JPS582895B2 - Paper overlap detection device - Google Patents

Description

[Detailed Description of the Invention] The present invention mechanically or optically detects the thickness of paper to detect that two or more sheets of paper are being fed in an overlapping manner (hereinafter simply referred to as overlapping feeding). Regarding equipment.

Currently, overlapping paper feed is set by detecting the amount of transmitted light of the paper, converting it into an electrical signal, and comparing it with a set value, or converting the thickness of the paper into mechanical displacement, and then directly turning a switch on and off. Detection is performed by comparing the mechanical displacement with a set value or by converting the mechanical displacement into an electrical signal and comparing it with a set value.

However, most conventional devices use the same setting values to compare paper sheets of different thicknesses, so for example, in devices that detect the amount of transmitted light, there are restrictions on paper color, material, and where to write print data. , even if other conditions are the same, there is a drawback that two sheets of paper with thickness t and one sheet of paper with thickness There was a drawback that it was not possible to distinguish between a single sheet of paper weighing 2 tons.

For this reason, there was a drawback that many types of paper with different thicknesses and colors could not be used.

On the other hand, in other conventional devices, the operator increases or decreases the set value by changing the sensitivity of the sensor depending on the type of paper, but this increases the work required by the operator and
There was a drawback that malfunctions could occur due to operational errors.

In order to eliminate the above-mentioned drawbacks, the present invention provides a reader that reads thickness information indicating the thickness of the paper from a sheet of paper, and a decoder that decodes the thickness information read by the reader and outputs a corresponding designated signal. , a setting device that sets different judgment conditions according to the specified signal, a thickness detector that detects the thickness of the paper, and an output of the thickness detector that conforms to the judgment condition set in the setting device. The present invention provides an overlapping feed detection device comprising a determiner that determines overlapping feeding when the above-mentioned operation occurs, and will be described in detail below with reference to the drawings.

FIG. 1 is a schematic side view showing an embodiment according to the present invention, FIG. 2 is a plan view showing a sheet used in the embodiment shown in FIG. 1, and FIG.
Figures A, C and C are operation explanatory diagrams showing the operation of the embodiment shown in Fig. 1. The thick paper is 2.
Figure 4 shows when there are more than 1 sheet of paper or several thin sheets of paper.
FIG. 3 is a diagram showing a truth table showing determination conditions for the implementation shown in the figure.

In FIGS. 1, 2, and 3, 1 is a sheet of paper on which thickness information 1a indicating the thickness is recorded, 2 is a reader for reading the thickness information recorded on the sheet 1, and 3 is the reader. a decoder that decodes the thickness information read by the decoder 2 and outputs a corresponding designated signal; a setter 4 that sets different judgment conditions according to the designated signal output from the decoder 3;
1 is a detection roller that detects the thickness of the paper 1 and converts it into mechanical displacement; 6 is a feeding drum that sends the paper 1 to the detection roller 5; 7 is a feeding drum that rotates about a shaft 7a; 8 is a lever that magnifies the mechanical displacement of the detection roller 5; 9 is a spring that biases the lever 7 clockwise; 10;
When the lever 7 does not rotate, the light emitting elements a and 10b are all blocked by the lever 7 and output a "0" signal, and as the lever 7 rotates, they sequentially receive light from the light emitting elements 11a and 11b. The first and second light-receiving elements 12 that output a "1" signal output a "0" signal or a "1" signal output from the first light-receiving element 10a and the second light-receiving element 10b, respectively. This is a determining device that receives the paper thickness signal as a signal and outputs an overlapping feed signal when this paper thickness signal conforms to the determination condition set in the setting device 4.

The operation in the above configuration will be explained.

First, when the paper 1 is fed by the drum 6, the reader 2 reads the thickness information recorded on the paper 1, and the decoder 3 decodes this thickness information and outputs a corresponding designation signal.

The setting device 4 sets different judgment conditions according to this designation signal, for example, as shown in FIG. 4.

Next, when the paper 1 is inserted between the detection roller 5 and the drum 6, the detection roller 5 moves according to the thickness of the paper and converts the thickness of the paper 1 into mechanical displacement.

Due to this mechanical displacement, the lever 7 rotates around the shaft 7a against the biasing force of the spring 9 as shown in Figure 3 and C, so that the first light receiving element The light receiving element 10a and the second light receiving element 10b receive light from the corresponding light emitting elements 11a and 11b, respectively, and sequentially output signals from "0" to "1".

If the output signals from the first light receiving element 10a and the second light receiving element 10b are S1 and S2, respectively, the determiner 1
2 outputs the output signal OUT shown in FIG. 4 based on the output signals S1 and S2 and the above-mentioned determination conditions, so that overlapping feed can be automatically determined.

In other words, in the case of two thin sheets of paper, the output signal OUT becomes a "1" signal when the first light receiving element 10a receives the light, as shown in the opening in Figure 3, and it is determined that overlapping feeding has occurred, but in the case of two thick sheets of paper, As shown in FIG. 3C, the output signal OUT will not become a "1" signal unless at least the second light receiving element 10b receives light. Therefore, even if one sheet of thick paper is in the third slot state, overlapping feeding will occur. Don't judge.

Note that under normal conditions, the first light receiving element 10a always receives light before the second light receiving element 10b receives light, so in this embodiment, the case where a "1" signal is output only from the second light receiving element 10b is considered to be a failure and the output signal OUT is output. Although a "1" signal is output, it is of course possible to output a "0" signal as well.

Further, in the above embodiment, the thickness information 1a recorded on the paper 1 is not limited to information that can be read optically, such as handwritten characters, printed characters, bar codes, marks, and perforations, but may also be magnetic patterns. The reading element of the reader 2 and the decoding method of the decoder 4 must be selected depending on the recording format of the thickness information 1a.

In addition, if paper 1 has various input data recorded in the form of characters, barcodes, marks, etc., and is equipped with a reader to read this manual data, the same recording format can be used with one reader 2. It is desirable to read the thickness information and input data.

Further, the setter 4 may be a flip-flop circuit that stores judgment conditions corresponding to the thickness information 1a, and the judger 12 may be formed from a simple gate circuit.

Note that the present invention is not limited to the above-mentioned embodiments; for example, an optical sensor detects the amount of transmitted light of the paper, and when the amount of transmitted light matches a determination level set in a setting device, it is determined that overlapping feeding is occurring and an overlapping feeding signal is sent. It may also be output.

Note that since the determination condition at this time is a specific level, it goes without saying that a determiner that can compare analog voltages and determine the magnitude relationship is used.

Furthermore, the number of judgment conditions is not limited to two types, and can be increased depending on the type of paper used. Of course, design changes may be made, such as increasing the types of designated signals output from the decoder.

As described in detail above, according to the present invention, it is possible to automatically detect overlapping feeding of a plurality of types of sheets having different thicknesses.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment according to the present invention, FIG. 2 is a plan view showing a sheet used in the embodiment shown in FIG. 1, and FIG.
Figures A, C, and C are operation explanatory diagrams showing the operation of the embodiment shown in Fig. 1, and Fig. 4 is a diagram showing a truth table showing determination conditions of the embodiment shown in Fig. 1. 1...Paper, 1a...Thickness information, 2...Reader, 3...
Decoder, 4... Setting device, 5... Detection roller, 6... Feeding drum, 7... Lever, 8... Limiter, 9... Spring, 10a and 10b... Light receiving element, 11a and 11b... Light emitting element, 12...determiner.

Claims (1)

[Claims] 1. A feeding means for feeding paper on which information indicating the thickness of the paper is written in advance, a decoding means for reading and decoding the information written on the paper, and outputting a thickness signal, A sheet overlapping feed detection device comprising: a thickness detecting means for detecting the thickness of the sheet and outputting a detection signal; and a determining means for detecting overlapping sheet feeding by the decoding means and the thickness detecting means. .