CN107831645B - Rotational driving force receiving member, driving assembly, and cartridge - Google Patents
Rotational driving force receiving member, driving assembly, and cartridge Download PDFInfo
- Publication number
- CN107831645B CN107831645B CN201711345885.9A CN201711345885A CN107831645B CN 107831645 B CN107831645 B CN 107831645B CN 201711345885 A CN201711345885 A CN 201711345885A CN 107831645 B CN107831645 B CN 107831645B
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- engagement
- receiving member
- force receiving
- rotational
- driving force
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1642—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements for connecting the different parts of the apparatus
- G03G21/1647—Mechanical connection means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
- G03G15/757—Drive mechanisms for photosensitive medium, e.g. gears
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1803—Arrangements or disposition of the complete process cartridge or parts thereof
- G03G21/1814—Details of parts of process cartridge, e.g. for charging, transfer, cleaning, developing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1839—Means for handling the process cartridge in the apparatus body
- G03G21/1842—Means for handling the process cartridge in the apparatus body for guiding and mounting the process cartridge, positioning, alignment, locks
- G03G21/1853—Means for handling the process cartridge in the apparatus body for guiding and mounting the process cartridge, positioning, alignment, locks the process cartridge being mounted perpendicular to the axis of the photosensitive member
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1839—Means for handling the process cartridge in the apparatus body
- G03G21/1857—Means for handling the process cartridge in the apparatus body for transmitting mechanical drive power to the process cartridge, drive mechanisms, gears, couplings, braking mechanisms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1839—Means for handling the process cartridge in the apparatus body
- G03G21/1857—Means for handling the process cartridge in the apparatus body for transmitting mechanical drive power to the process cartridge, drive mechanisms, gears, couplings, braking mechanisms
- G03G21/186—Axial couplings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Electrophotography Configuration And Component (AREA)
Abstract
The present invention relates to a rotational driving force receiving member having a spherical concave surface formed on an axially outer side of an engagement head portion thereof and at least one engagement claw protruding from the engagement head portion in an axial direction thereof, a driving assembly, and a cartridge; wherein the engagement claw has a first engagement surface and a second engagement surface, the second engagement surface being located outside the first engagement surface in a radial direction of the rotational driving force receiving member and located on an upstream side of the first engagement surface in a rotational direction of the rotational driving force receiving member; and wherein a first angle between the first engagement surface and the rotational axis of the rotational drive force receiving member is smaller than a second angle between the second engagement surface and the rotational axis of the rotational drive force receiving member. The rotational driving force receiving member of the present invention is capable of stably receiving driving force from a driving shaft even when the state of the driving shaft in an electrophotographic image forming apparatus main body is changed due to long-term use or the like.
Description
Technical Field
The present invention relates to the field of electrophotographic imaging apparatuses; and more particularly, to a rotational driving force receiving member for receiving driving force from an electrophotographic image forming apparatus main body, a driving assembly including the same, and a cartridge detachably mounted in the electrophotographic image forming apparatus main body.
Background
An electrophotographic image forming apparatus such as a laser printer is based on the principle that a photosensitive member such as a photosensitive drum is uniformly charged first, then the photosensitive member is exposed to a laser beam so that the charge of an irradiated portion of the surface of the photosensitive member disappears, an electrostatic latent image is formed while an unirradiated portion still carries the charge, then toner is supplied to the surface of the photosensitive member by a developing roller to develop the electrostatic latent image, and finally the toner on the surface of the photosensitive member is transferred to a printing medium and fixed by heating, thereby forming a stable image on the printing medium.
The photosensitive drum and/or the developing roller and its peripheral process members/devices are generally integrated in a cartridge detachably mounted to the main body of the electrophotographic image forming apparatus, and such a cartridge can be provided in various ways. For example, a photosensitive drum, a charging device and a cleaning device acting on the photosensitive drum, a developing roller, and a powder feeding roller and a powder feeding scraper acting on the developing roller are integrated into one cartridge to form an integral cartridge; the photosensitive drum, a charging device acting on the photosensitive drum and a cleaning device are integrated together to form a drum cartridge, and a developing roller, a powder feeding roller acting on the developing roller and a powder feeding scraper are integrated together to form a developing cartridge. No matter how the cartridge is provided, since the developing roller and/or the photosensitive drum and the like are contained therein, which are required to rotate during operation, it is necessary to receive a rotational driving force from the electrophotographic image forming apparatus main body.
Chinese patent document CN102067044a discloses an electrophotographic image forming apparatus and a process cartridge detachably mounted in the main body of the electrophotographic image forming apparatus; the electrophotographic image forming apparatus main body has therein a drive shaft 100 as shown in fig. 1, a free end portion 100a of the drive shaft 100 having a substantially spherical surface, and a rotational force transmitting pin 100b as a rotational force applying portion. The process cartridge has a photosensitive drum assembly 21 as shown in fig. 2, which includes a photosensitive drum 20 and a coupling assembly 156 (driving assembly) provided at an axial end of the photosensitive drum 20, the coupling assembly 156 having a universal joint type coupling member 150 (rotational driving force receiving member) for engaging with a driving shaft 100 in an electrophotographic image forming apparatus main body, the coupling member 150 being inclined to one side with respect to an axial direction of the photosensitive drum 20 to avoid interference with the driving shaft 100 when the process cartridge is mounted in or dismounted from the electrophotographic image forming apparatus main body. The coupling member 150 is coupled with the driving shaft 100 to receive driving force to rotate the photosensitive drum, and then transmits the driving force to the other process members through a gear set or the like. However, the universal joint type coupling member 150 is easily separated from the coupling assembly 156, and thus the driving force is not stably transmitted.
In some cases, the rotational driving force receiving member is configured to be reciprocally movable along the rotational axis thereof, in response to the problem that the universal joint type rotational driving force receiving member is liable to come off. Wherein the rotational driving force receiving member abuts against a driving shaft in the electrophotographic image forming apparatus when the cartridge is mounted or dismounted, moves toward the inside of the cartridge along its rotational axis to avoid interference with the driving shaft, and moves toward the outside of the cartridge and engages with the driving shaft by means of a spring or air pressure when the cartridge is mounted in place. Chinese patent document CN102096352a discloses an example of such a cartridge, in which the distal end of the rotational driving force receiving member is integrally formed with two engaging claws. However, since the axial movement of the rotational driving force receiving member is limited by other structures in the electrophotographic image forming apparatus, and the two engaging claws are fixedly provided, the cartridge is not easily detached smoothly. If the cartridge is forcibly loaded or unloaded, there is a risk that the engagement of the rotational driving force receiving member and the drive shaft becomes unstable, and the driving force cannot be stably transmitted.
To solve this problem, chinese patent document CN106444321a discloses a drive assembly including a cylindrical member and a coupling member coaxially disposed, and a developing cartridge; the cylinder part and the connecting part are respectively provided with an acting force device, the connecting part comprises a sleeve and a guide rod which are coaxially arranged, the end part of the guide rod is provided with two engaging claws, and the maximum deflection angle of the engaging claws limited by the sleeve relative to the axis of the guide rod is increased along with the outward axial movement of the guide rod, and the outward protruding distance of the engaging claws along the axial direction of the guide rod is reduced. When the developing cartridge is detached from the main body of the electrophotographic image forming apparatus, the engaging claw moves relative to the driving shaft, and the driving shaft forces the engaging claw to deflect, so that the engaging claw can be prevented from interfering with the driving shaft, and the detachment of the developing cartridge is facilitated.
However, the present inventors have found that, since the electrophotographic image forming apparatus main body has a service life far longer than that of the cartridge, when the state of the drive shaft in the electrophotographic image forming apparatus main body is changed due to long-term use or the like, each of the cartridges disclosed in the above patent documents has a problem in that the rotational drive force receiving member cannot stably receive the drive force from the drive shaft.
Disclosure of Invention
A main object of the present invention is to provide a rotational driving force receiving member capable of stably receiving driving force from a driving shaft even when the state of the driving shaft in an electrophotographic image forming apparatus main body is changed due to long-term use or the like.
Another object of the present invention is to provide a driving assembly which is not only easily detachable from an electrophotographic apparatus main body, but also is capable of stably receiving a driving force from a driving shaft.
A third object of the present invention is to provide a cartridge comprising the above-described drive assembly.
In order to achieve the above-described main object, a first aspect of the present invention provides a rotational driving force receiving member having a spherical concave surface formed on an axially outer side of an engagement head portion thereof and at least one engagement claw protruding from the engagement head portion in an axial direction thereof; wherein the engagement claw has a first engagement surface and a second engagement surface, the second engagement surface being located outside the first engagement surface in a radial direction of the rotational driving force receiving member and located on an upstream side of the first engagement surface in a rotational direction of the rotational driving force receiving member; and wherein a first angle between the first engagement surface and the rotational axis of the rotational drive force receiving member is smaller than a second angle between the second engagement surface and the rotational axis of the rotational drive force receiving member.
According to a preferred embodiment of the invention, the first angle is greater than 0 ° and less than 45 °, and the second angle is greater than 15 ° and less than 60 °. More preferably, the first included angle is greater than 10 ° and less than 40 °, and the second included angle is greater than 25 ° and less than 60 °; further preferably, the first included angle is greater than 15 ° and less than 30 °, and the second included angle is greater than 35 ° and less than 50 °.
According to another preferred embodiment of the invention, the ratio of the second angle to the first angle is greater than 1.5 and less than 2.5; more preferably, the ratio of the second angle to the first angle is greater than 1.5 and less than 2.0.
According to still another preferred embodiment of the present invention, the number of the engaging claws is two, and the two engaging claws are arranged at regular intervals in the circumferential direction of the engaging head.
In the present invention, the engagement claw may be provided so as to be deflectable with respect to the engagement head as disclosed in CN106444321a, or may be fixedly connected with the engagement head (e.g., the engagement claw is integrally formed with the engagement head) as disclosed in CN102096352 a.
To achieve the above another object, a second aspect of the present invention provides a driving assembly comprising:
a cylindrical member, the outer wall of which is provided with a gear;
a rotational driving force receiving member reciprocally movably provided in an axial direction of the cylindrical member;
wherein the rotational driving force receiving member includes:
a sleeve having a connecting end located inside the cylindrical member and an engagement head located outside the cylindrical member, the engagement head having a spherical concave surface formed on an axially outer side thereof and a limit groove extending radially inward to the spherical concave surface;
the guide rod is arranged in the axial direction of the sleeve in a reciprocating manner and is provided with a first end positioned in the inner cavity of the sleeve and a second end capable of extending out of the inner cavity of the sleeve;
a biasing force applying member provided in the sleeve for applying a force to the guide rod away from the engagement head;
an engaging claw pivotably connected to the second end of the guide rod and protruding from the engaging head portion from the limit groove in the axial direction of the sleeve;
wherein the engagement claw has a first engagement surface and a second engagement surface, the second engagement surface being located outside the first engagement surface in a radial direction of the rotational driving force receiving member and located on an upstream side of the first engagement surface in a rotational direction of the rotational driving force receiving member; and wherein a first angle between the first engagement surface and the rotational axis of the rotational drive force receiving member is smaller than a second angle between the second engagement surface and the rotational axis of the rotational drive force receiving member.
In a preferred embodiment of the above drive assembly, the first included angle is greater than 0 ° and less than 45 °, and the second included angle is greater than 15 ° and less than 60 °. More preferably, the first included angle is greater than 10 ° and less than 40 °, and the second included angle is greater than 25 ° and less than 60 °; further preferably, the first included angle is greater than 15 ° and less than 30 °, and the second included angle is greater than 35 ° and less than 50 °.
In another preferred embodiment of the above drive assembly, the ratio of the second angle to the first angle is greater than 1.5 and less than 2.5; more preferably, the ratio of the second angle to the first angle is greater than 1.5 and less than 2.0.
In still another preferred embodiment of the above-described drive assembly, the number of the engaging claws is two, and the two engaging claws are arranged at regular intervals in the circumferential direction of the engaging head.
In order to achieve the third object described above, a third aspect of the present invention provides a cartridge detachably mountable to an electrophotographic image forming apparatus main body, including a developing roller and/or a photosensitive drum, and any one of the driving assemblies described above; wherein the driving assembly receives a rotational driving force from the electrophotographic image forming apparatus main body and directly or indirectly drives the developing roller and/or the photosensitive drum to rotate.
The present invention will be described in further detail with reference to the drawings and the detailed description, for the purpose of more clearly illustrating the objects, technical solutions and advantages of the present invention.
Drawings
Fig. 1 is a structural view of a drive shaft in a main body of a conventional electrophotographic image forming apparatus;
FIG. 2 is a block diagram of a prior art photosensitive drum assembly;
FIGS. 3a-d are schematic views showing a process of disengaging a rotational force transmitting pin of an engaging claw and a driving shaft in a conventional cartridge when the cartridge is detached from a main body of an electrophotographic image forming apparatus;
FIG. 4a is a schematic view showing an engaged state between an engaging claw and a rotational force transmitting pin in a prior art cartridge when the rotational force transmitting pin of a drive shaft is in a normal state;
FIG. 4b is a schematic view showing an engaged state between an engaging claw and a rotational force transmitting pin in a prior art cartridge when the rotational force transmitting pin of a drive shaft is in an abnormal state;
FIG. 5 is an exploded view of an embodiment of the drive assembly of the present invention;
FIG. 6 is a cross-sectional view of the drive assembly shown in FIG. 5;
fig. 7 is a perspective view of a rotational driving force receiving member of the driving assembly shown in fig. 5;
fig. 8 is an exploded view of the rotary drive force receiving member of the drive assembly of fig. 5;
fig. 9 is a perspective view of an engagement claw in the rotational driving force receiving member shown in fig. 7;
fig. 10 is a side view of the engagement claw in the rotational driving force receiving member shown in fig. 7.
Detailed Description
In order to facilitate understanding of the present invention, a description will be first given of a disengagement process between the engagement claw and the rotational driving force transmitting pin when the cartridges disclosed in CN102096352a and CN106444321a are taken out of the electrophotographic image forming apparatus main body.
Fig. 3a to 3D schematically illustrate a disengagement process between the engagement claw 11 'of the rotational driving force receiving member 10' and the rotational driving force transmitting pin 100a of the driving shaft in the main body of the electrophotographic image forming apparatus during the removal process of the cartridge disclosed in CN102096352a and CN106444321a, wherein the rotational driving force transmitting pin 100a is substantially perpendicular to the removal direction D of the cartridge.
In the case where the rotational driving force transmitting pin 100a is substantially perpendicular to the taking-out direction D of the cartridge, although the rotational driving force receiving member 10' can be moved to some extent toward the inside of the cartridge by the driving shaft when the cartridge is taken out, it is generally necessary to rotate the cartridge to some extent in the direction about the axis of the rotational driving force receiving member 10' as shown in fig. 3a-D so that the engaging claw 11' is smoothly disengaged from the rotational driving force transmitting pin 100 a. But is limited to the installation space within the main body of the electrophotographic image forming apparatus, the angle at which the cartridge is rotatable in the direction about the axis of the rotational driving force receiving member 10' is limited.
As can be seen from fig. 3a-d, when the angle θ of the engagement surface 111 'of the engagement claw 11' with the rotational axis of the rotational driving force receiving member 10 'is larger, the smaller the angle the cartridge needs to be rotated around the rotational driving force receiving member 10' during the process of taking out the cartridge, thereby facilitating the taking out of the cartridge. However, as shown in fig. 3a, as the angle θ of the engagement surface 111' of the engagement claw 11' with the rotational axis of the rotational driving force receiving member 10' is smaller, the torque applied to the engagement claw 11' by the rotational driving force transmitting pin 100a is larger, so that the engagement claw 11' can receive the driving force from the drive shaft more stably.
Therefore, in the related art, the angle θ between the engagement surface 111' and the rotation axis of the rotational driving force receiving member 10' is set within an appropriate range, so that the engagement claw 11' can stably receive the driving force from the drive shaft, and the cartridge is also easy to take out.
However, the present inventors found that even if the angle θ between the engagement surface 111 'and the rotational axis of the rotational driving force receiving member 10' is set reasonably, in practice, the rotational driving force receiving member 10 'and the drive shaft may not be stably engaged in some cases, and even a phenomenon occurs in which the rotational driving force transmitting pin 100a and the engagement claw 11' are disengaged from each other to slip.
Through an in-depth analysis of the above-described problems, the present inventors have found that the reason why the mutual disengagement between the rotational driving force transmitting pin 100a and the engaging claw 11 'occurs is that the rotational driving force transmitting pin 100a is changed in position on its axis due to loosening, so that only one engaging claw 11' can be engaged with the rotational driving force transmitting pin 100a at the beginning of the cartridge operation, and further that the rotational driving force receiving member 10 'and/or the drive shaft is swung with respect to its rotational axis due to the unbalance of the force, eventually resulting in both engaging claws 11' being disengaged from the rotational driving force transmitting pin 100 a.
In this regard, description will be given with reference to fig. 4a and 4b, fig. 4a and 4b being schematic views showing the engagement state between the engagement claw 11 'and the rotational force transmitting pin 100a when viewed from the axial direction perpendicular to the driving force receiving member 10'. Referring first to fig. 4a, in which the rotational driving force transmitting pin 100a is in a correct position, both ends thereof are engaged with the respective engaging claws 11', and torques T1 equal in magnitude and opposite in direction are applied to the two engaging claws 11', respectively, so that the rotational driving force receiving member 10' is normally rotated, whereby the rotational driving force can be stably transmitted.
Referring next to fig. 4b, in which the rotational driving force transmitting pin 100a moves along its axis due to loosening, the relative position of the driving shaft 100 and the rotational driving force transmitting pin 100a changes, only one end portion of the rotational driving force transmitting pin 100a can be engaged with the engaging claw 11' to apply the torque T1 thereto while the spherical free end of the driving shaft 100 is in contact with the spherical concave surface of the rotational driving force receiving member 10' to generate the torque T2, and the torque T2 is much smaller than the torque T1, thereby causing the rotational driving force receiving member 10' to oscillate with respect to its rotational axis due to the force imbalance; accordingly, the drive shaft 100 also swings with respect to the rotational axis thereof due to the reaction force of the rotational drive force receiving member 10', eventually causing both engagement claws 11' to disengage from the rotational drive force transmitting pin 100 a.
Based on the above findings, the present inventors have proposed an improved rotational driving force receiving member, driving assembly, and cartridge. The cartridge of the present invention may be an integrated cartridge in which a photosensitive drum, a charging device and a cleaning device which act on the photosensitive drum, a developing roller, and a toner feeding roller and a toner feeding blade which act on the developing roller are integrated into one cartridge, or may be a cartridge in which a photosensitive drum, a charging device and a cleaning device which act on the photosensitive drum are integrated, or may be a developing cartridge in which a developing roller, a toner feeding roller and a toner feeding blade which act on the developing roller are integrated. Whichever integration is used in the cartridge of the present invention, it differs from existing cartridges primarily in the drive assembly and rotational drive force receiving members therein. Therefore, only the structures of the driving unit and the rotational driving force receiving member of the cartridge in the present invention will be described below.
Fig. 5 is a structural exploded view as an embodiment of the driving assembly of the present invention, fig. 6 is a sectional view thereof, and fig. 7 and 8 are structural exploded views in which the rotational driving force receiving member.
Referring to fig. 5 to 8, the driving assembly 10 includes a rotational driving force receiving member 2 and a cylindrical member 1 having a gear provided on an outer wall thereof; wherein the rotational driving force receiving member 2 is reciprocally movably provided in the axial direction of the cylindrical member 1 and protrudes outside the cylindrical member 1 in the axial direction.
The rotational driving force receiving member 2 includes a guide rod 22, a sleeve 3, two engagement claws 21, and a spring 23 as biasing force applying means, which are coaxially disposed. Wherein the connecting end of the sleeve 3 is provided with a stopper tip 33 for restricting displacement of the rotational driving force receiving member 2 in the axially outer direction, and a spring 31 as a biasing force applying means is provided in the cylindrical member 1, the spring 31 applying an axially outward (i.e., toward the engagement head 32) force to the sleeve 3; the outer wall of the sleeve 3 is provided with a limit projection 35, and the axially outer end of the cylindrical member 1 is provided with a limit cap 12, and the limit projection 35 is matched with the limit cap 12 to prevent the rotational driving force receiving member 2 from being removed from the cylindrical member 1.
The sleeve 3 further has a connecting end located inside the cylindrical member 1 and an engaging head 32 located outside the cylindrical member 1, the engaging head 32 having a spherical concave surface 321 (including a paraboloid or cambered surface like a sphere in the present invention) formed on the axially outer side thereof, and two stopper grooves 322 extending radially inward thereof to the spherical concave surface 321, the two stopper grooves 322 being disposed at regular intervals in the circumferential direction of the engaging head 32.
The guide rod 22 is arranged in a reciprocating manner along the axial direction of the sleeve 3 and is provided with a first end positioned in the inner cavity of the sleeve 3 and a second end capable of extending out of the inner cavity of the sleeve 3; the second end is provided with a pivot 24 perpendicular to the axis of the guide bar 22, and two engagement claws 21 are rotatably mounted at the second end of the guide bar 22 about the pivot 24 and protrude from the limit groove 322 to the engagement head 32 in the axial direction of the sleeve 3. The engagement head 32 may also limit the maximum deflection angle of the engagement claw 21 to some extent, thereby limiting the axial protruding distance of the engagement claw 21.
The guide rod 22 is provided at a first end thereof with a closing tip 25 for closing the end, and a spring 23 as a biasing force applying member is provided in the inner cavity of the sleeve 3 and is fitted over the spring 23, one end of the spring 23 being in abutment with the closing tip 25 and the other end being in abutment with a stepped wall in the sleeve 3 to apply a force to the guide rod 22 away from the engagement head 32.
The angle of deflection of the engagement jaw 21 relative to the axis of the guide bar 22 relative to the second end of the guide bar 22 may be defined by the acute angle α of the engagement jaw 21 relative to a plane parallel to or containing the axis of the guide bar 22 and perpendicular to the plane formed when the engagement jaw 21 rotates, or containing the pivot axis of the engagement jaw 21 and parallel to or containing the axis of the guide bar 22. As the deflection angle α of the engagement claw 21 with respect to the axis of the guide rod 22 becomes larger, the distance by which the engagement claw 21 protrudes axially outward becomes smaller.
As shown in fig. 7, the engagement claw 21 has a first engagement surface 211 and a second engagement surface 212, the second engagement surface 212 being located outside the first engagement surface 211 in the radial direction of the rotational driving force receiving member 2 and being located on the upstream side of the first engagement surface 211 in the rotational direction R of the rotational driving force receiving member 2. Fig. 9 is a perspective view of the engagement claw 21, in which the first engagement surface 211 and the second engagement surface 212 are more clearly shown. Fig. 10 is a side view of the engagement claw 21, and as shown in fig. 10, a first angle θ1 between the first engagement surface 211 and the rotation axis L of the rotational driving force receiving member 2 is smaller than a second angle θ2 between the second engagement surface 212 and the rotation axis L.
In the present invention, when the rotational force transmitting pin of the driving shaft is in the normal position (the state shown in fig. 4 a), both ends of the rotational force transmitting pin are engaged with the corresponding first engaging surfaces 211, respectively, the driving force can be stably and reliably transmitted between the engaging claw 21 and the driving force transmitting pin, and the cartridge is easily detached from the main body of the electrophotographic image forming apparatus. When the rotational force transmitting pin is offset in its axial direction so that only one end portion can be engaged with the engagement claw 21 (the state shown in fig. 4 b), the end portion will be engaged with the second engagement surface 212, and since the second angle θ2 between the second engagement surface 212 and the rotation shaft L is larger than the first angle θ1 between the first engagement surface 211 and the rotation shaft L, as described in fig. 3a, the torque T1 applied to the engagement claw 21 by the end portion will become smaller so as to be closer to or equal to the torque T2 applied by the spherical free end of the drive shaft to the spherical concave surface of the rotational force receiving member 10' (as shown in fig. 4 b), so that the rotational force receiving member and/or the drive shaft will not be deflected or will be deflected only to a low extent, the driving force can be transmitted normally, substantially, thereby solving the slipping phenomenon occurring in the prior art when the rotational force transmitting pin is offset in its axial direction so that only one end portion can be engaged with the engagement claw.
In the embodiment of the invention, the first included angle theta 1 is larger than 0 degree and smaller than 45 degrees, and the second included angle theta 2 is larger than 15 degrees and smaller than 60 degrees; preferably, the first included angle is greater than 10 ° and less than 40 °, and the second included angle is greater than 25 ° and less than 60 °; more preferably, the first included angle is greater than 15 ° and less than 30 °, and the second included angle is greater than 35 ° and less than 50 °. The ratio of the second included angle to the first included angle is more than 1.5 and less than 2.5; more preferably, the ratio of the second angle to the first angle is greater than 1.5 and less than 2.0. For example, the first included angle θ1 is about 25 °, and the second included angle θ2 is about 45 °.
In the case that the rotational driving force transmitting pin is located at the normal position, the first included angle θ1 is controlled within the above range, particularly, the preferable range, so that more stable driving force transmission can be realized, and the cartridge can be more conveniently detached. In the case where the rotational force transmitting pin is offset in the axial direction thereof such that only one end portion can be engaged with the engaging pawl, controlling the second included angle θ2 within the above-described range, particularly the preferred range, it may be more advantageous that the rotational driving force receiving member and/or the drive shaft is not deflected or is deflected only to a low degree.
In other embodiments of the invention, the engagement jaw may be fixedly disposed on the engagement head, e.g., the engagement jaw is integrally formed with the engagement head.
In the cartridge of the present invention, the driving assembly may be installed at a longitudinal end portion of the developing roller or the photosensitive drum to directly drive the developing roller or the photosensitive drum to rotate; the driving assembly may also be installed at a longitudinal end of the cartridge body and indirectly drive the developing roller and/or the photosensitive drum to rotate through a gear transmission mechanism.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various equivalent modifications may be made without departing from the scope of the invention, and it is intended to cover the invention as defined in the appended claims.
Claims (10)
1. A rotational driving force receiving member having a spherical concave surface formed on an axially outer side of an engagement head portion thereof and at least one engagement claw protruding from the engagement head portion in an axial direction thereof; wherein the engagement claw has a first engagement surface and a second engagement surface that is located outside the first engagement surface in a radial direction of the rotational driving force receiving member and located on an upstream side of the first engagement surface in a rotational direction of the rotational driving force receiving member; and wherein a first angle between the first engagement surface and the rotational axis of the rotational drive force receiving member is smaller than a second angle between the second engagement surface and the rotational axis of the rotational drive force receiving member.
2. The rotational driving force receiving member according to claim 1, wherein the first included angle is greater than 0 ° and less than 45 °, and the second included angle is greater than 15 ° and less than 60 °.
3. The rotational driving force receiving member according to claim 1, wherein a ratio of the second angle to the first angle is greater than 1.5 and less than 2.5.
4. The rotational driving force receiving member according to claim 1, wherein the number of the engaging claws is two, the two engaging claws being disposed at regular intervals in the circumferential direction of the engaging head.
5. The rotational driving force receiving member according to claim 1, wherein the engagement claw is provided so as to be deflectable with respect to the engagement head or fixedly connected with the engagement head.
6. A drive assembly, comprising:
a cylindrical member, the outer wall of which is provided with a gear;
a rotational driving force receiving member reciprocally movably provided in an axial direction of the cylindrical member;
wherein the rotational driving force receiving member includes:
a sleeve having a connecting end located inside the cylindrical member and an engagement head located outside the cylindrical member, the engagement head having a spherical concave surface formed on an axially outer side thereof and a limit groove extending radially inward thereof to the spherical concave surface;
a guide rod reciprocally disposed along an axial direction of the sleeve and having a first end positioned within the sleeve lumen and a second end extendable from the sleeve lumen;
a biasing force applying member provided in the sleeve for applying a force to the guide rod away from the engagement head;
an engagement claw pivotably connected to the second end of the guide rod and protruding from the engagement head portion in an axial direction of the sleeve from the limit groove;
wherein the engagement claw has a first engagement surface and a second engagement surface that is located outside the first engagement surface in a radial direction of the rotational driving force receiving member and located on an upstream side of the first engagement surface in a rotational direction of the rotational driving force receiving member; and wherein a first angle between the first engagement surface and the rotational axis of the rotational drive force receiving member is smaller than a second angle between the second engagement surface and the rotational axis of the rotational drive force receiving member.
7. The drive assembly of claim 6, wherein the first included angle is greater than 0 ° and less than 45 ° and the second included angle is greater than 15 ° and less than 60 °.
8. The drive assembly of claim 6, wherein a ratio of the second included angle to the first included angle is greater than 1.5 and less than 2.5.
9. The drive assembly of claim 6, wherein the number of engagement claws is two, the two engagement claws being uniformly spaced apart in a circumferential direction of the engagement head.
10. A cartridge detachably mountable to a main body of an electrophotographic image forming apparatus, comprising a developing roller and/or a photosensitive drum, and the driving assembly according to any one of claims 6 to 9; wherein the driving assembly receives a rotational driving force from the electrophotographic image forming apparatus main body and directly or indirectly drives the developing roller and/or the photosensitive drum to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711345885.9A CN107831645B (en) | 2017-12-15 | 2017-12-15 | Rotational driving force receiving member, driving assembly, and cartridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711345885.9A CN107831645B (en) | 2017-12-15 | 2017-12-15 | Rotational driving force receiving member, driving assembly, and cartridge |
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| Publication Number | Publication Date |
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| CN107831645A CN107831645A (en) | 2018-03-23 |
| CN107831645B true CN107831645B (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711345885.9A Active CN107831645B (en) | 2017-12-15 | 2017-12-15 | Rotational driving force receiving member, driving assembly, and cartridge |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024046242A1 (en) * | 2022-08-27 | 2024-03-07 | 江西亿铂电子科技有限公司 | Processing box |
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| CN107831645A (en) | 2018-03-23 |
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