Typewriting machines – Sheet or web – For feeding sheet from stack or pack holder
Patent
1981-08-11
1983-11-22
Wright, Jr., Ernest T.
Typewriting machines
Sheet or web
For feeding sheet from stack or pack holder
4006362, B41J 1310
Patent
active
044165595
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for feeding single sheets from a stack of paper stored in a magazine. The apparatus is capable of being mounted on an office machine.
OBJECT AND SUMMARY OF THE INVENTION
This apparatus is mounted on an office machine, and a drive wheel of the apparatus comes into engagement with the platen of the office machine, preferably by reason of its own weight. The drive of the separate-feed roller, which draws the single sheets from the magazine of the apparatus, is effected via a gear mechanism by means of the drive wheel, and thus by means of the platen. The apparatus accordingly requires no drive motor or control means of its own. The drive and control of the apparatus are accomplished by means of the office machine itself.
The drive wheel and separate-feed roller are interconnected by a gear mechanism designed, in this apparatus, such that the separate-feed roller is driven in the direction in which paper is inserted, if the platen rotates in the direction counter thereto. In order to deliver a single sheet from the magazine to the platen, the platen is rotated in a controlled manner counter to the direction in which the paper is inserted. In so doing, the separate-feed roller pushes the topmost sheet of the stack of paper stored in the magazine toward the entrance slit of the platen, but the paper is not inserted into the slit because the platen is being rotated counter to the direction of paper insertion. The sheet of paper is accordingly forced into a convex shape in front of the entrance slit of the platen, its forward edge assuming a precisely defined position. In order to insert the paper, the platen is then rotated in the paper insertion direction, and the pre-positioned, bulging sheet of paper is thus inserted in a controlled manner based on this precisely defined outset position.
This apparatus enables the pre-positioned sheet to be inserted from a precisely defined outset position, so that the sheet can be precisely positioned in terms of vertical spacing by means of the platen. The apparatus is extremely simple in structure, because it utilizes the drive and control means of the office machine itself, which are already available, and does not require its own drive means or control means.
In order to prevent the separate-feed roller, which engages the topmost sheet of the stack of paper, from hindering the insertion of this sheet by the platen, the magazine is pivotally supported and in engagement with a control cam. The control cam is movable by the drive wheel, via a gear mechanism, in such a way that when the platen is rotated counter to the paper insertion direction, the control cam pivots the magazine into a position in which the stack of paper contacts the separate-feed roller; when the platen is rotated in the paper insertion direction, the control cam pivots the magazine into a position in which the stack of paper is not in contact with the separate-feed roller.
Advantageous forms of embodiment and modifications of the invention are disclosed in the dependent claims.
In the magazine according to the invention, the magazine carrying the stack of paper is pivotally disposed, and it can be pivoted between two positions by means of a control cam. In one of these positions, the stack of paper in the magazine is held in contact with the separate-feed roller, so that this roller can, by frictional engagement, draw off the topmost sheet on the stack; in the other of these two positions, the paper stack in the magazine is pivoted away from the separate-feed roller, so that this roller does not engage the topmost sheet of the stack.
The movement of the control cam and thus the pivoting of the magazine are likewise effected by the platen, and thus by the office machine. This pivoting into and out of position of the magazine is therefore likewise accomplished without a separate drive or control means being required, in a manner which is precisely synchronized with the insertion of the paper. The simplest structure is attained for the ap
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patent: 476727 (1892-06-01), Brower et al.
patent: 881126 (1908-03-01), Hutches, Jr.
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patent: 2242268 (1941-05-01), Sherman
patent: 2366206 (1945-01-01), Metzner
patent: 2887208 (1959-05-01), Cross
IBM Technical Disclosure Bulletin, "Pre-Buckle Forming Back-Up Plate for Supply Cassette", Gunnell, vol. 23, No. 3, Aug. 1980, pp. 947-948.
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