JPS6040313B2 - Folding mechanism of welt sewing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. It is transferred from the first layer to the second position, and during this transfer, two parallel machine stitches S are performed on the inner side of the folded portions on both sides of the beading fabric P, and these fabrics are sewn at the same time. Regarding the welt sewing device in which a pocket hole is cut between these two seam lines S by a knife that operates in synchronization with the sewing mechanism, it is particularly important to move the welt fabric P in cooperation with the welt presser foot of the cloth transfer mechanism. This invention relates to a folding mechanism for folding and holding the paper in an inverted T-shape.

For this type of device, patent application No. 53-6912
No. 1 The device described above is known, and according to this, a support body (corresponding to the lifting body 5b of the main twill described later) and a presser foot are integrally formed, and these are fixedly moved via an amotor. The lower surface of the presser foot is moved slightly (approximately 2
Since the structure is such that it stops at a position that is far away from the top, if the thickness of the body fabric W and the welt fabric P is thicker than the gap between the top surface of the work table and the bottom surface of the presser foot, both fabrics will not work properly. Due to strong pressure on the top surface of the table, the beaded fabric P does not slide smoothly through the presser foot when being transferred by the fabric transfer mechanism, which may cause seam wrinkles or, in severe cases, make it impossible to transfer both fabrics. Also, if the thickness of both fabrics is thinner than the gap between the top surface of the workbench and the bottom surface of the presser foot, when the sewing machine needle pierces both fabrics and comes out, both fabrics will be pulled upward by the frictional force with the needles. There are disadvantages such as so-called flapping of the fabric, skipped stitches, and shifting of the welt fabric. Adjustment according to the thickness required complicated work that required skill and effort.

It is an object of the present invention to solve the drawbacks of the above-mentioned secondary structure with a simple structure.

Embodiments of the present invention will be described below with reference to the drawings.

In the illustrated embodiment, as shown in Fig. 4, a beaded fabric P is folded in an inverted T-shape and overlapped on a sewing material W constituting the body fabric of the garment, and a flap is further folded onto the beaded fabric P. After overlapping the fabrics F, these fabrics are transferred from the first layer to the second position across the seam part of the sewing machine, and during this transfer, they are moved to a position inward from the folded parts on both sides of the welt fabric P. Two parallel sewing machine stitches S are performed, and at the same time as these fabrics are sewn, a pocket hole is cut out between these two seam lines S using a scalpel that operates in synchronization with the sewing mechanism.Finally, a corner knife is used to cut out a pocket hole at both ends of the pocket hole. The present invention relates to a welt sewing device that makes a cone-shaped incision. A sewing machine 2 placed in the middle on the workbench 1, a body material W,
The welt cloth P and the flap cloth F are lined along the upper surface of the workbench 1 from the first pupil of the two-dot chain line in FIG.
The fabric transfer mechanism 3 for moving to the second position (345 ribs) shown by the solid line in the figure cooperates with the beaded presser foot 4, 4 (Figure 2) provided on the fabric transfer mechanism 3 at the first position. Body fabric W
A folding mechanism 5 having a presser foot 5a for folding and overlapping the beaded cloth P in an inverted T-shape on top, and two seams that are completely attached during transfer by the cloth transfer mechanism 3. A center knife mechanism 6 for cutting out a pocket hole (not shown) between S, a corner knife mechanism (not shown) for making a fusuma-like cut at both ends of the pocket hole when transferred to the second position, and a sewing machine. A stacker (not shown) for taking out the finished body fabrics W from the fabric transfer mechanism 3 and stacking them on a loading table, and a control device (not shown) for controlling each of these mechanisms and the sewing machine in a scheduled order. It consists of

The sewing machine 2 is a known two-needle sewing machine that includes three sewing machine needles 8 at the lower end of a needle bar 7 and is linked to a sewing machine motor (not shown). A slit 9 parallel to the cloth transfer direction (left side in Fig. 1) is vertically formed between both needle holes of the workbench 1, and a body is inserted into the slit 9 in conjunction with the operating mechanism in the sewing machine bed. The center scalpel 6 for cutting pocket holes in the fabric W and the edge cloth P is provided so as to protrude and retract from the upper surface of the needle slope in synchronization with the needle bar 7. As shown in FIGS. 1 and 3, the folding mechanism 5 comprises the presser foot 5a and an elevating body 5b which is movable up and down with a predetermined stroke via a air motor (not shown in detail). The presser foot 5a is moved vertically relative to the lifting body 5b.
The vertically long longest hole 54 formed in the vertical leg part 53 of the presser foot 5a is provided with a free iron to the support shaft 52 horizontally supported on the guide part 51 that hangs vertically downward from one side of the lower end of b. , the guide plate 55 is supported on the support shaft 52 so as to form a groove in which the leg portions 53 play in cooperation with the guide portion 51, and two nuts 56 and 57 are screwed into the tip of the support shaft 52 for guidance. The position of the plate 55 is fixed. In addition, a hole 5 is provided at the lower end of the elevating body 5b.
8 is formed, and a coil spring 59 having a weak elastic force is compressed and disposed between the hole 58 and the upper end surface of the rock portion 53. The relationship between the lifting body 5b and the presser foot 5a is normally as shown in FIG. The presser foot 5a moves slightly upward against the coil spring 59 relative to the elevating body 5b, thereby keeping the welt fabric P light during sewing even if the fabric thickness changes. Body fabric W
It acts to prevent the beading fabric P from fluttering due to friction with the fabric when the needle 8 pierces or comes out of the beading fabric P by pressing and holding the needle 8 upward. Further, the presser foot 5a has a needle hole 2 which is open at the front end in the cloth feeding direction and which faces the needles 8, 8 of the sewing machine 2.
9 and 29 are formed through the upper and lower sides. For details of the drive mechanism of the elevating body 5b, please refer to the specification and drawings of Japanese Patent Application No. 53-69129.

The workbench 1 is formed with a groove 10 extending vertically in the cloth transfer direction at the rear of the sewing machine 2, and a guide shaft 11 and a screw shaft 12 are supported along the groove 101 on the lower surface of the workbench 1. The screw shaft 12 rotates in forward and reverse directions in conjunction with a transfer pulse motor (transfer motor). The cloth transfer mechanism 3 includes a transfer table 13 whose lower part is supported by the screw shaft 12 and the guide shaft 11 and is movable in the scale line direction in conjunction with the rotation of the screw part 12, and an upper part of the transfer table 13. A pair of clamp arms 15, 15 supported by rattan 14, which are not shown in the drawings, are pulled upward by the elastic force of a spring, and are pushed downward via air cylinders, and both clamp arms. body cloth pressers 16, 16 fixed to the free ends of body cloth pressers 15; and a receiving plate 17 fixedly arranged at a distance above the body cloth pressers 16, 16.
, 17, the body material presser 16 and the receiving plate 17,
The welt presser feet 4, 4 are always held resiliently at the position indicated by the two-dot chain line in Fig. 2 by a spring, and are movable via the air cylinder to the position indicated by the solid line in the figure. The spring cylinder 19 is maintained at the position indicated by the dashed dotted line by the spring.
19 (second), and a flap presser foot 18, which is pressed to the position shown by the solid line in the figure. and,
The relationship between the cloth transfer mechanism 3 and the folding mechanism 5 is such that the cloth W is inserted between the lower surface of the cloth pressers 16 and 16 and the upper surface of the workbench 1 in the first position indicated by the two-dot chain line in FIG. By depressing a foot pedal (not shown) that can be stepped to the first step, both clamp arms 1 are moved through the air cylinder.
5 and 15 are rotated clockwise in FIG. 1 against the spring,
As a result, the body fabric pressers 16, 16 descend and press the body fabric W, and then the welting cloth P is held so that the center part thereof is the body fabric presser 16,
16, and by pressing the foot pedal to the second stage, the presser foot 5a of the folding mechanism 5 moves from the solid line position in FIG. After descending between the two-body fabric pressers 16 and 16 and pressing the center of the welt fabric P onto the body fabric W, each of the welt fabric pressers 4, 4 move through air cylinders to the position indicated by the solid line in Figure 2. position, bend the left and right sides of the welt cloth P into an inverted T-shape along the circumference of the presser foot 5a, and then when sewing the flap cloth F, make sure that the green edge to be sewn is The flap presser foot 1 is placed on one of the receiving plates 17 so as to be located on one of the bent portions of the welt cloth P, and the pedal is depressed to the third stage.
8 and 18 are rotated via air cylinders 19 and 19 to the position shown by the solid line in FIG. 2 and pressed onto the folded portion of the welt cloth F.

As shown in FIG. 1, both flap pressers 18, 18 are formed with elongated long holes 20, 20 extending vertically in parallel with each other along the cloth transport direction, and are opposite to each other along the entire length of these elongated holes 20, 20. The upper surfaces of the beaded presser feet 4, 4 are used as reflective surfaces, and the sewing machine jaw section in front of the sewing point of the sewing machine 2 in the cloth transport direction is set in the position shown by the solid line in FIG. 2 at the position shown by the two-dot chain line in FIG. , two sets of cloth edge detection means 21 consisting of a light emitting body that irradiates light from above toward the elongated holes 20, 20 and a light receiving body that receives the light reflected from the reflective surface of the welt presser foot 4, 4; 21 will be installed.

In addition, the upper surface of the receiving plates 17, 17 indicates or regulates the position of the rear end of the flap cloth F (right side in Fig. 1) so that the sewing machine 2 stops immediately after the rear end of the flap cloth F passes through the sewing machine seam. Positioning means 22, 22 are provided for this purpose. As described above, according to the present invention, the beading cloth is pressed onto the body fabric, and the cross section is cut on both sides of the sewing machine so that the beading cloth is bent and held in an inverted T-shape in cooperation with the beading presser foot. The presser foot is shaped like an inverted T and has a needle hole through which both needles can pass. An elevating body is vertically movably supported on the machine frame above the workbench so that it descends to the top surface of the workbench in the general section of the sewing machine before moving the transfer mechanism, and rises to the outside of the sewing section when the sewing machine stops, and a fabric transfer mechanism. an elastic body disposed between the lifting body and the presser foot so as to press the welt cloth toward the top surface of the workbench as the lifting body descends to an extent that allows movement of both fabrics accompanying the mechanism; With this structure, both thick and thin fabrics are always lightly pressed against the top surface of the workbench, so there is no need to adjust the gap between the presser foot and the workpiece depending on the thickness of the fabric, preventing fabric slippage. This has the effect of reliably preventing skipped stitches.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of this device with some parts omitted, Fig. 2 is a longitudinal cross-sectional view showing how the cloth transfer mechanism and folding mechanism work together, and Fig. 3 shows the support state of the presser foot against the lifting body. The illustrated perspective view, FIG. 4, is a perspective view showing the overall state of the body fabric, beading fabric, and flap fabric. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A sewing machine with a twin needle fixed on the horizontal top surface of the workbench, a body material presser that presses the body material against the workbench top surface, and a welt cloth presser that presses the welt fabric on top of the presser foot, which are linked to a motor. and a cloth transfer mechanism that can be moved along the top surface of the workbench between a first position and a second position where the sewing machine seam part is sandwiched together with both fabrics. In the welt sewing device, which moves the sewing machine to two positions and sews both fabrics together during the movement period, it presses the welt fabric onto the body fabric and cooperates with the welt presser foot. The presser foot 5a has an inverted T-shaped cross section with a width wider than the distance between the two needles of the sewing machine, and has a needle hole through which both needles can pass, so as to bend and hold the beaded fabric in an inverted T-shape. The presser foot is supported so as to be relatively movable up and down, and the presser foot is lowered to the upper surface of the workbench within the sewing machine's sewing section before the cloth transfer mechanism moves through the driving means, and is moved out of the sewing section when the sewing machine is stopped. An elevating body 5 is supported on the machine frame above the work table so as to be able to move up and down with a constant stroke, and a welt cloth is connected to the lowering of the elevating body to the extent that it can allow movement of both fabrics accompanying the cloth transfer mechanism. A folding mechanism for a beading device, comprising an elevating body and an elastic body 55 having elasticity disposed between the legs of a presser foot so as to press it toward the top surface of a workbench.