Importance

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Abstract

A pull guide mechanism for moving a copy sheet transversely of a conveyor board into proper registration in a printing, duplicating or like machine. A drive wheel is rotatably mounted in the conveyor board and a pressure wheel is disposed above the conveyor board for sandwiching a copy sheet therebetween and pulling the sheet into proper registration in response to driven rotation of the drive wheel. A carriage is mounted on the machine for reciprocal movement toward and away from the conveyor board and the drive wheel. A spring biased piston is mounted on the carriage for limited yielding movement relative to the carriage. The pressure wheel is rotatably mounted on the piston for movement with the carriage toward and away from the drive wheel and for gripping a copy sheet between the wheels against the spring bias. A first adjusting device adjusts the position of the piston relative to the carriage and thereby adjusts the dwell time that the wheels grip the copy sheet. A second adjusting device adjusts the biasing pressure of the spring. A third adjusting device is operatively associated with the first adjusting device for increasing the effective range of adjustment of the first adjusting device to set the mechanism for different weights of copy sheets.

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First Claim