JPH0226458Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is designed to pull out the end of the needle thread cut below the sewing material after the sewing material has been sewn, onto the sewing material.
Regarding the needle thread wiper device of a sewing machine whose one end returns to its original position after crossing the needle thread path from the needle to the workpiece, it is particularly important to keep the drive source of the wiper device and the connecting rod etc. connected to the drive source inside the machine frame. A wiper piece is installed between one end of this connecting rod and one end of a support fixed to the side of the machine frame via a rotating member to achieve compactness, and the connecting rod is attached to the machine frame. This invention relates to a needle thread wiper device for a sewing machine having a structure to prevent oil leakage.

[Conventional technology]

Conventionally, in this type of wiper device, one end of the wiper piece was attached to a support body that supported the machine frame so that it could move up and down within the range of a long hole, and the other end was placed below the chin, and one end of the wiper piece was rotated by a step screw. The wiper piece was supported so that it could be rotated along a vertical plane, and the bending portion at the other end of the wiper piece was configured to move across the needle thread path as a result of the rotation.

In addition, an electromagnetic solenoid with a plunger equipped with a coil spring is installed on the outer surface of the sewing machine frame, and at the tip of the plunger is a connecting rod that is rotatably supported around a pin that extends toward the jaw. will be established. The other end is rotatably connected to the wiper piece with a step screw, and the bent part of the wiper piece is always moved to the right side of the needle 2a as shown in Figure 1 due to the elastic force of the coil spring. It is arranged so that it is located at . When the electromagnetic solenoid is energized, the plunger rises against the coil spring, causing the wiper piece to rotate clockwise around the step screw, and the bent part of the wiper piece moves across the path of the needle thread. It was configured like this.

[Problem that the invention attempts to solve]

In the conventional example described above, an electromagnetic solenoid having a plunger equipped with a coil spring and a connecting rod connected to the plunger are attached to the outer surface of the machine frame of the sewing machine arm, and the connecting rod is directed toward the jaw. Because they extend to the sewing machine arm, they occupy a large amount of space attached to the sewing machine arm,
The overall size of the sewing machine has become large, and this has become a hindrance to sewing work, which has become an impediment to improving work efficiency.

[Means for solving problems]

This idea was made in view of the above-mentioned problems. That is, a rotary solenoid is used as a driving source and is fixed to the machine frame so as to protrude inward from the surface of the machine frame, and a connecting rod is connected to the rotating shaft of the rotary solenoid via a lever. On the other hand, a support body is provided on the outside of the other surface of the machine frame so as to be movable up and down within the range of the elongated hole, and the other end of the support body is disposed below the chin. In addition, a rotating member with a wiper piece is provided between the connecting rod and the support body, and the connecting rod is covered with an oil leak prevention material to the machine frame, thereby solving the problems of the conventional sewing machine. An object of the present invention is to provide a needle thread wiper device.

This idea will be explained below. 1 and 2 are a front view of the sewing machine of this invention and an exploded perspective view of the wiper device with a part omitted.

In FIGS. 1 and 2, 1 is a machine frame, and 2 is a needle bar having a needle 2a.

Further, 3 is a driving source (hereinafter referred to as a rotary solenoid) fixed within the machine frame 1 and protruding inwardly, and the rotary solenoid 3 has its holding plate 3a attached to the machine frame 1 with screws 3b.

4 is a lever having an engagement piece 4a, and the lever 4 is fixed to the shaft of the rotary solenoid 3 with a screw 4b.

Reference numeral 5 designates a connecting rod having a connecting portion 5b having a long hole 5a at one end and a connecting portion 5d having a hole 5c at the other end.
Insert it into a, lock it with a clip, and attach it so that it can rotate.

Reference numeral 6 denotes a support body, one end of which is fixed to the machine frame 1 with a screw 6b so as to be movable up and down within the range of the elongated hole 6a, and the other end forms a connecting portion 6d having a screw hole 6c.

7 is a rotating member which has an engaging piece 7a at one end, a screw hole 7b at the other end, and a hole 7c in the middle.
have each. Next, the engaging piece 7 of the rotating member 7
A is loosely fitted into the hole 5c of the connecting rod 5, and the connecting rod 5 is locked with the clip 8 to be rotatably attached. Next, the rotating member 7 and the support body 6 are connected by a stepped screw 9, and the rotating member 7 is rotatably supported around the shaft portion of the stepped screw 9.

10 is a wiper piece, with a long hole 1 at the base of one end.
0a and a bent portion 10b is provided at the other end. The wiper piece 10 is fixed to the screw hole 7b of the rotating member 7 with a washer 11 and a screw 12 so as to be adjustable within the range of the elongated hole 10a. Reference numeral 13 denotes a first oil-proof cap as shown in FIG. Burn and fix. In addition, the first oil-proof cap 1
The connecting rod 5 passes through the hole 13c at the top of the hole 1.
3c so that it can move up and down. Reference numeral 14 denotes a hemispherical second oil-proof cap made of rubber or the like and having an engagement hole 14a at the top. The second oil-proof cap 14 is attached to the connecting rod 5 at a certain position, and its engaging portion is fixed by gluing or the like, so that the second oil-proof cap 14 can move up and down together with the connecting rod 5.

This invention has the above configuration, and its operation will be explained next.

Now, the sewing machine starts in response to a start signal of the sewing machine, the needle bar 2 moves up and down in a predetermined manner, sews the object to be sewn in cooperation with a needle thread catcher (not shown), and then stops at the top dead center. . Then, just before the needle bar 2 stops, a movable blade (not shown) operates to pull the needle thread connected to the seam below the lower plate (not shown) between it and the fixed blade (not shown) and cut it. At the same time, the presser foot (not shown) also rises.

Subsequently, when the rotary solenoid 3 is energized by an electric signal from the control circuit (not shown) from its original position in Figure 1, its shaft rotates clockwise in Figure 2, so the lever 4 rotates clockwise. Therefore, the connecting rod 5 rises in the direction of the solid arrow shown in FIG. 4 while receiving a horizontal force below it, and the engaging piece 7a of the rotating member 7 moves clockwise.

Therefore, since the rotating member 7 rotates clockwise about the axis of the stepped screw 9, the wiper piece 10 also rotates clockwise as shown in FIG. As a result, the bent portion 10b of the wiper piece 10 moves across the path of the needle thread, and holds the needle thread in its recess. Next, when the rotary solenoid 3 is rotated counterclockwise by an electric signal from the control circuit, the wiper piece 10 rotates in the direction of the dotted arrow while holding the needle thread and returns to its original position (see Figure 1). To do this, the needle thread end is removed to a separate location above a presser plate (not shown).

Then, if the needle bar 2 descends at the beginning of the next stitch,
The needle thread end comes out of the bent portion 10b, and the same operation is repeated thereafter.

Furthermore, since the connecting rod 5 swings up and down due to the rotation of the lever 4, the engagement portion between the connecting rod 5 and the through hole 13c of the first oil-proof cap 13 can slide up and down due to the elasticity of rubber or the like. The second oil-proof cap 14 was fixed to the connecting rod 5 so as to maintain a permissible airtightness and cover the first oil-proof cap 13 at a position above the first oil-proof cap 13.
The automatic oil supply pump supplies oil to the movement mechanism section of the upper shaft through the core of the upper shaft, and the oil is scattered and transmitted through the lever 4 and the connecting rod 5, and covers the outer periphery of the second and first oil-proof caps 14 and 13. The oil then flows to the bottom of the surface of the machine frame 1 and is collected in the oil tank (not shown) of the sewing machine via the suction pipe.

Therefore, the rotary solenoid 3, lever 4,
Even if the connecting rod 5 is accommodated within the surface of the machine frame 1, the connecting rod 5
There is no possibility that the oil will ooze or leak to the outside and stain the workpiece.

[Other Examples]

The second oil-proof cap 14 may be made of metal, and the same effect can be obtained even if it is formed integrally with the connecting rod 5.

[Effect of idea]

As described above, this invention has the above-mentioned structure and produces the following effects.

The problem of work efficiency, which was an obstacle to sewing work due to the large size of the entire sewing machine and the protruding parts such as connecting rods, as in the conventional example, has been solved. Since the rod 5 is accommodated, the sewing machine is compact and integrated, and oil leakage due to oil scattering is completely solved, so that the sewing material and the sewing thread are not soiled.

[Brief explanation of the drawing]

Figure 1 is a front view of the sewing machine of this invention, Figure 2 is an exploded perspective view with some parts omitted, Figures 3a and b are perspective views of the first and second oil-proof caps, which are the main parts, FIG. 4 is an explanatory diagram of the operation.

Claims (1)

[Scope of Claim for Utility Model Registration] Due to forward movement, the tip moves across the needle thread path between the needle and the workpiece, and returns after pulling out the needle thread end cut below the workpiece onto the workpiece. A wiper device for a sewing machine includes: a drive source 3 fixed to the machine frame 1 so as to protrude inward from the machine frame 1; a lever 4 fixed to an operating portion of the drive source 3 and supported within the machine frame 1; A connecting rod 5 connected to the lever 4 so as to move up and down.
, a support 6 fixed along the outside of the other side of the machine frame 1 and extending along the lower surface of the chin; one end rotatably supported on the connecting rod 5 and the middle rotatably supported on the support 6; A rotating member 7, and a bent portion 10b fixed to the other end of the rotating member 7 and having a bent portion 10b at the tip.
A wiper piece 10 with
A first oil-proof cap 13 is fixed to the lower surface of the machine frame 1 by extending downward to cover the outside of the outer periphery of the connecting rod 5 and having a through hole 13c penetrated therethrough; a second oil-proof cap 14 fixed to the connecting rod 5 and covering the outer periphery of the connecting rod 5 and also covering the first oil-proof cap. wiper device.