Feed unit for moving parts

• US 6,427,897 B2
• Filed: 12/08/2000
• Issued: 08/06/2002
• Est. Priority Date: 06/09/1998
• Status: Expired due to Term

• Current Assignee: Hesse GmbH
• Original Assignee: HESS & Knipps GmbH
• Inventors: Hesse, Hans Jürgen, Wallaschek, Jörg, Walther, Frank
• Primary Examiner(s): Dunn, Tom
• Assistant Examiner(s): PITTMAN, ZIDIA T
• Application Number:
  US09/733,890
• Publication Number:
  US 20010000613A1
• Time in Patent Office: 606 Days
• Field of Search: 228/1.1, 228/4.5, 228/44.3, 228/44.7, 228/49.1, 228/49.5
• US Class Current: 228/1.1
• CPC Class Codes: B23K 20/00 Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H02N 2/043 Mechanical transmission means, e.g. for stroke amplification

Abstract

A feed unit for moving parts over short distances has a four-bar chain forming a translating solid parallelogram having two parallel rigid opposite legs, one of which constitutes a base leg, connected to one another by elastic elements and a piezoelectric stack translator extending between and flexibly connected to the rigid legs for articulation relative to the rigid legs and oriented at an angle of incidence (α) with respect to a base leg that is less than 90° and greater than 45°.

Claims

1. A feed unit for moving parts over short distances, comprising a four-bar chain forming a translating solid parallelogram having two parallel rigid opposite legs, one of which constitutes a base leg, connected to one another by elastic elements, and a piezoelectric stack translator extending between and flexibly connected to the rigid legs for articulation relative to the rigid legs and oriented at an angle of incidence (α

) with respect to a base leg that is less than 90° and

greater than 45°

.

2. The feed unit in accordance with claim 1, wherein the stack translator is flexibly connected in the vicinity of its ends to the rigid legs of the solid parallelogram by solid joints.

3. The feed unit in accordance with claim 2, wherein the stack translator is connected to mounting elements supported by the solid joints, and the mounting elements and solid joints are unitary with the solid parallelogram.

4. The feed unit in accordance with claim 3, wherein the stack translator is frictionally clamped between the mounting elements.

5. The feed unit in accordance with any one of claims 1 through 4, wherein the rigid legs are connected to one another by solid elastic elements.

6. The feed unit in accordance with claim 5, wherein the solid elastic elements are recesses in members of the parallelogram connected between the rigid legs.

7. The feed unit in accordance with claim 6, wherein the four-bar chain is single piece.

8. The feed unit in accordance with claim 7, wherein the four-bar chain is machined from a metal plate by milling or erosion.

9. The feed unit in accordance with claim 1, wherein the four-bar chain has multiple pieces, the elastic elements and the rigid legs being separately formed.

10. The feed unit in accordance with claim 1, wherein a wire clamp is attached directly to one of the rigid legs of the translating solid parallelogram and the other rigid leg is attached to a bonding head of an ultrasonic wire bonder.