JPS6226762B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a movable shelf, and in particular, a device for controlling a movable shelf from a remote point by receiving light emitted from a projector by a light-receiving element of the movable shelf disposed on a rail. This invention relates to a remote control device for a movable shelf that can be easily controlled.

Conventionally, a control device for a movable shelf that is movable on a rail by an electric motor has a mechanism in which a rod attached to a movable shelf is slid by a lever, as disclosed in Japanese Patent Publication No. 12346/1973. In addition, some rods are linked with switches for starting, stopping, etc., so that the lever can be operated directly.

However, when such a control device is used, the operator of the forklift tower, which is a cargo handling device, has to get down and operate it each time it is operated, which makes the operation inconvenient and the work inefficient. It was hot.

Similarly, in addition to the methods mentioned above that are operated by direct acquisition, there are also methods that use radio waves.
There are wireless control devices such as those using ultrasonic waves and those using infrared light, but those using radio waves have the disadvantage of being expensive, and others use an invisible body as a medium, so they cannot be controlled. In cases where a plurality of movable shelves are installed adjacent to each other, erroneous operations are likely to occur unless a separate signal is sent to each movable shelf, and this solution requires complicated equipment. The problem was that it also became expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a remote control device for a movable shelf that is highly efficient, has no fear of malfunction, and is inexpensive.

In order to achieve the above object, the present invention allows the light emitted from a light projector to be received by a light-receiving element on the side surface of the movable shelf to move and stop the movable shelf.
That is, in the present invention, a pair of control units for controlling movement in the left and right directions are disposed on the side surface of each movable shelf, and inside the movable shelf, a motor is started, stopped, or unlocked by a signal from each control unit. Each of the control units is provided with a pair of light-receiving elements spaced apart for starting or unlocking, and the output side of the light-receiving element is connected in parallel corresponding to the light-receiving element, and First and second switching circuits each having a delay circuit and a relay circuit are connected in series, and the relay circuit has first and second diodes connected in series in opposite polarity directions, and the first and second switching circuits each having a delay circuit. The present invention is characterized by comprising first and second electromagnetic relays connected in parallel to the two diodes, respectively, to selectively operate the start, stop, or lock release switch.

When the light emitted from the light emitter is received by the starting light receiving element in either the control unit for left or right direction movement control, it is transmitted to the first or second light receiving element via the first or second switching circuit and the relay circuit. Energize the electromagnetic relay and turn on the motor switch to move the movable shelf to the left or right. Also, when the light is received by the stop light receiving element, the electromagnetic relay in the control unit is demagnetized and the motor is switched on.
Turn OFF and stop the movable shelf. Even if unnecessary light is momentarily thrown into the system, malfunctions can be prevented due to the presence of the delay circuit.

Next, the present invention will be specifically explained based on the drawings.

FIG. 1 is a side view of a movable shelf device equipped with a remote control device of the present invention, in which 1 is a rail, 2a, 2b, 2c are movable shelves movably mounted on the rail 1, and 3 is installed on each movable shelf. The wheels 4a, 4b, and 4c are electric motors provided in the movable shelf, and drive the wheels 3 by operating a switch (not shown) in a drive circuit to move the movable shelf to the left or right. 5
Numerals a, 5a', 5b, 5b', 5c and 5c' are a pair of control units for controlling movement in the left or right direction, which are attached to the sides of each movable shelf, and 6 is a floodlight such as a portable electric lamp.

Each control unit 5a, 5a', 5b, 5b', 5
c and 5c' have the same functions on the left and right sides, and as shown in enlarged views in FIGS. 2 to 4, two light receiving elements CDS ₁ and
Display lamps L ₁ , L ₂ , etc. for CDS ₂ , direction of movement confirmation, lock confirmation, etc. are attached, and the movable shelves 2 a, 2 b . . . It is supported on the side part so that it can freely tilt forward.

For example, this movable shelf 2a,
2b... is installed in a warehouse or the like, and the warehouse lighting is quite _bright . This is because the difference in the amount of light received by the CDS ₂ becomes small, so in order to avoid incident light from sources other than the projector 6, the front surface is appropriately turned downward as shown by the chain line in FIG.

Next, the electric circuits of the control units 5a, 5a', . . . housed in the housing 7 will be explained with reference to FIG.

In the figure, 10 is a relay circuit, and this relay circuit 10 includes two diode elements D ₁ and D ₂ .
are connected in series with opposite polarity directions, and electromagnetic relays RL ₁ and RL ₂ are connected in parallel to these diode elements D ₁ and D ₂ , respectively. Among these electromagnetic relays RL ₁ and RL ₂ , the relay contact (not shown) in one electromagnetic relay RL ₁ is used as a start switch contact for right or left direction, and the relay contact in the other electromagnetic relay RL ₂ is used as a stop switch contact. Alternatively, it can be used as a switch contact for unlocking, etc.

And the relay circuit 10 formed as above
A power supply E 1 is connected between both ends 11 and 11' on the one hand via a switching element Q ₂ , and on the other hand a power supply E ₂ is connected via a switching element _{Q 4} .
It is connected to the. Note that the polarities of the power supplies E ₁ and E ₂ applied to the relay circuit 10 are opposite to each other as shown in the illustrated example.

Furthermore, one switching circuit is formed by the above-mentioned switching element Q ₂ and switching element Q ₁ , and the light receiving element CDS ₁ is connected to the front stage of this switching circuit.

Furthermore, the other switching circuit is similarly formed by switching element Q ₄ and switching element Q ₃ , and a light receiving element is installed at the front stage of this switching circuit.
CDS ₂ is connected. The parallel circuit consisting of capacitor C ₁ and resistor R ₁ and the parallel circuit consisting of capacitor C ₂ and resistor R ₃ in each switching circuit are delay circuits for preventing malfunction when unnecessary light is projected, respectively. The delay time is set to approximately one second, for example. Further, the variable resistor VR is a balance adjustment resistor.

A remote control device according to an embodiment of the present invention is constructed as described above and operates as follows.

For example, when trying to move the movable shelf 2b to the left in FIG. Visible light is projected onto the activation light receiving element for a predetermined period of time corresponding to the delay time. If this light _- receiving element corresponds to light _{-receiving element CDS 1 in the} electric circuit shown in FIG. is given. When this switching element Q ₁ turns on, switching element Q ₂ also turns on, and the electromagnetic relay
RL ₁ is energized by the power source E ₁ through the diode element D ₂ , and a leftward start switch (not shown) provided in the motor drive circuit of the movable shelf 2b closes, causing the movable shelf 2b to move to the left. start. Note that the other movable shelves 2a, etc. located on the left side of the movable shelf 2b are activated at the same time as the movable shelf 2b is driven to the left through a connecting signal line (not shown) etc. that connects the movable shelves with each other. A signal is transmitted, and these mobile shelves 2a,
2b are configured to be interlocked.

Next, after moving the movable shelf 2b and the like to the left by the required distance between them and the movable shelf 2c, if light is projected onto the stop light receiving element, for example CDS ₂ in FIG. 5, in this case, the switching element Q ₃ ,
_Q4 turns ON, electromagnetic relay _RL2 is energized, and movable shelves 2a and 2b stop. Note that even when the movable shelf is in the moving state, the moving speed is usually slow and the light from the light projector 6 is visible light, so it is easy to project the light toward the light receiving element for stopping. .

In addition, in the above explanation, the light receiving element CDS ₂ was used for stopping, but a separate stopping means is provided in addition to the light receiving element, such as automatically stopping the movable shelf after it has moved the required distance in a certain direction. If the operating mechanism (not shown) is automatically locked at this point, the light receiving element CDS ₂ may be used for unlocking. As mentioned above, when light is projected only on a predetermined light receiving element during an operation such as starting, stopping, or unlocking, the control unit operates normally and causes the movable shelf to perform a predetermined operation. However, if both light-receiving elements are accidentally irradiated with light at the same time, or if both light-receiving elements are irradiated with unnecessary light from a car's headlights, etc., the currents in the relay circuit 10 cancel each other out, so the two Both electromagnetic relays RL ₂ and RL ₁ do not operate, preventing malfunction. Further, even if unnecessary light is instantaneously projected onto one of the light receiving elements, malfunction can be similarly prevented due to the presence of the delay circuit.

As described in detail above, according to the present invention, a pair of control units for left and right direction movement control are arranged on the side surface of each movable shelf, and an electric motor is operated inside the movable shelf by signals from each control unit. A switch for starting or stopping is provided, and each of the control units is provided with a set of two light receiving elements for starting and stopping or unlocking at intervals, and a light receiving element corresponding to the light receiving element is provided on the output side of the light receiving element. Since the first and second switching circuits and relay circuits are connected in parallel and each has a delay circuit in series, it is easy for forklift tower crews and others to stop moving shelves during cargo handling operations. It can be easily operated from a remote point, improving work efficiency. Further, the relay circuit has first and second diodes connected in series with opposite polarity, and is connected in parallel to the first and second diodes, respectively, to select the start, stop, or lock release switch. Since it has first and second electromagnetic relays that are activated automatically, when light is projected onto any of the light-receiving elements using a light projector, the corresponding electromagnetic relay is selectively energized and the motor starting circuit is activated. The movement of the movable shelf can be reliably stopped by turning the switch inside ON and OFF. Furthermore, due to the presence of a delay circuit within the control unit, it operates only when light is correctly received, and does not malfunction even if unnecessary light is momentarily received.

Furthermore, since the control unit is composed of two light-receiving elements, a switching circuit, an electromagnetic relay, and a portable floodlight, it has excellent practical effects in that it can be provided at an extremely low cost compared to other devices. It is something that will be done.

[Brief explanation of the drawing]

Fig. 1 is a side view of a movable shelf to which a remote control device according to an embodiment of the present invention is applied, Fig. 2 is an enlarged front view of the remote control device in Fig. 1, and Fig. 3 is a plan view of Fig. 2. 4 is a side view of FIG. 2, and FIG. 5 is an electric circuit diagram of a remote control device that is also an embodiment of the present invention. 1: Rail, 2a to 2c: Moving shelf, 3: Wheels,
4a to 4c: electric motor, 5a, 5a', 5b, 5b',
5c, 5c': Control unit, 6: Portable visible light projector, 7: Housing, 10: Relay circuit, CDS ₁ ,
CDS ₂ : Photodetector, C ₁ , C ₂ : Capacitor, D ₁ ,
D ₂ : Diode element, E ₁ , E ₂ : Power supply, Q ₁ to _{Q 4} :
Switching element, _R1 to _R4 : Resistance, _RL1 , _RL2 :
Electromagnetic relay, VR: variable resistance.

Claims (1)

[Claims] 1. In a drive control device for a movable shelf in which a plurality of movable shelves are placed on a rail and arranged so that the electric motor in each movable shelf can be driven to move the movable shelf in the left and right direction; In addition to arranging a pair of control units for directional movement control, a switch is provided inside the movable shelf to start or stop the electric motor according to a signal from each control unit; Alternatively, a set of two light-receiving elements for unlocking is provided, and first and second switching circuits are connected in parallel to the light-receiving elements on the output side of the light-receiving element and each has a delay circuit. and a relay circuit are connected in series; and the relay circuit is connected in parallel with first and second diodes connected in series with opposite polarity directions, and the first and second diodes are connected in parallel with each other for the activation. Alternatively, a remote control device for a movable shelf comprising first and second electromagnetic relays for selectively operating a stop or unlock switch.