JPH0612881Y2 - Cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a cutting device which is mounted on, for example, a construction vehicle and used for cutting an object to be cut such as timber.

(Prior Art) Conventionally, as a cutting device of this type, for example, Japanese Patent Publication No.
The one described in No. 22175 and shown in FIG. 5 is known.

The cutting device 100 basically includes a fixed body 101,
The stationary body 101 includes a chain saw 102 that can be lifted up and down to cut the object A to be cut, and an actuator 103 that raises the chain saw 102 up and down.

Thus, such a thing drives the chain saw to rotate, and cuts the object to be cut by raising and lowering it with an actuator.

However, in such a machine, the feed speed of the chain saw depending on the actuator is always slowed down based on the actual cutting time regardless of whether it is approaching or actual cutting, so the time required for cutting work is extremely long. The difficulty was that it would be long.

(Problems to be solved by the invention) The present invention was devised to solve this problem in view of the above problems, and the purpose thereof is to significantly reduce the time required for cutting work. To provide a cutting device.

(Means for Solving the Problems) A cutting device of the present invention is a fixed body, a chain saw that is provided on the fixed body so as to be able to raise and lower to cut an object to be cut, an actuator that raises and lowers the chain saw, and a chain saw. A tactile bar that can be lifted up and down so that it can contact the object to be cut, a spring that constantly lowers the tactile bar, and a stopper that is provided on the chain saw and that controls the hindrance of the tactile bar to contact the object to be cut before the chain saw. , A detector for detecting that the touch bar contacts the object to be cut and for decelerating the actuator through the speed controller.

(Operation) When cutting an object to be cut, the chain saw is rotationally driven, and the chain saw is lowered by the actuator.

When the chain saw is lowered, the touch bar moves integrally with the chain saw due to the spring and the stopper, and the touch bar comes into contact with the object to be cut before the chain saw.

When the touch bar contacts the object to be cut, the depression of the touch bar is stopped by the object to be cut, and the detector detects this,
The speed controller decelerates the actuator.

When the actuator is decelerated, the yielding speed of the chain saw is decelerated and the stopper disengages from the touch bar.

When the chain saw is decelerated and lowered, the chain saw comes into contact with the object to be cut, and the object to be cut is cut.

When the object to be cut is cut, the chain saw is raised by the actuator.

When the chain saw is erected, the chain saw is released from the object to be cut, and the stopper contacts the touch bar.

When the stopper hits the touch bar, the touch bar moves together with the chain saw, and the touch bar is released from the object to be cut.

When the touch bar is released from the object to be cut, the detector returns and the chain saw and the touch bar return.

When the chain saw and the touch bar return, the rotational drive of the chain saw is stopped.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a rear view showing a cutting device according to an embodiment of the present invention in a raised state. FIG. 2 is a front view showing a horizontal state. FIG. 3 is a side view of FIG. FIG. 4 is a hydraulic circuit diagram.

The cutting device 1 includes a fixed body 2, a chain saw 3, an actuator 4,
The touch bar 5, the spring 6, the stopper 7, and the detector 8 constitute the main part.

The fixed body 2 serves as a base of the cutting device 1.

In this example, it is composed of a side plate 9 spaced apart in the front-rear direction and a bottom plate 10 which is connected to the lower parts of the side plate 9 and is attached at an appropriate place such as a lumbering vehicle.

The chain saw 3 is provided on the fixed body 2 so that the chain saw 3 can be lifted, and can cut the object A to be cut.

In this example, a chain saw body 11 and a sprocket 12 rotatably provided on the chain saw body 11 and separated in the left-right direction,
A saw chain 13 which is hung on these and guided by the chain saw body 11 and can cut the object A, a hydraulic motor 14 which is provided at the base of the chain saw body 11 and rotationally drives one sprocket 12, and a chain saw body. A bracket 15 hung vertically on the base of 11, a support shaft 16 in the front-rear direction for pivotally connecting the bracket 15 to the side plate 9 of the fixed body 2, and a support shaft 16 attached to the base of the chain saw body 11 for loose fitting. It is composed of a mounting plate 17.

As shown in FIG. 4, in the hydraulic motor 14, the P port is connected to the A port of the electromagnetic three-position switching valve, and the T port is connected to the B port of the electromagnetic three-position switching valve via the pilot check valve 18.
The port and the port D are respectively connected to the tank (not shown). The P port and T port of the electromagnetic three-position switching valve are respectively connected to a hydraulic pump and a tank (not shown).

The actuator 4 is for raising the chain saw 3.

In this example, it comprises a bracket 15 of the chain saw 3, a bracket 19 erected on the bottom plate 10 of the fixed body 2, and a hydraulic cylinder 20 interposed therebetween.

As shown in FIG. 4, the hydraulic cylinder 20 has a tail chamber in which an electromagnetic two-position switching valve 21 and a variable check valve-equipped flow rate adjusting valve 22 are arranged in parallel (that is, the hydraulic cylinder 20 depends on them). Configure a speed controller to control the speed of.)
The rod chamber is connected to the A port of the electromagnetic three-position switching valve 23 via the, and the rod chamber is connected to the B port of the electromagnetic three-position switching valve 23. The P port of the electromagnetic three-position switching valve 23 is connected to the T port of the hydraulic motor 14 through the variable check valve-equipped flow rate adjusting valve 24, and the T port is connected to the tank.

The touch bar 5 is provided so as to be elevated in the same direction as the chain saw 3, and can come into contact with the object A to be cut.

In this example, a disc-shaped cam 26 that is attached to the support shaft 16 by a bolt 25 and can be lifted up and down around the support shaft 16 with respect to the fixed body 2 and the chain saw 3, and is partially provided with a notch,
It comprises a projecting plate 27 projecting from this, and a bar 28 extending from this and capable of contacting the object A to be cut.

The spring 6 constantly causes the touch bar 5 to lie down.

In this example, a torsion spring is used, and the winding portion has a mounting plate 17 of the chain saw 3 and a cam 26 of the touch bar 5.
It is loosely fitted to the supporting shaft 16 between the ends, and one end is hooked on the mounting plate 17 of the chain saw 3 and the other end is hooked on the projecting plate 27 of the touch bar 5, respectively, and is urged so that the touch bar 5 is always prone to the chain saw 3. There is.

The stopper 7 is provided on the chain saw 3 to regulate the depression of the touch bar 5 and cut the object A to be cut before the chain saw 3.
To contact with.

In this example, a supporting plate 29 fixed to the mounting plate 17 of the chain saw 3, a bolt 30 screwed to the supporting plate 29 and fitted to the projecting plate 27 of the touch bar 5, and a bolt 30 screwed to the supporting plate 2 to support the supporting plate 2
It consists of a lock nut 31 and a lock nut 31.

Thus, the stopper 7 is arranged so that when the chain saw 3 is in the upright position shown in FIG. 1, the touch bar 5 is in the upright position slightly lower than this.

The detector 8 detects that the touch bar 5 has come into contact with the object A to be cut and decelerates the actuator 4 via the speed controller.

In this example, it comprises a cam 26 of the touch bar 5 and a limit switch 32 fixed to the mounting plate 17 of the chain saw 3.

Thus, the limit switch 32 is opened by inserting the tentacle into the notch of the cam 26 when the touch bar 5 is in contact with the stopper 7, and in other cases, the tentacle contacts the peripheral surface of the cam 26. It is supposed to be closed together.

The limit switch 32 is connected to the electromagnetic two-position switching valve 2
It is connected to the solenoid No. 1 so that the solenoid is demagnetized when it is opened and excited when it is closed.

Next, the operation will be described based on such a configuration.

FIG. 1 shows a case where the chain saw 3 and the touch bar 5 are in the upright position.

In this case, the hydraulic motor 14 of the chain saw 3 is stopped, the hydraulic cylinder 20 of the actuator 4 is shortened, the projecting plate 27 of the touch bar 5 engages the stopper 7 by the spring 6, and the detector 8
The limit switch 32 has a cam 2 of the touch bar 5 with a toucher.
The electromagnetic three-position switching valve (not shown) and the electromagnetic three-position switching valve 23 shown in FIG. 4 are in the neutral position, and the electromagnetic two-position switching valve 21 is in the left position.

When cutting an object A to be cut such as lumber, as shown by the chain line in FIG. 1, this is inserted from the front-rear direction and supported at a predetermined position, and the electromagnetic three-position switching valve (not shown) is set to the forward rotation side position. .

When the electromagnetic three-position switching valve is set to the normal position, pressure oil from the hydraulic pump (not shown) is sent to the electromagnetic three-position switching valve → hydraulic motor 14 → pilot check valve 18 → electromagnetic three-position switching valve → tank. The hydraulic motor 14 rotates in the forward direction.

When the hydraulic motor 14 is rotated, one sprocket 1
The saw chain 13 is rotated via 2.

When the saw chain 13 is rotated, the electromagnetic three-position switching valve 23 shown in FIG. 4 is moved to the left position.

When the electromagnetic three-position switching valve 23 is moved to the left side position, the pressure oil from the hydraulic motor 14 causes the flow control valve 24 with a variable check valve to
The electromagnetic three-position switching valve 23 → the electromagnetic two-position switching valve 21 → is sent to the tail chamber of the hydraulic cylinder 20 and the oil liquid in the rod chamber of the hydraulic cylinder 20 is sent to the electromagnetic three-position switching valve 23 → the tank. 20 is extended. At this time, the pilot check valve 18 also functions as a relief valve for the circuit of the hydraulic cylinder 20 after the variable check valve-equipped flow control valve 24.

When the hydraulic cylinder 20 is extended, the chain saw 3 is lowered.

When the chain saw 3 is lowered, the touch bar 5, the stopper 7, and the detector 8 follow the state shown in FIG.

When the chain saw 3 and the touch bar 5 are lowered, the touch bar 5 first comes into contact with the object A to be cut, and as shown in FIG.
Depression of the touch bar 5 is stopped.

When the touch bar 5 is brought into contact with the object A to be cut, the contact of the limit switch 32 is disengaged from the notch of the cam 26 and is brought into contact with the peripheral surface, so that the limit switch 32 is closed.

When the limit switch 32 is closed, the solenoid of the electromagnetic two-position switching valve 21 shown in FIG. 4 is excited to move it to the right position.

When the electromagnetic two-position switching valve 21 is moved to the right position, the pressure oil from the electromagnetic three-position switching valve 23 is sent to the variable type check valve-equipped flow control valve 22 → the tail chamber of the hydraulic cylinder 20. The extension speed of is reduced.

When the extension speed of the hydraulic cylinder 20 is reduced, the depression speed of the chain saw 3 is reduced.

When the chain saw 3 is decelerated and lowered, the chain saw 3 contacts the object A to be cut, and the object A to be cut is cut as shown in FIG.

When the object A to be cut is cut, the electromagnetic three-position switching valve 23 shown in FIG. 4 is moved to the right position.

When the electromagnetic three-position switching valve 23 is set to the right position, the pressure oil from the hydraulic motor 14 causes the flow control valve 24 with a variable check valve to flow.
-> Electromagnetic three-position switching valve 23-> sent to the rod chamber of the hydraulic cylinder 20, and the oil liquid in the tail chamber of the hydraulic cylinder 20 has a variable check valve with a check valve 22-> electromagnetic three-position switching valve 2
3 → Sent to the tank, the hydraulic cylinder 20 is decelerated and shortened.

When the hydraulic cylinder 20 is decelerated and shortened, the chain saw 3
Is decelerated and raised.

When the chain saw 3 is decelerated and raised, the chain saw 3 is released from the object A to be cut, and the stopper 7 abuts on the touch bar 5.

When the stopper 7 hits the touch bar 5, the touch bar 5
Follows the chain saw 3, and the touch bar 5 is the object A to be cut.
Can be released from.

When the touch bar 5 is released from the object A to be cut, the detector 8 returns to its original position, the electromagnetic two-position switching valve 21 shown in FIG. 4 is returned to the left position, and the deceleration of the hydraulic cylinder 20 is released.

When the deceleration of the hydraulic cylinder 20 is released, the raising speed of the chain saw 3 returns to its original state, and the chain saw 3 and the touch bar 5 return to the original position shown in FIG.

When the chain saw 3 and the touch bar 5 return to their original positions, the electromagnetic three-position switching valve (not shown) is returned to the neutral position and the rotation of the hydraulic motor 14 is stopped.

That is, in the present embodiment, the feed rate of the chain saw 3 is
It is fast when approaching and slow when actually cutting. In addition, the return speed of the chain saw 3 is
It's slowing until it's released, and it's fast after it's released.

Incidentally, the chain saw 3 is the hydraulic motor 1 in the previous embodiment.
However, the present invention is not limited to this, and for example, an electric motor may be used.

Although the hydraulic cylinder 20 is used as the actuator 4 in the above embodiment, the actuator 4 is not limited to this, and may be, for example, a hydraulic motor, an electric motor, or an electric cylinder.

In the previous embodiment, the touch bar 5 is provided so that it can be elevated around the support shaft 16, but the present invention is not limited to this. For example, the touch bar 5 may be provided at the base of the chain saw body 11 so that it can be raised by a shaft other than the support shaft 16.

Although the spring 6 is provided between the chain saw 3 and the touch bar 5 in the above embodiment, the spring 6 is not limited to this, and may be provided between the fixed body 2 and the touch bar 5, for example.

Although the limit switch 32 is used as the detector 8 in the above-described embodiment, the detector 8 is not limited to this and may be an optical sensor, for example.

Although the detector 8 controls the actuator 4 to shift both the feed speed and the return speed of the chain saw 3 in two stages in the previous embodiment, the detector 8 is not limited to this, and only the feed speed of the chain saw 3 is shifted in two stages. The actuator 4 may be controlled to do so. in this case,
The returning speed of the chain saw 3 is preferably constant and high.

(Effect of the Invention) As described above, according to the present invention, the following excellent effects can be achieved.

(1) It consists of a fixed body, a chain saw, an actuator, a touch bar, a spring, a stopper, and a detector.The chain saw feed speed is set to be high during approach and slow during actual cutting, so the time required for cutting work is reduced. It can be greatly shortened.

(2) Since the touch bar, spring, stopper, and detector are provided, the feed rate of the chain saw can be automatically controlled according to the diameter of the cut object.

[Brief description of drawings]

FIG. 1 is a rear view showing a cutting device according to an embodiment of the present invention in a raised state. FIG. 2 is a front view showing a horizontal state. FIG. 3 is a side view of FIG. FIG. 4 is a hydraulic circuit diagram. FIG. 5 is a view similar to FIG. 1 showing a cutting start state. FIG. 6 is a view similar to FIG. 1 showing a cutting end state. FIG. 7 is a front view showing a conventional cutting device. 1 ... Cutting device 2 ... Fixed body 3 ... Chain saw 4 ... Actuator 5 ... Touch bar 6 ... Spring 7 ... Stopper 8 ... Detector

Claims (1)

[Scope of utility model registration request] 1. A fixed body, a chain saw that can be lifted up and down on the fixed body to cut an object to be cut, an actuator that lifts up the chain saw, and an object that can be lifted up in the same direction as the chain saw. Touch bar, a spring that constantly bends the touch bar, a stopper that is provided on the chainsaw to regulate the depression of the touch bar to contact the cut object before the chain saw, and that the touch bar touches the cut object. A cutting device comprising a detector for detecting and decelerating an actuator through a speed controller.