JP2514977Y2 - Course setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to a course setting device used for an autopilot device or the like in a ship.

(B) Conventional Technology Conventionally, when an autopilot device is provided together with a gyrocompass, a repeater compass that receives a signal from a master compass and indicates a direction is also used as a course setting device.

FIG. 4 shows an example of the course setting device. In FIG. 4, the scale plate 1 is also called a repeater card, and scales and values in all directions are described. The scale plate 1 is attached to the base 3 via a differential shaft 4 and a bearing 12. The pointer 2 indicates a new heading according to the positional relationship with the scale plate 1. A clutch 7 is provided on the rotating shaft of the pointer 2. A knob 5 is attached to the front glass 10 via a coil spring 11. The knob 5 is provided with a clutch 6 facing the clutch 7, and when the knob 5 is pressed, the clutches 6-7 are connected to each other, and the pointer 2 can be rotated in that state. A stepping motor 16 is attached to a predetermined position of the base 3, and a pulley 14 is provided on its rotation shaft. A pulley 13 is provided on the outer peripheral shaft of the differential shaft 4, and a belt 15 is stretched between the pulley 13 and the pulley 14 on the stepping motor 16 side. A rotary encoder 9 for detecting the rotation angle of the central shaft 8 of the differential shaft 4 is further attached to the base 3. Since the central shaft 8 of the differential shaft is connected to the clutch 7 and the pointer 2, the rotary encoder 9 can detect the rotation angle of the pointer 2 by operating the knob 5.

The stepping motor 16 shown in FIG. 4 is usually driven by a signal from the control circuit of the gyro compass, and keeps the indication on the scale plate 1 always the same as the indication direction of the master compass. When changing the needle with the auto pilot device,
The pointer 2 is set in a predetermined direction by operating the knob 5. As a result, the rotary encoder 9 detects the angle between the current heading and the new heading. The autopilot device will perform automatic steering based on the output signal of the rotary encoder 9.

(C) Problems to be Solved by the Invention However, in such a conventional course setting device,
When setting the course, the knob 5 has to be rotated while being pressed, and the operability is not necessarily good. Of course, if the knob 5 is directly connected to the rotary shaft of the pointer 2, it is not necessary to press the knob, but there is a risk that the pointer will rotate if the knob is inadvertently touched. Further, since the knob 5 is present as a protrusion in the central portion for displaying the heading display and the new heading display, the visibility of the current heading and the new heading is not necessarily good. If the knob 5 is downsized, the above problem is solved, but the operability is significantly reduced.

In addition, a stepping motor to rotate the scale plate and a rotational force transmission mechanism such as a pulley and a belt or a gear that rotates the rotary shaft of the scale plate are required, and it is difficult to downsize the entire system because the mechanism is complicated. Met.

An object of the present invention is to eliminate the above problem by eliminating a knob for rotating a pointer, attaching a stepping motor to a base, and eliminating a rotational force transmission mechanism between the stepping motor and a rotary shaft of a scale plate. To provide a setter.

(D) Means for Solving the Problems The course setting device of the present invention is a rotary force transmission mechanism for rotating the pointer together with the scale plate by driving the scale plate side, and rotating only the pointer by driving the scale side, and a fixed body. In a course setting device equipped with a rotation angle detector for detecting the rotation angle of a pointer, a first ultrasonic motor for rotating a scale plate is provided between a fixed body and the scale plate, and a second ultrasonic wave for rotating a pointer is provided. A motor is provided between the scale plate and the pointer.

(E) Action In the course setting device of the present invention, since the first ultrasonic motor is provided between the fixed body and the scale plate, the scale plate is rotated by the drive of the first ultrasonic motor. At this time, the rotating force transmitting mechanism causes the pointer to rotate together with the scale plate.
Further, since the second ultrasonic motor is provided between the scale plate and the pointer, the pointer is rotated relative to the scale plate by driving the second ultrasonic motor. At this time, only the pointer rotates due to the action of the torque transmission mechanism. Then, the rotation angle of the pointer with respect to the fixed body is detected by the rotation angle detector. That is, the second ultrasonic motor corresponds to the knob in the conventional course setting device, and the first ultrasonic motor corresponds to the conventional stepping motor and its rotational force transmitting mechanism. By providing the second ultrasonic motor between the scale plate and the pointer in this way, large protrusions from the front glass surface are eliminated, and the visibility of the scale plate and the pointer is improved. Further, since the first ultrasonic motor is provided between the fixed body and the scale plate, the stepping motor is not attached to the fixed body (base) and the rotational force transmission mechanism between the rotary shaft of the scale plate and the stepping motor is unnecessary. . Since each of the first and second ultrasonic motors can be made extremely thin, the entire device can be easily thinned. Further, since the second ultrasonic motor is driven by an electric signal from the outside, it is possible to separate the display unit and the operation unit of the course setting device, so that each can be installed at a position according to the purpose. Become.

(F) Embodiment The cross-sectional structure of the course setting device, which is an embodiment of the present invention,
Shown in the figure. In FIG. 1, the same parts as those in FIG. 4 are designated by the same reference numerals. In FIG. 1, a bearing 12 for rotatably supporting a differential shaft 4 and a rotary encoder 9 are fixed to a base 3. A scale plate 1 is attached to the outer peripheral shaft of the differential shaft 4, and a pointer 2 is attached to the central shaft 8 of the differential shaft 4. A vibrating body 18a is provided in a ring shape on the base 3 at a position facing the back surface of the scale plate 1, and a moving body 18b is formed in a ring shape on the back surface of the scale plate 1 so as to face the vibrating body 18a. . The vibrating body 18a and the moving body 18b constitute a first ultrasonic motor. On the other hand, a ring-shaped vibrating body 17a is formed on the upper surface of the scale plate 1, and a ring-shaped moving body 17b is formed on the back surface of the pointer 2 so as to face the vibrating body 17a. The vibrating body 17a and the moving body 17b form a second ultrasonic motor.

In the above structure, the vibrator 18a is usually driven by a signal from the control circuit of the gyro compass, and a propulsive force is applied to the moving body 18b by a signal of its traveling wave. As a result, the scale plate 1 rotates, and the pointer 2 also rotates together with the scale plate 1 via the differential shaft 4. When setting a course using this course setter, the vibrating body 17 is operated by operating the operation section described later.
A is driven, and a propulsive force is applied to the moving body 17b by the signal of the traveling wave. As a result, the moving body 17b and the pointer 2 to which it is attached rotate. Since the moving body 17b and the pointer 2 are attached to the central axis 8 of the differential shaft 4, only the pointer 2 rotates while the scale plate 1 remains stationary due to the rotation of the moving body 17b, and the rotation angle is determined by the rotary encoder 9. To be detected.

Next, the configuration and operation of the control unit using the above-described course setting device will be described with reference to FIGS. 2 and 3. FIG. 2 is a block diagram of the control unit. Here, the scale plate rotation control unit controls the rotation angle of the ultrasonic motor 18 based on the output signal of the rotary encoder provided in the gyro compass. The autopilot controller controls the steering device based on the respective signals from the rotary encoder 9 and the follow-up transmitter to automatically steer the set course as the heading. Further, in the figure, reference numeral 19 denotes an operation unit, and the pointer rotation control unit drives the ultrasonic motor 17 according to the key operation of the operation unit 19. For example, when the variable needle key is operated, the surface rudder key and the steering key become effective, and the pointer is rotated in the corresponding direction according to the number of times of pressing the surface rudder key and the steering key.

3 (A) to 3 (C) show the display state by the scale plate and the pointer. For example, in the state shown in FIG. 9A, it indicates that the bow direction is 30 degrees north latitude and that the set course matches the current bow direction. If the pointer is rotated from this state so that the pointer indicates 50 degrees north latitude as shown in FIG.
The angle of rotation is detected, and the autopilot control unit automatically steers (changes the needle) so that the bow direction is 50 degrees north.
As the needle changes, the pointer rotates together with the scale plate as shown in FIG. 7C, and when the pointer coincides with the base line, it stops and goes straight.

(G) Effect of the Invention According to this invention, it is not necessary to provide a knob for rotating the pointer on the upper surface of the course setting device, and the visibility of the scale plate and the pointer is improved. Further, since the driving means for the scale plate as well as the pointer drive means is constituted by the ultrasonic motor, the conventional stepping motor for rotating the scale plate and the complicated rotational force transmission mechanism such as the pulley, the belt or the gear are unnecessary. Moreover, the ultrasonic motor can be made extremely thin, and the course setting device as a whole can be miniaturized. Further, since the operation unit for rotating the pointer can be separated from the display unit, it becomes possible to install the display unit and the operation unit at optimum positions.

[Brief description of drawings]

FIG. 1 is a diagram showing a sectional structure of a course setting device according to an embodiment of the present invention. FIG. 2 is a block diagram of a control unit of the course setting device, and FIG. 3 is a display example of the course setting device. It is a figure.
FIG. 4 is a diagram showing the structure of a conventional course setting device. 1 ... Scale plate, 2 ... Pointer, 3 ... Base, 4 ... Differential axis, 9 ... Rotary encoder, 17 ... Second ultrasonic motor, 18 ... First ultrasonic motor, 17a , 18a ... Vibrator, 17b, 18b ... moving body.

Claims (1)

(57) [Scope of utility model registration request] 1. A rotating force transmission mechanism for rotating a pointer together with the scale plate by driving the scale plate side and rotating only the pointer by driving the scale side, and a rotation angle detector for detecting a rotation angle of the pointer with respect to a fixed body. In the course setting device provided, the first ultrasonic motor for rotating the scale plate is provided between the fixed body and the scale plate, and the second ultrasonic motor for rotating the pointer is provided between the scale plate and the pointer. And the course setter.