JPS5869646A - Paper feeding equipment - Google Patents

Abstract

PURPOSE:To reliably feed the sheets in such a way that in a paper feeding equipment of a duplicator, etc., upturned flexure of cut sheets which have been loaded on the sheet loading plate is restricted by an upper limit restricting member. CONSTITUTION:Sheets 21 of paper are fed under a constant contact pressure in such a way that the paper feeding side of a sheet loading plate 47 is pushed up by a spring 48, the cut sheets 21 on the loading plate 47 are brought into contact with a paper feed roller 22 under steadily uniform pressing force, and the corner parts of the paper feeding side at the upper faces of the sheets 21 is brought into contact with sheet separating pawls 491, 492 with the self weight. In this occasion though the sheets on the sheet loading plate 47 are going to bend upward at the rear part of the pressure contact point of the paper feed roller 22, flexure of the sheets is restricted by a flexure upper limit restricting member 67<1>, so that feed of the sheets 22 of the paper can be reliably done because the paper feeding side of the sheet loading plate 47 is inclined forward.

Description

[Detailed description of the invention] In electrophotographic copying machines or other copying machines, or simple printing machines, cut sheets (transfer paper, photosensitive paper,
To simplify the installation or conversion of printing paper cylinders (hereinafter referred to as sheets) to this machine.

A so-called cassette method is adopted in which several sheets of different sizes and paper quality are stored in cassette A separately in advance, and those cassettes are selectively loaded into cassette receiver B on the machine side for paper feeding. .

The present invention relates to an improvement of the above-mentioned paper feeding device. In particular, the sheet mounting plate is moved up by a tilting fulcrum on the side opposite to the paper feeding side, and the paper feeding side is pushed up by a spring to move the sheet on the mounting plate to the paper feeding roller. Always make contact with a uniform pressing force.

In a cassette of the type in which the sheet separating claw contacts the corner of the top surface of the sheet on the paper feeding side by its own weight, the upper limit of the curvature of the cut sheets stacked on the cut sheet stacking plate (curving upward) is The purpose is to improve the reliability of sheet feeding.

To explain an example of the above type (1) cassette with reference to the diagram, 20 is the main body box of the cassette, and 72□ and 72° are fixed in the box at intervals that approximately correspond to the width of the sheets to be stored. The purpose of the side plates (side guides) is to open the doors on both sides of the storage seat. 47 is its side plate 72□・72
With a sheet mounting plate provided between 2 and 2, the paper feeding side is supported in a upward direction by springs 48 with the opposite side to the paper feeding side as a tilting fulcrum a, and the sheet 21 is placed and stored on this mounting plate 47. do. In this case, when a full load of sheets is loaded, the sheet feeding side of the loading plate 47 is supported substantially horizontally by the loading plate 47 against the spring 48 (FIG. 2). 49□ and 49° are support arms 49 respectively
A sheet separating claw supported vertically and freely around the shafts 68 and 68 through 49 degrees holds the tip corner of the sheet 21 placed on the mounting plate 47 with its own weight and separates the sheet. It serves to separate each piece. Reference numeral 70 denotes a side presser that presses the side surface of the storage sheet 21, which is projected inward by a spring 71 and presses against the side surface of the sheet a cushioning material 690 such as foamed Norasnak provided on its inner surface. This side presser 70 is provided for the purpose of ensuring that each sheet is separated. 47 □ is provided on the mounting plate 47 to prevent the sheet from sliding down 67 indicates the lid of the cassette.

Then, load the cassette (7) A containing the above sheet into the cassette holder B of this machine (not shown) along the guides 57□ and 57□ of the cassette B, and place the sheet side inside the cassette against the cassette holder B of this machine By bringing the paper feed roller 22 on the side into contact with the paper feed roller 22 with some force depending on the paper feed number &', the sheets are fed out one by one to the machine side. In this case, the paper feed side of the sheet loading plate 47 is gradually pushed up by the spring 48, and the top of the paper feed side of the sheet is at the same height as when the sheet is fully loaded, regardless of the current storage amount of sheets. The constant of the spring 48 is designed such that the constant of the spring 48 is maintained. C is a cassette loading guide and locking mechanism provided relatively to the cassette A and the cassette holder B on the machine side.

For the above type of cassette, when fully loaded with sheets (Figure 2)
In this case, the sheet loading plate 47 is held substantially horizontally, and the first paper feed roller 22 and the sheet separating claws 49° and 49° are placed in contact with the substantially horizontal sheet surface, but the consumption of the sheet is reduced. During the reduction process, as described above, the sheet loading plate 47 is lifted by the spring 48 on the sheet feeding side and tilted, so that the sheet surface is also tilted, and therefore the sheet is bent against the sheet feeding roller 22X' and separation claws 491 and 49□. It causes a rift in the relationship. Specifically, as shown in the fourth figure, as the sheet surface inclines, the point of contact of the frost paper row 222 with the sheet surface changes to h when the sheet is fully loaded.
The paper feed roller 22 hits the sheet lightly due to the difference (hh), which causes variations in sheet feeding. In addition, the separation claws 491 and 492 make point contact with the sheet, and if the engagement between the two is shallow, the sheet cannot be held down properly, which becomes a factor that impairs the reliability of sheet feeding.

Regarding this point, the cassette of this example maintains the upper surface of the sheet feeding side almost horizontally throughout the entire process from when the sheet is fully loaded to when the sheet is used up, regardless of the inclination of the sheet loading plate. The above problem is solved by always facing the paper roller and the sheet separating claw. That is, the paper feeding side of the sheet loading plate 47.

It is inclined forward with a bending point closer to the support plate tilting fulcrum a than the point of contact between the paper feed roller 22 and the sheet 21 (FIGS. 2 and 6).

In other words, the paper feeding side of the sheet mounting plate 47 is folded so that the front side is bent (
For example, by setting 2 to 10), even if the sheet mounting plate 47 is tilted as the consumption of the sheets 21 decreases, the sheet surface on the paper feeding side can be bent along the forward slope by using the forward facing surface. The sheet surface is made to contact the paper feed roller 22 and the separation claw 49□Φ492 in a substantially horizontal state, so that the sheet 21, the paper feed roller 22, and the separation claw are separated when the sheet is fully loaded and when sheet consumption is reduced. 49□, 2 The contact condition between the three is changed to -f, and the reliability of sheet feeding is improved.

In this case, when the sheet is fully loaded, the first layer on the paper feed side T of the sheet bends along the forward-sloping surface of the sheet mounting plate 47, but as it moves toward the upper layer, the self-sprouting cherry blossoms of the sheet bundle bend. As a result, the upper surface of the sheet maintains a substantially horizontal surface.

In addition, in the process of decreasing sheet consumption, the horizontal holding force due to the waist of the sheet bundle weakens, but as the sheet feeding side of the loading plate is lifted up and the forward facing surface approaches horizontal, the upper surface of the sheet feeding side of the sheet is maintained approximately horizontal. When the stiffness of the sheet bundle has completely weakened, that is, when most of the sheets have been consumed, the forward facing surface of the loading plate becomes approximately horizontal, so that the upper surface of the sheet on the feeding side becomes approximately horizontal.

By the way, in the above-mentioned cassette, by tilting the sheet feeding side of the sheet loading plate forward, the sheets on the loading plate tend to curve upward at the rear of the pressure contact point of the sheet feeding roller, which causes the paper feeding side to tilt forward. adversely affect the certainty of Therefore, the present invention is characterized by providing a member 6/ for regulating the upper limit of the curvature. In the illustrated example, the regulating member 67 is formed by bending the tip of the lid 67 of the cassette downward.

In other words, if the sheet is curved, the distance from when the paper feed roller 22 descends to contact with the sheet during paper feeding varies, and the point at which the sheet starts to be fed varies.

As a result, the sheets fed out from the cassette vary and the action of the register rollers (not shown) provided on the machine cannot be fully utilized, resulting in poor registration. In this regard, in the present invention, the above-mentioned problem does not occur because the above-mentioned member 67 is provided to regulate the upper limit of curvature of the seal l.

[Brief explanation of drawings]

Figure 1 is a partially cutaway plan view of the cassette loaded into the cassette holder on the machine side, Figures 2 and 3 are cross-sectional side views of the fully loaded state and the state of reduced consumption, respectively, and Figure 4 is the main part of the conventional cassette. Cross-sectional side view. 20 is a cassette body box, 721 and 72 degrees are side plates, 47 is a sheet loading plate with the paper feeding side bent at a front angle of 9, and 48 is holding the paper feeding side of the sheet loading plate. Lifting springs 491 and 492 are sheet separation claws that press the corner of the tip of the stored sheet with their own weight; 70 is a side presser that presses the side surface of the stored cut sheet 21 with a spring 71;
69 is the cushioning material attached to the inner surface of the side presser, 6
7 is the sb upper limit regulating member of the seat, and B is the cassette holder on the machine side. C is a cassette loading guide and locking mechanism provided relatively to A and cassette holder B.

Claims (1)

[Claims] (1) A cut sheet stacking plate that stacks cut sheets and can swing freely using the non-sheet feeding side as a tilting fulcrum. A paper feeding means for feeding the cut sheets stacked on the cough cut sheet stacking plate. means for pushing up the paper feeding side of the cut sheet stacking plate in the direction of the paper feeding means; 1) A sheet feeding device f0 having a member for regulating the upper limit of the upward curvature of the cut sheets stacked on the cut sheet stacking plate;