Wrap around caser

Abstract: A wrap around caser including a holding and moving robot is provided. The holding and moving robot holds a predetermined number of bottles (1) collected in a collection station (2) and moves the bottles onto a center section of a blank sheet (5) located at a receiving station and in succession pushes the bottles and the blank sheet downward along a predetermined path defined in a folding station so as to have the blank sheet folded into the shape of a box-shaped case around the bottles. The bottles are not released until they are placed in the box-shaped case so that the casing operation is stable and may be carried out at an increased speed.

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention This invention generally relates to a casing apparatus for placing a predetermined number of containers, such as bottles, in a carton box, and, in particular, to a so-called wrap around caser for placing a predetermined number of containers on a blank sheet which is then folded into a box to have the containers enclosed therein. 2. Description of the Prior Art A wrap around caser is well known in the art and one such example is described in the Japanese Patent Laid-open Pub. No. 59-134122. As shown in this prior patent, in the prior art wrap around caser, articles, such as containers, are transported in a predetermined direction as riding on a conveyor belt and collected in a predetermined arrangement at a collection station. Then, the articles thus collected are moved onto the bottom or central section of a blank sheet which has been located onto a vertically movable table from a magazine housing a stack of blank sheets. The blank sheet typically has a central section, which is generally rectangular in shape and will define the bottom of a box when folded, and a flap section at each side of the central rectangular section, which can be folded to define a side wall of a box when folded. In this case, use may be made of a transport head which grabs the articles temporarily and move them onto the blank sheet. Then, a top pusher is moved downward and brought into contact with the top surfaces of the articles located on the vertically movable table, so that the table and also the articles and blank sheet placed thereon start to move downward. As the table moves downward along a predetermined path, the flap sections of the blank sheet are folded in a predetermined manner to define a box so as to wrap around the articles. In the above-described prior apparatus, however, use is made of separate devices for moving the articles from the collection station onto the blank sheet on the table and for pushing the articles downward along a predetermined path to have the blank sheet folded in a predetermined manner, so that the articles are not continuously held during these steps. In other words, the articles must be set in a free state once they have been placed on a blank sheet on the table. Because of this, the articles are set in a rather unstable condition so that the articles may shift in position or fall down in some cases. This has been a hindrance in increasing the speed in such a wrap around caser. In addition, because of the provision of such separate components along a process line, the overall system tends to be large and provision must be made of a means for synchronizing these separate components, which is not economical. A wrap around caser of the kind defined by the precharacterizing features of claim 1 is known from the DE-B-1 238 836. This known wrap around caser is not suited for holding and moving a plurality of articles but only for moving a single article. In addition thereto this wrap around caser needs a distinct folding station in addition to the holding and moving means for folding the blank sheet around the articles to form a carton box therearound. It is therefore an object of the present invention to provide an improved wrap around caser of the kind defined by the precharacterizing features of claim 1 simple and compact in structure, stable, first and reliable in operation. This object is attained by the characterizing features of claim 1. Advantageous developments of the invention are characterized in the subclaims. Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic illustration showing in perspective view a wrap around caser constructed in accordance with one embodiment of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to Fig. 1, there is schematically shown a wrap around caser constructed in accordance with one embodiment of the present invention. As shown, articles 1 such as bottles are being transported along a predetermined path, for example, by a conveyor belt from a previous station, and the articles 1 are collected in a row at a predetermined spacing at a collection station 2, which is defined at one end of the conveyor belt in the illustrated embodiment. The articles 1 are set in a stand-by state when collected at the collection station 2. The caser also includes a blank sheet supply station 3 where a blank sheet magazine 4 storing a number of blank sheets 5 in the form of a stack is located. As well known in the art, a blank sheet is typically comprised of cardboard in a desired shape and it typically includes a central rectangular or square section, which will define the bottom of a box when the blank sheet has been folded in a predetermined manner, and a flap or side section at each of the four sides of the central rectangular or square section, which can be folded with respect to the central section. Blank sheets 5 may be supplied one by one from the magazine and one such blank sheet 5 is located at a receiving station. In one example, a vertically movable table (not shown) is located at the receiving station and the blank sheet 5 supplied from the magazine 4 is placed on the table when located at the receiving station. Also provided in the caser is a holding and moving robot 6 which generally includes a main body 7, a first arm 8 which is pivotally connected to the main body 7, a second arm 9 which is pivotally connected to the free end of the first arm 8, and a holding head 10 mounted at the free end of the second arm 9. The main body 7 typically contains a controller for controlling the operation of the arms 8 and 9 and also the holding head 10. As well known in the art, the holding head 10 is so structured that it can temporarily hold selected portions, such as mouth portions, of the articles 1 while the articles 1 are moved from one location to another and then release them when the articles have been located at a desired location. A folding station 11 is provided below the receiving station, and the blank sheet 5 is gradually folded into the shape of a box as it moves along a predetermined path defined in the folding station 11 as pushed by the holding head 10 of the holding and moving robot 6. Described more in detail, as well known in the art, a plurality of guide members may be provided in the folding station extending downward from the receiving station such that the flap sections of the blank sheet 5 are brought into contact with such guide members as it descends and gradually folded into the shape of a box to have the articles 1 enclosed therein as the blank sheet 5 is pushed downward along the predetermined path defined in the folding station 11. In this case, the support table (not shown) supports the blank sheet 5 thereon, which, in turn, supports the articles 1 thereon, so that the blank sheet 5 and the articles 1 are securely sandwiched between the support table and the holding head 10 during the descending motion along the folding station 11. When the support table reaches the bottom of the folding station 11, the blank sheet 5 has been folded into the shape of a box so that the containers 1 are now enclosed in a box-shaped case with its top still open. A glue application and closing station 12 is defined downstream of the folding station 11 so that the glue is applied to selected portions of the box-shaped case and the box-shaped case is completely closed. Thereafter, the thus complete case enclosing the articles 1 therein is transported to a desired station. In operation, the articles 1 are transported by a conveyor belt to the collection station 2 where the articles 1 are arranged in a predetermined format and set in a standby state. Then, the holding and moving robot 6 is activated to move the holding head 10 to the collection station 2 through a pivotal motion of the arms 8 and 9 to thereby hold the articles 1 in the collection station, for example, by grabbing selected portions, such as mouth portions, of the articles 1. On the other hand, a blank sheet 5 is supplied from the magazine 4 and placed on a support table (not shown) located at the receiving station. The holding and moving robot 7 is again activated to move its holding head 10 from the collection station to the receiving station so that the articles 1 temporarily held by the holding head 10 are also moved from the collection station to the receiving station. In this case, the articles 1 are located on a central rectangular section, which will later become a bottom of a box when folded, of the blank sheet 5 as illustrated in Fig. 1. It is to be noted that the arrangement of the articles 1 may be varied from one format to another during the movement from the collection station 2 to the receiving station as well known in the art. Upon locating the articles 1 on the blank sheet 5 as described above, the holding head 10 then starts its descending motion along a predetermined path defined in the folding station 11. In one mode of operation, the second arm 9 is caused to pivot counterclockwise in accordance with a signal from the controller in the main body 7 so that the holding head 10 pushes the articles 1 and also the blank sheet 5 downward. Since the support table (not shown) supporting thereon the blank sheet 5 is provided to be movable along a predetermined path when pushed by the holding head 10, the blank sheet 5 and the articles 1 thereon move downward in unison. As they move, the flap or side sections of the blank sheet 5 come into engagement with the guide members (not shown) provided in the folding station 11 so that the flap or side sections of the blank sheet 5 are gradually folded into the shape of a box. Thus, when the blank sheet 5 reaches the bottom of the folding station 11, the flap or side sections of the blank sheet 5 have been folded to substantially enclose the articles 1 in a box with its top still open. Then, the holding head 11 releases the articles 1 now contained in the box-shaped case and moves upward until it clears out of the folding station 11. Thus, the holding head 10 is now ready for next cycle of operation. On the other hand, the box-shaped case enclosing therein the articles 1 is now transported from the bottom of the folding station 11 to the glue application and closing station 12 where glue is applied and the flap or side sections are pressed together so that the box-shaped case is completely closed and discharged out of the caser. In the above-described embodiment, the holding and moving robot 6 has been described to include the main body 7, first arm 8 and second arm 9. However, the present invention should not be limited to such a specific structure. As an alternative structure, the holding and moving robot 6 may include a columnar frame, a fixed support arm extending horizontally from the frame, an X-direction sliding member slidably mounted on the arm, and a Y-direction sliding member slidably mounted on the X-direction sliding member. And, the holding head 10 may be fixedly mounted on the Y-direction sliding member. In this case, the horizontally extending arm is disposed to extend between the collection station 2 and the receiving station so that the X-direction sliding member may move between these stations. And, when the X-direction sliding member is located above the collection station, the Y-direction sliding member is caused to descend so as to allow the holding head 10 to temporarily hold the articles 1 in the collection station 2. Then, the Y-direction sliding member is moved upward to a desired level and then the X-direction sliding member is caused to move to the receiving station where the Y-direction sliding member is caused to move downward to locate the articles 1 on the central rectangular section of the blank sheet 5 and then to move both of the blank sheet 5 and the articles 1 on the blank sheet 5 along a predetermined path in the folding station 11. Although not shown specifically, it should be understood that a main controller is also provided for synchronizing the operation of each of the components provided in the present caser. And, such a main controller is also associated with a controller provided in the main body 7 for controlling the operation of the holding and moving robot 6. The controller provided in the main body 7 may be integrated into the main controller, if desired.

Claims: A wrap around caser, including: a collection station (2) for collecting articles (1), which are being transported by transporting means along a predetermined path, in a predetermined arrangement, said collection station (2) being defined at a predetermined location on said predetermined path; supplying means (3) for supplying a blank sheet (5) of predetermined shape to a receiving station one by one from a storing station (4) which stores a number of blank sheets (5); holding and moving means (6) for holding a predetermined number of said articles (1) at said collection station (2) and for moving said articles (1) onto a predetermined portion of said blank sheet (5) at said receiving station, and a folding station (11) for folding the blank sheet (5) around said articles located on the predetermined portion thereof to have said articles (1) wrapped by said blank sheet (5) with said predetermined portion forming bottom of a carton box formed thereby, characterized in that said holding and moving means (6) is adapted for holding and moving a predetermined number of two or more of said articles (1) at said collection station in a suspended manner and for moving said articles (1) in unison with said blank sheet (5) to a bottom of the folding station (11) located below said receiving station along a predetermined path so as to have said blank sheet (5) folded in a predetermined manner by a descending motion of said holding and moving means (6) to have said articles (1) wrapped by said blank sheet (5) so folded as a carton box about sides of said articles (1) with its top open when reaching the bottom of said folding station (11). The caser of claim 1, wherein said holding and moving means (6) includes a holding head (10) capable of temporarily holding a selected portion of each of said articles (1). The caser of claim 2, wherein said holding and moving means (6) further includes a main body (7), a first arm (8) pivotally mounted with one end thereof on said main body (7), a second arm (9) pivotally mounted with one end thereof on the other end of said first arm (8), said holding head (10) being fixedly mounted on the other end of said second arm.

Inventors: YAMAMOTO HISASHI, YAMAMOTO, HISASHI
Applicants: SHIBUYA KOGYO CO LTD, SHIBUYA KOGYO CO., LTD
Application year: 1992
Main classification: B65B11
IPC codes: B65B11, B65G47, B65B5