BG63529B1 - Device of opening bag-like bodies of tubular form - Google Patents

Abstract

The invention relates to a device for opening of bag-like bodies of tubular form, opened at least from one of their ends, with at least one slide, inserted between the walls of the bag-like body for bending. The device improves the reliability, reduces the power consumption and the technical servicing time, thus increasing its productivity. The device includes at least one slide (3), moved inside-outside in the open end of the bag-like body (2, 2a) by at least one moving cam (9) running along a preset guiding line (38), meshed in slide (3). The latter is moved along the guiding line (4), parallel to the direction of the transportation of the bag-like bodies(2, 2a), travelling on the conveyor (1). The speed of transportation of the bag-like bodies (2, 2a) on the conveyor (1) and that of the slide (3) along the guiding line (4) are equal. 15 claims, 2 figures

Description

Technical field

The invention relates to a device for opening tubular tubular bodies open at least at one end with at least one slider. The device is useful in bending the wall of the bag bodies to shape the bottom of the bag.

BACKGROUND OF THE INVENTION

The production of bags consists in the preparation of the material in the form of sleeves (tubular form), which are obtained either by sleeve-shaped webs or by joining one another to the longitudinal edges of flat-webbed sleeves, cutting the material in the appearance of sleeves in baggy bodies of specified length and the formation of the bottom of the body of the bag by properly folding and joining the end of the body of the bag. A rectangular-bottomed bag is known as a pouch. In order to form the bottom of such a bag-case, in the case of the flat-lying bodies of the bags, the end of one of the two walls lying on top of one another rotates along a folding line, which is transverse to the longitudinal axis of the body of the bag, by which gives the end of the body of the bag a hexagonal configuration of folding, with two parallel, opposite-lying edges and two two-edged bending edges. By bending the two ends to each other and securing the retaining edges of the folding sides to each other or to the cover sheet, the bottom of the body of the bag is obtained, which, when folded separately from one another on the finished bag, receives a rectangular configuration. Before folding the edges, one more sheet can be inserted into each other, which, when fully folded at the end of the body of the bag, retains a tubular configuration.

Folding the open end of the bag bodies to shape the bottom of the bag is referred to as the “opening” of the bag bodies.

The device for folding the open end of the baggy bodies and shaping the bottom of the bag includes a movable belt conveyor with actuation in start-stop mode. The bag body, which lies with its longitudinal axis perpendicular to the direction of the belt conveyor, is transported to the opening station in which the belt conveyor stops. In the station for opening the edges of the edges of the sac body, a moving but usually fixedly mounted slider is used, which is moved at the end of the sac body to bend a portion of the upper wall of the body and to form a hexagonal configuration. The folding line along which the slider bends the wall of the bag body is defined by a beam located in the direction of transportation of the bag body over the bag body. The slider is moved back and forth via a pneumatic piston and cylinder system.

The disadvantage of this device is the necessary actuation in the start-stop mode, which leads to high wear and high energy consumption and, in addition, limits the performance, since the body of the bag must remain stationary throughout the movement of the slider.

DE A 1 511 021 discloses a method and apparatus for producing cross bottoms in sections of a sleeve for forming a cross bottom of bags. This continuous operating device includes a continuously moving conveyor belt for moving tubular shaped tubes through an opening station. The opening station houses sliders guided along a guide, partly parallel to the direction of transportation of the body of the bag, whereby the sliders and body of the bag are driven at the same speed. In order to allow the sliders to be inserted into the open end of the bag body, they are guided by a guide inclined towards the horizontal, arranged as a guide bar, in which the sliders are rolled through a control roller. A braking means is used in the device to position the tubular shaped portions in the forward position. The brake means is designed as a suction chamber with a conveyor belt in which there are perforated suction openings and the suction chamber is connected to a vacuum pump. The apparatus includes a welding means for welding the corner bends at the bottom of the package and a station for rearranging the shaped packages.

A disadvantage of the known device is the use of translational motions to move the sliders back and forth, resulting in greater wear and more energy consumption. This also affects the cost of maintenance, security and performance of the device.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a tubular-shaped opening device for tubular bodies that is robust, reliable, low energy consumption and requires little maintenance, and enables significantly increased productivity.

The problem is solved by a device for opening a tubular body of tubular shape, open at least at one end, by at least one slider inserted between the walls of the sac body, at its open end. The device includes means for moving back and forth of the respective slider at the end for opening the bag body. According to the invention, the forward / backward movement of the respective slider includes at least one driven by a predetermined guide movable hump trapped in the slider.

In a preferred embodiment, the cam is mounted on a drive chain, respectively, a transmission belt orbiting wheels or gear washers. The wheels define a first circulation section near the bag body, a second receding section and a third circulation section forming a reverse section for the humps.

It is appropriate to provide a fourth section of the circulation between the first and second sections of the circulation, which is at a constant distance from the end of the opening of the sac body.

It is preferable that the positions of at least one of the wheels, respectively of the transmission washers of the forward vehicle, be adjustable with respect to the respective slider.

In a preferred embodiment, each slider includes a guide for sliding engagement with the humps.

The guide of each slider for sliding engagement with the humps is designed as a U-shaped profile, fixed with the open end in the slider, whose longitudinal axis is at right angles to the direction of movement back and forth of the slider.

It is advantageous for the device to include a conveyor device for the transportation of the bag bodies and a drive device for moving the slider along the guide. In this case, it is appropriate that the drive of the conveyor and the drive of the slider movement on the guide are synchronized with each other, so that when the action of the conveyance of the baggy bodies on the conveyor is substantially equal to the speed of the slide on the guide.

It is advisable that the speed of the drive chain, respectively of the transmission belt with the cam is adjusted so that it is greater than that of the slide along the guide.

It is possible that the actuator for moving the slider along the guide includes a chain circulating around the gear wheels or a transmission belt circulating around the washers, whereby the chain, respectively the transmission belt, is connected to the slider and at least one of the gears, respectively. one of the transmission washers is driven by a motor.

It is expedient that the actuator of the conveyor and the actuator for the movement of the slider along the guide be continuous actuators.

In a preferred embodiment, a plurality of sliders are provided which are distributed along the guide at equal distances.

In another preferred embodiment, the guide is made of a rail to which the respective sliding slides are mounted.

In a preferred embodiment, there is provided a 3-way mounting device for sliding the slider along the rail, which includes a sleeve and an axle with a sliding feature. One of the bushing and axle members is engaged in the rail by rollers or sliding surfaces and the other is connected to the slider.

It is advantageous for each slider to include a crossbeam and at least two bolts attached to it, preferably spaced apart and lengthwise adjustable thumb slides.

Preferably, the bag bodies are arranged transversely folded on the bag carrier conveyor, wherein the portion of the bag body extending from the transverse line in the direction of the slider is disposed in the plane of movement of the slider back and forth. The portion of the sac body, which is distant from the line of folding, is arranged in a plane concluding an angle, preferably approximately a right angle, with the plane of motion of the slider back and forth.

It is desirable for the guide to be positioned at least two sliders at the same distance to take advantage of the system. Otherwise, long distances must be observed between the individual bags being transported so as to allow the slider to return to its initial position. The plurality of sliders provided reduces the time it takes for a single slider to open the body of a bag, which is of particular importance as it can be divided by the total number of sliders used and thus reduced arbitrarily.

The advantages of the device according to the invention are reliability, reduced energy consumption, light maintenance and significantly improved performance compared to known devices.

The minimum energy consumption and the minimum wear of the tubular bag opening device according to the invention is achieved when the conveyor drive and the slider drive actuator are continuously operating drives.

While for known devices, the slider generally consists of one plate, which should be completely replaced with each change of body size of the bag, in the refinement of the proposed bagging device, it is provided that each slider includes one cross beam and at least two sliding thumbs attached to it, preferably spaced apart and adjustable in length. Depending on the desired dimensions of the bottom of the bag, they are adjusted at a distance from each other (by which the longitudinal edge of the bottom is determined) and by their length (by which, along with the stroke length of the slider, the width of the edge of the bottom is determined). This saves the slider from changing when changing the size of the baggy body.

The device avoids the undesirable effect of having up to four layers of material on top of each other in the folded position of the bag bodies, while there is only one layer in the other sections. The device of the bag bodies is disposed transversely folded on the conveyor device for the bag bodies, whereby the portion of the bag body extending from the folding line in the direction to the slider is substantially in the plane of forward and backward movement of the slider. The portion of the sac body extending from the folding line away from the slider is disposed in a plane that forms an angle, preferably approximately a right angle, with the plane of motion of the slider back and forth. With this feature, after folding, a maximum of two layers of material of the sac body are laid on top of one another.

Description of the attached figures

The invention is now described, for example, by means of the drawings, where:

Figure 1 is an exemplary embodiment of a tubular-shaped tubular opening device according to the invention, schematically in side view;

Figure 2 is the same device in top view, in which the conveyor with the bagged bodies is not represented in the last figure.

Examples of carrying out the invention

In the following description, unless otherwise noted, FIG. 1 and FIG. 2 have the same designation. The disclosed device for opening tubular bodies of tubular form 2, 2a according to the invention includes a conveyor belt 1, on which the upper annular bodies 2, 2a are fixed by suitable means, for example vacuum. Conveyor belt 1 moves continuously and at a constant speed in the direction of arrow A. The sack bodies 2, 2a, except for one end portion which is to be formed at the bottom of the bag, are arranged horizontally on conveyor belt 1, whereby their longitudinal axes are transverse to the direction of transport. Said end portion of each bag body 2, 2a, folds perpendicularly down one longitudinal edge of conveyor belt 1 and hangs on one of the six sliders, generally indicated by 3. (only two sliders are shown in Fig. 1 for clarity). ).

The sliders 3 are slidably slidable to a bar 4 which includes two adjacent portions 4a, 4b that are connected to each other by two semicircular portions 4c, 4d. The fastening of each slider 3 to the rail 4 is secured by four rollers 31, two of which are respectively engaged in one of the two opposite edges of the rail 4. The rollers 31 are fastened to the front face of the head. the slider 33, from which the axis 34 is opposite the downward facing side. A sleeve 35 is mounted on this axis 34. This sleeve 35 is provided with a guide having a horizontal U-shaped profile 38 with open ends and a transverse beam 39, from which the perpendicular but up to have fingers 36, 37 of the slider in the form of elongated narrow plates arranged at a distance from one another. The slides 36, 37 of the slider 3 can be secured to the adjustable transverse beam 39. The guides with the U-profile 38 and the transverse beam 39 can form a single unit.

Below the semicircular sections 4c, 4d, concentric to them, are mounted two wheels 5,6 with perpendicular rotation axes 5a, 6a. At least one of the wheels 5, 6 is driven by a motor that is not represented. The two wheels 5, 6 are enclosed by a chain 7 which rotates in the direction of the arrow C. The speed of the chain 7 is the same as that of the conveyor belt 1. The chain is firmly gripped by one extension 32 of each slider and thus entrained by the respective sliders 3. The sliders 3 are distributed at equal distances around the chain 7 and therefore also around the bus 4, wherein the distance between two sliders 3 corresponds to the distance. which is between two bag bodies 2, 2a on conveyor belt 1. By appropriate control, it is further ensured that each slider 3, during its movement along the section 4a of the bus 4, is oriented towards one bag body 2, 2a on the conveyor belt. tape 1.

In order to ensure the movement of the sleeve 35 and thus of the thumbs 36, 37 of the slider 3 along the axis 34, one propulsion is provided. It consists of a chain 8 about four wheels 10, 11, 12, 13 with horizontal axes of rotation. At least one of the four wheels 10, 11, 12, 13 is driven so that the chain 8 moves in the direction of arrow B at a speed greater than that of conveyor belt 1 and chain 7. The four wheels 10, 11, 12, 13 and thus the chain 8 are arranged in a vertical plane which is approximately below the longitudinal edge 1a of the conveyor belt 1. The wheels 10, 11, 12, 13 divide the circumferential chain 8 into one first inclined obliquely section 8a, one second, obliquely downward section 8b, one passing parallel to the longitudinal edge 1a of conveyor belt 1, but turned to it, a third portion 8c and a fourth section 8d, which extends parallel to the third section and adjacent to the conveyor belt 1. Chain 8 has at equal intervals three cams 9.

The operation of the device is further explained.

Initially, conveyor belt 1 and circuits 7 and 8 are actuated, the bag bodies 2, 2a are brought to the conveyor belt 1 at predetermined distances and accordingly the sliders 3 are moved horizontally along the bar 4. Once a first slider 3 reaches a position, close to the wheel 13, the cam 9 of the chain 8 engages at the front open end of the guide with the U-profile 38 of the slider 3. This is obtained, although the absolute speed of the chain 8 is greater than that of the chain 7, while the parallel against the chain 7 k the speed component of chain 8, in the tapered portion 8a, is less than the absolute speed of chain 7. This means that in section 8a, the slider 3 catches up and outstrips the cam 9, so initially the cam 9 enters the leading edge of the guide with The U-profile 38 of the slider is then reversed therein, however, due to the slanting orientation of the guide section 8a, the slider 3 is raised. The thumb of the slider 3 thus engages the open-ended end of the bag body 2, thereby folding the front wall of the bag body 2, 2a along one fold line defined upwards by a linear 15 above the longitudinal edge 1a on conveyor belt 1 and thus also above the bag body 2, 2a. In this case, the back wall of the bag body 2, 2a can be completely or partially sucked in by a vacuum strip located in the plane of the drawing behind them and passing along with them, so that during the folding process it is not engaged with them.

Before the hump 9 at the rear end can be exited from the guide with the U-profile 38, it reaches the wheel 10 and moves along the section 8d. The thumbs 36, 37 of the slider 3 reach their highest position and retain it while the cam 9 is in the section 8d. The end of the torque body 2, 2a has obtained a hexagonal folding configuration as shown for the torque body 2a. In this position, a tape may be glued or welded if necessary. On the section 3d, which is parallel to the conveyor belt, the cam 9 is again faster than the speed of rotation of the slider 3 and therefore passes again the U-profile 38.

During movement of cam 9 in section 8d, one subsequent slider 3 reaches the position in the wheel 13 and engages another cam 9 on the chain 8. The movement of this second and all subsequent sliders 3 is carried out as described above and does not occur. needs further explanation.

The movement of the first slider, the back 9, before it can emerge at the front end of the guide with the U-profile of the slider 3, reaches the wheel 11, and passes into the line 8b inclined downward, more precisely at an angle 8b. distance from the bagging conveyor, directional movement, and in doing so it also draws the slider 3 down, the finger of which is finally separated from the bag body 2, 2a. When the chain 8 is turned into the wheel 12, the cam 9 finally leaves the guide U-profile 38 through its rear open end and moves along the section 8c back to the wheel 13 to engage there with the other slider 3. The first slider 3, after when released from the cam 9, it moves straight a certain distance to then turn in the section of the bar 4c.

It is also possible to omit one of the two wheels 10, 11 and thereby omit the portion of the trajectory 8d of the chain 8, if it is considered sufficient that the thumb of the slider 3, after reaching its maximum elapsed position, is immediately reversed. without staying in the trailing position.

Claims (15)

Claims 1. A device for opening tubular bodies of tubular form, open at least at one end, by at least one slider inserted between the walls of the bag body at its open end, and including means for forward movement of the respective slider at the end for opening the bag a body, characterized in that the forward-backward movement means (8-13) of the respective slider (3) comprise at least one movable cam (9) driven by a pre-set guide (38) trapped in the slider (3). A tubular-shaped body for opening tubular bodies according to claim 1, characterized in that the cam (9) is mounted on a drive chain (8) or. gear belt orbiting (10, 11, 12, 13) or respectively. transmission washers, whereby the wheels (10, 11, 12, 13) determine the first circulation section (8a), adjacent to the bag body, the second (8b, recirculating section, and third circulation section (8c), forming a backlash section (9). 3. A tubular body opening device according to claim 2, characterized in that a fourth circulation portion (8d) is provided between substantially constant distance (8d) between the first (8a) and the second (8b) portion of the circulation (8d). from the end for opening the bag body (2, 2a), A tubular body opening device according to claim 2 or 3, characterized in that the positions of at least one of the wheels (10, 11, 12, 13) or respectively. of the forward and reverse means of the transmission washers are adjustable with respect to the respective slider (3). An apparatus for opening tubular tubular bodies according to one of the preceding claims, characterized in that each slider (3) includes a guide (38) for sliding engagement with the cam (9). 6. A tubular body opening device according to claim 5, characterized in that the guide (38) of each slider (3) for sliding engagement with the cam (9) is provided as a U-shaped profile (38). fixed with the open end in the slider (3), the longitudinal axis of which is at right angles to the direction of movement back and forth of the slider (3). 7. A tubular-shaped body for opening tubular bodies according to claims 2 to 6, characterized in that a conveying device (1) for transporting the bag-like bodies (2a) and the actuating device (5, 6, 7) are also provided. ) for the movement of the slider (3) along the guide (4), wherein the actuation of the conveyor (1) and the actuator (5, 6, 7) for the movement of the slider (3) on the guide are synchronized with each other, thus that in action the transport speed (arrow A) of the baggy bodies on the conveyor (1) is substantially equal to the speed (arrow C) of the slide (3) on the guide. 8. A tubular body opening device according to claim 7, wherein the speed of the drive chain (8) or respectively. of the cam belt with the cam (9) is so adjusted that it is larger than that of the slide (3) on the guide (4). 9. A tubular body opening device according to claim 7 or 8, characterized in that the actuator (5.6, 7) for moving the slider (3) along the guide (4) includes circulating gears ( 5, 6) a chain (7) or a transmission belt circulating around the transmission washers, wherein the chain (7) or respectively. the transmission belt are connected to the slider (3) and at least one of the gears (5, 6) or respectively. one of the transmission washers is driven by a motor. 10. A tubular body opening device according to claim 7 or 8, characterized in that the actuation of the conveyor (1) and the actuator (5, 6, 7) for moving the slider (3) along the guide (4) are continuously operating drives. A tubular-shaped body for opening tubular bodies according to claims 7 to 10, characterized in that a plurality of sliders (3) are arranged, which are distributed along the guide (4) at equal distances. A tubular-shaped body for opening tubular bodies according to claims 7 to 11, characterized in that the guide is configured as a bar to which the respective slides (3) can be slidably mounted. 13. A tubular body opening device according to claim 12, characterized by a mounting device capable of sliding the slider (3) along the rail (4), comprising a sleeve (35) and an axis (34), with the possibility of sliding thereon, wherein one of the parts of the sleeve (35) and the axis (34) is engaged in the rail (4) by rollers (31) or sliding surfaces and the other is connected to the slider (3). An apparatus for opening tubular tubular bodies according to one of the preceding claims, characterized in that each slider (3) includes a transverse beam (39) and at least two fixed to it spaced apart and adjustable in length. thumbs (35, 37) of the slider (3). 15. A tubular-shaped body for opening tubular bodies according to one of claims 7 to 14, characterized in that the bag-like bodies (2a) are disposed transversely folded on the conveying device (1) for the bag-like bodies (2a), at which extends from the cross-fold line in the direction of the slider (3) a portion of the bag body (2a) substantially in the plane of movement of the back-and-forth of the slider (3) and the portion of the bag-body (2a) which is distant from the line of folding, is located in a plane, with a locking angle, preferably approximately a right angle, 5 with the plane of motion of the slider back and forth (3).