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Browse Prior Art Database

Printer Impact Control

IP.com Disclosure Number: IPCOM000085389D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Mathews, RD: AUTHOR

Abstract

The need for having both an impact control and copy control is eliminated with a print wheel, which is positionable relative to a print hammer and a platen.

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Printer Impact Control

The need for having both an impact control and copy control is eliminated with a print wheel, which is positionable relative to a print hammer and a platen.

In order to handle situations where the number of carbon copies varies, present printing systems are provided with both copy control and impact control apparatus operable upon manipulation of levers. Manipulating the copy control lever causes displacement of the platen relative to the print wheel. Manipulation of the impact control lever causes the impact force to be varied.

The relative positions of hammer 1 print wheel 2, and platen 3 are shown in Fig. 1. In operation, a magnet 4 acts upon armature 5 which strikes hammer 1. Hammer 1 is accelerated through distance D1 and is allowed to free flight through distance El. Hammer return spring 6 slightly decelerates hammer 1. When a flexible pedal on print wheel 2 is contacted, the pedal and spring 6 both act to further decelerate hammer 1.

After the pedal is contacted, it is driven through distance F1 toward platen 3. If the copy control lever is manipulated to cause platen 3 to be displaced to the right a distance MC1, a paper and carbon stack having a thickness MC can be accommodated. Thereafter, if an attempt is made to print on only one sheet, the energy of hammer 1 at platen 3 will be less than desirable.

On the other hand, if a paper stack thickness MC were present, the capability to print and produce carbon copies would be diminishe...