Aperture-controlling device in a variable-scale photocopying machine
AssigneeRicoh Company, Ltd.
InventorsShozo Shimomura, Tadaaki Kanno
Life of this patent
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Abstract
In a variable-scale photocopying machine having a photosensitive medium, a light source, an optical system for projecting light from the source as an exposure light beam onto the medium, and a scale-varying mechanism, the width of the light beam is adjustable by an adjusting mechanism, which is actuated by a tensioned cord connected thereto when the cord is deflected by an adjusting member in response to movement of the scale-varying mechanism thereby to adjust the quantity of the exposure light to suit each scale of photocopying.
Claims5
In a variable-scale photocopying machine having a photosensitive medium, a light source, and an optical system including a scale-varying mechanism for varying the photocopying scale and operating to project light from the light source as an exposure light beam onto the photosensitive medium, the combination therewith of an aperture-controlling device comprising:
- an aperture-adjusting mechanism for adjusting the width of the exposure light beam;
- a flexible filament structure in tensioned state connected at one end to the aperture-adjusting mechanism for adjusting actuation thereof and passed at an intermediate part thereof around a guide, whereby a span of the filament structure is formed between the aperture-adjusting mechanism and the guide;
- an aperture-adjusting member engaging the filament member and being movable in opposite first and second directions to adjustably deflect the filament structure at a point of the span thereby to adjustably actuate the aperture-adjusting mechanism;
- first biasing means for biasing the aperture-adjusting member in the first direction;
- a stationary stop against which the aperture-adjusting member is biased by the first biasing means in response to the operation of the scale-varying mechanism, the aperture-adjusting mechanism then being normally in an equal-scale position;
- second biasing means for biasing the aperture-adjusting member in the second direction;
- and
- an adjustable stop member which is positionally adjustable according to a photocopying scale other than equal scale, and against which the aperture-adjusting member is biased by the second biasing means in response to operation of the scale-varying mechanism, the aperture-adjusting mechanism then being in adjusted position for said photocopying scale.
Dependencies are inferred from the claim text.