JPH07171281A - Polygonal sewing method for cushion surface fabric - Google Patents

Abstract

PURPOSE:To achieve a saving of labor and a speeding up by a method wherein a conditioning is performed between a sewing machine and fabric to be sewn in straight sewing between a forward tensioner and a backward tensioner during the sewing while the fabric to be sewn is moved being turned by a specified angle with a turning arm device at the final end of straight sewing to prepare for the subsequent straight sewing. CONSTITUTION:Two sheets of fabric are piled up and placed on a working base 3 to set. A beam member 9 of a forward tensioner 5 is positioned near an arm member 33 of a turning arm device 7. Then, the fabric is pressed with pressing bars 11 and 11 and a weight is hung to stretch the fabric in the direction of forward sewing. The rear end of the fabric is pressed with a fabric pressing device 25 of a backward tensioner 6 moving on a rail 24 to be strected backward f2 with the weight 30. Then, a straight sewing is performed in the direction f1 of the forward sewing with the forward and backward tensioners 5 and 6 conditioned. After the end of the straight sewing, the pressing bars 26 and 11 rise to press the arm member 33 of the turning arm device 7. Thus. the arm member 33 is turned by a specified angle with a cylinder device 38 to turn the fabric four times about a sewing needle 4 thereby making a setting for the subsequent straight sewing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polygonal sewing method which enables quick and labor-saving sewing of a seating cloth for a zakka.

[0002]

2. Description of the Related Art Conventionally, when sewing a table cloth of a zakkadan, two sheets of cutting cloth w ... Are prepared as shown in FIG. Sewing is done.

This sewing is performed by, for example, manually adjusting the condition of the cloth to be sewn w and the sewing machine and performing linear sewing from the sewing start position p1 so that the sewing needle ends at the first linear portion s1. When p2 is reached, the cloth to be sewn w is manually rotated 90 degrees around the sewing machine needle, and the second straight line portion s
Since the second straight line sewing is carried out, the turning operation and the straight line sewing are repeated thereafter, and the third straight line portion s3 and the fourth straight line portion s4 are repeated.
Also, the straight line sewing of the fifth straight line portion s5 is performed, and when the sewing machine needle reaches the sewing end position p3, the straight line sewing of the fifth straight line portion s5 is finished.

[0004]

The sewing of the seating cloth for the seat is a relatively simple process of sewing the cloth to be sewn into a polygonal shape, but it has been carried out manually until now. Therefore, it takes a lot of time and effort.

An object of the present invention is to enable such polygonal sewing to be performed labor-savingly and quickly.

[0006]

In order to achieve the above object, in the polygonal sewing of the present invention, a front tensioning device for pulling the cloth to be sewn in the forward sewing direction of the sewing machine needle on the work surface of the sewing machine, and the same tensioning device. A rear tensioning device for pulling the sewing cloth in the backward sewing direction of the sewing machine needle and a swing arm device for swinging and moving the sewing cloth around the sewing machine needle by a required angle are provided and are located below the sewing machine needle. Straight sewing was performed while pulling the front part of the sewing needle of the cloth to be sewn to the front tension device and the back part of the sewing needle of the same cloth to the rear tension device, and the sewing needle reached the end of the straight stitch. At this time, the cloth to be sewn is swung by the swivel arm device around the sewing machine needle by a required angle.

[0007]

[Function] In straight stitching, the front tensioning device and the rear tensioning device adjust the condition of the sewing machine device being sewn and the cloth to be sewn.
At the end of the straight stitch, the swing arm device swings the cloth to be sewn by a required angle to prepare for the next straight stitch.
Therefore, if the cloth to be sewn is set at a predetermined position on the surface of the work table of the sewing machine, the polygonal sewing can be performed mechanically with no or almost no manpower.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a sewing machine device for carrying out the present invention. It is a fixed sewing machine workbench.

On the surface of the sewing machine work table 3, therefore, a front pulling device 5 for pulling the cloth to be sewn w in the forward sewing direction f1 of the sewing machine needle 4, and the cloth to be sewn w are moved backward from the sewing machine needle 4. A rear pulling device 6 for pulling in the sewing direction f2 and a swing arm device 7 for swinging and moving the cloth to be sewn w around the sewing machine needle 4 by a required angle are provided.

Here, the front tension device 5 is, for example, as follows. That is, the guide rails 8a and 8b are fixed to both sides in the width direction of the half of the workbench 3 on the forward sewing direction f1 side, and the beam members 9 that are laid across the guide rails 8a and 8b.
Is guided so as to be movable only along the forward sewing direction f1. The beam member 9 is provided with at least two cloth pressing devices 10a and 10b which are vertically fixed at arbitrary positions in the longitudinal direction thereof. The cloth pressing devices 10a and 10b are provided with a pressing rod 11 and a cylinder device 12 for vertically moving the pressing rod 11. A standing member 13 is fixed to the central portion of the beam member 9 in the longitudinal direction, and a guide wheel 15 that is rotatable around a horizontal shaft 14 is provided at the central position of the front and rear ends of the work table 3 facing the member 13. Set up. One end of the guide wheel 15 is attached to the upright member 13 by a tension thread 1
6 is guided, and a weight 17 is fixed to the tip of the thread 16. On the other hand, a supporting plate member 18 is provided on the head of the sewing machine 2 so as to project toward the center of the work table 3.
Two guide wheels 19a and 19b are provided on the side surface of 8, and a guide wheel 19c is also provided at the tip of the overhanging member 18a extended from the tip of the same member 18 in the forward sewing direction f1. On the other hand,
A support piece 20 is fixed to one side of the workbench 3, and an arm member 21 is pivotally attached to the support piece 20.
In connection with the expansion / contraction operation of the cylinder device 22 provided in relation to No. 1, it is possible to freely swing and displace along the vertical surface. Arm member 21
At the tip of the pulling thread 23, one end of which is fixed to the upright member 12
The other end of the pulling thread 23 is fixed and the middle of the pulling thread 23 is guided by the guide wheels 9a, 9b, 9c. Then, the beam member 9 is moved to the vicinity of the sewing machine needle 4 on the work table 3 by the compulsory swing displacement of the arm member 21 in the arrow direction f3 by the cylinder device 22, and when the cylinder device 22 is operated, the beam member 9 is actuated. 9 is pulled in the forward sewing direction f1 by the pulling force of the weight 17.

The rear pulling device 6 is, for example, as follows. That is, the guide rail 24 along the same direction f2 is provided on one side of the half of the work table 3 on the backward sewing direction f2 side. The rail 24 is provided with a cloth pressing device 25 that is movably guided along the backward sewing direction f2. The cloth pressing device 25 includes a pressing rod 26 and a cylinder device 27 for vertically moving the pressing rod 26, and does not interfere with the arm member 33, which will be described later, in a swinging state. A guide wheel 28, which is rotated around the horizontal axis, is provided at the end of the workbench 3 at a position facing the cloth pressing device 25, and one end of the guide wheel 28 is provided with a pulling thread 29 fixed to the cloth pressing device 25. Let me guide you. A weight 30 is attached to the other end of the tension yarn 29.
The cloth pressing device 25 is always pulled by the gravity of the weight 30. Further, a stopper 31 for restricting movement of the cloth pressing device 25 is fixed midway in the longitudinal direction of the rail 24 so as to be positionally adjustable.

Further, the revolving arm device 7 is, for example, as follows. That is, the vertical axis member 32, which is rotatable around the sewing machine needle 4, is provided on the head of the sewing machine 2, and the base end of the arm member 33 extended onto the workbench 3 is fixed to the lower end of the vertical axis member 32. The arm member 33 is provided with a cloth pressing device 34 which is vertically fixed at an arbitrary position in the longitudinal direction. The cloth pressing device 34 includes a pressing rod 35 and a cylinder device 36 for moving the pressing rod 35 up and down. I will say what you did. On the other hand, the projecting member 18 is formed integrally with the support plate member 18.
b is provided, the shaft driving arm member 37 is laterally fixed to the upper end of the vertical axis member 32, and a cylinder device 38 that is extended and retracted is provided between the tip of the arm member 37 and the tip of the protruding member 18b. And this cylinder device 3
It is assumed that the arm member 33 is swiveled around the sewing machine needle 4 by a required angle by an appropriate expansion and contraction operation of 8.

When the above-mentioned sewing machine is used to perform the square stitching of the front cloth of the seat cushion, for example, it is carried out as follows.

That is, after the two surface materials w ... Are put in a state of being overlapped with each other as shown in FIG.
The sewing machine is placed on the sewing machine, and the sewing start position p1 is located immediately below the sewing machine needle 4 as shown in FIG. At this time, the beam member 9 of the front pulling device 5 is positioned near the arm member 33 of the turning arm device 7 by the operation of the cylinder device 22,
In relation to this, the cylinder devices 12, 12 are extended, the two pressing rods 11, 11 hold the cloth w to be sewn, and the weight 17 pulls the cloth w to be sewn in the forward sewing direction f1. Become. Further, the cloth pressing device 25 of the rear tensioning device 6 is manually moved to the front end portion of the rail 24, and in connection with this, the cylinder device 27 is extended and the pressing rod 26 holds the cloth to be sewn. The pressing and weight 30 is in a state of pulling the cloth to be sewn w ... In the backward sewing direction f2.

When the sewing machine 2 is sewn in the forward sewing direction f1 in this state, the cloth to be sewn w ... Is tuned by the front tensioning device 5 and the rear tensioning device 6 and the first straight line portion shown in FIG. The forward sewing of s1 is carried out. Then, when the sewing machine needle 4 reaches the end of the straight line portion s1, FIG.
As shown in FIG. 5, the presser bar 26 of the cloth pressing device 25 is automatically displaced upward by the cylinder device 27, so that the cloth pressing device 25 is moved from the position of k1 in the backward sewing direction f2 by the gravity of the weight 30. Therefore, it is locked at the position of the stopper 31 which is set in advance, and the pressing rods 11, 11 of the cloth pressing devices 10a, 10b are automatically lifted and displaced by the cylinder devices 12, 12, so that The member 9 is also moved in the forward sewing direction f1 by the gravity of the weight 15 from the position of k2, and is in a state of being locked at the front end of the work table 3.

After these operations, the cylinder device 36 of the cloth pressing device 34 automatically lowers the pressing rod 36 and, in association with this, the other cylinder device 38 extends and operates, whereby FIG. As shown in (c), the arm member 33 of the swivel arm device 7 swivels from the position of k3 as shown by the arrow f4, and the cloth to be sewn ... Pressed by the presser bar 36 is rotated 90 degrees about the sewing machine needle 4. In order to move the cloth, the cylinder device 27 of the cloth pressing device 25 is actuated, and the pressing rod 26 moves the cloth to be sewn.
・ The button is pressed. Subsequently, the cylinder device 36 is operated and the pressing rod 35 is displaced upward, and then the cylinder device 38 is shortened and the arm member 33 is returned to the position k3 again. On the other hand, the cylinder device 22 is extended to swing the arm member 21 in the arrow direction f3, whereby the beam member 9 is moved to the position k4 shown in FIG. 4C.

After this, the sewing machine 2 automatically moves to the second straight line portion s.
Start the sewing operation of 2. In this case, as shown in FIG. 4 (d), the rear tensioning device 6 pulls the rear end of the cloth to be sewn w in the backward sewing direction f2, and the front tensioning device 5 uses the forward stitching of an appropriate size. Has been carried out and the cloth to be sewn w
When the front portion of * is positioned directly below the beam member 9, the cylinder devices 12, 12 of the cloth pressing devices 10a, 10b are activated, and as shown in FIG.
.. is pressed and pulled by the gravity of the weight 17 in the forward sewing direction f1.

When the sewing machine needle 4 reaches near the end of the second straight portion s2, the cylinder device 2 of the rear tensioning device 6
7 is operated and the presser bar 26 is displaced upward, so that the cloth pressing device 25 is pulled from the position of k1 by the gravity of the weight 30 to move in the backward sewing direction f2 and is locked by the stopper 31. When the sewing machine needle 4 completely reaches the end of the straight line portion s2, the cylinder device 1 of the front tension device 5
2, 12 are actuated, the presser rods 11, 11 are displaced upward, the cloth to be sewn w is released from the tension of the presser rods 11, 11, the cylinder device 22 is extended, and the beam member 9
Is moved to the position k5 of the chain double-dashed line in FIG.

Thereafter, the cloth to be sewn w is automatically swiveled and linearly sewn in the same manner as described above, and the third straight line portion s3, the fourth straight line portion s4 and the fifth straight line portion s5 are sewn. Will be sewn in sequence.

Thus, when the sewing machine needle 4 reaches the final sewing position p3 of the fifth straight line portion s5, the respective parts are brought into the state shown in FIG. 4 (f). The cloth w ... Is removed from the workbench 3, and the next cloth to be sewn is set again in the state of FIG.
The same process is repeated thereafter.

In the above-mentioned embodiment, the case of the square sewing is shown, but it is obvious that the same can be carried out with the triangular sewing and the pentagonal sewing. However, in these cases, the turning angle of the arm member 33 needs to be an angle corresponding to these.

The present invention can be applied not only to the sewing of the seat cushion, but also to the sewing of collars, cows, darts, pin tacks, and the like.

[0022]

According to the present invention described above, the polygonal sewing can be performed mechanically simply by setting the cloth to be sewn on the sewing machine. Therefore, the front cloth of the seat cushion and the like can be labor-saving and prompt. It can be sewn.

[Brief description of drawings]

FIG. 1 is a diagram showing a sewing machine device used for carrying out the present invention.

FIG. 2 is a view of the sewing machine seen from different directions.

FIG. 3 is a view of the sewing machine seen from a different direction.

FIG. 4 is an explanatory view showing an operation sequence when performing polygonal sewing with the sewing machine.

FIG. 5 is a diagram showing a sewing mode of the front cloth of the seat cushion.

[Explanation of symbols]

 f1 Forward sewing direction f2 Reverse sewing direction w Cloth to be sewn 3 Sewing machine work table 4 Sewing machine needle 5 Front tensioning device 6 Rear tensioning device 7 Revolving arm device

Claims (1)

[Claims] 1. A front tension device for pulling a cloth to be sewn in a forward sewing direction of a sewing machine needle on a work surface of a sewing machine, and a rear tension device for pulling the cloth to be sewn in a backward sewing direction of a sewing machine needle. , A swivel arm device for swiveling the sewing cloth around the sewing machine needle by a required angle, and the front portion of the sewing machine needle of the sewing cloth positioned below the sewing machine needle to the front tensioning device, and Perform straight line sewing while pulling the back part of the sewing machine needle to the rear tensioning device, and when the sewing machine needle reaches the end of the straight line sewing, turn the sewing machine device around the sewing machine needle by the required angle. A method of sewing polygons such as a table cloth for a zakka, which is carried out by turning.