CA1183961A - Modular electronic measuring and printing unit - Google Patents
Modular electronic measuring and printing unitInfo
- Publication number
- CA1183961A CA1183961A CA000444793A CA444793A CA1183961A CA 1183961 A CA1183961 A CA 1183961A CA 000444793 A CA000444793 A CA 000444793A CA 444793 A CA444793 A CA 444793A CA 1183961 A CA1183961 A CA 1183961A
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- circuit board
- record medium
- printer
- assembly
- unit
- Prior art date
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Abstract
ABSTRACT OF THE DISCLOSURE
A compact, modular, electronic measuring unit constructed for enclosure within a small. portable housing having a removable front wall to provide access to the enclosure formed within the housing. A measuring and indicator circuit card is mounted within the enclosure adjacent the front wall while a power circuit card is mounted within the enclosure adjacent the rear wall thereof. Manual control units are mounted on the front wall of the housing and are removable therewith. A moving dot matrix printer is mounted within the housing and is connected to receive data from the measuring and indicator circuit. This printer is activated by one of the control units on the front wall of the housing, and includes a printer unit which is driven in a first plane during the printing of a character on a record medium and a record medium drive unit which drives a record medium in a second plane transverse to the first plane during the printing of a character.
A compact, modular, electronic measuring unit constructed for enclosure within a small. portable housing having a removable front wall to provide access to the enclosure formed within the housing. A measuring and indicator circuit card is mounted within the enclosure adjacent the front wall while a power circuit card is mounted within the enclosure adjacent the rear wall thereof. Manual control units are mounted on the front wall of the housing and are removable therewith. A moving dot matrix printer is mounted within the housing and is connected to receive data from the measuring and indicator circuit. This printer is activated by one of the control units on the front wall of the housing, and includes a printer unit which is driven in a first plane during the printing of a character on a record medium and a record medium drive unit which drives a record medium in a second plane transverse to the first plane during the printing of a character.
Description
TEC~ICAL FIELD
The present invention relates generally to electronic measuring units capable of providing a digital indication representative of a value to be measured while simultaneously providing a printed representation of such digital indication upon a record form.
BACKGROUND ART
Recent advances in electronic technology which have made available low cost but efficient microprocessor systems have led to the development of improved electronic measuring systems capable of providing a digital indication representative of a value to be measured. These microprocessor controlled systems, such as that disclosed by U.S. Patent No.
3,962,570 to Loshbough, provide automatic zeroing, zero set functions, tare control, and many other func~ions previously provided by much more complex logic circuits, such as tha~
disclosed by U.S. Patent No. 3,665,169 to Henderson et al.
Additionally, microprocessor measuring systems may be programmed to provide a number of calibLation functions and other program control functions which previously have been performed by excessively expensive, large and complex electronic units.
Although microprocessor technology has resulted in the ~tl~fJ~
development of electronic measuring systems having greatly enhanced capabilities, such systems are generally still of substantial size, expensive, and difficult to service. This is particularly true when the measuring system i5 combined with both a visual digital indicator and a printer assembly for providing a record printout of the visual display. Combined electronic measuring and printer systems, such as ~hose used for electronic weighing, are generally both large and complsx, as illustrated by U.S. Patent Nos. 3,623,119, to Orr and 3,701,991 to Livesey. Consequently, there is a demand for a small, compact, modular electronic measuring unit and printer system which may be operated from either a battery or a conventional power supply and which, although adapted to a wide variety of uses, may be easily and inexpensively serviced and repaired.
OBJ~CTS OF THE INVENTION
It is the primary object of the present invention to provide a low cost, compact, modular electronic measuring and printing unit which is of simple construction and which may be easily serviced in the field. This unit is constructed for enclosure within a ~mall, portable housing having at least one removable wall to provide access to the enclosure within the housing. The electronic system for the unit is modular with a power ~upply system being mounted upon a circuit card adjacent the rear of the housing and the electronic circuitry for -the mesuring unit being moun-ted with an indicator system therefor on a circuit card adjacent the front wall of the housing. The Eront wall of the housing încludes a window to facilitate visual observation of the indicator.
The present invention further provides a modular, portable electronic measuring unit mounted within a housing having a removable front wall section to provide access to the enclosure within the housing. The measuring system includes a power supply circuit provided upon a removable circuit card adjacent the rear of the housing and a measuring and indicator circuit provided upon a removable circuit card adjacent the front wall of the housing. The front wall of the housing carries mechanical control members removable with the front wall which cooperate with the measuring circuit card to control the operation of the measuring circuit when the front wall section is in place on the housing. This unit is designed to provide convenient access to the measuring circuit card so that simple calibration adjustment is facilitated.
Another aspect oE the present invention is to provide a novel and improved modular, portable electronic measuring unit and printer system which is conveniently mounted within a small portable compact housing. The power supply circuit for both the printer and the measuring system is mounted upon a single circuit card adjustment the rear wall of the housing, while the measuring circuit and control circuit for the printer P ~
system is mounted upon a single circuit card adjacent the front wall of the housiny. This front circuit card also bears an indicator unit Eor the measuring system which provides a visual indication through a window in the front wall of the housing.
Control actuators for both the measuring system and the printer are provided by elements mounted on the housing front wall and removab]e from the housing with the front wall.
It is another object of the present invention to provide a printer for use with an electronic measuriny system which operates to print alpha or numeric characters on a single or multiple copy pre-printed ticket form. The ticket form is inserted under a dot marker until a stop is engaged, wherein the ticket form will then be automatically fed out of ~he printer as printing occurs. The printer timing and printing lS are controlled by a microprocessor.
A further aspect of the present invention is to provide a printer for use with an electronic measuring system having a print unit which is mounted for movement in a first plane and a print drive assembly to selectively move the print unit between spaced points in the first plane. The print unit marks an adjacent record medium and a record medium drive unit is provided to move the record medium in a second plane transverse to the first plane.
~ further object of the presen-t invention is to provide a modular, electronic measuring and printiny unit wherein a sinyle microprocessor chip is employed to control analog to digital conversion, arithmetic and display functions as well as the operation of a printer unit.
A still further object of the invention is to provide a modular electronic measuring and printing unit wherein a printer is employed as the chasis for the electronic circuit boards for the system. Novel circuit board structures are provided with sensing units and other components positioned to cooperate with pcinter components, and ~hese circuit board structures are uniquely combined with the printer to form an operative module.
Additional objects, advantages and features of the invention will be more readily apparent from the following detailed description of a preferred embodiment of the invention when taken together with the accompanying drawings.
BRIEF DESCRIP'rION OF TH~ DRAWINGS
FIGURE 1 is a perspective view of the modular electronic measuring and printing unit of the present invention;
FIGURE 2 is a partially cut away side view of the modular electronic measuring and prin~ing unit of FIGURE 1 with the first and second sections of the housing assembly separated;
FIGURE 3 is a diagrammatic plan view of the interior of the electronic measuring and pri.nting unit of FIGURE 1;
FIGURE 4 is a block diagram o:E the power supply circuit and circuit for the electronic measuring and indicator sys-tem for the modular electronic measuring and printinq unit of FIGURE l;
FIGURE 5 is a block diagram of the elec-tronic circuit for the printer of FIGURE 3;
FIGURE 6 is an exploded view of the elec~ronic measuring and printing unit of the present invention; and FIGU~E 7 is an exploded section of the power circuit board of FIGURE 6 in combination with the detectors of FIGURE 5.
DETAILED D~SCRTPTION OF INVENTIO~
Referring now to FIGURES 1 to 3, the modular, portable, electronic measuring system and printing unit of the present invention indicated generally at 10 includes a housing 12 which is formed from a firs-t housing assembly 14 and a second housing assembly 16. The housing assembly 14 includes a top wall 18, a bottom wall 20, a rear wall ~2, and side walls 24 and 26, preferably formed as a unitary unit which deEi.nes an enclosure 23 having an open front side 30.
The second housing assembly 16 is adapted to be removably secured to the first housing assembly and operates to close the open front side 30 of the enclosure 28. This second housing assembly is formed by a top wall 3Z, a bottom wall 34, and side walls 36 and 38, all of which are connected together and substantially coextensive with the top, bottom and side walls of the f:irs-t housing assembly 1~ when the two housiny assemblies are connected together. The top, bottom, and side walls oE the second housing assembly provide a frame for a recessed face plate 40 which closes the open front side of the enclosure 28 when the second housing assembly 16 is secured to the first housing assembly 14. This may be accomplished by means of an indented, projecting Elange 42 which ex~ends from the front edge oE the top, bottom, and side walls of ~he first housing assembly 14 and which is adapted to slide within the open rear side of the second housing assambly 16 to engage the inner surface of the walls thereof.
The face plate 40 includes an elongated slot 4~ which receives a ticket or other record medium and a window 46 which is position to permit visual obsveration of a digital display indicator 48 mounted within the enclosure 28. Also mounted upon the face plate 40 are a print button 50, a zero button 5Z
and a power on/standby button 54 which cooperates with a power switch 55. These buttons may be depressed relative to the face plate 40, but are peLmanently mounted upon the face plate and are removable from the first housing assembly 14 with the second housing assembly 16.
FIGURE 3 provides a diagrammatic illustration of the arrangement of components within the enclosure 28. This arrangement is quite significant, for it not only contributes to the compactness of the uni-t lO, but also facilitates simple and economic maintenance. It will be noted from FIGURE 3, that a printer unit 56 is mounted within the enclosure so as to be in alignment with the slot 44 and operable by the print button 50. Also occupying the enclosure with the printer unit are a power supply circuit board 58 and a measuring and indicator circuit board 60. These two circui~ boards are mounted on the printer unit 56 to form a sub-assembly that is completely functional when removed from the enclosure 28 and which may be conveniently replaced as a single unit. I~ is importan~ to note that the power supply circuit board is positioned adjacent the rear wall 2Z of the enclosure while the measuring and indicator circuit board 60 is positioned adjacent the open front side 30 of the enclosure and thus adjacent to the faceplate 40. Since the measuring and indicator circuit board carries the measuring circuit, the microprocessor unit, calibration adjustments, and the indicator unit Eor the system, the position of this board makes calibration simpler.
Consequently, when the second housing assembly 16 is removed from the first housing assembly 14, the calibration controls and indicator are then readily accessible for convenient calibration.
With the power supply circuit board 58 arranged adjacent to the rear wall 22, convenient access for the input power line to the housing 12 is provided. This input power line will carry a power supply conductor 62 directly to the power supply circuit board 58; the shor-t path thereby minimi2ing possible interference cause by the power supply conductor. A measuring signal conductor 64, which provides an electrical signal from a suitable measuring ~ransducer to the measuring and indicator circuit board 60 may be routed through a separate entry for isolation from the power supply conductor. The conductor 64 might provide an eleetrical measurement signal from a load cell unit ~5 when the modular portable eleetronic measuring and printer unit 10 is employed for weighing applieations. The rearwar~ positioning of the power supply eircuit board 58 within the enclosure 28 provides convenient access to this board for the input power line 62 while also enabling this board to convenien~ly supply power to the printer 56 and the measuring and indicator circuit board 60. Also, since the power supply eircuit board reguires no adjustment, it need not be as accessible as the measuring and indicator circuit board 60.
With reference to FIGURE 4, it will be noted that the measuring and indicator eireuit board 60 reeeives the input measurement signal on the line 76~ at an analog input and adjust eireuit 66. This cireuit may eonstitute any input eireuit for providing low drit amplifieation while permitting some analog adjustments to the ineoming measurement signal.
For example, in an eleetronie weighing system, this adjustment eircuit might include the conventional operational amplifiers, eomparators, span adjust eireuitry, over capaeity adjust eireuitry, and dead load adjust circuitry. From the adjust eireuit 66, the adjusted measurement signal is fed to an analog to digital eontrol and conversion eireuit 68 where the input analog measurement signal is converted into a digital signal for processing in a microprocessor 70. The analog to diyi.tal control ancl conversion circuit contains the circuitry necessary to accomplish a digital conversion and is locked into ~he microprocessor clock to ensure synchroniza~ion.
An auto zero adjust circuit 72, which may be activated by the control button 52, is connected to the microprocessor 70 which provides conventional automatic zero tracking and push button zeroing of the system. The microprocessor then controls the digital display provided by the visual display unit 48.
To this point, ~he components of the electronic measuring and display system contained on the circuit board 60 perform a measurement and display function in a conventional manner which is well known in the prior art. However, the microprocessor 70 is also programmed to control the operation of the printer 56, and to accomplish this function, the microprocessor receives an input from a ticket insertion detector on an input line 74 and a second input from a synchronization detector on an input line 76. The microprocessor provides control signals to a print motor driver 78 and also to a print solenoid driver 80.
The power supply circuit board includes a power supply circuit 82 to provide power to both the components on the measuring and indicator circuit board 60 as well as to components for the printer 56. For example, ~he power supply circuit provides power on a ticket detector output line 84 and 3. ~ a~
also on a synchLonization detector output line 86.
Additionally, power is supplied to other miscellaneous components of the system on a miscellaneous line 88. For example, the line 8~ could provide power to an optional heater for the modular electronic measur:ing and printing unit 10.
The control circuit for the printer 56 may best be understood with reference ~o FIGURE 5. Here, it will be noted that the printer timing and character generation functions are controlled by a microprocessor, which may be the same microprocessor 7G employed with ~he measuring circuit on the measuring circuit and indicator card ~0. This microprocessor may constitute an 8048 or 8748 single chip microprocessor manufactured by Intel Corporation and programmed for both measurement and print control functions. On the other hand, the microprocessor for the printer 56 may be self-contained microprocessor constituting a portion of the printer proper, and in this case the microprocessor might receive data at a data input from a measuring circuit microprocessor such as the microprocessor 70 or from some other data source. In instances where the main measuring unit microprocessor is not employed in the printer and the printer is provided with a self~con~ained microprocessor, the printer microprocessor could still constitute a single chip microprocesso.r having character matrix dot patterns stored in a non-volatile memory. Otherwise the measuring circuit microprocessor is programmed and designed to control ~he printer 56.
Before the microprocessor initiates charac~er printing, it must Eirst determine whether a ticket or other record medium has been inserted into the printer 56 through ~he slot 4~. This information is provided to the microprocessor by a ticket insertion detector 15B and a synchronizalion detector 160. The ticket insertion detector 158 includes a ligh~
source, such as a light emitting diode 162, which transmits light across a slot 1~4 in a sensing block 1~6 to a light sensitive transistor or similar solid state device 168. I'he sensing block is mounted on the po~er supply circuit board 58 and is directly aligned with a blade 170 extending from the rear side of the carriage. When the push button is pressed, the blade 170 enters the slot 16~ and prevents light from the light emitting diode 162 from reaching the ligh~ sensitive transitor 168. This provides a ticket insertion signal on the line 74 to the microprocessor 70.
Similarly, the synchronization detector 160 includes a sensing block 17Z which is suitably mounted upon the power supply circuit board 58 to sense the position of the cam 112.
The synchronization detector includes a light emitting element, such as a light emitting diode 174, positioned by the sensing block 172, and a light sensitive transistor 1-/6 positioned by the sensing block 172 opposite to the light emitting diode 174. With the slot 173, the light from the light emitting diode 174 will strike the transistor 176 and provide a proper position signal on the line 76 ~o the microprocessor 70.
To activate ~he printer 56, ~he print button 52 is depressed -to rotate -the carriage 118, and a ti.cket or other record medium is inserted. When the print button is then released, the blade 170 leaves the slot 164 and a signal is sent to the microprocessor 70 to indicate that a ticket is in a position for printing. When ~he microprocessor program recogniæes that a ticket has been inserted, that input data has been stored, and that the printer is in the proper start position, printing will begin. If, however, the printer is not in the proper start position, the microprocessor will cause adjustments until the printer is in the proper start position and a start signal i6 received from ~he synchronization detector 160.
Referring to FIGURE 6, it will be noted that the printing unit are provided with outwardly facing threaded apertures 196 and 198 that are adapted to align with holes ~00 and Z02 formed in the power circuit board 5~ and the measuring and indicator circuit board 60 respec~ively. Threaded screws or other suitble fasteners may then be inserted through the holes 200 and 202 and threaded into the apertures 196 and 198 to attach the circuit boards 58 and 60 to the printer 56. It is imperative that the power circuit board be carefully aligned with the printer, as the power circuit board carries the sensing blocks 166 and 172 (FIGURE 7). Since the slot 164 in the sensing block 166 must be aligned with the blade 170 on the cariage 118 while the slot 175 in the sensing block 172 must be aligned to receive the flange 106, the power circuit board 58 must be carefully positioned with respec~ -to the printer 56.
To achieve this position, the upper and lower spacing bars 94 and 96 which engage the power circui~ board 58 are each provided with rearwardly projecting locator pins 204 which project into locator holes 206 ~provided in the power circuit board between the holes 200. This insures alignment of the power circuit board and the sensing blocks 166 and 172 with corresponding components of the printer.
After the power circuit board 58 and ~he measuring and indicator circuit board 60 are secured to the printer 56, a tubular spacer 208 having a threaded aperture at each end may be positioned between the free ends of the power circuit board and the measuring and indicator circuit board in alignment with holes 210 and 21Z the.rein. This spacer may then be secured by threaded screws or other fasteners inserted through the holes 210 and 212 and into the spacers, thereby creating a very rigid assembly. Now a flat belt type connector 214 which is secured to the power circuit board 58 may be passed beneath the prin~er 56 and secured to a proper socket (not shown), on the measuring and indicator circuit board 60 to comple~e the power and other connections thereto.
The operational module formed by the printer 56, the power circuit board 58, and the measuring and indicator circuit board 60 may easily be inserted within the enclosure 28 in the first housing assembly 14 and is positioned and supported .L ~ 3~
therein by locator bars 216 formed in the first housing assembly. It will now become apparent that when the second housing asseïnbly 16 is secured to the first housing assembly, the slot 44 will align with a 610-t 218 in the measuring and indicator circuit board 60.
As previously stated, th~e print button 50, zero button 52, and power on/standby button 54 are removed from the first housing assembly l~ wi~h the second housing assembly 1~. One method for accomplishing this may be to provide the second housing assembly with a face plate 220 provided with apertures 2Z2 which are dimensioned to permit only a portion of the buttons 50, 52 and 54 to project therethrough. Each of these buttons may be provided with a flange 224 which contacts the face plate 220 and limits the outward projection of the buttons through the apertures 222. Biasing springs 226 for biasing these buttons outwardly may be retained between the face plate 220 and a rear wall 228 on the second housing assembly which cooperates with the face plate to form the recessed face plate 40. The face plate 220 and rear wall 228 are arranged to permit limited inward movement of the buttons SO, 52 and 54.
The print button 50 includes an extension rod 140 which operates, when the p.rint button is depressed, to make contact on the printer. This extension rod extends -through an aperture 230 in the rear wall 228 and an aperture 232 in the measuring and indicator circuit board 60 ~o reach the printer 56.
Jr~ t, ;~
Similarly, the ~ero but-ton 52 is provided with a short extension rod 234 which ex~ends through an aperture 236 in the rear wall 228 and which contacts a zero control but-ton 238 on the measuring and indicator circuit board.
Finally, the power on/standby hutton 54 is provided with an extension rod 240 which extends through an aperture 242 in the rear wall 2Z8 and an aperture 2~ in the measuring and indicator circuit board 60 to the power switch 55 mounted upon the power circuit board 58.
To achieve effective operation of the modular, portable, electronic measuring system and printing unit 10 in the manner described, the single chip microprocessor 70 may be programmed in accordance with the following program. If the printing unit 56 includes a self-contained microprocessor 70 and is employed as a separate unit, this microprocessor pro~ram would then begin at line 776 of the followlng program.
When the printing unit 56 is combined in the modular system lO of FIGURE l, an extremely compact and efficient measuring and printing unit i6 provided. Other aspects and advantages of the presant invention will be readily apparen-t from a consideration of the specification and the appended drawings.
The present invention relates generally to electronic measuring units capable of providing a digital indication representative of a value to be measured while simultaneously providing a printed representation of such digital indication upon a record form.
BACKGROUND ART
Recent advances in electronic technology which have made available low cost but efficient microprocessor systems have led to the development of improved electronic measuring systems capable of providing a digital indication representative of a value to be measured. These microprocessor controlled systems, such as that disclosed by U.S. Patent No.
3,962,570 to Loshbough, provide automatic zeroing, zero set functions, tare control, and many other func~ions previously provided by much more complex logic circuits, such as tha~
disclosed by U.S. Patent No. 3,665,169 to Henderson et al.
Additionally, microprocessor measuring systems may be programmed to provide a number of calibLation functions and other program control functions which previously have been performed by excessively expensive, large and complex electronic units.
Although microprocessor technology has resulted in the ~tl~fJ~
development of electronic measuring systems having greatly enhanced capabilities, such systems are generally still of substantial size, expensive, and difficult to service. This is particularly true when the measuring system i5 combined with both a visual digital indicator and a printer assembly for providing a record printout of the visual display. Combined electronic measuring and printer systems, such as ~hose used for electronic weighing, are generally both large and complsx, as illustrated by U.S. Patent Nos. 3,623,119, to Orr and 3,701,991 to Livesey. Consequently, there is a demand for a small, compact, modular electronic measuring unit and printer system which may be operated from either a battery or a conventional power supply and which, although adapted to a wide variety of uses, may be easily and inexpensively serviced and repaired.
OBJ~CTS OF THE INVENTION
It is the primary object of the present invention to provide a low cost, compact, modular electronic measuring and printing unit which is of simple construction and which may be easily serviced in the field. This unit is constructed for enclosure within a ~mall, portable housing having at least one removable wall to provide access to the enclosure within the housing. The electronic system for the unit is modular with a power ~upply system being mounted upon a circuit card adjacent the rear of the housing and the electronic circuitry for -the mesuring unit being moun-ted with an indicator system therefor on a circuit card adjacent the front wall of the housing. The Eront wall of the housing încludes a window to facilitate visual observation of the indicator.
The present invention further provides a modular, portable electronic measuring unit mounted within a housing having a removable front wall section to provide access to the enclosure within the housing. The measuring system includes a power supply circuit provided upon a removable circuit card adjacent the rear of the housing and a measuring and indicator circuit provided upon a removable circuit card adjacent the front wall of the housing. The front wall of the housing carries mechanical control members removable with the front wall which cooperate with the measuring circuit card to control the operation of the measuring circuit when the front wall section is in place on the housing. This unit is designed to provide convenient access to the measuring circuit card so that simple calibration adjustment is facilitated.
Another aspect oE the present invention is to provide a novel and improved modular, portable electronic measuring unit and printer system which is conveniently mounted within a small portable compact housing. The power supply circuit for both the printer and the measuring system is mounted upon a single circuit card adjustment the rear wall of the housing, while the measuring circuit and control circuit for the printer P ~
system is mounted upon a single circuit card adjacent the front wall of the housiny. This front circuit card also bears an indicator unit Eor the measuring system which provides a visual indication through a window in the front wall of the housing.
Control actuators for both the measuring system and the printer are provided by elements mounted on the housing front wall and removab]e from the housing with the front wall.
It is another object of the present invention to provide a printer for use with an electronic measuriny system which operates to print alpha or numeric characters on a single or multiple copy pre-printed ticket form. The ticket form is inserted under a dot marker until a stop is engaged, wherein the ticket form will then be automatically fed out of ~he printer as printing occurs. The printer timing and printing lS are controlled by a microprocessor.
A further aspect of the present invention is to provide a printer for use with an electronic measuring system having a print unit which is mounted for movement in a first plane and a print drive assembly to selectively move the print unit between spaced points in the first plane. The print unit marks an adjacent record medium and a record medium drive unit is provided to move the record medium in a second plane transverse to the first plane.
~ further object of the presen-t invention is to provide a modular, electronic measuring and printiny unit wherein a sinyle microprocessor chip is employed to control analog to digital conversion, arithmetic and display functions as well as the operation of a printer unit.
A still further object of the invention is to provide a modular electronic measuring and printing unit wherein a printer is employed as the chasis for the electronic circuit boards for the system. Novel circuit board structures are provided with sensing units and other components positioned to cooperate with pcinter components, and ~hese circuit board structures are uniquely combined with the printer to form an operative module.
Additional objects, advantages and features of the invention will be more readily apparent from the following detailed description of a preferred embodiment of the invention when taken together with the accompanying drawings.
BRIEF DESCRIP'rION OF TH~ DRAWINGS
FIGURE 1 is a perspective view of the modular electronic measuring and printing unit of the present invention;
FIGURE 2 is a partially cut away side view of the modular electronic measuring and prin~ing unit of FIGURE 1 with the first and second sections of the housing assembly separated;
FIGURE 3 is a diagrammatic plan view of the interior of the electronic measuring and pri.nting unit of FIGURE 1;
FIGURE 4 is a block diagram o:E the power supply circuit and circuit for the electronic measuring and indicator sys-tem for the modular electronic measuring and printinq unit of FIGURE l;
FIGURE 5 is a block diagram of the elec-tronic circuit for the printer of FIGURE 3;
FIGURE 6 is an exploded view of the elec~ronic measuring and printing unit of the present invention; and FIGU~E 7 is an exploded section of the power circuit board of FIGURE 6 in combination with the detectors of FIGURE 5.
DETAILED D~SCRTPTION OF INVENTIO~
Referring now to FIGURES 1 to 3, the modular, portable, electronic measuring system and printing unit of the present invention indicated generally at 10 includes a housing 12 which is formed from a firs-t housing assembly 14 and a second housing assembly 16. The housing assembly 14 includes a top wall 18, a bottom wall 20, a rear wall ~2, and side walls 24 and 26, preferably formed as a unitary unit which deEi.nes an enclosure 23 having an open front side 30.
The second housing assembly 16 is adapted to be removably secured to the first housing assembly and operates to close the open front side 30 of the enclosure 28. This second housing assembly is formed by a top wall 3Z, a bottom wall 34, and side walls 36 and 38, all of which are connected together and substantially coextensive with the top, bottom and side walls of the f:irs-t housing assembly 1~ when the two housiny assemblies are connected together. The top, bottom, and side walls oE the second housing assembly provide a frame for a recessed face plate 40 which closes the open front side of the enclosure 28 when the second housing assembly 16 is secured to the first housing assembly 14. This may be accomplished by means of an indented, projecting Elange 42 which ex~ends from the front edge oE the top, bottom, and side walls of ~he first housing assembly 14 and which is adapted to slide within the open rear side of the second housing assambly 16 to engage the inner surface of the walls thereof.
The face plate 40 includes an elongated slot 4~ which receives a ticket or other record medium and a window 46 which is position to permit visual obsveration of a digital display indicator 48 mounted within the enclosure 28. Also mounted upon the face plate 40 are a print button 50, a zero button 5Z
and a power on/standby button 54 which cooperates with a power switch 55. These buttons may be depressed relative to the face plate 40, but are peLmanently mounted upon the face plate and are removable from the first housing assembly 14 with the second housing assembly 16.
FIGURE 3 provides a diagrammatic illustration of the arrangement of components within the enclosure 28. This arrangement is quite significant, for it not only contributes to the compactness of the uni-t lO, but also facilitates simple and economic maintenance. It will be noted from FIGURE 3, that a printer unit 56 is mounted within the enclosure so as to be in alignment with the slot 44 and operable by the print button 50. Also occupying the enclosure with the printer unit are a power supply circuit board 58 and a measuring and indicator circuit board 60. These two circui~ boards are mounted on the printer unit 56 to form a sub-assembly that is completely functional when removed from the enclosure 28 and which may be conveniently replaced as a single unit. I~ is importan~ to note that the power supply circuit board is positioned adjacent the rear wall 2Z of the enclosure while the measuring and indicator circuit board 60 is positioned adjacent the open front side 30 of the enclosure and thus adjacent to the faceplate 40. Since the measuring and indicator circuit board carries the measuring circuit, the microprocessor unit, calibration adjustments, and the indicator unit Eor the system, the position of this board makes calibration simpler.
Consequently, when the second housing assembly 16 is removed from the first housing assembly 14, the calibration controls and indicator are then readily accessible for convenient calibration.
With the power supply circuit board 58 arranged adjacent to the rear wall 22, convenient access for the input power line to the housing 12 is provided. This input power line will carry a power supply conductor 62 directly to the power supply circuit board 58; the shor-t path thereby minimi2ing possible interference cause by the power supply conductor. A measuring signal conductor 64, which provides an electrical signal from a suitable measuring ~ransducer to the measuring and indicator circuit board 60 may be routed through a separate entry for isolation from the power supply conductor. The conductor 64 might provide an eleetrical measurement signal from a load cell unit ~5 when the modular portable eleetronic measuring and printer unit 10 is employed for weighing applieations. The rearwar~ positioning of the power supply eircuit board 58 within the enclosure 28 provides convenient access to this board for the input power line 62 while also enabling this board to convenien~ly supply power to the printer 56 and the measuring and indicator circuit board 60. Also, since the power supply eircuit board reguires no adjustment, it need not be as accessible as the measuring and indicator circuit board 60.
With reference to FIGURE 4, it will be noted that the measuring and indicator eireuit board 60 reeeives the input measurement signal on the line 76~ at an analog input and adjust eireuit 66. This cireuit may eonstitute any input eireuit for providing low drit amplifieation while permitting some analog adjustments to the ineoming measurement signal.
For example, in an eleetronie weighing system, this adjustment eircuit might include the conventional operational amplifiers, eomparators, span adjust eireuitry, over capaeity adjust eireuitry, and dead load adjust circuitry. From the adjust eireuit 66, the adjusted measurement signal is fed to an analog to digital eontrol and conversion eireuit 68 where the input analog measurement signal is converted into a digital signal for processing in a microprocessor 70. The analog to diyi.tal control ancl conversion circuit contains the circuitry necessary to accomplish a digital conversion and is locked into ~he microprocessor clock to ensure synchroniza~ion.
An auto zero adjust circuit 72, which may be activated by the control button 52, is connected to the microprocessor 70 which provides conventional automatic zero tracking and push button zeroing of the system. The microprocessor then controls the digital display provided by the visual display unit 48.
To this point, ~he components of the electronic measuring and display system contained on the circuit board 60 perform a measurement and display function in a conventional manner which is well known in the prior art. However, the microprocessor 70 is also programmed to control the operation of the printer 56, and to accomplish this function, the microprocessor receives an input from a ticket insertion detector on an input line 74 and a second input from a synchronization detector on an input line 76. The microprocessor provides control signals to a print motor driver 78 and also to a print solenoid driver 80.
The power supply circuit board includes a power supply circuit 82 to provide power to both the components on the measuring and indicator circuit board 60 as well as to components for the printer 56. For example, ~he power supply circuit provides power on a ticket detector output line 84 and 3. ~ a~
also on a synchLonization detector output line 86.
Additionally, power is supplied to other miscellaneous components of the system on a miscellaneous line 88. For example, the line 8~ could provide power to an optional heater for the modular electronic measur:ing and printing unit 10.
The control circuit for the printer 56 may best be understood with reference ~o FIGURE 5. Here, it will be noted that the printer timing and character generation functions are controlled by a microprocessor, which may be the same microprocessor 7G employed with ~he measuring circuit on the measuring circuit and indicator card ~0. This microprocessor may constitute an 8048 or 8748 single chip microprocessor manufactured by Intel Corporation and programmed for both measurement and print control functions. On the other hand, the microprocessor for the printer 56 may be self-contained microprocessor constituting a portion of the printer proper, and in this case the microprocessor might receive data at a data input from a measuring circuit microprocessor such as the microprocessor 70 or from some other data source. In instances where the main measuring unit microprocessor is not employed in the printer and the printer is provided with a self~con~ained microprocessor, the printer microprocessor could still constitute a single chip microprocesso.r having character matrix dot patterns stored in a non-volatile memory. Otherwise the measuring circuit microprocessor is programmed and designed to control ~he printer 56.
Before the microprocessor initiates charac~er printing, it must Eirst determine whether a ticket or other record medium has been inserted into the printer 56 through ~he slot 4~. This information is provided to the microprocessor by a ticket insertion detector 15B and a synchronizalion detector 160. The ticket insertion detector 158 includes a ligh~
source, such as a light emitting diode 162, which transmits light across a slot 1~4 in a sensing block 1~6 to a light sensitive transistor or similar solid state device 168. I'he sensing block is mounted on the po~er supply circuit board 58 and is directly aligned with a blade 170 extending from the rear side of the carriage. When the push button is pressed, the blade 170 enters the slot 16~ and prevents light from the light emitting diode 162 from reaching the ligh~ sensitive transitor 168. This provides a ticket insertion signal on the line 74 to the microprocessor 70.
Similarly, the synchronization detector 160 includes a sensing block 17Z which is suitably mounted upon the power supply circuit board 58 to sense the position of the cam 112.
The synchronization detector includes a light emitting element, such as a light emitting diode 174, positioned by the sensing block 172, and a light sensitive transistor 1-/6 positioned by the sensing block 172 opposite to the light emitting diode 174. With the slot 173, the light from the light emitting diode 174 will strike the transistor 176 and provide a proper position signal on the line 76 ~o the microprocessor 70.
To activate ~he printer 56, ~he print button 52 is depressed -to rotate -the carriage 118, and a ti.cket or other record medium is inserted. When the print button is then released, the blade 170 leaves the slot 164 and a signal is sent to the microprocessor 70 to indicate that a ticket is in a position for printing. When ~he microprocessor program recogniæes that a ticket has been inserted, that input data has been stored, and that the printer is in the proper start position, printing will begin. If, however, the printer is not in the proper start position, the microprocessor will cause adjustments until the printer is in the proper start position and a start signal i6 received from ~he synchronization detector 160.
Referring to FIGURE 6, it will be noted that the printing unit are provided with outwardly facing threaded apertures 196 and 198 that are adapted to align with holes ~00 and Z02 formed in the power circuit board 5~ and the measuring and indicator circuit board 60 respec~ively. Threaded screws or other suitble fasteners may then be inserted through the holes 200 and 202 and threaded into the apertures 196 and 198 to attach the circuit boards 58 and 60 to the printer 56. It is imperative that the power circuit board be carefully aligned with the printer, as the power circuit board carries the sensing blocks 166 and 172 (FIGURE 7). Since the slot 164 in the sensing block 166 must be aligned with the blade 170 on the cariage 118 while the slot 175 in the sensing block 172 must be aligned to receive the flange 106, the power circuit board 58 must be carefully positioned with respec~ -to the printer 56.
To achieve this position, the upper and lower spacing bars 94 and 96 which engage the power circui~ board 58 are each provided with rearwardly projecting locator pins 204 which project into locator holes 206 ~provided in the power circuit board between the holes 200. This insures alignment of the power circuit board and the sensing blocks 166 and 172 with corresponding components of the printer.
After the power circuit board 58 and ~he measuring and indicator circuit board 60 are secured to the printer 56, a tubular spacer 208 having a threaded aperture at each end may be positioned between the free ends of the power circuit board and the measuring and indicator circuit board in alignment with holes 210 and 21Z the.rein. This spacer may then be secured by threaded screws or other fasteners inserted through the holes 210 and 212 and into the spacers, thereby creating a very rigid assembly. Now a flat belt type connector 214 which is secured to the power circuit board 58 may be passed beneath the prin~er 56 and secured to a proper socket (not shown), on the measuring and indicator circuit board 60 to comple~e the power and other connections thereto.
The operational module formed by the printer 56, the power circuit board 58, and the measuring and indicator circuit board 60 may easily be inserted within the enclosure 28 in the first housing assembly 14 and is positioned and supported .L ~ 3~
therein by locator bars 216 formed in the first housing assembly. It will now become apparent that when the second housing asseïnbly 16 is secured to the first housing assembly, the slot 44 will align with a 610-t 218 in the measuring and indicator circuit board 60.
As previously stated, th~e print button 50, zero button 52, and power on/standby button 54 are removed from the first housing assembly l~ wi~h the second housing assembly 1~. One method for accomplishing this may be to provide the second housing assembly with a face plate 220 provided with apertures 2Z2 which are dimensioned to permit only a portion of the buttons 50, 52 and 54 to project therethrough. Each of these buttons may be provided with a flange 224 which contacts the face plate 220 and limits the outward projection of the buttons through the apertures 222. Biasing springs 226 for biasing these buttons outwardly may be retained between the face plate 220 and a rear wall 228 on the second housing assembly which cooperates with the face plate to form the recessed face plate 40. The face plate 220 and rear wall 228 are arranged to permit limited inward movement of the buttons SO, 52 and 54.
The print button 50 includes an extension rod 140 which operates, when the p.rint button is depressed, to make contact on the printer. This extension rod extends -through an aperture 230 in the rear wall 228 and an aperture 232 in the measuring and indicator circuit board 60 ~o reach the printer 56.
Jr~ t, ;~
Similarly, the ~ero but-ton 52 is provided with a short extension rod 234 which ex~ends through an aperture 236 in the rear wall 228 and which contacts a zero control but-ton 238 on the measuring and indicator circuit board.
Finally, the power on/standby hutton 54 is provided with an extension rod 240 which extends through an aperture 242 in the rear wall 2Z8 and an aperture 2~ in the measuring and indicator circuit board 60 to the power switch 55 mounted upon the power circuit board 58.
To achieve effective operation of the modular, portable, electronic measuring system and printing unit 10 in the manner described, the single chip microprocessor 70 may be programmed in accordance with the following program. If the printing unit 56 includes a self-contained microprocessor 70 and is employed as a separate unit, this microprocessor pro~ram would then begin at line 776 of the followlng program.
When the printing unit 56 is combined in the modular system lO of FIGURE l, an extremely compact and efficient measuring and printing unit i6 provided. Other aspects and advantages of the presant invention will be readily apparen-t from a consideration of the specification and the appended drawings.
Claims (34)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A modular, portable, electronic measuring unit comprising a housing having top and bottom walls, front and rear walls and two sidewalls connected to form an enclosure, power supply means mounted with said enclosure and including a power supply circuit card mounted adjacent the rear wall of said housing, measuring circuit means mounted within said enclosure and including a measuring circuit card mounted between said front wall and said power supply circuit card and electrical conductor means extending through said housing into said enclosure and connected to provide an electrical signal indicative of an entity to be measured to said measuring circuit means, at least one of said housing walls being removable to provide access to said enclosure.
2. The modular, portable, electronic measuring unit of claim 1, wherein said measuring circuit card includes indicator means mounted upon a side thereof facing said front wall, said front wall being provided with window means positioned to permit visual observation of said indicator means through said front wall.
3. The modular, portable, electronic measuring unit of claim 1, wherein said front wall is removable to provide access to said enclosure.
4. The modular, portable, electronic measuring unit of claim 1, wherein said housing includes a first assembly having top and bottm walls, a rear wall and two side walls interconnected to form an enclosure with an open front side, said power supply means and measuring circuit means being mounted within the enclosure of said first assembly, and a second assembly including said front wall removably connected to said first assembly to close the open front side of said enclosure.
5. The modular, portable, electronic measuring unit of claim 4, wherein said first assembly is a unitary unit.
6. The modular, portable, electronic measuring unit of claim 4, wherein said measuring circuit card includes indicator means mounted upon a side thereof facing said front wall, said front wall being provided with window means positioned to permit visual observation of said indicator means through said front wall.
7. The modular, portable, electronic measuring unit of claim 4, wherein manual control means are mounted upon said front wall, said manual control means being operable to contact control elements on said measuring circuit card when said second assembly is connected to said first assembly, the manual control means being removable from said first assembly with said second assembly.
8. The modular, portable, electronic measuring unit of claim 1, wherein printer means is mounted within said enclosure, said printer means being connected to receive data from said measuring circuit means and operative in response to said data to print alpha and numeric characters on a record medium.
9. The modular, portable, electronic measuring unit of claim 8, wherein said housing includes a first assembly having top and bottom walls, a rear wall and two side walls interconnected to form an enclosure with an open front side, said power supply means, measuring circuit means and the printer means being mounted within the enclosure of said first assembly, and a second assembly including said front wall removably connected to said first assembly to close the open front side of said enclosure.
10. The modular, portable, electronic measuring unit of claim 9, wherein a record medium receiving slot is provided in and extends through said front wall, said record medium receiving slot being positioned in alignment with the printer means when said second assembly is connected to said first assembly.
11. The modular, portable, electronic measuring unit of claim 10, wherein manually operated printer activating means are mounted upon said front wall, said printer activating means being manually operable to initiate operation of the printer means, the printer activating means being removable from said first assembly with said second assembly.
12. The modular, portable, electronic, measuring unit of claim 4, wherein manual control means are mounted upon said front wall, said manual control means being operable to contact control elements on said measuring circuit card when said second assembly is connected to said first assembly, the manual control means being removable from said first assembly with said second assembly.
13. The modular, portable, electronic, measuring unit of claim 12, wherein said measuring circuit card includes indicator means mounted upon a side thereof facing said front wall, said front wall being provided with window means positioned to permit visual observation of said indicator means through said front wall.
14. The modular, portable, electronic, measuring unit of claim 11, wherein the printer means includes a support means, print means mounted upon said support means for movement in at least a first plane, said print means being operative to mark an adjacent record medium, printer drive means mounted upon said support means and operative during the formation of a character to selectively move said print means between spaced points in said first plane, record medium drive means mounted upon said frame in a position to receive a record medium from said record medium receiving slot and operative to position the record medium relative to said print means for marking thereby, said record medium drive means operating during the formation of a character to move said record medium in a second plane transverse to the first plane of movement of said print means.
15. The unit of claim 14, wherein said printer drive means includes elongated mounting means secured to said support means, said print means being mounted for longitudinal movement in said first plane on said elongated mounting means, said print means being mounted also for pivotal movement on said elongated mounting means, said manually operable printer activating mans being operable to pivot said print means about said elongated mounting means.
16. The unit of claim 15, wherein said record medium drive means includes record medium hold down means connected to said print means to pivot therewith about said elongated mounting means.
17. The unit of claim 16, wherein said record medium drive means includes a record medium drive roller rotatably mounted upon said support means, said record medium hold down means being operable in a first position to clamp a record medium against said record medium drive roller and to pivot away from said first position with said print means to facilitate insertion of a record medium between said hold down means and said record medium drive roller.
18. An electronic measuring and printing unit comprising electrical measuring means operative to provide an output signal indicative of the magnitude of an entity being measured thereby, a single chip microprocessor means connected to receive said output signal and register an indication in response thereto, and a printer unit for forming alpha and numeric characters on a record medium in accordance with the indication registered by said single chip microprocessor means, the printer unit including a support means, record medium drive means mounted upon said support means to receive and position a record medium, said record medium drive means operating during the formation of a character to move said record medium in a first plane, printer assembly means including print means mounted upon said support means and operative to mark said record medium, said printer assembly means including position control means to cause relative movement between said print means and said record medium in a second plane transverse to said first plane during the formation of a character, said single chip microprocessor means being connected to control the operation of said printer assembly means in accordance with the indication registered thereby.
19. The electronic measuring and printing unit of claim 18, wherein said electrical measuring means includes load cell means for providing an analog signal indicative of a weight applied thereto, and analog to digital conversion means connected to received said analog signal and operative to provide a digital output signal to said single chip microprocessor means.
20. The electronic measuring and printing unit of claim 19, which includes indicator means connected to said single chip microprocessor means, said indicator means operating to provide a visual digital display indicative of the digital output signal received by said single chip microprocessor.
21. A circuit board for use in combination with a printer unit and adapted to be mounted on the printer unit to position components carried by said circuit board for cooperation with the printer unit components comprising a body for mounting electrical components, position sensing means mounted upon one surface of said body and adapted to sense the position of at least one structural component of said printer unit when said body is properly positioned on said printer unit, and mounting and alignment means formed on said body to facilitate attachment of said circuit board to said printer, said mounting and alignment means operating to position said position sensing means on said printer to sense the position of said printer unit structural component.
22. The circuit board of claim 21, wherein said mounting and alignment means include a plurality of apertures formed in said body and adapted to cooperate with corresponding positioning and connecting means on said printer unit, said apertures being positioned relative to said position sensing means to locate said position sensing means relative to the printer structural component sensed thereby.
23. The circuit board of claim 22, wherein said position sensing means includes a sensing block projecting from said body, a slot for receiving said printer structural component formed in said sensing block and dividing said sensing block into first and second sections, a sensing signal transmitting means mounted in said first section for transmitting a sensing signal across said slot and a sensing signal receiving means mounted in said second section signal.
24. A circuit board for use in combination with printer unit having a record medium support means for supporting a record medium to be printed, said circuit board being adapted for mounting on the printer unit to position components carried by said circuit board for cooperation with printer unit components comprising a body for mounting electrical components, an elongated slot formed in said body to receive said record medium, and mounting and alignment means formed on said body to facilitate attachment of said circuit board to said printer unit, said mounting and alignment means operating to position said slot relative to said record medium support means to cause a record medium passing through said slot to pass over said record medium support means.
25. The circuit board of claim 24, which includes visual digital indicator means mounted upon said body and an aperture formed in said body above said slot to receive a printer unit actuator.
26. A circuit board assembly for use in combination with the printer unit having a record medium support means for supporting a record medium to be printed, said circuit board assembly being adapted for mounting on the printer unit to position components carried by said circuit board assembly for cooperation with printer unit components and comprising a first and a second circuit board adapted to be mounted in substantially parallel relationship on opposite sides of said printer unit, each such circuit board including a body for mounting electrical components, said first circuit board including an elongated slot formed in the body thereof to receive said record medium and first mounting and alignment means formed in the body thereof to facilitate attachment of said circuit board to said printer unit, said first mounting and alignment means operating to position said slot relative to said record medium support means to cause a record medium passing through said slot to pass over said record medium support means and said second circuit board having position sensing means mounted upon one surface of the body thereof and adapted to sense the position of at least one structural component of said printer unit when said body thereof is properly positioned on said printer unit, and second mounting and alignment means formed on the body of said second circuit board to facilitate attachment thereof to said printer unit, said second mounting and alignment means operating to position said position sensing means in position on said printer unit to sense the position of said printer unit structural component.
27. The circuit board assembly of claim 26, which includes electrical connector means to connect said first circuit board to said second circuit board.
28. The circuit board assembly of claim 27, wherein said second circuit board includes means to receive power from an external power source.
29. The circuit board assembly of claim 28, wherein said second circuit board includes switch means mounted on the same surface of the body thereof as said position sensing means, said switch means being connected to control the reception of power from said external power source, and the body of said first circuit board is provided with a control aperture formed therein to receive an actuator for said switch means, said first and second mounting and alignment means operating to position said first and second circuit boards respectively on said printer with said control aperture in alignment with said switch means.
30. The circuit board assembly of claim 29, wherein said position sensing means for said second circuit board includes a sensing block projecting from the body thereof, a slot for receiving said printer structural component formed in said sensing block and dividing said sensing block into first and second sections, a sensing signal transmitting means mounted in said first section for transmitting a sensing signal across said slot and a sensing signal receiving means mounted in said second section for receiving said sending signal.
31. An electronic measuring and printing module comprising a printer unit for forming alpha and numeric characters on a record medium, said printer unit including a support means and print means mounted upon said support means and operative to mark an adjacent record medium, and a circuit board assembly secured to said support means to position components carried by said circuit board assembly for cooperation with components of said printer unit, said support means operating as a chasis for said circuit board assembly which includes a power circuit board, position sensing means mounted upon one surface of said power circuit board and adapted to sense the position of at least one structural component of said printing unit when said power circuit board is properly positioned on said printer unit support means, and mounting and alignment means formed on said power circuit board to facilitate attachment of said power circuit board to said support means, said mounting and alignment means operating to position said position sensing means on said support means to sense the position of said printer unit structural component.
32. The electronic measuring and printing module of claim 31, wherein said print means is mounted upon said support means for movement in at least a first plane between a start and a stop position, said position sensing means operating to indicate whether said print means is in the start position.
33. The electronic measuring and printing module of claims 21, wherein said printer unit includes record medium drive means mounted upon said support means and operative to receive and position a record medium relative to said print means, said record medium drive means including hold down means movably mounted upon said support means and adapted for movement to permit reception of a record medium by said record medium drive means, said position sensing means operating to indicate when said hold down means is moved to permit such reception of a record medium.
34. The electronic measuring and printing module of claim 31, wherein said circuit board assembly includes a measuring and indicator circuit board mounted upon said support means on a side thereof opposite to said power circuit board, said measuring and indicator circuit board including an electronic measuring circuit and a visual, digital indicator connected thereto, said power circuit board including means to receive power from an external power source and electrical connector means to connect said power circuit board to said measuring and indicator circuit board.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/174,279 US4393455A (en) | 1980-07-31 | 1980-07-31 | Modular electronic measuring and printing unit |
| CA000382379A CA1163138A (en) | 1980-07-31 | 1981-07-23 | Modular electronic measuring and printing unit |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000382379A Division CA1163138A (en) | 1980-07-31 | 1981-07-23 | Modular electronic measuring and printing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1183961A true CA1183961A (en) | 1985-03-12 |
Family
ID=25669386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000444793A Expired CA1183961A (en) | 1980-07-31 | 1984-01-05 | Modular electronic measuring and printing unit |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1183961A (en) |
-
1984
- 1984-01-05 CA CA000444793A patent/CA1183961A/en not_active Expired
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|---|---|---|---|
| MKEX | Expiry |