JPS64184B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a polishing device for a belt sander used in a wood polishing device.

<Prior art> In the belt sander, a cleaning liquid is sprayed from a cleaning liquid injection nozzle onto the abrasive grain surface of the abrasive belt wound around a plurality of support rolls to clean the abrasive grain surface and prevent clogging. This is widely known to the general public.

In addition, in order to prevent the cleaning liquid supplied to the belt surface from acting on the workpiece, a draining roll is brought into pressure contact with the support roll on which the abrasive belt is stretched, via the belt, and the pressure is applied to the belt surface. The device designed to remove excess cleaning solution is
It is well known as disclosed in Japanese Patent Publication No. 49-3438 and Japanese Patent Publication No. 43237-1987.

By the way, the roll located farthest from the running material path, such as the support roll 9 in FIG. 1, usually serves as a steering roll and cannot be constantly pressed against the draining roll due to its oscillating motion. . Therefore, in the above structure, the drain roll is brought into pressure contact with the support roll on the running material path side. However, in this case, the drain roll increases the width of the polishing device on the running material path side, and as a result, it is necessary to increase the distance between the pressure rolls disposed before and after the polishing device. On the other hand, in order to convey the workpiece well, it is necessary to apply the pressing force of the rolls to the workpiece at all times during the feed. Therefore, the shortest scale of the workpiece is the pressure of the pressure roll. Determined by interval. However, due to the above reasons,
Since the spacing becomes large, the above configuration results in severe restrictions on the application of short-length processed materials.

In addition, some of the support rolls on the running material path side have a mechanism that can be applied to roll grinding by repositioning them to the running material path side rather than the tread pressure pad.
This movement makes it impossible to maintain good contact with the draining roll, thus making it impossible to apply the mechanism. As described above, the above configuration has various drawbacks.

Therefore, as shown in FIG. 4, a receiving roll b is arranged inside the abrasive belt a separately from the supporting roll, and a draining roll c is pressed against the receiving roll b side via the belt a. Due to the pressure contact force, the draining roll c
It has been proposed to eliminate the drawbacks of the conventional structure by rotating the belt A to remove excess liquid.

<Problems to be Solved by the Invention> By the way, when the draining roll c is pressed against the belt a at the straight running portion of the belt a, the pressing force becomes a resistance to the running of the belt a.
As shown in Figure 4, belt a has wrinkles x at the draining part.
occurs. When the wrinkles x occur, the cleaning liquid tends to scatter around the outside of the designated area. In addition, in the conventional configuration, one of the support rolls is used as a drive roll, and the other support rolls are driven as the belt runs.
Since it rotates freely, due to the pressure contact resistance,
The belt tends to slip against the support roll, making it impossible to grind or polish the workpiece to a predetermined thickness.

An object of the present invention is to provide a polishing apparatus having a configuration capable of eliminating the above-mentioned drawbacks.

<Means for Solving the Problems> The present invention comprises: a cleaning liquid spray nozzle installed opposite to the abrasive grain surface of an abrasive belt stretched around a plurality of support rolls; Polishing comprising a draining device disposed between the polishing area near the passage side and consisting of a receiving roll located inside the polishing belt and a draining roll that presses against the receiving roll side through the polishing belt. The apparatus is characterized in that the support roll is driven by all wheels, and the rotational driving force to the support roll is also transmitted to the draining roll via a winding intermediate joint.

Here, examples of wrapping media include chains, belts, and ropes.

<Function> Since driving force is also applied to the draining roll, a feeding force is applied to the polishing belt at the draining portion of the polishing belt. Therefore, the belt runs without succumbing to the pressure contact resistance of the draining roll, and at the entrance of the pressure contact part,
No wrinkles x will occur. Furthermore, since the driving force acts on all of the support rolls around which the belt is wound, slippage of the belt on the support rolls is eliminated as much as possible.

<Example> FIG. 1 shows an overview of a belt sander machine.

Here, 1 is a running material device, and a drive roll 2
An endless running belt 4 is wound around the driven roll 3, and the upper horizontal running part is used as a material feeding part.

A material feeding passage 5 is placed on the material running device 1,
A polishing device 6 is provided.

The polishing device 6 has support rolls 7 and 8 disposed along the material feeding path 5 and a support roll 9 which also serves as a steering wheel above the support rolls 7 and 8 and is arranged in a triangular shape.
A polishing belt 10 is wrapped around the belt 9. The support roll 9 also functions as a tension roll that tightens the abrasive belt 10 using a pressure cylinder 11 (see FIG. 2).

A treading device 12 is disposed inside the polishing belt 10 between the support rolls 7 and 8, and its lower surface serves as a polishing portion. The treading device 12 pushes the polishing belt 1 when the front end of the workpiece reaches the polishing site.
0 to the material feeding path 5 side, and timing control is performed to release the treading force when the workpiece passes, and has the function of properly polishing the upper surface of the workpiece.

A cleaning liquid spray nozzle 14 is disposed between the support rolls 8 and 9 with its mouth end facing the abrasive grain surface of the polishing belt 10 , and a receiver located inside the polishing belt 10 is located directly below the cleaning liquid spray nozzle 14 . A draining device consisting of a roll 15 and a draining roll 16 located on the outside is provided. The draining roll 16 is covered with an elastic body such as rubber, and is covered with a pressing cylinder 17.
(See FIG. 2), it can be arbitrarily converted into a pressure-contact position and a non-pressure-contact position with respect to the abrasive belt 10.

In this non-pressure contact position, the draining roll 16
is out of contact with the abrasive belt 10, and in this state, the receiving roll 15 is released from contact with the abrasive belt 10. For this reason, the polishing belt 1
0 does not come into contact with either the receiving roll 15 or the draining roll 16 and can be run without resistance.

In addition, in the pressure welding device, the drain roll 16
The abrasive belt 10 is pressed against the receiving roll 15 side, and in this state, the abrasive belt 10 is pressed against the receiving roll 15.
5 and a draining roll 16. In this state, the cleaning liquid is sprayed from the cleaning liquid injection nozzle 14 onto the surface of the polishing belt 10, and the liquid is stored in the V-shaped gap 18 formed between the polishing belt 10 and the draining roll 16. The mouth end of a liquid collection duct 19 is disposed above the V-shaped gap 18, and the cleaning liquid stored in the gap 18 is recovered by its suction action. Further, a saucer 21 is provided at the lower part of the drain roll 16, and the cleaning liquid dripped from the surface of the drain roll 16 is collected.

In addition, at the front and rear of the polishing device 6, there are pressure rolls 24, 24 that are urged toward the material feeding path 5 by bullets.
is provided.

Next, the main part of the present invention will be explained with reference to FIG.

Sprockets 25, 26, and 27 are fixed to the shaft ends of the support rolls 7, 8, and 9, respectively, and an endless chain 28 is stretched around the sprockets 25-27. At a location between the sprockets 25 and 26, a tension sprocket 30 is engaged on the inside of the chain 28, which is biased outwardly by a cylinder 29 to maintain its tension. Further, sprockets 31 and 32 are also fixed to the shafts of the support rolls 7 and 8, and an endless chain 3 is attached to the sprocket 33 provided on the drive shaft of the drive motor M and the sprockets 31 and 32.
4 is being passed.

A sprocket 35 is also fixed to the rotating shaft of the draining roll 16, and is linked to the sprocket 36 fixed to the shaft of the support roll 8 through an endless chain 37. The chain 37 is tensioned by a tension sprocket 38. The number of teeth of the sprocket 35 is selected so that the circumferential speed of the draining roll 16 substantially matches the running speed of the polishing belt 10.

With this drive mechanism, when the drive motor M is driven, the support rolls 7 and 8 are rotated by the running of the chain 34, and this rotational force is transferred to the chain 28.
is transmitted to the support roll 9 by. Therefore, each support roll 7, 8, 9 becomes an all-wheel drive, causing the abrasive belt 10 wrapped around the roll group to run. The chain 37 also applies the driving force of the drive motor M to the draining roll 16, causing it to rotate.

Therefore, when the excess cleaning liquid is removed by the draining roll 16, the driving force is applied to the draining roll 16, so that the abrasive belt 10 is fed along with the pressure contact. For this reason, the abrasive belt 10 runs while being held in a tensioned state at the drain section. Further, the support roll 7,
Due to the all-wheel drive of the wheels 8 and 9, slips on the abrasive belt 10 are also eliminated as much as possible.

In addition, as in this embodiment, the pressing cylinder 17
, the draining roll 16 can be changed at will between a pressure contact position and a non-pressure contact position with respect to the abrasive belt 10, and when pressing the draining roll 16 against the running abrasive belt 10, the roll When the polishing belt 16 is not applied with a driving force and is in a non-rotating state, a large load is applied to the polishing belt 10 during the press contact. However, with the above configuration, the peripheral speed of the draining roll 16 is lower than that of the polishing belt 10.
Since the rotation equal to the speed of is given in advance, the load during pressure welding is small.

In addition, the support roll 8 is made movable by an eccentric shaft or the like, as shown by the chain line in FIG. Good too. Due to this positional change, the upper surface of the workpiece is subjected to roll grinding by the support roll 8, and heavy grinding becomes possible. In this case, in order to enable the movement of the support roll 8 and to maintain the tightness of the chain 34, the chain 34 is made to have a sufficient length;
A tension device is arranged on its inner surface.

FIG. 3 shows another embodiment of the drive mechanism for the draining roll 16.

Here, a friction wheel 40 is in pressure contact with the draining roll 16. A sprocket 41 is fixed to the rotating shaft of the friction wheel 40, and is linked to a sprocket 42 fixed to the rotating shaft of the support roll 9 through an endless chain 43. The chain 43 is tensioned by a tension sprocket 44.

In this configuration, the driving force of the support roll 9 is transmitted to the friction wheel 40 through the chain 43, and the driving force is transmitted to the draining roll 16 via the friction wheel 40, so that it is driven. Rotate.

Although each of the above embodiments has been described with respect to a top surface grinding type, the present invention can also be applied to a bottom surface grinding type.

<Effects of the Invention> As described above, the present invention provides an all-wheel drive for the support roll and applies a driving rotational force to the draining roll that presses against the abrasive belt. This has excellent effects such as preventing the occurrence of wrinkles x and slipping of the abrasive belt, allowing the abrasive belt to run evenly, and making the action of the draining roll more effective.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, and FIG. 1 is a schematic side view, FIG. 2 is a schematic side view showing a drive mechanism, and FIG. 3 is a schematic side view showing another embodiment of the drive mechanism.
FIG. 4 is a side view of the main parts showing the conventional drawbacks. 6; Polishing device, 7, 8, 9; Support roll, 1
0; Polishing belt, 14; Cleaning liquid spray nozzle, 1
5; Receiving roll, 16; Draining roll, 17; Pressing cylinder, 18; V-shaped gap, 28, 34, 37,
43; Chain, 40; Friction wheel.

Claims (1)

[Scope of Claims] 1. A cleaning liquid spray nozzle installed opposite to the abrasive grain surface of an abrasive belt stretched over a plurality of support rolls, and a cleaning liquid spray nozzle installed along the running direction of the belt from the spray nozzle to a polishing area near the running material path. A polishing device comprising a receiving roll disposed between the polishing belt and located inside the polishing belt, and a draining device consisting of a draining roll that presses against the receiving roll through the polishing belt. A polishing device for a belt sander, characterized in that it has an all-wheel drive and the rotational driving force to the support roll is also transmitted to a draining roll via a winding medium.