JPS61268290A - Feed roller support apparatus in cloth feeder of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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]

In the cloth feeding device of a sewing machine, a feed roller is arranged on the back of the presser foot, and the feed roller is rotated intermittently in one direction to feed the cloth forward. Since it is necessary to rotate the cloth at the right timing, the cloth feed roller is normally rotated using the upper shaft as the drive shaft.

FIG. 3 shows the rotational drive device of the cloth feed roller, and the upper shaft 1
An outer ring 3 is fitted on the outside of the eccentric ring 2 fixed to the end of the eccentric ring 2, and an L-shaped arm 5 is attached to the end of a rod 4 provided on the outer ring 3.
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 can be rotated by a bearing 7 and a bearing block 8 attached to the back of the sewing machine arm. The upper shaft 1 is supported so that the drive shaft 6 rotates in the forward and reverse directions of the set angle as the upper shaft 1 rotates.

Further, the rotation of the drive shaft 6 is transmitted to the drive cylinder 12 fitted on the outside of the support shaft 11 via a swing arm 9 attached to the other end of the drive shaft 6 and a rod 1o connected to the swing arm 9. Among the forward and reverse rotations of the drive cylinder 12, the rotation in the direction of arrow A in FIG. 3 is transmitted to the feed roller 13 supported coaxially with the drive cylinder 12.

Note that a mechanism in which rotation in one direction among the forward and reverse rotations of the drive cylinder 12 is transmitted to the feed roller 13 is disclosed in Japanese Utility Model Publication No. 156-7251 and is well known.

[Problem that the invention seeks to solve]

In order to move the cloth straight, the feed roller 13 is
Although it is preferable to provide the presser foot close to the presser foot 14, conventionally,
As shown in FIG. 3, the support shaft 11 of the feed roller 13 is supported by a roller arm 15, and the roller arm 15 is fixed to the bearing block 8. A pin 17 is attached to the end of the support arm 16.
The structure is such that the roller arm 15 is supported swingably around the pin 17, and the roller arm 15 is pushed down by the spring 18. It is sloped with a downward slope. 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 during back stitching of the fabric, the feed roller 13 moves upward around the pin 17. There is a disadvantage that the feed roller 13 cannot be provided close to the presser foot 14 because it moves in a circular motion and approaches the presser foot 14.

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 placed on the back of the presser foot with a bracket,
The bracket is connected to a support block attached to a fixed part such as a sewing machine arm by a pair of links arranged vertically in parallel to support the bracket in a vertically movable manner,
The structure includes a spring that pushes down the bracket.

[Effect]

In the roller support device configured as described above, the bracket moves up and down while maintaining a horizontal position, so 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 presser foot The feed roller can be placed close to the gold.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.
This will be explained based on the diagram. Components that are the same as those shown in FIG. 3 described above will be described with the same reference numerals.

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

The support arm 16 and the bracket 2 placed in front of it
1 is a pair of links 22, 22' arranged vertically in parallel.
A torsion spring 23 provided on the outside of the support pin 2° pushes the upper link 22 downward.

A support shaft 11 is supported at the bottom of the bracket 21, and the drive cylinder 12 and the feed roller 13 are supported by the support shaft 11. The drive cylinder 12 includes a connecting piece 12',
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 rotates by a set angle in the forward and reverse directions. rotation 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 long hole 91 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 the embodiment also uses the mechanism shown in the above publication. , so 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 ped 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 directions of the set angle, the swing arm 9 swings, and the drive cylinder 12 rotates in the forward and reverse directions 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. 1, and the feed roller 13 and guide roller 24 can feed the cloth forward. can.

At the time of feeding, when a thick fabric enters, the feed roller 13 is pushed up and the bracket 21 rises while maintaining a horizontal state. When a thin fabric enters, it is pushed down by the elasticity of the spring 23, and the thickness of the fabric increases. The feed roller 13 follows the change.

In the case of the embodiment, a feed roller 13 is provided coaxially with the drive cylinder 12.
However, the support shaft of the drive cylinder 12 and the support shaft of the feed roller 13 are separated, each support shaft is supported by a bearing block, and a one-way clutch is interposed between the drive cylinder 12 and the support shaft. A cloth feeder in which a rotation transmission cylinder is interposed, a reverse prevention mechanism is provided between the feed roller 13 and the support shaft, and rotation of the rotation transmission cylinder in one direction is transmitted to the feed roller via a pulley belt mechanism. The support device of the present invention can also be applied to devices.

〔effect〕

As described above, in this invention, the bracket supporting the drive tube and the feed roller and the support block are connected by a pair of links arranged in parallel to support the bracket so as to be movable up and down, so that the feed roller has a heavy structure. Due to the change, even if it moves upward, 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]

Figure 3 is a perspective view showing a conventional feed roller support device;
The figure is a front view showing an embodiment of the support device according to the present invention.
FIG. 2 is a side view of the same as above. 1... Upper shaft, 8... Support block, 13... Feed roller, 14... Presser foot, 19... Sewing machine arm,
21...Bracket, 22, 22'...Link,
23...Spring patent applicant Ken Sando Miyamoto Agent Kama 1) Text 2 Figure 1 8 Figure 2

Claims (1)

[Claims] In a cloth feeding device in which a feed roller is arranged on the back of the presser foot and the feed roller is rotated intermittently in one direction using the upper shaft of the sewing machine as a driving shaft, the support shaft of the feed roller is supported by a bracket, and the The bracket is connected to a support block attached to a fixed part such as a sewing machine arm by a pair of links arranged vertically in parallel to support the bracket in a vertically movable manner, and a spring is provided to push down the bracket. A support device for a feed roller in a fabric feed device of a sewing machine.