Browse Prior Art Database

Second Sheet Restraint

IP.com Disclosure Number: IPCOM000051491D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Bielling, RA: AUTHOR [+4]

Abstract

In a cut sheet feed attachment for high-speed printers, or the like, there are plural input trays from which sheets are fed to a common path. A technique and apparatus is described for an improved manner of implementing second sheet restraint in plural input hoppers.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 77% of the total text.

Page 1 of 2

Second Sheet Restraint

In a cut sheet feed attachment for high-speed printers, or the like, there are plural input trays from which sheets are fed to a common path. A technique and apparatus is described for an improved manner of implementing second sheet restraint in plural input hoppers.

In the figure, a top sheet of the stack is picked by means not shown. The second sheet may follow with the first due to the static charge between them or resulting from paper edge conditions. It can be appreciated that it is desirable to restrain the second sheet from entering the feed path. As shown, a pawl 1 is normally spring 2 loaded into the underside of a first sheet 3 and backed up by paper guide surface 4. As sheet 3 leaves the stack and is transported by transport rollers 5, pawl 1 prevents second sheet 6 from following. When first sheet 3 has exited the path and another sheet is desired, solenoid 7 is energized and pawl 1 retracts below the paper path. Thus, the picker/separator (not shown) is allowed to push the topmost sheet into rotating transport rollers 5. Once that sheet is engaged by rollers 5, a sensor 8, located downstream of the first set of transport rollers 5, detects paper presence and develops a signal for deenergizing solenoid 7. Pawl 1 is allowed to restore under the load of spring 2 and restrain the next sheet.

An additional advantage of such an arrangement, particularly in an environment including a plurality of input trays, is that additional pawls...