EP0249501B1 - Anti-theft apparatus and method - Google Patents

Anti-theft apparatus and method Download PDF

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Publication number
EP0249501B1
EP0249501B1 EP19870305259 EP87305259A EP0249501B1 EP 0249501 B1 EP0249501 B1 EP 0249501B1 EP 19870305259 EP19870305259 EP 19870305259 EP 87305259 A EP87305259 A EP 87305259A EP 0249501 B1 EP0249501 B1 EP 0249501B1
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EP
European Patent Office
Prior art keywords
rack
weight
product
product units
theft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP19870305259
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German (de)
English (en)
French (fr)
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EP0249501A3 (en
EP0249501A2 (en
Inventor
Kenneth W. Bullivant
Sam C. Falco
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
K Tron International Inc
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K Tron International Inc
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Publication date
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Priority to AT87305259T priority Critical patent/ATE61678T1/de
Publication of EP0249501A2 publication Critical patent/EP0249501A2/en
Publication of EP0249501A3 publication Critical patent/EP0249501A3/en
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Publication of EP0249501B1 publication Critical patent/EP0249501B1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F10/00—Furniture or installations specially adapted to particular types of service systems, not otherwise provided for
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1472—Mechanical actuation by lifting or attempted removal of hand-portable articles with force or weight detection
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07G—REGISTERING THE RECEIPT OF CASH, VALUABLES, OR TOKENS
    • G07G1/00—Cash registers
    • G07G1/0036—Checkout procedures
    • G07G1/0045—Checkout procedures with a code reader for reading of an identifying code of the article to be registered, e.g. barcode reader or radio-frequency identity [RFID] reader
    • G07G1/0054—Checkout procedures with a code reader for reading of an identifying code of the article to be registered, e.g. barcode reader or radio-frequency identity [RFID] reader with control of supplementary check-parameters, e.g. weight or number of articles
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07G—REGISTERING THE RECEIPT OF CASH, VALUABLES, OR TOKENS
    • G07G3/00—Alarm indicators, e.g. bells
    • G07G3/003—Anti-theft control

Definitions

  • the invention pertains to anti-theft devices and methods for consumer product racks.
  • a fundamental requirement of product display racks used in a retail environment is that they present the product in an aesthetically pleasing and readily accessible manner in order to promote product sales.
  • the rack should also provide some means of indicating when products have been removed from the rack for the purpose of theft rather than for purchase.
  • transparent barriers are provided on display racks which allow stacked products to be removed one at a time from the bottom of the stack.
  • the products are removable only through a slot or the like in the transparent barrier aligned with the bottom of the stack of products. Requiring products to be removed only one at a time clearly discourages multiple product purchases.
  • product display racks which provide protection against shoplifting either present an intimidating display by enclosing the product in a protective barrier, or require the intervention of a salesperson to facilitate legitimate removal of product, or both.
  • US-A-4108363 describes a vending machine which has a means for monitoring the weight of items within the vending machine. Removal of one or more items from the vending machine results in a change of weight, which is detected.
  • the vending machine also has means for calculating the number of items removed corresponding to a detected change in weight.
  • An alarm device is also described which may be sounded if a calculated number of items removed is greater than a predetermined limit.
  • This document does not however disclose a means whereby the number of items removed is calculated separately from the detection of a weight change. In addition, this document does not disclose means whereby the calculations may be made over a predetermined time interval and alarms are generated where limits are over-reached within the time interval. There is also no disclosure of means for determining if swapping of items has occurred or the vending machine and/or the items within it have been disturbed.
  • the present invention seeks to avoid the above-identified failings by providing a display rack which detects theft while providing no physical barrier to product removal, and while requiring no sales-person intervention for legitimate product removal.
  • a method of indicating removal of product units from a product unit rack including the steps of: monitoring the weight of the rack; detecting changes in the weight; and calculating the number of product units corresponding to each of the changes detected; characterised by the further step of providing an indication of removal if the sum of the number calculated of product units is greater than a limit during a time period.
  • the present invention seeks to detect rack tampering such as the "swapping" of other products for product units in the rack in an attempt to defeat the system by providing a method of indicating disturbance of a product rack containing product units including the steps of:
  • the present invention provides a method of indicating disturbance of a product rack containing product units including the steps of: consecutively sampling the weight of the rack; and calculating differences between consecutive samples; characterised by the further step of providing an indication of disturbance if a successive number of differences calculated, greater than a limit number, are each greater than a first threshold and less than a second threshold.
  • the present invention also provides a method of indicating theft of product units from a product unit rack including the steps of: monitoring the weight of the rack including the product units; detecting changes in the weight; calculating the number of product units removed corresponding to each of the changes detected; and providing a first indication of theft if the number calculated of product units removed is greater than a first limit; characterised by the further steps of: providing a second indication of theft if, during a first time period, the number calculated of product units removed is greater than a second limit; providing a third indication of theft if the number of consecutively detected weight changes, not corresponding to product unit removal, exceeds a third limit; and providing a fourth indication of theft if the number of detected weight changes, not corresponding to product unit removal, exceeds a fourth limit during a second time period.
  • the present invention also provides a method of indicating unauthorised removal of product units from a product unit rack including the steps of: monitoring the weight of the rack; detecting a disturbance of the rack, according to the monitored weight; characterised by the further step of: separately calculating the number of product units removed from the rack, in response to the detection of a disturbance, corresponding to the difference in monitored weights before and after the disturbance; and providing an indication of unauthorised removal if the number calculated of product units removed from the rack is greater than a programmable limit.
  • the present invention provides an anti-theft apparatus for use in a product unit rack, or the like comprising: a weight sensor for sensing the weight of the rack having product units therewith; means for detecting changes in the weight; means for calculating the number of product units removed from the rack for each detected change in the weight; and means for indicating theft if the calculated number for a given change is greater than a first limit; characterised in that there is further provided; means for calculating the sum of the numbers calculated of product units removed for a series of detected changes in the weight; and means for indicating theft if the sum is greater than a second limit during a time period.
  • the present invention provides an anti-theft apparatus for use in a product unit rack, or the like, including: means for measuring the weight of a group of product units; means for detecting changes in the weight; and means for calculating the number of product units removed from the group of product units for each of the changes detected according to the magnitude of each of the changes detected; characterised in that there is further provided: means for calculating the sum of the numbers calculated of product units for each of the changes detected occurring during a time period; and means for indicating theft if the sum is greater than a limit.
  • the present invention also provides an anti-theft apparatus for use in a product unit rack, or the like, including: means for measuring the weight of a group of product units; and means for detecting changes in the weight; characterised in that there is further provided: means for detecting the number of weight changes detected having magnitudes less than a predetermined value corresponding to removal of one product unit from the group of product units; and means for indicating product unit theft if the number detected is greater than a limit during a time period.
  • the present invention provides an apparatus for detecting theft of product units from a group of product units characterised in that there is provided: means for sampling the weight of a group of product units at a substantially constant rate; means for calculating differences between successive weight samples: means for indicating theft of product units from the group of product units if the number of the differences calculated between successive weight samples exceeds a limit.
  • an anti-theft apparatus for use in a product unit rack, or the like including: means for measuring the weight of a group of product units; and means for detecting disturbance of the group of product units, responsive to said means for measuring; characterised in that there is further provided: means for separately calculating the number of product units removed from the group of product units according to a difference between the measured weight of the group of product units before a detected disturbance and the measured weight of the group of product units after the detected disturbance, responsive to said means for detecting disturbance; and means for indicating theft if the number calculated of product units removed from the group of product units exceeds a limit.
  • the number of product units that must be removed in order to sound either the instantaneous or periodic alarm is variable, as are the time periods required for periodic removal and for detection of disturbances. Therefore, the present invention is applicable to retail environments having high sales volume or low sales volume by simply reprogramming the various limits.
  • the rack of the present invention is alarmed at all can be made completely transparent to the consumer because no physical barriers appear between the consumer and the product.
  • the product is not restrained in any way from removal by a legitimate consumer. Also, intervention of a sales person is not required for the removal of products.
  • the present invention can also sound a remote alarm by wire or radio link.
  • the invention also provides a local acknowledge tone when product units, less in number than the alarm limit, are removed from the rack.
  • the local acknowledge tone notifies the customer that the display is monitored further discouraging theft.
  • the acknowledge tone may be used in addition to or replaced by a synthesized voice which repeats a suitable salutation upon product removal.
  • the local alarm and acknowledge tone or voice may be silenced so that only the remote alarm sounds.
  • the display rack can be used with a key lock switch which allows the theft prevention feature of the invention to be disabled for restocking of the rack.
  • the key lock switch may also be used to place the display rack in a lock-up mode in which the display rack will cause an alarm if any disturbance of the rack is sensed. This serves to reduce employee theft during periods when a store is closed but employees are present.
  • the key lock switch may be used to place the display rack in a normal operating mode.
  • the key lock switch may be replaced by, or used in addition to, a switch controllable by a real-time clock.
  • the real-time clock controls the switch to modify the various programmable alarm limits, and to automatically place the system in the lock-up mode dependent upon time of day.
  • the present invention is also applicable to warehouse racks, such as palets and the like, upon which products are stored.
  • the present invention allows such warehouse racks to be protected from product theft without providing expensive anti-theft measures such as lockable cages, and the like.
  • the present invention seeks to provide therefore a rack for consumer product units that reduces loss of revenue due to shoplifting or employee theft, but that does not discourage legitimate product purchases.
  • This invention also seeks to prevent consumer product theft from a product rack by monitoring the weight of the rack holding the consumer products, and by providing an indication, such as an alarm, that a number of product units, in excess of a programmable number of units, have been removed from the rack.
  • the present invention seeks to provide a consumer product rack that provides an indication, such as an alarm, that a number of product units, in excess of a programmable number of units, have been removed from the rack during a programmable time period.
  • the present invention also seeks to deter "swapping" of other merchandise for product units contained in a consumer product rack by providing an indication, such as an alarm, that the rack has been disturbed continuously for more than a programmable time period, or that the rack has experienced a number of disturbances, in excess of a programmable number of disturbances, during a programmable time period.
  • Fig. 1 is an isometric view of a consumer product rack according to the present invention.
  • Fig. 2 is a partial sectional view of the base of the rack shown in Fig. 1, showing the mechanical details of a weight sensor used in the present invention.
  • Fig. 3 is a block diagram of the electrical schematic of the present invention.
  • Fig. 4A-4D are a flow chart detailing the computational steps of the theft detection routine of the present invention.
  • Fig. 5 is a flow chart of the computational steps of the alarm routine of the present invention.
  • a consumer product rack 10 includes a number of individual compartments 11, each compartment holding a plurality of consumer product units 12 such as, for example, cartons of cigarettes. While rack 10 of the preferred embodiment is a display rack intended for placement in a retail establishment, it will be understood that the present invention is equally applicable to other product racks, such as warehouse palets, and the like.
  • Rack 10 resets on base 13 which is supported by a plurality of feet as shown in detail in Fig. 2.
  • Fig. 2 is a sectional view of a portion of base 13, the detail of the placement of weight transducers used in the present invention is disclosed.
  • Each transducer 16 is placed between a foot 17 and bracket 18.
  • Bracket 18, in turn, is connected to base 13 by appropriate attachment means 19 such as screws or rivets.
  • a plurality of weight transducers 16 are placed at a plurality of points beneath base 13 so that the entire weight of rack 10 (Fig. 1) can be accurately sensed by the plurality of weight transducers.
  • Each weight transducer is connected to the weight signal processing circuitry of the present invention (shown in detail in Fig. 3) by conductor 21 and connector 22.
  • Weight transducers 16 are preferably of the highly accurate vibrating wire-type which produce a voltage signal having a frequency which varies in proportion to the weight sensed by the transducer.
  • the invention uses a central processingunit (CPU) 31 to perform the calculations and to control the various input/output operations of the present invention.
  • CPU central processingunit
  • Processor 31 can be, for example, a type 8031 microcomputer available from Intel Corporation.
  • processor 31 Connected to processor 31 are data bus 32 and address bus 33. Buses 32 and 33 allow processor 31 to communicate with the various other hardware components of the present invention.
  • Processor 31 communicates with read only memory (ROM) 34 and random access memory (RAM) 36.
  • ROM 34 is used to store the control program of the present invention shown in Figs. 4A-4D and 5, while RAM 36 is used as a scratch pad memory.
  • ROM 34 can also store the synthesized voice of the acknowledge salutation. It should be noted that both ROM 34 and RAM 36 may be located within processor 31, such as, for example, in a type 8051 microcomputer available from Intel Corporation.
  • the individual weight sensors 16 are connected by conductors 21 to respective frequency counters 37 which, in turn are connected to data bus 32 and address bus 33.
  • the individual frequency counters 37 count the frequency of the voltage produced by respective weight sensors 16, and produce a binary word indicative of sensed weight which is placed on data bus 32 when interrogated by processor 31 via address bus 33.
  • a typical accumulation period for counters 37 is 0.25 seconds.
  • counters 37 are reset and a new count is begun.
  • Fig. 3 shows only three sets of frequency counters and weight sensors, any number of sensors and counters can be used in the present invention.
  • Frequency counters 37 can be, for example, type 8253 frequency counters manufactured by Intel Corporation.
  • controller 38 Also connected to data bus 32 and address 33 is input/output controller 38 which can be, for example, a type 8155 controller available from Intel Corporation. Controller 38 is connected to ganged switches S1 and S2 which allow a user of the system to program the system for a specific application. Details of this programmability will be discussed below.
  • amplifier 39 which powers alarm speaker 41.
  • Speaker 41 produces both a local acknowledge tone and a local alarm.
  • a synthesized voice signal may be stored in ROM 34 and may be played instead of, or in addition to, the acknowledge tone.
  • the volume of the acknowledge tone or voice is controlled by potentiometer 42, and the volume of the local alarm signal is controlled by potentiometer 43.
  • the tone and duration of the acknowledge signal and the local alarm are adjustable by use of potentiometers 45-48.
  • One end of each potentiometers 45-48 is connected to a voltage source + V, and the other ends are grounded.
  • the wiper of each potentiometer is connected to analog-to-digital converter 49 which, in turn, is connected to controller 38.
  • Analog-to-digital converter 49 can be, for example, a type ADC0844 converter manufactured by National Semiconductor Corporation.
  • Three position key lock switch 50 is also connected to controller 38.
  • switch 50 When switch 50 is in a first position, the display rack is in a normal mode with all features active. In a second position, key lock switch 50 disables the theft prevention features of the present invention to allow restocking.
  • Switch 50 can also be positioned in a third position which places the rack in a night lock-up mode In the night lock-up mode, any disturbance of the rack will cause an alarm.
  • Processor 31 is also connected to data output bus 51 which can be used to drive a display or printer (not shown) for the purpose of monitoring the weight of the system or monitoring the disturbance activity or purchase activity of the system.
  • Processor 31 is also connectable to remote alarms 52 through individual links 53.
  • Alarms 52 can be located far from the product display rack for remote monitoring of the system. If desire, the local alarm can be reduced to zero volume and the product display rack can be monitored using only remote alarms 52.
  • Links 53 are preferably wire or radio link.
  • a preferred radio link may use, for example, a type D-24A transmitter 54 and a type D-67 receiver manufactured by linear electronics of Carlsbad, California. Since this preferred transmitter 54 is powered by an internal battery and sends a signal when its control contact is open, this allows an alarm signal to be sent to remote alarms 52 when the display rack becomes unpowered or if the connection between processor 31 and links 53 is severed. Links 53 can also be used to actuate a video camera which will record activity in the vicinity of the protected rack.
  • links 53 are wire, elements 54 in Fig. 3 can be appropriate line drivers.
  • Switch S1, S2 are used by a system operator to manually program various system parameters as described in detail below.
  • the manual settings of switches S1 and S2 may be overriden by contacts within switch S3.
  • Switch S3 is controlled by real-time clock 55.
  • Clock 55, in combination with switch 53 allows one or more of the various parameters to be automatically programmable dependent upon time of day.
  • Clock 55 and switch S3 can also be used to automatically place key-lock switch 50 in the lock-up mode, for example, when a store is closed.
  • parameter K4 which is the periodic unstable episode limit is set equal to 5.
  • this limit could also be programmable with the addition of additional switches.
  • the remaining switches (1-3 of S2) are used to designate the number of weight transducers on a particular display rack. This allows the same theft detection hardware to be applied to various sizes of racks using various numbers of weight transducers. Also, it allows the system to detect if a weight transducer has been disconnected.
  • the number of valid transducers is set according to the following Table.
  • switches S2-1, S2-2 and S2-3 When switches S2-1, S2-2 and S2-3 are all closed, the local alarm or voice is turned on thereby allowing the tone and volume to be set as described earlier. When switches S2-1, S2-2 and S2-3 are all open, this state is ignored as an invalid setting. Therefore, according to the preferred embodiment, at least one and up to six weight transducers may be used. Once again, this should not be considered a limitation of the present invention. Additional transducers can be obviously accommodated by adding additional switches.
  • control is transferred to block 57 where the first weight reading, WTRDGl, is taken.
  • the weight is determined by interrogating the individual weight sensors 16 via frequency counters 37 (both shown in Fig. 3), and by summing the individual sensed weights. In this manner, the entire weight of the display rack is sensed.
  • the units of variable WTRDG1 are in 100ths of product units. Therefore the actual weight sensed by sensors 16 must be multiplied by a predetermined factor in order to convert the actual sensed weight into a weight in 100ths of product units. If, when taking weight reading WTGRDG1, the system detects weight signals are being produced by less than the number of transducers set by switches S2-1, S2-2 and S2-3 according to Table VI, an alarm is sounded.
  • Control is then transferred to block 58 where variables WTRDG2, WTRDG3 and PREWT are all set to WTRDG1.
  • the program then enters the main loop of the routine beginning with block 59 where, with operation identical to that of block 57, the weight WTRDG1 is again sensed, and it is determined if the number of transducers is less than that indicated by switches S2-1, S2-2 and S2-3 according to Table VI. Control is then transferred to block 61 where cycle counter CYCLCNT is incremented by 1 and counter OLDCYCL is set equal to counter CYCLCNT less K5.
  • Control is then transferred to motion detection decision blocks 62-64.
  • the three stored weight readings WTRDG1, corresponding to the present weight, WTRDG2, corresponding to the last sensed weight, and WTRDG3, corresponding to the penultimate sensed weight are each subtracted and the differences are compared with parameter K0. If the difference between any two of the sensed weights is greater than parameter K0, flat MOTFLAG1 is set equal to "1" in block 66. Otherwise, flag MOTFLAG1 is set equal to "0" in block 67. Control is then transferred to decision block 68 where the state of MOTFLAG1 is detected. If flag MOTFLAG1 was set in block 66, counter MOTCNT is incremented by 1 in block 69. Otherwise, counter MOTCNT is set to 0 in block 71, counter MOTCNT keeps track of the number of consecutive cycles wherein motion is detected.
  • counter MOTCNT is compared with parameter K2 in decision block 72. If counter MOTCNT is greater than parameter K2, indicating that the number of consecutive unstable episodes is greater than the desired limit, control is transferred to block 73 where variable ALARM is set equal to "2", counter MOTCNT is reset in block 74 and the alarm is sounded in block 76 (processing steps described in detail with reference to Fig. 5). This ends the motion detection portion of the routine.
  • Control is then transferred to decision block 77 where detection of the number of product units removed is begun.
  • variable PREWT is set equal to the last sensed weight, WTRDG2, if MOTFLAG1 is equal to "1" and if flag MOTFLAG2 is equal to "0" as determined in decision block 77.
  • decision block 77 determines if motion is detected during the present cycle when none was detected during the previous cycle.
  • Control is then transferred to decision block 79 where it is determined if no motion was detected during the present cycle, but that motion was detected during the previous cycle. This is accomplished in decision block 79 which interrogates flags MOTFLAG1 and MOTFLAG2. If true, control is transferred to block 81 where the integer number of product units removed is determined by the rounding formula shown. Using this formula, weights less than 0.49 units are rounded down, weights between 0.50 and 1.49 units are rounded to 1, and so forth. Control is then transferred to decision block 82 where it is determined if any product units were removed.
  • block 84 determines if the detected number of units removed from the rack is greater than the instantaneous removal limit. If so, control is transferred to block 86 where variable ALARM is set equal to "1" and the alarm is sounded in block 87. This ends the instantaneous removal detection portion of the routine.
  • Control is then transferred to block 88 where the routine for determining the number of unstable episodes occuring during time period K5 is determined.
  • counter N is set equal to "0" and control is transferred to a loop beginning with block 89 where counter N is incremented.
  • motion vector MOTPER(N) is a time stamp vector in which the individual entires record the cycle number when motion was detected when that motion was determined not to be a removal of an integer number of product units.
  • Control is then transerred to decision block 94 where if there has been no motion detected during the present cycle and if there was motion detected during the past cycle, and if the number of product units removed is less than 1, control is transferred to block 95 where counter N is set equal to "0".
  • counter N is incremented and consecutive entries of vector MOTPER(N) are interrogated and determined if equal to 0 in block 97.
  • control is transferred to block 98 where the individual element of MOTPER(N) is set equal to the present cycle, CYCLCNT, in block 98 thereby recording a time stamp of the detected motion.
  • the loop including block 97 is not exited unless a zero element is found in vector MOTPER(N), or unless the end of the vector is detected in decision block 99.
  • Control is then transferred to block 101 where counters Q and N are both set equal to "0" and another checking loop is entered.
  • counter N is incremented in block 102 and individual entries of vector MOTPER(N) are interrogated by decision block 103. If any entry is greater than 0, counter Q is incremented by 1 in block 104. The loop is retraced until the end of vector MOTPER(N) is detected in decision block 106. Thus, counter Q is set equal to the number of non-zero entries in motion vector MOTPER(N).
  • Control is then transferred to decision block 107 where it is determined if counter Q is greater than parameter K4. If so, control is transferred to block 108 where variable ALARM is set equal to "4" and the alarm is sounded in block 109. In other words, the alarm is sounded if counter Q indicates that there has been a number of unstable episodes greater than parameter K4 during a period set by parameter K5. This ends the periodic unstable episode detection portion of the routine.
  • Block 111 begins a routine which detects the number of product units removed during a time period set by parameter K5.
  • counter N is incremented and a loop is started in which the individual entries of counter vector CNTREM(N) that are greater than counter OLDCYCL (as determined by decision block 113), are set equal to 0 in block 114.
  • Count vector CNTREM(N) similar in format to motion vector MOTPER(N), is a time stamp vector in which the individual entries record the cycle number when each product unit was removed. The loop is retraced until all entries of vector CNTREM(N) have been interrogated as determined by decision block 116. After this loop, all entries of counter vector CNTREM(N) will be set to 0 if the counts are equal to counter OLDCYCL (i.e., older than time period K5).
  • decision block 117 it is determined if any product units have been removed by interrogation of counter CNTREM. If not, no further action is taken and control is transferred to block 118 (Fig. 4D). If true, control is transferred to block 119 where counter N is set equal to "0" and a loop is begun with block 121 where counter N is incremented.
  • count vector CNTREM(N) is interrogated for 0 entries in block 122, and counter CNTREM is compared with "0". If a zero entry is detected and if CNTREM is greater than zero, control is transferred to block 123 where the vector entry detected as 0 in block 122 is set equal to counter CYCLCNT, and counter CNTREM is decremented by 1.
  • the interrogation loop is continued until decision block 124 determines that the last entry in count vector CNTREM(N) has been interrogated.
  • time stamps equal to the present cycle count are entered into vector CNTREM(N) for each product unit removed. It should be noted that if more than one product unit is detected as being removed during a single cycle, several of the entries in count vector CNTREM(N) will have the same value.
  • Control is then transferred to block 126 where counter Q and N are both reset.
  • counter N is incremented and a loop is begun wherein the individual entries of counter vector CNTREM(N) are interrogated in decision block 128.
  • counter Q is incremented by 1 in block 129. The loop is retraced until decision block 131 determines that each element of vector CNTREM(N) has been interrogated. As a result of this loop, counter Q indicates the number of non-zero entries in count vector CNTREM(N).
  • decision block 132 counter Q is compared with parameter K3 to determine if the periodic unit removal limit has been exceeded. If so, variable ALARM is set equal to "3" in block 133 and the alarm is sounded in block 134. Control is then transferred to block 118 where the flag MOTFLAG2 is updated as are weight readings WTRDG3 and WTRDG2. Control is then transferred back to block 136 (Fig. 4A) where the loop is once again begun.
  • Next decision blocks 137, 139 and 140 are used to detect the position of key-lock switch 50 (Fig. 3). If key-lock switch 50 is in the lock-up mode (or if switch 53 has placed key-lock switch 50 in the lock-up mode), block 137 directs control to block 138 where appropriate parameters are minimized in order to place the rack at its highest theft prevention sensitivity. Control is then transferred to block 59 where the entire loop is retraced.
  • control is transferred to block 138 where normal mode is detected. If key lock switch 50 is in the normal mode position, control is transferred to block 59, and the loop is retraced.
  • block 139 decides key lock switch 50 is not in the normal mode, control is transferred to decision block 140 where, if key lock switch 50 is in the restock mode, block 136 is again reentered without retracing the main loop. Otherwise, the main loop is retraced by entering block 59.
  • variable ALARM is equal to "3" or "4". If not, control is transferred immediately to block 146. If so, counter N is reset in block 142, and a loop comprising blocks 143-145 is traversed a sufficient number of times to reset all entries of vectors CNTREM(N) and MOTPER(N). Then the alarm is sounded in block 146.
  • switches S2-2 and S2-3 are positioned by the user of the system as shown in Table VI to accommodate the number of weight transducers in the rack in use.
  • Parameter K1 the instantaneous removal limit, is set by positioning switches S1-1, S1-2 and S1-3 as shown in Table II, and is variable from 1 to 8 product units.
  • Switches S1-4, S1-5 and S1-6 are used to set the number of product units which must be removed over a time period to cause an alarm. This is called the periodic removal limit, K3, and is adjustable from 3 to 10 product units as shown in Table IV.
  • the time period, K5, for the periodic removal limit is set by positioning switches S2-4, S2-5 and S2-6, as shown in Table V.
  • an alarm will sound if the display rack is disturbed continuously for a number of cycles settable by switch S1-8 (parameter K2) as shown in Table III.
  • rack tampering or "swapping" of other merchandise for product units contained in the rack is detected if five unstable episodes (parameter K4) occur within the time period set by parameter K5.
  • the product rack will acknowledge removal of product units (when not in excess of an alarm limit) by an adjustable local tone or synthesized voice which can be set to zero volume.
  • the separately adjustable local alarm tone can also be set to zero volume if local alarm is not desired.
  • the alarm signal can be transmitted to a remote receiver, over wire or radio link, which will sound an alarm at a remote location.
  • the local tones are both adjustable in volume, tone and duration.
  • the predicted false alarm rate is the number of false alarms which would occur during 200 such peak hours.
  • odd numbered settings for the product unit alarm limit permit more restrictive settings without significantly higher incidence of false alarms.
  • time period and alarm limit settings are restricted to the lowest values which do not cause intolerable false alarm activity, the maximum protection against shoplifting is afforded. While theft of very few product units over an extended period of time may go undetected because this mimics plausible normal activity, the monetary loss of this type of theft is minimal.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Display Racks (AREA)
  • Audible And Visible Signals (AREA)
  • Confectionery (AREA)
EP19870305259 1986-06-13 1987-06-12 Anti-theft apparatus and method Expired - Lifetime EP0249501B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87305259T ATE61678T1 (de) 1986-06-13 1987-06-12 Anti-diebstahl vorrichtung und verfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US87415986A 1986-06-13 1986-06-13
US874159 1986-06-13

Publications (3)

Publication Number Publication Date
EP0249501A2 EP0249501A2 (en) 1987-12-16
EP0249501A3 EP0249501A3 (en) 1988-10-05
EP0249501B1 true EP0249501B1 (en) 1991-03-13

Family

ID=25363109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870305259 Expired - Lifetime EP0249501B1 (en) 1986-06-13 1987-06-12 Anti-theft apparatus and method

Country Status (10)

Country Link
EP (1) EP0249501B1 (xx)
JP (1) JPS6324491A (xx)
KR (1) KR880000056A (xx)
AT (1) ATE61678T1 (xx)
AU (1) AU596189B2 (xx)
BR (1) BR8703016A (xx)
CA (1) CA1272266A (xx)
DE (1) DE3768558D1 (xx)
ES (1) ES2021041B3 (xx)
ZA (1) ZA874217B (xx)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5000274A (en) * 1989-01-19 1991-03-19 K-Tron International, Inc. Weight sensor
GB8925452D0 (en) * 1989-11-10 1989-12-28 Transalarm Ltd A load security system
JP2010097456A (ja) * 2008-10-17 2010-04-30 Okamura Corp 商品陳列装置
JP2010097458A (ja) * 2008-10-17 2010-04-30 Okamura Corp 商品陳列装置
JP2010094332A (ja) * 2008-10-17 2010-04-30 Okamura Corp 商品陳列装置
JP2010097457A (ja) * 2008-10-17 2010-04-30 Okamura Corp 商品陳列装置
JP5444792B2 (ja) * 2009-03-31 2014-03-19 大日本印刷株式会社 盗難警報システム及び方法
GB2483096A (en) * 2010-08-27 2012-02-29 Tag Company Uk Ltd System for detecting theft and/or unauthorised removal of items from storage shelves
KR101363101B1 (ko) * 2012-06-13 2014-02-13 이정윤 디스플레이 테이블
JP2019064646A (ja) * 2017-09-29 2019-04-25 日立オートモティブシステムズメジャメント株式会社 液体供給システム
CN110147723B (zh) * 2019-04-11 2022-08-19 苏宁云计算有限公司 一种无人店中顾客异常行为的处理方法及系统
JP7424764B2 (ja) * 2019-06-28 2024-01-30 株式会社野村総合研究所 盗難抑止装置
DE102019121704A1 (de) * 2019-08-12 2021-02-18 ADECK Systems GmbH Verfahren, auswerteeinrichtung, darbietungseinrichtung, darbietungsvorrichtung, computerprogrammprodukt und speichermedium zum automatisierten erkennen von ladendiebstahl
GB202103826D0 (en) * 2021-03-19 2021-05-05 Swing Fitness Ltd Exercise apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1267630A (en) * 1969-05-16 1972-03-22 Fmc Corp Automatic marketing system
US4108363A (en) * 1975-06-25 1978-08-22 Iida Susumu Record controlled mechanical store
JPS5832430B2 (ja) * 1979-05-07 1983-07-13 シャープ株式会社 電子式キヤツシユレジスタ
US4512428A (en) * 1983-05-05 1985-04-23 K-Tron International, Inc. Weighing apparatus and method
JPH0719907B2 (ja) * 1985-07-03 1995-03-06 株式会社日立製作所 薄膜半導体装置の製造方法

Also Published As

Publication number Publication date
ZA874217B (en) 1988-03-30
AU596189B2 (en) 1990-04-26
CA1272266A (en) 1990-07-31
EP0249501A3 (en) 1988-10-05
JPS6324491A (ja) 1988-02-01
ATE61678T1 (de) 1991-03-15
EP0249501A2 (en) 1987-12-16
AU7418487A (en) 1987-12-17
DE3768558D1 (de) 1991-04-18
BR8703016A (pt) 1988-03-08
KR880000056A (ko) 1988-03-23
ES2021041B3 (es) 1991-10-16

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