WO2017032042A1 - 单向驱动机构、动力传送装置及图像形成装置 - Google Patents

单向驱动机构、动力传送装置及图像形成装置 Download PDF

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Publication number
WO2017032042A1
WO2017032042A1 PCT/CN2016/081034 CN2016081034W WO2017032042A1 WO 2017032042 A1 WO2017032042 A1 WO 2017032042A1 CN 2016081034 W CN2016081034 W CN 2016081034W WO 2017032042 A1 WO2017032042 A1 WO 2017032042A1
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WIPO (PCT)
Prior art keywords
driving
transmission
driven
way
drive
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Application number
PCT/CN2016/081034
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English (en)
French (fr)
Inventor
王长生
夏巨政
何新超
Original Assignee
珠海赛纳打印科技股份有限公司
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Publication of WO2017032042A1 publication Critical patent/WO2017032042A1/zh

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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
    • 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
    • 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
    • G03G21/1661—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
    • G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
    • G03G2221/1651—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts for connecting the different parts
    • G03G2221/1657—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts for connecting the different parts transmitting mechanical drive power

Definitions

  • the present invention relates to power transmission structure technology, and more particularly to a one-way drive mechanism, a power transmission device, and an image forming device.
  • the image forming apparatus can be classified into a hitting type, an inkjet type, and an electronic imaging type according to the imaging principle. According to these three different principles, the image forming apparatus can be classified into a ribbon printer, an inkjet (Ink) printer, and a laser. (Laser) printer. Regardless of which of the image forming apparatuses described above, a paper feed unit, an image forming unit, a fixing unit, and a paper discharge unit are usually provided inside.
  • the one-way driving mechanism is an important component widely used in an image forming apparatus, and is generally used to provide a rotational driving force for a paper feeding unit, an image forming unit, a fixing unit, and a paper discharge unit.
  • FIG. 1 is a schematic structural view showing a state in which a unidirectional driving mechanism is engaged
  • FIG. 2 is a structural schematic view showing a state in which a unidirectional driving mechanism is separated.
  • the one-way driving mechanism includes a power input portion 81, a power transmitting portion 82, and a power output portion 83.
  • the power input portion 81, the power transmitting portion 82, and the power output portion 83 are sequentially sleeved on the shaft 84.
  • the power input unit 81 is meshed with the drive gear 90 for receiving the rotational driving force of the drive gear 90.
  • the power input portion 81 is provided with a driving groove 86.
  • the 85 can be embedded in the transmission groove 87, and the transmission groove 87 and the driven projection 85 are respectively provided with inclined faces which can generate an interaction force in the axial direction of the shaft 84. Further, a return spring 89 is further provided between the power transmission unit 82 and the power output unit 83.
  • the working principle of the one-way driving mechanism is as follows: as shown in FIG. 1, when the driving gear 90 drives the power input portion 81 to rotate in the positive direction R, the inclined surface on the driving groove 86 facing the transmission projection 88 generates an axial direction. The thrust pushes the power transmission portion 82 toward the power in the axial direction The output portion 83 moves, the thrust is greater than the elastic force of the return spring 89, and the return spring 89 is compressed until the driven projection 85 is fitted into the transmission groove 87, so that the power transmission portion 82 is engaged with the power output portion 83, and the power input portion 81 is realized.
  • the power output unit 83 transmits a rotational driving force.
  • the ramp on the drive slot 86 no longer generates an axis on the ramp on the drive projection 88.
  • the power transmission portion 82 moves in the axial direction toward the power input portion 81 by the return elastic force of the return spring 89 until the driven projection 85 completely leaves the transmission groove 87, thereby realizing the power transmission portion 82 and the power output.
  • the portion 83 is separated, the power input portion 81 no longer transmits the rotational driving force to the power output portion 83.
  • the return spring in the one-way driving mechanism may cause fatigue or wear after long-term use, causing the return spring force of the return spring to be weakened, thereby causing the power transmission portion 82 to be unable to normally engage or disengage with the power output portion 83, so that the one-way The drive mechanism fails and the service life is shortened.
  • the invention provides a one-way driving mechanism, a power transmission device and an image forming device, which do not require an additional return spring to extend the service life of the one-way driving mechanism.
  • An embodiment of the present invention provides a one-way driving mechanism, including: a support shaft, and a driving portion, a transmission portion, and a driven portion that are sequentially sleeved on the support shaft;
  • One end of the driving portion facing the transmission portion is provided with a first driving structure for driving the transmission portion to move toward the driven portion in the axial direction and engaging with the driven portion, and driving the transmission portion to move toward the driving portion in the axial direction and to a first retracting structure separating the moving parts;
  • a second driving structure corresponding to the first driving structure and a second retracting structure corresponding to the first retracting structure are disposed at one end of the transmission portion facing the driving portion.
  • a further embodiment of the present invention provides a power transmission device including a driving source and two unidirectional driving mechanisms as described above; wherein, when any one of the two unidirectional driving mechanisms is in a power engaged state, The other one-way driving mechanism is in a power split state; the driving portions of the two one-way driving mechanisms are all connected to the driving source; the driven portions of the two one-way driving mechanisms are connected to each other.
  • Another embodiment of the present invention provides an image forming apparatus including: a driving mechanism, and a minute a first drive system and a second drive system connected to the drive mechanism; wherein the first drive system comprises a one-way drive mechanism as described above, the drive mechanism is coupled to the drive portion of the one-way drive mechanism; the second drive The system includes a power transfer device as described above, the drive mechanism being coupled to a drive source in the power transfer device.
  • the first driving structure and the first retracting structure are disposed on the driving portion, and the second driving structure and the second retracting structure are disposed on the transmission portion, and the first driving structure and the first driving structure are provided.
  • the two driving structure cooperates to drive the transmission portion to move toward the driven portion in the axial direction to engage with the driven portion, and the cooperation of the first retracting structure and the second retracting structure can drive the transmission portion to drive in the axial direction.
  • the part moves and is separated from the driven part.
  • the one-way driving mechanism provided by the above solution does not need to provide additional springs and the like, and the driving part and the driven part cannot be normally engaged due to spring fatigue or wear. Or the separation occurs, ensuring the normal operation of the one-way drive mechanism and prolonging its service life.
  • FIG. 1 is a schematic structural view of a conventional one-way driving mechanism in an engaged state
  • FIG. 4 is a cross-sectional view of a one-way driving mechanism according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic structural diagram of a driving part in a one-way driving mechanism according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic structural view of a transmission portion in a one-way driving mechanism according to Embodiment 1 of the present invention.
  • FIG. 8 is a schematic structural diagram of a first state before a one-way driving mechanism is not activated according to Embodiment 1 of the present invention.
  • FIG. 10 is a schematic structural diagram of a third state during a rotation of a one-way driving mechanism in a first direction according to Embodiment 1 of the present invention.
  • FIG. 11 is a schematic structural diagram of a first state in a reverse direction rotation of a one-way driving mechanism in a first direction according to Embodiment 1 of the present invention.
  • FIG. 12 is a diagram showing the reverse direction of the one-way driving mechanism in the first direction according to the first embodiment of the present invention. Schematic diagram of the second state during the movement;
  • FIG. 13 is another schematic structural diagram of a one-way driving mechanism according to Embodiment 1 of the present invention.
  • FIG. 14 is a schematic structural view showing formation of an inclined surface in a one-way driving mechanism according to Embodiment 1 of the present invention.
  • FIG. 16 is a schematic structural diagram of a one-way driving mechanism according to Embodiment 3 of the present invention.
  • FIG. 17 is a schematic structural view showing a driving source in a first direction in a power transmission device according to Embodiment 4 of the present invention.
  • FIG. 18 is a schematic structural view showing a driving source in a power transmission device according to Embodiment 4 of the present invention, which is rotated in a direction opposite to a first direction;
  • the embodiment provides a one-way driving mechanism, which has a simple structure and can not only satisfy the normal operation of the one-way driving mechanism but also prolong the service life without adding additional parts.
  • a first driving structure is disposed on one end of the driving portion 110 facing the transmission portion 130, and the first driving structure is configured to drive the transmission portion 130 to move toward the driven portion 120 in the axial direction, so that the transmission portion 130 and the driven portion 120 are moved.
  • the driving portion 110 is further provided with a first retracting structure toward the end of the transmission portion 130, and the first retracting structure is configured to drive the transmission portion 130 to move toward the driving portion 110 in the axial direction, so that the transmission portion 130 and the driven portion are driven. 120 separation.
  • a second driving structure corresponding to the first driving structure is disposed on one end of the driving portion 130 toward the driving portion 110, and the transmission portion 130 is oriented in the axial direction by the cooperation of the first driving structure and the second driving structure.
  • the driven portion 120 moves.
  • a second retracting structure corresponding to the first retracting structure is further disposed on the end of the driving portion 130 toward the driving portion 110, and the transmission portion 130 is axially realized by the cooperation of the first retracting structure and the second retracting structure. The direction moves toward the driving portion 110.
  • the above-mentioned driving portion 110 and the transmission portion 130 can realize the process of moving the power transmission portion 82 in the axial direction in the prior art, without additionally adding components such as springs, and shortening the use of the one-way driving mechanism due to spring fatigue. The problem of life.
  • FIG. 5 is a schematic structural diagram of a driving part in a one-way driving mechanism according to Embodiment 1 of the present invention.
  • one end of the driving portion 110 is for connection with a driving source, and receives a rotational force in a first direction or a rotational force in a direction opposite to the first direction from a driving source.
  • the other end of the driving portion 110 is provided with a driving boss 111 as a first driving structure.
  • the driving boss 111 is located on one side of the axis and extends in the circumferential direction, and the opposite ends of the driving boss 111 in the circumferential direction are respectively A first driving surface 112 and a first inclined surface 113 are provided.
  • FIG. 6 is a schematic structural diagram of a transmission portion in a one-way driving mechanism according to Embodiment 1 of the present invention.
  • the transmission portion 130 is disposed at one end of the driving portion 110 to accommodate the driving boss 111.
  • the driving portion 110 When the driving portion 110 receives the rotational force of the driving source in the first direction, the end of the first driving surface 112 is in contact with the third inclined surface 134, and a force is applied to the third inclined surface 134.
  • the force is perpendicular to the third inclined surface 134 and can be decomposed into a force in the circumferential direction and an axial force along the support shaft 140, wherein an axial force along the support shaft 140 can push the transmission portion 130 toward the driven portion 120.
  • the direction of movement Until the first driving surface 112 is in contact with the second driving surface 133.
  • the first driving surface 112 applies a circumferential force to the second driving surface 133 to push the transmission portion 130 to rotate in the first direction.
  • the first inclined surface 113 is in contact with the second inclined surface 132 and the force is applied to the second inclined surface 132 when the driving portion 110 receives the rotational force of the driving source in a direction opposite to the first direction.
  • the force is perpendicular to the second inclined surface 132 and can be decomposed into a force in the circumferential direction and an axial force, wherein the axial force can drive the transmission portion 130 to move toward the driving portion 110.
  • an engagement transmission portion is disposed on one end of the transmission portion 130 toward the driven portion 120, and correspondingly, the transmission portion 120 is driven toward the transmission portion 120.
  • One end of the portion 130 is provided with an engagement follower that engages or disengages with the engagement transmission portion, so that the transmission portion 130 approaches the driven portion 120 during the rotation of the driving portion 110 in the first direction, and the upper end of the transmission portion 130 engages the transmission portion
  • the engagement portion is in contact with the engagement portion on the driven portion 120, and the engagement transmission portion applies a rotational force to the engagement follower portion, and the drive follower portion 120 rotates in the first direction, which corresponds to the engagement of the transmission portion 130 with the driven portion 120.
  • the transmission portion 130 is away from the driven portion 120 until the engaging transmission portion is completely separated from the engaging driven portion, and both are rotated in the circumferential direction. No mutual interference occurs.
  • the first driving surface 112 and the first inclined surface 113 are disposed on the driving portion 110, and the second inclined surface 132 matching the first inclined surface 113 is disposed on the transmission portion, and the first driving surface 112 is disposed.
  • the second driving surface 133 and the third inclined surface 134 are engaged, and the first driving surface 112 is applied to the third inclined surface 134 during the rotation of the driving portion 110 in the first direction.
  • the force is applied to move the transmission portion 130 toward the driven portion 120 until the engagement transmission portion on the transmission portion 130 engages with the engagement driven portion on the driven portion 120, and the first driving surface 112 is directed to the second driving surface 133.
  • the one-way driving mechanism provided by the above solution does not need to be provided with additional springs and the like, and there is no possibility that the driving portion and the driven portion cannot be normally engaged or separated due to spring fatigue or wear, thereby ensuring one-way operation.
  • the normal operation of the drive mechanism extends its service life.
  • the first driving surface 112 and the first inclined surface 113 are disposed on the driving boss 111.
  • the positional relationship may be implemented in various manners.
  • the second driving surface 133, the second inclined surface 132, and the third inclined surface 134 are provided.
  • the side wall of the first transmission groove can be disposed in various ways. The following solution provides a specific implementation of the drive portion 110 and the transmission portion 130, and the implementation of the follower portion 120:
  • FIG. 7 is a schematic structural diagram of a driven portion in a one-way driving mechanism according to Embodiment 1 of the present invention
  • FIG. 8 is a schematic structural diagram of a first state before a one-way driving mechanism is not activated according to Embodiment 1 of the present invention
  • FIG. FIG. 10 is a schematic structural diagram of a second state during a rotation of a one-way driving mechanism in a first direction according to Embodiment 1 of the present invention
  • FIG. 10 is a third embodiment of the first-direction driving mechanism according to the first embodiment of the present invention.
  • the driving portion 110, the transmission portion 130, and the driven portion 120 are sleeved and mounted on the support shaft 140, and the driving portion 110 and the driven portion 120 can only rotate in the circumferential direction of the support shaft 140.
  • the transmission portion 130 is rotatable both in the circumferential direction and in the axial direction.
  • the driving portion 110 and the driven portion 120 are both cylindrical structures, and the circumferential outer wall is provided with gears for engaging with other gear members to receive or output a rotational force.
  • the drive bushing 115 may be disposed at the center of the driving portion 110, and the driven shaft may be disposed at the center of the driven portion 120.
  • the sleeve 124, the transmission portion 130 is directly fitted over the support shaft 140 and slid and rotated between the drive sleeve 115 and the driven sleeve 124. Since the axial lengths of the drive bushing 115 and the driven bushing 124 are minimum according to the design specifications, if the drive bushing 115 is still to be driven And the space in which the transmission portion 130 is slid between the driven bushings 124 inevitably increases the length of the one-way driving mechanism.
  • the mounting hole 138 at the center of the transmission portion 130 is set to be large, so that the driving sleeve 115 and the driven sleeve 124 can be inserted into the mounting hole 138.
  • the driving sleeve 115 and the driven shaft are driven.
  • the shaft ends of the sleeves 124 are in contact with each other, but are not fixedly connected.
  • the mounting holes 138 are sleeved on the driving sleeve 115 and the driven sleeve 124, and the transmission portion 130 can slide and rotate on the driving sleeve 115 and the driven sleeve 124.
  • the drive bushing 115 and the driven bushing 124 are not affected to rotate on the support shaft 140.
  • the driving unit 110 is connected to the driving source.
  • the driving unit 110 is provided with a driving boss 111 on one end surface thereof.
  • the end surface of the transmission portion 130 is provided with a driving convex corresponding to the driving boss 111 .
  • the number of the driving bosses 111 may be one, or two or more than two, and two or more than two driving bosses 111 are evenly distributed in the circumferential direction.
  • the number of the transmission bosses 131 may be two or more than two, and the first transmission grooves are formed between the two transmission bosses 131, and the side walls of the first transmission grooves correspond to the end faces of the transmission bosses 131.
  • the fourth driving surface 122 and the driven protrusion 121 are further provided with a fifth inclined surface 123 that can be guided and slid with respect to the fourth inclined surface 137.
  • the transmission portion 130 can drive the driven portion 120 to rotate.
  • the driving portion 110 when the driving portion 110 is rotated in the first direction (in the S direction in FIG. 9), the front end of the driving boss 111 is in contact with the third inclined surface 134, and a force is applied to the third inclined surface 134.
  • the driving portion 130 is moved in the direction (T direction) toward the driven portion 120 until the driving boss 111 comes into contact with the second driving surface 133, and the transmission portion 130 stops moving in the T direction.
  • the transmission projection 135 gradually protrudes between the two driven projections 121 on the driven portion 120.
  • the transmission portion 130 is fully engaged with the driven portion 120, and the axial movement is stopped.
  • the first driving surface 112 applies a circumferential direction to the second driving surface 133.
  • the force of the driving portion 110 pushes the transmission portion 130 to rotate in the S direction.
  • the third driving surface 136 applies a circumferential force to the fourth driving surface 122 such that the driven portion 120 follows the transmission portion 130 in the S direction, that is, the one-way driving mechanism is in the power engaged state.
  • the transmission portion 130 can no longer move axially and is located farthest from the driving portion 110. At this position, as shown in FIG.
  • the bottommost point of the first inclined surface 113 is It is higher than the highest point of the second inclined surface 132, so as to ensure that the first inclined surface 113 can be in contact with the second inclined surface 132 when the subsequent driving portion 110 is rotated in the opposite direction of the first direction, so that the driving boss 131 can be driven.
  • the boss 111 is pulled back, so that the transmission portion 130 is engaged with the driving portion 110.
  • the transmission portion 130 can slide in the axial direction instead of being driven only by the driving portion 110, and can be on the top surface of the driving boss 111 and the driving boss
  • the top surface of the 131 is provided with a recessed portion, such as the recessed portion 114 on the top surface of the drive boss 111 shown in FIG. 5, to reduce the friction between the top surface of the drive boss 111 and the body of the transmission portion 130, Similarly, a recessed portion may be provided on the top surface of the drive boss 131 to reduce the friction between the top surface of the drive boss 131 and the body of the drive portion 110.
  • each of the driving faces is generally planar, specifically a plane that is coplanar with the center line of the support shaft 140 (referred to as a straight surface), or may be a slope with a small inclination, and the straight surface can make the driving force more concentrated.
  • the inclined surface may be a flat surface, a twisted surface or a curved surface, and the function of the transmission portion 130 is to receive thrust in both axial and radial directions.
  • This embodiment provides an implementation of another one-way driving mechanism based on the above embodiments. Specifically, the difference from the above embodiment is that the engagement transmission portion in the transmission portion 130 and the engagement follower portion in the driven portion 120 are different in implementation, and the rest are the same as the above embodiment.
  • FIG. 15 is a schematic structural diagram of a one-way driving mechanism according to Embodiment 2 of the present invention.
  • the transmission portion 130 is provided with a transmission protrusion 135, and the transmission protrusion 135 is provided with a third driving surface 136.
  • the driven portion 120 is provided with the driven groove 125, and the side wall of the driven groove 125 is provided with the third driving surface abutting to receive the driving force applied by the third driving surface 136.
  • Four drive faces 122 are provided.
  • the technical solution provided by the embodiment provides a first driving structure and a first retracting structure on the driving portion, and correspondingly, the second driving structure and the second retracting structure are disposed on the driving portion, and the driving portion 110 is oriented in the first direction.
  • the first driving structure and the second driving structure cooperate to push the transmission portion 130 to move toward the driven portion 120 until the transmission protrusion on the transmission portion 130 and the driven groove on the driven portion 120.
  • both the transmission portion 130 and the driven portion 120 are rotated in the first direction by the driving portion 110; during the rotation of the driving portion 110 in the opposite direction to the first direction, the first retracting structure and the first The cooperation of the two retracting structures causes the transmission portion 130 to move toward the driving portion 110 until the transmission projection on the transmission portion 130 is separated from the driven recess on the driven portion 120, causing the driven portion 120 to no longer receive the driving.
  • the rotational driving force of the portion 110 The one-way driving mechanism provided by the above solution does not need to be provided with additional springs and the like, so that the situation that the driving portion 110 and the driven portion 120 cannot be normally engaged or separated due to spring fatigue or wear occurs is ensured.
  • the normal operation of the one-way drive mechanism extends its service life.
  • This embodiment provides an implementation of another one-way driving mechanism based on the above embodiments. Specifically, the difference from the above embodiment is that the engagement transmission portion in the transmission portion 130 and the engagement follower portion in the driven portion 120 are different in implementation, and the rest are the same as the above embodiment.
  • the transmission portion 130 gradually approaches the driven portion 120, and the driven protrusion 121 protrudes into the second transmission groove 139, and the third driving surface 136 abuts against the fourth driving.
  • a force in the first direction is applied to the fourth driving surface 122 to drive the driven portion 120 to rotate in the first direction.
  • FIG. 17 is a schematic structural diagram of a driving source in a power transmission device according to Embodiment 4 of the present invention, wherein FIG. 18 is a rotation of a driving source in a direction opposite to a first direction in a power transmission device according to Embodiment 4 of the present invention; Schematic.
  • the present embodiment provides a power transmitting apparatus including the one-way driving mechanism provided by the two embodiments described above, wherein either one of the two one-way driving mechanisms is powered In the engaged state, the other one-way drive mechanism is in a power split state, and the drive portions in the two one-way drive mechanisms are The driving source is connected; the driven portions of the two one-way driving mechanisms are connected to each other.
  • the two one-way driving mechanisms are the first driving mechanism 10 and the second driving mechanism 20, wherein when any one of the first one-way driving mechanism 10 and the second one-way driving mechanism 20 is in the power-engaged state, The other drive mechanism is in a power split state.
  • the second driving mechanism 20 when the driving source 40 is rotated in a direction S' opposite to the first direction, the second driving mechanism 20 is in a power connection state, and the driving force of the driving source 40 passes through the second driving portion 21 and the second transmission portion. 22 is transmitted to the second driven portion 23, and the second driven portion 23 drives the first driven portion 13 to rotate. Since the first drive mechanism 10 is in the power split state, even if the first follower portion 13 rotates along with the second follower portion 23, interference does not occur between the first follower portion 13 and the first transmission portion 12.
  • a moving mechanism such as a roller is attached to the first driven portion 13 or the second driven portion 23, and the power transmitting device of the present invention can realize the moving mechanism regardless of whether the driving source rotates in the S direction or the S' direction. They are always able to keep turning in one direction.
  • the above embodiment provides an embodiment in which a one-way driving mechanism and two one-way driving mechanisms are combined.
  • the one-way driving mechanism of the present invention can also perform three or A combination of four.
  • the driven parts of the two unidirectional driving mechanisms may be directly externally engaged or may be connected by other transmission methods.
  • a transmission gear is further disposed between the two driven parts, and the specific connection manner may be according to actual conditions. Make settings.
  • the power transmission device provided in this embodiment is connected to the driving source by using the two-way driving mechanism provided by the two embodiments, and can maintain one of the one-way driving mechanisms in any direction regardless of the driving direction of the driving source, and the other single Separated from the drive mechanism, two unidirectional drive mechanisms are applied to the drive system, and a drive source can meet the different requirements of the drive system, thereby simplifying the structure of the drive system, reducing the number of parts, reducing costs, and reducing the overall drive system. volume.
  • FIG. 19 is a schematic structural diagram of an image forming apparatus according to Embodiment 5 of the present invention
  • FIG. 20 is a schematic structural diagram 1 of a structure in which a one-way driving mechanism, a power transmitting apparatus, and each driving system are connected in an image forming apparatus according to Embodiment 5 of the present invention
  • 21 is a schematic structural diagram of a structure in which a one-way driving mechanism and a power transmitting device are connected to respective driving systems in an image forming apparatus according to Embodiment 5 of the present invention.
  • a driving system installed outside the image forming apparatus frame is shown.
  • Figure 2 shows the drive system mounted inside the frame of the image forming apparatus.
  • the image forming apparatus includes a driving mechanism, a paper feeding unit 2, an image forming unit 3, a fixing unit 4, a paper discharge unit 5, a duplex printing unit 6, a paper feed cassette 7, A first drive system for driving the paper feed unit 2 and the image forming unit 3, and a second drive system for driving the fixing unit 4, the paper discharge unit 5, and the duplex printing unit 6.
  • the driving mechanism is specifically a driving motor 1 and may further include a driving motor 1 and a transmission mechanism.
  • the paper in the paper feed cassette 7 is conveyed by the paper feed unit 2 and conveyed by the conveyance roller, enters the image forming unit 3 to perform image forming processing of the toner image, and then enters the fixing unit 4 to fix the toner image, and the fixed paper is discharged through the paper discharge.
  • Unit 5 is discharged to the paper tray.
  • the image forming apparatus In the image forming apparatus, and entering the double-sided printing unit 6 via the paper return path behind the device, the front and back sides of the paper are turned, and then the image forming unit 3, the fixing unit 4, and the paper discharge unit 5 are successively imaged, fixed, and discharged. .
  • Each of the above units is powered by the drive motor 1, and the drive motor 1 of the present embodiment is capable of forward and reverse rotation, that is, rotating in the first direction or in a direction opposite to the first direction.
  • the driving force of the driving motor 1 is divided into two parts, a part for driving the first driving system of the paper feeding unit 2 and the image forming unit 3, and another part for driving the fixing unit 4, the paper discharge unit 5, and the second of the duplex printing unit 6 Drive System.
  • the drive motor 1 is coupled to the first drive system and the second drive system, respectively.
  • the first drive system includes the one-way drive mechanism provided by the above embodiment, and is referred to as a third drive mechanism 30.
  • the drive motor 1 is coupled to the drive portion of the third drive mechanism 30.
  • the third drive mechanism 30 includes a third drive portion 31, a third transmission portion (not shown), and a third driven portion 32.
  • the second drive system includes the power transmitting device as provided in the above embodiments, including the first drive mechanism 10 and the second drive mechanism 20.
  • the drive motor 1 is connected to a drive source in the power transmission device. The implementation of the first drive system and the second drive system will be described below with reference to FIGS. 18 to 20.
  • the output end of the drive motor 1 is coupled to the third drive mechanism 30, specifically to the third drive portion 31 of the third drive mechanism 30.
  • the third follower portion 32 is connected to the photosensitive drum drive gear 3a of the image forming unit 3, so that the driving force of the drive motor 1 is transmitted to the photosensitive drum drive gear 3a through the third drive mechanism 30.
  • the photosensitive drum drive gear 3a is connected to the paper feed gear 2a of the paper feed unit 2 via an idle gear, and therefore, the driving force of the drive motor 1 is transmitted to the paper feed gear 2a through the photosensitive drum drive gear 3a and the idle gear.
  • the third drive mechanism 30 can transmit power to the paper feed unit 2 and the image forming unit 3; when the drive motor 1 is reversed, the third drive mechanism 30 cannot transfer power to the paper feed unit 2 and Imaging unit 3.
  • the above-described one power transmission device is used, including the first drive mechanism 10 and the second drive mechanism 20.
  • the output end of the drive motor 1 is connected to the drive source 40, and the drive source 40 is simultaneously connected to the first drive portion 11 of the first drive mechanism 10 and the second drive portion 21 of the second drive mechanism 20.
  • the first driving portion 11 is connected to the paper discharge gear 5a of the paper discharge unit 5 via the idle gear such that the rotation direction of the paper discharge gear 5a corresponds to the rotation direction of the drive motor 1, and when the drive motor 1 rotates forward, The paper discharge gear 5a is rotated forward; when the drive motor 1 is reversed, the paper discharge gear 5a is reversed.
  • the manner in which the second driving portion 21 is connected to the paper discharge unit 5 may be employed.
  • the first driven portion 13 is connected not only to the second driven portion 23 but also to the heat roller gear 4a of the fixing unit 4, and the second driven portion 23 is also connected to the double-sided gear 6a of the duplex printing unit 6 to be fixed.
  • the heating roller gear 4a of the unit 4 is connected to the driving gear of the conveying roller on the paper return path.
  • the image forming apparatus can realize a printing operation of paper feeding, conveying, image forming, fixing, and paper discharge in a state where the driving motor 1 is rotated forward.
  • the third drive mechanism 30 and the first drive mechanism 10 are in a disengaged state, and the second drive mechanism 20 is in an engaged state. Therefore, the driving force of the drive motor 1 cannot be transmitted to the paper feed unit 2 and the image forming unit 3.
  • the first driving portion 11 of the first driving mechanism 10 transmits the driving force to the paper discharge unit 5, but since the driving motor 1 is reversed, the paper discharge unit 5 is also reversed, that is, the paper returning operation of the paper is started, Before the paper leaves the discharge unit 5, the paper can enter the paper path of the duplex printing unit 6 by the reversal of the discharge unit 5.
  • the driving force of the drive motor 1 is transmitted to the fixing unit 4 through the second drive mechanism 20 and the first driven portion 13, while the second drive mechanism 20 transmits the drive force to both sides.
  • Printing unit 6. In the state where the drive motor 1 is reversed, the image forming apparatus can realize the paper return operation. In this state, the image forming unit 3 does not operate, so that the load of the drive motor 1 can be reduced and the amount of toner leakage can be reduced.
  • the control system controls the drive motor 1 from the reverse to the forward rotation. , causing the third drive mechanism 30 to become a power connection state, thereby enabling imaging
  • the unit is operated to perform an image forming operation; and the first drive mechanism 10 is brought into a power-connected state, whereby the fixing unit 4 and the draining unit 5 are operated to perform a fixing and draining operation.
  • the image forming apparatus of the present invention is provided with a paper sensor 8 on the transport path in front of the image forming unit 3.
  • the paper is reversed by the duplex printing unit 6, and the paper advances toward the image forming unit 3 along the paper path of the duplex printing unit 6.
  • a control signal is sent to the control system in the image forming apparatus to cause the control system to control the drive motor 1 to change from reverse rotation to forward rotation.
  • the image forming unit 3 and the fixing unit 4 perform image printing on the reverse side of the paper, and then discharge through the drain unit 5.
  • the paper sensor 8 can also be placed at other locations on the paper path, such as inside the duplex unit 6.
  • the drive system in the image forming apparatus of the present invention has a function not only for realizing a paper returning operation of paper.
  • the temperature of the fixing unit 4 is cooled to a normal temperature, and when the image forming apparatus receives the print job instruction, the fixing unit 4 is started to perform warming up, and at the same time, the heating roller of the fixing unit 4 rotates. To conduct temperature.
  • the first driving system and the second driving system can be simultaneously operated; when the image forming apparatus performs the paper returning operation, the first driving system stops working, and the second driving system operates,
  • the specific implementation manner may refer to the above content, or may be implemented by a technician to design a transmission relationship.
  • the control system controls the activation of the driving motor, which causes all the driving systems connected to the driving motor to be activated, and also includes the imaging unit 3.
  • the driving motor which causes all the driving systems connected to the driving motor to be activated
  • the imaging unit 3 since there is no paper input and paper feed in the image forming apparatus during the preheating of the fixing unit 4, once the image forming unit 3 is activated, the output and leakage of the toner are caused, resulting in waste and contamination, especially when the printer is frequent.
  • the above shortcomings are more serious when intermittent start-up and standby.
  • the image forming apparatus can control the forward and reverse rotation of the drive motor, and can prevent the operation of the image forming unit 3 when the drive motor is reversed, and can drive the fixing unit 4 to operate for warming up, thereby avoiding
  • the above problems existing in the prior art do not lead to waste caused by toner leakage, on the one hand, saving toner material, and on the other hand, avoiding leakage of toner on the inside of the image forming apparatus and affecting the imaging effect.
  • the one-way driving mechanism and the power transmitting device in the image forming apparatus it is possible to realize a series of complicated operations of paper feeding, conveying, image forming, fixing, paper discharging, and paper returning of the printer, and not only the above-described one-way driving mechanism is provided.
  • the technical effect is that, compared with the method of separating or combining power using electrical components in the prior art, the parts are saved, the structure is simplified, the cost of the product can be reduced, and the volume of the whole machine is further miniaturized.

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Abstract

一种单向驱动机构、动力传送装置及图像形成装置，其中，单向驱动机构包括：支撑轴（140），以及依次套设在支撑轴（140）上的驱动部（110）、传动部（130）和从动部（120）；其中，驱动部（110）上朝向传动部（130）的一端设有用于驱使传动部（130）沿轴向方向朝向从动部（120）移动并与从动部（120）接合的第一驱动结构，以及驱使传动部（130）沿轴向方向朝向驱动部（110）移动并与从动部（120）分离的第一回退结构；传动部（130）上朝向驱动部（110）的一端设有与第一驱动结构对应的第二驱动结构，以及与第一回退结构对应的第二回退结构。单向驱动机构不需要额外的复位弹簧，从而延长了使用寿命。

Description

单向驱动机构、动力传送装置及图像形成装置 技术领域
本发明涉及动力传送结构技术，尤其涉及一种单向驱动机构、动力传送装置及图像形成装置。
背景技术
图像形成装置按照成像原理可以分为击打式、喷墨式、电子成像式，按照这三种不同的原理，图像形成装置可以分为色带(Ribbon)打印机、喷墨(Ink)打印机、激光(Laser)打印机。无论上述哪一种图像形成装置，其内部通常设置有给纸单元、成像单元、定影单元和排纸单元。
单向驱动机构是广泛应用于图像形成装置中的一个重要部件，通常用于为给纸单元、成像单元、定影单元和排纸单元提供旋转驱动力。
图1为现有的一种单向驱动机构接合状态的结构示意图，图2为现有的一种单向驱动机构分离状态的结构示意图。如图1和图2所示，单向驱动机构包括动力输入部81、动力传送部82和动力输出部83，动力输入部81、动力传送部82和动力输出部83依次套设在轴84上。其中，动力输入部81与驱动齿轮90啮合，用于接收驱动齿轮90的旋转驱动力。动力输入部81上设有驱动槽86，对应在动力传送部82的一端部设有传动凸起88，传动凸起88的形状和尺寸与驱动槽86匹配，传动凸起88可嵌入驱动槽86内，且驱动槽86和传动凸起88上分别设置有可以在轴84的轴向方向产生相互作用力的斜面。动力传送部82的另一端部设有传动槽87，对应在动力输出部83的一端部设有从动凸起85，从动凸起85的形状和尺寸与传动槽87匹配，从动凸起85可嵌入传动槽87内，且传动槽87和从动凸起85上分别设置有可以在轴84的轴向方向产生相互作用力的斜面。另外，在动力传送部82和动力输出部83之间还设有复位弹簧89。
上述单向驱动机构的工作原理为：如图1所示，当驱动齿轮90驱动动力输入部81沿正方向R转动时，驱动槽86上的斜面对传动凸起88上的斜面产生轴向方向的推力，推动动力传送部82在轴向方向朝向动力输 出部83移动，上述推力大于复位弹簧89的弹性力，压缩复位弹簧89，直至从动凸起85嵌入传动槽87内，实现动力传送部82与动力输出部83接合，实现动力输入部81向动力输出部83传送旋转驱动力。
如图2所示，当驱动齿轮90驱动动力输入部81沿R的反方向转动时，或者是驱动齿轮90停止转动时，驱动槽86上的斜面不再对传动凸起88上的斜面产生轴向方向的推力，则动力传送部82在复位弹簧89的复位弹力作用下在轴向方向朝向动力输入部81移动，直至从动凸起85完全离开传动槽87，实现动力传送部82与动力输出部83分离，则动力输入部81不再向动力输出部83传送旋转驱动力。
上述单向驱动机构中的复位弹簧在长期使用之后会产生疲劳或发生磨损，导致复位弹簧的复位弹力作用减弱，进而导致动力传送部82不能够与动力输出部83正常接合或分离，使得单向驱动机构失效，缩短了使用寿命。
发明内容
本发明提供一种单向驱动机构、动力传送装置及图像形成装置，不需要额外的复位弹簧，以延长单向驱动机构的使用寿命。
本发明实施例提供一种单向驱动机构，包括：支撑轴，以及依次套设在支撑轴上的驱动部、传动部和从动部；其中，
驱动部上朝向传动部的一端设有用于驱使传动部沿轴向方向朝向从动部移动并与从动部接合的第一驱动结构，以及驱使传动部沿轴向方向朝向驱动部移动并与从动部分离的第一回退结构；
传动部上朝向驱动部的一端设有与第一驱动结构对应的第二驱动结构，以及与第一回退结构对应的第二回退结构。
本发明又一实施例提供一种动力传送装置，包括驱动源、如上所述的两个单向驱动机构；其中，两个单向驱动机构中的任一个单向驱动机构处于动力接合状态时，另一个单向驱动机构处于动力分离状态；两个单向驱动机构中的驱动部均与驱动源连接；两个单向驱动机构中的从动部相互连接。
本发明另一实施例提供一种图像形成装置，包括：驱动机构、以及分 别与驱动机构连接的第一驱动系统及第二驱动系统；其中，第一驱动系统包括如上所述的单向驱动机构，所述驱动机构与单向驱动机构中的驱动部连接；第二驱动系统包括如上所述的动力传送装置，所述驱动机构与动力传送装置中的驱动源连接。
本发明实施例提供的技术方案，通过在驱动部上设置第一驱动结构和第一回退结构，对应在传动部上设置第二驱动结构和第二回退结构，通过第一驱动结构和第二驱动结构配合能够驱使传动部在轴向方向朝向从动部移动进而与从动部接合，而通过第一回退结构与第二回退结构的配合能够驱使传动部在轴向方向上朝向驱动部移动，进而与从动部分离，上述方案所提供的单向驱动机构不需要设置额外的弹簧等部件，也就不会出现由于弹簧疲劳或发生磨损而导致驱动部和从动部不能正常接合或分离的情况出现，保证了单向驱动机构的正常运行，延长其使用寿命。
附图说明
图1为现有的一种单向驱动机构接合状态的结构示意图；
图2为现有的一种单向驱动机构分离状态的结构示意图；
图3为本发明实施例一提供的单向驱动机构的分解视图；
图4为本发明实施例一提供的单向驱动机构的剖视图；
图5为本发明实施例一提供的单向驱动机构中驱动部的结构示意图；
图6为本发明实施例一提供的单向驱动机构中传动部的结构示意图；
图7为本发明实施例一提供的单向驱动机构中从动部的结构示意图；
图8为本发明实施例一提供的单向驱动机构未启动前的第一状态的结构示意图；
图9为本发明实施例一提供的单向驱动机构沿第一方向转动过程中的第二状态的结构示意图；
图10为本发明实施例一提供的单向驱动机构沿第一方向转动过程中的第三状态的结构示意图；
图11为本发明实施例一提供的单向驱动机构沿第一方向的反方向转动过程中的第一状态的结构示意图；
图12为本发明实施例一提供的单向驱动机构沿第一方向的反方向转 动过程中的第二状态的结构示意图；
图13为本发明实施例一提供的单向驱动机构的另一结构示意图；
图14为本发明实施例一提供的单向驱动机构中倾斜面形成的结构示意图；
图15为本发明实施例二提供的单向驱动机构的结构示意图；
图16为本发明实施例三提供的单向驱动机构的结构示意图；
图17为本发明实施例四提供的动力传送装置中驱动源沿第一方向转动的结构示意图；
图18为本发明实施例四提供的动力传送装置中驱动源沿与第一方向相反方向转动的结构示意图；
图19为本发明实施例五提供的图像形成装置的结构示意图；
图20为本发明实施例五提供的图像形成装置中单向驱动机构、动力传送装置与各驱动系统连接的结构示意图一；
图21为本发明实施例五提供的图像形成装置中单向驱动机构、动力传送装置与各驱动系统连接的结构示意图二。
具体实施方式
本实施例提供一种单向驱动机构，其结构较为简单，在不增加额外零件的前提下，不但能满足单向驱动机构的正常运行，其使用寿命也得到了延长。
图3为本发明实施例一提供的单向驱动机构的分解视图，图4为本发明实施例一提供的单向驱动机构的剖视图。如图3和图4所示，本实施例提供的单向驱动机构包括：支撑轴140，以及依次套设在支撑轴140上的驱动部110、传动部130和从动部120。驱动部110、传动部130和从动部120一般设置成圆柱状，轴心处设置轴孔用于插入支撑轴140。
驱动部110上朝向传动部130的一端设有第一驱动结构，该第一驱动结构用于驱使传动部130在轴向方向上朝向从动部120移动，以使传动部130与从动部120接合。驱动部110朝向传动部130的一端还设有第一回退结构，该第一回退结构用于驱使传动部130在轴向方向上朝向驱动部110移动，以使传动部130与从动部120分离。本实施例所提到的轴向方 向，指的是支撑轴140的轴心延伸的方向。
对应的，在传动部130上朝向驱动部110的一端设有与第一驱动结构对应的第二驱动结构，通过第一驱动结构与第二驱动结构的配合实现传动部130在轴向方向上朝向从动部120移动。在传动部130上朝向驱动部110的一端还设有与第一回退结构对应的第二回退结构，通过第一回退结构和第二回退结构的配合，实现传动部130在轴向方向上朝向驱动部110移动。
采用上述驱动部110和传动部130就可以实现现有技术中的动力传送部82沿轴向移动的过程，不需要额外增加弹簧等部件，也不会出现因弹簧疲劳而缩短单向驱动机构使用寿命的问题。
本实施例提供的技术方案，通过在驱动部110上设置第一驱动结构和第一回退结构，对应在传动部130上设置第二驱动结构和第二回退结构，通过第一驱动结构和第二驱动结构配合能够驱使传动部130在轴向方向朝向从动部120移动进而与从动部120接合，而通过第一回退结构与第二回退结构的配合能够驱使传动部130在轴向方向上朝向驱动部110移动，进而与从动部120分离，上述方案所提供的单向驱动机构不需要设置额外的弹簧等部件，也就不会出现由于弹簧疲劳或发生磨损而导致驱动部110和从动部120不能正常接合或分离的情况出现，保证了单向驱动机构的正常运行，延长其使用寿命。
对于上述驱动部110、传动部130和从动部120，本实施例提供一种具体的实现方式：
图5为本发明实施例一提供的单向驱动机构中驱动部的结构示意图。如图5所示，驱动部110的一端用于与驱动源连接，从驱动源处接收沿第一方向的转动作用力或沿与第一方向相反的转动作用力。驱动部110的另一端设有作为第一驱动结构的驱动凸台111，驱动凸台111位于轴心一侧，且沿圆周方向延伸，驱动凸台111沿圆周方向的相对的两个端面上分别设置有第一驱动面112和第一倾斜面113。不过，由于驱动凸台111为凸出的结构，相应的，其外周侧为凹陷的结构，形成凹槽，因此，第一驱动面112和第一倾斜面113也可以理解为是设在凹槽的侧壁面上。
图6为本发明实施例一提供的单向驱动机构中传动部的结构示意图。如图6所示，传动部130朝向驱动部110的一端设有可容纳驱动凸台111 的第一传动凹槽，该第一传动凹槽作为第二驱动结构，第一传动凹槽沿圆周方向的相对的两个侧壁上分别设置有与第一倾斜面113配合的第二倾斜面132，以及与第一驱动面112配合的第二驱动面133和第三倾斜面134。
当驱动部110接收驱动源的转动作用力朝第一方向转动的过程中，上述第一驱动面112的端部与第三倾斜面134接触，并且向第三倾斜面134施加作用力，该作用力垂直于第三倾斜面134，能够分解为沿圆周方向的作用力和沿支撑轴140的轴向作用力，其中，沿支撑轴140的轴向作用力能够推动传动部130朝向从动部120的方向移动。直至第一驱动面112与第二驱动面133接触。则驱动部110继续朝第一方向转动的过程中，第一驱动面112向第二驱动面133施加圆周方向的作用力，推动传动部130向第一方向转动。
当驱动部110接收驱动源的转动作用力朝与第一方向相反的方向转动的过程中，上述第一倾斜面113与第二倾斜面132接触，且向第二倾斜面132施加作用力，该作用力垂直于第二倾斜面132，能够分解为沿圆周方向的作用力和轴向作用力，其中，轴向作用力能够带动传动部130朝向驱动部110的方向移动。
而对于传动部130与从动部120之间的结构关系，可以采用如下方式：在传动部130上朝向从动部120的一端设置有接合传动部，对应的，在从动部120上朝向传动部130的一端设置有与接合传动部接合或分离的接合从动部，以使驱动部110向第一方向转动的过程中，传动部130靠近从动部120，且传动部130上端接合传动部与从动部120上的接合从动部接触，且接合传动部向接合从动部施加转动作用力，驱动从动部120沿第一方向转动，相当于传动部130与从动部120接合。而在驱动部110向与第一方向相反的方向转动的过程中，传动部130远离从动部120，直至接合传动部与接合从动部完全分离，且在圆周方向上转动的过程中二者不发生相互干涉。
上述技术方案，通过在驱动部110上设置第一驱动面112和第一倾斜面113，对应在传动部上设置与第一倾斜面113配合的第二倾斜面132，以及与第一驱动面112配合的第二驱动面133和第三倾斜面134，在驱动部110向第一方向转动的过程中，第一驱动面112向第三倾斜面134施加 作用力，推动传动部130朝向从动部120的方向移动，直至传动部130上的接合传动部与从动部120上的接合从动部接合，则第一驱动面112向第二驱动面133施加作用力，促使传动部130和从动部120均在驱动部110的带动下向第一方向转动；在驱动部110向与第一方向相反的方向转动的过程中，第一倾斜面113向第二倾斜面132施加作用力，使得传动部130朝向驱动部110的方向移动，直至传动部130上的接合传动部与从动部120上的接合从动部分离，促使从动部120不再接收驱动部110的旋转驱动力。上述方案所提供的单向驱动机构不需要设置额外的弹簧等部件，也就不会出现由于弹簧疲劳或发生磨损而导致驱动部和从动部不能正常接合或分离的情况出现，保证了单向驱动机构的正常运行，延长其使用寿命。
上述第一驱动面112和第一倾斜面113设置在驱动凸台111上，其位置关系可以有多种实现方式，对应的，第二驱动面133、第二倾斜面132以及第三倾斜面134设置在第一传动凹槽的侧壁，其位置关系也可以有多种实现方式。下面的方案提供一种驱动部110和传动部130的具体实现方式，以及从动部120的实现方式：
图7为本发明实施例一提供的单向驱动机构中从动部的结构示意图，图8为本发明实施例一提供的单向驱动机构未启动前的第一状态的结构示意图，图9为本发明实施例一提供的单向驱动机构沿第一方向转动过程中的第二状态的结构示意图，图10为本发明实施例一提供的单向驱动机构沿第一方向转动过程中的第三状态的结构示意图。
如图1至图10所示，驱动部110、传动部130和从动部120套设并安装在支撑轴140上，驱动部110和从动部120只能沿支撑轴140的圆周方向转动，而传动部130既能沿圆周方向转动，又能沿轴向滑动。驱动部110和从动部120均为圆柱状结构，圆周外壁上设有齿轮，用于与其它齿轮部件啮合以接收或输出转动作用力。
为了使驱动部110、传动部130和从动部120能够稳定地在支撑轴140上运转，可以在驱动部110的中心设置驱动轴套115，且在从动部120的中心也设置从动轴套124，传动部130直接套装在支撑轴140上且在驱动轴套115和从动轴套124之间滑动和转动。由于驱动轴套115和从动轴套124的轴向长度按照设计规格是有最小值要求的，如果还要在驱动轴套115 以及从动轴套124之间预留传动部130滑动的空间，则不可避免地会增加单向驱动机构的长度，因此，为了能够减小整个单向驱动机构的长度，使产品能够小型化，本实施例将传动部130中心处的安装孔138设置得较大，以使得驱动轴套115、从动轴套124能够插入安装孔138内，如图4所示，驱动轴套115以及从动轴套124的轴端相互接触，但不固定连接，安装孔138套在驱动轴套115以及从动轴套124上，传动部130能够在驱动轴套115以及从动轴套124上滑动和转动，同时，不影响驱动轴套115以及从动轴套124在支撑轴140上转动。
如图5和图6所示，驱动部110与驱动源连接，驱动部110的一端面上设有驱动凸台111，对应的，传动部130的端面设有与驱动凸台111对应的传动凸台131。其中，驱动凸台111的数量可以为一个，也可以为两个或多于两个，两个或多于两个驱动凸台111沿圆周方向均匀分布。传动凸台131的数量可以为两个或多于两个，两个传动凸台131之间形成上述第一传动凹槽，第一传动凹槽的侧壁相当于传动凸台131的端面。
驱动凸台111的沿圆周方向的两侧端面上分别设有第一驱动面112和第一倾斜面113，传动凸台131的沿圆周方向的两侧端面上分别设有与第一倾斜面113对应的第二倾斜面132，以及与第一驱动面112配合的第二驱动面133及第三倾斜面134。第一倾斜面113朝向驱动部110的本体部分，第二倾斜面132则朝向传动部130的本体部分，形成两个方向相反的倒钩形状，从而能够起到相互拉动的作用。
如图6和图7所示，从动部120的端面上设有从动凸起121，该从动凸起121相当于上述接合从动部；传动部130的另一端面设有与从动凸起121对应的传动凸起135，该传动凸起135相当于上述接合传动部。传动凸起135上设有第三驱动面136以及第四倾斜面137，上述从动凸起121设有与第三驱动面136配合抵接以接收第三驱动面136施加的驱动作用力的第四驱动面122，从动凸起121上还设有可相对第四倾斜面137进行导向滑动的第五倾斜面123。通过第三驱动面136向第四驱动面122施加转动作用力，可实现传动部130带动从动部120转动。
上述单向驱动机构的工作过程为：
如图8所示，单向驱动机构处于初始状态，在该状态下，传动部130 贴近驱动部110，传动部130与从动部120完全分离，传动凸起135的顶端与从动部120的顶端不会产生干涉。
如图9所示，当驱动部110沿第一方向(如图9中的S方向)转动时，驱动凸台111的前端与第三倾斜面134接触，并且向第三倾斜面134施加作用力，推动传动部130朝向从动部120的方向(T方向)移动，直至驱动凸台111与第二驱动面133接触之后，传动部130停止向T方向移动。同时，在传动部130向T方向移动的过程中，传动凸起135逐渐伸入从动部120上的两个从动凸起121之间。
如图10所示，传动部130与从动部120完全接合，并停止轴向移动，驱动部110继续朝第一方向转动的过程中，第一驱动面112向第二驱动面133施加圆周方向的作用力，使得驱动部110推动传动部130向S方向转动。并且，第三驱动面136对第四驱动面122施加圆周方向的作用力，使得从动部120跟随传动部130向S方向转动，即单向驱动机构处于动力接合状态。在此状态下，传动部130无法再进行轴向移动，并位于离驱动部110最远的位置，在该位置处时，如图10所示的角度，第一倾斜面113的最底点要比第二倾斜面132的最高点高，这样才能保证后续驱动部110沿第一方向的反方向转动时，第一倾斜面113能够与第二倾斜面132接触，使传动凸台131能够被驱动凸台111拉回，从而传动部130与驱动部110接合。
图11为本发明实施例一提供的单向驱动机构沿第一方向的反方向转动过程中的第一状态的结构示意图，图12为本发明实施例一提供的单向驱动机构沿第一方向的反方向转动过程中的第二状态的结构示意图。如图11所示，当驱动部110向与第一方向相反的方向(S’方向)转动的过程中，上述第一倾斜面113与第二倾斜面132接触，且向第二倾斜面132施加作用力，在第一倾斜面113与第二倾斜面132相对滑动的过程中使得驱动部110能够带动传动部130朝向驱动部110的方向(T’方向)移动，直至传动凸起135和从动凸起121分离，即单向驱动机构处于动力分离状态，如图12所示。
与上述实施方式不同，本实施例又提供一种驱动部110和传动部130的实现方式：图13为本发明实施例一提供的单向驱动机构的另一结构示 意图。如图13所示，第三倾斜面134也可以设置在驱动部110上，当驱动部110在第一方向转动时，第二驱动面133的端部与第三倾斜面134接触，第二驱动面133的端部受到第三倾斜面134的轴向以及径向的推力，同时进行轴向移动以及径向转动。
上述传动部130上的传动凸起135的数量可以为一个、两个或多于两个，两个或多于两个传动凸起135可以沿圆周方向均匀分布。从动部120上的从动凸起121的数量可以为一个、两个或多于两个，两个或多于两个从动凸起121可以沿圆周方向均匀分布，以保证整个单向驱动机构受力均匀。
进一步的，为了保证驱动部110在第一方向上转动时，传动部130能够在轴向上滑动，而不是被驱动部110带动只进行转动，可以在驱动凸台111的顶面以及传动凸台131的顶面都设置有凹陷部分，例如图5所示的位于驱动凸台111顶面的凹陷部分114，以减小驱动凸台111的顶面与传动部130的本体之间的摩擦力，同理，也可以在传动凸台131的顶面设置凹陷部分，以减小传动凸台131的顶面与驱动部110本体之间的摩擦力。
为了能够进一步减小单向驱动机构的长度，本实施例中的驱动部110的一端面向内部凹陷，形成凹坑，使得驱动部110类似桶状，驱动凸台111位于该凹坑的底部，传动部130能够沿着支撑轴140滑动进入或离开该凹坑，从而起到减小机构长度的作用，同时在不降低机构强度的情况下，减少了产品的材料及重量。当然，从动部120也是可以采用这种结构设计的。
另外，上述各驱动面一般平面，具体为与支撑轴140的中心线共面的平面(称其为直面)，或者也可以是斜度较小的斜面，而直面能够使驱动力更加集中。上述倾斜面可以是平面、扭曲的面或者是弧面，其作用是使传动部130受到轴向以及径向两个方向的推力。
上述各倾斜面的倾斜角度及其形状均可以根据各倾斜面之间以及驱动面和倾斜面之间的配合关系来设定。本实施例提供一种倾斜面形成的具体方式：
图14为本发明实施例一提供的单向驱动机构中倾斜面形成的结构示意图。如图14所示，倾斜面P可以按照如下方式形成：以支撑轴140的轴心为圆心形成两个同心圆A、B，以轴心为端点的并沿轴的径向延伸的直线L，绕轴转动的同时，沿轴向移动，该直线L在两个同心圆A、B之间的区域扫过形成一个连续的曲面，从而形成了倾斜面P。通过这种方式 形成的倾斜面P，能够保证当两个倾斜面P相互抵触时，作用在倾斜面P上的力F始终垂直于上述直线L，从而使单向驱动机构的运转更加稳定。
对于上述传动凸起135，其上也可以不设置第四倾斜面137，而是将第四倾斜面137替换为直面。
上述技术方案，通过在驱动部110上设置第一驱动面112和第一倾斜面113，对应在传动部上设置与第一倾斜面113配合的第二倾斜面132，以及与第一驱动面112配合的第二驱动面133和第三倾斜面134，在驱动部110向第一方向转动的过程中，第一驱动面112向第三倾斜面134施加作用力，推动传动部130朝向从动部120的方向移动，直至传动部130上的传动凸起与从动部120上的从动凸起接合，则第一驱动面112向第二驱动面133施加作用力，促使传动部130和从动部120均在驱动部110的带动下向第一方向转动；在驱动部110向与第一方向相反的方向转动的过程中，第一倾斜面113向第二倾斜面132施加作用力，使得传动部130朝向驱动部110的方向移动，直至传动部130上的传动凸起与从动部120上的从动凸起分离，促使从动部130不再接收驱动部110的旋转驱动力。上述方案所提供的单向驱动机构不需要设置额外的弹簧等部件，也就不会出现由于弹簧疲劳或发生磨损而导致驱动部110和从动部130不能正常接合或分离的情况出现，保证了单向驱动机构的正常运行，延长其使用寿命。
另外，对于上述驱动部110设置的第一驱动结构和第一回退结构，以及传动部130上的第二驱动结构和第二回退结构，本领域技术人员可以将第一驱动结构与第二驱动结构进行互换，即将第一驱动结构设置在传动部130上，将第二驱动结构设置在驱动部110上，以及将第一回退结构和第二回退结构进行互换，并加以适当的结构修改和调整，同样也能实现上述实施例中的功能。
实施例二
本实施例是在上述实施例的基础上，提供另一种单向驱动机构的实现方式。具体的，与上述实施例的区别在于，本实施例所提供的传动部130中的接合传动部和从动部120中的接合从动部的实现方式不同，其余部分均与上述实施例相同。
图15为本发明实施例二提供的单向驱动机构的结构示意图。如图15 所示，传动部130上设置有传动凸起135，传动凸起135上设置有第三驱动面136。对应的，在从动部120上设有从动凹槽125，且从动凹槽125的侧壁设有与第三驱动面配合抵接以接收第三驱动面136施加的驱动作用力的第四驱动面122。
当驱动部110向第一方向转动时，传动部130逐渐向从动部120靠近，并且传动凸起135伸入从动凹槽125内，且第三驱动面136抵接在第四驱动面122上，并对第四驱动面122施加第一方向的作用力，以带动从动部120向第一方向转动。
当驱动部110向与第一方向相反的方向转动时，传动部130逐渐远离从动部120，直至传动凸起135从从动凹槽125中脱出，实现传动部130与从动部120分离。
本实施例提供的技术方案，通过在驱动部上设置第一驱动结构和第一回退结构，对应在传动部上设置第二驱动结构和第二回退结构，在驱动部110向第一方向转动的过程中，通过第一驱动结构和第二驱动结构配合，推动传动部130朝向从动部120的方向移动，直至传动部130上的传动凸起与从动部120上的从动凹槽接合，则传动部130和从动部120均在驱动部110的带动下向第一方向转动；在驱动部110向与第一方向相反的方向转动的过程中，通过第一回退结构与第二回退结构的配合，使得传动部130朝向驱动部110的方向移动，直至传动部130上的传动凸起与从动部120上的从动凹槽分离，促使从动部120不再接收驱动部110的旋转驱动力。上述方案所提供的单向驱动机构不需要设置额外的弹簧等部件，也就不会出现由于弹簧疲劳或发生磨损而导致驱动部110和从动部120不能正常接合或分离的情况出现，保证了单向驱动机构的正常运行，延长其使用寿命。
实施例三
本实施例是在上述实施例的基础上，提供另一种单向驱动机构的实现方式。具体的，与上述实施例的区别在于，本实施例所提供的传动部130中的接合传动部和从动部120中的接合从动部的实现方式不同，其余部分均与上述实施例相同。
图16为本发明实施例三提供的单向驱动机构的结构示意图。如图16所示，传动部130上设置有第二传动凹槽139，第二传动凹槽139上设置 有第三驱动面136。对应的，在从动部120上设有从动凸起121，且从动凸起121上设置有与第三驱动面136配合抵接以接收第三驱动面136施加的驱动作用力的第四驱动面122。
当驱动部110向第一方向转动时，传动部130逐渐向从动部120靠近，并且从动凸起121伸入第二传动凹槽139内，且第三驱动面136抵接在第四驱动面122上，并对第四驱动面122施加第一方向的作用力，以带动从动部120向第一方向转动。
当驱动部110向与第一方向相反的方向转动时，传动部130逐渐远离从动部120，直至从动凸起121从第二传动凹槽139中脱出，实现传动部130与从动部120分离。
本实施例提供的技术方案，通过在驱动部110上设置第一驱动结构和第一回退结构，对应在传动部130上设置第二驱动结构和第二回退结构，在驱动部110向第一方向转动的过程中，通过第一驱动结构和第二驱动结构配合，推动传动部130朝向从动部120的方向移动，直至传动部130上的第二传动凹槽与从动部120上的从动凸起接合，则传动部130和从动部120均在驱动部110的带动下向第一方向转动；在驱动部110向与第一方向相反的方向转动的过程中，通过第一回退结构与第二回退结构的配合，使得传动部130朝向驱动部110的方向移动，直至传动部130上的第二传动凹槽与从动部120上的从动凸起分离，促使从动部120不再接收驱动部110的旋转驱动力。上述方案所提供的单向驱动机构不需要设置额外的弹簧等部件，也就不会出现由于弹簧疲劳或发生磨损而导致驱动部110和从动部120不能正常接合或分离的情况出现，保证了单向驱动机构的正常运行，延长其使用寿命。
实施例四
图17为本发明实施例四提供的动力传送装置中驱动源沿第一方向转动的结构示意图，图18为本发明实施例四提供的动力传送装置中驱动源沿与第一方向相反方向转动的结构示意图。如图17和18所示，本实施例提供一种动力传送装置，包括两个上述实施例所提供的单向驱动机构，其中，两个单向驱动机构中的任一个单向驱动机构处于动力接合状态时，另一个单向驱动机构处于动力分离状态，两个单向驱动机构中的驱动部均与 驱动源连接；两个单向驱动机构中的从动部相互连接。
具体的，两个单向驱动机构为第一驱动机构10和第二驱动机构20，其中，第一单向驱动机构10和第二单向驱动机构20中任一个驱动机构处于动力接合状态时，另一个驱动机构处于动力分离状态。
第一驱动机构10包括第一驱动部11、第一传动部12、和第一从动部13，分别采用上述实施例所提供的驱动部110、传动部130和从动部120所提供的实现方式，此处不再赘述。第二驱动机构20包括第二驱动部21、第二传动部22和第二从动部23，分别采用上述实施例所提供的驱动部110、传动部130和从动部120所提供的实现方式，此处不再赘述。
第一驱动部11及第二驱动部21可以直接与驱动源40啮合，也可以通过中间传动机构与驱动源40啮合。具体的，第一驱动部11及第二驱动部21均与驱动源40外啮合，以使第一驱动部11及第二驱动部21与驱动源40的转动方向相反。第一从动部13与第二从动部23外啮合，以使第一从动部13和第二从动部23的转动方向相反。
将第一驱动机构10中的倾斜面与第二驱动机构20中相对应的倾斜面的倾斜方向设置为相反的，以使得第一驱动机构10与第二驱动机构20的工作状态是相反的，即，使得驱动源40同时驱动两个单向驱动机构转动时，始终保证只有一个单向驱动机构是处于动力连接的状态，另一个单向驱动机构则处于动力分离状态。
如图17所示，当驱动源40沿第一方向S转动时，第一驱动机构10处于动力连接状态，驱动源40的驱动力通过第一驱动部11、第一传动部12传送至第一从动部13，由于第一从动部13与第二从动部23啮合，第二从动部23也随之转动，且转动方向与第一从动部13相反。第二驱动机构20则处于动力分离状态，因此即使第二从动部23随着第一从动部13转动，第二从动部23与第二传动部22之间也不会发生干涉。
如图18所示，当驱动源40沿与第一方向相反的方向S’转动时，第二驱动机构20处于动力连接状态，驱动源40的驱动力通过第二驱动部21、第二传动部22传送至第二从动部23，第二从动部23带动第一从动部13转动。由于第一驱动机构10处于动力分离状态，因此即使第一从动部13随着第二从动部23转动，第一从动部13与第一传动部12之间也不会发生干涉。
在第一从动部13或第二从动部23上安装辊轮等运动机构，通过本发明的动力传送装置，就能够实现，不管驱动源沿S方向转动或者是S’方向转动，运动机构都能够始终保持在一个方向转动。
根据以上内容可知，上述实施例提供了使用一个单向驱动机构以及两个单向驱动机构组合的实施方式，当然，根据驱动系统的控制需求，本发明的单向驱动机构还能够进行三个或四个的组合。
上述两个单向驱动机构中的从动部可以直接外啮合，也可以通过其它传动方式进行连接，例如：两个从动部之间还设置有传动齿轮，其具体的连接方式可根据实际情况进行设定。
本实施例提供的动力传送装置，采用两个上述实施例所提供的单向驱动机构分别与驱动源连接，且无论驱动源沿哪个方向转动均能保持其中一个单向驱动机构接合，另一个单向驱动机构分离，两个单向驱动机构应用到驱动系统中，通过一个驱动源就能满足驱动系统的不同要求，进而简化驱动系统的结构，减少零件数量，降低成本，也缩小驱动系统整体的体积。
实施例五
图19为本发明实施例五提供的图像形成装置的结构示意图，图20为本发明实施例五提供的图像形成装置中单向驱动机构、动力传送装置与各驱动系统连接的结构示意图一，图21为本发明实施例五提供的图像形成装置中单向驱动机构、动力传送装置与各驱动系统连接的结构示意图二，具体的，示意图一中显示了在图像形成装置框架外侧安装的驱动系统，示意图二显示了在图像形成装置框架内侧安装的驱动系统。如图19至图21所示，本实施例提供的图像形成装置包括驱动机构、给纸单元2、成像单元3、定影单元4、排纸单元5、双面打印单元6、给纸盒7、用于驱动给纸单元2和成像单元3的第一驱动系统、以及用于驱动定影单元4、排纸单元5和双面打印单元6的第二驱动系统。其中，驱动机构具体为驱动马达1，还可以包括驱动马达1以及传动机构。
给纸盒7中的纸张通过给纸单元2搓送以及搬送辊搬送，进入成像单元3进行碳粉图像的成像处理，然后进入定影单元4对碳粉图像进行固定，完成定影的纸张通过排纸单元5排放至纸盘。有些需要进行双面打印的纸张，在纸张未完全脱离排纸单元5的时候，排纸单元5反向转动，将纸张抽回图 像形成装置内，并经由装置后方的回纸路径进入双面打印单元6，使纸张的正反面调转，再先后进入成像单元3、定影单元4及排纸单元5完成成像、固定以及排出的操作。
上述各单元由驱动马达1提供动力，本实施例中的驱动马达1能够实现正转及反转，即沿第一方向转动或沿与第一方向相反的方向转动。驱动马达1的驱动力分开两部分，一部分用于驱动给纸单元2及成像单元3的第一驱动系统，另一部分用于驱动定影单元4、排纸单元5和双面打印单元6的第二驱动系统。
在本实施例中，驱动马达1分别与上述第一驱动系统和第二驱动系统连接。其中，第一驱动系统包括上述实施例所提供的单向驱动机构，称之为第三驱动机构30，驱动马达1与第三驱动机构30的驱动部连接。第三驱动机构30包括第三驱动部31、第三传动部(图中未示出)以及第三从动部32。第二驱动系统包括如上述实施例所提供的动力传送装置，包括第一驱动机构10和第二驱动机构20。驱动马达1与动力传送装置中的驱动源连接。以下结合图18至图20对第一驱动系统、第二驱动系统的实现方式进行描述。
在第一驱动系统中，驱动马达1的输出端连接第三驱动机构30，具体与第三驱动机构30的第三驱动部31连接。第三从动部32与成像单元3的感光鼓驱动齿轮3a连接，这样，驱动马达1的驱动力就通过第三驱动机构30传送至感光鼓驱动齿轮3a。感光鼓驱动齿轮3a与给纸单元2的给纸齿轮2a之间通过惰轮连接，因此，驱动马达1的驱动力再通过感光鼓驱动齿轮3a和惰轮传递给给纸齿轮2a。
当驱动马达1正转时，第三驱动机构30能够将动力传送至给纸单元2以及成像单元3；当驱动马达1反转时，第三驱动机构30无法将动力传送至给纸单元2以及成像单元3。
在第二驱动系统中，使用了上述一个动力传送装置，包括第一驱动机构10和第二驱动机构20。驱动马达1的输出端与驱动源40连接，驱动源40同时连接至第一驱动机构10的第一驱动部11以及第二驱动机构20的第二驱动部21。第一驱动部11通过惰轮与排纸单元5的排纸齿轮5a连接，使得排纸齿轮5a的转动方向与驱动马达1的转动方向相对应，当驱动马达1正转时， 排纸齿轮5a正转；当驱动马达1反转时，排纸齿轮5a反转。当然，根据实际产品的构造，也可以采用第二驱动部21与排纸单元5连接的方式。
第一从动部13不仅与第二从动部23连接，还与定影单元4的加热辊齿轮4a连接，第二从动部23还与双面打印单元6的双面打齿轮6a连接，定影单元4的加热辊齿轮4a与回纸路径上的搬送辊的驱动齿轮连接。通过前述对动力传送装置的工作原理描述可知，无论驱动马达1正转还是反转，定影单元4、双面打印单元6以及回纸路径的搬送辊各自都是保持在同一个方向转动的。
综上所述，对于整个图像形成装置而言，当驱动马达1正转时，第一驱动机构10和第三驱动机构30处于接合状态，而第二驱动机构20处于分离状态。则驱动马达1的驱动力通过第三驱动机构30传送至给纸单元2以及成像单元3，通过第一驱动部11传送至排纸单元5，通过第一驱动机构10传送至定影单元4，同时，由于第一从动部13与第二从动部23连接，第二从动部23与双面打印单元6连接，因此，驱动力就通过第一从动部13、第二从动部23被传送至双面打印单元6。图像形成装置在驱动马达1正转的状态下，能够实现纸张的给纸、搬送、成像、定影以及排纸的打印操作。
当驱动马达1反转时，第三驱动机构30和第一驱动机构10处于分离状态，而第二驱动机构20处于接合状态。因此，驱动马达1的驱动力不能够被传送至给纸单元2以及成像单元3。第一驱动机构10的第一驱动部11将驱动力传送至排纸单元5，但是由于驱动马达1是反转的，因此，排纸单元5也是反转的，即开始纸张的回纸操作，在纸张未离开排扺单元5之前，纸张可以通过排扺单元5的反转进入双面打印单元6的走纸路径。由于第一驱动机构10是动力分离状态，驱动马达1的驱动力通过第二驱动机构20、第一从动部13传送至定影单元4，同时，第二驱动机构20将驱动力传送至双面打印单元6。图像形成装置在驱动马达1反转的状态下，能够实现纸张的回纸操作，在该状态下，成像单元3没有运转，因此能够降低驱动马达1的负荷，并减少碳粉泄漏的量。
当纸张在图像形成装置中回纸到一定位置时，具体为，纸张的末端离开了排纸单元5，但是纸张的前端未到达成像单元3之前，控制系统控制驱动马达1从反转变向正转，使第三驱动机构30变成动力连接状态，从而使成像 单元运转，进行成像操作；以及使第一驱动机构10变为动力连接状态，从而使定影单元4和排扺单元5运转，进行定影和排扺操作。
具体的，为了检测纸张在图像形成装置中的位置，本发明的图像形成装置在成像单元3前方的搬送路径上设置有纸张感应器8。在排扺单元5反转的过程中，通过双面打印单元6将纸张翻转，纸张沿着双面打印单元6的走纸路径朝向成像单元3前进。当该纸张感应器8感应到纸张的前端时，向图像形成装置内的控制系统发送控制信号，以使控制系统控制驱动马达1由反向转动改为正向转动。则成像单元3、定影单元4实现对纸张的反面进行图像印制，然后通过排扺单元5排出。
当然，纸张感应器8还可以设置在走纸路径上的其它位置，例如在双面打印单元6内部。
另外，本发明的图像形成装置中的驱动系统，其功能不仅仅是用于实现纸张的回纸操作。当图像形成装置在待机过程中，定影单元4的温度会冷却到常温，当图像形成装置收到打印作业指令时，会启动定影单元4进行预热升温，同时，定影单元4的加热辊会转动，以对温度进行传导。
上述图像形成装置在进行给纸操作时，能够实现第一驱动系统及第二驱动系统可以同时工作；当图像形成装置进行回纸操作时，第一驱动系统停止工作，第二驱动系统工作，其具体的实现方式可参照上述内容，也可以由技术人员对传动关系进行设计来实现。
现有技术中，为了驱动定影单元4的加热辊转动，控制系统会控制驱动马达启动，这样就会带动与驱动马达相连的所有驱动系统都启动，也包括成像单元3在内。但是，由于定影单元4预热过程中，图像形成装置中并没有纸张输入和走纸，因此，成像单元3一旦启动，就会导致碳粉的输出以及泄漏，造成浪费和污染，尤其当打印机频繁、间歇的启动和待机时，上述缺点就会更加严重。
而上述技术方案所提供的图像形成装置，能够通过控制驱动马达的正反转，在驱动马达反转时，不驱动成像单元3运转，而能够驱动定影单元4运转进行预热升温，则避免了现有技术存在的上述问题，进而不会导致碳粉泄漏造成的浪费，一方面节约碳粉材料，另一方面避免了泄漏的碳粉对图像形成装置内部造成污染而影响成像效果。
另外，在图像形成装置中使用上述单向驱动机构以及动力传送装置，能够实现打印机的给纸、搬送、成像、定影、排纸及回纸一系列复杂的操作，不但具备上述单向驱动机构的技术效果，而且相对于现有技术中使用电气部件进行动力分离或结合的方式，更节省零件、使结构简单化，产品的成本能够降低，同时，整机的体积更加小型化。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (11)

  1. 一种单向驱动机构，其特征在于，包括：支撑轴，以及依次套设在支撑轴上的驱动部、传动部和从动部；其中，
    驱动部上朝向传动部的一端设有用于驱使传动部沿轴向方向朝向从动部移动并与从动部接合的第一驱动结构，以及驱使传动部沿轴向方向朝向驱动部移动并与从动部分离的第一回退结构；
    传动部上朝向驱动部的一端设有与第一驱动结构对应的第二驱动结构，以及与第一回退结构对应的第二回退结构。
  2. 根据权利要求1所述的单向驱动机构，其特征在于，所述第一驱动结构包括驱动凸台，所述驱动凸台上设置有第一驱动面和第一倾斜面；
    所述第二驱动结构包括可容纳驱动凸台的第一传动凹槽，所述第一传动凹槽内设置有与第一倾斜面配合的第二倾斜面，以及与第一驱动面配合的第二驱动面和第三倾斜面；
    驱动部在沿第一方向转动时，第一驱动面向第三倾斜面施加作用力，以驱使传动部沿轴向方向朝向从动部移动并与从动部接合；驱动部在沿第一方向的反方向转动时，第一倾斜面向第二倾斜面施加作用力，以使传动部沿轴向方向朝向驱动部移动并与从动部分离。
  3. 根据权利要求2所述的单向驱动机构，其特征在于，传动部上朝向从动部的一端设置有接合传动部，从动部上朝向传动部的一端设置有与接合传动部接合或分离的接合从动部。
  4. 根据权利要求3所述的单向驱动机构，其特征在于，所述接合传动部为传动凸起，传动凸起上设置有第三驱动面；
    所述接合从动部为从动凸起，从动凸起上设置有用于接收第三驱动面施加的驱动作用力的第四驱动面。
  5. 根据权利要求3所述的单向驱动机构，其特征在于，所述接合传动部为传动凸起，传动凸起上设置有第三驱动面；
    所述接合从动部为从动凹槽，从动凹槽的侧壁上设置有用于接收第三驱动面施加的驱动作用力的第四驱动面。
  6. 根据权利要求3所述的单向驱动机构，其特征在于，所述接合传动部为第二传动凹槽，第二传动凹槽设置有第三驱动面；
    所述接合从动部为从动凸起，从动凸起上设置有用于接收第三驱动面施加的驱动作用力的第四驱动面。
  7. 根据权利要求4所述的单向驱动机构，其特征在于，所述传动凸起上设置有第四倾斜面。
  8. 根据权利要求7所述的单向驱动机构，其特征在于，所述从动凸起上设有与第四倾斜面配合且对第四倾斜面起导向作用的第五倾斜面。
  9. 一种动力传送装置，其特征在于，包括驱动源、如权利要求1-8任一项所述的两个单向驱动机构；其中，两个单向驱动机构中的任一个单向驱动机构处于动力接合状态时，另一个单向驱动机构处于动力分离状态；
    两个单向驱动机构中的驱动部均与驱动源连接；两个单向驱动机构中的从动部相互连接。
  10. 一种图像形成装置，其特征在于，包括：驱动机构、以及分别与驱动机构连接的第一驱动系统及第二驱动系统；
    其中，第一驱动系统包括如权利要求1-8任一项所述的单向驱动机构，所述驱动机构与单向驱动机构中的驱动部连接；
    第二驱动系统包括如权利要求9所述的动力传送装置，所述驱动机构与动力传送装置中的驱动源连接。
  11. 如权利要求10所述的一种图像形成装置，其特征在于，当图像形成装置进行给纸操作时，第一驱动系统及第二驱动系统同时工作；当图像形成装置进行回纸操作时，第一驱动系统停止工作，第二驱动系统工作。
PCT/CN2016/081034 2015-08-25 2016-05-04 单向驱动机构、动力传送装置及图像形成装置 WO2017032042A1 (zh)

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