Aerial suspension conveying line

Abstract

The utility model provides an air suspension conveying line. The air suspension conveying line comprises a first track, a transmission assembly, a driving component, a first connecting component and a second connecting component. The first rail is arranged in the first horizontal direction and provided with a containing cavity with a downward opening. The transmission assembly is connected to the first rail and located in the containing cavity. The driving component is detachably connected to the first rail and is in transmission connection to the transmission assembly. The first connecting member is configured as a plate-like member and is connected to the driving member. The second connecting component is arranged in the second horizontal direction, the second horizontal direction is perpendicular to the first horizontal direction, and the two ends of the second connecting component are connected to the first connecting component and the first rail respectively. According to the aerial suspension conveying line, the driving component is convenient to disassemble and assemble relative to the first track, the maintenance difficulty of the first track and the driving component is reduced, and the use flexibility of the aerial suspension conveying line is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of high-altitude transportation, and more specifically relates to an aerial suspension conveyor line. Background Art

[0002] An overhead conveyor line, also known as a suspended conveyor line or overhead conveyor, is a device that continuously transports materials in space. An overhead conveyor line is generally driven by a motor, allowing components such as trolleys and hangers to operate on an overhead track, thereby completing the transportation of materials. It offers technical advantages such as high flexibility, a small footprint, a strong load-bearing capacity, ease of maintenance, and high safety. Because the motor connected to the track is the primary driving component, it requires frequent disassembly and maintenance, making the assembly and connection of existing driving components to the track relatively complex. Furthermore, a belt-type overhead conveyor line, as a type of overhead conveyor line, combines the features of belt conveying and aerial suspension to achieve continuous and efficient transportation of materials in space. During long-term operation, the belt's tension needs to be effectively adjusted, making existing overhead conveyor lines difficult to operate.

[0003] Therefore, it is necessary to provide an aerial suspension conveyor line to at least partially solve the above problems. Utility Model Content

[0004] The Summary of the Utility Model introduces a series of simplified concepts that will be further described in the Detailed Description of the Utility Model. The Summary of the Utility Model of the Utility Model does not intend to limit the key features and essential technical features of the claimed technical solution, nor does it intend to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above problems, the present invention provides an aerial suspension conveyor line, which comprises:

[0006] a first track, the first track being arranged along a first horizontal direction, and the first track having a receiving cavity opening downward;

[0007] a transmission assembly connected to the first track and located in the accommodating cavity; a driving member detachably connected to the first track, the driving member being transmission-connected to the transmission assembly;

[0008] a first connecting member configured as a plate-shaped member and connected to the driving member;

[0009] The second connecting member is arranged along a second horizontal direction, the second horizontal direction is perpendicular to the first horizontal direction, and two ends of the second connecting member are respectively connected to the first connecting member and the first track.

[0010] Optionally, the first connecting member, the second connecting member and the first track have hole structures with corresponding positions, and the aerial suspension conveyor line also includes a first fastener, which is connected to the hole structure so that the first connecting member and the second connecting member are fixed to the first track.

[0011] Optionally, the transmission assembly includes:

[0012] a transmission member, the transmission member being pivotally connected to the first rail about the second horizontal direction, the transmission members being arranged in pairs, adjacent transmission members being spaced apart along the first horizontal direction, and one end of at least one transmission member being transmission-connected to the driving member;

[0013] a transmission belt configured in a closed shape and wound around the transmission members adjacent to each other in the first horizontal direction so as to follow the transmission members;

[0014] At least one of the transmission components is configured to be movable and adjustable relative to the first track along the first horizontal direction so as to adjust the tension of the transmission belt.

[0015] Optionally,

[0016] The first track is provided with a slide groove, the slide groove passes through the first track along the second horizontal direction, and at least one of the transmission members is configured to be slidably connected to the slide groove along the first horizontal direction;

[0017] The aerial suspension conveyor line also includes:

[0018] a first securing member detachably connected to a top surface of the first rail;

[0019] second fixing members, the second fixing members being provided in pairs, adjacent second fixing members being spaced apart along the second horizontal direction, the second fixing members being vertically connected to the bottom surface of the first fixing member, and the second fixing members being adjustable relative to the first fixing member along the first horizontal direction;

[0020] The transmission member protrudes outward from the sliding groove along the second horizontal direction and is pivotally connected to the second fixing member adjacent to the second horizontal direction about the second horizontal direction.

[0021] Optionally, the second fixing member has a positioning groove running through the second horizontal direction.

[0022] The aerial suspension conveyor line further includes a guide member connected to the positioning groove at the second fixing member adjacent to each other along the second horizontal direction, and a portion of the guide member is located in an inner area of ​​the transmission belt.

[0023] Optionally, the aerial suspension conveyor line further includes a positioning component, and the positioning component includes:

[0024] a first positioning member, the first positioning member being arranged along the second horizontal direction and connected to the first rail, with both ends of the first positioning member protruding outward from the first rail along the second horizontal direction;

[0025] A second positioning member is provided along the first horizontal direction, the second positioning member is configured to be adjustably connected to the first positioning member along the first horizontal direction, and one end of the second positioning member abuts against the second fixing member.

[0026] Optionally,

[0027] The first rail has a first mounting hole penetrating the first rail along the second horizontal direction, and the first positioning member is configured as a rod-shaped member and is inserted into the first mounting hole.

[0028] The first positioning member has a second mounting hole penetrating the first horizontal direction, the second positioning member is passed through the second mounting hole, and both ends of the second positioning member protrude outward from the second mounting hole.

[0029] Optionally,

[0030] The second mounting hole is configured as a threaded hole, and the second positioning member has an external thread suitable for the second mounting hole; or

[0031] The positioning assembly also includes at least one second fastener, which is connected to the second positioning member and abuts against the first positioning member. The second fastener is located on a side of the first positioning member close to the second fixing member along the first horizontal direction to prevent the second positioning member from moving in a direction away from the second fixing member.

[0032] Optionally, the first positioning member portion is located in an inner area of ​​the transmission belt.

[0033] Optionally, the aerial suspension conveyor line further includes a walking trolley, which is movably connected to the first track along the first horizontal direction and protrudes downward from the first track, and the walking trolley includes:

[0034] a vehicle frame, the vehicle frame being located in the accommodating cavity;

[0035] a pressing member movably connected to the frame in a vertical direction between a first position and a second position;

[0036] The pressing member located at the first position abuts against the transmission belt so that the traveling carriage can move along with the transmission belt, and the pressing member located at the second position is disengaged from the transmission belt so that the transmission belt idles.

[0037] According to the aerial suspension conveyor line of the present invention, the driving component can be easily disassembled and assembled relative to the first track, which reduces the difficulty of maintaining the first track and the driving component and improves the flexibility of using the aerial suspension conveyor line. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The following drawings of the embodiments of the present invention are used as part of the present invention to understand the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0039] Figure 1 This is a schematic diagram of an aerial suspension conveyor line according to a preferred embodiment of the present invention, wherein the traveling trolley and the hanging device are omitted;

[0040] Figure 2 for Figure 1 A side view schematic diagram of

[0041] Figure 3 for Figure 1 A schematic diagram of an aerial suspension conveyor line is shown, wherein the second fixing member is omitted;

[0042] Figure 4 for Figure 3 An enlarged schematic diagram of part A in FIG;

[0043] Figure 5 for Figure 1 The schematic diagram of the main view of the overhead suspended conveyor line shown, wherein the structure of part of the first track is omitted by adopting a broken view;

[0044] Figure 6 for Figure 1 A schematic diagram of an overhead suspended conveyor line is shown, wherein the first track is omitted;

[0045] Figure 7 is a schematic diagram of an aerial suspension conveyor line according to a preferred embodiment of the present invention, wherein the first track is omitted; and

[0046] Figure 8 for Figure 7 Schematic diagram of the enlarged portion B.

[0047] Description of reference numerals:

[0048] 1 Aerial Suspension Conveyor Line 11 First Track

[0049] 11a Accommodation cavity 11b Installation slot

[0050] 11c Positioning slot 11d Slide slot

[0051] 12 First fixing member 13 Second fixing member

[0052] 13a Positioning groove 14 Guide member

[0053] 15 first positioning member 16 second positioning member

[0054] 17 Second fastener 18 Positioning assembly

[0055] 21 Transmission assembly 22 Transmission components

[0056] 23 Drive belt 24 Bearing

[0057] 25 Traveling trolley 26 Frame

[0058] 27 Pressing member 28 Hanger

[0059] 31 driving member 32 first connecting member

[0060] 33 second connecting member 34 first fastener

[0061] D1 First horizontal direction D2 Second horizontal direction

[0062] DH vertical direction DETAILED DESCRIPTION

[0063] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with embodiments of the present invention.

[0064] In order to fully understand the embodiments of the present invention, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art.

[0065] The utility model provides an aerial suspension conveyor line.

[0066] See also Figure 1 The overhead suspension conveyor line 1 includes a first rail 11, a transmission assembly 21, and a driving member 31. The first rail 11 is arranged along a first horizontal direction D1 and has a downwardly opening accommodating cavity 11a. The transmission assembly 21 is connected to the first rail 11 and is located in the accommodating cavity 11a. The driving member 31 is detachably connected to the first rail 11 and is transmission-connected to the transmission assembly 21. Figure 2 The overhead conveyor line 1 further includes a first connecting member 32 and a second connecting member 33. The first connecting member 32 is a plate-shaped member connected to the drive member 31. The second connecting member 33 is arranged along a second horizontal direction D2, which is perpendicular to the first horizontal direction D1. The two ends of the second connecting member 33 are respectively connected to the first connecting member 32 and the first rail 11.

[0067] According to the aerial suspension conveyor line 1 of the present invention, the driving component 31 is easy to disassemble and assemble relative to the first track 11, which reduces the difficulty of maintaining the first track 11 and the driving component 31 and improves the flexibility of using the aerial suspension conveyor line 1.

[0068] It should be noted that the driving member 31 is preferably configured as a motor, which can be understood to have an output shaft. The first connecting member 32 is detachably connected to the driving member 31 , for example, the first connecting member 32 is connected to the driving member 31 via a plurality of bolts. Figure 2 In the embodiment, the output shaft is arranged along the second horizontal direction D2 and extends outward relative to the first connecting member 32 to connect to the transmission assembly 21 located within the first track 11. A snap-fit ​​structure may be provided between the second connecting member 33, the first connecting member 32, and the first track 11. The second connecting member 33 is first snap-fitted to the first track 11. The drive member 31, which is connected to the first connecting member 32, is then aligned with the first track 11. The first connecting member 32 is then snap-fitted to the second connecting member 33 to complete the installation connection between the drive member 31 and the first track 11.

[0069] Alternatively, please continue to see Figure 2, the first connecting member 32, the second connecting member 33 and the first rail 11 have a hole structure with corresponding positions. Those skilled in the art know that the first rail 11 is usually constructed as an integrally formed aluminum profile, and the aluminum profile can be equipped with corresponding spring nuts. The aerial suspension conveyor line 1 also includes a first fastener 34, which is connected to the hole structure. It can be understood that the holes of the first connecting member 32 and the second connecting member 33 correspond to the holes of the spring nut, and the first fastener 34 can be constructed as a bolt. The first fastener 34 is passed through the holes of the first connecting member 32 and the second connecting member 33 and is connected to the spring nut located in the aluminum profile, so that the first connecting member 32 and the second connecting member 33 are fixed to the first rail 11.

[0070] See also Figure 1 and Figure 3 , the transmission assembly 21 includes a transmission member 22 and a transmission belt 23. The transmission member 22 is pivotally connected to the first rail 11 about the second horizontal direction D2. Those skilled in the art know that the belt-type aerial suspension conveyor line is a type of aerial suspension conveyor line, and the transmission belt 23 is generally a belt made of special materials, which has good flexibility, wear resistance and sealing performance, and is usually in a closed loop. The transmission members 22 are arranged in pairs, and adjacent transmission members 22 are spaced along the first horizontal direction D1. One end of at least one transmission member 22 is connected to the drive member 31. The transmission belt 23 is constructed in a closed shape and is wound around the adjacent transmission members 22 along the first horizontal direction D1 to follow the operation of the transmission member 22. It can be understood that the transmission member 22 can be constructed as a pivot shaft connected to a pulley suitable for the transmission belt 23, and the drive member 31 can be connected to the transmission member 22 via a coupling. Please refer to Figure 4 A bearing 24 suitable for the pivot shaft is also installed in the first track 11. It should be noted that in order to improve the fit with the transmission belt 23, the aforementioned pulley is usually selected from drum wheels.

[0071] See also Figures 2 to 4 To facilitate adjustment of the tension of the transmission belt 23, at least one transmission member 22 is configured to be movable and adjustable relative to the first track 11 along the first horizontal direction D1 to adjust the tension of the transmission belt 23. Furthermore, the first track 11 defines a slide groove 11d that extends through the first track 11 along the second horizontal direction D2. The at least one transmission member 22 is configured to be slidably connected to the slide groove 11d along the first horizontal direction D1. Figure 1, the aerial suspension conveyor line 1 also includes a first fixing member 12 and a second fixing member 13. Specifically, the first fixing member 12 is detachably connected to the top surface of the first rail 11. The second fixing members 13 are arranged in pairs, and adjacent second fixing members 13 are spaced apart along the second horizontal direction D2. The second fixing member 13 is vertically connected to the bottom surface of the first fixing member 12, and the second fixing member 13 is adjustable relative to the first fixing member 12 along the first horizontal direction D1. The transmission member 22 protrudes outward from the slide groove 11d along the second horizontal direction D2, and is pivotally connected to the second fixing member 13 adjacent along the second horizontal direction D2 around the second horizontal direction D2.

[0072] See also Figure 1 、 Figure 2 and Figure 4 As can be seen from the above, the first rail 11 can be constructed as an aluminum profile and equipped with corresponding spring nuts. Figure 2 In the embodiment, the first rail 11 is provided with a mounting groove 11b, and the spring nut can be assembled into the mounting groove 11b. The first fixed member 12 can be connected to the first rail 11 by means of fasteners. The second fixed member 13 can also be connected to the first fixed member 12 by means of fasteners. When adjusting the tension of the transmission belt 23, the position of the first fixed member 12 relative to the first rail 11 can be adjusted along the first horizontal direction D1, and the position of the second fixed member 13 relative to the first fixed member 12 can also be adjusted along the first horizontal direction D1. In this solution, the second connecting member 33 is connected to the second fixed member 13, and the aforementioned bearing 24 is connected to the second fixed member 13. It is easy to imagine that after adjusting the position of the first fixed member 12 and / or the second fixed member 13, the first fixed member 12 and / or the second fixed member 13 need to be positioned as necessary. Therefore, the overhead suspended conveyor line 1 also includes a positioning assembly 18, and the positioning assembly 18 includes a first positioning member 15 and a second positioning member 16. The first positioning member 15 is disposed along the second horizontal direction D2 and connected to the first rail 11. Both ends of the first positioning member 15 protrude outward from the first rail 11 along the second horizontal direction D2. The second positioning member 16 is disposed along the first horizontal direction D1 and is adjustably connected to the first positioning member 15 along the first horizontal direction D1. One end of the second positioning member 16 abuts against the second fixing member 13. It will be understood that the second positioning member 16 is used to prevent the second fixing member 13 from moving toward the center of the first rail 11, thereby preventing the transmission belt 23 from loosening.

[0073] See also Figure 4 and Figure 5Specifically, the first rail 11 has a first mounting hole extending through it along the second horizontal direction D2. The first positioning member 15 is configured as a rod-shaped member and is inserted into the first mounting hole. The first positioning member 15 has a second mounting hole extending through it along the first horizontal direction D1. It is understood that the second mounting hole is located in the portion of the first positioning member 15 that extends outside the first rail 11 along the second horizontal direction D2. The second positioning member 16 is inserted into the second mounting hole, with both ends of the second positioning member 16 protruding outward from the second mounting hole. It should be noted that the second mounting hole can be configured as a threaded hole, with the second positioning member 16 having external threads adapted for the second mounting hole. Alternatively, the positioning assembly 18 further includes at least one second fastener 17, which is connected to the second positioning member 16 and abuts against the first positioning member 15. The second positioning member 16 can be configured as a bolt, and the second fastener 17 can be configured as a nut. The second fastener 17 is located on the side of the first positioning member 15 that is closer to the second fixing member 13 along the first horizontal direction to prevent the second positioning member 16 from moving away from the second fixing member 13. When the number of the second fastening members 17 is two or more, the second fastening members 17 may be located on both sides of the first positioning member 15 along the first horizontal direction D1 .

[0074] See also Figure 6 After the driving member 31 is started, the driving member 31 drives the transmission member 22 to operate, thereby causing the transmission belt 23 to operate. As can be seen from the above, the transmission belt 23 is constructed in a closed shape and has a certain degree of flexibility. If the transmission belt 23 is large in the first horizontal direction D1, the transmission belt 23 will collapse downward in the vertical direction DH under the action of its own weight, thereby affecting the normal operation of the transmission belt 23. Return to reference Figure 4 and Figure 5 The first positioning member 15 is partially located in the inner area of ​​the transmission belt 23. Furthermore, the second fixing member 13 has a positioning groove 13a extending through the second fixing member 13 along the second horizontal direction D2. The overhead conveyor line 1 also includes a guide member 14 connected to the positioning groove 13a of the adjacent second fixing member 13 along the second horizontal direction D2. The guide member 14 is partially located in the inner area of ​​the transmission belt 23.

[0075] The following is a necessary explanation of the "inner area":

[0076] Because the transmission belt 23 is constructed in a closed shape, it has two belts along the vertical direction DH. The upper belt may collapse downward. The so-called "inner area" is the area between the two adjacent belts. In other words, the guide member 14 and the first positioning member 15 can provide a certain support effect on the upper belt, thereby preventing the belt from collapsing and ensuring the effective operation of the transmission belt 23.

[0077] Return to Reference Figure 2 The first track 11 further has a positioning groove 11c inside, and a transmission belt located below is mounted in the positioning groove 11c, thereby ensuring that the running position of the transmission belt 23 is determined to avoid deviation.

[0078] See also Figure 7 and Figure 8 The overhead suspended conveyor line 1 also includes a walking trolley 25, which is movably connected to the first rail 11 along the first horizontal direction D1 and protrudes downward from the first rail 11. It should be noted that the walking trolley 25 may include a frame 26 and a clamping member 27. The frame 26 is located in the accommodating cavity 11a. The clamping member 27 is movably connected to the frame 26 along the vertical direction DH between a first position and a second position. The clamping member 27 at the first position abuts against the transmission belt 23 so that the walking trolley 25 can move with the transmission belt 23; the clamping member 27 at the second position disengages from the transmission belt 23 so that the transmission belt 23 idles. A hanger 28 is also connected to the bottom of the walking trolley 25, and the hanger 28 is used to carry goods.

[0079] According to the aerial suspended conveyor line of the present invention, the drive component and the first track are easily disassembled and assembled, facilitating maintenance. Furthermore, the use of a transmission belt offers a relatively simple structure and enables continuous, high-speed material transport, improving production efficiency. Aerial material transport eliminates floor space, facilitating space optimization in the production workshop. The transmission belt tension can be easily adjusted, and corresponding support measures are provided to ensure continuous and orderly operation of the line.

[0080] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate component. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise stated.

[0081] The present invention has been described through the above embodiments, but it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Those skilled in the art will appreciate that many more variations and modifications may be made based on the teachings of the present invention, and all of these variations and modifications fall within the scope of protection claimed by the present invention.

Claims

1. An aerial suspension conveyor line, characterized in that: The aerial suspension conveyor line comprises: a first track, the first track being arranged along a first horizontal direction, and the first track having a receiving cavity opening downward; a transmission assembly connected to the first track and located in the accommodating cavity; a driving member, the driving member being detachably connected to the first rail and being transmission-connected to the transmission assembly; a first connecting member configured as a plate-shaped member and connected to the driving member; The second connecting member is arranged along a second horizontal direction, the second horizontal direction is perpendicular to the first horizontal direction, and two ends of the second connecting member are respectively connected to the first connecting member and the first track.

2. The overhead suspension conveyor line according to claim 1, characterized in that: The first connecting member, the second connecting member and the first track have hole structures with corresponding positions. The aerial suspension conveyor line also includes a first fastener, which is connected to the hole structure so that the first connecting member and the second connecting member are fixed to the first track.

3. The overhead suspension conveyor line according to claim 1, characterized in that: The transmission assembly comprises: a transmission member, the transmission member being pivotally connected to the first rail about the second horizontal direction, the transmission members being arranged in pairs, adjacent transmission members being spaced apart along the first horizontal direction, and one end of at least one transmission member being transmission-connected to the driving member; a transmission belt configured in a closed shape and wound around the transmission members adjacent to each other in the first horizontal direction so as to follow the transmission members; At least one of the transmission components is configured to be movable and adjustable relative to the first track along the first horizontal direction so as to adjust the tension of the transmission belt.

4. The overhead suspension conveyor line according to claim 3, characterized in that: The first track is provided with a slide groove, the slide groove passes through the first track along the second horizontal direction, and at least one of the transmission members is configured to be slidably connected to the slide groove along the first horizontal direction; The aerial suspension conveyor line also includes: a first securing member detachably connected to a top surface of the first rail; second fixing members, the second fixing members being provided in pairs, adjacent second fixing members being spaced apart along the second horizontal direction, the second fixing members being vertically connected to the bottom surface of the first fixing member, and the second fixing members being adjustable relative to the first fixing member along the first horizontal direction; The transmission member protrudes outward from the sliding groove along the second horizontal direction and is pivotally connected to the second fixing member adjacent to the second horizontal direction about the second horizontal direction.

5. The overhead suspension conveyor line according to claim 4, characterized in that: The second fixing member has a positioning groove running through the second horizontal direction. The aerial suspension conveyor line further includes a guide member connected to the positioning groove at the second fixing member adjacent to each other along the second horizontal direction, and a portion of the guide member is located in an inner area of ​​the transmission belt.

6. The overhead suspension conveyor line according to claim 4, characterized in that: The aerial suspension conveyor line further includes a positioning assembly, which includes: a first positioning member, the first positioning member being arranged along the second horizontal direction and connected to the first rail, with both ends of the first positioning member protruding outward from the first rail along the second horizontal direction; A second positioning member is provided along the first horizontal direction, the second positioning member is configured to be adjustably connected to the first positioning member along the first horizontal direction, and one end of the second positioning member abuts against the second fixing member.

7. The overhead suspension conveyor line according to claim 6, characterized in that: The first rail has a first mounting hole penetrating the first rail along the second horizontal direction, and the first positioning member is configured as a rod-shaped member and is inserted into the first mounting hole. The first positioning member has a second mounting hole penetrating the first horizontal direction, the second positioning member is passed through the second mounting hole, and both ends of the second positioning member protrude outward from the second mounting hole.

8. The overhead suspension conveyor line according to claim 7, characterized in that: The second mounting hole is configured as a threaded hole, and the second positioning member has an external thread suitable for the second mounting hole; or The positioning assembly also includes at least one second fastener, which is connected to the second positioning member and abuts against the first positioning member. The second fastener is located on a side of the first positioning member close to the second fixing member along the first horizontal direction to prevent the second positioning member from moving in a direction away from the second fixing member.

9. The overhead suspension conveyor line according to claim 7, characterized in that: The first positioning member portion is located in an inner area of ​​the transmission belt.

10. The overhead suspension conveyor line according to claim 3, characterized in that: The aerial suspension conveyor line further includes a trolley, which is movably connected to the first track along the first horizontal direction and protrudes downward from the first track, and the trolley includes: a vehicle frame, the vehicle frame being located in the accommodating cavity; a pressing member movably connected to the frame in a vertical direction between a first position and a second position; The pressing member located at the first position abuts against the transmission belt so that the traveling carriage can move along with the transmission belt, and the pressing member located at the second position is disengaged from the transmission belt so that the transmission belt idles.

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