公开(公告)号：IT1149984B

公开(公告)日：1986-12-10

申请号：IT2295680

申请日：1980-06-23

Applicant: IBM

Inventor： LLOYD EDWARD RAPHAEL ,  MAROWSKI RAYMOND MICHAEL

IPC: B41J19/36 ,  B41J19/34 ,  B41J19/44 ,  B41J19/58 ,  B41J19/62 ,  B41J

Abstract: A mechanism which will function to allow the escapement of the carriage of a typewriter in one of two predetermined escapement pitches and be capable of backspace operation from a single backspace input for both pitches regardless of which escapement pitch is selected. Escapement ratchets for the two selected pitches are combined, together with a backspace ratchet. Each of the escapement ratchets are engageable by an escapement pawl and the engagement of a pawl with a particular ratchet will determine the pitch within which the escapement system will function. A backspace ratchet is combined with the escapement ratchets and fixedly attached thereto to provide the backspace drive. The backspace ratchet is selectably engageable by the backspace pawl for causing rotation in the opposite direction of that normally utilized for escapement. All motion of the escapement ratchets or backspace ratchet is transmitted through a pinion mounted to the ratchet assembly and, in turn, is transmitted to the paper carriage rack.

公开(公告)号：DE3275517D1

公开(公告)日：1987-04-09

申请号：DE3275517

申请日：1982-12-02

Applicant: IBM

Inventor： APPLEGATE STEVEN LEWIS ,  LLOYD EDWARD RAPHAEL

IPC: B41J2/39 ,  B41J2/335 ,  B41J2/395 ,  H01R12/04 ,  H04N1/032 ,  B41J3/20

公开(公告)号：DE3062951D1

公开(公告)日：1983-06-09

申请号：DE3062951

申请日：1980-05-29

Applicant: IBM

Inventor： LLOYD EDWARD RAPHAEL ,  MAROWSKI RAYMOND MICHAEL

IPC: B41J19/36 ,  B41J19/34 ,  B41J19/44 ,  B41J19/58 ,  B41J19/62

Abstract: A mechanism which will function to allow the escapement of the carriage of a typewriter in one of two predetermined escapement pitches and be capable of backspace operation from a single backspace input for both pitches regardless of which escapement pitch is selected. Escapement ratchets for the two selected pitches are combined, together with a backspace ratchet. Each of the escapement ratchets are engageable by an escapement pawl and the engagement of a pawl with a particular ratchet will determine the pitch within which the escapement system will function. A backspace ratchet is combined with the escapement ratchets and fixedly attached thereto to provide the backspace drive. The backspace ratchet is selectably engageable by the backspace pawl for causing rotation in the opposite direction of that normally utilized for escapement. All motion of the escapement ratchets or backspace ratchet is transmitted through a pinion mounted to the ratchet assembly and, in turn, is transmitted to the paper carriage rack.