JP3338129B2 - Angle angle adjustment device for endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle adjusting device for an endoscope which regulates an operation amount of a bending operation mechanism for bending an angle portion of an insertion portion of the endoscope.

[0002]

2. Description of the Related Art Conventionally, a light guide for illumination, a cord for guiding an image, an operation wire for bending operation, a forceps for sampling, and the like are provided inside an insertion portion of an endoscope inserted into a subject. A forceps tube or the like through which the operation wire is inserted is inserted, and the angle portion near the distal end thereof is configured to bend and deform by operating the operation wire in the operation portion to pull the operation wire. In the insertion portion, a portion connecting the angle portion and the operation portion is provided on a flexible portion having flexibility.

In the angle portion, a plurality of angle rings are sequentially connected to an inner peripheral portion thereof via connection pins so as to be tiltable, and the angle ring is tilted by a pulling operation of an operation wire connected to the tip angle ring. The insertion section is formed so as to be curved as a whole, and is provided such that the imaging direction of the distal end of the insertion section can be changed.

[0004] An operation wire connected to the angle portion is extended from the insertion portion to the operation portion and connected to a bending operation mechanism, and the operation wire is slid by operating the bending operation mechanism to bend the angle portion. However, there is provided an angle adjustment mechanism for restricting the angle from being manipulated beyond a predetermined angle.

As this angle adjustment mechanism, for example, as disclosed in Japanese Patent Publication No. 3-74568, an operation wire from an angle portion and an operation wire connected to a bending operation mechanism are provided in the middle of the operation wire. 2. Description of the Related Art There is known a structure in which a connecting member is interposed for connection, and a stopper that comes into contact with the connecting member is provided to restrict an amount of movement, thereby setting an angle angle.

As disclosed in Japanese Utility Model Publication No. 2-9762, there is also known a structure in which the stopper comes into contact with the operation wire from the inside. In this structure, the fixing position of the stopper is adjusted by a long hole. It is provided so as to be capable of adjusting the angle even after assembling the endoscope.

[0007]

However, in the angle adjustment device for an endoscope as described above, the operation wire is connected to the pulley of the bending operation mechanism from both sides, and the operation wire is The interval is widened in the operation unit. On the other hand, in order to reduce the burden on the operation of the operator, it is necessary to reduce the size of the operation unit. However, in the case where the stopper is provided from the outside as in the former prior art, the operation unit is not used. And the burden on the operator increases.

On the other hand, in the latter prior art, in which the stopper is provided from the inside, it is advantageous in terms of compactness, but the position adjustment of the stopper, that is, the adjustment of the restriction position is changed by a long hole to change the fixing position. Therefore, it cannot be applied to the case where the operation wires are arranged in two layers on both sides, and it is difficult to reduce the size in that case, and the fixing force of the stopper may be insufficient.

That is, in the installation of the stopper and the adjusting mechanism of the stopper, the operator may further operate the bending operation mechanism so as to bend it further even if the angle is restricted. It must be installed in a structure that ensures a regulated state even when a force is applied.

On the other hand, it is also required that an operation for adjusting the angle adjusting mechanism can be easily performed without disassembling each part.

In view of the above circumstances, the present invention has been made in view of the above circumstances, and is intended to provide an angle in an endoscope capable of obtaining an angle adjustment by adjusting the angle and adjusting the angle while maintaining a compact and firm fixing structure. It is an object to provide an angle adjusting device.

[0012]

In order to achieve the above-mentioned object, an angle adjusting device for an endoscope according to the present invention is provided with a tip portion provided at a bendable angle portion provided at an insertion portion inserted into the subject. And a connecting member for extending a plurality of operation wires for bending and deforming the angle portion by the pulling operation from the insertion portion to the operation portion, and connecting an end portion of the operation wire and a wire from the bending operation mechanism. A stopper member that regulates the movement amount of the connecting member is provided, and a stopper adjusting mechanism that adjusts the angle by adjusting the regulating position of the stopper member is provided. A stopper portion slidably disposed, and the stopper member abutting against one end of the connecting member from inside, and a moving direction of the connecting member connected to the stopper portion inside the connecting member. The stopper adjusting mechanism is disposed in an inner space between the connecting members on both sides, and the stopper adjusting mechanism is formed along the disposing direction of the supporting shaft. And a holding portion formed by a holding groove for holding the supporting shaft portion, wherein each holding groove of the holding portion contacts the supporting shaft portion at a plurality of points.

Preferably, the support shaft is formed in a round bar shape, and the holding groove is formed as a V-shaped groove.

On the other hand, in another angle adjusting device of the present invention, the tip is connected to a bendable angle provided in an insertion portion inserted into the subject, and the angle is adjusted by the pulling operation. A plurality of operation wires to be bent and deformed are extended from the insertion portion to the operation portion, and a connection member is provided for connecting an end of the operation wire and a wire from the bending operation mechanism, and regulates a movement amount of the connection member. A stopper member is provided, and a stopper adjusting mechanism for adjusting an angle angle by adjusting a restricting position of the stopper member is provided. The connecting member is formed by a guide member and a cover member covering the guide member. The stopper member is inserted into a reciprocating motion path formed in the movable member and is movably disposed, and the stopper member is in contact with one end of the connecting member from inside and is connected to the stopper portion. A stopper adjusting mechanism having a holding portion for holding the supporting shaft of the stopper member, the stopper adjusting mechanism having a holding portion for holding the supporting shaft of the stopper member. In addition, an adjustment window is provided in the central portion of the guide member between the cover member and the cover member corresponding to the position where the stopper adjustment mechanism is provided, the adjustment window capable of adjusting the position of the stopper member by loosening the holding portion. It is characterized by the following.

[0015]

According to the above construction, a plurality of angle operation wires are connected to the bending operation mechanism of the operation unit via the connection member, and the angle of the stopper is adjusted by adjusting the stopper member for controlling the amount of movement of the connection member. Regarding the arrangement of the mechanism, a stopper adjusting mechanism is arranged at an inner position sandwiched between the connecting members at a portion where the connecting member is arranged on both sides of the operation unit, and the stopper member contacts the connecting member from the inside. It is possible to make it compact by installing it as much as possible, and it is firmly fixed by holding and holding the rod-shaped support shaft of the stopper member so as to come into contact at a plurality of points from both sides with the holding groove of the holding portion of the stopper adjustment mechanism. This makes it possible to securely maintain the restricted state even if the operator performs a bending operation beyond the restricted angle.

Further, when the support shaft portion is formed in a round bar shape and the holding groove is formed by a V-shaped groove, it can be constituted by a simple machined part.

On the other hand, the connecting member is inserted into a reciprocating path formed by the guide member and the cover member, and a stopper adjusting mechanism is provided between the reciprocating paths on both sides. In the case where the adjusting window is opened in the cover member, the adjusting operation of the angle angle can be easily performed without disassembling each part.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a main part of an endoscope according to an embodiment, and FIG.
3 and 4 are a front view and a plan view, respectively, showing a part of the internal structure of the operation unit.

The endoscope 1 is provided with an operation section 2 which is gripped by an operator to perform various operations, and an insertion section 3 on the distal end side to be inserted into a subject. The operation unit 2 includes a main body case 10 at a base end,
It is composed of a grip case 11 and a branch case 12 which are connected to the main body case 10 in order.

On the other hand, the insertion portion 3 has an angle portion 14 that can be bent and deformed in an arbitrary direction, and a tip observation portion 15 is provided at a tip side of the angle portion 14, and the tip portion is not shown. An optical system such as an image sensor and an imaging objective lens and other various members are installed, and an opening through which forceps are inserted, a tube through which air and water are supplied, and the like are inserted. A flexible portion 16 having flexibility is connected to a proximal end of the angle portion 14, and the operating portion 2 is connected to the proximal end of the flexible portion 16 for performing various operations such as photographing and bending operations. Is what is done. A protective sleeve 17 and a tapered cover rubber 18 are provided on the outer periphery of a connection portion between the flexible portion 16 of the insertion portion 3 and the operation portion 2, that is, on the distal end side of the branch portion case 12.

The main body case 10 of the operation unit 2 includes a bending operation mechanism 20 and the like, and has up and down and left and right operation knobs 21 and 22 for operating the bending operation mechanism 20. Water supply valve 25, suction valve 26, shooting switch 27
Is installed, and a light guide and other various tubes connected to an unillustrated illumination light source, and a connecting flexible portion for leading out cords are connected to the back side.

The gripping case 11 becomes thinner and circular in order from the connection with the main body case 10 and is connected to the branch case 12. The branch case 12 has a forceps port for inserting a treatment tool such as forceps. 12a is provided, and a sub water supply piping device 28 is provided near the forceps port 12a.

In the inside of the gripping case 11, a tip end is connected to a bendable angle portion 14 provided in the insertion portion 3, and the other end is connected to the bending operation mechanism 20. 4 for a total of 2 for bending and 2 for bending in the horizontal direction
The operation wires 30, 30,... Are arranged, and the bending operation mechanism is provided.
The angle portion 14 is bent and deformed by a tensile operation corresponding to the operation 20.

The operation wires 30, 30,...
Are respectively inserted into protective members 31, 31,... Formed by metal protective pipes. In the flexible portion 16 of the insertion section 3, the operation wires 30, 30,. Are fixed to the ends of the protection members 31, 31,... Extending into the holding case 11, respectively.

On the other hand, from the main body case 10 to the grip case 11
A plate-shaped support member 34 is provided extending into the support member.
The bending operation mechanism 20 is attached to one end of 34.
A bracket 33 for engaging and holding the four fixing sleeves 32, 32,... Is fixed to the other end of the support member.

The bending operation mechanism 20 includes two pulleys 35 and 36 rotatably supported by the support member 34, and a rotation shaft 37 of the pulleys 35 and 36 extends laterally from the main body case 10. It is linked to an up / down operation knob 21 and a left / right operation knob 22. That is, the first pulley 35 is rotated by the up / down operation knob 21, and the second pulley 36 is rotated by the left / right operation knob 22. A pair of short operation wires 30a, 30a,... On both sides are connected to the first and second pulleys 35, 36, respectively.
A pair of operating wires 30 connected to it for six rotations
a, 30a is wound up and the other is unwound. A first lock member 23 for fixing the rotation of the up / down operation knob 21 and a second lock member 24 for fixing the rotation of the left / right operation knob 22 are provided adjacent to each other (see FIG. 1). ).

Are connected to the ends of the operation wires 30a, 30a,... Connected to the pulleys 35, 36, respectively. The connectors 42, 42,... Are respectively provided at the ends of the operation wires 30, 30, ... extending from the fixing sleeves 32, 32, ... which are engaged and held, and the connectors 42, 42,. 41,41,
… Which is screwed into the end of the angle section 14 and the bending operation mechanism
The operation wires 30, 30a from the 20 pulleys 35, 36 are respectively connected.

Are respectively inserted into four reciprocating paths A, A,... Having a rectangular cross section formed by a guide member 44 and a cover member 45 as shown in FIG. Are arranged so as to move along the reciprocating paths A, A,. A spring is provided inside the connecting members 41, 41,... To adjust the length of the wire (absorb the looseness), and the pulley side ends of the connecting members 41, 41,. Are configured to contact the members 47, 47,... To regulate the amount of movement, that is, the maximum amount of bending (angle angle) of the angle portion 14. The guide member 44 and the cover member 45 are also fixed to the support member 34.

The guide member 44 has the connecting members on both sides.
The upper and lower reciprocating paths A, A,... Each of which accommodates 41, 41,. A wedge-shaped space is formed between the passages on both sides so as to spread out in a V-shape as it becomes smaller. That is, the guide member 44 is
The vertical walls 44b and 44c are erected on both sides of the vertical wall 44a, and one bottom wall 44a is formed to be thicker.
Are formed high. Middle-stage walls 44d, 44d are connected to the outside intermediate portions of the vertical walls 44b, 44c on both sides in parallel with the bottom wall 44a, and the bottom wall 44a is fixed to the support member 34 by fixing screws (not shown).

On the other hand, the cover member 45 is formed such that the upper surface 45a has a step on both sides corresponding to the upper ends of the vertical walls 44b, 44c of the guide member 44 so that the pulley side is widened, and both side surfaces 45b, 45c ( The vertical surface is formed so as to close the sides of the middle wall 44d and the bottom wall 44a, and is supported by the mounting piece 45d.
Attached to 34. The guide member 44 and the cover member 45 form the two-stage reciprocating motion paths A, A,... Above and below the middle step wall 44d.

An adjustment window 45e is formed in a substantially middle portion of the upper surface 45a of the cover member 45 so as to open the space above the space between the vertical walls 44b and 44c on both sides. The vertical walls 44b, 44c of the guide member 44 are removed at the pulley side portion, and the inner surfaces of the reciprocating motion paths A, A,.

Next, as shown in FIG. 6, stopper members 47a, 47a,... Which can abut on one end of the connecting members 41, 41,. Support shaft part of 47
b, 47b,... Each stopper part 47a, 47a, ...
Are inserted and fixed at one end, and the other end extending in a direction perpendicular to the support shafts 47b, 47b,..., And the operating wires 30a, 30a,. Chipped U groove 47c,
47c, ... are formed. Further, the stopper portions 47a, 47
The heights of a,... are formed such that they can be inserted into the reciprocating paths A, A,.

The stopper members 47, 47,... Are supported on the pulley side portion of the guide member 44 so that stopper portions 47a, 47a,. Shaft
Are arranged to extend toward the bracket 33 along the moving direction of the connecting members 41, 41,.
Are arranged movably along the reciprocating paths A, A,... In a range where the vertical grooves 44b, 44c are removed. The support shafts 47b, 47b,... Of the stopper members 47, 47,.
Are fixed to the stopper adjustment mechanism 48 so as to be slidable.

The stopper adjusting mechanism 48 is disposed on the support member 34 between the vertical walls 44b and 44c on both sides inside the adjusting window 45e of the cover member 45 (see FIG. 4). The stopper adjusting mechanism 48 includes a support shaft portion of the four stopper members 47, 47,.
, And four holding portions 49, 49,... For fixing 47b, 47b,..., And three upper, middle, and lower split portions 48a, 48b, 48c on upper and lower two split surfaces parallel to the support member 34. The upper divided portion 48a is shorter than the lower divided portion 48c, and the upper and lower divided surfaces are formed through two holding portions 49, 49, respectively. Holding parts formed on both sides of each division surface
49, 49, the first pulley 35 or the second pulley
The support shaft portions of the stopper members 47, 47 that abut against the connecting members 41, 41 of the pair of operation wires 30a, 30a respectively connected to 36.
47b, 47b are clamped.
In this embodiment, a step is formed on the divided surface based on the difference in height of the support shaft portions 47b, 47b corresponding to the connection height to the pulleys 35, 36.

Each of the holding portions 49, 49,... Is a support shaft portion 47b, 47b,.
, Which extend in the direction of extension of the support shafts 49a, 49a,..., And which hold the support rods 47b, 47b,. The lower divided portion 48c is fixed to the support member 34 by a mounting portion 48d extending forward and backward.On the upper surface of the lower divided portion 48c, the support shaft portions 47b, Nipping grooves 49a, 49a forming the lower half of the holding portions 49, 49 for nipping the 47b are formed. Also, on the lower surface of the middle dividing portion 48b, the stopper members 4 on both sides of the lower stage are provided.
Nipping grooves 49a, 49a forming the upper half of the holding parts 49, 49 for holding the supporting shaft parts 47b, 47b of the 7,47 supporting shaft parts are formed, and the supporting shaft parts of the stopper members 47, 47 on both sides of the upper stage are formed at the rear part of the upper surface. 47b, 47b
Holding grooves 49a, which form the lower half of the holding portions 49, 49
49a is formed. Further, on the lower surface of the upper divided portion 48a, the support shaft portions of the stopper members 47, 47 on both sides of the upper stage are provided.
Nipping grooves 49a, 49a forming the upper half of the holding portions 49, 49 for nipping 47b, 47b are formed.

The stopper adjusting mechanism 48 is provided with a first fastening screw 51 for integrally fastening the divided portions 48a, 48b and 48c at one end of the central portion, and an upper divided portion at an intermediate portion. A second fastening screw 52 is provided to fasten the middle section 48b and the middle section 48b to close the upper holding sections 49, 49.
On the other end side, a third fastening screw 53 for fastening the middle divided part 48b and the lower divided part 48c to close the lower holding parts 49, 49 is provided.

Upper and lower V-shaped holding grooves 49 in the holding portion 49
As shown in FIG. 7, the holding state of the support shaft portion 47b between the support shaft portions 47a and 49a is such that the holding grooves 49a and 49a contact the support shaft portion 47b at a plurality of points (two points). The shape of the support shaft portion 47b and the shape of the holding groove 49a of the holding portion 49 can be appropriately changed to a round bar, a V-groove, or a shape that comes into contact with a plurality of points.

The operation of the above embodiment will be described.
The operating wires 30, 30,...
When connecting to the first, each of the protective members 31, 31,
Are fixed to the ends of the operating wires 30, 30, and the connectors 42, 42, are attached to the distal ends of the operating wires 30, 30, and the supporting members 34 are attached to the fixing sleeves 32, 32,. And hold it in engagement with the bracket 33 attached to the bracket.

The support member 34 includes a bending operation mechanism 20.
And a guide member 44 are attached, and short operation wires 30a, 30a,... Connected to pulleys 35, 36 of the bending operation mechanism 20, respectively, extend along the guide member 44, and are connected at the ends thereof. Are inserted into the reciprocating paths A, A,... Of the upper and lower guide members 44 on both sides.

The connectors 42, 4 of the operation wires 30, 30, which perform a pair of relative operations for bending operation in the left and right directions on the lower side.
2 and operation wires 30a, 30a connected to the first pulley 35
The connecting members 41, 41 are connected to each other and mounted on the reciprocating motion paths A, A at the lower stage on both sides of the guide member 44. Similarly, connectors 42, 42 of a pair of operation wires 30, 30, which perform a pair of relative operations for bending operation in the vertical direction, and an operation wire 30 connected to the second pulley 36.
a, 30a are connected to the connecting members 41, 41, and are mounted on the reciprocating motion paths A, A at the upper stage on both sides of the guide member 44.

Further, the vertical walls 44b, 44c of the guide member 44
The lower divided portion 48c of the stopper adjusting mechanism 48 is fixed between the two, and the stopper members 47, 47 on both lower sides are fixed to the stopper portion 47.
a, 47a are inserted from the inside into the lower reciprocating movement paths A, A on both sides, the U-grooves 47c, 47c are inserted into the operation wires 30a, 30a, and the support shafts 47b, 47b are connected to the lower divided section 48c. It is set on the holding grooves 49a, 49a formed obliquely on both sides, the middle divisional portion 48b is placed thereon, and the third fastening screw 53 is tightened to move the lower stopper members 47, 47 to predetermined positions. Fix it. Also, the stopper members 4 on both upper sides are placed on the middle divided portion 48b.
7, 47 are inserted into the upper reciprocating paths A, A on both sides of the stopper portions 47a, 47a from the inside, and the U-grooves 47c, 47c
0a, 30a, the support shafts 47b, 47b are set on the oblique holding grooves 49a, 49a on both sides of the middle division 48b, and the upper division 48a is mounted thereon. Put second
After tightening the fastening screw 52 to fix the upper stopper members 47, 47 at a predetermined position, the first fastening screw 51 is tightened to firmly fix the whole. In this state, the support shaft portions 47b, 47b,... (Round bars) of the stopper members 47, 47,.
Are held in contact with the holding grooves 49a, 49a,... At a plurality of locations on the circumference to prevent movement in the axial direction.

Subsequently, a cover member 45 is set on the guide member 44 so as to cover the guide member 44, and is fixed to the support member 34 by fixing screws, whereby the reciprocating motion paths A, A,.
Are formed in a cylindrical shape to restrict the movement of the connecting members 41, 41,. After this,
The endoscope 1 is configured by assembling the grip case 11 and the like.

By operating the up / down operation knob 21 or the left / right operation knob 22 of the bending operation mechanism 20, the angle portion 14 of the insertion section 3 is operated to bend, and the rotation of the operation knobs 21 and 22 is performed. According to pulley 35,36
Are rotated, one of a pair of operation wires 30a, 30a,... Connected to the pulleys 35, 36 is wound up and the other is unwound. , 30a,... Move to the pulley side, and the tip ends of the connecting members 41, 41a,.
When they come into contact with 47a, 47a,..., The further movement is restricted, so that the rotation operation of the pulleys 35, 36, that is, the operation knobs 21, 22, becomes impossible, and the maximum angle angle is restricted.

The operating force of the operating knobs 21 and 22 in the restricting state in contact with the stopper portions 47a, 47a,... Clamps the support shaft portions 47b, 47b of the stopper members 47, 47,. Are held by the holding portions 49 of the stopper adjusting mechanism 48.

To change the maximum angle, the first fastening screw 51 of the stopper adjusting mechanism 48 is loosened from the adjusting window 45e of the cover member 45 with the holding case 11 removed, and the stopper members 47, 47 that need to be adjusted are Second, corresponding to the lower side
Alternatively, the third fastening screws 52, 53 may be loosened, and the stopper members 47, 47 to be adjusted may be moved in the axial direction to adjust the regulating position, and then the loosened first fastening screw 51 and the second or third fastening screw 52, 53 may be adjusted. Tighten 53 to re-clamp.

A chassis 55 (see FIG. 2) is separately provided in parallel with the support member 34 (base plate).
Various operation members or components other than the bending operation mechanism 20 are provided on the 55, and the connecting support with the insertion section 3 is provided in a structure performed by the chassis 55, and another deformation force acts on the bending operation mechanism 20. This ensures that the operation is performed without any problem.

[0047]

According to the angle adjusting device for an endoscope of the present invention, the amount of movement of the connecting member connecting the ends of the plurality of operation wires for bending and deforming the angle portion and the wire from the bending operation mechanism is regulated. A stopper adjusting mechanism for adjusting an angle by adjusting a stopper member including a stopper portion and a support shaft portion is provided in an inner space between the connecting members on both sides, and a holding member for holding the support shaft portion of the stopper member. By making the groove come into contact with the support shaft at multiple points, a firm clamping state can be obtained and a large holding force can be secured, and even if the operator bends more than the regulated angle angle, it will be sure The restriction position can be held.

Also, in the case where the connecting member is inserted into the reciprocating path of the guide member and the cover member, a stopper adjusting mechanism is provided between the reciprocating paths on both sides, and the adjusting window is opened in the cover member. The angle angle can be adjusted without disassembling each part, and the workability is reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of an endoscope according to an embodiment of the present invention.

FIG. 2 is a front view showing the internal structure of the operation unit of the endoscope, partially cut away;

FIG. 3 is a plan view showing the internal structure of the operation unit of the endoscope, partially cut away;

FIG. 4 is a cross-sectional plan view of a main part cut at a center portion of the stopper adjustment mechanism.

FIG. 5 is a perspective view of a guide member and a cover member.

FIG. 6 is an exploded perspective view of a stopper member and a stopper adjustment mechanism.

FIG. 7 is a sectional view showing a fixed state of a support shaft portion of a stopper member by a stopper adjustment mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Endoscope 2 Operation part 3 Insertion part 10 Main body case 11 Grasping case 14 Angle part 20 Bending operation mechanism 30,30a Operation wire 34 Support member 35,36 Pulley 41 Connection member 42 Connector 44 Guide member 45 Cover member 47 Stopper member 47a Stopper part 47b Support shaft part 48 Stopper adjusting mechanism 49 Holding part 49a Holding groove

Claims (3)

(57) [Claims] 1. A distal end portion is connected to a bendable angle portion provided in an insertion portion inserted into a subject, and a plurality of operation wires for bending and deforming the angle portion by a pulling operation are provided in the insertion portion. A connecting member extending from the operating member to connecting the end of the operating wire and the wire from the bending operation mechanism, a stopper member for restricting a moving amount of the connecting member is provided, and a restricting position of the stopper member is provided. An end angle adjusting device for an endoscope provided with a stopper adjusting mechanism for adjusting an angle by adjusting the connecting member, wherein the connecting member is slidably disposed on both sides of the operation section, and the stopper member is connected to the connecting member. A stopper portion that contacts one end of the member from inside and a rod-shaped support shaft portion that is connected to the stopper portion and extends in the moving direction of the connecting member inside the connecting member; The stopper adjusting mechanism is disposed in an inner space between the connecting members on both sides, and the stopper adjusting mechanism is formed along the direction in which the support shaft is provided, and is held by a holding groove for holding the support shaft. An angle adjusting device for an endoscope, wherein each holding groove of the holding portion contacts the supporting shaft at a plurality of points. 2. An angle adjusting device for an endoscope according to claim 1, wherein said support shaft portion is formed in a round bar shape, and said holding groove is formed by a V-shaped groove. 3. A distal end portion is connected to a bendable angle portion provided on an insertion portion inserted into the subject, and a plurality of operation wires for bending and deforming the angle portion by a pulling operation are provided in the insertion portion. A connecting member extending from the operating member to connecting the end of the operating wire and the wire from the bending operation mechanism, a stopper member for restricting a moving amount of the connecting member is provided, and a restricting position of the stopper member is provided. In the angle adjusting device for an endoscope provided with a stopper adjusting mechanism for adjusting the angle by adjusting the angle, the connecting member is formed on both sides of the operating portion by a guide member and a cover member covering the guide member. The stopper member is inserted into the reciprocating path and is movably disposed, and the stopper member is connected to the stopper portion from inside and is in contact with one end of the connecting member. A stopper adjusting mechanism having a holding portion for holding the supporting shaft portion of the stopper member, the stopper adjusting mechanism having a holding portion for holding the supporting shaft portion of the stopper member. An adjusting window which is disposed at a central portion of the guide member between the cover member and the cover member corresponding to the position where the stopper adjusting mechanism is disposed, and which is capable of adjusting the position of the stopper member by loosening the holding portion. An angle adjusting device for an endoscope, comprising: