Drive transmission device and lifting device including the same

Abstract

[Problem] In a drive transmission device using an endless transmission member such as a belt, two shafts disposed on the same axis in a state in which a gap for insertion of the transmission member is left are connected with a high degree of freedom. [Solution] A drive transmission device (2) is provided with: a reference shaft (20) disposed on a reference axis center (As); a first object shaft (21) and a second object shaft (22) arranged on the object axis (At); a first rotating body (210) attached to the first object shaft (21); a second rotating body (220) attached to the second object shaft (22); a first transmission member (21b) wound around the first rotating body (210); a second transmission member (22b) wound around the second rotating body (220); and a shaft joint (23). The first counterpart shaft (21) and the second counterpart shaft (22) are disposed with a gap therebetween in the axial direction (L), and the first rotating body (210) and the second rotating body (220) are disposed side by side in the axial direction (L) on the counterpart shaft center (At). The shaft joint (23) is connected to the first rotating body (210) and the second rotating body (220).

Description

Technical Field

[0001] The present invention relates to a drive transmission device and a lifting device equipped with the drive transmission device. Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 2004-067348 (Patent Document 1) discloses a substrate transport device for transporting a printed circuit board as an example of a drive transmission device that transmits a driving force generated by a motor.

[0003] In the invention disclosed in Patent Document 1, drive pulleys (14A, 14B) driving conveyor belts (13A, 13B) are connected in a manner of integral rotation using a belt drive shaft (20) and rotate synchronously on the same axis using the rotation of the belt drive shaft (20).

[0004] The belt drive shaft (20) includes a pair of drive shafts (20a, 20b) arranged on the same axis with a gap (25) between them. These drive shafts (20a, 20b) are directly connected via a shaft joint (26). The shaft joint (26) can be removed from the drive shafts (20a, 20b). The gap (25) exposed by removing the shaft joint (26) is used when removing the conveyor belt (13A) from the substrate conveying device (1) during maintenance or the like. That is, by inserting the conveyor belt (13A) through the gap (25), the conveyor belt (13A) can be removed from the substrate conveying device (1). Prior art literature Patent Literature

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-067348 Summary of the Invention Problems to be solved by the invention

[0006] As described above, a pair of drive shafts (20a, 20b) are directly connected via a shaft joint (26). Therefore, in the structure disclosed in Patent Document 1, the size of the shaft joint (26) is restricted by the size and shape of the drive shafts (20a, 20b), which tends to limit the degree of freedom of the shaft connection structure.

[0007] In view of the above-mentioned actual situation, it is desired to realize a technology that can connect two shafts arranged on the same axis with a high degree of freedom in a drive transmission device using an endless transmission member such as a belt, with a gap provided for inserting the transmission member. Technical means to solve the problem

[0008] A drive transmission device comprising: A reference axis, which is arranged on the reference axis center; a first object axis and a second object axis, wherein the first object axis and the second object axis are arranged on an object axis parallel to the reference axis, and the object axis is an axis different from the reference axis; a first reference rotating body and a second reference rotating body, wherein the first reference rotating body and the second reference rotating body are mounted on the reference shaft; a first rotating body mounted on the first object axis; a second rotating body mounted on the second object axis; an annular first transmission member wound around the first reference rotating body and the first rotating body; an annular second transmission member wound around the second reference rotating body and the second rotating body; and a shaft joint for connecting the first object shaft and the second object shaft, The direction parallel to the reference axis and the object axis is defined as the axial direction. The first counterpart axis and the second counterpart axis are arranged with a gap therebetween in the axial direction. The first rotating body and the second rotating body are arranged side by side along the axial direction on the object axis. The shaft joint is connected to the first rotating body and the second rotating body.

[0009] According to this configuration, since the first and second counterpart shafts are arranged with a gap in the axial direction, a gap is formed between the first and second rotating bodies by removing the shaft joint. When replacing the first transmission component or the second transmission component, the first transmission component removed from the first rotating body or the second transmission component removed from the second rotating body can be easily removed through the gap between the first and second counterpart shafts. In addition, according to this configuration, the first and second counterpart shafts can be indirectly connected by connecting the first and second rotating bodies with the shaft joint, rather than directly connecting the first and second counterpart shafts. Therefore, for the shaft joint that performs the function of connecting the first and second counterpart shafts, the restrictions caused by the size and shape of the first and second counterpart shafts can be reduced. Therefore, according to this configuration, the first and second counterpart shafts arranged on the same axis with a gap for inserting the first transmission component or the second transmission component can be connected with a high degree of freedom.

[0010] Further features and advantages of the technology of the present disclosure will become more apparent from the following description of exemplary and non-limiting embodiments described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1This is a diagram showing an example of use of the lifting device. Figure 2 This is a schematic diagram of a drive transmission device. Figure 3 This is a diagram showing a connection structure between a first counterpart axis and a second counterpart axis. Figure 4 This is a diagram showing a connection structure between a first counterpart axis and a second counterpart axis. Figure 5 It is a diagram showing the work flow of disassembling the first transmission member. Figure 6 It is a diagram showing the work flow of disassembling the first transmission member. Figure 7 It is a diagram showing the work flow of disassembling the first transmission member. DETAILED DESCRIPTION

[0012] Hereinafter, embodiments of a drive transmission device and a lifting device including the drive transmission device will be described with reference to the drawings.

[0013] Figure 1 The transport equipment is illustrated. Figure 1 In the example shown, the transport equipment includes a transport vehicle V for transporting articles W. The transport vehicle V includes a travel portion Va that travels along a travel track R and an article holding portion Vb that holds the articles W. The travel track R is arranged at a position separated from the ground and upward, and the transport vehicle V is configured as a so-called ceiling transport vehicle that travels near the ceiling. This type of transport equipment, for example, constitutes a part of a semiconductor manufacturing plant and is used in a clean room that maintains a clean environment. The article W in this case is a substrate storage container (so-called FOUP: Front Opening Unified Pod) that stores substrates (wafers or panels, etc.) or a mask storage container (so-called mask box) that stores masks.

[0014] The lifting device 100 including the drive transmission device 2 is provided in the above-mentioned transport equipment. However, this is merely an example, and the equipment using the drive transmission device 2 and the lifting device 100 including the drive transmission device 2 is not limited to the above-mentioned transport equipment.

[0015] like Figure 1 As shown, a lifting device 100 including a drive transmission device 2 includes a driving source M, a lifting mechanism 1 driven by the driving source M, and a lift target R1 lifted and lowered by the lifting mechanism 1 .

[0016] The drive source M includes a motor and a speed reducer. Although details will be described later, the drive source M is configured to generate a driving force that is transmitted to the drive transmission device 2 .

[0017] In this embodiment, the liftable body R1 is a rail-shaped member supporting the travel portion Va of the transport vehicle V. The liftable body R1 is raised and lowered by the lifting mechanism 1 to change its position between a reference position continuous with the travel rail R and a retreat position separated from the travel rail R.

[0018] The liftable object R1 is positioned at the same height as the travel rails R in the reference position and is positioned below the travel rails R in the retracted position. With the liftable object R1 in the reference position, the transport vehicle V can be transferred from the travel rails R to the liftable object R1. With the transport vehicle V transferred to the liftable object R1, the liftable object R1 is moved from the reference position to the retracted position, whereupon the transport vehicle V is positioned below the travel rails R. The lifting device 100 is used, for example, for maintenance of the transport vehicle V.

[0019] The lifting mechanism 1 includes a first output rotating body 11r, a second output rotating body 12r, a first wound member 11b wound around the first output rotating body 11r and capable of being wound and unwound, and a second wound member 12b wound around the second output rotating body 12r and capable of being wound and unwound.

[0020] The first output rotor 11r and the second output rotor 12r are configured to output the driving force generated by the drive source M to raise and lower the liftable object R1. In this embodiment, a plurality of first output rotors 11r (two in the example shown) are coaxially arranged side by side. Furthermore, a plurality of second output rotors 12r (two in the example shown) are coaxially arranged side by side.

[0021] The first and second output rotating bodies 11r and 12r wind up the first and second wound members 11b and 12b, respectively, to raise the liftable body R1. The first and second wound members 11b and 12b are unwound from the first and second output rotating bodies 11r and 12r, respectively, to lower the liftable body R1. In this embodiment, the first and second wound members 11b and 12b are connected to the liftable body R1 at different locations. This makes it easier to raise and lower the liftable body R1 in a horizontal position.

[0022] The first wound member 11b and the second wound member 12b are formed using, for example, belts. In this case, the first output rotating body 11r and the second output rotating body 12r are formed using pulleys.

[0023] Figure 2 The schematic structure of the drive transmission device 2 is shown. The drive transmission device 2 is configured to transmit driving force via multiple shafts. These multiple shafts are arranged based on two mutually parallel axes. Here, one axis is called the "reference axis As" and the other axis is called the "target axis At."

[0024] Furthermore, a direction parallel to the reference axis As and the target axis At is defined as the “axial direction L.” One side of the axial direction L is defined as the “axial first side L1 ,” and the other side is defined as the “axial second side L2 .”

[0025] like Figure 2 As shown, the drive transmission device 2 includes: a reference shaft 20 arranged on a reference axis As; a first object shaft 21 and a second object shaft 22 arranged on an object axis At parallel to the reference axis As, the object axis At being an axis different from the reference axis As; a first reference rotating body 200A and a second reference rotating body 200B mounted on the reference shaft 20; a first rotating body 210 mounted on the first object shaft 21; a second rotating body 220 mounted on the second object shaft 22; a ring-shaped first transmission component 21b wound around the first reference rotating body 200A and the first rotating body 210; a ring-shaped second transmission component 22b wound around the second reference rotating body 200B and the second rotating body 220; and a shaft joint 23 for connecting the first object shaft 21 and the second object shaft 22.

[0026] In the present embodiment, the reference shaft 20 is connected to the drive source M. The reference shaft 20 is an input shaft for inputting the drive force generated by the drive source M.

[0027] The first reference rotating body 200A and the second reference rotating body 200B are fixed to the same reference shaft 20 and are configured to rotate synchronously with each other. In this embodiment, the first reference rotating body 200A and the second reference rotating body 200B are configured using pulleys.

[0028] The first transmission member 21b, which is wound around the first reference rotating body 200A on the reference axis As, is then wound around the first rotating body 210 on the target axis At. Thus, the driving force input to the reference axis 20 is transmitted to the first rotating body 210 via the first transmission member 21b. In this embodiment, the first transmission member 21b is constructed using a belt. Like the first reference rotating body 200A, the first rotating body 210 is constructed using pulleys.

[0029] The second transmission member 22b, which is wound around the second reference rotating body 200B on the reference axis As, is then wound around the second rotating body 220 on the target axis At. Thus, the driving force input to the reference axis 20 is transmitted to the second rotating body 220 via the second transmission member 22b. In this embodiment, the second transmission member 22b is constructed using a belt. Like the second reference rotating body 200B, the second rotating body 220 is constructed using pulleys.

[0030] The first rotating body 210 and the second rotating body 220 are arranged side by side along the axial direction L on the target axis At. In this example, the first rotating body 210 and the second rotating body 220 are arranged with a gap in the axial direction L. The first rotating body 210 and the second rotating body 220 are mounted on different axes. Specifically, the first rotating body 210 is mounted on the first target axis 21, while the second rotating body 220 is mounted on the second target axis 22.

[0031] The first rotating body 210 is positioned on a first axial side L1 relative to the second rotating body 220. The second rotating body 220 is positioned on a second axial side L2 relative to the first rotating body 210. Specifically, the "first axial side L1" mentioned above can be understood as referring to the side of the first rotating body 210 relative to the second rotating body 220 in the axial direction L. The "second axial side L2" can be understood as referring to the opposite side, i.e., the side of the second rotating body 220 relative to the first rotating body 210 in the axial direction L.

[0032] In this embodiment, the driving force input to the first rotating body 210 via the first transmission member 21 b is transmitted to the first counter shaft 21 , and the driving force input to the second rotating body 220 via the second transmission member 22 b is transmitted to the second counter shaft 22 .

[0033] In this embodiment, the first output rotating body 11r is connected to the first counter shaft 21 so as to rotate in conjunction with the first counter shaft 21. The driving force input from the first rotating body 210 to the first counter shaft 21 is transmitted to the first output rotating body 11r and output to move the object R1 (see FIG. Figure 1 ) is raised and lowered. In addition, the first output rotor 11r may rotate integrally with the first counterpart shaft 21, or may rotate synchronously with the first counterpart shaft 21 at a certain speed ratio.

[0034] In this embodiment, the second output rotating body 12r is connected to the second counter shaft 22 so as to rotate in conjunction with the second counter shaft 22. The driving force input from the second rotating body 220 to the second counter shaft 22 is transmitted to the second output rotating body 12r and output to move the liftable body R1 (see FIG. Figure 1 ) rise and fall. In addition, the second output rotor 12r can rotate integrally with the second counterpart shaft 22, or can rotate synchronously with it at a certain speed ratio.

[0035] In this manner, in the present embodiment, the transmission path of the driving force generated by the driving source M is formed to sequentially pass through the reference shaft 20 , the first and second transmission members 21 b and 22 b , the first and second counterpart shafts 21 and 22 .

[0036] The first and second counterpart shafts 21 and 22 are arranged with a gap in the axial direction L. A shaft joint 23, arranged in this gap, indirectly connects the first and second counterpart shafts 21 and 22. Specifically, the shaft joint 23 is connected to the first and second rotating bodies 210 and 220. Specifically, the shaft joint 23 connects the first and second rotating bodies 210 and 220, respectively, mounted on the first and second counterpart shafts 21 and 22. As a result, the first and second counterpart shafts 21 and 22 are indirectly connected.

[0037] In this way, by fixing the rotating bodies of the first rotating body 210 and the second rotating body 220 to each other, rather than directly fixing the first and second counterpart shafts 21 and 22 to each other, the shafts can be indirectly fixed to each other at a position away from the shaft center (away from the radially outer side). Therefore, the rigidity of the shafts against bending can be easily increased.

[0038] The shaft joint 23 is formed using a coupling having a function of allowing eccentricity or tilting of the first counterpart shaft 21 and the second counterpart shaft 22. However, it is not necessary to have such a function.

[0039] Reference Figure 3 The following figures will explain in detail the connection structure of the first counterpart axis 21 and the second counterpart axis 22. Figure 3 This shows a state in which the first counterpart shaft 21 and the second counterpart shaft 22 are connected (hereinafter simply referred to as “shaft connection state”). Figure 4 In the axially connected state, the first rotating body 210 and the second rotating body 220 are indicated by dotted lines. Figures 5-7 The following shows the work flow for removing the first transmission member 21 b from the drive transmission device 2 .

[0040] like Figure 3 and Figure 4 As shown, in the shaft connection state, a portion of the axial first side L1 of the shaft joint 23 is disposed inside the first rotating body 210. In addition, in the shaft connection state, a portion of the axial second side L2 of the shaft joint 23 is disposed inside the second rotating body 220.

[0041] In the present embodiment, a first recess 210a is provided on the side surface 210Si of the axial second side L2 of the first rotating body 210 (hereinafter referred to as the "first inner side surface 210Si"), which is recessed toward the axial first side L1. A second recess 220a is provided on the side surface 220Si of the axial first side L1 of the second rotating body 220 (hereinafter referred to as the "second inner side surface 220Si"), which is recessed toward the axial second side L2. Then, the shaft joint 23 is configured to fit into both the first recess 210a and the second recess 220a. Thus, in the present embodiment, in the shaft-connected state, a portion of the shaft joint 23 is arranged inside the first rotating body 210 and the second rotating body 220. In addition, with this structure, it is easy to position the shaft joint 23 in the radial direction relative to the first rotating body 210 and the second rotating body 220. In addition, "radial direction" refers to a direction orthogonal to the axial direction L.

[0042] By the above structure, the exposed portion of the shaft joint 23 from the first rotating body 210 and the second rotating body 220 can be reduced, so that the first rotating body 210 and the second rotating body 220 can be easily brought close to each other in the axial direction L. Figure 2 As shown, the first reference rotating body 200A corresponding to the first rotating body 210 and the second reference rotating body 200B corresponding to the second rotating body 220 can be brought closer together in the axial direction L. As a result, the component of the first reference rotating body 200A and the second reference rotating body 200B that is arranged at a position away from the drive source M (in this example, the first reference rotating body 200A) can be brought as close as possible to the drive source M. Therefore, even when the first reference rotating body 200A and the second reference rotating body 200B are pulled by the side (the side of the target axis At) on which the first rotating body 210 and the second rotating body 220 are arranged, deflection of the reference shaft 20 to which the first reference rotating body 200A and the second reference rotating body 200B are attached can be suppressed.

[0043] like Figure 3 and Figure 4 As shown, the first rotating body 210 is fixed to the first object axis 21 by the first fixing mechanism 21f. In the present embodiment, the first fixing mechanism 21f is configured to fix the first rotating body 210 to the first object axis 21 from the radial inside. The first fixing mechanism 21f has a radial configuration portion 21fa configured between the first object axis 21 and the first rotating body 210 in the radial direction. The radial configuration portion 21fa is configured to be able to freely expand and contract in diameter. By expanding the diameter of the radial configuration portion 21fa, the first object axis 21 and the first rotating body 210 are pressed against each other in the radial direction and are fixed. By contracting the diameter of the radial configuration portion 21fa, the fixation of the first object axis 21 and the first rotating body 210 is released. The first rotating body 210 is free to move in the axial direction L along the first object axis 21 when the fixation by the first fixing mechanism 21f is released (refer toFigure 6 ).

[0044] In this example, the first fixing mechanism 21f is constructed using a friction fastener. Examples of friction fasteners include wedge-type fasteners that change the diameter difference between the inner and outer surfaces of the fastened object by inserting a bolt, and hydraulic fasteners that change the diameter difference using oil pressure.

[0045] As described above, the shaft joint 23 is configured to engage with the first recess 210a of the first rotating body 210. Furthermore, in this embodiment, the shaft joint 23 and the first rotating body 210 are fastened together by fasteners B (e.g., bolts). Multiple fasteners B are inserted into the first rotating body 210 from the side surface 210So (hereinafter referred to as the "first outer side surface 210So") on the first axial side L1 of the first rotating body 210, and each fastener B fastens the first rotating body 210 and the shaft joint 23. Each fastener B is threadedly engaged with the portion of the shaft joint 23 that engages with the first recess 210a. Thus, in this embodiment, the first rotating body 210 engages with the shaft joint 23 on the first inner side surface 210Si and is fastened to the shaft joint 23 by the multiple fasteners B inserted from the first outer side surface 210So. Furthermore, each fastener B is inserted into the first rotating body 210 from the first axial side L1 at a position radially outward of the first mating shaft 21.

[0046] The second rotating body 220 is fixed to the second object axis 22 by a second fixing mechanism 22f. In the present embodiment, the second fixing mechanism 22f is configured to fix the second rotating body 220 to the second object axis 22 from the radial inside. The second fixing mechanism 22f has a radial configuration portion 22fa configured between the second object axis 22 and the second rotating body 220 in the radial direction. The radial configuration portion 22fa is configured to be able to freely expand and contract in diameter. By expanding the diameter of the radial configuration portion 22fa, the second object axis 22 and the second rotating body 220 are pressed against each other in the radial direction and are fixed. By contracting the diameter of the radial configuration portion 22fa, the fixation of the second object axis 22 and the second rotating body 220 is released. The second rotating body 220 is free to move in the axial direction L along the second object axis 22 when the fixation by the second fixing mechanism 22f is released (refer to Figure 6 ).

[0047] In this example, the second fixing mechanism 22f is formed using a friction fastener. As the friction fastener, a wedge fastener whose diameter is adjusted by inserting a bolt or a hydraulic fastener whose diameter is adjusted by hydraulic pressure can be used.

[0048] As described above, the shaft joint 23 is configured to engage with the second recess 220a of the second rotating body 220. Furthermore, in this embodiment, the shaft joint 23 and the second rotating body 220 are fastened together by fasteners B (e.g., bolts). Multiple fasteners B are inserted into the second rotating body 220 from the side surface 220So (hereinafter referred to as the "second outer side surface 220So") on the second axial side L2 of the second rotating body 220, and each fastener B fastens the second rotating body 220 and the shaft joint 23. Each fastener B is threadedly engaged with the portion of the shaft joint 23 that engages in the second recess 220a. Thus, in this embodiment, the second rotating body 220 engages with the shaft joint 23 on the second inner side surface 220Si and is fastened to the shaft joint 23 by the multiple fasteners B inserted from the second outer side surface 220So. Furthermore, each fastener B is inserted into the second rotating body 220 from the second axial side L2 at a position radially outward of the second counterpart shaft 22.

[0049] The first and second counterpart shafts 21 and 22 have the connection structure described above. As described above, the first and second counterpart shafts 21 and 22 are arranged with a gap in the axial direction L. However, when the shafts are connected, this gap is covered by the shaft joint 23. Therefore, by releasing the shaft connection and removing the shaft joint 23, the gap between the two shafts is exposed. This gap is utilized when removing the first transmission component 21b or the second transmission component 22b, which are consumables, from the drive transmission device 2. Therefore, this gap is formed to be larger than the width of the first and second transmission components 21b and 22b, respectively.

[0050] Figures 5-7 The following shows the work flow for removing the first transmission member 21b from the drive transmission device 2. Hereinafter, the removal of the first transmission member 21b will be described.

[0051] like Figure 5 As shown, first, the first fixing mechanism 21f is reduced in diameter to release the fixation between the first mating shaft 21 and the first rotating body 210. Then, the plurality of fasteners B are removed from the first rotating body 210. Furthermore, the fixation by the second fixing mechanism 22f is released, and the plurality of fasteners B are removed from the second rotating body 220. In this state, the first rotating body 210 and the second rotating body 220 are connected only by the engagement with the shaft joint 23.

[0052] like Figure 6As shown, the first rotating body 210 and the shaft joint 23 are released, allowing the first rotating body 210 to move axially along the first counterpart axis 21 toward the first side L1. Similarly, the second rotating body 220 and the shaft joint 23 are released, allowing the second rotating body 220 to move axially along the second counterpart axis 22 toward the second side L2. The shaft joint 23, now released from both the first rotating body 210 and the second rotating body 220, is then removed. This exposes a gap between the first counterpart axis 21 and the second counterpart axis 22 in the axial direction L.

[0053] like Figure 7 As shown, the first transmission member 21b is removed from the first rotating body 210. While mounted on the first rotating body 210, the first transmission member 21b is tensioned by a tensioner (not shown). Therefore, before removing the first transmission member 21b from the first rotating body 210, the tension on the first transmission member 21b by the tensioner is released. After removing the first transmission member 21b from the first rotating body 210, the first transmission member 21b is removed from the drive transmission device 2 by passing it through the gap between the first counterpart shaft 21 and the second counterpart shaft 22. This allows the first transmission member 21b to be repaired or replaced.

[0054] While the example of removing the first transmission member 21 b from the drive transmission device 2 has been described above, the same operation as above may be performed when removing the second transmission member 22 b from the drive transmission device 2 .

[0055] [Other embodiments] Next, other embodiments will be described.

[0056] (1) In the above embodiment, an example is described in which the reference shaft 20 is a driving shaft connected to the drive source M, and the first and second counterpart shafts 21 and 22 are driven shafts that follow the rotation of the reference shaft 20. However, the present invention is not limited to this example. The reference shaft 20 may be a driven shaft, and the first and second counterpart shafts 21 and 22 may be driving shafts. In other words, the drive source M may be connected to either the first and second counterpart shafts 21 and 22.

[0057] (2) In the above embodiment, the first rotating body 210 is detachably fixed to the first counterpart shaft 21 by the first fixing mechanism 21f, and the second rotating body 220 is detachably fixed to the second counterpart shaft 22 by the second fixing mechanism 22f. However, the present invention is not limited to this example. The first rotating body 210 and the first counterpart shaft 21 may be integrally formed (non-detachably formed). Alternatively, the second rotating body 220 and the second counterpart shaft 22 may be integrally formed (non-detachably formed).

[0058] (3) In the above embodiment, the first transmission member 21b is configured using a belt, and the first rotating body 210 and the first reference rotating body 200A are configured using pulleys. However, the present invention is not limited to this example. Alternatively, the first transmission member 21b may be configured using a chain, and the first rotating body 210 and the first reference rotating body 200A may be configured using sprockets.

[0059] (4) In the above embodiment, the second transmission member 22b is configured using a belt, and the second rotating body 220 and the second reference rotating body 200B are configured using pulleys. However, the present invention is not limited to this example. Alternatively, the second transmission member 22b may be configured using a chain, and the second rotating body 220 and the second reference rotating body 200B may be configured using sprockets.

[0060] (5) In the above embodiment, the first rotating body 210 and the second rotating body 220 are arranged with a gap in the axial direction L. However, the present invention is not limited to this example, and the first rotating body 210 and the second rotating body 220 may be arranged in contact with each other in the axial direction L.

[0061] (6) In the above embodiment, the shaft joint 23 is connected to both the first rotating body 210 and the second rotating body 220, but is not connected to the first counterpart shaft 21 and the second counterpart shaft 22. However, the shaft joint 23 is not limited to this example, and may be connected to the first counterpart shaft 21 and the second counterpart shaft 22.

[0062] (7) In the above embodiment, the first and second wound members 11b, 12b are configured using belts. However, the present invention is not limited to this example, and at least one of the first and second wound members 11b, 12b may be configured using a wire or a chain.

[0063] (8) In the above embodiment, the drive transmission device 2 is applied to the lifting device 100. However, the present invention is not limited to this example, and the drive transmission device 2 can be applied to various drive devices such as conveyors and transfer devices.

[0064] (9) In the above embodiment, the lifting device 100 is configured as an elevator that lifts and lowers a transport vehicle V via a lift target R1. However, the present invention is not limited to this example. The lifting device 100 may be configured as an elevator mounted on a stacker crane or as an elevator used to lift and lower articles W in an automated warehouse.

[0065] (10) In addition, the configurations disclosed in the above embodiments may be combined with configurations disclosed in other embodiments as long as no contradiction arises. Regarding other configurations, the embodiments disclosed in this specification are merely examples in all respects. Therefore, various modifications may be made as appropriate without departing from the scope of the present disclosure.

[0066] [Summary of this embodiment] Hereinafter, a summary of this embodiment will be described.

[0067] A drive transmission device comprising: A reference axis, which is arranged on the reference axis center; a first object axis and a second object axis, wherein the first object axis and the second object axis are arranged on an object axis parallel to the reference axis, and the object axis is an axis different from the reference axis; a first reference rotating body and a second reference rotating body, wherein the first reference rotating body and the second reference rotating body are mounted on the reference shaft; a first rotating body mounted on the first object axis; a second rotating body mounted on the second object axis; an annular first transmission member wound around the first reference rotating body and the first rotating body; an annular second transmission member wound around the second reference rotating body and the second rotating body; and a shaft joint for connecting the first object shaft and the second object shaft, The direction parallel to the reference axis and the object axis is defined as the axial direction. The first counterpart axis and the second counterpart axis are arranged with a gap therebetween in the axial direction. The first rotating body and the second rotating body are arranged side by side along the axial direction on the object axis. The shaft joint is connected to the first rotating body and the second rotating body.

[0068] According to this configuration, since the first and second counterpart shafts are arranged with a gap in the axial direction, a gap is formed between the first and second rotating bodies by removing the shaft joint. When replacing the first transmission component or the second transmission component, the first transmission component removed from the first rotating body or the second transmission component removed from the second rotating body can be easily removed through the gap between the first and second counterpart shafts. In addition, according to this configuration, the first and second counterpart shafts can be indirectly connected by connecting the first and second rotating bodies with the shaft joint, rather than directly connecting the first and second counterpart shafts. Therefore, for the shaft joint that performs the function of connecting the first and second counterpart shafts, the restrictions caused by the size and shape of the first and second counterpart shafts can be reduced. Therefore, according to this configuration, the first and second counterpart shafts arranged on the same axis with a gap for inserting the first transmission component or the second transmission component can be connected with a high degree of freedom.

[0069] Preferably, the side of the second rotating body in the axial direction on which the first rotating body is disposed is defined as an axial first side, and the opposite side is defined as an axial second side. A first recessed portion is provided on the side surface of the first rotating body on the second axial side so as to be recessed toward the first axial side. A second recessed portion is provided on the side surface of the second rotating body on the first axial side so as to be recessed toward the second axial side. The shaft joint is configured to fit into both the first recess and the second recess.

[0070] Since the shaft joint is engaged with both the first and second recesses in this configuration, the rigidity of the connection between the first and second counterpart shafts by the shaft joint is easily improved. Furthermore, since the shaft joint is easily positioned by the first and second recesses, the workability of connecting the shaft joint to the first and second rotating bodies is easily improved.

[0071] Preferably, the first rotating body is fixed to the first object axis by a first fixing mechanism. The second rotating body is fixed to the second object axis by a second fixing mechanism, The first rotating body is movable in the axial direction along the first counterpart axis when the first fixing mechanism is released. The second rotating body is movable in the axial direction along the second counterpart axis when the second fixing mechanism has released the fixing.

[0072] According to this configuration, the ease of attaching and detaching the shaft joint relative to the first rotating body and the second rotating body is improved, thereby making it easier to attach and detach the first transmission member wound around the first rotating body or the second transmission member wound around the second rotating body.

[0073] A lifting device, provided with the drive transmission device, comprises: driving source; a lifting mechanism driven by the driving source; and The object to be lifted is lifted by the lifting mechanism. The lifting mechanism includes: a first output rotating body, a second output rotating body, a first wound member wound around the first output rotating body and capable of being wound up and unwound, and a second wound member wound around the second output rotating body and capable of being wound up and unwound. The first wound member and the second wound member are connected to the liftable object at different positions. The first output rotating body is connected to the first object shaft so as to rotate in conjunction with the first object shaft. The second output rotating body is connected to the second counterpart shaft so as to rotate in conjunction with the second counterpart shaft.

[0074] According to this configuration, while the object to be lifted is stably suspended by a plurality of wound components, the first output rotating body and the second output rotating body are rotationally driven by the drive source, thereby enabling the object to be lifted or lowered. Furthermore, according to this configuration, the driving force of the drive source can be appropriately transmitted to the first and second object axes, and even if either the first transmission component or the second transmission component breaks or falls off, the driving force of the drive source can be transmitted to both the first and second object axes via the remaining transmission components. Therefore, according to this configuration, the driving force of the drive source can be appropriately transmitted to the object to be lifted, and the object to be lifted or lowered can be reliably lifted or lowered. [Industrial Applicability]

[0075] The technology of the present invention can be applied to a drive transmission device and a lifting device having the drive transmission device. Explanation of symbols

[0076] 100: Lifting device 1: Lifting mechanism 11b: First wound member 11r: First output rotating body 12b: Second wound member 12r: Second output rotating body 2: Drive transmission device 20: Reference axis 21: First object axis 21b: First transmission component 21f: First fixing mechanism 22: Second object axis 22b: Second transmission component 22f: Second fixing mechanism 23: Shaft joint 200A: First reference rotating body 200B: Second reference rotating body 210: First rotating body 210Si: Side 210So: Side 210a: first recess 220: Second rotating body 220Si side view 220So: Side 220a: Second recess M: driving source R1: The object being lifted As: Reference axis At: Object axis L: Axial L1: Axial first side L2: Second axial side.

Claims

1. A drive transmission device, characterized in that: have: A reference axis, which is arranged on the reference axis center; a first object axis and a second object axis, wherein the first object axis and the second object axis are arranged on an object axis parallel to the reference axis, and the object axis is an axis different from the reference axis; a first reference rotating body and a second reference rotating body, wherein the first reference rotating body and the second reference rotating body are mounted on the reference shaft; a first rotating body mounted on the first object axis; a second rotating body mounted on the second object axis; an annular first transmission member wound around the first reference rotating body and the first rotating body; an annular second transmission member wound around the second reference rotating body and the second rotating body; and a shaft joint for connecting the first object shaft and the second object shaft, The direction parallel to the reference axis and the object axis is defined as the axial direction. The first counterpart axis and the second counterpart axis are arranged with a gap therebetween in the axial direction. The first rotating body and the second rotating body are arranged side by side along the axial direction on the axis of the object. The shaft joint is connected to the first rotating body and the second rotating body.

2. The drive transmission device according to claim 1, wherein: The side of the second rotating body in the axial direction where the first rotating body is arranged is defined as an axial first side, and the opposite side is defined as an axial second side. A first recessed portion is provided on the side surface of the first rotating body on the second axial side so as to be recessed toward the first axial side. A second recessed portion is provided on the side surface of the second rotating body on the first axial side so as to be recessed toward the second axial side. The shaft joint is configured to fit into both the first recess and the second recess.

3. The drive transmission device according to claim 1 or 2, characterized in that: The first rotating body is fixed to the first object axis by a first fixing mechanism, The second rotating body is fixed to the second object axis by a second fixing mechanism, The first rotating body is movable in the axial direction along the first counterpart axis when the first fixing mechanism is released. The second rotating body is movable in the axial direction along the second counterpart axis in a state where the fixing by the second fixing mechanism is released.

4. A lifting device comprising the drive transmission device according to claim 1 or 2, characterized in that: have: driving source; a lifting mechanism driven by the driving source; and The object to be lifted is lifted by the lifting mechanism. The lifting mechanism includes: a first output rotating body, a second output rotating body, a first wound member wound around the first output rotating body and configured to be wound and unwound freely, and a second wound member wound around the second output rotating body and configured to be wound and unwound freely. The first wound member and the second wound member are connected to the liftable object at different positions. The first output rotating body is connected to the first object shaft so as to rotate in conjunction with the first object shaft. The second output rotating body is connected to the second counterpart shaft so as to rotate in conjunction with the second counterpart shaft.

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