JP2000288896A - Lower surface shaving machine for workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shave a workpiece to a required finished thickness even if the workpiece has a thickness error. SOLUTION: This shaving machine has a cutting tool for grinding a lower surface of a workpiece, such as a belt sanding head 17, a rotating planer body, a plane turning cutter, or the like; and a front guide table 30a tiltably journalled in front of the cutting tool, having a front end part energized upward. When the workpiece arrives, the front end part of the front guide table 30a retracts downward according to a thickness of the workpiece to change a height difference between a machining part (x) of the belt sanding head 17 or the like and a guide face (y) of the front end part of the front guide table 30a according to the thickness of the workpiece. That is, a thick workpiece is thickly shaved, while a thin workpiece is thinly shaved. A shaving thickness of the workpiece is changed such that a finished thickness of the workpiece after the machining certainly coincides with a height of a material feed passage between a material feed face of a material feed belt 8 just under a press plate 12 and the machining part (x) of the head 17. Therefore, even if the thicknesses of the workpieces are uneven, the change of the shaving thickness absorbs the unevenness to equalize and optimally finish the thicknesses of the workpieces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower surface grinding type belt sander machine for cutting a processing material such as wood or metal material from the lower surface side, or a lower surface cutting machine such as a lower surface cutting machine.

[0002]

2. Description of the Related Art As shown in FIG. 19, a belt sanding head H for grinding a lower surface of a workpiece is provided below a material feeding passage, and a front guide table a and a rear guide table b are provided before and after the belt sanding head H. Is fixedly provided, and a material feeding device c is provided above the material feeding passage, in which a material feeding belt f is wound around a driving roll d and a driven roll e on the material feeding passage. A press roll g is disposed inside the belt f at a position directly above the belt sanding head H, and is urged downward by an elastic machine j before and after the press plate g to resiliently contact the upper surface of the workpiece. A bottom grinding type belt sander machine provided with h and i is known.

In such a configuration, when a work material is supplied to the material feeding passage, the pressing roll h which has been urged downward by the elastic machine j is removed.
While being pressed against the guide tables a and b at the front and rear, and the lower surface thereof is ground by a belt sanding head H between the two guide tables. The grinding thickness is determined by the processing part x of the belt sanding head H and the front guide table a.
Of the guide surface y (normally 1 mm or less). Here, the belt sanding head H is configured such that a contact roll wrapped around an endless sanding belt is pressed against the lower surface of the work material, and a roll grinding type in which the upper end of the contact roll is a work portion, and a front and rear side of a tread pad. There is a pad grinding type or the like in which a roll and a rear roll are provided, and an endless sanding belt is wound around these members and the guide drive roll, and the upper end of the tread pad is used as a processing portion.

[0004]

By the way, there is a variation in the thickness of the processing material.
The work material is urged downward by the pressing rolls h and i, travels while pressing the lower surface against the fixed front guide table a, and as described above, the belt sanding head H
Is forcibly ground only by the difference between the processed part x and the upper surface y of the front guide table a, and the amount of grinding is constant. Therefore, both thick and thin processed materials are cut by the same amount. The thickness error of the material remains as it is, and the thickness cannot be corrected.

[0005] As a result, a work material that is too thin is forcibly ground by a predetermined thickness, so that not only the thickness error is not corrected, but also when the upper surface finish grinding is performed in a later process, the material feeding passage is not removed. Because the thickness is smaller than the height, the top surface is not ground or unevenness occurs, and the overall finish deteriorates, or the work material that is too thick bites between the pressing plate g and the front guide table a near the grinding portion. In some cases, running becomes impossible.

The error of the work material is actually 0.5 m
m or less, and is absorbed by a change in the thickness compression amount of the material feeding belt. In the case of a thin processed material, there is no problem in the material feeding itself except in extreme cases. In other words, the above-mentioned problem is a problem that arises when the aim is to achieve high finishing accuracy.

This problem applies not only to the lower surface grinding type belt sander but also to the lower surface cutting machine which cuts the lower surface of the work material using a rotary plane cylinder, a plane turning cutter or the like. An object of the present invention is to provide a lower surface grinding machine for a work material that can be ground to a required finish thickness even if there is a thickness error of the work material, and an object of the present invention is to eliminate the above-described problems of the conventional configuration. Is what you do.

[0008]

According to the present invention, a belt sanding head for grinding a lower surface of a workpiece is provided below the above-mentioned material feeding passage, and a front guide table is provided at a front portion of the belt sanding head. At the upper part of the material feeding passage, a material feeding device is provided in which a material feeding belt is stretched over a driving roll and a driven roll on the material feeding passage, and inside the material feeding belt,
A pressing plate is disposed at least immediately above a processing portion of the belt sanding head and a front end portion of the front guide table, and a processing material which is a bottom grinding type belt sander machine including a pressing roll before and after the pressing plate. In a lower surface milling machine, a front guide table is pivotally supported so as to be tiltable, and an end of the belt sanding head facing a processing portion is urged upward by an elastic machine.

The present invention is similarly applied to a lower surface cutting machine. That is, according to the present invention, a cutting tool such as a rotary plane cylinder or a plane turning cutter for cutting a lower surface of a work material is provided at a lower portion of a material feeding passage, and a front guide table is provided at a front portion of the cutting tool. At the upper part of the passage, there is provided a material feeding device in which a material feeding belt is stretched over a driving roll and a driven roll on the material feeding passage, and at least a processing part of a cutting tool and a front guide are provided inside the material feeding belt. A press plate is disposed just above the tip of the table, and in a lower surface cutting machine of a work material which is a lower surface cutting tool having a press roll before and after the press plate, the front guide table can be tilted. It is characterized in that it is supported by a shaft and its tip end facing the cutting tool is urged upward by an elastic machine. Here, cutting tools include
In addition to a rotary cutting tool such as a rotary plane cylinder and a plane turning cutter, a fixed cutting tool having a cutting blade fixed to a plane machine is also included.

In this configuration, when the work material arrives between the pressing plate and the front guide table, the front end of the front guide table which is urged upward by the elastic machine is pressed against the work material and tilts downward. The tip retreats downward. This retreat amount depends on the thickness of the work material, and the distance between the material feed surface of the material feed table immediately below the pressing plate and the guide surface at the front end of the front guide table matches the thickness of the work material. For this reason, the drop between the processing portion of the belt sanding head or the cutting tool that defines the grinding thickness of the processing material and the guide surface y at the tip of the front guide table varies depending on the thickness of the processing material, and the processing material becomes thicker. If the work material is thin, it will be cut thin. That is, the thickness of the processed material after grinding or cutting is equal to the height of the material feeding passage between the pressing plate and the processed portion. Thus, even if there is a variation in the thickness of the work material, it is corrected by changing the grinding thickness or the cutting thickness, and the thickness becomes equal.

Here, the front guide table is constituted by arranging a plurality of divided guide tables in a direction orthogonal to the material feeding direction, and each divided guide table is pivotally supported so as to be tiltable, and its belt sanding head is provided. Alternatively, the distal end portion of the cutting tool facing the processing portion may be urged upward by an elastic machine.

As described above, when the front guide table is constituted by arranging a plurality of divided guide tables in a direction orthogonal to the material feeding direction, for example, a plurality of narrow width processing materials are juxtaposed. When the divided guide tables are simultaneously supplied to the supply passages, the divided guide tables are tilted corresponding to the respective workpieces, so that even if the respective workpieces are simultaneously supplied, the workpieces are cut to a predetermined thickness. Further, even when the thickness of the work material varies in the width direction, the work material can be easily followed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A basic configuration of a bottom grinding type belt sander to which the present invention is applied, which is an example of a bottom grinding machine for a workpiece, will be described with reference to FIGS. Here, on the lower frame 1, the upper frame 3 is supported by elevating guide columns 2, 2 via a material feeding passage 11. The upper frame 3 is controlled to move up and down along the lift guide columns 2 by rotating a lift handle 5 provided on the side surface thereof.

At the lower part of the upper frame 3, there is provided a material feeding device 9 comprising a left and right driving roller 6 and a driven roller 7 with a material feeding belt 8 wound thereon. The driving roller 6 is driven by a (not shown), and the material feeding belt 8 is run. In addition, the feeding belt 8
A pressing plate 12 is provided on the inner surface of the material feeding passage at least over the processing portion x of the belt sanding head 17 and immediately above the tip of the front guide table 30a.
A plurality of front pressing rolls 13a are provided in front of the pressing plate 12.
However, a plurality of rear pressing rolls 13b are arranged rearward along the running direction of the material feeding belt 8. The rear pressing roll 13b is urged downward by the elastic machine 14 and idles. On the other hand, the front pressing roll 13a idles so that it cannot move vertically.

The lower frame 1 is provided with a belt sanding head 17 having a sanding belt 20 stretched over an upper contact roll 18 and a lower drive guide roll 19. The processing portion x located at the top end of the contact roll 18 faces the material feeding passage 11.

Further, a front guide table 30a, a traveling guide roll 22, and a preceding material table 24, which are essential parts of the present invention, are sequentially disposed in front of the belt sanding head 17 on the lower frame 1. You. The front guide table 30a, the traveling guide roll 22, and the front material table 2
4 is mounted on the front guide frame 10a (see FIG. 1),
Elevation control can be performed integrally. By this elevating,
The support height of the front guide table 30a can be adjusted.

Further, behind the belt sanding head 17, a rear guide table 26, a traveling guide roll 25,
A post-feeding table 27 is sequentially arranged. The traveling guide roll 22 is urged upward by a bullet 23. The rear guide table 26, the traveling guide roll 25, and the rear feed material table 27 also include the rear guide frame 10b (see FIG. 1).
, And can be lifted and lowered integrally.

In addition, an intermediate guide table 13 is appropriately provided between the respective run guide rolls 22 and 25 to ensure smooth running of the workpiece. Furthermore, the post-feeding material table 2
Immediately before 7, a roll brush 29 for removing grinding powder attached to the lower surface of the work material is supported.

At the entrance of the material feeding passage 11, a dial gauge 16 (see FIG. 3) is provided on the upper frame 3 so as to be opposed to the preceding material feeding table 24 at an upper position. By lowering the upper frame 3 and bringing the detection end of the dial gauge 16 into contact with the upper surface of the workpiece,
The height position of the upper frame 3 can be adjusted.

Here, the pressing plate 12 is provided over the front end of the front guide table 30a and the rear end of the rear guide table 26. The upper surface position of the belt sanding head is defined to stably secure the later-described grinding processing, and the finished thickness is accurately defined between the processing portion x of the belt sanding head 17 and the lower surface of the pressing plate 12.

In addition, a hopper 42 (see FIG. 7) is provided below the front guide table 30a to collect grinding chips shaved at the processing portion x of the sanding belt 20.

A front guide table 3 according to one embodiment of the present invention.
0a, and the structure of the front guide table 30a will be described with reference to FIGS. In front of the contact roll 18, the front guide frame 1
Supporting pieces 31 are fixed to both sides of the left and right side plates 0a. On the other hand, the side plates are provided with support shafts 32, 32 projecting inward at positions directly below the support pieces 31, 31, respectively. As shown in FIG. 6, the support shafts 32, 32
The outer end protruding outward from the side plate a is fixedly supported by a fixed metal 38 screwed to the outer surface of the side plate.
Rotating pieces 33, 33 are tiltably supported on the support shafts 32, and the front guide table 30 is mounted on the rotating pieces 33, 33.
a is delivered and fixed. For this reason, the front guidance table 3
Oa is tiltably supported by the support shafts 32, 32 via the rotating pieces 33, 33.

The front end of the front guide table 30a has a beak shape on the contact roll 18 side. The rotating piece 33,
A hole 34 is formed at the rear end of the support piece 33,
1. A spring piece 36 supported by a screw 35 so that the height can be adjusted.
Is inserted into the hole 34 from above, and a spring 37 having a spring is mounted between the spring piece 36 and the inner bottom surface of the hole 34, and the rear ends of the rotating pieces 33, 33 are urged downward. Thus, the beak-shaped tip of the front guide table 30a is urged upward.
A stopper 39a made of a height-adjustable screw is screwed to the front end of each of the support pieces 31, 31, and defines the upper limit position of the beak-shaped tip of the front guide table 30a urged upward by the bullet 37. are doing. Similarly, at the rear position of the support shaft 32, a stopper 39b that defines the lower limit position of the beak-shaped tip of the front guide table 30a is provided.

At the prescribed position, the front guide table 30a
Of the front guide table 30a is always inclined downward by the incoming work material.

The operation of the above configuration will be described. The height interval of the material feeding passage 11 is set in advance to a specified thickness (for example, 10 mm) of the work material. In addition, although there is a thickness error in each processing material, in order to secure processing efficiency,
No adjustment is made for each workpiece. When the work material is supplied to the material feeding passage 11, the traveling guide roll 2
The upper urging force is applied by the second ammunition 23, the upper surface thereof is pressed against the material feeding belt 8 and the running force is applied, and travels on the front material feeding tables 24 and 13 to arrive at the front guide table 30a. .

Here, in the conventional configuration, the traveling guide roll is fixed so as not to be able to move up and down, and the front pressing roll is urged downward (see FIG. 19). The upper surface of the processing material is pressed against the material feeding surface of the material feeding belt 8 immediately below the pressing plate 12 so as to determine the finish thickness dimension caused by the gap between the material feeding surface and the processing portion x of the sanding head 17. ing.

Here, when the work material arrives between the pressing plate 12 and the front guide table 30a, the front end of the front guide table 30a urged upward by the elastic machine 37 comes into pressure contact with the work material, and Retreat downward against 37. The retreat amount depends on the thickness of the work material, and the distance between the pressing plate 12 and the guide surface y at the tip of the front guide table 30a is equal to the thickness of the work material before grinding. Therefore, the processing portion x of the belt sanding head 17 that defines the grinding thickness of the processing material
The drop between the (upper end of the sanding belt 20 wrapped around the contact roll 18) and the guide surface y at the tip of the front guide table 30a varies depending on the thickness of the work material. If the work material is thin, it is ground thinly. That is, the finished thickness of the processed material after grinding is equal to the height interval (the height of the material feeding passage) between the lower surface of the material feeding belt 8 immediately below the pressing plate 12 and the processing portion x of the head. For this reason, even if there is a variation in the thickness of the work material, it is corrected by changing the grinding thickness, and the thickness becomes equal.

More specifically, when it is desired to finish a work material having a reference thickness of 10 mm to 9.7 mm, the upper frame 3 is moved up and down to adjust the material feeding passage 11, and the pressing plate 12 and the head are moved. 8. Set the height of the material feeding passage between it and the processing site x.
If it is 7 mm, the finished size is 9.7 m which is the appropriate material thickness
m can be obtained. In this case, the interval of the material feeding passage is adjusted by moving up and down the upper frame 3 and first using a scale (not shown) so as to have a width of 10 mm.
Further, the upper frame 3 is set using the dial gauge 16.
Is lowered by 0.3 mm. In this case, since a processing material of 10 mm is supplied at a feeding interval of 9.7 mm, 0.3 m
The traveling guide roll 22 is retracted downward by an amount corresponding to m and is opposed to the ammunition 23, and the traveling is enabled. By the way, for example, 9.
When a processing material having a thickness of 9 mm is inserted, the amount of depression of the front end of the front guide table 30a is reduced, and the processing portion x of the belt sanding head 20 and the front guide table 30a are reduced.
The drop from the tip of a is 0.2 mm, and the drop becomes a grinding dimension, and as a result, a finished dimension becomes 9.7 mm. That is, the grinding dimension changes due to the tilting of the front guide table 30a, so that even if there is an error in the thickness of the work material, the finished dimension is always corrected to 9.7 mm.

The work material ground in this manner is urged from above by the elastic machine 14 of the rear pressing roll 13b behind the pressing plate 12, whereby the upper surface thereof is pressed against the feed belt 8 and only the idle rotation is performed. Traveling guide roll 25 that enables
It runs stably on the upper surface, and the dust adhering to the lower surface is removed by the roll brush 29, or is polished by a polishing buff as needed, and is taken out from the post-feeding material table 27.

The work material whose lower surface has been ground by the lower surface grinding type belt sander machine is subjected to an upper surface finish grinding process in the next step as necessary. At this time, as described above, since the thickness of the processed material is unified to, for example, 9.7 mm thickness, an unground portion may be generated on the upper surface due to insufficient thickness of the processed material during the finish grinding. The surface is reliably ground and finished. Thus, the work material is subjected to the grinding process on both the upper and lower surfaces to be finished to a predetermined thickness.

Although the above-described structure is constituted by the front guide table 30a formed of a single plate, as shown in FIGS. 9 to 13, a plurality of divided guide tables 4 arranged in the width direction are arranged.
0 may constitute the front guidance table 30b.

Such a configuration will be described with reference to FIGS. The same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Just before the contact roll 18, a support shaft 42 is extended to the side plate of the front guide frame 10a. A plurality of divided turning pieces 43 each having a divided guide table 40 having the same width fixed to the upper surface thereof are rotatably fitted to the support shaft 42, and are closely arranged in parallel. Each of the divided rotary pieces 43 is held by a holding ring 51 fixed to the both ends and an appropriate intermediate position so as not to move in the longitudinal direction with respect to the support shaft 42. The division guide table 40 is formed of a beak-shaped metal block having a flat upper surface, and is fixed on the division rotation piece 43 by screws 52. Thus, each of the divided guide tables 40 is supported so as to be tiltable with respect to the support shaft 42 via the divided rotary piece 43, and the front guide table 30b is provided by the plurality of divided guide tables 40 arranged in parallel. Is configured.

On the other hand, a mounting plate 50 extends across the front end of the side plate of the front guide frame 10a in the width direction, and is long on the front surface of the mounting plate 50 so as to cover each of the divided rotary pieces 43 upward. The elongated support piece 41 is fixed.

On the other hand, a hole 4
4 is formed, and a spring receiving piece 46 supported by a screw 45 so as to be adjustable in height on a supporting piece 41 is provided with a hole 4 of each divided rotating piece 43.
4 is inserted from above, and a spring 47 made of a spring is mounted between the spring receiving piece 46 and the inner bottom surface of the hole 44, and the rear end of the split rotary piece 43 is urged downward. The beak-shaped tip of each divided guide table 40 is urged upward. Also, the front end of the support piece 41 is opposed to each of the divided rotating pieces 43,
A large number of stoppers 49a made of screws whose height can be adjusted are screwed in, and define the upper limit position of the beak-shaped tip of the divided guide table 40 urged upward by the screws 45.
Similarly, at the rear position of the support shaft 42, a stopper 49b for defining the lower limit position of the divided guide table 40 is provided.

At the specified position, the division guide table 40
Is inclined upward toward the processing portion x of the material feeding belt 8 so that the front end of the divided guide table 40 always tilts downward due to the incoming processing material.

On the other hand, an auxiliary traveling table 53 is fixed on the support piece 41 so as to prevent a depression from being formed on the support piece 41, thereby stabilizing the traveling of the workpiece.

In such a configuration, each of the divided guide tables 40 can be tilted separately and independently. For this reason,
As shown exaggeratedly in FIG. 13A, when a plurality of narrow-width workpieces w are juxtaposed and supplied to the supply passage at the same time, each divided guide table 40 tilts corresponding to each workpiece, Each of them presses against the lower surface of the processing material, and presses the processing material against the lower surface of the material feeding belt 8 directly below the pressing plate 12. For this reason, even if each work material w is supplied simultaneously, it is ground so as to have a predetermined total thickness.

As shown exaggeratedly in FIG. 13B, even when the thickness of the workpiece w varies in the width direction, the divided guide tables 40 press against the lower surface of the workpiece to stabilize the workpiece. And the upper surface thereof is uniformly pressed against the lower surface of the material feeding belt 8 immediately below the pressing plate 12. That is,
If the processed material has a large thickness error in the width direction, for example, the single-plate guide table cannot be held up and down uniformly,
Grinding is performed while traveling with a slight inclination. That is, the grinding process is performed according to the variation in the width direction, and the variation is not corrected. However, in the present embodiment, the lower surface is urged upward by the divided guide table 40 for each predetermined width along each width direction, and the vehicle travels while being supported. It becomes possible and a grinding thickness corresponding to the thickness is provided. For this reason, variations in the width direction are eliminated, and the entire surface is finished to have a uniform thickness.

In each of the above-described configurations, the belt sanding head employs a roll grinding type in which the upper end of the contact roll is a processing portion x, but a front roll and a rear roll are provided before and after the pressure pad. And a pad grinding type in which an endless sanding belt is wound around these members and the guide drive roll, and the upper end of the stepping pad is a processing portion x.

The above-described configuration is an example in which the present invention is applied to a lower surface grinding type belt sander to which the present invention is applied, which is an example of a lower surface grinding machine for a work material. The present invention can also be applied to a lower surface cutting machine for cutting the lower surface of a work material.

In such a lower surface cutting machine, FIGS.
Is related to the embodiment using the rotary plane cylinder 60 as a cutting tool. This embodiment corresponds to the above-described embodiment in which the belt sanding head 17 is replaced with a rotary plane cylinder 60, and at least the rotating inner surface of the material feeding belt 8 of the material feeding device 9 is provided on the material passage side. The pressing plate 12 is disposed immediately above the processing portion of the plane cylinder 60 and the front end of the front guide table 30a, and the pressing rolls 13a, 1 are arranged before and after the pressing plate 12.
3b. Further, the front guide table 30a facing the rotary plane cylinder 60 has the above-described configuration, and performs the above-described operation. Thus, in FIGS.
The belt sanding head 17 is equivalent to the one obtained by replacing the belt sanding head 17 with a rotary plane cylinder 60 which is an example of a cutting tool, and its configuration and description will be cited.

Here, the rotary plane cylinder 60 is provided with a plurality of cutting blades 62 arranged along the peripheral surface of the cylindrical body 61, and its cutting edge is inclined and projected from the peripheral surface of the cylindrical body 61 in a clockwise direction. . The rotary plane cylinder 60 rotates clockwise in the figure, and with the rotation, the lower surface of the processing material supplied and supported on the guide surface y of the front guide table 30a is moved to the processing portion (upper end) of the rotary plane cylinder 60. Position).

The operation of the above configuration will be described. The height interval of the material feeding passage 11 is set in advance to a specified thickness of the work material. When the work material is supplied to the material feeding passage 11, an upward urging force is applied from below by the elasticity 23 of the traveling guide roll 22, and the upper surface is pressed against the material feeding belt 8 to apply the traveling force, and the preceding material feeding table is provided. The vehicle travels on 24 and 13 and arrives on the front guide table 30a. here,
In the present invention, the upper surface of the processing material is pressed against the feeding surface of the feeding belt 8 immediately below the pressing plate 12, and the feeding surface and the rotary plane cylinder 60 are pressed.
The final thickness dimension resulting from the distance between the two is determined.

The work material is the pressing plate 12 and the front guide table 3
When the time comes between 0a, the front end of the front guide table 30a, which is urged upward by the bullet 37, comes into pressure contact with the workpiece and retreats downward against the bullet 37. The retreat amount depends on the thickness of the work material, and the pressing plate 12 and the front guide table 30
The distance between the leading end of a and the guide surface y is equal to the thickness of the workpiece before cutting. For this reason, the rotary plane cylinder 60 for defining the cut thickness of the work material and the guide surface y at the tip of the front guide table 30a.
Varies depending on the thickness of the work material, and the thicker the work material, the thicker the cut, and the thinner the work material, the thinner the cut. In other words, the finished thickness of the work material after cutting is
This corresponds to the height interval (the height of the material feeding passage) between the lower surface of the material feeding belt 8 and the rotary plane cylinder 60 immediately below the second material feeding belt 8. For this reason, even if there is a variation in the thickness of the work material, it is corrected by changing the cut thickness, and the thickness becomes equal.

In the above-described configuration, the front guide table 30a made of a single plate is used.
9 to 13, the front guide table 30b may be constituted by a plurality of divided guide tables 40 arranged in the width direction, as shown in FIGS.

In such a configuration, each of the divided guide tables 40 can be tilted separately and independently. For this reason,
As shown exaggeratedly in FIG. 13A, when a plurality of narrow-width workpieces w are juxtaposed and supplied to the supply passage at the same time, each divided guide table 40 tilts corresponding to each workpiece, Each of them presses against the lower surface of the processing material, and presses the processing material against the lower surface of the material feeding belt 8 directly below the pressing plate 12. For this reason, even if each work material w is supplied simultaneously, it is cut so as to have a predetermined total thickness.

As shown exaggeratedly in FIG. 13B, even when the thickness of the work material w varies in the width direction, the divided guide tables 40 are pressed against the lower surface of the work material w to stabilize the work material. And the upper surface thereof is uniformly pressed against the lower surface of the material feeding belt 8 immediately below the pressing plate 12, so that it is possible to travel as evenly as possible and a cutting thickness corresponding to the thickness is provided. . This eliminates variations in the width direction,
The entire surface is finished to a uniform thickness.

FIGS. 16 and 17 relate to a lower surface cutting machine using a horizontal turning cutter 70 as a cutting tool. Here, as shown in FIG. 18, the horizontal turning cutter 70 is supported by a drive shaft of a motor 65, protrudes around the periphery of a turning table 71 at equal angular intervals with a plurality of arms 72, and The cutting blade 73 is fixed to the cutting blade 7.
The third cutting edge protrudes from the upper surface of the swivel 71. The horizontal turning cutter 70 is arranged with a slight inclination so that the work material can be cut only at a position facing the front guide table 30a. That is, the processing portion of the horizontal turning cutter 70 is a corner edge directly facing the front guide table 30a.

This embodiment is equivalent to the above-mentioned embodiment in which the belt sanding head 17 is replaced by a horizontal turning cutter 70.
At least the horizontal turning cutter 7
The pressing plate 12 is disposed immediately above the zero machining portion and the front end of the front guide table 30a, and pressing rolls 13a and 13b are provided before and after the pressing plate 12. Further, the front guide table 30a facing the horizontal turning cutter 70 has the above-described configuration, and performs the above-described operation. As described above, in FIGS. 1 to 13, the belt sanding head 17 is equivalent to the one obtained by replacing the rotary sanding cylinder 60 with the configuration and the description thereof. The cutting operation is the same as that described for the rotary plane cylinder 60, and a detailed description thereof will be omitted.

[0050]

According to the present invention, the front end of a cutting tool such as a belt sanding head or a rotary plane cylinder or a plane turning cutter for tilting the lower surface of a workpiece is pivotally supported so as to be tiltable, and the distal end is urged upward. When the work material arrives, the front end of the front guide table retreats downward according to the thickness of the work material, and the work site x of the belt sanding head is provided.
Alternatively, the head between the cutting tool and the guide surface y at the tip of the front guide table is made to fluctuate depending on the thickness of the work material, so that the work material is cut thicker and the work material is thinner so that the work material is thinner. In this way, the finished thickness of the work material was ensured to coincide with the height of the work passage between the work surface of the work belt immediately below the pressing plate and the processing site of the head or the cutting tool. For this reason, even if there is a variation in the thickness of the processed material, the thickness is corrected by changing the shaved thickness, and the thickness becomes equal, and the thickness of the processed material can be optimally finished.

Further, the front guide table is constituted by arranging a plurality of divided guide tables side by side in a direction perpendicular to the material feeding direction. In the one in which the tip end facing the processing part of the cutting tool is urged upward by an elastic machine, a plurality of narrow width processing materials are juxtaposed,
When the divided guide tables are simultaneously supplied to the supply passages, the respective divided guide tables are tilted in correspondence with the respective workpieces, so that even if the respective workpieces are simultaneously supplied, they are cut to a predetermined thickness. Further, even when the thickness of the work material varies in the width direction, the work material can be easily followed.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a bottom grinding type belt sander according to the present invention.

FIG. 2 is a front view of a bottom grinding type belt sander according to one embodiment of the present invention.

FIG. 3 is a side view of the lower surface grinding type belt sander machine according to the first embodiment;

FIG. 4 is a plan view showing a front guide table 30a.

FIG. 5 is a rear view showing the front guide table 30a.

FIG. 6 is a cross-sectional view of FIG.
It is A sectional drawing.

FIG. 7 is a side view of a main part showing the front guide table 30a.

FIG. 8 is a cross-sectional view taken along a line B- in FIG.
It is B sectional drawing.

FIG. 9 is a side view of a main part of another embodiment including a front guide table 30b.

FIG. 10 is a plan view of a main part showing a front guide table 30b.

FIG. 11 is a view showing a pivot support structure of a divided guide table 40;
FIG. 2 is a sectional view taken along line CC of FIG.

FIG. 12 is a sectional view taken along line DD of FIG. 10;

FIG. 13 is a conceptual diagram showing the operation of the division guide table 40.

FIG. 14 is a schematic side view of a lower surface cutting machine according to the present invention using a rotary plane cylinder 60.

15 is a side view of a main part of the lower surface cutting machine according to the present invention using the rotary plane cylinder 60. FIG.

16 is a schematic side view of a lower surface cutting machine according to the present invention using a plane turning cutter 70. FIG.

FIG. 17 is a side view of a main part of the lower surface cutting machine according to the present invention using the plane turning cutter 70;

FIG. 18 is a perspective view of the plane turning cutter 70.

FIG. 19 is a schematic side view of a conventional bottom sanding type belt sanding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower frame 3 Upper frame 8 Feeding belt 11 Feeding path 12 Pressing plate 17 Belt sanding head 18 Contact roll 22 Travel guide roll 24 Previous feed table 25 Travel guide roll 27 Rear feed table 30a, 30b Front guide table 31 Support Piece 32 support shaft 33 rotating piece 34 hole 26 rear guide table 37 ammunition 40 split guide table 41 support piece 42 support shaft 43 split rotating piece 60 rotary plane cylinder 62 cutting blade 70 horizontal revolving cutter 73 cutting blade

Claims (4)

[Claims] 1. A belt sanding head for grinding a lower surface of a work material is provided at a lower portion of a material feeding passage, a front guide table is provided at a front portion of the belt sanding head, and an upper portion of the material feeding passage is provided at an upper portion of the material feeding passage. A material feeding device is provided in which a material feeding belt is stretched between a driving roll and a driven roll, and inside the material feeding belt, at least at a processing portion of a belt sanding head and immediately above a front end portion of a front guide table. A press plate is disposed across the press plate, and in a lower surface cutting machine for a work material provided with press rolls before and after the press plate, a front guide table is pivotally supported so as to be tiltable, and a grinding end of the belt sanding head is provided. A lower surface shaving machine for a processing material, wherein opposing front ends are urged upward by an elastic machine. 2. A belt sanding head for grinding a lower surface of a work material is provided at a lower portion of a material feeding passage, a front guide table is provided at a front portion of the belt sanding head, and an upper portion of the material feeding passage is provided at an upper portion of the material feeding passage. A material feeding device is provided in which a material feeding belt is stretched between a driving roll and a driven roll, and inside the material feeding belt, at least at a processing portion of a belt sanding head and immediately above a front end portion of a front guide table. A press plate is provided across the press plate, and in a lower surface cutting machine for a work material provided with press rolls before and after the press plate, the front guide table is divided into a plurality of divided guide tables in a direction orthogonal to the material feeding direction. The divided guide tables are pivotally supported so that they can be tilted, and the tip of the belt sanding head facing the processing portion is urged upward by an elastic machine. Lower surface milling machine of the workpiece characterized by and. 3. A cutting tool such as a rotary plane cylinder or a plane revolving cutter for cutting a lower surface of a workpiece is provided at a lower portion of the material feeding passage, and a front guide table is provided at a front portion of the cutting tool. A material feeding device is provided in which a material feeding belt is stretched over a driving roll and a driven roll on a material feeding passage, and at least a processing portion of a cutting tool and a front guide table are provided inside the material feeding belt. A press plate is disposed immediately above the front end of the work piece, and a lower surface cutting machine for a work material provided with press rolls before and after the press plate. A lower surface cutting machine for processing a work material, wherein a tip portion facing the tool is urged upward by an elastic machine. 4. A cutting tool such as a rotary plane cylinder or a plane revolving cutter for cutting the lower surface of the workpiece is provided at a lower portion of the material feeding passage, and a front guide table is provided at a front portion of the cutting tool. A material feeding device is provided in which a material feeding belt is stretched over a driving roll and a driven roll on a material feeding passage, and at least a processing portion of a cutting tool and a front guide table are provided inside the material feeding belt. A press plate is disposed just above the tip of the press plate, and a lower surface cutting machine for a work material provided with press rolls before and after the press plate, wherein a front guide table and a plurality of divided guide tables are fed. In parallel with each other in a direction perpendicular to the direction, each divided guide table is pivotally supported so as to be tiltable, and the tip end facing the cutting tool is urged upward by an elastic machine. Machine for undersurface cutting of processed materials.