Inspection system

Abstract: A system capable of inspecting by a leaking liquid inspection apparatus and an entering air inspection apparatus provided therein. The system has a conveyor line (12) conveying plural containers (W), a first sampling means (14) moving the containers (W) to a position at which the leaking liquid inspection apparatus is provided, a second sampling means (16) moving the containers (W) to a position at which the entering air inspection apparatus is provided, a first stopper (18) interrupting the containers (W) at a position of the first sampling means (14), a second stopper (20) interrupting the containers (W) at a position of the second sampling means (16), and a third stopper (22) provided upstream from the first and second stoppers (18, 20).

Description: The invention relates to an inspection system for judging the quality of a container made of a flexible material such as paper, and filled with, for example, drink (such as a lactic acid drink), more particularly, to be capable of facilitating a leak liquid inspection and an entering air inspection on the same conveyor line at the same time. If the liquid such as a lactic acid drink fed into the container leaks, various disadvantages will result, for example, a producing area becomes unsanitary, facilities for transporting after shipment are contaminated, and further the consumer becomes dissatisfied when the leaky container is passed to the consumer. The leak of the contents may be caused by various reasons. For example, the container may have a defect in itself, and/or, there may be something wrong in the system for sealing the container after filling with the liquid. In order to prevent such disadvantages caused by such a liquid leak, the applicant disclosed a leaking liquid inspection apparatus for detecting the liquid leak conveniently in Japanese Patent Application Disclosure No. 5-124628. According to the aforementioned prior art, judgment of yes/no for the liquid leak can be made automatically, and therefore automation of the leaking liquid inspection can be attained. As compared with a manner of inspecting all subjects, since a sampling inspection takes place in this prior art, a pressure reducing means and/or a measuring means can be facilitated in a smaller scale, and/or, an elimination (automatic elimination) of an inferior container can be easier. On the other hand, if air enters in the container, the amount of liquid fed into the container is reduced by the amount of air entered in the container. As a result, various disadvantages will occur, for example, especially, if the liquid is of drink, the drink fed in a volume less than the regular value makes the consumer annoyed. In order to avoid the disadvantages caused by the aforementioned entering air, the present applicant disclosed an entering air inspection apparatus capable of certainly, quickly and automatically detecting that air enters the container when the liquid is fed into the container made of flexible material, in Japanese Patent Application Disclosure No. 5-124629. According to such prior art (No. 5-124629), since the quality of the container can be judged by detecting yes/no of a change of distance between the surface of the container and a fixed point in a closed system accommodation means after and before reducing a pressure, automation of the entering air inspection can be attained whilst retaining sufficient accuracy of the inspection. As compared with a manner of inspecting all subjects, since a sampling inspection takes place in this prior art, a pressure reducing means and/or a measuring means can be facilitated in a smaller scale, and/or, elimination (automatic elimination) of inferior containers can be easier. The above-mentioned leak liquid inspection apparatus and the entering air inspection apparatus, which were filed as a Japanese patent application by the applicant and are disclosed as a Japanese patent application disclosure, are very effective art. At the present state, the above-mentioned two apparatuses are provided as different apparatuses in an inspection line (an inspection area). However, responding to desires for simplification and space saving of the inspection area, it is desirable that the leaking liquid inspection apparatus and the entering air inspection apparatus are structured to be provided in the same system to simultaneously facilitate the leaking liquid inspection and the entering air inspection. It is an object of the present invention to provide an inspection system simultaneously facilitating the leaking liquid inspection and the entering air inspection by including therein the leaking liquid inspection apparatus and the entering air inspection apparatus together. An inspection system of the present invention includes a leaking liquid inspection apparatus for inspecting a container made of flexible material in order to detect a leaking liquid and an entering air inspection apparatus for inspecting the container in order to detect air entering the container with liquid when the container is fed with liquid, and further has a conveyor line for conveying plural containers, a first sampling means for moving the container as an inspection subject to a position at which the leaking liquid inspection apparatus is provided, a second sampling means for moving the container as an inspection subject to a position at which the entering air inspection apparatus is provided, a first stopper for interrupting the container to be the inspection subject at a position of the first sampling means while the container is moving on the conveyor line, a second stopper for interrupting the container to be the inspection subject at a position of the second sampling means while the container is moving on the conveyor line, and a third stopper located at an upstream position from the first and second stopper. Each of the first and second sampling means has an arm, an article hold means provided at the end of the arm, a horizontally moving means for moving the arm and the article hold means in a horizontal direction, and a vertically turning means for semicircularly turning the arm in a vertical plane. It is preferable to move the arm and the article hold means close to and away from the container by the horizontally moving means and to move the container in a held state in the article hold means by operating combinedly the horizontally moving means and the vertically turning means. It is preferable that the horizontally moving means has rails oriented to provide movement in the horizontal direction, a movable pedestal reciprocating on the rails, and a piston cylinder system causing the movable pedestal to reciprocate. And the rails can be defined as a single-line or a plural-line. As for the article hold means, its strength of hold may be controlled in response to the weight of the article, more specifically, a way of holding the article is not intended to be limited especially, therefore, for example, a way of clamping or gripping the article can be considered. However, when the inspected article is made of fragile material for the package, it is preferable to structure a system (a suction member) for holding to adhere to the article by sucking. It is preferable that each of the first and second sampling means has the arm, the article hold means provided at the end of the arm, a piston cylinder system provided at the end of the arm to move the article hold means in a horizontal direction, and the vertically turning means for semicircularly turning the arm holding the container in the article hold means in a vertical plane. And when the above-mentioned structure is applied, it is desirable to provide a security system to maintain the steadiness of the whole arm even if an overload acts on the suction members. Furthermore, an inspecting position of the leaking liquid inspection apparatus corresponds to the position at which the container is semicircularly moved in a lengthwise direction from the conveyor line by the vertically turning means of the first sampling means. Similarly, an inspecting position of the entering air inspection apparatus corresponds to the position at which the container is semicircularly moved in a lengthwise direction from the conveyor line by the vertically turning means of the second sampling means. It is desirable for execution of the present invention to have a control means for controlling to cause the article conveyed on the conveyor line to undergo the leaking liquid inspection and the entering air inspection by operating to mutually associate the first and second sampling means and the first, second and third stoppers. In addition, it is desirable for execution of the present invention to use photocells as various sensors and a motor for the arm as the vertically turning means. According to the present invention including the above-mentioned structure, when the container to be the subject for the leaking liquid inspection is conveyed on the conveyor line to reach a position of the first sampling means, the first stopper means operates to interrupt such container. The first sampling means moves the container interrupted by the first stopper to a position at which the leaking liquid inspection apparatus is provided. More concretely, the movable pedestal is moved in the horizontal direction towards the conveyor line by means of the piston cylinder system, the article hold means provided at the end of the arm of the first sampling means adheres the container interrupted by the first stopper, and then, the movable pedestal, together with the container, is moved in the horizontal direction away from the conveyor line. Thereafter, the arm holding the container is semicircularly turned 180 degrees in the vertical direction by the vertically turning means, and then , the container reaches the inspecting position of the leaking liquid inspection. After carrying out the leaking liquid inspection in the above-mentioned manner, the container is returned onto the conveyor line in the opposite process to the aforementioned process, and operation of the first stopper means is released. The containers conveyed on the conveyor line are subject to the leaking liquid inspection, as aforementioned. The entering air inspection is carried out in the same way as the leaking liquid inspection. That is, when the container to be the subject for the entering air inspection reaches a position of the second sampling means, the second stopper means operates to interrupt the container. The second sampling means moves the container to a position at which the entering air inspection apparatus is provided. More concretely, the movable pedestal is moved in the horizontal direction toward the conveyor line in order to adhere the article hold means of the second sampling means to the container, and then, the movable pedestal, together with the container, is moved in the horizontal direction away from the conveyor line. Thereafter, the arm holding the container is semicircularly turned 180 degrees in the vertical direction by the vertically turning means, in order to move the container to the inspecting position of the entering air inspection. After carrying out the entering air inspection in the above-mentioned manner, the container is returned onto the conveyor line in line with the opposite process to the aforementioned process, and operation of the second stopper is released. While the leaking liquid inspection and the entering air inspection are carried out, since the first and second stoppers operate, other containers on the conveyor line are brought to a standstill at the position of the sampling means for the inspection. As a solution, if the third stopper means positioned upstream of the first and second stopper means is adapted to operate during the inspections, other new containers are not conveyed from the upstream side while the leaking liquid inspection and the entering air inspection are carried out. Therefore, the disadvantage based on the containers being brought to a standstill at the positions of the sampling means for the inspections is dissolved. The leaking liquid inspection and the entering air inspection can be facilitated at the same time and also can be independently facilitated in relation to one another. Therefore, one inspection may be finished or interrupted, however, the other inspection can be continued. In the present invention, the subject is adapted to be moved to the inspecting position by a combination of the movement in the horizontal direction and the semicircular turn in a vertical plane, therefore, there is no damage to the subject, unlike the case in which the subject is moved solely in the horizontal direction across the gap between the conveyor line and the inspecting position. Furthermore, when the subject is moved by the movement of the vertical reverse turn solely, if the subject is close to the side of the arm, it is possible that the subject is broken by the suction member in a case that the suction member provided on the end of the arm srikes to the subject. Consequently, according to the present invention in which the horizontal movement is carried out, when the suction member at the end of the arm abuts the subject, the arm merely moves in the horizontal direction but does not turn reversely, and therefore, the subject is prevented to be broken. An embodiment according to the present invention will now be described by way of example only with reference to attached drawings, in which: Fig. 1 is a plan view of a preferred embodiment according to the present invention; Fig. 2 is a fragmentary enlarged front view of the embodiment of Fig. 1; Fig. 3 is a flowchart of a control process according to the embodiment of Fig. 1; Figs. 4 to 14 are fragmentary block diagrams of steps of the control process of Fig. 3; Fig. 15 is a plan view of a position definition means for an inspecting position; Fig. 16 is a plan view of another position definition means than means; Fig. 17 is a fragmentary plane view of a leaking liquid inspection apparatus; Fig. 18 is a flowchart of a leaking liquid inspection; and Fig. 19 is a flowchart of an entering air inspection. In Fig. 1 reference numeral 10 indicates a whole inspection system according to the present invention, in which the overall composition of a leakage liquid inspection apparatus and an entering air inspection apparatus in the inspection system are omitted to be shown. The inspection system 10 is accompanied by a conveyor line 12 to convey thereon plural containers W made of paper as an inspection subject in a conveyable direction designated with an arrow R in the drawing. Along the conveyor line 12, adjoining a first sampling means 14 to move the vessel W from on the conveyor line 12 to a place at which the leakage liquid inspection apparatus (not shown in Fig. 1) is provided, there is provided a second sampling means 16 to move the container W from on the conveyor line 12 to a place at which the entering air inspection apparatus (not shown in Fig.1) is provided. At a position just by the first sampling means 14 on the conveyor line 12, a first stopper 18 is provided to interrupt the containers W moving on the conveyor line 12, similarly, at a position by the second sampling means 16, a second stopper 20 is provided. Furthermore, a third stopper 22 is provided at a position upstream of the aforementioned first and second stoppers 18, 20 (or the first and second sampling means 14, 16). The first sampling means 14 and the second sampling means 16 are respectively adapted to reciprocate on two pairs of rails 24, 26 and on two pairs of rails 28, 30 in a direction shown with the arrow A by piston cylinder systems for moving pedestals (air cylinders) 32, 34. Again the first and second sampling means 14, 16, have respectively movable pedestals 36, 38, arms 40, 42 turning semicircularly through 180 degrees (or moving in a reverse turn) on a plane of a vertical direction (a plane perpendicular to paper in Fig. 1), and article hold means (suction members) 44, 46 respectively provided at the ends of these arms 40, 42. Each of the suction members 44, 46 includes a convenient structure to hold the container W by means of suction or adhesion. And, all the rails 24, 26, 28, 30, the air cylinders for moving pedestals 32, 34 and the movable pedestals 36, 38 form a horizontally moving means to move the arms and the article hold means in a horizontal direction. Incidentally, a vertically turning means to turn the arms 40, 42 holding the containers W with the article hold means (the suction members) 44, 46 in a vertical plane is not shown. Suction force or negative force produced by the suction members 44, 46 is defined in a range capable of certainly holding the container W and not to damage the container W. As shown in the drawing, instead of the air cylinders for moving pedestals 32, 34, renewedly, air cylinders are provided between the arms 40, 42 and the article hold means (the suction members) 44, 46 to cause the suction members 44, 46 to be capable of extending in a lengthwise direction of the arms 40, 42. Incidentally, it is suitable to provide a security system (non-shown) to reduce steadiness of the suction members 44, 46 if an overload acts on the suction members 44, 46. As for the leaking liquid inspection apparatus not shown in Fig. 1, an inspecting position of the leaking liquid inspection apparatus corresponds to a position into which the container W is reversely turned in a lengthwise direction from the conveyor line 12 by the arm 40 of the first sampling means 14. Similarly, an inspecting position of the entering air inspection apparatus corresponds to a position into which the container W is reversely turned in a lengthwise direction from the conveyor line 12 by the arm 42 of the second sampling means 16. The third stopper 22 is extended by an air cylinder 48 for operating the stopper (the third stopper). More specifically, when the stopper 22 is extended by the air cylinder 48, the third stopper 22 interrupts to press the flowing container W against a side wall 12w (shown with two-dot chain line in Fig. 1) of the conveyor line 12, therefore, the vessels W following behind the interrupted container W are interrupted to be pressed against the side wall 12w. As shown in Fig. 2, the first stopper 18 is operated by extension of an air cylinder 50 for operating the first stopper. More specifically, on shortening the air cylinder 50, the first stopper 18 lifts down in the conveyor line 12 to interrupt the flowing containers W, on the other hand, on extending the air cylinder 50, the stopper 18 lifts up from the conveyor line 2 to wait at a position not to interrupt the flowing vessels W. Similarly, the second stopper 20 is worked by extension of an air cylinder 52 for operating the second stopper. Operation of the embodiment of Figs. 1 and 2 will be explained with reference to Figs. 3 to 14. In Fig. 4 to 14, the first sampling means 14 and the second sampling means 16 have the same operation except that the container W is moved to the position of the leaking liquid inspection apparatus or the entering air inspection apparatus, so that only the way of operating the first sampling means 14 is shown. Incidentally, in Figs. 4 to 14, reference symbol C shows a position at which the leaking liquid inspection apparatus is provided. (But, in considering the way of operating the second sampling means 16, the reference symbol C should be understood to show a position at which the entering air inspection apparatus is provided). On the conveyor line 12 for the container W in Fig. 1, plural vessels W are conveyed (step S0 in Fig. 3). In this state, the containers W upstream (to the left in Fig. 1) from the position of the third stopper 22 are interrupted by the third stopper 22 lifted down by extending the air cylinder 48 (step S1). Next, the air cylinder 48 is shortened and extended again in order to cause the third stopper 22 to pass only one container W (one-shot). In response to conveying only one container W downstream the third stopper 22, the air cylinder 52 is shortened to lift the second stopper 20 down in the conveyor line 12 (step S2). As a result, the container W is interrupted at a position before the second sampling means 16 by the second stopper 20 (step S3). Furthermore, another container (a container shown with reference symbol W1 in Fig. 4) is conveyed to the downstream by one-shot of the third stopper 22. At the same time, the first stopper 18 is operated by the air cylinder 50 as shown in Fig. 4 (step S4), and the container W1 is interrupted as shown in Fig. 5 (step S5). In this step, the containers W1 and W respectively stop at positions before the first and second sampling means 14, 16. Next, the air cylinders 32, 34 are extended to move the movable pedestals 36, 38 toward the conveyor line 12 in order to cause the suction members 44, 46 respectively provided at the ends of the arms 40, 42 to adhere and suck the sides of the containers W1, W to hold the containers W1, W (step S6 in Fig. 6). If a reverse turn movement H1 is carried out in this process (step S6) shown in fig. 6, the container W1 will be likely to be damaged by the arm 40 and the suction member 44, however, actually, in the embodiment shown in the drawings, the suction member 44 at the end of the arm moves only in a horizontal direction as shown with an arrow S2 in fig. 6 to abut to the side of the container W1 and the arm 40 still does not move reversely in the vertical direction, so that the container W1 is not broken. Explaining the first sampling means 14 in this step, the air cylinder 32 is shortened to cause the movable pedestal 36 to move in the horizontal direction of arrow S1, and the arm 40 is reversely turned in the vertical direction with the container W1 as shown with the arrow H1 (step S7 in Fig. 7). Therefore, as compared with facilitating solely the movement in the horizontal direction S1, the movement in the horizontal direction shown with the arrow S1 and the reverse turn movement in the vertical direction shown with the arrow H1 (a turn in a plane perpendicular to the paper in Fig. 7) are facilitated combinedly, so that the subject W1 is unlikely to be damaged by the gap (not shown) between the conveyor line 12 and the inspecting position C. The arm 40 holding the container W1 reversely turns in the vertical direction to cause the container W1 to reach the inspecting position C(see Fig. 8), so that when the container W1 reaches the inspecting position C, the movable pedestal 36 moves in a direction of the arrow S2 to separate the suction member 44 from the container W1 and, immediately, the leaking liquid inspection for the container starts (step S8 in Fig. 9). During the leaking liquid inspection for the container W1 (step S8), the first, second and third stoppers 18, 20 and 22 are moved back to the predetermined initial position or are released not to interrupt conveyance of other containers (step 9), so that other containers W behind the container W1 flow smoothly on the conveyor line 12 (see Fig. 9, fig. 10). After completing the leaking liquid inspection (Fig. 10), the movable pedestal 36 moves in a direction of the arrow S1 to cause the suction member 44 to adhere to the container W1 for suctioned hold (step S10 in Fig. 1). In this step, the third stopper 22 is operated to interrupt conveyance of other containers on the conveyor line 12 (step 11). The arm 40 holding the container W1 is semicircularly moved to lift the vessel W1 down (an arrow H2) while being moved in the horizontal direction (the arrow S2) toward the conveyor line 12 (step S12 in Fig. 12). The container W1 is released from the suctioned holding of the suction member 44 when reaching the conveyor line 12 (Fig. 13), and the first sampling means 14 moves in the horizontal direction of the arrow S1 to return to its initial position (the position shown in Fig. 4) (Fig. 14). On the other hand, the second sampling means 16 has the almost same processes after the step S6 as the first sampling means 14. That is, the movable pedestal 38 moves in the horizontal direction to the side of the inspecting position while the arm 42 is reversely turned in the vertical direction (step S13), and the entering air inspection takes place (step S14). During the entering air inspection for the container W, all the first, second and third stoppers 18, 20 and 22 are released like the case of the step S8 (step S9), and after completing the entering air inspection, the suction member 42 holds the container W to adhere and suck again (step S15). The third stopper 22 is operated (step S11), and the arm 42 holding the container W is semicircularly moved to lift the container W down while the movable pedestal 38 is moved in the horizontal direction toward the conveyor line 12 (step S16) in order to return the container W onto the conveyor line 12. When both of the first and second sampling means 14, 16 respectively return the container W1, W onto the conveyor line 12, the third stopper 22 releases interruption of conveyance of other containers W (step S17). After this, a cycle of the process described thus far is repeated. Incidentally, the drawings do not illustrate clearly, but an air spray port is provided downstream of the third stopper 22 (to the right in Fig. 1) to blow away water-drops wetting the surface of the container W by air gushing out therefrom. The air spray port is provided in order to prevent from producing wrong operation in the leaking liquid inspection apparatus as will be described below. As shown in Fig. 15 and Fig. 16 (a plan view), it is preferable that stoppers for defining a position are respectively provided to an inspecting position C1 for the leaking liquid inspection and an inspecting position C2 for the entering air inspection. The drawings do not illustrate clearly, but when unusualness is found by the leaking liquid inspection or the entering air inspection, the unusual container is removed out of the flow at a position where the unusual container reaches the downstream of the second stopper 20. If the unusualness occurs twice successively, the third stopper 22 works to stop the flow of the conveyor line 12. Now, explanation concerning the leaking liquid inspection apparatus and the entering air inspection apparatus will be offered. The leaking liquid inspection apparatus is almost the same as apparatus disclosed by Japanese Patent Application Disclosure No. 5-124628, but as shown in Fig. 17, there is a different point by which plural slender members 72 as an insulator are designed on an electrode plate 70. The slender member 72 prevents the containers W, W1 from directly touching an electrode 74. As for the process of the inspections illustrated with a flowchart in Fig. 18, the difference point is cited as difference in expression mainly but the technical contents are the same as the contents disclosed by Japanese Patent Application Disclosure No. 5-124628, so that repetitive explanation is omitted. Fig. 19 illustrates a flowchart of inspection carried out in the entering air inspection apparatus. The entering air inspection apparatus is the same as an apparatus disclosed by Japanese Patent Application Disclosure No. 5-124629 except the difference in expression, so that repetitive explanation is omitted. Incidentally, although particular preferred embodiments of the invention have been disclosed as examples, it is to be understood that the present invention is not intended to be limited to the above-described technical contents. The operative effects of the present invention will be listed as follows: (1) The leaking liquid inspection and the entering air inspection can be carried out in the same system certainly. (2) Simplification and a space-saving for the inspection process can be attained. (3) It is possible to facilitate both of the leaking liquid inspection and the entering air inspection at the same time or facilitate independently the leaking liquid inspection and the entering air inspection. (4) Even if one inspection is finished or interrupted, the other inspection can continue with its operation. (5) The subject is prevented from being damaged by a gap etc., when being moved from the conveyor line to the inspecting position. (6) The inspection subject is prevented from being broken when a member such as the arm is reversely turned in the vertical direction.

Claims: An inspection system (10), comprising: a leaking liquid inspection apparatus for inspecting a container made of flexible material, in order to detect leaking liquid; an entering air inspection apparatus for inspecting said container, in order to detect air, which air enters in the contents of the container when the container is fed with such contents; a conveyor line (12) for conveying a plurality of containers; a first sampling means (14) for moving the container as an inspection subject to a position, at which position said leaking liquid inspection apparatus is provided; a second sampling means (16) for moving the container as an inspection subject to a position, at which position said entering air inspection is provided; a first stopper means (18) for interrupting the container to be the inspection subject at the position of said first sampling means (14) while the container is moving on said conveyor line; a second stopper means (20) for interrupting the container to be the inspection subject at the position of said second sampling means (16) while the container is moving on said conveyor line; and a third stopper means (22) located upstream of said first and second stopper means. The inspection system according to Claim 1, wherein each of said first and second sampling means (14, 16) includes an arm (40, 42), an article hold means (44, 46) provided at the end of said arm, a horizontally moving means for moving said arm and said article hold means in a horizontal direction, and a vertically turning means for semicircularly turning said arm in a vertical plane, said arm and said article hold means being moved close to and away from the container by said horizontally moving means, the container being moved in a held state in said article hold means, by combinedly operating said horizontally moving means and said vertically turning means. The inspection system according to Claim 2, wherein said horizontally moving means includes: a pair of rails (26, 28), the longitudinal direction of which corresponds to the movement direction of said horizontally moving means, a movable pedestal (36, 38) reciprocating on the rails, and a piston cylinder system, by means of which said movable pedestal is reciprocated. The inspection system according to Claim 1, wherein each of said first and second sampling means (14, 16) has an arm (40,42), an article hold means (44, 46) provided at the end of said arm, a piston cylinder system provided at the end of said arm to move said article hold means in a horizontal direction, and a vertically turning means for semicircularly turning said arm holding the container with said article hold means in a vertical plane. The inspection system according to any one of Claims 2, 3 or 4, wherein; an inspecting position of said leaking liquid inspection apparatus corresponds with a position of the container, to which position the container has been semicircularly moved from said conveyor line by means of said vertically turning means of said first sampling means (14), and an inspecting position of said entering air inspection apparatus corresponds with a position of the container, to which position the container has been semicircularly moved from said conveyor line by means of said vertically turning means of said second sampling means (16). The inspecting system according to any preceding Claim, further comprising a control means which controls said first and second sampling means (14, 16), said first, second and third stopper means (18, 20, 22), so as to cause them to cooperate together and to make the article conveyed on the conveyor be subject to the leaking liquid inspection and the entering air inspection.

Inventors: IWAO KENJI, MOCHIZUKI HIROSHI, IWAO, KENJI, MOCHIZUKI, HIROSHI
Applicants: YAKULT HONSHA KK, KABUSHIKI KAISHA YAKULT HONSHA
Application year: 1995
Main classification: G01M3
IPC codes: B65B57, G01M3, A23C9