JPS6392543A - Paper conveying device for copying machine - Google Patents

Abstract

PURPOSE:To facilitate the removal of a sheet of paper at a nipped part by enabling one of pulleys for guiding a belt to be brought into contact with an separated from a conveying roller and removing pressure to said conveying roller by the movement of said pulley. CONSTITUTION:A belt 12 is guided by two or more pulleys 13a-13c, one pulley 13b of these is formed to be brought into contact with and separated from a conveying roller 10, and pressure to the conveying roller 10 due to the belt 12 can be removed by moving the pulley 13b. And, the action of moving the pulley 13b is interlocked with the opening/closing of a top cover 5 and, when the top cover 5 is opened, the nipping action by the belt 12 can be automatically removed. Accordingly, when the jam of a sheet of paper occurred, the sheet of paper can be released at the nipping part by opening the top cover 5, thereby, facilitating the removal of the sheet of paper.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper conveyance device for a copying machine, and in particular, the present invention relates to a paper conveyance device for a copying machine, and in particular, a paper conveyance device for conveying paper separated from a photoreceptor drum while being held between a conveyance roller and a belt. The present invention relates to a device configured to easily release the paper clamping action.

(Prior Art) In devices such as copying machines and printing presses, conveyance rollers are conventionally used to peel paper from the photoreceptor drum or print master on which an unfixed image is formed and convey it toward a fixing device. A device is used in which paper is conveyed while being held between a belt device and a belt device.

In such a conveyance device, the back side of the paper is brought into contact with the conveyance roller, and the belt is brought into contact with the surface on which the unfixed toner image has been transferred, and the areas on both sides where no image is formed. , a nip action is performed on the paper.

One example of the conventionally used apparatus described above is the apparatus shown in FIGS. 4 and 5. In this conventional device 33, the belt 12 of the belt device 11 is provided so as to be in contact with the conveyance port 510 over a predetermined angle. This belt 12 is designed to be wound around a plurality of pulleys 13.
The paper P is sandwiched between the belt 12 and the conveyance roller 10 and conveyed.

Further, the back surface of the paper P is brought into contact with the transport roller 10, and the belt 12 is brought into contact with the surface portion of the paper P onto which the unfixed toner image has been transferred, and the portions on both sides of which no image is formed. The nip is performed in such a state that the unfixed toner image is not affected when the paper is transported.

(Problem that the investigation aims to solve) However, in the conventional conveyance device as described above, paper jams occur at the part where the paper is separated from the photoreceptor drum, etc., that is, at the nip between the conveyance roller and the belt. In this case, in order to remove the paper, it is necessary to rotate the conveyance roller and discharge the paper from the nip portion.

Furthermore, if the transport rollers are not rotated by hand, it is necessary to open the top cover of the copying machine and manually pull out the jammed paper.

However, when pulling out paper by hand, the belt is pressed against the conveyance roller with a constant pressure and is set to grip the paper, so the nip area If the paper is torn and the cut pieces remain in the nip, the paper jam signal may not be released and subsequent operations may not be possible. As shown in the figure, if the belt is pulled forcefully in the lateral direction, undesirable conditions such as the belt coming off the pulleys may occur.

(Objective of the Invention) The present invention solves the drawbacks of conventionally used devices as described above, and allows the paper to be easily released from the nipped state when removing paper that is being held in the nip. Our goal is to provide a device that will allow you to do so.

(Means and Effects for Solving the Problems) A paper conveyance device for copying according to the present invention is provided with a conveyance roller and a belt that is pressed against the conveyance roller at a predetermined angle. By sandwiching paper between
In a conveying device configured to perform a conveying action, a belt in contact with one side of the conveying roller is guided by two or more pulleys, and one of the pulleys is guided by two or more pulleys.
This device is configured such that one of the belts can be moved toward and away from the conveyance roller, and by moving the pulley, the pressure on the conveyance roller by the belt can be released.

In the paper conveying device of the copying machine of the present invention, the operation of swinging the one pulley is configured to be linked to the space between the top cover, so that when the top cover is opened, the belt is automatically moved. The structure is such that it is possible to cancel the nip effect caused by the

Therefore, in the apparatus of the present invention, when a paper jam occurs, by opening the top cover,
Since the paper can be released at the nip, the work of removing the paper can be performed very easily.

(Embodiment) The configuration of a paper conveyance device of a copying machine according to the present invention will be described according to an illustrated embodiment.

As shown in FIG. 1, the copying machine main body 1 includes a photoreceptor drum 2, an optical system device for inputting image information to the photoreceptor drum, a developing device, a fixing device δ, etc., and a feeder. A paper feeding device and the like, which are components of the paper transport path following the paper device, are provided in the same manner as in a normal copying machine.

Then, the toner image formed on the photosensitive drum 2 is transferred to paper, and then the conveying roller 10 and the belt device 11
The material is delivered to a clamping and conveying device consisting of:

Further, in the copying machine of the present invention, like a commonly used copying machine, a top cover 5 is provided on the top of the copying machine main body 1, and by opening the top cover 5, the copying machine can be opened. Various devices inside the main body 1 can be inspected.

As shown in FIG. 2, the photosensitive drum 2 of the present invention is provided with a separation belt 3 at a side portion thereof located outside the image forming section, and the separation belt 3 separates the paper. The action of

A separation plate 4 is provided at a portion where the paper is separated by the separation belt 3, and the separation plate 4 sends out the separated paper toward the conveyance roller 10.

A belt 12 is attached to the conveyor roller 10 and is in contact with the periphery of the conveyor roller 10.
A belt device 11 consisting of the following is provided.

As shown in the conventional example in FIG. 5, the belt device 11 of the present invention is disposed outside the image forming portion at the end of the conveyance roller 10. In this case, the belt 12 is wound around three pulleys 13a to 13c, and the belt 12 is pressed around the conveyance roller 10, so that the belt 12 is interlocked with the conveyance roller 10.

Among the three pulleys, the pulley 13b is supported by an arm 15, and when the arm 15 swings about a shaft 16, the belt 12 wound around the pulley 13b is conveyed. It is in a state where it can move into and out of contact with the surface of the roller 10.

In the paper conveyance device for a copying machine according to the present invention, the protruding end of the arm 15 is locked by a stopper 19 provided on the frame of the copying machine, and in this state, the pulleys 13a and 13b and transport roller 1
The contact portion of the belt 12 that contacts the surface of the conveyance roller 10 is set at 62 degrees with respect to the central axis of the conveyance roller 10. This angle is necessary to nip the paper between the two members and set the conveyance direction thereof.

Further, the arm 15 of the present invention is biased clockwise by a torsion spring 17, and the top cover 5
When the top cover 5 is closed, the second
As shown, the end of its arm 15 becomes positioned on the stop 19, thereby forcing the belt 12 around the transport row 510 to form a nip, as described above. The state is set to

The nip between the conveyance roller 10 and the belt 12 is
Two pulleys 13a and 13b are used without providing pulley 13C.
Even if the belt 12 is wound around the belt 12 to form a belt device, a similar state can be achieved. Further, the pulley 13a of the present invention does not need to be provided so that the belt 12 wound around it directly contacts the conveyance roller 10 at that position, but it is of course possible to provide it at a slightly distant position. It is.

FIG. 3 is a diagram showing the state when the top cover 5 is opened. As shown in the figure, when the top cover 5 is opened, the arm 15 is released from the pressed state by the leaf spring 6 and is swung clockwise by the torsion spring 17 provided at @16. Therefore, that arm 15
Since the pulley 13b provided on the pulley 13b is rotated clockwise at the same time, it is separated from the conveyance roller 10, and the belt 12 wound around the pulley 13b is separated from the conveyance roller 10, thereby releasing the nip state between the two members.

When the jammed paper is removed from the nip portion, the top cover 5 is removed in the above-described state.
By opening, the conveyor row 510 by the belt 12
Since the pressure on the nip is released, the nip portion is automatically released, and the paper can be easily removed.

In the device of the present invention described above, the force relationship between the leaf spring 6 and the torsion spring 17 is set as follows: leaf spring>>torsion spring.

Therefore, in the device of the present invention, the top cover 5
When the arm 15 is closed, the pressing force of the leaf spring 6 stops the arm 15 at the fixed position shown in FIG. A section will be formed.

Further, when the top cover 5 is opened and the pressing force applied to the arm 15 by the leaf spring 6 is released, the arm 15 is first swung by the torsion spring 17, and the state shown in FIG. 3 is set. It turns out.

Therefore, in the device of the present invention, when the jam processing is completed and the top cover 5 is closed, the leaf spring 6
The pressing part 7 is first brought into contact with the point B, and the arm 15 is swung counterclockwise in such a state that the pressing part 7 gradually slides toward the point B, and is stopped at a position m. It turns out.

(Effects of the Invention) Since the paper conveying device of the copying machine of the present invention has the above-described configuration, if a jam occurs in the portion that receives the paper peeled from the photoreceptor drum, the top cover By simply opening the paper, the nip in that area can be released and the paper can be easily removed.

In addition, with the device of the present invention, there is no need to forcefully pull out the paper, so there is no need to damage the jammed paper or leave torn paper behind, causing a warning to appear on the display. This eliminates the need to place an extra burden on the operator.

[Brief explanation of the drawing]

Fig. 1 is a detailed explanatory diagram of the present invention, Fig. 2 is an explanatory diagram showing the set state of the paper conveying device for copying according to the present invention, Fig. 3 is an explanatory diagram with the top cover opened, and Fig. 4 5 is an explanatory diagram of a conventional example, and FIG. 5 is a plan view thereof. Reference numeral 1 in the figure: Copying machine main body, 2: Photosensitive drum, 3: Separation belt, 4: Separation plate, 5... ...Top cover, 6...
Leaf spring, 7... Pressing part, 10... Conveyance roller, 11... Belt device, 12...
・Belt, 13...Pulley, 15...
Arm, 16... shaft, 17... torsion spring, 19... stopper.

Claims (1)

[Claims] A conveyance roller and a belt that is in contact with the conveyance roller at a predetermined angle are provided, and the sheet is held between both members so that the conveyance action can be performed. In this conveying device, a belt in contact with one side of the conveying roller is guided by two or more pulleys, one of the pulleys is configured to be able to move toward and away from the conveying roller, and the belt that is in contact with one side of the conveying roller is guided by two or more pulleys. 1. A paper conveying device for a copying machine, characterized in that the pressure on the conveying roller by the belt can be released by moving the sheet conveying device.