Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and the like are used herein for illustrative purposes only and do not represent the only embodiment.
Referring to fig. 1 and 2, a medium handler according to an embodiment is a storage device for storing paper money, such as an integrated deposit and withdrawal machine, and the medium is paper money. The media processing machine may comprise a frame 1, an identification device 2, a temporary storage device 3, a transmission device 4, a reversing device 5, a storage box 6, a controller 7 and a banknote accessing part (comprising a banknote depositing port 13 and a banknote taking port 14 shown in fig. 1), wherein the controller 7 is connected with and controls the banknote accessing part, the identification device 2, the temporary storage device 3, the transmission device 4, the reversing device 5 and the storage box 6. The banknote storing and taking part is used for interacting with a user and has a storage space for storing banknotes input by the user and banknotes required to be output to the user; the recognition device 2 is used for confirming whether the paper currency meets the circulation requirement; the temporary storage device 3 is used for temporarily storing paper money; the transmission device 4 is used for transmitting paper money and comprises a transmission channel and a corresponding transmission driving mechanism, wherein the transmission channel is positioned among the paper money storing and taking part, the identification device 2, the temporary storage device 3 and the storage box 6; the reversing device 5 is used for switching the transport path of the paper money during the transport of the paper money, and the storage box 6 is used for storing the paper money. Specifically, the rack 1 includes a first core 11 and a second core 12 that are mutually communicated, the banknote storing and taking part, the identification device 2 and the temporary storage device 3 are all located in the first core 11, and the storage box 6 is located in the second core 12. In this embodiment, a plurality of reversing devices 5 are arranged on the conveying device 4 at intervals, and each reversing device 5 selectively reverses the paper money according to the instruction of the controller 7.
The storage box 6 includes a circulation storage box 61 and a waste storage box 62, the circulation storage box 61 is used for storing the recognized banknote which can circulate, and the waste storage box 62 is used for storing the recognized banknote which can not circulate. The inlets of the circulation storage box 61 and the waste storage box 62 are respectively provided with a reversing device 5, and the circulation storage box 61 is provided with a plurality of reversing devices 5, and the inlet of each circulation storage box 61 is correspondingly provided with a reversing device 5.
In this embodiment, as shown in fig. 1, the banknote storing and taking portion of the media processor has a banknote storing port 13 and a banknote taking port 14, both the banknote storing port 13 and the banknote taking port 14 are disposed on the first movement 11, and the recognition device 2 is located between the banknote storing port 13 and the temporary storage device 3. The circulation storage boxes 61 are provided with 5, the reversing devices 5 are provided with 9 reversing devices A-I, wherein the reversing device A corresponds to the banknote taking port 14, the reversing device B corresponds to the banknote storing port 13, the reversing device C is positioned between the identification device 2 and the temporary storage device 3, the reversing devices D to H correspond to the 5 circulation storage boxes 61, and the reversing device I corresponds to the waste storage box 62.
When a user stores paper money, the paper money is placed in the paper money storage opening 13, after the paper money is placed in the first machine core 11 of Zhang Jinru, the paper money is switched to the recognition device 2 under the action of the reversing device B, after the recognition, the paper money which can circulate is switched to the temporary storage device 3 through the reversing device C, and the paper money which cannot circulate is returned to the paper money taking opening 14 through the reversing device D, the reversing device E, the reversing device F, the reversing device G, the reversing device H, the reversing device I and the reversing device A in sequence. After the user takes out the unidentifiable banknote and confirms the deposit number, the controller 7 controls the temporary storage device 3 to output the banknote which can be circulated, and the banknote is stored in the circulation storage box 61 selected by the controller 7 by at least one of the reversing device C and the reversing devices D to H.
When a user takes a banknote, the controller 7 controls the banknote to be output by a selected circulation storage box 61, and is transmitted towards the reversing device I under the action of the corresponding reversing device 5, then enters the identifying device 2 through the reversing device A and the reversing device B in sequence, after identification, the circulated banknote is switched to the temporary storage device 3 through the reversing device C, and the non-circulated banknote enters the waste storage box 62 through the reversing device D-I in sequence. When the number of the paper money in the temporary storage device 3 is the same as that of the paper money required by the user, the paper money is output by the temporary storage device 3, and then sequentially passes through the reversing device C, the identification device 2, the reversing device B and the reversing device A, and finally enters the paper money taking port 14.
It will be appreciated that in other embodiments the number of circulation storage tanks 61 may be 1,2,3, 4, 6 or more, and the number of reversing devices 5 may be varied accordingly to form media processors having different storage capacities.
In addition, the medium processor of an embodiment may be cash products such as an automatic deposit machine and an automatic teller machine, and when the medium processor is an automatic deposit machine, the cash deposit port 13 and the cash taking port 14 may be shared, and when the medium processor is an automatic teller machine, the cash deposit port 13 and the cash taking port 14 may be shared. Or the medium processor of an embodiment may be a cashless product, and the acting object may be various notes, bank cards, etc., and the identification apparatus 2 may be omitted. In other embodiments, the medium may also be a lighter and thinner paper-based medium or a plastic-based medium, such as a check, invoice, or other ticket.
Referring to fig. 3 to 5, in an embodiment, the temporary storage device 3 has an inlet 302 for medium, and the temporary storage device 3 further includes a mounting frame 31, a first rotating mechanism 32, a second rotating mechanism 33, a driving mechanism 34, a winding belt 35, a guiding mechanism 36, and a conveying mechanism 37. Wherein, the first rotary mechanism 32, the second rotary mechanism 33 and the driving mechanism 34 are all installed on the installation frame 31 and connected to the controller 7, one end of the winding belt 35 is connected to the first rotary mechanism 32, the other end is connected to the second rotary mechanism 33, the first rotary mechanism 32 is used for winding and unwinding the winding belt 35, and the second rotary mechanism 33 is used for winding and unwinding the winding medium and the winding belt 35. The driving mechanism 34 is connected with the first rotating mechanism 32 and the second rotating mechanism 33 to realize the active rotation of the first rotating mechanism 32 and the second rotating mechanism 33, and the driving mechanism 34 is also connected with the conveying mechanism 37 to supply power to the conveying mechanism 37 to realize the transmission of the medium. The guiding mechanism 36 is arranged on the mounting frame 31, the guiding mechanism 36 is used for compressing the medium wound on the second rotating mechanism and playing a role of shoveling the banknote when the banknote is discharged, the guiding mechanism 36 and the conveying mechanism 37 together form a conveying channel 304 for the medium to pass through, and the conveying channel 304 is communicated with the inlet and outlet 302.
When the banknote is fed, the controller 7 controls the second rotating mechanism 33 to wind the winding tape 35, the first rotating mechanism 32 winds the winding tape 35, the medium enters the temporary storage device 3 from the inlet and outlet 302, the medium moves towards the second rotating mechanism 33 along the conveying channel 304 under the combined action of the conveying mechanism 37 and the guiding mechanism 36, and when the medium moves to the contact point of the winding tape 35 and the second rotating mechanism 33, the winding tape 35 winds the medium on the second rotating mechanism 33 together. During banknote dispensing, the controller 7 controls the first rotating mechanism 32 to wind up the winding tape 35, the second rotating mechanism 33 to unwind the winding tape 35, the winding tape 35 is separated from the medium, the guide mechanism 36 scoops out the medium, and the medium is sent out of the temporary storage device 3 from the inlet and outlet 302 along the conveying channel 304 through the conveying mechanism 37. Regardless of whether the banknote is fed or fed, the guide mechanism 36 is maintained in intimate contact with the tape and media despite variations in thickness of the tape and media wound around the second rotation mechanism 33. In the side sectional view shown in fig. 3, the unreeling direction of the first rotating mechanism 32 and the reeling direction of the second rotating mechanism 33 are counterclockwise, and the reeling direction of the first rotating mechanism 32 and the unreeling direction of the second rotating mechanism 33 are clockwise; it is apparent that the winding and unwinding directions of the first rotating mechanism 32 and the second rotating mechanism 33 are opposite directions as viewed from the other side opposite to fig. 3.
In the present embodiment, the transport path 304 is located above the second rotating mechanism 33, so that the guide mechanism 36 can maintain close contact with the roll tape 35 wound around the second rotating mechanism 33 by its own weight to press the medium against the second rotating mechanism 33, preventing the medium from being jammed due to loosening, tilting, overlapping, or the like of the medium. In addition, when the banknote is discharged, the guide mechanism 36 is in close contact with the winding tape 35 wound on the second rotating mechanism 33, so that the guide mechanism 36 can be ensured to smoothly scoop out the medium, and the probability of banknote clamping is reduced.
Further, the first rotating mechanism 32 is located above the transmission channel 304, that is, the transmission channel 304 is located between the first rotating mechanism 32 and the second rotating mechanism 33, so that the part where the tape 35 is separated from the medium is as close as possible to the part where the guide mechanism 36 is used for paper money, and the success rate of paper money shoveling is improved.
It is understood that in other embodiments, the relative positional relationship among the first rotation mechanism 32, the second rotation mechanism 33 and the transmission channel 304 may be other forms, for example, the first rotation mechanism 32 and the transmission channel 304 are all located below the second rotation mechanism 33.
The temporary storage device 3 further comprises a tensioning mechanism 38 connected with the guiding mechanism 36, and the tensioning mechanism 38 is used for tensioning the coiled tape 35, so that the coiled tape 35 can be always in a tensioning state in the banknote feeding and discharging processes, and the diameters of the coiled tape 35 wound on the first rotating mechanism 32 and the second rotating mechanism 33 can be ensured to be as small as possible, so that the banknote clamping rate is reduced, and the reliability is improved. The temporary storage device 3 further comprises a detecting mechanism 39 connected to the controller 7, wherein the detecting mechanism 39 comprises a first detector 391, a second detector 392 and a third detector 393, wherein the first detector 391 is arranged between the first rotating mechanism 32 and the guiding mechanism 36 and is capable of detecting a status value of the tape 35, which is understood as the moving speed of the tape 35 or the length of the tape 35 passing the first detector 391 per unit time. When the detection result of the first detector 391 fluctuates within the preset range, it indicates that at least one winding tape 35 remains on the first rotation mechanism 32 or the second rotation mechanism 33, and the unwinding or winding can be continued. When the detection result of the first detector 391 exceeds the preset range, it indicates that the tape 35 on the first rotating mechanism 32 or the second rotating mechanism 33 is used up.
Specifically, when the banknote is fed, the tape 35 moves along the direction from the first rotating mechanism 32 to the second rotating mechanism 33, and the first detector 391 can detect the status value of the tape 35, and if the status value is almost unchanged, the temporary storage device 3 can continue to receive the medium. When the tape 35 on the first rotating mechanism 32 runs out, the state value detected by the first detector 391 is reduced to 0, and at this time, the second rotating mechanism 33 stops rotating, preventing the tape 35 from being separated from the second rotating mechanism 33, and further, the medium needs to be prevented from being continuously conveyed to the temporary storage device 30.
The second detector 392 is provided on the guide mechanism 36, and the second detector 392 has a counting function capable of counting the amount of medium entering the escrow device 3 during the banknote deposit process. Meanwhile, it can also be determined whether or not there is a residual medium in the transport path 304 based on the detection result of the second detector 392.
The third detector 393 is provided on the mounting frame 31 and is used to detect whether there is a residual medium on the second rotating mechanism 33. The third detector 393 is mainly used in the banknote dispensing process to determine whether all the medium wound on the second rotating mechanism 33 is output.
In the present embodiment, the first detector 391, the second detector 392 and the third detector 393 are similar in structure and operation principle, and are correlation-type photoelectric sensors.
As shown in FIG. 6, in one embodiment, the first rotation mechanism 32 includes a first shaft 322 and a take-up reel 324. The first rotating shaft 322 is rotatably disposed on the mounting frame 31. The drive mechanism 34 is connected to a first shaft 322. The driving mechanism 34 can drive the first rotating shaft 322 to rotate relative to the mounting frame 31. The winding wheel 324 is sleeved on the first rotating shaft 322 and is connected with one end of the winding belt 35. The reel 324 is used for winding and unwinding the roll tape 35. Further, the second rotating mechanism 33 includes a second rotating shaft 332 and a drum 334. The second rotating shaft 332 is rotatably disposed on the mounting frame 31. The driving mechanism 34 is connected to the second rotating shaft 332, and the driving mechanism 34 can drive the second rotating shaft 332 to rotate relative to the mounting frame 31. The roller 334 is sleeved on the second rotating shaft 332 and is connected with the other end of the tape 35. The roller 334 is used to wind and unwind the medium and the tape 35.
In the present embodiment, the reel 324 and the tape 35 each include two. Two take-up reels 324 are spaced apart on the first shaft 322. One end of the two tapes 35 far away from the roller 334 corresponds to the two tape wheels 324 one by one.
As shown in fig. 6, in one embodiment, the guide mechanism 36 includes a first channel plate 361. The first passage plate 361 is rotatably provided on the mounting frame 31. The first passage plate 361 is for abutting against the tape 35 to press the medium against the second rotation mechanism 33. Further, the guide mechanism 36 also includes a second channel plate 362. The second channel plate 362 is provided on the mounting frame 31. A transport passage 304 for passing a medium is formed between the first passage plate 361 and the second passage plate 362.
As shown in fig. 6 and 7, the guiding mechanism 36 further includes a holding component 363. The holding member 363 is provided protruding from a side of the first passage plate 361 facing the second rotation mechanism 33. The abutment member 363 is for abutting against the tape 35 to press the medium against the second rotation mechanism 33 and to form a space between the first passage plate 361 and the second rotation mechanism 33.
In the temporary storage device 3, along with the change of the thickness of the medium wound on the second rotating mechanism 33, the first channel plate 361 rotates relative to the mounting frame 31, and since the supporting component 363 is relatively closer to the second rotating mechanism 33 relative to other parts of the first channel plate 361, the supporting component 363 can abut against the tape 35 to press the medium on the second rotating mechanism 33 and form a gap between the first channel plate 361 and the second rotating mechanism 33, so that the first channel plate 361 can keep a distance from the medium, so that the medium between the first channel plate 361 and the second rotating mechanism 33 can be well kept away, the problem that the medium impacts the first channel plate 361 to cause a folding angle or tearing due to overlarge tilting amplitude generated in the process of following the tape 35 to be transmitted is avoided, the reliability of medium transmission is improved, and the failure rate is reduced.
As shown in fig. 8 to 10, in one embodiment, the first passage plate 361 is provided with an auxiliary opening 3611 therethrough. The holding member 363 passes through the auxiliary opening 3611 and is exposed to a side of the first passage plate 361 toward the second rotation mechanism 33. Further, the abutment assembly 363 comprises a plurality of. The plurality of holding members 363 are arranged side by side along the extending direction of the auxiliary opening 3611 to enhance the holding stability of the guide mechanism 36 against the tape 35. In particular, in the present embodiment, the holding component 363 includes two sets. The two sets of holding members 363 are arranged side by side along the extending direction of the auxiliary port 3611. It can be appreciated that in other embodiments, the number of the holding components 363 may be one or more than three, and the specific arrangement manner may be reasonably selected according to practical situations.
As shown in fig. 7 and 10, in one embodiment, the abutment assembly 363 includes a support shaft 3631 and a runner 3632. The support shaft 3631 is provided on a side of the first passage plate 361 facing away from the second rotation mechanism 33. The rotating wheel 3632 is adapted to abut against the tape 35. The rotating wheel 3632 is rotatably sleeved on the supporting shaft 3631. The rotating wheel 3632 passes through the auxiliary opening 3611 and is exposed to a side of the first passage plate 361 toward the second rotating mechanism 33. The wheel 3632 can reduce friction with the tape 35 to improve stability of medium conveyance.
In one embodiment, the rotation axis of the rotating wheel 3632 is parallel to the rotation axis of the first channel plate 361, so as to improve the assembly convenience of the temporary storage device 3, and facilitate the winding of the tape 35 between the first rotating mechanism 32 and the second rotating mechanism 33 and the medium transmission. In the present embodiment, one set of the holding members 363 is provided with one rotating wheel 3632, and the other set of holding members 363 is provided with two rotating wheels 3632. In other embodiments, one set of the holding assemblies 363 may have more than two rotating wheels 3632, and the other set of the holding assemblies 363 may have more than one rotating wheel 3632.
As shown in fig. 8 and 10, in one embodiment, two auxiliary plates 364 are disposed at intervals on a side of the first channel plate 361 facing away from the second rotation mechanism 33. Specifically, two auxiliary plates 364 are located on both sides of the auxiliary port 3611. Each auxiliary plate 364 is provided with a fixing hole 3642. Both ends of the supporting shaft 3631 extend into the corresponding fixing holes 3642 of each auxiliary plate 364. In this embodiment, two fixing holes 3642 are disposed on each auxiliary plate 364 at intervals. Both ends of the supporting shaft 3631 of each supporting component 363 respectively extend into a corresponding fixing hole 3642 of each auxiliary plate 364. In one embodiment, the abutment assembly 363 further includes a snap ring 3633. The snap ring 3633 is disposed on the support shaft 3631 and abuts against one side of the auxiliary plate 364 to limit the relative movement of the support shaft 3631 along the axial direction thereof.
Further, as shown in fig. 10, the side of the first channel plate 361 facing away from the second rotating mechanism 33 is further provided with two first clamping plates 365 spaced apart. The first card 365 is located between the two auxiliary boards 364. The rotating wheel 3632 of one of the holding assemblies 363 is clamped between the two first clamping plates 365 to limit the relative movement of the rotating wheel 3632 of the one of the holding assemblies 363 along the axial direction of its corresponding support shaft 3631.
As shown in fig. 10, further, a second card 366 is provided on the side of the first passage plate 361 facing away from the second rotation mechanism 33. The second card 366 is located between the two auxiliary boards 364. The second clamping plate 366 and the first clamping plate 365 are respectively located on the other two sides of the auxiliary opening 3611. One of the rotating wheels 3632 of the other set of holding members 363 is clamped between one of the auxiliary plates 364 and the second clamping plate 366, and the other rotating wheel 3632 of the other set of holding members 363 is clamped between the other auxiliary plate 364 and the second clamping plate 366 to restrict relative movement of the two rotating wheels 3632 of the other set of holding members 363 in the axial direction of their corresponding support shafts 3631.
As shown in fig. 7, in one embodiment, the first channel plate 361 has a rake 3612 that is bent toward a side facing away from the second rotation mechanism 33. Because the first channel plate 361 has the rake 3612 bending towards the side away from the second rotating mechanism 33, the space between the other parts of the first channel plate 361, where the rake 3612 is arranged, and the other parts of the first channel plate 361, relative to the first channel plate 361, and the second rotating mechanism 33 is larger, so that the medium between the first channel plate 361 and the second rotating mechanism 33 can be better kept away, the problem that the medium impacts the first channel plate 361 to cause the corner folding or tearing and the like due to overlarge tilting amplitude in the process of following the tape 35 transmission is avoided, the reliability of the medium transmission is improved, and the failure rate is reduced.
As shown in fig. 11 and 12, in one embodiment, the first channel plate 361 further includes a body 3613 for rotatably connecting the mounting bracket 31. The rake 3612 is provided at one end of the body 3613. In one embodiment, rocker 3612 includes a plurality of rocker corners. The plurality of rocker corners 3612 are disposed at one end of the body 3613 at intervals. In particular, in this embodiment, the rocker 3612 includes two. The two corners 3612 are disposed at one end of the body 3613 at intervals. It is to be understood that, in other embodiments, the number of the rocker angles 3612 may be one or more than three, and the specific setting manner may be reasonably selected according to the actual situation. Further, in one embodiment, rocker 3612 is integrally formed with body 3613 to facilitate the processing of the overall structure of first channel plate 361.
As shown in fig. 7 and 12, in one embodiment, the connection between the rocker 3612 and the body 3613 is smooth. When the severely tilted medium interferes with the tilt angle 3612, the connection part between the tilt angle 3612 and the body 3613 of the first channel plate 361 is in smooth transition, so that the contact part of the severely tilted medium and the tilt angle 3612 can be pressed downwards along the tilt angle 3612, the severely tilted medium is continuously close to the second rotating mechanism 33, the problems of angle folding or tearing and the like can not occur, the reliability of medium transmission is further improved, and the failure rate is reduced.
Referring to fig. 10 to 12, in the embodiment, the holding assembly 363, the auxiliary opening 3611, the auxiliary plate 364, the first clamping plate 365 and the second clamping plate 366 are all disposed on the main body 3613 of the first channel plate 361.
Further, as shown in fig. 6, in one embodiment, the guide mechanism 36 further includes a separator 367 for separating the media. The separator 367 is rotatably provided on the mounting frame 31. In particular, in this embodiment, separator 367 is positioned below first channel plate 361. A guide passage 306 for the transmission medium is formed between the first passage plate 361 and the separator 367. The guide channel 306 communicates with the transfer channel 304. This structure facilitates the medium to be transported to the tape 35 through the guide passage 306 and wound around the second rotation mechanism 33 following the tape 35 when the medium is wound up, and also facilitates the medium to be transported to the inlet and outlet 302 following the tape 35 moving through the guide passage 306 when the medium is unwound.
As shown in fig. 6, in one embodiment, the transport mechanism 37 includes a first transport assembly 372 and a second transport assembly 374. The first transmission assembly 372 is rotatably disposed on the mounting frame 31. The first transfer member 372 passes through the first channel plate 361. Specifically, the drive mechanism 34 is coupled to a first transmission assembly 372. The drive mechanism 34 is capable of driving rotation of the first transmission assembly 372 relative to the mounting bracket 31. The second transmission assembly 374 is rotatably mounted to the mounting frame 31. A second transfer assembly 374 passes through the second channel plate 362. The first and second transport assemblies 372 and 374 are used to clamp and drive media through the transport channel 304. As the media passes through the transport channel 304, the first and second transport assemblies 372 and 374 will abut the upper and lower surfaces of the media, respectively, thereby clamping and driving the media through the transport channel 304.
As shown in fig. 6, further, the first transmission assembly 372 includes two first pulleys 3722 and a first transmission belt 3724. Two first pulleys 3722 are rotatably provided on the mounting frame 31 and pass through the first passage plate 361. In this embodiment, the first transmission belt 3724 is wound around two first pulleys 3722. Referring to fig. 11, further, a body 3613 of the first channel plate 361 is provided with a clearance groove 3614. The first pulley 3722 passes through the avoidance slot 3614. The drive mechanism 34 is connected to the first pulley 3722. The drive mechanism 34 is capable of driving the rotation of the first pulley 3722 relative to the mounting frame 31.
As shown in fig. 6, the second transmission assembly 374 includes two second pulleys 3742 and a second transmission belt 3744. Two second pulleys 3742 are rotatably provided on the mounting frame 31 and pass through the second channel plate 362. The second transmission belt 3744 is wound around two second pulleys 3742. The first and second conveyor belts 3724, 3744 are juxtaposed and run in opposite directions to each other. The first and second conveyor belts 3724, 3744 are used to grip and drive the media through the conveyor channel 304.
Because the width of the transmission belt is larger, the first transmission belt 3724 and the second transmission belt 3744 can clamp and transmit media with different widths, and the winding belt 35 can wind the media with different widths on the second rotating mechanism 33, so that the media can smoothly enter and exit relative to the temporary storage device 3. The temporary storage device 3 increases the capacity of storage media, increases the compatibility of media with different widths, does not cause banknote clamping, improves the reliability of media travelling, and reduces the failure rate.
As shown in fig. 6, in an embodiment, the first transmission assembly 372 further includes a first tensioning wheel 3726 for tensioning the first transmission belt 3724. The first tensioning wheels 3726 are rotatably disposed on the mounting frame 31 and are located between the two first pulleys 3722. One end of the first transmission belt 3724 is disposed on one of the first pulleys 3722, and the other end is disposed on the other first pulley 3722 around the first tensioning pulley 3726. This structure enables the first and second transfer belts 3724 and 3744 to reliably hold and transfer the medium.
Further, as shown in fig. 6, the second transmission assembly 374 further includes a second tensioning wheel 3746 for tensioning the second transmission belt 3744. A second tensioning wheel 3746 is rotatably mounted to the mounting frame 31 and is positioned between the two second pulleys 3742. One end of the second transmission belt 3744 is provided on one of the second pulleys 3742, and the other end passes around the second tensioning pulley 3746 and is provided on the other second pulley 3742.
Further, as shown in fig. 6, in the present embodiment, the first detector 391, the second detector 392 and the third detector 393 each include two. Two first detectors 391 are spaced apart on the tensioning mechanism 38. Two second detectors 392 are provided on the first channel plate 361 and the second channel plate 362, respectively, and are located on both sides of the transmission channel 304. Two third detectors 393 are located on either side of the drum 334.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.