Printing – Selective or progressive – Bed and platen machines
Patent
1987-12-02
1989-04-04
Pearson, Charles
Printing
Selective or progressive
Bed and platen machines
101 9343, B41J 918, B41J 938
Patent
active
048175226
ABSTRACT:
A printer device having a hammer mechanism for printingly impacting a type drum by means of hammer springs. Hammers are rotatably controlled to retracted positions where the hammers are not brought into contact with a reset cam in each printing cycle, so that unnecessary contact between the hammers and the reset cam can be eliminated, frictional loss and noise can be reduced. The hammers are temporarily reset to first retracted positions upon completion of printing, and thereafter, turned to the aforesaid second retracted positions.
The release of locking of the hammers is effected by feeding a printing command to electromagnetic means, whereby an armature of the electromagnetic means moves hammer holding members to thereby release locking of the hammers.
A predetermined pre-stroke is secured between the hammer holding members and the armature at the time of non-excitation of the electromagnetic means, whereby kinetic energy is accumulated while the armature moves within the aforesaid pre-stroke due to the excitation of the electromagnetic means, so that the hammer holding members can be reliably transferred.
REFERENCES:
patent: 3902419 (1975-09-01), Pflugbeil et al.
Citizen Watch Co. Ltd.
Pearson Charles
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