Preloading web cleaner

Claim 2

In a xerographic copier of the type wherein an elongated cleaning web engages in wiping contact with the surface of a rotating xerographic drum, the improvement comprising: a support means for supporting the cleaning web; a pivot on which said support means is mounted for pivotal movement between a first position whereat the cleaning web is held out of contact with the surface of said drum and a second position whereat the cleaning web is in wiping contact with the surface of said drum; a selectively energizable clutch; latching cam means including a cam means and a latch element, said cam means being positioned adjacent said support means; means for energizing said clutch; means responsive to said clutch for driving said latching cam means whereby said cam means pivots said support means from said first position to said second position, and said latch element is moved from an initial position to a latching position; latch means at said latching position for latching said latch element; and, switch means operated by said latch element when at said latching position for de-energizing said clutch.

Claim 3

The improvement as claimed in claim 1 wherein said latch means includes a latch lever and a solenoid for moving said latch lever into position to latch said latch element at said latching position.

Claim 4

The improvement as claimed in claim 2 and further comprising: means for selectively energizing said solenoid to move said latch lever into position to latch said latch element; first bias means tending to move said latch lever away from the position where it latches said latch element; and second bias means for driving said support means toward said first position when said solenoid Is deenergized.

Claim 5

The improvement as claimed in claim 3 wherein the means for selectively energizing said solenoid and for energizing said clutch comprises means for energizing said solenoid and clutch any time said drum rotates.

Claim 6

The improvement as claimed in claim 4 wherein said solenoid includes an armature, and a tension spring connecting said armature to said latch lever.

Claim 7

The improvement as claimed in claim 3 wherein said latch cam means is mounted on a shaft for pivotal movement.

Claim 8

The improvement as claimed in claim 6 wherein said support means engages said cam means and pivots said latch cam means when said support means is driven by said second bias means.

Claim 9

In a xerographic copier, the combination comprising: a rotatable xerographic drum; web support means mounted for pivotal movement between a first position whereat a cleaning web supported by said support means is held out of contact with said drum, and a second position whereat the web engages said drum in wiping contact; a selectively energizable clutch means; drive means for driving said drum and said web, and said clutch means; latchable cam means driven by said clutch means for pivoting said web support means from said first to said second position, said latchable cam means including a latch element which moves to a latching position as said web support means is pivoted to said second position; a solenoid and means actuated by said solenoid for latching said latch element at said latching position; means selectively and concurrently energizing said drive means, said clutch means, and said solenoid to thereby drive said drum and said web, drive said latchable cam means to pivot said support means to said second position, actuating said latch means to latch said latch element; switch means operated by said latch element when it is in said latching position for de-energizing said clutch means and, bias means normally biasing said support means toward said first position and said latch element away from said latching position when said solenoid is not energized.

Claim 10

In a xerographic copier, the combination comprising: a rotatable xerographic drum; web support means mounted for pivotal movement between a first position whereat a cleaning web supported by said support means is held out of contact with said drum, and a second position whereat the web engages said drum in wiping contact; a selectively energizable clutch means; drive means for driving said drum and said web, and said clutch means; latchable cam means driven by said clutch means for pivoting said web support means from said first to said second position, said latchable cam means including a latch element which moves to a latching position as said web support means is pivoted to said second position; a solenoid and means actuated by said solenoid for latching said latch element at said latching position; means selectively and concurrently energizing said drive means, said clutch means, and said solenoid to thereby drive said drum and said web, drive said latchable cam means to pivot said support means to said second position, actuating said latch means to latch said latch element; switch means operated by said latch element when it is in said latching position for de-energizing said clutch means and, bias means normally biasing said support means toward said first position and said latch element away from said latching position when said solenoid is not energized.

Claim 11

The combination as claimed in claim 8 wherein said latchable cam means includes two cams, said cams and said latch element being mounted on a shaft for pivotal movement, and means including a closed loop drive element driven by said clutch means for imparting rotational movement to said shaft, said clutch means including an electro-mechanical clutch.

Claim 12

The combination as claimed in claim 9 wherein said latch means includes, a latch lever, a tension spring connecting said lever to the armature of said solenoid, and, a further bias means tending to move said latch lever to free said latch element when said solenoid is not energized.