JPH07190162A - Turning mechanism - Google Patents

Abstract

PURPOSE:To provide a compact and lightweight turning mechanism with a movable range of 360 deg. to 720 deg.. CONSTITUTION:A rotatable L-shape block 7 having step difference on one side and having two attitude holding holes at the bottom face, a block 8 for limiting the rotation range of the block 7, and a ball plunger for holding the attitude of the L-shape block 7 are fitted to a turning part. A fixed blocks 9, 10 different in height are fitted to a fixed part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is equipped with a television camera or the like and has a rotation range of 360 degrees or more and 720 degrees or less, which is used to direct the visual axis of the camera to an arbitrary direction by remote control. The present invention relates to a turning mechanism.

[0002]

2. Description of the Related Art FIG. 9 is a sectional view of a conventional turning mechanism, and FIG. 10 is a view showing its operation. In the figure, 1 is a television camera, 2 is a fixed part, 3 is a rotation axis, 4 is a motor,
Reference numerals 5 and 6 are bearings, 21 is a stationary block, 22 is a swivel block, 23 and 24 are fixed blocks, 25 is a bearing for floating blocks, and 26 is a base for floating blocks.

The conventional turning mechanism is constructed as described above,
For example, in FIG. 10, when the swivel shaft 3 is rotated in the A direction, the swivel block 22 does not hit the fixed block 24, but first hits the floating block 21 and rotates together with the floating block 21, so that the floating block 21 moves to the fixed block 23. The swivel shaft 3 rotates until it collides with. Similarly, when the swivel shaft 3 is rotated in the B direction,
Through the floating block 21, the swivel block 22 rotates until it collides with the fixed block 24, and limits the movable range of the swivel shaft 3.

[0004]

When attempting to mount the above-described turning mechanism on an aircraft, it is desirable to make the size and weight as small as possible because of restrictions on the mounting weight and mounting space. However, in the swing mechanism as described above, since the fixed block that stops the swing portion receives a large force, it is necessary to increase the diameter of the floating block bearing 25 for moving the arcuate floating block 21. Since there is a limit to downsizing and weight reduction, there is a problem that it is difficult to further reduce the size and weight. There is also a problem that the cost is high if a thin bearing is used to reduce the size and weight.

The present invention has been made to solve the above problems, and it is an object of the present invention to reduce the size and weight of a turning mechanism and to reduce the cost.

[0006]

According to another aspect of the present invention, there is provided a swivel mechanism having two posture-maintaining holes in a bottom surface of a swivel portion which has a step on one end surface and is concentric with a center of rotation. A rotatable L-shaped block having a block, a block for limiting the rotation range of the L-shaped block, and a ball blanker for holding the posture of the L-shaped block are attached, and the step of the L-shaped block is provided on the upper surface of the fixed portion. On the other hand, fixed blocks with different heights are attached.

Also, two rotatable L-shaped blocks having two holes for holding the posture on the bottom surface of the upper surface of the fixed portion concentric to the center of rotation and the rotation of the L-shaped blocks. Two blocks that limit the range and two ball plungers that hold the posture of the L-shaped block are attached, and the turning block is attached to the upper surface of the turning portion.

Further, the L-shaped block is provided with guide holes having constrictions at both ends so as to hold the guide pin at a position on a concentric circle with respect to the center of rotation, and is larger than the constriction of the guide hole and larger than the width of the guide hole. Is a guide pin with a small diameter.

Further, magnetic materials are provided at both ends of the L-shaped block and both ends of the block for limiting the rotation range of the L-shaped block.

[0010]

In the turning mechanism configured as described above, the fixed block switches the posture of the L-shaped block,
In the swing mechanism in the range of 360 degrees or more and 720 degrees or less, it has an effect of limiting the rotation range of the swing shaft.

Further, by forming a guide hole having a constriction in the L-shaped block, the rotation range of the L-shaped block is limited and the posture of the L-shaped block is maintained.

Further, both ends of the L-shaped block and both ends of the block for limiting the rotation range of the L-shaped block have a magnetic force, so that the posture of the L-shaped block is maintained.

[0013]

【Example】

Example 1. FIG. 1 is a sectional view showing an embodiment of the present invention.
FIG. 2 is an external view thereof, and FIGS. 3, 4 and 5 are diagrams showing its operation. In the figure, 1 to 6 are the same as the conventional example, 7 is a rotatable L-shaped block having a step on one side and two holes H for holding the posture, and 8 limits the rotation range of the L-shaped block. Block, 9 is a fixed block with a low spine,
10 is a fixed block having a spine higher than the fixed block 9, 1
Reference numeral 1 is a ball plunger for holding a posture of the L-shaped block by pressing a hard ball into a hole H for retaining the posture of the L-shaped block 7 with a spring, 27 is a hard ball inside the ball plunger, 28
Is a spring for pressing the hard ball.

In the turning mechanism constructed as described above, when the turning shaft 3 is rotated in the direction A in FIG.
The L-shaped block 7 is rotated by the ball plunger 11 while maintaining its posture with respect to the turning shaft 3. At this time, L
The fixed block 9 has a low protrusion on the fixed side of the character block.
Since it has a step so as not to collide with, it passes over the fixed block 9 and collides with the fixed block 10 having a high spine. Since the L-shaped block 7 is restricted from rotating clockwise by the block 8, the rotation of the revolving unit 3 is stopped. Similarly, when the swivel shaft 3 is rotated in the B direction, the L-shaped block 7 passes over the fixed block 9, collides with the fixed block 10, and continues rotating while changing its posture in the counterclockwise direction. The new posture of the L-shaped block 7 is held by the ball plunger 11. At this time, since the protruding portion of the L-shaped block 7 has no step, it collides with the fixed pin 8 having a low spine and the rotation shaft 3 stops rotating.

Example 2. In the first embodiment described above, the L-shaped block 7 is attached to the swivel portion, so that the L-shaped block 7 is 360 degrees or more.
Although a turning mechanism of 20 degrees or less is realized, the same purpose can be achieved by disposing two L-shaped blocks 12 and 13 having no step on the fixed side. That is, when the turning portion 3 is rotated in the direction A in FIG. 5, after changing the posture of the L-shaped block 12,
The rotation of the revolving part is stopped by the L-shaped block 13. Similarly, when the turning portion 3 is rotated in the B direction, the postures of the L-shaped blocks 12 and 13 are changed, and then the rotation of the turning portion is stopped by the L-shaped block 12.

Embodiment 3. In the first and second embodiments, the block 8 and the ball plunger 11 are used to limit the range of rotational movement of the L-shaped block and maintain the posture, but in the present embodiment, as shown in FIG. The same operation is realized by providing the L-shaped block 17 and the guide pin 18 each having a guide hole with a constriction at both ends. That is, the guide hole limits the rotation range of the L-shaped block, and the constriction of the guide hole holds the guide pin until a force of a certain magnitude or more is applied. Therefore, the posture of the L-shaped block can be maintained. .

Embodiment 4. In the first and second embodiments, the block 8 and the ball plunger 11 are used to limit the range of the rotational movement of the L-shaped block and maintain the posture, but in the present embodiment, the shaded portion in FIG. As shown, the range of rotational movement of the L-shaped block is limited by the blocks 19 by providing magnetic bodies at both ends of the L-shaped block 19 and both ends of the block 20 that limits the rotation of the L-shaped block.
The magnetic force can hold the posture of the L-shaped block.

[0018]

Since the present invention is constructed as described above, it has the following effects.

In a swivel mechanism having a movable range of 360 degrees or more and 720 degrees or less, the movable range can be limited without using a bearing, so that the size and weight can be reduced, the friction torque can be reduced, and the cost can be reduced. is there.

Further, according to the construction in which the L-shaped block is attached to the fixed portion side, only one turning block is attached to the turning portion, which has the effect of reducing the weight of the turning portion.

Further, according to the construction in which the guide hole having the constriction is formed in the L-shaped block, it is not necessary to use the ball plunger, so that the number of parts can be reduced and the reliability is enhanced.

Further, according to the structure in which the magnetic bodies are provided at both ends of the L-shaped block and both ends of the block for restricting the movement of the L-shaped block, it is not necessary to use the ball plunger, so that the L-shaped block is slightly oriented. Since the posture is maintained by the magnetic force even if the block is kept away from the block, the reliability is improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a turning mechanism showing a first embodiment of the present invention.

FIG. 2 is an external view of an L-shaped block showing the first embodiment of the present invention.

FIG. 3 is a diagram showing an operation of the first embodiment of the present invention.

FIG. 4 is a diagram showing a posture holding operation of the L-shaped block according to the first embodiment of the present invention.

FIG. 5 is a sectional view of the ball plunger according to the first embodiment of the present invention.

FIG. 6 is a diagram showing an operation of the second embodiment of the present invention.

FIG. 7 is an external view of an L-shaped block showing a third embodiment of the present invention.

FIG. 8 is an external view of an L-shaped block showing a fourth embodiment of the present invention.

FIG. 9 is a cross-sectional view of a conventional turning mechanism.

FIG. 10 is a diagram showing an operation of a conventional turning mechanism.

[Explanation of symbols]

 1 TV camera 2 fixed part 3 turning part 4 motor 5 bearing 6 bearing 7 L-shaped block 8 block 9 fixed block 10 fixed block 11 ball plunger 12 stepless L-shaped block 13 stepless L-shaped block 14 block 15 block 16 Swivel block 17 L-shaped block with guide hole 18 Guide pin 19 L-shaped block 20 block 21 Floating block 22 Swivel block 23 Fixed block 24 Fixed block 25 Floating block bearing 26 Floating block base 27 Hard ball 28 Spring 29 Magnetic material

Claims (4)

[Claims] 1. A swivel mechanism in which a swivel shaft supported by a fixed portion via a bearing is driven by a motor, and the swivel shaft is provided on the upper surface of the swivel shaft and has a step on one end surface thereof, which is concentric with the center of rotation. A rotatable L-shaped block having two holes for holding the posture at the bottom of the position, a block provided on the upper surface of the swivel shaft to limit the rotation range of the L-shaped block, and the swivel. A ball plunger provided on the shaft upper surface portion for holding the attitude of the L-shaped block by pressing a hard ball into the attitude holding hole of the L-shaped block with a spring, and a ball plunger provided on the fixed portion, from the upper surface of the fixed portion. The height of each is larger than the step of the L-shaped block,
A swivel mechanism comprising a block arranged so as to be small. 2. A swivel mechanism in which a swivel shaft supported via a bearing of a fixed part is driven by a motor, and two swivel shafts are provided on the upper surface of the fixed part and located on a bottom surface part concentric with the center of rotation. 2 rotatable L-shaped blocks having holes for holding postures, 2 blocks provided on the upper surface of the fixed portion to limit the rotation range of the L-shaped block, and the upper surface of the fixed portion. 2. A turning mechanism comprising: two ball plungers provided in a portion for holding the posture of the L-shaped block; and a turning block arranged on an upper surface of the turning shaft. 3. A guide hole having a constriction is provided at a position concentric with the center of rotation of the L-shaped block, and a guide pin having a diameter larger than the constriction of the guide hole and smaller than the width of the guide hole is arranged. The swivel mechanism according to claim 1 or 2, characterized in that. 4. The turning mechanism according to claim 1, wherein magnetic bodies are provided at both ends of the L-shaped block and at both ends of the block that limits the rotation range of the L-shaped block.