JPH0529663U - Belt sander - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to adjust the grinding conditions according to the thickness and shape of the workpiece. [Structure] Upper roll 54 and lower rolls 55a, 5
A sanding belt 56 is stretched over 5b, and a pad 57 is provided between the lower rolls 55a and 55b. A support roll 15 is provided below the pad 57 at a position corresponding to the pad 57, and guide rolls 16 are provided before and after the support roll 15. Of the rolls, the support roll 15 provided below the pad 57 at a position corresponding thereto is attached to the side frame 13 so as to be movable in the work transfer direction. As a result, the support roll 1 can be used according to the thickness and shape of the workpiece.
The position of 5 is adjusted to change the grinding conditions.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a belt sander having an improved structure for supporting a work being ground.

[0002]

[Prior Art]

 As a belt sander used for grinding woodwork materials, resin materials, etc., for example, the following configurations are known.

An endless sanding belt is laid between rolls on the upper part of the main frame, and this is driven by a drive motor. On the other hand, in the lower part of the main frame, a plurality of guide rolls are arranged side by side, and a material feeding belt extends laterally and is stretched, and the work placed on this is fed so as to pass below the sanding belt. .. Then, a pad is provided on the back side of the sanding belt so that the sanding belt is pressed against the work on the feeding belt, and a supporting roll is provided on the back side of the feeding belt at a position corresponding to the pad. ..

The support roll and the guide roll are provided so as to be movable up and down with respect to the main frame, and their pivots are supported by springs, so that even if a work having a slightly different thickness dimension is fed, The expansion and contraction absorbs the dimensional difference.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned structure, even if the support roll is movable in the vertical direction, the support roll is fixed in the conveying direction, so that the following problems occur.

That is, it is assumed that the dimension D between the material feeding belt 1 and the sanding belt 2 is set as shown in FIG. 10 (A). In this case, when the work W is placed on the material feeding belt 1 and conveyed in the direction of the arrow A, and the tip of the work W reaches the vertical plane X 1 passing through the axis of the support roll 3, the top end of the work W is sanded. It comes into contact with No. 2 and grinding is started.

However, as shown in FIG. 10B, when the dimension setting d between the belts 1 and 2 is relatively narrow with respect to the thickness dimension of the work W, the tip of the work W is vertical. Before reaching the surface X, the tip of the upper surface of the work W is rubbed by the sanding belt 2 and the grinding is started. This means that the tip ridge of the work W is excessively ground, so that a so-called "edge sag" phenomenon occurs and the grinding quality is deteriorated.

In such a case, it is conceivable to readjust the dimension setting between the material feeding belt 1 and the sanding belt 2, but it is a constraint of other grinding conditions such as obtaining a necessary “shaving margin”. It can be difficult.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to set various grinding conditions in accordance with the size and shape of a work, thereby improving the grinding quality. There is a belt sander that can be used.

[0010]

[Means for Solving the Problems]

 The belt sander of the present invention is an endless sanding belt that is run by being stretched between a plurality of rolls, a feeding belt that feeds the work to be ground into the grinding area by the sanding belt, and a backside of the sanding belt. A treading member that is provided to press the sanding belt against the workpiece fed by the material feeding belt, and a support roller that is provided at a position corresponding to the treading member and is in contact with the back surface of the material feeding belt. It is characterized in that it is provided with a position adjusting mechanism for mounting the supporting roll so that the position thereof can be adjusted along the conveyance direction of the work.

[0011]

The work is fed into the grinding area by the sanding belt by the material feeding belt and is ground at the position where it is sandwiched between the treading member and the supporting roll.

Here, if the position of the support roll is adjusted along the conveyance direction of the work, the grinding condition changes because the grinding surface of the work hits the sanding belt at different angles and positions.

[0013]

[Effect of the device]

 As described above, in the belt sander of the present invention, since the position of the supporting roll can be adjusted along the conveying direction of the work, the grinding condition can be changed according to, for example, the size or shape of the work. It has the excellent effect of being able to improve quality.

[0014]

【Example】

 An embodiment embodying the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, the overall structure includes a work transfer mechanism 10 and a sanding mechanism 50 provided above the work transfer mechanism 10. The work transfer mechanism 10 is provided with a material feeding belt 11 extending in the left-right direction in FIG.

<Sanding Mechanism> First, the sanding mechanism 50 will be described. It is provided so as to straddle the material feeding belt 11 above the work transfer mechanism 10 by four support posts 51, and is entirely covered by a protective cover 52. By rotating the operation handle 53, the sanding mechanism 50 can be moved to a desired height along the support post 51.

An upper roll 54 and two lower rolls 55a and 55b are provided inside the protective cover 52, and an endless sanding belt 56 is stretched between them. The sanding belt 56 is driven by a motor (not shown) and travels in the direction of arrow B, which is the opposite direction to the traveling direction of the material feeding belt 11 (direction of arrow A in the figure).

A pad 57, which is a stepping member, is provided between the two lower rolls 55a and 55b. It is located on the back side of the sanding belt 56 and has a function of urging the sanding belt 56 downward.

Two pressing rolls 58a, 58b, 59a, 59b are provided on both left and right sides of the lower rolls 55a, 55b, and although not shown, their pivots are supported so as to be vertically movable. It is biased downward by the compression coil spring.

An air intake duct of a dust collector (not shown) is provided in the protective cover 52 of the sanding mechanism 50 so that the dust of the workpiece generated during grinding is sucked together with air. ing. An inspection door 60 is attached to the front surface of the protective cover 52 so as to be openable and closable.

<Work Conveying Device> Next, the work conveying device 10 will be described. This is a structure in which a pair of front and rear side frames 13 are fixed to the upper part of a base 12 installed on the floor, and feed rolls 14 are rotatably attached to the left and right ends of the side frame 13. The material feed belt 11 is stretched between the feed rolls 14, 14. The material feeding belt 11 is made to travel at a low speed in the direction of arrow B by a known drive mechanism provided in the base 12, and a work is placed on the upper surface of the material feeding belt 11 from the right side of the apparatus. It is designed to be fed into the grinding area below.

Between the pair of feed rolls 14 and 14, one support roll 15 and five guide rolls 16 are provided between the side frames 13. The backing roll 15 is located immediately below the pad 57. Further, three of the guide rolls 16 are located on the work entry side of the support rolls 15, and are positioned immediately below the lower roll 55b on the right side of the sanding mechanism 50 and the two pressing rolls 58b and 58a. The remaining two rolls are located on the work discharge side with respect to the support rolls 15 and are positioned corresponding to the two press rolls 59a and 59b.

The support structure for each of these rolls will be described. First, the support roll 15 will be described. As shown in FIG. 3, a bearing 18 is attached to each end of a fixed shaft 17 and a cylindrical roll main body 19 is fitted to an outer race 18a of the bearing 18. Are configured together. With this configuration, the roll main body 19 is rotatably supported on the fixed shaft 17, and the fixed shaft 17 has prisms 17a formed at both ends thereof as shown in FIG.

On the other hand, a pivot guide member 20 is attached to the side frame 13 with two bolts 21. Each of the bolt insertion holes 20a formed in the pivot guide member 20 has an oval shape that is long along the workpiece transfer direction, so that the fixed position of the pivot guide member 20 is fixed to the side frame 13 along the workpiece transfer direction. It is adjustable. A pair of guide projections 20b are provided on the lower surface of the pivot guide member 20 so as to project downward at predetermined intervals, and the prismatic portions 17a at both ends of the fixed shaft 17 are fitted between the guide projections 20b. is doing. As a result, the fixed shaft 17 and thus the support roll 15 are supported by the pivot guide member 20 so as to be vertically movable. Further, as described above, since the bolt insertion hole 20a of the pivot guide member 20 has an oval shape, the fixing position of the pivot guide member 20 is adjusted by using this, so that the mounting position of the support roll 15 is adjusted. It is possible to perform adjustment in a direction along the conveyance direction (left-right direction), which constitutes a position adjusting mechanism of the supporting roll 15.

A cylinder device 22 is provided below the pivot guide member 20 and is fixed to the lower surface of each guide projection 20b of the pivot guide member 20 by a bolt (not shown). The rod 22a of the cylinder device 22 protrudes between the guide protrusions 20b of the pivot guide member 20, and the tip of the rod 22a supports the prism portion 17a of the fixed shaft 17. Therefore, when the cylinder device 22 is operated to change the protruding amount of the rod 22a, the fixed shaft 17 and thus the support roll 15 move up and down. The cylinder device 22 receives a supply of compressed air of a constant pressure from the air compressor side (not shown), and has a function of constantly urging the rod 22a upward with a constant pressure. The air pressure supplied to the cylinder device 22 can be adjusted by a valve device (not shown), but since the specific structure for this is well known to those skilled in the art, description thereof will be omitted.

A stopper mounting member 23 is superposed on the pivot guide member 20 and is fixed to the pivot guide member 20 by two bolts 24. A screw hole 23a is formed in the center of the stopper mounting member 23, and a bolt insertion hole 20c is formed in the pivot guide member 20 at a position corresponding to the screw hole 23a. The stopper bolt 25 is screwed into the screw hole 23a of the pivot guide member 20, and the tip of the stopper bolt 25 can enter the stopper receiving hole 26 formed on the upper surface of the prismatic portion 17a of the fixed shaft 17. There is. As a result, the upper limit position of the fixed shaft 17 and thus the support roller 15 is regulated.

Since the support structure of the support roll 15 described above is the same at both ends of the fixed shaft 17, the description of the support structure at the other end is omitted.

Next, the support structure of the guide roll 16 will be described. The structure of the guide roll 16 itself is similar to that of the support roll 15 described above, and since the roll main body is fitted to the fixed shaft 31 via the bearing, detailed illustration is omitted. The support structure is as shown in FIGS. 5 and 6, and is similar to that of the support roll 15, except that the pivot guide member 32 is not adjustable in the direction along the work transfer direction (left-right direction). To do.

Specifically, the pivot guide member 32 is fixedly attached to the side frame 13 via a bolt 33, and the guide roll 16 is fixed between a pair of guide protrusions 34 formed on the lower surface thereof. The end of the shaft 31 is inserted. The end portion of the fixed shaft 31 is also received and supported by the rod 35a of the cylinder device 35. When the cylinder device 35 is operated to change the protruding amount of the rod 35a, the fixed shaft 31 and thus the guide roll 16 are moved up and down. Can be moved. Further, the cylinder device 35 also has a function of receiving the supply of compressed air of a constant pressure and constantly urging the rod 35a upward with a constant pressure. The air pressure supplied to the cylinder device 35 can be adjusted independently of the air pressure supplied to the cylinder device 22 that receives the support roll 15.

A stopper mounting member 36 is fixed on the pivot guide member 32 by a bolt 37 as shown in FIG. 5, and a stopper bolt 38 is screwed into a screw hole 36a formed therein. The tip of the stopper bolt 38 can enter into the stopper receiving hole 39 formed on the upper surface of the fixed shaft 31, and thereby the upper limit position of the fixed shaft 31 and thus the guide roll 16 can be regulated. ing.

The support structure at each end of the guide roll 16 described above is common to the left and right, and the same applies to the remaining four guide rolls 16, and therefore description thereof will be omitted.

Next, the operation of this embodiment will be described.

First, the operating handle 53 provided on the sanding mechanism 50 is operated to move the sanding mechanism 50 to a desired height. This height is determined in consideration of the thickness of the work and the necessary "cutting margin", and can be set while looking at a known gauge (not shown).

After that, the work transfer device 10 is activated, and the work to be ground is placed on the material feeding belt 11 and fed below the sanding mechanism 50. Then, first, the tip of the work reaches the position sandwiched between the guide roll 16 and the pressing rolls 58a and 58b, and when further fed, reaches the position sandwiched between the pad 57 and the support roll 15. When reaching this position, the surface of the work is rubbed by the sanding belt 56, so that the work is ground and cut by a predetermined "cutting margin". This grinding state continues until the rear end of the work comes out of the position between the pad 57 and the support roll 15, and the entire surface of the work is ground during that time.

Here, considering the state at the time of starting the grinding, the time when the grinding of the work is started differs depending on the thickness dimension of the work and the dimension between the material feeding belt 11 and the sanding belt 56. To do. That is, assuming that the distance between the material feeding belt 11 and the sanding belt 56 is appropriate for the thickness of the work, the tip of the work W is supported by the support roll 15 as shown by the solid line in FIG. Grinding of the surface of the work W is started at or immediately before the line X connecting the top and the pad 57. On the other hand, when a thick work W is fed as shown in FIG. 10B, or when the dimension between the belts 11 and 56 is narrow relative to the thickness of the work W, the work W is As compared with the case described above, the grinding by the sanding belt 56 is carried out at an earlier timing, the front end of the work W is excessively ground, and the "edge sagging" phenomenon occurs.

In view of this, in the present embodiment, when a grinding failure such as the "end sagging" phenomenon occurs, the bolts 21 fixing the pivot guide member 20 of the work transfer device 10 are loosened to pivot. It is possible to adjust the grinding conditions by moving the guide member 20 and thus the support roll 15 along the conveyance direction of the work. That is, since the work W has a large thickness dimension as described above, when the dimension setting between the belts 11 and 56 is relatively narrow with respect to the work W, as shown in FIG. If is moved toward the destination, the grinding conditions will be the same as those shown by the solid line in FIG. With this, according to the present embodiment, it is possible to obtain appropriate grinding conditions according to the thickness dimension of the work.

In the above-mentioned grinding state, a force for pressing the sanding belt 56 from the pad 57 acts on the work, and the force is received by the support roll 15 located immediately below the pad 57. Therefore, the grinding pressure acting on the work depends on the air pressure supplied to the cylinder device 22 that urges the support roll 15 upward. In the present invention, since the air pressure supplied to the cylinder device 22 is always kept constant, the grinding pressure is always constant.

Further, it is assumed that a work thinner than the standard is supplied due to variations in the work thickness. Then, in this case, the guide rolls 16 and the support rolls 15 are raised by the cylinder devices 22 and 35, and the work is ground without forming a gap between the sanding belt 56 and the work. Moreover, since the air pressure supplied to the cylinder device 22 is always maintained at a constant pressure as described above, the cylinder device 22 and thus the supporting roll 15 press the work against the sanding belt 56 at a constant pressure, thereby grinding. The pressure can be the same as the standard thickness work.

On the other hand, when a work having a thickness larger than the standard is supplied, the guide rolls 16 and the support rolls 15 are pushed by the work and move downward, so that the clearance between the sanding mechanism 50 and the guide roll 16 is lowered. The grinding is performed in a state in which Since the air pressure supplied to the cylinder device 22 is maintained at a constant value even in this case, the supporting roll 15 presses the work against the sanding belt with a constant pressure, and the grinding pressure is the same as that of the work having the standard thickness. Can be

Therefore, according to the belt sander of the present invention, the grinding pressure acting between the sanding belt 56 and the workpiece becomes constant even if the thickness of the workpiece varies, and the "shaving margin" becomes constant. Can be In addition, in order to increase the grinding pressure and increase the "shaving margin", the supply pressure to the cylinder device 22 may be adjusted to be high.

Further, in the belt sander of the present embodiment, not only the support roll 15 but also a total of five guide rolls 16 positioned in front of and behind the support roll 15 are configured to be moved up and down by the cylinder device 35. Therefore, for example, when a work thinner than the standard is sent, the guide roll 16 as well as the support roll 15 rises, and the work is sent below the sanding belt 56 while always maintaining a horizontal state without tilting. become. Therefore, if the work is fed in a state of falling to the right as shown in Fig. 7, a so-called "edge sagging" phenomenon occurs in which the ridge of the leading end in the approach direction is excessively ground by the sanding belt. However, with the belt sander of the present invention, such "edge sagging" can be reliably prevented.

As described above, according to the present embodiment, the position of the supporting roll 15 can be adjusted along the conveyance direction of the work according to the thickness dimension and shape of the work, so that the optimum grinding conditions for the work can be obtained. It is possible to improve the grinding quality.

Moreover, particularly in this embodiment, the supporting roll 15 moves up and down according to the thickness of the work and the work is constantly pressed against the sanding belt 56 by the cylinder device 22 at a predetermined pressure, so that the grinding pressure becomes constant. Therefore, it is possible to suppress the fluctuation of the "cutting margin". Further, not only the support rolls 15, but also the guide rolls 16 positioned in front of and behind the support rolls 15 move up and down similarly to the support rolls 15 and the work is always fed below the sanding belt 56 without being tilted, so that the grinding quality is further improved as a whole. To do.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following modifications are possible, for example.

(1) In the above-described embodiment, only the support roll 15 provided directly below the pad 57 is configured to be positionally adjustable in the work conveying direction. However, as shown schematically in FIG. The guide roll 16 provided directly below the lower roll 55b of the mechanism 50 may also be configured to have the same structure as the support roll 15 so that its position can be adjusted.

(2) Further, also in the belt sander of the type including the pad 57 as in the above embodiment, when the lower roll 55b functions as a stepping member and grinding is performed under the lower roll 55b, As schematically shown in FIG. 8, the guide roll 16 provided directly below the lower roll 55b may be configured to be positionally adjustable by the same structure as the support roll 15.

(3) As schematically shown in FIG. 9, a sanding belt 72 is stretched between the sanding roll 70 and the drive roll 71, and the sanding roll 70 is also used as a treading member to operate the sanding belt 72. In a so-called "drum head type" belt sander that is pressed against a work located below the sanding roll 70, the position of the supporting roll 73 provided below the sanding roll 70 can be adjusted by the same structure as the above-described embodiment. You may comprise.

(4) In the above-described embodiment, the support roll 15 and the guide roll 16 are provided so as to be movable up and down, and these are biased upward by the cylinder devices 22 and 35. Instead of the cylinder devices 22 and 35, springs may be used to urge the rollers 15 and 16 upward.

Besides, the present invention is not limited to the embodiments described above and shown in the drawings, and is applicable to, for example, a belt sander of a type in which a sanding belt is arranged on the lower surface side of a work. Various modifications can be made without departing from the above.

[Brief description of drawings]

FIG. 1 is an overall front view showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged vertical side view of a main part.

FIG. 4 is an enlarged plan view of the same.

5 is a vertical cross-sectional view taken along the line AA of FIG.

6 is a vertical cross-sectional view taken along the line BB of FIG.

FIG. 7 is a schematic front view showing another embodiment of the present invention.

FIG. 8 is a schematic front view showing another embodiment of the present invention.

FIG. 9 is a schematic front view showing another embodiment of the present invention.

FIG. 10 is a schematic enlarged front view for explaining a conventional defect.

FIG. 11 is a view corresponding to FIG. 10 for explaining the operation of the present embodiment.

[Explanation of symbols]

 10 ... Work transfer mechanism 11 ... Material feeding belt 14 ... Roll 15 ... Support roll 16 ... Guide roll 50 ... Sanding mechanism 56 ... Sanding belt 57 ... Pad (pedaling member)

Claims (1)

[Scope of utility model registration request] 1. An endless sanding belt which is stretched between a plurality of rolls and runs, a material feeding belt which feeds a work to be ground into a grinding region by the sanding belt, and a rear surface side of the sanding belt. And a treading member for pressing the sanding belt against the work sent by the material feeding belt, and a supporting roll provided at a position corresponding to the treading member and in contact with the back surface of the material feeding belt, A belt sander comprising a position adjusting mechanism for mounting the roll so that the position of the roll can be adjusted along the conveying direction of the work.