Flat-article sorting apparatus for an automatic mail handling system and the like

Abstract

A flat-article sorting apparatus for automatic mail handling systems and the like is provided in which the mail sorting pockets are divided into a plurality of groups. Each flat-article or article of mail is provided with coded data which is detected by a character recognition circuit and converted to a binary code. The binary code is divided into two codes, one corresponding to the group into which the flat-article is to be sorted and the other corresponding to the pocket within the group. The flat-articles are conveyed along a branching transport path provided with photoelectric detectors which detect the leading edge of the articles. The photoelectric detectors are connected to pulse circuits for generating shift pulses which cause the data detected by the character reader to be shifted in a plurality of parallel shift registers in synchronism with the movement of the articles in the transport path. Code detectors are connected to the shift registers and responsive to particular binary codes to actuate deflecting mechanisms to divert the articles first, into the appropriate group according to the first code, and then into the appropriate pocket according to the second code. Monitoring and alarm circuitry are provided to detect erroneous operation of the apparatus.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a flat-article sorting apparatus for use in an automatic mail-handling system and the like.

DESCRIPTION OF THE PRIOR ART

In a conventional automatic mail sorting apparatus, the data identifying the flat articles such as cards, envelopes and postcards are transferred in synchronism with the movement of the flat articles, so that they are diverted to the individual sorting pockets in response to the data. For this purpose, a great number of photoelectric devices are provided for detecting the movement of the flat articles, so as to shift the data stored in the register in response thereto, and thereby to synchronize the data transfer with the movement of the flat articles.

In the practical sorting apparatus now in use, however, the sorting pockets often number more than 100, requiring an equal number of lamp-photodetector pairs (light bars) and shift registers to be provided on the one-to-one correspondence basis. This makes the system as a whole more expensive and its maintenance difficult and more costly.

SUMMARY OF THE INVENTION

It is, therefore, an object of this invention to provide an improved flat-article sorting apparatus requiring a smaller number of light bars and registers.

According to this invention, there is provided a flat-article sorting apparatus in which the sorting pockets are divided into a plurality of groups, so that the corresponding pockets belonging to mutually different groups are represented by a common pocket selection code and given one register provided in common thereto, and so that the pocket selection data are shifted in response to the pulses obtained at light bars.

BRIEF DESCRIPTION OF THE DRAWINGS

The features and advantages of this invention will be understood from the following detailed description of a preferred embodiment of this invention taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic view of an embodiment of this invention;

FIG. 2 is a perspective view of the reader section of the embodiment;

FIGS. 3a and 3b are plan and side views of the divider of the embodiment;

FIGS. 4 and 5 are a plan view and a side view of the sorting pocket of the embodiment, respectively.

FIGS. 6a, 6b and 6c are block diagram of the embodiment; and

FIG. 7 is a table showing the relationship between the pocket number and the pocket selection code.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1, the preferred embodiment of this invention comprises a feeder section 1, a reader section 2, a transport-direction converter section 3 and a sorter section 4. In the sorter section 4, one-hundred and twenty eight pockets are disposed in four stages, each of which comprises thirty two pockets. The feeder section 1 comprises a hopper 5, an endless conveyor belt 6, and a suction chamber 7. The conveyor belt 6 has several pairs of suction apertures at regular intervals longitudinally. The suction chamber 7 is connected through a pipe to a suction pump. The surface 8 of the suction chamber 7 kept in contact with the conveyor belt 6 is provided with suction apertures longitudinally aligned and similar to those of the conveyor belt 6. The articles of mail 9 contained in the hopper 5 are fed by the belt 6 through a transport path 10 to the reader section 2 one by one. A postal code number on each article of mail 9 is read out while it is passing through the reader section 2. Then, each article of mail is turned by 90.degree. at the transport-direction converter section 3 and fed to the sorter section 4.

The reader section 2 comprises, as shown in FIG. 2, two pairs of dual belts 19-19' and 20-20' and pulleys 35, 36, 37 and 38 for supporting the belts 19-19' and 20-20'. A flying spot scanner 17 and a photoelectric device 18 are disposed on the side of the transport path, i.e., on the side of the article of mail where postal code number 21 is written. A housing 16 is disposed to cover the flying spot scanner 17 and the photoelectric device 18 for the purpose of precluding the influence of external light.

The flying spot scanner scans the area of postal code number on the article of mail 9 by a small spot of light while the article of mail is being transported. As a result, the code number 21 is detected by photoelectric device 18. The detected signal is transmitted to a chracter recoginition circuit 76 (FIG. 6a) in which the three-digit postal code is recognized. Thus, after the scanning, the code number is recognized with respect to three-digit character. As a result, one of 1,000 kinds of numerals, 000 to 999 is read out for each article of mail. In this embodiment, the sorter section 4 comprises 128 pockets, numbered 0 to 127, which correspond not to the individual postal code numbers, but to groups of specific postal code numbers, depending on the amount of actual postal traffic and delivery system of each postal service block. This makes it possible to reduce the number of pockets and the cost of the apparatus as a whole. For this purpose, the detected decimal three-digit postal number is converted to one of the pocket numbers 0 to 127 in accordance with the predetermined order. The articles of mail for which the pocket number has been determined in the character recoginition circuit 76 are further transported to the sorter section 4 in which the articles of mail are diverted into one of the branch paths and thence into a specific pocket.

In the sorter section 4, the transport path 10 is branched into a plurality of transport paths A, B, C and D, as shown in FIG. 1. The selection of the individual pockets is achieved by dividers Da, Db, Dc, D.sub.0 . . . . D.sub.126 installed respectively at the branch points in response to the respective pocket number. Each of the deviders Da, Db and Dc comprises, as schematically shown in FIG. 3, a V-shaped movable member 23 disposed in the center of the branch point of the transport path, pulleys 30, 31, 32, 33 and 34, and four pairs of dual conveyor belts 26, 26', 27, 27', 28, 28', 29 and 29'. The movable member 23 is connected through a shaft 24 to a rotary solenoid 25 installed on the back side of the base plate, and moved from position J to K in response to a voltage applied to the rotary solenoid 25. Thus the articles of mail supplied in the direction Z are divided into two groups, one heading toward a straight path 22 and the other toward a branch path 22'. In this embodiment, it is so arranged that an article of mail is selected into a straight path 22 when no voltage is supplied to the solenoid and into a branch path 22' when it is. A roller 39 comprises a pinch roller 40 of an elastic rubber, which is to suitably press the conveyor belts 26 and 26' against the articles of mail at the branch point, thereby enabling the conveyor belts to securely hold each article of mail in turn.

The sorting pockets are serially numbered in the order as shown in FIG. 1. Numbers H.sub.0 to H.sub.31 are assigned to the pockets in sequence from right to left for the lowest transport path A. While, numbers H.sub.32 to H.sub.63 are assigned for the path B, and H.sub.64 to H.sub.95 for the path C. Similarly, H.sub.96 to H.sub.127 are assigned to pockets in the uppermost path D.

As shown in FIGS. 4 and 5, each sorting pocket consists essentially of the divider D and a receiving pocket H. The divider D comprises a movable member 41, a drive shaft 42, a rotary solenoid 43 for driving the movable member 41, a pinch roller 44, dual conveyor belts 47-47' and 48-48', and pulleys 45 and 46 and is identical to the divider shown in FIG. 3 in operation. The receiving pocket H comprises a guide plate 49, a receiving plate 50, and partitions 51 and 52. An article of mail is transported in a straight path when no voltage is supplied to the rotary solenoid, but it is diverted to the corresponding pocket when the rotary solenoid is energized.

The dividers D0 through D126 correspond to the pockets Ho through H126, and the solenoids S0 through S126 to dividers D0 through D126. The last pockets H31, H63, H95 and H127 in the individual stages need not correspond to the dividers and the rotary solenoids.

In this embodiment, the pocket numbers H0 to H127 are converted to 7-bit data as shown in FIG. 7, and electrically stored in 7-bit shift registers. The pocket selection data stored in the register is transferred in accordance with the transportation of the mail matter. The binary codes No. 1, No. 2, No. 4, No. 8 and No. 16 correspond to pocket numbers in the individual transport path stages A,B,C and D, and the binary codes No. 32 and No. 64 are used to discriminate the stages A,B,C and D from each other. For example, a binary number (0110010) designates the (10010)th pocket, i.e., the 19th pocket in the (01)th stage (the stage B). Assuming that the pocket selection code (0110010) is given, the solenoid Sb of the divider Db corresponding to the first two digits (01) is activiated, and then the solenoid S49 of the divider D49 corresponding to the remainder 5 digits (10010) is activiated, whereby a transport path for the article of mail to be guided to the pocket H49 is established.

The functions of the storage registers and their related circuits will be described below with reference to FIGS. 1, 6-a, 6-b and 6-c. The signal detected by photocell device 18 is supplied to the character recognition circuit 76 in which a decimal 3-digit postal code number is decoded. The decoded data is translated into a binary 7-digit pocket selection code, i.e., a pocket number, in a translator 77.

The translator 77 is a code converter matrix such as, for example, a diode matrix. The storage register is constituted of parallel 7-bit multistage shift registers, each consisting of 7 flipflops disposed in parallel with each other. The input is coupled through 7 gates to the register of the previous stage. When a gate pulse (i.e., a shift pulse) is supplied to the 7 gate lines in common, the stored data of 7 lines are renewed according to the output data of the previous stage. The registers disposed in multistage are indicated by R.sub.0, R.sub.1, R.sub.2, . . . . R.sub.n, Q.sub.0, Q.sub.1, . . . . Q.sub.n.

The 7-line output data from translator 77 is supplied to the first stage register R.sub.0. The gate in the register R.sub.0 is always opened and hence register R.sub.0 accepts the data when the pocket selection data is obtained by the translator 77.

After the read-out of the postal code number, an article of mail intercepts the light rays from the light source disposed to face a photoelectric device L.sub.B-b. The interception is detected by the photoelectric device L.sub.B-b which is located so that the instant at which the leading edge of the article of mail is detected is concident with the instant at which the read-out of the postal code number is completed. There is also provided a photoelectric device L.sub.B-a for detecting the leading edge of an article of mail to be passed through the reader section.

When the leading edge of an article of mail is detected by the photoelectric device L.sub.B-b, a short pulse is generated by a differentiator circuit 78 coupled thereto and supplied to a shift pulse input terminal of the register R1 as a shift pulse P1. The data stored in the register R0 is shifted to the register R1 by the shift pulse P1. Immediately after this shifting, a clear pulse CL is supplied to the register R0 in order to reset the register R0. Thus, the register R0 is ready to accept the data on the next succeeding article of mail.

The shift pulse P1 is also supplied to a delay circuit 88, which is constituted of 96-stage shift register. A clock pulse having a repetition period of tc is supplied from a clock pulse generator 86 to the delay circuit 88. The outputs of the 16th, 32nd, 48th, 64th, 80th and 96th stages in the delay circuit 88 are supplied to shift pulse input terminals of the registers R2, R3, R4, R5, R6 and R7, respectively. Therefore, after the lapse of a period of 16tc, a pulse P2 is obtained from the first intermediate output terminal of the delay circuit 88. The pulse P2 is supplied to the register R2 as the shift pulse, whereby the data stored in the register R1 is shifted to the register R2.

Furthermore, after the lapse of another period of 16tc, a pulse P3 is obtained and supplied to the register R3 to shift the data from the register R2 to R3. Thus, the pulses P2, P3, P4, P5, P6 and P7 are successively obtained from intermediate output terminals of the delay circuit 88, and supplied to the registers R2, R3, R4, R5, R6 and R7, respectively, whereby the data stored in the register R1 is shifted in sequence to the registers R2, R3, - - - , R7. In this manner, the pocket selection data of the article of mail is shifted from one register to the following one as the article of mail is transported. A series of shift pulses P1 to P7 are generated at a time interval of tm (=16tc). To obviate operational error, the time interval of tm should be determined in consideration of a pitch of the article of mail or the interval between the leading edges of every two adjacent articles of mail. In practice, the time interval tm is determined slightly shorter than the minimum pitch of the article of mail. Thus, the pocket selection data of each article of mail is shifted from the register R1 to R6 for the time period of 6tm. In each register, the data is stored for the period of tm. Therefore, even if the pitch of two adjacent article of mail is a minimum, the interference between different data representing two adjacent article of mail never occur.

Thus, the pocket selection data of the mail matter is shifted from the register R1 to R7 and stored in the register R7 with a given time delay corresponding to the time period in which an article of mail is transported from the point of L.sub.B-b to the point of L.sub.B-c. In other words, when the article of mail approaches the divider Da, the pocket selection data of the article of mail is in the register R7. Then, the article of mail is detected by a photoelectric device L.sub.B-c. The output of the device L.sub.B-c is supplied to the differentiator circuit 79 to obtain the shift pulse P8. The shift pulse P8 is supplied to the register R8 so as to shift the data stored in the register R7 to the register R8. Two outputs of the No. 32 bit position and the No. 64 bit position of the register R8 are connected to a decoder 80 which generates an output when the two output lines are simultaneously binary 0. The output of the decoder 80 is supplied through an amplifier 81 to the solenoid Sa of the divider Da so as to transfer the mail matter to the lowest stage A. In the case where an article of mail is bound for one of the pockets H0 through H31 in the lowest stage A, both of the No. 32 bit position and No. 64 bit position of the data thereof are binary 0, as shown in FIG. 7. Therefore, the solenoid Sa is energized by the output of the decoder 80, whereby the transport path of the mail matter is directed to the lowest stage A by the divider Da.

For the time interval in which the data stored in the register R1 is shifted to the register R7, an article of mail must be transported from the point L.sub.B-b to the point close to L.sub.B-c, and before the article of mail is detected by the photoelectric device L.sub.B-c, the data thereof must have been shifted to the register R7. If the transport speed is changed, the data can not be transferred in synchronism with the movement of articles of mail. However, the error in the synchronization is absorbed by detecting the leading edge of the articles of mail by the photoelectric device L.sub.B-c and by shifting the data from the register R7 to R8 in response to the detected signal, that is, re-synchronization is effected

The divider Da operates to transport an article of mail to the branch path only when the No. 32 bit position and No. 64 bit position of the data stored in the register R8 are both binary 0. If the next succeeding article of mail is not to be directed to one of the pockets in the stage A, the data stored in the register R8 is renewed, and the data of the next succeeding article of mail stored in the register R7 is shifted to the register R8, when this article of mail is detected by the photoelectric device L.sub.B-c. As a result, the divider Da is reset to transport the article of mail to the straightline path, because at least one of the No. 32 or No. 64 bit positions of the data is a binary digit 1.

The pulse P.sub.8 is also supplied to a delay circuit 89 identical to the circuit 88, and shifted by the clock pulse supplied from the clock pulse generator 87 to provide the shift pulses P.sub.9, P.sub.10 and P.sub.11 for the registers R.sub.9, R.sub.10 and R.sub.11, respectively. The data stored in the register R.sub.8 are shifted to the register R.sub.9, R.sub.9 to R.sub.10, and R.sub.10 to R.sub.11, in response to the shift pulse P.sub.9, P.sub.10 and P.sub.11, respectively. The No. 64 and the No. 32 bit positions of registers R.sub.9 and R.sub.10 are connected to the decoders 82 and 84 which identify the binary code 01 and 10 respectively. The outputs of the decoders 82 and 84 are supplied to the solenoids Sb and Sc of the dividers Db and Dc through the amplifiers 83 and 85, respectively. As shown in FIG. 7, the binary code of the No. 64 and No. 32 bit positions in the data of the articles of mail bound for the second and the third stages B and C are 01 and 10, respectively. Therefore, the solenoids Sb and Sc of the Dividers Db and Dc are energized when the data of the mail matters bound for the stages B and C are shifted to the registers R.sub.9 and R.sub.10, respectively. Thus, the articles of mail are transported to the stages B and C, respectively. The articles of mail bound for the uppermost stage D, the pocket selection data of which has the binary code 11 in the No. 64 and No. 32 bit, are transported to the stage D without branching by the dividers Da, Db and Dc. The distance between the dividers Da and Db or Db and Dc is determined so that it corresponds to the time interval between the shift pulses P.sub.8 and P.sub.9 or P.sub.9 and P.sub.10.

The photoelectric devices L.sub.b-0, L.sub.b-4, L.sub.b-8 and L.sub.b-12 are installed at the front portions of the pockets H.sub.0, H.sub.32, H.sub.64 and H.sub.96, respectively. The respective distances of the photoelectric device L.sub.B-C from the respective pockets H.sub.0, H.sub.32, H.sub.64 and H.sub.96 are equal to each other. When the leading edge of an article of mail is detected by one of the photoelectric devices L.sub.b-0, L.sub.b-4, L.sub.b-8 and L.sub.b-12, the detected signal is supplied to the differentiators circuit 90 through the OR circuit 93 to provide the shift pulse l.sub.0 by which the data stored in the register R.sub.11 is shifted to the register Qo. At this time, re-synchronization is achieved by detecting the leading edge of an article of mail by the photoelectric device L.sub.b-0, L.sub.b-4, L.sub.b-8 or L.sub.b-12, whereby the variation in synchronization can be compensated.

The output of the register Qo is connected to the decoder Mo for detecting the data of the mail matter to be directed to the pockets H.sub.0, H.sub.32, H.sub.64 and H.sub.96 and for generating and supplying an output signal to the respective amplifiers N.sub.0, N.sub.32, N.sub.64 and N.sub.96. The outputs from the amplifiers N.sub.0, N.sub.32, N.sub.64 and N.sub.96 are supplied to the solenoids S.sub.0, S.sub.32, S.sub.64 and S.sub.96 of the dividers D.sub.0, D.sub.32, D.sub.64 and D.sub.96. For example, when the data for the pocket H.sub.0 is stored in the register Q.sub.0, it is detected by the decoder M.sub.0, and the output of the decoder M.sub.0 is supplied through the amplifier N.sub.0 to the solenoid S.sub.0 of the divider D.sub.0 whereby an article of mail is diverted to the pocket H.sub.0. Because the distances of the photoelectric device L.sub.B-C from L.sub.b-0 , L.sub.b-4, L.sub.b-8 and L.sub.b-12 are equal to each other, an article of mail is detected by only one of the photoelectric devices L.sub.b-0, L.sub.b-4, L.sub.b-8 and L.sub.b-12.

The shift pulse l.sub.0 obtained from one of the photoelectric devices L.sub.b-0, L.sub.b-4, L.sub.b-8 and L.sub.b-12 is also supplied to the delay circuit 91 identical to the delay circuit 88, and shifted by the clock pulse from the clock pulse generator 92 to obtain the shift pulses l.sub.1, l.sub.2 - - - l.sub.7 for the registers Q.sub.1, Q.sub.2 - - - Q.sub.7, respectively. The data stored in the register Q.sub.0 is shifted to the register Q.sub.1, Q.sub.1 to Q.sub.2, Q.sub.2 to Q.sub.3 - - - Q.sub.6 to Q.sub.7. During the shifting the data from the register Q.sub.0 to Q.sub.7, the data are examined one after another by the decoder M.sub.1, M.sub.2 - - - M.sub.7 connected to the registers Q.sub.1, Q.sub.2 - - - Q.sub.7, respectively. The detected signal is supplied to the corresponding one of the solenoids S.sub.0 to S.sub. 7, S.sub.32 to S.sub.39, S.sub.64 to S.sub.71 and S.sub.96 to S.sub.103 through the corresponding amplifiers n.sub.O to N.sub.7, N.sub.32 to N.sub.39 , N .sub.64 to N.sub.71 and N.sub.96 to N.sub.103. Thus, the article of mail bound for the first pocket groups in the stages A, B, C and D are diverted to the respective pockets in response to the detected data.

The shifting of the data stored in the register Q7 to Q8 is achieved when the leading edge of an article of mail is detected by one of the photoelectric devices L.sub.b-1, L.sub.b-5, L.sub.b-9 and L.sub.b-13 installed at the front position of the dividers D.sub.8, D.sub.40, D.sub.72 and D.sub.104. The outputs of the photoelectric devices are supplied to the differentiator circuit 95 through the OR circuit 94 to provide the shift pulse l.sub.8, which is supplied to the register Q.sub.8 to shift the data thereto, whereby re-synchronization is achieved. The shift pulse l.sub.8 is also supplied to the delay circuit 96 and shifted by the clock pulse from the clock pulse generator 97. The data in the register Q.sub.8 is automatically shifted to Q.sub.9, Q.sub.10 - - - Q.sub.15 in turn in a similar manner. The articles of mail to be directed to the second pocket group in each stage are diverted to the respective pockets in a similar manner to the articles of mail of first pocket group.

The shifting of the data from the register Q.sub.15 to Q.sub.16 and Q.sub.23 to Q.sub.24 is achieved when the leading edge of an article of mail is detected by one of the photoelectric devices L.sub.b-2, L.sub.b-6, L.sub.b-10 and L.sub.b-14, and L.sub.b-3, L.sub.b-7, L.sub.b-11 and L.sub.b-15. At the same time re-synchronization for the second and third pocket groups is achieved. The shifting of the data from the register Q.sub.16 to Q.sub.23, and Q.sub.24 to Q.sub.30 is automatically achieved in a similar manner.

The photoelectric devices L.sub.b-16, L.sub.b-17, L.sub.b-18 and L.sub.b-19 are installed at the front positions of the last pockets H.sub.31, H.sub.63, H.sub.95, H.sub.127 in the stages A, B, C and D, respectively. The outputs of the photoelectric devices are supplied through the OR circuit 101 to the differentiator circuit 102 to obtain the shift pulse l.sub.3 by which the data in the register Q.sub.30 is shifted to the register Q.sub.31. Thus, re-synchronization is again achieved.

A monitor circuit is connected to the output of the register Q.sub.7. The No. 16 and No. 8 bit position lines of the register Q.sub.7 is connected to a code identifying circuit 99 which generates the output when at least one of the No. 16 and No. 8 bit positions is a binary 1. The output of the circuit 99 is supplied to a timing monitor 100 comprising a mono-stable multivibrator. The shift pulse l.sub.8 obtained from one of the photoelectric devices L.sub.b-1, L.sub.b-5, L.sub.b-9 and L.sub.b-13 is also supplied to the monitor 100. The monitor 100 generates an alarm signal when the shift pulse P.sub.8 is not supplied within a predetermined time period after the output of the circuit 99 is supplied thereto. Because the articles of mail bound not for the first pocket group has a pocket selection code in which at least one of the No. 16 and No. 8 bit positions is a binary 1, the shift pulse l.sub.8 is obtained within a predetermined time period after the output of the circuit 99 is obtained. Therefore, when the pulse l.sub.8 is not supplied within the predetermined time period from the reception of the output of the circuit 99, an alarm signal is generated from the monitor 100.

Similar monitor circuits are connected to the registers Q.sub.15, Q.sub.23 and Q.sub.30, and the alarm signals are generated when a misoperation is detected at the end of each pocket group timing period. For example, there is provided the code identifying circuit 103 for generating an output when the No. 16, No. 8, No. 4, No. 2 and No. 1 bit posistion are all binary 1. The output of the circuit 103 is supplied to the timing monitor 104 which generates an alarm signal when the shift pulse l.sub.31 is not supplied within a predetermined time period measured from the reception of the output of the circuit 103.

The last register Q.sub.31 is connected to the code identifying circuit 105 for generating the output when at least one of the No. 16, No. 8, No. 4, No. 2 and No. 1 bit position is binary 0. The circuit 105 detects the mis-sorting in which articles of mail bound for pockets other than the last pockets H.sub.31, H.sub.63, H.sub.95 and H.sub.127 are transported to the last pocket.

It will be apparent that the embodiment shown is only exemplary and that various modifications can be made in construction and arrangement within the scope of the invention as defined in the appended Claims.

Claims

What is claimed is:

1. A flat-article sorting apparatus for an automatic mail handling system and the like, comprising:

a plurality of groups of flat-article receiving pockets;

means for detecting coded data on flat-articles to be sorted, said data identifying the pockets into which said flat articles are to be diverted and comprising a first and a second coded data identifying one of said groups and one of said pockets in said group, respectively;

first means connected to said detecting means for temporarily storing said data;

means for conveying said flat articles along a transport path, said transport path having a main path and branching paths, each branching path corresponding to one of said groups;

means installed on said transport path for detecting said flat articles and producing first shift pulses;

means for delaying said first shift pulses and producing second shift pulses;

second means for storing and transferring said data stored in said first storing means in response to said first and second shift pulses, said second storing means having a plurality of storing stages, said first shift pulses being applied to storing stages of said second storing means which are not adjacently positioned, said second shift pulses being applied to storing stages of said second storing means adjacent to said storing stages to which said first shift pulses are applied; and

means responsive to said data transferred in said second storing means for diverting flat-articles into branching paths and pockets within said branching paths;

said pockets being positioned so that the distances of the pockets having an identical second code from coded data detecting means are equal to each other;

said flat-article detecting means being installed at intervals equal to an integral multiple of the interval of said pockets.

2. A flat-article sorting apparatus as recited in claim 1 wherein said second storing means comprises:

a plurality of parallel shift registers connected to two serial divisions, the first of said divisions transferring said first coded data for diversion into one of said branching paths, and the second of said divisions transferring said second coded data for diversion into one of said pockets; and further comprising:

first means for monitoring said second coded data transferred by the second of said divisions of said parallel shift registers; and

first alarm means connected to said first monitoring means and said detecting means for producing a first alarm whenever a specific coded data is detected by said first monitoring means and no flat-article is detected for a predetermined time period.

3. A flat-article sorting apparatus as recited in claim 2, further comprising:

second means connected to the last storing stage of said second storing means for monitoring said second coded data transferred to the last stage; and

second alarm means for producing a second alarm when the coded data other than that representing the last pockets of said branching paths is detected.