JP2001315979A - Recording medium carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording medium carrying device capable of facilitating and ensuring the installation of a roller unit to a normally operable position in a paper feed part and significantly shortening the time required for the installation. SOLUTION: This recording medium carrying device comprises a pulling roller 2, a separating carrying roller 4, a retaining member 6, and a transmitting means 17, which are formed as an integrated unit. This device further comprises a projection part 6b arranged on the opposite end to the pulling roller 2 of the retaining member 6 to make contact with the inside of the upper wall surface of the paper feed part 19 and an opening part 19a bored in a part of the upper wall surface of the paper feed part 19, to which the projection part 6b is inserted by installing the unit in a normal position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium transport device used for an image forming apparatus.

[0002]

2. Description of the Related Art In an image forming apparatus, an electrostatic latent image is formed by charging a drum-shaped photosensitive member and irradiating a laser beam in accordance with an image to be projected, and developing the electrostatic latent image with toner. Is becoming

Hereinafter, a conventional image forming apparatus and a conventional recording medium transport apparatus will be described with reference to the drawings.

FIG. 3 is a block diagram showing an apparatus configuration of the image forming apparatus. FIG. 4 is a perspective view of a main part showing a state in which a roller unit is mounted at a normal position in a conventional recording medium conveying apparatus. FIG. 9 is a perspective view of a main part showing a state in which a roller unit is not mounted at a normal position in a conventional recording medium transport device.

In FIG. 3, reference numeral 1 denotes printer paper or OH
A sheet-like recording medium such as a P film, 2 is a pull-in roller disposed above the laminated recording medium 1, 3 is a rotation axis of the pull-in roller 2, 4 is a separation conveyance roller, and 5 is a separation conveyance roller 4. Rotation axis, 6 is the rotation axis of the pull-in roller 3
And a holding member for connecting the rotating shaft 5 of the separation conveyance roller to the separation conveyance roller 7, a multiple conveyance prevention roller 7 disposed in proximity to the separation conveyance roller 4, an auxiliary roller 8, and a base material 9 made of aluminum or the like. A photoreceptor having a photoreceptor layer coated thereon in the form of a thin film, a charger 10 disposed in close proximity to the photoreceptor 9 for charging the photoreceptor 9, and 11 irradiating the charged photoreceptor 9 to irradiate the electrostatic latent image , A developing device 12 for visualizing the electrostatic latent image formed on the photoconductor 9, a transfer roller 13 for transferring the image visualized by the developing device 12 to the recording medium 1,
Reference numeral 14 denotes a cleaning device for cleaning the photoconductor 9, and reference numeral 15 denotes a fixing device.

In FIG. 4 or FIG. 5, reference numeral 2 denotes a pull-in roller disposed above the stacked recording media 1;
Is the rotation axis of the pull-in roller 2, 4 is the separation conveyance roller, 5
Is a rotation shaft of the separation conveyance roller 4, 6 is a holding member for connecting the rotation shaft 3 of the pull-in roller and the rotation shaft 5 of the separation conveyance roller, 7 is a multiple conveyance prevention roller arranged close to the separation conveyance roller 4, 16 Is a drive lever which is connected to a lifting mechanism (not shown), and which is rotated by its power to rotate the holding member 6 to raise and lower the pull-in roller 2, and 6a is a connection surface on which the drive lever 16 is pressed against the holding member 6 , 17 are transmission means for connecting the rotation shaft 3 of the pull-in roller and the rotation shaft 5 of the separation / conveyance roller, and transmitting the rotation of the separation / conveyance roller 4 to the pull-in roller 2; (Not shown), a bearing constituted by a one-way clutch, and 19 is a housing-shaped paper feeding unit.

The operation of the conventional image forming apparatus and the conventional recording medium transport apparatus configured as described above will be described below.

When the image forming apparatus is started, the pull-in roller 2 descends and presses against the uppermost one of the recording medium 1 to carry it. The transported recording medium 1 is further sent to the separation transport roller 4. A drive source is connected to the rotation shaft 5 of the separation / conveyance roller 4, and the rotation force from this drive source is also transmitted to the pull-in roller 2 by the transmission means 17.

Here, the raising and lowering of the pull-in roller 2 is shown in FIG.
As shown in the figure, the rotation is performed by the rotation of the holding member 6. The holding member 6 is supported by the drive lever 16 on the connecting surface 6a, and the drive lever 16 is rotated by the power of the elevating mechanism, so that the holding member 6 rotates about the rotation shaft 5 of the separation / conveyance roller. The rotation of the holding member 6 causes the pull-in roller 2
Moves up and down.

Here, the lifting mechanism is a mechanism that is connected to the drive lever 16 by a shaft and rotates the drive lever by rotating the shaft.

The holding member 6 connects the rotating shaft 5 of the separation / conveying roller and the rotating shaft 3 of the pull-in roller, but is held by a rotatable member so as not to hinder the rotation of the two rotating shafts. I have.

The separation / conveyance roller 4 is provided with a multiple conveyance prevention roller 7 which rotates in the direction opposite to that of the separation / conveyance roller 4 and is disposed close to the separation / conveyance roller 4 when a plurality of recording media 1 are stacked and conveyed at a time. , Except for the top one recording medium,
The uppermost recording medium 1 is separated by the multiple conveyance prevention roller 7 to prevent conveyance.

The recording medium 1 conveyed by the separation conveyance roller 4 is conveyed to the photosensitive member 9 by the auxiliary roller 8. The photoreceptor layer of the photoreceptor 9 is uniformly charged by the charger 10, and the irradiation of the laser beam 11 neutralizes the charge of the photoreceptor layer in accordance with the image, thereby forming an electrostatic latent image.

Further, the formed electrostatic latent image is transferred to the developing device 12
And is transferred to the recording medium 1 by the transfer roller 13.

Finally, the recording medium 1 to which the image has been transferred is fixed in the fixing unit 15 by pressure and heat.

The photoreceptor 9 on which the image has been transferred is
The toner is cleaned by the cleaning device 14, and the next image is formed.

Among the above components, the pull-in roller 2
In addition, the separation / conveyance roller 4 is highly worn and needs to be replaced with a new part at regular intervals. In this case, the holding member 6 must be removed, and the number of parts to be replaced is large. It was hanging. Therefore, the pull-in roller 2, the separation / conveyance roller 4, the holding member 6, and the transmission unit 1
A recording medium transport device 7 is formed as an integral roller unit and can be detachably attached to the paper feed unit 19.

[0018]

However, the above-mentioned conventional recording medium transport apparatus has the following problems.

That is, in the above-mentioned conventional recording medium conveying apparatus, the roller unit is mounted on the sheet feeding section 19 by connecting the rotating shaft 5 of the separation conveying roller in the roller unit to the driving source. As shown, the roller unit is moved to the sheet feeding portion 19 at a position where the drive lever 16 is not connected to the connection surface 6a.
In this case, since the operation of the drive lever 16 is not transmitted to the holding member 6, the draw-in roller 2 does not move up and down, and the recording medium is not conveyed.

According to the present invention, there is provided a recording apparatus capable of simply and reliably mounting a roller unit at a position where a roller unit operates normally in a paper feeding section and greatly reducing the time required for mounting. It is intended to provide a medium transport device.

[0021]

In order to achieve this object, a recording medium transporting device according to the present invention comprises a housing-shaped paper feeding section for storing stacked sheet-shaped recording media, and an upper portion of the recording medium. A pull-in roller that is disposed to be able to move up and down, and that presses and conveys the recording medium by pressing, a separation conveyance roller that separates and conveys the recording medium conveyed by the drawing roller, and is connected to a rotation shaft of the separation conveyance roller. A driving source, a transmission means for connecting a rotation axis of the drawing roller and a rotation axis of the separation conveyance roller, and transmitting rotation of the separation conveyance roller to the drawing roller; a rotation axis of the drawing roller and the separation conveyance. A holding member rotatably mounted on a rotating shaft of the roller, for moving the pull-in roller up and down, and a driving lever connected to the holding member for rotating the holding member; An elevating mechanism for swinging the drive lever, and a multi-conveyance preventing roller disposed in proximity to the separation and conveyance roller and rotating in a direction opposite to the separation and conveyance roller, wherein the pull-in roller and the separation and conveyance roller Wherein the holding member and the transmitting means are formed as an integral unit, and wherein the unit is detachably mounted on the paper feeding unit, wherein the pull-in roller of the holding member is connected. A projection formed at the end opposite to the side and contacting the inside of the upper wall surface of the paper feeding unit; and a hole pierced in a part of the upper wall surface of the paper feeding unit, when the unit is mounted in a normal position. And an opening through which the protrusion is inserted.

According to this configuration, the roller unit can be easily and reliably mounted at a position where the roller unit operates normally, and the time required for mounting can be greatly reduced.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A recording medium transporting device according to a first aspect of the present invention is provided with a housing-like paper feeding section for storing stacked sheet-shaped recording media, and a vertically movable upper and lower recording media. A pull-in roller that presses and conveys the recording medium by pressing the recording medium; a separation / conveyance roller that separates and conveys the recording medium conveyed by the pull-in roller; a driving source connected to a rotation shaft of the separation / conveyance roller; A transmission means for connecting the shaft and the rotation axis of the separation conveyance roller to transmit the rotation of the separation conveyance roller to the drawing roller; and a rotation roller rotatably mounted on the rotation shaft of the drawing roller and the rotation shaft of the separation conveyance roller. , A driving lever connected to the holding member and rotating the holding member, an elevating mechanism for swinging the driving lever, and a separation conveyance roller disposed close to the separation conveyance roller. Has a multicarrier prevention roller rotating La opposite direction, a drawing roller, the separating and conveying roller,
The holding member and the transmission means are formed as an integral unit,
A recording medium transport device in which a unit is detachably attached to a paper feeding unit, and is formed at an end of the holding member opposite to a side to which a pull-in roller is connected, and is in contact with an inside of an upper wall surface of the paper feeding unit. And an opening that is perforated in a part of the upper wall surface of the paper feeding unit and through which the projection is inserted when the unit is mounted in a normal position.

With this configuration, the following operations are provided.

(1) Since the driving lever for rotating the holding member can be reliably pressed against the connecting surface in the holding member, the operation of the driving lever can be transmitted to the holding member, and the pull-in roller moves up and down. Thus, the recording medium can be reliably transported.

(2) By contacting the projection with the inside of the upper wall surface of the paper feed unit and aligning the rotation axis of the separation / conveyance roller with the bearing of the drive source, the roller unit can be supported at two points to the paper feed unit. It can be mounted, and when removing the roller unit, the roller unit can be removed by rotating the holding member, pulling out the protrusion from the opening, and removing the rotating shaft of the separation conveyance roller from the bearing of the drive source as it is, Even a person who is not used to replacing the roller unit can easily attach and detach the roller unit, and can reduce the time required for attaching and detaching the roller unit.

Here, the projection is formed integrally with or connected to the holding member, but is preferably formed integrally so as not to be separated from the holding member.

The shape is arbitrary such as trapezoidal shape, quadrangular prism shape, column shape, blade shape and the like.

Further, the opening is perforated in a part of the sheet feeding section, and the holding member is rotatable when the projection is inserted.

If the size of the opening is too small, the projection cannot be sufficiently inserted, and if it is too large, dust or the like tends to enter the image forming apparatus, and neither is preferable.

(Embodiment) FIG. 1 is a perspective view of a main part of a recording medium transporting apparatus showing a state before a rotary shaft is connected to a bearing of a drive source in an embodiment of the present invention, and FIG. FIG. 9 is a perspective view of a main part of the recording medium transporting device, showing a state after the rotation shaft is connected to the bearing of the drive source in the embodiment.

The same components as those described with reference to FIGS. 3 to 5 are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 1 or FIG. 2, reference numeral 2 denotes a pull-in roller, 3 denotes a rotation axis of the pull-in roller 2, 4 denotes a separation and conveyance roller, 5 denotes a rotation axis of the separation and conveyance roller 4, and 6 denotes a rotation axis 3 and a rotation axis 5. A holding member to be connected, 7 is a multiple conveyance prevention roller,
Reference numeral 16 denotes a drive lever, and reference numeral 17 denotes a connection between the rotation shaft 3 of the pull-in roller and the rotation shaft 5 of the separation conveyance roller.
A transmission means for transmitting the rotation of the roller to the pull-in roller 2, 18 is a bearing, 19 is a paper feeding portion of a housing, 6a is a connecting surface on which the driving lever 16 is pressed against the holding member 6, and 6b is formed on one surface of the holding member 6. The projection member 19a is an opening formed in a part of the paper feeding unit 19, and 19b is a wall surface of the paper feeding unit 19 with which the projection member 6b contacts.

The operation of the thus configured recording medium transporting apparatus according to the present embodiment will be described below.

When the roller unit in the recording medium transport apparatus according to the present embodiment is mounted, as shown in FIG. 1, the rotating shaft 5 of the separation transport roller is connected to the bearing 1 of the drive source.
8 and the projection member 6 b is attached to the wall surface 19.
The sheet is put into the sheet feeding section in a state of being supported at two points brought into contact with the sheet b. At this time, the drive lever 16 is arranged so that it can be connected to the connection surface 6a.

Further, in order to connect the rotating shaft 5 of the separation / conveyance roller 4 to the bearing 18 of the driving source, the entire roller unit is slid in the direction a. As shown in FIG. Arranged at the lower part, contact with the wall surface 19b is avoided.

As a result, when the drive lever 16 is rotated in the direction b, the holding member 6 can be rotated in the direction c, and the pull-in roller 2 is lowered by its own weight in the direction d to convey the recording medium.

As described above, since the recording medium transporting apparatus according to the present embodiment is configured, it has the following advantageous effects.

(1) The drive lever is inserted by bringing the protrusion into contact with the inside of the wall of the paper feed unit, aligning the rotation axis of the separation / conveyance roller with the bearing of the drive source, and inserting the roller unit into the paper feed unit. Since the pressure can be reliably brought into contact with the connection surface in the holding member, the operation of the drive lever can be transmitted to the holding member, and the pull-in roller can be reliably moved up and down.

(2) The protrusion is brought into contact with the inside of the upper wall surface of the paper feed unit, and the roller shaft is inserted in the paper feed unit with the rotation axis of the separation / transport roller aligned with the bearing of the drive source. The roller unit can be removed by rotating the holding member, pulling out the protrusion from the opening, and removing the rotating shaft of the separation / conveyance roller from the bearing of the drive source. Even those who do not can easily attach and detach, and the time required for attaching and detaching can be shortened.

[0041]

As described above, according to the recording medium transport apparatus of the present invention, the following advantageous effects can be obtained.

According to the first aspect of the present invention, (1) the drive lever for rotating the holding member can be securely pressed against the connecting surface in the holding member, so that the operation of the driving lever is applied to the holding member. It is possible to provide a recording medium transporting device that can transmit the recording medium and that can raise and lower the pull-in roller to reliably transport the recording medium.

(2) The protrusion is brought into contact with the inside of the upper wall surface of the paper feeding unit, and the roller shaft is inserted in a state where the roller unit is positioned in the paper feeding unit with the rotation axis of the separation / conveyance roller aligned with the bearing of the drive source. The roller unit can be removed by rotating the holding member, pulling out the protrusion from the opening, and removing the rotating shaft of the separation / conveyance roller from the bearing of the drive source. It is possible to provide a recording medium transport device that can be easily mounted and removed even by a person who does not have it, and can shorten the time required for mounting and removing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a recording medium conveyance device showing a state before a rotation shaft is connected to a bearing of a drive source in an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the recording medium transporting device, showing a state after the rotation shaft is connected to a bearing of a driving source in the embodiment of the present invention.

FIG. 3 is a block diagram illustrating an apparatus configuration of the image forming apparatus.

FIG. 4 is a perspective view of a main part showing a state in which a roller unit is mounted in a normal position in a conventional recording medium conveying device.

FIG. 5 is a perspective view of a main part showing a state in which a roller unit is not mounted at a normal position in a conventional recording medium conveyance device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording medium 2 Pull-in roller 3 Rotation axis of a pull-in roller 4 Separation conveyance roller 5 Rotation axis of a separation conveyance roller 6 Holding member 6a Connecting surface 6b Projection part 7 Multiple conveyance prevention roller 8 Auxiliary roller 9 Photoconductor 10 Charger 11 Laser beam 12 Developing device 13 Transfer roller 14 Cleaning device 15 Fixing device 16 Drive lever 17 Transmission means 18 Bearing 19 Paper feed unit 19a Opening 19b Projection contact surface

Continuation of the front page F term (reference) 3F343 FA02 FB01 FC22 GB01 GD01 JA14 JA20 JD09 JD32 KB05 KB13 LA02 LA16 LD27 LD28 LD29

Claims (1)

[Claims] 1. A paper feed unit having a housing that stores stacked sheet-shaped recording media, a draw-in roller that is disposed above and below the recording media so as to be able to move up and down, and presses and conveys the recording media. A separation conveyance roller for separating and conveying the recording medium conveyed by the drawing roller, a driving source connected to a rotation shaft of the separation conveyance roller, and a connection between the rotation shaft of the drawing roller and the rotation shaft of the separation conveyance roller. Transmitting means for transmitting the rotation of the separation / conveyance roller to the pull-in roller; and a holding member rotatably mounted on the rotation axis of the pull-in roller and the rotation axis of the separation / conveyance roller, for raising and lowering the pull-in roller. A drive lever connected to the holding member and rotating the holding member; an elevating mechanism for swinging the drive lever; A separation conveyance roller and a multiple conveyance prevention roller that rotates in a reverse direction, wherein the pull-in roller, the separation conveyance roller, the holding member, and the transmission unit are formed as an integrated unit, and the unit is configured as the paper feeding unit. A recording medium transporting device detachably attached to a portion, wherein the recording medium transporting device is formed at an end of the holding member opposite to a side to which the pull-in roller is connected, and contacts an inside of an upper wall surface of the paper feeding portion. An image forming apparatus comprising: a projection; and an opening that is perforated in a part of an upper wall surface of the paper feeding unit, and the projection is inserted when the unit is mounted in a normal position. Recording medium transport device.