d interval: the ascending interval from the bottom dead center of the needle bar until the needle coincides with the kettle tip,

e interval: the ascending interval from when the sewing needle coincides with the tip of the kettle until the sewing needle is pulled out from the sewing object.

In order to form the inclined needle drop hole h, the rotation of the needle bar requires that the direction of the cutter needle 11 be rotated by a necessary angle before reaching the needle penetration angle in FIG. 20 . Therefore, the needle bar rotation motor 32 of the needle bar rotation mechanism 30 is controlled so as to start driving at least earlier than the timing at which the needle penetration angle is reached, the required time for making the needle bar 12 Time required to turn 45°.

In addition, the upper shaft angle is monitored by the output of an encoder provided on the sewing machine motor 21 .

In addition, the orientation of the cutter needle 11 needs to return to the original orientation (reference position) at least before reaching the upper axis angle consistent with the needle hub, preferably before reaching the upper axis angle at the bottom dead center of the needle bar. Therefore, the needle bar rotating motor 32 of the needle bar rotating mechanism 30 is controlled so as to start driving at least earlier than the timing of the upper shaft angle at the bottom dead center of the needle bar. In the required time to make the needle bar 12 rotate 45°.

[control device: about the execution timing of thread winding]

Next, a description will be given of an appropriate timing in the case of executing thread pick-up in wrapping stitch avoidance control. FIG. 21 is a movement diagram of the cutter needle 11, the kettle 13, and the balance 162 in the sewing machine 100. FIG. The line marked with ▲ in FIG. 21 represents a needle bar curve, the line marked with ■ represents a pot curve, and the line marked with ◆ represents a balance curve. In addition, FIG. 22 and FIG. 23 are top views showing the positional relationship between the thread gathering member 51 and the needle hole 15. FIG. 22 shows a state where thread gathering is not performed, and FIG. 23 shows a state where thread gathering is performed.

As shown in Fig. 22 and Fig. 23, since the thread gathering part 51 crosses the needle hole 15 which becomes the needle drop position, so in the execution of thread gathering, for the rotation of the outward path of the thread gathering part 51, it is preferable that the needle piercing angle is Before the upper shaft angle of 113°, the rotation of the outlet of the wire wrapping part 51 is completed. Therefore, the motor 52 for winding the thread of the thread winding mechanism 50 is controlled so as to start driving at least earlier than the timing at which the needle piercing angle is reached. The time required for the standby position in the immovable section 532 to reach the stop position in the immobile section 533 .

In addition, for the rotation of the circuit of the thread gathering member 51, it is preferable to perform the rotation of the circuit of the thread gathering member 51 when the upper thread is released by the kettle and becomes the upper shaft angle of 270° which is the upper thread release angle farthest from the center of the sewing needle. Therefore, the thread-winding motor 52 of the thread-winding mechanism 50 is controlled and started to drive so that the timing of moving from the immovable section 533 of the thread-winding cam member 53 to the action section 534 is the same as the upper thread release angle (upper shaft angle 270°). ) consistent.

The rotation action of the wire gathering parts 51 requires that both the forward and the return paths are operated at a shorter timing, but since the wire gathering motor 52 reaches the action zone 534 at a high speed after the motor 52 is assisted in the immovable zone 532 or 533, it is possible to make the yarn gathering The member 51 rotates at a high speed and can sufficiently respond to a request for operation at a short timing.

As shown in FIG. 24, if thread winding is performed, the lower thread is pulled up by the thread winding part 51, and the path length increases, and is pulled out from the bobbin side.

Therefore, even if the needle thread tension is set lower than usual, the knots of the upper and lower threads can be pulled up toward the upper side of the fabric, and good stitches can be formed with low tension.

Therefore, when it is determined that the needle drop of the thread gathering is performed during sewing, the control of the thread adjusting solenoid 71 is executed so as to reduce the thread tension.

At this time, the thread tension of the thread regulating solenoid 71 can be automatically reduced by a predetermined amount by calculating the set value of the thread tension set in the sewing data, or can be automatically calculated by reducing it by a predetermined ratio. Alternatively, the thread tension value suitable for thread wrapping execution may be set in advance, and the thread adjustment solenoid 71 may be controlled in such a manner that the thread tension value suitable for thread wrapping execution is similarly obtained during thread wrapping execution.

As described above, by performing control to reduce the thread tension during thread wrapping, it is possible to equalize the thread tightness of stitches where thread wrapping is performed and stitches that are not executed.

[Description of operation of winding stitch avoidance control and cutter needle angle correction control]

Fig. 25 is a flowchart of wrapping stitch avoidance control. As shown in the figure, when the control device 90 of the sewing machine 100 performs sewing based on the sewing data, when the rotation angle (phase) of each rotation of the upper shaft is a predetermined read-in angle, the sewing data is executed based on the sewing data. Reading of the movement amount in the X-axis direction and the Y-axis direction of the next hand movement (step S1).

Then, the cloth moving direction is calculated from the moving amounts in the X-axis direction and the Y-axis direction (step S3).

Then, the control device 90 refers to the numerical ranges of the angular range A and the angular range B stored in the above-mentioned data memory 94 to determine whether the calculated cloth moving direction belongs to the angular range A or B (step S5).

As a result, when the moving direction of the cloth falls within the angle range A or B, the thread adjustment solenoid 71 is controlled so that the thread tension becomes smaller than the set value or becomes a predetermined low tension value. (step S7).

And whether cloth moving direction belongs to the first angle range is judged (step S9), under the situation that belongs to, the upper axis angle is monitored, and the driving of the winding motor 52 is started at an appropriate timing, and the winding is carried out. Then, the driving of the needle bar rotation motor 32 is started at an appropriate timing, and the needle bar 12 is rotated by 45° in the clockwise direction (step S11).

In addition, when the moving direction of the cloth does not belong to the first angle range, the upper shaft angle is monitored, and the driving of the winding motor 52 is started at an appropriate timing to perform winding, and the needle bar is moved at an appropriate timing. The driving of the rotation motor 32 is started, and the needle bar 12 is rotated by 45° in the counterclockwise direction (step S13).

Then, the operations of the wrapping stitch avoidance control and the cutter needle angle correction control are terminated.

On the other hand, in step S5, if the calculated cloth moving direction does not belong to any one of the angle ranges A or B, it is determined whether the cloth moving direction belongs to the first or third angle range (step S15) . If so, the upper shaft angle is monitored, and at an appropriate timing, the driving of the needle bar rotating motor 32 is started to rotate the needle bar 12 clockwise by 45° (step S17).

In addition, when the moving direction of the cloth does not belong to the first or third angle range, the angle of the upper shaft is monitored, and the driving of the needle bar rotating motor 32 is started at an appropriate timing, so that the needle bar 12 is rotated 45 degrees counterclockwise. ° (step S19).

Then, the operations of the wrapping stitch avoidance control and the cutter needle angle correction control are terminated.

[Effect of Embodiment]

As described above, in the sewing machine 100, the thread winding is performed within the thread winding angle range, and the needle bar rotation is performed within the thread winding direction changing angle range, so wrapping stitches can be avoided.

And, since the rotation angle of the needle bar 12 can be adjusted from the reference position to the forward and reverse directions by the needle bar rotation mechanism 30, the rotation angle of the needle bar 12 can be adjusted arbitrarily in a wide range, and the needle bar can be rotated. The rotation mechanism is applied to the knife needle angle correction control for appropriately adjusting the orientation of the knife needle 11 corresponding to the moving direction of the cloth.

In particular, in the sewing machine 100, the cloth moving direction by the cloth moving mechanism 80 is divided into the first to fourth angle ranges, and the second angle range includes the angle range C as the angle range for changing the thread winding direction. Both the stitches of the cutter needle 11 and the wrapping stitches are avoided.

In addition, since the rotation angles of the needle bars determined for the first to fourth angle ranges are determined so that the direction of the needle drop hole formed by the cutter needle 11 is within a fixed angle range with respect to the moving direction of the cloth, it is possible to The orientation of the stitches of the cutter needle 11 is more appropriate.

[other]

In the above-mentioned embodiment, cloth is exemplified as the to-be-sewn object, but it is not limited to this, and any sheet-like material such as leather that can be moved may be used as the to-be-sewn object.

In addition, in the sewing machine 100 described above, the cloth moving direction is divided into the first to fourth angle ranges, and the rotation angle of the cutter needle 11 is determined as a fixed value in this angle range. Therefore, for example, in the range of 45° to 90°, similarly, the cutter needle 11 becomes in the same direction, and the direction of the needle drop hole becomes a fixed angle range with respect to the cloth moving direction, but in order to further narrow the angle range, The angle range can be divided more finely than the first to fourth angle ranges. Thereby, even when the cloth moving direction is any direction, the direction of the needle drop hole with respect to the cloth moving direction can be made more uniform, and sewing can be suitably performed.

In addition, in the sewing machine 100 described above, a semi-rotary kettle was exemplified as the kettle, but the type of the kettle is not limited thereto. Any tank such as a full rotary tank or a horizontal tank can also be used, but since the values of the angle ranges A to D vary, it is preferable to conduct experiments for each tank type to obtain an angle range and set an appropriate value.

In addition, in the needle bar turning mechanism 30, a belt mechanism is used to impart a turning motion from the needle bar turning motor 32 to the needle bar 12, but the present invention is not limited thereto. For transmitting the rotational movement from the needle bar rotating motor 32 to the needle bar 12, it is also possible to use an action applying mechanism that can freely and well perform forward rotation and reverse rotation, such as a gear mechanism, or use a needle bar rotating table 31 is a structure in which the output shaft of the needle bar rotating motor 32 is directly connected.

In addition, a knife needle is exemplified as a sewing needle, but as long as it is a sewing needle having a fixed shape and a needle drop hole having a directional shape with respect to the cloth moving direction, even a normal sewing needle can be applied to the above-mentioned sewing machine. In addition, the substantially long hole shape is not limited to a straight shape, and may be a polygon, an oblong shape, or other shapes other than a perfect circle. Also, it is more preferable if it is long in a fixed direction and has the same shape even if it is rotated by 180°.

Claims (6)

1. a Sewing machines, it has:

Needle bar, it keeps suture needle, moves up and down;

Still, it is made by rotational action to reach the standard grade and to be wound around with rolling off the production line;

Sewing machine electromotor, it is as the drive source moved up and down of described needle bar;

Needle bar rotating mechanism, it makes described needle bar around axis rotation along the vertical direction;

Hold together line mechanism, what its downside at needle plate utilized line parts to carry out rolling off the production line holds together line;

Travel mechanism, it makes sewn object move to arbitrary cloth moving direction along the horizontal plane, and carries out falling pin;

Control part, it is based on stitch data, to described travel mechanism, described needle bar driving mechanism and described in hold together line driving mechanism and control, this stitch data defines the needle downing position of each pin of tailoring pattern for the formation of regulation or the amount of movement of the described sewn object of each pin

The feature of this Sewing machines is,

Described suture needle is the cutting knife pin described sewn object being formed to the needle falling hole of roughly elongated hole-shape,

Described needle bar can be carried out angular adjustment from reference position by described needle bar rotating mechanism in forward and reverse direction,

Described control part, corresponding with described cloth moving direction and perform and utilize the rotation of the described needle bar of described needle bar rotating mechanism to control, the stitching that the needle tracking formed one by one has arbitrary angle of inclination relative to the cloth moving direction of described sewn object and is associated

Further, described control part, when described cloth moving direction be predetermined hold together line angular range, perform hold together line mechanism described in utilizing hold together line traffic control.

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

Described control part, is divided into multiple angular range by the cloth moving direction utilizing described travel mechanism to carry out the movement of described sewn object, determines the rotational angle of described needle bar for the plurality of angular range respectively, and,

Belong to which of described multiple angular range according to based on respectively falling of described stitch data for the described cloth moving direction of answering, described needle bar rotating mechanism is controlled, to become the rotational angle determined for this angular range.

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

Described control part, when described cloth moving direction is predetermined line winding direction change angular range, performs and utilizes the rotation of the described needle bar of needle bar rotating mechanism to control, to become predetermined rotational angle,

In described multiple angular range, at least 1 angular range includes described line winding direction and changes angular range.

4. the Sewing machines according to Claims 2 or 3, is characterized in that,

Each and the rotational angle of the described needle bar determined corresponding to described multiple angular range are defined as, and the angle of inclination of the needle falling hole of the described elongated hole-shape that described cutting knife pin is formed all becomes in fixing angular range relative to any described cloth moving direction.

5. the Sewing machines according to Claims 2 or 3, is characterized in that,

Have setup unit, this setup unit at random sets the rotational angle of the described needle bar of each corresponding to described multiple angular range.

6. Sewing machines according to claim 4, is characterized in that,

Have setup unit, this setup unit at random sets the rotational angle of the described needle bar of each corresponding to described multiple angular range.