JPS59198230A - Cassette for feeding sheets - Google Patents

Abstract

PURPOSE:To make a paper feed cassette itself in a small size by refraining installation of a pressure means, to heave a sheet receipt table in a paper feed cassette, from location in the lower part of the receipt table, and thereby increasing the capacity for accommodation of the sheets. CONSTITUTION:This cassette 21 for feed of sheets is equipped with a sheet guide 22 at its bottom part to guide the side edges of each sheet having a large thickness such as postal card, a receptacle table 23 with restricting piece 23-1 to admit placing of those thick sheets thereupon and to restrict the trailing edge of the sheets, a restricting pawl 24 to restrict the leading edge of sheets and serve feeding thereof one after another, a sheet position restricting member 25 (25-1, 25-2) to restrict the uppermost position of the sheets placed on said receptacle table 23, a spring retainer 27 to retain a spring 26 for heaving this receptacle table 23 upward at all times, and a stopper 28 to restrict the moving range of said sheet position restricting member 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] KIHASHI 8A relates to a paper feed cassette for automatically feeding paper in a copying machine or the like.

<Prior Art> Generally, in a copying type electrophotographic copying machine, a toner image is formed on a photoconductor through charging, exposure, and development steps.
This toner image is transferred onto a transfer paper using a corona discharge means or the like. Thereafter, the toner image is semi-permanently fixed onto the transfer paper by a fixing device. Usually, the paper used for this transfer paper is about 50 to 250 (17m2)
are in practical use. Approximately 60 to 9 of these
0 (y/rn2) is stored in a 5-sheet feeding cassette or the like because of its high frequency of use and ease of automatic sheet feeding, and is reliably fed by an automatic sheet feeding mechanism.

FIG. 1 is a cross-sectional view showing a state in which a cassette of a normal cassette-type automatic paper feeding mechanism is installed in the main body of a copying machine.

FIG. 2 is a top view showing the cassette viewed from above. The cassette 11 stores a normal transfer paper 16 on a transfer paper mounting table 12 rotatably supported on a side wall of the cassette 11. One end of the push-up member 14 is connected to the main body 1
7, and the other free end is arranged so as to come into contact with the lower surface of the transfer paper mounting table 12. The elastic material 15 has one end attached to the main body 17 and the other end attached to the push-up member 14, and the transfer paper mounting table 1 is attached via the push-up member 14.
A force is applied to push up 2. The transfer paper presser 13 has one end rotatably supported by the side wall of the cassette 11.
The other end has a shape that regulates the leading edge and top surface of the transfer paper 16. Further, a protrusion 13a is provided at a portion facing the side wall of the cassette 11, and this protrusion 13a is inserted into an elongated hole 11aKH provided in the cassette side wall by an appropriate size. Then, the protrusion 13a becomes movable by the length of the long axis of the elongated hole 11a, and the transfer paper presser member 13 is being moved.

As a result, the uppermost position of the pushed-up transfer paper 16 becomes a constant height h1 above the bottom surface of the cassette.

The height of the paper feed roller 19, which is rotatably mounted on the small main body, is also kept constant at h2. This is to stabilize the paper feeding force by always keeping the distance between the paper feed roller 19 and the transfer paper 16 constant, and to make the position of the fed transfer paper 16 into the main body 17 constant.

With the paper feed cassette 11 having the above configuration, the push-up member 14 obstructs the operation of attaching and detaching the cassette, and there are cases where the cassette cannot be attached or detached as desired. Therefore, the mechanism of the push-up member 14 itself is provided inside the main body of the cassette 11, and
Some devices are designed to push upward. This makes it much easier to attach and detach. However,
Conventionally, a coil spring or the like is provided from the lower part of the loading table 12 facing the paper feed roller 19 to push up the loading table 12, so that the paper storage capacity is reduced by the thickness of the spring.

<Object of the Invention> The present invention provides a paper feeding cassette/sorter that simplifies the operation of attaching and detaching a cassette for automatic paper feeding to a copying machine and does not reduce the paper storage capacity in the cassette. It is.

<Embodiment> The present invention will be described in detail using a paper feeding cassette for thick paper as an example.

FIG. 3 is a perspective view showing an embodiment of the paper feed cassette according to the present invention, FIG. 4 is an enlarged view of the main part of FIG. 3, and FIG. 5 is a sectional view taken along the line A-A in FIG. 4. .

In the figure, reference numeral 21 is a cassette main body that is detachably installed in a paper feed section of the main body of the copying machine. This cassette 21 has paper guides 22 at the bottom that regulate and guide both sides of thick letters such as postcards. A pedestal 23 with a regulating piece 23-1 on which a thick letter is placed and which regulates the rear end of the thick letter. A regulating claw 24 regulates the tip of the thick letter and feeds it one sheet at a time, a paper position regulating member 25 regulates the top position of the thick letter placed on the pedestal 23, and always pushes the pedestal 3 upward. Spring 26, spring holding material 27 for holding this spring 26. and a stopper 28 for regulating the movement range of the paper position regulating member 25.

In order to regulate the rear end of the thick letter, the pedestal 23 has both side edges bent approximately 9o0 to form a regulating piece 23-1, and an extension part 23-2 extending from the center thereof. .

The extension part 23-2 is bent into a dogleg shape as shown in the figure, and one end of the spring 26 is fixed to the upper part of the extension part 23-2. Since the other end of the spring 26 is attached to the spring holding member 27, the extension portion 2
3-'2 in a downward direction, and pushes up the pedestal 23 on which the paper is placed upwards about a rotating shaft 29, which will be described later.

Further, the pedestal 23 has a rotating shaft 29 protruding from the regulating piece 23-1, and this rotating shaft 29 is connected to the paper guide 22.
Since it is pivotally supported in the long hole 22-1 bored in the
It rotates around this rotating shaft 29. The other end of the spring 26 is fixed to a spring holding member 27 fixed to the bottom of the cassette, and pushing down the extension 23-2 pushes the pedestal 23 upward. The paper position regulating member 25 has claw portions 25-1 provided to oppose the corner portions of both ends of the thick letter and regulate the position of the paper, and is rotatably supported by the paper guide 22. , and a hole 25-2 for regulating the rotation range. chain hole 2
5-2 is inserted with a stopper 28 formed by appropriately cutting and bending the paper guide 22. Since the edge of the hole 25-2 is engaged with the stopper 28, the rotation range of the paper position regulating member 25 is regulated. A regulating claw 24 is fixed to the frontmost bent portion 25-3 of this sheet position regulating member 25, and the claw portion 25 of the paper feeding position regulating member 25
-1 and the tip of the regulating pawl 24, a gap d is formed as shown in FIG. 4 through which a sheet of thick paper can pass.

In the structure as described above, when the cassette 21 does not accommodate thick letters, the pedestal 23 is pushed upward by the spring 26, as shown in FIG. -1 is locked and pushed up. Therefore, the paper position regulating member 25 is also pushed up at the same time, but its movement is regulated by the stopper 28 and the hole 25-2, and each mechanism is stopped in the state shown in FIG.

Therefore, the pedestal 23 can be pushed down to the bottom of the cassette 21, and a large number of thick letters 30 can be accommodated within that range. In other words, the pedestal 23 can be pushed down regardless of the thickness of the spring 26, and the paper storage capacity is not reduced at all due to the thickness of the spring 26. When paper is stored in this manner, the top of the thick letter 30 is always located at the same height regardless of the number of sheets, as shown in FIG. 6, and the pedestal 23 is lowered by the thickness of the thick letter 30.

FIG. 6 shows the state in which the cassette 21 is mounted on the copy paper main body, and the paper feed roller 31 is shown opposite to this mounting portion. The paper feed roller 31 has a notch facing the thick letter 30 when not in operation, and rotates when in operation so that its circumferential surface comes into contact with the thick letter 30 and feeds the paper.

When the paper feed roller 31 rotates, the thick paper 30 at the top
-1 is the claw portion 25-1 of the paper position regulating member 25 and the regulating claw 24
The paper is fed through the entire distance d from the leading edge of the paper. At this time 1
The feeding of the next thick letter 30-2 is regulated by the regulating claw 24,
Only the uppermost thick letter 30-1 is fed as shown in FIG. Distance d between the claw portion 25-1 and the tip of the regulating claw 24
The gap is such that two or more sheets of H1 thick letters 30 cannot pass through.

As an example, a thick letter 30, for example, a postcard thickness of about 0.2
When 5 fins were bound at d=0.355-, double sheet feeding did not occur at all.

Here, in FIG. 6, the biasing force of the spring 26 is
It acts to press the thick paper 30-1 against the claw portion 25-1 of the paper feed claw 25. In this state, the top thick letter 30-1
It is difficult to feed paper. However, when feeding paper, the paper feeding roller 31 pushes down the entire thick paper 30 as shown in FIG.
The force exerted by the spring 26 between the claw portion 25-1 of the paper position regulating member 25 and the thick paper 30-1 is eliminated. This does not affect paper feeding in any way.

FIG. 8 shows the thick letter 3 of the claw portion 25-1 of the paper position regulating member 25.
A resin sheet material 32, such as a polymer resin sheet material 32 having a low coefficient of friction 5, is fixed to the opposite surface of the uppermost thick letter 30-.
1 and the claw portion 25-1 during paper feeding is further reduced.

In other words, when feeding paper, the uppermost thick letter 30-1 can be made to slide more smoothly, and the paper can be fed more smoothly.

It is appropriate that the resin sheet material 32 be secured using an adhesive.

As described above, during paper feeding, the biasing force of the spring 26 is applied to the paper feeding roller 31 and the thick paper 30-1 during paper feeding.
The thick letter 30-1 is fed with a stronger conveyance force.

Although the present invention has been explained using thick letters as an example, it is not limited to thick letters, and it goes without saying that the present invention can also be applied to light, flexible, and thin paper that has been commonly used in the past.

<Effects of the Invention> As explained above, with the paper feed cassette of the present invention, for example, a biasing means for pushing up the paper holder in the paper feed cassette is not provided at the bottom of the holder. Therefore, the paper accommodating capacity is not reduced due to the limitation of the urging means, and the cassette itself can be made smaller in size compared to a similar paper cassette. Furthermore, since the monitoring means is provided within the cassette, the operation of attaching and detaching the cassette becomes easier.

[Brief explanation of drawings]

1 and 2 are a sectional view and a top view showing an example of a conventional automatic paper feeding cassette, FIG. 3 is a perspective view showing an embodiment of the automatic paper feeding cassette according to the present invention, and FIG. 4 is an enlarged view of the main part of FIG. 3, FIG. 5 is a sectional view taken along the line A-A in FIG. 3, FIGS. 6 and 7 are sectional views of a cassette for explaining the operation of the present invention, and FIG. 1 is a partial cross-sectional view showing another embodiment of the present invention. 21: Cassette, 22: Paper guide, 23: Rest, 23
-2: Extension part, 24: Regulating claw, 25: Paper position regulating material,
25-1: Claw portion, 26: Spring, 27: Spring holding material, 31: Paper feed roller.

Claims (1)

[Claims] 1. Detachably installed in the paper feed section of the main body of the copying machine. In a paper feed cassette that accommodates a large number of sheets of paper, there is a holder that is rotatably provided within the cassette body to receive sheets of paper, an extension part that is bent to the holder, and a holder that is bent from the top to the bottom of the cassette body. A paper feeding cassette characterized by comprising biasing means for biasing in a direction.