Browse Prior Art Database

Single Row Sensing System for Band Printers

IP.com Disclosure Number: IPCOM000040436D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Cakerice, LJ: AUTHOR [+2]

Abstract

A sensing system utilizes a print band having a single row of emitter timing slots of two different widths, as shown in Fig. 1. Emitter timing slots 1 are etched into the print band 2 of a band printer. An optical sensor 3 is positioned to detect the presence or absence of the timing slots, and detect their relative widths. The slots are the same size but represent two different types, namely, "home slots" H and "fire slots" F. The home slots are located on the same track or line as the firing slots as contrasted to the typical arrangement where the home slots and fire slots are vertically displaced on different tracks. A home slot precedes a fire slot by a predetermined distance D, and a home slot is differentiated from a fire slot by an identifier slot A directly upstream of the home slot.

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Single Row Sensing System for Band Printers

A sensing system utilizes a print band having a single row of emitter timing slots of two different widths, as shown in Fig. 1. Emitter timing slots 1 are etched into the print band 2 of a band printer. An optical sensor 3 is positioned to detect the presence or absence of the timing slots, and detect their relative widths. The slots are the same size but represent two different types, namely, "home slots" H and "fire slots" F. The home slots are located on the same track or line as the firing slots as contrasted to the typical arrangement where the home slots and fire slots are vertically displaced on different tracks. A home slot precedes a fire slot by a predetermined distance D, and a home slot is differentiated from a fire slot by an identifier slot A directly upstream of the home slot. Identifier slot A has a different width in the direction of band travel than the home and fire slots H and F, respectively.. In operation, the sensor locates the different-width identifier slot A, and relays a signal to the system control 4 that the next slot is a home slot. When a home slot is sensed, the emitter switch of the system control 4 is enabled to transmit an electric pulse to the print actuators 5. When the fire slot is sensed, the print actuators are pulsed. This single-row sensing system is compatible with a dual-row system by the addition of a second optical sensor positioned downstream of the primary optical sensor a...