JPH0420371A - Walking bar device for sewing machine - Google Patents

Abstract

PURPOSE:To easily execute the control of the momentus in the vertical direction by providing a long groove which extends to a connecting part and a screw is inserted through on a vertical driving body. CONSTITUTION:A vertical driving body 38 is fixed to a vertical shaft 35 with a screw 54, and the vertical driving body 38 is provided with a long groove 55 which the screw 54 is inserted through. At the time of controlling the reciprocating momentus in the vertical direction of walking bar teeth 2, when the screw 54 is loosened first, a relative position of the vertical shaft 35 and the vertical driving body 38 can be moved along the long groove 55. Subsequently, by operating the vertical driving body 38, length of a square frame 41 being a connecting part and the vertical shaft 35 is controlled. Next, when the screw 54 is tightened again, the vertical shaft 35 and the vertical driving body 38 are fixed, and the control of the reciprocating momentum in the vertical direction of the walking bar teeth 2 is completed. In such a way, the control of the momentus in the vertical direction of the walking bar teeth 2 is executed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an upper feed device of a sewing machine that provides a feed motion to a workpiece cloth from above, and particularly relates to a four-movement feed device given to a feed dog. Of these, it relates to a mechanism that adjusts the amount of reciprocating motion in the vertical direction.

[Prior Art] In the conventional upper feed device of a sewing machine, the vertical momentum adjustment mechanism that adjusts the reciprocating momentum in the vertical direction among the four motion feeds is
It was installed inside the sewing machine.

When adjusting the amount of movement in the vertical direction, the case must be removed and the vertical movement adjustment mechanism inside the sewing machine must be operated.

Note that some sewing machine feed devices connect a lever external to the sewing machine and a vertical momentum adjustment mechanism via a link mechanism, and the vertical reciprocating momentum can be controlled from outside the case. Ta.

[Problems to be Solved by the Invention] However, the upper feed device of a sewing machine, which adjusts the amount of movement in the vertical direction by removing the case, is not only cumbersome to attach and detach the case, but also the interior of the sewing machine has become narrow due to the compactness of the sewing machine. Therefore, it was often difficult to operate the vertical momentum adjustment mechanism.

In addition, in the case where the vertical momentum adjustment mechanism installed inside the sewing machine is adjusted from outside the sewing machine via a link mechanism, the addition of the link mechanism not only increases the manufacturing cost of the sewing machine's upper feed device, but also increases the manufacturing cost of the sewing machine's upper feed device. The upper feeding device becomes larger and heavier.

The present invention has been made in view of the above circumstances, and its purpose is to easily adjust the amount of movement in the vertical direction and to reduce the manufacturing cost of an upper feed device of a sewing machine equipped with a mechanism for adjusting the amount of vertical movement. .

[Means for Solving the Problems] In order to achieve the above object, the upper feed device of the sewing machine of the present invention employs the following technical means.

The upper feed device of the sewing machine includes a horizontal drive body that performs a horizontal reciprocating motion in conjunction with the vertical and reciprocating motion of the sewing needle, and a horizontal drive body that is rotatably connected to the horizontal drive body and that moves above the workpiece cloth placed on the workpiece cloth support surface. an upper feed table to which an upper feed dog is fixed for transferring the work cloth; a rotatably supported transmission lever;
Along with the vertical reciprocating motion of the sewing needle, a vertical shaft is assisted at a predetermined rotation angle, and the vertical shaft rotates integrally with this vertical shaft, and the free end side is connected to the transmission lever via a connecting portion, and the vertical reciprocating motion of the sewing needle is rotated integrally with the vertical shaft. It includes a vertical drive body that reciprocates the free end side of the transmission lever up and down as the transmission lever moves, and a guide that is provided on the free end side of the transmission lever and supports the upper feed table so as to be movable in the horizontal direction. do.

The vertical drive body is arranged on the throat plate on which the work cloth is placed.

Further, the vertical drive body is fixed to the vertical shaft by tightening a screw.

Furthermore, the vertical drive body includes a long groove extending toward the connecting portion and into which the screw is inserted.

[Operation] By loosening the screw, the vertical drive body can move along the long groove. Here, the relative position of the vertical drive body and the vertical shaft, that is, the length of the connecting portion and the vertical shaft, is set arbitrarily.

Next, tighten the screw to fix the vertical drive body and the vertical shaft.

On the other hand, when the vertical shaft performs reciprocating rotational motion at a predetermined rotation angle, the length of the arc drawn by the connecting portion corresponds to the length of the connecting portion and the vertical shaft.

As a result, by adjusting the length of the connecting portion and the vertical shaft, the amount of vertical movement of the guide provided on the connecting lever is adjusted, and the amount of movement of the upper feed dog in the vertical direction is adjusted.

[Effect of the invention] The vertical drive body, together with the guide, transmission lever, and upper feed table,
Located near the upper feed dog. Further, in the present invention, the vertical drive body is provided above the throat plate.

As a result, the vertical drive body is arranged near the upper feed dog.

The area around the upper feed dog is usually exposed to the outside of the case.
By providing the vertical drive body in an exposed manner outside the case, the amount of movement of the upper feed dog in the vertical direction can be easily adjusted. In addition, since there is generally no complicated mechanism around the vertical drive body, even if the first drive body is placed inside the case, the vertical movement of the upper feed dog can be adjusted simply by removing the case. It can be done easily.

Further, the downward movement of the upper feed dog can be easily adjusted, but a link mechanism like the conventional one is not required. For this reason, the manufacturing cost of the upper feed device of the sewing machine is
It is possible to keep the cost low compared to those equipped with a link mechanism, and the upper feed device of the sewing machine can be made lighter and smaller.

[Embodiment 1] Next, an upper feed device of a sewing machine according to the present invention will be explained based on an embodiment shown in the drawings.

(Configuration of Embodiment) FIGS. 1 to 4 show an embodiment of the present invention, and FIGS. 1 and 2 are side views showing a link mechanism that drives the upper feed dog.

b) General explanation of the upper feed device W1 of the sewing machine.

The upper feed device 1 of the sewing machine includes a horizontal drive mechanism 3 for giving horizontal reciprocating motion to the upper feed dog 2, a horizontal feed momentum adjustment mechanism 4 for adjusting the horizontal movement of the upper feed dog 2, and an upper feed It includes a vertical drive machine [5] for giving reciprocating motion in the vertical direction to the teeth 2, and a vertical feed momentum adjustment mechanism 6 for adjusting the downward momentum of the upper feed dog 2.

Mouth) Explanation of the horizontal drive machine Wi3.

An eccentric wheel 8 is fixed to a drive shaft 7 that rotates in one direction, and a swing motion is transmitted to a horizontal feed shaft 11 via a feed rod 9 and a horizontal feed arm 10. A horizontal feed adjusting arm 14 is fixed to the end of the horizontal feed shaft 1. The horizontal feed adjusting arm 14 has a square piece 13 fitted into a lever 12 having a U-shaped cross section. In corner piece 13,
One end of the horizontal feed link 15 is fitted. The other end of the horizontal feed link 15 is connected by a pin 18 to a horizontal shaft arm 17 fixed to a horizontal shaft 16, and transmits the swinging motion of the horizontal feed adjustment arm 14 to the horizontal shaft 16.

The end of the horizontal shaft 16 is provided with one horizontal drive body extending downward, and the tip of the horizontal drive body 19 is rotatably connected to one end of the upper feed table 20. As a result, the upper feed table 20
Along with the reciprocating movement of the sewing needle 21 in the vertical direction, a reciprocating movement in the horizontal direction is transmitted to the sewing needle 21 .

c) Explanation of the horizontal feed momentum regulator wI4.

One end of the horizontal feed link 15 of the horizontal drive mechanism 3 (square piece 13
One end of the horizontal feed adjustment link 22 is fitted into the side (side). The other end of this horizontal feed adjustment link 22 is connected to one end of a first horizontal feed adjustment lever 23. This first
The other end of the horizontal feed adjustment lever 23 is fixed to one end of a second horizontal feed adjustment lever 25 via a rotatably supported pin 24. The other end of the second horizontal feed adjustment lever 25 protrudes from the outside of the frame 27 that houses each internal mechanism, and the horizontal feed scale plate 28 is fixed to the frame 27.
is fixed by a thumbscrew 29.

As a result, by loosening the thumbscrew 29 and moving the other end of the second horizontal feed adjustment lever 25 on the horizontal feed scale plate 28, the square piece 13 is moved along the groove 12, and the square piece 13 is moved along the groove 12. The length between the axis and the axis of the horizontal feed shaft 11 changes ゛C5
The amount of horizontal reciprocating motion transmitted to the upper feed table 20 is adjusted.

2) Description of the subordinate drive mechanism 5.

The upper knife shaft 30 performs a rocking motion in conjunction with the drive shaft 7
The vertical feed arm 33 is fixed to. The vertical feed arm 33 has
One end of the vertical feed link 34 is connected by a pin 32. The other end of the vertical feed link 34 is connected by a pin 37 to a vertical shaft arm 36 fixed to the vertical shaft 35, and transmits the swinging motion of the vertical shaft arm 33 to the lower shaft 35.

At the end of the vertical shaft 35, there is a vertical drive body 3 extending in the horizontal direction.
8 is fixed. On the free end side of this vertical drive body 38, a bifurcated portion 40 provided on the free end side of the three transmission levers is provided.
A square piece 41 (connecting portion of the present invention) that transmits reciprocating motion in the vertical direction is fitted into the frame. As a result, as the sewing needle 21 reciprocates up and down, the bifurcated portion 4o of the transmission lever 39 reciprocates in the up and down direction by the square piece 41. Note that the vertical drive body 38 is arranged above the throat plate on which the work cloth is placed.

The transmission lever 39 is rotatably supported by a support portion 43 on the free end side of an upper feed support arm 42, which will be described later.

Further, the transmission lever 39 rotatably supports the guide 44 between the support portion 43 and the square piece 41. Guide 44
is equipped with an arm 45 having a cross-sectional shape. The center portion of the upper feed table 20 is fitted into this groove 45, and supports the upper feed table 20 so as to be movable in the horizontal direction. And this guide 44
transmits the reciprocating motion in the vertical direction to the upper feed table 20 in accordance with the reciprocating motion in the vertical direction of the sewing needle 21.

At the tip of the upper feed table 20, a
An upper feed dog 2 for feeding the work cloth is fixed by a screw 46. The upper feed table 20 is driven horizontally and vertically by the above-described horizontal drive mechanism 3 and vertical drive mechanism 5 to give the upper feed dog 2 an elliptical feed motion (so-called four-movement feed).

On the other hand, the upper feed support arm 42 is rotatably supported around a presser arm shaft 48 via a metal 47. This upper feed support arm 42 is provided with a stopper 49 that extends upward. This stopper 49 is connected to the support portion 43 of the upper feed support arm 42.
When the support part 43 rotates downward, it hits the frame 27 and restricts the lower end position of the support part 43. In the upper feed support arm 42, when the support part 43 rotates in one direction, the transmission lever 39 rotates around the square piece 41, and the guide 4
4 is lifted in the upward direction, and the upper feed dog 2 rises together with the upper feed table 20.

Further, the guide 44 is directly urged toward the work cloth by the urging means 50. The biasing means 50 biases the guide 44 downward to prevent the position of the support portion 43 from moving in the vertical direction even if the square piece 41 moves vertically at high speed. It urges the feed support arm 42 downward.

Specifically, it is composed of a presser bar 51 that applies a biasing force to the guide, a presser foot adjustment screw 52 that adjusts the biasing force, and a main compression coil spring 53 that is disposed between the presser rod 51 and the presser foot adjustment screw 52. Ru.

e) The vertical feed momentum adjustment mechanism 6 will be explained using FIGS. 3 and 4.

The first main driver 38 is fixed to the vertical shaft 35 by a screw 54, and the vertical driver 38 includes a long groove 55 into which the screw 54 is inserted. The long groove 55 extends toward the square piece 41 attached to one end and the other end.

In addition, in the insertion direction of the screw 54, the installation of the screw 54,
The frame 27 is exposed outside the frame 27 so that there are no members (including the frame 27) that would interfere with the operation of a screwdriver (not shown) that rotates the screw 54.

(Operation of Example) Next, the operation of the vertical feed momentum adjustment mechanism 6 according to the present invention will be briefly described.

When adjusting the amount of reciprocating motion of the upper feed dog 2 in the vertical direction, first loosen the screw 54. Then, the relative position between the vertical shaft 35 and the vertical drive body 38 is changed to ? It becomes possible to move along ll55. Next, operate the lower drive body 38,
The length of the square piece 41, which is a connecting part, and the vertical shaft 35 is adjusted. Then, tighten the screw 54 again. When the screw 54 is tightened, the vertical shaft 35 and the vertical drive body 38 are fixed.
The adjustment of the vertical reciprocating motion of the upper feed dog 2 is completed.

That is, when the vertical shaft 35 performs a reciprocating rotational movement at a predetermined rotation angle, the length of the arc drawn by the square piece 41 corresponds to the length of each piece 41 and the vertical shaft 35.

As a result, by adjusting the length of each piece 41 and the vertical shaft 35, the vertical movement of the guide 44 provided on the transmission lever 39 is adjusted, and the vertical movement of the upper feed dog 2 is adjusted. Ru.

(Effects of the Example) As explained above, since the screw 54 is provided at a position where it can be directly rotated with a screwdriver, the vertical momentum of the upper feed fi2 can be easily adjusted. It can be carried out.

Further, the upper feed device N1 of the sewing machine of this embodiment has an upper feed dog 2.
The amount of movement in the vertical direction can be easily adjusted, but the conventional link 1a structure is not required. Therefore, compared to the conventional upper feed device in which the vertical feed momentum adjustment mechanism is operated using a link mechanism, the manufacturing cost can be kept low, and it is possible to reduce the weight and size.

The present invention can be modified in various ways without departing from the gist thereof.

[Brief explanation of the drawing]

Figures 1 and 2 are side views showing the link mechanism that drives the upper feed dog, Figure 3 is a side view of the main part of the vertical feed momentum adjustment mechanism, and Figure 4 is a view of the vertical drive body and the -L lower shaft. FIG. In the diagram 1.2 Feeding device of the sewing machine

Claims (1)

[Scope of Claims] 1) (a) A horizontal drive body that performs a horizontal reciprocating motion in accordance with the up and down reciprocation of the sewing needle; (b) A horizontal drive body rotatably connected to the horizontal drive body and mounted on a work cloth support surface. An upper feed table to which an upper feed dog is fixed for transferring the work cloth from above the placed work cloth, (c) a rotatably supported transmission lever, and (d) a reciprocating movement of the sewing needle up and down. (e) a vertical shaft that is assisted at a predetermined rotation angle; a vertical drive body (f) for vertically reciprocating the free end side of the transmission lever; and a guide provided on the free end side of the transmission lever for movably supporting the upper feed base in the horizontal direction; (e-1) the vertical drive body is arranged on the throat plate on which the work cloth is placed; (e-2) the vertical drive body is fixed to the vertical shaft by tightening a screw; (e-3) The upper feed device of a sewing machine, wherein the vertical drive body includes a long groove extending toward the connecting portion and into which the screw is inserted.