JP4039977B2 - Sewing machine cloth feed drive - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a cloth feed driving device applied to a looper inline type sewing machine or the like.
[0002]
[Prior art]
In a conventional sewing machine feed driving device, a chain and a sprocket are used as a connecting member for connecting the second drive shaft and the drive roller (see, for example, Patent Document 1). The second drive shaft was installed on the back surface of the cloth bed (sewing machine bed), and the drive roller was arranged so as to partially protrude from the upper surface of the machine bed.
[0003]
[Patent Document 1]
JP 2002-336567 A (right column on page 3, FIG. 4)
[0004]
[Problems to be solved by the invention]
However, in the conventional sewing machine feed driving device, since the connecting member is arranged outside the sewing machine bed, the noise generated during the driving is increased, and the operator is uncomfortable. In addition, since a chain and a sprocket are used as connecting members, the wear is severe and it is necessary to pay attention to the biting of the fabric. When a timing belt is used as a connecting member in order to avoid this problem, the timing belt expands and contracts in accordance with a change in driving, resulting in unevenness in roller feeding.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a feed driving device for a sewing machine that can reduce noise generated during driving and prevent biting of a fabric.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a lower shaft that is horizontally supported and fixed with a worm, a first drive shaft that fixes a worm wheel meshing with the worm, and a first drive shaft via a gear member. A second drive shaft coupled to the second drive shaft, a drive roller coupled to the second drive shaft via a coupling member and disposed on the sewing machine bed, and a driven roller disposed on the sewing machine bed and opposed to the drive roller. In a cloth feed driving device for a sewing machine that sometimes rotates a drive roller to apply a feed motion to a cloth on a sewing bed, the second drive shaft and the first drive shaft are arranged in parallel in the vertical direction and the gear member is the sewing bed. The connecting member is arranged in the upper part of the sewing machine bed.
[0006]
In addition, it is desirable that the connecting member is composed of two bevel gears arranged orthogonally, and the bevel gear on the drive roller side is detachable from above the sewing machine bed.
[0007]
[Action]
According to the present invention, since the second drive shaft and the first drive shaft are disposed in parallel in the vertical direction and the gear member is disposed in the sewing machine bed, noise generated during driving can be reduced. Further, since the connecting member is arranged at the upper part in the sewing machine bed, the rotation amount of the driving roller can be changed by exchanging the parts of the connecting member. Further, of the two bevel gears serving as connecting members, the bevel gear on the drive roller side can be attached and detached from above the sewing machine bed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing a main part of a feed driving device for a sewing machine applied to the present invention. A worm 2 is fixed to a lower shaft that is horizontally supported in the sewing machine bed 1. The lower shaft worm 2 meshes with a worm wheel 4 fixed to the first drive shaft 3. The first drive shaft 3 is supported in the sewing machine bed 1, and the support direction is vertical. The lower end of the first drive shaft 3 is provided with a spur gear 5a. The spur gear 5a meshes with a spur gear 5b fixed to the lower end of the second drive shaft 6, and the second drive shaft 6 extends in the vertical direction. That is, the first drive shaft 3 and the second drive shaft 6 are arranged in parallel in the sewing machine bed 1, and the two members 3 and 6 are connected by the gear member 5 composed of spur gears 5a and 5b. The number of teeth of the spur gear 5b is larger than that of the spur gear 5a.
[0009]
A bevel gear 7 a is attached to the upper end of the second drive shaft 6. The bevel gear 7a meshes with a bevel gear 7b fixed to the horizontal shaft 8 with a screw 9. That is, the bevel gears 7a and 7b are arranged orthogonally. The connecting member 7 including the bevel gears 7a and 7b is disposed in the upper part of the sewing machine bed 1. The bevel gear 7b can be detached from above the sewing machine bed 1 by shifting the horizontal shaft 8 when the screw 9 is loosened. It has become. The horizontal shaft 8 is fixed to the shaft core portion of the driving roller 10, and the driven roller 11 is disposed to face the driving roller 10. The driven roller 11 is rotatably supported by a sewing machine arm 12 extending from the sewing machine bed 1 via a bracket 13.
[0010]
During the sewing operation, the worm 2 gives a rotational motion to the first drive shaft 3 through the worm wheel 3 by the rotation of the lower shaft, and at this time, the first drive shaft 3 rotates at a lower speed than the lower shaft. The rotational motion of the first drive shaft 3 is decelerated via the gear member 5, and this reduced rotational motion is transmitted to the second drive shaft 6. The rotational motion transmitted to the second drive shaft 6 is decelerated via the connecting member 7, and this reduced rotational motion is transmitted to the drive roller 10. That is, decelerating motion transmission from the lower shaft to the drive roller 10 is performed in three stages. The cloth placed on the sewing machine bed 1 is conveyed in the cloth feeding direction F by the rotational movement of the driving roller 10 while being sandwiched between the driving roller 10 and the driven roller 11.
[0011]
Although not described in detail in the present embodiment, when the bevel gear 7a and the bevel gear 7b are interchanged and assembled, the rotation amount of the drive roller 10 is changed. Further, when the fabric is conveyed using the continuously rotating driving roller as in the present embodiment, the feed dog that elliptically moves in four directions along the cloth feeding direction can be omitted, and as a result, the swinging motion is caused. Vibration can also be reduced. Furthermore, in this embodiment, since the connection from the lower shaft to the drive roller is performed in three stages by meshing with a gear or the like, the overslow phenomenon of the drive roller due to the rotation change of the lower shaft is prevented. Can do.
[0012]
【The invention's effect】
As described above, according to the present invention, noise generated during driving is reduced, so that no discomfort is given to the operator. Further, since the gear member for connecting the second drive shaft and the first drive shaft is disposed in the sewing machine bed, the cloth can be prevented from being bitten and the durability can be improved. Furthermore, since the amount of rotation of the drive roller can be changed by exchanging the parts of the connecting member from above the sewing bed, it is possible to respond quickly to changes in the sewing specifications.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a main part of a feed driving device for a sewing machine applied to the present invention.
FIG. 2 is a front view showing a main part in the sewing machine bed of the sewing machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sewing machine bed 2 Worm 3 1st drive shaft 4 Worm wheel 5 Gear member 6 2nd drive shaft 7 Connecting member 7a, 7b Bevel gear 10 Drive roller 11 Followed roller

Claims (2)

A lower shaft supported horizontally and fixed with a worm, a first drive shaft fixed with a worm wheel meshing with the worm, a second drive shaft connected to the first drive shaft via a gear member, and a connecting member A drive roller connected to the second drive shaft and disposed on the sewing bed, and a driven roller disposed on the sewing bed so as to face the drive roller, and the drive roller is rotated to drive the cloth on the sewing bed when the sewing machine is driven. In a cloth feed drive device for a sewing machine that imparts a feed motion, the second drive shaft and the first drive shaft are arranged in parallel in the vertical direction, the gear member is arranged in the machine bed, and the connecting member is an upper part in the machine bed. A cloth feed driving device for a sewing machine, characterized in that it is arranged on the sewing machine. The sewing machine cloth feed driving device according to claim 1, wherein the connecting member is composed of two bevel gears arranged orthogonally, and the bevel gear on the drive roller side is detachable from above the sewing machine bed.

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