JPH05301657A - Thickness detecting device - Google Patents

Abstract

PURPOSE:To prevent wrong detection caused by various kinds of noise and micro attachment at the time of detecting the attachment of a medium and double feeding. CONSTITUTION:A medium 1 is conveyed at constant speed by drive rollers 2, and the thickness of the medium 1 is converted into an electric signal by a magnetic sensor 9 through the medium of a movable roller 5 and a movable arm. The converted electric signal is averaged every fixed time by an averaging circuit 10, and this value is judged by a judging circuit 11 on the existence of abnormality in thickness within the detecting time. This results in preventing wrong detection caused by high frequency noise, micro attachment and noise fluctuation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thickness detecting device, and more particularly to a thickness detecting device for detecting deposits and double conveyance of banknotes in a cash handling machine.

[0002]

2. Description of the Related Art A conventional thickness detecting device, as shown in FIG. 3, has a movable roller that moves up and down according to the thickness of a medium, and a vertical movement of the movable roller uses a movable arm and a return spring as an intermediary. Means 2 for converting into an electric signal by a sensor
1, a means 22 for detecting and determining whether or not the obtained electric signal exceeds a reference value within a detection time obtained by a transmitted light sensor located on the conveying surface, and a result of the determination for an abnormal thickness 2
The result of either 5 or 24 is output.

[0003]

In this conventional thickness detecting apparatus, the medium thickness is determined to be abnormal when the output reference value is exceeded even in an extremely short time within the entire detection time. The thickness is determined to be abnormal even for sudden high-frequency noise and minute adhered substances on the medium.
In addition, due to the stationary noise of the magnetic sensor, circuit, cable, etc. and the temporal fluctuation of the stationary noise due to disturbance,
There has been a problem that the upper limit value of the output is larger than the actual thickness of the medium, and erroneous detection is likely to occur.

[0004]

SUMMARY OF THE INVENTION A thickness detecting device of the present invention comprises a transport system for transporting a medium at a constant speed, a fixed roller capable of only rotational movement across a transport path of the medium, and rotation and vertical directions. A pair of rollers having movable movable rollers, a movable arm that expands the vertical movement of the movable rollers around a support shaft, and a return spring that keeps the movable roller and the medium and the starting arm in close contact with each other. A medium including a magnetic sensor for converting the operation of the movable arm into an electric signal, an averaging circuit for averaging the output electric signal of the magnetic sensor at regular time intervals, and averaged data output from the averaging circuit. And a determination circuit for recognizing a thickness equal to or greater than the thickness of the.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention.

The medium 1 is conveyed on the conveying path by a driving roller 2 at a constant speed. The tip of the medium 1 is the transmitted light sensor 3
Thickness detection shall be started when passing over A / 3B. A fixed roller 4 is sandwiched below the conveyance path of the medium 1, and a space equal to the normal thickness of the medium is provided vertically above the fixed roller 4 so that the medium can move up and down in accordance with the attached matter and double thickness of the medium. And a movable arm 5 for expanding the vertical movement of the movable roller 5 around the support shaft 6. Further, a return spring 8 is provided in order to accurately correspond the thickness of the medium 1 and the operations of the movable roller 5 and the movable arm 7. The operation of the movable arm 7 is performed by, for example, a magnetic sensor 9 composed of a semiconductor magnetoresistive effect element / Hall effect element.
Is converted into an electric signal by, and sampling is performed every predetermined time, and the averaging circuit 10 creates averaged data. Further, it has a determination circuit 11 for determining whether or not the created averaged data exceeds a reference value for abnormal thickness.
When the thickness detection is ended when the rear end of the medium 1 passes through the above-mentioned excess light sensors 3A and 3B, and the reference value is exceeded by the determination circuit 11 between the start time and the end time described above, "there is an adhered matter on the medium". It is determined that the thickness detection is abnormal due to “or double conveyance”.

Next, the flow of operation will be described with reference to FIG.

That is, in this embodiment, a movable roller which moves up and down according to the thickness of the medium, and means 21 for converting the vertical movement of the movable roller into an electric signal by a magnetic sensor through a movable arm and a return spring. A means 22 for detecting and determining whether or not the obtained electric signal exceeds a predetermined reference value according to the type of medium within the detection time obtained by the transmitted light sensor located on the transport surface; As a result, any one of the abnormal thickness 25 and the normal thickness 24 is output.

[0009]

As described above, according to the present invention, when determining the thickness of the medium, by averaging the electric signals at regular time intervals, the high frequency noise and the minute deposits on the medium can be thickened. It will not be recognized as abnormal. Also a magnetic sensor,
This has the effect of preventing erroneous detection due to fluctuations in the magnitude of the steady noise due to steady noise and disturbance caused by circuits, cables and the like.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a thickness detection device of the present invention.

FIG. 2 is a flowchart showing an operation of thickness detection of the present invention.

FIG. 3 is a flowchart showing an operation of thickness detection according to a conventional technique.

[Explanation of symbols]

 1 medium 2 drive roller 3A / 3B transmitted light sensor 4 fixed roller 5 movable roller 6 spindle 7 movable arm 8 return spring 9 magnetic sensor 10 averaging circuit 11 judgment circuit

Claims (1)

[Claims] 1. A transport system for transporting a medium at a constant speed,
A set of rollers having a fixed roller capable of only rotational movement and a movable roller capable of rotating and moving vertically with the medium transport path sandwiched between the pair of rollers, and a movable roller that expands the vertical movement of the movable roller around a spindle. An arm, a return spring for keeping the movable roller, the medium and the starting arm in close contact with each other, a magnetic sensor for converting the operation of the movable arm into an electric signal, and an electric signal output from the magnetic sensor is averaged at regular intervals. And a determination circuit for recognizing the thickness of the medium or more based on the averaged data output from the averaging circuit.