JPH0155811B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a brake release mechanism for a brake device.

[Prior art]

FIGS. 1 and 2 are cross-sectional views showing an example of a brake operating state and a brake releasing state of a conventional brake release mechanism. 1 is a rotary plate attached to the rotating shaft of the motor M, 2 is a brake lining that is joined to and detached from the rotary plate 1, 3 is an armature to which the brake lining 2 is attached, and 4 is a rotary plate that allows the armature 3 to move freely in the suction direction. It is a pin that is fixed in the direction of rotation. 5 is a spring for pressing the brake lining 2 against the rotary plate 1; 6 is an electromagnet for attracting the armature 3; 7 is a shaft connected to the armature 3 at its center; 8 is the shaft 7.
This is a cam lever that is connected to the shaft 7 and has a cam for moving the shaft 7 in the axial direction. 9 is a spring for returning the shaft 7 to the neutral position, and 10 is a shim for adjusting the connection position between the shaft 7 and the armature 3. As shown in FIG. 1, when the cam lever 8 is located in the horizontal direction, that is, in the axial direction, the shaft 7 is adjusted so as not to be connected to the armature 3. Therefore, when the electromagnet 6 is not energized, the rotating plate 1 and the brake lining 2 are fixed by friction torque caused by the pressing force of the spring 5. When the electromagnet 6 is excited, the armature 3 is attracted to the electromagnet 6 against the pressing force of the spring 5, the brake lining 2 is separated from the rotating plate 1, and the rotating plate 1 rotates freely. On the other hand, when the electromagnet 6 is de-energized, the brake lining 2 is again pressed against the rotating plate 1 by the pressing force of the spring 5 and operates as a brake.
During this braking operation, when the cam lever 8 is tilted perpendicular to the axial direction as shown in FIG. The electromagnet 6 is moved in the direction ○a against the pressing force of the spring 5 to release the braking action.

The brake release mechanism of the conventional brake device constructed as described above has the following drawbacks.

(1) Space is required for the cam lever 8 to rotate in the axial direction, and the overall length of the brake release mechanism becomes longer in the axial direction.

(2) If the pressing force of the spring 5 becomes strong, a large amount of force is required to operate the cam lever 8, making the operation difficult.

(3) If the spring 5 is tilted, the armature 3 will also tilt when the brake is released, and the brake lining 2 will not be completely detached from the rotating plate 1, which may cause damage to the brake lining 2.

[Summary of the invention]

The present invention has been made to solve the above-mentioned drawbacks, and has a brake release mechanism that has a short overall length, is compact, is easy to operate, and can perform brake operations reliably without damaging the brake lining. In order to obtain a brake release mechanism that can be used, a plurality of brake release mechanisms are arranged in the circumferential direction of the rotary plate, and a lug provided on the shaft of the brake release mechanism is engaged with the peripheral edge of the armature of the brake device to perform the braking action. The present invention provides a brake release mechanism characterized by the following features.

[Embodiments of the invention]

3 and 4 are a plan view and a longitudinal sectional view showing an example of a brake operating state of the brake release mechanism according to the present invention, and FIG. 5 is a longitudinal sectional view showing an example of a brake releasing state. Note that parts having the same functions as those in FIGS. 1 and 2 are given the same symbols, and explanations thereof will be omitted. 1
1 is a lug fixed to the shaft 7 with a screw and has an L-shaped cross section and engages with the peripheral edge of the armature 3; 12 is a housing that fixes the brake release mechanism in the circumferential direction of the rotating plate 1; A plurality of such brake release mechanisms are arranged in the circumferential direction of the rotary plate 1.

The effects of the present invention configured as described above are as follows. As shown in Figure 3, the cam lever 8
is located in the axial direction, the lug 11 fixed to the shaft 7 is not engaged with the armature 3. Therefore, when the electromagnet 6 is not energized, the rotary plate 1 and the brake lining 2 are fixed by friction torque caused by the pressing force of the spring 5. When the electromagnet 6 is excited, the armature 3 is attracted to the electromagnet 6 against the pressing force of the spring 5, the brake lining 2 is separated from the rotating plate 1, and the rotating plate 1 rotates freely. On the other hand, when the electromagnet 6 is de-energized, the brake lining 2 is again pressed against the rotating plate 1 by the pressing force of the spring 5 and operates as a brake.

When the cam lever 8 is tilted perpendicularly to the axial direction as shown in FIG. 5 during this braking operation, the lug 11 fixed to the shaft 7 moves in the direction of the electromagnet 6 and engages with the armature 3. The armature 3 is moved in the direction of the electromagnet 6 against the pressing force of the spring 5 to release the braking action.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the following remarkable effects can be achieved.

(1) No space is required for the cam lever provided at the shaft end to rotate, making the overall length shorter and more compact.

(2) Since the rotating plate can be moved one side at a time, the operating force is small.

(3) Since the peripheral edge of the rotating plate is moved by multiple lugs, the rotating plate is unlikely to tilt, and the brake lining is completely detached from the rotating plate, ensuring reliable braking without damaging the brake lining due to dragging. .

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing an example of a conventional brake release mechanism, and FIGS. 3, 4, and 5 are plan views, longitudinal cross-sectional views, and longitudinal cross-sectional views showing embodiments of the present invention. be. Note that the same reference numerals in the figures indicate the same or equivalent parts. 1... Rotating plate, 2... Brake lining, 3
... Armature, 5, 9 ... Spring, 6...
...Electromagnet, 7...Shaft, 11...Lug, 12
……housing.

Claims (1)

[Claims] 1. In a brake release mechanism of a brake device, the brake lining is separated from the rotary plate by attraction of the electromagnet when the electromagnet is energized, and the brake lining is pressed against the rotary plate by a spring when the electromagnet is demagnetized to perform a braking action. A brake release mechanism characterized in that a plurality of are arranged in the circumferential direction of a rotating plate, and a lug provided on a shaft of the brake release mechanism is engaged with a peripheral edge of an armature of a brake device to perform a braking action.