US3600747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for calender control
Assignee: Bridgestone Firestone Inc
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Filing: 1969-05-21
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Granted: 1971-08-24
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Expires: 1989-05-21
Abstract
Abstract An apparatus for controlling the thickness of material in a calender system. The sheeting roll gap is regulated by a plurality of hydraulic cylinders which are supplied with the precise amount of fluid by a servo valve. An error-measuring device can actuate, for example, a series of pressure switches or a potentiometer circuit to impose a signal on the servo valve which can be made proportional to the speed of the calender to compensate for a lag between the error-measuring device and the calender-positioning control. The apparatus can also be readily adapted to prevent pinch off of the material when the calender stops and to allow facile changes to be made in the specification of the material being calendered.
Inventors
- 👤 John R Mccarty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:46
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/24; B29C43/245; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/68; B29B7/72; B29B7/724
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
74 words
In a calendering device, a system for regulating the position of a calender roll to control the thickness of the output material comprising, a control cylinder for positioning the calender roll, deviation-sensing means for signaling a variation from a desired thickness in the material, regulating means hydraulically coupled to said control cylinder, said regulating means including an intensifier means, and means for energizing said regulating means responsive to a signal from said deviationsensing means.
Claim 2
Dependent Claim
74 words
In a calendering device, a system for regulating the position of a calender roll to control the thickness of the output material comprising, a control cylinder for positioning the calender roll, deviation-sensing means for signaling a variation from a desired thickness in the material, regulating means hydraulically coupled to said control cylinder, said regulating means including an intensifier means, and means for energizing said regulating means responsive to a signal from said deviationsensing means.
Claim 3
Dependent Claim
22 words
A system according to claim 1, wherein said regulating means also includes a flow system actuated by at least one pressure switch.
Claim 4
Dependent Claim
28 words
A system according to claim 1, wherein said means for energizing said regulating means comprises a control circuit having means for generating a voltage proportional to calender speed.
Claim 5
Dependent Claim
35 words
A system according to claim 3, wherein said voltage-generating means is a tachometer generator and said control circuit includes a potentiometer network means having a slide-wire contact responsive to a signal from said deviation-sensing means.
Claim 6
Dependent Claim
23 words
A system according to claim 4, wherein said control circuit includes an integrator means having an output voltage which energizes said intensifier means.
Claim 7
Dependent Claim
15 words
A system according to claim 1 wherein a servo valve means controls said intensifier means.
Claim 8
Dependent Claim
23 words
A system according to claim 6, wherein said regulating means comprises a control circuit having means for generating a voltage proportional to speed.
Claim 9
Dependent Claim
24 words
A system according to claim 7, wherein said control system includes at least one pressure switch responsive to the signal from said deviation-sensing means.
Claim 10
Dependent Claim
23 words
A system according to claim 8, wherein said deviation-sensing means is an air gauge located in a spaced relation with the output material.
Claim 11
Dependent Claim
31 words
A system according to claim 9, wherein said control system includes an integrator means adapted to integrate the input of the voltage-generating means upon the closing of a said pressure switch.
Claim 12
Dependent Claim
18 words
A system according to claim 10, wherein the output of said control system activates said servo valve means.
Claim 13
Dependent Claim
64 words
A system according to claim 1, wherein said intensifier means comprises a metering cylinder having a piston, said metering cylinder being hydraulically coupled to said control cylinder, and a double acting power cylinder having a piston mechanically coupled with the piston of said metering cylinder so that movement of the piston of said power cylinder causes movement of the piston of said metering cylinder.
Claim 14
Dependent Claim
20 words
A system according to claim 12 wherein a servo valve communicates with said power cylinder for controlling the movement thereof.
Claim 15
Dependent Claim
17 words
A system according to claim 13 having switch means for maintaining sAid intensifier in an operative position.
Claim 16
Dependent Claim
36 words
A system according to claim 13 wherein a position feedback loop generates a signal to the input of said servo valve, said feedback signal being proportional to the position of the piston of said power cylinder.
Claim 17
Dependent Claim
31 words
A system according to claim 15 wherein said energizing means includes a control circuit having for generating a voltage proportional to calender speed, and an integrator means controlling said servo valve.
Claim 18
Dependent Claim
107 words
In a calendering device, a system for regulating the position of a calender roll to control the thickness of the output material comprising, a control cylinder for positioning the calender roll, deviation-sensing means for signaling a variation from a desired thickness in the material, regulating means hydraulically coupled to said control cylinder, means for energizing said regulating means responsive to a signal from said deviation-sensing means, and a comparator loop responsive to a means for generating a voltage proportional to speed, said comparator loop detecting the point at which said generated voltage becomes less than a set reference voltage, said comparator loop then activating said regulating means.
Claim 19
Dependent Claim
107 words
In a calendering device, a system for regulating the position of a calender roll to control the thickness of the output material comprising, a control cylinder for positioning the calender roll, deviation-sensing means for signaling a variation from a desired thickness in the material, regulating means hydraulically coupled to said control cylinder, means for energizing said regulating means responsive to a signal from said deviation-sensing means, and a comparator loop responsive to a means for generating a voltage proportional to speed, said comparator loop detecting the point at which said generated voltage becomes less than a set reference voltage, said comparator loop then activating said regulating means.
Claim 20
Dependent Claim
22 words
A system according to claim 17 wherein said voltage-generating means is a tachometer generator and said comparator loop includes a level detector.
Claim 21
Dependent Claim
103 words
In a calendering device, a system for regulating the position of a calender roll to control the thickness of the output material comprising, a control cylinder for positioning the calender roll, deviation sensing means for signaling a variation from a desired thickness in the material, regulating means hydraulically coupled, to said control cylinder, set point potentiometer means controlling the position of said deviation-sensing means controlling the position of said deviation-sensing means with respect to the output material and actuating a memory control system coupled to said regulating means, and means for energizing said regulating means responsive to a signal from said deviation-sensing means.
Claim 22
Dependent Claim
103 words
In a calendering device, a system for regulating the position of a calender roll to control the thickness of the output material comprising, a control cylinder for positioning the calender roll, deviation sensing means for signaling a variation from a desired thickness in the material, regulating means hydraulically coupled, to said control cylinder, set point potentiometer means controlling the position of said deviation-sensing means controlling the position of said deviation-sensing means with respect to the output material and actuating a memory control system coupled to said regulating means, and means for energizing said regulating means responsive to a signal from said deviation-sensing means.
Claim 23
Dependent Claim
28 words
A system according to claim 19 wherein said deviation-sensing means is an air gauge and said set point potentiometer means actuates a motor coupled with said air gauge.
Claim 24
Dependent Claim
19 words
A system according to claim 20 having a feedback potentiometer means responsive to the movement of said air gauge.
Claim 25
Dependent Claim
27 words
A system according to claim 19 wherein said set point potentiometer means includes two potentiometer circuits, said potentiometer circuits supplying a voltage to said memory control system.
Claim 26
Dependent Claim
56 words
A system according to claim 22 wherein said memory control system includes a subtractor means for determining the difference between the voltage from said potentiometer circuits, a switch means, and a memory circuit, so that actuation of said switch means stores the voltage determined by said subtractor in said memory circuit to activate said regulating means.
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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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |