JPH07261B2 - Wide belt sander grinding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wide belt sander for grinding a surface of a processed material, and particularly to a grinding method thereof.

(Prior Art) In a conventional wide belt sander, a material to be processed is sent by a material feeding belt and ground by a sanding belt, but the material feeding belt moves only in one direction when grinding the material to be processed. Not done.

(Problems to be Solved by the Invention) Therefore, there is a problem that the minimum number of workers is required to be one for sending and receiving the material to be processed.

As a method for improving this, a wide belt sander 20 capable of automatically reciprocally grinding the work material 21 is considered so that the supply side and the receiving side of the work material 21 can be located at the same position (Fig. 15 and (See Figure 16).

That is, when the material 21 is automatically sent back and forth by the material feeding belt 22, the material 21 is ground in the same direction as the material feeding direction of the material feeding belt 22 and the grinding direction of the sanding belt 23. On the other hand, the return path of the material to be processed 21 is such that the material feeding direction of the material feeding belt 22 and the grinding direction of the sanding belt 23 are opposite to each other.

When this was put to practical use, there was a problem that the table 24, which is the material feeding surface, was worn.

In order to find out the cause, when observing the grinding state, there is no problem when grinding is performed in a state in which the material feeding direction of the material feeding belt 22 and the grinding direction of the sanding belt 23 are opposite.

However, when the material feeding belt 22 and the sanding belt 23 are ground in the same direction, the sanding belt 23 rotates quickly (for example, about 1500 m /
min.), wind is generated by the sanding belt 23, scraps of the work material 21, grinding powder such as grindstones of the sanding belt 23 are scattered along the grinding direction of the sanding belt 23, and the work material 21 disperses them. Since it moves in the guiding direction, it was found that the grinding powder entered between the work material 21 and the table 24 and abraded the surface of the table 24 (see FIG. 16).

According to the present invention, in order to prevent abrasion of the table surface, when the material to be processed is automatically reciprocated by the material feeding belt, the material feeding direction of the material feeding belt and the grinding direction of the sanding belt are the same. It is an object of the present invention to provide a grinding method for a wide belt sander that does not grind in a state, but grinds in a state in which the material feeding direction of the material feeding belt and the grinding direction of the sanding belt are opposite.

(Means for Solving the Problems) In order to achieve the above object, in the method for grinding a wide belt sander of the present invention, when the material to be processed is automatically reciprocated by the material feeding belt, When the material feeding direction and the sanding belt grinding direction are the same, the grinding is not performed, but the material feeding belt grinding and the sanding belt grinding direction are opposite to each other.

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

FIG. 1 shows a wide belt sander 1. The wide belt sander 1 is roughly provided with a material feeding belt 3 for feeding a work material 2 provided in an upper portion of the apparatus main body and a feeding belt 3 provided in a lower portion of the apparatus main body. It is composed of a sanding belt 4 (abrasive belt) for grinding a material 2 to be processed (wood, for example, soft wood such as coniferous wood) sent by the material belt 3.

The sanding belt 4 is housed in the frame 13 and is located between the front table 5 and the rear table 6.

On the back side of the sanding belt 4, a driving roll 41 for driving the sanding belt 4, a tension roll 42,
An upper front roll 43 and an upper rear roll 44 are arranged respectively.

A pad 45 is supported between the upper front roll 43 and the upper rear roll 44 so as to be able to move up and down.

The pad 45 is, as shown in FIG. 3, an eccentric cam connected to an operating rod 47 of a fluid cylinder (for example, an air cylinder) 46.
It goes up and down by 48.

The solid line shows the state where the pad 45 is raised, and the broken line shows the state where the pad 45 is lowered. The pad 45 is controlled by the grinding control device 33 described later.

Incidentally, 49 is a fluid cylinder (for example, an air cylinder) 46.
It is an adjusting screw for finely adjusting.

The material feeding belt 3 is attached to an elevating frame 7, and the elevating frame 7 is supported by vertical guides 8 so as to be vertically movable.

The lifting frame 7 includes a lifting motor 9 for lifting and lowering,
A drive motor 10 for driving the material feeding belt 3 is arranged.

The drive motor 10 drives the material feeding belt side drive roll 11,
The material feeding belt 3 is driven via a material feeding belt side driving roll 11 and a material feeding belt side driven roll 12.

On the back side of the material feeding belt 3, the material feeding belt side rolls 31, 31,
31, 31, 31 are in contact with each other and pressed downward by a spring (not shown).

One of the rolls 31 on the feeding belt side is a roll on the feeding belt side.
A limit switch 32 for detecting the vertical movement of 31 is provided.

The grinding control device 33 controls driving of the material feeding belt 3 and elevation of the pad 45.

That is, when the material 2 is automatically reciprocated by the material feeding belt 3, the material feeding direction of the material feeding belt 3 and the sanding belt 4
Grinding is not performed in the same grinding direction (outward path) (see FIG. 4), but is grinded in a state (return path) in which the material feeding direction of the material feeding belt 3 is opposite to the grinding direction of the sanding belt 4. (See FIG. 5).

On the outward path, as shown in FIG. 4, the pad 45 is in the lowered state (see the broken line in FIG. 3), and the workpiece 2 is
The material to be processed 2 is only fed by the material feeding belt 3 without being ground.

When the work material 2 comes into contact with the material feeding belt 3, the material feeding belt side roll 31 moves upward and the limit switch 32 is moved.
After turning on, the contact state between the work material 2 and the material feeding belt 3 is released, whereby the material feeding belt side roll 31 moves downward and the limit switch 32 is turned off.

That is, the limit switch 32 is turned on, and then a timer (not shown) is activated by a signal that the limit switch 32 is turned off, and it is determined that the one-way feed of the work material 2 is completed when 0.3 to 0.5 seconds has elapsed. And grinding control device 33
Thereby, the drive motor 10 is rotated in the reverse direction to control the transfer direction of the material feeding belt 3 in the reverse direction, and the pad 45 is raised (the third position).
The control is performed so as to perform (see the solid line in the figure) (see FIG. 5).

Therefore, when the work material 2 is supplied from the right side to the left side in the drawing (outward path, see FIG. 4), the material feeding belt side driving roll 11 of the material feeding belt 3 rotates clockwise, and one side sanding Since the drive roll 41 on the belt 4 side rotates counterclockwise and the pad 45 descends, the workpiece 2 has the same feed direction of the feed belt 3 and the grinding direction of the sanding belt 4. In the (Down Sanding) state, the lower surface of the work material 2 is not ground, and only the work material 2 is fed.

Then, after the unidirectional feeding of the work material 2 is completed (for example,
The limit switch 32 turns ON, then the limit switch
A timer (not shown) is activated by the signal that 32 turns OFF.
After 0.5 seconds have passed), the grinding control device 33 controls the feeding direction of the feeding belt 3 in the opposite direction and raises the pad 45. Therefore, the feeding direction of the feeding belt 3 and the grinding direction of the sanding belt 4 are controlled. Grinding is performed in a state (Up Sanding) where and are opposite (see FIG. 5).

As a result, the outward path of the work material 2 is not ground when the material feed direction of the material feed belt 3 and the grinding direction of the sanding belt 4 are the same, and the return path of the work material 2 is the reverse of the material feed belt 3. The lower surface of the workpiece 2 is ground by grinding in the Up Sanding state in which the material feeding direction and the grinding direction of the sanding belt 4 are opposite.

In this embodiment, the sanding belt 4 has been described as being counterclockwise, but the present invention is not limited to this, and the sanding belt 4 having clockwise rotation is also applicable. When the material to be processed 2 is automatically fed back and forth by the material feeding belt 3, it is ground in a state where the material feeding direction of the material feeding belt 3 and the grinding direction of the sanding belt 4 are opposite (forward path) (Fig. 6). In the state where the material feeding direction of the material feeding belt 3 and the grinding direction of the sanding belt 4 are the same (return path), grinding is not performed (see FIG. 7).

Further, in the above-mentioned embodiment, the single sanding belt 4 has been described, but the present invention is not limited to this, and a plurality of sanding belts 4 are provided to perform rough grinding to finish grinding. Needless to say, the present invention can be applied to, for example, a wide belt sander of a double type, a triple type and the like.

In this case as well, the work material 2 is similarly fed to the material feeding belt 3
When automatically feeding back and forth with, the material feeding belt 3 does not grind when the material feeding direction is the same as the sanding belt 4 (4 ′, 4 ″) grinding direction. And the sanding belt is ground in the opposite direction.

That is, as shown in FIGS. 8 and 9, on the outward path (see FIG. 8), the pad 45 ′ is raised and the pad 45 ″ is lowered,
With the sanding belt 4'for rough grinding (for example, the paper count is 120), on the outward path (see FIG. 9), the pad 45 'is lowered and the pad 45 "is raised, and finish grinding (for example, the paper count is 240) sanding belt 4 ″ may be used for grinding, or, as shown in FIGS. 10 and 11, on the outward path (see FIG. 10), both pad 45 ′ and pad 45 ″ may be lowered. , Without grinding, in the return path (see Fig. 11), pad 45 ', pad 4
5 ″ may be raised together to perform rough grinding and finish grinding by the rough grinding sanding belt 4 ′ and the finish grinding sanding belt 4 ″. Further, as shown in FIG. 12 and FIG. (Refer to FIG. 12), both the pad 45 ′ and the pad 45 ″ are raised, and the rough grinding and finish grinding are performed by the rough grinding sanding belt 4 ′ and the finish grinding sanding belt 4 ″, and the return path (FIG. 13). ), Both the pad 45 'and the pad 45 "may be lowered so as not to grind.

Further, in the above-mentioned embodiment, the pad grinding by raising and lowering the pad has been described, but the present invention is not limited to this, and
For example, as shown in FIG. 14, it goes without saying that the present invention can also be applied to drum grinding in which the height of the drum is automatically raised and lowered.

The solid line shows the state where the drum 14 is raised and can be ground, and the broken line shows the state where the drum 14 is lowered and cannot be ground (see FIG. 14).

Further, in the above-mentioned embodiment, the wide-belt sander of the lower surface grinding type has been described, but the present invention is not limited to this, and for example, the upper surface grinding type described in Japanese Utility Model Laid-Open No. 64-16253. Of course, it can be applied to the wide belt sander of.

(Effect of the Invention) Since the present invention is configured as described above, it has the following effects.

The method for grinding a wide belt sander of the present invention, when the material to be processed is automatically reciprocated by the material feeding belt, the material is fed in the same direction as the material feeding direction of the material feeding belt and the grinding direction of the sanding belt. Instead, grinding is performed in a state where the feeding direction of the feeding belt and the grinding direction of the sanding belt are opposite to each other.Therefore, scraps of the work material, grinding powder such as a grinding stone of the sanding belt, etc. may be generated between the work material and the table. It is possible to prevent entry and prevent abrasion of the table surface, and since the work material supply side and work material reception side can be located at the same position, the work can be performed by one person, and labor saving is also achieved. It is a thing.

[Brief description of drawings]

FIG. 1 is a front view schematically showing a wide belt sander for showing an embodiment of the present invention, and FIG.
FIG. 3 is a schematic side view of the drawing, FIG. 3 is a drawing for explaining an up-and-down state of a pad, and FIGS. 4 and 5 are for explaining a first embodiment of the present invention. So, in Figure 4,
FIG. 5 is an explanatory view of a forward path state, FIG. 5 is an explanatory view of a return path state, FIGS. 6 and 7 are for explaining a second embodiment of the present invention, and FIG. 6 is a forward path state. And FIG. 7 are explanatory views of a return path state, FIGS. 8 and 9 are for explaining a third embodiment of the present invention, and FIG.
FIG. 9 is an explanatory view of a forward path state, FIG. 9 is an explanatory view of a return path state, FIGS. 10 and 11 are for explaining a fourth embodiment of the present invention, and FIG. 10 is a forward path state. And FIG. 11 are explanatory views of a return path state, FIGS. 12 and 13 are for explaining a fifth embodiment of the present invention, and FIG.
Explanatory diagram of the forward path state, FIG. 13 is an explanatory diagram of the return path state, FIG. 14 is a schematic diagram for explaining the drum grinding which is one embodiment of the present invention, and FIG. 15 is FIG. 16 is a diagram schematically showing a grinding state of a wide belt sander which is a prior art for explaining the present invention, and FIG. 16 is a diagram showing a grinding state by a wide belt sander which is a prior art for explaining the present invention. It is a figure which shows the state of the grinding powder produced. 1 …… Wide belt sander, 2 …… Working material 3 …… Feeding belt, 4,4 ′, 4 ″ …… Sanding belt 33 …… Grinding control device, 45, 45 ′, 45 ″ …… Pad

Claims (1)

[Claims] 1. A grinding method of a wide belt sander for feeding a work material by a feed belt and grinding it by a sanding belt, wherein the feed material is automatically fed back and forth by the feed belt. The grinding is not performed in a state in which the material feeding direction of the belt and the grinding direction of the sanding belt are the same, and the grinding is performed in a state in which the material feeding direction of the material feeding belt and the grinding direction of the sanding belt are opposite. Wide belt sander grinding method.