JPS5845041Y2 - Marunokobantounomotsukouki - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch opening/closing device for a circular saw machine.

Conventionally, in this type of circular saw machine, electricity is left on from the start of work to the end of work, so even when not working, the noise of gears, motor cooling fans, and saw blade noise can be a problem for not only the operator but also the operator. This has the disadvantage that it causes discomfort to the people around it and causes noise pollution, and that when the saw blade is idling at high speed, it is likely to cause an unexpected accident to the operator.

As a prior art to eliminate the above-mentioned drawbacks,
Although there is a device in No. 18796, this device has the following drawbacks.

That is, in the circular saw machine shown in Fig. 4, there are two switches a,
b are arranged in front and back, so when switch a on the left in the figure is normal and only switch b on the right in the figure cannot close, a short workpiece is fed and the rear end of the same village is connected to the left switch. When the saw blade C leaves the position a, the rotating saw blade C remains stationary, which has the disadvantage of easily causing an unexpected accident for the operator.

The purpose of this invention is to eliminate not only the drawbacks of conventional circular saw machines but also the drawbacks of the previous invention described above. The purpose of the present invention is to provide a switch opening/closing device for a saw machine.

Hereinafter, one embodiment of the present invention will be explained according to the drawings. In the drawing, 1 shows the entire circular saw machine, 2 is a box-shaped workbench, the upper surface of which becomes the surface plate surface 2a, and the lower part of which is the machine stand. (
Not shown.

) is fixed. 3 is a saw blade rotated by an electric motor M, which is rotatably mounted on the left side of the workbench 2 in the figure;
Its upper part protrudes from a saw blade opening 15 opened in the surface plate surface 2a.

4 is a cutting line (not shown) of the saw blade 3 along the lower surface of the surface plate in the workbench 2.

) is a lever for opening and closing a switch provided on the top, the base of which is attached to the end of the workbench 2 on the material feeding side by an L-shaped bracket 5 with six pins so as to be swingable, and the lever is for opening and closing the switch. A first driven part 7 is fully protruded upward at approximately the middle of the upper edge of the saw blade 4, and this first driven part 7 has a first opening 16 opened in the surface plate surface 2a near the processing side of the saw blade 3. It can appear and retract from the surface plate surface 2a.

At the tip of the switch opening/closing lever 4, a substantially U-shaped trident 8 is formed with second driven parts 9, 9 formed horizontally upward, and the second driven parts 9, 9 are On both sides of the saw blade 3, press the surface plate surface 2a to a position near the center of the opening force 3.
The second opening portion 17.17 is open to the surface of the surface plate 2a.

9 a , 9 a are the tips of switch opening/closing levers 4 formed so as to be able to come into contact with the lower surface of the surface plate surface 2 a; 10 is a nomit switch attached to the feed material of the workpiece W in the workbench 2; , as shown in FIG. 3, is connected in series with the power switch SW of the electric motor M for rotating the saw blade 3, and the tactile rod 11 of the limit switch 10 is connected to a spring (not shown).

) always urges the lower edge of the switch opening/closing lever 4 upward, and when the switch opening/closing lever 4 is tilted upward, this limit switch 10 is opened.

12 is a side blade provided on the surface plate surface 2a of the workbench 2 behind the saw blade 3 (to the left in the figure); 13 is a safety cover attached to a part of the workbench 2 via a mounting rod 14; .

Subsequently, the functions and effects of this embodiment will be specifically explained.

Now, when the workpiece W is not placed on the surface plate surface 2a of the workbench 2, the tactile rod 11 of the limit switch 10
is a spring (not shown).

), and the switch opening/closing lever 4 is kept pushed upward, so that the limit switch 10 is opened (see the solid line in FIG. 2).

Therefore, in this state, even if the power switch SW is closed, the electric motor M remains stopped.

Therefore, when the workpiece W placed on the feeding side on the surface plate surface 2a is moved toward the saw blade 3 side, the workpiece W presses down the first passive part 7, so the switch opening/closing lever 4 is tilted downward. 2, the limit switch 10 is closed via the touch rod 11, the electric motor M rotates, and the saw blade 3 is rotated to cut the workpiece W. It will be done.

Next, even if the end of the workpiece W is separated from the first passive part 7,
The next second passive part 9 is pressed down by the workpiece W, which closes the limit switch 10, and the cutting of the workpiece W continues. When the end of the workpiece W is separated from the second driven parts 9, 9, the switch opening/closing lever 4 is pushed upward by the biasing force of the touch rod 11 to release the pressed state. tilted.

Therefore, the limit switch 10 is opened and the electric motor M
is automatically stopped and the rotation of the saw blade 3 is stopped, and the saw blade 3 is always stopped except during cutting work.

Now, in the present invention, a pin 6 is attached to the lower surface of the surface plate of the workbench of a circular saw machine so that the base of the switch opening/closing lever 4, which runs along the lower surface, can be pivoted relative to the end of the workbench on the material feeding side. At the same time, a tactile rod 11 of a limit switch 10 connected in series to the power switch SW of the circular saw machine is interlocked approximately in the middle of the lower edge of the switch opening/closing lever 4. A first passive part 7 protruding in the middle of the edge is provided so as to be able to move in and out of the surface plate near the processing side of the saw blade, and is formed almost horizontally with respect to the tip of the switch opening/closing lever 4. A second passive part 9 is provided so as to be able to protrude and retract from the surface plate on the side of the saw blade between a position near the center of the saw blade and a position near the front edge of the saw blade. The limit switch 10 is configured to be closed at the lower edge of the switch opening/closing lever 4 when the first or second passive part is retracted from the surface plate surface on the lower surface. Effects can be obtained.

(1) Unlike conventional devices in which two switches are provided, one limit switch is used to open and close, which has the effect of halving the failure rate of the limit switch 10.

(2) Since the limit switch 10 is attached to the lower surface of the switch opening/closing lever 4, unlike conventional devices, it is less likely to become inoperable due to saw chips, resulting in increased durability.

(3) Since the second driven part 9 of the switch opening/closing lever 4 is horizontally shaped upward, unlike conventional devices, the starting end of the workpiece can be driven early, and Even when machining shorter workpieces than with the machine, the risk of the saw blade stopping can be eliminated.

(4) When the terminal end of the workpiece passes through the second passive part 9, even if the downward pressure at the terminal end weakens, the lever ratio of the switch opening/closing lever 4 will limit the limit. It has the feature of ensuring closing operation for the switch.

Therefore, it can be said that the present invention is an extremely practical and desirable switch opening/closing device for a circular saw machine.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a schematic plan view, FIG. 2 is a side sectional view, and FIG. 3 is an electric circuit diagram. FIG. 4 is a plan view showing one of the conventional techniques. 2... Workbench, 2a... Surface plate surface, 3.
...Saw blade, 4...Switch opening/closing lever, 7...First passive part, 9...Second passive part, 10...・Limit switch, SW...
...Power switch.

Claims (1)

[Scope of utility model registration request] Six pins are attached to the lower surface of the surface plate of the circular saw workbench so that the base of the switch opening/closing lever 4 that runs along the lower surface can swing relative to the material feeding side end of the workbench. A tactile rod 11 of a limit switch 10 connected in series to the power switch SW of the circular saw machine is interlocked approximately in the middle of the lower edge of the switch opening/closing lever 4, and further approximately in the middle of the upper edge of the switch opening/closing lever 4. A protruding first passive part 7 is provided so as to be retractable from the surface of the surface plate near the processing side of the saw blade, and a second passive part 9 is provided substantially horizontally to the tip of the switch opening/closing lever 4. The saw blade is provided so as to be able to protrude and retract from the surface plate on the side of the saw blade between a position near the center of the saw blade and a position near the front edge of the saw blade, and the first or second 2. A switch opening/closing device for a circular saw machine, wherein the limit switch 10 is closed at the lower edge of the switch opening/closing lever 4 when the second passive part is retracted from the surface plate surface.