JPH04305674A - Curling device for transfer material and copying machine - Google Patents

Abstract

PURPOSE:To surely form a curl to improve adhesive strength of the transfer material against a transferring body and to make a constitution which is simple and low cost. CONSTITUTION:When a transfer paper P is inserted into an insertion guide part 26 from an opening 25 of a guide part 28, the transfer paper P is guided by the insertion guide part 26 so that its edge part is entered into a deformed guide part 27 which consists of a curved path. The edge part of the transfer paper P is curled by the deformed guide part 27. After this, the transfer paper P with curl pulled out from the insertion guide part 26 is housed in a paper feeding cassette 22. If it is fed to the transfer drum 3, since the transfer paper is curled, the transfer paper P is stuck along the outer periphery of a transfer drum 3.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applied to a transfer material supply device of an image forming apparatus such as a printer or a copying machine, and is used to curl the transfer material to improve the adhesion of the transfer material to the transfer body. The present invention relates to a curling device and a copying apparatus using this transfer material curling device.

0002

2. Description of the Related Art Conventionally, in an electrostatic image forming method, in the process of transferring an image to a transfer material, as shown in FIGS. When the transfer paper P is mounted on the transfer drum 3, for example, if the transfer paper P is thick like a postcard or short, the leading edge is gripped by a gripper 3a as shown in FIG. Therefore, there is no problem, but since the rear end is not attached tightly to the outer periphery of the transfer drum 3, the leading edge may come off the gripper 3a during transfer, or the image may be transferred unevenly, resulting in color shift in color images. I had a problem.

[0003] Therefore, a sheet with strong electrostatic adsorption force is pasted to the rear end of the transfer paper to improve the adhesion of the paper to the transfer drum. A configuration has been proposed in which a large number of rollers are installed around a drum to correct the wrapping of transfer paper.

0004

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, although the sheet having strong electrostatic adsorption force is improved, the adhesion to the transfer drum is improved.
It is necessary to affix and remove a sheet for each sheet of transfer paper, resulting in poor workability. Further, in the case where a large number of rollers are installed, a cleaning device for the rollers is also required in order to maintain the image quality, resulting in a complicated structure and an increase in cost.

An object of the present invention is to provide a transfer material curling device that can reliably form a curl on the transfer material to improve the adhesion of wrapping it around a transfer body, and that has a simple and inexpensive configuration. The purpose of this invention is to provide a copying device.

[0006]

[Means for Solving the Problems] The above object is to guide the transfer material before feeding it into a transfer material supply means that feeds the transfer material to a transfer body for transferring an image onto the transfer material. In a transfer material curling device that forms a curl at the end of the transfer material to improve the adhesion of wrapping the material to the transfer body, the guide body includes a deformable guide portion for forming the curl at the end of the transfer material. This is achieved by a configuration in which an insertion guide portion that does not deform the transfer material is provided, and a groove is formed in the insertion guide portion into which a means for inserting and removing the transfer material is inserted. This can also be achieved by a configuration in which a transfer material insertion position regulating means for regulating the degree of insertion of the transfer material is provided in the groove portion, and the transfer material insertion position regulating means is arranged in the direction of insertion of the transfer material. This can also be achieved by a movable configuration. Further, the above object is achieved by a copying apparatus in which the transfer material curling device is installed outside the copying device main body, and furthermore, the transfer material curling device is provided inside the copying device main body, and the transfer material This can also be achieved by providing an opening in the main body of the copying apparatus at a position corresponding to the opening of the curling device so that the transfer material can be taken in and taken out from the outside.

[0007]

[Operation] In the above transfer material curling device, the transfer material inserted from the insertion guide section is curled at the end by the deformation guide section, and then pulled out from the insertion guide section and stored in the transfer material supply means. The curling improves the winding adhesion of the transfer material to the transfer member. In addition, by providing a groove in the insertion guide section into which a means for inserting and removing the transfer material can be inserted, the transfer material can be reliably inserted to the deformation guide section without unnecessary deformation. It also makes withdrawal easier. Further, by changing the degree of insertion of the transfer material into the deformation guide section by the transfer material insertion position regulating means, the degree of curling of the transfer material in the deformation guide section is adjusted. In addition, in the above-mentioned copying machine, the transfer material curling device can be removed from the copying machine main body or used with it attached, allowing the operator to easily perform curling operations in a user-friendly state. By providing the device inside the main body of the copying apparatus, the transfer material curling device does not interfere with copying operations or transporting the device.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram of an electrophotographic color copying machine using a first embodiment of the present invention, and the basic electrophotographic process is the same as that of a known one.

That is, this copying machine 1 includes a photosensitive drum 2 that is rotatable in the direction of the arrow shown in the exterior cover 1a of the main body of the copying machine, and a photosensitive drum 2 that approaches the photosensitive drum 2 in the same direction and at the same speed as the drum 2. A movable transfer drum 3 is provided, an exposure section 5 is located above the photosensitive drum 2, and a front charging section 6, a developing section 7, an erase section 8, a cleaning section 9, etc. are located around the drum 2. On the other hand, a transfer section 10 is disposed inside the transfer drum 3 at a portion facing the photosensitive drum 2, and a paper feed section 11 is disposed in front of the transfer section 10 in the rotational direction of the transfer drum 3.
However, a separation section 12 is located behind the transfer section 10 in the rotational direction of the transfer drum 3.

In the exposure section 5, an optical system including a light source and a plurality of reflecting mirrors reciprocates in the scanning direction with respect to the document table 14 made of a transparent body fixed to the upper surface of the main body. With this configuration, exposure scanning is performed on the document on the document table 14 a plurality of times, and during each scan, the reflection from the document is color-separated by the filter 15 and guided onto the photosensitive drum 2 .

The front charging section 6 is located in front of the exposure position in the rotational direction of the photoreceptor drum 2, and uniformly charges the photoconductive layer of the photoreceptor drum 2 with a preset polarity. .

On the other hand, the developing section 7 is located behind the exposure light irradiation position in the rotational direction of the photosensitive drum 2, and develops cyan and magenta, which are complementary colors of the three primary colors separated by the filter 15 in the exposure section. , yellow, and a developer tank containing a black developer are installed near the outer periphery of the photoreceptor drum 2.

Furthermore, in order to remove the developer adhering to the non-image area on the photoreceptor drum 2 after development, the erase portion 8 is provided with an amount of light that can remove the charge remaining on the background portion of the photoreceptor drum 2. It is designed to emit light.

The cleaning section 9 is located behind the position facing the transfer drum 3 in the rotational direction of the photoreceptor drum 2, and removes electrical charge between the charge on the photoreceptor drum 2 and the electric charge by a static eliminating charger. The residual developer on the photoreceptor drum 2 in which the sum state has been set is removed by a cleaning roller having a structure similar to the above-described developing sleeve, and the residual charge on the photoreceptor drum 2 is removed by a quenching lamp. do.

On the other hand, the transfer portion 10 of the transfer drum 3 is provided with a charged portion facing the photoreceptor drum 2 with the peripheral wall of the transfer drum 3 in between, inside the transfer drum 3 which is provided so as to be able to approach and separate from the photoreceptor drum 2. a transfer drum 3;
When the developer approaches the photosensitive drum 2 during transfer, it is charged with a polarity opposite to that of the developer. A paper feed section 11 is located in front of the transfer section 10 in the rotational direction of the transfer drum 3.

The separation section 12 includes a swingable separation claw located at the rear of the transfer section 10 in the rotational direction of the transfer drum 3, and a swingable separation claw located at the rear of the transfer section 10 in the rotational direction of the transfer drum 3, and a swingable separation claw in the moving direction of the paper separated from the transfer drum 3 by the separation claw. It has a conveyor belt and a separation charger located behind the separation claw, and conveys the separated paper from above the transfer drum 3 to the fixing device 16. The fixing device 16 includes a heating roller and a pressure roller that comes into contact with the heating roller and rotates as a result of rotation.The fixing device 16 thermally fixes the image on the paper while nipping and conveying the paper, and then discharges the paper.

The paper feed section 11 includes a plurality of transport rollers 20, a guide plate 21, paper feed cassettes (two in this example) 22 constituting a transfer material supply means, and a plurality of paper feed cassettes 22 installed in each paper feed cassette 22. The paper feeding cassette 22 has a feed roller 23, and a guide body 24, which is a transfer material curling device to be described later, and which is installed on the side of the paper feed cassette 22.

FIG. 2 is a perspective view of a main part of the guide body shown in FIG. 1, and FIG. 3 is a sectional view of the entire guide body shown in FIG. 25, an insertion guide section 26 consisting of a horizontal path that does not deform the transfer paper P, and a deformation guide that forms a curl C at the end of the transfer paper P, consisting of a curved path following this insertion guide section 26. Part 2
7, and a reciprocating roller 29 installed at a position facing the opening 25 for inserting and pulling out the transfer paper P.

The guide body 24 has the following functions with respect to the transfer paper P:
In order to improve the adhesion of wrapping around the transfer drum 3,
It is used when forming a curl C at the edge of the transfer paper. For example, when the transfer paper P that needs to be curled, such as cardboard or postcard, is inserted through the reciprocating roller 29, the reciprocating roller 29
9, the transfer paper P is bent by the insertion guide part 26 from the opening 25 and inserted into the deformation guide part 27 while being guided so as not to cause deformation such as buckling. After insertion,
By reversing the reciprocating roller 29, the transfer paper P is pulled out to the outside, and as shown in FIG. will be attached.

The curled transfer paper P is stored in the paper feed cassette 22 and fed as shown in the explanatory diagram of FIG. As shown, the leading end is gripped by the gripper 3a, and the trailing end with the curl C comes into close contact with the outer periphery of the transfer drum 3, and is transferred by the photosensitive drum 2.

Note that the transfer paper P is inserted into the opening 25 of the guide body 24.
The reciprocating roller 29 may not be used to move it in and out, but it can be done manually by the operator. In this case, by pinching the leading end of the transfer paper P and moving the rear end of the transfer paper P in and out of the opening 25, the rear end is curled.

FIG. 7 is a perspective view showing a second embodiment of the guide section, and FIG. 8 is a cross-sectional view of the guide section shown in FIG. A groove 30 is formed that widens toward the groove 30, and a plate-shaped stopper 31 is provided at the back of the groove 30 as a transfer material insertion position regulating means movable in the transfer paper insertion direction (arrow X direction).

The stoppers 31 are provided on both sides of the upper and lower insertion guide portions 26, or on at least one of them. Furthermore, various installation structures can be considered for the insertion guide part 26, but in this example, a screw 34 fixed to the insertion guide part 26 is inserted into a long hole 33 provided in the stopper 31.
The figure shows a structure in which the parts are held in a loosely fitted manner.

In the guide body 24 of the second embodiment, the operation of curling the end of the transfer paper P is the same as that of the first embodiment, but the reciprocating motion, which is a means for taking in and out the transfer paper P, Since the roller 29 or the operator's finger during manual operation can be inserted into the groove 30, the transfer paper P is inserted up to the deformation guide portion 27 while being held by the reciprocating roller 29 or the operator's finger, thereby preventing buckling of the transfer paper P. etc., allowing smooth insertion and withdrawal.

Furthermore, by regulating the insertion position (insertion degree) of the transfer paper P into the deformation guide portion 27 using the stopper 31, it is possible to regulate the curling position of the transfer paper, which varies depending on the paper quality. The regulation of this insertion position is shown in Figure 9.
As shown in the perspective view of the main part of the third embodiment of the guide section shown in FIG. . In FIG. 9, a thin paper mark 32a and a thick paper mark 32b are shown.
is formed.

FIG. 10 is a sectional view of a main part showing an example of installation of the above-mentioned transfer material curling device, and shows the above-mentioned guide body 24.
A clip body 40, which is an engaging member, is provided on the back side of the
The copying machine has a structure in which a frame body 41, which is a locking member that can be detachably engaged with the clip body 40, is provided on the outside of an outer cover la, which is the main body of the copying machine. By providing an arbitrary number of the frame bodies 41 at arbitrary locations on the exterior cover 1a, the guide bodies 24 can be arranged in accordance with the operating conditions of the operator and the installation conditions of the copying machine.
(For example, the frame bodies 41 are provided at two locations on the left and right of the front surface of the operation unit for right-handed and left-handed users.) Further, the curling of the transfer paper P can be performed with the guide body 24 still installed on the exterior cover 1a or with the guide body 24 removed.

FIG. 11 is a cross-sectional view of the main parts showing another example of installation of the transfer material curling device, in which the guide body 24 explained in FIGS. 25
A locking protrusion 4 whose lower part is provided inside the outer cover 1a
2, and the opening 2 in the exterior cover 1a.
It has a configuration in which a port 43 is bored at a location corresponding to 5. This port 43 is provided, for example, on the front surface of the operating section or on the side surface of the paper feed cassette. Therefore, by putting the transfer paper P in and out of the exterior cover 1a through the port 43,
Curling is performed by the guide body 24. Since the guide body 24 does not protrude outward from the exterior cover 1a, it does not get in the way during copying operations or transportation.

[0028]

As explained above, according to the invention as set forth in claim 1, the transfer material is easily and reliably curled at the end by the deformation guide section having a simple structure, so that the transfer material is According to the invention of claim 2, the adhesion of
Since a means for inserting and removing the transfer material can be provided in the groove of the insertion guide section, the transfer material can be inserted and removed reliably.
Further, according to the third and fourth aspects of the invention, by providing a transfer material insertion position regulating means, it is possible to provide a transfer material curling device that can adjust the degree of curling of the transfer material. Further, according to the invention set forth in claim 5, the transfer material curling device can be used in various conditions, and the curling operation is simplified, and further, according to the invention set forth in claim 6,
Since the transfer material curling device does not protrude to the outside, it is possible to provide a copying device that can prevent the transfer material curling device from interfering with copying operations and transportation. Both have a simple configuration, are inexpensive, and can provide a transfer material curling device and a copying device that can improve the adhesion of the transfer material to the transfer body.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram schematically showing a copying machine using a first embodiment of a transfer material curling device of the present invention.

FIG. 2 is a perspective view of essential parts of the guide body in FIG. 1;

FIG. 3 is an overall sectional view of the guide body in FIG. 1;

FIG. 4 is a perspective view of the transfer paper in a curled state.

FIG. 5 is an explanatory diagram showing a storage state of transfer paper.

FIG. 6 is an explanatory diagram showing a state in which transfer paper is in close contact with a transfer drum.

FIG. 7 is a perspective view of a second embodiment of the guide section.

FIG. 8 is a cross-sectional view of the guide portion of FIG. 7;

FIG. 9 is a perspective view of main parts of a third embodiment of the guide section.

FIG. 10 is a sectional view of essential parts showing an installation example of a transfer material curling device.

FIG. 11 is a sectional view of a main part showing another installation example of a transfer material curling device.

FIG. 12 is an explanatory diagram showing a state in which transfer paper is in close contact with a conventional transfer drum.

[Explanation of symbols]

1 Copying machine 1a Exterior cover (copying device main body) 3 Transfer body 22 Transfer material supply means 24 Transfer material curling device (guide body) 25 Opening 26 Insertion guide section 27 Deformation guide section 28 Guide section 29 For taking in and out of transfer paper means (reciprocating roller) 30 Grooves 31, 32 Transfer material insertion position regulating means 40 Clip body 41 Frame body 43 Port P Transfer material

Claims (6)

[Claims] Claim 1: Before putting the transfer material into a transfer material supplying means that feeds the transfer material to the transfer body in order to transfer an image to the transfer material, the transfer material is guided and an end portion of the transfer material is placed on the transfer body. In a transfer material curling device that forms a curl to improve wrapping adhesion, the guide body includes a deformable guide portion for forming the curl at the end of the transfer material, and a deformation guide portion that does not deform the transfer material. A transfer material curling device comprising an insertion guide section. 2. The transfer material curling device according to claim 1, wherein a groove is formed in the insertion guide portion into which means for inserting and removing the transfer material is inserted. 3. The transfer material curling device according to claim 2, wherein said groove portion is provided with a transfer material insertion position regulating means for regulating the degree of insertion of the transfer material. 4. The transfer material curling device according to claim 3, wherein the transfer material insertion position regulating means is movable in the transfer material insertion direction. 5. A copying apparatus, wherein the transfer material curling device according to claim 1 is installed outside a main body of the copying apparatus. 6. The transfer material curling device according to claim 1 is provided inside a copying device main body, and the transfer material is inserted from the outside into the copying device main body at a position corresponding to the opening of the transfer material curling device. A copying device characterized in that it is provided with an opening.