Browse Prior Art Database

Duplex Printing with a Band Printer

IP.com Disclosure Number: IPCOM000051553D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 67K

Publishing Venue

IBM

Related People

Drejza, JE: AUTHOR

Abstract

An impact band printer for printing on either side of a print medium, such as paper 10, comprises a continuous flexible type band movable in front of a platen 12. As seen in Fig. 5, the type band 11 has alternate sets of engraved type characters 13 and 14 which are the reverse of each other and are arranged in a single row. In addition to timing marks 15 sensed by transducer 16, band 11 has check point marks 17 which are sensed by transducer 18 for indicating whether the forward or reverse set of type characters 13 and 14 is in position for impacting by the bank of print hammers 19.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 70% of the total text.

Page 1 of 3

Duplex Printing with a Band Printer

An impact band printer for printing on either side of a print medium, such as paper 10, comprises a continuous flexible type band movable in front of a platen 12. As seen in Fig. 5, the type band 11 has alternate sets of engraved type characters 13 and 14 which are the reverse of each other and are arranged in a single row.

In addition to timing marks 15 sensed by transducer 16, band 11 has check point marks 17 which are sensed by transducer 18 for indicating whether the forward or reverse set of type characters 13 and 14 is in position for impacting by the bank of print hammers 19.

As shown in Fig. 2, the ribbon 2Q is dropped below shield 21 while ribbon 22 remains in position behind shield 23 when printing is to occur on the front side of paper 10 and the reverse type set 14 is in position for impact by hammers 19. As shown in Fig. 3, ribbon 22 is raised above shield 23 and ribbon 20 remains against shield 21 when printing is to occur on the back side of paper 10 when type character set 13 is in alignment with hammers 19.

In Fig. 4, the ribbon shift mechanism for a single ink ribbon arrangement consists of a pivoted left shift arm 25 having dual guide arms 26 and 27 carrying ribbon guides 28 and 29 (see the side elevation shown in Fig. 6). The guide arms 26 and 27 are of different lengths so that ribbon sections 20 and 22 are supported and guided on opposite sides of paper 10. Spring 24 provides the lift force for shift arm 2...