Patent US3894459A successfully refreshed from Google Patents.
US3894459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thread cutters
Assignee: APAG APPARATEBAU AG
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Filing: 1974-08-12
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Granted: 1975-07-15
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Expires: 1994-08-12
Abstract
Abstract A thread cutter for automatically severing filaments, particularly for use on texturing machines, comprises a housing in which a filament travels with some clearance past a stationary pinching device and a stationary knife. Operation of an electromagnet releases a carriage, carrying both a second pinching device and a second knife, to the action of a spring so that the filament is pinched between the two pinching devices while being kept free of the knife edges. Continued movement of the carriage results in the filament being cut between the knives and one of the filament ends being clamped between abutment faces on the pinching devices. Projections are provided on the moving pinching device for limiting the lateral movement of the thread during the pinching and cutting. The stationary knife edge is curved and the edge of the moving knife, which is spring pressed on to the stationary knife, is straight, the arrangement being such that the knife edges makes instananeous contact at a single point which travels along the knife edges as the carriage moves from its initial to its final position.
Inventors
- 👤 Georg Deppe
- 👤 Gottfried Kurt
- 👤 Kurt Faes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:13
CPC Classifications
D; D03; D03D; D03D47/00; B; B65; B65H; B65H54/00; B65H54/70; B65H54/71; B65H2701/00; B65H2701/30; B65H2701/31; Y; Y10; Y10T; Y10T83/00; Y10T83/566; Y10T83/5669; Y10T83/5733; Y10T83/576; Y10T83/5769; Y10T83/5778; Y10T83/869; Y10T83/8752; Y10T83/8753; Y10T83/8776; Y10T83/8782; Y10T83/8821; Y10T83/8854
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
255 words
A thread cutter for automatically severing filaments, particularly for use on texturing machines, including a housing, a first cutting knife having a cutting edge and a first pinching device having an abutment surface mounted in spaced relationship on said housing, said housing, said first cutting knife and said first pinching device being arranged for a filament to travel past said cutting edge and said abutment surface, a carriage mounted for to-and-fro movement with respect to said first cutting knife and said first pinching device on the side of said filament remote therefrom, a second cutting knife having a cutting edge and a second pinching device having an abutment surface both mechanically coupled with said carriage and movable together with said carriage to effect cutting, said second cutting knife and said second pinching device being positioned in the direction of movement of said carriage with said second pinching device leading said second knife, whereby on movement of said carriage a predetermined distance from an initial position the filament is first pinched and kept free of said knife edges by said pinching devices and on further movement of said carriage the filament is cut by said knives and some portion of the filament is gripped by said abutment faces, and guiding means on one of said pinching devices for limiting the transverse movement of the filament throughout the cutting thereof, said cutting edges of said knives being formed so that throughout the cutting movement of said second knife there is only one contact point between said knivEs.
Claim 2
Dependent Claim
255 words
A thread cutter for automatically severing filaments, particularly for use on texturing machines, including a housing, a first cutting knife having a cutting edge and a first pinching device having an abutment surface mounted in spaced relationship on said housing, said housing, said first cutting knife and said first pinching device being arranged for a filament to travel past said cutting edge and said abutment surface, a carriage mounted for to-and-fro movement with respect to said first cutting knife and said first pinching device on the side of said filament remote therefrom, a second cutting knife having a cutting edge and a second pinching device having an abutment surface both mechanically coupled with said carriage and movable together with said carriage to effect cutting, said second cutting knife and said second pinching device being positioned in the direction of movement of said carriage with said second pinching device leading said second knife, whereby on movement of said carriage a predetermined distance from an initial position the filament is first pinched and kept free of said knife edges by said pinching devices and on further movement of said carriage the filament is cut by said knives and some portion of the filament is gripped by said abutment faces, and guiding means on one of said pinching devices for limiting the transverse movement of the filament throughout the cutting thereof, said cutting edges of said knives being formed so that throughout the cutting movement of said second knife there is only one contact point between said knivEs.
Claim 3
Dependent Claim
42 words
A thread cutter according to claim 1, in which said knife edge of one of said knives is straight and said knife edge of the other of said knives is curved, and in which the movement of said movable knife is rectilinear.
Claim 4
Dependent Claim
66 words
A thread cutter according to claim 1, including a spring interposed between said second knife and said carriage whereby said second knife is articulated to said carriage, said spring being operative to press a surface of said second knife against a surface of said first knife, the contacting surfaces of said knives being inclined to one another transversely to the direction of movement of said carriage.
Claim 5
Dependent Claim
66 words
A thread cutter according to claim 1, in which said knife edge of said second knife is arranged obliquely with respect to the direction of movement of said carriage and in which said knife edge of said first knife is curved substantially in the shape of an L, said second knife being mounted at all times to overlap one limb of said substantially L shaped knife.
Claim 6
Dependent Claim
34 words
A thread cutter according to claim 1, in which said guiding means comprise two projections respectively mounted on opposite sides of said second pinching device and projecting forwards therefrom towards said first pinching device.
Claim 7
Dependent Claim
39 words
A thread cutter according to claim 1, in which said second pinching device includes a pinching spring mounted to pinch the filament against said first pinching device prior to the engagement of the filament between said two abutment faces.
Claim 8
Dependent Claim
32 words
A thread cutter according to claim 1, in which one of said pinching devices is resiliently or rotatably mounted to yield when pinching a filament, thereby compensating for differences in filament diameters.
Claim 9
Dependent Claim
43 words
A thread cutter according to claim 4, including a member provided with a projection, remote from said limb which said second knife overlaps, for preventing the filament from separating from the other limb of said substantially L shaped first knife prior to cutting.
Claim 10
Dependent Claim
23 words
A thread cutter according to claim 3, in which said spring is a leaf spring formed in one piece with said second knife.
Claim 11
Dependent Claim
22 words
A thread cutter according to claim 6, in which said pinching spring is formed in one piece with said second pinching device.
References Cited (Backward Citations)
US3322013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |