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Electromechanical Transfer Mechanism

IP.com Disclosure Number: IPCOM000098891D
Original Publication Date: 1958-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Oldenboom, DJ: AUTHOR

Abstract

The mechanism selectively transfers electroscopic toner images from electrographic drum 1 to paper web 2. Selective transfer is under the control of an electromagnet 3 having a pivoted armature 4 biased by spring 5. A transfer roll 6 carried by two pivoted arms 7 is urged into contact with drum 1 by a suitable spring 8. The bail 9 carried by bell crank 10 serves to engage the arm 7 for lifting roll 6-from the drum. The end of arm 11 of bell crank 10 is arranged for engagement by either or both pawl 12 and latch 13. Latch 13 has a fixed pivot 14 and a tail 15 which rests against one side of armature 4.

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Electromechanical Transfer Mechanism

The mechanism selectively transfers electroscopic toner images from electrographic drum 1 to paper web 2. Selective transfer is under the control of an electromagnet 3 having a pivoted armature 4 biased by spring 5. A transfer roll 6 carried by two pivoted arms 7 is urged into contact with drum 1 by a suitable spring 8. The bail 9 carried by bell crank 10 serves to engage the arm 7 for lifting roll 6-from the drum. The end of arm 11 of bell crank 10 is arranged for engagement by either or both pawl 12 and latch 13. Latch 13 has a fixed pivot 14 and a tail 15 which rests against one side of armature 4.

Pawl 12 is pivoted near one end to the cam arm 16 and has a tail 17 at the opposite end for engaging the side of the armature opposite that of the latch tail
15. Both pawl 12 and latch 13 are provided on corresponding sides with similarly shaped hooks for hooking the end of arm 11 on bell crank 10. Springs 18 and 19 are connected respectively to bias latch 13 and pawl 12 toward engagement with armature 4. Cam 20 is continuously operated in a synchronous manner to oscillate arm 16 so as to produce a reciprocating action of pawl 12.

By synchronizing the energization of electromagnet 3 with the motion of cam 20, the armature 4, and, hence, the electromagnet is relieved of

the burden of overcoming a relatively large force applied by spring 8 to bell crank 10, while at the same time being free to operate the latch and pawl to effect the engagement and latching of the bell crank to maintain selective,transfer operation.

When bell crank 10 i...