Towel folding machine

Abstract

The invention discloses a towel folding machine, which relates to the technical field of cloth processing. A loading conveyor, a detection platform, an upper conveying mechanism and a lower conveying mechanism are sequentially arranged on a frame along a material conveying direction. A transfer mechanism is arranged on the frame at a position corresponding to the loading conveyor and the detection platform. A material drop opening is provided on the upper conveying mechanism. A first-level folding mechanism is arranged at a position corresponding to the material drop opening on the frame. The first-level folding mechanism comprises a first folding plug plate movably arranged downward on the frame. A second-level folding mechanism is also arranged at a position corresponding to a feeding end of the lower conveying mechanism on the frame. The second-level folding mechanism comprises a second folding plug plate movably arranged on the frame along a horizontal direction. A third-level folding mechanism is arranged at a position corresponding to a discharging end of the lower conveying mechanism on the frame. The discharging end of the lower conveying mechanism is connected to a roller-type discharging conveyor. This scheme utilizes multiple devices to cooperate with each other, so as to realize automatic loading and folding of towels, thereby improving subsequent packaging efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of towel production, in particular to a towel folding machine. Background Art

[0002] With the development of social economy and the improvement of people's living standards, the demand for catering, accommodation and other service industries has also increased simultaneously. Among them, disposable towels are mainly used in high-end hotel restaurants. Therefore, while enjoying comfortable and clean services, the consumption of disposable wet towels or convenient dry towels has also increased significantly. In order to facilitate the packaging, transportation and cleanliness of towels, towels need to be folded. In order to improve the efficiency of towel folding and reduce the labor intensity of staff, towel folding machines are often used to complete the towel folding work. The towel folding machine adopts a mechanical principle combining electricity and gas to fold towels of various specifications into a rectangular flat shape. It is mainly used for the operation of hotel wool bath towels and wet towels, saving time and labor. As the core working component of the towel folding machine, the design of the folding mechanism is of great importance. However, the existing towel folding machines often use sliding rods to fold the edges of towels or use air blowing to fold them, which is prone to wrinkles and incomplete folding. At the same time, the existing towel folding machines generally cannot realize automatic feeding, conveying and folding full-process production. Summary of the invention

[0003] The purpose of the present invention is to overcome the problems existing in the prior art and to provide a towel folding machine. This scheme utilizes multiple devices to cooperate with each other to realize automatic loading and folding of towels, thereby improving the subsequent packaging efficiency.

[0004] The present invention is realized through the following technical scheme: a towel folding machine comprises a frame, on which a feeding conveyor, a detection platform, an upper conveying mechanism and a lower conveying mechanism are sequentially arranged along the material conveying direction, a transfer mechanism for transfer is arranged on the frame at a position corresponding to the feeding conveyor and the detection platform, a material drop opening is provided on the upper conveying mechanism, a primary folding mechanism for initially folding cloth articles is arranged at a position corresponding to the material drop opening on the frame, the primary folding mechanism comprises a first folding plug plate movably arranged downward on the frame, and a material drop opening is also arranged on the frame at a position corresponding to the feeding end of the lower conveying mechanism. A secondary folding mechanism for folding cloth items twice, the secondary folding mechanism includes a second folding plug plate movably arranged on a frame in a horizontal direction, a third-level folding mechanism for folding cloth items three times is arranged at a position on the frame corresponding to the discharge end of the lower conveying mechanism, the third-level folding mechanism includes a third folding plug plate movably arranged on the frame downward, the first folding plug plate and the third folding plug plate are arranged perpendicular to each other, and a roller discharge conveyor is connected to the discharge end of the lower conveying mechanism; and pressing mechanisms for pre-pressing cloth items are symmetrically arranged on the frame at positions on both sides corresponding to the lower side of the second folding plug plate.

[0005] In order to further optimize the present invention, the following technical solutions may be preferably used:

[0006] Preferably, the inspection platform comprises a first conveyor and a second conveyor which are connected and arranged up and down, and a visual inspection instrument for visual inspection is provided on the frame at a position just above the conveying surface of the first conveyor and the second conveyor, and the conveying directions of the first conveyor and the second conveyor are opposite, and the frame is also provided with a turning mechanism for turning over the conveyed articles on the first conveyor;

[0007] Preferably, a fill light module is arranged on the rack at positions corresponding to both sides of the visual detector, and the fill light module includes a fixing frame arranged on the rack, a fill light plate is obliquely arranged on the fixing frame, and a fill light is arranged on the fill light plate.

[0008] Preferably, the transfer mechanism includes a transfer frame movably arranged on the frame, a plurality of suction cups for adsorbing materials are arranged at the bottom of the transfer frame, the suction cups are connected to an air pump, the frame is provided with a lateral movement mechanism for driving the transfer frame to move horizontally, and a lifting mechanism for driving the transfer frame to move up and down, the transfer frame is also provided with a liquid adding module for spraying liquid medicine onto the disposable towels, the liquid adding module includes a liquid adding head arranged on the transfer frame, and the liquid adding head is externally connected to a liquid medicine barrel and a power source through a pipeline.

[0009] Preferably, the transverse movement mechanism includes a transverse movement slide rail arranged along the conveying direction of the first conveyor, a transverse movement slider is provided on the electric slide rail, a driving mechanism 1 for driving the transverse movement slider to move linearly along the transverse movement slide rail is provided on the frame, the lifting mechanism includes a lifting seat provided on the slider, a lifting slide rail is provided on the lifting seat in a vertical direction, a lifting slider is provided on the lifting slide rail, the transfer frame is provided on the lifting slider, and a driving mechanism 2 for driving the lifting slider to move linearly along the lifting slide rail is provided on the frame.

[0010] Preferably, the upper conveying mechanism includes a third conveyor connected end to end with the second conveyor, the drop port is arranged on the frame at a connection position corresponding to the second conveyor and the third conveyor, the discharge end of the third conveyor is connected with a collection box for collecting defective products, the second conveyor is a belt conveyor, and the third conveyor is an O-belt conveyor.

[0011] Preferably, the lower conveying mechanism includes a fourth conveyor and a fifth conveyor which are arranged side by side on the frame, a feeding channel is formed between the fourth conveyor and the fifth conveyor, the second folding plug plate is arranged opposite to the feeding channel, the fourth conveyor is a belt conveyor, and the fifth conveyor is an O-belt conveyor.

[0012] Preferably, the clamping mechanism comprises a clamping rod arranged along the moving direction of the second folding plug plate, and the clamping rod is connected to a second driving mechanism for driving the clamping rod to move linearly back and forth.

[0013] Preferably, a discharge port is arranged on the frame at a position corresponding to directly below the third folding plug plate, a discharge baffle is symmetrically arranged on the frame at a position corresponding to the discharge port, and a pressure roller is symmetrically rotatably arranged on the frame at a position corresponding to directly below the discharge baffle, the two pressure rollers rotate synchronously through gears, and the pressure rollers are connected to a driving motor.

[0014] Preferably, a supporting top plate is further provided on the frame at the position corresponding to the third conveyor, a driving mechanism three for driving the supporting top plate to be lifted and lowered is provided at the bottom of the supporting top plate, and an avoidance groove matching the O-belt conveyor is provided on the supporting top plate.

[0015] The present invention has the following effects:

[0016] 1. This solution uses a folding plate in conjunction with a conveying mechanism to automatically fold the towel multiple times. Specifically, the first folding plug plate and the second folding plug plate are used in conjunction with the upper conveying mechanism and the lower conveying mechanism to fold the towel twice in the length direction, and the third folding plug plate is used in conjunction with the lower conveying mechanism to fold the towel for the third time in the width direction, thereby reducing wrinkles and inadequate folding of edges during the folding process and improving the folding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the towel folding machine;

[0018] Figure 2 It is a schematic diagram of the overall structure of the conveying device in the towel folding machine;

[0019] Figure 3 A top view of a conveying device in a towel folding machine;

[0020] Figure 4 It is a structural schematic diagram of the transfer mechanism in the towel folding machine;

[0021] Figure 5 It is a schematic diagram of the internal structure of the detection platform in the towel folding machine;

[0022] Figure 6 It is a schematic diagram of the overall structure of the folding mechanism in the towel folding machine;

[0023] Figure 7 It is a front view of the folding mechanism in the towel folder;

[0024] Figure 8 It is a schematic diagram of the structure of the pressing roller in the towel folding machine;

[0025] Fig. 9 It is a schematic diagram of the structure of the three-stage folding mechanism in the towel folder.

[0026] in:

[0027] 1-frame; 2-towel, 3-roller discharge conveyor;

[0028] 101-feeding conveyor; 102-detection platform, 103-first conveyor, 104-second conveyor, 105-transfer mechanism, 106-visual detector, 107-fill light module, 108-fixed frame, 109-fill light board, 110-waist-shaped mounting hole, 111-arc-shaped turning guide plate, 112-transfer frame, 113-suction cup, 114-transverse slide rail, 115-transverse slider, 116-driving mechanism 1, 117-lifting seat, 118-lifting slide rail, 119-lifting slider, 120-driving mechanism 2;

[0029] 201-upper conveying mechanism; 202-lower conveying mechanism; 203-first-level folding mechanism; 204-second-level folding mechanism; 205-third-level folding mechanism; 206-feeding channel; 207-third conveyor; 208-collecting box; 209-supporting top plate; 210-avoidance groove; 211-driving mechanism three; 212-first folding plug plate; 213-second folding plug plate; 214-third folding plug plate; 215-pressing roller; 216-discharging baffle plate; 217-pressing mechanism; 218-pressing rod; 219-driving mechanism two; 220-guiding mechanism; 221-linear guide rail; 222-guide slider; 223-dropping baffle plate; 224-arc bending portion; 225-tooth structure; 226-fourth conveyor; 227-fifth conveyor. DETAILED DESCRIPTION

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0032] Example 1

[0033] like Figure 1-9 As shown: a towel folding machine, including a frame 1, on which a feeding conveyor 101, a detection platform 102, an upper conveying mechanism 201, and a lower conveying mechanism 202 are sequentially installed along the material conveying direction, and a transfer mechanism 105 for transferring towels 2 is installed at a position corresponding to the feeding conveyor and the detection platform on the frame, wherein the transfer mechanism 105 includes a transfer frame movably installed on the frame, and a plurality of suction cups 113 for adsorbing materials are installed at the bottom of the transfer frame, and the suction cups are connected to an air pump, and a transverse movement mechanism for driving the transfer frame to move horizontally and a lifting mechanism for driving the transfer frame to move up and down are installed on the frame; wherein the transverse movement mechanism includes a transverse movement slide rail 114 arranged along the conveying direction of the first conveyor, and a transverse movement slider 115 is installed on the electric slide rail, and a transverse movement slider 115 is installed on the frame. A driving mechanism 116 is provided for driving the transverse sliding block to move linearly along the transverse sliding rail, wherein a liquid adding module for spraying liquid medicine onto the disposable towels is also installed on the transfer frame, the liquid adding module comprises a liquid adding head installed on the transfer frame, the liquid adding head is externally connected to a liquid adding pump and a liquid medicine barrel through a pipeline, and the liquid medicine is sprayed onto the towels by the liquid adding head, the lifting mechanism comprises a lifting seat 117 installed on the slider, a lifting rail 118 is installed on the lifting seat in the vertical direction, a lifting slider 119 is installed on the lifting rail, the transfer frame 112 is installed on the lifting slider, and a driving mechanism 2 120 for driving the lifting slider to move linearly along the lifting rail is installed on the frame, wherein the driving mechanism 1 and the driving mechanism 2 can be electric or pneumatic, for example, an electric push rod, an electric slide rail, a cylinder, etc. The detection platform includes a first conveyor 103 and a second conveyor 104 that are connected and arranged up and down. A visual inspection instrument 106 for visual inspection is installed on the frame at the position directly above the conveying surface of the first conveyor and the second conveyor. The visual inspection instrument 106 adopts mature technology in the prior art, wherein fill light modules are installed on the frame at the positions on both sides of the visual inspection instrument, and the fill light module 107 includes a fixed frame 108 installed on the frame, and a fill light board 109 is installed obliquely on the fixed frame, and a fill light is installed on the fill light board, and the fill light board is used to improve the detection effect of the visual inspection instrument 106; a waist-shaped mounting hole 110 is opened on the back of the fixed frame, and the fixed frame is installed on the frame by bolts installed on the waist-shaped mounting hole, so as to facilitate the adjustment of its installation tilt angle according to the use requirements. In this embodiment, the conveying directions of the first conveyor and the second conveyor are opposite; wherein the feeding conveyor, the first conveyor, and the second conveyor are all belt conveyors, and the conveying direction of the feeding conveyor is perpendicular to the first conveyor and the second conveyor, so as to facilitate the compact layout of the overall equipment.

[0034] The upper conveying mechanism is provided with a material drop opening, and a primary folding mechanism 203 for initially folding the cloth items is installed at a position corresponding to the material drop opening on the frame, the primary folding mechanism includes a first folding plug plate movably installed downward on the frame, and a secondary folding mechanism 204 for secondary folding the cloth items is also installed at a position corresponding to the feeding end of the lower conveying mechanism on the frame, the secondary folding mechanism includes a second folding plug plate movably installed on the frame along a horizontal direction, and a third folding mechanism 205 for tertiary folding the cloth items is installed at a position corresponding to the discharging end of the lower conveying mechanism on the frame, the third folding mechanism includes a third folding plug plate movably installed downward on the frame, the first folding plug plate and the third folding plug plate are installed vertically to each other, and the discharging end of the lower conveying mechanism is connected to a roller discharging conveyor 3.

[0035] The upper conveying mechanism includes a second conveyor and a third conveyor 207 connected end to end, the drop port is installed on the frame at the connection position corresponding to the second conveyor and the third conveyor, the discharge end of the third conveyor is connected to a collection box 208 for collecting defective products, the second conveyor is a belt conveyor, and the third conveyor is an O-belt conveyor; the lower conveying mechanism includes a fourth conveyor 226 and a fifth conveyor 227 installed side by side on the frame, a feeding channel 206 is formed between the fourth conveyor and the fifth conveyor, the second folding plug is installed opposite to the feeding channel, the fourth conveyor is a belt conveyor, and the fifth conveyor is an O-belt conveyor. This scheme uses folding plates to cooperate with the conveying mechanism to automatically fold the towel multiple times, specifically using the first folding plug and the second folding plug to cooperate with the upper conveying mechanism and the lower conveying mechanism to fold the towel twice in the length direction, and using the third folding plug to cooperate with the lower conveying mechanism to fold the towel for the third time in the width direction, which reduces wrinkles and incomplete edge folding during the folding process and improves the folding quality. The working ends of the first folding plug plate 212, the second folding plug plate 213 and the third folding plug plate 214 are all installed with a tooth structure 225, and a driving mechanism 1 for driving the first folding plug plate, the second folding plug plate and the third folding plug plate to reciprocate linear motion is installed on the frame. The driving mechanism 1 can adopt one of a cylinder, an oil cylinder and an electric push rod.

[0036] A blanking baffle 223 is symmetrically installed between the upper conveying mechanism and the lower conveying mechanism at the corresponding blanking port position, and an outward arc-shaped bending portion 224 is installed on the blanking baffle at the corresponding inlet position to facilitate accurate material drop-in. A clamping mechanism 217 for pre-pressing fabric items is symmetrically installed on the frame at the two sides corresponding to the lower side of the second folding plug plate, and the clamping mechanism includes a clamping rod 218 installed along the moving direction of the second folding plug plate, and the clamping rod is connected to a driving mechanism 219 for driving the clamping rod to reciprocate linearly; a guide mechanism 220 is installed on the frame at the corresponding positions of the first folding plug plate, the second folding plug plate, and the third folding plug plate, and the guide mechanism includes a linear guide rail 221 arranged along the moving direction of the first folding plug plate, the second folding plug plate, and the third folding plug plate, respectively, and a guide slider 222 cooperating with the linear guide rail is installed on the first folding plug plate, the second folding plug plate, and the third folding plug plate, respectively, and the stability of the folding process can be improved by using the configured guide mechanism.

[0037] A discharge port is installed on the frame at a position corresponding to the position directly below the third folding plug plate, a discharge baffle 216 is symmetrically installed on the frame at a position corresponding to the discharge port, and a clamping roller 215 is symmetrically rotatably installed on the frame at a position corresponding to the position directly below the discharge baffle. The two clamping rollers rotate synchronously through gears, and the clamping rollers are connected to a driving motor. A supporting top plate 209 is also provided on the frame at a position corresponding to the third conveyor, and a driving mechanism 211 for driving the supporting top plate to rise and fall is installed at the bottom of the supporting top plate. An avoidance groove 210 matching the O-belt conveyor is provided on the supporting top plate, and the supporting top plate is used to provide auxiliary support for the towels on the conveying surface during the operation of the first folding plug plate.

[0038] As a preferred embodiment, in this embodiment, the discharge end of the first conveyor corresponds to the feed end of the second conveyor, and the turning mechanism includes an arc-shaped turning guide plate 111 installed at the discharge end of the first conveyor. The arc-shaped turning guide plate 111 is used to turn over the conveyed items on the first conveyor to facilitate subsequent surface defect detection on the other side.

[0039] The working process of this equipment is as follows: first, the towels are placed in stacks on the feeding conveyor, and the manipulator in the transfer mechanism is used to transfer the towels to the inspection platform for subsequent transportation. At the same time, the surface of the towels is inspected for defects, and the first and second conveyors in the inspection platform are used to automatically turn the towels over. The inspected towels are conveyed forward by the second conveyor in the upper conveying mechanism. When the towel product has defects, the towel product continues to be conveyed forward along the third conveyor until it is conveyed to the collection box. During this process, the first folding mechanism does not work. When the towel product is qualified, that is, when the towel moves to the position between the second and third conveyors, the first folding plate of the first folding mechanism punches down to fold the towel for the first time along the length direction, and then the folded towel slides along the blanking plate to the lower conveyor At the feeding port of the feeding mechanism, the pressing rods in the pressing mechanisms on both sides of the second folding mechanism extend out, and then the pressing rods press the towel, and then the first folding plug in the first folding mechanism is reset and retracted, and the pressing rod is used to prevent the first folding plug from taking the towel away when it is reset, and then the second folding plug of the second folding mechanism rushes sideways in the conveying direction to realize the second folding of the towel along the length direction, and then the towel folded twice is conveyed forward through the fifth conveyor, and when the towel is conveyed to the end, the third folding plug in the third folding mechanism passes through the conveyor belt gap of the fifth conveyor and punches down to realize the folding of the towel along the width direction, thereby completing the three folding actions of the towel, and finally the towel is pre-shaped under the action of the pressing roller, which is convenient for subsequent conveying and packaging, and enters the roller discharge conveyor and subsequent packaging process for packaging.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A towel folding machine, comprising a frame, characterized in that: The frame is provided with a feeding conveyor, a detection platform, an upper conveying mechanism, and a lower conveying mechanism in sequence along the material conveying direction; a transfer mechanism for transfer is provided on the frame at a position corresponding to the feeding conveyor and the detection platform; a material drop opening is provided on the upper conveying mechanism; a primary folding mechanism for initially folding the cloth articles is provided at a position corresponding to the material drop opening on the frame; the primary folding mechanism includes a first folding plug plate movably provided downward on the frame; a second folding mechanism for secondary folding the cloth articles is also provided at a position corresponding to the feeding end of the lower conveying mechanism on the frame The second-level folding mechanism comprises a second folding plug plate movably arranged on the frame in the horizontal direction, a third-level folding mechanism for folding the cloth article three times is arranged at the position of the discharge end of the lower conveying mechanism on the frame, the third-level folding mechanism comprises a third folding plug plate movably arranged downward on the frame, the first folding plug plate and the third folding plug plate are arranged perpendicular to each other, the discharge end of the lower conveying mechanism is connected to a roller discharge conveyor, and a pressing mechanism for pre-pressing the cloth article is symmetrically arranged on both sides of the frame corresponding to the lower side of the second folding plug plate; The detection platform includes a first conveyor and a second conveyor that are connected and arranged up and down. A visual inspection instrument for visual inspection is provided on the frame just above the conveying surfaces of the first conveyor and the second conveyor. The conveying directions of the first conveyor and the second conveyor are opposite. The frame is also provided with a turning mechanism for turning over the conveyed items on the first conveyor.

2. A towel folding machine according to claim 1, characterized in that: A fill light module is arranged on the frame at positions on both sides corresponding to the visual detector, and the fill light module includes a fixing frame arranged on the frame, a fill light plate is arranged obliquely on the fixing frame, and a fill light is arranged on the fill light plate.

3. A towel folding machine according to claim 1, characterized in that: The transfer mechanism includes a transfer frame movably arranged on a frame, a plurality of suction cups for adsorbing materials are arranged at the bottom of the transfer frame, the suction cups are connected to an air pump, the frame is provided with a lateral movement mechanism for driving the transfer frame to move horizontally, and a lifting mechanism for driving the transfer frame to move up and down, the transfer frame is also provided with a liquid adding module for spraying liquid medicine onto the disposable towels, the liquid adding module includes a liquid adding head arranged on the transfer frame, and the liquid adding head is externally connected to a liquid medicine barrel and a power source through a pipeline.

4. A towel folding machine according to claim 3, characterized in that: The transverse movement mechanism includes a transverse movement rail arranged along the conveying direction of the first conveyor, a transverse movement slider is provided on the transverse movement rail, and a driving mechanism 1 for driving the transverse movement slider to move linearly along the transverse movement rail is provided on the frame. The lifting mechanism includes a lifting seat provided on the slider, a lifting rail is provided on the lifting seat in the vertical direction, a lifting slider is provided on the lifting rail, the transfer frame is provided on the lifting slider, and a driving mechanism 2 for driving the lifting slider to move linearly along the lifting rail is provided on the frame.

5. The towel folding machine according to claim 1, characterized in that: The upper conveying mechanism includes a third conveyor connected end to end with the second conveyor, the drop port is arranged on the frame at a connection position corresponding to the second conveyor and the third conveyor, the discharge end of the third conveyor is connected with a collection box for collecting defective products, the second conveyor is a belt conveyor, and the third conveyor is an O-belt conveyor.

6. A towel folding machine according to claim 1, characterized in that: The lower conveying mechanism includes a fourth conveyor and a fifth conveyor which are arranged side by side on the frame, a feeding channel is formed between the fourth conveyor and the fifth conveyor, the second folding plug plate is arranged opposite to the feeding channel, the fourth conveyor is a belt conveyor, and the fifth conveyor is an O-belt conveyor.

7. The towel folding machine according to claim 1, characterized in that: The clamping mechanism includes a clamping rod arranged along the moving direction of the second folding plug plate, and the clamping rod is connected to a second driving mechanism for driving the clamping rod to reciprocate linearly. When the clamping rod works, the first folding plug plate is reset to prevent the towel from being taken away by the first folding plug plate.

8. The towel folding machine according to claim 1, characterized in that: A discharge port is arranged on the frame at a position corresponding to directly below the third folding plug plate, a discharge baffle is symmetrically arranged on the frame at a position corresponding to the discharge port, and a clamping roller is symmetrically rotatably arranged on the frame at a position corresponding to directly below the discharge baffle, the two clamping rollers rotate synchronously through gears, and the clamping rollers are connected to a driving motor.

9. The towel folding machine according to claim 1, characterized in that: A supporting top plate is also provided on the frame at the position corresponding to the third conveyor, a driving mechanism three for driving the supporting top plate to rise and fall is provided at the bottom of the supporting top plate, and an avoidance groove matching the O-belt conveyor is opened on the supporting top plate.

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