Axially reversing roller for printing presses and sheet coating

Details Axially reversing roller for printing presses and sheet coating Axially reversing roller for printing presses and sheet coating

1988-04-08

1991-11-19

Burr, Edgar S.

Printing

Inkers

Roller

101348, 101205, 101206, 101354, 101DIG38, B41F 3100

Patent

active

050656767

ABSTRACT:
A roller for distributing a coating material such as ink in a press is mounted on a shaft for sliding axially on and rotating on the shaft. First and second internally threaded sleeves are fixed internally of the roller coaxially with each other and concentric to the shaft. One of the threads has a left hand twist and the other has a right hand twist. Two follower plungers, one having left hand thread segments and the other having right hand thread segments are meshed alternately with the left and right hand twist square threads. A link spans between double armed levers which connect to the follower plungers, respectively. When one plunger is automatically forced out of engagement with its cooperating thread in the one sleeve, a force is transmitted through the link to the other lever which causes the other follower plunger and its thread segments to mesh with the internal threads on the other sleeve so the roller changes the direction of its axial movement. A motor is provided for optionally driving the shaft rotationally when the roller peripheral speed exceeds a predetermined value so that the speed of the roller and the threaded sleeves relative to the followers is decreased with the result that axial travel rate of the roller is independently controllable and not directly proportionally to roller rotational rate.

REFERENCES:
patent: 3765328 (1973-10-01), Treft et al.
patent: 3983812 (1976-10-01), Schramm
patent: 4205605 (1980-06-01), Greiner et al.
patent: 4337699 (1982-07-01), Beisel
patent: 4428290 (1984-01-01), Junghaus et al.
patent: 4509426 (1985-04-01), Hardin
patent: 4632029 (1986-12-01), Simeth
patent: 4672894 (1987-06-01), Hardin

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