# US 9,751,246 B2 · Ejection controller for injection molding machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,246 B2 - Document ID: US9751246B2 - Status: Granted - Kind: B2 - Application number: 14/875,215 - Filed: 2015-10-05 - Published: 2017-04-27 - Granted: 2017-09-05 - Earliest claimed: 2014-10-06 - Assignees: Fanuc Corporation - Applicants: FANUC Corporation - Inventors: Shuichi Wakebe; Shinichi Saitou - Web page: https://patentgrep.com/patent/US9751246B2 ## CPC - B29C 45/7626: {the ejection or removal of moulded articles} - B29C 45/03: Injection moulding apparatus (transfer moulding B29C45/02) - B29C 45/40: Removing or ejecting moulded articles - B29C 45/4005: {Ejector constructions; Ejector operating mechanisms (B29C45/44 takes precedence)} - B29C 45/64: Mould opening, closing or clamping devices {(combined with means for plasticising or homogenising B29C45/70)} - B29C 45/84: Safety devices {(B29C45/7626 takes precedence)} - B29C 45/76: Measuring, controlling or regulating {(measuring in general G01; controlling or regulating in general G05)} - B29C 2945/76177: Location of measurement - B29C 2945/76314: Auxiliary devices - B29C 2945/76418: Ejection - B29C 2945/76719: Ejection unit - B29C 2945/76722: ejectors - B29C 2945/76822: Phase or stage of control - B29C 2945/76896: Ejection - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) ## Abstract An ejection controller for an injection molding machine has a function of interrupting ejection by an ejection device before the ejection is completed, a function of detecting closing of an open safety door surrounding a mold clamping unit of the injection molding machine, and a function of restarting the ejection by the ejection device when the closing of the open safety door is detected while the ejection device is interrupted. ## Claims ### Claim 1 An ejection controller for an injection molding machine, the injection molding machine comprising: a mold clamping unit; an injection unit; a mold unit; an ejection device for releasing a molded article of a resin from the mold unit after the resin injected from the injection unit into the mold unit is molded; and a cover unit provided at least around the mold clamping unit and comprising a safety door configured to be opened and closed, the ejection controller comprising: an ejection interruption control unit configured to, in response to position data indicating that the ejection device is at a predetermined ejection interrupting position, interrupt ejection by the ejection device before the ejection is completed; a safety door closing detection unit configured to detect closing of the safety door in an open state; and an ejection restart control unit configured to restart the ejection by the ejection device when the safety door closing detection unit detects the closing of the open safety door while the ejection device is interrupted by the ejection interruption control unit. ### Claim 2 An ejection controller for an injection molding machine, the injection molding machine comprising: a mold clamping unit; an injection unit; a mold unit; an ejection device for releasing a molded article of a resin from the mold unit after the resin injected from the injection unit into the mold unit is molded; and a cover unit provided at least around the mold clamping unit and comprising a safety door capable of being opened and closed, the ejection controller comprising: an ejection interruption control unit configured to interrupt ejection by the ejection device before the ejection is completed; a safety door closing detection unit configured to detect closing of the safety door in an open state; an ejection restart control unit configured to restart the ejection by the ejection device when the safety door closing detection unit detects the closing of the open safety door while the ejection device is interrupted by the ejection interruption control unit; and an ejection load detection unit configured to detect a value of an ejection load of the ejection device, wherein the ejection interruption control unit is configured to interrupt the ejection by the ejection device when the ejection load value detected by the ejection load detection unit exceeds a predetermined first threshold after the ejection by the ejection device is started, and thereafter, the detected ejection load value falls below a predetermined second threshold lower than the first threshold. ### Claim 3 (depends on 2) The ejection controller according to claim 2, wherein the first threshold is set based on the ejection load value detected by the ejection load detection unit during a dry cycle. ### Claim 4 (depends on 2) The ejection controller according to claim 2, wherein a position of the ejection device detected when the ejection by the ejection device is interrupted is set as an ejection interruption setting position, and ejection interrupting positions of the ejection device in subsequent cycles are set based on the set ejection interruption setting position. ### Claim 5 (depends on 1) The ejection controller according to claim 1, further comprising an ejection restart instruction input unit of the ejection device, wherein the ejection restart control unit is configured to restart the ejection by the ejection device when an ejection restart instruction signal is input from the ejection restart instruction input unit after the closing of the safety door is detected by the safety door closing detection unit. ### Claim 6 (depends on 1) The ejection controller according to claim 1, wherein the ejection interruption control unit is configured to also stop a mold opening operation when the ejection by the ejection device is interrupted, and the ejection restart control unit is configured to also restart the mold opening operation when the ejection by the ejection device is restarted. ### Claim 7 (depends on 1) The ejection controller according to claim 1, wherein restarting the ejection from the interrupted state includes retracting the ejection device from the predetermined ejection interrupting position. ### Claim 8 (depends on 1) The ejection controller according to claim 1, further comprising an ejection load detection unit configured to detect a value of an ejection load of the ejection device, wherein the ejection interruption control unit is configured to interrupt the ejection by the ejection device when the ejection load value detected by the ejection load detection unit exceeds a predetermined first threshold after the ejection by the ejection device is started, and thereafter, the detected ejection load value falls below a predetermined second threshold lower than the first threshold. ### Claim 9 (depends on 8) The ejection controller according to claim 8, wherein the first threshold is set based on the ejection load value detected by the ejection load detection unit during a dry cycle. ### Claim 10 (depends on 8) The ejection controller according to claim 8, wherein a position of the ejection device detected when the ejection by the ejection device is interrupted is set as an ejection interruption setting position, and ejection interrupting positions of the ejection device in subsequent cycles are set based on the set ejection interruption setting position.