초록 ▼

A guide apparatus for a continuously moving web has an upstream fixed roller and a downstream fixed roller substantially parallel to each other and defining a plane. A fixed and substantially closed box carries these rollers and a frame which is offset from the plane and pivotal on the box about a f

A guide apparatus for a continuously moving web has an upstream fixed roller and a downstream fixed roller substantially parallel to each other and defining a plane. A fixed and substantially closed box carries these rollers and a frame which is offset from the plane and pivotal on the box about a frame axis substantially perpendicular to the plane. A pair of adjustment rollers are rotatable on the frame about parallel adjustment-roller axes fixed relative to each other and to the frame. Thus a continuously moving web can pass along the path over the upstream roller, then over one after the other of the adjustment rollers, and finally over the downstream roller. A sensor is mounted on the box adjacent the downstream roller and is connected via a control means to a motor inside the box that automatically pivots the frame whenever the web position detected by the sensor deviates from a predetermined desired position. Thus all of the critical circuitry and moving parts of the apparatus are safely within the closed box.

대표청구항 ▼

A guide apparatus for a continuously moving web, said apparatus comprising: an upstream fixed roller and a downstream fixed roller substantially parallel thereto and defining a plane therewith: a fixed and substantially closed box between said upstream and downstream rollers; a frame offset from sai

A guide apparatus for a continuously moving web, said apparatus comprising: an upstream fixed roller and a downstream fixed roller substantially parallel thereto and defining a plane therewith: a fixed and substantially closed box between said upstream and downstream rollers; a frame offset from said plane and pivotal on said box about a frame axis substantially perpendicular to said plane; a pair of adjustment rollers rotatably pivoted on said frame about parallel adjustment-roller axes fixed relative to each other and to said frame and offset from said plane, whereby a continuously moving web can pass along a path over said upstream roller, over one of said adjustment rollers, over the other adjustment roller, and over said downstream roller; a sensor mounted along said web downstream of said other adjustment roller; a motor inside said box connected to said frame and energizable to pivot said frame on said box about said frame axis; and control means in said box connected between said sensor and motor for pivoting said frame on said box when the web position detected by said sensor deviates for a predetermined desired position.