JPS5826082Y2 - wood cutting machine - Google Patents

Description

[Detailed description of the invention] Conventionally, it has been known to run a rotating saw on the top of a table to cut objects larger than the diameter of the saw, but the device is bulky and requires a large amount of power. In addition, the saw diameter becomes large, which increases the cost.In addition, when the saw diameter becomes large, saw runout occurs and the cut surface becomes rough, making it impossible to obtain a clean cut surface.

The present applicant previously filed Japanese Patent Application No. 53-14615 in order to eliminate the conventional drawbacks such as sloping, and developed a wood cutting machine that can effectively cut long pieces of wood even with a small saw diameter. proposed.

In this invention, a circular saw is rotatably supported at the tip of an arm of a certain length, and the circular saw is arranged vertically upward.
The arm is made to swing in a fan-shaped fixed angle range, and a slit larger than the diameter of the saw is bored in the top surface of the table, and when the arm swings, the circular saw blade is exposed from between the slits to the top surface of the table. During this time, the pressing bar moves up and down to clamp the wood on the top surface of the table.

The present invention proposes an improved mechanism for raising and lowering the suppression bar in such a wood cutting machine, and an example of the implementation of the present invention will be described below with reference to the drawings.

1 is a case, and the inside is a chamber A by a partition wall 2.

It is divided into two parts of B.

Here, chamber A houses the circular saw 3, and chamber B houses the circular saw 3.
An arm 4 is housed therein to allow the body to swing within a certain angular range.

Here, the arm 4 is rotatably supported by a support shaft 6 of a bearing 5, and in the illustrated example, in order to make it more compact, the arm 4 is swung by the drive of a motor 7 provided on the ceiling wall.

That is, the input shaft pulley ii of the reducer 100 is rotated via the belt 9 from the pulley 8 of the motor γ, and the crank 13 of the output shaft 12 is slowly rotated at a reduced speed, thereby rotating the rod 14. Let's make it run back and forth.

Here, the other end of the rod 14 is rotatably attached to the arm 4 using a pin 15, and the arm 4 is swung within a certain angle range during the reciprocating movement.

At this time, the wood is cut during the forward stroke of the arm 4, but in order to reduce the load applied at this time, an auxiliary force is applied to the arm 4 by a spring 16. One end is fixed on the bottom surface of the case, and the other end is attached with a chain 17, which meshes with a sprocket 18 that is integrally attached to the support shaft 6. The other end is attached to the arm 4. It is fixed to the upper bracket 19.

Reference numeral 20 denotes a protrusion provided on the lower end edge of the arm at a position that does not interfere with the operation of the rod 14,
The protrusion is adapted to engage with a lever described later.

Reference numeral 21 denotes a suppression bar having a U-shaped cross section, and a guide rod 2 which is set on the upper surface of the table 22 of the machine base.
It moves up and down in a horizontal state using 3 a and 23 b as guides.

Reference numeral 24 denotes an elevating frame for this purpose, whose upper end is rotatably fixed to the press bar 21 using a pin 25, and whose lower end is inserted into the chamber BK in front of a lever rod 26, which will be described below. It is rotatably fixed using one end and a pin 2γ.

Thus, the lever rod 26 is formed in an F-shape and is swingably attached to a bracket 28 provided on the partition wall 2 with a pin 29 as a pivot, and the F-shape front piece a is attached to the center part. The position of the rear piece is connected to a spring 30 provided at the bottom of the machine so that it is always pulled downward, and the upper surface of the rear piece is formed to a certain length so that the protrusion 20 comes into contact with it. There is.

A blade support shaft 31 is rotatably supported by a drive device (not shown) at the tip of the arm 4, and a fan-shaped slit 32 formed in the partition wall 2 is inserted into the support shaft to open the chamber A.
The circular saw 3 is attached at the position inside.

Incidentally, a slit 33 is bored on the top surface of the table 22 in the chamber A at a position corresponding to the circular saw 3.
The width of 3 is sufficient for the blade of the circular saw 3 to emerge on the table top surface through the slit, and the length is such that the arm 4 can swing within a range of approximately 90 degrees. It is.

The device of the present invention is constructed as described above, and when the arm 4 is tilted approximately horizontally within the case, the protrusion 20 of the arm 4 presses against the rear part of the screw rod 26, thereby causing the front a is raised upwardly against the spring 30, the elevating frame 24 is raised, and the press bar 21 is pulled up from the top surface of the table.

Therefore, when the wood 34 is inserted and the start button is pressed in this state, the motor 7 is driven and the arm 4 begins to swing upward, and as the contact with the protrusion 20 is released, the lever rod 26 is Lifting frame 24 is pulled by spring 30
, and push down the suppression bar 21 onto the top surface of the table so that the wood 34 is clamped at the position shown by the dashed dot line in the figure.

Therefore, when this pressure is reached, the circular saw 3 comes out from the slit 33 of the table to the top surface.
The wood 34 is cut during the process in which the arm 4 is raised to a right angle as shown by the two-dot chain line in the figure.

In the present invention, the cutting of the wood is carried out under a state where the wood is completely clamped by the suppression bar 21 as described above, and then the wood is cut by the arm 4.
is swung downward, the circular saw 3 sinks into the lower surface of the table 22, and the protrusion 20 on the lower surface of the arm 4 again contacts the lower end of the screw rod 26, causing the lifting frame 24 to move against the spring 30. By raising the holding bar 21 and forcing the restraining bar 21 to rise together, the cut wood can be easily removed.

From now on, the wood cutting process will be repeated in the same way.

As described above, the present invention has a structure in which a protrusion is provided on the arm, and the suppression bar is automatically raised and lowered in conjunction with the swinging of the arm via a screw rod that engages with the protrusion. It can be made more compact, and since there is no auxiliary force from the spring acting on the arm to reduce the load when cutting wood, it is possible to cut more efficiently than using a motor with a larger saw diameter with the same horsepower. In contrast, with the same saw diameter, it is extremely important to reduce the motor horsepower and contribute to cost reduction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway front view of the device of the present invention, and FIG. 2 is a longitudinal sectional view thereof. 1... Box, 2... Bulkhead, 3...
... Circular saw, 4 ... Arm, 7 ... - Motor, 10 ... Speed reducer, 13 ... Crank, 20 ... Protrusion body, 21...press bar, 22...table 23a, 23b
...Guide rod, 24... Lifting rod, 26
・・・・・・Rump, 30・・・Spring, 3
４・・・・・・Wood.

Claims (2)

[Scope of utility model registration request] (1) A circular saw is rotatably attached to the end of an arm of a certain length, and the circular saw is placed vertically upward so that the arm can swing within a certain fan-shaped angle range, and the lower end of the arm is supported. A steel shaft is attached to the shaft to engage the chino, the upper end of the chino is fixed above the arm, the lower end of the chino is fixed to the bottom of the machine via a spring, and the saw diameter is attached to the top of the table. Drill a slit on the top,
When the arm swings, the circular saw blade emerges from between the slits onto the top surface of the table and travels back and forth within the slits for a certain distance. A suppression bar with a U-shaped cross section, on which the tip edge of the circular saw blade can run, is installed so that it is guided by a guide rod installed upright on one side of the table, and the lower end of the lifting rod moves up and down. It is freely attached to one end of the front end of a lever rod which can swing freely using a pin supported on the machine base side as a fulcrum, and the central part of the lever is connected to a spring provided at the bottom of the machine base. On the other hand, the rear piece of the screw rod and the protrusion provided on the lower edge of the arm engage near the end of the downward swing of the arm due to the fan-shaped rotation. The arm is swung in a fan-shaped fixed angle range through a crank rotated by a motor and a crank rond that moves back and forth. When the arm swings, the protrusion on the lower edge of the arm engages with the rear piece of the screw rod to raise the suppression bar, but when the arm swings upward, the engagement disengages and the suppression bar lifts. automatically descends,
A wood cutting machine characterized in that it is configured to compress wood. (2) The wood cutting machine according to claim 1, wherein the circular saw is hidden in the machine stand when the suppression bar is raised.