Browse Prior Art Database

Method to Obtain Slack Ribbon Linkage in IBM Quietwriter Printer

IP.com Disclosure Number: IPCOM000038974D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 3 page(s) / 70K

Publishing Venue

IBM

Related People

Rachui, RA: AUTHOR [+2]

Abstract

A method of achieving a slack ribbon condition when the print head hits the platen in an IBM QUIETWRITER* printer is described. The printer has a ribbon pinch brake/shock arm mechanism on the carrier, as shown in Fig. 1, to assure that the ribbon 7 is taut as it passes across the secondary ground shoe at the print head 3. This taut ribbon condition is necessary to obtain an adequate electrical ground path from the ribbon during printing. However, the pinch brake/shock arm mechanism can be manipulated by the existing clutch actuation solenoid 8 to generate slack in the ribbon at the time the head is brought into contact with the platen. This can be done by adding two levers and a link to the solenoid bracket assembly.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 57% of the total text.

Page 1 of 3

Method to Obtain Slack Ribbon Linkage in IBM Quietwriter Printer

A method of achieving a slack ribbon condition when the print head hits the platen in an IBM QUIETWRITER* printer is described. The printer has a ribbon pinch brake/shock arm mechanism on the carrier, as shown in Fig. 1, to assure that the ribbon 7 is taut as it passes across the secondary ground shoe at the print head 3. This taut ribbon condition is necessary to obtain an adequate electrical ground path from the ribbon during printing. However, the pinch brake/shock arm mechanism can be manipulated by the existing clutch actuation solenoid 8 to generate slack in the ribbon at the time the head is brought into contact with the platen. This can be done by adding two levers and a link to the solenoid bracket assembly. The first lever 13 manipulates the spring-loaded shock arm 5, while the second lever 11 manipulates the ribbon pinch brake 4. A link 10 connects these two levers to the solenoid bellcrank 1, synchronizing brake assembly manipulation to head actuation. The sequence of events involved in creating ribbon slack at the print head with this arrangement is as follows: 1. The sequence begins with the carrier escaping from

left to right, solenoid picked, print head against

the platen, ribbon drive clutch engaged, and

ribbon passing across the head under the tension

imposed by the pinch brake.

2. At the end of a line of print (or prior to

tabbing), the hold current to the solenoid is

turned off and the spring 9 forces on the solenoid

bellcrank 1 force it to rotate to its "rest"

position against the upstop.

3. This rotary motion is transferred to the two brake

assembly manipulation levers 13 and 11 by the

connecting link 10. The brake manip...