JPH0556319U - Band saw - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a band saw machine capable of extending the life of an endless band saw blade. [Structure] A drive wheel 19 and a driven wheel 2 that hangly support an endless band saw blade 23 on a saw blade housing 13.
1, the drive wheel 19 is rotatably driven, the driven wheel 21 is rotatably and movable in a direction of approaching and separating from the drive wheel 19, and the peripheral surface of the drive wheel 19 in the band saw blade 23 is provided. It is characterized in that a pressing roller 61 for pressing a portion contacting 19a is rotatably provided at a position close to the drive wheel 19.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a band saw machine having an endless band saw blade.

[0002]

[Prior Art]

 Explaining a conventional band saw machine with an endless band saw blade, a saw wheel housing is provided with a drive wheel and a driven wheel for supporting the endless band saw blade around, and the drive wheel is rotatably provided. In addition, the driven wheel is provided so as to be rotatable and movable toward and away from the drive wheel.

In the above structure, the driven wheel is moved closer to the drive wheel by, for example, the operation of the fluid pressure cylinder, and then the endless band saw blade is wound around the driven wheel and the drive wheel. A predetermined tension is applied to the band saw blade by moving the driven wheel in a direction away from the drive wheel by the operation of the fluid pressure cylinder. This completes the preparation for cutting the work with the band saw blade.

[0004]

[Problems to be solved by the device]

 However, in the conventional band saw machine as described above, in order to enhance the cutting ability when cutting the work, the frictional force between the band saw blade and the drive wheel peripheral surface must be increased, and the predetermined tension Needs to be increased. Therefore, there is a problem that the life of the band saw blade is shortened when trying to improve the cutting ability.

Therefore, an object of the present invention is to provide a band saw machine that can solve the above problems.

[0006]

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the first means of the present invention is, as a first means, a drive wheel for supporting an endless band saw blade on a saw blade housing. And a driven wheel, the drive wheel is rotatably driven, and the driven wheel is rotatably and movable in a direction of moving toward and away from the drive wheel. A pressing roller for pressing the contacting portion is rotatably provided at a position close to the drive wheel.

As a second means, a supporting roller that supports a portion of the peripheral surface of the drive wheel that is not in contact with the band saw blade is rotatably provided at a position close to the drive wheel.

As a third means, a rotary shaft integrally provided on one side and the other side of the drive wheel is rotatably provided on the saw blade housing.

[0009]

[Action]

 In the above structure, after the driven wheel is brought close to the drive wheel, the endless band saw blade is wound around the driven wheel and the drive wheel.

After the band saw blade is wound around the wheel, the driven wheel is separated from the drive wheel to apply a predetermined tension to the band saw blade. Further, the portion of the band saw blade that comes into contact with the peripheral surface of the drive wheel is pressed by the pressing roller.

Under the condition that the endless band saw blade is driven to rotate to drive the endless belt saw blade, the saw blade housing is moved closer to the workpiece, thereby performing a desired cutting process on the work. To do.

Under the above-mentioned action, since the contacting portion is pressed by the pressing roller, even if the predetermined tension is reduced, there is sufficient space between the band saw blade and the peripheral surface of the drive wheel. The appropriate frictional force works and the work can be cut appropriately. Further, according to the second means, since the supporting roller supports the portion of the peripheral surface of the drive wheel that is not in contact with the band saw blade, the rotation axis of the drive wheel is based on the pressing force of the pressing roller. You can reduce the power to work on. Similarly, according to the third means, the rotating shafts are provided on one side and the other side of the drive wheel, and the drive wheel is supported by the both-ends support mode. The force acting on the rotating shaft can be reduced.

[0013]

【Example】

 An embodiment according to the present invention will be described below with reference to the drawings.

Referring to FIGS. 1 and 4, a horizontal band saw machine 1 will be described as an example of a band saw machine. A work table 5 for supporting a work W is provided on a base 3 installed on a floor surface. In addition, a pair of fixed vise 7 and movable vise 9 are provided to fix the work W at a predetermined position on the work table 5. The fixed vise 7 is immovable, and the movable vise 9 is movable by a known means such as a vise cylinder (not shown) in the left and right directions (the left and right directions in FIGS. 1 and 4) approaching and separating from the fixed vise 7.

The base 3 is provided with a saw blade housing 13 that is vertically swingable via a hinge shaft 11. In order to swing the saw blade housing 13, a piston rod 17 which is capable of projecting upward from a lifting cylinder 15 pivotally supported at an appropriate position of the base 3 is connected to the saw blade housing 13 at an appropriate position. is there.

A drive wheel 19 and a driven wheel 21 are rotatably provided in the saw blade housing 13. An endless band saw blade 23 is wound around the drive and driven wheels 19 and 21. The rotary shaft 25 of the driven wheel 21 is rotatably supported by a slider 27 via a bearing 29. The slider 27 is guided by a pair of upper and lower guide rails 31 provided in the saw blade housing 13 and is movable in the left and right directions in which the slider 27 approaches and separates from the drive wheel 19. Further, a tension applying device 33 is provided which moves the slider 27 in the left-right direction to apply a predetermined tension to the band saw blade 23. The tension applying device 33 is composed of a fluid pressure cylinder provided at a position close to the driven wheel 21 in the saw blade housing 13, and a piston rod 35 of the fluid pressure cylinder 33 has a piston rod 35 at the left end of the slider 27 (see FIG. It is interlockingly connected to the left end in FIG. The band saw blade tensioning device 33 may be replaced with a fluid pressure cylinder by using other known means such as a feed screw means using a screw and a nut.

The rotating shaft 37 of the wheel 19 is rotatably supported by the saw blade housing 13 via a bearing 39, and is driven to rotate by a drive motor 41 with a reduction gear. Is becoming

Further, in order to hold the band saw blade 23 substantially perpendicular to the work W supported by the work table 5, the beam member 43 provided in the saw blade housing 13 has a pair of guide arms 45, 47. Is provided so that the position can be adjusted in the left-right direction. A plurality of saw blade guides 49, 51 for guiding and supporting the body portion of the band saw blade 23 and a rotatable backup roller 53 for guiding and supporting the back portion of the band saw blade 23 are provided at the tips of the guide arms 45, 47. , 55 are provided.

At a position close to the drive wheel 19 in the saw blade housing 13, an appropriate number of pressing rollers 57 that press a portion of the band saw blade 23 that contacts the peripheral surface 19 a of the drive wheel 19 are provided. The pressing roller 57 is rotatably supported by a clevis-shaped support member 59 via a rotating shaft 61. The supporting member 59 is integrally connected to a piston rod 65 that can project from a pressing cylinder 63 provided in the saw blade housing 13, and the pressing roller 57 is driven by the operation of the pressing cylinder 63. It is designed to be pressed toward the center of. In order to guide the pressing roller 57 toward the center of the drive wheel 19, a slide bar 67, which is kept parallel to the piston rod 65, is movable on a guide member 63a integrally provided on the pressing cylinder 63. The slide bar 67 is connected to the support member 59 from its tip.

It should be noted that instead of moving the pressing roller 57 in the pressing direction by the operation of the pressing cylinder 63, the pressing roller 57 may be moved in the pressing direction using a motor, a spring or the like.

Referring to FIGS. 1 and 2, at a position close to the drive wheel 19 in the saw blade housing 13, it is suitable to support a portion of the peripheral surface 19 a of the drive wheel 19 which is not in contact with the band saw blade 23. A number of supporting rollers 69 are rotatably provided via a rotating shaft 71. It is desirable that the support roller 69 be preloaded by using an appropriate means such as a spring, and the flange portion 19b on the peripheral surface 19a of the drive wheel 19 may be supported by the support roller 69. is there.

Instead of providing the support roller 69 as described above, as shown in FIG. 3, the rotary shaft 39 integrally provided on the rear side (lower side in FIG. 4) of the drive wheel 19 is interposed via the bearing 41. The rotary shaft 73, which is rotatably supported by the saw blade housing 13, and is integrally provided on the front side of the drive wheel 19, is rotatably supported by the saw blade housing 13 via the bearing 75. It is a thing. The bearing 75 is provided on a support bracket 77 provided on the saw blade housing 13.

The operation of this embodiment will be described based on the above configuration. When the piston rod 35 of the fluid pressure cylinder 33 is projected, the slider 27 is embedded in the guide rail 31 and moves rightward (rightward in FIG. 1). Then, the rotary shaft 25 also moves to the right through the slider 27 and the bearing 29, so that the driven wheel 21 approaches the drive wheel 19.

After the driven wheel 21 is brought close to the drive wheel 19, an endless band saw blade 23 is wound around the drive and driven wheels 19, 21. At this time, the lower portion of the band saw blade 23 that is wound around is sandwiched by the saw blade guides 51 and 53.

Then, the piston rod 35 of the fluid pressure cylinder 33 is appropriately moved to the left to separate the driven wheel 21 from the drive wheel 19, thereby applying a predetermined tension to the band saw blade 23. Further, when the pressing cylinder 63 is operated to cause the piston rod 65 to project, the pressing roller 57 can press the portion of the band saw blade 23 that comes into contact with the peripheral surface 19a of the drive wheel 19. Further, the saw blade guides 49 and 57 are rotated so that the edge of the band saw blade 23 located in the cutting region is oriented perpendicular to the work W 1.

Then, by driving the drive motor 41, the driving and driven wheels 19 and 21 are rotated to drive the band saw blade 23 to travel, and the lifting cylinder 15 is appropriately operated to move the saw blade housing 13 downward. Rock. As a result, the work W is cut by the band saw blade 23 that is vertically guided to the work W through the pair of saw blade guides 51 and 53. At this time, since the pressing roller 57 presses the contacting portion, a sufficient frictional force is generated between the band saw blade 23 and the peripheral surface of the drive wheel 19 even if the predetermined tension is small. It works and can appropriately cut the work W. In addition, since the supporting roller 69 supports the portion of the peripheral surface 19a of the drive wheel 19 that the band saw blade 23 does not contact, the rotary shaft 61 of the drive wheel 21 is rotated by the pressing force of the pressing roller 69. The working power can be reduced. Similarly, since the rotary shafts 37 and 71 are provided on the rear side and the front side of the drive wheel 19 to support the drive wheel 19 in the form of supporting both ends, one rotary shaft is based on the pressing force of the pressing roller 57. The force acting on 37 (or 71) can be reduced.

According to the present embodiment as described above, since the pressing roller 57 presses the portion of the band saw blade 23 that comes into contact with the peripheral surface 19a of the drive wheel 21, the tension applied to the band saw blade 23 is reduced. Even so, a sufficient frictional force is exerted between the band saw blade 23 and the peripheral surface 19a of the drive wheel 19 for performing an appropriate cutting process. Therefore, the life of the band saw blade 23 can be extended.

Further, since the support roller 69 supports a portion of the peripheral surface 19 a of the drive wheel 19 which is not in contact with the band saw blade 23, or supports the drive wheel 19 in the form of both ends support, the pressing roller The force acting on one rotating shaft 37 (or 71) can be reduced based on the pressing force of 57. Therefore, the strength of the bearing 39 (or 75) supporting the rotating shafts 37, 71 can be reduced.

It should be noted that the present invention is not limited to the above description of the embodiments, but can be implemented in various other modes by making appropriate changes.

[0030]

[Effect of the device]

 As can be understood from the above description of the embodiments, according to the present invention, the tension applied to the band saw blade in order to press the portion of the band saw blade that comes into contact with the peripheral surface of the drive wheel with the pressing roller. Even with a small value, a sufficient frictional force acts between the band saw blade and the peripheral surface of the drive wheel to perform an appropriate cutting process. Therefore, the life of the band saw blade can be extended.

According to the second means and the third means, in addition to the above effects, the force acting on the rotary shaft of the drive wheel based on the pressing force of the pressing roller can be reduced, and the rotary shaft is supported. The strength of the member to be used can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a main part in this embodiment.

FIG. 2 is a partial bottom view of a main part in the present embodiment.

FIG. 3 is a partial bottom view of a main part in the present embodiment.

FIG. 4 is a front view of a horizontal band saw machine.

[Explanation of symbols]

 1 Horizontal Band Saw Machine 13 Saw Blade Housing 19 Drive Wheel 21 Driven Wheel 23 Band Saw Blade 61 Pressing Roller 69 Support Roller 37, 73 Rotating Shaft

Claims (3)

[Scope of utility model registration request] 1. A saw blade housing is provided with a drive wheel and a follower wheel for hanging and supporting an endless band saw blade, the drive wheel being rotatably provided, and the follower wheel being rotatable and close to the drive wheel. A band saw machine, comprising a pressing roller movably provided in a separating direction and pressing a portion of the band saw blade that comes into contact with a peripheral surface of the drive wheel so as to be rotatable at a position close to the drive wheel. 2. A support roller for supporting a portion of the peripheral surface of the drive wheel that is not in contact with the band saw blade is rotatably provided at a position close to the drive wheel. Band saw machine. 3. The band saw machine according to claim 1, wherein a rotary shaft integrally provided on one side and the other side of the drive wheel is rotatably provided on the saw blade housing.