DE2410347A1 - BAG FILLING DEVICE WITH MULTIPLE SCALES - Google Patents

Description

OR.-INS. DIPU-INa. M. IC. HIPL-PHYt. OR. DIPL.-PHY ». HÖGER - STELLRECMT - GP «ESSBACH - HAECKER PATENT LAWYERS IN STUTTSART

February 19, 1974 "Acyclic filling"

SIG Swiss Industrial Society,

8212 Neuhausen am Rheinfall / Switzerland

Bag filling device with several scales

The invention relates to a bag filling device several scales, which are arranged along a cup conveyor track and empty weighed product portions into these cups, which in turn emptied into bags at the end of this conveyor track, which are conveyed on a bag conveyor track. at known bag filling devices of this type are the scales compulsorily emptied into the latter in a certain cycle in time with the forward movement of the cup. Since you have to be sure that every balance has ended the weighing correctly when it was emptied, and since the weighing time depends on various factors, in particular the size of the required portions and the type of filling depends, a relatively long time is provided for each cup step, which time the average weighing time by one exceeds a significant margin of safety. The invention is based on the idea of reducing the performance of the filling device to enlarge this margin of safety without taking the risk.

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- accept unfilled or insufficiently "filled bags must, and at the same time to enable better adaptation of the device to changes in the portion size and / or the contents. The bag filling device according to the invention is distinguished for this in that a control device is provided is, which checks whether the are located at the outputs of the scales Cups are empty or already filled, and which controls the locking devices assigned to the scales, which trigger the release allow emptying of each scale whenever the same

"The weighing of a product portion has ended - and the one at its exit the cup is empty. The scales are emptied not in a specific cycle, but acyclically and always when a weighing is finished and an empty one Mug is available.

The drawing shows an exemplary embodiment of the subject matter of the invention shown schematically. It is:

1 shows a mechanical diagram of the filling device, Figi 2 an associated electrical scheme,

Fig. 3 is an elevation of one contained in the filling device Marking device, and

FIG. 4 shows a plan view of some parts of FIG. 3.

The bag filling device shown has according to FIG. 1 a Bag conveyor track 1, which is for example at the exit of a bag folding machine, which open top bags 2 in the direction of arrow 3 delivers. The bags 2 are not shown, known conveying means in the with the work cycle of the folding machine corresponding work cycle of the device along the path 1 moved. The empty bag comes under in position 2 ^

409844/0264

the output 4 of a cup conveyor track 5, on which cups 6 are conveyed step by step in the working cycle of the device or continuously in the direction of arrow 7 by conveying means (not shown). The cups 6 can for example be attached to an endless chain, only the cups of the upper run of the chain being visible in FIG. 1. Along the path 5 are three automatic scales 8 <| / 8 ₂ and 8g, under the exits of which the cups marked 6 / j, 6- / J and B ^ ₁ are located. The outputs of the scales 8 and the output 4 of the track 5 are only shown horizontally for graphic reasons and the last cup of the track 5, labeled 624, is already in the tilted position at the right turning point of the endless conveyor chain, so that its contents are in the bag 1. emptied. An electrical AND gate £ L or 9 ₂ and 9g is connected to each of the scales 8. Cables 10 <| lead from the AND gates 9 or 1O ₂ and IO3 to a cup control device 11, which checks whether the cups 6 ** or B _{2 -] located under the exits of the scales B 2} and 8g are still empty or have already been filled by a preceding scale or .diB records the fillings originating from the individual scales. The control device 11 is also connected by a cable 12 to a marking device 13 which _{marks on the already filled bag 2 2} located with it, by which of the three scales 8 its filling has been weighed. On the marking device.

13 is followed along the path 1 by a bag control device 14, which checks whether the bag 2g located with it has been filled at all or not. As a control device 14, for example, in a known manner, a very rapidly operating, low-precision scale can be used. If the bag 2g is empty or has a gross filling deficiency, the same is in position 2., ie

after two conveying steps through one through the control device

14 controlled slide 15 detected and in the direction of arrow 1B

^a broke chute pushed uf 17th The filled bags 2q leave the web 1 in the direction of the arrow 18 to be in a bag

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closing machine closed and possibly still further packed, to be sent stacked.

The cups control device 11 comprises according to FIG. 2, three para.llel arranged shift registers 19,., 19 _2> ^ 3 »which θ the scales or the Uend gates 9 are assigned by the same index. Each shift register 19 has twenty-six stages 20 and is connected on the input side to a common pulse generator 21, which supplies the registers 19 with a shift pulse each time a contact 22 is closed. The contact 22 is closed in the work cycle "of the device, but with an adjustable phase.

Each stage 20 can be in a known manner only in one or are in the other of two states, which in the present case are denoted by L, i.e. empty, and B, i.e. occupied should. With each shift pulse, the state L or B becomes the next stage passed and stage 20. in state L brought.

Each of the scales B has a standby contact 23-] or 23o and 233, which is automatically closed when the scales to which the, for example, powdery filling material flows, has weighed a portion of the bag. By closing the contact 23, the corresponding AND gate 9 receives, for example, a positive voltage. The AND gates 9 are also connected by lines 24, 24 ₂ and 24g to a common pulse generator 25, which supplies the same a positive trigger pulse each time a contact 26 is closed. The contact 26 is also closed in the working cycle of the device, with an adjustable phase, and determines the point in time at which one or more of the scales B may be emptied. Emptying takes place when the relevant AND gate 9 is open, in that ^{an output pulse is passed from the latter via a line 27-p or 272 and 27} 3 to the relevant scale 8, which causes the emptying.

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When the AND gate 9 * is open, ie its two entrancesB are positive, the balance 8. empties into the cup 6, .. At the same time, the AND gate 9. sends a "filled" meaning via a second output line 28 Information pulse to the first stage 20. of the shift register 19-j. The steps 20 to 20 ₄ of each shift register 19 are the twenty-four positions cup 6 to 6 ~. assigned. As a result of the "filled" information sent out when the scales 9 are emptied, the level 20, which was originally in state L, is changed from .19. brought to state B. Since the state B shifts by one step with each pushing pulse coming from the pulse generator 21, it can be seen that when the filled cup 6. comes into the position 6 .., the step 20 .. previously had the state L, in the Condition B is coming. The AND gate 92 has a third input line 29 ^, which connects it to the stage 20 .. of 19. As long as the level is 20 .. in the state L, they are over the line 29 _2, a positive voltage to the AND gate 9 ₂ so that the latter is open, even if his other two input lines are positive. If the level 20 .. of 19 ,. comes to state B, the line 29 ₂ becomes negative, the AND gate 9 ₂ therefore does not emit an output pulse to the balance 8 ₂ via the line 27 ₂ , even if the other two lines of the AND gate 9- are positive, ie the scale 8 ₂ cannot empty into the cup filled by the scale 8 * in position B ... If, however, with the ready contact 23 ₂ closed, at the moment of the trigger pulse coming from the pulse generator 25, the cup in position 6 .. is empty (i.e. 20 .. of 19th is in state L), then gate 9 ₂ outputs via line 27 ₂ an impulse to the balance 8 ₂ , which empties into this cup B ... At the same time, the AND gate 9 ₂ outputs "filled" information to the stage 20 .. of 19-, via a line 28 _{2, indicating which stage is brought into state B as a result.}

The UndfTor 9 ^ has a third and a fourth input line 29q or 30o, -whose polarity from the state of stages 20-. from

_ ₅ _ 409844/0264

19 ,. or 2O _2,. is dependent on -19 _2. If the cup in position B _{? 1 has} been filled by one of the scales B ₁ or 8 ~, then you will find level 20. from 19 .. or 19 ₂ in state B • and 'because not all four inputs of the AND gate 9- are positive, the scale B _{3 can} not receive an output pulse via 27- and thus cannot empty itself. If all four inputs of the AND gate 9_ are positive, the scale 8- empties into the cup .62- and level 2Q ₂ . from 19 * is brought into state B via an information line 2Bo.

It is clear that, even with the device described, only then will all the cups 6 move into the starting position B ₇ in the filled state. the cup conveyor track 5 come when the weighing time of the scales Θ, ie the time they need to carry out a weighing until the ready contact 23 closes, is not too long in relation to the duration of the work cycle of the device. But you are not bound to the fact that the scales have to work rigidly in the work cycle of the device, as in the case of the bag filling devices with several scales that are emptied according to a fixed cycle into cups conveyed on a conveyor track and the safety margin can be significant be smaller, especially if significantly more than three scales are provided to achieve very high performance.

The last two stages 20-j- and 20 ~ _{R of} the shift registers 19 correspond to two steps which the bags filled at the output 4 of the cup conveyor track 5 must carry out 2. in order to get to the position 2 ₂ in which they are in the The working area of the marking device 13 are located. As already mentioned, the purpose of the marking device is to mark on each bag 2 of which of the scales θ *, B ^ or B- its content has been weighed in order to be able to adjust the relevant scale B in the event of any weight errors.

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Each of the stages 20 ₂₆ is connected to the input of an amplifier 31 1, 31 ₂ and 31 ₃ , respectively. The outputs of these amplifiers 31 can be connected to an output circuit supply voltage V _{via three electromagnet windings 32, 32 2} and 32 _{3 provided in the marking device 13 and a common contact 33.} The feed contact 33 is closed in the operating cycle of the device with a phase that can be set for adjusting the marking device. If the

Level 20 "" is in state B, which is normally always Zb

is the case with one of the three shift registers 19 .., 19 ₂ or 19 ₃ , the corresponding electromagnetic winding 32 is traversed by output current of the amplifier 31 concerned when the feed contact 33 is closed, so that it counteracts the action of a magnetic core 34 shown in FIG 3 and 4 tighten. As a result, an embossing _{die 36, 3B 2} or 36- is brought into an embossing position, as is shown in dashed lines ^{at 36 'or 36g 1, for example.} In the embossing, the embossing die 36 ₃ 'is located under an unfolded flap 37 of the filled package 2-.

The embossing device 13 also includes an embossing hammer 38, which is at 39 is pivotably mounted. The hammer 38 is provided with a roller 40 which by a spring 41 against the circumference of a on a Shaft 42 seated profile cam 43 is pulled so that at each Cam rotation of the embossing head 44 of the hammer is raised and lowered. It can be seen that the embossing head 44 in its lower Layer 44 'with the embossing die that came into the embossing 36' 36 cooperates and thereby a marker located on the latter and assigned to the relevant scale 8 the flap 37 stamps. It is clear that in a very similar way, instead of an embossed mark, a colored or printed mark can also be used could be done.

Returning to FIGS. 1 and 2, it should also be noted that the cable 1O _{1 is} the line 28 ^, the cable 1O _{2 is} the lines 28 ₂ and 29 ₂ , the cable 1O _{3 is} the lines 29 _{3 , 3O 3} and 28 ₃ , and the cable 12 the

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bonds 31 to the solenoid windings 32 contains. It is also noted that the shift registers 19 need not necessarily have the same number of stages 20, as has been shown for the sake of clarity. Since levels 2O ₁ - 2O ₁₀ in register 192 and even levels 2O ₁ - 20 _2Q in register 19 ₃ are always in the L state, they can be omitted. It is also conceivable that means other than shift registers can be provided in the control unit 11 in order to transfer the information that a certain cup 20 has been filled by a preceding scale, eg "8,., To the following scales, eg By and Β-, to pass on and thereby block the emptying of the latter into this cup. Finally, the control device could also contain tactile means, e.g. mechanical, optical or electrical type, which each scan directly the cup located under the exit of a scale and - when it is empty - Feed an input of an AND gate 9 assigned to the balance 8, each with three inputs, a voltage of the same polarity, such as a standby contact 23 and a pulse generator 25 to the other two inputs.

In the present filling device, only three scales 8 have been provided for reasons of illustration. In practice however, as already indicated, to achieve the high performance, for which the acyclic triggering of the scales is particularly important it is advantageous to use significantly more scales. It can be advantageous not only on the cup conveyor track 5 To convey one, but e.g. two rows of cups parallel to each other and two cups at the same time in two on the bag conveyor track 1 bags in a row to empty. In this case, the steps on the bag conveyor track would be duplicated as fast as those on the bucket conveyor.

-B-

409844/0264

Claims (11)

Claims ÖBäckrFilling device with several scales, which are along one Cup conveyor track are arranged 'and weighed product portions empty into these cups, which in turn emptied into bags at the end of this conveyor track, which are on a Bag conveyor track are conveyed, characterized in that a control device (11) is provided which checks whether the cups (6) at the outputs of the scales (8) are empty or already filled, and which ones Controls the locking devices (9) assigned to the scales (8), which always allow the emptying of the scales to be triggered when the same has finished weighing a portion of the product and the cup at its exit is empty. 2. Device according to claim 1, characterized in that the control device (11) has means (19) which when. Filling a cup (B ^) through a scale (8,.) Record a "filled" information and apply the same to the locking devices O2, 93) 'the scales (B ₇ , 8 _q ) are assigned, forward delayed in the time in which the filled cup is at the exit of one of these following scales, whereby the relevant locking device is effective to block the emptying of this scale. 3. Device according to claim 2, characterized in that each scale (8) is assigned an electrical shift register (19) is, which has successive stages (20. - 20 ".), which successive positions (6th - B ^) of the Cups (B) are assigned to the cup conveyor track (5), and that and gates (9) are provided as locking devices, " ⁹ " 409844/0264 f O which, firstly, trigger the emptying of a scale ready to be emptied under the action of a trigger pulse supplied by a pulse generator (25), and secondly when the scale is triggered in that stage (20, 2O ₁₁ , 2O ₂₁ ) of the associated shift register (19) that corresponds to the cup position (6 .., 6-11 * ^ 21 ^ ^{at the} output of the scales, supply the "filled" information, whereby the AND gates (9-, 9-) of the scales _{following the -first scales (S 1} ) (8 ₂ , 8 ₃ ) are controlled by the control device (11) via lines (29, 30) which they connect to the stages (2O ₁₁ , 2O ₂₁ ) of all shift registers (9) assigned to the balance output, so that if one of these stages ( 2O ₁₁ , 20 _{? 1} ) is reached by a "filled" information, the emptying of the balance into the filled cup (B ₁₁ , 6 ^ 1 ^ then located at the balance exit is prevented. ■ / 4. Device according to claim, characterized in that a marking device (13) is provided along the bag conveyor track (1) behind the exit of the cup conveyor track (5), which _{marks on each bag (2 2} ) from which scale ( 8) the product portion contained in it has been weighed by setting the marking to be carried out in this marking device by the shift register (19 .., 19 _? Or 19-) _{assigned to this balance in the last stage (20 2R).} 5. Device according to claim 4, characterized in that _{an amplifier (31) is connected to the last stage (20- R} ) of each shift register (19), in the output circuit of which an electromagnet winding ■ (32) is arranged, which when energized acts on a spring-loaded magnetic core (34) and thereby an embossing die (36) with a marking assigned to the corresponding scale (8) in the embossing position (36 ¹ ) under an embossing head (44) of a - 10 - 409844/0264 The stamping hammer (38) moved up and down the web (1) so that the marking is stamped _{into a tab (37) of the bag (3) on the marking device (13).} B. Device according to claim 1, characterized in that the control device controlling the cup filling state has tactile means, each of which is directly on the Scan the cup at the exit of each balance and block emptying of the balance if the cup is already full is. ¹¹ "409844/0264