US 5,348,281 AGranted

Sheet refeeding device for use in printing apparatus having a timed pressing member

AssigneeKonica Corporation

InventorsYasushi Yamada, Tsuyoshi Mizubata, Masaru Ushio

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Abstract

A recording sheet feeding device for use in an image forming machine, in which a plurality of sheets on which a first image has been recorded are successively fed from a sheet stacker for a second image to be formed, provided with a sheet pressing mechanism above the stacker which takes a pressing or a non-pressing position with respect to sheets on the stacker. While sheets are being conveyed to the stacker, a pressing operation on the sheets is conducted by driving the mechanism at least twice. Sheet feeding from the stacker is started after the first pressing operation of the mechanism. A feeding timing of the first sheet to be fed after a second pressing operation is delayed compared with a feeding timing of other sheets. In another structure, a periodical pressing operation is conducted each time a predetermined number of sheets are conveyed into the stacker and feeding is started when a sheet preceding by a fixed number from the last sheet in a set number of sheets in the first image forming operation is conveyed into the stacker.

Claims11

Dependent claims

A sheet feeding device for an image forming apparatus including processing means for recording images onto recording sheets, comprising:

(a) stacking means for sequentially stacking at least two groups totaling a set number of recording sheets on which a first image has been formed by the processing means;
(b) feeding means for sequentially feeding each of said sheets of said groups stacked on said stacking means to the processing means for a second image to be formed, said feeding means coming into contact with the lowermost sheet of each of said groups of said stacked sheets;
(c) sheet pressing means for respectively pressing said groups of stacked sheets toward said feeding means;
(d) feeding start control means for controlling said feeding means to start feeding the lowermost sheet of a first of said groups when a predetermined number of recording sheets is stacked in said stacking means, said predetermined number being less than said set number;
and
(e) pressing control means for controlling said sheet pressing means to apply pressure on a first group of said groups of stacked sheets before said feeding start control means controls the feeding means to start feeding, and to apply pressure to a second group of said groups of recording sheets when such second group is stacked in said stacking means.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/073,963Filed 7 Jun 1993 · continuation
Priority: JP 3-14676422 May 1991
Granted: 20 Sep 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G03G 15/65
Apparatus for electrographic processes using a charge pattern: apparatus which relate to the handling of copy material
B65H 3/06
Using friction forces between articles and separator: rollers or like rotary separators
B65H 83/02
Combinations of piling and depiling operations, e.g. performed simultaneously, of interest apart from the single operation of piling or depiling…:…
G03G 15/234
Using a single reusable electrographic recording member: by inverting and refeeding the image receiving material with an image on one face to the…

Family

Serial885,317Parent of this continuation · filed 18 May 1992
US 5,348,281 AThis patent

From the US filing history. Foreign family members aren’t listed.

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