JPS6022452Y2 - Paper sheet conveyance mechanism in paper sheet identification device - Google Patents

Description

[Detailed description of the invention] This invention is used in automatic currency exchange machines, etc., in which a magnetic head is used to distinguish the characteristic elements of paper sheets such as banknotes. The purpose of this paper is to improve the mechanism for transporting paper sheets into the device, so that the paper sheets carried into the device can be skillfully inserted into the magnetic head part without getting stuck in the magnetic head part, and the paper sheets can be transported smoothly. The purpose of this method is to forcibly straighten folds, wrinkles, etc. at the detection point by a magnetic head, so that magnetic signals displayed on paper sheets can be detected correctly.

For example, in order to distinguish the authenticity of banknotes, a device has been implemented that takes advantage of the fact that banknotes are printed with magnetic ink and scans the banknotes with a magnetic head to examine the magnetic patterns.

In this device, there are belt conveyance methods, roller conveyance methods, etc. as means for conveying paper sheets to the magnetic head installed in the middle of the conveyance path, but the present invention relates to the latter roller conveyance method. be.

The conventional configuration of a sheet conveyance mechanism using such a roller conveyance method is shown in FIGS. 1 and 2.

Note that FIG. 2 shows only the lower part of the conveyance path shown in FIG. 1.

In the figure, numerals 1 and 2 are frames of the identification device, and a paper sheet conveyance path 3 in the direction of arrow A is defined between the frames.

Reference numerals 10 and 11 indicate guides for paper sheets arranged vertically along the conveyance path 3.

Paper sheets are indicated by two-dot chain lines.

1 on the left and right so that the rollers sandwich the edges of both sides of the paper sheet 4 carried in from the outside into the conveyance path 3 from above and below.
A plurality of pairs of upper and lower conveyance rollers 5I, 5II, . . . are arranged along the conveyance path 3 at intervals shorter than the length of the paper sheets.

Further, they are connected by left and right roller shafts 5a.

One of the pair of rollers 5B1 and 5B2 is a driving roller rotated by the motor 6, and 5A1 and 5A2 are driven rollers 5B1 and 5A2 which are biased toward the rollers 5B1 and 582 by pressure via a spring pressing mechanism (not shown). It's Laura.

The paper sheets 4 carried in from the left side in the figure by the above-described mechanism are conveyed in the direction of arrow A while being sequentially relayed by conveyance rollers 5I, 5II, . . . .

Detection of characteristic elements of the paper sheet 4 is performed by a magnetic head 7 , and this magnetic head 7 is disposed midway along the conveyance path 3 .

Moreover, in order to bring the paper sheet 4 into close contact with the magnetic head 7, a head roller 8 serving as a pressing mechanism is installed opposite the magnetic head 7.

This head roller 8 is movable in the vertical direction and is pressed against the magnetic head 7 via a biasing spring 9, and the sheet 4 sent between the magnetic head 7 and the spacing drawer 98 is directed against the magnetic head 7. This ensures close contact and suppresses the detection of magnetic signals.

However, in the above conventional configuration, the conveyance rollers 5I, 5II...
- The group is only considered as a means for conveying the paper sheets 4 along the conveyance path 3 in the direction of arrow A, while the magnetic head 7 is used to convey the paper sheets 4 between the conveyance rollers 5I and 5II. The arrangement is based on the idea that signal detection is performed during the relaying process, and the installation location has conventionally been set at an intermediate position between the transport rollers 5I and 5I[.

Further, in this configuration, the shaft 5a of the conveying roller is connected to the magnetic head 7,
Another advantage is that it is easy to manufacture because it does not interfere with the head roller 8.

However, in the conventional configuration in which the magnetic head 7 is located between the conveyance rollers as shown in FIGS. 1 and 2, paper sheets with folds and curves are carried in. It turned out that this would cause some inconvenience.

Generally, the wrinkles of the paper sheet 4 are removed by the conveyance roller 5I, which pinches it from above and below.
In the process of passing through 5II, it is lengthened once.

Paper sheets have some degree of stability, so they wrinkle again after passing through the conveyance roller.

Now, when the sheet 4 reaches the magnetic head 4 with this wrinkle still in place, it is inserted between the sheet 4 and the magnetic head 7 while pushing up the head roller 8 upwardly against the force of the spring 9.

In this case, since the magnetic head 7 is fixed, the frictional force acting between it and the paper sheet 4 is greater than that of the rotating head roller 8, and therefore, unlike the other conveyance rollers 51 and 5n, wrinkles are smoothed out. The effect is not sufficient.

Particularly in the case where the head roller 8 is free to rotate and is not driven by a motor, the paper sheet 4 is stationary when it is inserted, and therefore tends to bend due to friction and promote wrinkles.

Therefore, there is a possibility that the sheet passes through the magnetic head 7 with the sheet bent or wrinkled.

This will be explained with reference to FIG.

In FIG. 5, the same components as in FIG. 1 are indicated by the same reference numerals, and FIG. A state in which the wrinkled portion P passes between the magnetic head 7 and the head roller 8 is shown.

Since the head roller 8 is not driven by a motor and is pressed by the magnetic head 7, which applies frictional force to the paper sheet 4, the wrinkled portion P is caused by the magnetic head 7 as shown in FIG. 5a.
When it is in front of the heddle roller 8, the wrinkled portion P is bent by the force in the direction of the arrow A and passes through the magnetic head 7 in a bent state as shown in FIG.

In this case, detection of magnetic signals for the folded portions becomes inaccurate, and highly accurate discrimination cannot be performed.

In addition, if the pressure of the head roller 8 is increased in order to remove wrinkles as much as possible, weak paper sheets may not be inserted into the magnetic head 7 properly and may become jammed on the front side, or the S/S/ A negative effect on the N ratio occurs.

Moreover, even if the leading edge is successfully inserted into the magnetic ladle 7, when the folded part (reference numeral P in FIG. 1) is reached, the head roller 8 jumps up and brings the paper sheet 4 into close contact with the magnetic ladle 7 again. In the meantime, the paper sheet 4 may advance forward and become undetectable.

Now, if we consider the state of wrinkles, Figure 6 a, b, c
Wrinkles as shown in the figure are possible.

The wrinkles shown in FIG. 6A can pass through the magnetic head 7 in a stretched state due to the pressure of the head roller 8, but the wrinkles shown in FIG. It passes through the magnetic head 7 in a bent state,
The wrinkles as shown in FIG. 6C may get stuck in the magnetic head 7 or cause the head roller 8 to bounce up and pass through the magnetic head 7.

As described above, in the conventional method, when a wrinkled paper sheet is brought in, the magnetic head cannot correctly detect the signal, and highly accurate identification cannot be achieved.

If the wrinkles in the paper sheets are smoothed out when they are brought into contact with the magnetic head, the above-mentioned difficulties can be solved satisfactorily.

For this purpose, the present invention utilizes a conveyance roller to actively apply a wrinkle-removal effect to the paper sheet at the conveyance position of the magnetic head, so that signal detection can be performed correctly. The object of the present invention is to provide a conveyance mechanism that allows smooth insertion and introduction.

According to the present invention, this object is distantly achieved by arranging at least one set of conveyance rollers slightly in front of the magnetic head in the sheet conveyance direction.

In addition, in this case, the setting position of the conveyance roller is slightly in front of the magnetic head, for example, 1ON! It is preferable to set the position within the range of It.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

Figures 3 and 4 show a side view and a plan view of the paper sheet conveyance mechanism according to the present invention, and correspond to Figures 1 and 2, respectively, and the same components are the same. Indicated by a symbol.

Now, in the present invention, in the direction of the conveyance path 3, a set of four conveyance rollers that sandwich both side edges of the paper sheet 4 from above and below are installed slightly in front of the installation position of the magnetic head 7. 5'I
I have been installed.

This slightly nearer side is within a range of about ICkIn as described above.

Next, the action of the conveyance roller 5'I[ will be explained with reference to FIG.

The conveyance roller 5'lI is a pair of upper and lower rollers 5'A and 5'B.
Since the roller 5'B is configured to be driven by a motor, when the paper sheet 4 having wrinkles P as shown in FIG. 7a enters the conveying roller 5'II, the roller 5'B The wrinkles P are conveyed while being stretched out by the driving force shown in FIG. 7S, and when the wrinkles P come out from the conveyance roller 5'I, they are slightly restored as shown in FIG. 7C.

However, if the distance 1 between the conveyance roller 5'II, the magnetic head 7, and the head roller 8 is short, the height of the wrinkles restored after passing through the conveyance roller 5'I[ is small, and the wrinkles P are Although it may be restored to the form shown in
It will not restore to the shape shown in Figure c.

Therefore, the wrinkle P is inserted between the magnetic head 7 and the head roller 8 with only slight restoration.

Further, according to the present invention, the conveying roller 5'II is connected to the paper sheet 4.
However, the part located on the magnetic head 7 (the center of the paper sheet) can be stretched to the extent shown in Figure 6a, and the rest is pressed by the head roller 8 by stretching it by pressure. Paper sheets can be brought into close contact with the magnetic head 7.

According to the above configuration, the part of the sheet inserted between the magnetic head 7 and the head roller 8 is always connected to the pair of upper and lower rollers of the conveyance roller 5'II at both side edges immediately before the insertion. It is sandwiched between 5'A and 5'B from above and below and fed by rollers.

However, as mentioned above, the upper and lower rollers 5'A of the conveying roller
, 5'B are driven by a motor, so the wrinkle smoothing effect is great.

Moreover, since a wrinkle smoothing action is forcibly applied to both side edges of the paper sheet, for example, if there is a curved wrinkle (section P shown in FIG. 1) running laterally in the middle of the paper sheet 4, However, at least in the area immediately after passing the conveyance roller 5'2, the wrinkles have been smoothed out to the extent that the sheet can be brought into close contact with the magnetic head 7 by the spacing roller 8.

Since the paper sheet 4 with its wrinkles forcibly smoothed out is introduced into the magnetic pad 7 located at approximately the same position, the paper sheet 4 will not get stuck between the magnetic head 7 and the head roller 8. It is possible to skillfully prevent inconvenient phenomena such as the head roller 8 jumping up due to wrinkles or wrinkles.

Therefore, the magnetic head 7 can correctly detect the magnetic signal that is a characteristic element of the paper sheet 4, and highly accurate identification can be performed.

In addition, according to the present invention, by arranging at least one set of conveyance rollers slightly in front of the magnetic head in the conveyance direction of paper sheets, the magnetic head can be forcibly moved from both sides even when the paper sheet is weak. Since the paper sheet is inserted into the magnetic head, it is possible to prevent paper sheets from clogging the magnetic head, which is the largest obstacle on the conveyance path.

Moreover, since clogging can be prevented, the conveyance speed of paper sheets can be increased, and the processing capacity of the identification device can be improved.

As described above, according to the present invention, paper sheets can become jammed in the magnetic head part, which was considered to be a difficult point in conventional conveyance mechanisms.
In addition, it is possible to provide a paper sheet conveyance mechanism that has high identification accuracy and excellent functionality by skillfully preventing phenomena in which magnetic signals cannot be detected due to head rollers bouncing up due to folds or wrinkles.

[Brief explanation of drawings]

Figures 1 and 2 are a side view and a plan view showing a conventional conveyance mechanism, Figures 3 and 4 are a side view and a plan view of an embodiment of the present invention, and Figure 5 is a wrinkle passing through the magnetic head. FIG. 6 is an explanatory diagram of the state of wrinkles, and FIG. 7 is an explanatory diagram of the wrinkle smoothing effect of the conveying roller of the present invention. 3: Conveyance path, 4: Paper sheets, 5I, 5n: Conveyance roller 5
'n: conveyance roller installed slightly in front of the magnetic head, 7: magnetic head, 8: head roller as a pressing mechanism, 9: pressing spring, A: conveyance direction.

Claims (1)

[Scope of utility model registration request] Paper sheets are arranged so that the two edges of the sheet are held between the top and bottom and at least one of the upper and lower rollers is driven to feed the sheet, and the sheets are arranged in sets of 4 at intervals shorter than the length of the sheet. It is equipped with a conveyance roller arranged at a plurality of locations along a leaf conveyance path, a magnetic head for identification and detection installed in the middle of the conveyance path, and a pressing mechanism that brings the paper sheet into close contact with the magnetic head. 4, which is configured to feed paper sheets by driving at least one of the upper and lower rollers with both side edges of the paper sheet sandwiched between the upper and lower sides of the paper sheet slightly in front of the magnetic head with respect to the conveying direction of the paper sheet. A paper sheet conveyance mechanism in a paper sheet discrimination device, characterized in that a set of individual conveyance rollers is arranged.