Movable pressure spring band to avoid excessive wear from card f

Details Movable pressure spring band to avoid excessive wear from card f Movable pressure spring band to avoid excessive wear from card f

1990-06-14

1992-02-18

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Position determining

377 8, 377 16, 271274, G06M 706, G06M 302

Patent

active

050900323

ABSTRACT:
A pressure spring for urging a document (10) against a reading head (22) in a document processing machine, comprises a resilient band (46) on band support arms (50) with different portions of the discontinuous resilient band (46) being selected to lie between the support arms (50). Manually operable means (80), (70) can be provided. In one embodiment, a motor (84) under the action of a controller (106), automatically advances the discontinuous band (46) whenever a service date or a pre-determined document count has been exceeded. Should the discontinuous resilient band (46) reach an extremity of travel, the controller (106) provides that the motor (84) returns the discontinuous resilient band (46) back to its start position.

REFERENCES:
patent: 3702925 (1972-11-01), Anderson et al.
patent: 3737666 (1973-06-01), Dutro
patent: 3756589 (1973-09-01), Carbine
patent: 4163550 (1979-08-01), Armstrong
patent: 4534550 (1985-08-01), Reist

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