Container filling apparatus

Abstract: A container filling apparatus is improved in order to make it possible to discharge liquid stagnating within a filling valve. The filling valve is lowered towards a container (134) being conveyed, then a liquid passageway gating section (181) is opened by pressing a bell (140) of the filling valve against the container (134), and thereby liquid is filled in the container (134). A net content is adjusted by vertically moving at least one of a filler liquid tank (132) and a stopper member (225) of an intermediate spring bracket (220) of a second elastic body (221) for upwardly biasing a valve body with respect to a loading table of the container (134). In addition, it is possible to open the liquid passageway gating section (181) by lowering the filling valve with an external force, and so, liquid stagnating in the flow passageway (110) of the filling valve can be discharged.

Description: BACKGROUND OF THE INVENTION: Field of the Invention: The present invention relates to a container filling apparatus according to the preamble of claims 1 and 3, and described in J.P-U-58-15359 for filling liquid or the like in a container. Description of the Prior Art: Heretofore, with regard to a method and an apparatus for adjusting a net content of an amount to be filled in an empty container, description has been made in the Official Gazette of Japanese Utility Model Publication No. 58-15359 (1983). With this apparatus, adjustment of a net content is carried out by manipulation of a presser nut and a pad presser provided at an end portion of a liquid pouring pipe for filling liquid in a container. Also, in the prior art, as a container filling apparatus, an apparatus disclosed in the Official Gazette of Japanese Utility Model Publication No. 60-145 (1985) has been publicly known. The disclosed container filling apparatus is an apparatus, in which containers are conveyed in the horizontal direction, while a filling valve is made to descend, and pressed against a container, and liquid is filled in the container by opening a liquid passageway gating section. However, the aforementioned former apparatus for adjusting a net content in the prior art involved the following problems. That is, in the case of filling containers at a high speed, a large number of filling apparatuses are arrayed in a ring shape. Consequently, in the case of changing a net content in correspondence to different containers, it is necessary to carry out manipulation of a presser nut and a pad presser for all the filling apparatuses, and so, a working efficiency is poor. Also, the aforementioned latter container filling apparatus in the prior art, is an apparatus of such type that while containers are conveyed horizontally, a filling valve is made to descend and pressed against the container, thereby a liquid passageway gating section is opened and liquid is filled in the container, and is not an apparatus containing a mechanism for draining liquid within a container filling apparatus. SUMMARY OF THE INVENTION: It is therefore one object of the present invention to provide an improved container filling apparatus, in which the above-described disadvantages in the prior art can be eliminated. According to a first feature of the present invention, there is provided a container filling apparatus; comprising a hollow housing communicating with a filler liquid tank and fixedly secured to the bottom of the aforementioned filler liquid tank; a vent tube erected within the above-mentioned housing; a valve body mounted movably with respect to the above-mentioned housing, having a passageway formed therein for introducing the liquid in the above-mentioned filler liquid tank into a container, and said valve body being fixedly secured to the aforementioned vent tube; a liquid valve connected to the above-mentioned valve body via a first elastic body, mounted movably with respect to the valve body, forming a filler liquid flow passageway jointly with the outer surface of the above-described vent tube, and butting against the end portion of the vent tube to form a gating valve; a bell connected to the aforementioned liquid valve via a third elastic body, mounted movably to the liquid valve, and having a container seal member to seal the gap between the liquid valve and the bell; an intermediate spring bracket of a second elastic body for biasing the above-mentioned valve body upwards; elevator means capable of elevating, lowering and downwardly biasing the valve body; a stopper member for the aforementioned intermediate spring bracket; and driving means capable of vertically moving at least one of the above-mentioned filler liquid tank and the above-mentioned stopper member with respect to a loading table of containers. According to a second feature of the present invention, there is provided a container filling apparatus; comprising a hollow housing communicating with a filler liquid tank and fixedly secured to the bottom of the aforementioned filler liquid tank; a vent tube erected with the above-mentioned housing; a valve body mounted movably with respect to the above-mentioned housing, having a passageway formed therein for introducing the liquid in the above-mentioned filler liquid tank into a container, and said valve body being fixedly secured to the aforementioned vent tube; a liquid valve connected to the above-mentioned valve body via a first elastic body, mounted movably with respect to the valve body, forming a filler liquid flow passageway jointly with the outer surface of the above-described vent tube, and butting against the end portion of the vent tube to form a gating valve; a bell connected to the aforementioned liquid valve via a third elastic body, mounted movably to the liquid valve, and having a container seal member to seal the gap between the liquid valve and the bell; an intermediate spring bracket of a second elastic body for biasing the above-mentioned valve body upwards; elevator means capable of elevating, lowering and downwardly biasing the valve body; a stopper member for the aforementioned intermediate spring bracket; the fourth elastic body for downwardly biasing the above-mentioned valve body; a float mounted to the bottom portion of the above-mentioned fourth elastic body; and a float stopper member for restricting a lowered position of the above-mentioned float; and in that at least one of the above-mentioned filler liquid tank and the above-mentioned stopper member is constructed so as to be vertically movable with respect to a loading table of containers. According to the first-featured invention above, in the case where a container is not present on a loading table, a vent tube is biased downwards via a valve body by a downward biasing action of elevator means. On the other hand, a liquid valve is moved with respect to the valve body via a first elastic body and butts against an end portion of the vent tube, and thus the condition where the so-call gating valve is closed, is realized. When an arm member rises, the liquid valve initially butts against an intermediate spring bracket, and thereafter it rises jointly with the intermediate spring bracket. In addition, even after the liquid valve has butted against the intermediate spring bracket, the liquid valve is downwardly biased by the sum of the resilient forces of a first elastic body and a second elastic body, hence the liquid valve butts against the end portion of the vent tube, and the gating valve is held in a closed condition. On the contrary, in the case where an empty container is present on the loading table, if the arm member lowers, since the intermediate spring bracket butts against a stopper member and is stopped to lower, the resilient force of the second elastic body becomes not to act as a force for lowering the liquid valve, and the liquid valve stops its movement in the downward direction. On the other hand, since the vent tube moves in the downward direction, it is disengaged from the liquid valve, and the so-called gating valve becomes an opened condition. As a result, the filler liquid in the filler liquid tank is filled in the container through the inside of the housing, the passageway and the filler liquid flow passageway. Adjustment of a net content of the container is effected by means of a driving device which can vertically move at least one of the filler liquid tank and the stopper member for the intermediate spring bracket. In other words, the adjustment is effected by changing the positional relationship between the top of the container and the bottom of the liquid valve through change of the position of the stopper member or the filler liquid tank with respect to the loading table. According to the second-featured invention above, in the case where a container is not present on a loading table, a vent tube is biased downwards via a valve body by a downward biasing action of elevator means. On the other hand, a liquid valve is moved with respect to a valve body via a first elastic body and butts against an end portion of the vent tube, and thus the condition where the so-called gating valve is closed, is realized. When an arm member rises, the liquid valve initially butts against an intermediate spring bracket, and thereafter it rises jointly with the intermediate spring bracket. In addition, even after the liquid valve has butted against the intermediate spring bracket, the liquid bracket is downwardly biased by the sum of the resilient forces of a first elastic body and a second elastic body, hence the liquid valve butts against the end portion of the vent tube, and the gating valve is held in a closed condition. On the contrary, in the case where an empty container is present on the loading table, if the arm member lowers, since the intermediate spring bracket butts against a stopper member and is stopped to lower, the resilient force of the second elastic body becomes not to act as a force for lowering the liquid valve, and the liquid valve stops its movement in the downward direction. On the other hand, since the vent tube moves in the downward direction, it is disengaged from the liquid valve, and the so-called gating valve becomes an opened condition. As a result, the filler liquid in the filler liquid tank is filled in the container through the inside of the housing, the passageway, and the filler liquid flow passageway. In addition to the above-described operations, according to the second-featured invention above, liquid stagnating within the valve body can be drained in the following manner by opening the liquid passageway gating section with an external force. At first, under a free condition where an external force does not act upon the filling valve, the valve body is subjected to an upward force by the second elastic body, and also subjected to a downward force by the fourth elastic body. Here, since the downward force acted by the fourth elastic body is larger than the upward force acted by the second elastic body, the valve body is held still with the float integrally connected to the bottom of the fourth elastic body butting against a float stopper member. Under this condition, the stopper member is not held in contact with a central flange of the liquid valve which is urged downwards by the first elastic body. Consequently, the liquid passageway gating section is held closed by the action of the first elastic body. Next, an external force larger than the upward force exerted upon the valve body by the second elastic body, is applied in the downward direction to the valve body. Then, the valve body moves downwards, hence the central flange of the liquid valve butts against the stopper member, and if the valve body is allowed to descend further, the vent tube fixedly secured to the valve body would descend with respect to the liquid valve, therefore the liquid passageway gating section becomes opened, and it becomes possible to discharge the liquid stagnating in the liquid passageway. The above-mentioned and other objects, features and advantages of the present invention will become more apparent by reference to the following description of preferred embodiments of the invention taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS: In the accompanying drawings: Fig. 1 is a vertical cross-section view of a container filling apparatus according to a first preferred embodiment of the present invention; Fig. 2 is a horizontal cross-section view showing a detailed structure of an arm member in the same preferred embodiment taken along line A-A in Fig. 1 as viewed in the direction of arrows; Fig. 3 is a schematic view showing successive steps in a filling process of the container filling apparatus according to the same preferred embodiment; Figs. 4 to 8 are schematic cross-section views of the container filling apparatus according to the same preferred embodiment to be referred to for explaining the successive steps of the container filling process; Fig. 9 is a vertical cross-section view of a container filling apparatus according to the same preferred embodiment but employing different elevator means; Fig. 10 is a vertical cross-section view of a container filling apparatus according to a second preferred embodiment of the present invention, which shows a free condition where an external force is not exerted; Fig. 11 is a vertical cross-section view of the same container filling apparatus, which shows a liquid draining condition of the apparatus; Fig. 12 is a horizontal cross-section view taken along line A-A in Fig. 10 as viewed in the direction of arrows; Fig. 13 is a schematic view showing successive steps in a filling process of the container filling apparatus according to a second preferred embodiment of the present invention; Fig. 14 is a schematic view showing detailed structures of the container filling apparatus according to the second preferred embodiment at the successive steps in the filling process; Fig. 15 is a vertical cross-section view of a container filling apparatus according to a third preferred embodiment of the present invention, which shows a free condition where an external force is not exerted; and Fig. 16 is a vertical cross-section view of the same container filling apparatus, which shows a liquid draining condition of the apparatus. DESCRIPTION OF THE PREFERRED EMBODIMENTS: Now, a number of preferred embodiments of the present invention will be described with reference to the accompanying drawings. Fig. 1 shows a vertical cross-section view of a filling apparatus 1, which is arrayed in multiple in a ring-shaped arrangement. A hollow housing 101 is fixedly secured by bolts not shown to a bottom of an annular filler liquid tank 132 provided with a driving device so that it can be vertically moved with respect to a loading table of containers not shown. As the above-mentioned driving device, well-known drive means such as, for example, a rack-pinion mechanism, a screw mechanism or the like can be employed. At the center of the above-mentioned housing 101, a vent tube 156 forming a discharge path is erected with its one end portion projected up to the position of a gas layer in the filler liquid tank 132 and the other end portion formed in a tapered opening shape and placed at the position butting against a liquid valve 144 as will be described later to form a gating valve for filling the filler liquid in the container. A hollow valve body 104 is coaxial with the above-mentioned housing 101, and also it is movable with respect to the housing 101 while maintaining air-tightness therebetween. While the valve body can be formed either in an externally fitting shape or in an internally fitting shape, in this particular embodiment it has an internally fitted slidable configuration, and at the other end portion it is formed with a flange 109 for pinching an elastic body 108 as will be described later. It is to be noted that in the case of a vacuum filling machine in which the gas pressure in the filler liquid tank 132 is made a negative pressure, the seal between the housing 101 and the valve body 104 could be such degree of seal that leakage may not occur under the particular negative pressure. This valve body 104 is fixedly secured to the vent tube 156 to form an integral body. It is to be noted that in the valve body 104 is formed a liquid passageway 105 serving as a passageway for introducing the liquid in the above-mentioned filler liquid tank via the hollow housing 101, and a filler liquid passageway 110 is formed by an outer surface of the vent tube 156 and the valve body 104. While it will be described later in detail, in order to form an elevator means for vertically moving the valve body 104 with respect to the housing 101, the valve body 104 is connected to a pair of arm members 350 via a pin shaft 136 which is slidably fitted to elongated holes 355 in the arm members 350 and serves as a coupling member. Although the hollow-shaped liquid valve 144 could be formed movably with respect to the valve body 104 while air-tightness therebetween, that is, either in an externally fitted shape or in an internally fitted shape, in this particular embodiment, it is slidably mounted as fitted internally, and a first elastic body 108 is interposed between a flange 109 formed on the above-mentioned valve body 104 and a central flange 226 of the liquid valve 144. It is to be noted that in the case of a vacuum filling machine in which the gas pressure in the filler liquid tank 132 is made a negative pressure, the seal between the valve body 104 and the liquid valve 144 could be such degree of seal that leakage may not occur under the particular negative pressure. In addition, a second elastic body 221 is mounted between the flange 109 and an intermediate spring bracket 220 which is annular and has its inner circumferential surface is guided as held in contact with an outer circumferential surface of the central flange 226 of the liquid valve 144. It is to be noted that the resilient force of the second elastic body 221 could be received by the housing 101 or the arm members 350 in place of being received by the flange 109. Also, while the stopper member 225 of the intermediate spring bracket 220 could be installed so as to be vertically movable as driven by a driving device not shown, in this preferred embodiment, since the filler liquid tank 132 is vertically movable, it is fixedly secured to a guide 361 which will be described later. To the outer circumferential portion of the liquid valve 144 is externally and slidably fitted a bell 140 via that liquid valve 144 and a third elastic body 223, and they are sealed. In addition, the above-mentioned liquid valve 144 is mounted so as to be able to butt against the intermediate spring bracket 220. It is to be noted that the bell 140 is formed with a positioning tapered surface 137 which is narrowed from its bottom end towards the inner direction so that a container can be easily inserted. At the inner end portion of this positioning tapered surface 137 is disposed a seal member 138 serving as sealing material for a container. It is to be noted that containers 134 (See Fig. 3) are placed on a horizontal loading table not shown which is fixed with respect to a filling machine main body, and they are constrained by a guide section disposed in a semi-circular array at such positions that they are centered with respect to the filling apparatus 1. Next, description will be made on a structure for vertically moving the valve body 104 with reference to also Fig. 2 (a cross-section view taken along line A-A in Fig. 1). In a central outside surface portion of the valve body 104 is provided a pin shaft 136 for vertically moving the valve body 104 with respect to the housing 101, this pin shaft 136 is slidably fitted in elongated holes 355 of the arm members 350, the arm members 350 are provided with a roller 351 at one end and also a pin 352 at the other end, and this pin 352 is rotatably supported by a support arm 353 fixedly secured by bolts to the bottom surface of the filler liquid tank 132. It is to be noted that the pin shaft 136 has a rotary lock plate 137 for stopping rotation of the valve body 104 fitted thereto. At the position between the above-described elongated holes 355 of the arm members 350 and the above-mentioned pin 352, an elastic body 354 for biasing the arm members 350 is interposed between the arm members 350 and the support arm 353, and the bottom end of the elastic body 354 is supported via a washer 357 from the arm members 350. On the other hand, a guide 361 fixedly secured to the housing 101 as hanging therefrom is disposed at a position between the elongated hole 355 of the arm member 350 and the above-mentioned roller 351, and at the bottom end portion of this guide 361 is provided a stopper member 363 for limiting the lowered position of the arm member 350. In addition, as shown in Fig. 1, there is provided a control cam 360 adapted to butt against the above-mentioned roller 351 for vertically moving the valve body 104 via the arm members 350. Next, operations of the above-described construction will be explained with reference to Figs. 3 to 8. Fig. 3 is illustration of the successive steps in the filling process of a rotating filling apparatus according to the first preferred embodiment of the present invention, in which containers 134 are conveyed while being held at a constant level, and filling is effected sequentially in the direction indicated by an arrow B. Station 1 ○ in Fig. 3 is a position where a filling step has been finished and a valve body 104 and a vent tube 156 are about to be raised, and at this position the valve body 104 is moved upward by the roller 351 rolling along the control cam 360. Station 2 ○ is a position where the valve 104 has been raised up to the uppermost position by the roller 351 rolling along the control cam 360, and the container 134 is ejected. Next station 3 ○ is a position where a container 134 fed externally of the filling apparatus is ready to be filled with filler liquid, and the valve body 104 moves downwards as controlled by the control cam 360 and the roller 351. Fig. 4 is a cross-section view showing the state where a container 134 is not present and arm members 350 omitted from illustration have lowered, that is, the arm members 350 are butting against the stopper member 363. This figure also shows the state where the arm members 350 have lowered to a maximum extent and the elastic body 354 has stretched, and the vent tube 156 has also lowered jointly with the lowering of the arm members 350. On the other hand, the liquid valve 144 is biased downwards by the first elastic body 108, hence the liquid valve 144 butts against the end portion of the vent tube 156, and the so-called gating valve is held in a closed condition. Fig. 5 is a cross-section view showing the state where the arm members 350 are raised. When the apparatus shifts from the state shown in Fig. 4 to the state shown in Fig. 5, as the arm members 350 rises the liquid valve 144 initially butts against the intermediate spring bracket 220, and thereafter they rises jointly with the intermediate spring bracket 220. Even after the liquid valve 144 has butted against the intermediate spring bracket 220, the liquid valve 144 is downwardly biased by the sum of the resilient forces of the first elastic body 108 and the second elastic body 221, and the gating valve is held in a closed condition with the liquid valve 144 butting against the end portion of the vent tube 156. Next, Fig. 6 shows the state at the moment when the arm members 350 lower and the container 134 has butted against the seal member 138. It is to be noted that at this time also, the gating valve is held in a closed condition by the sum of the resilient forces of the first elastic body 108 and the second elastic body 221. Fig. 7 shows the state at the moment when the arm members 350 lower and the intermediate spring bracket 220 has butted against the stopper member 225. During the period when the apparatus shifts from the state shown in Fig. 6 to the state shown in Fig. 7, since the sum of the resilient forces of the first elastic body 108 and the second elastic body 221 is chosen larger than the resilient force of the third elastic body 223, the liquid valve 144 is urged against the end portion of the vent tube 156, and thereby a closed condition of the gating valve is maintained. And, the valve body 104, the vent tube 156 and the liquid valve 144 are integrated and move together downwardly against the bell 140 which is prevented from moving downward by the container 134, and the third elastic body 233 is compressed. Starting from the state shown in Fig. 7, if the arm members 350 lower further, since the intermediate spring bracket 220 is prevented from lowering as butting against the stopper member 225, the resilient force of the second elastic body 221 becomes not to act as a force for lowering the liquid valve 144. At this time, since the resilient force of the third elastic body 223 is chosen larger than the resilient force of the first elastic body 108, the liquid valve 144 stops to move downwards. On the other hand, since the vent tube moves downwards, it is disengaged from the liquid valve 144, hence a gap space 180 is produced, and the valve becomes an opened condition. Lowering of the arm members would stop at the state where the arm members 350 have butted against the stopper member 363, and the apparatus takes the state shown in Fig. 8. As a result, the filler liquid within the filler liquid tank 132 flows through the passageway 105 and the liquid passageway 110 into the container 134. On the other hand, air within the container 134 is discharged to the gas layer of the filler liquid tank 132 through a discharge path 157 formed in the vent tube 156, and thereby a predetermined amount of liquid can be filled in the container. It is to be noted that the resilient force of the elastic body 354 is chosen larger than the sum of the resilient forces of the second elastic body 221 and the third elastic body 223, and so, even in the event that the container 134 is present, the arm members 350 can be lowered up to the position where they butt against the stopper 363. Next, the state where filling has been completed corresponding to the station 1 ○ shown in Fig. 3, and starting from this state, the arm members 350 are raised by the control cam 360 and the roller 351. Accompanying the rising-motion, the valve body 104 as well as the vent tube 156 connected to the valve body 104 would rise. However, because of the fact that the resilient force of the third elastic body 223 is chosen larger than the resilient force of the first elastic body 108, the intermediate spring bracket 220, the liquid valve 144 and the bell 140 would not move. And the tip end portion of the vent tube 156 butts against the liquid valve 144, and the apparatus returns to the state shown in Fig. 7, wherein the gating valve takes a closed condition. If the arm members 350 rise further, the intermediate spring bracket 220, the liquid valve 144 and the vent tube 156 would integrally move in the upward direction because of the fact that the sum of the resilient forces of the first elastic body 108 and the second elastic body 221 is chosen larger than the resilient force of the third elastic body 223. At this time, the liquid valve 144 rises with respect to the bell 140, and passing through the state at the moment when the seal member 138 is disengaged from the container 134 (Fig. 6), the state of the station 2 ○ shown in Fig. 3, that is, the state shown in Fig. 5 is realized. Next, explaining about the adjustment of a net content depth, as shown in Fig. 7 the net content depth is determined by the bottom end position of the liquid valve 144 and the position of the container 134 butting against the seal member 138 (dimension a in Fig. 7). More particularly, when filler liquid is filled in the container 134, while the air within the container 134 is discharged through the vent tube 156 into a gas layer in the filler liquid tank 132, since the air in the portion of the dimension a shown in Fig. 7 cannot escape, the above-mentioned dimension a determines the net content depth. Accordingly, as a method for changing the dimension a in the case of varying a net content depth, it is only necessary to change a thickness of the seal member 138, to change the height of the filler liquid tank 132 which determines the position of the bottom end of the liquid valve 144 or the position in the direction of height of the stopper member 225, or to change the height of the loading table for the containers 134 which determines the position of the top ends of the containers 134. In order to change the thickness of the seal member 138, it is necessary to respectively adjust a large number of filling apparatuses (gating valves) disposed in a ring-shaped array as is the case with the prior art. Therefore, in this particular embodiment of the present invention, as a method for adjusting a net content depth without changing the thickness of the above-mentioned seal member 138, a driving device for vertically moving the filler liquid tank 132 which can be installed simply as described above is operated, and thereby adjustment can be effected easily. Or else, by employing a spacer as means for changing the position of the stopper member 225, a similar effect can be achieved. It is to be noted that since the gating valve would not take an opened condition even if the arm members 350 should take the lowered state as shown in Fig. 4, it would never occur that the filler liquid flows out under the condition where containers are not present. In addition, by changing the resilient force of the third elastic body 223, the filling apparatus can be easily adapted to containers having various mechanical strengths, and a container can be filled without being broken. Also, while the elastic body 354 was employed as biasing means for biasing the arm members 350 in the above-described preferred embodiment, the biasing means could be an air cylinder or the like which can vertically move the arm members 350 in correspondence to the control cam 360 as shown in Fig. 9 (a vertical cross-section view of the filling apparatus). In addition, while the above-described valve body 104, liquid valve 144 and bell 140 are movable and formed in a slidable manner for the purpose of seal, they can be formed in a movable manner by means of bellows in which sealing sections a separately formed. Next, a second preferred embodiment of the present invention will be described with reference to Figs. 10 to 14. This second preferred embodiment relates to a container filling apparatus of the type that a net content depth to be filled cam be easily changed. In Figs. 10 and 11, reference numeral 1 designates a container filling apparatus, numeral 132 designates a filler liquid tank of annular shape, which is provided with a driving device capable of vertically moving the filler liquid tank 132 with respect to a container loading table (not shown), and to the bottom of the same filler liquid tank 132 is fixedly secured a hollow housing 101 by means of bolts (not shown). Reference numeral 156 designates a vent tube having a discharge path, the same vent tube 156 is positioned at the center of the inner space of the housing 101, the top end opening portion of the same vent tube 156 is positioned in a gas layer of the filler liquid tank 132, and the bottom end opening portion of the vent tube 156 is formed in a tapered shape. Reference numeral 104 designates a hollow valve body, the same valve body 104 is fitted and inserted in the housing 101 in a slidable manner (so as to be freely raised and lowered) along the inner circumferential surface of the housing 101, and the interstice between these valve body 104 and housing 101 is liquid-tightly sealed. This valve body 104 is integrally mounted to the vent tube 156 via a portion having a liquid passageway 105. And, at the lower portion of this valve body 104 is formed a flange 109. Reference numeral 110 designates a liquid passageway formed between the valve body 104 and the vent tube 156. Reference numeral 144 designates a hollow liquid valve, the upper outer circumferential surface of the same liquid valve 144 is slidably fitted and inserted in the lower inner circumferential surface of the valve body 104, and the interstice between these liquid valve 144 and valve body 104 is sealed in a liquid-tight manner. Reference numeral 226 designates a central flange formed on the outer circumferential surface of the central portion in the vertical direction of the same liquid valve 144, and between this central flange 226 and the above-described flange 109 is interposed a first elastic body 108. Reference numeral 140 designates a bell, and this bell 140 is slidably fitted around the outer circumferential surface of the lower portion of the liquid valve 144. The interstice between these bell 140 and liquid valve 144 is liquid-tightly sealed by means of a seal member. It is to be noted that containers 134 in Fig. 13 are placed on a horizontal loading table (not shown) fixed with respect to a main body of a filling machine, and they are restrained by a semi-circular guide member having its center located at the central portion of the filling apparatus 1. Now, description will be made on a filling valve elevator for vertically moving the valve body 104. Reference numeral 136 in Figs. 10 to 12 designates pin shafts provided on the outer side surface of the central portion of the valve body 104, and these pin shafts 136 are slidably fitted in elongated holes 355 of arm members 350. At one end portions of the same arm members 350 is mounted a roller 351, and at the other end portions of the same arm members 350 is mounted a pin 352. The arm members 350 are rotatably supported by this pin 352 and a support arm 353 fixedly secured to the bottom surface of the filler liquid tank 132. It is to be noted that to the pin shafts 136 are mounted rotary lock plates 137 for the valve body 104. Reference numeral 402 designates a fixed support, this fixed support 402 is positioned between the elongated holes 355 of the arm members 350 and the pin 352, and this fixed support 402 is fixedly secured to the bottom surface of the filler liquid tank 132 via the support arm 353. Reference numeral 408 designates a float stopper member mounted to the bottom end of a lower stem portion of the same fixed support 402, numeral 401 designates a float mounted to the lower step portion of the fixed support 402 in a vertically movable manner, numeral 354 designates a fourth elastic body interposed between the float 401 and the support arm 353, and this fourth elastic body 354 downwardly biases the float 401. Numeral 403 designates a notch formed on the arm member 350, numeral 405 designates an engagement shaft to be engaged with the same notch 403, and this engagement shaft 405 is mounted to the lower stem portion of the above-mentioned fixed support 402. Reference numeral 225 designates a stopper member, this stopper member 225 is positioned between the elongated holes 355 of the arm members 350 and the fixed support 402, and this stopper member 225 is fixed to the bottom surface of the filler liquid tank 132. Reference numeral 220 designates an intermediate spring bracket, and this intermediate spring bracket 220 is positioned around the central flange 227 of the liquid valve 144 and is held in contact with the stopper member 225. Reference numeral 221 designates a second elastic body, which is interposed between the intermediate spring bracket 220 and the flange 109 at the lower portion of the valve body 104. Reference numeral 223 designates a third elastic body interposed between the central flange 227 of the liquid valve 144 and the bell 140, and the bell 140 is biased downwards by this third elastic body 223. Reference numeral 360 designates a control cam, which is held in contact with the above-mentioned roller 351, and adapted to vertically move the valve body 104 by making the arm members 350 swing up and down about the pin 352. Next, operations of the above-described container filling apparatus will be explained with reference to Figs. 13 and 14. Fig. 13 is a schematic view for explaining the successive steps of the filling process of a rotating filling apparatus, in which containers 134 are fed to the filling apparatus 1 as maintained at a constant level, and filling of liquid in the containers 134 is effected in the sequence represented by an arrow B in Fig. 13. Station 1 ○ in Fig. 13 is the position where the filling process has been finished and a valve body 104 and a vent tube 156 are about to be raised. The valve body 104 moves upwards as controlled by a control cam 360, a roller 351 and arm members 350. Station 2 ○ in Fig. 13 is the position where the valve body 104 has risen up to the uppermost position and the container 134 is about to be ejected. Station 3 ○ in Fig. 13 is the position where a container 134 externally fed to the filling apparatus 1 is ready to start a filling operation. The valve body 104 moves downwards as controlled by the control cam 360, the roller 351 and the arm members 350. Fig. 14(A) shows the state where a container 134 is not present and the arm members 350 have lowered up to the free condition shown in Fig. 10. At this time, the liquid valve 144 is biased downwards by the first elastic body 108 and butts against the bottom end portion of the vent tube 156, and the filling valve is held in a closed condition. Fig. 14(B) shows the state where, on the contrary, the arm members 350 are rising. When the apparatus transfers from the state shown in Fig. 14(A) to that shown in Fig. 14(B), since the engagement shaft 405 rises while being engaged with the notch 40 as the arm members 350 rise, the float 401 rises as separating from the float stopper member 408. The liquid valve 144 initially butts against the intermediate spring bracket 220 and thereafter it rises jointly with the intermediate spring bracket 220. In addition, even after the liquid valve 144 has butted against the intermediate spring bracket 220, due to the sum of the resilient forces of the first elastic body 108 and the second elastic body 221 the liquid valve 144 butts against the end portion of the vent tube 156, and the filling valve is held in a closed condition. Fig. 14(C) shows the state at the moment when the arm members 350 lower and the container 134 has butted against the seal member 138. At this time also, due to the sum of the resilient forces of the first elastic body 108 and the second elastic body 221 the filling valve is held in a closed condition. Fig. 14(D) show the state at the moment when the arm members 350 further lower and the intermediate spring bracket 220 has butted against the stopper member 225. During the period when the apparatus transfers from the state shown in Fig. 14(C) to that shown in Fig. 14(D), since the sum of the resilient forces of the first elastic body 108 and the second elastic body 221 is chosen larger than the resilient force of the third elastic body 223, the liquid valve 144 is urged against the end portion of the vent tube 156, and the filling valve is held in a closed condition. Then the valve body 104, the vent tube 156 and the liquid valve 14 integrally move downwards with respect to the bell 140 (the bell 140 prevented from moving downwards by the container 134), and the third elastic body 223 is compressed. When the arm members 350 lower further starting from the state shown in Fig. 14(D), the intermediate spring bracket 220 butts against the stopper member 225, and it is prevented from lowering. Consequently, the resilient force of the second elastic body 221 would become not to act as a force for lowering the liquid valve 144. At this time, since the resilient force of the third elastic body 223 is chosen larger than the resilient force of the first elastic body 108, downward movement of the liquid valve 144 stops. On the other hand, since the vent tube 156 moves downwards, it is disengaged from the liquid valve 144, a gap space 180 is produced, and the filling valve takes an opened condition. Lowering of the arm members 350 stops when the float 1 has butted against the float stopper member 408, and the state shown in Fig. 14(E) is realized. As a result, the liquid in the filler liquid tank 132 flows down through the path of the housing 101 → the liquid passageway 105 → the liquid passageway 110, and flows into the container 134. On the other hand, air within the container 134 is discharged to the gas layer in the filler liquid tank 132 through the discharge path 157 within the vent tube 156, and filling of a predetermined amount of liquid into the container 134 is effected. It is to be noted that the torque for rotating the arm members 350 downwards about the pin 352 caused by the resilient force of the elastic body 354 is chosen larger than the torque for rotating the arm members 350 upwards about the pin 352 caused by the sum of the resilient forces of the second elastic body 221 and the first elastic body 108, and so, even in the case where the container 134 is present, it is possible for the arm members 350 to lower up to the position where the float 401 butts against the float stopper member 408. The state where the filling has completed is shown at station 1 ○ in Fig. 13. Starting from this state, the arm members 350 are raised by the control cam 360 and the roller 351. In accordance with the arm members 350, the valve body 104 as well as the vent tube 156 that is integral with the valve body 104 would rise. However, as the resilient force of the third elastic body 223 is larger than the resilient force of the first elastic body 108, the intermediate spring bracket 220, the liquid valve 144 and the bell 140 would not move. Then, the tip end portion of the vent tube 156 butts against the liquid valve 144, resulting in a closed condition of the filling valve, and the apparatus returns to the state shown in Fig. 14(D). If the arm members 350 rise further, since the sum of the resilient forces of the first elastic body 108 and the second elastic body 221 is chosen larger than the resilient force of the third elastic body 223, the intermediate spring bracket 220, the liquid valve 144 and the vent tube 156 integrally move upwards. At this time, the liquid valve 144 rises with respect to the bell 140, and after passing the state at the moment when the seal member 138 is disengaged from the container 134 (See Fig. 14(C)), the apparatus takes the state of the station 2 ○ in Fig. 13, that is, the state shown in Fig. 14(B). Next, description will be made on adjustment of a net content depth. The net content depth is determined by a distance a between the lower end position of the liquid valve 144 and the upper end position of the container 134 butting against the seal member 138 as shown in Fig. 14(D). More particularly, when filler liquid is filled in the container 134, while air within the container 134 is discharged through the vent tube 156 into the gas layer in the filler liquid tank 132, the air in the portion of the distance a shown in Fig. 14(D) cannot escape, and hence this distance a determines the net content depth. Therefore, the net content depth is adjusted by changing the height of the filler liquid tank 132 by means of a driving device for vertically moving the filler liquid tank 132, and thus changing the distance a . Now, description will be made on the case where under the condition that the container 134 is not present, the vent tube 156 is moved downwards with respect to the liquid valve 144, and thereby filler liquid stagnating in the liquid passageway 110 is discharged. Fig. 10 shows the same state as that shown in Fig. 14(A), where a container 134 is not present. Also, this figure shows the roller 351 under a free condition where it is not held in contact with the control cam 360 nor a cam 370. Under this condition, the intermediate spring bracket 220 is not held in contact with the stopper member 225. Consequently, the elongated holes 355 of the arm members 350 are biased upwards via the stopper member 225, the intermediate spring bracket 220, the second elastic body 221, the flange 109 and the pin shaft 146. also the notches 403 of the same arm members 350 are biased downwards via the fourth elastic body 354, the float 401, and the engagement shaft 405. The resilient forces of these fourth elastic body and second elastic body 221 are chosen in such manner that under the above-mentioned condition the torque for biasing the arm members 350 downwards by the fourth elastic member 354 may become larger than the torque for biasing the arm members 350 upwards by the second elastic member 221, and so, the arm members 350 are held stopped under the condition that the float 401 butts against the float stopper member 408 and the engagement shaft 405 butts against the notches 403. Under this condition, the central flange 226 is not held in contact with the stopper member 225 nor the intermediate spring bracket 220. It is to be noted that in Fig. 10, the liquid valve 144 is biased downwards by the first elastic body 108, the liquid valve 104 butts against the end portion of the vent tube 156 to seal the latter, and the liquid passageway gating section 181 is held in a closed condition. Fig. 11 shows a liquid draining condition where a container 134 is not present, but the vent tube 156 is lowered with respect to the liquid valve 144, thus the liquid passageway gating section 181 is held in an opened condition, and the liquid stagnating in the liquid passageway 110 is discharged. This liquid draining condition can be realized by downwardly depressing the roller 351 of the valve elevator held in a free condition shown in Fig. 10 by means of a cam 370 or the like. As the roller 351 of the valve elevator in a free condition shown in Fig. 10 is being depressed, the arm members 350 would swing downwards about the pin 352, and the notches 403 of the arm members 350 would leave the engagement shaft 405. At the same time, the pin shafts 136 are pushed downwards by the elongated holes 355, and consequently, the valve body 104 to which the pin shafts 136 are fixed and the vent tube 156 would move downwards while compressing the second elastic body 221. In addition, by the action of the first elastic body 108, the liquid valve 104 butting against the end portion of the vent tube 156 also would move downwards. When the roller 351 is further depressed downwards, the central flange 226 of the liquid valve 144 comes into contact with the stopper member 225, thereafter the downward movement of the liquid valve 144 stops, and the vent tube 156 further moves downwards while compressing the first elastic body 108. Consequently, the liquid passageway gating section 181 opens, and the liquid stagnating in the liquid passageway 110 is discharged. Under the condition where the liquid passageway gating section 181 has opened, the downward movement of the roller 351 caused by the cam 370 or the like would stop. Therefore, the liquid passageway gating section 181 is held at the opened position. In order to bring the liquid passageway gating section 181 into the closed condition again, it is only necessary to remove the force for depressing the roller 351 downwards by removing the cam 370 or the like. More particularly, starting from the condition shown in Fig. 11, as the force depressing the roller 351 downwards is released, the valve body 104, the pin shafts 136, the arm members 350 and the vent tube 156 are moved upwards by the resilient forces of the first elastic body 108 and the second elastic body 221. At this time, the central flange 227 is urged against the stopper member 225 by the resilient force of the first elastic body 108, and the liquid valve 144 is held stopped. If the depressing force for the roller 351 is further released, the end portion of the vent tube 156 butts against the liquid valve 144, resulting in a closed condition of the liquid passageway gating section 181, thereafter the liquid valve 144 and the vent tube 156 would rise integrally, and the central flange 227 would leave the stopper member 225. The rising motion of the vent tube 156 stops at the position where the notches 403 butt against the engagement shaft 405 and the rise of the arm members 350 stops. At this time, if the force for further depressing the roller 351 is completely removed, while the free condition shown in Fig. 10 is realized, the stop positions of the arm members 350, the vent tube 156 and the other members are not changed, and the closed condition of the liquid passageway gating section 181 is maintained. Next, a third preferred embodiment of the present invention will be described with reference to Figs. 15 and 16. This third preferred embodiment is not a container filling apparatus of the type that a net content depth can be easily changed as is the case with the above-described second preferred embodiment, but a liquid valve 154 of an integral structure as shown in Figs. 15 and 16 is employed in place of the liquid valve 144 and the bell 140 shown in Fig. 10. As shown in Fig. 15, a second elastic body 221 is provided between a flange 109 and a stopper member 225. Also, this embodiment employs such structure that in the event that a central flange 226 of the liquid valve 154 has moved downwards, it can be stopped by the stopper member 225. Similarly to the second preferred embodiment, in this third preferred embodiment also provision is made such that by depressing a roller 351 under the condition where a container 134 is not present, a vent tube 156 is moved downwards with respect to the liquid valve 154 and filler liquid stagnating in the liquid passageway gating section 181 is discharged. It is to be noted that Fig. 15 shows a free condition where the container 134 is not present, the control cam 360 nor the cam 370 do not act upon the roller 351, and the liquid passageway gating section 181 is held closed. Fig. 16 shows a liquid draining state where under the condition that the container 134 is not present, the vent tube 156 is moved downwards relatively to the liquid valve 154, thereby the liquid passageway gating section 181 is held opened, and filling liquid stagnating in the liquid passageway is discharged. As will be apparent from the detailed description of preferred embodiments of the present invention above, according to the present invention, by adjustably moving at least one of a filler liquid tank or a stopper member, adjustment of a net content depth can be easily effected for a large number of installed filling apparatuses. In addition, even in the case where no container is present, a gating valve would not take an opened condition, and moreover, since the apparatus can be adapted to a mechanical strength of a container by variously selecting resilient forces of elastic bodies, containers can be filled without being broken. Furthermore, the container filling apparatus according to the present invention has the advantage that by lowering a filling valve with an external force to open a flow passageway gating section, liquid stagnating within a liquid passageway of a filling valve can be discharged.

Claims: A container filling apparatus comprising: a hollow housing (101) communicating with a filler liquid tank (132) and fixedly secured to the bottom of said filler liquid tank (132); a vent tube (156) erected within said housing (101); a valve body (104) mounted movably with respect to said housing (101), having a passageway formed therein for introducing the liquid in said filler liquid tank (132) into a container, and said valve body being fixedly secured to said vent tube (156); characterised by a liquid valve (144) connected to said valve body (104) via a first elastic body (108), mounted movably with respect to the valve body (104), forming a filler liquid flow passageway jointly with the outer surface of said vent tube (156), and butting against the end portion of the vent tube (156) to form a gating valve; a bell (140) connected to said liquid valve (144) via a third elastic body (223), mounted movably to the liquid valve (144), and having a container seal member to seal the gap between the liquid valve (144) and the bell (140); an intermediate spring bracket (220) of a second elastic body (221) for biasing said valve body (104) upwards; elevator means (350, 351 and 360) capable of elevating, lowering and downwardly biasing the valve body (104); a stopper member (225) for said intermediate spring bracket (220); and driving means capable of vertically moving at least one of said filler liquid tank (132) and said stopper member (225) with respect to a loading table of containers (134). A container filling apparatus as claimed in Claim 1, characterized in that said elevator means consists of an arm member (350) pivotably secured to the filler liquid tank and connected to the valve body via a pin (136), and a cam (360) for elevating and lowering the same arm member (350). A container filling apparatus comprising : a hollow housing (101) communicating with a filler liquid tank (132) and fixedly secured to the bottom of said filler liquid tank (132); a vent tube (156) erected within said housing (101); a valve body (104) mounted movably with respect to said housing (101), having a passageway formed therein for introducing the liquid in said filler liquid tank (132) into a container, and said valve body being fixedly secured to said vent tube (156); characterised by a liquid valve (144) connected to said valve body (104) via a first elastic body (108), mounted movably with respect to the valve body, forming a filler liquid flow passageway jointly with the outer surface of said vent tube (156), and butting against the end portion of the vent tube (156) to form a gating valve; a bell (140) connected to said liquid valve (144) via a third elastic body (233), mounted movably to the liquid valve (144), and having a container seal member to seal the gap between the liquid valve (144) and the bell (140); an intermediate spring bracket (220) of a second elastic body (221) for biasing said valve body (104) upwards; elevator means (350, 351 and 360) capable of elevating, lowering and downwardly biasing the valve body (104); a stopper member (225) for said intermediate spring bracket (220); the fourth elastic body (354) for downwardly biasing said valve body (104); a float (401) mounted to the bottom portion of said fourth elastic body (354); and a float stopper member (408) for restricting a lowered position of said float (401); and in that at least one of said filler liquid tank (132) and said stopper member (225) is constructed so as to be vertically movable with respect to a loading table of containers (134). A container filling apparatus as claimed in Claim 1, characterized in that the apparatus is constructed in such manner that a liquid passageway gating section (181) can be opened by lowering the valve body (104) and the vent tube with an external force, even if the container (134) is not present.

Inventors: HAYASHI MASAYUKI C O NAGOYA MA, KONDO KATSUHIKO C O NAGOYA MAC, TAKAGAWA HIROYUKI C O NAGOYA M, TANAKA YOSHIHARU C O NAGOYA MA, YAMAGUCHI YUKIO C O NAGOYA MAC, HAYASHI, MASAYUKI, KONDO, KATSUHIKO, TAKAGAWA, HIROYUKI, TANAKA, YOSHIHARU, YAMAGUCHI, YUKIO, Hayashi, Masayuki, c/o Nagoya Mach. Works, Kondo, Katsuhiko, c/o Nagoya Mach. Works, Takagawa, Hiroyuki, c/o Nagoya Mach. Works, Tanaka, Yoshiharu, c/o Nagoya Mach. Works, Yamaguchi, Yukio, c/o Nagoya Mach. Works
Applicants: MITSUBISHI HEAVY IND LTD, MITSUBISHI JUKOGYO KABUSHIKI KAISHA
Application year: 1991
Main classification: B67C3
IPC codes: B67C3