DE2842951A1 - METHOD AND DEVICE FOR COUNTING BY STEP-BY-STEP ELECTROMAGNETIC ROTATION OF NUMBERS - Google Patents

Description

The invention relates generally to rotatable electromagnetic display systems of the type disclosed in U.S. application Serial No. 706 129, which issued on July 16, 1976 by D.W. Fleischer was submitted and "Rotary Electromagnetic Indicator System ". More particularly, the invention relates to a new and improved display system which very well used for fuel dispensers to measure the amount and / or price of the amount of fuel dispensed to display.

909815/0909

-Al '

A primary object of the invention is to provide a new and improved electromagnetic rotation indicator system for fuel dispensers that works better and is more reliable is when displaying the amount and / or price of the amount of fuel dispensed.

Another object of the invention is to provide a new and improved, relatively inexpensive one and fast electromagnetic rotating decade display.

The invention aims at a counting and display system of the type in which one or more display wheels are used, a new and improved electromagnetic indexing system which can be actuated to electromagnetically rotate each indicator wheel.

The invention aims at a counting and display system of the type having an electronic storage register for storage a count and one or more displays for displaying the stored count, a new and improved one V-switching system created to rotate any rotary display to register the corresponding stored digital count of the electronic storage register.

The invention is intended to be used in an electromagnetic rotary display system of the type described a new and improved

90981 5/0909

tes system for monitoring the rotation of the number wheel was created to check that the dial is turned correctly and to check that the display is operating incorrectly Report to.

The invention is intended to provide a new and improved electromagnetic Rotary display system can be created, which is characterized by uniform and reliable operation via a wide range of operating temperatures and voltages, and a lower average for its operation Performance needed.

The invention aims to provide a new and improved reset system for an electromagnetic rotary decade display for resetting the decade display to "0" or another predetermined one Provision position can be created.

Furthermore, the invention is intended to provide a new and improved electromagnetic rotary display with a permanent magnetic Display rotor and a stator with a stator core with an annular arrangement of a plurality of protruding Poles can be created wherein a drive coil can be selectively energized to make the rotation indicator magnetic move further, and wherein a detection coil is provided to monitor and determine the rotation of the display and to de-energize the drive coil at the right moment.

909815/0909 - 3 -

Λ *

The invention is intended to provide a new and improved electromagnetic Rotation display system can be created that operates at a relatively high indexing speed can be.

The invention is also intended to provide a new and improved method of operation for an electromagnetic rotary display be created to rotate a display wheel from a display position to a subsequent display position exactly and to reduce or eliminate overshoot and / or undershoot of the wheel when turning.

The invention is also intended to provide a new and improved electromagnetic counting system with a rotary indicator for moving further a wheel of a rotating counter.

The invention also seeks to provide a new and improved module with a single rotatable indicator wheel used alone or together with others in a row as a numeric display or the like can.

The solution according to the invention consists in a method for counting by step-by-step electromagnetic rotation of a Number wheel in one direction of rotation to a number of consecutive display digits arranged at the same angular distance

909815/0909
- 4 -

lungs in that the electromagnetic dial is energized in an angular direction from one to the next display position is that the speed of rotation of the number wheel at least when braking to the next display position electromagnetically is detected, and that the electromagnetic number wheel is de-energized when the detected speed falls below a specified value.

Further solutions according to the invention and advantageous embodiments result from the subclaims.

The invention is described below, for example, on the basis of advantageous embodiments with reference to the attached Drawings described. Show it:

1 shows a combined schematic representation and representation of the mode of operation (partially broken away) of a fuel dispenser, in which an embodiment of the electromagnetic rotary display according to the invention is used;

FIGS. 2A to 2C, associated parts of a schematic representation and representation of the mode of operation (partially broken away) Fig. 13 showing a circuit for actuating the display of the display system;

Fig. 3 is an enlarged side view (partially broken away and partially in cross section) of a rotary display module

909815/0909
- 5 -

the display system; and

4 is an enlarged front view in cross section of the display module (partly broken away and partly in cross section) .

In the drawings, the same parts are provided with the same reference numbers.

In the drawings, a fuel pump 10 is with Price register 14 and quantity register 16 constructed in accordance with the invention are shown. The pump has a nozzle 18 for Dispensing fuel and suitable means 20 for receiving the nozzle around the nozzle 18 between different dispensing operations to keep from fuel. Conventionally, a meter 22 has been housed in a fuel line which leads to the nozzle 18 is a rotatable output shaft 24 which corresponds to the amount of fuel dispensed is rotated. The shaft 24 of the measuring device is connected so that it drives a suitable pulse generator 26, to generate a series of electrical volume pulses, for each predetermined volume subset of dispensed Fuel a pulse is delivered. In the embodiment shown, 800 pulses per gallon (approximately 3 »785 liters) submitted. The price for the volume unit is based on the gallon. The pulse generator 26 can, for example, be an angular pulse generator

909815/0909
- 6 -

gate. be of the type disclosed in U.S. Patent 3,786,272 to John G. Gamble et al. dated Jan. 15, 1974, entitled "Hall Effect Rotary Pulse Generator "is described.

In order to understand the operation of the electromagnetic rotary indicator system of the invention, a flowchart is provided a circuit for operating the display and is described below. Preferably the operating circuit created by a suitable microprocessor.

A register reset circuit 30 (described below) is selectively operated by a control switch 34 operated by a handle 36 to view the price and volume registers 14 and 16 to be reset immediately before each dispensing of fuel. The register control lever 36 is in placed near the device 20 for receiving the nozzle and formed so that the handle 36 in its vertical or the "off" position must be turned to open the control switch 34 so that the nozzle 18 is in its storage opening can be brought after the end of the fuel delivery. the Nozzle 18 must be removed from storage opening 20 in order for handle 36 to be in its horizontal or "on" position can be rotated to close switch 34. The rotation of the handle 36 to its vertical or "off" position leads to the fact that a switch 40 (FIG. 2B) for the motor control is reset to a drive motor 42 to de-energize for a feed pump 44. A twist of the hand

909815/0909
- 7 -

At

handle 36 in its horizontal or "On ^H position actuates the reset circuit 30, so that the price and volume registers 14 and 16 are reset to zero and that the switch 40 for the motor control to re-energize the motor 42 is set, whereby the dispenser is enabled to dispense fuel.

Each of the registers 14 and 16 has a series of five rotary displays or decade modules 58 of increasing significance with corresponding number wheels 60. A display actuation circuit 64 (described below) is operable to accumulate counts of the volume of fuel and the price of fuel that has been dispensed and to rotate the series of volume displays 58 to register the accumulated volume count and that the series of price indicators 58 are rotated to register the accumulated price count. In addition, the reset circuit will be described below, the circuit 64 30 is provided for driving the display with which the volume and price display wheels "can be reset, when the handle 36 in its horizontal or" on ¹¹ O 60 on "- Position is rotated just before the delivery of fuel is started.

The circuit 64 for operating the display has an addressable BCD volume counter 80 (volume counter for binary coded Decimal digits) with five separate BCD memory de-

909815/0909

in increasing importance for the five volume displays 58 on. The volume pulse generator 26 is connected to the BCD volume counter via an input counter section 79 which divides by eight 80 connected so that the BCD volume counter 80 accumulates the values of the volume of fuel dispensed to two decimal places. The BCD addressable volume counter 80 and input counter section 79 are connected to reset circuit 30 so that it is reset between fluid dispenses can be. During the subsequent dispensing of fuel, the BCD volume counter 80 is incremented to to accumulate the volume of the fuel dispensed, it being understood that the input counter portion 79 a count or a transmission pulse for indexing the volume counter 80 for every eighth pulse from the pulse generator 26 and thus gives off for every hundredth of a gallon of fuel dispensed. The pulse generator 26 is described in the Embodiment not reset when registers 14 and 16 are reset. However, it could if so desired, additional suitable means can be provided to reset the pulse generator 26. Preferably therefore, the input counter section 79 is reset to a state in which it counts four. Also will ensured that each hundredth of a gallon pulse passed to the BCD volume counter 80 is timed so falls that it occurs about midway through the delivery of the corresponding hundredth of a gallon of fuel .

9Ö9S1S / Ö909

A suitable generator 68 for price pulses and a through ten dividing input counter sections 70 are provided to generate a series of 1 cent pulses or hundredths cost pulses to a five-decade BCD price counter 84, which is similar is constructed like the volume counter 80. The price pulse generator 68 is equipped with a suitable price selector 72 and with connected to the volume pulse generator 26 to generate an appropriate series of thousandths of a pulse (each representing $ 0.001) for each To deliver volume pulse, in such a way that the addressable BCD price counter 84 exactly the price of the delivered Of fuel is accumulated to the nearest integer value of one cent. The input price counter section 70 is preferred reset to the number five when the collective circuit is reset for the price, and is also preferably switched so that every hundredth pulse or every 1-cent price pulse that is passed on to the BCD price counter 84 is sent out roughly in the middle of the delivery of the amount of fuel that is one hundredth of the price or the price of 1 cent.

Reference should now be made to FIGS. 3 and 4.

Each rotatable number wheel 60 can selectively electromagnetically move to any of its ten counting positions "0" through "9" which are different from one another have the same angular distances, are switched step by step. For this purpose, the rotating decade module comprises 58 a stator 88 having a generally flat stator core 89 with an outer circular ring 90 and seven radially

909815/0909

- 10 -

inwardly extending projecting poles 91 to 97, which are angularly spaced from one another, with a "primary" Winding assembly or coil 98 (or coil 98 for the salient drive pole) on salient pole 95 and with a feedback turn or coil 99 (or coil for the salient receive pole) on the salient pole The stator core 89 (which can for example consist of flat sheets of soft iron) is fixed on a frame 100, and it is a suitable electrical connector 102 on a rear Flange 104 of frame 100 is provided for electrical connection to the four leads of the two stator coils 98 and 99 to manufacture.

The rotatable decade module 58 has a rotor 108 a centrally arranged permanent magnetic hub assembly 110 with a support hub 111 made of plastic, which is rotatable is mounted on a pivot shaft 112 attached to the frame is anchored. The number wheel 60 of the rotor 108 is made of thin plastic material with an outer one, the numbers 0 to bearing ring 116 surrounding the stator ring 90, and from a Intermediate web 118 connected to fasteners 120 on an outer end surface 122 of a generally circular end flange 123 of the support hub 111 is attached.

Two identical, axially spaced and oppositely directed coaxial pole pieces 127 are on the Support hub 111 made of plastic attached. Each of the pole pieces

909815/0909

- 11 -

has five axially extending segments or poles 128 that are equally angularly spaced (i.e., angularly spaced 72 degrees), each of which has a pole face that is 18 ° wide. The two pole pieces 127 are attached to the support hub 111, to obtain an annular arrangement of ten poles 128 equiangularly spaced. A circular one in the axial direction magnetized permanent magnet 130 is mounted coaxially between the pole pieces 127 and in contact with the same so that the five poles 128 of each pole piece 127 have the same polarity and that the ten poles of the annular pole arrangement alternate Have polarity. The support hub 111 has ten slots 132, 133 at equal angular intervals in the end flange 123 to accommodate the poles 128 of the two pole pieces 127 while holding it in the angular direction. The inner pole piece 127 is press-fit onto the plastic support hub 111, and the circular permanent magnet 130. and the outer pole piece 127 are assembled in the axial direction State due to the magnetic attraction of the permanent magnet 130 located in the middle and the opposite directed pole pieces 127 held.

The number wheel 60 is electromagnetically driven in the forward or additive direction, clockwise in FIG. 3 the selective and timely excitation of the drive coil 98 rotates about the number wheel 60 in increments like twisting a digital counter wheel. A one-way locking pawl 136 that is in the form of a light

909815/0909

- 12 -

Leaf spring is provided, is attached to the ring 90 of the stator core, with a protruding edge 138 on the periphery to cooperate on the end flange 123 of the support hub 111. the Protrusion edge 138 has a single shoulder or stop 140 that pawl I36 can engage when that Wheel 60 in the reverse or subtracting angular direction a little above its "0" count position (i.e., approximately one Quarter of a count or 9 ° beyond its "0" count position) is rotated to its "9" count position.

At each of the ten equally angularly spaced counting positions of the wheel 60 is one of the ten rotor poles 128 one polarity aligned radially with the receiver coil stator pole 91 and four other rotor poles 128 are opposite one another Polarity (i.e. on the other pole piece 127) radially with the Stator poles 92, 93, 96 and 97 aligned, the distances of 72 ° and arranged symmetrically with respect to the stator pole 91 are. The five salient poles 91 to 93 »96 and 97 therefore form a" secondary "magnetic circuit around the Detect the rotation of the rotor magnetically. In addition, the five stator poles 91 Dis 93, 96 and 97 cause an effective and preferentially holding the number wheel 60 at each full count position without the coil 98 or 99 energized.

The remaining two salient poles 94 and 95 of the stator are spaced apart by an angular distance of ⁰ 36 and preferably about half a count or 18 °

9D981S / 0SQ9
- 13 -

out of phase with and generally diametrically opposite the stator poles of the "secondary" magnetic circuit and form with the drive coil 98, which is attached to the stator pole 95 is, a "primary" magnetic circuit for turning the rotor in both angular directions from a previous one Position of an integer in relation to a subsequent position of an integer.

Each cycle for adjusting the wheel is activated by energizing the drive coil 98 (in the corresponding direction that the desired direction of rotation and the current wheel position) for a full time-controlled rotation cycle causes, in the initial period of time, the number wheel 60 from the previous integer position to a position is accelerated approximately in the middle between the preceding and the following position with whole counts in which the rotor poles are aligned with the salient poles of the "primary" magnetic circuit of the stator. The drive coil 98 remains energized for about the same but shorter last period of time, which is the continued rotation of the rotor in the desired direction and causing the rotor to stop at approximately its subsequent counting position is braked, after which the drive coil 98 is de-energized. The receiving coil 99 is called a substantially passive coil used to control the direction and angular velocity of the magnetic field of the permanent magnet 110 of the rotor and thus the direction and angle

909-1 B / 0909

- 14 -

speed of the number wheel 60 to be detected. Accordingly, the receiving coil 99 preferably has a larger number of Turns as the drive coil 98 to effectively detect the rotation of the wheel. When a rotor speed of Zero or approximately zero is detected, as described below, becomes the "primary" coil or drive coil 98 de-energized to complete the cycle of rotating the wheel with the wheel properly aligned in its subsequent Counting position is held by the "secondary" magnetic circuit.

Due to the friction of the wheel, the braking of the wheel will take place faster than the acceleration of the wheel. Of the The last period or period of time for braking is therefore shorter than the first period or period of time for accelerating. Even the "primary" magnetic circuit can be angularly in the forward direction or additive direction from the 1/2 count position of the number wheel be shifted slightly so that the rotation of the wheel is greater than during the first period the rotation of the wheel during the last period, and the wheel will stop at exactly the next full count position braked. In this case, the reverse rotation of the number wheel 60 (when the wheel is reset) with lower, but causes acceptable speed.

The number wheel 60 is therefore rotated by one count, that the polarity of the salient pole 95 with the help of the corresponding drive coil 98 in accordance

9Ö981B / Ö909
- 15 -

with the desired direction of rotation and the polarity of the neighboring ones Rotor pole 128 and therefore the current counting position of the number wheel is set. This is how the drive coil, for example 98 excited so that it forms an effective north pole to move the rotor in the additive or forward direction to rotate from an odd to an even count. On the other hand, an effective south polarity is established by excitation, to move the rotor in the additive direction from an even to an odd count. Around the number wheel To twist in the reverse or subtractive direction, the coil is energized to the reverse effective polarity to generate (i.e. south polarity to rotate the number wheel in the opposite direction from an odd to an even Counting position and north polarity to rotate the number wheel in the opposite direction from a straight line to an odd count). For example, the passive or feedback coil generates a relative positive voltage (+) when the number wheel moves from an odd number position to an even number in the additive or forward angular direction turns. It creates a negative relative voltage (-) when the number wheel moves from an even number position an odd number rotates in the additive or forward angular direction, and the reverse voltage polarity in the reverse Direction of rotation.

In the embodiment of FIGS. 1 and 2, the rotary decade module 58 preferably operated in an identical manner.

909815/0909

- 16 -

For this reason, only a single decade module 58 is shown schematically in FIG. 2 for the sake of simplicity shown.

The circuit 64 for operating the display uses a multiplex system 320 with an address counter 322 for sequential Addressing the BCD decades of the quantity and price counters 80 and 84, respectively, and for addressing other components of the Circuitry 64 for operating the display in synchronism therewith to energize the respective drive coils 98 for the display to control. The multiplex system 320 can alternate clock pulses from a suitable oscillator or a suitable Clock 324 is advanced via one of the three control switches 325, 326 or 327 and a counter 328 that divides by two will. A gate 329 is also provided to allow a marker pulse or "synchronization" pulse when alternating To generate clock pulses to drive certain components of circuit 64 to operate the display at the correct instant to mark. The control switch 327 is connected to be passed through the first step or the M-1 mode output a sequencer switch 330 is set for the display, so that it the address counter 322 by one or more Ten-step address cycles advances. The control switch 327 is reset via a timer 332 if any Ten step address cycle is complete, during which a "do not compare" signal (N-C) is asserted to a switch 334 · to be set. At the same time, the step sequence

Ö81S / OS09 - 17 -

ter 330 for display via a ÜNB-5far 335 to its subsequent M-2 mode or step switched.

The control switch 326 is connected to be activated by the third and fourth steps or M-3 and M-4 mode outputs of the sequencer switch 330 is set for display. The address counter is used for each of the third and fourth modes 322 is advanced by a single ten-step address cycle and control switch 326 is reset. and the sequence switch 330 is extinguished at the end of the address cycle.

Similarly, the control switch 325 is switched to be set by the M-5 mode output of the sequencer switch 330 so for the advancement of the address counter 322 to provide successive address cycles until the control switch 325 is reset via a detection gate 336 for the drive coil when all of the drive coils 98 for the Display are de-excited.

The circuit 64 for operating the display includes an addressable drive coil switch 220 (the north and south memory bits for each of the ten quantity and price indicators 58) for controlling the operation of each drive coil 98 in any direction. A two pole binary output of switch 220 for each display 58 is via an appropriate north / south selector 224 and a coil driver 226 connected to the

909815/0909

- 18 -

energizing talking drive coil 98 in accordance with the data stored in switch 220. A bipolar one binary input to switch 220 is connected via time gates 227 to a logic circuit 228 of suitable polarity so that that the two-pole switch input is excited (during of the M-1 mode of the sequencer 330) so as to set the forward / reverse operating mode circuit 64 for operating the display and the current odd / even digit position to reflect each display 58 during its addressing time -

While fuel is being dispensed, circuit 64 is used to Operate the display through an OR gate 239 in "forward" mode to move each digit wheel in the forward or direction move on in the additive counting direction. The circuit to operate the display will operate in reverse mode for most of the reset cycle (described below to reset all rotary displays together in the backward angle direction to "0".

The frequency of the oscillator or clock 324 is selected to give rise to a frequency of the addressing cycle there, which is substantially greater than the start / stop count rate of the number wheel 60 (that of the structure of the display 58 and the Voltage with which the drive coils 98 are operated). The frequency of the addressing cycle is also chosen so that

009815/0909

- 19 -

that the sequencer switch 330 by a sequential cycle of its M-1 mode can be switched to its M-5 mode before every start / stop count is ended.

An addressable BCD memory register 240 with ten decades is for registering the current digit positions of the five quantity ads or five price ads placed. As will be described below, each BCD decade of the Register 240 is switched on in the additive or subtractive direction synchronously with the corresponding display 58, in order to keep a registration of every advertisement position on an ongoing basis. The register 240 is also synchronized with the quantity and Addressed to price counters 80 and 84. A comparator 242 is for generating a "do not compare" signal during any Decade time switched during which the BCD decade of the storage register 240 is not counting the corresponding Decade of the quantity or price counter 80 or 84 corresponds.

While fuel is being dispensed, the sequencer switch 330 will cycle through a full cycle for display switched through to automatically turn each number wheel 60 that does not count the corresponding Decade of quantity or price counting (i.e. if the BCD counts of the corresponding decades of the auxiliary registers and the quantity or price counters 80 and 84 are not the same and a "do not compare" signal by the comparator

909815/0909

- 20 -

is produced). In particular, during the M-1 mode, the Sequencer 330 sends the "do not compare" signal each Decade effective via a control gate 246 to excite the drive coil by applying the appropriate north or south coil excitation ^ s-J.- ·: '.-- th (provided by logic circuit 228 for polarity) is written to switch 220 for the drive coil or switched. The appropriate drive coil 98 for the display is then selected via the appropriate selector 224 and driver 226 energized to begin counting by one step. At the same time there is the "do not compare" signal effective every decade via an AND gate 250 in that it is stored in a RAM 252 (random access memory; memory with any (random) access) writes a "step" signal or counting signal for the corresponding decade display.

The sequencer switch 330 is indexed to its M-2 mode at the end of each mode-1 addressing cycle while during which at least one decade "do not compare" signal is generated (and therefore during the period during which at least one of the drive coils 9Ö of the display is excited).

A delay circuit 254 for the step signal is then energized to delay a predetermined amount Generate time period before the sequencer switch 330 is switched to its M-3 mode. The predetermined time interval is selected to be approximately equal to the average time interval (in the operating environment of the

90981S / 0S09

- 21 -

^BATH

it

System and during the useful life of the displays) for a number wheel 60 is by passing it through the appropriate Drive coil 98 is accelerated to essentially its greatest angular velocity (at which then one of the permanent Magnetic pole 128 of the rotor is magnetically aligned with the salient pole 95 of the drive coil 98). Accordingly, after the predetermined delay, the receive or feedback coil 99 would die of any energized indication generate the greatest voltage indicating a rotation of the wheel.

Therefore, during the M-3 mode addressing cycle, the voltage generated by each feedback coil 99 for display via suitable high voltage limit comparators 258, 259 measured to determine whether the generated voltage V_ a predetermined relatively high voltage difference

a above or below a suitable reference voltage V. Has. This is to determine (a) that the speed of the number wheel has reached a predetermined value, which ensures that a step or count is performed. In addition, (b) should indicate the direction of rotation of the number wheel to be determined. A resulting signal for a (+) - or (-) - rotation is shown in the corresponding section of the RAM 252 stored during the M-3 mode addressing cycle.

During the M-4 mode addressing cycle, every rotary signal, which is stored in RAM 252 via a logical

909815/0909

- 22 -

Circuit 262 for the direction of rotation (the (+) and (-) inputs from RAM 252 and an odd / even input from the least significant bit of the auxiliary storage register 240) is converted into an "add" or "subtract" output signal. The "add" or "subtract" output is used as a +1 or -1 signal and via a suitable BCD summing circuit 264 is added to the current BCD count of the corresponding register decade and stored in the auxiliary storage register 240 is entered in order to bring the corresponding memory register decade up to date to the current to include ongoing rotation of the number wheel. Also becomes an appropriate one during the M-4 mode addressing cycle logic circuit 266 for detecting errors during the time of each decimal place turned on in order of the intended inputs to determine whether (a) each intended step or count is effected, whether (b) each step thus effected runs in the correct direction of rotation and (c) whether any additional non-associated or unintended steps or counts occurred or were caused. If any of these three possible error types occurs during the time of any count, an error signal is generated by the logic circuit 266 generated to detect errors, to operate an appropriate error indicator 268 and to set a switch 270, to switch off the fuel pump. Then the fuel pump can be switched on again and it

9 0 9 8 15/0909
- 23 -

For example, the fault indicator 268 can be reset by pressing a manually operated reset button 272.

During the subsequent M-5 mode of the sequential switch 330 for the display, the addressing counter 322 is repeatedly incremented via a control gate 325 through ten-step addressing cycles in order to determine when each number wheel that is rotated further is braked approximately to a stop by its corresponding drive coil 98 , the drive coil 98 then being de-energized. For this purpose, two low voltage limit comparators 274 and 275 are provided to determine when the generated voltage V _{0 of} the feedback coil falls within a predetermined narrow voltage range having a relatively low voltage b above or below the reference voltage Vr (which indicates that the number wheel has been braked by its corresponding drive coil 98 until it practically stops). In this case, a "stop" or "off" signal is generated by one of the comparators 274 and 275, respectively, to actuate the drive coil switch 220 via a control gate 276 to de-energize the corresponding drive coil 98 (Fig may have the "N" and "S" excitation inputs to switch 220 for the drive coil deenergized during the M-5 mode of sequencer 330).

When all of the drive coils 98 are de-energized, a signal is generated through a suitable AND gate 336 to the control gate

909816/0909
- 24 -

325 to reset and to switch the sequence switch 330 to its M-0 mode. The sequencer is then switched to begin a new comparison cycle to the stored counts of the BCD decades the auxiliary register 240 with the corresponding decades the quantity and price counters 80 and 84 to compare.

It can thus be seen that the auxiliary register 240 indexes to store the quantity count indicated by the quantity register 16 and the price count which is indicated by the price register 14. It can further be seen that every time the Quantity counter 80 and / or price counter 84 can be advanced, step sequence switch 330 by a complete Advance cycle is advanced to advance the quantity and price displays so that these are the accumulated Represent price counts. When the price and / or quantity counters 80 and 84 indexed at one rate that is greater than the walking speed of the display, the step sequencer 330 will continue to set the and price displays 58 advance at the greatest possible speed until the quantity and price displays have accumulated Show counts of quantity and price counters 80 and 84.

Immediately before the start of the delivery of fuel when the control lever 36 is in its "on" position or horizontal position

909815/0909
- 25 -

is rotated, the display circuit 64 and price pulse generator 68 are reset in order to prepare the system to properly register and display subsequent fuel delivery. For this purpose, when the handle 36 is rotated to its "on" position, a step sequence switch 290 is indexed for the reset cycle so that it resets the quantity and price counters 80 and 84 to zero and so that it has the step sequence switch 330 in its M- 5 mode (so that any drive coils 98 that are still energized are de-energized when the handle 36 is turned off and then turned back on immediately.) The sequential switch for the reset cycle is then advanced by the following M-0 signal so that it provides a first jerk cycle during which a ^M do not compare "signal is asserted to energize all of the drive coils 98 for the display. An "odd" signal is also applied to logic circuit 228 for polarity and logic circuit 262 for direction of rotation, and a "reverse signal" is applied to indicate reverse rotation of the display. It is therefore assumed that all of the dials 60 of the display are currently in an odd numbered position and are being advanced in the reverse or subtracting direction to the next lower even numbered position. It is also initially assumed that each digit wheel 60 is in its odd number "9" position, which is an

909816/0909

- 26 -

Maximum number of nine steps for advancing the number wheel in the rearward direction to its "0" position.

During the first reset step cycle, the
Sequence switch 330 for display one cycle to advance each display by one count. During the display indexing cycle, the direction of rotation logic circuit 262 reports the direction in which each display wheel is indexed (in the reverse or subtracting direction if the digit wheel 60 was in an odd number position, and in the forward direction if that Number wheel 60 was in an even number position). When a "subtract" signal or "-T" signal is generated,
the "accept 9" current BCD count of the corresponding BCD decade of register 240 is applied to BCD summing circuit 264 via control gate 300 and an updated "8" BCD count is then placed in the corresponding one Auxiliary storage register decade of storage register 240 is written. When an "add" signal or

"+1" signal is generated, indicating that the digit wheel 60
has been in a place with an even number, will
an "8 accepted" current BCD count is applied to summing circuit 264 via control gate 300, and
an updated "9" BCD count is written into the appropriate decade of the auxiliary storage register.

909815 / 0.909

- 27 -

it

In addition, during the first reset step sequencing cycle, error detection logic 266 overrides an output control gate 306 is switched off, otherwise an "add" signal or a "+1" signal would generate an "error" signal, actuating the error indicator 268 and shutting down the pump would.

After the ten BCD decades of the auxiliary storage register 2AO have been provided with an 8-BCD count (the display was previously in a position with an odd number and had originally been moved further in the reverse or subtracting direction) or with a 9-BCD count (with the display in an even number position and originally advancing in the forward or additive direction), the reset cycle sequencer 290 is indexed to its next step to index each of the number wheels 60 in the reverse direction to "0". When each number wheel 60 reaches "0" (and when its one-way locking pawl I36 prevents further reverse rotation of the wheel 60 beyond "0"), a rotation signal will no longer be generated by the limit comparators 258 and 259, and it an "add" signal or "subtract" signal is therefore no longer generated by the logic circuit 262 for the direction of rotation. It is therefore a BCD ¹¹ O "count into the corresponding BCD decade of the auxiliary storage register 240 via

909815/0909

- 28 -

3 «

the gate circuit 300 and the summation circuit 264 are fed will. Accordingly, when a digit wheel 60 reaches "0" before the corresponding auxiliary storage register decade, its Drive coil 98 can only be energized during the subsequent step cycle, during which the corresponding auxiliary storage register decade switched back to "0" and the logic circuit 266 for detecting errors via the control gate 306 is turned off to avoid generating an "error" signal. After all number wheels are 60 in reverse Direction are switched to "0" and after all auxiliary memory register decades have also been reset to "0", the original reset phase of the reset cycle is completed.

A final phase or phase is then commenced to check the display of the reset cycle in order to check that each display 58 (a) is indeed reset to "0" and is not accidentally or undesirably fixed in a position with any other number, and that (b) them in each Angular direction works satisfactorily. For this purpose, the reset cycle sequence switch 290 becomes a subsequent one Step indexed to "forward" and "do not compare" signals for a full cycle of the sequencer 330 to submit. It is then switched to two subsequent steps, "Backward" - and "Do not compare" signals for two full "backward checks" -

909815/0909

- 29 -

2842351

Generate cycles of the sequencer 330. During the phase of the reset cycle for checking the display, if it is working properly, each number wheel 60 forwards one count or one step and then afterwards Moved backwards by one count or one step back to "0". During the second "reverse O check" cycle each display should be held against rotation by the corresponding latch I36, which locks in one direction, and a rotation signal should not be generated. During the second "O-backward check" cycle of steps, therefore, the "Step" connection to RAM 252 through gate 296 is cut off and any wheel rotation signal becomes an "error" signal to activate fault indicator 268 and shut off the pump.

After completion of this last phase or display test phase of the reset cycle, the reset cycle sequencer 290 is indexed to its "O" step or wait step, and the pump motor 42 is energized so that the pump is ready to dispense fuel.

Although in the display system described, the receiver coil 99 is only used to determine the direction and angular velocity of the number wheel 60 is used, it goes without saying that the receiver coil 99 is also used in conjunction with the Drive coil 98 could be used (as shown e.g. in

§09815 / 0909
- 30 -

U.S. application serial no. 706 129) in order to participate in the further turning of the number wheel 60. In this case, although the receiver coil 99 may be energized by the time it is "read" (depending on the cycle used to index two coils), the voltage difference between the applied voltage V _R and the generated voltage Vg would still be sufficient to determine the direction and angular speed of the number wheel 60 as in the embodiment described.

909815/0909
■ - 51 -

Blank page

Claims (1)

Claims 1. Method of counting by step-by-step electromagnetic Turning a number wheel in one direction of rotation to a number of consecutive ones at the same angular distance arranged display positions, characterized in that the electromagnetic number wheel (60) is excited in an angular direction from one to the next display position that the speed of rotation of the number wheel (60) is detected electromagnetically at least when braking to the next display position, and that the electromagnetic digit wheel (60) is de-energized when the detected speed falls below a predetermined value. 909815/0909 2. The method according to claim 1, characterized in that after a predetermined period of time Excitation of the electromagnetic number wheel (60) electromagnetically the speed is detected. 3. The method according to claim 1 or 2, characterized in that the greatest rotational speed of the number wheel (60) at least during the period after the excitation of the electromagnetic number wheel (60) electromagnetically is detected in which the greatest rotational speed of the number wheel (60) is expected, and that faulty operation is indicated when the electromagnetically detected greatest speed has a value that falls below a predetermined value. 4. The method according to any one of claims 1 to 3 »characterized in that the number wheel is selectively can be rotated electromagnetically in both angular directions that the electromagnetic number wheel (60) in opposite directions Energized to the number wheel (60) in opposite angular directions and in different directions of directions to rotate different positions of the number wheel (60) in each angular direction, and that the electromagnetic The number wheel is excited in a direction that is determined by the current position of the number wheel (60) and a selected angular direction results. 8G981S / U9Ö9 5. The method according to any one of claims 1 to 4, characterized in that the number wheel (60) a Even number of display positions that the electromagnetic number wheel (60) in different directions from different Display positions is excited that the direction of rotation of the number wheel during electromagnetic detection (60) is detected, and that it is checked whether the detected direction of rotation of the number wheel (60) the desired angular direction is. 6. The method according to any one of claims 1 to 5, characterized in that the number wheel (60) on its next display position is held magnetically after the electromagnetic dial (60) is de-energized. 7. Method of counting by step-by-step electromagnetic turning of a number wheel with decimal display of 0 to 9 to a number of consecutive display positions arranged at the same angular distance in both directions of rotation, characterized in that the electromagnetic number wheel (60) is different from its current Decimal display position to approximately the following decimal display position is energized, with the electromagnetic number wheel being energized in opposite directions to the Numeric wheel (60) in opposite angular directions and in different directions at different display steps of the Turn the number wheel in any angular direction, with the electromagnetic number wheel (60) in a selected direction is energized to rotate the dial (60) in a selected angular direction from the current decimal display position in to move the next decimal display position, the direction of rotation of the number wheel (60) being detected electromagnetically and the detected direction of rotation is compared electronically with the selected angular direction. (8J device for displaying a count in a multi-digit decimal range with a series of decade displays with a series of electromagnetic decimal digit wheels, characterized in that each electromagnetic digit wheel (60) is excitable in an angular direction from one to the next display position of the ten decimal display positions so that it is rotatable approximately from the current display position to the next display position, and that the speed of rotation of the wheel can be detected electromagnetically, with electronic registers for energizing the electromagnetic digit wheels deviates from the corresponding number of the electronic register, and that the corresponding number wheel can be de-energized by the electromagnetic detection devices when it is approximately on the next e display position is set. 909815/0909 9 ". Device according to claim 8, characterized in that the electrical drive devices Control means for selectively energizing and de-energizing the electromagnetic digit wheel each decade, wherein the means for energizing is operable by the electronic registers to selectively energize the control means to actuate each electromagnetic display in the desired direction, if the current decimal display of the corresponding The content of the decimal numbers in the electronic register differs, and that devices for de-energizing are provided, which can be actuated by the means for electromagnetic detection of each decade display to determine the corresponding to de-energize the electromagnetic number wheel when it is approximately in the next display position. 10. Device according to claim 8 or 9, characterized in that the electric drive devices a series of electronic auxiliary decades for the series of decade displays that they have electrical switching devices to advance each auxiliary decade by a number, if the corresponding electromagnetic The number wheel is advanced, and that they have comparison devices for comparing each auxiliary decade with the corresponding one Decimal place of the contents of the electronic register, with a discrepancy between the two Values the corresponding electromagnetic number wheel can be excited in a suitable manner by the control devices. 909815/0909
- 5 - 11. Device according to one of claims 8 to 10, characterized characterized in that the electrical means for switching means for detecting a Rotation speed above a certain value. Each digit wheel has the corresponding auxiliary decade to increment a count when the number wheel rotates at a higher speed than the predetermined one is detected. 12. Device according to one of claims 8 to 11, characterized characterized in that the means for detecting are designed to determine the direction of rotation of each indicator wheel are, the corresponding electromagnetic detection devices for switching the corresponding Auxiliary decade are formed in the corresponding direction. 13. Method for counting by step-by-step, electromagnetic turning of a number wheel in one direction of rotation a number of consecutive display positions arranged at the same angular distance, characterized by g e k e η η, that the number wheel in the opposite angular direction to reset the number wheel to one predetermined reset counting position, which is determined by a one-sided stop, is rotatable that the number wheel can be excited in one of the two angular directions in a single step in a direction that is determined by the 909815/0909 ment of the number wheel and the direction of rotation depends, the electromagnetic number wheel of the current display position accelerated and braked when approaching the next counting position, with the electromagnetic number wheel in a direction is excited, which results from the current and the next desired display position that the speed of rotation of the digit wheel is detected at least electromagnetically, while the Zif f ernrad to the next display position is decelerated out, and that the electromagnetic number wheel is de-energized when the electromagnetically detected Rotation speed falls below a predetermined value, the number wheel is reset by turning it in the opposite direction Angular direction is rotated to the predetermined reset display position and detected by electromagnetically that the dial has reached the reset display position by detecting that the speed of rotation of the number wheel falls below a predetermined value when the electromagnetic number wheel then is energized again to advance it one more step in this opposite angular direction. 14. Display device for a fuel pump for Display the fuel gauge in a multi-digit display with a series of display decades with a series of decimal number wheels, characterized in that each display decade has an electromagnetic number wheel, that has a rotor with permanent magnetic protruding po- §09315 / 0908
- 7 - len with an annular arrangement of ten poles alternating Has polarity at the same angular intervals with which an electromagnetic stator with salient poles interact having a stator core with a ring generally coaxial with the rotor, wherein a plurality the protruding stator poles arranged at angular intervals with the corresponding protruding poles of the permanent magnetic Rotor can be aligned when the rotor is rotated 360 ° that first coils on the stator core are arranged to rotate the corresponding number wheel rotor and thus the number wheel from a decimal display point to the next are excitable, and that second coils are provided on the stator core to rotate the permanent magnetic wheel rotor to detect, and that register driver to selectively energize the first coils of each Display decade are provided for a period of time which is determined by the corresponding second coils to the series of number wheels to display the amount of fuel and / or the price of fuel, with the register drivers have electronic registers for electronically registering the multiple positions display of fuel or price, and that electric drive means are operable in accordance with the content of the electronic registers to the first To energize the coils of each display decade to move the corresponding digit wheel from the current decimal display position twist, with the electric drive devices by 909815/0909 1842951 the second coils can be actuated to de-energize the first coils when the corresponding number wheel is approximately in its next display position. 15. The apparatus according to claim 14, characterized ge ke η η that the electric drive devices have a number of auxiliary decades for the series of display decades, which are each switchable to a subsequent number together with the corresponding display decade, that electrical switching devices are provided to to advance each auxiliary decade when the corresponding display decade is energized in order to keep the corresponding auxiliary decade and display decade synchronous, that comparison means are provided to compare the count of each auxiliary decade with the corresponding registered count of the electronic register, and that electrical control devices are provided which operable by the comparison means when mutually corresponding Dezimalzählungen the electronic register and the number of auxiliary decades differ to excite the corresponding first coil to rotate to the corresponding digit wheel. 16. The apparatus according to claim 14 or 15i, characterized in that the electric drive devices control devices for the first coils for the selective excitation and de-excitation of the first coils of each display decade, control devices for excitation, which by the elec- 309315/0908 Ar tronic registers are operable to control the devices for the first coils to actuate the first coils of each display decade by energizing from the current display position to switch to the next, and have control means for de-energizing, which by the second coils of each display decade are operable to selectively de-energize the control devices for the first coils, if the appropriate Dial has approximately reached its next display position. 17. Device according to one of claims 14 to 16, characterized characterized in that the stator core has first and second magnetic circuits which have a phase difference of about half a count, the first magnetic circuit having a first salient pole and at least has another salient pole that is angularly spaced from the first to be alignable accordingly with poles of the rotor of opposite polarity, the second magnetic circuit having a first pole and a plurality of additional salient poles, the Number of additional poles is at least one greater than the number of poles in the first magnetic circuit, the one Angular distance from the first pole of the second circle to be alignable with the rotor poles of opposite polarity to be, wherein the first coils are linked to the first magnetic circuit to the first magnetic circuit in each direction selectively magnetize, and wherein the second coils are linked to the second magnetic circuit to rotate the to detect the rotor of the display wheel. 909815/0909 - 10 -