JPH0737069U - Clutch motor for sewing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the clutch plate of the sewing machine from becoming in contact with the flywheel and the brake shoes when not operating. [Structure] Flywheel 2 fixed to output shaft 1a of motor body 1 and brake shoe 6 fixed to frame 3.
A neutral spring 9 whose spring force is set so as not to contact the clutch plate 5 is provided between the frame 3 and the clutch plate operating lever 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a clutch motor for driving a main shaft of a sewing machine and various mechanisms transmitted from the main shaft.

[0002]

[Prior art]

 As a clutch motor, the one shown in FIG. 3 is conventionally known. In the clutch motor, a flywheel 2 is fixed to an output shaft 1a of a motor body 1 that constantly rotates, and a clutch plate 5 is rotatably supported by a movable bearing 4 which is supported by a motor frame 3 so as to be movable in an axial direction. The operation lever 7 for moving the movable bearing 4 in the axial direction is urged by the operation lever return spring 8 to press the clutch plate 5 against the brake shoe 6. Therefore, when the operation lever 7 is not operated, the clutch plate 5 is pressed against the brake shoe 6 and the motor pulley 10 is stopped. Then, by pushing down the operation lever 7, the clutch wheel 5 comes into contact with the flywheel 2 and the motor pulley 3 rotates.

[0003]

[Problems to be solved by the device]

 By the way, in the sewing machine, the vertical position of the needle when handling the cloth becomes a problem. For example, when the cloth is taken out of the sewing machine after sewing, the needle must come out of the cloth and be positioned at the upper position. I must be stuck. However, when the above-mentioned clutch motor is used in a sewing machine, it is not clear at which position the needle will stop when the operating lever 7 is released by pushing it down and then stopped. Therefore, when handling cloth, it is necessary to manually rotate the sewing machine pulley 10 to change the vertical position of the needle to a position suitable for sewing.

However, in the above clutch motor, when the sewing machine pulley 10 is stopped, the clutch plate 2 is strongly pressed against the brake shoe 6 by the force of the operation lever return spring 8, so the sewing machine pulley 10 is It cannot be easily turned. However, it is also possible to push down the operating lever 7 a little and move the clutch plate 5 to a position where neither the flywheel 2 nor the brake shoe 6 comes into contact (this state is called neutral), and the handwheel force of the sewing machine pulley 10 can be facilitated. Although it is possible, pushing down the operating lever 7 is a delicate operation that requires skill. If it is pulled down too much, the clutch plate 5 contacts the flywheel 2 and the sewing machine pulley 10 starts to rotate at high speed, which is dangerous. .

An object of the present invention is to make the clutch plate of the sewing machine neutral so that the clutch plate does not come into contact with the flywheel or the brake shoe when the clutch motor is not operated.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the clutch motor for a sewing machine of the present invention uses a spring force so that the clutch plate does not come into contact with either the flywheel fixed to the output shaft of the motor body or the brake shoe fixed to the frame. The neutral spring with the above setting is provided between the frame and the clutch plate operating lever.

[0007]

[Action]

 In the sewing machine clutch motor configured as described above, the clutch plate operating lever and the clutch plate are held in neutral by the balance between the operation lever return spring and the neutral spring. If the operating lever is pushed down from that state and the clutch plate is pressed against the flywheel that is constantly rotating, the sewing machine will rotate. When the operation lever is released, the operation lever returns to neutral, but the clutch plate and the sewing machine pulley continue to rotate due to inertia, and when the operation lever is pushed up and the clutch plate is applied to the brake shoe, the inertia rotation of the clutch plate and the sewing machine pulley occurs. Stops. When you release your hand after that, the operating lever and clutch plate become neutral, and you can freely rotate the sewing machine.

[0008]

【Example】

 A clutch motor for a sewing machine according to the present invention will be described with reference to FIGS. 1 and 2.

This sewing machine clutch motor includes a motor body 1 that constantly rotates, a flywheel 2 fixed to an output shaft 1a of the motor body 1, and a movable bearing 4 supported by a motor frame 3 so as to be axially movable. A clutch plate 5 rotatably supported by the movable bearing 4, a brake shoe 6 fixed to the motor frame 3 for stopping the clutch plate 5, and an operation for moving the movable bearing 4 in the axial direction. The neutral spring 9 is provided in the clutch motor including the lever 7 and the operation lever return spring 8 for urging the operation lever 7 in the direction of pressing the clutch plate 5 against the brake shoe 6. FIG. 1 is a diagram when the clutch plate 5 is in neutral.

The neutral spring 9 is a compression vane provided between the motor frame 3 and the operating lever 7. The strength thereof is set so that the clutch plate 5 becomes neutral so as not to contact the flywheel 2 and the brake shoe 6 when an external force is not applied to the operation lever 7, and is stronger than the force of the operation lever return spring 8. The neutral spring 9 and the operating lever return spring 8 are balanced by turning the adjusting screw 11 to adjust the strength of the operating lever return spring 8.

The neutral spring 9 can also be attached to the operation lever 7, as shown in FIG. The neutral spring 9 may be attached to the motor frame 3 side.

In FIG. 2, the mounting board 12 is attached to the operating lever 7 by the set screw 13 through the elongated hole 12a so that the position of the operating lever 7 can be adjusted in the vertical direction. A pin 14 which is slidably inserted in the direction and to which the E-ring 15 is fixed; and a neutral spring 9 provided around the pin 14 between the E-ring 15 and the lower support 12b. .

2 is exactly the same as that shown in FIG. 1 except that the force of the neutral spring 9 acts between the motor frame 3 and the operating lever 7 via the pin 14.

In the sewing machine clutch motor configured as described above, when the sewing machine is driven, the pedal is stepped forward to push down the operation lever 7 from neutral, and the clutch plate 5 is moved to the flywheel 2 which is constantly rotating. Press down. When the pushing down of the operating lever 7 is released, the operating lever 7 returns to neutral, but the clutch plate 5 and the sewing machine pulley 10 continue to rotate due to inertia. To stop the inertial rotation, depress the pedal backwards and push up the neutral operation lever 7 to put the clutch plate 5 on the brake shoe 6. When the hand is released after the sewing machine stops, the operating lever 7 and the clutch plate 5 become neutral, and the sewing machine pulley 10 can freely rotate.

[0015]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects.

That is, the clutch plate can be made neutral when the clutch plate operating lever is not operated, the sewing machine pulley can be freely turned with a small force, and the sewing machine can be rotated at high speed as in the conventional case. Also disappears. Therefore, workability and safety are significantly improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a clutch motor for a sewing machine according to the present invention.

FIG. 2 is a front view showing another mode of the neutral spring in the sewing machine clutch motor of the present invention.

FIG. 3 is a cross-sectional view of a conventional sewing machine clutch motor.

[Explanation of symbols]

 1 Motor Main Body 2 Flywheel 3 Motor Frame 4 Movable Bearing 5 Clutch Plate 6 Brake Shoe 7 Operating Lever 8 Operating Lever Return Spring 9 Neutral Spring 10 Sewing Machine Pulley

Claims (1)

[Scope of utility model registration request] 1. A neutral spring for setting a spring force so that the clutch plate does not come into contact with either the flywheel fixed to the output shaft of the motor body or the brake shoe fixed to the frame, and a lever for operating the frame and the clutch plate. A clutch motor for the sewing machine installed between the and.