US3766813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for cutting sharp corners and notches in layups of fabric and other sheet material
Assignee: Gerber Technology LLC
•
Filing: 1971-08-05
•
Granted: 1973-10-23
•
Expires: 1991-08-05
Abstract
Abstract A layup of sheet material is cut by a cutter having a reciprocating cutting blade with a sharp forward cutting edge. During cutting along a given line of cut the cutting blade extends through the layup during at least a portion of each of its strokes, and when a sharp corner or notch point is reached the blade is rotated while remaining in cutting engagement with the layup to turn the corner or to cut the notch without the blade being first withdrawn from the material or without being moved through a path departing from the desired line of cut.
Inventors
- 👤 D Pearl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:06
CPC Classifications
B; B26; B26D; B26D5/00; B26D5/005; B26F; B26F1/00; B26F1/38; B26F1/3806; B26F1/3813; B26F1/382; B26D7/00; B26D7/01; B26D7/018; Y; Y10; Y10S; Y10S83/00; Y10S83/917; Y10S83/929; Y10S83/936; Y10S83/939; Y10S83/94; Y10S83/941; Y10T; Y10T83/00; Y10T83/04; Y10T83/0605; Y10T83/869; Y10T83/8745
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
217 words
A method for use in cutting a layup of sheet material by means of a cutter having a cutting blade reciprocated along an axis generally perpendicular to the layup being cut and having a forward cutting edge and a rear edge both extending generally parallel to said axis of reciprocation, said method involving the cutting of the layup along a principal line of cut and along a notch line located at a given notch point along said principal line and extending to one side thereof at a relatively sharp angle thereto, said method comprising the steps of advancing said cutting blade, with its cutting edge directed forwardly, forwardly along said principal line while reciprocating it and maintaining it at a fundamental cutting height relative to said layup wherein it extends entirely through said layup during at least a portion of each stroke, when said notch point is reached rotating said blade, while continuing its reciprocation and while maintaining it at said fundamental cutting height, in such a direction as to move said cutting edge away from said notch point along said notch line, thereafter rotating said blade in the opposite direction to bring said cutting edge back to said notch point, and then again advancing said blade forwardly along said principal line away from said notch point.
Claim 2
Independent Claim
217 words
A method for use in cutting a layup of sheet material by means of a cutter having a cutting blade reciprocated along an axis generally perpendicular to the layup being cut and having a forward cutting edge and a rear edge both extending generally parallel to said axis of reciprocation, said method involving the cutting of the layup along a principal line of cut and along a notch line located at a given notch point along said principal line and extending to one side thereof at a relatively sharp angle thereto, said method comprising the steps of advancing said cutting blade, with its cutting edge directed forwardly, forwardly along said principal line while reciprocating it and maintaining it at a fundamental cutting height relative to said layup wherein it extends entirely through said layup during at least a portion of each stroke, when said notch point is reached rotating said blade, while continuing its reciprocation and while maintaining it at said fundamental cutting height, in such a direction as to move said cutting edge away from said notch point along said notch line, thereafter rotating said blade in the opposite direction to bring said cutting edge back to said notch point, and then again advancing said blade forwardly along said principal line away from said notch point.
Claim 3
Dependent Claim
27 words
A method as defined in claim 1 further charaCterized by maintaining said rear edge of said blade on said principal line during said rotation of said blade.
Claim 4
Dependent Claim
30 words
A method as defined in claim 1 further characterized by said step of rotating said blade being accomplished by rotating it about an axis located rearwardly of said cutting edge.
Claim 5
Dependent Claim
28 words
A method as defined in claim 3 further characterized by holding said axis of blade rotation stationary relative to said principal line during said rotation of said blade.
Claim 6
Dependent Claim
24 words
A method as defined in claim 4 further characterized by said axis of rotation being generally coincident with said rear edge of said blade.
Claim 7
Dependent Claim
37 words
A method as defined in claim 1 further characterized by moving said axis of rotation relative to said layup during the rotation of said blade to cause said cutting edge to follow a substantially straight notch line.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |