The present disclosure relates to efficient assembly of triple pane windows that avoids contamination of the center pane during assembly.
One construction of insulating glass units (IGU's) involves forming a spacer frame by roll-forming a flat metal strip, into an elongated hollow rectangular tube or “U” shaped channel. A desiccant material is placed within the rectangular tube or channel, and some provisions are made for the desiccant to conic into fluid communication with or otherwise affect the Interior space of the insulated glass unit. The elongated, tube or channel is notched to allow the channel to be formed into a rectangular frame. A sealant is applied to the outer sides of the spacer frame in order to bond two glass panes or lites to opposite side of the spacer frame. Existing heated sealants include hot melts and dual seal equivalents (DSE). This system is not limited to these spacer frame types; other spacer frame technologies that are generally known in the industry can also be used with this system. The pair of glass panes are positioned on the spacer frame to form a pre-pressed insulating glass unit. Generally, the pre-pressed insulating glass unit is passed through an IGU oven to melt or activate the sealant. The pre-pressed insulating glass unit is then passed through a press that applies pressure to the glass and sealant and compresses the IGU to a selected pressed unit thickness. The completed IGU is used to fabricate a window or door.
It is known to construct triple pane IGUs having three panes or lites. Two outer panes contact spacer frames which separate the outer panes from a center or inner pane. When assembling an IG unit, it is important that the glass surfaces that are on the inside airspace remain uncontaminated for two reasons (1) preventing visual defects that cannot be cleaned and (2) preventing contamination of the perimeter of the glass which needs to remain clean or else the adhesive bond between the spacer seal and glass can be compromised ultimately leading to a seal failure.
GED, assignee of the present invention, currently manufactures an assembly system which conveys two lites of glass parallel to each other horizontally through a glass washer. One lite gets a spacer applied and the other passes through untouched. The two pieces of glass are conveyed and aligned onto as pair of vertical pivoting tables that bring the two pieces of glass together. The advantage to this system is that the glass surfaces that are on the inside of the IG are never touched by the conveyance system after the glass has left a glass washer, thus assuring the inside glass remains clean and contaminant free. This arrangement works very well for conventional dual glazed IG, but is not conducive for fabricating triple IG's. A current difficulty with assembling triple IG units is keeping all inside glass surfaces (Surfaces 2, 3, 4 & 5 on
Process Flow for Conventional (Dual) IG Units;
This process flow is well established. Note that each conveyor set (i.e. two adjacent conveyors) are split into separate drive zones. This facilitates the ability to simultaneously process smaller IG's. If a sensor detects an IG over a certain length, in this case over 49″, only one IG is processed at a time.
The disclosure describes a process flow and method and a system for assembling triple IG units (IGU's) without contaminating the center glass lite. A non-contact vacuum pad is used to lift a glass lite off from a horizontal support that conveys it from a glass washer to an assembly station. Each of multiple pads has a capacity to lift approximately seven to ten pounds. Use of multiple pads per glass sheet or lite allows lites having dimensions up to 70 by 100 inches (assuming glass thickness of one quarter inch) to be assembled.
An exemplary process of assembling triple pane insulating glass units uses two spacer frames that have sealant applied to opposite sides. Glass lites or panes of a specified size are washed and moved to an assembly station. A first glass lite is attached to a first spacer frame and a second glass lite is caused to hover over a surface. The first glass lite (and attached spacer frame) is moved into registration beneath the hovering glass lite. The second glass lite is then brought into contact with sealant on the spacer frame to which the first glass lite is attached. The combination of the first and second glass lites and the spacer frame are moved to a downstream workstation.
At the downstream workstation a second spacer frame and third glass lite that is attached to the second spacer frame are brought into registration with the combined first and second glass lites. A middle glass lite the hovering glass lite at the upstream station) is pressed against an exposed surface of one of said first and second lites into engagement with sealant on the second spacer frame to configure the triple pane insulating glass unit. This unit is then thermally treated so that sealant securely holds the panes to the frames of the triple pane insulating glass unit together.
Low-E coatings on any inside surface (Surfaces 2, 3, 4 & 5 on
These and other objects, advantages and features of the disclosed system will be better understood by reference to the accompanying drawings and their description.
The exemplary system depicts a primarily horizontal transport and assembly of triple IGU. It is conceivable that similar technologies employed by this patent can be adapted to a primarily vertical arrangement.
The figures illustrate an assembly station 110 for assembling triple pane insulating glass units (IGUs). An overhead conveyor (not shown) delivers MU spacer frames. U.S. Pat. No. 5,313,761, incorporated herein by reference for all purposes has a for more complete description of an IGU. Sealant is applied to opposite sides of the frames for constructing triple pane insulating glass units. At the assembly station 110, glass lites of a specified size that have been washed are moved to the assembly station 110.
A second glass lite 120 moves in the direction of an arrow 117 along a flat surface 118 out of the washer to a registration station 30 wherein the lite 120 is caused to hover over a generally flat surface. The first lite 112 and its associated spacer frame (and as depicted in
The first and second lites as well as a spacer frame sandwiched between the first and second lites forms a combination 140 (
A Process flow for triple IG units is depicted in
Note that Conveyors 160, 162, 164, 166 are an air flotation system which reduces the risk of the conveyor system marking lite 120 during transportation. With this process flow configuration, the order of the glass feed can be altered to suit placement of the low-e glass or muntins in the desired arrangement. Also, with the assembly flow depicted in
A vacuum system 210 is located above conveyors 164, 166 and has lifting pads that are unique in design. They generate a lifting force for lite 120 without making physical contact with the glass surface. This is important for the system's ability to not mark the glass during handling and assembly. One such non-contact lifting pad is made by SMC, called a “Cyclone Pad” 100 mm diameter pad has the capacity to vertically lift 7-10 lbs per lifting pad. To lift a 70″×100″×¼″ thick piece of glass, the vacuum system needs an array of pads spaced 18″ apart. For this maximum glass size, it is estimated that 20 “Cyclone Pads” would be required. Twenty four pads in a six by four array are shown in
Non-Contact Glass Transport, Squaring and Lift System Description
As described above, it is important that during manufacture of an IGU that does not marks, residual dirt or smudges are not left on the glass caused by operators or the conveyance system, and it is especially difficult to accomplish this for triple IGU. This section describes more detail of the sequence summarized above for assembling the center lite 120 of a triple IG without making physical contact with the inner or outer flat surfaces of the lite.
The glass lite 120 is corner registered by controlled movement of two push bars 280, 282 forming a part of the vacuum frame assembly 250. These push bars register the lite 120 against the pop up end stops 240 that engage two sides of the glass lite 120. One push bar 280 extends along one side of the vacuum frame assembly 250 in the ‘X’ direction and a second push bar 282 extends a shorter distance along a generally perpendicular direction to the first. To accommodate small glass sizes, the push bars 280, 282 must clear (pass beneath) the vacuum pads 252 as the bars move inward and outward.
In the exemplary embodiment, the vacuum pads are oriented, in an array as shown and are mounted to cross members 270 (
After the pads raise up out of the way so the push bar can pass beneath, the vacuum pads return to their original position. On a return trip by the push bar, the vacuum pads are again contacted (on the opposite side by the push bar and moved to their original positions shown in the Figures to await receipt of a next subsequent glass lite at the registration station. Movement of the push bars is accomplished with a suitable drive such as a servo motor coupled through a suitable transmission (not shown). Up and down movement of the pads and pop up stops is accomplished by suitable pneumatic actuators. Both the servo motors and pneumatic actuators along with a vacuum pump operate under control of a controller which in the exemplary embodiment is a programmable controller 200.
Butterfly Table, Adaptive Machine Cycling Routine
Currently the butterfly tables 50, 52 (
The invention senses the glass size and adapts the butterfly sequence according to a predetermined motion profile. Larger lites need to run slower than smaller lites, especially as the butterfly table approaches vertical. Having adaptive motion technology in the butterfly table can increase throughputs, since it is not necessary to run lites at speeds slower than possible.
To do this, the butterfly table has a servo-controlled system. A servo motor is used in place of the hydraulic system. An electro-pneumatic (proportional air regulator) servo system can also be used, or a ball screw system could be used. There are many ways to accomplish the end goal of coupling the machine's motion profile with a particular glass size. Recipes, or ranges of glass sizes, can be assigned to one motion profile and another range of glass sizes assigned to another profile, etc. These recipes would be stored in a computer or controller, and they can be recalled either manually or assigned to a specific input by a sensor array.
The invention has been described with a degree of particularity, but it is the intent that it include all modifications and alterations front the disclosed design falling within the spirit or scope of the appended claims.
The following application is a divisional application claiming priority to copending U.S. patent application Ser. No. 12/765,064 filed on Apr. 22, 2010, which claims priority to U.S. Provisional Patent Application Ser. No. 61/177,368 filed May 12, 2009. This application incorporates the above-identified applications herein by reference in their entirety and claims priority therefrom for all purposes.
This invention was made with Government Support under DE-NT0000167 awarded by DOE. The Government has certain rights in this invention.
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Number | Date | Country | |
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Parent | 12765064 | Apr 2010 | US |
Child | 14249776 | US |