CA1124814A - Monitoring equipment - Google Patents
Monitoring equipmentInfo
- Publication number
- CA1124814A CA1124814A CA330,295A CA330295A CA1124814A CA 1124814 A CA1124814 A CA 1124814A CA 330295 A CA330295 A CA 330295A CA 1124814 A CA1124814 A CA 1124814A
- Authority
- CA
- Canada
- Prior art keywords
- housing
- monitoring equipment
- signal
- machine
- rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Time Recorders, Dirve Recorders, Access Control (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to a self-contained piece of electronic equipment for monitoring the progress of a processing operation (e.g. production from a machine) and in its preferred embodiments gives digital displays of achievement and target counts for the monitored operation as well as a constantly updated performance rating based on a ratio of true achievement.
The invention relates to a self-contained piece of electronic equipment for monitoring the progress of a processing operation (e.g. production from a machine) and in its preferred embodiments gives digital displays of achievement and target counts for the monitored operation as well as a constantly updated performance rating based on a ratio of true achievement.
Description
~i24814 This invention relates to a simple piece of self-contained, free standing equipment which is capable of giving a visual dis-play of the efficiency of a wide range of different processing operations.
In many commercial operations it would be helpful to know, at any instant, the precise efficiency which was then being at-tained for that operation. Such information would enable early diagnosis of malfunctioning, would permit operators and/or managers to see how the operation is proceeding (and for operat-ors on piece-rate or bonus working rates, what their likely earnings will be) and would generally improve the degree of control which can be exercised over that particular operation.
At the present time simple equipment which can be used with a wide variety of different processing apparatus is not available and this invention seeks to provide such equipment.
It has been proposed (in U.K. Patent Specification No.
1,354,184) to provide a tobacco processing or packing machine with sensors linked to a computing circuit and to provide visual displays of inter alia the proportion of reject products produced, the efficiency of production of products by the machine, the total output of products in a stated period and the maximum production achievable. However, the computing equipment provid-ed in Specification No. 1,354,184 adds considerably to the cost of the machines and since it is an integral part of the machine cannot be used with other machines operating in different manners.
It has also been proposed (in U.K. Patent Specification No. 1,493,741) to provide equipment which can be used with a a range of different machines to indicate at any instant the out-- 1~Z4814 put from the machines and further to give a warning if the mach-ine is working too slowly (for efficient production) or too quickly (for acceptable machine life). The equipment described does not however provide a visual display of the overall effic-iency of working of the machine, merely indicating when thatefficiency is outside present limits, and thus fails to give the vital information needed for optimum control of the monitored machine.
U.K. Patent Specification No. 1,493,741 discloses equip-ment for use with liquid processing plant to give instantaneous readings of the gain or loss experienced during chemical pro-cessing and thereby to permit the operating parameters of the process plant to be adjusted as soon as such adjustment becomes necessary. The equipment described is for a large scale chemi-cal processing plant and is not suitable for general use andfurther does not provide the full range of information necessary to assess the performance of any one of a wide range of different processing apparatus.
According to the present invention monitoring equipment for use with a processing machine to indicate the efficiency of the machine in achieving a desired processing rate comprises, in combination, a housing remote from the machine, electronic clocking means within the housing to generate timing pulses, a presettable control within the housing to determine the rate at which pulses are fed from the clocking means to a computing circuit as a first signal, the prescttable control including a manually settable device on which the repetition rate for the first signal can be set digitally, input terminals to the housing connected to the computing circuit to which imput term-_ 2 _ ~ 112~814 inals can be attached a sensing means associated with the processing machine and which generates second signal pulses at a rate indicative of the performance of the machine in process-ing, the computing circuit including means to generate a third signal which represents a ratio of the first and second signals and including at least one digital display device on the housing on which device periodically updated values of the third signal are displayed.
Preferably the presettable control includes a series of thumb wheels which can be easily set to indicate a required repetition rate for the first signal. Suitably the thumb wheels are mounted where they can be accessible from outside the hous-ing and conveniently a selector switch is provided ~also on the outside of the housing) to permit the rate set on the thumb wheels to be either a rate per minute or a rate per hour. A
clocking means based on an electronic treatment of mains frequen-cy is preferred.
Suitably, the third signal represents percentage efficiency and is conveniently displayed as four digits. In a simple embod-iment of the invention just the third signal is displayed whilein a more sophisticated arrangement, the housing includes three visual digital devices, one for each of the first, second and third signals.
Suitably the housing supports a readily accessible "reset"
In many commercial operations it would be helpful to know, at any instant, the precise efficiency which was then being at-tained for that operation. Such information would enable early diagnosis of malfunctioning, would permit operators and/or managers to see how the operation is proceeding (and for operat-ors on piece-rate or bonus working rates, what their likely earnings will be) and would generally improve the degree of control which can be exercised over that particular operation.
At the present time simple equipment which can be used with a wide variety of different processing apparatus is not available and this invention seeks to provide such equipment.
It has been proposed (in U.K. Patent Specification No.
1,354,184) to provide a tobacco processing or packing machine with sensors linked to a computing circuit and to provide visual displays of inter alia the proportion of reject products produced, the efficiency of production of products by the machine, the total output of products in a stated period and the maximum production achievable. However, the computing equipment provid-ed in Specification No. 1,354,184 adds considerably to the cost of the machines and since it is an integral part of the machine cannot be used with other machines operating in different manners.
It has also been proposed (in U.K. Patent Specification No. 1,493,741) to provide equipment which can be used with a a range of different machines to indicate at any instant the out-- 1~Z4814 put from the machines and further to give a warning if the mach-ine is working too slowly (for efficient production) or too quickly (for acceptable machine life). The equipment described does not however provide a visual display of the overall effic-iency of working of the machine, merely indicating when thatefficiency is outside present limits, and thus fails to give the vital information needed for optimum control of the monitored machine.
U.K. Patent Specification No. 1,493,741 discloses equip-ment for use with liquid processing plant to give instantaneous readings of the gain or loss experienced during chemical pro-cessing and thereby to permit the operating parameters of the process plant to be adjusted as soon as such adjustment becomes necessary. The equipment described is for a large scale chemi-cal processing plant and is not suitable for general use andfurther does not provide the full range of information necessary to assess the performance of any one of a wide range of different processing apparatus.
According to the present invention monitoring equipment for use with a processing machine to indicate the efficiency of the machine in achieving a desired processing rate comprises, in combination, a housing remote from the machine, electronic clocking means within the housing to generate timing pulses, a presettable control within the housing to determine the rate at which pulses are fed from the clocking means to a computing circuit as a first signal, the prescttable control including a manually settable device on which the repetition rate for the first signal can be set digitally, input terminals to the housing connected to the computing circuit to which imput term-_ 2 _ ~ 112~814 inals can be attached a sensing means associated with the processing machine and which generates second signal pulses at a rate indicative of the performance of the machine in process-ing, the computing circuit including means to generate a third signal which represents a ratio of the first and second signals and including at least one digital display device on the housing on which device periodically updated values of the third signal are displayed.
Preferably the presettable control includes a series of thumb wheels which can be easily set to indicate a required repetition rate for the first signal. Suitably the thumb wheels are mounted where they can be accessible from outside the hous-ing and conveniently a selector switch is provided ~also on the outside of the housing) to permit the rate set on the thumb wheels to be either a rate per minute or a rate per hour. A
clocking means based on an electronic treatment of mains frequen-cy is preferred.
Suitably, the third signal represents percentage efficiency and is conveniently displayed as four digits. In a simple embod-iment of the invention just the third signal is displayed whilein a more sophisticated arrangement, the housing includes three visual digital devices, one for each of the first, second and third signals.
Suitably the housing supports a readily accessible "reset"
2~ control (to ena~le the or each visual digital device to be reset to zero) and optionally also a "hold" control which acts to interrupt the feeding of pulses from the clocking means to the computing circuit.
1~24~14 The housing can also include terminals from which signals indieative of the first, second and/or third signals can be obtained for supply to a remote monitoring location ~e.g. a central supervising station) and suitably only optical inter-connections are used between the terminals and the computing eircuit within the housing.
Two embodiments of monitoring equipment in aecordanee with the invention will now be deseribed, by way of example, with referenee to the aceompanying drawings, in which Figure 1 is a perspeetive ~iew of the first embodiment of e~uipment, Figure 2 is a circuit diagram showing the computing circuit employed in the equipment of Figure 1, and Fi~ure 3 is a perspective view of a second embodiment of equipment.
The equipment shown in Figure 1 comprises a housing 1 bear-ing on its front face 2, three four-digit displays 3, 4 and 5 and a bank of three adjacent thumb wheels 6. Qn the rear face of the housing (not shown) there is provided four switches and a terminal strip for the eonnection to the equipment of leads (from a proeessing apparatus with which it is to be used) carry-ing input signals and output leads to remote display equipment~
The four switches are an on/off mains switeh, a reset switch, a "run"/"hold" selector switch and a rate selector switch.
The equipment can be used with a wide range of different types of industrial apparatus but for the purposes of explanat-ion of its mode of operation will be considered in association with a semi-automatic press tool machine which includes a sensor .,~ j .~..
" 1i248~4 on the machine (e.g. a solid state switch, proximity detector or photo-electric cell) to indicate, by means of an electric pulse, each time a press operation is completed. The machine sensor would be wired to the equipment shown in Figure 1 via the appropriate connections on the terminal strip.
The rate selector switch is set to the appropriate range (counts/minute or counts/hour~ and the thumb wheels 6 are dialled to give the target production rate which management and workers have agreed is appropriate for the press tool machine under consideration. For the sake of example this will be chosen to be 123 articles/hour and this would involve setting the thumb wheels 6 to "123" and the rate selector switch to the "counts"/
"hour" setting.
When the equipment is connected to a 50Hz mains supply, the on/off switch turned to the on position, and the run/hold switch in the "run" position, the equipment now starts counting and advances the display 4 "Target Count" by one digit every 0.4878 minutes (i~ minutes). Each time the press tool machine is operated, the pulse generated by the sensor advances the display 3 "Achievement Count" by one digit. Periodically (e.g.
every second) the ratio Achievement Count x 100 is calculated and this is represented on display 5 "Achievement %".
If we assume the press toll machine is being operated at exactly the target rate, the displays 3 and 4 will keep in step with each other throughout the working shift and the display 5 will generally be recording "100~". Should the press tool mach-ine operate at a faster rate than the target rate, the read-out on display 3 will ~e greater th~n that on display 4 and display i~24~4 5 will show an efficiency in excess of "100~". Conversely if the press tool machine operates at a slower rate than the target rate, display 4 will e~ceed display 3 and display 5 will be less than 100~. Thus at any instant during a work shift the perform-ance of the machine can be instantly assessed.
If the shift includes rest periods in which the machine is not required to work, the run/hold selector switch can be set in the "hold" position and this has the effect of stopping further advance of the "Target Count" until the switch is returned to the "run" position. Should the operators of the machine be on a piece-rate or bonus payment scheme they can continue to advance the "Achievement Count" during a rest period and thereby improve on their score on display 5. When a particular monitoring period has concluded, the displays 3, 4 and 5 ca~ all be returned to zero by momentarily operating the reset switch.
The electronic circuitry which causes the equipment shown in Figure 1 to operate in the described manner can be seen from Figure 2. In Figure 2 the sensor from the press tool machine is shown at 16, the run/hold switch at 8, the rate selector switch at 11 and the reset switch at 25. The displays 3, 4 and 5 are shown as they appear in Figure 1 and the thumb wheels are indicated by the box 6.
The power supply unit 10 is a full wave rectifier, includ-ing smoothing and voltage stabilizing units and feeds power to a 50/60 Hz converter 12 formed of a pair of 4011 NAND gates link-ed in a S/R latch configuration.
A phase comparator 13 (Motorola 4046), a low pass filter 14, a voltage controlled oscillator 15 (a 4046) and a program-~, - llZ48~4 mable frequency divider 17 (three 4029s) form a phase locked loop to which the outputs of the three thum~ wheels 6 are fed.
Each thumb wheel is a proprietary item having a four wire output and providing a logic one signal in binary coding on the approp-riate one or ones of the four wires corresponding to the digitalnumber set on the thumb wheel.
The run/hold switch 8 is connected to a pair of 4093 NAND
gates forming a control gate 19 and the optionally through a 610th frequency divider 20 (a 4024), depending on the setting of the switch 11, to a fequency divider 21(a 4040) dividing by 3000 in the case of 50Hz input or 3600 in the case of 60Hz input. The output of the divider 21 is fed directly to a 74C925 forming the driver unit for a pair of twin 7 segment 6740 LED's which represents the display 4. The display 4 thus gives a cumulative count derived from multiplying the mains frequency by the rate set on the thumb switches in the block 6, dividing by 3000 (or 3600) and if counts/hour has been selected also by 60, The switch 8 allows the display on 4 to be held or advanced at the appropriate rate. The switch 11 allows the block 20 to ~e incl-uded or by-passed and thus selects a rate/hour or a rate/minute.
The machine sensor 16 is connected via a buffer amplifier 26 (a 4093) to a 74C925 driver unit for a second pair of twin 7 segment 6740 LED's forming the display 3. Thus each time a logic onP signal appears on the input to the amplifier 26 the count on the display 3 is advanced by one.
The signal train a fed to the driver unit of the display 4 and the signal train b fed to the driver unit of the display 3 ar~ processed in a ratio circuit shown within the dashed line 11248~4 box in the left-hand corner of Figure 2. The signal a is sup-plied to a programmable frequency divider 27 which comprises two series-connected 4518 dual BCD counters (han~ling, respect-ively, the units, tens, hundreds and thousands) feeding four 4029 programmable up/down counters via ~our 4042 four-bit latches.
The signal train b is supplied to a rate multiplier cir-cuit 28 comprising two series-connected 4518 dual BCD counters feeding four 4527 up/down counters via four 4042 fout-bit latch-es. The frequency of operation of the rate multiplier 28 is set by an oscellator 29 comprising a series-connection pair of 4001 NOR gates.
The output from the rate multiplier 28 is fed to a frequency divide circuit 32 where a 4024 is used to produce one output for each one hundred inputs received.
The outputs from the frequency dividers 27 and 32 are combined in a control gate 33 (comprising a pari of 4011 NAN~
gates) and fed to the driver unit of the third display 5.
The reset switch 25 acts simultaneously to clear the memories of units 20, 21, 27 and 28 and to restore the displays
1~24~14 The housing can also include terminals from which signals indieative of the first, second and/or third signals can be obtained for supply to a remote monitoring location ~e.g. a central supervising station) and suitably only optical inter-connections are used between the terminals and the computing eircuit within the housing.
Two embodiments of monitoring equipment in aecordanee with the invention will now be deseribed, by way of example, with referenee to the aceompanying drawings, in which Figure 1 is a perspeetive ~iew of the first embodiment of e~uipment, Figure 2 is a circuit diagram showing the computing circuit employed in the equipment of Figure 1, and Fi~ure 3 is a perspective view of a second embodiment of equipment.
The equipment shown in Figure 1 comprises a housing 1 bear-ing on its front face 2, three four-digit displays 3, 4 and 5 and a bank of three adjacent thumb wheels 6. Qn the rear face of the housing (not shown) there is provided four switches and a terminal strip for the eonnection to the equipment of leads (from a proeessing apparatus with which it is to be used) carry-ing input signals and output leads to remote display equipment~
The four switches are an on/off mains switeh, a reset switch, a "run"/"hold" selector switch and a rate selector switch.
The equipment can be used with a wide range of different types of industrial apparatus but for the purposes of explanat-ion of its mode of operation will be considered in association with a semi-automatic press tool machine which includes a sensor .,~ j .~..
" 1i248~4 on the machine (e.g. a solid state switch, proximity detector or photo-electric cell) to indicate, by means of an electric pulse, each time a press operation is completed. The machine sensor would be wired to the equipment shown in Figure 1 via the appropriate connections on the terminal strip.
The rate selector switch is set to the appropriate range (counts/minute or counts/hour~ and the thumb wheels 6 are dialled to give the target production rate which management and workers have agreed is appropriate for the press tool machine under consideration. For the sake of example this will be chosen to be 123 articles/hour and this would involve setting the thumb wheels 6 to "123" and the rate selector switch to the "counts"/
"hour" setting.
When the equipment is connected to a 50Hz mains supply, the on/off switch turned to the on position, and the run/hold switch in the "run" position, the equipment now starts counting and advances the display 4 "Target Count" by one digit every 0.4878 minutes (i~ minutes). Each time the press tool machine is operated, the pulse generated by the sensor advances the display 3 "Achievement Count" by one digit. Periodically (e.g.
every second) the ratio Achievement Count x 100 is calculated and this is represented on display 5 "Achievement %".
If we assume the press toll machine is being operated at exactly the target rate, the displays 3 and 4 will keep in step with each other throughout the working shift and the display 5 will generally be recording "100~". Should the press tool mach-ine operate at a faster rate than the target rate, the read-out on display 3 will ~e greater th~n that on display 4 and display i~24~4 5 will show an efficiency in excess of "100~". Conversely if the press tool machine operates at a slower rate than the target rate, display 4 will e~ceed display 3 and display 5 will be less than 100~. Thus at any instant during a work shift the perform-ance of the machine can be instantly assessed.
If the shift includes rest periods in which the machine is not required to work, the run/hold selector switch can be set in the "hold" position and this has the effect of stopping further advance of the "Target Count" until the switch is returned to the "run" position. Should the operators of the machine be on a piece-rate or bonus payment scheme they can continue to advance the "Achievement Count" during a rest period and thereby improve on their score on display 5. When a particular monitoring period has concluded, the displays 3, 4 and 5 ca~ all be returned to zero by momentarily operating the reset switch.
The electronic circuitry which causes the equipment shown in Figure 1 to operate in the described manner can be seen from Figure 2. In Figure 2 the sensor from the press tool machine is shown at 16, the run/hold switch at 8, the rate selector switch at 11 and the reset switch at 25. The displays 3, 4 and 5 are shown as they appear in Figure 1 and the thumb wheels are indicated by the box 6.
The power supply unit 10 is a full wave rectifier, includ-ing smoothing and voltage stabilizing units and feeds power to a 50/60 Hz converter 12 formed of a pair of 4011 NAND gates link-ed in a S/R latch configuration.
A phase comparator 13 (Motorola 4046), a low pass filter 14, a voltage controlled oscillator 15 (a 4046) and a program-~, - llZ48~4 mable frequency divider 17 (three 4029s) form a phase locked loop to which the outputs of the three thum~ wheels 6 are fed.
Each thumb wheel is a proprietary item having a four wire output and providing a logic one signal in binary coding on the approp-riate one or ones of the four wires corresponding to the digitalnumber set on the thumb wheel.
The run/hold switch 8 is connected to a pair of 4093 NAND
gates forming a control gate 19 and the optionally through a 610th frequency divider 20 (a 4024), depending on the setting of the switch 11, to a fequency divider 21(a 4040) dividing by 3000 in the case of 50Hz input or 3600 in the case of 60Hz input. The output of the divider 21 is fed directly to a 74C925 forming the driver unit for a pair of twin 7 segment 6740 LED's which represents the display 4. The display 4 thus gives a cumulative count derived from multiplying the mains frequency by the rate set on the thumb switches in the block 6, dividing by 3000 (or 3600) and if counts/hour has been selected also by 60, The switch 8 allows the display on 4 to be held or advanced at the appropriate rate. The switch 11 allows the block 20 to ~e incl-uded or by-passed and thus selects a rate/hour or a rate/minute.
The machine sensor 16 is connected via a buffer amplifier 26 (a 4093) to a 74C925 driver unit for a second pair of twin 7 segment 6740 LED's forming the display 3. Thus each time a logic onP signal appears on the input to the amplifier 26 the count on the display 3 is advanced by one.
The signal train a fed to the driver unit of the display 4 and the signal train b fed to the driver unit of the display 3 ar~ processed in a ratio circuit shown within the dashed line 11248~4 box in the left-hand corner of Figure 2. The signal a is sup-plied to a programmable frequency divider 27 which comprises two series-connected 4518 dual BCD counters (han~ling, respect-ively, the units, tens, hundreds and thousands) feeding four 4029 programmable up/down counters via ~our 4042 four-bit latches.
The signal train b is supplied to a rate multiplier cir-cuit 28 comprising two series-connected 4518 dual BCD counters feeding four 4527 up/down counters via four 4042 fout-bit latch-es. The frequency of operation of the rate multiplier 28 is set by an oscellator 29 comprising a series-connection pair of 4001 NOR gates.
The output from the rate multiplier 28 is fed to a frequency divide circuit 32 where a 4024 is used to produce one output for each one hundred inputs received.
The outputs from the frequency dividers 27 and 32 are combined in a control gate 33 (comprising a pari of 4011 NAN~
gates) and fed to the driver unit of the third display 5.
The reset switch 25 acts simultaneously to clear the memories of units 20, 21, 27 and 28 and to restore the displays
3 and 4 to zero.
Three outputs 4', 3' and 25' are provided for connecting the unit of Figure 1 to a remote monitoring location, these out-puts producing logic signals corresponding to the outputs a and ~ and when the reset switch 25 is operated. To ensure that connections to the outputs 4', 3' and 25' cannot affect the circuit within the housing 1, the circuitry includes 75492 buffer amplifiers feeding LED's each LE~ being lin~ed optically to a photosensitive transistor in the output connection. A remote 112~814 connection for the output of control gate 33 (to drive a re-mote percentage achievement display) can also be provided although this has not been illustrated in Figure 2, Figure 3 shows a modified embodiment of monitoring equip-ment in which the displays 3 and 4 are dispensed with, but the circuit of Figure 2 is otherwise exactly as described above.
Although the specific description has referred to the equipment being used with a semi-automatic press tool machine, it should be celarly understood that it is applicable to a wide range of different operational apparatus and even has potential to non-apparatus production operations (such as packing biscuits or bottles). The target output in such cases can be calculated by reference to agreed work measurement standards laid down by the International Labour Office lILO) in Geneva.
The free-standing self-contained nature of the equipment described makes it easily transferable between different operat-ions as need arises.
~,~
Three outputs 4', 3' and 25' are provided for connecting the unit of Figure 1 to a remote monitoring location, these out-puts producing logic signals corresponding to the outputs a and ~ and when the reset switch 25 is operated. To ensure that connections to the outputs 4', 3' and 25' cannot affect the circuit within the housing 1, the circuitry includes 75492 buffer amplifiers feeding LED's each LE~ being lin~ed optically to a photosensitive transistor in the output connection. A remote 112~814 connection for the output of control gate 33 (to drive a re-mote percentage achievement display) can also be provided although this has not been illustrated in Figure 2, Figure 3 shows a modified embodiment of monitoring equip-ment in which the displays 3 and 4 are dispensed with, but the circuit of Figure 2 is otherwise exactly as described above.
Although the specific description has referred to the equipment being used with a semi-automatic press tool machine, it should be celarly understood that it is applicable to a wide range of different operational apparatus and even has potential to non-apparatus production operations (such as packing biscuits or bottles). The target output in such cases can be calculated by reference to agreed work measurement standards laid down by the International Labour Office lILO) in Geneva.
The free-standing self-contained nature of the equipment described makes it easily transferable between different operat-ions as need arises.
~,~
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Monitoring equipment for use with a processing machine to indicate the efficiency of the machine in achieving a desired processing rate comprising, in combin-ation, a housing remote from the machine, electronic clocking means within the housing to generate timing pulses, a presettable control within the housing to determine the rate at which pulses are fed from the clocking means to a computing circuit as a first signal, the presettable control including a manually settable device on which the repetition rate for the first signal can be set digitally, input termin-als to the housing connected to the computing circuit to which input terminals can be attached a sensing means associated with the processing machine and which generates second signal pulses at a rate indicative of the performance of the machine in processing, the computing circuit including means to gener-ate a third signal which represents a ratio of the first and second signals and including at least one digital display device on the housing on which device periodically updated values of the third signal are displayed.
2. Monitoring equipment as claimed in claim 1, in which the manually settable device includes a selector switch to select the repetition rate.
3. Monitoring equipment as claimed in claim 1, in which the electronic clocking means is based on the supply frequency.
4. Monitoring equipment as claimed in claim 1, in which the housing includes a single digital display of just the third signal.
5. Monitoring equipment as claimed in claim 1, in which the housing includes three visual digital displays one for each of the first, second and third signals.
6. Monitoring equipment as claimed in claim 1, in which the housing supports a manual "reset" control to reset the digital display to zero.
7. Monitoring equipment as claimed in claim 1, in which the housing supports a manual "hold" control which acts to interrupt the feeding of pulses from the clocking means to the computing circuit.
8. Monitoring equipment as claimed in claim 1, in which the housing supports terminals from which signals indicative of the first and second signals can be obtained for supply to a remote location.
9. Monitoring equipment as claimed in claim 8, in which optical interconnections are used between the terminals and the computing circuit within the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA330,295A CA1124814A (en) | 1979-06-21 | 1979-06-21 | Monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA330,295A CA1124814A (en) | 1979-06-21 | 1979-06-21 | Monitoring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1124814A true CA1124814A (en) | 1982-06-01 |
Family
ID=4114517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA330,295A Expired CA1124814A (en) | 1979-06-21 | 1979-06-21 | Monitoring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1124814A (en) |
-
1979
- 1979-06-21 CA CA330,295A patent/CA1124814A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4179611A (en) | Efficiency monitoring device | |
| US4853693A (en) | Air condition monitor unit for monitoring at least one variable of the ambient air | |
| US3928751A (en) | Seed population monitor | |
| US4225930A (en) | Planter population monitor | |
| US4225776A (en) | Electronic digital time display apparatus | |
| US4131855A (en) | Digital time signalling device | |
| CA1124814A (en) | Monitoring equipment | |
| US3510632A (en) | Digital stretch and speed indicating apparatus | |
| GB1593438A (en) | Monitoring equipment | |
| DE3789590T2 (en) | Process control system for use in adverse environments. | |
| ES2001771A6 (en) | Electronic monitoring system for a set of gaming machines | |
| JP3548925B2 (en) | Measuring device | |
| KR100394576B1 (en) | Device for monitoring speed and operating time of wafer lift of semiconductor product device | |
| GB1512407A (en) | Apparatus for monitoring the consumption of electricity | |
| US3238532A (en) | Production monitoring apparatus | |
| SU900205A1 (en) | Digital meter of coun rate | |
| JP3521656B2 (en) | Operation status monitoring device | |
| US3482083A (en) | Production pacing device | |
| GB1495566A (en) | Readout apparatus for frequency or periodanalogue measuring signals | |
| JPS6457189A (en) | Method for counting discrete pulse | |
| US4134254A (en) | Electronic timepiece device | |
| SU149579A1 (en) | Automatic device for statistical control of product quality by grouping method | |
| SU1249554A1 (en) | Device for monitoring and registering production rhythm | |
| JPS5583497A (en) | Step-out detector for pulse motor | |
| SU642717A1 (en) | Production process monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |