JPH0524486Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a motor control device for cutting a workpiece in a tenoning machine having an automatic lifting and lowering function.

[Background of the idea]

In conventional mortise machines with automatic lifting and lowering functions,
There are automatic operation mode and manual operation mode for removing tenons on workpieces. In automatic operation mode, operate the automatic operation switch to rotate the circular saw and cut at a predetermined descending speed, and after cutting is completed,
In this mode, a series of operations from stopping the circular saw to raising the head and returning it to a predetermined position are performed in one operation. Manual operation mode means (1) starting the circular saw, (2) setting the descending speed, (3) lowering the head to continue cutting, (4) stopping the descending after cutting is completed, (5) This is a mode in which the above operations are performed by sequentially operating each of the individually provided operation switches: () raising the head portion to an arbitrary position and stopping it; and (6) stopping the rotation of the circular saw.

The manual operation mode is used when aligning a vertical or horizontal circular saw with the ink line marked on the workpiece. It is necessary when performing the work of matching with the inked lines.

However, in this manual operation mode, the operator has to operate a number of switches to perform the operations (1) to (6) described above, and the switch operations are not easy.

Furthermore, since the switch between automatic operation mode and manual operation mode was selected by the operator using a separately provided switch, it was difficult to switch from automatic operation mode to manual operation mode, or vice versa. This required a person to operate multiple switches, and the workability of the tenon removal work was not good.

Therefore, in automatic operation mode, slowly lower the head and align the cutting edge of the circular saw with the black dot line marked on the workpiece. If the saw does not line up with the black dot line, lower the head. A request is made for a tenoning machine that is structured so that only the lowering operation can be stopped, the head section can be raised and lowered manually, and the position of the workpiece or circular saw can be appropriately adjusted, and then the tenoning work can be continued immediately in automatic operation mode. This is what was being done.

[Purpose of invention]

The present invention eliminates the drawbacks of the prior art described above,
To simplify and improve the safety of marking line alignment work in mortising work, and to enable switching from automatic operation mode to manual operation mode and return to automatic operation mode, improving workability of tenon removal work. It is to be.

[Summary of the idea]

With this invention, when the speed adjustment switch that adjusts the descending speed of the head section is changed to stop while mortising work is being performed in automatic operation mode, the descending speed of the head section must first be stopped, and then the head section can be manually adjusted. We focused on the fact that if it was possible to move up and down, it would be easier to perform the marking line alignment work. During automatic operation mode, when the speed adjustment switch instruction is checked and a stop command is given, manual operation by operating the manual up/down switch is performed. In addition to enabling the automatic operation mode and considering safety during the manual operation mode, the arithmetic circuit has been devised to return to the automatic operation mode when the speed adjustment switch is changed to a command other than stop.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a tenon removal machine, and FIG. 2 is a diagram of an operation panel.

In FIG. 1, a head portion 5 is provided so as to be slidable in the vertical direction and guided by a column 4 erected from a base 3 having a vice mechanism portion 2 for holding a workpiece 1 therebetween. This head portion 5 includes a pair of vertical circular saws 6 and horizontal circular saws 7, and both of these circular saws 6, 7.
An electric motor 8 (hereinafter abbreviated as _M1 ) and a drive transmission mechanism (not shown) are provided. The screw shaft 9 is erected on the base 3 so as to be parallel to the column 4, and screwed into the head portion 5 so as to be movable up and down. The upper ends of the column 4 and the screw shaft 9 are supported by the bridge part 10, and the screw shaft 9
is the electric motor 11 (hereinafter referred to as
Abbreviated as _M2 . ) via a drive transmission mechanism. Therefore, by rotationally driving _M2 , the head portion 5 can be raised and lowered. The lower limit position of the lifting range of the head section 5 is determined by the bar 12 provided on the base 3 and the lower limit detector 14 provided on the head section 5, and the upper limit position is determined by the bar 12 provided on the head section 5.
are detected by the upper limit detector 15 provided in the bridge section 10, and the range of elevation is regulated.
A cut limit detector 16 is disposed below the head portion 5 for regulating the range of cuts that can be made by the vertical circular saw 6 and the horizontal circular saw 7. This depth of cut limit detector 16 is designed to prevent damage to each mechanism when attempting to perform tenon removal work beyond the range of tenon dimensions that can be cut at one time. This is provided for the purpose of preventing this, as there is a risk that the workpiece material 1 may be damaged. Furthermore, if the protective cover 17 is opened in the direction of A in FIG. 1 while the circular saws 6 and 7 are rotating, there will be a danger to the operator, so an opening detector 18 is installed to detect the opening of the protective cover 17. is provided above the head portion 5.

The operation panel 19 shown in FIG. 2 includes an automatic operation switch 20 and a stop switch 21 for operating and stopping M ₁ and M ₂ in automatic operation mode, and a stop switch 21 for driving M ₂ in manual operation mode and controlling the head section. 5, a speed adjustment switch 24 that can instruct the descending speed of the head part 5 in multiple stages including stopping, and a raising and returning position of the head part 5 in multiple stages after the tenon removal work is completed. A return position adjustment switch 25 that can be instructed is provided.

In the case of general tenoning work, operate the automatic operation switch 20 in the operation panel 19 to set the automatic operation mode, first start _M1 , rotate both circular saws 7 and 8, and then Then, the _M2 is activated at the speed instructed by the speed adjustment switch 24, the head portion 5 is lowered, and the workpiece 1 held by the vice mechanism portion 2 is cut to a predetermined tenon size. However, if the workpiece material 1 is marked with a black line,
In order to align this ink line with the blade edges of both circular saws 7 and 8, the operator operates the speed adjustment switch 24, slowly lowers the head 5, and confirms whether or not they are aligned with this ink line. become. When it matches the black line, operate the speed adjustment switch 24,
Increase the descending speed and perform tenon removal. If it does not match the marked line, the speed adjustment switch 24 instructs to stop, interrupts the automatic operation mode, and stops the head section 5 from descending. While the speed adjustment switch 24 is instructing to stop, the machine is in manual operation mode, and the head section 5 is manually raised and lowered by operating the lower switch 22 and the higher switch 23, and the workpiece 1,
Alternatively, after suitably adjusting the positions of both circular saws 7 and 8 and aligning the marking lines, change the instruction of the speed adjustment switch 24 other than stopping, return to automatic operation mode, and lower the head 5 again. , Perform tenon processing.

When the tenoning of the workpiece 1 is completed, the bar 12 disposed on the base 3 is detected by the lower limit detector 14 disposed on the descending head portion 5, and the rotation of M ₁ and M ₂ is stopped. Thereafter, the _M2 is reversed, the head portion 5 is raised, returned to the position instructed by the return position adjustment switch 25, and stopped to complete the series of tenon removal operations.

As described above, while operating the automatic operation switch 20 and driving in the automatic operation mode, while checking the instruction of the speed adjustment switch 24 that adjusts the descending speed, if the command is to stop, the automatic operation mode By interrupting the process and switching to a manual operation mode in which the head section can be manually raised and lowered, it becomes easier to match the marking lines during the tenon removal work. For this reason, workers do not have to pay attention to the switching operation between automatic operation mode and manual operation mode, and without being particularly conscious of manual operation mode, they can switch to manual operation mode for matching the marked lines in automatic operation mode. After completing the marking line alignment work, by changing the instruction of the speed adjustment switch 24 to something other than stopping, it is possible to quickly return to the automatic operation mode,
You can continue mortising.

The operation of the present invention will be explained below using the block circuit diagram shown in FIG. In Figure 3, the power line and
Connect the normally open relay contact 26a in series between _M1 ,
On the other hand, the normally open relay contacts 27a, 28a and the triax 29 are connected in series between the power line and _M2 so as to enable forward and reverse rotation, and the phase control circuit 30 is connected via the normally open relay contact 27a between the power lines. are connected. The phase control circuit 30 connects the power line to L.
is input to the N terminal, a direct current power supply Vc is generated internally, and the voltage is specified in multiple stages in advance by the resistors 31 to 35 connected in series and parallel between this power supply Vc and the N terminal, and the open/closed states of switches 36 to 39. A speed voltage Vf corresponding to the rotational speed of _M2 , that is, the descending speed of the head section 5 is generated, and the rotational speed of _M2 is detected by the speed detector 40.
The frequency signal detected by the
It is converted into a DC voltage Va by a voltage converter, and the magnitudes of the above-mentioned Vf and Va are compared. When Vf>Va and when Vf<Va, the conduction angle of the triac 29 is controlled to increase or decrease, and the speed voltage Vf is always maintained. The configuration is such that the speed is controlled to a rotation speed corresponding to .

When the normally open relay contact 26a closes, _M1 rotates, and both circular saws 6 and 7 rotate. When the normally open relay contact 27a closes and some of the switches 36 to 39 are closed, the designated speed voltage Vf is set, _M2 rotates forward, and the head portion 5 descends at the designated speed. When the normally open relay contact 28a closes, _M2 is reversed and the head 5 is raised.

Next, normally open relay contacts 26a, 27a, 28a,
A circuit that controls opening and closing of the switches 36 to 39 will be explained.

This circuit is composed of a microcomputer 41 having a CPU, RAM, ROM, input/output ports, clock generator, etc., and has input ports A0 to A.
5 and the open collector outputs Y0 to Y3 of the decoder 42 connected to the output ports A6 and A7 form a matrix, and the signals of each switch and each detector are read. In Figure 3, SW1 is automatic operation switch 2
0, SW2 is the stop switch 21, SW3 is the lowering switch 22, SW4 is the raising switch 23, S1 is the depth of cut limit detector 16, S2 is the opening detector 18, S
3 is the lower limit detector 14, S4 is the upper limit detector 15,
SP0 to SP5 are the contact points of each notch of the speed adjustment switch 24, and depending on the input signal of each notch of SP0 to SP5, the descending speed of the head section 5 can be adjusted in multiple stages from v0 to v5 (v0 to v5) as shown in FIG. <v1<...<v5) is set in advance by the program. P1 to P4 are the contact points of each notch of the return position adjustment switch 25, and depending on the input signal of each notch of P1 to P4,
The return position of the head portion 5 from the lower limit position after the completion of the tenoning process is set in advance in the program in accordance with the machining dimensions of the workpiece 1.

Output port B0 of microcomputer 41
B3 is switch 3 in the series circuit of resistors 31 to 35.
This is an output port for instructing opening/closing of ports 6 to 39, and is designed to close when the output signal is logic "1". The output logic signals of the output ports B0 to B3 are programmed to correspond to a preset descending speed as shown in FIG.
By the combination of and switches 36 to 39, Vf0 to
Generates a speed voltage Vf of Vf5 (Vf0>Vf1>...>Vf5).

Output port B4 of microcomputer 41
B6 is connected to relay coils 26 to 28 via amplifiers 43 to 45, and the output port is set to logic "1".
When , each relay coil 26 to 28 is excited,
Normally open relay contacts 26a-28a close.

Next, the operation of the present invention will be explained. An operator clamps the workpiece 1 in the vice mechanism 2 as shown in FIG. 1, and then operates each switch on the operation panel 19. The microcomputer 41 sets the output ports A7 and A6 to logic "0, 0",
Turn on open collector output Y0 of decoder 42
and SW1 to SW4 from input ports A0 to A3.
The operational status of is read periodically. When the worker operates the automatic operation switch 20 (SW1),
Input port A0 becomes logic "0", this is sensed by microcomputer 41, automatic operation mode is entered, output port B4 is set to logic "1", relay coil 26 is excited via amplifier 43,
Close the normally open relay contact 26a, start _M1 , rotate both circular saws 6 and 7, and after the rotation speed has increased sufficiently, output ports A7 and A6 are set to logic "1, 0" and decoder 42 is opened. Collector output Y2
ON, read which notch the speed adjustment switch 24 is set to from the input ports A0 to A5, set the output port B5 to logic "1", and change the logic as shown in Fig. 4 according to the state of each notch. Output signals to output ports B0 to B3, open and close switches 36 to 39, and change speed voltage Vf to Vf0 to Vf0.
Set one of Vf5 and start _M2 in normal rotation to lower the head part 5 at the specified speed and perform the tenon removal lowering.

While the head section 5 is lowering, the logic "0.1" and "1.0" are repeated for the output ports A7 and A6, the depth of cut limit detector 16 (S1), the opening detector 18 (S2), the lower limit detector 14 (S3), the speed The state of the adjustment switch 24 is read and controlled as shown in the flowchart of FIG.

If the head unit 5 is instructed to stop by the speed adjustment switch 24 while it is descending, the
Since SP0 is closed, input port A0 is logic “0”
The microcomputer 41 senses this, interrupts the automatic operation mode, sets all output ports B0 to B3 to logic "0" as shown in FIG. 4, sets the speed voltage to Vf=Vf0, and outputs the output port B.
5 is set to logic "0", the excitation of the relay coil 27 is stopped, the normally open relay contact 27a is opened, the power to _M2 is cut off, and the lowering of the head section 5 is stopped.

In this state, the manual operation mode is entered, and the output ports A7 and A6 are set to logic "0.0" and the down switch 2 is turned on.
2 (SW3), the operating state of the rise switch 23 (SW4) is read from input ports A2 and A3.

While the input port A2 is at logic "0", the output port B0 is set to the intermediate descending speed v3 shown in FIG.
~Output the logic signal of B3 and set the speed voltage to Vf=Vf
3, outputs logic "1" from output port B5, excites the relay coil 27, closes the normally open relay contact 27a, and starts _M2 in normal rotation.
Lower the head part 5. However, as shown in the flowchart of FIG.
8 (S2), the head section 5 is lowered only when all the lower limit detectors 14 (S3) are in a non-operating state, and while the head section 5 is lowering, if any of these detectors is operated, the output port is B4 and B5 are both set to logic "0", excitation of relay coils 26 and 27 is stopped, normally open relay contacts 26a and 27a are opened, and the power to M ₁ and M ₂ is controlled to be cut off.

While input port A3 is at logic "0", logic "1" is output from output port B6, and relay coil 28
energize M ₂ and close the normally open relay contact 28a.
is started in reverse, and the head section 5 is raised. however,
As shown in the flowchart of FIG. 5, when the head section 5 is raised, only when the aperture detector 18 (S2) and the upper limit detector 15 (S4) are all in the non-operating state.
When the head section 5 is raised, and when the head section 5 is raised, and when the head section 5 is raised, if the upper limit detector 15 (S4) operates, the output port B6
is set to logic "0", the excitation of the relay coil 28 is stopped, the normally open relay contact 28a is opened, the power of _M2 is cut off, and when the opening detector 18 (S2) is activated, the output ports B4 and B6 are opened. Both are set to logic "0", excitation of relay coils 26 and 28 is stopped, normally open relay contacts 26a, 28a are opened, and M ₁ , M ₂
control to cut off the power supply.

In manual movement mode, lower switch 22 (SW
3) Operate the lift switch 23 (SW4) to raise and lower the head part 5 as appropriate, and after aligning the ink line marked on the workpiece 1 with the blade edges of both circular saws 6 and 7, turn the speed adjustment switch 24. If you operate anything other than the stop command,
As mentioned above, the microcomputer 41 detects the operation and returns from the manual operation mode to the automatic operation mode as shown in the flowchart of FIG. Continue the tenoning process for workpiece 1.

When the head section 5 is lowered, the tenoning process is completed, and the lower limit detector 14 is activated, the microcomputer 41 senses this and sets both the output ports B4 and B5 to logic "0" to excite the relay coils 26 and 27. , the normally open relay contacts 26a and 27a are opened, and the power to M ₁ and M ₂ is cut off. Thereafter, a logic "1" is output from the output port B6, the relay coil 28 is energized, the normally open relay contact 28a is closed, and _M2 is activated in reverse. Furthermore, output port A
7. Set A6 to logic "1.1", read which notch the return position adjustment switch 25 is at from the input ports A0 to A3, and raise the head part 5 to the return position specified by the return position adjustment switch 25 in advance. At that point, the logic of output port B6 is set to "0", and the excitation of the relay coil 28 is stopped.
The normally open relay contact 28a is opened to cut off the power to _M2 and stop the head section 5 from rising.

Therefore, it is now possible to easily switch from the automatic operation mode for mortising work to the manual operation mode for marking line alignment work, and back to the automatic operation mode.
You will be able to perform a series of tenon removal tasks smoothly.

[Effect of idea]

According to the present invention, a speed adjustment switch is provided that can set the descending speed of the head section in multiple stages including stop, and when this speed adjustment switch instructs to stop while driving in automatic operation mode, automatic operation mode is set. By interrupting the process and enabling manual operation mode, the head section can be raised and lowered by operating the manual lowering switch and raising switch, making it easier to perform marking line alignment work. In addition, by simply setting the speed adjustment switch to a position other than stop, the machine can return to automatic operation mode and continue mortising.

Furthermore, even in automatic operation mode and manual operation mode, the rotation of electric motors M ₁ and M ₂ is controlled while sensing the operating status of the cut limit detector and opening detector, which improves safety during tenon removal work. can be improved.

As described above, we were able to improve work efficiency by simplifying switch operations and improving safety in mortising work, including marking line matching work.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the schematic configuration of the tenon removing machine according to the present invention, Fig. 2 is a diagram of the operation panel, Fig. 3 is a block circuit diagram, Fig. 4 is a diagram showing the speed adjustment switch and output logic signals, FIG. 5 is a flow chart. In the figure, 5 is the head part, 6 is a vertical circular saw,
7 is a horizontal circular saw, 8 is an electric motor M ₁ , 11 is an electric motor
M ₂ , 12, 13 are bars, 14 is a lower limit detector, 1
5 is an upper limit detector, 16 is a cutting limit detector, 18 is an opening detector, 20 is an automatic operation switch, 22 is a lowering switch, 23 is a raising switch, 24 is a speed adjustment switch, 26 to 28 are relay coils, 26a
~28a is a normally open relay contact, 29 is a triax, 30 is a phase control circuit, 31 to 35 are resistors, 3
6-39 are switches, 40 is a speed detector, 41 is a microcomputer, 42 is a decoder, 43-
45 is an amplifier.

Claims (1)

[Claims for Utility Model Registration] 1. An electric motor guided by a column erected on a base equipped with a vise mechanism for holding workpieces.
In a tenoning machine, the head part is raised and lowered by _M2 , and the head part is equipped with an electric motor _M1 that drives vertical and horizontal double circular saws and a double circular saw, in which the electric motors _M1 and _M2 are linked. The automatic operation switch automatically operates the electric motor _M2 , and the
A manual lift switch that raises and lowers the head section by reversing the rotation speed, a speed adjustment switch that has a stop command that instructs and adjusts the rotation speed of the electric motor M ₂ , and controls the rotation speed of the electric motor M ₂ according to instructions from the speed adjustment switch. Only when the speed adjustment switch is instructed to stop after operating the automatic operation switch,
1. A motor control device for a mortise machine, comprising an arithmetic circuit for controlling forward and reverse rotation of a motor _M2 in order to raise and lower the head section by operating the manual lift switch. 2. When lowering the head using the manual lift switch, there is a lower limit detector that detects the lower limit position of the lifting range of the head, and a cutting limit detector that restricts the range that can be cut by the circular saw at the bottom of the head. The head is lowered at a preset lowering speed only when the opening detectors that detect the opening of the protective cover that prevents exposure of both circular saws are inactive, and these detectors are activated while the head is lowering. 2. The motor control device for a mortise machine according to claim 1, further comprising an arithmetic circuit that controls to cut off power to the motors M ₁ and M ₂ when either of the motors operates. 3. When raising the head using the manual lift switch, the upper limit detector that detects the upper limit position of the lifting range of the head and the opening detector that detects the opening of the protective cover that prevents exposure of both circular saws are all disabled. Raise the head only when in operation,
If the upper limit detector operates while the head section is rising, the power to the motor _M2 is cut off, and if the opening detector operates, the arithmetic circuit controls to cut off the power to the motors _M1 and _M2 . An electric motor control device for a tenon removing machine according to claim 1. 4. The motor control in the tenon removal machine according to claim 1, further comprising an arithmetic circuit for controlling the motor _M1 to return to the automatic operation state when the speed adjustment switch is set to a state other than stop after the head is raised or lowered by the manual lift switch. Device.