JPH02270736A - Sheet feeder - Google Patents

Abstract

PURPOSE:To take out a sheet one by one without damaging the surface of the sheet by providing a contacting member obliquely brought into contact with the sheet lifted by a sucking means. CONSTITUTION:The uppermost sheet 38 sucked by a sucking means 101 is lifted in this state. The end section of the sheet 38 is brought into contact with a contacting member (plate spring) 50 and curved. The second and following sheets 38 stuck to the uppermost sheet 38 are separated. The sheet 38 can be taken out from a cartridge case 13 one by one without damaging the surface of the sheet 38.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a sheet feeding device that separates and feeds the uppermost sheet one by one from a stacked sheet bundle.

[Prior Art] Conventionally, as a sheet feeding device used in a copying machine or the like, one using a snapper parallel to the sheet is known. In such a device, when the topmost sheet of the sheet bundle is lifted, the end of the sheet is caught by the snapper and bent.

Therefore, the second and subsequent sheets that are attracted and lifted by the electrostatic force are separated by their own strain strength.

[Problems to be Solved by the Invention] However, in the sheet feeding device using the above-mentioned snapper, scratches tend to occur at the locking position of the snapper, and especially with special sheets such as color developer paper used in combination with photosensitive and pressure-sensitive paper, the surface Components such as color developer applied to the surface will peel off, causing problems in processing such as image formation.

The present invention has been made to solve the above problems,
The purpose is to provide a sheet feeding device that can take out sheets one by one without damaging the sheet surface.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a suction means for suctioning and lifting the topmost sheet of stacked sheets, and a suction means for suctioning and lifting the topmost sheet of stacked sheets, and a suction means for the sheet lifted by the suction means. and an abutting member that abuts diagonally.

[Operation 1] In the apparatus having the above configuration, the two most parts of the sheet that have been adsorbed by the adsorption means are lifted in that state. At this time, the sheet end comes into contact with the abutting member and curves. Therefore, the second and subsequent sheets attached to the top are separated.

[Example] Hereinafter, in order to explain the present invention more specifically, an example will be given and explained.

FIG. 2 is a schematic sectional view of a photosensitive and pressure sensitive copying machine that is capable of full color copying. Incidentally, a photosensitive paper (consisting of microcapsule paper and color developer paper) that enables such copying has been proposed in Japanese Patent Application Laid-Open No. 58-88739, etc., and will not be described in detail here.

As shown in the figure, in the photosensitive and pressure sensitive copying machine 40, a desired original is placed face down on the opening of the original platen glass 2 and the original platen cover 1, the top plate of which is movable in the horizontal direction. At the same time, a halogen lamp 3 extending in a direction perpendicular to the moving direction of the document platen glass 2 is turned on, and the light is reflected onto a reflecting mirror 4.
and 5, the light is irradiated onto the document surface on the document table glass 2 in a line shape.

The reflected light from the original passes through a filter 8 and is irradiated via a lens 9 and a reflection mirror 11 onto the surface of a microcapsule paper 37 that is transferred in a fixed direction above one exposure table. The filter 8 is used to change the light transmission characteristics according to the sensitivity characteristics of the microcapsule paper 37 and adjust the color tone of the copied image.

The lens 9 is attached to a lens mounting plate 10, and allows minute angle adjustment with respect to the optical path.

On the other hand, the microcapsule paper 37 is in the form of a roll paper, and is housed in the cartridge case 13 in a state where it is supported by a shaft 14, and one end of the microcapsule paper 37 is attached to the cartridge case 13.
is pulled out from the feed roller 15,7y idle roller 17
is guided to one of the exposure tables, further passes through a pressure developing device 20, and then passes through a peeling roller 23 and a meandering adjustment roller 2.
4 and then wound onto a winding shaft 25. It should be noted that the unexposed microcapsule paper 37 after leaving the cartridge 177 is maintained in an unexposed state by the light shielding cover 16. In addition, microcapsule paper 37
The conveyance speed of the microcapsule paper 37 is controlled to be constant by the capsule paper feed roller 22, and the movement speed of the document table glass 2 is made to match by 1. Lines of latent images are sequentially formed.

A developer paper cassette 32 containing developer paper 38 as a cut paper type image recording sheet is provided below the pressure developing device 20, and the developer paper 38 is attached to a suction cup 101.
The sheets are taken out one by one, conveyed by the developer paper roller 33, and after the leading end is aligned by the developer paper roller 34 and the renost gate 35, the paper is fed into the paper inlet of the pressure developing device 20. Therefore, the latent image forming surface of the microcapsule paper 37 and the color developer coated surface of the color developer paper 38 are sandwiched between the small diameter roller 21 and the backup roller 31 of the pressure developing device 20 in a state in which they are in close contact with each other, and this pressure causes the unexposed Color developing paper 3 is created by destroying the microcapsules.
An image is formed on 8.

The microcapsule paper 37 and color developer paper 38 that have come out of the pressure developing device are conveyed by a capsule paper feed roller 22, separated by a peeling roller 23, and then the color developer paper 38 is sent to a heat fixing device to promote color development. After that, the paper is carried out to F-ray 27. The heat fixing device is composed of a hollow heat roller 29 having a heater 30 inside and a color developing paper feed roller 28.

Next, the structure of the color developing paper cassette 32 mentioned above will be explained with reference to FIG. fIS1 and FIG.

A sheet of polyethylene terephthalate (P, ET) is pasted on the inner surface of the outer frame 201 of the main color developer paper cassette 32 on the side that is attached to the main body of the photosensitive and pressure sensitive copying machine, and A nylon net 202 with a coefficient of friction is attached.

A leaf spring 50 is attached to the upper part of this side surface so as to be bent inward. This leaf spring 50 corresponds to the abutting member and is adjusted at an angle of 45° with respect to the side surface. A closed-cell foamed polyethylene sheet 203 is pasted on the left side of this surface. A mounting table 204 is provided on the bottom surface of the developer cassette 32 on which the developer paper 38 is placed. This mounting table 204 is attached by screws 221 so as to be movable in the directions of arrows A and B shown in the figure. A presser plate 205 is attached perpendicularly to the mounting table 204 on the right side of the mounting table 204 with respect to the net 202 . This presser plate 2
05 has a closed cell foam polyethylene sheet 20 inside.
6 is pasted on it.

Further, a knob 207 is attached to the outside of this presser plate 205. This knob 207 passes through a hole 208 provided in the outer frame 201 and projects outside the outer frame 201. By moving this knob 207, the user can move the holding plate 205 and the mounting table 204 in the directions of arrows A and B in the figure. This knob 207 is provided with a 60° notch 209 on the right side in the figure. Further, cams 210 and 211 protrude from the left side of the mounting table 204 in the drawing.

A presser plate 212 is provided on the left side of the mounting table 204 in the figure, and is movable in the directions of arrows C and D in the figure. A closed-cell foamed polyethylene sheet 213 is pasted on the inside of this presser plate 212. This presser plate 21
Holes 214 and 215 are provided in the cam 21.
0.211 is passing through. This hole 21.4.215
At the bottom right of the cam 7 rollers 7216 and 217 extending vertically from the base of the presser plate 212 are installed, and the force A210 is
It is in contact with ゜211. As shown in FIG. 3, this holding plate is biased in the direction of arrow C in the figure by a spring 220 provided under the mounting table 204. Therefore, the presser plate 212 is attached to the cam 7 roller 721.
6.217 constantly moves to the position where it contacts the cam surface.

In other words, when the mounting table 204 and the holding plate 205 move in the direction of arrow A in the figure by operating the knob 207,
The presser plate 212 moves in the direction of arrow C in the figure. Further, when the mounting table 204 and the holding plate 205 move in the direction of arrow B in the figure, the holding plate 212 moves in the direction of the arrow.

When the knob 207 is pushed in, the width of the space surrounded by the closed-cell foam sheets 203, 206, 213 and the net 202 is the same as the paper size.

The color developing paper cassette 32 configured in this way has a knob 2.
07 is pulled toward you, the developer paper 38 is placed facing downward on the mounting table 204.

In this state, the presser plates 205 and 212 have moved outward, so the user can easily place the color developing paper 38 thereon.

Thereafter, the user pushes in the knob 207 to install the main developing paper cassette 32 into the main body. When the knob 207 is pushed in, the presser plates 205 and 212 move inward as described above, so that the bundles of color developer papers 38 are aligned, and the cut surfaces of each color developer paper 38 are aligned with each closed-cell foamed polyethylene sheet 203, Cover with 206.213 and #8202. Closed-cell foamed polyethylene has high elasticity<ffi and good adhesion, so it has poor air permeability. Further, the network 202 and PET have similar characteristics. Therefore, the developer paper 38 does not absorb moisture from its cut surface. Furthermore, even if the knob 207 is attached to the main body without being pushed in due to the user's carelessness, the cam 7 roller 7218 provided on the main body side comes into contact with the notch 209, and the knob 207 moves along the notch surface. It will be pushed in automatically.

Next, FIG. 4 shows a detailed configuration of a paper feeding device for the color developing paper 38, which is provided with a suction cup 101 corresponding to the suction means. Suction cup 10
1 is an arm 102 suspended by a spring 110;
The arm 102 can be moved in the directions of arrows E and F by a cam 103 against the tension of a spring 110, and in the directions of arrows G and H by a cam 104 against the tension of a spring 111. It can be swayed to. or,
A pressure reducing means 1 is connected to the internal surface of the suction cup 101 through a pipe 105.
It continues in 2006. The pressure reducing means 106 includes the cylinder 10
7. It is composed of a piston 108 and a crank 109, and when the crank 109 rotates, the piston 108 moves in the direction of the arrow 1, and the cam 102, cam 103, and crank 109 can perform each moving body at a predetermined timing. It is mechanically connected like this.

The operation of the paper feeding device constructed in this manner will be explained using FIGS. 4 and 5. First, as the cam 103 rotates, the arm 102 moves in the direction of the arrow E, and comes into contact with the top of the developer paper 38 on which the suction @1o1 is stacked (FIG. 5(a)).

Next, the rotation of the crank 109 causes the piston 108 to move in the direction of the arrow 1, creating a negative pressure inside the shilling 107, and creating a negative pressure between the suction cup 101 and the topmost paper of the color developer paper 38, causing the color developer paper 38 to move into the suction cup 101. It is sucked in (Fig. 5(b)).

Next, the arm 102 is swung in the direction of arrow G by the rotation of the cam 104 while maintaining a negative pressure between the suction cup 101 and the developing paper 38 . At this time, the right side of the developer paper 38 comes into contact with the leaf spring 50, and the uppermost developer paper 38 is bent. Due to this process, even if the second and subsequent sheets are lifted without being separated, a gap is created between each developer paper 38 and separated (the fifth
Figure (C)). Finally, the arm 102 rises in the direction of arrow F due to the rotation of the cam 103, and only the topmost sheet of color developer paper 38 is conveyed to the position of the color developer paper feed roller (Fig. 5(d)
)).

The paper feeding unit performs a series of operations (FIGS. 5(a) to 5(d)) every time a paper feeding signal is received from the main body of the copying machine 40.

The case where a sheet of plain paper coated with a color developer is handled has been described above, but the configuration of the present invention is to handle a color developer paper of a resin sheet used in an overhead V projector that is more susceptible to static electricity than plain paper. It is even more effective when handling This type of color developing paper is stiffer than plain paper, so
Since it is susceptible to the action of contact members such as leaf springs and has poor water absorption, the aforementioned closed-cell foamed polyethylene sheet or the like can be omitted.

Furthermore, a cover 51 as shown in FIG. 6(a) may be attached to prevent the user from inadvertently touching the leaf spring and injuring himself. This cover 51 is rotatable about a shaft 52, and when the color developer paper 38 comes into contact with it, it is lifted as shown in FIG. 6(b), and the color developer paper 38 comes into contact with the leaf spring 50.

[Effect of the Invention 1] As detailed above, according to the present invention, the sheets can be taken out one by one without damaging the sheets. Therefore, even when used to store color developer sheets, etc., there is no fear that the color developer etc. will peel off.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is a perspective view of a developing paper cassette, Figure 2 is a sectional view of the photosensitive pressure-sensitive copying machine, and Figure 3 is a cross-sectional view of the photosensitive pressure-sensitive copying machine. FIG. 4 is a partial top view of the color developer paper cassette, FIG. 4 is a sectional view showing the detailed configuration of the paper feeding device, and FIG.
Figures (,) to (d) are diagrams showing the operation, and Fig. 6 is a diagram showing an example in which a cover is attached to a leaf spring. In the figure, 13 is a cartridge case, 38 is developer paper, 50
is a leaf spring, 51 is a cover, and 101 is a suction cup.

Claims (1)

[Claims] 1. A suction device that suctions and lifts the topmost sheet of the stacked sheets, and an abutment member that abuts diagonally against the sheet lifted by the suction device. A sheet feeding device characterized by: 2. The sheet feeding device according to claim 1, wherein the abutment member is attached to a case for storing the stacked sheets. 3. The sheet feeding device according to claim 1 or 2, wherein the abutting member is a leaf spring. 4. The sheet feeding device according to claim 3, further comprising a cover that covers an end of the leaf spring.