Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Single revolution input effects desired fractional output
Patent
1995-06-07
1998-01-27
Bonick, Rodney H.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Single revolution input effects desired fractional output
74813R, 74122, 741255, 192 18R, B23Q 1610, F16D 6702
Patent
active
057111928
ABSTRACT:
An improved indexing device for generating a smooth and controlled rotary motion where double rotary cranks having slide members coupled to corresponding slide guides arranged in orientation parallel to the plane of rotation of the rotary cranks are provided. Each slide guide is attached to a trolley movable in a direction transverse to the axis of the slide guides. A linear gear rack is mounted on each trolley in parallel to its sliding motion and are opposingly configured across a rotary gear member. The gear member drives a positive locking clutch which is entirely self contained within the indexer assembly itself and requires no operator or external control. The clutch function is accomplished automatically when appropriate during the indexer cycle. During stationary periods, the output of the indexer is locked preventing movement of the indexer and providing unique stability to the device. The positive locking features of the clutch also provide for different indexer station numbers through a set of matched clutch disks and rotary crank arms. The rotary motion generated is especially smooth in that a first acceleration period of significance is effected at the beginning of the indexed rotary motion to reach a constant driving speed, and a second deceleration period of significance is effected at the end of such indexed rotary motion to come to a halt from the driving speed, producing a unique soft start and stop characteristic to provide smooth rotary motion.
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