Presses and the like

• US 3,914,977 A
• Filed: 10/31/1974
• Issued: 10/28/1975
• Est. Priority Date: 11/14/1973
• Status: Expired due to Term

• Current Assignee: Derek John Rimmer
• Original Assignee: Derek John Rimmer
• Inventors: Rimmer, Derek John
• Primary Examiner(s): Lanham, C. W.
• Assistant Examiner(s): Rogers, Robert M.
• Application Number:
  US05/519,429
• Time in Patent Office: 362 Days
• Field of Search: 72/421,419,DIG.11 226/123,142,154
• US Class Current: 72/419
• CPC Class Codes: B21D 43/02 Advancing work in relation to the stroke of the die or tool
• CPC Class Codes: B21D 43/09 by one or more pairs of rollers for feeding sheet or strip material
• CPC Class Codes: B65H 20/04 to effect step-by-step advancement of web
• CPC Class Codes: F16H 27/02 with at least one reciprocating or oscillating transmission member F16H27/04 takes precedence

Abstract

A drive mechanism for a press feed device which operates in synchronism with the cycling of the press but which avoids shock loads on the feed rolls at the start of each feed cycle. This is accomplished by modifying the simple harmonic drive motion derived from the rotary member of the press with a harmonic motion of a different frequency so as to produce a resultant motion having zero acceleration at the beginning and middle of each cycle.

Claims

1. A stock feed device for a press having a cyclically movable member, feed elements for moving the stock through the press, and a means operated by said cyclically movable member for driving the feed elements, said driving means including a first driven element operating with a simple harmonic motion coordinated with the motion of said cyclically movable member, a second driven element carried by said first driven element and operating with a simple harmonic motion having a frequency equal to the product of an integer and the frequency of said first driven element, an output element actuated by said second driven element, and means connecting said output element with said feed elements to thereby drive the feed elements with a motion composed of two simple harmonic components corresponding to the motions of the respective driven elements.

2. The stock feed device of claim 1, wherein the acceleration of the output element is composed of two simple harmonic components of equal amplitude and having frequencies which differ by a ratio of 1 to 3.

3. The stock feed device of claim 1, wherein the harmonic acceleration components of the output element are 180* out of phase at the beginning of each feed cycle.

4. A stock feed device for a press having a crankshaft, feed elements for moving the stock through the press and means operated by the crankshaft for driving the feed elements, said driving means including a hub on said crankshaft, a gear wheel journaled on said hub with its axis parallel to, but offset from, the axis of said crankshaft, a fixed ring gear disposed with its axis coinciding with the axis of said crankshaft, a transmission gear journaled on said hub and meshing with said ring gear and said gear wheel, an eccentric on said gear wheel, an output element journaled on said eccentric, and means connecting said output element with said feed elements whereby said feed elements are operated with a motion composed of two simple harmonic components corresponding to the motions of the gear wheel axis relative to the crankshaft axis and the eccentric axis relative to the gear wheel axis.

5. The stock feed device of claim 4, wherein the frequencies of the two simple harmonic components differ by a ratio of 1 to 3 and the eccentricities of the gear wheel axis and eccentric differ by a ratio of 9 to 1.