Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Rotation Sensing Frictional/Detenting Device

IP.com Disclosure Number: IPCOM000046455D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Passafiume, JE: AUTHOR [+2]

Abstract

In gear-driven platen-indexing systems, the primary problem is one of accurately detenting the platen in a line position. Inasmuch as the momentum of the system will tend to cause overshoot of the platen past its desired position, it is possible for the detent roller engaging the platen gear to reside on the high point of the gear profile and not perform the detenting operation. If this occurs, machine vibration will subsequently cause the platen to move during typing and shift the print line.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

Rotation Sensing Frictional/Detenting Device

In gear-driven platen-indexing systems, the primary problem is one of accurately detenting the platen in a line position.

Inasmuch as the momentum of the system will tend to cause overshoot of the platen past its desired position, it is possible for the detent roller engaging the platen gear to reside on the high point of the gear profile and not perform the detenting operation. If this occurs, machine vibration will subsequently cause the platen to move during typing and shift the print line.

In order to minimize overshoot and provide an approach to insuring that the detent roller is not allowed to reside on the high point of a gear tooth, the combination of elements illustrated in the figure has been devised.

Platen 10 is fixedly attached to platen shaft 12, and platen shaft 12 is rotatably supported in platen bearing 14. Platen bearing 14 is provided with two reduced diameter segments 16 and 18. Surrounding bearing segment 18 is a sleeve 20 rotationally free of platen bearing 14. Interconnecting segment 16 of platen bearing 14 with sleeve 20 is an interference spring clutch 22. Also, interconnecting sleeve 20 with the lefthand platen knob 24, formed with a protruding cylindrical portion, is spring clutch 26. Spring clutch 26 is also an interference overrunning clutch and may be rigidly connected to knob 24 by a tang or clamp, if desired. When platen 10 is rotated in the normal line feed direction (clockwise when vie...