JPH03293948A - Brake motor - Google Patents

Abstract

PURPOSE:To obtain a compact brake motor inexpensively in simple structure by constituting a brake while a plate spring is in contact with a brake shoe and by cancelling the brake by deforming the plate spring when a rotary part rotates itself. CONSTITUTION:A rotary part 3 is provided at a spindle 1 through a bearing 2 so that is can freely rotate. A plate spring 6 is mounted to the rotary part 3 so that a plate spring 6 is curved in outer-diameter direction and this curved lower part 7 is in contact with a brake shoe 8 which is formed on an inner periphery of a frame 5. An arm 9 which is fixed to the spindle 1 is installed on a curved inside of the plate spring 6. The rotary part 3 rotates, the plate spring 6 is deformed when the plate spring 6 pushes an arm 9 in rotary direction, a curved part 7 of the plate spring 6 leaves the brake shoe 8, and the spindle 1 is rotated through the arm 9. When the arm 9 tries to rotate the plate spring 6 through the spindle 1 due to generation of inverse load, the plate spring 6 prevents revolution of the spindle 1 by allowing the curved part 7 to contact the brake shoe 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brake motor for operating a curtain or the like wrapped around a boob.

[Prior Art] A brake motor that winds up a curtain or the like can be used to roll up or lower the curtain while the driver is driving the booth.

However, when the drive body stops, if the drive body does not have a brake, the weight of the curtain or the like causes the pulley to rotate the drive body, causing the curtain to come down by itself.

Therefore, this type of drive body is always equipped with a brake.

[Problems to be solved by the invention]However, if a brake such as an electromagnetic brake is built internally in the drive body, the outer diameter of the pulley will become large,
Alternatively, the addenda became more complex and heavier, leading to problems such as higher manufacturing costs.

The present invention was made in view of these circumstances, and
It is an object of the present invention to provide a brake motor configured such that the outer diameter of the pulley is small and the #l construction is simple.

[Means for Solving the Problems] The present invention provides a rotating part of a driving body with a leaf spring, bending the leaf spring in the outer radial direction, and connecting a brake shoe with which the curved part comes into contact with a fixed part of the driving body. The problem is solved by configuring that an arm connected to a pulley carrying a load extends inside the curved portion of the leaf spring, and pushing the leaf spring in the rotational direction with the arm.

[Function] When the rotating part of the drive body is stopped and does not rotate, when the pulley tries to rotate due to the weight of the load such as the curtain, a reverse load occurs such as the arm pushing the leaf spring, but this reverse load does not become large. As long as the curved portion of the leaf spring does not separate from the brake shoe, the rotating portion of the drive body does not rotate.

Therefore, if the pulley is rotated by a reverse load,
As long as the reverse load does not become large, the rotating portion of the drive body is fixed in contact with the brake shoe via the leaf spring, and the boot can be fixed against the reverse load.

In addition, when the rotating part of the M moving body is rotated to rotate the pulley, the rotation of the rotating part causes the arm to be pushed by the leaf spring, and the leaf spring deforms and extends in the rotational direction, so the outer diameter direction The curved portion of the leaf spring that had been curved away from the brake shoe allows the rotating portion to rotate.

At this time, the difference in torque that occurs between the leaf spring and the arm is greater when the rotating part rotates by itself and when rotating the goo side arm due to a reverse load. Become.

That is, although the reverse load and the positive load originally have the same torque, the positive load becomes larger than the reverse load because of the torque transmission loss to the pulley and the need for power to move the load such as the curtain.

Therefore, when the rotating portion rotates by itself, the plate spring can be easily deformed by the arm to release the brake by the plate spring.

[Embodiment] The present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is a longitudinal cross-sectional view of a main part of a brake motor showing an embodiment of the present invention, and Fig. 2 is a longitudinal cross-sectional view of a main part of a brake motor showing an embodiment of the invention. FIG.

In FIG. 1, the brake motor includes a rotating portion 3, which constitutes a driving body, rotatably provided on a shaft 1 via a bearing 2. As shown in FIG.

A fixed portion 4 constituting a driving body is formed on the outer periphery of the rotating portion 3, and this fixed portion 4 is covered and fixed by a frame 5.

Further, a leaf spring 6 is attached to the rotating portion 3 so as to be curved in the outer diameter direction, and this curved lower portion 7 is in contact with a brake shoe 8 formed on the inner periphery of the frame 5.

An arm 9 fixed to the shaft 1 extends from the curved inside of the leaf spring 6, and the arm 9 is formed in a T-shape and is configured to come into contact with the inside of the leaf spring 6.

The arm 9 is connected via the shaft 1 to a pulley 10 provided on the outer circumferential side.

Further, the connection between the arm 9 and the pulley 10 is through a speed reducer 81111 (not shown), and the rotation of the shaft 1 is slowed down to several tenths of the speed to rotate the pulley 10. .

In FIG. 2, the brake motor has a reduction mechanism 1 on the shaft 1.
A pulley 10 is provided through the pulley 1, and a load such as a curtain (not shown) is wound around the pulley 10, and the pulley 10 is elongated in the axial direction.

The arm 9 is fixed to the shaft 1, and the leaf spring 6
When the shaft 1 rotates or the rotating portion 3 rotates, the arm 9 pushes the leaf spring 6 in the rotational direction.

Furthermore, the fixed part 4 is provided with a winding 12 and is connected to a power source (not shown), forming a driving body capable of rotating the rotating part 3.

In such a configuration, in the brake motor, when power is supplied from the power supply to the winding 12 of the fixed part 4 constituting the driving body, the rotating part 3 rotates and the leaf spring 6 rotates.

The rotation of the leaf spring 6 pushes the arm 9 in the rotational direction, that is, the position of the arm changes as shown by the dotted line in FIG. Move away from Shoe 8.

The reason why the curved portion 7 of the leaf spring 6 separates from the brake shoe 8 in this way is because the arm 9 is inside the curved portion 7 of the leaf spring 6 and pushes the leaf spring 6 in the rotational direction to deform it. This is because the curved leaf spring 6 is deformed in the rotational direction, and its curved portion 7 is biased toward the inner diameter side.

As the curved portion 7 separates from the brake shoe 8 in this way, the rotation of the rotating portion 3 rotates the shaft 1 via the arm 9.

Therefore, the pulley 11 is rotated via the reduction mechanism 12,
A load such as a curtain (not shown) will be moved.

Further, when the rotating part 3 does not rotate, if a reverse load occurs such as a load such as a curtain rotating the pulley 11, this reverse load rotates the shaft 1 via the deceleration mechanism 12,
Arm 9 attempts to rotate leaf spring 6.

However, since the curved portion 7 of the leaf spring 6 is in contact with the brake shoe 8 and cannot be rotated, the pulley 11 cannot be rotated.

However, if this reverse load increases, the arm 9 will strongly press the leaf spring 6, causing the leaf spring 6 to deform and separate from the brake shoe 8.

In this case, since the rotating portion 3 rotates, there is a limit to stopping the reverse load.

Therefore, if the limit of braking against such a reverse load is exceeded, the pulley 10 will rotate and the load such as the curtain will move.

However, such a large load can be sufficiently resisted as long as a large force is not generated on the arm 9, such as by forcibly pulling the curtain.

[Effects of the Invention] According to the present invention, the brake can be manufactured in-house with a simple structure by providing a leaf spring that resists reverse loads, and there is no factor that increases the manufacturing cost, and an inexpensive and small brake motor can be obtained. can be done, and the effect is extremely large.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main parts of a brake motor showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view thereof. 1...shaft, 2...bearing, 3...rotating part,
4... Fixed part, 5... Frame, 6... Leaf spring, 9... Arm, 10... Pulley.

Claims (1)

[Claims] The rotating portion of the driving body is provided with a leaf spring, the fixed portion of the driving body is provided with a brake shoe that curves the leaf spring in the outer radial direction and the curved portion contacts, and the arm connected to the pulley carrying the load is provided with a brake shoe that curves the leaf spring in the outer radial direction. A brake motor characterized in that the brake motor is configured to extend inside a curved portion of a leaf spring, and to push the leaf spring in a rotating direction with the arm.