JPH0647407B2 - Exclusion signal storage circuit of sorting and excluding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention is a device for rejecting defective articles determined by a checker among articles sequentially conveyed on a conveyor by a rejecter based on a reject signal from the checker. The present invention relates to a signal storage circuit.

[Background of the Invention]

An X-ray level checker is one of the checkers for judging the quality of articles sequentially conveyed on a conveyor. This is whether or not the filling amount of the contents of the can is appropriate, in other words, by irradiating X-rays to a product on a conveyor, for example, a sealed can of Juse, etc. with a photoelectric switch at a timing and detecting the X-ray dose transmitted through the can. If it is good or bad, it is determined.

By the way, such a level checker is used as a sorting and rejecting device during an article production process such as canning manufacturing, together with a rejecter for rejecting a can determined as a defective can from the conveyor. In the figure, a monostable multivibrator circuit (hereinafter abbreviated as MM) is used for storing (holding) the rejection signal from the level check position I to the rejection position II. In this case, if the distance L from the level check position I to the repulsion position II is larger than the maximum dimension (outer diameter of the article 1 when the article 1 is a can) D corresponding to the conveying direction (arrow a direction) of the article 1 to be inspected. In the case of one, one MM is insufficient.

That is, as described above, when D <L, as described above, in FIG. 2, during the storage time T corresponding to the distance L of the MM that starts the operation with the rejection signal, the rejection signal is output at every time interval t corresponding to the D. , Are continuously output, in other words, when it is determined that the conveyed articles 1 are continuously defective, the two articles 1 to be rejected by the rejection signal are not rejected together. Passing the exclusion position II.

Therefore, a plurality of MMs larger than L / D and a flip-flop circuit (hereinafter abbreviated as FF) are provided, and a method of distributing and storing the rejection signal is adopted, and FIG. 3 shows an example thereof. According to this, even if the rejection signal a is continuously output from the checker (not shown), it is sorted and stored in MM1 to MM4 by FF1 to FF3, so that the defective article corresponding to the stored rejection signal a is the rejection position II. To each of the MMs storing the rejection signal B,
The gate circuit G1 operates the rejector 2.

In the above-mentioned rejection signal storage circuit, each of MM1 to MM4 has a volume VR for time adjustment, which is adjusted according to the dimension D of the article 1 and the transport speed (conveyor speed) of the article 1.

However, in order to adjust the storage time of the rejection signal, it is necessary to adjust each volume VR of MM1 to MM4, and this work is troublesome and time-consuming. For this reason, there is a drawback in that it is extremely difficult to deal with it particularly when it is used in a sorting and rejecting apparatus in which conditions such as conveyor speed change.

[Object of the Invention]

The present invention has been made in order to eliminate the above drawbacks, even when the condition such as the conveyor speed is used in a variable sorting and rejection device, work for adjusting the storage time of the rejection signal is simple and in a short time. It is an object of the present invention to provide a rejected signal storage circuit of a selectable rejected device that can be performed.

[Outline of Invention]

The present invention is a device for rejecting defective articles determined by a checker among articles sequentially conveyed on a conveyor by a rejecter based on a reject signal from a checker, from a check position where the good or defective of the article is checked. When the distance to the rejecting position for rejecting a defective article is L and the maximum dimension corresponding to the conveying direction of the article is D, a predetermined number of n-ary counters larger than L / D and a rejecting signal from the checker are given by n A rejection signal distribution circuit for distributing and inputting to the binary counter as a count start signal; a clock pulse oscillation circuit capable of adjusting the oscillation frequency and supplying a clock pulse to each clock pulse input terminal of the n-ary counter;
A gate circuit for operating the rejector by output of a signal from any one of the n-ary counters is provided to configure a reject signal storage circuit, and the conveyor speed is adjusted only by adjusting the oscillation frequency of the clock pulse oscillator circuit. This makes it possible to respond to changes in conditions such as.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. FIG. 4 is a block diagram showing an embodiment of the rejection signal storage circuit of the sorting and rejecting apparatus according to the present invention.
Outputs a signal when counting to a predetermined number n, here 2048 clock pulses, and at the same time resets the reset circuit.
An n-ary counter in which the count is reset by 11a to 14a and returns to the initial state. Like the MM number shown in FIG. 3, this counter number is set to a predetermined number larger than L / D in FIG. 1, generally larger than L / D and an integer value that is closest to L / D. It

Reference numeral 15 denotes a rejection signal distribution circuit for distributing and inputting the rejection signal a from a checker (not shown) to the counters 11 to 14 as count start signals ro to ho. Here, it is composed of FF1 to FF3 as in the case of FIG. Has been done. Reference numeral 16 is a clock pulse oscillating circuit whose output terminals are connected to the respective clock pulse input terminals of the counters 11 to 14 and which supplies the clock pulses to the respective input terminals. For example, the oscillation frequency can be adjusted by operating the volume VR1. G2 is a gate circuit in which the output terminals of the counters 11 to 14 are separately connected to the same number of input terminals as the number of the counters, and the signal is output from any one of the counters 11 to 14 to eliminate the rejector. 2 operation signal H (= rejecting signal A) is output, and the rejecting device 2
Is to operate.

Next, the operation of the circuit of the present invention will be described with reference to FIG. 1 and FIG. Now, the distance L from the level check position I to the repulsion position II is the dimension (outer diameter) D of the article to be inspected 1.
The case where it is determined that four articles 1 to be conveyed are determined to be defective in succession.
As shown in FIG. 5A, the distribution circuit 15 is inputted with the rejection signal a in series at every time interval t corresponding to the dimension D.
The distribution circuit 15 distributes (in parallel) and inputs these into the counters 11 to 14 as four count start signals roh by FF1 to FF3. In this case, the count start signals roh hold the time interval t as shown in FIGS.

On the other hand, the oscillator circuit 16 supplies the clock pulse (see FIG. 5) to the clock pulse input terminal of each of the counters 11 to 14 at the predetermined frequency set by the volume VR1. Therefore, when the count start signal B is input to the counter 11, the counter 11 starts counting clock pulses,
When a predetermined number n, here 2048, is counted, that is, when the storage time T corresponding to the distance L has elapsed, a signal is output. When the signal G is output, the signal H is output from the gate circuit G2 to operate the rejector 2, and the first defective article 1 is rejected at the reject position II. When a signal is output, the reset circuit 11a resets the counter 11 to 0 (see FIG. 5).

During this time, the count start signal C is input to the counter 12 to start the counting operation. Similarly, when counting 2048, a signal is output and the rejector 2 is operated via the gate circuit G2 to cause the second defective operation. Exclude the article 1. counter
Similarly, 13 and 14 operate in the same manner, and the third and fourth defective articles 1 are sequentially rejected at the reject position II.

When the conveyed article 1 is continuously judged to be defective even after the fifth article, the above-described operation is repeated, and as a result, the rejection signal a is the distance set by the oscillation frequency of the oscillation circuit 16. It is stored (delayed) for a time T corresponding to L and sequentially supplied to the ejector 2 as an ejector operation signal H (see FIG. 5C), so that defective articles are ejected.

Here, a case where conditions such as the conveyor speed for carrying the article 1 change and it becomes necessary to adjust the storage time of the rejection signal a will be described. In this case, the distance L corresponds to the condition change. The time T may be calculated or actually measured, and the oscillation frequency of the oscillation circuit 16 may be adjusted by the volume VR1 according to the value. The oscillation frequency adjustment may be automatically performed by, for example, a speed control signal in the control circuit of the conveyor.

(Effect of the invention) As described above, the present invention is a device for rejecting a defective article determined by a checker among articles sequentially conveyed on a conveyor by a rejecter based on a reject signal from the checker, wherein the article is L is the distance from the check position for checking good or defective to the reject position for rejecting defective articles.
Assuming that the maximum dimension corresponding to the carrying direction of the article is D, a predetermined number of n-ary counters larger than L / D and a rejection signal from the checker are distributed and input as count start signals to the n-ary counter. The distribution circuit, the clock pulse oscillation circuit that can adjust the oscillation frequency and supplies the clock pulse to each clock pulse input terminal of the n-ary counter, and the signal is output from any one of the n-ary counters to output the signal. Since it is configured by including a gate circuit for operating the container, even when used in a sorting and rejecting device in which conditions such as conveyor speed are variable, the storage time of the rejecting signal can be adjusted simply by adjusting the oscillation frequency of the oscillation circuit. This is possible, and there is an effect that this time adjustment work can be performed easily and in a short time.

[Brief description of drawings]

1 and 2 are diagrams for explaining the storage time of the rejection signal from the checker, FIG. 3 is a block diagram showing an example of the rejection signal storage circuit using a plurality of MMs, and FIG. 4 is a book. FIG. 5 is a block diagram showing an embodiment of the rejection signal storage circuit of the sorting and rejection apparatus according to the invention, and FIG. 5 is a time chart for explaining the operation of the circuit. I ... Check position, II ... Rejection position, 1 ... Article, 2 ... Rejector, 11-14 ... n-ary counter, 15 ... Rejection signal distribution circuit, 16
… Clock pulse oscillator, VR1… Volume for adjusting oscillation frequency, G2… Gate circuit.

Claims (1)

[Claims] 1. A device for ejecting a defective article determined by a checker among articles sequentially conveyed on a conveyor by an ejector based on a rejection signal from the checker, wherein a check position for checking good or defective of the article. When the maximum dimension corresponding to the conveyance direction of the article is D and the distance from the sheet to the rejecting position for rejecting the defective article is L, a predetermined number of n-ary counters larger than L / D and the rejection signal from the checker are described above. Any of the rejection signal distribution circuit for distributing and inputting to the n-ary counter as a count start signal, the clock pulse oscillator circuit capable of adjusting the oscillation frequency and supplying the clock pulse to each clock pulse input terminal of the n-ary counter, and the n-ary counter And a gate circuit that operates the rejector by outputting a signal from one of them. Reject signal storage circuit that sorting displacing device.