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Sheet Feeders

a feeder and sheet technology, applied in the field of sheet feeders, can solve the problems of reducing increasing the cost and noise of sheet feeders, and increasing the bulk and complexity of sheet feeders, so as to reduce the scuffing of the surface and improve the reliability of feeding sheets

Active Publication Date: 2015-11-12
CREASESTREAM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a sheet feeder that can quickly and reliably feed single sheets of paper, regardless of their thickness or stack height. It operates without the need for air pumps and reduces friction on the surface of the sheets, resulting in improved handling downstream of the feeder. The sheets are transported on freely spinning rollers in areas where they are not in contact with guide means, which improves their feeding reliability and reduces surface damage. The invention is also designed to allow for easy replacement of worn parts, such as belts or rollers.

Problems solved by technology

Friction between the moving sheet and the stationary parts of the feed deck has a tendency to cause scuff marks on the surface of the paper.
That is a particular problem with the increasing use of digital printing on paper with a smooth surface.
However, such air pumps add to the bulk and complexity of the sheet feeder as well as its running costs and noise levels.
It should reliably deliver only a single sheet at a time because a misfeed in which two sheets are delivered together will at best not be processed properly downstream and may at worst jam the apparatus, causing a costly delay in workflow.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0028]FIG. 1 shows a machine 2 for creasing, perforating or cutting sheets of paper from a stack. A stack of paper to be processed (not shown) is placed on a feed deck 4, supported by side guides 6. A sheet feeder device in accordance with the present invention separates individual sheets of paper from the bottom of the stack and feeds them into the body 8 of the machine 2 along the plane of the feed deck 4. After a processing operation such as creasing, perforating or cutting by the machine 2, the processed sheets are collected as an output stack in an output bin 10. Alternatively, the processed sheets could be delivered individually on rollers to other machinery for further operations to be carried out.

[0029]A control panel 12 allows an operator to control aspects of the operation of the machine 2, such as its speed, in a conventional manner. An emergency stop button 14 is provided in a prominent and easily accessible location.

[0030]FIG. 2 is a plan view of the sheet feeder of the...

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PUM

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Abstract

A sheet feeder comprises a feed deck for supporting a stack of sheets (65) to be fed. The feed deck may be formed by a bed of freely spinning rollers. A feed block (62) comprises a friction pad (66) that projects from the bottom of the feed block (62) towards a drive belt (42) to define a gate therebetween. The drive belt (42) frictionally engages the underside of a bottom sheet of the stack (65) and urges the sheet towards the gate. The feed block (62) comprises a front face (72) immediately upstream from the gate, which is inclined at a sharp angle to the feed direction. The friction pad (66) comprises a lower face that is substantially parallel to the feed direction and does not intersect the plane of the feed block front face (72).

Description

FIELD OF THE INVENTION[0001]The invention relates to sheet feeder apparatus, which separates sheets of paper or card from a stack and feeds them individually from the apparatus in a direction parallel to the plane of the sheets. The sheet feeder may be part of a device for processing the paper, for example by creasing, perforating or cutting it between a pair of rollers or it may simply deliver the individual sheets to a separate device for further processing. The nature of the downstream operation does not form part of the present invention.[0002]The sheets handled by the feeder may comprise paper or cardboard, for example in the density range 50 gm2 to 500 gm2, or other similar materials such as thin plastics. For simplicity, and without limitation, the material will be referred to hereafter as“paper”.BACKGROUND OF THE INVENTION[0003]Sheet feeders are known that use a drive means such as a belt or roller to remove a single sheet laterally from the bottom of a stack of sheets that ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65H5/02B65H3/04B65H1/06
CPCB65H5/026B65H3/042B65H1/06B65H3/04B65H3/5238B65H3/56
Inventor HARRIS, GRAHAM MICHAELBARRETT, PAUL GRAHAM
Owner CREASESTREAM