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Optimization of Print Speed

IP.com Disclosure Number: IPCOM000061498D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Leontiades, KL: AUTHOR [+4]

Abstract

This article discloses a technique for optimizing the use of a printer by maximizing the print speed without exceeding the design capabilities of the printer. Print lines are built in a RAM (random-access memory) buffer, and the stored image data is examined to determine the speed at which the line may be printed without exceeding design parameters. A determination of the print speed may take into account the following items: Horizontal Density - the number of times a wire is fired per inch. The print head speed is inversely related to the print wire cycle time and horizontal density. Adjacency - whether or not the same wire is to fire in adjacent positions. If there are no adjacent dots, the print head speed may be doubled as a function of the print wire cycle time.

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Optimization of Print Speed

This article discloses a technique for optimizing the use of a printer by maximizing the print speed without exceeding the design capabilities of the printer. Print lines are built in a RAM (random-access memory) buffer, and the stored image data is examined to determine the speed at which the line may be printed without exceeding design parameters. A determination of the print speed may take into account the following items: Horizontal Density - the number of times a wire is fired per inch. The print head speed is inversely related to the print wire cycle time and horizontal density. Adjacency - whether or not the same wire is to fire in adjacent positions. If there are no adjacent dots, the print head speed may be doubled as a function of the print wire cycle time. Power Supply Current Required - the power required to print a line. This is the maximum power required for initialization, idle time, the number of wires to be fired and the movement and velocity of the print head. The print line may be divided into sections, with the power for printing each section being determined by the number of wires to be fired and the movement and velocity of the print head. A speed is selected that will not take more power than the power supply is capable of providing for the section having the highest power requirement. Individual Print Wire Cooling Capacity - the heat generated or dissipated by each individual print wire based upon the number of times the wire will fire in a print line and the amount of cooling time that elapses since the beginning of a previous print line. This limits the firing of a single wire so that the energizing print wire coil does not overheat. Due to the thermodynamic characteristics of the print head, the firing rate...