JPH0129594B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support device for a feed roller in a cloth feed device of a sewing machine.

[Conventional technology]

Place the feed roller on the back of the presser foot,
In the cloth feeding device of a sewing machine, which feeds the cloth forward by rotating the feed roller intermittently in one direction, it is necessary to rotate the cloth feed roller in synchronization with the feed teeth. The cloth feed roller is rotated using the shaft as a drive shaft.

FIG. 3 shows a rotational drive device for a cloth feed roller, in which an outer ring 3 is fitted on the outside of an eccentric ring 2 fixed to the end of the upper shaft 1, and a rod 4 provided on the outer ring 3 is fitted to the outer ring 3.
An L-shaped arm 5 is connected to the end of the sewing machine arm, and the L-shaped arm 5 is connected to one end of a drive shaft 6 arranged parallel to the upper shaft 1, and the drive shaft 6 is attached to the back side of the sewing machine arm. The drive shaft 6 is rotatably supported by a bearing block 8, so that the rotation of the upper shaft 1 causes the drive shaft 6 to rotate in the direction of the set angle.

Further, the rotation of the drive shaft 6 is controlled by the support shaft 1 through a swing arm 9 attached to the other end of the drive shaft 6 and a rod 10 connected to the swing arm 9.
Among the forward and reverse rotations of the drive cylinder 12, only the rotation in the direction of arrow A in FIG. 3 is transmitted to the drive cylinder 12 fitted on the outside of the cylinder 1. I'm trying to convey it to you.

Note that a mechanism for transmitting rotation in one direction of the forward and reverse rotation of the drive cylinder 12 to the feed roller 13 is shown in Japanese Utility Model Publication No. 56-7251.
It is publicly known.

[Problem that the invention sought to solve]

The feed roller 13 is preferably provided close to the presser foot 14 in order to move the cloth in a straight line, but conventionally, as shown in FIG. support,
The roller arm 15 is connected to the end of a support arm 16 fixed to the bearing block 8 by a pin 17, and the roller arm 15 is supported swingably around the pin 17, and the roller arm 15 is supported by a spring 18. The roller arm 15 is configured to be pushed downward, and the roller arm 15 is inclined downwardly so as not to obstruct the movement of the cloth. Therefore, when the feed roller 13 moves upward due to a change in the thickness of the fabric, or when the feed roller 13 is lifted upward when backstitching the fabric, the feed roller 13 moves upward around the pin 17. Therefore, the feed roller 13 cannot be provided close to the presser foot 14, which is disadvantageous.

Therefore, the technical object of the present invention is to solve the above-mentioned disadvantages and to enable a feed roller to be provided close to the presser foot.

[Means for solving problems]

In order to solve the above problems, the present invention supports the support shaft of the feed roller arranged on the back of the presser foot with a bracket, and connects one end of a pair of links arranged vertically and parallel to the bracket, The other end of the link is connected to a support arm, the upper part of the support arm is attached to a bearing block attached to the sewing machine arm, and the bracket is pushed down by a spring.

[Effect]

In the roller support device having the above configuration,
Since the bracket moves up and down while maintaining a horizontal position, when the feed roller moves in the vertical direction, the feed roller does not come very close to the presser foot, and as a result, the feed roller is placed close to the presser foot. be able to.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings. Incidentally, parts that are the same as those shown in FIG. 3 described above are given the same reference numerals, and explanations thereof will be omitted.

As shown in the figure, a drive shaft 6, which is driven to rotate in forward and reverse directions, is rotatably supported by a bearing block 8 fixed to the back surface of a sewing machine arm 19. This bearing block 8 has a support arm 16. In the embodiment, the support pin 20 is attached to the bearing block 8, and the support arm 16 is attached to the support pin 20 so that the angle can be adjusted, but the support arm 16 may be provided integrally with the bearing block 8.

The support arm 16 and the bracket 21 disposed in front of it are connected by a pair of links 22 and 22' disposed vertically and in parallel, and the torsion spring 23 provided outside the support pin 20 is connected to the upper link 22. is pushed downward.

A support shaft 11 is supported at the bottom of the bracket 21, and a drive cylinder 12 and a feed roller 13 are supported by the support shaft 11. The drive cylinder 12 includes a connecting piece 12', and the connecting piece 12' and the swing arm 9 fixed to the end of the drive shaft 6 are connected by a rod 10, and when the drive shaft 6 rotates, the drive cylinder 12 moves in the correct position. It rotates in the opposite direction by a set angle, and the rotation in one direction is transmitted to the feed roller 13. The rotation angle of the feed roller 13 can be adjusted by changing the connection position of the rod 10 along the elongated hole 9' provided in the swing arm 9.

The transmission mechanism that transmits the rotation of the drive cylinder 12 in one direction to the feed roller 13 is a known mechanism as shown in Japanese Utility Model Publication No. 56-7251, and in the case of the embodiment, it is also a known mechanism as shown in Japanese Utility Model Publication No. 56-7251. Since a mechanism is adopted, the explanation of its configuration will be omitted.

The above-mentioned feed roller 13 is arranged on the back of the presser foot 14 and comes into contact with a guide roller 24 arranged below it, so that the cloth is held between the guide roller 24 and fed by the rotation of the feed roller 13. . This feed roller 13 may be brought into contact with the upper surface of the bed 34 of the sewing machine.

The feed roller support device shown in the embodiment has the above-mentioned structure, and its operation will be explained next.

Now, when the drive shaft 6 is rotated in the forward and reverse direction of the set angle, the swing arm 9 swings, and the drive cylinder 12 is rotated in the forward and reverse direction of the set angle. The rotation of the drive cylinder 12 in one direction is transmitted to the feed roller 13, so the feed roller 13 rotates intermittently in the direction of the arrow in FIG.
The cloth can be fed forward by the feed roller 13 and guide roller 24.

During the feeding process, when thick fabric enters, the feed roller 13 is pushed up, and the bracket 21 rises while maintaining a horizontal state. When thin fabric enters, it is pushed down by the elasticity of the spring 23, and the thickness of the fabric changes. Feed roller 1 corresponding to
3 follows.

In the case of the embodiment, the feed roller 13 is arranged coaxially with the drive cylinder 12, but the support shaft of the drive cylinder 12 and the support shaft of the feed roller 13 are separated, and each support shaft is supported by a bearing block. , a rotation transmission cylinder is interposed between the drive cylinder 12 and the support shaft via a one-way clutch, and a reversal prevention mechanism is provided between the feed roller 13 and the support shaft to prevent rotation of the rotation transmission cylinder in one direction. The support device of the present invention can also be applied to a cloth feeding device that transmits information to a feeding roller via a pulley belt mechanism.

〔effect〕

As described above, in this invention, the bracket that supports the drive cylinder and the feed roller and the support arm whose upper part is connected to the bearing block are connected by a pair of links arranged in parallel, so that the bracket can be moved up and down. Since it is supported, even if the feed roller moves upward due to a change in fabric thickness, it does not come too close to the presser foot, and as a result, the feed roller can be placed close to the presser foot.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of a support device according to the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a perspective view showing a conventional feed roller support device. 1... Upper shaft, 8... Bearing block, 13... Feed roller, 14... Presser foot, 19... Sewing machine arm, 21... Bracket, 22, 22'... Link, 23... Spring.

Claims (1)

[Claims] 1. A cloth feeding device in which a feeding roller is arranged on the back of the presser foot and the feeding roller is rotated intermittently in one direction using the upper shaft of the sewing machine as a driving shaft.
supporting the support shaft of the feed roller with a bracket;
One end of a pair of links arranged vertically and parallel to each other is connected to the bracket, the other end of the link is connected to a support arm, and the upper part of this support arm is attached to a bearing block attached to the sewing machine arm. A support device for a feed roller in a fabric feed device of a sewing machine, characterized in that a bracket is pushed down by a spring.