JPH0331261Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention applies a tensile force that resists the sewing tension to the object to be sewn in a single automatic sewing machine to perform suitable sewing. The present invention relates to a tensioning device for applying tension to an object to be sewn.

(Prior art) For example, seat pads and seat covers used for upholstering automobile seats are produced by polymerizing and pulling out a roll-wound pad material and a roll-wound cover material, and then sewing them continuously. By using the sewing machine, it is possible to sew with high productivity.

In addition, for a series of sheet-like objects that are pulled out from the pad material and the cover material and sewn,
Although it is necessary to apply a tensile reaction force that resists the sewing tensile force of the sewing machine, a tension applying device for applying this tensile reaction force is, for example, a tension roller mechanism of a simple structure (for example, a dancer roller). By adopting this, the tensile reaction force can be arbitrarily adjusted and suitable sewing can be performed.

However, the seat pad and seat cover are
Since there are few straight parts, the outer shape is relatively varied, and the sizes are different, the method of polymerizing and pulling out the original fabric and sewing it continuously as described above is not possible. In terms of material removal, there is a significant amount of cutting loss, which greatly reduces economic efficiency. For this reason, this type of sewing is performed by so-called piece sewing, in which each item is sewn individually.

By sewing the seat pad and seat cover in pieces, the cutting loss of the material is reduced and the economy in terms of material removal is greatly improved. Also,
In piece sewing, the pieces are sewn one by one manually by the worker, so the tensile reaction force can be adjusted as desired by adjusting the pressing force applied to the object to be sewn by the worker's fingertips.

However, manual sewing is naturally inferior in productivity, which reduces economic efficiency.
Moreover, it reduces the variation in quality. Therefore, it is not possible to obtain a highly reliable sewn product with excellent economy and high quality.

Therefore, it is conceivable to perform piece sewing through automation, but in this case, a simple structure such as the above-mentioned tension roller mechanism should be adopted as a tension applying device for applying a tensile reaction force. However, the problem is that the device becomes large-scale and complicated.

The present invention was developed in view of these circumstances, and it provides a simple structure that applies a tensile reaction force that resists the sewing tensile force to objects to be piece-sewn automatically, thereby providing suitable sewing. It is an object of the present invention to provide a tension applying device for a workpiece that can perform sewing.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a clamp mechanism for gripping the sewing end portion of the sewing material carried on the feeding surface of the machine body in an openable and closable manner, A reciprocating mechanism is provided at the end of the machine body to move the clamp mechanism forward and backward in a feeding direction toward a sewing machine disposed adjacent to the sewing machine and a return direction away from the sewing machine. Incorporating a braking mechanism that applies the frictional force between the movement guide horizontal shaft and the connecting member through which the horizontal shaft is inserted to the object to be sewn as a tensile reaction force against the sewing tensile force of the sewing machine. It is.

(Function) In the present invention, the workpiece, which has been moved forward in the feeding direction by the reciprocating mechanism while the sewing end portion is gripped by the clamp mechanism, has just entered the sewing machine. While sewing is being performed from the sewing start end to the sewing end, the braking mechanism incorporated in the reciprocating mechanism operates, and the horizontal shaft for guiding the movement of the clamp mechanism and the connecting member through which this horizontal shaft is inserted are operated. The frictional force generated between the sewing machine and the sewing machine is applied to the object to be sewn via the clamp mechanism as a tensile reaction force that resists the tensile force of the sewing machine.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, in which a tension applying device 1 for a workpiece is
A clamp mechanism 10, a reciprocating mechanism 20 that moves the clamp mechanism 10 forward and backward in a feed direction toward a sewing machine (direction of arrow X ₁ ) and a return direction away from the sewing machine (direction of arrow _X ), which will be described later. A braking mechanism 30 built into the moving mechanism is provided.

The clamp mechanism 10 grips the sewing end portion 3A of the workpiece 3 carried onto the feeding surface 2A of the machine body 2 shown in FIG. 2, and places the workpiece 3 adjacent to the end of the machine body 2. This is for feeding into sewing machine 4.
As shown in FIG. 1, a pair is provided facing each other on the left and right with an appropriate width interval. It protrudes upward as shown in FIGS. 2 and 5 from a pair of left and right guide notches (not shown) formed in the feeding direction of the feeding surface 2A in FIG. Further, as shown in FIG. 3 (however, since the left and right pair of clamp mechanisms 10, 10 have the same structure, only one clamp mechanism 10 is shown), clamp claws 1 facing vertically
1, 11, and an opening/closing cylinder 12 that opens and closes these clamp claws 11, 11. The clamp claws 11, 11 and the opening/closing cylinder 12 are each attached to a vertical mounting plate 13, and this mounting plate 13 has a horizontal width. It is supported upright on the upper surface of an upper support plate 14 extending in the direction.

On the lower side of the upper support plate 14, as shown in FIG. At the same time, an air cylinder 16 is mounted upward in the center of the lower surface of the air cylinder 16, and a piston rod 16a (see FIG. 3) of the air cylinder 16 passes through the lower support plate 15 so as to be able to rise and lower, and extends from the lower surface of the upper support plate 14. is connected to.

The reciprocating mechanism 20 includes a motor 21 and a pair of front and rear rotating shafts 2 extending in the horizontal width direction and parallel to each other.
2, 22, driven chains 23, 23 that span these rotating shafts 22, 22, motor 21 and drive shaft 24
It is composed of a drive chain 25 that spans over the front rotating shaft 22 and a transmission chain 26 that spans over the front rotating shaft 22 and the drive shaft 24. Connecting members 5, 5 are attached to both left and right ends of the lower support plate 15, and these connecting members 5, 5 are attached to the driven chain 2.
A horizontal axis 27 provided parallel to the outside of 3, 23,
27 is inserted with a predetermined frictional force, and the driven chains 23, 23 are connected to the lower support plate 15.

Therefore, by rotating the motor 21 of the reciprocating mechanism 20 in forward and reverse directions, the clamp mechanism 10 reciprocates using the horizontal shafts 27, 27 as guides, and the amount of this reciprocating movement is determined by the first detection using, for example, a limit switch. 6 and a second detector 7.

In addition, in this embodiment, the left clamp mechanism 10
A third detector 8 made of a photo sensor is attached to the inside of the lower clamp claw 11 facing upward.

The control mechanism 30 controls the sewing machine 4 to control the sewing material 3.
When sewing, the reciprocating mechanism is used to apply a tensile reaction force, that is, tension, against the sewing tension applied to the object 3 to perform suitable sewing. 20, the rotation of the drive shaft 24 is controlled by the front rotation shaft 2.
It is constituted by an electromagnetic clutch that can be connected and disconnected to and from 2.

Incidentally, since the sewing machine 4 is constituted by a well-known sewing machine, a description thereof will be omitted.

Next, the operation of the above configuration will be explained.

The article to be sewn 3 is carried to a predetermined position P on the feeding surface 2A of the machine body 2 shown in FIG. 2 by a carrying device (not shown). The object to be sewn 3 is, for example, one used for the upholstery of automobile seats, as shown in FIG. The seat cover 3b as a skin material is polymerized to form a set of objects 3 to be sewn.

In the state shown in FIG. 2, the clamp mechanism 10 shown in FIG. 1 has started moving forward by the operation of the reciprocating mechanism 20. That is, the motor 21 rotates forward. With this, the rotating shafts 22, 22 are aligned with the arrow X ₁
direction, and the driven chains 23, 23 are rotated in the same direction. Therefore, the lower support plate 15 of the clamping mechanism 10 is guided by the horizontal shafts 27, 27 as shown in the arrows.
X Move forward in _one direction.

At the same time, the air cylinder 16 of the clamp mechanism 10 is activated, and the piston rod shown in FIG.
1 is raised, and the opening/closing cylinder 12 is operated to open the clamp claws 11, 11. As a result, the clamp mechanism 10, as shown in FIG.
The upper clamp claw 11 protrudes above the feed surface 2A of the machine body 2, and the machine moves forward with both clamp claws 11, 11 open.

As the clamp mechanism 10 moves forward, the lower clamp claw 11 of one clamp mechanism 10
When the third detector 8 attached to the inside of the sewn object 3 reaches the sewing end portion 3A of the object to be sewn 3, the object to be sewn 3 is detected, the motor 21 is stopped, and the forward movement of the clamp mechanism 10 is stopped. At the same time, the opening/closing cylinder 12 is returned to its original position, and the sewing end portion 3A of the object 3 is sewn by the clamp claws 11, 11 as shown in FIG.
grasp.

Next, the motor 21 is rotated forward again, and the clamp mechanism 10 and the workpiece 3 are rotated in the feeding direction (arrow
X ₁ direction), and move it forward in the sewing starting end 3
B is stopped at the entrance of the sewing machine 4 (see FIG. 2), that is, at the needle position (not shown) of the sewing machine 4.

When the sewing starting end 3B stops at the needle position of the sewing machine 4, the sewing material 3 is sewn by a comb-shaped pressing member (not shown) provided near the entrance of the sewing machine 4. While gently pressing the edge portion including the starting end 3B from above, the sewing machine 4 operates to sewn the sewing material 3.
Sewing is performed while moving in the feeding direction.

At the same time as the sewing operation starts, the electromagnetic clutch constituting the braking mechanism 30 shown in FIG. 1 is released, and the reciprocating mechanism 20 is disconnected from the motor 21. Therefore, the clamp mechanism 10 is
With the clamp claws 11, 11 clamping the sewing end portion 3A of the sewing object 3, the sewing machine 4 moves the sewing object 3 while being sewn in the feeding direction. It turns out. for that,
The frictional force generated between the connecting members 5, 5 attached to both sides of the lower support plate 15 and the horizontal shafts 27, 27 is applied as a tensile reaction force in the feeding direction,
A suitable tension is applied to the object to be sewn 3, that is, a tension equivalent to applying a load by gently pressing the object to be sewn with the worker's fingertips during manual sewing by the worker. sewing.

Just before the sewing end portion 3A of the object to be sewn 3 reaches the entrance of the sewing machine 4, the opening/closing cylinder 12 is operated to open the clamp claws 11, 11, and the object to be sewn 3 is released from the clamp mechanism 10. The operation of the opening/closing cylinder 12 for opening the sewing object 3 is based on the sewing time determined based on the relationship between the length of the sewing object 3 in the sewing direction and the feed speed of the sewing machine 4. done by control.

Clamp claws 11, 11 of the clamp mechanism 10
Immediately after opening, the lower support plate 15 comes into contact with the second detector 7, causing the motor 21 of the reciprocating mechanism 20 to rotate in the opposite direction, and at the same time, the electromagnetic clutch constituting the braking mechanism 30 is engaged and clamped. The mechanism 10 is moved backward, and when this backward movement is started, the air cylinder 16
is activated, the piston rod 16a is lowered, and the clamp claws 11, 11 of the clamp mechanism 10 are attached to the fuselage 2.
lower than the feed surface 2A.

With the clamp claws 11, 11 lowered below the feed surface 2A of the machine body 2, before the clamp mechanism 10 starts retreating, it is moved to a predetermined position P on the feed surface 2A of the machine body 2 shown in FIG. , the next article to be sewn 3 is being carried in. Therefore, the clamp claws 11, 11 of the clamp mechanism 10 move backward through the underside of the second article to be sewn 3, and the sewing end portion 3A of the article to be sewn 3 is It is detected by the third detector 8 installed inside the lower clamp claw 11 of one clamp mechanism 10, and the motor 21 of the reciprocating mechanism 20 is activated slightly upstream from this position in the feed direction _X1 . Stop and stop the clamp mechanism 10.

Next, the air cylinder 16 of the clamp mechanism 10
is activated, the piston rod 16a is raised, and the clamp claws 11, 11 are raised together with the upper support plate 14, and the opening/closing cylinder is activated to open the clamp claws 11, 11. In this state, the motor of the reciprocating mechanism 20 is activated. 21 in the forward direction and clamp mechanism 1
0, and the second
After gripping the third object to be sewn 3, the above-described operations are repeated to sequentially sew the third object to be sewn and the last object to be sewn.

The clamp mechanism 1 starts to retreat just before the sewing terminal end of the last sewing object carried into the predetermined position P on the feeding surface 2A of the machine body 1 reaches the entrance of the sewing device 4.
0, when the lower support plate 15 comes into contact with the first detector 6 and stops the motor 21 of the reciprocating mechanism 20, it returns to the origin and stops, waiting for the next operation. be.

In the above embodiment, the braking mechanism 30 is constructed by an electromagnetic clutch that is incorporated into the drive shaft 24 of the reciprocating mechanism 20 and can intermittent the rotation of the drive shaft 24 with respect to the front rotation shaft 22. However, the present invention is not limited to the above-mentioned embodiments, and may employ various braking mechanisms capable of braking using an electromagnetic brake or the like by adjusting torque.

(Effects of the invention) As described above, according to the invention, the sewing end portion of the workpiece carried on the feeding surface of the machine body is gripped by a clamp mechanism that can be opened and closed, and this clamp mechanism is moved by a reciprocating mechanism. The machine is moved forward in the feeding direction toward a sewing machine placed adjacent to the end of the machine body to perform sewing.
Before the sewing is completed, the clamp mechanism is operated to move backward in the return direction away from the sewing machine, and the objects to be sewn are sequentially sewn, so piece sewing can be performed automatically. In addition, the reciprocating mechanism allows the sewing machine to reduce the frictional force between the movement guiding horizontal shaft of the clamp mechanism and the connecting member through which this horizontal shaft is inserted, against the workpiece during sewing. Since the structure incorporates a braking mechanism that is applied as a tensile reaction force against the tensile force, the tension is suitable for sewing objects to be sewn. The quality of sewing can be improved by applying tension equivalent to applying a load by gently pressing the object to be sewn with the fingertips of the operator.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a schematic side view showing the positional relationship between the machine body and the sewing machine, Figure 3 is a side view of the clamp mechanism, Figure 4 is a vertical side view showing an example of the object to be sewn, and Figure 5 shows that the clamp claw is attached to the machine body. FIG. 6 is a side view showing a state in which the clamp claw protrudes above the feeding surface and is opened; FIG. 1... Tension applying device, 2... Aircraft, 2A
...Feeding surface, 3...Sewing object, 3A...Sewing end portion, 4...Sewing machine, 5...Connecting member, 10...Clamp mechanism, 20...Reciprocating mechanism, 27...Horizontal Axis, 30... Braking mechanism, X ₁ ... Feeding direction, X ₂
...Return direction.

Claims (1)

[Scope of utility model registration request] A clamp mechanism that opens and closes the sewing end portion of the workpiece carried onto the feeding surface of the machine body, a connecting member attached to the clamp mechanism, and a connecting member that is inserted through the connecting member with frictional force. a horizontal shaft that guides movement of the clamp mechanism; and a reciprocating mechanism that moves the clamp mechanism forward and backward in a feeding direction toward a sewing machine disposed adjacent to the terminal end of the machine body and a return direction away from the sewing machine; A braking mechanism is incorporated in the reciprocating mechanism and applies the frictional force between the connecting member and the horizontal shaft to the workpiece as a tensile reaction force against the sewing tension of the sewing machine. A device for applying tension to an object to be sewn, characterized by: