Band saw device

Abstract

To provide a band saw device 10 that can be reduced in weight so as to be convenient in portability and is easy to operate.SOLUTION: When performing an oblique cut at a cutting angle of 45 degrees, a clamp lever 32 is pushed down to release pressurized contact on a lock piece 36, and the clamp lever 32 is rotated along a guide hole 34 to rotate a pedestal 22 by an angle of 45 degrees with a base rotation shaft 31 as a fulcrum. Then, the clamp lever 32 is raised up to cause a guide piece 35 to be in sliding contact with the guide hole 34, and the lock piece 36 is subjected to pressurized contact against the rear side of the bottom surface of the guide hole 34 to lock the pedestal 22 to a base 11. Then, a fixed clamp 23 and a movable clamp 24 clamp a pipe material 40 to fix it to the base 11, and a frame 12 is lowered onto the base 11 to press a blade of a band saw 16 exposed in a cutting opening 12c against the pipe material 40 to cut the pipe material 40. The pipe material 40 is formed with a cut end surface 40c that intersects with a center line 40b of the pipe material 40 at 45 degrees.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a band saw device that cuts workpieces such as metal materials, plastic materials, and wood using an endless band saw that is rotated at high speed by a motor. [Background technology]

[0002] As one type of band saw device, JP 2022-86049 A and JP 59-59308 A disclose a band saw device that includes a base, a vice for fixing a workpiece to the base, and a frame that is attached to the base so that it can be raised and lowered with the frame pivoted as a fulcrum.

[0003] In this band saw device, a frame is provided with a drive pulley, a driven pulley, an endless band saw wound between the two pulleys, a cooling fan that draws outside air into the frame, and a motor that drives the cooling fan and the drive pulley.

[0004] In addition, a cutting opening is formed in the frame through which the band saw runs while being partially exposed, and band saw guides are provided at both the front and rear ends of the cutting opening for twisting the band saw exposed in the cutting opening so that the blade of the band saw faces downward.

[0005] To cut a workpiece such as a pipe material with this band saw device, the frame is rotated so as to stand up from the base, and the workpiece is clamped in a vice and fixed to the base.

[0006] Next, the frame is rotated so as to be laid down on the base, and the blade of the band saw exposed in the cutting opening is pressed against the workpiece to cut the workpiece. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2022-86049 [Patent Document 2] Japanese Utility Model Application Publication No. 59-59308 Summary of the Invention [Problem to be solved by the invention]

[0008] By the way, when cutting pipe material as a workpiece, a band saw machine is usually equipped with a function that allows for normal cutting, where the cut end surface of the pipe material is perpendicular to the center line of the pipe material, and oblique cutting, where the cut end surface of the pipe material intersects the center line of the pipe material at an angle. A conventional band saw machine 100 equipped with such a function is shown in Figs. 12 and 13.

[0009] A frame 102 is rotatably attached to a base 101 of this band saw device 100. A vice 103 is also fixed to the base 101. This vice 103 is equipped with an iron base 104, a fixed clamp 105, and a movable clamp 106. The fixed clamp 105 is fixed to the base 104 with two bolts 107, 108. When these bolts 107, 108 are loosened, the fixed clamp 105 can slide along guide grooves 109, 110 formed in the base 104. The movable clamp 106 is rotatably attached to one end of a slide rod 111. The movable clamp 106 is also slidably attached to the guide groove 110. A clamp handle 112 is attached to the other end of the slide rod 111.

[0010] To cut a pipe material at a cutting angle of 0° using this band saw device 100, the movable clamp 106 is slid along the guide groove 110 as shown in Figure 12, the pipe material 40 is clamped between the fixed clamp 105 and the movable clamp 106, and the clamp handle 112 is operated to lock the slide rod 111 and fix the pipe material 40 to the table 104. Then, the frame 102 is lowered onto the base 101, and the band saw built into the frame 102 is rotated at high speed by the motor 113 to cut the pipe material 40.

[0011] On the other hand, to cut the pipe material 40 obliquely at a cutting angle of 45°, loosen bolts 107 and 108 and slide them along guide grooves 109 and 110, respectively, to tilt the fixed clamp 105 so that it forms a 45° angle with respect to the guide groove 110, and then tighten bolts 107 and 108 again with a wrench to fix the fixed clamp 105 to the base plate 104.

[0012] Next, the movable clamp 106 is slid along the guide groove 110, the pipe material 40 is clamped between the movable clamp 106 and the fixed clamp 105, the clamp handle 112 is operated to lock the slide rod 111 to the base plate 104, the pipe material 40 is fixed to the base plate 104, and the frame 102 is lowered to cut it with a band saw.

[0013] Incidentally, since this type of band saw device 100 is often used as a portable device, it is desirable to reduce its weight and the transportation weight. To reduce the weight of the band saw device 100, it is effective to reduce the size of the heavy iron vice, which requires strength.

[0014] When cutting pipe material 40 obliquely with a conventional band saw device 100, bolts 107 and 108 are moved along guide grooves 109 and 110, respectively, so that fixed clamp 105 forms a required angle with respect to guide groove 110. For this reason, table 104 must have a required length dimension that allows bolts 107 and 108 to move in a manner necessary for fixed clamp 105 to form a required angle with respect to guide groove 109, and there is a limit to how much the vise 103 can be made lighter by making it shorter than the required dimension.

[0015] Furthermore, when making oblique cuts using the conventional band saw device 100, in order to firmly clamp the pipe material 40 between the fixed clamp 105 and the movable clamp 106, it is necessary to use a wrench to tightly tighten the bolts 107 and 108, making it difficult to use. SUMMARY OF THE PRESENT EMBODIMENT In view of the above problems, an object of the present invention is to provide a band saw apparatus which is lightweight so as to be easily portable and easy to operate. [Means for solving the problem]

[0016] The present invention comprises a base having a vice for fixing a workpiece, and a frame that is attached to the base so as to be able to stand up and fall down with the frame rotation shaft as a fulcrum, The frame is provided with a drive pulley, a driven pulley, an endless band saw wound between the two pulleys, a cooling fan for drawing outside air into the frame, and a motor for driving the cooling fan and the drive pulley, and a cutting opening is formed through which the band saw travels partially exposed, and band saw guides are provided at both the front and rear ends of the cutting opening for twisting the band saw exposed in the cutting opening so that the blade of the band saw faces downward, The frame is raised and the workpiece is fixed to the base with a vice. A band saw device that cuts a workpiece by lowering a frame onto a base and pressing a band saw blade exposed in a cutting opening against the workpiece, The vise is provided with a base, a fixed clamp and a movable clamp, The fixed clamp is fixed to the base plate, and the movable clamp is slidably mounted on the base plate to hold the workpiece between the fixed clamp and the movable clamp. The table is rotatably connected to the base by a table rotation shaft provided at one corner of the table on the fixed clamp side, A guide rod is slidably fitted to a circular arc-shaped guide hole having a curvature center on the base rotation axis formed in the base, the guide rod being vertically installed from the other corner of the base; providing a locking means for releasably locking the guide rod in the guide hole; The table is rotated on the base with the table rotation axis as a fulcrum, and the guide rod is locked with a locking means, so that either a normal cut in which the cut end face of the pipe material cut as a processed product is perpendicular to the center line of the pipe material, or an oblique cut in which the cut end face of the pipe material intersects obliquely with the center line of the pipe material can be selected alternatively.

[0017] Preferably, a guide piece that slides against the inner circumferential surface of the guide groove and a lock piece that moves toward and away from the bottom of the guide hole are fixed to the tip end of the guide rod, and a clamp lever is attached to the base end of the guide rod so as to be movable up and down. When the base is rotated, the clamp lever is pressed down to separate the lock piece from the bottom of the guide groove, and the guide piece slides along the guide groove. When the platform is fixed to the base, the clamp lever is raised so that the lock piece is pressed against the bottom of the guide groove. Effect of the Invention

[0018] According to the band saw of this embodiment, when performing an oblique cut, the table rotates on the base with the table rotation axis as the fulcrum, but the fixed clamp remains fixed to the table and does not rotate. Therefore, when performing an oblique cut as in the conventional band saw, there is no need to move the bolt that fixes the fixed clamp to rotate it, so the length of the table can be made as short as possible, which makes it possible to reduce the weight of the vice and therefore the weight of the band saw.

[0019] In addition, when performing diagonal cutting, the table can be locked to the base by moving the clamp lever up and down, which requires less force than using a wrench to tightly tighten or loosen the bolts, making it easy to use. [Brief description of the drawings]

[0020] [Figure 1] 1 is a front perspective view showing a band saw apparatus according to an embodiment of the present invention; [Diagram 2] 1 is a perspective view showing a band saw device according to an embodiment of the present invention, as viewed from the rear side. [Diagram 3] 1 is a front view showing a band saw apparatus according to an embodiment of the present invention; [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. [Diagram 5] 1 is a perspective view showing a drive pulley, a driven pulley, and a band saw of a band saw apparatus according to one embodiment of the present invention. FIG. [Figure 6] FIG. 2 is a plan view showing the band saw device. [Figure 7] FIG. 2 is a perspective view showing a base of the band saw device. [Figure 8]FIG. 4 is a partial cross-sectional view showing a vice of the band saw apparatus. [Figure 9] FIG. 4 is a front perspective view showing a method of using the band saw device. [Figure 10] FIG. 4 is a front view showing a method of using the band saw device. [Figure 11] FIG. 4 is a plan view showing a method of using the band saw device. [Figure 12] FIG. 1 is a plan view showing a conventional band saw device. [Figure 13] FIG. 1 is a plan view showing a conventional band saw device. EXAMPLES

[0021] The present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a band saw device 10 according to an embodiment of the present invention. The band saw device 10 includes a base 11 and a frame 12. The frame 12 is mounted on the base 11 so as to be able to stand up and lie down with a frame rotation shaft 13 as a fulcrum. A driving pulley 14 and a driven pulley 15 are provided inside the frame 12, as shown by the broken lines in FIG. 3, and an endless band saw 16 is wound between the pulleys 14 and 15. The storage space 12a of the frame 12 in which the driving pulley 14 and the driven pulley 15 are provided is covered with a back cover 12b. The frame 12 is formed with a cutting opening 12c through which the band saw 16 travels while being exposed. At the front and rear ends of the cutting opening 12c, as shown in FIG. 5, band saw guides 17a and 17b are provided for twisting the band saw 16 exposed in the cutting opening 12c so as to point the blade of the band saw 16 downward.

[0022] A motor 19 for driving the drive pulley 14 is provided upright on the frame 12. As shown in Fig. 4, a cooling fan 20 for drawing outside air into the storage space 12a is attached to a main shaft 19a of the motor 19. An air passage 12d is formed in the storage space 12a of the frame 12 to guide the air blown by the cooling fan 20 to the periphery of the band saw guide 17a on the front side in the traveling direction of the band saw 16. The frame 12 is also provided with a handle 18 which is grasped when the frame 12 is raised from the base 11 or lowered onto the base 11 with the frame rotation shaft 13 as a fulcrum.

[0023] A vice 21 for fixing a workpiece to the base 11 is provided on the upper surface of the base 11. The configuration of the vice 21 is shown in detail in Figures 6, 7 and 8. The vice 21 is equipped with an iron base plate 22, a fixed clamp 23 and a movable clamp 24. The fixed clamp 23 is fixed to the base plate 22 with a bolt 25. A slide block 27a is connected to the movable clamp 24 with a bolt 27, and the slide block 27a is slidably assembled in a guide groove 29 formed in the base plate 22. One end of a slide rod 26 is connected to the slide block 27a. A clamp handle 28 is attached to the other end of the slide rod 26. A lock lever 30 for releasably locking the slide rod 26 is provided on the base plate 22. By operating the lock lever 30 to unlock the slide rod 26 and then grasping the clamp handle 28 to slide the slide rod 26, the movable clamp 24 slides on the base 22 along the guide groove 29 and moves toward and away from the fixed clamp 23, so that the pipe material 40 can be clamped between the movable clamp 24 and the fixed clamp 23 to fix the processed product to the base 11.

[0024] One corner of the base 22 on the side of the fixed clamp 23 is rotatably connected to the base 11 by a base rotation shaft 31. Meanwhile, a clamp lever 32 is attached to the corner of the base 22 on the opposite side of the base rotation shaft 31. A guide rod 33 (see FIG. 8) is vertically attached integrally to the clamp lever 32, and the tip of the guide rod 33 enters a guide hole 34 formed in the base 11. The guide hole 34 is formed in an arc shape with the base rotation shaft as the center of curvature. A guide piece 35 and a lock piece 36 are screwed and fixed to the tip of the guide rod 33. When the clamp lever 32 is in the state shown in FIG. 7 and FIG. 8, the guide piece 35 slides against the guide hole 34, and the lock piece 36 presses against the bottom back side of the guide hole 34, and the base 22 is locked to the base 11. By pressing down the clamp lever 32 to release the pressure on the lock piece 36, the clamp lever 32 can be rotated along the guide hole 34, and the base 22 can be rotated at any angle with the base rotation shaft 31 as the fulcrum.

[0025] The configuration of the band saw device 10 according to this embodiment has been described above. The procedure for cutting a PVC pipe material 40 as a workpiece using the device 10 will be described with reference to Figs. To cut pipe material 40 with this band saw device 10, the frame 12 is raised, the pipe material 40 is placed on the base 22 of the vice 21, the movable clamp 24 is slid to clamp the pipe material 40 between the fixed clamp 23 and the movable clamp 24, and the pipe material 40 is fixed to the base 11.

[0026] Next, the frame 12 is laid down on the base 11, and the blade of the band saw 16 exposed in the cutting opening 12c is pressed against the pipe material 40 to cut the pipe material 40. The cut end surface 40a of the cut pipe material 40 is perpendicular to the center line 40b of the pipe material 40.

[0027] The procedure for performing an oblique cut with the band saw device 10 so that the cut end surface 40a of the pipe material intersects with the center line 40b of the pipe material 40 at 45 degrees will be described with reference to Figure 11. The clamp lever 32 is pushed down to release the pressure on the lock piece 36, and the clamp lever 32 is rotated along the guide hole 34 to rotate the base plate 22 by an angle of 45 degrees with the base plate rotation shaft 31 as a fulcrum. Then, the clamp lever 32 is raised as shown in Figures 7 and 8 to bring the guide piece 35 into sliding contact with the guide hole 34 and bring the lock piece 36 into pressure contact with the bottom rear side of the guide hole 34, thereby locking the base plate 22 to the base 11. The pipe material 40 is then clamped between the fixed clamp 23 and the movable clamp 24 and fixed to the base 11, and the frame 12 is lowered onto the base 11 to press the blade of the band saw 16 exposed in the cutting opening 12c against the pipe material 40 to cut the pipe material 40. The pipe 40 has a cut end surface 40c that intersects with the center line 40b of the pipe 40 at 45 degrees.

[0028] With the band saw device 10 of this embodiment, when performing oblique cutting, the table 22 rotates on the base 11 with the table rotation shaft 31 as the fulcrum, but the fixed clamp 23 remains fixed to the table 22 and does not rotate. Therefore, when performing oblique cutting as with conventional band saw devices, there is no need to move and rotate the bolt 25 that secures the fixed clamp 23, so the length of the table 22 can be made as short as possible, which makes it possible to reduce the weight of the vice 21 and therefore the band saw device 10.

[0029] In addition, when performing diagonal cutting, the table 22 can be locked to the base 11 by vertically moving the clamp lever 32, which requires less force than using a wrench to tightly tighten or loosen the bolt 25, making it easy to use. [Explanation of symbols]

[0030] 10...Band saw device 11… Foundation 12...Frame 12a…Storage space 12c…Cutting opening 12d...Air duct 13...Frame pivot shaft 14...Drive pulley 15...Driven pulley 16…Band saw 17a, 17b...Band saw guide 18…Handle 19…Motor 19a...Main shaft 20…Cooling fan 21. Vice 22…base board 23…Fixed clamp 24…Movable clamp 25…Volts 26…Slide rod 27…Bolt 28…Clamp handle 29...Guide groove 30…Lock lever 31...Axis 32...Clamp lever 33…Guide rod 34...Guide hole 35...Guide piece 36…Lock piece 40...Processed products (pipe materials) 40a, 40c...cut end surface 40b…center line

Claims

1. The machine includes a base having a vice for fixing a workpiece, and a frame that is attached to the base so that it can be raised and lowered with the frame rotation shaft as a fulcrum. The frame is provided with a drive pulley, a driven pulley, an endless band saw wound between the two pulleys, a cooling fan for drawing outside air into the frame, and a motor for driving the cooling fan and the drive pulley, and a cutting opening is formed through which the band saw travels partially exposed, and band saw guides are provided at both the front and rear ends of the cutting opening for twisting the band saw exposed in the cutting opening so that the blade of the band saw faces downward, The frame is raised and the workpiece is fixed to the base with a vice. A band saw device that cuts a workpiece by lowering a frame onto a base and pressing a band saw blade exposed in a cutting opening against the workpiece, The vise is provided with a base, a fixed clamp and a movable clamp, The fixed clamp is fixed to the base plate, and the movable clamp is slidably mounted on the base plate to hold the workpiece between the fixed clamp and the movable clamp. The table is rotatably connected to the base by a table rotation shaft provided at one corner of the table on the fixed clamp side, A guide rod is slidably fitted to a circular arc-shaped guide hole having a curvature center on the base rotation axis formed in the base, the guide rod being vertically installed from the other corner of the base; providing a locking means for releasably locking the guide rod in the guide hole; This band saw device is characterized in that the table is rotated on a base using the table rotation axis as a fulcrum, and the guide rod is locked with a locking means, so that it is possible to select between a normal cut in which the cut end surface of the pipe material cut as a workpiece is perpendicular to the center line of the pipe material, and an oblique cut in which the cut end surface of the pipe material intersects obliquely with the center line of the pipe material.

2. A guide piece that slides against the inner peripheral surface of the guide groove and a lock piece that moves toward and away from the bottom of the guide hole are fixed to the tip of the guide rod, and a clamp lever is attached to the base end of the guide rod so as to be movable up and down. When the base is rotated, the clamp lever is pressed down to separate the lock piece from the bottom of the guide groove, and the guide piece slides along the guide groove.

2. The band saw apparatus according to claim 1, wherein when the table is fixed to the base, the clamp lever is raised to press the lock piece against the bottom of the guide groove.

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