JPS598686Y2 - Sewing machine feed adjustment device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a feed adjustment device for a sewing machine, and in particular to a device that changes the amount of forward and backward feed by changing the position of an adjusting body with respect to the lower shaft.

An embodiment of this invention will be described with reference to drawings. In conjunction with a drive source, a lower shaft 1 rotating within the sewing machine bed is placed on the right end surface of a support base 2 at a position upwardly away from the central axis and parallel to the central axis. Fit into the provided fitting holes (not shown) and screw in the round screws 3 and 4 from two directions on the outer circumferential surface as shown in Fig. 3.
Fix the support stand 2 to the lower shaft.

A recess 5 is provided on the outer peripheral surface of the support base 2, and a screw hole 6 is formed in the bottom surface in a direction perpendicular to the central axis, and a guide groove 7 extending in the diametrical direction passing through the axis is formed in the left end surface. A notch hole 8 is provided in a direction perpendicular to the hole 6 and a part of the guide groove 7 communicates with a part of the bottom surface of the frame 5 of the support base 2, and the bottom surface of the notch part 9 on the outer peripheral surface. for. A long threaded hole 10 parallel to the guide groove 7 is formed.

In FIG. 3, a pin 12 parallel to the central axis is provided on the left end surface of the adjusting body 11 at a position above the central axis, and a hole 13 is formed in the lower part of the adjusting body 11. A fitting part 14 that loosely fits into the guide groove 7 is provided on the end face, and a corner part 14a of the fitting part 14 slightly protrudes from the notch hole 8 by the bottom surface of the recess 5, and a tooth part 14 is provided on the protruding part.
b.

When the large screw 16 passed through the washer 15 is screwed into the screw hole 6 of the recess 5 and tightened, the back surface of the washer 15 presses the corner 14a of the adjustment body 11, and the washer 15
The adjustment body 11 is fixed so as not to move up and down within the support base 2 due to the frictional resistance generated between the adjustment body 11 and the tooth portion 14b of the adjustment body 11.

As shown in FIG. 4, a U-shaped notch 17 is provided on the upper part of the fitting part 14 of the adjusting body 11, and the adjusting screw 1 is inserted into the notch 17.
A shaped flange 19 is fitted to the head of the adjustment screw 18, and a through hole 18a is provided in the threaded portion of the adjustment screw 18 in a direction perpendicular to the screwing direction, and a plastic plate is inserted into the hole 18a so as to protrude left and right. By loosely fitting the rod 23 and screwing the adjustment screw 18 into the long screw hole 10, the adjustment body 11 is attached to the support base 2.
By moving the adjustment body 11 downward in the guide groove 7 and loosening the adjustment screw 18, the adjustment body 11 is moved upward.

At this time, the plastic rod 23 is compressed into the adjustment screw, and both left and right ends of the plastic rod 23 press the wall surface of the long screw hole 10 with elastic force, and the adjustment screw 18 is securely fixed in the long screw hole 10. I'll do what I do.

When the adjusting screw 18 is screwed in and the adjusting body 11 is moved downward, the upper end of the hole 13 of the adjusting body 11 hits the upper end of the stopper 20 screwed into the bottom surface of the guide groove 7 of the support base 2 in the hole 13, and the adjusting body 11 is moved downward. The downward movement of is regulated, and
When the adjusting screw 18 is loosened and the adjusting body 11 is moved upward, the lower end of the hole 13 of the adjusting body 11 hits the lower end of the stopper 20, so that the upward movement of the adjusting body 11 is restricted.

As shown by the two-dot chain line in FIG. 1, one end of an arm shaft 22 connected to a feed rod 21 for providing forward and backward feeding is loosely fitted into the pin 12, and the arm shaft 22 is moved by rotation of the lower shaft 1. One end of the feed rod 21 connected thereto is moved up and down.

In the sewing machine feed adjustment device having the above structure, in order to increase the feed amount of the sewing machine, loosen the large screw 16, then loosen the adjustment screw 18, and move the adjustment body 11 to the position shown in FIG. When the adjustment body 11 moves upward from the position shown in FIG.

In this state, when the sewing machine is driven and the lower shaft 1 is rotated, one end of the feed rod 21 is rotated vertically in relation to the rotation of the lower shaft 1, but the pin 12 of the adjuster 11 is rotated vertically. Since it is separated from the central axis of the lower shaft 1 by the distance moved, the amount of rotation of the feed rod 21 increases, and thereby the amount of forward and backward feed increases.

To decrease the feed amount of the sewing machine, loosen the large screw 16, then screw the adjusting screw 18 into the long screw hole 10, move the adjusting body 11 downward, and when the adjusting body 11 is at the desired position, Stop turning the adjustment screw 18 and tighten the large screw 16.

When the sewing machine is driven in this state and the lower shaft 1 is rotated, one end of the feed rod 21 is rotated in the vertical direction, but the adjustment body 11
Since the pin 12 is closer to the central axis of the lower shaft 1 by the distance moved downward, the amount of rotation of the feed rod 21 is reduced, thereby reducing the amount of forward and backward feed.

As described above, this invention loosely fits the fitting part 14 of the adjustment body 11 into the guide groove 7 of the support base 2 that is fitted and fixed to the lower shaft 1, and the adjustment screw 18 that fits into the adjustment body 11. In a feed adjustment device for a sewing machine, which changes the forward and backward feed amount of cloth by moving a pin 12 protruding from one end surface of an adjustment body 11 closer to or away from the center axis of a lower shaft 1 by rotating forward and backward. , the elastic member 2 protrudes from the threaded portion of the adjustment screw 18.
3 and by screwing the adjustment screw 18 into the screw hole 10, the elastic member 23 presses the wall surface of the screw hole 10 and securely fixes the adjustment screw 18 in the screw hole 10. When the threaded part of the adjusting screw 18 is flat, the adjusting body 11 may not be able to move against the support base 2 due to play between the adjusting screw 18 and the screw hole 10 caused by machining errors during manufacturing or wear during use. It is very effective in eliminating the disadvantage of producing products with uneven seams due to small movements in the feed and quantity, and in producing products with beautiful, uniform seams and high commercial value.

Note that a rubber rod may be used instead of the plastic rod 23 in this embodiment. Also, in this embodiment, a through hole 18a is provided perpendicular to the threaded portion of the adjustment screw 18, and the hole 18a
Although the plastic rod 23 is loosely fitted in the above example, the same effect can be obtained by providing a recess on both sides of the threaded portion of the adjusting screw 18 and fitting the elastic member into the recess so as to protrude from the recess.

[Brief explanation of the drawing]

Fig. 1 is a perspective view with other parts omitted, Fig. 2 is a sectional view taken along line II-II in Fig. 1, Fig. 3 is an exploded perspective view, and Fig. 4 is a side view. be. In the figure, 1 is a lower shaft, 2 is a support base, 5 is a recess in the support base, 7 is a guide groove, 11 is an adjustment body, 12 is a pin, and 18 is an adjustment screw.

Claims (1)

[Claims for Utility Model Registration] It is fixed to the tip of a lower shaft that rotates in one direction, and has a guide groove 7 perpendicular to the central axis of the lower shaft on one end surface, or a tapped hole parallel to the guide groove in the middle part. an adjusting body 11 having a pin on one end surface that is parallel to the central axis of the lower shaft and protruding to the opposite side, and a fitting portion that loosely fits into the guide groove on the other end surface; A screw 16 that is screwed into the base and tightened to engage the adjustment body and fix the adjustment body to the support base; a feed rod 21 that connects one end to the pin and the other end to the cloth feeding mechanism; and one of the head parts. and an adjustment screw 18 whose part is loosely fitted into the adjustment body and whose threaded part is screwed into the screw hole of the support base, and when the adjustment screw is screwed into the screw hole, the end part elastically presses the wall surface of the screw hole. A feed adjustment device for a sewing machine, characterized in that an elastic body 23 is provided that protrudes from the threaded portion of the adjustment screw.