Photocopying – Contact printing – Light boxes
Patent
1993-01-11
1994-08-16
Grimley, A. T.
Photocopying
Contact printing
Light boxes
192 482, 192 485, 355274, G03G 1514
Patent
active
053391454
ABSTRACT:
A one-way coupling transmits torque between a power-transferring spring clutch of a driving system, and a driven system. The coupling comprises a first coupler linked to the spring clutch, and a second coupler connected to the driven system. The power-transmitting direction of the driving system is the direction of spring clutch engagement, and is the rotational direction in which the couplers engage. The first coupler receives torque applied to the driven-system side of the coupling independently of the driving system only when the torque is in the rotational direction engaging the second coupler to the first, which at the same time is in the rotational direction in which the first coupler disengages the spring clutch. Torque on the driven-system side of the coupling in the opposite rotational direction disengages the coupling itself. The coupling is applied to the main driven axle of the positioning mechanism of a copying machine image transfer drum. When the drum is manually withdrawn, the second coupler is turned out of engagement with the first; whereas when the transfer drum is installed, the second coupler turns into coupling engagement with the first, but this twisting on the driving system link via the first coupler disengages the spring clutch. Consequently, when performing the manual mount/dismount operations, the driving system is not engaged, such that no hindering load is brought to bear the driven system side.
REFERENCES:
patent: 3583315 (1968-06-01), Herbert
patent: 3764129 (1973-10-01), Yanagawa
patent: 3831724 (1974-08-01), Baer
patent: 3850275 (1974-11-01), Helander
patent: 3987880 (1976-10-01), Holland-Letz et al.
patent: 4840259 (1989-06-01), Guslits et al.
patent: 5220387 (1993-06-01), Tsunoda et al.
Dang T. A.
Grimley A. T.
Mita Industrial Co. Ltd.
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