Metal deforming – By deflecting successively-presented portions of work during... – By use of work-contacting wiper and moving – work-holding form
Reexamination Certificate
2000-05-30
2001-02-27
Butler, Rodney A. (Department: 3725)
Metal deforming
By deflecting successively-presented portions of work during...
By use of work-contacting wiper and moving, work-holding form
Reexamination Certificate
active
06192728
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a pipe ending machine, particularly controlling accurately bending action with high speed by means of a ball threaded rod and a ball threaded nut.
Conventional pipe bending machines uses air or oil pressure cylinders or motors as power source for bending straight pipes into preset angles. Air pressure cylinders have a drawback of leak in use, and oil pressure cylinders may easily leak oil and have oil temperature problems. In general, air or oil pressure cylinders used as power source involves bad stability in bending process, so motors are preferable for pipe bending machines. However, pipe-bending machines using motors as power source still may be influenced by counter-pressure of the component such as a speed reducer, causing accuracy hard to ensure.
A pipe-bending machine disclosed in U.S. Pat. No. 4,750,346 is shown in
FIGS. 1 and 2
, bending a pipe
10
to form a bent portion
101
, including a base
11
laid on the ground, a material feeding device
12
fixed on the base
11
for moving a pipe
10
. The feeding device
12
has a clamp head
13
in the front portion, a bending device
14
fixed at the most front (in the left side in
FIG. 1
) to form a bent portion
101
. The bending device
14
has an arm-turning shaft
141
for the pipe
10
to rest on, and a turning arm
142
to hold the pipe
10
. A clamp mold
143
to clamp the pipe
10
is fixed on the turning arm
142
, which is moved by a transmitting device
2
deposited in a lower portion of the base
10
.
As shown in
FIGS. 2 and 3
, the above patent has the transmitting device including a speed reducer
21
fixed in a lower portion of the base
11
and a motor
22
under the speed reducer
21
to move together. The speed reducer
21
has an output shaft
211
protruding up an upper side and in parallel with the axis of the arm-turning shaft
141
. A disc
212
is fixed on the output shaft
211
to move together, and two cranks
23
are connected between the disc
212
and the turning arm
142
. When the motor
22
drives the speed reducer
21
, the output shaft
211
transmits power to turn the disc
212
, and then the cranks
23
to force the turning arm
142
rotate with the arm-turning shaft
141
as a pivot. Then the pipe
10
clamped between the clamp mold
143
and the arm-turning shaft
141
is bent to form the bent portion
101
.
The conventional pipe-bending machine
1
utilizes the motor
22
and the speed reducer
21
to directly move the two cranks
23
, and then rotates the turning arm
142
to achieve the objective to bend a pipe. But a common speed reducer
21
may produce counter-pressure problem owing to accuracy of a component in the process of operation. In order to enhance accuracy of high speed bending, a low counter-pressure (or good process accuracy) speed reducer may be chosen, but this kind of speed reducer must have its gears to be coordinated with cutting, grinding, hardening, choosing and assembly. Manufacturing may cost very high, and take much time. If a speed reducer
21
of common counter-pressure is used in a pipe bending machine, error in counter-pressure is directly transmitted by the two cranks
23
to the turning arm
142
, letting the arm-turning shaft
141
also have the same counter-pressure to cause inaccuracy in pipe bending action with high speed. Besides, the two cranks
23
are designed to interact with each other, the speed reducer and the motor
22
have to positioned vertical, so the height of the base
11
has to be increased, with the dimensions of the pipe bending machine difficult to reduce.
SUMMARY OF THE INVENTION
This invention has been devised to offer a pipe-bending machine accurately controlling accuracy of bent angles of pipes.
The invention includes a base, a material feeding device, an arm fixing device, a pipe bending device, and a transmission device.
The base has a flat wall along below the moving route of a material pipe, and the flat wall has a side, from which a vertical extension wall extends down, with an opening bored in the vertical extension wall.
The material feeding device is fixed on the base for clamping and moving a material pipe.
The arm-fixing device is fixed on the base to hold a material pipe.
The pipe-bending device is positioned in front of the flat surface of the base, including a vertical arm-turning shaft fixed on the flat wall, which has a bending mold for a material pipe to rest on, connected and move with a turning arm. The turning arm has a clamp mold facing the bending mold to clamp a material pipe.
The transmitting device is fixed between the flat wall and the vertical side wall of the flat wall, for driving the turning arm to rotate, having a motor fixed on the vertical side wall, and a ball threaded rod driven by the motor and located in parallel to the pipe moving route. The threaded rod is positioned between two bearing bases vertically protruding up the vertical sidewall, screwed with a threaded nut facing the opening on the base. The ball threaded nut moves together with a pull block, which is moved by an interacting device positioned between itself and the arm-turning shaft.
When the motor drives the ball threaded rod rotate, the ball threaded rod may move the pull block, and then the interactive device rotates the arm-turning shaft, so the turning arm may rotate with the arm-turning shaft as a pivot, performing bending action to the material pipe clamped between the clamp mold and the bending mold.
REFERENCES:
patent: 4563891 (1986-01-01), Schwarze
patent: 4750346 (1988-06-01), Traub
patent: 5148695 (1992-09-01), Ellis
patent: 5678411 (1997-10-01), Schwarze
Butler Rodney A.
Kamrath Alan
Yin Lin Machine Industrial Co., LTD
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