This application is based upon and claims the benefit of priority from the corresponding Japanese Patent Application No. 2012-168302 filed on Jul. 30, 2012, the entire contents of which are incorporated herein by reference.
The present disclosure relates to image forming apparatuses such as copying machines, printers and facsimile machines.
There are some image forming apparatuses in which an electrostatic latent image is formed on an image carrying member such as a photoconductor drum, the electrostatic latent image is developed with toner and the developed toner image is transferred to a predetermined sheet member. In the image forming apparatus as described above, in general, the photoconductor drum and its peripheral devices are formed into one or a plurality of units, they are designed to be freely removed and thus a maintenance operation, an assembly operation and the like are efficiently performed.
For example, an image forming apparatus is known in which a process unit including a photoconductor stored within a housing and a plurality of development units that develop the latent image of the photoconductor is configured such that the process unit can be removed in a direction intersecting the direction in which recording paper is transported. In this image forming apparatus, the entire process unit including the photoconductor and the development units is removed from the apparatus main body, and thereafter each of the development units can be removed and inserted.
Incidentally, in recent years, medium-sized and large-sized image forming apparatuses have been widely used in general offices, and general users may perform a unit replacement operation. However, in the conventional technology described above, when the development unit needs to be replaced due to the life of the product or a failure, it is necessary to perform a replacement operation in the following replacement order: the entire process unit including the photoconductor drum is first removed, and thereafter the development unit is removed and inserted.
Hence, when an operator who is not familiar with the configuration of the apparatus performs the replacement operation, the operator is confused with which unit needs to be first removed in order to replace a specific unit. As described above, in the maintenance and the operation of dealing with the failure that have been conventionally performed, the unit replacement operation is bothersome, and this disadvantageously causes an increase in downtime, the expansion of an operating area and the like.
The present disclosure is made in view of the foregoing problem; an object of the present disclosure is to provide an image forming apparatus that can easily and efficiently perform a unit replacement operation.
An image forming apparatus according to an aspect of the present disclosure includes a drum unit, a development unit, a stopper, a pressing unit and an interlocking device. The drum unit includes a photoconductor drum. The development unit includes a development roller that develops a toner image on the photoconductor drum. The drum unit and the development unit can be removed from the main body of the apparatus. The stopper is freely moved between a restriction position where the removal of the drum unit is restricted and a restriction release position where the restriction of the removal of the drum unit is released. The pressing unit is freely moved between a pressing position where the development roller is pressed onto the photoconductor drum and a pressing release position where the development roller is separated from the photoconductor drum such that the pressing is released. The interlocking device interlocks the movements of the stopper and the pressing unit.
Other objects of the present disclosure and specific advantages obtained by the present disclosure will be obvious from the description of an embodiment discussed below.
An embodiment of an image forming apparatus according to the present disclosure will be described below with reference to accompanying drawings. In the following description, an XYZ orthogonal coordinate system is set, and the positional relationship between individual members may be discussed with reference to the XYZ orthogonal coordinate system. It is assumed that a predetermined direction within a horizontal plane is an X axis direction, a direction perpendicular to the X axis direction within the horizontal plane is a Y axis direction and a direction (that is, a vertical direction) perpendicular to each of the X axis direction and the Y axis direction is a Z axis direction.
(Schematic Configuration of the Image Forming Apparatus)
The discharge section a is configured such that a sheet (sheet member) having a predetermined image formed is discharged through the transport section e into the discharge section a. The bottom surface of the discharge section a is inclined, and thus it is possible to stack a plurality of ejected sheets with one ends aligned.
The toner storage section b is formed with, for example, the toner container of a black toner (BK), and is configured such that the toner can be supplied to a development unit c2 of the image formation section c.
The image formation section c includes a laser scanning unit c1, the development unit c2, a drum unit c3, a transfer unit c4 and a fixing unit c5.
As with a known laser scanning unit, the laser scanning unit c1 includes: a light beam generator that generates laser light; a polygon mirror that scans the light beam applied from the light beam generator; and a f0 lens that forms, with the light beam scanned by the polygon mirror, an image on a photoconductor drum (image carrying member) 1, which will be described later (all of which are not shown).
The development unit c2 supplies the toner to the photoconductor drum 1 to develop an electrostatic latent image formed on the circumferential surface of the photoconductor drum 1, and includes a development roller 2 that is arranged opposite the circumferential surface of the photoconductor drum 1 in its radial direction.
The drum unit c3 includes the photoconductor drum 1 in which the laser scanning unit c1 is used to produce the electrostatic latent image on the circumferential surface of that, and in which a toner image is formed with the toner supplied from the toner storage section b to the development unit c2.
Around the photoconductor drum 1, a charger 3 that brings its circumferential surface into the charged state, a cleaner 4 that removes the toner left on the circumferential surface after the transfer and the like are arranged opposite the photoconductor drum 1. The charger 3, the cleaner 4 and the like of the present embodiment are formed, together with the photoconductor drum 1, as the drum unit c3, into a removable unit.
The transfer unit c4 includes a transfer roller 5 that is arranged opposite the circumferential surface of the photoconductor drum 1 in its radial direction. The transfer roller 5 is provided so as to press the photoconductor drum 1.
Hence, as the photoconductor drum 1 is driven to rotate, the transfer roller 5 can rotate. When a predetermined sheet member, for example, the sheet, is transported through the transport section e, the transfer roller 5 can be rotated with the sheet interposed between the transfer roller 5 and the photoconductor drum 1, and the sheet can be transported to the side of the fixing unit c5.
The fixing unit c5 is provided in part of the transport section e on the downstream side with respect to the place where the transfer unit c4 is provided, and is formed with a pair of rollers arranged to be able to sandwich the sheet transported along the transport section e. The fixing unit c5 is configured such that the toner image on the sheet transferred with the transfer unit c4 is pressurized and heated with the pair of rollers and thus the toner image can be fixed to the sheet.
The sheet supply section d includes a paper feed tray d1 which is provided to be freely opened and closed with respect to the apparatus main body 10 and a paper feed cassette d2 which is provided to be freely removed from the apparatus main body 10. The sheet supply section d is configured such that the sheets can be supplied one by one from the paper feed tray d1 or the paper feed cassette d2 to the transport section e.
The transport section e is provided to extend from the sheet supply section d located in a lower portion to the discharge section a located in an upper portion, and is formed with a plurality of transport rollers and guide plates. The transport section e is configured such that the sheets supplied from the sheet supply section d can be transported one by one to the discharge section a.
In the copying machine P configured as described above, the laser light corresponding to image data is applied from the laser scanning unit c1 to the photoconductor drum 1 to form the electrostatic latent image, and the toner image is developed with the supplied toner. Then, the toner image carried on the photoconductor drum 1 is transferred to the sheet with the transfer unit c4, and is thereafter fixed by being pressurized and heated with the fixing unit c5. Finally, the sheet on which the image has been printed is ejected to the discharge section a.
(Configuration of the Apparatus Main Body and Individual Units)
As shown in
The drum unit c3 and the development unit c2 each can be removed with an unillustrated guide toward the front side with respect to the apparatus main body 10. Hence, the drum unit c3 and the development unit c2 are removed toward the front side, and thus the photoconductor drum 1, the development roller 2 and part of peripheral members can be removed together from the apparatus main body 10.
The removal of the drum unit e3 is restricted by a stopper 12; when the drum unit c3 is removed, it is necessary to release the restriction by the stopper 12. Since the development roller 2 is arranged close to the photoconductor drum 1 (see
The interlocking device 20 operates an operation member 21 exposed below the development unit c2, and thereby interlocks the removal restriction/release of the drum unit c3 and the development unit c2. The configuration of the interlocking device 20 will be described with reference to
As shown in
The stopper 12 is formed in the shape of the letter L; the stopper 12 is provided freely movably between a restriction position where the removal of the drum unit c3 is restricted as shown in
The development unit c2 is incorporated in the pressing unit 13. The pressing unit 13 includes an engagement portion 14 which incorporates the development unit c2 such that the development unit c2 is freely removed in the same direction (Y axis direction) as the removal direction of the drum unit c3. In the pressing unit 13, the development unit c2 is freely moved between a pressing position where the development roller 2 is pressed onto the photoconductor drum 1 as shown in
As shown in
The transfer roller 5 is provided so as to be freely moved between a second pressing position where the transfer roller 5 is pressed onto the photoconductor drum 1 as shown in
The transfer unit c4 having the transfer roller 5 includes lever members 18 that engage with the shaft 5a of the transfer roller 5. The lever member 18 includes a rotation shaft (second shaft) 19. Hence, the transfer roller 5 is freely rotated about the rotation shaft 19 that extends in the removal direction (Y axis direction).
The interlocking device 20 interlocks the movements of the stopper 12 and the pressing unit 13 and furthermore the transfer roller 5. The interlocking device 20 includes the operation member 21 that is freely moved between: the first position (see
The operation member 21 includes: a first member 22 that can be removed from the apparatus main body 10; the second members 23 that rotate the pressing unit 13 about the rotation shaft 15 in coordination with the first member 22; third members 24 that rotate the transfer roller 5 about the rotation shaft 19 in coordination with the second members 23; and the slide unit 25 that slides the stopper 12 in coordination with the third members 24.
As shown in
The first member 22 has grooves 27 that extend in a direction intersecting a movement direction (Y axis direction). The grooves 27 are provided in the front side (+Y side) and the back side (−Y side) parallel to each other. As the groove 27 extends to the back side, it extends to the left side (−X side).
The second members 23 are provided as a pair in the front side (+Y side) and the back side (−Y side) of the first member 22 parallel to each other. As shown in
Hence, as the first member 22 is removed to +Y side as shown in
The second members 23 include shafts 30 that are interlocked with the first member 22 to rotate the pressing unit 13 about the rotation shaft 15. The shaft 30 is provided so as to extend in the Y axis direction. As shown in
When the operation member 21 is located in the first position, as shown in
As shown in
The third member 24 is a bar-shaped member that extends in a vertical direction (Z axis direction). The third members 24 are provided, according to the second members 23, as a pair, in the front side (+Y side) and the back side (−Y side) parallel to each other.
As shown in
As shown in
When the operation member 21 is located in the first position, as shown in
Specifically, when the second member 23 is moved to −X side, the support roller 32 is rotated to move the lower end of the third member 24, and the supporting position is moved from the flat surface portion 33a through the inclination surface portion 33b to the recess portion 33c. Then, the third member 24 is moved to +Z side, the upper end of the third member 24 presses up the contact portion 34, the transfer roller 5 is rotated together with the lever members 18 about the rotation shaft 19, and the transfer roller 5 is separated from the photoconductor drum 1, with the result that the pressed state is released.
As shown in
The groove 35 extends in a direction interesting the direction (Z axis direction) in which the third member 24 is moved. As the groove 35 extends to +Z side, it extends to −X side. The pin 36 is provided to stand from the stopper 12 to −Y side, and is arranged in the groove 35. Hence, as the third member 24 is pressed up to +Z side, the pin 36 slides along the groove 35, and the stopper 12 is interlocked with the third member 24 to be moved to +X side.
On the contrary, as the third member 24 is pressed down to −Z side, the pin 36 slides along the groove 35, and the stopper 12 is interlocked with the third member 24 to be moved to −X side (see
A unit replacement operation in the copying machine P configured as described above will now be described.
When the drum unit c3 and the development unit c2 are removed from the apparatus main body 10, an operator first opens the cover 11 provided on the front side of the apparatus main body 10 as shown in
Then, the operator moves the operation member 21 from the first position to the second position. Specifically, while the operator is holding the holding portion 26 of the first member 22, the operator removes it to the front side (+Y side) of the apparatus main body 10. When the first member 22 is removed, and the operation member 21 is moved from the first position to the second position, the drum unit c3 and the development unit c2 are freely removed from the apparatus main body 10.
More specifically, when the first member 22 is removed, as shown in
When the second member 23 is moved to −X side, the support roller 32 is rotated to move the lower end of the third member 24, and supports the recess portion 33c. When the recess portion 33c is supported, the third member 24 is moved to +Z side, and the upper end of the third member 24 presses up the contact portion 34. When the contact portion 34 is pressed up, the lever member 18 is rotated about the rotation shaft 19, and the transfer roller 5 is separated from the photoconductor drum 1 against the force applied by the pressing spring 17 (the second pressing release position).
When the third member 24 is moved to +Z side, the pin 36 engaging with the groove 35 slides to +X side. Thus, the stopper 12 is moved to +X side (the release position).
As described above, with the interlocking device 20 of the present embodiment, by moving the operation member 21 to the second position, it is possible to simultaneously perform the release of the stopper 12 on the drum unit c3, the pressing release of the development roller 2 onto the photoconductor drum 1 and the pressing release of the transfer roller 5 onto the photoconductor drum 1.
Hence, as shown in
As described above, in the present embodiment, it is possible to prevent the order of removal of the drum unit c3 and the development unit c2 from being restricted, and to make the unit replacement operation intuitively and easily understood. In the present embodiment, since the pressing release of the transfer roller 5 onto the photoconductor drum 1 is simultaneously performed, for example, it is possible to remove the drum unit c3, for example, without opening and closing the transport cover in the lateral direction of the apparatus main body 10 so as to release the pressing of the transfer roller 5. As described above, the operator can simultaneously move the stopper 12, the pressing unit 13 and the transfer roller 5 by performing an easy and intuitive operation with one operation member 21, and thus it is possible to easily and efficiently perform the unit replacement operation.
On the other hand, when the drum unit c3 and the development unit c2 are fitted into the apparatus main body 10 after maintenance, the operator locates the operation member 21 in the second position, and inserts the drum unit c3 and the development unit c2 into the apparatus main body 10 in the Y axis direction. When the operation member 21 is located in the first position, since the stopper 12 is located in the restriction position, it is possible to prevent the drum unit c3 from being erroneously fitted.
After the insertion of the units, the operator moves the operation member 21 from the second position to the first position. Specifically, while the operator is holding the holding portion 26 of the first member 22, the operator presses it to the back side (−Y side) of the apparatus main body 10. When the first member 22 is pressed thereto, as shown in
When the second member 23 is moved to +X side, the support roller 32 is rotated to move the lower end of the third member 24, and supports the recess portion 33c. When the recess portion 33c is supported, the third member 24 is moved to −Z side, and the pressing up of the contact portion 34 by the upper end of the third member 24 is released. When the pressing up of the contact portion 34 is released, the lever member 18 is rotated about the rotation shaft 19, and the transfer roller 5 is close to the photoconductor drum 1 by the force applied by the pressing spring 17 (the second pressing position).
When the third member 24 is moved to −Z side, the pin 36 engaging with the groove 35 slides to −X side. Thus, the stopper 12 is moved to −X side (the release position).
As described above, when the operation member 21 is moved from the second position to the first position, the restoring force applied by the pressing springs 16 and 17 is utilized, and thus it is possible to return the development roller 2 and the transfer roller 5 to the original positions located with respect to the photoconductor drum 1. Thus, with the interlocking device 20 of the present embodiment, by moving the operation member 21 to the first position, it is possible to simultaneously perform the restriction of the stopper 12 on the drum unit c3, the pressing of the development roller 2 onto the photoconductor drum 1 and the pressing of the transfer roller 5 onto the photoconductor drum 1, with the result that it is possible to perform the unit replacement operation by the simple and intuitive operation of the one operation member 21.
Hence, according to the present embodiment, the copying machine P is provided in which the drum unit c3 having the photoconductor drum 1 and the development unit c2 having the development roller 2 developing the toner image on the photoconductor drum 1 can be removed from the apparatus main body 10, the copying machine P including: the stopper 12 that is freely moved between the restriction position where the removal of the drum unit c3 is restricted and the release position where the restriction of the removal of the drum unit c3 is released; the pressing unit 13 that is freely moved between the pressing position where the development roller 2 is pressed onto the photoconductor drum 1 and the pressing release position where the development roller 2 is separated from the photoconductor drum 1 such that the pressing is released; and the interlocking device 20 that interlocks the movements of the stopper 12 and the pressing unit 13. With this configuration, it is possible to obtain the copying machine P that can easily and efficiently perform the unit replacement operation and that can realize the reduction in downtime and in the operation area.
Although the preferred embodiment of the present disclosure has been described above with reference to the accompanying drawings, the present disclosure is not limited to the above embodiment. The constituent members, the shapes, the combinations and the like described in the above embodiment are illustrative; various modifications are possible without departing from the spirit of the present disclosure based on design requirements and the like.
For example, although in the above embodiment, the copying machine has been illustrated as the image forming apparatus, the present disclosure can be applied to, for example, image forming apparatuses such as printers and facsimile machines.
Number | Date | Country | Kind |
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2012-168302 | Jul 2012 | JP | national |
Number | Name | Date | Kind |
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20070189804 | Yasumitsu | Aug 2007 | A1 |
Number | Date | Country |
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U-S62-149046 | Sep 1987 | JP |
01101561 | Apr 1989 | JP |
2002-278424 | Sep 2002 | JP |
2004258693 | Sep 2004 | JP |
2005-157187 | Jun 2005 | JP |
Entry |
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English Abstract and Translation for JP 2002-278424 A, published Sep. 27, 2002. |
English language Abstract and Machine Translation for JP U-S62-149046 A, published Sep. 21, 1987. |
English language Abstract and Machine Translation for JP 2005-157187 A, published Jun. 16, 2005. |
Number | Date | Country | |
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20140029979 A1 | Jan 2014 | US |