KR20010084232A - A sensing apparatus for paper double feeding and paper feeding method using that apparatus for printer - Google Patents

Abstract

PURPOSE: A detecting device for double transfer of sheets and a sheet supplying method thereof are provided to prevent an error in printing while preventing waste of sheets through reporting double transfer of the sheets to a user. CONSTITUTION: A fixed roller(110) and an elevating roller(120) are installed on a sheet supplying passage(160) of transferring sheets(S) toward a printing unit(200). Herein, the fixed roller and the elevating roller are attached to each other. The sheet is transferred by passing between the rollers. The fixed roller is rotated at a fixed state, and the elevating roller receives an elastic force toward an attaching direction to the fixed roller by a spring(130). A sensor(140) is installed on an upper direction of the elevating roller for detecting location of the elevating roller. Therefore, the sensor detects elevated location of the elevating roller in case of not transferring the sheet between the rollers. Moreover, the sensor detects elevated location of the elevating roller in case of transferring one sheet between the rollers and transferring more than two sheets between the rollers. Thus, the sensor transfers a signal to a controller.

Description

A sensing apparatus for paper double feeding and paper feeding method using that apparatus for printer}

The present invention relates to a paper conveying detection device of a printing press that can detect that two or more sheets are fed in a paper feeding process and a paper feeding method using the same.

In general, a printer such as a printer or a copying machine includes a cassette 20 that receives paper S and is coupled to the printer main body 10 as shown in FIG. 1, and is installed on the main body 10 to provide the cassette 20. Pick-up roller 11 for picking up the sheet (S) stored in the sheet by one to enter the paper feed path 13 inside the main body 10 is provided. Therefore, when printing is started, the pickup roller 11 enters the sheet S loaded in the cassette 20 into the printing unit 12 through the paper feed path 13 one by one to perform printing.

By the way, while printing is in progress, the sheets S loaded on the cassette 20 are too stuck to each other so that one or more sheets do not enter the paper feed path 13, and as shown in FIG. Heavy weight may occur. In this case, since several sheets of paper S enter the printing unit 12 at the same time in a state of being slightly displaced from each other, not only the image may not be printed at the correct position, but also the paper in which the image has not been printed is already printed. Since the sheet is heated while passing through (12), there is a problem that the paper loses flatness and curls, making it difficult to use again.

The present invention has been made in view of the above-mentioned point, and detects whether the paper is fed or not feeding the paper feed detection device and the paper feed detection device of the printing machine to prevent a printing error and prevent waste of paper by informing the user The purpose is to provide a method.

1 is a view showing a typical printing press,

2 is a view showing a conventional paper feed path,

3 is a view showing a paper feed path employing the paper conveying detection device of the present invention,

4a to 4c are views for explaining the operation of the paper conveying detection device shown in FIG.

FIG. 5 is a flowchart showing a paper feeding method using the paper conveyance detecting device shown in FIG. 3. FIG.

<Description of Symbols for Major Parts of Drawings>

110 ... fixed roller 120 ... lifted roller

121 Bearing 130 Spring

140 ... Sensor 150 ... Controller

160 ... feed path 200 ... print unit

The paper conveying detection device of the printing press of the present invention for achieving the above object, the fixed roller provided in the paper feed path; A lifting roller which rotates in a state of being elastically in close contact with the paper feed roller by a predetermined elastic means, and is lifted and raised within the elastic range of the elastic means as a gap between the paper feed roller is opened by the paper passing therebetween; A sensor for sensing a lifting position of the lifting roller; And a controller configured to store and process the signal sensed by the sensor as data.

In addition, the feeding method of the printing machine for achieving the above object, the paper feed roller by a fixed roller provided in the paper feed path, the paper is rotated in a state of being in close contact with the paper feed roller by a predetermined elastic means and passed therebetween. Preparing a lifting roller which is lifted within the elastic range of the elastic means, the sensor for detecting the lifting position of the lifting roller, and the controller for storing and processing the signal detected by the sensor as data as the gap between Steps; A reference value storing step of passing a sheet of paper between the fixed roller and the lifting roller, and storing position information of the lifting roller detected by the sensor as a reference value in the controller; Reading position information of the lifting roller detected by the sensor as a measured value while passing the paper between the fixed roller and the lifting roller during actual printing; Comparing the measured value with the reference value at the controller; When the difference between the measured value and the reference value is equal to or greater than a set error range, stopping feeding and displaying an error message informing the user of feeding the paper; And completing the feeding normally when the difference between the measured value and the reference value is within a set error range.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 shows a paper conveying detection device according to the present invention.

Referring to the drawings, the fixed roller 110 and the lifting roller 120 are installed to rotate in close contact with the paper feed path 160 to which the paper S is conveyed toward the printing unit 200. Therefore, the paper S passes through these two rollers 110 and 120. And the fixed roller 110 is rotated in a fixed state, but the lifting roller 120 is receiving elasticity in the direction in close contact with the fixed roller 110 by a spring 130 which is an elastic means, the elasticity It can go up and down a predetermined interval within the range. Reference numeral 121 denotes a bearing of the lifting roller 120. In addition, above the lifting roller 120, a sensor 140 for detecting the position of the lifting roller 120 is installed. This sensor 140 is used when the paper S is not passed between the two rollers 110 and 120 as shown in FIG. 4A, and when a sheet of paper S is passed as shown in FIG. 4B, and FIG. As 2c or more sheets (S) is passed as shown in 4c it is detected that the lifting position of the lifting roller 120 is different, respectively, and sends a corresponding signal to the controller 150.

The paper feeding operation using the paper feeding sensor of the above configuration proceeds as described in the flowchart of FIG. 5. First, a paper conveyance detecting device such as the fixed roller 110, the lifting roller 120, the spring 130, the sensor 140, and the like is prepared on the paper feed path (S1), and the fixed roller (as shown in FIG. 4B). One sheet of paper S is passed between the roller 110 and the lifting roller 120. At this time, the sensor 140 detects the lifted position of the lifting roller 120 when one sheet of paper S passes and transmits the signal to the controller 150, and the value according to the signal is controller 150. ) Is stored as a reference value (S2). In other words, this state is set so as to recognize the normal state in which only one sheet of paper S passes. After the actual printing proceeds while the paper (S) passes between the fixed roller 110 and the lifting roller 120, the lifting roller 120 is lifted and measured by the sensor 140 (S3), The measured value is compared with the reference value (S4). In this case, if the lifting position of the lifting roller 120 shows an amount of change of 80% or more with respect to the reference value, that is, if the lifting roller 120 is measured to be 80% higher than the reference value, the controller 150 may measure this. The printer stops feeding and recognizes an error message to the user, and displays an error message to the user (S5). Therefore, the user may remove the conveyed paper S from the printing press and proceed with printing again. On the other hand, if it is determined that the difference between the reference value and the measured value within 80% in step S4, the controller 150 regards this as a normal state and completes the feeding normally (S6).

In this way, by sensing and coping with whether one sheet or two or more sheets pass through the paper feed path, it is possible to prevent the multi-feed printing.

Meanwhile, in the present exemplary embodiment, the error range between the reference value and the measured value is set to 80%. However, the error range of the reference value and the measured value is set to 80%. However, the error range is not necessarily set to 80%. You can adjust it more sensitively or more slowly.

As described above, since the paper conveying detection device according to the present invention detects whether the paper conveyed to the printing unit is conveyed and prevents a printing error, the paper feeding method using the same prevents unnecessary paper waste.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (3)

A fixed roller installed in a paper feed path; A lifting roller which rotates in a state of being elastically in close contact with the paper feed roller by a predetermined elastic means, and is lifted and raised within the elastic range of the elastic means as a gap between the paper feed roller is opened by the paper passing therebetween; A sensor for sensing a lifting position of the lifting roller; And, And a controller for storing and processing the signal detected by the sensor as data. Elastic range of the elastic means as the gap between the fixed roller provided in the paper feed path and the paper feed roller is rotated in a state of being elastically in close contact with the paper feed roller by a predetermined elastic means and the paper passed therebetween opens. Preparing a lifting roller which is lifted in and out, a sensor for sensing a lifting position of the lifting roller, and a controller for storing and processing the signal detected by the sensor as data; A reference value storing step of passing a sheet of paper between the fixed roller and the lifting roller, and storing position information of the lifting roller detected by the sensor as a reference value in the controller; Reading position information of the lifting roller detected by the sensor as a measured value while passing the paper between the fixed roller and the lifting roller during actual printing; Comparing the measured value with the reference value at the controller; When the difference between the measured value and the reference value is equal to or larger than a set error range, stopping feeding and displaying an error message informing the user of feeding the paper; And discharging normally when the difference between the measured value and the reference value is within a set error range. The method of claim 2, And the error range is set such that the measured value exceeds 80% or more of the reference value.