JPS6029208A - Saw blade guide device for band saw shear - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a strain at the shearing side of a band saw, by constituting and setting up a guide plate, being somewhat smaller in thickness than that of maximum one in the band saw so as to be flush with the shearing side band saw as well as to come into contact with the band saw backside part, between guide arms. CONSTITUTION:A beltlike guide plate 16 being rather smaller in thickness than that of maximum one in a band saw 12 is locked to space between guide arms 14a and 14a with setting blocks 20 and 21, a bolt 29 and so on, while the guide plate 16 is adjusted in height by adjusting bolts 30 and 31, and then a guide piece 34 made of a cemented carbide or the like installed in the guide plate 16 is made so as to properly come into contact with a back part 12b of the band saw 12. Doing like this, the guide piece 34 is made contact with the back part 12b of the band saw 12 whereby a strain in the band saw 12 so that a strain in the band saw can be minimized.

Description

Detailed Description of the Invention (Object of the Invention/Field of Industrial Application) The present invention comprises a band saw that is wound endlessly between a pair of groove wheels and runs, and the cutting side of the band saw lies on the circumferential surface of the spur. In a band saw cutting machine that cuts by moving the band saw or by moving the object to be cut, the band saw is guided from the state and held in a cutting state where it stands upright at a predetermined angle. The present invention relates to a saw blade guide device used.

(Prior Art) In a conventional band saw cutting device of this type, as shown in FIG. Guide arms 3.3 are installed on both sides of the cutting section to guide and hold the windings lying in contact with the circumferential surface of the car 1 from a state in which they are erected by, for example, 90 degrees. This guide arm 3.3 generally has a groove 4 formed in its tip 3a as shown in FIG.
In the sliding contact 4 of the fixed sliding plate 6a fixed with pole 1-5
17a, 7a and a movable sliding plate 6b biased by a spring 8.
sliding material 7b.

7b, the band saw 2 is sandwiched from both sides, and a pressing guide roller 10 pivotally connected to the mounting member 9 is in contact with the back end surface of the band saw 2.

However, in the above conventional configuration, as shown in FIG.
When cutting the object 11 by pressing the saw blade 2 against the object 11, the saw blade 2 tilts and becomes convex at the center opposite to the object 11, as shown by the dashed line, and the guide arm 3,3
More guide car 1. Disadvantages that convex distortion tends to occur on both sides of the workpiece 11, and this distortion reduces cutting accuracy, and the tilting of the saw blade 2 due to the distortion reduces cutting efficiency or makes cutting impossible. was there. The inventors of the present invention previously filed an application (Japanese Patent Application No. 58-15266) for a device to eliminate such conventional drawbacks; It is used as

(Object of the Invention) An object of the present invention is to eliminate the above-mentioned conventional drawbacks and to prevent the occurrence of distortion on the cutting side of a band saw during cutting.

(Structure of the Invention) In the present invention, a guide plate having a thickness slightly smaller than the maximum thickness of the band saw is stretched between the guide arms, and the guide plate is on the same plane as the band saw on the cutting side. and is characterized by being in contact with the back of the band saw.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 12 is a flexible band saw made of steel or the like that is endlessly wound between a pair of guide wheels 13 and 13 and runs in the direction of the arrow.
3.13, it is guided to stand up about 90 degrees from the wrapped state where it lies in contact with 13, and is held in this upright cut state. This guide device 14 has a pair of guide arms 14a, 14a whose tips are located on both sides of the cutting section l of the bandsaw 12, and a frame 14b that connects each guide arm at its base end.
It is connected and integrated through. Numeral 15.15 is a fastener that fixes the connecting frame 1.4b and each guide arm 14a, and by loosening this fastener, both guide arms 14a are fixed.
, 14a can be arbitrarily adjusted. A guide plate 16 having a thickness slightly smaller than the maximum thickness of the band saw 12 is stretched between the guide arms 14a, 14a.

In FIGS. 2 to 4, the guide plate 16 is formed into a band shape from spring steel or tool steel, and has holes at both ends that pass through holes 17. 8... and NAND part) fA19, 19, Pro-2 20.21 is installed. For one installation, a through hole 22 is provided in the block 20,
This installation is done by fitting the block 20 into the recess 23 provided at the lower end of one of the guide arms 14a, and then fitting the shaft pin 25 across the elongated hole 24, 24 provided in the guide arm 14a and the above-mentioned through hole 22. installed. For the other mounting, a bolt member 26 protruding outward is fixed to the block 21, and the mounting rib 21 and the bolt are inserted into a recess 27 and an elongated hole 28 provided at the lower end of the other guide arm 14a. After the member 26 is fitted, the naso l-26a is screwed onto the bolt member 26 from the outer surface 14C of the guide arm 14a and tightened.

In both guide arms 14a, 14a, bolts 29 are screwed into threaded holes provided in each recess 23.27 from the front side in FIG.・2
By tightening 9, each block 2o, 21
are fixed within each recess 23.27. Also, there are recesses 23.27 on the inner surfaces of both guy i-arms 14a, 14a.
At the top end, there is an adjustment block 30°3 with a screw size.
0 is fixed and adjustment bolts 31.31 are screwed into this, and by rotating these adjustment bolts 31.31, each installation comes into contact with the top surface of the block 20.21 and is pushed down, and the guide The plate 16 can be adjusted so as to appropriately abut against the back portion 12b of the band saw 12 below. In addition, in FIG. 2, 32 is a guide roller that comes into contact with the back part 12b of the band saw 12, and in FIG.
is a sliding member that comes into sliding contact with the side surface of the band saw 12.

Referring also to FIG. 5, the guide plate 16 has a large number of guide pieces 34 made of cemented carbide or the like with slight intervals on the side 16a facing the back 12b of the band saw 12. It is fixed by "Roui" etc. The guide piece 34 is in sliding contact with the back part 12b of the traveling band saw 12, and its front side in the running direction is smoothly chamfered 34a, and the thickness of the guide piece 32 is equal to the thickness of the guide plate 16. This is approximately the same as the thickness of the back portion 12b of the band saw 12, or slightly thicker, and slightly smaller than the thickness of the straw blade portion of the band saw 12, which is not the maximum thickness.

The guide device configured as described above has bolts 29...
・With 26a slightly loosened, add 1 l.
Adjust JliJ adjustment port 1-3L 31, and remove guide piece 34.
. . uniformly abuts against the back part 12b of the band saw 12, and the band saw 1
2, and tighten the nut 26a to apply tension to the guide plate 16 so that the tension is slightly stronger than the tension of the band saw 12. At this time, guide arm 1
The recesses 23 and 27 in 4a are sufficiently large compared to the mounting block, so movement adjustment is possible.
is movable in the vertical direction along the elongated hole 24, and the bolt member 26 is similarly movable along the elongated hole 28. After adjusting the guide plate 16, tighten the bolts 29 to fix it.

According to the guide device of the above-described embodiment, the object to be cut is cut by the band saw 1.
2, the reaction force that the cutting side 1.22 of the band saw 12 receives from the object to be cut is also received by the guide plate 16, and the distortion of the band saw 12 is significantly reduced. Therefore, the cutting force applied to the workpiece by the band saw 12 can be increased, thereby increasing the cutting capacity, and since the band saw 12 is less distorted, its lifespan is extended and cutting accuracy is also improved. In addition, even if you use a band saw with a width that is one step narrower (in the vertical direction in Figure 2), you can still achieve the same or better cutting ability than the conventional band saw, so the cost of the band saw 12 can be reduced. Economical.

In the embodiment described above, the guide plate 16 is placed at the pole (-1).
Since the guide plate is attached to the block 20 and 21 by the guide plate 8, the guide plate can be easily replaced.

Further, since a large number of guide pieces 34 are fixed to the side portion 16a of the guide plate 16 so that the band saw 12 and these guide pieces 34 are in sliding contact, there is little wear and the service life is long.

Since the guide pieces 34 are fixed to the side portion 16a with a slight interval, even if a bending force is applied to the guide plate 16 when the guide plate 16 is attached/detached or stored for 1ft, the guide plate 16 will not bend appropriately. There is no inconvenience as it will be done. However, it is of course possible to omit these guide pieces 34 and have the side portions 6a of the guide plate 16 directly contact the back portion 12b of the band saw 12. In this case, it is desirable to use as hard a material as possible for the guide plate 16. and,
If the side parts 1 and 6a are hardened, they will easily break and be damaged, so care must be taken when handling them. Further, the back portion 12b of the band saw 12 may be hardened to increase its hardness.

In this case, as shown in FIG. 6, if four arc-shaped parts 35a are provided at appropriate intervals on the back part 12b and only the tips of the remaining convex parts 35b are hardened, the thickness direction of the band saw 12 It can be bent in one direction and can be wrapped between the spurs 13 and 13.

In the above-described embodiment, the guide plate 16 has a rectangular shape, but the guide plate 16 may have a shape in which the central portion of the upper side is bulged and widened. The bolt member 26 is attached to the block 21, but the bolt member 26 may be attached by providing a tapped hole in the block 21 and screwing a bolt into the hole from the outer surface 14c.

7 and 8 show another embodiment, in which the back 12b of the band saw 12 is securely brought into contact with the guide piece 34 at the center of both guide arms 14a, 14a to prevent the band saw 12 from swinging laterally. A steady rest device 36 is provided so as to be movable up and down. In particular, in FIG. 8, reference numeral 37 is a steady rest plate that can be driven up and down, and a guide I"#37a into which the guide plate 16 can be inserted is provided at the lower end, and the two guide parts 3
7b and 37c are formed, one guide part 37b
A take-off piece 37d protruding perpendicularly to the other guide portion 37c is attached to the other guide portion 37c, and a sliding contact material 38 (made of super steel alloy, etc.) that is in sliding contact with the side surface of the band saw 12 is attached. Mounting piece 3
At 7d, there is an eccentric shaft 4 provided with a roller 39 on the lower end circumferential surface.
When the roller 39 is rotated, the roller 39 is pressed against the side of the band saw 12, and the By tightening the nut 41 in this state, the band saw 12 is appropriately pinched by the roller 39 and the sliding material 38, and lateral vibration is prevented.

This steady rest device 36 has 1. Before cutting the workpiece with the band saw 12, the workpiece is removed as described above, and after the band saw 12 has cut into the workpiece to a certain extent, the band saw 12 is no longer in danger of lateral runout, so this runout can be reduced. The stop device 36 is raised and removed. Therefore, when this steady rest device 36 is used in combination, distortion of the band saw 12 by the guide plate 16 can be prevented more reliably.

(Effects of the Invention) According to the present invention, the occurrence of distortion on the cutting side of the band saw during cutting is prevented, and therefore, it is possible to make a strong cut into the object to be cut, thereby increasing the cutting capacity. Improvements in life and cutting accuracy can be expected.

[Brief explanation of drawings]

1 to 8 show embodiments of the present invention, in which FIG. 1 is a schematic front view of the entire band saw cutting machine, FIG. 2 is an enlarged front view of the saw blade guide device, and FIG. 4th cross-sectional view along mm-m line of
The figure is a sectional view taken along the line ■-■ in Figure 2, Figure 5 is an enlarged view of the guide piece, Figure 6 is a front view showing another embodiment of the band saw, and Figure 7 is a front view showing another embodiment. , Fig. 8 is an enlarged cross-sectional view taken along the line ■-■ in Fig. 7, Fig. 9 is a schematic front view of the entire conventional band saw cutting machine, and Fig. 10 is a sectional view of the main part of the saw blade guide arm. be. 12... Band saw, 12a... Cutting side, 12b... Back, 13... 4 wheels, 14a... Guide arm, 16
... Guide plate, 16a ... Side part, 34 ... Guide piece. Applicant Toshio Hara Same Nobuo Hara On the 4th day! -5N 5th (4

Claims (1)

[Claims] (l) The cutting side of the band saw, which is wound endlessly between a pair of groove wheels and travels, is brought into contact with the peripheral surface of the spur by a pair of guide arms provided on both sides of the cutting section. In a band saw cutting machine in which the winding is guided from a state and held in a cutting state in which it is erected at a predetermined angle, a guide plate having a thickness slightly smaller than the maximum thickness of the band saw is stretched over the guide arm space. . The saw blade guide device for a band saw cutting machine, wherein the guide plate is on the same plane as the band saw on the cutting side and is in contact with the back of the band saw. (2) A large number of guide pieces made of wear-resistant material are fixed to the guide plate on the side opposite to the back of the bandsaw. Blade guide device.