JPS6111631B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to reducing the load on a starting lever of a cycle sewing machine that is started by a starting control operation and stops at a fixed position after a cycle of a certain number of stitches.

The cycle sewing machine shown in Fig. 1 has a starting lever 1.
is moved clockwise from the first position to the second position by operating the pedal (not shown), lowering the presser foot (not shown), and then by operating the starting lever 1 clockwise, the control lever is moved clockwise from the first position to the second position. 2 clockwise, the related clutch lever 3 is disengaged from the cam plate 4, and at the same time, the clutch 5 is connected to rotate the main shaft 7, and the cloth rotates at a reduced speed in conjunction with the main shaft 7. The feed cam 8 is rotated a predetermined number of times to operate a known stitch forming mechanism (not shown), and a blocking cam 9 supported coaxially with the cloth feed cam 8 is activated.
After the clutch 5 is disconnected by the return movement of the control lever 2, the clutch lever 3 is moved to the cam plate 4.
, the main shaft 7 is stopped at a predetermined rotation angle position, and the stitch forming mechanism is thereby stopped.

Conventionally, this type of sewing machine always exerts a clockwise force on the clutch lever 3 by a spring 10 provided between the sewing machine body 12 and the clutch lever 3, as shown in FIG. Since the starting lever 1 is pulled counterclockwise by the spring 11 provided between the sewing machine body 12 and the starting lever 1, the control lever 2 is rotated clockwise by operating the starting lever 1 clockwise. At this time, the elastic forces of the two springs 10 and 11 act, so in order to disengage the clutch lever 3 from the cam plate 4, the activation lever 1 must be moved to a predetermined position against the fairly strong elastic forces of the springs 10 and 11. It is necessary to rotate the machine to the desired angle by operating the pedals, which has the disadvantage of tiring the operator.

The purpose of this invention is to eliminate the above-mentioned drawbacks, and by providing a spring 11 between the clutch lever 3 and the starting lever 1, the clutch lever 3 can be moved counterclockwise by clockwise operation of the starting lever 1. When rotating in the direction, the elastic force of the spring 11 is reduced, thereby providing a device in which the load on the pedal is reduced.

Embodiments of the invention will be described with reference to the drawings.

FIG. 1 is a perspective view of the main parts of this invention,
Reference numeral 1 denotes a starting lever rotatably supported on the sewing machine body 12 by a base shaft 1a, and a chain 13 connected to a pedal (not shown) is provided at the tip.

2 is an L-shaped control lever 2 whose central part is rotatably supported by the same base shaft 1a as the starting lever 1;
A long hole 2b in the vertical direction is formed in the horizontal part, and a step screw 14 that loosely fits into the long hole 2b is inserted into the activation lever 1.
At the same time, a roller 2a is provided at the tip of the vertical portion.

Reference numeral 3 designates a clutch lever whose body is rotatably supported on the sewing machine body 12 by a support shaft 3a provided in a direction perpendicular to the base axis 1a of the starting lever 1. A locking portion 3b is provided at the upper end, and a clutch lever 3 is provided with a locking portion 3b at the upper end. The distal end of the actuating plate 16 fixedly disposed on the body and the distal end of the horizontal portion of the control lever 2 are connected by a link 15, and the clutch lever is activated by clockwise rotation of the control lever 2. 3 in the counterclockwise direction to lock the locking portion 3b of the clutch lever 3 onto the cam plate 4.
Configure it so that it separates from the .

A low-speed clutch 5 and a high-speed clutch 6 fixed to the main shaft 7 are loosely fitted to the main shaft 7 and are detached from the low-speed pulley 5 and high-speed pulley 6, which are constantly rotated by a drive source (not shown), before the sewing machine is driven. At this time, the clutch lever 3
The engaging portion 3c is in the position shown in FIG. When the clutch lever 3 rotates counterclockwise, the engaging portion 3c of the clutch lever 3 moves counterclockwise to connect the low speed pulley 5a to the low speed clutch 5, and the main shaft 7 starts to rotate at a low speed, and the clutch lever When the engaging portion 3c of 3 moves further counterclockwise, the low speed clutch 5 is disengaged from the low speed pulley 5a, the high speed clutch 6 is connected to the high speed pulley 6a, and the main shaft 7 is rotated at high speed.

A blocking cam 9 is provided on the base shaft 8a of the cloth feed cam 8 that rotates at a reduced speed in relation to the main shaft 7, and the outer circumferential portion of the blocking cam 9 has a high-speed portion 9a that is a perfect circular circumferential portion and a high-speed portion 9a that is inclined from the high-speed portion 9a. A low speed portion 9b and a low speed portion 9b forming a surface and having a shorter distance from the center than the high speed portion 9a.
A stop portion 9c is formed at the center of the stop portion 9c and has a shorter distance from the center than the low speed portion 9b.

Reference numeral 10 denotes a first elastic spring; one end is engaged with a support rod 17 provided on the upper part of the sewing machine body 12, and the other end is supported on the actuating plate 16 of the clutch lever 3, so that its elastic force causes the clutch lever 3 to move. is constantly applied in the clockwise direction in FIG. 1, and the control lever 2 is pulled counterclockwise to press the roller 2a at the tip of the vertical portion of the control lever 2 against the outer periphery of the cutoff cam 9.

Reference numeral 11 denotes a second elastic spring stretched between the actuating plate 16 of the clutch lever 3 and the starting lever 1, and the elastic force of the spring 11 is weaker than that of the spring 11.
In conjunction with the presser foot lifting device disclosed in Japanese Patent No. 29212, the activation lever 1 that moves the presser foot (not shown) up and down is pulled counterclockwise.

The operation of the present invention having the above configuration will be explained.

The first position is defined as the solid line in FIG. In the first position, the presser foot (not shown) is in a raised position;
When a cloth (not shown) is placed on a seam (not shown) and a pedal (not shown) is stepped on, the starting lever 1 rotates clockwise against the elastic force of the spring 11, and the lower end of the step screw 14 is rotated. Long hole 2b of control lever 2
while the presser foot (not shown) is lowered to press the fabric (not shown) onto the seam (not shown). During this time, the sewing machine is in a stopped state.

To drive this sewing machine, the pedal (not shown) is further depressed and the starting lever 1 is rotated clockwise against the elastic force of the first elastic body spring 10. By moving the control lever 2 to the third position shown by the dashed line and moving the step screw 14 that contacts the lower end of the elongated hole 2b downward, the control lever 2 is rotated clockwise and the clutch lever 3 is simultaneously rotated. The locking portion 3b of the clutch lever 3 is disengaged from the cam plate 4 by moving counterclockwise in FIG. 1, and the engaging portion 3c of the clutch lever 3 is rotated counterclockwise from the position shown in FIG. , low speed clutch 5
The connection operation is performed to rotate the main shaft 7 at a low speed.

At this time, since the spring 11 moves together with the clutch lever 3, the elastic force of the spring 11 against the activation lever 1 becomes weaker, reducing the force exerted on the operator operating the pedal (not shown).

As the main shaft 7 rotates, the cloth feed cam 8 begins to rotate, and as the cut-off cam 9 rotates, the roller 2a of the control lever 2, which was in pressure contact with the stop portion 9c on the outer periphery of the cut-off cam 9, is moved to the low-speed portion 9b of the cut-off cam 9. will be guided to.

Furthermore, due to the rotation of the cutoff cam 9, the control lever 2
When the roller 2a of the shutoff cam 9 is guided from the low-speed portion 9b to the inclined surface, the control lever 2 rotates clockwise against the elastic force of the spring 10, and the clutch lever 3 is moved to the first position via the link 15. The engaging portion 3c of the clutch lever 3 is moved counterclockwise in the figure.
By moving counterclockwise, the low speed clutch 5 is disengaged from the low speed pulley 5a. During this time,
The low speed clutch 5 rotates due to its inertia, and rotates the main shaft 7 and the cloth feed cam 8 and cutoff cam 9 connected thereto due to its inertia.

When the roller 2a of the control lever 2 is further guided from the inclined surface of the cut-off cam 9 to the high-speed section 9a by the inertial rotation of the cut-off cam 9, the control lever 2 rotates clockwise, thereby causing the clutch lever 3 to engage. By further moving the portion 3c counterclockwise, the high speed clutch 6 is connected to the high speed pulley 6a, and the main shaft 7 is connected to the high speed clutch 6.
rotate at high speed.

When the pedal (not shown) is depressed, the clutch lever 3 is rotated counterclockwise in FIG. 1, and the main shaft 7 is rotated at low speed to drive the sewing machine. 1
The stepped screw 14 is brought into pressure contact with the upper end of the elongated hole 2b of the control lever 2 by the spring 11.

A predetermined seam is formed by the high-speed rotation of the main shaft 7, and the cut-off cam 9
When the roller 2a rotates once, the roller 2a is guided from the high speed section 9a of the cutoff cam 9 to the inclined surface.

Thereafter, the roller 2a of the control lever 2 is guided by the rotation of the cutoff cam 9 from the inclined surface of the cutoff cam 9 to the low speed portion 9b and further to the stop portion 9c. During this time, the control lever 2 and the clutch lever 3 operate in response to the above-described movement of the roller 2a of the control lever 2.

Control lever 2 rotates counterclockwise to connect link 1.
5 by moving the clutch lever 3 back in the clockwise direction in Figure 1 and returning to the position shown in Figure 1.
After the engaging part 3c of the clutch lever 3 returns to its original position and disengages the low-speed clutch 5 from the low-speed pulley 5a, the engaging part 3b of the clutch lever 3 is engaged with the cam plate 4, and the drive source ( (not shown) to the main shaft 7, and the sewing machine stops.

Through this series of operations, a predetermined seam is formed in the cloth (not shown), and then the presser foot (not shown) is raised. Then, the cloth (not shown) may be removed from the stitched portion (not shown).

As explained above, according to the present invention, the spring 11 which is the second elastic body is provided between the clutch lever 3 and the starting lever 1, and when only the starting lever 1 is operated, the elastic force of the spring 11 is reduced. When the clutch lever 3 is actuated by further operating the activation lever 1, it moves together with the clutch lever 3 and moves to the second position.
By reducing the elastic force of the spring 11, which is an elastic body, the clutch lever 3 is activated by operating the starting lever 1.
Since the elastic body is reduced when operating the cycle sewing machine, the operator's operating force when starting the cycle sewing machine can be reduced, which is effective in reducing fatigue caused by work and improving work efficiency. be.

In the above embodiment of the present invention, the spring 11 is provided between the activation lever 1 and the actuation plate 16 of the clutch lever 3, but it may be provided between the activation lever 1 and the arm of the clutch lever 3. . Also, spring 10
In the embodiment described above, it is provided between the sewing machine main body 12 and the clutch lever 3, but the same effect can be obtained even if it is provided between the sewing machine main body 12 and the control lever 2.

Furthermore, although the activation lever 1 is operated by a pedal, it may also be operated by a magnet, which is highly effective in reducing power consumption.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts of the present invention with some parts omitted, FIG. 2 is an explanatory view of the operation, and FIG.
The figure is an explanatory diagram of the operation of the conventional embodiment. In the figure, 1 is a starting lever, 2 is a control lever, 3 is a clutch lever, 7 is a main shaft, 9 is a cutoff cam, 10
is a first elastic body, and 11 is a second elastic body.

Claims (1)

[Scope of Claims] 1. A main shaft 7 rotatably supported on the sewing machine body and capable of approaching and separating from a drive source via a clutch; A clutch lever 3 whose free end is pressed into contact with the clutch and whose base can be rotated around a fixed axis so as to stop the main shaft when inactive, and a shutoff which has a cam surface on its outer periphery and rotates in conjunction with the main shaft. The cam 9 has one end always in contact with the cam surface of the cut-off cam, and is capable of reciprocating movement by the rotation of the cut-off cam, and also moves the clutch lever forward in conjunction with the forward movement, and returns the clutch lever in conjunction with the backward movement. A control lever 2 is disposed in relation to the clutch lever so as to move, and is spanned between the sewing machine body and the control lever or the clutch lever, and one end of the control lever is brought into pressure contact with the cam surface of the cutoff cam, and the clutch lever is restored. a first elastic body 10 having an elastic force for actuating a control lever or clutch lever to move; a first position disposed in relation to the presser foot and operable to move the presser foot from a raised position to a lowered position; an actuating lever 1 which is movable from the clutch lever to a second position and which is disposed in relation to the control lever and movable to a third position which moves the control lever forward in order to move the clutch lever forward; The actuating lever is spanned between the first elastic body and the first elastic body, and operates the actuating lever so as to return the actuating lever to the first position. A device for reducing the load on a starting lever in a cycle sewing machine, comprising: a second elastic body 11 that moves together with the clutch lever when moving to the position of the clutch lever.