Web pulling system, particularly for threading a paper web in a

Details Web pulling system, particularly for threading a paper web in a Web pulling system, particularly for threading a paper web in a

1990-02-28

1991-07-09

Stodola, Daniel P.

Advancing material of indeterminate length

Threading device

With means to pull lead-end

226190, 226194, B41F 1302, B65H 2318

Patent

active

050297422

ABSTRACT:
To prevent tooth-to-tooth engagement of an interengaging gear-worm pull-in arrangement for a paper web threading system for a printing machine, a transport sprocket wheel (10) is retained in a movable bearing (16), movable along an angle (.alpha.) which is an acute angle with respect to the axis of the pull-in element (1,2), and engaged with the pull-in element by a force acting counter the direction of movement of the pull-in element. The transport wheel center is, when engageable with the pull-in element, located along a bisector (19) of an angle (.beta.), which angle (.beta.) is defined by a tangent (17a) at a first contact point (17) between the transport wheel (10, 10b) and the drive wheel (12, 12b) and a second tangent line at a second contact point (18) between the pitch circle of the transport wheel (10, 10b) and the pull-in element. The bearing of the transport wheel can shift linearly, or along a small arc, the force being generated by the weight of the wheel or by a spring. A suitable angle of deflection for the transport wheel (10, 10b) is between 30.degree. and 70.degree., preferably along a line inclined about 45.degree. with respect to the running direction of the pull-in element.

REFERENCES:
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patent: 4111565 (1978-09-01), Jagger
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patent: 4370927 (1983-02-01), Fischer
patent: 4404907 (1983-09-01), Kobler et al.
patent: 4598850 (1986-07-01), Winterholler et al.
patent: 4821060 (1989-04-01), Kurths

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