Elecronically controlled high speed press feed

• US 5,720,421 A
• Filed: 12/06/1994
• Issued: 02/24/1998
• Est. Priority Date: 02/28/1994
• Status: Expired due to Term

• Current Assignee: Vamco International Incorporated (Nidec Corporation)
• Original Assignee: Vamco Machine & Tool, Inc.
• Inventors: Lukas, Daniel G., Martin, Vaughn H., Gentile, Joseph P.
• Primary Examiner(s): Stodola, Daniel P.
• Assistant Examiner(s): Kaness, Matthew A.
• Application Number:
  US08/349,877
• Time in Patent Office: 1,176 Days
• Field of Search: 226/32, 226/35, 226/124, 226/153, 226/154, 226/155, 226/187, 324/207.17, 324/207.25, 324/233, 250/231.16, 250/231.13, 250/231.14
• US Class Current: 226/35
• CPC Class Codes: B21D 43/09 by one or more pairs of rollers for feeding sheet or strip material
• CPC Class Codes: B23Q 15/013 Control or regulation of feed movement B23Q15/12 takes precedence
• CPC Class Codes: B65H 20/005 Electrical drive motor control devices therefor
• CPC Class Codes: B65H 20/04 to effect step-by-step advancement of web
• CPC Class Codes: B65H 23/1884 with step-by-step advancement
• CPC Class Codes: B65H 2511/212 Rotary position
• CPC Class Codes: B65H 2513/51 Sequence of process
• CPC Class Codes: B65H 2553/40 using optical, e.g. photographic, elements
• CPC Class Codes: B65H 2557/30 Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof
• CPC Class Codes: G01D 5/2046 by a movable ferromagnetic element, e.g. a core
• CPC Class Codes: G05B 19/21 using an incremental digital measuring device
• CPC Class Codes: G05B 19/33 using an analogue measuring device
• CPC Class Codes: G05B 2219/37558 Optical sensor, scanner
• CPC Class Codes: G05B 2219/45142 Press-line
• CPC Class Codes: G05B 2219/49125 Open clamp if tool approaches clamp zone, close again afterwards

Abstract

A press feed apparatus for use in feeding stock material to a high speed automatic press. The feed roller is driven by a servo motor integral with the shaft of the roller, the feed roller release mechanism is infinitely adjustable, and a feedback system is used to accurately determine the position of various shafts. The apparatus is controlled electronically, by a microprocessor or the like, which permits the press feed to be electronically geared to the press and accurately operate at high speeds.

Claims

1. A press feed capable of being driven in synchronization with a press, said press feed comprising:

means for sensing a selected press cycle phase of said press;

means for engaging stock material adapted to be fed by said press feed to said press; and

release means capable of infinite variation during the feeding of said stock material to said press connected to said means for engaging stock material and communicating with said sensing means, said release means being operable to move said means for engaging stock material in a first direction relative to said stock material responsive to detection by said sensing means of the onset of said selected press cycle phase to cause separation of the means for engaging from said stock material and for moving said means for engaging stock material in a direction generally opposite said first direction responsive to detection by said sensing means of the termination of said selected press cycle phase to cause the means for engaging to reengage with said stock material.

2. The press feed of claim 1, wherein said means for engaging comprises:

a first feed roller;

a second feed roller disposed relative to said first feed roller such that stock material may pass between the two feed rollers;

driving means integral with said first feed roller.

3. The means for engaging of claim 2, wherein said first feed roller has a feed roll shaft and said driving means comprises a high torque motor constructed directly on the feed roll shaft.

4. The press feed of claim 1 wherein said selected press cycle phase is during piloting of said stock material in said press.

5. The press feed of claim 1 wherein said means for engaging stock material comprise means for feeding said stock material to said press.

6. The press feed of claim 1 wherein said release means comprise:

at least one rotatable screw; and

means for rotating said at least one rotatable screw in opposite directions.

7. The press feed of claim 6 wherein said at least one rotatable screw comprises two rotatable screws.

8. The press feed of claim 1 wherein said release means comprises:

a wedge;

power means operatively connected to the wedge for linearly moving the wedge;

a cam follower which is operatively connected to the means for engaging stock material;

wherein the movement of the means for engaging stock material is in relation to the linear movement of the wedge.

9. The press feed of claim 1 wherein said release means comprises at least one servo controlled hydraulic cylinder.

10. The press feed of claim 1 wherein said release means comprises a valve arrangement.

11. The press feed of claim 1 wherein said release means comprises at least one linear servo motor.

12. The press feed of claim 1 wherein said release means comprises at least one linear stepper motor.

13. The press feed of claim 1 wherein said release means comprises at least one voice coil servo motor.

14. The press feed of claim 1 wherein said release means comprises at least one linear voice coil motor.

15. The press feed of claim 1 wherein said release means comprises at least one solenoid style linear actuator.

16. The press feed of claim 1 further comprising means for controlling the operation of said release means during at least one of operation or stoppage of said press feed.

17. The press feed of claim 16 wherein said controlling means is operable to receive a first signal from said sensing means indicative of said onset of said selected press cycle phase and to generate and transmit a first command signal to power means drivenly connected to said release means to move said means for engaging stock material in said first direction, said controlling means being further operable to receive a second signal from said sensing means indicative of said termination of said selected press cycle phase and to generate and transmit a second command signal to said power means to move said means of engaging stock material in said second direction.

18. The press feed of claim 1 further comprising adjustable pressure means connected to said means for engaging stock material and communicating with said sensing said and release means, said adjustable pressure means being operable to move said means for engaging stock material only in a direction generally opposite said first direction responsive to detection by said sensing means of the termination of said selected press cycle phase.

19. The press feed of claim 18 wherein said adjustable pressure means is an air bag.

20. The press feed of claim 18 wherein said selected press cycle phase is during piloting of said stock material in said press.

21. The press feed of claim 18 wherein said means for engaging stock material comprise means for feeding said stock material to said press.

22. The press feed of claim 18 wherein said release means comprise:

at least one rotatable screw; and

means for rotating said at least one rotatable screw in opposite directions.

23. The press feed of claim 22 wherein said at least one rotatable screw comprises two rotatable screws.

24. The press feed of claim 18 wherein said release means comprises:

a wedge;

power means operatively connected to the wedge for linearly moving the wedge;

a cam follower which is operatively connected to the means for engaging stock material;

wherein the movement of the means for engaging stock material is in relation to the linear movement of the wedge.

25. The press feed of claim 18 wherein said release means comprises at least one servo controlled hydraulic cylinder.

26. The press feed of claim 18 wherein said release means comprises a valve arrangement.

27. The press feed of claim 18 wherein said release means comprises at least one linear servo motor.

28. The press feed of claim 18 wherein said release means comprises at least one linear stepper motor.

29. The press feed of claim 18 wherein said release means comprises at least one voice coil servo motor.

30. The press feed of claim 18 wherein said release means comprises at least one linear voice coil motor.

31. The press feed of claim 18 wherein said release means comprises at least one solenoid style linear actuator.

32. The press feed of claim 18 further comprising means for controlling the operation of said release means during at least one of operation or stoppage of said press feed.

33. The press feed of claim 32 wherein said controlling means is operable to receive a first signal from said sensing means indicative of said onset of said selected press cycle phase and to generate and transmit a first command signal to power means drivenly connected to said release means to move said means for engaging stock material in said first direction, said controlling means being further operable to receive a second signal from said sensing means indicative of said termination of said selected press cycle phase and to generate and transmit a second command signal to said power means to move said means of engaging stock material in said second direction.

34. A press feed for use with a high speed press, comprising:

means for determining the position of the press;

a first feed roller formed integral with driving means;

a second feed roller;

means for positioning said second feed roller so that motive force is not provided to stock material between said first and second feed rollers;

means for releasing said first and second feed rollers capable of infinite variation during the feeding of said stock material to said press;

means for synchronizing press position, feed roller release, and activation of first feed roller driving means.

35. The press feed of claim 34, wherein said synchronization means comprises a microprocessor.

36. The press feed of claim 34, wherein said synchronization means comprises a personal computer.

37. A system for controlling a press feed used with a press, comprising:

means for sensing the position of a press shaft;

means for positioning a feed roll for feeding stock material;

means for sensing the position of said feed roll of the press feed;

means for a user to input control parameters;

means for generating control signals to a feed roll drive actuator based upon said sensed positions and user input; and

means for releasing said feed roll capable of infinite variation during the feeding of stock material to said press.

38. The control system of claim 37, wherein a single microprocessor is used for generating said control signals.

39. The control system of claim 37, wherein a single microprocessor is used to accept user input and generate control signals.

40. The control system of claim 37, wherein the user input means and control signal generation means is an industry standard personal computer.