JPH0716867B2 - Belt sander pad pressure pad device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention is to grind and polish a surface of a metal material, wood, or the like, and the polishing belt is stretched over a plurality of rolls and the inner surface of the polishing belt is used. The present invention relates to a treading pad device for a belt sander machine, in which a polishing head having a treading pad device installed therein is provided in opposition to a material feeding passage so that the polishing belt travels in a direction intersecting the material feeding passage.

<Prior Art> In a belt sander of this type, a treading pad device is disposed on the inner surface of the polishing belt facing the material feeding passage, and the treading pad device of the treading pad device runs below the treading plate. The work material is pressed into contact with the work material and ground and polished.

<Problems to be Solved by the Invention> In the conventional tread pad device, the tread plate is a Japanese Patent Publication No.
It is a fixed type as disclosed in No. 21543 and the like.

In this structure, if the contact portion b of the tread plate a is inclined with respect to the polishing belt c as shown in FIG. 9, in this case, the width of the contact portion b through which the processed material passes. Only the portion of x contributes to the pressing of the polishing belt c to the processed material. Therefore, the band of the polishing belt c that rubs the portion of the width x becomes the effective width y. However, when a narrow workpiece w is supplied as shown in the figure, the effective width y becomes considerably narrower than the width z of the polishing belt c. For this reason, the entire surface of the belt is not effectively used, and as a result, wear and clogging of the band of the effective width y are accelerated, and the polished surface of the processed material w is easily deteriorated. Further, it is necessary to advance the replacement time of the polishing belt c.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned conventional drawbacks and provide a tread pad device for a belt sander machine that can effectively utilize a polishing belt.

<Means for Solving the Problems> In the present invention, the polishing belt feeds a polishing head formed by arranging a polishing belt on a plurality of rolls and disposing a tread pad device on the inner surface of the polishing belt. In a belt sander machine that is installed in opposition to the material feeding passage so that it runs in a direction intersecting the passage, a rotatable long tread with a narrow elongated contact portion on which the polishing belt makes sliding contact is formed on the lower surface. A plate and a holding mechanism for setting and holding the inclination angle of the elongated contact portion with respect to the running direction of the polishing belt are provided.

In such a configuration, the holding mechanism includes one of a plurality of vertical positioning grooves formed on the peripheral surface of the tread plate, a locking shelf for locking the tread plate at a predetermined position, and the tread plate. It may be composed of a guide protrusion that slidably fits into the positioning groove, and an elastic contact means that biases the tread plate toward the locking shelf.

<Operation> By rotating the tread plate a, the narrow elongate contact part b
Can have a desired inclination angle with respect to the traveling direction of the polishing belt c.

Therefore, in the case of applying the narrow work material w ₁ as shown by the solid line in FIG. 8, the inclination angle of the contact portion b with respect to the polishing belt c is increased. When applying a wide processed material w ₂ ,
The inclination angle with respect to the polishing belt c is reduced as indicated by the chain line in the figure.

Thus, even if the width of the processed material w is variously applied, the effective width y of the polishing belt c can be approximated to the width z of the polishing belt c, and the polishing surface of the belt c can be used without waste. become.

Further, in the case where the holding mechanism including the elastic contacting means for urging the treading plate toward the locking shelf is applied, when excessive pressure is applied to the lower surface of the treading plate, elastic contacting means such as a spring is applied. The tread plate is lifted up against the instability and the engagement with the locking rack is released, and no mechanical stress is generated on the tread plate side. Further, since the guide protrusion is fitted into the positioning groove of the tread plate during this ascent, the guide action ensures a stable lift without rotation.

<Example> An example of a belt sander according to the present invention will be described with reference to Figs.

A material feeding frame 2 is mounted on one side of the base frame 1, and in the material feeding frame 2, a material feeding belt 5 is hung on a driving roll 3 and a driven roll 4 pivotally supported in the front and rear direction. Then, a material feeding device whose upper surface serves as a material feeding passage is provided. As the material feeding belt 5, a sanding belt is used so as not to slip with the processed material w.

In addition, on the material feeding frame 2, the supporting guides 6a and 6b are processed materials w.
Are arranged at intervals equal to the width of.

Further, a vertical frame 7 is erected on the other side of the base frame 1, and two front and rear polishing heads 8a, 8b are attached to the vertical frame 7.

The polishing heads 8a, 8b are fitted in a vertical elevating guide 9 formed on the inner surface of the vertical frame 7 and can be moved up and down by an elevating handle 10. Then, the driving roll 13 and the driven roll 14 are respectively supported in the front-rear direction, and the tension rolls 12 are arranged in a triangular shape at the uppermost position, the polishing belt 15 is stretched over each of the rolls 12 to 14, and further the grinding motor 16 By transmitting the driving force to the driving roll 13, the polishing belt 15 is caused to travel in the clockwise direction in FIG. 1 which intersects the material feeding passage.

A tread pad device 17 according to the present invention which is inscribed in the polishing belt 15 is disposed between the rolls 13 and 14. This tread pad device 17 will be described in detail with reference to FIGS.

Reference numeral 18 denotes a pad frame fixed to the vertical frame 7, and a cover plate 20 is fixed to the upper surface of the tubular frame 19, and the inner diameter of the circular opening 21 on the lower surface thereof is made smaller than the inner diameter of the tubular frame 19. Locking shelves 22 are formed on the periphery of the circular opening 21.

A circular tread plate 25 is arranged in the circular opening 21, and a locking collar 26 formed on the periphery of the circular pressing plate 25 is hung on the locking shelf 22.
The bottom surface is exposed. A contact strip 27 is fixed to the lower surface of the tread plate 25 through its center in the radial direction, and the lower surface serves as a long contact portion 28. Further, the locking collar 26
As shown in FIG. 4, there are positioning grooves 29 at equal angular intervals.
Are formed in plural.

A spring seat 30 is suspended in the pad frame 18 at the center of the cover plate 20. The spring seat 30 is supported by a screw rod 31 screwed into the central portion of the cover plate 20 so that the vertical position can be adjusted. The screw rod 31 is held by a nut 32 screwed to the upper portion of the lid plate 20. Further, a coil spring 35 is externally fitted to the lower peripheral surface of the spring seat 30, and the lower end thereof is elastically contacted with the upper surface of the tread plate 25 so that the locking flange 26 of the tread plate 25 is pressed against the locking shelf 22. There is.
The coil spring 35 constitutes an example of elastic contact means.

Further, an insertion hole 36 is formed in the tubular frame 19 at the peripheral position of the locking collar 26, a rotation stopper 37 is inserted into the insertion hole 36, and a locking protrusion 38 at the tip thereof is provided with the positioning groove 29. And the contact portion 28 of the contact strip 27 is fixed at a desired angular position with respect to the running direction of the polishing belt 15.

The rotation stopper 37 is pressed against a push screw 39 screwed into a screw hole formed in the lower surface of the tubular frame 19 to hold its position.

In this configuration, the positioning groove 29 of the locking collar 26 and the rotation stopper 37 constitute a holding mechanism for the tread plate 25.

The operation of the above embodiment will be described. When the processed material w is sent to the material feeding device and comes to the lower part of the tread plate 25, the polishing belt 15 running in the transverse direction is pressed against the lower surface of the contact portion 28 of the tread plate 25 to perform a predetermined amount of grinding and polishing. Is applied.

If the thickness of the workpiece w supplied at this time is larger than a predetermined thickness or if the upper surface of the workpiece w is an irregular surface having irregularities, an excessive pressure is generated on the lower surface of the contact portion 28 as a reaction of the grinding and polishing. At this time, the tread plate 25 slightly floats against the biasing force of the coil spring 35. Therefore, the tread plate 25 is not overpowered. Further, due to the guiding action of the guide protrusion 38 and the positioning groove 29, the lower surface of the tread plate 25 floats in parallel, the contact part 28 does not rotate, and a uniform treading action is maintained.

When the excessive pressure is released, the locking collar 26 returns to the position where it is locked by the locking rack 22 by the biasing force of the coil spring 35.

Thus, the processed material w has its upper surface favorably ground and polished by the polishing heads 8a and 8b by the polishing belt 15 below the tread plate 25 of the tread pad device 17.

As another example of the elastic contact means, an air cylinder or the like may be used instead of the coil spring 35. Further, the inside of the pad frame 18 may be used as an air chamber, and the pressurized air may act on the upper surface of the tread plate 25.

In the above embodiment, when changing the width of the processed material w, in order to correspond to the width of the applied processed material w, the rotation stopper 37 is first retracted and then the tread plate 25 is rotated to a predetermined angle. The rotation stopper 37 is fitted into the corresponding positioning groove 29 to hold the position.

The predetermined angle of the contact strip 27 is, as shown in FIG. 8, an intersection point o, o between the side end s, s (width x) of the processed material w and the side end of the contact portion 28.
The width y of the polishing belt 15 is substantially equal to the width z of the polishing belt 15. And thereby, almost the entire width of the polishing belt 15 contributes to the polishing process, the polishing surface is effectively used,
The clogging speed becomes slower, the clogging is relatively prevented, the polished surface becomes beautiful, and the life of the aspect becomes longer.

5 to 7 show another embodiment of a holding mechanism for holding the contact portion 28 at a predetermined angle with respect to the running direction of the polishing belt.

Here, FIG. 5 shows a front end surface of a guide cylinder 44 in which a locking piece 41 is fixed to the tip of the rotation stopper 40 and is fitted into an insertion hole 42 of the tubular frame 19 to slidably insert the rotation stopper 40. Between the locking piece 41 and
45 is provided, and the locking projection 46 at the tip of the locking piece 41 is positioned in the positioning groove.
It was designed to fit in 47.

In this configuration, the rotation stopper 40 is pulled against the spring 45 by using the knob 48 provided at the outer end of the rotation stopper 40 to remove the locking protrusion 46 from the positioning groove 47 and rotate the tread plate 25. After moving the contact strip 27 to set the contact portion 28 to the required angle, the rotation stop 40
The locking projection 46 is fitted into the predetermined positioning groove 47 by releasing the. Therefore, there is an advantage that the rotation stopper 40 can be easily removed and held.

FIG. 6 shows that the ratchet 50 serving as a positioning groove is formed in the locking brim 26 of the tread plate 25, and the guide projection 53 is biased in the projecting direction by the spring 52 in the insertion hole 51 of the tubular frame 19. It is arranged so that its end is fitted into one of the grooves of the ratchet 50. In such a configuration, the tread plate 25 is held by the elastic contact of the guide protrusion 53, and the tread plate 25 is held.
25, the guide protrusion 53 retracts against the spring 52, and the ratchet
By applying a rotating force that can exceed 50 mountains, the contact part
28 angle selections and position retentions can be made.

In FIG. 7, the tread plate 25 can be automatically rotated. That is, the gear 60 is engraved on the locking brim 26 of the tread plate 25, and the tubular frame 19 is partially lacking.
A small gear that fixes the drive motor 61 and is fixed to its drive shaft.
It is possible to position the contact portion 28 at a predetermined angle by engaging 62 with the gear 60 and controlling the drive time of the drive motor 61. With such a configuration, there is an advantage that a manual rotation operation of the tread plate 25 is unnecessary and a minute angle can be selected by reducing the pitch of the gear 60.

In each of the above-described embodiments, the contact portion 28 is formed by providing the contact strip 27 on the tread plate 25, integrally forming a long convex surface on the lower surface of the tread plate 25, or raising the linear protruding edge. It can also be formed by, for example.

<Effects of the Invention> As described above, according to the present invention, the contact portion 28 is provided on the lower surface of the tread plate 25.
Since it is possible to effectively use almost the entire width of the polishing belt 15 by changing the angle of the contact portion 28 in accordance with the width of the processed material w, the size of the polishing surface of the polishing belt 15 can be effectively reduced. The clogging rate can be reduced, a beautifully polished surface can be achieved, and the life of the embodiment can be lengthened.

Further, in the configuration in which the guide protrusion is slidably fitted in the positioning groove of the tread plate 25, and the holding mechanism adapted to act the biasing force of the elastic contact means on the tread plate is supplied. Even if excessive pressure is applied to the tread plate 25 because the thickness of the processed material w is more than a predetermined value or the processed surface is uneven,
There is an effect that the stepping plate 25 does not retreat, the processed material w cannot run and the mechanical stress strain is not applied to each frame, and that it is possible to perform reasonably grinding and polishing.

[Brief description of drawings]

FIG. 1 is a front view of a belt sander machine, FIG. 2 is a side view of the same, and FIG. 3 is a longitudinal sectional front view of essential parts showing lower parts of polishing heads 8a and 8b. Figure 4 is the third
It is a sectional view taken along the line AA of FIG. Further, FIG. 5 is a cross-sectional plan view of an essential part of the second embodiment, FIG. 6 is a cross-sectional plan view of the third embodiment, and FIG. 7 is a vertical cross-sectional side view of the fourth embodiment. Furthermore, FIG. 8 is a principle diagram, and FIG. 9 is a principle diagram showing conventional problems. 2; material feeding frame, 5; material feeding belt, 8a, 8b; polishing head, 1
5; polishing belt, 17; tread pad device, 18; pad frame, 25; tread plate, 27; contact strip, 28; contact portion, 29; positioning groove, 35; coil spring, 37; rotation stop, 50; ratchet, 53;
Guide protrusion, 60; gear, 61; drive motor

Claims (2)

[Claims] 1. A polishing belt is stretched over a plurality of rolls,
Further, in a belt sander machine in which a polishing head having a pedaling pad device provided on the inner surface of the polishing belt is provided in opposition to the material feeding passage so that the polishing belt travels in a direction intersecting the material feeding passage. A rotatable tread plate having a narrow elongate contact portion on the lower surface with which the polishing belt slides, and a holding member for setting and holding an inclination angle of the elongate contact portion with respect to the running direction of the polishing belt. A tread pad device for a belt sander, which is equipped with a mechanism. 2. A vertical positioning groove having a plurality of the holding mechanisms formed on the peripheral surface of the tread plate, a locking shelf for locking the tread plate at a predetermined position, and one of the tread plates. 2. The tread pad device for a belt sander machine according to claim 1, wherein the tread pad is slidably fitted in the positioning groove, and a resilient contact means for urging the tread plate toward the locking shelf. .