JP2001270626A - Recording medium separating and carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify work for replacing a separating and carrying roller unit in a shorter time. SOLUTION: The roller unit is locked and held as well by the rotational movement and attachment/detachment of a recording medium carrying guide member 22 near a separating and carrying roller 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium separating / conveying apparatus, and more particularly, to a method for preventing a separating / conveying roller for conveying a recording medium from being conveyed by a conveying guide member of an image forming apparatus.

[0002]

2. Description of the Related Art FIG. 7 is a schematic diagram of a conventional image forming apparatus, and FIG. 8 is a configuration diagram of a conventional image forming apparatus. In FIG. 7, reference numeral 5 denotes a photoreceptor which is made of aluminum or the like and has a photoreceptive layer applied on its outer peripheral surface in a thin film shape and rotates in the direction of arrow A, and 6 is disposed in proximity to the photoreceptor 5 A charger for charging the photoreceptor 5, a laser beam 7 for irradiating the charged photoreceptor 5 to form an electrostatic latent image, and 8 for visualizing the electrostatic latent image formed on the photoreceptor 5 with toner Developing device, 9 is developing device 8
Is a transfer unit that transfers the toner image visualized by the printer to the recording medium 4.

[0003] Next, 1 moves in the direction of arrow B to separate from and contact the uppermost recording medium 4 of the stacked recording media 4, and to contact the recording medium 4 to cause the uppermost recording medium to be stacked. It is rotatably attached to the shaft 14 by a pull-in roller for conveying. Reference numeral 2 denotes a separation / conveyance roller for separating / conveying the recording medium 4 conveyed by the pull-in roller 1, which is fixed to a rotating shaft 13 provided on the image forming apparatus main body 12. Reference numeral 11 denotes a holding member which is provided with a shaft 14 and is attached to the rotating shaft 13 via a rotatable member. Reference numeral 3 denotes a multiple conveyance preventing roller which presses against the separation conveyance roller 2 and rotates in a direction opposite to the separation conveyance roller 2. is there.

[0004] First, the operation of the image forming apparatus using the conventional recording medium separating and conveying apparatus configured as described above will be described. The photoconductor 5 rotating in the direction of arrow A is uniformly charged by the charger 6, and the charged photoconductor 5 is irradiated with the laser beam 7 to form an electrostatic latent image. Then, the electrostatic latent image is visualized by toner in the developing device 8, and the visualized toner image is transferred to the recording medium 4 by the transfer unit 9.

Next, the operation of the recording medium separating and conveying apparatus will be described. The rotating shaft 13 is the image forming apparatus main body 12
The separation / conveyance roller 2 also rotates with the rotation of the rotating shaft 13. Further, the rotation of the separation / conveyance roller 2 causes the pull-in roller 1 to rotate via the drive transmission gear.

In this state, the holding member 11 is rotated in the direction of arrow B by the elevating mechanism, and with the rotation of the holding member 11, the pull-in roller 1 comes into contact with the uppermost portion of the stacked recording medium 4 and the uppermost portion. Recording medium 4 is conveyed between the multi-conveying prevention roller 3 and the uppermost one recording medium 4 is conveyed between the photoreceptor 5 and the transfer means 9 by the separating and conveying roller 2. The second and subsequent recording media are prevented from being transported by the multiple transport prevention roller 3.

[0007]

However, in the above-described conventional configuration (FIG. 8), the separation / conveyance roller 2 is not
When the consumable parts are to be replaced because the separation / conveyance roller 2 has reached the end of its life due to the separation / conveyance of the recording medium 4, the roller fixing member must be removed in an unreasonable posture after being fixed to the rotating shaft 13 provided in the recording medium 4. Has to be exchanged, which leads to the problem of consuming work time and losing the fixing member.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a method for preventing a separation / conveying roller from slipping out and holding the same so that the operation can be simplified and the time can be greatly reduced.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to prevent a separation conveyance roller from coming off and to hold by rotating and detaching a conveyance guide member provided around the separation conveyance roller. With this configuration, it is possible to obtain a transport device that can simplify the operation of replacing the separation transport roller and shorten the operation time.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a pull-in roller which is separated from and connected to an uppermost portion of a laminated recording medium and transports the laminated uppermost recording medium, and is transported by a pull-in roller. A separation roller unit that integrally integrates a separation conveyance roller that separates and conveys the separated recording medium, and a transmission unit that transmits the rotational force of the separation conveyance roller to the pull-in roller. A holding portion for holding freely is provided. With this configuration, both the pull-in roller and the separation conveyance roller are provided on the roller support member. Therefore, these two rollers are merely separated from the separation conveyance roller from the shaft. And can be replaced together with the roller supporting member.

According to a second aspect of the present invention, a pull-in roller rotates a conveyance guide member provided to smoothly convey an uppermost recording medium between multiple conveyance prevention rollers which press against a separation conveyance roller. Claim 1 by attaching and detaching
This makes it possible to prevent the separation / conveyance roller unit from falling off and to hold it, which has the effect of simplifying the roller unit replacement operation and shortening the operation time.

Hereinafter, embodiments of the present invention will be described.

FIG. 1 is a schematic diagram of an embodiment of the present invention. FIG. 2 is a configuration diagram of the sheet feeding unit. FIG.
Is a schematic plan view, and FIGS. 4, 5, and 6 are schematic front views. The description will be given below with reference to these drawings. Here, the same components as those of the conventional technology are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 1, reference numeral 17 denotes a supporting rotary shaft which is rotationally driven by a rotational driving force from a driving source (not shown) provided in the main body of the image forming apparatus, and 16 denotes both rollers of the pull-in roller 1 and the separation transport roller 2. The roller support member rotatably holds and supports a frame of a separation / conveyance roller unit (described later). Reference numeral 18 in FIG. 3 denotes a transmission belt that is stretched between the shafts of both the pull-in roller 1 and the separation / conveyance roller 2 to transmit the rotational driving force of the support rotation shaft 17 to the rotation shaft of the pull-in roller 1. Roller 1, separation / conveyance roller 2, roller support member 16, transmission belt 18
And a detachable transport roller unit having a detachable structure in which the bearing 2a of the separate transport roller 2 is inserted into the support rotation shaft 17. Here, the bearing 2a is constituted by a one-way clutch.

Next, the operation of the thus-assembled recording medium separating / conveying apparatus will be described.

The separation / conveyance roller unit 20 is mounted on the support rotating shaft 17 by sliding in the direction of arrow C in FIG. At this time, the multiple conveyance prevention roller 3 that is in pressure contact with the separation / conveyance roller 2 is configured to be separated from the separation / conveyance roller 2 by separation / contact means (not shown).

Here, in FIG. 3, FIG. 4, and FIG. 5, the separation conveyance roller 2 and the multiple conveyance prevention roller
The transport guide member 22 provided for smoothly transporting the recording medium 4 during the rotation is freely rotatable by a structure supported by a paper feed housing 21 with a pair of rotation shafts. By rotating the conveyance guide member 22 upward as shown in FIG. 5, the separation conveyance roller unit 20 can be pulled out in the C direction.
Further, as shown in FIG. 4, by rotating the conveyance guide member 22 downward, the separation conveyance roller unit 20 is fixed so as not to come off (slid in the axial direction) due to the contact of the side surface thereof. Alternatively, as shown in FIG. 6, the transport guide member 22 can be attached to and detached from the paper feed casing 21 by utilizing the elasticity of the transport guide member 22 so that the separation transport roller unit 20 is provided.
Can be inserted and removed and fixed. In this state, when the support rotation shaft 17 is rotationally driven by a motor provided in the main body of the image forming apparatus, the separation / conveyance roller 2 rotates in only one direction by the bearing 2a. On the same axis as the bearing 2a of the separation / conveyance roller 2, there are gears that engage with the transmission belt 18, and by these engagements, the rotation of the separation / conveyance roller 2 is transmitted to the pull-in roller 1 shaft by the transmission belt 18. In this state, the separation roller unit 20 is moved in the direction of arrow B in FIG.
, And with the rotation of the holding member 16, the pull-in roller 1 contacts the uppermost portion of the stacked recording media 4, and the uppermost recording medium 4 is pressed against the separation / conveyance roller 2 to prevent multiple conveyance. The uppermost recording medium 4 is conveyed between the photoconductor 5 and the transfer means 9 by the separation / conveyance roller 2, and the second and subsequent recording media The transport is prevented by the multiple transport prevention roller 3.

[0018]

As described above, according to the present invention, it is possible to simplify the exchange work of the separation conveyance roller and shorten the operation time by rotating and detaching the conveyance guide member which also serves to prevent and hold the separation roller unit. An effect can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram according to an embodiment of the present invention.

FIG. 3 is a schematic plan view of an embodiment of the present invention.

FIG. 4 is a schematic front view of an embodiment of the present invention.

FIG. 5 is a schematic front view of an embodiment of the present invention.

FIG. 6 is a schematic front view of the embodiment of the present invention.

FIG. 7 is a schematic diagram of a conventional image forming apparatus.

FIG. 8 is a configuration diagram of a conventional image forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pull-in roller 2 Separation conveyance roller 3 Multiple conveyance prevention roller 4 Recording medium 5 Photoconductor 6 Charger 7 Laser beam 8 Developing device 9 Transfer device 10 Cleaning 11 Holding member 12 Transport guide member 13 Rotating shaft 14 Fixed shaft 16 Roller support member 17 Support rotation shaft 18 Drive belt 19 Fixing device 20 Separation and conveyance roller unit 21 Paper feed housing 22 Transport guide member 23 Roller fixing member

Continued on the front page F term (reference) 3F343 FA02 FB01 FC22 HD08 HD16 JA19 JD09 JD33 JD40 KA03 KA13 KA20 KB05 KB13 LA04 LA13 LC15 LC17

Claims (2)

[Claims] A pull-in roller that moves in and out of contact with an uppermost portion of the stacked recording media and conveys the stacked uppermost recording medium; a separation-conveying roller that separates and conveys the recording medium conveyed by the pull-in roller; A separating / conveying roller unit integrally configured with a transmission unit for transmitting the rotational force of the separating / conveying roller to the pull-in roller; and a holding unit for detachably holding the separating / conveying roller unit on a sheet feeding unit. A recording medium separating and conveying device characterized by the above-mentioned. 2. A conveying guide member provided for the pull-in roller to smoothly convey the uppermost recording medium between the multi-conveying prevention rollers pressed against the separation conveying roller, and
A conveyance guide member, which is detachably attached to the separation conveyance roller unit to prevent the separation conveyance roller unit from falling off and to hold the separation conveyance roller unit.