Patent US3788515A successfully refreshed from Google Patents.
US3788515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for guiding and tensioning a web
Assignee: Beazer East Inc
•
Filing: 1972-03-20
•
Granted: 1974-01-29
•
Expires: 1992-03-20
Abstract
Abstract A method for guiding an advancing web of single face corrugated paperboard material and applying tension thereto along its path of advance comprising the steps of applying subatmospheric pressure to a smooth side of the web for tensioning the web, and guiding the web along the path of advance. The preferred apparatus for performing the method comprises a motorized suction device connected to a vacuum chamber for applying the subatmospheric pressure to the smooth side of the web for tensioning the web and guide plates for guiding the web during its contact with the vacuum chamber. By applying suction to the smooth side of the web, flute crush is avoided and no noise is generated by the flutes dragging across a stationary object.
Inventors
- 👤 D Middleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:56
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/24; B65H23/245; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2831; B31F1/2836
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
115 words
Apparatus for guiding an advancing web of single-face corrugated paperboard material and applying tension thereto along its path of advance, comprising: vacuum means for applying subatmospheric pressure to a smooth side of said web for tensioning said web, said vacuum means including: a perforated plate adjacent said smooth side for applying said subatmospheric pressure thereto; and a vacuum chamber having at least one laterally adjustable piston means therein for limiting the volume of said chamber subject to evacuation and for limiting the area of said perforated plate exposed to said subatmospheric pressure to apply said pressure to within the edges of said web; and guide means for guiding said web along said path of advance.
Claim 2
Dependent Claim
115 words
Apparatus for guiding an advancing web of single-face corrugated paperboard material and applying tension thereto along its path of advance, comprising: vacuum means for applying subatmospheric pressure to a smooth side of said web for tensioning said web, said vacuum means including: a perforated plate adjacent said smooth side for applying said subatmospheric pressure thereto; and a vacuum chamber having at least one laterally adjustable piston means therein for limiting the volume of said chamber subject to evacuation and for limiting the area of said perforated plate exposed to said subatmospheric pressure to apply said pressure to within the edges of said web; and guide means for guiding said web along said path of advance.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 wherein said guide means are laterally adjustable along the edges of said web for guiding webs of various widths.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1 wherein said vacuum means includes a damper means for regulating the magnitude of subatmospheric pressure applied to said vacuum means for regulating tension in said web.
Claim 5
Dependent Claim
23 words
The apparatus of claim 1 wherein said vacuum means includes a motorized suction means for creating said subatmospheric pressure in said vacuum means.
Claim 6
Dependent Claim
48 words
The apparatus of claim 1 wherein said piston means includes two simultaneously adjustable laterally opposed pistons at opposite sides of said chamber movable into alignment with the edges of said web to limit the application of subatmospheric pressure to the width of said smooth side of said web.
Claim 7
Dependent Claim
93 words
The apparatus of claim 5 wherein said pistons include: a control shaft means extending laterally through substantially the midportion of each of said pistons, said shaft means having left hand male threads on substantially one-half of said shaft means and right hand male threads on substantially the other half of said shaft means, said male threads engageable with corresponding female threads in each of said pistons, said shaft means being rotatable for simultaneously adjusting each of said pistons toward and away from one another thereby regulating the operating width of said vacuum chamber.
Claim 8
Dependent Claim
21 words
The apparatus of claim 6 wherein said shaft means is connected to a power means for remotely rotating said shaft means.
Claim 9
Dependent Claim
39 words
The apparatus of claim 7 wherein said power means is remotely shut down by a relay means when said pistons reach their minimum closed position for stopping the rotation of said shaft means before said pistons contact Each other.
Claim 10
Dependent Claim
43 words
The apparatus of claim 7 wherein said power means is remotely shut down when said pistons engage a switch means connected to one end of said vacuum chamber for stopping rotation of said shaft means when said pistons reach their maximum opened position.
Claim 11
Dependent Claim
148 words
The apparatus of claim 5 wherein said vacuum chamber includes: two piston restraining means secured to said vacuum chamber and laterally spaced at substantially the midpoint of said vacuum chamber with said shaft means extending through each of said restraining means for restraining said pistons from contacting each other; two piston stop means secured to said vacuum chamber and laterally spaced at each end of said vacuum chamber with said shaft means extending through each of said stop means for stopping said pistons when said pistons are at their maximum separation; and a piston support means on each side of said shaft means for each of said pistons extending through each of said pistons and supported at one end by said restraining means and at the other end by said stop means for guiding and supporting said pistons along their respective paths when said shaft means is rotated.
Claim 12
Dependent Claim
36 words
The apparatus of claim 5 wherein said pistons include a flexible seal means around the outer periphery of said pistons for contacting the inner periphery of said vacuum chamber thereby preventing vacuum loss around said pistons.
Claim 13
Dependent Claim
84 words
The apparatus of claim 7 wherein: said perforated plate includes a slot extending along the width thereof and substantially at the center of its length; each of said pistons includes a strut means connected thereto and extending through said slot to the exterior of said plate; and said guide means includes a plate means connected to each of said struts and movable with said pistons into contact with corresponding edges of said web for guiding the same during its contact with said perforated plate.
Claim 14
Dependent Claim
34 words
The apparatus of claim 12 further including remotely operable power means connected to said pistons for simultaneously positioning said pistons and said plate means to correspond to the width of said web being advanced.
Claim 15
Dependent Claim
12 words
The apparatus of claim 1 wherein said perforated plate is substantially flat.
Claim 16
Dependent Claim
66 words
The apparatus of claim 1 wherein said apparatus further includes: support means attached to each of said vacuum means for spacing said vacuum means above the path of said advancing web; and a pair of rotatable roller means attached to said support means below and at the input and output of said vacuum means for guiding said web in a path parallel to said perforated plate.
Claim 17
Dependent Claim
47 words
The apparatus of claim 1 wherein said guide means includes a plate means in contact with each edge of said web for guiding the same along its path of advance and power means for remotely positioning said plate means for contact with webs of various preselected widths.
Claim 18
Independent Claim
124 words
A method of applying tension to an advancing web of single-face corrugated paperboard material comprising the steps of: advancing said web along a path of advance; guiding continuously advancing successive portions of said web to a position above said path of advance; applying subatmospheric pressure from a vacuum chamber and through a perforated plate to a smooth side of said portions in said position above said path of advance for causing tension in said web following the application of said pressure thereto; and laterally adjusting at least one piston within said vacuum chamber for limiting the volume of said chamber and limiting the area of said perforated plate exposed to said subatmospheric pressure to apply said pressure to within the edges of said web.
Claim 19
Independent Claim
124 words
A method of applying tension to an advancing web of single-face corrugated paperboard material comprising the steps of: advancing said web along a path of advance; guiding continuously advancing successive portions of said web to a position above said path of advance; applying subatmospheric pressure from a vacuum chamber and through a perforated plate to a smooth side of said portions in said position above said path of advance for causing tension in said web following the application of said pressure thereto; and laterally adjusting at least one piston within said vacuum chamber for limiting the volume of said chamber and limiting the area of said perforated plate exposed to said subatmospheric pressure to apply said pressure to within the edges of said web.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |