[0001] The object of the present invention is a device and method for counting and classifying
coins.
[0002] More in particular, the invention relates to a device and method based on an optical
detection corresponding to a coin's dimension such as the diameter, and able to assign
a given class or value to the coin.
[0003] At present, classification systems are known which are based on the reading, by means
of a detection device, of a beam of light directed towards the region of transit of
the coins.
[0004] In these known systems, the coin, as it moves on, intercepts the beam of light and
dims the sensor by an extent corresponding to the diameter of the coin.
[0005] The detection of the sensor is processed by an electronic unit which provides for
counting the coins in transit and classifying them on the basis of the detected diameter.
[0006] The known systems exhibit some drawbacks as far as the reliability of detection is
concerned, because of the normally illuminated state of the detection sensor, and
of possible false readings due to the deviation of the light, emitted by the light
source, that reaches the sensor. Moreover, such systems generally need a light opposite
to the transit of coins and, consequently, of bulky mechanical parts on both sides
of the path covered by the coin.
[0007] A first object of the present invention is to propose a classifier device without
the drawbacks of the known devices.
[0008] The object of the invention is achieved by a device and method according to the attached
independent claims.
[0009] Further advantages are achieved by a device and method according to the attached
dependent claims.
[0010] The technical characteristics of the invention, according to said objects, are clearly
set forth by the content of the following claims, and the advantages of same invention
will result more clearly from a reading of the detailed description given herebelow,
reference being made to the accompanying drawings which show but an exemplary and
non-limiting embodiment thereof. In the drawings:
- Fig. 1 shows a first embodiment of a coin-counting device according to the invention;
- Fig. 2 shows a second embodiment of the invention;
- Fig. 3 shows a detail of a sensor unit according to the invention; and
- Fig. 4 shows a detail of the sensor unit.
[0011] With reference to the accompanying drawings, a coins-classifier and counter 1 according
to the invention comprises a supply 12 for feeding coins to be classified and counted,
in the described case said supply consisting of a hopper with a rotating bottom 13
for driving a succession of coins 3 towards a deflector 14 which directs the coins
to a flat path 2 for the coins to slide therealong.
[0012] Associated with the path 1 is at least one light source 4 to illuminate at least
one reading region of said path which the coin 3 is to be passed through for the detection
thereof.
[0013] In the described examples, the region 5 comprises a transparent window formed in
the plane of transit of the coins.
[0014] In the illustrated embodiment, the source 4 is also made up of an array of LEDs 6
disposed on the side of region 5 opposite to the sliding surface of coins 3 along
the path 2.
[0015] Associatred with the source 4 is a linear sensor 7 for optical detection, comprising
a number of detection pixels 8 located along the path 1 and lined up transversally
to the direction of transit of the coins 3.
[0016] Advantageously, according to the invention, the ligth source 4 and the detection
sensor 7 are both disposed on the side opposite to that of transit of the coin 3 and
make up an illumination and detection unit 8 associable with a reading region 5.
[0017] Connected to the sensor 7 is a processing unit 9 which, upon using the device, receives
from the sensor a signal representative of the number of illuminated pixels and which,
in turn, is associable with the diameter of the coin in transit.
[0018] According to the invention, the sensor 7 and the source 4 are so disposed as to have
the sensor resulting normally in black-out conditions and receiving a luminous radiation
only when a coin transits through the region 5.
[0019] To this end, provision may be made for a shield 10 preventing the ambient light from
reaching the sensor 7 thus altering and disturbing the detection of transit of the
coins.
[0020] In the embodiment shown in Fig. 1, the path 1 of transit comprises a side abutment
11 along which the coins slide in contact therewith as they move through the reading
region 5.
[0021] In this embodiment, the sensor 7 is transversally offset by a distance "d" with respect
to the abutment 11 so as to receive only part of the light hitting the coin's face
illuminated by the light source and reflected towards the sensor. This disposition
of the sensor 7 allows illuminating a plurality of pixels which corresponds to a value
of the coin's diameter save for the extent "d".
[0022] In the embodiment shown in Fig. 2, the region 5 extends completely across the path
2, so as to illuminate the coins 3 throughout their diameter, and the processing unit
9 acquires a signal corresponding to the maximum M number of pixels illuminated by
the light reflected by the transiting coin and associates univocally the same signal
to the diameter of the coin.
[0023] Figs. 3 and 4 show schematically an illumination and detection unit 15, according
to the invention, consisting of a source for irradiating a luminous radiation "T",
and a sensor 7 for receiving the reflected radiation "r", which are respectively oriented
with an angle (alfa) and an angle (beta) with respect to the sliding surface 2 of
the coin 3.
[0024] Preferably, the unit 15 is a CIS (Contact Image Sensor) module consisting of a linear
array of elementary MOS image sensors, preferably with a density in the range of 200-400
dpi, which defines the sensors 7 and respective detection pixels 8, and of an array
of LEDs 6 which make up the light source 4.
[0025] In operation, the coins 3 are fed to the sliding surface 2 along which they meet
the reading region 5.
[0026] In the absence of coins within the region 5, the sensor 7 is fully dimmed, whereas,
when the coin starts interferring with the luminous radiation emitted by the source
4, the illuminated face of the coin reflects the light and irradiates a number of
pixels 8 of sensor 7 corresponding to the portion covered by the sensor.
[0027] In this stage, the processing unit carries out a repeated acquisition of images of
the illuminated pixels, preferably each one millisecond-reading frequency.
[0028] Upon completion of transit of the coin, the processing unit 9 will have acquired
a plurality of signals among which a signal corresponding to the highest number M
of pixels illuminated from the point of maximun dimensional extension of the coin,
coinciding with the diameter, and with wich the diameter of the just passed coin 3
can be associated.
[0029] As above mentioned, in the case shown in Fig. 1, there is obtained a partial reading
of the diameter to which the deviation value "d" must be added, whereas in case of
Fig. 2, there is acquired a complete reading of the coin's diameter, the technique
of signal acquisition being the same in both cases.
[0030] The above described invention brings about consideable advantages, in particular,
the reliability of the obtained readings, the compactness of the reading device and
the versatility of its use in different applications either as coin-counter and classifier
or token dispensers (in particular in the case of Fig. 2), that is, as machines with
also non-guided insertion of coins to be classified for the verification of their
amount.
[0031] The invention thus conceived is clearly suited for industrial application; it can
however be subjected to several modifications and changes all falling within the scope
of the inventive idea; moreover, all the details may be replaced by technically equivalent
elements.
1. Coins-classifier and counter, comprising:
- a flat slide path (2) for one or more coins to be counted and classified on the
base at least of their diameter;
- a light source (4) for illuminating at least one region (5) of said path;
- a linear optical sensor (7) comprising a plurality of detection pixels (8) located
along said path transversally to a direction of transit of the coins, the sensor being
normally under dim conditions and positioned so as to receive a luminous radiation
(r) reflected by a face of a transiting coin illuminated by a radiation (T) emitted
by said light source;
- a processing unit (9) connected to the sensor (7) in order to acquire at least one
signal corresponding to the number of pixels of sensor (7) which are illuminated for
the reflection of the coin in transit and to univocally associate a number of illuminated
pixels with a diameter of the coin.
2. Device according to claim 1, wherein said processing unit carries out consecutive
acquisitions as the coin moves on and associates the signal, corresponding to the
acquisition of the maximum number of illuminated pixels, with the diameter of the
coin in transit.
3. Device according to claim 1 or 2, wherein said illumination region is a path's transparent
window and said sensor is disposed on the window's side opposite to the side of transit
of the coin.
4. Device according to any of the preceding claims, wherein said light source irradiates
said illumination region with an angle (alfa) to the sliding plane of the coins, and
said sensor is so disposed as to receive a reflected radiation at an angle (beta)
from the illuminated face of the coin.
5. Device according to claim 4, wherein said light source and said sensor make up an
illumination and detection unit (15).
6. Device according to any of the preceding claims, wherein said sensor is a module consisting
of an array of elementary linear MOS-image sensors.
7. Device according to any of the preceding claims, wherein said light source is an array
of LEDs (6).
8. Device according to any of the preceding claims, wherein said coin slides by abutting
against a side guide (11) longidutinally of said path, and said sensor detects a light
reflected by a fraction of the diameter of the illuminated coin.
9. Device according to any of claims 1-7, wherein said sensor detects a light reflected
by the whole diameter of the illuminated coin.
10. Method for classifying and counting coins, comprising the steps of:
- illuminating a face of the coin;
- detecting a light reflected by said coin transiting across an illumination region
by means of a sensor which is normally non-illuminated;
- associating a measure of said reflected light being detected with a dimension of
the coin.
11. Method according to claim 10, wherein said detection comprises a succession of acquisitions
made during the transit of the coin, and said association is established between the
acquisition of the maximum measure of reflected light and the dimension of the coin.