초록 ▼

Disclosed is a system for bidirectionally guiding web, such as tape in magnetic tape recording/reproducing apparatus. The system eliminates the necessity for edge guides, reduces stresses in web resulting in longer web life, and effects accurate tracking of the web as it is transported in opposite d

Disclosed is a system for bidirectionally guiding web, such as tape in magnetic tape recording/reproducing apparatus. The system eliminates the necessity for edge guides, reduces stresses in web resulting in longer web life, and effects accurate tracking of the web as it is transported in opposite directions. The system includes a plurality of edgeless cylindrical guide rollers mounted on members which are pivoted together. The system includes a plurality of edge sensors and linear servo motors. The edge sensors measure the web edge position and the linear servo motors control the amount of rotation about a pivotal axis which coincides with the center line of a span of web. In this way, web edge position is controlled without any frictional sliding contact between the web and guiding rollers and without the use of edge guides which damage the web edge.

대표청구항 ▼

A web guiding system comprising: first and second members; first flangeless cylindrical roller means and second flangeless cylindrical roller means respectively mounted on said first and second members for guiding a web along first, second and third web spans in respective first, second and third su

A web guiding system comprising: first and second members; first flangeless cylindrical roller means and second flangeless cylindrical roller means respectively mounted on said first and second members for guiding a web along first, second and third web spans in respective first, second and third substantially parallel planes; wherein said web has longitudinal edges and a center line running longitudinally between said edges; first mounting means for pivotally mounting said first member about a first pivotal axis which substantially coincides with the center line of said first web span; second mounting means for pivotally mounting said first and second members together about a second pivotal axis which substantially coincides with the center line of said second web span; sensor means for sensing the edge of said web at respective positions substantially near said second web span, and substantially near said third web span; and drive means, coupled to said first and second members, for pivoting said first member about said first pivotal axis, when said sensor means detects an error in position of the edge of said web from a first predetermined position substantially near said second web span, to return said web edge to said first predetermined position by pivoting said second web span about said first pivotal axis; and for pivoting said second member about said second pivotal axis, when said sensor means detects an error in the position of the edge of said web from a second predetermined position substantially near said third web span to return said web edge to said second predetermined position by pivoting said third web span about said second pivotal axis.