JPH03153904A - Straight-rotary drive device - Google Patents

Abstract

PURPOSE:To connect an operating fluid supply tube to a cylinder side without using a rotary joint by moving a guide rail slidably supporting a follow-up unit together with a cylinder tube around the cylinder tube by a rotary actuator. CONSTITUTION:A table 20 is slidably installed and supported between a cylinder tube 1 and a guide rail 19. The table 20 consists of a block body 21 and holding plates 22 joined and fixed on its both ends, and a follow-up body 23 exists between the block body 21 and the cylinder tube 1. The follow-up body 23 is composed of permanent magnets 25 and yokes 26 juxtaposed between a pair of bearings 24 and both the bearings 24, and turnably fixed and supported on the cylinder tube 1. The table 20 installed and supported between the guide rail 19 and the cylinder tube 1 is turnable with respect to the cylinder tube 1. The guide rail 19 is thus moved around the cylinder tube 1 centered on a center-axis line l2 of the cylinder tube 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a rodless system that uses magnetic attraction to move a rodless piston inside a cylinder tube made of a non-magnetic material to follow a tracking unit outside the cylinder tube. This invention relates to a linear one-rotation drive device using a type cylinder.

[Prior Art] This type of drive device is disclosed in Japanese Unexamined Patent Publication No. 60-62478 and Japanese Utility Model Application No. 61-77402. In each of these conventional devices, the entire rodless cylinder can be rotated around its axis, and in addition to the linear movement of the follower unit due to the reciprocating linear movement of the piston, which is inherent in rodless cylinders, the rotation of the follower unit due to the rotation of the cylinder is also possible. It is possible. The combination of these two types of movement increases the degree of freedom in the movement form of the follow-up unit.

[Problems to be Solved by the Invention] However, in a configuration in which the entire rodless cylinder rotates, the impact when the rotation stops is large due to the large inertia, and a shock wave is generated to the mounting member such as the workpiece or chuck mounted on the follow-up unit. We cannot ignore the negative effects of Furthermore, in order to rotate the entire cylinder, it is necessary to provide a rotor joint at the connection between the fluid supply pipe and the cylinder, which inevitably complicates the piping connection configuration.

An object of the present invention is to provide a drive device that can solve the above-mentioned problems in a linear one-rotation drive device using a rodless cylinder.

[Means for Solving the Problems] To achieve this, in the present invention, a rotary actuator is assembled to a rodless cylinder, and a follower unit that follows a piston in a cylinder tube is rotatably fitted and supported on the cylinder tube. The guide rails are arranged parallel to the cylinder tube so that they can revolve around the cylinder tube, the center of revolution of the guide rail is set on the central axis of the cylinder tube, and the guide rail is operatively connected to the output shaft of the rotary actuator. .

[Operation] As the output shaft of the rotary actuator rotates, the guide rail revolves around the cylinder tube around the central axis of the cylinder tube. Therefore, the follower unit, which is rotatably supported on the cylinder tube and slidably supported between the cylinder tube and the guide rail, rotates around the rotation axis of the cylinder tube.

[Example] Hereinafter, an example embodying the present invention will be described based on FIGS. 1 and 2.

1 is a cylinder tube made of a non-magnetic material, and end blocks 2 and 3 are fitted and fixed at both ends of the cylinder tube. The end block 2 is fitted and fixed to an end cover 4, and the end block 3 is fitted and fixed to an end cover 5. 'Both end covers 4.5 are fixedly attached to a fixed part (not shown), and the cylinder tube 1 is immovable.

A piston 6 is housed in the cylinder tube 1, and the piston 6 divides the inside of the cylinder tube 1 into a chamber S and a chamber S. The piston 6 includes a base shaft 7, a plurality of annular permanent magnets 8 fitted to the base shaft 7, a plurality of annular yokes 9 supported in parallel on both sides of each magnet 8, and the base shaft 7.
The permanent magnet 8 and the yoke 9 are fixed to the base shaft 7 by tightening the members 10 screwed onto both ends of the clamping member 10 . A buffer ring 11 is fixed to the outer end of the member IO, and a piston ring 12 and a seal ring 13 are fitted to the circumferential surface of the member IO.

Both end blocks 2, 3 are provided with passages 2a, 3a, and end covers 4, 5 are provided with air supply/exhaust ports 4a, 5.
a is provided so as to communicate with the passages 2a and 3a.

A rotary actuator 14 such as an air motor or an electric motor is mounted and fixed on one end cover 4, and is arranged so that the rotational axis β1 of its output shaft 14a coincides with the central axis 12 of the cylinder tube l. A bearing member 15 is attached and fixed to the other end cover 5, and a support shaft 16 is rotatably supported by the bearing member 15.

The rotational axis l of the support shaft 16 is set to coincide with the central axis 12.

The output shaft 14a and the support shaft 16 are provided with support arms 17. of the same length.
18 is fixed in the radial direction, and both support arms 17, 18 overlap each other when viewed in the direction of the axis 12 of the cylinder tube l.

A guide rail 1 is installed between the tips of both support arms 17 and 18.
9 is installed and fixed, and the guide rail 19 and cylinder tube l are arranged in a parallel relationship.

A table 20 is slidably supported between the cylinder tube 1 and the guide rail 19. The table 20 is made up of a block body 21 and holding plates 22 joined and fixed to both ends of the block body 21, and a follower body 23 is interposed between the block body 21 and the cylinder tube 1. Follower 2
3 consists of a pair of bearings 24, a permanent magnet 25 and a yoke 26 arranged in parallel between both bearings 24, and is slidably and rotatably fitted and supported on the cylinder tube 1. The permanent magnet 25 is in an attractive relationship with the permanent magnet 8 on the piston 6, and both have the same thickness, and the yokes 9 and 26 have the same thickness. Therefore, the permanent magnet 8 on the side of the piston 6 and the permanent magnet 25 on the side of the follower 23 overlap in a ratio of 1 to 1 as shown in the figure.

Note that the screw hole 20a on the table 20, which together with the follower 23 constitutes a follower unit, is for mounting a workpiece, a chuck, or the like on the table 20.

A pair of bearings 27 is interposed between the guide rail 19 and the block body 21, and the table 20 is supported by the bearings 24, 2.
7, it is slidably supported between the cylinder tube l and the guide rail 19.

When the piston 6 is at the stroke end as shown in FIG. 1, the following unit consisting of the table 20 and the follower 23 overlaps with the piston 6 at the stroke end due to the attractive force of the magnets 8 and 25.

When working fluid is supplied to the chamber S from the supply/exhaust port 4a in this state, the piston 6 moves toward the end block 3,
The follower 23 follows the movement of the piston 6. Therefore, the following unit is connected to the cylinder tube l and the guide rail 19.
Slide the top toward the end cover 5 side.

When the output shaft 14a of the rotary actuator 14 rotates, this rotational force is transmitted to the guide rail 19 via the support arm 17. The guide rail 19 is parallel to the central axis 12 of the cylinder tube 1 , and the pivot centers of the support arms 17 , 18 supporting the guide rail 19 coincide with the central axis 12 of the cylinder tube 1 . Further, a table 20 installed and supported between the guide rail 19 and the cylinder tube 1 is rotatable with respect to the cylinder tube 1. Therefore, the guide rail 19 revolves around the cylinder tube l, centering on the central axis 12 of the cylinder tube l.

FIG. 2 is a perspective view of the state shown in FIG. 1, and FIG. 3 shows a state in which the piston 6 has been moved toward the end cover 5 and the guide rail 19 has been rotated 90 degrees from this state. That is, if the movement of the piston 6 and the operation of the rotary actuator 14 are performed simultaneously, the table 20 will draw a spiral path. Of course, linear motion and rotational motion can also be performed separately.

The rotational movement of the table 20 that is driven in this manner is obtained by the revolution of the guide rail 19, and
, 5. The inertia of the revolved members is significantly reduced compared to the conventional method in which the entire rodless cylinder consisting of the end blocks 2 and 3, the cylinder tube 1, and the piston 6 is rotated. Therefore, the impact when stopping the rotation of the table 20 is small, and there is almost no influence of impact on members such as the workpiece and chuck mounted on the table 20. Also, since the cylinder side does not rotate, the impact on the cylinder is small. There is no need to provide a lock joint at the connection between the pipe and cylinder for supplying fluid, and the piping connection configuration can be simplified.

Of course, the present invention is not limited to the above-mentioned embodiment. For example, the guide rail may be supported by a support arm that rotates on the cylinder tube l instead of the support arm 18 of the above-mentioned embodiment, or the guide rail may be supported by a support arm that rotates on the cylinder tube l. An embodiment using two is also possible.

[Effects of the Invention] As described in detail above, in the present invention, the guide rail that slidably supports the follower unit together with the cylinder tube is made to revolve around the cylinder tube by the rotary actuator, so that the follower unit moves toward the cylinder side. It can rotate and slide without rotation, which suppresses the impact when stopping rotation, and it also has the excellent effect of being able to connect the working fluid supply pipe to the cylinder side without using a rotary joint. play.

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention; FIG. 1 is a longitudinal cross-sectional view, FIG. 2 is a perspective view showing a follow-up unit disposed on one stroke end side, and FIG. 3 is a follow-up unit. FIG. 3 is a perspective view showing a state in which the stroke end is placed on the other stroke end side by compound driving. Cylinder tube 1, piston 6, rotary actuator 14, guide rail 19, table 20 and follower 23 that constitute the follower unit, rotation axis as the center of revolution (lr, 13, center axis 12°)

Claims (1)

[Claims] 1 Piston (6) inside the cylinder tube (1) made of non-magnetic material and follower unit (2) outside the cylinder tube (1)
A rotary actuator (14) is assembled to a rodless cylinder that causes a follow-up operation based on magnetic attraction between the following unit (20, 23) and the piston (6) in the cylinder tube (1). is rotatably fitted and supported on the cylinder tube (1), and is slidably supported between the cylinder tube (1) and the guide rail (19), and the guide rail (19)
are arranged parallel to the cylinder tube (1) so as to be able to revolve around the cylinder tube (1), and the revolution center (l_1, l_2) of the guide rail (19) is aligned with the central axis (l_2) of the cylinder tube (1). A straight line characterized in that the guide rail (19) is set at the top and the guide rail (19) is operatively connected to the output shaft (14a) of the rotary actuator (14).
Rotary drive device.