Braking device for a rotary motor including a compression spring and piezoelectric element

• US 5,039,900 A
• Filed: 02/15/1990
• Issued: 08/13/1991
• Est. Priority Date: 02/15/1989
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Okuma Tekkosho
• Original Assignee: Kabushiki Kaisha Okuma Tekkosho
• Inventors: Itani, Yuichi, Nashiki, Masayuki
• Primary Examiner(s): Budd, Mark O.
• Assistant Examiner(s): Dougherty, Thomas M.
• Application Number:
  US07/480,540
• Time in Patent Office: 544 Days
• Field of Search: 310/328, 310/77
• US Class Current: 310/328
• CPC Class Codes: F16D 2121/28 using electrostrictive or magnetostrictive elements, e.g. piezoelectric elements
• CPC Class Codes: F16D 49/00 Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like similar clutches F16D13/10
• CPC Class Codes: F16D 59/02 spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
• CPC Class Codes: H02K 7/102 with friction brakes

Abstract

A braking device for a rotary motor includes a braking member movably mounted to a non-rotating member of the rotary motor. The braking device further includes a compression spring coupled to the braking member for exerting a force on the braking member to cause the braking member to contact a rotating member of the rotary motor. The braking device further includes a piezoelectric element for actuating in response to a signal applied thereto to exert a force on the braking member to counteract the force applied to the braking member by the compression spring so as to cause the braking member to separate from the rotating member of the rotary motor.

Claims

1. A braking apparatus for a rotary device, the rotary device including a rotating member and a non-rotating member, said braking apparatus comprising:

a braking member movably mounted to the non-rotating member of the rotary device;

compression means, mounted to the non-rotating member and coupled to said braking member, for exerting a first force on said braking member to cause said braking member to contact the rotating member of the rotary device; and

fine movement means, mounted to the non-rotating member, for actuating in response to a signal applied thereto to exert a second force on said braking member, the second force of said fine movement means counteracting the first force of said compression means to cause said braking member to separate from the rotating member.

2. A braking apparatus as recited in claim 1, wherein said braking member is slidably in a direction which is perpendicular to a rotational axis of the rotating member.

3. A braking apparatus as recited in claim 1, wherein said compression means and said fine movement means are mounted to the non-rotating member at substantially opposite sides of a rotational axis of the rotating member.

4. A braking apparatus as recited in claim 2 wherein said compression means and said fine movement means are mounted to the non-rotating member at substantially opposite sides of the rotational axis of the rotating member.

5. A braking apparatus as recited in claim 1, wherein said compression means includes a compression spring.

6. A braking apparatus as recited in claim 2, wherein said compression means includes a compression spring.

7. A braking apparatus as recited in claim 3, wherein said compression means includes a compression spring.

8. A braking apparatus as recited in claim 4, wherein said compression means includes a compression spring.