Hydraulic driving arrangement for positioning workpieces in correct relationship to tool heads of a multi-station machine tool
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United States of America Patent
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-
Jun 13, 1989
Issued Date -
N/A
app pub date -
Feb 25, 1987
filing date -
Jun 10, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic driving arrangement for circular indexing tables for the precise positioning of workpieces, with the exact position of the workpieces being determined by an index. A hydraulic motor is provided with an electro-hydraulic follow-up governor using a stepping motor for setting the desired values and a mechanical actual value indication arrangement. A monitoring arrangement positively coupled with the circular indexing table and/or a driving gear of the hydraulic motor indicates whether or not the circular indexing table is in a position suitable for bringing the indexing gear into engagement and, if so, emits a signal triggering the indexing process or, if the circular indexing table is not in the desired position, deactivates the indexing mechanism. The monitoring arrangement comprises a cam disk coupled with the circular indexing table via a gearing so that it performs exactly one rotation by 360.degree. between two desired positions.
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