JPH0343472Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a friction brake mechanism for a rotating body.
More specifically, the present invention relates to a friction brake mechanism for a rotating body that automatically controls ON/OFF of braking.

(Prior art and its problems) This type of friction brake mechanism has one end fixed and a brake shoe fixed to the rotating body contact area, and a gear head motor connected to the other end of the brake arm. The brake shoe is configured to swing the end of the arm within a range set by a pair of limit switches or the like to bring the brake shoe into contact with or away from the outer peripheral surface of the rotating body.
In this case, when adjusting the pressing friction force of the brake shoe against the rotating body, it is necessary to change the installation position of the limit switch and the like. However, since this type of limit switch etc. is usually built into a device, it is not easy to change its setting position once it is built in.

Therefore, when incorporating it into equipment such as equatorial mounts for astronomical telescopes, where the pressing friction force of the brake shoe fluctuates due to large changes in temperature conditions caused by the usage environment, it is necessary to incorporate a clutch mechanism into the motor with a gear head. The arm swing range is set to the maximum in advance, and even within the set arm swing range, the rotational force of the motor is not transmitted to the gear head when a load exceeding a predetermined value is applied. As a result, a braking function based on a predetermined frictional force is maintained.

However, with this configuration, the incorporation of the clutch mechanism increases the size and complexity of the gear head motor, which has the disadvantage of increasing the cost and weight of the mechanism. Furthermore, when setting the clutch actuation level, it is difficult to reflect the delicate level of frictional force that the operator intuitively perceives.

(Purpose of the invention) In view of the above-mentioned circumstances, the present invention makes it possible to maintain the braking function by the desired frictional force without increasing the cost and weight of the mechanism, and also allows the operator to feel The purpose of the present invention is to provide a friction brake mechanism for a rotating body that enables adjustment based on a delicately known friction force level.

(Structure of the invention) Therefore, the friction brake mechanism according to the invention includes a brake arm made of a steel plate to which a brake shoe that contacts the outer peripheral surface of a rotating body is fixed, and a gear head on the swinging end side of the brake arm. A motor with a gear head is connected to each adjustment screw on the base end side, and a pair of sensors installed at a predetermined interval regulates the swinging of the swing end side by the motor with a gear head.
It is configured to change the position of the proximal end using an adjustment screw.

(Embodiment of the invention) In the first and second illustrated friction brake mechanisms, the rotating body 1
A base end 2 of a steel plate brake arm 2 to which a hard rubber brake shoe 21 is fixed, which abuts on the outer peripheral surface of the steel plate brake arm 2.
Flange bars 22, 23 are provided at the a and swinging ends 2b, respectively.
are installed so that they can rotate relative to each other. Each flange bar 22, 23 is provided with a through hole 22a, 23a, which has a spiral inner peripheral surface.
A threaded portion 3a of an adjustment pin 3 attached to the fixed frame 5 and a head gear 4a of a motor 4 with a gear head are screwed into the screws 2a and 23a, respectively. A pair of limit switches 61 and 62 are installed on the swinging end 2b side of the brake arm 2 to restrict the range of swing of the arm 2. When the motor 4 with a gear head is started by a switch (not shown), the arm 2 is the limit switch 61,
62 is turned ON, the operation of the motor 4 is stopped.

In the brake mechanism configured in this way, from the state shown in the figure, that is, the brake OFF state in which the limit switch 62 is turned on by the swinging end 2b of the arm 2, the gear head motor 4 is started to move the swinging end 2b of the arm 2a. Limit switch 61 is ON
By swinging in the _x1 direction to a position where the brake shoe 21 comes into contact with the outer circumferential surface of the rotating body 1 with a predetermined pressing friction force, the brake shoe 21 shifts to the brake ON state. Further, by rotating the gear head motor 4 in the reverse direction from this ON state, the brake is returned to the illustrated state, that is, the brake OFF state. Since the brake arm 2, which is a swinging member, is made of steel plate, even if the dimensions of each component change due to temperature differences, the dimensional difference is absorbed by the elastic deformation of the steel plate arm 2, and the brake arm 2 is made of steel. 21 causes no fluctuation in the pressing frictional force acting on the rotating body 21.

If the elastic deformation of the steel plate arm 2 exceeds the range that can be absorbed, the position of the proximal end 2a of the brake arm 2 can be changed in the _y1 direction by manually operating the adjustment screw 3. You 2
1 and the outer peripheral surface of the rotating body 1, it becomes possible to maintain a desired pressing friction force. In particular, when operating the adjustment screw 3, the desired pressing friction force can be confirmed by the operator's sense of touch, so that it is possible to make adjustments at delicate levels of the friction force.

FIG. 2 shows another embodiment of the present invention, in which a brake arm 302 is formed in an arc shape along the outer peripheral surface of the rotating body 1, and rotates the head gear 4a of the gear head motor 4 screwed onto the flange bar 323. The flange bar 324 is moved up and down to swing the arcuate arm 302 in the direction of the arrow _x3 , thereby bringing the brake shoe 321 into contact with or away from the outer peripheral surface of the rotating body 1, and at the same time operating the adjustment screw 3. By doing so, the arcuate arm 302 moves in the direction of arrow _y3 via the flange bar 322, and the arm 3
02 is changed, and the distance between the brake shoe 321 and the outer peripheral surface of the rotating body 1 is changed. In this embodiment, a detection plate 324 is provided on the swinging end 302b side of the arm 302.
is installed in a protruding manner, and the limit switches 61 and 62 are operated by this plate 324.

FIG. 4 shows a modification of the third embodiment, in which a nut 400 and a spring 40 are installed between the flange bar 323 and the head gear 4a of the motor 4 with a gear head.
1, the arcuate arm 302 is moved up and down by changing the relative position between the nut 400 and the head gear 4a, and the occurrence of dimensional errors in each component is first absorbed by the elastic force of the spring 401. It is something. In this modification, the detection plate 402 that comes into contact with the limit switches 61 and 62 is attached to the outer periphery of the nut 400.

In this configuration, the spring 40
1 elastic deformation, elastic deformation of the steel plate arm 302,
Since the desired pressing friction force is maintained by the three members including the base end position adjustment using the adjustment pin 3, it becomes possible to deal with a wider range of dimensional errors.

(Effects of the invention) According to the brake mechanism for a rotating body according to the invention as described above, even if braking ON/OFF control is performed automatically, the size of the mechanism increases and the cost increases accordingly. - It is possible to maintain the braking function by the desired frictional force without causing an increase in weight, and it also enables the operator to adjust the frictional force at a delicate level that can be grasped intuitively.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a friction brake mechanism for a rotating body according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a schematic configuration diagram showing another embodiment of the present invention. FIG. 4 is a schematic configuration diagram showing a modification thereof. 1... Rotating body, 2... Brake arm, 21...
... Brake shoe, 2a ... Swinging end, 2b ... Base end, 3 ... Adjustment screw, 4 ... Motor with gear head, 61, 62 ... Limit switch.

Claims (1)

[Scope of utility model registration request] The brake arm, which has a brake shoe attached to it that contacts the outer circumferential surface of the rotating body, is formed from a steel plate, and
A motor with a gear head is connected to the swinging end of the brake arm, and an adjustment screw is connected to the base end, and a pair of sensors installed at a predetermined interval regulates the swinging of the swinging end by the motor with a gearhead. A friction brake mechanism for a rotating body, characterized in that the position of the proximal end is changed using an adjustment screw.