JPH033807A - Control mode selector device - Google Patents

Abstract

PURPOSE:To improve safety by providing an automatic control device for a circulating movable rack characterized in the above device which is constructed so that only when a motor is stopped, a mode selector signal can be transmitted; and after a pulse is obtained from a mode selector signal to once initialize a control mode, a mode is automatically selected. CONSTITUTION:An AND gate G1 is inserted for controlling a mode selector switch sw. In this arrangement, when one mode is completed, the output of OR gate 7 becomes L, and the output of an inverter G11 becomes high, so that the AND gate G1 is capable of transmitting the output of sw to the input IN of a monostable multivibrator 2. Accordingly, by operating the switch sw, the monostable multivibrator is forced to output a pulse with a designated time width, initialize the first and second control circuits 6, 7 through OR gates G2, G3 and operate a delay circuit 3. After the lapse of a delay time, the mode is automatically switched.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the earlier patent application No. 35 of 1988, entitled "
A device that uses a combination of the "Moving Shelf Automatic Control Device" (hereinafter referred to as the first control circuit) and the earlier patent application No. 36 of 1988, titled "Moving Shelf Automatic Control Device" (hereinafter referred to as the second control circuit). The present invention relates to a device capable of switching between a first control circuit and a second control circuit as necessary.

During use, when switching between the first control circuit and the second control circuit described in 1., each input of the first driver DRI, which determines the operation (onoff) of the motor, and the second driver DR2, which determines the rotation direction. Connect to the first control circuit or the second control circuit.
It would be possible to switch the control circuit using a switch, but problems may occur. For example, the first control circuit (
While operating in the first mode), the second control circuit (second mode)
If the up switch SU or down switch SD of the mode) is switched, the second control circuit is set to operate the motor, so the motor is activated at the same time as the mode is switched, and the movable shelf rotates. Therefore, it is very dangerous to rotate the movable shelf indefinitely.

Also, if you accidentally switch the mode while driving,
There is a problem in that the direction of rotation of the motor may suddenly reverse, causing accidents such as items stored in the movable shelf falling off the shelf or damage to mechanical parts.

Therefore, in order to eliminate the above-mentioned problems, the present invention generates a pulse by touching the mode changeover switch, returns both the first control circuit and the second control circuit to their initial states with this pulse, and then switches the operation mode to automatic. so that it switches to
In addition, the present invention provides a device that generates pulses only when the motor is in a stopped state, thereby enabling safe switching of operating modes.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows a large number of movable shelves (IK, 2, 3, 4, 5, 6K) connected in a loop using endless chains, etc., and circulated by a motor (not shown). This is how it was done. 8P is a predetermined stop position at which each movable shelf (nk) is stopped.

FIG. 3 is a circuit diagram of the present invention for switching the operating modes of a first control circuit and a second control circuit that automatically control the circulating type movable shelf shown in FIG. 1.

When the number of the desired movable shelf is set, the first control circuit (first mode) 6 selects a rotation direction (U
The circuit is configured to automatically select the position (P or DOWN) and move the desired movable shelf to the stop position SP. Δ-IN is an input that sets the entire circuit to its initial state. Δ】 is the first driver DR1, the first relay RC
1, (for motor on/off control), drive A2
is an output that drives the second driver DR2 and the second relay RC2 (for setting the rotation direction of the motor).

The second control circuit (second mode) 7 continuously rotates in the set direction at the same time as setting the rotation direction (UP or DOWN), and when stopping the desired movable shelf at a predetermined stop position SP, The circuit is configured to apply a stop signal before the movable shelf reaches the stop position SP. B-I
N is an input that sets the entire circuit to its initial state. B
] is the first driver DP1. B2 is the output that drives the second driver DR2 and second relay RC2 (for setting the rotational direction of the motor).

Reference numeral 1 denotes an initial state setting circuit, which generates an output voltage of the "I(" level) only at the moment when the power is turned on, and controls the first control circuit 6.
．． Second control circuit 7. Wiring is performed to set each circuit of the T-type FF (flip-flop) 4 to an initial state.

In the switch SW, one contact is connected to VDD,
The other output side contact is connected via a resistor R to VSS and the input of the AND gate G1.

The output of AND gate Gl is connected to the input IN of monostable multibi break 2, and the output Q of this monostable multibi break is connected to OR gate G2. -IN to each initial state setting input of the first control circuit 6 and second control circuit 7 via G3
and B-IN and the input IN of the delay circuit 3, respectively. An output Q of the delay circuit 3 is connected to a clock input T of a T-type FF (flip-flop) 4. This T
In the type FF4, the output Q is inverted every time a pulse is applied to the clock T, and the output Q is connected to the input of the inverter G4.

5 is an illuminated mode display device, AM indicates the first mode, BM indicates the second mode, and each input is connected to the output Q and Q bar of the T-type FF, respectively.

One input of the AND gate G5 is connected to the output Δl of the first control circuit 6, and the other input is connected to the output of the inverter G4. One input of AND game 1-G6 is the second
Connected to the output B1 of the control circuit 7, and the other input is a T-type FF.
It is connected to the output Q of 4. AND gate G5 and G
Each output of 6 is connected to the first driver DR via OR gate G7.
] and the inputs of AND games 1 to G] via inverter Gll. One input of the AND gate G8 is connected to the output Δ2 of the first control circuit 6, and the other input is connected to the output of the inverter G4. ΔN +
) One input of gate G9 (output B of J second control circuit 7
2, and the other input is connected to the output Q of the Go-type FF4. AND game h Each output of G8 and G9 is OR
It is connected to the human power of the second driver DR2 via GIO1 to GIO.

Next, the operating state will be explained based on FIG. 2 showing voltage waveforms at various parts of the third section showing an embodiment of the present invention.

Time TO is a state in which the first control circuit (first mode) is operated.

Time T1 is an example in which the star 1-circuit of the second control circuit (second mode) is erroneously turned off while the first control circuit (first mode) is operating.

Time T2 is when the operation in the first mode ends.

Time T3 is the state when the mode changeover switch SW is touched after the operation in the first mode is completed. At this time, the output of OR gate G7 is at "L" level, so the output of inverter Gll is at "H" level, and AN
Since the D gate G1 is in a state where it can transmit the output of the switch SW to the manual input IN of the monostable multivibrator 2, the monostable multivibrator 2 generates a pulse with a predetermined time width and outputs the output from the OR gate 1-G2 and G3. 1st through
The control circuit 6 and the second control circuit 7 are returned to their initial states, and the delay circuit 3 is activated.

Time T4 is when the output Q of the delay circuit 3 is inverted from the rLJ level to the rHJ level, and the pulse is transmitted to the T-type FF4.
, the output Q is inverted and the mode state is automatically switched from the first mode (first control circuit) to the second mode (second control circuit).

Assuming that the control mode is switched only with a switch without using the "control mode switching device" of the present invention, as can be understood from the voltage waveform in FIG. 2, when the mode is switched between times TO and D, If the movable shelf that was rotating stops at that point without receiving a stop command, and the mode is switched between time T' and T2, the direction of rotation of the movable shelf may suddenly reverse, and Switching the mode between T3 and T3 is dangerous because an unexpected situation may occur, such as a stopped movable shelf starting to move without a start command.

In the example, an AND gate was used to control the output of the mode changeover switch, but other methods may also be used.
OR gate, NAND gate, exclusive sieve NOR
A gate or analog switch or the like may also be used.

In the embodiment, the mode is changed every time one switch is touched, but the T shown in the embodiment
Instead of type FF (flip-flop) 4, R-3 type FF (
switch SW, AND gate G1 . Monostable majibye break 2. The delay circuits 3 are each made into two pieces, and the outputs of the two monostable multivibrators are combined into one signal using an OR gate.
2 and 63, and the two switches SW are separately used for the first mode and the second mode.

In the present invention, the mode can be switched only when the motor is in a stopped state, and when the mode changeover switch SW is touched, the first control circuit (first mode) is first switched.
6 and the second control circuit (second mode) 7 are returned to their initial states, and then the mode is automatically switched. Therefore, it has a practical effect as a safe mode switching device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the arrangement of rotating movable shelves. Figure 2 is the 3rd
FIG. 3 is a diagram showing voltage waveforms of various parts of the control circuit shown in the figure. FIG. 3 is a control circuit diagram showing one embodiment of the present invention. 1, 2, 3, 4. , 5, and 13 have mobile shelves, S
P is a predetermined stop position where the movable shelf (nk) stops, l is an initial state setting circuit, 2 is a monostable multi-bi break, 3 is a delay circuit, 4 is a T-type FF (flip-flop), 5 is a mode display device, 6 is a first control circuit (first mode), 7 is a second control circuit (2,000th mode), SW is a mode changeover switch, G1G5. G6. G8. G9 is a two-person AND game 1-1G2. G3. G7. G], O is 01(
Game-1-1G4. G11 is an inverter, DPI is a first driver, DR2 is a second driver, RCI is a first relay, RC2 is a second relay, and R is a resistor. 1

Claims (1)

[Claims] When a number of movable shelves are connected and circulated, and the desired movable shelf number is set, the rotation direction closest to the predetermined stop position is automatically selected, and the set movable shelf is moved to the predetermined stop position. The movable shelf is circulated by setting the control mode to rotate up or down, and a stop signal is applied before the desired movable shelf reaches a predetermined stop position to move the desired movable shelf to the predetermined position. In a device that switches between two control modes for moving to a stop position as necessary, when switching from one mode to another, the mode switching signal is transmitted only when the motor is in a stopped state. and means for obtaining a pulse from a mode switching signal to automatically switch the modes after both of the two control modes are set to an initial state. Device.