JPS6060Y2 - Thread rod for tatami sewing machine - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a thread hook for a tatami sewing machine.

This tatami sewing machine is a single chain stitch type tatami sewing machine equipped with a thread bar below the sewing machine needle.Two sewing machines equipped with a tatami floor cutting cutter are installed facing each other, and between these two sewing machines, a tatami face is installed. The tatami floor on which the tatami floor has been stretched is fed while keeping its upper surface height constant, and both sides of the tatami floor are cut at a slight angle with respect to the vertical plane. A double-sided stitching machine has been proposed by the applicant in which stitching is carried out in layers.

This double-sided stitching machine dramatically improves productivity compared to the conventional flat stitching machine, which runs a single sewing machine with the tatami floor fixed. Compared to the machine that holds and feeds tatami mats, even when tatami mats with different thicknesses are supplied, the sewing machine can cut the tatami mats without changing the widthwise position of the sewing machine and change the top width according to the thickness of the tatami mats. They can be made the same without any problems.

However, with the above-mentioned double-sided stitching machine, the tatami floor is pressed against a guide of a constant height from below to maintain a constant upper surface height, and when the tatami floor is replaced, the sewing machine needle must be adjusted. The board on the floor support, which is located below and in contact with the underside of the tatami floor, needs to be lowered once, so during this descent, the board on the floor support hits the thread hook for winding the thread around the sewing machine needle. To avoid this danger, if the height of the thread hook is set low, the thread hook will rotate the bar and wind the thread below the tatami floor around the sewing machine needle that protrudes below the tatami floor. When the thread is attached, the twist angle of the wound thread becomes small, and as a result, when the sewing machine needle is raised, the thread does not catch on the hook of the sewing machine needle and comes off, resulting in skipped stitches.

This invention can be used for the above-mentioned double-sided stitching machine that maintains the top surface height of the tatami floor at a constant level, and also provides a thread hook for the tatami sewing machine that does not cause skipped stitches. It is.

Examples of this invention will be described below with reference to the drawings.

1 is a sewing machine needle for single chainstitch with a spiral hook 1a at the lower end; 2 is a plate that touches the bottom surface of the tatami floor 3 (see Figure 3); It is raised up by a fluid cylinder (not shown) and can be lowered a predetermined distance as required.

A pinion 4 is rotatably provided below the sewing machine needle 1 so that its center is located on an extension line thereof.

This pinion 4 has a center hole 4a for guiding the thread, and meshes with a reciprocating rack 5 to alternately rotate approximately one rotation clockwise and counterclockwise in synchronization with the vertical movement of the sewing machine needle 1. It is.

A guide post 6 is vertically provided on the upper surface of the pinion 4, eccentric from the center hole 4a, and a boss portion 7a of a thread block 7 is slidably fitted into the guide post 6.

The threading block 7 includes a support 7b that projects upward from the upper surface of the boss 7a, and a plate-shaped horizontal protrusion 7c that projects horizontally from slightly below the upper end of the support 7b. This horizontal protrusion 7C is provided with a vertical thread 7d, and the tip of the set screw 8 implanted in the boss portion 7a is cut into the guide column 6 to form a vertical guide. It is slidably fitted into the groove 6a (see FIG. 3).

The above-mentioned thread hooking block 7 is pushed up by a spring 9 compressed between the boss portion 7a and the pinion 4, and when the block 7 is positioned at the uppermost end, the upper end of the strut portion 7b touches the upper end of the guide strut 6. The floor support is located between the board 2 and the board 2.

In the above structure, the thread 10 is pulled out from the package below the pinion 4, passed through the center hole 4a of the pinion 4 and the thread hook 7d of the block 7, and guided to the sewing machine needle 1.

When the tatami sewing machine is driven, the tatami floor 3 moves by a fixed pitch in the direction of arrow P in FIG. 1 for each reciprocation of the sewing machine needle 1, and the pinion 4 makes one reciprocating rotation.

In other words, when the sewing machine needle 1 is descending, the pinion 4
rotates in the forward direction, and threading is carried out by block 7 on the sewing machine needle 1.
A thread 10 is wound around the thread 10, and as the sewing needle 1 rises, the thread 10 is hooked onto the hook 1a and pulled through the tatami floor 3, and then the sewing machine needle 1 is pulled out above the tatami floor 3. In the meantime, the tatami floor 3 is fed a certain distance, and at the same time, the pinion 4 is rotated in the opposite direction, and the threading block 7 is returned to its original position.

At this time, the thread hook should be set at the upper end of the support 7b of the block 7, or the floor support should be in contact with the bottom surface of the tatami floor by setting the position of the block 7 as high as possible. When threading, the thread 10a that connects the thread 7d of the block 7 becomes almost horizontal, and the twist angle of the thread 10a wound around the sewing machine needle 1 increases to nearly 90 degrees, so when the sewing machine needle 1 rises, the hook 1a The thread 10a is reliably caught on the thread 10a, thereby preventing skipped stitches from occurring.

When the board 2 of the floor support is lowered to replace the tatami floor 3, the upper end of the thread block 7 touches the bottom surface of the board 2, and the thread hanger resists the elasticity of the spring 9. Since the block 7 is pushed down, there is no risk of the block 7 etc. being damaged when threading.

Moreover, since the thread hook 7d is bored in the horizontal protrusion 7c slightly below the upper end of the support 7b of the block 7, the thread 10a located on the upper surface of the horizontal protrusion 7c is Therefore, the above thread 1
0a will not be damaged.

In the above embodiment, the thread hook is the boss portion 7a of the block 7.
The column 7b may be formed to be elongated upward and the column 7b may be omitted.

In addition, the guide support 6 and the thread hook are connected to the boss portion 7 of the binder tank 7.
The cross section of a is not limited to a circular shape, but can be formed into a square or other polygonal shape.

Alternatively, the guide column 6 may be formed into a cylindrical shape, and the lower part of the thread block 7 may be inserted into the hollow portion of the guide column 6.

Furthermore, any rotating plate can be used in place of the pinion 4.

As explained above, in this invention, a floor support for supporting the bottom surface of the tatami floor is provided below the sewing machine needle so that it can rotate reciprocally across the board, and the top surface of the rotary plate has a center hole. A guide column is fixed vertically, and a block is attached to the guide column with threads near the upper end so that the block can be slid up and down. Since the upper end of the tatami floor support is positioned so that it can be pushed down between the upper end of the guide column and the lower surface of the board, it is possible to use a double-sided embroidery machine that maintains the top surface height of the tatami floor at a constant level. Even when used in a tatami sewing machine, the thread hook escapes downward as the block is pushed down as the board descends, so the thread hook does not damage the block and prevents replacement of the tatami floor. This can be done without any problems, and skipped stitches can be prevented.

[Brief Description of the Drawings] Figure 1 is a perspective view of an embodiment of this invention, Figure 2 is a plan view,
FIG. 3 is a sectional view taken along the line ■--■ in FIG. 2. 1: Sewing machine needle, 2: Floor support is a board, 3: Tatami floor, 4: Pinion (rotating plate), 4a: Center hole, 6: Guide post, 7: Thread block, 7d: Thread grain, 9 springs.

Claims (1)

[Scope of Claim for Utility Model Registration] [1] Below the sewing machine needle, a floor support for supporting the lower surface of the tatami floor is provided with a plate in between so that it can freely rotate back and forth, and a rotating plate with a center hole bored therein. Fix the guide column vertically on the top surface,
A thread hook having a thread near the top end is attached to the guide post so that the block can slide up and down. The thread hook of the tatami sewing machine is a rod, and the floor support is positioned so that it can be pushed down between the bottom surface of the board. [2] The thread hook block has a boss part that is vertically slidably fitted to the guide post, a support part that projects from the top surface of the boss part, and a support part that projects near the top end of the support pillar. The thread hook of the tatami sewing machine according to claim 1, which is a registered utility model, comprises a horizontal protrusion, and the horizontal protrusion has thread stitches vertically perforated therein. [3] The tatami sewing machine according to claim 1 or 2 of the utility model registration claim, wherein the tatami sewing machine feeds the tatami while keeping the top surface height of the tatami constant. The thread hanger is a stick.