Patent EP0140530A1 successfully refreshed from Google Patents.
US4735564A
Expired / Lapsed
US
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Injection molding machine
Assignee: Shibaura Machine Co Ltd
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Filing: 1987-06-17
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Granted: 1988-04-05
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Expires: 2007-06-17
Abstract
Abstract An injection molding machine generally comprises a heating cylinder, a screw rotated and reciprocated in the heating cylinder and a screw drive system. The screw drive system comprises two motors and two sensors connected respectively thereto which are automatically controlled by a control system in connection with a screw revolution number and a screw back pressure, or independently so as to accurately carry out the resin measuring process. The control system performs an adaptive control of a motion control system inclusive of the screw and the screw drive system in response to a screw speed instruction, a screw revolution number feedback signal, and a screw position feedback signal in accordance with various control modes.
Inventors
- 👤 Yoshinari Sasaki
- 👤 Etsuji Oda
- 👤 Hirozumi Nagata
- 👤 Naoki Kurita
- 👤 Hiroyuki Maehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:54
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/76; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/23; G05B19/231; G05B19/232; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41255; G05B2219/45; G05B2219/45244
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
277 words
An injection molding machine of the type in which material resin supplied into a hollow heating cylinder is heated and fed forwardly by a screw which is rotated and reciprocated in said heating cylinder and resin melted and plasticized in said heating cylinder is injected into a mold, comprising: instruction producing means for producing an instruction signal indicative of a screw position; drive means operatively connected to said screw for rotating and reciprocating said screw, said drive means comprising a first electric motor for rotating said screw and a second electric motor for reciprocating said screw; means operatively connected to said drive means for detecting a screw revolution number and a screw position, said detecting means comprising a first sensor connected to said first motor for detecting the revolution number of said screw and producing a screw revolution number feedback signal and a second sensor connected to said second motor for detecting the screw position and producing a screw position feedback signal representing back pressure on said screw; and control means which is operatively connected to said drive means and said detecting means and in which said instruction signal, said screw revolution number feedback signal and said screw position feedback signal are inputted, said control means producing in response to both said screw revolution number and said screw position feedback signals a screw revolution number signal which is applied to said first electric motor for rotating said screw and a screw back pressure signal which is applied to said second electric motor for reciprocating said screw so that a signal representing a deviation between said position instruction signal and said screw position feedback signal become substantially zero.
Claim 2
Dependent Claim
277 words
An injection molding machine of the type in which material resin supplied into a hollow heating cylinder is heated and fed forwardly by a screw which is rotated and reciprocated in said heating cylinder and resin melted and plasticized in said heating cylinder is injected into a mold, comprising: instruction producing means for producing an instruction signal indicative of a screw position; drive means operatively connected to said screw for rotating and reciprocating said screw, said drive means comprising a first electric motor for rotating said screw and a second electric motor for reciprocating said screw; means operatively connected to said drive means for detecting a screw revolution number and a screw position, said detecting means comprising a first sensor connected to said first motor for detecting the revolution number of said screw and producing a screw revolution number feedback signal and a second sensor connected to said second motor for detecting the screw position and producing a screw position feedback signal representing back pressure on said screw; and control means which is operatively connected to said drive means and said detecting means and in which said instruction signal, said screw revolution number feedback signal and said screw position feedback signal are inputted, said control means producing in response to both said screw revolution number and said screw position feedback signals a screw revolution number signal which is applied to said first electric motor for rotating said screw and a screw back pressure signal which is applied to said second electric motor for reciprocating said screw so that a signal representing a deviation between said position instruction signal and said screw position feedback signal become substantially zero.
Claim 3
Dependent Claim
116 words
The injection molding machine according to claim 1, wherein said control means comprises a position control element into which a signal regarding said deviation between said position instruction signal and said screw position feedback signal is inputted, a speed control element which produces signals regarding back pressure instruction and revolution number instruction in response to an output signal from said position control element, a back pressure control element producing a signal regarding screw back pressure in response to said back pressure instruction, and a revolution number control element producing a signal regarding screw revolution number in response to a signal regarding a deviation between said revolution number instruction signal and said screw revolution number feedback signal.
Claim 4
Dependent Claim
31 words
The injection molding machine according to claim 1, wherein said first motor is secured on a drive table which is operatively reciprocated in accordance with the driving of said second motor.
Claim 5
Dependent Claim
48 words
The injection molding machine according to claim 3, wherein said drive table is operatively connected to a ball nut member engaged with a ball screw connected to a drive shaft of said second motor, thereby reciprocating said drive table in accordance with the driving of said second motor.
Claim 6
Dependent Claim
18 words
The injection molding machine according to claim 3, wherein said second sensor is mounted to said drive table.
Claim 7
Dependent Claim
20 words
The injection molding machine according to claim 1, wherein said instruction producing means further produces a revolution number instruction signal.
Claim 8
Dependent Claim
78 words
The injection molding machine according to claim 6, wherein said control means comprises a back pressure control element producing a signal regarding a screw back pressure in response to an inputted deviation signal between said position instruction signal and said screw position feedback signal, and a revolution number control element producing a signal regarding a screw revolution number in response to an inputted deviation signal between said revolution number instruction signal and said screw revolution number feedback signal.
Claim 9
Dependent Claim
16 words
The injection molding machine according to claim 7 wherein said revolution number instruction signal is constant.
Claim 10
Dependent Claim
21 words
The injection molding machine according to claim 1, wherein said instruction producing means further produces a screw back pressure instruction signal.
Claim 11
Dependent Claim
93 words
The injection molding machine according to claim 9, wherein said control means comprises a back pressure control element producing a signal regarding screw back pressure in response to said screw back pressure instruction signal, a position control element into which a signal regarding a deviation between said position instruction signal and said screw position feedback signal is inputted, and a revolution number control element producing a signal regarding screw revolution number in response to a deviation signal between the output signal from said position control element and said screw revolution number feedback signal.
Claim 12
Dependent Claim
17 words
The injection molding machine according to claim 10 wherein said screw back pressure instruction signal is constant.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |