JPH0781789A - Paper feeding device - Google Patents

Abstract

PURPOSE:To perform the feed of paper sheets for a plurality of paper cassette by means of a pick roller and a paper guide, to reduce the number of parts, to reduce a mounting space, and to reduce the size of a device, by providing a pick roller moving means to move a pick desired paper cassette, and an roller and the like to a expandable and rotatable paper guide. CONSTITUTION:When the feed of papers from a paper cassette 4 is varied to that from a paper cassette 1, a pinion 8 is rotated and a pick roller 10 and a paper introduction port 11b are moved in the direction of an arrow mark A, the pick roller 10 is separated away arrow mark B through rotation of a pinion 6, a pick roller 10 is 10 and the paper introduction inlet 11b in the direction of an arrow mark B through rotation of a pinion 6, a pick roller 10 is positioned to a position above the opening part 1a of the paper cassette 1. Finally, by moving a rack 9' in the direction of an arrow mark C through rotation of a pinion 8', a pick roller 10' is brought into the paper sheet 5 of the opening part 1a. Thereafter, the paper sheet 5 is fed in paper guides 11' and 12' by means of the pick roller 10'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device used in a cut sheet printer or the like, and more particularly to a sheet feeding device suitable for downsizing.

[0002]

2. Description of the Related Art In a conventional paper feeding device, B5, A4
A plurality of paper cassettes are prepared according to paper sizes such as. Each of these paper cassettes is provided with a pick roller that comes into contact with the paper in the paper cassette and rotates to take out the paper, and a paper guide that guides the paper taken out by the pick roller to the printer body or the like. ing. The number of paper cassettes tends to increase more and more as the printers and other functions become more sophisticated in recent years.

[0003]

However, in such a conventional paper feeder, a pick roller and a paper guide are required for each paper cassette. Therefore, the number of paper cassettes increases, the number of parts such as pick rollers and paper guides increases, and the size of the apparatus increases.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a paper feeding device which can be downsized even if the number of paper cassettes is large.

[0005]

The sheet feeding device according to the present invention has been made to achieve the above-mentioned object, and accommodates a large number of sheets inside and places these sheets on one end side of the upper surface. The sheet cassette comprises a plurality of sheet cassettes each having an opening for taking out, and the sheet cassettes of a plurality of sizes are opened by placing the sheet cassettes of a small size on the upper surface of the sheet cassette of a larger size other than the opening portion. A stack of sheet cassettes which are sequentially stacked with their parts aligned with the one end side; a pick roller that picks up the sheet by abutting and rotating the sheet from the opening of the sheet cassette; and a pick roller It has an expandable flat cylindrical shape having a sheet inlet port fixed to the sheet and a sheet outlet port pivotally supported at a fixed position and is taken out by the pick roller. A paper guide that introduces paper from the paper introduction port and discharges the paper to the outside from the paper ejection port, and the pick roller and the paper introduction port from the opening of one paper cassette to the opening of another paper cassette. And a pick roller moving means for moving to.

[0006]

The sheet is taken out from the opening of the sheet cassette by the pick roller, and sent from the sheet introduction port of the sheet guide to the printer body through the sheet discharge port. When another paper cassette is used, the pick roller moving means moves the pick roller and the paper inlet to the opening of the other paper cassette. Along with this movement, the paper guide expands and contracts and rotates around the paper discharge port. Therefore, the paper taken out by the pick roller is
It is sent to the printer body, etc. through the paper introduction port of the paper guide without any trouble.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway side view showing an embodiment of the present invention. Hereinafter, description will be given based on this figure.

The sheet feeding device according to the present invention accommodates a large number of sheets 5 therein and has a plurality of sheet cassettes 1 having openings 1a, 2a, 3a, 4a for taking out the sheets 5 at one end side of the upper surface. , 2, 3, 4, and a plurality of size paper cassettes 1, 2, 3, 4 are opened by placing a small size paper cassette 3 on the upper surface other than the opening 4a of the large size paper cassette 4. Parts 1a, 2a, 3a,
Paper cassette laminated body 20 in which 4a is aligned on one end side and laminated in order, and openings 1 of the paper cassettes 1, 2, 3 and 4
a pick roller 10 that takes out the paper 5 by abutting and rotating the paper 5 from a, 2a, 3a, 4a, a paper introduction port 11b fixed to the pick roller 10, and a paper ejection port 12c pivotally supported at a fixed position. The sheet 5 having the shape of a flexible flat tube having the following is introduced from the sheet introduction port 11b to the sheet ejection port 12 which is taken out by the pick roller 10.
The paper guides 11 and 12 discharged from c to the outside, the pick roller 10 and the paper introduction port 11b from the openings 1a, 2a, 3a, 4a of one paper cassette 1, 2, 3, 4 to the other paper cassette 1, 2, 3 and 4 openings 1a, 2a and 3
a, 4a, pick roller moving means 6, 7,
8 and 9 are provided.

Further, the pick roller moving means has a linear shape extending in a substantially vertical direction, and the pick roller 1 is provided at the lower end.
A rack 9 equipped with 0, a pinion 8 for moving the rack 9 in a substantially vertical direction, a rack 7 having a linear shape substantially orthogonal to the rack 9 and supporting the rack 9 and the pinion 8, and a rack 7. It is composed of a pinion 6 that moves in a substantially horizontal direction.

The paper guides 11 and 12 have a double cylindrical shape so that they can be slidably extended and can rotate about a fulcrum 13.

When the pinion 8 rotates, the pick roller 1
0 moves in the direction of arrow A along with the rack 9. Pinion 6
When the rack rotates, the rack 7 moves in the direction of arrow B along the small rollers 7e, 7f, 7g, and 7h.
The pinion 8 also moves in the direction of arrow B.

That is, in the figure, the only parts whose positions do not change are the pinion 6, the small rollers 7e, ..., The fulcrum 13 and the sheet cassette stack 20.

Next, the case of changing the paper supply from the paper cassette 4 to the paper cassette 1 will be described.

First, the pinion 8 is rotated to move the pick roller 10 and the sheet introduction port 11b in the direction of arrow A. The pick roller 10 separates from the opening 4a. Then, by rotating the pinion 6 to move the pick roller 10 and the sheet introduction port 11b in the direction of arrow B,
The pick roller 10 is positioned above the opening 1a of the paper cassette 1. Here, the pinion 8, the rack 9, the pick roller 10, and the paper guides 11 and 12 after the movement are shown by the pinion 8 ′, the rack 9 ′, the pick roller 10 ′, and the paper guides 11 ′ and 12 ′. Finally, the pinion 8'is rotated to move the rack 9'in the direction of arrow C to bring the pick roller 10 'into contact with the sheet 5 in the opening 1a.

Thereafter, the pick roller 10 'sends the sheet 5 into the sheet guides 11' and 12 ', and the sheet 5 is viewed in the direction of arrow D.
Sent in the direction.

[0016]

As described above, according to the present invention,
Feeding sheets of a plurality of sheet cassettes with one pick roller and a sheet guide by providing a pick roller moving means for moving the pick roller and the like to a desired sheet cassette, a retractable and extendable sheet guide, and the like. You can
Therefore, it is possible to reduce the number of components and the mounting space for these components, and to achieve miniaturization.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention.

[Explanation of symbols]

 1, 2, 3, 4 Paper cassette 1a, 2a, 3a, 4a Opening of paper cassette 5 Paper 6 Second pinion (pick roller moving means) 7 Second rack (pick roller moving means) 8, 8 ' 1 pinion (pick roller moving means) 9,9 'first rack (pick roller moving means) 10,10' pick roller 11, 11 ', 12, 12' paper guide 11b paper guide paper introduction port 12c paper guide Paper discharge port 20 Paper cassette stack

Claims (2)

[Claims] 1. A plurality of paper cassettes that accommodate a large number of paper sheets inside and have openings for taking out these paper sheets at one end side of the upper surface, and the paper cassettes other than the openings of the large-sized paper cassette. A paper cassette laminated body in which a plurality of paper cassettes of a plurality of sizes are stacked in order by placing the paper cassettes of a small size on the upper surface with the openings aligned with the one end side, and the paper cassettes described above. An extendable flat cylinder having a pick roller for taking out the sheet by abutting against the sheet through the opening and rotating the sheet, a sheet introducing port fixed to the pick roller, and a sheet discharging port pivotally supported at a fixed position. A paper guide that has a shape and that introduces the paper taken out by the pick roller from the paper introduction port and discharges the paper to the outside from the paper ejection port; A sheet feeding device, comprising: a crawler and a pick roller moving unit that moves the sheet introducing port from the opening of one sheet cassette to the opening of another sheet cassette. 2. The pick roller moving means has a first rack having a linear shape extending in a substantially vertical direction and having the lower end equipped with the pick roller, and the first rack is moved in a substantially vertical direction. A first pinion, a second rack having a linear shape substantially orthogonal to the first rack and supporting the first rack and the first pinion, and the second rack being substantially horizontal The sheet feeding device according to claim 1, wherein the sheet feeding device comprises a second pinion that moves in a direction.