JP3596632B2 - Wood processing machine - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a woodworking machine that performs cutting by reciprocating a material by a material feeding device having a variable material feeding speed.
[0002]
[Prior art]
The material placed on the table is reciprocated by the material feeding device, and the material is sent in the direction of arrow A in FIG. 1 in a woodworking machine that cuts the upper surface of the material with a plane blade in the return path (the direction of arrow B in FIG. 1). When the direction of rotation of the material feeding device is reversed after the material is fed, and the direction of material feeding is reversed in the direction B, the end position of the material in the material feeding direction is between the plane blade 4 and the vicinity of the right end of the driving roller 5. (The interval of L2 in FIG. 1). Because, for example, if the material is reversed when the end position of the material is located before the plane blade, the upper surface of the material located before the plane blade is not cut by the plane blade, and Will be sent to Conversely, if the end position of the material is located on the left side of FIG. 1 from the vicinity of the end of the material feeding device, even if the material is rotated in the direction B by reversing the rotation direction of the material feeding device, the material is not transferred to the material feeding device. The material cannot be fed in the B direction because it is not supported above.
Further, in a small-sized wood processing machine, the distance L2 described above is inevitably shortened, so that the reverse rotation position of the material must be performed with higher accuracy.
[0003]
Conventionally, Japanese Unexamined Patent Publication (Kokai) No. 62-239880 discloses a method for eliminating variations in the reverse rotation position during reciprocation (reversing the material feeding direction within a range of a distance L2). This wood processing machine is a so-called super-finishing plane machine that reciprocates the material by a forward / reverse operation of a material feeding device and cuts it with a plane blade. A pulse generating means is provided for material feeding control, and the number of pulses is counted. Using a distance counting circuit, the material feeding distance is measured, and when it reaches a certain distance, the material feeding device is deenergized and the material is sent by inertia. Stop and allow reverse transfer material. This eliminates variations in the reverse rotation position of the material during reciprocation.
[0004]
Another example is disclosed in JP-A-57-142302. This is called the same super-finishing plane as described above, receives the output from the distance measuring means, measures the feeding distance of the material, and when it reaches a certain distance, deactivates the feeding device, The inertia feeding is performed, the cycle width of the pulse output from the distance measuring means is compared with a preset width, and when the width becomes large, the feeding apparatus is reversed to reciprocate the material.
[0005]
[Problems to be solved by the invention]
According to the conventional method disclosed in Japanese Patent Application Laid-Open No. 62-239880, regardless of the material feeding speed, inertia feeding is performed after a certain feeding distance is fed and before an electromagnetic brake is operated. In addition, due to the difference in the warp, the inertial feed distance slightly fluctuated, and an accurate reverse position of the material could not be obtained. In particular, in the case where the material feeding speed of the material feeding device can be changed, furthermore, the variation of the amount of inertia is added, the reverse rotation position is not determined at all, and if the reciprocating motion is repeated, the material is changed as described above. Cutting residue occurs. In addition, if the electromagnetic brake is not regularly maintained, the braking force changes, and the braking force changes.
[0006]
According to Japanese Patent Application Laid-Open No. 57-142302, no maintenance is required for the brake means because the brake means is not used, but the inertia feeding distance cannot be measured only by comparing the pulse width, and the reverse position of the material is fixed. There is no problem.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the wood processing machine and accurately perform the reverse position of the material feeding.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a table and an elevating body opposed to the table are provided, and a processing blade and a material feeding device are provided on one of the table and the elevating body, and a table is provided between the table and the elevating body. In a wood processing machine provided with a speed change means for forming a material path, reciprocating the material by the material feeding device and reciprocating the material by a processing blade, and changing a material feeding speed of the material feeding device, An end detecting means for detecting a signal at the end is provided at an appropriate position in the material feeding path, a distance measuring means for outputting a signal proportional to a material feeding distance is provided in the material feeding apparatus, and a signal proportional to a shift of the speed change means is output. Speed detecting means, and an electric braking means for the material feeding device, and receives the signal of the end detecting means, the signal of the distance measuring means and the signal of the speed detecting means, and detects the reversing position of the reciprocating motion of the material feeding device. With control means for controlling That.
[0009]
[Action]
The material feeding device of the wood processing machine configured as described above emits a signal when the end detector provided in the material feeding path detects the end of the material. This signal is received by the control means, and the control means drives the distance measuring means to measure the feeding distance at the end of the material, and at the same time receives the signal from the speed detecting means to detect the material feeding speed of the material feeding device.
In the control means, a feeding distance corresponding to the material feeding speed of the material feeding apparatus is set in advance, and the control means receives a signal from the speed detecting means, calculates a predetermined feeding distance, and compares the distance with the distance measuring means. Then, when the distance of the distance measuring means reaches a predetermined feeding distance, the control means deactivates the material feeding device and decelerates the feeding of the material feeding device with a predetermined braking force by the electric braking means. At the same time, the control means measures the deceleration distance from the start of deceleration by the distance measuring means, and when the deceleration transport distance reaches a preset deceleration distance, causes the feeder device to reverse-transfer the material.
[0010]
【Example】
One embodiment of the present invention will be described with reference to FIGS. In this embodiment, a description will be given of a super finishing plane machine as an example of a wood processing machine.
In the drawing, a head 3 serving as an elevating body is supported on the upper ends of columns 2 and 2 erected in parallel at a rear part of a table 1, and a plane blade 4 serving as a processing blade is adjustable at a central portion of the head 3 so as to be adjustable. It is arranged. A pair of driving rollers 5 and a driven roller 6 are pivotally supported in front of and below the head 3 above the table 1, and a belt-type feeding member 7 is stretched over these rollers 5, 6. , 6 and the material feeding member 7 constitute a material feeding device. Note that the material feeding device may use a plurality of rollers instead of the belt.
[0011]
A motor 8 for driving a material feeding member 7 is provided in the table 1. The motor 8 is provided with an endless belt 14 extending between a pulley 12 and a pulley 13 provided on the driving roller 5. From the rollers 5, 6 via the pulley 12, the endless belt 14, the pulley 13, and the driving roller 5 in the forward and reverse directions.
The speed of the motor 8 can be changed by a speed change means including an inverter 9 and a rotary variable resistor 10 provided in the inverter 9. A speed detecting resistor 11 serving as speed detecting means for rotating in synchronization with the variable resistor 10 is provided on the rotation center axis of the variable resistor 10. Detect the material feeding speed.
[0012]
A feed screw 16 that is rotated by a lifting motor 15 is fitted to the table 1, and the head 3 is supported on the upper end of the feed screw 16 so that the head 3 can move up and down with the columns 2 and 2 as guides.
[0013]
The gap between the material feeding member 7 and the head 3 which is a material feeding path of the material 17 is adjusted by activating the elevating motor 15 by the elevating operation switch 18 and elevating the head 3 via the feed screw 16. You. A material thickness detector 19 is mounted on the right end of the lower surface of the head 3 in FIG. 1 and the head 3 is lowered to contact the upper surface of the material 17 placed on the table 1 and the material thickness is detected. The detector 19 outputs a detection signal. An end detector 20 for detecting the end 17a, 17b of the material 17 in the material feeding direction is provided inside the lower surface of the head 3 by the material thickness detector 19, and the end 17a or the end 17b is removed from the end detector 20. At this time, a detection signal is issued from the termination detector 20.
[0014]
Next, the control configuration of the material feeding device will be described with reference to the block diagram of FIG. 3. A pulse generator 22 serving as a distance measuring unit that outputs a pulse proportional to the rotation of the driving roller 5 is provided at the shaft end of the driving roller 5. The output signal is provided to the controller 21. A regenerative braking circuit 23 serving as an electrical braking means for the motor 8 is provided in the inverter 9, and the regenerative braking circuit 23 is driven when a stop signal is input to the inverter 9. Note that, instead of the regenerative braking circuit 23, a DC braking circuit as an electric braking means may be used. The inverter 9 is preset with only one deceleration gradient (speed / time) of the regenerative braking circuit 23, that is, only one braking force. A control signal for controlling the inverter 9 is output from the controller 21, and the regenerative braking circuit 23 is driven via the inverter 9. The controller 21 is connected to the above-described material thickness detector 19, end detector 20, and elevating operation switch 18. Further, as will be described later, the feeding distance corresponding to the feeding speed of the feeding member 7. Data L1 and L1 ', braking distance data L2 and L2' during deceleration, and a predetermined deceleration time T1 are set in advance. The controller 21 uses a known microcomputer, sequencer, digital IC circuit, or the like.
[0015]
In the above configuration, the material 17 is fed in the direction A on the table 1, and after the end 17a (right end) of the material 17 passes over the plane blade 4, the feeding direction of the material feeding member 7 is reversed, and The case where the upper surface of the material 17 is cut by the plane blade 4 will be described with reference to FIG. First, the head 3 is moved up and down to make the distance between the material feeding member 7 and the head 3 equal to or higher than the height of the material 17 to be cut, and then the material 17 is placed under the material thickness detector 19 provided on the head 3. It is placed on the table 1 and the head 3 is lowered. As a result, the material thickness detector 19 also descends and comes into contact with the upper surface of the material 17 so that a detection signal is output from the material thickness detector 19. This signal is received by the controller 21 to stop the lowering operation of the head 3 and, at the same time, drive the inverter 9 to rotate the motor 8. The rotation speed of the motor 8 at this time is determined by a signal of the variable resistor 10 connected to the inverter 9.
[0016]
When high speed (V1) is set by the variable resistor 10, the motor 8 rotates at the speed V1, rotates the drive roller 5 via the endless belt 14, and circulates the material feeding member 7 in the direction of arrow A at the speed of V1. Let me forward. Next, when the material 17 is placed on the material feeding member 7, the material 17 is transported in the direction of arrow A. When the termination detector 20 detects the termination 17 a of the material 17, a detection signal is output from the termination detector 20, and in response to this signal, the controller 21 controls the speed synchronized with the variable resistor 10 provided in the variable resistor 10. The rotation speed of the motor 8, that is, the material feeding speed of the material 17 is detected based on the signal of the detection resistor 11. Upon receiving this signal, the controller 21 calculates a material feeding distance L1 and a braking distance L2 during deceleration that match the detected material feeding speed. At the same time as receiving the detection signal of the end detector 20, the controller 21 counts the pulse signal generated from the pulse generator 22.
[0017]
Next, when counting the number of pulses corresponding to the material feeding distance L <b> 1, the controller 21 sets the count to “0” and outputs a stop signal to the inverter 9. Then, the inverter 9 drives the regenerative braking circuit 23 to decelerate the motor 8 at a predetermined deceleration gradient (speed V1 / time T1). At the same time, the controller 21 counts a pulse signal corresponding to a preset braking distance L2 during deceleration by the pulse generator 22, and when the terminal 17a of the material 17 reaches the position shown in FIG. A reverse drive signal is issued to rotate the motor 8 in the reverse direction. The material 17 is returned in the direction of arrow B. At this time, the upper surface of the material 17 is cut by the plane blade 4. Next, when the end 17b (left end) of the material 17 passes through the plane blade 4 and the end detector 20 detects the end 17b and outputs a detection signal, the controller 21 stops the inverter 9 in response to this signal. Output a signal. Thereby, the motor 8 is stopped.
[0018]
Exceptionally, the material 17 may stop before reaching the braking distance L2 due to warpage of the material 17 or a joint. In this state, since the distance L2 has not been reached, the controller 21 does not output a reverse drive signal to the inverter 9 and the material 17 is stopped without reversing the material feeding direction. Therefore, by providing the predetermined deceleration time T1, even if the end 17a of the material 17 does not reach the distance L2, the controller 21 outputs a reverse drive signal to the inverter 9 after the deceleration time T1 elapses. Thus, the material feeding direction of the material 17 is reversed. In the present embodiment, the deceleration time T1 is set to be the same as the time when the material 17 moves the braking distance L2 when the material feeding speed is the high speed V1.
[0019]
Next, the case where the variable resistor 10 is adjusted to V2 (low speed) will be described. Since the speed detecting resistor 11 operates in synchronization with the variable resistor 10, it outputs a speed signal corresponding to V2. The controller 21 receives this signal and calculates the distance L1 ′ and the braking distance L2 ′ during deceleration. When the end detector 20 detects the end 17a of the material 17 as in the case of the speed V1 (high speed), a detection signal is output from the end detector 20, and in response to this signal, the controller 21 sets the speed detection resistor. The number of rotations of the motor 8, that is, the feeding speed of the material 17 is detected by the signal 11. Upon receiving this signal, the controller 21 calculates a material feeding distance L1 'and a braking distance L2' at the time of deceleration that match the detected material feeding speed. At the same time as receiving the detection signal of the end detector 20, the controller 21 counts the pulse signal generated from the pulse generator 22.
[0020]
Next, when the controller 21 counts the number of pulses corresponding to the material feeding distance L1 ′, sets the count to “0” and outputs a stop signal to the inverter 9, the inverter 9 drives the regenerative braking circuit 23, The motor 8 is decelerated at a predetermined deceleration gradient (speed V2 / time T1). At the same time, the controller 21 counts the pulse signal generated from the pulse generator 22. The controller 21 counts a pulse signal corresponding to a preset braking distance L2 ′ during deceleration, and outputs a reverse drive signal to the inverter 9 when the end 17a of the material 17 reaches the position shown in FIG. Then, the motor 8 is rotated in the reverse direction. Subsequent steps are the same as in V1 (high speed).
[0021]
Therefore, since the material 17 reverses at the feeding distance of the material at the material feeding speed, variations in the reverse rotation position are reduced.
[0022]
In the above-described embodiment, a super-finishing plane machine by reciprocal cutting is described as an example. However, the same effect can be obtained by using the above-described configuration for a planer board for reciprocal cutting. In addition, although the speed is detected by the speed detecting resistor 11, the speed is directly detected by providing the speed detecting means in the material feeding device, or by measuring the pulse signal width or the pulse signal period of the distance detecting means. The speed may be detected.
[0023]
In the above-described embodiment, since the end of the material at the time of reverse rotation is a fixed position, that is, the distance L (L1 + L2) that the material 17 travels is always constant and the braking force at the time of deceleration is constant, so that L = L1 + L2 is satisfied. For this purpose, it is necessary to determine the distance based on the signal of the speed detecting means and change L1 and L2 according to the material feeding speed. When the material feeding speed is high, the feeding distance L1 is short and the braking distance L2 is long. When the material feeding speed is low, the feeding distance L1 is long (L1 ') and the braking distance L2 is short (L2'). I have.
[0024]
As another embodiment, as shown in FIG. 5, by changing the deceleration gradient (V1 / T1, V2 / T1), that is, the braking force in accordance with the material feeding speed, L1 and L2 regardless of the material feeding speed. It is also possible to set the end of the material at the time of reverse rotation to a fixed position as described above by always making the braking force at the braking distance L2 high when the material feeding speed is high and weakening the braking force when the material feeding speed is low. .
[0025]
【The invention's effect】
According to the present invention, the speed and the distance of the material feeding device are detected, and the reverse rotation position corresponding to the speed is determined. In addition, there is little variation in the reverse rotation position, and the material feeding direction can be reversed within a predetermined range. Therefore, accurate and high-precision reversal is possible even with a small wood processing machine, and the material can be reciprocated reliably.
Further, since no mechanical mechanism is used for the braking means, there is no need for maintenance, and workability is improved.
[Brief description of the drawings]
FIG. 1 is a front view of a super-finishing plane machine showing one embodiment of the present invention.
FIG. 2 is a front view of the super-finishing plane machine while feeding materials.
FIG. 3 is a block diagram of the present invention.
FIG. 4 is an explanatory diagram showing an operation state at the time of material feeding.
FIG. 5 is an explanatory view showing an operation state at the time of material feeding in another embodiment.
[Explanation of symbols]
Reference numeral 5: drive roller, 6: driven roller, 7: feed member, 8: motor, 9: inverter, 10: variable resistor, 11: speed detection resistor, 17: material, 17a, 17b: end of material, 20 ... Terminal detector, 21 ... Controller, 22 ... Pulse generator, 23 ... Regenerative braking circuit.

Claims (3)

A table and a lifting / lowering body opposed to the table, wherein one of the table and the lifting / lowering body is provided with a processing blade and a material feeding device, and a material feeding path is formed between the table and the lifting / lowering body; In a woodworking machine provided with a speed changing means for changing the material feeding speed of the material feeding device, the material is reciprocated and processed by a processing blade, and the material is provided at an appropriate position in a material feeding path, and the material feeding direction is changed. Terminal detecting means for outputting a signal of the terminal, distance measuring means for outputting a signal proportional to a material feeding distance of the material feeding apparatus, speed detecting means for outputting a signal proportional to an output signal of the speed changing means, Electrical braking means for the material feeding device, and control means for receiving a signal from the end detecting means, a signal from the distance measuring means and a signal from the speed detecting means, and controlling a reversing reverse position of the material feeding device, The means is a signal of the end detecting means. When it is determined from the signal of the distance measuring means that the material feeding distance corresponding to the signal of the speed detecting means has been received from the signal, the feeding of the material feeding device is decelerated by the electric braking means, A woodworking machine characterized in that, when it is determined from the signal of the distance measuring means that the decelerated feeding distance corresponding to the signal of the speed detecting means has been reached, the feeding apparatus is reversed. 2. The method according to claim 1, wherein the distance measuring unit is a pulse type distance measuring unit that outputs a pulse signal, and the speed detecting unit detects a material feeding speed by measuring a period or width of a pulse output. Wood processing machine. A table and a lifting / lowering body opposed to the table, wherein one of the table and the lifting / lowering body is provided with a processing blade and a material feeding device, and a material feeding path is formed between the table and the lifting / lowering body; In a woodworking machine provided with a speed changing means for changing the material feeding speed of the material feeding device, the material is reciprocated and processed by a processing blade, and the material is provided at an appropriate position in a material feeding path, and the material feeding direction is changed. Terminal detecting means for outputting a signal of the terminal, distance measuring means for outputting a signal proportional to a material feeding distance of the material feeding apparatus, speed detecting means for outputting a signal proportional to an output signal of the speed changing means, Electrical braking means for the material feeding device, and control means for receiving a signal from the end detecting means, a signal from the distance measuring means and a signal from the speed detecting means, and controlling a reversing reverse position of the material feeding device, The means is a signal of the end detecting means. When it is determined from the signal of the distance measuring means that the material feeding distance has reached the predetermined distance after receiving the signal, the electric braking means uses the braking force according to the signal of the speed detecting means to apply the braking force of the material feeding apparatus. A woodworking machine characterized in that the feeding device is rotated in a reverse direction when the speed of the feeding is reduced, and it is determined from the signal of the distance measuring means that the reduced speed feeding distance has reached a predetermined distance.

Images