JPS631877B2 - - Google Patents

Description

[Detailed Description of the Invention] Description of the Technical Field The present invention relates to a pattern sewing device for a sewing machine, and particularly to a pattern sewing device for sewing a pattern that has overlapping cloth and has a guide rail having the same shape as the edge of the cloth to be sewn.
This invention relates to a pattern sewing device that sews edges of cloth while being forcibly moved by a drive device.

Explanation of conventional technology Conventionally, as this type of technology,
As described in the above issue, a pattern having an outer periphery having the same shape as the edge of the fabric to be sewn and a top surface of a guide rail having a similar shape to the outer periphery is superimposed on the top surface of the fabric to be sewn, and the guide rail is The pattern is engaged with a guide pin provided on the frame and inserted into the underside of the presser foot of the sewing machine.

By driving the sewing machine from this state,
A known sewing machine has a structure in which the pattern is moved along a guide rail by the cloth feed mechanism of the sewing machine while sewing the edges of the cloth.

However, with this type of conventional device, the means for moving the pattern is the fabric feeding device of the sewing machine, which makes it difficult to feed large patterns, the feeding amount is unstable, and the length of one stitch There are disadvantages such as uneven stitching, which deteriorates the quality of the sewn product.

Purpose of the Invention The purpose of the present invention is to improve this point, and to make it possible to sew large pieces of cloth using a large pattern, and to obtain a high-quality sewn product with uniform stitch length. shall be.

Summary of the Invention The present invention includes a sewing machine and a sprocket that rotates in conjunction with a drive source, and a flat pattern plate having a fixedly arranged guide pin and a rack gear that meshes with the guide rail and the sprocket on the upper surface.

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

Figure 1 shows a sleeve 1 of a knitted fabric sewn by the device of the present invention.The shape before stitching is flat with curved edges on both sides. It is folded in half and the curved edges 2 are sewn together to form a cylindrical sleeve 1.

FIG. 2 shows the manufacturing process of the presser pattern 3 of the present invention, taking the sleeve sewing shown in FIG. 1 as an example. First, as shown in Fig. 2A, draw a line 5 having the same shape as the curved edge 2 of the sleeve 1 on one side of the square plastic substrate 4, and cut that part using a plastic cutter as shown on the right. do.

Next, as shown in Fig. 2B, a cut 7 is made in the flat part of the guide rail 6 made of aluminum with an L-shaped cross section, so that the guide rail 6 has the same shape as the curve 2 as shown by the two-dot chain line. After bending to form a curved edge 8, it is adhered to the upper surface of the substrate 4 with double-sided tape or adhesive as shown on the right.

Next, as shown in FIG. It is adhered to the substrate 4 with adhesive as shown on the right.

Next, as shown in FIG. 2D, an auxiliary guide rail 11 made of the same L-shaped aluminum material as the guide rail 6
Make a cut 12 in the flat part of the guide rail 6
After bending into almost the same shape to form the curved edge 13, the curve 13 is slightly to the right of the curve 8 of the guide rail 6 as shown on the right side of FIG. 2D. It is attached to the upper surface of the substrate 4 using double-sided tape or adhesive.

Furthermore, a moquette cloth 14 (sixth
(Fig.) is attached using adhesive, etc.

Then, make two sets of this presser foot pattern.

3, 4, and 5 are schematic perspective views showing a control device 15 that controls the presser pattern 3, a sewing machine 16 that sews the material to be sewn, and a stacking device 17 that laminates the material to be sewn.

The sewing machine 16 is arranged so that its cloth feeding surface coincides with the top surface of the table 18, and has a needle 19 and a thread loop catcher (not shown) such as a looper that captures the needle thread loop to form a stitch. However, it does not have a cloth feeding mechanism.

The control device 15 is provided on the machine frame of the sewing machine 16, and 20 is a mounting plate whose base is fixed to the back surface of the machine frame of the sewing machine and has a bent vertical mounting surface 21. 22 is a support body, which is fixed to the mounting surface 21. Reference numeral 23 denotes a support shaft, which is supported so as to be able to move up and down relative to the support body 22, and has a bifurcated bearing 2 at its lower end.
form 4. Reference numeral 25 denotes an upper and lower body, which is freely fitted vertically into the forked part 27 of the forked body 26 whose one end is fixed to the support shaft 23 and the other end is fixed to the support body 22, and an arm 28 which extends forward. The base of is fixed. 29 is a pressure spring, which is wound around the support shaft 23 between the upper and lower bodies 25 and the support body 22;
The pressure of the pressing spring is adjusted by an adjusting screw 30 screwed onto the upper surface of the spring. 31 is a Bowden cable, one end of which is connected to a bending rod 33 provided on the upper and lower bodies 25, and the other end is connected to a cylinder (not shown). 34 is a rotating shaft rotatably supported on the bearing 24;
In this case, a feed sprocket 35 is fixed inside the bearing 24, and a sprocket 36 is fixed outside the bearing 24. 37 is a rotary transmission, which is disposed above the sewing machine frame, and whose input shaft is connected to a drive source (not shown) via a belt 38, and whose output shaft 39 is connected via a spline shaft and a universal joint 40. A rotating shaft 4 rotatably supported at the tip of the arm 28
Connect to 1. 42 is a sprocket fixed to the rotating shaft 41, and a timing belt 43 is stretched between it and the sprocket 36 below. Reference numeral 44 shown in FIG. 3 is a guide pin support plate, whose lower part is bent laterally to support two rotatable guide pins 45a and 45b at a position close to the needle. 46 shown in FIG. 4 is a plate whose base is fixed to the bearing 24,
An air cylinder 47 is supported at its tip, and an auxiliary roller 49 is provided at the lower end of the rod 48 of the air cylinder.

Reference numeral 50 shown in FIGS. 4 and 5 is an air cylinder, which is provided on the surface of the table 18 at the rear of the sewing machine, and a push-out body 51 is provided at the tip of the rod. The reference numeral 52 shown in FIG.
The base of the table 18 is rotatably supported around a shaft 54 below the table 18, and its tip is bent and extends downward behind the table 18, and a push-up rod 55 is supported at the extended end. 56 is an air cylinder whose base is supported by the leg 57 of the table 18, the tip of a rod 58 is connected to the push-up plate 53, and when the rod 58 rises, the push-up plate 53 is moved around the shaft 54. The push-up bar 55 is raised above the upper surface of the table 18 as shown in FIG. 8B.

Reference numeral 17 shown in FIG. 5 is a well-known stacking device, which is composed of a stacking table 59, a presser bar 60, and a stacking bar 61 as shown in FIG.

Next, the operation of the present invention will be explained.

Each part before sewing when the sewing machine is stopped is first connected to the wire 32 of the Bowden cable 31 shown in FIG.
is pulled upward, and the upper and lower bodies 25 rise against the spring 29. As a result, the sprockets 42 and 36 supported by the arm 28 and the bearing 24 also rise, and the feed sprocket 35 is also in the raised position. The sewing machine's presser foot (not shown) is also in the raised position, and the fourth
The rod 48 of the air cylinder 47 shown in the figure is also raised, and the auxiliary roller 49 is in the raised position. Furthermore, the rod 58 of the air cylinder 56 shown in FIG.
The push-up bar 55 is moved upwardly from the top surface of the table 18 as shown in FIG.

Then, the flat sleeve 1 to be sewn is folded in half on the table 18 by aligning the curve 2 as shown in FIG. As shown by the two-dot chain line in the figure, the presser pattern 3 is placed parallel to the edge of the pattern, and in this state, the presser pattern 3 is slid on the table top surface, the rack gear 9 is placed below the feed sprocket 35, and the guide rail 6 is the guide pin 45a,
45b below the control device 15.

When the start switch is turned on in this state, first the traction of the wire 32 of the Bowden cable shown in FIG. 4 of the control device 15 is released, and the support shaft 2
3 is lowered by the force of the spring 29. As a result, the feed sprocket 35 meshes with the rack gear 9 of the presser pattern 3, as shown by the two-dot chain line in FIG. The rod 48 is also lowered, and the auxiliary roller 49 is lowered to one side of the auxiliary guide rail 11 as shown in FIG. 2D. At the same time, the presser foot (not shown) of the sewing machine is lowered onto the seam edge of the sleeve 1, and the rod 58 of the air cylinder 56 shown in FIG. to table 18
It is below the top surface. Furthermore, the start switch
When turned ON, the drive source starts with a slight time delay, and the rotary transmission 37 and the sewing machine are driven. When the rotary transmission 37 rotates, the rotation of the output shaft 39 is transmitted to the spline shaft, the universal joint 40, and the sprocket 42. , timing belt 4
3. The rotating shaft 34 rotates via the sprocket 36, which rotates the feed sprocket 35, and the presser pattern 3 moves in the direction of arrow E in FIG. 7 with the guide rail 6 guided by the guide pins 45a and 45b. At the same time, the sewing machine stitches the edge of sleeve 1.

When the above-mentioned stitching is started and the presser pattern 3 reaches the position shown in FIG. When the presser pattern 3 is moved in the opposite direction, a counterclockwise rotating force is generated on the presser pattern 3, and as a result, the presser pattern 3 gradually rotates along the guide rail 6 and moves toward the curved edge of the sleeve 1. are sutured accurately.

At the position where the sewing machine finishes sewing the sleeve 1, a sensor detects the end of the sleeve or the end of the presser pattern 3, and a signal is generated.

After this signal is generated, the drive source first stops with a slight time delay, and as a result, the sewing machine stops, the rotary transmission 37 stops, the feed sprocket 35 stops, and at the same time the cylinder etc. The wire 32 of the Bowden cable 31 shown in FIG. 4 is pulled, so that the support shaft 23 rises against the spring 29. Then, the rotation transmission system such as the sprocket timing belt supported by the support shaft 23 rises, and the feed sprocket 35 rises and separates from the rack gear 9, and the guide pin 4
5a and 45b also rise above the guide rail 6.
Also, the rod 48 of the air cylinder 47 in FIG.
is raised, and the auxiliary roller 49 is also brought to the raised position.

Further, in response to the end detection signal, the rod 58 of the air cylinder 56 shown in FIG.
The push-up bar 55 shown in FIG. At the same time, the presser bar 60 of the laminating device 17 shown in FIG.
Press the tip of the
The stacking rod 61 in Figure B moves so that the rear of the sleeve 1 passes over the top surface of the stacking table 59 as shown in C, and stacks the sleeve 1 on the stacking table 57.

Furthermore, as shown in FIG. 8C, the air cylinder 50 of the push-out body 51 facing the side surface of the presser pattern 3 shown in FIG. The finished presser pattern 3 is pushed out toward the operator on the side of the movement path of the presser pattern 3 during stitching, as shown by the solid line in FIG. After that, the presser bar 60 of the laminating device 17
The stacking rod 61 returns to its original position as shown in FIG. 8A, and the extruded body 51 also returns to its original position as shown by the two-dot chain line in FIG.

In addition, while the sewing part of the sleeve 1 is being sewn using the presser pattern 3 described above, the other presser pattern prepared in two sets is placed on the table and prepared on the folded sleeve 1 to be sewn next. Then, after the previous sleeve 1 has been sewn and stacked on the stacking table, immediately insert the next presser foot pattern under the raised feed sprocket 35 and start the next stitch, repeating the procedure. and suture continuously.

Although the above illustrated embodiment shows a presser pattern for sewing the curved edges of sleeves, the present invention can also be applied to, for example, side stitching of the body and other objects having various curved edge shapes.

Effects of the Invention As described above, the present invention includes a rack gear provided on the upper surface of the presser pattern and a guide rail having the same shape as the cloth edge guided by a guide pin, and the rack gear is forcibly rotated by a drive source. Since the presser foot pattern is sent by meshing with the feed sprocket that is being sewn, the feed of the workpiece is stable and products with uniform seam pitch are always obtained, improving the commercial value of sewn products and providing a large feed force. Therefore, it is possible to sew large objects to be sewn, which is highly versatile, and furthermore, even an amateur worker can accurately sew the curved edges of the object to be sewn.

Furthermore, since there is no misalignment of the stacked fabrics, the stitching becomes accurate and the patterns of the stacked fabrics can be sewn accurately, which improves the product price. There are other effects.

[Brief explanation of the drawing]

Figure 1 is a perspective view of sleeves sewn together, Figure 2A
~D is a plan view showing the manufacturing process of the presser foot pattern, FIG. 3 is a perspective view of the sewing machine as seen diagonally from the front,
Fig. 4 is a perspective view of the device seen diagonally from the rear of Fig. 3, Fig. 5 is a perspective view of the rear of the table, Fig. 6 is a sectional view of the right side of Fig. 2D, and Fig. 7 is a view of the presser pattern. The plan view and FIGS. 8A to 8C are operation diagrams showing the operation of the laminating device installed behind the table and the relationship between the push-up rod and the extrusion body, and FIG. 9 is an operation diagram showing the operation of the extrusion body of the presser pattern. be. 3... Presser pattern, 6... Guide rail, 9
... Rack gear, 11 ... Auxiliary guide rail, 4
5a, 45b...Guide pin, 35...Feed sprocket, 49...Auxiliary roller.

Claims (1)

[Scope of Claims] 1. A sewing machine having a suturing unit consisting of a needle and a thread ring capture device, a support shaft that always receives an elastic acting force downward and is movable up and down in the vertical direction, and a support shaft of the support shaft. A feed sprocket is supported at the lower end and rotates around a horizontal axis perpendicular to the direction of cloth movement in conjunction with a drive source, two guide pins are placed close to the sprocket, and the side edges along the edges of the cloth to be sewn are a flat presser pattern made of synthetic resin having on its upper surface a rack gear consisting of a guide rail having the same shape as the fabric edge and engaging with the guide pin, and a flat timing belt that engages with the sprocket and is arranged in approximately the same shape as the fabric edge; A pattern sewing device for a sewing machine equipped with and.