TH48281B - Methods and injection devices that use heat control methods directly on the inserts. - Google Patents

Abstract

DC60 (29/09/49) Hardware morphology and combination of methods for injection molding ophthalmic lenses using a thermostatic fluid circulating in a cavity located within the insert. The cavity is closed by a check valve. The regulator incorporates a check valve. The valve seals throughout the working period L before the valve is opened to allow the heating fluid to circulate into the insert. The insert can be easily changed or chimneyed without leakage and without any change in the shape of the insert. Hardware morphology and combination of methods for injection molding ophthalmic lenses using a thermostatic fluid circulating in a cavity located within the insert. The cavity is closed by a check valve. The regulator incorporates a check valve. The valve seals throughout the working period L before the valve is opened to allow the heating fluid to circulate into the insert. The insert can be easily changed or chimneyed without leakage and without any change in the shape of the insert.

Claims (9)

1. A method for protecting the molded surface of an insert from the heated fluid flowing within the insert, comprising the following steps: arranging a valve on the insert so as to allow access to a channel within the insert; installing the insert into a molding machine with a heated fluid supply integrated; and, during installation, opening a valve so as to allow the fluid source to be connected to the fluid delivery port. 2. The method as described in claim 1, wherein the insert further comprises a support surface opposite the part forming surface, and the valve is mounted in the support surface. 3. The method as described in claim 2, further comprising the stud shaft extending outward from the support surface in an axial direction. 4. The method as described in claim 3, wherein the valve is axially extended from the support surface, extending parallel to the stud axis. 5. The method as described in claim 4, wherein the injection molding machine comprises an adjuster that supports the insert and supports the stud and valve shaft. 6. The method as described in claim 5, further comprising a shim positioned between the support surface and the standoff rod. 7. The method as specified in claim 6, wherein the shim comprises a closure that serves to support the stud shaft and the valve body. 8. The method as described in claim 6, wherein said installation step comprises sliding the insert into the support of the injection molding machine in an axial direction. 9. The method as stated in claim 8, wherein said mounting step further comprises moving the insert a certain distance axially so as to bring the stud shaft into contact with the chuck 1 ; the method as stated in claim 9, wherein the chuck is a linearly actuated chuck extending inward in a circular direction to engage the stud shaft 1 ; the method as stated in claim 6, wherein the opening step occurs over a range of axial movement exceeding the thickness of the shim 1 ; the method as stated in claim 1, further comprises removing the insert from the injection molding machine; and closing a valve during such removal 1 ; the method as stated in claim 1, wherein the valve is pulled into the closed position 1 ; the method as stated in claim 1, wherein the injection molding machine comprises a sealed valve, and said opening step further comprises bringing the valve into contact with it. With a coupled valve, the method as stated in claim 14, wherein said opening step comprises a step to cause the fluid source to connect to the port after a sealing connection has been made between the valve body and the coupled valve, the method as stated in claim 1, wherein said providing step comprises forming a port within the top half of the insert; and installing a valve into the bottom half of the insert; and joining the halves together to form an insert, the method as stated in claim 16, wherein the halves of the insert are made of metal and are bonded together using an electron beam, the method as stated in claim 1, wherein said providing step comprises providing two valves on the insert, the method as stated in claim 18, wherein said opening step comprises opening the two valves during installation so as to cause the fluid source to connect to the port after a sealing connection has been made between the two valves and the incoming valve. 2. A method for adjusting the position of the insert body parts along the box line of the injection molding machine, comprising the steps as follows: providing a set of inserts comprising an insert having internal channels for fluid circulation, a heat control, and a check valve capable of opening a distance L; and adjusting the position of the insert by adjusting the shim of the insert along the support surface of the injection molding machine; adjusting a distance less than L without changing the valve itself, thus enabling the use of a single set of inserts at different locations along the box line of the injection molding machine; the method as stated in claim 20, comprising the steps as follows: providing a stud on the insert that is held by a gripper on the injection molding machine; the method as stated in claim 20, wherein said adjustment step is comprising the steps of selecting a stud shaft of sufficient length to align with the holder; the two methods as stated in claim 22, wherein the length of the stud shaft to its grip is the sum of the height of the shim and the distance from the support surface to the holder; the two methods as stated in claim 23, wherein the length of the stud shaft is increased by an amount equal to the increased height of the shim; the two methods as stated in claim 20, wherein said adjustment step comprises moving the insert axially into the holder without using a bolted fastener to pull the insert into its position; the two methods as stated in claim 20, wherein the distance L comprises a projecting distance parallel to the center axis of the holder; the two methods as stated in claim 20, further comprising the steps of forming lenses of the same curvature and varying thickness using a single set of inserts; the two methods as stated in claim 27, wherein the lens comprises a finished lens and Two methods as stated in claim 20, wherein a single insert assembly comprising a formed surface, a metallic part, and a thermally controlled fluid circulating within the insert is used to form lenses of the same curvature and varying thicknesses. Three methods as stated in claim 20, wherein the insert assembly has a cavity that is sealed by a leak-proof valve when the insert assembly is retracted axially beyond the operating distance L of the valve body.