JPH0753928Y2 - Lifting equipment for wood processing machines - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention facilitates the automatic raising / lowering operation of the cutting head.
In addition, the present invention relates to a wood processing machine that can easily perform black line marking on wood.

[Conventional technology]

Taking a conventional automatic lifting type tenon remover as an example, the cutting head lowering push button switch 35 and the raising head push button switch 36 arranged on the bridge 4 are operated as shown in FIG. Using the control circuit of the lifting motor 9 shown, the speed control is performed only when the cutting head 7 is lowered, and when the cutting head 7 is raised, the speed control is not performed and the entire voltage is applied. That is, when the cutting head 7 is lifted, the lift motor 9 is used at the rated output, or is used in a slightly overload region because the lifting operation time is short, 2 to 4 seconds.

[Problems to be solved by the device]

Therefore, by operating the push button switch 35, the relay coil 37 is energized to close the normally open relay contact 37a ₁ ~37a _3,
The phase control circuit 25 is activated to activate the bidirectional switching element 20.
Was triggered, electric power was supplied to the lifting motor 9, and there was a time delay until the rotation started, and the response was not very good.

Therefore, before the mortise removing work or the like, a work for aligning the vertical saw blade 5 and the horizontal saw blade 6 with a black line which is a cutting line described on the upper surface of the wood to be processed (hereinafter referred to as black line aligning work). Hold the handle provided on the cutting head by hand,
In the case of a manual lifting type tenon remover that manually pushes down the cutting head, temporarily stop the circular saw near the wood and gradually move the cutting head closer to the upper surface of the wood from here,
Push button switch 35 for automatic lifting and lowering machines
Even if the cutting head was operated in small steps, the cutting head 7 did not descend as desired, or sometimes it fell too much, so that black line alignment work could not be performed properly.

Further, when the cutting head 7 is raised, the push button switch 36 is operated to excite the relay coil 38, the normally open relay contacts 38a ₁ and 38a ₂ are closed, and the full voltage is applied to the lifting motor 9. There is a problem that the noise and vibration are large, and further, when an AC commutator motor is used as the lifting motor 9, the commutation brush is heavily worn and its life is short.

The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks, simplify the conventional automatic lifting device, and adjust the speed of the cutting head so that it can be easily adjusted to the black line attached to the wood, and further manual lifting (EN) Provided is a wood processing machine which can be operated in the same manner as a conventional tenon-removing machine and which reduces noise when the cutting head is raised and lowered.

[Means for Solving the Problems]

The present invention is a wood processing machine in which a guide bar is hung vertically on a base, a cutting head is fitted to the guide bar, and the cutting head is raised and lowered by a lifting motor. The toggle lever part of the double throw toggle type up / down switch is operably provided, and the toggle type up / down switch is electrically connected so that the rotation direction of the up / down motor can be directly switched, and bidirectional switching is performed in series with the up / down motor. When the cutting head is lowered, the variable resistor can be adjusted in advance in the low speed range by connecting the element, and when the cutting head is raised, the variable resistor is short-circuited by the toggle type up / down switch to achieve a preset high speed. It has a control circuit, and when switching the rotation direction of the lifting motor by operating the toggle type lifting switch, the contact on the main circuit side of the lifting motor was closed. And it is characterized in that the toggle lifting switch having a contact is closed structure of the control circuit side.

[Action]

The present invention operates a toggle type up / down switch by vertically swinging the operation lever, directly switches the rotation direction of the up / down motor, regulates the contact circuit order of the up / down switch, operates the phase control circuit, and operates the bidirectionality. The switching element is controlled so that it can be adjusted in the low speed range when descending, and the high speed when ascending.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a mortise picking machine showing an embodiment of the present invention, and FIG.
Fig. 3 is a cross-sectional view of the lifting mechanism, Fig. 3 is a layout of operating levers and lifting switches, Fig. 4 is a layout of lifting switches and contacts,
FIG. 5 is a circuit diagram. In this embodiment, a mortise picking machine will be described as an example of the wood processing machine.

In the figure, a vise device 2 for holding wood is provided at one end on a base 1, and a guide bar 3 is vertically provided at the other end.
The bridge 4 holds the upper end of the guide bar 3. A cutting head 7 having a vertical saw blade 5 and a horizontal saw blade 6 which are orthogonal to each other is fitted to the guide bar 3 so as to be vertically movable with the guide bar 3 as a guide. A coil spring 8 is mounted on the outer circumference of the guide bar 3 between the lower surface of the cutting head 7 and the upper surface of the base 1,
It receives the load of the cutting head 7. As shown in FIG. 2, the lifting mechanism of the cutting head 7 has a gear nut 11 incorporated into a lifting motor 9 attached to the cutting head 7 via a counter gear 10. The gear nut 11 is a lifting screw 12 fixed to the bridge 4 and a screw. The structure is such that the cutting head 7 is moved up and down by being fitted and driven by the up-and-down motor 9.

The elevating switch 13 is a multi-pole double-throw toggle type switch as shown in FIGS. 4 (a) and 4 (b). The elevating switch 13 is arranged in the bridge 4 and the toggle lever portion 13a of the elevating switch 13 is used.
3 is engaged with a small hole provided in an operation lever 15 having a rotation fulcrum 14 near the side surface of the bridge 4, and the elevating switch 13 operates according to the vertical swing of the operation lever 15. It is like this. In addition, the operation lever 15 is a tension spring.
It is normally held in a neutral state (horizontal direction in FIG. 3) by 16.

Next, the electrical operation will be described with reference to FIG.
In the figure, the main circuit for lowering is connected in series with an AC power supply 17 to a lower limit switch 18, a ₁ contact of the lifting switch 13, a rotor winding of the lifting motor 9, a ₂ contacts of the lifting switch 13, and a lifting motor 9. The stator winding and the bidirectional switching element 20 are connected.

The main circuit for raising is the AC power supply 17 connected in series with the upper limit switch 19, a ₃ contact point of the raising / lowering switch 13, and the raising / lowering motor 9
The rotor winding and the a ₄ contact of the lift switch are connected in the same way as the main circuit when descending. Here, although the lower limit switch 18 and the upper limit switch 19 are not shown in detail, the limit which operates when the lower limit position of the ascending / descending range of the cutting head 7 is reached or the upper limit position is reached. Any switch will do. The contacts a _{1 to} a ₄ of the lifting switch 13 shown in FIG. 5 are arranged as shown in FIG.

Next, phase control of the bidirectional switching element 20 will be described. The diode 21, the resistor 23 and the capacitor 24 form a smoothing circuit by half-wave rectification when the a ₁ contact of the elevating switch 13 is closed at the time of lowering, and the diode 22, the resistor 23 and the capacitor 24 of the elevating switch 13 at the time of ascending. a When the ₃ contacts are closed, a smoothing circuit is formed.

The DC power generated by this smoothing circuit is supplied to the phase control circuit 25. The resistors 26, 27 and 28 and the variable resistor 29 are connected in series with an appropriate stabilizing power source Vc in the circuit to form a voltage dividing circuit and generate an output voltage V ₁ . By adjusting the variable resistor 29, the descending speed of the cutting head 7 can be changed within a preset low speed range (for example, 1 to 6 m / min).

The rising fourth diagram using a ₅ contacts the lifting switch 13 shown in (b), both ends are short-circuited resistor 27 and variable resistor 29, speed of ascent is preset (e.g., 12m / min) I'm trying to come back. The speed voltage generator 31 is a gear nut shown in FIG.
11 is arranged in the vicinity of the tip of the tooth, receives the signal of the detector 30 that magnetically detects the passage of the tooth tip and outputs a signal, and replaces it with the speed voltage V ₂ according to the ascending / descending speed. It is composed of an F / V conversion circuit that generates a voltage in proportion to the frequency.

The arithmetic circuit 32 inputs the output voltage V ₁ of the voltage divider circuit to its non-inverting input terminal, and inputs the speed voltage generator to its inverting input terminal.
Input 31 output voltage V ₂ and compare the magnitude of both voltages,
When V ₁ > V ₂ , increase speed because it is too slow for the set speed.
When V ₁ <V ₂ , the trigger circuit 33 in the next stage is controlled to decelerate because it is too fast for the set speed. The trigger circuit 33 detects the timing of the zero voltage of the power source through the resistor 34 from the AC power source, adjusts the trigger phase angle of the bidirectional switching element 20 according to the instruction of the arithmetic circuit 32, and cuts at the specified speed. The head 7 is raised and lowered.

As described above, when the operation lever 15 is pushed down, the contacts a ₁ and a _{2 of} the lift switch 13 are closed, the trigger phase angle of the bidirectional switching element 20 is adjusted, and the power supplied to the lift motor 9 is adjusted. Then, the variable resistor 29 is operated so as to reach the speed instructed. Return the control lever 15 or
When the cutting head 7 reaches the lower limit, the main circuit is cut off and the descent is stopped.

Here, considering the case where the operation lever 15 is pushed down slowly, either the contact a ₁ or the contact a ₂ of the elevating switch 13 is closed first. If the contact a ₁ closes _first , the phase control circuit
Although 25 is in the operating state, the lift motor 9 does not rotate because the contact a ₂ is open, and the phase control circuit 25 determines that it is in the locked state, and the contact a ₂ is closed with a delay. Immediately after that, the trigger phase angle of the bidirectional switch element 20 may be advanced to instantaneously cause full-voltage operation. In order to prevent such a dangerous operation, the angle of the internal movable contact is slightly changed so that the contact a _{1 of} the lift switch 13 is closed after the contact a ₂ of the lift switch 13 is closed.

Similarly, when the operating lever 15 is pushed up,
As the internal movable contact structure in which the contact a _{4 of} 13 is closed and then the contact a ₃ is closed, the cutting head 7 rises at a speed according to the divided voltage determined by the resistors 26 and 28. Also in this case, when the operation lever 15 is returned or the cutting head 7 reaches the upper limit, the main circuit is disconnected and the ascending stops.

In the present invention, the constant speed control is performed even while the cutting head 7 is moving up. The reason for this is that the conventional operation is performed by applying the rated voltage of the lifting motor 9 or a rated voltage in a slightly overload region during the rising. Therefore, the vibration and noise at the time of ascending are large, and since the AC commutator motor is used for the lifting motor 9, there are problems such as large commutation sparks and short brush life. For this reason, a motor having a surplus power is used to suppress the ascending speed for operation.

However, in order to prevent the lifting motor 9 from increasing in size,
As described above, the load of the cutting head 7 is received by the coil spring 8. By mounting the coil spring 8, the amount of inertial movement when the cutting head 7 descends decreases, and
Since the load of the lifting motor 9 is reduced by the coil spring 8 when the lifting motor 9 is lifted, the lifting motor 9 can be comfortably lifted even if it is small.

[Effect of device]

According to the present invention, the contact of the toggle type up / down switch short-circuits a part of the resistance that regulates the speed, so that it is possible to adjust in a low speed range when the cutting head descends, and it becomes a high speed when the cutting head rises. Even if the operating lever is operated in small steps, the followability of the cutting head's descending, responsiveness, and responsiveness of ascent can be greatly improved, and black line alignment work can be done easily with the feeling of manual lifting. became.

In addition, the toggle type up / down switch is operated by vertically swinging the operating lever, and the rotation direction of the up / down motor is directly changed.
In addition, since the order in which the contacts of the lifting switch are closed is regulated, the phase control circuit can be operated properly and the bidirectional switching element can be controlled to safely rotate the lifting motor.

Furthermore, since the load of the cutting head is received by the coil spring, the inertial movement becomes small when the cutting head descends,
Since the load on the lifting motor is reduced when it is raised, the lifting motor can be made smaller, and noise and vibration during lifting can be reduced, which reduces the power required for movement, thus significantly extending the life of the rectifying brush. it can.

[Brief description of drawings]

FIG. 1 is a side view of a tenon-removing machine showing an embodiment of the present invention, FIG. 2 is a sectional view of an elevating mechanism part, FIG. 3 is a layout of operating levers and elevating switches, and FIG. 4 is elevating switches and contacts. Fig. 5 is a layout diagram, Fig. 5 is a circuit diagram, Fig. 6 is a side view of a conventional tenon-removing machine, and Fig. 7 is a conventional circuit diagram. In the figure, 1 is a base, 3 is a guide bar, 7 is a cutting head, 8 is a coil spring, 9 is a lifting motor, 13 is a lifting switch, 13a is a toggle lever part, 15 is an operating lever, 20 is a bidirectional switching element, 21,22 are diodes, 23,26〜
28 and 34 are resistors, 24 are capacitors, 25 is a phase control circuit, 29
Is a variable resistor, 30 is a detector, 31 is a speed voltage generator, 32 is an arithmetic circuit, and 33 is a trigger circuit.

Claims (2)

[Scope of utility model registration request] 1. A wood processing machine in which a guide bar is hung vertically on a base, a cutting head is fitted to the guide bar, and a cutting motor is moved up and down by an elevating motor. The toggle lever of the double-throw toggle-type up / down switch is operably provided, and the toggle-type up / down switch is electrically connected so that the rotation direction of the up / down motor can be directly switched, and bidirectional in series with the up / down motor. A switching element is connected, and when the cutting head is lowered, it can be adjusted in advance in a low speed range by a variable resistor, and when the cutting head is raised, the variable resistor is short-circuited by the toggle type elevating switch to set a preset high speed. When switching the rotation direction of the lift motor by operating the toggle type lift switch, the contact on the main circuit side of the lift motor is closed. After, the lifting device in the wood processing machine, characterized in that the toggle lifting switch having a contact is closed structure of the control circuit side. 2. The lifting device for a wood processing machine according to claim 1, wherein a compression spring is provided between the base and the cutting head to reduce the load on the lifting motor when the cutting head is raised.