JPH0424184B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sanding belt forced running device for a belt sander, which eliminates the drawbacks caused by running the sanding belt under strong tension using a tension mechanism. It is.

(Prior art) As shown in Fig. 6, a conventional belt sander machine has a workpiece conveying path a formed by a conveying belt, etc., and a plurality of rolls c, d, and e including a positive drive roll c. A sanding belt f is provided with a drive guide mechanism b, and a sanding belt f is stretched around the guide mechanism b. One of the rolls d is a tension roll that presses the inner surface of the sanding belt, and an appropriate tension mechanism is also provided.For example, Japanese Utility Model Publication No. 53-38556,
There are documents such as Utility Model Publication No. 47-31029.

(Problems to be Solved by the Invention) The sanding belt f, which runs across the drive guide mechanism b, prevents slippage and harmful heat generation as described above, and also overcomes grinding resistance. It is strongly tensioned by a tension mechanism, and the drive roll c has a large diameter. However, a driving roll c and a driven roll e are installed front and back apart from each other in the upper part corresponding to the workpiece passage a, and a pressing pad h is provided between the two rolls to push the sanding belt f toward the workpiece passage a. If the grinding surface g is formed by the grinding surface g, undulations i shown in an exaggerated manner in FIG. 7 are generated between the front and rear rolls c and e in the width direction of the sanding belt f, particularly in the width direction of the grinding surface g. This phenomenon is the same when a wide tape is strongly stretched, and is not a phenomenon unique to sanding belts. However, when the ripples i are created on the grinding surface g, streaks in the feed direction are created on the surface of the workpiece to be ground. This results in a poor grinding effect. For this reason, pressure adjustments are made such as reducing the air pressure of the air bag provided in the pressure pad h, or adjusting the hardness of the sponge material used with or without the air bag. The effect is not fully realized. On the other hand, due to the strong tension of the sanding belt, the pressing pad h cannot demonstrate its inherent flexibility, resulting in poor conformability to distortions, warps, twists, etc. on the surface of the workpiece. In the process of sanding the painted surface of wood, there were defects such as excessive sanding in some areas, exposing the underlying material, preventing the expansion of the use of belt sanders that use strong tension, and the use of manual sanders. Many problems remain, including the inability to enter the field of abrasive grinding.
Therefore, it is determined that the defect of these belt sanders is that they rely solely on the tension action as described above for forced running of the sanding belt.

In the present invention, the sanding belt is loosely stretched around the drive guide mechanism with a tension that does not cause the sanding belt to slip when the workpiece is not being ground, and when the workpiece is being ground, the sanding belt is tensioned by a pressure roll without using the tension mechanism. The purpose is to eliminate the above-mentioned drawbacks of tension running.

(Means for Solving the Problems) The forced sanding belt running device of the belt sander machine of the present invention does not utilize the tension caused by the tension action of the sanding belt, which is the cause of various drawbacks in conventional models. The focus is on the fact that even when the sanding belt is lightly tensioned and hooked onto the drive guide mechanism, it runs without slipping when the workpiece is not being ground.It consists of multiple rolls corresponding to the workpiece transfer path. In a belt sander machine, a sanding belt is provided with a drive guide mechanism, a sanding belt is passed around the drive guide mechanism, and a pressing pad installed on the inner surface presses the sanding belt onto a workpiece transfer path to form a grinding surface. At least one roll corresponding to the workpiece transfer path in the guide mechanism is used as a drive roll, and the sanding belt is loosely wrapped around the drive guide mechanism with a tension that does not cause slipping when the workpiece is not being ground. A pressure roll is provided at a position to increase the contact area of the outer surface with the sanding belt, and is brought into contact with the fluid pressure of a cylinder, and the inner and outer surfaces of the sanding belt are pinched by the driving roll and the pressure roll during grinding. The feature is that the vehicle is driven by

(Embodiment) In the embodiment shown in FIG. 1, 1 is a workpiece transfer path constituted by a material transfer belt 2, 3 is a drive roll 4 that is actively rotated by a motor in the upper part of the transfer path 1, A drive guide mechanism composed of an upper tension/steering roll 5 and a driven roll 6 facing the workpiece transfer path 1 together with the driving roll 4, where the driving roll 4 and the driven roll 6 are small diameters having approximately the same diameter. The sanding belt 7 is placed around the drive guide mechanism 3, and a pressing pad 8 is placed on the inner surface of the sanding belt 7 between the drive roll 4 and the driven roll 6. is provided to connect the sanding belt 7 to the transfer path 1.
A grinding surface 9 is made to protrude toward the surface, and pressing rolls 11, 11 whose shafts are pressed by bullets 10, 10 are provided before and after the driving roll 4 and the driven roll 6.

The sanding belt 7 is the drive guide mechanism 3 described above.
In addition, when the material is not being processed, it is stretched with a gentle tension that allows it to be fed without slipping.

In the embodiment shown in FIG. 1, the tension/steering roll 5 is pressed against the inner surface of the sanding belt 7 by the cylinder 5a, but in the present invention, the fluid pressure sent to the cylinder 5a is lowered to match that pressure. As a result, the sanding belt 7 runs without slipping when not grinding the workpiece, and when grinding, the pressure is low enough to cause slipping due to the resistance of the pressurizing material.

In this embodiment, the roll 4 is used as a drive roll, and the sanding belt 7 is set to the drive guide mechanism 3 with the above-mentioned tension.
Selecting a position that further increases the contact area of the belt 7 with the drive roll 4 when the belt 7 is stretched over the drive roll 4,
A pressure roll 12 is provided which presses against the drive roll 4 by the fluid pressure of a cylinder 13, and the pressure roll 12
The sanding belt 7 is pressed between the drive roll 4 and the drive roll 4. Compared to the conventional belt sander shown in FIG. 6, the drive roll 4 has a smaller diameter as described above in order to reduce the plane occupied by the drive guide mechanism 3, and the pressure roll 12 is driven as shown in the figure. Contact is made from diagonally above the roll 4.

In the embodiment shown in FIG. 1, a sanding belt 7 is forced to run by being pinched by a drive roll 4 and a pressure roll 12, and the sanding belt 7 is undulated as shown in FIG. Not only does this not cause any turbulence, but the original flexibility of the pressing pad 8 is not lost.

In addition, even if the drive roll 4 is made small in diameter, the sanding belt 7 may run when cutting the workpiece, so the distance between the pressure rolls 11 to 11 is set to L.
can be shortened compared to the distance L' shown in FIG. 6, so the minimum length of the workpiece to be fed into the workpiece transfer path 1 can be made shorter than before.

In the embodiment shown in FIG. 2, the arrangement of the drive roll 4 and driven roll 5 of the drive guide mechanism 3 is reversed in the front and back direction from the embodiment of FIG. Pressing plates 14, 14 are provided,
A spring 15 is installed inside the upper running part of the material conveying belt 2.
A table plate 16 is provided to press the workpiece against the grinding surface 9, and the positions of the cylinder 13 and pressure roll 12 are reversed in the front and back direction from the embodiment shown in FIG. However, the rest of the structure is the same as that of the embodiment shown in FIG. 1, and the operation is also similar to that of the embodiment shown in FIG.

In the embodiment shown in FIG. 3, drive rolls 4a and 4b are used at the front and rear corresponding to the workpiece transfer path 1, and an interlocking chain 17 is applied to both rolls 4a and 4b, and the interlocking chain 17 is driven by a motor 18. shows. The cylinder 13 and pressure roll 12 are in the second position.
It is the same as the embodiment shown in the figure, but the other configuration is the first embodiment.
It is the same as the embodiment shown in the figure, and the operation is also similar to the embodiment shown in FIG.

The embodiment shown in FIG. 4 has the same basic configuration as the embodiment shown in FIG. 20
In this case, a cleaning liquid collection tray 21 is provided.

The embodiment shown in FIG. 5 is similar to the embodiment shown in FIG. 4 in that the sanding belt 7 is of a wet type, so a cleaning liquid spray nozzle 22 and a cleaning liquid injection nozzle are installed above the pressure roll 12 with respect to the sanding belt 7. A suction duct 23 is provided, and an auxiliary tank 24 for collecting leaked cleaning liquid is provided below the pressure roll 12.

In each of the embodiments shown in FIGS. 4 and 5, the action of the pressure roll 12 of the sanding belt 7 is the same as in the embodiment shown in FIG.

(Operations and Effects of the Invention) As clarified by the explanation of each embodiment in FIGS. 1 to 5, the present invention does not slip when the workpiece is not being ground, but is weak to the extent that it slips when the workpiece is being ground. In order to run the tensed sanding belt 7 also when grinding the workpiece, at least one or more of the rolls of the drive guide mechanism 3 corresponding to the workpiece transfer path 1 is used as a drive roll 4, and the drive roll 4 is A pressure roll 12 is provided to increase the contact area of the sanding belt 7 and come into elastic contact with the sanding belt 7, and when grinding the workpiece, the sanding belt 7 is sandwiched between the drive roll 4 and the pressure roll 12, and the sanding belt 7 is held under the weak tension as described above. The sanding belt 7 is further tensioned to cause it to run, and is used during the preparatory operation of the belt sander machine before grinding work, and before the pressure roll 12 is brought into pressure contact with the drive roll 4 via the sanding belt 7. However, since the belt 7 runs with a loose tension, it is possible to check whether the sanding belt 7 is damaged or not. This method has the effect of completely eliminating the drawbacks shown in FIG. 7 that occur in models with a drive guide mechanism that prevents slipping, and can improve the functionality of belt sanders and expand the range of their use.

[Brief explanation of drawings]

Figures 1 to 5 are side views showing Examples 1 to 5 of the present invention, Figure 6 is a side view of a conventional machine, and Figure 7 is a partially enlarged sectional view showing the same defects exaggerated. . 1 → Workpiece transfer path, 3 → Drive guide mechanism, 4 → Drive roll, 5 → Tension and steering roll, 5a
→ cylinder, 6 → driven roll, 7 → sanding belt, 8 → press pad, 9 → grinding surface, 10 → bullet machine, 11 → press roll, 12 → pressure roll.

Claims (1)

[Claims] 1. A drive guide mechanism consisting of a plurality of rolls is provided corresponding to the workpiece transfer path, a sanding belt is stretched around the drive guide mechanism, and the sanding belt is moved by a pressing pad installed on the inner surface of the drive guide mechanism. In a belt sander machine in which a grinding surface is formed by pressing a sanding belt onto a workpiece transfer path, at least one roll corresponding to the workpiece transfer path in the drive guide mechanism is used as a drive roll, and the sanding belt A pressurizing roll is provided, which is loosely wrapped around the drive guide mechanism with a tension that does not cause slippage during grinding, and which is contacted by fluid pressure of a cylinder or the like at a position that increases the contact area of the outer surface of the drive roll with the sanding belt. ,
A sanding belt forced running device for a belt sander machine, characterized in that during grinding, the driving roll and pressure roll press the inner and outer surfaces of the sanding belt and run the sanding belt.