The present invention relates to a cartridge and a drum unit usable for an electrophotographic type image forming apparatus such as a laser beam printer.
In the field of the electrophotographic type image forming apparatus, the structure is known in which elements such as a photosensitive drum and a developing roller as rotatable members contributable for image formation are unified as a cartridge which is detachably mountable to a main assembly of the image forming apparatus (main assembly). Here, in order to rotate the photosensitive drum in the cartridge, it is desirable to transmit a driving force thereto from the main assembly. It is known, for this purpose, to transmit the driving force through engagement between a coupling member of the cartridge and a driving force transmitting portion such as a drive pin of the main assembly side of the apparatus.
In some types of image forming apparatuses, a cartridge is demountable in a predetermined direction substantial perpendicular to a rotational axis of the photosensitive drum. In a known main assembly, the drive pin of the main assembly is moved in the rotational axis direction by an opening and closing operation of a cover of the main assembly. More particularly, a patent specification 1 discloses a structure in which a coupling member provided at an end portion of the photosensitive drum is pivotably relative to the rotational axis of the photosensitive drum. With this structure, the coupling member provided on the cartridge is engaged with the drive pin provided in the main assembly, by which the driving force is capable of being transmitted from the main assembly to the cartridge, as is known.
The present invention provides a further improvement of the above-described prior-art.
According to an aspect of the present invention, there is provided a cartridge mountable to a main assembly of an electrophotographic image forming apparatus, said coupling member comprising a pivotable coupling member, wherein the main assembly including a rotatable engaging portion for engaging with said coupling member, and a coupling guide, positioned downstream of a rotational axis of the engaging portion with respect to a mounting direction of said cartridge, for being contacted by said coupling member pivoted relative to the rotational axis of the engaging portion to guide said coupling member to be parallel with the rotational axis of the engaging portion, said cartridge being mountable to the main assembly in the mounting direction substantially perpendicular to the rotational axis of the engaging portion, said cartridge comprising a frame; a rotatable member for carrying a developer; and a rotatable force receiving member for receiving a rotational force to be transmitted to said rotatable member; said coupling member including a free end portion having a receiving portion for receiving the rotational force from the engaging portion and a connecting portion having a transmitting portion for transmitting the rotational force received by said receiving portion to said force receiving member, said frame including a hole portion for exposing said free end portion to an outside of said frame, and a receiving portion, provided in a downstream of said hole portion with respect to the mounting direction, for receiving said coupling member when said coupling member is inclined toward a downstream side with respect to the mounting direction and for receiving said coupling guide in place of said coupling member with engagement of said coupling member with the engaging portion.
According to another aspect of the present invention, there is provided a drum unit dismountable from a main assembly of an electrophotographic image forming apparatus by moving in a predetermined direction substantially perpendicular to a rotational axis of an engaging portion rotatably provided in the main assembly, wherein a rotatable coupling member is mountable to said drum unit, the coupling including a free end portion having a receiving portion for receiving a rotational force from said engaging portion, and a connecting portion having a transmitting portion for transmitting the rotational force received by said receiving portion, said connecting portion being provided with a through-hole, wherein said coupling member is mountable to said drum unit by holding opposite end portions of a shaft penetrating the through-hole, said drum unit comprising a cylinder having a photosensitive layer; and a flange mounted to an end portion of said cylinder, said flange being provided with an accommodating portion capable of accommodating the connecting portion and capable of pivotably holding coupling member, an annular groove portion in said accommodating portion outside with respect to a radial direction of said cylinder, and a holding portion for holding the opposite end portions of the shaft penetrating said through-hole, wherein said groove portion and said holding portion overlap along a rotational axis direction of said cylinder.
Referring to the accompanying drawings, the embodiments of the present invention will be described.
Here, an electrophotographic image forming apparatus is an image forming apparatus using an electrophotographic type process. In the electrophotographic type process, an electrostatic image formed on a photosensitive member is developed toner. The developing system may be a one-component developing system, two-component developing system, dry type development or another system. An electrophotographic photosensitive drum comprises a drum configuration cylinder and a photosensitive layer thereon, usable with an electrophotographic type image forming apparatus.
A process means includes a charging roller, a developing roller and so on, which are actable on the photosensitive drum, for image formation. A process cartridge these cartridge including the photosensitive member or process means (cleaning blade, developing roller or the like) relating to the image formation. In the embodiment, a process cartridge comprises the photosensitive drum, the charging roller, the developing roller and the cleaning blade as a unit.
More particularly, it is a laser beam printer of the electrophotographic type widely usable as a multifunction machine, a facsimile machine, a printer or the like. Reference numeral or characters in the following descriptions are for referring to the drawings and do not limit the structure of the present invention. The dimensions or the like in the following descriptions are to clarify the relationships and do not limit the structure of the present invention.
A longitudinal direction of the process cartridge in the following description is a direction substantially perpendicular to a direction in which the process cartridge is mounted to the main assembly of the electrophotographic image forming apparatus. A longitudinal direction of the process cartridge is a direction parallel with a rotational axis of the electrophotographic photosensitive drum (direction crossing with a sheet feeding direction). A side of the process cartridge in the longitudinal direction thereof where the photosensitive drum receive a rotational force from the main assembly of the image forming apparatus is a driving side (driven side), and the opposite side is a non-driving side. In the following description, an upper part (upper side) is on the basis of the direction of gravity in the state that the image forming apparatus is installed, unless otherwise be described, and the opposite side is a lower part (lower side).
In the following, the laser beam printer according to this embodiment will be described in conjunction with the accompanying drawings. The cartridge in this embodiment comprises a photosensitive drum as a photosensitive member (image bearing member, rotatable member), and process means including a developing roller, a charging roller and a cleaning blade as a unit (process cartridge). The cartridge is detachably mountable to the main assembly. The cartridge is provided therein with a rotatable member (gear, photosensitive drum, flange, developing roller) which is rotatable by a rotational force from the main assembly Ad among them, a member for carrying and feeding a toner image is called carrying member.
Referring to
1. Laser Beam Printer and Image Forming Process
The main assembly A is portions of the laser beam printer other than the process cartridge B.
Referring to
The electrophotographic image forming apparatus shown in
Below the process cartridge B, a sheet tray 4 accommodating sheets P (recording materials) on which images are formed by the image forming apparatus.
Furthermore, the apparatus main assembly A comprises a pick-up roller 5a, a feeding roller pair 5b, a feeding roller pair 5c, a transfer guide 6, a transfer roller 7, a feeding guide 8, a fixing device 9, a discharging roller pair 10 and a discharging tray 11, arranged in the order named from an upstream side along a sheet feeding direction X1. The fixing device 9 as fixing means comprises a heating roller 9a and a pressing roller 9b.
Referring to
In response to a print starting signal, a rotatable photosensitive drum 62 (drum 62) is rotated at a predetermined peripheral speed (process speed) in an arrow R.
A charging roller 66 supplied with a bias voltage is contacted to an outer peripheral surface of the drum 62 to electrically charge the outer peripheral surface of the drum 62 uniformly.
The laser scanner unit 3 as exposure means outputs a laser beam L modulated in accordance with image information inputted to the laser beam printer. The laser beam L passes through an exposure window 74 provided in an upper surface of the process cartridge B and scanningly impinges on the outer peripheral surface of the drum 62. By this, a part on the charged photosensitive member is electrically discharged so that an electrostatic image (electrostatic latent image) is formed in the surface of the photosensitive drum.
On the other hand, as shown in
The toner T as the developer is carried on a surface of a developing roller 32 as developing means (process means, rotatable member) by a magnetic force of a magnet roller 34 (fixed magnet). The developing roller 32 functions as a rotatable member for carrying and feeding the developer into a developing zone to develop an electrostatic image formed on the photosensitive member. The toner T which is to be fed into the developing zone is regulated in a layer thickness on the peripheral surface of the developing roller 3, by a developing blade 42. The toner T is triboelectrically charged between the developing roller 32 and the developing blade 42.
The electrostatic image formed on the drum 62 is developed (visualized) by the toner T for carried on the surface of the developing roller. The drum 66 rotates in the direction of an arrow R, carrying a toner image provided by the development,
As shown in
The sheet P is supplied into a transfer position (transfer nip) which is between the drum 62 and the transfer roller 7, along the transfer guide 6. In the transfer position, the toner image is sequentially transferred from the drum 62 as the image bearing member onto the sheet P as the recording material.
The sheet P having the transferred toner image is separated from the drum 62 as the image bearing member and is fed to the fixing device 9 along the feeding guide 8. The sheet P passes through a fixing nip formed between the heating roller 9a and the pressing roller 9b in the fixing device 9. In the fixing nip, the unfixed toner image on the sheet P is pressed and heated so that it is fixed on the sheet P. Thereafter, the sheet P having the fixed toner image is fed by the discharging roller pair 10 and is discharged onto the discharging tray 11.
On the other hand, as shown in
In this case, the charging roller 66, the developing roller 32 and the cleaning blade 77 function as process means acting on the drum 62. In the image forming apparatus of this embodiment, the untransferred toner is removed by the cleaning blade, but the present invention is applicable to a type (cleanerless type) In which the untransferred toner is adjusted in the electric charge and then collected simultaneously with the development by the developing device. In the cleanerless type, an assistance charging member (auxiliary charging brush or the like) for adjusting the electric charge of the untransferred toner also functions as the process means.
2. Structure of Process Cartridge
Referring to
The cleaning unit 60 comprises a cleaning frame 71, the drum 62, the charging roller 66, the cleaning blade 77 and so on. A driving side end portion of the drum (cylinder) 62 as the rotatable member is provided with a coupling member 86 (coupling) as a driving force transmitting part. To the drum 62 as the rotatable member, a driving force is transmitted from the main assembly through the coupling member 86 (coupling). In other words, the coupling member 86 (coupling) as a drive transmission part is provided at the end portion (driven side end portion) where the drum 62 is driven by the apparatus main assembly A.
As shown in
On the other hand, the developing unit 20 comprises a toner accommodating container 21, a closing member 22, a developing container 23, a first side member 26L (driving side), a second side member 26R (non-driving side), a developing blade 42, a developing roller 32 and a magnet roller 34. The toner container 21 contains toner T as the developer in this provided with a feeding screw 43 (stirring sheet) as a feeding member for feeding the toner. The developing unit 20 is provided with a spring (coil spring 46 in this embodiment) as an urging member for applying an urging force to regulate an attitude of the developing unit 20 and the cleaning unit 60 relative to each other. Furthermore, the cleaning unit 60 and the developing unit 20 are rotatably connected with each other by connection pins 75 (connection pins, pins) as connecting members to constitute the process cartridge B.
More specifically, arm portions 23aL, 23aR provided opposite end portions of the developing container 23 with respect to the longitudinal direction of the developing unit 20 (axial direction of the developing roller 32) is provided at free end portions rotation holes 23bL and 23bR. The rotation holes 23bL, 23bR are in parallel with the axis of the developing roller 32.
Longitudinal opposite end portions of the cleaning frame 71 which is a frame (casing) of the cleaning unit are provided with respective holes 71a for receiving the connection pins 75. The arm portions 23aL and 23aR are aligned with a predetermined position of the cleaning frame 71, and the connection pins 75 are inserted through the rotation holes 23bL and 23bR and the holes 71a. By this, the cleaning unit 60 and the developing unit 20 are connected with each other rotatably about the connection pins 75 as the connecting members.
At this time, the coil spring 46 as the urging member mounted to the base portion of each of the arm portions 23aL and 23aR abuts to the cleaning frame 71, so that the developing unit 20 is urged to the cleaning unit 60 about the connection pin 75.
By this, the developing roller 32 as the process means is assuredly urged toward the drum 62 as the rotatable member. Opposite end portions of the developing roller 32 are provided with respective ring configuration spacers (unshown) as gap holding members, by which the developing roller 32 is spaced from the drum 62 by a predetermined gap.
3. Mounting and Dismounting of Process Cartridge
Referring to
The apparatus main assembly A is provided with a rotatably door 13.
Inside the apparatus main assembly A is provided with a drive head 14 as a main assembly side engaging portion and a guiding member 12 as a guiding mechanism. The drive head 14 is a drive transmission mechanism of the main assembly side for transmitting the driving force to the cartridge mounted thereto through engagement with the coupling member 86 of the cartridge. By the rotation of the drive head 14 after the engagement, the rotational force can be transmitted to the cartridge. The drive head 14 can be deemed as a main assembly side coupling in the sense that it is engaged with the coupling of the process cartridge B to transmit the driving force. The drive head 14 as the main assembly side engaging portion is rotatably supported by the apparatus main assembly A. The drive head 14 includes a drive shaft 14a as a shaft portion, a drive pins 14b as an applying portions for applying the rotational force ((b3) of
The guiding member 12 is a main assembly side guiding member for guiding the process cartridge B in the apparatus main assembly A. The guiding member 12 may be a plate-like member provided with a guiding groove or a member for guiding the process cartridge B at the lower surface of the process cartridge B while supporting it.
Referring to
The process cartridge B is mounted to the apparatus main assembly Ain the process from (a1) to (a4) of
An arrow X2 and an arrow X3 in
As shown in
In the rotational axis of drum 62 is the axis L1, the rotational axis of the coupling member 86 is the axis L2, and the rotational axis of the drive head 14 functioning main assembly side engaging portion is the axis L3. As shown in (b1) to (b3) of
When the process cartridge B is inserted to an extent shown in (a3) and (b3) of
In this embodiment, the drive pin 14b as the applying portion is contacted by the standing-by portion 86k1 of the coupling member. However, depending on the phases of the coupling member 86 and the drive head 14 in the rotational moving direction, the portion where the coupling member 86 and the drive head 14 contact to each other is different. Therefore, the contact positions in this embodiment is not limiting to the present invention. It will suffice if a portion of the free end portion 86a of the coupling member (the detailed will be described hereinafter) contacts to a portion of the drive head 14.
When the process cartridge B is inserted to the mounting completion position, the axis L2 is substantially coaxial with the axis L1 (axis L3) as shown in parts (a4) and (b4) of
By the engagement of the coupling member 86 provided in the process cartridge B with the drive head 14 as the main assembly side engaging portion in this manner, the transmission of the rotational force is enabled from the main assembly to the cartridge. When the process cartridge B is dismounted from the apparatus main assembly A, the process is the reciprocal, that is, from the state of (a4) and (b4) toward the state of (a1) and (b1) in
The movement of the process cartridge B in the X2 direction or X3 direction may occur only in the neighborhood of the mounting completion position. In another position other than the mounting completion position, the process cartridge B may move in any direction. In other words, it will suffice if a track of movement of the cartridge immediately before the engagement or disengagement of the coupling member 86 relative to the drive head 14 is the predetermined direction which is substantially perpendicular to the rotational axis L3 of the drive head 14.
4. Coupling Member
Referring to
For the purpose of better explanation, an imaginary line will drawn on a planar view, and an imaginary plane will be drawn on a perspective view. When a plurality of imaginary lines are to be used, first imaginary line, second imaginary line, third imaginary line or the like will be used. Similarly, when a plurality of imaginary planes are to be used, first imaginary plane, second imaginary plane, third imaginary plane or the like will be used. An inside of the cartridge (inward direction of the cartridge) and an outside of the cartridge (outward of direction of the cartridge) are based on the frame of the cartridge, unless otherwise mentioned.
Part (a) of
Part (c) of
As shown in
A first portion is a free end portion 86a engageable with the drive head 14 as the main assembly side engaging portion to receive the rotational force from the drive head 14. The free end portion 86a includes an opening 86m expanding toward the driving side.
A second portion is a substantially spherical connecting portion 86c (accommodated portion). The connecting portion 86c is pivotably held (connected) by a driving side flange 87 which is a force receiving member. One end portion side of the drum (cylinder end portion) is provided with a driving side flange 87, and the other end portion side is provided with a non-driving side flange 64.
The first portion can be deemed as including the one end portion side of the coupling member, and the second portion can be deemed as including the other end portion side of the coupling member. The second portion can be deemed as including a rotational center when the coupling member rotates (pivots) in the state that the coupling member is held by the driving side flange 87.
A third portion is an interconnecting portion 86g connecting the free end portion 86a and the connecting portion 86c with each other.
Here, a maximum rotation diameter φZ2 of the interconnecting portion 86g is smaller than a maximum rotation diameter φZ3 of the connecting portion 86c (φZ2<φZ3), and is smaller than a maximum rotation diameter φZ1 of the free end portion 86a (φZ2<ϕZ1). In other words, a diameter of at least a part of the interconnecting portion 86g is smaller than a diameter of a maximum diameter portion of the connecting portion. In addition, a diameter of at least a part of the interconnecting portion 86g is smaller than a diameter of a maximum diameter portion of the free end portion 86a. These diameters are the maximum diameters about the rotational axis of the coupling member, and they are the maximum diameters of imaginary circles of the respective cross-sectional portions of the coupling member on an imaginary flat plane perpendicular to the rotational axis of the coupling member.
The maximum rotation diameter φZ3 of the connecting portion 86c is larger than the maximum rotation diameter of the free end portion 86a (φZ3>φZ1). With such relationships, when the coupling member 86 is inserted into a hole having a diameter not less than φZ1 and not more than φZ3 from the free end portion 86a side, the coupling member 86 does not penetrate throughout the hole. For this reason, when and after a unit including the coupling member 86 is assembled up, the coupling member is prevented from the unit in which the coupling member is inserted. In this embodiment, the maximum rotation diameter φZ1 of the free end portion 86a is larger than the maximum rotation diameter φZ2 of the interconnecting portion 86g and is smaller than the maximum rotation diameter φZ3 of the connecting portion 86c (φZ3>φZ1>φZ2).
These maximum rotation diameters φZ1, φZ2 and φZ3 can be measured as shown in part (a) of
As shown in part (b) of
As shown in parts (a) and (c), on a circumference extending about the axis L2 at the extreme end portion of the free end portion 86a, there are provided two claw portions 86d1 and 86d2 at point symmetry positions with respect to the axis L2. Standing-by portions 86k1 and 86k2 are provided circumferentially between claw portions 86d1 and 86d2. In this embodiment, a pair of projections are provided, but only one such a projection may be provided. In such a case, the standing-by portion is that portion between the downstream side of the projection and the upstream side of the projection with respect to the clockwise direction. The standing-by portions are the spaces required for the drive pins 14b of the drive head 14 provided in the apparatus main assembly A to wait without contacting the claw portions 86d. The spaces are greater than the diameters of the drive pin 14b as the applying portion for applying the rotational force.
The spaces function as plays when the cartridge is mounted to the apparatus main assembly A. In the radial direction of the coupling member 86, the recess 86z is inside the claw portions 86d1 and 86d2. A width of the claw portion 86d in the diametrical direction is substantially equivalent to a width of the standing-by portion.
As shown in part (c) of
The drive head 14 for transmitting the drive into process cartridge B and the drive pins 14b constitutes a drive transmission mechanism. A member may have a plurality of functions, depending on the configuration of the drive head. In such a case, a surface of a member actually contacting and transmitting the drive is the member constituting the drive transmission mechanism.
In the state that the coupling member 86 is engaged with the drive head 14 and the drive head 14 is rotating, the surfaces of the drive pins 14b of the main assembly side contact side surfaces of the receiving portions 86e1 and 86e2 of the coupling member 86. By this, the rotational force is transmitted from the drive head 14 as the main assembly side engaging portion to the coupling member 86 as the drive transmission part.
In the base portions of the receiving portions 86e1 and 86e2, there are provided undercuts (clearance spaces) 86n1 and 86n2 concaved from the standing-by portions 86k1 and 86k2 toward the connecting portion 86c. Referring to
As shown in part (c) of
As shown in parts (d) and (e) of
In this embodiment, the number of the claw portions 86d1 and 86d2 is two, but this number is not restrictive to the present invention and may be different as long as the drive pins 14b can enter the standing-by portions 86k1 and 86k2. However, because of the necessity of the drive pins 14b entering the standing-by portions, the increase of the number of the claw portions may require reduction of the claw portions per se (width in the circumferential direction in part (c) of
Furthermore, the receiving portions 86e1 and 86e2 may be provided radially inside the receiving surface 86f. Or, the receiving portions 86e1 and 86e2 may be provided at positions radially outside the receiving surface 86f with respect to the axis L2. However, in this embodiment, the driving force from the drive head 14 is received by the side surfaces of the claw portions 86d1, 86d2 projected from the receiving surface 86f in the direction away from the drum 62 along the rotational axis. Therefore, the claw portions 86d1 and 86d2, of the free end portion 86a, for receiving the driving force from the apparatus main assembly are exposed. If an annular flange is provided sounding the projections (claws), the flange will interfere with a part therearound when the coupling member 86 is inclined, and therefore, the inclinable angle of the coupling member 86 is restricted. In addition, the provision of the annular flange may require that the parts therearound are disposed so as not to interfere, with the result of the upsizing of the cartridge B.
Therefore, the structure not having a portion other than the driving force receiving positions (claw portions 86d1, 86d2 in this embodiment) is contributable to the downsizing of the cartridge B (and main assembly A). On the other hand, without the flange surrounding the projections, the liability that the projections are conducted by the other parts during transportation increases. However, as will be described hereinafter, by urging the coupling member 86 by a spring, the claw portions 86d1 and 86d2 can be accommodating within a most outer configuration portion of the bearing member 76. By this, the possibility of the damage of the claw portions 86d1, 86d2 during the transportation can be reduced.
In this embodiment, the projection amount Z15 of the claw portions 86d1 and 86d2 from the standing-by portions 86k1 and 86k2 is 4 mm. This amount is preferable in order to assuredly engaging the claw portions 86d1 and 86d2 with the drive pins 14b without interference of the standing-by portions 86k1 and 86k2 with the drive pins 14b, but may be another depending on the part accuracy. However, if the standing-by portions 86k1 and 86k2 are too far from the drive pin 14b, the formation when the drive is transmitted to the coupling member 86 may increase. On the other hand, if the projection amount of the claw portions 86d1 and 86d2 is increased, the cartridge B and/or the apparatus main assembly A may be upsized. Therefore, the projection amount Z15 is preferably in the range not less than 3 mm and not more than 5 mm.
In this embodiment, a length of the free end portion 86a in the direction of the axis L1 is approx. 6 mm. Therefore, the length of a base portion (portion other than the claw portions 86d1 and 86d2) of the free end portion 86a is approx. 2 mm, and as a result, the length of the claw portions 86d1 and 86d2 in the direction of the axis L1 is longer than the length of the base portion (portion other than the claw portions 86d1 and 86d2).
An inner diameter φZ4 of the receiving portions 86e1 and 86e2 is larger than the maximum rotation diameter φZ2 of the interconnecting portion 86g. In this embodiment, φZ4 is larger than φZ2 by 2 mm.
As shown in
The maximum rotation diameter φZ3 of the connecting portion 86c is larger than the maximum rotation diameter φZ1 of the free end portion 86a. In this embodiment, φZ3 is larger than φZ1 by 1 mm. As for the spherical portion, a substantial diameter may be compared, and if it is partly cut for the convenience of molding, a diameter of an imaginary sphere may be compared. The arcuate surface portions 86q1 and 86q2 are on an arcuate plane provided by extending an arcuate configuration having the same diameter as the interconnecting portion 86g. The hole portion 86b is a through-hole extending in the direction perpendicular to the axis L2. The through-hole 86b includes a first inclination-regulated portions 86p1 and 86p2 and transmitting portions 86b1 and 86b2 parallel with the axis L2.
The first inclination-regulated portions 86p1 and 86p2 have flat surface configurations equidistant from the center C of the spherical 86c1 (Z9=Z9). The transmitting portions 86b1 and 86b2 have flat surface configurations equidistant from the center C of the spherical 86c1 (Z8=Z8). A diameter of the pin 88 pivotably supporting the coupling member 86 through the hole portion 86b is 2 mm. Therefore, the coupling member 86 is inclinable if Z9 exceeds 1 mm. When Z8 is 1 mm, the pin 88 can pass through the hole portion, and if Z8 exceeds 1 mm, the coupling member 86 is rotatable about the axis L1 by a predetermined amount.
The end portions, with respect to the direction perpendicular to the axis L2, of the hole portion 86b of the first inclination-regulated portions 86p1, 86p2 extend to outer edges of the arcuate surface portions 86q1 and 86q2. The end portions, with respect to the direction perpendicular to axis L2, of the hole portion 86b of the transmitting portions 86b1, 86b2 extend to the outer edge of the spherical 86c1.
In addition, as shown in
The material of the coupling member 86 in this embodiment may be resin material such as polyacetal, polycarbonate, PPS, liquid crystal polymer. The resin material may contain glass fibers, carbon fibers or the like, or metal inserted therein, so as to enhance the rigidity. In addition, the entirety of the coupling member 86 is made of metal or the like. In this embodiment, metal is used which is preferable from the standpoint of downsizing of the coupling. More particularly, it is made of zinc die-cast alloy. Apart of the spherical surface of the connecting portion 86c is cut out at the portion close to the interconnecting portion 86g in the free end side 86a. In addition, the configuration of the coupling member is so designed that the total length including the first to third portions is not more than approx. 21 mm. A length from the pivoting center C to the free end portion engaging with the main assembly drive pin measured in the longitudinal direction is not more than 15 mm. With the decrease of the distance from the center of the pivoting of the coupling member, the distance through which the coupling retracts from the drive pins when the coupling inclines by the same angle decreases. In other words, if the coupling member is shortened for the purpose of downsizing of the cartridge, it is necessary to increase the pivotable angle required to escape from the drive pin. The free end portion 86a, the connecting portion 86c, and the interconnecting portion 86g may be integrally molded, or may be provided by connecting different parts. In the state that the photosensitive drum, the coupling member and the flange supporting the coupling member is taken out of the cartridge, the coupling member is inclinable in any inclining directions.
5. Structure of Drum Unit
Referring to
As shown in
The driving side flange unit U2 as a force receiving member to which the rotational force is transmitted from the coupling member is provided at the driving side end portion of the drum 62. More particularly, as shown in part (c) of
Here, the substantial co-axial means the completely co-axial and approximately coaxial in which they are slightly deviated due to the manufacturing tolerances of the parts. The same applies to the following descriptions.
Similarly, the non-driving side flange 64 is provided at the non-driving side end portion of the drum 62 substantially coaxially with the drum 62. In this embodiment, the non-driving side flange 64 is made of resin material. As shown in part (c) of
As shown in
In the non-driving side of the drum unit U1, a shaft receiving portion 64a (part (b) of
On the other hand, as shown in
In this embodiment, the bearing member 76 is fixed to the cleaning frame 71 by screws 90, but it may be fixed by bonding or by melted resin material. The cleaning frame 71 and the bearing member 76 may be made integral.
6. Driving Side Flange Unit
Referring to
As shown in
The driving side flange 87 receives the driving force from the pin 88 to transmit the rotational force to the drum 62. The closing member 89 as a regulating member functions to prevent disengagement of the coupling member 86 and the pin 88 for the driving side flange 87. By this, the coupling member 86 is capable of taking various attitudes relative to the driving side flange 87. In other words, the coupling member 86 is held pivotably about a pivoting center, so as to take a first attitude, a second attitude which is different from the first attitude or the like. As for the free end portion of the coupling member, it can take various positions (a position, a second position different from the first position).
As described in the foregoing, the driving side flange unit U2 comprises a plurality of members, and the driving side flange 87 as a first member and the closing member 89 as a second member are unified into a flange. The driving side flange 87 functions both to receive the drive from the pin 88 and to transmit the drive to the drum 62. On the contrary, the closing member 89 substantially out of contact to the inside of the drum and supports the pin 88 together with the driving side flange 87.
Referring to
As described hereinbefore, the coupling member 86 includes the free end portion 86a and the connecting portion 86c (accommodated portion). The connecting portion 86c is provided with a through hole portion 86b. The inside (inner wall) of the hole portion 86b has transmitting portions 86b1 and 86b2 for transmitting the rotational force to the pin 88. The inside (inner wall) of the hole portion 86b is also provided with first inclination-regulated portions 86p1 and 86p2 as inclination-regulated portions for being contacted by the pin 88 to limit the inclination amount of the coupling member 86 (also part (b2) of
The driving side flange 87 includes the fixed portion 87b, a first cylindrical portion 87j, an annular groove portion 87p and a second cylindrical portion 87h. The fixed portion 87b is fixed to the drum 62 to transmit the driving force by contacting to the inner surface of the cylinder of the drum 62. The second cylindrical portion 87h is provided inside the first cylindrical portion 87j in the radial direction, and the annular groove portion 87p is provided between the first cylindrical portion 87j and the second cylindrical portion 87h. The first cylindrical portion 87j is provided with a gear portion (helical gear) 87c on the radially outside, and is provided with a supported portion 87d on the radially inside (annular groove portion 87p side). The gear portion 87c is preferably a helical gear from the standpoint of drive transmission property, but a spur gear is usable. The second cylindrical portion 87h of the driving side flange 87 is hollow configuration and has a cavity as an accommodating portion 87i therein. The accommodating portion 87i accommodates the connecting portion 86c of the coupling member 86. In the driving side of the accommodating portion 87i, there is provided a conical portion 87k as the disengagement prevention portion (overhang portion) for limiting disengagement of the coupling member 86 toward the driving side, by contacting to the connecting portion 86c. More particularly, the conical portion 87k contacts to the outer periphery of the connecting portion 86c of the coupling member 86 to prevented the disengagement of the coupling member. More specifically, the conical portion 87k contacts to the substantially spherical portion of the connecting portion 86c to prevent the disengagement of the coupling member 86. Therefore, the minimum inner diameter of the conical portion 87k is smaller than the inner diameter of the accommodating portion 87i. In other words, the conical portion 87k overhangs from the inner surface of the accommodating portion 87i toward the axis center of the coupling member (hollow portion side) to contact to the peripheral surface of the connecting portion 86c to prevent the disengagement.
In this embodiment, the conical portion 87k as a center shaft coaxial with the axis L1, but may be a spherical surface or a crossing with the axis L1. The driving side of the conical portion 87k is provided with an opening 87m for projecting the free end portion 86a of the coupling member 86, and the diameter of the opening 87m (φZ10) is larger than the maximum rotation diameter φZ1 of the free end portion 86a. In a further driving side of the opening 87m, there is provided a second inclination regulating portion 87n as another inclination regulating portion contacting to the outer periphery of the coupling member 86 when the coupling member 86 is inclined (pivoted). More particularly, the second inclination regulating portion 87n contacts to the interconnecting portion 86g as a second inclination-regulated portion when the coupling member 86 is inclined. A gear portion 87c transmits the rotational force to the developing roller 32. The supported portion 87d is supported by a supporting portion 76a of the bearing member 76 (supporting member) and is provided on the back side of the gear 87c with respect to the thickness direction thereof. They are coaxial with the axis L1 of the drum 62.
The structure is such that when the coupling member 86 contacts the first inclination regulating portion an inclination angle is smaller than when the coupling member 86 contacts the second inclination regulating portion, as will be described hereinafter.
The accommodating portion 87i inside the second cylindrical portion 87h is provided with a pair of groove portions 87e (recesses) extending in parallel with the axis L1, at 1800 away from each other about the axis L1. The groove portion 87e opens toward the fixed portion 87b in the direction of the axis L1 of the driving side flange 87 and continues to the hollow portion 87i in the diametrical direction. The bottom portion of the groove portion 87e is provided with a retaining portion 87f which is a surface perpendicular to the axis L1. The recess 87e is provided with a pair of receiving portions 87g for receiving the rotational force from the pin 88, as will be described hereinafter. (at least a part of) the groove portion 87e and (at least a part of) the annular groove portion 87p overlap with each other in the axis L1 direction (part (b) of
The closing member 89 as the regulating member is provided with a conical base portion 89a, a hole portion 89c provided in the base portion 89a, and a pair of projected portions 89b at positions approx. 180° away from each other about the axis of the base portion. The projected portion 89b includes a longitudinal direction regulating portion 89b1 at a free end with respect to axis L1 direction.
In this embodiment, the driving side flange 87 is a molded resin material manufactured by injection molding, and the material thereof is polyacetal, polycarbonate or the like. The driving side flange 87 may be made of metal, depending on the load torque. In this embodiment, the driving side flange 87 is provided with a gear portion 87c for transmitting the rotational force to the developing roller 32. However, the rotation of the developing roller 32 by be effected not through the driving side flange 87. In such a case, the gear portion 87c may be omitted. The gear portion 87c is provided in the driving side flange 87 as in this embodiment, it is preferable that the gear portion 87c is integrally molded together with the driving side flange 87.
Referring to
As shown in
More specifically, it will suffice if the coupling member inclining toward the downstream with respect to the mounting direction cartridge inclines (retracts) more than toward the directions, and the recess may have an expanding shape. The shape of the retracted portion (receiving portion) is not limited to a groove, but it will suffice if it is a recess extending toward the downstream beyond the rotational axis of the flange, with respect to the cartridge mounting direction. The first projected portion 76j is provided in a radially inside portion with a hollow portion 76i for accommodating the coupling member 86, and the hollow portion 76i is spatially connected with the cut-away portion 76k the cut-away portion 76j1 provided in a part of the first projected portion 76j. The cut-away portion 76k as the retracted portion is provided downstream of the hollow portion 76i with respect to the mounting direction (X2) of the process cartridge B. Thus, when the cartridge is mounted to the main assembly, the coupling member 86 is retractable (greatly pivotable) into the cut-away portion 76k as the retracted portion.
In addition, the cylindrical supporting portion 76a enters the annular groove portion 87p of the driving side flange 87 to rotatably support the supported portion 87d.
Moreover, the first projected portion 76j is provided with a cylindrical portion 76d and a spring receiving portion 76e which function as a guided portion and a first positioned portion when the process cartridge B is mounted to the apparatus main assembly A. At a free end side of the cut-away portion 76k with respect to the mounting direction (X2), a free end portion 76f functioning as a second positioned portion is provided. The cylindrical portion 76d and the free end portion 76f and disposed at the positions different in the direction of the axis L1 with the plate-like portion 76h and the cut-away portion 76k therebetween, and have concentric arcuate configurations having different diameters.
In this embodiment, the first cylindrical portion 87j, the annular groove portion 87p, the second cylindrical portion 87h and the groove portion 87e are overlapping in the direction of the axis L1. Therefore, the supporting portion 76a of the bearing member 76 entering the annular groove portion 87p, the pin 88, the 86c1 of the coupling member 86 and the gear portion 87c are overlapping in the direction of the axis L1. As described hereinbefore, the bearing member 76 is provided with the cut-away portion 76k recessed toward the non-driving side beyond the plate-like portion 76h, and when the coupling member 86 is inclined (pivoted), a part of the coupling member 86 is accommodated in the cut-away portion 76k. With this structure of the parts around the coupling member 86, the inclination (pivoting) amount of the coupling member 86 can be made large assuredly, while reducing the amount of the projection of the bearing member 76 and/or the coupling member 86 toward the driving side as compared with the gear portion 87c. Here, overlapping means that when parts of an object are projected on an imaginary line, the parts are overlapped. In other words, an imaginary plane (reference plane) is determined, on which the parts are projected, and if the projected parts are overlapped on the imaginary plane, the parts are overlapped.
As shown in part (e) of
In this embodiment, the developing roller 32 pushes the drum 62 in the direction indicated by an arrow X7, as described hereinbefore. That is, the drum unit U1 urged toward the cut-away portion 76k. The cut-away portion side supporting portion 76aR of the supporting portion 76a supporting (the driving side flange 87 of) the drum unit U1 is provided with the cut-away portion 76k. The supporting portion 76aL in the opposite side not having the cut-away portion 76k has a higher rigidity than that of the cut-away portion side supporting portion 76aR. Therefore, in this embodiment, the supported portion 87d is provided on the back side of the gear portion 87c with respect to the thickness direction to receive the inner surface of the driving side flange 87. By doing so, the drum unit U1 is substantially supported by the opposite side supporting portion 76aL. That is, the cut-away portion side supporting portion 76aR having a less rigidity receive a smaller load so that the supporting portion 76a is not easily deformed.
As shown in
The first arm 91a of the torsion coil spring 91 contacts a spring receiving portion 76n of the bearing member 76, and the second arm 91b thereof contacts a connection 86g or a spring receiving portion 86h of the coupling member 86. By this, the torsion coil spring 91 urges by an urging force F1 such that the free end portion 86a of the coupling member 86 faces cut-away portion 76k side. A width Z11 of the cut-away portion 76k is larger than the diameter φZ of the free end portion 86a of the coupling member 86, and therefore, the free end portion 86a has latitude of movement up and down directions. The coil portion 91c of the torsion coil spring 91 is below the axis L1, and therefore, the free end portion 86a and coupling member 86 is urged downwardly by the urging force F1 and the gravity. By this, the axis L2 of the coupling member 86 inclines toward the cut-away portion 76k relative to the axis L1, and the free end portion 86a inclines to contact to the lower surface 76k1. In this embodiment, the free end portion 86a takes a position below the axis L1 by the urging force F1 of the torsion coil spring 91. As will be described hereinafter in conjunction with
As described above, the free end portion 86a of the coupling member 86 is inclined in the direction of approaching to the drive head 14, by the torsion coil spring 91. Depending on the mounting direction X2, the direction of gravity, the weight of the coupling member 86 or the like, the free end portion 86a of the coupling member 86 is directed in the X2 direction due to the weight of the coupling member. In such a case, the coupling member 86 may be directed toward the desired direction using the gravity without provision of the torsion coil spring 91 as the urging means (urging member). The coupling member 86 of this embodiment is urged by the torsion coil spring 91 to contact to the lower side surface of the cut-away portion 76k in the form of a groove. By this, the coupling member is sandwiched by the torsion coil spring and the lower side surface of the groove so that the attitude of the coupling member is stabilized. By properly arranging the torsion coil spring 91, for example, the coupling member may be contacted to the upper part surface of the cut-away portion 76k in the form of the groove configuration. However, the coupling attitude can be stabilized more in the case of using the gravity than in the case of using the urging force of the spring against the gravity.
Referring to
The position of the pin 88 in the longitudinal direction of the drum 62 (axis L1) is limited by the retaining portion 87f and the longitudinal direction regulating portion 89b1, and the position thereof in the rotational moving direction (R direction) of the drum 62 is limited by the receiving portion 87g. The pin 88 penetrates the hole portion 86b of the coupling member 86. The play between the hole portion 86b and the pin 88 is set so as to permit pivoting of the coupling member 86. With such a structure, the coupling member 86 is capable of inclining (pivoting, swing, whirling) in any directions relative to the driving side flange 87.
By the connecting portion 86c of the coupling member 86 contacting to the accommodating portion 87i, the movement of the driving side flange 87 in the radial direction is limited. By the connecting portion 86c contacting to the base portion 89a of the closing member 89, the movement from the driving side toward the non-driving side is limited. Furthermore, by the contact between the spherical 86c1 and the conical portion 87k of the driving side flange 87, the movement of the coupling member 86 from the non-driving side toward the driving side is limited. By the contact between the pin 88 and the transmitting portions 86b1, 86b2, the movement of the coupling member 86 in the rotational moving direction (R direction) is limited. By this, the coupling member 86 is connected with the driving side flange 87 and the pin 88.
Here, as shown in part (d) of
As described above, the position of the coupling member 86 in the axis L1 direction is limited by the contact to the base portion 89a or conical portion 87k, but because of the tolerances of parts, the coupling member 86 is made movable in the axis L1 direction through a small distance.
Referring to
As shown in part (a)
Then, as shown in part (a) of
As shown in part (b) of
In this embodiment, the diameter φZ1 of the free end portion 86a of the coupling member 86 is smaller than the diameter φZ10 of the opening 87m. By this, the coupling member 86, the pin 88 and the closing member 89 can all be assembled into the driving side, and therefore, the assembling is easy. In addition, the diameter φZ3 of the connecting portion 86c is smaller than the diameter of the opening 87m, by which the spherical surface portion 86c1 and the conical portion 87k can be contacted with each other. By this, the disengagement of the coupling member 86 toward the driving side can be prevented, and the coupling member 86 can be held with high precision. Because of the relationship of φZ1 (<φZ10)<φZ3, the driving side flange unit U2 can be easily assembled, and the position of the coupling member 86 can be maintained with high precision.
7. Inclining (Pivoting) Operation of Coupling
Referring to
Referring to
As shown in (a1) and (b1) of
As shown in (a2) and (b2) of
By combination of the inclination (pivoting) about the axis of the pin 88 and the inclination (pivoting) about the axis perpendicular to the axis of the pin 88, the coupling member 86 is capable of inclining (pivoting) in a direction different from those described above. Because the inclination (pivoting) in any directions are provided by the combination, the inclination (pivoting) angle in any direction is not less than first inclination angle θ1 and not more than second inclination angle θ2. In other words, the coupling is pivotable not less than the first inclination angle θ1 (first pivoting angle) and the second inclination angle (second pivoting angle)
In this manner, the coupling member 86 can incline (pivot) relative to the axis L1 substantially all directions. In other words, the coupling member 86 can incline (pivot) relative to the axis L1 in any directions. That is, the coupling member 86 can swing relative to the axis L1 in any directions. Further, the coupling member 86 can whirl relative to the axis L1 in any directions. Here, the whirling of the coupling member 86 is revolving of the inclined (pivoted) axis L2 around the axis L1.
As described above, the arcuate surface portions 86q1 and 86q2 determine the first inclination angle θ1, and the interconnecting portion 86g has a dimension determining the second inclination angle θ2. Therefore, the diameters of the interconnecting portion 86g and the arcuate surface portions 86q1 and 86q2 may be different from each other, although they are the same in this embodiment.
8. Driving Portion of the Apparatus Main Assembly
Referring to
The cartridge driving portion comprises a drive head 14 as the main assembly side engaging portion, a first side plate 350, a holder 300, a driving gear 355 and so on.
As shown in part (b) of
As shown in part (b) of
As shown in
As shown in
9. Mounting of Process Cartridge to Apparatus Main Assembly
Referring to
Part (a) of
In (a1) of the
As shown in
As shown in
As shown in
Thereafter, the process cartridge B is mounted to a predetermined position (mounting completed position) (
At this time, the operating portion 356a of the pulling spring 356 presses the spring receiving portion 76e of the process cartridge B in the arrow J direction in the Figure to assure the contact between the first arcuate portion 76d and the first guiding member 12a and the contact between the leading end portion 76f and the mounting end portion 12c. By this, the process cartridge B is correctly positioned relative to the apparatus main assembly A.
When the process cartridge B is mounted to the apparatus main assembly A, the coupling member 86 is engaged with the drive head 14 as the main assembly side engaging portion (
As shown in (a1) and (b1) of
When the inclination (pivoting) of the coupling member 86 is not limited, one of the claw portions 86d1 and 86d2 constituting the pair may not contact the drive pin 14b. In such a case, the above-described couple of forces is not supplied with the result of incapability of aligning the axis L2 of the coupling member 86 with the axis L3 of the drive head 14.
The coupling guide 300b1 does not interfere with the coupling member 86 in the mounting and demounting process of the process cartridge B even when the coupling member 86 is in a inclined (pivoted) state. To accomplish this, the coupling guide 300b is provided in a non-driving side of the free end portion 86a ((a3) and (b3) of
In this embodiment, the inclination (pivoting) of the coupling member 86 by the torsion coil spring 91 is limited by the coupling guide 300b. However, as described above, the inclination (pivoting) of the coupling member 86 may be effected by another means other than the torsion coil spring 91. For example, when the coupling member 86 inclines by the weight thereof, the coupling guide 300b may be disposed at a lower side. As described above, the coupling guide 300b may be provided at a position where the inclination (pivoting) of the coupling member 86 is limited in the mounting of the process cartridge B.
10. Engagement and Disengagement of Coupling in Dismounting Operation of Process Cartridge.
Referring to
The description will be made as to an example of this embodiment, in which the claw portions 86d1 and 86d2 of the coupling member 86 are in the upstream and downstream positions, respectively, with respect to the dismounting direction, as shown in
The process cartridge B is moved in the dismounting direction (X3 direction) from the state shown in parts (a1) and (b1) in which the coupling member 86 is engaged with the drive head 14. Then, as shown in (a2) and (b2) of
When the process cartridge B is further moved in the dismounting direction (X3 direction), the coupling member 86 is disengaged from the drive head 14 as the main assembly side engaging portion, as shown in (a3) and (b3) of
By the contact between the second inclination regulating portion 87n and in the interconnecting portion 86g the inclination (pivoting) of the coupling member 86 is limited. The maximum rotation diameter φZ2 of the interconnecting portion 86g and the second inclination angle θ2 are determined so that the coupling member 86 can incline (pivot) to such an extent that the upstream claw portion 86d1 with respect to the dismounting direction can be positioned in the non-driving side beyond the free end portion 14d of the drive head 14. By doing so, as shown in (a4) and (b4) of
In the case that the claw portions 86d1 and 86d2 are in the phase other than that described above, the coupling member 86 circumvents the parts of the drive head 14 as the main assembly side engaging portion by the inclination (pivoting) and/or the above-described whirling, or by a combination of these motions. By the circumventing motion, the coupling member 86 can be disengaged from the drive head 14 as the main assembly side engaging portion. As shown in (a1) and (b1) of
Dimensions of the parts in this embodiment will be described.
As shown in
In this embodiment, φZ1=10 mm, φZ2=5 mm, φZ3=11 mm, φZ4=7 mm, Z5=8.6 mm, SφZ7=6 mm, θ1=30°, θ2=40° and S=0.15 mm.
These dimensions are examples and are not restrictive to the present invention, if the similar operations are possible. More specifically, it will suffice if θ1 and θ2 are not less than approx. 20° and not more than approx. 60°. Preferably, they are not less than 25° and not more than 45°. Further preferably, θ1<θ2 is satisfied, and θ1 this not less than approx. 20° and not more than approx. 35°, and θ2 is not less than approx. 30° and not more than approx. 60°. The difference between θ1 and θ2 is not less than approx. 3° and not more than approx. 20°, and preferably, it is not less than approx. 5° and not more than approx. 15°. It will be considered to design the angles θ1 and θ2 such that as shown in
By satisfying φZ1<φZ3, the assembling is easy as in this embodiment. Furthermore, by satisfying φZ1<φZ10<φZ3 taking into account the minimum diameter φZ10 of the conical portion 87k as the disengagement prevention portion (overhang portion, disengagement preventing portion), the position of the coupling member 86 in the driving side flange unit U2 can be determined with high precision.
According to this embodiment, the conventional cartridge which can be dismounted to the outside of the main assembly after being moved in the predetermined direction substantially perpendicular to the rotational axis of the main assembly side engaging portion can be further improved.
This embodiment will be described in conjunction with the accompanying drawings. In this embodiment, the structures of the parts other than a free end portion 286a of a coupling member 286, a drive head 214 and a coupling guide 400b are similar to those of the first embodiment, and therefore, the description of such other parts is omitted by assigning the same reference numerals as in the first embodiment. Even if the same reference numerals are assigned, the parts may be partly modified so as to match the structure of this embodiment.
As shown in
On the other hand, the drive head 214 is provided at a base portion of the drive pin 214b with a receiving spherical surface portion 214c and a recess 214e recessed from the drive shaft 214a in a downstream side of the drive pin 214b with respect to the rotational moving direction (R direction).
Referring to
As shown in (a1) of
From the state, the cartridge B is moved in the dismounting direction (X3 direction the, and shown in (a2) and (b2) of
The cartridge B is further moved in the dismounting direction (X3 direction), as shown in (a3) and (b3) of
At this time, since the drive head 214 is provided with the cut-away portion 214e, the coupling member 286 inclines (pivots) in the direction of an arrow X5 so that the claw portions 286d1 and 286d2 move along the drive pins 214b and 214b2.
As shown in (a4) and (b4) of
In this embodiment, as compared with Embodiment 1, the widths Z21 of the receiving portions 286e1 and 286e2 are larger. More specifically, the width of the base portion is approx. 1.5 mm. With such a structure, the engagement amount Z23 (part (d) of
The cut-away portion 214e is desired to be enough to permit disengagement between the coupling member 286 and the drive head 214 even when the engagement amount Z23 is larger than the gap between the inner diameter φZ24 of the claw portion and the diameter φZ27 of the cylindrical portion of the drive head 214. Therefore, it is provided so as to permit large inclination (pivoting) of the coupling member 86 in the direction of the arrow X5. Here, the large inclination means that the claw portions 286d1 and 286d2 cam move toward the drive pins 214b1 and 214b2 through a distance larger than the engagement amount Z23.
Referring to
As shown in (a1) and (b1) of
As described above, the engagement amount Z23 between the drive pin 214b1, 214b2 and in the claw portion 286d1, 286d2 is increased, and the drive head 214 is provided with the cut-away portion 214e. By doing so, when the cartridge B is dismounted from the apparatus main assembly A, the engagement between the coupling member 286 and the drive head 214 can be released. In addition, with the structure of this embodiment, the gap S2 between the coupling guide 400b and the interconnecting portion 286g can be increased as compared with Embodiment 1, by which the required part accuracy can be eased.
A third embodiment of the present invention will be described.
The coupling member 386 is provided with lightening portions 386c2-386c9 in a connecting portion 386c as is different from Embodiment 1 and Embodiment 2. A diameter of an interconnecting portion 386g is small, and a thickness defined by a spring receiving portion 386h and a receiving surface 386f is small. By this, the material can be saved.
In providing the lightening portions 386c2-386c9, it is preferable that the spherical 386c1 remains evenly along the circumferential direction. In this embodiment, the connecting portion 386c is construct in such that the void of the spherical portion 386c1 provided by the lightening portions 386c2-386c9 and the hole portion 386b is less than continuously 90°. The spherical portion may be substantially spherical in consideration of the lightening and/or manufacturing variation or the like. With the above-described structure of the connecting portion 386c, the position of the coupling member 86 in the driving side flange unit U32 can be stabilized. Particularly, the position of the coupling member can be stabilized at the position of the line S14-S14 supported by the accommodating portion 87i and at the position opposing to the conical portion 87k and the base portion 89a, as shown in part (c) of
An arcuate surface portion 386q1 and an arcuate surface portion 386q2 have diameters different from each other.
As shown in
As shown in
On the other hand, as shown in part (b) of
The diameter of the free end of the guide portion 330b2 of the coupling guide 330b shown in
Referring to
A spring hook portion 376g comprises a retaining portion 376g1, an insertion opening 376g2 and a supporting portion 376g3. The insertion opening 376g2 and the supporting portion 376g3 are connected with each other by a tapered portion 376g4 so that the spring 91 can be smoothly slipped in the direction of an arrow X10. The most outer diameter Z33 of the retaining portion 376g1 and the insertion opening 376g2 and the most outer diameter of the supporting portion 376g3 are smaller than the inner diameter φZ35 of the coil portion 91c of the spring 91. With the above-described structure of the spring hook portion 376g, the coil portion 91c can be easily slipped around the spring hook portion 376g, and the movement of the coil portion 91c in the direction of disengagement from the retaining portion 376g1 by the supporting portion 376g3 can be suppressed. By this, the possibility of the disengagement of the spring 91 from the spring hook portion 376g can be reduced. The spring hook portion 376g does not project beyond the first projected portion 376j outwardly (driving side), so that the possibility of the damage of the spring hook portion 376g during the transportation is reduced.
In this embodiment, it is preferable that the retaining portion 376g1 is disposed in the side opposite from the spring hook portion 376g across the coupling member 386 (lower left side in part (a) of
To described briefly, a reaction force received by the torsion coil spring 91 (a resultant force of a force F91a received by the first arm 91a and a force F91b received by the second arm 91b) directs toward the coupling member 386 side (upper right side in part (a) of
The bearing member 376 is provided with a contact prevention rib 376j5 and a contact prevention surface 376j2 in order to prevent contact of the coupling member 386 to the coil portion 91c. By this, even when the coupling member 386 inclines close to the coil portion 91c, the coupling member 386 contacts to the contact prevention rib 376j5, the contact prevention surface 376j2, so that the contact of the free end portion 386a to the coil portion 91c is prevented. By this, the possibility of the disengagement of the coil portion 91c from the retaining portion 376g1 can be suppressed.
Furthermore, radially inside of the first projected portion 376j, a space 376j4 is provided to permit movement of the second arm of the spring 91. Here, the second arm 91b has such a length that an arm portion 91b1 of the second arm 91b can be always contacted to the spring receiving portion 386h (
In this embodiment, the disengagement prevention of the torsion coil spring 91 it is effected by the configuration of the spring hook portion 376g, but may be effected using application of silicon bond or hot melt. Alternatively, another resin material member may be used for the prevention of the disengagement.
Referring to
As shown in
Referring to
As shown in
In Embodiment 1, the supported portion 87d is provided on an inner circumference of the first cylindrical portion 87j of the driving side flange 87, but in this embodiment, the outer peripheral surface of the second cylindrical portion 587h is used as the supported portion 587d. In one of the bearing members 576, a supporting portion 576a as the second projected portion enters a groove portion 587p to support the supported portion 587d. The second cylindrical portion 587h is projected more toward the driving side than the first cylindrical portion 587j, and therefore, by the provision of the supported portion 587d on the second cylindrical portion 587, the supporting length in the axis L1 direction can be increased as compared with the case in which the supported portion is provided on the first cylindrical portion 587j.
In the foregoing embodiments, the coupling member is accommodated in the flange unit of the photosensitive drum, but this is not inevitable, and it will suffice if the drive is received by the cartridge through the coupling member. More particularly, the structure may be that a developing roller is rotated through a coupling member. The present invention is suitably applicable to a developing cartridge not comprising a photosensitive drum in which the rotational force is transmitted from the main assembly side engaging portion to the developing roller. In such a case, the coupling member 86 transmits the rotational force to the developing roller 32 as the rotatable member in place of the photosensitive drum.
The present invention is applicable to the structure in which the driving force is transmitted to the photosensitive drum only. In the foregoing embodiments, the driving side flange 87 as the force receiving member is fixed to a longitudinal end portion of the drum 62 which is the rotatable member, the driving side flange 87 may be an independent part not fixed thereto. For example, it may be a gear member with which the driving force is transmitted to the drum 62 and/or to the developing roller 32 through a gear connection.
In the foregoing embodiments, the cartridge B is for forming monochromatic images. However, this is not inevitable. The structures and concept of the above-described embodiments are suitably applicable to a cartridge for forming multi-color images (two-color images, or full-color images, for example) using a plurality of developing means.
A mounting-and-demounting path of the cartridge B relative to the apparatus main assembly A may be a linear path, a combination of linear paths or curved path, and the structures of the above-described embodiments can be used in such cases.
The structures of the foregoing embodiments can be applied to a cartridge usable with an electrophotographic image forming apparatus and a drive transmission device for them.
Number | Date | Country | Kind |
---|---|---|---|
2013-188917 | Sep 2013 | JP | national |
2014-183708 | Sep 2014 | JP | national |
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Number | Date | Country | |
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20230324846 A1 | Oct 2023 | US |
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Parent | 17504626 | Oct 2021 | US |
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Child | 17504626 | US | |
Parent | 16052060 | Aug 2018 | US |
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Number | Date | Country | |
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Parent | PCT/JP2014/074754 | Sep 2014 | WO |
Child | 15052192 | US |