SU1425739A1 - Device for detecting clinging sheets of moving documents - Google Patents

Abstract

The invention is i-nos to automatics and computing, namely to devices for detecting adhered sheets of moving documents. The purpose of the invention is to expand the field of application of the device by eliminating the dependence of its configuration on the optical properties of documents. The goal is achieved by the fact that the device containing the first 1 and second 2 light sources, the first 3 and second A photovoltaic cells and the first element And 13, introduced operational amplifier 9, the delay element 10, the key 11, the inverter 12 and the second element And 14. 1 Il.

Description

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The invention relates to automation and computing, namely to devices for detecting adherent sheets of moving documents.

The purpose of the invention is to expand the field of application of the device by eliminating the dependence of its configuration on the optical properties of documents. tO

The drawing shows a functional block diagram of an apparatus for detecting stuck sheets of moving documents.

The device contains the first 1 and 15 second 2 light sources, the first 3 and second 4 photoelectric converters, including the first 5 and second 6 resistors, respectively, as well as the first 7 and second 8 photoceremii-20 ki, operational force: gel 9, element 10 delay, key P, inverter 12, first 3 and second 14 elements I.

. The device works as follows .25

Sources 1 and 2 of the light and the corresponding photoelectric converters 3 and 4 are located along the movement of the sheets of 15 documents. In the initial state, in the absence of a document sheet, radiation flows freely from sources 1 and 2 of light to photoreceivers 7 and 8, while the resistors 5 and b are chosen so that the outputs of the dividers consisting of , g of the resistor 5 and the photodetector 7, as well as from the resistor 6% of the photoreceiver 8, there are zero levels corresponding to logical O, and the level at the output of the photoelectric converter Q 3 (inverting input of the operational amplifier 9) in the initial state is chosen slightly higher than photovoltaic output eskogo transducer 4 (the non-inverting input of operational amplifier 45 9). In such a case, at the output of the operational amplifier 9, operating as a comparator, there is a negative level, which is fed to the input of the key Q P (the transistor of the key 11 is closed) and at the output of the key. - high level, corresponding to logical 1, This level is fed to the input of the inverter 12 “At the output of the last and second input of the first element And 13 there is a logical one. At the first input of the element And 13 is also a logical O, at the output of the element And 13

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There is a low level of logic O on the device,

When the first document is fed into the working area, the radiation flow from the source I of the light to the photovoltaic converter 3 first overlaps. The signal at the output of the operational amplifier 9 is negative because the signal at the inverting input of the operational amplifier 9 is larger than at the noninverting input. The document then blocks the radiation flux from the source 2 of the light to the photoelectric converter 4. Now with simultaneous overlapping of the fluxes of radiation from the two light sources, the signals at the inputs of the operational amplifier 9 are approximately the same. At the same time, the signal at the output of the operational amplifier 9 remains below the zero level or equal to the zero level. The transistor key 1 I remains closed and at the output of the inverter 12 there is a logic level O arriving at the second input of the first element AND 13. And at the first input of the element I 13 is a logic level 1 coming from the photoelectric converter 3. At the output of the device (the output of the element I 3) get a logical level of zero.

Upon further movement of the first sheet of the document, the radiation flux from the light source 2 still remains blocked. Between the light source 1 and the photovoltaic converter 3 there is a gap between the first and second sheets of the document. In this case, at the non-inverting input of the operational amplifier 9, the signal level is higher than at the input input. At the output of the operational amplifier 9, a positive alarm level is generated. The transistor key 11 opens and at the output of the inverter 12 (the second input of the first element And 13 has a level of logical I. But at the first, the input of the element And 3 level of logic O, coming from the photoelectric converter 3, is earlier at the switching time delay in series an operational amplifier 9, a key II and an inverter 12. Therefore, at the output of the device (output element And 13), the signal level remains low, corresponding to the level of logic O,

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the occurrence of a false alarm level 1 at the output of the device when there is a gap between the source I of the light and the photoelectric npe-i 3 there are spaces between the sheets of the document during their movement, does not occur.

Consider the case of getting the first sheet of a document into the work area of two or more sheets of a document. While there is one sheet of the document in the zone of the light source 2, and two sticky sheets of the document are in the zone of the light source 1, there is a detectable level at the output of the operational amplifier 9. At the output of the device - the signal is zero. As soon as two or more document sheets are stuck in the zone of action of the light source 2, and in the area of the light source 1, one sheet follows the two, the signal at the non-inverting input of the operational amplifier 9 becomes larger than at the inverting input. The signal at the output of operational amplifier 9 becomes positive. The transistor key 1 I opens and at the second input of the first element And 13 appears. Logical level 1. At the first input of element 13 also appears the level of logical I, coming from the photoelectric converter 3, delayed by the delay element 10 and the second element And 14 at the response time of the series-connected operational amplifier 9, key 11 and investor 12. Thus, at the output of the first element I 13 (device output), an alarm level 1 signal appears, indicating that two or more sticky sheets.

Thus, the introduction to the known device operational effort

l, a key, an inverter, a delay element, and a second element And allows you to expand the scope of application of the device by eliminating the dependence of its settings on the optical properties of documents.

Claims (1)

Formula invention A device for detecting adhering sheets of moving documents, comprising first and second light sources, first and second photoelectric converters optically coupled to the first and second light sources, respectively, located along the movement of the documents, and the first And element, characterized in that expanding the field of application of the device by eliminating the dependence of its configuration on the optical properties of documents, it contains an operational amplifier, the inverting input of which is connected to the output of the first fotoelekrichesko- r6 th transducer, and neinvertiruto- conductive input connected to the output of the second. photoelectric converter, the delay element, the input of which is connected to the output of the first photoelectric converter, the second element And, the first input of which is connected to the output of the first photoelectric converter, the second input connected to the output of the delay element, and the output connected to the first input of the first element And, key, input which is connected to the upper side of the operational amplifier, and the inverter, whose input is connected to the output of the key, and the output is connected to the second input of the first element And, the output of which is the output home device.