US3797279A - Thread-feeding, tension-regulating device for straight knitting machines - Google Patents

Thread-feeding, tension-regulating device for straight knitting machines Download PDF

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Publication number
US3797279A
US3797279A US00256691A US3797279DA US3797279A US 3797279 A US3797279 A US 3797279A US 00256691 A US00256691 A US 00256691A US 3797279D A US3797279D A US 3797279DA US 3797279 A US3797279 A US 3797279A
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tension
supplemental
thread
regulating device
arm
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US00256691A
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English (en)
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L Kline
F Silberman
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Individual
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles

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  • ABSTRACT Thread-feeding, tension-regulating device for straight knitting machines comprising a tensioning arm having a threading member at its free end, supplementing those of the associated machine, with resilient means tending to lift the free end of the supplemental arm, and a device for multiplying the displacements, interposed between a movable application point of the resilient means and that of the pressure exerted on the body of the supplemental arm.
  • the latter performs a substantial angular displacement despite of a very small displacement of the movable application point, the pressure of the resilient means thus remaining virtually uniform along the path of the angular displace ment.
  • the inventive device can take various constructional forms.
  • the invention relates to a thread-feeding, tensionregulating device that may be applied to generally all knitting machines, for taking up unnecessary slack in the dispensed thread and maintaining the required uniform thread tension.
  • Tensioning devices which have been used so far with industrial as well as home-use knitting machines-are only able to take up a very small excess of thread in comparison to the distance traveled by the carriage, as related to the edge of the produced fabric.
  • the excess of thread taken up by the known devices amounts to but a few centimeters; therefore, a special device becomes necessary for industrial power-driven knitting machines, designed to limit the travel either of the carriage or, if applicable, of the thread holders to a few centimeters in excess of the edge of the fabric.
  • the special device has to be ad-.
  • the tensioning appliance must make sure that thread feeding occurs at the very moment the machine operation requires the thread to be fed; however the carriage should not cause an excess output of knit ting thread during its return travel with regard to the fabric edge, namely in excess of the output which the tensioning device is able to pick up, in order to prevent tension reduction and thread slackening during the subsequent carriage travel.
  • Some power-driving systems for home-use knitting machines have recently been created which consist basically in an endless chain or belt designed to drive the carriage, the belt being driven by a reversible motor.
  • the carriage travel is regulated by means of adjustable reversing stops acted upon by the carriage, thus producing at each travel end a reversal of the motor drive.
  • the inventive thread-feeding, tensionregulating device was created which is able to take up the thread dispensed in excess when the carriage travels in an idle run over the whole length of the machine, but supplying a virtually uniform feeding tension.
  • the new thread-feeding, tension-regulating device is essentially constituted by a supplemental tensioning arm mounted in an articulated manner by one of its ends, whereas the opposite, free end includes a supplemental threading member.
  • the tensioning arm consists normally of a light and relatively elastic bar which is submitted to the action of resilient means which tend to lift the free end of the tensioning arm.
  • the invention is mainly characterized in that a device, designed to multiply the respective displacements,
  • this new thread-feeding, tension-regulating device may be built in several ways. It is adapted however in all cases to the essential characteristics of the invention as defined above.
  • one of the preferred exemplary embodiments of the invention consists in that the articulated end of the supplemental tensioning arm is united with the shaft of a small gear connected to a toothed rack or segment, formed as a circular bow of a substantially longer radius than that of the small gear, the shaft of the gear being mounted rotatably on the end of at least one guide rod, the opposite end of which is mounted in an articulated manner, coinciding with the geometrical center of the circular bow.
  • the guide rod or rods are submitted to the action of biasing means which tend to cause the guide rod or rods to rotate about the articulated mounting.
  • the supplemental tensioning arm is united with a rotatably mounted small gear, and a multiplication gear train is interposed bearm is designed to consist of a firstor second-degree lever the power arm of which has to be substantially shorter than the other arm.
  • the multiplication of the device may evenbe increased by means of two serially connected levers in such a way that the multiplication effect of the first lever will in turn be further multiplied by the second lever.
  • the invention consists in interposing a device designed to multiply displacements between the movable application point of the resilient means and the application point of the pressure exerted on the body of the supplemental tensioning arm, in such a way that the latter performs a noticeable angular displacement, resulting from a very small displacement performed by the movable application point of the resilient means, designed to cause the pressure exerted by the latter along the angular displacement of the supplemental tensioning arm to remain virtually uniform.
  • FIG. 1 is a side view of one of the preferred, exemplary forms of the inventive thread-feeding, tensionregulating device, with a supplemental tensioning arm in the upper end position;
  • FIG. 2 is likewise a side view of the same device but with its arm in the lower end position;
  • FIG. 3 is an elevation of the device of FIGS. 1 and 2;
  • FIG. 4 shows a front perspective of the same device
  • FIG. 5 shows an overall perspective view of the inventive exemplary device of FIGS. 1 to 4 when applied to a home-use knitting machine which is mounted on a support bench and equipped with a power drive;
  • FIG. 6 is a partial side view of the arrangement in FIG. 5, with different operational phases being illustrated;
  • FIG. 6a shows an enlarged portion of FIG. 6, partly in section
  • FIG. 7 shows a portion of the machine-carriage driving device of FIG. 5;
  • FIG. 8 is a wiring diagram of a preferred electrical circuit designed to drive the electric motor of the machine.
  • FIG. 9 shows a partial side view of another exemplary form of the inventive tension-regulating device, with a multiplication gear train.
  • FIG. 10 shows a partial side view of yet another embodiment of the tension-regulating device, this time based on a first-degree lever designed to multiply the displacement.
  • FIGS. 1 through 4 The revolutionary principle underlying the present invention will be illustrated in three practical exemplary embodiments, namely in FIGS. 1 through 4, and also shown in FIGS. 5 and 6 on a home-type knitting machine, generally identified by numeral 15; then in a modified or second. form, denoted generally by numeral 15A, in FIG. 9; and finally in yet another structural example, identified by numeral 15B and illustrated in FIG. 10.
  • the three examples clearly show that the inventive concept has a wide area of applicability and is suitable for practically all knitting machines of the general type described hereinabove.
  • the thread-feeding, tension-regulating device 15, as shown in FIGS. 1 through 7, basically consists of a vertical support structure 1 united with a carriage 2 (see FIGS. 5, 6, 7) of a knitting machine 3, such as any one fixed which latter engages rack 6.
  • machine 3 FIGS. 5 and 6 has a conventional tensioning arm 46 with a threading member 46a formed at the free end of the former.
  • the inventive tension-regulating device on one end 12' of shaft 12 the end 14 of a bar 16 is fixed, made of a light and elastic material, which constitutes a supplemental threadtensioning arm, with its free end formed as a supplemental threading member 16a, cooperating with the respective parts 46, 46a of the machines
  • parts 6 through 13, 16, 16a and the correlated structural elements constitute, in the described exemplary embodiment 15 of the inventive device, a multiplying device or means which is the essential part of the invention.
  • a helicoidal spring 17 mounted on one end of shaft 8 has an angular bend 19 on one end 18, bearing against an area 10 of one of the guide rods 10, while the opposite end 20 of spring 17 bears against an adjusting screw 21 which can be inserted and turned into any one of threaded boreholes 22 provided in part5 (in the area of toothed rack 6), allowing to adjust the tension of spring 17.
  • the newthread-feeding, tension-regulating device 15 of FIGS. 1 through 4 is arranged in the following way for its application to a common home-use knitting machine, as will be explained with reference to FIGS. 5 through 7.
  • Knitting machine 3 is fixedon a support bench 23 having a power drive.
  • the bench incorporates an electric motor 24; by means of an interposed doublereduction pulley 27, 28 the motor transmits'by way of belts 25, 26 a rotary movement to a pulley 29 fixed on a shaft 30 which is journaled on one end of bench 23.
  • a fixed pinion 31 mounted on shaft 30 engages another pinion 32, rotatably mounted on a shaft 33, fixed on the other end of bench 23.
  • the pinions actuate, as bearing and driving elements, an endless chain 34.
  • One of the articulation bolts of chain 34 is formed as a side projection 35 (see FIG. 7) adapted to catch in a slot 36 of a depending part 37.
  • the latter is fixed to a channel iron 38 sliding along a guiding bar 39 fixed to bench 23.
  • This channel iron 38 is connected by means of a fishplate 40 with carriage 2 of machine 3; the lower end 1' of vertical support structure 1 is fixed on chan-' nel iron 38, as previously described.
  • a clew holder 41 is mounted on carriage 2 and it holds a clew or ball of thread 42 in a conventional manner.
  • a thread 43 runs from clew 42,passing through a brake formed by a spring 44 which latter presses thread 43 against a fixed surface 45.
  • the machine includes in the present case the earliermentioned regular tensioning arm 46 with the conventional threading element 46a on its outer or free end.
  • the body of arm 46 is continued as a helicoidal spring 48 (see FIG. 6a) serving as an articulated mounting for the arm and having an appendix 49 on its opposite or inner end, which bears against spring 44.
  • Thread 43 when winding off clew 42 passes through the brake formed by spring 44 and over surface 45, passing subsequently through threading member 46a of arm 46 of the machine, and thereafter through supplemental threading member 16a of the inventive tensioning arm 16; then, after having passed through a thread holder 46b of carriage 2, the thread passes towards the needles of the knitting machine 3.
  • the new regulating device operates in the following manner when applied to the common knitting machine as shown in FIGS. 5 through 7.
  • chain 34 starts its continuous displacement (later we shall see that the displacement may also be partial) in such a way that side projection 35, while travelling along the upper track ofendless chain 34, will displace parts 37, 38 and the other elements connected therewith, such as carriage 2, support structure 1, etc., towards one of the ends of the machine, whereas a displacement in the reverse direction will take place when side projection 35 travels along the lower track of chain 34.
  • side projection 35 slides either up or down within slot 36, as it passes about one of the pinions 31, 32, and thus from one lengthwise track to the other.
  • the supplemental tensioning arm 16 of the new thread-feeding, tension-regulating device which in the present exemplary case does not perform any function at all correspondingly remainsall the time prac tically in its lower angular displacement position (solid line in FIG. 6), coinciding with the releasing position of the brake of original arm 46 of the machine.
  • the supplern'ental arm 16 thus rises, together with arm 46, but
  • EXTREME CASE II The machine shall knit a fabric of but 5 centimeters in width, performing the knitting at one end of the machine. Let us assume that the carriage starts traveling from the end of the machine where the fabric has been arranged and that both the original and the new tensioning arms 46, 16 start from their upper, angular positions.
  • the inventive device shown in FIGS. 5 through 7 may be applied to knitting machines without the need of any changes thereof. Particularly clew holder 41, original tensioning arm 46 and braking device 44, 45 remain unchanged on the machine.
  • the new thread-feeding, tension-regulating device may of course be built with its own clew holder and brake, whichlatter may be of the type as shown and described before or of any other known type, and in such an event the original clew holder, brake and tensioning arm of the knitting machine are to be dispensed with.
  • FIG. 8 The wiring diagram of FIG. 8 has been included merely to show that the power drive of a home-use knitting machine can be provided in accordance with means already known, and for the purpose of the present invention, either by way of a continuous drive, such as would be desirable when a fabric of an unchanged width and pattern are knit, or by way of a discontinuous. drive, such as would be required when changes are to be made between carriage travels, e.g., for increasing or reducing the fabric width, for open-work fabrics, ornamental designs, etc.
  • a mains supply 51 for alternating current where a master switch 52 regulates the supply for an electric motor 53 fitted with a brake 54.
  • Numeral 55 denotes a series-connected pedal switch, 56 a hand-actuated switch; 57 is a relay with an armature 58; 59a, 59b are limit switches actuated for example by the machine carriage at the endof each travel marked by respective arrows 2a,.2b.
  • FIG. 9 shows thatin the modified device A supplemental tensioning arm 16 has one end 14 fixed to small gear 13 rotatably mounted on shaft 12 which is mounted. on a base plate 4".
  • Helicoidal spring 17 is mounted on a pin 8' fixed onto base plate 4" and has its end 18 form the'bend 19, moving within a slot 63 of a disk 64 provided with a toothed segment 65 and rotatably mounted on a fixed shaft 66.
  • Opposite end 20 of spring 17 bears against adjusting screw 21 adapted to be partially screwed into any one of bores 22 on base plate 4".
  • the new device may also be used with industrial knitting machines in which case the special travel-limiting device for the carriage on the thread holder, designed to be adapted to the width of the fabric, may be completely dispensed with. This entails not only a signifi cant economy but also an important simplification in the handling and maintenance of the knitting machines.
  • a thread-feeding, tension regulating device for straight knitting machines (3) which latter include a reciprocable carriage (2), a thread-tensioning arm (46) and a threading member (46a) at the free end of the latter, the tension-regulating device comprising a supplemental thread-tensioning arm (16) having a body andbeing articulated by one end (14) while the other, free end has a supplemental threading member (16a) thereon, resilient means (17) for biasing said supplemental tensioning arm, said resilient means tending to lift said free end of the supplemental tensioning arm and having a movable application point (10', 19), and means (6 to 13; 63 to 69; 70 to 76) interposed between said movable application point of the resilient means and an application point (13; 63; 75) of its pressure on said body of the supplemental tensioning arm, for mul plemental tensioning arm performs a noticeable angular displacement as a result of a very small displacement performed by said movable application point, in order that said pressure exerted by the resilient means remains
  • said regulating means (20 to 22) includes a member (21) associated with one end (20) of said resilient means (17), adapted to be engaged in one of a plurality of holes (22) provided in a stationary member (5).
  • the knitting machine (3) further includes a clew holder (41), a braking device (44, 45)'and another threading member (46b) on said carriage (2), for the thread (43) to be knit, the tension-regulating device further comprising means for guiding the thread along a path from said clew holder to said other threading member by way of said braking device and said supplemental threading member (16a).
  • said guiding means further includes in said path of the thread (43) said first-named threading member (46a) of the knitting machine (3) between said braking device (44, 45) and said supplemental threading member (16a).
  • said multiplying means (70 to 76) further includes an articulated (72) lever (71) having respective power (70) and resistance arms (74), said power arm being substantially shorter than said resistance arm, the latter acting on said supplemental tensioning arm (16).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US00256691A 1971-05-26 1972-05-25 Thread-feeding, tension-regulating device for straight knitting machines Expired - Lifetime US3797279A (en)

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US (1) US3797279A (cs)
JP (1) JPS4912155A (cs)
BR (1) BR7203099D0 (cs)
DE (1) DE2226451A1 (cs)
ES (1) ES403217A1 (cs)
FR (1) FR2139165B1 (cs)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196601A (en) * 1977-01-17 1980-04-08 Sulzer Morat Gmbh Endless track rotating thread guide
US4672824A (en) * 1984-12-06 1987-06-16 Curry Roger F N Flat bed knitting machines
US20230053628A1 (en) * 2021-08-18 2023-02-23 Texas A&M University Corpus Christi Yarn Tensioning Device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US94135A (en) * 1869-08-24 Improvement in knitting-machine
US109793A (en) * 1870-12-06 Improvement in knitting-machines and needles
US2791109A (en) * 1953-05-22 1957-05-07 Willy Werner Lenkeit Device for stretching the thread in hand-operated knitting machines
US2981497A (en) * 1956-09-17 1961-04-25 Steinhof Apparatefab Karl Thread tensioner

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US94135A (en) * 1869-08-24 Improvement in knitting-machine
US109793A (en) * 1870-12-06 Improvement in knitting-machines and needles
US2791109A (en) * 1953-05-22 1957-05-07 Willy Werner Lenkeit Device for stretching the thread in hand-operated knitting machines
US2981497A (en) * 1956-09-17 1961-04-25 Steinhof Apparatefab Karl Thread tensioner

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196601A (en) * 1977-01-17 1980-04-08 Sulzer Morat Gmbh Endless track rotating thread guide
US4672824A (en) * 1984-12-06 1987-06-16 Curry Roger F N Flat bed knitting machines
US20230053628A1 (en) * 2021-08-18 2023-02-23 Texas A&M University Corpus Christi Yarn Tensioning Device
US12037725B2 (en) * 2021-08-18 2024-07-16 Texas A&M University Corpus Christi Yarn tensioning device

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FR2139165A1 (cs) 1973-01-05
FR2139165B1 (cs) 1973-07-13
JPS4912155A (cs) 1974-02-02
ES403217A1 (es) 1976-01-01
DE2226451A1 (de) 1972-12-07
BR7203099D0 (pt) 1973-06-07

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