Abstract: An improved drive for a scanning optical system in a photocopier is disclosed. The drive incorporates an adjustable capstan and precision tapes as well as cables. The precision tapes are used between the two carriages which mount the optics because precise control of length in this portion of the system is critical. Cables are used in the remainder of the drive where flexibility in all directions is important. There is also a single drive embodiment. Also disclosed is a method for proper alignment of the carriages after field replacement of a broken cable.
Type:
Grant
Filed:
February 14, 1985
Date of Patent:
January 6, 1987
Assignee:
International Business Machines Corporation
Inventors:
Rick O. Jones, Walter F. Price, Jr., Glenn E. Siemer, Michael H. Ulrich
Abstract: The present invention relates to a dot matrix printer which makes use of multiple dot patterns distributed on the cylinder, belt, hand or drum of a line printer to provide an improved printing throughput for an all addressable line printer. In a dot-helix matrix printer, different arrangements of the dots are used which can be varied in position and spacing to increase printing speed. On a belt, band or drum line printer, multiple dot patterns are given a predetermined distribution. More specifically, arrangements of dots are used which provide enhanced performance due to the fact that they are determined by an analysis of the statistical occurrence of a particular dot pattern in a character set. The higher statistical probability dot patterns are used more often on the belt, band or drum.
Type:
Grant
Filed:
May 15, 1985
Date of Patent:
June 24, 1986
Assignee:
International Business Machines Corporation
Inventors:
Eric G. Lean, Keith S. Pennington, Samuel C. Tseng, Han C. Wang