Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Reexamination Certificate
1999-10-25
2001-04-10
Ip, Paul (Department: 2837)
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
C318S571000, C318S572000
Reexamination Certificate
active
06215267
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a numeric controller of a rotating mechanism for rotating a rotor around a predetermined rotation axis by a driving source linearly moving along a predetermined linear axis through a nonlinear transmission mechanism.
2. Description of Related Art
Conventionally, a rotating mechanism having a driving source for linear movement and a transmission mechanism for transmitting the linear movement of the driving source to a rotor is known for a machine tool having rotating mechanism for rotating a rotor around a predetermined rotation axis. A rack and pinion mechanism, worm gear mechanism etc. are used as the transmission mechanism.
Some of the rotating mechanism uses a cam mechanism for driving the rotor, which is, for example, shown in a rotating mechanism of Japanese Patent Publication Laid-open No. Hei 10-43976 (Japanese Patent Application No. Hei 8-198035).
FIG.
4
(A) shows a conventional rotating mechanism.
A rotating mechanism
1
has rotors
12
rotatably supported by a base member
11
, a driving source
13
for rotating the rotors
12
, and a transmission mechanism
14
for transmitting a movement of the driving source
13
to the rotors
12
.
The rotors
12
are rotatably supported by the supporting shaft
15
around a rotation axis A, and a recessed portion
121
for engaging later-described connecting shaft
143
is formed at an end thereof.
A built-in motor type spindle head
122
is provided adjacent to the rotation axis A of the rotor
12
, the spindle head
122
rotating in accordance with the rotating movement of the rotor
12
for conducting various processing to a workpiece.
The driving source
13
has a servo motor
131
, a pinion gear
132
for engaging a gear provided at a distal end of a rotation axis of the servo motor
131
, a feed screw rod
133
being rotated by the pinion gear
132
in accordance with rotation of the rotation axis of the servo motor
131
, and a feed nut
134
for engaging the feed screw rod
133
to move linearly along an extending direction of the feed screw rod
133
.
The transmission mechanism
14
for transmitting the linear movement of the feed nut
134
of the driving source
13
to the rotor
12
includes a horizontal slider
141
, a vertical slider
142
and a connecting shaft
143
.
The horizontal slider
141
is movable along an extending direction of a horizontal guide
111
linearly provided onto the base member
11
. A vertical guide
141
A extending perpendicular to extending direction of the horizontal guide
111
is provided on an upper surface of the horizontal slider
141
.
The vertical slider
142
is movable along the extending direction of the vertical guide
141
A, and the connecting shaft
143
for engaging to the recessed portion
121
of the rotor
12
is provided on an upper surface thereof.
The feed nut
134
of the driving source
13
is attached and fixed to the right horizontal slider
141
.
Incidentally, the horizontal sliders
141
respectively provided to the two rotors
12
are mutually connected by a connecting rod
144
so that one of the rotors
12
is rotated in accordance with the rotation of the rotor on the right side in FIG.
4
(A).
The rotating mechanism
1
is operated as follows.
(1) The feed screw rod
133
is rotated by the pinion gear
132
when the servomotor
131
is driven.
(2) The feed nut
134
is moved along the extending direction of the feed screw rod
133
by the rotation of the feed screw rod
133
.
(3) The horizontal slider
141
is moved simultaneously with the movement of the feed nut
134
and the rotor
12
is rotated through the connecting shaft
143
.
Incidentally, the connecting shaft
143
maintains engagement with the recessed portion
121
of the rotor
12
by moving along the vertical guide
141
A together with the vertical slider
142
during movement of the horizontal slider
141
.
And, as shown in FIG.
4
(B), a locus
12
A of the rotor
12
is arc-shaped around the rotation axis A in &thgr; direction relative to a locus
134
A of the feed nut
134
in L direction.
According to the rotating mechanism
1
, the linear movement of the driving source
13
can be transmitted to the rotation of the rotor
12
by a simple movement of the horizontal slider
141
and the vertical slider
142
along the guide
111
and
144
A.
Therefore, no wear of meshed portion, which causes failure of rotation movement as in the rack and pinion mechanism and worm gear mechanism, can occur, thereby obtaining highly durable rotating mechanism.
Further, when a plurality of rotor
12
is disposed adjacently in the transmission mechanism such as the rack and pinion mechanism, disposition space has to be set large for the gears of the adjacent transmission mechanism not to interfere with each other. In contrast thereto, since the rotor
12
can be closely disposed adjacently according to the above-mentioned rotating mechanism
1
, a size of a machine tool having a plurality of rotor can be reduced.
For controlling drive of the rotating mechanism
1
by a numeric controller, the actually controlled driving source
13
moves linearly. Accordingly, a linear position L of the driving source
13
is calculated based on angular position &thgr; of the target rotor
12
and the linear position L is transmitted to the numeric controller as a command value.
However, what is ultimately necessary for a process to give command to the numeric controller is angular position of the rotor
12
of the rotating mechanism. Therefore, the angular position &thgr; of the rotor
12
is conveniently given to the numeric controller for constructing a software program, which reduces burden on programmers.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a numeric controller of a rotating mechanism having a rotor rotated around a predetermined rotation axis through a non-linear transmission mechanism by a driving source for linearly moving around a predetermined linear axis which can facilitate to construct programs for transmitting commands to the numeric controller and reduce burdens on programmers.
The present invention is a numeric controller of a rotating mechanism for rotating a rotor around a predetermined rotation axis by a driving source for linearly moving along a predetermined linear axis through a non-linear transmission mechanism. The numeric controller is characterized in having a rotating position command means for transmitting angular position command value of the rotor; a radius setting means for setting a rotation radius of the rotor; and a linear position operation means for calculating a linear position command value of the driving source based on the angular position command value of the rotating position command means and the rotation radius set by the radius setting means.
According to the above arrangement, since the linear position operation means is provided, the rotating mechanism can be controlled by setting the angular position of the rotor as a command value by the rotating position command means when the rotation radius of the rotor of the rotating mechanism is set in advance by the radius setting means, thereby facilitating to construct program for transmitting commands to the numeric controller and reducing burden on programmers.
In the above arrangement, the linear position command value L (mm) can be calculated by the linear position operation means according to following formulas, where &thgr; (deg) represents the angular position command value commanded by the rotating position command means; and R (mm) represents rotation radius being set by the radius setting means:
(1) L=R×tan(&pgr;×&thgr;/180)
(2) L=R×sin(&pgr;×&thgr;/180)
According to calculation of the above formulas, the angular position command value of the rotation axis represented by angle &thgr; (deg) can easily be converted into linear position command value L (mm) of metric unit, thereby easily conducting drive control of the servo motor. Further, since the formula is simple
Ip Paul
Pillsbury & Winthrop LLP
Toshiba Kikai Kabushiki Kaisha
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