JP2001271852A - One-way clutch structure - Google Patents

Abstract

(57) [Problem] To provide a one-way clutch mechanism in which a spring is prevented from entering a gap between rotating shafts. SOLUTION: Gears 128 and 130 of a gear assembly 132 provided with a one-way clutch mechanism 152 are provided.
The sleeve 160 is mounted on each of the shaft portions 154 and 156 facing each other so as to rotate integrally.
Each sleeve is wound around a wire 168 by being inserted into a spring 166, and is connected so as to be integrally rotatable. The wire has a long rectangular cross section, and the spring is wound so that the longitudinal direction of the cross section of the wire is in the axial direction, thereby increasing the contact width of the wire with the sleeve, and This prevents malfunction of the one-way clutch mechanism caused by entering the gap between the sleeves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive material processing apparatus for transporting a photosensitive material by a transport roller and processing the photosensitive material. The present invention relates to a one-way clutch structure that enables a transport roller to rotate relative to a drive source when a tension acts.

[0002]

2. Description of the Related Art Conventionally, in an automatic developing apparatus for processing a photosensitive material such as an image-exposed film, a processing solution such as a developing solution, a fixing solution, and washing water is sequentially immersed in the processing solution, followed by a drying process. And finish. In such an automatic developing device, a pair of rollers is arranged along a conveying path of a photosensitive material, and a driving force from a driving source is transmitted to the pair of rollers to pinch and convey the photosensitive material. If the material is sandwiched between a plurality of pairs of rollers, the photosensitive material may bend between the pair of rollers, resulting in poor transport of the photosensitive material.

In an automatic developing apparatus, the photosensitive material is provided with tension by preventing the bending of the photosensitive material by slightly increasing the transport speed by a pair of rollers on the downstream side in the transport direction. Further, when a difference in the conveying speed of the photosensitive material is given, a large tension may be generated on the photosensitive material. In an automatic developing device, a one-way clutch mechanism is provided for a pair of rollers for holding the photosensitive material in order to prevent a large tension from being generated in the photosensitive material. It rotates relatively to the drive source.

In a one-way clutch used in an automatic developing device, a metal spring is wound so as to straddle a rotation shaft on a driving source side and a rotation shaft on a roller side. In this state, the rotation shaft on the drive source side rotates, and the metal spring is tightened by frictional force, so that the rotation shafts on the drive source side and the roller side rotate integrally. Further, when the rotation shaft on the roller side is pulled in the loosening direction of the metal spring, the metal spring is loosened, so that the metal spring relatively rotates in the loosening direction with respect to the rotation shaft on the driving side.

[0005]

However, since the metal spring forming such a one-way clutch mechanism is formed of a thin wire having a diameter of about 1 mm and a round cross-sectional shape, due to the performance of the clutch, it is difficult to drive the metal spring. The wire rod may enter the gap between the rotation shaft on the source side and the rotation shaft on the roller side, resulting in malfunction of the clutch mechanism, deformation or damage of the metal spring, and the like.

In order to prevent the metal spring from dropping into the gap, it is necessary to process and assemble the component with high precision so as to reduce the gap between the rotating shafts. Will lead to a rise.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and prevents a malfunction or damage caused by a metal spring being pinched or dropped between a driving side shaft and a driven side rotating shaft. It is an object of the present invention to propose a one-way clutch structure.

[0008]

In order to achieve the above object, the present invention provides a spring in which a wire is spirally wound.
A one-way clutch structure in which a pair of rotary shafts arranged coaxially are connected so as to be integrally rotatable by being inserted, and the pair of rotary shafts are relatively rotatable according to a winding direction of the wire; Wherein the cross-sectional shape of the rotating shaft in the axial direction is formed such that a contact width with the rotating shaft becomes a predetermined width.

According to the present invention, the wire is wound so as to come into surface contact with a predetermined width along the axial direction of the rotating shaft. The conventional wire with a round cross-section has a very narrow contact width along the axial direction of the rotating shaft, so it is easy to fit between the rotating shafts, but by increasing the contact width of this wire,
If the gap between the rotating shafts is smaller than the contact width, it is possible to prevent the wire from being fitted between the rotating shafts.

[0010] Accordingly, it is possible to suppress the occurrence of operation failure, damage to the wire rod, and the like due to the wire rod being fitted between the rotary shafts.

In the present invention, the spring may be formed such that the cross-sectional shape of the wire is long along the axial direction of the rotation shaft. By increasing the length in the axial direction of the rotation shaft, it is possible to prevent the wire from falling between the rotation shafts.

Further, in the present invention, it is more preferable that the cross section of the wire is formed in a substantially long rectangular shape.

[0013] By forming the cross-sectional shape of the wire into a long rectangular shape, without increasing the cross-sectional area and outer diameter of the wire.
The contact width with the rotating shaft can be widened, and the wire can be more reliably prevented from dropping between the rotating shafts.

If the gap between the rotating shafts is smaller than the contact width of the wire along the axial direction, the wire does not fall between the rotating shafts, so that the allowable range of the gap between the rotating shafts can be expanded. In addition, the processing accuracy and assembly accuracy of parts can be reduced.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of an automatic developing apparatus 10 to which the present embodiment is applied. The automatic developing device 10 performs a developing process on a film 12 as a photosensitive material. The film 12 may be in the form of a sheet, may have a long length along the transport direction, and may be wound in a roll.

The automatic developing apparatus 10 is formed by a processing solution processing section 16 and a drying section 18. Processing liquid processing unit 1
6 is provided with a developing tank 22 for storing a developing solution along the transport direction of the film 12, a fixing tank 24 for storing a fixing solution, and a washing tank 26 for storing washing water. Rinsing tanks 28 and 30 are provided between the developing tank 22 and the fixing tank 24 and between the fixing tank 24 and the washing tank 26. Water is supplied to each of the rinsing tanks 28 and 30 as a rinsing liquid.
2. The water overflowing to the fixing tank 24 is used as dilution water when replenishing the developing replenisher and the fixing replenisher.

The developing solution in the developing tank 22 and the fixing solution in the fixing tank 24 are heated by passing through a heat exchanger in the circulation path while being circulated by a pump (not shown), and the film 12 is optimally finished. It is maintained at a predetermined temperature. The replenishing stock solution and the diluting water, which are replenished to the developing tank 22 and the fixing tank 24 at a predetermined timing, are stirred so as to be uniformly mixed with the developing solution and the fixing solution when the developing solution and the fixing solution are circulated. .

In the vicinity of the film insertion port 32 of the automatic developing apparatus 10, an insertion roller pair 36 is disposed, and the film 12 inserted from the insertion table 34 into the insertion port 32 is provided.
The processing liquid processing unit 1 is nipped by the insertion roller pair 36.
It is drawn into 6. Note that a scanner or the like may be arranged in place of the insertion table 34 so that the film 12 which is image-exposed and output by the scanner is sent to the film insertion slot 32.

Each of the developing tank 22, the fixing tank 24 and the washing tank 26 is provided with a developing rack 40, a fixing rack 42 and a washing rack 44. Each of the developing rack 40, the fixing rack 42, and the rinsing rack 44 includes a plurality of roller pairs 58 and guides 60 that are bridged between a pair of rack side plates, and these form a substantially U-shaped conveyance path. Have been.

Above the developing tank 22, the fixing tank 24 and the washing tank 26, a crossover rack 52 provided with an insertion roller pair 36 and a roller pair 62, a crossover rack 54 provided with a roller pair 64, and Roller pair 66,
A crossover rack 56 provided with 68 is arranged. Roller pair 6 of crossover racks 52 and 54
Reference numerals 2 and 64 are disposed in the rinsing baths 28 and 30, respectively, and a part of the lower roller is immersed in the rinsing liquid supplied into the rinsing baths 28 and 30. Guide portions 92 are provided on the crossover racks 52, 54, 56, and the guide portions 92 cover the liquid surfaces of the developing solution, the fixing solution and the washing water, and reduce the area in contact with air. .

The driving force of a driving source (not shown) is transmitted to each of the developing rack 40, the fixing rack 42, the washing rack 44, and the crossover racks 52, 54, 56, so that the roller pair 58 is inserted together with the insertion roller pair 36. The roller pairs 62, 64, 66, 68 are driven to rotate in the transport direction of the film 12.

As a result, when the film 12 inserted from the film insertion port 32 is nipped by the insertion roller pair 36 and drawn into the processing liquid processing section 16, the developing rack 4
0, transported by a crossover rack 52, a fixing rack 42, a crossover rack 54, and a washing rack 44, immersed in a developing solution, a fixing solution and washing water in order, and subjected to development, fixing and washing processes. The film 12
When passing through the rinsing tanks 28 and 30, the roller pair 6
The surface is washed with a rinsing liquid (water) pumped by the lower rollers of the films 2 and 64, and the processing liquid attached to the surface of the film 12 and taken out of the processing tank on the upstream side is washed away.

The film 12 that has been subjected to the water washing process is conveyed to the drying unit 18 by a pair of rollers 66 and 68 of the crossover rack 56. At this time, the roller pair 66, 6
Reference numeral 8 also serves as a squeeze for squeezing out moisture adhering to the surface of the film 12.

In the drying section 18, a transport path for transporting the film 12 in a substantially horizontal state by a plurality of roller pairs 72 is formed. The film 12 is conveyed in the drying unit 18 while being pinched by the roller pair 72, and is then directed downward by the roller pair 74 and the guide 76 provided at the most downstream, and the discharge port formed in the machine frame 14. It is discharged from 78 to a film receiver 80.

The drying section 18 has a plurality of infrared heaters 82 and reflecting mirrors 8 arranged vertically above and below the transport path of the film 12.
6 are provided. In the drying unit 18, the conveyed film 12 is heated and dried by radiant heat emitted from the infrared heater 82. A guide 84 formed of a stainless steel wire is provided between each of the infrared heaters 82 and the conveyance path of the film 12, and guides the film 12 to the downstream side while preventing the film 12 from contacting the infrared heater 82. .

In the drying unit 18, a plurality of fans 88 are provided on the opposite side of the film 12 on the side of the infrared heater 82.
Are arranged. These fans 88 take in air outside the machine and blow it onto the surface of the film 12 as dry air. A blowing pipe 90 is disposed downstream of the drying unit 18 with the conveyance path of the film 12 interposed therebetween. Outside air sucked by a fan 94 disposed below the drying unit 18 is supplied to the blowing pipe 90 as drying air, and the drying air is blown onto the surface of the film 12.

The drying air blown from the fan 88 and the blowing pipe 90 removes moisture evaporated from the surface of the film 12 to promote drying. The fan 88 maintains the temperature of the surface of the film 12 heated by the infrared heater 82 within a predetermined temperature range.

The automatic developing apparatus 1 thus configured
In the case of 0, when the film 12 is conveyed while being pinched by the roller pair, the conveyance speed on the downstream side in the conveyance direction is slightly higher than that on the upstream side in the conveyance direction so that conveyance failure due to slackness does not occur in the film 12. Like that. Thus, when the film 12 is sandwiched across a plurality of roller pairs, the film 12 is transported in a state where tension is applied due to a difference in transport speed.

FIG. 2 shows a main part of a crossover rack 56 provided in the washing tank 26 as an example of a processing rack. The crossover rack 56 has a substantially box shape in which a pair of side plate portions 100 and a guide portion 92 provided between the side plate portions 100 are integrally formed. Rollers 102, 104, 1 constituting roller pairs 66, 68
06, 108, the rotating shafts 110, 112
Bearing 1 inserted into bearing hole 114 formed in
16 and is journalled.

The rollers 102 to 108 are connected to one rotating shaft 1
Small gears 118 are provided on the first and second gears 10 and 112.
2, 104 and rollers 106, 108 rotate integrally. Further, rollers 102 and 104 facing each other
And bearings 116 for supporting the rollers 106 and 108,
A ring-shaped coil spring 120 is wound around the roller pair 66, 6 by the urging force of the coil spring 120.
8 is provided with a holding force for holding the film 12.

One roller 10 of the roller pair 66, 68
The rotating shaft 11 protruding from the side plate portion 100
2, small gears 122 and 124 are provided. Further, a shaft 126 is protruded from the side plate portion 100, and a gear assembly 132 having gears 128 and 130 is provided on the shaft 126. The gear 128 of the gear assembly 132 meshes with the small gears 122 and 124 of the roller pairs 66 and 68.

The side plate 100 has a shaft 126.
A shaft 134 is protruded at a predetermined distance from the side plate 100, and a shaft 136 extends between the side plates 100.

A gear assembly 142 having gears 138 and 140 which rotate integrally is supported on the shaft 134. The gear 138 of the gear assembly 142 is
Are engaged with the gear 130 of the gear assembly 132.

Further, the shaft 136 is inserted and supported by a bearing 146 mounted in a bearing hole 144 provided at a predetermined position of the side plate portion 100. This shaft 13
6, a gear 150 is attached together with a gear 148 that meshes with the gear 140 of the gear assembly 142.
The gear 150 provided on the shaft 136 is a helical gear, and meshes with a worm gear to which a driving force of a driving source (not shown) is transmitted.

In the crossover rack 56, the gear 15
0, the driving force is transmitted to the gear 148,
A small gear 122 provided on the roller pair 66, 68 via the gear assembly 142, the gear assembly 142;
The roller pair 66 and 68 rotate in the transport direction of the film 12 at a predetermined rotation speed.

As shown in FIGS. 3 and 4, the one-way clutch mechanism 1 is attached to the gear assembly 132.
52 are formed.

Each of the gears 128 and 130 is provided with shaft portions 154 and 156 protruding from the shaft center portions in a direction approaching each other.
4 and 156, a shaft hole 158 through which the shaft 126 is inserted is formed. A sleeve 160 formed into a substantially cylindrical shape using a metal such as stainless steel is fitted into the shaft portions 154 and 156.

The length of the sleeve 160 along the axial direction is the length of the shafts 154, 1 formed on the gears 128, 130.
The length is substantially the same as 56 along the axial direction. Thereby, as shown in FIG. 4, when the gears 128 and 130 are assembled, the tips of the shafts 154 and 156 abut each other, and the end surfaces of the sleeve 160 fitted into the shafts 154 and 156 abut. Like that.

As shown in FIG. 3, each of the shaft portions 154 and 156 has a flat portion
The sleeve 160 has a flat portion 162
, A flat portion 164 is formed on the inner surface (the shaft portion 156 is not shown in FIG. 3). Thus, the sleeve 160 is fitted and fitted to the shaft portions 154 and 156 with the flat portion 164 aligned with the flat portion 162, so that the sleeve 160 rotates integrally with the respective gears 128 and 130.

The gear assembly 132 includes the gear 12
A spring 166 is disposed between the first and second springs 8 and 130. The spring 166 is formed by tightly spirally winding a wire rod 168 made of metal such as stainless steel.

As shown in FIG. 5, the wire 168 used for the spring 166 is formed in a rectangular shape having a long cross section, and the spring 166 has a longitudinal direction of the cross section of the wire 168 of the shaft 126. It is wound so as to be in the axial direction. The inner diameter of the spring 166 is wound so as to be substantially the same as the outer diameter of the shaft portions 154 and 156.

As shown in FIGS. 3 and 4, the gear assembly 132 includes a shaft 154 of the gear 128 and the spring 1.
The shaft portion 156 of the gear 130 is inserted from one end of the spring 166. As shown in FIG. 4, the length along the axial direction of the spring 166 is:
The spring 166 is shorter than the length connecting the two sleeves 160, and the spring 166 is attached to the sleeve 160 of the shaft portion 154.
The gears 128 and 130 are engaged with each other through the spring 166.

As shown in FIG. 4 (not shown in FIG. 3), the gear 130 has a ring-shaped cover 170 projecting from the surface on the gear 128 side.
The spring 166 is covered by the contact of 0 with the end face of the gear 128.

The spring 16 thus arranged
In No. 6, the inner surface 172 of the wire rod 168 (the inner surface of the spring 166) is in contact with the peripheral surface of the sleeve 160, so that the sleeve 160 and the spring 166 can rotate integrally by friction.

For example, when one of the sleeves 160 rotates in the direction in which the spring 166 is wound,
6 is tightened, and the spring 166 tightens both sleeves 160 to rotate together. On the other hand, when one of the sleeves 160 rotates in the direction (slack direction) opposite to the direction in which the spring 166 is wound, the spring 166 is loosened, and the tightening force on the sleeve 160 is weakened. A relative rotation occurs between them.

Thus, in the gear assembly 132, the gear 130 causes the pair of rollers 66 and 68 to
In the direction of arrow B (FIGS. 2 and 3).
), The springs 166 are tightly wound, and the gears 130 and 128 rotate together, and the roller pair 6 is rotated.
The driving force is transmitted to 6, 68.

On the other hand, when a rotational force is generated in the gear 128 on the roller pair 66, 68 side in the direction of arrow B with respect to the gear 130, the sleeve 160 provided on the gear 128 is provided.
The gear 128 rotates relative to the gear 130 in the direction of arrow B.

The operation of the present embodiment will be described below.

When operation start is instructed by operating an operation panel (not shown), the developer in the developing tank 22 and the fixing tank 2
A start-up operation is performed so that a predetermined temperature is set in advance for each of the fixing liquid in the drying unit 4 and the inside of the drying unit 18, and when the start-up operation is completed, the film 12 can be processed.

In the automatic developing apparatus 10, when the film 12 inserted from the insertion port 32 is detected in a state in which the processing is enabled, the developing rack 40 and the cloth rack 40 are adjusted so that the transport speed of the film 12 becomes the set speed. Overrack 5
2. Fixing rack 42, crossover rack 54, washing rack 44, crossover rack 56, and drying unit 18
Drive the inner roller pair.

As a result, the film 12 inserted from the insertion port 32 is drawn into the processing solution processing section 16,
It is immersed in a developing solution, a fixing solution, and washing water in this order to perform development, fixing, and washing. At this time, as the transport speed of the film 12 gradually increases toward the downstream side in the transport direction of the film 12, a predetermined tension is applied to the film 12, and the film 12 is transported smoothly without slack.

The water-finished film 12 is conveyed while being squeezed by the pair of rollers 66 and 68 of the crossover rack 56 and sent to the drying unit 18. In the drying unit 18, the film 12 is heated by the radiant heat from the infrared heater 82 while the film 12 is transported by the roller pair 72, and the drying air is blown from the fan 88 and the blowing pipe 90 to dry the film 12. The film 12 that has been subjected to the drying process is discharged from the discharge port 78 to the outside of the machine frame 14.

Incidentally, in the automatic developing apparatus 10, the film 1 is prevented from being loosened while being transported.
As 2 is sent to the downstream side, the transport speed is gradually increased, and the tension of the film 12 is applied by the speed difference so that the film 12 does not loosen.

At this time, if the tension applied to the film 12 becomes too large, the rotation speed of the roller and the film 1
Due to the difference in the conveyance speeds of 2, the surface of the film 12 is rubbed by the roller, and the film 12 is broken or the like. The automatic developing device 10 includes a developing rack 40, a fixing rack 42, a rinsing rack 44, a crossover rack 5
2, 54, 56, etc. are provided with one-way clutch mechanisms.

For example, the crossover rack 56 provided in the washing tank 26 is provided with a gear 1 to which the driving force is transmitted.
A one-way clutch mechanism 152 is provided on the gear assembly 132 of the rotary shaft 112 of the roller pair 50 and the roller pairs 66 and 68. Thereby, in the crossover rack 56,
When the roller pair 72 in the drying unit 18 pulls the film 12, the film 12 pulls the roller pairs 66 and 68 in the transport direction.

When the pair of rollers 66 and 68 is pulled in the transport direction by the film 12, in the gear assembly 132 in which the one-way clutch mechanism 152 is provided, the gear 128 on the pair of rollers 66 and 68 becomes the gear 130 on the driving source side. , A rotational force in the direction of the arrow B is generated, and when the rotational force exceeds a predetermined value, the spring 166 is loosened. As a result, the gear 128 rotates relative to the gear 130, and the tension of the film 12 is reduced.

As described above, the one-way clutch mechanism 15
The spring 166 used in No. 2 transmits the driving force to the roller pair 66 and 68 in a state where the sleeve 160 is fastened by the spirally wound wire rod 168.

The wire 1 used for the spring 166
68 has a substantially rectangular shape whose cross-sectional shape is long along the axial direction of the spring 166. That is, as shown in FIG. 5, the width dimension D of the wire 168 is increased without increasing the cross-sectional area and the thickness of the wire 168. This allows the spring 166 to be disposed in a small space with a small difference between the inner diameter and the outer diameter,
The contact area with zero can be increased, and the driving force can be transmitted reliably.

As described above, by making the cross section of the wire rod 168 rectangular and widening the width dimension D, even if a gap d is formed between the respective sleeves 160 on the gear 128 side and the gear 130 side, this gap d is formed by the wire rod 168. The wire 168 does not enter between the sleeves 160 unless the width D is larger than the width D of the sleeve 160.

That is, when a wire having a round cross section is used, even if a slight gap is formed in the sleeve 160, the wire is fitted between the sleeves 160, which causes a malfunction of the one-way clutch mechanism. I will. Such a malfunction of the one-way clutch mechanism is caused by the film 12
In this case, the automatic developing device 10 for processing the film may cause a conveyance failure, or the film 12 may be damaged by rubbing marks or breakage.

On the other hand, since the cross section of the wire 168 is rectangular, the gap d between the sleeves 160 is not larger than the width D of the wire 168 unless the width d is larger than the width D of the wire 168.
8 does not fit between the sleeves 160. In addition, since the spring 166 extends the direction of the cross section of the wire 168 along the sleeve 160, the spring 166 fits more between the sleeves 160 than a wire having the same cross-sectional area or the same height from the contacting sleeve 160. It is hard to get in.

Thus, the one-way clutch mechanism 15
2 prevents operation failure due to the wire rod 168 being fitted between the sleeves 160 and damage to the spring 166.
Further, the film 12 processed by the automatic developing apparatus 10 is not damaged.

The one-way clutch mechanism 152 is
If the distance d between the sleeves 160 is smaller than the width D of the wire 168, the wire 168 is
The sleeve 16
Since the sleeve 160 and the gears 128 and 130 may be formed so that the interval d of 0 is smaller than the width D of the wire 168, the processing accuracy and the accuracy can be improved as compared with the case where a wire having a round cross section is used. The assembling accuracy can be lowered, and the manufacturing cost and assembling cost of the parts can be reduced.

The embodiment described above does not limit the configuration of the present invention. For example, in the present embodiment, the wire rod 168 having a substantially rectangular cross section is used, but the cross sectional shape of the wire rod is not limited to this, and may be an elliptical shape, at least along the axial direction of the spring 166. The contact width may be wider than that of a conventional wire having a round cross section.

Further, in this embodiment, the one-way clutch structure is applied to the roller pair. However, the present invention can be applied to a single roller for conveying the photosensitive material instead of the roller pair.

Further, in this embodiment, the spring 1
66 is wound around the sleeve 160, but the spring 1 is mounted on either the sleeve 160 on the drive side gear 130 or the sleeve 160 on the roller side gear 128.
One end of 66 may be fixed. At this time, the other end of the spring 166 is wound around the sleeve 160.

In this embodiment, the film 12 is used as an example of the photosensitive material, and the automatic developing device 10 for processing the film 12 has been described. However, the present invention is not limited to this, and the present invention is not limited thereto. The present invention can be applied to a photosensitive material processing apparatus used for processing other photosensitive materials such as a photosensitive lithographic printing plate. Further, the present invention is not limited to the photosensitive material processing apparatus, and can be used as a one-way clutch mechanism of a transmission mechanism having an arbitrary configuration for transmitting a rotational force.

[0068]

As described above, according to the present invention, it is possible to prevent the wire forming the spring from being fitted between the rotary shafts, so that the wire is fitted between the rotary shafts. An excellent effect that the occurrence of operation failure can be prevented can be obtained. Further, a predetermined function can be reliably performed with a simple configuration without causing an operation failure.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an automatic developing device according to an embodiment.

FIG. 2 is a schematic perspective view showing a crossover rack provided in the automatic developing device.

FIG. 3 is a perspective view showing a schematic configuration of a gear assembly according to the present invention.

FIG. 4 is a schematic cross-sectional view of the gear assembly cut along an axial direction.

FIG. 5 is a schematic cross-sectional view taken along an axial direction showing a main part of the gear assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Automatic developing apparatus 12 Film 56 Crossover rack 66, 68 Roller pair 126 Shaft 128, 130 Gear 132 Gear assembly 152 One-way clutch mechanism 154, 156 Shaft part (rotation axis) 160 Sleeve (rotation axis) 166 Spring 168 Wire rod

Claims (3)

[Claims] 1. A pair of rotary shafts coaxially arranged are inserted into a spring in which a wire is spirally wound so as to be integrally rotatable, and the pair of rotary shafts are arranged in accordance with a winding direction of the wire. A one-way clutch structure that enables relative rotation of the wire shaft, wherein a cross-sectional shape of the wire in the axial direction of the rotation shaft is formed so that a contact width of the wire with the rotation shaft becomes a predetermined width. One-way clutch structure. 2. The one-way clutch structure according to claim 1, wherein the spring has a cross-sectional shape of the wire rod that is long along an axial direction of the rotation shaft. 3. A one-way clutch structure according to claim 2, wherein the wire has a substantially rectangular cross-sectional shape.