JPH04633Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a transmitter used for remote control.

B. Summary of the invention This invention is a remote control transmitter for a controlled object where safety is important, such as a moving object. By providing a switch, it is possible to make an emergency stop with a simple operation in the event of a runaway moving object.

C. Prior Art FIG. 2 shows a remote control transmitter for a patient to operate a medical hoist at hand, a receiver provided integrally with the hoist, and the main circuit of the hoist.

When the patient is moving the hoist H on which he or she is suspended, for example, in the right direction, the patient must turn the main switch SW.
The right drive switch is turned on.
Press S ₃ . The right direction running command of Switch S ₃ is
The transmission control circuit TC modulates the frequency or pulse width corresponding to this command and transmits it to the transistor.
Applied to the base of Tr. The transistor Tr is turned on and off by changing the output frequency or pulse width from the control circuit TC, and the light emitting diode RD emits infrared rays in response to this. This signal is the third
As shown in the figure, the light is received by the light receiving diode of the receiver R integrated with the hoist H, and is introduced into the reception control circuit RC via the amplifier AMP. The output side of the control circuit RC includes a hoisting command output transistor Tr ₁ , a hoisting command output transistor Tr ₂ ,
A right travel command output transistor Tr ₃ , a left travel command output transistor Tr ₄ and an emergency stop output section (not shown) are connected. Therefore, the control circuit RC discriminates and decodes the input signal, and
The right travel command is output to the base of the output transistor Tr ₃ and turned on. Therefore, relay Ry ₃ is energized, and by closing its contact Ry _3-1 , power is supplied to travel motor IM ₂ from AC power supply,
(Contact S was previously closed) Motor IM ₂
Rotate in the forward direction.

When stopping the travel motor _IM2 , this is done by releasing the pressed switch _S3 .

In addition, when moving to the left, set the left running switch _S4 , when moving up to reduce the load on the patient's legs, set the hoisting switch _S1 , and conversely, when moving down, set the hoisting switch S1. By pressing the lower switch S ₂ , the travel motor IM ₂ and the hoisting/lowering motor IM ₁ are activated in the same manner as described above via the corresponding control elements.
is controlled as desired.

D. Problems to be Solved by the Invention The transmitter T used for the above purposes is designed to prevent dark current flowing inside the transmitter T, prolong the life of the battery E, and switch S ₁ to S. To prevent the receiver R side from operating if ₄ is pressed unnecessarily, a main switch is connected in series with battery E.
SW is connected. Therefore, when the main switch SW is in an open state, if any of the contacts Ry _1-1 to _{Ry 4-1} on the hoist H side is welded due to contact life or the like, the hoist H will run out of control. In this case, even if the emergency stop switch _S5 of the transmitter T is pressed, control becomes impossible because the main switch SW is in an open state. Therefore, in such a case, first close the main switch SW, then press the emergency stop switch _S5 to open the contact S on the hoist H side. In some cases, the operation of the transmitter is complicated and poses a safety problem.

The present invention has been made with the aim of eliminating such drawbacks.

E. Means for solving the problem This invention provides a second emergency stop switch that works in conjunction with the emergency stop switch installed in the transmitter, and this second emergency stop switch is electrically connected to the main switch. They are connected in parallel.

With this configuration, when an emergency occurs, when the emergency stop switch is pressed, the second emergency stop switch is turned on in conjunction with this switch and short-circuits the main switch, so even if the main switch is open, An emergency stop command can be sent from the transmitter even if

F. Embodiment An embodiment of the present invention will be described below in detail with reference to FIG.

In Fig. 1, parts with the same reference numerals as in Fig. 2 are the same or equivalent parts, and parts different from Fig. 2 are the second emergency stop switch _S6 , which is turned on in conjunction with the emergency stop switch _S5 . This is because we have established the following.
When this second emergency stop switch _S6 is turned on, it is electrically connected in parallel with the main switch SW so as to short-circuit it.

With the above configuration, if an accident occurs on the receiver side and a moving object, such as a hoist, goes out of control while the main switch is open, pressing the emergency stop switch _S5 In conjunction with this, the second emergency stop switch _S6 is also turned on. When this switch _S6 is turned on, voltage is applied to the transmission control circuit TC from the battery E through the switch _S6 , so the transmission control circuit TC converts it into an emergency stop signal when the emergency stop switch _S5 is turned on. After that, it is output to the base of transistor Tr.
Therefore, the transistor Tr turns on in response to the repetition frequency or constant width pulse applied to its base, and each time it turns on, a current flows through the route E-6-RD-Tr-E and is received by the light emitting diode RD. By sending infrared rays to the machine and releasing the contact S of the hoist, an emergency stop is applied in case the hoist runs out of control.

G. Effects of the invention According to the invention, even if an abnormality occurs on the receiver side when the main switch of the transmitter is opened, it is only necessary to press the emergency stop switch, so a transmitter that is easy to operate and safe can be obtained. It is something that can be done. Furthermore, since the main switch is in an open state when not in use, no dark current flows and the power consumption of the transmitter is as low as in the conventional case.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a block diagram of a conventional transmitter/receiver when applied to a hoist, and FIG. 3 is a diagram showing how the transmitter/receiver shown in FIG. 2 is used. T...Transmitter, R...Receiver, Tc...Transmission control circuit, _S5 ...Emergency stop switch, _S6 ...Second
emergency stop switch, SW...main switch,
Tr...transistor, RD...light emitting diode.

Claims (1)

[Scope of utility model registration request] In a transmitter, a transmitting control circuit having at least a forward/reverse switch and an emergency stop switch is connected to a power source via a main switch, and commands from each of the switches are converted into transmission signals and transmitted to a remote receiver. , a second emergency stop switch interlocked with the emergency stop switch is provided;
A transmitting device characterized in that an emergency switch is connected in parallel with the main switch.