JPS63275369A - Start apparatus of cycle sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a cycle sewing machine, and particularly relates to a cycle sewing machine that reduces the labor of an operator when starting sewing work, or that uses various devices to start sewing work. The present invention relates to a starting device for a cycle sewing machine that reduces the labor required to move the machine to a predetermined position.

[Prior Art] Conventionally, a Suofuru sewing machine is started by depressing the start pedal, which triggers the clutch lever and transmits the driving force of the boot linked to the power motor to the main shaft. . When one cycle of sewing operation is completed, the control roller at one end of the clutch cam lever falls into the recess of the clutch cam that interlocks with the main shaft, and the clutch lever is automatically activated.
collapses, the transmission of power from the boob to the main shaft is cut off, and rotation is stopped by the action of the brake mechanism.

[Problems to be Solved by the Invention] However, when starting a sewing machine, the main shaft may not be fixed when not started. Therefore, the starting pedal is simultaneously subjected to the resistance force of the load spring of the brake mechanism, other biasing means, etc., resulting in a problem that the pedal is heavy.

SUMMARY OF THE INVENTION Therefore, the present invention solves the above problems and operates a brake mechanism etc. using the power of a power source at the time of startup.
The following configuration was adopted for the purpose of providing a starting device for a cycle sewing machine that reduces the operator's effort at starting up.

[Means for Solving the Problems] That is, the main point of the present invention is to provide a main drive shaft rotatably supported on the frame of a sewing machine, and a connection between the main drive shaft and a drive source. - A clutch that controls disconnection, a cam contactor that is interlocked with the clutch, and a cam contactor that is interlocked with the main drive shaft and engaged with the cam contactor, so that the clutch is operated during one sewing cycle after the startup operation. In a starting device for a cycle sewing machine, the cam contactor is disengaged from the stopping position of the control cam at the time of starting, and a control cam for moving the clutch to the stopping position after the completion of one sewing cycle when held in the starting position. Before completing the process, the clutch performs connection control, and the starting cycle sewing machine is configured such that the displacement portion of the control cam that moves from the stop position to the starting position comes into contact with the cam contactor to provide power in the direction of the starting position. It's in the device.

[When the action is started, the cam contactor attempts to disengage from the stop position of the control cam due to the operator's startup operation, but before the disengagement is completed, the clutch engages the clutch.

Therefore, the main shaft receives power from the drive source and begins to rotate. At the same time, the control cam linked to the main shaft also begins to rotate. The cam contactor has not yet left the stop position and requires starting force from various mechanisms, but since the control cam receives rotational force from the drive source via the main shaft, it can move from the stop position to the start position. The displaced part of the cam contacts the cam contact,
Apply force to move the cam contactor in the direction of the starting position. That is,
The activating force for various mechanisms is applied via the cam contactor. Therefore, the operator can start the sewing machine using only the Kurasochi connection force.

[Example] Next, the present invention will be explained in detail. The present invention is not limited to these, but includes various embodiments without departing from the gist thereof.

FIG. 1 is a front view showing the starting device of the cycle sewing machine of this embodiment, and FIG. 2 is a bottom view thereof.

A fixed support shaft 3 projects from the inside of the sewing machine frame 1 on the side plate 1a of the sewing machine frame 1, and a clutch body 9, a power pulley 11, a power cam and a spring (not shown) are rotatably attached to the support shaft 3. There is. The power cam brings a contact end of a contactor (not shown) into contact with a contact surface formed on its outer periphery, and receives rotational driving force from the clutch body 9 when the clutch body 9 rotates. A cam groove having a substantially rectangular cross section is provided on the outer periphery of the clutch body 9, and two of the arms of a power drive lever 15, which is swingably supported by a shaft 14 provided on the side plate 1a, are provided in this cam groove. two arms 17.1
Either roller member 17a or 19a provided at the tip of 9 is inserted.

Therefore, when either of the inserted roller members 17a, 19a rides up or down on the protrusion in the cam groove, the clutch body 9 is separated from or pressed into contact with the power pulley 11, and the electric motor (not shown) is moved. The driving force from the power pulley 11, which is driven and rotated, is disconnected or connected, and whether or not the clutch body 9 rotates is controlled. At this time, the rotation of the power cam that is interlocked with the clutch body 9 is also controlled, and the presser foot and the thread removing device (not shown) are driven and controlled.

The power drive lever 15 has a starting pedal wire 21 (not shown) installed on the other arm thereof, and is linked to a substantially U-shaped cam plate 25 by a clutch linking rod 23 that is pivotally supported. The cam plate 25, which is urged in the right direction in the figure by a spring 26 stretched and stretched between the side plate 1a, connects and disconnects the rotational driving force to the sewing machine main shaft 27.
By pressing the steel ball 28 with the convex portion 25a of the cam plate 25, the main shaft power pulley 29 is connected to the coaxial clutch body 30.
The main shaft 27 is rotated to start the sewing operation of the sewing machine. In the state shown in FIG. 1, the steel ball 28 is not pushed and no driving force is transmitted to the main shaft 27. The stopper tie 31a at the tip of the stopper 31 collides with the pawl 33a of the stop cam 33 immediately after the sewing operation ends, and the main shaft 27
rotation is stopped at a predetermined rotational phase position.

On the other hand, a brake support shaft 35 is attached to the side plate 1a near the main shaft 27.
A brake arm 37 is swingably supported. The brake arm 37 is biased in the circumferential direction of the stop cam 33 coaxially interlocked with the clutch body 30 by a spring 39 extended and tensioned between its tip and the side plate 1a. A brake shoe 37a is provided at a portion that contacts the circumferential surface of the stop cam 33, and when the brake shoe 37a comes into contact with the circumferential surface of the stop cam 33, the stop cam 33 rotates due to inertia.
brake. Further, a brake adjusting shaft 41 is provided on the cam plate 25 and swings integrally with the cam plate 25, facing the brake arm 37. The brake is adjusted.

On the other hand, as shown in FIG. 2, a feed cam 43 that is interlocked with the rotation of the main shaft 27 is arranged on the bottom surface of the sewing machine frame 1. This feed cam 43 swings a vertical feed cam lever and a horizontal feed cam lever that are in contact with the cam surface (not shown) in accordance with the rotation of the main shaft 27, thereby moving the feed base on which a cloth presser (not shown) is disposed. It is moved on a horizontal plane to perform a predetermined sewing operation. A clutch cam 45 is coaxially attached to the feed cam 43, and a notch 47 is provided on the outer periphery of the clutch cam 45. One side of the notch 47 is a displacement part 49 cut perpendicularly to the tangent, while the other side forms a displacement part 51 cut diagonally to the tangent.

A clutch cam lever 55 is swingably supported on a shaft 53 near the feed cam 43, one end of which forms a temporal roller 57 as a contact for the outer periphery of the clutch cam 45, and the other end of which is used for the power drive. A locking pawl δ9 is formed for a locking portion 15a formed at the base of the arm 19 of the lever 15. Further, a spring 61 is extended and tensioned between the control roller 57 and the shaft 53 and the sewing machine frame 1 at an intermediate portion thereof.

Since the present embodiment is configured as described above, when the operator depresses the starting pedal to start the sewing operation, the power drive lever 15 swings in the counterclockwise rotation direction, and the locking portion 15a of the power drive lever 15 swings to the left. move in the direction. Then, the clutch cam lever 55 on the bottom moves the spring 61 in response to the movement of the locking part 15a.
It starts to rotate clockwise due to the urging force of . As shown by the two-dot chain line, when the control roller 57 of the clutch cam lever 55 has begun to disengage slightly from the notch 47, the power drive lever 15
The cam plate 25, which began to tilt toward the foreigners in conjunction with the
5a presses the steel ball 28, and attaches the power pulley 2 to the main shaft 27.
9 driving force is transmitted. Since the main shaft 27 is interlocked with the clutch cam 45, the clutch cam 45 also receives the driving force and begins to rotate clockwise. Therefore, the obliquely cut displacement portion δ1 collides with the control roller 57 that is slightly raised from the bottom of the notch portion 47. After the collision, the clutch cam 45 attempts to rotate further, and its displacement portion 51 pushes up the control roller 57. In this way, the clutch cam lever 55 is connected to the locking portion 1 of the power drive lever 15.
5a with the locking claw 59, the power drive lever 15
is further swung in the counterclockwise rotation direction against the biasing force of the spring 26, regardless of the pressing blade of the operator's starting pedal.

At this time, the brake adjustment shaft 41, which swings together with the cam plate 25, resists the biasing force of the spring 39, causing the brake F! 37 and press it. As a result, the brake arm 37 swings to the left, the brake shoe 37a separates from the circumferential surface of the stop cam 33, and the rotational resistance of the main shaft 27 is completely eliminated.

At the same time, the stop tie 31a also connects the claw 33 of the stop cam 33.
Leave from a.

The sewing operation starts in this way, and then, when the feed cam rotates once, the control roller 5 is moved from the displacement part 49 side to the notch 47 of the coaxial clutch cam 45 by the biasing force of the spring 26.39.
7 is depressed, and as a result, the locking pawl 59 at the other end of the clutch cam lever 55 allows the power drive lever 15 to rotate clockwise.

In this way, the cam plate 25 returns to its original position, stops supplying the driving force to the main shaft 27, and finishes the sewing operation. At the same time, the brake shoe 37a contacts the circumferential surface of the stop cam 33 to brake the rotation, and the stop tie 31a also engages the pawl 33a to stop the rotation at a predetermined phase position.

In this way, the operator can start the various mechanisms of the sewing machine and start the sewing operation simply by connecting the clutch mechanism of the main shaft 27.

In the above-described configuration, the clutch cam lever 55 corresponds to a cam contactor, the clutch cam 45 corresponds to a control cam, the notch 47 corresponds to a stop position of the control cam, and the displacement part 51 corresponds to a displacement part, The peripheral surface of the clutch cam 45 corresponds to the starting position.

Although the displacement portion 51 is linear, it can take various shapes as necessary, such as an arcuate shape.

The starting device for the cycle sewing machine of the present invention is such that, at the time of starting, the clutch performs connection control before the cam contactor completes disengagement from the stop position of the control cam, and changes the control cam from the stop position to the start position. Since the displacement part that moves to the cam contactor contacts the cam contactor and applies power in the direction of the starting position, the operator can start the sewing machine with an extremely light operation, reducing effort. Not needed.

[Brief explanation of the drawing]

FIG. 1 is a front view of the starting device of the cycle sewing machine of this embodiment, and FIG. 2 is a bottom view thereof. 15... Power drive lever 25... Cam plate 27
...Main shaft 37...Brake arm 2B
, 39.61... Spring 45... Clutch cam 47... Notch 51
...Displacement part 55...Clutch cam lever

Claims (1)

[Claims] A main drive shaft rotatably supported on the frame of the sewing machine, a clutch that controls connection/disconnection between the main drive shaft and the drive source, and a cam contactor interlocked with the clutch. and, by interlocking with the main drive shaft and engaging with the cam contactor, the clutch is held in the starting position during one sewing cycle after the starting operation, and the clutch is brought into the stopping position after the completion of one sewing cycle. In a cycle sewing machine starting device equipped with a control cam for movement and
Before the cam contact completes disengagement from the stop position of the control cam, the clutch engages and controls, and the displacement portion of the control cam that moves from the stop position to the start position comes into contact with the cam contact and moves toward the start position. A starting device for a cycle sewing machine configured to provide power.