JPH0322952B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating device that rotatably supports a scale plate or a cursor plate used in, for example, a radar indicator, a direction finder indicator, or the like.

"Prior Art" FIG. 6 shows a rotary support structure for a scale plate or cursor plate used in a conventional direction finder.

In the figure, 1 indicates a panel board, and 2 indicates a hood attached to this panel board 1. A cathode ray tube 3 is disposed on the back side of a panel board 1, and the display surface of the cathode ray tube 3 is viewed through an opening in a hood 2.

A rotating body such as a scale plate or a cursor plate, that is, a cursor plate 4 in this example, is inserted between the hood 2 and the cathode ray tube 3. As shown in FIG. 7, this cursor plate 4 is rotatably supported by three bearings 5A, 5B, and 5C.

In other words, the conventional rotating device can be constructed by the ring 7 attached to the back side of the cursor plate 4 and the bearings 5A, 5B, and 5C embedded in the fixed plate 6. The three bearings 5A, 5B, and 5C engage with grooves formed on the outer peripheral surface of the ring 7, and support the ring 7 and the cursor plate 4 at three points by the bearings 5A, 5B, and 5C.

8 indicates a ring-shaped large gear. A small gear 9 is meshed with the large gear 8, and by rotating the small gear 9 with a knob 11, the cursor plate 4 can be freely rotated.

In the case of a direction finder, the purpose of rotating the cursor plate 4 is to match the direction of the image displayed on the cathode ray tube 3 with the direction of the cursor 12 shown in FIG.
This is to measure the arrival direction of the radio waves by reading the direction No. 2 from the scale of the scale plate 13.

A direction finder installed on the ground has a scale plate 13 attached to a fixed plate 6 as shown in FIG. 6, but a direction finder installed on a moving object such as a ship has a cursor plate and The structure is such that both scale plates can be rotated.

"Problems to be Solved by the Invention" In any case, since the direction finder uses the relationship between the cursor and the scale to read the direction of arrival of radio waves, the positional relationship between the cursor 12 and the scale plate 13 may deviate depending on the rotational position. If this occurs, a reading error will occur corresponding to the amount of deviation.

Factors that cause the center position of the cursor plate 4 to shift in response to changes in the rotation angle position include the out-of-roundness of the outer peripheral surface of the ring 7, and the bearing 5.
It is possible that there is play between A, 5B, 5C and the ring 7.

A considerable amount of the roundness of the outer peripheral surface of the ring 7 can be removed by improving the machining accuracy. However, play between the bearings 5A, 5B, 5C and the ring 7 cannot be completely eliminated. This is because if the play between the bearings 5A, 5B, 5C and the ring 7 is completely eliminated, the bearings 5A, 5
Due to slight fluctuations in the roundness of the outer peripheral surfaces of B and 5C and the roundness of the outer peripheral surface of the ring 7, the operating feeling may become heavier or lighter depending on changes in the rotational angle position, which is a characteristic of the product. This is because the For this reason, conflicting conditions are required in that the position of the center of the cursor board 4 must be slightly changed while allowing slight play, and this has a major disadvantage in that it takes time for adjustment.

Also, when used for ships, bearing 5
A, 5B, and 5C also have the disadvantage of rapid corrosion and lack of durability.

"Means for Solving the Problems" The first invention of this application provides a rotating device that rotatably supports a transparent rotating plate on the front surface of a display.
A rotating ring formed to protrude from the plate surface of the rotating plate along the periphery of one side of the rotating plate, a convex ring formed on the inner wall surface of this rotating ring to protrude in the axial direction of the rotating ring, and the above-mentioned A fixed part is provided facing the inner wall surface of the rotating ring, a concave ring formed on the outer peripheral surface of the fixed part and engaged with a convex ring formed on the rotating ring, and a space between the convex ring and the concave ring. It is inserted into the concave ring, has a width slightly narrower than the width of the bottom surface of the concave ring, is formed of a smooth flexible resin material, and has a length slightly shorter than the circumference of the bottom surface of the concave ring. A flexible structure formed by a band-shaped body and a projecting piece having parallel surfaces on both sides of the band-shaped body, protruding in a direction perpendicular to the plane of the band-shaped body, and tapering away from the band-shaped body. A rotating device is constructed by a sliding body and a sliding body.

In the second invention of this application, in a rotating device that rotatably supports a transparent rotating plate on the front surface of a display device,
A rotating ring formed to protrude from the plate surface of the rotating plate along the periphery of one side of the rotating plate, a concave ring formed on the outer wall surface of this rotating ring, and a fixed part facing the outer wall surface of the rotating ring. A convex ring is formed on the inner circumferential surface of the fixed part and engages with a concave ring formed on the rotating ring, and a convex ring is inserted between the concave ring and the convex ring, and a convex ring is provided on the bottom surface of the concave ring. A strip having a width slightly narrower than the width, made of a smooth flexible resin material, and having a length slightly shorter than the circumference of the bottom surface of the concave ring, and a strip on both sides of the strip. and a flexible sliding body formed by a protruding piece having a surface parallel to the plane, protruding in a direction perpendicular to the surface of the strip, and tapering away from the strip. This is the configuration of the device.

According to this structure, the rotating body can be supported on the fixed part without any looseness due to the elasticity of the flexible sliding material. For this reason, it is possible to provide a rotating device in which the center of the rotating body does not fluctuate in response to changes in the rotational angular position.

"Example" FIG. 1 shows an example of the first invention of this application.
In FIG. 1, parts corresponding to those in FIG. 6 are designated by the same reference numerals. This example shows a case where the present invention is applied to a direction finder installed on the ground. That is, the scale plate 13 is attached to the fixed plate 6 as in the conventional example explained in FIG. 6, and a cursor plate is shown as an example of the rotating body.

The rotating device according to the first invention of this application is characterized in that a convex ring 14 is formed on the back side of the cursor plate 4, a concave ring 15 is formed on the fixed plate 6 side, and these convex rings 14 and concave ring 1
5 are engaged and a flexible sliding body 17 is inserted between them.

The detailed structures of the convex ring 14 and the concave ring 15 are shown in FIG. That is, the rotary ring 18 is attached to the back side of the cursor plate 4 with screws 18A, and the convex ring 14 is formed on the inner peripheral surface of the rotary ring 18 toward the axis.

On the other hand, 19 indicates a fixing ring. This fixing ring has a stepped annular notch 19A on one end surface,
The convex ring 14 covered with the flexible slip material 17 is received in this annular notch 19A, the scale plate 13 is covered from the opposite side of the flexible slip material 17, and the scale plate 13 is fixed with screws 21. Fix it to the ring 19. As a result, the convex ring 14 formed on the ring 18 is rotatably sandwiched and integrated by the annular notch 19A formed on the scale plate 13 and the fixed ring 19 via the flexible slip material 17.

The thus integrated rotating device is fixed to the fixing plate 6 by screwing the screw 23 into the screw hole 19B formed in the fixing ring 19.

The flexible sliding body 17 is made of a flexible material with a smooth surface and high wear resistance, such as Delrin. As shown in FIG. 2, its shape can be comprised of a flat strip 17A and numerous protrusions 17B planted along both sides of the strip 17A. The shape of the protruding piece 17B is the strip-like body 17.
For example, it has a tapered shape such as a triangle so that A can be freely bent to either the front side or the back side.

When covering the convex ring 14 with the flexible sliding body 17, the length of the flexible sliding body 17 may be selected and cut to be approximately equal to the circumferential length of the inner peripheral surface of the convex ring 14. . An appropriate state is such that when the flexible sliding body 17 is placed over the convex ring 14, there is a slight gap between both ends of the flexible sliding body 17.

The explanation returns to FIG. 1 again. In the embodiment shown in FIG. 1, a small pulley 24 is provided close to the cursor plate 4, and a timing belt 25 is applied to the outer circumferential surface of the small pulley 24 and the rotating ring 18, and the cursor plate 4 is rotated by the timing belt 25. This shows the case of a driving structure.

Note that 26 indicates a push button for operating the sense switch 27. By pressing the push button 26, the sense switch 27 is turned on and the sense determining circuit is activated. The push button 26 is attached to a shaft 28 that passes through the axis of the knob 11, and the sense switch 2
7 can be operated by pressing.

FIG. 4 shows an embodiment of the second invention of this application.
This example shows a case where the method is applied to a direction finder mounted on a moving body such as a ship.

The direction finder mounted on a moving body has a structure in which the scale plate 13 is also rotatably supported in order to maintain the correct azimuth relationship of the scale plate 13 even when the direction of the moving body changes. For this reason, in this embodiment, a flexible sliding body 17 is inserted in two places, one supporting the cursor plate 4 and the other supporting the scale plate 13, and the cursor plate 4 and the scale plate 13 are connected to the flexible sliding body. It is rotatably supported by 17.

Here, the structure of the part that supports the scale plate 13 is opposite to the first invention, in that a fixing part 19 is provided facing the outer wall surface of the rotating ring 29 protruding from the rotating scale plate 13. A convex ring is formed on the inner wall surface of the rotating ring, a concave ring is formed on the outer wall surface of the rotating ring, and a flexible sliding body 17 is provided between the convex ring and the concave ring. Sho 1
3A indicates a fixed scale plate provided on the outer periphery of the rotating scale plate 13. The rotating scale plate 13 is connected to the rotating ring 2
9 to the small pulley 31 through the timing belt 32
connected by. Pulley 33 to small pulley 31
The structure is such that the pulley 33 is connected to, for example, a synchro receiver (not particularly shown) driven by the output signal of the gyro, and the scale plate 13 can be set in the correct direction according to instructions from the gyro. There is. 34 indicates a switch for making this setting. This switch 34 is connected to pulleys 31 and 3.
The shaft 35 passed through the shaft center of the shaft 35 can be pressed by a push button 36, and the switch 34 is turned on and off by the push button 36, and a signal from the gyro is given to the synchro receiver as necessary. The synchronized receiver drives the pulley 33 and the scale plate 1
3 in the correct direction.

The direction setting push button 36 and the cursor plate drive knob 11 are provided in two locations as shown in FIG.
and the scale plate 13 can be rotated to predetermined positions separately.

"Operations and Effects" As explained in the above embodiment, according to the present invention, the flexible sliding body 17 is inserted between the rotating body and the fixed part, so that the rotating body, that is, the embodiment shown in FIG. In the example, the rotating ring 18 is supported by the fixed ring 19 without wobbling due to the elasticity of the flexible sliding body 17.

However, since the flexible sliding body 17 is made of a material with a small surface friction coefficient, it rotates smoothly. As a result, when the cursor plate 4 is rotated, the cursor plate 4 can be rotated without shifting its center position depending on the rotational angular position. Therefore, highly accurate direction measurement can be performed.

However, according to the first and second inventions of this application, the band-shaped flexible sliding body 17 is cut to match the circumferential lengths of the convex ring and the concave ring, and is placed over the convex ring, for example. It is easy to assemble as all you have to do is assemble it.

In particular, if the thickness of the band-shaped body 17A of the flexible sliding body 17 is matched with the gap between the convex ring and the concave ring, and the machining accuracy of the convex ring and the concave ring is further improved, the cursor can be displayed without any adjustment. It is possible to obtain a rotation mechanism that does not cause positional deviation.

In the embodiment shown in FIG. 4, since both the cursor plate 4 and the scale plate 13 are supported by the fixed part with the flexible sliding body 17 interposed, the cursor plate 4 and the scale plate 13 are supported without wobbling in this case as well. can do.
Therefore, the center positions of the cursor plate 4 and the scale plate 13 do not shift depending on the rotational position, and it is possible to feel that the cursor plate 4 and the scale plate 13 rotate smoothly.

In the above description, an example has been described in which the present invention is applied to a support mechanism for a cursor plate and a scale plate of a direction finder, but it can also be applied to a part that rotatably supports a cylindrical body, such as a lens barrel of a camera. It is easy to understand that it can be applied to other rotating mechanisms.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the first invention of this application, FIG. 2 is a perspective view illustrating the shape of a flexible sliding body used in this invention, and FIG. FIG. 4 is an exploded perspective view for explaining the structure of the main part of one invention, FIG. 4 is a sectional view for explaining an embodiment combining the first invention and second invention of this application, and FIG. FIG. 6 is a sectional view for explaining a conventional rotating device, and FIG. 7 is a front view for explaining the structure of a main part of the conventional rotating device. 1: Surface panel, 2: Hood, 3: Cathode ray tube,
4: Rotating body (cursor board), 6: Fixed plate, 14:
Convex ring, 15: Concave ring, 17: Flexible sliding body, 18: Rotating ring, 19: Fixed ring.

Claims (1)

[Scope of Claims] 1. A rotating device that rotatably supports a transparent rotating plate on the front surface of a display, B: a rotating device that is formed protruding from the surface of the rotating plate along the periphery of one side of the rotating plate; C. A convex ring formed on the inner wall surface of the rotary ring so as to protrude in the axial direction of the rotary ring; D. A fixing part is provided facing the inner wall surface of the rotary ring, and the fixing part is a concave ring formed on the outer peripheral surface and engaged with the convex ring; A strip-shaped body made of a smooth flexible resin material and having a length slightly shorter than the circumference of the bottom of the concave ring, and a surface parallel to each other on both sides of the strip-shaped body. A rotating device comprising: a flexible slippery member formed by a protruding piece that protrudes in a direction perpendicular to the strip and becomes tapered as it moves away from the strip; 2. A timing belt is placed around the outer periphery of the rotating ring according to claim 1, and the timing belt is meshed with a pinion provided on a shaft rotated by a manual knob, and the manual knob is rotated. A rotating device characterized in that the rotary plate according to scope 1 is configured to be able to rotate in any direction and by any amount. 3 A. A rotating device that rotatably supports a transparent rotating plate on the front surface of the display, B: a rotating ring formed to protrude from the surface of the rotating plate along the periphery of one side of the rotating plate, and C. A concave ring formed on the outer wall surface of the rotary ring, and a fixing portion facing the outer wall surface of the rotary ring; A ring E is inserted between the concave ring and the convex ring, has a width slightly narrower than the width of the bottom surface of the concave ring, is made of a smooth flexible resin material, and has a concave shape. A strip whose length is slightly shorter than the circumference of the bottom of the ring, and surfaces parallel to each other on both sides of the strip, protruding in a direction perpendicular to the surface of the strip and tapering away from the strip. A rotating device comprising: a flexible sliding body formed by a protruding piece having a shape; 4. A timing belt is placed around the outer periphery of the rotating ring according to claim 3, and the timing belt is meshed with a small gear provided on a shaft rotated by a manual knob, and the manual knob is rotated. A rotating device characterized in that the rotary plate according to scope 3 is configured to be able to rotate in any direction and by any amount.