DE4206968A1 - Automatic wrapping device for rectangular paper stacks - has welding and cutting device and heat sealable plastics foils - Google Patents

Abstract

The welding and cutting device (30) has a heating element (31) and contact pressure element (32) both movable up and down towards and away from each other. A row of spaced out delivery conveyors (10, 10a) press on the top and bottom faces of the stack (P) to move same along. The plastics foil is on the back of the wrapping paper supplied by top and bottom winding rollers (1). A row of spaced out sliding conveyors (11, 11a) press on the top and bottom faces of the wrapped stack to move same along and have on both sides edge folders (50, 60) folding the leading and trailing parts of the opposite side edges of the stack and then the remaining top and bottom parts. The welding and sealing devices (80) adjoin the folders (50, 60) on both sides of the sliding conveyors to seal the superposed parts of the side edges. ADVANTAGE - Improved efficiency even when wrapping concave stacks of papers, catalogues or other printed products.

Description

The invention relates to a method and a front direction for automatic driving in square or rectangular stack of paper products such as paperbacks, Magazines and other square or rectangular pa pier products.

As is known per se, stacks are made from paper products wrapped with wrapping paper, the back of which is from egg ner heat-sealable plastic film is formed, and the folded parts of the wrapped stacks are heated, to selectively shrink the heat sealable plastic to cause carrier film, causing the wrapping of such Stack is closed by tightly closing. At this "impact and shrink" process, however, can easily happen that the paper products to be wrapped be damaged and therefore this method was used in the  Practice hardly used. In contrast, a stack from paper products on a folded sheet of paper placed; the wrapping paper is folded around the object; and the superimposed parts of the wrapping paper are connected with paste. This "fold and connect" Process is widely used. In the japani The laid-open publication 1-2 26 512 (A) is one such "Fold and Join" method using force paper shown.

According to the "folding and joining" process which is incorporated into the Japanese Patent Application 1-2 26 512 (A) is given, an object is wrapped in a sheet of kraft paper, to get a "body-hammered" item, wel protruding edges on both sides; and this before bouncing edges will be folded later. The manner, with which the projecting edges are folded is at for example in Japanese Patent Application Laid-Open No. 55-12 013 (A) or in the published utility model application 3-32 004 (A) described. After knocking an object into one Sheet of paper has the "body-hammered" object ahead running and trailing edges made of wrapping paper, which be overlaid and then these will overlap The edges are connected with the help of paste.

According to Japanese Patent Laid-Open No. 53-46 886 (A), a Polyethylene film used as wrapping material, which is wrapped around an object; the foil edges, which will meet around the object after being hit welded warm and cut to a "body wrapped gene "object to obtain, which opposite rän which has from the wrapping material, which on both sides lead and be open; and the opposite edges when striking the "body" object  the folded and connected to a completely closed Get wrapping.

With these usual wrapping processes, elevators are used used to drive items into either the "Pounding in the body" or lifting the "edge fold" steps and lower, and the overlapping bottom or foil rims that of an envelope are glued together. Here han it is complicated work, and hitting cannot be achieved with an increased production output realize.

Magazines or catalogs are along a long edge (Binding side) thicker than on the other sides and therefore takes a stack of magazines or catalogs easily a con caves at the top. Usual wrapping device lines can not be used to make such concave To hit stack. In particular, there may be deformations come or the stack may collapse. Sometimes lift the opposite edges of the concave stack and are bent until some time overhead in the stack writing, be folded in half and then the so deformed stack hit. Hence, stacks from magazines or catalogs not with the help of übli Chen impactors are hit, and derar actual stacks were actually handwrapped.

If synthetic resin films are used as wrapping material, can be used when welding and closing the wrapping dimension terials in the final stage easily damage the one beaten objects occur by using the synthetic resin is welded to the objects and adheres to them.

Taking into account the above statements, the  Invention mainly aims to be an automatic one to provide impact methods in which no compli adorned works such as lifting and lowering objects, the application of paste, etc. are required to do this to increase the output performance when wrapping.

The invention also aims at a device for carrying it out of such an automatic wrapping method put.

The invention also aims at a device for driving in of concave stacks from magazines, catalogs or others, to provide book-like printed matter in which the concave stacks are held in a standing position.

Furthermore, according to the invention, a device for wrapping stacks of paper products are provided, in which these products are not damaged.

The invention further aims to provide a wrapping device device that has the ability to make impact trajectories evenly and precisely to handle and a hammered Ge to give an appealing appearance.

According to the invention, the design is such that a series of feed conveyors upstream to downstream, upper and lower take-up and waste rolls for the one impact paper, which is sealed on the back with a heat seal ren, semi-rigid plastic film or a heat-weldable Plastic coating is provided, a welding and cutting direction, which are arranged on the transport route on the the square or rectangular stacks of paper moving products, a series of push conveyors and one Edge folding device are provided. The welding and cutting  device has heat pressing devices and cutters directions, both of which have the ability to can rise and fall in order to move towards or from each other to move each other away. The feed and push conveyors are at predetermined intervals for intermittent support of square or rectangular stacks of paper products nits arranged.

The feed conveyors bring to the upper and lower surfaces the square or rectangular stack of paper products release a pressure and holding force and transport it Continue stacking intermittently and apply egg to them ner pressure when this through the wrapping paper go which wind up between the top and bottom and Drain rollers is tensioned. Then every stack of paper draws products run ahead of the wrapping paper web of the end that moves in the feed direction until the on farthest upstream sliding conveyor in the forward direction pulls the stack of paper products. The push conveyor brings on the top and bottom surfaces of the stack of Pa a pressing and holding force, and he intermittently transports the stacks. If the Sta pel from paper products immediately the welding and cutting has left the facility, he will use the wrapping paper res from the leading page to the trailing page smashed and surrounded. The welding and cutting device The lower part then begins to lift and the upper part lengthways the trailing end of the stack of paper products lower which directly the welding and cutting device has left. The impact path is thus along the rear surface of the stack up and down until the fall parts of the wrapping paper and the rising edge of the wrapping paper meet. Then welded the Welding and cutting device of this structure along the ge  the entire width of the wrapping paper on the trailing side of the stack so enclosed and enclosed, and then cuts the welding and cutting device along the Mit line of the welded width of the wrapping paper, which then causes the respective stack to be "hammered in" is finished with the edges on the opposite side and are open.

The push conveyors apply a pressing and holding force the upper and lower surfaces of the "body-hammered" Stack up and transports these "body-battered" Stack forward, allow the edge folder the leading and trailing parts of the opposite edges and then the remaining top and bottom Fold parts of the opposite edges. After all, who which the superimposed parts of the opposite Welded edges and tightly sealed. The stacks from Pa Paper products are not raised or lowered during their onward transport, and it is not a paste application required. Therefore, the wrapping process is less complicated adorns and it enables automatic wrapping with a increased output.

Each of the feed and push conveyors has an upper one Set of a middle drive roller and two side pushers parts, a lower set from a middle drive roller and two side press parts and a device for adjustment len the lowering movement of the middle drive roller and the Side pressure parts of the upper set to the desired height te. The middle drive of the lower set is on a Hö henwert set, which is slightly higher than the side print parts are. With this interpretation, the upright position can be maintain the concave stack during wrapping, and there is no risk of the stack being made from paper nissen coincides.  

The welding and cutting device has a heating part and a pressing part, both of which have the ability to Execute upward and downward movement, so that the Parts approach each other or be moved away from each other. The heating element has a middle cutting blade and spring loaded heating devices, which on the opposite opposite sides of the cutting blade are arranged. The pressure part has a cross slot to insert the cutting blade tes to make it possible if the spring-loaded heating device gen pressed under resilient system by the pressing part be, so that it is thus possible that the cutting blade up over the spring loaded heaters can move. Every time a stack of paper products has left the welding and cutting device is working the device such that the stack of paper products is completely enveloped in that the lower part is raised ben and the upper part along the trailing side of the sta pels from paper products is lowered. So moves the wrapping path along the rear surface of the stack and down until the descending valley of the wrapping paper and the the rising edge of the wrapping paper meet. Then the welding and cutting device takes a weld along the entire width of the wrapping paper on the after the current side of the struck object, and then the device cuts along the center line of the ver welded through the wrapping paper web to to end the "body wrapping" of the respective stack, where the edges run on opposite sides and are open.

Each edge folding device has an elongated plate for the fold ten of the leading part of one or the other Ran of the "body hit" stack. The elongated plate has a major length which is parallel to that  Path of movement runs on which the "body-wrapped genen "stack and it has an end longitudinal part, which diverges from this path of movement. The elongated plate extends far to the downstream welding and sealing device downwards. The Edge folding device also has a folding arm, which is arranged upstream of the elongated plate the trailing part of the page margin under the outward diverging end longitudinal piece of the elongated plat press and the trailing part of the page edge wrinkles. The edge folding device also has a set upper and lower rods, each with small rolls ha ben, which are arranged in parallel at the end, and an An drive device for lifting and lowering the respective Stan ge, so that successively the leading and the trailing parts of the page margin, as well as the remaining upper and lower parts of the page margin are folded. As a result, each stack receives one in the wrapped state attractive outer shape.

Each welding and sealing device has a heater device on which is fixed to an elongated support that is parallel to one side or the other of the path of movement on which the turned move the stack. This elongated beam has a support rod, which is integrally connected to this and which in an associated bearing is slidably mounted. These Design together with the edge folding arrangement ensures that the welding and sealing of the respective stack off be closed without damaging the paper objects or damage.

Further details, features and advantages of the invention emerge from the description below of before  preferred embodiments with reference to the beige added drawing. It shows:

Fig. 1 is a perspective view of an automatic wrapping apparatus according to a preferred embodiment of the invention;

Fig. 2 is a front view of a main part of a Aufga carrier, which in the automatic An impact device according to Fig. 1 can be used,

Fig. 3 means a side view of a welding and cutting, which percussion device in the automatic A of FIG. 1 can be used,

Fig. 4 is a side view of a further welding and cutting device,

Fig. 5 is a plan view of a "body-chosen" stack,

Fig. 6 is a view showing the manner in which the leading end portions of the Seitenrän be that of the "body-chosen" stack gefal tet,

Fig. 7 is a view showing the manner in which the trailing parts of the Seitenrän that of the "body-chosen" stack are folded,

Fig. 8 is a view showing the positionsmä lar assignment, according to which the folding arm bezüg Lich of the elongated plate of Randfaltein direction in which, in Fig. 6 verdeutlichten Po is arranged sition,

Fig. 9 is a front view of an edge-folding means to illustrate the manner by which the upper and lower portions of the side edges are folded,

Fig. 10 is a plan view of the edge-folding means to illustrate the manner by which the upper and lower parts of the side edges tet gefal,

Fig. 11 is a plan view of the welding and sealing device to illustrate the manner in which the overlapping parts of the side edge are heated and sealed in a final step, and

Fig. 12 is a perspective view of a wrapped stack of paper products.

The impact method according to the invention is described in more detail below with reference to FIG. 1. It involves the following steps: wrapping a stack of paper products with a wrapping paper web to form a cylindrical "body wrapped" stack, the edges of which protrude on opposite sides and are open (hereinafter referred to as "body wrapping" step A) ; Folding the side margins (hereinafter referred to as "margin fold" step B); and welding and sealing the overlapping portions of the folded side edges (hereinafter referred to as "welding and sealing" or "finishing" step C).

In the drawing, an automatic wrapping system upstream to downstream has a number of feed conveyors 10 , 10 a, upper and lower winding and unwinding rolls 1 for the wrapping paper, which is provided on the back with a heat-sealable, semi-rigid plastic film or a heat-sealable plastic coating , a welding and cutting device 30 , a series of sliding conveyors 11 , 11 a, edge folding devices 50 , 60 and welding and sealing devices 80 , both of which are arranged on opposite sides of the movement path, along which the stacks of paper products move.

"Body hitting" step A

As can be seen from Fig. 1, the group of feed and push conveyors 10 , 10 a and 11 , 11 a are arranged at intervals in one and the same plane and designed such that they are intermittently driven by means of a drive chain (not shown) can be. The feed conveyor 10 , 10 'whose width is smaller than the width of the stack of paper products P sen, bring a pressing and holding force on the upper and lower surfaces of the square or rectangular stack of paper products P (see Fig. 2), and the feed conveyors 10 , 10 a transport these objects in a terminating manner and push them further through the wrapping paper web 1 , which is stretched between the upper and lower winding and unwinding rolls 1 via transverse guides 2 , 2 a.

The welding and cutting device 30 is arranged between the feed test conveyor 10 , 10 a lying on the white side and the most upstream sliding conveyor 11 , 11 a. As can be seen from Fig. 3, this one has a Heizandruckteil 31 and a pressing and cutting part 32 , both of which have the ability that they are raised and lowered to approach each other or move away from each other. The heating pressure part 31 comprises a heating pipe 33 . The pressing and cutting part 32 has a central cutting blade 32 a and a spring-loaded sheath. The cutting blade 32 a has silicone rubber parts 32 b, 32 b, which che are attached to opposite sides of the base part of the cutting blade 32 a. The spring-loaded envelope has a slidable cap, two guide pins 32 d, each having a coil spring 32 c, which is wound around this, and a base. The slidable cap is designed in such a way that it can slide on the guide pin 32 d ver, which are on the base. The Heizan pressing part 31 has a transverse slot 31a, which allows the cutting blade 32 a can be inserted, when the fe crude weighed cap is resiliently on the guide pin 32 a abge subjected so that the cutter blade 32 a can lift over the cap.

The Heizandrückteil 31 is movably mounted to a support frame 34 via rollers 31 b fixed, while the pressing-and-cutter member 32 is movably attached to the support frame 34 via rollers 32 e. The base part or the root part of the hot pressing part 31 is movably connected to a turntable 37 via a crank arm 35 , while the base part of the pressing and cutting part 32 is movably connected to the turntable 37 via a crank arm 36 . The crank arm 36 has a clamping nut 38 for adjusting the height of the pressing and cutting part 32 . These crank arms 35 and 36 are on the turntable 37 at diametrically opposite points. With this design, the rotary movements of the turntable 37 cause the heating pressure part 31 and the pressure and cutting part 32 to be moved toward and away from one another at a predetermined time interval.

In particular, when the turntable 37 rotates, the heating pressing part 31 and the pressing and cutting part 32 are moved towards each other and in the end these parts come into contact with each other. The turntable 37 continues its rotary motion and the springs 32 c begin to compress, where it is made possible that the cutting blade 32 a is moved up and the wrapping paper web is severed, which part 31 is clamped between the silicone rubber parts 32 b and the heating pressure . Then, the cutting blade 32 a enters the transverse slot 31 a of the Heizandrückteils 31st

The "body wrapping" can be done in a simple way that the stack P individually from the most downstream feed conveyor 10 , 10 a to the most upstream push conveyor 11 , 11 a are transported with passage through the tensioned wrapping paper web. First, the heating pressing part 31 and the pressing and cutting part 32 are arranged in a position moved away from each other to enable a stack of paper products to pass between them. The most downstream feed conveyor 10 , 10 a pushes the leading stack of paper products P. Then the stack of paper products pulls the wrapping paper web over the leading end and it is transported further until the most upstream push conveyor 11 , 11 a moves the stack of paper products in the direction of advance. The sliding conveyor 11 , 11 a brings on the upper and lower surfaces of the stack of paper products P a pressing and holding force, and it moves this intermittently. If the stack of paper products P has left the welding and cutting device immediately, the one from the leading part to the trailing part is covered with wrapping paper and wrapped in it. The welding and cutting device 30 now begins to work, the lower part 32 being raised and the upper part 31 being lowered along the trailing end of the stack of paper products which has left the welding and cutting device 30 immediately. Thus, the wrapping web is moved up and down along the rear surface of the stack P until the falling valley fold of the wrapping paper and the increasing edge fold of the wrapping paper meet. Then the welding and cutting device 30 performs a welding over the entire width of the wrapping paper on the trailing side of the stack to be covered and wrapped, and then the welding and cutting device cuts along the center line of the welded width of the wrapping paper web, so that each stack is "body wrapped" with the edges on the opposite sides and open.

Fig. 2 shows an example of a feed conveyor 20 , 20 a, which has an upper set of middle drive rollers 21 and two side pressure rollers 22 , a lower set of a middle drive roller 21 a and two side pressure rollers 22 a. The middle drive roller 21 of the upper set can be adjusted with respect to the lowering movement. In particular, the drive roller 21 and the side pressure rollers 22 are fastened to a cross plate 23 , and the cross plate 23 is fixedly connected to the piston rod 25 a of a pneumatic cylinder 25 . When the pneumatic cylinder 25 is actuated, the entire upper set is raised and lowered in an adjustable manner. In a similar manner, the side pressure rollers 22 are attached to the piston rods 26 a of the pneumatic cylinder 26 . When the pneumatic cylinders 26 are actuated, the side pressure rollers 22 are raised and lowered in an adjustable manner independently of the central drive roller 21 . The middle drive roller 21 is slightly offset from the opposing pressure rollers 22 to the front.

The middle drive roller of the lower set is attached to a stationary frame 27 , and this is set to a height position, which is slightly higher than the side pressure rollers 22 a. The middle drive rollers 21 , 21 a of the upper and lower sets are connected to drive chains (not shown), so that they are driven intermittently, while the side pressure rollers 22 , 22 a are supported by a free rotary motion. This since Lichen pressure rollers can be replaced by plates with smooth upper surfaces or any other part that allows concave stacks can be transported in such a way that their opposite rising ends are never depressed.

The correspondingly provided sliding conveyor 11 , 11 a in the "body impact" part of the impact road can have a similar structure to the feed conveyor 10 , 10 a. Preferably, the push conveyor 11 , 11 a in the "body impact" part and the subsequent "edge fold" part of the impact road, in which the leading and the trailing parts of the side edge of each stack are folded who (upstream of the part, where the remaining upper and lower parts of the side edge of each stack are folded) can have the same structure as the feed conveyor 10 , 10 a. When working the device, a concave stack of paper products, such as magazines, is placed between the middle drive roller 21 of the upper set and the middle drive roller 21 a of the lower set, the pneumatic cylinder 25 being driven to move the upper set of rollers downward , and then the opposite rising ends of the concave stack between the side pressure rollers 22 of the upper set and the side pressure rollers 22 a of the lower set are arranged, to which end the pneumatic cylinders 26 are driven to move the upper set of pressure rollers 22 down as shown in FIG. 2.

Thus, concave stacks become square or right angular shape reshaped so that neither folding nor a collapse at the "body impact" step can kick, so that the "body-beaten" stack one appealing external shape is given.

Fig. 4 shows another example of a welding and cutting device 40 . It has a heating and cutting part 41 and a pressing part 42 , both of which can rise and fall in order to move towards and away from one another. The heating and cutting part 41 has a central cutting blade 46 and spring-loaded heating devices 44 on a neck piece 41 a. Each spring-loaded heating device has a heating element 44 , which has a pin 44 a, which is integrally connected to it, and has a coil spring 43 , which is wound around the pin 44 a. Each pin 44 a is slidably inserted into an associated longitudinal opening of the neck piece 41 a. A small guide roller 45 is rotatably mounted on the outer side of the respective element 44 Heizele. The pressing member 42 has a transverse slot 42 a to enable insertion of the cutting blade 46 when the spring-loaded heating devices and the springs are pulled off the plant, so as to enable that the cutting blade 32 can be a effective.

The heating and cutting part 41 is fixedly connected to a lower toothed rack drive 47 , 48 , while the pressing part 42 is fixedly attached to an upper toothed rack drive 47 a, 48 a. The pinion 49 , 49 a of the same are designed such that they are driven by means of assigned gear motors 48 , 48 a. Rotation of these geared motors clockwise or counterclockwise causes the heating and cutting member 41 and the pressing member 42 to move up or down so that they move toward or away from each other.

When working the device, stacks of paper products are individually transported from the most downstream feed conveyor 10 , 10 a to the most upstream push conveyor 11 , 11 a with passage through the space, which by the raised pressing part 42 and the lowered heating and cutting part 41 is defined. Every time a stack of paper products P has left the welding and cutting device 40 , the push conveyor 11 , 11 a stops transporting. Then the welding and cutting device 40 works to completely enclose the stack of paper products P by raising the lower part 41 and lowering the upper part 42 along the trailing side of the stack of paper products P from. Thus, the wrapping web is moved up and down along the rear surface of the stack P until the descending valley of the wrapping paper and the rising edge of the wrapping paper meet, as shown in Fig. 4. Then the welder and cutter welds the assembly along the full width of the wrapping paper on the trailing side of the wrapped stack and then the heating and cutting member 41 is moved up to compress the springs 43 , thereby allowing the cutting blade 46 is moved upwards in a corresponding manner.

When the cutting blade 46 has moved over the heating elements 44 , the cutting blade 46 cuts through the wrapping paper, while the wrapped stack is arranged and compressed between the upper and lower parts 41 and 42 , whereby the "body wrapping" of the stack is completed, and then the sealed width of the wrapping paper is cut off.

As can be seen from Fig. 5, the "body-hammered" stack P 1 has horizontal, central welding lines 1 a, 1 a on the front and rear sides and cylindrical edges 1 b, 1 b on the opposite sides. The "body-wrapped ne" stack P 1 is transported to the "edge fold" part of the "weft" road with the aid of the push conveyors 11 , 11 a, which apply pressure forces to the upper and lower surfaces of the "body-wrapped" stack P 1 .

"Edge Fold" Step B

In the "edge fold" part B of the folding road, the push conveyors 11 , 11 a, which are designed similarly to the feed conveyors 10 , 10 a, intermittently move the "body hammered" stack P, and at the same time there is a pressing force on the upper one and the lower side of the respective "body-hammered" stack P 1 is applied, and the opposite side edges 1 b, 1 b of the respective "body-hammered" stack P are successively folded by means of the edge folding devices 50 , 60 which are arranged on both sides of the respective push conveyor , as can be seen from FIGS. 6 to 10.

Folding the leading and trailing parts of the opposite side edges of the respective "body "stack"

An edge folding device has an elongated plate 50 and a folding arm 60 . The elongated plate 50 has a major length 52 which is parallel to the path of movement on which the "body-hammered" stacks move, such as an end longitudinal part 51 which diverges from the path of movement. The main longitudinal portion 52 of the elongate plate is abge by a plurality of support rods 53 supporting. The main longitudinal piece 52 of the elongated plate extends to the "finishing" or "welding and sealing" part of the impact road. The transverse distance between the opposed elongated plates 50 may be a set characterized in that the support rods 53 on the two sides in accordance with the transverse dimensions extended nits from Papiererzeug of the stack or be retracted.

The folding arm 60 has a folding plate 61 , which is arranged upstream of the respective elongated plate 50 and extends inclined, and a rack and pinion drive 62 and 64 , which is connected to the folding plate 61 and is slidably mounted in an associated bearing 63 , and a reversible ren motor (not shown), which is connected to the pinion 64 of the rack and pinion drive. The reciprocating movement of the rack 62 causes the inclined folding plate 61 to move toward or away from the side of the "body" stack P 1 . As shown in Fig. 8, the folding plate 61 has a recess 61 a, which are provided on the right edge in order to enable that the diverging end 51 of the elongated plate 50 can go through the moving folding plate 61 .

The manner in which the edge folding device folds the leading and trailing parts 1 c and 1 d of the opposite side edges 1 b of the "body-wrapped" stack P 1 is described below. As shown in Fig. 6, the "body" stack P 1 is moved with the aid of assigned push conveyors 11 , 11 a, and the leading parts 1 c, 1 c on the opposite side edges of each "body" stack are depressed and by means of the elongated Me tallplatten 50 folded, which are arranged on both sides of the rail conveyor 11 , 11 a. When the trailing parts 1 d, 1 d of the opposite side edges 1 b, 1 b have passed the folding plates 61 of the folding arms 60 , who stopped the sliding conveyor 11 , 11 a. Then, the folding plates are accordingly Fig. 7 61 moves forward, i.e., the trailing parts 1, 1 of opposite sides of d edges 1 b, 1 b under the gen outwardly diverging ends 51 of the elongate plate 50 with a compressive force to beaufschla, so that the trailing parts 1 d, 1 d of the opposite side edges of the "body-beaten" stack P are folded. Then the sliding conveyors 11 , 11 a begin to transport the "body-hammered" stack P 1 further, the folded, trailing parts 1 d, 1 d being pressed under the extended plates 52 .

(Fold the remaining upper and lower parts of the ge opposite side edge of the respective "body hit "stack).

As shown in Fig. 9, the edge folding device further comprises means 70 , 70 a for folding the upper and lower longitudinal parts 1 e and 1 f of the opposite side edges 1 b, 1 b of the "body-hammered" stack P 1 . Each folding device has a set of upper and lower rack and pinion drives 72 , each having an associated drive 71 and an end plate 73 , which has five pressure rollers 74 with a small diameter, which are arranged in parallel and are stored in associated bearings 75 . Each end plate 73 has a diverging end 73 a.

As can be seen from Fig. 9, the "body-wrapped ne" stack P 1 , in which the leading and trailing parts of the opposite edges 1 b, 1 b are folded and pressed by the opposing elongated plates 52 , into one place transported, on which the longitudinal edge part folding device 70 , 70 a is arranged on the opposite sides of the respective sliding conveyor 11 , 11 a.

The upper assembly 70 is set a little later than the lower order to a 70 in operation. Thus, the lower end plate 73 folds the longitudinally extending, lower edge part 1 f and then the upper end plate 73 a folds the longitudinally extending, upper edge part 1 e over the folded, longitudinally extending, lower edge part 1 f. The main length 52 of the elongated plate 50 remains under the overlapping longitudinally extending upper and un lower edge parts, which are folded in this way. Thanks to the use of the longitudinal rollers 74 , the folding path can be stretched well without wrinkles forming, so that folds can be created in a certain way and these foldings have an appealing appearance.

The stack of paper products made this way are turned into the finishing part of the A Schlagstraße promoted.  

"Finishing" step C: welding and sealing the folded edges of the wrapped stack

This "finishing" portion C of the wrapping road has welding and sealing means 80, which, to be welded on at the sides of the furthest downstream disposed slide conveyors 11, 11 are located a the top and bottom edges and seal, which in the " Edge fold "step B are folded and placed on top of each other. Each welding and sealing device 80 has a horizontal heating device 81 which is fixedly attached to an elongated support 82 which extends parallel to one or the other side of the movement path on which the struck objects move. The elongated carrier 82 has a toothed rack 84 which is integrally connected to it and which is slidably mounted in an associated bearing 83 . The rack 84 is engaged with an associated pinion 85 , which is designed such that it can rotate clockwise or counterclockwise by means of an associated reversible motor (not shown). This makes it possible that the horizontal heating device 81, the superimposed upper and lower edges presses against the underlying main length 82 of the längli chen plate 50 for heating. There is therefore no danger of the paper products coming into contact with the melted plastic, which ensures that the sealed and tightly sealed stack has an attractive appearance.

As previously described, the main longitudinal portion 52 of the elongate plate 50 extends to the "finishing" portion of the impact line. In particular, the end 52 a of the elongated plate 50 is located downstream from the leading end of the sealed, wrapped stack P 2 in the "finishing" part of the impact road. The finished pile P 3 ( FIG. 12) thus completed is transported further with the aid of the sliding conveyor 11 , 11 a, and the main longitudinal part 52 of the elongated plate 50 is left.

The horizontal heating device 81 is in the described embodiment firmly connected to the end of the rack and pinion drive. However, it can also be attached to the end of the piston of a pneumatic cylinder if this is used instead of the rack and pinion drive.

The automatic wrapping device specified above provides wrapped stacks of paper products, whose transverse dimension is greater than the height. It can too for wrapping stacks of paper products whose height is greater than the transverse dimension, without fear that such a large one Stack collapses as the top and bottom the same during wrapping and tight sealing are held under a pressing force.

When wrapping elongated paper products, such as Newspapers, just a "body punch" is required, so that you don't have to do the edge folding of the stack.

Claims (8)

1. A method for the automatic wrapping of square or rectangular stacks of paper products, characterized by :
Inserting an automatic wrapping system which, from upstream to downstream, via a series of feed conveyors, upper and lower winding and unwinding rolls for wrapping paper, which is provided on the back with a heat-sealable, semi-rigid plastic film or a heat-sealable plastic coating, a welding and cutting device which is transverse to the path on which the square or rectangular stacks of paper products move, the welding and cutting means having heat pressing means and cutting means, both of which have the ability to be moved up and down to move towards or away from each other, have a series of push conveyors and have an edge folding device, the feed and push conveyors at predetermined intervals for intermittently transporting the square or rectangular stacks of paper products are arranged;
the feed conveyors apply a pressing and holding force to the upper and lower surfaces of the square or rectangular stack of paper products and intermittently transport and press these objects through the wrapping paper, which is stretched between the upper and lower winding and unwinding rolls, so that the stacks are covered by and wrapped by the wrapping paper web;
the welding and cutting device welds and cuts through the wrapping paper on the trailing side of each article covered and enclosed in this manner, where the "body wrapping" of each stack ends, and edges on the opposite sides of the "body wrapped" stack are open and open ;
the push conveyor applies a pressing and holding force to the upper and lower surfaces of the "body-hammered" stack and this "body-hammered" stack is transported in a timely manner, with an edge folding device folding the leading and trailing parts of the opposite edges and then the remaining top and ren folds lower parts of the opposite edges, and
Welding the superimposed parts of the folded opposite edges. 2. Device for the automatic wrapping of square or rectangular stacks of paper products, characterized in that it has the following from upstream to downstream:
a series of feed conveyors ( 10 , 10 a), which are arranged at predetermined intervals in order to apply a pressing and holding force to the upper and lower surfaces of the square or rectangular stack of paper products and to transport these objects intermittently,
upper and lower winding and unwinding rolls ( 1 ) for the stop paper, which is provided on the back with a heat-sealable, semi-rigid plastic film or a heat-sealable plastic coating,
a welding and cutting device ( 30 ) which is arranged transversely above the web on which the stacks of paper products move so that each stack of paper products to be processed is struck with the wrapping paper and the wrapping paper web on the downstream side of each stack is welded and severed from paper products to obtain "body-wrapped" stacks, the welding and cutting device ( 30 ) having a heat pressing device ( 31 ) and a cutting device ( 32 ), both of which have the ability to move up and down to move towards or away from each other
a series of sliding conveyors ( 11 , 11 a), which are arranged at predetermined intervals in order to apply a pressing and holding force to the upper and lower surfaces of the "body-beaten" stacks and to transport these "body-beaten" stacks further,
Edge folding devices ( 50 , 60 ), which are arranged on both sides of the corresponding sliding conveyor ( 11 , 11 a) in order to fold the leading and trailing parts of the opposite side edges of the "body-wrapped" stack and then the remaining upper and lower parts fold the opposite side edges, and
Welding and sealing devices ( 80 ), which are arranged after the folding devices ( 50 , 60 ) and are provided on both sides of the associated sliding conveyors ( 11 , 11 a) in order to weld the superimposed parts of the opposite side edges and previously folded side edges and seal. 3. Device for the automatic wrapping of square or rectangular stacks of paper products according to claim 2, characterized in that each task conveyor ( 10 , 10 a) has the following:
an upper set of a central drive roller ( 21 ) and two lateral pressure devices ( 22 ),
a lower set of a middle drive roller ( 21 a) and
two lateral pressing devices ( 22 a), the middle drive roller ( 21 a) of the lower set being adjustable to a height which is slightly higher than the lateral pressing devices ( 22 a), and a device for adjustable lowering of the middle Drive roller ( 21 ) and the side pressure devices ( 22 ) of the upper set to the desired height. 4. A device for automatic wrapping of square or rectangular stacks of paper products according to claim 3, characterized in that each of the sliding conveyors ( 11 , 11 a), which are assigned each time, further transport the "body-beaten" stacks, essentially the same structure as the feed conveyors ( 10 , 10 a). 5. The device for automatic wrapping of square or rectangular stacks of paper products according to claim 2, characterized in that the welding and cutting device ( 30 ) has a heating element ( 31 ) and a pressing element ( 32 ), both of which can be moved up and down are to (32 a) having towards or to be moved away from each other, said heating element (31) sheet has an average cutting and spring-loaded heating means (a 32) are arranged on opposite sides of the cutting blade, and that the pressing element (32 ) has a transverse slot ( 31 a), by means of which it is permitted that the cutting blade ( 32 ) can be inserted when the spring-loaded heating devices are pressed together under resilient contact by the pressing part ( 32 ) and thereby the cutting blade ( 32 a) the spring-loaded heating devices can be moved upwards. 6. The device for automatically wrapping square or rectangular stacks of paper products according to claim 2, characterized in that each edge folding device ( 50 , 60 ) has an elongated plate ( 50 ) for folding the outgoing part of one or the other side edge of the respective "body-wrapped" stack, the elongate plate ( 50 ) having a main longitudinal piece ( 52 ) which extends parallel to the path on which the "body-wrapped" stacks move, and an end longitudinal piece ( 51 ) which of the web diverges away, with the elongated plate ( 50 ) extending to the welding and sealing device ( 80 ), and further comprising a folding arm ( 60 ) which is arranged upstream of the elongated plate ( 50 ), around the trailing part of the side edge under the outwardly diverging, longitudinal end piece ( 51 ) of the elongated plate ( 50 ) to push down and fold the trailing part of the side margin. 7. The device for automatic wrapping of square or rectangular stacks of paper products according to claim 2, characterized in that each edge folding device ( 50 , 60 ) further comprises a set of upper and lower Ren rack and pinion drives ( 62 , 64 ), each with small roles have, which are arranged in parallel at the ends, and have a drive device to raise and lower the respective rack and pinion drives ( 62 , 64 ) and thereby successively the leading and trailing parts of the side edge, as well as the remaining upper and lower parts of the side edge wrinkles. 8. The device for automatically wrapping square or rectangular stacks of paper products according to claim 2, characterized in that each welding and sealing device ( 80 ) has a heating device ( 81 ) which is fixed to an elongated support ( 82 ), which runs parallel to one or the other side of the path on which the stacks driven in move, the elongate carrier ( 82 ) having a support rod ( 84 ) which is connected in one piece to it and in an associated bearing ( 83 ) is slidably supported.