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Program Controlled Variable Line Spacing

IP.com Disclosure Number: IPCOM000086380D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Crandall, DC: AUTHOR

Abstract

In some of the commercial printing devices, the advance of the paper from line-to-line is powered by a stepping type motor. Normally, the stepping motor is controlled by an eight-step counter which decrements a line counter each time the counter is restored to zero. The line counter can also be set to a number of lines to be passed. When it is desired to provide for programmed variable width line spacing, a small program extension can be used to call for a predetermined number of stepper pulses.

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Program Controlled Variable Line Spacing

In some of the commercial printing devices, the advance of the paper from line-to-line is powered by a stepping type motor. Normally, the stepping motor is controlled by an eight-step counter which decrements a line counter each time the counter is restored to zero. The line counter can also be set to a number of lines to be passed. When it is desired to provide for programmed variable width line spacing, a small program extension can be used to call for a predetermined number of stepper pulses.

As indicated in the flow chart diagram, Fig. 1, when a line space operation, block 1, is detected, a variable line space test, block 2, is made. If a normal line space is to be made, the patch hook branch, block 3, will be off and the stepper motor pulses from pulser 11 will be directed to decrement an eight-step counter 12, block 4. When the counter is decremented to zero, a signal is sent to the line counter 13 to increment it. If the line counter reading is not equal to the preset number for the lines to be moved, block 5, control is returned to the input to block 3 for a repeat of the line space movement.

When the format of the data being printed requires a different line spacing movement, the variable line space control block 2, will be set to branch the program to a program, block 6, which will determine how many line space increments are to be made to get the desired format. This program will set, block 7, the patch hook, bl...