Indexing apparatus for band-shaped works

Claim 1

An indexing apparatus for progressively indexing a band-shaped work, comprising: a relatively stationary frame; a spindle rotatably supported in said stationary frame; a rotary drum rotatably supported on said spindle and having such an outer periphery of cylindrical shape as can prevent slippage with said band-shaped work; starting point determining means mounted to said spindle for applying a preset load to said spindle in accordance with the single operational command, which is detected during one rotation of said spindle, so as to determine the starting point of said band-shaped work loaded to said rotary drum; end point determining means mounted to said spindle for applying a preset load to said spindle in accordance with the single operational command, which is detected during one rotation of said spindle, so as to determine the end point of said band-shaped work loaded to and delivered from said rotary drum; drive means for driving said spindle and for absorbing the difference in the number of rotations from the spindle which is retarded in its number of rotations by the preset loads given thereto from said starting point determining means and said end point determining means; rotation interrupting means interposed between said rotary drum and said drive means for interrupting the transmission of the rotations of said spindle by said drive means to said rotary drum so that the rotations of said spindle by said drive means may be transmitted to said rotary drum only when said end point determining means is to be operated; indexing means for suitably presetting the timing of the operational command, which is to be detected by said end point determing means, so as to suitably index the band-shaped work which is loaded to and delivered from said rotary drum; and idle rotation preventive means for applying a slight load to said rotary drum at all times so as to block said rotary drum from its idle rotations.