CN1149310C - Chain type stitch button sewing machine - Google Patents

Abstract

To provide a chain stitch button sewing machine capable of obtaining stable thread tightening and a surplus thread of a constant length when a button is fastened to an object to be sewn. A control mechanism (30) is provided, and the control mechanism (30) can control the driving mechanisms (32, 33) of the thread cutting device for cutting thread and the driving mechanism (32) of the push-up device for pushing up the button after the chain stitch, so that the driving of the sewing machine mechanism is started at the same time or just after the stopping of the driving.

Description

Chain Stitch Button Sewing Machine

technical field

The invention relates to a chain stitch button sewing machine which performs button stitching through chain stitches in the process of thread tightening, thread cutting and pushing up.

Background technique

Fig. 8 is an explanatory diagram of main components of a conventional chain stitch button sewing machine for sewing buttons by chain stitch.

This chain stitch sewing machine is a sewing machine called a circular chain stitch sewing machine, and is driven once in a cycle by a mechanism that rotates a rotating body having an eccentric rotating shaft to implement a predetermined pattern of sewing a button on an object to be sewn. Chain stitch, and has a mechanism that can automatically stop the action of each device such as the thread tensioning device, thread cutting device, and push-up device that constitute the chain stitch button sewing machine in each of the above-mentioned cycles.

Below, the structure of the existing chain stitch button sewing machine is briefly described.

The sewing machine has a swing arm 2 extending in the horizontal direction and swinging in the vertical direction through a swing fulcrum 1 formed at a middle portion in the longitudinal direction.

In addition, the above-mentioned thread tightening device has a thread tightening rotating arm 4 that is formed in a substantially ㄑ shape and rotates in the vertical direction with its curved part as a pivot point 3. One end of the thread tightening rotating arm 4 is connected to the swing arm 2 The needle bar not shown in the figure is connected to one end on the opposite side to the direction in which the needle bar is arranged. Further, the other end of the thread tightening rotating arm 4 is connected to one end of a thread tightening arm 5 extending substantially parallel above the swing arm. On the upper surface of the other end of the above-mentioned thread tightening arm 5, a concave engaging portion 6 is formed, and the engaging pin 8 of the thread tightening member 7 engages therewith.

As shown in Figure 9, the above-mentioned thread tightening member 7 is made into a substantially L-shaped planar shape, with one end pointing to the direction of the needle bar not shown, and can rotate in the horizontal direction with its bent part as the pivot point 9. be supported. A thread hole 10 through which the upper thread of the sewing machine passes is formed on the bottom of this end, and the above-mentioned engaging pin 8 is formed on the bottom of the other end. A standing portion extending in the vertical direction may also be formed on the thread tightening member 7 (see FIG. 3 ).

In this way, by sliding the above-mentioned thread tightening arm 5 to the disposition direction of the needle bar not shown, the locking pin 8 engaged with the above-mentioned concave engagement part 6 can be pushed to the needle bar disposition direction, so that the above-mentioned tensioner The thread member 7 is centered on the above-mentioned fulcrum 9, and the end portion formed with the above-mentioned thread hole 10 is rotated in the horizontal direction in the direction opposite to the arrangement of the above-mentioned thread tightening arm 5, thereby, the upper thread that will pass through the above-mentioned thread hole 10 is played. tensioning effect.

The thread cutting device has a substantially L-shaped thread cutting rotating arm 11 arranged below the above-mentioned swing arm 2, and the thread cutting rotating arm 11 is vertically rotatably supported with its bent portion as a rotating fulcrum 12. At one end of the above-mentioned thread cutting rotating arm 11, a first connecting arm 13 for connecting it to the end of the above-mentioned swinging arm 2 connected to the above-mentioned thread tightening rotating arm 4 is arranged. In addition, on the other end of the above-mentioned thread cutting arm 11, the thread cutting arm 15 is connected through the second connecting arm 14, so that the thread cutting member 16 formed on the front end of the thread cutting arm 15 is located below the sewing machine table not shown. near the bottom of the needle bar.

And, when the above-mentioned thread-cutting rotating arm 11 rotates clockwise in Fig. 8, the above-mentioned second connecting arm 14 and thread-cutting arm 15 push out the above-mentioned thread-cutting member 16 to the bottom of the needle bar, so that the thread cutting member 16 can be positioned under the sewn object. On line cut off.

The push-up device is disposed between the above-mentioned swing arm 2 and the above-mentioned thread cutting device, and a fulcrum 19 for rotation is formed on the take-out portion 18 formed on the bottom of one end of the push-up base 17, so as to be able to rotate vertically through the fulcrum 19. get braced.

On the front end of the other end of the above-mentioned push-up base 17 , a fork-shaped push-up member 22 composed of two pick-up arms 21 is disposed via a mounting table 20 . In addition, on the upper surface of the other end of the above-mentioned push-up base 17, a J-shaped engaging rod 23 opening downward in the front end direction is formed. The bottom surface of one end hangs down, and the front end of the swing arm side engaging rod 24 is bent in a substantially J-shape.

In this way, when the swing arm 2 swings around the swing fulcrum 1, the end portion provided with the swing arm-side engagement lever 24 is lifted upwards, so that the lock contacting the swing arm-side engagement lever 24 The combined rod 23 also rises to a predetermined position, so that the above-mentioned push-up base 17 rotates around the above-mentioned pivot point 19 and lifts the front end portion of the above-mentioned push-up member 22 upwards, so that the above-mentioned push-up member 22 can be lifted upwards. The button held by the pick arm 21 is pushed up.

In addition, a drive arm 25 extending in the vertical direction is connected to the end of the above-mentioned swing arm 2 connected to the above-mentioned thread tightening rotating arm 4 and the first connecting arm 13 of the thread cutting device. In the vicinity of the lower end of the drive arm 25 is formed an engaging portion 26 which is engaged with a transmission member 28 which transmits the rotation of the eccentric rotating body 27 constituting the driving mechanism of the chain stitch button sewing machine. Section 29.

Then, when the engaging portion 29 of the transmission member 28 is engaged with the drive arm 25, the drive arm 25 is pulled downward, which acts to pull down one end of the swing arm 2 to swing the swing arm 2, and through this action, The thread tightening rotating arm 4 and the thread cutting rotating arm 11 are rotated.

As mentioned above, the structure of the existing chain stitch button sewing machine is that each device such as thread tightening, thread cutting, and pushing up is driven by pulling one end of the swing arm 2 downward.

Fig. 10 shows a time sequence diagram of the driving shaft, thread tensioning device, thread cutting device and push-up device in this conventional chain stitch button sewing machine from start to stop. In the timing chart, for a tight thread, the timing of the movement of the thread hole 10 is shown, for a tangent thread, the timing of the thread cutting member 16 is shown, and for the push-up, the timing of the push-up member 22 rising is shown.

As shown in the figure, in the prior art, while driving the drive shaft of the chain stitch button sewing machine, thread tension, thread trimming, and push-up are in a standby state (OFF). Before a structural cycle drive of the drive shaft is about to end, the up and down movement of the transmission member 28 generated by the rotation of the eccentric rotating body 27 is transmitted to the drive arm 25, thereby pushing the drive arm 25 downwards, so that the wire tightening device, Start the thread cutting device together (a1), first, make the thread hole 10 for tightening the thread and the thread cutting member 16 for thread cutting start to move at the same time (e1, f1), and after the thread cutting is completed (f2), push up the push-up member 22 Start action (g1). Then, at the same time as one cycle of the drive shaft is completed ( a2 ), the driving of the thread hole 10 and the push-up member 22 is stopped ( e2 , g2 ).

The reason why the timings of thread tightening, thread cutting, and push-up are different is that the transmission paths from the drive arm 25 to the thread hole 10, the thread-cutting member 16, and the push-up member 22 as respective action bodies are different.

However, in the above-mentioned existing chain stitch button sewing machine, the drive shaft is used as the driving source of each device, and therefore, thread tightening, thread cutting, and push-up must all be carried out before the drive shaft is about to stop. Therefore, the actions in the thread tightening process, thread trimming process, and push-up process overlap. For thread tightening, if the timing of thread trimming is advanced, the thread will not be fully tightened, resulting in loose stitches in the end.

In addition, in the timing of thread tangent and push up, if the push up is earlier than the thread tangent, the remaining thread will become longer, and if the push up is too early, the upper thread will bear excessive tension, and even the upper thread will break.

Contents of the invention

The present invention is developed in view of the above-mentioned problems, and its purpose is to provide a chain stitch button sewing machine capable of stably tightening the thread and maintaining a certain length of remaining thread when buttoning the object to be sewn.

In order to achieve the above object, the present invention provides a chain stitch button sewing machine, which is used to make buttons on the sewing object through chain stitches, and has a thread tightening device for tightening the stitched upper thread, and a device for cutting the upper thread. The thread cutting device and the push-up device for pushing up buttons are characterized in that the button sewing machine includes: an actuator as a driving source; a driving arm operated by the actuator; The action mechanism of the push-up device that pushes up the button after the type stitch; the action mechanism of the thread-cutting device that performs the above-mentioned thread-cutting by rotating the arm according to the action of the above-mentioned driving arm; The actuating mechanism of the above-mentioned push-up device and the actuating mechanism are driven; and the control mechanism that drives when the driving of the above-mentioned sewing machine mechanism stops or immediately after stopping.

According to the present invention, thread trimming and push-up are performed sequentially after proper thread tightening before the drive of the sewing machine mechanism is stopped, so that a surplus thread of a constant length can be obtained.

In addition, according to the present invention, the chain stitch button sewing machine can be miniaturized by reducing the number of parts, and it is possible to realize the control at low cost, that is, the above-mentioned thread trimming is sequentially performed at the same time as the driving of the above-mentioned sewing machine mechanism is stopped or immediately after the stop. The drive of the drive mechanism of the device and the drive mechanism of the push-up device start.

As described above, according to the chain stitch button sewing machine related to the present invention, there is an effect that a stable tight thread and a constant length of surplus thread can be obtained, and by sharing the driving source of each device, not only can reduce The number of parts constituting the chain stitch button sewing machine can be reduced in size, and the cost can be reduced.

Description of drawings

Fig. 1 is a timing diagram of a drive shaft, thread tightening, thread cutting, and pushing up in an embodiment of a chain stitch button sewing machine according to the present invention.

Fig. 2 is the first embodiment of electrical connection in the control of the chain stitch button sewing machine of the present invention.

Fig. 3 is a perspective view of main parts showing a specific structure of the thread tensioning device of the chain stitch button sewing machine according to the first embodiment.

Fig. 4 is an explanatory diagram showing the structures of the thread cutting device and the push-up device of the chain stitch button sewing machine according to the first embodiment.

FIG. 5 is a perspective view of FIG. 4 .

Fig. 6 is an explanatory view showing specific structures of a thread cutting device and a push-up device of a chain stitch button sewing machine according to a second embodiment.

Fig. 7 is an enlarged view of a main part of the thread cutting device in Fig. 6 .

Fig. 8 is an explanatory diagram showing the structures of a thread tensioning device, a thread cutting device, and a push-up device of a conventional chain stitch button sewing machine, and a main part thereof.

Fig. 9 is an enlarged plan view of main parts showing the structure of a thread tightening member of the chain stitch button sewing machine of Fig. 8 .

Fig. 10 is a sequence diagram of drive shaft, thread tightening, thread cutting, and push-up in the implementation form of the existing chain stitch button sewing machine.

Detailed ways

Next, an embodiment of the present invention will be described with reference to FIG. 1 to FIG. 5 .

In the chain stitch button sewing machine of this embodiment, there is a CPU 30 as a control mechanism for controlling the driving mechanism of the thread cutting device for cutting the upper thread after the chain stitch and closing the button after the chain stitch. The driving mechanism of the push-up device that pushes makes them start driving sequentially when the driving of one cycle of the above-mentioned sewing machine mechanism stops or just after it stops, and controls them to act in sequence as shown in Figure 1.

Among the respective structures of the above-mentioned thread tensioning device, thread cutting device, and push-up device, those that are not particularly mentioned are the same as those shown in the prior art except for the driving source, and are assigned the same number to indicate, and omit them. illustrate.

That is, in the chain stitch button sewing machine of the present embodiment, the above-mentioned CPU 30 performs such control that the thread tensioning device, the thread cutting device, and the push-up device are activated when the drive shaft of the chain stitch button sewing machine is started. OFF in the standby state, just before the end of one cycle of driving the above-mentioned driving shaft (a1), only the thread tensioning device (b1) is activated, and in the state where sufficient and appropriate thread tensioning has been performed, the driving of the above-mentioned driving shaft and the tensioning are stopped. Drive of the line device (a2, b2). Afterwards, when the driving of the driving shaft and the driving of the thread tensioning device are stopped, the thread cutting device starts to move (c1), and when the thread cutting by the thread cutting device is completed (c2), the push-up device is moved (d1), and with the push-up The end of the work (d2), the end of a series of chain stitch buttoning process.

Through such control, the actions in the processes of thread tightening, thread cutting, and push-up will not overlap, and proper thread tightening and a certain length of remaining thread can be obtained when buttoning the object to be sewn.

Fig. 2 shows the first embodiment of the control carried out by the chain stitch button sewing machine of the present invention. The two actuators 31 , 32 of the actuator 32 of the push-up device are electrically connected for control.

In this embodiment, as shown in the perspective view of the main part in FIG. 3 , the actuator 31 of the above-mentioned thread tensioning device is arranged on the portion connected to the above-mentioned swing arm 2 in the conventional thread tensioning rotating arm 4 . The driving of the actuator 31 is controlled by the CPU 30, so that, similarly to the above, the above-mentioned thread tightening rotating arm 4 is driven to rotate around the fulcrum 3, and the above-mentioned thread tightening arm 5 is pushed out in the direction of the needle bar not shown, The thread hole 10 of the thread tightening member 7 is rotated in the horizontal direction away from the upper thread passing path, so that the upper thread can be tightened.

In addition, in this embodiment, the actuator 32 used to drive the thread cutting device and the push-up device is the same actuator, as shown in the top view of the main part of FIG. 4 and the perspective view of the main part of FIG. The lower part of the above-mentioned drive arm 25 replaces the connection with the eccentric rotating body 27 .

In the chain stitch button sewing machine of the present embodiment, the CPU 30 first drives the actuator 31 of the thread tensioning device, and when the thread is properly tightened, drives the actuators 32 of the thread cutting device and the push-up device.

Through such control, after the actuator 31 is driven to properly tighten the thread with the thread tension device, the actuator 32 can be driven to pull the driving arm 25 downward to swing the swing arm 2, and the above-mentioned thread cutting rotating arm 11 rotates, and the thread cutting part 16 of above-mentioned thread cutting device is pushed out toward the needle bar lower part, thereby cuts off the upper thread with desired length, and pushes up the push-up part 22 of above-mentioned push-up device upwards. In addition, the driving mechanism of the above-mentioned thread cutting device and the driving mechanism of the push-up device are the same actuator 32 as the driving source. Therefore, the number of parts constituting the chain stitch button sewing machine can be reduced, the size can be reduced, and the cost can be reduced. cost.

In the second embodiment shown in FIG. 6, the thread cutting device is connected to the plunger 32a of the actuator 32, and has a link 35 movable in the horizontal direction as the plunger 32a advances and retreats. This link 35 is a member corresponding to the drive arm in the above-mentioned embodiment. And the other end of the spring member 36 whose end is locked on the sewing machine frame not shown is locked on the end of the connecting rod 35 opposite to the plunger connecting side. Next, the above-mentioned plunger 32a and the connecting rod 35 are usually pulled in the extending direction (B direction in the drawing) until the end of the connecting rod 35 on the side where the spring member is arranged is in contact with the sewing machine (not shown). The stopper 37 on the frame touches.

Furthermore, one end of a link-side engaging rod 38 of the push-up device is connected to an end portion of the link 35 on the opposite side to the plunger connection side. The above-mentioned connecting rod side engaging rod 38 is fixed on the sewing machine frame not shown and can freely rotate through the fulcrum 39, and the other end of the connecting rod side engaging rod 38 is formed with a locking mechanism arranged on the push-up device. The pin portion 40 to which the rod 23 engages. The link side engagement lever 38 and the pin portion 40 correspond to the swing arm side engagement lever 24 in the above-mentioned embodiment.

And, as above-mentioned push-up device, on the take-out part 18 that is formed on the lower surface of one end of push-up base 17, be formed with the fulcrum 19 that rotates, be rotatably supported by this fulcrum 19, and be arranged on above-mentioned. The pressing of the spring member 41 between the push base 17 and the link 35 brings the push-up member 22 into contact with a needle plate 42 provided on a sewing machine table (not shown).

In addition, one end of a substantially L-shaped first rotating arm 43 of the thread cutting device is connected to the middle part of the above-mentioned connecting rod 35, and the first rotating arm 43 can rotate in the vertical direction with its bent part as a rotating fulcrum 44. be supported. The other end of the first pivot arm 43 is formed with a pin portion 45 . On the other hand, a cam groove 48 is formed near the above-mentioned end portion of the second pivot arm 46 which is freely rotatably supported on an unillustrated sewing machine frame with one end as a pivot point 47, and the above-mentioned pin portion is engaged with the cam groove 48. 45. The first turning arm 43 and the second turning arm 46 correspond to the thread cutting turning arm 11 in the above-mentioned embodiment.

Furthermore, one end of an L-shaped link 49 is rotatably connected to the other end of the second pivot arm 46 , and one end of the first thread cutting arm 50 is connected to the other end of the L-shaped link 49 . The other end of the above-mentioned first thread cutting arm 50 is fixed to one end of the second thread cutting arm 51, and the other end of the second thread cutting arm 51 is fixed to the movable cutter as the thread cutting member 16 which is rotatably fixed under the needle plate 42 of the sewing machine. 16a link. That is, the first thread cutting arm 50 and the second thread cutting arm 51 correspond to the thread cutting arm 15 in the above-mentioned embodiment.

In addition, as shown in FIG. 7, a fixed knife 16b for cutting the upper thread by cutting the movable knife 16a when the movable knife 16a rotates is fixed to the above-mentioned needle plate 42 portion.

Like this, when above-mentioned connecting rod 35 retreated to arrow A direction among Fig. 6, above-mentioned first rotating arm 43 and the second rotating arm 46 will be done counterclockwise rotation in the figure, through above-mentioned first thread cutting arm 50, the second thread cutting arm 50 will be cut. The movable cutter 16a of the arm 51 as the above-mentioned thread cutting member pushes out downwards of the needle bar, and cuts with the fixed cutter 16b of the needle plate 42 part to cut off the upper thread on the underside of the sewn object.

Even in the chain stitch button sewing machine of this embodiment, the above-mentioned CPU 30 initially drives the actuator 31 of the above-mentioned thread tensioning device. 32 for driving.

That is, when the sewing machine completes the predetermined sewing and the needle stops, the actuator 32 is energized, and when the plunger 32a moves in the direction A shown in the figure, the connecting rod 35, the first rotating arm 43, and the second rotating arm 46 , the first thread cutting arm 50 and the second thread cutting arm 51 are moved in the direction of C in the drawing, and the movable cutter 16a is rotated in the direction of Q to cut with the fixed cutter 16b, thereby cutting the upper thread.

During this period, although the link-side engagement lever 38 connected to the link 35 rotates in the direction D shown in the figure, the link-side engagement lever 38 rotates between the pre-formed gap E until the above-mentioned thread cutting operation is completed, so that the link side engages. The pin portion 40 of the closing lever 38 does not engage with the engaging lever 23 of the push-up device, but the above-mentioned pin portion 40 engages with the engaging rod 23 when the thread trimming is completed, and the push-up member 22 is pushed up by the rotation of the push-up device. Rotate in the direction D shown in the figure to release the sewing product not shown in the figure.

In addition, during this period, although the first rotating arm 43 continues to rotate in the direction F shown in the figure, the second rotating arm 46 does not rotate due to the cam groove 48 formed on the second rotating arm 46 .

In the control carried out in this specific embodiment, the drive mechanism of the above-mentioned thread cutting device and the drive mechanism of the push-up device also use the same actuator 32 as the drive source. Miniaturization by reducing the number of parts and reducing costs.

Claims (1)

1. chain-type stitch button-sewing machine, by chain-type stitch nail catcher on sewn object, have the stringing device of the reaching the standard grade tension after will making, the thread cutting device that cuts off and of will reaching the standard grade, it is characterized in that described button sewing machine comprises the pushing-up device that pushes away on the button:

Actuator as drive source;

The actuating arm (25,35) that moves by above-mentioned actuator;

According to the action of above-mentioned actuating arm, after chain-type stitch with the actuating mechanism of the pushing-up device that pushes away on the button;

According to the action of above-mentioned actuating arm, carry out the actuating mechanism of the thread cutting device of above-mentioned tangent line by cursor;

The above-mentioned single actuator as drive source drives the actuating mechanism of above-mentioned thread cutting device and the actuating mechanism of above-mentioned pushing-up device; And

When the driving of above-mentioned Sewing machines mechanism stops or the controlling organization that has promptly driven after just having stopped.

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