JP2007292099A - Driving transmission mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving transmission mechanism suitable for moving a load body on which a large load acts, without reducing the cost merit. <P>SOLUTION: The driving transmission mechanism has: an actuator 30 engaging with and disengaging from engaging parts 25 and 26 coaxially arranged with a tooth chipped gear 20 having tooth parts 21 and 22 meshing with an input gear 10 and tooth chipped parts 23 and 24, checking rotation of the tooth chipped gear 20 when engaged and allowing the rotation of the tooth chipped gear 20 when releasing engagement with the engaging parts 25 and 26; an energizing member 40 energizing the tooth chipped gear 20 in the direction meshing with the input gear 10; a cylindrical cam 27 rotating together with the tooth chipped gear 20; and a slider 50 interlocking with the cam 27 in the axial direction of the tooth chipped gear 20 in the orthogonal direction to a load vector F by the load body 60. A shape of the cam 27 is formed in a shape of not making force act on the slider 50 until a tooth part meshes with the input gear 10 when the tooth chipped gear 20 rotates by the energizing member 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drive transmission mechanism using a chipped gear.

A conventional drive transmission mechanism using a toothless gear has an input gear for inputting a driving force,
A tooth missing gear that has a tooth portion that meshes with the input gear and a tooth missing portion that does not mesh with the input gear, and the toothed portion meshes with the input gear,
An engagement portion provided coaxially with the chipped gear and rotating together with the chipped gear;
An actuator that engages with and disengages from the engaging portion, prevents rotation of the chipped gear when engaged with the engaging portion, and permits rotation of the chipped gear when disengaged from the engaging portion;
An operating means for engaging and disengaging the operating member with the engaging portion;
An urging member that urges the tooth-missing gear in a direction to mesh with the input gear when the tooth portion of the tooth-missing gear is not meshed with the input gear (for example, Patent Documents 1 and 2).

In such a drive transmission mechanism, when the actuator is disengaged from the engaging portion, the tooth-missing gear is rotated by the biasing force of the biasing member so that the tooth portion meshes with the input gear. Is a mechanism in which the power of the input gear is transmitted to the tooth-missing gear by rotating in mesh with the input gear. For example, a paper feed roller fixed to the shaft to which the tooth-missing gear is fixed is used during the paper feeding operation. It is used as a mechanism for exactly one rotation.
Japanese Patent Laid-Open No. 7-144742 JP-A-8-226517

The conventional drive transmission mechanism described above has an advantage of high cost performance, but is not suitable for moving a load body on which a large load acts. When a large load is applied to the chipped gear, a large biasing force is required for the biasing member for meshing the chipped gear with the input gear. This is because a large force is also required for the actuating means to be removed, so that the urging member and the actuating means are enlarged and the cost merit is lowered.
An object of the present invention is to solve the above-described problems and provide a drive transmission mechanism suitable for moving a load body to which a large load acts without reducing cost merit.

In order to achieve the above object, the drive transmission mechanism of the present invention includes an input gear for inputting a driving force,
A tooth missing gear that has a tooth portion that meshes with the input gear and a tooth missing portion that does not mesh with the input gear, and the toothed portion meshes with the input gear,
An engagement portion provided coaxially with the chipped gear and rotating together with the chipped gear;
An actuator that engages with and disengages from the engaging portion, prevents rotation of the chipped gear when engaged with the engaging portion, and permits rotation of the chipped gear when disengaged from the engaging portion;
An operating means for engaging and disengaging the operating member with the engaging portion;
An urging member that urges the tooth-missing gear in a direction to mesh with the input gear when a tooth portion of the tooth-missing gear is not meshed with the input gear;
A cylindrical cam coaxial with the chipped gear and rotating with the chipped gear;
A slider that slides in a direction orthogonal to a load vector by a load body and in the same direction as the axial direction of the chipped gear, and slides in conjunction with the cylindrical cam;
The shape of the cylindrical cam is such that no force is applied to the slider until the chipped gear rotates by the biasing force of the biasing member and the toothed portion of the chipped gear meshes with the input gear. It is characterized by being.
The cylindrical cam may have a shape that does not contact the slider until the tooth-missing gear rotates by the biasing force of the biasing member and the tooth portion of the tooth-missing gear meshes with the input gear.

With such a configuration, when the chipped gear is stopped, the chipped gear is not affected at all by the load vector of the load body. In addition, the shape of the cylindrical cam is such that no force is applied to the slider until the toothless gear rotates by the biasing force of the biasing member and the toothed portion of the toothless gear meshes with the input gear. Therefore, when the operating means is removed from the engaging portion by the operating means and the chipped gear is rotated by the biasing means to mesh with the input gear, no load is applied to the chipped gear.
Therefore, according to the present invention, even if a large load is applied to the slider, a large urging force is not required for the urging member for meshing the chipped gear with the input gear, Since a large force is not required for the operating means that removes the operating element that engages and disengages from the engaging part from the engaging part, the urging member and the operating means can be downsized to improve cost merit.
Further, by configuring the slider with a linear motion cam or the like for displacing a load body that applies the load to the slider, a load body with a large load can be moved.
As described above, according to the present invention, it is possible to move a load body on which a large load acts while improving cost merit (at least without reducing it).
Preferably, the shape of the cylindrical cam is such that the slider returns to its original position when the chipped gear rotates once.
If comprised in this way, the said slider can be reciprocated and the said load body can be moved repeatedly.

Hereinafter, embodiments of a drive transmission mechanism according to the present invention will be described with reference to the drawings.
FIG. 1 is a view showing an embodiment of a drive transmission mechanism according to the present invention, in which (a) is a perspective view, (b) is a plan view, (c) is a front view, and (d) is a side view. .
2 (1) to (3) and FIGS. 3 (4) and 5 (5) are diagrams showing the operation, and (1) to (5) are side views of the above mechanism as viewed from the front side. Is drawn on the right side.

As shown in FIGS. 1 and 2 (1), the drive transmission mechanism 1 includes an input gear 10 for inputting a driving force,
It has two tooth portions 21 and 22 that mesh with the input gear 10 and two tooth missing portions 23 and 24 that do not mesh with the input gear 10, and the tooth portions 21 and 22 mesh with the input gear 10 to be driven to rotate. Toothless gear 20,
Engaging portions 25, 26 that are provided coaxially with the chipped gear 20 and rotate together with the chipped gear 20;
When the engagement portions 25 and 26 are engaged with and disengaged from the engagement portions 25 and 26, the chipped gear 20 is prevented from rotating. An actuator 30 allowing rotation;
An operating means 31 for engaging and disengaging the operating element 30 with the engaging portions 25 and 26;
A biasing member 40 that biases the tooth missing gear 20 in a direction to mesh with the input gear 10 when the tooth portions 21 and 22 of the tooth missing gear 20 are not meshed with the input gear 10;
A cylindrical cam 27 rotating with the toothless gear 20;
A slider 50 that slides in the X1 and X2 directions perpendicular to the load vector F by the load body 60 and in the same direction as the axial direction of the tooth-missing gear 20, and slides in conjunction with the cylindrical cam 27; With
The shape of the cam 27 is such that no force is applied to the slider 50 until the tooth missing gear 20 is rotated by the biasing force of the biasing member 40 and the tooth portion of the tooth missing gear 20 meshes with the input gear 10. ing.
The cam 27 has spiral cam surfaces (cam portions) 27a and 27b. The shape of the cam 27 is such that the toothless gear 20 is rotated by the urging force of the urging member 40 and the toothed portion 21 of the toothless gear 20 is rotated. The slider 22 is not in contact with the input gear 10 until the gear 22 is engaged with the input gear 10.

The input gear 10 is rotatably supported by a frame of the drive transmission mechanism 1 or a frame (not shown) of an apparatus (for example, an image forming apparatus) in which the drive transmission mechanism 1 is incorporated. It is rotationally driven by a motor.
The tooth-missing gear 20 and the cylindrical cam 27 are rotatably supported on a shaft (not shown) provided on the frame.
The tooth missing gear 20 is a gear in which the tooth portions 21, 22, the tooth missing portions 23, 24, the boss portion 29a, the ring portion 29b, and the cylindrical cam 27 are integrally formed. Joint portions 25 and 26 are integrally provided.

The operating element 30 and the operating means 31 are constituted by a flapper solenoid attached to the frame.
The tip of the flapper that forms the actuator 30 is configured as a hook that engages with and disengages from the engaging portion 25 or 26, and the tip of the actuator 30 is connected to the engaging portion 25 or 26 between the rear end and the solenoid 31. A coil spring 32 (see FIG. 2 (1)) that is constantly urged in the engaging direction is provided.
Therefore, when the solenoid 31 is OFF (not energized), the operating element 30 is brought into a state in which the tip of the actuator 30 can be brought into contact with the peripheral surface of the ring portion 29b of the chipped gear 20 to be engaged with the engaging portion 25 or 26. When 31 is turned on (energized), the actuator 30 is attracted by the solenoid 31 and its tip is disengaged from the engaging portion 25 or 26. The coil spring 32 is omitted in the drawings other than FIG.

  The urging member 40 is constituted by a torsion spring, and the coil portion 41 is attached to a pin (not shown) of the frame. One end 42 of the urging member 40 is hooked to a hook portion (not shown) of the frame, and the other end 43 is integrally formed across the boss portion 29a and the ring portion 29b of the tooth missing gear 20. For example, when the tooth portions 21 and 22 of the chipped gear 20 are not meshed with the input gear 10 as shown in FIG. 2 (1), the chipped gear 20 is connected to the input gear 29c. 10 is urged in the direction of meshing with 10 (indicated by the arrow in FIG. 2 (1)).

The slider 50 constitutes a linear cam that displaces a load body 60 that applies the load F to the slider 50. Reference numeral 52 denotes an inclined surface constituting the cam portion, and 53 denotes a horizontal plane constituting the cam portion.
The slider 50 slides while being guided by a frame (not shown).
A contact portion 51 with the cam is provided at the end portion of the slider 50 on the toothless gear 20 side, and this contact portion 51 is provided with the engagement portion 25 of the toothless gear 20 and the like. It can come into contact with cam surfaces 27a and 27b of a cam 27 provided integrally on the surface opposite to the surface.

  For example, in the image forming apparatus in which the drive transmission mechanism 1 is incorporated, the load member 60 includes a shaft of a secondary transfer roller that contacts and separates from the intermediate transfer member, a shaft for raising and lowering a lift plate of the sheet feeding unit, and image formation. When the apparatus is a tandem machine, it can be composed of a shaft of a primary transfer roller that comes in contact with and separates from the photoreceptor via a sheet, and the like.

Hereinafter, the operation of the drive transmission mechanism 1 will be described with reference to FIGS. 2 and 3, but the initial state (standby state) will be described first.
(1) FIG. 2 (1) is a diagram showing a standby state (initial state).
As shown in FIG. 2 (1), in the standby state, the input gear 10 faces the tooth missing portion 23 of the tooth missing gear 20 and meshes with both the tooth portions 21 and 22 of the tooth missing gear 20. Absent.
The urging member 40 urges the toothless gear 20 in the rotational direction indicated by an arrow in FIG.
However, in this standby state, since the solenoid 31 is in the OFF state, the actuator 30 is engaged with the engaging portion 25 of the chipped gear 20 to prevent the chipped gear 20 from rotating.
Therefore, even if the input gear 10 rotates (or rotates), the power is not transmitted to the toothless gear 20.

(2) When the solenoid 31 is turned on from the state shown in FIG. 2A and the actuator 30 is attracted by the solenoid 31 to be disengaged from the engaging portion 25, the urging force of the urging member 40 causes the tooth missing. The gear 20 rotates in the direction of the arrow. At this time, the contact portion 51 is not in contact with any of the cam surfaces 27a and 27b. Until the tooth portion 21 of the toothless gear 20 meshes with the input gear 10, the contact portion 51 does not contact any of the cam surfaces 27a and 27b.
As shown in FIG. 2 (2), the toothless gear 20 is rotated in the direction of the arrow by the biasing force of the biasing member 40, and the tooth portion 21 meshes with the input gear 10. It will be transmitted to the gear 20.
Further, when the tooth portion 21 of the chipped gear 20 meshes with the input gear 10, the contact portion 51 of the slider 50 starts to contact with one cam surface 27a.

(3) As shown in FIG. 2 (3), after the engaging portion 25 of the chipped gear 20 passes through the tip of the actuator 30, before the next engaging portion 26 reaches the tip of the actuator 30, The solenoid 31 is turned OFF, so that the tip of the actuator 30 comes into contact with the peripheral surface of the boss portion 29b and can be engaged with the next engaging portion 26.
Further, as shown in the figure, as the toothless gear 20 continues to rotate, the contact portion 51 receives a force from the cam surface 27a, the slider 50 slides in the direction of the arrow X1, and the load body 60 It moves upward along the inclined surface 52.
The abutting portion 29 c abuts on the urging member 40 and bends the urging member 40.

(4) As shown in FIG. 3 (4), when the tooth missing portion 24 of the tooth missing gear 20 faces the input gear 10 (the tooth portion 21 does not mesh with the input gear 10), the input gear 10 The power to the tooth-missing gear 20 is cut off. At this time, the biasing member 40 biases the tooth-missing gear 20 in the arrow direction. When the engagement portion 26 of the chipped gear 20 is engaged with the actuator 30, the rotation of the chipped gear 20 is stopped.
In the process from the state shown in FIG. 2 (3) to the state shown in FIG. 3 (4), the slider 50 further slides in the direction of the arrow X 1, and the load body 60 goes up the inclined surface 52 of the slider 50 and reaches the horizontal plane 53. Abut.
At this time, the contact portion 51 is not in contact with any of the cam surfaces 27a and 27b.

(5) From the state shown in FIG. 3 (4), when the solenoid 31 is turned on again and the actuator 30 is attracted by the solenoid 31 and the engagement with the engaging portion 26 is released, the biasing member 40 is attached. The tooth-missing gear 20 is rotated again by the force, and the tooth portion 22 meshes with the input gear 10.
Therefore, the power of the input gear 10 is transmitted again to the toothless gear 20.
Further, when the tooth portion 22 of the toothless gear 20 meshes with the input gear 10, the contact portion 51 of the slider 50 starts to contact the other cam surface 29b (see FIG. 3 (5)).

(6) As shown in FIG. 3 (5), after the engaging portion 26 of the chipped gear 20 has passed the tip of the actuator 30, before the next engaging portion 25 reaches the tip of the actuator 30, The solenoid 31 is turned OFF, so that the tip of the actuator 30 comes into contact with the peripheral surface of the boss portion 29b and can be engaged with the next engaging portion 25.
Further, as shown in the figure, as the toothless gear 20 continues to rotate, the contact portion 51 receives a force from the cam surface 27b, the slider 50 slides in the direction of the arrow X2, and the load body 60 It moves down along the inclined surface 52.

(7) After that, as shown in FIG. 2 (1), when the tooth missing portion 23 of the tooth missing gear 20 faces the input gear 10 (the tooth portion 22 stops meshing with the input gear 10), the input is performed. The power from the gear 10 to the chipped gear 20 is cut off, but at this time, the biasing member 40 biases the chipped gear 20 in the direction of the arrow. Is rotated in the direction of the arrow, and the engagement portion 25 of the toothless gear 20 is engaged with the actuator 30, whereby the rotation of the toothless gear 20 is stopped.
As a result, the drive transmission mechanism 1 returns to the initial state, and the slider 50 reciprocates once for each rotation of the toothless gear 20 and the cylindrical cam 27, and the load body 60 reciprocates up and down once.

  The drive transmission mechanism 1 as described above includes an input gear 10 for inputting a driving force, two tooth portions 21 and 22 that mesh with the input gear 10, and two tooth missing portions 23 and 24 that do not mesh with the input gear 10. And a tooth-missing gear 20 that is driven to rotate when the tooth portions 21 and 22 mesh with the input gear 10, and an engagement portion 25 that is provided coaxially with the tooth-missing gear 20 and rotates together with the tooth-missing gear 20. , 26, and the engagement portions 25, 26 are engaged and disengaged, and when the engagement portions 25, 26 are engaged, the rotation of the toothless gear 20 is prevented, and when the engagement with the engagement portions 25, 26 is released, the teeth Actuator 30 that allows rotation of chipped gear 20, operating means 31 that engages and disengages this actuator 30 with engaging portions 25 and 26, and tooth portions 21 and 22 of said toothless gear 20 mesh with input gear 10. When there is no tooth missing gear 20 Is biased in a direction to mesh with the input gear 10, a cylindrical cam 27 that rotates together with the tooth-missing gear 20, and a direction orthogonal to the load vector F by the load body 60 and the axial direction of the tooth-missing gear 20. A slider 50 that slides in the same direction X1 and X2 and slides in conjunction with the cylindrical cam 27. The cam 27 has a tooth-missing gear by the biasing force of the biasing member 40. Since the shape is such that no force is applied to the slider 50 until the toothed portion of the toothless gear 20 meshes with the input gear 10, the drive transmission mechanism 1 has the following effects. Is obtained

That is, when the tooth missing gear 20 is stopped, the tooth missing gear 20 is not affected by the load vector F of the load body 60 at all. Moreover, the shape of the cylindrical cam 27 is such that a force is applied to the slider 50 until the toothless gear 20 is rotated by the biasing force of the biasing member 40 and the tooth portions 21 and 22 of the toothless gear 20 are engaged with the input gear 10. Since the actuator 30 is disengaged from the engaging portions 25 and 26 by the actuating means 31 and the toothless gear 20 is rotated by the biasing means 40 to mesh with the input gear 10, the toothless gear is formed. No load is applied to 20.
Therefore, according to this drive transmission mechanism 1, even if a large load F by the load body 60 is applied to the slider 50, a large biasing force is applied to the biasing member 40 for meshing the chipped gear 20 with the input gear 10. The biasing member 30 and the actuation means 31 are not required because a large force is not required for the actuation means 31 that removes the actuator 30 that engages and disengages from the engagement portions 25 and 26 from the engagement portions 25 and 26. Miniaturization can improve cost merit.
Further, by configuring the slider 50 with a linear motion cam or the like that displaces the load body 60 that applies the load F to the slider 50, the load body 60 with a large load F can be moved.
As described above, according to the drive transmission mechanism 1, it is possible to move the load body 60 on which the large load F acts while improving the cost merit (at least without reducing it).
The cylindrical cam 27 has a shape that returns the slider 50 to the original position (initial position) when the tooth-missing gear 20 makes one rotation. Therefore, the slider 50 is reciprocated in the axial direction of the tooth-missing gear 20. The load body 60 can be moved repeatedly.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the gist of the present invention.
For example, the gear is not limited to a spur gear, and can be a helical gear, or a step gear.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Embodiment of the drive transmission mechanism which concerns on this invention, (a) is a perspective view, (b) is a top view, (c) is a front view, (d) is a side view. (1)-(3) is operation | movement explanatory drawing. (4) and (5) are operation explanatory views.

Explanation of symbols

  1: drive transmission mechanism, 10: input gear, 20: tooth-missing gear, 21, 22 teeth, 23, 24: tooth-missing, 25, 26: engagement, 27: cylindrical cam, 30: actuator, 31 : Actuating means, 40: Biasing member, 50: Slider, 60: Load body, F: Load vector.

Claims (4)

An input gear for inputting driving force;
A tooth missing gear that has a tooth portion that meshes with the input gear and a tooth missing portion that does not mesh with the input gear, and the toothed portion meshes with the input gear,
An engagement portion provided coaxially with the chipped gear and rotating together with the chipped gear;
An actuator that engages with and disengages from the engaging portion, prevents rotation of the chipped gear when engaged with the engaging portion, and permits rotation of the chipped gear when disengaged from the engaging portion;
An operating means for engaging and disengaging the operating member with the engaging portion;
An urging member that urges the tooth-missing gear in a direction to mesh with the input gear when a tooth portion of the tooth-missing gear is not meshed with the input gear;
A cylindrical cam coaxial with the chipped gear and rotating with the chipped gear;
A slider that slides in a direction orthogonal to a load vector by a load body and in the same direction as the axial direction of the chipped gear, and slides in conjunction with the cylindrical cam;
The shape of the cylindrical cam is such that no force is applied to the slider until the chipped gear rotates by the biasing force of the biasing member and the toothed portion of the chipped gear meshes with the input gear. A drive transmission mechanism characterized by that.   The cylindrical cam has a shape that does not contact the slider until the chipped gear rotates by the biasing force of the biasing member and the toothed portion of the chipped gear meshes with the input gear. The drive transmission mechanism according to claim 1.   3. The drive transmission mechanism according to claim 1, wherein the cylindrical cam has a shape that returns the slider to its original position when the tooth-missing gear makes one rotation.   4. The drive transmission mechanism according to claim 1, wherein the slider constitutes a linear cam that displaces a load body that applies the load to the slider. 5.

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