Browse Prior Art Database

Paper Separator and Feed Mechanism

IP.com Disclosure Number: IPCOM000040423D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 3 page(s) / 40K

Publishing Venue

IBM

Related People

Hunt, RE: AUTHOR [+2]

Abstract

A more reliable, low cost paper feed that feeds all widths of paper and requires no paper elevator, is shown in Figs. 1-5. The paper feed apparatus comprises a cone feed roller, a single corner-buckler and a cam wherein the roller is lowered onto the paper stack for feeding and lifted at cycle home by a cam resting on the corner-buckler. A corner-buckler is employed with no external spring force, cam loaded against the paper at home to retain the stack, released to float while feeding so the top sheet can be buckled out, and loaded again at (Image Omitted) cycle end to move the buckler down one sheet. The feed mechanism operates only on the front left corner of the paper so any length and width of paper can be fed. Also, the feed mechanism seeks the level of the stack so no stack elevator means is required. Fig.

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Paper Separator and Feed Mechanism

A more reliable, low cost paper feed that feeds all widths of paper and requires no paper elevator, is shown in Figs. 1-5. The paper feed apparatus comprises a cone feed roller, a single corner-buckler and a cam wherein the roller is lowered onto the paper stack for feeding and lifted at cycle home by a cam resting on the corner-buckler. A corner-buckler is employed with no external spring force, cam loaded against the paper at home to retain the stack, released to float while feeding so the top sheet can be buckled out, and loaded again at

(Image Omitted)

cycle end to move the buckler down one sheet. The feed mechanism operates only on the front left corner of the paper so any length and width of paper can be fed. Also, the feed mechanism seeks the level of the stack so no stack elevator means is required. Fig. 1 shows the separator mechanism which includes the high friction cone roller 1 and a pinion gear 2, both fixedly attached to drive shaft
3. Shaft 3 freely rotates in a floating pivoted frame member 4 and is driven by gear 5. Gear 6 freely rotates on pin 7 in member 4 and is in mesh with gear 2. Fixedly attached to the side of gear 6 is cam lobe 8.

(Image Omitted)

In its home position, shown in Fig. 2, cone roller 1 is held slightly above paper stack 9 by cam lobe 8 which is resting on tab extension 10 of corner buckler 11. When a feed cycle is initiated, drive shaft 3 is rotated clockwise, as viewed in Fig.
1. Cam lobe 8 is rotated off tab 10, and roller 1 is lowered onto paper stack 9 with corner buckler 11 floating on the top sheet 12. A 2-to-1 gear ratio exists between the roller 1 and cam 8 so the paper 12 can be fed almost two times the roller circumference to a printer or the like before cam lobe 8 lifts the roller 1. Sheet 12 is then free to be moved by the printer. The paper feed apparatus, shown in Fig. 3, consists of a gear segment clutch, a connecting gear train, and a high friction cone roller, all mounted on a pivoting frame member. In Fig. 3, the upper paper feed arm module is generally designated by reference numerals 31. Upper arm module 31 includes a clutch and drive for an upper paper stack and another one for feeding an envelope stack. The lower arm module (not shown) also has two clutches: one for a lower paper stack and another to actuate the printer paper bail. Module 31 pivots on pin 33 which is fixedly attached to printer side frame 34. Paper feed clutch 35, as shown in Figs. 3 and 4, is free to rotate on pin 33. Drive gear 39 is fixedly attached to pivot pin 33 to provide continuous drive to cone transport roller clutch 35, which is a one-piece molded part consisting of a latch surface 36, a home detent cam 37, a segment gear 38, with four missing gear teeth and a drive gear 39. Clutch 35 is held latched in home position by a torsion spring 40 acting on cam 37 and latch arm 41 acting on latch surfa...