JPH04152058A - Grinding method for wide belt sander - Google Patents

Abstract

PURPOSE:To prevent the wear of a table face, by performing no grinding in the state of the feeding direction of a feeding belt and the grinding direction of a sanding belt becoming the same, and grinding in the state of the feeding direction of the feeding belt and the grinding direction of the sanding belt becoming reverse. CONSTITUTION:In the case of feeding a work 2 with its reciprocating automatically by a feeding belt 3, no grinding is performed in the state (forward pass) of the feeding direction of a feeding belt 3 and the grinding direction of a sanding belt 4 becoming the same, and grinding is executed in the state (backward pass) of the feeding direction of the feeding belt 3 and the grinding direction of the sanding belt 4 becoming reverse. In the forward pass, a pad 45 is in the state of its descent, the work 2 is not ground and only fed by the feeding belt 3. Thus, the grinding powders of the chip of the work, the grinding wheel of the sanding belt, etc., are prevented from their intrusion between the work and a table and the wear of the table face can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wide belt sander for grinding the surface of a workpiece, and particularly to a method for grinding the same.

(Conventional technology) In conventional wide belt sanders, the workpiece is conveyed by a conveyor belt and then ground by a sanding belt, but the conveyor belt only conveys the workpiece in one direction when grinding the workpiece. Not done.

(Problems to be Solved by the Invention) Therefore, there is a problem in that at least two workers are required, one for sending the workpiece and the other for receiving the workpiece.

As a way to improve this, a wide belt sander 20 that can automatically reciprocate the workpiece 21 so that the supply side and the receiving side of the workpiece 21 can be done at the same position can be considered (Fig. 15 and (See Figure 16).

That is, when the workpiece 21 is automatically reciprocated by the feed belt 22, the forward path of the workpiece 21 is ground while the feed direction of the feed belt 22 and the grinding direction of the sanding belt 23 are the same. In addition, on the return journey of the workpiece 21, the workpiece 21 is ground 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 to each other.

When this was put into practical use, a problem arose in that the table 24, which was the material feeding surface, wore out.

In order to find out the cause of this, we observed the grinding condition and found that the material feeding direction of the material feeding belt 22 and the sanding belt 2
There is no problem when grinding is performed in the opposite direction to the grinding direction in step 3.

However, when grinding is performed with the material feeding direction of the material feeding belt 22 and the grinding direction of the sanding belt 23 being the same,
Since the rotation of the sanding belt 23 is fast (for example, about 1500*/sin), wind is generated by the sanding belt 23, and debris from the workpiece 21 and grinding powder from the grindstone of the sanding belt 23 are removed by the sanding belt 23. Since the grinding powder scatters along the direction and moves in the direction in which the workpiece 21 guides them, the grinding powder scatters along the workpiece 21.
It has been found that the particles get between the surface of the table 24 and the surface of the table 24, causing wear on the surface of the table 24 (see FIG. 16).

In order to prevent abrasion of the table surface, the present invention provides that when the workpiece 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 method for grinding with a wide belt sander, which performs grinding in a state where the material feeding direction of the material feeding belt and the grinding direction of the sanding belt are opposite to each other, without grinding in the state.

(Means for Solving the Problems) In order to achieve the above object, in the wide belt sander grinding method of the present invention, when the workpiece is automatically reciprocated with the material feeding belt, the material feeding belt is Grinding is not performed when the material feeding direction and the grinding direction of the sanding belt are the same, but grinding is performed when the material feeding direction of the material feeding belt and the grinding direction of the sanding belt are opposite.

(Example) 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 schematically consists of a material conveying belt 3 installed at the upper part of the apparatus main body for conveying the workpiece 2, and a material conveying belt 3 installed at the lower part of the apparatus main body for conveying the workpiece 2. The sanding belt 4 (abrasive belt) grinds the workpiece 2 (wood, for example, soft wood such as coniferous wood) that is fed by the abrasive belt 3.

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

On the back side of the sanding belt 4, there is a drive roll 41 that drives the sanding belt 4, and a tension roll 4.
2. An upper front roll 43.1 and a rear roll 44 are respectively arranged.

Between the upper front roll 43 and the first rear roll 44, there is a pad 4.
5 is supported so that it can be raised and lowered freely.

As shown in FIG. 3, the pad 45 is raised and lowered by an eccentric cam 48 connected to an operating rod 47 of a fluid cylinder (for example, an air cylinder) 4B.

The solid line shows the state where Bad 45 is raised, and the broken line shows the state where Bad 4 is raised.
5 shows a lowered state, and the pad 45 is controlled by a grinding control device 33, which will be described later.

In addition, 49 is a fluid cylinder (for example, an air cylinder)
This is an adjustment screw for finely adjusting 46.

The material conveying belt 3 is attached to an elevating frame 7, and the elevating frame 7 is supported by vertical guides 8.8 so as to be able to move up and down.

The elevating frame 7 includes an elevating motor 9 for elevating and lowering,
A drive motor 10 that drives the material conveying belt 3 is arranged.

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

On the back side of the material conveying belt 3, there is a material conveying belt side roll 3L31.
．． 31.31.31 comes into contact, and a spring (not shown) causes the
being pressed downwards.

A limit switch 32 is provided inside the material feeding belt side roll 31 to detect the vertical movement of the material feeding belt side roll 31.

The grinding control device 33 drives the material conveying belt 3 and controls the pad 45.
This is to control the lifting and lowering of the

That is, when the workpiece 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 are
In the state where the grinding direction of
(see FIG. 4), and grinding is performed in a state in which the material feeding direction of the material feeding belt 3 and the grinding direction of the sanding belt 4 are reversed (return path) (see FIG. 5).

On the outward journey, as shown in FIG.
In the lowered state (see the broken line in FIG. 3), the workpiece 2 is not ground, and the workpiece 2 is only fed by the feed belt 3.

When the workpiece 2 comes into contact with the material conveying belt 3, the material conveying belt side roll 31 moves upward and the limit switch 3 is activated.
2 is ONL, and then the contact state between the workpiece 2 and the material feeding belt 3 is released, so that the material feeding belt side roll 3
1 moves down to turn off the limit switch 32.

In other words, the limit switch 32 turns ON, and then a timer (not shown) operates in response to a signal that turns the limit switch 32 OFF, and 0.3 to 0.5 seconds elapse.
It is determined that the feeding of the workpiece 2 in one direction has been completed,
The grinding control device 33 rotates the drive motor IO in the opposite direction, controls the conveying direction of the material conveying belt 3 in the opposite direction, and controls the pad 45 to rise (see the solid line in FIG. 3). (see figure).

Therefore, when the workpiece 2 is fed from the right side to the left side in the drawing (outward path...see FIG. 4), the material feeding belt side drive roll 11 of the material feeding belt 3 rotates clockwise, and on the other hand, the sanding The drive roll 41 on the belt 4 side rotates counterclockwise and the pad 45 is lowered, so that the workpiece 2 is fed in the same direction as the material feeding belt 3 and the sanding belt 4 in the same direction. In the (Down Sanding) state, the lower surface of the workpiece 2 is not ground, and the workpiece 2 is simply fed.

Then, after finishing feeding the workpiece 2 in one direction (for example,
When the limit switch 32 turns ON, a timer (not shown) is activated by a signal that turns the limit switch 32 OFF, and after 0.3 to 0.5 seconds have elapsed), the grinding control device 33
, the conveying direction of the material conveying belt 3 is reversed, and the bad 45
In order to control the material to rise, the material is ground in a state in which the material feeding direction of the material feeding belt 3 and the grinding direction of the sanding belt 4 are opposite (Up Sanding).
(See Figure 5).

As a result, the workpiece 2 is not ground in the forward path when the material feeding direction of the material conveying belt 3 and the grinding direction of the sanding belt 4 are the same, and the returning path of the workpiece 2 is conversely Grinding is performed in an UpSanding state in which the feeding direction and the grinding direction of the sanding belt 4 are opposite, and the lower surface of the workpiece 2 is ground.

In this embodiment, the sanding belt 4 rotates counterclockwise. However, the present invention is not limited to this, and can also be applied to a case where the sanding belt 4 rotates clockwise. When the workpiece 2 is automatically reciprocated by the feed belt 3, the feed direction of the feed belt 3 and the grinding direction of the sanding belt 4 are reversed (outgoing path), and the grinding is performed as shown in Fig. 6. ), grinding is not performed when the material feeding direction of the material feeding belt 3 and the grinding direction of the sanding belt 4 are the same (return path) (see FIG. 7).

In addition, in the above embodiment, the sanding belt 4 is single, but the present invention is not limited to this. Needless to say, the present invention can also be applied to a wide belt sander such as a two-barrel type or a two-barrel type.

In this case as well, the workpiece 2 is transferred to the material conveying belt 3.
When automatically reciprocating the material with , grinding will not be performed if the material feeding direction of the material belt 3 and the grinding direction of the sanding belt 4 (4', 4") are the same, and the material feeding direction of the material belt is Grinding is performed with the sanding belt in the opposite direction.

That is, as shown in Fig. 8 and Fig. 9, in the outward pass (see Fig. 8), the pad is raised at 45° and the pad is lowered at 45° to perform rough grinding (for example, when the paper count is 120). For the return trip (see Figure 9) with the sanding belt 4°, lower the pad 45°, raise the pad 45°, and use the sanding belt 4° for final grinding (for example, paper count is 240). Alternatively, as shown in Figures 10 and 11, the outbound route (10th
(see Figure 11), the pads 45° and 45° are both lowered and no grinding is performed, and the return trip (see Figure 11) is performed by lowering the pads 45° and 45°.
Raise the pad 45° and the sanding belt 4° for rough grinding and the sanding belt 4° for finish grinding.
Rough grinding and finish grinding may be performed by
(See Fig. 2), the pad 45° and the pad 45° are both raised, rough grinding and finish grinding are performed using the sanding belt 4° for rough grinding and the sanding belt 4° for finish grinding. ) is pad 45°, pad 4
It is also possible to lower the angle by 5° so that no grinding is performed.

Further, in the above embodiment, pad grinding by raising and lowering the pad was explained, but the present invention is not limited to this.
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 indicates a state in which the drum 14 is raised and grinding is possible, and the broken line indicates a state in which the drum 14 is descended and cannot be ground (see FIG. 14).

Further, in the above embodiments, a wide belt sander of the bottom surface grinding type was explained, but the present invention is not limited to this. It goes without saying that the present invention can also be applied to a grinding type wide belt sander.

(Effects of the Invention) Since the present invention is configured as described above, it produces the effects described below.

In the grinding method of the wide belt sander of the present invention, when the workpiece is automatically reciprocated by the material feeding belt, the material cannot be ground if the material feeding direction of the material feeding belt and the grinding direction of the sanding belt are the same. First, since grinding is carried out with the material conveying direction of the material conveying belt and the grinding direction of the sanding belt being opposite to each other, scraps of the workpiece and grinding powder from the sanding belt's grindstone, etc., may be present between the workpiece and the table. In addition to preventing intrusion and abrasion of the table surface, the supply side and receiving side of the workpiece can be located at the same location, so the work can be done by one person, which also has the effect of saving labor. It is something.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing a wide belt sander to illustrate one embodiment of the present invention, and FIG.
FIG. 3 is a diagram for explaining the raised and lowered state of the pad, and FIGS. 4 and 5 are diagrams for explaining the first embodiment of the present invention. So, Figure 4 is
FIG. 5 is an explanatory diagram of the forward travel state, FIG. 6 and FIG. 7 are for explaining the second embodiment of the present invention, and FIG. 6 is an explanatory diagram of the forward travel state. FIG. 7 is an explanatory diagram of the returning state, FIGS. 8 and 9 are for explaining the third embodiment of the present invention, and FIG. 8 is an explanatory diagram of the outward state. FIG. 9 is an explanatory diagram of the return trip state,
10 and 11 are for explaining the fourth embodiment of the present invention.
Figure 1 is an explanatory diagram of the returning state, and the 12th and 13th
The drawings are for explaining the fifth embodiment of the present invention. FIG. 12 is an explanatory diagram of the outgoing state, FIG. 13 is an explanatory diagram of the returning state, and FIG. 14 is an explanatory diagram of the returning state. It is a schematic diagram for explaining drum grinding which is one embodiment, and is a 15th
The figure is a diagram schematically showing the grinding state of a wide belt sander which is a prior art for explaining the present invention.
FIG. 6 is a diagram showing the state of grinding powder generated when grinding is performed using a wide belt sander, which is a prior art for explaining the present invention. 1 ・ 3 ・ 4゜33・ 45, ・Wide belt sander/material feeding belt, 4°, 4°゛ ・・Sunday・grinding control device, 45°, 45°° ・・pad/workpiece material belt

Claims (1)

[Claims] In a wide belt sander grinding method in which a workpiece is sent by a feed belt and then ground by a sanding belt, when the workpiece is automatically reciprocated by the feed belt, the feed direction of the feed belt is A wide belt sander characterized in that grinding is not performed in a state where the material feeding direction of the material feeding belt and the grinding direction of the sanding belt are the same, and grinding is carried out in a state where the material feeding direction of the material feeding belt and the grinding direction of the sanding belt are opposite. Grinding method.