JPS6010752B2 - Stitch adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a stitch adjustment device that is locked during sewing machine operation and can be easily changed when changing stitches.

The present invention relates to an improvement of a stitch adjustment device that can release stitches. Conventionally, when sewing using a sewing machine, the number of stitches has been adjusted as appropriate depending on the sewing conditions such as the type of cloth.

However, it has been known that this type of conventional device has a drawback in that the stitch adjustment dial tends to rotate during operation due to its structure. As shown in FIG. 1, this type of follower device is constructed by screwing together a stitch adjustment screw 12 in the arm machine frame of a sewing machine.

One end of this adjustment screw 12 is formed with a contact saddle portion 14 that comes into contact with a cam surface (not shown) for stitch adjustment, and the other end is provided with a stitch adjustment dial located outside the arm machine frame 10 of the sewing machine. 1
6 is fixed. A large number of V-shaped grooves 18 are radially provided on the surface of the adjustment dial 16 that faces the arm machine frame 101, and the surface of the adjustment dial 16 of the arm machine frame 10 that faces the V-shaped grooves 18 is provided with a number of V-shaped grooves 18. A stop pin 20 is embedded so that it can move forward and backward. This locking pin 20 has a V-shaped groove 1 at one end.
8 , the other end presses against a compression spring 24 , and the conical portion 22 is pressed into the V-shaped groove 18 . Note that 26 in the figure is a fixing screw that fixes the adjusting screw 12 and the adjusting dial 16. Next, the operation of this conventional device will be described. A rotational force is applied to the adjustment dial 16 to rotate the adjustment screw 12 fixed to the adjustment dial 16 with a fixing screw 26, thereby moving the contact portion 14 forward or backward. .

As the adjustment dial 16 rotates, the locking pin 20 that is in pressure contact with the V-shaped groove 18 at the conical portion 22
The tip slides inside the V-shaped groove 18 and retreats against the compression spring 24, and finally exits the V-shaped groove 18, and by further rotating the adjustment dial 16, the tip moves into the adjacent V-shaped groove 1.
8. Repeat this series of operations and
Any stitch adjustments will be made. However, in this type of conventional device, if the elastic force of the compression spring 24 is increased, a large force is required to rotate the adjustment dial 16, which is inconvenient to handle and reduces work efficiency. On the other hand, if the elastic force of the compression spring 24 is weakened, the adjustment dial 16 can be easily rotated, but the elastic force of the compression spring 24 may be weakened due to external factors such as rattling of each component and vibrations associated with operation. The adjustment dial 16 rotates against the rotation of the sewing machine, causing an accident in which the stitches are different from the initially set stitches.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to make it possible to easily adjust the seams, but to prevent the seams from changing due to external factors, and to improve workability.
It is an object of the present invention to provide a stitch adjustment device designed to prevent accidents.

In order to achieve the above object, the present invention has a stitch adjustment screw screwed onto the arm frame of a sewing machine so as to perform overall stitch adjustment by advancing and retracting, and a stitch adjustment screw having an outer spline on the outer periphery and fixed to the adjustment screw. an inner dial, an outer dial having an inner spline that is loosely attached to the outer spline of the inner dial, a compression spring pressed between the inner dial and the outer dial, and a stop plate fixed to the inner dial to prevent the outer dial from falling off. and are delivered on the same axis, and a plurality of locking holes are drilled in the inner dial with the same diameter from the axis at a pitch corresponding to the stitch scale, and the outer dial corresponding to the locking holes is connected. A release protrusion that can move forward and backward in the locking hole is provided, a loosening hole is provided in the arm machine frame of the sewing machine that corresponds to the locking hole, and the compression spring and the locking hole of the inner dial are inserted from the back into the loosening hole. It is characterized by a locking pin that can move forward and backward and is formed by internally welding.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

The present invention is shown in FIGS. 2 to 5, and the same members as in FIG. 1 are given the same reference numerals and their explanations will be omitted.

FIG. 2 is a perspective view of the attachment member to the arm machine frame 10 of the sewing machine.

In the figure, reference numeral 12 is an adjustment screw, and 2M is an inner dial having an outer spline 30 on its outer periphery and fixed to the adjustment screw holder 2. Further, 32 is an outer dial having an inner spline 34 that is loosely attached to the outer spline 301 of the inner dial 28;
A compression spring 36 is compressed between the inner dial 28 and the inner dial 28.
A stop plate 38 is integrally fixed to the inner dial 28 and the adjustment screw 12 by a fixing screw 26, and prevents the outer dial 32 from falling off due to the force of the compression spring 36 on the shore.

A flange 40 is provided on the inner dial 28 from the outer periphery of the outer spline 30 on the toarm machine frame 10 side.
A locking hole 42 is formed between the outer spline 30 teeth.

Further, the surface of the flange 40 on the opposite side from the arm machine frame 10 forms a striking surface 44. In addition, arm machine frame 1 of inner dial 28
A positioning protrusion 48 corresponding to the positioning hole 46 formed in the stop plate 38 is protruded on the opposite end surface of the inner dial 28.
This makes it easy to fix the stop plate 38 to the stop plate 38. Outer dial 32
The inner dial 28 has a storage part 50 that stores a part of the compression spring 36 in order to pressurize the compression spring 36 between the flange 40 and the rear surface 44 of the inner dial 28, and
A back and forth moving part 52 on which the flange 40 moves back and forth is provided around the periphery.

54 is a release protrusion corresponding to the end of the arm machine frame IQ side of the internal spline 34, and the back surface of the front and rear working part 52 is an internal impact face 56 against which the flange 40 of the inner dial 28 and the impact face 44 collide.
It consists of

Further, 201 is a sub-detent pin having a larger diameter than the shape of the locking hole 42 of the inner dial 28, and 24 is a compression spring that pushes the locking pin 20 toward the locking hole 42 side.

In addition, the tip of the locking pin 20 forms a pongee diameter portion 58 that is located inside the locking hole 42 when pushed by the compression spring 24, and the stepped portion that becomes the pongee diameter portion 58 of the locking pin 20 is located in the locking hole. It consists of a contacting bale surface 60 that comes into contact with the outer surface of 42. Further, 62 in FIG. 3 is a feed adjustment cam that the contact portion 14 of the adjustment screw 12 comes into contact with, 64 is the cam surface that the contact portion 14 comes into contact with, and 66 is the contact saddle portion 1.
4 is a fulcrum that operates the feed adjustment cam 62 by moving forward and backward, and 68 is a loosening hole for inserting the locking pin 20 and the compression spring 24 into the arm frame.

Next, regarding the operation of the present invention, a locked state and an unlocked state will be explained. FIG. 4 shows a locked state in which the stitches are fixed at arbitrary scales.

At this time, the outer dial 32 is in pressure contact with the stop plate 38 due to the elastic force of the compression spring 36, and the release protrusion 541 of the outer dial 32
Well, the locking pin 2 is located inside the locking hole 42 of the inner dial 28, and is located in the mounting hole 68 provided on the arm machine frame 10'.
01, the elastic force of the compression spring 24 forces the narrow diameter portion 58 at the tip into the locking hole 42. At this time, the locking pin 20 has a larger diameter than the locking hole 42 shape, so the locking pin 20 has a larger diameter than the locking hole 42 shape.
A support surface 60 is provided on the side of the second arm machine frame 10.
In this state, even if you try to rotate the outer dial 32, the inner dial 28 rotates together with the outer dial 32.
The pongee portion 58 of the locking pin 20 is located in the locking hole 42, and cannot be rolled over.

Furthermore, even if vibration occurs in the arm machine frame 10 of the sewing machine, there is no load pushing the locking pin 20 in the direction of the loose diamond hole 68 of the arm machine frame 10, so that the locking pin 20 and the inner dial 32 are The locking is maintained, and there are no accidents where the seams are changed. FIG. 5 shows the unlocked state for changing stitches, and the outer dial 32 is pushed toward the arm machine frame 10 from the state shown in FIG. 4.

At this time, the compression spring 36 provided between the outer dial 32 and the inner dial 28 is compressed, and the inner impact face 56 of the outer dial 32 collides with the impact face 44 of the inner dial 28, and the outer dial 32 is released. The protrusion 54 is flush with the end surface of the locking hole 42 of the inner dial 28 on the arm machine frame 10 side. Therefore, the locking pin 20 is pushed into the grain bag hole 68 of the arm machine frame 10, and the locking between the narrow recess 58 and the locking hole 42 is released. When the outer dial 32 is rotated in this state, the inner dial 28
Since the adjustment screws 12 and 12 rotate at the same time and the saddle portion 14 moves forward and backward, the stitches can be changed freely. Further, after setting the desired stitch, when the outer dial 32 is released, the locking state is achieved again by the elastic force of the vertical springs 24 and 36. In the present invention, even if a rotational moment is applied to the adjustment screw 82, inner dial 28, outer dial 32, etc. due to vibrations generated when the sewing machine is operating, this rotational moment is applied to the locking pin 20 and the locking hole 42. Since it does not act in the unlocking direction, accidents such as changes in stitches can be completely prevented.

Furthermore, when setting the stitches as appropriate, use the outer dial 32.
You can change stitches by simply pressing and turning the button, so it can be done with one hand and is easy to work with. Although the position of the locking hole 42 is not limited, if the locking hole 42 is located between the outer splines 30 of the inner dial 28 as in the embodiment, manufacturing is easy.

Also, the locking pin 2 may be formed into a round bar shape without providing the thin and light portion 58, but if the thin and light portion 58 and the twilling surface 60 are provided as in the embodiment, the elastic force of the compression spring 24 will be reduced. The inner dial 28 is fixed by the contact surface 60 of the locking pin 20' which is pushed by
The locking hole 42 only collides with the machine surface, and the elastic force of the compression spring 24 does not act on the outer dial 32, which can be moved forward or backward.

Therefore, since the structure is such that no external load is applied to the moving object, there is no play in the outer dial 32, which is a moving object, and the durability is significantly improved. Also, outer dial 3
2, an inner impact surface 56 is provided, and if the inner impact surface 56 is formed so that the impact surface 44 of the flange 40 of the inner dial 28 is guarded, even when the outer dial 32 is pressed, the inner impact surface 56 Since the rear surface 44 and the rear surface 44 are only pressed together, no load other than compressive force is applied to the compression spring 36, and there is no accident such as damage to the compression spring.
As described above, the present invention not only allows stitch setting to be performed easily, but also, once a stitch is set and locked,
The stitches are not changed due to external factors such as vibration of the sewing machine, and the workability is good and reliability is high.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of the conventional device, Fig. 2 is an exploded perspective view of the device of the present invention, Fig. 3 is a partially cutaway perspective view showing the device installed in a sewing machine, and Fig. 4 is a lock. A sectional view showing the state, FIG. 5 is a sectional view showing the unlocked state.

The same members in each figure are given the same symbols, 10 is the arm machine frame, 12 is the adjustment screw, 20 is the locking pin, 24 is the compression spring,
28 is an inner dial, 30 is an outer spline, 32 is an outer dial, 34 is an inner spline, 36 is a compression spring, 38 is a stop plate, 4 rivers are attached, 42 is a locking hole, 54 is a release protrusion,
58 is a narrow diameter portion.

Kikan koji Figure 2 Figure 3 Traditional 4 illustrations Traditional 5 illustrations

Claims (1)

[Scope of Claims] 1. A stitch adjustment screw screwed into the arm frame of the sewing machine so as to adjust the stitches by moving forward and backward, and an inner dial having an outer spline on the outer periphery and fixed to the adjustment screw. an outer dial having an inner spline that is loosely attached to the outer spline of the inner dial; a compression spring that is pressurized between the inner dial and the outer dial; and a stop plate fixed to the inner dial to prevent the outer dial from falling off; are arranged on the same axis, and a plurality of locking holes are drilled in the inner dial with the same diameter from the axis at a pitch corresponding to the stitch scale, and the locking hole is locked in the outer dial corresponding to the locking hole. A release protrusion that can freely move forward and backward in the hole is provided, a loosening hole is provided in the arm machine frame of the sewing machine that corresponds to the locking hole, and the compression spring and the inner dial are moved forward and backward into the locking hole from the back inside this loosening hole. A seam adjustment device characterized by being formed with a freely adjustable locking pin inside. 2. The stitch adjustment device according to claim 1, characterized in that a flange is provided on the outer periphery of the outer spline arm of the inner dial on the machine frame side, and a locking hole is formed between the teeth of the outer spline. 3. In the device according to claim 1 or 2,
A stitch adjusting device characterized in that the locking pin is formed to have a larger diameter than the locking hole, and a narrow diameter portion is provided at the tip of the locking pin so that the locking pin can be freely inserted into the locking hole.