JPH0223364Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a material feeding speed adjustment mechanism for an automatic plane machine.

Conventional automatic plane machines are equipped with separate electric motors as power sources for driving the rotary plane blade and the material feeding member, respectively.
The operator can set the desired material feeding speed by operating the material feeding speed adjustment mechanism according to the plate width of the workpiece and the amount of cutting depth, and also reduces the amount of cutting applied to the rotary plane blade when cutting the material. If the load resistance increases and exceeds a certain amount and the rotation speed of the rotary plane blade reaches the preset lower limit of rotation speed, the material feeding speed is reduced to reduce the cutting load applied to the rotary plane blade. I was trying to reduce resistance.

By the way, such a material feeding speed adjustment mechanism controls the speed so that the material feeding speed remains constant even if the cutting load resistance fluctuates within the range where the rotational speed of the rotary planer blade does not reach the preset lower limit of rotational speed. are doing.

In general, if W is the width of a knife mark that appears on the finished surface of a material after cutting with a rotary plane blade, then the number of blades of the rotary plane blade is n, the rotational speed of its shaft is N, and the material feeding speed is v. In this case, it is obtained as W=v/nN. Therefore, the width W of the knife mark is inversely proportional to the rotational speed N of the rotary planer blade, and the material feeding speed v
increases in direct proportion to , and the condition of the finished surface of the material deteriorates. Therefore, unless the rotational speed N of the rotary plane blade is adjusted in accordance with the increase or decrease in the cutting load resistance, the feed speed cannot be adjusted to stabilize the width W of the knife mark, and the finished surface will not be uniform. There was a problem.

This invention was created in view of the above points,
It is an object of the present invention to provide a material feeding speed adjustment mechanism for an automatic plane machine that makes it possible to smoothly finish the finished surface of the material.

That is, the present invention includes a first electric motor that is connected in parallel to a power source and that drives a plane blade and a second electric motor that drives a material feeding roller that sends a material feeding member, and the cutting load resistance of the plane blade is In the material feeding speed adjustment mechanism of an automatic plane machine, the adjustment mechanism is provided with an adjustment mechanism that controls the speed of the second electric motor and adjusts the material feeding speed of the material feeding roller. first and second speed detectors that respectively detect the speed and the material feeding speed of the material feeding roller; each receives the output of the first and second speed detector; and converts the output into an electrical signal. a setting circuit that outputs a voltage value corresponding to the width of the knife mark on the material feeding member based on the output signals of the first and second conversion circuits; and an output of the setting circuit. A first step of comparing the signal with a reference signal preset according to a limit value of the width of the knife mark.
a second comparison circuit that compares the output signal of the first speed detector with a reference signal regulated in advance to prevent the first motor from locking; A power switching semiconductor element connected in series to the circuit, and a phase control circuit connected to the semiconductor element and controlling the conduction angle of the semiconductor element in synchronization with the frequency of the power supply, The output from the second comparator circuit is
input to the phase control circuit via an AND gate,
The present invention is characterized in that the speed of the second electric motor is controlled, whereby the material feeding speed adjustment mechanism includes first and second speed detectors, first and second conversion circuits. , a setting circuit, first and second comparison circuits, semiconductor elements for power switching, a phase control circuit, etc., and the speed of the second motor is controlled by the phase of the output from the second comparison circuit via an AND gate. It will be input to the circuit and controlled.

Hereinafter, the present invention will be explained based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1-4. The automatic plane machine has two heads on the base one.
A base 1 and a head 2 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 by the base 1 via a screw shaft 5. The material feeding table 4 is moved in the vertical direction by operating an elevating handle or a reversible electric motor (both not shown) and rotating the screw shaft 5 (see FIG. 1). A plane barrel 7 to which a plurality of plane blades 6 are fastened is rotatably supported by the head 2 and is incorporated so as to be rotationally driven by a first 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 a second electric motor 10. That is, two electric motors are used: a first electric motor 9 that rotationally drives a rotary planer blade constituted by a planer blade 6 and a planer body 7, and a second electric motor 10 that rotationally drives a material feeding roller 8 serving as a material feeding member. (See Figures 2 and 3).

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, and turn on the switch 11 to cut the first and second Electric motor 9,10
is operated, and while the material is fed by the feed roller 8, it is cut by the rotating planer blade 6. The cutting load resistance applied to the planer blade 6 during cutting of the material increases in proportion to the width of the material, the depth of cut, and the feeding speed. If the cutting load resistance becomes excessive, the rotational speed of the planer barrel 7 to which the planer blade 6 is fastened will decrease, resulting in an uneven finish on the cut surface of the material, or in some cases causing the planer barrel 7 and material feeding roller 8 to become uneven. The first and second electric motors 9 and 10 may lock up, making it impossible to feed and cut the material.

If the cutting load resistance increases or decreases during material cutting,
By adjusting the rotational speed of the material feeding roller 8 and changing the material feeding speed according to the fluctuation, the cutting load resistance can be kept almost constant, and the first and second electric motors 9,
10 can be prevented from locking, so cutting work can be carried out smoothly.

Therefore, the material feeding speed adjustment mechanism of the automatic planing machine includes first and second speed detectors 12 and 13 that detect the rotational speed of the planer blade 6 and the material feeding speed of the material feeding roller 8, respectively, and these first and second speed detectors. first and second conversion circuits 14 and 15 that respectively receive the outputs of the speed detectors 12 and 13 and convert these outputs into electrical signals, and the outputs of these first and second conversion circuits 14 and 15. A setting circuit 16 that sets an electric signal corresponding to the width of the knife mark on the material feeding member based on the signal, and the output signal of this setting circuit 16 is compared with a reference signal set in advance according to the limit value of the width of the knife mark. a second comparison circuit 18 that compares the output signal of the first speed detector 12 with a reference signal regulated in advance so that the first electric motor 9 does not lock;
A semiconductor element for power switching, such as a triac 19, connected in series to the power circuit of the second electric motor 10.
and a phase control circuit 20 that controls the conduction angle of the triax 19 in synchronization with the frequency of the power supply. The outputs from the first and second comparison circuits 17 and 18 are input to the phase control circuit 20 via the AND gate 21 to control the speed of the second electric motor 10. By doing this, the material feeding speed adjustment mechanism is controlled by the first and second speed detectors 12 and 1.
3, the speed of the second electric motor 10 is The automatic planer is controlled by inputting the output from the second comparison circuit 18 to the phase control circuit via the AND gate 21, thereby making it possible to finish the finished surface of the material smoothly. A material feeding speed adjustment mechanism can be obtained.

That is, a switch 11 is connected in series to the single-phase power lines L ₁ and L ₂ , a first electric motor 9 that rotationally drives the plane blade 6 is directly connected to the load side of the switch 11 , and a material feeding roller is connected in parallel with this. A second electric motor 10 for rotationally driving the motor 8 and a triax 19 were connected in series. The trigger operation of the triac 19 is performed by outputting a trigger pulse from a phase control circuit 20 which receives a power synchronization signal from a power synchronization circuit 22 which detects the period of the power supply voltage applied to both ends of the triac 19. Planer blade 6 when cutting material
The magnitude of the cutting load resistance applied to the plane can be ascertained by detecting an increase or decrease in the rotational speed of the plane barrel 7 to which the plane blade 6 is fastened. It also detects the rotational speed of the output shaft of the first electric motor 9 or the gears, sprockets, chains, belts, etc. of the power transmission mechanism that transmits the rotation of the first electric motor 9 to the plane body 7, the rotational passage of the plane blade 6, etc. It can also be understood by The first speed detector 12 can be a magnetic type, an optical type, a power generation type detector, etc. depending on the shape and material of the member to be detected. In this embodiment, the rotation speed of the output shaft of the first electric motor 9 is measured, but the output signal of the first speed detector 12 is a DC pulse signal or an AC pulse signal depending on the rotation speed of the first electric motor 9. The signal is obtained as a signal, and the first conversion circuit 14 converts it into an appropriate electrical signal. This first conversion circuit 14 is constituted by 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. Also, a second speed detector 13 and a second conversion circuit 15
have the same configuration as the first speed detector 12 and the first conversion circuit 14, respectively. Therefore, the voltages output from the first conversion circuit 14 and the second conversion circuit 15 have values proportional to the rotational speeds of the respective electric motors 9 and 10, so the output voltages of these conversion circuits 14 and 15 are By understanding the width of the knife mark, you can understand the width of the knife mark. That is, the width W of the knife mark is determined by the rotational speed of the electric motor 9 being N ₁ ,
If the rotational speed of the electric motor 10 is N ₂ and the appropriate proportionality constant is A, it can be expressed by the following formula.

W=A·N ₂ /N ₁ According to the above formula, if the ratio of N ₂ and N ₁ is found, the width of the knife mark can be found. Therefore, by receiving the two output signals from the conversion circuit 14 and the conversion circuit 15, finding the ratio of their voltage values, and performing appropriate voltage division processing in the setting circuit 16, an output voltage proportional to the width W of the knife mark can be obtained. I'm trying to get V ₁ .
When adjusting and indicating the width of the knife mark, if the voltage corresponding to this indicated value is V ₂ , then
In relation to the output voltage V ₁ of the setting circuit 16,
If V ₁ > V ₂ , the width of the knife mark is within the standard, and if V ₁ <V ₂ , it can be determined that the width of the knife mark is excessive. This judgment circuit is the first
is the comparison circuit 17, and when V ₁ > V ₂ , the logic is "1",
Outputs logic "0" when V ₁ <V ₂ . Further, the voltage corresponding to the rotational speed of the first electric motor 9 when the first electric motor 9 is regulated so as not to lock even if the cutting load resistance increases is V ₄ , and the output voltage of the first conversion circuit 14 is V 4 . ₃ , if V ₃ > V ₄ , the cutting load resistance is within the standard, and if V ₃ <V ₄ , it can be determined that the cutting load resistance is excessive. The second comparison circuit 18 serves as this judgment circuit, and V ₃ >
It outputs logic "1" when V ₄ and logic "0" when V ₃ <V ₄ . The output signals of the first and second comparison circuits 17 and 18 are sent to the phase control circuit 2 via an AND gate 21.
It is connected to 0. Therefore, when the cutting load resistance is within the standard and the width of the knife mark is also within the standard, that is, when cutting is performed under the conditions of V ₃ > V ₄ and V ₁ > V ₂ , the AND gate 21 is Output is logic "1"
Therefore, the phase control circuit 20 operates to increase the conduction angle of the triax 19 and increase the rotational speed of the second electric motor 10. On the other hand, if the width of the knife mark is greater than the standard, V ₁ < V ₂ and V ₃ > V ₄ , then
The output of the AND gate 21 becomes logic "0", and the phase control circuit 20 operates to reduce the conduction angle of the triax 19, slow down the rotational speed of the second electric motor 10, and bring the width of the knife mark within the standard. . When the cutting load resistance becomes excessive and V ₃ <V ₄ , the output of the AND gate 21 becomes logic "0" regardless of the output signal of the first comparison circuit 17, so the phase control circuit 20 reduces the conduction angle of the triax 19 and slows down the rotational speed of the second electric motor 10 to reduce the cutting load resistance, so that the first electric motor 9 can be prevented from being locked.

In this way, the first electric motor 9 and the second electric motor 10
and when the cutting load resistance becomes excessive while cutting the material, the rotational speed of the second electric motor 10 is controlled to reduce the material feeding speed so that the material feeding speed is reduced, Additionally, when the cutting load resistance is small, the material feeding speed is increased to keep the width of the knife mark always below a certain level. The surface can be finished smoothly.

As mentioned above, the present invention provides a material feeding speed adjustment mechanism for an automatic plane machine that makes it possible to finish the finished surface of the material smoothly. Obtainable.

[Brief explanation of drawings]

Fig. 1 is a front view of an automatic planing machine of an embodiment of the material feeding speed adjustment mechanism of the automatic planing machine of the present invention, Fig. 2 is a partial left side view of Fig. 1, and Fig. 3 is a vertical view of the automatic planing machine of the present invention. Front view, 4th
The figure is also a block circuit diagram of one embodiment. 1...Base, 2...Head, 3...Column,
4... Material feeding table, 6... Planer blade, 7... Planer body,
8... Material feeding roller, 9... First electric motor, 10...
...Second electric motor, 11...Switch, 12...First speed detector, 13...Second speed detector, 1
4...First conversion circuit, 15...Second conversion circuit, 16...Setting circuit, 17...First comparison circuit, 18...Second comparison circuit, 19...Triack (for power switching) semiconductor element), 20...phase control circuit, 21...AND gate, 22...power synchronization circuit, _L1 , _L2 ...power line.

Claims (1)

[Scope of utility model registration request] A first electric motor 9 that is connected in parallel to a power source and drives the planer blade 6, and a material feeding roller 8 that sends a material feeding member.
The automatic plane machine is equipped with a second electric motor 10 that drives the plane blade 6, and controls the speed of the second electric motor 10 according to the cutting load resistance of the plane blade 6 to adjust the material feeding speed of the material feeding roller 8. The adjustment mechanism includes a first speed detector 12 that detects the rotational speed of the planer blade 6 and a second speed detector 13 that detects the material feeding speed of the material feeding roller 8.
A first conversion circuit 14 receives the outputs of the first and second speed detectors and outputs a voltage proportional to the rotation speed of the planer blade, and a first conversion circuit 14 outputs a voltage proportional to the material feeding speed. A setting circuit includes two conversion circuits 15, calculates the ratio of the output voltage values of the first and second conversion circuits, divides the voltage appropriately, and outputs a voltage value corresponding to the width of the knife mark on the material feeding member. 16
and a first comparison circuit 17 that compares the output signal V ₁ of the setting circuit 16 with a reference signal V ₂ set in advance according to the limit value of the width of the knife mark;
a second comparison circuit 18 that compares the output signal V ₃ of the first speed detector with a reference signal V ₄ regulated in advance to prevent the first electric motor from locking;
A power switching semiconductor element 19 connected in series to the power circuit of the second electric motor, and this semiconductor element 1
9 and a phase control circuit 20 that controls the conduction angle of the semiconductor element 19 in synchronization with the frequency of the power supply, and outputs from the first and second comparison circuits are connected to the AND gate 21. A material feeding speed adjustment mechanism for an automatic planer, characterized in that the speed of the second electric motor is controlled by inputting the speed to the phase control circuit 20.