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Browse Prior Art Database

Impression Control for a Typewriter

IP.com Disclosure Number: IPCOM000049195D
Original Publication Date: 1982-May-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Simpson, HW: AUTHOR

Abstract

In daisy wheel type printers, it is desirable to provide some means to allow for operator control of print impression. This is necessary when the printer or typewriter must accommodate varied numbers of carbons. The disclosed print hammer allows for operator control of print impression.

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Impression Control for a Typewriter

In daisy wheel type printers, it is desirable to provide some means to allow for operator control of print impression. This is necessary when the printer or typewriter must accommodate varied numbers of carbons. The disclosed print hammer allows for operator control of print impression.

To this end, and referring now to Fig. 1, a typical solenoid-type print hammer 10 is illustrated therein. As shown, the print hammer 10 includes a casing 11 with a solenoid coil 12 therein wrapped around a pole piece core 13 having a central tunnel-like aperture 14 therein. Mounted for reciprocation in the tunnel 14 is an armature 15 which is connected to an armature extension 16, terminating in an enlarged ramlike portion 17. An anvil 18 is mounted at the terminal end of the ram 17 and formed so as to permit the striking of individual spokes of the conventional daisy wheel-type print wheel. The armature 15, at its opposite terminal end 15a, butts against an adjustment means 20, in the illustrated instance a plug with a finger grip 21 thereon which allows the plug to be rotated inwardly or outwardly to adjust the air gap between the pole pieces 13 and the armature 15.

Inasmuch as impact force is controlled by the momentum of the armature, by increasing the air gap, the magnetic force drops (assuming fixed current and time). Thus. by unscrewing the adjustment means 20 some predetermined amount, the area under the force-time curve, illustrated in...