US 5,964,460 AGranted

Copying device with a printing medium detecting device

AssigneeSharp Kabushiki Kaisha

InventorsShinichi Azumi, Kouji Yamaji

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Abstract

Sheets stacked on the sheet tray are delivered and fed one by one along the sheet conveyance path by the rotation of a sheet-feed roller in cooperation with a frictional member. The sheet conveyance path has a sheet-feed actuator provided thereon for detecting a sheet being conveyed and further has a sheet-pass actuator provided thereon between the sheet-feed actuator and the sheet-feed roller. Two slit arms of the sheet-feed and sheet-pass actuators are arranged so as to interrupt the optical path of a common optical sensor. When the rear of a preceding sheet being conveyed has passed by the sheet-pass actuator, the optical sensor detects the state. In response to this detection, a signal for starting the delivery of the next sheet is launched, thus reducing the interval between sheets.

Claims14

Dependent claims

A sheet delivering and feeding device comprising:

a sheet tray for having sheets stacked thereon;
a feed roller for delivering sheets one by one from the sheet tray;
control means for starting a feed roller for delivering a sheet;
a frictional member disposed opposite the feed roller for preventing multiple delivery of sheets;
a sheet-feed detecting means for detecting the sheet delivered by the feed roller to produce a signal instructing the start of a sheet feeding operation;
a sheet-pass detecting means disposed in the sheet conveyance path between the sheet-feed detecting means and the feed roller for detecting a front and rear end of a sheet conveyed along the sheet conveyance path, wherein the start of the feed roller in response to said start signal for delivering the sheet is controlled in accordance with the detection states of the sheet-feed detecting means and the sheet-pass detecting means;
said sheet-feed detecting means and said sheet pass detecting means having a common optical sensor means.

4 more elements

A sheet delivering and feeding device comprising:

a sheet tray for having sheets stacked thereon;
a feed roller for delivering sheets one by one from the sheet tray;
control means for starting a feed roller for delivering a sheet;
a frictional member disposed opposite the feed roller for preventing multiple delivery of sheets;
a sheet-feed detecting means for detecting the sheet delivered by the feed roller to produce a signal instructing the start of a sheet feeding operation;
a sheet-pass detecting means disposed in the sheet conveyance path between the sheet-feed detecting means and the feed roller for detecting a front and rear end of a sheet conveyed along the sheet conveyance path, wherein the start of the feed roller in response to said start signal for delivering the sheet is controlled in accordance with the detection states of the sheet-feed detecting means and said sheet-feed detecting means, and
the sheet-feed detecting means is disposed in the sheet conveyance path and comprises a sheet-feed actuator which is swayed by the delivered sheet and a sensor which detects the swaying state of the sheet-feed actuator to produce a signal indicating the sheet delivery and feeding state;
and the sheet-pass detecting means is disposed in the sheet conveyance path and comprises a sheet-pass actuator which is swayed by the delivered sheet while the swaying state of the sheet-pass actuator is detected by the same sensor to detect the sheet delivery and feeding state.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/907,889Filed 11 Aug 1997
Priority: JP 8-2680759 Oct 1996
Granted: 12 Oct 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B65H 3/5223
The retainers positioned under articles separated from the top of the pile: retainers of the pad-type, e.g. friction pads
B65H 3/0661
Rollers or like rotary separators: for separating inclined-stacked articles with separator rollers above the stack
B65H 7/02
Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or…:…
B65H 2511/51
Occurence: presence