US3784129A - Alternate winding and unwinding of a two-ended program tape - Google Patents

Alternate winding and unwinding of a two-ended program tape Download PDF

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Publication number
US3784129A
US3784129A US00229542A US3784129DA US3784129A US 3784129 A US3784129 A US 3784129A US 00229542 A US00229542 A US 00229542A US 3784129D A US3784129D A US 3784129DA US 3784129 A US3784129 A US 3784129A
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US
United States
Prior art keywords
tape
driving
spools
spool
driving motor
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
US00229542A
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English (en)
Inventor
N Bourgeois
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.)
Etudes et Bonneterie SA
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Etudes et Bonneterie SA
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.)
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Application filed by Etudes et Bonneterie SA filed Critical Etudes et Bonneterie SA
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Publication of US3784129A publication Critical patent/US3784129A/en
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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/44—Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/48—Starting; Accelerating; Decelerating; Arrangements preventing malfunction during drive change
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/52—Controlling, regulating, or indicating speed by using signals recorded on, or derived from, record carrier
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S242/00—Winding, tensioning, or guiding
    • Y10S242/01—Tape programme control means

Definitions

  • ABSTRACT A two-ended program tape is alternately wound and unwound between two spools by a reversible motor, the spools being connected to this reversible motor via couplers and respective clutches so that the tapereceiving spool is also driven by the motor, and each spool also having a respective auxiliary motor.
  • the clutch of the receiving spool is disengaged and its auxiliary motor supplied to rotate in the opposite direction thereby forming a length of loose tape between this spool and the reversible motor.
  • a subsequent reading of a reversal data on the tape actuates reversal of the main motor and engagement of the clutch of the empty spool which is driven in the direction to wind tape thereon, supply to the auxiliary motor of the first spool being cut when the prereversal data passes back under the reader.
  • the invention relates to the alternate winding and unwinding of two-ended program tapes carrying data for the control of machines, driven by means of a reversible motor in front of means for reading data on the tape.
  • a solution which enables a partial resolution of this problem consists in permanently providing, between each spool and the driving motor, a loop of loose tape of sufficient dimensions to form a reserve enabling the jerks which are inevitably produced during reversal to be supported.
  • the variations in the length of these loops can be usefully employed to servo-control the speed of rotation of the spools, but such an arrangement requires the use of complex and delicate means, notably for ensuring guiding of the loops of tape which may attain appreciable lengths in the case of high speed tapes.
  • a process for controlling the alternate winding and unwinding of a two-ended program tape between a pair of spools comprises selectively disposing auxiliary reversal data and pre-reversal data on the tape, alternately driving the tape by means of a reversible driving motor from one spool to the other past means for reading data on the tape, temporarily braking and reversing the direction of rotation of the tape receiving spool under the control of a pre-reversal data to form a length of loose tape between said receiving spool and the driving motor, and subsequently reversing the direction of rotation of the driving motor under contorl of a reversal data.
  • FIGS. 1 and 2 are respectively front and rear elevational views of this device
  • FIG. 3 is a profile cross-section taken along the broken line xxyy of FIG. 1;
  • FIG. 4 schematically shows a disposition of data on a program tape.
  • the device shown serves for the alternate winding and unwinding of a two-ended program tape 1 carrying data intended for the selection of knitting elements of a circular knitting machine.
  • the program tape 1 is driven by its lateral edges by means of two control flanges 2 and 4, mounted at the end of the shaft of a reversible motor 3, and guided by two pressure rollers 5 and 6.
  • This driving assembly is disposed on the path of the tape 1 between two spools 7 and 8, between which the tape 1 is alternately wound and unwound from one end to the other, and a liason is set up between these three members-b a driving chain 9 passing about three toothed chainwheels 10, l1 and 12.
  • the ratio between the number of teeth of the driving wheel 10 and that of the two driven wheels 11 and 12 is such that the maximum speed of rotation of each spool 7, 8 is slightly greater than the speed required for winding the tape 1, at a given constant speed, onto the smallest available diameter of the spools.
  • a multitrack optical reader 13 located under the path of the tape 1 about the flanges 4, detects the passage of the data on the tape 1 by transparency, the tape being illuminated by means of a light conduit 14.
  • the various elements forming the device are carried by an upright support plate 15,-fixed to a stationary part of the knitting machine by means not shown.
  • the two flanges 2 and 4 controlling drive of the tape 1.
  • the other end of shaft 16 is connected to the inner mass of a driving coupler 18 of the permanent magnet type and providing a torque much less than that transmitted by the motor 3.
  • the chainwheel l0 controlling the chain 9 for driving the spools 7 and 8.
  • An important function of the coupler 18 is to servocontrol the speed of rotation of the receiving spool to the substantially constant speed of motion of the tape 1, in a manner such that the tape being wound onto this spool is neither too tight nor too loose.
  • a second coupler 19 is disposed in axial alignment with the first coupler 18.
  • the inner mass of the second coupler is connected by a sleeve 21 to the inner mass of the first coupler and consequently to the shaft of motor 3, whilst its outer mass is fixed to a support plate 22 connected to the plate 15.
  • This second coupler provides a slightly greater torque than the first coupler and is intended to brake any unwanted racing which may be produced during the short periods when the feed of the motor 3 may be cut off, particularly in the case where the speed of the latter is servo-controlled to the number of data counted at the input and the output of a memory.
  • Each spool is mounted at the end ofa shaft of a respective d.c. motor 23 whose stator is fixed onto the support plate 15.
  • the other end of each of the shafts carries a sliding armature 24 of an electromagnetic clutch 25, the torque of which is greater than that of the first coupler 18.
  • An axially fixed armature 26 of clutch 25 is mounted on a shaft 27, angularly fixed to the corresponding chainwheel 11 or 12.
  • the program tape shown in FIG. 4 has a series of Iongitudinal data tracks, schematically shown by lines 30, and intended for the selective control of the knitting elements.
  • Two auxiliary tracks 31, 32 are disposed on opposite sides of the tracks 30.
  • the track 31 comprises, at each end, a so-called reversal data 33 and 34 respectively which, by means of the optical reader 13, has the function of controlling the reversal of the direction of rotation of the driving motor 3.
  • the track 32 comprises, at each end, a so-called pre-reversal data, 35 and 36 respectively, which begins slightly upstream of the corresponding reversal data 33, 34 and extends until it faces the latter.
  • These two elements of prereversal data are intended, always by means of the reader 13, for the control of the respective motors 23 and electromagnetic clutches 25 of the winding spools 7 and 8.
  • the described device operates as follows:
  • the signal produced is used to cut off excitation of the: electro' magnetic clutch 25 associated with the spool 7. Simultaneously, the same signal actuates feed of the motor 23 also associated with the spool 7, in a manner to control its rotation in the direction of the arrows B, that is opposite to the direction of winding of the film.
  • the spool 7 which is no longer driven by the motor 3 continues to turn for a certain time because of its inertia, driving with it the shaft of the motor 23 which is being fed for a rotation in the opposite direction.
  • the signal received is used on the one hand to control the practically instantaneous reversal of the direction of rotation of the driving motor 3 and, on the other hand, to cause excitation of the electromagnetic clutch 25 associated with the spool 8 which, through the driving of the chainwheel 12, in turn becomes the: tape receiving spool.
  • the driving coupler 18 carries out a second important function. Because of the inertia of the spool 8, this spool will not be instantaneously reversed. There is a resultant formation of a loop or length 39 of loose tape between the spool 8 and the driving motor 3, which loop will be taken up without jerking under the action of the coupler 18 as soon as the spool 8 begins turning in the direction of the arrows B.
  • the driving motor 3 which drives the tape 1 in the direction of the arrows B, begins to take up the initially formed loop 38, whilst the motor 23 of spool 7 which is still temporarily fed, turns in the correct direction of rotation, driving with it the spool 7 which becomes the tape output spool.
  • the beginning 37 of the pre-reversal data 36 triggers cutting off of the supply to the motor 23 of spool 7, without however excitation of the corresponding electromagnetic clutch 25 being re-established, this clutch remaining in its inoperative state until reading of the reversed data 33 during the next reversal operation.
  • the angular speed of the spool 7 (or 8 as appropriate) to correspond closely to the linear speed of driving of the tape 1.
  • This correspondence can be obtained by selecting, on the one hand, during the disposition of the'data on the tape, the distance T separating the beginning of the pre-reversal data from the corresponding reversal data as a function of the total length and more precisely the mass of the program tape wound on the receiving spool at the moment of reversal and, on the other hand, servo-controlling the value of the voltage supplied to the motors 23 to the speed of the tape.
  • this servocontrolling can result from the frequency of reading the data of a part of one of the longitudinal tracks of the tape during the period of supplying the motor.
  • the same cycle of operations will reoccur at the next reversal of the motor 3, where this time it is the motor 23 associated with the spool 8 which once more becomes the tape output spool and is supplied to turn in the direction of the arrow A, under the temporary/control of the pre-reversal data 35.
  • the output spool is not driven by its motor 23 but rotates solely under the traction of the tape 1.
  • a sudden reduction of the speed of the driving motor 3, or a sudden stopping of the machine, whether controlled by the operator or by the automatic actuation of various safety devices following certain occurences in the knitting, for example, would risk causing the formation of a loop or length of loose tape the taking up of which would inevitably cause a jerk at the moment of coming back to a normal rate of operation.
  • a pair of spools mounted to have alternately wound and unwound therefrom said tape
  • reading means positioned in the path of said tape between said spools for reading said data On said tape;
  • a reversible driving motor mounted for alternately driving said tape past said reading means from one of said spools to the other;
  • auxilary motors mounted for selectively driving one of said spools; means interconnected between said reading means and said auxiliary motors, and actuable upon reading of said pre-reversal data by said reading means, for temporarily controlling the one of said auxiliary motors operating the tapereceiving of said spools to brake said tape-receiving spool and to reverse the direction of rotation thereof, and thus for forming a length of loose tape between said tapereceiving spool and said driving motor; and
  • a device as claimed in claim 2 further comprising a driving coupler operatively positioned between said driving motor and said means for driving said spools.
  • a device as claimed in claim 4 further comprising a braking coupler operatively associated with said driving motor and disposed coaxially to said driving coupler, said braking coupler producing a greater torque than said driving coupler.
  • auxiliary motors are do. motors which, when not supplied with current, are generator means for producing a braking torque acting on the corresponding spool.
  • a process for controlling the alternate Winding and unwinding of a two-ended program tape between a pair of spools comprising:

Landscapes

  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Replacement Of Web Rolls (AREA)
US00229542A 1971-03-05 1972-02-25 Alternate winding and unwinding of a two-ended program tape Expired - Lifetime US3784129A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH324571A CH534937A (fr) 1971-03-05 1971-03-05 Procédé et dispositif de commande de l'enroulement et du déroulement alternés d'un ruban-programme à deux extrémités

Publications (1)

Publication Number Publication Date
US3784129A true US3784129A (en) 1974-01-08

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US00229542A Expired - Lifetime US3784129A (en) 1971-03-05 1972-02-25 Alternate winding and unwinding of a two-ended program tape

Country Status (6)

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US (1) US3784129A (it)
CH (1) CH534937A (it)
DE (1) DE2210402B2 (it)
FR (1) FR2127584A5 (it)
GB (1) GB1372970A (it)
IT (1) IT957516B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883893A (en) * 1973-03-09 1975-05-13 Pioneer Electronic Corp Magnetic tape recording and reproducing apparatus
EP0525883A3 (en) * 1991-07-31 1993-08-25 Koninkl Philips Electronics Nv Prerecorded record carrier

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535486A (en) * 1946-08-16 1950-12-26 Brush Dev Co Magnetic record transducing apparatus having a backing element for coupling a recordtape to the magnetic head
US2927258A (en) * 1951-07-27 1960-03-01 Lippel Bernard System for controlling automatic machine tools
US2971716A (en) * 1959-05-25 1961-02-14 Sidney O Sampson Automatic tape cartridge for magnetic recorders

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535486A (en) * 1946-08-16 1950-12-26 Brush Dev Co Magnetic record transducing apparatus having a backing element for coupling a recordtape to the magnetic head
US2927258A (en) * 1951-07-27 1960-03-01 Lippel Bernard System for controlling automatic machine tools
US2971716A (en) * 1959-05-25 1961-02-14 Sidney O Sampson Automatic tape cartridge for magnetic recorders

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883893A (en) * 1973-03-09 1975-05-13 Pioneer Electronic Corp Magnetic tape recording and reproducing apparatus
EP0525883A3 (en) * 1991-07-31 1993-08-25 Koninkl Philips Electronics Nv Prerecorded record carrier

Also Published As

Publication number Publication date
DE2210402A1 (de) 1972-09-21
GB1372970A (en) 1974-11-06
DE2210402B2 (de) 1974-06-20
IT957516B (it) 1973-10-20
CH534937A (fr) 1973-03-15
FR2127584A5 (it) 1972-10-13

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