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Browse Prior Art Database

Ribbon Release to Prevent Breakage

IP.com Disclosure Number: IPCOM000044892D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Applegate, SL: AUTHOR [+3]

Abstract

In certain thermal printing applications the ribbon feed path is changed to one in which the ribbon follows the paper for a time before the path leads away from the paper. This permits cooling of the printing before the ribbon is pulled away. When a guide pad is moved toward the platen to provide the cooling path, the ribbon is stretched between the printhead and the take-up mechanism and can be broken. In the mechanism described here, a cam system moves the head away from the ribbon while the guide pad is moved to the platen.

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Ribbon Release to Prevent Breakage

In certain thermal printing applications the ribbon feed path is changed to one in which the ribbon follows the paper for a time before the path leads away from the paper. This permits cooling of the printing before the ribbon is pulled away. When a guide pad is moved toward the platen to provide the cooling path, the ribbon is stretched between the printhead and the take-up mechanism and can be broken. In the mechanism described here, a cam system moves the head away from the ribbon while the guide pad is moved to the platen.

Fig. 1 shows illustratively a thermal printing system during standard use. A thermal ribbon is held in contact with the platen by a printhead, positioned by a pivoted carrier arm. Feed rolls firmly hold the ribbon. The guide pad is located away from the platen and out of the path of the ribbon.

Fig. 2 shows the same printer after the guide pad is brought forward to hold the ribbon parallel to the platen for a period after passing the printhead. The new path is longer than the prior path, and the feed rollers and head to platen are pinch points. Fig. 3 shows the mechanism employed to prevent stretching between those points and possible breakage.

Actuating pin 1 on control surface 3 contacts cam surface 5 on the printhead carrier 7. Arm 9 having follower 11 is linked directly to the guide pad. Follower 11 rides in track 13 on surface 3. Fig. 3 shows the system just before pin 1 contacts surface 5 to move the...