JP4343395B2 - Sewing machine drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a driving device for a sewing machine.
[0002]
[Prior art]
FIG. 5 is a view of a conventional sewing machine feed driving device viewed from the bottom side of the sewing machine. The upper shaft 2 is rotated by driving a sewing machine motor (not shown) to move the needle bar up and down via a driving mechanism (not shown). Reference numeral 4 denotes a vertical feed shaft that imparts vertical movement to a feed dog (not shown). Reference numeral 6 denotes a horizontal feed shaft, which imparts horizontal movement to the feed dog. A hook shaft 8 rotates a hook (not shown) in synchronization with the needle bar.
[0003]
Sprockets 14 and 16 are fixed to the upper shaft 2 and the vertical feed shaft 4 by set screws 10 and 12, respectively, and the rotation of the upper shaft 2 is transmitted to the vertical feed shaft 4 via a timing belt 18 that meshes with these two sprockets. The The vertical feed shaft 4 is rotatably supported by a bearing 22 attached to the frame 20.
[0004]
A horizontal feed cam 24 is fixed to the vertical feed shaft 4 by a set screw 26, and further, a vertical feed cam is fixed to the front end (not shown) by a set screw. The horizontal feed cam 24 drives the horizontal feed shaft 6 via a rod 28, a feed adjuster 30 and a feed arm 32. A gear 34 is fixed to the vertical feed shaft 4 by a set screw 36, and the shuttle shaft 8 is rotated by a gear 38 meshing with the gear 34. A thread trimming cam and a hook (not shown) are fixed to the hook shaft 8 with a set screw.
[0005]
With the above configuration, the rotation of the upper shaft 2 is transmitted to a needle bar, a vertical feed shaft 4, a horizontal feed shaft 6, and a shuttle shaft 8 (not shown).
[0006]
Each of the components such as the gears 34, 38, the horizontal feed cam 24, and the feed adjuster 30 has a sliding portion that performs high-speed motion, and therefore needs to be lubricated. Therefore, a sealed space 40 surrounded by the frames 20, 20 </ b> A, 20 </ b> B and a bottom cover (not shown) is formed, and each component and lubricating oil are accommodated in the sealed space 40.
[0007]
[Problems to be solved by the invention]
As is well known, the sewing machine is configured such that if the movement of the needle is used as a reference, the shuttle, the feed, and the thread trimmer cam move at a predetermined timing. However, when the sewing conditions change, only the timing of the feed movement may be changed with respect to the needle movement. At this time, it is often better not to change the timing of the hook or the thread trimmer cam. is there. However, in the configuration of the conventional drive device, the feed screw timing is changed by loosening the set screw 12 of the sprocket 16 and shifting the relative position between the vertical feed shaft 4 and the sprocket 16. The timing of the hook shaft 8 connected to the shaft 4 is also shifted at the same time. For this reason, it has been necessary to readjust the timing of the hook and thread trimming cam fixed to the hook shaft 8 to the original state.
[0008]
As another method of shifting the feed timing with respect to the needle, the set screw 26 of the horizontal feed cam 24 and the set screw of the vertical feed cam (not shown) can be loosened and shifted. Since the horizontal feed cam 24 is housed in the sealed space 40 for lubrication as described above, in order to loosen the set screw 26, the bottom cover is removed. Work is necessary, and the timing cannot be easily shifted.
[0009]
Accordingly, an object of the present invention is to provide a sewing machine drive device that can change only the feed timing while the timing of the needle and the shuttle remains constant.
[0010]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, an upper shaft that rotates by driving a sewing machine motor to move the needle bar up and down, a vertical feed shaft that imparts vertical motion to the feed dog, and a horizontal feed shaft A horizontal feed shaft that imparts motion in a direction, first connecting means that connects the vertical feed shaft and the horizontal feed shaft, a shuttle shaft that rotates the shuttle in synchronization with the needle bar, and the vertical feed shaft. A transmission means for transmitting the rotation of the upper shaft to the vertical feed shaft, a second connection means for connecting the transmission member and the hook shaft, and connecting or blocking the transmission member and the vertical feed shaft. There is provided a driving device for a sewing machine comprising a coupling member that enables the sewing machine.
[0011]
For example, the transmission means includes a hollow shaft in which an upper and lower feed shaft is loosely fitted to an inner peripheral portion, a hollow shaft capable of connecting the shuttle shaft to an outer peripheral portion, one end fixed to the hollow shaft, and the other end by the coupling member. And a sprocket interlocked with the vertical feed shaft.
[0012]
Alternatively, the transmission means inserts a vertical feed shaft into the inner peripheral portion, and a hollow shaft capable of connecting the shuttle shaft to the outer peripheral portion, one end being integrally connected to the hollow shaft, and the other end being the coupling A sprocket connected to the vertical feed shaft by a member can also be used.
Preferably, the coupling member is disposed outside a sealed lubrication chamber.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of a sewing machine driving apparatus according to the present invention will be described below with reference to FIGS. This drive device is different from the conventional drive device of the sewing machine in that the shape of the sprocket 50 constituting the transmission member attached to the vertical feed shaft 4 and the transmission means between the sprocket 50 and the vertical feed shaft 4 are different. This is that the hollow shaft 52 is provided, and the arrangement of the gears (second connecting means) 34 and 38 that connect the vertical feed shaft 4 and the shuttle shaft 8 is different.
[0014]
First, the parts denoted by the same reference numerals as those in FIG. 5 are the same or equivalent parts as in the conventional example. Therefore, the upper shaft 2 moves the needle bar up and down by driving a sewing machine motor (not shown). . The vertical feed shaft 4 imparts vertical movement to a feed dog (not shown). The horizontal feed shaft 6 imparts horizontal movement to the feed dog. The shuttle shaft 8 rotates the shuttle in synchronization with the needle bar. The rod 28 and the feed arm 32 connect the vertical feed shaft 4 and the horizontal feed shaft 6. Sprockets 14 and 16 are fixed to the upper shaft 2 and the vertical feed shaft 4, respectively, and the rotation of the upper shaft 2 can be transmitted to the vertical feed shaft 4 by a timing belt 18. The spreadets 14 and 16 and the timing belt 18 constitute a first connecting means. The rotation of the vertical feed shaft 4 is transmitted to the shuttle shaft 8 by gears 34 and 38. A thread trimming cam and a hook (not shown) are fixed to the hook shaft 8 with a set screw. Lubricating oil is housed in a sealed lubrication chamber 40 surrounded and sealed by the frames 20, 20A, 20B and a bottom cover (not shown), and each component such as gears 34, 38, horizontal feed cam 24, feed adjuster 30 and the like. Is stored.
[0015]
Next, the features of the present embodiment will be described. The sprocket 50 is formed with a hole 50A into which the hollow shaft 52 is inserted, and a hole 50B with a diameter smaller than the hole 50A and into which the vertical feed shaft 4 is inserted. The screw holes 54A and 56A for the set screws 54 and 56 are formed in the respective hole portions. The inner diameter of the hollow shaft 52 is slightly larger than the outer diameter of the vertical feed shaft 4, and the vertical feed shaft 4 can be smoothly rotated by loosely fitting the vertical feed shaft 4.
[0016]
The sprocket 50 is fixed to the hollow shaft 52 by a set screw 54, and the gear 34 that meshes with the gear 38 is fixed to the outer peripheral portion 52 </ b> B of the hollow shaft 52 by a set screw 64. The sprocket 50 is fixed to the vertical feed shaft 4 by a set screw 56 constituting a coupling member. Similarly to the conventional example, a horizontal feed cam 24 is fixed to the vertical feed shaft 4 by a set screw 26, and further, a vertical feed cam is fixed to the front end side (not shown) by a set screw.
[0017]
Of the four set screws 26, 54, 56, 64, the set screw 56 for fixing the sprocket 50 and the vertical feed shaft 4 and the set screw 54 for fixing the sprocket 50 and the hollow shaft 52 are the lubricating chamber 40. The other set screws 26 and 64 are arranged inside the lubrication chamber 40.
[0018]
In the above configuration, when only the feed movement timing is changed with respect to the needle movement, the set screw 56 fixing the sprocket 50 and the vertical feed shaft 4 is loosened, and the vertical feed shaft 4 is moved relative to the sprocket 50. What is necessary is just to fix after shifting a necessary amount to a rotation direction. At this time, since the sprocket 50 and the hollow shaft 52 are fixed by the set screw 54, the timing of rotation of the shuttle shaft 8 through the gear 34 fixed to the hollow shaft 52 by the set screw 64 is not changed. Therefore, it is not necessary to readjust the timing of the thread trimmer cam fixed to the hook shaft 8 or the hook, and the work can be greatly shortened. If the timing of the hook is slightly deviated from the predetermined timing, the sewing quality is affected. However, since it is not necessary to perform the adjustment again, the state before the change work can be reliably maintained.
[0019]
If it is necessary to change the timing of the hook and thread trimming with respect to the movement of the needle bar, the set screw 54 is loosened, the hollow shaft 52 is shifted in the rotational direction by a necessary amount, and then fixed again.
[0020]
Next, a second embodiment of the sewing machine driving apparatus according to the present invention will be described with reference to FIGS. This drive device is different from the first embodiment in that a hollow member 60C corresponding to the hollow shaft 52 in FIG. 1 is formed integrally with a sprocket 60 attached to the vertical feed shaft 4 and the first embodiment. Since the set screw 54 for fixing the hollow shaft 52 of the embodiment is not necessary, only one set screw hole 62A is formed, and the other points are the same. The vertical feed shaft 4 is inserted into the inner peripheral portion 60A of the sprocket 60 and fixed by a set screw 62 through a hole 62A, and the gear 34 is fixed to the outer peripheral portion 60B by a set screw 64 constituting a coupling member. .
[0021]
In the present embodiment, of the three set screws 26, 62, 64, the set screw 62 that fixes the sprocket 50 and the vertical feed shaft 4 is disposed outside the lubrication chamber 40, and the other set screws 26, 64 is disposed inside the lubrication chamber 40.
[0022]
In the above configuration, when only the feed movement timing is changed with respect to the needle movement, the set screw 62 fixing the vertical feed shaft 4 to the sprocket 60 is loosened, and the vertical feed shaft 4 is moved relative to the sprocket 60. What is necessary is just to fix after shifting a necessary amount to a rotation direction. At this time, since the sprocket 60 and the gear 34 remain fixed by the set screw 64, the timing of the rotation of the shuttle shaft 8 through the gear 34 is not changed. Therefore, as in the case of the first embodiment, there is no need to readjust the timing of the thread trimming cam fixed to the hook shaft 8 or the hook, and the work can be greatly shortened. If the timing of the hook is slightly deviated from the predetermined timing, the sewing quality is affected. Therefore, it is not necessary to re-adjust the hook, so that the state before the change work can be reliably maintained.
[0023]
In the case of this embodiment, there is an advantage that the number of parts is smaller than that in the case of the first embodiment. In this embodiment, when changing the timing of the hook and thread trimming with respect to the movement of the needle bar, the set screw 64 in the lubrication chamber 40 is loosened and the gear 34 is shifted in the rotational direction by a necessary amount. Although it needs to be fixed and takes time, there is almost no change in the timing of the hook and the thread trimmer at the same time with respect to the needle, so there is no substantial disadvantage.
[0024]
As mentioned above, although this invention was demonstrated based on embodiment shown in drawing, this invention is not limited to these embodiment, A various deformation | transformation is possible.
[0025]
【The invention's effect】
A sewing machine drive device according to the present invention includes a first connecting member that connects a vertical feed shaft and a horizontal feed shaft, a shuttle shaft that rotates the shuttle in synchronization with the needle bar, and a transmission member provided on the vertical feed shaft. A transmission means for transmitting the rotation of the upper shaft to the vertical feed shaft; a second connection member for connecting the transmission member and the shuttle shaft; a coupling member capable of connecting or blocking the transmission member and the vertical feed shaft; It has.
[0026]
In this way, by providing the coupling member independently of the second coupling member, the transmission member and the vertical feed shaft are coupled by the coupling member while maintaining the interlocking between the transmission member and the hook shaft by the second coupling member. Or it became possible to shut off. When only the timing of the feed movement is changed with respect to the needle movement, the fixing with the vertical feed shaft is released by the coupling member, and the vertical feed shaft is shifted and fixed in the rotational direction by a necessary amount. At this time, since the vertical feed shaft and the gear remain integral, the timing of rotation of the shuttle shaft through this gear is not changed. Therefore, it is not necessary to readjust the timing of the thread trimming cam fixed to the hook shaft and the hook, and the work can be greatly shortened. Further, if the hook timing is slightly deviated from the predetermined timing, the sewing quality is affected. Therefore, it is not necessary to perform the adjustment again, so that the state before the change operation can be reliably maintained.
[0027]
When the coupling member is provided outside the sealed lubrication chamber, workability is greatly improved because it is not necessary to open the sealed lubrication chamber in order to release the fixation with the vertical feed shaft by the coupling member. Is done.
[Brief description of the drawings]
FIG. 1 is a bottom view of a first embodiment of a sewing machine driving device according to the present invention;
FIG. 2 is a perspective view of a sprocket and a hollow shaft according to the first embodiment.
FIG. 3 is a bottom view of a second embodiment of the sewing machine driving device according to the present invention;
FIG. 4 is a perspective view of a sprocket configured integrally with a hollow shaft according to a second embodiment.
FIG. 5 is a bottom view of a conventional sewing machine driving apparatus.
[Explanation of symbols]
2 ... Upper shaft 4 ... Vertical feed shaft 6 ... Horizontal feed shaft 8 ... Hook shaft 14, 18, 50, 52, 60 ... Transmission member 28, 32 ... First connecting member 34, 38, 64 ... second connecting member 40 ... lubrication chamber 52, 60C ... hollow member 56, 62 ... coupling member

Claims (4)

An upper shaft that rotates by driving the sewing machine motor to move the needle bar up and down;
A vertical feed shaft that imparts vertical motion to the feed dog;
A horizontal feed shaft that imparts horizontal movement to the feed dog;
First connecting means for connecting the vertical feed shaft and the horizontal feed shaft;
A hook shaft that rotates the hook synchronously with the needle bar,
A transmission means having a transmission member provided on the vertical feed shaft, and transmitting the rotation of the upper shaft to the vertical feed shaft;
Second connection means for connecting the transmission member and the shuttle shaft;
A coupling member capable of connecting or blocking the transmission member and the vertical feed shaft;
A sewing machine drive device comprising: The sewing machine driving device according to claim 1,
The transmission means includes
A hollow shaft capable of loosely fitting the vertical feed shaft to the inner peripheral portion and connecting the shuttle shaft to the outer peripheral portion;
An apparatus for driving a sewing machine, characterized in that one end is fixed to the hollow shaft and the other end is a sprocket linked to the vertical feed shaft by the coupling member. The sewing machine driving device according to claim 1,
The transmission means includes
A hollow shaft capable of connecting the shuttle shaft to the outer peripheral portion, while inserting a vertical feed shaft into the inner peripheral portion,
A sewing machine driving device comprising: a sprocket having one end integrally connected to the hollow shaft and the other end coupled to the vertical feed shaft by the coupling member. The sewing machine drive device according to claim 1, 2 or 3,
The drive device for a sewing machine, wherein the coupling member is disposed outside a sealed lubrication chamber.

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