DE2209481A1 - METHOD AND DEVICE FOR WEIGHT CONTROL OF A SERIES OF PACKAGES OF SPECIFIED TARGET WEIGHT - Google Patents

Description

PATENT LAWYERS

dipping. LUDEWIG Dipl.-Phys. BUSE graduate phys. MENTZEL

Password; "Checkweigher"

Firna Berkel GmLdI., 41 Duisburg, Auf der Höhe

Method and device for checking the weight of a series of packages specified target weight

The Urfiridung initially directed to a method for weighting- tskontro'lle a series of packs predetermined Goll weight uit ainzelstückweiserErfassung in Istgewichtsklassen adjustable weight interval width. Furthermore, the invention is directed to a device comprising a / cige device with a weight class divided into: 7 give rich.

i'.r, is orforderlioa to check whether unf. in which.! Around a predetermined weight; 3 target weights for packs of a series are adhered to. I-fan sold this to Haagen, who independently or from the country classify a 3erio of Pac3; some in different, pre-determined weight clears. In the case of fully automatic ■ Jaagen, pan assigns independent counting registers to the individual weight classes, in which ciia number of pieces of the recorded PackaiKjen is added up in class.

D;: r Lj.:.cii c'jil dar jokonn ten work procedures and. Devices for the Gfix / ic'iL control consists in the evaluation of the

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results obtained from a series of packs is very cumbersome. For this, the class-wise results subject to a calculation process, where they are related to each other and summarized, there are complicated, expensive computers required, which are not only expensive, but also easily prone to failure in their mode of operation. Furthermore, it cannot easily be overlooked whether given by adding one or more packs Actual weight improves the previous weight control result of a series of packs to a sufficient extent or deteriorated in an intolerable manner. To do this, the calculation process must be repeated.

The invention is based on the object of providing a method for To develop weight control where the control result is as simple, reliable and manageable as possible is to be obtained.

According to the invention, this is essentially achieved by that in a method for checking the weight of a series of packs with a predetermined target weight, each with a single piece Recording in actual weight classes adjustable weight interval width, initially one preselectable for each weight class positive or negative valence is permanently assigned, then the associated valence for each of the in a weight class falling packs of the series is determined and the determined valencies continuously true to the sign be netted.

It is then possible with the invention, after each detection individual pack can be recognized immediately by the balance value whether the group of packs to be checked is the one that has been recorded up to that point Series still tolerated in terms of their deviation from the target weight

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may or may not be. It is not necessary to add up multi-digit numbers, as would be necessary, for example, when recording actual weights. Furthermore, it is not necessary to also count the number of packs in an elaborate manner and to relate them to the above-mentioned result. It is also not necessary to summarize the packs falling into each weight class strictly separately from one another and, if an intermediate or final result is desired, to summarize the individual data. The invention takes a completely different, surprisingly simple way _f which makes it possible to distinguish between the packs falling into the various weight classes in terms of their effect on the test result to be determined. In the assignment of the positive or negative valence according to the invention to the individual weight classes, their class-wise influence on the end result is already taken into account in advance.

With the easily manageable order of the values is a significant part of the computational work required up to now ■ has already been carried out. By suitable choice of amount and The most important mathematical influence of the one falling into a weight class is the sign of the individual valencies Actual weight on the final result of the test. It is just a simple balancing that is true to the sign of the values necessary to achieve the desired examination goal reach. By differentiating between individual weight classes In terms of their value, they are also given an evaluation option in the form of a simple "key figure", which shows how the package in question is relative to the target weight, this criterion being a measure of the Allows comparison between packs of different target weights.

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The absolute amounts of the weights of the different classes initially depend on the type of weight to be carried out

after
control, then the weight-wise deviation of the relevant class from the specified target weight and finally mewkder weight-wise interval width of the relevant class in comparison with the other classes. Since when selecting the valences only their influence on the sought-after end result needs to be taken into account, ultimately only the relative level of the valences is important, which is why it is sufficient to use small numbers, if possible whole numbers, for the valences. These can be netted particularly easily. Furthermore, as has been shown, the invention achieves an extremely sensitive display of the end result with the simplest of means. Finally, from the deviation of the end result from the nominal value, it is immediately possible to read off how many packs of a certain class still have to be scanned so that the prescribed nominal value can still be achieved.

The invention is also directed to an apparatus for carrying out the method, which is characterized by a particularly simple structure, reliable mode of operation and cost-saving, manufacturing and low space requirements.

According to the invention, in a device of the type mentioned at the beginning, it is proposed that sensors connected to the weighing device, which respond in classes to the actual weight of a pack as triggering switching elements associated pulse generators in each case upstream, which has an output for delivery have a number of pulses corresponding to the respectively preselected class-wise valency, the outputs the pulse generator are connected to a common balancing unit, which is a signed, according to the train Coming valency, positive impulses adding up and negative impulses subtracting balance value display.

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Through the iJchaltglieJer, which depends on the respective present actual weight are set effective for each class, a number corresponding to the associated weight is obtained of positive or negative pulses to the balancing work. The implementation the valences in a corresponding number of pulses requires only simple, e.g. electrical components well-known type that work very reliably and practically without inertia, i.e. very quickly. this is the easiest option. But it would also be possible the valencies instead of a number of impulses through different impulse sizes an addressable balancing work to pass on.

The practical implementation of such a device depends on the control task set. Basically there is to fulfill two control tasks, both individually and in particular together in a single device can be realized, which then have a control function at the same time exercises in two ways.

If applicable, the mean value monitoring of the actual weight of the To carry out packs, the recorded weight range is the Weighing device symmetrical to the desired target weight, both in terms of weight interval width and in terms of the amounts of the weights classified, with the weight classes on both sides of the target weight weights have opposite signs and the value of the value of the individual weight classes is proportional increases depending on the weight difference to the target weight. The target weight or the one comprising the target weight The central weight class is given the sign of the neutral value "zero". The underweight classes, on the one hand Side of the target weight, received negative weight while

1 "

the classes on the overweight side are assigned a positive value. The balance value is for the previously detected group of packs kennzahl manner to the ar ~ ithmetischen weight average. This display is extremely sensitive and in this respect far superior to the known devices, as the following consideration shows:

iSs it can be seen that in the case of the invention, the center of the weight is 1-value a group of packs is then target weight equal to when the balancing works after checking the Packs the balance shows "zero". Now comes the supposedly large group of packs that have already been recorded a single pack, which is slightly underweight, so that it is in the first underweight class of If the value "minus 1" were to fall, the balance would change to "minus 1", although the Deviation from the target weight would possibly only have an effect in a position far behind the decimal point. The corresponding Of course, sensitivity arises when the weight average is only slightly above the desired target weight goes out. Despite this high sensitivity, the technical means required for this are modest.

Another of the above-mentioned control options is the proportion monitoring of the below an adjustable Packs under weight limit. But the invention also fulfills this task with very simple and one sensitive message-providing means. The total weight range recorded by the weighing device forms one weight class with positive value for pulse control of an assigned balancing unit. That below the underweight control limit lying section of this weight range

ί. ' 3 b S j! w ub C:

is used as a further weight class with negative value for counter-pulse control of this balancing unit. In this case, the two weight classes that act against one another overlap. Here, too, is the balance of the common balancing work shows whether too many or too few packs of the group recorded up to that point are below this limit, because one chooses the numerical ratio of impulse and counter-impulse - proportionally pro detected pack - equal to the percentage value of the proportion that is permitted below this limit of the packs. These relationships are explained in more detail using the exemplary embodiment described below.

We recommend those who are severely underweight and / or overweight Separate packs from the series of packs from the start and then of course not to be taken into account in weight control. For this purpose one closes the classified weight range of the weighing device on the underweight side and / or on the overweight side by a withdrawal limit away. Furthermore, a feeler element is provided which is ειπώ ^ ,, - clibar on the actual weights of the packings, the beyond the committee limit. This Fühigliaf: is old one connected in "off position" switchable switch, usually is held in "on-position" and thereby the transport path the "good" packs continue beyond the weighing rack, where the packs are gawiohtcontrolliart in transit will.

In cases, v / o in the mean value monitoring or outlier portion monitoring critical, too deep-lying wart attained there is great interest in future The packs of this series to be tested have to be excluded from those that change the present interim result even more unfavorably would. This interest does not apply until the permissible

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or desired mean values have been obtained. This can be • in the invention by simple additional components in Obtained within the scope of the invention. The aim is to sort out packs by setting the aforementioned switch in the "off" position, which are below the underweight monitoring limit already mentioned above, those by a fixed one Weight amount is above the aforementioned lower absolute reject limit. For this purpose one uses a auxiliary sensing element responding to actual weights below this underweight monitoring limit, which in turn is in operative connection with the switchable switch of the transport path. Furthermore, one uses a guard who is on Balances smaller than "ilull" is effective in the balancing work and that as an on switch for the auxiliary sensing element and as an off switch with the one below the reject limit on the underweight side effective feeler is connected.

After the various control values, such as mean values and outlier proportions, in a simple manner for each additional Pack are obtained, it is possible from their counter reading a receipt of the final result of the controlled series of Obtain packs by giving the balancer a recorder downstream, which records the balance after checking the entire series and, if necessary print out a receipt. This recording device becomes a computer in one case and a computer in the other can be simple printing.

When checking large production series, it is desirable to provide receipts of interim results of the To get mean value monitoring or outlier proportion monitoring. It is recommended to the recording facility assigning a trigger which can be actuated on a selectable number of packs that have passed through and e.g.

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takes care of printing out the meter readings. So that is a Proof of control of the ongoing production of packs is given. With this trigger, the Return the counter readings in the balancing works to a zero setting, which means that in this respect, too, it is fully automatic Operation of the device is taken care of.

To simplify the setting of the device according to the invention, it is advisable to make the weight interval widths of the individual weight classes proportional to the target weight jointly adjustable by pressing a button. When the target weight is set, the required weight interval is set automatically at the same time. This adjusting of the Goll weight layer should advantageously also take on even an automatic adjustment of the lower weight limit of monitoring, the adjusting drive is coupled to that for the Committee limit such that the ratio of the weight differences remains with respect to the target weight for the Urfergewichtsüberwachungsgrenze one hand and the absolute Committee border on the other constant. In this last-mentioned case, by pressing a single setting button with the selection of the target weight position, all further actuators dependent thereon are brought to their correct control value. The handling of the device according to the invention is therefore extremely simple. A tendency control can be connected to the counter readings of the balancing units, which acts on a filling machine for the packs of the series connected upstream of the device and regulates this to the desired value. For the sake of simplification, the weight interval width of the individual quality classes will also be chosen to be equal to one another. A simplification of the control should also be aimed at that the underweight monitoring limit with the transition between two adjacent quality classes of

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- ίο -

Mean value monitoring can coincide, especially if both Patrols should be carried out by the same device.

Finally, one could consider the symmetrical arrangement of the weight classes and / or give up their values with regard to the target weight and the interval widths and their values Emphasize one or more of the resulting weight classes by setting their values appropriately, e.g. if the Sensitivity of the display should be tightened in certain parts of the recorded weight range or when packs with a weight average that is somewhat asymmetrical in relation to the target weight should be output in order to be on the safe side Side "to lie with the Hess result.

In the drawings, the invention is shown schematically in one embodiment shown. Show it:

1 shows a block diagram with individual circuit means of the device according to the invention and

2 shows the clear representation of a specific application with a diagram of the obtained Result and the values set for this in the device.

The device according to the invention for automatic weight control of the actual weight of packs a, a ¹ , a ¹¹ , a ^{nl of} a series works in a continuous flow. In the weighing device b of the device, as symbolically illustrated by a piece of weight, the target weight c of the packs is set, which is set by

30983 7/0560

Weight loads on the frame of the associated scale belt d can be adjusted more precisely. From an upstream Infeed belt e the packs arrive at this Uiegesteile, a vibration-free and shock-free transition to the weighing belt is achieved.

While the pack a runs over the weighing belt d, its effective actual weight is measured via inductive switching heads with the set target weight c compared. The weighing device b is connected to a control unit f for this purpose, which is a series of setting buttons g for dividing the weight range G3 to be recorded in the tolerance field has the target weight position S on both sides. For illustrative purposes the adjustment target of buttons g is symbolic above them a scale is drawn on the device f, which is marked by each Adjustment knob g corresponding dividing line h in Kshrars weight classes is structured. By moving the buttons g weräexi die

Dividing lines h along the virtual weight; ala shifted, by

whereby the ävfi & G & en two dividing lines. ^ - truncated section " the weight scale in its interval width ■ .- changed accordingly will. In each of the cut out by two such dividing lines h Sections of the weight scale is a sensor "- / ineffective, as schematically by the dashed and by a lilammsr The dividing lines held together on the control unit £ in Fig. is illustrated. The recorded reporting area GB at the The present device is divided into seven weight classes by suitable adjustment of the eight buttons g FIG. 2 for a specific case in 7o :: larger, more precisely a Makes information that is now initially referred to

In FIG. 2, the target weight is c represents packages a, a ¹ - a. _"R a ¹¹¹ assumed to be a thousand grams of Di ^ dxnsiellunrj the iOicprre -g is selected to represent dor tick Grarxr ¹ duar fi ctiv3n.!

7/0500 original inspected

Weight scale lies exactly in the middle of the detectable weight range GB between the fourth and fifth adjustment knob g. The lower button is set to the value "995 grams" and the right button to the weight value "1005 grams". The sensor that becomes effective between these limits in control unit f responds to packs a, a ¹ , a ¹¹ , a ¹¹¹ arriving at weighing point d when their actual weight falls within this interval. This means that from the fictitious weight

, _Ί . symmetrical to the ", _. . _n 1000 skala exne f target weight S cut out from "feawaanri grams" lying target weight class SK.

The relationships with the other setting knobs g and their dividing lines h, which carry out the adjustment, are similar of class limits that are used for

the specific case of FIG. 2 is specified in more detail in the middle of the figure. In this case too, the interval width between successive limit values is set to ten grams, whereby the weight range GB is divided into seven equal cushions from its lower end with the weight value of 965 grams to its upper end with 1035 grams. ^{Outside of the weight range GB serving for the passage of w} good "packets, the control unit f has an adjoining scrap area AB, the upper limit of which is set by the setting of the first button g in the control unit, which is also the lower limit of the" good "weight range GB forms.

Shortly before the pack a leaves the weighing belt d, the result of the weight comparison with one of the aforementioned, in the various classes of the good area GB or reject area AB responsive sensors queried what should be done by a light barrier 1 at the weighing point. Provided If the package is extremely underweight, the sensor that can be addressed in the reject area Ali will send a switching pulse forward to a downstream switch j, whereby a circuit for switching a switch k is closed

30.3837 / 0560 OR'G'nal inspected

· * « Id whereby the TJeiche is brought into the dashed" Aus "-Gtellungi 'to derive the relevant pack from the transport ^{path, whereby this is sorted out from the other" good 11} packs. The diverter then goes into its full drawn effective In this effective position, the "good" packs are forwarded via the switch k to a discharge belt 1 for dispatch.

On the basis of the target weight class SK, which includes the target weight S and is located in the middle of the “good” weight range GB three overweight classes OK are arranged on the overweight side, which are consecutive for mutual differentiation marked with I, II and III, while on the underweight side In a mirror-inverted position to the target weight, three underweight classes UK are provided, which are also carried out by the designations I, II and III are differentiated from one another. As mentioned earlier, there is one in each of these classes Sensor effective, as shown schematically in Fig. 1 at the control unit f by the broken lines and grouped brackets on each of the aforementioned classes is illustrated. Those sensors are addressed in whose weight class the determined actual weight on the Tfiegestelle d straight Located pack a falls. In the drawn case of Fig. 1 it is assumed that compared to the prescribed Target weight 3, the package a is underweight, for example in the specific case of FIG. 2 an actual weight of 990 grams has, with which the pack in the first underweight class

I UK falls. The other six actual weight classes III UK,

II UK, SK, I OK, II OK and III OK effective sensors speak not on. This affects the remaining parts of the device in the following way.

As from the end of the dashed line, the effective ■ Area of each of the sensors illustrated line profile can be seen in the control device f, each of the sensors acts

309837/0560

to an output which is connected via a line ίφ to a switch Vl · which, when the sensor becomes active, is brought from its usual "off" position to the case shown for the actual weight class I UK into the active "on" position will. Each sensor and its associated switch H- connected to the line fH form a switching element for triggering a pulse generator that emits an individual number of pulses for each class. This pulse generator consists of two electrical components that come into electrical connection with each other when the respective switch η is closed, namely a pulse generator IG which emits a continuous sequence of pulses and a pulse selector p which only emits a predetermined constant number of these pulses and whose number of pulses is passed via a connected thereto Actuating button ο can be turned on.

By each of the sensors individually via its switch assigned pulse selector ρ is thus a fixed number of pulses that the pulse generator IG continuously emits, forwarded. In connection with the other components of the device, it follows that these each of the actual weight classes assigned number of pulses represents a "value" for an actual weight falling into the relevant class is characteristic. With the structure of the The device is about a weight control of the weight average value monitoring. In the specific case explained in FIG. 2, the assignment of the individual values to the classes is selected in the table shown in FIG. 2 in the upper half. The target weight or the target weight class SK that encompasses it always receives the value "zero". Both sides This class SK overweight classes OK and underweight classes UK have because of their symmetrical weight titre

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A wide range of symmetrical amounts of values, which increase proportionally depending on the weight difference of the respective classes to the target weight, "sweeping the linear division of the weight range into the individual actual weight classes, the values also increase linearly with increasing distance from the target weight position. With other divisions, the same applies In the present example of FIG. 2, the amount of the values increases with the increasing weight difference from the target weight by the fourth "1", i.e. in the order of the "natural numbers". On both sides of the target weight S or its target weight class However, the values of SK have opposite signs, namely for the underweight classes UK "minus" and the overweight classes OK "plus". In this case, the values are arranged along the recorded "Guf" weight range GB in the manner of a double beam, where d he origin at the 3ο11 weight S is located. In this way, the pulse selectors ρ assigned to the one of the actual weight classes of the recorded weight range G3 are set to the associated amount äsr valency "0.1, .2 or 3" by their operating button: ',, ^ in each 3 part ι, so that the continuing output lines rrnui i · ... 3 - ^ - r-iei-'l ^ go An ζ aiii of pulses pass through, for the more-msnan case, where the sensor of the first underweight class aa I UK .bsr- If a single pulse is activated, after actuation of the associated switch η, a single pulse leaves the associated pulse generator p, because this is set by its operating button c to read through the Ip.pulse number IZ of this an aiii, as shown in the diagram on the Iiap pulse sensor b instellwart "I" can be seen below. By knitting on the rest of the world. the other pulse selector is recognizable - oa ° there after closing the associated switch by its activated sensor, other pulses also pay IZ "2" or "3" given - yerc-an, depending on the division of the recorded Gowicht share GB

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the target weight class SK receives the impulses IZ "zero" because of the assigned value of this size. The electrical components described above would therefore be for this actual weight class is unnecessary, but they are provided in the device if a different breakdown of the Weight range GB and a different assignment of the weights should take place.

The outputs of all pulse selectors ρ are connected to a common balancing unit q. Due to the described structure of the device, it is possible to decide from the number of pulses which of the actual weight classes has been addressed, but the sign has not yet been taken into account, namely whether the number of pulses IZ is based on an overweight class OK or an underweight class UK. This distinction is important because the balancing unit q has the task of determining the value assigned to the individual, corresponding to the weighed packs, the value assigned to the individual actual class areas and continuously adding or subtracting them true to the sign The sign is simply taken into account in that the balancing unit has a "glus input" and a "minus input", where the associated output lines r and r ^{1 are} connected in accordance with the sign waiii of the valencies. The pulse selector b of the three positive weight classes OK I, II and III are connected with their output lines Jt ^x to the "plus" input of the balancing unit q, so that the number of pulses received there for the given counter status of the balance value display s added wfcrdea. According to their negative value, the underweight classes Uli I, II and III are connected to the output lines r of their pulse selector ρ with the "minus" input of the balance sheet q, whereby the incoming pulse values are deducted from the counter reading.

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In the assumed case, where an impulse of the number "1" reaches the balancing unit q via the "llinus" input via the underweight class I UK, the previously given balance value display s decreases from "plus 3 ^H to the marked fourth" plus 2 " This means that the quality of the weight of the packs whose actual weight has been checked up to then can be read off in the form of a key figure. The positive, small balance value of the counter reading s shows that the weight average value is not below the target weight S, but is slightly above it A flawless result of the checked packs is established. By means of an automatic triggering that responds to a certain number of items, a printer connected to the balancing unit q is activated and gives a printed document u about the result of the weight control of the up to then detected packs a from.

This key figure-like evaluation of the weight mean value is used all important statements have been made, even more, it is even clear how good or how bad the result is has failed and it is also said at the same time what must be done so that the mean value by adding less The pack assumes the specified target weight S again. Assuming that one thousand packages have been detected with the result of the weight control "plus 2", it follows for the true (actual mean value that for this result in the simplest case 999 packages of the prescribed target weight within the target weight class

Aoco SK with the value "NUIl", so practically "Ιμημκηκϊ grams", while a single pack fell into the second overweight class II OK with the value "* -" plus 2 ", for the middle of which the weight of 1020 grams applies if the target weight is 1000 grams in the specific

309837/0560

management example of Fig. 2 is based. This' results eggs true weight mean to 1000.02 grams for this captured packs. It can also be seen that these packs can be used without the prescribed target weight To fall below the average, take two packs of class I UK with the value "minus 1" could or only one pack of sub-weight class II UK with the value "minus 2" should be added, without falling below the prescribed target weight position of the mean value of 1000 grams. This gives you a extremely clear and very sensitive to the shift in the middleweight position due to individual packs responsive display, the simplest effort on site

".... .C -,.,. Tit .weight averages; telwer.te in terms of means required and at the same time precision up to many A distinction between decimals behind the decimal point is permitted if a group has a sufficiently large number of packs is measured. The measuring accuracy can be reduced by narrower Interval width when dividing the recorded weight range into class heights.

In the specific application of FIG. 2 there are 163 packs the target weight of 1000 grams has been checked. These packs are divided into the individual weight classes of the recorded area GB from 965 to 1035 grams with a class interval width of 10 grams in each case seven classes III UK to III OK in the manner shown in the top line of FIG. 2, where the respective Number of pieces per class is entered. These numbers are in their distribution to these classes in the one below graphic representation illustrated in a block diagram. The height of the blocks is a relative measure the number of packs determined in the associated class. In the ideal case, one expects the "Gaussian distribution",

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which is illustrated by the dashed bell curve V. In reality, the results differ considerably. This can be seen at a glance with the device according to the invention, where the assigned values, which are noted under the ropes with the classification in Fig. 2, come into play for each of the packs in the balancing unit and are continuously added up there in their order true to the sign . Most packs, namely 65 packs that fall into the target class SK with the value "zero", do not make use of the balancing mechanism, because these are already correct with regard to the target weight. This is of course due to the fact that in the present case the recorded weight range GB has been divided into an odd number of actual weight classes, the average of which corresponds to the desired target weight. However, this classification gives the invention the great advantage that the components are spared, because those packs which are "correct" with regard to the desired mean value are not recorded, because they do not have any influence on a positive o ' .er negative postponement of the final result. Thus, the j-ro.ie advantage of the invention is also in this regard _r ^ uax look ciurch assigning "VJertigkeiten" -Mwfikt. In the specific case at hand, the balancing unit receives the item ξ aiii and number of pulses for the three underweight classes UK ins-esai.rb minus 52 pulses, while 46 positive pulses are received for the overweight class O "ladij · borrowed in this specific case show the fourth "minus β", namely the difference between the above-mentioned positive pulse and ije ^ ativimpalse. or ;. ^r i23 5n. But it is immediately recognizable what has been done'Laa ^ vG _4. canit the target average weight value erriolt ^T ./ir ^ ..: '.1 "er ^ rfindane; means diea;

BAD ORKaINAL

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The counter reading of the balance display s must be at least ¹¹ nuIl ^x ". This is achieved if you add so many excess weight to this group of recorded packs that the counter reading changes from minus 6 to zero by adding the associated positive values This can be done, for example, by adding only two packs of the value "plus 3", which in terms of weight fall into the uppermost overweight class III OK, i.e. their actual weight is 1030 grams compared to the target weight of 1000 grams the invention immediately read what needs to be done to obtain the required weight average.

In Fig. 1 it is shown that the weight control of the packs can be carried out in another respect, namely with respect to a "outlier portion" monitoring. It is to be checked how many packs with a weight below an adjustable underweight limit UG are in comparison with the total number of packs of the recorded "good" weight range GB. In the specific embodiment of FIG. 2, the underweight monitoring limit UG is set to 985 grams, which corresponds to the transition value between the class division of the above-mentioned mean value monitoring between I UK and II UK; this limit could of course also be different. In any case, the lower portion of the recorded weight GB, which lies between the absolute reject limit AG (in Fig. 2,965 grams) and this underweight monitoring limit UG, is monitored by a uniform "sensor, which is shown in dashed lines in the device f of FIG Connecting lines via an associated line W ^{acts on a switch W 1} , which closes a circuit to a connected pulse selector ρ ', which receives pulses from the pulse generator IG, as described in more detail above in connection with the mean value monitoring

BATH ORIGINAL

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IA

was explained. Here, too, the pulse selector p ¹ can be set to the passage of a certain number of pulses IZ by means of an actuating button o ¹ , in the present case the number of pulses "1", which corresponds to the value of this outlier class AK between the limits AG and 1 / G of the weight range recorded GB corresponds. Since this value should have a negative sign, q ^{1 is} connected to the "minus" input of a downstream balancing unit.

In this outlier proportion monitoring, the other weight class is formed from the entire recorded weight range GB. The number of pulses corresponding to its value is emitted by a special pulse generator ν, which acts on the "plus" input of this balancing unit q '. To trigger the pulse generator ν on each pack falling in the weight range GB, a special sensor is provided, the connection of which with the weighing device d is simply that a light barrier χ in the form of a photocell and a light source is arranged behind the switch k of the weighing point d is, the "good ^ package arriving at the discharge belt 1 acts on the pulse generator ν. At the same time on the · * connecting line y between ämta the light barrier χ and the pulse generator xt

hlCSSfyü

another piece counter ζ angeyaban, the counter reading of which indicates the number St of packs a, a ¹ , a ¹¹ , a " ¹ that have passed through.

The pulse generator ν, however, has two setting buttons w, w ¹ _k with which it is predetermined how many pulses are to be delivered on how many pieces St of the packs detected by the light barrier χ. In the present case, the pulse prayer ν is set in such a way that the pulse number IZ

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¹¹ I "is delivered to a number of pieces St" 20 "of packs. In the illustrated embodiment, it is assumed / that the pack a has finally reached the light barrier χ and has thus just filled the number of 20 packs for which a pulse for Balancing unit q 'is passed on, as is illustrated by the solid pulse representation on the line behind the pulse generator ν. This pulse arrives at the "plus" input of balancing unit q ¹ and has the previous balance value in the meter reading s ¹ changed from "zero" to "plus 1". from these positive balance value display s ¹ outliers proportion monitoring shows that hair packs previously detected the prescribed permissible quantity of the packages lying below the lower weight limit UG has not been exceeded, on the contrary, it would do not matter if a pack were added whose actual weight was in the above-described scrap class AK d If the weight range lies, the balance ^{value display s 1} would still show the permissible value "NUlI".

The setting of the negative value on the pulse selector p ¹ and the positive value on the pulse generator ν, which results proportionately per pack by pressing both buttons w, w ', is based on the percentage value of the portion of the packs that is permitted below the underweight in these UG. This permissible outlier portion determines the ratio of the anidae balancing work q 'incoming pulse beams of the two devices p ¹ and v. In the assumed case, the In Flg. 2 is also specified in more detail in terms of value, the outlier proportion should only be 5%. This means the DAO Jui flaldierwerk q ¹ incoming pulse number of p ¹ hunflertprozent the ratio to 5% must therefore be equal to 20 times greater than the proportion in accordance with the pulse per package

309837/0560

encoder ν incoming number of pulses. If the pulse generator ν were to send a complete pulse to the balancing unit q ¹ for every pack detected in the recorded good area GB, the negative counter-pulse coming from the pulse generator p ¹ would accordingly have the numerical value "20". In the exemplary embodiment of FIGS. 1 and 2, however, the pulse selector p ¹ can output the pulse number "1" because the pulse generator ν only sends out a single pulse for 20 packs. The final result of the measurement is recorded in a downstream printer t ¹ in a written document u '. In this case, too, the key figure-like recording of the end result provides a clear, clear indication of the monitoring result and its correction by adding further packs. In the monitoring of the outlier proportion, the amounts of the values of the total weight range class G3-K zn of those of the reject class AK are inversely proportional to the percentage of the total packs that are permitted in d4e reject class AK. In the assumed case, this ratio is 2OsI, which is why the corresponding values are related to the amount as 1:20, namely for the reject class ΛΚ "minus 1" and for the total area class GB-K = "plus 1/20". For the numerical values of FIG. 2, too, the tear-out portion is in order. In Fig. 1, for the sake of clarity, the further possibility is not shown, according to which the switch k can also be set in its ineffective position k ¹ by VJächter, which on counter readings "less than dull" by the two balancing units q and q ¹ speak to. This switchover of the switch into its "off" position takes place only when an actual weight of the pack a is determined by a special sensing element in the control unit f, which is below the lower

BAD ORiGiNAL 309837/0560

- Λ - ■ ■. ZH

regardless of the UG limit. The "'oak k would f-.rvm. Irr ^ r in i:. :: e ineffective L η ge k ¹ , if -j as well as dan '.leroicli of the / iusschufiklasse ΛΤ \ monitored-, on the one hand responds and on the other hand the Jaoliter present in the balancing works q or fj ¹ reports a negative count whose actual weight is less than the underweight monitoring limit UG. This ensures that the end values of the monitoring are not worsened by adding further extremely underweight packs. This temporarily restricts the passage of the "good packs"; in 2 on packs with actual weights above 985 grams. Only when the meter readings of the oaldierwerke q, q ^{1 have} at least the y value "bTUll" again, the monitor located in them becomes ineffective am set, which means that the ⁷ pond k only responds to ier below the absolute reject limit AG in the manner described at the beginning.

The ^ Jeiijhe J could finally also ", which is not shown in more detail, durcii Gev / ichte fijigesoked v; erdan, the above an angonornenen overweight limit. The structure and the mode of operation then results in the already iri Susciraaenhang with the lower one Committee Fjrense AG explained in more detail.

BAD ORiOtNAL

30983 7/0560

PATENT LAWYERS

DiPL-ING. LUDEWIG · DIPL-PHYS. BUSE · DiPL-PHYS. MENTZEL

515

List; ". Er: Vj si igszeichen

α packing

C. Ic ¹ oollgov / icht rl ". '/ aage from and, r / ieges great e ra ¹ Supply ribbon JT η ' Control unit C, O ¹ T ', ins te 1 lknop f H P ¹ Dividing line, - class limitation v / ert i Ί ¹ Lieh tsciir aiike j r ¹ counter k. s' i7oak 1 t ¹ conveyor belt Ju, U ¹ management 11 counter O, 3 actuation button ■ '- ■
J- I Pulse selector '\ g Balancing work r, Outgoing line ■ ', Balance display in the counter position t, Printers receipt V Impulse generator .// Setting button X Photoelectric barrier Y management ., ; 'J tück ζ ah! Counter

BAD ORISSINAL

309837/05 SO

AB committee area

Ιύ \ Outlier class

GB Grfafter Gev / ichtbereich; "Guf 'weight range

IG pulse generator

IS Imoulsznhl

OK overweight class

ÜI \ Untergei / ichtklasnen

3K target / ev / light class

V Gaussian distribution curve

BAO ORIGINAL

309837/0860

Claims (10)

PATENT LAWYERS DiPL-ING. LUDEWIG. dipl-phys. BUSE graduate phys. MENTZEL 5b password; '' Kom ro] Iwaiigp " Claims; ■ 1 J method for weight control of a series of packs of given target weight with individual recording in actual weight classes adjustable weight interval width, characterized in that first a preselectable positive or negative value is permanently assigned to each weight class, then the associated value for each of the packs falling into a weight class of the series is determined and the determined values are continuously balanced with the correct sign, 2. Apparatus for carrying out the method according to claim 1, comprising a weighing device with a weighing range divided into weight classes, ti a by geke η η ζ eich η et, daIi connected to the weighing device (Ii), class-wise to the respective actual weight of a Pack (a) responsive sensors as triggering switching elements are connected upstream of pulse generators (p, IG; v), each of which has a number (IZ) corresponding to the preselected class-specific value (-3, -2, -i , 0, 1, 2, 3) of pulses emitting output, and let outputs (r, r ¹ ) of the pulse generators are connected to a common balancing unit (o, q ¹ ), which is a true to the original, according to the relevant value, positive ^{mini pulses (r 1} ) adding and neeativimjm] se (r) subtracting BATH ORIGINAL 309837 / üSoü Balance value display (s, s *). 3. Device according to claim 2, characterized in that for the mean value monitoring of the actual weight of the packs (a, a ¹ , a ¹¹ , a "') the detected weight range (GB) of the weighing device (b) is symmetrical to the adjustable target weight (s; c) is classified both with regard to the weight interval width and with regard to the amounts (3 _f 2, 1, O) of the weights and the weight classes (OK, OK; I, II, III) on both sides of the target weight (s) weights with opposite signs (+; -), the value of the value (3, 2, l) of the individual weight classes increasing proportionally depending on the weight difference to the target weight (s). 4. Apparatus according to claim 2 or 3, characterized in that for proportion monitoring of the packs (a, a ¹ , a ^lf , a ¹¹¹ ) occurring below an adjustable underweight limit, the total weight range (0B) of the weighing device has a weight class (GB-k) with positive value for pulse control (v) of an associated balancing unit (q ¹ ) and as a further weight class (AK) with negative value for counter-pulse control (p ¹ ) this balancing unit (q ¹ ) forms the one below the underweight monitoring limit (AG) includes the portion of the weight range (GB), whereby the proportional ratio of impulse (v) and counter impulse (p ¹ ) resulting per pack (a) is equal to the percentage value of what is permitted below the underweight limit (UG) lying portion of the packs (a) (outlier portion). BATH ORIGINAL 309837/0580 JiS 5. Device according to one or more of claims 2 to k _t, characterized by a reject limit (AG) that closes the classified weight range (GB) on the underweight side and / or overweight side and a sensing element responsive to the actual weights of the packs beyond (AB) the reject limit (AG), which is connected to a switch (k) which can be switched to the "off" position (k ¹ ) and which - viewed in the feed direction of a transport path (e, l) of the packs (a, a ¹ , a ¹¹ ) controlled by weight in the passage - behind the Cradle (d) is arranged. 6. Apparatus according to claim 5, characterized by means responsive to Istgewichte below the Untergewichtsüberwaehungsgrenze (UG) auxiliary Fühlglled, which in turn (k) to the switchable W _e cozy the transport path (e, 1) is in operative connection, and by counter readings ( sj s ¹ ) less than "zero" in the balancing unit (q; q ^f ) of the mean value and / or outlier portion monitoring effective monitor, which is connected to the auxiliary sensing element as an on switch. 7. Device according to one or more of claims 2 to 6, characterized in that the balancing unit (q; q ^f ) of the mean value and / or outlier ^{portion monitoring has a recording device (t; t 1} ) for recording and / or for documentary printing (u , u ') the meter readings are connected downstream. 8. The device according to claim 7 »characterized in that the recording device (t; t ¹ ) a by a selectable number (z) of passed through" good "packs (a) actuatable trigger for the recording 309837 / Ü560 and / or for printing (u; u ¹ ) the counter readings (s; s ¹ ) is assigned, which is also associated with a return of the counter readings (s; s ¹ ) to zero in the balancing works (q; q ¹ ), 9. Device according to one or more of claims 1 to 8, characterized in that the weight interval widths of the individual weight classes (UK ₁ OK; I, II, III) are jointly adjustable in proportion to the target weight (s). 10. The device according to one or more of claims 2 to 9 »characterized in that the actuating element for setting the target weight (s) at the same time assumes a dependent, automatic adjustment of the underweight monitoring limit (UG), the adjustment drive of which with that for the reject limit ( AG) is coupled in a «specified gear ratio. 3 0 3837/0560 Blank page