JPH0329754Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a rotating cursor that is provided opposite the display surface of a radar, direction finder, etc., and rotates a cursor board for reading the display contents on the display surface. It is related to the device.

"Prior art" This type of device, for example, as described in Utility Model Application Publication No. 52-144675, etc., has a cursor plate with a scale formed on its circumferential surface in the shape of a gear. There is a structure in which a shaped portion is driven by a small gear (hereinafter referred to as conventional structure 1).

In addition, as a structure for performing such rotational drive, the contact surfaces of the driving wheel and the driven wheel are provided with large wave-shaped unevenness and engaged, and the contact circumferential surface of the driving wheel or the driven wheel is covered with a deformable elastic membrane. A structure (hereinafter referred to as conventional structure 2) in which driving slip is eliminated by applying the following is disclosed in Japanese Utility Model Publication No. 11236/1983.

Furthermore, a structure (hereinafter referred to as
Conventional structure 3) is disclosed in Japanese Utility Model Publication No. 48-39970.

On the other hand, the cursor plate in the above-mentioned conventional structure 1 is made of, for example, a transparent synthetic resin plate with a thickness of about 3 mm, and a structure in which a driving wheel is provided that elastically sandwiches the periphery of this plate between two metal plates and brings them into frictional contact (hereinafter referred to as , Conventional Structure 4) has been attempted.

[The problem that the idea attempts to solve]

The cursor board cannot be provided with a shaft to hold its center in order not to disturb the display surface, so in a structure like conventional structure 1 above, the outer periphery of the cursor board is supported only by the teeth of the gear. Therefore, unless the tooth profile is a very accurate cycloid tooth profile, the meshing point of the gear will fluctuate minutely as the gear rotates, and this variation will cause the cursor line to move up, down, left, and right. This will have a negative effect on the accuracy of reading the display contents, so a support wheel to hold the outer periphery of the cursor board must be installed separately from the gear, or
The structure is such that the outer periphery of the same donut-shaped disk is supported by a support wheel, with the axis fixed over the cursor plate, which inevitably results in a complicated and expensive product. There is.

Furthermore, even if a configuration like the conventional structure 2 above is used for the drive structure of the cursor plate, it still requires a complicated and expensive structure such as providing large wave-shaped irregularities and elastic membranes on the contact surface between the cursor plate and the drive wheel. The disadvantage is that it cannot be helped.

Furthermore, even if a configuration such as the above conventional structure 3 is used for the cursor plate drive structure, a deformable body that causes the contact surface between the cursor plate and the drive wheel to undergo deformation similar to the protruding deformation of the belt described above is still required. Alternatively, a belt driven by such a belt must be placed around the circumferential surface of the cursor plate, resulting in a complicated and expensive structure.

On the other hand, in the conventional structure 4 described above, it is difficult to mold the transparent synthetic resin plate constituting the cursor plate to a constant thickness, and the frictional contact surface is scraped and damaged by the metal plate of the drive wheel. There are disadvantages such as easy failure.

For this reason, there is a problem in that it is desired to provide a device with a simple and inexpensive configuration that does not have these inconveniences.

[Means to solve the problem]

This invention is based on a rotary cursor device that is provided opposite the display surface of a radar or direction finder, etc., and that rotates a cursor board for reading the display contents of the display surface, and the circumferential surface is smooth. The cursor plate is made of a disk with a large diameter, and the contact surface and cursor are made of a non-irregular circumferential surface that rotates in contact with the circumferential surface of the cursor plate, which is provided at a position that divides the circumference of the cursor plate into three parts. The cursor board is rotated by installing three supporting wheels of small diameter with "brims" projecting on the front side and back side of the board, and the first supporting car of the above three supporting cars at a fixed position. A second support car is provided on a moving shaft that elastically pushes the cursor plate toward the inside of the cursor plate, and a third support car is fixed. The above-mentioned problem can be solved by providing a support wheel structure which is provided at the same position as the support wheel and also serves as a drive wheel for driving the rotation of the cursor plate by providing an O-ring for frictional contact on the contact surface. It is something.

"Example" Examples will be described below with reference to the drawings.

In the figure, a frame 11 is provided facing a display surface 12a of a display device 12 such as a cathode ray tube of a radar, and a circular opening 13 is provided facing the display surface 12a.
is opened in frame 11. In this embodiment, a fixed scale plate 1 is provided on the back side of the frame 11, that is, on the display 12 side so as to close the circular opening 13.
4 is installed. facing the scale plate 14,
That is, the cursor board 15 is rotatably disposed opposite the display surface 12a of the display 12. Cursor board 1
A driving wheel 16 is rotatably provided close to the cursor plate 15 in substantially the same plane as the cursor plate 15. In addition to the drive wheel 16, a receiver wheel 17 and a presser wheel 18 are provided on the cursor plate 1.
They are provided on the periphery of the cursor plate 15 at approximately equal angular intervals around the center of rotation, that is, at positions where the periphery of the cursor plate 15 is divided into three. These cars 16,
17 and 18 are rotatably attached to the frame 11.

The pressing wheel 18 presses the cursor plate 15 against the circumferential surfaces of the drive wheel 16 and the receiver wheel 17 toward the inside of the cursor plate 15 as shown in the figure. That is, as shown in FIGS. 1 and 3, frame 1
A holding shaft 19 is erected on the holding shaft 19, a rotating arm 21 is rotatably attached to the holding shaft 19, and a presser wheel 18 is rotatably attached to the rotating arm 21 substantially parallel to the cursor plate 15. A coil spring 22 is wound around the holding shaft 19, one end of the coil spring 22 is fixed to the frame 11, and the other end is attached to the rotating arm 2.
1, and the presser wheel 18 is elastically pressed against the circumferential surface of the cursor plate 15 by the spring force of the coil spring 22. A pair of collars 18a and 18b are provided on the peripheral edge of the presser wheel 18.
The peripheral edge of the cursor plate 15 is sandwiched and guided between 8a and 18b. As shown in FIG. 2, the receiving wheel 17 also has a ring-shaped groove 23 formed along its circumferential surface, and the peripheral edge of the cursor plate 15 is inserted into the groove 23 to guide and hold the cursor plate 15.

In order to hold the drive wheel 16, the support plate 16 is fixed between a pair of protrusions 24 and 25 provided on the frame 11, as shown in FIGS. 2 and 4, and is fixed on the support plate 26. The shaft 27 is erected. A shaft tube 28 is rotatably inserted onto the fixed shaft 27, and the disk-shaped drive wheel main body 16a is press-fitted onto the shaft tube 28. A pair of ribs 31, 3 are provided on the periphery of the drive wheel 16.
In the figure, both sides of the drive wheel main body 16a are sandwiched between two metal plates, and by making the diameter of these metal plates larger than the diameter of the main body 16a, a pair of Flams 31 and 32 are configured. A nut 33 is screwed into a screw formed in the shaft cylinder 28 to fix the main body 16a and the metal plate collars 31 and 32 to the shaft cylinder.

These are pressed against the collar of the shaft cylinder 28 with a nut 33, a gear 34 is formed on the outer periphery of the collar, a drive gear 35 is engaged with the gear 34, and the drive gear 35 is rotatably inserted into the frame 11. It is fixed to a shaft 36, and a knob 37 is attached to the shaft 36. Therefore, by rotating the knob 37, the drive wheel 16 is rotationally driven via the gears 35 and 34.

Between the ribs 31 and 32, the main body 1 of the drive wheel 16
An O-ring 38 is placed on the circumferential surface of the cursor plate 6a, and the O-ring 38 is brought into elastic contact with the circumferential surface of the cursor plate 15. In other words, the cursor plate 1 is
5 is elastically pressed by the O-ring 38. The peripheral edge of the cursor plate 15 is guided and held between the ribs 31 and 32.

To summarize the above structure, the cursor plate 15 is formed of a large diameter disk with a non-irregular surface, and the receiver wheel 17, presser wheel 18, and drive wheel 16 are
At a position where the circumferential surface of the cursor plate 15 is divided into three, a contact surface formed by a non-irregular circumferential surface that rotates in contact with the circumferential surface of the cursor plate 15 and a " This forms three supporting wheels of small diameter with flanges 18a, 18b.

Of these three support wheels, the first support wheel 17 is installed at a fixed position and follows the rotation of the cursor plate 15, and the presser wheel 18, which is the second support wheel, is a support wheel that follows the rotation of the cursor plate 15. A supporting wheel is provided on a moving shaft that elastically pushes toward the inside of the plate 15 to follow the cursor plate 15, and a driving wheel 16 serving as a third supporting wheel is provided at a fixed position and makes frictional contact with the contact surface. The cursor plate 15 is provided with an O-ring 38 to serve as a support wheel that also serves as a drive wheel for driving the rotation of the cursor plate 15.

With this structure, the elastic pushing force of the moving shaft of the second support wheel 18 is suppressed against the frictional contact between the circumferential surface of the cursor plate 15 and the drive wheel of the third support wheel 16. given and also "spit"
Since the O-ring 38 is prevented from coming off the circumferential surface of the cursor plate 15 by the O-rings 18a and 18b, the rotational drive does not slip or come off.
Since each contact surface with 7, 18, and 16 is a circumferential surface with no unevenness, rotation is smooth and the axis of the cursor plate 15 can be rotated without fluctuation, and the structure is improved. It also has the advantage of being lightweight and inexpensive, with only a support car and each contact surface being just a circumferential surface.

[Brief explanation of drawings]

The drawings show an embodiment, and FIG. 1 is a rear view of the device;
Figure 2 is a cross-sectional side view taken along line A-B-C in Figure 1;
The figure is a side view of the main part, and FIG. 4 is a cross-sectional side view of the main part. 11... Frame, 12a... Display surface, 15...
...Cursor board, 16...Drive wheel, 17...Receiver wheel, 18...Press wheel, 31, 32...Driving wheel collar, 37...Knob, 38...O ring.

Claims (1)

[Scope of Claim for Utility Model Registration] A rotating cursor device (hereinafter referred to as the device) that is provided opposite the display surface of a radar, direction finder, etc., and rotates a cursor board for reading the display contents of the display surface. a) the cursor plate formed of a large-diameter circular plate with a non-irregular surface; b) a cursor plate provided at a position dividing the circumferential surface of the cursor plate into three, and in contact with the circumferential surface of the cursor plate; c. three support wheels of small diameter having a contact surface made of a non-irregular circumferential surface that rotates with the cursor plate and a "flange" protruding from the front side and the back side of the cursor plate; c. A first supporting wheel is provided at a fixed position to follow the rotation of the cursor plate, and a moving shaft is provided to elastically push a second supporting car toward the inside of the cursor plate. A supporting wheel that is driven by rotation, and a third supporting wheel is provided at a fixed position, and an O-ring for frictional contact is provided on the contact surface to serve as a driving wheel that drives the rotation of the cursor plate. and a support car configuration.