Adhesive binder

In an adhesive binding machine for collated paper, said machine including a frame carrying a device for applying a cover sheet to said paper about one trimmed edge having glue applied thereon, said cover applicating device including nipper means having slidable opposed table portions for supporting said cover and pressing the cover about said trimmed edge, said table portions having corresponding lower and upper positions and first and second spaced positions wherein the table portions are more closely positioned to each other when in said second position, the improvement comprising actuator means including a cyclical motor means for actuating the actuator, said actuator means for shifting said table portions from said lower position into said upper position when supporting said cover to urge the cover into contact with said trimmed edge and shifting said table portions from said first position into said second position during one cycle of said motor means, said nipper means including camming means connected between said actuator means and said table portions for shifting said table portions from said first position to said second position, said camming means including a pair of bellcranks, one arm of each bellcrank connected to a table portion and the other arm of each bellcrank eccentrically connected to a roller cam wherein upper movement of the roller cam causes the connected table portion to shift into said second position, upper and lower rigidly spaced cam retainer plates, each roller cam being located between and horizontally shiftable between said retainer plates, said actuator means including a housing connected at its upper end to said machine frame and having a bore therethrough, a hollow cylindrical shaft fitting slidably within said housing bore and having an upper end and a lower end, a vertically shiftable support carrying said table portions and camming means, said hollow shaft upper end being connected to said support, said hollow shaft lower end carrying a stop engageable with the lower end of said housing, a second shaft fitting slidably within said hollow shaft and pivotally connected at its lower end to a motor means eccentric crank, said second shaft having an upper end attached to said lower cam retainer plate, biasing means between said second shaft and hollow shaft for causing the joint upper movement of the second shaft and hollow shaft relative to said housing to cause said support to shift upwardly and said table portions to shift into said upper position, said biasing means yielding to permit upper movement of the second shaft relative to the hollow shaft when said stop contacts the lower end of said housing to cause said cam retainer plates to shift upwardly and said table portions to shift into said second position.