Injection molding device

Patent metadata

Field	Value
Publication number	US-12285896-B2
Application number	US-202318358058-A
Country	US
Kind code	B2
Filing date	Jul 25, 2023
Priority date	Jul 27, 2022
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

An injection molding device includes a housing having a door, an injection molding machine, a detection section, and a control section. The control section controls voltage applied to the mold clamping motor, and performs mold-clamping and mold-opening of the upper mold and the lower mold by either moving the injection unit and the upper mold along the vertical direction or by moving the lower mold along the vertical direction. The mold clamping device further includes a first brake section that, when application of voltage to the mold clamping motor is stopped, regulates movement of the injection unit and the upper mold in the vertical direction or movement of the lower mold in the vertical direction. When the detection section detects that the door is open or detects intrusion of foreign matter, the control section stops application of voltage to the mold clamping motor.

First claim

What is claimed is:

1. An injection molding device comprising:
a housing including a door;
an injection molding machine stored in the housing;
a detection section configured to detect whether the door is open or closed or to detect intrusion of foreign matter into the housing; and
a control section, wherein
the injection molding machine includes
a support section for supporting a die-casting mold having an upper mold and a lower mold,
an injection unit configured to inject a molding material toward a cavity defined by the upper mold and the lower mold, and
a mold clamping device including a mold clamping motor that drives the die-casting mold,

the injection unit, the upper mold, and the lower mold are disposed in this order in a vertical direction from above, while in a supported state in which the die-casting mold is supported by the support section,
in the supported state, the control section controls voltage applied to the mold clamping motor and performs mold-clamping and mold-opening of the upper mold and the lower mold by either moving the injection unit and the upper mold along the vertical direction or by moving the lower mold along the vertical direction,
the mold clamping device further includes a first brake section that, when application of voltage to the mold clamping motor is stopped, regulates movement of the injection unit and the upper mold in the vertical direction or movement of the lower mold in the vertical direction, and
when the detection section detects that the door is open or detects intrusion of foreign matter, the control section stops application of voltage to the mold clamping motor.

2. The injection molding device, according to claim 1 , wherein
the detection section has a light emitting section and a light receiving section.

3. The injection molding device, according to claim 1 , further comprising:
an ejector section configured to remove a molded article from the lower mold, wherein
the ejector section includes an ejector pin and an ejector motor driving the ejector pin,
the control section stops application of voltage to the ejector motor when the detection section detects that the door is open or detects intrusion of foreign matter,
the ejector section includes a second brake section that regulates movement of the ejector pin in a state in which application of voltage to the ejector motor is stopped.

4. The injection molding device, according to claim 1 , wherein
the injection unit includes a heating section configured to plasticize material to generate the molding material, and the heating section and the mold clamping motor are coupled to different power supplies.

5. The injection molding device, according to claim 1 , wherein
the injection unit includes a plasticizing section that plasticizes material to generate the molding material,
the plasticizing section includes
a groove formed surface in which a groove is formed,
a flat screw that rotates about a rotation shaft,
a facing surface facing the groove formed surface, and
a barrel in which a communication hole into which the molding material flows is formed,

the flat screw has a length in a direction along the rotation axis shorter than a length in a direction perpendicular to the rotation axis, and
the flat screw and the barrel are arranged in this order in the vertical direction from above.

6. The injection molding device, according to claim 5 , wherein
the injection unit includes a screw motor that rotates the flat screw,
the control section stops application of voltage to the screw motor when the detection section detects that the door is open or detects intrusion of foreign matter, and
the injection unit includes a third brake section that regulates the rotation of the flat screw in a state in which application of voltage is stopped to the screw motor.

7. The injection molding device, according to claim 1 , wherein
the lower mold includes a first lower mold and a second lower mold,
the support section includes a first support section supporting the first lower mold and a second support section supporting the second lower mold, and
the injection molding device further includes a position change section configured to move the first support section and the second support section, wherein
the position change section switches the supported state between
a first supported state in which the first lower mold is located at a position facing the upper mold and the second lower mold is located at a position not facing the upper mold and
a second supported state in which the second lower mold is located at a position facing the upper mold and the first lower mold is located at a position not facing the upper mold.

8. The injection molding device, according to claim 7 , further comprising:
a first ejector section configured to, in the first supported state, remove the molded article from the second lower mold and
a second ejector section configured to, in the second supported state, eject the molded article from the first lower mold, wherein
each of the first ejector section and the second ejector section has an ejector pin and an ejector motor for driving the ejector pin,
the ejector motors of the first ejector section and the second ejector section are located below the support section, and
the mold clamping motor is located between the ejector motor of the first ejector section and the ejector motor of the second ejector section.

9. The injection molding device, according to claim 1 , further comprising:
an ejector section having an ejector pin for removing a molded article from the lower mold and
a movable pin movable in the cavity, wherein
the movable pin operates in conjunction with an operation of the ejector section, and
after or while the molding material is injected into the cavity, the control section controls the ejector section to move the movable pin in the cavity.

Assignees

• Seiko Epson Corp

Inventors

• Maruyama Hidenobu
• Anegawa Kenta
• Harayama Kazuyuki

Classifications

• B29C45/7626

  the ejection or removal of moulded articles · CPC title

• B29C2945/76709

  clamping or closing drive means · CPC title

• B29C2945/76665

  screw · CPC title

• B29C2945/76525

  Electric current or voltage · CPC title

• B29C2045/664

  using mould clamping means operating independently from the mould closing means · CPC title