JP3753941B2 - Device for opening tubular bag body - Google Patents

Description

[0001]
The present invention relates to a device for opening a tubular bag body that is open at at least one end, the device comprising at least one slide, the slide being at least on a wall of the bag body. In order to at least partially fold one end region, it can be introduced between the walls of the bag body into one open end of the bag body, the at least one slide being a means for reciprocating each slide Can be moved into and out of the end of the bag body to be opened.
[0002]
Bag manufacture usually provides tubular material obtained either by manufacturing a web of tubular material or by joining the longitudinal edges of a flat material web to obtain a tubular shape. To cut the tubular material and to appropriately fold and close one end of the bag body to obtain a bag body of the appropriate length. Bags with a rectangular bottom made by this method are usually called box-type bags by experts in the field. In order to form the bottom of such a box-type bag, the end of one of the two walls of the bag body (one on the other of the flattened bag body) is placed on the bag Folds along a fold line running transversely to the longitudinal axis of the body, so that the end of the bag body has two parallel seams facing each other and 2 facing each other The pair of parallel fold edges takes a hexagonal fold shape. By folding the two seams towards each other and securing the folding lobe containing the seams to each other or to the covering sheet, the bag body is given a rectangular shaped bottom when the finished bag is folded separately. It is done. It is also possible to apply a valve seat before folding the seams towards each other, which valve seat takes the form of a tube when the end of the bag body is folded into its final shape.
[0003]
Two systems are currently known substantially for folding the open end of the bag body in such a way as to form the bottom of a box-type bag. Experts say that this fold is usually referred to as “opening” the bag body.
[0004]
The first known system has a continuously movable, unfolding mechanism, but this mechanism is easily damaged and requires extensive adjustment and reconditioning operations.
[0005]
The second system has an intermittently movable conveyor belt on which the bag body (its longitudinal axis is oriented transversely to the carrying direction) is to the station that opens. Then, the conveyor belt stops. At the opening station, the seam at the end of the bag body to be opened is pulled somewhat apart and mounted so that it can move laterally but is immobile in the other direction The slider moves into the end of the bag body and folds part of the upper wall of the bag body back, resulting in the hexagonal folded shape described above. A folding line (along this, the slider folds the wall of the bag body) is defined by the girder. The girder is arranged above the bag body in the direction of the bag body transfer, and when the belt is stopped, the girder descends onto the bag body to hold the bag body and at the same time the slider in the bag body moves across the girder To do. After folding is complete, the slider retracts, the girder rises, and the conveyor belt may continue its movement with the folded bag body. The slide reciprocates in a substantially horizontal plane (which corresponds to the horizontal plane of the bag body on the conveyor belt) by a pneumatic system having a piston and a cylinder. The disadvantage of this assembly is that intermittent operation is necessary, mainly because the bag body must remain stationary during the entire movement of the slide, which leads to high wear and high energy consumption. Lies in the fact that it also causes the production rate to be limited. Further disadvantages of this known system will be discussed later in the description of the invention in the specification.
[0006]
Another conventional device is described in German Patent Application No. 1.511.021, which is a method for manufacturing a cross bottom to a length from a tubular material to form a cross bottom bag. And an apparatus are disclosed. This continuously operating device has a slide guided along a track path with several sections parallel to the direction of bag body transport, and the slide and the bag body move at the same speed. In order to be able to introduce the slides into the open end of the bag body, they are guided for at least some time along a path inclined with respect to the horizon, the path being in the form of a guide bar, The slide goes against it against the control roller.
[0007]
The present invention overcomes the disadvantages of the current state of the art, is robust, reliable and requires little maintenance, and allows for a production rate much faster than that of currently known systems. Equipment.
[0008]
These advantages are achieved by a device of the type described above, wherein the means for reciprocating each slide has at least one engaging member , which can be moved along a predetermined path, and the slide Is engaged so as to move back and forth. The device, apart from the reciprocating movement of the slide, is in rotational motion with considerably lower wear and lower drive energy compared to the translation as used, for example, in the device of German Patent Application No. 1.511.021. This configuration according to the invention is particularly suitable for continuous operation since it depends mainly on.
[0009]
In a preferred embodiment of the present invention, the at least one engagement member is mounted on a drive chain or belt that travels around a wheel or pulley, the wheel being connected to a first track path section, bag approaching the bag body. A second track path section away from the body and a third track path section forming an engagement member return section are defined. A fourth track path section having a substantially constant distance to the bag body end to be opened may be provided between the first track path section and the second track path section. The engaging member moving in the first track path section moves the slide associated therewith into the open end of the respective bag body, while the engaging member reaches the second track path section. Sometimes retract the slide. The fourth track path section serves the purpose of placing the slide in a rest position with respect to the bag body for a predetermined period of time, during which additional process steps may be performed on the bag body.
[0010]
Advantageously, the position of at least one of the wheels or pulleys that are the means for reciprocating each slide is adjustable so that the order can be changed as each slide moves. .
[0011]
An advantageous embodiment of the invention is characterized in that each slide has a guide path for sliding engagement with the engaging member . The guide path of each slide for sliding engagement with the engaging member is preferably a U-beam with an open end fixedly attached to the slide, the longitudinal axis of which is the reciprocating direction of the slide It is oriented at a right angle to.
[0012]
Although the slide may be fixedly mounted to the actuation station, the full range of advantages of the present invention are exploited as long as the slide itself moves in line with the bag body to be opened. Accordingly, the preferred embodiment further provides a conveyor device for transporting the bag body and a drive device for moving the slide along the track path, along the drive device of the conveyor device and the track path. The drive device for moving the slide is synchronized with each other so that the speed of movement of the bag body on the conveyor device (arrow A) during operation is the speed of the slide along the track (arrow C). Is substantially the same.
[0013]
In order to take advantage of the system's advantages, it is basically desirable to place at least two slides equidistant from each other along the trajectory path. Otherwise, in order to give the slide sufficient time to return to the initial position in the trajectory path, a long distance would have to be maintained between the individually transferred bag bodies. Providing multiple slides also makes it almost irrelevant how long it takes each individual slide to open the bag body. This is because this time is divided by the total number of slides used and can therefore be shortened arbitrarily.
[0014]
In order to be able to use several moving slides that are equidistant from each other along a track along with a common engaging member , the speed of the chain or belt with the engaging member is the speed of the slide along the track path. It is adjusted to be faster than the speed.
[0015]
A drive device for moving a slide along a track path has a chain that runs around a gear wheel or a belt that runs around a pulley, the chain or belt being connected to the slide and a motor Advantageously, it is connected to at least one gear wheel or pulley driven by.
[0016]
In the device according to the invention for opening the tubular bag body, the minimum energy consumption and the minimum wear are continuously operated like the drive device of the conveyor device or the drive device for moving the slide along the track. This is achieved by using a driving device.
[0017]
The track path for the slides may be defined by rails mounted such that each slide is slidable. Advantageously, the device for slidably mounting the slide on the rail has a bush and a shaft slidable there, either of which engages the rail by means of a roller or a sliding surface. And a shaft or bush is connected to the slide.
[0018]
For known systems, the slide usually consists of a plate that must be replaced as a whole whenever the size of the bag body changes, but for opening the bag body according to the invention. A further embodiment of the device provides each slide having a cross beam and at least two slide fingers (preferably adjustable for their mutual distance and length) attached thereto. Depending on the desired dimensions of the bottom of the bag, they are about their distance (thus defining the longitudinal edge of the bottom) and their length (thus defining the width of the bottom as the slide moves). Adjusted. Therefore, there is no need to replace the slide when changing the size of the bag body.
[0019]
As described above, the current state of the art is that the slide and the bag body are in the same plane. This has the undesirable effect that when the bag body is opened by sliding, up to four material layers overlap when the bag body is folded, but only one layer at another. . This thickness difference creates substantial problems during further processing of the bag body. The present invention also provides a solution to that problem, according to one embodiment, wherein the bag body is arranged in a laterally folded manner on a conveyor device for the back body, from the lateral fold line. The bag body portion extending in the direction toward the slide is substantially in the plane of reciprocation of the slide, while the bag body portion extending in the direction away from the slide from the lateral fold line is the plane of reciprocation of the slide. And lie in a plane that forms an angle (preferably approximately a right angle). This method ensures that, after folding, at most two bag body material layers are in overlap.
[0020]
The invention will now be described by way of example with reference to the drawings. Here, FIG. 1 shows a schematic side view of one embodiment of an apparatus for opening a tubular bag body according to the present invention, and FIG. 2 shows a schematic plan view of the same apparatus. The conveyor belt as well as the bag body is omitted in FIG.
[0021]
The following description refers simultaneously to FIGS. 1 and 2 unless otherwise stated clearly. The device for opening a tubular bag body according to the invention shown in the figure has a conveyor belt 1 on which the bag bodies 2, 2a are fastened by suitable means (for example vacuum). ing. The conveyor belt continuously moves in the direction of arrow A at a constant speed. With the exception of the end to be formed at the bottom of the bag, the bag body is in a horizontal state on the conveyor belt and its longitudinal axis is transverse to the transport direction A. The end of each bag body 2, 2a is folded vertically downwards and hung above one of six slides, generally designated 3 (in FIG. 1, for clarity) Only two slides are shown).
[0022]
The slide 3 is slidably attached to a rail 4, which has two opposing straight sections 4a, 4b connected to each other at the ends by two semicircular sections 4c, 4d. Sliding engagement of each slide 3 with the rail 4 is accomplished by four rollers 31, two of which engage one of the two opposing longitudinal edges of the rail 4, respectively. The roller 31 is rotatably attached to the front surface of the slide head 33, and a shaft 34 extends downward from the opposite surface. The bush 35 is slidably mounted on the shaft 34. This bush 35 carries a guide path in the form of a horizontal U-beam 38 with an open end and a cross beam 39 from which slide fingers 36, 37 in the form of thin rectangular plates are mutually connected. It extends vertically upward with a gap. The slide fingers may be attached to the cross beam 39 so as to be adjustable. The U beam 38 and the cross beam 39 may also be formed as an integral unit.
[0023]
Below the semicircular sections 4c, 4d of the rail 4 and concentrically therewith are arranged two wheels 5, 6 having vertical rotation axes 5a, 6a. At least one wheel is driven by a motor (not shown). Both wheels 5, 6 are surrounded by a chain 7, which moves in the direction of arrow C. The speed of the chain 7 is the same as the speed of the conveyor belt 1. The chain 7 is firmly connected to the projection 32 of each slide, thereby pulling the respective slide 3. The slides 3 are equally spaced along the chain 7 so that the distance between the two slides along the rail 4 is equal to the distance between the two bag bodies on the conveyor belt. Appropriate control further ensures that each slide faces one bag body on the conveyor belt 1 during movement along the section 4 a of the rail 4.
[0024]
A separate drive is provided to achieve movement of the bushing 35 and thereby movement of the slide fingers 36, 37 along the shaft 34. This drive device is composed of a chain 8 that travels around four wheels 10, 11, 12, 13 having a horizontal axis of rotation. At least one of the four wheels is driven so that the chain 8 moves in the direction of arrow B at a speed higher than the speed of the conveyor belt 1 and the chain 7. The four wheels 10, 11, 12, 13 and therefore the chain 8 lie in a vertical plane substantially below the longitudinal edge 1a of the conveyor belt. The wheels 10, 11, 12, 13 are arranged so that the chain 8 surrounding them is parallel to a first upwardly inclined section 8 a, a second downwardly inclined section 8 b, and a longitudinal edge 1 a of the conveyor belt 1. However, it is divided into a third section 8c running opposite to it, and finally a fourth section 8d running parallel to this third section and adjacent to the conveyor belt 1. The chain 8 has three engaging members 9 that are equally spaced from each other.
[0025]
The operation of this apparatus will be described below.
[0026]
First, the conveyor belt 1 and the chains 7 and 8 are started. The bag body is fed onto the conveyor belt at predetermined intervals and these are synchronized with the slide 3 that moves horizontally around the rail 4. When the first slide reaches a position close to the wheel 13, the engaging member 9 of the chain 8 engages with the open end of the slide in front of the U-beam 38. This occurs because the absolute velocity of the chain 8 parallel to the chain 7 in the inclined track section 8a is less than the absolute velocity of the chain 7, although the absolute velocity of the chain 8 is greater than the absolute velocity of the chain 7. This slide 3 is meant to overtake and catch up with the engaging member 9 in section 8a, moving this engagement member is firstly enters the forward end of the U beam 38 of the slide, then backwards through the At the same time, this is the reason why the slide is raised by the direction inclined upward of the track section 8a. Thus, the slide fingers engage the open ends of the bag body facing them, and during this time the wall of the bag body (which can be shown on the front of the drawing), the conveyor The belt is folded upward along a fold line defined by a ruler 15 located on the bag body along the longitudinal edge 1a of the belt. The back wall of the bag body is completely or partially vacuum banded (this is seen behind the back wall of the bag body in the drawing, so that it does not fold with the bag body wall described above. May travel along the rear wall of the main body).
[0027]
Before the engagement member 9 leaves the rear end of the U-beam 38, the engagement member reaches the wheel 10 and changes to move along the section 8d. The slide fingers 36, 37 now reach their highest position and maintain that position as long as the engaging member 9 is in section 8d. The end of the bag body has a hexagonal folded shape as shown by the bag body 2a. In this state, the valve seat can be bonded or welded if necessary. In the section 8d parallel to the conveyor belt, the engagement member again has a speed that is faster than the speed of the orbital movement of the slide and therefore moves again in front of the U-beam 38.
[0028]
During the movement of the engaging member in section 8d, the next slide has already reached the position of the edge 13 and enters into engagement with another engaging member 9 of the chain 8. This second slide, and all further slide movements, is performed as described above and does not require further explanation.
[0029]
Again discussing the movement of the first slide, the engagement member 9 reaches the wheel 11 and tilts downward (ie, the bag body) before leaving the forward end of the slide's U-beam. Take away the movement provided by the section 8b of the chain 8) and pull the slide downwards, the slide fingers finally leaving the bag body. In the position where the chain 8 turns around the wheel 12, the engagement member 9 eventually leaves the rear open end of the U-beam 38 and moves along the section 8c back to the wheel 13. Now engage another slide 3. After leaving the engaging member 9, the first slide 3 goes straight a distance and turns around the rail section 4c.
[0030]
If it is considered sufficient to retract the slide finger immediately after reaching the maximum extended position without having to stay in that extended position, omit one of the two wheels 10 or 11. For this purpose, it is also possible to omit the track section 8d of the chain 8.
[Brief description of the drawings]
FIG. 1 is a schematic side view of one embodiment of an apparatus for opening a tubular bag body according to the present invention.
FIG. 2 is a schematic plan view of the same apparatus as FIG.

Claims (17)

An apparatus for opening a tubular bag body opened at at least one end,
Having at least one slide, the slide between the walls of the bag body into one open end of the bag body to at least partially fold at least one end region of the wall of the bag body. At least one slide is movable in and out of the bag body end to be opened by means for reciprocating the corresponding slide;
Means for reciprocating each of the slide (3) (8-13) has at least one engaging member (9), said engaging member is movable along a predetermined path (8) And an apparatus for opening the tubular bag body, characterized in that the slide (3) is engaged with the slide (3) to move back and forth. At least one engaging member (9) is mounted on a driven chain (8) or belt that runs around the wheel (10, 11, 12, 13) or pulley, which wheel or pulley is attached to the bag body. Defining an approaching first track path section (8a), a second track path section (8b) moving away from the bag body, and a third track path section (8c) forming an engagement member return section. A device for opening a tubular bag body according to claim 1.   A fourth track path section (8d) having a substantially constant distance with respect to the bag body end to be opened comprises a first track path section (8a) and a second track path section (8b). The device for opening a tubular bag body according to claim 2, characterized in that it is provided between the two. 4. The position of at least one wheel (10, 11, 12, 13) or pulley in the means (8-13) for reciprocating each slide is adjustable. An apparatus for opening the tubular bag body according to any one of the above. 5. Opening a tubular bag body according to claim 1 , characterized in that each slide has a guide path (38) for sliding engagement with an engagement member (9). apparatus. The guide path of each slide for sliding engagement with the engagement member (9) takes the form of a U beam (38) having an open end and attached to the slide, the longitudinal axis of the U beam. The device for opening a tubular bag body according to claim 5, characterized in that is arranged perpendicular to the reciprocating direction of the slide.   Furthermore, a conveyor device (1) for transferring the bag main body and a drive device (5, 6, 7) for moving the slide (3) along the track path are provided. The conveyor device (1) And the drive devices (5, 6, 7) for moving the slide along the trajectory path are synchronized with each other, so that the transfer speed of the bag body on the conveyor device during operation ( The tubular bag body according to any one of claims 2 to 6, characterized in that the arrow A) is substantially the same as the speed (arrow C) of the slide (3) along the trajectory path. Device to do. 8. The speed of the chain (8) or belt with the engaging member (9) is adjusted to be faster than the speed of the slide around the track path (4). A device for opening the tubular bag body.   A drive for moving the slide along the track path has a chain (7) traveling around the gear wheel (5, 6) or a belt traveling around the pulley, the chain or belt comprising: Device for opening a tubular bag body according to claim 7 or 8, characterized in that it is connected to at least one gear wheel or pulley connected to a slide and driven by a motor.   The drive device for the conveyor device (1) and the drive device (5, 6, 7) for moving the slide along the track path are drive devices that operate continuously. Item 10. A device for opening the tubular bag body according to any one of Items 7 to 9.   Opening a tubular bag body according to any one of claims 7 to 10, characterized in that a plurality of slides (3) are provided and arranged at equal distances along the track path (4). Equipment.   12. A tubular bag body according to any one of claims 7 to 11, characterized in that the track path is defined by a rail (4) on which each slide (3) is slidably mounted. Equipment for.   The means for slidably mounting the slide on the rail (4) comprises a bush (35) and a shaft (34) slidable therein, one of which is a roller (31 13. The device for opening a tubular bag body according to claim 12, characterized in that it engages the rail (4) by means of a sliding surface and the other is connected to the slide. Each slide (3) is a cross beam (39), characterized in that it have the at least two slide fingers (36, 37) attached thereto, according to any one of claims 1 to 13 A device for opening a tubular bag body. 15. The device for opening a tubular bag body according to claim 14, wherein the length and the distance between the two slide fingers are adjustable. The bag body is disposed in a laterally folded manner on a conveyor device for the back body, and a bag body portion extending in a direction from the lateral fold line toward the slide is substantially within the plane of reciprocation of the slide. There, while the bag body portion extending from the transverse fold line in a direction away slide, characterized in that located in a plane forming a plane angle of the reciprocating motion of the slide, according to claim 7 to 1 5 An apparatus for opening the tubular bag body according to any one of the above. The apparatus for opening a tubular bag body according to claim 16, wherein the angle is substantially a right angle.

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