JP2004141652A - Buttoning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buttoning machine, for performing favorable sewing without any skip stitch by preventing a needle from being lowered between handled threads in the case where the moving direction of a needle location is pointed along the thread handling direction at the time of reciprocating between a button and cloth to perform wind thread shank. <P>SOLUTION: In performing wind thread shank by reciprocation between the button and the cloth, in the case where the needle location is performed along the thread handling direction having the possibility of causing skip stitch failure, a feed pitch is adjusted to prevent the skip stitch failure. On the contrary, in the case where the needle location is performed in the opposite direction to the thread handling direction, there is no possibility of skip stitch failure, so a seam is formed by the feed pitch of ordinary wind thread shank to surely produce a beautiful wind thread. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a root-wound button sewing machine which sews a button to fabric such as men's and women's clothing by chain stitching, and more particularly to a sewing machine which prevents skipping by a thread puller at the time of root-wound sewing.

As described in JP-A-3-5895, JP-A-6-296775, and JP-A-6-327859, a sewing machine with a button is used to hold a button holding a button by starting the sewing machine. After forming the root thread (sewing to sew the button on the fabric) with the predetermined number of stitches by XY movement, the sewing machine stops automatically, then raises the button and then starts the sewing machine again, so that the root winding with the predetermined number of stitches ( This sewing machine is capable of performing a cycle sewing in which a series of operations for automatically stopping after forming a root thread (sewing involving a root thread) are performed.
In a button sewing machine of this type, a thread pulling device as described in, for example, JP-A-11-19361 is provided. 14 to 17 show a conventional thread pulling device, in which the needle 1 performs a needle swinging motion to move up and down in conjunction with a sewing machine driving motor (not shown). The workpiece 2 can be moved in the left-right direction together with a cloth guide (not shown).
JP-A-3-5895 JP-A-6-296775 JP-A-6-327859 JP-A-11-19361

The looper 4 interlocks with the sewing machine drive motor, and picks up the sewing thread 5a, 5b when the needle 1 that moves up and down reaches a position slightly passing through the bottom dead center. The V-shaped thread puller 6a and the thread puller 6 provided with a ridge line 6b at the deepest portion thereof are described in detail immediately before the needle 1 ascends through the bottom dead center and reaches the bottom dead center again. At the timing when the tip of the needle 1 shown in FIGS. 15 and 16 approaches a position immediately before passing over the upper surface of the thread puller 6, the thread puller 6 is viewed from the front and leftward (in the direction of arrow X in FIG. 15). , The two sewing threads 5a and 5b passed between the sewn object 2 and the looper 4 are hooked at the thread shifting portion 6a at the tip thereof, and the sewing thread is moved along the inclined surface of the thread shifting portion 6a. 5a and 5b are moved and gathered to the ridgeline 6b. Normally, the operation of the thread puller 6 is performed by following a cam driven in conjunction with a sewing machine drive motor.

At this time, the two sewing threads 5a and 5b gathered are inclined with respect to the vertical movement path of the needle 1 as shown in FIG. Then, the upper portions of the two sewing threads 5a and 5b are brought closer to each other, and displaced to the side (Y1 direction in FIG. 14) of the vertical movement path of the needle 1 due to the inclination of the thread puller 6a. This prevents the needle 1 from falling between the two sewing threads 5a and 5b.

In the above-mentioned sewing machine, the needle is passed through the button hole and the button is sewn to the cloth. Then, the root thread (button thread) passed between the button and the cloth. Root-wrap sewing is performed to form a seam so that a sewing thread is wound.
FIG. 17 shows root winding sewing, in which the button BT and the folded fabric 5e are integrally moved relative to the needle 1 that moves up and down and the thread puller 6 that moves leftward in the figure when the thread is pulled, The needle 1 forms a plurality of stitches (root-wrapped stitches) along the extension direction of the root thread 2a while traversing the root thread 2a for each stitch, so that the root-wrap wound with the root-thread 2a by the root-wrap thread 5c is formed. Form.

送 り The feed pitch at the time of root winding sewing is set small so that the root winding thread 5c is in close contact. At this time, the sewing thread 5a, 5b hooked on the tip side of the thread pulling portion 6a is moved in the Y1 direction along the slope of the thread pulling portion 6a by the movement of the thread pulling tool 6 to the left as described above. When the root winding stitch forming direction at the time of sewing moves along the Y1 direction, that is, when root winding stitching is performed from the button side toward the fabric, as shown in FIG. In some cases, the needle 1 was lowered during the period 5b, resulting in stitch skipping.

The present invention has been made in view of the above circumstances, and when performing root winding stitching, when performing the root winding stitching in a direction along the yarn pulling direction, that is, when performing the root winding stitching from the button side to the fabric. It is an object of the present invention to provide a sewing machine with a button that can perform good sewing without skipping by preventing the needle from falling between the threads.

In order to achieve the above object, a button sewing machine according to claim 1 of the present invention includes a needle that moves up and down, a looper that picks up a loop of a sewing thread when the needle reaches a bottom dead center and starts rising. Immediately before the needle reaches the bottom dead center, the middle part of the two sewing threads spanned between the cloth and the looper is moved in a predetermined shifting direction (X direction) to move the needle from the reciprocating path of the needle. A driving means (X motor) for relatively moving the needle puller (10) to be retracted, the holding body holding the fabric and the button, the needle, the yarn pulling tool, and the holder in the XY direction for each needle. 22, a Y motor 23, and a needle swing motor 25). After the button sewing, which is performed between the cloth and the button hole of the button, the driving unit is driven to drive the cloth and the button by the button sewing. Needle drop sequentially on both sides of the root thread passed between In the button-attached sewing machine which performs rewinding sewing at a predetermined feed pitch along the extension direction of the root thread at the needle drop position, the root winding is performed from the fabric side to the button at the time of the root winding sewing. And control means for driving the driving means so as to change the feed pitch per stitch when performing root winding sewing from the button side toward the fabric.

In the sewing machine with a button according to claim 1, the per-needle feed when the root winding is performed from the fabric side to the button at the time of the root winding sewing and when the root winding is performed from the button side to the cloth. Since the drive means is driven with changing the pitch, when the needle falls along the line pulling direction which may cause stitch skipping when reciprocating between the button and the fabric and wrapping the root Adjust the feed pitch to prevent stitch skipping, and in the case of needle dropping in the opposite direction to the thread pulling direction, there is no possibility of stitch skipping. By forming, there is an effect that beautiful root winding can be surely achieved.

In the button sewing machine according to a second aspect of the present invention, the sewing direction of the root winding stitching when reciprocating the needle drop position along the passing direction of the root thread is such that the sewing direction of the sewing thread is shifted in the direction along the sewing direction of the thread puller. In such a case, the feed pitch is set to a moving amount of the needle exceeding a sewing thread moved by the thread moving device.

In the sewing machine with a button according to claim 2, in the case of root winding sewing, when a needle falls in a direction along a direction in which a sewing thread is moved by the thread puller, a feed pitch of the needle is adjusted by the needle. By setting the movement amount to exceed the sewing thread that has been shifted, the stitch skipping defect can be completely eliminated.

The sewing machine with a button according to a third aspect of the present invention is configured such that, when the sewing direction of the root winding sewing that reciprocates at the needle drop position along the passing direction of the root thread is a direction along the direction in which the sewing thread is moved by the thread puller. Is such that the feed pitch can be arbitrarily changed. In the sewing machine with a button according to the third aspect, the appearance of the root winding sewing is improved by adjusting the feed pitch of the sewing thread to a minimum amount of movement exceeding the sewing thread pulled by the thread puller in accordance with the type of the sewing thread. effective.

According to a fourth aspect of the present invention, there is provided a button sewing machine in which root winding sewing is performed a plurality of times so as to reciprocate at a needle drop position along the passing direction of the root thread.
In the sewing machine with a button according to the fourth aspect, the root winding stitch is reciprocated a plurality of times so that even if the thread end of the root thread protrudes from between the stitches of the first root winding stitch, a plurality of the root winding stitches are formed. By reciprocating twice, the protruding thread end can be completely wound around the seam, and a very high-quality thread can be wound.

In the sewing machine with a button according to a fifth aspect of the present invention, the needle is dropped a plurality of times at the cloth-side end when the needle drop position is reciprocated along the passing direction of the root thread during the root winding sewing. . Thereby, since the root winding thread is sewn to the cloth end side, the root winding thread does not shift to the button side, and there is an effect that a good-looking root winding can be maintained for a long time.
A sewing machine with a button according to claim 6 of the present invention includes a thread tensioner that can automatically change a thread tension to a set value, and reciprocates a needle drop position along a root thread passing direction during the root winding sewing. In this case, the thread tension can be changed a plurality of times. As a result, it is possible to increase the thread tension (thread tension) in accordance with the progress of the root winding sewing, and it is possible to perform firm root winding sewing.

In the sewing machine with a button according to claim 7 of the present invention, when the needle drop position is reciprocated a plurality of times along the root thread passing direction at the time of the root winding sewing, the swing width at the time of needle dropping on both sides of the root thread is the first time. The second drive is performed with a different width. Thereby, beautiful root wrap sewing can be obtained by making the swing width as small as possible.
The sewing machine according to claim 8, wherein the sewing speed of the sewing machine is different depending on the number of times of the plurality of times, when the root winding is formed by reciprocating a plurality of times along the passing direction of the root thread during the root sewing. It is characterized by being driven by.
A sewing machine with a button according to a ninth aspect is provided with a thread tensioner that can automatically change a thread tension to a set value, and varies the thread tension in accordance with a position where root winding sewing is formed. . As a result, it is possible to obtain a root winding stitch that is difficult to unravel.
According to a tenth aspect of the present invention, the sewing machine according to the tenth aspect is characterized in that the sewing speed of the sewing machine is driven at different speeds depending on the formation position of the root winding stitch. By adjusting the sewing speed in this manner, there is an effect that the risk of skipping can be reduced.

Hereinafter, an embodiment of a button sewing machine according to the present invention will be described with reference to the drawings.

In FIG. 2, the button BT and the fabric 5e are omitted.

In FIG. 1, a needle 1 reciprocates up and down in conjunction with a sewing machine main shaft (not shown) rotated by a sewing machine drive motor (not shown), and performs needle swing movement in X and -X directions as described later. .

Although not shown, as in the conventional sewing machine of this type, the holding member for holding the button BT moves the button BT and the cloth 5e to which the button BT is to be sewn in the needle swing direction (X, -X direction) and the needle swing direction. Are arranged so as to be movable in a direction (Y, -Y direction) intersecting with.

The looper 4 supported by a looper shaft (not shown) that rotates in conjunction with the main shaft of the sewing machine includes a first thread hooking portion 4a having a claw-shaped tip and a second threading portion 4a having a curved outer peripheral surface. It has a thread hook 4b and a shaft 4c fixed to the front end of the looper shaft. The looper 4 rotates counterclockwise so as to pick up a loop of the sewing threads 5a and 5b when the needle 1 reaches a position slightly raised after passing through the bottom dead center, and cooperates with the needle 1. To form a seam.

The thread puller 10 disposed between the needle plate (not shown) of the sewing machine and the looper 4 in the up-down direction is linked to the main shaft of the sewing machine, and at its deepest portion (prior art) just before the needle 1 reaches the bottom dead center. 2) moves along a substantially triangular movement locus in plan view as shown in FIG. That is, the movement from the point A to the point B in the direction of the arrow α (the + X direction), the movement from the point B to the point C the movement of the arrow β (the combined direction of the −X direction and the + Y direction), and the movement from the point C to the point A in the direction of the arrow γ (-Y direction) Movement is performed.
When the needle 1 descends, it advances in the α direction, and the two sewing threads (loop portions) 5 a and 5 b bridged between the cloth and the looper 4 are attached to the tip of a V-shaped thread pulling portion 11. The needle 1 is guided by the inclined surface of the thread holding portion 11 by the movement in the X direction and moves to the deepest portion 12 thereof, while acting toward the side (Y direction) of the lowered position of the needle 1, and When the needle 1 is raised, it is configured to retreat in the direction of arrow β. As a result, the two sewing threads 5a and 5b move in the Y direction along the root thread 2a passed between the button and the fabric.

{The control block circuit of the present invention will be described with reference to the block diagram of FIG. Reference numeral 20 denotes a CPU (corresponding to control means) for driving various motors, which will be described later, according to a program. Reference numeral 21 denotes a holder driving means for setting the button BT and the cloth 5e set on the holder at the button attaching position with respect to the needle 1 at the time of button sewing, which will be described later, and at the root winding sewing position at the time of root winding sewing. set.

保持 The holding body is supported by an X motor 22 and a Y motor 23 so as to be able to be driven XY by an XY feed mechanism (not shown) arranged in the sewing machine bed. The needle 1 is supported by a main motor 24 so as to be movable up and down, and can be moved in the X and -X directions by a needle swing motor 25. These motors 22, 23, 25 (corresponding to driving means) are driven by respective driving circuits in synchronization with a signal output from a main shaft sensor 26 which detects a rotation angle position of a main shaft rotated by the main motor 24. You.

Reference numeral 27 denotes a setting switch (corresponding to a setting means) for selecting a sewing pattern relating to button sewing and root winding sewing, inputting a thread approach direction, and setting the selected button sewing data. The amount, the length between the button BT and the cloth 5e at the time of root winding sewing, the feed pitch in the sewing direction (Y direction) from the cloth 5e to the button BT, and the sewing direction (−) from the button BT to the cloth 5e. The feed pitch at the time of (Y direction) can be set.
In particular, the feed pitch in the sewing direction (Y direction) toward the thread shifting direction is set to the feed pitch M1 of the close stitching, and the feed pitch in the sewing direction (-Y direction) opposite to the thread shifting direction is set to the close pitch. Set to M2 larger than the sewing. Further, it is possible to set the number of times of overlapping the root winding.
Reference numeral 28 denotes a start switch for instructing the start of sewing by operating an operation means such as a pedal.

# 29 is a storage means which stores in advance sewing data of a plurality of button attaching patterns including button attaching sewing data and root winding sewing data, and makes it possible to temporarily store the data set by the setting switch 27.

At the time of sewing, the button-attached sewing data and the root winding sewing data are read out, and the driving means 22, 23, and 25 are driven by the data to move the needle 1 and the holder relative to each other for each needle. Perform sewn and root wrap sewing.

When the start switch 28 is operated after the button BT and the cloth 5e are set on the holder, the sewing machine executes button sewing, and then the holder driving unit 21 moves the holder to the needle 1 at the root position. (Set the button up) Move to set, and start wrapping around the root. Here, the process of forming the root winding stitch by the button sewing machine provided with the thread puller having the above-described configuration will be described in detail.
In FIGS. 1 and 3, a description will be given from the point where the needle has dropped to the right side just before the one stitch.
When the needle on the right side of the root thread 2a drops and reaches the bottom dead center of the needle bar and starts a slight upward movement, a loop portion of a sewing thread is formed behind the tip of the needle 1, and a looper 4 is formed on the loop portion. The tip of the first threading portion 4a enters. At this time, the loop portions of the sewing threads 5a and 5b at the previous needle drop (needle drop on the left side of the root thread 2a) are put between the first thread hook 4a and the second thread hook 4b. In addition, the thread pulling tool 10 moves on the arrow α so as to shift the loop portion due to the previous needle drop.

Next, when the needle 1 rises from the left side of the root thread 2a, the looper 4 expands the loop portions of the sewing threads 5a and 5b with the first thread hooking portion 4a and attaches the loop portion in the previous process to the thread hooking portion 4a. Remove from behind. At this time, the thread puller 10 moves on the arrow β as the needle 1 rises.

Subsequently, when the needle 1 descends from the needle bar top dead center position, the holding body holding the button BT and the cloth 5e is driven by the X motor 22 and the Y motor 23 to be sent one pitch, and the needle swing motor By the operation of 25, the needle 1 moves to the left side of the root thread 2a as shown in FIGS. At this time, the looper 4 rotates counterclockwise to move the loop portion of the sewing threads 5a and 5b needle-dropped to the right side of the root thread 2a from the first thread hooking section 4a to the second thread hooking section 4b. At the same time, the yarn puller 10 moves in the direction of the arrow α by hooking a middle part of the loop portion.

At this time, the sewing threads 5a and 5b are guided in the Y direction and the -X direction by the thread pulling portion 11 of the thread pulling tool 10, and reach the deepest portion 12.

Next, as the needle 1 descends and descends on the left side of the root thread 2a, the loop of the previous sewing thread 5a, 5b needle-dropped to the right side of the root thread 2a is tightened to form a knot (seam). . At the same time, the loop portion of the sewing thread 5a, 5b on the right side of the root thread 2a moves from the first thread hooking section of the looper 4 to the second thread hooking section 4b side, and from below the root thread 2a. It is in a state of being stretched obliquely over the yarn puller 10.
Thereafter, when the needle 1 dropped to the left side of the root thread 2a starts slightly ascending from its bottom dead center, a new loop portion is newly formed on the back side of the tip of the needle 1, Thereafter, the sewing is performed in the same manner as described above.

When the root winding sewing is performed in this manner, the thread puller 10 moves the intermediate portions of the two sewing threads (loop portions) 5a and 5b passed between the root thread 2a and the looper 4 by V. By hooking at the insertion portion 12 and moving it to the deepest portion, it acts so as to approach in the Y direction in FIG.
As shown in FIG. 6, at the time of root wrap sewing, when the sewing proceeds in the −Y direction from the button BT toward the cloth 5e, the feed pitch is the amount M to which the root wrap thread adheres. When the sewing proceeds in the Y direction toward the BT, that is, when the sewing proceeds by the thread puller 10 in the thread pulling direction of the sewing threads 5a and 5b, the feed pitch MB is set to be larger than this.
By setting the feed pitch MB to be greater than the thread-shifted previous needle drop sewing thread 5a, 5b, the needle 1 can be prevented from descending between the thread-shifted previous needle drop sewing thread 5a, 5b. Eye skipping can be prevented.

FIG. 7 shows the shape of the stitch when the needle drop position is moved in the Y direction from the cloth 5e to the button BT at the feed pitch MB in the root winding sewing. Thus, when performing the root winding sewing in the Y direction, the needle 1 can be prevented from descending between the sewing needles 5a and 5b of the previous needle drop that have been shifted, and skipping can be completely prevented. In addition, 2b is a thread end of the root thread 2a, and is a remaining thread at the time of thread cutting.

Next, an operation of performing the root winding sewing shown in FIGS. 9 to 13 after the button sewing is completed by the sewing machine having the above configuration will be described with reference to a flowchart shown in FIG.
When the seam forming direction is the Y direction toward the thread pulling direction at the time of root winding sewing, the feed pitch is set to MB, and when the stitch is formed in the -Y direction, the normal feed pitch M is set as an initial value in advance by a setting switch (setting means). ) 27 is stored in the storage means 29.
When the root-wrap sewing is started from the state before the button-wrap sewing and the start of the root-wrap sewing shown in FIG. 9, if the needle entry direction of the read root-wrap sewing data (S1) is in the Y direction, S2) The feed pitch MB is set (S3), and the root winding sewing is performed while the needle is being swung by the XY driving means (motors 22, 23, 25) (S5). When the sewing is completed, it is determined whether the sewing is completed (S6). When the sewing is not completed (S2), the feed pitch M (S4) in the -Y direction is read, and the driving means is driven for each stitch (S5). I do.
When it is determined that the sewing is completed after the reciprocating root winding sewing (S6), in the case of the overlap sewing (S7), the root winding sewing is reciprocated again, and the thread is trimmed at the set number of times, for example, twice reciprocating (S8). The winding ends. The control of S1 to S8 constitutes a control means.

FIG. 10 shows the shape of the stitch when the needle drop position is moved in the Y direction at the feed pitch MB in the root winding sewing.

Next, FIG. 11 shows a stitch shape when the needle drop position is moved from the button BT to the cloth 5e in the -Y direction opposite to the thread moving direction at the feed pitch M where the root winding thread is in close contact. Since the needle drops in the direction opposite to the thread shifting direction, the needle 1 does not descend between the sewing threads 5a and 5b of the previous needle drop that have been shifted.
Therefore, root winding sewing can be performed at the feed pitch M at which the root winding thread is in close contact. However, since the root winding at the feed pitch M suitable for sewing the thread end 2b is performed only on one stitch, the thread end 2b is insufficiently sewn. It is in a state of being protruded from the root wrap seam.

Therefore, the root winding sewing is reciprocated again, and FIG. 12 shows the second root winding sewing. That is, a stitch is formed at the feed pitch MB in order to move the needle drop position from the cloth 5e to the button BT in the Y direction along the thread pulling direction.

Fold the root wrap sewing again to form as shown in FIG. That is, in order to move the needle drop position from the button BT to the cloth 5e in the −Y direction opposite to the thread moving direction, the stitch is formed at the feed pitch M where the root winding thread is in close contact. As a result, the leading end of the partial thread end 2b is sewn to the root winding seam.

Until the end of the thread is wound, the reciprocation of the root winding sewing may be repeated three times or four times, and the root winding may be repeatedly wound. For this purpose, a means for setting the number of repetitions may be provided, and the number of repetitions of the set number of repetitions may be calculated each time the root winding sewing is reciprocated, and may be repeated until the number reaches zero.

Further, in the above-described embodiment, a setting unit capable of arbitrarily setting the feed pitch MB and the feed pitch M is provided, and the direction of the root winding sewing data read during the root winding sewing is detected, and the direction of the yarn shifting is detected. In the case of the Y direction along, the set feed pitch MB is set, and in the case of the −Y direction along the direction in which the yarn is pulled, the set feed pitch M is read, and the driving means is driven for each stitch. Different feed pitches may be stored in advance in the sewing data in accordance with the sewing direction.

In the case where the root winding sewing is reciprocated a plurality of times, when the material is folded back, sewing data may be created so that the needles fall on the material, and the sewing data may be executed by the driving unit. In this way, even if the seam of the feed pitch MB to which the root winding thread does not adhere is formed, the root winding seam can be prevented from moving on the root thread and can be stabilized.

Further, an automatic thread tension means having a thread tension solenoid described in, for example, Japanese Patent Application Laid-Open No. 2000-300882 is arranged on the sewing machine described above, and a graphic such as that shown in FIG. 18 is displayed on a liquid crystal display. By providing the operation panel, the thread tension at the time of root winding sewing can be increased at the button side end and the fabric side end of the root thread relative to the intermediate portion of the root thread.

That is, by inputting a numeric key or a character key (not shown) on the operation panel, a sewing area (first area E1) at the cloth side end, a sewing area (second area E2) at the middle part, and a button side end Of the sewing area (third area E3) (length in the direction along the root thread direction) L1 to L3, root winding pitches P1 to P3, and thread tension T1 to T3 can be set. The set length L1 of the first area E1 input in the display state of FIG. 18A is displayed on the display unit 301, and the set lengths L2 and L3 of the second area E2 and the third area E3 are displayed on the display units 302 and 303. Is displayed. Also, the input set roll feed pitch P1 of the first area E1 is displayed on the display unit 304, and the set roll feed pitches P2 and P3 of the second area E2 and the third area E3 are also displayed on the display units 305 and 306. Is done.

Further, the set thread tension T1 of the first area E1 input when the display is switched as shown in FIG. 18B is displayed on the display unit 307, and the set thread tensions T2 and T3 of the second area E2 and the third area E3 are also displayed. It is displayed on the display units 308 and 309.

Further, in FIG. 18B, the sewing machine driving speed of each of the areas E1 to E3 can be set. That is, when the speed is input by the ten keys, the set speed of the first area E1 is displayed on the display unit 310, and the set speeds of the second area E2 and the third area E3 are similarly displayed on the display units 311 and 312.

In addition, the sewing starts from the first area E1 at the cloth side end, and after the root winding at the third area E3 at the button side end is completed, returns to the first area E1 at the cloth side end from the third area E3. In this case, after the above setting is stored by operating a recording instruction key (not shown) on the operation panel, the return winding pitch, thread tension, sewing machine, and the like of the return areas E1, E3, and E2 are stored. The drive speed can be set on the operation panel in the same manner.

Further, when the above-mentioned reciprocating root wrap sewing is repeated a plurality of times, the operation of the designation key (not shown) on the operation panel and the recording instruction key causes the operation of the recording instruction key to perform the reciprocating root wrap sewing in each area. The root feed pitch, thread tension, and sewing machine drive speed can be set on the operation panel.

For the setting operation of each of the above areas En, the set values are stored in a ROM or the like in advance, the data of the ROM is designated by inputting numerical values of the numeric keypad, the set values are read out from the ROM and recorded in the RAM, or The input numerical value may be recorded and set in the RAM as it is.

The time of root winding sewing will be described with reference to FIGS. Using the operation panel, the root winding length Ln1 of each area En, the Y-direction feed pitch Pn1 when starting to sew the root winding from the fabric side, and the -Y direction feed pitch Pn1r at the time of return are set on the operation panel as described above. Then, the thread tension Tn1 for the Y direction sewing of each area En and the thread tension Tn1r for the -Y direction sewing of each area En are set (step S11), and the sewing speed Vn1 of the area En for the Y direction sewing similarly. And a sewing speed Vn1r at the time of sewing in the −Y direction is set (step S12).

When there is an operation of the designation key for performing the reciprocating root winding a plurality of times (step S13), the feed pitches Pn2, Pn2r in the Y direction and the −Y direction are obtained for each of the second areas E1, E2, E3. , The thread tensions Tn2 and Tn2r and the sewing speeds Vn2 and Vn2r are set (steps S14 to S16).

Thereafter, it is determined whether there is a signal of "re-setting" or "setting end" by operating a confirmation switch (not shown) on the operation panel (step S17). When "re-setting", the process returns to step S10, and the "setting end" ”, For each area En, the number of stitches Nn1 in the Y direction sewing is set by the set area length Ln1 and the feed pitch Pn1, and the −Y direction sewing is set by each area length Ln1 and the feed pitch Pn1r. The number Nn1r is obtained by calculation, respectively, and when there are a plurality of settings, the number Nn2 of sewing in the Y direction by each area length Ln2 and the feed pitch Pn2 for the second time, each area length Ln2r, the feed pitch Pn2r, , The number of stitches in the −Y direction is obtained by calculation (step S18).

(5) When a start signal is generated by pedal operation or the like (step S19), the needle swing motor 25 is driven so that the root winding is performed by the needle swing amount set in the same manner as described above (step S20). Next, the X motor 22 and the Y motor 23 are driven so that the feed pitch P11 of the first area E1 is obtained, and the thread tension solenoid is biased so that the set thread tension T11 of the first area E1 is obtained. The sewing machine is driven at the set sewing speed V11 of the area E1 (step S21), and root winding sewing of the first area E1 on the fabric side end is formed.

When the sewing machine is driven and the number of stitches is counted by a well-known number-of-stitches counting means, and the count value N becomes the number of stitches N11 of the first area E1 obtained by the above calculation (step S22), the second area E2 The feed pitch P21, the thread tension T21, and the speed V21 are set in the same manner as in Step S21, and the X and Y motors 22, 23, the thread tension solenoid TS, and the sewing machine motor are driven to form the root winding in the second area E2. Is performed (step S23).

When the predetermined number of stitches N21 of the third area E3 is counted (step S24), the feed pitch P31, the thread tension T31, and the speed V31 of the third area E3 are set and the third area E3 is set. A root wrap stitch is formed. (S25).
When the root wrap sewing of the third area E3 reaches the predetermined number of stitches N31 (step S26), the root wrap sewing has reached the button side end, and then the reverse direction toward the fabric side of the third area E3 (−Y direction) The feed pitch P31r, thread tension T31r, and sewing speed V31r are set, and root winding sewing is performed toward the fabric edge (step S27).
When the number of stitches reaches the predetermined number N21r (step S28), the feed pitch P21r in the −Y direction of the second area E2, the thread tension T21r, and the sewing speed V21r are set, and root winding of the intermediate portion is performed (step S29).
When the number of stitches reaches the predetermined number N21r (step S30), the feed pitch P11r, the thread tension T11r, and the sewing speed V11r in the -Y direction of the first area E1 are set, and the fabric end side is wound (step S31). . When the number of stitches of the predetermined number N11r is counted (step S32), if this root winding sewing is not set a plurality of times (step S33), the sewing is stopped by the processing of the sewing end subroutine (step S34). Then, the process proceeds to step S35.
Then, from step S35 to step S48, the second root winding sewing is performed for each of the areas E1 to E3, at the respective feed pitches P12, P22, P32, P32r, P22r, P12r, and thread tensions T12, T22, T32, T32r, T22r. , T12r, and sewing speeds V12, V22, V32, V32r, V22r, and V12r are sequentially set, and are respectively processed and executed in the same manner as steps S20 to S32.
In the above example, the setting is performed a plurality of times for the entire root winding sewing, but may be set for each of the areas E1 to E3. This case can be achieved by making settings using the keys on the operation panel a plurality of times in steps S10 to S12. Especially when the root winding is performed a plurality of times in the area E1, which is the cloth measuring end, the root winding thread is sewn also to the cloth end side, so that the root winding thread does not shift to the button side, and the root looks good. There is an effect that the winding can be maintained for a long time.

In the above example, the setting from the step S10 to the step S14 is set after sewing the button (root thread sewing). However, the setting may be set before the start of the root thread sewing.

Also, when changing the swing width of the root wrap according to each area E1, E2, E3, changing the needle swing width according to the sewing direction, or changing the needle swing width in the first and second times, the above operation is performed. Each needle swing width can be set by key input on the panel, and the needle swing width can be changed before starting sewing in each area, before changing the sewing direction, or before the second root winding sewing. Good.
For example, when it is desired to set different needle swing widths in the first root winding in the Y direction and the root winding in the −Y direction, this is achieved by performing a setting process so that the needle swing width is set after step S26. You.
In addition, since the thread tension can be set for each of the areas E1 to E3, for example, if the thread tension is gradually increased from E1 to E2, E3, for example, in accordance with the progress of the root winding sewing, a firm root winding sewing is performed. Can be performed.

In addition, root winding sewing data in which the first and second needle swing amounts are changed is stored in advance, and is read out during the root winding sewing, and the drive amount of the needle swing motor is set to the first and second times. May be controlled so as to be changed automatically.
Further, when performing root winding sewing a plurality of times, it is possible to control so that the thread tension Tn, the speed Vn, and the feed pitch Pn of each area En are changed each time. The section may be controlled to change the thread tension Tn, the speed Vn, and the feed pitch Pn in units of directions or units.

In addition, setting means for setting the first and second needle swing amounts are provided, and the number of reciprocations is counted during root winding sewing, and the first and second root winding sewings are discriminated and sent to each. The pitch may be controlled to be automatically changed to the feed pitch set by the setting means.
According to these, the needle swing can be minimized, so that not only the thread tightness is good, but also the risk of needle dropping between the sewing threads brought by the thread puller is reduced, so that the feed pitch can be made smaller, It is possible to realize beautiful root wrap sewing.

As described above, according to the button sewing machine of the first aspect of the present invention, it is not necessary to perform thread picking, so that productivity can be greatly improved.

In addition, when the needle dropper moves along the needle pulling direction by the yarn puller, the feed pitch is increased to prevent the needle dropping between the two yarns twisted by the yarn puller, so that the stitch is skipped. Can be prevented, and stable and efficient button attachment can be performed.

Also, by reciprocating the root wrap sewing a plurality of times, the thread end of the root thread can be wound into the root wrap seam, so that a beautifully finished root wrap can be obtained.

Since root wrap sewing is performed twice or more times, the floating button stands firmly and a high quality root wrap button can be sewn.

(4) Conventionally, when the core is wrapped with a thick yarn, the texture is good, but there is a problem that the bumps are conspicuous. In addition, when the core was wound with a fine yarn count, the knot became less noticeable, but the texture of the yarn could not be obtained. According to the present invention, even if the root is wound with a fine yarn count, by repeating this multiple times, the same texture as a thick yarn count without bumps can be obtained, which is an extremely excellent effect.

It is a perspective view showing the important section of the sewing machine with a button concerning the present invention, and shows that needle 1 falls to the left side of root thread 2a in root wrap sewing. FIG. 2 is a diagram showing a thread pulling portion of the thread pulling tool of the button sewing machine shown in FIG. 1. It is a front view which shows the principal part of the sewing machine with a button shown in FIG. It is a side view which shows the principal part of the sewing machine with a button shown in FIG. It is a control block diagram of the present invention. FIG. 8 is a diagram illustrating a needle drop position for a sewing thread that has been shifted at a feed pitch MB. It is a figure which shows the root winding sewing shape by feed pitch MB. 5 is an operation flowchart of the present invention. It is a figure showing a button and cloth just before performing root wrap sewing. It is a figure which shows the sewing shape which formed the root winding stitch at the large feed pitch MB in the sewing direction toward the Y direction. FIG. 8 is a diagram showing that the needle drop is formed by turning the direction back and reducing the feed pitch after the root winding in FIG. 7. It is a figure which shows forming the 2nd overlap sewing at a large feed pitch after the sewing of said FIG. It is a figure which shows that it formed at the small feed pitch of the 2nd time by turning over after the said sewing of FIG. It is a figure showing the thread pulling part of the thread pulling implement of the conventional button attachment sewing machine. It is a front view which shows the principal part of the conventional button sewing machine. It is a side view which shows the principal part of the conventional sewing machine with a button. It is a figure showing the conventional root wrap sewing. It is an explanatory view showing a display on an operation panel of the present invention. 4 is a flowchart for one of the embodiments of the present invention. 20 is a flowchart continued from FIG. 19. 21 is a flowchart continued from FIG. 20. 22 is a flowchart continued from FIG. 21. 23 is a flowchart continued from FIG. 22.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Needle 2 Sewing material 2a Thread 4 Looper 5a, 5b Sewing thread 5c Thread 5d Button 5e Fabric 10 Thread puller 11 Thread puller 12 Deepest part

Claims (10)

A needle that moves up and down,
A looper that picks up a loop of the sewing thread when the needle reaches the bottom dead center and starts to rise in conjunction with the movement of the needle,
Interlocking with the operation of the needle, immediately before the needle reaches the bottom dead center, the two sewing threads hung between the fabric and the looper are moved in a predetermined direction, and are moved from the reciprocating path of the needle. A yarn puller that is moved to retreat,
A holder holding the fabric and buttons,
Driving means for relatively moving the needle and the holder in X-Y for each needle,
After the button sewing to sew between the cloth and the button hole of the button, while driving the driving means, the needles are sequentially dropped on both sides of the root thread passed between the cloth and the button by the button sewing. In a button sewing machine that performs root winding sewing in which the needle drop position reciprocates at a predetermined feed pitch along the root thread passing direction,
The control means for driving the driving means by changing the feed pitch per stitch when the root winding is performed from the fabric side to the button during the root winding sewing and when the root winding is performed from the button side to the cloth. A sewing machine with a button, characterized by having When the sewing direction of the root winding stitching when reciprocating the needle drop position along the passing direction of the root thread is a direction along the direction in which the sewing thread is moved by the thread puller, the feed pitch is set by the needle. The sewing machine with a button according to claim 1, wherein the amount of movement is greater than the amount of the sewing thread that has been shifted by the thread shifter. When the sewing direction of the root winding sewing that reciprocates the needle drop position along the passing direction of the root thread is a direction along the direction in which the sewing thread is moved by the thread puller, the feed pitch can be arbitrarily changed. The sewing machine with a button according to claim 1, wherein The button sewing machine according to claim 1, wherein root winding sewing reciprocating in the root thread passing direction is performed a plurality of times. The sewing machine according to claim 1, wherein, when performing the root winding sewing reciprocating along the root thread passing direction at the time of the root winding sewing, the sewing machine is reciprocated a plurality of times on the cloth side end side. Equipped with a thread tensioner that can automatically change the thread tension to the set value,
The button sewing machine according to claim 4 or 5, wherein the thread tension is varied according to the number of times of root winding sewing. When forming the root winding sewing by reciprocating a plurality of times along the passing direction of the root yarn at the time of the root winding sewing, it is preferable that a swing width at the time of needle dropping on both sides of the root yarn is made different width by the plurality of times. The button sewing machine according to claim 4, wherein 5. The sewing machine according to claim 4, wherein, when forming the root winding by reciprocating a plurality of times along the passing direction of the root thread at the time of the root winding sewing, the sewing speed of the sewing machine is driven at a different speed depending on the rotation of the plurality of times. Sewing machine with button described in. Equipped with a thread tensioner that can automatically change the thread tension to the set value,
The sewing machine with a button according to claim 1, wherein the thread tension is varied according to a position where the root winding sewing is formed. The sewing machine with a button according to claim 1, wherein the sewing speed of the sewing machine is driven at different speeds depending on the forming position of the root winding sewing.

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