JPH0649282B2 - How to prevent erroneous reversal of super-finished planers - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for preventing erroneous reversal of a superfinishing planer.

[Background of the Invention]

In the conventional super-finishing planer, generally, the wood detecting means is arranged in front of the material feeding belt in the feeding direction, and further the plate thickness detecting means is arranged in front thereof. Therefore, after the operator detects the plate thickness of the wood, the wood tip is pushed to the position of the wood detection means, and the wood tip is pulled back again from the wood detection means. There was a problem that the material feeding direction of the material feeding device was reversed due to the misunderstanding that the trailing edge was detected. Therefore, if the worker tries not to notice that the material feeding direction of the material feeding device is reversed and the worker next tries to feed the wood into the lower portion of the material feeding device, the wood is ejected to the operator side. It was dangerous because it happened. Further, in order to cancel this state, it is necessary to operate the stop switch each time to cut off the electric power supply to the electric motor, which is extremely inferior in workability.

Further, in the super finishing planer in which the wood detecting means is arranged before and after the material feeding device in the material feeding direction, the wood is fed after the feeding side wood detecting means and the sending side wood detecting means detect the wood. Although the above problem can be solved because it is a method of reversing the material feeding device after passing through the incoming side wood detecting means, in this method, it is sufficiently shorter than the distance between the incoming side and sending side wood detecting means. When cutting wood, there is a problem that the material feeding direction of the material feeding device does not reverse from normal rotation to reverse rotation.

[Object of the Invention]

The object of the present invention is to solve the above-mentioned problems of the prior art,
It is to improve workability and safety of the super finishing planer.

[Outline of Invention]

The present invention focuses on the fact that the end of the wood first passes through the plate thickness detecting means portion and then passes through the wood presence detecting means on the feeding side. It is devised so that the feeding direction of the feeding device will not be reversed even if the lumber is sent to the wood presence / absence detecting means and the wood is pulled back again.

Example of Invention

 Examples of the present invention will be described.

FIG. 1 is a front view showing a schematic configuration of a superfinishing planer. Table 2 with planer blade 10 on top of base 1
Above the planer blade 10, there is provided a head 5 which is supported by a pair of columns 3 and can be moved up and down by a feed screw 4 and a lifting handle 14. In the head 5,
A drive roller 7 and a driven roller 8 driven by an electric motor 6 that enables normal rotation and reverse rotation are arranged, and a material feeding belt 9 is stretched between both rollers. The electric motor 6, the driving roller 7, the driven roller 8 and the material feeding belt 9 constitute a material feeding device.

At the wood feeding side of the head 5, there is provided a wood plate thickness detecting means including a vertically movable detection roller 12 and a detector 13 for detecting the vertical movement of the detection roller 12. A detector 11 for detecting the presence or absence of wood is provided between the plate thickness detecting means and the material feeding device.

FIG. 2 is a block circuit diagram showing a specific example of the present invention.
FIG. 3A shows the wood 15 without detecting the plate thickness of the wood 15.
Fig. 3 (b) is a schematic view of the case in which the wood 15 is pushed to the detector 11 and then returned.
It is placed on top of the wood 1 by the detection roller 12 and the detector 13.
It is a schematic diagram at the time of pushing the wood 15 to the detector 11, and returning it after detecting the board thickness of No. 5.

In FIG. 2, the power supply lines l ₁ , l ₂ , l ₃ and the U ₁ , V ₁ , W ₁ terminals of the reversible motor 6 are connected in series to the normally open relay contact 24.
When a and 25a are connected and the normally open relay contact 25a is closed, the reversible motor 6 is rotated in the reverse direction, and the material feeding direction of the material feeding belt 9 is reversed.

The detector 13 outputs a logic "L" signal when the detection roller 12 does not detect the wood 15 and a logic "H" signal when the detection roller 12 detects the wood 15.

The detector 11 outputs a signal of logic "L" when the wood 15 is not detected and outputs a logic "H" when the wood 15 is detected.

The holding circuit 16 is composed of a flip-flop or the like that inverts its output from the logic “L” to the logic “H” in response to the rising signal from the logic “L” to the logic “H” of the output signal of the detector 13. The AND circuit 17 is the holding circuit 1
The output signal of 6 regulates whether or not the output signal of the detector 11 is transmitted to the next stage.

In the detection circuit 19, the output signal of the NOR circuit 18 is logic "H".
That is, when the material feeding belt 9 is in the normal rotation (when the 0 side output of the reversal control circuit 21 described later is logic “L”) and the output signal of the detector 13 is logic “L”, the operation becomes possible. ,
The logic "H" to the logic "L" of the output signal of the AND circuit 17
A pulse signal of logic "H" is output for a certain period of time as a falling signal to the.

The detection circuit 20 changes the output signal of the detector 11 from logic “H” to logic “L” while the material feeding belt 9 is rotating in reverse (when the 0 side output of the reversal control circuit 21 described later is logic “H”). As a falling signal, a pulse signal of logic "H" is output for a certain period of time.

In the inversion control circuit 21, the 1-side output signal is logic “H” and the 0-side output signal is logic “L” in the initial state. The inversion control circuit 21 operates at the fall of the logic “H” to the logic “L” of the pulse signal of the detection circuit 19, inverts the one-sided output signal from the logic “H” to the logic “L”, and continues for a certain time. The rear 0 side output signal is inverted from the logic "L" to the logic "H". Also,. The detection circuit 20 operates at the trailing edge of the logic "H" to the logic "L" of the pulse signal, and conversely to the above, the 0-side output signal is inverted from the logic "H" to the logic "L", and after a fixed time. 1
The side output signal is inverted from logic "L" to logic "H". The amplifier circuits 22 and 23 receive the 1-side output and the 0-side output of the inversion control circuit 21, respectively, and are connected to each other to excite the relay coils 24 and 25 when they are logic “H”. The normally open relay contact 24 is generated by exciting the relay coils 24 and 25.
a and 25a are alternately closed, the reversible motor 6 is rotated in the normal direction and the reverse direction, and the feeding direction of the feeding belt 9 is switched.

Next, the actual operation will be described.

As shown in FIG. 3 (a), when the wood 15 is not in contact with the detection roller 12 (the plate thickness is not detected),
Consider a case where the wood 15 is pushed to the position of the detector 11 and is pulled back to the position A again.

In this case, since the output signal logic of the detector 13 remains “L”, the output signal of the holding circuit 16 is also logic “L”.
Therefore, the output signal of the detector 11 is blocked by the AND circuit 17, the output signal of the detection circuit 19 does not change, and the output signal of the inversion control circuit 21 does not change, so that the material feeding belt 9
Remains normal.

As shown in FIG. 3B, the wood 15 placed on the table 2
On the other hand, when the head 5 is lowered, the detection roller 12
Comes into contact with the wood 15 and is pushed up, and the detector 13 operates. At this time, the output signal of the detector 13 changes from the logic “L” to the logic “H”, and the output signal of the holding circuit 16 is also inverted from the logic “L” to the logic “H” and electrically changes to the logic “H”. State is retained. From this state, the wood 15 is detected by the detector 11
Consider the case where the position is pushed to the position of and is pulled back to the position of A again.

In this case, since the detection roller 12 is always in contact with the wood 15, the output signal of the detector 13 remains the logic “H” and the output signal of the NOR circuit 18 is the logic “L”. Therefore, the operation of the detection circuit 19 is blocked, and the output signal of the detector 11 is transmitted through the AND circuit 17 to the detection circuit 1
The pulse signal is not output from the detection circuit 19 even if the pulse signal is input to 9. Therefore, the output signal of the reversal control circuit 21 does not change, and the material feeding belt 9 remains in the normal rotation.

When the lumber 15 is normally fed and cut, the thickness of the lumber 15 is first detected and then the lumber 15 is fed from the feeding side of the head 5, as shown in FIG. The signal is logic "H" and the output signal of the holding circuit 16 is logic "H". First, the tip of the wood 15 in the material feeding direction passes through the detector 11, and then the end of the wood 15 is detected. It will pass the roller 12 and then the detector 11. Therefore, the output signal of the detector 13 is logic "L",
That is, when the output signal of the NOR circuit 18 is logic "H",
Since the output signal of the detector 11 is inverted from the logic “H” to the logic “L”, the output signal of the AND circuit 17 is also inverted from the logic “H” to the logic “L” and input to the detection circuit 19, The detection circuit 19 operates and outputs a pulse signal. With this pulse signal, the 1-side output and the 0-side output of the inversion control circuit 21 change as described above, the excitation of the relay coils 24 and 25 is switched via the amplifier circuits 22 and 23, and the normally open relay contact 24a opens. The normally open relay contact 25a is closed, the reversible motor 6 is rotated in the reverse direction, the material feeding belt 9 is rotated in the reverse direction, and the end of the wood piece 15 passes through the planer blade 10, and then the wood piece 15 is returned to the feeding side. When the timber 15 is returned to the sending side,
The tip of the wood 15 (right side in FIG. 1) is the detector 11
After passing through the detection roller 12 and then the wood 15
Will pass through the detector 11. Therefore, a falling signal of logic “H” to logic “L” of the output signal of the detector 11 is input to the detection circuit 20, and a pulse signal is output from the detection circuit 20. This pulse signal causes the inversion control circuit 21 The 1-side output and 0-side output change in reverse to the above,
The normally open relay contact 25a opens, the normally open relay contact 24a closes, the reversible motor 6 rotates in the normal direction, and the material feeding belt 9 rotates in the normal direction.
After the end of the wooden piece 15 passes through the detector 11, the material feeding belt 9 returns to the normal rotation.

As described above, when the wooden piece 15 is pushed to the position where the detector 11 detects the wooden piece 15 and the wooden piece is pulled back again, the material feeding belt 9 can be prevented from reversing.

In addition, in the above-mentioned embodiment, the superfinishing planer having the wood detecting means provided at one place and capable of performing the reciprocating once is described. However, by having the two detecting means, the reciprocating twice or the continuous reciprocating cutting is possible. Even in such a super-finished planer, it goes without saying that the same effect can be obtained by inputting the output signal of one of the wood detecting means to the above-mentioned detection circuit 20.

〔The invention's effect〕

According to the invention, above a table with a planer blade,
A head provided with a material feeding device driven by an electric motor capable of normal rotation and reverse rotation is arranged, and wood is passed through a material feeding path formed between the table and the material feeding device to cut the wood. In the super finishing planer, a means for detecting the thickness of the wood on the wood feeding side portion of the head, and a means for detecting the presence or absence of the wood, which is located between the thickness detecting means and the material feeding device. Is provided, and the wood is sent through the plate thickness detecting means to the wood presence detecting means side, and the wood is pulled back to the sending side so as to separate from the wood presence detecting means in a state in which the wood presence detecting means is operated. However, since the driving direction of the material feeding device is not reversed from the normal rotation to the reverse rotation, the wood fed by the worker is projected toward the worker side unlike the conventional planer. Danger In addition, the reversing position of the feeding direction of the timber fed by the feeding device is performed when the end of the timber passes through the planer blade, so that efficient cutting work with less loss time can be realized. it can.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic structure of a super finishing planer, and FIG.
FIG. 3 is a block circuit diagram showing an embodiment of the present invention, and FIGS. 3 (a) and 3 (b) are schematic views showing the manner of operation in the superfinishing planing board of the present invention. In the figure, 2 is a table, 5 is a head, 9 is a material feeding belt, 10 is a planer blade, 11 is a detector, 12 is a detection roller, 13 is a detector, and 15 is wood.

Claims (1)

[Claims] 1. A head provided with a material feeding device driven by an electric motor capable of normal rotation / reverse rotation is arranged above a table having a planer blade, and is formed between the table and the material feeding device. In a super-finishing planer that cuts the wood through a wood feeding path, a means for detecting the thickness of the wood at the wood feeding side of the head, and a means for detecting the thickness of the wood and the feeding device. And a means for detecting the presence or absence of lumber is provided, the lumber is passed through the plate thickness detecting means portion and fed to the lumber presence / absence detecting means side, and the lumber is in the state in which the lumber presence / absence detecting means is operated. A method for preventing erroneous reversal of a superfinishing planner, characterized in that the driving direction of the material feeding device is maintained in the forward rotation direction even if the feeding device is pulled back away from the wood presence detection means.