Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1981-12-07
1985-07-16
Braun, Leslie A.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
F16H 2118
Patent
active
045288607
ABSTRACT:
A transfer drive mechanism (10, 62, 81, 116, 136, 166) for use in conjunction with work transfer apparatus is disclosed which is operative to provide extremely smooth rapid acceleration/deceleration while substantially eliminating the high stresses and potential workpiece dislocating jerk often associated with such drive systems. The drive mechanism comprises a planetary gear (26, 52, 76, 93, 128, 160, 178) having an eccentric follower means (30, 56, 80, 97, 162, 176) which is adapted to be revolved around a stationary sun gear (28, 54, 70, 88, 130, 138, 180) which imparts a rotating motion thereto. The relative diameters of the sun gear (28, 54, 70, 88, 130, 138, 180) and planet gear (26, 52, 76, 93, 128, 160, 178) and the positioning of the eccentric follower means (30, 56, 80, 97, 162, 176) are all interrelated so as to provide a controlled acceleration transfer motion wherein the acceleration and jerk in the direction of transfer movement substantially approximate zero at both the beginning and end of the transfer travel. Suitable linkage means (32, 126) or a scotch yoke means (174) are provided to interconnect the eccentric follower means (30) to the work transfer apparatus (36, 118). In some embodiments the drive mechanism (81, 116, 136, 166) is adapted to allow use of nonreversible power means while still providing a linearly reciprocable work transfer movement with substantially zero jerk.
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Product Engineering, "5 Cardan-Gear" by Sigmund Rappaport, Sep. 28, 1959, vol. 30, pp. 66 and 67.
Braun Leslie A.
Diehl Dwight G.
Expert Automation, Inc.
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