JPS5931358B2 - Cycle sewing machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In a cycle sewing machine in which a control cam performs cycle drive for a predetermined number of stitches to form a predetermined pattern of stitches, the present invention is arranged between a main shaft of the sewing machine and a driving body, and is configured to stop the sewing machine when the cycle is completed. Regarding a control device for a cycle sewing machine that decelerates and then cuts off the main shaft and the driving body and stops at a predetermined needle position, in particular, it has separate high-speed and low-speed rotating bodies connected to the main shaft as a means of transmission from the driving body. This invention relates to a device that decelerates these rotating bodies by engaging and disengaging them from an interlocking body.

The purpose of this invention is to reduce the impact on the device and extend the life of the sewing machine.

Examples of the present invention will be described with reference to the drawings, for example:
As described in Japanese Patent Application Laid-Open No. 48-82951, in a sewing machine that controls cycle drive of a predetermined number of stitches using a control cam to form a predetermined pattern of stitches, a sewing machine is rotatably supported on a machine frame (not shown). The support shaft 1 has an L-shaped tip that can be fitted into a cutout 2a of a cutoff cam 2, which will be described later, and a cutout 5a, which can be fitted with a locking part 4a of a locking body 4, which will be described later. A deceleration arm 5 has a protruding roller 8 that can be engaged with a deceleration cam 1 of a holder 6 that will be described later, and a high portion 10a and a low portion that can be engaged with a ball 9 that will be described later. An operating arm 11 having an operating piece 10 fixed at its tip forming an operating arm 10b is sequentially fixed in the axial direction of the support shaft 1, and in response to the displacement of the control cam (not shown), the support shaft 1 , one position in which the deceleration arm 5 is separated from the cutoff cam 2 and deceleration cam 7 and the high portion 10a of the action piece 10 engages with the ball 9;
It engages with the deceleration cam 7 and swings between the lower part 10b of the action piece 10 and the other position where it engages with the ball 9, and is always subject to an elastic force in the direction of the one position.

A drive shaft 1 rotatably supported on the machine frame parallel to the support shaft 1
2 connects one end in the axial direction (the right end in Figures 1 and 2) so that the control cam is decelerated and rotated by the rotation, and the sewing machine main shaft ((1), not shown) is rotated in synchronization. death,
A hole 13 opened toward the other end in the axial direction on the axis of the other end in the axial direction
An actuator 15 is loosely fitted into the hole 13, and is always subjected to an elastic force in the other axial direction by a coiled spring 14.

A support 16 is fixed to the other axial end of the drive shaft 12 .

The main pulley 17 loosely fitted onto the drive shaft 12 on the other side in the axial direction of the support body 16 rotates at high speed in conjunction with a motor (not shown) via a V-bell (A). A support plate 18 having a larger diameter than the drive shaft 12 is fixed to the other end, and the support plate 18 faces the opening of the hole 13 so as to always engage with the other end surface of the operator 15 in the axial direction. To always receive the elastic force of the coiled spring 14, the ball 9 is held between the support body 18 and the action piece 10 fixed to the action arm 11, and the action piece 1 is attached to the ball 9.
0 engages, the support plate 18 is pushed by the ball 9 and resists the elastic force of the coiled spring 14, so that the main pulley 1
7 to one side in the axial direction to press the belt A against the support 16, and due to the frictional resistance, the support 16 is integrally rotated at the rotational speed of the main pulley 17, and the lower part 10 of the working piece 10 is moved.
When b is engaged, the support plate 18 is pushed by the actuator 15 due to the elastic force of the coiled spring 14 and moves the main pulley 17 in the other direction in the axial direction, thereby separating the belt A from the support body 16.

The control cam 2 fixed to the drive shaft 12 at a distance in one axial direction of the support body 16 allows the tip of the blocking arm 3 to engage with the cam portion on the outer periphery, and the tip of the blocking arm 3 can fit on the engagement path. A notch 2a is formed, and a protrusion 2b protruding in the other direction from the other end surface in the axial direction is formed.

The holding body 6, which is loosely fitted on the drive shaft 12 between the support body 16 and the cutoff cam 2, is always kept in one direction in the axial direction (the left side in FIGS. ), and a blocking cam 2 is placed on one end surface in the axial direction.
an engagement groove 20 into which the protrusion 2b is slidably fitted in the axial direction;
A sub-pulley 22 is rotatably supported on the outer periphery of the other end in the axial direction via a bearing 21, and the sub-pulley 22 is connected to a motor via a belt B and rotates at low speed.

A deceleration cam 7 that can engage the rollers 8 of the deceleration arm 5 is formed on one end surface in the axial direction of the large diameter portion in the axially intermediate portion, and a regulating cam 23 is formed on the outer peripheral surface.

The deceleration cam 7 has a high part 7a that projects in the axial direction and a low part 7b that retracts, and the rollers of the deceleration arm 5 are connected to the high part 7.
a, the holder 6 is pushed by the rollers 8 and moves in the other direction in the axial direction against the elastic force of the coiled spring 19, pressing the belt B of the supported sub pulley 22 against the support 16. Due to the frictional resistance, the support body 16 is integrally rotated at the rotational speed of the sub pulley 22, and when the roller 8 engages with the lower part 7b, the holding body 6 is moved to one side in the axial direction by the elastic force of the coiled spring 19. Then, the bell l-B of the sub pulley 22 is separated from the support 16.

A roller 25 provided at the intermediate portion of the locking body 4, which is rotatably supported on the machine frame around a shaft 24 parallel to the drive shaft 12 and always receives an elastic force in the clockwise direction in FIG. When the roller 25 engages with the small diameter portion a, the locking portion 4a is located on the circuit path of the cutout portion 5a of the deceleration arm 5, and when the roller 25 engages with the large diameter portion 23b, the locking portion 4a is located on the circuit path of the notch 5a of the deceleration arm 5. The locking body 4 is rotated counterclockwise in FIG. 3 so that the locking member 4a is separated upward from its path.

When the locking part 4a fits into the notch part 5a, the action piece 1
The support shaft 1 is held at an intermediate position between one position and the other position so that the lower portion 10b of the roller 8 is engaged with the ball 9 and the roller 8 is not engaged with the deceleration cam 7.

Note that the rollers 25 of the engaging body 4 are connected to the small diameter portion 23 of the regulating cam 23.
a, the support shaft 1 is controlled by the control cam so as to rotate from one position to the other position, and the roller 25 of the locking body 4 engages with the small diameter portion 23a of the regulating cam 23.
When moving from the deceleration arm 5 to the large diameter portion 23b, the roller 8 of the deceleration arm 5 is set so as to correspond to the lower part 7b of the deceleration cam 7, and the tip of the cutoff arm 3 is set to correspond to the outer circumference of the cutoff cam 2. The distal end of the blocking arm 3 is set to fit into the notch 2a of the blocking cam 2 when the roller 8 makes approximately one rotation and engages the lower portion 7b again.

The present invention has the above-mentioned configuration, and its operation will be explained from the cycle drive state of the sewing machine with the support shaft 1 located at one position.
Separated from the deceleration cam 7, the high portion 10a of the circumference piece 10 engages with the ball 9, presses the belt A against the support 16, and presses the belt A against the drive shaft 12.
rotates at high speed, and the sewing machine is driven at high speed.

Immediately before the cycle is completed under the control of the control cam, the support shaft 1 is rotated toward the other position due to elastic force.

At this time, the roller 25 of the locking body 4
3a, and the locking part 4a fits into the cutout part 5a of the deceleration arm 5 to hold the support shaft 1 at an intermediate position between one position and the other position, and the roller 8 of the deceleration arm 5 and the blocking arm 3 are separated from the deceleration cam 7 and the cutoff cam 2, the lower part 10b of the operating piece 10 is engaged with the ball 9, and the main pulley 17 is moved to the other side in the axial direction by the coiled spring 14 (right side in FIG. 1). The belt A is moved away from the support 16, and the drive shaft 12 is idled at high speed.

The drive shaft 12 further rotates, and the rollers 25 of the locking body 4 engage with the large diameter portion 23b of the regulating cam 23, and the locking body 4 rotates counterclockwise, and the locking portion 4a engages with the notch. 5a, and the support shaft 1 rotates to the other position.

The roller 8 of the deceleration arm 5 engages with the lower part 7b of the deceleration cam 1,
The blocking arm 3 engages with the outer periphery of the blocking cam 2, and the drive shaft 12 continues to idle at high speed.

(Fig. 7) The rotation of the drive shaft 12 causes the roller 8 to move towards the high part 7 of the deceleration cam 7.
a, the holder 6 is pushed by the rollers 8 and moves in the other axial direction (to the right in FIG. 7) against the coiled spring 19, pressing the belt B of the sub pulley 22 against the support 16. , the drive shaft 12 is decelerated by the rotational speed of the sub pulley 22 and rotates at a low speed.

(Fig. 8) When the roller 8 engages with the lower part 7b of the deceleration cam 7 again due to the rotation of the drive shaft 12, the holder 6 is moved to one side in the axial direction (to the left in Fig. 8) by the coiled spring 19. The belt B of the sub pulley 22 is separated from the support 16, and the drive shaft 12 is idled at low speed.

Thereafter, the tip of the blocking arm 3 fits into the notch 2a of the blocking cam 2, the drive shaft 12 is immediately stopped, the sewing machine is stopped, and - cycle sewing is completed.

(FIG. 9) As described above, according to the present invention, after the main pulley 17 is cut off from the drive shaft 12 at the completion of the cycle and the drive shaft 12 enters a high-speed idling state, the sub-boot! J-2
2 is connected to the drive shaft 12 to decelerate the drive shaft 12 to rotate at a low speed, and then after that, the sub pulley 22 is shut off from the drive shaft 12 to put the drive shaft 12 in a low speed idle state, and then the cutoff arm is connected to the cutoff cam 2. 3 is fitted to stop the drive shaft 12, the operation of decelerating and stopping the drive shaft can be performed smoothly and reliably, and the life of the sewing machine can be extended without applying sudden shock to each component. Effects such as lengthening can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of this embodiment, Fig. 2 is a partially sectional plan view of this embodiment, Fig. 3 is a left side view of the speed reduction mechanism, and Fig. 4 is a partially sectional front view of this embodiment.
The figure is a right side view of the shutoff mechanism, Figure 5 is the right side view of Figure 1,
FIG. 6 is a partially sectional front view for explaining the action, and FIGS. 7 to 9 are partially sectional front views for explaining the action. 1 is a support shaft, 2 is a blocking body, 3 is a blocking means, 12 is a drive shaft, 16 is a support body, 17.22 is a main and sub rotating body, 9-1
1.13 to 15.18 are operating means, 4.23 is a locking means, and 5 to 8 are deceleration means.

Claims (1)

[Claims] 1- A control cam that drives the sewing machine to open a predetermined number of stitches in relation to rotation about an axis to form a predetermined pattern of stitches, and a drive rotatably supported on the machine frame and connected to the main shaft of the sewing machine. A shaft, a support body fixed to the drive shaft, and a driving body which is arranged separately on both sides of the support shaft in the axial direction and is rotatable with respect to the drive shaft and movable in the axial direction so as to move toward and away from the support body. The main and auxiliary rotating bodies always rotate at different speeds (high or low) in conjunction with It is able to swing to the opposite position and an intermediate position between them, and is always subjected to an elastic force in one position.It moves to the opposite position against the elastic force at the start of the cycle in conjunction with the rotation of the control cam, and stops the cycle. A support shaft that is released from locking immediately before completion, and an operating means that is arranged in relation to the support and the main rotor so that the main rotor is pressed against the support shaft at a position opposite to the support shaft and separated from the support shaft at one and an intermediate position. The support shaft and the drive shaft are arranged so that when the support shaft is released, the support shaft is locked at an intermediate position in relation to the rotation of the drive shaft, and the lock of the support shaft is released after the main rotating body is separated from the support body. and a locking means arranged in relation to the support shaft, and a locking means connected to the sub-rotator so as to decelerate the drive shaft by pressing the sub-rotator against the support at one position of the support shaft, and then separating the sub-rotator from the support. A deceleration means is arranged in relation to the sub-rotating body and the support shaft so as to interrupt the connection at the intermediate and reverse positions, and a deceleration means is arranged in relation to the sub-rotating body and the support shaft so as to interrupt the connection at intermediate and opposite positions, and a deceleration means is provided at the cutout portion of the blocking body after the sub-rotating body is separated from the support body at one position of the support shaft. A control device for a cycle sewing machine comprising a blocking means disposed in relation to the blocking body and a support shaft so as to be coupled to the blocking body in a mating manner and to interrupt the connection in an intermediate and reverse position.