JPH0151588B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting device for sheet-like sewn products such as quilting stitches.

Layer-stitched sheet-like products, such as the skin of vehicle seats, require a material made by layering an outer fabric such as leather, a sheet of elastic material such as urethane, and a lining fabric and sewing them into multiple strips in the longitudinal direction using a multi-axis sewing machine. It is formed by cutting the width.

However, when this layered material is cut, the seams fray at the cut edges and the sewn fabric peels off, making it unusable. Conventionally, the material was cut by leaving an extra fraying margin on both sides of the required cutting width, but the fraying was prevented. Leaving an extra margin required more material, resulting in wasted material and was economically disadvantageous.

Therefore, the present invention has been made in view of these points. For example, in the material of the skin of a vehicle seat, both the front and back fabrics and the sewing thread are made of resin or resin fiber, and the elastic material interposed between them is made of urethane resin. Since it is molded, the cutting blade is designed to be heated so that it can be thermally melted, and when cutting the material, the cutting edge is melted in the heated state of the cutting blade, and the end of the sewing thread is cut into the front and back fabrics or elastic material. To provide a cutting device which cuts an overlap-stitched material with a cutting blade heated to weld the material to the material and prevent fraying.

That is, in the present invention, a cutting blade is attached to a support body so as to be slidable in the longitudinal direction, electrode terminals are fixed to both ends of the cutting blade, and a voltage is applied between the electrode terminals to heat the cutting blade. At the same time, pusher blades are arranged to press down the front and back of the cut portion of the material by the cutting blade, so that the material is kept under tension between the pusher blades during cutting.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a cutting blade, and a blade portion 1a is formed in an inclined shape. Reference numeral 2 denotes a support body for the cutting blade 1, which is made by laminating a heat-resistant resin material 4 such as Teflon, a heat-resistant electrical insulating plate 5 such as mica, and a metal plate 6 on the lower surface of a hollow beam 3 formed of a steel plate. Mounting body 7
A presser body is formed by laminating a heat-resistant electrical insulating material such as mica on multiple parts of the lower surface of the mounting body 7, and has a gap a approximately equal to the thickness of the cutting blade 1 in the lateral direction of the central part. 8 is attached. The mounting body 7 is provided with gaps b and b' on both sides, and a guide body 10 is attached to both sides of the upper edge of the cutting blade 1 by brackets 9 and 9' within the gaps b and b'. , 10' are laterally slidably positioned. Guide grooves 10a, 10a' are formed on the front and rear surfaces of the guide bodies 10, 10'.
0a, 10a', the hollow beam 3 is inserted with the peak part of the cutting blade 1 being inserted into the gap a of the presser body 8, and the guide bodies 10, 10' being positioned within the gaps b, b' of the mounting body 7. The cutting blade 1 is attached to the support body 2 so as to be slidable in the lateral direction by engaging the inner end edges 11a, 11a' of the engaging bodies 11, 11' fixed to the front and rear surfaces of the cutting blade 1.

A wire 14 is connected between one end of the cutting blade 1 and a pin 13' protruding from one bracket 12' of the support 2, and a wire 14 is connected between the other end and a pin 13 protruding from the other bracket 12. By tensioning the springs 15, the cutting blade 1 is attached to the support 2 in a horizontally pulled state, and electrode terminals 16, 16' are fixed to both ends of the cutting blade 1. The electrode terminals 16, 16' have an inverted T-shape, and one end surface of the horizontal portions 16a, 16a' is in contact with the front surface of the cutting blade 1, and is fixed by tightening screws 17, 17' from the rear side, and the vertical portion 16b , 16b' are attached to the mounting body 7 of the support body 2 via dovetail members 18, 18' so as to be able to slide laterally, and the horizontal part 16
Connect the lead wires to the other ends of a and 16a'.

The support body 2 is moved up and down by cylinders 20, 20' mounted between the brackets 12, 12' on both sides and the upper frame 19.

Reference numeral 21 denotes a presser frame body disposed below the cutting blade 1, and a wide rectangular window hole 22 through which the cutting blade 1 passes is provided on the bottom. Push blades 23, 23' are integrally formed toward the front. The presser frame body 21 is moved up and down by a pair of cylinders 25a, 25b, 25a', and 25b' mounted between the lower surfaces of both sides and the lower frame 24, respectively.

26 is located below the presser frame 21 and
A lower mold installed above has a blade groove 26a, which is a lower blade, facing the cutting blade 1 in the central lateral direction, and a presser frame 21 is inserted in the front and back by sandwiching this blade groove 26a.
Relief grooves 26b, 2 facing the push blades 23, 23'
6b' is formed.

Next, the operation of the cutting device of this example configured as described above will be explained.

First, the outer fabric 31, such as leather, is sewn using a multi-axis sewing machine.
An elastic intermediate material 31c such as urethane is sandwiched between a and a back fabric 31b made of resin fiber, and a sewing thread 3 made of resin fiber is inserted.
1d, the material 31 that has been overlappingly sewn is inserted between the presser frame 21 and the lower die 26 and passed by a predetermined width, and then the presser frame 21 is moved to the cylinders 25a, 25b,
When moved downward by 25a' and 25b', the pusher blade 2
3 and 23' pass the material 31 into the relief groove 26b of the lower die 26,
26b', and in this state, move the support 2 downward using the cylinders 20, 20' to press the cutting blade 1 onto the material 31, and further move the support 2 downward, thereby cutting the cutting blade 1. Material 31 into lower mold 2
The cutting is performed using the blade groove 26a of No. 6.

In this case, the cutting blade 1 has electrode terminals 16, 16'.
By applying a voltage through the material and heating it to approximately 500°C, the cut end surface of the material 31 is heated and melted by the cutting blade 1, and the sewing thread 31d is separated from the front and back fabrics 31a and 31b.
Alternatively, it is welded to the intermediate material 31c to prevent fraying.

In addition, in this cutting, since the cutting blade 1 is formed so that the blade portion 1a is inclined to one side, the material 31 is cut in an oblique direction, and the front and rear parts of the cut portion of the material 31 are aligned with the presser frame 21. Push blade 23, 23'
When the cutting blade 1 cuts into the material 3, the material 3 is pressed down and the pressure blades 23 and 23' are under tension.
The cut portion 1 is lifted up along the cutting blade 1 as shown by the two-dot chain line in FIG. 6, and the cut end surface is separated from the cutting blade 1 and is not melted more than necessary.

Furthermore, when the cutting blade 1 is heated, it thermally expands and extends in the longitudinal direction, but the cutting blade 1 is pressed from the front and back by the presser body 8 against the mounting body 7 of the support body 2, and the cutting blade 1 is Guide body 1 attached to
0 and 10' are engagement bodies 11 fixed to the support body 3,
The electrode terminals 16, 16', which are laterally movably engaged with 11' and fixed to the cutting blade 1, are also attached to the dovetail members 18, 1 with respect to the mounting body 7 of the support 2.
8', the cutting blade 1 can extend only in the lateral direction and maintains its straightness without meandering. In addition, when the cutting blade 1 is extended, the spring 15 is contracted by that amount, so that the traction and support state of the cutting blade 1 is maintained.
Therefore, even if the cutting blade 1 is heated and undergoes thermal expansion, the material 31 can be cut without any problem.

Incidentally, since the portion of the support 2 in contact with the cutting blade 1 is made of a heat-resistant insulating material, the hollow beam 3 that maintains the strength of the support 2 is hardly affected by the electrical heating of the cutting blade 1. .

Further, the material to be cut 31 is not limited to one made of resin-made front and back fabrics, an intermediate material, and sewing thread overlapped, but at least if the sewing thread is made of resin, the cut end of the sewing thread will melt and deform during cutting. ,
This will be larger than the seam holes in the front and back fabrics, and will prevent fraying.

As described above, since the cutting device according to the present invention cuts the material by heating the cutting blade, the cut end surface of the material is melted, and not only the fraying of the cut end surfaces of the front and back fabrics themselves, but also the fraying of the sewing thread is prevented, and it is possible to prevent the sewing thread from fraying, unlike the conventional method. There is no need to leave fraying allowance when cutting the sewing material. Also, during cutting, the material to be cut is pressed down at the front and rear sides of the cutting part by pressing blades provided on the presser frame, and this pressing is performed so that it is pushed into the clearance groove of the lower die, creating tension between the pressing blades. state,
When the cutting blade makes a cut in this state, the cut portion of the material to be cut will be lifted up along both sides of the cutting blade, so that the cut end will not be separated from the cutting blade and melted more than necessary. The cut end surface of the material to be cut is finished neatly, there is almost no solidification due to melting, and the material to be cut has uniform elasticity over the entire surface. Therefore, the material can be cut to the regular size and there is no wastage of material. This makes it possible to reduce the product cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cutting device according to the present invention;
The figure is an enlarged central vertical sectional view with the material omitted in Figure 1, Figure 3 is a perspective view with some parts omitted, and Figure 4 is a perspective view with some parts omitted.
Figures A and B are lines AA and B-B in Figure 3.
FIG. 5 is a front view of a portion of the material in a cut state, and FIG. 6 is a side sectional view of a portion of the material in the same cut state. In the figure, 1 is a cutting blade, 2 is a support body, 8 is a presser body, 1
0 and 10' are guide bodies, 11 and 11' are engagement bodies, 1
6, 16' are electrode terminals, 20, 20' are cylinders, 21 is a holding frame, 22 is a window hole, 23, 23'
25a, 25b, 25a', 25b' are cylinders, 26 is a lower die, and 31 is an overlapping sewing material.

Claims (1)

[Scope of Claims] 1. A cutting device for cutting an overlapping sheet-like sewn product made by overlapping an outer fabric, an elastic material sheet, and a lining material and sewing them into multiple strips, the cutting device being capable of cutting a sewn product in the form of a layered sheet, which is attached to a support that is moved up and down. a cutting blade which is attached so as to be slidable in the blade length direction and which is heated by applying a voltage between both ends; a window hole located below the cutting blade through which the cutting blade passes; a presser frame that is movable up and down; a presser blade that is provided on the presser frame and presses the front and back of the cut portion of the sheet-like sewn product by the cutting blade; a blade groove that faces the cutting blade and the presser blade; A cutting device comprising a lower die on which opposing escape grooves are formed and on which the sheet-like sewn product is placed.