JPS6273902A - Motor controller in tenoning-machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electric motor control device during overload during cutting of a workpiece in a tenon removing machine having an automatic lifting and lowering function.

[Background of the invention]

/ In a conventional mortise machine with an automatic lifting function, a clutch that utilizes spring compression is installed in the power transmission mechanism between the electric motor M2 for lifting and lowering the head and the screw shaft, and overload is applied while the head is lowering. At this time, the transmission of the movement M2 is cut off so that the load of the constant line M2 is not applied to the main body, and the operation of the clutch is detected and the power to the electric motor k is cut off, and the electric motor k is started to rotate in reverse for a short time. The head was raised and evacuated.

(1
(1) When the cut wood of the workpiece gets under the head and the descending movement is restricted; (B) When the workpiece is hardwood or has large knots; If the speed is too high, the motor may become stuck, and then the lowering motion may become stuck. However, in the conventional method,
Although the restraint fA4 can be canceled only in the case α) mentioned above, (B
), after the electric horizontal ground is in the restraint state 9, a load of more than a certain M2 is applied to the main body, the clutch is activated, and the operation of the clutch is detected and the power to the electric motor and pigeon is cut off. When the workpiece is small or the clamping force of the vise mechanism is weak, the workpiece is moved clockwise (in the direction of arrow A) using the vise mechanism as a fulcrum in Fig. 1. is rotated. Alternatively, if the clamping force of the vice mechanism is strong enough, the entire vice mechanism clamping the workpiece is pushed back in the left direction K (direction of arrow B) in FIG. As a result, excessive force is applied to the vertical and horizontal circular saws, causing problems such as chipping of the cutting edge of the circular saw, deformation of the circular saw itself, and deformation of the head parts that support the circular saw. was there.

Also, when both circular saw drive systems become stuck, the electric motor Ml,
Since the m source of M2 is shut off and the tenoning process is stopped at S in the middle, in order to perform the single-tenon process again, hold the workpiece in the vise mechanism again, and remove the electric motor.
There was a problem in that it was necessary to start the ground, which significantly reduced the effectiveness of the tenon removal work.

Even in conventional mortising machines, a cut limit detector for limiting the cut range of the workpiece is provided below the head. However, when a piece of wood is cut during f-groove removal work, especially during concealment work, the piece of wood is cut off before the head reaches the lower limit [fK, goes under the head, and is detected by the cut limit detector.

At this point, the mikagushi work has been completed,
Judging to be in an abnormal state, the power was cut off to the electric motor M1 and pigeon 1, and the electric motor M2 was started to rotate in reverse for a short period of time, and the head part was raised and retracted. Therefore, an operation to raise the head portion was required, resulting in poor workability.

[Purpose of the invention]

The present invention has been made in view of the above, and its purpose is to: α) detect an overload condition that may be applied to the main body during mortising work, and control the rotational drive of the electric machine M2. This is to prevent deformation and damage to the main body.

(B) The purpose is to detect an overloaded condition and automatically control the rotational speed of the 11-ton mower M2, thereby improving the lost time in the tenon removal work.

[Summary of the invention]

The present invention has the following features: (J) When an overload is applied to the main body in relation to the descending movement of the head part during tenoning work, the head part stops descending and is retracted upward; (2) Rotation of the circular saw If an overload is applied to the main body during operation, after stopping the lowering of the head, move the head up and retreat, reduce the descending speed, and start the cutting operation again. Detectors (A,) and (B) that detect overload applied to the lowering drive system and overload applied to the circular saw drive system, respectively.
, electric motors M2 and M2 are each equipped with a drive circuit, a speed adjustment switch for instructing and controlling the rotational speed of the electric motor, and a phase control device. The electrical relationship with the arithmetic circuit for automatically controlling the drive circuit of the electric motors Ml and Ml has been devised, and furthermore, if a cut piece of wood is detected by the cutting limit detector during the concealing work, Specified head return position a
The electrical connections have been devised so that it can be evacuated up to .

[Embodiments of the invention]

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

In Fig. 1, the workpiece 26'? Clamping chair mechanism part 1
The head section 4, which is guided by a column 3 that stands upright from a base 2, is equipped with a pair of vertical saws 5, a wide saw 6, and an electric motor 7 (hereinafter abbreviated as "self") that drives both circular saws. .,
), a drive transmission mechanism (not shown) is provided. One or two screw shafts 8 are installed on the base 2 so as to be parallel to the column 3, and screwed together so that the head portion 4 can be moved up and down. The upper ends of the column 3 and the screw shaft 8 are supported by the bridge part 9, and the screw @8 is connected to an electric motor 10 (hereinafter abbreviated as a cabinet) disposed in the bridge part 9 via a drive transmission mechanism (not shown). connected. Therefore, by rotationally driving the force, the head M4 can be moved up and down. The lower limit position of the vertical movement range of the head section 4 is determined by the lower limit detector B provided on the head section 4 with a bar 1 provided on the base 2, and the upper limit position is determined using the upper limit sensor B provided on the bridge section 9 with the bar 12 provided on the head section 4. This is detected by a detector l.

The operation panel 15 shown in FIG. 2 includes an operation switch 8 for instructing to start and stop the M2, a floating switch 1,
A rising switch that instructs the head section 4 to move up and down by applying force, a descending switch that instructs the head section 4 to move up and down, a speed adjustment switch that can instruct the descending speed of the head section 4 in multiple stages, and a A return position ft adjustment switch 21 is provided which can adjust the upward return position tiyfr in advance in multiple stages.

In the case of general tenoning work, operate operation switch b on operation panel b, first start Ml, rotate both circular saws, vertical saw 5 and horizontal saw 6, and then The head section 4 is lowered at the speed specified by the speed adjustment switch, and the workpiece 26 held in the vise mechanism section 1 is cut into a predetermined tenon size. When the lower limit detector n installed on the descending head part 4 detects the bar n placed on the top 2, the pigeon stops its rotation, and after a preset time T2 has elapsed, the pigeon's rotation is completely reversed. and raise the head part 4. The rise of the head part 4 is
From the position where the bar ■ leaves the lower limit detector I3, it rises to the return position f specified by the return position adjustment switch 21, or the bar P disposed on the head part 4 rises to the position detected by the upper limit detector M and stops. let

However, during the tenoning process, the following abnormal overload is assumed to occur on the descending head portion 4.

■ When the workpiece 26 is clamped into the vise mechanism l, or when the opening/closing dimensions and core movement dimensions of the circular saw 5.6 are incorrectly set for the mortising dimension of the workpiece 3, the vice mechanism Part l
When the workpiece 26 that is being held between the head parts 4 is caught between the workpieces 26.

(Example) When a piece of l-horizontal wood generated during the tenoning process is not removed and remains, and gets caught between the head part 4 and the base 2 during the next trecessing process, and the descending movement is restricted.

G) If the workpiece material 3 is hardwood or has large knots, or if the setting of the speed hook adjustment switch that instructs the descending speed is incorrect and tenon processing is performed, the double circular saw 5.6 The driving Ml is in a restrained state, and the workpiece 26 is subjected to rotational force or return force in the direction of arrow A or B as shown in FIG.
If the cutting edge of the double-sided circular saw 5.6 is chipped, the saw blade is deformed, or if M2, which drives the head section downward, becomes restricted.

In order to prevent the M2 overload state from occurring, it is necessary to detect each overload state, control the M1% problem, and release the restraint state before a restraint order or book is reached. In the case of α) mentioned above, the cutting limit detector 5 is disposed under the head section 4, and the opening/closing dimensions of each pair of circular saws 5.6 are determined with respect to the workpiece. , when the positional relationship of core movement is inappropriate,
Alternatively, when an attempt is made to process a length exceeding a preset maximum tenon length, the depth of cut limit detector 6 detects the workpiece 3 while the head section 4 is descending, and the descending movement of the head section 4 is stopped. Then, raise and evacuate. In the case of (2), an encoder 24 having a plurality of slits at appropriate positions in a single screw shaft 8 and a power transmission mechanism (not shown) in the elevating and lowering movement system of the head part 4 is used.
A detector 49 is provided to detect the presence or absence of the slit portion of the encoder 24, and the pulse width of the pulse signal output from the detector 49 is measured, and when the pulse width exceeds a preset pulse interval, a restraint state is established. After predicting that this will happen, the lowering operation of the head section 4 is stopped and the head section 4 is moved upwardly. In the case of (3),
As in the case of 39 saws, 1 young type Ml, both circular saws 5.
6, and an encoder blade having a plurality of slits is disposed at a suitable position in the power transmission groove (not shown), and a detector blade for detecting the presence or absence of the slits in each encoder is disposed, and the output from the detector is disposed. The pulse width of the pulse signal is measured, and when the pulse width exceeds a preset pulse width, it is predicted that a restraining order will be reached, and M1 and M2 are stopped, and the control is reversed to raise and retreat the head section 4. . In the case of (3), if the circular saw electric system is predicted to be in a locked state and the operation of the main body is stopped, the mortise process will be interrupted and the work efficiency will be reduced, so the locked state After canceling the operation, the Ml and the corridor should be activated again, the descending speed of the head section 4 should be automatically adjusted as appropriate, and the tenoning process should be continued to improve the working young wood.

The operation of the present invention will be explained below using the block circuit diagram shown in FIG.

In Fig. 3, a normally open relay contact 27α is connected in series between the power line and M1, and a normally open relay follower 28- is connected in series between the power line and M2 so that forward and reverse rotation is possible. 129α
, and the triac blade, and the phase control circuit blade is connected between the power supply lines through a normally open relay contact 28-.
-I am. The phase control circuit 32 connects the power supply line to the L and N terminals.
A DC power supply VC,42 is generated internally, and a resistor 3 is connected between this ￥c):N.
9 to 47, and the opening/closing states of switches 44 to 47, a speed voltage Tll corresponding to the rotational speed 9 of seven specified in advance in multiple stages, that is, the descending speed of the head section 4 is generated, and the rotational speed of M2 is detected by the speed detector. The frequency signal detected in step 31 is converted to DC 4 kings V& by a frequency/voltage converter (not shown), and the magnitudes of Vf and Va are compared, and when Vf) Va, the conduction angle of the triac is increased. (When Va, the conduction angle of the triac (9) is controlled to be small, and the speed is controlled so that the rotation speed always corresponds to the speed voltage vfK.Here, the normally open relay contact 27-
When closed, the nut rotates, and both circular saws 5.6 rotate. When the normally open relay contact 28α closes and some of the switches 44 to 47 are closed, the specified speed voltage Vf is generated, and ■
rotates in the normal direction, and the head portion 4 descends at the indicated speed. Also, when the normally open relay contact 29α is closed, the pigeon is reversed and the head portion 4
rises.

Next, the normally open relay 274.28-. 29111, a circuit that controls opening and closing of switches 44 to 47 will be explained.

This circuit consists of a microcomputer with a CPU, RAM, ROM, human output board, clock generator, etc.
A matrix is formed by the oven collector output Yo%Y1%1, Y3 of the decoder connected to A7 and A7, and the signals of each switch and each detector are read. 5WIFi operation switch B, sw2 is stop switch 1, SW3 is up switch, sw4 is down switch υ, f31 is cutting limit detector section, S3 is upper limit detector 14.54Fi, lower limit detection 5I3, SPo -, -SPs are the contact points of each notch of the speed adjustment switch, and according to the output signal of each notch of SPo to SPs, the descending speed of the head section 4 can be adjusted in multiple stages as shown in FIG. , Postal cpo<τ
'1<υ=inside <v4<inside)' is set in advance by the program. - P4 are the contact points of each notch of the return position adjustment switch 21, and the lower limit I of the head portion 4 is adjusted after the tenon processing is completed according to the output signal of each notch of Px - P4.
Adjust the return position of f:〃≧ to the machining dimensions of the workpiece 26, and press H! as shown in FIG. , H2, m, Ila C
&<H2<&<~) is set in advance in the program. The chest of the micro combinator 3, the human-powered boat a, includes an encoder field for detecting the rotation of the drive system of both circular saws 5.6, a detector part for detecting the presence or absence of a slit part of the encoder field, and a head part 4. An encoder dam for detecting the vertical movement of the elevator and a detector 49 for detecting the presence or absence of a slit portion of the encoder are connected to the encoder. The output signals of these detection units 4 and 4 are periodic signals according to the rotational speed of both circular saws 5 and 6 and the lifting and lowering of the head unit 4, and the pulse width of this signal is measured by a microcomputer. As a result, overload states of both circular saws 5.6 and the lifting drive system can be detected simultaneously. Therefore, when these pulse widths exceed the preset pulse width, it can be determined that some kind of overload has been applied to the roaring drive system, and the ground and the front can be controlled as described above. .

The CO to Q+ output ports of each micro combinator are ports for instructing the switches 44 to 47 in the series-parallel circuit of resistors 39 to 8 to open or close, and are closed when the output signal is logic rlJ. The logic signal of the output port of Co % Cs is programmed to correspond to a preset descending speed as shown in FIG. ,? In order to correspond to 3, 4, and 5, resistor 39~resistance core and switch 40~
V7o, V7x, Vf2 depending on the combination of switch 47
, Vfs, Vf4, Vfs (Vlo) Vfx)
Vf2:)'03) V74) V75) (7
) speed K IIE pressure V/ is generated.

The output port of the -r microcomputer - Yuono) is connected to the relay coil miller through the amplification secret word -a, and the buzzer n
When the output boat is @rirlJ, each relay coil 27-29 is energized, and the normally open relay contacts 27c&,
28α and 294 are energized. Also, a buzzer n is energized to issue an alarm when necessary.

Next, the operation of the present invention will be explained.

As shown in FIG. 1, the operator holds the workpiece in the vise mechanism IK, and then operates each switch on the operation panel 15. The microcombinator is output boat A.
7. Turn on the logic rO, OJi/, turn on the decoder oven collector output YO, and input capo-)AJ)~
The operation status of SW1 to SW3 is constantly read from the phantom.

The worker presses the lower switch 19 (5W4) for blackout.
When turned on, the human powered boat A3 becomes logic "0", and this logic rOJ"k is sensed by the microphone combinator.
After setting the output port Du to logic "1" and exciting the relay coil 3 via the amplifier 36 and closing the normally open relay point 28a, the output port C2 is set to logic "1" and the switch 46 is closed, and the speed voltage Vf = Vf3, the triac field is triggered by the phase-side circuit blade, Mz is started to rotate forward (1-), and the head portion 4 is lowered at a descending speed of (3). When the head section 4 is lowered and the vertical saw 5 approaches the workpiece, turn off the lowering switch 19 (8w4), the human-powered boat A3 becomes m-embedded rlJ, and this logic rlJ is recognized by the micro combiator. and output boats C2, Dl
Return to logic "0" and stop excitation of the relay coil,
The normally open relay contact 28α is opened, the power to the force fi is cut off, and the lowering of the head portion 4 is stopped.

In addition, when raising the head section 4, press the raising switch E (
When E3W3) is turned ON, the input port becomes ``0'', this logic ``1'' is sensed by the micro combinator, the output port becomes logic RLJ, and the relay coil is excited via amplifier a. Then, the normally open relay contact 29- is closed, the pigeon is started to rotate in reverse, and the head portion 4 is raised. When the ascending switch B (EIW3) is turned OFF, the human power boat & becomes logic RLJ, which is detected by the micro combination valve, sets the output boat to logic "0", stops excitation of the relay coil, and opens normally. Open relay contact 29, M
z The source 41 is shut off to stop the head section 4 from rising.

Next, when performing tenon processing, operate the operation switch L (5WI).
) is turned on, the input boat signal becomes logic "0" and is sensed by the micro combinator blade, and when the period of this logic "0" exceeds the preset time T (0.3 to O95 seconds). , Execute the tenon removal process and output
Let the logic rlJ be, and through the amplification secret word, the relay coil n
is energized, the normally open relay contact 274 is closed, Ml is started to rotate, both circular saws 5.6 are rotated, and after the set delay time T1 has elapsed, the output capo (A7) and As are set to logic "1," O
”, turn on the decoder output Y2, and input the input port ao to indicate which notch the speed adjustment switch is applied to.
DI is set to the logic rlJ, and the output logic signal is output from the output port Go-wc! according to the state of each notch, as shown in FIG. Enter a,
Switches 44 to 47 are opened and closed to set the speed voltage Vf to Vfo.
, Vfs c7) Set to either A, start the forward rotation of the screw, lower the 2 dot 4 at the specified speed, and perform mortise machining. It is assumed that a state is applied to the main body, and the circuit operation in each case will be explained using FIG.

In the case of α) above, while the head unit 4 is descending, the output boat AT of the micro combinator field is set to logic “0,
IJK, turn on the Yl output of the decoder U, and periodically read the logic state of the manual boat input that inputs the operation signal of the depth of cut limit detector 25 (81), and if the logic rOJ
When detected, output boat Co -y Ox immediately
), Dl is logic rOJ K and relay coil n
, 28 and normally open relay contacts 27a, 28a.
is opened, the power to Ml and Mz is cut off, and after a preset delay time T2, the output boat is set to logic rlJ, the relay coiler is energized, the normally open relay contact 29- is closed, and the pigeon is started to rotate in reverse. The head section 4 is raised and retracted. This upward retraction is set in the program to the return position instructed by the return position adjustment switch or until the upper limit detector M (133) is activated.

In the case of (2) above, while the head section 4 is descending, the pulse signal output from the detector 49 is input to the input port B1 of the microcombi controller, and the # of this pulse signal is input.
Read the period of ``0'' and ``1'' at regular intervals,
When the read logical condition does not change more than the preset number of readings N1, it is determined that some kind of overload has occurred in the lowering operation of the head unit 4, and the output boat is immediately turned off.
-, -Ox and ), Di as logic rOJ, the same control as in the case of / above is performed, and the program is set to raise and retreat only the raising operation for a preset time Ts. .

3. In the case of (3) above, the head part 4 is lowered and the pulse signal output from the detector mallet is sent to the micro combinator while the workpiece is being tenoned with the circular saw 5.6. Input this pulse signal to the logic "0"
, monitor the period of "l" at regular intervals, and when the read ethical state does not change more than the preset number of reads N2, it is determined that some kind of overload has occurred in the double circular saw 5.6, and the machine immediately , output capo) C (1~Cs and), D
l is set to logic "0", excitation of relay coils 27 and 28 is stopped, normally open relay contacts 27G and 28a are opened, and M1
, M2's power is cut off, and after a preset delay time T2,
The relay coil 29' is energized as logic "1" for the preset time Ts of the output boat, and the normally open relay contact 29
4 is closed, the refrigerator is started to rotate in reverse, and the head portion 4 is slightly raised and retracted. If the operation of the main body is stopped in this state, the tenon removal process will be interrupted, and the efficiency of the work will be greatly reduced. Therefore, in order to perform the tenon removal process again,
output port), suddenly logic rlJ K energizes relay coil 27.28, normally open relay contact 274.28c
L is closed, and the speed instructed by the speed adjustment switch side is increased or the instructed speed is decreased by one step, and the output port C! A logic signal is output from e-Ox and the switch 44
-47 is opened i'1, both circular saws 5.6 are rotated, and the head portion 4 is lowered again to continue the process of increasing the tenon.

If an overload occurs again in the same way as the tenon removal process continues, the above-mentioned operation is repeated.

Also, when the indicated speed was 93, an overload occurred on both circular saws 5.6 and 5.6 while an overload was detected and the descending speed was slowed down one step at a time and the descending speed of ν3 was being used for several seconds of tenon processing. In this case, the logic of the pulse signal output from the detection 4 north is rOJ, r
The period of lJ is read at fixed time intervals, and the read logic state is determined by the preset number of readings Ns (Ns (N2
) When there is no change, change the descending speed to zol and so! To set the value 1) *s, - in the middle of , output capo) Co-C3
Change the logical state of the switch as shown in Figure 4, and
Change the opening/closing status of C and continue the tenoning process.
are doing.

As described in points 1 to 3 above, it is possible to predict the restraint state while detecting the unique overload state in the mortise remover and control the assembly and tenon machine as appropriate.

Furthermore, in the case of the above-mentioned/and
l. After completing the pigeon control operation, set the output boat to logic rlJ several times intermittently, operate the buzzer n via the amplifier side, and issue an alarm to notify that an overload condition has occurred in the main unit. That's what I do.

While the workpiece 3 is being tenoned, that is, when the head section 4 is descending, the microconveter is turned on.
The logic state of the input port A3, which inputs the operation signal of the lower limit detector 1; When detected by the device (B4), the output of the output capo (Co-03) and the formula
0'', the excitation of the relay coils 27 and 28 is stopped, and the normally open relay contact 27a.

Open 28eL and cut off the power supply to Ml and corridor. Then, after a preset delay time T2 has elapsed, the output boat is set to logic "1", the relay coil is energized, the normally open relay contact 294 is closed, Ml is started to rotate in reverse, and the head section 4
to rise.

The head part 4 starts to rise, and the bar n reaches the lower limit detector n (B
4), that is, the logic rOJ of the output port
After the micro combinator ring detects that K has been reversed by "1" from When the return position data (H! ~ &) is counted as 1, it is judged that the specified return position has been reached, the output boat is set to logic "0", the excitation of the relay coil device is stopped, and the normally open relay contact is 29a opens, blocking 'ti* to the corridor. Thereafter, after a preset delay time T3 has elapsed, the output port C! is set to logic "1", and the output port C! A logic signal is output so that o-Os has a descending speed fs, the relay coil 3 and switches 44 to 47 are opened and closed, and Mz is started to rotate forward for a preset time T4, which is caused by the inertia of the head section 4. Reduce and stop the rising motion.

Incidentally, in the tenoning work, there is a unique work called shading work, and as shown in FIG. 6, the first time is processed like (-), and the second time is machined like VC(t).

The cut piece of wood C by this hiding operation crawls under the descending head portion 4 and is detected by the cut limit detector 5 before the head portion 4 reaches the lower limit position. However, when the wood piece C is cut, the hiding work is completed, so when the wood piece C is detected by the cut limit detector 5, the return position f is the same as when the lower limit detector 13 is activated. The rotation and stop of the yoke are controlled so that the yoke is raised to the return position instructed by the adjustment switch 21 ic and then stopped.

FIG. 5 shows the program data set in the ROMK of the micro combinator blade regarding the control of the present invention.
Memory addresses N and N+6 are the output data of the output capo (co) to C3, which is the descending speed data, and N+7 to N+9 are the pulse width of the output pulse signal of the detector 49, which detects the overload state of the ground. Data used when measuring %
N+10-N+17 is set with data used when counting the upward return distance of the head section 4 after the tenon processing.

FIG. 7 is a flowchart showing the operation of the present invention during the tenon removal work.

In the figure, 70-
The chart shows 391J of A, B, and O.

The figure shows a case in which a person starts M1 at a commanded speed using a speed adjustment switch.

B shows the case where M2 is started by decreasing the commanded speed 1t of the speed adjustment switch one step at a time.

0 is the indicated speed S and 2 when the indicated speed on the speed adjustment switch is 93, or when the speed is decreased and the speed is υ
The case is shown in which the rotational speed of the calm is switched to a speed of 2.5 in the middle of .

〔Effect of the invention〕

According to the present invention, in order to detect an overload condition that may occur during mortise processing in a tenon cutter having an automatic lifting function, a cut limit detector is provided on the lower side of the head, and a lowering drive system of the head is provided. An overload detector for the lower drive system and an overload detector for the circular saw drive system are installed, and the output signals of each detector are read.If an overload condition occurs during mortising, the electric motor for lowering drive and the circular saw drive system are installed. Since the errand motion is appropriately controlled to prevent the machine from becoming bound, deformation and damage to the main body can be prevented, and safe tenon removal work can be performed.

In addition, if the circular saw drive system becomes overloaded,
It has a mechanism that can adjust the descending speed of the head section in multiple stages, and after an overload condition occurs, it automatically controls the rotation of iC, M8, and Ms, and reduces its own speed without interrupting the tenon removal work. Since the machine can be controlled and the tenon removal work can be restarted, the reduction in work vehicle movement can be significantly improved.

Furthermore, even when the cut limit detector detects a piece of wood caused by the shading work that is unique to mortising work, the machine moves up to the normal return position and stops in the same way as when the lower limit detector operates. Therefore, the setup time for the next tenoning work can be reduced.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the general structure of the tenon removal machine according to the present invention, Fig. 2 is a diagram of the operation panel, Fig. 3 is a block circuit diagram of the present invention, and Fig. 4 is a descending speed, FIG. 5 is a diagram showing program data, FIG. 6 is an explanatory diagram of the concealing operation, and FIG. 7 is a flowchart. In the figure, 4 is a head part, 5 is a vertical saw, 6 is a horizontal saw, 7
#i electric motor, 10 is electric motor power, 11, ν is bar, I3
is the upper limit detector, M! −j lower limit detector, b is operation panel,
] 6 is the operation switch, 18 is the up switch, I9 is the down switch, Mi is the speed adjustment switch, 21 is the return position adjustment switch, 22 is the buzzer, Ta, Sae is the encoder, instrument is the cutting limit detector, part is Work material, I~grave is relay coil,
274-29α are normally open relay contacts, Shu is a triac,
31 is a speed detector, the blade is a phase control circuit, 33 is a micro combinator, 34 is a decoder, 38 is an amplifier, 3
9 to 0 are resistors, 躬 to 47 are switches, and a 49Fi detector. Patent Applicant Name Hitachi Koki Co., Ltd. Haramachi Yone 1 Prisoner 13m No. 4 Shishi No. 5 No. 6 Tree (CL)

Claims (1)

[Scope of Claims] 1. The head part is raised and lowered by a reversible electric motor M_2 guided by a column installed upright on a base equipped with a vise mechanism for clamping the workpiece, and the head part has vertical and horizontal movement. In a tenoning machine equipped with both circular saws and an electric motor M_1 that drives both circular saws, there are an upper limit detector and a lower limit detector that detect the upper and lower limit positions of the vertical range of the head, and two The circular saw is equipped with a cutting limit detector that limits the cutting range, a detector (A) that detects an overload state of the drive system that drives the head up and down, and a drive system that drives both circular saws. a detector (B) for detecting an overload state of the electric motor M_1, an operation switch for instructing to start and stop the electric motors M_1 and M_2, a speed adjustment switch for instructing and adjusting the rotation speed of the electric motor M_2, and a rotation speed of the electric motor M_2. A phase control device for controlling the speed and a return position adjustment switch for instructing and adjusting the ascending return position of the head after tenon processing are provided, and the output signal of each of the detectors and the output signal of each switch is provided. An electric control device having an arithmetic circuit for automatically adjusting the rotation speed of electric motor M_2, starting and stopping electric motors M_1 and M_2, and automatically adjusting the rotation speed of electric motor M_2. 2. When the workpiece contacts the depth of cut limit detector while the head is lowering, an alarm will be issued if the power to the motors M_1 and M_2 is cut off, and then the motor M_2 is started in reverse and the head is raised and retracted. 2. The electric motor control device according to claim 1, further comprising an arithmetic circuit for controlling the motor as follows. 3. During the tenoning process, when an overload condition occurs in the head lifting drive system, the overload condition is determined based on the output signal of the detector (A), and after cutting off the power to the electric motors M_1 and M_2. 2. The motor control device according to claim 1, further comprising an arithmetic circuit for controlling the motor M_2 to start in reverse and issue an alarm when the head part is raised and retracted. 4. During the tenoning process, when an overload condition occurs in both circular saw drive systems, the overload condition is determined based on the output signal of the detector (B), and after cutting off the power to motors M_1 and M_2. , After starting the electric motor M_2 in reverse and raising and retracting the head part, the electric motor M_1 is started again, and the rotational speed of the electric motor M_2 is started at the same speed or at a reduced speed, and control is performed so that the tenon removal process can be resumed. The electric motor control device according to claim 1, comprising an arithmetic circuit. 5. During tenoning work, especially when a thinly cut piece of wood is detected by the cut limit detector as in the case of shading work, control is performed to raise and retreat to the return position indicated by the return position adjustment switch. The electric motor control device according to claim 1, comprising an arithmetic circuit. 6. A detector that magnetically and optically detects the rotational speed of the rotating member of each drive system and converts it into an electrical signal as a means for detecting an overload state of the circular saw drive system and the head lifting drive system. Detectors (A) and (B) that detect the presence or absence of a slit and convert it into an electrical signal by attaching an encoder having a plurality of slits to the body (A) and (B) or a rotating member.
An electric motor control device according to claim 1, claim 3, or claim 4, comprising: 7. As a method for detecting the overload state of both the circular saw drive systems and the head lifting/lowering drive system, electric motor M_1 and electric motor M_
The motor control according to claim 1, 3, or 4, further comprising a detector (A) or (B) that converts the load current of 2 into a voltage magnetically or by connecting a resistor. Device. 8. Claims comprising an arithmetic circuit that receives the output signal of the detector (A) for detecting an overload state of the head lifting drive system as set forth in claim 6 and counts the lifting distance of the head. The motor control circuit according to items 1 and 5. 9. The reference value for the overload state of the drive system of both circular saws as set forth in claim 4 is set in advance in a plurality of stages, and the overload state is detected only at a specific speed instructed by the speed adjustment switch. The reference value for judgment is reduced, the overload condition is judged based on the output signal of the detector (B), and the electric motors M_1, M_
2. The motor control device according to claim 1, further comprising an arithmetic circuit for controlling the rotational speed of motor M_2 to reduce the load on motor M_1 without cutting off the power supply to motor M_2.