JPS6127035Y2 - - 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, parking meters often have different time systems for the relationship between the amount of coins inserted and the amount of parking time depending on the region or country in which they are used. It is necessary to replace and adjust many gears, cams, etc., and it is not easy to change to a different time system.

〓〓〓〓〓
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 and electronic means has been proposed in Japanese Patent Application No. 100472/1982 (see Japanese Patent Application Laid-Open No. 24688/1983). 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 and then stops, which tends to cause problems such as stopping at a position where the display hand has significantly overrun. Moreover, it is desirable that the setting display by inserting a coin be performed in as short a time as possible, and for this reason, the rotation speed of the motor is set to be high.
The overrun phenomenon is increased. In addition, when displaying the remaining parking time, there are many activations and stops, and due to its function, it stops immediately after activation, so the rotational torque due to inertia is large, causing an overrun phenomenon. It's easy to do. Further, when a storage battery is used as a power source, the voltage is high when the battery is sufficiently charged due to large voltage fluctuations, and becomes low when the battery is not yet used. 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 This invention largely employs electrical and electronic means such as arithmetic control circuits, and uses a DC motor that moves the display mechanism in sets based on coin insertion, and a DC motor that moves the display mechanism in time. A control circuit is provided, whereby when one DC motor stops driving, the other DC motor is driven for a certain period of time, and reverse braking is applied by the rotational torque of this DC motor, thereby preventing the DC motor from overrunning in order to stop. It is configured so that there is no such thing.

Embodiment of the invention An embodiment of the invention will be explained 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 attached to the transmission shaft 6 to measure the amount of step of the transmission shaft 6 and to control stopping of the DC motors 1 and 2 at appropriate positions. There is. 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,
Specific means of this display needle feed control detector 16 and
A photoelectric conversion means using a photodiode or a phototransistor placed opposite the detection hole 13 is employed. 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 the 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. Cam disk 21 fixed to shaft 9 and this cam disk 2
Underscale detector 22 using a micro switch that is opened and closed at a predetermined timing by 1.
It is composed of. In addition, the detection device 18
signal Zs so that the parking time can be set correctly to the specified time using the reference value (time zero).
is output through a buffer circuit 23, and is composed of a cam disk 24 fixed to the drive shaft 9 and an initial time position detector 25 using a micro switch that is opened and closed at a predetermined timing by the cam disk 24. has been done. Further, the detection device 19 sends a signal Os for regulating the display position to the buffer circuit 2 in order to prevent the display hand 10 from rotating further than the maximum permissible 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 slits and 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, numeral 33 is a reference time pulse generator which is composed of a known crystal oscillation element or tuning fork oscillation element and an electronic circuit, and serves as a clock device by outputting a clock pulse t having a constant period.
The output clock pulse t is input to a frequency dividing circuit 34 which outputs a frequency divided pulse T every time the frequency division value Y reaches this frequency division value Y. This frequency dividing circuit 34 is composed of a preset type counter having a known clear function, and its clear terminal CL is connected to two OR gates 3.
Underscale detector 22 via 5, 36
A signal Us based on is input. and,
Frequency division pulse T output from this frequency division circuit 34
A memory circuit 37 such as a flip-flop is provided which inputs the clock signal Ts, which is an output from the Q terminal of the memory circuit 37, to the motor 2.
The signal is input to a drive circuit 38 that drives the signal.
Further, the frequency-divided pulse T is applied to the OR gate 36
is also entered.

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 a well-known counter with a clear function.
The signal Os based on the overscale detector 28 is input to the clear terminal CL via the OR gate 40. Further, the signal A from the counter 39 is outputted as a binary signal or a binary coded decimal signal indicating the number of coins inserted, and is inputted to a comparison circuit 41 constituted by a group of gate circuits and the like. The display needle feed control detector 16
A preset counter 42 is provided which receives as input a digital signal Dp based on . here,
The preset counter 42 has its preset value N
can be manually changed and set, and the digital signal Dp is inputted via an AND gate 43, and when the count number of the digital signal Dp reaches a preset value N, a carry pulse signal is generated.
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 from Zs' and the OR gate 40 is input to the clear terminal CL of the preset counter 42 via an OR gate 46. 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 the OR gate 56, and the clock feed signal Ts from the time trigger circuit 58, which is a control circuit, inputs the set feed signal Ss' from the AND gate 78. A time signal St is input. On the other hand, a time trigger circuit 59, which is a control circuit that outputs a time signal Tt based on the clock feed signal Ts, is provided.
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 margin 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 5 equal parts, and 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 following (this range is the parking permission period)〓〓〓〓〓
is the signal Zs 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.

A-2-1 Initial state In the initial state where the indicator hand 10 is stopped, the indicator hand 10 indicates the scale mark -30, so the signal Us is output and the frequency divider circuit 43 and the memory circuit 37 are cleared, and the DC motor 2 does not operate. On the other hand, since the position of the indicator hand 10 is outside the parking permission time zone, the initial time position detector 2
No signal Zs is output from the AND gate 43
is prohibited, and the following preset counter 4
2 etc. will not operate, and DC motor 1
does not operate. Therefore, the indicator hand 10 does not advance in any step. In addition, 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 a digital signal Dp in synchronization with the detection hole 13 of the detection plate 14, and on the other hand, the underscale detector 22 outputs the signal Us. will be stopped. Here, the digital signal Dp is input to the preset counter 42;
Since it has been cleared by Zs', the preset counter 42 also does not perform any counting operation.

E-2-3 Parking time setting display operation In this way, the DC motor 1 for setting feed 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 The signal Zs is output by By outputting this signal Zs, preset counter 4
2 functions to count the digital signal Dp. Here, an AND gate 43 is inserted on the input side of the preset counter 42, but 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 cause only the counting operation of the digital signal Dp to be performed.
Then, the feed operation by the DC motor 1 continues, and in response, the digital signal Dp
are sequentially output and counted by the preset counter 42. This count value is the preset value N
When reaching , a carry pulse signal Sp is generated,
Clear the contents of self and counter 4
4 is input. 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. occurs, the counter 44 counts up by 1, and the signal B
This will result in This signal B is compared with the signal A from the counter 39 by the comparison circuit 41, and if the value of B is equal to the value of A, then the
A match signal Cs is output from the comparison circuit 41,
AND gate 48 is prohibited and DC motor 1
At the same time, the coincidence signal Cs is converted into a set release signal Cs' by the differentiating circuit 47, and the counters 39, 44 and preset counter 42 are cleared. 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. It will rotate by N, N×2, N×3, N×4 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, since n=10, G=36, and N=30, the setting display is performed for a step of 30 degrees per coin, that is, for a parking time of 30 minutes. As a result, if coins are inserted continuously, the setting display will be 30 minutes if 1 coin is inserted, and 60 minutes if 2 coins, 3 coins, or 4 coins are inserted.
The settings will be displayed for minutes, 90 minutes, and 120 minutes.

E-2-4 Display operation of remaining parking time The operation after the parking time setting is displayed as specified by the display hand 10 by inserting a coin will be explained. In this set state, at least the indicated position of the display hand 10 is within the parking permission time zone, and the comparator circuit 41
The condition signal Ss is not outputted either, and as a result, the frequency divider circuit 34 is released from the clear state and sequentially counts the clock pulses t from the reference time pulse generator 33 until the counted value reaches the frequency division value Y. Output one frequency-divided pulse T. 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 display needle feed control detector 16
The digital signal Dp is output from the same as at the time of setting. When one pulse of this digital signal Dp 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 display hand 10 moves counterclockwise every time corresponding to Y times the period tω of the clock pulse t (that is, the frequency division pulse T) in a physical quantity (angle) of 360/n×1/ This will result in an advance of G degrees. Here, T=1
(minutes), n=10, G=36, so 1 per minute
The display hand 10 advances counterclockwise in degrees. For example, if a parking time of 30 minutes is set, the display hand 10 advances counterclockwise.
The remaining parking time will be displayed in order, such as minutes, 28 minutes, etc. Such an operation is performed 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 and region, even after 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, a system that does not have a free time is adopted, and in this embodiment, this is also adopted as a 30-minute margin time. That is, the display hand 10
is further counterclockwise after indicating 0 minutes, and if the amount of increment is within 30 minutes in terms of time, it will not be 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, if the next coin is inserted during the set feed operation for setting the parking time (while the condition signal Ss is being output), the counter 39 will receive 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, and the DC motor 1
Stop the set feed operation. Also,
The output of the condition signal Ss is stopped and the set release signal is activated.
A coin is inserted before Cs' is output and the first divided pulse T is output from the frequency divider circuit 34.
If the coin detection signal Mp is counted again, the counter 39 counts the coin detection signal Mp and compares it with the signal B by the comparison circuit 41. While A>B, the set feed is performed by the condition signal Ss, and A=B.
Then, it will be stopped by the coincidence signal Cs. The set feed for parking time setting is performed in this way, including when coins are continuously inserted, but when the display hand 10 reaches the maximum scale on the scale plate 11.
120, the overscale detector 28 outputs a signal Os, the counters 39, 44 and the preset counter 42 are cleared, and the set feed 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, if the indicator hand 10 exceeds the indicated position for 90 minutes or the counter 3
9 counts four pulses as the coin detection signal Mp, the coin slot is closed electromagnetically or purely mechanically.

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. As a result, 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 within the 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, by inserting additional coins, the signal Zs
The set feed is simply performed by the DC motor 1 until the output of , and after the display hand 10 reaches the 0 minute position and the signal Zs is output, the speed is 360/n x 1/G x N degrees per coin, i.e. A step of 30 degrees is performed. That is, it is the same as a normal set operation.

Furthermore, we will consider how to respond to changes in the time system. Here, the preset value N, minute The amount of advancement can be changed by changing the circumferential value Y, the tooth number ratio G, and the detection 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/G
× 60 = 60 minutes of 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.

Since the 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, the drive circuit 38 is operated by this time signal St to drive the DC motor 2 in the original drive direction. Therefore, the set signal
DC motor 1 itself and display mechanism after stopping Ss′〓〓〓〓〓
The rotational energy that causes an overrun based on the moment of inertia ^GD2 of is offset by the rotational energy of the forcibly driven DC motor 2, so that the indicator hand 10 is instantly stopped at the proper position after the set signal Ss' is stopped. That will happen. 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, the direct current motors 1 and 2 can be synergized with the means for generating braking energy by acting as a generator, thereby making it possible to stop the motors at appropriate positions with higher precision.

Effects of the invention As mentioned above, this invention provides a control circuit for 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. When the DC motor stops, the other DC motor is driven for a certain period of time and its rotational torque is used to apply reverse braking, so it is possible to apply sufficient braking energy to the DC motor to stop it, thereby eliminating overrun phenomena and achieving highly accurate timing. This has effects such as being able to perform display.

[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, 58-59...Time 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 control circuit is provided independently in mesh with the provided gear, and a control circuit is provided for driving the other DC motor for a certain period of time in response to a drive stop signal for one of these DC motors, and one of the DC motors is 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.