JP2828466B2 - Automatic pendulum type optical path compensation mechanism and pendulum suspension method for surveying instrument - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pendulum type automatic optical path compensation mechanism incorporated in a surveying instrument such as an automatic level.

[Problems to be solved by the prior art and the invention]

FIG. 19 shows a conventional automatic optical path compensating mechanism of this kind, in which a fixed frame 2a, which is a part of the fixed side frame 2, is provided with four suspension lines 4a.
The pendulum body 8 with the reflecting mirror 6 attached thereto is suspended, and a magnetic braking mechanism 10 is provided between the pendulum body 8 and the fixed plate 2b, which is a part of the fixed side frame 2. I have. The fixed frame 2a and the fixed plate 2b are integrated by a frame assembly (not shown) and housed and fixed in a casing such as an automatic level. Further, the four suspension lines 4 have a structure in which each of the suspension lines 4 is clamped between the respective suspension line clamping surfaces via the spacer 5 by tightening the fixing screw 3. The spacer 5 is provided to prevent the suspension line 4 from being bent or damaged when the suspension line 4 is fixed. The braking mechanism 10 includes a permanent magnet 12 on the fixed frame 2b side, and a braking plate 14 which is a conductor provided opposite to the magnet 12 at the upper end of the pendulum 8 and moves with the movement of the braking plate 14. As a result, an eddy current is generated by the electromagnetic induction action, so that the movement of the brake plate 14 is hindered. Reference numeral 16 denotes a balancer attached to the upper end of the brake plate 14.

However, in the above-mentioned conventional automatic optical path compensating mechanism, the suspension line 4
Requires 4 screws, 16 fixing screws 3 and 8 spacers 5. The number of parts is large, and the work of connecting the suspension wires 4 and suspending the pendulum 8 is troublesome, and is costly. There was a problem of becoming.

Particularly, in the conventional suspending operation of the pendulum body 8, the fixing frame 2a and the pendulum body 8 are fixedly arranged at predetermined positions in the vertical direction by a pendulum body suspending jig, and the suspending line 4 is attached to the suspending line holding surface. 4, the spacer 5 is pressed from above, the fixing screw 3 is screwed, and the suspension line 4 is held between the suspension line holding surfaces.
The troublesome work of pinching the suspension line at a total of eight places had to be performed.

The present invention has been made in view of the problems of the prior art,
It is an object of the present invention to provide a pendulum-type automatic optical path compensating mechanism in a surveying instrument having a small number of components and easy suspension line connection work, and a method of suspending a pendulum body with easy connection of a suspension line.

[Means for solving the problem]

In order to achieve the above object, in the pendulum type automatic optical path compensating mechanism of the surveying instrument according to claim (1), the measuring instrument opposing the fixed side frame fixed to the body casing of the surveying instrument in the front, rear, left and right directions in the optical axis direction. A pendulum body having a reflector attached thereto is suspended by four suspension lines, and a pendulum-type optical path automatic in a surveying instrument provided with a braking mechanism between the pendulum body and the fixed side frame body for suppressing swinging of the pendulum body. In the compensating mechanism, the suspension lines are constituted by two left and right band-shaped thin plate suspension wires in which two suspension lines facing each other in the longitudinal direction of the optical axis are integrated at the lower surface of the pendulum body. On the other hand, four holes are formed at predetermined intervals. On the other hand, an engaging projection that engages with the hole on the suspension wire side is formed on the fixed side frame and the pendulum body at the suspension wire sandwiching portion. , A screw hole is formed in this engagement protrusion Is to engage a hanging line side of the hole in the engaging projection is obtained by fixing screws through the washer so that pinching the screwed to hanging wire into the screw hole.

Further, in the pendulum type automatic optical path compensating mechanism of the surveying instrument according to claim (2), the reflecting mirror is formed by a total of four suspension lines facing the front and rear and right and left in the optical axis direction on the fixed side frame fixed to the body casing of the surveying instrument. In a pendulum-type automatic optical path compensation mechanism in a surveying instrument in which a pendulum body attached to is suspended and a braking mechanism that suppresses swinging of the pendulum body is provided between the pendulum body and the fixed-side frame body, The two suspension lines opposed to each other in the front-rear direction of the optical axis are constituted by two left and right strip-shaped suspension wires integrated at the lower surface of the pendulum body,
Four holes are formed at predetermined intervals in each strip-shaped thin plate suspension wire. On the other hand, the fixed side frame and the pendulum are formed of a thermoplastic resin molded body, and the fixed side frame and the pendulum are formed. In the suspension wire holding portion, an engagement projection that engages with the hole on the suspension wire side protrudes and is formed. It is designed to be pinched.

In the method for suspending a pendulum according to claim (3), the fixed side frame and the pendulum are arranged at a predetermined distance in the vertical direction, and a predetermined hole in which four holes for setting the pendulum length are formed. The two strip-shaped thin suspension wires having a length are wrapped around from below the pendulum body, and the holes at both ends of the suspension wire are engaged with the corresponding engagement projections of the fixed side frame, and then the central portion in the longitudinal direction of the suspension wire material Is pulled downward to engage another hole of the suspension wire with a corresponding engagement projection of the pendulum body, and then the peripheral edge of each hole of the suspension wire is clamped by the suspension wire clamping surface.

In the method for suspending a pendulum according to claim (4), the fixed side frame and the pendulum are arranged at a predetermined distance in the vertical direction, and a predetermined hole having four holes for setting the pendulum length is formed. The two strip-shaped thin suspension wires having a length are held in parallel in a V-shape having an opening angle equal to the opening angle of the suspension wire holding surface, and are lifted from directly below the pendulum body, and each hole of the suspension wire is fixed to the fixed side frame and After being simultaneously engaged with the corresponding engagement projections of the pendulum body, the fixed side frame body and the pendulum body are urged in a direction relatively vertically separated from each other. The peripheral portion is clamped.

[Action]

According to the inventions of claims (1) and (2), conventionally, four independent suspension wires and 16 fixing screws are required, whereas two suspension wires and eight fastening screws are used. And the number of parts is small. In addition, the holes at both ends of the suspension wire are respectively engaged with the engagement protrusions of the fixed side frame, and the other two holes are engaged with the engagement protrusions of the pendulum body. The length of the pendulum body is determined, and the work of connecting the suspension line becomes easy.

According to the invention of claim (2), since the suspension wire is clamped on the suspension wire clamping surface by heat treatment such as thermal caulking, the suspension wire can be connected without using any washers or fixing screws.

According to the invention of claim (3), if the suspension wire is pulled downward in a state where the holes at both end sides of the suspension wire that has turned below the pendulum body are engaged with the engagement protrusions of the fixed side frame body, Are engaged with the corresponding engagement projections of the pendulum body.

According to the invention of claim (4), since each hole of the suspension wire approaches a parallel state with respect to each suspension line holding surface, each hole of the suspension wire simultaneously engages with the corresponding engagement projection. I do. Then, the fixed frame and the pendulum are pulled in the direction in which the fixed frame and the pendulum are vertically separated from each other, so that the fixed frame and the pendulum are positioned at a distance between the holes of the suspension wire material corresponding to the pendulum length.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

1 to 6 show an embodiment of the present invention. FIG. 1 is a perspective view of a main part of a pendulum type automatic optical path compensating mechanism built in an automatic level, and FIG. FIG. 3 is a longitudinal sectional view of an essential part of an automatic optical path compensating mechanism, FIG. 4 is an enlarged sectional view of a suspension line holding portion, FIG. 5 is an enlarged exploded perspective view of the suspension line holding portion, and FIG. (a)-(c) is explanatory drawing explaining the mode that a fixed frame and a pendulum are connected with a suspension line.

In these figures, reference numeral 20 denotes a fixing plate which is screwed into an automatic-level lens barrel (not shown), and the pendulum body 24 is suspended by four suspension wires 40, and the pendulum body bottom part 24a is reflected by the pendulum body 24a. A reflecting mirror 25 whose surface faces up and down is mounted and fixed. The fixed plate 20 is integrated with a fixed frame 22 disposed below the fixed plate 20 by a frame assembly (not shown).

The pendulum body 24 has a gate-shaped column 26 formed therein.
Reference numeral 26 vertically penetrates the opening 23 of the fixed frame 22, and a rectangular plate-shaped braking plate 28, which is a conductor, is fixed to the upper end of the column by screwing. The upper edge 28a of the brake plate 28 is loosely fitted in the opening 21 formed in the fixed plate 20, and the balancer 30 is screwed to a male screw portion 28b formed to project from the upper edge 28a of the brake plate. I have. On one side of the brake plate 28, a permanent magnet 32 supported by the fixed plate 20 is provided so as to face the brake plate 28, and restrains the movement of the brake plate 28 to suppress the swing of the pendulum body 24. It is supposed to.

As shown in FIG. 2, the suspension wire 40 is provided with holes 42 at predetermined intervals in a strip-shaped metal sheet material 41 formed by etching.
(42a to 42d) are formed.

The lengths L ₁ and L ₃ between the holes 42a and 42b and between the holes 42c and 42d are the same length, and set the vertical distance between the fixed frame 22 and the pendulum body bottom 24a. Hole 42b and hole 42c distance L ₂ is made somewhat longer than the distance d between the suspended line clamping face of the pendulum body 24. As shown in FIG. 5, engagement protrusions 44 each having a size matching the hole 42 of the above-described suspension line 40 are formed on the suspension line sandwiching surfaces of the fixed frame 22 and the pendulum body bottom portion 24a, respectively. Engagement projection
A screw hole 45 is provided in an end face of the screw 44. And suspension line 40
By engaging the holes 42 with the engagement projections 44, the length of the suspension line 40, that is, the length of the pendulum of the pendulum body 24 is determined. Further, the fixed frame 22 and the pendulum body 24 are connected via the suspension wire 40 by screwing the periphery of the hole 42 of the suspension wire via the washer 46. As shown in FIGS. 4 and 5, the washer 46 is formed in a disk shape having a concave portion 46a into which the engaging protrusion 44 is fitted at one side edge, and the washer 46 is screwed with a fixing screw 48.
Presses the peripheral edge of the hole of the suspension line against the suspension line holding surface.

Next, an operation of connecting the fixed frame 22 and the pendulum body 24 via the suspension wire 40 will be described.

First, as shown in FIG. 6 (a), the fixed frame 22 and the pendulum bottom surface 24a are arranged at a predetermined distance in the vertical direction, and in this state, the two 22, 24a are fixed. Then, as shown in FIG. 6 (a), both ends of the suspension wire 40 are lifted from below the pendulum body bottom portion 24a, and the holes 42 on the end side are fixed to the fixing frame 22.
Is engaged with the engagement projection 44 of the first. This state is shown in FIG. Next, as shown by the arrow in FIG. 6 (b), when the central portion of the suspension wire is pulled downward, the engagement protrusion 44 formed on the pendulum body bottom portion 24a fits into the hole 42 of the suspension wire. And this suspension line
In a state where 40 is pulled downward, a washer 46 is arranged on an engagement protrusion 44 protruding from the hole 42 of the suspension wire, and a screw hole 45 of the engagement protrusion 44 is provided.
A fixing screw 48 is screwed into the hole to clamp the peripheral edge of the hole of the suspension line.

As described above, in the present embodiment, the holes formed in the
If the 42 is engaged with the engaging protrusion 44 formed on the fixed frame 22 and the pendulum body bottom portion 24a and the approximate center of the suspension wire is pulled, the hole 42 of the suspension wire can be easily engaged with the engagement protrusion 44. The suspension work of the pendulum body 24 becomes very easy.

In addition, half the number of fixing screws, which was conventionally required from 16, is reduced to eight, and the number of suspension lines, which is required from four, is reduced to two, so that the number of parts is small and the cost is low.

7 to 13 show a second embodiment of the present invention. FIG. 7 is a perspective view of a pendulum type automatic optical path adjusting mechanism according to a second embodiment of the present invention. ) Is a side view of the brake plate,
FIG. 8 is a perspective view of a suspension line for suspending the pendulum body, FIG. 9 is an enlarged sectional view of the suspension line clamping portion, FIG. 10 is an enlarged exploded perspective view of the suspension line clamping portion, and FIG. FIGS. 12 (a) to 12 (d) are perspective views showing the arrangement state, FIGS. 12 (a) to 12 (d) are explanatory views for explaining a state in which the fixed frame and the pendulum body are connected by a suspension line, and FIG. FIG.

The second embodiment differs from the first embodiment in the structure of the braking mechanism, the hanging wire holding portion and the hanging wire, and the other points are the same as those in the first embodiment. Therefore, only different portions will be described, and other portions will be denoted by the same reference numerals, and duplicate description thereof will be omitted.

In these figures, the brake plate
28 has a structure projecting upward, and a bracket 29 having a U-shaped cross section fixed to the fixing plate 20 surrounds the braking plate 28 from above. And inside the bracket 29,
A permanent magnet 32 is attached to face the brake plate 28. The upper surface wall of the bracket 29 is notched as shown by reference numeral 29a, and the position of the brake plate 28 can be confirmed from above through the notch 29a. A horizontally extending screw hole 28c is formed at an upper position of the braking plate 29, and a screw 28d as a balancer is screwed into the screw hole 28c.
The balance of the pendulum body 24A is adjusted by adjusting the screwing amount of 8d.

Reference numeral 40A is a suspension line for suspending the pendulum body 24A, and a long hole 42A extending in the direction in which the suspension line extends is formed in the suspension wire 41A constituting the suspension line 40A, between the outer peripheral portions 42a of the adjacent long holes 42A. Is set to a predetermined length (pendulum length) with high accuracy.

On the other hand, as shown in FIG. 10, the engagement projection 44A protrudingly formed on the hanging wire holding surface is also formed into an oval cross section, but the minor axis of the ellipse is shorter than the elongated hole 42A of the hanging wire. Although matching with the diameter, the major axis of the oval is shorter than the major axis of the long hole 42A of the suspension line, so that engagement with the long hole 42A can be performed smoothly. As shown by the imaginary line in FIG. 10, the suspension line 40A is sandwiched between the suspension line clamping surfaces in a state where the engagement protrusions 44A are in contact with the long hole peripheral portions 42a, and the pendulum length is constant (L ) Is managed.

Further, the washer 46A is formed with an elongated hole 46B for engaging with the projection, and is formed in a rectangular shape having the same size as the elongated hole forming surface area 41a of the suspension wire, thereby forming the elongated hole forming surface area 41a.
The whole a is to be clamped by the suspension line clamping surface. The washer 46A has a thickness substantially equal to the amount of protrusion of the engaging protrusion 44A, and when the washer 46A is disposed on the engaging protrusion 44A, as shown in FIG. The end face, which is the surface, is raised.

FIGS. 12 (a) and 13 show an outline of a device for automatically suspending a pendulum on a fixed frame in the automatic optical path compensating mechanism of the second embodiment. A hanging wire holder consisting of a pair of swing arms 82 that can be freely opened and closed in the direction of the arrow.
Can move up and down. At the upper end of the swing arm 82, a leaf spring 84 that clamps and supports the end of the suspension line is provided.
As shown in FIG. 12 (a), the hanging wire 40A is held in a V-shape. Reference numeral 86 indicates a suspension line for the swing arm 82.
The washer receiving portion is formed at a position corresponding to the position of the elongated hole 42A of the suspension wire 40A when supporting the 40A, and the washer 46A is stored here. Reference numeral 85 indicates a swing arm 82 that penetrates the washer housing 86.
The automatic screwdriver 90 engages with the hole 85 for screwing the fixing screw 48 into the hole 85 for disposing the fixing screw. Note that the swing arm 82 is positioned at 2
Each of them is swingable (opening / closing operation) integrally.

Next, the hanging wire suspension operation will be described with reference to FIGS.

First, as shown in FIG. 12 (a), the fixed frame 22 and the pendulum 24 are arranged at a predetermined distance in the vertical direction. Fixed frame
The pendulum body 22 and the pendulum body 24 are supported by separate members (not shown), and can move up and down with each other. And the fixed frame 22 and the pendulum
The swing arm 82 is opened so as to be equal to the angle θ formed by the suspension line holding surface of the 24, and the washer 46A is housed in the washer housing 86.
Next, the end of the suspension wire 40A is clamped by a leaf spring 84 to secure the suspension wire 40A.
Are supported in a V-shape as shown. And suspension wire holder
80 is raised in the direction of the arrow in FIG. Then, the suspension wire 40A approaches in parallel to the engagement protrusion 44A protrudingly formed on each suspension wire holding surface, and the elongated hole 42A simultaneously engages with the corresponding engagement protrusion 44A. Since the elongated hole 42A has an oval shape longer than the engagement protrusion 44A, the engagement between the elongated hole 42A and the engagement protrusion 44A is performed smoothly. The back side of the suspension wire 40A is a washer 46A.
Are provided, and the washer 46A also engages with the engagement protrusion 44A at the same time that the elongated hole 42A engages with the engagement protrusion 44A. This state is the 12th
This is shown in FIG. Next, as shown by an arrow in FIG. 12 (c), the fixing frame 22 is raised with respect to the pendulum body 24 in the fixed state, and the hanging wire 40A is pulled up and down by the engaging projections 44A (see FIG. 11). ), And in this state, the screw is fixed to four screw holes 45 (eight screw holes in total for two hanging wires) for one hanging wire 40A by the automatic screwdriver 90.
48 are screwed simultaneously, and the suspension wire 40A is connected to the fixed frame 22 and the pendulum 24. Then, as shown in FIG. 12 (d), the swing arm 82 is opened, and the hanging wire holder 80 is lowered.

As described above, in this embodiment, the connection of the suspension line 40A is automatically performed, so that the assembling process of the automatic compensation mechanism is significantly reduced.

14 to 18 show a third embodiment of the present invention. FIG. 14 is a perspective view of a main part of an automatic optical path compensating mechanism, FIG. 15 is a side view showing a fixed frame in cross section, and FIG. FIG. 16 is an enlarged cross-sectional view of the hanging wire holding portion, FIG. 17 is an enlarged exploded perspective view of the hanging wire holding portion, and FIG.
FIG. 18 is an explanatory diagram for explaining the operation of connecting the suspension line.

The pendulum body 54 shown in this embodiment is a synthetic resin integrally molded body in which the reflecting mirror 25 and the brake plate 28 are insert-molded. Further, the fixed plate 50 is also an integrated molded body of a synthetic resin in which the permanent magnet 32 is insert-molded. The fixing frame 52 is also a molded body of a synthetic resin, and an engaging protrusion 64 is formed on the fixing frame 52 and the pendulum body bottom surface portion 54a on the suspension line sandwiching surface.
In a state where the engagement protrusion 64 having an oblong cross section is engaged with the long hole 42A of A, the engagement protrusion 64 is caulked by, for example, heat fusion to hold the suspension line. FIG. 16 shows a state in which the periphery of the hole 42A of the suspension wire is crimped, and reference numeral 64a in the figure denotes a crimped portion.

Further, a boss 70 having an internal thread 72 formed on the inner peripheral surface is integrally formed with the upper edge of the brake plate support frame 55 formed on the upper edge of the portal column of the pendulum 54. A male screw 74 as a balancer is screwed to the female screw portion 72.

In order to suspend the pendulum 54 with the hanging wire 40A, the hanging wire 40A is moved below the fixed frame 52 using the hanging wire holder 80 as in FIGS. 12 (a) and 12 (b) in the second embodiment. Long hole 42A
Is engaged with the engagement protrusion 64. In this embodiment, since the washer and the fixing screw are unnecessary, the washer receiving portion and the screw disposing hole are not formed in the swing arm 82. Then, as shown in FIG. 18, when the engaging projection 64 is projected from the elongated hole 42A of the suspension line by the suspension line holder 80, the swing arms 82, 82 are opened, and the suspension line holder 80 is lowered, and as shown in FIG. With the use of no welding jig, the distal ends of the eight engaging projections 64 are simultaneously expanded to the periphery of the hole 42 by thermal caulking.

As described above, the third embodiment does not require any fastening screws, spacers, screw holes, and the like, and the number of parts is further reduced as compared with the above-described two embodiments.

In the prior art and the first and second embodiments, the braking plate 28
Is screwed to the upper end of the pendulum body (indicated by reference numeral 29 in FIG. 3 is a fastening screw), which requires formation of a screw hole, formation of a fastening projection, or fastening work by the fastening screw 29. In addition, it was necessary to attach the reflecting mirror 25 to the pendulum body bottom 24a. Furthermore, the external thread 28b and the female female thread 28c, which are the balancer attachment parts, need to be threaded, and the balancers 30, 28d need to be screwed here. On the other hand, in the third embodiment, the reflecting mirror 25 and the braking plate 28 are integrally formed with the pendulum 54 by insert molding, and the core forming the female screw portion 72 is insert-molded to form the balancer mounting portion. Since the boss 70 is integrally formed, the above-mentioned problem is eliminated.

Further, in the third embodiment, the pendulum 54 is described as a resin molded body in which the reflector 25 and the brake plate 28 are insert-molded. You may make it comprise with a resin molding.

In each of the above-described embodiments, the pendulum body has a structure in which the swing is suppressed by the magnetic braking mechanism. However, the present invention may be a braking mechanism in which the swing is suppressed by an air damper type mechanism.

〔The invention's effect〕

As is clear from the above description, the present invention has the following effects.

In the pendulum-type automatic optical path compensating mechanism of the surveying instrument according to claims (1) and (2), four separate independent suspension lines are conventionally required, but only two suspension lines are required.
Therefore, the number of parts may be small. In addition, if the holes of the suspension wire are respectively engaged with the engagement protrusions of the fixed frame and the pendulum body, the length of the suspension wire, that is, the length of the pendulum body is naturally determined, so that the operation of connecting the suspension wire becomes very easy.

In particular, according to the invention of claim (2), since the suspension wire is clamped to the suspension wire clamping surface by heat treatment such as heat caulking, the suspension wire can be connected without using any washer and fixing screw.
Suspension line connection work becomes extremely easy.

According to the invention of claim (3), if the hanging wire is engaged with the engaging projection, the hanging wire can be temporarily fixed, and furthermore, the pendulum length can be controlled by the position of the hole in the hanging wire. Connection work is easy and shortened.

According to the invention of claim (4), the work of suspending the pendulum body can be performed automatically, so that the assembly line of the pendulum-type automatic optical path compensation mechanism is simplified and the mass production of the pendulum-type automatic optical path compensation mechanism is realized. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a pendulum-type automatic optical path compensating mechanism according to a first embodiment incorporated in an automatic level, FIG. 2 is a perspective view of a suspension wire for suspending a pendulum body, and FIG. FIG. 4 is an enlarged cross-sectional view of the hanging wire holding portion, FIG. 5 is an enlarged perspective view of the hanging wire holding portion, and FIGS. 6 (a) to (c) hang the pendulum body with the hanging wire. FIG. 7 is a perspective view of a pendulum-type automatic optical path compensating mechanism according to a second embodiment. FIG. 7 (a) is a side view of a brake plate, and FIG. FIG. 9 is an enlarged cross-sectional view of the hanging wire holding portion, FIG. 10 is an enlarged exploded perspective view of the hanging wire holding portion, FIG. 11 is a perspective view showing a state where washers are arranged on the hanging wire holding portion, 12 (a) to 12 (d) are explanatory views for explaining a manner of connecting the fixed frame and the pendulum body with a suspension wire, FIG. 13 is an enlarged perspective view of a main part of the suspension wire holder, and FIG. Implementation of FIG. 15 is an exploded perspective view of an example of an automatic optical path compensating mechanism, FIG. 15 is a longitudinal sectional view thereof, FIG. 16 is an enlarged sectional view of a hanging wire holding section, FIG. 17 is an enlarged exploded perspective view of the hanging wire holding section, and FIG. Explanatory drawing explaining the operation of connecting the suspension line,
FIG. 19 is a perspective view of a conventional pendulum type automatic optical path compensation mechanism. 20, 50 ... fixed plate as fixed side frame, 22, 52 ... fixed frame as fixed side frame, 24 ... pendulum, 25 ... reflecting mirror as optical reflecting member, 28 ... braking plate , 32 ... permanent magnet, 40, 40A ...
... suspension line, 42 (42a to 42d), 42A ... holes formed in the suspension line, 44, 44A, 64 ... engagement projections, 45 ... screw holes, 46 ... washers, 48 ... fixing screws, 64a …… Crimping part.

Claims (4)

(57) [Claims] 1. A pendulum body having a reflecting mirror attached thereto is suspended by a total of four suspension lines facing the front, rear, left and right in the optical axis direction on a fixed frame fixed to a body casing of a surveying instrument. In a pendulum-type automatic optical path compensating mechanism of a surveying instrument provided with a braking mechanism for suppressing swinging of a pendulum body between the pendulum body and the fixed-side frame body, the suspending line includes two pendulums facing each other in the longitudinal direction of the optical axis. It is composed of two left and right strip-shaped hanging wires integrated at the lower body position, and each of the strip-shaped hanging wires has four holes formed at predetermined intervals.
On the other hand, the fixed side frame body and the pendulum body
An engaging projection that engages with the hole on the suspension wire side is formed to project, and a screw hole is formed in the engagement projection. The hole on the suspension line is engaged with the engagement projection, and a fastening screw is inserted through a washer. A pendulum-type automatic optical path compensation mechanism in a surveying instrument, characterized in that a suspension wire is clamped by screwing a suspension wire into a screw hole. 2. A pendulum with a reflecting mirror attached thereto is suspended by a total of four suspension lines facing the front and rear and right and left in the optical axis direction on a fixed frame fixed to the body casing of the surveying instrument. In a pendulum-type automatic optical path compensating mechanism of a surveying instrument provided with a braking mechanism for suppressing swinging of a pendulum body between the pendulum body and the fixed-side frame body, the suspending line includes two pendulums facing each other in the longitudinal direction of the optical axis. It is composed of two left and right strip-shaped hanging wires integrated at the lower body position, and each of the strip-shaped hanging wires has four holes formed at predetermined intervals.
On the other hand, the fixed-side frame and the pendulum are formed of a molded body of a thermoplastic resin, and the fixed-side frame and the pendulum body are provided with engaging projections that engage with the holes on the suspension wire side. A pendulum-type automatic optical path compensating mechanism in a surveying instrument, wherein a projecting portion is formed, and the hanging wire is sandwiched by heat treatment such as thermal caulking of the engaging projection engaged with the hole on the hanging wire side. 3. A fixed side frame and a pendulum body are arranged at a predetermined distance in the vertical direction, and two strip-shaped thin plate suspension wires of a predetermined length formed with four holes for setting the pendulum length. While wrapping around from below the body, the holes at both ends of the hanging wire are engaged with the corresponding engagement projections of the fixed side frame, and then the center of the hanging wire in the longitudinal direction is pulled downward to open another hole of the hanging wire. A method for suspending a pendulum in an automatic pendulum-type optical path compensating mechanism, wherein after engaging a corresponding engaging projection of a pendulum, a peripheral edge of each hole of the suspending wire is clamped to a suspension wire clamping surface. 4. A fixed-side frame body and a pendulum body are arranged at a predetermined distance in the vertical direction, and two strip-shaped thin plate suspension wires of a predetermined length formed with four holes for setting the pendulum length. Holding in parallel in a V-shape having an opening angle equal to the opening angle of the holding surface and raising the pendulum body from directly below, the respective holes of the suspension wire are simultaneously formed with the corresponding engagement protrusions of the fixed side frame and the pendulum body. After the engagement, the fixed side frame and the pendulum body are urged in a direction in which the fixed side frame body and the pendulum body are relatively separated from each other in the up-down direction, and under this urged state, the peripheral edge of the hole of the suspension wire is clamped. A method for suspending a pendulum in an automatic optical path compensation mechanism.