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Browse Prior Art Database

Typewriter Paper Feed System

IP.com Disclosure Number: IPCOM000045586D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 46K

Publishing Venue

IBM

Related People

Caron, CD: AUTHOR [+2]

Abstract

This article describes a paper feed system which utilizes a fixed gate with independently controlled front and back pinch rollers for loading paper into a printing device, such as a typewriter. The system can either be operated manually or automatically.

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Typewriter Paper Feed System

This article describes a paper feed system which utilizes a fixed gate with independently controlled front and back pinch rollers for loading paper into a printing device, such as a typewriter. The system can either be operated manually or automatically.

Fig. 1 shows the paper feed system with each element of the system identified. Fig. 2 shows the paper feed system in its normal position. The control lever is spring-loaded (not shown) so that the system will return to this position except when it is manually held in another position or if a detent is used in the lever back position.

To load the typewriter, sheet 10 is dropped into the preload position behind the platen and onto the fixed gate. The weight of the sheet causes it to align itself to the gate. The control lever is then pulled forward, causing the rear rollers to move the paper out of the gate and pinches it against the platen (Fig. 2) . The forward movement of the control lever is continued past this point until a stop (not shown) is reached. The rear roller actuator is designed with a spring arm (not shown) to allow this over-travel. The bail is driven away from the platen by the control lever via a linkage. Fig. 2 shows the system in this configuration. An electrical switch or contact (not shown) is made as the lever is pulled into its stop. This switch enables the index drive (not shown) to rotate the platen and thereby drive the paper to its initial print position. This completes the loading sequence. Upon release, the lever returns to its home position shown in Fig. 1.

The system is also designed to allow the repositioning of the paper on the platen after loading. The repositioning concept is shown in Fig. 3. This is accomplished by moving the control lever to the back of normal position. The back position of the control lever releases the front rollers and the bail so that the paper is easily re-located. The rear rollers are not in contact in the normal position, and the backward motion of the lever does not affect them. Release of the control lever allows the system to return to the normal position. In the normal position the paper is gripped with the front rollers and bail. In most cases, it would be desirable to detent the lever in the backward position, requiring the lever to be pulled back to the normal position. This allows the u...