JP2000195140A - Inversion mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inversion mechanism which does not impart the impact force generated by contact of brake pieces and a stopper to a driving power transmission system and an electric motor. SOLUTION: This mechanism is constituted to have a easing 1 of a picker unit which is rotatably supported and holds a cartridge, the electric motor 6 which rotates this casing 1, a pair of the brake pieces 2 and 2 which are arranged at the casing 1 on the same rotating circumference of its revolving shaft 3, a stopper 4a which is detained to the respective brake pieces 2 in order to limit the rotation of the casing 1 to an angle range arranged with the brake pieces 2 and 27, and a pulley unit 5 which is disposed on a route for transmitting the rotating force of the electric motor 6 to the casing 1 and limits the transmission of the rotating force when the rotating force exceeds the prescribed magnitude.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic changer which stores a plurality of cartridges each containing a magneto-optical disk capable of using both sides thereof and sequentially reads and writes the magneto-optical disks. To a reversing mechanism for reversing.

[0002]

2. Description of the Related Art For example, an autochanger for a magneto-optical disk has a storage shelf provided with a plurality of storage chambers for storing a magneto-optical disk together with its cartridge inside a housing, and a data storage for the magneto-optical disk in the cartridge. A drive device for reading and writing, a picker unit for loading / unloading the cartridge into / from the storage room and the drive device, and moving the picker unit to a position facing the storage room and the loading / unloading port of the drive device; A drive control unit for performing operations such as reversing the cartridge for reading and writing on the side surface, and storing a large number of magneto-optical disks together with the cartridges in the storage chamber in advance, so that one drive Even if only a device is provided, multiple magneto-optical disks can be It is capable of sequentially reading and writing with respect to the magneto-optical disk. Further, when a plurality of drive devices are provided, it is possible to simultaneously read / write from / to a plurality of magneto-optical disks.

[0003] In such an autochanger,
Optical disks, magnetic disks,
And various types of recording media such as magnetic tapes.

The picker unit is arranged such that the side facing the storage chamber is rearward, and a picker unit is provided in a box-shaped housing having a rear side surface missing so as to be able to advance and retreat in a direction in which the opening is opened. The picker portion has a hook portion at the rear portion for engaging with the cartridge.

The drive control unit moves the picker unit to a position where the opening faces the loading / unloading port of the storage room or the drive device, moves the picker unit backward, and moves the tip end of the picker unit into the storage room or the drive device. Push and operate the hook to engage the cartridge. Then, by moving the picker portion forward in this engaged state, the cartridge is taken into the housing. Move the picker unit to a position where the opening faces the loading / unloading port of another storage room or drive device, for example, and move the picker unit backward,
While the cartridge is pushed into the storage chamber or the drive device, the hooker is disengaged from the cartridge, and then the picker is moved forward to return to the original state. .

Further, as described above, the drive control section may move the picker unit in a state where the cartridge to be carried into the storage chamber or the drive device is inverted, or move the picker unit in the inverted state. A reversing mechanism is provided for reversing the picker unit before moving the picker unit to take in the cartridge carried into the drive device.

In this reversing mechanism, the casing of the picker unit is rotatably supported around an axis protruding forward from the center of the front surface thereof, and a pulley provided at the tip of the rotating shaft is connected via a belt. It is connected to an electric motor, and has a configuration in which a pair of brake pieces are provided at the rotation positions of the housing facing each other about the rotation axis, and a stopper that locks the brake pieces is provided. It should be noted that there is also a reversing mechanism configured to connect the electric motor and the rotating shaft via another power transmission system such as a gear train instead of the pulley and the belt.

With this configuration, the rotation force of the electric motor is transmitted to the rotation of the rotation shaft via a power transmission system such as a belt and a pulley, and the housing is rotated together with the rotation shaft. This rotation is limited from the rotational position where one brake piece abuts the stopper to 180 ° where the other brake piece abuts the stopper.
It is possible to reverse in both forward and reverse directions by 80 °.

The reversing operation is performed at a relatively high speed by the electric motor, so that the pair of brake pieces and the stopper receive a large impact force. For this reason, these braking pieces and stoppers are made of stainless steel to increase rigidity and wear resistance.

[0010]

However, in the above-described conventional reversing mechanism, a large impact force is applied to the electric motor via the power transmission system at the time of each reversing operation by the pair of braking members and the stopper having high rigidity. It has been reported that a large back electromotive force is generated in the electric motor due to the impact force, which causes a problem.

Further, in the case of a configuration using a gear train for the power transmission system, for example, there is a problem that the power transmission system may be broken, for example, the gear teeth may be lost.

[0012] The present invention has been made in view of such circumstances, and the rotational force of an actuator such as an electric motor is reduced.
For example, when the rotational force exceeds a predetermined magnitude on a path for transmitting to the cartridge holding means such as a picker unit or a picker unit for holding the cartridge, by providing a restricting means for restricting the transmission of the rotational force. ,
An object of the present invention is to provide a reversing mechanism that does not apply an impact force generated by the contact between the braking piece and the stopper to a power transmission system and an electric motor.

[0013]

A reversing mechanism according to the first invention is rotatably supported and has holding means for holding an object;
An actuator for rotating the holding unit, a pair of braking units disposed on the same rotation circumference of the rotation axis of the holding unit, and an angle range in which the pair of braking units are arranged to rotate the holding unit. In a reversing mechanism having a locking portion for locking to each braking portion so as to limit the rotation force on a path for transmitting the torque of the actuator to the holding means, when the torque exceeds a predetermined magnitude. And limiting means for restricting the transmission of the rotational force.

A reversing mechanism according to a second invention is characterized in that, in the reversing mechanism of the first invention, the limiting means is a torque limiter.

According to a third aspect of the present invention, there is provided a reversing mechanism which is rotatably supported and holds holding means for holding an object, an actuator for rotating the holding means, and the holding means having a rotation axis on the same rotation circumference as a rotation axis thereof. A reversing mechanism, comprising: a pair of disposed braking portions; and a locking portion that locks to each of the braking portions so as to limit rotation of the holding unit to an angle range in which the pair of braking portions are disposed. A pulley that is rotationally driven through a belt, a shaft body with a flange that supports the pulley movably in the axial direction, a spring that urges the pulley and the flange in a direction to press the flange in the axial direction, Adjusting means for adjusting the biasing force of the spring, wherein the rotation of the pulley is transmitted to the holding means via the shaft body by a frictional force between the pulley and the flange. To.

A reversing mechanism according to a fourth invention is the reversing mechanism according to the third invention, characterized in that a first friction body is interposed between the pulley and the flange.

A reversing mechanism according to a fifth aspect of the present invention is the reversing mechanism of the fourth aspect, wherein the pulley is provided on the side opposite to the side on which the flange is provided with respect to the pulley so as to be movable in the axial direction. A second friction member, wherein the spring is provided with the first friction member.
And the second friction member is urged to sandwich the pulley, and the frictional force of the first and second friction members transmits the rotation of the pulley to the holding means via the shaft. There is a feature.

According to the reversing mechanism according to the present invention, an object such as a recording medium or a cartridge containing the recording medium, which is rotatably supported, is held by a holding means such as a picker unit or a picker unit having the same. While the holding means is rotated by the actuator, the holding means is provided with a pair of braking portions on the same rotation circumference of its rotation axis, and the rotation of the holding means is limited to an angular range in which the pair of braking portions are provided. In a reversing mechanism in which the locking portion is locked to each braking portion, when the rotation force exceeds a predetermined magnitude on a path for transmitting the rotation force of the actuator to the holding device, the limiting device controls the rotation force of the actuator. Since the transmission is restricted, for example, the impact force generated by the contact between the braking piece and the stopper of the conventional configuration described above cannot be released and applied to the power transmission system and the electric motor. .

Further, according to another reversing mechanism according to the present invention, since a torque limiter is used as the limiting means, the impact force can be suppressed with a simple configuration.

The limiting means may be a torque limiter using a fluid or a torque limiter using a fluid, in addition to the torque limiter using a sliding motion.

According to another reversing mechanism according to the present invention, a pulley driven by an actuator with a belt is provided;
A shaft body with a flange that supports the pulley movably in the axial direction, a spring that urges the pulley and the flange in a direction in which the pulley and the flange are pressed in the axial direction, and adjustment means that adjusts the urging force of the spring; Since the rotation of the pulley is transmitted to the holding means via the shaft body by the frictional force between the pulley and the flange, the power conversion mechanism for transmitting the rotational force of the actuator to the holding means by belt drive as described above. Such limiting means can be incorporated with a simple configuration.

Further, since the first friction member is interposed between the pulley and the flange, the rotational torque of the actuator can be efficiently transmitted by using, for example, a felt brake pad. ,
It becomes easy to adjust the sliding rotation with respect to the impact torque as described above.

Further, a second friction body is provided on the side opposite to the side on which the flange is provided with respect to the pulley so as to be movable in the axial direction so that the pulley is sandwiched between the first and second friction bodies. Since the rotation of the pulley is transmitted to the holding means via the shaft body by the frictional force generated by these frictional bodies by being urged by the spring, an even greater frictional force can be obtained.

The present invention can be used particularly as a reversing mechanism for a recording medium of an autochanger as described above. However, the present invention is not limited to the autochanger, and may be used, for example, in a recording medium manufacturing apparatus capable of using both sides. It is also possible to apply the present invention to the transport mechanism. Also,
It is needless to say that the reversing mechanism of the present invention can be used even when the recording medium is housed in the cartridge as described above and the recording medium is reversed for each cartridge.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a top view showing a main part of the reversing mechanism according to the present invention, and FIG. 2 is a front view thereof.

In FIGS. 1 and 2, reference numeral 1 denotes a box-shaped casing of a picker unit arranged in the same direction as shown, and only the rear portion is shown. A substantially box-shaped base 1a is fixed to the housing 1 from the front center portion to the upper portion thereof. A pair of braking pieces 2 and 2 each formed of an angle member are fixed to the base 1a at one flange portion in the same direction, and the other flange portion is oriented in the thickness direction in the front-rear direction. The end portions on the side sides are respectively arranged so as to protrude in the left-right direction. Further, the braking pieces 2, 2 have their lower ends at the same height position in the left-right direction, and are disposed above the center position on the front surface of the housing 1.

At a position corresponding to the center of the housing 1 of the base 1a, there is provided a rotating shaft 3 which is fixedly protruding forward. An intermediate portion of the rotating shaft 3 is supported by a frame 4 fixed to a drive control unit of an autochanger (not shown). 1 and 2, the frame 4 is provided with a stopper 4a at a position in contact with the lower end of the braking piece 2 located on the right side. The stopper 4a
It is made of a plate-like member, and its upper end is in contact with the braking piece 2, and the casing 1, the base 1 a, and the braking piece 2
2 rotates 180 ° counterclockwise in FIG.
At its lower end, it comes into contact with the other braking piece 2.

A pulley unit 5 having a torque limiter, which will be described later, is attached to the front end of the rotating shaft 3. A belt 7 is hung on a pulley 54 provided in the pulley unit 5, and the belt 7 is It is connected to a pulley 61 of an output shaft 6a of the electric motor 6 provided in the drive control unit.

FIG. 3 is an exploded perspective view showing the structure of the pulley unit 5 and shows a state viewed from above the front side in FIGS. Pulley unit 5 is large and small
An intermediate shaft 50 having a step diameter, a stepped shaft shape, and a flange 503 provided at an end on the large diameter portion 501 side is provided. A fitting hole 504 is formed on an end surface of the intermediate shaft 50 on the side of the large diameter portion 501 so as to fit to the tip of the rotating shaft 3. Two screw holes 50 drilled in the large diameter portion 501 of the shaft 50 in the radial direction
The mounting screws 51, 51 are respectively screwed from 5,505 to fix the intermediate shaft 50 to the rotating shaft 3.

An annular brake plate 52a is fitted over the large-diameter portion 501 of the intermediate shaft 50, abuts against the front surface of the flange 503, and is fixed using a double-sided adhesive tape. An annular felt-made brake pad 53a is fixed to the front surface of the brake plate 52a using a double-sided adhesive tape. Further, the pulley 54 described above is fitted outside the brake pad 53a from the remaining portion of the large diameter portion 501 of the intermediate shaft 50 to a part of the small diameter portion 502. The pulley 54 is provided so as to freely rotate on the intermediate shaft 50 with some friction.

In front of the pulley 54, a brake pad 53b and a brake plate 52b similar to those described above are externally fitted to the small diameter portion 502 of the intermediate shaft 50 in this order, and the brake plate 52b is
The rotation of the intermediate shaft 50 is restricted by the small-diameter portion 502 having a flat cross section. Further, a coil spring 55 is externally fitted to the small-diameter portion 502 of the intermediate shaft 50 projecting forward of the brake plate 52b, and a disk-shaped spring retainer 56 is disposed in front of the coil spring 55. Spring retainer 56
The adjustment screw 57 is inserted from the front surface into a hole formed at the center of the screw hole 506 formed at the end face of the small-diameter portion 502 via a coil spring 55. Is screwed into.

By increasing or decreasing the tightening of the adjusting screw 57, the distance between the end surface of the small diameter portion 502 and the rear surface of the spring retainer 56 is reduced or increased, and the length of the coil spring 55 regulated by the distance is reduced. By decreasing or increasing, the urging force of the coil spring 55 against the spring plate 56 against the brake plate 52b is increased or decreased.

The pulley unit 5 is configured as described above. Since the brake plates 52a and 52b and the brake pads 53a and 53b are fixed to the intermediate shaft 50 fixed to the rotary shaft 3 in the rotation direction, the brake plate 52a , 52b
And the pulley 54 sandwiched between the brake pads 53a and 53b receives a frictional force between them, which increases or decreases in accordance with an increase or decrease in the urging force of the coil spring 55. At the same time as a torque limiter.

For example, by rotating the electric motor 6 in the counterclockwise direction in FIG. 2 from the state shown in FIGS.
The housing 1 rotates in the same direction via the pulley unit 5.
The housing 1 is stopped by the braking piece 2 on the left side in FIG. 2 abutting on the lower end of the stopper 4a, but the housing 1 attempts to rotate clockwise by the impact force at the time of abutting. The impact torque transmitted to the rotating shaft 3 due to this causes each part on the side of the pulley unit 5 on which rotation is regulated by the intermediate shaft 50 to
It acts to rotate in the opposite direction to the pulley 54 driven by the belt 7. Thereby, the pulley 54
Is rotated while sliding with the brake pads 53a, 53b on both surfaces thereof, and absorbs the impact torque instead of frictional heat. Therefore, the torque limit of the pulley 54 due to the tightening of the adjusting screw 57 is set to be slightly larger than the initial motion torque required for rotating the housing 1 so that the pulley 54 slides with respect to an impact torque sufficiently larger than this. It is determined appropriately within the following range.

[0035]

As described above in detail, in the reversing mechanism according to the present invention, a holding means such as a picker unit or a picker unit provided with the rotatably supported object such as a recording medium or a cartridge containing the same is provided. And the holding means is rotated by the actuator, while the holding means is provided with a pair of braking portions on the same rotation circumference of the rotation shaft, and the rotation of the holding means is provided with a pair of braking portions. In a reversing mechanism in which the locking portion is locked to each braking portion so as to limit the angle range, when the rotation force exceeds a predetermined magnitude on a path for transmitting the rotation force of the actuator to the holding means, the rotation is limited. The means restricts the transmission of the rotational force, thereby releasing the impact force generated by, for example, the abutting of the braking piece and the stopper of the conventional configuration described above, and applying the impact force to the power transmission system and the electric motor. Rukoto is not.

Further, by using a torque limiter as the limiting means, the impact force can be suppressed with a simple configuration.

A pulley driven by an actuator with a belt, a shaft body with a flange for supporting the pulley movably in the axial direction, and a spring for urging the pulley and the flange in a direction for pressing the pulley and the flange in the axial direction. Adjusting means for adjusting the biasing force of the spring, and transmitting the rotation of the pulley to the holding means via a shaft by frictional force between the pulley and the flange, thereby holding the rotational force of the actuator by belt driving. The limiting means as described above can be incorporated into the power conversion mechanism for transmitting to the means with a simple configuration.

Further, by interposing the first friction member between the pulley and the flange described above, for example, by using a felt brake pad, the rotational torque of the actuator can be efficiently transmitted. It becomes easy to adjust the sliding rotation with respect to such an impact torque.

Further, a second friction member is provided on the opposite side of the pulley from the side where the flange is provided so as to be movable in the axial direction, and the pulley is sandwiched between the first and second friction members. By urging with a spring and transmitting the rotation of the pulley to the holding means via the shaft by the frictional force generated by these frictional bodies, it is possible to obtain a larger frictional force, etc.
The present invention has excellent effects.

[Brief description of the drawings]

FIG. 1 is a top view showing a main part of a reversing mechanism according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is an exploded perspective view showing a configuration of a pulley unit.

[Explanation of symbols]

 Reference Signs List 1 housing (of picker unit) 2 brake piece 3 rotating shaft 4a stopper 5 pulley unit 6 electric motor 52a, 52b brake plate 53a, 53b brake pad 54 pulley 55 coil spring 57 adjustment screw

Claims (5)

[Claims] 1. A holding means rotatably supported for holding an object, an actuator for rotating the holding means,
The holding means includes a pair of braking portions disposed on the same rotation circumference of the rotation axis thereof, and a plurality of braking portions for restricting rotation of the holding device to an angle range in which the pair of braking portions are disposed. A reversing mechanism having a locking portion for stopping, when the rotational force exceeds a predetermined magnitude on a path for transmitting the rotational force of the actuator to the holding means,
A reversing mechanism, wherein a restricting means for restricting transmission of the rotational force is provided. 2. The reversing mechanism according to claim 1, wherein said limiting means is a torque limiter. 3. A holding means rotatably supported and holding an object, an actuator for rotating the holding means,
The holding means includes a pair of braking portions disposed on the same rotation circumference of the rotation axis thereof, and a plurality of braking portions for restricting rotation of the holding device to an angle range in which the pair of braking portions are disposed. A reversing mechanism having a locking portion for stopping, a pulley rotatably driven via a belt by the actuator, a shaft body with a flange for movably supporting the pulley in an axial direction, the pulley and the flange A spring for biasing the pulley in the axial direction, and adjusting means for adjusting the biasing force of the spring. The frictional force between the pulley and the flange causes the pulley to rotate through the shaft body. A reversing mechanism, wherein the reversing mechanism is adapted to transmit to the holding means. 4. The reversing mechanism according to claim 3, wherein a first friction body is interposed between the pulley and the flange. 5. A pulley further comprising a second friction body provided on the pulley on a side opposite to a side on which the flange is provided, the second friction body being movably provided in the axial direction. The pulley is urged between the second friction bodies to transmit the rotation of the pulley to the holding means via the shaft body by the frictional force of the first and second friction bodies. The reversing mechanism according to claim 4.