Browse Prior Art Database

Ribbon Feed Mechanism

IP.com Disclosure Number: IPCOM000042689D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 3 page(s) / 88K

Publishing Venue

IBM

Related People

Craft, JA: AUTHOR

Abstract

Fig. 1 shows the ribbon feed of a typewriter in which the ribbon 1 is loaded in a cartridge 3 having a lower supply roll 5 and an upper take- up roll 7. Ribbon 1 is pulled out of cartridge 3 by nip rolls 9 and 11, roll 9 being driven while roll 11 is movable away from roll 9 to inhibit feed. Ribbon 1 is guided by pins 13 and 15 on arm 17 of cartridge 3 across printhead 19, shown in Fig. 1 in the printing position proximate to a standard platen 21. Ribbon 1 is directed away from platen 21 by idler roller 23 and is held in tension by tension arm 25, having a roller 27 over which ribbon 1 passes. Arm 25 is biased counterclockwise by spring 28 (Fig. 2). Tension arm 25 maintains a range of ribbon tension force, typically 20 to 40 grams, to contribute to stabilization of the forces acting against printhead 19 during printing.

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Ribbon Feed Mechanism

Fig. 1 shows the ribbon feed of a typewriter in which the ribbon 1 is loaded in a cartridge 3 having a lower supply roll 5 and an upper take- up roll 7. Ribbon 1 is pulled out of cartridge 3 by nip rolls 9 and 11, roll 9 being driven while roll 11 is movable away from roll 9 to inhibit feed. Ribbon 1 is guided by pins 13 and 15 on arm 17 of cartridge 3 across printhead 19, shown in Fig. 1 in the printing position proximate to a standard platen 21. Ribbon 1 is directed away from platen 21 by idler roller 23 and is held in tension by tension arm 25, having a roller 27 over which ribbon 1 passes. Arm 25 is biased counterclockwise by spring 28 (Fig. 2). Tension arm 25 maintains a range of ribbon tension force, typically 20 to 40 grams, to contribute to stabilization of the forces acting against printhead 19 during printing. Brake arm 29, biased clockwise by spring 30 (Fig. 2), presses ribbon 1 against surface 31 on cartridge 3 to act as a drag during take-up. Arm 29 has an abutment 32 which contacts tension arm 25. Take-up spool 7 is driven by a separate motor (not shown) which, for example, is deactivated or has a slip coupling above a predetermined tension of ribbon 1. Lever 33 is shown in Fig. 1 in the position at which cartridge 3 is mounted for printing. It is moved clockwise, as will be discussed in connection with Figs. 2 and 4, when cartridge 3 is to be removed or replaced. Cam 35 is rotated by printer mechanisms (not shown) when a non- printing typewriter function is to be effected. Printhead 19 is moved away from platen 21 by a linkage to cam 35. Cam 35 also engages follower arm 37, biased counterclockwise by spring 39 (Figs. 3 and 4). Brake arm 41, biased clockwise by spring 43, has an abutment 45 (Fig. 4) which engages arm 37 and a braking surface 47, which is rubber. In the clockwise position, surface 47 engages a corresponding surface 49 on cartridge 3. Arm 51, carrying idler roller 11, is biased counterclockwise by spring 53 (Figs. 3 and 4) and has abutment 55 (Fig. 4) which engages follower arm 37. Fig. 4 shows capstan 57, which is connected directly with drive roll 9 by shaft 59. All of the foregoing elements except platen 21 are mounted on a carrier, as is essentially conventional, which moves across the length of platen 21 to effect printing. Cable 61 is mounted across the printer, having a spring 63 (Fig. 1) mounted to frame 65 and directed around guide 67, which is also mounted to the frame. Cable 61 is fixed to the opposite sides of the frame (not shown) so as to be parallel with platen 21. Spring 63 is a strong one employed to provide adjustment in tension with environmenta...