JPH0410975Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an automatic pipe cutting machine that cuts a tubular workpiece with a disc-shaped cutter.

(Prior Art) A conventional automatic pipe cutting machine of this type includes, for example, a pipe cutting device disclosed in Japanese Patent Application Laid-Open No. 52-96483. In this device, a cutter mounting member rotatably attached to the main body is provided with an appropriate number of guide parts in a direction perpendicular to its axis, and a slide bracket rotatably supports a disc-shaped cutter on the guide parts. is slidably mounted, and the feed of the cutter operates a piston of an annular cylinder mechanism attached to the outer peripheral edge of the main body, and one end of the cutter is inserted into a circumferential groove on the inner peripheral surface of the piston via a roller. This is accomplished by sliding the slide bracket by the other end of the bell crank, which is engaged with the other end of the bell crank.

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional configuration, the connection between the other end of the bell crank and the arm portion of the slide bracket is by a pin, which causes significant wear, and the pipe that needs to be cut is In order to strongly press the cutter against the blade, the cylinder mechanism must have a large diameter, which poses problems such as the cylinder mechanism becoming expensive.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above problems. The cutter part has a plurality of disc-shaped cutters rotatably mounted on the front end surface of a face plate whose outer peripheral surface is rotatably supported in the casing through a cutter base and The chuck portion is arranged so as to be slidable in the radial direction of the face plate, and the chuck portion has a cylindrical chuck having a chuck mechanism at the front end that penetrates the center portion of the face plate, and a cylindrical chuck that is fixed to the casing at the rear end. A first cylinder is attached to the rear end of the chuck for expanding and contracting the chuck mechanism to grip and release a tubular workpiece inserted into the hollow hole of the chuck, and the cutter rotation drive section A cylindrical rotating shaft is rotatably fitted on the outside of the chuck portion, and the cutter feeding portion includes a slider having an annular groove on the outer peripheral surface and a conical surface on the boss portion. A second cylinder is fitted to the outer peripheral surface of the shaft so as to be slidable and rotatable together, and has a tapered surface at the tip of the piston rod, and is fixed to the casing, and one end is pivotably attached to the casing. A second arm having a roller pivotally supported at the other end of the first arm is fitted into the annular groove and is always in contact with the tapered surface, and whose central portion is swingably pivoted around the outer periphery of the rotating shaft. It is characterized in that rollers pivotally supported at both ends of the cutter are in constant contact with the conical surface and the outer end surface of the front cutter base, respectively.

(Function) In the above configuration, the cutter is fed by operating the second cylinder and moving the first cylinder by the tapered surface of the piston rod.
Swing the arm to slide the slider forward,
This is done by swinging the second arm using the conical surface of the slider and sliding the cutter base in the direction of the workpiece. At this time, the tapered surface, conical surface, and outer end surface of the cutter base are in continuous contact with the rollers of the first and second arms, so there is no impact, and therefore wear is significantly reduced. Since the wedge effect is utilized, the work pressing force of the cutter can be increased without increasing the diameter of the second cylinder.

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

The automatic pipe cutting machine 1 of this embodiment includes a cutter section 2, a chuck section 3, a cutter rotation drive section 4, and a cutter feed section 5.

The cutter part 2 has two cutters 9 facing each other on the front end surface of a face plate 8 whose outer peripheral surface is rotatably supported on the front wall 6a of the casing 6 via a bearing 7.
is rotatable via the cutter base 10 and the face plate 8
It is arranged so as to be slidable in the radial direction. Face plate 8
The outer shape is circular and rectangular, and the disc part 8a and the cylindrical part 8
It consists of b. The cutter 9 is disk-shaped and has a cutting edge on its periphery, and is rotatably attached to a cutter shaft 9c by a cutter presser foot 9a and a cutter release spring 9b. The cutter shaft 9c is detachably fixed to the cutter stand 10. The cutter stand 10 is slidably fitted between a pair of guides 8c fixed to the disk portion 8a in the radial direction via liners 10a fixed to both sides.

In the chuck part 3, a piston part 12a formed on the outer peripheral surface of a chuck support cylinder 12 is slidably inserted into an inner peripheral surface 11a of a first cylinder 11 fixedly installed on the rear wall 6b of the casing 6. A chuck 13 is inserted into the inner peripheral surface 12b of the cylinder 12. The first cylinder 11 is hydraulic, and has oil supply holes 11b and 11c opened on the inner circumferential surface 11a on both sides of the piston portion 12a. The chuck support cylinder 12 has a conical surface 1 at the tip of the inner peripheral surface 12b.
2c is formed, and the outer circumferential surface 1
3a is slidable. Check 13
has a cylindrical shape, and has a workpiece insertion port 13c at its rear end and a chuck mechanism 13d at its tip, and its rear end is fixed to the rear end surface of the first cylinder 11. The chuck mechanism 13d is formed with a plurality of slits 13e in the axial direction and a conical surface 13f on the outer peripheral surface 13a, and when the conical surface 13f is pressed by the conical surface 12c of the chuck support cylinder 12, it becomes elastic so that it can expand and contract. transform.

The cutter rotation drive section 4 includes a chuck support cylinder 12
A rotating shaft 15 loosely fitted rotatably on the outside of the casing 6 via a bearing 14 is attached to the intermediate wall 6c of the casing 6 via a bearing 16 so as to be rotatable together with the face plate 8.
It is rotatably supported. The rotating shaft 15 has a cylindrical shape, has a plurality of grooves 15a formed in the axial direction on its outer peripheral surface, and has a belt pulley 15b fixed to its rear end. Belt pulley 15b and external electric motor 1
A belt 18 is hung between the belt pulley 17a and the belt pulley 17a.

The cutter feeding section 5 includes a slider 19 fitted on the outer peripheral surface of the rotating shaft 15 and both side walls 6 of the casing 6.
d, one end of which is pivotally attached to the casing 6, a second cylinder 21 fixed to the upper wall 6e of the casing 6, a tuning mechanism 22, and a rotating shaft 1.
The second arm 23 includes a second arm 23 whose central portion is pivotally attached to a bracket portion 15c formed at a position corresponding to the cutter 9 on the outer periphery of the second cylinder 21, and a detection device 24 attached to the second cylinder 21. Slider 19
has a circular rectangular outer shape and consists of a boss portion 19a, a disk portion 19b, and a cylindrical portion 19c, and the boss portion 19a
A conical surface 1 is provided on the outer peripheral surface of the and cylindrical portion 19c, respectively.
9d and a tubular groove 19e are formed, and a groove 19g that engages with the groove 15a is formed in the center hole 19f of the boss portion 19a, and is fitted into the rotating shaft 15 so as to be able to slide and rotate together. The inner circumferential surface of the cylindrical portion 19c is slidably fitted onto the outer circumferential surface of the cylindrical portion 8b. The disk portion 19b is biased in a direction away from the disk portion 8a by two compression springs 25 interposed between the disk portion 19b and the disk portion 8a. Two rollers 20a and 20b are coaxially and rotatably attached to the tip of the first arm 20, and the roller 20a is slidably fitted into the annular groove 19e. The second cylinder 21 is hydraulic and has a taper guide 26 attached to the tip of the piston rod 21a. The tapered guide 26 has a reverse groove shape, and both legs have a tapered surface 26a at the tip, a guide groove 26b at the rear, and a rack 26c at the front. A roller 20b is constantly in contact with the tapered surface 26a due to the action of a compression spring 25, and the guide groove 26b is in contact with a roller 26d rotatably mounted on both side walls 6d to guide the upward and downward movement of the tapered guide 26. The tuning mechanism 22 is provided with a rack 26c at both ends of a pinion shaft 22a whose both ends are rotatably supported by the side wall 6d.
A pinion 22b that meshes with is fixedly provided. A roller 23a that is in constant contact with the conical surface 19d is rotatably attached to one end of the second arm 23, and a roller 23b that is in constant contact with the outer end surface of the cutter base 10 and rollers 23c on both sides of the roller 23b are attached to the other end of the second arm 23. is rotatably mounted on the same axis. Two tension springs 27 are interposed between the axes of both rollers 23a, and bias the rollers 23a in a direction that always brings them into contact with the conical surface 19d. In addition, the roller 23c and the cutter stand 1
0, two tension springs 28 are interposed between the rollers 23b and the cutter base 10, and urge the rollers 23b in a direction in which the rollers 23b are always brought into contact with the outer surface of the cutter base 10. Detection device 24
, an inverted U-shaped detection rod 24a attached to the taper guide 26, and an upper wall 6e corresponding to the detection rod 24a.
It consists of two upper and lower sensors 24b and 24c attached to the.

Next, the operation of the automatic pipe cutting machine 1 of this embodiment will be explained.

First, start the electric motor 17 and pull the belt pulley 17.
a. The rotating shaft 15 is rotated via the belt 18 and belt pulley 15b. The rotating shaft 15 causes the slider 19 and the face plate 8 to rotate together, and the cutter 9 revolves. The chuck support cylinder 12 and the chuck do not rotate. Next, the tubular workpiece 29 to be cut is inserted into the chuck 13 through the insertion port 13c, and is caused to protrude forward from the cutting edge of the cutter 9 by a desired cutting length. When pressure oil is supplied into the first cylinder 11 from the oil supply port 11b, the chuck support cylinder 12 is pushed forward via the piston portion 12a, and the conical surface 12
c presses the conical surface 13f. Chuck mechanism 13
d contracts and grips the workpiece 29. Next, the second
Pressure oil is supplied to the cylinder 21, and the taper guide 26
descend. At this time, both legs of the tapered guide 26 are connected by the pinion shaft 22a via the rack 26c and the pinion 22b, so they descend simultaneously. The tapered surface 26a causes the first arm 20 to swing forward via the roller 20b, and the roller 2
0a, the slider 19 is slid forward against the compression spring 25. The conical surface 19d is the roller 2
3a, the second arm 23 is swung against the tension spring 27, and the cutter stand 10 is slid in the direction of the workpiece 29 via the roller 23b on the opposite side. 1
The pair of cutters 9 contact the workpiece 29 while revolving, and push off the workpiece 29 while rotating. At the same time, the lower sensor 24c detects the detection rod 24a, switches the pressure oil to the second cylinder 21 in the opposite direction, and raises the taper guide 26. Upper sensor 24b
detects the detection rod 24a, stops the supply of pressure oil to the second cylinder 21, and stops the taper guide 26. The slider 19 returns to its original position together with the first arm 20 due to the restoring force of the compression spring 25. The second arm 23 returns to its original position due to the restoring force of the tension spring 27, and pulls the cutter base 10 back to its original position via the tension spring 28. Katsuta 9 also returns to its original position. Finally, pressure oil is supplied to the oil supply port 11c, and the pressure oil on the opposite side is discharged from the oil supply port 11b. The chuck support cylinder 12 is retracted to its original position via the piston portion 12a, and the pressure of the conical surface 13f is released. The chuck mechanism 13d expands to its original shape and releases the workpiece 29. Thus,
The cutting operation is completed once, and then the above operation is repeated.

(Effects of the invention) Since the invention is configured as described above,
In the cutter feeding section, the tapered surface of the second piston, the conical surface of the slider, and the outer end surface of the cutter base are in continuous contact with each other through the action of the rollers and springs of the first and second arms, and no impact is generated. Therefore, wear is significantly reduced and the life of the device is extended. In addition, since the workpiece pressing force of the cutter utilizes the wedge action of the tapered surface and the conical surface, it can be made strong without increasing the diameter of the second cylinder, which is economical.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of an automatic pipe cutting machine showing an embodiment of the present invention, and FIG. 2 is a side sectional view of FIG. 1. 1... Automatic pipe cutting machine, 2... Cutting section, 3
...chuck part, 4... cutter rotation drive part, 5...
...Katsu feeder, 6...Casing, 8...Face plate, 9...Katsuta, 10...Katsuta stand, 11...
1st cylinder, 13...chuck, 13d...chuck mechanism, 15...rotating shaft, 19a...boss portion, 19d...conical surface, 19e...annular groove, 20
...First arm, 20a...Roller, 20b...
Roller, 21...Second cylinder, 21a...Piston rod, 23...Second arm, 23a...Roller, 23b...Roller, 26a...Tapered surface, 2
9...Work.

Claims (1)

[Scope of utility model registration request] An automatic pipe cutting machine for a tubular workpiece comprising a cutter part, a chuck part, a cutter rotation drive part, and a cutter feed part, wherein the cutter part has a face plate whose outer peripheral surface is rotatably supported in a casing. A plurality of disc-shaped cutters are disposed on the front end surface so as to be rotatable via a cutter base and slidable in the radial direction of the face plate, and the chuck portion passes through the center of the face plate. A cylindrical chuck having a chuck mechanism at its front end is fixed to the casing at its rear end, and the chuck mechanism expands and contracts to grip and release the workpiece inserted into the hollow hole of the chuck. A cylinder is attached to the rear end of the chuck, and the cutter rotation drive section includes a cylindrical rotating shaft that is rotatably driven together with the face plate and is loosely fitted to the outside of the chuck, and In the cutter feeding section, a slider having an annular groove on the outer circumferential surface and a conical surface on the boss portion is fitted on the outer circumferential surface of the rotary shaft so as to be able to slide and rotate together with the slider, and a slider having a tapered surface on the tip of the piston rod. A second cylinder is fixed to the casing, one end of which is pivotally supported by the other end of a first arm, which is pivotally connected to the casing, and the roller is fitted into the annular groove and constantly in contact with the tapered surface. A roller pivotally supported at both ends of a second arm whose central portion is swingably pivoted to the outer periphery of the rotating shaft is in constant contact with the conical surface and the outer end surface of the cutter base, respectively. An automatic pipe cutting machine characterized by: