Browse Prior Art Database

Dual Direction, Varying Force Sheet Aligner

IP.com Disclosure Number: IPCOM000062591D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 3 page(s) / 46K

Publishing Venue

IBM

Related People

Lass, RL: AUTHOR [+3]

Abstract

Sheets of different sizes and weights are aligned accurately before they are stapled into a set. The alignment system consists of an electrically semiconductive accumulator tray 1, with a front paper stop reference wall 2, a movable left-hand paper stop reference gate 3, paper anti-bounceback stabilizers 4, aligner paddles 5-10, and a means to drive (not shown) and index the paddles. The urethane material out of which the paddles are made is of high wearability, and has a coefficient of friction (paddle to paper) which is greater than that of paper to paper. Paddle wear and the effect of differing paper set thicknesses (making the paddles bend more and press on the sheets harder) are minimized by the paddle configuration.

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Dual Direction, Varying Force Sheet Aligner

Sheets of different sizes and weights are aligned accurately before they are stapled into a set. The alignment system consists of an electrically semiconductive accumulator tray 1, with a front paper stop reference wall 2, a movable left-hand paper stop reference gate 3, paper anti-bounceback stabilizers 4, aligner paddles 5-10, and a means to drive (not shown) and index the paddles. The urethane material out of which the paddles are made is of high wearability, and has a coefficient of friction (paddle to paper) which is greater than that of paper to paper. Paddle wear and the effect of differing paper set thicknesses (making the paddles bend more and press on the sheets harder) are minimized by the paddle configuration. The paddle length is great enough so that the paddle is pre-bent, so that additional bending does not require appreciable extra force. The leading paddles (6, 8 and 10) on each set of paddles are thicker than the trailing paddles (5, 7 and 9). The leading paddles supply the majority of the paper driving force, as they swing about their centers. The trailing paddles allow the paper to dissipate any excess energy that may have been caused by the leading paddles. This excess energy manifests itself by buckling of the sheet between the paddles and the corresponding reference edge. The trailing paddles are thinner than the leading ones. Therefore, the trailing paddles exert less normal force on the sheet, and consequently less lateral driving force is developed. This allows the sheet to flatten back out, yet not spring back from the reference edge. In this configuration, front aligning paddles 5 and 6 are proportionately thicker than the others because they are doing the same work in the forward direction as the other two sets of paddles combined are doing in the leftward direction. Each aligner paddle set therefore has a leading driver paddle and a trailing dissipater paddle. The drive system couples all three paddle sets together, so that they turn relative to one another. The drive system phases the paddles such that they are attempting to pull the sheet in only one direction at a time. For example, leftward aligning paddles 7 and 9 complete their work before front-aligning paddle 6 starts to pull the sheet forward. This optimizes the aligning forces developed. Stabilizers 4 also aid in minimizing sheet rebound. The sta...