JPH0417883A - Stem-winding button sewing machine - Google Patents

Abstract

PURPOSE:To prevent a needle from being located between stem threads and uniformly wind stem-thread around a thread-stem by a method wherein a button guide is capable of moving a button, which is attached on a fabric with stem- thread, away from the fabric and of tilting it at an angle at which stem-winding can be performed. CONSTITUTION:A button guide 109 is moved up by the action of a guide elevating cylinder 101 until it comes in contact with an upper stopper 111 as shown by dotted lines, and further turned by the action of a guide turning cylinder 97. At this time, the button guide 109 is a specified distance apart from the rotation center of the turning cylinder 97, causing the button guide to turn with a specified radius. The position of the upper stopper 111 is vertically adjustable by loosening a screw 115 so that the rotation radius of the button guide 109 can be set to a desire one by adjusting the position of the upper stopper and the button scooping-up amount of the button guide 109 is determined. Thus, the stem-thread is directed perpendicularly to the needle direction, that is, parallel to the fabric, with the stem-thread kept in a tense state by the rising and turning actions of the button guide 109. After that, stem-winding is performed on the thread--stem.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a neck-wrapping button sewing machine that performs neck-wrapping when sewing buttons onto processed fabric, and more specifically, a button guide for reversing buttons with threads attached. Regarding the mechanism.

[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 about 90' and 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, "Neck winding method for button sewing machine and device J)".

[Problems to be Solved by the Invention] However, in the conventional neck-wrapping button sewing machine, the button holder itself is configured to be reversed by 90 degrees around the position of the button holder. However, because the root thread attached to the button is attached in a loose state,
If the button is simply reversed using a conventional button holder, the root thread will remain loose and tilt at right angles to the needle drop direction.

For this reason, during the root wrapping work, the sewing machine needle may fall between the loosened root threads, causing the problem that the root wrapping thread cannot be evenly wrapped around the outside of the root threads.

An object of the present invention is to solve the problems of the conventional technology, and by providing a button guide that is driven to stretch the root thread, the outer circumference of the root thread can be uniformly wrapped, and the button guide is driven to stretch the root thread. To provide a neck-wrapping button sewing machine that can securely attach a neck-wrapping button.

[Means for Solving the Problems] The neck-wrapping button sewing machine of the present invention, which has been made to solve the above-mentioned problems, holds and tilts a button with a root thread attached to a button guide, and performs neck-wrapping against the root thread. In a neck-wrapping button sewing machine that performs neck-wrapping, the button guide is driven by a moving means for moving the button with the root thread attached in a direction away from the fabric, and a reversing means for tilting the button to an angle that allows neck-wrapping. It is characterized by the following structure.

[Function] In the neck wrapping button sewing machine of the present invention, neck wrapping is performed after the button is attached to the fabric with the root thread. At this time, the button is moved by the button guide driven by the moving means and the rotating means. It is tilted as if the root threads are stretched.

That is, the button guide holds the button by the moving means and moves in a direction away from the fabric to tension the root thread, and further tilts the button with the stretched root thread by the rotating means.

Therefore, since the root threads can be wrapped in a taut state, there is no need to drop the needle between the root threads, which tends to occur when the root threads are loosened. Example 6 Next, a preferred example of the present invention will be described in detail with reference to 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 cooperates with the feed plate 13 to raise and lower the presser foot 17 that clamps the fabric, and a button that clamps the button. It is equipped with a holder mechanism 21 and a button guide mechanism 23 that scoops up and tilts the button, and operates each mechanism 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 forward and backward positions of the fabric setting table 9 with a fixing nut 40, the amount of movement of the fabric setting table 37 can be adjusted. By fixing with the support member 35, the height can be adjusted.

According to the dough guide mechanism 11, the support member 35 and the dough setting table 37 are moved from the dough setting position (the state shown in the figure) toward the feed plate 13 by the operation of the cylinder 31 for moving the dough guide back and forth. Stops at the sewing position between 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.

The holder opening/closing mechanism 81 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. The button holder 79 is opened against the force of a spring (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. as the center, and an input circuit 129, an output circuit 131, etc. are connected to each other by a bus as a logic operation circuit. And in the input circuit 129,
Start switch 135 installed near the worker's feet
and presser switch 137 are connected, and output circuit 131
The above-mentioned fabric guide mechanism 11 and presser foot lifting mechanism 19 are included.
, the solenoid valves and the like of each cylinder of the button holder mechanism 21 and the button guide mechanism 23 are connected. The output circuit 131 also includes stepping motors 139 and 14 that move the neck wrapping button application device 1 in the front-rear direction and the left-right direction.
1 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 flowchart of FIG.

First, the button attachment control process will be explained.

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 dough guide back and forth movement cylinder 31 is opened to the atmosphere and the dough setting table 37 is
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 has been performed in this manner, the root thread attachment work for attaching the root thread to the button is then performed (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. 5(a), with the button holder 79 holding the button 151 above the fold line of the fabric 153, the button 151 is sewn by passing the sewing machine needle 45 through the buttonhole. 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 attaching work has been performed in this manner, a neck wrapping work for performing neck wrapping sewing on the root thread is performed (S220).

By the way, as a result of the root thread attachment work, as shown in FIG. 5(b), the button guide 109 below the button 151 is positioned with the root thread passing through the notch 107 thereof.

From this state, first, the button guide 109 is raised to scoop up the button 151 by operating the guide lifting cylinder 101, and furthermore, in this state, the guide reversing cylinder 97 is operated, as shown in FIG. ), the button guide 109 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 root thread 157 is placed in a stretched state perpendicular to the direction of the sewing machine needle, that is, in the same direction as the fabric 153. Thereafter, root wrapping sewing is performed on the root thread. As shown in FIG. 5(d), the neck wrapping sewing referred to here means that the first needle is first dropped to the side of the fabric 153 (A in the figure).
), by driving the step motors 139 and 141, the entire neck wrapping button attaching device 1 is moved left and right and in the front and rear directions, and the fabric is removed from the second needle (position B in the figure) dropped on the button 151 side. Sewing work is performed by lockstitching to form a seam using the upper thread and the lower thread in order from the 153 side, and finally, it is dropped to the fabric 153 side and stopped (position C in the figure).

In addition, in this neck wrapping work, the swing width of the neck wrapping thread in the left and right direction is set to be large on the button 151 side, and
The step motors 139, 141 are driven so as to set the width narrower toward the third side, and as a result, it is possible to reliably wrap the root threads even with uneven root threads.

After the neck wrapping work is performed in this manner, a post-processing work is performed (S230).

According to such post-processing work, the root-wrapping thread is trimmed using a thread cutting blade (not shown), and after the thread trimming, the guide left/right movement cylinder 91 is operated to return the button guide 109 to the right side. Thereafter, the guide reversing cylinder 97 and the guide elevating cylinder 101 are operated to rotate and lower the button guide 109 in the opposite direction to the direction reversed at 3310 so that it becomes horizontal as shown. Subsequently, the presser foot lifting cylinder 55 is operated to raise the presser foot 17. Next, the air chamber of the dough guide back and forth movement cylinder 31 is opened to the atmosphere to make the dough setting table 37 free to be moved manually, and then the dough guide back and forth movement cylinder 31 is operated to move the dough setting table 37 to the atmosphere. Retract and return to the initial position.

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

In the above embodiment, the button guide 109 holds the button by the holder lifting cylinder 101 and moves in a direction away from the fabric to tension the root thread, and in this state,
The button is tilted by rotation of the button rotation cylinder 97.

Therefore, since the root wrapping work can be performed with the root threads stretched, there is no needle drop between the root threads, which tends to occur when the root threads are loosened, and the root thread can be wound evenly around the outside of the root threads. Therefore, the button can be firmly attached to the fabric.

Further, the length of the root thread is determined depending on the size of the button, but in this embodiment, by changing the position of the upper stopper 111 of the guide lifting cylinder 101 with the screw 115, it is possible to can correspond to

Furthermore, in a conventional sewing machine, when a lifting mechanism is installed in parallel with a button holder for setting a button, a multi-key configuration is created, but in this embodiment, the button guide 109 is separated from the button holder mechanism 21, Since the button guide 109 is a button guide mechanism 23 that moves up and down and reverses, the configuration is simple.

[Effects of the Invention] As explained above, according to the neck-wrapping button sewing machine of the present invention, the button guide is provided with the moving means and the reversing means, so that the neck-wrapping work can be performed by tensioning the root thread with the button guide. Since this can be done, there is no need for the needle to fall between the root threads, and the root threads can be wrapped uniformly, making it possible to securely attach the button to the fabric.

[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. Fig. 4 is a flowchart showing the button attachment control process executed by the electronic control circuit, and Figs. 5(a) to 5(d) show the main parts of the operation from thread attachment to neck wrapping. FIG. ■...Neck wrapping button attaching device 9...Feeding plate 11.
... Fabric guide mechanism 17... Presser foot 19... Presser foot lifting mechanism 21... Button holder mechanism 23... Button guide mechanism 1... Cylinder for back and forth movement of fabric guide 9... Button holder 81... Holder Opening/closing mechanism 7・
・Guide reversal cylinder (reversing means) 01... Guide elevating cylinder (moving means) 09... Button guide

Claims (1)

[Claims] In a neck-wrapping button sewing machine in which a button with a root thread attached thereto is held and tilted in a button guide to perform neck wrapping on the root thread, the button guide holds the button with a root thread attached thereon. A neck-wrapping button sewing machine, characterized in that it is driven by a moving means that moves in a direction away from the fabric and a reversing means that tilts the button to an angle that allows neck-wrapping.