TWI329612B - Sheet-conveying apparatus and method for detection of multiple documents thereof - Google Patents

Description

1329612

= 达达号: TW3490PA IX. Description of the Invention: [Technical Field] The present invention relates to a paper feeding device, and Iθ - a paper feeding device capable of making multiple sheets and (4) 】 Most of today's scanners, photocopiers, or multifunction printers are used to feed the entire stack of products into the electronic device to perform scanning, photocopying, or printing, etc. The sheet feeding device has been able to feed the entire stack of documents or papers to and from the electronic device, but the employment of the company still reduces the situation of the paper. If you scan two or more documents at the same time, you will scan the (four) text (4) volume and the guide material will not be complete. If a plurality of documents are fed at the same time during photocopying, the problem of paper jam is very likely to occur and the electronic device is interrupted.刖 侦测 Detecting multiple feeds When the document passes through the paper feed path, it touches the document with a touch or sensing arm and measures the amount of change in thickness. When the thickness change amount exceeds a predetermined range, it is determined that a plurality of sheets are fed. However, this detection method is not only low in sensitivity, slow in sensing speed, but also easily causes a paper jam problem. SUMMARY OF THE INVENTION The present invention relates to a paper feeding device for detecting multiple sheets of paper feeding and a method for detecting the same, which are provided with a plurality of groups of emitters and 6 in a paper feeding device.

13 2 of 12 $M: TW3490PA Receive: and tilt at least one of the transmitters and receivers to enhance the detection. The invention provides a Wei-Board feeding device, which comprises a paper feeding mechanism and a paper-feeding device. The paper feed path is used to move the paper along/forward. The paper feeding mechanism is used to convey the paper through the paper feed. 2. The detection device includes the first transmitter, the first receiver, the second transmitter, and the second transmitter. The transmitter-transmitter is configured to transmit a first signal, its -second::, a transmission path, and is received by the first receiver. The first line: the second signal is transmitted by using the second signal, and the second signal is received along the second transmitting first receiver. Wherein, the second transmission path is not in the first transmission path. · Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π Π 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测 侦测Then, the second ==: the signal transmission variation of the second transmission path of the transmission path determines whether the multiple transmissions are reduced, and the first information is different. The preferred embodiment is described in detail with reference to the accompanying drawings, and is described in detail as follows: [Embodiment] A paper feeding device and a method for making a plurality of paper feedings are proposed by the paper feeding device. Side 7 1329612

· Sanda number: TW3490PA Whether or not two or more sheets of paper are fed into the paper feeding device at the same time during the paper feeding process. Referring to Figure 1, there is shown a schematic view of a paper feeding device in accordance with a preferred embodiment of the invention. As shown in Fig. 1, the paper feeding device 1 includes a paper feeding mechanism (not shown), a paper feed path 10, and a paper detecting device. The paper feed path 10 is for moving the paper along/the conveying path, and the paper feeding mechanism is for conveying the paper through the paper feed path 1〇. The paper detecting device includes a first transmitter 12, a first receiver 14, a second *transmitter 16, a first receiver 18 and a control unit 20. The first transmitter and the first receiver 14 are disposed on opposite sides of the paper feed path 10, wherein the signal of the first transmitter 12 travels along the first transmission path P1 and is received by the first receiver 14. The signals from the second transmitter 16 and the second receiver 18 disposed on the other two sides of the paper feed path 10, the second transmitter 16, are carried along the second transmission path P2 and are received by the second receiver 18. The second transmission path 1 > 2 is non-parallel to the first transmission path P1. Φ Preferably, the transmitter and receiver are arranged such that the transmission path of a transmitter and a receiver is perpendicular to the transport path of the paper. In the present embodiment, the first transmitting path 12 of the first transmitter 12 and the first receiver 14 is perpendicular to the transport path of the sheets 100, 200. And the second transmitter 16 and the second receiver 18 are disposed obliquely on the paper feed path 1〇 to make the second transmission path P2 and the first transmission path? 1 has an angle between them. The first transmitter 12 and the second transmitter 16 are two ultrasonic waves, and the first receiver 14 and the second receiver 18 are two ultrasonic receivers. Ultrasonic wave transmitted by the first transmitter 12 and the second transmitter 16 13 1329612

' ' Sanda number: TW3490PA number is received by the first receiver 14 and the second receiver 18 after penetrating the paper. The penetration of the ultrasonic wave is related to the material properties of the material being penetrated, so that it is possible to determine whether or not multiple sheets are fed by measuring the amount of change in the signal after the ultrasonic wave penetrates the substance. In addition, since the energy attenuation of the ultrasonic waves is changed by the thickness of the penetrating substance, ultrasonic waves can be used to detect different paper types in a specific weight range. However, the interface of the paper overlap causes the phase of the ultrasonic wave to change, so the ultrasonic wave can be used to detect whether there is more than one paper feed. The paper feeding mechanism of the paper feeding device 1 feeds the sheets one by one into the paper feed path 10. However, as shown in FIG. 1, when the sheet 100 and the sheet 200 are simultaneously fed into the sheet feeding path 10, by the first emitter 12, the first receiver 14, the second emitter 16, and the second receiver 18 and the operation of the control unit 20, it is possible to detect a plurality of sheet feeding conditions of the sheet feeding device 1. The following figures illustrate two different detection methods. Referring first to Figure 2, there is shown a first flow chart of the method of detecting multiple sheets in the paper feeding device of Figure 1. Please refer to the figures 3A to 3B, which are schematic diagrams of the paper feeding device of Fig. 1 when it is detected. As shown in FIG. 2, the method for detecting a plurality of sheets by the sheet feeding device 1 includes steps 21 to 23: first, the first emitter 12 is caused to emit the first signal, and the second emitter 16 is caused to emit the second signal. The second signal travels along a second transmission path P2 that is not parallel to the first transmission path P1; then, the first transmitter 12 and the second transmitter 16 are received by the first receiver 14 and the second receiver 18, respectively. The signal is transmitted to the control unit 20; then, the control unit 20 changes according to the signal change amount of the first signal and the signal of the second signal 9 1329612

• 'Three-sided number: TW3490PA amount to determine if multiple feeds have occurred. In step 22, when the paper is fed into the paper feed adapter 1, the drive circuit (not shown) inside the control unit τ 20 will drive the transmitter 12 and the second transmitter 16 to transmit at the same frequency or different frequency. Wave signal (number - signal and signal: signal). In this embodiment, the frequency of the two signals is the same as the frequency of the second signal. As shown in Figure 3A,

The first signal transmitted by the first emitter 11 12 only penetrates the paper 100, and the second signal emitted by the second emitter 16 penetrates the paper. The 'second signal' will be phased due to the interface between the paper 1〇〇 and the 2〇〇 paper, so although the first % rides you, you cry the flute 1 唬 and the frequency of the number is the same as the first... There is a difference in the signals received by a receiver. Also, the skewed anisotropy of the first-emission H 16 and the second purer 18 is more pronounced. Eight: The second receiver 18 will transmit the received signal knife No. 3 and fourth signal ' to the control unit 20. The signal calculation number and the first phase of the celestial flute--% phase shift must be 1, and are judged by the fourth signal and the unit 20; the phase of the leaf signal is just 2. The control judges whether or not the readout can be different from the phase shift amount ” ′ ^ ^ to further determine whether or not a plurality of sheets of paper are simultaneously fed to the sheet feeding device 4.] 疋 疋 替 ί ί 发射 发射 发射 发射 发射 发射 发射 发射 发射 发射The second shot (four) 16 shots of the penetration of the paper 100 and 200, because the standing, the penetration rate and the penetrating substance due to the penetration of the super S wave Feng 1 spring, can be judged by the penetration rate of the signal 1329612

Sanda number: TW3490PA As shown in Figure 3B, the air gap between sheets 100 and 200 is D1. Since the first transmission path P1 is perpendicular to the transport path of the paper, the ultrasonic transmittance of the first emitter 12 is related to D1, and the super-wavelength transmittance of the second emitter is D2 (D2=D1). /cos0) related. Thus, the third signal and the fourth signal received by the control unit 20 by the first receiver and the second receiver 18 are inevitably due to the effect of the ultrasonic wave being similar to the absorbed effect' with the first signal and the second signal. The lower side has the attenuation amount and (5 2. Since the second transmitter 16 and the second receiver a are tilted), the attenuation amount occupies 1 and 2 to make a difference. The multi-feed condition causes the paper to be placed. The presence of the air gap causes the ultrasonic wave to be attenuated, and the second transmitter 16 and the second receiver 18 are tilted to make the difference between the attenuation amount of the first signal and the attenuation amount of the second signal 2, and the control unit 20 Therefore, it is possible to effectively detect multiple sheets of paper feeding. Although the above method uses the ultrasonic signal with the same transmitting frequency for detection, it can be detected by the super-luo signal with different transmitting frequencies. And because the higher frequency ultrasonic signal hits the same sheet of paper of the same thickness, the degree of attenuation is higher. In other words, the higher the frequency, the sharper the ultrasonic wave is for sharp or thin paper, so the ultrasonic signal can be adjusted. Frequency to improve the acuity of detection. Please refer to Fig. 4, which shows a second flow chart of the method for detecting multiple sheets in the paper feeding device of Fig. 1. As shown in Fig. 4, the paper feeding device 1 detects Another method of measuring a plurality of sheets includes steps 41 to 43: first, causing the first transmitter 12 to transmit the first signal ' along the first transmission path P1 at a first time and receive the signal from the first receiver 14, and then The signal is transmitted to the control unit 1329612, the three-number: TW34卯PA 2〇; then, the second transmitter 16 is caused to emit the second signal along the second transmission path P2 that is not parallel to the first transmission path P1 at the second time, and is The second receiver 18 receives the signal and transmits the signal to the control unit 20; then, the control unit 20 determines whether a plurality of paper feeds have occurred according to the signal change amount of the first signal and the signal change amount of the second signal.

The difference from the method of steps 21 to 23 is that the first transmitter 12 and the second transmitter 16 transmit ultrasonic signals at different times, but they measure the signal variation of the first signal and the second signal (such as phase change). There is no difference between the method of attenuation and the method of attenuation. Therefore, it is also effective to detect whether multiple sheets are fed. Although this embodiment only uses two sets of transmitters and receivers for description, in fact, more than two sets of transmitters and receivers can be used for detection, as long as at least one set of transmitters and receivers are tilted. And when the weight of the paper on the paper feed path 10 is 50 gsm (gram per square (7) to 120 gsm', the signal frequency transmitted by the first transmitter 12 and the second transmitter 16 is greater than 40 kHz' or preferably From 200 kHz to kilohertz, it has been very good at the time of detection. J horse uses...in the field, the printer or the multi-tasking, in the electronic device, to scan the manuscript or blank photo: I If the paper feeds 12 sheets of paper into the electronic device, it is expected that the paper is too thick to cause phase problems, which interrupts the operation of the electronic device. After measuring multiple sheets of paper, the treatment is free. 12 1329612

' _ Sanda number: TW3490PA (1) The electronic device will stop working, directly output overlapping paper to the paper exit tray, and display multiple feeds on the control panel or screen of the electronic device. (2) The electronic device (such as the scanner) will continue to operate, but only the file on the top layer and close to the image capture area will be scanned. After scanning, multiple sheets will be displayed on the control panel or screen. Message. The paper feeding device disclosed in the above embodiments of the present invention and the method for detecting multiple sheets are provided with two or more sets of ultrasonic transmitters and receivers in the paper feeding device, wherein at least one of the emitters The position with the receiver is inclined with respect to the paper surface of the paper being conveyed. These ultrasonic transmitters can transmit signals of the same or different frequencies and can transmit signals at the same time or at different times. The ultrasonic transmitter and receiver are used in conjunction with the tilt to detect whether the paper overlaps, so that the detection effect is improved. In conclusion, the present invention has been disclosed above in a preferred embodiment, and is not intended to limit the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. 13 1329612

', Sanda Number: TW3490PA BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a paper feeding device in accordance with a preferred embodiment of the present invention. Fig. 2 is a first flow chart showing the method of detecting a plurality of sheets in the sheet feeding device of Fig. 1. 3A to 3B are schematic views showing the paper feeding device of Fig. 1 at the time of detection. Fig. 4 is a second flow chart showing the method of detecting a plurality of paper feeds by the paper feeding device of Fig. 1. [Main component symbol description] 1 : Paper feeding device 10 : paper feed path 12 : first transmitter 14 : first receiver 16 : second transmitter 18 : second receiver 20 : control unit 100, 200 : paper P1 : first transmission path P2: second transmission path

Claims (1)

1329612 : TW3490PA Patent Application Range: 1. A paper feeding device comprising: a paper feed path, using -e paper secret field to make a paper along a 1-way road transaction; a paper feeding mechanism 'for conveying the paper through a channel detecting device disposed in the paper feed path, the paper detecting signal, the first first transmitter for transmitting the ~ signal system to travel along a first transmitting path; , the device is configured to receive the first signal; the signal is traveling along the second transmission path; and the first signal is in the first 1; the second receiver is configured to receive the second signal; The second transmission path is not parallel to the second, as described in the first item of the patent application scope. The first-transmitting path is perpendicular to the transmission path. , ❻I set '3. As in the paper feeding error mentioned in the first paragraph of the patent application, the first-transmitter and the second transmitter are simultaneously, 'set' respectively to emit the first signal and the first Second signal. 5 Simultaneous 4. In the paper feed described in claim 1 of the patent application, the first transmitter and the second transmitter emit the same or different signals. The phase of the paper feeding device as described in claim 1 is that when the weight of the paper is from 50 g/m 2 to 120 g/m 2 , at least the one of the device and the second emitter The signal frequency of the transmission ^ ^ kilohertz. 1糸 is greater than 40 15: TW3490PA 0. Paper as stated in Shen 5»Patent_ Item 0 = Less The first-transmitter and the second transmitter _ transmitter hair signal frequency is bounded by Qi Qiancheng 7. The paper feeding device of claim j, wherein the first emitter and the second emitter are two ultrasonic emitters J. 'the first receiver and the first The two receivers are the two paper feeding devices of the ultrasonic wave receiving application, and the side device further includes a judging unit electrically connected to the first receiver and the second receiving Hx. The first received by the first receiver and the second change received by the second connector determine whether multiple sheets are fed. 9. As stated in item 1 of the application a paper feeding device, wherein the first shot and the first receiver, and the second transmitter and the first receiver 'at least one of the group of transmitters and receivers are respectively disposed on both sides of the paper feed path 10. A method for detecting multiple sheets of paper, comprising: transmitting a first signal using the first transmitter The first signal travels along a first transmission path; a second transmitter is used to transmit a second signal, and the second signal travels along a second transmission path that is not focused on the first transmission path; - receiving, by the first receiver, the first signal; receiving the second signal by using the second receiver; and determining whether multiple sheets are fed according to the respective signal changes of the first signal and the second signal" 1329612 Edit or · TW349〇Pa u, as described in the patent application scope 1Q, the change of the exchange number is the attenuation of the signal amplitude." The information I2 · as described in the scope of claim 10, The number of changes is the offset of the signal phase. The method of claim 1, wherein the device and the second transmitter transmit the first signal and the second signal at the same time or at different times. 14. The method of claim 1, wherein the first transmitter and the second transmitter transmit the same signal frequency. 15. The method of claim 1, wherein when the weight of the paper is 5 〇g/m2 to i20g/m2 'at least the first emitter and one of the second emitters emit The signal frequency is greater than ^ kHz Hz Y 16. The method of claim 15 wherein at least the first transmission n and the second transmitter are transmitted by the transmitter; the signal frequency is bounded by 200 Between kilohertz and 300 kHz. 17. The method of claim 10, wherein the first transmitter and the second transmitter are two ultrasonic transmitters, and the first receiver and the second receiver are two Ultrasonic receiver. 18. The method of claim 1, wherein the paper detecting device further comprises a determining unit electrically connected to the first picker and the second receiver for receiving according to the first Whether the first signal received by the device and the second signal received by the second receiver respectively change the amount of signal to determine whether multiple sheets are fed. 17