GB2224569A

GB2224569A - Sheet discriminating apparatus

Info

Publication number: GB2224569A
Application number: GB8918396A
Authority: GB
Inventors: Shigetoshi Imai; Yasuhiko Matoba
Original assignee: Laurel Bank Machine Co Ltd
Current assignee: Laurel Bank Machine Co Ltd
Priority date: 1988-08-12
Filing date: 1989-08-11
Publication date: 1990-05-09
Anticipated expiration: 2009-08-11
Also published as: DE3926491A1; GB2224569B; JPH02147546A; DE3926491C2; GB8918396D0; JP2736808B2

Description

0 1 2224569 SHEET DISCRIMINATING APPARATUS The present invention relates

to a sheet discriminating apparatus, for example, to such an apparatus for discriminating whether or not a sheet is of a specified kind and/or whether or not abnormal feed such as double feed occurs, by exposing the sheet to light and detecting the amount of light transmitted through the sheet.

Japanese Utility Model Publication No.

53(1978)-28478 proposes an apparatus which is provided with two photosensors each consisting of a light emitting element and a light receiving element disposed along a transporting path of sheets, detects light transmitted through the sheet by the photosensor disposed upstream, after the photosensor disposed downstream detects the leading edge of the sheet, and discriminates whether or not the sheet is of a specified kind and whether or not abnormal feed such as double feed occurs.

In this apparatus, the downstream photosensor detects the position of the sheet from which the detection of light transmitted through the sheet should be started and discrimination is made as to whether or not the sheet is a specified kind and whether or not abnormal feed occurs by detecting light transmitted through the sheet by the upstream photosensor.

However, since the distance between the photosensors is fixed in this apparatus, detection of transmitted light for discriminating a sheet is always started from the same position of the sheet regardless of the kind of the sheet. Therefore, in the case where the photosensors are arranged so that a specified kind of sheet can be discriminated from others with high accuracy, it is extremely difficult to discriminate other kinds of sheets with sufficient accuracy.

The invention provides a sheet discriminating apparatus comprising light emitting means for emitting light onto a sheet being transported, light receiving means for detecting the amount of light transmitted through the sheet and sheet discriminating means for discriminating a specified kind of the sheet from others and/or abnormal feed or sheets based upon the amount of light transmitted through the sheet detected by the light receiving means, the sheet discriminating means comprising average value calculating and storing means for calculating and storing the average value of the amount of light transmitted through the sheet detected by the light receiving means at a predetermined time interval, reference data calculating and storing means for calculating and storing a reference data based upon the average value of the amount of light transmitted through a sheet preceding the sheet to be discriminated and stored in the average value calculating and storing means, and average data comparing means for comparing the average value of the amount of light transmitted through the sheet calculated in the average value calculating and storing means with the reference data calculated by the reference data calculating and storing means and discriminating the specified kind of sheet from others and/or abnormal feed.

The sheet discriminating means may further include summation value calculating and storing means for calculating and storing a summation value by summing the average values calculated by and stored in the average value calculating and storing means over the entire area of the sheet, reference summation value calculating and storing means for calculating and storing a reference summation data based upon the summation value of the amount of light transmitted through the sheet preceding the sheet to be discriminated and stored in the summation value calculating and storing means, and summation value comparing means for comparing the summation value calculated by the summation value calculating and storing means with the reference summation value calculated by the reference summation value calculating and storing means and discriminating the specified kind of the sheet from others and/or abnormal feed of sheets.

Further, the sheet discriminating means may further include length calculating and storing means for calculating and storing the length of the sheet based upon the amount of light transmitted through the sheet detected by the light receiving means, reference length data calculating and storing means for calculating and storing a reference length data based upon the length of the sheet preceding the sheet to be discriminated and stored in the length calculating and storing means, and length data comparing means for comparing the length of the sheet calculated by the length calculating and storing means with the reference length data calculated by the reference length data calculating and storing means and discriminating the specified kind of the sheet from others and/or abnormal feed of sheets.

In the accompanying drawings, Figure 1 is a schematic drawing showing a left side view of the internal mechanism of a ballot issuing machine having a ballot discriminating 5 apparatus; Figure 2 is a schematic drawing showing, a plan view of an example of a ballot to be issued by a ballot issuing machine having a ballot discriminating apparatus; Figure 3 is a schematic drawing showing a cross-sectional view of second transporting rollers; Figure 4 is a block diagram of a ballot discriminating apparatus; and Figure 5 is a block diagram of an abnormality detecting means.

Referring to Figure 1, a ballot issuing machine 1 having a ballot discriminating apparatus is provided with an upper cover 3 able to be opened upwardly about a hinge 2 provided on the front face of the machine 1 and a lock mechanism 4 at the rear face of the machine 1 for engaging the upper cover 3 with the machine 1. Further, a ballot storing section 5 is provided at a rear portion in the machine 1 for storing ballots.

The ballot storing section 5 comprises a holding plate - 5a inclined forwardly and downwardly for holding the ballots on the upper face thereof, a pair of side plates 5b disposed at opposite sides of the holding plates 5a, a lifting mechanism 5c for lifting a front end of the holding plate 5a each time a 1 1 1 1 ballot is issued, and a guide 5d for guiding the front end of the holding plate 5a while the front end of the holding plate is lifted.

Figure 2 shows an example of the ballot S and the 1 9 is ballots S are held on the holding plate 5a in the ballot storing section 5 so that the printed side thereof faces upwardly.

A take-out roller 6 is provided at an upper and front portion of the ballot storing section 5 and a part of a circumference of the take-out roller 6 is formed with a f riction section 6a. The ballots S are fed out one by one from the ballot storing section 5 to a transporting path 7 by frictional force produced between the friction section 6a and an upper f ace of the uppermost ballot S held by the upper face of the holding plate 5a. The transpo rting path 7 is arranged so as to be inclined forwardly and upwardly.

In the vicinity of the take-out roller 6 in the transporting path 7, there is provided a f irst photosensor 8 consisting of a light emitting element 8a and a light receiving element 8b which receives light emitted f rom the light emitted element 8a and transmitted through the ballot S being taken out by the take-out roller 6.

Downstream of the f irst sensor 8 in the transporting path 7, a pair of first transporting rollers 9, 10, facing each other across the transporting path 7, and a pair of second rollers 11, 12, facing each other across the transporting path 7, are provided. The first transporting roller 9 and the second transporting roller 11, which are disposed above the transporting path 7, are biased downwardly by a plate- like spring 14 supported by a shaft 13 so as to press the first transporting roller 10 and the second transporting roller 12 respectively.

1 I# As shown in Figure 3, the circumference of the second transporting roller 11 is formed in such a manner that a central portion thereof projects and, on the other hand, the circumference of the second transporting roller 12 is formed with an annular groove 12a at a central portion thereof. As a result, the ballot S is f ormed with a crease by being transported by the second transporting rollers 11, 12.

Between the pair of first rollers 9, 10 and the pair of second rollers 11, 12 in the transporting path 7, there is provided a switching fork 16 rotatable about a shaft 15 by a solenoid (not shown) and in cases where the first sensor 8 detects a ballot S erroneously printed or such abnormal feed of ballots S that the ballots S are not taken out one by one by the take-out roller 6, the solenoid is driven so that the switching fork 16 projects above the transporting path 7 to collect the ballots S to a collecting passage 17.

The circumferential speed of the first rollers 9, 10 and the second rollers 11, 12 are determined greater than that of the take-out roller 6 and the ballots S taken out from the ballot storing section 5 by the friction section 6a of the take-out roller 6 are transported by the first transporting rollers 9, 10 and the second transporting rollers 11, 12 so that their transporting speed is accelerated. The ballot S is fed by one rotation of the take-out roller 6 to such a position that a part thereof projects from a ballot issuing opening 18 to the outside so as to be removable.

Downstream of the second transporting rollers 11, 12 in the transporting path 7, there is provided a second sensor 19 consisting of a light emitting element 19a and a light receiving element 19b. The second sensor 19 is disposed at such a position that light emitted from the light emitting element 19a is interrupted by the ballot S when the ballot S stands still as a result of one rotation of the take-out roller 6 so that a part thereof projects from the ballot issuing opening 18 to the outside. Therefore, it is possible to detect whether or not the ballot S has been removed from the ballot issuing machine 1 by having the light receiving element 19b detect the amount of light emitted from the light emitting element 19a and transmitted through the ballot S.

The take-out roller 6 is coaxially and integrally formed with a pulley 20 and an endless belt 26 is engaged with the pulley 20, a drive pulley 23 integrally formed on an output shaft 22 of a drive motor 21, a pulley 24 and a pulley 25 coaxially formed on the first roller 10. A pulley 27 and a pulley 28 are coaxially and integrally formed on the first roller 10 and the second roller 12 respectively. An endless belt 30 is engaged with the pulley 27, the pulley 28, and a pulley 29 coaxially and integrally formed on the pulley 24.

Further, there is provided a transporting path cover 31 for covering the transporting path 7 downstream of the take-out roller 6 so that the transporting path 7 can be exposed to the outside by opening the upper cover 3 and A 9 pulling a handle 32 of the transporting path cover 31. The transporting cover 31 is normally held at a predetermined position by an engaging member 33.

Although not shown in Figure 1, separate keys for use by male and female voters are provided' on an operation panel on the outer face of the ballot issuing machine 1.

Figure 4 is a block diagram of the ballot discriminating apparatus which comprises a key 40a for male voters, a key 40b for female voters, a counter 41 for counting the total number of issued ballots S, the total number of issued ballots S for male voters and the total number of issued ballots S for female voters, drive motor control means 42 for controlling the drive motor 21, abnormality detecting means 43 for detecting based upon a detection signal representing the amount of light emitted through a ballot S detected by the first sensor 8 whether or not aballot S is normal and whether or not a ballot S is being normally fed, and display means 44 for displaying, based upon an output signal from the key 40a or 40b, information that one of the keys 40a, 40b has been pushed, based upon an output signal from the counter 41, the total number of issued ballots S, the total number of issued ballots S for male voters and the total number of issued ballots S for female voters, based upon an output signal from the abnormality detecting means 43, in- formation that an abnormal situation has occurred.

The output signal from the abnormality detecting means 43 is input -the solenoid 45 for driving the switching fork 16 and the counter 41 increases the total number of issued ballots S and the total number of issued ballots S for male or female voters by one when the second sensor 19 detects that a ballot S has been removed and a issue signal is input from the second sensor 19 thereto.

Figure 5 is a block diagram of the abnormality detecting means 43.

Referring to Figure 5, the abnormality detecting means 43 comprises detected data storing means 50 for reading out and storing the amount of light transmitted through the ballot S and detected by the f irst sensor 8 at a predetermined time intervals, average data calculating and storing means 51 for calculating average data Dn,i by averaging the detected data stored in the detected data storing means 50 for each of sections S1 to S10 shown in Figure 2 and storing them, wherein n is the number of issued ballot S, i specifies which section among the sections S1 to S10 the average data is for and is an integer not less than 1 and not larger than 10, and reference data calculating and storing means 52 for calculating, based upon the average data Dn,i calculated by the average data calculating and storing means 51, reference data Drni, reference maximum light transmittance data Dmax j and reference minimum light transmittance data n,i Dminn,i in accordance with the following formulas and storing them.

1 D-rk,i (Drk-l,i + Dk,i)/2 wherein k is an integer greater than 2 and Drl, i = D1,i, Dmaxn,i Drn,i + Drn,i/a Dminn,i Drn,i - Drn,i/b wherein a and b are parameters experimentally determined.

The abnormality detecting means 43 further includes average data comparing means 53 for comparing the average data Dk,i with the reference maximum light transmittance data Dmaxk-1,i and the reference minimum light transmittance data Dmink-1,i for each of the sections S1 to S10 based upon the average data Dn,i calculated by the average data calculating and_ storing means 51, the reference maximum light transmittance data Dmaxn,i and the reference minimum light transmittance data Dminn,i calculated by the reference data calculating and storing means 52. In the case where Dk,i is greater than Dmaxk-1,ir since the amount of light transmitted trough the ballot S is too large and it is considered that the ballot S is not printed or erroneously printed, the average data comparing means 53 outputs an abnormal signal to a timing means 54. On the other hand, in the case where Dk,i is less than Dmink-1, i, since the amount of light transmitted trough the ballot S is too small and it is considered that double feed of ballots S occurs or two or more ballots S are being fed, while they partially overlap, the average data comparing means 53 outputs an abnormal signal to the timing means 54. On the contrary, in the case where Dk,i is not less than Dmink-1,i and not greater than i is Dmaxk-l,ir since it is considered that the ballot S is normal and that the ballot S is being fed normally, the average data comparing means 54 outputs no abnormal signal.

Moreover, the abnormality detecting means 43 further includes summation data calculating and storing.means 55 for calculating summation data ADn by summing the average valug Dn,i of all sections S1 to S10 of the ballot S and reference summation data calculating and storing means 56 for calculating, based upon the summation data ADn calculated by the summation data calculating and storing means 55, reference summation data ADrn, reference summation maximum light transmittance data ADmaxn and reference summation minimum light transmittance data ADminn in accordance with the following formulas and storing them.

AD-rk =-- (AD-rk-1 + ADO/2 wherein ADr, = AD,, ADmaxn = ADrn + ADrn/c ADminn = ADrn - ADrn/d wherein c and d are parameters determined experimentally.

The abnormality detecting means further includes summation data comparing means 57 for comparing the summation data ADk with the reference summation maximum light transmittance data ADmaxk-, and the reference summation minimum light transmittance data ADmink-1 for each ballot S. In the case where the summation data comparing means 57 judges that ADk is greater than ADmaxk-11 since the amount of light transmitted the ballot S is too large and it is considered that the ballot S is not printed or erroneously printed, the i is summation data comparing means 57 outputs an abnormal signal to a timing means 54. On the other hand, in the case where ADk is less than ADmink-11 since the amount of light transmitted through the ballot S is too small and it is considered that double feed of ballots S occurs or two or more ballots are being fed in a partially overlapped condition, the summation data comparing means 57 outputs an abnormal signal to the timing means 54. On the contrary, in the case where ADk is not less than ADmink-1 and not greater than ADmaxk-lr since it is considered that the ballot S is normal and that the ballot S is being fed normally, the summation data comparing means 57 outputs no abnormal signal.

Furthermore, the abnormality detecting means 43 further includes length data calculating and storing means 58 for calculating length data Ln of the ballot S based upon an output signal from the first sensor 8 and storing them and reference length data calculating and storing means 59 for calculating, based upon the length data Ln, reference length data Lrn, reference maximum length data Lrmaxn and reference minimum length data Lrminn in accordance with the following formulas.

Lrk = (Lrk-, + Lk)/2 wherein Lrl = L1, Lrmaxn = Lrn + Lrn/e Lrminn = Lrn Lrn/f wherein e and f are parameters determined experimentally.

Moreover, the abnormality detecting means 43 further includes length data comparing means 60 for comparing the length data Lk with the reference maximum length data Lrmaxk-1 and the reference minimum length data Lrmink-l In the case where Lk is greater than Lrmaxk-lr since the detected length of ballot S is too great and it is considered that two or more ballot s S are being f ed, while they par7 tially overlap, the length data comparing means 60 outputs an abnormal signal to the timing means 54. On the other hand, in the case where the length data comparing means 60 judges that Lk is less than Lrmink-lr since the detected length of the ballot S is too small and it is considered that the ballot S is cut of f or f olded, the length data comparing means 60 outputs an abnormal signal to the timing means 54. On the contrary, in the case where Lk is not less than Lrmink-1 and not greater than Lrmaxk-1, since it is considered that the ballot S is normal and that the ballot S is being fed normally, the length data comparing means 60 outputs no abnormal signal.

As described above, when at least one of the average data comparing means 53, the summation data comparing means 57 and the length data comparing means 60 detects that the ballot S is abnormal or that the ballot S is being f ed abnormally, the abnormal signal is output to the timing means 54.

When the timing means '54 receives the abnormal signal before a predetermined time has passed from the start of the operation for taking out the ballot S, the timing means 54 outputs a ballot collecting signal to the solenoid 45. As a 1 result, the switching fork 16 is driven, whereby the ballot S is collected into the collecting passage 17. Simultaneously, the timing means 54 outputs a take-out signal to the drive motor control means 42 to enable the drive motor 21 to rotate the take-out roller 6 again and a new ballot S is taken out. On the other hand, when the timing means 54 receives the abnormal signal after the predetermined time period has passed from the start of the operation for taking out the ballot S, the timing means 54 outputs a drive prohibition signal to the drive motor control means 42, a count prohibition signal to the counter 41 and an abnormality display signal to the display means 44, respectively. As a result, the drive motor 21 is stopped and the display means 44 displays information that some abnormal situation has occurred. When the counter 41 receives the count prohibition signal, it does not increase the total number of issued ballots S and the total number of the issued ballots for male voters or the total number of issued ballots S for female voters, even if the issue signal is input from the second senor 19.

In the thus constituted ballot issuing machine 1 having the ballot discriminating apparatus, the operation for issuing ballots S is started when an operator pushes the key 40a for male voters or the key 40b for female voters. Then, the start signal is input to the drive motor control means 42, thereby to drive the drive motor 21 and a display signal is input to the display means 44, thereby to enable the display means 44 to display information that a male or female voter was specified by the operator. Simultaneously, a count signal is output to the counter 41 but, as described above, the counter 41 does not count until the.issue signal is input from the second sensor 19.

Thus, when the drive motor 21 is driven, the drive pulley 23 is rotated clockwise in Figure 1. Accordingly, the endless belt 26 engaged with the drive pulley 23, the pulley 25 and the pulley 20 are rotated clockwise, while the pulley 24 is rotated counterclockwise. As a result, the takeout roller 6 formed coaxially and integrally with the pulley 20 is rotated clockwise and the friction section 6a of the take-out roller 6 comes into contact with an upper face of the uppermost ballot S of the ballots S held on the upper face of the holding plate 5a, whereby the uppermost ballot S is fed out to the transporting path 7 by frictional force produced between the friction section 6a and the upper face of the uppermost ballot S.

On the other hand, in accordance with the counterclockwise rotation of the pulley 24, the pulley 29 formed coaxially and integrally with the pulley 24 is rotated counterclockwise in Figure 1, whereby the endless belt 30 engaged with the pulley 29, the pulley 27 and the pulley 28 are rotated counterclockwise. As a result, the first transporting roller 10 formed coaxially and integrally with the pulley 27 and the second roller 12 formed coaxially and integrally with the pulley 28 are rotated counterclockwise 1 k 1 -17and the first roller 9 and the second roller 11 which are biased against the first roller 10 and the second roller 12 respectively by the plate-like spring 14 are rotated clockwise.

When the ballot S taken out by the take out roller 6 from the ballot storing section 5 passes through the firs t sensor 8, the amount of light emitted from the light emitting element 8a and transmitted through the ballot S is detected by the light receiving element 8b and the transmitted light amount detection signal is fed to the abnormality detecting means 43. The ballot S is further fed to the ballot issuing opening 18 along the transporting path 7, while the speed thereof is accelerated by the first transporting rollers 9, 10 and the second transporting rollers 11, 12.

As described above, the average data comparing means 53, the summation data comparing means 57 and the length data comparing means 60 of the abnormality detecting means 43 respectively discriminate whether or not the ballot S is abnormal and whether or not the ballot S is abnormally fed and if they judge that some abnormal situation has occurred, they output the abnormal signal to the timing means 54. When the timing means 54 receives the abnormal signal before a predetermined time has passed from the start of the operation for taking out the ballot S! the timing means 54 outputs a ballot collecting signal to the solenoid 45. As a result, the switching fork 16 is driven, whereby the ballot 1 i S is collected into the collecting passage 17. Simultaneously, the timing means 54 outputs a take-out signal to the drive motor control means 42 to enable the drive motor 21 to rotate the take-out roller 6 again and a new ballot S is taken out. On the contrary, when the timing -means 54 receives the abnormal signal after the predetermined time period has passed from the start of the operation for taking out the ballot S, since the ballot has been fed to a position just before the switching fork 16 or has passed beyond the switching fork 16, it is impossible to collect the ballot S into the collecting passage 17 by driving the switching fork 16. Therefore, the timing means 54 outputs a drive prohibition signal to the drive motor control means 42 to stop the driving motor 21, thereby to stop the rotation of the take-out roller 6, the first transporting rollers 9, 10 and the second transporting rollers 11, 12. Then, in the case where the ballot S projects from the ballot issuing opening 18 to the outside, the ballot S is removed from the ballot issuing opening 18 to be collected. On the other hand, in the case where the ballot S remains in the ballot issuing machine 1, the lock mechanism 4 is released to open the upper cover 3 and the ballot S is removed and collected by lifting the handle 32 and opening the transporting path cover 31. Simultaneously with outputting the drive prohibition signal to the drive motor control means 42, the timing means 54 outputs the abnormality display signal to the display means 44, thereby to enable the display means 44 to display information that some abnormal situation has occur- 1 red and also outputs the count prohibition signal to the counter 41. As described above, the counter 41 increases the total number of issued ballots S and the total number of the issued ballots S for male voters or that for female voters by one, when the second sensor 19 detects that the ballot S has been removed and outputs the issue signal to the counter 41. However, in the case where the count prohibition signal has been input from the timing means 54, since the ballot removed from the ballot issuing opening 18 will be collected, even if the issue signal is input from the second sensor 19, the counter 41 does not count.

On the contrary, in the case where the abnormality detecting means 43 judges that the ballot S is normal and that the ballot S is being fed normally, the ballot S is fed to the ballot issuing opening 18, while the ballot S is formed with a crease at the central portion with respect to the longitudinal direction thereof. The drive motor 21 is controlled in such a manner that it stops at the time when the take-out roller rotates by one revolution and the ballot transporting mechanism is designed so that when the drive motor 21 stops, the ballot S partially projects to the outside from the ballot issuing opening 18 so as to be removable from the outside of the ballot issuing machine 1 and a part thereof can be positioned between the light emitting element 19a and the light receiving element 19b of the second sensor 19.

Afterward, when the ballot S is removed from the ballot issuing opening 18, since no ballot S is present between the light emitting element 19a and the light receiving element 19b of the second sensor 19, the second sensor 19 detects that the ballot S has been removed and outputs the issue signal to the counter 41 -and a reset signal to the drive motor control means 42.

When the counter 41 receives the issue signal from the second sensor 19, unless it has received the count prohibition signal from the abnormality detecting means 43, it increases the total number of issued ballots S and that for male voters or that for female voters in accordance with the count signal input from the key 40a or 40b, and outputs an issued ballot number signal to the display means 44, thereby to enable the display means 44 to change the number of issued ballots S displayed thereon. The count signal can be amended before the issue signal is input from the second sensor 19 and, therefore, even if the operator pushed the wrong key 40a or 40b, if the operator pushes the right key 40a or 40b before the ballot Sis removed, the total number of issued ballots S for male voters or that for female voters can be correctly counted.

Further, the drive motor control means 42 is constituted in such a manner that it does not drive the drive motor 21 before the reset signal is input from the second sensor 19 and, therefore, even in the case where, after the drive motor 21 has rotated the take-out roller 6 by one revolution to feed the ballot S to a predetermined position and was stopped and before the ballot S is removed from the 1 1 k ballot issuing opening 18, the operator comes to realize that the wrong key 40a or 40b was pushed and pushes the right key 40a or 40b, since the drive motor 21 is not driven, a new ballot S is prevented from being taken out from the ballot storing section 5, without fail.

As described in detail above, since abnormality of the ballot S and abnormal feed of the ballot S are discriminated based upon the average amount of light transmitted through each of the sections S1 to S10 of the preceding ballot S, the summation value of the average amount of the light transmitted through each of the sections S1 to S10 of the preceding ballot S and the length of the preceding ballot S, in the case where the kind of the ballot S is changed, it is possible to discriminate whether or not the ballot S is abnormal and whether or not the ballot S is being abnormally fed with high accuracy and without any modification of the ballot issuing machine 1 itself.

As described in detail above, it is possible to provide a sheet discriminating apparatus capable of discriminating whether or not sheets are of a specified kind and/or whether or not abnormal feed of sheets such as double feed occurs for various kinds of sheets.

In the above description, although an amount of light transmitted through the ballot S is detected for each of the sections S1 to S10, the number of the sections may be greater than 10 or less than 10.

Further, in the above description, although when the timing means 54 receives the abnormal signal

1 before the predetermined time period has passed, it turns the solenoid 45 on and the ballot S is collected into the collecting passage 17 by the switching fork 16, while when the timing means 54 receives the abnormal signal after the predetermined time period has passed, the drive motor 21 is stopped by the drive motor control means 42 and the ballot S is removed and collected from the transporting path 7 by opening the upper cover 3 and the transporting path cover 31 or from the ballot issuing opening 18, it is possible to collect the ballot S without the timing means in such a manner that, for example, the abnormal signal from the average data comparing means 53 is input to the solenoid 45 and the ballot S is collected into the collecting passage 17 by the switching fork 16, while the abnormal signal from the summation data comparing means 57 or the length data comparing means 60 is input to the drive motor control means 42, thereby to stop the drive motor 21 and collect the ballot S. Moreover, if the first sensor 8 and the switching fork 16 can be arranged such that the distance between them is sufficiently long, it is possible to output all of the abnormal signals from the average data comparing means 53, the summation data comparing means 57 and the length data comparing means 60 to the solenoid 45, thereby to collect the ballot S by the switching fork 16 without the timing means 54.

1

Claims

A sheet discriminating apparatus comprising light emitting means for emitting light onto a sheet being transported, light receiving means for detecting an amount of light transmitted through the sheet and sheet discriminating means. for discriminating a specified kind of the sheet from others and/or abnormal feed of sheets based upon the amount of light transmitted through the sheet detected by the light receiving means, the sheet discriminating means comprising average value calculating and storing means for calculating and storing an average value of the amount of light transmitted through the sheet detected by the light receiving means at a predetermined time interval, reference data calculating and storing means for calculating and storing a reference data based upon the average value of the amount of light transmitted through a sheet preceding the sheet to be discriminated and stored in the average value calculating and storing means, and average data comparing means for comparing the average value of the amount of light transmitted through the sheet calculated in the average value calculating and storing means with the reference data calculated by the reference data calculating and storing means and discriminating the specified kind of sheet from others and/or abnormal feed.
2. A sheet discriminating apparatus as claimed in claim 1, wherein the sheet discriminatingmeans further includes summation value calculating and storing means for calculating and storing a summation value by summing the average values calculated by and stored in the average value calculating and storing 1 means over the entire area of the sheet, reference summation value calculating and storing means for calculating and storing a reference summation data based upon the summation value of the amount of light transmitted through the sheet preceding the sheet to be discriminated and stored in the summation value calculating and storing means, and summation, value comparing means for comparing the summation value calculated by the summation value calculating and storing means with the reference summation value calculated by the reference summation value calculating and storing means and discriminating the specified kind of the sheet from others and/or abnormal feed of sheets.
3. A sheet discriminating apparatus as claimed in Claim 1 or 2, wherein the sheet discriminating means further includes length calculating and storing means for calculating and storing a length of the sheet based upon the amount of light transmitted through the sheet detected by the light receiving means, reference length data calculating and storing means for calculating and storing a reference length data based upon the length of the sheet preceding the sheet to be discriminated and stored in the length calculating and storing means, and length data comparing means for comparing the length of the sheet calculated by the length calculating and storing means with the reference length data calculated by the reference length data calculating and storing means and discriminating the specified kind of the sheet from others and/or abnormal feed of sheets.
4. A sheet discriminating apparatus substantially as herein described with reference to and as shown in the accompanying drawings.

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