Web threading apparatus for rotary printing machines

Details Web threading apparatus for rotary printing machines Web threading apparatus for rotary printing machines

1981-05-05

1983-09-20

Burr, Edgar S.

Printing

Rolling contact machines

Rotary

101225, 474131, B41F 1302

Patent

active

044049072

ABSTRACT:
To prevent jamming of a threading roller chain being pushed against the teeth of a sprocket wheel which, in advance of being driven, is still stationary, a portion of the guide rail guiding the roller chain (11) and opposite the sprocket wheel (24) is formed to be resiliently deflectable, for example by including a rocker element (36) or a resilient track portion (51, 52), the rocker element or the resilient track portion being maintained by a spring (46, 55) in normal, undeflected position, but permitting deflection, the spring means returning the resiliently deflectable portion to aligned, undeflected position upon proper feeding and threading of the roller chain.

REFERENCES:
patent: 1288550 (1918-12-01), Forsyth
patent: 3995553 (1976-12-01), Winterholler et al.

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