Browse Prior Art Database

Type Disk Hammer Detent

IP.com Disclosure Number: IPCOM000083689D
Original Publication Date: 1975-Jul-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Harrington, RH: AUTHOR [+3]

Abstract

Printing alignment is improved and print impression is more uniform by providing type fingers on a print disk which are detentable by the print hammer.

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Type Disk Hammer Detent

Printing alignment is improved and print impression is more uniform by providing type fingers on a print disk which are detentable by the print hammer.

In Fig. 1, type finger 1 and hammer 2 are formed in complementary vee shape so that the hammer aligns the finger during impact. The hammer 2 is made relatively wide to prevent tilting of the type finger 1, so that impression is uniform across the type face. A relief 3 is formed in the hammer 2 to prevent accumulation of dirt at the base of the notch, and the corners 4 of the hammer are chamfered to minimize interference.

The apex of the vee at the rear of each type finger 1 is curved in the radial plane 5 and the radius of the apex (measured from the shaft center) is the same as the radius of the center of gravity of the character 6 to be printed. This assures uniform density of impression in the vertical direction. Furthermore, the vee need not be sharp; a flat of about 14 mils width facilitates relative radial motion between the hammer and type as the hammer 2 pushes the type finger 1 forward.

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