公开(公告)号：EP0452358A4

公开(公告)日：1992-12-02

申请号：EP90901174

申请日：1989-11-15

申请人： DATACARD CORPORATION

发明人： HOWES, RONALD, B., JR. ,  EMMONS, THOMAS, R. ,  WARWICK, DENNIS, J.

IPC分类号： B41F17/14 ,  B41F19/02 ,  B41J3/38 ,  B41K3/36 ,  B44B5/00 ,  H01H47/32

CPC分类号： B41J3/38 ,  B44B5/0061 ,  H01H47/325

摘要： A method and apparatus for a two-pulse solenoid embossing system implementing an amplitude feedback circuit, i.e., current monitor (48), to provide precise amplitude and timing control over two current pulses (4, 5), and thereby provide precision control over the position and velocity of the embossing system's print elements (64a, 64b). To maintain the current amplitude during the second current pulse (5), the method and apparatus alternatively switches the power on and off to the solenoid coils (55) with a frequency such that a substantially constant current amplitude is maintained in the solenoid coils (55). The embossing system provides an improved solenoid body assembly (61) including a first stack of steeel laminations (93), a center block (82) and a second stack of steel laminations (81). A plunger (62) is slidably connected to the solenoid body assembly (61) by shaft (63). Cavities (79) receive dowel pins (71) which are attached to plunger (62). The cavity and dowel pin arrangement (79, 71) prevents the plunger (62) from rotating.