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Throw Length Indicator

IP.com Disclosure Number: IPCOM000083528D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Herron, TF: AUTHOR

Abstract

In the manufacture of multiply business forms, it is necessary to punch holes along one or both edges of the individual plies at a fixed dimension apart at the same time the form is printed. These holes allow the various plies to be collated together in register, ply-to-ply.

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Throw Length Indicator

In the manufacture of multiply business forms, it is necessary to punch holes along one or both edges of the individual plies at a fixed dimension apart at the same time the form is printed. These holes allow the various plies to be collated together in register, ply-to-ply.

During the printing operation it is necessary to apply considerable tension to the paper web 10. This tension stretches the web in the press. The line holes 9 are punched through this stretched web. Later, if the forms are placed in a collator, which is essentially a nontension machine, the paper relaxes and the holes tend to come closer together. If too much tension has been applied to the web in printing, these holes will not fit the pins and defective forms result. This variation in line hole spacing is called "throw-length".

The device shown measures the length of the paper coming in and compares it with the length going out and is unaffected by the paper or machine variables. Operation is as follows:

The incoming roller 1 is of such a diameter that its circumference is a function of the web measuring criterion, (1 ft, 1 meter, etc.) say one foot. It is made of aluminum with a polyurethane "tire" to ensure no slippage. Directly connected to the roller 1 is a disc 2 with one hole of proper dimensions to trigger the relay controlled by photocell PC1. This signal is carried to a predetermined counter (PDC) 4 whose coil 11 is set to close its contact 12 after fifty revolutions of the disc 2. (At 49 revolutions a NC contact 19 o...