CN107314351B

CN107314351B - Lifting device

Info

Publication number: CN107314351B
Application number: CN201710704128.XA
Authority: CN
Inventors: 谏山喜由
Original assignee: Isa Co Ltd
Current assignee: Isa Co Ltd
Priority date: 2017-07-18
Filing date: 2017-08-17
Publication date: 2019-12-17
Anticipated expiration: 2037-08-17
Also published as: JP2019018968A; JP6516798B2; CN107314351A; CN207132298U

Abstract

The invention provides a lifting device of a reel with a built-in motor. A lifting device for lifting an object to be lifted is provided with: a spool having a hollow structure, the spool having a short-direction first surface provided with a first bearing; a motor provided inside the spool, having a first rotation shaft extending substantially parallel to a longitudinal direction of the spool, the first rotation shaft being connected to the first bearing; and a support part which is fixed to and supports the motor, rotates the first surface by the rotation of the first rotation shaft, rotates the reel around the axis of the surface in the short direction in conjunction with the rotation of the first surface, and winds the reel line on which the object to be lifted is mounted.

Description

Lifting device

Technical Field

The present invention relates to a lifting device for lifting an object to be lifted, and more particularly, to a lifting device including a motor-driven reel having a built-in motor.

Background

a stage lighting device is used in stage performance for supporting performer performance works such as theatrical performances and dances. As described in japanese patent No. 5173231, there is an illumination device that performs stage performance by controlling the elevation and the light amount of an illumination element. The lighting device has a lighting lifting device for lifting the lighting element connected to the winding axis by winding and unwinding the lighting element onto and from the winding shaft. The stereoscopic rendering is performed by controlling with software the length of the reel line connecting the illumination lifting device and the illumination element and the amount of light of the illumination element to change with time.

The lighting elevating device is equipped with a motor, a reel, and a rotary encoder (hereinafter referred to as "encoder"). The motor drives the reel, and the reel is rotated by the driving, thereby controlling the length of the reel axis. The encoder outputs two-phase pulse signals in linkage with the rotation of the motor, and the two-phase pulse signals are used for calculating the lifting movement amount of the lighting element. Since the lighting elevating device is suspended on a ceiling or the like, an observer of the stage performance can see the lighting elevating device. Therefore, the motor, the reel, and the encoder are housed inside the housing of the lighting elevating device so as not to impair the aesthetic feeling felt by the viewer.

Disclosure of Invention

Problems to be solved by the invention

In the above-described stereoscopic rendering, a plurality of lighting elements may be used to provide various rendering effects. This means that a plurality of lighting elevating devices are hoisted on a ceiling or the like. Therefore, in consideration of the load on the ceiling, the lighting elevating device is desired to be lighter in weight. Further, in consideration of the aesthetic feeling felt by the viewer, it is desired that the lighting elevating device be more compact.

The present invention has been made in view of the above problems, and an object thereof is to provide a lifting device which lifts an object to be lifted and is equipped with a motor-driven reel having a built-in motor.

Means for solving the problems

In order to solve the above problem, a lifting device according to the present invention is a lifting device for lifting an object to be lifted, the lifting device including: a reel that is a hollow reel having a first face in a short direction provided with a first bearing; a motor provided inside the spool and having a first rotation shaft extending substantially parallel to a longitudinal direction of the spool; the first rotating shaft is connected with the first bearing; and a support portion that fixes and supports the motor, rotates the first surface by the rotation of the first rotation shaft, rotates the reel about an axis of the short-direction surface in conjunction with the rotation of the first surface, and winds a reel line on which the object to be lifted is mounted.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the structure of the lifting device related to the present invention, the size and weight of the lifting device can be reduced and the lifting device can be miniaturized by the structure of the reel.

Drawings

Fig. 1 is a diagram showing an example of the structure of a stage performance apparatus including a lifting device according to an embodiment of the present invention.

Fig. 2 is a diagram showing an example of the structure of a lifting device according to the related art.

Fig. 3 is a view showing an example of the structure of the lifting device using a motor-driven reel according to the first embodiment of the present invention.

Fig. 4 is a diagram showing an example of an internal structure of a motor-driven reel according to a first embodiment of the present invention, fig. 4(a) is a diagram showing a state in which a cylindrical portion is detached from the reel, and fig. 4(b) is a diagram showing a state in which the cylindrical portion 11a is joined to a fitting portion.

Fig. 5 is a view showing an example of an internal structure of a motor-driven reel according to a first embodiment of the present invention.

Fig. 6 is a view showing an example of the structure of a lifting device using a motor to drive a reel according to a second embodiment of the present invention.

Fig. 7 is a view showing an example of an internal structure of a motor-driven reel according to a second embodiment of the present invention.

fig. 8 is a view showing an example of an internal structure of a motor-driven reel according to a second embodiment of the present invention.

Detailed Description

Hereinafter, the lifting device according to the present invention will be described with reference to the accompanying drawings. The lifting device according to the invention is equipped with a reel with a built-in motor. In an apparatus for performing stage performance (stage performance apparatus), a lifting device is hoisted to a ceiling or the like in a state where a longitudinal direction is vertical, and is used for lifting an object to be lifted. In the lifting device, a motor drives a reel to rotate by driving of the motor, and the reel wire is wound and unwound by the rotation, thereby lifting and lowering the object to be lifted and lowered mounted on the reel axis. The motor-driven reel is disposed inside the lifting device substantially parallel to the longitudinal direction, with the longitudinal direction being the longitudinal direction.

In the present specification, the terms "above", "upper end" and "upper surface" mean above, upper end and upper surface of a lifting device which is vertically hoisted in the longitudinal direction with reference to the ground or a motor-driven reel which is vertically installed in the longitudinal direction, respectively. Similarly, the terms "below", "lower end" and "lower surface" mean the lower, lower end and lower surface of a lifting device that is vertically hoisted in the longitudinal direction or a motor-driven reel that is vertically installed in the longitudinal direction with reference to the ground.

fig. 1 is a diagram showing an example of the structure of a stage performance apparatus including a lifting device according to an embodiment of the present invention. Stage elevating gear includes: a lifting device 1, a boom 2, a lighting element 3, and a control device 4. As shown in fig. 1, the upper end of the lifting device 1 is connected to a boom 2, and is hoisted to the boom 2 with the longitudinal direction being set as the longitudinal direction. The lifting device 1 rotates the reel by a motor provided inside, winds the reel axis on which the lighting element 3 is mounted on the reel and unwinds the reel axis from the reel, and thereby lifts and lowers the lighting element 3. The raising and lowering of the lighting element 3 is controlled by executing a program by a control device 4 connected to the raising and lowering device 1.

The boom 2 is a stage mechanism for lifting the lifting device 1, has a socket box in which a power connector for connection is incorporated, and is installed on the ceiling of the stage. Since the boom 2 according to the present embodiment is well known, a detailed description thereof will be omitted. Instead of being connected to the boom 2, the lifting device 1 may be directly suspended to a ceiling or the like.

The illumination element 3 is a light source that irradiates light with a light amount according to an instruction of the control device 4. The lighting element 3 is connected to the reel line and suspended below the lifting device 1. The illumination element 3 is an illumination element having an arbitrary shape, and a halogen lamp, an LED (light emitting diode), or the like is used. In view of the load applied to the boom 2, it is desirable that the lighting element 3 is more lightweight. Since the illumination element 3 according to the present embodiment is also well known, a more detailed description thereof will be omitted. In the present embodiment, an example in which the illumination element 3 is lifted and lowered by the lifting device 1 is described, but the object to be lifted may be not only the illumination element but also an object to be lifted and lowered in an arbitrary shape.

the control device 4 is a device having a control circuit assembled from a CPU (central processing unit), an FPGA (field programmable gate array), or the like, and executes a program set in advance according to the stage performance. The control device 4 transmits a control signal to each of the one or more lifting devices 1 to control the respective lifting operation. Likewise, a control signal is sent for each of one or more lighting elements 3, controlling the respective amount of light. The control device 4 has a counter that adds a predetermined number to the timing of falling (or rising) of the pulse signal from the detection unit 14 described later.

Next, an example of the structure of the lifting device 1 according to the related art will be described with reference to fig. 2. The lifting device 1 is equipped with: frame 10, reel 11, reel line 12, motor 13, detection unit 14, bearing 15, bearing 16, reel support unit 17, reel support unit 18, mounting unit 19, and mounting hook 20.

The housing 10 includes an upper housing 10a and a lower housing 10b each having a rectangular parallelepiped shape, and the entire housing 10 has a cavity structure capable of accommodating components such as the reel 11. The upper housing 10a is fixed, and the lower housing 10b has an openable and closable structure. The lifting device 1 shown in fig. 1 covers the components such as the reel 11 in a state where the lower housing 10b is closed. When performing a stage performance, the lower housing 10b is used in a closed state. The lifting device 1 shown in fig. 2 is an upper body in which a lower housing 10b is opened, and various components such as a reel 11 are exposed. With this openable and closable structure, maintenance work of each component provided inside the lifting device 1 can be easily performed. In order to reduce the weight of the lifting device 1, the frame 10 may be made of a lightweight material such as plastic or resin.

The reel 11 has a cylindrical shape, and the longitudinal direction thereof is arranged substantially parallel to the longitudinal direction of the housing 10. The reel 11 is rotated about the axis of the short-direction surface by driving of a motor 13. The reel line 12 is wound in one layer by the rotation of the reel 11, and the reel axis 12 is unwound by the reverse rotation thereof. In order to reduce the weight of the lifting device 1, the reel 11 may be made of a lightweight material such as aluminum.

The roll axis 12 has a connector 12a at the end, via which connector 12a the lighting element 3 is mounted. The winding axis 12 protrudes downward from the lower portion of the lifting device 1. That is, the illumination element 3 attached to the tip end of the roll axis 12 is hoisted to below the lifting device 1.

The motor 13 is provided at an upper portion of the spool 11. A rotation shaft (not shown) extends substantially vertically downward from the center of the lower surface of the motor 13, and the detection unit 14 and the spool 11 are interlocked with the rotation shaft. That is, the spool 11 and the detection unit 14 are rotated about the axis of the short-direction surface by driving the motor 13. A cable for supplying electric power to the motor 13, and transmitting a control signal or the like that controls the driving of the motor 13 is mounted on the body of the motor 13.

The detection unit 14 is provided above the spool 11, is located below the motor 13, i.e., between the spool 11 and the motor 13, and detects the amount of rotation of the motor 13 (spool 11). In the present embodiment, the detection unit 14 is assembled from an encoder that rotates in conjunction with the rotation of the motor 13. The detection unit 14 includes: a light emitting element, a lens, a code wheel and a light receiving element. The light emitting element and the like are provided with a cable for supplying power to the light emitting element and transmitting a control signal.

A bearing is provided at the center of the cross section of the encoder disk of the detection unit 14, and the bearing is connected to a rotating shaft extending downward from the main body of the motor 13, whereby the encoder disk is rotated by the driving of the motor 13. As described above, the spool 11 is also rotated by the driving of the motor 13, but this means that the rotation shaft extending from the motor 13 extends to the spool 11 through the encoder disk of the detection section 14.

The encoder disk has a plurality of slits provided at equal intervals and rotates in conjunction with the rotation of the motor 13. When the lens focuses light from the light emitting element and the light is received by the light receiving element through the slit of the encoder disk, the light is processed by a signal conversion circuit (not shown), and finally, two pulse signals of a pulse signal a (a phase) and a pulse signal B (B phase) are output to the control device 4. The controller 4 can calculate the amount of movement of the lighting element 3 that moves up and down by adding a predetermined number to the timing at which the pulse signal changes from the High (High) state to the Low (Low) state (or vice versa).

In addition, the detection unit 14 may be assembled from a contact type or non-contact type encoder that detects the amount of movement of the illumination element 3. In addition, in the lifting device 1, the detection unit 14 is assembled in an incremental two-phase output system having a phase difference of 90 degrees between pulse waves of two systems, but may be assembled in another configuration. For example, there is also an incremental three-phase output device that is assembled to rotate a Z-phase plus one pulse at a time as an origin signal on a two-phase pulse wave. Alternatively, there is also an absolute type assembly in which a code pattern is made unique to each rotational position of the slit and each unique signal can be extracted as it is by a plurality of light receiving elements.

Both the bearing 15 and the bearing 16 function to reduce friction, heat generation, and the like generated by rotation of the spool 11. The bearing 15 is provided on the lower surface of the reel support portion 17, and is coaxial with the rotation shaft of the motor 13 in cooperation with the central axis of the upper surface of the reel 11 in the short direction. The bearing 16 is similarly provided on the upper surface of the reel support portion 18, and is coaxially provided with the rotation shaft of the motor 13 in conjunction with the central axis of the lower surface of the reel 11 in the short direction.

the spool support portion 17 and the spool support portion 18 each have a rectangular plate shape, and their cross sections face each other, and support the bearing 15 and the bearing 16, respectively. That is, the spool 11 is provided between the spool support portion 17 and the spool support portion 18, and rotates about the rotation shaft of the motor 13. The reel support portion 17 and the reel support portion 18 are both immovable members fixed to the inside of the housing 10 by screws or the like. The shapes of the reel support portion 17 and the reel support portion 18 are not limited to the above shapes, and may have any shape.

The mounting portion 19 has a screw type or bolt/nut type structure, and is a member for mounting the lifting device 1 to the boom 2. The lifting device 1 is attached to the boom 2 via the attachment portion 19 and is suspended from the boom 2. The mounting hook 20 has a structure in which the hook and the wire are linked to each other, and functions to prevent the lifting device 1 from falling from the boom 2.

The spool 11, the motor 13, the detection unit 14, the bearing 15, the bearing 16, the spool support unit 17, and the spool support unit 18 are housed inside the housing 10, and are provided so as not to be exposed to the outside in a state where the lower housing 10b is closed. Thus, the structural members are not visible to the viewer for the purpose of realizing a higher visual effect.

As described above, in the lifting device 1 according to the related art, the reel 11, the motor 13, and the detection unit 14 are provided at positions separated from each other inside. Since the spool 11 and the detection unit 14 (encoder disc) are rotated by the driving of the motor 13, even if they are simply provided inside the spool 11, there is a possibility that a cable attached to each of the motor 13 and the detection unit 14 may be wound. Further, since the rotation shaft of the motor 13 rotates, the motor 13 itself may rotate, and as a result, vibration or the like may occur.

< first embodiment >

Next, an example of the structure of the lifting device 1 according to the first embodiment of the present invention will be described with reference to fig. 3. The lifting device 1 according to the first embodiment has the same components as the lifting device 1 described in fig. 2, but the motor 13 is provided inside the spool 11 unlike the related art. The spool 11 is rotated by driving of a motor 13 provided inside, and a code wheel of a detection unit 14 provided below the spool 11 is rotated. In this way, in the lifting device 1 according to the first embodiment, since the motor 13 is provided inside the reel 1, the housing 10 can be downsized to the extent of the size of the motor 13.

Next, an example of the internal structure of the spool 11 will be described with reference to fig. 4. The spool 11 has a structure in which a cylindrical portion 11a constituting a surface around the spool axis 12 can be removed. The reel 11 includes: the cylinder portion 11a, the fitting portion 11b, the motor support portion 11c, the support column 11d, the motor support portion 11e, the coupling portion 11f, the coupling portion 11g, the rotation transmission portion 11h, the support column 11i, and the fitting portion 11 j.

fig. 4(a) shows a state in which the tube portion 11a is detached from the reel 11, and fig. 4(b) shows a state in which the tube portion 11a having a tubular shape is fitted into the fitting portion 11b and the fitting portion 11j (first surface) to integrate them. Fig. 4(a) and 4(b) both show the state in which the spool 11 is laid horizontally, the right side being the upper part of the spool 11 and the left side being the lower part of the spool 11.

As shown in fig. 4(a), the motor 13 is provided inside the spool 11. For example, the motor 13 is assembled by a stepping motor, and a rotation shaft 13a extending downward substantially vertically (extending substantially parallel to the longitudinal direction of the spool 11) is formed at the center of the lower surface thereof. Further, a cable 13b for supplying electric power to the motor 12 is attached to the motor.

The fitting portion 11b and the fitting portion 11j are opposite to each other and rotate coaxially. The fitting portion 11b has a circular plate shape, and has grooves and protrusions formed around its circular cross section, the grooves and protrusions being fitted into the grooves provided in the upper portion of the cylindrical portion 11a and the grooves provided in the inner edge of the upper portion. That is, the fitting portion 11b is fitted to the cylindrical portion 11a, thereby forming the upper surface of the spool 11 in the short direction.

Similarly, the fitting portion 11j has a circular plate shape, and grooves and protrusions are formed around the circular cross section thereof, and the grooves and protrusions are fitted into the recesses provided in the lower portion of the cylindrical portion 11a and the grooves provided in the inner edge of the lower portion. That is, the fitting portion 11j is fitted to the cylindrical portion 11a, thereby forming the lower surface of the spool 11 in the short direction. The groove and the concave portion received by the cylindrical portion 11a, and the groove and the convex portion provided in the fitting portion 11b and the fitting portion 11j, respectively, are merely exemplary structures, and any structure capable of fitting them may be provided.

The motor support portion 11c and the motor support portion 11e face each other, and a stay 11d formed therebetween supports both (fixed by a screw, welding, or the like). The motor 13 is fixed to at least the upper surface of the motor support portion 11e by screws or the like. That is, the motor 13 is a non-movable member fixedly disposed between the motor support portion 11c and the motor support portion 11 e. The motor support portion 11c and the motor support portion 11e have a circular plate shape, but are not limited to this shape, and may have any shape.

The motor support portion 11c and the reel support portion 17 also face each other via the fitting portion 11b and the bearing 15 that are present therebetween. The motor support portion 11c is fixed to the lower surface of the reel support portion 17 by a stay (connecting member) extending from the upper surface. This structure will be described later. The cross section of the motor support portion 11e has an opening provided at the center thereof through which the rotary shaft 13a of the motor 13 passes.

The coupling portion 11f has a concave-convex shape formed downward and a bearing formed at the center of the upper surface. The coupling portion 11g has an upwardly formed uneven shape and an axis formed at the center of the lower surface and extending substantially vertically downward (extending substantially parallel to the longitudinal direction of the spool 11). The rotation transmitting portion 11h has a bearing formed in the center of the upper surface thereof, the bearing being connected to a shaft extending from the joint portion 11 g. The coupling portion 11f and the coupling portion 11g are coupled to each other by fitting of the concave and convex shapes formed in the both.

the bearing of the coupling portion 11f is connected to the rotating shaft 13a of the motor 13. With this configuration, the coupling portion 11f rotates about the axis of the cross section by the rotation of the rotating shaft 13a, and the coupling portion 11g and the rotation transmitting portion 11h rotate coaxially therewith. The shape of the projections and recesses provided in each of the coupling portions 11f and 11g is merely an exemplary shape, and may have any shape that allows them to be fitted.

The rotation transmitting portion 11h and the fitting portion 11j face each other, and a support 11i (connecting member) formed therebetween supports both (fixed by a screw, welding, or the like). A slip ring 21 is provided on the upper surface of the fitting portion 11 j. A cable for transmitting a control signal or the like from the control device 4 is attached to the slip ring 21. The fitting portion 11j rotates about the axis of the cross section in accordance with the rotation of the rotation transmitting portion 11 h. Friction and the like generated by the rotation of the fitting portion 11j are reduced by the bearing 16 provided at the lower portion of the fitting portion 11 j.

When the fitting portion 11j is rotated, the cylinder portion 11a fitted thereto is rotated about the axis of the short-direction surface, and accordingly, the fitting portion 11b fitted to the cylinder portion 11a is also rotated coaxially therewith. That is, only the fitting portion 11j provided with the slip ring 21 is rotated by driving of the motor 13. With this configuration, the cable 13b attached to the motor 13 is not wound, and the reel 11 with the cylindrical portion 11a attached thereto is rotated as a whole as shown in fig. 4(b), whereby the reel wire 12 can be wound and unwound. The shape of the cylindrical portion 11a as viewed in the short direction is not limited to a circle, and may be an arbitrary equilateral triangle such as a square, triangle, pentagon, or hexagon as viewed in the short direction. In this case, at least the fitting portion 11b and the fitting portion 11j have the same shape as the shape viewed from the short direction of the tube portion 11 a.

The detection portion 14 is provided at a lower portion of the reel support portion 18. A shaft extending downward substantially perpendicularly (substantially parallel to the longitudinal direction of the spool 11) is formed at the center of the lower surface of the fitting portion 11 j. The encoder disk 14a of the detection section 14 has a bearing formed in the center of the upper surface, and the bearing is connected to a shaft extending from the fitting section 11 j. That is, the code wheel 14a rotates in conjunction with the rotation of the fitting portion 11 j. Thereby, the rotation amount of the spool 11 can be detected.

The light emitting element 14b is provided opposite to a slit formed on the cross section of the code wheel 14a, and a cable is coupled from the light emitting element 14 b. The light emitting element 14b, a lens not shown in the figure, a light receiving element, and a signal conversion circuit are mounted on a non-movable member (not shown in the figure). With this configuration, only the encoder disk 14a is rotated and the other components such as the light emitting element 14b are fixed in the detection unit 14, so that the rotation amount of the motor 13 can be accurately detected.

Next, an example of the internal structure of the upper portion of the spool 11 will be described with reference to fig. 5. An opening 11e-1 is provided in the center of the cross section of the motor support portion 11e, and a rotary shaft 13a extending downward from the motor 13 passes through the opening 11 e-1. With such a structure, the motor 13 is fixed to the motor support portion 11e, and the bearing of the coupling portion 11f is connected to the rotating shaft 13 a.

A support column 11c-1 and a support column 11c-2 (connecting member) extending upward substantially perpendicularly (extending substantially parallel to the longitudinal direction of the spool 11) are provided from the upper surface of the motor support portion 11c (fixed by screws, welding, or the like). A circular opening 11b-1 is provided at the center of the cross section of the fitting portion 11b, and the support 11c-1 and the support 11c-2 pass through the opening 11 b-1. Similarly, a circular opening 15a is provided in the center of the cross section of the bearing 15, and the support 11c-1 and the support 11c-2 pass through the opening 15 a. That is, the posts 11c-1 and 11c-2 pass through the openings 11b-1 and 15a, respectively.

The support post 11c-1 and the support post 11c-2 are fixed to the lower surface of the reel supporting portion 17 (by screws, welding, or the like). With this configuration, the motor support portion 11c is fixed to the reel support portion 17, and the motor 13 itself can be prevented from rotating and vibrating due to the rotation of the rotating shaft 13 a.

The support columns 11c-1 and 11c-2 have a circular shape on their short side and are disposed at equal intervals at the center of the upper surface of the motor support section 11 c. The diameter A of the outer circumference circle circumscribing the short-side surface of each of the support columns 11c-1 and 11c-2 is not more than the diameter B of the opening 11B-1. Similarly, the diameter a is equal to or less than the diameter C of the opening 15 a. With this structure, the fitting portion 11b rotates so that the inner edge of the opening 11b-1 is along the support column 11c-1 and the support column 11 c-2. Therefore, the support 11c-1 and the support 11c-2 do not interfere with the fitting portion 11b, and the fitting portion 11b can rotate.

The number of the struts provided on the cross section of the motor support portion 11c is not limited, and three or more struts that can form an equilateral triangle may be provided. In this case, the three or more support columns are provided so that the short-direction surfaces thereof are equally spaced apart from the center of the upper surface of the motor support portion 11C, that is, so as to form an equilateral triangle, and the diameter of the outer circle circumscribing the short-direction surfaces thereof is equal to or less than the diameter B and equal to or less than the diameter C.

Alternatively, the strut may be a strut having a short-side surface of any shape. In this case, the pillar has a face in the short direction capable of passing through the formation and size of the opening 11b-1 and the opening 15 a.

The motor 13 is fixed to the motor support portion 11c and the motor support portion 11e as described above. Since the support 11d is provided substantially parallel to the motor 13 in the longitudinal direction, the motor 13 is also supported by the support 11d in the longitudinal direction. With this structure, the motor 13 can be prevented from being vibrated due to the rotation of the rotary shaft 13 a.

the cable 13b attached to the motor 13 passes through the opening 11b-1, the opening 15a, and the opening provided on the cross section of the reel support portion 17. As described above, since the motor 13 is fixed to the motor support portion 11c and the motor support portion 11e and rotation thereof is prevented, it is possible to prevent the cable 13b from being wound by the rotation of the fitting portion 11 b.

In the above, the lifting device according to the first embodiment is explained. According to the lifting device of the first embodiment, since the motor 13 is housed inside the reel 11, the housing 10 can be reduced in size by the size of the motor 13. Further, only the fitting portion 11j is rotated by driving of the motor 13, and the entire spool 11 can be rotated in conjunction with the rotation. Since the bearing provided in the encoder disk 14a of the detection unit 14 is connected to the shaft extending from the fitting unit 11j, the encoder disk 14a can be rotated by the rotation of the rotating shaft 13 c.

On the other hand, the fitting portion 11b is not fixed to either of the reel support portion 17 and the motor support portion 11c, and the motor 13 is supported by the motor support portion 11 c. With this structure, only the spool 11 rotates, and rotation and vibration of the motor 13 inside can be prevented.

In the first embodiment, the motor 13 is provided above the spool 11 and the detection unit 14 is provided below the spool, but the motor 13 may be provided below and the detection unit 14 may be provided above the spool. In this case, all the components are vertically reversed. The motor support portion 11c may be omitted. In this case, the support post 11c-1 and the support post 11c-2 are attached to the motor 13 instead of being attached to the motor support portion 11c, and the motor 13 is directly fixed to the reel support portion 17.

< second embodiment >

Next, an example of the structure of the lifting device 1 according to the second embodiment of the present invention will be described with reference to fig. 6. The lifting device 1 according to the second embodiment has the same components as the lifting device 1 according to the first embodiment, but the detection unit 14 is provided inside the spool 11 in addition to the motor 13. Since the detection unit 14 is also provided inside the reel 11, the housing 10 can be made smaller by the size of the detection unit 14.

Next, an example of the internal structure of the spool 11 will be described with reference to fig. 7. In the second embodiment, only portions different from the inner structure of the spool 11 according to the first embodiment will be described. The reel 11 according to the second embodiment includes the motor support portion 11k and the support 11l in addition to the components described in the first embodiment.

The motor support portion 11k is located between the motor support portion 11c and the motor support portion 11e, and the motor support portion 11c, the motor support portion 11e, and the motor support portion 11k face each other. The motor 13 is fixed between the motor support portion 11k and the motor support portion 11 e. On the other hand, the detection unit 14 is fixed between the motor support unit 11c and the motor support unit 11 k. The support column 11l (connecting member) supports the motor support portion 11c and the motor support portion 11 e. The light emitting element 14b having the detection portion 14 is provided on the support 11 l.

A rotary shaft 13c extending upward substantially perpendicularly (extending substantially parallel to the longitudinal direction of the spool 11) is formed at the center of the upper surface of the motor 13. The rotation shaft 13c rotates coaxially with the rotation shaft 13 a. The cross section of the motor support 11k has an opening provided at the center thereof through which the rotation shaft 13c of the motor 13 passes. The encoder disk 14a of the detection section 14 has a bearing formed in the center of the lower surface, which is connected to a rotary shaft 13c extending from the motor 13. That is, the code wheel 14a is rotated by the driving of the motor 13.

Next, an example of the internal structure of the upper portion of the spool 11 will be described with reference to fig. 8. An opening 11k-1 is provided in the center of the cross section of the motor support portion 11k, and a rotary shaft 13c extending upward from the motor 13 passes through the opening 11 k-1. With this structure, the motor 13 is fixed to the motor support portion 11k, and the bearing of the encoder disk 14a of the detection portion 14 is connected to the rotating shaft 13 c. With this structure, the encoder disk 14a can be rotated by the driving of the motor 13.

The front end of the rotating shaft 13c does not contact at least the motor support portion 11 c. That is, the tip of the rotating shaft 13c does not reach the cross section of the motor support portion 11 c. With this configuration, the motor 13 drives only the encoder disk 14a and does not drive the motor support portion 11c and the like, and therefore, vibration and the like of the motor support portion 11d can be prevented.

The motor support portion 11k is supported by the column 11l together with the motor support portion 11c, and the motor support portion 11k is fixed together with the motor support portion 11c because the motor support portion 11c is fixed to the reel support portion 17. The light emitting element 14b, a lens not shown, a light receiving element, and a signal conversion circuit in the detection unit 14 are fixed and supported by the motor support 11k and the support 11 l. With this configuration, only the encoder disk 14a rotates, and other components such as the light emitting element 14b are fixed, so that the rotation amount of the motor 13 can be accurately detected.

The cable mounted on the light emitting element 14b passes through the opening 11b-1, the opening 15a and the opening provided on the cross section of the reel support portion 17. As described above, since the detection unit 14 is fixed to the motor support unit 11k and the support column 11l and vibration thereof is prevented, it is possible to prevent the cable to which the light emitting element 14b is attached from being entangled due to rotation of the fitting portion 11 b.

In the above, the lifting device according to the second embodiment is explained. According to the lifting device of the second embodiment, since the detection unit 14 is housed inside the reel 11 in addition to the motor 13, the size of the housing 10 can be further reduced to the size of the detection unit 14. Further, since only the encoder disk 14a is rotated by the rotation shaft 13c of the motor 13 and the detection unit 14 is fixed, the rotation and vibration of the motor 13 can be prevented.

In the second embodiment, the motor support portion 11k and the support column 11l may be omitted. In this case, the motor support portion 11c and the motor support portion 11e are supported by the support column 11d, and the motor 13 and the detection portion 14 are provided therebetween. The light emitting element 14b of the detection unit 14 is provided on the support 11 d.

The construction of the lifting device equipped with a reel having a built-in motor described in the above detailed description of the invention is merely exemplary, and the construction may be changed without departing from the concept of the invention. For example, in each of the first and second embodiments, the joint 11f and the joint 11g may be omitted. In this case, the bearing of the rotation transmitting portion 11h is directly connected to the rotating shaft 13a of the motor 13.

Instead of fixing the motor support portion 11c to the reel support portion 17, it may be fixed to any non-movable member such as an inner wall of the housing 10. The non-movable member has at least a surface facing the upper surface of the motor support portion 11c, and the support post 11c-1 and the support post 11c-2 are fixed to the surface. The same applies to the case where the motor support portion 11c is omitted and the support 11c-1 and the support 11c-2 are attached to the motor 13.

Claims

1. A lifting device for lifting an object to be lifted, comprising:

a reel that is a hollow reel having a first surface in a short direction provided with a first bearing;

A motor provided inside the spool, the motor having a first rotation shaft extending substantially parallel to a longitudinal direction of the spool and a second rotation shaft extending in a direction opposite to the first rotation shaft, the first rotation shaft being connected to the first bearing;

A rotary encoder provided inside the spool, detecting a rotation amount of the motor, and having a second bearing hole provided at a center of a cross section, the second bearing hole rotatably supporting the second rotation shaft;

And

A support portion that fixes and supports the motor,

The first surface rotates due to the rotation of the first rotation shaft, and the reel line on which the object to be lifted is mounted is wound by the reel rotating around the axis of the surface in the short direction in conjunction with the rotation of the first surface.

2. The lifting device according to claim 1, wherein the support portion has a connecting member extending substantially parallel to the longitudinal direction,

the connecting member is fixed to a non-movable member provided outside the spool.

3. The lifting device as claimed in claim 1, characterized in that the motor has a connecting member extending substantially parallel to the longitudinal direction,

4. Lifting device as claimed in claim 1 or 2,

And a second face opposed to the first face,

the second surface rotates in conjunction with the rotation of the first surface.

5. Lifting device as claimed in claim 2 or 3,

A second face opposed to the first face and having a centrally disposed opening is also provided,

The connecting member extends through the opening.