JPH0424043A - Sewing machine for wind thread shank button - Google Patents

Abstract

PURPOSE:To provide a satisfactory wind thread shank to a button by a maintaining the button surely rising up from a clothing fabric in performing the wind thread shank operation. CONSTITUTION:While a button 151 is held above a fold of a clothing fabric 153 by a button holder 79, a needle 45 is inserted into a button hole to carry out a sewing operation so that the button 151 is attached to the clothing fabric 153 forming a thread shank. Next, under such a condition, a feed bar 13 is turned about the button 151 several times to perform a wind thread shank of the button with an upper thread. Thus, the button 151 can be as attractively and satisfactorily sewn as in the case of hand winding.

Description

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

[Prior art l] Conventionally, a neck-wrapping button sewing machine is equipped with a button holder that holds the button from its outer periphery, and the button held by the button holder is sewn near the crease of the fabric folded in half. It is known that after attaching the root thread, the button along with the button holder is tilted approximately 90 degrees with respect to the direction of the sewing machine needle, and in this state, the root thread is wrapped around the button (Japanese Patent Laid-Open No. 63-279873). (``Method and device for winding a button sewing machine'') as described in the official gazette.

When neck wrapping is performed using such a sewing machine, the appearance of the thread that has been wrapped around the neck is somewhat rugged compared to neck wrapping that is performed by an operator winding the thread around the thread. Therefore, the applicant of this application,
A neck wrapping button sewing machine that can perform neck wrapping similar to manual neck wrapping by rotating the fabric setting table containing the fabric to be buttoned together with the feed table around the sewing machine needle. developed.

[Problem to be Solved by the Invention 1] By the way, in this neck-wrapping button sewing machine, before the neck-wrapping work is performed by rotating the feed table, the button sewn onto the fabric is tilted once, and then the button is sewn on. It is necessary to perform a tacking stitch near the base of the thread (so-called root thread) and then raise the button again. In conventional neck-wrapping button sewing machines, the button is tilted by tilting the button holder, etc. It is possible to use this configuration as is to raise the button, but in that case, there are the following problems: This is not a realistic solution.

That is, as shown in Fig. 10, the button B is sewn to the folded part of the fabric N using upper thread and lower thread, so after raising the button B with a button holder etc. If the button holder and the like are retracted, the button B will fall down due to its own weight and the elasticity of the thread itself, creating a problem that it will be difficult to wrap the needle thread around the neck.

The present invention aims to solve this problem, and the present invention aims to solve this problem by rotating the feed base (
As a result, there is provided a neck-wrapping button sewing machine which can suitably perform neck-wrapping by turning the upper thread.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention adopts the configuration shown below as a means for solving the problems.

That is, the neck wrapping button sewing machine of the present invention includes a fabric setting table on which the button sewing fabric is folded in half and mounted;
A pressing member for pressing the sewing machine needle side of the fabric folded in half against the fabric setting table from above is provided on a feed table movable in a direction intersecting the vertical reciprocating movement of the sewing machine needle, and a pressing member is provided above the fold line of the fabric. , a neck-wrapping button sewing machine in which the button is prepared so as to be movable with the fabric, and the button is sewn with a needle thread near the fold of the fabric by moving the feed base in accordance with the reciprocating movement of the sewing machine needle; , button tilting means for tilting the button after the button is sewn with the needle thread; and a stopper for sewing the button near the base of the needle thread sewing the button onto the fabric after the button tilting means tilts the button. sewing means; fabric setting table retracting means for retracting the fabric setting table by a predetermined amount of movement from inside the folded fabric in a direction opposite to the fold line after the tacking is completed; and the fabric setting table starts retracting. and a pressing member moving means for moving the pressing member in the same direction as the retraction direction of the fabric setting table, and a pressing member moving means for moving the pressing member, and after the movement of the pressing member is completed, the one end is sewn with a stop stitch. The sewing machine is characterized by comprising a feeding table rotating means for rotating the feeding table around the button in a state in which the upper thread is stretched between the needle thread and the sewing machine needle.

(Function 1) The neck wrapping button sewing machine of the present invention folds the button sewing fabric in half and attaches it to the fabric setting table provided on the feed table which is movable in the direction intersecting the up and down reciprocating movement of the sewing machine needle. The sewing machine needle side of the fabric is pressed from above against the fabric setting table by a pressing member.Furthermore, by moving the feeding table along with the reciprocation of the sewing machine needle, it can be moved together with the fabric above the fold line of the fabric. Sew the prepared button near the fold of the fabric using needle thread.

After sewing the button with the upper thread, the button tilting means tilts the button, and the tacking means sews the button near the base of the upper thread sewing the button onto the fabric.

After the tacking stitching is completed in this way, the fabric setting table retracting means moves the fabric setting table away from the inside of the folded fabric by a predetermined distance in the direction opposite to the fold line, and after the fabric setting table starts retracting, By the pressing member moving means,
The pressing member is moved in the same direction as the retracting direction of the fabric setting table by a distance greater than the movement amount of the fabric setting table. The buttoned fabric is pulled in the opposite direction to the fold, and the button on the fold is raised against the fabric.

After the movement of the pressing member is completed, the feed table is rotated around the button by the feed table rotation means, with the upper thread, one end of which is sewn, stretched between the needle and the sewing machine needle. As a result, the upper thread is wound around the root thread, thereby performing root wrapping.

[Embodiment] Next, a preferred embodiment 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, A fabric guide stand 37 placed on the upper part of the support member 35, and a spring return type guide stand fine movement cylinder 39 whose cylinder rod 38 protrudes from the lower part of the support member 35 toward the end face of the cylinder 31 for moving the fabric guide back and forth. It is equipped with

According to the dough guide mechanism 11, the support member 35 and the dough guide stand 37 are fed from the dough setting position (the state shown in the figure) by the operation of the dough guide back and forth movement cylinder 31 until the cylinder rod 38 comes into contact with the stop bolt 32a. It moves to the button stop position on the plate 13 side, stops at the sewing position between the feed plate 13 and the presser foot 17, and returns to the fabric setting position after sewing is completed. Further, by the operation of the guide stand fine movement cylinder 39, the support member 35 and the fabric guide stand 37 are slightly retracted from the button stop position on the feed plate 13 side, or moved forward and returned to the button stop position.

In addition, as shown in FIGS. 2 and 3, the fabric setting table 37 is fixed by moving the stop bolt 32a back and forth to a desired position and fixing it with the fixing nut 32b.
The amount of movement in the back and forth direction can be adjusted, and by moving the height adjustment screw 41 forward and backward to achieve the desired height, sliding the long length and fixing it with the fastening screw 42, the support member 35 can be adjusted. Height can be adjusted.

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 longitudinal holder 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 the button, the button holder 79 is moved from the illustrated state to the sewing position below the sewing machine needle 45, and after sewing is completed, it is retracted to the illustrated retracted position.

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. 4, 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 10 is activated by the operation of the lifting cylinder 101.
9 rises until it comes into contact with 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, since the button guide 109 is separated by a predetermined amount from the center of rotation of the guide reversing cylinder 97, the button guide 109 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. 5 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. RAM
127, 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. 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.

Each of the cylinders is operated by supplying compressed air by switching solenoid valves according to commands from the electronic control circuit 121, and the fabric guide back and forth movement cylinder 31. Guide stand fine movement cylinder 39. An air circuit for operating the cylinder 51 for moving the presser foot back and forth, etc. will be explained with reference to FIG. 6.

The pressure port 171 of the air pump is connected to a pressure regulating circuit 179 consisting of an on-off valve 173, a filter 175, and a pressure regulating valve 177, from which air is supplied to each of the above cylinders via a manifold 181 as follows. Ru.

In the fabric guide back and forth movement cylinder 31, the first is a magnetic valve 183a, a regulator 184 that reduces the pressure of compressed air from 5 kg/cn (to 2 kg/cm!), a variable throttle 185a, and a check valve 187a are connected to each other. is connected to one air chamber 31a, and the 21st! magnetic valve 183
b, is connected to the other air chamber 31b via a circuit consisting of a variable throttle 185b and a check valve 187b.

The first solenoid valve 183a and the second solenoid valve 183b connect the atmosphere open boat A and the pressure boat P to the electronic control circuit 121.
Both solenoid valves 183a and 183b enter the free mode of atmospheric pressure release in the illustrated position, thereby making it possible to move the fabric setting table 37 freely manually. , first solenoid valve 18
3a is connected to the pressure boat P and the second solenoid valve 183b is connected to the atmosphere release boat A, the transfer mode is set, compressed air is supplied to the air chamber 31a, and the fabric setting table 37
moves to the sewing position, the second solenoid valve 183b is moved to the pressure boat P, and the first solenoid valve 183a is moved to the atmosphere open boat A.
If the air chamber 31 is connected to the
Compressed air is supplied to b, and the fabric setting table 37 returns to the fabric setting position. Note that the variable throttle valves 185a, 1
85b acts to dampen the speed of piston movement and its impact.

The spring return type guide stand fine movement cylinder 39 is connected to one air chamber 39a via the 311i magnetic valve 183c.

The 31st magnetic valve 183C switches between the atmospheric open boat A and the pressure boat P based on a signal from the electronic control circuit 121, and is normally in the free mode of atmospheric pressure open at the illustrated position.

However, when the third solenoid valve 183c switches to the pressure boat P, it supplies compressed air to the air chamber 39a and enters the fine movement mode. Move back slightly from position. Then, when the free mode is set to open to the atmosphere, the fabric setting table 37 is advanced to the button stop position and returned to that position. The reason why the fabric setting table 37 can be moved back and forth from the button-fastening position in this way is that the compressed air pressure to the cylinder 31 for moving the fabric guide back and forth is reduced by the regulator 184 described above.

In the cylinder 51 for moving the presser foot back and forth, the fourth solenoid valve 18
3d to the air chambers 51a and 51b.

The fourth electromagnetic valve 183d is provided with boats A and B open to the atmosphere with the pressure boat P in between, and switches each boat based on a signal from the electronic control circuit 121, so that the air chamber 51b is opened to the atmosphere in the illustrated position. The presser forward mode is entered in which the air chamber 51a is opened and air is supplied to the air chamber 51a.
This moves the presser 17 forward in the direction indicated by X in FIG. Further, when the fourth solenoid valve 183d is switched and the air chamber 51a is opened to the atmosphere and air is supplied to the air chamber 51b, the presser retreat mode is entered, whereby the presser 17 moves in the direction indicated by X in FIG. retreat in the opposite direction.

That is, the presser 17 retreats from the pressing position shown in FIG. 1 when the button is fastened, or moves forward and returns to the pressing position.

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. will be explained along the flowcharts of FIGS. 7 and 8.

First, the button attachment control process will be explained.

In FIG. 7, 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 "S").

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 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. 9(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. 153 with root threads formed. Thereafter, a thread cutting blade (not shown) cuts the thread from the root thread, and the button holder 79 returns 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 is performed in this way, the root thread is wrapped around the root thread (S220). As the neck wrapping work, as shown in detail in the flowchart of FIG. 8, first at 5222, From the state where the button guide 109 is located below the button 151 as shown in FIG. In this state, the guide reversing cylinder 97 is operated to reverse the button guide 109 approximately 900 degrees with respect to the direction of the sewing machine needle 45, as shown in FIG. 9(C). 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. At step 3224, the sewing machine needle 45 is moved up and down several times to perform tacking stitches (see Fig. 9).
C)) Stop the sewing needle 45 above the fabric. next 52
At step 26, the guide lateral movement cylinder 91 is operated to move the button guide 109 to a retracted position (not shown).

Thereafter, at 5228, the guide table fine movement cylinder 39 is driven in the fine movement mode to slightly retract the fabric setting table 37 from the button hill position as shown in FIG. 9(d). Note that this amount of retraction is approximately 2.5 mm.

Next, at 5230, the cylinder 51 for moving the presser foot back and forth is driven, and as shown in FIG. The fabric that has been folded above the guide table 37 is shifted to make the button 151 stand up against the fabric. Then, in the continuation (S232), the stepping motor 139, 141 rotates the feed table 9 about 5 to 10 times. As a result, the root thread is wound several times with the upper thread (FIG. 9(f)) At this time, a thread tension device (not shown) is controlled to loosen so that the upper thread can be easily let out.

Next, at 5234, the 41st! Press the magnetic valve 183d and switch to the forward mode to drive the presser foot forward and backward moving bed cylinder 51, and move the presser foot 17 approximately 5 mm as shown in FIG. 9(g).
advance. Thereafter, at 5236, the third solenoid valve 183
c is switched to the free mode, and as shown in FIG. 9(h), the fabric setting table 37 is advanced by about 2.5 mm to return to the button fastening position. In this way, the button 151 is tilted relative to the sewing machine needle 45.

In this state, the sewing machine needle 45 is further dropped at 5238 to perform locking stitches. 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.

According to such post-processing work, the root wrapping thread is trimmed using a thread cutting blade (not shown), and then the guide reversing cylinder 97 and the guide lifting cylinder 101 are operated to return the button guide 109 to the initial position. Bring it back. Subsequently, the presser foot lifting cylinder 55 is operated to raise the presser foot 17. Furthermore, after opening the air chamber of the fabric guide back-and-forth movement cylinder 31 to the atmosphere and setting the fabric setting table 37 in a free state where it can be moved manually, the fabric guide back-and-forth movement cylinder 31 is operated, and the fabric setting table 37 Retract and return to the initial position.

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

Therefore, according to the embodiment, since the button 151 is reliably maintained in a state in which it stands up against the fabric during the neck-wrapping operation, the button's root-wrap can be preferably performed by rotating the feed table. , can be performed while maintaining the same appearance as manual work.

In addition, with circumferential neck wrapping, the needle thread is tightly wrapped around the root thread (because it is wrapped several times, it is less likely to fray due to the up and down reciprocating motion of the sewing machine needle than traditional neck wrapping using single chain stitch), and the button is firm. It also has the effect of being able to be attached to.

[Effects of the Invention] As explained above, according to the present invention, the fabric on which the button has been sewn is set on the feed stand, and the feed stand is moved around the button with the button firmly standing up against the fabric. Since the upper thread is used to wrap the button around the button several times, the button can be properly attached with a good appearance, just like when the button is wound by hand.

[Brief explanation of drawings]

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 front view showing the fabric guide mechanism, and FIG. Fig. 4 is a perspective view showing the button guide mechanism, Fig. 5 is a block diagram showing the main parts of the control system, Fig. 6 is an air circuit diagram, and Fig. 7 is an electronic control circuit. Flowchart showing the button attachment control process, FIG. 8 is a flowchart for explaining the control process in detail, FIGS. 9(a) to 9(
h) is a perspective view showing the main parts of the operation from thread attachment to neck wrapping, and FIG. 10 is an explanatory diagram for explaining the problems of the prior art. 1...Neck wrapping button attaching device 9...Feeding plate 11.
... Fabric guide mechanism 17... Presser foot 19... Presser foot lifting mechanism 21... Button holder mechanism... Button guide mechanism... Cylinder for moving fabric guide back and forth... Fabric setting table... Guide table fine movement Cylinder... Cylinder for moving the presser foot back and forth Button holder 81... Holder opening/closing mechanism 9... Button guide

Claims (1)

[Scope of Claims] 1. A fabric setting table on which the fabric for button attachment is folded in half and mounted, and a pressing member that presses the sewing machine needle side of the fabric folded in half onto the fabric setting table from above, Provided on a feed stand movable in a direction intersecting the up and down reciprocating movement of the sewing machine needle, a button is provided above the fold line of the fabric so as to be movable together with the fabric, and the feed stand moves along with the reciprocating movement of the sewing machine needle. A button tilting means for tilting the button after the button is sewn by the needle thread in a neck-wrapping button sewing machine that sews the button near the fold line of the fabric by moving the needle thread, and a button tilting means for tilting the button after the button is sewn by the needle thread; a tacking means for tacking near the base of the needle thread sewing the button to the fabric after the button is tilted; fabric setting table retracting means for retracting a predetermined amount of movement in a direction opposite to the fold line; and after the fabric setting table starts retracting, the pressing member is moved in the same direction as the retraction direction of the fabric setting table by a distance greater than the amount of movement. a means for moving a pressing member; after the pressing member has completed its movement, the upper thread, the one end of which is sewn, is stretched between the needle and the sewing machine needle; A neck-wrapping button sewing machine, characterized in that it is equipped with feed table rotation means for rotating the button.