US3768122A - Closed loop carding machine control - Google Patents

Closed loop carding machine control Download PDF

Info

Publication number
US3768122A
US3768122A US00218212A US3768122DA US3768122A US 3768122 A US3768122 A US 3768122A US 00218212 A US00218212 A US 00218212A US 3768122D A US3768122D A US 3768122DA US 3768122 A US3768122 A US 3768122A
Authority
US
United States
Prior art keywords
fluidic
signal
pneumatic
strand
closed loop
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
US00218212A
Other languages
English (en)
Inventor
W Rauch
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.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US3768122A publication Critical patent/US3768122A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions

Definitions

  • ABSTRACT A closed loop fluidic control system for carding machines including a sliver sensor means for monitoring a parameter of the sliver passing therethrough, fluidic signal means connected to the sliver sensor means for producing pneumatic output signals indicating variations in the parameter of the sliver being monitored, control means connected to the fluidic signal means for receiving therefrom the pneumatic output signals produced thereby, actuator means operated by the control means in accord with the pneumatic output signals received by the latter, and means interconnecting the actuator means to the speed transmission drive of the carding machine whereby when the parameter of the sliver being monitored is of a first magnitude the actuator means effectuates a first change in the speed transmission drive means thereby reducing the speed of the carding machine and when the parameter of the sliver being monitored is of a second magnitude the actuator means effectuates a second change in the speed transmission drive means thereby increasing the speed of the carding machine.
  • electromechanical systems Insofar as there are mechanical components operating in the aforereferenced prior art electromechanical systems, these latter systems have a tendency to be subject to the same disadvantages noted hereinabove as' being found in mechanical systems.
  • electromechanical systems normally possess some advantages over mechanical systems particularly with regard to reliability in operation and speed of response. That is the electrical components employed in these systems generally permit a faster speed of response such that control functions can be initiated much more rapidly than is possible with pure mechanical systems.
  • barring electrical power failures attributable to non-system causes, the uninterrupted operating life of electrical systems is generally better than with mechanical systems.
  • a further object of the present invention is to provide such a closed loop fluidic control system for controlling a carding machine to produce slivers of uniform weight.
  • a still further object of the present invention is to provide such a closed loop fluidic control system for controlling a carding machine wherein at least a 2 to 1 reduction in sliver weight variations is obtainable over that heretofore possible from prior art systems.
  • Yet another object of the present invention is to pro vide such a closed loop fluidic control system which is characterized by reliability of operation, speed of response, and relatively long life.
  • a closed loop fluidic control system preferably for use with machines of the texile industry such as carding machines.
  • the closed loop fluidic control system includes a sliver sensor means for monitoring a parameter of the sliver passing therethrough.
  • Fluidic signal means are provided connected to the sliver sensor means for producing pneumatic output signals indicating variations in the parameter of the sliver being monitored.
  • Pneumatic control means are connected to the fluid signal means for receiving therefrom .the pneumatic output signals produced by the fluidic signal means.
  • Pneumatic actuator means are operated by the pneumatic control means in accord with the pneumatic output signals received by thelatter from the fluidie signal means.
  • Means are provided interconnecting the pneumatic actuator means to the speed transmission drive means of the carding machine whereby when the parameter of the sliver being monitored is of a first magnitude the pneumatic actuator means effectuates a first change in the speed transmis sion drive means thereby reducing the speed of the carding machine and when the parameter of the sliver being monitored is of a second magnitude the pneumatic actuator means effectuates a second change in the speed transmission drive means thereby increasing the speed of the carding machine.
  • FIGURE is a schematic representation of a closed loop fluidic control system constructed in accordance with the present invention.
  • a closed loop fluidic control system constructed in accord with the present invention.
  • the control system shown is capable of controlling the operation of a textile machine (elements of which are shown in the drawing) to ensure the production therefrom of strand-like material 110 uniformly'having a desired parameter.
  • the closed loop fluidic control system 10 preferably includes a fluid supply filter-regulator portion 11.
  • the fluid supply filterregulator portion 11 receives a fluid such as air under suitable pressure through pipe means 13 from a suitable fluid power supply (not shown).
  • a suitable fluid power supply not shown.
  • the air may be supplied from a suitable shop air system commonly available in most industrial plants.
  • shop air shop air
  • the fluid power supply for the closed loop fluidic control system may be supplied from any other source such as a self-contained bottled supply of air, etc.
  • the fluid power supply is fed to a first filter means 14 which includes a coarse filter which functions to remove large size, normally solid impurities which may be present in the fluid flow from the power supply.
  • a pressure regulator 16 preferably suitably equipped with an exposed pressure gage 17.
  • the fluid being supplied from the power supply source is at a pressure in the order of 100 psi.
  • the pressure regulator 16 functions to reduce the pressure of the fluid flow to a predetermined operating pressure of approximately 60 psi.
  • the pressure regulator 16 serves to dampen any wide variations in supply pressure which might otherwise occur. That is, the pressure regulator 16 is capable of maintaining the fluid flow therefrom at substantially a uniform pressure.
  • fluidic signal means 28 further includes an output means 29, a first signal output means 30, a second signal output means 31, and preferably a pair of indicating lights 32 and 33, respectively.
  • components housed within the enclosure for fluidic signal means 28 are the components (not shown) of a fluid signal generating and amplifying circuits of the type which is described and illustrated in copending patent application, Ser. No. 130,635, filed Apr. 2, 1971 in the name of H.
  • sensor means 34 preferably comprises what is commonly referred to in the art as a trumpet sensor. That is, sensor means 34 takes the form of a cylindrically shaped, hollow member capable of receiving strandlike material 110 such as a sliver produced by a carding machine. Further as illustrated in the drawing the sens'or means 34 may be provided at one end thereof with a funnel-shaped guide 36 to assist in inserting and guiding the strand-like material as it passes through the hollow interior of the sensor means 34.
  • the mode of operation of the sensor means 34 is as set forth in the following description thereof.
  • One end of a continuous length of strand-like material 110 is inserted into the funnel-shaped end 36 of sensor head 34.
  • fluid supplied through pipe means 35 is blown thereagainst.
  • air is the fluid being supplied to sensor means 34, the air is permitted to exit to the atmosphere from either end of the sensor means 34.
  • the pressure of the fluid in the pipe means 35 varies in accordance with the resistance that the fluid encounters in its passage through the sensor means 34.
  • the amount of resistance which the fluid encounters is directly related to the dimensional parameters of the strand-like material passing through sensor means 34.
  • the back pressure in the pipe means 35 it is possible by measuring the back pressure in the pipe means 35 to detect variations in the dimensional parameters of the strand-like material. More particularly, in accord with the present invention, it is possible to measure variations in the density of a sliver as it passes through sensor means 34. These variations are sensed in terms of the back pressure in pipe means 35 and generate corresponding signals in fluidic signal means 28. Normally it is found desirable to also amplify these signals before they leave the fluidic signal means 28. As noted hereinabove the fluid signal generating and amplifying circuitry described in the aforereferenced copending patent application may be employed to accomplish the above-described functions.
  • fluidic signal means 28 is provided with a first signal output means 30 and a second signal output means 31.
  • first signal output means 30 When the density of the sliver passing through sensor means 34 is sensed to be of a first magnitude, a corresponding signal reflecting the existence of this condition is generated and amplified by fluidic signal means 28.
  • This signal is then sent from first signal output means 30 through pipe means 37 to the-input port 33 of a first three-way valve 39.
  • one of the lights 32 and 33 is illuminated to provide a visual indication that the density of the sliver has varied in a first direction from the predetermined desired magnitude.
  • the circuitry of fluidic signal means 28 is conditioned such that a signal will be generated when the density of the sliver is sensed to be less than a predetermined desired magnitude and such that another signal will be generated when the density of the sliver is sensed to be more than the predetermined desired magnitude. Further, when the density of the sliver is of the predetermined desired magnitude no signal is generated by the fluidic signal means 28 and therefore no signal is transmitted to either three-way valve 39 or three-way valve 42. It should also be noted that only one of the aforesaid three conditions will exist at any given time.
  • the three-way valves 39 and 42 employed in the closed loop fluidic control system are each valves of the type which are capable of accepting a low pressure fluid signal. Such valves are well-known in the art and accordingly it is not deemed necessary for an understanding of the present invention that the construction of these valves be further described herein or illustrated in the drawing for this application.
  • each of the three-way valves 39 and 42 further includes a supply port 43 and 44, respectively, and an output port 45 and 46, respectively.
  • the supply ports 43 and 44 are interconnected by means of pipe means 47.
  • the supply flow for the three-way valves 39 and 42 is provided from the power supply source (not shown) as is employed to supply fluid to the fluidic signal means 28.
  • the fluid which leaves pressure regulator 16 flows through pipe means 13 to junction 19 whereat a portion of the fluid flows through pipe means 22 to second filter means 23 and therefrom through pipe means 24, junction 25 and pipe means 26 to inlet means 27 of fluidic signal means 28.
  • the other portion of the fluid flows from junction 19 through pipe means 20 to oiler 21. It is this latter portion of the fluid which is supplied to the supply ports of the three-way valves 39 and 42. More specifically, this latter portion of the fluid which has oil entrained therein as it flows through the oiler 21 flows through pipe means 48 to junction 49 whereat pipe means 48 is joined to pipe means 50, through pipe means 50 to junction 51 and therefrom through pipe means 52 to junction 53 whereat pipe means 52 is joined to pipe means 47. From pipe means 47 the fluid flows through supply ports 43 and 44 into three-way valves 39 and 42, respectively.
  • outlet ports 45 and 46 of three-way valves 39 and 42, respectively, are each connected by means of pipe means 54 and 55, respectively, to an actuator means 56.
  • the latter actuator means 56 in accordance with the preferred embodiment of the invention comprises a pneumatic actuator, i.e., an air cylinder housing a piston-like member 57 having one end thereof suitably affixed to a lever 58 such as to permit some degree of movement relative thereto.
  • the piston-like member 57 is suitably mounted in the pneumatic actuator means 56 such that when fluid flows from outlet port 46 of three-way valve 42 through pipe means to the actuator means 56, the fluid causes the piston-like member 57 to move inwardly into the actuator means 56.
  • lever 58 is suitably connected to lever 61 which has one end pivotably mounted to a fixed support 62 and hsan idler pulley 63 movably supported at its other end.
  • the idler pulley 63 coacts with the variable speed drive transmission 64 of a textile machine (elements of which are shown in the drawing) in a manner to be described with more particularity hereinafter.
  • the speed drive transmission 64 consists of a fixed V-belt pulley 65 driven from the doffer shaft 66, and which in turn through V-belt 67 drives a variable pitch pulley 68 which has its shaft 68a connected to variable speed means 68b through suitable gearing (not shown).
  • Doffer shaft 66 is connected to constant speed delivery means 66a through suitable gearing (not shown).
  • Variable speed feed means 68b, constant speed delivery means 66a and other means inserted therebetween at the breakaway 112 in material are provided by any well known standard machine such as a carding machine of a type shown in U.S. Pat. No. 3,644,964 or any other suitable type of machine.
  • the idler pulley 63 is mounted on the end of lever 61 so as to extend between the drive V-belt pulley 65 and the variable pitch V-belt pulley 68.
  • idler pulley 63 is actuated by pneumatic actuator means 56 such as to engage and press against the V-belt 67 forcing the latter to change path configuration changing the variable pitch V-belt pulley contact with the V-belt to a varying radius thereby increasing or decreasing the speed ratio between the variable pitch pulley 68 and the fixed pitch pulley 65 and thus respectively between feed rollers 68b and constant speed rollers 66a thereby causing a corresponding change in a characteristic of strand like material 1 10 passing therethrough which characteristic is monitored by sensor means 34.
  • a hydraulic snubber 69 is suitably attached in a manner wellknown in the art to the pneumatic actuator means 56.
  • the snubber 69 comprises an air actuated locking piston (not shown) which functions to limit the extent of movement of the piston-like member 57.
  • the snubber 69 has associated therewith a stop check valve 70 which in turn is controlled by a three-way valve 71 to which it is connected by pipe means 72.
  • the threeway valve 71 is preferably of the type capable of accepting a high pressure fluid signal. Inasmuch as the construction of such valves is conventional and is wellknown to those skilled in the art, it is not deemed necessary to include herein any detailed description thereof or illustration thereof apart from the description which follows immediately hereinafter.
  • the threeway valve 71 includes a supply port 73, a signal input port 74 and an output port 75. Referring to the drawing, it can be seen therefrom that fluid is supplied to supply port 73 of three-way valve 71 from oiler 21 through pipe means 48,junction 49, pipe means 50 and junction 51. Further it can be seen that the signal input port 73 of three-way valve 71 is connected through pipe means 76 and junction 77 to pipe means 54 and thereby to the output port 45 of three-way valve 39, and that pipe means 72 connects output port 75 of three-way valve 71 to the inlet of stop check valve 70.
  • the small amount of oil which is added to the portion of the fluid which flows to three-way valves 39, 42 and 71, stock check valve 70, hydraulic snubber 69 and pneumatic actuator means 56 by the oiler 21 as the fluid flows therethrough is designed to satisfy at least in part the lubrication requirements of the various operating components of the aforementioned valves, snubber and actuator means.
  • the oiler 21 and its attendant function of entraining oil in the fluid passing therethrough may be omitted if so desired.
  • an adjustment means 78 is preferably provided.
  • the adjustment means 78 comprises a needle valve (not shown) by means of which the desired rate at which piston-like member 57 moves may be preset. Further by rotation of the knurled knob 79 this velocity of movement rate control may be periodically adjusted as needed.
  • strand-like material from an industrial machine such as a sliver from a textile machine is made to pass through sensor means 34 wherein one of the dimensional parameters of the material such as for example the density thereof is continuously monitored as it passes through the sensor means 34.
  • the fluidic signal means 28 which senses the back pressure in pipe means 35 of the fluid being supplied to sensor means 34.
  • pressure of the fluid in the pipe means 35 varies in accordance with the resistance that the fluid encounters in its passage through the sensor means 34. Since the amount of resistance which the fluid encounters is directly related to the dimensional parameters of the strand-like material passing through sensor means 34, it is possible by measuring the back pressure in the pipe means 35 to detect variations in the dimensional parameters such as the density of the strand-like material. When the density of the strand-like material passing through sensor means 34 is sensed to be of a first magnitude, a corresponding signal reflecting the existence of this condition is generated and amplified by fluidic signal means 28. This signal is then sent from first signal output means 30 to the pneumatic control means including three-way valve 39.
  • fluidic signal means 28 when the density of the strand-like material passing through sensor means 34 is sensed to be of a second magnitude, a corresponding signal reflecting the existence of this condition is generated and amplified by fluidic signal means 28. This signal is then sent from second signal output means 31 to the pneumatic control means including three-way valve 42. Further, when the density of the strand-like material is of the predetermined desired magnitude no signal is generated by the fluidic signal means 28 and therefore no signal is transmitted to the pneumatic control means. In addition to providing the aforedescribed digital pneumatic output, the fluid signal means 28 also provides a visual electrical output by means of lights 32 and 33.
  • the operation of lights 32 and 33 is such that one of these lights is illuminated when an output is provided at first signal output means 30 while the other light is illuminated when an output is provided at second signal output means 31.
  • the aforesaid digital pneumatic output signals sent from fluidic signal means 28 are utilized to drive the pneu matic actuator means 56 through the pneumatic control means including the low to high pressure three-way pneumatic valves 39 and 42.
  • the actuator means 56 is connected to the variable speed transmission in such a manner that when the density of the strand-like material is sensed to be above a desired magnitude a first signal is sent to the pneumatic control means which actuates the actuator means 56 to cause the latter to effect a.
  • a second signal is sent to the pneumatic control means which actuates the actuator means 56 to cause the latter to effect a change in the speed transmission to produce an increase in the speed of variable speed feed means 68b.
  • a hydraulic snubber 69 with settable velocity rate control is attached to the actuator means 56 to allow adjustment of system response to achieve a stable system.
  • a stop check valve is preferably used in association with the hydraulic snubber 69 to prevent any motion of the pneumatic actuator means 56 when no signal is present from the fluidic signal means 28.
  • each of pipe means 26 and pipe means 50 has an unconnected end 260 and 50a, respectively. It is contemplated within the scope of the present invention that the end 26a of pipe means 26 as well as the end 50a of pipe means 50 may be employed to connect the power supply source (not shown) to other installafluidic control system for controlling the operation of a machine to produce therefrom strand-like material uniformlyhaving the desired parameter. Further, the mode of operation of the closed loop fluidic control system of the instant invention is such that changes in the operating conditions of the machine are effectuated in response to the sensing of variations in the parameter of the strand-like material being monitored.
  • the closed loop fluidic control system is capable of controlling a carding machine to produce slivers of uniform weight. Moreover with the closed loop fluidic control system of the present invention at least a2 to 1 reduction in sliver weight variations is obtainable over that heretofore possible from prior art system s. Finally, in accord with the present invention there has been provided a closed loop fluidic control system which is characterized by reliablity of operation, speed of response, and relatively long life.
  • a closed loop fluidic control system having constant speed delivery means for controlling the operation of variable speed feed means to produce therefrom strand-like material'having a desired uniform character comprising:
  • At least one pneumatic sensor means for monitoring a parameter of strand-like material passing therethrough;
  • At least one fluidic signal means having a first and a second output port, said fluidic signal means being connected to said sensor means for producing a first pneumatic output signal from said first output port indicating a variation beyond a first predetermined value in a first direction in said parameter of said strand-like material, a second output signal from said second output port indicating a variation beyond a second predetermined value in a second direction in said parameter of said strand-like material, and no output signal from either of said first and second output ports for variations between said-first and second predetermined values in said parameter of strand-like material;
  • pneumatic control means including first and second low to high pressure three way valves each of said valves having an input port and an output port, the first input port of said first valve being connected to said first output port said fluidic signal means for receiving therefrom said first output signal produced by said fluidic signal means, the first input port of said second valve being connected to said second output port of said fluidic signal means for receiving therefrom said second output signal produced by said fluidic signal means;
  • At least one pneumatic actuator means connected to the respective output ports of said first and second valves of said control means and operated by said control means in accord with the receipt by said control means of said first and second output signals from said fluidic signal means;
  • a closed loop fluidic control system as set forth in claim 1 further comprising:
  • filter supply and regulator means for filtering and regulating the pressure of the fluid supplied to said sensor means, said fluid signal means, said control means, and said actuator means;
  • hydraulic snubber means connected to said actuator means, said hydraulic snubber means including settable velocity rate control means for allowing adjustment in system response to achieve a stable system.
  • said fluidic signal means includes a first visual indicating means which is illuminated when said first pneumatic output signal'is produced;
  • said fluidic signal means includes a second visual indicating means which is illuminated when said second pneumatic output signal is produced.
  • At least one fluidic signal means connected to said sensor means for producing at least one pneumatic output signal indicating a variation in said parameter of the material
  • At least one pneumatic actuator means connected to said pneumatic control means and operated by said pneumatic control means in accord with the receipt by said pneumatic control means of said pneumatic output signal from said fluidic signal means, said actuator means including an enclosure and a member having one end thereof within said enclosure and another end thereof extending outwardly from said enclosure; and
  • said interconnecting means including a first lever having one of two ends connected to said other end of said member, a second lever connected to the second end of said first lever and having first and second ends, means for fixing the first end of said second lever, and an idler pulley connected to the second end of said second lever for coacting with said variable speed feed means whereby when the material is sensed to have varied from said parameter and pneumatic output signal is produced by said fluidic signal means and transmitted to said pneumatic control means to operate said member of said pneumatic actuator means to cause said idler pulley to effectuate a change in the speed of said variable speed feed means to restore the material to said uniform character.
  • said pneumatic output signal produced by said fluidic signal means is a digital signal
  • said pneumatic control means includes a first low to high pressure three-way valve and a second low to high pressure three-way valve, each of said first and second low to high pressure three-way valves having an output port connected to said pneumatic actuator means; and
  • said pneumatic actuator means includes an air cylinder.
  • filter supply and regulator means for filtering and regulating the pressure of the fluid supplied to said sensor means, said fluid signal means, said pneumatic control means and said pneumatic actuator means;
  • hydraulic snubber means connected to said pneumatic actuator means, said hydraulic snubber means including settable velocity rate control means for allowing adjustment in system response to achieve a stable system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Feedback Control In General (AREA)
US00218212A 1972-01-17 1972-01-17 Closed loop carding machine control Expired - Lifetime US3768122A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21821272A 1972-01-17 1972-01-17

Publications (1)

Publication Number Publication Date
US3768122A true US3768122A (en) 1973-10-30

Family

ID=22814197

Family Applications (1)

Application Number Title Priority Date Filing Date
US00218212A Expired - Lifetime US3768122A (en) 1972-01-17 1972-01-17 Closed loop carding machine control

Country Status (5)

Country Link
US (1) US3768122A (bg)
JP (1) JPS4877125A (bg)
DE (1) DE2301608A1 (bg)
FR (1) FR2168345B3 (bg)
GB (1) GB1377592A (bg)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5452626A (en) * 1993-03-12 1995-09-26 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for the automatic adjustment of rotational speed ratios between operating elements of a draw frame
US5463556A (en) * 1992-06-17 1995-10-31 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for control of an autoleveling draw frame
US5583781A (en) * 1991-06-04 1996-12-10 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device to correct the regulation onset point and the intensity of regulation
US5619773A (en) * 1993-01-25 1997-04-15 Rieter Ingolstadt Spinnereimaschinenbau Ag Draw frame

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3088175A (en) * 1958-01-10 1963-05-07 Aoki Akira Automatic level control system for product sliver weight
US3644964A (en) * 1968-09-03 1972-02-29 Carding Spec Canada Apparatus for controlling the variation of silver delivered from a carding machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3088175A (en) * 1958-01-10 1963-05-07 Aoki Akira Automatic level control system for product sliver weight
US3644964A (en) * 1968-09-03 1972-02-29 Carding Spec Canada Apparatus for controlling the variation of silver delivered from a carding machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5583781A (en) * 1991-06-04 1996-12-10 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device to correct the regulation onset point and the intensity of regulation
US5463556A (en) * 1992-06-17 1995-10-31 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for control of an autoleveling draw frame
US5619773A (en) * 1993-01-25 1997-04-15 Rieter Ingolstadt Spinnereimaschinenbau Ag Draw frame
US5452626A (en) * 1993-03-12 1995-09-26 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for the automatic adjustment of rotational speed ratios between operating elements of a draw frame

Also Published As

Publication number Publication date
DE2301608A1 (de) 1973-07-26
FR2168345A1 (bg) 1973-08-31
GB1377592A (en) 1974-12-18
FR2168345B3 (bg) 1976-01-16
JPS4877125A (bg) 1973-10-17

Similar Documents

Publication Publication Date Title
RU2066564C1 (ru) Система автоматического управления мукомольным 4- или 8-валковым станком и способ управления помолом в мукомольном 4- или 8-валковом станке
US2843882A (en) Evener
HU189976B (en) Method and apparatus for automatic controlling roller mill provided with grain feed regulation
US2710153A (en) Web tension control system
US4275483A (en) Control apparatus for a carding machine
US3768122A (en) Closed loop carding machine control
US3636149A (en) Crimping of yarn
US3938223A (en) Auto leveler
US3784123A (en) Tension control system
US5546993A (en) Web tension apparatus with sensor switch arrangement for oscilliating dancer roll and method
US2297812A (en) Draft control system
US4089232A (en) Variable speed drive system for carding machine
US3644964A (en) Apparatus for controlling the variation of silver delivered from a carding machine
US2922594A (en) Control apparatus for air-operated devices
US3057162A (en) Hydraulic power transmission apparatus
US3827106A (en) Apparatus for controlling the count of a sliver fed from a carding machine
GB928038A (en) Improvements in and relating to textile drafting apparatus
US2576936A (en) Hydraulically driven twisting apparatus
US6273314B1 (en) Process and apparatus for storage of fiber band between operating components of spinning machines
US3354711A (en) Continuous thread tension indicating drive roller
US2905976A (en) Drafting of textile fibres
GB1511764A (en) Method and apparatus for monitoring spun thread for defects in open-end rotor spinning machines
EP0289283B1 (en) Controlling carding machines
US4947665A (en) Apparatus for the electrical control of an in-line drawing machine
US655934A (en) Railway-head.