Abstract:
A portable, hand-held terminal processes products selected by a customer. A database of a host computer stores attribute data, such as price, of many products. The database is accessed by wireless transmission on a real-time basis to automatically retrieve the stored product attribute data. The retrieved data is printed by a printer and/or displayed on a display associated with the terminal.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 08/679,310, filed Jul. 12, 1996 now abandoned, which, in turn, is a division of U.S. patent application Ser. No. 08/400,840, filed Mar. 8, 1995, which, in turn, is a continuation of U.S. patent application Ser. No. 08/292,584, filed Aug. 18, 1994, which, in turn, is a continuation-in-part of U.S. patent application Ser. No. 07/921,414, filed Jul. 27, 1992, now abandoned, which, in turn, is a continuation of U.S. patent application Ser. No. 07/553,559, filed Jul. 16, 1990, now abandoned, which, in turn, is a continuation-in-part of U.S. patent application Ser. No. 07/392,207, filed Aug. 10, 1989 now abandoned, which, in turn, is a continuation-in-part of U.S. patent application Ser. No. 07/138,563, filed Dec. 28, 1987, now U.S. Pat. No. 4,871,904. This application is related to U.S. patent application Ser. No. 07/966,906, filed Oct. 22, 1992, now abandoned, which is a continuation of U.S. patent application Ser. No. 07/553,558, filed Jul. 16, 1990, now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention generally relates to a portable terminal having real-time database access for printing and/or displaying retrieved data, especially data concerning objects at a point of transaction site. 
     2. Description of Related Art 
     Targets having indicia of different light reflectivity, such as bar code symbols printed on labels affixed to products, have been electro-optically scanned by directing laser beams to symbols for reflection therefrom. A portion of the reflected laser beam for each symbol was collected by a photodetector having a finite field of view. Each symbol and/or the field of view was scanned by different scan patterns including, but not limited to, a single scan line, a set of generally parallel scan lines, two sets of intersecting parallel scan lines, multiple intersecting scan lines, Lissajous scan patterns, holographic scan patterns, omnidirectional scan patterns, etc. 
     POS scanners and readers of this general type for electro-optically reading symbols have been disclosed, for example, in U.S. Pat. Nos. 4,251,798; 4,360,798; 4,369,361; 4,387,297; 4,593,186; 4,496,831; 4,409,470; 4,460,120; 4,607,156; 4,673,805; 4,736,095; 4,758,717; 4,760,248; 4,806,742; 4,808,804; 4,825,057; 4,816,661; 4,816,660; 4,845,350; 4,835,374; 4,871,904; D-306,434; D-306,435; as well as pending applications Ser. Nos. 193,265; 265,143; 265,548; 265,149; 264,693; 367,335; 367,007; 429,198; 392,207; and 349,860, all of the aforementioned patents and patent applications having been assigned to the same assignee as the instant application, and being hereby incorporated herein by reference. 
     Once a product having a symbol-bearing label has been scanned and identified, information such as price relating to the identified product is retrieved from a data base of a host computer. This information is then used, for example, at a supermarket checkout counter to indicate the price of the identified product to a customer. 
     Although generally satisfactory for its intended purpose, some customers wish to know the price of a product before standing in line at the checkout counter. To assist the customer, some stores post price signs in the vicinity of the products for sale on supermarket shelves. However, those signs are sometimes removed and not replaced on the shelves. More often, the price information is outdated from one day to the next due to price increases or special promotion sales. The only reliable price information is obtained typically only at the checkout counter and, as previously noted, many customers would like to know the price beforehand. 
     For certain items, for example, meats, fish, vegetables, fruits, etc., whose actual price is a function of weight, the only scale which is determinative of the actual price is the one at the checkout counter. Other in-store scales typically provide guidance only as to the approximate weight of the products. Here, again, it would be desirable for the customer to know the price of the products to be purchased before checking out. 
     Expediting checkout is also desirable in crowded supermarkets. The aforementioned items that have to be weighed at the checkout counter slow the checkout procedure. It would be desirable to apply machine-readable coded labels to such items in advance of checkout so that they may be automatically read at checkout. Supermarkets often have separate in-store specialty counters, e.g. an appetizing counter, where foodstuffs are weighed and labeled with a price dependent on weight. The foodstuff is identified by manual entry of a numerical code at a keyboard. Such manual entry is prone to human error, with the result that the wrong code and foodstuff is identified. 
     SUMMARY OF THE INVENTION 
     1. Objects of the Invention 
     It is a general object of this invention to advance the state of the art of such scanners. 
     It is another object of this invention to update inventory markings on a real-time basis. 
     Another object of this invention is to print updated product labels when information relating to the product has been updated. 
     A further object of this invention is to print individual updated product labels for application to each product. 
     Still another object of this invention is to advise a customer of the price of a product prior to checkout. 
     Yet another object of this invention is to reliably apprise a customer of the actual price of a product whose price is a function of weight prior to checkout. 
     Another object of this invention is to expedite the checkout procedure by automatically reading coded labels of products whose price is dependent on weight. 
     2. Features of the Invention 
     In keeping with these objects, and others which will become apparent hereinafter, one feature of this invention resides, briefly stated, in a method of and an arrangement for updating inventory markings. The invention includes storing information relating to inventory products in a data base of a host computer, and periodically updating such information relating to the products as circumstances, e.g. price increases or decreases, warrant. Each of the products is identified by electro-optically reading indicia thereon having parts of different light reflectivity. In a preferred embodiment, the indicia are bar code symbols printed on labels affixed to the products. 
     Each time a product has been identified, the host computer is interrogated on a real-time basis for the updated information. If updated information is available, an updated label is printed, the updated label containing the updated information in human-readable and/or machine-readable form. The updated label is thereupon applied to the identified product. 
     Thus, when the information relating to the products is price information, the customer is reliably apprised of the actual price of the item prior to checkout. No longer need the customer be faced with missing price signs. in the case where the price information includes price per unit weight data, this invention further contemplates weighing the identified product prior to interrogating the host computer. Thus, the updated label is printed with the weight and price information for application to the identified product prior to checkout. 
     The electro-optical reading of the symbol is preferably performed by a hand-held head supported by a retail clerk, and aimable at each symbol during reading. Within the head are mounted means for directing a light beam, preferably a laser beam, to the symbol, means for detecting at least a portion of light of variable intensity reflected off each symbol over a field of view, means for scanning at least one of said laser beam and said field of view, and means for processing electrical signals indicative of the detected light intensity into data identifying the product bearing the symbol. 
     Rather than a hand-held head, all of the aforementioned means can be incorporated in a head of a desktop, stand-alone workstation. The head may be connected, in a preferred embodiment, to one end of an arm that is bendable in order to position the head in a desired orientation. 
     The printing of the updated label may be performed by a printer on-board the head, or located remotely therefrom, e.g. a portable printer either held separately by the clerk or supported on a belt or shoulder strap worn by the clerk. 
     In a preferred embodiment, the printer is a thermal printer that is powered by a re-usable, rechargeable battery. The printer advantageously prints on leading portions of a paper roll of tear-off labels not only the aforementioned price information, but also sequence numbers indicative of the number of times that the printer has printed labels—a feature useful in preventing pilferage. 
     The electro-optical reading of a bar code symbol uniquely associated with each product insures that incorrect product identification by manual entry of an incorrect numerical code at a keyboard is reliably prevented. 
    
    
     The novel features which are considered as characteristic of the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings. 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a sectional view of a hand-held head together with a host computer for use in the present invention; 
     FIG. 2 is a perspective view of the arrangement of FIG. 1 in use; 
     FIG. 3 is a diagrammatic side view of another arrangement for updating inventory markings according to this invention; 
     FIG. 4 is a diagrammatic side view of yet another arrangement for updating inventory markings according to this invention; 
     FIG. 5 is a diagrammatic side view of an additional arrangement for updating inventory markings according to this invention; 
     FIG. 6 is a diagrammatic side view of a further arrangement for updating inventory markings according to this invention; 
     FIG. 7 is a perspective view of a combination scale and printer for use with this invention; 
     FIG. 8 is a block diagram showing a host computer serving multiple scanning workstations; and 
     FIG. 9 is a front perspective view of an arrangement according to this invention in use at a retail point-of-sale location. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to FIG. 1 of the drawings, reference numeral  10  generally identifies a lightweight (less than 1 lb.), narrow-bodied, streamlined, hand-held, fully-portable, easy-to-manipulate, non-arm-and wrist-fatiguing, scanning head supportable entirely by an operator for use in a scanning system operative for reading, scanning and/or analyzing symbols, and aimable, both prior to and during reading thereof, by the operator at the symbol, each symbol in its turn. The term “symbol” as used herein is intended to cover indicia composed of parts having different light-reflective properties. The indicia may be industrial symbols, e.g. Code 30, Codabar, Interleaved 2 or 5, etc., or the omnipresent Universal Product Code (UPC) bar code symbol. The indicia may also be composed of alphabetic and/or numeric characters. 
     The head  10  includes a generally gun-shaped housing having a handle portion  12  of generally rectangular cross-section, and a generally horizontally-elongated, narrow-bodied barrel or body portion  14 . The dimensions and overall size of the handle portion  12  are such that the head  10  can conveniently fit and be held in the operator&#39;s hand. The body and handle portions are constituted of a lightweight, resilient, shock-resistant, self-supporting material such as a synthetic plastic material. The plastic housing is preferably injection-molded and forms a thin, hollow shell whose interior space measures less than a volume on the order of 50 cu.in. 
     As considered in an intended position of use, as shown in FIG. 2, the body portion  14  has a front wall  16 , a rear wall  18  spaced rearwardly of the front wall, a top wall  20 , a bottom wall  22  below the top wall, and a pair of opposed side walls  24 ,  26  that lie in mutual parallelism between the top and bottom walls. 
     A manually-actuatable, and preferably depressible, trigger  28  is mounted for pivoting movement about a pivot axis on the head in a forwardly-facing region where the handle and body portions meet and where the operator&#39;s forefinger normally lies when the operator grips the handle portion in the intended position of use. 
     A plurality of components are mounted in the head and, as explained below, at least some of them are actuated by the trigger  28 , either directly or indirectly, by means of a control microprocessor  30 . One of the head components is an actuatable light source, e.g. a semiconductor laser diode  32  or a light emitting diode, operative, when actuated by the trigger  28 , for propagating and generating an incident light beam. In the case of a laser, the light beam is highly divergent, is non-radially symmetrical, is generally oval in cros-ssection, and has a wavelength above 7000 Angstrom units. The laser diode  32  may be of the continuous wave or pulse type. The diode  32  requires a low voltage, e.g. 12 volts DC or less, supplied by a battery  34  which may be provided within the handle portion  12  or by a rechargeable battery pack accessory detachably mounted on the head, or by a power conductor in a cable connected to the head from an external power supply. 
     An optical assembly, including a half-silvered mirror  37  and an optical train  38 , is mounted in the head, and is adjustably positioned relative to the diode  32  for optically modifying and directing the incident laser beam along a first optical path toward a reference plane which is located exteriorly of the head forwardly of the front wall  16  and which lies generally perpendicular to the longitudional direction along which the incident laser beam propagates. A symbol to be read is located at the vicinity of the reference plane, either at, or at one side, or at an opposite side,of the reference plane, that is, anywhere within the depth of focus or field of the optically-modified incident laser beam. The depth of focus or field is also known as the working distance in which the symbols can be read. The incident laser beam reflects off each symbol in many directions, and that portion of the reflected laser light which travels away from the symbol back toward the head is known herein as the returning portion. 
     The laser beam passing through the optical train  38  impinges on a generally planar portion of a scanning mirror  40  for reflection therefrom. The scanning mirror  40  forwardly reflects the laser beam impinging thereon in the direction of an arrow  42  through a forwardly-facing light-transmissive window  44  mounted on the front wall  16  and to the symbol. 
     The scanning mirror  40  is mounted on a scanning component, preferably a high-speed scanner motor  46  of the type shown and described in U.S. Pat. No. 4,387,397, the entire contents of which are incorporated herein by reference. For purposes of this application, it is sufficient to point out that the motor  46  has an output shaft on which a support bracket is fixedly mounted. The scanning mirror  40  is fixedly mounted on the bracket and is driven in alternate circumferential directions over arc lengths of any desired size, typically less than 360°, and at a rate of speed on the order of a plurality of oscillations per second. In a preferred embodiment, the scanning mirror  40  and the shaft are reciprocally and repetitively oscillated so that the scanning mirror repetitively sweeps the incident laser beam impinging on the mirror through an angular distance or arc length at the reference plane of about 32° and at a rate of about 20 scans or 40 oscillations per second. 
     The returning portion of the reflected laser light has a variable light intensity due to the different light-reflective properties of the various parts that comprise the symbol over the symbol during the scan. The returning portion of the reflected laser light is collected in the direction of arrow  48  by a generally concave spherical portion of the mirror  40 . The generally planar mirror portion is integrally attached to the generally spherical mirror portion of the mirror  40 . The spherical portion reflects the collected light through the optical train  38 , the half-silvered mirror  37 , and to a sensor means, e.g. a photosensor  50 . The photosensor  50 , preferably a photodiode, detects the variable intensity of the collected laser light over a field of view which extends along, and preferably beyond, the scan, and generates an electrical analog signal indicative of the detected variable light intensity. 
     Also mounted in the head is signal processing means  52  mounted on a circuit board  54 , and operative for processing the analog electrical signal generated by the photodiode  50  into a digitized video signal. Data descriptive of the symbol can be derived from the video signal. Suitable signal processing circuitry for this purpose was described in U.S. Pat. No. 4,251,798. Other components within the head include drive circuitry for the motor  46 , an aiming light controller in the event that the laser diode  32  generates a laser beam which is not readily visible to the human eye, and a voltage converter for converting incoming voltage, e.g. from the battery  34 , to a regulated voltage suitable for energizing the laser diode  32 . 
     Also mounted on the circuit board  54  is a decode/control means  56  operative for decoding the digitized video signal to a digitized decoded signal from which the desired data descriptive of the symbol is obtained in accordance with an algorithm contained in a software control program in the microprocessor  30 . The decode/control means includes a PROM for holding the control program, and an RAM for temporary data storage. The decode/control means  56 , together with the microprocessor, determine when a successful decoding of the symbol has been obtained, and also terminates the reading of the symbol upon the determination of the successful decoding thereof. The initiation of the reading is caused by depression of the trigger  28 . The decode/control means also includes control circuitry for controlling the actuation of the actuatable components in the head, namely, the laser diode  32 , the photodiode  50 , the motor  46 , and all the other electronic subcircuits therein, as initiated by the trigger, as well as for communicating with the user that the reading has been automatically terminated as, for example, by sending a control signal to an indicator lamp  58  to illuminate the same or by energizing a buzzer or beeper. 
     The decoded signal is either conducted along a conductor within a cable interconnected between the head and a remote host computer  60 , or is transmitted by radio wave from the head to the computer  60  by means of antenna  36 . The computer  60  serves essentially as a large data base, may be an in-store processor, stores the decoded signal, and provides information related to the decoded signal. For example, the host computer, in accordance with this invention, can provide retail price information on an updated basis corresponding to the products identified by their decoded symbols. The host computer can advantageously be incorporated in a portable terminal, or in a stationary terminal such as a cash register. 
     A keyboard  62  may advantageously be provided on the head for entering data relating to the symbol and/or the product bearing the same. A display  64  is also conveniently mounted adjacent the keyboard  62  on the top wall  20  or the head, and is operative for displaying information relating to the symbol and/or the product bearing the same. 
     As described so far, each product bearing a label imprinted with a symbol is identified by scanning the symbol with the hand-held scanner head  10  in the manner depicted in FIG.  2 . Information such as price is retrieved on a real-time basis from the data base of the host computer  60 . The stored information is periodically updated, for example, by keyboard entry, to reflect price increases or decreases. The data base can be incorporated in a portable housing held in one&#39;s other hand, or supported on the operator&#39;s person, for example, suspended from a belt or shoulder strap, in a field-portable application. 
     In the event that the information stored in the data base has been updated, this invention proposes printing an updated label with machine-readable and/or human-readable data reflecting the updated information. The printing is performed by a printer  62  that is either incorporated in the hand-held head  10  (see FIG. 1) or held in one&#39;s other hand, or worn on one&#39;s person (see FIG.  2 ), or mounted on a near-by support surface such as a countertop, or incorporated in another component such as a scale or cash register, as described below. The printer includes a thermal printhead  61  operative for thermally imprinting graphical markings on a journaled roll  63  of paper labels, each printed label being torn off the roll by being urged against tear-off edge  65  at the front of the head  10 . The updated label preferably has a pressure-adhesive backing so that it can be applied directly on the product, either adjacent to, or preferably as an overlay to, the existing label on the product. 
     Turning now to FIG. 3, most or all of the components shown within the hand-held head  10  of FIG. 1 can be mounted within a workstation  100  having a head  102 , a base  104  supported on a countertop or like support surface  106 , and an adjustable gooseneck-like conduit or arm  108 , one end of which is connected to the head  102 , and the opposite end of which is connected to the base  104 . The trigger  28  can be eliminated. The arm  108  is hollow so that electrical wires can be routed therethrough to conduct electrical signals to and away from the components within the head  102 . The arm is constituted of a semi-rigid, metal material capable of being repeatedly manually bent to a selected orientation and, when so bent, capable of staying in said selected orientation until re-bent by an operator to another orientation. By bending the arm, the head  102  is infinitely adjustably positioned relative to a symbol located in the vicinity of a work surface exteriorly of the scanner. The work surface or reference plane can be located at, or slightly above, the plane of the countertop  106 , or can be located at, or slightly above, the plane of the upper surface of the base  104 . 
     An electrical cable  110  connects the workstation to a terminal  112  which is shown, for convenience, as a cash register in a POS installation. The terminal  112  has a display  114  for displaying information, including data descriptive of the symbol being scanned, to an operator; a keyboard  116  for enabling the operator to manually enter information, including data descriptive of the symbol being scanned; a cash drawer  118  for holding money; a paper tape  120  for recording information and providing a receipt to a customer of the purchase of an object bearing the symbol being scanned; a recharger  122  for recharging and supplying electrical power to a battery mounted either within the base  104  or the head  102 ; a decode module  124  (in case the decode module is not located within the base  104 , arm  108 , or head  102 ); and a data base  126  of a host computer. A connector  128  can be used to download the stored data to another data base. 
     The entire installation shown in FIG. 3 is known as an intelligent terminal. The arm  108  can be manipulated with multiple degrees of freedom of movement to insure that the exiting laser beam (depicted by the arrow  130 ) strikes the symbol and/or the returning reflected light is collected from the symbol. 
     The laser scanning head  100  of FIG. 3 is of the retro-reflective type wherein the outgoing incident laser beam, as well as the field of view of the sensor means, are scanned. It will be readily understood that other variants also are within the spirit of this invention. For example, the outgoing incident laser beam can be directed to, and swept across, the symbol through one window on the head, while the field of view is not scanned and the returning laser light is collected through another window on the head. Also, the outgoing incident beam can be directed to, but not swept across, the symbol, while the field of view is scanned. 
     The printer  62  can be incorporated within the head. As shown in FIG. 3, the printer  62  is situated within a downward handle-like extension of the head. Any components previously mounted within the handle can be moved, for example, to the base  104  or the terminal  112 . 
     A weighing scale  132  is incorporated within the base  104 , and is operative for weighing a product placed on a weighing platform. In a preferred application, a product such as meat or fish, whose price is a function of weight, is placed on the platform and weighed. The head  102  identifies the product as being meat, fish, etc., by a symbol-bearing label. The data base  124  identifies the price per lb. of the identified product. The price is calculated by the system microprocessor. The printer  62  prints the name of the product, the price, the price per lb., etc., in alpha-numeric and/or machine-readable indicia, on an updated label which is then applied to the product over the original label. All of the above can be performed at a separate meat or fish counter in a supermarket, which counter is preferably remote from the checkout counter. The consumer thus knows the actual price of the product prior to reaching the checkout counter. At the checkout counter, the retail clerk need only scan the updated label with an electro-optical scanner, as described above, to complete the purchase of the product and expedite the checkout procedure (see FIG.  9 ). 
     Turning now to the so-called “zero footprint” embodiment of FIG. 4, most or all of the components within the hand-held head of FIG. 1 can be mounted within a lamp-like workstation  200  having a bendable arm  202  and a head  204  in which the printer  62  is mounted. The workstation is anchored to the support surface  106 . The head can communicate with the terminal  112 , for example, by radio wave communication, via antennae  206 ,  208 . The workstation  200  can scan bulky or small objects, such as delicatessen sandwich  210 , and its slim, compact design clears valuable point-of-sale counter space, leaving more room for customers to put down their purchases and giving employees more room to work. 
     In the embodiment of FIG. 5, the bendable arm  108  and the head  102 , including the printer  62 , are neither anchored to the base  104  nor the support surface  106 , but, instead, are directly connected to the cash register terminal  112 . The scale  132  is mounted separately on the countertop  106 . 
     As described in the embodiments of FIGS. 3-5, the bendable arm  108 ,  202  enables the operator to specifically position the scanner head over the working surface so that the distance between the head and the products bearing the symbols to be scanned may be optimally adjusted. In practice, the operator will pass the articles bearing symbols to be scanned in a fairly rapid manner under the scanning head. The head will emit a laser beam scan pattern which covers the entire portion of the working surface so that the operator need not repetitively pass the article over a specific area such as an X-shaped slot formed in a countertop. Known slot-type scanners often require multiple passes of the article and symbol over a countertop slot in order to achieve an accurate registration of the symbol with respect to the scan pattern. Since the scan pattern in the present invention is, advantageously, a multi-directional pattern of the type described in U.S. Ser. No. 392,207, filed Aug. 10, 1989, there is a much higher probability that one of the scan lines will extend across the symbol regardless of the orientation of the article on the working surface. 
     Another feature of the present invention is known as the automatic object sensing feature. Since the scanner workstation of FIGS. 3-5, is intended to operate in a hands-free mode, it is important in the design of the present invention that the scanning take place continuously. When a bar code symbol is detected in the workstation, typically by interruption of an infrared beam, and correctly decoded, the data representative of the symbol is automatically entered into the POS terminal, and an indicator alerts the operator that a successful read has occurred. Although the scan lines will still continue to scan the bar code symbol on the article while the article is in the workstation, an inhibiting signal is generated after a successful read to prevent the same symbol from being read a multiple number of times. 
     Turning now to FIG. 6, a hand-held head  150  having an on-board printer  62 , and actuatable, just like head  10 , by a trigger  28 , is connected via a cable  152  to the cash register terminal  112 . The head  150  may be held in one&#39;s hand and/or mounted in a stand  154  resting on the tabletop  106 , or may be mounted, at least temporarily, in a cradle  156  extending outwardly from the side of the terminal  112 . The scale  132  is positioned near-by on the support surface  106 . 
     Rather than providing the scale  132  as a separate unit, or incorporating the printer  62  within a workstation head or a hand-held head, the scale and the printer may be combined in an integrated housing as shown in FIG.  7 . The scale/printer combination  160  includes a weighing platform  162 , a keyboard  164 , a display  166 , and a slot  168  through which updated labels  170  issue. An internal printing mechanism, which is driven preferably by a bar code symbol input, prints the data  172  on each label  170 . The data may be encoded as a one-dimensional bar code symbol, e.g. a UPC symbol, or as a two-dimensional or multi-track bar code symbol as shown for label  170 . Reference may be had to U.S. Pat. No. 4,794,239 for details of multi-track bar code symbols used for greater spatial efficiency. 
     The data  172  may be just price-related information, or, as shown for label  174 , may include additional coded information  176 , such as a sequence number, indicative of the cumulative number of times that the printer has printed a label. Thus, the total number of labels printed can be tracked to assist in preventing pilferage. 
     Each head or workstation described herein is preferably operative in three modes or operational states. The first, or so-called “sleep” mode, is an inactive state. The second, or so-called “aiming” mode, emits a pointing or aiming light beam to assist the operator in correctly orienting the product label. The aiming light beam can be a circular or elliptical beam spot, or a short linear sweep on the symbol. The third, or so-called “scanning” mode, emits a light beam which scans and reads the entire symbol. 
     As shown in FIG. 8, the host computer  60  can serve multiple heads or workstations such as workstations  200 . Each workstation is independently operable to scan a product label, print an updated label, and enable an operator to apply the printed label on a product in a so-called “scan-print-apply” operation. 
     It is further advantageous if the aforementioned decode/control means  56 , as well as all the other components in the head or workstation, are mounted on a single circuit board such as board  54 . A number of things then become possible that are advantageous both during manufacturing and in use in the field. For example, the microprocessor  30  can control functions that otherwise might not be possible, or might require expensive hardware. 
     During manufacture of the head or workstation, for example, the microprocessor  30  could control such things as motor scan amplitude (or scan speed) and laser power. This would permit automatic adjustment of these settings to the proper levels, when placed in a fixture that can provide feedback to the scanner so that it will know when the settings are correct. This eliminates expensive and time-consuming human labor, and increases product reliability and consistency by eliminating human error. 
     With the microprocessor in control, scanning performance can be improved. Such things as gain of the analog amplifiers,motor speed, and digitizing thresholds can be varied by the microprocessor to help decode difficult-to-read symbols. 
     Some of these things can be varied with the decode/control means remote from the scanner, but it will increase the number of interconnections between the scanner and decode/control means which increases size and cost of interconnecting cables and connectors. 
     Other adjustments, such as laser power or motor speed, which are automatically set during manufacturing, require that the decode/control means and scanner be on one board, as the decoder will have learned the proper settings for its particular scanner, and so must never be connected to another scanner. 
     The decode/control means can control such functions by using digital-to-analog converters, digitally-controlled potentiometers or attenuators, analog switches, or whatever is appropriate for the function being controlled. Proper settings that are determined during manufacturing can be stored in non-volatile memory in the microprocessor so they can be restored each time the scanner is powered up. 
     Turning now to FIG. 9, a point-of-sale counter  220 , such as an appetizing counter, has a plurality of appetizing products such as fish  222 , meat  224 , potato salad  226 , cheese  228 , salami  230 , just to mention a few exemplary choices. Each product is associated uniquely with a bar code symbol. For example, flags  232 ,  234 ,  236 ,  238 ,  240  bear unique coded symbols which, when electro-optically scanned, decoded and read, respectively identify the products  222 ,  224 ,  226 ,  228 ,  230 . 
     The counter  220  also includes a cash register  112  of the type shown, for example, in FIG.  4  and having an antenna  208 , as well as a combination scale/printer  160  of the type shown in FIG. 7. A clerk stands behind the counter  220  and holds a scanner  10  of the type shown in FIG.  1 . 
     In use, a customer walks up to the counter  220  and requests a portion  242  of a particular product, such as salami  230 . The clerk weighs the portion on scale  160  and aims the scanner  10  at the flag  240  to advise the system that the product being weighed is, in fact, salami. It is this optical identification of the product which prevents operator error as is common with manual entry of product identification codes in known systems. 
     With the product and its weight known, the price per unit weight information is determined, and a label such as label  170 ,  174  is printed, as described above. The label is applied to the salami portion  242 , typically on a paper wrapping therefor. 
     In a modification, the scanner  10  is provided with a slot  244  through which magnetically encoded credit cards are passed for the purpose of charging the customer&#39;s account, all at one location. 
     This invention is not intended to be limited to food counters, since any merchandise can be optically read in the manner described above. In a retail situation such as a clothing store, the scanner  10  could additionally be provided with a tag deactivator of the type described in Ser. No. 236,249, filed Aug. 25, 1988, now abandoned. 
     Inventory control is tightened with the arrangement described herein. Typically, the in-store processor (host computer) assigns a serial number to the product portion  242  being weighed. The processor then adds this information to the point-of-sale product file with the correct price. Once the product portion is scanned, the serial number is deleted from the product file. 
     It will be understood that each of the elements described above, or two or more together, also may find a useful application in other types of constructions differing from the types described above. 
     While the invention has been illustrated and described as embodied in an arrangement for and method of processing objects, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention. 
     Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims. 
     What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.