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US 5,808,465 AGranted
Electronically controlled high speed press feed
AssigneeVamco Machine & Tool, Inc.
InventorsJoseph P. Gentile, Vaughn H. Martin, Daniel G. Lukas
Life of this patent
Estimating the term…
Abstract
The present invention provides for 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.
Claims12
A press feed capable of being driven in synchronization with a press, said press feed comprising:
- means for sensing a selected phase of a press cycle of said press, comprising:
- a moving transformer feedback device having a rotatable winding coupled to a shaft and first and second stationary windings respectively displaced 90.degree.;
- excitation means for generating a sinusoidal signal of known amplitude and phase shift with respect to a master synchronizing/event timer circuit, said signal being connected to the rotatable winding of said feedback device;
- signal means for low-pass filtering the feedback signals from said first and second stationary winding to reduce harmonic components greater than the excitation frequency;
- signal means for synchronizing and simultaneous sampling both first and second stationary winding at a frequency multiple of the said excitation frequency with the correct phase compensation to provide discrete data outputs representative of the sine and cosine of the angle of said shaft;
- data collection means for storing multiple concurrent data outputs of said stationary windings for processing at some decimation ratio determined by computational means;
- and
- computational said means responsive to the decimation and digital filtering of said multiple simultaneous data outputs of said stationary windings for computing the angular position of said shaft;
- means for engaging stock material adapted to be fed by said press feed to said press;
- and
- infinitely variable release means connected to said means for engaging stock material and communicating with said sensing means, said infinitely variable 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 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.
8 more elements
A press feed for use with a high speed press, comprising:
- means for determining the position of the press, comprising:
- a moving transformer feedback device having a rotatable winding coupled to a shaft and first and second stationary windings respectively displaced 90.degree.;
- excitation means for generating a sinusoidal signal of known amplitude and phase shift with respect to a master synchronizing/event timer circuit, said signal being connected to the rotatable winding of said feedback device;
- signal means for low-pass filtering the feedback signals from said first and second stationary winding to reduce harmonic components greater than the excitation frequency;
- signal means for synchronizing and simultaneous sampling both first and second stationary winding at a frequency multiple of the said excitation frequency with the correct phase compensation to provide discrete data outputs representative of the sine and cosine of the angle of said shaft;
- data collection means for storing multiple concurrent data outputs of said stationary windings for processing at some decimation ratio determined by computational means;
- and
- computational said means responsive to the decimation and digital filtering of said multiple simultaneous data outputs of said stationary windings for computing the angular position of said shaft;
- a first feed roller formed integral with driving means;
- a second feed roller;
- means for releasing said second feed roller so that motive force is not provided to stock material between said first and second feed rollers;
- and
- means for synchronizing press position, feed roller release, and activation of first feed roller driving means.
10 more elements
Dependencies are inferred from the claim text.