JPH01316201A - Method for preventing super finishing planer from erroneous reverse turning - Google Patents

Abstract

PURPOSE:To improve the workability and safety of a super finishing planer by a method wherein a means to detect the thickness of a lumber is provided at the portion in the lumber feeding side of a head and a means to detect the existence of the lumber is provided between said thickness detecting means and a carriage so as not to reverse the driving direction of the carriage from the normal rotation to the reverse rotation, even when the lumber is pulled back to the lumber feeding side. CONSTITUTION:When a lumber 15 is fed from the feeding side of a head 5 after the thickness of the lumber 15 is detected, the end of the lumber 15 passes a detection roller 12 and then a detector 11. As a result, a detection circuit comes into actuation so as to output a pulse signal in order to turn a feeding belt 9 reversely, resulting in sending back the lumber 15 to the feeding side after passing of the end of the lumber 15 across a planer blade 10. When the lumber 15 is sent back to the feeding side and the tip of the lumber 15 passes the detection roller 12 and, after that, the end of the lumber 15 passes the detector 11, a pulse signal is outputted from the detection circuit so as to normally rotate the feeding belt 9 after passing of the end of the lumber 15 across the detector 11. Accordingly, the danger of the sticking-out of the lumber toward a worker can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing erroneous reversal of a superfinishing planer.

[Background of the invention]

In a conventional super finishing planer, a wood detecting means is generally arranged in front of the material feeding belt in the feeding direction, and a board thickness detecting means is further arranged in front. Therefore, after the operator detects the thickness of the wood, if the worker pushes the tip of the wood to the position of the wood detection means and pulls it back again so that the tip of the wood leaves the wood detection means, the wood detection means will detect the wood. There has been a problem in that the user mistakenly assumes that the trailing edge has been detected and reverses the direction in which the material is being fed by the material feeding device. Therefore, if the worker next attempts to feed wood to the bottom of the material feeding device without noticing that the material feeding direction of the material feeding device has been reversed, the wood will be pushed out toward the worker. It was dangerous because it would happen.

Furthermore, in order to release this state, it was necessary to operate a stop switch each time to cut off the power supply to the motor, resulting in extremely poor workability.

Furthermore, in a super finishing planer in which wood detecting means are arranged before and after the material feeding device in the material feeding direction, the wood is detected by the feeding side wood detecting means and the sending fallen wood detecting means, and then the wood is sent. Although the above problem can be solved by reversing the feeding device after passing through the incoming wood detection means, in this method, the distance between the incoming and outgoing wood detection means is When cutting short pieces of wood, there is a problem in that the direction of material feeding of the material feeding device does not change from normal rotation to reverse rotation.

[Purpose of the invention]

The purpose of the present invention is to solve the problems of the prior art described above,
The objective is to improve the workability and safety of super-finish planing machines.

[Summary of the invention]

The present invention focuses on the point that the end of the wood first passes through the board thickness detection means and then passes through the wood presence/absence detection means on the feeding side. Even if the wood is fed to the wood presence/absence detecting means and then pulled back again, the wood feeding direction of the wood feeding device is not reversed.

[Embodiments of the invention]

Examples of the present invention will be described.

FIG. 1 is a front view showing a schematic configuration of a super finishing planer. A table 2 equipped with a planer blade 10 is provided on the upper part of the base 1, and a head 5 is provided above the planer blade 10, supported by a pair of columns 3 and movable up and down by a feed screw 4 and an elevating handle 14. The head 5 is provided with a driving roller 7 and a driven roller 8 driven by an electric motor 6 capable of forward and reverse rotation, and a material conveying belt 9 is stretched between both rollers. This electric motor6. Drive roller 7, driven roller 8. The material feeding belt 9 constitutes a material feeding device.

A wood board thickness detecting means is provided on the wood feed side portion of the head 5, and includes a detection roller 12 that can move up and down, and a detector 13 that detects the up and down movement of the detection roller 12. A detector 11 for detecting the presence or absence of wood is provided between the board thickness detection means and the material feeding device.

FIG. 2 is a block circuit diagram showing a specific example of the present invention,
Figure 3 (a) shows the case without detecting the thickness of the wood 15.

FIG. 3 (b) is a schematic diagram of the case where the wood 15 is pushed up to the detector 11 and then returned. The wood 15 is placed on the feeding side table 2, and the thickness of the wood 15 is measured by the detection roller 12 and the detector 13. After detecting the wood 15, the detector 11
It is a schematic diagram when it is pushed in until it is pushed in and then returned.

In FIG. 2, power supply line Q1. Normally open relay contacts 24a and 25a are connected in series to the Q, , C and U, V, and W□ terminals of the reversible motor 6, and when the normally open relay contact 25a closes, the reversible motor 6 rotates in reverse and transmits. The material conveying direction of the material belt 9 is reversed.

The detector 13 outputs a logic "L" signal when the detection roller 12 is not detecting the wood 15, and a logic rHJ signal when the detection roller 12 is detecting the wood 15.

When the detector 11 does not detect the wood 15, the logic "L" is applied.
”, outputs a logic rHJ signal when it is detected.

The holding circuit 16 changes the output from the logic rLJ to the logic rHJ by the rising signal of the output signal of the detector 13 from the logic rLJ to the logic rHJ.
The AND circuit 17 is composed of a flip-flop, etc. that inverts the logic rHJ from J to the logic rHJ.
The output signal of the detector 11 controls whether or not the output signal of the detector 11 is transmitted to the next stage.

The detection circuit 19 is configured so that the output equal sign of the NOR circuit 18 is logic r.
HJ, that is, when the material conveying belt 9 is rotating in the normal direction (when the O side output of the inversion control circuit 21, which will be described later, is the logic rLJ), and the output signal of the detector 13 is the logic rlJ, the operation becomes possible, and the AND circuit is activated. 17 output signal from logic “H” to logic “
A falling signal to "L" outputs a logic rHJ pulse signal for a certain period of time.

The detection circuit 20 detects a constant falling signal of the output signal of the detector 11 from the logic rHJ to the logic rLJ when the material conveying belt 9 is reversing (when the O side output of the reversal control circuit 21 described later is the logic rHJ). Outputs a pulse signal of time logic "H".

In the initial state of the inversion control circuit 21, the 1 side output signal is logic rHJ, and the O surveying force signal is logic "L". This inversion control circuit 21 operates at the falling edge of the pulse signal of the detection circuit 19 from logic "H" to logic "L", inverts one surveying force signal from logic rHJ to logic rLJ, and after a certain period of time O measurement Invert the force signal from logic rLJ to logic rHJ. Further, from the logic rHJ of the pulse signal of the detection circuit 20, the logic “
Contrary to the above, the O surveying force signal is inverted from logic rHJ to logic "L", and after a certain period of time, the 1 surveying force signal is inverted from logic rLJ to logic rHJ. Amplifying circuits 22 and 23 are connected to the respective outputs of the inversion control circuit 21 and energize the relay coils 24 and 25 when the logic rHJ occurs in response to the 1 side output of the inversion control circuit 21 and the O measurement force.

By energizing the relay coils 24 and 25, the normally open relay contacts 24a and 25a are alternately closed, the reversible motor 6 rotates forward and backward, and the direction of material feeding of the material feeding belt 9 is switched.

Next, the actual operation will be explained.

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

In this case, since the output signal of the detector 13 remains at the logic "L", the output signal of the holding circuit ↓6 is also at the 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 1-inversion control circuit 21 also does not change.
remains in normal rotation.

As shown in Figure 3 (b), wood 15 is placed on table 2.
On the other hand, when the head 5 is lowered, the detection roller 12
contacts the wood 15 and is pushed up, and the detector 13 is activated. At this time, the output signal of the detector 13 changes from the logic rlJ to the logic "H", and the output signal of the holding circuit 16 also goes to the logic "H".
"L" is inverted to logic rHJ, and the logic rHJ state is electrically maintained. Consider the case where the wood 15 is pushed from this state to the position of the detector 11 and then pulled back to the A position.

In this case, since the detection roller 12 is always in contact with the wood 15, the output signal of the detector 13 remains at logic "H" and the output signal from the NOR circuit 18 becomes logic rLJ. Therefore, the operation of the detection circuit 19 is blocked, and the output signal of the detector 11 is transmitted to the detection circuit 1 through the AND circuit 17.
9, the detection circuit 19 does not output a pulse signal. For this reason.

The output signal of the reversing control circuit 21 also does not change, and the material conveying belt 9
remains in normal rotation.

When cutting the wood 15 normally, the thickness of the wood 15 is first detected as shown in FIG. The signal is at logic "H" and the output signal from the holding circuit 16 is at logic rHJ. First, the leading end of the wood 15 in the material feeding direction passes through the detector 11, and then the terminal end of the wood 15 passes through the detection roller 12. and then passes through 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 rHJ,
Since the output signal of the detector 11 is inverted from logic rHJ to logic rf=J, the output signal of the AND circuit 17 is also logic rHJ.
Since the signal is inverted to logic "L" and input to the detection circuit 19, the detection circuit 19 operates and outputs a pulse signal. Due to this pulse signal, the 1 side output and 0 side output of the inversion control circuit 21 change as described above, and the excitation of the relay coil 24.25 is switched via the amplifier circuit 22.23, and the normally open relay contact 24a is opened. The normally open relay contact 25a closes and the reversible motor 6 reverses.

The material conveying belt 9 reverses, and the end of the wood 15 reaches the planer blade 10.
After passing through, the wood 15 is returned to the feeding side.

When the wood 15 is returned to the feeding side, the tip of the wood 15 (
1) passes the detector 11, and then passes the side ratio roller 12, the end of the wood 15 passes the detector 1.
It will pass through 1. Therefore, the falling signal of the logic rlJ from the logic rl(J of the output signal of the detector 11 is input to the detection circuit 20, a pulse signal is output from the detection circuit 20, and this pulse signal causes the inversion control circuit 21 to
The side output and the 0 side output change in the opposite way to the above, the normally open relay contact 25a opens, the normally open relay contact 24a closes, the reversible motor 6 rotates normally, the material conveying belt 9 rotates normally, and the wood 15 After the end of the conveying belt 9 passes the detector 11, the material conveying belt 9 returns to normal rotation.

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

In addition, in the above embodiment, a super-finishing planer was described that is equipped with a wood detection means at one location and is capable of cutting back and forth once, but by having two of the detection means, it is possible to cut back and forth twice or continuously. It goes without saying that even in the case of a super-finished planer, the same effect can be obtained by inputting the output signal of one of the wood detection means to the detection circuit 20 described above.

〔Effect of the invention〕

According to the present invention, above the table provided with the planer blade,
A head equipped with a material feeding device driven by an electric motor capable of forward and reverse rotation is arranged, and the wood is cut by passing it through a material feeding path formed between the city record table and the material feeding device. In the super finishing planer, the head includes a means for detecting the thickness of the wood, and a means for detecting the presence or absence of wood, located between the thickness detection means and the material feeding device, on the wood feeding side of the head. and feed the wood to the wood presence/absence detection means side through the board thickness detection means section described above, and feed the wood so that it leaves the next month presence/absence detection means in a state where the wood presence/absence detection means is activated. Even if it is pulled back to the side, the driving direction of the material feeding device is not reversed from normal to reverse, so the wood fed in by the worker is not pushed out toward the worker, unlike with conventional planing machines. In addition, the feeding direction of the wood fed by the wood feeding device is reversed when the rear end of the wood passes the planer blade, resulting in efficient cutting with less loss time. The work can be accomplished.

[Brief explanation of the drawing]

Figure 1 is a front view showing the schematic configuration of the super finishing planer, Figure 2
The figure is a block circuit diagram showing one embodiment of the present invention.
(a) and (b) are schematic diagrams showing the operation of the super-skilled and Nikanna board of the present invention. In the figure, 2 is a table, 5 is a head, 9 is a material conveying belt, 10 is a planer blade, 11 is a detector, 12 is a detection roller, 13 is a detector, and 15 is wood. Name of patent applicant: Hitachi Koki Co., Ltd. Haramachishi 1 Garden Ya 8

Claims (1)

[Claims] A head equipped with a material feeding device driven by an electric motor capable of forward and reverse rotation is arranged above a table equipped with a planer blade, and between the table and the material feeding device. In a super finishing planer that cuts the wood by passing the wood through a material feeding path that is formed, a means for detecting the thickness of the wood is provided on the wood feeding side portion of the head, and a means for detecting the thickness of the wood and the material feeding device are provided. and a means for detecting the presence or absence of wood located between the board and the wood, the wood is passed through the plate thickness detection means and sent to the wood presence/absence detection means, and when the wood presence/absence detection means is activated, the wood is 2. A method for preventing erroneous reversal of a super-finishing planer, characterized in that the drive direction of the material feeding device is maintained in the forward rotation direction even when the material feeding device is pulled back to the feeding side so as to move away from the wood presence/absence detecting means. ￥