DE1938881A1 - Lining bags with plastics pockets - Google Patents

Abstract

Lining bags with plastics pockets Is effected by thermo-welding transversely a length of plastics lay-flat tube, holding the length of the lay-flat tube in a stretched condition, opening the bag for insertion of the length of the tube in the bag and severing the length of the lay-flat tube from the supply roll of the tube whereby a transverse thermo-weld is formed simultaneously for the following plastics pocket such that the process of lining can be repeated automatically.

Description

Method for lining sacks with a bag-shaped Insert made of plastic, and device for carrying out the method The invention relate to a method of lining sacks with a bag-like Insert made of plastic, and on a device for carrying out this process.

As is well known, there is often a requirement for an inner lining of sacks, e.g. paper sacks, with a pocket-like insert made of plastic, which is longer than the sack as such.

The object of the invention is to provide a method and a device to demonstrate the implementation of the same. This is made from a semi-finished product in the form assumed a flat hose made of plastic.

The process according to the invention is characterized by the following process steps: The outer end of a flat hose made of plastic is welded in the transverse direction; a part of this hose, the length of which is at least equal to the length of the bag-shaped one is used, is tensioned; the one to be lined with a pocket-shaped insert In the open position, the bag is pushed over this part of the hose; the area The hose is cut in the state of the% over-weld seam, with this distance is equal to the length of the pocket-shaped insert. At the same time being beyond this Interface carried out a transverse weld, through which the bottom of the subsequent pocket-shaped insert is formed. The one with the pocket-shaped inner liner provided sack is removed from the device, whereby the individual work processes repeat automatically.

The invention also relates to a device for implementation this procedure. In the device according to the invention, a coil is provided, on which the flat plastic tube is wound. Fleece coil lies with their peripheral surface on two rollers. This is a reciprocating Carriage moved in a direction which is perpendicular to the axis of the spool. The movement of this agent takes place by means of a double-acting, for example hydraulic actuator. This car stands on an endless chain in connection, which is guided by a gear that moves freely on a shaft is stored. In this way the movement of the car is then transferred to the shaft, when the carriage moves away from the spool. The movement of the shaft is by means of a suitable means, at least via a mechanical device one of the reels like this transferred that the peripheral speed of the Roller is equal to the translation speed of the carriage.

According to a further feature of the device according to the invention the outer ends of the flat plastic tube as well as the outer ends of the sack to be lined by static friction on pipes running in the transverse direction held, which are provided with holes and placed under negative pressure. At the end of the operating process, one of these pipes is connected to a source of compressed air associated with the purpose of removing the lined sack from the device to be carried out.

The sacks to be lined are from one on top of the other Side of the coil arranged Traflsportvorrichtung one after the other of the device This transport device moves the bags backwards for as long as until a limit switch indicates the arrival of a bag to be lined at the rear end of the Detects the transport device. This transport device is on sliding guides stored so that it can be moved relative to the device, such that Bags of different lengths are lined with a pocket-shaped insert can.

The advantages of the invention are as follows: Short work cycles of the manufacturing process and low labor input due to the extensive mechanization.

The pocket-shaped inserts are made from a flat tube Made of plastic, which is wound onto an open roll. At this level Hose is a semi-finished product that is created directly by the plastic film @ Wira delivered so that the costs can be reduced.

Because the speed of movement of the carriage and the flat hose made of plastic are very closely approximated, is the danger the tearing of the flat plastic hose is greatly reduced.

The support of the bags with the help of pressurized Pipes facilitates the mechanization of the device according to the invention.

The method according to the invention and the device for carrying it out the same are explained in more detail below with reference to the drawing. In this show in a purely schematic manner: FIG. 1 a view of the device according to the invention Big. FIG. 2 is a plan view of the assembly of FIG denotes a coil, which consists of a flat tube made of thermo-weldable Plastic, e.g. made of a polyethylene film. This coil 1 rests on her Circumferential surface on cylindrical rollers 2a, 2b.

The roller 2a is set in rotation via the gear 3, the in turn driven by a pinion gear.

The device has a longitudinally extending Cheeks 7 or flanges existing frame, which their cross struts 8 miteinender are connected.

With he inside of the cheeks 7 or flanges are with the help of carriers 10 two longitudinally extending sliding guides, e.g. cylindrical rods tied together.

Along these rods slides with the interposition of four rings 12 a movable carriage 11 or slide. This car 1-1 has a fixed Plate 1) showing the four blades @@ @@ l @@@ n @ nu @@. v @ l @@ l @ u @@. @ ll @ @ l @ sen @@ lligen 12 sl @@@ two vertical columns 14 connected.

The movable carriage 11 is with the arm 15 of a double-acting, hydraulic actuator 16 in connection.

An endless chain 21 is looped over the two chain wheels 19, 20. The inverted tooth chain 19 is loosely supported on the stub shaft 17.

The toothed chain wheel 20 is on the shaft 18 in the manner of a freewheel mounted, a second gear 22 being keyed onto this shaft 18. Above An endless chain 23 is looped around the two gears 5 and 22.

A cranked support 25, which through a horizontal recess in which one of the two cheeks 7 is passed, connects the carriage 11 with the upper Tr1m of the toothed chain 21 in such a way that the movement of the carriage 11 in the direction in which it moves away from the bobbin 1 via the gears 20 and 22 on the chain 29, the gearwheel 5 and via the gear 3 on the roller 2a is transmitted. The transmission ratio corresponds to this mechanical transmission the value 1 - so that the peripheral speeds of the roller 2a and the gear 20 are the same size.

In contrast, the displacement of the carriage 11 to the rear is insofar not transmitted, as the gear 20 on the shaft 18 in this iLichtung as a freewheel works.

The roller 24 is keyed onto the shaft 18. On every pillar 14, the upper arms 26 are mounted in front, -on which one in the transverse direction extending tube 28 is attached. On each column 14 are the lower ones Arms 27 are arranged, on which a tube 30 extending in the transverse direction is attached. The tube 28 has downwardly directed bores which are suction cups 29 are covered. Likewise, the tube 30 has bores directed upwards which the suction cups 31 are mounted.

The arms 26 and 28 slide along the pillars 14 by means of rings 32 out, which with the help of springs 34 resting against the stops 33 in the operating position are maintained. The stops 33 are sia upper and the lower outer end of the pillars 14 '.

On the pillars 14 two carriers 35 are mounted via sliding rings 36, between which a transversely extending tube 37 is arranged.

This tube 37 has a rectangular cross-section, with in the upward facing surface holes are incorporated. The slip rings 36 are from the springs 38 pushed up.

At the outer end of a longitudinally extending the tube 40 is arranged a pipe 39 pointing in the transverse direction, the width of which is equal to that Width of the existing plastic, provided with holes pointing downwards smooth pipe-is. The tube 40 is in Sester rotary connection with a rluerachse 41, the rotational movement of this axis 41 S is controlled by a lever 42 which is in communication with an auxiliary cylinder 43 actuated by pressure medium. -The pipes 28, 30, 37 and 40 can be flexible via not shown in the drawing Lines are brought into connection with a vacuum source.

The pipe 40 can alternately act on or under compressed air Are put under pressure.

At 44 is a welding device such as an electric welding machine denotes which is arranged transversely to the device according to the invention.

A cutting blade 45 is arranged a little in front of this welding device 44. This cutting blade 45 can be displaced in the transverse direction. She is - for example attached to an endless rope or cable not shown in the drawing, which is connected to an actuator.

Above the roller 24 is a roller freely rotatable on an axis 46 stored, wherein clamping devices 17 or tensioners are provided which a Contact between these two rollers 24, 46 is maintained. The flat hose 48 engages between these two rollers P6 24- a.

The right part of the two figures shown in the drawing shows those organs of the device that are used to provide and supply the to be lined Sacks are suitable and intended.

This part consists of a carriage or slide with two cheeks 49 or flanges which are connected to one another via cross struts 50. The distance between the two cheeks 49 or flanges is kept smaller than the distance between the inner walls of the cheeks 7. The cheeks 49 point on their outer surfaces Slide guides 51 with raised surfaces, these slide guides 51 Support on rails 52. These rails 52 are on the inner walls of the cheeks 7 arranged so that the carriage t9 or slide in its entirety in the direction the facility can be moved.

| / before- | It is also seen a transport device / which consists of flat belts 55, the upper run of which moves in one direction is, which proceeds from the rear outer end of the device and after Coil leads. This | flat belt 55 are in recesses 67 in a Working | table 66 are incorporated. About the work table 66 with a Feed or an insert to be lined sacks of the device fed one after the other.

Above the straps 55 is a second set of level | Belt 59 mounted, with the sacks sandwiched between the two sets of straps. The drive of the belt 59 takes place by the friction of the belt 55. The work table 66 is closed towards the rear extended by a fold-down part 68.

The axle 55 on which the rollers for driving the belt 54 are keyed can be rotated in any way. The two axes are stored in bearings that move down along inclined ramps or levels can. Two actuators or electromagnets 70, | which of a ' Limit switches are controlled, which s @ the arrival of a sack at the rear, outer Detects the end of the transport device, causing the bearings to move in Direction of the ramps or sloping planes downwards and the stripping of the belts 55 below the level of the work table 66. This is also the reason why the Bags lying on the work table 66 are not taken.

At the rear of the cheeks 59, specifically on their inner surface, are the inclined surfaces 73 arranged against which the tubes 28 rest when the movable carriage 11 reaches the end position as it moves forward Has.

The mode of operation of the device according to the invention | is the following: When starting, the movable carriage 11 is at the end of its movement in the direction the coil. In this position the tube 37 lies in the vertical plane of the welding device 44 and the cutting blade 45.

A transverse weld is now carried out, which forms the bottom of the first pocket, where possible the end of the flat hose that protrudes beyond the weld seam is cut off.

Then the sacks to be lined are placed one behind the other on the work table 66 fed, the opening of which is directed backwards, that is, in The direction of the coil.

The device is now ready for automatic operation. That Tube 7 is now placed under negative pressure, with the contact of the outer end of the flat hose with this pipe is maintained by negative pressure. the The double-acting hydraulic actuating device 16 now pushes the carriage 11 forward, taking the flat hose with it and starting to turn.

When the movable carriage 11 at the end of its movement forward against the stop runs up, it is automatically stopped by a limit switch. -In this position, the tube 37 is in the vertical plane of the tube 59, and the tubes 29 and 30, which have laid against the ramps 73, approach on both sides of the opening of the bag to be lined each other, which is at the rear outer end of the work table 66 is stopped.

The limit switch automatically suppresses the vacuum in the ear 57, puts the tubes 39, 29 and 30 under negative pressure and controls the reversal of the working direction the hydraulic actuator 16. The carriage 11 moves rearward The flat hose remains taut insofar as the outer, welded end under the effect of the vacuum on the tube 39 remains. The sack to be lined the two sides of which were captured by the suction cups 29 and 30, lies against the flat tube and opens under the action of the inclined ramps 73.

When the movable carriage ii the stop located on the spool has reached, a limit switch sets the carriage 11 in its movement automatically stops and simultaneously sets the welding device 44 and the actuating device the cutting blade 45 in operation.

In this way, the pocket-shaped insert of the first sack separated from the flat hose, the weld seam the bottom of the subsequent Bag forms.

The limit switch releases the vacuum in the upper tubes 29 and 31 and creates a vacuum in the tube 3 ?.

When the cutting blade 45 has made the cut, so controls a limit switch the actuating device 43, which the tube 40 around the axis 41 swivel 1st. At the end of the movement, a contact breaks the vacuum in the Tube 40 and generates a jet of air, which the now lined sack from the institution.

The pipe 40 again occupies its horizontal bearing | and the operations repeat themselves automatically.

The device according to the invention contains various control devices. The length of the pocket-shaped insert protruding from the sack to be lined is determined by the distance between the axis measured in the longitudinal direction of the tube 37 and the plane passing through the axes of the tubes 28 and, 0. The tube 37 is attached to the carrier 35 by means of elongated bores 75, which change this length- | design bar. The length of the bags to be lined can be changed The stroke of the respective carriage 11 is within certain limits, e.g. between 0.8 m and 1.4 m, adjustable by moving the end contacts. The rear stop remains fixed, while only the front stop is moved will.

As the device for feeding the sacks to be worn on sliding guides is advanced, it is easy to change the feeder in case of change to shift the sack length. The length of the pipe 1-0 changes with the transition from one to the other production line.

An obvious advantage of the invention is the possibility the manufacture of lined S @ ck @@, the pocket-shaped inserts in Their length is greater than the few in the sack. In both of these cases it is actually impossible, a pocket-shaped insert made of plastic thereby to get that extra canvas at the moment of making the sock is used; in general, the pocket-shaped inserts are manufactured separately and introduced into the sacks by hand, to which this high loss of time can be attributed are.

- patent claims -

Claims (14)

Claims 1. A method for lining bags with a pocket-like insert made of plastic, d u r c h e -k k e n n n z e i c h n e t that the outer end of a flat tube made of plastic in the transverse direction is welded, with a hose part, the length of which is at least equal to the length the pocket-shaped insert is kept under tension that the lining to be lined Open the sack and slide it over this part of the hose so that it is flat Schlauc simultaneously with the implementation of the bottom of the subsequent deposit forming transverse weld is cut in the transverse direction that the one with the insert inside lined sack is carried out of the facility, and that this Repeat the process automatically for the following bags. 2. Device for performing the method according to claim 1, d a d u r c h g e k e n n n z e i c h n e t that the device has two rollers (2a, 2b) has, on which a wound with a plastic hose Coil (1) t rests on its circumferential surface, with a perpendicular to the axis of the coil reciprocating carriage (1! 1), one of the movement of this carriage (11) on at least a roller transferring mechanism in a direction in which the carriage moves away from the spool in such a way that the peripheral speed of the roller is the same is the translational speed of the car, while the reverse motion of the car is not transferred, with a welding device working in the transverse direction (44), with a cutting blade (45) that can be parallel to the axis of the coil (1) beer:. with paralle | to the axis of the column lying pipes, the width of which is the same 3reite the flat tube (a8), with these tubes bores on one of their surfaces have which can be placed under negative pressure to hold the flat hose (48) are and with a feeding table accommodating a transport device (66) on which the sacks to be lined are arranged one after the other, which are pushed in the direction of the movable carriage, and with limit switches which control the sequence of operations. 3. Device according to claim 2, d a d u r c h g e k e n n -z z e i c h n e t that the carriage is operated by means of a double-acting pressure medium-controlled Actuating device (16) is movable. 4. Device according to claim 2, d a d u r -c h g e k e n n ~ z e i c h n e t that the mechanism for transmitting the movement of the carriage to the Rolling has an endless chain, one strand of which is connected to the carriage and which drives a first gear (20) which is in the manner of a freewheel on a Shaft (18) is mounted on which a second gear (22) is keyed, with this second gear (22) in turn via a chain drive and a gear at least e one of the rollers (2a) drives, and that the reduction ratio is selected is that the peripheral speed of the roller 1l (2a, 2b) is equal to the translation total speed of the car. 5. Device according to claim 4, d a d u r c h 3 e k e n n - | z z e i c h ne t that the shaft on which the first gear (20) is in the manner of a freewheel is wedged, with a roller (24) arranged parallel to the axis of the bobbin (1) ~ is connected that above this roller (24) a second roller (46) is arranged is which on its axis in the manner of a | Free-wheel bearing and tangential to the first roller (24) is arranged, and that the flat hose (48) between these two rollers (24, 46) lies. 6. Device according to claim 2, d a d u r c h g e k e = n n -z e i c It should be noted that the movable carriage carries a first tube (37) which, under negative pressure is settable and has holes on its upper surface, and that this tube (37) under the welding device (44) and the cutting blade (45) when the -The carriage hits the bobbin (i). 7. Device according to claim 2, d a d u r c h g e k e n n z e i c It should be noted that the movable carriage has two tubes (28, 30) which are under negative pressure can be set and are provided with bores which are covered with suction cups (29, 31) are, and that these, by two columns (14) held tubes (28, 30) of two springs (34, 38) arranged on these columns (14) are held apart from one another and be approached under the action of inclined ramps (73) when the carriage hits the opposite side of the spool (1) 8. Direction according to claim 2, that a pipe (39), which can be set alternately under negative pressure and under pressure and at its lower surface has bores connected to the outer end of a pivot arm (42) is, which under the action of an actuator (43) to a parallel to the axis of the coil lying axis is pivotable, and that this tube (39) in the is arranged transversely to the device plane in which the pipe (37) when the carriage reaches the furthest position from the spool Has. 9. Device according to claim 6 and 7, d a d u r c h g e -k e n n z e i c h n e t that the distance between the axis of the tube (37) and the vertical, the plane passing through the axis of the tube can be changed and the length corresponds to the pocket-shaped insert that protrudes from the sack to be lined on the inside. . 10. Device according to claim 2, d a d u r c h g e k e n n -z e i c h n e t that the cutting blade (45) on a moving in the transverse direction endless rope attached i-st, which with a double-acting actuating cylinder is in communication, and that the cutting blade (45) is a little ahead of the transverse direction working welding device (44) and on the opposite side of the coil lies. 11. Device according to claim 2, d a d u r c h g e k e n p z e i c Note that the feed table (66) is used to introduce the sacks to be lined on the inside next to the device and opposite the coil, u7ld that the level of the upper The surface coincides with the plane in which the plane hose is stretched remain. 12. Device according to claim 11, d a d u r c h g e k e n nz e i c n e t that in the upper .. surface of the feed table (66) for the introduction of the inside sacks to be lined in diC warehouse in longitudinally extending recesses (67) are incorporated, through which flat belts (55) are passed, which are driven by unterh @ lb des Ti @ ches liege @@@ n rollers, which on an in moveable bearings are mounted on the rotatable shaft, and this belt (55) is a stick out a little over the level of the table until a limit switch arrives of a sack at the outer end of the table and an Eletrome @@ ne- | th (70) or a pressure fluid-actuated cylinder controls the movement of the sliding Bearings below and a stripping of the belts below the upper level of the table evokes. 13-. Device according to Claim 2, d a d u r c-h g e k e n n -z e i c h n e t that the limit switches at the two stroke ends of the movable carriage and a stroke end of the cutting blade (45) are arranged, and that this limit switch the Control the sequence of operations. 14. Device according to claim 2, d a d u r c h g e k e n n z e i c Note that the feeding table (66) is used to introduce the sacks to be lined on the inside lies on sliding guides (51). and relative to the remainder of the facility is movable in the longitudinal direction, such that bags of different lengths with bag-like Inner inserts can be lined by, in addition, the length of the Tube (39) is changeable and by moving the limit switch of the movable carriage will.