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Hammerless Printer

IP.com Disclosure Number: IPCOM000083249D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 3 page(s) / 56K

Publishing Venue

IBM

Related People

Thorne, WD: AUTHOR

Abstract

Fig. 1 illustrates, in partial cross-section, a hammerless printer having individual flexible fingers 1 arranged in a radial pattern about the hub of a central disk 2, of which fingers 1 may be an integral part. Individual type faces 3, bearing an appropriate font, are affixed to each of the fingers 1 near the outer free end. The back side of each type face 3 may be provided with a means for direct attachment to spring fingers 1, or may extend through the spring finger and form an integral unit with a magnetic slug 4, as shown.

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Hammerless Printer

Fig. 1 illustrates, in partial cross-section, a hammerless printer having individual flexible fingers 1 arranged in a radial pattern about the hub of a central disk 2, of which fingers 1 may be an integral part. Individual type faces 3, bearing an appropriate font, are affixed to each of the fingers 1 near the outer free end. The back side of each type face 3 may be provided with a means for direct attachment to spring fingers 1, or may extend through the spring finger and form an integral unit with a magnetic slug 4, as shown.

Each spring finger 1 is supported from the central hub of the disk 2 and passes across a fulcrum point in the form of a ring 5, which may be the edge of a formed cup 6 oriented as shown in Fig. 1. Each spring finger 1 may be deflected as shown with portion 5 of cup 6 acting as a fulcrum, so that tension is generated in the spring finger as it is deflected against the fulcrum 5. A separate stop 7 may also be an integral part of cup 6 as an outer rim thereof, as shown, to halt the flexing of each spring finger 1 after a controlled amount of deflection between it and fulcrum 5 has occurred.

The degree of tension or flex may be further regulated, as illustrated in Fig. 1, by providing a ring or washer 8 to deflect the center portion of the disk 2 further relative to fulcrum 5. This can be accomplished by an adjustment nut 9 traveling on threads, which may be integral with a motor drive shaft 10 mounted in a suitable bearing 11 to be driven by a motor 12.

The individual spring fingers 1 are flexed by a circular permanent magnet 13 carried in an outer rim or flange of a fixed wheel 14, which is mounted concentrically with disk 2, as shown. At a fixed point in the travel of disk 2, opposite a desired printing position, a separate control winding electromagnet 15 consisting of a coil 16 and an appropriate armature 17 is placed in fixed relationship to the permanent magnet 13.

Electromagnet 15 is e...