Browse Prior Art Database

Out of Paper Switch for an Unattended Printer

IP.com Disclosure Number: IPCOM000081747D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Brown, CG: AUTHOR

Abstract

Shown is a device for detecting the end of paper in an unattended printing system. In Fig. 1 is shown the usual condition of paper between the platen and the rear feed roller in an unattended printer. The paper, as shown in Fig. 1, presses down on the flexible tip of a magnet actuator. Thus, the paper holds the magnet actuator out of magnetic association with the reed switch and the reed switch is thus open, indicating to the system that there is paper in the machine.

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Out of Paper Switch for an Unattended Printer

Shown is a device for detecting the end of paper in an unattended printing system. In Fig. 1 is shown the usual condition of paper between the platen and the rear feed roller in an unattended printer. The paper, as shown in Fig. 1, presses down on the flexible tip of a magnet actuator. Thus, the paper holds the magnet actuator out of magnetic association with the reed switch and the reed switch is thus open, indicating to the system that there is paper in the machine.

Shown in Fig. 2 in bold lines is a situation when the machine has run out of paper. In this case the magnet, which is spring biased toward this position, is allowed to rotate into magnetic association with the reed switch and close it, thus indicating that the system is out of paper. However, should the system back the paper up after allowing the reed switch to be closed, it is desirable that the magnet not be rotated any further to prevent damage to the reed switch which is located closely adjacent the magnet.

Shown in dotted lines is the action of the actuator when the paper direction is reversed. In this case, the flexible tip of the actuator lifts upward and allows the paper to pass by it without causing further rotation of the magnet. Thus, as illustrated, the flexible tip which acts in the manner of a "flap valve" is the only portion of the actuator which is ever in the paper path.

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