DE2104440B2 - Bag stacking - using accelerating unit for bag end to clear high-speed supply conveyor - Google Patents

Abstract

Designed to handle sacks and/or bags of plastics film, the bags are fed by a high-speed conveyor, to match the high output of bag prodn. At the end of the conveyor the bag is grasped by grips on a slower-moving conveyor, and the end of the bag is accelerated to clear it before the next bag is grasped. The bag forms a loop, its end trailing along a plate until the grips open to deposit it in a stack in a magazine.

Description

of doubles

Sute

place is only operational when the individual workpieces through the high-speed conveyor are moved downwards in a vertical direction; because that's the only way to take the workpieces when crossing the necessary large distance between the fast and the slow moving conveyor vertically hanging position in their conveying level, in which they are with sufficient security in the gripping area of the slowly running gripper conveyor, provided they are not caused by external influences, e.g. B. commute to the side by air movement. The well-known The design of the transfer point also requires that the workpieces are mutually sufficient Have clearances on the high-speed conveyor so that the swiveling guide plate is still ahead the arrival of the next workpiece can be moved back to its starting position.

With the horizontal conveying level of the high-speed conveyor, which is due to the construction of most Hoch-1, 'isiuntis sack and bag machines, the well-known design of the transfer point is unusable. The workpieces, which are moved forward at high speed in hori- /. The safe threading of ^ri " ^h1 "^tf> deAverk.99 pieces into the gripper of the slow-running tire conveyor is therefore excluded.

The invention is based on the object of creating a device that can also be used in horizontal Conveyor level with high conveying speed without overlapping workpieces moving one behind the other the safe transfer into the slow moving, the desired imbricated formation of the workpieces forming gripper conveyor guaranteed.

Based on a device of the type described in more detail at the outset, this object is achieved in that a uniformly rotating chain pair is provided which crosses the high-speed double belt conveyor and the gripper conveyor at the transfer point of the high-speed double belt conveyor and that the pair of chains surrounds the gripper conveyor and the stacking device that may be assigned to it. Through the cross bars while the rear workpiece parts arising from the high-speed Förzerer in the opposite direction of rotation side conveyor are erg '' · ^ invention to-Another possible eu £ _t ^. ^ ^

^ £ the fast moving one

running _le "couple is arranged,

high-speed Dop ⁱ _{of those in common.}

circumferential speed _d iki ds

whose Fo de ■ bene d £
pelbandfordu- '" ^nd £ _d coll

same demand, ^^^ _{speed of} the ^ "^ f double belt conveyor and its individual rollers, one of which is arranged above and the other below the common Fordereoene conveyor,

The Vorzienroueiipatii closes as soon as the workpiece is gripped by the gripper of the gripper conveyor at its leading edge, with the result that the part of the workpiece still in the area of the high-speed double belt conveyor accelerates from the latter to the transfer point and at the same time an orderly loop is laid on the conveyor. uci uuin. UU3 accelerated pulling out of the rear workpiece part from the following workpiece is sufficient to open the pulling roller pair again in good time before the front edge of the next workpiece arrives, even at high production rates.

In connection with sack and bag machines, the workpieces are also in a horizontal conveying level move forward is according to a further embodiment of the invention that takes up this idea the overall order of the device according to the invention is preferably made so that the slow-running Gripper conveyor is guided and driven in such a conveying direction that the workpieces - as is known per se - over the longer conveying path between the transfer point and the drop-off point be promoted. This arrangement is particularly advantageous when the workpieces have not yet cooled down Have welds, as it is, for. B. is the case when the same in the bag machine by Cross welds were severed from a hose web. Such workpieces must be in front of her

nuuMuiM ^ Mvo. Stacking enough time to cool the

which are pulled out so that the transfer point, i.e. welds, are given so that they are in the stack the spacing between the high-speed conveyor 50 does not stick together. Over the discussed overall

■ '- ■ - arrangement, the workpieces are initially from gripped the upper gripper chain before they are dug over from the lower to the stacking device. she have enough time to cool down with a relatively short overall length of the device according to the invention their welds.

Since the workpieces are naturally in a loose shuffle in the upper, longer run of the gripper conveyor

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Ul-I r \ l; .nuuv. .- ...

and the slowly running gripper conveyor can be dimensioned so that the leading work The corner edge is threaded into the gripper of the gripper conveyor with full safety without impermissible deflection will. The rope pulling out the workpiece ensures that the rear end of the workpiece is even then no longer in the trajectory of the

following workpiece is located if the ge oes ureueimiutiku ..u>". _fe ~

Mutual workpiece distances to one another are very small penformation on top of one another, it can be easier are. Furthermore, the continuously rotating chain allows one workpiece to come into contact with the one in the cold

few weld seams of the neighboring com-

the rods too. It is both in conjunction with a men. In order to avoid possible mutual baking

Avoiding the workpieces with the upper as well as with the lower of the workpieces is at least one

tere strand taking over the gripper conveyor part of the longer conveying path of the gripper conveyor reversible. It is also to be observed, and of this makes 65 guided in wave-shaped guides. This

Another idea of the invention use - that move the workpieces during their advance

between the transfer point and the drop-off point there is a constant mutual movement in the upper gripper run

a longer one in the one direction of rotation and a kür- shifts, which the mutual caking with

Prevent security.

The one just discussed, equipped with the constantly revolving pair of chains and rods attached to them In the area of the transfer point, the device pulls the "tails" one behind the other without overlapping located workpieces after just from the high-speed moving the workpieces Conveyor and moves at a much higher speed in the transport direction of the Gripper conveyor ahead as it moves the front workpiece parts grasped by its grippers (the "tail" overtakes the "head"). As a result, it can be long, especially when it is in the direction of transport Workpieces, for overturning the workpieces above the upper gripper chain center and thus lead to faulty scale formation.

In order to avoid this, according to a further inventive concept, close to the transfer point is between the upper run of the gripper conveyor and the upper run of the chain pair moving the bars forward a stationary deflecting rod extending across the width of the workpieces is arranged. The deflecting rod prevents the workpieces from turning over onto the shed row by pushing the from correctly folds the workpiece ends carried along with the rotating rods into the imbricated formation.

Several exemplary embodiments of the subject matter of the invention are shown in side view in the drawings shown, namely shows

Fig. 1 shows a device for depositing without overlapping one behind the other from a bag machine discharged plastic bags in scale formation with a arranged at the transfer point, controlled pair of pull-out rollers,

F i g. 2 the device according to FIG. 1 with a pendulum rod at the transfer point,

3 shows another arrangement of the device according to FIG. 1 with uniformly rotating in one direction Bars,

FIG. 4 shows a cross section of the device according to FIG. 3 along the line IV-IV.

The double belt conveyor 1 is used to discharge the bags B emerging from the bag machine, not shown in the drawing, one behind the other without overlapping, and only holds the bag between its individual belts with light pressure so that the bags can slip between the belts under the action of external forces.

The double belt conveyor 1 is followed by a gripper conveyor 2. The gripper conveyor consists in a known manner of a pair of endless chains 3, which run on guide chain wheels 4, 5 and which are occupied at equal pitch t with gripper strips 6 extending over the width of the bag β. The grippers 7 of the gripper strips 6 are opened and closed by stationary control rails not shown in the drawing. The conveying speed of the gripper conveyor 2 is smaller than that of the double belt conveyor 1. Accordingly, the pitch ι of the gripper strips 6 is smaller than the pitch of the bags B during their transport in the double belt conveyor 1. The gripper conveyor 2 is arranged according to Fig. 1 so that its The lower run falls into the conveying plane EE of the double belt conveyor 1 and runs in the same transport direction α as this one. Its distance from the double belt conveyor 1 at the transfer point A is so small that the bags B running out of the double belt conveyor 1 with their leading edge cross the transfer point A in a straight line and then run safely into the open gripper 7 of the gripper conveyor 2.

At the transfer point between the fast conveying double belt conveyor 1 and the slowly conveying gripper conveyor 2, a pair of pulling rollers 8, 8 'is arranged so that its conveying plane FF

ίο crosses the EE funding level of the aforementioned funding agencies 1, 2. The lower roller 8 of the pulling roller pair 8, 8 'is fixedly mounted below the conveying level EE at the outlet end of the double belt conveyor 1, while the upper roller 8' above the conveying level EE can be moved back and forth against the lower one in the working cycle of the device. The circumferential speed of the pulling roller pair is greater than the conveying speed of the double belt conveyor 1.

As soon as the front edge of the bag B running out of the double belt conveyor 1 at high speed has been gripped by a gripper bar 6 of the slow-running gripper conveyor 2, the pair of pulling rollers 8, 8 'is activated by moving its upper roller 8' downwards. This will make the

»5 kmtere part of the bag B is pulled out of the double belt conveyor 1 at an accelerated rate, which, as indicated above, lets the end of the bag slip under the pull of the pulling roller pair 8, 8 '. This directs the rear part of the bag B to form an orderly loop 5 out of the plane EE downwards and allows the free end of the bag to fall onto a table top 9 parallel to the gripper conveyor 2. The time gained by the accelerated pulling forward of the end of the bag is sufficient to move the upper pulling roller 8 'back to its upper starting position in good time before the next bag B leaves the double belt conveyor I. The gripper conveyor 2 drags the bags B ahead in the loosened imbricated formation shown in FIG. The gripper conveyor 2 is so long that the weld seams of the bags are cold when they are dropped into the stacking device.

The pulling roller pair 8, 8 'is on the periphery with polytetrafluoroethylene coated to prevent the weld seams from sticking. It can already be immediate be moved apart before the arrival of the bag end, so that the trailing The cross weld seam located on the edge of the bag is only loosely in contact with the lower pulling roller when it runs out 8 arrives.

The device shown in FIG. 2 differs from that according to FIG. 1 in that, instead of a pair of pulling rollers 8, 8 'at the transfer point A, a rod 11 is provided which extends across the width of the bag B at right angles. The ends of the rod 11 are attached to lateral swivel arms 12 which are arranged in such a way that its swivel path b crosses the conveying plane EE of the conveyors 1 and 2 at the transfer point A. The rod is driven by means of any drive known per se in the working cycle of the device and with such a timed sequence of its pivoting movement that it accelerates the bag B, which has just been gripped by the gripper conveyor 2, during its downward movement, forming a loop 5 '

pulls out the double belt conveyor 1 and returns to its upper starting position during the period of time gained before the next bag B crosses its pivoting path b.

In the embodiment according to FIGS. 3 and 4, the arrangement of the slowly conveying gripper conveyor 2 is such that it takes over the bags B with an upper run from the double belt conveyor 1, conveys the guide chain wheel 5 'to its lower run and there onto the one below arranged stacking belts 13, 14, which gradually circulate transversely to the gripper conveyor 2 and discharge the stacks of bags formed to the side.

On the individual chain wheels of the chain wheel pairs 15, 15 '; 16.16 '; 17, IT; 18, 18 'runs around a pair of chains 19, 19' which is filled with a plurality of rods 11 'at equal pitch t " . The ends of the rods 1Γ are attached to the individual chains of the pair of chains 19, 19' and extend at right angles across the width of the gripper conveyor 2. The arrangement of the pairs of sprockets 15 to 18 is, as FIG The path of movement crosses the conveyor plane EE at the transfer point A. The bars 11 'run in the same direction of rotation α as the gripper conveyor 2. Their rotational speed is greater than the conveying speed of the bags B moved one after the other by the double belt conveyor 1 without overlapping.

The upper run of the gripper conveyor 2 is guided by rollers 20, 20 'in lateral, wave-shaped guides 21, 21' in order to make the conveying movement of the bags B, which are stacked on top of one another, non-uniform and thereby to cause the latter to move over and over again, causing the bag B prevent the still warm weld seams of the adjacent bag B.

Between the upper run of the gripper conveyor 2 and the upper run of the chain pair advancing the bars 11 ', a deflecting bar 22 is arranged near the transfer point A , which extends over the width of the bag B.

During their upward movement at the transfer point A , the revolving bars 11 'hit the bags B already gripped at their leading end by the gripper conveyor 2 and pull the trailing part upwards out of the double belt conveyor 1 in an accelerated manner, forming a loop S ". the free bag end up to

ao in their upper run, where it slides off them and falls in an imbricated formation onto the upper run of the gripper conveyor 2. Bags B, which are long in the transport direction, are thereby supported by the high-speed rods 11 ', as shown in FIG. 3, with their free end

»5 slowly moved forward by the gripper conveyor 2 Moved leading edge away and dropped onto the deflecting rod 22, which they in the further Verlaul their slow forward movement through the gripper conveyor 2 in the illustrated, ordered imbricated formation kills.

The bags arrive in this imbricated formation in the lower run of the gripper conveyor 2, from which they dropped onto the stacking belts 13, 14 who the.

1 sheet of drawings

309550/8!

Claims (5)

Patent claims: 1. Device for depositing flat, pliable workpieces, eg. B. pieces of tubing, bags or sacks made of plastic film, with a high-speed conveyor, e.g. a double belt conveyor and a slow-running, the workpieces ar their leading end with grippers gripping gripper conveyor, which is optionally assigned a stacking device, characterized in that a uniformly rotating through in Cross bars (H ') arranged at intervals corresponding to the cycle time of the machine, the conveying level (EL ) common to the high-speed double belt conveyor (1) and the gripper conveyor (.'I) at the transfer point (A) of the double belt conveyor (1) (19, 19 ') is provided, and that the pair of chains (19, 19') surrounds the gripper conveyor (2) and the stacking device (13, 14) possibly assigned to it. 2. Device for depositing flat, pliable workpieces, eg. B. hose pieces, bags or suckers, made of plastic film, with a sch .ellaufenden conveyor, z. B. a double belt conveyor un J a slow running, the workpieces ar. i: .rem leading end with grippers eifa; ser Jen gripper conveyor, which is optionally assigned a stacking device, characterized in that at the transfer point (A) between the high-speed double belt conveyor (1) and the slow-running gripper conveyor; r (2) a pair of pulling rollers (8, 8 '), whose conveying level (FF) crosses the conveying level (EE) common to the fast-moving double belt conveyor (1) and the gripper conveyor (2), the peripheral speed of which is greater than the conveying speed of the high-speed double belt conveyor (1) and its Individual rollers (8, 8 '), one of which (8') is arranged above and the other (8) below the common conveying level (EE) of the conveyors (1, 2), in the working cycle ', can be moved against one another 3. Apparatus according to claim 1, characterized in that the slowly running gripper conveyor (2) is guided and driven in such a conveying direction that the workpieces (£) -as known per se - over the longer conveying path between the transfer point (A) and Ablegestclle (13, 14) are promoted. 4. Apparatus according to claim 3, characterized in that at least part of the longer Conveying path of the gripper conveyor (2) is guided in wave-shaped guides (21, 21 '). 5. Apparatus according to claim 1, 3 or 4, characterized in that near the transfer point A between the upper run of the gripper conveyor (2) and the upper run of the chain pair (19, 19 ') advancing in the bars (H') is a stationary one , is arranged over the width of the workpieces (B) extending deflecting rod (22). The invention relates to a device for depositing one behind the other without overlapping moving, flat, pliable workpieces, e.g. B. pieces of tubing, bags or sacks Plastic film, with a high-speed conveyor, e.g. a double belt conveyor and a slow one ongoing, the workpieces at their leading end with grippers gripping gripper conveyor, the if necessary, a stacking device is assigned. The high production output of modern sack and bag machines, the pliable plastic films process, it no longer allow the high transport speed without overlap Workpieces emerging from the machine one after the other to reduce their transport speed free to drop onto a slow moving conveyor belt to keep your moving at high speed To convert row formation into a slowly moving imbricated formation from which the workpieces are trouble-free transferred to a stacking box or on stacking collars and stacked with the same edges can graze in a pile. This known stacking method is only proportionate to workpieces rigid materials, e.g. B. Paper applicable. in contrast to those made of pliable plastic films when thrown onto the slow-moving one Conveyor belt and from this into the stacking box retain their flat shape and throwing direction with security. Due to their flexibility and surface smoothness, workpieces made of plastic films experience uncontrollable shifts to the side or rotations when they are thrown, and the workpieces often overturn. In order to avoid this, the workpieces that arrive without overlapping are usually transferred to a slowly running gripper conveyor, which grabs them with my gripper strips at their front edge and transfers them into the desired, slowly running imbricated formation. This results in new difficulties, again due to the pliability of the plastic films; because at the transfer point between the conveyor feeding the workpieces without overlapping at high conveying speed and the slow-running gripper conveyor forming the imbricated formation, the workpieces experience uncontrollable compression because their leading end is moved forward by the gripper conveyor at low speed and their trailing end at high speed. The upsetting of the trailing workpiece often obstruct the path of the following workpiece, so that its leading edge misses the gripper of the gripper conveyor.
These difficulties can be avoided if, according to the applicant's German patent specification 1280 651, the conveying plane of the work pieces is vertical! and the distance between the high-speed conveyor advancing the individual workpieces and the gripper conveyor forming the imbricated formation is dimensioned so large that the part of the workpiece grasped by the gripper conveyor that follows at the speed of the high-speed conveyor has enough space to move under the action of gravity and steered by a swivel Always place the guide plate on one side in an orderly loop that does not block the path of the following workpiece to the gripper conveyor. This known embodiment of the handover