JPH0627325Y2 - Operating device for heavy and light loads such as woodworking machines - Google Patents

Description

[Detailed Description of Device] a. Purpose of the Invention (Industrial Application Field) The present invention is an operating device for heavy and light loads such as woodworking machines used in the wood processing industry. More specifically, the present invention relates to an operating device in which a motor is driven by a commercial power source during a heavy load, and an inverter having a capacity corresponding to the drive is used during a light load, so that free shifting is possible.

(Prior Art) Conventionally, in the woodworking industry, a polishing machine that both grinds the base material before painting and polishes the coating film after painting requires a power of 7.5 kw, for example, when grinding the base material It requires less than half the power, but the polishing rate must be adjusted depending on the type of paint. Therefore, as shown in FIG. 6, the polishing band 14 corresponding to the material feeding means 13 mounted on the machine body 12 is suspended on the driving and driven drums 15 and 16 and 17 and the driving drum 15 which functions as the polishing drum. The heavy load motor 18 is linked by a chain or belt 19, and the variable load motor 20 for light load is linked by a chain or belt 21 so that the two motors 18, 20 described above are linked. Polishing band 1 by selective operation of
Both heavy load operation of 4 and variable speed operation of light load are performed.

(Problems to be Solved by the Invention) In the conventional driving apparatus described above, as shown in FIG. 6, a heavy load motor 18 and a light load variable speed motor 20 are mounted on motor bases 22 and 23. Install and juxtapose these motors 1
Chain 8 or 20 and drive drum 15 of polishing band 14
Since they are linked by 9,21, many equipments and parts are used, assembly and adjustment are troublesome, and the variable speed motor 20 is expensive even if it is small. There is a problem in that the machine cannot be provided on the market, and this operating device requires a large installation space, so that the size of the machine becomes large.

The present invention has been made to solve the above-mentioned conventional problems, and a heavy load motor and a light load operation can be switched by a commercial power source and an inverter having a light load capacity. It is an object of the present invention to provide an operating device capable of variable speed operation of a load.

B. Configuration of the Invention (Means for Solving the Problems) In order to achieve the above object, a heavy-duty load operating device such as a woodworking machine of the present invention changes the load lightly and lightly, and shifts when the load is light. The required driven body is linked to a motor corresponding to a heavy load, and is equipped with a switching means for switching the motor to a commercial power source operation at a heavy load and to a light load capacity inverter operation at a light load. .

(Operation) In the operation device configured as described above, when the heavy load motor 8 is connected to the commercial power source CP by the switching means 11, the motor 8 rotates at a constant speed at the rated output and is driven by a heavy load. The body 6 is reliably driven at a constant speed to perform heavy load work.

However, if the heavy load motor 8 is connected to the light / negative inverter INV by the switching means 11, the motor 8 can freely change the rotation speed by the voltage and frequency conversion by the inverter INV, and the lightly loaded driven object can be converted. 6 is rotated at a speed adapted to the processing conditions, etc. to perform versatile light load work. In this case, since the load applied to the inverter INV is within its rated value, safe and reliable operation is compensated. It

Furthermore, since the above-mentioned inverter INV performs the same function as starting the motor 8 and performing a soft start by connecting it to the star delta connection, it is possible to omit the circuit for starting the motor 8 by connection conversion. It is a thing.

(Embodiment) Next, an embodiment of the device according to the present invention will be described with reference to the drawings.

In FIG. 1 of the drawings, A is a grinder for woodworking showing an example of a machine to which the present invention is applied. A belt type feeding member 2 is suspended above the machine body 1 and an intermediate portion of the feeding member 2 is provided. Above the section, there are arranged three drums, namely, a drive drum 3 on the front side supported by the machine body 1, a driven drum 4 positioned on the rear side thereof, and a driven drum 5 positioned intermediately above them. , 4, 5 are endlessly suspended by a polishing band 6, and when the drive drum 3 is driven by a motor described later, the polishing band 6 is rotated to polish the material. In this case, the drive drum 3 is lowered by an eccentric bearing device (which is of a known type and therefore the drawing and description thereof are omitted) as shown in FIG. 2, whereby the polishing band 6 is pressed against the material, Applying so-called heavy load grinding, which requires a large load, after coating For raises the driving drum 3 is lowered to pad 7 in place of this, the thereby contacting the polishing zone 6 to resiliently materials, and performs polishing of a small load so-called light load.

Reference numeral 8 denotes a heavy load motor, which uses a known induction transmission and is provided by being attached to a motor base 9 in the machine body 1 and linked with the drive drum 3 by a chain or a belt 10 as shown in FIG. As shown in the circuit diagram, magnet switch M
When S1 is closed, the commercial power source CP operates, and when the magnet switch MS2 is closed, the inverter INV operates.

Reference numeral 11 is a switching means for switching between the commercial power supply CP and the inverter INV described above. The switching means 11 switches the motor 8 to the commercial power supply operation when the load is heavy and to the inverter operation when the load is light. , A commercial power source C as shown in FIG.
Circuits a, b, and 4 of 4 are composed of an S pole provided with a P thermal relay OL1 and an R pole provided with a pushbutton switch PB1.
c circuit, d circuit, a commercial power source CP, an inverter INV selection switch SS1 and a switching time setting timer TR1 in the a circuit, and the above-mentioned timer T in the b circuit.
A contact tr1 of R1, a contact ms1 of a magnet switch MS1 for a commercial power source, a magnet switch MS2 for an inverter INV, and a contact ms2 of a magnet switch MS2 connected in parallel therewith, and a relay CR1.
, And the contact tr1 of the timer TR1 described above in the c circuit.
And a timer TR2 for switching timing between the commercial power supply CP and the inverter INV. The d circuit is provided with the contact tr2 of the timer TR2 described above, the magnet switch MS1 for the commercial power supply CP and its contact ms1. .

In the operating device shown in the above embodiment, when the selection switch SS1 is turned on and placed and the push button switch PB1 is turned on, the magnet switch MS2 is turned on, the secondary side of the inverter INV is connected, and the relay CR1 is turned on. Therefore, the inverter INV operates to start the motor 8, and a few seconds after the start, the timer TR1 turns on,
The magnet switch MS2 and the relay CR1 are turned off, and after a few seconds, the timer TR2 is turned on and the magnet switch MS1 is turned on. Therefore, the motor 8 is operated by the commercial power supply CP, and the driven object is driven by the output corresponding to the rated heavy load. The polishing band 6 is driven at a constant speed, and the base is ground by the polishing band 6.

Further, when the selection switch SS1 is turned off and the push button switch PB1 is turned on, the magnet switch MS1 is turned on, the secondary side of the inverter INV is connected, the relay CR1 is turned on, and the inverter INV is started. Changes the rotation speed arbitrarily by the conversion of electric power and frequency based on the adjustment of the variable resistor VR1 in the inverter INV, and drives the polishing zone 6 as the driven body, whereby the speed corresponding to the type of paint is changed. The coating film is polished.

In addition, as shown in the section of the action, this operating device can also perform the function of softly starting the motor 8, and also in the woodworking machine other than the polishing machine shown in the above embodiment, and other machines,
Of course, it can be widely used for those requiring both heavy load constant speed operation and light load variable speed operation.

C. Effects of the Invention As described above, the device of the present invention is capable of performing constant-speed operation of a heavy-load driven object and driving a light-load driven object depending on whether commercial power is directly supplied to the heavy-load motor or is supplied via an inverter. The variable speed operation of the body can be achieved by a single motor, and the operation can be achieved by a simple means for a heavy load and a light load driven object without using an inverter having a heavy load capacity, and the cost can be reduced. Can respond. for that reason,
Unlike conventional driving devices that use two motors, the number of equipment and parts used is small, assembly and adjustment are not troublesome, and because only a general-purpose motor is used, the motor cost is low, so the driving device is inexpensive. Can be supplied, and 1
Since a motor having only a stand requires a small installation space, it has a unique effect such as downsizing of a machine.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a woodworking polishing machine in which an apparatus according to the present invention is implemented. FIG. 2 is a side view of the polishing band showing the state of base grinding according to the above. FIG. 3 is a side view of the polishing band showing the above-mentioned polishing state of the coating film. FIG. 4 is a circuit diagram for switching and operating the motor in the same as the commercial power source and the inverter. FIG. 5 is a circuit diagram of switching means for switching and connecting a commercial power source and an inverter to the motor in the same as above. FIG. 6 is a side view showing an operating device of a conventional woodworking polishing machine. In the figure, 6 is a driven body, 8 is a heavy load motor, CP is a commercial power source, INV is a light load inverter, and 11 is a switching means.

Claims (1)

[Scope of utility model registration request] 1. A motor corresponding to a heavy load is linked to a driven body which changes its load lightly and lightly and requires a gear shift when the load is light.
A heavy / light load operating device for woodworking machines or the like, characterized by being equipped with a switching means for switching the motor to a commercial power source operation at a heavy load and to a light load capacity inverter operation at a light load.