JPH06315767A - Operation stand moving mechanism in tube cutting machine - Google Patents

Abstract

PURPOSE:To eliminate the error caused on the back rush of an engaging part and to cut a composite curve like subject with the remarkably high precision by providing a screw cylinder engaging to a screw bar arranged parallel with a track on a moving stand and moving following to the rotation of this screw on an operation stand providing a cutting means. CONSTITUTION:A moving stand 11 is moved on a track 6 by rotating, at first, a pinion 8 engaging to a rack 7 with a servo motor, an operation stand 15 mounted on the moving stand 11 is moved until the neighborhood of the cutting place of a tube. Then when a screw bar 12 is rotated by driving the servo motor, a screw cylinder 14 engaged to the above is advanced with screwing, because a cutting means provided on the operation stand 15 reaches accurately to a prescribed position of the cutting operation, the tube cutting operation is began while rotating the tube end gripping means 3 in this state. The movement of the operation stand 15 in this time is precisely executed with the forth and back motion caused on the rotation of the screw bar 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for moving a work table equipped with a cutting head in an automatic cutting machine for a relatively large-diameter and long pipe supported on a machine table.

[0002]

2. Description of the Related Art Conventionally, a work table provided with a cutting head of a pipe cutting machine of this kind is driven by rotating a pinion which meshes with a rack arranged parallel to a holding table for a pipe to be cut. However, in the case of the rack and pinion mechanism, since the backlash is relatively large, there is a problem in maintaining accuracy when a secret and complicated curved cutting is required.

On the other hand, in the case of cutting a pipe having a relatively large diameter and a long length as described above, all the movements of the workbench equipped with the cutting torch are carried out by precise feeding means with almost no backlash. When implemented, there was a problem in that it took too much time to move the workbench to a predetermined position.

[0004]

SUMMARY OF THE INVENTION In the present invention, first, the workbench is moved rapidly to a position near the work position by using a rack and pinion mechanism, and thereafter, a precision screwing operation including a screw rod and a screw cylinder is performed. According to the means, it is intended to solve the above-mentioned various points by a mechanism for moving the workbench in a fine and highly accurate manner.

[0005]

That is, the present invention is directed to a pinion which meshes with a rack arranged along a long track set parallel to a pipe to be cut which is supported for holding on a machine base. Means for moving the movable base on the orbit with the rotation of the screw rod and a screw rod arranged on the movable base in parallel with the orbit to move with the rotation of the screw rod. The present invention proposes a workbench moving mechanism in a pipe cutting machine, which is provided on a workbench provided with.

[0006]

In the mechanism of the present invention having the above-mentioned structure, the movable table on which the work table is mounted is moved to the work position by the rack and pinion mechanism, and then the screw cylinder is rotated by the rotation of the screw rod. By the precise movement, the cutting head provided on the work table is finely and precisely moved toward a predetermined work place.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. The pipe cutting machine 1 has a machine base 2 and
A pipe end gripping means 3 formed at one end of the machine base 2;
A holder 5 for rotatably supporting a pipe 4 to be cut, which is arranged on the machine base 2 at appropriate intervals;
Therefore, a pair of long tracks 6 set parallel to the pipe 4 over substantially the entire length of the machine base 2 and a pinion 8 that meshes with a rack 7 arranged along the tracks 6 are supported. A movable base 11 which moves on the track 6 via wheels 10 by being rotated by a motor 9.

A screw rod 12 is rotatably arranged on the movable base 11 in parallel with the track 6 by a servomotor 13, and a screw cylinder 14 screwed onto the screw rod 12 is provided. The work table 15 provided with the above moves on the movable table 11 via wheels 16.

A cutting means 18 including a cutting head 17 is attached to the work table 15 to perform the necessary cutting work on the pipe 4.

In the workbench moving mechanism of the present invention having the above-described structure, first, the pinion 8 meshing with the rack 7 is rotated by the servomotor 9 to move the movable table on the track 6. 11 is moved to move the work table 15 mounted on the movable table 11 to the vicinity of the cutting point of the pipe 4.

When the screw rod 12 is rotated by driving the servo motor 13, the screw cylinder 14 screwed into the screw rod 12 is advanced, whereby the cutting means provided in the work table 15 is rotated. Since 18 reaches the predetermined cutting work position accurately, the pipe cutting work is started while rotating the pipe end holding means 3 in this state.

The pipe cutting work is performed in advance by a computer.
The work table 15 is moved according to a program set by the operator, and the groove of the cutting head 17 is displaced. At this time, the work table 15 is all moved by rotating the screw rod 12. This is precisely performed by the forward / backward movement of the cylinder 14.

[0013]

By adopting the above-mentioned mechanism of the present invention, the engagement portion experienced when the cutting head is moved during the pipe cutting operation by the conventional rack and pinion mechanism. It eliminates errors due to backlash and enables complicated curved cutting with extremely high accuracy.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a mechanism of the present invention with a pipe cutting machine partially omitted.

FIG. 2 is a plan view of a portion shown in FIG.

FIG. 3 is a rear view of the portion shown in FIG.

[Explanation of symbols]

 2 machine stand 5 holding stand 6 track 7 rack 8 pinion 11 movable stand 12 screw rod 14 screw cylinder 15 working table 18 cutting means

Claims (1)

[Claims] A movable base that moves along the orbit along with the rotation of a pinion that meshes with a rack arranged along this long track set parallel to the pipe to be cut that is supported by a holding table on the machine base. And a threaded tube that is engaged with a threaded rod arranged parallel to the track on the movable table and moves with the rotation of the threaded rod, is provided on a work table equipped with cutting means. Workbench moving mechanism in cutting machine.