JP2011021640A - Rotating direction reversing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure of a rotating direction reversing unit, and to provide stable reversing action. <P>SOLUTION: An intermediate shaft 7 extending in a direction orthogonal to a fixed shaft 1 is provided around the fixed shaft 1, bevel gears 8, 9 respectively rotatably attached with a first input member 2 and an output member 4 on both sides of the intermediate shaft 7 are provided on opposing faces of the first input member 2 and the output member 4, and an intermediate bevel gear 10 engaging with the bevel gears 8, 9 is rotatably attached to the intermediate shaft 7 as a second member 3. In a state of rotating the first input member 2, when a revolution speed (a rotation speed of the intermediate shaft 7) of the intermediate bevel gear 10 of the second input member 3 is changed to about half of a rotation speed of the first input member 2, a rotating direction of the output member 4 is reversed. By this, a conventional spring clutch can be eliminated, and simplification of the structure and stabilization of the reversing action can be carried out. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotation direction reversing unit for reversing the rotation direction of an output side member without changing the rotation direction of the input side member when transmitting the rotation of the input side member to the output side member.

  Many office machines such as copiers and printers have a duplex printing function added to save paper. In order to perform printing on both sides of the paper, a mechanism for switching the paper transport direction between forward and reverse is necessary. As such a mechanism, two drive sources are provided, and the first drive source is used when transporting the paper in the paper discharge direction. When the paper feed roller is rotated in the forward direction and the paper is conveyed in the reverse direction, the second drive source rotates the paper feed roller in the reverse direction (see, for example, Patent Document 1).

  In addition, the applicant of the present application has already proposed a rotating direction reversing unit that simplifies the structure of the mechanism described in Patent Document 1 and reduces the cost (Japanese Patent Application No. 2007-70032). In this reversing unit, the first input gear, the second input gear, and the output gear are arranged coaxially, and when a driving torque is input to the first input gear, the spring clutch provided on the first input gear is locked. As a result, the output gear rotates in the same direction as the first input gear to rotate the paper feed roller forward. At this time, the input torque of the second input gear is cut off by an electromagnetic clutch or the like and rotates together with the first input gear and the output gear. In this state, when a reverse driving torque is input by operating an electromagnetic clutch or the like with respect to the second input gear, the spring clutch of the first input gear is disconnected by the second input gear, and the output gear is input to the second input gear. The paper feed roller rotates in the same direction as the gear and reversely rotates the paper feed roller.

  By the way, the rotation direction reversing unit has a simple structure as compared with the mechanism of the above-mentioned Patent Document 1, but the first input gear is provided with a spring clutch and the second input gear is in operation during the operation of the first input gear. It is necessary to provide means such as an electromagnetic clutch for cutting off the input of the drive torque to the motor, and the number of parts such as these clutches is large, so that there is a problem that it takes a lot of time to assemble. In addition, since the mechanism uses a spring clutch, there is a problem that the operating torque increases due to the sliding torque of the clutch, troubles due to malfunction of the clutch operation, and abnormal noise during idling easily occur.

JP 2002-154727 A

  An object of the present invention is to simplify the structure of a rotation direction reversing unit and to obtain a stable reversing operation.

  In order to solve the above problems, the rotation direction reversing unit of the present invention rotates an intermediate shaft extending in a direction orthogonal to the fixed shaft, a first input member and an output member sandwiching the intermediate shaft around the fixed shaft, respectively. A bevel gear is provided on the opposing surface of the first input member and the output member, and a plurality of intermediate bevel gears meshing with the bevel gears of the first input member and the output member are rotatably attached to the intermediate shaft. When the rotation speed of the intermediate shaft of the second input member is changed to about 1/2 of the rotation speed of the first input member while the first input member is rotated with the object as the second input member Further, the rotation direction of the output member is reversed.

  Alternatively, an intermediate shaft extending in a direction orthogonal to the fixed shaft and a second input member and an output member sandwiching the intermediate shaft are rotatably attached around the fixed shaft, and the second input member and the output member are opposed to each other. A bevel gear is provided on the surface, and a plurality of intermediate bevel gears meshed with the bevel gears of the second input member and the output member are rotatably attached to the intermediate shaft as a first input member. When the rotational speed of the second input member is changed to about twice the rotational speed of the intermediate shaft of the first input member with the shaft rotated, the rotational direction of the output member is reversed. May be.

  In other words, the bevel gears of the first and second input members are combined with the bevel gear of the output member, and the rotation speed of the output member around the fixed axis is changed to reverse the rotation direction of the output member. As a result, the conventional spring clutch is not required, and the structure is simplified and the reversing operation is stabilized.

  In the above configuration, the first input member, the second input member, and the output member are each provided with a ring gear coaxial with the fixed shaft, and the first drive gear is provided on the ring gear of the first input member. The second drive gear may be meshed with the ring gear of the second input member, and the driven gear may be meshed with the ring gear of the output member.

  The present invention can be particularly effectively applied to a rotation direction reversing unit incorporated in an office machine such as a copying machine or a printer.

  As described above, the rotation direction reversing unit of the present invention can reverse the rotation direction of the output member without using a spring clutch by using a combination of bevel gears. Therefore, a conventional spring clutch is used. The structure is simpler than that of the product, and the number of parts is small. In addition, since the operating torque is small, there is no fear of problems such as troubles caused by clutch operation failure and abnormal noise during idling as in the prior art, and a stable reversing operation can be obtained over a long period of time.

Front sectional view of the rotation direction reversing unit of the first embodiment. a and b are explanatory diagrams of the operation of the reversing unit of FIG. Front sectional view of the rotation direction reversing unit of the second embodiment a and b are explanatory diagrams of the operation of the reversing unit in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment. The rotation direction reversing unit is incorporated in an office machine such as a copying machine or a printer. As shown in FIG. 1, the rotation direction reversing unit includes a fixed shaft 1, a first input member 2, a second input member 3 and the like. The output member 4 is basically configured. Each member 2, 3, 4 arranged around the fixed shaft 1 is prevented from coming off by retaining rings 5 fitted to both ends of the fixed shaft 1.

  The second input member 3 has a boss portion 6 that is rotatably fitted on the outer periphery of the fixed shaft 1, and an intermediate shaft 7 that extends in a direction perpendicular to the fixed shaft 1 at the center in the longitudinal direction of the boss portion 6. Are integrally formed. And the said 1st input member 2 and the output member 4 are attached to the outer periphery of the boss | hub part 6 so that rotation of the intermediate shaft 7 is possible.

  The first input member 2 and the output member 4 are provided with bevel gears 8 and 9 on opposite surfaces. On the other hand, an intermediate bevel gear 10 that meshes with the bevel gears 8 and 9 of the first input member 2 and the output member 4 is rotatably attached to the second input member 3 at positions sandwiching the fixed shaft 1 around the intermediate shaft 7. It has been. Each intermediate bevel gear 10 of the second input member 3 is fitted into a small diameter portion formed near both ends of the intermediate shaft 7, and a retaining ring 11 fitted into a large diameter portion of the intermediate shaft 7 and both ends of the intermediate shaft 7. It is positioned between.

  Further, the first input member 2 and the output member 4 are provided with ring gears 12 and 13 coaxial with the fixed shaft 1 at their outer peripheral portions. On the other hand, the second input member 3 has ring gears 14 coaxial with the fixed shaft 1 attached to both ends of the intermediate shaft 7. The first drive gear 15 is connected to the ring gear 12 of the first input member 2, the second drive gear 16 is connected to the ring gear 14 of the second input member 3, and the driven gear 17 is connected to the ring gear 13 of the output member 4. It comes to mesh. A drive source for the first input member 2 is connected to the first drive gear 15, and a drive source for the second input member 3 is connected to the second drive gear 16 (not shown).

  Next, the operation of this reversing unit will be described. First, as shown in FIG. 2A, when a driving torque is input to the first input member 2 via the first driving gear 15 and the second input member 3 is stopped, the first input member 2 With the rotation, the intermediate bevel gear 10 of the second input member 3 rotates around the intermediate shaft 7. The rotation of the intermediate bevel gear 10 around the intermediate shaft 7 is referred to as the rotation of the intermediate bevel gear 10. By the rotation of the intermediate bevel gear 10, the output member 4 rotates in the direction opposite to that of the first input member 2, and the paper feed roller (not shown) is rotated forward via the driven gear 17.

  2A, when a driving torque in the same direction as the first input member 2 is input to the second input member 3 via the second drive gear 16, the ring gear 14 of the second input member 3; The intermediate shaft 7 and the intermediate bevel gear 10 rotate around the fixed shaft 1 as a unit. The rotation of the intermediate bevel gear 10 around the fixed shaft 1 is referred to as revolution of the intermediate bevel gear 10.

  Here, when the revolution speed of the intermediate bevel gear 10 of the second input member 3 (the rotational speed of the intermediate shaft 7) is less than ½ of the rotational speed of the first input member 2, the state shown in FIG. In comparison, the rotation speed of the intermediate bevel gear 10 and the rotation speed of the output member 4 are reduced, but the rotation direction is not changed. However, when it becomes equal to 1/2 of the rotational speed of the first input member 2, the revolution speed and the rotational speed of the intermediate bevel gear 10 are balanced and the output member 4 stops. And as shown in FIG.2 (b), when the rotational speed of the 1st input member 2 exceeds 1/2, the revolution speed of the intermediate bevel gear 10 will exceed the autorotation speed, and the output member 4 will be FIG. The paper feed roller rotates in the opposite direction to the state of a) (the same direction as the first input member 2), and the paper feed roller is rotated in reverse via the driven gear 17. If the revolution speed of the intermediate bevel gear 10 is further increased, the rotation of the intermediate bevel gear 10 stops when the rotational speed of the first input member 2 becomes equal to the rotational speed of the first input member 2. If the upper limit is exceeded, the intermediate bevel gear 10 rotates in the direction opposite to the state shown in FIG. At this time, the rotation direction of the output member 4 remains the reverse of that in FIG.

  That is, in this reversing unit, the revolution speed of the intermediate bevel gear 10 of the second input member 3 is changed to about 1/2 of the rotational speed of the first input member 2 while the first input member 2 is rotated. Thereby, the rotation direction of the output member 4 can be reversed.

  This reversing unit has the above-described configuration and operation, and does not use a spring clutch to reverse the rotation direction of the output member 4, so that the reversing operation is simpler and more stable than the conventional one. It is done.

  3 and 4 show a second embodiment. In this embodiment, as shown in FIG. 3, the second input member 3 of the first embodiment is used as the first input member 18, the ring gear 14 is meshed with the first drive gear 15, and the second input member The first input member 2 of the first embodiment is used as 19, and the ring gear 12 is meshed with the second drive gear 16. The configuration of the other parts is the same as that of the first embodiment.

  The operation of this rotation direction reversing unit is as follows. First, as shown in FIG. 4A, when the second input member 19 is stopped and a drive torque is input to the first input member 18 via the first drive gear 15, the rotation direction is opposite to that of the first embodiment. Direction), the intermediate bevel gear 10 rotates while revolving with the rotation of the intermediate shaft 7, whereby the output member 4 rotates in the same direction as the first input member 18, and the paper feed roller via the driven gear 17. (Not shown) is rotated forward.

  4A, when a driving torque in the same direction as the first input member 18 is input to the second input member 19 via the second drive gear 16, the rotation speed of the second input member 19 is determined. Thus, the rotation operation of the intermediate bevel gear 10 of the first input member 18 changes.

  At this time, if the rotation speed of the second input member 19 is less than the revolution speed of the intermediate bevel gear 10 of the first input member 18 (the rotation speed of the intermediate shaft 7), only the rotation speed of the intermediate bevel gear 10 changes, and the intermediate bevel gear 10 changes. When the revolution speed of the gear 10 becomes equal, the rotation of the intermediate bevel gear 10 stops, and when the revolution speed of the intermediate bevel gear 10 is exceeded, the intermediate bevel gear 10 rotates in the direction opposite to the state shown in FIG. . During this time, the output member 4 remains rotating in the same rotational direction as in FIG. When the rotation speed of the second input member 19 is further increased and becomes equal to twice the revolution speed of the intermediate bevel gear 10, the revolution speed and the rotation speed of the intermediate bevel gear 10 are balanced, and the output member 4 is stopped. When the revolution speed of the intermediate bevel gear 10 exceeds twice the revolution speed, as shown in FIG. 4B, the rotation speed of the intermediate bevel gear 10 exceeds the revolution speed, so that the output member 4 is in the state shown in FIG. The paper feed roller rotates in the reverse direction (the same direction as the first input member 18) and the driven gear 17 rotates in reverse.

  That is, in this reversing unit, by rotating the intermediate bevel gear 10 of the first input member 18, the rotational speed of the second input member 19 is changed to around twice the revolution speed of the intermediate bevel gear 10. The rotation direction of the output member 4 can be reversed.

  Therefore, in this embodiment as well as the first embodiment, a reversing operation with a simple structure and a stable structure can be obtained as compared with the conventional one using a spring clutch.

DESCRIPTION OF SYMBOLS 1 Fixed shaft 2 1st input member 3 2nd input member 4 Output member 6 Boss part 7 Intermediate shaft 8, 9 Bevel gear 10 Intermediate bevel gears 12, 13, 14 Ring gear 15 First drive gear 16 Second drive gear 17 Covered Drive gear 18 First input member 19 Second input member

Claims (4)

An intermediate shaft extending in a direction orthogonal to the fixed shaft, and a first input member and an output member sandwiching the intermediate shaft are rotatably attached around the fixed shaft, and the first input member and the output member are opposed to each other. Bevel gears,
A plurality of intermediate bevel gears that mesh with the bevel gears of the first input member and the output member are rotatably attached to the intermediate shaft as a second input member,
When the rotational speed of the intermediate shaft of the second input member is changed to about 1/2 of the rotational speed of the first input member with the first input member rotated, the rotational direction of the output member Rotation direction reversing unit designed to reverse. An intermediate shaft extending in a direction orthogonal to the fixed shaft, and a second input member and an output member sandwiching the intermediate shaft are rotatably attached around the fixed shaft, and are mounted on opposing surfaces of the second input member and the output member. Bevel gears,
A plurality of intermediate bevel gears that mesh with the bevel gears of the second input member and the output member are rotatably attached to the intermediate shaft as a first input member,
When the rotation speed of the second input member is changed to about twice the rotation speed of the intermediate shaft of the first input member while the intermediate shaft of the first input member is rotated, Rotation direction reversing unit that reverses the rotation direction. The first input member, the second input member and the output member are each provided with a ring gear coaxial with the fixed shaft,
The first drive gear is engaged with the ring gear of the first input member, the second drive gear is engaged with the ring gear of the second input member, and the driven gear is engaged with the ring gear of the output member. The rotation direction reversing unit according to claim 1 or 2.   4. The rotating direction reversing unit according to claim 1, wherein the rotating direction reversing unit is incorporated in an office machine such as a copying machine or a printer.

Images