DD293016A5 - CIRCUIT ARRANGEMENT FOR THE NUMBERING OF STUECKGUETERN - Google Patents

Abstract

The invention relates to a circuit arrangement for the counting of piece goods, which are already occasionally passed by a light barrier unit, z. B. bread. It is based on the object of constructing a counting circuit for counting piece goods using a light barrier unit in such a way that all pulses originating from the light barrier unit are detected in their chronological order, so that only a forward count pulse occurs when a piece item passes the light barrier unit in the prescribed direction and that upon the occurrence of irregularities corresponding error signals with error type indication are triggered. According to the invention, the object is achieved by a first and a second light emitter and a first and second light receiver with an intermediate transport device with piece goods to be transported, for. B. bread. In this case, the first Lichtempfaenger is connected via a first pulse shaper both with a clock generator and with a first shift register and a short-term member. The second Lichtempfaenger is connected via a second pulse shaper both with the clock generator and with a second shift register and the short-term member. A synchronizing and comparison circuit is connected on the input side to the first and the second shift register the clock generator and the short-term member and the output side with an evaluation stage. The evaluation stage is a counting circuit, a long-term member and a fault indication circuit downstream. The counting circuit is followed by a decoding and display unit. The long-term element is connected on the output side to the fault indication circuit. FIG {SCORE; piece cargo; Loaf; Photocells unit; Photocell, double; Error signal, acoustic; Unregelmaeszigkeit; Stueckguttransport}

Description

During normal passage of a toughened object, quite specific time-dependent pulse sequences are produced at a double-light barrier. These are correspondingly upgraded and compared with a specified bit pattern. This results in a very specific level sequence as an output variable, and only if this level sequence reaches the input of the evaluation, a count pulse is formed. Deviations are identified as errors and trigger audible alarms with a corresponding error message.

This can then be reacted to occurring errors. The counting result has a high accuracy value and can be used for accounting purposes.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the illustrated drawing, a block diagram of the circuit arrangement according to the invention is shown.

The figure shows a first and a second light emitter 1, 2 and a first and second light receiver 3.4 with an intermediate transport device with cargo to be transported 5, z. B. bread. The first light receiver 3 is connected via a first pulse shaping stage 6 both to a clock generator 8 and to a first shift register 9 and a short-time element 11. The second light receiver 4 is connected via a second pulse shaper 7 also both with the clock generator 8 and with a second shift register 10 and the short-term member 11. A synchronizing and comparator stage 12 is connected on the input side to the first and the second shift register, 10, the clock generator and the short-time member 11 and the output side to an evaluation stage 13. The evaluation stage 13 is a counter circuit 14, a long-term member 15 and a fault indication circuit 16 connected downstream. The counting circuit 14 has its output connected to the decoding and display unit 17. The long-term member 15 is interconnected on the output side with the fault indication circuit 16.

The double sensor consisting of the first and second light emitters and light receivers 1, 2, 3, 4 and the first and second pulse shaper stages 6, 7, which can, for example, operate on an infrared basis, takes the passage of a piece goods 5, e.g. As a bread, true, the luminous flux is interrupted, and thus the conductivity of the phototransistors is changed. To the same extent, this also changes the voltage level at the pulse output behind the phototransistors. In the first and second pulse shaper 6,7 a steepening of the pulse edges is achieved, and it is ensured at the same time that the now unique digital output signals receive their necessary significance. These output signals are supplied to the first and second shift registers 9, 10, the clock generator 8 and the short-time member 11, d. h., The output signal of the first pulse shaper 6 is located at the input of the first shift register 9, z. B. the D input of a 4-bit shift register, and the output of the second pulse shaper 7 is located at the input of the second shift register 10. At each level change at the outputs of the pulse shaper 6.7 a clock is formed, the contents of the shift register. 9 , 10 moves on one place. At the same time, the current information at the D input is transferred to the shift registers 9, 10. Since under normal conditions at each sensor at the passage of a piece good 5 two level changes arise, a total of four clocks are formed. Thus, after passage of a piece good 5 under normal conditions at each output of the shift register 9.10 a very specific information that allows a statement about the direction of the piece goods 5. To apply the respective information in the shift register, it is necessary that at each LH edge and HL edge, which arises in the pulse shaper 6.7, a clock pulse is formed, which then causes the transfer of the information in the respective shift register. Furthermore, it is necessary that after every fourth clock pulse, a further pulse is formed, which then controls the synchronizing and comparator stage 12 and takes over the information at the outputs of the shift registers 9 and 10 in the synchronizing and comparator stage 12. In case of irregularities in the sensors, which have their origin in the operating conditions (for example, due to contamination of the lenses of the light barrier) are no longer all clocks formed when passing a piece goods 5 at the sensors. Likewise, such a situation may arise when the sensors are influenced by persons through arbitrary actions. To cope with this circumstance, the passage of a piece good 5 and thus the time duration of the piece goods 5 in the area of the sensors is monitored by means of the short-term member 11. The short-term member 11 consists of a retriggerable monoflop and an RS flip-flop whose output information are linked together and generate at timing irregularities in the pulse train a control pulse, which also controls the synchronizing and comparator stage 12. If all the pulses from the photocell arrive, no control pulse is formed by this stage. For each irregularity at the light barrier but an evaluation of the contents of the shift registers 9,10 is still guaranteed by this short-term member 11.

The output information of the two shift registers 9,10 are supplied via D flip-flops EX-OR gates. The D flip-flops are either driven by the output information of the stage for generating the control clocks by the pulse, which occurs at every fourth control clock, or the control pulse comes from the short-term member 11. With the LH edge of one of these control pulses, the information to the D inputs of the D flip-flops taken and placed simultaneously to an input of the EX-OR gates. The other input is determined according to the normal information that would be applied to the gate. This is then determined whether the output information to the shift registers 9.10 corresponds to a normal pulse train, as it arises when passing a piece goods 5, or whether it deviates from it. From each EX-OR gate, this information is available at the output for further evaluation. In the evaluation stage 13, the information that is present at the outputs of the EX-OR gate, linked together so that a count-up pulse only arises when the corresponding information is unique. This forward pulse is fed to a normal decadal forward counter 14, where the pulses are summed and the respective count and thus the count result is made visible via a decoder by means of the display unit, by the decoding and display unit 17. At the same time, the long-term member 15 is always returned to the initial state with the aid of the forward counting pulses. If the count-up pulses remain off, the long-term element 15 triggers an error pulse after a defined period of time. This error pulse and all irregularities identified as such in the evaluation stage 13 control the

Error indication circuit 16 on. The corresponding errors are handled by a decoder using

7 segment display elements hexadecimal optically marked. The error display allows an accurate determination of errors and inconsistencies as well as their short-term removal. All count-up pulses are applied to the input of a decade counter of the counting circuit 14 and counted there. The respective result is supplied via a decoder of the decoding and display unit 18, so z. B. a 7-segment element display. It is the real result of the piece goods to be counted 5.

Claims (1)

Circuit arrangement for counting piece goods using two light barriers, which are connected to an evaluation circuit, characterized in that the first light receiver (3) via a first pulse shaper (6) both with a first shift register (9) and with a clock generator (8 ) and a short-term member (11), that the second light receiver (4) via a second pulse shaper (7) with both a second shift register (10) and with the clock generator (8) and the short-term member (11) is connected a synchronizing and comparison circuit (12) on the input side to the first and second shift register (9; 10), the clock generator (8) and the short-term member (11) and the output side with an evaluation stage (13) is connected to the evaluation stage (13) Counting circuit (14), a long-term member (15) and a fault indication circuit (16) are connected downstream, wherein the long-term member (15) on the output side with the Fehleranzeigeschal tion (16) and the counting circuit (14) with a decoding and display unit (17) are connected. For this 1 page drawing Field of application of the invention The invention relates to a circuit arrangement for counting piece goods, which are already occasionally passed by a light barrier unit, e.g. Loaf. Characteristic of the known state of the art It is a counting device for counting belted components known (DE-OS 2937649), consisting of a light emitter, two juxtaposed light receivers and an evaluation circuit. The evaluation circuit detects the direction of movement of the components and outputs counting pulses when all connecting wires of the components are present. Also counting devices are known (US-PS 3692980, DE 2830813) for counting piece goods using Lichtstrahl. A defined counting area is illuminated by means of a lighting device or scanned line by line with light. Photodiodes are used to generate video signals which are a measure of the light intensity and are used via comparators to decide whether an object is in the counting area or not. With none of these known counting devices it is possible to accurately count piece goods even if irregularities in the transport area (blockage, reverse transport ...) or failure of components (for example faults on the photoelectric unit) occur with simultaneous exact failure signaling. Object of the invention The aim of the invention is a circuit arrangement for counting piece goods, without manipulation possibilities, d. H. Irregularities in the transport of the light barrier unit, to allow while signaling the nature of the irregularity. Explanation of the essence of the invention The invention has for its object to build a counting circuit for counting piece goods using a light barrier unit so that all resulting from the light barrier unit pulses are detected in their chronological order that only a Vorwärtszählimpuls arises when a cargo the light barrier unit in the prescribed direction happens and that when irregularities occur corresponding error signals are triggered with error type. According to the invention the object is achieved by a first and a second light emitter and a first and second light receiver with an intermediate transport device with cargo to be transported z. B. bread. In this case, the first light receiver is connected via a first pulse shaper stage both with a clock generator and with a first shift register and a short-time member. The second light receiver is connected via a second pulse shaper both with the clock generator and with a second shift register and the short-term member. A synchronization and comparison circuit is the input side connected to the first and the second shift register, the clock generator and the short-term member and the output side with an evaluation stage. The evaluation stage is a counting circuit, a long-term member and a fault indication circuit downstream. The counting circuit is followed by a decoding and display unit. The long-term element is connected on the output side to the fault indication circuit.