公开(公告)号：US4023489A

公开(公告)日：1977-05-17

申请号：US655790

申请日：1976-02-06

申请人： Jack Beery

发明人： Jack Beery

IPC分类号： B41K3/64 ,  B41L35/04 ,  B65H9/00 ,  G07B17/00 ,  B41F13/24

CPC分类号： B65H9/00 ,  B41K3/64 ,  B41L35/04 ,  G07B17/00508

摘要： Electrical control circuitry for driving a rotational print head to initiate an endorsement on a single side of paper checks traveling past the print head at a relatively constant velocity, including a bistable device operatively connected to control a ramp generator for accelerating the print head at a relatively constant rate from a stopped position to a present printing velocity and then decelerating the print head to a rest state at the same relatively constant rate after completion of document endorsement. The circuitry responds to closely-spaced documents entering the endorser by interrupting the head during its deceleration mode and maintaining the head at its interrupted velocity for a certain time delay in order to reaccelerate the head back to printing velocity at the same relatively constant rate in time for proper endorsement.

摘要翻译： 用于驱动旋转打印头以在相对恒定的速度上行进通过打印头的旋转打印头开始认可的电气控制电路，包括可操作地连接以控制斜坡发生器的双稳态装置，用于相对地加速打印头 从停止位置到当前打印速度的恒定速率，然后在文件签注完成之后以相同的相对恒定的速度将打印头减速到休息状态。 电路通过在其减速模式期间中断头部并且将头部保持在其中断速度一定的时间延迟来响应进入贴标机的紧密间隔的文件，以便以相同的相对恒定的速率重新加速头部到打印速度 正确认可。

公开(公告)号：US4030412A

公开(公告)日：1977-06-21

申请号：US674367

申请日：1976-04-07

申请人： Edward M. Springer

发明人： Edward M. Springer

IPC分类号： B41L11/12 ,  B41L35/04 ,  B41L11/08

CPC分类号： B41L11/12 ,  B41L35/04

摘要： A duplicating machine has an impression roll positioned to press copy sheets against a master sheet on a drum which is rotatable by an electric drive motor through a coil spring type clutch. The clutch consists of a coil spring having an interference fit with cylindrical friction surfaces on driving and driven clutch members which are connected respectively to the motor and drum. The coil spring is helically wound in a direction to tighten the interference fit when the motor rotates the driving clutch member to turn the drum in a printing direction; conversely, the interference fit loosens when the driving end of the coil spring is held, enabling the driving clutch member to rotate freely. A tang on the driving end of the spring is positively connected to a cylindrical release collar surrounding the spring. The driven end of the spring has a positive tang connection to the driven clutch member and drum. Thus, rotation of the release collar and drum are synchronized within a range determined by the torsional elasticity of the spring. A stop arm is movable to and from a stop position engaging one or more detent recesses in the release collar. Engagement of the stop arm within one of the recesses, at the end of a printing run, automatically stops the collar. This disengages the clutch by releasing the interference fit between the spring and the driving clutch member. The drum stops at a position determined by the stopped position of the release collar. A plurality of detent recesses are circumferentially and axially spaced about and along the axis of the release collar. The stop arm is selectively engageable with one or the other of the recesses to stop the drum at different rotated positions to enable the ends of different length master sheets to clear the impression roll. A manually operable starter arm assembly releases the stop arm from the detent recess on the release collar and simultaneously closes a switch to actuate the drive motor. Conversely, when the last copy sheet is fed into the machine, the stop arm automatically drops into the selected recess to stop the release collar to disengage the clutch while simultaneously opening the switch to deactuate the driving motor and allow the drive train to coast to a stop.