WO2017215394A1

WO2017215394A1 - Rotational force transmitting assembly, photosensitive drum and process cartridge

Info

Publication number: WO2017215394A1
Application number: PCT/CN2017/084633
Authority: WO
Inventors: 李争光; 杨晓锋
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2016-06-16
Filing date: 2017-05-17
Publication date: 2017-12-21
Also published as: CN105843024A; CN105843024B

Abstract

Provided are a rotary force transmitting assembly (3), a photosensitive drum (11) and a process cartridge (1) constructed therewith, belonging to the field of electrophotographic imaging and printing technology. The rotational force transmitting assembly (3) comprises a drum gear (33), a rotational force transmitting head (5), a torsion spring (42), and a first rotational force receiving tooth (71) and a second rotational force receiving tooth (72) which are hinged to the rotational force transmitting head (5) by means of a hinge shaft. The rotation force transmitting head (5) is provided with limiting portions (524, 525) for restricting the rotational force receiving teeth (71, 72) from turning away from a coupling position to a disengagement position. A torsion arm (421) of the torsion spring (42) abuts against the first rotational force receiving tooth (71), the other torsion arm (422) abuts against the second rotational force receiving tooth (72), and the restoring force therefrom forces the first rotational force receiving tooth (71) and the second rotational force receiving tooth (72) to abut against the limiting portions (524, 525).

Description

Rotary force transmitting component, photosensitive drum and process cartridge

The present invention relates to a process cartridge detachably mountable in an electrophotographic image forming apparatus, and a rotary force transmitting member thereof and a photosensitive drum. The present invention is based on a patent application filed on Jun. 16, 2016, the disclosure of which is incorporated herein by reference.

An electrophotographic image forming apparatus is an apparatus for forming an image on a printing medium such as paper by an electrophotographic principle, such as a copying machine, a printer, a facsimile machine, an all-in-one machine, etc., and the apparatus generally includes a main body and is detachably mounted in the main body. Processing box. Wherein the process cartridge has a casing and a photosensitive drum rotatably supported between the end walls of the casing, the photosensitive drum comprising a drum and a rotational force transmitting assembly mounted at an axial end of the drum.

The patent document with the publication number CN201945803U discloses a rotary driving force receiving head and a driving assembly, that is, a rotational force receiving head and a rotational force transmitting assembly. As shown in FIG. 1, the rotational force transmitting member 01 is composed of an axial stopper 031, a drum gear 032, an axial return spring 033, and a rotational force receiving head 08. The rotational force receiving head 08 is composed of a rotational force transmitting head 04, a first pin shaft 061, a second pin shaft 062, a first rotational force receiving tooth 071, a second rotational force receiving tooth 072, and two tension springs 05.

The upper end portion of the first rotational force receiving tooth 071 is formed with a coupling surface 0711 for engaging with the rotational force output arm of the main drive shaft, and a shaft hole 0712 is formed in the middle portion to cooperate with the first pin shaft 061, and the lower end portion is formed with The hook of the tension spring 05 is fitted with a suspension hole 0713. The rotational force transmitting head 04 is composed of a guide rod 041 and a bracket 042. The bracket 042 is formed with a first mounting groove 0422 that cooperates with the middle portion of the first rotational force receiving tooth 071 and a suspension that cooperates with another hook of the tension spring 05. A hole, 0421, which is engaged with the first pin 061, is formed on both sides of the hole and the mounting groove 0422. By the cooperation of the first pin shaft 061 and the shaft hole 0421 and the shaft hole 0712, the first rotational force receiving tooth 071 is rotatably hinged around the first pin shaft 061 to the rotational force transmitting head 04, and the first pin shaft 061 is the first The hinge shaft switches the first rotational force receiving tooth 071 about a first coupling position thereof that transmits a rotational force to the main drive shaft coupling and a first disengaged position that is disengaged from the main body drive shaft. One hook of the tension spring 05 is hung to the suspension hole 0713, and the other hook is hung to the suspension hole provided on the bracket 042. Similar to the first rotational force receiving tooth 071, the second rotational force receiving tooth 072 is hinged to the rotational force transmitting head 04 by the second pin shaft 062, and the second pin shaft 062 serves as the second hinge shaft so that the second rotational force receiving tooth 072 can be It switches between the second coupling position and the second disengagement position. The axial direction of the first pin 061 is parallel to the axial direction of the second pin 062.

As shown in Figure 2, when the toner in the process cartridge is exhausted, the process cartridge needs to be removed from the mainframe, assuming that the process cartridge is pulled out of the mainframe in the direction shown by the arrow in Fig. 2, due to the spherical end of the drive shaft 02. The abutting action of the portion 022, the second rotational force receiving tooth 072 is rotated clockwise from the second coupling position to the second disengaging position about the second pin shaft 062 against the elastic restoring force of the tension spring 05, so as to drive the shaft 02 and When the rotational force receiving head 08 is disengaged from the coupling, when the two are completely disengaged from the coupling, that is, when the second rotational force receiving tooth 072 is in the disengaged state, the tension spring 05 acts as a tooth resetting member, and its elastic restoring force forces the second rotational force receiving tooth 072 to be reset. To the second junction position.

The above-described rotational force transmitting member 01 can facilitate the disengagement coupling of the rotational force receiving head 08 from the drive shaft 02. However, the rotational force receiving head 08 has a complicated structure, is inconvenient to assemble, and is miniaturized.

In addition, when the insertion direction of the process cartridge to the main body is as shown by the arrow in FIG. 3, that is, the line connecting the first rotational force receiving tooth 071 and the second rotational force receiving tooth 072 is arranged parallel to the insertion direction, it is easy to appear as shown in the figure. 3, that is, the second rotational force receiving tooth 072 is easily abutted with its upper end portion rotating inward, that is, the second rotational force receiving tooth 072 is turned from the second coupling position away from the second disengaging position, resulting in the entire The connection process is not smooth.

The main object of the present invention is to provide a rotational force transmitting assembly having a miniaturized rotational force transmitting head;

Another object of the present invention is to provide a rotary force transmitting head having a miniaturization and a rotary force transmitting assembly capable of improving the smoothness of the process of positioning the process cartridge;

It is still another object of the present invention to provide a photosensitive drum constructed by the above-described rotational force transmitting assembly;

It is still another object of the present invention to provide a process cartridge having a rotary force transmitting head that facilitates miniaturization;

Still another object of the present invention is to provide a process cartridge having a rotary force transmitting head which is easy to miniaturize and which can improve the smoothness of the seating process.

In order to achieve the above main object, a rotary force transmitting assembly provided by the present invention includes a drum gear, a rotational force transmitting head, an axial return member, a tooth resetting member, and a first rotational force receiving tooth hinged to the rotational force transmitting head through the first hinge shaft The teeth are received with a second rotational force that is hinged to the rotational force transmitting head by the second hinge shaft. The first rotational force receiving tooth is switchable between the first coupling position and the first disengagement position about the first hinge axis, and the second rotational force receiving tooth is switchable between the second coupling position and the second disengagement position about the second hinge axis. The tooth resetting member is a torsion spring, and the coil of the torsion spring is disposed at a fixed position of the rotational force transmitting head. a first limiting portion and a second limiting portion are disposed on the rotational force transmitting head, and the first limiting portion is configured to limit a direction in which the first rotational force receiving tooth is turned away from the first coupling position away from the first disengagement position, and the second limit The seat portion is for restricting a direction in which the second rotational force receiving tooth is turned away from the second coupling position away from the second disengagement position. A twisting arm of the torsion spring receives the tooth against the first rotational force, and the other twisting arm receives the tooth against the second rotational force, and the elastic restoring force of the torsion spring forces the first rotational force receiving tooth to abut against the first limiting portion and forcibly The second rotational force receiving tooth abuts against the second limiting portion.

A specific solution is that the rotational force transmitting head includes a guiding rod and a rotational force receiving portion at an axial end of the guiding rod. The rotational force receiving portion is provided with a mounting groove that penetrates the rotational force receiving portion in the radial direction of the drum gear. The first rotational force receiving tooth is hinged into the mounting groove through the first hinge shaft, and the second rotational force receiving tooth is hinged into the mounting groove through the second hinge shaft. The fixed position is a fixed shaft disposed on the rotary force transmitting head, and the coil is sleeved on the fixed shaft, and the torsion spring is fixed into the mounting groove through the fixed shaft. Since the torsion spring is disposed in the mounting groove, the radial size of the rotational force transmitting head is greatly reduced compared to the prior art.

A more specific solution is that the two sides of the mounting groove are symmetrical about the first plane and are both parallel to the first plane, the central axis of the guiding rod is in the first plane, and the normal of the first plane and the first hinge The axial directions are parallel. The connection stability between the rotational force transmitting component and the main drive shaft during operation is effectively improved.

Another more specific solution is to include a reinforcement unit. The reinforcing unit comprises: a connecting portion located at an end of the mounting groove away from the guiding rod and fixedly connected with the two side walls of the mounting groove, and/or a C-shaped piece wrapped around a section of the rotating force receiving portion adjacent to the guiding rod, C type Both side ends of the sheet are bent inwardly and fastened in a groove on the side of the rotational force receiving portion. The strength of the rotational force receiving portion is effectively increased to facilitate further miniaturization.

In order to achieve the above other object, another embodiment of the present invention provides a rotary force transmitting head including a guide rod and a rotational force receiving portion provided at an axial end of the guide rod. A section of the guide rod adjacent to the rotational force receiving portion is a force receiving section for receiving a force forcing the rotational force transmitting head to rotate relative to the central axis of the drum gear about the guide rod within a predetermined angular range. Due to the setting of the force receiving section, the rotational force transmitting head can be rotated within a predetermined angle to the line connecting the two rotational force receiving teeth away from the insertion direction, thereby effectively improving the process cartridge having the rotational force transmitting component in the process of being seated. Smoothness.

More specifically, the first magnet is fixed on the force receiving section, and the magnetic pole connecting lines of the first magnet are arranged along the radial direction of the guiding rod; or the second magnet and the third magnet are fixed on the force receiving section, and the second magnet and The magnetic pole wires of the third magnet are all arranged along the radial direction of the guiding rod, the magnetic poles of the second magnet and the third magnet are collinear, and the magnetic poles of the second magnet and the third magnet are away from the radial center of the guiding rod. . The force section has a simple structure, is easy to process, and has low cost.

In order to achieve the above further object, the photosensitive drum provided by the present invention includes a drum and a rotational force transmitting assembly mounted at one axial end of the drum. Wherein, the rotational force transmitting component is the rotational force transmitting component described in any of the above technical solutions.

In order to achieve the above object, the process cartridge of the present invention comprises a casing and a photosensitive drum rotatably supported between the end walls of the casing about a rotation axis. The photosensitive drum includes a drum and a rotational force transmitting assembly mounted to one axial end of the drum. The rotational force transmitting component is the rotational force transmitting component described in any of the above technical solutions.

In order to achieve the above further object, a specific solution provided by the present invention is that the process cartridge further includes an offset mechanism. The rotational force transmitting head is provided with a force receiving section for receiving a force forcing the rotational force transmitting head to rotate relative to the drum gear about a rotational axis within a predetermined angular range. When the two rotational force receiving teeth are in the disengaged coupling state, the biasing mechanism applies a force to the force receiving section to force the rotational force transmitting head to rotate to the two rotational force receiving teeth to deviate from a sector plane perpendicular to the rotation axis. The apex of the scallop is on the axis of rotation, and the bisector of the scallop is arranged parallel to the insertion direction of the process cartridge to the main body. Effectively improve the smoothness of the processing box in place.

In order to achieve the above further object, another specific solution provided by the present invention is that the process cartridge further includes an offset mechanism. The rotational force transmitting head is provided with a force receiving section for receiving a force forcing the rotational force transmitting head to rotate relative to the drum gear about a rotational axis within a predetermined angular range. When the two rotational force receiving teeth are in the disengaged coupling state, the biasing mechanism applies a force to the force receiving section to force the rotational force transmitting head to rotate between the connecting lines of the two rotational force receiving teeth and the insertion direction of the process cartridge to the main body. The angle of the angle is 45 degrees to 135 degrees. Effectively improve the smoothness of the processing box in place.

The present invention can effectively simplify the structure of the rotational force transmitting head to facilitate miniaturization of the rotational force transmitting head. By providing the limiting portion, during the positioning of the process cartridge having the rotational force transmitting assembly, it is possible to effectively ensure that the rotational force receiving tooth does not turn away from the disengaged position by the coupled position when abutting against the main drive shaft It is impossible to achieve a connection between the two.

1 is a structural exploded view of a conventional rotary force transmitting assembly;

2 is a schematic view showing a disengagement coupling process between the rotational force transmitting assembly of FIG. 1 and the main drive shaft;

Figure 3 is a schematic view showing a coupling process between the rotational force transmitting assembly of Figure 1 and the main drive shaft;

Figure 4 is a perspective view of a first embodiment of the process cartridge of the present invention;

Figure 5 is a perspective view of the rotary force transmitting assembly and the offset mechanism in the first embodiment of the process cartridge of the present invention;

Figure 6 is a structural exploded view of the rotary force transmitting assembly and the offset mechanism in the first embodiment of the process cartridge of the present invention;

Figure 7 is a perspective view of the rotary force receiving head and the axial limiting member in the first embodiment of the process cartridge of the present invention;

Figure 8 is a perspective view of the fixing assembly of the offset mechanism in the first embodiment of the process cartridge of the present invention;

Figure 9 is a structural exploded view of the rotary force transmitting head, the pin shaft, the fixed shaft, the rotational force receiving tooth and the C-shaped piece in the first embodiment of the process cartridge of the present invention;

Figure 10 is a structural exploded view of the rotary force transmitting head, the pin shaft, the rotational force receiving tooth and the torsion spring in the first embodiment of the process cartridge of the present invention;

Figure 11 is an exploded perspective view showing another perspective view of the rotary force transmitting head, the pin shaft, the rotational force receiving tooth and the torsion spring in the first embodiment of the process cartridge of the present invention;

Figure 12 is a front elevational view showing the first embodiment of the process cartridge of the present invention in a state in which the rotary force receiving head is coupled to the main drive shaft;

Figure 13 is a front elevational view showing the rotational force receiving teeth of the first embodiment of the process cartridge of the present invention;

Figure 14 is a schematic view showing a coupling process between the rotary force receiving head and the main drive shaft in the first embodiment of the process cartridge of the present invention;

Figure 15 is a structural exploded view of the casing, the offset mechanism and the rotational force transmitting assembly in the first embodiment of the process cartridge of the present invention;

Figure 16 is a schematic view showing the first state of cooperation between the offset mechanism and the rotational force transmitting component when the two rotational force receiving teeth of the first embodiment of the process cartridge of the present invention are in the disengaged state;

17 is a schematic view showing a second state of cooperation between the offset mechanism and the rotational force transmitting component when the two rotational force receiving teeth in the first embodiment of the process cartridge of the present invention are in the disengaged state;

18 is a schematic view showing a third state of cooperation between the offset mechanism and the rotational force transmitting component when the two rotational force receiving teeth in the first embodiment of the process cartridge of the present invention are in the disengaged state;

19 is a schematic view showing a fourth state of cooperation between the offset mechanism and the rotational force transmitting component when the two rotational force receiving teeth in the first embodiment of the process cartridge of the present invention are in the disengaged state;

20 is a schematic view showing a fifth state of cooperation between the offset mechanism and the rotational force transmitting component when the two rotational force receiving teeth in the first embodiment of the process cartridge of the present invention are in the disengaged state;

21 is a schematic view showing a sixth state of cooperation between the offset mechanism and the rotational force transmitting component when the two rotational force receiving teeth in the first embodiment of the process cartridge of the present invention are in the disengaged state;

Figure 22 is a view showing a seventh state of cooperation between the offset mechanism and the rotational force transmitting component when the two rotational force receiving teeth in the first embodiment of the process cartridge of the present invention are in the disengaged state;

23 is a schematic view showing an eighth state of cooperation between the offset mechanism and the rotational force transmitting component when the two rotational force receiving teeth in the first embodiment of the process cartridge of the present invention are in the disengaged state;

Figure 24 is a schematic view showing a sector surface of the first embodiment of the process cartridge of the present invention;

Figure 25 is a schematic view showing the structure of a second offset mechanism in the first embodiment of the process cartridge of the present invention;

Figure 26 is a schematic view showing the structure of a fourth offset mechanism in the first embodiment of the process cartridge of the present invention;

Figure 27 is a schematic view showing the structure of a fifth type of deviation mechanism in the first embodiment of the process cartridge of the present invention;

Figure 28 is a perspective view of the offset mechanism in the second embodiment of the process cartridge of the present invention;

Figure 29 is a perspective view of the offset mechanism and the rotational force transmitting head in the second embodiment of the process cartridge of the present invention;

Figure 30 is a schematic view showing the cooperation of the deviation mechanism and the rotational force transmitting head in the second embodiment of the process cartridge of the present invention;

Figure 31 is a schematic view showing the state of cooperation of the offset mechanism and the rotational force transmitting component in the printing process in the second embodiment of the process cartridge of the present invention;

32 is a schematic view showing a state of cooperation between the offset mechanism and the rotational force transmitting component when the two rotational force receiving teeth of the second embodiment of the process cartridge of the present invention are in the disengaged state;

Figure 33 is a schematic view showing a scalloped surface in a second embodiment of the process cartridge of the present invention;

Figure 34 is a view showing the cooperation of the force receiving section and the deviation mechanism of another structure in the second embodiment of the process cartridge of the present invention.

The invention will be further described below in conjunction with the embodiments and the accompanying drawings.

The following embodiments are mainly described for the process cartridge of the present invention. Since the process cartridge of the present invention employs the rotary force transmitting assembly and the photosensitive drum of the present invention, the embodiment of the processing cartridge embodiment includes the embodiment of the rotary force transmitting assembly and the photosensitive drum. Description of the embodiments.

Processing box first embodiment

Referring to Fig. 4, the process cartridge 1 has a cartridge body 10 and a photosensitive drum 11 rotatably supported between the end walls of the casing 10 about its own rotation axis 001, and an offset mechanism fixed to the driving end cover 100 of the casing 10. 2. The photosensitive drum 11 has a drum and a rotational force transmitting assembly 3 as shown in FIG. 5. The rotational force transmitting assembly 3 is mounted at one axial end of the drum for coupling with the main drive shaft 005 to receive the rotational force and to receive The rotational force is transmitted to the drum and other rotating parts.

Referring to FIGS. 5 to 10, the rotational force transmitting assembly 3 is composed of a rotational force receiving head 4, an axial stopper 31, a spring 32, and a drum gear 33. The spring 32 constitutes the axial return member of the present embodiment.

The rotational force receiving head 4 is composed of a rotational force transmitting head 5, a transmission shaft 41, a torsion spring, a fixed shaft 43, a C-plate 44, a first pin 61, a second pin 62, a first rotational force receiving tooth 71, and a second The rotational force receiving teeth 72 are formed.

The rotational force transmitting head 5 is composed of a cylindrical guide rod 51 and a rotational force receiving portion 52 located at one axial end of the guide rod 51, and a through hole 511 that cooperates with the transmission shaft 41 is formed in the middle portion of the guide rod 51 in the radial direction. The rotation force receiving portion 52 is provided with a mounting groove 521 that penetrates the rotational force receiving portion 52 in the radial direction of the guide rod 51, that is, the mounting groove 521 is arranged along the radial direction of the drum gear 33, and the mounting groove 521 is disposed away from the end portion of the guide rod 51. The connecting portion 522 is connected to the two side walls of the mounting groove 521 for improving the structural strength of the rotating force receiving portion 52. The connecting portion 522 and the side walls of the mounting groove 521 are integrally formed, and the rotating force receiving portion 52 is away from the guide. The end surface 520 of the rod 51 is a flat surface. A section of the guide rod 51 adjacent to the rotational force receiving portion 52 is a force receiving section 512 for receiving a force forcing the rotational force transmitting head 5 to rotate relative to the drum gear 33 about the rotational axis 001 within a predetermined angular range.

As shown in FIG. 6, FIG. 9, and FIG. 10, a groove 523 disposed along the axial direction of the guide bar 51 is recessed in the side surface of the rotational force receiving portion 52, and the C-shaped piece 44 is wrapped around the rotational force receiving portion 52. A section of the rod 51, and the two side ends 441 thereof are bent inwardly to be engaged in the recess 523, thereby reinforcing the effective cross section of the section due to the insufficient strength caused by the opening of the mounting groove 521. The connecting portion 522 and the C-shaped sheet 44 constitute the reinforcing unit of the present embodiment, and only one of the connecting portion 522 and the C-shaped sheet 44 may be used as the reinforcing unit under the condition that the structural strength allows.

As shown in FIGS. 6 and 8, the offset mechanism 2 is composed of a rotary member and a fixed assembly, and the rotary member is constituted by a first magnet 24, and the fixed assembly is composed of a mount 21, a second magnet 22, and a third magnet 23. A fixing groove 510 for fixing the first magnet 24 is formed on the force receiving section 512. The mounting seat 21 has an annular mounting portion 211 and a sheet-shaped fixing portion 212. The mounting portion 211 is provided with a fixing groove 213 for fixing the second magnet 22 and a fixing groove 215 for fixing the third magnet 23. The fixing portion 212 Two fixing holes 214 are provided on the upper surface. The magnetic pole connection of the second magnet 22 is collinear with the magnetic pole connection of the third magnet 23. Wherein, the magnetic pole connection of the magnet refers to the connection between the N pole and the S pole of the magnet, such as a cylindrical magnet having one end of the N pole and the other end of the S pole, and the magnetic pole connection is the two end faces thereof. The connection of the center of the circle.

As shown in FIG. 5 and FIG. 6, the outer shape of the drum gear 33 is substantially cylindrical. The radial outer wall of the drum gear 33 is provided with a helical gear 330 for transmitting the rotational force received by the drum gear 33 to other rotating members. The drum gear 33 is provided with a receiving cavity 331 which is open at one axial end thereof, and the other axial end is formed with a guiding hole 332 which communicates with the receiving cavity 331; the inner wall of the receiving cavity 331 parallel to the axial direction of the drum gear 33 is provided A rib 333 extending in the radial center of the drum gear 33.

As shown in FIG. 6 and FIG. 7, the axial limiting member 31 has a substantially cylindrical outer shape, and is provided with a receiving cavity 311 which is open at one axial end thereof, and the other axial end is formed to communicate with the receiving cavity 311. The guiding hole 310 is disposed on the radially outer wall thereof with a locking groove 312 which cooperates with the protruding strip 333, and the locking groove is formed between the locking groove 312 and the protruding strip 333, so that the axial limiting member 31 and the drum are arranged The gears 33 are positioned in the circumferential direction to transmit a rotational force. The inner wall of the accommodating chamber 311 parallel to the axial direction of the axial stopper 31 is provided with an input arm 313 extending toward the radial center of the axial stopper 31.

As shown in FIG. 6 and FIG. 7, the other axial end of the guide rod 51 passes through the guide hole 310, the accommodating cavity 311, the spring 32, and the accommodating cavity 331 which are in clearance with the gap, and the guide hole 332 is matched with the gap. Thereby, the rotational force transmitting head 5 is reciprocally movable relative to the drum gear 33 in the axial direction of the guide rod 51; in the circumferential direction of the axial stopper 31, the transmission shaft 41 is in contact with the input arm 313 at the position of the input arm 313. , thereby transmitting the rotational force received by the rotational force transmitting head 5 to the axial limiting member 31; when the force receiving portion 512 is subjected to the circumferential torque, the rotational force transmitting head 5 is rotatable relative to the drum gear 33 about the rotational axis 001 The rotation within the angular range is controlled by the structure, size and number of the input arm 313 and the transmission shaft 41.

As shown in FIG. 6, one end of the spring 32 abuts against the transmission shaft 41, and the other end abuts against the bottom surface of the accommodating chamber 331. The axial limiting member 31 covers the open end of the receiving cavity 331, and the elastic restoring force of the spring 32 in the axial direction forces the transmitting shaft 41 against the axial limiting member 31.

Referring to FIGS. 9 to 11, the first rotational force receiving teeth 71 are identical in structure to the second rotational force receiving teeth 72, and their structures will be described below by taking the second rotational force receiving teeth 72 as an example. The tooth top 722 of the second rotational force receiving tooth 72 is formed with a coupling surface 720, and the root portion 721 is formed with a shaft hole 723 that matches the second pin shaft 62, and the root portion 721 faces the radial center side of the rotational force receiving portion 52. The recess is formed with an abutment surface 7210 that cooperates with the second torsion arm 422 of the torsion spring 42.

The two side walls of the mounting groove 521 are provided with mounting holes matching the first pin 61, the second pin 62 and the fixed shaft 43, and the axes of the first pin 61, the second pin 62 and the fixed shaft 43 are mutually In parallel, both ends of at least one of the first pin 61, the second pin 62, and the fixed shaft 43 can be fixedly coupled to both side walls of the mounting groove 521 to increase the structural strength of the rotational force receiving portion 52. The first pin 61 and the second pin 62 are both located on the side of the fixed shaft 43 opposite to the guide bar 51, and the line connecting the three axes constitutes an isosceles triangle whose apex of the fixed axis 43 is the apex angle. By the cooperation of the first pin shaft 61 and the shaft hole 713, the first rotational force receiving tooth 71 is hinged into the mounting groove 521, that is, hinged to the rotational force transmitting head 5 through the hinge shaft, and can be wound around the first pin shaft 61 Switching between a coupling position and the first disengagement position; the second rotation force receiving tooth 72 is hinged into the mounting groove 521 by the cooperation of the second pin shaft 62 and the shaft hole 723, that is, hinged to the rotational force transmitting head 5 by the hinge shaft And switching between the second coupling position and the second disengaging position about the second pin 62; the axes of the first pin 61 and the second pin 62 are parallel to each other and both are perpendicular to the axis of rotation 001 as shown in FIG. The torsion spring 43 is fixed in the mounting groove 521 by the spring coil 420 of the torsion spring 42 being sleeved on the fixed shaft 43 , and the first twisting arm 421 of the torsion spring 42 abuts against the abutting surface. 7110, the second twist arm 422 abuts against the abutment surface 7210. The fixed shaft 43 constitutes a fixed position for arranging the coil 420 in this embodiment.

On both sides of the mounting groove 521, the rotation force receiving portion 52 is formed with a first limiting portion 524 and a second limiting portion 525 from the end surface 520 thereof in a direction away from the guiding rod 51. The elastic restoring force of the torsion spring 42 is forced. The lower end surface 7120 of the root portion 712 abuts against the first limiting portion 524 such that the first rotational force receiving tooth 71 is held at the first coupling position, that is, the first limiting portion 524 limits the first rotational force receiving tooth 71 from The first coupling position is turned away from the first disengagement position; the elastic restoring force of the torsion spring 42 also forces the lower end surface 7220 of the root portion 722 against the second limiting portion 525 so that the second rotational force receiving tooth 72 is retained At the second coupling position, the second limiting portion 525 limits the direction in which the second rotational force receiving tooth 72 is turned away from the second coupling position away from the second disengagement position. In addition, the elastic restoring force of the torsion spring 42 also forces the rotational force receiving teeth to be reset from the disengaged position to the coupled position.

Referring to FIGS. 10 to 13, the first plane 002 is a plane whose normal direction is parallel to the axial direction of the first pin shaft 61, and the second plane 003 is a plane whose normal direction is perpendicular to the axial direction of the first pin shaft 612. And the rotation axis 001 shown in FIG. 4 is the intersection of the first plane 002 and the second plane 003, that is, the central axis of the guide rod 51 is in the first plane 002.

As shown in FIG. 11, the two sides of the mounting groove 521 are parallel to the first plane 002, so that when the main drive shaft 005 drives the rotational force transmitting head 5 to rotate about the rotational axis 001, the rotational force receiving teeth and the side wall of the mounting groove 512 Abutting the generated force along the tangential direction of the rotation of the rotational force transmitting head 5, that is, does not generate a component force parallel to the first plane 002, effectively preventing the rotational force receiving teeth from rotating from the coupling position to the disengaged position during the rotation. Phenomenon to improve the coupling stability between the rotational force transmitting component and the main drive shaft.

As shown in FIG. 12, when the main body drive shaft 005 rotational force output arm 0051 is coupled with the rotational force receiving tooth, the axial direction of the rotational force output arm 0051 is parallel to the first plane 002, and at the same time, the coupling faces 710 and 720 are at the second. The projection on the plane 003 is symmetrical about the first plane 002, thereby effectively ensuring that the force applied by the rotational force output arm 0051 to the rotational force receiving tooth is also tangentially rotated along the rotational force transmitting head 5 to improve the rotational force transmitting head 5 and the host The coupling stability between the drive shafts 003.

The rotational direction of the rotational force transmitting head 5 in the operating state, in the present embodiment, is a counterclockwise direction as shown in FIG. 11, as shown in FIGS. 9 to 11, the tooth tip 712 of the first rotational force receiving tooth 71. The tooth root portion 711 is offset from the rotational direction of the rotational force transmitting head 5, and the tooth tip portion 722 of the second rotational force receiving tooth 72 is offset from the root portion 721 toward the rotational direction of the rotational force transmitting head 5 to ensure the rotational strength receiving tooth structural strength. At the same time, the rotational force is reduced to receive the lateral dimension of the root of the tooth to facilitate miniaturization of the entire rotational force receiving head.

Further, when the process cartridge is loaded into the main body in the insertion direction 006 as shown by the arrow in FIG. 14, if it is in position, the connection 007 and the insertion direction between the first rotational force receiving tooth 71 and the second rotational force receiving tooth 72 are in place. 006 has an angle, that is, the connection 007 is not parallel to the insertion direction 006, and the process box is more smooth than the prior art; if the position is large, the angle is so large that the entire rotation force receives the tooth deviation. The third plane 004 can further improve the smoothness of the in-place process. The third plane 004 is a plane that is perpendicular to the axis of rotation 001 and parallel to the direction of insertion 006. The connection line 007 is defined as a line connecting the center of the rotation force receiving tooth on the end surface 520 above the end surface 520. In the present embodiment, since the two rotation force receiving teeth are symmetrically arranged about the rotation axis 001, the connection 007 is also It is orthogonal to the axis of rotation 001.

Referring to FIG. 15, the fixing assembly of the offset mechanism is fixed to the end cover 100 by the cooperation of the fixing post 101 provided on the end cover 100 with the fixing hole 214, and the position of the positioning seat 21 is positioned; the rotational force receiving head 4 The free end passes through the through hole 102 provided in the end cover 100, so that the two rotating force receiving teeth are exposed to the outside of the casing to be coupled with the main drive shaft, and the first magnet, the second magnet and the third magnet are The pole wires are all arranged in the radial direction of the guide bar 51 and are coplanar.

Referring to FIG. 16, the magnetic poles of the second magnet 22 and the third magnet 23 toward the one end in the radial center of the rotational force transmitting head 5 have the same name magnetic pole, and the connection between the first rotational force receiving tooth 71 and the second rotational force receiving tooth 72. Aligning with the magnetic pole line of the first magnet 24, one end of the first magnet 24 away from the radial center of the rotational force transmitting head 5 is a different name from the end of the second magnet 22 toward the radial center of the rotational force receiving head 5. . When the two rotational force receiving teeth pass the abutment of the transmission shaft 41 and the input arm 313 to drive the axial limiting member 31 to rotate to the position shown in FIG. 16, at this time, if the two rotational force receiving teeth are in the disengaged coupling In the state, the attraction force between the three magnets, the repulsive force, and the limit between the transmission shaft 41 and the input arm 313, the two rotational force receiving teeth will remain in the position shown in FIG.

When the two rotational force receiving teeth are driven by the main drive shaft and drive the rotational force transmitting head 5, the axial limiting member 31 rotates counterclockwise relative to the position shown in FIG. 16 by 45 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees. 270 degrees and 315 degrees, after the two rotational force receiving teeth are in the disengaged state, the torque generated by the deviation mechanism 2 to the rotational force transmitting head 5 and the abutment between the transmission shaft 41 and the input arm 313 will force the two The rotational force receiving teeth are located at positions shown in FIGS. 17, 18, 19, 20, 21, 22, and 23 with respect to the axial stopper 31.

As shown in FIGS. 16 to 24, the magnetic pole connection of the second magnet 22, that is, the magnetic pole connection of the third magnet 23 is taken as an X-axis, and the X-axis and the Y-axis divide the rotation plane of the connection 007 into four quadrants, and It can be deduced from the above analysis that when the connection line 007 of the two rotational force receiving teeth is turned into the first sector area 081 as shown in FIG. 24, that is, in the second sector area 082, the receiving teeth are both disengaged in the two rotational force receiving teeth. In the state, the offset mechanism 2 will force the wire 007 to deviate to the first sector region 081, i.e., the second sector region 082, wherein the first sector region 081 is the second quadrant as shown, and the second sector region 082 is The fourth quadrant shown in the figure.

Therefore, the relative positional relationship between the first sector area 081 and the insertion direction 006 can be adjusted so that the connection line 007 is located at an angle with the insertion direction 006 before being seated, thereby improving the process of positioning the process cartridge. Smoothness; when the angle is so large that the two rotating force receiving teeth are off the third plane 004 when in the disengaged state, the smoothness of the process of positioning the process cartridge can be further improved; when the above angle is further increased When the two rotational force receiving teeth are in the disengaged state, the wire 007 is offset from a sector 008 with the first sector region 081 as the upper limit and the angle bisector along the insertion direction 006. The sector 008 is as shown in the figure. The shaded area shown at 24, whose apex is on the axis of rotation 001, can further improve the smoothness of the process of processing the casing; further, the two sides of the sector 008 are aligned with the sides of the first sector 081 The angle between the adjacent sides is greater than or equal to half of the central angle of the receiving force of the rotating force, which means that the receiving force of the rotating force can be deviated from the sector 008 before being seated, further improving the position of the processing box. Smoothness, when the central angle of the fan-shaped surface 008 is greater than or equal to the central angle of the rotational force receiving tooth, the positional smoothness can be significantly improved; when the third plane 004 is arranged along the angle bisector of the first sector-shaped region 081, in two When the rotational force receiving tooth is in the disengaged state, the angle between the wire 007 and the insertion direction 006 is 45 degrees to 135 degrees, that is, the wire will be deflected into the third quadrant, that is, the first quadrant.

Wherein, the central angle of the rotational force receiving tooth is defined as: the intersection of the axis of rotation 001 and the plane of the end surface 520 is centered, and the center and the rotational force receiving tooth are located at two ends of the contour line projected on the end surface 520 above the end surface 520 The angle between the two.

In addition, at least the following six variations can be made to the structure of the above-mentioned offset mechanism:

(1) Referring to Fig. 25, which is the offset mechanism of the second structure of the embodiment, the first magnet 24 is fixed to the rotational force transmitting head 5, the second magnet 22 and the third magnet 23 are fixed to the casing, and the second One end of the magnet 22 and the third magnet 23 adjacent to the radial center of the rotational force transmitting head 5 is a magnetic pole of the same name, and the magnetic pole lines of the three magnets are all arranged in the radial direction of the rotational force transmitting head 5 and are coplanar, and the second magnet 22 is The magnetic pole wires of the third magnet 23 are arranged in a line. One end of the first magnet 24 away from the radial center of the rotational force transmitting head 5 and one end of the second magnet 22 adjacent to the radial center of the rotational force transmitting head 5 are the same name magnetic pole, and the two rotational force receiving the connection between the teeth and the first The magnetic poles of the magnet 24 are collinear, the second quadrant as shown in the figure is the first sector 081, and the fourth quadrant is the second sector 082.

(2) With respect to the second structure described above, the difference between the end of the first magnet 24 away from the radial center of the rotational force transmitting head 5 and the end of the second magnet 22 adjacent to the radial center of the rotational force transmitting head 5 is a different name magnetic pole The first quadrant is the first sector area 081 and the second quadrant is the second sector area 082.

(3) Referring to Fig. 26, the offset mechanism of the fourth structure of the present embodiment is different from the second structure. The difference between the two rotational force receiving teeth and the magnetic pole connection of the second magnet 22 is the X-axis. The angle between the angles is 75 degrees, and the shaded area is the first sector area 081 and the second sector area 082 as shown in the figure, wherein the first sector area 081 is a second quadrant to rotate counterclockwise around the rotation axis 001 as shown in FIG. The rotation is 15 degrees, and the second sector region 082 is configured such that the third quadrant is rotated 15 degrees counterclockwise about the rotation axis 001 shown in FIG.

(4) Referring to Fig. 27, the offset mechanism of the fifth structure of the present embodiment is different from the second structure 22 in that the first magnet 24 is oriented toward the radial center of the rotational force transmitting head 5 and the second magnet 22 One end facing away from the radial center of the rotational force transmitting head 5 is a different name magnetic pole. Then, the second quadrant as shown in the figure is the sector-shaped region 081, and the fourth quadrant is the second sector-shaped region 082.

The insertion direction 006 is the insertion direction of the process cartridge to the host during the positioning process. When the process cartridge end cover is provided with a guide post that cooperates with the guide member on the main body, the guide post can be determined.

The following example illustrates how the relative positions of the first magnet 24, the second magnet 22, and the third magnet are determined during the process cartridge design:

(1) The arrangement of the three magnets is as shown in FIG. First, the insertion direction 006 is determined on the driving end cover 100 of the process cartridge 1, and the reference coordinate system composed of the X-axis and the Y-axis is determined by the angle bisector of the insertion direction being the second quadrant, and the insertion direction is The fourth quadrant points to the second quadrant; secondly, the magnetic poles of the second magnet 22 and the third magnet 23 are parallel to the X-axis to determine their fixed positions on the end cap 100, that is, the fixed post as shown in FIG. Position of 101; then, determine the connection 007 between the two rotational force receiving teeth as the perpendicular of the connection 007, the magnetic pole connection of the first magnet 24 is parallel with the perpendicular to determine that the first magnet 24 is guiding A fixed position on the rod 51.

(2) The arrangement of the three magnets is as shown in Fig. 26, in which the smaller angle between the line connecting the two rotational force receiving teeth and the line connecting the magnetic poles of the second magnet 22 is α degree. First, the insertion direction 006 is determined on the driving end cover 100 of the process cartridge 1, and the initial coordinate system formed by the X1 axis and the Y1 axis is determined by the angle bisector of the insertion direction being the second quadrant, and the insertion direction is The fourth quadrant points to the second quadrant; secondly, the initial coordinate system is rotated in a clockwise direction (90-α) degrees to form a reference coordinate system, the coordinate axes of the reference coordinate system are X and Y, and the magnetic poles of the first magnet 24 are connected with The X-axis is parallel to determine its fixed position on the casing; then, the connection 007 between the two rotational force receiving teeth is determined, and the connection 007 is rotated counterclockwise by α degrees to obtain a parallel connection with the magnetic pole of the second magnet 22 The parallel lines determine the fixed position of the second magnet 22 and the third magnet 23 on the guide rod 51.

(3) For the design of the angle between the connection line 007 and the insertion direction 006, the two rotation force receiving teeth and the position of the magnet fixed on the guide rod can be determined according to the above (1) and fixed in the box body. After the initial position of the upper magnet, the rotation axis 001 is used as the rotation center line, so that the magnetic pole connection of the magnet fixed on the casing rotates counterclockwise or clockwise (45-α) degrees to obtain the final magnet fixed on the casing. position.

Processing box second embodiment

As a description of the second embodiment of the process cartridge of the present invention, only differences from the first embodiment of the process cartridge will be described below.

Referring to Fig. 28, the deviating mechanism in this embodiment is composed of two elastic rods 80 fixed on the end cover 100 of the casing, and the two elastic rods 80 are arranged in parallel; the force receiving section 812 is clamped to the two elastic rods. Between 80.

Referring to Figures 29 and 30, the force-receiving section 812 has a first non-circular surface in cross section, and the first non-circular surface is radially convex from the first circular surface 8120 and from the edge of the first circular surface 8120. The formed first protrusion surface 8121 and the second protrusion surface 8122 are formed. The first protrusion surface 8121 and the second protrusion surface 8122 are symmetrically arranged with respect to the center of the center of the first circular surface 8120. In the direction of the protrusion, the size of the first protrusion surface 8121 gradually decreases in a direction perpendicular to the radial direction. In the direction of the protrusion, the size of the second protrusion surface 8122 is gradually reduced in the direction perpendicular to the radial direction.

The two elastic rods 80 are in an outwardly curved elastic deformation state due to the pressing action of the force-receiving portion 812, which will apply a reaction force to the force-receiving portion 812 that is pressed inwardly, and the reaction force will be generated on the force-receiving portion 812. Torque.

Referring to FIG. 31, when the first rotational force receiving tooth 871 and the second rotational force receiving tooth 872 abut against the input arm 8313 by the transmission shaft 841, the axial limiting member 831 is rotated to the position shown in FIG. When the two rotational force receiving teeth are in the disengaged state, the elastic restoring force of the elastic rod 80 generates torque through the force receiving section 812, which will force the rotational force transmitting head to rotate relative to the axial limiting member 831 about the rotation axis as shown in FIG. Show position.

It can be deduced that the shaded area 0881 shown in FIG. 33 is the first sector area, and the shaded area 0882 is the second sector area. The central angles of the first sector region and the second sector region are both less than 90 degrees, and the specific size is related to the structure and size of the first non-circular surface.

Of course, the cross section of the force receiving section can be replaced by the rhombic surface 8120 as shown in FIG. 34, and the above effect can also be obtained. When the rhombic surface 8120 takes a square surface, the central angles of the first sector area and the second sector area are both It reaches 90 degrees.

In the present invention, when the two rotational force receiving teeth are in the disengaged coupling state, the deviation mechanism forces the rotation force transmitting head to rotate to the connection between the rotational force receiving teeth at least at an angle to the insertion direction of the process cartridge to the main body. In order to improve the smoothness of the process of seating the process cartridge, the structure of the deviation mechanism and the cross-sectional shape of the force receiving section are not limited to the above embodiments, and there are various obvious variations.

In the above embodiments, the fixing structure of the torsion spring coil is not limited to the fixed shaft, and various kinds are obvious, for example, a card slot for holding the coil in the mounting groove.

The invention adopts a single torsion spring as the tooth resetting member, and the two twisting arms respectively provide the restoring force for the two rotating force receiving teeth to switch from the disengaged position to the coupled position, and the two existing tension springs are used as the tooth resetting members. Compared with the technical solution, the structure of the rotational force transmitting head can be effectively simplified to facilitate miniaturization of the rotational force transmitting head. By providing the limiting portion, during the positioning of the process cartridge having the rotational force transmitting assembly, it is possible to effectively ensure that the rotational force receiving tooth does not turn away from the disengaged position by the coupled position when abutting against the main drive shaft It is impossible to achieve a connection between the two.

Claims

a rotational force transmitting assembly including a drum gear, a rotational force transmitting head, a tooth resetting member, and a first rotational force receiving tooth hinged to the rotational force transmitting head by a first hinge shaft and hinged to the rotational force by a second hinge shaft a second rotational force receiving tooth of the transfer head;

The first rotational force receiving tooth is switchable between the first coupling position and the first disengagement position about the first hinge axis, and the second rotational force receiving tooth is rotatable around the second hinge axis at the second coupling position Switching with the second disengaged position;

It is characterized by:

The tooth resetting member is a torsion spring, and the coil of the torsion spring is disposed at a fixed position of the rotational force transmitting head;

a first limiting portion and a second limiting portion are disposed on the rotating force transmitting head, the first limiting portion restricting the first rotational force receiving tooth from being away from the first coupling position away from the first Deviating from a position, the second limiting portion is configured to restrict a direction in which the second rotational force receiving tooth is turned away from the second coupling position away from the second disengaged position;

a twisting arm of the torsion spring receives the tooth against the first rotational force, and the other twisting arm receives the tooth against the second rotational force, and the elastic restoring force of the torsion spring forces the first rotational force to receive The teeth abut against the first limiting portion and force the second rotational force receiving teeth against the second limiting portion.
The rotational force transmitting assembly of claim 1 wherein:

The rotary force transmitting head includes a guide rod and a rotational force receiving portion at an axial end of the guide rod;

The rotation force receiving portion is provided with a mounting groove that penetrates the rotation force receiving portion in a radial direction of the drum gear;

The first rotational force receiving tooth is hinged into the mounting groove through the first hinge shaft, and the second rotational force receiving tooth is hinged into the mounting groove through the second hinge shaft;

The fixing position is a fixed shaft, the coil is sleeved on the fixed shaft, and the torsion spring is located in the mounting groove.
The rotary force transmitting assembly according to claim 2, wherein:

The two sides of the mounting groove are symmetrical about the first plane and are both parallel to the first plane;

The central axis of the guide rod is in the first plane, and the normal of the first plane is parallel to the axial direction of the first hinge shaft.
The rotary force transmitting assembly of claim 2, further comprising a reinforcing unit, the reinforcing unit comprising:

a connection portion located at an end of the mounting groove away from the guide rod and fixedly connected to both side walls of the mounting groove, and/or

a C-shaped sheet wrapped around the section of the rotating force receiving portion adjacent to the guide rod, the both ends of the C-shaped sheet being bent inwardly to be engaged with the groove on the side of the rotating force receiving portion Inside.
The rotational force transmitting assembly of claim 1 wherein:

The rotary force transmitting head includes a guide rod and a rotational force receiving portion provided at an axial end of the guide rod;

A section of the guide rod adjacent to the rotational force receiving portion is a force receiving section for receiving a force forcing the rotational force transmitting head to rotate relative to the drum gear about a central axis of the guide rod within a predetermined angular range.
A rotary force transmitting assembly according to claim 5, wherein:

a first magnet is fixed on the force receiving section, and a magnetic pole connection line of the first magnet is arranged along a radial direction of the guiding rod; or

a second magnet and a third magnet are fixed on the force receiving portion, and magnetic pole lines of the second magnet and the third magnet are respectively arranged along a radial direction of the guiding rod, and the second magnet is The magnetic poles of the third magnet are collinear, and the second magnet has the same name as the magnetic pole of the third magnet that faces away from the radial center of the guide.
a photosensitive drum comprising a drum and a rotational force transmitting assembly mounted at one axial end of the drum;

It is characterized by:

The rotational force transmitting assembly is the rotational force transmitting assembly of any one of claims 1 to 6.
a process cartridge comprising a casing and a photosensitive drum rotatably supported between the end walls of the casing about an axis of rotation;

The photosensitive drum includes a drum and a rotational force transmitting assembly mounted at one axial end of the drum;

It is characterized by:

The rotational force transmitting assembly is the rotational force transmitting assembly of any one of claims 1 to 4.
A process cartridge according to Claim 8 wherein:

Also includes a deviation mechanism;

The rotational force transmitting head is provided with a force receiving section for receiving a force forcing the rotational force transmitting head to rotate relative to the drum gear about a predetermined angular range about the rotational axis;

When the two rotational force receiving teeth are in the disengaged coupling state, the biasing mechanism applies a force to the force receiving section to force the rotational force transmitting head to rotate to the two rotational force receiving teeth to be offset from the rotation axis. Scalloped surface

The apex of the scallop is on the axis of rotation, and the bisector of the scallop is arranged parallel to the insertion direction of the process cartridge to the main body.
A process cartridge according to Claim 8 wherein:

Also includes a deviation mechanism;

The rotational force transmitting head is provided with a force receiving section for receiving a force forcing the rotational force transmitting head to rotate relative to the drum gear about a predetermined angular range about the rotational axis;

When the two rotational force receiving teeth are in the disengaged coupling state, the biasing mechanism applies a force to the force receiving section to force the rotational force transmitting head to rotate to the connection between the two rotational force receiving teeth and the process box a position having an angle between the insertion directions of the main body;

The included angle is from 45 degrees to 135 degrees.