JPH0246966Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an automatic lifting and tenoning machine that raises and lowers a cutting head using the power of an lifting motor.

[Background of the idea]

The prior art will be explained with reference to the saw-type automatic handle cutting machine of 1984-4644 and the automatic handle cutting machine of 14974 of the Japanese public utility industry.
In the former, a feed screw is fixed to the cutting head and is screwed into an elevating motor provided on the bridge to raise and lower the cutting head. In this case, if the feed screw is rotatably supported by the bridge and screwed into the cutting head, the feed screw will penetrate into the machining range and protrude above the bridge, making long tenon machining impossible. For this reason, when the cutting head rises, the feed screw protrudes to about twice the height of the machine body, causing problems such as problems in the work area and deformation due to external force when protruding. In the latter case, a gear motor disposed on the bridge and a cutting head are transmitted through a chain and moved up and down. The lifting mechanism of the present invention has problems such as when the lifting mechanism is moved up and down at high speed or when the feed rate is changed during lowering, the chain does not follow the movement and the transmission loss is large.

In addition, because conventional automatic machines have a constant feed rate,
Work efficiency is poor when working with lightly loaded materials, and cutting may become impossible when working with heavily loaded materials.
There was a request to make the descending speed adjustable. In addition, since the descending speed conversion is performed by controlling the rotational speed of the lifting motor, in the case of low-speed feeding, the amateur cooling fan could not cool the motor, which caused the problem of burning out the motor.

[Purpose of invention]

The purpose of this invention is to eliminate the drawbacks of the conventional method, improve the transmission efficiency of the lifting mechanism, create a structure with good follow-up performance for speed conversion, and expand the range of use according to the differences in workpiece materials and sharpness of the blade. That's true.

[Summary of the idea]

The present invention uses a screw with good transmission efficiency in the cutting head feeding mechanism, and the feed screw is placed as close to the guide bar as possible to reduce transmission loss, thereby reducing loads such as cutting reaction force. In order to stabilize the cutting head when going up and down, there are two feed screws.
Since they are connected by a chain and the left and right feed screws rotate synchronously, a tensioner is used to prevent the chain from sagging.

Furthermore, a single-phase series-wound commutator motor is used as the lift motor, and speed control is performed by controlling the phase with a bidirectional semiconductor switch.

Note that when speed control is performed, the rotational speed becomes slow in the case of low-speed feeding, and the motor's own cooling fan loses its cooling function, so a separately powered cooling fan was provided on the commutator side.

[Example of idea]

An embodiment of the present invention will be explained with reference to FIGS. 1 and 2.

Vise device 2 that fixes the material to be cut on the base 1
, and two guide bars 3 are vertically provided at the other end. A cutting head 16 having vertical and horizontal circular saws 4 and 5 is fitted into the guide bar 3, and its upper end is held by a bridge 6. Cutting head 16
There are two feed screws 7 arranged in parallel on the guide bar 3.
are screwed together, and both ends are pivotally supported on the base 1 and the bridge 6. The left and right feed screws 7 are interlocked by a chain 8, and a tensioner (not shown) is provided in the center to measure the synchronous rotation of both feed screws 7. Further, a bevel gear A9 is fixed to the upper end of either side of the feed screw 7, and is fitted with a bevel gear B10 fixed to the spindle shaft of the elevating motor 12 disposed on the bridge 6 to transmit power.

The height of the cutting head 16 on the left and right sides varies depending on the screwing position of the feed screw 7, and it is necessary to provide an adjusting female screw 11 on at least one of the heads and make it rotatable.

The rotational speed of the lifting motor 12 is controlled by a speed control circuit, and the lowering speed can be changed by operating the speed adjustment switch 13. Further, an air blowing type cooling fan 14 is disposed on the commutator side at the rear of the lifting motor 12, and rotates to blow air when the operation switch 15 is turned on.

The operation of the present invention will be explained using the block circuit diagram shown in FIG. A driving switch 15 is connected in series to the power supply line, and a cooling fan 14 and a lifting motor 12 are connected to the output terminal of the driving switch 15.
are connected. The lifting motor 12 has normally open relay contacts 17a, 18a and a bidirectional semiconductor switch 1.
9, it is connected to allow forward and reverse rotation. When the normally open relay contact 17a is closed and the bidirectional semiconductor switch 19 is triggered from the phase control circuit described below,
The lifting motor 12 rotates forward, and the bevel gear B10,
The cutting head 16 is lowered via the bevel gear A9, the chain 8, and the feed screw 7.

When the normally open relay contact 18a is closed, the lifting motor 12 is reversely rotated, and the cutting head 16 is raised via the bevel gear B10, the bevel gear A9, the chain 8, and the feed screw 7.

The phase control circuit 21 inputs the power line to the L and N terminals via the normally open relay contact 17a, generates a DC power supply Vc internally, and connects a resistor 22 and a speed adjustment switch 13 ( In this case, a variable resistor is used) is connected to the lifting motor 1.
2, that is, a speed voltage Vf corresponding to the lowering speed of the cutting head 16 is generated. The rotation speed of the lifting motor 12 is detected by the speed detector 20, and the signal is converted into a DC voltage by a frequency/voltage converter (not shown).
Convert it to Va, compare the speed voltage Vf and Va, and if Vf>Va, the bidirectional semiconductor switch 19
The conduction angle of the bidirectional semiconductor switch 19 is controlled to be large, and when Vf<Va, the conduction angle of the bidirectional semiconductor switch 19 is controlled to be small, so that the speed is controlled so that the rotation speed always corresponds to the speed voltage Vf.

If you close the normally open relay contact 17a and operate the speed adjustment switch 13 to adjust the speed voltage Vf,
The lowering speed of the cutting head 16 can be adjusted by rotating the lifting motor 12 at a speed corresponding to the set speed voltage Vf.

The cutting head 16 can be lowered or raised by replacing the normally open relay contacts 17a and 18a with a control circuit (not shown) for instructing lowering or raising, or a lowering switch or a lowering switch, and opening and closing them as appropriate. .

[Effect of idea]

According to the present invention, both ends of the feed screw are pivotally supported by the base and the bridge, and are arranged side by side near the guide bar, resulting in high mechanical reliability and good transmission efficiency.
In addition, by controlling the rotational speed of the lifting motor, an appropriate feed speed can be selected depending on the type of workpiece and the size of the wood, improving work efficiency.

Furthermore, by installing a cooling fan, it is possible to feed at low speeds, making it possible to cut heavily loaded workpieces, making it possible to use it in workplaces with poor power supply, and allowing the blade to be used for a longer period of time. The scope of use is expanded and economic effects are achieved.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a side view, and FIG. 3 is a block circuit diagram. In the figure, 1 is the base, 2 is the vice device, 3
is a guide bar, 4 is a vertical circular saw, 5 is a horizontal circular saw, 6 is a bridge, 7 is a feed screw, 8 is a chain, 9 is a bevel gear A, 10 is a bevel gear B, 11 is an adjustment female screw, 12 is a lifting motor, 1
3 is a speed adjustment switch, 14 is a cooling fan, 15
is the operation switch, 16 is the cutting head, 17a, 1
8a is a normally open relay contact, 19 is a bidirectional semiconductor switch, 20 is a speed detector, and 21 is a phase control circuit.

Claims (1)

[Claims for Utility Model Registration] 1. A vertical cutting machine using a base having a vise device for fixing a material to be cut, a pair of guide bars vertically installed on the base, and a bridge connecting the upper part of the guide bars as guides. In a tenoning machine in which a cutting head having a saw and a circular saw for horizontal cutting is raised and lowered by a lifting motor, the lifting motor is disposed on either the base or the bridge, and is connected to the lifting motor by a power transmission means. An automatic lifting/lowering tenon machine, characterized in that a feed screw is rotatably supported at both ends by a base and a bridge, and is threadedly engaged with the cutting head, and the cutting head is moved up and down by rotation of the feed screw. 2 A plurality of the feed screws are arranged in parallel to the guide bar, and each feed screw is rotated synchronously by a power transmission means such as a chain. The automatic lifting and tenoning machine described in item 1. 3 a bidirectional semiconductor switch connected in series with the lifting motor when the cutting head is lowered;
a speed detection means for detecting the rotational speed of the lifting motor and generating a speed voltage corresponding to the rotational speed;
and a phase control circuit that compares a voltage corresponding to a desired speed of the lifting motor with the speed voltage from the speed detection means and generates a signal that reduces the conduction angle of the bidirectional semiconductor switch when the speed voltage is large. An automatic lifting and tenoning machine according to claim 1 of the utility model registration claim, characterized in that: 4 Utility model registration claim 1 characterized by the provision of a cooling fan for cooling the lifting motor
Automatic lifting and tenoning machine as described in section.