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Drum Transport Document Printing and Handling Mechanism

IP.com Disclosure Number: IPCOM000087613D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 69K

Publishing Venue

IBM

Related People

Thorne, WD: AUTHOR

Abstract

Fig. 1 illustrates the framework in which the drum transport mechanism is placed. It shows the general arrangement for entry of a document or passbook through an entry throat area 3 past light-emitting diode (LED) position sensors 4 and 5 which sense the orientation of an edge of the rectangular document or passbook to assure that its alignment is appropriate for take-up by a clamping mechanism on the transport drum (not shown). The document will be clamped to the transport drum, which will then rotate to bring the document past a registration bar 2. Registration bar 2 is mounted between side walls 1, and the entire drum assembly may be pivoted forward about an axis mounted in pivot bearings 6 in the framework 1.

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Drum Transport Document Printing and Handling Mechanism

Fig. 1 illustrates the framework in which the drum transport mechanism is placed. It shows the general arrangement for entry of a document or passbook through an entry throat area 3 past light-emitting diode (LED) position sensors 4 and 5 which sense the orientation of an edge of the rectangular document or passbook to assure that its alignment is appropriate for take-up by a clamping mechanism on the transport drum (not shown). The document will be clamped to the transport drum, which will then rotate to bring the document past a registration bar 2. Registration bar 2 is mounted between side walls 1, and the entire drum assembly may be pivoted forward about an axis mounted in pivot bearings 6 in the framework 1.

This compresses the document between the drum (not shown) and the registration bar 2 so that a printing mechanism may traverse across the document along the length of registration bar 2. The printing means, which may be a wire matrix print head, the fingered wheel type of printer or any other similar suitable printer, and the traverse mechanism, to move back and forth along the line of the registration bar 2, have not been shown.

Fig. 2 illustrates the internal mechanism which is mounted on the pivot bearings 6 by pivot shaft 7 and supported in a framework 8, all of which may be pivoted on shaft 7. This mechanism comprises the document transport drum 9 and a clamp magnet actuating bar 10 which attracts a clamping member on the drum toward the actuating magnet bar 10 to open up an area for insertion of a document between a clamp and the surface of the drum 9. The position of drum 9 is monitored by a slotted or apertured emitter disk 11 passing through an LED and photosensor combination 12 which produces an output for each increment of the drum. Wire-formed guides 13 support the trailing edge of the document as the drum indexes past the general vicinity of the printing position beneath the registration bar 2, as shown in Fig. 1.

A stepping drive motor 14 (Fig. 2) has a position output emitter 15 with a sensor 16 similar to the emitter and position indicator 11 and 12, respectively. The drive motor 14 drives an output motor pulley 17 which, through belt 18, drives the drum drive pulley 19 which is affixed to a shaft supporting drum 9 axially in bearings (not shown) in housing 8. An actuating magnet for tilting the entire assembly, mounted in frame 8 about its pivots 7, is shown as magnet 20, which would be a solenoid or other similar motion-producing magnet means. When the magnet is energized, the entire assembly, mounted in frame 8, pivots forward on its pivot 7 against the registration bar 2 (Fig. 1) to compress the document between the surface of drum 9 and the back surface of registration bar
2. Then the printing means (not shown) can traverse the area adjacent to registration bar 2 and produce good quality printing.

Energizing the clamp-actuating magnet 10 is accom...