JPS6374561A - Belt sanding machine - Google Patents

Abstract

PURPOSE:To form a belt sanding machine applicable for a work material of very small thickness, by placing a pressure receiving surface, formed on a pressing member, serving for one part of a material feed table, when the work material is fed, while retreating from the material feed table except when the work material is fed. CONSTITUTION:In the case of polishing a work material W of very small thickness, while said work material W is not supplied, a pressing member 42 places its pressure receiving surface 43 in a retreating position retracting from a material feed table 6 by a driving gear 54 of a pressure receiving device 7. Consequently, a sanding belt 18, even if its end edge is set to a position exceeding a table surface of the material feed table 6, is prevented from grinding the material feed table 6. Next the pressure receiving surface 43 of the pressing force receiving part 42, immediately before the work material W is placed just below the belt 18, is converted swivelling to a pressure receiving position, constituting one part of the material feed table 6, by automatically or manually driving the driving gear 54. In this position, the work material W, in which its one surface is held to the pressing member while the other surface receives a grinding pressure of the belt 18, is ground and polished.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a belt sander machine that grinds and polishes the surface of wood, which is ideal for grinding and polishing thin plates.

<Prior art> A belt sander that produces a constant amount of grinding regardless of uneven thickness or warping of the workpiece, and is ideal for grinding and polishing nine plate-shaped workpieces, is disclosed in Japanese Patent Publication No. 44-2959. It is known as disclosed in .

In this system, an endless sanding belt is passed around a group of grinding rolls including a sanding roll which is placed opposite to a material feeding table with a material feeding path, and the sanding rolls are opposed to each other via the material feeding table and the material feeding path before and after the sanding roll. A guide surface is arranged so that the grinding amount is determined by the level difference between the guide surface and the roll, and a plurality of material feed drive rolls are exposed on the material feed table, and the workpiece is driven by the drive roll. The structure is such that a feeding force is applied to the material so that the material travels while being pressed against the guide surface.

<Problems to be Solved by the Invention> By the way, this type of grinder is used for grinding and polishing thin plates from 0.2 mm to 10 m+w. For this reason, when a rubber roll is used as the sanding roll, in order to grind and polish the workpiece to a predetermined thickness, it may be necessary to bring the sanding belt close enough to press the workpiece table.

By the way, in this case, the sanding belt is normally driven all the time, so if there is no material to be processed, the material feeding table facing the sanding roll may be scraped off and damaged by the sanding belt, or the sanding belt may be worn out. It can become intense. Therefore, in the conventional configuration, there is a limit to the thinness of the processed material to which it can be applied.

An object of the present invention is to provide a wide belt sander having a configuration that addresses such technical problems.

Means for Solving the Problems> The present invention provides a swingable pivot which includes a pressure-receiving surface exposed from a protruding groove formed in the material feeding table at a portion of the material feeding frame that faces the sanding roll. a supported pressure receiving part; and a drive device that swings and converts the pressure receiving surface of the pressure receiving part into a receiving position constituting a part of the material feeding table and a retracted position retreating from the material feeding table. It is characterized by being equipped with a pressure receiving control device.

When grinding and polishing an extremely thin workpiece, the drive device of the pressure receiving device moves the pressure receiving part so that its pressure receiving surface is set back from the material feeding table while the workpiece is not being supplied. Set to evacuation position. Therefore, even if the edge of the sanding belt is set at a position beyond the table surface of the material feeding table, the material feeding table will not be scraped by the belt.

Next, just before the workpiece comes directly under the sanding belt, the drive device is driven automatically or manually,
The pressure-receiving surface of the pressure-receiving portion is swing-converted to a pressure-receiving position constituting a part of the material feeding table. In this position, the workpiece is held with its lower side by the suppressing member, and subjected to the grinding pressure of the sanding belt on its other side to undergo grinding and polishing.

<Example> An embodiment of the invention will be described with reference to the accompanying drawings.

il, 2, 1 is the lower frame, and the L part thereof has a lifting screw (not shown) that rotates in conjunction with the handle 4.
A material feeding frame 5 supported so as to be movable up and down is provided. The material feeding frame 5 is provided with a pressure receiving control device 7, which will be described later, and driving rollers 8a and 8b at front and rear positions thereof, and their upper edges are exposed from the material feeding table 6. The lower surface of the workpiece W supplied onto the workpiece feeding table 6 comes into contact with the circumferential surfaces of drive rollers 8a and 8b that apply a feed force to the workpiece W.

A vertical frame 15 is supported on the material feeding frame 5. The vertical frame 15 has a cylinder on its upper part,
A running roll 16, which is biased upward by a spring or the like and serves both as steering and tension, is arranged to be movable up and down. Furthermore, a sanding roll 17 is provided at the bottom of the running roll 16.
is provided, is provided with a driving force by a drive motor (not shown), and is opposed to the material feeding table 6 via a material feeding path. That is, the running roll 16 and the sanding roll 1
7 constitutes a grinding roll group. An endless sanding belt 18 is stretched between the traveling roll 16 and the sanding roll 17, and the sanding roll 17 drives and travels in the direction of the arrow in FIG. 1.2.

As clearly shown in the left awn of FIG. 2, on both sides of the sanding roll 17, support shafts 20.20 are spanned across the front and rear mounting portions 19 of the vertical frame 15 in the width direction. A suppressing member 21.21 that supports a suppressing roll 23.23 in a freely rotatable manner is fitted to 20. and,
An elastic force fi22 such as a spring acts on the suppressing member 21.21, urges the suppressing roll 23.23 downward toward the material feeding table 6, and holds it at the lowest position where it is stopped by the stopper 24. .

Further, as clearly shown in the second position, shaft pieces 26 are in contact with the guide groove surfaces 25 of the 17 sanding rolls of the mounting portion 19 on both sides of the sanding roll 17. The shaft piece 26 is supported by an adjustment screw 27 supported by the mounting portion 19, and can be slightly raised and lowered by rotation thereof.

On the shaft piece 26, an L-shaped support member 29 fixed to the upper surface of both ends of a movable guide plate 28 disposed along the front and rear of the sanding roll 17 is rotatably supported by a shaft 30. be done. In addition, the shaft piece 26 and the support member 2
A spring 31 is sealed between the lower back surfaces of the movable guide plate 9, and the movable guide plate 28 at the right position in the figure is biased clockwise, and the movable guide plate 28 at the left position is biased counterclockwise. has been done. Furthermore, a rotary cylinder 32 is disposed on the back of the upper end of the support member 29, and the opening 7 door 3 is in a contracted state.
The support member 2
The tops of 9 are in contact with each other due to the biasing action described above. In this state, the movable guide plate 28 is held in a position parallel to the material feeding table 6, with its tip end close to the lower peripheral surface of the sanding roll 17. This movable guide plate 2
The step between the guide surface 8 and the lower edge of the endless sanding belt 18 defines the amount of grinding by the belt 18, and this amount of grinding can be adjusted by rotating the adjustment screw 27.

When the rotating cylinder 32 is driven to extend, the movable guide plate 28 rotates about the shaft 30, and the movable guide plate 28
The tip of the endless sanding belt is lowered from the circumferential surface of the sanding roll 17 to the material feeding table 6 side, and at this position, the endless sanding belt is stripped for one day.

Next, the configuration of the pressure receiving control device 7 according to the main part of the present invention will be explained as follows.
I will explain the diagram in detail.

A protruding groove 40 is formed in the material feeding table 6 directly below the sanding roll 17. A press receiving portion 42 that is swingably supported by a support shaft 41 is housed within the #recording material frame 5 . The pressure receiving portion 42 spreads in a fan shape from the pivot portion of the support shaft 41 toward the material feeding table 6 side, and
Its upper end is a flat pressure receiving surface 43. In this top part, the left side surface 44 in the figure is perpendicular to the pressure receiving surface 43 from the pivot point of the support shaft 41, the right side surface 45 is expanded with respect to the left side surface 44, and the corner between the right side surface 45 and the pressure receiving surface 43 is formed. There is a contact surface 46 on the part.
is formed.

Further, a fan-shaped gear 48 is connected to the lower surface of the pivot portion of the support shaft 41 of the pressure receiving portion 42, and a rack 51 is connected to a rod of a cylinder 50 supported within the material feeding frame 5.
It is connected with. Then, the fan gear 48. Cylinder 50. In the rack 51, the drive device 2t54 of the pressure receiving part 42
It consists of

With such a configuration, when the cylinder 50 is driven and the load 2 is extended, the rack 51 and the fan-shaped shaft 48
The press receiving part 42 rotates clockwise in the drawing due to the meshing drive of the parts, and as shown by the chain line in FIG. is retained. In the bending position, the pressure receiving surface 43 is in a retracted position lower than the material feeding table 6.

Further, when the rod of the cylinder 50 contracts, the press receiving part 42 rotates counterclockwise due to the meshing drive of the rack 51 and the sector gear 48, and its left side surface 44 hits the abutting surface 40b of the protruding groove 40 and is vertical. Stop at the position where . In this position, the pressure receiving surface 43 is in a pressure receiving position that coincides with the material feeding table 6 and becomes a part of the material feeding table 6.

In this way, the pressure receiving control device 7 is composed of the pressure receiving section 42 and the driving device 2154.

The drive control of the cylinder 50 is performed based on the detection of the workpiece W by a detector S such as an optical sensor attached to the vertical frame 15, as indicated by the second unique position.

The operation of the above embodiment will be explained.

With the pressure-receiving surface 43 in the retracted position (the position indicated by the chain line in FIG. 2), turn the lifting screw to lower the material feeding frame 5 A, and then adjust the positional relationship between the material feeding table 6 and the sanding roll 17. is determined in accordance with the thickness of the processed material W to be supplied.

In this case, if the workpiece W is an extremely thin material, the sanding roll 17 is made of a rubber roll, so in order to apply the required cutting pressure to the workpiece W, the sanding roll 17 is made of a rubber roll.
Unlike the state shown in the figure, the circumferential surface of the sanding roll 17 is set to be below the table surface of the material feeding table 6 via the sanding belt 18.

Next, the sanding belt 18 is driven. In this state, the pressure receiving surface 43 of the pressure receiving part 42 is below the table surface of the material feeding table 6, so the sanding belt 18
and the pressure receiving surface 43 are not in contact with each other.

When the workpiece W is fed onto the material feeding table 6 and its front end is positioned directly below the detector S, the detector S senses the reflected light, automatically detects the workpiece, and uses the detection signal to detect the workpiece. Based on this, the cylinder 50 is driven, and the pressure receiving surface 43 of the pressure receiving part 42 is converted from the retracted position to the pressure receiving position.

The workpiece W receives material feeding force from the drive rollers 8a and 8b, travels on the material feeding table 6 with its upper surface in contact with the movable guide plate 28, and is pinched between the pressure receiving part 42 and the endless sanding belt 18. and then subjected to grinding.

Further, when the detector S detects the passage of the rear end of the workpiece W, a timer etc. is activated in accordance with the detection, and in synchronization with the passage of the rear end of the workpiece from a position directly below the sanding roll 17, the timer is activated. When the set time expires, the cylinder 50 is switched and the pressure receiving surface 43 is converted from the pressure receiving position to the retracted position.

Thus, the workpiece W can be ground through this process.

Incidentally, the drive control of the cylinder 50 may be manually switched so that the pressure receiving portion 42 is changed to the pressure receiving position when the workpiece W is traveling.

3 and 4 show a modification of the above embodiment.

Here, in FIG. 3, an idling roll 61 is supported by a shaft 60 on the upper part of the pressure receiving part 42, and the peripheral surface of the idling roll 61 is used as a pressure receiving surface. In this configuration, the shaft 60 is displaced to the right position in the figure with respect to the support shaft 41.

In the above configuration, when the pressure receiving part 42 rotates clockwise to the position indicated by the chain line, the uppermost edge of the idle roll 61 becomes below the table surface of the material feeding table 6, and the pressure receiving part 42 is rotated in the figure. When the roller rotates counterclockwise and reaches the solid line position in FIG. 3, the upper edge of the idler roll 61 coincides with the table surface of the material feeding table 6.

In FIG. 4, the pressure-receiving surface is composed of an arcuate circumferential surface 63, and the center of the arcuate circumferential surface 63 is deviated from the support shaft 41 to the right in the figure, and the chain line shows the arcuate circumferential surface. The top of 63 should be below the material feeding table 6.

In addition, as the converting device of the present invention, the pressure receiving portion 42
It may be a cylinder whose rod end is directly connected to the cylinder through a long hole, etc. Furthermore, the eccentric wheel and the pressure receiving surface 43 may be connected by a link, or the support shaft 41 fixed to the pressure receiving part 42 may be connected. Various configurations may be provided, such as rotating with a reversible motor.

Further, in the above embodiment, the present invention is applied to a top surface grinding type, but the vertical positional relationship between the material feeding table 6 and the sanding roll 17 is changed, so that the grinding part such as the sanding roll 17 is placed in the material feeding path. The present invention may be applied to a lower surface grinding type.

<Effects of the Invention> As described above, in the present invention, the pressure receiving surface formed on the pressure receiving part forms a part of the material feeding table 6 when the workpiece W is fed, and in other cases. Since it is retracted from the material feeding table 6, even if an extremely thin processed material W is applied and the sanding roll is brought close to the material feeding table 6, the endless sanding belt will not damage the material feeding table 6. or shorten the life of the endless sanding belt itself. Therefore, there is an excellent effect that it is possible to apply an extremely thin processed material W.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the sander 1, with FIG. 1 being a partially cutaway side view of the belt sander, and FIG. 2 being an enlarged vertical sectional side view of the main parts. Moreover, FIGS. 3 and 4 are enlarged longitudinal sectional side views of main parts showing a modification thereof. 5; Material feeding frame 6; Material feeding table 7; Pressure control device 8a, 8b; Drive roller 17; Sanding roll 18; Endless sanding belt 40; Other groove 4
1; Support shaft 42; Pressure receiving part 43; Pressure receiving surface 48; Fan-shaped gear 50 Niji cylinder 51; Rack 54; Drive device 6
1; Idle roll 63; Arc-shaped circumferential surface % 1 Figure 3, Figure 4, Senshi Urine Ichishofu 2, May 25, 1988

Claims (1)

[Scope of Claims] 1) An endless sanding belt is passed over a group of grinding rolls including a sanding roll that is disposed opposite to a material feeding table with a material feeding path, and the belt is run, and further A guide surface is arranged to face the material feeding table via the material feeding path, and a material feeding drive roll is exposed from the material feeding table, and the driving roll applies material feeding force to the workpiece. In the belt sander machine, the belt sander is configured to run the workpiece while pressing the workpiece against a guide surface. , a pressure receiving control device comprising a drive device that swings and converts the pressure receiving surface of the pressure receiving part into a pressure receiving position forming a part of the material feeding table and a retracted position retracting from the material feeding table, is installed on the material feeding frame. A belt sander machine characterized by being installed in a part facing the sanding roll.