JP4859685B2 - Swivel table device - Google Patents

Description

  The present invention relates to a turning table device that adjusts the rotation angle of a turntable on which a workpiece to be processed is placed, and is applied to various machine devices such as various robots, semiconductor manufacturing devices, precision machines, and machine tools.

As this type of turning table device, a structure shown in FIG. 5 is known (Patent Document 1).
In this device, when the rack (15) is linearly driven in the left-right direction with respect to the paper surface of FIG. 5 by the linear solenoid (14), the driving force is transmitted through the meshing portion of the rack (15) and the pinion (11). Then, it is transmitted to the turntable (10) and rotates, so that a workpiece (not shown) on the turntable (10) can be rotated and processed by a processing device (not shown).
JP-A-2005-69871

However, the conventional device requires a gear cutting operation at the time of manufacturing the rack (15) and the pinion (11), which increases the cost of the entire apparatus.
Further, since the driving force of the linear solenoid (14) is transmitted from the meshing portion of the rack (15) and the pinion (11) to the turntable (10) side, it is caused by inevitable backlash generated in the meshing portion. The accuracy of angle control of the turntable (10) is lowered.
Furthermore, when the turntable (10) is rotated at the beginning of rotation or when the rotation direction is reversed, the meshing portion rattles and the smooth rotation of the turntable (10) is hindered.

In addition, since a linear rack (15) set to a length longer than the outer circumference of the pinion (11) is required, the entire apparatus is compared with a device using a small-diameter gear instead of the rack (15). Increase in size.
As another conventional example, a structure in which the center axis of the turntable and the drive motor are connected in a power transmission state is widely known. However, in this case, the rotational speed of the drive motor is reduced to turn the turntable. Since it is necessary to incorporate a speed reduction mechanism for transmission into the drive motor, there is a problem in that the structure is complicated and the cost is increased accordingly.

  The present invention has been made in view of the above points, and it is possible to ensure smooth rotation of the turntable even at the initial stage of rotation of the turntable or at the time of reversal of the rotation direction, and to reduce the size of the entire apparatus. Furthermore, it is an object to prevent the structure from becoming complicated and to suppress the cost increase.

[Invention of Claim 1]
The solution means of the invention according to claim 1 for solving the above-mentioned problem is as follows:
“Turntable for mounting work,
A rail member that is bent in a circular or arc shape coaxial with the rotation axis of the turntable and that rotates integrally with the turntable;
A pair of drive rollers for clamping the rail member;
A drive motor for rotating one of the drive rollers;
A pair of reversing rollers attached to the roller shaft of each driving roller and transmitting the rotation of the driving motor to the other driving roller.
According to the above solution, when one drive roller is rotated by the drive motor, the rotational force is transmitted from the roller shaft of the one drive roller to the other roller shaft via a pair of reverse rollers, The drive roller attached to the other roller shaft rotates. Thereby, the rotational force of the drive motor is transmitted to both drive rollers, and the drive force of the drive motor is transmitted to the two pressure contact portions of the rail member and both drive rollers. Thereby, a turntable rotates integrally with a rail member.
According to the above solution, since the turntable is rotated by the pair of driving rollers that sandwich the rail member, unlike the conventional one using the rack (15) and the pinion (11), the gear cutting process is performed. Is eliminated, and the cost of the turntable device can be reduced.

Further, in the power transmission path from the drive motor to the turntable, there is no meshing portion such as the pinion (11) and the rack (15) where backlash occurs as in the conventional case. Accordingly, it is possible to prevent a decrease in accuracy of the angle control of the turntable due to the backlash, and to ensure a smooth rotation of the turntable even at the initial rotation of the turntable or when the rotation direction is reversed.
In addition, since the turntable is rotated by a pair of driving rollers that sandwich the rail member, it is not necessary to provide a rack (15) that is longer than the outer peripheral dimension of the pinion (11) as in the conventional one described above, and Miniaturization can be achieved.

[Invention of Claim 2]
In the invention according to claim 1,
“The pair of driving rollers are configured to clamp the rail member from the inside and outside in the radial direction of the circle,
The outer diameters of the pair of drive rollers are set equal,
Ra1 represents the outer diameter of the reversing roller attached to the roller shaft of the driving roller located outside the radial direction,
The outer diameter of the reversing roller attached to the roller shaft of the driving roller located inside in the radial direction is Rb1,
The inner diameter of the circularly bent rail member is r2,
When the outer diameter of the circularly bent rail member is r1,
(Ra1 / Rb1) = (r2 / r1) ”.
In this case, the outer diameters of the pair of drive rollers are set to be equal, and the relationship between the outer diameters Ra1 and Rb1 of the reversing rollers and the inner and outer diameters r2 and r1 of the rail member is (Ra1 / Rb1) = (R2 / r1) is set. Therefore, as is clear from the description of (Equation 1) described in the later-described embodiment, the peripheral speed of the inner peripheral surface of the rail member matches the peripheral speed of the driving roller that is pressed against the rail member, and the rail The peripheral speed of the outer peripheral surface of the member coincides with the peripheral speed of the drive roller pressed against the member. Thereby, it becomes possible to drive the turntable with less power transmission loss.

[Invention of Claim 3]
In the invention according to claim 1,
“The pair of driving rollers are configured to clamp the rail member from the inside and outside in the radial direction of the circle,
The outer diameters of the pair of reverse rollers are set equal,
Ra2 represents the outer diameter of the driving roller located outside the radial direction,
The outer diameter of the driving roller located inside the radial direction is Rb2,
The inner diameter of the circularly bent rail member is r2,
When the outer diameter of the circularly bent rail member is r1,
(Rb2 / Ra2) = (r2 / r1) ”.
In this configuration, the outer diameters of the pair of reversing rollers are set to be equal, and the relationship between the inner and outer diameters r2 and r1 of the rail members and the outer diameters Rb2 and Ra2 of the drive rollers is (Rb2 / Ra2) = (R2 / r1) is set. Therefore, as is clear from the description of (Equation 3) described in an embodiment described later, it is possible to drive the turntable with less power transmission loss.

[Invention of Claim 4]
In the invention according to claims 1 to 3,
In the case of “the lubricant is supplied to the pressure contact portion between the pair of driving rollers and the rail member”, the power transmission between the driving roller and the rail member can be smoothly performed.

The present invention has the following specific effects.
In the invention according to claim 1, as already described, unlike the conventional one using the rack (15) and the pinion (11), gear cutting is not required, and the cost of the turning table device can be reduced.
In addition, since there is no meshing portion such as the pinion (11) and the rack (15) where backlash occurs, the angle control accuracy of the turntable is improved as compared with the conventional one described above, and the initial rotation of the turntable and Even when the rotation direction is reversed, the turntable can be smoothly rotated.

In addition, since the turntable is rotated by a pair of driving rollers that sandwich the rail member, it is not necessary to provide a rack (15) that is longer than the outer peripheral dimension of the pinion (11) as in the conventional one described above, and Miniaturization can be achieved.
Furthermore, since the rotation speed of the turntable can be set by using a drive roller or reverse roller with a predetermined outer diameter, it is necessary to incorporate a special reduction mechanism in the drive motor to reduce the rotation speed of the drive motor. There is no. Therefore, it is possible to prevent the structure from becoming complicated, and from this point, it is possible to reduce the cost.

  Further, the driving force of the driving motor is transmitted to both side surfaces of the rail member. Therefore, compared with the case where the driving force of the drive motor is transmitted to only one side surface of the rail member, the driving force of the drive motor is transmitted to the rail member with a good balance, so that the turntable rotates more smoothly.

In the inventions according to claims 2 and 3, the turntable can be driven with less power transmission loss.
In the invention according to claim 4, as described above, the power transmission between the drive roller and the rail member can be performed smoothly.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the turning table device according to the embodiment of the present invention includes a center shaft (23) rotatably supported by a bearing (21) on a fixed base (22), and the center. The screw shaft (24) protruding from the upper end of the shaft (23) passes through the bottom wall of the recess (25) for shaft insertion formed at the center of the disc-shaped turntable (20). . The turntable (20) is fixed to the central shaft (23) by the screw shaft (24) and the tightening nut (26) screwed to the screw shaft (24). (20) and the central shaft (23) are integrally rotated while being supported by the bearing (21).

Near the outer periphery of the lower surface of the turntable (20), a rail member (29) bent in a circular shape coaxial with the rotation shaft (L) is projected.
The friction drive unit (A) that rotationally drives the turntable (20) is disposed in the vicinity of the outer end of the fixed base (22) located below the turntable (20).

  As shown in FIGS. 2 and 3, the friction drive unit (A) includes a U-shaped arm (5) serving as a housing fixed to the fixed base (22) with fixing bolts (28), and a U-shaped arm (5). A pair of drive rollers (5a) (5b) pivotally supported by two arm members (50a) (50b) and sandwiching the rail member (29) with a predetermined clamping pressure; and one arm member (50a) and A drive motor (4) such as a pulse motor connected to the roller shaft (51a) of the drive roller (5a) by a joint (52) and the rotation of one roller shaft (51a) are transmitted to the other drive roller (5b). A pair of reversing rollers (53a) and (53b) is provided.

  The U-shaped arm (5) is made of various materials such as iron, aluminum and plastic. Each of the arm members (50a) and (50b) of the U-shaped arm (5) can be elastically deformed in a direction in which the arm members (50a) and (50b) come into contact with and away from each other. The base end portions (54) of the members (50a) and (50b) are formed in a predetermined shape or thickness. The inner width between the pair of drive rollers (5a) (5b) pivotally supported by the two arm members (50a) (50b) is the rail member (29) sandwiched between the pair of drive rollers (5a) (5b). ) Is set slightly narrower than the width. As a result, the rail member (29) is clamped with a predetermined pressing force by the pair of drive rollers (5a) and (5b).

  In addition, the U-shaped arm (5) is fastened to the end of the arm members (50a) and (50b) by the fastening bolts (56) at the tips (55a) and (55b). The pressure contact force of the drive rollers (5a) and (5b) can be adjusted. A disc spring (59) or the like is inserted into the head of the tightening bolt (56) to receive the tightening force of the tightening bolt (56). Also from this configuration, the driving rollers (5a) and (5b) are elastically pressed against the rail member (29). Due to the elastic deformation of each arm member (50a) (50b) and the disc spring (59) interposed in the head of the tightening bolt (56), the roundness and width error of the rail member (29) can be reduced. It is possible to prevent an overload of the pressure contact force between the rail member (29) and the pair of drive rollers (5a) and (5b).

  Further, as shown in FIG. 3, a reversing roller (53a) (53b) is provided on the roller shaft (51a) (51b) of each drive roller (5a) (5b), and this pair of reversing rollers (53a) (53b) Are arranged so as to be pressure-contacted so as to be able to transmit rotation. Thus, when one drive roller (5a) is rotated by a drive motor (4) attached to one arm member (50a), the other drive roller (5b) is passed through the pair of reverse rollers (53a) and (53b). Is rotated in the reverse direction, whereby the rail member (29) is sent out by the drive rollers (5a) and (5b), and the turntable (20) is rotated.

In the present embodiment, when the turntable (20) rotates, the peripheral speed of the inner peripheral surface of the rail member (29) and the peripheral speed of one drive roller (5b) match, and the rail member (29 The dimensions of the respective parts are set so that the peripheral speed of the outer peripheral surface of) matches the peripheral speed of the other drive roller (5a). Specifically, the drive rollers (5a) and (5b) have the same outer diameter and are attached to the roller shaft (51a) of the drive roller (5a) located outside the turntable (20) in the radial direction. The outer diameter (in this embodiment, the radius) of the reverse roller 53a is Ra1, and the reverse roller 53b attached to the roller shaft 51b of the drive roller 5b located inside the radial direction The outer diameter (radius in this embodiment) is Rb1, the outer radius of the rail member (29) (distance from the rotation axis (L) as the rotation center line of the turntable (20)) is r1, and the inner radius is r2. if you did this,
(Ra1 / Rb1) = (r2 / r1) (Formula 1)
Is set.
(Expression 1) is obtained as follows.
As shown in FIGS. 3 and 4, the radii of the inner and outer drive rollers (5b) and (5a) are Rb2 and Ra2, respectively, the outer drive roller (5a) is θ2, and the inner drive roller (5b) is θ3. It is assumed that the turntable (20) is rotated by θ1 by rotating only by.
Then, “r1 × θ1 = Ra2 × θ2”, “r2 × θ1 = Rb2 × θ3”, “Rb1 × θ3 = Ra1 × θ2”.
r2 / r1 = (Rb2 / Ra2) × (Ra1 / Rb1) (Formula 2)
It becomes.
In this embodiment, since “Rb2 = Ra2” is set, (Equation 1) is obtained from these relationships.

As shown in FIG. 3, the roller shafts (51a) (51b) of the drive rollers (5a) (5b) are arm members (50a) (50b) that can be rotated by bearings (58a) (58b) such as roller bearings. It is pivotally supported inside. The drive rollers (5a) and (5b) and the reversing rollers (53a) and (53b) can be manufactured from materials such as engineering plastic and urethane as well as hardened and polished metal, for example. The drive rollers (5a) and (5b) are manufactured integrally with the roller shafts (51a) and (51b), for example, by quenching and polishing of bearing steel, but are manufactured separately from the roller shafts (51a) and (51b). It may be assembled. The roller shafts (51a) and (51b) themselves may constitute the drive rollers (5a) and (5b).
In this case, the reversing rollers (53a) and (53b) are pressed against each other in a state where the driving rollers (5a) and (5b) sandwich the rail member (29) by the elastic force of the arm members (50a) and (50b). The dimensions of each part are set as follows.

  In addition, a lubricant such as traction oil (this oil is effective when the rollers (5a) (5b) (53a) (53b) are made of metal) is provided on the constituent walls of the arm members (50a) (50b). Is provided with an oil-impregnated layer (6) impregnated with felt, open-cell foam material, etc. 5b) and the reverse rollers 53a and 53b are brought into contact with each other. Therefore, a very small amount of lubricant is supplied to each of the driving rollers (5a) (5b) and the reversing rollers (53a) (53b) only when the rollers rotate due to the capillary phenomenon of the felt (60). As a result, each part such as the driving rollers (5a) and (5b), the reversing rollers (53a) and (53b), the rail member (29), and the like is in a semi-dry state by the lubricant so that friction transmission can be performed. By supplying the lubricant, fretting of the driving rollers (5a) and (5b), the rail member (29), the reversing rollers (53a) and (53b), and the like is prevented.

  In the swivel table device according to the present embodiment, in the U-shaped arm (5), the arm members (50a) (50b) provided with the drive rollers (5a) (5b) are easily elastically deformed in the direction in which they come in contact with and away from each other. When the rail member (29) is attached, the pair of drive rollers (5a) (5b) receive the elastic force of each arm member (50a) (50b) and the rail member ( 29) will be clamped from both sides. Even when the friction drive unit (A) is driven, the pair of drive rollers (5a) and (5b) sandwich the rail member (29) with the same pressure contact force. In addition, since each arm member (50a) (50b) has a structure that is easily elastically deformed, even if the surface of the drive roller (5a) (5b) or the rail member (29) is worn, the amount of wear of each arm member (50a) (50b) The members (50a) and (50b) approach each other, and a pinching pressure is stably applied between the drive rollers (5a) and (5b) and the rail member (29).

  The rail members (5a) and (5b) of the drive rollers (5a) and (5b) are fastened by the fastening bolts (56) and the disc springs (59) to which the tip portions (55a) and (55b) of both arm members (50a and 50b) are fastened. 29) It is possible to adjust the clamping pressure against. Thus, the pair of driving rollers (5a) and (5b) can stably apply the same clamping pressure to the rail member (29) from the inner and outer peripheral sides, and the pair of reversing rollers (53a) and (53b). ), The same rotational driving force is transmitted from the inner and outer peripheral sides of the rail member (29) by the pair of driving rollers (5a) and (5b).

Therefore, the driving force of the driving motor (4) is transmitted to the rail member (29) in a balanced manner as compared with the case where the driving force of the driving motor (4) is transmitted to only one side surface of the rail member (29). The turntable (20) rotates smoothly.
In this case, since the rail member is clamped by the pair of drive rollers, there is no room for backlash unlike the conventional one using the pinion (11) and the rack (15). Therefore, the driving force is immediately transmitted from the driving rollers (5a) and (5b) to the rail member (29) side even at the initial stage of rotation of the turntable (20) or when the rotation direction is reversed. Smoothly rotates. In addition, the cost increase can be suppressed because the cutting of the rack (15) and the like is unnecessary.

  In addition, since the turntable (20) is rotated by a pair of drive rollers (5a) and (5b) that sandwich the rail member (29), a rack that is longer than the outer peripheral dimension of the pinion (11) as in the conventional one described above. There is no need to provide (15), which makes it possible to reduce the size of the entire apparatus.

In the above embodiment, the radius Ra2 of one drive roller (5a) and the radius Rb2 of the other drive roller (5b) are made equal while the radius of the reversing roller (53a) corresponding to the drive roller (5a) is set. The relationship between Ra1 and the radius Rb1 of the reversing roller (53b) corresponding to the driving roller (5b) was set as shown in (Equation 1). On the other hand, the radius Ra1 of one reversing roller (53a) and the radius Rb1 of the other reversing roller (53b) are made equal, while the radius Ra2 of the driving roller (5a) corresponding to the reversing roller (53a) and the other reversal are reversed. The relationship of the radius Rb2 of the driving roller (5b) corresponding to the roller (53b)
r2 / r1 = Rb2 / Ra2 (Formula 3)
Even if set as described above, it is possible to prevent slippage between the drive rollers (5a) and (5b) and the rail member (29). (Expression 3) can be obtained by making Ra1 and Rb1 equal in (Expression 2).
In the above embodiment, the rail member (29) is configured in a circular shape coaxial with the rotational axis (L), but the rail member (29) is configured in an arc shape coaxial with the rotational axis (L), The turntable (20) may reciprocate the arc.

Sectional drawing of the turning table apparatus which concerns on embodiment of this invention The enlarged bottom view of the arrangement | positioning part of a friction drive unit (A) in the turning table apparatus which concerns on embodiment of this invention. The expanded sectional view of the arrangement | positioning part of a friction drive unit (A) in the turning table apparatus which concerns on embodiment of this invention. The bottom view which shows the relationship between the turntable (20) and drive roller (5a) (5b) in the turning table apparatus which concerns on embodiment of this invention. Illustration of conventional example

Explanation of symbols

(5a) (5b) ・ ・ ・ Drive roller
(20) ・ ・ ・ Turntable
(29) ・ ・ ・ Rail member
(40) ・ ・ ・ Drive motor
(51a) (51b) ・ ・ ・ Roller shaft
(53a) (53b) ・ ・ ・ Reversing roller
(W) ・ ・ ・ Work

Claims (4)

A turntable for mounting work,
A rail member that is bent in a circular or arc shape coaxial with the rotation axis of the turntable and that rotates integrally with the turntable;
A pair of drive rollers for clamping the rail member;
A drive motor for rotating one of the drive rollers;
A turning table device comprising a pair of reversing rollers attached to a roller shaft of each of the driving rollers and transmitting the rotation of the driving motor to the other driving roller. The swivel table device according to claim 1,
The pair of drive rollers is configured to clamp the rail member from the inside and outside in the radial direction of the circle,
The outer diameters of the pair of drive rollers are set equal,
Ra1 represents the outer diameter of the reversing roller attached to the roller shaft of the driving roller located outside the radial direction,
The outer diameter of the reversing roller attached to the roller shaft of the driving roller located inside in the radial direction is Rb1,
The inner diameter of the circularly bent rail member is r2,
When the outer diameter of the circularly bent rail member is r1,
A turning table device in which (Ra1 / Rb1) = (r2 / r1) is set. The swivel table device according to claim 1,
The pair of drive rollers is configured to clamp the rail member from the inside and outside in the radial direction of the circle,
The outer diameters of the pair of reverse rollers are set equal,
Ra2 represents the outer diameter of the driving roller located outside the radial direction,
The outer diameter of the driving roller located inside the radial direction is Rb2,
The inner diameter of the circularly bent rail member is r2,
When the outer diameter of the circularly bent rail member is r1,
A turning table device in which (Rb2 / Ra2) = (r2 / r1) is set. In the turning table device according to any one of claims 1 to 3,
A turning table device in which a lubricant is supplied to a pressure contact portion between the pair of drive rollers and the rail member.

Images