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Browse Prior Art Database

Adapter for Half Line Space Control

IP.com Disclosure Number: IPCOM000086599D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 70K

Publishing Venue

IBM

Related People

Heath, CA: AUTHOR

Abstract

In some models of line printers, the line spacing function is actuated by a stepping motor which is repeatedly pulsed to effect the line space, e.g., eight pulses for one normal line space. It is desirable to provide optional spacing, e.g., one-half line for subscripts or superscripts or three quarters of a line for condensed printing. The adapter shown above can be added to such a printer, with no modification of the circuit modules, to provide such a function.

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Adapter for Half Line Space Control

In some models of line printers, the line spacing function is actuated by a stepping motor which is repeatedly pulsed to effect the line space, e.g., eight pulses for one normal line space. It is desirable to provide optional spacing, e.g., one-half line for subscripts or superscripts or three quarters of a line for condensed printing. The adapter shown above can be added to such a printer, with no modification of the circuit modules, to provide such a function.

As indicated in Fig. 1, the printer logic includes a carriage space counter 1 which will be set to the pulse count needed for one line of print, e.g., a starting count of eight. When counter 1 is set, the adapter logic 2 will send properly spaced pulses to the carriage advance digital control 3 which will transmit stepping signals CA on line 10 to the shift register 4, which generates the phased signals for the line-space stepping motor 5. The CA signals are also fed back to counter 1 to decrement the count in the counter.

Normally, this feedback is direct. However, for half-line space modification, feedback is through an adapter 6 which can be set to provide extra pulses to counter 1, and, thereby, to reduce the number of line pulses sent to motor 5.

The adapter 6 (shown in more detail in Fig. 2) functions in a manner to add pseudo-line space (CA) pulses in the feedback to counter 1 to reduce the count to zero sooner, and, thus, to stop the line space before the normal termination.

In the adapter, the CA signals on line 10 are normally passed through the AND circuit 11, gated by the latch 12, in its clear condition, which may be reset by a reset signal on line 13 that is passed through AND circuit 19 or by a signal on control line 14. When the latch is set by a signal through AND circuit 23, its outputs will deactivate gate 11 and activate gate 16. The outputs of gates 11 and 16 are combined in OR circuit 17, which drives the CA OUT line 18.

When line CG is activated, it sets latch 20 and activates a gate 21. When latch 20 is set, its output...