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Uniform Impact Impression

IP.com Disclosure Number: IPCOM000096870D
Original Publication Date: 1962-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Bear, ME: AUTHOR

Abstract

Print wheel 1 having engraved type elements 2 is fastened to the upper end of rotatable shaft 3. Pulley 4 connected to the lower end of shaft 3 is rotated by tape 5 which is connected to a rotate displacement mechanism (not shown). Tape 5 is moved translationally in either direction a predetermined number of increments to set a selected character 2 on wheel 1 for printing on a print medium overlaying platen 6. After wheel 1 is positioned, print cam 7 rotates to drive print cam follower 8 in a counterclockwise direction. A slotted portion of follower 8 imparts a motion to rocker assembly 9 through pin 10. Rocker assembly 9 moves clockwise on its pivot shaft 11 causing print wheel 1 to strike platen 6. Cam 12, mounted on the same shaft 13 with cam 7, restores wheel 1 and prevents it from rebounding.

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Uniform Impact Impression

Print wheel 1 having engraved type elements 2 is fastened to the upper end of rotatable shaft 3. Pulley 4 connected to the lower end of shaft 3 is rotated by tape 5 which is connected to a rotate displacement mechanism (not shown). Tape 5 is moved translationally in either direction a predetermined number of increments to set a selected character 2 on wheel 1 for printing on a print medium overlaying platen 6. After wheel 1 is positioned, print cam 7 rotates to drive print cam follower 8 in a counterclockwise direction. A slotted portion of follower 8 imparts a motion to rocker assembly 9 through pin 10. Rocker assembly 9 moves clockwise on its pivot shaft 11 causing print wheel 1 to strike platen 6. Cam 12, mounted on the same shaft 13 with cam 7, restores wheel 1 and prevents it from rebounding. Pulley 4 is spring loaded in one direction to take up the slack in tape 5.

Uniform printing pressure is obtained by varying the length of stroke of wheel 1 to correspond with variations in the area of type characters 2. This is accomplished by making wheel 1 eccentric relative to shaft 3. Characters 2 are located around wheel 1 in relation to their area and the hub location. The hub, i.
e., the shaft 3 of print wheel 1, by being eccentric, provides an increased throw for the larger area characters and a decreased throw for smaller area characters. A gradual change in energy is accomplished that matches the arrangement of different area characte...