DE1285194B - Price calculation scales - Google Patents

Description

1 2

The invention relates to an automatic, electrical weight values serving photocells in addition to Price calculation scales with a photocell readout in relation to the weight reading Scannable, load-dependent deflectable code disk, redundant information used through which the which is limited by the weight values of the scales tensile weighing range.

ordered binary code elements in addition to another 5 In a further embodiment of the invention are two Code elements (control code elements) for actuating additional photocells reading out the weight values a lock when exceeding or falling below a balance load below a specified Has weighing range. Response threshold can be switched at the same time.

It is such a price calculation balance. In a price calculation balance according to the invention

knows, in which the code elements of the code disk inside io with code elements arranged on a gap in two half of the normal weighing range in the form of a tight column, the information of which, packed by a relay control, binary reflected codes in seven column circuit controlled, can be entered in memory relays, are arranged so that 128 distinguishable and a motion detector is still pre-weight levels read off. In addition, one can see that the two go through at least one column Column with two further columns of the lowest weight decade separated from the normal 15 Weighing range lying code elements provided, assigned memory relay by the relay die corresponding to an additional, eighth photo control circuit, a delay cell that can be switched in parallel at times are scanned. The eighth column with its guard elements are connected as a motion detector, both to limit the weighing range Code elements come from the information display of the scales used individual code content from one "bit" to, because these two elements are in a known manner in two Code elements can only be determined whether the load columns are arranged on a gap in such a way that a swing is outside the normal weighing range or the scales with a predetermined, maximum permissible not. Overall, with this device, amplitude around any boundary between two becomes unique 129 bits are created while the switching status is set with the 25 individual code elements of a column As is well known, eight columns with code elements used the photocell connected to the other column 256 bits could represent. This disadvantage is not influenced, so that the rest position of the balance on it, that one is shown the number of to be transmitted.

Weight values only optimally based on the first seven. It goes without saying that both the design of the

Has matched code columns so that for the purpose of 30 invention in the form of a response threshold as well the weighing range limitation was forced to not activate one of a standstill or motion detector additional column with code elements and one from the above-mentioned formation of an upper one tentative photocell, which devices are bound to the weighing range limitation, but not disadvantageous can not be provided at the same time nor to others depending on it. if Purposes can be exploited. 35, however, the price calculation scale according to the invention

The invention is therefore based on the task of providing both an upper weighing range limit and a To create price calculation scales, the weight of which has a photoelectric motion detector, reading device is constructed in such a way that the photocells provided by the motion detector Code columns that can be generated binary informa- tively are preceded by the exceeding can be better exploited than has previously been the case. Determine 40 of the range limits. That way will This object is achieved in that, according to the invention, it monitors whether the normal weighing range is only up-to-date the number of those that can be represented with the code elements in the course of a transient process, binary information is greater than that to be exceeded or fallen short of, and only then becomes a The key number of weight values is actuated by the locking device when the weighing pan did give way the redundant information as control has come to rest and is in this code elements can be used. Rest position outside the normal weighing range

The invention is therefore based on the idea that limit is located.

that it is practically impossible to use the decimal

Number of weight levels to be coded redundancies explained in more detail using an exemplary embodiment, freely the number of with the specified code 50 It represents

columns of representable binary information. 1 schematically a photoelectric weight pass, d. h. that over the encryption of the readout device of a price calculation scale, Weight values required number of information- F i g. 2 shows a partial view of a code disk,

In addition, redundant information is formed F i g. 3 and 4 together become the photocell and relay, So to which no weight values are assigned 55 circles for each of the columns of binary markings are. Such redundant information is transferred to the code card,

also understood as code elements and for control F i g. 5 the circuit diagram of a control circuit,

functions used. In this way, they make a price calculation scales, which in well-known

Control code formed redundant information from a weighing device, a post element the known computing device arranged in isolated code columns and one of these arranged control code elements and their train-controlled printing unit is a code disk 36 circuitry unnecessary. connected to a weighing lever 35. The code

The embodiment of the invention consists of two photocells reading out the weight plate when the lamp 40 is exceeded and a converging lens 41 is illuminated by a fixed projection value reading, where the weighing range at the same time through the image that is assigned to them on the code disk 36 th code elements deviating from their light-dark markings contained in the weighing with a switching state occurring in the range. Thus projection lens 42 on a photocell mask 45 become that is, which is used to encrypt the regular one from which it reaches the photocells 50.

Each of the photocells 50 is located immediately behind a slot 55 in the mask 45, so that laterally incident Stray light is largely suppressed. The photocells 50 reduce their electrical resistance, when light hits the photocell window. Each of the photocells is one of the fourteen Associated with columns 37 with code markings which are provided on the code card 36.

An enlarged section of the code disk 36 is shown in FIG. 2 shown. This illustration shows that it is a special, reflected binary code, in which a vertical deflection by one weight unit only changes one light-dark marking of a line.

While the maximum weighing capacity of the weighing device is 24.99 pounds, the code disk with its fourteen columns of weight unit levels is able to encode 2999 distinguishable weight unit levels, so that a maximum weight of 29.99 pounds is binary encoded in steps of 0.01 pounds could. For this purpose, the code disk has three groups of four columns of binary markings, groups A to D being assigned the hundredths of pounds, groups E to H being assigned to tenths of a pound and group / to L being assigned to the pounds of the weight on the scale platform. In contrast, only two columns JV, M of binary markings are required to code the tens of pounds, since with a maximum weight of 25 pounds the digit value of the highest column can only be 0.1 or 2.

The code is formed on the code disk in accordance with Table I below, the corresponding decimal digits being arranged in the unmarked column. The numbers »0« and »1« in the columns characterize the switching status of the photocells. This designation is of course arbitrary, the code elements shown in black causing the switching state "1" in the exemplary embodiment shown. Table II summarizes again which of the photocells F _a to Fa is in the switching state "1" with a decimal digit between 0 and 9.

45

Table I. 1 L. K J / Biquinary number 0 F. E. D. C. B. / i Binary cyclic T-H 0 0 0 T-H HG 0 0 1 0 0 0 1 NM 1 0 0 0 1 0 0 0 1 0 0 T-H 1 O 0 1 0 0 0 1 0 0 0 1 0 0 T-H 0 T-H 0 1 0 0 0 T-H 0 0 0 1 0 1 1 0 2 0 1 0 0 0 1 0 0 0 1 0 1 0 0 3 0 1 0 0 0 1 0 0 0 1 1 1 0 0 4th 0 1 0 0 0 1 0 0 0 1 1 1 1 0 5 0 1 0 0 0 1 0 0 0 1 1 0 T-H 0 6th 0 1 0 0 0 1 0 0 0 1 1 0 T-H 1 7th 0 1 0 0 0 1 0 0 0 1 1 0 0 T-H 8th 0 1 0 0 0 1 0 0 1 T-H 1 0 0 1 9 0 1 0 0 0 1 0 0 1 1 1 0 1 T-H 10 0 1 0 0 0 1 0 0 1 1 1 0 T-H 0 11 0 1 0 0 0 1 0 0 1 T-H 1 1 1 0 12th 0 1 0 0 0 1 0 0 1 1 1 1 0 0 13th 0 1 0 0 0 1 0 0 1 1 0 1 0 0 14th 0 1 0 0 0 1 0 0 T-H 1 0 1 1 0 15th 0 T-H 0 0 0 1 0 0 1 1 0 0 1 0 16 0 1 0 0 0 1 0 0 1 T-H 0 0 1 1 17th 0 1 0 0 0 1 0 0 1 1 0 0 0 1 18th 0 0 0 0 1 0 1 0 0 0 0 1 19th 0 0 20th 0

55

60

Table II

0 = company

1 = Fa, Fb

2 = color

3 = Fb, F _c

4 = F ₀

5 = Fc, Fa

6 = F ₆ , F ₀ , Fd

7 = F &, Fa

ο - Fa, Fb, Fa
9 = Fa, Fa

From Fig. 2 it can also be seen that, although the individual decimal digits correspond to predetermined binary arrangements (information), conversely, no decimal digits are assigned to predetermined arrangements of binary features within the weighing range from 0 to 25 pounds; in other words, the code used thus has a predetermined redundancy. This is partly due to the structure of the code used and partly due to the fact that it is usually not possible to match the decimal weight information with the number of distinguishable arrangements of binary features increasing with the number of columns according to powers of two. For example, one recognizes from FIG. 2 that there is no decimal value within the weighing range of 0 to 25 pounds for which both the photocell assigned to column A and the photocell assigned to column C are illuminated at the same time.

It is also important that columns E and G extend upwards and downwards beyond the specified weighing range, ie that both columns have a marking below 0 and above the maximum weight limit of 25 pounds at the same time. Accordingly, the photocells F _e and Fg assigned to these columns will only be simultaneously in switching state "1" outside the normal weighing range.

Finally, for the definition of the response threshold of the balance, which is still to be described, it is important that the dark area in column M ends below 0.11 pounds.

The circuits required for weight reading are shown in FIGS. 3 to 5 shown. The photocells 50 are designated in detail with F _a , Fb, F _c etc. in accordance with the column A, B or C to which they are assigned. In the same way, the relays controlled by the photocells are marked with R _a , Rb, Rc etc.

All photocells 50 are connected to a common power supply line 80, which can be connected to a negative, unscreened direct voltage (half-wave voltage) of about -300 volts either via a normally open contact PI or a normally closed contact QI of the control relays R _p or R _q. The photocells are all similarly connected to a common return line 81 via series resistors 82. If one of the photocells Fa to F _{n is} illuminated in the equilibrium position of the balance, the resistance of the photocell drops in the order of magnitude of 5: 1, so that at the connection point 84 between the photocell 50 and the series resistor 82 a more negative potential with respect to the line 81 is created.

5 6

To operate the relays R _a to R _n , Thy can be activated, so this indicates that one of the Response Rontron tubes are provided, the grid of which is on the scales due to the load falling below the threshold, and the photocells are controlled, preferably the relay Rp is not actuated, but four-layer diodes 85 are used, which are labeled V _a to V _n with the according to FIG. 2 arranged code elements are designated, corresponding to the above designation 5, it is also possible to move the scales or voltages. These four-layer diodes are like thyratrons to determine their standstill.

insofar as a negative pulse at the base of Fig. 2 shows that the code

Diodes makes these conductive, in which state they are elements of columns A and C always on gap, remain until the voltage is removed from the anode. The motion monitoring circuit is used. io part of the photocell scanning circuit of relays R _a and R ₀

According to FIG. 3 and 4 are the four-layer diodes 85 during the balance movement and has a circle in series with the associated relays R _a to R _n between the dropping of either the relay R _a or the seeing of a line 86 and the common line relay R _c responds to signal that the load 81 switched. An unfiltered DC voltage has come to rest. Since thus the code actuation of the relays R _a to R _n is the line 86 15 elements of the two columns in no equilibrium supplied; it is in the order of magnitude of 24 volts, position the scales occur simultaneously, or with each four-layer diode 85 is with its cathode once different words, since the two of the columns zugeordan the associated connection point 84 and to the neten relay R _a and R ₀ at standstill of the other scales cannot be operated simultaneously via a diode 88 with the line 81., can be connected by the. ao arrangement of the relays R _p and R _{r assigned} to them

The diodes 88 have contacts for the four-layer diodes 85, through which the relays R _a and R _c, due to their polarity, have a small through capacitors for drop-out delay in parallel, while they are bar for the photocells, a motion detector for the balance on the reverse Polarity build a high resistance. The motion detector speaks how to continue to educate and thus not to attenuate their signal. Additional 25 will be explained in more detail below, on the falling borrowed each of the relays R _a to R _{n is} a resistor 89 one of the relays R _a or R _c on, which means that the connected in parallel. The purpose of resistors 89 is Libra has come to rest. If namely, how from the immediate supply of a current to the four- F i g. 2 it can be seen, after the delayed cut-off diodes V _a to V _n , in order to keep them conductive _, if a relay R a or R _c does not fall again while the current in the associated relay 30 is speaking, this means that the The scales are only building up at most. within or on the border of a code

The circuit components of column A or C described above oscillate, ie that the parts in each of the circles for scanning the scales have essentially come to a standstill, as they are provided in columns A to N. these columns, as stated above, only those

It also indicates that the 35 hundredths of a pound above are being read. This length of the already mentioned response threshold of the scale, which code elements thus causes the movement according to the embodiment to be 0.1 pounds, the detector does not respond to small vibrations that should be reached when the scale is loaded, because the photocells F _a and F ₀ and, in contrast to the known weighing devices, also relays R _a and R ₀ within a code case the code disk 36 is used. 4 ° element remain in the same switching state.

According to the above, in the ten pound column M With the above-described configuration of the code

and N are the binary features so arranged that, at disk, the weight reading takes place following a load of 0 to 9 pounds in column M :

Code element occurs while under a load of When the scale is without a load on the load pan

10 to 19 pounds in both column M and where 45 is in equilibrium, relays 308, R ₀ , column ./V are a code element. At a load Rp, Rg and R _r and all relays R _a to R _n load is equal to or greater than 20 pounds then only fall in; the same also applies to the column N, which is not shown, has a code element. In order now to relays with their contacts 309-1 to 309-3, 316-1, achieve that with the load 0 those of the column M to 347-1 and 613-1. So that the signal lamp 232 does not respond to the ordered photocell, the code 5 ° is on the closed normally closed contacts M-2, N-2 and element in column M by a predetermined length β-3. When a load is shortened to the load shell, as shown in FIG. 2 can be seen. The code is brought, so the code disk 36 begins to move element in the column M thus only begins at about, which triggers the photocell F _a . 0.1 pounds on, so that of the M and JV columns at these switches their associated four-layer diode V _a , so a load below 0.1 pounds none of the pulls that the relay R _a responds and photocells prescribed in this position is operated. remains because the currents of the photocell F _{a are} not diverted any- As a result, the column M only comes above the how. These currents keep the four-minimum weight of one tenth of a pound to the film diode in the conductive state above zero effect. If the response threshold potential is exceeded by a two-way rectification, this is indicated either by a DC voltage generated by column M or by 60, which is fed to the diode in column N. The tax will. Immediately thereafter, the relay R _{0 is} encircled for this purpose according to FIG. 5 activates the start relay R _v and in a similar way through the memory radio and the normally open contacts MI and NI of the relay R _m tion of the four-layer diode V ₀ assigned to it and R _n , which are connected in parallel to each other, so that hold.

Each of these contacts the relay Rp via a rest 65 Since the two successively responding relays R _a contact Q-3 of the main _{relay R s} and a rest contact and R ₀ according to the above remain in this state, clock Ol of a repetition preventing R ₀ be - the working contacts AI and CI can operate at the same time. If none of the relays R _m and R _{n are} resolved, the relay R _r picks up. When the load

Exceeds 0.1 pounds, when the inductive current of the relay R _p responds through the diode 150 to relays Ra and Rc , one or both of the relays R _{m will also} flow back, the relay R _p drops out and interrupts the and R _n , as their photocells operate then yes also power supply to the line 80 to the photocells are acted upon. With the response of the relay R _p opens its Arlais R _m or R _n their working contacts MI 5 beitskontakt P-2, which closes the relays R _a and or NI , whereby the relay R _p picks up. R _c parallel switchable time delay elements are switched off at the same time by opening the idle switch and the associated four -shift clocks M-2 or iV-2, the signal lamp 232 goes out. The diodes V _a and V _c remain conductive after ignition, the Rp switches with its normally open contact P-2. This makes the arrangement insensitive to relays R _a and R ₀ via the already closed working io via any further movement of the balance; according to the contacts RI and R-2 of the relay R _r a J? C arrangement- the position of the code disk 36 has become conductive, consisting of the resistors 132 and 133 four-layer diodes remain even after the removal of the capacitors 130 and 131, parallel. Power supply to the photocells in this conductive

Once the scales are in their equilibrium state. When the four-layer diodes become conductive, the photocells F _a and F ₀ are actuated alternately by the 15 during the short period of the simultaneous code elements of the code disk 36 in ever slower actuation of the relays R _p and R _a. When the mechanical locking of the balance in the equilibrium position has almost been reached, one of the equilibrium positions is no longer required, photocells F _a and F ₀ or both photocells without the described interruption of the power supply. By connecting the ÜC arrangement in parallel to the photocells in conjunction with the connection to the relays R _a and R ₀ , their inductive self-locking effect of the currents that have become conductive, which means that the four-layer diodes are extinguished, practically means an electrodiode during the Becoming zero of the unshifted niche locking, which prevents the scanning DC voltage is prevented, compensated so that the device responds to further movements of the balance, the relays R _a and R _c remain attracted. This means that the relays R _a and R _c, which are initially not de-energized, have been terminated before the entire disengagement process has been completed in the manner described below.
which is fully controlled by the associated photocells F _a and F _c by closing the break contact P-5, because the four-layer diodes are grounded at zero crossing a computer start-up line 151, so that the half-wave voltage block. The relay 308 closes and thus the disengagement process blocking a four-layer diode, the associated 30 of the computer is triggered, provided that the relays R _a and R _c only until the break contacts 309-1, 613-1 and the normally open contact expire delay QS specified by the JRC arrangement are closed. Hold your own time at the beginning of the calculation process. the relays close their contacts 309-2 and 316-1.

If one of the relays Ra or R _c drops out, the relay R _{0 is} actuated, which now also holds the relay R _r after a very short time delay via its normally open contact O-3; In addition, there is a delay during which its induction current will flow back through the diode 135 through the lamp 232 via the normally open contact O ~ 2. This also switches, which indicates that one of the normally open contacts RI and R-2 is now open, with the result that the new load can be applied to the scale. .RC-arrangement of the relays R _a and R _c switched off. By opening the normally closed contact 309-1 is dropped. This can drop out immediately, if not 40 also the relay 308 off. At the end of the readout, its associated photocell switches on the relay. The process becomes a normally closed contact 347-1 of a relay. When the relay R _r drops out, its idle computer is opened, causing the relay R _{g to} drop out. D contacts R-3 and R-4 are closed, which means that the starting position is the starting position, which at the beginning, before lais Ra and R _c, the diodes 136 and 137 are switched in parallel according to the application of a load according to the beginning. Thus, the relays R _a and R ₀ 45 of the description with regard to the mode of operation were available, continue to be reached only by those assigned to them again with the only exception that controlled by photocells, since the inductive currents of the energizing of the relay R ₀ its normally closed contact Ol ge -Relay coils are compensated again. is open, which prevents reading out again

When the relay R _r drops out, its idle state closes, because the open idle contact Ol leaves the contact RS, which means that the closed working relay R _p no longer picks up,
contact P-4 the relay R _{q is} energized, which as soon as the signal lamp 232 is switched on, holds itself via its normally open contact Q-6. So that the load on the scales is changed, the make contact QS is also closed, which relays R _a and R ₀ in the above-described one of the preconditions for the start of the computing manner, whereby the relay R _r via the generators is; In addition, the normally closed contact QA will also attract closed normally open contacts AI and CI, which means that the diodes 140 can be connected in parallel, which in turn causes the relay R _{0 to} drop out and 141 to form the relays R _m and R _n . calls. When the balance reaches a new equilibrium - so that the four-layer diodes V _m and V _n remain conductive in the weight range above 0.10 pounds of their ignition, as above with regard to the Di-, a new scanning process takes place, which in the dreary Va and Vt was executed. At the same time, the closing of the normally open contact ß-2 causes the relays R _r and R _P to close, provided that power is supplied to the relays Rb and Ra via which the arithmetic operation for the previous load has been terminated 86, whereby the opening of the rest contact and the price card has been removed, clocks QI a power supply for the line 80, which is interrupted by the closing of the rest contacts 309-1 and. 65 613-1 is displayed. On the other hand, if the scale im

By opening the normally closed contact Q-3 , the zero point has come to rest, there is no

Power supply to the relay R _p interrupted, and after the second operation, because there is none of the relays R _m and

a very short period of time during which the In- R _{n is} switched on, the relay R _{p is} not switched on

809 647/1835

can be switched. In this case, the signal lamp 232 is then switched on via the normally closed contacts Q-3, N-2 and MI .

Finally, the code disk can also be used to indicate that the load is below zero - due to incorrect tare setting - or above the specified weighing limit. As shown in FIG. 2 and Table I, the code elements never appear simultaneously in columns E and G within the weighing range and the response range, ie from 0 to 25 pounds. Thus, by adding code elements in these columns beyond the limits mentioned, the code elements appear simultaneously in columns E and G above and below these limits. According to FIG. 2, a weight of -0.01 causes the photocells in columns A, E, G, I to respond. A weight of 25.01 pounds causes the photocells in columns! ,, K, G, E, A to respond. It can be seen that in both cases the photocells F _e and Fg are switched on together. This switching state can be used to indicate an error and to prevent automatic work. A circuit for further processing this fact can be implemented in terms of equipment in a manner not shown in that an error detection relay can be actuated via the series connection of one normally open contact of the relays R _e and R _g , which always happens when both relays are switched on.

By actuating the error detection relay, the calculation process is prevented from running.

Claims (4)

Patent claims: 1. Automatic, electrical price calculation scales with a load-dependent sensor that can be scanned by photocells deflectable code disk, which is assigned to the weight values of the scales binary code elements in addition to further code elements (control code elements) for actuation has a lock when exceeding or falling below the weighing range, characterized in that that the number of binary information items that can be represented with the code elements is greater than the number of weight values to be encoded is, of which the redundant information can be used as control code elements are. 2. Automatic, electric price-calculating scale according to claim 1, characterized in that two photocells (F _e , Fg) reading the weight values when the weighing range is exceeded can be switched simultaneously by the code elements assigned to them deviating from their switching state occurring in the weighing range. 3. Automatic, electric price calculation scale according to claim 1 and 2, characterized in that two further photocells (F _m , F _n ) reading the weight values can be switched simultaneously when the scale load is below a predetermined response threshold. 4. Automatic, electrical price calculation scale according to claim 1 with gap-arranged code elements in two columns, the information of which, controlled by a relay control circuit, can be entered in memory relays, and with a motion detector, characterized in that the two columns separated by at least one column (A, C) of the lowest weight decade associated storage relays (R _a , Rc) are connected as a motion detector by the relay control circuit (R _p , R _r ) temporarily switchable in parallel delay elements (130, 132; 131, 133). For this purpose 2 sheets of drawings