JPH0324509Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a paper feeding device that is attached to a copying machine or the like and is capable of storing a large amount of paper.

[Conventional technology]

Conventionally, the paper feed device of a copying machine has a box-shaped cassette containing paper that is attached to the copying machine main body, and the paper in this cassette is fed one by one by engaging an entrance roller on the copying machine main body side. ing.

In this case, if the rotation of the entrance roller is controlled in accordance with the copying process, paper can be reliably fed.

However, a large-capacity paper feeding device is attached to the copying machine, and a paper feeding roller installed in this paper feeding device feeds the paper and sends it to the entrance roller of the copying machine, and the paper is sent to the entrance according to the copying process. Devices that feed using rollers have the following problems.

That is, when replenishing paper from the paper feeder, the leading edge of the paper does not bite into the stopped entrance roller, causing a paper jam.

Therefore, the applicant of the present invention previously proposed a configuration in which the inlet roller 52 and the driven roller 53 were configured to be able to move toward and away from each other, as shown in FIG.
It was published as a number.

When the leading edge of the paper reaches the entrance roller 52, the driven roller 53 is moved away from the entrance roller 52 to ensure that the paper enters, and after the leading edge of the paper reaches the entrance roller 52, the driven roller 53 is moved away from the entrance roller 52. It is brought into pressure contact with the roller 52. This eliminates the conventional paper jam problem.

On the other hand, in this device, since the roller 53 constitutes a movable guide that moves toward and away from the entrance roller 52, the frictional resistance between the paper and the driven roller 53 is small.
If the driven roller 53 and the entrance roller 52 are twisted as shown in the figure when the paper feed device is installed in the copying machine main body, there is a problem that the leading edge of the paper may be skewed from side to side.

[The problem that the idea attempts to solve]

Therefore, the applicant further proposed that the movable guide that separates from the entrance roller 52 be a non-rotating member, such as a plate-shaped guide 51, as shown in FIG. 1A.

This is because the frictional resistance between the paper and the plate-shaped guide 51 is large, so that even if the entrance roller 52 and the plate-shaped guide 51 make uneven contact, the paper is unlikely to be skewed.

On the other hand, if the movable guide is simply a rotating member as described above, there is a problem that when the paper feeding device is mounted on the main body of the copying machine, the tip of the guide 51 hits the entrance roller 52, making it difficult to mount the paper feeding device.

The purpose of this invention is to use a paper feeder in which a non-rotating guide provided on the paper feeder side approaches and separates from the entrance roller on the main unit side, so that when the paper feeder is attached to the main unit, the tip of the guide touches the entrance roller. To provide a paper feeding device that can be smoothly installed without bumping into each other.

[Means to solve the problem]

In order to achieve the above object, this invention provides a first inclined surface in the center of the second guide that is inclined upward with respect to the paper conveyance direction and that comes into contact with and separates from the entrance roller; A second inclined surface is provided at the leading end of the sheet, which slopes downward with respect to the sheet conveyance direction and comes into contact with the entrance roller when the sheet is attached to the loading port of the sheet conveyance section.

[Effect]

Since the second guide is provided with a first inclined surface in the center thereof that is inclined upward with respect to the paper conveyance direction and that comes into contact with and separates from the entrance roller, it is easy to guide the paper between the second guide and the entrance roller. .

In addition, a second inclined surface is provided at the tip of the second guide that is inclined downward with respect to the paper transport direction and comes into contact with the entrance roller when the paper transport unit is installed, so that the paper feed device can be installed in the loading slot. The second guide can be inserted smoothly without hitting the entrance roller.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 2 to 4.

<Structure> As shown in FIG. 2, a paper feeding device B is attached to the loading port 1 of a main body device, for example, a copying machine main body A.

The copying machine main body A has a normal configuration and includes a copying optical system and a transfer/printing mechanism built therein. An entrance roller (paper feed roller) 2 is provided in the loading port 1 . When the paper feeding device B is not used, a cassette (not shown) containing paper is loaded into the loading slot 1, and the entrance roller 2 engages with the topmost paper in the cassette to feed it and send it to the feed roller 3. It's getting old.

The paper feed device B has a paper storage section B2 in which paper is loaded.
and a paper ejecting section B1 that fits into the loading port 1.

The paper storage section B2 includes a loading table 6 on which paper is loaded.
and a paper feeding means 7 such as a roller or an endless belt that engages with the uppermost paper on the feeding table 6 and feeds the paper toward the paper delivery section B1.

The paper loading table 6 is supported in a guide groove 9 provided in the paper storage frame 8 so as to be able to rise and fall freely, and is coupled to a drive shaft 11 connected to a drive motor M via a suspension member 10. It is raised and lowered by reverse rotation.

Corner claws 12 are provided to separate sheets of paper fed out by the paper feeding means 7 one by one.

A paper sensor S1 is disposed on the discharge guide 4 below the entrance roller 2.

When this paper sensor S1 does not detect paper,
That is, when no paper is prepared on the entrance roller 2, the paper feeding means 7 is driven and the paper storage section B2 is loaded.
The paper is fed out from the holder.

Further, the paper sensor S1 determines that a paper jam has occurred when the paper does not arrive after a predetermined period of time after the paper feeding means 7 is activated, and lowers the feeding table 6.

The paper discharge section B1 has a discharge guide 4 that guides the paper fed out from the paper discharge section B2 to the entrance roller 2.

To explain this with reference to FIG. 2 and FIG. 3, the unloading guide 4 includes a fixed first guide 4a that guides the paper fed out by the paper feeding means 7 in the direction of the entrance roller 2, and an entrance guide 4a. It is composed of a non-rotating member, for example, a plate-shaped second guide 4b, which is movable toward and away from the roller 2 and guides the paper fed by the paper feeding means 7 to the entrance roller 2.

The second guide 4b in this example is pivotably supported, and includes an actuation solenoid 14 that separates the second guide 4b from the inlet roller 2, and an actuation solenoid 14 that separates the second guide 4b from the inlet roller 2.
A biasing spring 15 is connected thereto, which always biases the inlet roller 2 in a direction in which it comes into pressure contact with the inlet roller 2.

Then, when the leading edge of the paper from the paper feeding means 7 reaches the entrance roller 2, the second guide 4b is moved away from the entrance roller 2 to form a paper entry gap, so that the leading edge of the paper reaches the entrance roller 2. After reaching the entrance, the CPU controls it so that it comes into pressure contact with the entrance roller 2.
Control means (not shown) such as the following are provided.

The central part of the second guide 4b is provided with an upward slope with respect to the conveying direction of the paper to facilitate guiding the paper between the second guide 4b and the entrance roller 2. The first inclined surface 4
d is formed.

Further, at the tip of the second guide 4b, when inserting the paper feeder B into the loading slot 1, a second guide 4b is provided.
so that it does not hit the inlet roller 2.
A second inclined surface 4c is formed that is inclined downward with respect to the paper conveyance direction.

Further, at the rear end of the second guide 4b, a first
so that the paper guided along the second guide 4a is smoothly transferred to the second guide 4b.
A third slope 4e is formed that slopes downward from the first slope 4c.

The upper surface of the second guide 4b that comes into pressure contact with the entrance roller 2 has a coefficient of friction between the upper surface and the paper that is smaller than that between the entrance roller 2 and the paper. In this example, since the inlet roller 2 is made of a rubber material, the upper surface of the second guide 4b is coated with polytetrafluorothene (trade name: Teflon). This polytetrafluorothene is known to have a necessarily low coefficient of friction against paper.

<motion> Next, the operation of the above device will be explained.

As shown in FIG. 4C, when inserting the paper unloading section B1 of the paper feeder into the loading slot of the copying machine main body A, the inclined surface 4c of the tip of the second guide 4b that is in contact with the entrance roller 2 Guided and inserted.

When there is no paper on the entrance roller 2, the operating solenoid 14 is energized by the no paper signal from the paper sensor S1, and the second guide 4b is separated from the entrance roller 2 as shown in FIG. 4A. A paper entry gap d is formed between the entrance roller 2 and the second guide 4b. The paper feeding means 7 is activated by a paper out signal from the same sensor S1 and feeds out the paper.

The paper fed by the paper feeding means 7 is fed to the second guide 4a, the third slope 4e at the rear end of the second guide 4b, and the first slope at the center of the second guide 4b.
The paper is guided to the paper entry gap d along the inclined surface 4d of the paper.

When the paper sensor S1 detects that the leading edge of the paper has entered the paper entry gap d, the paper feeding means 7 is stopped and the operating solenoid 4 is demagnetized.
The second guide 4b is pressed against the entrance roller 2 by the biasing spring 15 as shown in FIG. 4B. Therefore, the leading edge of the paper is held between the entrance roller 2 and the second guide 4b.

Waiting in this state, the inlet roller 2 rotates in response to a paper feed instruction signal from the copying machine main body A, and feeds the paper into the copying machine main body A.

When the paper sensor S1 detects passage of the trailing edge of the paper sent out by the entrance roller 2, the paper feeding means 7
1 and energizes the operating solenoid 14 to move the second guide 4b away from the entrance roller 2 as shown in FIG. 1A, and repeat the above operation.

<Effects of Examples> The above device provides the following effects.

(1) Since the second guide 4b, which can move toward and away from the entrance roller 2, is configured as a plate-shaped non-rotating member, the frictional resistance between the paper and the second guide 4b is large, and the friction between the entrance roller 2 and the second guide 4b is large. Even if the paper contacts the guide 4b unevenly, no skew occurs in the paper.

(2) Since the tip of the second guide 4b is formed with an inclined surface 4c that slopes downward with respect to the paper conveyance direction, when inserting the paper feeder into the loading slot 1, the second guide 4b 4b can be inserted smoothly without hitting the entrance roller 2.

(3) At the center of the second guide 4b, there is a first inclined surface 4d that is inclined upward with respect to the paper conveyance direction.
is formed, so the paper is moved to the second guide 4.
b and the entrance roller 2.

(4) A third slope 4e that slopes downward from the first slope 4c is formed at the rear end of the second guide 4b, so that the second guide 4b is guided along the first guide 4a. The paper is smoothly transferred to the second guide 4b.

[Effect of idea]

The invention described above includes a first guide that guides the paper toward the entrance roller on the main device side;
In a paper feeding device that includes a second guide that can freely move toward and away from the entrance roller, a first guide that is inclined upward with respect to the paper conveyance direction and that moves toward and away from the entrance roller is disposed in the center of the second guide. Since the inclined surface is provided, it is easy to guide the paper between the second guide and the entrance roller.

In addition, a second inclined surface is provided at the tip of the second guide that is inclined downward with respect to the paper transport direction and comes into contact with the entrance roller when the paper transport unit is installed, so that the paper feed device can be installed in the loading slot. The second guide can be inserted smoothly without hitting the entrance roller.

[Brief explanation of the drawing]

Fig. 1 A and B are explanatory diagrams of the preceding device, Fig. 2 is an overall explanatory diagram showing one embodiment of this invention, Fig. 3 is an explanatory diagram of its main parts, and Fig. 4 A to C are illustrations of the operating state. It is an explanatory diagram. A... Copying machine main body, B... Paper feeding device, B1...
Paper delivery section, B2... Paper storage section, 7... Paper feeding means, 2... Entrance roller, 4a... First guide,
4b... second guide, 4c... second inclined surface,
4d...first inclined surface, 4e...third inclined surface,
14... Operating solenoid, 15... Biasing spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A paper storage unit that stores and stores paper; a paper delivery unit that extends from the paper storage unit and is detachable from the loading port of the main device; and a paper storage unit that stores paper in the paper storage unit. a paper feeding unit that feeds out the paper to the paper delivery unit; a first guide that guides the paper fed out by the paper feeding unit in the direction of an entrance roller provided in the main unit; and a first guide that is freely movable toward and away from the entrance roller. and a second guide that guides the paper fed out by the paper feeding means to the entrance roller, the second guide having a second guide inclined upwardly with respect to the paper conveyance direction in a central part of the second guide. , a first inclined surface that comes into contact with and separates from the entrance roller is provided at the tip of the second guide, and is inclined downward with respect to the sheet conveyance direction, and when installed in the loading port of the sheet conveyance section. A paper feeding device characterized in that a second inclined surface is provided that contacts the entrance roller. (2) The second guide has the first guide at its rear end.
2. The paper feeding device according to claim 1, further comprising a third inclined surface that is inclined downwardly from the inclined surface.