Molding machine

• US 6,051,896 A
• Filed: 04/28/1999
• Issued: 04/18/2000
• Est. Priority Date: 05/01/1998
• Status: Expired due to Fees

• Current Assignee: Moog Japan Ltd.
• Original Assignee: Misso Electric Company, Nissei Plastic Industrial Co., Ltd.
• Inventors: Nishida, Satoshi, Shibuya, Hiroshi, Koide, Atsushi, Sekiyama, Tokuzou, Matsubara, Satoru
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Ghahramani, Saeed
• Application Number:
  US09/300,510
• Time in Patent Office: 356 Days
• Field of Search: 310/12, 310/13, 310/14, 310/152, 310/156, 310/15, 425/3, 425/174.8 R, 425/DIG. 33, 335/281, 335/220, 335/255
• US Class Current: 310/12.14
• CPC Class Codes: B29C 2045/1793 by an electric linear motor linear motors in general H02K41/02
• CPC Class Codes: B29C 2045/5032 using means for detecting injection or back pressures
• CPC Class Codes: B29C 45/5008 Drive means therefor
• CPC Class Codes: B29C 45/76 Measuring, controlling or regulating measuring in general G01; controlling or regulating in general G05
• CPC Class Codes: H02K 16/00 Machines with more than one rotor or stator machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029
• CPC Class Codes: H02K 21/14 with magnets rotating within the armatures
• CPC Class Codes: H02K 2201/18 Machines moving with multiple degrees of freedom
• CPC Class Codes: H02K 41/03 Synchronous motors; Motors moving step by step; Reluctance motors H02K41/035 takes precedence

Abstract

A molding machine includes a drive unit for rotating and linearly moving a movable body. The drive unit includes a linear motor and a rotary motor. The linear motor includes a linear movement body having moving-side magnetic-pole portions and supported in an axially movable manner and a stationary body having stationary-side magnetic-pole portions adapted to linearly move the linear movement body. The linear movement body has moving-side inclined surfaces on which part of the moving-side magnetic-pole portions are disposed. The stationary body has stationary-side inclined surfaces which face the moving-side inclined surfaces and on which part of the stationary-side magnetic-pole portions are disposed. The rotary motor is incorporated into the linear movement body and is adapted to rotate an output shaft connected to the movable body.

Claims

1. A molding machine including a movable body and a drive unit for rotating and linearly moving the movable body, said drive unit comprising:

a linear motor comprising a linear movement body having a moving-side magnetic-pole portion and supported in an axially movable manner, and a stationary body having a stationary-side magnetic-pole portion adapted to linearly move the linear movement body; and

a rotary motor incorporated into the linear movement body and adapted to rotate an output shaft connected to the movable body, wherein

the linear movement body has a moving-side inclined surface on which part of the moving-side magnetic-pole portion is disposed, and the stationary body has a stationary-side inclined surface which faces the moving-side inclined surface and on which part of the stationary-side magnetic-pole portion is disposed.

2. A molding machine according to claim 1, wherein a rotation-restricting mechanism for restricting rotation of the linear movement body is provided between the linear movement body and the stationary body.

3. A molding machine according to claim 1, wherein the stationary body comprises a casing assuming a tubular shape of square cross section, and a front portion of the casing is reduced in size toward a front end thereof to form a tetragonal pyramid.

4. A molding machine according to claim 3, wherein the stationary body has an armature portion serving as the stationary-side magnetic-pole portion on each of two opposed interior surfaces of the casing.

5. A molding machine according to claim 3, wherein the stationary body has a field-generating portion on each of two other opposed interior surfaces of the casing, the field-generating portion being adapted to generate the moving-side magnetic-pole portion through magnetization of the linear movement body.

6. A molding machine according to claim 1, wherein the linear movement body comprises a housing assuming a tubular shape of square cross section, and a front portion of the housing is reduced in size toward a front end thereof to form a tetragonal pyramid, and magnetic elements are arranged at predetermined intervals on an outer surface of the casing.

7. A molding machine according to claim 1, wherein the rotary motor comprises a pressure endurance mechanism for enduring pressure applied axially to the output shaft.

8. A molding machine according to claim 7, wherein the pressure endurance mechanism comprises a thrust bearing for supporting a shaft of the rotary motor.

9. A molding machine according to claim 7, wherein the pressure endurance mechanism comprises a stopper portion formed on the housing and adapted to allow the shaft to axially move by a predetermined distance;

a contact plate provided integrally on a portion of the shaft;

an engagement portion provided integrally on an interior surface of the housing and located behind the contact plate; and

an electromagnet portion provided integrally within the housing and located ahead of the contact plate.

10. A molding machine according to claim 7, wherein the pressure endurance mechanism comprises a magnetic bearing which, in turn, comprises inclined portions formed at front and rear parts of a rotor portion of the rotary motor;

magnetic attraction elements disposed on the inclined portions;

inclined portions formed on an interior surface of the housing in such a manner as to face the inclined portions of the rotary motor; and

multipolar electromagnets disposed on the inclined portions of the housing.

11. A molding machine according to claim 1, wherein the rotary motor is disposed within a hollow space formed within the linear movement body.

12. A molding machine according to claim 1, wherein the rotary motor is disposed outside the linear movement body and is integrally connected to the linear movement body.

13. A molding machine according to claim 1, wherein the movable body is a screw disposed within an injection apparatus of an injection molding machine.