JPS636764Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for detecting erroneous display in an interlocking display screen.

In buses and other vehicles, each display curtain installed on the front, back, side, etc. of the vehicle for displaying destinations, etc. is rotated at the same timing in the winding direction or rewinding direction to sequentially display a predetermined display. In type-linked display curtains, misalignment often occurs due to factors such as dimensional accuracy between the display curtains or mismatch in the rotational speed of the motors that drive the display curtains, resulting in erroneous display.

As a countermeasure to the above, it has already been proposed, for example, in Utility Model Application Publication No. 52-46683, etc., to provide a display means for detecting erroneous display in parallel with the display means for detecting the stop position on each stage of the display screen. has been done.

However, in the case where a display means for detecting erroneous display is provided in each stage, for example, when a cutout is made in a part of the subtitles and a switch is activated by this, as in the previous application, a large amount of processing is required. In addition to requiring a large amount of expense, the processing reduces the strength of the curtain, making it easy to damage the area around the notch, which can lead to new erroneous displays. Furthermore, even in the case of photoelectric detection with a light shielding part on the subtitles or in the case of affixing metal foil to the subtitles and activating a proximity switch, a large amount of expense is required as described above due to the attachment of the light shielding part or metal foil. .

Therefore, in order to improve the above-mentioned drawbacks, the present application provides display means for detecting erroneous display at every other row.
The object of the present invention is to provide a device for detecting erroneous display in an interlocking display screen, which can achieve the same effect at half the cost of the conventional type.

Embodiments of the present application will be described below with reference to the drawings.

FIG. 1 shows display curtains A, B, and C having the same structure and installed on the front, back, and side surfaces of a vehicle, respectively.

Each display screen is wound around winding shafts 1 and 2 on both sides,
Although not shown, both winding shafts are connected to a drive motor shaft via belts or gears, and are configured to be able to wind up or rewind the display screen by rotating the motor in forward or reverse directions.

Also, as shown in FIG. 2, at one end of each display curtain A, B, C, winding prevention holes 3 _a1 , 3 _b1 , 3 _c1 and 3 _ao , 3 _{bo are} provided at the beginning and end of the winding. ,3 _co ,
Stop holes for each stage 4 _a1 ~ 4 _ao , 4 _b1 ~ 4 _bo , 4 _c1 ~
₄ Drill a hole in each hole.

Furthermore, in the first row there are 5 _a1 , 5 _a3 , 5 _a5 , 5 _a7 ...
5 _b1 , 5 _b3 , 5 _b5 , 5 _b7 ...and 5 _c1 , 5 _c3 , 5 _c5 ,
5 _c7 ... are each drilled in a manner parallel to the stop hole.

For these winding prevention holes, each stage stop hole, and false display detection hole, there are display windows 6 provided on the display screen between the winding shafts 1 and 2, as shown in FIG. A switch will be placed at the bottom of the adjacent display screen. This switch is usually pressed at the bottom of the display curtain.
The actuator is located on the NO (normally open) side, but when the actuator fits into the winding prevention hole, each stage stop hole, and the false display detection hole, it protrudes above each of the holes to the NC (normally closed) side. It is set to switch to . The micro switches 7a, 7b, and 7c are for winding prevention detection for each direction curtain A, B, and C, and 8 for stop detection for each stage.
a, 8b, 8c are 9a, 9 for detecting incorrect display.
b and 9c each function.

Next, FIG. 3 shows a schematic wiring diagram for explaining the operation of the interlocking display curtain including the erroneous display detection device according to the present application, and the series of operations will be explained below based on this wiring diagram.

First, each display curtain A, B, C is at the beginning of the volume A ₁ , B ₁ ,
A case will be explained in which the winding machine is located at _C1 and the start operation is performed in the winding direction (forward direction).

In this case, each stop switch 8a, 8b, 8c and each winding prevention switch 9a, 9b, 9c are connected to each corresponding stop hole _4a1 , _4b1 , _4c1 and each winding prevention hole _5a1 , 5. _b1 and 5 are compatible with _c1 , and their contacts are on the NC side. Then, when the non-lock type feed switch S _G is closed, the power +B
is kept from relay coil RY _G to relay contact Y _K 1
A closed circuit leading to ground through -C and a power supply +B
is a closed circuit that connects between 2 and 3 of the keep relay coil _RYK to ground via each backflow blocking diode _D10a , _D10b , _D10c and between NC and C of each winding prevention switch 9a, 9b, 9c. I can do it.

Relay contact Y _G is activated by energizing relay coil RY _G.
The a contact of is closed, and although detailed explanation is omitted, each motor control circuit 11a, 11 including some signal control circuits.
The motor driving function built in the display curtains A, B, and C is activated, and the motors 12a, 12b, and 12c, which are linked to the winding shafts of the display curtains A, B, and C, start winding.

On the other hand, when the keep relay coil RY _K is energized between 5 and 6, the keep relay contact Y _K is switched between 7 and C, and the energization of the relay coil RY _G is stopped, but then the stop switches 8a, 8b, and 8c are turned on. Each motor control circuit 11a, 11b,
A self-holding circuit built into 11c operates to maintain the rotational driving state.

In addition, when the winding start position is exceeded, each winding prevention switch 9a, 9b, 9c switches to NO contact,
Even if 1-C of the keep relay coil Y _K for energizing the relay coil RY _G is open, each backflow blocking diode D _13a is connected from the b contact which is closed when the contact Y ₁ of the relay coil RY ₁ is not activated. , D _13b , D _13c
and each winding prevention switch 9a, 9b, 9c.
The closed circuit between NO and C allows restarting after stopping each stage in the middle.

Next, the winding operation proceeds sequentially, and each display curtain A, B,
The case where C is located at A _o , B _o , and _Co at the end of the volume will be explained.

In this case, each winding prevention switch 9a, 9b, 9
c are all on the NC side, and the keep relay coils _YK and 7-C are closed, so it is not possible to drive each motor in the forward direction even if the feed switch S _G is operated.

On the other hand, a return switch is used to reversely rotate each motor 12a, 12b, 12c and operate it in the rewinding direction.
When S _B is operated, a closed circuit is formed between 7 and C of relay coil SY _B and keep relay coil Y _K , so relay contact is activated by energizing relay coil RY _B.
Close the a contact of _YB and each motor control circuit 11a,
At 11b and 11c, the a contacts can be self-maintained, and each motor 12a, 12b, 12c can be driven in reverse. At the same time, the keep relay coil is energized from between 2 and 3 of the keep relay coil _RYK through the backflow blocking diodes D _10a , D _10b , D _10c and the NC side contacts of the winding blocking switches 9a, 9b, 9c. . For this reason, keep relay coil contact Y _K between 7 and C is open, and thereafter relay coil RY _B is energized by each reverse flow from contact B, which is contact Y ₁ of relay coil RY ₁ , which normally does not operate and is closed. Blocking diode D _13a ,
D _13b , D _13c and each winding prevention switch 9a, 9b,
The closed circuit extending between NO and C of 9c is configured to enable restarting after stopping each stage in the middle.

Furthermore, a mechanism for detecting erroneous display, which is the main subject of the present application, will be explained next.

Let us now consider the case where the winding operation in the forward direction is performed as described above, and the display curtains A, B, and C stop at the correct display positions A ₃ , B ₃ , and C _{3 ,} respectively.

In this case, the actuators of the stop switches 8a, 8b, 8c are fitted into the stop holes _4a3 , _4b3 , _4c3 , and the actuators released from pressure protrude above the display screen to open each switch. All contacts are connected to the NC side. Similarly, the switches 7a, 7b, and 7c for detecting incorrect display are connected to each error display detection hole 5a _.
Compliant with ₃ , 5 _b3 , 5 _c3 and all connected to the NC side.

Therefore, the false display detection switches 7a, 7b, 7c
Since the NO side contacts of both are in an open state, the power supply +B is supplied as the "H" input to the mismatch circuit [Exclusive (abbreviated as Ex-OR)] through each resistor R _a , R _b , R _c . , the Ex-OR circuit outputs "L" when all inputs are "H" or "L", so in this case, the "L" output is taken out as one of the inputs to the next stage NAND circuit. On the other hand, since the NO side contacts of the respective stage stop switches 8a, 8b, and 8c are also all open, an "H" input from the power supply voltage is applied as one of the inputs to the NAND circuit via the resistor _Rd . Also, the reset switch S _R is normally open.
A is contact Y ₂ of relay RY ₂ , which is energized by the operation of
“H” through the resistor R _e connected to one end of the contact
The input is provided as one of the NAND inputs.
As a result, an "H" input is given to each NAND circuit, so an output "H" is taken out, which is converted to "L" by an inverter (NOT) and sent to the base of the transistor T _r via a protective resistor r. However, the transistor does not operate and remains OFF, waiting for the next operation.

Next, among the display curtains, for example, although display curtains A and B stopped at display positions A ₃ and B ₃ ,
Let us consider a case where only the display curtain C does not stop at the desired stop position _C3 for some reason, but stops at _C4 , which is one step ahead. In this case, the actuator of the erroneous display detection switch 7c on the display curtain _C4 is pressed against the lower surface of the display curtain, does not operate, and is connected to the NO contact side. Therefore, one end of the resistor R _c is grounded through this contact and an "L" input is given to one of the Ex-ORs, so the Ex-OR output becomes "H".
All NAND inputs become "H" and "L" output is taken out, which is converted to "H" by an inverter (NOT).
Transistor T _r via protection resistor r
The transistor T r becomes conductive as the input of the transistor T _r .

As a result, relay coil RY ₁ is energized and its contacts
Y ₁ is connected to the a contact side and the buzzer B ₂ connected in series sounds to issue an alarm.

Also, since this relay contact _Y1 is connected in series with the relay coils RY _G and RY _B used for winding and unwinding, the contact _Y1 changes from the normal B contact side to the A contact side. Switch to open the circuit and prevent further action.

Therefore, in order to release these, it is necessary to align each display curtain to the same position by some means and make all Ex-OR inputs the same, either "H" or "L". In order to make these match, it is necessary to manually or forcibly do it, or, although not shown, each motor 12a, 12
This can be done by individually driving rotations b and 12c, or by operating the reset switch S _R.

Each winding prevention switch 9a, 9b, 9c is set to NO.
At any position other than the winding start or winding _end connected to _the
D _14a , D _14b , D _14c and each winding prevention switch 9
Relay coil RY ₂ is energized via NO-C of a, 9b, and 9c. This closes the normally open A contact of relay contact _Y2 , grounding one end of the resistor _Re , and causing one of the NAND inputs to become "L".

Therefore, the activated transistor T _r is again
OFF, the buzzer _Bz is stopped, and in conjunction with this, although not shown, each display curtain is continuously fed to the winding end or winding start position, and all winding prevention switches 9a, 9b, 9c are turned off at that position. fits into the winding prevention hole and is connected to the NC side, so that they stop in unison.

In the above embodiment, each position detecting means is composed of a hole drilled on the display screen and a switch mechanism arranged at the bottom surface of the screen that operates the actuator depending on the presence or absence of the hole. It is also possible to use a combination of a light-shielding area and a photoelectric switch that detects it, or a combination of a metal foil attached to the subtitles and a proximity switch that detects it.

Furthermore, the circuit configuration for detecting erroneous display based on the signals obtained by each of these position detecting means is not limited to the above-mentioned embodiment using Ex-OR and NAND circuits, but may be any known circuit that operates in the same manner without departing from the gist of the present application. Of course, it can be changed arbitrarily by replacing the logic circuit.

As described above, the erroneous display detection device of the present invention includes a plurality of display curtains each having a stop indicator means for each stage of each display curtain, and a display curtain in which an error display indicator means is provided at every other stage in parallel with the stop indicator means for each stage of each of the plurality of display curtains. Each of the stop detection means and the erroneous display detection means is arranged at a position adjacent to the travel path of the display screen and detects the presence or absence of the stop marking means and the erroneous display marking means, respectively, and each of the stop detection means The stop signal generation circuit generates a binary code output "H" or "L" when the erroneous display is activated, and the binary code output "H" is generated by the operation of each of the above-mentioned erroneous display detection means.
or "L" respectively, and when all the above-mentioned stop detection means are activated and a signal is emitted from the stop signal generation circuit, all of the above-mentioned erroneous display signal generation circuits. a logic circuit that determines whether or not they match and generates a matching detection signal; and a control circuit that activates an alarm or other display means if the detection signals from the logic circuit do not match. A device for detecting erroneous display in an interlocking display curtain is characterized by:

As a result, if one of the display curtains shifts by one step due to factors such as the dimensional accuracy of each display curtain or mismatch in the rotational speed of the motor that drives it, this can be detected promptly and notified with an alarm, etc. The marking means for detecting erroneous display, which was conventionally applied to each row, can now be applied to every other row, which reduces the work required to install it by half, contributing to work efficiency and cost reduction. .

[Brief explanation of the drawing]

The drawings all show examples of the present application, and FIG. 1 is a plan view of each display curtain, FIG. 2 is a perspective view for explaining the same, and FIG.
The figure is a schematic wiring diagram illustrating the operation of the interlocking display screen including the erroneous display detection device of the present application, and FIGS. 4 and 5 are circuit diagrams showing the operation of the erroneous display detection device that is the essential part of the present application. Explanation of numbers, 1, 2... Winding shaft, 3 _a1 , 3 _ao , 3 _b
1 , 3 _bo , 3 _c1 , 3 _co ... Winding prevention hole, 4 _a1 to 4 _ao ,
4 _b1 ~ 4 _bo , 4 _c1 ~ 4 _co ...Stopping hole, {5 _a1 , 5 _a3 ,
5 _a5 , 5 _a7 , 5 _ao , 5 _b1 , 5 _b3 , 5 _b5 , 5 _b7 , 5 _bo ,
5 _c1 , 5 _c3 , 5 _c5 , 5 _c7 , 5 _co }...Mistaken display detection hole,
6... Display window, 7a, 7b, 7c... Winding prevention detection switch, 8a, 8b, 8c... Stop detection switch, 9a, 9b, 9c... Erroneous display detection switch,
11a, 11b, 11c...Motor control circuit, 12
a, 12b, 12c...Motor, A, B, C...Display screen, _Bz ...Buzzer, _D10a~c , _D13a~c , _D14a~c ...Backflow blocking diode, Ex-OR...Discrepancy circuit (Exclusive- OR), RY ₁ , RY ₂ , RY _B , RY _G ,
RY _K ...Relay coil, R _a~e , r...Resistance, S _B , S _G ,
S _R ...switch, Y ₁ , Y ₂ , Y _B , Y _G , Y _K ... relay contact, NAND... NAND circuit, NOT... NOT circuit, T _r ... transistor, +B... power supply.

Claims (1)

[Scope of Claim for Utility Model Registration] Each of a plurality of display curtains, each display curtain having a stop indicating means for each stage and a false display indicating means parallel to said means at every other stage; Each of the stop detection means and the erroneous display detection means are arranged adjacent to the travel path and detect the presence or absence of the stop display means and the erroneous display display means, and each of the stop detection means is activated. When the stop signal generation circuit generates a binary code output of “H” or “L” in the case of an error, the binary code output is “H” by the operation of each of the above-mentioned erroneous display detection means.
or "L" respectively, and when all of the above-mentioned stop detection means are activated and a signal is issued from the stop signal generation circuit, all of the above-mentioned erroneous display signal generation circuits are activated. A logic circuit that determines whether or not they match and generates a compatible detection signal, and a control circuit that activates an alarm or other display means if the detection signal from the logic circuit does not match. A device for detecting erroneous display in interlocking display curtains.