H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/1, 341/91
H02P 5/00 (2006.01) G05B 19/416 (2006.01)
Patent
CA 1317656
ABSTRACT A reciprocatable shuttle employed to advance a variable number of article carriers through successive work stations is driven on forward and return movements by a plurality of energizable linear motor stators for which the shuttle forms a common reactor. Energization of the stators is controlled by a programmable logic controller in response to inputs from velocity measuring circuits which determine the difference in the actual velocity of the shuttle rela- tive to a desired maximum forward velocity, return velocity and creep velocity; to inputs from distance measuring cir- cuits which determine the distance travelled by the shuttle relative to a forward deceleration point and to a return deceleration point; to inputs which establish the return or forward position of the shuttle; and, to inputs which count the number of article carriers to be advanced. The pro- grammable logic causes the stators to be progressively energized at timed intervals in response to a velocity ON signal to accelerate the shuttle to that velocity; to main- tain the shuttle at that velocity; and, in response to a distance signal, to reversely energize the stators until the shuttle reaches the creep velocity. The maximum number of stators energizable is limited in accordance with the ar- ticle carrier count, and the sequence in which the stators are energized is rotated on each forward-advance movement cycle of the shuttle.
574786
Jervis B. Webb Company
Ridout & Maybee Llp
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