JPS6110625Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a chain stitch sewing machine, and particularly to a mounting structure for a looper in a bed portion.

[Conventional technology]

Conventional chainstitch sewing machines have a structure in which a wall with a bearing hole hangs down from the bottom of the bed part, and a support shaft with a fixed looper is inserted and supported into the bearing hole.The sewing machine can be turned over to attach and position the looper. was working. In addition, the wall with the bearing hole is provided with a predetermined length in the axial direction to prevent the support shaft from tilting, or two are provided at intervals, so the position adjustment work of the looper is performed by adjusting the angle slightly at the outer periphery of the support shaft. Must be changed.

[Problem that the invention attempts to solve]

This invention eliminates the inconvenience of not being able to install or adjust the position of the looper without tipping over the sewing machine, and also eliminates the disadvantage that fine adjustment of the looper position can only be made using the same method as general adjustment and is difficult to perform. be.

[Means to resolve the problem]

In this invention, one end of the looper support shaft in the axial direction of the space in the bed section that accommodates the looper is open, and a support shaft that supports the same end of the support shaft is installed near the open end of the space. ,
A wall having a hole into which the other end of the coaxial shaft is inserted and supported is erected at the back of the space.

[Effect]

With the above configuration, this invention allows the looper and the support shaft to be attached and positioned from one side of the bed without overturning the sewing machine. Also, when fixing one end of the support shaft with a support,
This also allows for fine adjustment of the looper position.

〔Example〕

A detailed explanation will be given below with reference to the drawings. In the figure, reference numeral 1 denotes a sewing machine frame having an arm portion 1a and a bed portion 1b protruding in parallel.

2 is the needle. Reference numeral 3 denotes a support body for supporting the needle, which is supported so as to be vertically slidable on a guide rod 4 fixed to the tip of the arm portion 1a. Reference numeral 5 denotes a lever whose center is swingably supported around a horizontal axis 6, and one end of which is rotatably and slidably connected to the support 3. The other end of the lever 5 is connected to an eccentric position of a large-diameter wheel 7 via a link 8, and the large-diameter wheel 7 is connected via a belt 11 to a small-diameter wheel 10 rotated by a motor 9. .

As the motor 9 rotates, the small diameter ring 10 and the large diameter ring 7 rotate, the link 8 moves up and down, the lever 5 swings around the shaft 6, and the support body 3 moves up and down together with the needle 2.

Reference numeral 12 denotes a sewing object support surface, that is, a needle plate, which is provided on the upper surface of the bed portion 1b facing below the needle 2, and forms a space 14 between it and a bottom wall 13 provided at a distance below the needle plate. ing. Space 14 is bed part 1b
It is open toward the end, and the open surface is covered with a lid 15 that can be opened and closed. As shown in FIG. 3, the lid 15 has a U-shaped hook 15a on one side and an S-shaped hook on the other side.
Each of the letter-shaped elastic pieces 15b is protruded to fill the space 14.
The outer wall of the bed portion 1b at the open end thereof is provided with protrusions 16 and 17 corresponding to the hooking pieces and elastic pieces. The lid 15 has a latch piece 15a on one protrusion 16.
is hung, the entire lid is rotated using the hooking piece 15a as a fulcrum, and the elastic piece 15b is mounted by riding over the other protrusion 17 due to its elasticity.

A cam 18 is fixed to the end of a shaft 19 that rotates together with the large-diameter ring 7, and is located within the space 14 and has a cam action groove 18a that opens in the same direction as the open surface of the space.
has. A driven lever 20 has a pin 20a inserted into the cam groove 18a at one end, and a boss 20b pivotally fitted to the support shaft 21 at the other end.

Reference numeral 22 designates a looper, which has a tip-shaped portion 22a at its tip that forms a stitch together with the needle 2, and a cylindrical base portion 22b that fits into the boss portion 20b of the driven lever;
It is fixed with screws 23. The support shaft 21
extends toward the back from the open end of the space 14 and is located substantially parallel to the throat plate 12 . A hole 2 is formed in the wall 24 that stands up at the back end of the space.
4a, the end on the open end side is supported by a plate-shaped support 25, and the lower part of the support 25 is attached to the vertical stepped surface 13a of the bottom wall 13 provided on the open end side of the space 14. It is fixed with screws 26.

Reference numeral 27 denotes a spring in which the support 25 is inserted between the boss portion 20b and the driven lever 20 in pressure contact with the cam action groove 18a.

As the needle 2 moves up and down, the cam 18 also rotates. The looper 22 swings together with the driven lever 20 around the support shaft 21 along the cam groove 18a, and also swings in the axial direction of the support shaft 21 along the axial unevenness at the bottom of the cam groove 18a. Sliding. As a result, the tip-like portion 22a of the looper 22
The sewing machine forms stitches by capturing the loop of thread formed on the needle 2 side, or by inserting the needle 2 into the loop of thread on the side of the tip 22a, in the same way as a regular chainstitch sewing machine. It is. Note that the looper 22 may be replaced with a looper for double chain stitching in which a through hole for carrying the bobbin thread is formed in the tip-shaped portion 22a.

The looper 22 is attached to the support shaft 2 together with the driven lever 20.
1 and is assembled into the space 14 from its open end. To roughly adjust the position of the looper 22 with respect to the needle 2, place the looper 22 on the bed portion 1 facing the screw 23.
Insert a tool such as a screwdriver into the hole 28 provided on the outer wall of b, loosen the screw 23, and remove the looper 2.
2 by changing the angle on the outer periphery of the driven lever boss portion 20b or by sliding it in the axial direction. Then screw 2
3 to fix the position of the looper 22. For fine adjustment, loosen the screw 26 of the support 25 and shift the support 25 along the vertical stepped surface 13a, swing the support shaft 21 around the hole 24a, and slightly change the position of the looper 22. Let's do it. Of course, tighten the screw 26. The latter method is easier and faster to make small positional adjustments than the former method.

A hole for inserting the screw 26 may be formed in the support 25 to be long in the direction of movement as shown in FIG. This is sufficient for fine-tuning.

[Effect of idea]

As described above, in this invention, one end of the looper support shaft in the axial direction of the space that accommodates the looper in the bed portion is open, and the end of the support shaft on the same side is supported near the open end of the space. Since a support is attached and a wall with a hole into which the other end of the coaxial shaft is inserted and supported is raised up at the back of the space, the looper can be moved along with the support shaft in its axial direction, that is, in a direction parallel to the support surface of the workpiece. The sewing machine can be assembled into the space in the bed from the sewing machine, and there is no need to overturn the sewing machine as in the conventional sewing machine. Further, when fixing the support at the end of the support shaft, the position of the looper can be finely adjusted by slightly moving the support, which provides excellent effects such as easy adjustment work.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a sewing machine embodying this invention, FIG. 2 is an enlarged left side view of the end of the bed with the cover removed, and FIG. 3 is a horizontal sectional view of the end of the bed. Explanation of symbols, 1b...Bed part, 2...Handle, 1
4...Space, 18...Cam, 21...Support shaft, 2
2... Looper, 24... Wall, 24a... Hole, 2
5...Support.

Claims (1)

[Claims for Utility Model Registration] 1. A looper that forms a stitch in cooperation with the needle is provided in a bed portion having a support surface for the workpiece to be sewn on the upper surface facing below the needle, with a support shaft substantially parallel to the front support surface. In a chainstitch sewing machine in which the looper is driven by a cam that is swingably supported around the needle and rotates in synchronization with the vertical movement of the needle, the axial direction of the support shaft of the space that accommodates the looper in the bed portion One end is formed open, and a support supporting the end on the same side of the support shaft is installed near the open end of the space, and a wall having a hole for inserting and supporting the other end of the support shaft is erected at the back of the space. A chain stitch sewing machine that is characterized by being raised. 2. The chain stitch sewing machine according to claim 1, wherein the open end of the space is covered with an openable and closable lid.