JPH04112002A - Elevation mechanism in tenoning machine - Google Patents

Abstract

PURPOSE:To easily regulate the lowering velocity of a cutting head by actuating a toggle type elevation switch by swinging operation of an elevation lever and changing over the rotation direction of an elevation motor and actuating the variable by the turning operation of the elevation lever and regulating velocity. CONSTITUTION:When an elevation lever 16 is pushed down and turned, the contacts a1, a2, a5 of an elevation switch 13 are closed. Electric power supplied to an elevation motor 9 is adjusted by regulating a trigger phase angle of a bidirectional switching element 26 so as to become the velocity of output voltage V1 of a voltage division circuit which is varied in accordance with the turning angle of the elevation lever 16, namely in accordance with the resistance value of a variable resistor 20. When the turning angle of the elevation lever 16 is regulated, a cutting head 7 is lowered at an arbitrary low velocity. When the elevation lever 16 is pulled up, the contacts a3, a4, a6 of the elevation switch 13 are closed. Electric power supplied to the elevation motor 9 is adjusted by regulating the trigger phase angle of the bidirectional switching element 26 so as to become the velocity of output voltage V2 of the voltage division circuit. The cutting head 7 is raised at the set high velocity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an elevating mechanism in a mortise machine in which a lifting lever is used to raise and lower a cutting head.

[Background of the invention]

In the conventional automatic stripping machine, as shown in FIG. 6, a toggle-type lifting lever 16, which is disposed on the side of the bridge 4 and held neutrally by a tension spring 17, is swung up and down. Operate the lift switch 13 to directly change the rotation direction of the lift motor.

As shown in FIG. 7, a variable resistor 20 placed in front of the bridge 4 is adjusted, and a bidirectional switching element is used to supply power to the lifting motor according to the resistance value of the variable resistor 20. That is, the lowering speed of the cutting head can be adjusted within a preset speed range by adjusting the speed by phase control.

However, since the operating position of the variable resistor 20 and the lowering lever 16 are separated, the variable resistor 20 must be adjusted when aligning the vertical saw blade and the horizontal saw blade with the ink line marked on the workpiece. The machining speed of the cutting head was slowed down, and the ink lines were aligned by small steps of the elevator lever 16. Furthermore, after operating the variable resistor 20 to set a descending speed suitable for the workpiece, the elevator lever 16 is pressed down to perform actual cutting. However, since it is troublesome to appropriately adjust the descending speed each time, the operator usually performs the ink line alignment and cutting work while adjusting the variable resistor 20 so that the descending speed is on the high speed side of the variable range.

Therefore, the descending speed relative to the workpiece is too fast, causing problems such as locking during cutting and poor partitioning of the cutting surface.

Therefore, in response to the unique cutting load fluctuations in chiseling work, that is, at the start of cutting, the cutting load is only on the vertical saw blade, the load gradually increases, and when cutting starts with the horizontal saw blade, the load is even higher. The load increases until it reaches a maximum, and then the load gradually decreases to finish cutting. There has been a desire for a system that can efficiently and easily adjust the descending speed in response to such unique load fluctuations.

[Purpose of the invention]

The purpose of the present invention is to eliminate the drawbacks of conventional lifting devices, facilitate the alignment of ink lines marked on wood, and easily adjust the descending speed of the cutting head during mortising. be.

[Summary of the invention]

The present invention focuses on the fact that by engaging a toggle-type lift switch and a variable resistor with a lift lever, it is possible to perform lifting and lowering operations and increase/decrease the lifting speed with a single lever, and the holding structure of the lift lever has been devised. The toggle type lift switch is operated by the swinging operation of the lift lever, the rotational direction of the lift motor is changed, and the variable resistance is operated by the rotational operation of the lift lever.

The electrical connections were devised so that the speed could be adjusted.

[Embodiments of the invention]

Embodiments of the present invention will be described using FIGS. 1 to 5.

In the figure, a vice device 2 for clamping a workpiece is provided at one end of a base 1, a column 3 is erected at the other end, and the upper end is held by a bridge 4. A cutting head 7 having a vertical saw blade 5 and a horizontal saw blade 6 is fitted into the column 3 so as to be movable up and down. A coil spring 8 is attached to the guide bar 3,
It is adapted to receive the load of the cutting head 7. As shown in FIG. 2, the lifting mechanism has a gear nut 11 built into the cutting head 7 that is driven by a lifting motor 9 via a counter gear 10, and a lifting screw 12 fixed to the bridge 4.
The cutting head 7 is threadedly fitted and the cutting head 7 is raised and lowered by the rotation of the raising and lowering motor 9.

A toggle type switch is used as the lift switch 13, which is disposed inside the bridge 4, and a holding member 1 having a rotating shaft 14 near the side of the bridge 4 as shown in Figure 3.
The lift switch 13 is operated by engaging the small hole provided in the lift switch 5 with the toggle lever part of the lift switch 13, and in response to the vertical swing of the lift lever 16 whose outer circumference is supported by the holding member 15. It looks like this. The holding member 15 is always held in a neutral position (horizontal position in FIG. 3) by a tension spring 17, and the lifting lever 16
is also kept horizontal. As shown in FIGS. 3 and 4, the lift lever 16 is always under tension by a tension spring 18 supported at a proper position on the bridge 4, so as to generate an appropriate rotational reaction force. The rotation range of the lift lever 16 is regulated by a notch 21 provided at the end of the lift lever 16 and a locking pin 22 protruding from the holding member 15.

In addition, in FIG. 3, a gear part is formed on the left outer circumference of the lift lever 16, and a gear 1 that engages with this gear part is formed.
9 is a variable resistance! ! It is fixed to the shaft of 20. By rotating the lift lever 16, the variable resistor 20
The resistance value can be changed.

Next, the electrical operation will be explained using FIG. 5. In the figure, the main circuit for lowering is connected in series to the AC power supply 23, including a lower limit switch 24, a contact a of the lift switch 13, a rotor winding of the lift motor 9, a contact a2 of the lift switch 13, and a lower limit switch 24, a contact a of the lift switch 13, a rotor winding of the lift motor 9, and a contact a2 of the lift switch 13. The stator winding of the lifting motor 9 and the bidirectional switching element 26 are connected. In addition, the main circuit at the time of rising is the upper limit switch 2 in series with the alternating current 23.
5. Contact a2 of the lift switch 13. The number of turns of the rotor of the lifting motor 9 and the contact a4 of the lifting switch 13 are connected in the same way as the main circuit during lowering. Although the detailed installation of the lower limit switch 24 and the upper limit switch 25 mentioned above is not shown in the drawings, they operate when the lower limit position of the lifting range of the cutting head 7 is reached or when the upper limit position is reached. A limit switch that does this is fine.

Next, phase control of the bidirectional switching element 26 will be explained. Diode 27, resistor 29, capacitor 30
When the contact a□ of the lift switch 13 closes when descending,
A smoothing circuit is formed by half-wave rectification, and the diode 27, resistor 29, and capacitor 30 form a smoothing circuit when the contact a of the lift switch 13 is closed during rising. The DC power generated by this smoothing circuit is supplied to the phase control circuit 31.

When descending, the variable resistor 20 and the resistor 32 are connected in series with a suitable stabilized power supply Vc in the circuit to form a voltage divider circuit, and the arithmetic circuit 37 An output voltage V□ is generated at the non-inverting input terminal of.

As described above, by pressing down the lift lever 16 and rotating the grip part, the variable resistor 2 is
Since the 0 shaft rotates, the resistance value changes in proportion to the rotation angle, and the descending speed of the cutting head 7 can be adjusted within a preset low speed range (for example, 0 to 6 m/min).

During the rise, the resistor 33 and the resistor 34 are connected in series with the stabilized power supply Vc to form a voltage divider circuit, and the output voltage is supplied to the non-inverting input terminal of the arithmetic circuit 37 via the contact a6 of the lift switch 13, which is closed during the rise. Generate v2. By pulling up the lift lever 16 as described above, the preset high speed (
For example, it is designed to rise at a rate of 12 m/min). The speed voltage generator 36 is disposed near the tips of the teeth of the gear nut 11 shown in FIG. It converts into a corresponding speed voltage V, and is composed of an F-V conversion circuit etc. that generates a voltage in proportion to the frequency.

The arithmetic circuit 37 inputs to its non-inverting input terminal the output voltage ■1 of the positive divider circuit at the time of falling (V at the time of rising), and inputs the output voltage V, V, from the speed voltage generator 36 to its inverting input terminal.
Input , compare the magnitude of both voltages, and if V When rising, v z
< v z ), the speed is too fast for the set speed, so the trigger circuit 38 at the next stage is controlled to reduce the speed.

The trigger circuit 38 is connected to the AC power supply 23 via a resistor 39.
While detecting the zero voltage timing of the power supply, the trigger phase angle of the bidirectional switching element 26 is adjusted according to instructions from the arithmetic circuit 37, so that the cutting head 7 moves up and down at a specified speed. , lift lever 1
6 is pressed down and rotated, contact a of the lift switch 13
The bidirectional switching element is configured so that a2, a is closed and the speed is determined by the output voltage V□ of the voltage divider circuit, which changes according to the rotation angle of the lifting lever 16, that is, the resistance value of the variable resistor 20. The power supplied to the lifting motor 9 is adjusted by adjusting the trigger phase angle 26. By adjusting the rotation angle of the lifting lever 16, the lifting lever 16 can be lowered in a desired low speed range, the turning operation of the lifting lever 16 can be returned, the lifting lever 16 can be returned to the horizontal position, or the cutting head 7 can be adjusted. When the lower limit is reached, the main circuit is cut off and the descent stops.

Next, when the lift lever 16 is pulled up, the lift switch 1
3 contacts a, a, aG are closed and the trigger phase angle of the bidirectional switching element 26 is adjusted so that the speed specified by the output voltage v2 of the voltage dividing circuit is reached, and the voltage is supplied to the lifting motor 9. Adjust the amount of power used. As a result, the cutting head 7
rises at a preset high speed, and when the lifting lever 16 is returned or the cutting head 7 reaches its upper limit, the main circuit is cut off and the rising stops.

In the present invention, the toggle type lift switch 13 is operable by vertical swinging of the lift lever 16 to directly switch the rotation direction of the lift motor 9. In this case, when the lift motor 9 has a small capacity, If the capacity of the lift motor 9 is large, it is necessary to switch the rotation direction of the lift motor 9 by using an electromagnetic contactor suitable for the capacity. Although the speed can be adjusted by the rotation operation of 16, it is possible to easily adjust the speed not only when descending but also when ascending, if necessary.

〔Effect of the invention〕

According to the present invention, the lift lever is made swingable and rotatable, and the toggle type lift switch is actuated by the vertical swing operation of the lift lever, and the rotation direction of the lift motor is directly switched. We installed a variable resistor whose resistance value changes in conjunction with the rotation angle, and when descending, it can be adjusted within a preset low speed range, and when ascending, it operates at high speed. , By vertically swinging and rotating the lift lever, the lifting direction and speed of the cutting head can be adjusted at will.The turning angle of the lift lever is reduced during the above-mentioned black line alignment work, and when cutting Adjust the rotation angle of the lift lever according to the load fluctuations peculiar to tenon removal to adjust the lowering speed arbitrarily and easily! ! J adjustment is now possible, and the cutting head can now be quickly retracted upwards after cutting.

Therefore, it has become possible to provide a mortise removal machine that can efficiently perform a series of mortise removal operations.

[Brief explanation of the drawing]

Figure 1 is a side view of the tenon removal machine, Figure 2 is a sectional view of the lifting mechanism, Figure 3 is a new view of the area around the lifting lever, Figure 4 is a sectional view taken along line A-A in Figure 3, and Figure 4 is a cross-sectional view of the lifting mechanism. FIG. 5 is a circuit diagram, FIG. 6 is a sectional view of the area around the elevator lever of the prior art, and FIG. 7 is an enlarged explanatory diagram of the area around the elevator lever of the prior art. In the figure, 13 is a lift switch, 14 is a rotation shaft, 1
5 is a holding member, 16 is a lift lever, 1718 is a tension spring, 19 is a gear, 20 is a variable resistor, 21 is a notch, 22
26 is a locking pin, 26 is a bidirectional switching element, 27.
28 is a diode, 29.32 to 34.39 are resistors, 3
0 is a capacitor, 31 is a phase control circuit, 35 is a detector,
36 is a speed voltage generator, 37 is an arithmetic circuit, 38 is a trigger circuit, and 6 is a contact point. 4'7J (No change in content) Figure 1 Figure 2 Name of patent applicant Hitachi Koki Haramachi Co., Ltd. Figure 3A Figure 4 Figure 6 Figure 7 Figure 5

Claims (1)

[Claims] 1. A column is erected on a base, a bridge is provided at the upper end, a cutting head having a vertical saw blade and a horizontal saw blade is provided on the column so as to be movable up and down, and the cutting head can be moved up and down. In a tenon removing machine that is raised and lowered by a motor, an elevator lever that can be vertically swung is provided at an appropriate position on a bridge, and the elevator lever is rotatable about the longitudinal direction of the lever, and the elevator lever is pivoted. Accordingly, a toggle lever portion of a toggle type lift switch is operable, the toggle type switch directly switches the rotational direction of the lift motor, and a bidirectional switching element is connected in series with the lift motor. On the other hand, a variable resistance value is provided that changes the resistance value depending on the rotation angle of the lifting lever, and when the cutting head is lowered, it can be adjusted arbitrarily within a preset low speed range, and when the cutting head is raised, the lifting lever is swung upward. A lifting mechanism for a mortise machine, comprising a control circuit that controls the phase of the bidirectional switching element to achieve a preset high speed. 2. Corresponding to the speed when the cutting head descends and rises,
Claim characterized in that the voltage dividing circuit is provided with a voltage dividing circuit that emits a preset instruction voltage, and the voltage dividing circuit is switched by the opening/closing contact of the toggle type lift switch, and the variable resistor is included in the voltage dividing circuit. 1. A lifting mechanism in the tenon removing machine according to item 1.