Browse Prior Art Database

Paper Roll Supply Sensor

IP.com Disclosure Number: IPCOM000050528D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Langley, HL: AUTHOR [+3]

Abstract

Printers of the journal paper receipt type employ roll paper supplies. Paper rolls are supplied on cores and a provision is made in the printer housing to contain one or more rolls. A problem arises in easily detecting the low supply condition in order to alert an operator to feed a new roll through the supply path.

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Paper Roll Supply Sensor

Printers of the journal paper receipt type employ roll paper supplies. Paper rolls are supplied on cores and a provision is made in the printer housing to contain one or more rolls. A problem arises in easily detecting the low supply condition in order to alert an operator to feed a new roll through the supply path.

The figure illustrates a simple solution. Paper roll 1 is wound on core 2 and may be of any of a variety of diameters ranging from two to six inches approximately. The core 2 must be sensed and removed when the paper supply 1 has been exhausted. This is accomplished by providing an opening 3 in the bottom of an inclined V ramp of molded plastic or a similar material, indicated as slope 6.

The opening 3 is the appropriate size to permit the diameter of the core 2 to pass but will not admit the greater diameter of the roll 1.

A lever arm 4 connected to a microswitch 5 is activated when the core 2 passes through the opening 3. Alternatively, an optical sensing transducer of a sort well known in the art could be employed to detect the presence of the core 2 in the opening 3.

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