Linespacing apparatus
AssigneeSCM Corporation
InventorsHans W. Mueller, Richard E. Shattuck, Albert H. Cryder, John L. Nelson
Life of this patent
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Abstract
A linespacing apparatus includes a slip clutch assembly which is driven by an electric motor. The slip clutch assembly includes a face cam which drives a linkage which, in turn, indexes a platen in order to linespace the platen. The face cam includes an abutment portion which abruptly halts the motion of the linkage and the slip clutch assembly prevents bounce or recoil of the linkage thereby promoting smooth operation of the apparatus. The linkage may be adjusted by an operator to vary the amount of rotation of the platen during each operating stroke of the linkage.
Claims6
A linespacing apparatus for linespacing a platen including an electric motor, slip clutch means, driving connection means connecting the electric motor and the slip clutch means, cam means, linkage means including a cam follower driven by the cam means, and ratchet means mounted on the platen engaged and rotated by the linkage means for rotating the platen a selected amount in response to rotation of the electric motor, the cam means comprising:
- a face cam having a first profile surface to engage and drive the cam follower;
- said face cam having a second profile surface which includes an abutment wall portion engaged by the cam follower to limit rotating motion of said face cam for limiting the drive of the linkage means;
- and
- said first profile surface includes a straight wall portion forming an initial position for the cam follower, said straight wall portion and said abutment wall portion form a passageway for the cam follower to move from said abutment wall portion to said straight wall portion.
Dependencies are inferred from the claim text.