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# Carrier Speed Control Logic for High Throughput Printing

IP.com Disclosure Number: IPCOM000121466D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 4 page(s) / 105K

IBM

## Related People

Hanabuchi, Y: AUTHOR [+2]

## Abstract

Disclosed is an algorithm for a carrier speed selection in a high- speed serial printer which improves the throughput in the high-speed print mode.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Carrier Speed Control Logic for High Throughput Printing

Disclosed is an algorithm for a carrier speed selection
in a high- speed serial printer which improves the throughput in the
high-speed print mode.

As print speed of the serial printer increases, there is a
possibility that the throughput in the normal-speed mode and those in
the high-speed mode are reversed in a certain print span because of
the the loss of time caused by the acceleration and keeping the
acceleration distance. Therefore, to reduce the loss of time and
improve the throughput in high-speed mode, the present method
proposes selecting the normal speed in such case.  Furthermore, the
present method enables degrading the specification of the carrier
motor because selecting suitable speed for the print span shorter
than Epw can avoid excessive temperature rise of motor winding, and
come to reduce the product cost.

The carrier motion diagram of the conventional printer is shown
in Fig. 1.  When a print cycle time in the high-speed mode is
equivalent to the normal speed mode, the print width (Epw) is
expressed as in Equation (2). The print cycle time consists of
acceleration time, printing time and deceleration time.
Tan + Tpn + Tdn  =   Tah + Tph + Tdh                   (1)
Epw = Vn * Vh * ( 1 / Aacc + 1 / Adec)   (inch)
(2)          Epw : Effective Print Width

Thus, in case the print width is shorter than Epw, the
throughput in the high-speed mode is worse than in the normal mode.
Thus, in such a case, the carrier speed should select the normal
speed for the throughput.

Normally, there are two cases about a positional relation
between a next print area and a current head position:  (i) the