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Printer Package for Thermal Expansion

IP.com Disclosure Number: IPCOM000082241D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Bonafino, EJ: AUTHOR [+3]

Abstract

To compensate for many of the variations introduced by temperature changes, all major elements of a belt printer are mounted using the left (motor drive) end as a fixed reference. The right ends are allowed to float, as shown in the drawing. This applies to 1) Hammer unit 10 - 2) Front pivot casting 12 - 3) Print belt drive 14 - 4) Emitter mount 16. It should be noted that: (1) The hammer mounting bar 20 and emitter mounting bar 22 are made of steel and fixed by mount 21 and eccentric mount 23 so that their linear expansion will be nearly equal to that of the steel print belt. The hammer bar has a floating mount 27.

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Printer Package for Thermal Expansion

To compensate for many of the variations introduced by temperature changes, all major elements of a belt printer are mounted using the left (motor drive) end as a fixed reference. The right ends are allowed to float, as shown in the drawing. This applies to
1) Hammer unit 10 - 2) Front pivot casting 12 - 3) Print belt drive 14 - 4) Emitter mount 16. It should be noted that:

(1) The hammer mounting bar 20 and emitter mounting bar 22

are made of steel and fixed by mount 21 and eccentric

mount 23 so that their linear expansion will be nearly

equal to that of the steel print belt. The hammer bar

has a floating mount 27.

(2) The base casting 24 and front casting 12 may be made of

of any suitable material, since the front casting 12 has

a floating pivot 25 and they may now expand and contract

independently without affecting the relative positions

of components mounted on them. This is because one

reference line on the left of the printer was chosen for

fixing these components.

Then for any temperature condition, the belt and hammer

unit 10 expand at the same rate; the emitter "follows"

the belt expansion and thus maintain the correct timing.

The emitter is not mounted at the motor 14 because of extreme sensitivity to bearing and pulley runout. The necessary clearances would be so low as to interfere with belt removal and damage the emitter tip. By locating the emitter on a straight line section of the belt the problem of runout is...