Browse Prior Art Database

Envelope Feed Device for Printer

IP.com Disclosure Number: IPCOM000034645D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 3 page(s) / 87K

Publishing Venue

IBM

Related People

Burgess, DE: AUTHOR [+3]

Abstract

A known dot matrix printer experiences difficulty when printing on envelopes due to the fact that their thickness is generally such that the paper drive rollers have difficulty in pushing them along the paper path between the printhead and platen without stalling or skewing the envelope. Opening the space between the printhead and the platen, the print gap, wide enough for easy accommodation of envelopes, increases the flight distance of the print wires to the extent that excessive (Image Omitted) wire breakage occurs when printing on papers thinner than envelopes. The present embodiment solves this problem by providing an Envelope Feed Device, to open the print gap, which must be manually held in the operated position while printing envelopes. When the operating lever is released, a normal print gap is automatically restored.

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Envelope Feed Device for Printer

A known dot matrix printer experiences difficulty when printing on envelopes due to the fact that their thickness is generally such that the paper drive rollers have difficulty in pushing them along the paper path between the printhead and platen without stalling or skewing the envelope. Opening the space between the printhead and the platen, the print gap, wide enough for easy accommodation of envelopes, increases the flight distance of the print wires to the extent that excessive

(Image Omitted)

wire breakage occurs when printing on papers thinner than envelopes. The present embodiment solves this problem by providing an Envelope Feed Device, to open the print gap, which must be manually held in the operated position while printing envelopes. When the operating lever is released, a normal print gap is automatically restored. Fig. 1 shows a left side view of a printer mechanism. Printhead 1 is rigidly attached to a carrier fitted with bushings that glide on the printhead carrier Eccentric Guide Shaft 2. (For clarity the ribbon, ribbon shield, and printhead carrier are not shown.) The center of Eccentric Shaft 2 is fixed with respect to Platen 3. Print Gap Adjustment Lever 4 is rotationally attached to Eccentric Shaft 2. It is seen, then, that as Eccentric Shaft 2 is rotated by movement of Print Gap Adjustment Lever 4, the carrier bushings, and so Printhead 1, move closer to or further away from Platen 3, thus decreasing or increasing Print Gap 5. There are two printer sideframe Detents 6 for positioning Adjustment Lever 4 to set Print Gap 5 to accommodate single or multipart forms. Paper...