US3892156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife holders for slitter winding machines and the like
Assignee: Johnstone Eng & Mach Co
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Filing: 1974-02-11
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Granted: 1975-07-01
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Expires: 1994-02-11
Abstract
Abstract A pressure fluid operated knife holder comprising a cylinder having a piston and piston rod therein, and a knife head carried by the piston rod. The piston, piston rod and knife head assembly are fluid pressure actuated from an upper limit position to a lower limit position in which a male knife on the head is positioned relative to a female knife. Adjustable means is provided for initially setting the cutting edge of the male knife relative to the female knife in the lower limit position of the assembly. The male knife is supported by a mounting axially movable in the knife head between inner and outer positions to set the male knife in cutting position against the female knife, and the mounting also has limited rocking movement to equalize contact pressure between the male and female knives. Outward axial displacement of the mounting to set the male knife is accomplished by pressure fluid from the cylinder and the connections from the cylinder to the knife head are constructed and arranged so that pressure fluid cannot flow from the cylinder to the knife head until the assembly is in the lower limit position. Pressure fluid admitted to the knife head is vented to atmosphere in all positions of the assembly except said lower limit position.
Inventors
- 👤 Bruce V Johnstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:00
CPC Classifications
B; B26; B26D; B26D5/00; B26D5/02; B26D5/04; B23; B23D; B23D35/00; B23D35/002; B23D35/004; Y; Y10; Y10T; Y10T83/00; Y10T83/768; Y10T83/7751; Y10T83/7809; Y10T83/783; Y10T83/7834; Y10T83/7868; Y10T83/869; Y10T83/8745; Y10T83/8746
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
420 words
A pressure fluid actuated knife holder comprising a cylinder, a piston rod extending axially through said cylinder beyond the ends thereof and having a pressure fluid passage extending coaxially therein, a piston in the cylinder secured on said piston rod, intercooperating means on the piston rod and the cylinder operable to determine retracted and projected limit positions of travel of the piston and rod axially in said cylinder, a knife head on one end of said piston rod for movement therewith between retracted and projected positions, knife support means in said knife head axially shiftable therein between inner and outer positions along an axis perpendicular to the axis of the cylinder, pressure fluid actuatable means in the knife head operable to shift said knife support means from said inner position to an outer position, means in said knife head defining a pressure fluid passage communicating between the coaxial pressure fluid passage in said piston rod and said pressure fluid actuatable means in the knife head, means to admit pressure fluid to the cylinder to actuate said piston from said retracted position to said projected limit position, means in the piston rod adjacent the other end thereof defining a pressure fluid inlet passage therein having an inner opening communicating with the coaxial pressure fluid passage in said piston rod and an outer opening for communication with the cylinder interior, the outer opening of said pressure fluid inlet passage being disposed axially in the piston rod so that said outer opening is normally closed by the cylinder in the intermediate and retracted positions of the piston rod and is open and in communication with the cylinder interior only in the projected limit position, and means in the piston rod defining a vent passage having an inner opening communicating with said coaxial fluid passage therein and an outer opening for communication with the external atmosphere, said vent passage being disposed axially in said piston rod and spaced with respect to the pressure fluid inlet opening therein so that the vent outer opening is closed by the cylinder in the projected limit position of the piston rod and is open to the atmosphere in the intermediate and retracted limit positions of said piston rod, whereby pressure fluid can flow from said cylinder to the knife head to axially shift the knife support from said inner position only in the projected limit position of the piston rod and the knife head is vented to atmosphere in said intermediate and retracted positions of the piston rod.
Claim 2
Dependent Claim
420 words
A pressure fluid actuated knife holder comprising a cylinder, a piston rod extending axially through said cylinder beyond the ends thereof and having a pressure fluid passage extending coaxially therein, a piston in the cylinder secured on said piston rod, intercooperating means on the piston rod and the cylinder operable to determine retracted and projected limit positions of travel of the piston and rod axially in said cylinder, a knife head on one end of said piston rod for movement therewith between retracted and projected positions, knife support means in said knife head axially shiftable therein between inner and outer positions along an axis perpendicular to the axis of the cylinder, pressure fluid actuatable means in the knife head operable to shift said knife support means from said inner position to an outer position, means in said knife head defining a pressure fluid passage communicating between the coaxial pressure fluid passage in said piston rod and said pressure fluid actuatable means in the knife head, means to admit pressure fluid to the cylinder to actuate said piston from said retracted position to said projected limit position, means in the piston rod adjacent the other end thereof defining a pressure fluid inlet passage therein having an inner opening communicating with the coaxial pressure fluid passage in said piston rod and an outer opening for communication with the cylinder interior, the outer opening of said pressure fluid inlet passage being disposed axially in the piston rod so that said outer opening is normally closed by the cylinder in the intermediate and retracted positions of the piston rod and is open and in communication with the cylinder interior only in the projected limit position, and means in the piston rod defining a vent passage having an inner opening communicating with said coaxial fluid passage therein and an outer opening for communication with the external atmosphere, said vent passage being disposed axially in said piston rod and spaced with respect to the pressure fluid inlet opening therein so that the vent outer opening is closed by the cylinder in the projected limit position of the piston rod and is open to the atmosphere in the intermediate and retracted limit positions of said piston rod, whereby pressure fluid can flow from said cylinder to the knife head to axially shift the knife support from said inner position only in the projected limit position of the piston rod and the knife head is vented to atmosphere in said intermediate and retracted positions of the piston rod.
Claim 3
Dependent Claim
44 words
A pressure fluid actuated knife holder as claimed in claim 1 comprising means operable to return the piston and piston rod together with the knife head from the projected limit position to the retracted limit position upon cut-off of pressure fluid to the cylinder.
Claim 4
Dependent Claim
40 words
A pressure fluid actuated knife holder as claimed in claim 2 wherein the means for returning the piston and piston rod from the projected limit position to the retracted limit position comprises an expansion coil spring circumscribing the piston rod.
Claim 5
Dependent Claim
36 words
A pressure fluid actuated knife holder as claimed in claim 1 comprising means operable to return the knife support means to the inner position thereof in the knife head upon venting pressure fluid from the latter.
Claim 6
Dependent Claim
45 words
A pressure fluid actuated knife holder as claimed in claim 4 wherein the means for returning the knife support means to the inner position comprises a plurality of expansion coil springs acting between the knife support means and an adjacent portion of the knife head.
Claim 7
Dependent Claim
40 words
A pressure fluid actuated knife holder as claimed in claim 1 comprising a circular knife journaled in the knife mounting means for rotation about an axis perpendicular to the axis of the cylinder, said knife having a circumferential cutting edge.
Claim 8
Dependent Claim
51 words
A pressure fluid actuated knife holder as claimed in claim 6 whErein the knife mounting means is constructed and arranged for limited pivotal rocking movement in the knife head about a center located on the rotation axis of the knife to permit limited angular deflection of said knife from said axis.
Claim 9
Dependent Claim
52 words
A pressure fluid actuated knife holder as claimed in claim 6 wherein the piston rod includes adjustable means operable to determine the projected limit position of the piston and piston rod with respect to the cylinder and thereby predeterminedly set the projected limit position of the cutting edge of the circular knife.
Claim 10
Dependent Claim
57 words
A pressure fluid actuated knife holder as claimed in claim 8 wherein the adjustable means to determine the projected limit position of the piston and piston rod comprises an adjustment member threaded on a portion of the piston rod at the opposite side of the piston from said knife head and manually adjustable on said piston rod.
Claim 11
Dependent Claim
36 words
A pressure fluid actuated knife holder as claimed in claim 9 wherein the pressure fluid inlet passage from the cylinder interior to the coaxial pressure fluid passage in the piston rod is in the adjustment member.
Claim 12
Dependent Claim
33 words
A pressure fluid actuated knife holder as claimed in claim 9 wherein the vent passage between the coaxial fluid passage in the piston rod and the external atmosphere is in the adjustment member.
Claim 13
Dependent Claim
34 words
A pressure fluid actuated knife holder as claimed in claim 10 wherein the vent passage between the coaxial fluid passage in the piston rod and the external atmosphere is also in the adjustment member.
Claim 14
Dependent Claim
49 words
A pressure fluid actuated knife holder as claimed in claim 7 wherein the limited pivotal rocking movement of the knife mounting means is provided by a peripheral surface thereon of arcuate spherical shape having a radius described from the center of pivotal rocking movement of said knife mounting means.
Claim 15
Dependent Claim
47 words
A pressure fluid actuated knife holder as claimed in claim 9 wherein the intercooperating means operable to determine the retracted and projected limit positions of the piston rod axially in said cylinder comprises axially spaced means on the adjustment member disposed for cooperative engagement with the cylinder.
Claim 16
Dependent Claim
36 words
A pressure fluid actuated knife holder as claimed in claim 2 comprising means operable to return the knife support means to the inner position thereof in the knife head upon venting pressure fluid from the latter.
Claim 17
Dependent Claim
51 words
A pressure fluid actuated knife holder as claimed in claim 15 wherein the knife mounting means is constructed and arranged for limited pivotal rocking movement in the knife head about a center located on the rotation axis of the knife to permit limited angular deflection of said knife from said axis.
Claim 18
Dependent Claim
57 words
A pressure fluid actuated knife holder as claimed in claim 15 wherein the adjustable means to determine the projected limit position of the piston and piston rod comprises an adjustment member threaded on a portion of the piston rod at the opposite side of the piston from said knife head and manually adjustable on said piston rod.
Claim 19
Dependent Claim
34 words
A pressure fluid actuated knife holder as claimed in claim 15 wherein the vent passage between the coaxial fluid possage in the piston rod and the external atmosphere is also in the adjustment member.
Claim 20
Dependent Claim
34 words
A pressure fluid actuated knife holder as claimed in claim 16 wherein the vent passage between the coaxial fluid passage in the piston rod and the external atmosphere is also in the adjustment member.
Claim 21
Dependent Claim
49 words
A pressure fluid actuated knife holder as claimed in claim 19 wherein the limited pivotal rocking movement of the knife mounting means is provided by a peripheral surface thereon of arcuate spherical shape having a radius described from the center of pivotal rocking movement of said knife mounting means.
Claim 22
Dependent Claim
47 words
A pressure fluid actuated knife holder as claimed in claim 20 wherein the intercooperating means operable to determine the retracted and projected limit positions of the piston rod axially in said cylinder comprises axially spaced means on the adjustment member disposed For cooperative engagement with the cylinder.
References Cited (Backward Citations)
US3186281A
Cited
US3380330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |