公开(公告)号：DE2344923A1

公开(公告)日：1974-03-14

申请号：DE2344923

申请日：1973-09-06

Applicant: IBM

Inventor： BONAFINO EDWARD JOSEPH ,  GILBERT RICHARD LYMAN ,  MAKO JOHN

IPC: B41J1/20 ,  B41J7/96 ,  G06K15/00 ,  G06K15/06

Abstract: A type belt having spaced apart type characters thereon, also has a plurality of timing marks, one for keeping track of the different character positions. A transducer is positioned to sense the timing marks as they move in a horizontal direction for operating print controls in timed relation with the positions of the type characters as they move along the print line and also detect differences in amplitude of the transducer output signals caused by vertical movement of the type belt. The output is used to operate indicating means which tells which position will print next, and which can also be used to enable the operator to detect misregistration of the type belt, so that the operator may correct it.

公开(公告)号：DE2405315A1

公开(公告)日：1974-10-17

申请号：DE2405315

申请日：1974-02-05

Applicant: IBM

Inventor： GILBERT RICHARD LYMAN ,  HRYCK MICHAEL DAVID

IPC: B41J1/20 ,  B41J9/48 ,  G06K15/00 ,  G06K15/06 ,  G06K15/08

Abstract: Print hammers in a printer are energized from a source of electrical energy whose voltage may vary. The motor driving the type carrier is energized from an oscillator whose frequency is caused to vary with the voltage of the print hammer source to prevent misregistration between the print hammers and the type characters on the type carrier. The duration of the pulses energizing the print hammers is controlled by print scan pulses derived from timing marks on the type carrier to provide constant print density.

公开(公告)号：DE2360323A1

公开(公告)日：1974-07-04

申请号：DE2360323

申请日：1973-12-04

Applicant: IBM

Inventor： GILBERT RICHARD LYMAN ,  HAMILTON JOHN GREGORY ,  HASEGAWA TATSUO ,  ROSS CHARLES OWEN

IPC: B41J7/36 ,  B41J1/20 ,  B41J9/46 ,  B41J9/48 ,  G06K15/06 ,  G06K15/08 ,  B41J9/38

Abstract: Impression control for an impact printer is provided by changing the width of the pulse applied to the print hammers in accordance with the thickness of the forms on which printing is being performed and in accordance with the voltage of the source energizing the print hammers, so as to maintain a constant impact force to provide uniform print density for different forms thicknesses. Misregistration of characters caused by a variation in the rate of movement of the print hammer is compensated for by changing the start time of the pulse energizing the hammer.