JPH0572567B2 - - Google Patents

Description

[Detailed Description of the Invention] <Field of Application of the Invention> This invention is applicable to fine-tuning the standard of an astronomical telescope with an accuracy of minutes to seconds, or tracking a specific star with an astronomical telescope with an accuracy of minutes to seconds. This invention relates to a precision rotation structure provided on an equatorial mount mount.

<Prior Art> Conventionally, as this type of precision rotation structure, a structure as shown in FIG. 5, a structure using a gear, and the like are known.

<Problems to be Solved by the Invention> However, in the case shown in FIG. Since it rotates by the linear motion of the top 2, a gap will occur between the arcuate motion trajectory A drawn by its tip and the linear motion trajectory B of the top 2. Therefore, it is necessary to provide the necessary "play" between the male thread of feed screw 1 and the female thread of piece 2 to absorb this gap, and as a result, the rotation of feed screw 1 and the movement of piece 2 must be The relationship lacks precision, and the rotating body 3 cannot rotate accurately.

In addition, for gears that use gears, the diameter of the gear should be made larger in order to fine-tune the standard with precision on the order of minutes or seconds, or to obtain tracking rotation with precision on the order of minutes or seconds. Alternatively, a complicated gear combination or deceleration mechanism must be installed, and as a result, the equatorial mount mount becomes heavier and larger, not to mention the cost. It can be fatal.

Therefore, in this invention, we provide a precision rotation structure for an equatorial mount mount that can perform precise fine adjustment of the standard, sufficiently achieve tracking with accuracy on the order of minutes or seconds, and that allows the entire structure to be compact. It is intended to.

<Means for Solving the Problems> The means for achieving the above object will be explained based on the drawings of the embodiment. A spherical joint 1 is provided at each end of the expandable body 11 by the mechanism.
3 and 14, the fixed body 10 is connected to one spherical joint 14, and the rotating body 12 rotatably attached to the other spherical joint 13 is connected via a rotation fulcrum 15, and the above-mentioned Between the extensible body 11, the fixed body 10, and the rotating body 12, both the above-mentioned spherical joints 1 are provided.
3, 14 and the rotation fulcrum 15, forming a link mechanism in which a rotating support is formed, and
The rotation body 12 is rotated by the expansion and contraction of the expansion and contraction body 11, and the expansion and contraction body 11 is a rod-shaped rod having a male screw 28 having a predetermined length L formed on its surface, and is a feeder rotated by a motor 22. screw 2
0 and a length L' corresponding to the male thread 28, and has a female threaded portion 29 formed on the inner surface thereof to be screwed into the male thread 28, and a thread 31 formed on the tapered surface of one end. a split female screw 24 having a slotted slot 30 and a collar 32 screwed onto the screw 31 to tighten the slotted slot 30;
The spherical joints 13 and 14 are connected to the elastic body 11.
support shafts 40 and 41 connected to both ends of the support shafts 40 and 41, and support shafts 40 and 41 that pass through each support shaft 40 and 41;
Spherical parts 13b, 14b are formed with through holes 13a, 14a having a larger diameter than 41, and have connecting parts 42, 42 to the fixed body 10 and the rotating body 12, respectively.
and a pair of spherical surfaces which are penetrated by the support shafts 40, 41 with the spherical parts 13b, 14b sandwiched therebetween, and are formed with concave spherical parts 47a, 47a which are in surface contact with the spherical parts 13b, 14b, respectively. The structure includes washers 47, 47, respectively.

<Function> That is, the fixed body 10, the elastic body 11, and the rotating body 12
Triangle C, which is a link mechanism rotating around both spherical joints 13, 14 and rotation fulcrum 15 formed between the two, becomes triangle D when one side of it, the telescopic body 11, is extended. , spherical joint 1
3, the rotating body 12 and the extensible body 11 are mutually
In addition, by means of the spherical joint 14, the extensible body 11 rotates with respect to the fixed body 10, and the rotating body 12
rotates around the rotation fulcrum 15. Therefore, the elastic body 11
There is no unreasonable force between the expansion and contraction of the elastic body 11 and the rotation of the rotation body 12, and the expansion and contraction of the expansion and contraction body 11 is converted into rotation of the rotation body 12 extremely smoothly and accurately. Moreover,
In order to tighten the slit 30 of the split female screw 24 screwed into the feed screw 20 with the collar 32, the male thread 28 of the feed screw 20 and the female thread 2 of the split female screw 24 are tightened.
9 are in close contact with each other, and the occurrence of "backlash" between the two is suppressed. Furthermore, in the spherical joints 13 and 14, the spherical portions 47a and 47a of the spherical washers 47 and 47 are connected to the spherical portions 13b and 14b,
Since 47a is in surface contact, play is less likely to occur in this portion as well. In this way, "stretchable body"
Even if a "feed screw mechanism" is used, "play" does not occur, so extremely precise rotation of the rotating body 12 can be obtained, and at the same time, the rotating structure can be simplified, and the entire structure can be made smaller and lighter. (See Figures 1 and 2).

In addition, in this specification, "link mechanism" means
This term is understood in a broad sense, with those shown in FIGS. 1 and 2 being representative examples.

<Example> Hereinafter, an example of a precision rotation structure of an equatorial mount mount according to the present invention will be described with reference to FIGS. 1 to 4. The precision rotation structure of this equatorial mount mount is mainly composed of an extendable body 11, a fixed body 10, and a rotating body 12.

Telescopic body As the telescopic body 11, a feed screw mechanism is used. That is, the bevel gear 21 provided at one end of the feed screw 20 meshes with the bevel gear 23 at the shaft end of the motor 22 arranged perpendicularly to the feed screw 20. motor 22
The rotation is transmitted to the feed screw 20, and the split female screw 24 screwed into the feed screw 20 is moved forward and backward, thereby
1 to expand and contract.

The feed screw 20 is rod-shaped, and has a male thread 28 of a predetermined length L over the entire surface except for the bearing receiving portion 25, flange portion 26, and gear receiving portion 27 provided at one end thereof.
is provided.

The split female screw 24 has a cylindrical shape with a length L' corresponding to the male screw 28, and has a female screw 29 on its inner surface.
is provided, and a slot 30 is provided on the tapered surface of one end thereof, and a screw 31 is provided at a portion corresponding to the slot 30. And this screw 31
"Play" between the male screw 28 and the female screw 29 is eliminated by screwing the buckle lock collar 32 into
(battery twist) is suppressed, and the expansion and contraction precision of the expansion and contraction body 11 is further improved.

33 in the figure is a gearbox, and the bevel gear 2
1 and 23 are stored, 34 is a retainer nut used to attach the bearing 35 to the bearing receiving part 25, and 36 is a cover that connects the feed screw 20 and the split female screw 24. It covers the joint.

Spherical joint joint At both ends of this expandable body 11, support shafts 40, 41 are provided.
a spherical joint 13 having a connecting portion 42 via;
14 are provided respectively. That is, in each spherical joint 13, 14, the spherical portion 13b,
Through holes 13a, 14a having a larger diameter than the support shafts 40, 41 are formed in the spherical portions 13b, 14b. 47,4
The support shafts 40 and 41 are passed through the spherical washers 47 and 47 with the spherical washers 47 and 47 sandwiched between the spherical parts 13b and 14b, respectively.
It is in a state where it is in face-to-face contact with the

The support shaft 40 is provided with screws 43 and 44 at both ends, and the screw 43 at one end connects to a fixing flange 4 that is screwed and fixed to the gearbox 33.
5 is screwed together. and fixing flange 45
A spherical joint 14 is rotatably provided via a spherical washer 47 between the end face of the support shaft 40 and a nut 46 screwed into a screw 44 at the other end of the support shaft 40.

The support shaft 41 also has screws 48 at both ends.
49 and a screw 48 at one end of this
A stopper flange 50 is provided connected to the screw 4 on the stopper flange 50 side.
8 is screwed into the female thread 29 of the split female thread 24, and the support shaft 41 is connected to the split female thread 24. A spherical joint 13 is connected via a spherical washer 47 between the nut 46 screwed onto the screw 49 at the other end of the support shaft 41 and the end surface of the stopper flange 50.
is rotatably provided.

Fixed body The fixed body 10 is a cylindrical body having a flange 51 at the upper end, and has a fixed arm 52 that integrally projects from the flange 51. The flange 51 includes a bearing 54 that pivotally supports the rotating body 12, which will be described later.
The fixed arm 52 has a protrusion 5 at its tip that connects to the connecting part 42 of the spherical joint 14.
3, and a clamping claw 58 for preventing rotation of the motor 22 main body is provided slightly below the tip.

Rotating body The rotating body 12 includes a rotating shaft 55 that is rotatably supported by the bearing 54 and serves as a rotating fulcrum 15, a substantially circular base 56 attached to the rotating shaft 55, and an integral structure from this base 56. It consists of a rotating arm 57 protruding from the top. A protrusion 53 is provided at the tip of the rotating arm 57 in the same way as the fixed arm 52 described above. The base 56 of this rotating body 12 has a sliding base 5.
9 is fixed, and the astronomical telescope 6 which is the rotating object is attached to this.
0 is loaded.

Connection Relationship between the Extensible Body, Fixed Body and Rotating Body Then, the fixed arm 52 and the rotating arm 57 are connected to the spherical joints 13 and 14 provided at both ends of the extensible body 11 as described above through their protrusions 53, respectively. , between the elastic body 11, the fixed body 10, and the rotating body 12, the fixed body 10, the elastic body 11, and the elastic body 1 are connected at both spherical joints 13, 14 and the pivot point 15.
1 and the rotary body 12, and the rotary body 12 and the fixed body 10 form a link mechanism that rotates in opposition to each other.

Next, the operating state of the precision rotation structure of this equatorial mount mount will be explained.

The rotation of the motor 22 is transmitted to the feed screw 20 by the bevel gears 21 and 23, and the split female screw 24 screwed into the feed screw 20 moves forward and backward, and the telescopic body 11
expands and contracts. The triangle C of the link mechanism, which has this expandable body 11 as one side, becomes a triangle D when the expandable body 11 is extended, but at that time, the spherical joint 1
3, the rotating body 12 and the extensible body 11 are mutually
Further, the extensible body 11 rotates with respect to the fixed body 10 by the spherical joint 14, and the rotating body 12 rotates about the rotation fulcrum 15. Therefore, no strain occurs between the expansion and contraction of the elastic body 11 and the rotation of the rotating body 12, and the expansion and contraction of the elastic body 11 is converted into rotation of the rotation body 12 extremely smoothly and accurately. Moreover, in order to tighten the slit 30 of the split female screw 24 screwed into the feed screw 20 with the collar 32, the male thread 28 of the feed screw 20 and the female thread part 2 of the split female screw 24 are tightened by the collar 32.
9 are in close contact with each other, and the occurrence of "backlash" between the two is suppressed. In addition, in the spherical joints 13 and 14, the spherical parts 47a and 47a of the spherical washers 47 and 47 are connected to the spherical parts 13b and 14b,
Since 47a is in surface contact, it is difficult for play to occur in this part, so the rotating body 1 is extremely precise.
This results in a rotation of 2. Due to this rotation, the astronomical telescope 60 mounted on the rotating body 12
Rotate to perform standard fine-tuning or precise tracking of a specific star.

Note that an equatorial mount mount usually has multiple rotating parts, and the "extensible body", "fixed body", "rotating body", etc. are shaped as appropriate depending on the part of each rotating part or the purpose of rotation. - structure, and the shape and structure of the above-mentioned embodiment are merely an example of such a case, and it goes without saying that the present invention is not limited to this. In short, "expandable body" and "fixed body"
The present invention is satisfied as long as a link mechanism consisting of a triangle whose one side expands and contracts is formed between the "rotating body" and the "extensible body".

<Effects of the Invention> As explained above, the present invention connects a fixed body and a rotary body to both ends of a telescoping body via a spherical joint, and a link mechanism is provided between the telescoping body, the fixed body, and the rotary body. We decided to use this link mechanism to control the rotation while converting the expansion and contraction of the extendable body into the rotation of the rotary body, so we could fine-tune the standards of astronomical telescopes with precision on the order of minutes or seconds, or It is possible to provide a precision rotation structure for an equatorial mount mount that allows a telescope to track a specific star with precision on the order of minutes or seconds, and is large enough to be used as a "portable type" often used by astronomical enthusiasts. It has an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the precision rotation structure of the equatorial mount mount according to the present invention, and FIG.
A schematic relationship diagram showing the link mechanism formed by the telescoping body, the fixed body, and the rotating body. Figure 3 is a schematic perspective view of the equatorial mount mount. Figure 4 is an exploded view of the telescoping body and the spherical joint provided thereon. FIG. 5 is a schematic perspective view showing a precision rotation structure of a conventional equatorial mount stand. 10... Fixed body, 11... Expandable body, 12... Rotating body, 13, 14... Ball joint joint, 15... Rotating fulcrum.

Claims (1)

[Scope of Claims] 1. Spherical joint joints 13 and 14 are provided at both ends of an expandable body 11 using a linear feed screw mechanism, and a fixed body 10 is connected to one spherical joint 14, and a fixed body 10 is connected to the other spherical joint 14. A rotating body 12 rotatably attached to the joint 13 is connected via a rotation fulcrum 15, and between the elastic body 11, the fixed body 10, and the rotating body 12, both the spherical joint joints 13, 14 and A link mechanism is formed to rotate around each of the rotational fulcrums 15, and the rotational body 12 is rotated by the expansion and contraction of the elastic body 11, wherein the expansion and contraction body 11 has a surface. A feed screw 20 has a rod shape and is rotated by a motor 22, and has a male thread 28 having a predetermined length L formed thereon; A split female screw having a slot 30 with a thread 31 formed on the tapered surface of one end, and a collar 32 screwed onto the thread 31 to tighten the slot 30. 24, wherein the spherical joints 13, 14 include: support shafts 40, 41 connected to both ends of the expandable body 11, and support shafts 40, 41 passing through the support shafts 40, 41; Also large diameter through hole 13
spherical portions 13b, 14b having connecting portions 42, 42 to the fixed body 10 and rotating body 12, respectively;
a pair of spherical washers 47, 47 each having a concave spherical surface portion 47a, 47a formed therein, which is passed through the support shafts 40, 41 in a state where the spherical surface portions 13b, 14b are in surface contact with the spherical surface portions 13b, 14b, respectively. The precision rotation structure of the equatorial mount stand is characterized by: