US4286882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the automatic, uniform drawing-in of elastomeric material into worm extruders
Assignee: SCHIESSER AG
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Filing: 1978-08-22
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Granted: 1981-09-01
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Expires: 1998-08-22
Abstract
Abstract A method of, and apparatus for, automatically and uniformly drawing-in elastomeric material into worm extruders comprising at least one draw-in roll for the material mixture, arranged in spaced relationship in front of the extruder worm or screw and driven independently of the worm. The draw-in roll is driven in a manner such that it only can transmit a predetermined adjustable rotational moment which is limited towards an upper range, or, if desired, the rotational speed of the draw-in roll is controlled as a function of a maximum upwardly limited pressure prevailing within a draw-in or infeed pocket between the draw-in roll and the worm or screw.
Inventors
- 👤 Walter H. Schiesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:47
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/92; B29C48/285; B29C48/288; B29C48/2888; B29C48/36; B29C48/395; B29C48/47; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/9258; B29C48/03; B29C48/375; B29C48/387; B29C48/465
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
An apparatus for automatically, substantially uniformly drawing-in elastomeric material into a worm extruder, comprising: a driven extruder worm; at least one draw-in roll for mixture material which is to be processed arranged in spaced relationship from and upstream of the extruder worm; variable speed means for driving said draw-in roll independently of said extruder worm; means defining a material draw-in pocket between the draw-in roll and the extruder worm downstream of the draw-in roll; and control means for controlling the drive speed of the draw-in roll such that it can transmit only a predetermined maximum adjustable moment as a function of the pressure up to a predetermined maximum pressure in the draw-in pocket between the draw-in roll and the extruder worm wherein the rotational moment is adjusted in response to said pressure.
Claim 2
Independent Claim
132 words
An apparatus for automatically, substantially uniformly drawing-in elastomeric material into a worm extruder, comprising: a driven extruder worm; at least one draw-in roll for mixture material which is to be processed arranged in spaced relationship from and upstream of the extruder worm; variable speed means for driving said draw-in roll independently of said extruder worm; means defining a material draw-in pocket between the draw-in roll and the extruder worm downstream of the draw-in roll; and control means for controlling the drive speed of the draw-in roll such that it can transmit only a predetermined maximum adjustable moment as a function of the pressure up to a predetermined maximum pressure in the draw-in pocket between the draw-in roll and the extruder worm wherein the rotational moment is adjusted in response to said pressure.
Claim 3
Dependent Claim
50 words
The apparatus as defined in claim 1, further including: at least one additional draw-in roll; drive means for driving the additional draw-in roll in an angular direction opposite to that of the first-mentioned draw-in roll; said two draw-in rolls being spaced from each other to provide therebetween a draw-in gap.
Claim 4
Dependent Claim
19 words
The apparatus as defined in claim 2, wherein: said drive means for the draw-in rolls comprise hydrostatic drive units.
Claim 5
Dependent Claim
45 words
The apparatus as defined in claim 3, further including: pressure measuring means arranged in the draw-in pocket and connected to the drive means for said draw-in rolls in order to control the rotational speed of the draw-in rolls as a function of the measured pressure.
Claim 6
Dependent Claim
15 words
The apparatus as defined in claim 1, wherein: said draw-in roll has a smooth surface.
Claim 7
Dependent Claim
15 words
The apparatus as defined in claim 1, wherein: said draw-in roll has a profiled surface.
Claim 8
Dependent Claim
61 words
The apparatus as defined in claim 1, further including: an additional draw-in roll substantially parallel to said first mentioned draw-in roll; each of said two draw-in rolls having a respective lengthwise axis; said extruder worm having a lengthwise axis; the lengthwise axes of the draw-in rolls being arranged at an angle with respect to the lengthwise axis of the extruder worm.
Claim 9
Independent Claim
98 words
An apparatus for automatically, substantially uniformly drawing-in elastomeric material into a worm extruder, comprising: a driven extruder worm; at least one draw-in roll for material which is to be processed arranged in spaced relationship from and upstream of the extruder worm; means for driving said draw-in roll independently of said extruder worm; and means responsive to the pressure in the elastomeric material adjacent the extruder worm for controlling the drive of the draw-in roll to transmit only a predetermined rotational moment up to a preset maximum for maintaining a uniform feed of elastomeric material to said extruder worm.
Claim 10
Independent Claim
98 words
An apparatus for automatically, substantially uniformly drawing-in elastomeric material into a worm extruder, comprising: a driven extruder worm; at least one draw-in roll for material which is to be processed arranged in spaced relationship from and upstream of the extruder worm; means for driving said draw-in roll independently of said extruder worm; and means responsive to the pressure in the elastomeric material adjacent the extruder worm for controlling the drive of the draw-in roll to transmit only a predetermined rotational moment up to a preset maximum for maintaining a uniform feed of elastomeric material to said extruder worm.
Claim 11
Independent Claim
118 words
An apparatus for automatically, substantially uniformly drawing in elastomeric material into a worm extruder comprising: a driven extruder worm; at least one draw-in roll for material which is to be processed arranged in spaced relationship from and upstream of the extruder worm; means for driving said draw-in roll independently of said extruder worm; means defining a material draw-in space between the draw-in roll and the extruder worm; and means for varying the rotational speed of the draw-in roll as a function of pressure in the draw-in space between the draw-in roll and the extruder worm up to a preset maximum pressure wherein the extruder worm maintains unchanged speed while the speed of said draw-in roll is being varied.
Claim 12
Independent Claim
118 words
An apparatus for automatically, substantially uniformly drawing in elastomeric material into a worm extruder comprising: a driven extruder worm; at least one draw-in roll for material which is to be processed arranged in spaced relationship from and upstream of the extruder worm; means for driving said draw-in roll independently of said extruder worm; means defining a material draw-in space between the draw-in roll and the extruder worm; and means for varying the rotational speed of the draw-in roll as a function of pressure in the draw-in space between the draw-in roll and the extruder worm up to a preset maximum pressure wherein the extruder worm maintains unchanged speed while the speed of said draw-in roll is being varied.
References Cited (Backward Citations)
US1156096A
Cited
US2384521A
Cited
US2411660A
Cited
GB681309A
Cited
US2755506A
Cited
US3155750A
Cited
US3396429A
Cited
US3712773A
Cited
US3636149A
Cited
US3728056A
Cited
JPS4715223U
Cited
US3858857A
Cited
DE2429203A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |