JP6763601B2 - Intermittent indexing device - Google Patents

Description

The present invention relates to an intermittent indexing device.

In the cam-type intermittent indexing device, the driving state and the stopped state are alternately repeated during operation, so that the torque acting on the output shaft of the indexing device constantly fluctuates, while the reaction force of the torque is indexed as torque fluctuation. It acts on the input shaft of the device. The torque fluctuation acting on the input shaft hinders the uniform rotation of the input shaft, which causes strong mechanical vibration in the indexing device. For this reason, it is necessary to keep the torque fluctuation as small as possible, especially in an indexing device or the like that needs to be operated at a high speed.

Japanese Patent No. 3799123 Japanese Patent No. 40844777

In the above-mentioned prior art document, a torque compensating device including a torque compensating cam is disclosed as a means for suppressing a torque fluctuation acting on an input shaft. However, although these torque compensators cancel out the torque fluctuation acting on the input shaft, the balance with the torque fluctuation acting on the output shaft is not considered. That is, in the above-mentioned prior art document, there was no idea of compensating for the torque fluctuation acting on the output shaft. Further, when a specific indexing device, for example, a heavy product is placed on a table connected to the output shaft, the influence of vibration due to torque fluctuation acting on the output shaft may not be negligible.

The present invention provides a torque compensator that reduces torque fluctuations in both the input shaft and output shaft of the intermittent indexing device with a single mechanism and suppresses the effects of vibration on the intermittent indexing device due to torque fluctuations. An object of the present invention is to provide an intermittent indexing device provided.

The main invention for achieving the above object is an intermittent indexing device that converts a continuous rotational movement of an input shaft into an intermittent rotational movement of an output shaft, and a cam provided on the input shaft and the output shaft. A cam device having a cam follower fixed to the cam and engaging with the cam, a torque compensation cam provided on the input shaft, a torque compensation cam follower engaged with the torque compensation cam, and a torque compensation cam follower connected to the torque compensation cam follower. The torque-compensated rotating body is provided with a torque compensating device for reducing torque fluctuations acting on the input shaft, and the rotating shaft of the torque-compensated rotating body is on the same axis as the output shaft. The intermittent indexing device is arranged so as to be such that the direction of rotation acting on the output shaft and the direction of rotation of the torque compensation rotating body are the same.

Other features of the present invention will be clarified by the description of the description and drawings described later.

According to the present invention, it is possible to reduce the torque fluctuation of both the input shaft and the output shaft of the intermittent indexing device with one mechanism.

FIG. 1 is a schematic explanatory view of the intermittent indexing device 1A of the first embodiment. FIG. 2 is a cross-sectional view of the intermittent indexing device 1A of the first embodiment. FIG. 3 is a diagram showing an overlapping state of the indexing cam 10 and an overlapping state of the indexing cam follower 11. FIG. 4 is a cam curve diagram showing the operation of the indexing cam device 9A. FIG. 5 is a diagram showing an overlapping state of the torque compensation cam 13 and an overlapping state of the torque compensation cam follower 14. FIG. 6 is a cam curve diagram showing the operation of the torque compensating device 12A. FIG. 7 is a diagram showing a temporal change of the input system torque vibration. FIG. 8 is a diagram showing a temporal change of the output system torque vibration. FIG. 9 is a schematic explanatory view of the intermittent indexing device 1B according to the modified example of the first embodiment. FIG. 10 is a detailed explanatory view of the intermittent indexing device 1B according to the modified example of the first embodiment. FIG. 11 is a top view (partial sectional view) of the intermittent indexing device 1C of the second embodiment. FIG. 12 is a side view (partial sectional view) of the intermittent indexing device 1C of the second embodiment. FIG. 13 is a diagram showing a portion of the indexing cam device 9B of the intermittent indexing device 1C of the second embodiment.

=== Outline of disclosure ===
At least the following matters will be clarified from the description of the specification and drawings described later.

An intermittent indexing device that converts the continuous rotational motion of the input shaft into intermittent rotational motion of the output shaft, and is a cam follower fixed to the output shaft and engaged with the cam. A cam device having the above, a torque compensation cam provided on the input shaft, a torque compensation cam follower engaged with the torque compensation cam, and a torque compensation rotating body provided so as to be connected to the torque compensation cam follower. The torque compensating rotating body is arranged so as to rotate on the same axis as the output shaft, and is provided with a torque compensating device for reducing the torque fluctuation acting on the input shaft. The intermittent indexing device, characterized in that the direction of rotation is the same as the direction of rotation of the torque compensation rotating body, becomes clear. According to such an intermittent indexing device, it is possible to reduce torque fluctuations of both the input shaft and the output shaft of the intermittent indexing device with one mechanism.

The cam device has a stationary period in which the output shaft does not rotate even if the cam rotates, and a non-retained period in which the output shaft rotates with the rotation of the cam, and the torque compensation rotating body is arranged at regular intervals. It is provided so as to perform a rotational motion that alternately repeats acceleration and deceleration of the rotational speed each time, maintains the maximum rotational speed during the dwelling period, and is smaller than the dwelling period during the non-dwelling period. It is desirable to become. As a result, it is possible to reduce the torque fluctuation of both the input shaft and the output shaft of the intermittent indexing device with one mechanism.

It is desirable that the torque-compensated rotating body reaches the minimum rotational speed at a predetermined timing of the non-stationary period. As a result, it is possible to reduce the torque fluctuation of both the input shaft and the output shaft of the intermittent indexing device with one mechanism.

An indexing table fixed to the output shaft and on which an intermittent indexing motion acts is further provided, and the center of gravity position of the indexing table and the center of gravity position of the torque compensating rotating body are defined on the line of the output shaft. It is desirable that it is on the same side as the cam follower. Thereby, it is possible to reduce the disturbance due to the moment load.

It is desirable that the cam and the torque compensation cam are parallel cams. As a result, it is possible to efficiently reduce the torque fluctuations of both the input shaft and the output shaft of the intermittent indexing device with one mechanism.

It is desirable that the cam and the torque compensation cam are roller gear cams. As a result, it is possible to efficiently reduce the torque fluctuations of both the input shaft and the output shaft of the intermittent indexing device with one mechanism.

A torque compensator that reduces torque fluctuations acting on the input shaft in an intermittent indexing device that converts the continuous rotational movement of the input shaft into intermittent rotational movement of the output shaft, and is a torque provided on the input shaft. A compensation cam, a torque compensation cam follower engaged with the torque compensation cam, and a torque compensation rotating body provided so as to be connected to the torque compensation cam follower are provided, and the torque compensation rotating body has the same axis as the output shaft. A torque compensating device that is arranged to rotate on the top and is characterized in that the direction of rotation acting on the output shaft and the direction of rotation with the torque compensating rotating body are the same. According to such a torque compensator, it is possible to reduce the torque fluctuation of both the input shaft and the output shaft of the intermittent indexing device with one mechanism.

A torque compensation method for reducing torque fluctuations acting on the input shaft in an intermittent indexing device that converts continuous rotational movement of the input shaft into intermittent rotational movement of the output shaft, and is a torque provided on the input shaft. A compensation cam, a torque compensation cam follower that engages with the torque compensation cam, and a torque compensation rotating body provided so as to be connected to the torque compensation cam follower are provided, and the torque compensation rotating body has the same axis as the output shaft. Above, the torque compensation method characterized by rotating in the same direction as the direction of rotation acting on the output shaft becomes clear. According to such a torque compensator, it is possible to reduce torque fluctuations of both the input shaft and the output shaft of the intermittent indexing device with one mechanism.

=== 1st Embodiment ===
FIG. 1 is a schematic explanatory view of the intermittent indexing device 1A of the first embodiment. FIG. 2 is a cross-sectional view of the intermittent indexing device 1A of the first embodiment. First, the basic configuration of the intermittent indexing device 1A shown in FIG. 1 will be described, and then the detailed configuration and operation of the cam mechanism 8 of the intermittent indexing device 1A shown in FIG. 2 will be described.

In the following description of the first embodiment, each direction is defined as shown in FIGS. 1 and 2. That is, the direction parallel to the output shaft 4 of the intermittent indexing device 1A is defined as the "vertical direction", the side of the cam mechanism 8 as viewed from the indexing table 7 is defined as "downward", and the opposite side is defined as "upper". The vertical direction is sometimes called the "output axis direction". In this embodiment, the vertical direction is the vertical direction. Further, on the surface including both the input axis 3 and the output axis 4, the direction perpendicular to the vertical direction is defined as the "left-right direction", the right side of the paper on which FIGS. 1 and 2 are drawn is defined as "right", and the left side is defined as "left". ". Further, the direction perpendicular to the vertical direction and the horizontal direction is defined as the "front-back direction", the front side of the paper on which FIGS. 1 and 2 are drawn is defined as "front", and the back side is defined as "rear".

<Basic configuration of intermittent indexing device 1A>
The intermittent indexing device 1A is a device that converts the continuous rotational motion of the input shaft into the intermittent rotational motion of the output shaft. The intermittent indexing device may also be called an index device, an index unit, or the like. The intermittent indexing device 1A of the present embodiment is a cam-type intermittent indexing device. The cam-type intermittent indexing device is a device that generates an intermittent rotational motion on an output shaft to which a cam follower engaged with a cam is fixed by rotating an input shaft provided with a cam. Here, the "intermittent rotational movement" means that it is not continuous, and for example, it means that a period of rotation at predetermined time intervals and a period of non-rotation (retention) are repeated.

The intermittent indexing device 1A includes a housing 2, an input shaft 3, an output shaft 4, a bearing 5, an indexing table 7, and a cam mechanism 8.

The housing 2 is a housing component that houses and protects a part of the cam mechanism 8. Further, the housing 2 rotatably supports the input shaft 3, the output shaft 4, and the torque compensation rotating shaft 16 via a bearing 5, which will be described later.

The input shaft 3 is a rotatable shaft member for inputting a rotational driving force to the cam mechanism 8. A drive source 6 (not shown in FIG. 1) such as a motor is provided at one end of the input shaft 3 on the outer side of the housing 2, and the input shaft 3 rotates in response to a rotational drive force from the drive source 6. Elements on the input side, including the drive source 6 and the input shaft 3, may be collectively referred to as the "original section".

The output shaft 4 is a rotatable shaft member for transmitting the intermittent rotational movement generated by the cam mechanism 8 to the indexing table 7. The indexing table 7 is provided at one end of the output shaft 4 on the outer side of the housing 2, and performs an intermittent rotational motion together with the output shaft 4. The elements on the output side, including the output shaft 4 and the indexing table 7, may be collectively referred to as "subordinate clauses".

The bearing 5 is a member that rotatably supports the input shaft 3, the output shaft 4, and the torque compensation rotating shaft 16 described later with respect to the housing 2. The bearing 5 of the present embodiment is a rolling bearing, but the bearing 5 is not limited to this, and any kind of bearing may be used as long as it has a bearing function.

The indexing table 7 is a table member on which a product is placed and indexing work is performed. The indexing table 7 may be referred to as an indexing board or an index table. The indexing table 7 is provided at one end of the output shaft 4 on the outer side of the housing 2 and performs the same intermittent rotational motion as the output shaft 4.

The cam mechanism 8 is a motion conversion mechanism that converts the continuous rotational motion of the input shaft 3 into intermittent rotational motion of the output shaft 4, and torque compensation that reduces torque fluctuations that occur in the input shaft 3 and the output shaft 4. It has a mechanism. Hereinafter, the intermittent rotational movement of the output shaft 4 is referred to as "intermittent indexing movement". The cam mechanism 8 includes an indexing cam device 9A and a torque compensation device 12A (see FIG. 2). In the following description, the configuration and operation of the indexing cam device 9A will be described, and then the configuration and operation of the torque compensation device 12A will be described.

<Configuration and operation of indexing cam device 9A>
The indexing cam device 9A is a cam mechanism that generates an intermittent indexing motion. The indexing cam device 9A is a parallel cam that generates an intermittent indexing motion by combining two plate cams and a plurality of two rows of cam followers that engage with each plate cam. In the parallel cam, the input shaft 3 and the output shaft 4 are arranged in parallel. The indexing cam device 9A includes an indexing cam 10 and an indexing cam follower 11. The "indexing cam device", "indexing cam", and "indexing cam follower" may be simply referred to as "cam device", "cam", and "cam follower", respectively.

FIG. 3 is a diagram showing an overlapping state of the indexing cam 10 (upper cam 17A / lower cam 17B) and an overlapping state of the indexing cam follower 11 (upper cam follower 19A / lower cam follower 19B). The upper cam 17A and the lower cam 17B are collectively referred to as "indexing cam 10". Further, the upper cam follower 19A and the lower cam follower 19B may be collectively referred to simply as "index cam follower 11".

In FIG. 3, the outer line of the upper cam 17A is shown by a solid line, and the outer line of the lower cam 17B is shown by a broken line. The outer line of the upper cam follower 19A is shown by a solid line, and the outer line of the lower cam follower 19B is shown by a broken line.

The upper cam 17A and the lower cam 17B have the same shape, and one (for example, the upper cam 17A) is turned inside out with respect to the other (for example, the lower cam 17B), and the phases are changed in the rotation direction. It is attached to the input shaft 3 in a staggered manner. The upper cam 17A and the lower cam 17B may be fixed to the upper and lower side surfaces of the drive base provided on the input shaft 3, respectively.

The indexing cam 10 has a convex portion 18A that rotates the output shaft 4 by engaging with the indexing cam follower 11 and an arc portion 18B that does not engage with the indexing cam follower 11 and does not rotate the output shaft 4. And are formed.

The upper cam follower 19A and the lower cam follower 19B have the same shape, and are attached to the output shaft 4 with a phase shift of 30 degrees in the rotation direction. The upper cam follower 19A and the lower cam follower 19B may be fixed to both upper and lower side surfaces of a turret (not shown) provided on the output shaft 4, respectively.

The indexing cam follower 11 is formed with an engaging portion 20A that engages with the convex portion 18A of the indexing cam 10. The engaging portions 20A are formed at equal intervals in the rotation direction and radially. In the present embodiment, six engaging portions 20A are formed at intervals of 60 degrees for each upper cam follower 19A or for each lower cam follower 19B. As described above, the upper cam follower 19A and the lower cam follower 19B are out of phase by 30 degrees in the rotation direction, so that the indexing cam followers 11 (upper cam follower 19A and lower cam follower 19B) are 12 in total and 30 It will be formed at intervals of degrees.

In FIG. 3, the indexing cam 10 and the indexing cam follower 11 are configured such that when the input shaft 3 rotates once counterclockwise, the output shaft 4 rotates 60 degrees clockwise. That is, when the indexing cam 10 makes one rotation counterclockwise, two indexing cam followers 11 (upper cam follower 19A and lower cam follower 19B) are sent out clockwise. The rotation direction of the input shaft 3 (indexing cam 10) is not limited to counterclockwise, and may be clockwise. In this case, the output shaft 4 (indexing cam follower 11) is counterclockwise.

FIG. 4 is a cam curve diagram showing the operation of the indexing cam device 9A. The cam curve diagram shown in FIG. 4 shows the displacement (angle), speed (angular speed) of the output shaft 4 (indexing cam follower 11) in the rotation direction when the input shaft 3 (indexing cam 10) makes one rotation. It is a figure which showed the time change of acceleration (angular acceleration). In FIG. 4, the displacement is shown by a solid line, the velocity is shown by a broken line, and the acceleration is shown by a dotted line.

In FIG. 4, the period in which the convex portion 18A of the indexing cam 10 engages with the engaging portion 20A of the indexing cam follower 11 and rotates the output shaft 4 is referred to as a non-retention period (X in FIG. 4). Further, a period during which the convex portion 18A of the indexing cam 10 does not engage with the engaging portion 20A of the indexing cam follower 11 and the output shaft 4 is not rotated is referred to as a retention period (Y in FIG. 4). In the operation of the indexing cam device 9A of the present embodiment, when the input shaft 3 (indexing cam 10) makes one rotation, there is one non-staying period and one staying period, but the mode of operation is It is not limited to this. For example, by changing the characteristics such as the shape of the cam surface of the indexing cam 10 and the indexing cam follower 11, when the input shaft 3 (indexing cam 10) makes one rotation, the non-staying period and the staying period May be two or more. In addition, the number of non-staying periods and the number of staying periods may be different.

The start point of the cam curve shown in FIG. 4 is the start point of the non-staying period, that is, the convex portion 18A of the indexing cam 10 starts engaging with the engaging portion 20A of the indexing cam follower 11, and the output shaft 4 is rotationally driven. It's time to start doing. After this, the speed is accelerated from zero (acceleration period), reaches the maximum speed at a timing approximately in the middle of the non-stationary period X, and then decelerates (deceleration period). Then, at the end point of the non-retention period X, the speed becomes zero again. Further, during the stay period Y, the speed is maintained at zero.

Since the speed changes as described above, the acceleration of the output shaft 4 changes so as to be a positive acceleration in the acceleration period and a negative acceleration in the deceleration period.

<Torque fluctuation>
By the way, in the indexing cam device 9A that converts the continuous rotational motion of the input shaft 3 into the intermittent indexing motion of the output shaft 4, the torque acting on the output shaft 4 constantly fluctuates when it is driven. That is, as described above, the torque fluctuation is generated in the output shaft 4 based on the acceleration change that repeats alternately positive and negative of the output shaft 4. This torque fluctuation is one of the causes of mechanical vibration generated in the intermittent indexing device 1A. On the other hand, the reaction force of the torque acting on the output shaft 4 also acts on the input shaft 3, and this torque fluctuation is also one of the causes of the mechanical vibration generated in the intermittent indexing device 1A.

As described above, the causes of the mechanical vibration generated in the intermittent indexing device 1A are the torque vibration generated in the input shaft 3 (hereinafter referred to as input system torque vibration) and the torque vibration generated in the output shaft 4 (hereinafter referred to as output). There are two types (called system torque vibration). As a mechanism for suppressing these two torque fluctuations, a torque compensation device 12A is provided in the present embodiment.

<Structure and operation of torque compensation device 12A>
The torque compensation device 12A is a device that reduces input system torque vibration and output system torque vibration (see FIG. 2). The torque compensation device 12A includes a torque compensation cam 13, a torque compensation cam follower 14, a torque compensation rotating body 15, and a torque compensation rotating shaft 16. The torque compensation cam 13 of the torque compensation device 12A and the torque compensation cam follower 14 are composed of parallel cams like the indexing cam device 9A, although the characteristics such as the cam surface are different as described later.

FIG. 5 is a diagram showing an overlapping state of the torque compensation cam 13 (upper torque compensation cam 21A / lower torque compensation cam 21B) and an overlapping state of the torque compensation cam follower 14 (upper torque compensation cam follower 22A / lower torque compensation cam follower 22B). Is. The upper torque compensation cam 21A and the lower torque compensation cam 21B are collectively referred to as "torque compensation cam 13". Further, the upper torque compensating cam follower 22A and the lower torque compensating cam follower 22B may be collectively referred to simply as "torque compensating cam follower 14".

In FIG. 5, the outer line of the upper torque compensation cam 21A is shown by a solid line, and the outer line of the lower torque compensation cam 21B is shown by a broken line. The outer line of the upper torque compensating cam follower 22A is shown by a solid line, and the outer line of the lower torque compensating cam follower 22B is shown by a broken line.

The upper torque compensation cam 21A and the lower torque compensation cam 21B have the same shape, and one (for example, the upper torque compensation cam 21A) is turned inside out with respect to the other (for example, the lower torque compensation cam 21B). Therefore, it is attached to the input shaft 3 with a phase shift in the rotation direction. The upper torque compensation cam 21A and the lower torque compensation cam 21B may be fixed to both the upper and lower side surfaces of the drive base provided on the input shaft 3, respectively. As shown in FIG. 2, the torque compensation cam 13 is attached to the same shaft (input shaft 3) as the indexing cam 10.

The torque compensation cam 13 is engaged with the torque compensation cam follower 14 to rotate the torque compensation rotary shaft 16 at a speed Vmax, and the convex portion 18C and the connection portion 18E are engaged with the torque compensation cam follower 14. A connecting portion 18D is formed in which the compensation rotation shaft 16 is changed from the speed Vmax to Vmin and then changed from the speed Vmin to the speed Vmax.

The upper torque compensation cam follower 22A and the lower torque compensation cam follower 22B have the same shape and are attached to the torque compensation rotation shaft 16 with a phase shift of 30 degrees in the rotation direction. The upper torque compensation cam follower 22A and the lower torque compensation cam follower 22B may be fixed to both upper and lower side surfaces of a turret (not shown) provided on the torque compensation rotary shaft 16.

The torque compensation cam follower 14 is formed with an engaging portion 20B that engages with the convex portion 18C of the torque compensation cam 13. The engaging portions 20B are formed at equal intervals in the rotation direction and radially. In the present embodiment, six engaging portions 20B are formed for each upper torque compensating cam follower 22A or for each lower torque compensating cam follower 22B at intervals of 60 degrees. As described above, the upper torque compensating cam follower 22A and the lower torque compensating cam follower 22B are out of phase by 30 degrees in the rotation direction, so that the torque compensating cam follower 14 (upper torque compensating cam follower 22A and lower torque compensating cam follower 22B) Is formed in a total of 12 pieces at intervals of 30 degrees.

In FIG. 5, the torque compensation cam 13 and the torque compensation cam follower 14 are configured such that when the input shaft 3 makes one rotation counterclockwise, the torque compensation rotation shaft 16 rotates 180 degrees clockwise. That is, when the torque compensation cam 13 makes one rotation counterclockwise, six torque compensation cam followers 14 (upper torque compensation cam follower 22A and lower torque compensation cam follower 22B) are sent out clockwise. The rotation direction of the input shaft 3 (torque compensation cam 13) is not limited to counterclockwise, and may be clockwise. In this case, the torque compensation rotary shaft 16 (torque compensation cam follower 14) is counterclockwise.

The ratio of the degree of rotation of the torque compensation rotation shaft (torque compensation cam follower) to the degree of rotation of the output shaft (cam follower) when the input shaft makes one rotation is called the output rotation ratio. In the present embodiment, when the input shaft 3 rotates once, the output shaft 4 rotates 60 degrees (the number of feeds of the indexing cam follower 11 is two). Similarly, when the input shaft 3 rotates once, the torque compensation rotation shaft 16 rotates 180 degrees. In this case, the output rotation ratio is 3.

The torque-compensated rotating body 15 is an inertial body in which a rotating shaft (torque-compensated rotating shaft 16) is arranged at the center of gravity. The torque compensation rotating body 15 is sometimes called a flywheel. The magnitude of the moment of inertia of the torque-compensated rotating body 15 is designed according to the built-in indexing cam device 9A, but by increasing the output rotation ratio described above, the magnitude of the moment of inertia of the torque-compensated rotating body 15 is increased. Can be suppressed. The torque-compensated rotating body 15 is provided at one end of the torque-compensated rotating shaft 16 on the outer side of the housing 2, which will be described later, and rotates together with the torque-compensated rotating shaft 16.

The torque compensation rotary shaft 16 is a rotatable shaft member for transmitting the compensation torque generated by the torque compensation cam 13 and the torque compensation cam follower 14 (see FIGS. 1 and 2). The central axis of the torque compensation rotating shaft 16 is on the same axis as the central axis of the output shaft 4. In the present embodiment (FIGS. 1 and 2), a torque compensation rotary shaft 16 is provided on the outer periphery of the output shaft 4. Further, as will be described later, the rotation direction of the torque compensation rotation shaft 16 is the same as the rotation direction of the output shaft 4.

In the intermittent indexing device 1A of the present embodiment, the torque compensation rotating body 15 is arranged on the same side as the indexing table 7, that is, on the upper part of the intermittent indexing device 1A, so that the torque compensation rotating body 15 and the indexing table 7 are arranged. The distance L between the centers of gravity of the torque compensation rotating body 15 is reduced (see FIG. 1). In other words, the position of the center of gravity of the indexing table 7 and the position of the center of gravity of the torque compensation rotating body 15 are on the same side with respect to the torque compensation cam follower 14. As a result, disturbance due to moment load can be reduced.

FIG. 6 is a cam curve diagram showing the operation of the torque compensating device 12A. The cam curve diagram shown in FIG. 6 shows the displacement (angle), speed (angular speed) of the torque compensation rotation shaft 16 (torque compensation cam follower 14) in the rotation direction when the input shaft 3 (torque compensation cam 13) makes one rotation. It is a figure which showed the time change of acceleration (angular acceleration). In FIG. 6, the displacement is shown by a solid line, the velocity is shown by a broken line, and the acceleration is shown by a dotted line. Further, for temporal comparison with the cam curve (FIG. 4) representing the operation of the above-mentioned indexing cam device 9A, the non-staying period (X period) of the cam device described in FIG. 4 and the staying of the cam device The period (Y period) is also shown in FIG.

As shown in FIG. 6, a certain speed Vmax is maintained during the dwelling period. After the start point of the non-staying period X of the cam device, the speed is decelerated (deceleration period), the speed becomes Vmin at a timing substantially intermediate to the non-staying period X of the cam device, and then the speed is accelerated (acceleration period). Then, at the end point of the non-staying period X of the cam device, the speed becomes the speed Vmax again.

The above operation will be described with reference to FIGS. 4 and 6 with reference to the operation of the indexing table 7 (output shaft 4) and the torque compensation rotating body 15 (torque compensation rotating shaft 16). That is, at the timing when the indexing table 7 starts to rotate, the torque compensation rotating body 15 that has maintained the speed Vmax starts decelerating. The torque compensating rotating body 15 reaches a speed of Vmin at an intermediate timing of indexing of the indexing table 7, and then the torque compensating rotating body 15 starts accelerating. At the timing of the end of indexing of the indexing table 7, the torque compensation rotating body 15 reaches the speed Vmax again.

<Reduction of torque fluctuation acting on input shaft 3 and output shaft 4>
FIG. 7 is a diagram showing a temporal change of the input system torque vibration. The solid line is the torque Tc1 acting on the input shaft 3 driven by the rotation of the indexing table 7, and the dotted line is the torque Tc2 acting on the input shaft 3 driven by the rotation of the torque compensation rotating body 15. As shown in FIG. 7, the torque compensating device 12A of the present embodiment acts so as to cancel Tc1 and Tc2 acting on the input shaft 3 with each other. Since the difference between Tc1 and Tc2 appears as the torque fluctuation acting on the input shaft 3, the torque fluctuation acting on the input shaft 3 becomes substantially zero in FIG. 7. That is, the torque acting on the input shaft 3 is offset by the torque generated by the rotation of the torque compensating rotating body 15. As a result, the torque compensation device 12A of the present embodiment reduces the torque vibration of the input system.

From another point of view, since the torque characteristics of the indexing table 7 and the torque characteristics of the torque compensating rotating body 15 are set to cancel each other out, it is necessary for the rotation of the indexing table 7. The inertial torque is supplied by the rotational drive of the torque compensating rotating body 15. Therefore, in order to maintain the rotation of the indexing table 7, it is only necessary to input torques other than this inertial torque. That is, the torque compensating device 12A of the present embodiment has an energy saving effect because the motor capacity of the drive source 6 can be reduced by suppressing the torque vibration of the input system.

FIG. 8 is a diagram showing the temporal change of the output system torque fluctuation. The solid line is the acceleration A1 of the indexing table 7, and the broken line is the acceleration A2 of the torque compensating rotating body 15. The difference between A1 and A2 is shown by a dotted line. In the non-staying period X of the cam device, acceleration changes occur in both the indexing table 7 and the torque compensation rotating body 15, and output system torque fluctuations based on these changes occur.

As described above, in the torque compensation device 12A of the present embodiment, the rotation axis of the torque compensation rotating body 15 (torque compensation rotation shaft 16) is on the same axis as the rotation axis of the indexing table 7 (output shaft 4). Moreover, the rotation direction is also the same. Therefore, it appears as a torque fluctuation acting on the output shaft 4 based on the difference (dotted line in FIG. 8) between the acceleration A1 of the indexing table 7 and the acceleration A2 of the torque compensating rotating body 15. As a result, in the torque compensation device 12A of the present embodiment, the fluctuation of the output system torque is reduced.

=== 1st Embodiment (variation example) ===
FIG. 9 is a schematic explanatory view of the intermittent indexing device 1B according to the modified example of the first embodiment. FIG. 10 is a detailed explanatory view of the intermittent indexing device 1B according to the modified example of the first embodiment. In the intermittent indexing device 1A of the first embodiment described above, the indexing table 7 and the torque compensating rotating body 15 are arranged on the same side (upper side in FIG. 2) on the output shaft 4. In the intermittent indexing device 1B according to the modified example of the present embodiment, the indexing table 7 is on one side (upper side in FIGS. 9 and 10) on the output shaft 4, and the indexing table 7 is on the other side (FIGS. 9 and 10). Then, the torque compensation rotating body 15 is arranged on the lower side). Except for the arrangement relationship between the indexing table 7 and the torque compensation rotating body 15, the configuration is the same as that of the intermittent indexing device 1A described in the first embodiment.

In the modified example of the first embodiment, the indexing table 7 and the torque are arranged by arranging the indexing table 7 at the upper part of the intermittent indexing device 1B and the torque compensation rotating body 15 at the lower part of the intermittent indexing device 1B. The distance L between the centers of gravity of the compensating rotating body 15 is larger than that of the intermittent indexing device 1A of the first embodiment. Even in the torque compensating device 12B of the modified example of the first embodiment, the rotating shaft of the torque compensating rotating body 15 (torque compensating rotating shaft 16) is on the same axis as the rotating shaft of the indexing table 7 (output shaft 4). Yes, and the direction of rotation is the same. Therefore, the input system torque vibration and the output system torque vibration can be suppressed regardless of the size of the distance L between the centers of gravity.

=== Second embodiment ===
FIG. 11 is a top view (partial sectional view) of the intermittent indexing device 1C of the second embodiment. FIG. 12 is a side view (partial sectional view) of the intermittent indexing device 1C of the second embodiment. FIG. 13 is a diagram showing a portion of the indexing cam device 9B of the intermittent indexing device 1C of the second embodiment.

In the following description of the second embodiment, each direction is defined as shown in FIGS. 11 and 12. That is, the direction parallel to the output shaft 4 of the intermittent indexing device 1C is the "vertical direction", the side of the indexing cam device 9B as viewed from the indexing table 7 is "downward", and the opposite side is "upper". And. The vertical direction is sometimes called the "output axis direction". In this embodiment, the vertical direction is the vertical direction. Further, on the surface including the input shaft 3, the direction perpendicular to the input shaft 3 is defined as "left-right direction", the right side of the paper on which FIGS. 11 and 12 are drawn is defined as "right", and the left side is defined as "left". Further, the direction parallel to the input shaft 3 is defined as the "front-back direction", the side of the torque compensating rotating body 15 as viewed from the indexing table 7 is defined as "front", and the opposite side is defined as "rear".

The indexing cam device 9A of the intermittent indexing device 1A of the first embodiment is composed of a parallel cam, whereas the indexing cam device 9B of the intermittent indexing device 1C of the second embodiment is a roller gear cam. It is composed. Hereinafter, the differences between the intermittent indexing device 1C of the present embodiment and the intermittent indexing device 1A of the first embodiment will be mainly described.

Unlike the intermittent indexing device 1A composed of the parallel cams of the first embodiment, the intermittent indexing device 1C composed of the roller gear cams of the present embodiment has the input shaft 3 and the output shaft 4 arranged at twisted positions. ing. As described above, the intermittent indexing device 1C of the present embodiment can freely select the rotation direction of the output shaft 4 with respect to the rotation direction of the input shaft 3.

The indexing cam device 9B of the present embodiment includes an indexing roller gear cam 23A and an indexing roller follower 24A.

The indexing roller gear cam 23A is a cam portion mechanism provided on the input shaft 3. The indexing roller gear cam 23A is configured such that the tapered rib 25A with which the roller follower engaging portion 25B, which will be described later, engages is oblique with respect to the front-rear direction.

The indexing roller follower 24A is a mechanism of a cam follower portion provided on the output shaft 4. The indexing roller follower 24A includes a roller follower engaging portion 25B provided on the turret 25C. The roller follower engaging portions 25B of the present embodiment are formed at equal intervals and radially in the rotation direction of the turret 25C.

The cam mechanism of the torque compensation device 12B is also composed of a roller gear cam including a torque compensation roller gear cam 23B and a torque compensation roller follower 23B, but the motion generated by the torque compensation roller gear cam 23B and the torque compensation roller follower 23B The rotation transmission unit 26 is provided in order to transmit the power to the torque compensation rotating body 15 provided at the lower part of the indexing table 7.

=== Other embodiments ===
The above-described embodiment is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. It goes without saying that the present invention can be modified or improved without deviating from the gist thereof, and the present invention includes an equivalent thereof.

The cam mechanism of the above-described embodiment is composed of a parallel cam mechanism (first embodiment) and a roller gear cam mechanism (second embodiment), but is not limited to this, and may be composed of a barrel cam.

1A, 1B, 1C intermittent indexer, 2 housing, 3 input shaft, 4 output shaft,
5 bearings, 6 drive sources, 7 indexing tables, 8 cam mechanisms,
9A, 9B indexing cam device, 10 indexing cam, 11 indexing cam follower,
12A, 12B Torque compensator, 13 Torque compensating cam 14 Torque compensating cam follower, 15 Torque compensating rotating body, 16 Torque compensating rotating shaft,
17A upper cam, 17B lower cam, 18A, 18C convex part,
18B arc part, 18D, 18E connection part,
19A upper cam follower, 19B lower cam follower,
20A, 20B engaging part,
21A upper torque compensation cam, 21B lower torque compensation cam,
22A Upper torque compensation cam follower, 22B Lower torque compensation cam follower 23A Roller gear cam for indexing 23B Torque compensation roller gear cam 24A Roller follower for indexing 24B Torque compensation roller follower 25A Tapered rib 25B Roller follower Engagement part 25C Turret 26 Rotation transmission part

Claims (8)

An intermittent indexing device that converts the continuous rotational movement of the input shaft into the intermittent rotational movement of the output shaft.
A cam device having a cam provided on the input shaft and a cam follower fixed to the output shaft and engaged with the cam.
The input shaft has a torque compensation cam provided on the input shaft, a torque compensation cam follower engaged with the torque compensation cam, and a torque compensation rotating body provided so as to be connected to the torque compensation cam follower. Equipped with a torque compensation device that reduces the torque fluctuation that acts
The torque compensation rotating body is arranged so as to rotate on the same axis as the output shaft.
An intermittent indexing device characterized in that the direction of rotation acting on the output shaft and the direction of rotation of the torque compensating rotating body are the same. The cam device has a stationary period in which the output shaft does not rotate even if the cam rotates, and a non-resident period in which the output shaft rotates with the rotation of the cam.
The torque-compensated rotating body is provided so as to perform a rotational motion in which acceleration and deceleration of the rotational speed are alternately repeated at regular intervals.
The torque compensation rotating body is
The intermittent indexing device according to claim 1, wherein a maximum value of rotation speed is maintained during the staying period, and the rotation speed is smaller than that of the non-staying period. The intermittent indexing device according to claim 2, wherein the torque-compensated rotating body reaches a minimum rotational speed at a predetermined timing of the non-stationary period. Further provided with an indexing table fixed to the output shaft and on which intermittent indexing motion acts.
According to claims 1 to 3, the position of the center of gravity of the indexing table and the position of the center of gravity of the torque compensation rotating body are on the same side of the torque compensation cam follower on the line of the output shaft. The described intermittent indexing device. The intermittent indexing device according to claim 1 to 4, wherein the cam and the torque compensation cam are parallel cams. The intermittent indexing device according to claim 1 to 4, wherein the cam and the torque compensation cam are roller gear cams. A torque compensating device for reducing torque fluctuations acting on the input shaft in an intermittent indexing device that converts continuous rotational movement of the input shaft into intermittent rotational movement of the output shaft.
The torque compensation cam provided on the input shaft and
A torque compensation cam follower that engages with the torque compensation cam,
It is provided with a torque compensation rotating body provided so as to be connected to the torque compensation cam follower.
The torque compensation rotating body is arranged so as to rotate on the same axis as the output shaft.
A torque compensating device characterized in that the direction of rotation acting on the output shaft and the direction of rotation of the torque compensating rotating body are the same. A torque compensation method for reducing torque fluctuations acting on the input shaft in an intermittent indexing device that converts continuous rotational movement of the input shaft into intermittent rotational movement of the output shaft.
A torque compensation cam provided on the input shaft, a torque compensation cam follower engaged with the torque compensation cam, and a torque compensation rotating body provided so as to be connected to the torque compensation cam follower are provided.
A torque compensation method characterized in that the torque compensation rotating body is rotated on the same axis as the output shaft and in the same direction as the rotation acting on the output shaft.

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