JPH0737949B2 - Tablet inspection method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention automatically detects the presence or absence of tablets and the lack of tablets supplied to the depressions of a film (blister) formed to package tablets or capsules one by one. The present invention relates to a method and device for inspecting.

[Conventional technology]

In view of the convenience of hermetically packing and using tablets, in recent years, a method of packing each tablet in a shaped film, so-called blister, has been widely used. However, since it is automated from tablet compression to blister pack packing, it is necessary to inspect whether or not the tablets are reliably supplied in the blister and whether or not the tablets are normal.

Conventionally, as this tablet inspection apparatus, there is an apparatus shown in FIG. When continuously feeding the continuous blister from the supply drum 1 between the seal roll and the seal receiving roll 2 and supplying the continuous blister, the tablet is supplied from the tablet feeder 4 to the blister 3 between the supply drum and the seal roll. Is supplied one by one, and thereafter, light is emitted from a light source 5 such as a fluorescent lamp from below the blister, and an image is picked up by a CCD camera 6 at a position of 300 to 800 mm above the blister. The inspection is for defects.

[Problems to be Solved by the Invention]

Irradiate with a fluorescent lamp from the bottom of the blister as this inspection means,
Since the CCD camera captures images at a position of 300 to 800 mm above the blister, there is a distance from the blister to the CCD camera and a wide viewing angle, so unnecessary light enters, that is, detection accuracy due to scattered light entering. Is bad. In order to improve the detection accuracy, a method of covering the outer circumference of the light incident axis with a cover so that scattered light does not enter the CCD camera is also proposed, but only to some degree of accuracy improvement, the viewing angle is still Since it is wide, there is a limit to improvement in detection accuracy.

An object of the present invention is to improve the inspection accuracy by receiving light with a CCD line sensor at a position close to a blister with a viewing angle made as small as possible.

[Means for Solving the Problems]

The present invention has been made to achieve the above object.
Of the invention relates to the method, irradiating light from a light emitting diode as line light from below the blister in a direction orthogonal to the traveling direction of the blister film containing tablets, and disposing the light emitting diode and the blister at a position immediately above and adjacent to the blister. Equipped with a trigger signal generator that detects the dent of the film on the upstream side of the blister film supply to the CCD line sensor, and detects the dent of the blister film to be transferred by the trigger signal generator. , The line light from the light emitting diode is received by the CCD line sensor based on this detection time,
The gist is to measure and calculate the received light signal to detect the presence or absence of tablets in the recess and the quality such as chipping.

A second aspect of the present invention relates to an apparatus for carrying out the above method, which is an apparatus for inspecting the presence or absence and the lack of the tablets by transmitted light after filling the depressions of the blister film one by one. Light-emitting diodes arranged in a line in the orthogonal direction, a cylinder lens for concentrating this light as line light directly above the light-emitting diode, a light-emitting diode, a cylinder lens and a blister that face each other, and a blister. It is composed of a CCD line sensor placed in the upper proximity position, a trigger signal generator that is installed upstream of this CCD line sensor and detects the depression of the blister film and issues a trigger signal, and a computer that calculates the imaging signal. CCD line sensor that determines the start by detecting the depression by the signal generator It is an Abstract that calculated by computer imaging signal by.

[Work]

After storing the tablets in each recess of the blister that is fed out, the light emitting diode is linearly irradiated from the lower position of the film through the cylinder lens from the lower position of the film, and this is irradiated by the CCD line sensor at the position close to the upper part of the film. The light is received and this signal is scanned. Also, the position of the film is triggered, and these are calculated by the arithmetic circuit. Therefore, after detecting the blister tip position with a trigger, the line area received by the CCD line sensor is scanned to detect the area of the tablet, and the presence or absence of a chip, that is, the presence or absence of a tablet and the presence or absence of a tablet are determined by the judgment with the set value. To judge. Therefore, detection accuracy is improved and uniform detection can be performed.

〔Example〕

 The present invention will be described below with reference to the illustrated embodiments.

In the figure, reference numeral 1 is a supply drum for forming a required indentation of a required synthetic resin film.
When it passes through, it is formed into a blister 3 having a recess, and is guided to the seal roll and the seal receiving roll 2 side which face each other vertically.

A tablet feeder 4 is arranged at a predetermined position between the supply drum 1 and the seal receiving roll 2 to surely supply one tablet to each recess of the blister 3 that is continuously fed out, and at the same time, After the supply, the inspection device of the present invention is arranged between the seal receiving rolls 2 to detect the presence or absence of tablets and the lack of tablets.

This inspection system consists of light emitting diode 7, cylinder lens 8, CC
It is composed of a D line sensor 9, a light source 10 and a trigger detection cell 11. The light emitting diode (LED) 7 has a number of elements arranged in a straight line so as to be the entire length in the width direction of the blister film, and is arranged at right angles to the traveling direction of the blister. A so-called cylinder lens 8 in which a cylindrical lens is cut in half along its axis is arranged, and the light emitting diode 7 and the cylinder lens 8 are integrated so that the light of the light emitting diode is condensed by the cylinder lens, The blister 3 traveling above the cylinder lens is irradiated as a narrow band of light (line light). Above the advancing blister 3, for example
A CCD line sensor 9 is arranged at a position close to 3 mm to 50 mm and facing the light emitting diode 7 so that the line light from the light emitting diode 7 can be received by this CCD line sensor 9 after passing through the blister. Eggplant This C
The CD line sensor 9 is also arranged at right angles to the blister traveling direction. Therefore, the blister 3 containing tablets travels above the line light emitted from the cylinder lens at a right angle to the lens axis. Further, another light source 10 is arranged below the blister 3 so that the lower surface of the blister is obliquely illuminated and the light transmitted from the light source 10 through the blister is received as refracted light from the curved portion of the blister. A photo sensor (trigger detection sensor) 11 is arranged above the blister. The trigger may be mechanical.

Then, in the inspection device configured as described above, when the blister film 3 containing the tablets is moved from the left side to the right side in FIG. 1, the light illuminating the blister film from the light source 10 in the oblique direction is shown in FIG. As shown, the light is refracted at the curved portion of the blister, and the sensor 11 above the blister outputs a bright signal b as shown in FIG. This signal is used as a trigger signal to be regarded as a line sensor measurement start signal. On the other hand, when a voltage is applied to the issuing diode 7, it emits light. This light is condensed by the cylinder lens 8 arranged immediately above to form a very narrow band of light, which is irradiated from below the blister. Since the blister film is advancing in the direction orthogonal to the band of this light, the signal a set in advance is obtained when the tablet is not in the recess of the blister, but when the tablet is contained, The line light is blocked and the signal becomes a dark signal c. The difference between these signals is taken out, the dark signal is scanned from the position where the dark signal c appears, the area of the tablet is measured, and when the value is smaller than the set value, it is determined as a missing tablet, and when no dark signal is transmitted at all. This is determined as a defective tablet supply.

In addition, although the above-mentioned example explained the inspection method of the tablet,
The method for inspecting the presence or absence of capsules can also be applied.

〔The invention's effect〕

According to the present invention, since the line sensor receives the line light passing through the cylinder lens from the light emitting diode below the blister from the position immediately above the blister supplied with the tablets in the recess, the influence of scattered light Receiving is extremely rare and tablet inspection accuracy is improved. Further, since the light emitting diode is used for the light source, the light source has a long life and is not deteriorated and a constant light source can be obtained for a long time, so that stable inspection can be performed. Further, since it is captured as line light, it has an advantage that it can accurately detect even a chipped state of the tablet. Further, according to the present invention, the position of the tablet storage recess formed in the blister film is detected by the trigger signal generator, and the detection of the tablet is started thereby, so that the tablet is not supplied into the recess. In some cases, this can be detected.

[Brief description of drawings]

1 is a schematic explanatory view of the present invention, FIG. 2 is an external perspective view of essential parts, FIG. 3 is an explanatory view of inspection, and FIG. Explanatory drawing of inspection signal, fifth
The figure is a known example. 1 is a supply drum, 2 is a seal receiving roll, 3 is a blister film, 4 is a tablet feeder, 7 is a light emitting diode, 8 is a cylinder lens, 9 is a CCD line sensor, 10 is a light source, 1
1 is the trigger detection cell.

Claims (2)

[Claims] 1. A CCD line irradiating light from a light emitting diode as line light from below the blister in a direction orthogonal to a traveling direction of a blister film containing tablets, and arranging the light emitting diode and the blister at a position immediately above the blister in a close position. The sensor receives light, and equipped with a trigger signal generator to detect the dent of the film on the upstream side of the blister film supply to the CCD line sensor, and detects the dent of the blister film to be transferred by the trigger signal generator,
A line inspection from the light emitting diode is received by the CCD line sensor based on the time of this detection, the received light signal is measured and calculated, and the presence or absence of a tablet in the recess and the quality of a chip or the like are detected. Method. 2. A device for inspecting the presence or absence of the tablets by a transmitted light after filling the depressions of the blister film one by one, and arranging them in a line in a direction orthogonal to the blister in a line below the blister traveling direction. A light emitting diode, a cylinder lens for concentrating this light as line light directly above the light emitting diode, a CCD line sensor facing the light emitting diode, the cylinder lens with a blister in between, and a CCD line sensor arranged in a position near the blister. , This C
It is arranged on the upstream side of the CD line sensor and consists of a trigger signal generator that detects the depression of the blister film and issues a trigger signal, and a computer that calculates the imaging signal, and the start is determined by the detection of the depression by the trigger signal generator. , A tablet inspection device characterized in that an image pickup signal from a CCD line sensor is calculated by a computer.