JPS61272090A - Yarn cutting method and apparatus of plural-needle double ring stitch sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is a vertically swinging, multi-needle, double chainstitch sewing machine that mechanically and automatically removes the bobbin thread even when the sewing operation is finished halfway through the fabric. The present invention relates to a method and apparatus capable of cutting.

``Prior Art'' Conventionally, in vertical multi-needle double chain stitch sewing machines, there are various known thread cutting devices for cutting sewing thread at the edges of fabric. However, if the stitching operation is completed in the middle of the fabric, the stitcher rotates the handle wheel in the opposite direction of normal sewing machine operation, removes the thread loop of the needle from the looper, and then attaches it to the leg of the fabric presser foot. The only option is to manually cut the sewing thread with scissors, etc. by pulling the fabric out from the seam while lifting the sewing machine.If the thread cannot be automatically cut mechanically and the sewing process ends halfway through the fabric. This method is extremely difficult and time consuming, and has the disadvantages of wasting a relatively large amount of yarn.

``Problem to be solved by the invention'' Even when the sewing work of a vertically swinging multi-needle double chainstitch sewing machine ends halfway through the fabric, it is easy to mechanically and automatically cut the thread without wasting the thread. The present invention aims to provide a possible method and apparatus.

``Means for Solving the Problems'' In the present invention, a plurality of movable blades, each of which has a bobbin thread hooked thereon, are moved in a curved manner in the horizontal and vertical directions, and are sequentially brought into contact with a single fixed blade, so that the uncut blades are machined. By automatically tightening the bobbin thread, even when the work on a vertically swinging multi-needle double chainstitch sewing machine is finished halfway through the fabric, the bobbin thread can be easily threaded and the wasted part of the thread can be minimized. It has now become possible to cut efficiently.

``Embodiment and Effects'' The attached drawings show an example of carrying out the present invention, in which 1 is a frame of a sewing machine, and 2 is a thread cutting device mounting plate fixedly attached to the frame. Reference numeral 7 designates a movable blade actuating plate, and two guide grooves 3° 4 curved at right angles are bored in the movable blade actuating plate in parallel to each other.

Guide pin screws 5 and 6 are fixedly protruded from the surface of the thread cutting device mounting plate 2 and are slidably inserted into the guide grooves 3 and 4, respectively. 8 is a piston of a cylinder 9, and the tip of the piston 8 is pivoted 10 to the base of the blade actuating plate 7. 11 is the base of the cylinder, and the base end is attached to the frame 1 with a cylinder swing pin screw 12. It is pivoted to the tip of the cylinder support arm 13. Reference numeral 14 denotes a movable blade attachment piece, which is fixedly attached to the tip of the movable blade attachment plate 7 with a movable blade attachment piece set screw 15. Reference numeral 16 denotes movable blades, which are installed in an arbitrary number (depending on the number of stitches of the sewing machine) in parallel in the horizontal or right angle direction on the movable blade attachment piece 14. 17 is a fixed blade,
It is fixedly attached to the thread cutting device mounting plate 2 facing the movable blade 16 and supported from above by a fixed blade holding plate 18.

Reference numeral 19 denotes a movable blade advance stopper which is protruded from the upper surface of the thread cutting device mounting plate 2 so as to face the movable blade operating plate 7. Reference numeral 20 denotes a movable blade retraction stopper, which is protruded from the upper surface of the thread cutting device mounting plate 2 so as to face the movable blade operating plate 7. Reference numeral 21 denotes a needle holder, and 22 an arbitrary number of needles, which are attached to the needle holder 21 in a known manner.

23 is a throat plate, 24 is a lever presser, 25 is a retainer, 126 is a looper, and other mechanical parts are also known.

The present invention has the above-mentioned structure, and to explain the thread cutting operation state in detail, first, the piston 8 of the cylinder 9 whose base end 11 is pivoted to the tip of the cylinder support arm 13 whose base end is pivoted to the sewing machine frame 1. When the movable blade actuating plate 7 is pushed out, the pivoting portion 10 of the movable blade operating plate 7, which is pivoted to the tip of the piston 8, is pressed.

When living in the house, the movable blade operating plate 7 must be moved by this pressure. When the piston 8 is in the most retracted state into the cylinder 9 (as shown by the solid line in FIG. 3), the guide pin screws 5 and 6 are located at the leftmost end in the lateral direction of the guide groove 3.4, and the movable blade 16 is When the piston is pushed out, the movable blade actuating plate 7 moves, which is located at the position indicated by the phantom lines in FIG. It is controlled by the movement of the position, and the movable blade actuating plate 7 moves linearly to the left,
(As shown by arrow a in Fig. 2) It is further guided by a guide groove 3°4 curved in the longitudinal and lateral directions, and is pressed in the vertical direction from the left-hand pole. Blade 1
6 moves in the direction of arrow C, the movable blade 16 reaches the position shown by the solid line in FIG. 2, and the movable blade operating plate 7 moves in the direction of arrow C.
It is located at the position shown. Piston 8 in art
changes in the direction of being drawn into the cylinder. Then, contrary to the above, the movable blade actuating plate 7 which was in the position of FIG. 3 7a and the movable blade 16 which was in the position of 16a are
It will move backwards along the arrow C in the figure, grasp the needle thread 27, looper thread 28, etc. there, move vertically, and then change direction and move horizontally as shown by arrow a in Figure 2. Finally, the movable blade moves to the position indicated by the phantom line in FIG. 2, and in the process, it comes into contact with the fixed blade 17 and sequentially cuts the threads of each of the plurality of needles.

"Effects of the Invention" In the present invention, various complicated manual operations are required even when the stitching operation is completed in the middle of the fabric using a vertically swinging multi-needle double chainstitch sewing machine. By equipping the sewing machine with a simple mechanical device, it is possible to automatically and mechanically cut the sewing thread without wasting a large amount of thread. , which can be operated with high efficiency and has a wide range of effects.

[Brief explanation of drawings]

The attached drawings show one example of carrying out the present invention, and Fig. 1 is a perspective view of the main parts of the device, Fig. 2 is a perspective view showing the relationship with the fixed blade, and Fig. 3 is a movable blade actuating plate and cylinder. FIG. 1... Sewing machine frame, 2... Thread cutting device mounting plate, 3.4... Guide groove, 5.6... Guide pin screw,
7 - Movable blade operating plate, 8 - Piston, 9 - Cylinder, 10 - Piston, 11 - Base of cylinder, 12 - Swing pin screw, 13 - Cylinder support arm, 14 - Movable blade mounting piece, 15 - Set screw, 16 - Movable blade, 17 - Fixed blade, 18 - Fixed blade presser plate, 19 - Movable blade forward stopper, 20 - Movable blade backward stopper, 21 - Needle stopper, 2
2 - Needle, 23 - Throat plate, 24 - Presser foot, 25 - Retainer - 12G - Louver, a, b, c - Arrow.

Claims (1)

[Claims] 1. A plurality of vertically swiveling needles characterized in that a plurality of movable blades hooking threads of the plurality of needles are converted and moved in vertical and horizontal curved directions, and are sequentially contacted and cut by one fixed knife. How to cut thread on a double chainstitch sewing machine. 2. A movable blade operating plate is provided with two guide grooves that are curved vertically and horizontally in parallel with each other, and a guide pin screw is fixedly drilled and slidably inserted into each of the guide grooves, and the movable blade The end of the power unit for advancing and retracting is pivotally attached to the base of the actuating plate, a plurality of movable blades are arranged in parallel at the tip of the movable blade actuating plate, and one fixed blade is fixed facing the movable blades. A thread cutting device for a vertically swinging multi-needle double chainstitch sewing machine. 3. A thread cutting device mounting plate was fixedly attached to the frame of the sewing machine, and a movable blade actuating plate having two guide grooves curved in the longitudinal and lateral directions formed in parallel to each other was bored in the thread cutting device mounting plate. slidingly inserting guide pin screws into both guide grooves,
The tip of a piston of a cylinder whose base end is pivoted to the sewing machine frame is pivoted to the base 2a of the movable blade actuating plate, and the base of the movable blade attachment piece is fixed to the tip of the movable blade actuating plate, and the movable blade is attached. A thread cutting device for a vertically swinging multi-needle double chainstitch sewing machine, characterized in that an arbitrary number of movable blades are arranged in parallel on one piece, and a fixed blade is fixed on the thread cutting device mounting plate at a position facing the movable blade. . 4. A movable blade actuation plate having two parallel guide grooves curved in the vertical and horizontal directions is slidably attached to each of the guide grooves using fixed guide pin screws, and the movable blade actuation plate is The end of the power unit for advancing and retracting is pivotally attached to the base, a plurality of movable blades are arranged in parallel at the tip of the movable blade actuation plate, a movable blade advance stopper is fixed facing the movable blade actuation plate, and the movable blade actuation plate A vertically swinging multi-needle machine, characterized in that an operating blade retraction stopper is fixed facing the movable blade, a fixed blade is fixed facing the movable blade, and a fixed blade holding plate is provided for the fixed blade. Thread cutting device for heavy chainstitch sewing machine.