JP2002372121A - Cam device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cam device which is capable of ensuring the ecology for the device constitution with a cam as a main body, transmitting the high rotational torque, being miniaturized, realizing the high-speed operation, and preferably applicable as a base machine for various kinds of machine devices such as an APC device for handling a heavy article. SOLUTION: This cam device comprises a main input shaft 4 having a roller gear cam 14 and rotated, a sub input shaft 5 which is provided side by side to the main input shaft, and synchronously rotated with the main input shaft by the rotation of the main input shaft transmitted thereto, four plate cams 17 and 18 provided respectively on the main input shaft and the sub input shaft, a lift plate 20 with the lift motion output from these plate cams input therein, a turret 15 with the rotational motion output from the roller gear cam input therein, and an output shaft 6 with the rotational motion and the lift motion respectively input from the turret and the lift plate, and the turret for inputting the rotational motion in the output shaft is integrated with the output shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cam-based device which is eco-friendly and at the same time is compact while being capable of transmitting high rotational torque.
A that can realize high-speed operation and handle heavy objects
The present invention relates to a cam device that can be preferably applied as a base machine of various mechanical devices such as a PC device.

[0002]

2. Description of the Related Art In a conventional automatic pallet changing device (APC device) applied to various machine tools, a pallet and a work mounted thereon have a considerable weight. While a hydraulic device is used for the lifting operation to raise and lower, a worm gear mechanism is used for the rotating operation for rotating the pallet, and the hydraulic device and the worm gear mechanism obtain a large output necessary for handling heavy objects. .

On the other hand, a pick-and-place device and an automatic tool changer (ATC device) for a lightweight work are known as devices that output the same motion as an APC device. These pick-and-place devices and the like are mainly configured with cams.Specifically, a rotation conversion cam such as a roller gear cam is provided on the input shaft, and a groove cam is formed integrally with the rotation conversion cam or A lift cam is provided by separately attaching a plate cam to the input shaft.The rotation output of the rotation conversion cam is input to the output shaft via a turret, and the lift output of the lift cam is output via a lever. Input to the output shaft to cause the output shaft to perform a lift operation and a rotation operation.

[0004] In particular, the turret and the output shaft are spline-coupled in order to allow a lift operation of the output shaft while ensuring rotation transmission between the two, so that the output shaft is rotated by the turret. The lever is lifted by the lever without interfering therewith (see Japanese Utility Model Laid-Open No. 63-121852).

[0005]

The conventional AP
The C device has a problem that the working environment is deteriorated because the hydraulic device uses oil. That is, in addition to the complicated maintenance work of the hydraulic device,
It is necessary to provide a facility for treating leaked or scattered oil as a factory facility, and appropriate measures are required when disposing of oil after use. As described above, there are various problems in the conventional APC device equipped with the hydraulic device, and the use of such a hydraulic device as an ecological technology contributing to environmental improvement, in combination with social demands for current environmental problems. It is desired to develop a device without any.

Further, in the conventional APC device, it is difficult to accurately synchronize the lift operation by the hydraulic devices having different drive modes and the rotation operation by the worm gear mechanism.
Therefore, at the time of switching from the lift operation to the rotation operation and from the rotation operation to the lift operation, it is necessary to temporarily stop both the hydraulic device and the worm gear mechanism.

A conventional APC combining such a hydraulic device with a worm gear mechanism in order to employ such a hydraulic device and to output a lift operation and a rotation operation.
In order to solve the problem of the device, it is conceivable to divert the configuration of the above-described conventional pick-and-place device mainly using a cam as it is. In this case, the input shaft, output shaft, arm,
It is necessary to increase the size of components such as the turret.

In particular, in a pick-and-place apparatus, the required rotating torque may be small because the object is a lightweight work. Therefore, the transmission of the rotating torque is performed by a spline connection between the output shaft and the turret in consideration of the lift operation. I have. However, it is difficult to transmit the high-torque rotation necessary for handling heavy objects with the spline connection, and when the spline connection is applied as it is, the turret and the output shaft need to be considerably enlarged, and this requires There is a problem that the device becomes extremely large due to this. As described above, when the size of the APC device itself is increased, there is a problem that the foundation of the factory equipment on which the APC device is to be installed needs to be made robust, and that a drive source having a large output is required.

Although the above problem has been described by taking the APC apparatus as an example, it is a common problem in a large-sized mechanical device which outputs a movement of both a lift operation and a rotation operation to handle a heavy object.

Therefore, the present invention has been made in view of such a conventional problem, and while ensuring an ecological configuration as a device mainly composed of a cam, it is possible to transmit a high rotational torque while being small in size. Another object of the present invention is to provide a cam device that can realize high-speed operation and can be preferably applied as a base machine of various mechanical devices such as an APC device that handles heavy objects.

[0011]

In order to achieve the above object, a cam device according to the present invention comprises: an input main shaft having a rotation converting cam and driven to rotate; The rotation of the input main shaft is transmitted via a transmission means, and the input sub shaft is rotated synchronously with the input main shaft; at least two main shaft side lift generating cams provided on the input main shaft; At least two countershaft-side lift generating cams provided; a lift plate to which lift motions output from the at least four countershaft-side lift generation cams and the main shaft-side lift generation cams are input and lifted; A turret to which the rotational motion output from the rotation conversion cam is input and rotated, and a rotational motion and a lift motion respectively input from the turret and the lift plate. With an output shaft which is rotated operation and lifted Te, the output shaft, the turret for inputting a rotational motion thereto, characterized in that it is formed integrally.

Further, the output shaft including the turret is formed in a hollow cylindrical shape, and a guide body for guiding a rotation operation and a lift operation is inserted into the output shaft.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a cam device according to the present invention will be described in detail with reference to the accompanying drawings. In the embodiment shown in FIGS. 1 to 6, the case where the cam device is applied to the APC device 1 is shown. An input main shaft 4 is provided on a housing 3 having a housing shape having the mounting legs 2.
The input main shaft 4 and the input sub-shaft 5 are arranged in parallel in a horizontal direction and at a distance from each other, and a rotational operation and a lift operation are performed between the input main shaft 4 and the input sub-shaft 5 in a vertical direction intersecting them. An output shaft 6 is provided.

The input main shaft 4 is rotatably supported by the housing 3 at both ends via bearing members 7, and is continuously rotated in one direction by a rotation driving source (not shown). The input countershaft 5 is formed to have the same diameter as the input main shaft 4, and both ends thereof are rotatably supported by the housing 3 via bearing members 8. Between the input sub-shaft 5 and the input main shaft 4, the rotation of the input main shaft 4 is transmitted to the input sub-shaft 5 to rotate the input sub-shaft 5 synchronously with the input main shaft 4, ie, at least in one direction at the same rotational speed. Transmission means 9 for continuous rotation
Is provided.

In the illustrated example, the rotation transmitting means 9
A drive gear 10 provided on the input main shaft 4 and integrally rotated therewith, a first idle gear 11 rotatably supported by the housing 3 and meshed with the drive gear 10, and a first idle gear 11 rotatably supported by the housing 3 A second idle gear 12 meshed with the first idle gear 11 and a driven gear 13 provided on the input countershaft 5 and meshed with the second idle gear 12 to rotate the input countershaft 5; And the driven gear 13 are the same, the first and second idle gears 1
The same shafts 1 and 12 are used so that the input main shaft 4 and the input sub shaft 5 can be rotated in the opposite directions at the same rotational speed. Even if the input main shaft 4 and the input sub shaft 5 have different diameters, it is a matter of course that both can be synchronously rotated by appropriately setting the gear ratio of the rotation transmitting means 9.

The input spindle 4 has a cam for rotation conversion,
A roller gear cam 14 is provided that generates an intermittent rotational motion that repeats rotation and stop from one-way continuous rotation of the input spindle 4. The roller gear cam 14 is a cam follower 1 for rotation transmission of a turret 15 described later provided on the output shaft 6.
6 is releasably engaged with the turret 15 and outputs an intermittent rotation according to the cam profile to the turret 15 via the rotation transmitting cam follower 16.

The input main shaft 4 is provided with at least two plate cams 17 for generating a lift motion from one-way continuous rotation of the input main shaft 4 on both sides of the roller gear cam 14 as main shaft side lift generating cams. . These plate cams 17 are provided with the same cam profile and the same phase around the input main shaft 4. In the present embodiment, these plate cams 17 are formed integrally with the roller gear cam 14 by processing both side surfaces of the roller gear cam 14. The plate cam 17 may be attached to the input main shaft 4 separately from the roller gear cam 14 if necessary.

Also on the input countershaft 5, plate cams 18 for generating a lift motion from one-way continuous rotation of the input countershaft 5 are opposed to the plate cams 17 on the input main shaft side. At least two.
The plate cams 18 are provided with a cam profile obtained by inverting the plate cam 17 on the input main shaft side because the input sub shaft 5 rotates in the reverse direction with respect to the input main shaft 4, and are provided with the same phase around the input sub shaft 5. During one rotation of the main shaft 4 and the input counter shaft 5, all the plate cams 17, 18 generate an equal lift movement.

When the rotation directions of the input main shaft 4 and the input sub shaft 5 are the same, all the plate cams 17 and 18 are provided with the same cam profile and the same phase. Even if the input main shaft 4 and the input sub-shaft 5 have different diameters, by setting the cam profiles of the plate cams 17 and 18 of the input main shaft 4 and the input sub-shaft 5 as appropriate, all the plate cams 17 and 18 can be formed. Of course, equal lift movements can be generated. The plate cam 17 on the input main shaft side and the roller gear cam 14 are provided on the same input main shaft 4, and the plate cam 18 on the input sub shaft side rotates the input sub shaft 5 synchronously with the input main shaft 4 so that these lifts The timing of the movement and the rotation movement are completely synchronized.

On the other hand, the output shaft 6 is formed in the shape of a hollow cylinder, and is provided by being inserted into a solid cylindrical guide body 19 erected from the bottom of the housing 3. The entire output shaft 6 is rotatably and vertically slidably supported by the housing 3 via the guide member 19, and the guide member 19 guides the rotation operation and the lift operation.

The output shaft 6 is provided with a lift plate 20 located at a substantially intermediate portion in the axial direction. The lift plate 20 has an outer dimension in which the width between the input main shaft and the input sub shaft does not interfere with the roller gear cam 14, and has an arm portion 21 extending directly above the plate cams 17 and 18 at four corners thereof. A lift cam follower 2 that is formed and engages with each of the plate cams 17 and 18 that generates an equal lift movement
2 are provided. Thus, the lift motion according to the cam profiles of the plate cams 17 and 18 is input to the lift plate 20 via the lift cam follower 22, and the lift plate 20 is lifted while keeping the horizontal state. Is input to the output shaft 6, and the output shaft 6 is stably lifted in the upward direction without tilting.

A ring-shaped member 23 is provided at the upper end of the output shaft 6 so as to cover the output shaft 6.
Plate 20 formed around the lower end of the shaft and output shaft 6
In order to allow the output shaft 6 to rotate relative to the lift plate 20 while supporting the thrust generated between the lift plate 20 and the output shaft 6 during the transmission of the lift motion, A bearing 25 is provided. The ring-shaped member 23 at the upper end of the output shaft 6 includes
A pallet 26 on which the work W is mounted is attached by bolts, and the upper end 27 of the guide body 19 is stabilized in order to stabilize the turning movement and the lifting movement of the pallet 26.
Penetrates the ring-shaped member 23 and is engaged with a hole 28 formed at the center of rotation of the pallet 26 so as to be rotatable and relatively movable up and down.

The output shaft 6 is provided with a turret 15 having a rotation transmitting cam follower 16 which engages with the roller gear cam 14 below the lift plate 20. The rotation transmitting cam followers 16 are provided at equal intervals along the circumferential direction of the turret 15. This allows the turret 15 to input the intermittent rotational motion output by the roller gear cam 14 to the output shaft 6.

In particular, the turret 15 is formed integrally with the output shaft 6 as a part of the output shaft 6 without performing any joining to the output shaft 6, so that the output shaft 6 and the turret 15 It is a functional part built into one part, and is in a form in which the material of the part itself is joined with high rigidity. In addition, the housing 3 is provided with a seal member 29 that seals a penetrating portion of the output shaft 6.

FIGS. 5 and 6 show timing lines of the intermittent rotational movement and the lift movement output from the roller gear cam 14 and the plate cams 17 and 18 respectively driven by the input main shaft 4 continuously driven in one direction. The figure and the operating state of the APC apparatus 1 according to the figure are shown.

While the input main shaft 4 makes one 360 ° rotation, the output shaft 6 is guided by the plate cams 17 and 18 via the lift plate 20 and guided by the guide body 19 to perform a lift operation ((a)-( b)) is that the roller gear cam 14 is
The turret 15 is in a rotation stopped state during a dwell period in which no rotational displacement is output even if the input main shaft 4 rotates, and then, when the output shaft 6 completes the lifting operation and stops, the turret 15 transmits the roller gear cam through the turret 15. The output shaft 6 is rotated by 180 ° while being guided by the guide body 19 (14 (b)-(c)).
When the rotation operation up to ° is completed and the roller gear cam 14 enters the dwell period and the turret 15 stops rotating, the lowering operation is performed while the output shaft 6 is guided by the guide body 19 by the plate cams 17 and 18 ((c)). -(d)), and such an operation is repeated for each rotation of the input spindle 4. During the period from the completion of the downward lift operation to the start of the next upward lift operation, the stop state for a short period is set by setting the cam profiles of the plate cams 17 and 18.
(d) is to be created.

Therefore, the pallet 26 attached to the output shaft 6 rises, turns by 180 ° and descends at the first rotation of the input main shaft 4, then rises again at the second rotation, and rotates by 180 ° in the same direction. The operation of turning and descending, which is completed in two rotations, is continuously performed. During this time, the input main shaft 4 and the input sub shaft 5 for lifting and rotating the output shaft 6
Is continuously rotated at a constant speed without being decelerated or stopped.

In this series of operations, the turret 15 formed integrally with the output shaft 6 is lifted up and down together with the output shaft 6, that is, according to the cam profiles of the roller gear cam 14 and the plate cams 17 and 18, (At this time, the cam profile of the roller gear cam 14 is straight in the vertical direction in which the rotation transmitting cam follower 16 engaging with the roller gear cam 14 is not displaced). Then, the cam follower 16 for rotation transmission is engaged with the roller gear cam 14 and the subsequent roller gear cam 1
4 is input to the turret 15,
During the subsequent dwell period of the roller gear cam 14, the output shaft 6
Cam follower 1 for lowering lift
6 is detached from the roller gear cam 14.

Incidentally, the degree of separation of the rotation transmitting cam follower 16 from the roller gear cam 14 can be adjusted in relation to the lift amount, and it is possible to set the engagement so as not to be completely disengaged, or You may set so that it may completely deviate. When it is set to be completely disengaged, it is desirable to provide a detent or the like for preventing rotation of the turret 15 or the output shaft 6 in order to surely restore the engagement.

In the cam apparatus according to this embodiment described above, the lift plate 20 is lifted by the at least four plate cams 17 and 18 provided on the input main shaft 4 and the input sub shaft 5 which are rotated in synchronization with each other. Since the input shaft is operated to lift the output shaft 6, the plate cams 17 and 18 share the load of a heavy load while the output shaft 6 is lifted.
Can be stably lifted directly upward without tilting, and the movement stability of the output shaft 6 to which a heavy load is applied can be improved.

Further, since the turret 15 is formed integrally with the output shaft 6, considerable rigidity can be secured without increasing the size of these portions to which the lift motion and the rotational motion are input. A high rotation torque can be input to the turret 15 while assuring a lift operation and a rotation operation comparable to those of the related art, and a heavy object can be appropriately handled while maintaining a compact device configuration.

Further, the cams 14 and 1 without the hydraulic device are provided.
Since the apparatus is mainly composed of the devices 7 and 18, maintenance is easy and it is possible to contribute to ecology. Further, the plate cam 17 on the input main shaft side and the roller gear cam 14 are provided on the same input main shaft 4, and the plate cam 18 on the input sub shaft side rotates the input sub shaft 5 synchronously with the input main shaft 4. The timing of the lift motion and the rotation motion can be completely synchronized, and the operation speed of the device can be increased.

Further, the output shaft 6 integrally provided with the turret 15 is formed in a hollow cylindrical shape, and its rotation operation and lift operation are guided by the guide body 19 inserted into the output shaft 6. The guide body 19 can appropriately guide the motion while supporting the load applied to the output shaft 6 that handles heavy objects, and can improve the motion stability of the output shaft 6. Further, since the guide body 19 provided on the housing 3 is engaged with the pallet 26,
The turning of the pallet 26 and the movement stability of the lift can be improved.

In the above embodiment, the plate cams 17 and 18 have been described as examples of the cams for generating lifts. However, groove cams may be employed instead. In the above-described embodiment, the case where the cam device according to the present invention is applied to the APC device 1 has been described as an example. However, the present invention is not limited to this. Of course, it can be applied to various large-sized mechanical devices that handle.

[0035]

In summary, in the cam device according to the present invention, the ecological structure can be ensured by the device mainly composed of the cam, and the transmission of high rotational torque can be achieved by integrally forming the turret on the output shaft. Although it is possible to achieve the miniaturization of the device, it is possible to output the lift motion and the rotational motion from the rotation of the input main shaft, thereby realizing high-speed operation, and furthermore, to realize the load by at least four lift generating cams. It is possible to appropriately support a heavy load by sharing a load, and it can be preferably applied as a base machine of various mechanical devices such as an APC device that handles a heavy load.

Further, the guide body can appropriately guide the movement of the output shaft for handling a heavy object, thereby improving the movement stability.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a preferred embodiment when a cam device according to the present invention is applied to an APC device.

FIG. 2 is a plan sectional view of the APC device of FIG. 1;

FIG. 3 is an external perspective view of the APC device of FIG.

FIG. 4 is a partially enlarged side sectional view showing a lowering lift state of an output shaft of the APC device of FIG. 1;

FIG. 5 is a timing diagram of a roller gear cam and a plate cam applied to the APC apparatus of FIG. 1;

FIG. 6 is an explanatory diagram for explaining an operation of the APC device of FIG. 1;

[Explanation of symbols]

 Reference Signs List 4 Input main shaft 5 Input sub shaft 6 Output shaft 9 Rotation transmission means 14 Roller gear cam 15 Turret 17 Input main shaft side plate cam 18 Input sub shaft side plate cam 19 Guide body 20 Lift plate

Claims (2)

[Claims] An input main shaft having a rotation converting cam and being driven to rotate, and provided in parallel with the input main shaft, the rotation of the input main shaft is transmitted via rotation transmitting means, and the input main shaft is rotated synchronously with the input main shaft. An input sub shaft, at least two main shaft side lift generation cams provided on the input main shaft, at least two sub shaft side lift generation cams provided on the input sub shaft, and at least four sub shafts A lift plate to which the lift motion output from the side lift generation cam and the spindle side lift generation cam is input and lifted; and a turret to which the rotary motion output from the rotation conversion cam is input and rotated. An output shaft to which a rotational motion and a lift motion are inputted from the turret and the lift plate, respectively, and a rotational motion and a lift motion are provided. Is a cam device wherein the turret for inputting rotational motion is formed integrally therewith. 2. The output shaft including the turret is formed in a hollow cylindrical shape, and a guide body for guiding a rotation operation and a lift operation is inserted into the output shaft. 2. The cam device according to claim 1.