Browse Prior Art Database

Anti-Reverse Clutch for Journal Tape Take-Up Spool

IP.com Disclosure Number: IPCOM000047420D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 39K

Publishing Venue

IBM

Related People

Junkin, ES: AUTHOR [+3]

Abstract

In point-of-sale terminal printing applications, a journal tape logging the entries and transactions for the day is normally included. It is necessary to advance the paper tape with each transaction and wind it on a take-up spool. The take-up spool is required to rotate in one direction only to maintain tension on the journal paper and to prevent an operator from starting wind-up in the wrong direction. This also prevents paper from being unspooled in the reverse direction. Current mechanisms for this task use commercially available one-way roller clutches. These clutches are metal parts and are pressed into a metal housing. It also serves as a bearing for an input drive shaft. Since it is bearing material and made of metal, it must be threaded into the machine housing.

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Anti-Reverse Clutch for Journal Tape Take-Up Spool

In point-of-sale terminal printing applications, a journal tape logging the entries and transactions for the day is normally included. It is necessary to advance the paper tape with each transaction and wind it on a take-up spool. The take-up spool is required to rotate in one direction only to maintain tension on the journal paper and to prevent an operator from starting wind-up in the wrong direction. This also prevents paper from being unspooled in the reverse direction. Current mechanisms for this task use commercially available one-way roller clutches. These clutches are metal parts and are pressed into a metal housing. It also serves as a bearing for an input drive shaft. Since it is bearing material and made of metal, it must be threaded into the machine housing. These operations for assembly and the nature of the metallic parts involved raise the cost of the resultant product unnecessarily for the stresses and duties involved. An improved design is shown in Figs. 1 and 2, Fig. 1 being a cross-sectional view of a partial printer assembly including the elements of this disclosure and Fig. 2 being an end view taken from direction AA as shown in Fig. 1. In Fig. 1, a plastic take-up spool 1 is affixed to a rotatable shaft 2. Shaft 2 may be driven by pulley 3 or other suitable means (not shown) in one direction only. In the present case, it will be assumed that clockwise rotation of shaft 2, as viewed from direction AA, will be used. A bearing 4 of plastic material is mounted to the wall 6 of the paper tape housing assembly in which a large supply of paper journal roll tape is housed but not shown. A bearing 4 also has an inner area which is formed to accommodate at least two steel rollers 5 which operate as an anti-reverse brake or lock mechanism to prevent rotation in the counterclockwise direction. Turning to Fig. 2, the end view of the mechanism is shown. Shaft 2 would be driven in the clockwise direction to rotate spool 1 clockwise and take-up the paper tape. The plastic bearing portion 4 is fixed to the housing 6 (not shown in Fig. 2) and does not rotate. Free rotation of spool 1 is permitted in the clockwise direction but is blocked in the counterclockwise direction by the jamming of rollers 5 against the inclined surfaces of the out...