Patent US884125A successfully refreshed from Google Patents.
Patent US3835741A successfully refreshed from Google Patents.
US3835741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for cutting sheet material
Assignee: Sentralinstitutt for Industriell Forskning
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Filing: 1972-06-15
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Granted: 1974-09-17
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Expires: 1992-06-15
Abstract
Abstract A cutterhead for mounting in a numerically controlled machine moving the head in a desired path along a cardboard or thin metal sheet material. The cutter head has a cutting tool in the form of a punch having a circular cross-section and reciprocating at a frequency of at least 25,000 cycles per minute.
Inventors
- 👤 G Anderson
- 👤 W Eriksen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:33
CPC Classifications
B; B26; B26D; B26D5/00; B26D5/08; B26F; B26F1/00; B26F1/32; B26F1/34; B26F1/38; B26F1/3806; B26F1/3813; B26F1/382; B26F2001/3893; Y; Y10; Y10S; Y10S83/00; Y10S83/916; Y10T; Y10T83/00; Y10T83/162; Y10T83/173; Y10T83/263; Y10T83/869; Y10T83/8742; Y10T83/929; Y10T83/9411; Y10T83/9423; Y10T83/9454
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A device for cutting sheet material comprising a stationary flat support of yielding material on which the sheet material rests, a cutter head having a cutting tool, means mounting the cutting tool for high-speed reciprocation substantially normal to the sheet material resting on the flat support, said cutting tool removing bits of the sheet material and being pressed slightly into the support material, means mounting the cutter head for movement parallel with the sheet material, said movement being automatically controlled along two coordinates in accordance with a desired cutting line, and said cutting tool being constituted by a punch having an approximately circular cross-section and cutting equally well in all directions, whereby the cutting may be effected along the desired cutting line without rotating the tool about the axis of reciprocation.
Claim 2
Independent Claim
131 words
A device for cutting sheet material comprising a stationary flat support of yielding material on which the sheet material rests, a cutter head having a cutting tool, means mounting the cutting tool for high-speed reciprocation substantially normal to the sheet material resting on the flat support, said cutting tool removing bits of the sheet material and being pressed slightly into the support material, means mounting the cutter head for movement parallel with the sheet material, said movement being automatically controlled along two coordinates in accordance with a desired cutting line, and said cutting tool being constituted by a punch having an approximately circular cross-section and cutting equally well in all directions, whereby the cutting may be effected along the desired cutting line without rotating the tool about the axis of reciprocation.
Claim 3
Dependent Claim
65 words
The cutting device as claimed in claim 1 in which a means for reciprocating the cutting tool is a power source permitting movement of the cutting tool at a frequency of at least 25,000 cycles per minute, whereby a small cross-section of the punch and a cutting speed of at least 10 meter per minute can be obtained without the cut edge becoming too uneven.
Claim 4
Dependent Claim
59 words
The cutting device as claimed in claim 1 in which said means mounting the cutter head for movement parallel with the sheet material is a numerically controlled drafting machine having a drafting head, the cutter head being attached to said drafting head and said stationary flat support being attached to a drafting table of said numerically controlled drafting machine.
Claim 5
Dependent Claim
61 words
The cutting device as claimed in claim 1 in which an air motor having a shaft defines the means for reciprocating the cutting tool, an eccentric pin on the shaft of the air motor, a connecting rod mounted on the eccentric pin, the tool having an upper end and means connecting the upper end of the tool of the connecting rod.
Claim 6
Dependent Claim
67 words
The cutting device as claimed in claim 4 including an upper bearing for the connecting rod, said upper bearing being mounted on the eccentric pin and provided with a recess exposing a portion of the eccentric pin, and a porous material saturated with a lubricant positioned so as to be contacted by the exposed portion of the eccentric pin during rotation thereof for lubricating the upper bearing.
Claim 7
Dependent Claim
52 words
The cutting device as claimed in claim 1 including mounting means for the punch located at such a distance from the lower end of the punch to allow elastic yielding thereof in accordance with the movement of the cutter head during the period of engagement of the punch with the sheet material.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |