Spiral forward / backward actuator

Abstract

To suppress noise that is generated when a first band member and a second band member transition from a cylinder forming state to a separated state.SOLUTION: A spiral advancing / retracting actuator 100 includes: a first band member 101 and a second band member 102; an inner guide member 104 and an outer cylinder wall 105 as band member guiding means; and a band member accommodation vessel 106. The band member accommodation vessel 106 includes: a first accommodation chamber 107a which spirally accommodates the first band member 101 in a separated state after transition from a cylinder forming state; and a second accommodation chamber 108a which spirally accommodates the second band member 102 in the separated state after transition from the cylinder forming state. An inner bottom surface 107c of the first accommodation chamber 107a and an inner bottom surface 108c of the second accommodation chamber 108a are inclined so as to descend as they go away from an axis 100X.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a spiral advance / retract actuator. [Background technology]

[0002] Patent document 1 discloses a spiral forward / backward actuating device comprising a first band material having a first engagement structure at its upper edge portion and lower edge portion along the extension direction, and a second band material having a second engagement structure at its upper edge portion and lower edge portion along the extension direction, the second engagement structure being configured to be engageable with and detachable from the first engagement structure. The first and second band materials are wound spirally around a common axis while being offset from each other in the direction of the axis, so that the inner surface of the upper edge portion of the first band material and the outer surface of the lower edge portion of the second band material partially overlap in the direction of the axis, and the inner surface of the lower edge portion of the first band material and the outer surface of the upper edge portion of the second band material partially overlap in the direction of the axis, and the first engagement structure of the upper edge portion of the first band material and the second engagement structure of the lower edge portion of the second band material engage with each other in a manner that locks the two band materials in the overlapping surface direction, and the first engagement structure of the lower edge portion of the first band material and the second engagement structure of the upper edge portion of the second band material engage with each other in a manner that locks the two band materials in the overlapping surface direction, thereby forming a cylindrical structure. The spiral advancing / retreating actuator further includes a strip material guide means configured to spirally guide the first strip material and the second strip material, thereby enabling the first strip material and the second strip material to transition between a separated state in which they are separated from each other and a cylindrical configuration state in which they form the cylindrical structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4607772 Summary of the Invention [Problem to be solved by the invention]

[0004] In the spiral advancing and retreating actuator of Patent Document 1, noise is generated when the first and second band materials transition from a cylindrical state to a separated state.

[0005] An object of the present disclosure is to provide a technique for suppressing noise generated when a first band material and a second band material transition from a cylindrical configuration state to a separated state. [Means for solving the problem]

[0006] According to an aspect of the present disclosure, there is provided a method for manufacturing a tape carrier, comprising: a first tape material having a first engagement structure at an upper edge portion and a lower edge portion along the extension direction, a second tape material having a second engagement structure at an upper edge portion and a lower edge portion along the extension direction, the second engagement structure being configured to be engageable with and detachable from the first engagement structure; a tape material guide means; and a tape material storage container, wherein the first tape material and the second tape material are wound spirally around a common axis while being offset from each other in the direction of the axis, a state in which the first engagement structure of the upper edge portion of the first band material and the second engagement structure of the lower edge portion of the second band material lock the first band material and the second band material in the overlapping surface direction, with the inner surface of the upper edge portion of the first band material and the outer surface of the lower edge portion of the second band material partially overlapping in the axial direction, and the inner surface of the lower edge portion of the first band material and the outer surface of the upper edge portion of the second band material partially overlapping in the axial direction; and the first engagement structure of the lower edge portion of the first band material and the second engagement structure of the upper edge portion of the second band material engage with each other in a manner that locks the first and second band materials in the overlapping surface direction, forming a cylindrical structure; the band material guide means guides the first and second band materials in a spiral shape and is configured to be able to transition between a separated state in which the first and second band materials are separated from each other and a cylindrical state that forms the cylindrical structure; the band material storage container has a first storage chamber that stores the first band material that has transitioned from the cylindrical state to the separated state in a spiral shape, and a second storage chamber that stores the second band material that has transitioned from the cylindrical state to the separated state in a spiral shape, and the inner bottom surface of at least one of the first storage chamber and the second storage chamber is inclined so as to descend as it moves away from the axis. According to the above configuration, it is possible to suppress noise that occurs when the first and second band materials transition from a cylindrical state to a separated state. The inner bottom surface may be inclined so as not to come into contact with the corresponding band material. According to the above configuration, it is possible to reliably suppress noise generated when the first band material and the second band material transition from the tubular configuration to the separated state. The web material guiding means may include an inner guide member that spirally guides the first web material and the second web material, and an outer tube wall that is disposed on the outer peripheral side of the inner guide member and guides the first web material and the second web material so that the first web material and the second web material can transition between the separated state and the cylindrical state, and the outer tube wall may have a first inlet for introducing the first web material from the first storage chamber into an opposed gap between the inner guide member and the outer tube wall, and a second inlet for introducing the second web material from the second storage chamber into the opposed gap. With the above configuration, the web material guiding means can be realized with a simple configuration. The first introduction port and the second introduction port may both extend linearly parallel to the axis. According to the above configuration, the strip material guiding means can be realized with a simple configuration. The inclination angle of the inner bottom surface of the first storage chamber in a cross section obtained by cutting the band material storage container along a tangential direction of the first inlet in a plan view may be larger than the lead angle of the cylindrical structure, or the inclination angle of the inner bottom surface of the second storage chamber in a cross section obtained by cutting the band material storage container along a tangential direction of the second inlet in a plan view may be larger than the lead angle of the cylindrical structure. According to the above configuration, noise generated when the first band material and the second band material transition from a cylindrical configuration to a separated state can be reliably suppressed. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to suppress noise that occurs when the first band material and the second band material transition from a cylindrical configuration state to a separated state. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic vertical cross-sectional view showing the overall configuration of a spiral advancing and retreating actuator. [Figure 2] FIG. 2 is an exploded perspective view of the spiral forward / backward actuating device. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in FIGS. 1 and 2, a spiral advancing / retreating actuating device 100 includes a first band material 101 and a second band material 102, each of which is configured in a band shape. The first band material 101 and the second band material 102 are spirally wound around an axis 100X at positions offset from each other in the direction of the axis 100X to form a cylindrical structure 100A. In this case, in the cylindrical structure 100A, the first band material 101 is wound around the outside of the second band material 102. Specifically, an upper edge portion of the first band material 101 overlaps from the outside with a lower edge portion of the second band material 102 disposed above it, and an upper edge portion of the second band material 102 overlaps from the inside with a lower edge portion of the first band material 101 disposed above it. That is, the cylindrical structure 100A is formed by first and second band materials 101 and 102, each of which is spirally wound, partially overlapping each other alternately in the direction of the axis 100X.

[0010] The first belt material 101 and the second belt material 102 are made of, for example, belt materials (belts) having appropriate flexibility and elasticity. A material with relatively high rigidity, such as a metal plate or a hard synthetic resin plate, is preferably selected as the material for making the belt material. By forming such a material thin, a predetermined flexibility is ensured that the curved state capable of constituting the cylindrical structure 100A can be easily obtained.

[0011] 2, engagement pins 101a and 101b are provided at the upper and lower edge portions of the first band material 101 so as to protrude radially inward, and a plurality of these engagement pins 101a and 101b are preferably formed periodically at appropriate intervals in the extension direction of the first band material 101. In the illustrated example, the bases of the engagement pins 101a and 101b are fixed by caulking, welding, fusion bonding, adhesive, or the like while penetrating the first band material 101.

[0012] Engagement holes 102a and 102b configured to be engageable with and disengageable from the engagement pins 101a and 101b are provided in the upper and lower edge portions of the second web material 102 at positions corresponding to the engagement pins 101a and 101b of the first web material 101. Similar to the engagement pins 101a and 101b, a plurality of these engagement holes 102a and 102b are also formed at appropriate intervals, preferably periodically, in the extension direction of the second web material 102.

[0013] In the cylindrical structure 100A, the engagement pin 101a engages with the engagement hole 102b in the region where the upper edge portion of the first band 101 overlaps with the lower edge portion of the second band 102 disposed above the first overlapping portion, and the engagement hole 102a engages with the engagement pin 101b in the region where the upper edge portion of the second band 102 overlaps with the lower edge portion of the first band 101 disposed above the first overlapping portion. This secures the first band 101 and the second band 102 to each other in all directions on the overlapping surfaces, thereby maintaining the shape of the cylindrical structure 100A. In this way, the cylindrical structure 100A has high rigidity similar to that of a single cylindrical member, because the adjacent first band 101 and second band 102 partially overlap each other and the overlapping surfaces are secured together by an engagement structure.

[0014] In this embodiment, the engagement pins 101a and 101b are a specific example of a first engagement structure, and the engagement holes 102a and 102b are a specific example of a second engagement structure.

[0015] As shown in FIG. 1, a base 103 is provided at the bottom of the spiral advance / retreat actuator 100, and an inner guide member 104 having a cylindrical inner guide surface 104a is fixed to the base 103. This inner guide surface 104a is formed by the cylindrical outer surface of the inner guide member 104. As shown in FIG. 2, a spiral guide rib 104b and a guide groove 104c are provided on the inner guide surface 104a. In the illustrated example, two spiral guide ribs 104b and two spiral guide grooves 104c are formed on the inner guide surface 104a. The guide rib 104b engages with the upper edge 102u and the lower edge 102d of the second strip 102, thereby spirally guiding the second strip 102. In addition, the engagement pins 101a and 101b protruding from the inner surface of the first strip material 101 pass through the engagement holes 102a and 102b, respectively, and engage with the guide groove 104c, thereby guiding the first strip material 101 in a spiral shape together with the second strip material 102.

[0016] Returning to FIG. 1 , an outer cylindrical wall 105 having a cylindrical outer guide surface 105a is fixed on the base 103. This outer guide surface 105a is formed by the cylindrical inner peripheral surface of the outer cylindrical wall 105. The outer guide surface 105a is disposed radially opposite the inner guide surface 104a of the inner guide member 104. A facing gap G between the inner guide surface 104a and the outer guide surface 105a is large enough to accommodate the first and second band materials 101 and 102 stacked together, and is sized to allow the engagement pins 101a and 101b to remain engaged with the engagement holes 102a and 102b. Note that the facing gap G between the inner guide surface 104a and the outer guide surface 105a refers to the space sandwiched between the inner guide surface 104a and the outer guide surface 105a in the radial direction.

[0017] 1 and 2, the outer cylinder wall 105 is formed with a first inlet 105b for introducing the first band material 101 into the opposing gap G and a second inlet 105c for introducing the second band material 102 into the opposing gap G. The first inlet 105b and the second inlet 105c are slit-shaped with opening cross sections corresponding to the cross sections of the first band material 101 and the second band material 102 so that they can be inserted therethrough. As shown in FIG. 2, the first inlet 105b and the second inlet 105c both extend linearly so as to be parallel to the axis 100X.

[0018] Further outer peripherally of the outer cylinder wall 105, a strip storage container 106 is provided, which is rotatably supported relative to the outer cylinder wall 105. The strip storage container 106 has a first storage container 107 having a first storage chamber 107a capable of storing a first strip 101, and a second storage container 108 having a second storage chamber 108a capable of storing a second strip 102. The first storage container 107 and the second storage container 108 are supported by the outer cylinder wall 105 via rolling bearings 107b and 108b, respectively. This allows the first storage container 107 and the second storage container 108 to rotate freely relative to the outer cylinder wall 105.

[0019] The separated portion of the first band material 101 is stored in a spiral shape in the first storage chamber 107a of the first storage container 107. The separated portion of the second band material 102 is stored in a spiral shape in the second storage chamber 108a of the second storage container 108. In FIG. 1, the cross sections of the first band material 101 stored in a spiral shape in the first storage chamber 107a of the first storage container 107 and the second band material 102 stored in a spiral shape in the second storage chamber 108a of the second storage container 108 are shown by dashed lines.

[0020] As shown in Fig. 2, the inner bottom surface 107c of the first storage chamber 107a is inclined downward as it moves away from the axis 100X. More specifically, the inner bottom surface 107c of the first storage chamber 107a is inclined downward over the entire surface as it moves away from the axis 100X in the radial direction. The inner bottom surface 107c of the first storage chamber 107a is inclined so as not to come into contact with the lower edge 101d of the first strip material 101 stored in the first storage chamber 107a. As shown in Figs. 1 and 2, the inner bottom surface 107c of the first storage chamber 107a can be said to be a frusto-conical surface.

[0021] Similarly, the inner bottom surface 108c of the second storage chamber 108a is inclined downward as it moves away from the axis 100X. More specifically, the inner bottom surface 108c of the second storage chamber 108a is inclined downward over the entire surface as it moves away from the axis 100X in the radial direction. The inner bottom surface 108c of the second storage chamber 108a is inclined so as not to come into contact with the lower edge 102d of the second strip material 102 stored in the second storage chamber 108a. The inner bottom surface 108c of the second storage chamber 108a can be said to be a frusto-conical surface.

[0022] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. Referring to FIG. 3, a cross-section 108X is defined. The cross-section 108X is a surface that makes line contact with the outer peripheral surface 105d of the outer cylindrical wall 105 and passes through the outer opening 105e of the second inlet 105c. Simply put, the cross-section 108X is a surface that cuts the second storage container 108 along a tangential direction of the second inlet 105c in a plan view. FIG. 4 shows a cross-section taken along line IV-IV in FIG. 3. As shown in FIG. 4, the inclination angle 108t of the inner bottom surface 108c of the second storage chamber 108a at the cross-section 108X is defined as the angle between the inner bottom surface 108c and the horizontal plane H. Referring to FIG. 2, the lead angle 100t of the spiral structure of the tubular structure 100A is defined as the angle between the lower edge 101d of the first band material 101 in the tubular structure 100A and the horizontal plane H. The angle formed between the lower edge 101d of the first band material 101 in the cylindrical structure 100A and the horizontal plane H is equal to the angle formed between the lower edge 102d of the second band material 102 in the cylindrical structure 100A and the horizontal plane H. In the present embodiment, the inclination angle 108t is set to be larger than the lead angle 100t. This makes it possible to reliably secure a gap between the lower edge 102d and the inner bottom surface 108c of the second band material 102 discharged from the second inlet 105c to the second storage chamber 108a of the second storage container 108 along the cut surface 108X, as shown in FIG.

[0023] Returning to FIG. 1, a tip holding member 109 is provided at the upper end of the cylindrical structure 100A. That is, this tip holding member 109 holds the upper ends of both the first band material 101 and the second band material 102 that make up the cylindrical structure 100A. Therefore, the tip holding member 109 rotates together with the cylindrical structure 100A. In order to obtain a non-rotating tip acting portion at the upper end of the cylindrical structure 100A, a tip acting member 109b that is rotatably attached to the tip holding member 109 via a bearing member 109a may be provided, as in the illustrated example.

[0024] Continuing to refer to FIG. 1, a prime mover 110 such as an electric motor is fixed to the base 103. A rotating shaft of the prime mover 110 is fixed to a pulley 111, and a drive belt 112 such as a toothed belt is stretched between the pulley 111 and the cylindrical structure 100A. The portion of the drive belt 112 stretched over the cylindrical structure 100A is a portion of the inner guide member 104 that protrudes upward beyond the upper end of the outer cylindrical wall 105. As a result, the driven portions of the first and second band materials 101 and 102 driven by the drive belt 112 are supported from the inside by the inner guide member 104, and therefore, the driving force can be transmitted from the drive belt 112 to the cylindrical structure 100A without any hindrance.

[0025] In the spiral advancing / retreating actuator 100 of the present embodiment described above, the rotational output of the prime mover 110 is transmitted to the cylindrical structure 100A via the pulley 111 and the drive belt 112, thereby driving the cylindrical structure 100A to rotate about the axis 100X. Meanwhile, the web guide means consisting of the inner guide member 104 and the outer cylindrical wall 105 is fixed to the base 103, so that when the cylindrical structure 100A is driven to rotate, the separated portions of the first web material 101 and the second web material 102 arranged in the first storage chamber 107a and the second storage chamber 108a are wound up by the web guide means to form a cylindrical configuration, or conversely, the cylindrical portions of the first web material 101 and the second web material 102 that form the cylindrical structure 100A are unwound by the web guide means to form a separated configuration. Then, as the separated portions of first web material 101 and second web material 102 transition to a cylindrical configuration, tubular structure 100A elongates and tip holding member 109 is unwound upward. On the other hand, as the separated portions transition to a separated state, tubular structure 100A shortens and tip holding member 109 retracts downward.

[0026] In this embodiment, the first band material 101 and the second band material 102 in the tubular structure 100A partially overlap in the axial direction, and this overlapping state is maintained by an engagement structure, thereby making it possible to increase the rigidity of the tubular structure 100A while ensuring the flexibility of the first band material 101 and the second band material 102.

[0027] The preferred embodiment of the present disclosure has been described above, and the above embodiment has the following features.

[0028] That is, as shown in Figures 1 and 2, the spiral forward / backward actuating device 100 includes a first strip 101 having engagement pins 101a (first engagement structure) and engagement pins 101b (first engagement structure) along the extension direction at the upper edge portion and the lower edge portion, respectively, a second strip 102 having engagement holes 102a (second engagement structure) and engagement holes 102b (second engagement structure) along the extension direction at the upper edge portion and the lower edge portion, respectively, which are configured to be engageable with and disengageable from the engagement pins 101a and 101b, an inner guide member 104 and an outer tube wall 105 as strip guide means, and a strip storage container 106. The first band material 101 and the second band material 102 are spirally wound around a common axis 100X while being offset from each other in the direction of the axis 100X, and the inner surface of the upper edge portion of the first band material 101 and the outer surface of the lower edge portion of the second band material 102 partially overlap in the direction of the axis 100X, and the inner surface of the lower edge portion of the first band material 101 and the outer surface of the upper edge portion of the second band material 102 partially overlap in the direction of the axis 100X. An engagement pin 101a on the upper edge side of the first web material 101 and an engagement hole 102b on the lower edge side of the second web material 102 engage with each other in a manner that locks the first web material 101 and the second web material 102 in the overlapping surface direction, and an engagement pin 101b on the lower edge side of the first web material 101 and an engagement hole 102a on the upper edge side of the second web material 102 engage with each other in a manner that locks the first web material 101 and the second web material 102 in the overlapping surface direction, thereby forming a cylindrical structure 100A. An inner guide member 104 and an outer cylindrical wall 105 (web material guide means) guide the first web material 101 and the second web material 102 in a spiral shape and are configured to be able to transition between a separated state in which the first web material 101 and the second web material 102 are separated from each other and a cylindrical configuration state that forms the cylindrical structure 100A. The strip storage container 106 has a first storage chamber 107a for storing the first strip 101 in a spiral shape after transitioning from a cylindrical state to a separated state, and a second storage chamber 108a for storing the second strip 102 in a spiral shape after transitioning from a cylindrical state to a separated state. An inner bottom surface 107c of the first storage chamber 107a and an inner bottom surface 108c of the second storage chamber 108a are inclined downward with increasing distance from the axis 100X.According to the above configuration, it is possible to suppress noise that occurs when first band material 101 and second band material 102 transition from a cylindrical configuration state to a separated state.

[0029] In the above embodiment, the inner bottom surface 107c of the first storage chamber 107a and the inner bottom surface 108c of the second storage chamber 108a are inclined downward with increasing distance from the axis 100X. However, instead of this, only one of the inner bottom surface 107c of the first storage chamber 107a and the inner bottom surface 108c of the second storage chamber 108a may be inclined downward with increasing distance from the axis 100X. Even in this case, noise generated when the first band material 101 and the second band material 102 transition from the cylindrical state to the separated state can be suppressed. That is, at least a portion of the noise generated when the first band material 101 and the second band material 102 transition from the cylindrical state to the separated state is suppressed. If the inner bottom surface 107c of the first storage chamber 107a is inclined downward as it moves away from the axis 100X, it goes without saying that the noise generated when the first band material 101 transitions from a cylindrical state to a separated state is suppressed.

[0030] Moreover, the inner bottom surface 107c or the inner bottom surface 108c is inclined downward over the entire surface as it becomes farther away from the axis 100X. According to the above configuration, it is possible to effectively suppress noise generated when the first band material 101 and the second band material 102 transition from the cylindrical state to the separated state.

[0031] However, instead of this, only the radially inner region of the inner bottom surface 107c may be inclined, and the radially outer region of the inner bottom surface 107c may be parallel to the horizontal plane H. Even in this case, it is possible to suppress noise generated when the first band material 101 and the second band material 102 transition from the cylindrical state to the separated state.

[0032] 1 and 4, inner bottom surface 107c or inner bottom surface 108c is inclined so as not to come into contact with the corresponding band material. According to the above configuration, it is possible to reliably suppress noise generated when first band material 101 and second band material 102 transition from a cylindrical state to a separated state.

[0033] 1 and 2, the web guide means includes an inner guide member 104 that spirally guides the first web material 101 and the second web material 102, and an outer tube wall 105 that is disposed on the outer peripheral side of the inner guide member 104 and guides the first web material 101 and the second web material 102 so that the first web material 101 and the second web material 102 can transition between a separated state and a cylindrically-assembled state. The outer tube wall 105 has a first inlet 105b for introducing the first web material 101 from the first storage chamber 107a into the opposing gap G between the inner guide member 104 and the outer tube wall 105, and a second inlet 105c for introducing the second web material 102 from the second storage chamber 108a into the opposing gap G. With the above-described configuration, the web guide means can be realized with a simple configuration.

[0034] 2, both the first introduction port 105b and the second introduction port 105c may extend linearly in parallel to the axis 100X. According to the above configuration, the strip material guiding means can be realized with a simple configuration.

[0035] 1, 2, and 4, inner bottom surface 107c or inner bottom surface 108c is a truncated cone surface. According to the above configuration, the manufacturing cost of strip material storage container 106 can be reduced compared to when inner bottom surface 107c or inner bottom surface 108c is curved in the cross-sectional view shown in FIG.

[0036] 1, 3, and 4, the inclination angle 108t of the inner bottom surface 108c of the second storage chamber 108a at a cross section 108X obtained by cutting the strip storage container 106 along the tangential direction of the second inlet 105c in a plan view is larger than the lead angle 100t of the cylindrical structure 100A. This configuration reliably suppresses noise generated when the second strip 102 transitions from the cylindrical state to the separated state. Similarly, the inclination angle of the inner bottom surface 107c of the first storage chamber 107a at a cross section obtained by cutting the strip storage container 106 along the tangential direction of the outer guide surface 105a in a plan view is larger than the lead angle 100t of the cylindrical structure 100A. This configuration reliably suppresses noise generated when the first strip 101 transitions from the cylindrical state to the separated state.

[0037] Furthermore, the engagement structure for engaging and holding the first band material 101 and the second band material 102 is not limited to the above-mentioned engagement pins 101a and 101b and engagement holes 102a and 102b, but may be anything that can maintain the overlapping state between the first band material 101 and the second band material 102.However, in this embodiment, an engagement structure is provided on the overlapping surface between the first band material 101 and the second band material 102, so that no protrusions are formed on the outer surface of the cylindrical structure 100A, allowing for a compact configuration and ensuring that the first band material 101 and the second band material 102 are securely engaged and held.

[0038] It should be noted that the spiral advance / retreat actuator 100 is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0039] For example, in the cylindrical structure 100A, the first band material 101 and the second band material 102 are fixed in all directions on the overlapping surface by engagement between the engagement pins 101a and 101b and the engagement holes 102a and 102b, but it is sufficient if the first band material 101 and the second band material 102 are held in an overlapping state so that they can be detachably engaged with each other by some kind of engagement structure.

[0040] Furthermore, the engagement state between the first band material 101 and the second band material 102 may be such that they are locked only in one direction within the overlapping plane. For example, a configuration may be adopted in which corresponding concave-convex structures are formed on the inner surface of the first band material 101 and the outer surface of the second band material 102 in the direction of the axis 100X, so that the first band material 101 and the second band material 102 are locked only in the direction of the axis 100X, or a configuration may be adopted in which corresponding concave-convex structures are formed in a direction perpendicular to the axis 100X (a direction circumferential around the axis 100X) or in the extension direction of the first band material 101 and the second band material 102, so that the first band material 101 and the second band material 102 are locked only in the direction perpendicular to the axis 100X or in the extension direction of the band materials.

[0041] Furthermore, although the above-mentioned engagement structure is provided on the overlapping surface between the first strip material 101 and the second strip material 102, it is sufficient that the overlapping state of the first strip material 101 and the second strip material 102 can be maintained, and for example, the structure may be such that it engages at a position away from the overlapping surface.

[0042] Furthermore, the first and second strip materials 101 and 102 are wound and guided spirally between the inner guide member 104 and the outer tube wall 105 that constitute the strip material guide means, but the guide structure may be any structure that guides the first and second strip materials 101 and 102 so that they overlap each other in the axial direction to form a cylindrical structure, and may, for example, be provided with a guide structure in which guide rollers are arranged spirally on at least one of the inside and outside of the spiral shape. [Explanation of symbols]

[0043] 100 Spiral forward / backward actuator 100X axis 100A Cylindrical structure 100t lead angle 101 First Belt 101a Engagement pin 101b Engagement pin 101d lower edge 102 Second Strip 102a Engagement hole 102b Engagement hole 102u upper edge 102d lower edge 103 Foundation 104a Inner guide surface 104 Inner guide member 104b Guide rib 104c Guide groove 105a Outer guideway 105 Outer cylinder wall 105b First entrance 105c 2nd inlet 105d Outer surface 105e External opening 106 Strip material container 107a Containment Cell 1 107 First Containment Vessel 107b Rolling bearings 107c Inner bottom surface 108a Second Containment Cell 108 Second Containment Vessel 108b Rolling bearing 108c inner bottom 108X cutting surface 108t Incline angle 109 Tip holding member 109a Bearing member 109b End acting member 110 Prime Mover 111 Pulley 112 Drive belt G Opposite gap H horizontal plane

Claims

1. a first band material having first engagement structures at an upper edge portion and a lower edge portion along an extension direction; a second band material having second engagement structures configured to be engageable with and disengaged from the first engagement structures at an upper edge portion and a lower edge portion along the extension direction; a strip guide means; a strip material storage container; Including, a cylindrical structure is formed in which the first and second band materials are spirally wound around a common axis while being offset from each other in the direction of the axis, such that an inner surface of the upper edge portion of the first band material and an outer surface of the lower edge portion of the second band material partially overlap in the direction of the axis, and an inner surface of the lower edge portion of the first band material and an outer surface of the upper edge portion of the second band material partially overlap in the direction of the axis, the first engagement structure of the upper edge portion of the first band material and the second engagement structure of the lower edge portion of the second band material engage with each other in a manner to lock the first and second band materials in the overlapping surface direction, and the first engagement structure of the lower edge portion of the first band material and the second engagement structure of the upper edge portion of the second band material engage with each other in a manner to lock the first and second band materials in the overlapping surface direction, the web guide means is configured to guide the first web material and the second web material in a spiral shape, and to be capable of transitioning between a separated state in which the first web material and the second web material are separated from each other and a tubular structure state in which the tubular structure is formed; The band material storage container has a first storage chamber that stores, in a spiral shape, the first band material that has transitioned from the cylindrical state to the separated state, and a second storage chamber that stores, in a spiral shape, the second band material that has transitioned from the cylindrical state to the separated state, an inner bottom surface of at least one of the first storage chamber and the second storage chamber is inclined downward as it becomes farther away from the axis; Spiral forward / backward actuator.

2. The inner bottom surface is inclined so as not to come into contact with the corresponding strip material. The spiral advance / retract actuator according to claim 1 .

3. The strip guide means is an inner guide member that spirally guides the first and second strip materials; an outer tube wall disposed on the outer peripheral side of the inner guide member and guiding the first and second band materials so that the first and second band materials can be moved between the separated state and the tube-configured state; Including, The outer cylinder wall has a first inlet for introducing the first strip material from the first storage chamber into the opposing gap between the inner guide member and the outer cylinder wall, and a second inlet for introducing the second strip material from the second storage chamber into the opposing gap. The spiral advance / retract actuator according to claim 1 .

4. The first inlet and the second inlet both extend linearly parallel to the axis. The spiral advance / retract actuator according to claim 3 .

5. The inclination angle of the inner bottom surface of the first storage chamber in a cross section obtained by cutting the strip storage container along a tangential direction of the first inlet in a plan view is larger than the lead angle of the cylindrical structure, or an inclination angle of the inner bottom surface of the second storage chamber in a cross section obtained by cutting the strip storage container along a tangential direction of the second inlet in a plan view is larger than a lead angle of the cylindrical structure; The spiral advance / retract actuator according to claim 3 .

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