Method and apparatus for making a multi-cellular collapsible shade

• US 5,015,317 A
• Filed: 12/22/1988
• Issued: 05/14/1991
• Est. Priority Date: 12/22/1988
• Status: Expired due to Term

• Current Assignee: Comfortex Corporation (Hunter Douglas N.V.)
• Original Assignee: Comfortex Corporation (Hunter Douglas N.V.)
• Inventors: Corey, John A., Schnebly, John T.
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): Yoder, Michele K.
• Application Number:
  US07/287,740
• Time in Patent Office: 873 Days
• Field of Search: 156/197, 156/204, 156/474, 156/462, 156/459, 156/461, 156/87, 156/286, 156/205, 156/199, 156/366, 156/350, 428/116, 428/118, 160/84.1, 425/336, 425/368, 425/369, 493/413, 493/418, 493/450, 493/451, 162/280, 414/594, 414/610, 414/612, 414/613, 414/662
• US Class Current: 156/197
• CPC Class Codes: B31F 1/245 by feeding the webs in a channel larger than the thickness of the webs by means of rollers, e.g. involving prefolding
• CPC Class Codes: Y10T 156/1003 by separating laminae between spaced secured areas [e.g., honeycomb expanding]
• CPC Class Codes: Y10T 156/1007 Running or continuous length work
• CPC Class Codes: Y10T 156/1015 Folding

Abstract

A machine (300) and the process for manufacture of a unique completely pleated product (110) which is made from a continuous, flexible web (311) for the covering of windows and the like. The machinery consists of a production line (300) with at least a screen printing assembly (306), printing phase control apparatus (330), a unique pleating assembly (400) and a folding assembly (500) for stacking and receiving the final product, screen printing and web travel phasing is performed in accordance with standard practices in the industry, while the pleating and folding of the finished product is performed by apparatus designed and constructed by the instant inventors. After predetermined patterns of adhesive or bonding material (212) have been applied to the continuous web (311), it is pleated by a paired roller assembly (400) and, through the use of an air knife assembly (500), folded into a collecting apparatus. The finished product (110) is a completely pleated structure consisting of front and rear pleated faces containing, interstitially, a multi-cellular structure. The finished product realizes a flexible, shading structure which can be compactly collapsed, revealing essentially none of the pleated surfaces. The finished product derives its uniqueness primarily from the fact that it is pleated from a single continuous web and that retroflexing of the web comprises complete folds in, or pleating of, the web.

Claims

1. A machine for making a pleated curtain structure from a single continuously fed length of flaccid material web comprising:

means for continuously feeding a continuous material web into a printing assembly;

coating means for applying one or more coatings in a predetermined pattern to said moving web;

detecting means positioned to detect the position of said coating pattern which was actually applied by said coating means to said moving web;

pleating means for creating pleat creases in said moving web at predetermined locations thereon that are transverse to the length of said web;

pitch adjusting means controlled by said detecting means for dynamically modifying the pitch of the pleats produced by said pleating means while the web is being pleated; and

folding and receiving means to fold the coated and pleated web along said creases while accumulating the pleated web in a confined stack.

2. The machine of claim 1 wherein said folding and receiving means comprises an air knife assembly for dynamically applying opposed streams of air against the opposing sides of the creases web, said air knife assembly comprising a pair of counter-rotating air knives located on opposite sides of the creased web and longitudinally spaced along the moving web path a distance substantially equal to the space between two adjacent and oppositely directed web creases, each of said air knives emitting a narrow elongated stream of air extending substantially the full transverse width of the web, and said air knives rotating to continue to direct said air streams at the web creases as the creases pass said air knives.

3. The machine of claim 1 wherein said receiving means comprises an elongated rectangular box of depth sufficient to accommodate a predesired-length of said pleated web, said box further comprising air evacuation orifices located adjacent to the web entry end of said box to aid in the compacting of said pleated web within said box, said box collecting said pleated web therein and providing thereby an accreting confinement for said web which has been coated with an adhesive bonding pattern between the pleats thereof.

4. The machine of claim 3 further comprising a movable, controllable platform-type base within said box, base position control means for positioning said base along the length of said box interior so that said base may be first presented at said web entry end of said box during the beginning of web filling and gradually withdrawn along the length of said box interior as said box is filled with the folded web.

5. The machine of claim 4 wherein said control means comprise sensors located adjacent to the entry end of said box, pneumatic pressure ducted into said box between a closed bottom end of the box and said movable base, and a retracting cable connected to a stepping motor and said base so that said pneumatic pressure and said mechanical stepping motor assembly cooperate to move said base towards and away from said entry end of said box.

6. The machine of claim 1 wherein said pleating means comprises a pair of counter-rotating opposed cylinders between which the web may be continuously fed, said cylinders including a resilient outer shell, the exterior diameter of said cylinders being continuously adjustable while pleating of the web is in progress;

web creasing means fixed to the exterior of said cylinder shells at circumferentially spaced intervals and extending parallel to the rotational axes of said cylinders;

said pitch adjusting means comprising inflatable bladder means within said cylinder shells and engagable with the inner surface of said cylinder shells to vary the exterior diameter of said cylinder shells in response to variable air pressure supplied to said bladder means;

air supply means connected to the interior of said bladder means for supplying a variable air pressure thereto;

whereby the pitch of said creasing means can be varied by controlling the air pressure supplied to said bladder means, to thereby increase the diameter and circumference of said outer shells.

7. The machine of claim 6 wherein said outer shell of each of said cylinders is resiliently compressible to yieldably receive creasing means on the other of said cylinders to thereby cause the web to be creased by the deflection of said web by said creasing means of one of said cylinders into the locally yielding surface of the other of said cylinders.

8. The machine of claim 7 wherein said bladder means is positioned between said resilient outer shell and a rigid perforated inner shell, the perforations of said inner shell providing a passage for the pitch controlling air to reach the interior of said bladder means from the interior of said inner shell and said air supply means;

said web creasing means being anchored to said inner shell by slidable connecting means which permit said web creasing means to move radially but not circumferentially relative to said inner shell.

9. A method of forming a multi-cellular collapsible shade in the form of a single continuous length of pleated flexible web material comprising the steps of:

coating portions of both faces of a continuously fed web with an adhesive bonding substance in a predetermined pattern, said pattern comprising a plurality of narrow parallel strips extending transversely to the length of the web material;

detecting the precise longitudinal location of said stripes along the moving web;

transversely creasing the moving web at predetermined locations relative to said strips of said bonding pattern to establish a pleat pattern on the web, said creases extending parallel to said adhesive bonding stripes, said creases being created by creasing elements whose registry with the moving web is continuously adjustable as the web passes thereby;

dynamically adjusting the registry of said creasing elements with the moving web while the web is being pleated, as required to continuously maintain said predetermined locations in response to said detecting step;

folding the coated and creased web along said transverse creases and upon itself in alternating opposite directions; and

accumulating a stack of alternatingly directed pleats to form an array of tubular cells each extending transversely to the length of the web, with adjacent cells being joined together by said adhesive bonding strips.

10. The method of claim 9 wherein said folding and accumulating steps include the further steps of:

accumulating said stack in a batcher box; and

evacuating air from the space between adjacent pre-creased and folded pleats by means of air withdrawal orifices located within said batcher box, to thereby enhance the compacting of said web stack in said batcher box.

11. The method of claim 9 wherein said folding and accumulating steps include the further steps of:

accumulating said stack in a batcher box with the first-formed portion of said stack being deposited onto a base which is movable along the length of said batcher box; and

controlling the position of said movable base along the length of said batcher box in such a way that said base moves away from the web entry end of said batcher box as the length of said stack increases, to thereby maintain the newly added portion of said stack at said entry end of said batcher box as said folded web accumulates therein.

12. The method of claim 11 wherein said folding and accumulating steps include the further steps of:

evacuating air from the space between adjacent pre-creased and folded pleats by means of air withdrawal orifices located within said batcher box adjacent the web entry end, to thereby enhance the compacting of said web stack in said batcher box.