US3567091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangements for controlling the lateral position of a web of material
Assignee: Mount Hope Machinery Ltd
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Filing: 1968-12-30
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Granted: 1971-03-02
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Expires: 1988-12-30
Abstract
Abstract An apparatus for controlling the lateral position of a web of material, having a sensing head with three pneumatically operated sensing elements each of which senses the presence or absence of the web in the head. First and second sensing elements are nominally disposed with one longitudinal edge of the web therebetween and the third sensing element is disposed inwardly of the element nominally sensing the presence of the web so as to do likewise. Signals from the first and second elements are fed to a control means which activates an adjusting device to maintain the web in a desired lateral position while signal from the third sensing element indicating absence of the web is used to inhibit the operation of the adjusting device.
Inventors
- 👤 Duncan J Woolard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:23
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/003; B; B65; B65H; B65H23/00; B65H23/02; B65H23/0204; B65H23/0212; D; D06; D06C; D06C3/00; D06C2700/00; D06C2700/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
252 words
In an apparatus for controlling the lateral position of a web of material, which apparatus comprises a sensing head through which the web is passed, first and second sensing elements in said sensing head arranged to sense the presence or absence of the web, means for supplying a pressure medium, said sensing elements being so positioned as to define the limits of a range of permitted lateral deviation in the position of one longitudinal edge of the web, control means responsive to signals from said first and second sensing elements, and an adjusting device controlled by said control means to cause movement of the web to maintain the latter in its desired lateral position; the improvement comprising a third pneumatically operated sensing element positioned to sense the presence of the web at both of said limits of lateral deviation and operably connected to said pressure medium supply means and to said control means, and said control means being constructed and arranged to inhibit operation of the adjusting device when receiving a signal from the third sensing element indicating absence of the web, said sensing head being in the form of a block haVing a slot therein through which the web passes, said pressure medium supply means being a source of compressed air, and said third sensing element being in the form of an air emitting nozzle communicating with said slot, an aperture disposed in axial alignment with said nozzle and a tapping extending into said aperture to sense changes in pressure therein.
Claim 2
Dependent Claim
252 words
In an apparatus for controlling the lateral position of a web of material, which apparatus comprises a sensing head through which the web is passed, first and second sensing elements in said sensing head arranged to sense the presence or absence of the web, means for supplying a pressure medium, said sensing elements being so positioned as to define the limits of a range of permitted lateral deviation in the position of one longitudinal edge of the web, control means responsive to signals from said first and second sensing elements, and an adjusting device controlled by said control means to cause movement of the web to maintain the latter in its desired lateral position; the improvement comprising a third pneumatically operated sensing element positioned to sense the presence of the web at both of said limits of lateral deviation and operably connected to said pressure medium supply means and to said control means, and said control means being constructed and arranged to inhibit operation of the adjusting device when receiving a signal from the third sensing element indicating absence of the web, said sensing head being in the form of a block haVing a slot therein through which the web passes, said pressure medium supply means being a source of compressed air, and said third sensing element being in the form of an air emitting nozzle communicating with said slot, an aperture disposed in axial alignment with said nozzle and a tapping extending into said aperture to sense changes in pressure therein.
Claim 3
Dependent Claim
43 words
An apparatus according to claim 1, wherein the tappings are connected to turbulence amplifiers forming part of said control means which are each such as to deliver an output pressure signal when the associated tapping senses a low pressure in its associated aperture.
Claim 4
Dependent Claim
27 words
An apparatus according to claim 2, wherein the control means comprises further turbulence amplifiers each controlled by the output of one of said first mentioned turbulence amplifiers.
Claim 5
Dependent Claim
39 words
An apparatus according to claim 3, wherein the outputs of two of the turbulence amplifiers control two step-up relays which in turn can move the piston of a double-acting piston and cylinder unit operably associated with said adjusting device.
Claim 6
Dependent Claim
47 words
An apparatus according to claim 4, wherein spring-return three-way valves are interposed between the piston and cylinder unit and the step-up relays to allow the exhaust of said unit to vent to atmosphere when the piston thereof is displaced by operation of one of said step-up relays.
Claim 7
Dependent Claim
29 words
An apparatus according to claim 4, wherein manually operable jogging valves are provided which are connected to said two turbulence amplifiers so as to directly control the operation thereof.
Claim 8
Dependent Claim
22 words
An apparatus according to claim 3, wherein the turbulence amplifiers are supplied with pressurized air from multiple outlets of a common manifold.
Claim 9
Dependent Claim
25 words
An apparatus according to claim 7, wherein the input of pressurized air to said manifold is by way of a filter and a pressure regulator.
Claim 10
Dependent Claim
55 words
An apparatus according to claim 5, wherein the turbulence amplifiers are supplied with pressurized air from multiple outlets of a common manifold, the output of which is fed with pressurized air from a filter and a pressure regulator, and the three-way valves are fed with pressurized air from a further regulator connected to said filter.
Claim 11
Dependent Claim
23 words
An apparatus according to claim 5, wherein the three-way valves are fed with pressurized air by way of a regulator and a filter.
Claim 12
Dependent Claim
39 words
An apparatus according to claim 9, wherein the exhaust outlet of each of the three-way valves communicates with the atmosphere via a pressure restrictor which controls the speed of displacement of the piston of said piston and cylinder unit.
Claim 13
Dependent Claim
20 words
An apparatus according to claim 1, wherein the pressurized air supplied to said nozzles is fed through a pressure restrictor.
Claim 14
Dependent Claim
151 words
An apparatus according to claim 1, wherein the control means has five turbulence amplifiers each with a pressurized air input and a control input, the presence or absence of which causes an output pressure signal to be absent or present respectively, the outputs of a first and a fifth of said amplifiers being used to control the operation of a double-acting piston and cylinder unit operably associated with said adjusting device, the tappings forming part of the first and the second missing sensing elements being connected to the control inputs of a fourth and a third amplifier respectively and the tapping forming part of the third sensing element being connected to the control input of the second amplifier and the control input of the fourth amplifier, and wherein the outputs of the second, third and fourth amplifiers are connected to the control inputs of the first, second and fifth amplifiers respectively.
Claim 15
Dependent Claim
68 words
An apparatus according to claim 13, wherein first and second manually operable jogging valves are provided having a pressurized air inlet and an outlet which is pressurized when the valve is manually actuated, the first valve having its output connected to the control inputs of the second and fifth amplifiers and the second valve having its output connected to the control inputs of thE first and fourth amplifiers.
References Cited (Backward Citations)
US3317101A
Cited
US3475956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |