JPS6127036Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field of the invention This invention relates to a parking meter.

2. Description of the Related Art In general, a stationary parking meter displays the required parking time when a customer inserts a coin, and thereafter displays the remaining parking time sequentially in proportion to the elapse of the parking time. However,
Looking at the means for controlling and driving the setting display of parking time and the display of remaining parking time, in the case of conventional methods, most of the parts are mechanically constructed by combinations of gears, cams, springs, link mechanisms, etc. It is structured as follows. Therefore, a large number of parts must be used as a series of control mechanisms to set and display the parking time corresponding to the amount of coins inserted and to display the remaining parking time by measurement, which is extremely complex. It is expensive. Furthermore, since it is a mechanical structure, accuracy is reduced due to wear and failures are likely to occur. Furthermore, the relationship between the amount of coins inserted and the amount of parking time depends on the region and country where parking meters are used.
In many cases, the time system is different, but in order to correspond to this time system, it is necessary to replace and adjust many gears and cams, making it easy to change to a different time system. It cannot be done.

In order to eliminate such drawbacks, the display mechanism is constructed by mechanical means, and includes other coin detection means, time measurement means, calculation control and drive commands for parking time, calculation control and drive commands corresponding to the number of coins inserted. etc., constructed by electrical/electronic means has been proposed in Japanese Patent Application No. 100472/1983 (see Japanese Patent Application Laid-open No. 024688/1983). In this case, by using a small DC motor as the drive means for setting the machine to advance based on coin insertion and for time progression as time passes, there is almost no time delay in starting and stopping commands from the computer control. controlled by.

However, in actual operation, the start and stop operations are delayed from the command signal due to the moment of inertia GD ² of the motor rotor and the GD ² of gears, indicator hands, etc. driven by the motor. This does not pose a problem for positioning at the time of activation, as it only lengthens the driving time, but becomes a problem at the time of stopping.
In other words, because of the moment of inertia GD ² , the display hand rotates considerably after the stop command is issued before stopping, which tends to cause problems such as stopping at a position where the display hand is considerably overrun. Moreover, it is desirable that the setting display by inserting a coin be carried out in as short a time as possible, and for this reason, the rotational speed of the motor is set at a high speed, which increases the overrun phenomenon. In addition, when displaying the remaining parking time, the timer is activated and stopped many times, and due to its function, it is designed to stop immediately after activation, so the rotational torque due to inertia is large, causing an overrun phenomenon. Likely to happen. Furthermore, when a storage battery is used as a power source, voltage fluctuations are large and the voltage is high when charging is sufficient and becomes low at the end of use. Therefore, if you set it to operate well when the power supply voltage is high, there will be a lack of torque when the voltage is low.
On the other hand, if the motor is set to operate well at low voltages, the rotational speed will increase at high voltages, making it easy to cause an overrun phenomenon.

Purpose of the invention This invention was developed in view of the above points, and is a parking meter that eliminates the overrun phenomenon when the motor is stopped based on start/stop commands, and thereby allows highly accurate time display. The purpose is to obtain.

Summary of the invention In order to achieve the above object, this invention largely employs electrical and electronic means such as arithmetic control circuits, and includes a DC motor that moves the display mechanism in sets based on the insertion of coins, and a time-switch that moves the display mechanism. A load resistor is connected to each DC motor, so that when one DC motor is driving, the other DC motor is forcibly driven to generate an electromotive force, which is consumed by the load resistor to apply braking. At the same time, a control circuit is provided for each of the DC motors to prevent the DC motor from overrunning, and when one DC motor stops driving, the other DC motor is driven for a certain period of time to apply reverse braking using its rotational torque. The structure is such that the accuracy can be further improved due to the synergistic effect with the generator action.

Embodiment of the invention An embodiment of the invention will be described based on the drawings.

A. Configuration A-1. Configuration of drive unit and display mechanism First, two DC motors 1 and 2 are independently provided as drive units in the device. Here, one DC motor 1 is used for setting and feeding when setting and displaying the parking time, and its motor shaft rotates clockwise when viewed from the left in FIG.
The other DC motor 2 is used for feeding when displaying the remaining parking time, and its motor shaft rotates counterclockwise. Spur gears 3 and 4 are attached to the motor shafts of these DC motors 1 and 2, and a transmission shaft 6 having a spur gear 5 that meshes with these spur gears 3 and 4 is provided. A spur gear 7 is attached to the other end of the transmission shaft 6, and a drive shaft 9 having a spur gear 8 meshing with the spur gear 7 is provided. A display hand 10 is directly connected to the tip of the drive shaft 9. Further, a donut semicircular scale plate 11 is provided corresponding to the indicator hand 10. These constitute a basic display mechanism.

A-2 Configuration of parking time display device
A detection device 12 is installed to measure the DC motors 1 and 2 and control the stoppage of the DC motors 1 and 2 at appropriate positions. That is, this detection device 12 includes a disc-shaped detection plate 14 which is fixed to the transmission shaft 6 and has n detection holes 13 at equal intervals near its periphery, and a disc-shaped detection plate 14 having n detection holes 13 at equal intervals in the vicinity of the periphery thereof. The buffer circuit 15 uses the changed position of the detection plate 14 as a detection point.
The display needle feed control detector 16 outputs the digital signal Dp via the needle feed control detector 16. here,
As a specific means for the display needle feed control detector 16, photoelectric conversion means using a photodiode or a phototransistor placed opposite the detection hole 13 is adopted. However, the detection device 12 may be a contact means using a cam and a micro switch. Furthermore, three detection devices 1 are provided for the drive shaft 9.
7, 18, and 19 are installed. First, the detection device 17 outputs a display position regulation signal Us via a buffer circuit 20 to prevent the display position of the display needle 10 directly connected to the drive shaft 9 from falling below a specified value. 9
The cam disc 21 fixed to the cam disc 21 and the cam disc 21
and an underscale detector 22 which is a micro switch that is opened and closed at predetermined timing. Further, the detection device 18 outputs a signal Zs via a buffer circuit 23 so that the parking time can be set to a specified time more accurately than a reference value (time zero). It is composed of a disk 24 and an initial time position detector 25 which is a micro switch that is opened and closed at predetermined timing by the cam disk 24. Further, the detection device 19 sends a signal Os for regulating the display position to the buffer circuit 2 so that the display hand 10 does not rotate in steps beyond the maximum allowable parking time.
6, and is composed of a cam disk 27 fixed to the drive shaft 9 and an overscale detector 22 using a micro switch that is opened and closed at predetermined timing by the cam disk 27. That is, these detection devices 17, 18, and 19 are used to detect three types of positional relationships in synchronization with the display hand 10, and the specific means for this is as shown in FIG. Each detector 22, 25, 28 has a cam disk as one instead of providing 18, 19 individually.
A predetermined signal may be input to each independently. Alternatively, a photoelectric conversion means or a magnetoelectric conversion means using a combination of slit photoelectric elements may be used. Such a detection device 12,1
7, 18, and 19 constitute a parking time display device 29.

A-3 Relationship between the inserted coin and the amount of advance of the display hand Although not particularly shown, when a specified coin is inserted into the coin slot, a known coin sorter will determine whether the inserted coin is genuine or not. If it is a coin, the coin detector 30
The coin detector 30 passes through the buffer circuit 31 and is stored in a predetermined storage section.
Together with this, a coin detection device 32 is configured, which detects the passing of a legitimate coin and outputs a coin detection signal Mp for each coin.

Therefore, the amount of movement of the display hand 10 is not directly affected by the speed of the DC motors 1 and 2, but is determined by the rotation amount of the transmission shaft 6 and the gear ratio G of the spur gears 7 and 8. If there are n detection holes 13 on the detection plate 14 (equally spaced), the display needle 10 will change the physical quantity (angle) for each step of one detection hole 13. This results in a rotational step of 360/n×1/G degrees.

A-4 Configuration of Arithmetic Control Circuit Next, the circuit configuration including the DC motors 1 and 2, the parking time display device 29, and the coin detection device 32 will be explained with reference to the block diagram shown in FIG. First, 33 is a reference time pulse generator which is composed of a known crystal oscillation element, a sound oscillation element, and an electronic circuit, and which outputs a time pulse t having a constant period to serve as a clock device.
The clock pulse t, which is the output thereof, has a frequency division value Y and is input to a frequency division circuit 34 which outputs a frequency division pulse T every time the frequency division value Y is reached. This frequency dividing circuit 34 is composed of a preset type counter having a known clearing function.
The clear terminal CL has two OR gates 35,
A signal Us based on the underscale detector 22 is input via 36. A memory circuit 3 including a flip-flop or the like receives the frequency divided pulse T outputted from the frequency dividing circuit 34 as an input.
〓〓〓〓〓
7 is provided, and a clock feed signal Ts, which is an output from the Q terminal of this memory circuit 37, is input to a drive circuit 38 that drives the motor 2. Further, the frequency-divided pulse T is also input to the R gate 36.

On the other hand, a counter 39 is provided which inputs the coin detection signal Mp based on the coin detector 30, counts and adds the result, and outputs the resultant number of coins as a signal A from the Ax terminal. This counter 39 is composed of a well-known counter with a clear function, and its clear terminal CL is connected to the overscale detector 2 via an OR gate 40.
A signal Os based on 8 is input. Also,
The signal A from the counter 39 is output as a binary signal or a binary coded decimal signal indicating the number of coins inserted, and is input to a comparison circuit 41 comprised of a group of gate circuits and the like. A preset counter 42 is provided which receives a digital signal Dp based on the indicator needle feed control detector 16 as an input. Here, the preset counter 42 can manually change and set its preset value N, and also inputs the digital signal Dp through an AND gate 43. When the count number of the digital signal Dp reaches the preset value N, Carry pulse signal
Sp is output. This carry pulse signal Sp
is input to the counter 44, and the signal Zs is inverted by the inverter 45.
The signal is input to the clear terminal CL of the preset counter 42 via an OR gate 46 which receives signals from Zs' and the OR gate 40. Here, the signal Zs is also input to the AND gate 43. The counter 44 counts and adds up the carry pulse signal Sp and outputs the result as a signal B from the Bx terminal, and this signal B is input to the comparator circuit 41. This counter 44 is also constituted by a counter with a clear function like the counter 39, and the clear terminal CL is connected to the above-mentioned OR.
A signal from gate 40 is input. Further, the comparison circuit 41 compares the signal A and the signal B, and outputs a coincidence signal Cs when A≦B (actually A=B), and outputs a condition signal Ss when A>B. Yes, the coincidence signal Cs
is converted into a set release signal Cs' by the differentiating circuit 47 and inputted to the OR gate 40. The condition signal Ss is input to the drive circuit 49 for driving the DC motor 1 via the AND gate 48, and is also input to the OR gate 35.
and is input to the AND gate 43. Here, the output from the terminal of the memory circuit 37 is also input to the AND gate 48 . Further, the output of an OR gate 50 which receives the output of the OR gate 35 and the signal Dp is input to the clear terminal CL of the memory circuit 37.
In this way, the arithmetic control circuit 51 is constituted by circuit members excluding the DC motors 1 and 2, the parking time display device 29, the coin detector 32, and the reference time pulse generator 33.

A-5 Characteristic configuration of the embodiment However, between the terminals of the armature coins of the DC motors 1 and 2, there are load resistors 52 and 53, respectively.
and diodes 54 and 55 are connected.
Here, the diodes 54 and 55 are connected in a direction that prevents the circuit current from flowing due to the applied voltage V. Further, the drive circuits 38, 4
OR gates 56 and 57 are provided on the input side of 9. The clock feed signal Ts from the memory circuit 37 is input to the input side of this OR gate 56, and the clock feed signal Ts from the AND gate 78 is input from the time trigger circuit 58, which is a control circuit that receives the set feed signal Ss' from the AND gate 78. A time signal St is input. On the other hand, the clock feed signal Ts
A time trigger circuit 59 is provided which is a control circuit that outputs a time Tt based on the time signal Tt.
Tt and the set sending signal Ss' are input to an OR gate 57.

B. Operation In this configuration, the operation will be explained.

E-1 Assumptions regarding basic operation Here, as a standard for this parking meter, the time system is maximum parking time 120 minutes, free time 30 minutes,
It is assumed that the parking permission time per coin is 30 minutes, and the maximum number of coins inserted is 4 (120 (minutes)/30 (minutes)). Since the extra time is 30 minutes, which is the same as the amount of progress made by one coin, the scale plate 11 divides 150 degrees into five equal parts as shown in Figure 1.
-30, 0 (reference position), 30,
The scale is 60, 90, 120 (in minutes). Correspondingly, the movable range of the display hand 10 is -30 on the scale.
The range from the position to the position 120 is regulated within a range of 150 degrees, and each detection device 17, 18, 19 is also adjusted accordingly. That is, when the display hand 10 is at the initial position of -30, the signal Us is output based on the underscale detector 22, and when the indicated position of the display hand 10 is 0 or more 120
When the range is below (this range is the parking permission time zone), the signal Zs is sent based on the initial time position detector 25.
is output, and the indicated position of the display hand 10 is
Adjustments are made so that when the 120th position is reached, a signal Os is output based on the overscale detector 28. Further, the oscillation characteristic of the reference time pulse generator 33 is 60Hz, and the detection hole 1 of the detection plate 14
The number of 3s is n=10 (therefore, the pitch is 360
゜/10=36゜), the tooth ratio of spur gears 7 and 8 is G=
Suppose it is 1/36. Furthermore, the frequency division value Y is set to Y=60× so that the frequency division pulse T is output every minute.
60=3600, and the preset value N is set to 1.

A-2 Basic operation Therefore, first of all, in order to understand the operation as a parking meter, we will explain the above-mentioned patent application
The basic operation as shown in No. 100472 etc. will be explained.

E-2-1 Initial state In the initial state where the indicator hand 10 is stopped, the scale indicates -30, so the signal Us is output and the frequency divider circuit 43 and memory circuit 37 are cleared, so the DC motor 2 does not work. On the other hand, since the position of this display hand 10 is outside the parking permission time zone, the initial time position detector 2
5 does not output signal Zs and AND gate 43
is prohibited and the following preset counter 4
The 2nd etc. will not work, and the DC motor 1
doesn't work. Therefore, the display hand 10 does not make any step movement. Further, in this state, the signal B from the counter 44 is 0.

E-2-2 Initial operation by inserting a coin In this state, when a specified coin is inserted into the coin slot for parking, the coin detection signal Mp is output by the coin detector 30 after determining whether the coin is genuine or false. One pulse will be output for each coin. This coin detection signal Mp is input to a counter 39, the number of coins inserted is counted and added, and the result is output as a signal A and input to a comparison circuit 41. At this time, in the initial state, counter 4
Since the signal B from 4 is 0, the coin is 1
If even one sheet is inserted, A>B, and the comparison circuit 41 outputs the condition signal Ss. Therefore, since this condition signal Ss is output from the terminal of the memory circuit 37,
The AND gate 28 is opened and the drive circuit 49 drives the DC motor 1 . The drive of the DC motor 1 rotates the transmission shaft 6 via the spur gears 3 and 5, and further rotates the drive shaft 9 via the spur gears 7 and 8.
is rotated clockwise. In this operation, the display needle feed control detector 16 outputs the digital signal Dp in synchronization with the detection hole 13 of the detection plate 14, and on the other hand, the output of the signal Us output from the underscale detector 22 is stopped. . Here, the digital signal
Dp is input to the preset counter 42, but since the preset counter 42 has been cleared by the signal Zs', the preset counter 42 also does not perform a counting operation.

E-2-3 Parking time setting display operation In this way, the set feed DC motor 1 continues to rotate, and when the indicated position of the display hand 10 reaches the 0 position on the scale plate 11, the initial time detector 25 sends a signal. Zs is output. this signal
The preset counter 42 functions to count the digital signal Dp by the output of Zs. Here, an AND gate 43 is inserted on the input side of the preset counter 42;
The digital signal Dp is output only when the display board 10 is within the parking permission time zone during the set feeding operation in which the condition signal Ss and the signal Zs are output.
This is to perform the counting operation. Then, the feed operation by the DC motor 1 continues, and correspondingly, the digital signal Dp is sequentially outputted and counted by the preset counter 42. When this count value reaches the preset value N, a carry pulse signal Sp is generated, and the self
The contents are cleared and inputted to the counter 44. Therefore, when the value in the detection hole 13 of the transmission shaft 6 is incremented from the scale value "0" by an amount equal to the preset value N for each inserted coin, the carry pulse signal Sp is output from the preset counter 42. This causes the counter 44 to count up by one and generate the signal B. This signal B is the comparator circuit 41
is compared with the signal A from the counter 39,
When the value of B becomes equal to the value of A, a match signal Cs is output from the comparison circuit 41, the AND gate 48 is inhibited, the DC motor 1 is stopped, and the match signal Cs is output from the differentiating circuit 4.
7, it is converted into a set release signal Cs' and sent to counters 39, 44 and preset counter 42.
Clear. In other words, when the number of coins that are continuously inserted is 1, 2, 3, or 4, the DC motor 1 moves the power shaft 6 from the scale value "0" position of the scale plate 11 in response to this. N, N×
It will rotate for 2, N x 3, N x 4 minutes and then stop. Therefore, the amount of advance of the display hand 10 corresponding to one coin is 360/n×1/G×N degrees in physical quantity (angle). Here, n = 10, G = 36, N = 30, so per coin
The setting display is for 30 degrees of increments, that is, 30 minutes of parking time. As a result, if coins are inserted continuously, the setting display will be 30 minutes if there is one coin, and 60 minutes and 90 minutes if two, three, or four coins are inserted.
The setting display will be 120 minutes.

E-2-4 Display operation of remaining parking time The operation after the display hand 10 has set and displayed the parking time as specified by inserting a coin will be described. In this set state, at least the indicated position of the indicator hand 10 is within the parking permission time zone,
The condition signal Ss is also not output from the comparator circuit 41. As a result, the clear state of the frequency divider circuit 34 is released, and the reference time pulse generator 3
The clock pulses t from 3 are sequentially counted, and one frequency-divided pulse T whose count value reaches the frequency-divided value Y is output. When this frequency-divided pulse T is output, the memory circuit 37 is set and the clock feed signal Ts is output from the Q terminal. As a result, the DC motor 2 is driven via the drive circuit 38, and the display hand 10 is moved counterclockwise, that is, in the opposite direction to the setting direction. In this case as well, the transmission shaft 6 rotates (counterclockwise) and the digital signal Dp is output from the display needle feed control detector 16 in the same way as when setting. This digital signal Dp
When one pulse is output, the memory circuit 37 is cleared and the DC motor 2 is stopped. Such an operation is repeated every time the clock pulse t is divided by the frequency division value Y. Therefore, the period tω of the clock pulse t is expressed as the amount of time in the display hand 10.
The physical quantity (angle) is incremented by 360/n×1/G degrees in the counterclockwise direction every time corresponding to Y times (that is, the frequency division pulse T). Here, since T=1 (minutes), n=10, and G=36,
The display hand 10 advances counterclockwise by 1 degree per minute, and for example, if a parking time of 30 minutes is set, the remaining parking time is displayed sequentially as 29 minutes, 28 minutes, etc. becomes. This kind of action is 1
This is done every minute, and when the set parking time has elapsed, the display hand 10 returns to the reference position and displays 0.

E-2-5 Explanation about extra time Here, although it differs slightly depending on the country or region, even if the specified parking time has elapsed, if it is within a certain amount of time considering road conditions etc., it will be considered a violation. In many cases, systems are adopted in which this is not allowed, and this embodiment also uses this as the 30-minute margin time. In other words, indicator hand 1
0 means that after 0 minutes is specified, the clock is further advanced in the counterclockwise direction, and if the amount of increment is within 30 minutes in terms of time, it is not considered a violation.
When the display hand 10 advances to the -30 scale position, the underscale detector 22 sends a signal.
Since Us is output and the drive of the DC motor 2 is stopped, the vehicle must be moved before reaching the -30 position. Through these operations, the basic parking time setting and display and the remaining parking time are displayed.

A-2-6 Explanation of changes in time system, etc. Next, we will explain special cases and responses to changes in time system. First, during the set feed operation for setting the parking time (condition signal
When the next coin is inserted during the output of the number Ss, the counter 39 outputs a coin detection signal.
Mp is counted sequentially and output as signal A. On the other hand, delayed from this counting, the counter 44 also sequentially counts the carry pulse signal Sp and outputs it as a signal B. Here, when A=B, the comparison circuit 41 outputs a coincidence signal Cs to stop the set feed operation by the DC motor 1. Further, if a coin is inserted before the condition signal Ss is stopped outputting, the set release signal Cs is outputted, and the first frequency division pulse T is outputted from the frequency dividing circuit 34, the counter 39 outputs a coin detection signal again. Comparison circuit 4 that counts Mp
1, it is compared with signal B, and while A>B, set feed is performed by condition signal Ss, and A
When =B, the matching signal Cs causes the process to stop. The set feed for setting the parking time is performed in this way even when coins are continuously inserted, but when the display hand 10 advances to the position indicating the maximum scale 120 on the scale plate 11, the overscale detector 28 detects The signal Os is output, the counters 39 and 44 and the preset counter 42 are cleared, and the set feeding function by the DC motor 1 is stopped. Therefore, if the display hand 10 is at such a designated position, no further set feeding is performed even if a coin is inserted. However, in order to prevent trouble during actual operation, the display hand 10 should be set at 90.
If the indicated position of the minute is exceeded or if the counter 39 counts four pulses as the coin detection signal Mp, a means is taken to close the coin slot by electromagnetic means or pure mechanical means. .

Furthermore, if you insert a coin to set an arbitrary parking time and want to further extend the parking time while the remaining parking time is being displayed by the time operation, you can insert an additional coin at that point. For example, when 18 minutes is displayed as the remaining parking time, there are cases where you want to extend the parking time by an additional 30 minutes, 60 minutes, etc. However, if you insert one additional coin, for example, a coin detection signal Mp is input to the counter 39. signal A is output, and at this time B=0 and A
Since =1>B, the condition signal Ss is output. Thereby, the DC motor 1 becomes ready to rotate. At this time, the time measurement function is actually in progress, and the clock sending signal Ts is sent from the memory circuit 37.
If is being output, the DC motor 2 for clock forwarding will be rotating, and if the DC motor 1 rotates at this time, the rotation directions will be opposite, causing hunting and other abnormal phenomena, but the DC motor 1 side For memory circuit 37
Since there is an AND gate 48 which inputs the output and condition signal Ss from the terminal, the DC motors 1 and 2 will not operate at the same time. Therefore, immediately after the clock feed of the clock feed signal Ts of the previously operated DC motor 2 is completed, the DC motor 1 side starts driving. As a result, when the digital signal Dp is counted by the preset counter 42 and reaches the preset value N=30 in the same way as in normal setting operation, a carry pulse signal Sp is generated, and the comparator 41 outputs the signal Dp.
=B, the coincidence signal Cs is output and the set feed is stopped. As a result, the display hand 10 was advanced 360/n x 1/G x N degrees from the 18 minute indicated position, that is, 360/10 x 1/36 x 30 = 30 degrees.
It is set to the indicated position of 48 minutes, and a new time measurement operation for this 48 minutes is started. Therefore, if you want to extend the parking time again after a certain parking time has elapsed, by inserting an additional coin, the parking time will be faithfully displayed by adding the amount of time equivalent to the number of inserted coins to the remaining parking time at that time. can be done. Note that after a certain parking time has elapsed, the display hand 10 may indicate a margin time of 0 minutes or less, but in this case, the signal Zs is not output and the preset counter 42 is cleared. Therefore, the set feed is simply performed by the DC motor 1 until the signal Zs is output due to additional coin insertion, and after the display hand 10 reaches the 0 minute position and the signal Zs is output, 360/1 coin is output. A step of n×1/G×N degrees, that is, a step of 30 degrees is performed. That is, it is the same as the normal set operation.

Furthermore, we will consider how to respond to changes in the time system. Here, when setting 〓〓〓〓〓〓
From the formula 360/n×1/G×N representing the step amount and the formula 360/n×1/G representing the step amount during time measurement, the preset value N, frequency division value Y, tooth ratio G, detection The amount of step can be changed by changing the point n. Therefore, in the parking meter of the embodiment, if you want to change the time system to, for example, a maximum parking time of 2 hours and a 1-coin parking permit time of 1 hour, you can manually set the preset value N of the preset counter 42 to 60. Just change it. In other words, the amount of progress made by one coin is 360/10 x 1/3
6 x 60 = 60 minutes parking time will be set and displayed,
When measuring time, 1 per minute is used as in this embodiment.
The display is incremented in steps and the display is performed as specified. In addition, in a system that does not adopt the margin time system, the circuit configuration may be such that the underscale detector 22 is omitted and the initial time position detector 25 is also used to invert the signal state to produce the signal Us. Also, if you want to adjust the resolution during time measurement, you can do so by changing the frequency division value Y, and if you want to increase the stepping accuracy, you can do so by increasing the number n of detection points on the detection plate or by increasing the tooth ratio G. It can be easily achieved. In this way, adaptation to different time systems depending on the country or region can be easily achieved by changing the preset value N, frequency division value Y, tooth ratio G, detection point n, or changing the scale plate 11. be.

In addition, there are very few mechanical adjustment parts in the structure, and the power transmission mechanism is simple and has few parts to wear.
Since the control is performed by the electronic arithmetic control circuit 51, it is possible to achieve high precision, high reliability, and long life.

Japanese Patent Application No. 100472/1983 shows that the above-described operation can be performed under such a configuration.

E-3 Description of characteristic operation of the embodiment Therefore, the DC motor 1 according to this embodiment,
The second operation will be explained. First, paying attention to the rotational directions of the DC motors 1 and 2, if the DC motors 2 and 1 are being driven, they are rotated in a direction opposite to their own driving direction. Therefore, if the fields of the DC motors 1 and 2 are always magnetized, the DC motors 1 and 2 will act as generators when rotated in opposite directions. Regarding this point, since the DC motors 1 and 2 used in actual parking meters only need to be small and low-torque ones, permanent magnets are usually used as their field magnets.
There is no need to take any special magnetization measures. For example, when the DC motor 1 is being driven, the display hand 10 is moved clockwise.
On the other hand, the direct current motor 2 is rotated in a clockwise direction opposite to its driving direction by the transmission of the spur gears 5 and 4, thereby exhibiting a generator action. As a result, the DC motor 2
An electromotive force _E2 having a polarity opposite to that of the normal applied voltage V is induced between the armature coil terminals. This electromotive force E ₂ has a voltage value proportional to the rotation speed, and a part of it is regenerated to the power supply, but the remaining amount E ₂ ′ is E ₂ ′ = (R ₂ + r _D2 ) × i ₂ (However, R ₂ : Resistance value of load resistor 53, r _D
2 : resistance of the diode 55, _i2 : current), and this is consumed. Therefore, the drive energy of the DC motor 1 is not only consumed by the display mechanism, but also by driving the DC motor 2 as a generator, a part of the generated energy is regenerated into the power supply and is consumed by the resistor 53, so that the braking energy is reduced. becomes.

In this way, since the load resistor 55 is connected to the DC motor 2, when the voltage applied to the DC motor 1 is low, the output rotation speed is also small, so the electromotive force is reduced.
E ₂ also becomes smaller and the braking torque becomes smaller.
Conversely, when the applied voltage is high, the output rotational speed is also large, so the electromotive force E ₂ also becomes large, increasing the braking torque and making it possible to brake high-speed rotation.
Here, the braking torque due to this electromotive force E ₂ can be increased or decreased by adjusting the value of the load resistor 55, and thereby it is possible to suppress the increase in rotation due to voltage fluctuations or the like to below a certain value.

Further, even when the DC motor 2 is being driven, the DC motor 1 similarly acts as a generator, so that braking can be applied. In the end, the DC motors 1 and 2 are connected to the other DC motors 2 and 2, respectively.
Since the braking torque from 1 is applied, there is no overrun when stopping, and the indicator hand 1
Time display using 0 is highly accurate.

Furthermore, since time trigger circuits 58 and 59 are provided when the DC motors 1 and 2 are stopped,
〓〓〓〓〓
Reverse braking is applied. That is, for example, if the set signal Ss' is output and the DC motor 1 is performing a set feed operation, and the set signal Ss' is no longer output when the setting is completed, the falling of the set signal Ss' will trigger the time trigger circuit. 58 is triggered. As a result, the time trigger circuit 58 outputs a short time signal St. Therefore, by this time signal St, the drive circuit 3
8 operates to drive the DC motor 2 in the original driving direction. Therefore, after the set signal Ss' is stopped, the rotational energy that causes an overrun based on the moment of inertia ^GD2 of the DC motor 1 itself and the display mechanism is offset by the rotational energy of the forcibly driven DC motor 2, and thus After the set signal Ss' is stopped, the display hand 10 is instantly stopped at the appropriate position. Since a time trigger circuit 59 is also provided, even when the DC motor 2 side is stopped due to the stop of the clock feed signal Ts, reverse braking is similarly performed by the DC motor 1 operated by the time signal Tt.

Here, by adjusting the time constants of the time trigger circuits 58 and 59 and the pulse widths of the time signals St and Tt, the rotational energy due to inertia and the braking energy due to reverse braking can be made to substantially match.
The indicator hand 10 can be stopped at a proper position almost instantaneously. In this way, the timed trigger circuit 5
Since the motors 8 and 59 are attached to perform reverse braking, it is possible to stop the DC motors 1 and 2 at appropriate positions with higher accuracy in synergy with the means for generating braking energy that causes the DC motors 1 and 2 to act as generators.

Effects of the invention As mentioned above, this invention connects a load resistor to the DC motor that sets the display mechanism based on coin insertion and the DC motor that moves the display mechanism clockwise in the opposite direction, and connects one DC motor to the other. When the motor is driven, the other DC motor is forcibly driven as a generator and the super power is consumed in the load resistance, at the same time.
By providing a control circuit, when one DC motor stops driving, the other DC motor is driven for a certain period of time and reverse braking is performed using its rotational torque.The synergistic effect of the generator action and reverse braking allows for even more precise optimization. This has effects such as being able to stop in position and displaying time with high accuracy.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a perspective view, and FIG. 2 is a block circuit diagram. 1-2...DC motor, 29...Parking time display device, 32...Coin detection device, 33...Reference time pulse generator (clock device), 51...Arithmetic control circuit, 52-53...Load resistance , 58-59...
Timed trigger circuit (control circuit). 〓〓〓〓〓

Claims (1)

[Scope of utility model registration request] A coin detection device that outputs a coin detection signal Mp for each coin, a clock device that outputs a clock pulse t with an isochronous width, a drive unit that reciprocates a display mechanism, and a displacement amount of the display mechanism as a digital signal Dp. A parking time display device that outputs a signal Zs for outputting and defining a reference position; the coin detection device, the clock device, and the parking time display device are connected to an input side, and the drive unit is connected to an output side for regulation. When the coin is inserted, the coin detection signal Mp,
The drive unit for the display mechanism is configured to calculate and display the required parking time based on the digital signal Dp and the signal Zs, and after displaying the setting, calculate the remaining parking time based on the clock pulse t and display the remaining parking time corresponding to the elapsed time. and an arithmetic control circuit for controlling the operation, wherein the drive section is configured to have a predetermined speed ratio on the drive shaft of the display mechanism as a DC motor that causes the display mechanism to be set and a DC motor that causes the display mechanism to advance in time. A load resistor is connected between the terminals of each DC motor, and when one DC motor is driven, the other DC motor is forcibly driven as a generator. A control circuit is provided to cause the electromotive force to be consumed by the load resistor to apply braking, and to drive the other DC motor for a certain period of time in response to a drive stop signal for one of the DC motors. A parking meter characterized in that when the drive of the DC motor is stopped, reverse braking is applied by the rotational torque of the other DC motor.