US3567091A - Arrangements for controlling the lateral position of a web of material - Google Patents

Arrangements for controlling the lateral position of a web of material Download PDF

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Publication number
US3567091A
US3567091A US787898A US3567091DA US3567091A US 3567091 A US3567091 A US 3567091A US 787898 A US787898 A US 787898A US 3567091D A US3567091D A US 3567091DA US 3567091 A US3567091 A US 3567091A
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United States
Prior art keywords
web
amplifiers
pressure
control
sensing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US787898A
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English (en)
Inventor
Duncan J Woolard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mount Hope Machinery Ltd
Mount Hope Machinery Co
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Mount Hope Machinery Ltd
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Publication date
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/003—Circuit elements having no moving parts for process regulation, (e.g. chemical processes, in boilers or the like); for machine tool control (e.g. sewing machines, automatic washing machines); for liquid level control; for controlling various mechanisms; for alarm circuits; for ac-dc transducers for control purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/0204—Sensing transverse register of web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/0204—Sensing transverse register of web
    • B65H23/0212—Sensing transverse register of web with an element utilising fluid flow
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C2700/00—Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
    • D06C2700/10—Guides or expanders for finishing

Definitions

  • One way of performing this control has been to arrange two pneumatic sensing elements adjacent the desired lateral position of one edge of the web.
  • the desired position of the web is such that its edge is between the two sensing elements so that one sensing element indicates the presence of the web while the other indicates the absence of the web.
  • both sensing elements indicate absence of the web
  • the sensing elements are so coupled to a control system that the absence of the web at both sensing elements causes an adjustment device to move the web laterally until one of the sensing elements again indicates the presence of the web.
  • i t i On the other hand, if both sensing elements become covered by the .web and hence indicate its presence, the web has inadvertently moved too far towards the sensing elements. In this situation the adjusting device is made to operate so that the web is driven back towards its desired position whereupon the other of the sensing elements will indicate the absence of the web.
  • a disadvantage of this arrangement is that substantial local discontinuities in the edge of the web tend to be followed by the sensing elements. Generally, in the presence of local edge discontinuities, it is better that the web should follow a straight I line rather than that it should be guided by these irregularities.
  • a general object of the invention is to overcome this problem and provide an improved apparatus for controlling the lateral position of webs of material.
  • 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 which inhibits operation of the adjusting device when receiving a signal from the third sensing element indicating absence of the web.
  • the invention comprises the improvement of a third pneumatically operated sensing element positioned to sense the presence of the web at both of said limits of lateral deviation and connected to said pressure medium supply meansand to said control means which inhibits operation of the adjusting device when receiving a signal from the third sensing element indicating absence of the web.
  • a substantial discontinuity in the edge of the web results in the absence of web at the location of the third sensing element.
  • the fact that both the first and second sensing elements are uncovered by the web would have hitherto resulted in undesired adjustment of the lateral position of the web.
  • the presence of this third sensing element now prevents any adjustment from taking place until the discontinuity has been passed. In this way the web tends to run straight, even in the presence of substantial discontinuities along the edge of the web.
  • the sensing head is in the form of a block having a slot therein through which the web passes
  • the pressure medium supply means is a source of compressed air
  • each sensing element is 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.
  • control means includes a plurality of turbulence amplifiers which are controlled by the changes of pressure sensed by the tappings.
  • FIG. 1 is a plan view of a web, indicating the relative positions of three sensing elements with respect to the desired position of the web;
  • FIG. 2 is a pneumatic circuit diagram of an apparatus for controlling the position of the web.
  • FIG. 1 shows part of a web of material. 26 having an edge 12 incorporating a substantial discontinuity 13 in the form of a slit.
  • the actual material of the web 26 is not important from the point of view of this invention and suffice it to say that the invention can be utilized with any substantially continuous lamellar body of suitable dimensions.
  • the web 26 is drawn past a sensing head incorporating three sensing elements 14, 1S and 16 but for convenience, this situation is represented diagrammatically in FIG. 11; by a series of lines designated 14, 15 and 16 which represent the positions of the sensing elements relative to the web 26 when the latter has moved over a period of time.
  • the first element 14 senses the absence of the web 26
  • the second element 15 senses the presence of the web 26
  • the third element 16 senses the presence of the web 26. Any slight deviation of the edge of the web 26 between the positions of the elements 14 and 15 has no effect on an associated adjusting mechanism, hereinafter described, and thus the web 26 continues to move in a longitudinal direction without adjustment.
  • this element 15 now senses the absence of the web 26 and this in turn will result in a corresponding adjustment of the lateral position of the web 26 until the web 26 again covers the element 15.
  • the substantial discontinuity represented] by the slit 13 passes through the sensing head.
  • the signals from sensing elements 14 and 15 would erroneously indicate that the web 26 had moved away from the second sensing element 15 and thus a correction would be applied to move the web 26 towards the left of the figure.
  • the sensing elements 14' and 15 would correctly sense this deviation from the desired position, and would effect the appropriate correction to move the web 26 back to the right of the figure.
  • a third sensing element 16 is incorporated in the sensing head and this sensing element 16 is positioned so that normally with a web 26 having a straight edge the element 16 always senses part of the web 26.
  • the element 16 sense the absence of the web 26 and this is indicative of a discontinuity rather than a deviation of the position of the web 26 as a whole.
  • the associated control means is such that when the absence of web 26 is signalled by the element 16, the lateral adjustment device does not act to move the web 26 and no lateral adjustment can takeplace until the discontinuity has passed the element 16.
  • the third sensing elements 16 should be so positioned relative to the sensing elements 14 and 15 that it will reliably indicate the presence of a substantial discontinuity in the web 1 1.
  • FIG. 2 A complete apparatus by means of which the sensing and associated control junction may be achieved is indicated diagrammatically in FIG. 2.
  • the apparatus has a sensing head 50 which is constituted by a metal block having an air inlet passage 21 communicating with three nozzles 22, 23 and 24 which form part of the sensing elements 14, 15 and 16 of FIG. 1 respectively.
  • the nozzles 22, 23 and 24 open into a slot 25 in the metal block within which a web 26 is moved.
  • On the opposite face of the slot 25 from the nozzles 22, 23 and 24 are three apertures 27, 28 and 29 extending through the metal block to communicate with the atmosphere.
  • Tappings or passages 31, 32 and 33 extend into the apertures 27, 28 29 and are used to sense changes of pressure in the apertures 27, 28 and 29 and thus to indicate the presence or absence of air flow from the nozzles 22, 23 and 24 to the apertures 27, 28 and 29.
  • a .restrictor 47 is provided in the air supply passage 21 to the head 50 in order to restrict the prevailing pressure in the head 50.
  • the tappings 31, 32 and 33 are connected by way of tubes 34, 35 and 36 respectively to a series of turbulence amplifiers H1, H2, H3, H4 and H forming part of the control means.
  • a filter 37 is fed from pressurized air and serves to pass air under pressure to the remainder of the apparatus.
  • the filter37 feeds air to the restrictor 47 and to a pressure regulator 38 which controls the pressure at which air is supplied into a manifold 39.
  • the manifold 39 provides a common supply all five turbulence amplifiers H1 to H5 and the pressure in the manifold 39 is indicated by a herein in 46.
  • turbulence amplifiers H1 and H5 are used directly to control step-up relays 41 and 42 respectively and these step-up relays in turn control the supply of air to a double acting piston and cylinder unit 43 which is connected to any conventional device 60 for adjusting the lateral position of a web.
  • Devices for adjusting t the lateral position of the web are well known in themselves and for this reason are not described herein detail.
  • the filter 37 also feeds air to a pressure regulator 44 and the pressure at the side of the regulator 44 remote from the filter 37 is monitoredby a gauge 45.
  • the actual supply of air to the unit 43 is by way of sprung-return three-way valves 51, 52.
  • the valves 51, 52 have pilot or control inputs which are fed from the step-up relays 41, 42 respectively.
  • the valves 51, 52 are connected to the regulated air supply provided by the regulator 44.
  • the valves 51, 52 are shown in the position where there is no control signal from either of the relays 41, 42 and there is no air in the system.
  • the valves 51, 52 are connected to the unit 43 and to an exhaust outlet 53, 54 respectively
  • the exhaust outlets 53, 54 are connected to restrictors 55, 56 respectively which lead to the atmosphere.
  • the other side of the piston will exhaust air which can vent to the atmosphere via the valves 51, 52 and restrictors 55, 56.
  • the restrictors 55, 56 control the speed of movement of the piston of the unit 43.
  • the provision of the valves 51, 52 ensure that exhaust air from the unit 43 is not passed back into the step-up relays 41, 42 and thereby. contamination of these relays 41, 42 is prevented.
  • the manually operable jogging valves 48 and 49 are provided to control the turbulence amplifiers H1 and H5 in order to permit manually operable jogging controlled lateral displacement of the web 26.
  • the jogging valves 48, 49 preferably have a pushbutton control.
  • H1 is employed directly to control the opening and closing of the step-up relay 41.
  • the turbulence amplifier H1 is in turn controlled by two further turbulence amplifiers H2 and H3.
  • the turbulence amplifier H5 is employed directly to control the step-up relay 42 and this amplifier H5 is in turn controlled by the turbulence amplifier H4.
  • the five turbulence amplifiers H1 to H5 are each constructed to operate so that in the absence of any control signal, a substantial pressure appears at the output of the amplifier. However, if any control signal is applied to the amplifier this disturbs the flow from the input to the output of the amplifier and a much reduced pressure then appears at its output.
  • the signal on line 35 inhibits operation of amplifier H3 and thus there is no control signal to inhibit operation of amplifier H2.
  • the signal pressure from amplifier H2 inhibits operation of amplifier H1 which in turn results in no signal being applied to step-up relay 41.
  • a problem which frequently arises in the use of pneumatic control systems is that spurious pressure changes caused for example by the opening or closing of a door can sometimes be sufficient to result in undesired operation of a control system.
  • tappings 31, 32 and 33 are well shielded from general air movements they tend to be unaffected by spurious signals and this enables accurate and effective control of the position of the web without interference from spurious air movements.
  • a further advantage of an apparatus made in accordance with the invention is that due to the substantial air flow there is very little tendency for particles of dirt to enter tappings 31, 32 and 33. Moreover the venting of the exhaust of the unit 43 to atmosphere through the valves 51, 52 also prevents contamination by dirt. Thus, incorrect operation due to the presence of dirt in the parts of the control means is unlikely to occur.
  • 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 apressure 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 devia tion 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 thewebpasses, said pressure medium supply means, being a sourceof 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.
  • tappings are connected to turbulence amplifiers forming part of said control means which areeach such as to deliver an output pressure signal when the associated tapping senses a low pressure in its associated aperture.
  • control means comprises further turbulence amplifiers each controlled by the output of one of said first mentioned turbulence amplifiers.
  • 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.
  • 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.
  • first and second manually operable jogging valves 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.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Paper (AREA)
US787898A 1968-08-06 1968-12-30 Arrangements for controlling the lateral position of a web of material Expired - Lifetime US3567091A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB37491/68A GB1192499A (en) 1968-08-06 1968-08-06 Arrangement for Controlling the Lateral Position of a Moving Web of Material

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US3567091A true US3567091A (en) 1971-03-02

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US (1) US3567091A (de)
DE (1) DE1803179A1 (de)
FR (1) FR1592611A (de)
GB (1) GB1192499A (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828669A (en) * 1972-09-08 1974-08-13 Ibm Print line registration indicator for type belt
FR2451876A1 (fr) * 1979-03-21 1980-10-17 Domisse Ets Dispositif de redressement de panneaux de tissu, notamment de panneaux tricotes et son application a une installation de vaporisage de tels tissus
US4844629A (en) * 1987-09-03 1989-07-04 W. H. Brady Co. Electronic labeler with printhead and web sensor combined for concurrent travel, and assemblies of identification devices therefor
US4848632A (en) * 1986-05-02 1989-07-18 Erhardt & Leimer Gmbh Method for guiding a moving web of material
US4920882A (en) * 1987-09-03 1990-05-01 W. H. Brady Co. Electronic labeler with printhead and web sensor combined for concurrent travel, and assemblies of identification devices therefor
US5072414A (en) * 1989-07-31 1991-12-10 Accuweb, Inc. Ultrasonic web edge detection method and apparatus
US5146651A (en) * 1990-12-21 1992-09-15 E. I. Du Pont De Nemours And Company Process and apparatus for tow cross-section measurement and control
US5274573A (en) * 1989-07-31 1993-12-28 Accuweb, Inc. Ultrasonic web edge detection method and apparatus
US5379659A (en) * 1992-02-11 1995-01-10 Bst Servo-Technik Gmbh Method for setting a sensor in a web movement control device
US5575414A (en) * 1994-01-08 1996-11-19 Erhardt & Leimer Gmbh Process and device for guiding and keeping a material web spread
US5813337A (en) * 1996-06-05 1998-09-29 Quad/Tech, Inc. Closed-loop printing control system
US20080002920A1 (en) * 2006-06-14 2008-01-03 Cryovac, Inc. System and method for detecting and registering serrated bags

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3317101A (en) * 1964-08-11 1967-05-02 Du Pont Web aligning apparatus for slave and master webs
US3475956A (en) * 1967-12-01 1969-11-04 Cons Paper Inc Method and apparatus for detecting holes in a moving web

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3317101A (en) * 1964-08-11 1967-05-02 Du Pont Web aligning apparatus for slave and master webs
US3475956A (en) * 1967-12-01 1969-11-04 Cons Paper Inc Method and apparatus for detecting holes in a moving web

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828669A (en) * 1972-09-08 1974-08-13 Ibm Print line registration indicator for type belt
FR2451876A1 (fr) * 1979-03-21 1980-10-17 Domisse Ets Dispositif de redressement de panneaux de tissu, notamment de panneaux tricotes et son application a une installation de vaporisage de tels tissus
US4848632A (en) * 1986-05-02 1989-07-18 Erhardt & Leimer Gmbh Method for guiding a moving web of material
US4844629A (en) * 1987-09-03 1989-07-04 W. H. Brady Co. Electronic labeler with printhead and web sensor combined for concurrent travel, and assemblies of identification devices therefor
US4920882A (en) * 1987-09-03 1990-05-01 W. H. Brady Co. Electronic labeler with printhead and web sensor combined for concurrent travel, and assemblies of identification devices therefor
US5274573A (en) * 1989-07-31 1993-12-28 Accuweb, Inc. Ultrasonic web edge detection method and apparatus
US5072414A (en) * 1989-07-31 1991-12-10 Accuweb, Inc. Ultrasonic web edge detection method and apparatus
US5146651A (en) * 1990-12-21 1992-09-15 E. I. Du Pont De Nemours And Company Process and apparatus for tow cross-section measurement and control
US5379659A (en) * 1992-02-11 1995-01-10 Bst Servo-Technik Gmbh Method for setting a sensor in a web movement control device
US5575414A (en) * 1994-01-08 1996-11-19 Erhardt & Leimer Gmbh Process and device for guiding and keeping a material web spread
US5813337A (en) * 1996-06-05 1998-09-29 Quad/Tech, Inc. Closed-loop printing control system
US20080002920A1 (en) * 2006-06-14 2008-01-03 Cryovac, Inc. System and method for detecting and registering serrated bags
US8157141B2 (en) * 2006-06-14 2012-04-17 Cryovac, Inc. System and method for detecting and registering serrated bags

Also Published As

Publication number Publication date
FR1592611A (de) 1970-05-19
DE1803179A1 (de) 1970-03-05
GB1192499A (en) 1970-05-20

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