JPS6021763Y2 - Seam detection device for sheets of banknotes, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sheet seam detection device, and more particularly, to a device for detecting deformed sheets bonded together with thin transparent adhesive tape, for example.

A flat plate or roller is placed facing a movable detection roller, the sheet is transferred between them, and when there is a seam in the sheet, the detection roller is displaced, which is used to detect the seam of the sheet. The device is known.

However, in this detection device, although the detection roller is rotatable, it is rotated by contact with the sheet when the sheet is transported, and since the detection roller is pressed against the opposing member, the sheet rushes into the detection roller. At times, resistance is applied to the sheet, making it difficult to convey the sheet smoothly, and there are also problems such as generation of noise and vibration of the detection roller, resulting in erroneous detection.

This invention has been made in view of the above-mentioned circumstances, and is intended to provide a sheet seam detection device that allows smooth sheet conveyance, generates little noise, and can perform accurate seam detection.

Hereinafter, based on the drawings, an embodiment in which this invention is applied to detecting abnormal paper defects bonded together with thin transparent adhesive tape will be described in detail.

Detection of such altered paper waste is particularly useful in automated teller machines, money changers, and other paper waste handling devices.

In FIG. 1 and FIG. 2, a detection roller 1 and a lower roller 2 (opposing member) are arranged vertically opposite each other at a place where a paper sheet or the like is inserted or carried.

A belt 14 is hung between the lower roller 2 and the pulley 11 at both ends thereof, and the lower roller 2 itself
Alternatively, it is rotationally driven by the pulley 11 via the belt 14.

A belt 15 is also hung between the front and rear pulleys 12 and 13 at both ends of the detection roller 1.
It is rotationally driven by either pulley 12 or 13 via.

The detection roller 1 is rotatably supported by a shaft 7 between a pair of left and right L-shaped levers 3 at the lower ends of these levers 3.

The lever 3 is swingably supported by a support shaft 4 at its bent portion, and the detection roller 1 is supported by a spring 1'6.
is biased to move clockwise around the support shaft 4.

Further, the upper half of the lever 3 contacts the stopper 17 against the force of the spring 16, and a slight gap is left between the rollers 1 and 2.

The stopper 17 is made up of, for example, a mounting member 17a that is fixed in place and has a female screw hole formed therein, and a threaded rod 17b that is screwed into the mounting member 17a, and can be freely adjusted in position by turning the threaded rod 17b. .

The size of the gap between both rollers 1 and 2 is preferably about half the thickness of the sheet.

The thickness of the paper sheet is about 1100IL, so the gap is 4.
The thickness is preferably about 0 to 60 μm.

The thickness of the adhesive tape that connects the paper parts, etc. is 40 to 50μ.
It is about m.

The upper half portions of the levers 3 extend upward for a relatively long length, and are connected to each other by a connecting rod 9 near their tips.

The actuator 6 of the pickup type displacement detector 5 is in contact with the center of the connecting rod 9.

This detector 5 magnetically or electrostatically detects the displacement of the actuator 6 and outputs an electric signal according to the displacement.

Since the portion of the lever 3 above the support shaft 4 is longer, the amount of displacement of the detection roller 1 is increased by the lever 3.

A paper failure detector 8 (for example, a photoelectric switch) is provided between the detection roller 1 and the pulley 12.

A plurality of spiral protrusions 10 are formed on the outer circumferential surface of the detection roller 1 in different winding directions.

It is sufficient that there is at least one protrusion 10 in each winding direction, but it is preferable to provide a large number of protrusions as shown in FIG.

The distance P between adjacent protrusions 10 is determined by the normally expected seam (
(adhesive tape) (see Figure 5).

Further, it is desirable that the helical angles A and B of each protrusion 10 are 45°.

Such a protrusion 10 is formed by cylindrical etching or molding.

The length of the portion of the detection roller 1 where the protrusions 10 are formed is preferably 273 or more, which is the length in the direction orthogonal to the banknote conveyance direction.

FIG. 4 shows an example of a seam detection circuit.

Further, FIG. 5 shows the output signals of each circuit shown in FIG. 4 in relation to the paper edge S, its seam T, and the protrusion 10 of the detection roller 1.

The center of the protrusion 10 is indicated by M in FIG.

Referring to these figures, the detector 5 detects the detected displacement amount a
This signal is sent to AND gate 26, which generates an output when V exceeds the required level V.

When the leading edge of the paper sheet S in the conveying direction enters between the detection roller 1 and the lower roller 2, a slight impact is applied to the detection roller 1.
The detection roller 1 is momentarily displaced.

In addition, if there is a seam T in the paper sheet S while it is being conveyed between the rollers 1 and 2, when the protrusion 10 comes into contact with this seam T, the detection roller 1 detects the seam T. , and a signal is generated from the detector 5.

On the other hand, from the paper error detector 8, the tip of the paper error S is detected by this detector 8.
An output is generated from the time when the paper reaches the position until the end of the paper sheet S passes the position of this detector 8.

This paper defect detection signal is sent to an on-delay timer 21 and an off-delay timer 23.

The on-delay timer 21 has the tip of the paper S connected to the detector 8.
After passing through the position and entering the detection roller 1, an H level signal is generated.

Since the rise of this H level signal is detected by the differentiator 22, the pulse b is output when the leading edge of the paper sheet S slightly looks forward from the detection roller 1 (position O in FIG. 1).

The off-delay timer 23 is set when the end of the paper S is the detector 8.
When it passes the position and comes a little in front of the detection roller 1 (position F in FIG. 1), it outputs an L level signal.

The rise of this L level signal is detected by the differentiator 24, and a pulse C is output.

Since the flip-flop 25 is set by the pulse b and reset by the pulse C, the set signal d is output during this period and the AND gate 26 is opened.

Therefore, while the flip-flop 25 is set, the signal output from the detector 5 is output from the AND gate 26.
The seam detection signal e is output as the seam detection signal e.

Also, when the leading edge of the paper edge enters the detection roller 1 and the end of the paper edge leaves the detection roller 1, the AND
The gate 26 is closed to prevent false detections due to instantaneous displacements of the detection roller 1 occurring at these times.

As described above, since the detection roller 1 is formed with spiral protrusions 10 that wind in different directions, it is possible to determine whether the seam T is perpendicular to the conveyance direction, parallel to it, or diagonal. In either case, the seam T is always in contact with the protrusion 10, and the seam T is reliably detected.

The spiral protrusion may be formed so as to be wound only in one direction.

Since there is a gap between the detection roller 1 and the lower roller 2, the impact applied to the detection roller 1 when paper damage enters the detection roller 1 is small, and therefore the detection roller at this time The displacement amount a of 1 also does not rise significantly.

The noise generated is also lower.

A signal indicated by a chain line E in FIG. 5 indicates a case where the paper is pushed into the detection roller 1 while the detection roller 1 is in pressure contact with the lower roller 2.

If both rollers 1 and 2 are in contact with each other in this way, the detection roller 1
Since the amount of displacement a becomes large, it is necessary to further delay the output of the on-difference timer 21 in order to prevent false detection due to this.

In this case, the length of the detection range becomes shorter in the paper transport direction.

However, in this invention, since there is a gap between both rollers 1 and 2, the amount of displacement a of the detection roller when a paper defect enters the detection roller 1 is small, making it possible to widen the detection range of the seam.

In addition, in this invention, since the detection roller 1 is constantly driven to rotate, resistance when a piece of paper enters the detection roller 1 is eliminated, and the paper is transported smoothly.

It goes without saying that this invention can be applied not only to the detection of paper defects but also to the detection of seams in other sheet-like conveyed objects.

Furthermore, the configuration of the device is not limited to the above example.

For example, the following modifications can be considered.

When tensioning the transport belt in two locations near the center,
It is preferable that the detection roller or its spiral protrusion be provided in three locations, one on each side of the belt and one in the middle.

If the sheet has relatively high rigidity or transport force, the opposing member may be a flat plate or a curved plate.

Detection of the amount of displacement of the detection roller can also be realized by providing the detection roller support lever and the fixing member with a magnet and a magnetoelectric transducer that detects changes in magnetic flux, respectively.

Furthermore, the seams of sheets include not only tape but also sheets that are partially overlapped and pasted together.

As explained in detail above, in the device for detecting joints of sheets such as paper sheets according to this invention, since a plurality of spiral protrusions are formed on the outer peripheral surface of the detection roller, the joints of the transported sheets are detected. Seams can be detected as long as they are not parallel to the protrusions.

Therefore, it is possible to accurately detect not only joints perpendicular to the transport direction but also joints parallel to the transport direction.

Furthermore, since the distance between adjacent ridges is wider than the expected width of the tape, when a sheet with seams parallel to the transport direction is transferred, certain ridges may While in contact with the seam (tape), protrusions adjacent to the protrusion do not come into contact with the seam.

Therefore, the detection signal is output multiple times.

Furthermore, the total time during which the detection signals are output is longer than the time during which the width of the tape is conveyed.

Therefore, it is possible to accurately detect seams parallel to the transport direction.

Further, it is possible to prevent dust attached to the sheet from being mistakenly detected as a seam.

[Brief explanation of the drawing]

Fig. 1 is a side view of the seam detection device, Fig. 2 is a front view thereof, Fig. 3 is a perspective view showing another example of the detection roller, Fig. 4 is a block diagram showing an example of the seam detection circuit, and Fig. 5 The figure is an explanatory diagram showing the relationship between the output signal of each block in FIG. 4 and the seam of the sheet. 1...Detection roller, 2...Lower roller (opposing member), 5...Displacement amount detector, 10...
Protrusions, P... spacing between protrusions, S... paper ridges (sheet), T... seams (adhesive tape).

Claims (3)

[Scope of utility model registration request] (1) A sheet of paper or other material is transferred between a detection roller and a member facing it, and the seam of the sheet is detected based on the displacement of the detection roller due to the seam of the sheets pasted together with tape such as adhesive tape. In the apparatus, a paper characterized in that a plurality of spiral protrusions are formed on the outer peripheral surface of the detection roller, and the interval between adjacent protrusions is wider than the normally expected width of the tape. Our sheet seam detection device. (2) The apparatus for detecting a seam of a sheet such as a sheet of paper according to claim 1, wherein the opposing member is a roller. (3) The apparatus for detecting a seam of a sheet such as a sheet of paper according to claim 1, wherein the opposing member is a flat plate or a curved plate.