JPS59142020A - Saw tooth guide device for band saw shear - Google Patents

Abstract

PURPOSE:To prevent a band saw from being strained and maintain high cutting accuracy by providing a strain correcting wheel which meshes with each saw tooth of said band saw at the peripheral surface. CONSTITUTION:A strain correcting wheel 27 is installed in a position corresponding to a guide roller 19a, in a mounting base board 17. The correcting wheel 27 is meshed with the tooth part 20b of a band saw 12 by means of a plural number of engaging pins 32, and rotates in accordance with the run of the band saw 12. The plural number of engaging pins are fitted in the tooth bottom of the band saw 12 one after another. Since each engaging pins 32 has a notched part on the rear side with respect to the rotating direction of the correcting wheel 27, the strain of the band saw 12 is prevented from occurring even though the tip of the each tooth 20b of the band saw is curved and projected forwardly in the advancing direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention, Industrial Application Field) The present invention comprises a band saw that is endlessly wound between conductive pairs and travels, and the cutting side of the band saw lies on the circumferential surface of the conductive material. In a band saw cutting machine that cuts by moving the object to be cut, the cutting position of the band saw is adjusted to the appropriate position. □Relates to a saw blade guide device used to hold the saw blade in place.

(Prior art, its problems and technical analysis) In a conventional band saw cutting device of this kind, as shown in FIG.
Guide arms 3.3 are installed on both sides of the cutting section to guide and hold the cutting side 2a of the cutting section 2a from the state in which the winding is in contact with the peripheral surface of the spur l to the cutting state in which it is erected at 90 degrees, for example. . Generally, the guide arms 3, 3 are fitted with a bolt 5 within a groove 4 formed in the tip 3a as shown in FIG.
Sliding materials 7a, 7a of the fixed sliding plate 6a fixed with
The band saw 2 is sandwiched between the band saw 2 from both sides, and a pressing guide roller 10 pivotally connected to a mounting member 9 is brought into contact with the back end surface of the band saw 2.

However, in the above-mentioned conventional configuration, as shown in FIG. 1, when the saw blade 2 is pressed against the object 11 to cut it, the saw blade 2 is tilted and covered at the center as shown by the dashed line. Cut object 1
It is easy to create a distortion that is convex on the opposite side to 1 and convex toward the object to be cut 11 on both sides of the guide arms 3, 3 with a conductivity closer to 1.1, and this distortion reduces cutting accuracy. In addition, there is a drawback that the saw blade 2 tilts due to distortion, resulting in a reduction in cutting efficiency or inability to cut. Furthermore, in order to maintain a predetermined cutting accuracy and to prevent the occurrence of the above-mentioned distortion as much as possible, the band saw 2 applies very strong pressure between the two sliding plates 6a and 6b, and for this reason, the pressure at the pinched portion is The sliding resistance is extremely large, and a considerable proportion of the driving force for driving the band saw 2 is consumed in resisting the sliding resistance. On the other hand, a structure has also been proposed in which pressure rollers are used instead of the sliding plates 6a and 6b and the band saw 2 is sandwiched between both rollers, but this makes the guiding direction of the band saw 2 unstable and the posture cannot be maintained sufficiently. Instead, the occurrence of distortion and the decrease in cutting accuracy become more noticeable.

(Technical Problem of the Invention) The technical problem of the present invention is to solve the above-mentioned conventional drawbacks,
The purpose of this project is to investigate a structure that prevents the occurrence of distortion, and to greatly reduce the resistance of the posture-holding parts that clamp the band saw from both sides.

(Technical Means) The first technical means of the present invention for solving the above-mentioned problem is a winding 14 in which the cutting side of a band saw that is endlessly wound between a pair of groove wheels and travels lies down and contacts between the groove wheels. In a band saw cutting machine that is guided from a cut state and held in an upright position at a predetermined angle, there are provided on both sides of the cutting section of the band saw, standing position holding members that sandwich the band saw from both sides, and a back end surface of the band saw. A pushing guide member that comes into contact with the band saw is provided, and at least one side of the cutting section is provided at a position closer to the guiding wheel than the pushing guide member, and is engaged with each cutting edge of the band saw on the circumferential surface to correct distortion by rotating 1°. It is characterized by a ring.

A second technical means of the present invention is a structure of the technical means of the first invention, in which the band saw is held on both sides between the sliding member and the pressing guide roller as a structure for maintaining the upright posture of the band saw. It is characterized by a G-shape that allows it to be pinched from the inside.

(Operation of technical means) In the first aspect of the present invention, the distortion correction ring that engages each cutting edge of the band saw on the circumferential surface is arranged at a position closer to the guide wheel than the pressing guide member that comes into contact with the back end surface G of the band saw. Therefore, even if the band saw tries to produce a distortion as shown by the dashed line in the first figure at the center and both sides of the guide member, the distortion correction ring will prevent the distortion from deforming at least on one side. This also prevents distortion and deformation of the central portion, since the above-mentioned distortion occurs in the central portion and both side portions as one unit.

On the other hand, in the second aspect of the present invention, in addition to the above-mentioned effect, the band saw is sandwiched between the sliding material and the pressing guide roller, so that the guide directionality of the band saw is controlled by sliding on one side. The resistance of the pinching part is halved by rolling contact with the roller on the other side.

(Special Effects of the Invention) In the first invention, when cutting an object to be cut, as described above (since no distortion occurs, there is no risk of a decrease in cutting efficiency or the inability to cut), and the cutting accuracy is improved. Further, in the second invention, in addition to the above-mentioned effects, the torque of the drive source such as the motor that drives the band saw can be reduced by halving the sliding resistance in the upright posture holding part of the band saw. This brings about effects such as miniaturization, energy saving, and cost reduction of the entire device, and further improves cutting accuracy.

(Example) In FIG. 1, 12 is a flexible band saw made of steel or the like that is endlessly wound between a pair of guide wheels 13, 13 and runs in the direction of the arrow, and the cutting side 12a is connected to the saw blade guide device 14. Guide car 1
3. The winding that lies in contact with 13 is guided to stand up about 90 degrees from the state and is held in this upright cut state. This guide device 4 has two 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 the base ends of the two guide arms 14a, 14a.
It is connected and integrated through. 15. Numeral 15 is a fastener that fixes the connecting frame 14b and each guide arm 14a, and by loosening this fastener, both guide arms 14a are fixed.
, 148 can be arbitrarily adjusted.

2 to 6 do not show the structure of the tip end of each guide arm 14a of the saw blade guide device 14. At the tip of the guide arm 14a, there is a mounting board part 1 in the shape of an abbreviation, which has a protrusion part 16a that extends toward the guide wheel 13 side and protrudes downward in the figure at the extended end.
6, and a mounting plate 17 that protrudes from the mounting base plate portion 16 toward the back of the band saw 12. However, mounting plate 1
7 has support shafts 18 a and 18 b via bearings.
, 18c are respectively attached to pressing guide rollers 19a, 19b, and 19c rotatably pivoted, and the guide roller 19a is connected to the other guide rollers 19.
The guide rollers 19a, 19c are located slightly away from the guide wheel 13 side from the back portion 20a of the band saw 12.
The guide roller 1 is in contact with the peripheral edge 21a of the side surface, and the guide roller 1
9b is in contact with the side surface peripheral portion 21 of the band saw 12 near the blade portion 2Ob. On the other hand, on the mounting board 16, there is a sliding plate 22 fixed with a sliding contact material 22.22a made of cemented carbide or the like that slides on the back side of the band saw 12 at the position where each guide roller 19a, 19b, 19c contacts. 22b. In addition, each guide roller 19 a + 19 b +
19c are both eccentric so that the rotation center PI of the roller 19 is shifted by S with respect to the rotation center PI of the support shaft 18, as shown in FIG. After inserting the band saw 12 with a slightly wider gap between the roller 19 and the sliding contact material 22a,
It is configured such that it is possible to forcefully press the band saw 9 against the surface of the band saw 12 and to adjust the pressing force. 23...
- indicates a fixed Nando. Reference numeral 24 denotes a pressing guide roller which is attached to the mounting base plate 16 at a position closer to the center than the guide roller 19c, which is rotatably attached to the support shaft 25 through a hair ring, and which is attached to the back of the band saw 12. 20a to prevent the band saw 12 from moving upward in the drawing.

26 is a mounting nut.

On the other hand, a distortion correction wheel 27 is attached to the protruding portion 16a of the mounting board portion 17 at a position corresponding to the guide roller 19a. As shown in FIGS. 6 and 7, this correction ring 27 includes a base plate portion 27a rotatably supported on a support shaft 28 via bearings 29 and 29, and a mounting port 30 on the front surface of the base portion 27a. An annular groove 31 is formed on the circumferential surface of the base plate part 27a, and correction wheels 2 are formed in the annular groove 31 at predetermined intervals in the circumferential direction.
Engagement pins 32 . Each retaining pin 32 is connected to the correction wheel 2 as shown in the sixth figure.
The notch 32a of the cutting line along the approximately radial direction of the correction ring 27
The annular groove 31 is formed in the base plate part 27a through a long hole 33 bored in the outer plate part 27b, and the annular groove 31 is inserted into the hole 34. This engagement pin 32 is prevented from moving in the rotational direction by the width of the elongated hole 33 and the locking pin 35 that penetrates in the radial direction from the circumferential surface of the outer plate portion 27b.

According to the above configuration, the cutting side 12a of the band saw 12 has three guide rollers 19 arranged in a triangular shape on both sides of the cutting section p.
a, 19b, and 19c to slide against the sliding contact material 22a of the sliding plate 22, thereby reliably maintaining the standing posture. When the material to be cut (not shown) comes into contact with the band saw 12 and enters the cutting state, the guide roller 24 moves the cutting side 12a of the band [12].
Prevents the whole thing from shifting in the opposite direction. Therefore, when the band saw 12 is held in the upright position, only one side of the band saw 12 comes into sliding contact with the sliding contact material 22a, so the resistance is reduced by approximately half compared to a structure where both sides are in sliding contact. In addition, guide rollers 19b, 19C
may be arranged so as to face each other at the same position without shifting their positions.

On the other hand, the distortion correction wheel 27 is engaged with the blade portion 20b of the band saw 12 by the engagement pins 32, and rotates as the band saw 12 travels. The arrangement interval of the above-mentioned engagement pins 32... is the band saw 1
It corresponds to the pitch interval of the blades 36a of No. 2, and the engagement pin 3
2... are adapted to fit into the blade bottom 36b of the band saw 12 in sequence. Therefore, since each retaining pin 32 has a notch 32a on the rear side in the rotational direction of the distortion correction ring 27, the blade 36a of the band saw 12 curves forward in the forward direction even though the tip of the blade 36a of the band saw 12 is curved and protrudes forward in the traveling direction. It engages the tip without contact. Due to the existence of this correction wheel 27, even if the band saw 12 is subjected to an integral distortion as shown by the dashed line in the first figure during the cutting operation, the conductor 13 and the guide roller 2
Since the above distortion is prevented by the correction wheel 27 in the area between 4 and 4, no distortion occurs in the central portion. Note that the distortion correction wheel 27 may have a gear structure in which gear blades formed on the circumferential surface engage with each other instead of engaging with the engagement pin 32. Further, although the distortion correction wheels are provided on both sides of the cutting section in the above embodiment, a large distortion prevention effect can be obtained even if the distortion correction wheels are provided only on one side.

[Brief Description of the Drawings] Figures 1 to 6 show an embodiment of the present invention, in which Figure 1 is a schematic front view of the entire band saw cutting machine, and Figure 2 is a part of the saw blade guide device. 3 is a bottom view of the main part of the pressing guide roller portion, FIG. 4 is a partially sectional side view of the saw blade guide device, and FIG. 5 is a cutaway side view of the main part of the distortion correction ring. Fig. 6 is a partially cutaway enlarged front view of essential parts showing the meshing state of the band saw and the distortion correction shaft, Fig. 7 is a schematic front view of the entire conventional band saw cutting 1fitla, and Fig. 8 is a diagram of the saw blade guide arm. FIG. 3 is a cross-sectional view of main parts. 12... Band saw, 12a... Cutting blade, 13... Conductivity, 14... Saw blade guide device 1.19 a, 19
b, 19 c-pressing roller, 22a... sliding contact material, 24... pressing guide roller (pressing guide member)
, 27...distortion correction wheel, 36a...blade. Applicant Toshio Hara Nobuo Hara

Claims (2)

[Claims] (1) The cutting side of the band saw, which is endlessly wound between the conductor pair and travels, is brought into contact with the circumferential surface of the conductor in a lying state and is held in a cutting state in which it is erected at a predetermined angle. In the band saw cutting machine, on both sides of the cutting section of the band saw, an upright posture holding member that clamps the band saw from both sides and a corresponding guide member that comes into contact with the back end face of the band saw are provided,
A band saw cutting machine characterized in that a distortion correction ring that rotates and meshes with each blade edge of the band saw on the circumferential surface is provided at a position closer to the guide wheel than the pressing guide member on at least one side of the cutting section. Saw blade guide device. (2) The cutting side of the band saw running with endless G tomoe winding between the conductor pairs lies down and touches the circumferential surface of the conductor. In a band saw cutting machine, there are provided on both sides of the cutting section of the band saw, an upright posture holder that holds the band saw between a sliding contact material and a pressing roller from both sides, and a pressing guide that comes into contact with the back end surface of the band saw. In addition to providing a distortion correction ring that rotates by meshing with each cutting edge □ of the band saw on the circumferential surface, the cutting section is provided with a distortion correction ring at a position closer to the guiding wheel than the pressing guide member on at least one side of the cutting section. Features a saw blade guide device for band saw cutting machines.