JPH0243338Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a sewing machine that can repeatedly execute a predetermined sewing pattern while changing the sewing speed appropriately using a cam plate rotated by an upper shaft. This invention relates to a drive stop device.

[Conventional technology]

4 to 10 are diagrams showing a conventional cycle sewing machine and a drive stop device incorporated therein.

In the figure, 1 is a motor as a driving means,
The driving force is transmitted to the drive pulley 4 via the motor pulley 2 and the V-belt 3. Further, the drive pulley 4 is movable in the left and right direction,
When moving to the left, it is connected to the drive clutch 5,
An upper shaft 6 fixed to the center of this drive clutch 5
The driving force from the motor is transmitted to the motor. A cam plate 7 is connected to the upper shaft 6 via gears 8, 9, 10 and a drive shaft 11, and has a cam groove 7a formed on its upper surface. Reference numeral 12 denotes a cloth conveying member (fabric conveying means) that moves over the sewing machine bed MB along the cam groove 7a and conveys the cloth via a cloth presser foot (not shown) provided at the tip. One rotation moves the cloth one sewing cycle, and the needle forms one sewing pattern. Reference numeral 13 denotes a cutoff notch protruding from the lower surface of the cam plate 7, and is provided at a rotational position where one sewing cycle ends. Reference numeral 14 designates a low-speed notch that similarly protrudes from the lower surface of the cam plate 7, and is disposed in front of the shutoff notch 13 at a predetermined distance l.

Reference numeral 15 denotes a control device consisting of a CPU 15a and a ROM 15b, which drives the motor 1 at high speed when switches S ₁ and S ₂ are ON or OFF, and drives the motor 1 at high speed when switches S 1 and S 2 are OFF, when switches S ₁ and S ₂ are OFF, When it is ON, it is designed to drive at low speed.

16 is turned on by pressing and releasing the pedal 17,
When the startup switch is turned OFF, the CPU 15a turns off the rod 1 of the startup magnet 18 in response to its output signal.
8a can be raised and lowered. 19 connects the chain 2 to the rod 18a of the starting magnet 18.
0, which is always biased counterclockwise in FIG. 4 by a spring 21, and rotates clockwise against the spring 21 when the rod 18a descends It's getting old. Reference numeral 22 denotes a blocking frame (locking member) rotatably held on the side of the sewing machine main body M, which is always biased clockwise in FIG. 4 by a spring 23 around an intermediate point A. The upper end portion 22a is adapted to engage with a groove formed on the side surface of the drive clutch 5 when rotated clockwise, and the lower end portion has stepped locking step portions 22b ₁ , 22b. hook 2 with ₂
2b is formed. Reference numeral 24 denotes a switch operating plate formed in a cam shape and protruding from the cutoff frame 22, and operates the micro switches S ₁ and S ₂ by movement of the cutoff frame 22. A clutch lifter 25 is rotatably supported at a center point b together with the cutoff frame 22, and connects the drive pulley 4 to and away from the drive clutch 5, and is connected to the cutoff frame 22 via a leaf spring 26. Reference numeral 27 denotes a hook release lever as a locking member which is rotatably supported on the sewing machine body M by a shaft 28, and is rotated counterclockwise in FIG. The other end of this lever 27 is provided with a protruding locking pawl 27b that engages with the locking step portion 22b ₁ or 22b ₂ .

Reference numeral 30 denotes an emergency stop operation lever rotatably supported by the shaft 28, which is always supported by a spring 3.
1 in the counterclockwise direction in FIG.
Moreover, this operating lever 30 can be operated by pressing the operating part 30a formed at one end of the operating lever 30.
1 in the clockwise direction in FIG.
7, and the hook release lever 2
7 is moved from a high speed position in a first stage to a cutoff position in a third stage, which will be described later. Furthermore, a hooking portion 30c is formed at the tip of the operating lever 30, and the hooking portion 30c engages with the lower end of the hook 22b of the cutoff frame 22.
, the protrusion 30b moves the unhooking lever 27 from the first stage high speed drive to the second stage, and then to the third stage.
During the stage movement, the isolation frame 22 is positioned against the spring 23 to hold it in the second low speed position.

Note that 32 is a knife that cuts the thread at the end of sewing.

The conventional cycle sewing machine and its drive device are constructed as described above, and in the initial state when the power is turned on, the starting switch 16 is OFF, so the rod 18a of the starting magnet 18 is turned off.
is on the rise. For this reason, the blocking frame 22
The upper shaft 6 is rotated clockwise by the spring 23, and its upper end 22a is engaged with the drive clutch 5 to fix the rotational position of the upper shaft 6. Also, at this time, the switch operating plate 24 presses the micro switch _S2 to turn it on.
Therefore, the motor 1 is driven at low speed, but the clutch lifter 25 rotates to the left together with the cutoff frame 22 to move the drive pulley 3 to the drive clutch 5.
Since the upper shaft is separated from the upper shaft, the driving force of the motor 1 is not transmitted to the upper shaft. Therefore, the cam plate 7 is held at the sewing starting position, and in this state, one end 27a of the hook release lever 27 is in contact with the rear end of the inclined surface 13a of the blocking notch 13 (FIG. 4).

Now, when the pedal 17 is depressed and the starting magnet 18 is turned ON, the rod 18a of the starting magnet 18 is lowered, the starting lever 19 is rotated clockwise, and the cutoff frame 22 is rotated counterclockwise in FIG. do. As a result, the upper end 22a of the cutoff frame 22 is separated from the drive clutch 5, and the switch actuation plate 24 causes the microswitches S ₁ and S ₂ to be activated.
turns ON and OFF to drive motor 1 at high speed. Furthermore, the drive pulley 3 and drive clutch 5 are connected by the clutch lifter 25, the upper shaft 6 rotates, and the cam plate 7 rotates in the direction of arrow a.

When the cam plate 7 starts rotating, the one end 27a of the hook release lever 27 is disengaged from the blocking notch 13 and comes into contact with the lower surface of the cam plate 7 by the force of the spring 28.
At this time, the locking step 22b is moved to the right by the activation magnet 18, so the locking pawl 27b descends to the first stage and engages with the locking step 22b ₁ of the cutoff frame 22. to hold the cutoff frame 22 in the high speed position. (See Figure 5). Therefore, after that,
Even if the pressure on the pedal 17 is released and the activation lever 19 is returned to the initial position, the cutoff frame 22 does not change from the high speed position. Further, the rotation of the cam plate 7 causes the cloth conveying member 12 to move along the groove 7a of the cam plate 7, conveying the cloth, and stitching by a needle (not shown) that moves up and down due to the rotation of the upper shaft 6. is being formed.

When the end of one sewing cycle approaches, the hook release lever 2 that was in contact with the lower surface of the cam plate 7 is released.
7 rides on the low speed notch 14 and moves to the second stage (see FIGS. 6 and 7). That is,
The locking pawl 27b rises and disengages from the locking step _22b1 , and the cutoff frame 22 is slightly rotated counterclockwise by the spring 23, and the locking step _22b2 disengages from the locking step 27.
b and is held at the low speed position. As a result, the cam surface of the switch actuating plate 24 moves from S ₁ to S ₂ and the micro switches S ₁ and S ₂ turn OFF and ON, and the motor 1 is driven at low speed. Thereafter, by rotation of the cam plate 7, one end 2 of the hook release lever 27 is released.
7a moves a length l away from the slow notch 14. At this time, the hook release lever is held in the locking portion. When it reaches the cutoff notch 13, it rides on the inclined surface 13a, and the locking pawl 27b moves to the third stage (see Figures 8 and 9), and is removed upward from the locking step 22b ₂ of the cutoff frame 22. (blocking position). As a result, the cutoff frame 22 rotates clockwise due to the biasing force of the spring 23, and the cam surface of the switch actuating plate 24 moves on S ₂ to activate the micro switch.
S ₁ and S ₂ remain OFF and ON, and motor 1 continues to drive at low speed, but clutch lifter 25
moves clockwise, the drive pulley 4 separates from the drive clutch 5, cutting off the transmission of driving force to the upper shaft 6, and the upper end 2 of the cutoff frame 22
2a fits into the groove of the drive clutch 5, and the upper shaft 6 is held at a predetermined rotational position.

With the above steps, one cycle of sewing operation is completed.

By the way, a case will be described in which, for some reason, it becomes necessary to urgently stop the sewing operation during high-speed or low-speed driving before one cycle of sewing is completed. First, the operation part 3 of the operation lever 30
By pressing 0a downward, it is rotated counterclockwise in FIG. As a result, the hook release lever 27 is moved upwardly from the first stage to the third stage by the protrusion 30b of the operation lever 30, and the locking pawl 27b is moved upwardly from the locking steps 22b ₁ and 2 of the cutoff frame 22.
2b deviates from ₂ . As a result, the cutoff frame 22 rotates slightly due to the biasing force of the spring 23, and as shown in FIG. 10, the locking portion 30c of the operating lever 30 is locked at the second low speed position, and the motor 1 is driven at a low speed. . Thereafter, when the pressing force on the operating portion 30a is released, the operating lever 30 returns to its original position due to the urging force of the spring 31, and the cutoff lever 22 is released.
As a result, the cutoff lever 22 is rotated counterclockwise in FIG. 4 by the spring 23, the clutch 5 is released, and the driving force of the motor 1 is no longer transmitted to the upper shaft. 22a fits into the groove of the drive clutch 5 and the sewing machine stops. In this way, if the operating lever 30 is pressed and released,
The sewing operation can be stopped in an emergency at any time.

Furthermore, if the pressed operation lever 30 is not released and is maintained in that state, the sewing operation can be started at a low speed and continued.

[Problem that the invention attempts to solve]

In the conventional device described above, when attempting to perform one cycle of sewing operation at a low speed, the operator must continue to press the operating lever 30 during that time, which places a great burden on the operator. However, this type of equipment installed for the purpose of automation cannot fully achieve its purpose.

This invention has been made in view of the above-mentioned problems, and aims to provide a drive stop device for a cycle sewing machine that can perform sewing operations at low speed during one cycle without continuously pressing the operating lever. .

[Means for solving problems]

In order to solve the above problem, a locking body is installed to support the operating lever 30 at a position where the hook release lever (locking member) comes into contact with the low-speed notch.

[Example of idea]

An example of this invention is shown below in Figures 1 to 3.
This will be explained based on the diagram. Note that the same or equivalent parts as in the conventional example are given the same reference numerals, and detailed explanation thereof will be omitted. In the figure, reference numeral 33 denotes a locking body consisting of a stopper mount 34 and a low-speed stopper 35 provided at its tip. The stopper mounting base 3
4 is a step screw 36 inserted into the elongated hole 34a,
36, it is movably attached to the side surface of the sewing machine main body M. The low-speed stopper 35 is fixed to the stopper mounting base 34 with screws 37 and 38, and by moving the stopper mounting base 34 in the direction of arrow A, the operating lever 30 that is pressed downward is engaged. It has become possible to stop it. The locking position of this operating lever 30 is at the protrusion 3.
0, the locking pawl 27b is at a low speed position, and the locking portion 30c is at a position where it does not hinder the movement of the hook 22b. Note that the low-speed stopper 35 has an arc-shaped long hole 35a through which one of the screws 38 is inserted, and the attachment position to the stopper mounting base 34 can be finely adjusted within the range of this long hole 35a. ing. Further, 39 is a V-shaped bent portion 39 at the rear end.
a, and the step screws 36, 3
The locking body 33 is fixed to the side surface of the sewing machine main body M at 6, and the locking body 33 slides on one side surface of the leaf spring 39. Then, the bent portion 3 of the leaf spring 39
9a fits into the V time groove 34b carved in the stopper mounting base 34 when the locking body 33 moves forward, and holds the locking body 33 in the backward movement position.
When the stopper mount 34 moves forward, it comes off the V-time groove 34b and comes into contact with the rear end of the stopper mount 34, thereby restricting the rearward movement of the stopper mount 34.

Note that the other configurations are the same as those of the conventional example.

Next, the action will be explained.

If the sewing operation is to be performed at low speed throughout one sewing cycle, first push down the operating portion 30a of the operating lever 30, advance the locking body 33 in this state, and move the low speed stopper 35 to the operating lever 3.
0 to the locking position.

As a result, the protrusion 30b has the locking claw 27b in the second position.
The base portion 27c is moved to the position corresponding to the stage position.

Here, operate the pedal 17 to close the cutoff frame 2.
2 is set to the high speed position and the motor 1 is driven, the cam plate 7 rotates, one end 27a of the hook release lever 27 comes off the cutoff notch 13, and the hook release lever 27 is rotated counterclockwise by the spring 29. The base portion 27c comes into contact with the protrusion portion 30b. At this time, the locking pawl 27b is held at the second stage low speed position. After that, when the depressed pedal 17 is released, the cutoff frame 22 is moved to the hook 22b by the spring 23.
contacts the locking pawl 27b and moves from the first high speed position to the second low speed position, and the micro switches S ₁ and S ₂
is switched from ON and OFF to OFF and ON, and the motor 1 is switched from high-speed drive to low-speed drive, and thereafter, sewing continues with low-speed drive. When the sewing reaches the end position, one end 27a of the hook release lever 27 rides on the blocking notch 13, and the locking claw 27
b moves to the third stage and disengages from the locking step 22b ₁ of the blocking frame 22. As a result, the cutoff frame 22 is rotated by the spring 23, and the upper end 27a
is fitted into the groove of the drive clutch 5, the upper shaft 6 is fixed at a predetermined rotational position, and the sewing machine is stopped.

As described above, by moving the locking body 33 forward, low-speed sewing can be performed.
When sewing is performed by switching from high-speed drive to low-speed drive and then stopping, it is sufficient to move the locking body 33 backward, and in the event of an emergency stop, the locking pawl can be opened by pressing the operating lever 30 as before. 27b is raised to the cutoff position and the low speed position is supported by the hook, the operation lever is released to disengage the hook from the hook 22b.

Also, in the above explanation, the activation lever was moved up and down by the activation magnet by operating the pedal, but
The pedal 17 and the activation lever 19 may be connected with a chain.

Furthermore, the position of the protrusion 30b of the operation lever 30 is supported by the locking body 33 at a position corresponding to the low speed of the base 27c, and the hook release lever (locking member) is set using a member corresponding to the protrusion 30b as a locking body. It may be arranged so that it comes into contact with.

[Effect of idea]

As explained above, according to this invention, the locking body can be operated without continuously pressing the operating lever.
Since the sewing operation during the sewing cycle can be maintained at a low speed, the burden on the operator can be significantly reduced, and this has a great effect on automation and labor saving of the sewing process.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of this invention, Fig. 2 is a side view showing the operating state of the device shown in Fig. 1, and Fig. 3 is a bottom view of the main part of the device shown in Fig. 1.
Fig. 4 is a side view showing a drive control device of a conventional cycle sewing machine, Fig. 5 is a partially enlarged side view of the device shown in Fig. 4, and Figs. 6 to 9 are normal views of the device shown in Fig. 6. FIG. 10 is a partially enlarged side view showing the operating lever in a pressed state in the sewing machine shown in FIG. 4. 7... Cam plate, 12... Fabric conveyance member (fabric conveyance means), 13... Shutoff notch, 14... Low speed notch,
17...Pedal, 15...Control device (control means),
27...Hook release lever (locking member), 30...
...operation lever, 22... cutoff lever (locking member),
33...Locking body.

Claims (1)

[Claims for Utility Model Registration] A cam plate 7 that rotates in conjunction with the main shaft 6 of the sewing machine so as to drive the cloth conveying means 12, and is provided with a low speed notch 14 at a low speed start position and a cutoff notch 13 at a cutoff position; switches S ₁ and S ₂ connected to the control means 15 of the motor 1 that rotates the sewing machine main shaft 6 and capable of switching the motor 1 to high-speed rotation or low-speed rotation; and one end disposed so as to be able to come into contact with and separate from the cam plate 7. Part 2
7a, and the one end 27a is attached to the sewing machine so as to be movable in one direction or the other direction by contacting with the cam plate 7, the low speed notch 14 or the shutoff notch 13, and the switch is changed in relation to this movement. and locking members 22, 23, 24, 27 that can be held.
and locking bodies 30, 3 supporting the locking member at a corresponding position where the locking member is moved by the low speed notch.
3, and activation means 16 to 21 for moving the locking member in one direction and switching the switch to high-speed rotation.
A drive stop device for a sewing machine, comprising: and.