JPH0340569Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] This invention is based on the cutting load condition of the automatic plane machine.
This invention relates to a material feeding speed adjustment mechanism that controls material feeding speed.

[Background of the invention] In conventional automatic planing machines, a single electric motor drives the rotary planer barrel and the material feeding member, and a variable speed gear and a continuously variable speed pulley are provided between the material feeding member and the electric motor to control the material feeding. Some have a mechanism that allows you to select the speed, while others have a mechanism that allows you to select the material feeding speed by driving the rotary planer blade and material feeding member individually with electric motors and controlling the speed of the electric motor that drives the material feeding member. It was hot.

When an operator attempts to cut material, he or she may operate gears or continuously variable speed pulleys to adjust the rotational speed of the material feeding member depending on the width of the material and the depth of cut. In the case where the blade and material feeding member are driven individually, the rotational speed of the motor for the material feeding member is arbitrarily adjusted, so it is difficult to cut materials with inconsistent width or the maximum cutting width that can be cut. When cutting material with the maximum depth of cut, if the material feeding speed set by the operator is not appropriate, the cutting load resistance will become excessive, and as a result, the rotation speed of the electric motor for driving the rotary plane blade will decrease, causing the rotary plane to The width and depth of the knife marks formed on the surface of the wood cut with the blade were uneven, which sometimes led to deterioration of the cut surface.

Figure 5 shows the shape of the knife mark.
represents the width and H represents the depth. The width and depth of this knife mark are closely related to the circumferential diameter, circumferential speed, and material feeding speed of the rotary planer blade. Generally, a good finished surface means that the width W of the knife mark is 1 mm and the depth H is 1 mm.
It is about 0.005mm.

However, if the rotational speed of the rotary planer blade decreases due to an increase in cutting load without changing the material feeding speed, the width and depth of the knife mark gradually increase, with the width W being 2 mm and the depth H being 0.01 mm. If the thickness exceeds mm, fine knife marks appear in the form of streaks on the surface of the material, reducing the product value.

Therefore, in the past, the rotary planer blade and the material feeding member were driven separately by electric motors, but since the relationship between the circumferential speed of the rotary planer blade and the material feeding speed is not related, it is possible to improve the finished surface of the material. I couldn't keep it that way.

[Purpose of invention]

The present invention eliminates the above-mentioned conventional drawbacks and automatically reduces the feed rate of the material according to the increase in cutting load resistance applied to the rotary plane blade, preventing deterioration of the cut surface of the material and improving the finish. It is important to keep the surface in good condition.

[Summary of the idea]

The present invention proposes that even if the cutting load resistance applied to the rotary plane blade increases, if the rotational speed of the rotary plane blade is kept above a predetermined value and the load condition applied to the rotary plane blade is limited,
Focusing on the ability to prevent deterioration of the finished state of the cutting surface of the material, we have developed a system that controls the rotary plane blade to slow down the material feeding speed when the rotation speed of the rotary plane blade decreases during material cutting. A comparison circuit is provided that compares the set voltage value corresponding to the regulated rotational speed with the voltage value that measures the rotational speed of the rotary plane blade during cutting and converts it into an electrical signal proportional to this rotational speed.
It is designed to be connected to a semiconductor element and a phase control circuit that control the power of the electric motor for driving the material feeding member.

[Example of idea]

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a front view of the automatic plane machine, and FIG. 2 is a left side view and an elevation view of the head shown in FIG.

In the figure, a head 2 is placed on a base 1,
These members are connected and fixed by a plurality of columns 3. The material feeding table 4 is attached to the column 3 so as to be slidable in the vertical direction, and is supported on the base 1 via a screw shaft 5. The material feeding table 4 is moved in the vertical direction by rotating the screw shaft 5 by operating a lift handle (not shown) or a reversible electric motor.

A plane body 7 to which a plurality of plane blades 6 are connected to the head 2
is rotatably supported and incorporated so as to be rotationally driven by an electric motor 9.

A material feed roller 8 is rotatably supported at the front and rear of the plane barrel 7 and is incorporated so as to be rotationally driven by an electric motor 10. Therefore, the machine is equipped with two electric motors 9 and 10 that rotate a rotary plane blade constituted by a plane blade 6 and a plane body 7, and a material feeding roller 8 serving as a material feeding member.

The dimension between the upper surface of the material feeding table 4 and the plane blade 6 is the material feeding interval, and the dimension when the material is fed by the material feeding roller 8 and cut by the plane blade 6 is the finished cutting dimension.

When finishing the material to a predetermined thickness, set the feed interval so that the cutting depth is equal to the difference between the material thickness and the finished thickness, turn on the switch 11,
The electric motors 9 and 10 are operated to transfer the material to the material feeding roller 8.
The rotating planer blade 6 is used to perform cutting while being fed by the rotating planer blade 6.

Even if the cutting load resistance increases and the rotational speed of the rotary planer blade decreases during material cutting, the knife mark on the finished surface of the material will change in response to the change in rotational speed before it becomes noticeable as streaks. , automatically feed roller 8
If the material feeding speed is decreased and the rotational speed of the rotary planer blade is restored to a predetermined value or higher, the finished state of the cut surface will not deteriorate.

The predetermined value of the rotational speed of the rotary planer blade is such that the knife mark that occurs on the finished cutting surface does not feel like a streak, that is, the width and depth of the knife mark are 2 mm or less and 0.01 mm or less, respectively. This is determined in relation to the material feeding speed.

The above operation will be explained using the block circuit diagram shown in FIG.

A power switch 11 is connected in series to the single-phase power lines L ₁ and L ₂ , and a plane blade 6 is connected to the load side of the switch 11.
An electric motor 9 for rotationally driving the material feeding roller 8 is directly connected thereto, and an electric motor 10 for driving the material feeding roller 8 and a triac 12 as a semiconductor element for power switching of the electric motor 10 are connected in series. The triggering operation of the triac 12 is performed by outputting a trigger pulse from a phase control circuit 14 which receives a power synchronization signal from a power synchronization circuit 13 which detects the period of the power supply voltage applied to both ends of the triac 12.

When cutting a material, the magnitude of the cutting load resistance applied to the plane blade 6 can be ascertained by detecting an increase or decrease in the rotational speed of the plane body 7 to which the plane blade 6 is fastened.

Therefore, it is also possible to detect the rotational speed of the output shaft of the electric motor 9 or the gears, sprockets, chains, belts of the power transmission mechanism that transmits the rotation of the electric motor 9 to the plane body 7, the rotational passage of the plane blade 6, etc. I can understand it.

Here, the speed detector 15 used may 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 rotation speed of the output shaft of the electric motor 9. In FIG.

The output signal of the speed detector 15 is obtained as a DC pulse signal or an AC signal according to the rotational speed of the electric motor 9, and is converted into an appropriate voltage signal by a conversion circuit 16.

This conversion circuit 16 is comprised of an FV conversion circuit if the input signal is a DC pulse signal, and a rectification and smoothing circuit if the input signal is an AC signal.

As the cutting load resistance applied to the planer blade 6 increases, the rotation speed of the electric motor 9 decreases, and the output voltage of the conversion circuit 16 also decreases, so by measuring the output voltage, the cutting load resistance can be grasped. be able to.

Here, the voltage value V ₁ corresponding to the rotation speed of the electric motor 9 when stabilizing the cutting load resistance to a predetermined value is applied to the inverting input of the comparator circuit 17, and the rotation speed of the electric motor 9 during material cutting is set as the voltage value V1. The voltage value detected by the detector 15 and output from the conversion circuit 16 is V
In this case, if V<V ₁ , it can be determined that the cutting load resistance is larger than a predetermined value.

The comparison circuit 17 serves as this judgment circuit, and outputs a logic "1" when V>V ₁ and a logic "0" when V<V ₁ . This output is sent to the phase control circuit 14.
is connected to perform phase control of the triac 12.

Therefore, when V<V ₁ , the output of the comparison circuit 17 becomes logic "0", so the conduction angle of the triax 12 is reduced, the power supplied to the motor 10 is reduced, and the rotational speed of the motor 9 is reduced. to recover, V>
The material feeding speed is automatically controlled so that V ₁ is achieved.

As explained above, even if the cutting load resistance applied to the plane blade 6 increases, the cutting load resistance is measured, the rotational speed of the electric motor 10 is controlled, and the material feeding speed by the material feeding roller 8 is automatically adjusted. In order to achieve this, the circuit is configured to be able to grasp the cutting load resistance applied to the planer blade 6.The load current of the motor 9 is detected by a CT current detector, a voltage drop using a low resistance, or a Hall element, etc. It is also possible to understand the cutting load resistance from the load current.

In this case, by smoothing the output signal from the current detector with a smoothing circuit and connecting it to the non-inverting input of the comparison circuit 17, the same control as described above becomes possible.

Also, the reference voltage is used as the inverting input of the comparator circuit 17.
I tried to give V ₁ , but as shown in Figure 4,
It is also possible to use a variable resistor 18 to adjust the reference voltage.

In this case, the material feeding speed can be automatically changed by appropriately setting a predetermined value of the rotation speed of the rotary planer blade and comparing this set value voltage with the rotation speed of the rotary planer blade during cutting.

[Effect of idea]

According to the present invention, when cutting material, the rotation speed of the electric motor for driving the material feeding member is slowed down in relation to the rotation speed that has decreased due to the increase in cutting load resistance applied to the rotary planer blade, and the material feeding speed of the material feeding member is reduced. Since the rotation speed is automatically decreased, the rotation speed of the rotary plane blade can be maintained at a predetermined value or higher.

Therefore, even if the knife mark on the finished surface of the material changes, the width and depth of the knife mark can be changed by 2.
Since it is possible to keep the cut surface within the range of mm or less, 0.01 mm or less, that is, within the range of a good finished surface, a good cut surface can always be maintained.

Furthermore, since the operator does not need to set the material feeding speed, the operator's labor can be reduced and efficiency during cutting work can be improved.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The drawings are a partial left side view and an elevation view of FIG. 1, FIG. 3 is a block diagram, FIG. 4 is an applied circuit diagram, and FIG. 5 is a diagram showing the shape of the knife mark. In the figure, 6 is a plane blade, 7 is a plane body, 8 is a feed roller, 9 and 10 are electric motors, 12 is a triax,
13 is a power synchronization circuit, 14 is a phase control circuit, 15
1 is a speed detector, 16 is a conversion circuit, 17 is a comparison circuit, and 18 is a variable resistor.

Claims (1)

[Scope of utility model registration request] The material feeding path is formed by the material feeding table facing the rotary planer blade or the material feeding member, and either one is raised or lowered according to the thickness of the material and processing dimensions, so that the material feeding interval can be adjusted. An automatic plane machine that feeds material with a member and processes it with a rotary planer blade has two electric motors that rotate the rotary plane blade and the material feeding member, respectively, and rotates the rotary plane blade during material cutting. A detector that detects the number, a conversion circuit that receives the output and converts it into an appropriate electrical signal, and compares the output signal of the conversion circuit with a reference signal set according to a predetermined rotation speed. Further, a phase control circuit is provided which connects a semiconductor element for power switching in series to the power circuit of the electric motor for driving the material feeding member and controls the conduction angle of the semiconductor element in synchronization with the frequency of the power supply. An automatic plane machine characterized in that the output signal of the comparison circuit is connected to a phase control circuit to control the rotation speed of the electric motor for driving the material feeding member, so that the rotation speed of the rotary plane blade is set to a predetermined rotation speed or higher. Material feeding speed adjustment mechanism.