JPH0424045A - Sewing machine for wind thread shank button - Google Patents

Abstract

PURPOSE:To provide both productivity and attractiveness by properly changing over a shank thread for a button sewn on a clothing fabric between a wind thread shank by rounding upper thread and a wind thread shank by lock stitching of the shank thread. CONSTITUTION:A sewn button 151 is inclined to move an upper thread extending from a clothing fabric 153 nearly parallel to the upper surface of a feed bar 13 so that the parallel upper thread is subjected to a wind thread shank sewing by lock stitching of the upper thread carried by a needle 45. On the other hand, the clothing fabric 153 is subjected to antirun stitching near the sewn button 151 and further the needle 45 is stopped above the clothing fabric 153. A feed bar 13 is drivably rounded to provide a wind thread shank by the use of upper thread carried by the needle 45 so that the wind thread shank by the use of upper thread is performed. These means are properly selected, so that both attractiveness and productivity are established.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a neck-wrapping button sewing machine that performs neck-wrapping when sewing buttons onto work cloth.

[Prior Art] Conventionally, a neck-wrapping button sewing machine is equipped with a button holder that clamps the button from its outer periphery, attaches a root thread to the button with a sewing machine needle while the button is clamped by the button holder, and then attaches the root thread to the button. There was a method in which the button holder was reversed approximately 90 degrees so that the button was tilted with respect to the direction of the sewing machine needle, and the root thread was sewn in this state (Japanese Unexamined Patent Application Publication No. 6-117)
3-279873 (“Unfitted note method and device for button sewing machine”).

[Problems to be Solved by the Invention] In the conventional neck-wrapping button attaching device, the root thread is tilted in a direction intersecting the sewing machine needle, and the neck-wrapping is performed by a single chain stitch using the sewing action of the sewing machine needle. . In this way, the method of performing root wrapping by sewing has the advantage of high productivity, but a seam is formed around the outer periphery of the root thread, which does not look as good as hand wrapping (and sometimes the thread There was a problem of tangles occurring.In other words, conventional button sewing machines did not have a combination of productivity and good appearance.

The present invention aims to solve the above-mentioned problems of the conventional technology, and includes a neck wrapping method in which the root thread of a button sewn onto a fabric is wound around with a needle thread, and a neck wrapping method in which a lock stitch is performed on the root thread. An object of the present invention is to provide a neck-wrapping button-sewing machine that can selectively utilize both productivity and appearance by providing a configuration for appropriately switching the buttons.

[Means for Solving the Problems] The present invention, which has been made to solve the above-mentioned problems, includes a feed stand installed in a direction intersecting the reciprocating direction of a sewing machine needle carrying an upper thread. In a neck-wrapping button sewing machine that sews a button to a fabric with a lock stitch, cuts the thread, and then performs neck-wrapper sewing, the sewn button is tilted and the needle thread extending from the fabric to the button is passed through the feed table. A first neck wrapping means moves almost parallel to the upper surface and performs neck wrapping sewing with a lock stitch on the sewn needle thread, and a sewing machine needle performs a hill stitch near the sewn button. a second neck-wrapping means for stopping above the fabric and rotating a feed base so as to perform neck-wrapping with the needle thread carried by the sewing machine needle; and a selection means for selectively selecting the winding means.

[Function] In the neck-wrapping button sewing machine of the present invention, a button is sewn onto the fabric held on the feed table using a lock stitch by reciprocating movement of the sewing machine needle, and then neck-wrapper sewing is performed. As the neck wrapping sewing operation, the first neck wrapping means and the second neck wrapping means are alternatively selected by the selection means, that is, two types of neck wrapping can be performed.

That is, according to the first neck wrapping means, the sewn button is tilted and the needle thread extending from the fabric is moved so as to be almost parallel to the top surface of the feed table, and the needle thread is moved parallel to the upper surface of the feed base.
The upper thread carried on the sewing machine needle performs neck wrapping sewing using a lock stitch.

On the other hand, according to the second neck wrapping means, tacking is performed on the fabric near the sewn button, the sewing machine needle is stopped above the fabric, and the needle thread carried by the sewing machine needle is used to wrap the neck. The feed table is rotated so that the As a result, the needle thread is wrapped around the neck.

As described above, in the present invention, the first neck wrapping means and the second neck wrapping means can be appropriately selected in consideration of the points to be considered when attaching buttons, that is, the appearance and productivity.

[Example] Next, a preferred example of the present invention will be described in detail using the drawings.

FIG. 1 is a perspective view showing the main parts of a neck-wrapping button sewing machine as an embodiment of the present invention.

As shown in the figure, a neck wrapping button attaching device 1 is mounted on the base of the sewing machine in the front-back and left-right directions (in the figure, the direction indicated by arrow X is the forward direction, It is provided so as to be slidable in the direction indicated by y (leftward).

The main mechanism of this neck wrapping button attaching device 1 is that an upper plate 3 and a lower plate 5 are connected and fixed by a side plate 7, and a feed table 9 that can freely slide in the front, rear, right and left directions, and a feed plate 9 on the near side of the feed plate 9 A fabric guide mechanism 11 provided, a feed plate 13 fixed on the feed table 9, a presser foot lifting mechanism 19 that raises and lowers the presser foot 17 that clamps the fabric in cooperation with the feed plate 13, and a button holder that clamps the button. It is equipped with a mechanism 21 and a button guide mechanism 23 that scoops up and tilts the button, and each mechanism is operated by supplying compressed air to the cylinders that make up each mechanism in response to commands from an electronic control circuit, which will be described later. let

The dough guide mechanism 11 includes a dough guide back and forth movement cylinder 31 fixed to the lower plate 5 of the feed table 9, a U-shaped support member 35 fixed to the tip of a piston rod 33 of the dough guide back and forth movement cylinder 31, The fabric setting table 37 is mounted on the upper part of the support member 35. In addition,
The cylinder 31 for moving the fabric guide back and forth is moved by the movement adjustment screw 3.
By fixing the position of 9 with a fixing nut 4o, the amount of movement can be adjusted. Also, the fabric setting table 37 is fixed with a fastening screw 42 to the height set with a height adjusting screw 41. By being fixed, the height can be adjusted with respect to the support member 35.

According to the dough guide mechanism 11, the support member 35 and the dough setting table 37 are moved from the dough setting position (state a shown in the figure) toward the feed plate 13 by the operation of the cylinder 31 for moving the dough guide back and forth. The sewing machine stops at the sewing position between the presser foot 17 and the presser foot 17, that is, the operating position of the sewing machine needle 45,
After sewing is finished, return to the fabric setting position.

The presser foot lifting mechanism 19 includes a cylinder 51 for moving the presser back and forth, and a cylinder 55 for lifting the presser fixed to the tip of the piston rod 53 of the cylinder 51 for moving the presser back and forth.
The presser foot 17 is slightly moved in the front-back direction via the presser foot 17, and the presser foot 17 is raised and lowered by the operation of the presser foot lifting cylinder 55.

The button holder mechanism 21 includes a cylinder 63 for holder longitudinal movement fixed to the upper plate 3 of the feed base 9 by a fixing member 61, and a piston rod (not shown) of the cylinder 63 for holder longitudinal movement.
A holder lifting cylinder 7 is guided by a guide rod 69 fixed to the tip of the cylinder and supported by a guide bush 67.
1 and the piston rod 73 of the cylinder 71 for lifting and lowering the holder.
a connecting member 75 fixed to the tip of the connecting member 75;
The button holder 79 includes a holder support member 77 fixed to the lower end surface of the button holder 77, and a holder opening/closing mechanism 81 attached to the holder support member 77 to open and close the button holder 79.

According to the button holder mechanism 21, the button holder 79 is moved back and forth and up and down by the operation of the cylinder 63 for moving the holder back and forth and the cylinder 71 for raising and lowering the holder. That is, when attaching a button, the button holder 79 is moved to a sewing position below the sewing machine needle 45, and after sewing is completed, it is retracted to a retracted position as shown in the figure.

The holder opening/closing machine 1a81 has a link mechanism 86 that connects the tip of the piston rod 85 of the holder opening/closing cylinder 83 and the button holder 79. Spring (
The button holder 79 is opened against the spring force (not shown).

As shown in detail in FIG. 2, the button guide mechanism 23 includes a guide lateral movement cylinder 91 fixed to the upper plate 3 of the feed table 9, and a guide connection fixed to a piston rod 93 of the guide lateral movement cylinder 91. member 95 and a guide reversing cylinder 97 fixed to the other end of the guide connecting member 95
and a support plate 99 fixed to the guide reversal cylinder 97.
a guide elevating cylinder 101 fixed to the other end of the support plate 99; and a button fixed to one end of the piston rod 103 of the guide elevating cylinder 101 via a guide attachment member 105 and having a notch 107 at its tip. Guide 1
09, and the guide mounting member 105 is fixed to the support plate 99.
The guide is provided with an upper stopper 111 and a lower stopper 113 that regulate the amount of movement of the guide by abutting the ends thereof. According to the button guide mechanism 23, the button guide 109 is moved horizontally by the guide horizontal movement cylinder 91 integrally with the guide connecting member 95, the guide reversing cylinder 97, the guide lifting cylinder 101, etc. The button guide 109 is activated by the operation of the cylinder 101.
moves upward until it abuts on the upper stopper 111, as shown by the two-dot chain line, and is further rotated by the operation of the guide reversing cylinder 97. At this time, the button guide 109 is
Since it is separated by a predetermined amount from the center of rotation of the guide reversal cylinder 97, it is reversed at a predetermined radius.

The position of the upper stopper 111 can be adjusted in the vertical direction by loosening the screw 115. By adjusting this position, the turning radius of the button guide 109 can be set as desired, and the button of the button guide 109 can be adjusted as desired. The scooping amount is determined.

The control system of the button-wrapping sewing machine configured as described above will now be described.

FIG. 3 is a block diagram showing the main parts of such a control system. As shown in the figure, the control system includes an electronic control circuit 121 as its center.
1 is a well-known CPU 123° ROMI 25. RAM1
27, etc., and an input circuit 129, an output circuit 131, etc., which are connected to each other by a bus, as a logic operation circuit. The input circuit 129 includes a start switch 135 provided near the worker's feet;
A presser switch 137 and a selection switch 138 for selecting the type of neck wrapping described later are connected, and the output circuit 1
31 includes the aforementioned fabric guide mechanism 11, presser foot lifting mechanism 19, button holder mechanism 21, and button guide mechanism 2.
The solenoid valves, etc. of each cylinder of No. 3 are connected. The output circuit 131 also includes a stepping motor 139 that moves the neck wrapping button applicator 1 in the front-rear direction and the left-right direction.
141 is connected.

The electronic control circuit 121 configured as described above executes a button attachment control process for attaching neck wrapping buttons in response to commands from the start switch 135 and presser switch 137. This will be explained along the flowcharts of FIGS. 4 and 5.

In FIG. 4, when the process is started, a fabric setting operation is first performed to set the fabric in a predetermined position (step 200: hereinafter, "step" will be simply referred to as rsJ).

According to such dough setting work, the air chamber of the cylinder 31 for moving the dough guide back and forth is opened to the atmosphere, and the dough setting table 31 is opened to the atmosphere.
When the presser foot switch 137 is turned on after being brought into a free state where it can be moved manually,
Compressed air is supplied to the cylinder 31 for moving the fabric guide back and forth, and the cylinder 31 is operated to move the fabric setting table 37 forward, that is, toward the sewing position of the feed plate 13. When the fabric set in half is interposed between the feed plate 13 and the presser foot 17, and the presser switch 137 is stepped on, the presser foot lifting cylinder 55
is activated to press down the fabric set on the fabric setting table 37 with the presser foot 17.

Subsequently, the button longitudinal movement cylinder 63 of the button holder mechanism 21 is operated to advance the button holder 79 integrally with the button lifting cylinder 71, the connecting member 75, the holder supporting member 77, etc., and stop it at the button holding position. . In addition,
In this state, the operator manually sets the button in the groove of the button holder 79 by pushing the button holder 79 apart slightly against the spring force.

After the fabric setting work is completed in this way, the root thread attachment work for attaching the root thread to the button is executed (S210).
.

According to this thread installation work, the start switch 135
When turned on, the guide left/right movement cylinder 91 is operated to move the button guide 109 to the left so that it is located below the button, and the holder lifting/lowering cylinder 7 is activated.
1 to lower the button holder 79 slightly.

In this state, a sewing operation is performed by driving the main shaft of the sewing machine, and the button is attached to the fabric with a root thread formed therein. That is, as shown in FIG. 6(a), with the button holder 79 holding the button 151 above the fold line of the fabric 153, the sewing machine needle 45 is passed through the buttonhole and a sewing operation is performed, so that the button 151 is attached to the fabric. 153 with root threads formed. Thereafter, a thread cutting blade (not shown) cuts the thread from the root thread, and then the button holder 79 waits to return to its original position. After opening by the operation of 83, the cylinder 71 for raising and lowering the holder, the cylinder 63 for moving the holder back and forth, and the cylinder 83 for opening and closing the holder sequentially perform a raising operation, a retreating operation, and a closing operation.

After the root thread attachment work has been carried out in this way, the root thread is wrapped around the root thread (S220). Either the neck wrapping process by circumferential wrapping or the neck wrapping process by lock stitches 5242 and 5244 is selectively executed. That is, S
At step 222, when the neck wrapping process by circumferential wrapping is selected based on the position of the neck wrapping selection switch 138, the button guide 109 is moved from the position below the button 151 as shown in FIG. 6(b). , 5224, the button guide 10 is moved by the operation of the guide lifting cylinder 101.
9 to scoop up the button 151, and in this state, operate the guide reversing cylinder 97 to move the button guide 10 as shown in FIG. 6(c).
9 is reversed by approximately 90 degrees with respect to the direction of the sewing machine needle 45.

By raising and reversing the button guide 109 in this manner, the button 151 is placed out of the way when the sewing machine needle 45 is driven up and down. Continued <3226, sewing machine needle 45
is moved up and down several times to perform tacking stitches, and the sewing machine needle 45 is stopped above the fabric.

At the next step 8228, the guide reversing cylinder 97 is reversed approximately 90 degrees in the opposite direction to the rotational force direction, and the button guide 1
At 5230, the guide lifting cylinder 101 and the guide left/right movement cylinder 91 are operated to move the button guide 109 to the retracted position (Fig. 6(e)). . Thereafter, at 5232, the stepping motors 139 and 141 rotate the feed table 9 about 5 to 10 times. As a result, the root thread is damaged several times with the needle thread (Fig. 6(f)). Furthermore, at this time,
A thread tension device (not shown) is controlled to loosen so that the upper thread can be easily let out.

Subsequently, at 5234, the button guide 109 is moved to the left to support the button 151 with the button guide 109 (FIG. 6(g)). Furthermore, at 8236, button guide 10
9 by about 90 degrees, tilt the button 151, and then press the button 82.
At step 38, the sewing machine needle 45 is dropped and the stitches are sewn (FIG. 6(h)). In addition, when tacking, the thread tension device mentioned above is returned to its original high tension state. After completing such neck wrapping processing, the process moves to the next 8250 post-processing work.

On the other hand, when the neck wrapping process using the lock stitch is selected in 5222, the process advances to 5242.

5242, as shown in FIG. 7(a), the button guide 109 lifts the button 151 by operating the guide lifting cylinder 101, and further,
In this state, the guide reversing cylinder 97 is operated to move the button guide 109 approximately 9 degrees in the direction of the sewing machine needle 45.
Flip 0°.

By raising and reversing the button guide 109 in this manner, the root thread 157 is placed in a stretched state perpendicular to the direction of the sewing machine needle 45, that is, in the same direction as the fabric 153.

Subsequently, at 5244, the root thread is sewn by lock stitching. The neck wrapping sewing mentioned here is as shown in Fig. 7(b).
As shown in FIG.
By driving the neck wrapping button attaching device 1, the entire neck wrapping button attaching device 1 is moved left and right and in the front and back directions, and the upper thread and lower thread are sequentially moved from the second needle dropped on the button 151 side (position B in the figure) to the fabric 153 side. A sewing operation is performed to form a final seam with the thread, and finally it is dropped onto the fabric 153 side and stopped (position C in the figure). In addition, the stepping motors 139 and 141 are driven so that the swing width of the neck wrapping thread in the left-right direction in this neck wrapping work is set to be large on the button 151 side and set narrower as it goes toward the fabric 153 side. As a result, root wrapping can be performed reliably even for root threads that vary.

After one of the above-mentioned neck wrapping operations is performed, a post-processing operation is performed (S2O).

According to such post-processing work, the thread cutting blade (not shown) cuts the root wrapping thread, and then the guide horizontal movement cylinder 91 is operated to return the button guide 109 to the right side. The cylinder 97 and the guide raising/lowering cylinder 101 are operated to rotate the button guide 109 in the horizontal direction shown in the figure in the opposite direction to the direction reversed at 3310, and to lower the button guide 109. Next, operate the presser foot lifting cylinder 55 to raise and lower the presser foot 17.
to rise. Furthermore, the dough guide back and forth movement cylinder 3
After the air chamber 1 is opened to the atmosphere and the fabric setting table 37 is in a free state where it can be moved manually, the fabric guide back and forth movement cylinder 31 is operated to move the fabric setting table 37 back to the initial position. Bring it back.

After the post-processing work is completed in this way, the button attaching process is completed.

Therefore, in the above embodiment, as the neck wrapping work,
Two neck wrapping operations can be selected; in other words, the process of winding the upper thread around the root thread requires a slightly longer time because the stepping motors 139 and 141 drive the feed base 9 in rotation. However, it is possible to obtain root wrapping with a good appearance similar to manual wrapping.On the other hand, root wrapping with regular seams has a slightly inferior appearance but can be completed in a short time and is highly productive. Therefore, the neck wrapping method can be appropriately selected depending on the type and size of the button, and optimal neck wrapping can be performed.

In addition, in the above-mentioned circumferential winding, the needle thread is wound tightly around the root thread several times, and in the case of root wrapping using a regular stitch, the stitch is firmly formed by the needle thread and the bobbin thread, so that any root thread is tightly wound around the root thread. Even if it is wrapped, it is less likely to fray compared to conventional single chainstitch neck wrapping, and the button can be firmly attached.

[Effects of the Invention] As explained above, according to the present invention, it is possible to appropriately select between neck wrapping by winding the upper thread and neck wrapping by lock stitching, thereby achieving both good appearance and productivity. A neck-wrapping button sewing machine can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a neck wrapping button sewing machine according to an embodiment of the present invention, FIG. 2 is a perspective view showing the button guide mechanism, and FIG. 3 is a block diagram showing the main parts of the control system. Figure 4 is a flowchart showing the button attachment control process executed by the electronic control circuit, Figure 5 is a detailed flowchart showing the neck wrapping process, and Figures 6(a) to 6(d) are the thread attachment process. A perspective view showing the main part of the operation from the work to the neck wrapping work by round wrapping, Figures 6 (e) to 6 (h) are the same (a perspective view showing the main part of the neck wrapping work, Figure 7 is the same) It is a perspective view showing neck wrapping work by lock stitching. ...Neck wrapping button attaching device 9... Feed plate 1...
Fabric guide mechanism 17... Presser foot 9... Presser foot lifting mechanism
21...Button holder mechanism 3...Button holder mechanism 1...Fabric guide back and forth movement cylinder 7...Fabric setting table 45...Sewing machine needle 9/Button holder 81...Holder opening/closing mechanism 09...Button guide

Claims (1)

[Scope of Claims] A feeder is provided with a feeder installed in a direction intersecting the reciprocating direction of a sewing machine needle that carries an upper thread, and the fabric held on the feeder and a button are sewn together using a lock stitch and the thread is trimmed. Then, in a neck wrapping button sewing machine that performs neck wrapping sewing, the sewn button is tilted and the upper thread extending from the fabric to the button is moved almost parallel to the top surface of the feed table, and the upper thread is attached to the sewn upper thread. On the other hand, a first neck wrapping means performs neck wrapping sewing using a regular seam, and a sewing machine needle is stopped above the fabric by performing a tacking stitch near the sewn button, and the sewing machine needle is carried by the sewing machine needle. A second neck-wrapping means for rotating the feed base so as to wrap around the neck with a thread; and a selection means for selectively selecting the first neck-wrapping means and the second neck-wrapping means. This is a neck-wrapping button sewing machine.