JP2003325437A - Tractive member operating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tractive member operating device which enables a small force of slanting a control lever to move a tractive member by a desired distance for curving a curvature and is excellent in operation performance. <P>SOLUTION: The curving apparatus 30 comprises a plurality of wires 33 which are stretched from the one end fixed to the top of an insertion section 2, a pulley 34 which has a plurality of circular grooves 34a wound by the middle lines of their respective wires 33, a motor 35 which rotates the pulley 34 wound by the wires 33, an arm part 36 which has a plurality of arms 36a fixing the stop ends of their respective wires 33 stretched after winding the circular grooves 34a of the pulley 34, and a curving lever 32 which is changed in a slant direction and in a degree to select specific wires 33 from the wires 33 and indicate them to move by a desired length. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation instruction lever tilting operation for a pulling member having one end portion fixedly mounted on the distal end side and the other end portion fixedly mounted on an operation instruction lever located on the proximal end side. The present invention relates to a traction member operating device that moves back and forth.

[0002]

2. Description of the Related Art Conventionally, an endoscope has been widely used as an apparatus for observing and inspecting the inside of a body cavity, the inside of a pipe of a structure, or a gap. This endoscope is mainly composed of an insertion portion to be inserted into a body cavity, a structure, or the like, and an operation portion provided at a proximal end portion of the insertion portion. In addition, there is one in which the insertion portion is provided with, for example, a bending portion that can be bent in the up / down direction and the left / right direction.

The bending portion is adapted to be bent by advancing and retracting an operation wire (not shown) which is a pulling member inserted through the inside of the insertion portion. Therefore, the distal end portion of the operation wire is fixed to the bending portion, and the base end portion is fixed to the operation wire attachment mechanism portion integrated with one bending operation lever which is the operation instruction lever provided in the operation portion. Therefore, by tilting the bending operation lever, the corresponding operation wire is moved back and forth,
The bending portion can be bent in a desired direction.

However, in the endoscope having the construction in which the bending operation lever is tilted to bend the bending portion as described above, there is an advantage that one bending operation lever can perform bending operation in four directions, for example. Since the bending operation lever is tilted and the corresponding operation wire is directly pulled, the bending operation lever becomes heavy. Also, a considerable amount of force was required to maintain the bent state of the bending portion.

Therefore, many endoscopes having a pulling member operating device for increasing the bending amount of the bending portion by reducing the operation amount of the bending operation lever have been proposed, for example, Japanese Utility Model Publication No. 56-48241. In the head bending device, two semi-circular plates bent in a semi-circular shape with long grooves are assembled so that the long grooves intersect at right angles, the operating rod is passed through the intersecting long grooves, and both ends of both semi-circular plates are A fixed shaft is movably supported, and a rotary shaft is provided on the extension of the fixed shaft so that the rotation of the semicircle is transmitted. The rotary shaft is connected to a wire operation mechanism. Bending operation is possible.

Further, in the head bending device disclosed in Japanese Utility Model Publication No. 63-5684, two semi-circular plates bent in a semi-circular shape having long grooves are assembled so that the long grooves intersect with each other, and the long grooves intersected with each other. In a bending device having an operating rod inserted therein, one end of a semicircular plate is pivotally supported by a bearing, and the other end is a plurality of planetary gears meshing with internal teeth formed inside an angle drum around which an angle operation wire is wound. To increase the movement of the wire.

Further, in the endoscope of Japanese Utility Model Publication No. 2-42246, a fluid pressure cylinder is provided in the operation body, and a piston rod of the fluid pressure cylinder is connected to a pulley which is a rotating body supported by the operation body. The bending part is bent through the operation wire that is frequently used for this pulley.
The effort was reduced.

Further, in the endoscope disclosed in Japanese Patent Laid-Open No. 58-65132, a motor for driving the tip bending mechanism, a bending operation member provided in the operation portion and receiving an operation force manually,
The motor has a detection means for detecting the amount of operation force received by the bending operation member and a control means for processing the signal obtained by the detection means and controlling the drive power to the motor to detect the operation force amount and to output the motor. Had to drive.

[0009]

However, in the bending method of the bending portion shown in the above-mentioned JP-B-56-48241, JP-B-63-5684 and JP-B-2-42246, the structure is complicated. In addition, the shape becomes large. Further, the operation amount increases as the movement amount of the wire that bends the bending portion increases, which is not practical.

In the method of bending the bending portion disclosed in Japanese Patent Laid-Open No. 58-65132, a control circuit is required to detect the operation amount and drive the motor according to the detected operation amount. It became a complicated structure.

The present invention has been made in view of the above circumstances, and the operation instruction lever can be tilted with a small amount of operation force to move a desired pulling member by a desired amount to perform a bending operation of a bending portion. It is an object of the present invention to provide a traction member operating device having excellent operability.

[0012]

In the traction member operating device of the present invention, a traction member having one end fixed to the distal end of an elongated insertion portion and extending, and a middle portion of the traction member are in predetermined states. A pulley having a plurality of circumferential grooves wound around it, driving means for rotating the pulley in a predetermined direction with the pulling member wound around, and winding means arranged around the pulley circumferential groove. And a plurality of arm members each having a plurality of arm portions to which the base ends of the extended pulling members are fixed, and the arm members are integrally fixed, and the tilt direction and the tilt amount are changed to change the tilting direction. An operation instruction lever for instructing to move a predetermined pulling member from the pulling member by a predetermined amount is provided.

The angle formed by the pulling member extending from the pulley toward the tip and the pulling member extending from the pulley toward the arm member is between 10 and 180 degrees.

Further, it is rotatable with respect to the pulley,
The cushioning member is provided between the pulley and the pulling member and is fixed to the pulling member for generating a frictional force.

According to these configurations, the operation instruction lever is tilted to change the pulling state of the pulling member that extends from the pulley and goes toward the arm member, so that the pulling member that extends from the pulley and goes toward the tip end portion. Is pulled in the direction of rotation of the pulley.

Since the angle between the pulling members with respect to the pulley is set between 10 degrees and 180 degrees, the degree of freedom in the arrangement position of the operation instruction lever in consideration of operability is increased.

Further, by providing the cushioning member, it is possible to prevent the problem that the surface condition of the pulley is changed and the force applied to the operation wire is changed and the operation wire is worn and cut.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 8 relate to a first embodiment of the present invention, FIG. 1 is a diagram for explaining an endoscope provided with a pulling member operating device of the present invention, and FIG. 2 is a pulling member operation provided in the endoscope. FIG. 3 is a longitudinal sectional view for explaining the device, FIG. 3 is a view for explaining a main part of the traction member operating device, FIG. 4 is a view for showing an arrow A in FIG. 2, FIG. FIG. 7 is a diagram illustrating the operation of the bending device, FIG. 7 is a diagram illustrating another configuration of the operation unit, and FIG. 8 is a diagram illustrating another configuration of the operation unit.

Incidentally, FIG. 6A shows a state in which the pulling member is wound in a predetermined loose state, and FIG. 6B shows a state in which the pulling member is moved by the rotation of the pulley. Is.

As shown in FIG. 1, the endoscope 1 of the present embodiment.
Is mainly composed of a flexible and elongated insertion portion 2 which is inserted into a body cavity or a structure, and an operation portion 3 which is provided on the proximal end side of the insertion portion 2.

The insertion portion 2 has a distal end portion 2 in order from the distal end side.
1, a bending portion 22 in which bending pieces to be described later are connected to each other to bend in, for example, the up / down and left / right directions, and a flexible tube portion 23 having flexibility. Although not shown in the drawings, an observation window, an illumination window, a forceps outlet, a jet nozzle for feeding water or air, and the like are provided on the tip surface of the tip portion 21.

The operating portion 3 is provided with a grip portion 31 and is formed in a substantially h-shape. The grip portion 31 is a bending device 30 which is one of the pulling member operation devices for bending the bending portion 22. A bending operation instruction lever (hereinafter, abbreviated as a bending lever) 32 configuring the above is provided so as to project from the opening 3a.

The bending lever 32 performs a tilting operation for changing a tilting direction and a tilting angle to move a pulling member, which will be described later, to bend the bending portion 22 in a desired direction by a desired bending angle. When the bending lever 32 is upright as shown in the figure, the bending portion 22
Has a linear configuration.

A light guide fiber (not shown) for supplying illumination light from, for example, the base end of the operation section 3 is used.
Also, a universal cord 4 in which a drive control signal (not shown) or a signal cable (not shown) for transmitting and receiving an image signal of an observation site photoelectrically converted by this image sensor is inserted is extended.

As shown in FIGS. 2 and 3, the curved portion 22 is formed.
, 22n are connected in series, and a distal end hard member 21a forming the distal end portion 21 is formed.
The tip ends of four operation wires 33 corresponding to the up / down / left / right operation directions of the bending device 30 are fixed to predetermined positions on the frontmost bending piece 22a of the bending portion 22 connected to each other. ing.

As shown in FIGS. 2 to 4, in the bending device 30 which is the pulling member operating device of the present embodiment, the operating wires 33 and the circumferential grooves 34a in which the mid-sections of the operating wires 33 are wound are arranged. A pulley 34, a motor 35 that is a drive unit that rotates the pulley 34 in a predetermined direction with a predetermined torque during a bending operation, and a substantially cross provided on the bending lever 32 to which the base end of the wire 33 is fixed. It is mainly configured with a shaped arm member 36.

The four operation wires 33 are inserted into the wire insertion conduit 33A inserted through the insertion portion 2 and extended into the operation portion 3 and wound around the pulley 34. There is. Then, the proximal end portion of the wound operation wire 33 is integrally fixed to a predetermined curved arm portion 36a of the arm member 36 by wire stoppers 33b.

The middle part of the operating wire 33 is wound around the circumferential groove 34a in a predetermined loose state. The pulley 34 is rotated by a first gear 37a and a second gear 37b that transmit the driving force of the motor 35. Further, the bending lever 32 and the arm member 36 are coaxially attached and fixed at predetermined opposing positions of a bearing 40, which will be described later, rotatably arranged on the frame 38. Reference numeral 39 is a bearing that rotatably supports the pulley 34.

As shown in FIG. 5, the bearing 40 is mainly composed of a circular shaft 41 and a pair of ball bearings 42 and 43. The circular shaft 41 is formed in a substantially cylindrical shape, and the arm member fixing portion 41a is formed on a part of the side peripheral surface of the circular shaft 41.
Is protruding. The arm member fixing portion 41a is formed with a through hole 41b through which the bending lever 32 is inserted. The bending lever 32 is inserted through the through hole 41b, and the arm member 36 is provided at the tip of the bending lever 32.
The through hole 36b provided in the central portion of the curved arm portion 36a is inserted, and the fixing nut 44 is attached to the screw portion 32.
The arm member 36 and the bending lever 32 are coaxially fixed to the circular shaft 41 by being screwed into a.

The first ball bearing 42 and the second ball bearing 43 are formed in a hemispherical shape in which a spherical member is divided into two parts. Then, the circular bearings 42a and 43a, into which the circular shaft 41 is fitted and arranged, are formed inside the respective hemispherical halves. Further, the first ball bearing 42 and the second ball bearing 43 include first cutout portions 42b and 43b that form a groove portion 40B in which the arm member fixing portion 41a provided on the circular shaft 41 is disposed, and Second cutout portions 42c and 43c that form a groove portion 40C in which the bending lever 32 fixed to the circular shaft 41 is arranged are provided. Further, the first ball bearing 42 and the second ball bearing 43, when integrated, form a pair of semi-cylindrical portions 42 that form a shaft portion 40D.
d and 43d are provided coaxially. Note that reference numeral 36c
Is a wire fixing hole through which the operation wire 33 is inserted.

The bearing 40 has a circular shaft 41, to which the arm member 36 and the bending lever 32 are coaxially attached and fixed.
It is configured to be sandwiched between the ball bearing 42 and the second ball bearing 43.
Therefore, the circular shaft 41 is configured to be swingable in the direction of the arrow X1 and the direction of the arrow X2 within the range of the groove portions 40B and 40C.

Further, the circular shaft 41 is connected to the first ball bearing 4
2 and the second ball bearing 43, the semi-cylindrical portion 42
By arranging the shaft portion 40D integrally formed with d and 43d at a predetermined position of the frame 38 so as to be rotatable, the bearing 40 can swing in the arrow Y1 direction and the arrow Y2 direction. become.

The circumferential groove 34 of the pulley 34
The proximal ends of the four operation wires 33 that are wound and extended in a predetermined state on a are respectively fixed to the wire fixing holes 36c,
When the bending lever 32 is in the upright state as shown in FIG. 3, all the pulley rear side portions of the operation wire 33 extending from the pulley 34 toward the arm member 36 are in a predetermined relaxed state.

By operating the bending lever 32 in the arrow X1 direction or the arrow X2 direction, or in the arrow Y1 direction or the arrow Y2 direction in the drawing, the bending lever 3 is moved.
The arm member 36 is swung together with the tilting operation of 2, so that the arm portion 36 corresponding to the tilting direction of the bending lever 32.
The tension of the operation wire 33 on the rear side of the pulley attached to the wire fixing hole 36c formed in a is changed from the slack state to the pulled state, and the drag force from the operation wire 33 to the pulley 34 increases. Then, the resistance force between the operation wire 33 and the pulley 34 increases. On the other hand, the other operation wires 33 are further loosened.

The operation of the endoscope 1 configured as described above will be described. When observing with the endoscope 1, first, the motor 3
5 is driven and the pulley 34 is rotated. At this time, since the bending lever 32 is in the upright state, all the operation wires 33 wound around the pulley 34 are in a predetermined relaxed state as shown in FIG. 6 (a). Therefore, all the operation wires 33 are slid with respect to the pulley 34, and the bending state of the bending portion 22 is maintained in a straight state.

Next, it is assumed that the bending lever 32 is tilted in the arrow Y2 direction (see FIG. 3) in order to bend the bending portion 22 upward, for example. Then, with the tilting operation of the bending lever 32, the bearing 40 is moved to the semi-cylindrical portion 4
The arm member 36 is tilted by pivoting about a shaft portion 40D that is configured by integrating 2d and 43d. As a result, the upward operation wire 33 located on the proximal end side of the pulley 34 fixed to the wire fixing hole 36c of the arm portion 36a corresponding to the tilting direction of the bending lever 32 gradually becomes loose. It changes into a pulled state. At this time, the operation wires 33 corresponding to the other downward and left and right directions are further loosened.

Therefore, of the operation wires 33 wound around the circumferential groove 34a of the pulley 34 in a loose state, only the drag force of the upward operation wire 33 on the pulley 34 increases. That is, the operation wire 3 for the upward direction
The resistance between 3 and the pulley 34 increases.

Then, as shown in FIG. 6B, the resistance between the upward operating wire 33 and the pulley 34 is increased, so that the rotational force of the pulley 34 rotated by the motor 35 is increased. The operation wire 33 is transmitted to the operation wire 33, and the operation wire 33 is moved in the rotation direction. As a result, in the present embodiment, the pulley 34
Operation wire 33 for the upward direction arranged on the distal end side
Is pulled and moved toward the arm portion 36a, and the bending portion 22
Begins to bend upward. In this state, by continuously tilting the bending lever 32 in the same direction so as to increase the drag force of the operation wire 33 for upward movement on the pulley 34, the operation arranged on the tip side of the pulley 34 is continued. The wire 33 is further pulled and moved, and the bending portion 22 is further bent upward.

Then, when the tilted position of the bending lever 32 is continuously maintained, the operation wire 3 is moved along with the movement of the operation wire 33 arranged on the tip side of the pulley 34.
The drag force of the pulley 3 on the pulley 34 gradually decreases, and the movement is stopped in a state where a tensile force is generated on the operation wire 33 disposed on the distal end side of the pulley 34. At this time, the operation wires 33 other than the operation wire 33 corresponding to the bending direction are in a relaxed state. Then, by continuing to hold the bending lever 32 in this state, the state of the operation wire 33 is held in that state, and the bending state of the bending portion 22 is held.

When the bending portion 22 is further bent in the same direction, in another direction, or returned to the original state, the bending lever 32 is tilted in a desired direction. As a result, the resistance of the operation wire 33 corresponding to the tilting operation to the pulley 34 is changed, and the corresponding operation wire 33 is moved to change the bending portion 22 to the bending state corresponding to the tilting operation of the bending lever 32. .

As described above, the arm portion of the arm member configured to swing in response to the tilting operation of the bending lever for instructing to bend the bending portion in the vertical / horizontal direction is rotated in a predetermined direction by the motor. By fixing the operation wire corresponding to the up, down, left, and right directions that is wound around the pulley in a predetermined loosened state and extended, the operation wire corresponding to the tilting operation is tilted and fixed to the arm member by tilting the bending lever. It is possible to change the drag force of the corresponding operation wire on the pulley by changing the tension state of the operation wire, move the operation wire in the rotation direction of the pulley, and bend the bending portion.

Further, by decreasing the holding force amount from the state in which the bending lever is tilted, the operation wire that has been pulled returns to the distal end side, and the bending lever returns to the original position. All the operation wires in the pulled state are in the relaxed state, and the bent state can be returned to the straight state.

As a result, the bending lever is continuously tilted by only slightly increasing the resistance of the operating wire to the pulley, and the bending portion can be easily bent in the desired direction by the desired amount. Further, when the bending state of the bending portion is maintained, since a tensile force is generated from the pulley to the operation wire corresponding to the bending direction, only a part of the force applied to the operation wire is applied to the bending lever. The burden on the user holding the bending lever is greatly reduced.

In this embodiment, the bending lever 32 is tilted in the direction of the arrow Y2 and fixed to the arm portion 36a of the arm member 36.
Although an example of the operation of pulling 3 to bend the bending portion 22 has been described, the bending lever 32 is moved in the arrow Y1 direction or the arrow X.
By tilting in one direction, the arrow X2 direction, the operation wire corresponding to the tilting operation of the bending lever can be pulled or loosened to bend the bending portion in a desired direction as described above. In addition, the bending lever 32
For example, by performing a tilting operation in a direction intermediate between the arrow Y2 direction and the arrow X2 direction or the like, a plurality of operation wires corresponding to the tilting operation can be moved to bend the bending portion in a desired direction as described above. .

Further, the form of the operating portion 3 is not limited to the above-mentioned substantially h-shape, in other words, the position of the grip portion 31 provided on the operating portion 3 is limited to the position of the above-mentioned embodiment. Instead, when the bending lever 32 is arranged in the neutral state which is the initial state,
When the pulling states of the operation wires 33 coincide with the tilting operation of 2, all the operation wires 33 can be arranged to be in a sliding state with respect to the pulleys 34 rotated by the motor 35. For example, the position of the grip 31A may be provided as shown in FIG. 7, or the grip 31B may be arranged as shown in FIG.

FIG. 9 is a view for explaining the relationship between the pulling member and the pulley according to the second embodiment of the present invention.
(A) is a figure explaining one structural example of an operating wire and a pulley, FIG.9 (b) is a figure explaining another structural example of an operating wire and a pulley, FIG.9 (c) is an operating wire and a pulley 9D is a diagram illustrating another example of the configuration of the friction member, FIG. 9D is a diagram illustrating an example of the arrangement of the friction member on the operation wire, and FIG. 9E is a diagram illustrating another example of the configuration of the pulling member.

In the first embodiment, the operating wire 3
3 is arranged directly in the circumferential groove 34a formed in the pulley 34, but in the present embodiment, as shown in FIG.
The C ring 34b, which is a cushioning member having a predetermined hardness, is rotatably arranged with respect to No. 4 and is arranged.

Thus, the C ring 34b having a predetermined hardness
Is disposed between the operation wire 33 and the pulley 34, the direct contact between the operation wire 33 and the pulley 34 is prevented, and the pulley 34 that constantly rotates is scraped by the operation wire 33 and the surface state is reduced. It is possible to prevent the change of the force and the amount of force, and conversely, the operation wire 33 is worn by the pulley 34 which constantly rotates and the strand breaks.

As shown in FIG. 9 (b), a friction plate 34c having a predetermined friction coefficient is arranged between the C ring 34b and the pulley 34, and a rotational force is applied from the C ring 34b to the operating wire 33. Even if it is configured to transmit, the same operation and effect as described above can be obtained.

Further, as shown in FIG. 9C, the friction member 3
4d is configured to integrally cover the operation wire 33, or the friction member 34e is integrally disposed and fixed to the operation wire 33 as shown in FIG. 9 (d). Even if it is arranged in the circumferential groove 34a provided in the pulley 34, the same operation and effect as described above can be obtained.

Further, as shown in FIG. 9 (e), the pulling member is composed of two operation wires 33a and 33b and a connecting member 33c.
And the connecting member 33c is connected to the pulley 34
Even if it is arranged with respect to the C ring 34b arranged in the circumferential groove 34a provided in the above, the same operation and effect as described above can be obtained.

FIG. 10 is a view for explaining the tilting state adjusting section for adjusting the maximum tilting operation range of the bending lever according to the third embodiment of the present invention, and FIG. 10A shows the structure of the tilting state adjusting section. FIG. 10 (b) is a diagram for explaining the action of each member constituting the tilt state adjusting portion, and FIG. 10 (c) is a diagram for explaining the maximum tilt operation state of the bending lever.

As shown in FIG. 10A, a pair of first tilting state adjusting member 51 and second tilting state for adjusting the maximum tilting operation range of the bending lever 32 is provided in the projecting opening 3a of the bending lever 32. An adjusting member 52 is provided.
The first tilted state adjusting member 51 is formed of a flat plate member. On the other hand, the second tilt state adjusting member 52
Is formed of a stepped member provided with an escape portion 52a for the first tilted state adjusting member 51 formed of a flat plate member.

The first tilted state adjusting member 51 and the second tilted state adjusting member 52 are configured to be screwed and fixed to the plate 53 with square holes integrally fixed to the frame 38 by screws 54. Then, a female screw portion (not shown) is formed at a predetermined position of the plate 53, while the first screw portion is formed.
The tilted state adjusting member 51 and the second tilted state adjusting member 52 are provided with elongated holes 51b and 52b corresponding to the screws 54.

Therefore, as shown in FIG. 10B, the first tilting state adjusting member 51 and the second tilting state adjusting member 52 have the size of the square hole formed in the plate 53 as shown by the arrow. It is movable so that it can be changed slightly.

Then, as shown in FIG. 10B, the bending lever 32 is moved as shown in FIG. 10C by moving, for example, the first tilt state adjusting member 51 as shown by an arrow. The first tilt state adjusting member 51 is abutted. As a result, the maximum tilting operation range of the bending lever 32 becomes smaller than that in contact with the square hole formed in the plate 53. Therefore, the maximum bending angle of the bending portion is reduced.

As described above, by disposing the pair of first tilt state adjusting member and second tilt state adjusting member movable with respect to the plate, the size of the square hole formed in the plate in advance can be reduced. It is possible to appropriately adjust the tilting operation range of the bending lever by changing the tilting operation range.

Although the pulling member operating device has been described as a bending device for bending the bending portion in the above-described embodiments, the pulling member operating device is not limited to the bending device, and may be, for example, an endoscope. Then, it may be used in a traction member operating device provided in a crushed stone basket or the like for inserting into a body cavity and collecting crushed stone, for example. Further, in the endoscope, the four-direction bending operation is described as an example, but the same structure can be realized in the two-direction bending operation, and one operation wire and four operation wires can be used for four operation wires. Although a frictional force is generated in the vertical direction, it is also possible to use two motors and a pulley to operate vertically and horizontally. Furthermore, the motor can be turned on / off by adding a touch sensor circuit so that the motor rotates when the operator touches the bending operation lever.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0060]

According to the traction member operating device of the present invention, the operation instruction lever is tilted with a small amount of operation force to move the desired traction member by the desired amount to perform the bending operation of the bending portion. An excellent traction member operating device can be provided.

[Brief description of drawings]

1 to 7 relate to a first embodiment of the present invention, and FIG. 1 is a diagram for explaining an endoscope including a pulling member operating device of the present invention.

FIG. 2 is a longitudinal cross-sectional view illustrating a pulling member operation device provided in an endoscope.

FIG. 3 is a diagram illustrating a main part of a traction member operation device.

FIG. 4 is a view on arrow A in FIG.

FIG. 5 is a development view illustrating the structure of a bearing.

FIG. 6 is a diagram for explaining the operation of the bending device.

FIG. 7 is a diagram illustrating another configuration of the operation unit.

FIG. 8 is a diagram illustrating another configuration of the operation unit.

FIG. 9 is a diagram illustrating a relationship between a pulling member and a pulley according to a second embodiment of the present invention.

FIG. 10 is a view for explaining a tilting state adjusting unit that adjusts the maximum tilting operation range of the bending lever according to the third embodiment of the present invention.

[Explanation of symbols]

1 ... Endoscope 30 ... Bending device 32 ... Curved lever 33 ... Operation wire 34 ... pulley 34a ... Circumferential groove 35 ... Motor 36 ... Arm member 36a ... Arm part 40 ... Bearing

Claims (3)

[Claims] 1. A traction member having one end fixed to and extending from a distal end portion of an elongated insertion portion, and a middle portion of the traction member has a plurality of circumferential grooves wound and arranged in a predetermined state. And a drive means for rotating the pulley in a predetermined direction in a state where the pulling member is wound and arranged, and a base end portion of the pulling member which is wound and extended in a circumferential groove of the pulley. An arm member having a plurality of fixed arm portions and the arm member are integrally fixed, and the tilt direction and the tilt amount are changed, and a predetermined pull member is moved from the pull member by a predetermined amount. An operation instruction lever for giving an instruction to cause a traction member operation device. 2. The angle formed by the pulling member extending from the pulley toward the tip and the pulling member extending from the pulley toward the arm member is from 10 degrees to 1 degree.
The traction member operating device according to claim 1, wherein the traction member operating device is between 80 degrees. 3. A cushioning member, which is rotatable between the pulley and is provided between the pulley and the pulling member, is fixed to the pulling member for generating a frictional force. The traction portion seat phase difference device according to claim 1.