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Browse Prior Art Database

Serial Matrix Line Printer

IP.com Disclosure Number: IPCOM000078933D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Barna, TB: AUTHOR [+4]

Abstract

A line printer for printing a line of characters at a time has a matrix print head 10, Fig. 1, (see U.S. Patent 3,592,311) mounted on a carriage driven by a reversible DC motor 15 via a worm gear 20 and belt 25. An emitter 30 also driven by DC motor 15 generates pulses for firing the print wires of the print head 10, thus making the printer velocity insensitive. Print head 10 starts from and always returns to the lefthand side of the printer. A line of characters can be printed on a continuous form or on cut forms. A single stepping motor 35, Fig. 2, operates pin wheel tractors 40, Fig. 1, for feeding continuous forms and platen 45,-Figs. 1 and 2, for feeding cut forms. Motor 35 is operated only in one direction and no reversing is required. Tractors 40 are driven via gearing 50 and drive shaft 55.

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Serial Matrix Line Printer

A line printer for printing a line of characters at a time has a matrix print head 10, Fig. 1, (see U.S. Patent 3,592,311) mounted on a carriage driven by a reversible DC motor 15 via a worm gear 20 and belt 25. An emitter 30 also driven by DC motor 15 generates pulses for firing the print wires of the print head 10, thus making the printer velocity insensitive. Print head 10 starts from and always returns to the lefthand side of the printer. A line of characters can be printed on a continuous form or on cut forms. A single stepping motor 35, Fig. 2, operates pin wheel tractors 40, Fig. 1, for feeding continuous forms and platen 45,-Figs. 1 and 2, for feeding cut forms. Motor 35 is operated only in one direction and no reversing is required. Tractors 40 are driven via gearing 50 and drive shaft 55. Although platen 45 is also driven via gearing 50, only one type of form, continuous or cut, is being fed at any one time.

Cut forms are fed by platen 45 in cooperation with pivotable pressure rollers 60, Figs. 1 and 3. When cut forms are to be printed, the operator inserts a single form into power operated guide throat 70, which moves to the dotted line position, Fig. 3, when power is turned on. Guide throat 70 facilitates insertion of the cut form between pressure rollers 60 (shown in the retracted position) and platen 45. The cut form upon being inserted is guided by chute 75 and bottoms upon movable forms stop 80, Figs. 2 and 3. Once the document has been positioned, the operator presses a button, not shown to cause pressu...