JPH0327761Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feeding interval adjustment device for a woodworking machine, and more particularly to a feeding material interval adjusting device suitable for improving operability.

Conventionally, in woodworking machines, the rotation of a reversible electric motor is controlled by operating an operation switch such as a foot switch, and the material feeding interval on the material feeding path is adjusted according to the thickness and finished dimensions of the material to be processed. be. Therefore, when the elevating and lowering speed of the elevating member is high and the material feeding interval is finely adjusted with an accuracy of 1/10 mm, it is difficult to match the material feeding interval to the target material feeding interval. In order to improve this problem, a foot switch that operates in two stages depending on the amount of depression is used to control the phase of the triax connected in series to the power line of the reversible motor, thereby switching the rotational speed of the reversible motor between low speed and high speed. It is being done. but,
In this case, the foot switch has many components, resulting in a complicated foot switch. Furthermore, since it is necessary to adjust the amount of depression of the foot switch, the operation becomes troublesome for the operator, and improvements have been desired.

The present invention was developed in view of the above, and its purpose is to allow the elevating member to be raised and lowered at low speed for a preset time T after operating the operation switch, and to allow the material to be fed at intervals during that time. To provide a material feeding interval adjusting device for a woodworking machine which can perform fine adjustment of the material feeding interval and eliminates the troublesome work of finely adjusting the material feeding interval by adjusting the amount of depression of an operation switch.

The features of the present invention include an operating switch that instructs the direction of elevation of the elevating member, a timer that receives an output signal from the operating switch and generates a single pulse with a pulse width of a preset time T, and a timer that generates a single pulse with a pulse width of a preset time T. A power circuit that controls the power supplied to the reversible motor for lifting and lowering, the output signal from the operation switch and the output of the timer are input, and the time t during which the operation switch is operated, and the time preset by the timer. The power circuit is controlled by a switching circuit that rotates at a low speed when t<T and switches from low speed to high speed after time T when T<t.

The present invention will be explained in detail below using the embodiments shown in FIGS. 1 to 4.

FIG. 1 is a front view showing an embodiment of a woodworking machine equipped with a feeding interval adjusting device according to the present invention, and an automatic planer is illustrated as the woodworking machine. In FIG. 1, reference numeral 1 denotes a base, on which a plurality of columns 2 are vertically supported and fixed, and on the upper part of the columns 2 a head 3 is arranged and fixed. The head 3 incorporates a rotatably supported planer body to which a planer blade for wood processing is fastened, an electric motor for rotationally driving the planer barrel, and a material feed roller (not shown). and,
A material feeding table (elevating member) 4 is provided to face the head 3, and the material feeding table 4 is fitted with a hole in the column 2 so as to be slidable in the vertical direction in the figure. The material feeding table 4 is moved up and down by transmitting the rotation to the screw shaft 6 via a gear and rotating the screw shaft 6. Reference numeral 7 denotes an operation switch, which by operating it controls the rotation of the reversible motor 5, and controls the rotation of the head 3.
By raising and lowering the material feeding table 4, the material feeding interval between the circumferential surface of the plane blade and the material feeding table 4 can be appropriately set.

2 to 4 are circuit block diagrams showing one embodiment of the material feeding interval adjusting device of the present invention.
Each figure is a circuit diagram showing a different embodiment of a power circuit that controls the power supplied to the reversible motor 5 of FIG. 1, and FIG.
FIG. 4 is a block diagram of a circuit that receives signals from (up switch 7a, down switch 7b) and controls the power circuits shown in FIGS. 2 and 3. FIG.

In FIG. 2, reference numeral 8a denotes a triax connected in series to the power line of the reversible motor 5, and a series circuit of a capacitor 9a, a resistor 10a and a relay contact 11a is connected in parallel to the triax 8a. The trigger phase angle of the triax 8a is determined by the capacitor 9a and the resistor 10a, and when the relay contact 11a is closed, the electric charge charged in the capacitor 9a via the resistor 10a is discharged via the bidirectional trigger element 12a, and the trigger phase angle is determined by the capacitor 9a and the resistor 10a. Turn on. Therefore, capacitor 9a, resistor 1
By appropriately setting the value of 0a, it is possible to regulate the power supplied to the reversible motor 5 by the triax 8a, thereby reducing the rotational speed of the reversible motor 5 and slowing down the rising speed of the material feeding table 4. be able to. Further, a relay contact 13a is connected in parallel to the triax 8a, and when the relay contact 13a is closed, the full voltage is applied to the reversible motor 5, and the reversible motor 5 reaches its normal rotational speed.
The rising speed of the material feeding table 4 can be increased. The circuit consisting of the triax 8a, the capacitor 9a, the resistor 10a, the relay contact 11a, the trigger element 12a, and the relay contact 13a described above rotates the reversible motor 5 forward at low or high speed, and raises the material feeding table 4 at low or high speed. This is a circuit for narrowing the material feeding interval. On the contrary,
Triack 8b, capacitor 9b, resistor 10
b, a circuit consisting of a relay contact 11b, a trigger element 12b, and a relay contact 13b is a circuit for reversing the reversible motor 5 at low or high speed and lowering the material feeding table 4 at low or high speed to widen the material feeding interval. Since the operation is the same as above, the explanation will be omitted. Therefore, relay contact 1
By controlling the opening and closing of 1a, 13a and 11b, 13b, the rotational direction and rotational speed of the reversible electric motor 5 can be controlled, and the lifting direction and lifting speed of the material feeding table 4 can be controlled.

FIG. 3 shows another embodiment, in which the same parts as in FIG. 2 are designated by the same reference numerals. In FIG. 3, relay contacts 13a and 13b in FIG. 2 are connected in series with resistors 14a and 14b, respectively, to form a charging circuit for capacitors 9a and 9b, respectively. Here, the resistance values of the resistors 14a and 14b are set smaller than the resistance values of the resistors 10a and 10b, respectively, and when the relay contact 11a is closed, the operation is the same as in the case of FIG. 2, and the reversible motor 5 is operated at low speed. When the relay contact 13a is closed, a voltage close to the full voltage is applied to the reversible motor 5, causing the reversible motor 5 to rotate forward at high speed, and similarly, the relay contact 11b is closed. In this case, the reversible motor 5 rotates in the reverse direction at a low speed, and when the relay contact 13b is closed, the reversible motor 5 rotates in the reverse direction at a high speed. Therefore, in Fig. 3, the second
As shown in the figure, relay contacts 11a, 13a and 11
By controlling the opening and closing of b and 13b, the lifting direction and lifting speed of the material feeding table 4 can be controlled.

Next, the opening/closing control of the relay contacts 11a, 13a, 11b, and 13b shown in FIGS. 2 and 3 will be explained with reference to FIG. In FIG. 4, reference numerals 7a and 7b are operating switches for raising and lowering, respectively. Here, a case will be considered in which the operating switch 7a for raising is operated (turned on). When the lift operation switch 7a is turned on, its output signal changes from logic "L" to "H".
Assuming that
generates a single logic "H" pulse with a pulse width of . The output signals of the timer 15 and the operation switch 7a are input to an AND gate 16, and when the above two inputs are both logic "H", the output signal from the AND gate 16 becomes logic "H".
During the time T during which the output is at logic "H",
The relay coil 18 is energized and
The relay contact 11a shown in the figure becomes a closed circuit. This causes the capacitor 9a to connect to the relay contact 11a and the resistor 1.
When the capacitor 9a is charged through the capacitor 0a and reaches the on-voltage of the trigger element 12a, the charge in the capacitor 9a is discharged to turn on the triac 8a. The conduction angle of the triax 8a is the capacitor 9a, the resistor 10a,
Determined by the trigger element 12a, the reversible motor 5
The rotational speed of the reversible motor 5 is reduced by regulating the power supplied to the reversible motor 5 by phase control. Then, when the time T regulated by the timer 15 has elapsed,
The output signal from the AND gate 16 becomes logic "L", the relay coil 18 is de-energized, and the relay contact 11a is opened. At this point, the output of the AND gate 17, which inputs the inverted signal of the output signal from the raising operation switch 7a and the AND gate 16, becomes logic "H", the relay coil 19 is excited, and the relay contact 13a is closed. . When the relay contact 13a is closed, the full voltage is applied to the reversible motor 5 in FIG. 2, and the voltage close to the full voltage is applied to the reversible motor 5 in FIG. 3.

When the lower operation switch 7b is operated in the same manner, the relay coils 23 and 24 are excited via the timer 20 and the AND gates 21 and 22, and the relay contact 11b is closed, and then when the relay contact 11b is opened. Relay contact 13b becomes closed.

As mentioned above, the operation switch 7a or 7
When b is operated, the power to the reversible motor 5 is regulated during the time T pre-regulated by the timers 15 and 20, the rotational speed of the reversible motor 5 is reduced, and the material feeding table 4 is raised and lowered at a low speed. After time T, the rotational speed of the reversible electric motor 5 is increased to move the material feeding table 4 up and down at high speed.

Note that AND gates 16, 17, 21,
One input of 22 is the raising operation switch 7a,
Since it is an output signal of the lowering operation switch 7b, the relay coils 18, 19, 23, and 24 can be demagnetized at any time by turning off the operation switches 7a and 7b, and the rotation of the reversible motor 5 is stopped and the transmission is stopped. It is also possible to stop the lifting and lowering of the material table 4.

Therefore, when adjusting the material feeding interval on the material feeding path to the target material feeding interval, after operating the operation switch 7a or 7b, the material feeding interval is adjusted for the time T regulated by the timer 15 or 20, that is, the material feeding interval is adjusted to the target material feeding interval. table 4
This can be done while the machine is moving up and down at low speed, and the feeding interval can be adjusted with high precision. Note that the time T regulated by the timers 15 and 20 is the time necessary to finely adjust the material feeding interval, but it is usually sufficient to set it to about several seconds.

As explained above, according to the present invention, the elevating member can be raised and lowered at a low speed during the preset time T after operating the raising operation switch or lowering operation switch, so that the material feeding interval can be reduced. It is easy to make fine adjustments to match the target material feeding interval, and the operator does not have to perform the cumbersome task of fine-tuning the material feeding interval by increasing or decreasing the amount of pressure on the operating switch, improving operability. effective.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a woodworking machine equipped with a feeding interval adjustment device according to the present invention; FIG.
Fig. 3 is a circuit diagram showing different embodiments of power circuits for controlling the power supplied to the reversible motor shown in Fig. 1, and Fig. 4 is a circuit diagram for controlling the opening/closing of the relay contacts shown in Figs. 2 and 3. FIG. 2 is a circuit block diagram showing an embodiment of the control circuit of FIG. 4... Material feeding table, 5... Reversible electric motor, 7,
7a, 7b...operation switch, 8a, 8b...triax, 9a, 9b...capacitor, 10
a, 10b...Resistance, 11a, 11b, 13a,
13b... Relay contact, 12a, 12b... Trigger element, 14a, 14b... Resistor, 15, 20...
...Timer, 16, 17, 21, 22...AND gate, 18, 19, 23, 24...Relay coil.

Claims (1)

[Claim for Utility Model Registration] A head equipped with a cutting tool for wood processing is fixed to the upper end of multiple columns erected on a base, and a reversible electric motor is installed below the head to use the column as a guide, and the column is operated as a guide by an operation switch. In a woodworking machine equipped with a table that is driven up and down according to instructions, and in which the material to be cut is passed through a path formed between the head and the table and then cut, the ON operation signal from the operation switch instructs the direction in which the table goes up and down. In response to this, a timer that emits a single pulse with a preset time width T and a power circuit that can increase or decrease the power supplied to the reversible motor and adjust the rotational speed of the reversible motor from low speed to high speed are provided. Upon receiving the operation signal from the operation switch and the timer output signal, if the time t during which the operation switch is operated is shorter than the time T set by the timer, the reversible motor is instructed to operate at a low speed for the time t. If the operation time t of the operation switch continues to be operated for longer than the time T set by the timer, after the time T, an instruction signal is sent to the reversible motor from low speed operation to high speed operation. 1. A material feeding interval adjustment device for a woodworking machine, characterized in that a switching circuit that is switched by logic processing is provided, and the power circuit is controlled by an instruction signal from the switching circuit.