JPS6063101A - Regulating mechanism of speed of feeding of wood of automatic plane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material feeding speed adjustment mechanism that controls the shipping speed according to the cutting load state of an automatic planer.

Conventional automatic planing machines are equipped with separate electric motors as power sources for driving the rotary plane blade and the material feeding member, respectively, and the operator can adjust the material feeding speed according to the width of the workpiece and the depth of cut. The material feeding speed was selected by operating the adjustment mechanism to control the speed of the electric motor for driving the material feeding member.

However, when cutting materials, the cutting load resistance applied to the rotary plane blade is proportional to the material width, cutting depth, and material feeding speed.
In other words, it increases in proportion to the amount of cutting per certain period of time, and when an operator cuts a material whose width and thickness are not constant, or when selecting a material to cut, the cutting load resistance increases. If it is too large, the rotational speed of the electric motor for driving the plane barrel will decrease, resulting in a poor cutting surface. There is a problem in that the electric motor becomes locked when cutting hard materials with a fishing force that has deteriorated in sharpness or when cutting under poor power supply conditions.

An object of the present invention is to eliminate the drawbacks of the prior art described above, and to automatically adjust the rotational speed of a material feeding member in order to adjust the material feeding speed according to the cutting load resistance applied to the rotational fishing force during material cutting. to prevent stress from being applied to the electric motor.
The goal is to prevent deterioration of the cut surface of the material. Another object of the present invention is to select the rotational speed of the material feeding member and adjust the material feeding speed in order to improve the cutting finish of the material.

In the present invention, even if the cutting load resistance applied to the rotating fishing force increases or decreases, if the cutting load resistance is kept below a certain level, deterioration of the cut surface of the material can be prevented, and the feeding speed of the material can be slowed down. do,
Considering that the cutting surface can be improved by cutting the particles, we have developed a speed adjustment circuit that can arbitrarily select the material feeding speed of the material feeding member, and a 'Ct motor for driving the material feeding member by detecting the material feeding speed. In order to control the power supply, a semiconductor element is connected in series to the power circuit, and a phase control circuit synchronized to the power supply frequency is installed, and the rotation speed of the rotating fishing force is measured to maintain a good cutting surface of the material. Then, in accordance with this rotational speed, the power of the drive machine for the material feeding section is controlled, and a speed detector, a comparison circuit, a speed setting circuit, etc. are connected in order to change the material feeding speed in a self-exciting manner. It was devised.

EMBODIMENT OF THE INVENTION An embodiment of the present invention will be described using the schematic diagrams of an automatic planer shown in FIGS. 1 and 2. FIG. 1 shows a front view of an automatic planer, in which a head 2 is disposed on a base 1, and these members are connected and fixed by a plurality of columns 3. The feed table 4 is attached to the column 3 so as to be slidable in the vertical direction, and is supported by the base l via the screw shaft 5. The vertical movement of the feed table 4 is achieved by lifting and lowering (not shown). Operate a nondle, a reversible motor, etc.
This is done by rotating the screw shaft 5. .

FIG. 2 shows a left side view and an elevation view of the head 2 shown in FIG. 1. A plane barrel 7 to which a plurality of fishing forces 6 are connected is rotatably supported by the head 2 and is incorporated in the head 2 so as to be rotationally driven by an electric motor 9. Furthermore, a feed roller 8 is rotatably supported at the front and rear of the planer barrel 7, and is built in to be rotated by an electric motor. The dimension between the upper surface of the material feeding table 4 which rotates and drives the fishing force 6 and the fishing force 6 is the material feeding interval.
This is the finished cutting dimension when the material is machined. When finishing the material to a predetermined thickness, set the feed interval so that the depth of cut is equal to the difference between the material thickness and the finished thickness, turn on switch The material is cut by the rotating fishing force 6 while being fed by the conveying roller 8.

When cutting a material, the cutting load resistance applied to the fishing force 6 increases in proportion to the width of the material, the depth of cutting, and the feeding speed. When the cutting load resistance becomes excessive, the planer body 7 to which the fishing force 6 is connected
As the rotational speed wave decreases, the finish of the cutting surface of the material deteriorates, and the electric motor 9, which drives the planer barrel 7 and material feed roller 8, locks, causing the material to be cut. If the cutting load resistance increases or decreases during feather cutting,
The rotational speed of the speech roller 8 is adjusted according to the fluctuation,
By changing the material feeding speed, the cutting load resistance can be kept almost constant, the finish of the cutting surface can be made uniform, and the edges of the electric motor 9 can be prevented from locking, making cutting work easier. It will be possible to do it smoothly.

Furthermore, if the rotational speed of the material feeding roller 8 can be arbitrarily selected, it becomes possible to carry out the cutting operation by dividing the finish of the cut surface of the material into rough, medium, and finishing conditions. However, if the material feeding speed is incorrectly selected, or if cutting is performed with a board width or depth of cut that would result in excessive cutting load resistance at the selected material feeding speed, the finish of the cut surface may deteriorate. If the speed deteriorates, the electric motor may lock up, so even if cutting is performed at the selected feeding speed, the cutting load resistance applied to the fishing force 6 is detected and the rotational speed of the material feeding roller 8 is adjusted. Need to adjust. That is, there is no need to automatically adjust the material feeding speed according to increases and decreases in cutting load resistance based on the material feeding speed selected by the operator. A circuit that realizes this problem is a block circuit diagram shown in FIG. 3.

FIG. 3 will be explained below.

A switch ■ is connected in series to the single-phase power lines Ill and IJ2, and an electric motor 9 that rotationally drives the fishing force 6 is directly connected to the load side of the switch ■. I and a triac as a semiconductor element for power switching are connected in series. Triac, L2
The trigger operation is performed by outputting trigger pulses from the bottom of the phase control circuit which receives a power synchronization signal from the power synchronization circuit B which detects the period of the power supply voltage applied to both ends of the triac n.

When cutting heavy metals, the magnitude of the cutting load resistance applied to the fishing force 6 is:
This can be determined by detecting an increase or decrease in the rotational speed of the planer barrel 7 to which the fishing force 6 is connected. Therefore, the output shaft of electric @9,
Alternatively, it can be determined by detecting the rotational speed of gears, sprockets, chains, belts, etc. of the power transmission mechanism that transmits the rotation of the electric motor (2) to the planer body 7, the rotational passage of the fishing force 6, etc. The speed detector door used here can be a magnetic type, an optical type, or a power generation type detector depending on the shape and material of the member to be detected.

FIG. 3 shows an example of measuring the rotational speed of the output shaft of the electric motor I. In FIG. The output signal of the speed detector is obtained as a DC pulse signal or an AC signal corresponding to the rotational speed of the electric motor I, and is converted into an appropriate electric signal by a switching circuit. This conversion circuit 5 is configured such that the input signal is a DC signal (if it is a Lus signal, it is a "K conversion circuit", if it is an AC signal, it is a rectification smoothing circuit, etc.). It is added to the fishing force 6. Cutting load resistance As the voltage increases, the rotation speed of the electric motor 9 decreases, and the output voltage of the conversion circuit 16 also decreases. Therefore, by measuring the output voltage, the cutting load resistance can be determined. If the output voltage of the conversion circuit t corresponding to a motor speed of 90 revolutions is set to ■ when the increase in resistance is regulated below a predetermined standard -, N ) ■!, then the cutting load resistance is within the standard. If Aυ, W<V2, it can be determined that the cutting load resistance is excessive.The comparator circuit 17 serves as this judgment circuit.When the logic [ll, Vl(Vll
(When D, outputs logic "0".

On the other hand, the mechanism for arbitrarily selecting the rotational speed of the material feeding roller 8 uses the same method as the mechanism for detecting the rotational speed of the electric motor 9, and detects the rotational speed of the electric motor (2) using a speed detector. Then, by constructing a conversion circuit, it is converted into a voltage signal. The output voltage 1 of this conversion circuit υ and the reference voltage 1 arbitrarily adjusted by a variable resistor are compared by a comparator circuit 21, and when the voltage is V4, the power of the motor 10 is reduced. to reduce the rotational speed of the material feeding roller 8, and va(
'W The electric power of the electric motors is increased to control the paulownia feeding speed so as to increase the rotational speed of the material feeding roller B.

The reference voltage 1 is a voltage corresponding to the material feeding speed desired by the operator, and can be set by adjusting the variable resistor 20 arbitrarily. There is.

The output signal of the comparator circuit 21 is logic "l" when Va)m.
, ■When 1, the output is logical rOJ.

Comparison circuits 17 and 21 are connected over the phase control circuit via an AND gate. Therefore, when cutting work is performed with the cutting load resistance applied to the fishing force 6 within a predetermined reference range, that is, in the state of vi>■, the output signal of the comparator circuit H is logic rlJ], and the variable resistor Accordingly, the phase control circuit member is operated according to the output signal of the comparator circuit 21, and the conduction angle of the triac ν is controlled so that the rotation speed wave of the electric motor is adjusted to the set speed. adjust.

During cutting at the material feeding speed set by the variable resistance addition, if the cutting load resistance increases and Vl<V2, the output of the comparator circuit 17 becomes logic "0", so the antgame 1
22, the output signal of the comparison circuit 21 is blocked, the input signal of the phase control circuit H is set to logic [0], the conduction angle of the triac is reduced, the rotational speed of the electric motor IO is slowed down, and the cutting load resistance is reduced. As explained above, according to the present invention, which adjusts the feeding speed so that the cutting load resistance does not become excessive, the fishing force 6 and the rotational speed of the rotational drive transmission system of the material feeding roller 8 can be adjusted. The circuit configuration was designed to detect and grasp the cutting load resistance and material feeding speed. It is also possible to detect the cutting load resistance and material feeding speed from the load current by detecting the load current.In this case, the output signal from the current detector is rectified and smoothed, and then input to the comparison circuit 17.21. By connecting, the same control as described above becomes possible.

According to the present invention, an electric motor for driving the rotary button blade and an electric motor for rotating the material feeding roller are provided, and the mechanism is such that the operator can arbitrarily select the material feeding speed when cutting the material, and the material is fed at the selected material feeding speed. During cutting, if the cutting load resistance becomes excessive, the rotation speed of the material feeding roller drive motor is controlled to reduce the material feeding speed, thereby reducing the cutting load resistance. Even when cutting a material with non-uniform width and plate thickness, the finished surface of the material can be uniformly finished and improved without deteriorating the finished surface of the material.

In addition, the cutting load resistance is detected and the material feeding speed can be automatically adjusted according to the increase or decrease in cutting resistance, so even if the operator selects the material feeding speed by mistake, the electric motor will not lock up. It is no longer possible to cut the feed material.

Therefore, it is possible to improve the cutting work efficiency, reduce the labor of the operator, and improve the uniformity of the cut surface, which greatly improves the content of the material cutting work by automatic plane notation. did it

[Brief explanation of drawings]

FIG. 1 is a front and side view showing an embodiment of the automatic plane machine of the present invention;
2 is a partial left side view and an elevational view of FIG. 1, and FIG. 3 is a block circuit diagram. In the figure, l is the base, 2 is the head, 3 is the column, and 4
is the shipping table, 5 is the screw shaft, 6 is the fishing force, 7 is the plane body, 8
1 is a feed roller, 9 is a motor, 11 is a switch, ν is a triac, 13 is a power synchronization circuit, shell is a phase control circuit, 15, 1B is a speed detector, 16.19 is a conversion circuit, 1
7.21 is a comparison circuit, 20 is a variable resistor, and 22 is an AND gate. Name of patent applicant Hitachi Koki Co., Ltd. Haramachi Factory Figure 1-3

Claims (1)

[Claims] A material feeding path is formed with a material feeding table or material feeding section I facing the rotary planer blade, and either one can be raised or lowered according to the thickness of the material or processing dimensions, and the material feeding interval can be adjusted. , an automatic plane machine that feeds material with a material feeding member and processes it with a rotary planer blade, which has two electric motors that rotationally drive the rotary planer blade and the material feeding member, respectively, and when cutting the material, a detector for detecting the state of cutting load applied to the rotary planer blade; a first conversion circuit that receives the output of the detector and converts it into an appropriate electrical signal; A first comparison circuit that compares the total magnitude with a reference signal installed according to the limit value of There is also a phase control circuit that controls the conduction angle of the semiconductor purple in synchronization with the frequency of the power supply, a detector that detects the material feeding speed of the material feeding member, and a circuit that receives the output of the detector and converts it into an appropriate electrical signal. A second conversion circuit that performs conversion, a speed setting circuit that can arbitrarily set the material feeding speed, and a second comparison circuit that compares the output signals from the speed setting circuit and the second conversion circuit, and The output signal of the first comparison circuit is connected to the phase control circuit via a discrimination circuit that controls the output signal of the second comparison circuit, and the rotation speed of the electric motor for driving the material feeding member is controlled. Features a material feeding speed adjustment mechanism.