JPH0211496B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal reading device for paper sheets, and in particular, a signal reading device that is conveyed at a relatively high speed and is capable of reading information from paper sheets. A head roller is installed at a position opposite to the magnetic sensor to be read, and is designed to maintain good contact between the sensor and the paper sheet by conveying the paper sheet while holding it between the sensor and the magnetic sensor. Regarding improvements.

[Conventional technology]

Information devices such as banknote inspection devices, card readers, and postal code readers are equipped with signal reading devices for paper sheets, and the information obtained from these signal reading devices is subjected to various signal processing to determine, for example, the denomination. , and performs other checks such as authenticity. However, such reading devices generally use printed patterns on paper sheets as information and read them magnetically or optically, but magnetic heads are often used as sensors for magnetic devices. It's here. In order to magnetically read printed patterns accurately with this type of reading device, even if paper sheets such as banknotes have folds, cuts, wrinkles, or other areas where the flatness is impaired, the paper must be kept at a constant pressure. It is necessary to ensure that the leaf remains pressed against the magnetic head; any lifting or bouncing will impair the reading function. Furthermore, it is desirable that there should be no mechanical impact or noise caused by magnetostrictive effects when the edges or folds of the banknote pass through, and for this purpose, it is desirable to have appropriate flexibility, for example, softness due to elasticity. In this case, it is necessary to press the paper sheet into contact with the magnetic head.

FIG. 2 shows an example of a conventional signal reading device of this kind, where 1 and 2 are upper and lower guide plates forming a conveyance path 3, and 4 is a guide plate provided in this conveyance path 3. It is a magnetic head. Reference numeral 5 designates a pinch roller (head roller) that is placed opposite the magnetic head 4 so as to maintain light contact therewith. be supported. A torsion coil spring 9 is sealed between the mounting seat 8 and the arm 6, and the spring force of the spring 9 constantly biases the head roller 5 toward the magnetic head 4 to maintain contact therewith. The outer circumferential surface of the head roller 5 is made of an elastic material such as rubber, and the banknotes conveyed from the direction of arrow A are guided to the contact area between the roller 5 and the magnetic head 4, and are made of an elastic material such as rubber. The head roller 5 itself rotates while being held between the two by the frictional force of the head roller 5 and conveyed to the left in the figure.

Further, FIG. 3 shows an example of another conventional signal reading device, and 15 is a pinch roller (head roller) provided at a position opposite to the magnetic head 4 and the conveying path 3. In this example, the head roller 15 The structure is such that a gap is maintained between the magnetic head 4 and the magnetic head 4. That is, the head roller 15 is pivotally supported by a support metal 17 by a support pin 16, and the support metal 17 is rotatably attached to a bracket 18 via a pin 19, and the support metal 17 and the bracket 18 are connected to each other. Spring 2 caught between
It is biased downward by a spring force of 0, and in this state a predetermined gap is maintained between the head roller 15 and the magnetic head 4. For example, since the thickness of a banknote is approximately 0.1 mm, the dimension of the gap is set to approximately 0.05 mm, which is slightly smaller than this thickness. In FIG. 3B, 21 is a timing belt that drives a toothed conveyance roller 22, and 23 is a conveyance roller 24.
This is a conveyor belt that is driven in contact with the magnetic head 4 and the head roller 15, which is held between the conveyor belt 23 and synchronized rotation of the conveyor roller 24.
Here, the banknotes that have been led to the magnetic head 4 are conveyed without resistance as they are rotated by the head roller 15, which is driven to rotate in synchronization with the conveyance speed of the banknotes.
The magnetic head 4 is moved by the head roller 15 with the spring force of
keep it pressed against the

[Problem to be solved by the invention]

The conventional signal reading device shown in FIG. 2 has a simple structure and is easy to manufacture, so there is no problem in practical use as long as the paper money is transported through the device at a speed of about 30 cm/sec. Therefore, it has been used in devices for inserting banknotes one by one, such as vending machines and money exchange machines at stations, or early automatic deposit machines installed in cash service corners of banks. However, today, even in the case of automatic teller machines, for example, in order to shorten the processing time, the banknotes are loaded in bundles all at once. It is necessary to sequentially unwind and convey the banknotes one by one and read the signals, and therefore the conveyance speed is fast, at 150 cm/sec, which is five times faster than in the past. Therefore, when trying to apply a conventional signal reading device as shown in FIG. 2 to such equipment, the resistance force is generated because the speed at which the bill is guided to the contact area between the roller 6 and the magnetic head 4 is high. The paper currency is too strong to be clamped, resulting in a jam (bill jam), damage, or failure to maintain the correct posture required to maintain identification accuracy.

Further, in another conventional signal reading device shown in FIG. 3, a slight gap is provided between the head roller and the magnetic head, and the head roller is rotated in accordance with the conveyance speed of the banknote.
Since the resistance when the bill is guided between the head and the head roller is reduced, there is almost no risk of jamming even during high-speed conveyance, compared to the conventional device shown in Figure 2. Although good conveyance characteristics can be obtained by using the magnetic head 4, the structure is complicated and the cost is high.
Even if there is no problem in use, the gap between the head roller 15 and the head roller 15 must be readjusted, and if the readjustment is not done, there is a risk of misidentification.
Recalibration is required at relatively short intervals.

The present invention was made in view of the above-mentioned problems, and its purpose is to minimize the probability of banknote jamming, reduce the frequency of holding inspections for adjustments, etc., and improve the structure. To provide a signal reading device for paper sheets that is simple and inexpensive.

[Means to solve the problem]

In order to achieve such an object, the present invention has been developed by sandwiching paper sheets between a sensor and a head roller that is rotatably supported by a support pin and presses against the sensor while maintaining elasticity under a predetermined pressure. In a signal reading device for paper sheets, which uses a sensor to read the information possessed by the paper sheets when the paper sheets are transported by the drive of the conveyance roller, the head roller is made of a tetrafluoroethylene resin material, and the head roller is made of a tetrafluoroethylene resin material, The annular membrane body is machined so that an engaging part protruding toward the shaft is provided in the part, and the chamfered side ends are press-fitted into the membrane body so that they engage with the engaging parts of the annular membrane body. It is characterized by being composed of an annular elastic body.

[Effect]

Paper jams occur in this type of head roller because when a banknote is guided to the contact area between the magnetic head and the head roller, a large frictional resistance is generated by the head roller, which is constantly pressed against the magnetic head. It is to receive. In this case, the contact surface of the magnetic head is generally polished to a glossy extent, so the friction between the magnetic head and the banknote is small and no significant resistance is generated. The outer circumferential surface of the head roller that maintains its contact is formed using a rubber material or the like, and in such a case, the coefficient of friction is 1 or more than 1 and a large resistance force is generated against the banknote.

Furthermore, in order to rotate the head roller while the bill is held between the magnetic head and the head roller, it is necessary to overcome the pressing force from the head roller to lift it, and to overcome the inertial force of the head roller to rotate it. During this time, the frictional resistance due to static and dynamic friction acting between the two causes paper jams to occur.

In the present invention, based on the above considerations, the head roller is composed of an annular film body made of a tetrafluoroethylene resin material having a low coefficient of friction, and an elastic body press-fitted into the film body. It becomes possible to reduce the static and dynamic friction forces that occur when paper sheets come into contact with the head roller.

Furthermore, since the membrane body and the elastic body constituting the head roller are connected by providing an engaging part on the membrane body and press-fitting the elastic body, it is possible to obtain a head roller with good durability and dimensional accuracy. can.

〔Example〕

The present invention will be explained in detail below based on the drawings. Note that, as described above, the present invention does not maintain a predetermined gap between the magnetic head and the head roller, but instead presses the head roller toward the magnetic head with a certain pressure, so that the head roller is pressed against the rotating surface of the head roller appropriately. Therefore, the following description will be made assuming that the head roller is of the type shown in FIG. 1.

FIGS. 1A and 1B show an embodiment of the present invention in which, as shown, only the skin layer of the rotating contact surface is made of a material with a low coefficient of friction. Here, the head roller 35 has an annular elastic body 36 disposed around the core metal 27, and this elastic body 36 is made of urethane rubber or other rubber material as in the conventional case, and the outer circumference of the elastic body 36 is made of urethane rubber or other rubber material. A film body 37 made of tetrafluoroethylene resin is provided around the surface as a material having a low coefficient of friction. Reference numeral 38 denotes an engaging portion formed by protruding both end portions of the membrane body 37 toward the shaft side. body 37
By press-fitting the elastic body 36 into the membrane body 37, the engagement between the membrane body 37 and the elastic body 36 is completed.

The method of engaging the membrane body 37 and the elastic body 36 is as follows:
A method using an adhesive or heat shrinkage of the film body is also considered, but when the film body 37 is made of tetrafluoroethylene resin as in the present invention, sufficient adhesive force cannot be obtained with the former method and the strength of the head roller is reduced. In addition, in the latter method, the membrane 37 is heat-shrinked in an extremely high temperature atmosphere, so it is likely to be deformed, resulting in a decrease in the dimensional accuracy of the head roller. There is a risk of it being stored away.

Note that the thickness of the membrane body 37 must be set to a level that does not impair the elasticity obtained by the elastic body 36.
It has been confirmed through experiments that a thickness of about 0.2 to 0.6 mm is suitable, considering the wear caused by friction between banknotes and magnetic heads.

Further, in order to form the film body 37 of the head roller 35 of this embodiment having the above-mentioned structure, it is sufficient to finish it by cutting a tetrafluoroethylene resin material formed into a columnar shape.

Although such processing requires some effort, since elasticity and low-friction properties are constructed by a combination of an elastic body and a low-friction film body, it is possible to provide products that are suitable for different uses.

〔Effect of the invention〕

As explained above, according to the present invention, a sheet of paper is guided between a magnetic head and a head roller that is pressed against an information reading sensor, for example, a magnetic head, with a constant pressure. In a signal reading device designed to read information, the rotating surface that rotates while being pressed by the head roller is made to maintain appropriate elasticity, and this pressing surface is made of a material (tetrafluoroethylene resin) that has low frictional resistance against paper sheets. ), it is possible to prevent paper errors from occurring in the reading device, and furthermore, even if the magnetic head or head roller is worn out, it will automatically follow up, reducing the inspection period for mutual adjustment. It can be extended significantly.

In the above description, the case where the present invention is applied to a bill validating device has been described, but the present invention is not limited to this, and can be applied to card readers and postal code reading devices as devices for reading information contained in paper sheets. Furthermore, it goes without saying that it can be widely applied to ticket reading devices for trains, buses, etc.

[Brief explanation of drawings]

1A and 1B are a side view and a front view, respectively, showing the structure of a head roller according to the present invention, and FIGS. 2A and 2B show an example of the structure of a conventional paper sheet signal reading device. FIGS. 3A and 3B are a side view and a plan view, respectively, showing an example of the configuration of a conventional high-speed conveyance type paper sheet signal reading device. 1, 2... Guide plate, 3... Conveyance path, 4... Magnetic head, 5, 15, 35... Head roller, 6
...Arm, 7...Branch shaft, 8...Mounting seat, 9
... Spring, 16 ... Pivotal support pin, 17 ... Supporting metal fittings, 18 ... Bracket, 19 ... Pin, 20 ...
... Spring, 21 ... Timing belt, 22, 24
...Conveyance roller, 23...Conveyance belt, 27...
Core metal, 36... Elastic body, 37... Membrane body, 38...
Attachment part.

Claims (1)

[Scope of Claims] 1. A sheet of paper is held between the sensor and a head roller that is rotatably supported by a support pin and presses against the sensor while maintaining elasticity under a predetermined pressure, and the sheet of paper is held between the head roller and the sensor, In the signal reading device for paper sheets, the head roller is made of enlene tetrafluoride resin material, and the head roller is made of enlene tetrafluoride resin material, and both ends of the inner circumference thereof are an annular membrane body that is cut so as to have an engaging part protruding toward the shaft side; 1. A signal reading device for paper sheets, characterized by comprising a press-fitted annular elastic body.