Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Document Feeding Mechanism for Printer

IP.com Disclosure Number: IPCOM000062138D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 3 page(s) / 55K

Publishing Venue

IBM

Related People

Sedgwick, DM: AUTHOR [+2]

Abstract

A mechanism for feeding a continuous web of paper through a printer includes means to ensure that the paper is fed evenly in the forward and reverse directions, that paper feed jams are detected, and that paper can be inserted into the feed mechanism easily. As illustrated in the figure, a paper feed mechanism for feeding a continuous web of paper 1 through a printer includes a pair of tractors 2 formed with pins 3 adapted to engage in holes 4 in the edges of the paper web 1, a first set of rollers 5 mounted on a shaft 6 and a second set of rollers 7 mounted on a shaft 8. A motor 11 is coupled by a belt 12 to a first pulley 13 on a shaft 14 to which are attached the tractors 2, and to a second pulley 15 coupled to the shaft 6 through a one-way clutch 16.

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 52% of the total text.

Page 1 of 3

Document Feeding Mechanism for Printer

A mechanism for feeding a continuous web of paper through a printer includes means to ensure that the paper is fed evenly in the forward and reverse directions, that paper feed jams are detected, and that paper can be inserted into the feed mechanism easily. As illustrated in the figure, a paper feed mechanism for feeding a continuous web of paper 1 through a printer includes a pair of tractors 2 formed with pins 3 adapted to engage in holes 4 in the edges of the paper web 1, a first set of rollers 5 mounted on a shaft 6 and a second set of rollers 7 mounted on a shaft 8. A motor 11 is coupled by a belt 12 to a first pulley 13 on a shaft 14 to which are attached the tractors 2, and to a second pulley 15 coupled to the shaft 6 through a one-way clutch 16. The rollers 5 are all firmly attached to the shaft 6 so that they rotate with the shaft 6, but the rollers 7 are each mounted on a respective bearing 17 on the shaft 8 so that each roller 7 rotates independently of the shaft 8. The rollers 5 and 7 are positioned in pairs and shaft 8 is biased (by a spring not illustrated) toward shaft 6 so that the pairs of rollers tend to make contact and a nip is formed between each pair. On the end of shaft 6 is mounted a plate 21 and a stationary disc 22 is forced against the plate 21 by a spring 23 which can be adjusted by a wheel 24. A spoked wheel 25 is mounted on shaft 8 and is attached to the end one of the rollers 7 so that it rotates with this roller. Two arms 26 are attached to the ends of shaft 8, and cams 27 are attached to the shaft 8 adjacent to the arms 26. The cams 27 abut against fixed pins 29. The printer with which the feed mechanism described above is used includes a print mechanism 31. The paper web 1 extends through the print mechanism 31 and between the pairs of rollers 5 and 7 so that the paper web 1 is clamped in the nip formed between each pair of rollers. The paper web 1 is fed through the print mechanism 31 in the forward direction by the motor 11 driving the tractors 2. The one-way clutch 16 is disengaged so that the shaft 6 rotates freely. The stationary disc 22 is forced against the plate 21 on the shaft 6 by the spring 23 and provides a braking force for the shaft 6. This tends to prevent rotation of the shaft 6 and the rollers 5 and acts t...