U.S. patent number 3,827,190 [Application Number 05/363,503] was granted by the patent office on 1974-08-06 for pipe cutting machine with spark actuated feed control.
This patent grant is currently assigned to Mitsui Shipbuilding and Engineering Co., Ltd.. Invention is credited to Shigeru Moriguchi, Yuzi Saito, Mitsuo Tamura.
United States Patent |
3,827,190 |
Moriguchi , et al. |
August 6, 1974 |
PIPE CUTTING MACHINE WITH SPARK ACTUATED FEED CONTROL
Abstract
Pipe cutting machine comprising a grinding wheel for cutting a
pipe, means for detecting sparks from the grinding wheel or the
pipe in cutting operation, and means for reducing the feeding speed
of the grinding wheel, when said means is operated by sparks.
Inventors: |
Moriguchi; Shigeru (Chiba,
JA), Tamura; Mitsuo (Chiba, JA), Saito;
Yuzi (Kanagawa, JA) |
Assignee: |
Mitsui Shipbuilding and Engineering
Co., Ltd. (Tokyo, JA)
|
Family
ID: |
12964008 |
Appl.
No.: |
05/363,503 |
Filed: |
May 24, 1973 |
Foreign Application Priority Data
|
|
|
|
|
May 30, 1972 [JA] |
|
|
47-54204 |
|
Current U.S.
Class: |
451/6; 451/231;
451/26 |
Current CPC
Class: |
B24B
27/065 (20130101); B24B 47/20 (20130101) |
Current International
Class: |
B24B
47/20 (20060101); B24B 47/00 (20060101); B24B
27/06 (20060101); B24b 027/06 () |
Field of
Search: |
;51/165R,165.72,165.73,165.92,270,134S,99,98R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Whitehead; Harold D.
Attorney, Agent or Firm: Howson and Howson
Claims
What is claimed is:
1. A pipe cutting machine comprising a swing arm provided with a
grinding wheel for cutting a pipe, a hydraulic cylinder to rotate
said swing arm, valve means for reducing the rotating speed of said
swing arm, a photo electric means for detecting sparks from the
pipe or the grinding wheel in cutting operation, and means for
operating said valve means to reduce the speed of the swing arm to
a cutting speed when said photo electric means is being actuated by
sparks.
Description
The present invention relates to a pipe cutting machine provided
with a control means for feeding speed of the grinding wheel.
In conventional pipe cutting machine, feeding speed is not varied
in idling and also cutting stroke.
An object of the present invention is to provide a pipe cutting
machine of which grinding wheel may be rapidly fed in idling stroke
for increase the working efficiency.
To this end, according to the present invention, the pipe cutting
machine comprises a swing arm provided with a grinding wheel for
cutting a pipe, a hydraulic cylinder to rotate said swing arm,
valve means for reducing the rotating speed of said swing arm, a
photo electric means for detecting sparks from the pipe or the
grinding wheel in cutting operation, and means for operating said
valve means to reduce the speed of the swing arm to a cutting speed
when said photo electric means being actuated by sparks.
In the drawings;
FIG. 1 is a side view of a pipe cutting machine in accordance with
the present invention; and
FIG. 2 is a diagrammatical view showing operation thereof.
Referring to the drawings, in FIG. 1 a pipe 1 to be cut is
supported by a plurality of rollers 3 provided on a bed 2 and
arranged along the pipe and is held by pressure rollers 3a. A grind
wheel arm 4 is pivotally provided on the bracket 5 by the pin 6. A
grinding wheel 8 is rotatably provided on the end of the arm 4 by a
shaft 7 and adapted to be rotated by a belt 12 engaged with a
pulley 9 on the shaft 7 and a pulley 11 on the shaft of the motor
10. An air cylinder 13 is connected on the bed 2 by a pin 14 and
the piston rod 15 is connected to the end of the arm 4 by a pin 16.
A braking oil hydraulic cylinder 17 is secured to the air cylinder
13 and the piston rod 18 is connected to the piston rod 15 of the
air cylinder by a member 18 thereby both piston rods can be
simultaneously moved. Opposite chambers of the braking cylinder 17
are connected each other through flow metering valves 20 and 21 and
a solenoid controlled valve 22. A photo transistor 23 is provided
on the bracket 5 to be directed to the pipe 1.
FIG. 2 shows the idling stroke, more particularly, chambers of the
braking cylinder 17 are communicated through lower resistance valve
20. Therefore, the arm 4 is quickly rotated in the
counter-clockwise direction by operation of the air cylinder 13.
When the grinding wheel 8 contacts with the pipe 1, the sparks
actuates the photo transistor 23 to emanate an electrical signal,
the electrical signal is transmitted to the solenoid controlled
valve 22 through an amplifier 24, thereby the solenoid controlled
valve is operated to change the passages to connect the higher
resistance valve 21 to the chambers of the braking cylinder 17.
Thus, the rotating speed of the arm 4 is reduced to a cutting
speed. In the return stroke, the solenoid controlled valve 22 is
operated by not shown switch, so that the lower resistance valve 20
is connected to the braking cylinder, thus the arm 4 is quickly
returned. It will be noted that the means may be arranged to be
operated without the braking cylinder 17 by providing a flow
control means for the air cylinder 13.
* * * * *