English Translation of PCT/CN2013/078105 PAPER SHEET TYPE MEDIUM STACKING DEVICE [00011 This application claims the benefit of priority to Chinese Patent Application No. 201210448733.2 titled "SHEET-TYPE MEDIA STACKING DEVICE", filed with the 5 Chinese State Intellectual Property Office on November 09, 2012, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD [00021 The present application relates to a technique for processing a sheet-type medium, and particularly to a device through which the sheet-type media are stacked piece by piece 10 and a whole stack of media don't wriggle and draw back. BACKGROUND [00031 A device for identifying financial bills piece by piece is generally installed in the machine for processing financial bills, and after being identified piece by piece, the bills which are conveyed piece by piece are stacked to facilitate withdrawing the bills. For example, 15 in a conventional automatic teller machine, multiple sheets of stacked banknotes are sorted, conveyed and identified piece by piece, and then are stacked to be delivered out. At present, in a sheet-type media stacking device, in which the media are conveyed in a longitudinal direction, such as a banknote stacking device, a conveyor belt fits closely to an arc-shaped plate to convey a single sheet of banknote to a specific location to be stacked. For example, 20 the first sheet of banknote is settled in the specific location, a front end of the second sheet of banknote is superposed on a tail end of the first sheet of banknote, and the first sheet of banknote and the second sheet of banknote are clamped by the conveyor belt and the arc-shaped plate to move forwards together, and the first sheet of banknote stops moving forward when its front end reaches a predetermined blocking member. The second sheet of 25 banknote is driven by the conveyor belt to overcome the frictional force between the first and second banknotes and continue to slide forward, and stops moving forward until it reaches the predetermined blocking member. The third sheet of banknote and subsequent banknotes go through the same process as the first and second sheets of banknotes, that is, the front end of a subsequent sheet of banknote is superposed on the tail end of a previous banknote and the -1 - English Translation of PCT/CN2013/078105 banknotes are all conveyed to the predetermined blocking member, to be stacked. Eventually, the front ends of all the banknotes are aligned to the predetermined movable blocking plate, and a whole stack of banknotes are delivered to a predetermined position for an operator. [00041 With the development of technology, the processing speed of a sheet-type media 5 processing device is greatly increased, requirements for movement speeds of the sheet-type media in a device are increased accordingly, however in the above conventional mechanism, for ensuring that the front end of a subsequent sheet of banknote can be superposed on the tail end of a previous sheet of banknote, the previous sheet of banknote must stop at a predetermined position, the conveyor belt must start instantaneously at a high acceleration to 10 reach the same linear speed as other devices after the front end of the subsequent sheet of banknote is superposed on the tail end of the previous sheet of banknote for a certain distance, the conveyor belt is stretched in the process, a driving force for the conveyor belt stops when the banknotes moves to the predetermined position, and the conveyor belt rebounds to drive the banknotes to wriggle and draw back, thus front ends of the banknotes form an inverted 15 triangle slope, and the banknotes sent to users in a whole stack show an unsatisfactory banknote stacking effect. SUMMARY [00051 An object of the present application is to provide a sheet-type media stacking device for effectively addressing the issue of a whole stack of media wriggling and draw backing. 20 [00061 The sheet-type media stacking device includes: a piece-by-piece sheet-type media conveying mechanism configured to convey a sheet-type medium piece by piece; an upper conveyor belt configured to provide a driving force to the sheet-type media and arranged around a driving transmission shaft and a driven transmission shaft which are 25 arranged in a conveying direction of the sheet-type media; an arc-shaped stacking plate configured to support the sheet-type media, wherein an arc-shaped surface, fitting closely to the upper conveyor belt, of the arc-shaped stacking plate defines a conveying passage for the sheet-type media, a length of the conveying passage is at least greater than a length of one sheet of the sheet-type medium in the conveying direction, -2- English Translation of PCT/CN2013/078105 and one end of the conveying passage abuts the piece-by-piece sheet-type media conveying mechanism and is slightly lower than a delivering outlet of the conveying mechanism, and another end of the conveying passage forms an outlet for a whole stack of sheet-type media; a movable blocking mechanism arranged on a section of the conveying passage close 5 to the outlet and configured to selectively block the sheet-type media; a sensor device arranged at a tail end of the delivering outlet of the piece-by-piece sheet-type media conveying mechanism and configured to detect the arrival and passing of a sheet of the sheet-type media; and a control unit configured to control the upper conveyor belt to move or stop moving 10 according to information feedback from the sensor device; wherein, an acanthus-shaped protruding rib is arranged at a position, at a distance of a length of one sheet of the sheet-type medium from the movable blocking mechanism, on the arc-shaped surface of the arc-shaped stacking plate, and the acanthus-shaped protruding rib allows the sheet-type media to pass only in a discharging direction. 15 [00071 Preferably, at least two acanthus-shaped protruding ribs are provided, and the at least two acanthus protruding ribs are arranged in a front-rear order along the discharging direction of the sheet-type media. [00081 Preferably, the arc-shaped stacking device includes the following three sections, a section near the piece-by-piece sheet-type media conveying mechanism forms a rear 20 arc-shaped plate, a section near the outlet for media forms a front arc-shaped plate, and a middle section forms a reversing device. [00091 Furthermore, a recycling conveyor belt assembly and a discharging conveyor belt assembly are arranged below the reversing device and the front arc-shaped plate, wherein at least a section of the recycling conveyor belt assembly fits with a section of the discharging 25 conveyor belt assembly to form a recycling conveying passage for the sheet-type media. [00101 Preferably, one surface, facing to the movable blocking mechanism, of the acanthus protruding rib is perpendicular to the conveying passage to form a stop surface; one surface, opposite to the stop surface, and the conveying passage form an angle greater than 90 degrees and less than 180 degrees so as to form a derivation surface. 30 [00111 Compared with the conventional technology, the valuable document identification -3- English Translation of PCT/CN2013/078105 device has the following advantages. [00121 By providing acanthus-shaped protruding ribs on the working surface of the arc-shaped stacking plate, the acanthus-shaped protruding ribs have a one-way transmission property for the sheet-type media and each of the acanthus-shaped protruding ribs has the 5 derivation surface and the stop surface, thus the sheet-type media may only be transmitted along one direction and the movement thereof is irreversible, which effectively solves the problem of wriggling and draw backing of the sheet-type media caused by the rebound action of the conveyor belt, and the stacking of the sheet-type medias may reach the expected effect. BRIEF DESCRIPTION OF THE DRAWINGS 10 [00131 The present application is further described in conjunction with accompany figures and embodiments. [00141 Figure 1 is a schematic view showing the structure of a sheet-type media stacking device according to the present application; [00151 Figure 2 is a schematic view of a stacking and withdrawing device of the sheet-type 15 media stacking device in Figure 1; [00161 Figure 3 is a partial schematic view of a reversing device of the stacking and withdrawing device in Figure 2; [00171 Figure 4 is a side view of the reversing device in Figure 3; [00181 Figure 5 is a schematic view showing the depositing and withdrawing process of the 20 sheet-type media stacking device in Figure 1; [00191 Figure 6 is a side view showing the stacking and withdrawing device in Figure 2 with a movable blocking plate in an open state and a reversing device at a second position; [00201 Figure 7 is an axonometric view of the stacking and withdrawing device in Figure 2; [00211 Figure 8 is a side view of a first conveyor belt assembly of the stacking and 25 withdrawing device in Figure 2; [00221 Figure 9 is an axonometric view of a second conveyor belt assembly and a third conveyor belt assembly of the stacking and withdrawing device in Figure 2; -4- English Translation of PCT/CN2013/078105 [00231 Figure 10 is a side view of the second conveyor belt assembly and the third conveyor belt assembly of the stacking and withdrawing device in Figure 2; [00241 Figure 11 is a side view of the second conveyor belt assembly and the third conveyor belt assembly of the stacking and withdrawing device in Figure 2 when the floating 5 support is at a second position; [00251 Figure 12 is a flow diagram showing the stacking and withdrawing device conveying a first sheet of banknote and a second sheet of banknote; [00261 Figure 13 is a schematic view of a control system of the sheet-type media stacking device in Figure 1; 10 [00271 Figure 14 is a schematic view showing sheet-type media at the position of acanthus-shaped protruding ribs of the arc-shaped stacking plate in the stacking process; [00281 Figure 15 is a schematic view showing banknotes being stacked and aligned in the stacking and withdrawing device in Figure 2; and [00291 Figure 16 is a schematic view showing a whole stack of banknotes being delivered 15 out by the stacking and withdrawing device in Figure 2. DETAILED DESCRIPTION [00301 For further describing the sheet-type media stacking device according to the present application and for more clearly illustrating the structure and operation process of the device, a deposit machine used in a financial self-service equipment is described as an example. 20 Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all of other embodiments, made by the person skilled in the art without any creative efforts, fall into the scope of the present application. [00311 Reference is made to Figure 1, which is a schematic view showing the structure of a 25 sheet-type media stacking device (a deposit machine). The deposit machine has a depositing port 101, a sheet separating device 1, a sheet tilt correction device 2, a sheet identifying device 3, a temporary storage device 4, a stacking and withdrawing device 5 and a storage box 6. The sheet separating device 1 separates banknotes at the depositing port 101 piece by piece and delivers the separated banknotes into the deposit machine. The sheet tilt correction -5- English Translation of PCT/CN2013/078105 device 2 is configured to adjust the banknotes inclined with respect to an advancing direction and align the banknotes with a datum plane in parallel with the advancing direction. The sheet identifying device 3 is configured to identify the authenticity, the face value, the obverse and reverse, and the condition of banknotes and checks, to detect whether the sheets are conveyed 5 abnormally, such as being titled, overlapped or continuous, to determine whether the sheets can be stored. The temporary storage device 4 is configured to temporarily store banknotes or checks which are identifiable and are determined as not being conveyed abnormally. The stacking and withdrawing device 5 is configured to stack banknotes or checks, to deliver out returned banknotes or checks, and to withdraw the banknotes or checks that customers forget 10 to withdraw. Conveying mechanisms 102, 103, 104 and 105 for conveying sheet-type media piece by piece are provided between the above devices to convey banknotes. [00321 Reference is made to Figure 2. The stacking and withdrawing device 5 includes an upper conveyor belt 153 configured to provide a driving force to the sheet-type media, an arc-shaped stacking plate for supporting the sheet-type media, a movable blocking mechanism 15 20 for selectively blocking the sheet-type media, a sensor device 17 and a control unit. The upper conveyor belt 153 is arranged around a driving transmission shaft 151 and a driven transmission shaft 156 which are arranged in a conveying direction of the sheet-type media. The arc-shaped stacking plate includes three sections. The section, near the conveying mechanism for conveying sheet-type media piece by piece, forms a rear arc-shaped plate 18. 20 The section near an outlet for media forms a front arc-shaped plate 19. And the middle section forms a reversing device 25. The upper conveyor belt fits closely to the arc-shaped surface of the arc-shaped stacking plate, thereby forming a conveying passage for the sheet-type media. The length of the conveying passage is at least greater than the length of one sheet of the sheet-type medium in the conveying direction. One end of the conveying passage abuts the 25 conveying mechanism 105 for conveying sheet-type media piece by piece and is slightly lower than a delivering outlet of the conveying mechanism. The other end of the conveying passage forms the outlet for a whole stack of sheet-type media. The movable blocking mechanism 20 is arranged on a section of the conveying passage close to the outlet. The sensor device 17 is arranged at the tail end of the delivering outlet of the conveying 30 mechanism for conveying sheet-type media piece by piece and is configured to detect the arrival and passing of a sheet of the sheet-type medium. The control unit is configured to control the upper conveyor belt 153 to move or stop moving according to the information -6- English Translation of PCT/CN2013/078105 feedback from the sensor device 17, thereby connecting the adjacent sheet-type media, entering into the arc-shaped stacking device, end to end. For facilitating discharging or recycling the whole stack of sheet-type media, a first conveyor belt assembly 15 is provided corresponding to the upper conveyor belt 153, a second conveyor belt assembly 22 is 5 provided corresponding to the front arc-shaped plate 19, and a third conveyor belt assembly 23 is provided corresponding to the reversing device 25, in view of the three-section design of the arc-shaped plate. [00331 Combining Figure 3 with Figure 4, an acanthus-shaped protruding rib 252 is provided on a working surface 251 of the reversing device 25 in the arc-shaped stacking plate, 10 the acanthus-shaped protruding rib 252 allows the sheet-type media to pass only in a discharging direction. Preferably, in this embodiment, two acanthus-shaped protruding ribs 252 are provided and are arranged in a front-rear order along the discharging direction of the sheet-type media. One surface, facing to the movable blocking mechanism 20, of each of the acanthus-shaped protruding ribs 252 is perpendicular to the conveying passage to form a stop 15 surface 254, and an angle which is greater than 90 degrees and less than 180 degrees is formed between one surface of each of the acanthus-shaped protruding ribs 252 opposite to the stop face 254 and the conveying passage to form a derivation surface 253. The acanthus-shaped protruding ribs 252 added on the working surface 251 effectively solve the problem that the sheet-type media wriggle and draw back due to the rebound action of the 20 conveyor belt, thus the stacking of the sheet-type media may reach the expected effect. [00341 Referring to Figure 1, the specific working process of the deposit machine is illustrated herein. When depositing, a customer puts one or more sheets of banknotes at the depositing port 101, and the banknotes are separated by the sheet separating device 1 piece by piece and then passes through the sheet tilt correction device 2 and the sheet identifying 25 device 3. The banknotes determined to be normal and the face value of which has been identified or the checks which are identifiable enter into the temporary storage device 4 via a route 102. The banknotes or checks which are unidentifiable are returned to the stacking and withdrawing device 5 via a route 103 and a route 105, and then are aligned and stacked at the stacking unit 51, and the returned banknotes are stacked and then delivered out after the 30 banknotes at the depositing port 101 are completely separated. When it is determined that the returned banknotes or checks are not withdrawn by the operator in a specified time, the banknotes or checks are recycled to the recycling unit 52. -7- English Translation of PCT/CN2013/078105 [00351 Referring to Figure 5, the banknotes depositing process and returning process of the deposit machine are described herein. After the banknotes are completely separated piece by piece, the banknotes detected determined to be normal and the face value of which has been identified are conveyed into the temporary storage device 4 to wait for the banknote 5 depositing confirmation of a customer. If the customer confirms depositing, the banknotes are conveyed out of the temporary storage 4 and then conveyed into the storage box 6 via a route 104, thereby implementing the banknotes depositing process. If the customer cancels depositing, the banknotes are conveyed out of the temporary device 4 and conveyed to the stacking and withdrawing device 5 via the route 105, and then are aligned and stacked in the 10 stacking unit 51, and finally are stacked and then delivered out, thereby implementing the banknotes returning process. When it is determined that the returned banknotes are not withdrawn by the customer in a specific time, the banknotes are recycled to the recycling unit 52. [00361 Reference is made to Figure 2 and Figure 6. The banknotes are returned via the route 15 105 and are clamped between an upper delivering conveyor belt 11 and a lower delivering conveyor belt 12 piece by piece to be conveyed to the stacking and withdrawing device 5. An upper guiding board 13 and a lower guiding board 14 are arranged in the advancing direction of the discharged banknotes. The first conveyor belt assembly 15 arranged in parallel to the advancing direction of the banknotes is provided in front (the rightward direction in the 20 figures) of the upper guiding board 13. A first sensor device 17 is arranged between the driving roller 151 and the delivering roller 16, and is configured to detect each sheet of discharged banknote. The rear arc-shaped plate 18, the front arc-shaped plate 19 and the reversing device 25 which have similar curvatures are provided below the first conveyor belt assembly 15, and a rear-end plane 181 of the rear arc-shaped plate 18 is obviously lower than 25 the outlet (a port for discharging the banknotes) formed between the upper delivering conveyor belt 11 and the lower delivering conveyor belt 12. Above the front section of the front arc-shaped plate 19, the movable blocking plate 20 is pivotally mounted on a mandrel 152 and has two working states, including a closed state as shown in Figure 2 and an open state as shown in Figure 6. A second sensor device 21 is fixed in front of the movable 30 blocking plate 20 and is configured to detect the presence of banknotes in front of the movable blocking plate 20 and above the front arc-shaped plate 19. The adjustable second conveyor belt assembly 22 is arranged below the front arc-shaped plate 19, and the third -8- English Translation of PCT/CN2013/078105 conveyor belt assembly 23 is arranged at a corresponding position at the rear end of the second conveyor belt assembly 22. The first conveyor belt assembly 15, the second conveyor belt assembly 22 and the third conveyor belt assembly 23 are driven by the same power. A storage container 24 is arranged below the recycling unit 52, and an inlet of the storage 5 container 24 is corresponding to a conveying port formed by a recycling floating roller 221 of the second conveyor belt assembly 22 and a driving roller 231 of the third conveyor belt assembly 23. The reversing device 25 is arranged between the rear arc-shaped plate 18 and the front arc-shaped plate 19 and above the conveying port formed by the recycling floating roller 221 and the driving roller 231, and is pivotally mounted on a mandrel 26, and has two 10 working states, including a first position as shown in Figure 2 and a second position as shown in Figure 6. [00371 Referring to Figure 7 and Figure 8, the first conveyor belt assembly 15 is illustrated in detail. A first conveyor belt 153 (that is the upper conveyor belt) of the first conveyor belt assembly 15 is arranged around the driving roller 151, a roller 154, a roller 155 and the pinch 15 roller 156. The lower section of the first conveyor belt 153 is tensed by the upper surfaces of the rear arc-shaped plate 18 and the front arc-shaped plate 19. The pinch roller 156 is fixed at the front end of the pressing plate 158 via a mandrel 157, and the pressing plate 158 is swingable around the mandrel 152. [00381 Referring to Figures 9 to 11, the second conveyor belt assembly and the third 20 conveyor belt assembly of the stacking and withdrawing device are illustrated. Two abreast second conveyor belts 222 of the second conveyor belt assembly 22 are arranged around the recycling floating roller 221, the second driving roller 223, a second pinch roller 224 and a tensioning roller 225. The second pinch roller 224 is directed to the pinch roller 156 of the first conveyor belt assembly 15. The recycling floating roller 221 is mounted on a recycling 25 floating support 226 through a pair of bearings and is swingable around a mandrel 227. A banknote-delivering floating support 229 swingable around a mandrel 228 is mounted at a front end of the second conveyor belt assembly 22, and has two working states, including a first position as shown in Figure 10 and a second position as shown in Figure 11. The swinging of the delivering floating support 229 and the movable blocking plate 20 are driven 30 by the same power. The delivering floating support 229 is provided with two rows of roller sets 230 corresponding to the second conveyor belt 222. The roller sets 230 may make the working surface of the second conveyor belt 222 higher or lower than the upper arc-shaped -9- English Translation of PCT/CN2013/078105 surface of the front arc-shaped plate 19 through the swinging of the delivering floating support 229. A third conveyor belt 233 of the third conveyor belt assembly 23 is arranged around a third driving roller 232 and the third driven roller 231. [00391 Referring to Figures 12 to 16, the process for realizing the function of the stacking 5 and withdrawing device is illustrated. When the banknotes are to be returned, the movable blocking plate 20 is in the closed state as shown in Figure 12, to prevent the banknotes from moving in the advancing direction of banknotes. The delivering floating support 229 is in the first position, to make the working surface of the upper section of the second conveyor belt 222 lower than the upper arc-shaped surface of the front arc-shaped plate 19, thus, when 10 slipping along the arc-shaped plate, the banknotes will not contact the working surface of the second conveyor belt 222. The reversing device 25 is in the first position, to allow the banknotes to pass along the arc-shaped surface smoothly. The first sheet of banknote 27 is delivered out by the upper delivering conveyor belt 11 and the lower delivering conveyor belt 12, the front end of the banknote passes through the first sensor device 17 (an acquisition 15 module), the sensor 17 feeds back an information to a processing module of the control system, and the processing module processes the information and then sends out a signal, to start a first driving motor (an execution module) immediately or start the first driving motor after a period of time, thereby driving the first conveyor belt assembly 15, the second conveyor belt assembly 22 and the third conveyor belt assembly 23 to rotate in the direction 20 shown in Figure 12. The first conveyor belt assembly 15 cooperates with the rear arc-shaped plate 18 to convey the banknote forward, the sensor 17 feeds back an information to the processing module of the control system when the tail end of the banknote leaves the first sensor device 17, and the processing module processes the information and sends out a signal to stop the first driving motor, and in this case, all of the conveyor belt assemblies are stopped, 25 the banknote stops at position 182 with the tail end being exposed behind the first conveyor belt assembly 15. When the second sheet of banknote 28 is delivered out, the front end of the second sheet of banknote passes through the first sensor device 17, the first sensor device 17 feeds back an information to the control system, and the control system sends out a signal for starting the first driving motor, to start the first driving motor immediately or after a period of 30 time, thereby driving the first conveyor belt assembly, the second conveyor belt assembly and the third conveyor belt assembly to rotate in the direction shown in Figure 13. The front end of the second sheet of banknote 28 is superposed on the tail end of the first sheet of banknote -10- English Translation of PCT/CN2013/078105 27, and the two sheets of banknotes which are partially overlapped are conveyed forward together by the first conveyor belt assembly 15. After the tail end of the second sheet of banknote leaves the first sensor device 17, the first sensor device 17 feeds back information to the control system, and the control system stops the first driving motor, and the second sheet 5 of banknote stops at the position 182. The third sheet of banknote and the subsequent banknotes are conveyed in the same manner, in which the front end of a subsequent sheet of banknote is superposed on the tail end of a previous sheet of banknote. When the front end of the first sheet of banknote 27 reaches the movable blocking plate 20, the banknote is prevented from moving forward, a bottom surface of the first sheet of banknote 27 fits closely 10 to the acanthus-shaped protruding ribs 252 of the reversing device 25, the tail end of the banknote is blocked by the stop surface 254, the banknote slips with respect to the first conveyor belt 153, and the first sheet of banknote 27 is blocked in the wriggling direction, thus may not wriggle and draw back. As shown in Figure 15, the third sheet of banknote and the subsequent banknotes go through the same process, and the front ends thereof are 15 eventually aligned to the movable blocking plate 20. [00401 After all of the banknotes are delivered out, that is, the banknotes have been processed, the control system sends out a signal to control the second motor, to shift the movable blocking plate 20 to the open state as shown in Figure 16, thereby removing the blockage in the advancing direction of the banknotes. Meanwhile, the delivering floating 20 support 229 is shifted to the second position to make the working surface of the second conveyor belt 222 higher than the upper arc-shaped surface of the front arc-shaped plate 19, thus the working surface of the second conveyor belt 222 is in contact with the banknotes. The first driving motor is started to drive the first conveyor belt assembly, the second conveyor belt assembly and the third conveyor belt assembly to rotate in the direction shown 25 in Figure 16. The banknotes are clamped between the first conveyor belt assembly 15 and the second conveyor belt assembly 22 to be delivered out, and the pressing plate 158 may automatically adjust the gap between the pinch roller 156 and the second pinch roller 224 according to the total thickness of the banknotes. According to the time counting of the controlling program, the transmission structure stops the conveyor belts when the banknotes 30 are delivered out for a certain distance, and the tail ends of the banknotes are clamped between the pinch roller 156 and the second pinch roller 224, thereby accomplishing the delivering process. In the case that the whole stack of the delivered banknotes haven't been -11- English Translation of PCT/CN2013/078105 withdrawn by the operator timely, the movable blocking plate 20 and the reversing device 25 of the stacking and withdrawing device are shifted to the position as shown in Figure 7, the control system controls the first conveyor belt assembly, the second conveyor belt assembly and the third conveyor belt assembly to rotate in the reversed direction, and the whole stack of 5 banknotes are conveyed reversely under the action of the first conveyor belt assembly and the second conveyor belt assembly and guided into the recycling box 52 by the reversing device 25 in the reverse conveying process. [00411 The embodiments described hereinabove are only preferred embodiments of the present application, and should not be interpreted as limitation to the present application. The 10 technical solutions claimed by the present application not only can be applied to the financial field for processing banknotes, but also can process checks or other whole stack of sheet-type media which are required to be separated piece by piece. Therefore, for those skilled in the art, a few of modifications and improvements may be made without departing from the spirit and scope of the present application, and theses modifications and improvements are also deemed 15 to fall into the scope of the present application. - 12 -