DE1966161A1 - Feed rollers, especially for a machine for making bags - Google Patents

Description

Patent attorneys Dipl.- Ing.F.

Dipl.-Ing. H. Weigkmann, D1PL.-PHYS. Dr. K. Fincke Dipl.-Ing. R A / Weickmann, Dipl.-Chem. B. Huber

P 10 42 410.3-15 Tr. A. 1 g MÜNCHEN 86, DEN 1966161

PO Box 860 820

- ': ■ - · 'MÖHLSTRASSE 22, CALL NUMBER 483921/22

<983921/22>

FMC CORPORATION, 1-1-05 'Coieman Avenue,' San 3osg, California

U. St. A.

Einzugualzen, especially for a sewing machine for Manufacture of bags.

The invention relates to Einzugualzen, which are inabes special to Suitable for use in a machine for making bags.

To achieve a production output of 200 or more thermoplastic. To achieve bags per minute, the bag making machine must be equipped with the following properties: a). an inevitable control of the film during the down- spulans from the supply roll; b) maintaining a fixed spatial relationship to the Abuickel stand for the The supply roll and the delivery frame of the bag machine; c) if desired, a Zuickai mechanism that has a minimal Exerting strain on the film while applying a gusset of constant depth; d) Einzugualzen, their contact pressure evenly is distributed and who have the ability to yora one at the other end of the Ualzen a different contact pressure exercise; e) built-in mechanisms that remove the contact pressure, .when the foil feed is stopped to prevent the occurrence of to prevent flat spots on the slide; f) a safety strip, which have a uniform temperature distribution over its length and which is shielded against the release of heat to the film; ig) a locking bar drive that controls the locking bar manually or automatically raises if you want or if the foil feed

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is interrupted for any reason; h) Mechanisms for Vary the length of the boutela produced while running Machine so that you can adjust the bag size under aetriübübedinguriyön can correct or change precisely without a switch-off pause; i) sin 3-bag conveyor, which usually runs at greater speed than the slide and the one easily adjustable zuantj ili'ufiga Has control with which the speed under 2etri:; bjuedbedingungen can be adjusted in such a way that, among other things, trailing endb of the bag is sure to be gripped by a conventional braking mechanism, the bags can be found Edges can be stacked on top of each other in a neat stack.

The present invention is based on the object, varbtj ', ertb Indicate Einzugualzen, in particular to Werwendünj Lui Masr 'inen are suitable for making bags.

This is made possible by Einzugsaltzen, which the film web between aich take up and unwind from a supply roll according to the invention achieved in that the feed rollers with a device for controlling the contact pressure exerted on the film web and are equipped to release this pressure when the machine is stopped.

Such Einzugualzen have the advantage that the The pressure applied to the foil can be conveniently changed and a differentiated pressure can be generated as required » Preferably this is achieved by providing pneumatic or hydraulic working cylinders attached to each end the upper feed roller can apply a force, whereby the pressure can be the same, unequal or switched off for each cylinder in order to completely eliminate the contact pressure. A jewel of the AnpreS pressure is usually desired when the bag machine is stopped; this can be done manually or automatically, so as to prevent flat spots from forming on the film.

In the following, the invention will be described in greater detail on the basis of one of the drawings illustrated preferred embodiment explained in more detail will.

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ORIGINAL

In the drawing show:

Fiy. 1 A and Fiy. 1 ΰ, strung together at the break line Π, a device for the production of bags in a longitudinal section, in ciüüi the uai.n the FoIi? by a broken line and the iÜJiiLunu over ;. FülitinvorschuuG is indicated by arrows on this line-JuuLet;

Fi.j. 2 A and Fiy. 2 B, joined at the break line 5, the Jcutulriiasci.inc in plan view;

Fiyc 3 a Uörc, r ^ 3Gi te Dctailansicht, partly in section, _.ie the construction of the FiGchanismusas to change the contact pressure of the g

shows;

Fi-j. <* Ssine partial view in an enlarged scale along the line · ': - · ■' ♦ Figure 2 B, in which the relationship shown ISTJ between the closure bar, the 5chlie2rollG and Einzugsualzen

5 shows a section through FIG. 4 on a reduced scale along the line 3-5.

1A, 13, 2A and 2B show that the bag machine according to the invention, which is designated as a whole by 20, has a packaging stand 22 (FIG The film web, which is designated with U, is unwound from the supply roll 26 and folded from a folding board or V-board 28 along a line parallel to its ends. on the other hand, the snouted bag fold line is a distance from the center line to which it is parallel. 2A shows the U-board device for the production of bags with snouts, since the left edge of the film web, which is labeled L, H

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lichen distance from the right edge R.H. Has. The film web then comes under the influence of a closing mechanism 30 which creates an inwardly directed fold on that part of the film web attaches, which forms the bottom of the finished bag. These Fold is indicated by dashed lines in Fig. 2A and marked 32,

Uie can be seen from Fig. 1A, the winding mechanism 30 is on Support arms 34 mounted, which are connected to a cross bar 36 in a pivotable manner. The crossbar is on laterally spaced Frame parts 38 of the delivery frame attached to mix which it extends. On the crossbar 36 sits a rotatable roller 40 which mixes a first set of the film web Feed rollers 42 which are connected to a conventional regulating device 43 for the contact pressure. From here and there the film web is guided around a plurality of tensioning rollers 44, which are attached to uippenden Arms 46 sit, so.uie about rollers 4B, which are rotatably mounted with respect to the frame parts 38. The length of the slide that is on the Web to mix the rollers 44 and 48 is stored, serves as a temporary supply, which is automatically depending on the changing The values of the film tension become larger or smaller. This arrangement strives to produce a constant tension on the film web.

The frame of the bag machine ueist a foundation 50, from which in the transverse direction spaced side plates 52 etua in the Stick up in the middle of the machine. At the outlet end of the machine, further frame parts 54 are attached to the foundation 50, which serve to support the outlet controls described in detail later.

Between the frame parts 38 at the inlet of the machine and the side plates 52 arranged in the machine frame, a horizontal auxiliary platform 56 is attached which carries punch holes 58 which are mounted on a base plate 60, see FIG. 1A. Uie Fig. 2B can be seen, the base plate 60 is attached to a rectangular frame 62 such that it is adjustable in the transverse direction to this frame. An adjusting screw 64 holds the base plate in the set transverse position. The right ^! 109839/0089 _BAD

angular Rahman 62, who carries the punch 58, is also with With the help of a rack and pinion drive 66, 68 adjustable in the longitudinal direction. As shown schematically in FIG. 2B, the racks 66 are on the Inside of side rails 56 fixed, while the pinions 68 are wedged on a transverse axis 70, which in the rectangular Frame 62 is rotatably mounted. On one end of the transverse axis 70, a button 72 is attached to which the transverse axis is located rotate and thus can change the position of the punch 58 in the longitudinal direction.

In the transport direction in front of the punching 58 is an electronic device 72 for adjustment longitudinally of the film web and arranged transversely, commonly sawn as a scanner · g is characterized Uird. The longitudinal adjustment is carried out by pinions 74 (FIG. 1A) which mesh with the racks 66. The pinions 74 sit on a transverse rod 76 which is rotatably mounted in etua L-shaped frame parts 78. A cross bar 79 is attached to the vertical bars of the L-shaped frame parts 78. On the cross bar 79 of the scanner 72 is slidably supported ₀ It can in any position by means of a screw to be locked 80 "to the horizontal bar of L-shaped frame members 78 is fixed to a transverse bar 82 which, uie of Fig. 1A can be seen with its top is practically in the plane of the film web. So that the scanner responds repeatedly with certainty, the upper side of the crossbar 82 is colored outside so that it offers a good contrast for the perception of the printed setting mark. t The scanner is connected in the usual Ueise to the electrical control circuit of the bag machine to the clutch express and at the same time to actuate the brake, so that the advance of the film Uird stopped for a sufficient period of time to let act about the transverse stationary closing rail and the lateral Produce a weld seam for two longitudinally adjoining bags. When the locking bar has finished its function, the control circuit is caused to release the brake and press in the clutch, whereupon the film moves on again. ·

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Uie Fig. 1B shows, the film web passes intermittently in front of the scanner rotating infeed rollers 84, which are assigned to an upper and a lower set of Abatreiffingern BG bzu _a 88, which are detachably attached to crossbars 90 and D] . The draw-in clamps, which will be explained in more detail later, are provided with a device, generally designated 92, which regulates the contact pressure exerted by the draw-in clamps on the trap and, if necessary, removes it completely, and does this either optionally or automatically.

As protection against bending of the feed rollers, especially in the middle part, and to ensure a ylL-ichmüGigeri The contact pressure over the length of the feed rollers is bina 5t "Jtz- ™ roller 94 is provided behind the lower feed roller, which is in rolling contact with this. The backup roller 94 is in one ÜJor 96 rotatably mounted, which has an extension 98 which forms a link of a parallelogram 100. The vertical position of the support roller 94 and thus the force it exerts on the Exercises feed rollers, you can with the help of a Hebaschraubu 102 to adjust.

In the direction of transport, it is directly behind the intake pins a vertically reciprocating locking mechanism 104 is arranged, which, in cooperation with an intermittently rotating closing roller 106, attaches the transverse weld seams Fe attaches the folded film web. These welds form the side edges of the bags. The locking mechanism is moved back and forth by two cam disks 108, which are on a Uelle 110 seats. One of the neck disks is shown in Fig. 1B ga. the specific construction of this arrangement will be related later with the device shown in Fig. 13 described in more detail.

While the film web is passing the closing mechanism individual pouches then produced by a continuous running belt conveyor 112 are received. The belt conveyor has a number of transversely spaced apart and aligned upper and lower band groups 114

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and 116 which bend in the direction indicated by the arrows in Figure 1B. Those portions of the belts which _c in FIG 10 running from left to right, are in contact and capture the released from the locking mechanism pouch and transport them to a stacking table 118, the pile table is provided with adjustable stop plates 120 to the Beutul to a Pile to collect.

The upper belts 114 of the belt conveyor 112 revolve around its tensioning axis 122, which is rotatably supported in levers 124, which also still carry an eccentric roller 126, which is pressed by a spring 130 against an eccentric 128. As shown in FIG. 1, he is seated Eccentric 128 on a Uelle 132; in the course of the rotation of this The levers 124 pivot and raise and lower the levers Tension axis 122. The latter has the task of preventing any override balance the bag as it exits the closure mechanism 104 so that the bag does not wrinkle or wrinkle.

Before the bags are released and grounded onto the stacking table 118, come they under the action of common Uellualzen 134, which serve to stiffen the bag in the direction of propulsion, with it it does not warp when ejected onto the stacking table 118, before the exit to the stacking table the trailing end of the Bag momentarily detected by a braking mechanism 136 of known construction. '.

An electrically controllable direct current drive 138 is provided in order to coordinate the speed of the conveyor belt in such a way that the bags released by it are briefly grasped at or near their rear edge. The details of this DC drive will be explained in more detail in connection with FIGS. 16 and 18. It should only be anticipated here that FIG is. At its other end, the Uelle 143 also carries a belt pulley 144 _f which drives a belt 145, which also rotates a belt pulley 146 on a Uelle 147. The Uelle 147 is the drive shaft for the belt conveyor. In order to keep the correct tension in the belt 145, a tensioning pulley 148 (Fig. 16)

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provided, which sits on a stub axle 150, which is attached to an adjustable Arm 152 is attached.

It is essential to the invention that the bag machine is provided with intermittently working, compressed air-loaded intake pins for feeding the film to the closing strip. The upper intake barrel is coupled to hydraulic or pneumatic type working cylinders. Pneumatic cylinders are preferable here. The working cylinders regulate the contact pressure between the rollers depending on the requirements, as they are given by the thickness of the film or the production of bags with or without zuickel. It is clear that in the production of bags with gussets, one edge of the foil receives a folded back fold so that four layers of foil lie on top of each other, so if you would keep the pull-in pins in a parallel position, either the pressure on the Zuickel would be too strong , if the correct contact pressure is maintained at the bag opening, or if there would be no contact pressure at all at the bag opening unless the contact pressure on the zuickel would have the value required for the film advance. Accordingly, according to the invention, the upper retraction pin can be adjusted so that it assumes a position slightly deviating from the parallelism to the lower intake pin. In this way, a uniform contact pressure across the width of the film can be achieved in the manufacture of bags with gussets.

This design feature of the invention will now be described with reference to FIGS. 3, 4 and 5. Reference is first made to FIGS. 4 and 5, in which the compressed air-loaded intake rollers 84, consisting of an upper intake roller 446 and a lower intake roller 454, are shown. The upper draw-in roller 446, which extends between the side plates 52 of the frame, is received at its ends in bearings 448 , only one of which is shown in FIG. The bearings are mounted in blocks 450 which are pivotably connected to the side plates 52 by means of bolts 452 which act as pivot pins for the blocks 450 The lower feed roller 454 is rotatably received in bearings 456 in the side plates 52 and has an extension 458 ( 5, right) on which a fly pulley 460 sits, around which a belt 462

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is led. A gear 464 that runs on the lower feed roller sits at a point near the right side plate 52, see FIG. 5, meshes with an additional gear wheel 465 da3 in turn a gear 466 keyed on the locking roller 106 is engaged. In this way, the closing roller 106 becomes the same Rotated towards the lower feed roller 454. Both drafts have grooves 468 in which an upper and a lower set of scraper fingers 86 bzu. 88 are arranged. The upper scraper fingers 86 are individually screwed to the rectangular crossbar 90, both ends of which are attached to the blocks via brackets 476 450 are attached. The lower stripping fingers 88 are attached to the crossbar 91, which is also by means of the same boom 478 is fixed to the side plates 52, · |

At a point between the bearings 448 in the block 450 and the screw bolt 452, outwardly protruding pins 400 are screwed into the block 450, which protrude through a somewhat cross-shaped opening 482 in the respective side plate 52 (FIG. 5). Cylinders 484, which are preferably pneumatic and single-acting cylinders with pressurized fluid only at the head end, are mounted on top of side plates 52 in such a position that a plane through the axis of cylinder 484 is also the axis the pin 480 includes. The cylinder has a protruding piston rod 490 which is in contact with the top of the pins 480, while the bottom of the pins 480 are in contact with springs 492 which are in a branch 494 of the cross (

Slot 482 are arranged . Due to this construction, the reciprocating action of the cylinders 484 and the springs 492 can control the contact pressure between the feed rollers 446 and 454, since the upper feed roller 446 is rotatably mounted in the blocks 450, which in turn are hinged to the side plates 52 via the screw bolts 452. If required, a different pressure can also be applied to the two ends of the upper intake tube 446. Of course, the usual control elements are provided for regulating the supply of pressurized fluid to the cylinders 484.

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The intake conditions work as follows: Uenn a new roll of film is threaded through the bag machine, the lines 486 are not pressurized with fluid; consequently they remain Springs 492 operate and rotate the blocks 450 counterclockwise in Figure 4. This of course causes the upper feed roller 446 raised and with it the stripping fingers 86, which are also from the blocks 450 are held. This creates enough space between the feed pins 446 and 454 to accommodate the film easy to thread through. At the beginning of normal operation of the machine, the control circuit switches U-valves so that they pressurized fluid through lines 486 into cylinders 484, whereupon piston rods 490 are extended and one down exert a directed force on the pins 480, which overcomes the force of the springs 492. This will secure the blocks 450 around the pivot pins 452 pivoted and there is a contact pressure between den -inzugualzen 446 and 454, the strength of the contact pressure leaves They regulate because the pressure of the working fluid that the cylinder 484 acted upon by the machine operator without difficulty can be regulated. Unless, as already mentioned, the contact pressure is to be compensated for in the event that gussets are provided Bags are made, the pressure of the pressurized fluid can be applied to each of the two cylinders 484 can be specially adjusted and the upper feed roller 446 can have a slight deviation from the Assume parallelism to the lower feed roller 454

Once the machine is stopped, the control system can readily be energized to open lines 486 for venting the cylinder 484 connects into the atmosphere * Under this "condition The springs 492 exert an upward force on the pegs 480 which counteract the blocks 450 in FIG clockwise about the pivot 452. It is thus evident that the feed pins of the invention Bag machine are controllable so that they have a certain contact pressure exercise, which is simply lifted when the machine stops. By applying different pressures to the two cylinders 484, the contact pressure during the production of Match the gusseted bags.

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Claims (1)

Claims Einzugualzen, especially for a machine for manufacturing of bags, with a film web, which υοη a supply roll deducted uird, characterized in that the draw-in pins (84) with a device (92) for controlling the on the film web and for releasing this pressure when the machine is stopped are. Device according to Claim 1, characterized in that the device for controlling the contact pressure is hydraulic or pneumatic cylinder (484) having a Einzugauze (446) press against the other feed pin (454) and establish a firm contact between the feed pin and the film web. Apparatus according to claim 2, characterized in that the cylinders (484) on each end of the one intake pin (446) exert a force and means (492) are provided to lift the feed pins from one another when the pressure of the working medium drained from the cylinders. Device according to Claim 2 or 3, characterized by levers (450) aligned in the transverse direction, one end of which is pivotally attached to a side plate (52) of the machine frame, at the other end of which bearings (448) are arranged, in which the one retraction pin ( 446) is received, and a pin (480) is rigidly attached to the middle part , with which the piston rod (490) of a working cylinder (484) in 109839/0089 Contact is, uelcher, stationary on one stone plate each (52) is mounted while on one of the piston rod opposite Place of the pin (48G) engages a spring (494), which presses uen pin against the piston rod, whereby bui loading of the cylinder with pressurized fluid, the piston rod; exerts a force on the pin that pulls the fenders toaaniriujna and shifted the lever in such a way that the stored feeder rolls against the other feeder roll and a pressure test is exerted on the film web in between. 5. Device according to one of claims 2 to 4, characterized in that that the pressure of the working medium for each of the two cylinders (404) can be selected independently, so that at both ends the one feed roller (446) different contact pressures come about. 109839/0089