JPS6322926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Subject of the Invention) The present invention involves lowering a flexible band saw made of steel or the like endlessly wound between a pair of guide wheels while running.
The present invention relates to an automatic band saw cutting device for cutting an object made of metal or non-metal located below the band saw.

(Prior art) In this type of general cutting device, the band saw is moved horizontally and lowered to cut the workpiece, so the bottom of the cutting groove is straight and the band saw constantly cuts the workpiece. The length of the cut, that is, the cutting width, is equal to the width of the object to be cut. As this cutting width becomes longer,
Chips generated as the cutting operation progresses accumulate in the cutting groove, and eventually the gap between the blades of the band saw becomes clogged. This clogging is more likely to occur as the cutting width is larger and the material of the workpiece has poor machinability, such as stainless steel, which leads to heat generation due to increased cutting resistance and reduces cutting efficiency. This will eventually make cutting impossible and shorten the life of the band saw. Therefore, in order to avoid this, it is necessary to increase the size of the drive motor of the band saw at the expense of machine efficiency and work efficiency, or to keep the cutting speed low, and it is necessary to limit the width of the workpiece. Ta.

In contrast, the present applicants have previously filed a patent application filed in 1983-
No. 46330 (Special Publication No. 1987-20095) and Patent Application No. 1983-
No. 181053 (Japanese Unexamined Patent Publication No. 57-107729), etc., a swinging body equipped with a band saw is held in a swingable and tiltable manner on a pedestal that moves up and down along a guide column, and the swinging body is moved continuously or intermittently. This paper proposes a method and an apparatus for cutting an object below with a band saw that moves downward while traveling. According to this device, as shown in FIG.
The object to be cut 3 is cut while changing the angle in the order of →g. Therefore, as shown in FIG.
The cutting groove bottom 4a has an arcuate curved shape with a high central part, and the cutting width l for constantly cutting the workpiece 3 is the same as that of the band saw 2.
This corresponds to the intersection width of the cutting groove bottom 4a and the tangent line t to the cutting groove bottom 4b, which is determined by the feed amount S of the cutting groove. Therefore, the cutting width l is a constant value determined by the feed amount S and the radius of curvature of the cutting groove bottom 4a, regardless of the width L of the workpiece, and since l is sufficiently smaller than L,
Even if chips enter between the blades of the band saw 2, they fall immediately afterward, and the occurrence of clogging is greatly suppressed.

In the above-mentioned device, since the swinging body is swingably held by the suspension arms on both the left and right sides, the swinging main body performs a swinging motion in an arc shape, and also performs a considerable amount of left and right reciprocating motion. It has become commonplace. Therefore, depending on the size, shape, material, etc. of the object to be cut, it is not necessarily optimal for causing the swinging body to perform a delicate swinging motion.

(Object of the Invention) An object of the present invention is to further improve the above-described device and provide an automatic bandsaw cutting device equipped with various structures for causing the swinging body to perform delicate swinging movements.

(Structure of the Invention) A first aspect of the present invention is an apparatus for cutting an object to be cut located below the band saw by moving and lowering a band saw endlessly wound between a pair of guide wheels, the device comprising:
Eccentric wheels that rotate in synchronization with each other are pivotally supported on both sides of the elevating main body that moves up and down along a guide column that stands approximately vertically. Roller guide members each having a guide wall portion formed in an arc shape centered on the midpoint are fixedly installed on both sides of the lifting main body, and roller guide members are fixed on both sides of the swinging main body in which the guide wheel pair and band saw are housed. , supporting rollers that rotate on the eccentric wheel are supported, and these support rollers are fitted over the roller guide member fixed to the elevating main body and are movable only in the vertical direction along the guide wall. The swinging body is configured to swing in accordance with the locus of movement of both support rollers.

The second aspect of the present invention is an apparatus for cutting an object to be cut located below the band saw by moving and lowering a band saw endlessly wound between a pair of guiding wheels,
Approximately horizontal support plates are provided on both sides of the elevating body that ascends and descends along a guide column that stands approximately vertically, and the support plates are placed on both sides of the swinging body that houses the guide wheel pair and band saw. Eccentric wheels that rotate in synchronization with each other while rolling contact are supported via swing shafts, and a guide roller is supported coaxially with these swing shafts. Roller guide members each having a guide wall portion formed in an arc shape are fixed to both sides of the elevating main body, and the guide rollers pivotally supported on both sides of the swinging main body are attached to the elevating main body. The roller guide member is fitted over the fixed roller guide member and is restricted to be movable only in the vertical direction along the guide wall, so that the swinging body swings in accordance with the locus of movement of both guide rollers. It is composed of

A third aspect of the present invention is an apparatus for cutting a workpiece located below the band saw by moving and lowering a band saw endlessly wound between a pair of guide wheels,
Support rollers are pivotally supported on both sides of an elevating body that ascends and descends along a guide column that stands approximately vertically. Plate cams that are rotationally driven in synchronization with each other are supported via swing shafts, and a guide roller is supported coaxially with these swing shafts, so that the center of the plate cams is centered at the midpoint between these two plate cams. Roller guide members each having a guide wall portion formed in an arc shape are fixedly installed on both sides of the lifting main body, and the guide rollers are pivotally supported on both sides of the swinging main body.
The roller guide member is fitted over the roller guide member fixed to the lifting body and is restricted to move only in the vertical direction along the guide wall, and the swinging body moves in accordance with the locus of movement of both guide rollers. It is configured to swing.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In FIGS. 3 to 5, reference numeral 11 denotes an elevating main body, and a guide tube 1 is slidably fitted into two guide columns 13, 13 vertically installed on the base 12.
4, 14 and the beam 1 installed horizontally between them.
5, and is moved up and down along the guide supports 13, 13 by hydraulic cylinders 16, 16 attached so that the direction of expansion and contraction is parallel to the guide support 13. Reference numeral 17 denotes a swinging main body, which is constructed between case parts 17a and 17b that house a pair of guide wheels 19a and 19b, each of which is endlessly wound with a flexible band saw 18 made of steel, and the upper part of both case parts 17a and 17b. and the non-cutting side 18 of the bandsaw 18
It is composed of an upper plate part 17c containing a.

Support brackets 20a, 20b each having an outward U-shape are attached to both guide tubes 14, 14, and eccentric wheels 21a, 21a, 21b, 2 attached to each end of the support brackets 20a, 20b are attached to each of the support brackets 20a, 20b.
Swing shafts 22a and 22b that rotate integrally with 1b are pivotally supported. The swinging body 17 is attached to the brackets 2 attached to the case parts 17a and 17b.
3a, 23a, 23b, 23b each have a support shaft 2.
Support rollers 25a, 25a, 25b, 25b pivotally supported by 4a, 24a, 24b, 24b
is in rolling contact with the circumferential surfaces of the eccentric wheels 21a, 21b from above, and the support rollers 25a, 2
5b, a substantially downward U-shaped roller guide member 26 fixed to the support brackets 20a, 20b.
a, 26a, 26b, and 26b are held so as to fit over each other and restrict their horizontal movement.

On the other hand, the lower ends of rocking levers 27a, 27b are connected and fixed to each rocking shaft 22a, 22b, and the upper ends of rocking levers 27a, 27b are connected to a horizontal lever 28.
a, 28b and pins 29a, 29b, respectively, so as to be rotatably connected. horizontal lever 28a,
28b is rotatably connected by a drive shaft 32 to the other end of a vertical lever 31 whose one end is pivotally supported by a bracket 30 on the upper center surface of the beam 15, and to which a bracket fixed to the beam 15 is connected. Rod 3 of hydraulic cylinder 34 pivoted to 33
The tip portion 4a is rotatably connected.

As shown in FIG. 5, left and right eccentric wheels 21a, 21
b is attached at a position where the eccentric angles are shifted by 90 degrees from each other in the average swinging posture of the swinging body 17, and the roller guide members 26a and 26b are attached to the left and right guide walls 26c. ,2
6c is the midpoint of the center line connecting the centers of both support rollers 25a, 25b or both eccentric wheels 21a, 21b
It has an arc shape centered on P ₁ , so both eccentric wheels 2 are driven by the telescopic drive of the hydraulic cylinder 34.
1a, 21b, both support rollers 25a, 25b move toward the guide walls 26c, 2, respectively.
6c in opposite directions, and the swinging body 17 is configured to swing approximately around point _P1 . Note that the upper plate portion 17c of the swinging body 17 has through holes 35, 35 through which the guide columns 13, 13 are inserted. 36 is the base 12
The object to be cut is placed and fixed at a predetermined position on the top.

In the above configuration, the elevating main body 11 is the swinging main body 1
7 and is lowered by its own weight, and the lowering speed and start and stop of the lowering are controlled by hydraulic cylinders 16, 16. Further, the hydraulic cylinders 16, 16 have the function of raising the lifting platform 11 together with the swinging body 17 by driving the hydraulic cylinders 16, 16. As the hydraulic cylinder 24 is driven to extend and contract, the horizontal lever 28a,
The eccentric wheels 21a and 21b reciprocate through the swing levers 28b and swing levers 27a and 27b, and the swing main body 17
The support rollers 25a and 25b perform a rocking motion of reciprocating left and right about the intermediate point P1.
For example, when the hydraulic cylinder 34 is at the maximum extension position, the swing levers 27a and 27b are at the A1 position in FIG. 5, the support rollers 25a and 25b are at the B1 position, and the support roller 25
It is tilted to the position of the center line C1 connecting the centers of a and 25b. Conversely, when the hydraulic cylinder 34 is at the maximum contraction position, the swing levers 27a, 27b are
2. The support rollers 25a and 25b are at the position B2, and the above-mentioned center line is inclined to the position C2.

Therefore, the swinging body 17 descends while performing a swinging motion, but the amount of swinging motion is determined by the expansion and contraction stroke of the hydraulic cylinder 34 and the swinging lever 27.
It can be adjusted by changing the lengths of a and 27b, the amount of eccentricity of eccentric wheels 21a and 21b, etc., and the locus of movement of support rollers 25a and 25b can be adjusted by changing the length of
The shape of 6c... can be changed.

Next, a second embodiment of the present invention is shown in FIGS. 6 and 7.
The explanation will be made based on the drawings, and the same parts as those previously explained in FIGS. 3 to 5 will be given the same reference numerals and the explanation will be omitted.

A horizontal support plate 3 is provided on both guide tubes 14, 14.
7a and 37b are fixed. On the other hand, brackets 38a and 38b attached to case portions 17a and 17b of the swinging body 17 have eccentric wheels 40a and 38b having rotatable rollers 39a and 39b on their outer peripheries, respectively.
Swing shafts 41a and 41b that rotate integrally with 40b
The eccentric wheels 40a, 40b are in rolling contact with the above-mentioned support plates 37a, 37b, and the above-mentioned guide tubes 14 are mounted on guide rollers 42a, 42b provided at the outer ends of the swing shafts 41a, 41b. ,14
The swinging main body 17 is held by the elevating main body 11 in such a manner that substantially downward U-shaped roller guide members 43a and 43b fixed thereto are fitted over and restrict the left and right movement of the roller guide members 43a and 43b.

The lower ends of swing levers 44a, 44b are connected and fixed to each of the above-mentioned swing shafts 41a, 41b,
Each swing lever 44a, 44b passes through the upper plate portion 17c, and its upper ends are connected to each other by a horizontal lever 46 via pins 45a, 45b. A rod 48a tip of a hydraulic cylinder 48, which is pivotally supported by a bracket 47 on the upper plate 17c, is rotatably connected to the center of the horizontal lever 46.

Both guide tubes 14, 14 have eccentric wheels 40a, 4.
On the part that slides on the side of 0b as it rotates,
A sliding surface receiving mechanism as shown in FIG. 8 is provided. In this figure, a guide plate 49 is attached to the guide cylinder 14, and rollers 50, 50 that are pivotally supported by the guide plate 49 are in rolling contact with the inner surface of the eccentric ring 40a, and the swing shaft 41a of the eccentric ring 40a is rotated. Axial movement is restricted.

As shown in FIG. 7, left and right eccentric wheels 40a, 40
b is attached at a position where the eccentric angles are shifted by 90 degrees from each other and are symmetrical in the average swinging posture of the swinging body 17, and the roller guide members 43a and 43b are attached to the left and right guide walls. 43c,
43c is the midpoint P2 of the center line connecting the centers of both swing shafts 41a, 41b or both eccentric wheels 40a, 40b
It forms an arc with the center at . Therefore,
Both eccentric wheels 40 are driven by expansion and contraction of a hydraulic cylinder 48.
As rollers 39a and 40b rotate, rollers 39a and 40b rotate.
39b is in rolling contact with the support plates 37a, 37b, and the guide rollers 42a, 42b are in contact with the guide wall 4.
3c and 43c in mutually opposite directions, and the swinging body 17 is configured to perform swinging motion approximately centered on the midpoint P2. For example, when the hydraulic cylinder 48 is at the maximum extension position, the swing levers 44a and 44b are respectively moved to D1 in FIG.
, the guide rollers 42a and 42b are at the E1 position, and the center line connecting the centers of the support shafts 41a and 41b is inclined to the F1 position. Conversely, when the hydraulic cylinder 48 is at the maximum contraction position, the swing levers 44a, 44b are at the D2 position, the guide rollers 42a, 42b are at the E2 position, and the center line is inclined to the F2 position.

Therefore, the swinging body 17 descends while performing a swinging operation, but the amount of swinging movement is determined by the expansion and contraction stroke of the hydraulic cylinder 48 and the swinging lever 44.
It can be adjusted by changing the lengths of a and 44b, the amount of eccentricity of eccentric wheels 40a and 40b, etc., and the locus of movement of guide rollers 42a and 42b can be changed by changing the shape of guide wall portions 43c... .

Next, a third embodiment of the present invention is shown in FIGS. 9 and 10.
The explanation will be given based on the drawings, but the same parts as those in the above explanation will be given the same reference numerals and the explanation will be omitted.

A bracket 51 is attached to both guide tubes 14, 14.
Support rollers 52a and 52b are pivotally supported via a and 51b, while the case portion 1 of the swinging body 17
Bracket 53a attached to 7a, 17b,
Swing shafts 55a and 55b that rotate integrally with the plate cams 54a and 54b are pivotally supported on the plate cams 54a and 54b, and the plate cams 54a and 54b are supported by the above-mentioned support rollers 52a and 53b.
52b, and the swing shafts 55a, 5
Guide rollers 56a, 56 provided at the outer end of 5b
b, substantially downward U-shaped roller guide members 57a, 57b fixed to the above-mentioned guide tubes 14, 14;
The swinging main body 17 is held by the elevating main body 11 in such a manner that the swinging main body 17 is fitted over and restricts its left-right movement.

Sprockets 58a, 58b are fixed to each of the above-mentioned swing shafts 55a, 55b, and these sprockets 58a, 58b are connected to the upper plate portion 17c.
Sprockets 58c, 58d, 58 provided in
Chains 59a, 59b,
59c and 59d, they are rotated in the same direction and at the same speed by a motor 60 with a reduction gear.

As shown in FIG. 10, the left and right plate cams 54a, 5
4b is attached at a position where the center angles are shifted by 180 degrees from each other and are symmetrical in the average swinging posture of the swinging body 17, and the roller guide members 57a and 57b are attached to the left and right guide walls. 57
c and 57c form a circular arc centered on the midpoint P3 of the center line connecting the centers of both swing shafts 55a and 55b or both plate cams 54a and 54b. Therefore, both plate cams 5 are rotated by the hydraulic motor 60.
With the rotation of 4a and 54b, the plate cam 54
The circumferential surfaces of a and 54b roll on support rollers 52a and 52b, and guide rollers 56a and 56b
move up and down in mutually opposite directions along the guide walls 57c, 57c, and the swinging body 17 is configured to perform swinging motion with its center line between G1 and G2 with the center point P3 as its center. There is.

Therefore, the swinging body 17 descends while performing a swinging motion, but the amount of swinging motion can be adjusted by changing the eccentricity of the plate cams 54a, 54b, etc. The trajectory of movement of the guide walls 56a and 56b can be changed depending on the shape of the guide wall portions 57c.

The embodiments of the present invention have been described above with reference to FIGS. 3 to 10. In each of these embodiments, the lowering speed of the elevating body 11 is adjusted by the two left and right hydraulic cylinders 16, 16. , various cutting patterns can be obtained. For example, if the hydraulic cylinders 16, 16 are lowered at a constant speed while swinging the swinging body 17 at a fixed period, the 12th
As shown in Figure A, the cutting amounts X ₁ , X ₂ . Assuming that the movable body 17 is lowered by a certain amount only at each maximum tilt angle position, the cutting amounts Y ₁ and Y ₂ are determined as shown in FIG. 12B.
The amount of cutting can be made almost uniform from the initial stage y to the final stage.

In order to obtain the cutting pattern shown in FIG. 12B, in addition to the method of controlling the lowering timing of the hydraulic cylinder 16 described above, a method of controlling with a plate cam as shown in FIG. 11 can be considered. 11th
In the figure, the rod 16a of the hydraulic cylinder 16 is slidably inserted into the annular support portion 14a protruding from the guide tube 14, and a roller 61 is attached to the tip of the rod 16a. The outer peripheral edge of a plate cam 63 attached to the lower surface via a bracket 62 is in contact with the roller 61.
Further, the plate cam 63 is rotationally driven via a sprocket, a chain, etc. (not shown), and the rotation of the plate cam 63 is synchronized with the swinging movement of the swinging body 17. This plate cam 63 has concave portions 63a, 63a and smooth curved portions 63b, 6 whose radius gradually increases, which are continuous with concave portions 63a, 63a, at symmetrical positions on the outer peripheral edge.
3b is formed, and one of the recessed portions 63a, 63a is set at a position such that it comes into contact with the roller 61 near the time when the swinging body 17 reaches the maximum left and right tilting angle. Therefore, the swinging body 17 performs a swinging motion and the roller 61
This vertical movement causes the swinging body 1 to move up and down.
7 becomes the maximum amount of descent when it reaches the maximum left and right tilting angle, and then gradually rises and reaches the maximum amount of descent again when it reaches the maximum tilting angle on the opposite side. Note that the rotation of the plate cam 63 described above is controlled by the swinging body 1.
As a method to synchronize with the rocking motion of 7,
For example, the plate cam 63 may be rotated by the motor 60 described in FIG. 9.

(Effects of the Invention) As explained above, according to the present invention, the rocking motion of the rocking body can be finely adjusted by adjusting the shape and drive amount of the eccentric wheel or plate cam, and Since the movable body can be swung approximately in a rotational motion about its midpoint, an optimal oscillating motion can be performed depending on the size, shape, material, etc. of the object to be cut.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing the automatic band saw cutting operation according to the prior art, FIG. 2 is a sectional front view showing the cutting state of the object to be cut in the above operation, and FIG. 3 is the first automatic band saw cutting device of the present invention. FIG. 4 is a front view showing an embodiment of the same, FIG. 5 is a schematic diagram of the swinging motion of the device, and FIG. 6 is a second embodiment of the automatic band saw cutting device of the present invention. 7 is a schematic diagram of the swinging motion of the device, FIG. 8 is a side view of the main part of the eccentric ring portion of the device, and FIG. 9 is a third embodiment of the automatic band saw cutting device of the present invention. A front view showing an example, FIG. 10 is a schematic diagram of the rocking movement of the device, and FIG. 11 is a partial view showing an example of the device for controlling the descending movement of the elevating main body.
FIGS. 12A and 12B are explanatory diagrams showing the cutting amount of the object to be cut for each swing cycle in the present invention. 11... Lifting main body, 13... Guide column, 17
...Swinging body, 17a, 17b...Case part, 1
8... Band saw, 19a, 19b... Guide wheel, 21a,
21b...Eccentric wheel, 25a, 25b...Support roller, 26a, 26b...Roller guide member, 26
c...Guide wall portion, 36...Object to be cut, 37a,
37b...Support plate, 40a, 40b...Eccentric wheel,
41a, 41b... Swing shaft, 42a, 42b...
Guide rollers, 43a, 43b...Roller guide members, 52a, 52b...Support rollers, 54a,
54b...plate cam, 55a, 55b...swing shaft,
56a, 56b...Guide roller, 57a, 57
b...Roller guide member, 57c...Guide wall portion, P1, P2, P3...Middle point.

Claims (1)

[Scope of Claims] 1. A device for cutting an object to be cut located below the band saw by lowering it while running a band saw wound endlessly between a pair of guiding wheels, the device being installed approximately vertically. Eccentric wheels that rotate in sync with each other are pivotally supported on both sides of the lifting main body that moves up and down along the guide column, and above each of these eccentric wheels there is a shaft centered on the midpoint between the two eccentric wheels. Roller guide members each having a guide wall portion formed in an arc shape are fixedly installed on both sides of the lifting main body, and roller guide members having guide walls formed in an arc shape are fixedly installed on both sides of the swinging main body in which the guide wheel pair and the band saw are housed. Support rollers that rotate in contact are pivotally supported, and these support rollers are fitted over the roller guide member fixed to the elevating main body and are restricted to be movable only in the vertical direction along the guide wall portion thereof, An automatic band saw cutting device characterized in that the swinging body is configured to swing in response to the movement trajectory of both support rollers. 2 A device that cuts an object to be cut located below the band saw by lowering it while running a band saw wound endlessly between a pair of guide wheels, and the device moves up and down along a guide column that stands approximately vertically. Approximately horizontal support plates are provided on both sides of the elevating body, and eccentrics are provided on both sides of the swinging body in which the pair of guide wheels and the band saw are housed, and are driven to rotate in synchronization with each other while rolling on the support plates. The wheels are supported via swinging shafts, and a guide roller is supported coaxially with these swinging shafts, and a guide wall portion is formed in an arc shape centered on the midpoint between these two eccentric wheels. Roller guide members having respective roller guide members are fixed to both sides of the elevating main body, and the guide rollers pivotally supported on both sides of the swinging main body are fitted over the roller guide members fixed to the elevating main body. Automatic bandsaw cutting characterized in that the lever is restricted to be movable only in the vertical direction along its guide wall, and the swinging body is configured to swing in response to the movement locus of both guide rollers. Device. 3 A device that cuts an object to be cut located below the band saw by lowering it while running a band saw wound endlessly between a pair of guide wheels, and the device moves up and down along a guide column that stands approximately vertically. Support rollers are pivotally supported on both sides of the elevating body, and plate cams are rotatably driven in synchronization with each other while rolling on the support rollers on both sides of the swinging body housing the guide wheel pair and band saw. The guide rollers are supported via swing shafts, and guide rollers are supported coaxially with these swing shafts, and each has a guide wall portion formed in an arc shape centered on the midpoint between these two plate cams. Roller guide members are fixedly installed on both sides of the lifting main body, and the guide rollers, which are pivotally supported on both sides of the swinging main body, are fitted over the roller guide members fixedly installed on the lifting main body. An automatic bandsaw cutting device characterized in that it is restricted to be movable only in the vertical direction along a guide wall, and is configured to swing a swinging body in accordance with the locus of movement of both guide rollers.