JP2529723Y2 - Sewing machine thread remover - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a thread wiping device for a sewing machine. Thus, a yarn wiper that is easy to manufacture has been devised.

[Prior Art] Conventionally, as this type of device, a device disclosed in Japanese Utility Model Application Laid-Open No. 60-143579 is known in which a wiper is driven by arranging a four-bar link that is arranged below a jaw portion and interlocks with a solenoid. I have. These thread wipers have a drawback that the handling of the cloth is hindered because the four-node link occupies a space on the cloth sending side.

When the solenoid is excited, the wiper moves to the position where the needle thread is locked, and then returns to the original position due to the restoring elastic force of a spring or the like due to the non-excitation of the solenoid, and the needle thread is removed from the work. Since the needle thread is pulled out, the needle thread cannot be removed at the time of sewing a thick material with a restoring elastic force of a spring or the like.
There was also a disadvantage. Further, when the sewing machine cannot be completely removed, that is, when the wiper does not return to the original return position while hooking the needle thread, or when the sewing machine is restarted by mistake,
The needle thread is tensioned by a hook, a balance, etc. for the next seam, and as a result, the wiper is pulled by the needle thread into the trajectory of the needle that moves up and down, causing collision damage, and sometimes there is a possibility that damaged debris may fly into the eye. There were safety shortcomings.

As a solution to these problems, for example, Japanese Utility Model Publication No. 61-7664
However, in these, the swing links are exposed and arranged in the space on the sending-out side of the cloth. However, there were drawbacks such as damage to the oscillating link, insufficient feeding of the cloth, and no operation of the wiper. In addition, there are drawbacks such as swinging links and links hitting the hands and fingers of the worker on the cloth sending side, and the number of various links, pins and parts is large and the whole becomes complicated, resulting in high cost, repair and trouble. There were drawbacks.

Further, since the guide portion of the supporting member for guiding the swing link is located at a position lower than the needle plate and close to the cloth presser and opposed to the cloth presser bar, the presser foot when attaching and removing the cloth There was also a disadvantage that the amount of rise was not sufficient.

Furthermore, when replacing with various types of presser foot corresponding to various sewing operations, there is a disadvantage that it is difficult to replace the presser foot.

[Problems to be solved by the invention]

This invention was made in order to solve the above-mentioned problems, while increasing the pulling force of the needle thread,
The purpose is to obtain a thread wiper that expands the space on the cloth sending side and ensures the operation of the wiper even if the cloth on the sending side accumulates, and is compact in size and easy to manufacture with a minimum number of parts. And

[Means for solving the problem]

The thread removing device of the sewing machine according to the present invention includes a driving unit,
A moving body having a guide shaft and a shaft provided at a position different from the guide shaft and connected to the driving means; a wiper connected to the shaft of the moving body; A long groove formed with the shaft loosely fitted with the shaft, a straight groove portion formed in a direction parallel to the long groove, and a lower end of the straight groove portion continuous with an arc centered on the lowermost end of the long groove; A guide groove having an arc-shaped groove portion formed therein, and a guide groove in which the guide shaft is loosely fitted, and a support attached to an arm of the sewing machine, wherein the guide shaft and the shaft are each provided with the guide. In a state where the guide is regulated by the direct groove portion of the groove and the long groove, the moving body biased by the driving means moves obliquely downward, and the shaft moves to the lowermost end of the long groove, The wiper moves to a position where the upper thread can be locked, After the shaft reaches the lowermost end of the long groove, the wiper connected to the shaft of the moving body by moving the guide shaft downward along the arc groove portion with the shaft as a fulcrum. The upper thread is rotated to remove the upper thread.

[Example of the invention]

One embodiment of the present invention will be described with reference to FIG.
(1) is an arm, (2) is a vertically moving needle bar arranged on the arm (1), (3L) and (3R) are two needles attached to the lower end of the needle bar (2), and a bed ( The stitch is formed on the cloth (6) by the cooperation of a shuttle (not shown) provided below the needle plate (5) attached to the upper surface of the cloth (4), and the operation intended by the operator. , A thread cutting device (not shown) interlocking with the needle stops after the operation near the top dead center of the needle. This thread cutting device is a known device for cutting upper and lower threads below a bed (4). A presser bar (7) is supported on the arm (1) so as to be able to move up and down near the needle bar (2) so as to extend in parallel with the needle bar (2), and a cloth presser (8) is mounted at the lower end thereof. (9) is a rotary solenoid mounted on the upper part of the arm (1). After the needle thread and bobbin thread are cut by the thread cutting device, the needles (3L) and (3R) stop near their top dead center. The drive arm (10) is rotated in a clockwise direction by a predetermined angle and then de-energized, and is rotated counterclockwise by the restoring force of a spring (not shown) so as to return to its original position. Has become.

(11) is a support attached to the side surface of the arm (1). A pair of supports (13L) and (13R) that hang down from the attachment (12) to the left and right in a U-shape across the cloth feed direction line. Having.
(14L) and (14R) are provided in the pair of left and right long grooves provided in the support portions (13L) and (13R), respectively, and (15L) and (15R) are provided in the support portions (13L) and (13R), respectively. , Slot (14
L) and guide grooves extending in parallel grooves (16L) and (16R) parallel to (14R) and arc grooves (17L) and (17R).

(18) is a moving body which is loosely fitted so as to be sandwiched between the pair of support portions (13L) and (13R) and can be interlocked in the vertical direction and the horizontal direction of the cloth feeding direction, and is orthogonal to the cloth feeding direction. Axis (1
9) and guide shaft (20) are installed. The shaft (19) is attached to the moving body (18) with screws (21). Axis (1
9) is loosely fitted on the long shafts (14L) and (14R) so as to be movable only in the longitudinal direction of the long groove, and the guide shaft (20) is also moved only in the longitudinal direction of the guide grooves (16L) and (16R). It is loosely fitted as possible. As shown in FIG. 5, the guide shaft (20) is axially moved by the retaining rings (22L) and (22R) so as not to be separated. (23) is a link whose upper end is rotatably connected to the drive arm (10) by a pin (24). The lower end of the link loosely fits into the groove (25) of the moving body (18) and has a guide shaft ( 20) is rotatably connected. (26) is a U-shaped wiper and a screw (27) at both ends of the shaft (19).
L) and (27R) are fixedly mounted. (29) is a cloth sending space portion, and the cloth (6) is sent to the left side by the cloth sending means of the sewing machine, so that the cloth may accumulate.

Next, the operation of the thread removing device of the sewing machine according to the present invention will be described. FIG. 1 shows a state in which the drive arm (10) is pulled down in a counterclockwise direction by a spring (not shown) built in the solenoid (9), and the guide shaft (20) is moved through a pin (24) and a link (23). ) Is pulled upward as shown in FIG. This makes long grooves (14L) and (14R) and guide grooves (15L) and (15R)
The movable body (18), which is loosely fitted and guided, is pulled up as shown in FIG. 1 and the shaft (19) is in contact with the uppermost portion of the long grooves (14L) and (14R), and the guide groove is provided. (20) is located at the uppermost part of the guide grooves (15L) and (15R). In this state, the tip of the wiper (26) is above the presser foot (8),
It is in a position where it does not hinder the presser foot (8) that moves up and down due to a knee operation or the like of the operator. After the sewing operation is completed, the needle thread (28) is cut below the needle plate (5) by a thread cutting device (not shown), and when the needles (3L) (3R) stop near the top dead center, the solenoid (9) is turned off. ) Is excited and the drive arm (1
1) rotates clockwise as shown in FIG. 1 to FIG. 3, whereby the link (23) moves downward, and the moving body (18) is moved via the guide shaft (20) into the guide groove (15L). , (15R), while being guided and restricted by the straight grooves (16L) and (16R) and the long grooves (14L) and (14R), the shaft (19) is tilted obliquely to the lowermost end of the long grooves (14L) and (14R). It moves as shown in FIG. Thereby, the tip of the wiper (26) comes from the position above the presser foot (8) shown in FIG. 1 to a position where the needle thread (28) can be locked as shown in FIG. The solenoid (9) is in the energized state further, and the drive arm (10) further rotates clockwise from FIG. 3 to FIG. Since the shaft (19) is in contact with the lowermost end of the long groove (14L) (14R), the counterclockwise rotation of the drive arm (10) following FIG. 3 causes the guide shaft (20) via the link (23). ) Is guided by the circular grooves (17L) and (17R) of the guide grooves (15L) and (15R), while the moving body (18) is in contact with the lower end of the grooves (14L) and (14R). Is rotated counterclockwise about the fulcrum. For this reason, the wiper (26) holds the needle (3) with the needle thread (28) locked.
L) and (3R) are passed near the tip, and the needle thread (28) is lifted vertically upward with respect to the bed surface where it is easy to pull out. As a result, the end of the needle thread (28) comes out of the upper surface of the work clamp (8).

Thereafter, when the excitation of the solenoid (9) is released, the drive arm (1) is restored by the restoring action of the spring built in the solenoid (9).
0) rotates counterclockwise, which causes the link (23)
Is pulled back, so that the guide shaft (20) is
The moving body (18) is pulled up along the circular arc grooves (17L) and (17R) of (L) and (15R), and the moving body (18) rotates clockwise about the shaft (19) as a fulcrum, and is in a state shown in FIG. Further, the drive arm (10) is rotated counterclockwise by a spring built in the solenoid, and returns to the original position shown in FIG. Along with this, the wiper (26) also returns to the position above the presser foot (8) in the original state shown in FIG. 1 and raises and lowers the presser foot (8) by the knee operation of the operator in order to attach and detach the cloth (6). And return to a position that does not interfere. Even if the cloth (6) accumulates in the space (29), the cloth (6) first hits the fixed supports (13L) and (13R) and is pressed down. There is no hindrance.

[Effect of the invention]

As described above, according to the present invention, since the movement of the moving body consists of the movement of the sewing machine in the cloth feeding direction and the vertical direction and the rotation, a large space space is normally secured on the cloth feeding side. At the same time, there is an effect that the wiper can perform a reliable yarn removing operation when the upper yarn is removed. Moreover, since the guide groove and the long groove are provided with the support, there is an effect that a complicated operation of the wiper can be realized with a small number of parts, a compact and simple configuration.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the present invention, FIG. 2 is a first side view, FIGS. 3 and 4 are explanatory views of the operation following FIG. 1, and FIG. It is sectional drawing in the -V line. In the figure, (1) is an arm, (2) is a needle bar, (3L),
(3R) is a needle, (4) is a bed, (5) is a needle plate, (6) is a cloth, (7) a presser bar, (8) is a cloth presser, (9) is a solenoid, and (10) is a drive. Arm, (11) is a support, (12) is a mounting part, (13L) and (13R) are support parts, (14L) and (14R) are long grooves, (15L) and (15R) are guide grooves, and (16L) ), (16R) are parallel grooves, (17L), (17R) are arc grooves, (18) is a moving body,
(19) is a shaft, (20) is a guide shaft, (21) is a screw, (22L)
(22R) is snap ring, (23) is link, (24) is pin, (2
5) is a groove, (26) is a wiper, (27L) and (27R) are screws. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Scope of request for utility model registration] 1. A thread removing device for a sewing machine for removing an upper thread between a needle and a presser foot after a thread is cut by the thread cutting sewing machine, comprising: a driving means; a guide shaft; and a shaft provided at a position different from the guide shaft. A moving body connected to the driving means; a wiper connected to the shaft of the moving body; a long groove formed to be inclined in a downward direction of the needle and having the shaft loosely fitted therein; The guide shaft has a linear groove portion formed in a direction parallel to the groove and an arc groove portion formed continuously with the lower end of the linear groove portion on an arc centered on the lowermost end of the long groove. A guide groove fitted and provided with a support attached to the arm of the sewing machine, with the guide shaft and the shaft being guided by the linear groove portion and the long groove of the guide groove, respectively, The moving body biased by the driving means moves obliquely downward. By moving the shaft to the lowermost end of the long groove, the wiper moves to a position where the upper thread can be locked, and after the shaft reaches the lowermost end of the long groove, the guide shaft is A wiper connected to the shaft of the moving body to be rotated by moving the wiper downward along the arc-shaped groove portion with the shaft as a fulcrum, thereby removing the upper thread; apparatus.