WO2012083778A1

WO2012083778A1 - Method and apparatus for detecting double-fed media and medium processing apparatus

Info

Publication number: WO2012083778A1
Application number: PCT/CN2011/082672
Authority: WO
Inventors: 张俊杰; 郑阳阳; 高晓燕; 车磊
Original assignee: 山东新北洋信息技术股份有限公司
Priority date: 2010-12-20
Filing date: 2011-11-23
Publication date: 2012-06-28
Also published as: CN102556708A

Abstract

Disclosed in the present invention are a method and an apparatus for detecting double-fed media. The method for detecting double-fed media includes: during the process of feeding media, detecting whether the media reach a first position where the media are located between a first pinch mechanism (11) and a second pinch mechanism (12) of a pinch assembly (1); When the media reach the first position, controlling the first pinch mechanism (11) and the second pinch mechanism (12) to perform a relatively pinching motion along the media feeding direction, and continuously feeding the media to make it pass through a second position where a sensor (21) is arranged, the sensor (21) is used to detect whether the media are double-fed. The method can simply and conveniently detect whether the media are double-fed. A medium processing apparatus is also disclosed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of medium multi-sheet detection, and in particular to a medium multi-sheet detection method and apparatus, and a medium processing apparatus. BACKGROUND OF THE INVENTION Conventional media processing devices, such as printers, scanners, and media handling devices of media processing devices, when transporting media one by one, sometimes cause multiple media to be overlapped and transported due to electrostatic adsorption or moisture, etc. Create a paper jam problem. In this regard, Japanese Patent Laid-Open No. 56-23150 provides a solution, as shown in Figures la and lb, which provides a multi-sheet detecting mechanism comprising a paper displacement assembly 15 and a detection sensor 16. The displacement assembly 15 includes a roller 13 and a resistance member 14 that are in contact with the sheet, and the resistance member 14 is disposed opposite to the roller 13 by a sheet thickness of 1; the detecting sensor 16 is a photosensor. When the overlapping banknotes are transported, the upper and lower banknotes are relatively displaced by the action of the resisting member 14 when passing through the positional assembly 15, and at this time, the banknotes are tilted by the transport roller 18. As a result, the length of the banknotes in the direction perpendicular to the paper feed direction is increased, so that the sensor 16 detects the banknotes, thereby judging that the banknotes overlap. The problem with this solution is that the distance between the resisting member 14 and the roller 13 must be set in advance equal to the thickness of the sheet of paper, and then the overlapping bills can be dialed by the resisting member 14 to cause relative displacement of the overlapping bills. Thus, the sensor 16 In order to judge whether the banknotes overlap. Therefore, for media of different thicknesses, it is necessary to set the distance between the resistance member 14 and the roller 13 before use, so that there is a problem that the operation is cumbersome and difficult to use. SUMMARY OF THE INVENTION The present invention has been made in view of the problem that the conventional media processing device is cumbersome and difficult to use when detecting whether the medium is re-tensioned. Therefore, the main object of the present invention is to provide a method and device for detecting media re-tensioning and media processing. Device to solve the above problem. In order to achieve the above object, according to an aspect of the present invention, a medium multi-sheet detecting method is provided. The medium multi-sheet detecting method includes: detecting, during the medium conveying, whether the medium reaches the first position, wherein, in the first position, the medium is located between the first pick-up mechanism and the second pick-up mechanism of the pick-up assembly; When the medium reaches the first position, controlling the first pick-up mechanism and the second pick-up mechanism to perform a relative pick-up motion along the transport direction of the medium; continuing to transport the medium to pass the medium to the second position, wherein the second position is provided with a sensor Use the sensor to detect if the media is re-stretched. In order to achieve the above object, according to another aspect of the present invention, a medium multi-sheet detecting device is provided. The medium multi-sheet detecting device includes: a conveying mechanism including a crepe paper assembly for conveying a medium, wherein the crepe paper assembly includes a first crepe paper mechanism and a second crepe paper mechanism; and a first sensor for the medium Detecting whether the medium reaches a first position when transporting in the first direction, wherein, in the first position, the medium is located between the first pick-up mechanism and the second pick-up mechanism; And controlling the first pick-up mechanism and the second pick-up mechanism to perform a pick-up motion in the first direction when the medium reaches the first position, and controlling the transport mechanism to continue The medium is conveyed to pass the medium through the second position; and a second sensor is disposed at the second position for detecting whether the medium is re-tensioned. In order to achieve the above object, according to another aspect of the present invention, a medium processing apparatus is provided. The media processing device includes the media multi-sheet detecting device of the present invention. According to the present invention, it is detected whether the medium reaches the first position during the conveyance of the medium, wherein, in the first position, the medium is located between the first pick-up mechanism and the second pick-up mechanism of the pick-up assembly; In one position, controlling the first pick-up mechanism and the second pick-up mechanism to perform a relative pick-up motion along the transport direction of the medium; continuing to transport the medium to pass the medium through the second position, wherein the sensor is disposed at the second position; Check if the media is re-expanded. According to the present invention, there is provided a medium multi-sheet detecting method which, by performing a pick-up motion at a first position, detects whether a medium is re-tensioned by a sensor output signal at a second position, can be applied to media of different thicknesses, and solves the existing medium processing. The device is cumbersome to operate when detecting whether the medium is re-tensioned, and is difficult to use, thereby achieving the effect of easily detecting whether the medium is re-tensioned. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1a is a plan view showing a structure of a multi-sheet detecting mechanism provided by Japanese Patent Laid-Open No. 56-23150 according to the related art; FIG. 1b is a cross-sectional view showing the structure of the multi-sheet detecting mechanism shown in FIG. FIG. 3 is a plan view showing the structure of the medium multi-sheet detecting mechanism shown in FIG. 2; FIG. 4a is a first type of the medium multi-sheet detecting mechanism according to an embodiment of the present invention; FIG. 4b is a flowchart of a second multi-sheet detecting method of the medium multi-sheet detecting mechanism according to an embodiment of the present invention; 5 is a plan view showing a structure of a second embodiment of a medium multi-sheet detecting mechanism according to an embodiment of the present invention; and FIG. 6 is a flowchart of a third multi-sheet detecting method of the medium detecting mechanism according to FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. 2 is a longitudinal cross-sectional view showing a first embodiment of a medium multi-sheet detecting mechanism according to an embodiment of the present invention; and FIG. 3 is a plan view showing the structure of the medium multi-sheet detecting mechanism shown in FIG. 2. As shown, the medium multi-sheet detecting apparatus according to an embodiment of the present invention includes: a conveying mechanism including a pickup unit 1 for conveying a medium, wherein the pickup unit 1 includes a first pickup mechanism (for example, a driving roller) 11) and a second pickup mechanism (for example, the driven roller 12); the first sensor, configured to detect whether the medium reaches the first position when the medium is conveyed in the first direction, wherein, in the first position, the medium is located at the first position Between a stack of paper mechanisms and a second pick-up mechanism; a controller (not shown) for controlling the first pick-up mechanism and the second pick-up mechanism to perform in the first direction when the medium reaches the first position Relative to the squeegee movement, and controlling the conveying mechanism to continue to convey the medium to pass the medium to the second position; the second sensor is disposed at the second position for detecting whether the medium is re-tensioned. It should be noted that the second sensor and the first sensor may be provided as the same sensor, for example, both of the sensors 21, or may be separately provided sensors. Preferably, the first sensor and the second sensor are the same sensor and are disposed at the second position. Therefore, it is possible to realize whether the detecting medium is re-expanded and the detecting medium reaches the first position by using the same sensor, thereby simplifying the structure and saving the cost. The above-described conveying mechanism may include only the pickup unit 1, or may include other conveying mechanisms in addition to the pickup unit 1. Preferably, the crepe paper assembly 1 can be used as a transport mechanism alone, so that it is no longer necessary to separately provide other transport mechanisms, thereby simplifying the structure and saving cost. Preferred embodiments of the present invention are described below in conjunction with FIGS. 2 and 3. As shown in the figure, the medium multi-sheet detecting mechanism provided by the present invention comprises a frame 5, a pickup unit 1, a detecting unit 2, a driving mechanism 6, and a controller. The frame 5 includes a first passage plate 51 and a second passage plate 52 which are disposed in parallel with each other, and both form a paper feed path for conveying a medium, and at one end of the paper feed path, an inlet 53 communicating with the outside is provided. The pickup assembly 1 is located downstream of the inlet 53 in the direction of media transport. The pickup assembly 1 includes a drive roller 11, a driven roller 12, and a one-way bearing 13. The drive roller 11 is supported by the frame 5, disposed perpendicular to the media conveying direction, on one side of the paper path. The driving roller 11 includes a first mandrel 111 and a first one disposed on the outer circumference of the first mandrel 111 a roller 112, wherein the first mandrel 111 is supported on the frame 5 perpendicular to the medium conveying direction; the first roller 112 may be an integral roller whose length is adapted to the maximum medium width, or may be along the first The mandrel 111 is axially spaced apart from the segmented rollers. In this embodiment, the first roller 112 is an integral roller having a length corresponding to the maximum medium width, located on a side close to the second passage plate 52, and The second opening 521 on the second passage plate 52 cooperates, and the first roller 112 extends into the paper path through the second opening 521 in the second passage plate 52. The driven roller 12 is tangential to the driving roller 11, and is located on the other side of the paper path, and includes a second mandrel 121 and a second roller 122 disposed on the outer circumference of the second mandrel, wherein the second mandrel 121 is parallel to the active The first mandrel 111 of the roller 11 is supported on the frame 5, and the second roller 122 may be an integral roller having a length corresponding to the length of the first roller 112, or may be an axis along the second spindle 121. The plurality of segmented rollers arranged in the interval, the second roller 112 in the embodiment is two segmented rollers arranged axially spaced along the second mandrel 121, and correspondingly disposed on the first channel plate 51. The first opening 511 is matched, and the second roller 122 extends into the paper path through the first opening 511 to tangentially cooperate with the first roller 112. The one-way bearing 13 may be provided with one or two, and is sleeved on the second mandrel 121 end or both ends of the driven roller 12 for restricting the driven roller 12 to rotate only in one direction. In this embodiment, two one-way bearings are respectively sleeved on both ends of the second mandrel 121 of the driven roller 12 and hinged on the frame 5 to restrict the driven roller 12 from rotating in only one direction. For convenience of description, the moving direction of the medium from the inlet 53 to the pickup unit 1 is referred to as a first direction, and the opposite direction is referred to as a second direction. In the present embodiment, the one-way bearing 13 restricts the driven roller 12 only. Rotate as the media moves in the first direction. The driving mechanism 6 is drivingly coupled to the shaft end of the first spindle 111 of the driving roller 11 for driving the driving roller 11 to rotate. The detecting assembly 2 includes a sensor 21, which is located downstream of the pick-up assembly 2 in the media feed direction, spaced apart from the pick-up assembly 2 by a set distance. In this embodiment, the sensor 21 is a transmissive sensor, and includes an arc tube 211 and a receiving tube 212 respectively disposed on opposite sides of the paper path, and the receiving tube 212 can receive the light emitted by the arc tube 211. When no medium passes between the light-emitting tube 211 and the receiving tube 212, the receiving tube 212 receives the light intensity maximum, so the receiving tube 212 outputs a first electrical signal, such as a first voltage value or a first current value; when the light-emitting tube 211 and When a single medium passes between the receiving tubes 212, the medium blocks the light beam emitted from the light emitting tube 211 to the receiving tube 212, so that the receiving tube 212 can only receive the light transmitted from the single sheet medium, so the receiving tube 212 outputs the second electrical signal. , such as the second voltage value or the second current value. When two or more media are passed between the light-emitting tube 211 and the receiving tube 212, the thickness of the medium increases, and the light transmitted through the medium is reduced. Therefore, the intensity of the light received by the receiving tube is reduced. Small, even barely receiving light, the receiving tube 211 outputs a third signal, such as a third voltage value or a third current value. Therefore, as the receiving tube 211 receives the decrease in the intensity of the light, the first electrical signal, the second electrical signal, and the third electrical signal change in a decreasing or increasing manner, and at the same time, since the third electrical signal is based on the second electrical signal. The relative change produced, therefore, the relative change between the second electrical signal and the third electrical signal is independent of the thickness of the sheet of media. Taking the electrical signal outputted by the receiving tube 211 as a voltage value, the first voltage value outputted by the paperless state receiving tube 211 is set to a high level, that is, the stronger the light received by the receiving tube 211, the larger the output voltage value thereof is. , there is a paper state, whether single or multiple, the voltage value outputted by the receiving tube 211 is low level, and The second voltage value outputted by the receiving tube 211 when the sheet is larger than the third voltage value outputted by the receiving tube 211 when a plurality of sheets are taken. Similarly, the first voltage value outputted by the paperless state receiving tube 211 is set to a low level, that is, the stronger the light received by the receiving tube 211 is, the smaller the output voltage value is, the paper state, whether single or multiple When the voltage value of the output of the receiving tube is high, and the second voltage value output by the receiving tube 211 is smaller than the third voltage value output by the receiving tube 211 when the sheet is a sheet. Therefore, by detecting the output signal of the sensor 21, regardless of the thickness of the sheet medium, it is possible to judge whether or not the medium exists in the paper path, and whether the medium is re-tensioned. The controller is electrically connected to the detecting component 2 and the driving mechanism 6. The controller controls the driving mechanism 6 to drive the movement of the pickup unit 1 according to the output signal of the detecting component 2, and determines whether the medium exists according to the signal output by the detecting component 2, and whether the medium is heavy. Zhang. It should be noted that the medium in the present invention is usually a sheet type medium such as printing paper, a check, a banknote or the like. A control method of medium multi-sheet detection according to an embodiment of the present invention will be described below. FIG. 4a is a flowchart of a first method for detecting a remapping of a medium doubling detecting mechanism according to an embodiment of the present invention. The method for detecting doubling includes: Step S102: detecting whether a medium reaches a first position during a medium conveying process Wherein, in the first position, the medium is located between the first pick-up mechanism and the second pick-up mechanism of the pick-up assembly. Preferably, it is possible to detect by the sensor 21 whether the medium has reached the first position. Step S104, when the medium reaches the first position, controlling the first pick-up mechanism and the second pick-up mechanism to perform a relative pick-up motion along the transport direction of the medium. Wherein, controlling the first pick-up mechanism and the second pick-up mechanism to perform the relative pick-up motion in the medium transport direction may include the following: controlling the first pick-up mechanism to perform the pick-up motion in the first direction, and controlling the second pick-up mechanism along the Performing a picking motion in the second direction; or controlling the first picking mechanism to be stationary, and controlling the second picking mechanism to perform the picking motion in the first direction or the second direction; for example, the first mechanism may be controlled by the braking mechanism The paper mechanism is stationary, or the second pick-up mechanism is controlled to be stationary, and the first pick-up mechanism is controlled to perform the pick-up motion in the first direction or the second direction. For example, the second pick-up mechanism can be controlled to be stationary by the brake mechanism. Wherein the first direction is opposite to the second direction. In the embodiment of the present invention, specifically, the first pick-up mechanism may be the driving roller 11 shown in FIG. 3, and correspondingly, the second pick-up mechanism may be the driven roller 12 shown in FIG. 3, and the driving roller 11 rotates. The driven roller 12 can be driven to rotate. However, the first pick-up mechanism and the second pick-up mechanism are not limited to the mechanism shown in FIG. 3. In addition to the case shown in FIG. 3, the first pick-up mechanism and the second pick-up mechanism may also have a powered active roller. Of course, the first pick-up mechanism and the second pick-up mechanism can also be other mechanisms capable of driving the medium. Preferably, when the medium reaches the first position, controlling the first pick-up mechanism and the second pick-up mechanism to perform the relative pick-up motion in the medium transport direction comprises: controlling the first pick-up mechanism to perform the pick-up motion in the second direction, wherein The second pick-up mechanism is configured to perform the pick-up motion only in the first direction; or, the second pick-up mechanism is controlled to perform the pick-up motion in the second direction, wherein the first pick-up mechanism is set to be only along the first The direction performs a crepe movement, wherein the second direction is the opposite direction of the first direction. With the above embodiment, it is possible to easily control the first pickup mechanism and the second pickup mechanism to perform the relative pickup movement in the medium conveying direction. Further preferably, a one-way bearing may be disposed in the pick-up assembly, the one-way bearing being coupled to the first pick-up mechanism or the second pick-up mechanism such that the first pick-up mechanism or the second pick-up mechanism can only follow By performing the squeegee movement in one direction, by providing a one-way bearing, the unidirectional movement of the first crepe paper mechanism or the second crepe paper mechanism can be realized simply and inexpensively without complicated software control or complicated mechanical structure. This embodiment prevents the driven roller from rotating when the paper is ejected by utilizing the characteristic that the one-way bearing can only rotate in one direction, and the overlapping medium between the driving roller and the driven roller is relatively displaced due to the different force, thereby enabling Simple implementation controls the first pick-up mechanism and the second pick-up mechanism to perform a relative pick-up motion in the transport direction of the medium. Step S106, continuing to transport the medium to pass the medium to the second position, wherein the sensor is disposed at the second position. Step S108, detecting whether the medium is re-expanded by using a sensor. Preferably, the sensors in step S106 and step S108 may also be sensors 21, BP, which can simultaneously detect whether the medium is re-expanded and whether the medium reaches the first position by the same sensor. Further, detecting whether the medium is re-expanded by using the sensor may include adopting the following method: the sensor detects whether the medium reaches the second position; After the sensor detects that the medium reaches the second position, detecting whether the output signal of the sensor changes within a first time, wherein the first time is less than or equal to the length of the single medium divided by the conveying speed of the medium; wherein, the output of the sensor In the case where the signal changes in the first time, the medium is re-expanded. In the above embodiment, by setting the squeegee assembly, the squeegee operation is performed on the conveyed medium, so that in the case where the medium is re-stretched, the re-wrapped medium is displaced, and then the medium after the squeegee operation is detected by the sensor. Whether there is a staggered layer to detect whether or not to re-tension, thereby being able to adapt to the multi-sheet detection of a medium of any thickness. Therefore, the multi-sheet detecting mechanism and the detecting method thereof provided by the present invention can be applied to medium detection of an arbitrary thickness, and it is not necessary to adjust the detecting mechanism according to the thickness of the medium, thereby greatly improving the simplicity of the operation of the apparatus. Preferably, in the above method, before the medium is transported in the first direction, the method may further include the step of: detecting whether the medium is present at the entrance of the medium processing device, wherein the medium is transported in the first direction when the medium is present at the inlet. In the following embodiments, the medium multi-sheet detecting method of the present invention will be described in order to detect whether or not the sheet is re-stretched. 4b is a flow chart of a second multi-sheet detecting method of the medium multi-sheet detecting mechanism according to an embodiment of the present invention. The method for detecting the multi-sheet includes: Step S201: transporting the medium along the first direction. The controller controls the driving mechanism 6 to drive the driving roller 11 of the pickup unit 1 to rotate in a set direction, and the driven roller 12 that is tangential thereto is rotated along with the medium between the driving roller 11 and the driven roller 12 In one direction, at this time, the one-way bearing 13 that is sleeved on both ends of the second mandrel 121 of the driven roller 12 rotates in synchronization with the driven roller 12. In step S202, it is determined whether the medium reaches the first position. If yes, step S203 is performed. Otherwise, step S201 is performed to continue to transport the medium in the first direction. The medium moves in the first direction under the driving of the pickup unit 1, and since the sensor 21 is located downstream of the pickup unit 1 in the first direction, when the medium moves between the arc tube 212 of the sensor 21 and the receiving tube 211, The intensity of the light received by the receiving tube 211 of the sensor 21 is reduced. Therefore, by detecting the change of the output signal of the sensor 21, the controller can determine whether the medium covers the surface of the sensor 21, that is, whether the first position is reached, wherein, in the first position. The medium is located between the first pick-up mechanism and the second pick-up mechanism of the pick-up assembly. If the controller determines that the medium reaches the first position, step S203 is performed. Otherwise, the medium does not reach the first position, so step S201 is performed. The pickup assembly 1 continues to transport the media in the first direction. Step S203, conveying the medium in the second direction. When the controller determines that the medium reaches the first position, the control driving mechanism drives the driving roller 11 of the pickup unit 1 to convey the medium in a second direction opposite to the first direction, at this time, due to the tangential cooperation with the driving roller 11 The roller 12 is restricted by the one-way bearing 13 to be rotatable only in the first direction, and therefore cannot be rotated synchronously with the driving roller 11, and is in a stationary state. The medium between the driving roller 11 and the driven roller 12, if it is a single sheet medium, is moved in the second direction by the frictional force of the driving roller 11; if the medium between the driving roller 11 and the driven roller 12 is two Or a plurality of media, the medium in contact with the driving roller 11 is moved in the second direction by the frictional force of the driving roller 11, and the medium in contact with the stationary driven roller 12 is small due to the friction between the media. The displacement is not even displaced, that is, the driving roller 11 and the driven roller 12 perform a relative picking motion in the medium conveying direction, so that the laminated media are relatively displaced from each other, resulting in a staggered layer. While the pickup unit 1 starts to convey the medium in the second direction, the controller starts timing, and when the timing reaches the first predetermined time T1, the controller controls the drive mechanism 6 to stop moving. The first predetermined time T1 is smaller than the distance between the sensor 21 and the driving roller 11 divided by the speed at which the medium is conveyed in the second direction, that is, when the pickup unit 1 stops the paper ejection, the medium is still contained in the driving roller 11 and the driven roller 12 between. Step S204, the medium is again transported in the first direction. The controller controls the driving mechanism 6 to drive the driving roller 11 of the pickup unit 1 to rotate again in the set direction, and conveys the medium in the first direction to drive the driven roller 12 to rotate along with the driving roller 11 and the driven roller 12 The medium moves in the first direction to the second position. Alternatively, the medium may be transported in the second direction, and at this time, a sensor for detecting whether the medium is re-tensioned is further provided downstream of the pickup unit 1 in the second direction. In step S205, it is determined whether the medium is re-expanded. If yes, step S207 is performed, otherwise, step S206 is performed. Since the sensor 21 is located at a second position downstream of the pickup assembly 1 in the first direction, when the medium is conveyed again in the first direction, when the medium between the delivery driving roller 11 and the driven roller 12 passes the second position, Since the medium is located between the light-emitting tube 212 and the receiving tube 211 of the sensor 21, the intensity of the light received by the receiving tube of the sensor 21 is reduced, so that the controller determines that the medium reaches the sensor 21 by detecting a change in the output signal of the sensor 21. At this time, the controller starts timing, as the medium continues to move in the first direction, if the output signal of the sensor 21 remains unchanged during the second predetermined time T2, the controller determines that the transported medium is a single sheet of paper, step S206 is performed; If the output signal of the sensor 21 changes in increment or decrement during the second predetermined time T2, the controller determines that the medium is re-expanded, and then proceeds to step S207. The second predetermined time T2 is equal to the length of the sheet of media divided by the speed at which the medium is conveyed in the first direction. Step S206, outputting a medium. When the controller determines that the medium in the channel is a single sheet of media, the control drive mechanism drives the driving roller 11 of the pickup unit 1 to rotate in the set direction to feed the medium out of the multi-sheet detecting mechanism. Step S207, an alarm. When the controller determines that the media in the channel is re-expanded, the controller alerts the user to process multiple media in the paper path. In this embodiment, the crepe paper assembly is used for both conveying the medium and for causing the stacked media to be displaced relative to each other to produce a staggered layer. Therefore, it is not necessary to separately provide a conveying roller for the movement of the special conveying medium, thereby simplifying the structure and saving the structure. cost. Fig. 5 is a plan view showing the structure of a second embodiment of the medium multi-sheet detecting mechanism provided by the present invention. This embodiment differs from the first embodiment in that the detection assembly 2 further includes a sensor 22. The sensor 22 is disposed on the paper path between the inlet 53 and the pickup unit 1 for detecting the presence or absence of a medium at the inlet 53. The sensor 22 can be a mechanical sensor or a photoelectric sensor. 6 is a flow chart of a second multi-sheet detecting method of the medium detecting mechanism provided in accordance with FIG. 5. Step S302 to step S308 in the method for detecting the re-sequence of the present embodiment are the same as steps S201 to S207 in the method for detecting the multi-sheet, except that step S301 is further included before step S302: step S301, determining whether the entry is There is a medium, and if so, step S302 is performed, otherwise, it is continued to detect whether the medium exists in the entry. The controller determines whether or not the medium is present at the entrance 53 by detecting a change in the output signal of the sensor 22. If the controller determines that the medium exists at the entrance, step S302 is performed, otherwise, it is continued to detect whether the medium exists in the entry. In this embodiment, the sensor 22 is added before the pickup unit 1. Only when the sensor 22 detects the medium, the controller controls the driving mechanism to drive the movement of the pickup unit 1, realizing the automatic feeding function of the multi-sheet detecting mechanism, and further improving the device. The ease of operation. The embodiment of the invention further provides a medium processing device, which comprises the medium multi-sheet detecting device according to any of the above embodiments. The medium processing device according to the present invention may be a media processing device such as a printer, a scanner, or a coin reader. From the above description, it can be seen that the present invention can easily detect whether the medium is re-tensioned. The multi-sheet detecting mechanism and the detecting method thereof provided by the present invention can be applied to medium detection of any thickness, and it is not necessary to adjust the detecting mechanism according to the thickness of the medium. Therefore, the simplicity of the operation of the device is greatly improved. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for detecting a medium multi-sheet, comprising:

Detecting whether the medium reaches a first position during media transport, wherein, in the first position, the medium is located between the first pick-up mechanism and the second pick-up mechanism of the pick-up assembly;

Controlling the first pick-up mechanism and the second pick-up mechanism to perform a relative pick-up motion along a transport direction of the medium when the medium reaches the first position;

Continuing to transport the medium to pass the medium through the second position, wherein a sensor is disposed in the second position;

The sensor is used to detect whether the medium is re-expanded.

2. The medium multi-sheet detecting method according to claim 1, wherein, when the medium reaches the first position, controlling the first pick-up mechanism and the second pick-up mechanism along the The direction in which the media is transported relative to the picking movement includes:

Controlling the first pick-up mechanism to perform a pick-up motion in a first direction, and controlling the second pick-up mechanism to perform a pick-up motion in a second direction; or

Controlling the first pick-up mechanism to be stationary, and controlling the second pick-up mechanism to perform a pick-up motion in the first direction or the second direction; or

Controlling the second pick-up mechanism to be stationary, and controlling the first pick-up mechanism to perform a pick-up motion in the first direction or the second direction,

The first direction is opposite to the second direction.

3. The medium multi-sheet detecting method according to claim 1, wherein when the medium reaches the first position, controlling the first pick-up mechanism and the second pick-up mechanism are along The direction in which the media is transported relative to the picking movement includes:

Controlling the first pick-up mechanism to perform a pick-up motion in a second direction, wherein the second pick-up mechanism is configured to perform a pick-up motion only in the first direction; or

Controlling the second pick-up mechanism to perform a pick-up motion in a second direction, wherein the first pick-up mechanism is configured to perform a pick-up motion only in the first direction,

The second direction is an opposite direction of the first direction.

4. The method according to claim 1, wherein detecting whether the medium is re-expanded by using the sensor comprises:

The sensor detects whether the medium reaches the second position;

After the sensor detects that the medium reaches the second position, detecting whether the output signal of the sensor changes in a first time, wherein the first time is less than or equal to the length of the single sheet of the medium The conveying speed of the medium;

In the event that the output signal of the sensor changes during the first time, the medium is re-expanded.

The method according to claim 4, wherein detecting whether the medium reaches the first location comprises:

The sensor is used to detect whether the medium reaches the first position.

6. The medium multi-sheet detecting method according to claim 1, wherein:

Before the medium is transported, the method further includes:

Detecting the presence of a medium on one side of the pick-up assembly,

Wherein the medium is transported to the first position when the medium is present on one side of the pick-up assembly.

7. A medium multi-sheet detecting device, characterized in that

a conveying mechanism, comprising a crepe paper assembly for conveying a medium, wherein the crepe paper assembly comprises a first crepe paper mechanism and a second crepe paper mechanism;

a first sensor, configured to detect whether the medium reaches a first position during media transport, wherein, in the first position, the medium is located in the first pick-up mechanism and the second pick-up mechanism Between

a controller, configured to, when the medium reaches the first position, control the first pick-up mechanism and the second pick-up mechanism to perform a relative pick-up motion along a transport direction of the medium, and control the A transport mechanism continues to transport the medium to pass the medium through the second position;

The second sensor is disposed at the second location for detecting whether the medium is re-tensioned.

8. The medium multi-sheet detecting apparatus according to claim 7, wherein the controller is further configured to: when the medium reaches the first position: Controlling the first pick-up mechanism and the second pick-up mechanism to perform a pick-up motion in an opposite direction; or

The first direction is opposite to the second direction.

9. The medium multi-sheet detecting device according to claim 7, further comprising:

a one-way bearing coupled to the first pick-up mechanism or the second pick-up mechanism for causing one of the first pick-up mechanism and the second pick-up mechanism to only follow Performing the squeegee movement in the first direction,

Wherein the controller is further configured to control, when the medium reaches the first position, the other of the first pick-up mechanism and the second pick-up mechanism to perform in a second direction Paper movement, wherein the second direction is an opposite direction of the first direction,

10. The medium multi-sheet detecting apparatus according to claim 7, wherein the first sensor and the second sensor are the same sensor.

The medium multi-sheet detecting device according to claim 7, further comprising:

a third sensor disposed on one side of the pick-up assembly for detecting whether a medium is present on one side of the pick-up assembly, and when the medium is present on one side of the pick-up assembly Delivery to the first location.

A medium processing apparatus comprising the medium multi-sheet detecting apparatus according to any one of claims 7 to 11.