JP2008008444A - Reversing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reversing mechanism which can output the rotation in both directions with a simple structure having a few components. <P>SOLUTION: Planetary bevel gears 4 to be engaged with the bevel gears 1a, 2a arranged on an input member 1 and an output member 2 opposed to each other are supported by an orthogonally crossing shaft member 5 capable of swiveling about the coaxially fixed rod 3 of the input member 1 and the output member 2. An intermediate shaft 6 is connected to the orthogonally crossing shaft member 5 so as to be fitted in the output member 2 and on the fixed rod 3. A first clutch 7a is provided so as to engage and disengage the output member 2 and the intermediate shaft 6, and a second clutch 7b is provided so as to engage and disengage the intermediate shaft 6 and the fixed rod 3. When the first clutch 7a has been engaged and the second clutch 7b has been disengaged, the output member 2 is normally turned in the same direction as the input member 1. When the first clutch 7a has been disengaged and the second clutch 7b has been engaged, the output member 2 is turned in the reversed direction. As a result, the rotational output in both of the normal direction and the reversed direction can be achieved with the simple structure having a few components. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a reverse rotation mechanism that can output rotation of an input member in both forward and reverse directions.

  For example, in a copying machine or printer in which many rotating rollers are incorporated, it is required to rotate some rollers in both forward and reverse directions with a compact design in order to perform duplex printing. Such reverse rotation mechanisms capable of rotating output in both forward and reverse directions include a combination of spur gears and a combination of bevel gears. A combination of spur gears includes an input shaft and an output shaft. Since it is necessary to arrange them in parallel at intervals, a compact design is not possible. In addition, a general reversing mechanism combined with a bevel gear needs to be arranged with the input shaft and the output shaft at right angles, so that it cannot be compactly designed.

  On the other hand, there is one in which an input member and an output member are arranged on the same axis, and the output member is rotated in both forward and reverse directions by a combination of bevel gears (see, for example, Patent Document 1). In the steering gear box described in Patent Document 1, a first boss (intermediate member) externally fitted to the input shaft is rotatably disposed between the input shaft (input member) and the output shaft (output member). The bevel gear with the shaft fixed to the bevel gear provided to face the input shaft and the first boss is meshed, and the first boss is rotated in the reverse direction and fixed to the input shaft penetrating the first boss. The second boss is rotated forward, the sleeve connecting the first boss or the second boss and the output shaft is shifted in the axial direction, and the output shaft is adjusted by switching the connection with each boss by shifting the sleeve. A reverse mechanism that rotates in both reverse directions is adopted. The shift position of the sleeve can also be selected in a state where the output shaft is freely rotated without connecting both bosses to the output shaft.

JP-A-4-39126

  In the reverse rotation mechanism described in Patent Document 1, the input member and the output member are coaxially arranged, but an intermediate member dedicated for reverse rotation is externally fitted to the input member between the input member and the output member. Therefore, there is a problem that the number of parts increases and the structure becomes complicated for the arrangement and support of the intermediate member.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a reverse rotation mechanism capable of rotating output in both forward and reverse directions with a simple structure with a small number of parts.

  In order to solve the above-described problem, the reverse rotation mechanism of the present invention has an input member to which rotation is input and an output member arranged so as to rotate around a coaxial fixed shaft, The output member is provided with a bevel gear opposed to each other, and at least one planetary bevel gear is meshed with these opposed bevel gears, and the planetary bevel gear is provided on an orthogonal shaft member that can turn around the fixed shaft. An orthogonal shaft portion orthogonal to the fixed shaft is rotatably supported, and a rotatable intermediate shaft fitted into the output member and externally fitted to the fixed shaft is connected to the orthogonal shaft member. And a first clutch means for turning on and off the connection between the output member and a second clutch means for turning on and off the connection between the intermediate shaft and the fixed shaft. When the clutch means is disengaged, the output member is Is rotated forward to a member in the same direction, the first clutch means switching, when the second clutch means is the input and adopts the structure to reverse the output member to the input member and the opposite direction.

  That is, a planetary bevel gear that meshes with a bevel gear of an input member and an output member that are opposed to each other is supported on an orthogonal shaft portion of an orthogonal shaft member that can be rotated about a fixed axis that is coaxial with the input member and the output member, and this orthogonal shaft member A first clutch means for connecting a rotatable intermediate shaft that is internally fitted to the output member and externally fitted to the fixed shaft, and for connecting and disconnecting the intermediate shaft and the output member; The planetary bevel gear supported by the orthogonal shaft member when the first clutch means is engaged and the second clutch means is disengaged by providing the second clutch means for turning on and off the connection with the shaft. When the first clutch means is disengaged and the second clutch means is engaged, the output member is revolved around the fixed shaft integrally with the input member and the output member, and the output member is normally rotated in the same direction as the input member. Is a straight shaft of an orthogonal shaft member that can stop turning by stopping the rotation of the intermediate shaft. Around the shank by rotating the planetary bevel gears, so as to reverse the output member to the input member and the opposite direction, and as the rotation output of the forward and reverse directions are obtained number of components in a few simple structure.

  When both the first and second clutch means are disconnected, rotation can be prevented from being transmitted to the output member. That is, when both the first and second clutch means are turned off, the orthogonal shaft member turns and the planetary bevel gear rotates around the orthogonal shaft portion of the orthogonal shaft member. Since the rotation torque is generally smaller than the load torque, rotation is not transmitted to the output member.

  The first clutch means is provided in the output member and the intermediate shaft adjacent to each other in the axial direction and provided with equal diameter portions having the same outer diameter, and the outer diameters of the equal diameter portions of the output member and the intermediate shaft. Connecting the output member and the intermediate shaft with a coil spring that is tightly fitted across the surface, providing a collar that locks one end of the coil spring on the outer diameter side of the coil spring, and providing means for stopping the rotation of the collar, When the rotation of the collar is stopped, the diameter of the interference-fitted coil spring is expanded, and the connection between the output member and the intermediate shaft is disconnected, so that the first clutch can be configured with a simple and compact configuration. Means can be turned on and off.

  The second clutch means is provided in the intermediate shaft and the fixed shaft adjacent to each other in the axial direction and provided with equal diameter portions having the same outer diameter, and the outer diameters of the equal diameter portions of the intermediate shaft and the fixed shaft. Connecting the intermediate shaft and the fixed shaft with a coil spring that is tightly fitted across the surface, providing a collar that locks one end of the coil spring on the outer diameter side of the coil spring, and providing means for stopping the rotation of the collar, When the rotation of the collar is stopped, the interference-fitted coil spring is expanded in diameter so that the intermediate shaft and the fixed shaft are disconnected, thereby enabling the second clutch to have a simple and compact configuration. Means can be turned on and off.

  The reversing mechanism of the present invention supports a planetary bevel gear that meshes with a bevel gear of an input member and an output member that are opposed to each other on an orthogonal shaft portion of an orthogonal shaft member that can turn around a fixed axis that is coaxial with the input member and the output member. A first clutch means for connecting a rotatable intermediate shaft fitted to the output member and fitted to the fixed shaft to the orthogonal shaft member, and for turning on and off the connection between the intermediate shaft and the output member; By providing the second clutch means for turning on and off the connection between the intermediate shaft and the fixed shaft, when the first clutch means is turned on and the second clutch means is turned off, the second shaft is supported by the orthogonal shaft member. The planetary bevel gear is rotated around the fixed shaft integrally with the input member and the output member, the output member is rotated forward in the same direction as the input member, the first clutch means is turned off, and the second clutch means is turned on. When it is turned on, the rotation can be stopped by stopping the rotation of the intermediate shaft. By rotating the planetary bevel gear around the orthogonal shaft of the member and reversing the output member in the opposite direction to the input member, it is possible to obtain rotational output in both forward and reverse directions with a simple structure with a small number of parts. it can.

  When both the first and second clutch means are turned off, the rotation can be prevented from being transmitted to the output member.

  The first clutch means includes an output member and an intermediate shaft, which are adjacent to each other in the axial direction and provided with equal-diameter portions having the same outer diameter dimension. The output member and the intermediate shaft are connected by a coil spring that is passed and tightly fitted, and a collar that locks one end of the coil spring is provided on the outer diameter side of the coil spring, and means for stopping the rotation of the collar is provided. When the rotation is stopped, the diameter of the interference-fitted coil spring is expanded and the connection between the output member and the intermediate shaft is cut off, so that the first clutch means is turned on and off with a simple and compact configuration. be able to.

  The second clutch means includes an intermediate shaft and a fixed shaft, which are adjacent to each other in the axial direction and provided with an equal diameter portion having the same outer diameter dimension. The intermediate shaft and the fixed shaft are connected by a coil spring that is inserted and tightened, and a collar is provided on the outer diameter side of the coil spring to lock one end of the coil spring, and means for stopping the rotation of the collar is provided. When the rotation is stopped, the diameter of the interference-fitted coil spring is expanded and the connection between the intermediate shaft and the fixed shaft is cut off, so that the second clutch means is turned on and off with a simple and compact configuration. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the reversing mechanism is arranged so that the input member 1 and the output member 2 rotate around a coaxial fixed shaft 3. Two planetary bevel gears 4 are meshed with bevel gears 1 a and 2 a provided so as to face each other, and each planetary bevel gear 4 is rotatable on an orthogonal shaft portion 5 a of an orthogonal shaft member 5 orthogonal to the fixed shaft 3. It is supported. An input spur gear 1 b and an output spur gear 2 b are provided on the outer diameter surfaces of the input member 1 and the output member 2, respectively, and forward rotation is input from the drive gear 21 to the input member 1. Further, the driven gears 22a and 22b are meshed with the spur gears 1b and 2b, the forward rotation is output to the driven gear 22a, and the forward and reverse rotations are output to the driven gear 22b as will be described later. It is like that.

  At the center of the orthogonal shaft member 5, a cylindrical portion 5b that is pivotally fitted to the fixed shaft 3 is provided, and an intermediate shaft 6 whose tip is connected to the end surface of the cylindrical portion 5b by fitting of an uneven portion. Is rotatably fitted on the fixed shaft 3 and is fitted on the output member 2. The rear end side of the intermediate shaft 6 penetrates to the back side of the output member 2, and a later-described first clutch 7a is configured on the back side of the output member 2 and the rear end side of the penetrated intermediate shaft 6. The same-diameter portions 2c and 6c that are adjacent to each other in the axial direction and have the same outer diameter are provided. Further, the rear end side of the fixed shaft 3 penetrates the rear end side of the intermediate shaft 6, and the rear end side of the fixed shaft 3 penetrates the rear end side of the intermediate shaft 6 so as to constitute a second clutch 7b described later. An equal-diameter portion 3c that is adjacent to the diameter portion 6c in the axial direction and has the same outer diameter is provided.

  The outer diameter surface of the output member 2 and the intermediate diameter portion 2c, 6c of the intermediate shaft 6 constituting the first clutch 7a, the equal diameter portion 6c of the intermediate shaft 6 and the fixed shaft 3 constituting the second clutch 7b, Coil springs 8a and 8b connecting the output member 2 and the intermediate shaft 6 and the intermediate shaft 6 and the fixed shaft 3 are respectively passed and tightly fitted on the outer diameter surface of the coil 3c, and the outer diameters of the coil springs 8a and 8b are respectively fitted. On the side, collars 9a and 9b are provided for receiving the coil springs 8a and 8b and locking one end thereof.

  Further, ratchets 10a and 10b are formed on the outer diameter surfaces of the collars 9a and 9b. The outer sides of these collars 9a and 9b advance and retract in the radial direction by turning on and off the solenoids 11a and 11b, respectively. Claws 12a and 12b are provided to prevent rotation of 10b. When the claws 12a and 12b are advanced to prevent the ratchets 10a and 10b from rotating, coil springs 8a and 8b whose ends are locked to the collars 9a and 9b are provided. The diameter is increased, and the connection between the output member 2 and the intermediate shaft 6 and the connection between the intermediate shaft 6 and the fixed shaft 3 by the respective interference fits are cut off.

  The operation of the reverse rotation mechanism described above will be described below. As shown in FIG. 3, the pawl 12a of the first clutch 7a is retracted to connect the output member 2 and the intermediate shaft 6, and the pawl 12b of the second clutch 7b is advanced to prevent the ratchet 10b from rotating. When the connection between the intermediate shaft 6 and the fixed shaft 3 is cut, the output member 2 and the intermediate shaft 6 rotate together, and the orthogonal shaft member 5 connected to the intermediate shaft 6 also turns together. Therefore, the planetary bevel gear 4 attached to the orthogonal shaft member 5 revolves around the fixed shaft 3 without rotating, and the input member 1 meshed with the planetary bevel gear 4 by the bevel gear 1a is also the output member 2 and the orthogonal shaft member 5. , And a positive rotation is output to the output member 2.

  As shown in FIG. 4, the pawl 12a of the first clutch 7a is advanced to prevent the ratchet 10a from rotating, the output member 2 and the intermediate shaft 6 are disconnected, and the pawl 12b of the second clutch 7b is moved backward. When the intermediate shaft 6 and the fixed shaft 3 are connected, the rotation of the intermediate shaft 6 is stopped, and the rotation of the orthogonal shaft member 5 connected to the intermediate shaft 6 is also stopped. Therefore, in this case, the planetary bevel gear 4 rotates around the orthogonal shaft portion 5a of the orthogonal shaft member 5, and reverse rotation is output to the output member 2 by the rotation of the planetary bevel gear 4.

  Further, as shown in FIG. 5, the claws 12a and 12b of the first and second clutches 7a and 7b are moved forward to prevent the ratchets 10a and 10b from rotating, and the output member 2, the intermediate shaft 6, and the intermediate When both the shaft 6 and the fixed shaft 3 are disconnected, the orthogonal shaft member 5 turns as the input member 1 rotates, and the planetary bevel gear 4 moves around the orthogonal shaft portion 5 a of the orthogonal shaft member 5. Although it rotates, since these turning torque and rotation torque are generally smaller than load torque, rotation is not transmitted to the output member 2.

  In each of the embodiments described above, the number of planetary bevel gears attached to the orthogonal shaft member is two, but the number of planetary bevel gears can also be one, and the shaft portion of the orthogonal shaft member is formed in a radial shape such as a cross. It is also possible to install three or more planetary bevel gears.

A longitudinal sectional view showing an embodiment of a reverse rotation mechanism 1 is an exploded perspective view of the rotation transmission mechanism of FIG. 1 is a longitudinal sectional view showing a state in which a normal rotation is output by the reverse rotation mechanism of FIG. 1 is a longitudinal sectional view showing a state in which reverse rotation is output by the reverse rotation mechanism of FIG. 1 is a longitudinal sectional view showing a state where rotation is not transmitted to the output member by the reverse rotation mechanism of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input member 2 Output member 1a, 2a Bevel gear 1b, 2b Spur gear 2c Equal-diameter part 3 Fixed shaft 3c Equal-diameter part 4 Planetary bevel gear 5 Orthogonal shaft member 5a Orthogonal shaft part 5b Cylindrical part 6 Intermediate shaft 6c Equal-diameter part 7a 7b Clutch 8a, 8b Coil spring 9a, 9b Collar 10a, 10b Ratchet 11a, 11b Solenoid 12a, 12b Claw

Claims (4)

  An input member to which rotation is input and an output member are disposed so as to rotate around a coaxial fixed shaft, and bevel gears that are opposed to each other are provided on the input member and the output member. At least one planetary bevel gear is meshed with the bevel gear, and the planetary bevel gear is rotatably supported on an orthogonal shaft portion orthogonal to a fixed shaft provided on an orthogonal shaft member that can be rotated around the fixed shaft, A first clutch means for connecting a rotatable intermediate shaft fitted to the output member and fitted to the fixed shaft to the orthogonal shaft member, and for connecting or disconnecting the output member and the intermediate shaft. And a second clutch means for turning on and off the connection between the intermediate shaft and the fixed shaft, and when the first clutch means is turned on and the second clutch means is turned off, the output member is input to the input member. When rotating forward in the same direction as the member, the first clutch means is disengaged, When the clutch means is the input and reversal mechanism the output member so as to reverse the input member and the opposite direction.   The reverse rotation mechanism according to claim 1, wherein rotation is not transmitted to the output member when both the first and second clutch means are disengaged.   The first clutch means is provided in the output member and the intermediate shaft adjacent to each other in the axial direction and provided with equal diameter portions having the same outer diameter, and the outer diameters of the equal diameter portions of the output member and the intermediate shaft. Connecting the output member and the intermediate shaft with a coil spring that is tightly fitted across the surface, providing a collar that locks one end of the coil spring on the outer diameter side of the coil spring, and providing means for stopping the rotation of the collar, 3. The reverse rotation mechanism according to claim 1, wherein when the rotation of the collar is stopped, a diameter of the interference-fitted coil spring is expanded to disconnect the output member from the intermediate shaft. 4.   The second clutch means is provided in the intermediate shaft and the fixed shaft adjacent to each other in the axial direction and provided with equal diameter portions having the same outer diameter, and the outer diameters of the equal diameter portions of the intermediate shaft and the fixed shaft. Connecting the intermediate shaft and the fixed shaft with a coil spring that is tightly fitted across the surface, providing a collar that locks one end of the coil spring on the outer diameter side of the coil spring, and providing means for stopping the rotation of the collar, 4. The reverse rotation mechanism according to claim 1, wherein when the rotation of the collar is stopped, the coil spring that has been tightly fitted expands in diameter, and the connection between the intermediate shaft and the fixed shaft is disconnected. .

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