JP2004329397A - Cloth feeder driving device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cloth feeder driving device of a sewing machine which can reduce noise caused at the time of drive and preventing the bite of cloth. <P>SOLUTION: The cloth feeder driving device of the sewing machine is provided with a horizontally supported lower shaft to which a worm is fixed, a first drive shaft to which a worm wheel engaged with the worm is fixed, a second drive shaft connected to the first drive shaft through a gear member, a driving roller connected to the second drive shaft through a connection member and arranged on a sewing machine bed and a driven roller arranged opposing the driving roller on the sewing machine bed, and imparts feed movement to the cloth on the sewing machine bed by rotating the driving roller at the time of driving the sewing machine. The second drive shaft and the first drive shaft are arranged parallelly in a vertical direction, the gear member is arranged inside the sewing machine bed, and the connection member is arranged at an upper part inside the sewing machine bed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Industrial applications]
The present invention relates to a cloth feed drive device applied to a looper in-line sewing machine or the like.
[0002]
[Prior art]
In a conventional feed driving device of a sewing machine, a chain and a sprocket are used as a connecting member for connecting a second drive shaft and a drive roller (for example, see Patent Document 1). The second drive shaft was barely installed on the back of the cloth stand (sewing machine bed), and the drive roller was arranged so as to partially protrude from the upper surface of the sewing machine bed.
[0003]
[Patent Document 1]
JP 2002-336567 A (Page 3, right column, FIG. 4)
[0004]
[Problems to be solved by the invention]
However, in the conventional feed driving device for a sewing machine, since the connecting member is disposed outside the sewing machine bed, noise generated at the time of driving is increased, which gives an uncomfortable feeling to an operator. Further, since a chain and a sprocket are used as the connecting member, the wear is severe, and it is necessary to pay attention to the biting of the fabric. If a timing belt is used as a connecting member to avoid this problem, the timing belt expands and contracts in accordance with a change in driving, and uneven roller feeding occurs.
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 can prevent a fabric from getting stuck.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a lower shaft which is horizontally supported and has a worm fixed thereto, a first drive shaft which has a worm wheel engaged with the worm fixed, and a first drive shaft which has a gear member interposed therebetween. A second drive shaft connected to the second drive shaft, a drive roller connected to the second drive shaft via a connection member, and disposed on the sewing machine bed, and a driven roller disposed on the sewing machine bed so as to face the drive roller; A cloth feed drive device of a sewing machine for imparting a feed motion to a cloth on a sewing machine bed by occasionally rotating a drive roller, wherein a second drive shaft and a first drive shaft are arranged in parallel in a vertical direction and a gear member is provided on the machine bed. And the connecting member is arranged at the upper part in the sewing machine bed.
[0006]
It is desirable that the connecting member be constituted by two bevel gears arranged orthogonally, and that the bevel gear on the drive roller side be 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 arranged in parallel in the vertical direction and the gear member is arranged in the sewing machine bed, noise generated during driving can be reduced. In addition, since the connecting member is disposed at the upper portion in the sewing machine bed, the amount of rotation of the drive roller can be changed by exchanging parts of the connecting member. Further, of the two bevel gears serving as the connecting member, the bevel gear on the drive roller side can be detached from above the sewing machine bed.
[0008]
BEST MODE FOR CARRYING OUT 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 drive device of a sewing machine applied to the present invention. A worm 2 is fixed to a lower shaft horizontally supported in the sewing machine bed 1. The lower 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 its support direction is vertical. The lower end of the first drive shaft 3 has 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 connection between the two members 3, 6 is performed by the gear member 5 including the spur gears 5a, 5b. The spur gear 5b has more teeth than the spur gear 5a.
[0009]
A bevel gear 7a 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 composed of the bevel gears 7a and 7b is arranged at the upper part in the sewing machine bed 1. The bevel gear 7b can be detached from above the sewing machine bed 1 by moving the horizontal shaft 8 when the screw 9 is loosened. Has become. The horizontal shaft 8 is fixed to the shaft core of the driving roller 10, and the driven roller 11 is arranged to face the driving roller 10. The driven roller 11 is rotatably supported via a bracket 13 on a sewing machine arm 12 extending from the sewing machine bed 1.
[0010]
During the sewing operation, the rotation of the lower shaft causes the worm 2 to rotate the first drive shaft 3 via the worm wheel 3, and at this time, the first drive shaft 3 rotates at a reduced speed from the lower shaft. The rotational movement of the first drive shaft 3 is reduced via the gear member 5, and the reduced rotational movement is transmitted to the second drive shaft 6. The rotational movement transmitted to the second drive shaft 6 is reduced via the connecting member 7, and the reduced rotational movement is transmitted to the drive roller 10. That is, the 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 rotation of the driving roller 10 while being nipped 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 cloth is transported by using the continuously rotating drive roller as in the present embodiment, it is possible to omit the feed dogs that perform elliptical motion in four directions along the cloth feed direction, and as a result, the Vibration can also be reduced. Further, in the present embodiment, since the connection from the lower shaft to the drive roller is performed in three stages by meshing with gears or the like, it is possible to prevent the over throw phenomenon of the drive roller due to the rotation change of the lower shaft. Can be.
[0012]
【The invention's effect】
As described above, according to the present invention, since the noise generated during driving is reduced, the operator does not feel uncomfortable. In addition, since the gear member connecting the second drive shaft and the first drive shaft is arranged in the sewing machine bed, it is possible to prevent the fabric from getting stuck and to improve the durability. Furthermore, since the rotation amount of the drive roller can be changed by exchanging parts of the connecting member from above the sewing machine bed, it is possible to quickly respond to a change in sewing specifications.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a main part of a feed driving device of a sewing machine applied to the present invention.
FIG. 2 is a front view showing a main part in a sewing machine bed of the sewing machine.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 sewing machine bed 2 worm 3 first drive shaft 4 worm wheel 5 gear member 6 second drive shaft 7 connecting members 7a, 7b bevel gear 10 drive roller 11 driven roller

Claims (2)

A lower shaft fixed 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 via the second drive shaft and disposed on the sewing machine bed; and a driven roller disposed on the sewing machine bed so as to face the drive roller. In a cloth feed drive device of a sewing machine for giving a feed motion, a second drive shaft and a first drive shaft are arranged in parallel in a vertical direction, a gear member is arranged in a sewing machine bed, and a connecting member is located on an upper portion in the sewing machine bed. A cloth feed drive device for a sewing machine, wherein The cloth feed drive device for a sewing machine according to claim 1, wherein the connecting member comprises 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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