KR100685060B1 - Sewing machine for sewing button on - Google Patents

Abstract

Prevents the thread from being cut before the mobile and fixed blades engage with each other.

As a means for solving this problem, a button having a needle 410, a cloth pressing mechanism 110 for fixing the sewing object at the same time to fit the button, and a cloth transfer mechanism 150 for moving the cloth pressing mechanism 110 Thread cutting device 200 according to the present invention is disposed on the sewing machine. The thread cutting device 200 pulls the thread to the fixed blade 230 by the mobile blade 220 and cuts the yarn by engaging the mobile blade 220 and the fixed blade 230. Operation of the cloth transfer mechanism 150 is controlled to adjust the position of the button relative to the fixed blade 230 from the end of sewing until the mobile blade 220 is operated. As a result, the distance between the nodule portion and the blade portion 231 is always constant or the length of the remaining thread after cutting can be arbitrarily changed.

Description

Button Sewing Machine {SEWING MACHINE FOR SEWING BUTTON ON}

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the external appearance of the conveying apparatus and the thread cutting device of this embodiment.

2 is a perspective view showing a main part of the thread cutting device.

3 is a perspective view showing a main part of the thread cutting device;

4 is a block diagram showing a control device of the sewing machine of the present embodiment.

5 is a plan view showing an operation panel provided in the sewing machine of the present embodiment.

6 is a flowchart showing the flow of operation of the sewing machine of the present embodiment.

7 is a view schematically showing a thread cutting device provided in a conventional sewing machine.

Figure 8 is a cross-sectional schematic of the thread cutting device and the suture in the thread cutting operation state of this embodiment.

Fig. 9 is a front view showing the main part of the thread cutting device of the sewing machine of this embodiment.

※ Explanation of symbols about main part of drawing ※

110: cloth pressing mechanism (fixing means), 150: cloth transfer mechanism (transfer means)

200: thread cutting device 220: mobile scalpel

221: blade portion 230: fixed blade

231: blade portion 260: guide member (prevention means)

300: control device (control means) 309: operation panel (correction input means)                 

410: needle

The present invention relates to a sewing machine for sewing a button by sewing a button on the sewing object while moving the button and the sewing object, and then cutting the thread with a fixed knife and a moving knife after the button is closed.

A sewing machine for attaching a button to a fabric (seamless material) includes a pressing plate on which a fabric is placed, a button fixing mechanism for fixing the button, and a fabric sandwiched between the button and the pressing plate supported by the button fixing mechanism. It is composed. When the button is attached to the fabric by a seam, the needle drop is performed in a predetermined order to the various through holes formed in the button by moving the button fixing mechanism and the pressing plate integrally.

In the case of a sewing machine buttoned with a simple chainstitch, a sewing thread that spans a pair of thread and holes is formed at the midpoint between the thread and the hole at the back of the fabric. And the knot of sewing finish is formed by the well-known method as described, for example in US Pat. No. 5,799,599 in the nodule part at the time of the last needle fall. Therefore, when the button having two or more through-holes is sewn, the position of formation of the nodule varies depending on the button depending on the order of dropping the needle into the through-hole.

For example, in the case of a button having four holes, as shown in Fig. 7 (a), the thread between the holes 13a and 13c and the holes 13b and 13d becomes a sewing pattern intersecting at the button center. As shown in Fig. 7 (b), the yarns between the holes 13a and 13b and the holes 13c and 13d are parallel to the sewing pattern.

And the nodal point of the seam formed behind the cloth is one of the approximately center of the button B in the case of the sewing pattern to cross as shown in Fig. 7 (a), and the final knot is formed at the same place. In addition, in the case of parallel sewing patterns as shown in Fig. 7 (b), there are approximately two places in the center between two pairs of thread-through holes that span the sewing line, and a final knot is formed at one of the points.

However, in the above-mentioned sewing machine with a button, as shown in Fig. 7 (a) and (b), a fixed blade 11 fixedly supported by a needle plate (not shown), and a moving blade supported so as to rotate freely on the needle plate ( 12) and a thread cutting device 10 composed of a thread splitting member 12A disposed on the movable blade 12.

After the button is sewn and the movable blade 12 is rotated, the thread-breaking member 12A guides the needle thread leading to the fabric to the blade portion, and the blade portion of the movable blade 12 is picked up by the fixed blade 11. The thread is cut by pulling the fixed blade 11 and the moving blade 12 together.

However, according to the above-described thread cutting device 10, there was a case where the mobile mess 12 cuts the thread in the middle of pulling the thread before the mobile mes 12 and the fixed mes 11 are engaged. In particular, as the position of the nodules due to the falling of the final needle is moved away from the fixed blade 11, the distance between the moving blade 12 and the thread to the fixed blade 11 becomes longer, so that the fixed blade 11 and the mobile blade 12 The thread is tensioned before the mesh is engaged, which increases the likelihood of cutting the thread using only the moving blade 12. In addition, if the thread is cut only by the mobile mes 12 before the fixed mes 11 and the mobile mes 12 are engaged, the appearance of the thread cutting end becomes poor.

As described above, the seam cutout position of the final needle drop is different with respect to the button according to the difference in sewing patterns such as the X-shape of FIG. 7 (a) or the parallel shape of FIG. 7 (b). Therefore, since the thread length guided by the fixed knife in the thread through hole of the button is different depending on the sewing pattern, the length of the remaining thread extending from the button after cutting is lowered, thereby lowering the value of the product.

Therefore, an object of the present invention is to prevent the thread from being cut before the mobile blade and the fixed blade are engaged. Another way is to adjust the length of the remaining thread.

In order to solve the above problems, the invention of claim 1 is

Fixing means 110 for fixing the button and the object to be sealed,

A transfer means 150 for moving the fixing means to sew the button on the sewing object by seams of a predetermined sewing pattern;

Fixed scalpel 230,

A mobile scalpel 220 is provided which moves the thread by pulling the thread by the operation and then cuts the thread by cooperation with the fixed scalpel, and sewn a button by a predetermined number of seams to cut the thread after attaching the button. In the sewing machine,

And a control means 300 for controlling the cloth transfer means to move the button for the fixed blade to a predetermined position after the cutting.

As described above, according to the invention of claim 1, in order to adjust the position of the button with respect to the fixed blade after cutting, it is possible to adjust the distance between the nodules and the fixed blade due to the drop of the final needle. Therefore, the length of the thread remaining after thread cutting can be arbitrarily changed. If the length of the remaining thread becomes longer after cutting, the knot will not loosen well, for example, a button suitable for work clothes can be attached. On the other hand, if the length of the remaining thread is shortened after cutting, the appearance of the knot is improved, for example, a button suitable for fashion clothes can be attached. Thus, the sewing machine to which the thread cutting device according to the present invention is applied can be attached to the sewing object according to the intended use of the sewing object.

After sewing, the position of the button can be closer to the fixed blade, and the nodules due to the drop of the final needle approach the fixed blade. Therefore, when the mobile scalpel pulls the thread, the cutting blade is prevented from being cut only by the mobile scalpel.

The invention of claim 2 is a thread cutting device of claim 1,

The control means is characterized in that for moving the button relative to the fixed blade so that the distance from the nodal portion of the thread to the blade portion of the fixed blade in the final needle fall.                     

As described above, according to the invention of claim 2, the distance from the nodular part of the thread to the blade part of the fixed blade at the time of the final needle drop can be kept constant based on the sewing pattern. I can make it constant.

The invention of claim 3 is a thread cutting device of claim 1,

And the control means moves the button with respect to the fixed blade so as to freely change the remaining length of the thread after thread cutting by changing the distance from the nodal portion of the thread to the blade portion of the fixed blade in the final needle fall. do.

As described above, according to the invention of claim 3, the distance from the nodular part of the thread at the time of the final needle drop to the blade part of the fixed blade can be changed freely based on the sewing pattern. have. If the length of the remaining thread after cutting the thread becomes longer, the knot may not be loosened, for example, a button suitable for work clothes may be attached. On the other hand, if the length of the remaining thread after cutting is shortened, the appearance of the knot is improved, and for example, a button suitable for a garment with a pattern can be attached. In this way, the sewing machine to which the thread cutting device according to the present invention is applied can be attached to the sewing object according to the intended use of the sewing object. In particular, the sewing machine to which the thread cutting device according to the present invention is applied can be used for a sewing object for various uses.

The invention of claim 4 is a thread cutting device of claim 3,

And correction input means (309) for correcting the distance from the nodule portion of the thread in the final needle fall to the fixed blade.

As described above, according to the invention of claim 4, since the distance from the nodule of the final needle to the fixed blade can be corrected, the size or type of the button is changed, and thus the position of the nodal to the final needle is dropped. Even if it changes, the distance between a nodule and a fixed blade can be adjusted suitably.

The invention according to claim 5 is a thread cutting device according to any one of claims 1 to 4, which prevents the thread from contacting the blade portion of the mobile blade until the fixed blade and the mobile blade are engaged. The means (guide member 260) is arranged on the moving blade.

According to the invention of claim 5, it is possible to prevent cutting the thread with only the moving blade. In this way, since the cutting of the thread is prevented when pulling the thread, the appearance of the thread cut part is prevented from deteriorating.

Invention of Claim 6 is a thread cutting device as described in Claim 5,

The prevention means,

A guide portion 260 is formed in advance of the blade portion of the mobile blade in the moving direction of the mobile blade.

The guide unit is coupled to the thread to guide the fixed blade.

As described above, according to the invention of claim 6, since the guide part is disposed on the moving knife, the guide part preceding the blade part of the mobile blade is joined to the thread first, and thus the blade part of the mobile blade comes into contact with the thread. You can prevent it. Therefore, it is possible to prevent the cutting of the thread with only the moving blade until the fixed blade and the moving blade start to engage, thereby preventing the appearance of the thread cut portion from deteriorating.

Next, embodiments of the present invention will be described with reference to the drawings.

The sewing machine buttoned by a simple chain stitch of the present embodiment has a general frame structure consisting of a bed portion, a circumference portion and a female portion, and includes a transfer device 100 as shown in FIG. 1 and a thread cutting device 200 shown in FIG. 2. Doing.

The looper 420 (FIG. 3) disposed in the bed part operates in synchronism with the vertical motion of the needle 410 fixed to the lower end of the needle bar, and is first formed by capturing the thread T of the needle 410. A single thread chain stitch is formed by a loop and a seal formed after the seal.

The needles 410 alternately penetrate between the two through-holes B1 (B2) (FIG. 8) of the button B (FIG. 8) to form a single thread chain stitch, and sew the button to the sewing object W (FIG. 8). I will. Then, when the final needle falls, an operation of forming a final nodule at about the same place as the previous time is performed, whereby a knot of thread is formed, and then the moving blade 260 of the thread cutting device 200 is connected to the loop 420 and the cloth. The thread Ta on the side is picked up and cut | disconnected by cooperation with the fixed knife 230.

As shown in Figure 1, the transfer device 100 is composed of a cloth pressing mechanism 110 (fixing means) for holding a button and at the same time to secure the sewing object, and a cloth feeding mechanism 150 for moving the cloth pressing mechanism 110. do.

The cloth feed mechanism 150 has the following configuration. That is, the first drive motor 151 and the second drive motor 152 made of a pulse motor are arranged symmetrically to the left and right with respect to the feed table 161 in the bed part on the follower side. The first driving motor 151 and the second driving motor 152 are disposed such that each of the output shafts 153 and 154 protrudes upward from the upper surface of the bed portion.

The output shaft 153 has an eccentric member 155 fixed to the output shaft 153, an eccentric shaft 157 fixed to the eccentric member 155 so as to be eccentric with respect to the shaft center of the output shaft 153, and an eccentric shaft 157. A first connecting mechanism comprising a link member 159 whose one end is freely rotated is disposed. A second connection consisting of an eccentric member 156, an eccentric shaft 158, and a link member 160 formed in the same shape as the eccentric member 155, the eccentric shaft 157, the link member 159 to the output shaft 154 The instrument is arranged. These first and second connecting mechanisms are arranged symmetrically with respect to the transfer table 161.

The transfer table 161 is connected and supported to freely rotate the proximal end to each other end of the link members 159 and 160, and extends along the bed surface to arrange the distal end at the distal end of the bed. A central hole of the conveyance table 161 is formed with a long hole-shaped guide hole 162 along the longitudinal direction of the conveyance table 161. The guide member 163, which is supported to rotate freely about the support shaft 163A with respect to the bed portion, is coupled to freely slide in the longitudinal direction with respect to the guide hole 162.

The feed table 161 rotates about the support shaft 163A of the guide member 163 and is guided by the guide member 163 and the guide hole 162 to support the support shaft 162 in the longitudinal range of the guide hole 162. It is configured to be able to swing around 163A.                     

The cloth pressing mechanism 110 is composed of a conveying plate 111 for supporting the object to be sealed, and a handle device 112 for pressing the object to be clamped at the same time as clamping the button.

The conveying plate 111 is fixed to the distal end of the conveying table 161, and a long hole 111A (FIG. 8) is disposed in the conveying plate 111 at least in a direction orthogonal to the extending direction of the conveying table 161. The needle 410 penetrates through 111A.

The handle device 112 is disposed at the tip of the support plate 113 and the support plate 113 supported so as to freely rotate the proximal end with respect to the feed table 161 so that its tip freely undulates with respect to the feed table 161. It has a button clamp mechanism 114 which clamps and supports.

The handle device 112 is urged downward by a spring (not shown). By this force, the button clamp mechanism 114 is pressed onto the transfer plate 111 to pick up the object to be sealed. Moreover, it is comprised by the drive device 312 (shown in FIG. 4) which uses a solenoid, a motor, etc. as a drive source, raises the handle | steering-wheel 112 against the said force, and releases a to-be-encapsulated object.

When the eccentric members 155 and 156 rotate about the respective output shafts 153 and 154 by the driving of the first driving motor 151 and the second driving motor 152, the eccentric shafts 157 and 158. The link members 159 and 160 supported by the rocker are displaced. Accordingly, the feed table 161 is in the longitudinal range of the guide hole 163, and moves back and forth, and at the same time, swings from side to side about the support shaft 163A. Accordingly, the feed plate 111 and the button clamp mechanism 114 are moved. Also move forward, backward, left and right.                     

That is, the first driving motor 151 and the second driving motor 152 are individually controlled in the rotational direction and the amount of rotation, so that the transfer plate 111 and the button clamp mechanism 114 move to an arbitrary position on the X-Y plane.

Accordingly, the needle 410 moves the buttons in a predetermined order by moving the feed table 111 and the button clamp mechanism 114 on the XY plane according to the type, size, and sewing pattern of the button supported by the button clamp mechanism 114. A single thread chain stitch is formed through the through hole and the hole of B, and the button B is sewn to the sewing object W.

Next, the actual cutting device 200 will be described. Thread cutting device 200 is a needle plate 210, a moving blade 220, a fixed blade 230, a thread cutting arm 240, a thread as shown in Figs. 2 and 3 (a) (b) It consists of a dividing member 250 and a guide member 260.

The needle plate 210 fixed to the bed part is disposed to face the lower side of the transfer table 111, and the needle hole 211 having a horizontally long shape having a shape substantially the same as the hole 111A of the transfer plate 111 is formed. To be prepared.

The fixed blade 230 having the blade portion 231 is fixed to the bottom surface of the needle plate 210 to face one end in the longitudinal direction of the needle hole 211 as shown in FIG. The moving mes 220 is supported to freely rotate about the support shaft 220A fixed to the needle plate 210. In addition, the movable blade 220 is connected to the driving blade 340 (shown in FIG. 4) to which the driving device 313 (shown in FIG. 4) having a driving source such as a solenoid or a motor is freely rotated to drive the driving device 312. When the thread cutting arm 240 is operated by the moving blade 220 rotates about the support shaft 220A, the blade portion 221 is fixed to the fixed blade 230 along the longitudinal direction of the lower side of the needle hole 211 230 It moves toward the blade portion 231 of the). And the blade portion 221 is captured by the looper 420 to capture the thread (Ta) connected to the looper 420 and the cloth and attracted to the fixed blade 230 and at the same time engaged with the fixed blade 230 (Ta) Cut)

In addition, the drive device 313 for driving the movable blade 220 is the handle device 112 after the thread cutting device 200 is operated by the operation of the same solenoid as the drive device 312 to raise the handle device 112. The to-be-sealed material W picked up by) may be loosened.

In addition, the thread dividing member 250 is disposed on the bottom surface of the movable scalpel 22 and the guide member 260 is disposed on the upper surface of the movable scalpel 220 and fixed to the movable scalpel 220, respectively. Thread splitting member 250 is the same as the conventional configuration shown in Figure 7 when the mobile blade 220 is moved when the splitting member 250 to separate only the thread to capture only the thread to be cut the blade of the mobile blade 220 Send to section 221.

In addition, as shown in FIG. 9, the thread dividing member 250 is disposed on the bottom surface of the movable blade 220, and the guide member 26 is disposed on the upper surface of the movable blade 220, and fixed to the movable blade 220.

The guide member 260 constituting the preventing means is disposed to extend so that the tip guide portion 260A covers the upper blade portion 221 of the moving blade 220 as shown in FIGS. 8 and 9.

The guide member 260 constituting the preventing means is disposed to extend so that the tip guide portion 260A covers the blade portion 221 of the movable blade 220 as shown in FIG. 8. When the moving blade 220 moves toward the fixed blade 230, the thread captured by the thread dividing member 250 is guided to the blade portion 221, but the tip guide portion 260A of the guide member 260 is the blade portion. 221 prevents the thread and the blade portion 221 from contacting with the thread from above.

The operation of the actual cutting device 200 having the above-described configuration will be described.

After sewing is finished, the cutting arm 240 operates and the mobile blade 220 starts to rotate. When the moving mes 220 rotates, the thread Ta to be cut by the thread splitting member 250 is guided to the blade portion 221 of the moving mes 220, but the guide member 60 is coupled to the thread Ta. This prevents the thread Ta from contacting the blade portion 221. In addition, the guide member 260 guides the thread Ta to the fixed blade 230 by the rotation of the movable blade 220, and the movable blade 220 and the fixed blade 230 mesh with each other, thereby causing the thread Ta to be interlocked with each other. Cut. In addition, the to-be-sealed material W sandwiched by the handle | steering-device 112 is released, after cutting | disconnection of the thread Ta is complete | finished.

As described above, the guide member 260 prevents contact between the blade portion 221 of the mobile blade 220 and the seal Ta, and the guide member 260 guides the fixed blade 230 to the mobile blade 220. Until the blade portion 221 of the fixed blade 230 is engaged with the blade portion 231 of the blade (Ta) does not come in contact with the blade portion 221 of the mobile blade 220, so only the mobile blade 220 The cutting of the thread Ta is prevented.

The sewing machine configured as described above is provided with a control device 300 for controlling the operation of the transfer device 100 and the thread cutting device 200 as shown in FIG. The control device 300 is to change the position of the button relative to the fixed blade 230 by controlling the operation of the conveying device 100 until the thread cutting device 200 is operated after sewing is finished. In addition, the control device 300 also serves as a control device for the sewing machine, and performs sewing control of the sewing machine.

The control apparatus 300 includes a central processing unit (CPU) 301, a read only memory (ROM) 302, a random access memory (RAM) 303, and driving circuits 304, 305, 306. 307, a start pedal 308, and an operation panel 309, each of which is connected to each other by a system bus to enable data input and output.

In accordance with a control program and control data stored in the ROM 302 and a signal input by the start pedal 308 or the operation panel 309, the CPU 301 performs control of the entire control device or various data processing. The RAM 303 is a storage means used as a work area or the like of the CPU 301, and stores the contents of the ROM 302 or the result of the calculation processing of the CPU 301.

The driving circuit 304 is connected to the sewing machine motor 310 and controls the driving of the sewing machine motor 310 based on the result of the arithmetic processing of the CPU 301. In addition, the needle 410 is moved up and down or the looper 420 is rotated by the drive of the sewing machine motor 310 to form a seam.

The driving circuit 305 is connected with the driving devices 312 and 313 for driving the thread cutting device 200 or the handle device 112, and based on the result of the arithmetic processing of the CPU 301, the driving device 312 ( 313 controls the driving.

The driving circuit 306 is connected to the first driving motor 151 and controls the driving of the first driving motor 151 based on the result of the arithmetic processing of the CPU 301. The driving circuit 307 is connected to the second driving motor 152 to control the driving of the second driving motor 152 based on the result of the arithmetic processing of the CPU 301.

The starting pedal 308 outputs an operation signal to the CPU 301 by pressing down so that the sewing machine motor 310 operates.

The operation panel 309 outputs an operation signal to the CPU 301 or the like by operating the switch. Information related to sewing can be input from the operation panel 309, and the CPU 301 performs arithmetic processing based on the information. By the operation panel 309, the sewing pattern can be set, and the distance L between the nodules formed in the final needle drop and the fixed blade 230 can be set.

5 shows an example of the operation panel 309. As shown in FIG. 5, the sewing pattern of the button B sewed to the to-be-sealed object W can be set by operating the selection switch 321 of the operation panel 309. FIG. The LED 322 corresponding to the sewing pattern is turned on by operating the selection switch 321.

In this embodiment, three sewing patterns, such as X-shape or parallel shape, and two-hole sewing buttons can be selected for four hole buttons. When the sewing pattern is selected by operating the operation panel 309, the CPU 301 reads the sewing program according to the sewing pattern from the ROM 302 based on the operation signal from the operation panel 309. FIG. Based on this sewing program, the sewing machine motor 310, the first driving motor 151 and the second driving motor 152 are controlled, and the button B is sewn on the sewing object W in the selected sewing pattern.

 In addition, the selector switch 323 sets the distance L between the nodule formed in the final needle drop and the fixed blade 230. In this embodiment, the distance can be set in five stages of "far", "slightly far", "normal", "slightly near" and "close", and the LEDs 324 are disposed according to each step. Each time the selection switch 323 is operated, the selection is moved so that the LED 324 corresponding to the distance is turned on. In each step, the distance data between the nodule and the fixed blade 230 is stored in the ROM 302 as a distance (value), and the CPU 301 determines the distance data from the ROM 302 by the selection switch 323. Read Based on this distance data, the first driving motor 151 and the second driving motor 152 are controlled and adjust the center position of the button B with respect to the fixed blade 230. In each step, the distance data between the nodule portion and the blade portion 231 of the fixed blade 230 is the same in any sewing pattern.

In this embodiment, it is also configured to be able to fine tune between each step. In other words, by operating the fine adjustment switch 325 of the operation panel 309, correction is made to the distance data stored in the ROM 302 in advance. The correction value L1 by the fine adjustment switch 325 is displayed on the display portion 326.

The operation panel 309 is provided with a setting switch 328 and selects the setting state by the pattern selection switch 321, the distance selection switch 323 and the fine adjustment switch 325 by the operation of the setting switch 328. Is output to the CPU 301.

In addition, the operation panel 309 includes a reset switch 327 and resets data set by the pattern selection switch 321, the distance selection switch 323, and the micro predetermined switch 325 by the operation of the reset switch 327. Can be set to the default value.

Next, the flow of sewing by the operation of a simple chainstitch sewing machine with a button of the present embodiment will be described with reference to the flowchart of FIG.

In the set state in which the setting switch 328 is operated (step S1), when the reset switch 327 is operated, it is set to the default value set in the factory shipment step (steps S2 to S3). When the pattern selection switch 321 is operated (step S4), the sewing pattern is selected and set in accordance with the button hole of the button B (step S5). When the operation of the distance selection switch 323 is operated (step S6), the distance L between the nodule portion at the time of the last needle drop and the blade portion 231 of the fixed blade 230 is selected and set (step S7). Moreover, when the fine adjustment switch 325 is operated as needed (step S8), based on the setting, the distance L between the nodule part and the blade part 231 of the fixed blade 230 is corrected (L ± L1) (step S8). S9). Various setting values are output to the CPU 301. After such setting or when the setting switch 328 is not operated, if a start switch (not shown) is operated (S10), the sewing program is started and sewing operation is performed (step S11).

In this sewing operation, the cloth is dropped so that the needle B drops into the holes B1, B2, etc. of the button B by the selected sewing pattern by controlling the sewing machine motor 310, the first driving motor 151, and the second driving motor 152. The pressing mechanism 110 moves in the XY direction, and a single thread chain stitch seam of a predetermined number of seams and a thread knot of the final needle drop are formed.

In this sewing program, when a needle position signal is generated from the needle position detecting means 314, which is known at the time of the final needle drop, the transfer of the distance L is performed by the first drive motor 151 and the second drive motor 152. Is controlled by the rotational direction and the rotational angle of (), and the position of the button relative to the fixed blade 230 is adjusted (step S12). Subsequently, the driving device 313 is operated (step S13) to move the moving blade 220 of the actual cutting device 200. Accordingly, before the moving blade 220 captures the thread Ta, the guide member 260 captures the thread Ta, and pulls the captured thread Ta to the fixed blade 230 and further moves the movable blade 220. ), The cutting blade 221 of the mobile blade 220 is engaged with the blade portion 231 of the fixed blade 230 to cut the thread Ta.

Thereafter, the driving device 312 is operated to raise the handle device 112 (step S14).

The first feature of the present embodiment is rigidly fixed by the feeder 100 when the movement of sewing the button B to the to-be-sealed object W is completed, until the end of the needle drop is completed and the movable knife 220 is operated. The button B with respect to the scalpel 230 is moved to adjust its position. For example, in step S6, if it is set to "close", the distance between the nodules and the fixed blade 230 during the thread cutting operation is that the transfer device 100 closes the button B with respect to the fixed blade 230 after finishing sewing. Can be made small. Thereby, the length of the remaining thread Ta which is cut | disconnected and continued from the through-hole B1 of the button B becomes short. This improves the appearance of the knot and makes it possible to put on buttons suitable for fashionable clothing.

In addition, as the nodules due to the drop of the final needle are closer to the fixed blade, the movable blade 220 does not apply tension to the thread Ta while the movable blade 220 is moved, even when the guide member 260 is not present. When the blade 221 pulls the thread Ta, the cutting blade 221 prevents cutting the thread with only the moving blade 220. Therefore, the appearance of the thread cut portion is prevented from deteriorating.

For example, if it is set to "far" in step S6, the length of the remaining thread can be lengthened by releasing the button with respect to the fixed blade 230 after finishing the sewing. If the length of the remaining thread is longer after cutting, the knot will not loosen easily, for example, a button suitable for good work clothes can be attached without worrying about the appearance.

As described above, by adjusting the position of the button B with respect to the fixed blade 230 on the basis of the sewing pattern, the distance L from the seam nodal portion to the blade portion 231 of the fixed blade 230 at the time of cutting is changed. That is, the control apparatus 300 drives the transfer apparatus 100 after finishing sewing so that it may become the distance L selected in step S6 based on the sewing pattern selected in step S4. Therefore, the length of the thread remaining after thread cutting can be arbitrarily changed. This makes it possible to attach the button according to the intended use of the object.

Also, as in the above-described embodiment, the movement of the button for changing the distance L from the seam nodal portion to the blade portion 231 of the fixed blade 230 is initiated at the time of detecting the needle position by dropping the final needle so that the needle is positioned upward. In this case, the cycle time can be shortened if it is to be performed until it stops rising.

In addition, the movement start time may be set so that the movement of the button ends until the blade portion 211 of the movable blade 210 or the tip guide portion 260A of the guide member 260 engages with the thread Ta.

The second feature of the present embodiment is to increase the distance L from the nodal portion of the thread to the blade portion 231 of the fixed blade 230 at the end of dropping the needle by adjusting the position of the button with respect to the fixed blade 230 based on the sewing pattern. It is to keep it constant. By adjusting the position of the button with respect to the fixed knife 230 based on the sewing pattern selected to be the selected distance L in step S6, the nodal part of the thread and the blade part of the fixed blade 230 at the time of the final needle drop no matter what sewing pattern is selected. The distance from 231 can always be the distance L selected in step S6.

For example, in a four-hole button, two seams formed by the needle 410 penetrating through the through holes B1 and B2 of the button B become parallel seams that cross each other at the center between the through holes B1 and B2. If the sewing pattern is selected and "close" is selected in step S6, the distance L between the seam nodal portion and the blade portion 231 of the fixed blade 230 is set to be distance data corresponding to "close" stored in the ROM 302. To control. On the other hand, in the four-hole button, two seams formed by the needle 410 penetrating through the barrel of the button B and through the holes B1 and B2 select an X-shaped sewing pattern that crosses each other at the center of the button B. If "close" is selected, the distance L is controlled so that the distance data corresponding to "close" stored in the ROM 302 is obtained. In each step, the distance data between the nodule portion and the blade portion 231 of the fixed blade 230 is the same for any sewing pattern, and therefore the distance L can be made constant even if any sewing pattern is selected. Therefore, no matter what sewing pattern is selected, the length of the remaining thread is always constant.

The third feature of this embodiment is the distance selected in step S8 by fine-adjusting the distance L between the blade portion 231 and the nodule portion of the fixed blade 230 by the fine adjustment switch 325 of the operation panel 309. It is to correct L (L ± L1). Thus, by correcting the distance L between the blade portion 231 and the nodule portion of the fixed blade 230, the size and type of the button is changed, such as a change in the size or type of the nodule portion, the blade portion of the nodule portion and the fixed blade 230 ( The distance L with 231 can be adjusted suitably.                     

It goes without saying that various changes can be made in the above embodiments without departing from the gist of the specific detailed structure and the like.

The cloth transfer mechanism 150 is not limited to the above-described configuration as long as the transfer plate 111 and the handle device 112 can be freely moved in the X-Y direction by moving back and forth left and right. For example, the transfer plate 111 and the handle device 112 may be moved back and forth with one drive motor and the transfer plate 111 and the handle device 112 may be moved left and right with the other drive motor.

In the present embodiment, the distance L between the fixed blade edge 231 and the seam nodules is set by five stages of selection, but the numerical value may be set directly on the operation panel.

According to the invention described in claim 1 as described above, the length of the yarn remaining after thread cutting can be arbitrarily changed. If the length of the remaining thread becomes longer after cutting, the knot will not loosen well, for example, a button suitable for work clothes can be attached. On the other hand, if the length of the thread is shortened after cutting, the appearance of the knot is improved, for example, a button suitable for fashion clothes can be attached. In this way, the sewing machine to which the thread cutting device according to the present invention is applied can be attached to the sewing object according to the intended use of the sewing object.

In addition, the nodules due to the final drop of the needle approach the blade of the fixed blade. Therefore, when the mobile scalpel pulls the thread, it prevents cutting the thread with only the mobile scalpel. Therefore, the appearance of the thread cut portion is prevented from becoming poor.

Further, according to the invention of claim 2, the distance from the nodular part of the thread to the blade part of the fixed blade at the time of the final needle drop can be made constant on the basis of the sewing pattern, thereby making the length of the remaining thread constant in any sewing pattern. Can be.

In addition, according to the invention of claim 3, if the length of the thread remaining after cutting is long, the knot is not easily loosened, for example, a button suitable for work clothes can be attached. On the other hand, if the length of the remaining thread is shortened after cutting, the appearance of the knot is improved, for example, a button suitable for fashion clothes can be attached. In this way, the sewing machine to which the thread cutting device according to the present invention is applied can be attached to the sewing object according to the intended use of the sewing object.

In addition, according to the invention of claim 4, the distance between the nodule and the fixed blade can be properly adjusted even if the position of the nodule of the thread is changed when the final needle falls due to a change in the size, type, or the like of the button.

In addition, according to the invention of claim 5 or 6, it is possible to prevent cutting the thread with only the moving blade. Thus, since the cutting of the thread is prevented when pulling the thread, the appearance of the thread cut part is prevented from deteriorating.

Further, according to the invention of claim 7, it is possible to prevent the guide portion pulling the thread and thereby contacting the blade portion of the moving blade with the thread. Therefore, it is possible to prevent cutting the thread with only the moving blade until the fixed blade and the moving blade start to engage. It prevents the appearance of the thread cutout from deteriorating because the thread is prevented from being cut when the thread is pulled.

Claims (6)

Fastening means for fixing the button and the object to be sealed, Transfer means for moving the fixing means to sew the button on the sewing object by seams of a predetermined sewing pattern; Fixed scalpel, In a sewing machine provided with a mobile scalpel for pulling a thread by an operation and then moving to cut the thread by cooperation with the fixed scalpel, and sewing a button with a predetermined number of seams and attaching a button for cutting the thread. And a control means for controlling said cloth transfer means to move said button for said fixed blade to a predetermined position before thread cutting. The method of claim 1, And the control means moves the button relative to the fixed blade so that the distance from the nodal portion of the thread to the blade portion of the fixed blade in the final needle fall is constant. The method of claim 1, And the control means moves the button with respect to the fixed blade so as to freely change the length of the thread remaining after the thread cutting by changing the distance from the nodal portion of the thread to the blade portion of the fixed blade in falling of the final needle. Button sewing machine. The method of claim 3, wherein And a correction input means for correcting the distance from the nodal portion of the thread to the fixed blade in the drop of the final needle. The method according to any one of claims 1 to 4, The sewing machine according to claim 1, characterized in that it is disposed on the movable blade and preventing means for preventing the thread from contacting the blade portion of the movable blade until the fixed blade and the mobile blade is engaged. The method of claim 5, The prevention means, It has a guide portion leading from the blade portion of the mobile blade in the moving direction of the mobile blade, Sewing machine for buttoning, characterized in that the guide unit is coupled to the thread to guide the fixed blade.

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