Claims
- 1. A method of operating a press machine by controlling speed of a tool held by a moving ram of the press machine comprising the steps of:
- moving said tool at an initial speed toward a workpiece until the completion of working;
- controlling said tool at a suspension speed so as to stay substantailly still for a period of between 0.05 and 2 seconds immediately after the completion of working said workpiece so that air flow into a space between said tool and said workpiece which has been worked on to smoothly separate said workpiece from said tool to thereby prevent said workpiece from being damaged; and
- controlling said tool, in one cycle of the moving ram, to be at a retrievign speed when said tool leaves said workpiece, wherein said step of controlling said tool at said suspension speed occurs prior to said step of controlling said tool to be at said retrieving speed.
- 2. A method of operating a press machine according to claim 1, wherein said initial speed has a first approaching high speed lasting at least until immediately before said tool touches upon said workpiece and a slow working speed of around 1.5 meter/second such that said tool does not generate high noise while working on said workpiece.
- 3. A method of operating a press machine according to claim wherein said initial, suspension and retrieving speeds are different constant speeds respectively.
- 4. A method of operating a press machine according to claim 1, wherein said initial, suspension and retrieving speeds are gradually changing speeds.
- 5. A method of operating a press machine according to claim 1, wherein said suspension speed is a continuously changing speed.
- 6. A method of operating a press machine with at least a servomotor by controlling speed of a tool held by a moving ram of the press machine comprising the steps of:
- moving said tool at an initial speed towards a workpiece until the completion of working;
- controlling said tool at a suspension speed so as to stay substantially still for a period of between 0.05 and 2 seconds immediately after the completion of working said workpiece so that air flow into a space between said tool and said workpiece which has been worked on to smoothly separate said workpiece from said tool to thereby prevent said workpiece from being damaged; and
- controlling said tool, in one cycle of the moving ram, to be at a retrieving speed when said tool leaves said workpiece, wherein said step of controlling said tool at said suspension speed occurs prior to said step of controlling said tool to be at said retrieving speed, wherein an approaching speed and said suspension speed are performed by a forward motion of said servomotor, and wherein said retrieval speed is performed by a reverse motion of said servomotor.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-310994 |
Dec 1986 |
JPX |
|
Parent Case Info
This is a continuation-in-part application from a USSN 245,476, filed on Aug. 24, 1988, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3827328 |
LaFlamme et al. |
Aug 1974 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
2452646 |
May 1975 |
DEX |
52095 |
Apr 1985 |
JPX |
0189821 |
Aug 1986 |
JPX |
0202727 |
Sep 1986 |
JPX |
Non-Patent Literature Citations (1)
Entry |
"Select-a-Speed", Dreis and Krump Manufacturing Co. Oct. 29, 1964, p. 104. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
245476 |
Aug 1988 |
|