Suspension shaft lifting device and suspension shaft height adjustment method

Abstract

To provide a suspension shaft lifting device that allows a suspension shaft to be easily adjusted and installed horizontally.SOLUTION: A suspension shaft lifting device 10 comprises: an upper shaft 110; a suspension shaft 130; a string-like member 150 that suspends the suspension shaft 130; and a rotation mechanism 170 that rotates the upper shaft. A plurality of first pulleys 120 are arranged along a longitudinal direction on the upper shaft 110, and a plurality of second pulleys 140 are arranged along the longitudinal direction on the suspension shaft 130. The string-like member 150 alternately engages with the plurality of first pulleys 120 and the plurality of second pulleys 150 to suspend the suspension shaft 130. The rotation mechanism 170 rotates the upper shaft 110 and the plurality of first pulleys 120 as a unit, thereby winding up or down the string-like member 150 and raising or lowering the suspension shaft 130.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a suspension shaft lifting device and a method for adjusting the height of a suspension shaft. [Background technology]

[0002] Institutional cultivation (housing cultivation) minimizes the influence of external factors such as weather and pest outbreaks, allowing crops to be cultivated stably throughout the year. It is also possible to adjust crop yields, reduce damage from pests and diseases, and reduce the burden of pest control measures in terms of planting area, making it a cropping method with advantages over open-field cultivation.

[0003] In greenhouse cultivation, the location of supplementary light sources for improving yields and pest control light sources for controlling diseases and pests (hereinafter, "supplementary light sources" and "pest control light sources" may be referred to as "auxiliary light sources") is important. Because the light intensity of auxiliary light sources is weak, it is effective to irradiate them from a position close to the crops from the perspective of photosynthesis, etc. On the other hand, during harvesting, pesticide spraying, etc., having the light source near the crops can interfere with the work. Therefore, an auxiliary light source lifting mechanism is known that irradiates light from the auxiliary light source from a position close to the crops during crop growth and can be retracted upward during harvesting, pesticide spraying, etc. (see, for example, Patent Documents 1 and 2).

[0004] Patent Document 1 describes an auxiliary light installed in a greenhouse that is suspended via a lighting lifting mechanism so that its height position can be changed. Figure 10 is a diagram shown to explain the lighting lifting mechanism described in Patent Document 1.

[0005] The lighting lifting mechanism 901 has a wire (string-like member) 950 wound around a drive shaft (upper shaft) 910, and a lighting support bar (suspension shaft) 930 connected to the lower end of the wire 950. By rotating the drive shaft 910 clockwise, the auxiliary lighting (suspended object) 960 connected to the lighting support bar 930 can be lowered, and by rotating the drive shaft 910 counterclockwise, the auxiliary lighting 960 can be raised. As a result, when crops are growing, light from the auxiliary lighting 960 can be irradiated from a position close to the crops, and when work such as harvesting or spraying pesticides is performed, the auxiliary lighting 960 can be retracted upward.

[0006] Similar to Patent Document 1, Patent Document 2 describes a lifting drive system (suspension shaft lifting device) that includes a lighting panel (suspended object) suspended from a panel suspension pipe (suspension shaft) by a panel suspension rope. The panel suspension pipe is lifted by a lifting drive rope (string-like member) via a movable pulley (second pulley), and the lighting panel can be moved between a position close to the crops and a position far from the crops by winding up or down the rope with a DC motor. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-289094 [Patent Document 2] Japanese Patent Application Publication No. 2018-174775 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the lighting lifting mechanisms described in Patent Documents 1 and 2 had the problem that it was not easy to adjust and arrange the auxiliary lighting arranged on the lighting support bar horizontally.

[0009] For example, the panel suspension pipe for suspending the light supplement panel described in Patent Document 2 is arranged in the longitudinal direction of the agricultural greenhouse. For this reason, the panel suspension pipe may be arranged over a length of several tens of meters. In order to arrange a suspension pipe with a length of several tens of meters without bending in the vertical direction, the suspension pipe needs to be suspended by a large number of ropes.

[0010] Furthermore, in order to keep the suspension pipes horizontal, it is necessary to adjust the lengths of the ropes that hang the suspension pipes individually. When suspension pipes are suspended by a large number of ropes, the task of adjusting the lengths of each individual rope is extremely cumbersome.

[0011] The present invention has been made in consideration of the above circumstances, and aims to provide a suspension shaft lifting device that makes it easy to adjust and arrange the suspension shaft on which a suspended object is suspended horizontally.

[0012] Another object of the present invention is to provide a method for adjusting the height of a suspension shaft, which allows a suspension shaft on which a suspended object is suspended to be easily adjusted and installed horizontally. [Means for solving the problem]

[0013] [1] The suspension shaft lifting device of this application example comprises an upper shaft having a longitudinal direction and supported rotatably around a rotation axis along the longitudinal direction, a suspension shaft arranged at a distance from the upper shaft and on which a suspended object is suspended, a string-like member for lifting the suspension shaft, and a rotation mechanism for rotating the upper shaft, wherein the upper shaft has a plurality of first pulleys arranged along the longitudinal direction, the suspension shaft has a plurality of second pulleys arranged along the longitudinal direction, the first pulleys and the second pulleys are arranged in a staggered pattern in the longitudinal direction, the string-like member is alternately engaged with one of the plurality of first pulleys and one of the plurality of second pulleys, and the rotation mechanism rotates the upper shaft and the plurality of first pulleys together to wind up or down the string-like member and raise or lower the suspension shaft.

[0014] [2] In the suspension shaft lifting device of this application example, it is preferable that the multiple first pulleys are arranged in a position such that the string-like members wound up on the upper shaft do not overlap when the upper shaft is rotated to wind up the suspension shaft.

[0015] [3] In the suspension shaft lifting device of this application example, it is preferable that the device further includes a support member that rotatably supports the upper shaft, and that the support member supports the upper shaft at a position intermediate between the position where one of the multiple first pulleys on the upper shaft is arranged and the position where the first pulley arranged next to that first pulley is arranged.

[0016] [4] In the suspension shaft lifting device of this application example, it is preferable that the first pulley has a detachment prevention structure that prevents the string-like member from detaching from the first pulley when the upper shaft and the first pulley are rotated together.

[0017] [5] In the suspension shaft lifting device of this application example, it is preferable that the rotation mechanism includes a speed reducing mechanism having a self-locking function.

[0018] [6] In the suspension shaft lifting device of this application example, it is preferable that the weight of the suspension shaft is greater than the total weight of the suspended object suspended on the suspension shaft.

[0019] [7] In the suspension shaft lifting device of this application example, it is preferable to further include a first fixing member provided on the upper shaft or the suspension shaft to fix one end side of the string-like member, and a second fixing member provided on the upper shaft or the suspension shaft to fix the other end side of the string-like member.

[0020] [8] The suspension shaft lifting device of this application example comprises an upper shaft having a longitudinal direction and supported rotatably around a rotation axis along the longitudinal direction, a suspension shaft arranged at a distance from the upper shaft and on which a suspended object is suspended, a string-like member for lifting the suspension shaft, and a rotation mechanism for rotating the upper shaft, wherein the upper shaft has a plurality of first hook members arranged along the longitudinal direction, the suspension shaft has a plurality of second hook members arranged along the longitudinal direction, the plurality of first hook members and the plurality of second hook members are arranged in a staggered pattern in the longitudinal direction, the string-like member is alternately engaged with the plurality of first hook members and the plurality of second hook members, and the rotation mechanism rotates the upper shaft and the plurality of first hook members together to wind up or wind down the string-like member and raise or lower the suspension shaft.

[0021] [9] The suspension shaft lifting device of this application example comprises an upper shaft having a longitudinal direction and supported rotatably around a rotation axis along the longitudinal direction, a suspension shaft arranged at a distance from the upper shaft and on which a suspended object is suspended, a string-like member for lifting the suspension shaft, and a rotation mechanism for rotating the upper shaft, wherein the upper shaft has a plurality of first hook members arranged along the longitudinal direction, the suspension shaft has a plurality of second pulleys arranged along the longitudinal direction, the first hook members and the second pulleys are arranged in a staggered pattern in the longitudinal direction, the string-like member is alternately engaged with the first hook members and the second pulleys, and the rotation mechanism rotates the upper shaft and the first hook members together to wind up or down the string-like member and raise or lower the suspension shaft.

[0022]

[10] The height adjustment method of the suspension shaft of this application example is a height adjustment method of the suspension shaft provided in the suspension shaft lifting device described in any one of [1] to [7], and comprises the steps of alternately engaging the string-like member with one of the plurality of first pulleys and one of the plurality of second pulleys, fixing one end side of the string-like member to either the upper shaft or the suspension shaft, fixing the other end side of the string-like member to either the upper shaft or the suspension shaft, and pushing up or down a part of the suspension shaft to adjust the horizontality of the suspension shaft.

[0023]

[11] The method for adjusting the height of the suspension shaft in this application example preferably includes a step of adjusting the distance between the upper shaft and the suspension shaft by using the second pulley as a movable pulley and adjusting the length of the central part of the string-like member, which is the part of the string-like member that engages with the first pulley or the second pulley. [Effects of the Invention]

[0024] The suspension shaft lifting device of the present invention comprises an upper shaft having a plurality of first pulleys arranged along its longitudinal direction, a suspension shaft having a plurality of second pulleys arranged along its longitudinal direction, and a string-like member for lifting the suspension shaft. The string-like member is alternately engaged with the plurality of first pulleys and the plurality of second pulleys. The suspension shaft is lifted by a single string-like member via the plurality of first pulleys and the plurality of second pulleys. The position at which the string-like member engages with the first pulley and the position at which the string-like member engages with the second pulley can be freely changed by rotating the first pulley and the second pulley. This makes it easy to adjust the suspension shaft horizontally. According to the present invention, it is possible to provide a suspension shaft lifting device that makes it easy to adjust and install the suspension shaft horizontally.

[0025] The method for adjusting the height of a suspension shaft of the present invention includes a step of engaging a string-like member with a plurality of first pulleys and a plurality of second pulleys. The suspension shaft is lifted by a single string-like member via a plurality of first pulleys and a plurality of second pulleys. The position at which the string-like member engages with the first pulley and the position at which the string-like member engages with the second pulley can be freely changed by rotating the first pulley and the second pulley. The second pulley also functions as a movable pulley. This makes it easy to adjust the suspension shaft horizontally. According to the present invention, it is possible to provide a method for adjusting the height of a suspension shaft that makes it easy to adjust and arrange the height of a suspended object arranged on a suspension shaft horizontally. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a diagram for explaining a suspension shaft lifting device 10 according to an embodiment, showing a state before a suspension shaft 130 is wound up. [Figure 2] FIG. 2 is a diagram for explaining the suspension shaft lifting device 10 according to the embodiment, showing the suspension shaft 130 in a wound up state. [Figure 3] FIG. 3 is a diagram for explaining a first pulley 120 that can be suitably used in the suspension shaft lifting device 10 according to the embodiment. [Figure 4] FIG. 4 is a diagram for explaining a support member 200 that can be suitably used in the suspension shaft lifting device 10 according to the embodiment. [Figure 5] FIG. 5 is a diagram for explaining a fixing member 180 that can be suitably used in the suspension shaft lifting device 10 according to the embodiment. [Figure 6] FIG. 6 is a diagram for explaining a rotation mechanism 170 provided in the suspension shaft lifting device 10 according to the embodiment. [Figure 7] FIG. 7 is a diagram for explaining a second hook member 146 of the suspension shaft lifting device according to the first modification. [Figure 8] FIG. 8 is a view shown to explain the method for adjusting the height of the suspension shaft according to the embodiment. [Figure 9] FIG. 9 is a view shown to explain the method for adjusting the height of the suspension shaft according to the embodiment. [Figure 10] FIG. 10 is a diagram for explaining the illumination lifting mechanism described in Patent Document 1. In FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] A mode for carrying out the present invention (hereinafter referred to as an "embodiment") will be described using as an example a light source lifting device (suspension shaft lifting device 10) that suspends a light source as a suspended object 160 on a suspension shaft 130. The embodiment described below shows a preferred mode for carrying out the invention, and does not limit the invention according to the claims. Furthermore, not all of the elements and combinations thereof described in the embodiment are necessarily essential to the present invention.

[0028] 1. Suspension shaft lifting device First, an overview of a suspension shaft lifting device 10 according to an embodiment will be described using Figures 1 and 2. Figure 1 is a diagram shown to explain the suspension shaft lifting device 10 according to an embodiment, showing a state before the suspension shaft 130 is wound up. Figure 2 is a diagram shown to explain the suspension shaft lifting device 10 according to an embodiment, showing a state after the suspension shaft 130 has been wound up.

[0029] As shown in Figures 1 and 2, the suspension shaft lifting device 10 comprises an upper shaft 110, a plurality of first pulleys 120, a suspension shaft 130, a plurality of second pulleys 140, a string-like member 150, a suspended object 160, a rotation mechanism 170, and a support member 200.

[0030] The upper shaft 110 has a longitudinal direction and is supported by a support member 200 so as to be rotatable around a rotation axis C (see FIG. 3) along the longitudinal direction. A plurality of first pulleys 120 are arranged along the longitudinal direction of the upper shaft 110. The suspension shaft 130 is arranged at an interval relative to the upper shaft 110, and a suspended object 160 is arranged thereon. A plurality of second pulleys 140 are arranged along the longitudinal direction of the suspension shaft 130.

[0031] The plurality of first pulleys 120 and the plurality of second pulleys 140 are arranged in a staggered manner in the longitudinal direction. That is, the first pulleys 120 are arranged on the upper shaft 110, and the second pulleys 140 are arranged on the suspension shaft 130, and the first pulleys 120 and the second pulleys 140 are arranged in the following order in the longitudinal direction: first pulley 120, second pulley 140, first pulley 120, second pulley 140, ... The string-like member 150 is alternately engaged with one of the plurality of first pulleys 120 and one of the plurality of second pulleys 140 to lift the suspension shaft 130.

[0032] The rotation mechanism 170 rotates the upper shaft 110 and the plurality of first pulleys 120 as a unit, thereby winding up or down the string-like member 150 and raising or lowering the suspension shaft 130.

[0033] As shown in FIG. 1, before the suspension shaft 130 is wound up, the suspension shaft 130 is lifted by a single string member 150 via a plurality of first pulleys 120 and a plurality of second pulleys 140. The position at which the string member engages with the first pulley and the position at which the string member engages with the second pulley can be freely changed by rotating the first pulley and the second pulley. This allows the suspension shaft 130 to be adjusted horizontally by pushing up or down a portion of the suspension shaft 130. In other words, the suspension shaft lifting device 10 according to the embodiment makes it easy to adjust and install the suspension shaft 130 horizontally.

[0034] As shown in FIG. 2, the suspension shaft lifting device 10 can raise and lower the suspension shaft 130 by rotating the upper shaft 110 and the multiple first pulleys 120 as a unit using the rotation mechanism 170. That is, the suspension shaft 130 can be disposed at a desired height. As a result, if the suspended object 160 is a light source for growing crops, the light source disposed on the suspension shaft 130 can be disposed close to the crops during crop growth, allowing light from the light source to be irradiated from a position close to the crops. Furthermore, during harvesting, pesticide spraying, and other operations, the suspension shaft 130 can be retracted upward, minimizing the interference of the suspension shaft 130 and the suspended object 160 with the operations.

[0035] The elements that make up the suspension shaft lifting device 10 will be described in detail below.

[0036] The upper shaft 110 is disposed above the suspension shaft 130. A shaft generally refers to a handle or an axis. The upper shaft 110 is an axially shaped member that is supported by the support member 200 so as to be rotatable around a rotation axis C. The cross-sectional shape of the upper shaft 110 is not particularly limited, but is preferably circular, for example. This makes it easy to support the upper shaft 110 rotatably when supported by the support member 200.

[0037] The upper shaft 110 has a plurality of first pulleys 120 arranged along the longitudinal direction. As shown in Fig. 1, in the suspension shaft lifting device 10 before the suspension shaft 130 is wound up, the first pulleys 120 are arranged in a row along the longitudinal direction on the underside of the upper shaft 110, i.e., on the side opposite the suspension shaft 130.

[0038] The number of first pulleys 120 arranged on the upper shaft 110 is not particularly limited as long as it is a plural number equal to or greater than two. The suspension shaft lifting device 10 shown in FIG. 1 illustrates a case in which there are four first pulleys 120, but the number of first pulleys 120 can be set to any number equal to or greater than two. The first pulleys 120 will be described in detail later.

[0039] The upper shaft 110 suspends the suspension shaft 130 by a string-like member 150 engaged with the first pulley 120. The upper shaft 110 is made of a member having a longitudinal direction, such as a metal pipe or a metal rod. The upper shaft 110 may be made by connecting multiple members in the longitudinal direction.

[0040] The upper shaft 110 is supported by a support member (the "support member" may also be referred to as a "connecting member" or "metal") 200 so that it can rotate around a rotation axis C (see Figures 3(a) and 3(b)).

[0041] In the suspension shaft lifting device 10 according to the embodiment, the upper shaft 110 is supported by a plurality of support members 200 fixed at the same height. By supporting the upper shaft 110 by a plurality of support members 200 fixed at the same height, the upper shaft 110 can be supported horizontally.

[0042] Note that the upper shaft 110 only needs to be supported rotatably around the rotation axis C, and does not necessarily need to be supported horizontally. For example, the upper shaft 110 may be supported at a predetermined angle relative to the horizontal. In the suspension shaft lifting device 10, the suspension shaft 130 is lifted by a single string member 150 via a first pulley 120 and a second pulley 140. Therefore, even if the upper shaft 110 is supported at a predetermined angle relative to the horizontal, the suspension shaft 130 can be adjusted and disposed horizontally.

[0043] 4 is a diagram illustrating a support member 200 that can be suitably used in the suspension shaft lifting device 10 according to the embodiment. As shown in FIG. 4, the support member 200 is made of a metal member formed by bending a metal plate. The support member 200 has a hole 202 at one end that rotatably supports the upper shaft 110. The other end of the support member 200 is fixed to a support column 300 by a fixing bracket 205 formed in a U-shape.

[0044] 1 illustrates a case in which the upper shaft 110 is fixed to the support pillars 300 of an agricultural greenhouse. The support pillars 300 are arranged at intervals of 500 mm, and a support member 200 is arranged for every four support pillars 300. In other words, the upper shaft 110 is supported at equal intervals by the support members 200 arranged at intervals of 2000 mm. The intervals between the support pillars 300 and the support members 200 can be set arbitrarily depending on the installation situation.

[0045] When considering the relationship between the position where the support member 200 supports the upper shaft 110 and the position where the first pulley 120 is arranged in the upper shaft 110, the support member 200 supports the upper shaft 110 at a position intermediate between the position where the first pulley 120 is arranged in the upper shaft 110 and the position where the first pulley 120 arranged next to the first pulley 120 is arranged.

[0046] This makes it possible to prevent the wound string member 150 from becoming tangled around the upper shaft 110 when the upper shaft 110 is rotated to wind up the string member 150. Also, the upper shaft 110 can lift the suspension shaft 130 in a well-balanced manner.

[0047] In the above description of the suspension shaft lifting device 10, the support member 200 is fixed to the support column 300 of an agricultural greenhouse. However, the location to which the support member 200 is fixed is not limited to the support column 300 of the agricultural greenhouse. For example, when the suspension shaft lifting device 10 according to the embodiment is installed in a factory that grows vegetables or plants, the support member 200 may be attached to a beam extending along the ceiling or a pillar extending in the vertical direction. Furthermore, when the suspension shaft lifting device 10 according to the embodiment is installed in an outdoor farm field, the support member 200 can be fixed to an appropriate support column.

[0048] 1 and 2, the suspension shaft 130 is disposed below the upper shaft 110 at a distance from the upper shaft 110. As mentioned above, the term "shaft" generally refers to a handle or an axis. The suspension shaft 130 is an axial member on which the suspended object 160 is suspended.

[0049] There are no particular limitations on the cross-sectional shape of the suspension shaft 130. The suspension shaft 140 according to the embodiment has a circular cross-sectional shape, the same as that of the upper shaft 130. This allows the suspension shaft 130 and the upper shaft 110 to share common components.

[0050] Alternatively, the cross-sectional shape of suspension shaft 130 may be rectangular. By configuring suspension shaft 130 to have a rectangular cross-sectional shape, the surface on which suspended object 160 is suspended can be made flat, making it easier to suspend suspended object 160. Furthermore, when suspended object 160 is a light source, the light source can be suspended on one surface of suspension shaft 130, which has a rectangular cross-sectional shape, and the surface opposite to said one surface can be processed into a fin shape, thereby making it possible to dissipate heat generated by the light source.

[0051] The suspension shaft 130 has a plurality of second pulleys 140 arranged along the longitudinal direction. In the suspension shaft lifting device 10 shown in FIG. 1 , the second pulleys 140 are arranged in a row on the upper side of the suspension shaft 130, i.e., on the side opposite the upper shaft 110.

[0052] The number of second pulleys 140 arranged on the suspension shaft 130 is not particularly limited as long as it is a plural number equal to or greater than 2. The suspension shaft lifting device 10 shown in Fig. 1 illustrates a case in which there are three second pulleys 140, but the number of second pulleys 140 can be set to any number equal to or greater than 2.

[0053] 1 and 2, the first pulleys 120 and the second pulleys 140 are arranged in a staggered pattern in the longitudinal direction. That is, the first pulleys 120 are arranged on the upper shaft 110, and the second pulleys 140 are arranged on the suspension shaft 130, and the first pulleys 120 and the second pulleys 140 are arranged in the following order in the longitudinal direction: first pulley 120, second pulley 140, first pulley 120, second pulley 140, ...

[0054] In addition to the light source, the suspension shaft 130 is suspended by a string-like member 150 engaged with a second pulley 140. Similar to the upper shaft 110, the suspension shaft 130 is made of a member having a longitudinal direction, such as a metal pipe or a metal rod. The suspension shaft 130 may be made by connecting a plurality of members in the longitudinal direction.

[0055] A suspended object 160 is suspended from the suspension shaft 130. In the suspension shaft lifting device 10 according to the embodiment, a plurality of light sources are suspended as the suspended object 160 to irradiate crops with light. Examples of the light source include a supplemental light source for improving the yield of crops, a light source for preventing pests and diseases, etc.

[0056] It should be noted that the suspended object 160 is not limited to a light source for irradiating light onto crops. As long as the suspended object 160 can be suspended on the suspension shaft 130, the use of the suspended object 160 and the purpose of suspension do not matter. In other words, the purpose of suspending the suspended object 160 does not matter, whether it is for agricultural purposes or not. Furthermore, it does not matter whether the suspension shaft lifting device 10 is installed indoors or outdoors.

[0057] Examples of the suspended object 160 include equipment, machinery, devices and materials, such as a spraying device for spraying chemicals on crops, and various panels installed indoors and outdoors.

[0058] The weight of the suspension shaft 130 is preferably greater than the total weight of the suspended object 160 suspended by the suspension shaft 130. By configuring the weight of the suspension shaft 130 to be greater than the total weight of the suspended object 160, it is possible to achieve good weight uniformity in the longitudinal direction when the suspension shaft 130 and the suspended object 160 are combined, even if there is an uneven weight distribution at the suspension position of the suspended object 160. As a result, it is possible to provide a suspension shaft lifting device 10 in which the suspension shaft 130 can be adjusted horizontally even more easily.

[0059] If the suspended object 160 has a constant weight and is suspended so that the weight is uniform, it is not essential to configure the weight of the suspension shaft 130 to be greater than the total weight of the suspended object 160 suspended from the suspension shaft 130. This is because the string member 150 is stretched with tension between the first pulley 120 and the second pulley 140, making it easier to adjust the suspension shaft 130 to be horizontal.

[0060] Next, the first pulley 120 and the second pulley 140 will be described. The same pulley can be used for the first pulley 120 and the second pulley 140. For this reason, the first pulley 120 will be described as an example here, and a description of the second pulley 140 will be omitted.

[0061] Figure 3 is a diagram illustrating a first pulley 120 that can be suitably used in the suspension shaft lifting device 10 according to the embodiment. Figure 3(a) is a diagram showing a state in which a string-like member 150 is engaged with the first pulley 120, and Figure 3(b) is a diagram showing a state in which the upper shaft 110 and the first pulley 120 are rotated together to wind up the string-like member 150. Figure 3(c) is a diagram showing a state in which the string-like member 150 is engaged with the first pulley 120, as viewed from the direction in which the rotation axis C extends.

[0062] A string member 150 is engaged with the first pulley 120. The string member 150 is engaged with the first pulley 120, and the suspension shaft 130 is lifted up.

[0063] The first pulley 120 has a groove 120a, flanges 120b provided on both sides of the groove 120a and having a diameter larger than that of the groove 120a, and a structure 122 that rotatably supports the groove 120a and the flanges 120b (see FIG. 3(b)). The string-like member 150 engages with the outer periphery of the groove 120a. The flanges 120b restrict the left-right movement of the string-like member 150, preventing the string-like member 150 from detaching from the first pulley 120 (see FIG. 3(c)).

[0064] The first pulley 120 is fixed to the upper shaft 110 by a U-shaped fixing bracket 125. Since the structural part 122 of the first pulley 120 is fixed to the upper shaft 110, the first pulley 120 rotates integrally with the upper shaft 110 when the upper shaft 110 is rotated around the rotation axis C.

[0065] The first pulley 120 preferably has a "disengagement prevention structure" that prevents the string-like member 150 from coming off the first pulley 120 when the first pulley 120 is rotated integrally with the upper shaft 110. The "disengagement prevention structure" refers to, for example, a structure in which the gap formed between the flange 120b of the first pulley 120 and the structural part 122 is smaller than the thickness of the string-like member 150 (see FIG. 3(c)).

[0066] By forming the gap formed between the flange 120b of the first pulley 120 and the structural part 122 to be smaller than the thickness of the string-like member 150, when the first pulley 120 is rotated integrally with the upper shaft 110 and the string-like member 150 is wound up, it is possible to prevent the string-like member 150 from coming off the first pulley 120 and falling into the gap between the outer periphery of the flange 120b and the structural part 122. This makes it possible to prevent the string-like member 150 from coming off the first pulley 120 (see FIG. 3(b)).

[0067] It is sufficient that the gap formed between the flange 120b of the first pulley 120 and the structural part 122 is at least smaller than the thickness of the string-like member 150, but it is preferable that it is formed small within a range that can prevent contact between the flange 120b of the first pulley 120 and the structural part 122. This makes it possible to more effectively prevent the string-like member 150 from coming off the first pulley 120.

[0068] In addition to the above-described structure, the string-like member 150 may be prevented from coming off by bending the tip of the flange 120b into an L-shape toward the groove 120a.

[0069] A string member 150 is engaged with the second pulley 140. When the string member 150 is engaged with the second pulley 140, the suspension shaft 130 is lifted up by the string member 150.

[0070] The first pulley 120 and the second pulley 140 are arranged in positions where the string-like member 150 wound up on the upper shaft 110 does not overlap when the upper shaft 110 is rotated to wind up the suspension shaft 130.

[0071] As described above, the plurality of first pulleys 120 and the plurality of second pulleys 140 are arranged in a staggered pattern in the longitudinal direction of the upper shaft 110. Therefore, when the upper shaft 110 is rotated to wind up the suspension shaft 130, the string-like member 150 wound up on the upper shaft 110 is wound up in a spiral shape from the position where the first pulley 120 is arranged toward the adjacent first pulley 120, as shown in Figure 3(b).

[0072] At this time, the first pulley 120 and the second pulley 140 are arranged at approximately equal intervals in the longitudinal direction so that the string-like members 150 wound up on the upper shaft 110 do not overlap. This prevents the string-like members 150 wound up on the upper shaft 110 from becoming tangled on the upper shaft 110, allowing the suspension shaft 130 to be wound up or down smoothly.

[0073] The string-like member 150 engages with the first pulleys 120 arranged on the upper shaft 110 and the second pulleys 140 arranged on the suspension shaft 130, thereby lifting the suspension shaft 130. Examples of the string-like member 150 include rope, wire, rubber, etc. The string-like member 150 alternately engages with one of the multiple first pulleys 120 and one of the multiple second pulleys 140. In other words, the string-like member 150 engages with the first pulleys 120 and the second pulleys 140, which are arranged in a staggered pattern in the longitudinal direction, in the order of the first pulley 120, the second pulley 140, the first pulley 120, ...

[0074] By pulling the end side 150a of the string-like member 150, the suspension shaft 130 is lifted up and the distance between the upper shaft 110 and the suspension shaft 130 is adjusted. At this time, the second pulley 140 functions as a movable pulley. Note that, as will be explained in the method for adjusting the height of the suspension shaft described later, after the string-like member 150 is fixed to the upper shaft 110 or the suspension shaft 130, this second pulley also operates as a movable pulley when pushing up or down a part of the suspension shaft to adjust the level of the suspension shaft.

[0075] Here, the region of the string-shaped member 150 that engages with the plurality of first pulleys 120 and the plurality of second pulleys 140 is referred to as the "center portion 150b." Additionally, the regions of the string-shaped member 150 on the end sides of the string-shaped member 150 on both sides of the center portion 150b are referred to as the "end side 150a."

[0076] An end side 150a of the string-like member 150 is fixed to a fixing member 180 disposed on the upper shaft 110 or the suspension shaft 130. The fixing member 180 that fixes the end side 150a of the string-like member 150 to the upper shaft 110 or the suspension shaft 130 will be described below.

[0077] The same fixing member 180 can be used whether it is a fixing member 180 that fixes the end side 150a of the string-like member 150 to the upper shaft 110 or a fixing member 180 that fixes the end side 150a of the string-like member 150 to the suspension shaft 130. Therefore, the fixing member 180 that fixes the end side 150a of the string-like member 150 to the suspension shaft 130 will be described as an example.

[0078] FIG. 5 is a diagram for explaining a fixing member 180 that can be suitably used in the suspension shaft lifting device 10 according to the embodiment.

[0079] 5, the fixing member 180 has a shaft 181 configured to be able to lock the string-like member 150. The string-like member 150 is locked to the shaft 181, and is fixed to the fixing member 180 by connecting an end side 150a of the string-like member 150 with a central portion 150b extending toward the first pulley 120 of the upper shaft 110 of the string-like member 150.

[0080] In addition, although the end side 150a in Figure 5 indicates the end of the string-like member 150, if the string-like member 150 has excess length, the string-like member 150 may be fixed to the fixing member 180 at a position on the end side 150a that is inside the end.

[0081] The fixing member 180 is fixed to the suspension shaft 130 by a U-shaped fixing bracket 182 .

[0082] The end side 150a of the string-like member 150 may be fixed to the upper shaft 110. Alternatively, the end side 150a of the string-like member 150 may be fixed to the suspension shaft 130. Alternatively, one of the end sides 150a of the string-like member 150 may be fixed to the upper shaft 110, and the other of the end sides 150a of the string-like member 150 may be fixed to the suspension shaft 130.

[0083] When the end side 150a of the string-like member 150 is fixed to the suspension shaft 130, the work of fixing the end side 150a of the string-like member 150 to the suspension shaft 130 can be performed at a lower position (closer to the ground) than when the end side 150a of the string-like member 150 is fixed to the upper shaft 110. This improves the efficiency of the work when fixing the end side 150a of the string-like member 150 to the suspension shaft 130.

[0084] The suspension shaft lifting device 10 includes a rotation mechanism 170. The rotation mechanism 170 is connected to an end of the upper shaft 110, and rotates the upper shaft 110 around a rotation axis C. The rotation mechanism 170 also rotates the upper shaft 110 and the multiple first pulleys 120 as a unit, and winds the string-like member 150 around the upper shaft 110. The suspension shaft 130 is raised and lowered by winding up or down the string-like member 150.

[0085] The method of rotating the upper shaft 110 is not limited as long as the rotating mechanism 170 can rotate the upper shaft 110 around the rotation axis C. Examples of the rotating mechanism 170 include a handle connected to the end of the upper shaft 110 directly or via a gear or the like, and an electric motor. The rotating mechanism 170 may also include a speed reduction mechanism that reduces the rotation speed.

[0086] The rotation mechanism 170 may include a rotation direction converter 171 that converts the direction of the rotation axis of the rotational motion. Figure 6 is a diagram for explaining the rotation mechanism 170 included in the suspension shaft lifting device 10 according to the embodiment. The rotation mechanism 170 includes a shaft 172 that extends in a substantially vertical direction, a handle 173 for rotating the shaft 172, and a rotation direction converter 171 that converts rotation of the shaft 172 around the vertical rotation axis into rotation around the rotation axis C of the upper shaft 110.

[0087] As shown in Fig. 6, the shaft 172 and the handle 173 are detachable from the rotation direction changer 171. By removing the shaft 172 and the handle 173 when the upper shaft 110 is not being rotated, it is possible to avoid them interfering with agricultural work, etc.

[0088] The rotation mechanism 170 preferably includes a speed reducing mechanism with a self-locking function. The self-locking function is a function that prevents the upper shaft 110 from rotating even when a force that tends to rotate the upper shaft 110 is applied to the upper shaft 110 due to the weight of the suspension shaft 130 or the like.

[0089] An example of a speed reduction mechanism having a self-locking mechanism is a worm gear consisting of a worm (not shown) connected to the shaft 172 and a worm wheel (not shown) connected to the upper shaft 110 and fitted to the worm. Here, by setting the lead angle of the worm groove small, it becomes difficult to transmit rotation from the worm wheel side to the worm side.

[0090] By providing the rotation mechanism 170 with a speed reducing mechanism having a self-locking function, the suspension shaft 130 can be fixed in a wound-up position without fixing the handle 173 or the like for rotating the shaft 172.

[0091] 2. Variation 1 The above describes the suspension shaft lifting device 10 according to the embodiment, but the first pulley 120 and the second pulley 140 can be replaced with a different configuration as long as the string-like member 150 can move smoothly at the engagement portion with the string-like member 150.

[0092] The suspension shaft lifting device (reference numeral omitted) according to Modification 1 is a suspension shaft lifting device that, compared to the suspension shaft lifting device 10 according to the above-described embodiment, employs a first hook member (reference numeral omitted) instead of the first pulley 120 and a second hook member 146 instead of the second pulley 140. The other configurations are the same as those of the suspension shaft lifting device 10 according to the embodiment.

[0093] Therefore, in the description of the suspension shaft lifting device according to the first modification, differences from the suspension shaft lifting device 10 according to the embodiment will be described, and a description of the same points will be omitted.

[0094] 7 is a diagram showing a second hook member 146 that can be used in place of the second pulley 140 in the suspension shaft lifting device according to Modification 1. The second hook member 146 is formed in a shaft shape so that it can engage with the string-like member 150. The surface of the second hook member 146 is formed smoothly so that when the string-like member 150 is moved while the second hook member 146 and the string-like member 150 are engaged with each other, the string-like member 150 slides over the surface of the second hook member 146 without applying a large force.

[0095] The second hook member 146 is supported by the structural part 142. The structural part 142 is fixed to the suspension shaft 130 by a fixing metal fitting 145 formed in a U-shape.

[0096] The second hook member 146 is not limited to the above-described structure. For example, if a hole through which the string-like member 150 can be inserted is formed and the inner surface of the hole is formed smoothly so that the string-like member 150 can slide through the hole without applying a large force when the string-like member 150 is moved with the string-like member 150 inserted, the second hook member 146 can function.

[0097] The first hooking member that can be used in place of the first pulley 120 can be the same as the second hooking member 146 that can be used in place of the above-described second pulley 140. Therefore, a description thereof will be omitted here.

[0098] In the suspension shaft lifting device according to the first modification, the suspension shaft 130 is lifted by a single string member 150 via a plurality of first hook members and a plurality of second hook members 146. This makes it easy to arrange the suspension shaft 130 horizontally. The suspension shaft lifting device according to the first modification can provide a suspension shaft lifting device 10 that makes it easy to adjust and arrange the suspension shaft 130 horizontally.

[0099] 3. Variation 2 The suspension shaft lifting device (reference numeral omitted) according to Modification 2 is a suspension shaft lifting device that employs a first hook member (reference numeral omitted) instead of the first pulley 120, as compared with the suspension shaft lifting device 10 according to the embodiment described above. The other configurations are the same as those of the suspension shaft lifting device 10 according to the embodiment.

[0100] In the suspension shaft lifting device according to Modification 2, the suspension shaft 130 is lifted by a single string member 150 via a plurality of first hook members and a plurality of second pulleys 140. Furthermore, the suspension shaft lifting device according to Modification 2 is configured to include the second pulley 140, which functions as a movable pulley. This allows the end side 150a of the string member 150 to be pulled to adjust the distance between the upper shaft 110 and the suspension shaft 130 with a small force. Furthermore, after the string member 150 is fixed to the upper shaft 110 or the suspension shaft 130, it becomes easier to push up or down a portion of the suspension shaft 130 to arrange the suspension shaft 130 horizontally. The suspension shaft lifting device according to Modification 2 can provide a suspension shaft lifting device that makes it easy to adjust and arrange the suspension shaft 130 horizontally.

[0101] 4. How to adjust the height of the suspension shaft Next, a method for adjusting the height of the suspension shaft of the suspension shaft lifting device 10 according to the embodiment and a method for manufacturing the suspension shaft lifting device 10 will be described.

[0102] The height adjustment method for the suspension shaft 130 of the suspension shaft lifting device 10 according to the embodiment includes the steps of: engaging the string member 150 with one of the plurality of first pulleys 120 and one of the plurality of second pulleys 140 in order; fixing one end 150a of the string member 150 to either the upper shaft 110 or the suspension shaft 130; and fixing the other end 150a of the string member 150 to either the upper shaft 110 or the suspension shaft 130. and a step of pushing up or down a portion of the suspension shaft 130 to adjust the horizontality of the suspension shaft 130.

[0103] Fig. 8 is a diagram for explaining a method for adjusting the height of a suspension shaft according to an embodiment. Fig. 9 is a diagram for explaining a method for adjusting the height of a suspension shaft according to an embodiment.

[0104] In a manufacturing method of the suspension shaft lifting device 10, as shown in Fig. 8(a), the support member 200 is fixed to the support column 300. The support member 200 is fixed at a position at approximately the same height as the support column 300. Furthermore, it is preferable that the support members 200 are arranged so that the distances to adjacent support members 200 are equal. After the support member 200 is fixed to the support column 300, the upper shaft 110 is rotatably arranged on the support member 200.

[0105] 8(b), the first pulley 120 is attached to the upper shaft 110. The first pulley 120 is preferably disposed at a position midway between the position where the support member 200 is disposed and the position where the support member 200 disposed adjacent to the first pulley 120 is disposed. A string-like member 150 is engaged with the first pulley 120.

[0106] As shown in Fig. 8(c), the string member 150 is sequentially engaged with the first pulley 120 and the second pulley 140. After the string member 150 is engaged with the first pulley 120 and the second pulley 140, the suspension shaft 130 is attached to the second pulley 140 as shown in Fig. 8(d).

[0107] Thereafter, as shown in FIG. 9(a), the end side 150a of the string-like member 150 is pulled to lift the suspension shaft 130 and adjust the distance between the upper shaft 110 and the suspension shaft 130. At this time, the second pulley 140 functions as a movable pulley. Therefore, the suspension shaft 130 can be lifted and the distance adjusted with less force than when lifting without using the first pulley 120, the second pulley 140, and the string-like member 150. At this time, the suspension shaft 130 is not necessarily horizontal. It may be tilted as shown in FIG. 9(a).

[0108] 9(b), one end side 150a of the string-like member 150 is fixed to a fixing member 180 provided on either the upper shaft 110 or the suspension shaft 130. Furthermore, the other end side 150a of the string-like member 150 is fixed to a fixing member 180 provided on either the upper shaft 110 or the suspension shaft 130.

[0109] It is preferable that the end portion 150a of the string-like member 150 is fixed to the suspension shaft 130. This can improve the efficiency of the work when fixing the end portion 150a of the string-like member 150 to the suspension shaft 130.

[0110] 9(c), a portion of the suspension shaft 130 is pushed up or down to adjust the horizontality of the suspension shaft 130. The suspension shaft 130 is suspended by a single string member 150 via a plurality of first pulleys 120 and a plurality of second pulleys 140. Therefore, the second pulley 140 can be used as a movable pulley, making it easy to adjust and install the suspension shaft 130 horizontally.

[0111] Finally, as shown in FIG. 9(d), the suspended object 160 is suspended from the suspension shaft 130.

[0112] The method for adjusting the height of a suspension shaft according to the embodiment includes a step of engaging a string member 150 with a plurality of first pulleys 120 and a plurality of second pulleys 140, alternating between the first pulleys 120 and the second pulleys 140. The suspension shaft 130 is suspended by a single string member 150 via the plurality of first pulleys 120 and the plurality of second pulleys 140, and therefore the suspension shaft 130 can be easily adjusted to a horizontal position by operating the second pulley 140 as a movable pulley. The method for adjusting the height of a light source according to the embodiment can provide a method for adjusting the height of a suspension shaft, which makes it easy to adjust and arrange the suspension shaft 130 to a horizontal position.

[0113] The effects achieved by the suspension shaft lifting device 10 and the light source height adjusting method according to the embodiment will be described below.

[0114] (1) A suspension shaft lifting device 10 according to an embodiment includes an upper shaft 110 having a plurality of first pulleys 120 arranged along the longitudinal direction, a suspension shaft 130 having a plurality of second pulleys 140 arranged along the longitudinal direction, and a string member 150 for lifting the suspension shaft 130. The string member 150 is alternately engaged with the first pulleys 120 and the second pulleys 140. The suspension shaft 130 is lifted by the single string member 150 via the plurality of first pulleys 120 and the plurality of second pulleys 140. The position at which the string member 150 engages with the first pulley 120 and the position at which the string member 150 engages with the second pulley 140 can be freely changed by rotating the first pulley 120 and the second pulley 140. This makes it easy to adjust the suspension shaft 130 to be horizontal. According to the suspension shaft lifting device 10 of the embodiment, it is possible to provide a suspension shaft lifting device 10 in which the suspension shaft 130 can be easily adjusted and arranged horizontally.

[0115] (2) In the suspension shaft lifting device 10 according to the embodiment, the first pulley 120 and the second pulley 140 are disposed in positions where the string-like members 150 wound around the upper shaft 110 do not overlap when the upper shaft 110 is rotated to wind up the suspension shaft 130. This prevents the string-like members 150 wound around the upper shaft 110 from becoming tangled on the upper shaft 110, allowing the suspension shaft 130 to be smoothly wound up or down.

[0116] (3) The suspension shaft lifting device 10 according to the embodiment further includes a support member 200 that rotatably supports the upper shaft 110. The support member 200 supports the upper shaft 110 at a position intermediate between the position on the upper shaft 110 where the first pulley 120 is disposed and the position where a first pulley 120 disposed adjacent to the first pulley 120 is disposed. This prevents the wound-up string member 150 from becoming tangled around the upper shaft 110 when the upper shaft 110 is rotated to wind up the string member 150. Furthermore, the suspension shaft 130 can be lifted in a balanced manner on the upper shaft 110.

[0117] (4) In the suspension shaft lifting device 10 according to the embodiment, the first pulley 120 has a "detachment prevention structure" that prevents the string member 150 from coming off the first pulley 120 when the first pulley 120 is rotated integrally with the upper shaft 110. This makes it possible to more effectively prevent the string member 150 from coming off the first pulley 120.

[0118] (5) In the suspension shaft lifting device 10 according to the embodiment, the rotation mechanism 170 includes a speed reducing mechanism with a self-locking function. This allows the suspension shaft 130 to be fixed in the lifted position without fixing the handle 173 or the like for rotating the shaft 172.

[0119] (6) In the suspension shaft lifting device 10 according to the embodiment, it is preferable that the weight of the suspension shaft 130 is greater than the total weight of the suspended object 160 suspended by the suspension shaft 130. This makes it possible to improve the uniformity of the weight in the longitudinal direction when the suspension shaft 130 and the suspended object 160 are combined. As a result, it is possible to provide a suspension shaft lifting device 10 in which the suspension shaft 130 can be adjusted and installed more easily to be horizontal.

[0120] (7) In the suspension shaft lifting device 10 according to the embodiment, the second pulley 140 is a movable pulley. Because the second pulley 140 functions as a movable pulley, the distance between the upper shaft 110 and the suspension shaft 130 can be adjusted with a small force. Furthermore, because the second pulley 140 operates as a movable pulley, the suspension shaft 130 can be adjusted horizontally simply by pushing up or down a portion of the suspension shaft 130.

[0121] (8) The suspension shaft lifting device 10 according to the embodiment has a first fixing member 180 that is provided on the upper shaft 110 or the suspension shaft 130 and fixes one end 150a of the string-like member 150, and a second fixing member 180 that is provided on the upper shaft 110 or the suspension shaft 130 and fixes the other end 150a of the string-like member 150. This allows the string-like member 150 to be reliably fixed to the upper shaft 110 or the suspension shaft 130.

[0122] (9) A suspension shaft lifting device (reference numeral omitted) according to Modification 1 includes an upper shaft 110 having a plurality of first hook members (reference numeral omitted) arranged along the longitudinal direction, a suspension shaft 130 having a plurality of second hook members 146 arranged along the longitudinal direction, and a string-like member 150 for lifting the suspension shaft 130. The suspension shaft 130 is lifted by a single string-like member 150 via a plurality of first hook members and a plurality of second hook members 146. The position at which the string-like member 150 engages with the first hook member and the position at which the string-like member 150 engages with the second hook member 146 can be freely changed by sliding between the first hook member and the string-like member 150 and between the second hook member 146 and the string-like member 150. This makes it easy to arrange the suspension shaft 130 horizontally. According to the suspension shaft lifting device of the first modification, it is possible to provide a suspension shaft lifting device 10 in which the suspension shaft 130 can be easily adjusted and disposed horizontally.

[0123] (10) A suspension shaft lifting device (reference numeral omitted) according to Modification 2 includes an upper shaft 110 having a plurality of first hook members (reference numeral omitted) arranged along the longitudinal direction, a suspension shaft 130 having a plurality of second pulleys 140 arranged along the longitudinal direction, and a string-like member 150 for lifting the suspension shaft 130. The suspension shaft 130 is lifted by a single string-like member 150 via a plurality of first hook members and a plurality of second pulleys 140. The position at which the string-like member 150 engages with the first hook member and the position at which the string-like member 150 engages with the second pulley 140 can be freely changed by sliding between the first hook member and the string-like member 150 and rotating the second pulley. This makes it easy to arrange the suspension shaft 130 horizontally. This makes it easy to arrange the suspension shaft 130 horizontally. According to the suspension shaft lifting device of the second modification, it is possible to provide a suspension shaft lifting device in which the suspension shaft 130 can be easily adjusted and disposed horizontally.

[0124] (11) The method for adjusting the height of a suspension shaft according to the embodiment includes a step of engaging a string member 150 with a plurality of first pulleys 120 and a plurality of second pulleys 140. The suspension shaft 130 is lifted by a single string member 150 via a plurality of first pulleys 120 and a plurality of second pulleys 140. This makes it easy to arrange the suspension shaft 130 horizontally by utilizing the rotation of the second pulley 140. According to the present invention, it is possible to provide a method for adjusting the height of a suspension shaft that makes it easy to adjust and arrange the suspension shaft 130 horizontally.

[0125] (12) The method for adjusting the height of a suspension shaft according to the embodiment includes a step of adjusting the distance between the upper shaft 110 and the suspension shaft 130 by using the second pulley 140 as a movable pulley and adjusting the length of the central portion 150b of the string-like member 150. By including this step, it is possible to lift the suspension shaft 130 and adjust the distance between the upper shaft 110 and the suspension shaft 130 with a force smaller than when lifting the suspension shaft 130 directly.

[0126] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, it can be used in applications other than agriculture, such as installing light sources in factories or homes as an industrial product, and can also be used to hang equipment and materials other than lighting. [Explanation of symbols]

[0127] 10...Suspension shaft lifting device, 110...Upper shaft, 120...First pulley, 130...Suspension shaft, 140...Second pulley, 146...(Second) hook member, 150...String-like member, 150a...End side of string-like member 150, 160...Suspended object, 170...Pivoting mechanism, 180...Fixed member, 200...Support member, C...Pivoting axis

Claims

1. an upper shaft having a longitudinal direction and supported rotatably around a rotation axis along the longitudinal direction; a suspension shaft disposed at a distance from the upper shaft and on which a suspended object is suspended; a string-like member for lifting the suspension shaft; a rotation mechanism that rotates the upper shaft, The upper shaft has a plurality of first pulleys arranged along the longitudinal direction, the suspension shaft has a plurality of second pulleys arranged along the longitudinal direction; The plurality of first pulleys and the plurality of second pulleys are arranged in a staggered manner in the longitudinal direction, the string-like member is alternately engaged with one of the first pulleys and one of the second pulleys, A suspension shaft lifting device characterized in that the rotating mechanism rotates the upper shaft and the multiple first pulleys as a single unit to wind up or wind down the string-like member and raise or lower the suspension shaft.

2. 2. The suspension shaft lifting device according to claim 1, A suspension shaft lifting device characterized in that the multiple first pulleys are arranged in a position such that the string-like members wound up on the upper shaft do not overlap when the upper shaft is rotated to wind up the suspension shaft.

3. 2. The suspension shaft lifting device according to claim 1, a support member that rotatably supports the upper shaft; A suspension shaft lifting device characterized in that the support member supports the upper shaft at a position intermediate between the position where one of the multiple first pulleys in the upper shaft is arranged and the position where the first pulley arranged next to that first pulley is arranged.

4. 2. The suspension shaft lifting device according to claim 1, A suspension shaft lifting device characterized in that the first pulley has a detachment prevention structure that prevents the string-like member from detaching from the first pulley when the upper shaft and the first pulley are rotated together.

5. 2. The suspension shaft lifting device according to claim 1, A suspension shaft lifting device characterized in that the rotation mechanism is equipped with a speed reduction mechanism having a self-locking function.

6. 2. The suspension shaft lifting device according to claim 1, A suspension shaft lifting device characterized in that the weight of the suspension shaft is greater than the total weight of the suspended object suspended on the suspension shaft.

7. 2. The suspension shaft lifting device according to claim 1, a first fixing member provided on the upper shaft or the suspension shaft and fixing one end side of the string-like member; A suspension shaft lifting device further comprising a second fixing member provided on the upper shaft or the suspension shaft for fixing the other end of the string-like member.

8. an upper shaft having a longitudinal direction and supported rotatably around a rotation axis along the longitudinal direction; a suspension shaft disposed at a distance from the upper shaft and on which a suspended object is suspended; a string-like member for lifting the suspension shaft; a rotation mechanism that rotates the upper shaft, the upper shaft has a plurality of first hook members arranged along the longitudinal direction, the suspension shaft has a plurality of second hook members arranged along the longitudinal direction, The plurality of first hook members and the plurality of second hook members are arranged in a staggered pattern in the longitudinal direction, the string-like member is alternately engaged with the plurality of first hook members and the plurality of second hook members, The lifting device is characterized in that the rotating mechanism rotates the upper shaft and the multiple first hook members as a unit, thereby winding up or winding down the string-like member and raising and lowering the suspension shaft.

9. an upper shaft having a longitudinal direction and supported rotatably around a rotation axis along the longitudinal direction; a suspension shaft disposed at a distance from the upper shaft and on which a suspended object is suspended; a string-like member for lifting the suspension shaft; a rotation mechanism that rotates the upper shaft, the upper shaft has a plurality of first hook members arranged along the longitudinal direction, the suspension shaft has a plurality of second pulleys arranged along the longitudinal direction; The plurality of first hook members and the plurality of second pulleys are arranged in a staggered pattern in the longitudinal direction, the string-like member is alternately engaged with the plurality of first hook members and the plurality of second pulleys, The suspension shaft lifting device is characterized in that the rotation mechanism rotates the upper shaft and the multiple first hook members as a unit, thereby winding up or winding down the string-like member and raising and lowering the suspension shaft.

10. A method for adjusting the height of a suspension shaft provided in the suspension shaft lifting device according to any one of claims 1 to 7, comprising: Alternately engaging the string member with one of the first pulleys and one of the second pulleys; a step of fixing one end side of the string-like member to either the upper shaft or the suspension shaft; a step of fixing the other end of the string-like member to either the upper shaft or the suspension shaft; and a step of pushing up or down a portion of the suspension shaft to adjust the horizontality of the suspension shaft.

11. 12. The method for adjusting the height of a suspension shaft according to claim 11, a step of adjusting the distance between the upper shaft and the suspension shaft by using the second pulley as a movable pulley and adjusting the length of the central portion of the string-like member, which is the portion of the string-like member that engages with the first pulley or the second pulley.

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