JPH05213480A - Paper sheet conveyor - Google Patents

Abstract

PURPOSE:To accurately detect the timing of passage and the length of each paper sheet and the interval to the next one in conveying transparent paper sheets. CONSTITUTION:A pair of opposite conveyor belts 20 convey paper sheets 10 such as postal matter in a direction C of carriage. An ultrasonic sound emitter 30 and an ultrasonic sound receiver 40 constantly transmit and receive ultrasonic waves to and from each other and this transmission line is blocked by the paper sheets 10. When the paper sheets 10 are made of transparent members, transmission of the ultrasonic waves is blocked by the paper sheets 10, which is different from the case with a photoelectric switch. A converting portion 50 detects the timing at which transmission is blocked and converts this detection information into an electric signal and sends it to a control portion 60. The control portion 60 produces outputs required to control the conveying of the paper sheets, such as the timing of passage and the length of each paper sheet 10 and the interval to the next one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus, and in particular, for conveying a sheet on a conveying path formed by a pair of opposed conveying belts such as rotating conveyors, which is sandwiched by the conveying belts for sorting, sorting and the like. , A paper sheet conveying device for conveying paper sheets such as mail.

[0002]

2. Description of the Related Art For example, in a transporting device for transporting paper sheets along a transport path formed by a transport belt, which corresponds to a transport purpose such as sorting of whether or not a mail is a fixed size, collection of destinations, etc. In order to carry out the conveyance purpose, it is necessary to detect the passage timing, length, and the interval between two succeeding paper sheets on the conveyance path. Conventionally, a photoelectric switch is used for this detection. It had been.

This photoelectric switch is composed of a combination of a pair of a light emitting element and a light receiving element. Both elements are arranged to face each other on both sides of a conveying path to determine whether or not a paper sheet moving in an optical path between the elements is blocked. Grasping the condition, the timing of paper sheet passage,
The length and the distance between two successive sheets were detected.

[0004]

Since the above-mentioned conventional optical switch has a method of detecting the state of blocking the optical path, in the case of paper sheets made of a transparent polymer member or the like, The light from the photoelectric switch passes through the paper sheets, and there is a drawback that the accurate detection timing, length, and interval between successive paper sheets cannot be detected.

The object of the present invention is to eliminate the above-mentioned drawbacks and to make it possible to accurately detect the passage timing, the length, and the interval between successive paper sheets, even for paper sheets made of a transparent member. The present invention is to provide a carrier device.

[0006]

A paper sheet transporting apparatus of the present invention is a paper sheet transporting apparatus for transporting paper sheets for the purpose of transportation such as sorting and stacking, and is arranged near the transporting path and is provided in the transporting path. The configuration is such that the passage timing of the paper sheets moving along, the length of the paper sheet in the conveying direction, and the interval between successive paper sheets are detected based on the transmission and reception of ultrasonic waves.

Further, the paper sheet conveying apparatus of the present invention has a structure in which the transmission / reception of the ultrasonic waves is performed while ensuring a transmission / reception state in which the transmission path is blocked by the paper sheets advancing along the conveyance path. ..

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

The embodiment shown in FIG. 1 exemplifies a case where a postal envelope is conveyed as a paper sheet, and a pair of opposed conveyor belts 20 for sandwiching the paper sheet 10 and conveying it in a conveying direction C are provided.
And an ultrasonic sound generator 30 and an ultrasonic sound receiver 40 arranged so that the transmission and reception transmission paths are blocked by the passage of the paper sheet 10, and the output of the ultrasonic sound receiver 40 is received and converted into an electrical signal. The conversion unit 50 and the paper sheet 1 that receives the output of the conversion unit 50
The control unit 60 detects the passage timing of 0, the length, and the interval (presence / absence of a paper sheet) with the subsequent paper sheet, and controls the conveyance of the paper sheet 10.

Next, the operation of this embodiment will be described.

The sheet 10 is held by a conveyor belt 20 and is conveyed in a conveying direction C at a constant speed.

The ultrasonic sound generator 30 constantly sends ultrasonic waves to the ultrasonic sound receiver 40.

The ultrasonic sound receiver 40 detects the presence or absence of ultrasonic waves, and the detected output signal 401 is output to the converter 50.

The converting section 50 converts the input sound wave into an electric signal, and outputs "H" level when the paper sheet 10 blocks the ultrasonic wave 10 and outputs "L" level otherwise. ..

Based on the signal from the conversion unit 50, the control unit 60 calculates the passage timing, the length, the interval between successive sheets, etc., which is output as the output signal 501 of the sheet 10. The passage timing is determined by detecting the start and end timings of the interruption of the ultrasonic wave transmission / reception by the sheet 10, and the length is determined by the above-mentioned detection timing and a constant transport speed. Is easily calculated based on the time and the constant transfer speed, and these are used as important parameters in the transfer control of the use 10.

FIG. 2 is a diagram showing an example of the output signal form of the paper sheet 10 and the converter 50 in the embodiment of FIG.

In the embodiment of FIG. 1, the paper sheet 10 is a vinyl envelope, and the material thereof is optically transparent vinyl.

The paper sheet 10 contains the contents 11 therein and generally blocks light. Note that the use 10 has a destination label 12.

When the paper sheet 10 is conveyed by the conveyor belt 20 and passes through the ultrasonic wave transmission path formed by the ultrasonic sounder 30 and the ultrasonic sound receiver 40, the output signal 501 obtained by the converter 50 is shown in FIG. Shown in.

As shown in FIG. 2, even if the paper sheet is a transparent vinyl envelope, the ultrasonic waves transmitted from the ultrasonic generator 30 are
The ultrasonic sound receiver 4 is reflected or absorbed on the surface of the paper sheet 10.
Never reaches 0. Therefore, the level between AB is "H" and the other levels are "L". Although FIG. 2 shows the photoelectric switch output signal for comparison, the photoelectric switch output is expressed as “H” level only between BC.

In this way, by using the ultrasonic switch instead of the photoelectric switch, it is possible to reliably detect the passage timing, the length, and the distance to the succeeding sheet even with a transparent sheet.

[0023]

As described above, according to the present invention, a switch for detecting the passage timing, the length of a sheet to be conveyed, the distance between the sheet and the succeeding sheet, etc. is used to generate and receive an ultrasonic wave. By using the ultrasonic switch, it is possible to accurately detect even an optically transparent sealed letter.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing an example of output signals of a paper sheet 10 and a conversion unit 50 of FIG.

[Explanation of symbols]

 10 Paper Sheet 20 Conveyor Belt 30 Ultrasonic Sound Generator 40 Ultrasonic Sound Receiver 50 Converter 60 Controller

Claims (2)

[Claims] 1. A paper sheet transporting device for transporting paper sheets for the purpose of transportation such as sorting and stacking, which is arranged in the vicinity of a transport path, and the passage timing of the paper sheets moving along the transport path, the paper sheet. A sheet conveying device, characterized in that the length of a sheet in the conveying direction and the interval between successive sheets are detected based on the transmission and reception of ultrasonic waves. 2. The paper sheet according to claim 1, wherein the transmission and reception of the ultrasonic waves are performed while ensuring a transmission / reception state in which the transmission path is blocked by the paper sheets traveling in the conveyance path. Transport device.