JP2000300876A - Device for intermittently feeding fabric in sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a device for intermittently feed a fabric in a sewing machine with a simple constitution. SOLUTION: A frame 21 integrally moving up and down with a pressor foot 16, a roller support 22 rockably fitted on this frame 21 and whose roller shaft 24 is rotatably mounted on the bottom end part, a roller 26 being rotatably fitted on the roller shaft 24 of this roller support 22 through a one directional clutch and being brought into press contact with a fabric, a driving lever 31 fitted on a needle rod 12 for holding a needle 13, and a lever mechanism 40 fitted on the frame 21 and driven by means of the driving lever 31 to rotate the roller shaft 24 of the roller support 22, are provided and the roller 26 is rotated in the feed direction of the fabric through the lever mechanism 40 when the needle is raised and the roller shaft 24 and the roller 26 are pushed out in the feed direction of the fabric when the fabric press 16 is raised.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermittent cloth feeding device for a sewing machine for automatically feeding a cloth to be sewn.

[0002]

2. Description of the Related Art Conventionally, an intermittent cloth feeder for a sewing machine transmits rotation of a servomotor (not shown) to a reduction gear 2 through a belt 1 as shown in FIG. The roller 4 is attached to the cloth 3 and pressed against the cloth 5 to be sewn.

[0003] When the servomotor is rotated, the roller 4 rotates, so that the fabric to be sewn is fed forward.

[0004]

In the above-mentioned conventional structure, since the servomotor and the speed reducer are used, the cost is high, and it is difficult to adopt it for all types of sewing machines. Cost reduction was demanded.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a low-cost intermittent cloth feeder with a simple configuration and a low cost.

[0006]

According to the first aspect of the present invention, a description will be made by attaching reference numerals used in the embodiments.
6, a frame 21 which moves up and down integrally with
A roller support 22 rotatably mounted on the lower end and a roller shaft 24 rotatably mounted on the lower end thereof;
A roller 26 rotatably attached to the second roller shaft 24 via a one-way clutch 25 and pressed against the cloth;
And a lever mechanism 40 attached to the frame 21 and driven by the drive rod 31 to rotate the roller shaft 24 of the roller support 22. When the needle 13 is rotated, the roller 26 is rotated in the cloth feeding direction via the lever mechanism 40, and the cloth presser 16 is configured to push the roller shaft 24 and the roller 26 in the cloth feeding direction when the cloth presser 16 is raised. The cloth is automatically fed when the needle 13 is raised.

A lever mechanism 40 according to a second aspect of the present invention has an elongated hole 45 at an intermediate portion, one end of which is rotatably mounted on the frame 21 and the other end of which is driven by a driving rod 31.
1, a rotating lever 43 fixed to the roller shaft 24 and integrally rotating, the rotating lever 43 and the swing lever 4
A connecting rod that connects the long shaft portion to the first long hole portion, and a rotation angle of the roller shaft can be adjusted by changing a position where the connecting rod is connected to the long hole portion of the swing lever. It has a characteristic in the manner described above.

The frame 21 according to the third aspect of the invention is characterized in that the frame 21 is provided with a switching lever 51 for rotating the roller support 22 to hold the roller 26 away from the cloth.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

First, in FIG. 1, a sewing machine main body 11 has a well-known structure, and a needle 13 is supported by a needle bar 12 and moves up and down toward a table 14. On the other hand, the cloth presser 16 for holding the sewing cloth 15 is
It goes up and down in conjunction with the rise of. That is, the sewing cloth 15 is held down when the needle 13 is lowered, and the sewing cloth 15 is raised by about 1 mm when the needle 13 is raised, and is fed forward by a feed dog (not shown).

Next, the intermittent cloth feeder 20 will be described.

In this embodiment, the frame 21 is welded and integrated with the presser foot 16 and moves up and down integrally with the frame 21. The frame 21 is not limited to the above embodiment, but may be formed separately from the work clamp 16 and attached to the mounting rod 17.

The roller supports 22 are arranged on both sides of the frame 21, and the central portion is supported by a pin 23 so as to be swingable with respect to the frame 21. A roller shaft 24 is rotatably mounted at the lower end.

As shown in FIG. 2, a roller 26 is rotatably mounted on the roller shaft 24 via a one-way clutch 25.

The roller 26 rotates integrally with the roller shaft 24 when the roller shaft 24 rotates in the direction of arrow A,
When the roller shaft 24 rotates in the direction opposite to the arrow A, it stops.

A spring 27 is attached to the roller support 22 at the upper end opposite to the roller shaft 24 between the roller support 22 and the frame 21 and is always urged in the direction of arrow B. As a result, the roller 26 is pressed against the cloth 15 to be sewn.

The slot 2 formed in the roller support 22
8 restricts the rotation angle of the roller support 22 together with the pins 29 implanted in the frame 21.

The driving rod 31 is L-shaped, and has one end attached to the needle bar 12 and a sliding part 32 formed at the other end.

Next, the lever mechanism 40 will be described.

The lever mechanism 40 includes a swing lever 41
And a rotation lever 43 fixed to the roller shaft 24 by a pin 42 (see FIG. 2), and a connecting rod 44 connecting the rotation lever 43 and the swing lever 41.

The swing lever 41 has an elongated hole 45 formed at an intermediate portion, and one end 41a is rotatably attached to the frame 21. A long groove 46 is formed at the other end, and the sliding portion 32 of the driving rod 31 is inserted into the long groove 46.

The connecting rod 44 is connected by a screw 47 at an appropriate position of the long hole 45.

The switching lever 51 is rotatably mounted on the frame 21 and is urged by a spring 52. Then, when the roller 26 is rotated to the position shown by the chain line in FIG. 3, it collides with the roller support 22, rotates the roller support 22 in the direction indicated by the arrow B, and holds the roller 26 away from the cloth 15. In this case, the switching lever 51 is held in contact with a stopper (not shown).

Next, the operation of the cloth feed will be described.
This takes place during the rising period of the needle 13.

When the needle 13 is at the lowest position, the driving rod 3
The pivot lever 1 and the pivot lever 43 are located at positions shown by chain lines in FIG.

When the needle 13 rises, the sliding portion 32 of the drive rod 31 moves in the long groove 46, and the swing lever 41 rotates in the direction of arrow C. At the same time, the connecting rod 44 rises and rotates the rotating lever 43 in the direction of arrow A. Rotating lever 43
Is fixed to the roller shaft 24, so that the roller shaft 2
4 is also turned in the direction of arrow A, and at the same time, the roller 26 is also turned in the direction of arrow A. Since the roller 26 is pressed against the sewing cloth 15, the sewing cloth 15 is sent forward as the roller 26 rotates.

Further, the presser foot 1 is synchronized with the rising of the needle 13.
6 also rises. With this, the frame 21 rises (FIG. 1
), And the roller support 22 rises. As a result, a gap is generated between the roller 26 and the cloth 15 to be sewn, but the elasticity of the spring 27 causes the roller support 22 to change its inclination angle until the roller 26 comes into contact with the cloth 15 to be sewn. As a result, the roller shaft 24 and the roller 26 move to the position shown by the dashed line in FIG. 1, whereby the sewing cloth 15 is pushed forward by the same amount.

When the needle 13 descends, the swing lever 41 moves in the direction opposite to the above, and the rotation lever 43 and the roller shaft 24 rotate in the direction opposite to the arrow A. However, since the roller 26 does not rotate due to the action of the one-way clutch 25, the sewing cloth 15 is stopped at the same position.

Next, adjustment of the feed pitch of the sewn cloth 15 will be described.

If the connecting position of the connecting rod 44 is set at the left end of the elongated hole 45 as shown in FIG. 1, the moving distance of the connecting rod 44 becomes shorter, and the rotation angle of the rotating lever 43 becomes smaller.
The rotation angle of the roller 26 becomes smaller. That is, the feed pitch of the sewn cloth 15 becomes smaller.

On the other hand, if the connecting position of the connecting rod 44 is set to the right end of the elongated hole 45 as shown in FIG. 1, the moving distance of the connecting rod 44 becomes longer, so that the rotation angle of the roller 26 becomes larger and the feed of the sewing cloth 15 is performed. The pitch also increases.

In the case of a setup change, the switching lever 5
3, the roller support 22 rotates in the direction indicated by the arrow B, so that the roller 26 is attached to the sewing cloth 1.
5 is maintained.

According to the above embodiment, the following effects can be obtained. a) Since the roller 26 is rotated using the vertical movement of the needle 13 as a drive source to feed the sewn cloth 15, the structure can be significantly simplified, and a conventional servomotor and reduction gear are required. As a result, a significant cost reduction can be achieved. b) Roller support 22, roller shaft 24 and roller 2
Since the frame 6 is supported by the frame 21 which moves up and down integrally with the presser foot 16, the roller support 22 can be pushed forward when the presser foot 16 rises, and the feed pitch of the cloth 15 to be sewn can be increased. c) Since the connecting position between the swing lever 41 and the connecting rod 44 is adjustable, the rotation angle of the roller 26 and thus the feed pitch of the sewing cloth 15 can be adjusted. d) Since the switching lever 51 is provided on the frame 21, the roller 26 can be held in a state separated from the sewing cloth 15 with a simple configuration, which is convenient at the time of setup change.

[0034]

According to a first aspect of the present invention, there is provided a frame which moves up and down integrally with a presser foot, a roller support which is swingably attached to the frame and has a roller shaft rotatably mounted at the lower end thereof, and A roller which is rotatably attached to the supporting roller shaft via a one-way clutch and is pressed against the cloth;
A drive rod attached to a needle bar for holding a needle; and a lever mechanism attached to the frame and driven by the drive rod to rotate a roller shaft of the roller support, wherein the lever moves when the needle is raised. Since the roller is rotated in the cloth feeding direction via a mechanism and the roller presser and the roller shaft are pushed out in the cloth feeding direction when the cloth presser is raised, the structure can be significantly simplified and the cost can be reduced. This has the effect that downing can be achieved.

According to a second aspect of the present invention, the lever mechanism has a long hole in an intermediate portion, one end of which is rotatably mounted on the frame and the other end of which is driven by a driving rod, and a lever shaft. Since it is provided with a rotating lever that is fixed and rotates integrally, and a connecting rod that connects the rotating lever and the long hole of the swing lever, the connecting rod is connected to the long hole of the swing lever. By changing the connecting position, the rotation angle of the roller shaft can be adjusted.

According to the third aspect of the present invention, since the frame is provided with a switching lever for rotating the roller support to hold the roller away from the cloth, it is very convenient for changing the setup. To play.

[Brief description of the drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a partially cutaway plan view showing a relationship between a roller shaft and a roller.

FIG. 3 is a front view showing a state in which a switching lever is operated.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 11 sewing machine 12 needle bar 13 needle 14 table 15 cloth (sewn cloth) 16 cloth holder 17 mounting rod 21 frame 22 roller support 24 roller shaft 25 one-way clutch 26 roller 27 spring 31 drive rod 40 lever mechanism 41 swing lever 43 times Moving lever 44 Connecting rod 45 Slot 51 Switching lever

Claims (3)

[Claims] A frame which moves up and down integrally with the presser foot, a roller support rotatably mounted on the frame and having a roller shaft rotatably mounted at a lower end thereof, and a roller shaft of the roller support in one direction. A roller rotatably mounted via a clutch and pressed against the cloth; a driving rod attached to a needle bar holding a needle; a roller mounted on the frame and driven by the driving rod to support the roller. A lever mechanism for rotating a shaft, wherein when the needle is raised, the roller is rotated in the cloth feeding direction via the lever mechanism, and when the cloth presser is raised, the roller shaft and the roller are moved in the cloth feeding direction. An intermittent cloth feeder for a sewing machine, characterized in that it is pushed out. A lever mechanism having an elongated hole at an intermediate portion, one end rotatably mounted on the frame, and the other end driven by a driving rod; A rotating lever that rotates, and a connecting rod that connects the rotating lever and the long hole of the rocking lever, and changes a position where the connecting rod is connected to the long hole of the rocking lever. 2. The intermittent cloth feeding device according to claim 1, wherein the rotation angle of the roller shaft can be adjusted. 3. The intermittent cloth feeder according to claim 1, wherein the frame includes a switching lever for rotating the roller support to hold the roller away from the cloth.