JP2515266B2 - Safety cover with black line alignment mechanism of tabletop cutting machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tabletop cutting machine equipped with a safety cover that rotates around a drive shaft of a saw blade as a fulcrum, and is particularly mounted on a base. The present invention relates to a safety cover with a black line aligning mechanism having a function at the time of work for aligning a black line of a processed material with a blade tip position of a saw blade.

[Conventional technology]

Conventionally, in a tabletop cutting machine equipped with a safety cover that rotates around the saw blade axis, when aligning the saw blade with the black line marked on the cutting point of the workpiece, the worker uses the left hand to cut the workpiece on the base. Supporting and holding the body in a position that is comfortable for swinging the handle up and down with the right hand, the safety cover 10 shown by the solid line in Fig. 1 clearly sees the blade edge of the saw blade and the black line of the workpiece. I can't.

Therefore, in order to clearly see through the blade edge of the saw blade and the black tip of the processed material, rotate the safety cover to the open side by hand, and perform the black line alignment work while maintaining this open state. After the matching work, the cutting work was started after grasping the notching handle again.

[Problems to be Solved by the Invention]

Therefore, since the safety cover which is close to the blade is pressed by the hand, there is a risk that the hand comes into contact with the saw blade, and there is the inconvenience of re-gripping the cutting handle.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art,
It is to improve the safety and simplify the work at the time of black-line matching work.

[Means for solving the problem]

According to the present invention, a gear case is provided above the base so as to be vertically swingable toward the base surface, and the gear case covers the saw blade and the lower portion of the saw blade and rotates around the saw blade shaft. In a table-top cutting machine equipped with a safety cover, a swingable lever is pivotally supported on the swinging handle side of the gear case, one end of the lever is engaged with the safety cover, and the safety cover is swung by swinging the lever. It is pivotable upward, the other end is installed in a range where the handle and the lever can be operated at the same time, an elastic body is provided between the gear case and the safety cover, and the position of the center of gravity of the safety cover is the saw. The elastic body is placed at a position where a closing-side rotation moment larger than the opening-side rotation moment due to the weight of the safety cover is applied by the elastic body from the vicinity of moving right above the blade axis. It is characterized in that provided in Futikaba.

[Action]

Since the present invention is configured as described above, when cutting a processed material, when supporting the processed material with the left hand, gripping the cutting handle with the right hand, and swinging the lever with the thumb of the right hand or the like, While the lever engaging part and the safety cover hooking part are in contact with each other, the safety cover moves upward to expose the saw blade, and in this state, look at the saw blade in a straight line and use the left hand to draw the black line of the processed material. Can be matched to.

In addition, when the safety cover is rotated upward to facilitate smooth lever operation, if the center of gravity of the safety cover approaches directly above the saw blade axis, the safety cover will drop due to its own weight. Since the rotation moment is reduced, the amount of spring extension is reduced, and consideration is given to reduce the upward rotation power of the safety cover by the spring, so that the combined rotation moment of the safety cover is always in the closing direction of the safety cover. To Further, from the vicinity where the center of gravity of the safety cover is located right above the saw blade axis, it is considered that the rotation moment of the spring is applied in the closing direction of the safety cover.
With these, the safety cover can be rotated with a small turning force.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a tabletop cutting machine showing an embodiment of the present invention, and FIG. 2 is a partial sectional view showing a lever mounting portion.

In the figure, a fence 3 that supports the processed material 2 is fixed to the upper surface of the base 1, and a holder 4 is provided upright on the rear portion of the base 1. A gear case 6 is held on the upper end of the holder 4 so as to be vertically swingable with respect to the base 1 about a shaft 5 as a fulcrum. A saw blade 8 is rotatably attached to the gear case 6 around a saw shaft 7, and a handle 9 for cutting a workpiece is provided at the front end.
Holding A safety cover 10 covering the exposed portion of the lower portion of the saw blade 8 is rotatably held around the saw blade shaft 7.

A lever fulcrum 11 is provided on the gear case 6, and this lever fulcrum
A lever 12 swinging around 11 as a fulcrum is pivotally supported. lever
One end (engagement portion 12a) of 12 is a hook portion 13 of the safety cover 10.
Is engaged with. The other end of the lever 12 is located on the handle 9 side and is installed in a range where the handle 9 and the lever 12 can be operated simultaneously.

A spring 14 serving as an elastic body is held in the hook hooking hole 15 of the gear case 6 and the hook hooking hole 16 of the safety cover 10.

In the above configuration, when cutting the processed material 2, the processed material 2 is supported by the left hand and the cutting handle 9 is grasped by the right hand,
When the lever 12 is swung in the direction of arrow A in FIG. 3 with the thumb of the right hand, the engaging portion 12a of the lever 12 and the safety cover 10 are moved.
The safety cover 10 is rotated upward in the direction of the arrow B in FIG. 3 while the hooking portion 13 of the saw contacts, and the saw blade 8 is exposed. The safety cover 10 can be rotated to the position shown by the alternate long and short dash line in FIG. 3, and in this state, the saw blade 8 can be aligned with the black line of the processed material 2 with the left hand while looking in line. During the cutting operation, the right thumb is released from the lever 12 to return the safety cover 10 to the initial position. Next, the safety cover 10 swings the gear case 6 downward with the handle 9 to remove the processed material 2
When it comes into contact with the upper surface of the
It is possible to perform the cutting work while keeping the exposure of the.

Further, in order to allow the lever 12 to be operated smoothly, consideration should be given to minimizing the rotational moment due to the own weight of the safety cover 10. A point to be considered for safety is prevention of opening of the safety cover 10. At the upper limit position of the gear case 6 where the safety cover 10 shifts in the opening direction (the position where the processing material cutting handle 9 is not lowered), the safety cover 10 is opened. It is necessary to set the position of the spring 14 so that a rotational moment is applied in the closing direction.

The operation of the spring 14 will be described with reference to FIGS. 3 and 4. FIG. 3 is a partially enlarged view of the safety cover portion and shows the position 110 of the center of gravity of the safety cover 10. FIG. 4 shows the position 110 of the center of gravity 110 (110a to 110d) of the safety cover 10 and the spring 1 when the safety cover 10 is rotated at the gear case upper limit position.
The relationship between the four load points (16a to 16d) positions is plotted, and the center of gravity positions 110a, 110b, 110c, 110 of the safety cover 10 are plotted.
The load points 16a, 16b, 16c, 16d of the spring 14 correspond to d.

As can be seen from FIG. 4, when the safety cover 10 is rotated upward, when the center of gravity position 110 of the safety cover 10 approaches directly above the saw blade shaft 7, the rotation moment of the safety cover 10 due to its own weight is Springs from decreasing
The amount of extension of 14 is reduced, and the raising power of the safety cover 10 by the spring 14 is also reduced so that the combined rotation moment of the safety cover 10 is always in the closing direction of the safety cover 10. Furthermore, from the vicinity of the position where the center of gravity (110c position) of the safety cover 10 is located right above the saw blade shaft 7, it is considered that the rotational moment of the spring 14 is applied in the closing direction of the safety cover 10. As a result, the safety cover 10 is rotated with a small turning force, so that the safety cover 10 can be smoothly rotated by operating the lever 12.

Although the tension spring 14 is used as the elastic body in the above embodiment, the same effect can be obtained by using a torsion coil spring wound around the saw blade shaft 7.

〔The invention's effect〕

According to the present invention, since the lever for rotating the safety cover is provided while holding the notch handle, it is possible to improve the work efficiency of the black line alignment work.

In addition, there is no need to manually operate the safety cover, and safety can be improved at the same time.

Further, in order to reduce the operation load of the lever, a tension spring is arranged between the gear case and the safety cover to reduce the rotation moment due to the weight of the safety cover, and the lever can be smoothly operated.

[Brief description of drawings]

FIG. 1 is a side view of a tabletop cutting machine showing an embodiment of the present invention,
FIG. 2 is a partial cross-sectional view showing the lever mounting portion, FIG. 3 is a partially enlarged view of the safety cover portion, and FIG. 4 is an explanatory view when the safety cover is rotated. In the figure, 2 is a processed material, 7 is a saw blade shaft, 10 is a safety cover, 11 is a lever fulcrum, 12 is a lever, 12a is an engaging portion, 1
3 is a hooking portion, 14 is a spring, and 15 and 16 are hooking holes.

Claims (1)

(57) [Claims] 1. A gear case is provided above the base, which is swingable in the vertical direction toward the base surface, and the gear case covers the saw blade and the lower portion of the saw blade and rotates about the saw blade shaft. In a tabletop cutting machine having a safety cover, a swingable lever is pivotally supported on the swinging handle side of the gear case, one end of the lever is engaged with the safety cover, and the safety cover is swung by the lever. Is rotatable upward, the other end is installed in a range where the handle and the lever can be operated at the same time, an elastic body is provided between the gear case and the safety cover, and the position of the center of gravity of the safety cover is set as described above. The elastic body is attached to the gear case at a position where a closing-side rotation moment larger than the opening-side rotation moment due to the weight of the safety cover is applied by the elastic body from the vicinity of moving right above the blade shaft. Serial cutting-line alignment mechanism with Deposit cover miter saw, characterized in that provided in the Deposit cover.