JP4596799B2 - Image forming apparatus cleaning device - Google Patents

Description

  The present invention relates to a cleaning device, and more particularly to a cleaning device for an image forming apparatus for removing and collecting a transfer residual toner on the surface of a photosensitive drum.

  The image forming apparatus mainly includes an image reading device and a printing device. The image reading device is for reading image information of a document, and the printing device is for forming an image on a transfer material such as paper according to the image information read by the image reading device. The printing apparatus includes an image forming unit and a transfer material conveyance unit that conveys a transfer material. The image forming unit mainly includes a photosensitive drum, a charger, an exposure device, a developing device, and a cleaning device. In this image forming unit, first, the charger charges the surface of the photosensitive drum. The exposure device exposes the surface of the photosensitive drum charged by the charger in accordance with the image information read by the image reading device. Thereby, an electrostatic latent image is formed on the surface of the photosensitive drum. Next, in the developing device, the developing roller causes the toner to adhere to the electrostatic latent image on the surface of the photosensitive drum. Finally, the toner image formed on the surface of the photosensitive drum is transferred to the paper transported by the transfer material transport unit.

  At this time, the cleaning device can remove and collect the transfer residual toner on the surface of the photosensitive drum. This cleaning device mainly includes a housing, a cleaning blade, and a pair of side seal portions. The housing has a collection unit capable of collecting the transfer residual toner. The cleaning blade is attached to the housing along the surface of the photosensitive drum, and removes transfer residual toner on the surface of the photosensitive drum by slidingly contacting the photosensitive drum. The pair of side seal portions are attached to the housing so as to be able to abut on the respective side surfaces in the axial direction at both ends of the cleaning blade. The pair of side seal portions are in contact with the respective surfaces of both ends of the photosensitive drum, and prevent the transfer residual toner from leaking out of the housing from both axial sides of the photosensitive drum. As described in Patent Document 1, the distance between the surfaces of the pair of side seal portions facing each other is smaller than the longitudinal length of the cleaning blade. As a result, when the cleaning blade is mounted on the housing, both end portions of the cleaning blade are in a state of being bitten into mutually facing surfaces of the pair of side seal portions, and between the both end portions of the cleaning blade and the pair of side seal portions. There are no gaps. An example of such a pair of side seal portions is shown in FIG.

As shown in FIG. 7, the side seal portion 162 is attached to the housing 151 between the end portion of the cleaning blade 151 and the housing 151. The side seal portion 162 includes an elastic member 162a and a seal member 162b. The elastic member 162 a is attached to the housing 150 on the side of the end portion of the cleaning blade 151, and is in contact with the side surface in the axial direction of the end portion of the cleaning blade 151. At this time, the portion where the elastic member 162 a contacts the axial side surface of the cleaning blade 151 is pressed and crushed by the axial side surface of the cleaning blade 151. In this way, the transfer residual toner collected in the collection unit is prevented from leaking from both ends of the cleaning blade to the photosensitive drum side. The seal member 162b is bonded to the side of the elastic member 162a and the housing 150 facing the photosensitive drum with, for example, a double-sided tape 162c, and can contact the photosensitive drum.
JP-A-7-325527

  In the conventional cleaning device, the side seal portion is attached to the housing between the end portion of the cleaning blade and the housing. In the side seal portion, the portion where the elastic member abuts on the axial side surface of the cleaning blade is in a state of being crushed by the axial side surface of the cleaning blade. In other words, the side surface in the axial direction of the cleaning blade is in a state of being bitten into the elastic member. Then, in the constant load type cleaning device in which the cleaning blade is urged against the photosensitive drum with a constant load by urging the cleaning blade toward the photosensitive drum using an urging force such as a spring, both ends are elastic. Since the cleaning blade that has bitten into the member is difficult to move to the photosensitive drum side due to the urging force, the linear pressure of the cleaning blade on the photosensitive drum is insufficient when the cleaning blade that is in sliding contact with the photosensitive drum is worn. There is a risk that. In addition, when the cleaning blade is assembled to the blade mounting portion of the housing with the axial side surface of the cleaning blade biting into the elastic member, the elastic member is easily caught between the cleaning blade and the blade mounting portion. . On the other hand, in the conventional cleaning device, the seal member is mounted on the side of the housing and the elastic member mounted on the housing facing the photosensitive drum. In other words, the elastic member is restrained by the housing and the seal member and is not easily deformed. Then, in the cleaning device of the constant load method, when the cleaning blade with both ends biting into the elastic member becomes difficult to move to the photosensitive drum side by the urging force, and the cleaning blade slidingly contacting the photosensitive drum is worn, There is a possibility that the linear pressure of the cleaning blade on the photosensitive drum is further insufficient.

  SUMMARY OF THE INVENTION An object of the present invention is to prevent transfer residual toner collected by a collecting portion from leaking from both ends of a cleaning blade to the photosensitive drum side without causing both ends of the cleaning blade to bite into an elastic member.

  According to a first aspect of the present invention, there is provided an image forming apparatus cleaning apparatus for removing and collecting transfer residual toner on the surface of a photosensitive drum. The cleaning device includes a housing, a cleaning blade, and a pair of side seal portions. The housing has a collection unit capable of collecting the transfer residual toner. The cleaning blade is mounted on the housing along the surface of the photosensitive drum, and is slidably contacted with the photosensitive drum to remove residual toner on the surface of the photosensitive drum. The pair of side seal portions includes a first side seal and a second side seal. The first side seal is attached to the housing so as to be able to contact the respective axial side surfaces of both ends of the cleaning blade. The first side seals are in contact with the respective surfaces of both ends of the photosensitive drum to prevent the transfer residual toner from leaking out of the housing from both axial sides of the photosensitive drum. The second side seal is attached to the first side seal so as to be able to abut on the surfaces of the respective collection portions at both ends of the cleaning blade. The second side seal prevents transfer residual toner from leaking from both sides in the axial direction of the cleaning blade to the photosensitive drum side.

  In this cleaning device, the transfer residual toner on the surface of the photosensitive drum is removed by a cleaning blade mounted on the housing along the surface of the photosensitive drum. Then, the transfer residual toner removed by the cleaning blade is collected in a collection unit of the housing. At this time, the first side seals in contact with the respective surfaces of both ends of the photosensitive drum prevent leakage of transfer residual toner from both sides in the axial direction of the photosensitive drum to the outside of the housing. Further, the transfer residual toner leaks from the both sides in the axial direction of the cleaning blade to the photosensitive drum side by the second side seal that is attached to the first side seal and abuts on the surfaces of the respective collecting portions at both ends of the cleaning blade. To prevent it.

  Here, the second side seal is attached to the first side seal, and is in contact with the surfaces of the recovery blades at both ends of the cleaning blade. Thus, leakage of the transfer residual toner from both ends of the cleaning blade to the photosensitive drum side can be prevented by the second side seal without causing both ends of the cleaning blade to bite into the elastic member. In addition, since the second side seal is provided, it is not necessary to bite both ends of the cleaning blade into the elastic member. Therefore, in the constant load type cleaning device, the cleaning blade is easily moved to the photosensitive drum side by the urging force. Therefore, the cleaning blade can smoothly move toward the photosensitive drum according to the amount of wear of the cleaning blade that is in sliding contact with the photosensitive drum, and the linear pressure of the cleaning blade on the photosensitive drum can be ensured. Furthermore, if it is not necessary to bite both ends of the cleaning blade into the elastic member by providing the second side seal, when the cleaning blade is assembled to the blade mounting portion, the elastic member is placed between the cleaning blade and the blade mounting portion. It becomes difficult to bite into.

  In the cleaning device for an image forming apparatus according to a second aspect, in the cleaning device for the image forming apparatus according to the first aspect, the second side seal has a mounting portion and a non-mounting portion. Here, the mounting portion is a portion to be mounted on the first side seal. The non-mounting portion is a portion that is not mounted on the first side seal facing the cleaning blade side. In this case, since the second side seal is not attached to the first side seal facing the cleaning blade in the non-attachment portion, in the constant load type cleaning device, the cleaning blade is located on the photosensitive drum side. It can move smoothly. As a result, the linear pressure of the cleaning blade on the photosensitive drum can be reliably ensured.

  According to a third aspect of the present invention, there is provided the image forming apparatus cleaning apparatus according to the first or second aspect, wherein the first side seal includes an elastic member and a seal member. The elastic member is attached to the housing between the end of the cleaning blade and the housing. The elastic member is in contact with the axial side surface of the end portion of the cleaning blade. The seal member is attached to the housing so as to cover the photosensitive drum side of the elastic member, and can contact the photosensitive drum. In this case, the seal member is mounted on the housing in a state of covering the photosensitive drum side of the elastic member. The seal member in this state is attached to the housing but is not attached to the elastic member. Thereby, the elastic member is not restrained by the seal member and is easily deformed. As a result, the axial length of the cleaning blade is slightly longer than the specified value due to manufacturing variations, and the axial side surface of the end of the cleaning blade may slightly bite into the elastic member during assembly. However, in the constant load type cleaning device, the cleaning blade can smoothly move toward the photosensitive drum. As a result, the linear pressure of the cleaning blade on the photosensitive drum can be reliably ensured.

  According to the present invention, the second side seal is attached to the first side seal, and is in contact with the surfaces of the respective recovery portions at both ends of the cleaning blade. Thus, leakage of the transfer residual toner from both ends of the cleaning blade to the photosensitive drum side can be prevented by the second side seal without causing both ends of the cleaning blade to bite into the elastic member.

  FIG. 1 is a schematic sectional view showing an image forming apparatus 10 according to an embodiment of the present invention. The image forming apparatus 10 includes a copying machine body 11, and the copying machine body 11 includes an image reading device 12 and a printing device 13. The image reading device 12 is for reading image information of a document, and is arranged on the upper part of the copying machine main body 11. The printing device 13 is for forming a toner image on a transfer material such as paper according to the image information read by the image reading device, and is disposed at the lower part of the copying machine main body 11.

  The image reading device 12 includes a document table 14, a document pressing plate 15, a scanning unit 18, second and third reflecting mirrors 20 and 21, a lens array 22, and a CCD 23. On the document table 14, the image surface of the document is arranged. The document pressing plate 15 is for bringing the image surface of the document into close contact with the upper surface of the document table, and is mounted on the document table 14 so as to be freely opened and closed. The scanning unit 18 scans the image surface of the document and reads image information. The scanning unit 18 is, for example, a fixed reading mechanism that reads a document surface of a document fixed on a document table while moving left and right in FIG. 1, and a document surface while moving the document while being fixed at the position of FIG. And a flow reading mechanism for reading. Further, the scanning unit 18 includes a light source 16 and a first reflecting mirror 17 that irradiates light from below on the image surface of the document on the document table. The second and third reflection mirrors 20 and 21 are for reflecting the reflected light from the first reflection mirror 17 and guiding it to the lens array 22. The lens array 22 is for imaging the reflected light from the third reflecting mirror 21 by a large number of lens elements (not shown). Information on the light imaged by the lens array 22 is incident on the CCD 23. In the CCD 23, the light information from the lens array 22 is converted into digital data.

  The printing apparatus 13 includes a photosensitive drum 30 as an electrostatic latent image carrier. The photoreceptor drum 30 has a drum base and a photosensitive layer. The drum base is formed of a conductive material such as aluminum. The photosensitive layer is provided on the outer peripheral surface of the drum base, and is formed of a material such as OPC (organic optical semiconductor) or amorphous silicon. Such a photosensitive drum 30 is supported by the copying machine main body 11 so as to be rotatable in the arrow direction (clockwise direction) shown in FIG. Around the photosensitive drum 30, a charger 31, an exposure device 32, a developing device 33, a transfer charger 34, and a cleaning device 35 are arranged along the rotation direction of the photosensitive drum. .

  A charging bias is applied to the charger 31 by a charging bias application power source (not shown), and the surface of the photosensitive drum 30 is charged to a predetermined polarity and potential by the charging bias.

  The exposure device 32 is for forming an electrostatic latent image on the surface of the photosensitive drum 30. The exposure device 32 has a laser transmitter (not shown). Image information of the original read by the image reading device 12 is input to the laser transmitter as an image signal. Based on this image signal, the laser transmitter transmits a laser beam toward the photosensitive drum 30. The surface of the photosensitive drum 30 charged by the charger 31 is exposed by the laser light. As a result, the charge on the exposed portion of the surface of the photosensitive drum 30 is removed, and an electrostatic latent image is formed on the surface of the photosensitive drum 30.

  The developing device 33 includes a developer storage container 46 that stores the developer and a developing roller 47. A developing bias is applied to the developing roller 47 by a developing bias applying power source (not shown). In this state, the developing roller 47 conveys the developer in the developer container 46 to a position facing the surface of the photosensitive drum 30 while rotating in the arrow direction (counterclockwise direction) shown in FIG. . Then, the toner in the developer adheres to the electrostatic latent image formed on the surface of the photosensitive drum 30, and the electrostatic latent image is developed as a toner image.

  The transfer charger 34 is a roller-shaped member and is disposed so as to face the surface of the photosensitive drum 30. A transfer bias having a polarity opposite to that of the surface of the photosensitive drum 30 is applied to the surface of the transfer charger 34 by a transfer bias application power source (not shown). The transfer charger 34 to which such a transfer bias is applied transfers the toner image on the surface of the photosensitive drum 30 onto a transfer material such as paper conveyed between the transfer charger 34 and the photosensitive drum 30. The

  The printing apparatus 13 also includes a paper feed cassette 37, a paper feed roller 38, and a transport along a transport path 36 (a dashed line in FIG. 1) of a transfer material such as paper (from the bottom to the top in FIG. 1). A roller pair 40, a registration roller pair 41, a conveyance guide 42, a fixing device 43, a paper discharge roller pair 44, and a paper discharge tray 45 are arranged. A transfer material such as paper stored in the paper feed cassette 37 is discharged from the paper feed cassette 37 by the paper feed roller 38 and is transported to the upper registration roller pair 41 by the transport roller pair 40. The transfer material conveyed to the registration roller pair 41 is temporarily stopped by the registration roller pair 41. Thereafter, the registration roller pair 41 waits for the timing at which the toner image on the surface of the photosensitive drum 30 reaches between the photosensitive drum 30 and the transfer charger 34, and is stopped at the position of the registration roller pair 41. Is sent from the registration roller pair 41 to between the photosensitive drum 30 and the transfer charger 34. Then, the toner image on the surface of the photosensitive drum 30 is transferred to the transfer material between the photosensitive drum 30 and the transfer charger 34. The transfer material onto which the toner image has been transferred is guided to the fixing device 43 by the conveyance guide 42, and is heated and pressurized by the fixing device 43. In this way, the toner image is fixed on the transfer material. Then, the transfer material on which the toner image is fixed is discharged onto the paper discharge tray 45 by the paper discharge roller pair 44.

  As described above, the image forming apparatus 10 can transfer and fix the toner image onto a transfer material such as paper, but the toner image on the surface of the photosensitive drum 30 is transferred between the photosensitive drum 30 and the transfer charger 34. After the transfer to a transfer material such as paper, the transfer residual toner remaining without being transferred from the surface of the photosensitive drum 30 to the transfer material is attached to the surface of the photosensitive drum 30. This transfer residual toner is removed and collected by the cleaning device 35.

  As shown in FIGS. 2 and 3, the cleaning device 35 mainly includes a housing 50, a cleaning blade 51, and a pair of side seal portions 52. The housing 50 includes a collecting unit 56 that can collect the transfer residual toner and a blade mounting unit 55 for mounting the cleaning blade 51. The cleaning blade 51 is for slidingly contacting the photosensitive drum 30 to remove the transfer residual toner on the surface of the photosensitive drum 30. The cleaning blade 51 is formed in a long plate shape along the axial direction of the photosensitive drum 30. For example, the cleaning blade 51 is made of polyurethane rubber, silicon rubber or the like having moderate elasticity. Such a cleaning blade 51 is mounted on the housing 50 along the surface of the photosensitive drum 30. Specifically, the cleaning blade 51 is mounted on the blade mounting portion 55, and an edge portion 51 a long in the longitudinal direction is in sliding contact with the surface of the photosensitive drum 30. The blade mounting portion 55 is for urging the cleaning blade 51 toward the photosensitive drum 30, and allows the cleaning blade 51 to contact the photosensitive drum 30 with a constant load. The blade mounting portion 55 includes a pair of shaft portions 55a that are rotatably mounted on the housing 50, a holding portion 55b that holds the cleaning blade 51, and a pair that integrally connects the holding portions 55b to both ends of the shaft portion 55a. And a connecting portion 55c. The blade mounting portion 55 is disposed on the outer periphery of the shaft portion 55a between the connecting portion 55c and the housing 50, and is connected to the housing 50 via a torsion coil spring (not shown) whose both ends are locked to the connecting portion 55c and the housing 50. It is attached to. In the blade mounting portion 55, the holding portion 55b and the connecting portion 55c can swing around the rotation axis of the shaft portion 55a together with the shaft portion 55a, and the cleaning blade 51 held by the holding portion 55b is made of a torsion coil spring. The urging force urges the photosensitive drum 30 side together with the blade mounting portion 55. In this way, the cleaning blade 51 can be brought into contact with the photosensitive drum 30 with a constant load.

  The pair of side seal parts 52 includes a first side seal 62 and a second side seal 72 as shown in FIGS. The first side seal 62 is in contact with the respective surfaces of both ends of the photosensitive drum 30 to prevent the transfer residual toner from leaking out of the housing 50 from both axial sides of the photosensitive drum 30. The first side seal 62 is attached to the housing 50 so as to be able to contact the respective axial side surfaces of both ends of the cleaning blade 51.

  The first side seal 62 includes an elastic member 62a and a seal member 62b. The elastic member 62 a is attached to the housing 50 between the end portion of the cleaning blade 51 and the housing 50. In this state, the elastic member 62 a is in contact with the axial side surface of the end portion of the cleaning blade 51. Specifically, the elastic member 62a is formed in a rectangular shape, for example, with a soft foamed polyurethane foam or the like, and is disposed in a gap between the housing 50 and the axial end surface of the cleaning blade 51. One surface of the elastic member 62 a is attached to the housing 50 on the side of the end of the cleaning blade 51, and the other surface facing the one surface is in contact with the end surface in the axial direction of the cleaning blade 51. The elastic member 62 a is formed so that the surface on the photosensitive drum 30 side is substantially equal to the curvature of the surface of the photosensitive drum 30. The seal member 62b is attached to the housing 50 so as to cover the photosensitive drum 30 side of the elastic member 62a, and can contact the photosensitive drum 30. Specifically, the seal member 62b is formed in an L shape, such as a Teflon (registered trademark) sheet, and covers the surface of the elastic member 62a on the photosensitive drum 30 side in the L-shaped vertical portion 62c. In this state, it is adhered to the housing 50 with a double-sided tape 62e, for example. The L-shaped lateral portion 62d covers a second side seal 72 described later. At this time, the seal member 62b is not bonded to the surface of the elastic member 62a on the photosensitive drum 30 side and the surface of the second side seal 72 on the photosensitive drum 30 side.

  The second side seal 72 is for preventing the transfer residual toner from leaking from both sides of the cleaning blade 51 in the axial direction to the photosensitive drum 30 side. The second side seal 72 is attached to the first side seal 62 so as to be able to come into contact with the surfaces of the recovery blades 56 at both ends of the cleaning blade 51. Specifically, the second side seal 72 is formed in, for example, a rectangular shape using a soft foamed polyurethane foam or the like, and is attached to the first side seal surface on the side in contact with the axial end surface of the cleaning blade 51. The second side seal 72 comes into contact with the surface of the cleaning blade 51 on the collecting portion 56 side when the cleaning blade 51 is attached to the blade attachment portion 55. When the cleaning blade 51 and the first side seal 62 are brought into contact with the surface of the photosensitive drum 30, the second side seal 72 is crushed by the cleaning blade 51. The second side seal 72 is a portion where the second side seal 72 is attached to the first side seal 62 and a portion where the second side seal 72 is not attached to the first side seal 62. And a non-mounting portion 72b. In the mounting portion 72 a, the second side seal 72 is bonded to the first side seal surface on the side in contact with the axial end surface of the cleaning blade 51. The non-mounting portion 72 b is crushed by the cleaning blade 51 when the cleaning blade 51 is mounted on the blade mounting portion 55. In the non-mounting portion 72b in this state, the non-mounting range X from the surface on the collection unit side of the cleaning blade 51 to the mounting portion 72a is set to be about 3.0 mm or more.

  In the cleaning device 35 according to this embodiment, the second side seal 72 is attached to the first side seal 62 and is in contact with the surfaces of the cleaning blades 51 on the collection unit 56 side. Accordingly, the second side seal 72 prevents leakage of the transfer residual toner from both ends of the cleaning blade 51 to the photosensitive drum 30 side without causing both ends of the cleaning blade 51 to bite into the elastic member 62a. Can do. If the second side seal 72 is provided to eliminate the need to bite both ends of the cleaning blade 51 into the elastic member 62a, the cleaning blade 51 can easily move to the photosensitive drum 30 side by the biasing force. Then, the cleaning blade 51 can smoothly move toward the photosensitive drum 30 according to the amount of wear of the cleaning blade 51 that is in sliding contact with the photosensitive drum 30, and the linear pressure of the cleaning blade 51 on the photosensitive drum 30 is ensured. Can do. If the second side seal 72 is provided so that the both end portions of the cleaning blade 51 do not have to bite into the elastic member 62 a, the elastic member 62 a is used when the cleaning blade 51 is assembled to the blade mounting portion 55. Between the blade mounting portion 55 and the blade mounting portion 55. Further, when the cleaning blade 51 is attached to the blade attachment portion 55, the non-attachment portion 72b of the second side seal 72 is compressed, and the cleaning blade 51 is urged toward the photosensitive drum 30 by the compressed non-attachment portion 72b. Therefore, the cleaning blade 51 can move more smoothly on the photosensitive drum 30 side.

  The seal member 62b is attached to the housing 50 in a state of covering the photosensitive drum 30 side of the elastic member 62a. The seal member 62b in this state is attached to the housing 50 but is not attached to the elastic member 62a. Thereby, the elastic member 62a is not restrained by the seal member 62b and is easily deformed. Then, the axial length of the cleaning blade 51 becomes slightly longer than the prescribed value due to variations in manufacturing, and the axial side surface of the end of the cleaning blade 51 slightly bites into the elastic member 62a during assembly. Even if there is nothing, the cleaning blade 51 can smoothly move to the photosensitive drum 30 side. Thereby, the linear pressure of the cleaning blade 51 to the photosensitive drum 30 can be ensured.

[Other Embodiments]
(A) The present invention can be applied to the image forming apparatus 10 such as a copying machine, a printer, and a facsimile machine that includes the cleaning device 35.

1 is a schematic sectional view showing an image forming apparatus according to an embodiment of the present invention. The whole perspective view of a cleaning device. FIG. 3 is an enlarged perspective view of an end portion of the cleaning device. The expansion perspective view of a side seal part. The figure which looked at the said side seal part from the side. AA sectional view of the side seal part Sectional drawing equivalent to FIG. 6 of the conventional side seal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 30 Photosensitive drum 35 Cleaning apparatus 50 Housing 51 Cleaning blade 52 Side seal part 56 Recovery part 62 1st side seal 72 2nd side seal 72a Mounting part 72b Non-mounting part 62a Elastic member 62b Seal member

Claims (2)

A cleaning device for an image forming apparatus for removing and collecting transfer residual toner on the surface of a photosensitive drum,
A housing having a collecting portion capable of collecting the transfer residual toner;
A cleaning blade mounted on the housing along the surface of the photosensitive drum, and slidably contacting the photosensitive drum to remove the transfer residual toner on the surface of the photosensitive drum;
The transfer residual toner is attached to the surfaces of both ends of the photosensitive drum mounted on the housing so as to be able to contact the axial side surfaces of both ends of the cleaning blade. adhered to the first side seal and each of said collecting portion capable of abutting against as the first side seal surface of both end portions of the cleaning blade for preventing the opposite sides from leaking to the outside of the housing A pair of side seal portions having a second side seal for preventing the transfer residual toner from leaking from both sides in the axial direction of the cleaning blade to the photosensitive drum side ,
The second side seal includes an adhesive portion which is a portion to be bonded to the first side seal on the side where the second side seal contacts the axial end surface of the cleaning blade, and a surface on the recovery portion side of the cleaning blade A non-adhesive portion that is a portion from the adhesive portion to the adhesive portion, and the second side seal is not attached to the first side seal,
A cleaning device for an image forming apparatus. The first side seal includes an elastic member that is attached to the housing between an end portion of the cleaning blade and the housing and contacts an axial side surface of the end portion of the cleaning blade; and the photosensitive drum of the elastic member A seal member that is attached to the housing in a state of covering the side and is capable of contacting the photosensitive drum,
The image forming apparatus cleaning apparatus according to claim 1 .

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