Drive transmission device

Abstract

To provide a drive transmission device that has a simplified and compact configuration of a drive transmission mechanism from a single drive source.SOLUTION: When a drive motor 3 rotates forward, only a first cam 4 rotates together with a drive shaft 3a, the drive is transmitted to a first cam follower 8a, and an X-Y table 1 moves in an X-axis direction. When the drive motor 3 rotates backward, only a second cam 5 rotates together with the drive shaft 3a, the drive is transmitted to a second cam follower 9a, and the X-Y table 1 moves in a Y-axis direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a drive transmission device for use in, for example, medical equipment, industrial equipment, consumer equipment, and the like. [Background technology]

[0002] Industrial equipment such as machine tools use XY tables on which workpieces are placed. A known driving device for this XY table is an XY table driving device equipped with a saddle that moves in the X-axis direction on a base and a table that moves in the Y-axis direction on the saddle. This XY table driving mechanism is equipped with an X-axis driving mechanism that drives the saddle in the X-axis direction with respect to the base, and a Y-axis driving mechanism that drives the table in the Y-axis direction with respect to the saddle (Patent Document 1; JP 2012-139745 A).

[0003] Furthermore, in office automation equipment such as printers and copiers, one-way clutches are used as a mechanism for transmitting the rotation direction of a drive shaft from a drive source in only one direction (Patent Document 2; Japanese Utility Model Publication No. 7-14279). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-139745 A [Patent Document 2] Publication No. 7-14279 Summary of the Invention [Problem to be solved by the invention]

[0005] In the drive device for the XY table in the above-mentioned cited document 1, an X-axis drive mechanism and a Y-axis drive mechanism are provided, and drive control of a plurality of drive sources is performed. For this reason, the device configuration is complex, the number of parts is large, and the entire device is likely to become large in size. In addition, while a configuration in which the rotation direction of a drive shaft driven by a drive source is controlled by a single one-way clutch as in Cited Document 2 is known, there is no knowledge of a configuration in which the rotation direction is controlled by providing multiple one-way clutches on the same drive shaft. [Means for solving the problem]

[0006] The present invention has been made to solve these problems, and its object is to provide a drive transmission device that has a simplified and compact configuration of a drive transmission mechanism that receives drive power from a single drive source to move a moving body.

[0007] In order to achieve the above object, the present invention has the following configuration. the first cam follower is constantly pressed against the circumferential surface of the first cam and moves back and forth in the X-axis direction; the second cam follower is constantly pressed against the circumferential surface of the second cam and moves back and forth in the Y-axis direction; and a movable body connected to the first cam follower and the second cam follower is movable in the X-axis or Y-axis direction; and by switching between the forward and reverse rotation directions by the single drive source, the amount of rotation of the first cam and the second cam is controlled to move the movable body in the X-axis or Y-axis direction. According to the above configuration, by simply driving a single drive source in forward or reverse rotation, the first one-way clutch and the second one-way clutch regulate the rotation directions of the first cam and the second cam arranged on the same drive shaft, thereby moving the moving body in the X-axis or Y-axis direction. Therefore, a drive transmission device that moves the moving body in the X-axis or Y-axis direction can be provided with a compact and simple configuration.

[0008] A first sensor magnet may be integrally provided on the first cam, and a second sensor magnet may be integrally provided on the second cam, the amount of rotation of the first sensor magnet may be detected by a first angle sensor, and the amount of rotation of the second sensor magnet may be detected by a second angle sensor, and a control unit may perform rotation control of the drive source in accordance with the amount of rotation of the first cam and the second cam. As a result, for example, when the drive source rotates forward, only the first cam rotates together with the drive shaft, and the driving force is transmitted to the first cam follower, so that the moving body moves in the X-axis direction, and when the drive source rotates reversely, only the second cam rotates together with the drive shaft, and the driving force is transmitted to the second cam follower, so that the moving body moves in the Y-axis direction. At this time, the rotation of the drive source is controlled by the control unit in accordance with the rotation amounts of the first cam and the second cam detected by the first angle sensor and the second angle sensor, so that the upward process of the cam curves of the first cam and the second cam can be used to move the moving body in the XY directions with higher precision.

[0009] It is preferable that the first angle sensor is disposed within a rotational movement projected area of ​​the first cam, and the second angle sensor is disposed within a rotational movement projected area of ​​the second cam. This can further facilitate miniaturization and compactness of the drive transmission device. Effect of the Invention

[0010] It is possible to provide a drive transmission device for a moving body that has a simplified and compact configuration of a drive transmission mechanism that receives drive from a single drive source to move the moving body. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a plan view, left and right side views, a front view and a rear view of the drive transmission device. [Diagram 2] FIG. 2 is a plan view of the drive transmission device, a sectional view taken along the direction of an arrow AA, and a sectional view taken along the direction of an arrow BB. [Diagram 3] FIG. 3 is a front perspective view and a rear perspective view of the drive transmission device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drive transmission mechanism according to the present invention will be described below with reference to the accompanying drawings. In the following, a drive transmission device for driving an XY table as an example of a moving body will be described.

[0013] 1(A)-(E), the XY table 1 (moving body) can have a workpiece or sample mounted on its top surface, and has a housing-like case body 2 attached integrally to its back side. A drive motor 3 capable of rotating in both forward and reverse directions is attached integrally to the table-facing portion 2a of the case body 2 as an external attachment. A drive shaft 3a of the drive motor 3 is housed within the case body 2 and extends toward the XY table 1.

[0014] As shown in Fig. 2(A), (B), and (C), the first cam 4 and the second cam 5 are arranged in parallel in the axial direction from the tip side of the drive shaft 3a toward the drive motor 3. In Fig. 2(B) and (C), the first cam 4 is attached to the drive shaft 3a via a first one-way clutch 6. The second cam 5 is attached to the drive shaft 3a via a second one-way clutch 7. The first one-way clutch 6 transmits the drive to the first cam 4 only in the direction in which the drive shaft 3a rotates forward. The second one-way clutch 7 transmits the drive to the second cam 5 only in the direction in which the drive shaft 3a rotates backward. The rotation transmission directions of the first one-way clutch 6 and the second one-way clutch 7 may be interchanged. The first one-way clutch 6 and the second one-way clutch 7 may be mechanical clutches such as spring clutches or friction clutches, or electromagnetic clutches using electromagnets. The first cam 4 and the second cam 5 may have the same shape and cam curves or may have different shapes and cam curves.

[0015] As shown in Fig. 1 (A), (D), and (E), a first cam follower 8a is constantly pressed against the peripheral surface of the first cam 4 in the X-axis direction. A second cam follower 9a is constantly pressed against the peripheral surface of the second cam 5 in the Y-axis direction. The first cam follower 8a is supported by a first cam follower support portion 8b so as to be movable in the X-axis direction. The first cam follower support portion 8b is fixed to a table hanging portion 1a that is bent vertically downward from the top surface of the XY table 1, and is held by penetrating the case body 2. A first coil spring 8c is compressed from its natural length and assembled between the first cam follower support portion 8b and the first cam follower 8a so as to be expandable and contractible against the inner wall surface of the case body 2, and biases the first cam follower 8a so as to constantly press the first cam follower 8a against the peripheral surface of the first cam 4 in the X-axis direction.

[0016] 1(A), (B), and (C), the second cam follower 9a is supported by the second cam follower support portion 9b so as to be movable in the Y-axis direction. The second cam follower support portion 9b is fixed to a housing-like frame 10 arranged to surround the outer periphery of the case body 2 and is held by penetrating the case body 2. A second coil spring 9c is assembled between the second cam follower support portion 9b and the second cam follower 9a so as to be compressed from its natural length and to be expandable and contractible relative to the inner wall surface of the case body 2, and biases the second cam follower 9a so as to constantly press it against the peripheral surface of the second cam 5 in the Y-axis direction.

[0017] Therefore, by simply driving a single drive motor 3 in forward or reverse rotation, the rotational directions of the first cam 4 and the second cam 5 arranged on the same drive shaft 3a can be regulated via the first one-way clutch 6 or the second one-way clutch 7, thereby moving the XY table 1 in the X-axis or Y-axis direction.

[0018] As shown in Fig. 2(B)(C), a first sensor magnet 11 is integrally provided on the outer periphery of the first one-way clutch 6 assembled to the first cam 4. A second sensor magnet 12 is integrally provided on the outer periphery of the second one-way clutch 7 assembled to the second cam 5. As shown in Fig. 1(B)(C) and Fig. 2(B), a first angle sensor 13 is provided near the first sensor magnet 11, and the rotation amount of the first sensor magnet 11 is detected by the first angle sensor 13. A second angle sensor 14 is provided near the second sensor magnet 12, and the rotation amount of the second sensor magnet 12 is detected by the second angle sensor 14. Therefore, as shown in Fig. 3(A), the control unit 15 controls the rotation of the drive motor 3 according to the rotation amounts of the first cam 4 and the second cam 5 detected by the first angle sensor 13 and the second angle sensor 14. The first angle sensor 13 is disposed within the rotational movement projected area of ​​the first cam 4, and the second angle sensor 14 is disposed within the rotational movement projected area of ​​the second cam 5.

[0019] 3(A)(B), when the driving motor 3 rotates forward, the first cam 4 rotates following the first cam follower 8a, and the driving force is transmitted to the first cam follower 8a, so that the XY table 1 moves in the X-axis direction, and when the driving motor 3 rotates backward, the second cam 5 rotates following the first cam follower 8a, and the driving force is transmitted to the second cam follower 9a, so that the XY table 1 moves in the Y-axis direction. At this time, the control unit 15 controls the rotation of the driving motor 3 according to the rotation amounts of the first cam 4 and the second cam 5 detected by the first angle sensor 13 and the second angle sensor 14, so that the XY table 1 can be moved in the XY direction with higher precision by utilizing the ascending process of the cam curves of the first cam 4 and the second cam 5, respectively. Note that it is preferable that the control unit 15 controls the rotation within the range of the ascending process of the cam curves of the first cam 4 and the second cam 5. This is because, when the cam curve reaches the downward stroke, the first cam 4 and the second cam 5, coupled with the bias of the first coil spring 8c and the second coil spring 9c, may rotate more than the amount of rotation of the drive shaft 3a, and as a result, it may become impossible to accurately control the amount of movement of the XY table 1. In addition, the control unit 15 may be a controller within the apparatus or may be a controller outside the apparatus.

[0020] As described above, the drive motor 3, the first cam 4 and the second cam 5, the first one-way clutch 6 and the second one-way clutch 7, the first angle sensor 13 and the second angle sensor 14, the first cam follower 8a and the first cam follower support portion 8b, and the second cam follower 9a and the second cam follower support portion 9b are arranged within the projected area of ​​the XY table 1. This can facilitate miniaturization and compactness of the drive transmission device that moves the XY table 1 in the X and Y directions.

[0021] As described above, by simply driving the single drive motor 3 in forward or reverse rotation, the rotation directions of the first cam 4 and the second cam 5 mounted on the same drive shaft 3a are regulated via the first one-way clutch 6 and the second one-way clutch 7, and the XY table 1 can be moved in the X-axis or Y-axis direction. Therefore, a drive transmission device for moving the XY table 1 in the X-axis or Y-axis direction can be provided with a compact and simple configuration.

[0022] The drive transmission device that moves the above-mentioned XY table 1 in the X and Y directions is widely applicable to medical equipment, industrial equipment, and consumer equipment. For example, when applied to the sample table of an electron microscope, it is small and compact, and can be moved in the X and Y directions with high precision. [Explanation of symbols]

[0023] REFERENCE SIGNS LIST 1 XY table 1a table hanging portion 2 case body 2a table facing portion 3 drive motor 3a drive shaft 4 first cam 5 second cam 6 first one-way clutch 7 second one-way clutch 8a first cam follower 8b first cam follower support portion 8c first coil spring 9a second cam follower 9b second cam follower support portion 9c second coil spring 10 frame 11 first sensor magnet 12 second sensor magnet 13 first angle sensor 14 second angle sensor 15 control portion

Claims

1. A drive source capable of driving the motor in forward and reverse directions; a first cam and a second cam arranged in the axial direction of a drive shaft that is rotationally driven by the drive source; a first one-way clutch that transmits driving force to the first cam only in a direction in which the drive shaft rotates forward, and a second one-way clutch that transmits driving force to the second cam only in a direction in which the drive shaft rotates backward; a first cam follower that is constantly pressed against a peripheral surface of the first cam and moves back and forth in the X-axis direction; a second cam follower that is constantly pressed against a peripheral surface of the second cam and moves back and forth in a Y-axis direction; The second cam follower and a movable body movable in the X-axis and Y-axis directions in conjunction with the second cam follower, A drive transmission device characterized in that the amount of rotation of the first cam and the second cam is controlled by switching between forward and reverse rotation directions caused by the single drive source, thereby moving the moving body in the XY directions.

2. 2. The drive transmission device of claim 1, wherein a first sensor magnet is integrally provided on the first cam, a second sensor magnet is integrally provided on the second cam, the amount of rotation of the first sensor magnet is detected by a first angle sensor, the amount of rotation of the second sensor magnet is detected by a second angle sensor, and a control unit controls the rotation of the drive source in accordance with the amount of rotation of the first cam and the second cam.

3. 3. The driving power transmission device according to claim 2, wherein the first angle sensor is disposed within a rotational movement projected area of ​​the first cam, and the second angle sensor is disposed within a rotational movement projected area of ​​the second cam.

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