Classifications

• • 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
  • D04B15/32—Cam systems or assemblies for operating knitting instruments
  • D04B15/34—Cam systems or assemblies for operating knitting instruments for dials
• • 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
  • D04B15/32—Cam systems or assemblies for operating knitting instruments
  • D04B15/322—Cam systems or assemblies for operating knitting instruments in circular knitting machines with needle cylinder and dial
• • 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
  • D04B15/32—Cam systems or assemblies for operating knitting instruments
  • D04B15/327—Cam systems or assemblies for operating knitting instruments for stitch-length regulation
• • 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
  • D04B15/54—Thread guides
  • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices

Definitions

• the invention relates to a circular jersey knitting machine for production of plush fabric consisting of at least one knitting system with radially movable sinkers fitted with a belly for lapping the ground thread and a nib for lapping a plush thread, while these sinkers are controlled by cams with radially immovable needle cams and/or their sections and radially movable tensioner of plush loops for tensioning the plush loops by a radial movement towards the centre of the machine and the sinkers' nib while drawing-out the sinker towards the centre of the machine plugs into previously formed plush loops, whereas the machine further consists of knitting means, which are arranged in a cylinder and they are controlled by a cylinder cam system with a lifting and drawing-down part of a cam channel.
• US Patents 4.194.374 and 4.346.572 According to this principle is the plush fabric produced using needles positioned in a needle cylinder and using sinkers positioned in radial grooves on sinkers' beds.
• the threads are fed in the position where the sinkers are drawn-down to the limit in the direction out from the centre of the machine, while consequently is the plush thread lapped on the sinker nib and the ground thread is lapped on the sinker belly, fitted with a slant ramp for creeping the ground thread into the needle hook.
• the sinker from this starting position draws-out of the bed radially towards the machine axis into the position for sinking and in the position, where the slant ramp for creeping the ground thread is under the needle hook, proceeds the sinking.
• a tensioner of plush loops which in its part is a movable needle cam, which during machine adjustment rotates using an adjusting cam around a pin positioned in a needle cam, while this movable needle cam acts on the back sinkers' butt and draws-out the sinkers for tensioning the plush loops.
• the tensioner is fitted with two lugs, the first one for tensioning over the hook or the breast and the second for tensioning over the needle shank.
• the tensioning part of the movable cam is followed by a following fixed cam, which draws-down the sinker by the back butt into the starting position of inmost sinking and the cycle goes on. Synchronously with the movement of sinkers is controlled the movement of the needles by the cam system.
• the fixed part of the cam lifts the needle to the tensioning position, in this position is in the guide situated an opening for feeding the plush thread, while the needle is from the maximal lifted position being drawn-down only gradually so that the needle latch is covered with the thread guide and does not happen its accidental tensioning and so that the plush thread can get under the needle hook.
• the needle steeply drawn-down to the position for tucking the thread by the needle hook, it is lifted to the tucking position by a short pointed arc, where its vertical movement stops and the needle leaves the fixed part of the cam in a horizontal direction. Nevertheless while steep drawing- down the needle for tucking the plush thread there are inertia forces that tend to close the needle latch.
• the number of knitting systems on the machine is further limited by arrangement of the guide and that is in particular due to the position of the opening for feeding the plush thread, which requires use of a longer fixed part of the cam and shortens the space available to the draw-down cam, which is then necessary to be constructed steep and without gradual transitions. Due to the smaller number of the systems is also limited the machine productivity.
• Another disadvantage of this embodiment is that in cylinder system occur dynamic impacts while impact of the butts against the steep central cam and also the draw-down cam and all of that with all negative consequences consisting in particular in lowering the operating speed and further decrease of machine productivity.
• the goal of the invention intends to eliminate or at least to minimize the drawbacks of the art.
• the sinkers controlled by the cams have in the area directly in front of the tensioner of plush loops movement trajectory, which intersects with the movement trajectory of the sinkers controlled by the front end of the tensioner of plush loops.
• the trajectory of the sinkers controlled by the back end of the tensioner of plush loops in the area directly before the following part of the needle cam immovable in radial direction intersects with the movement trajectory of sinkers controlled by this following part of the needle cam immovable in radial direction and the control of the sinkers by the tensioner of plush loops passes directly to the control of the sinkers by a cam controlling drawing-down the sinkers.
• the part of the needle cam immovable in radial direction drawing-out the sinkers before the tensioner of plush loops affects the back edge of front sinkers' butt and the front end of the directly following the tensioner of plush loops affects the back edge of back sinkers' butt
• the part of the needle cam , immovable in radial direction drawing-out the sinkers before the tensioner of plush loops and directly following the front end of the tensioner of plush loops mutually concur in a point, where at the same time the front sinkers' butt contacts the needle cam immovable in radial direction and the back sinkers' butt contacts with the front end of the tensioner of plush loops.
• the back end of the tensioner of plush loops affects the front edge of the back sinkers' butt and in the direction parallel to the machine axis overlaps with the following part of the needle cam immovable in radial direction, which also affects the front edge of the front sinkers' butt, while the back end of the tensioner of plush loops and the following part of the needle cam immovable in radial direction concur in a point where the front sinkers' butt contacts at the same time the back end of the tensioner of plush loops and the following part of the needle cam immovable in radial direction.
• the cylinder cam system consists of a needle cam with a lifting part of a cam channel, which is positioned behind the point of maximal lift of the needles in the cam channel fitted with a part drawing-down the needles, while the steepness of this part is higher than the steepness of the following parts in this needle cam and the back end on this needle cam has in principle horizontal direction and transition between these two parts of the cam channel is formed by a part in the shape of an arc with constant or variable curvature, which is in predominant part more gradual than the curvature of the cam channel in the part comprising the point of highest lift of the needles.
• the back end of the needle cam with the lifting part of the cam channel is followed by the front end of the needle cam with the drawing-down part of the cam channel, while the needle cam with the drawing-down part of the cam channel is in the machine movement direction behind the point of inmost sinking of the needles fitted with the back end for lifting the needles, which has basically the same or lower grade than the front end of the cam channel of next following needle cam with the lifting part of the cam channel has.
• the point of the cylinder cam channel where the needles start to lift behind the inmost sinking corresponds to the basic configuration of the beginning of drawing-out the sinkers after sinking the thread on the part of the needle cam immovable in radial direction of the cam system controlling the sinkers.
• the guides comprise a lapping part, in which is before the opening for feeding the ground thread situated an inclined opening for feeding the plush thread coming out in the side of the needles lower than is the needle hook point in the tuck position and higher than is the upper edge of the sinker nib.
• a lug for guiding the elastan fiber into the knitting means is advantageously composed of a pin situated in the opening on the outer side of the guide or of a nose situated on the outer side of the guide ad equipped with a groove for guiding the elastan fiber. It is also advantageous if the beginning of the cam channel arc stopping drawing-down the needles before discharge from the central cam is situated before the beginning of an entering edge of the guide part of the thread guide and the end of the cam channel arc stopping drawing-down the needles before discharge from the central cam is situated behind the beginning.
• the principle of the adaptation of the principle of central control of the sinking on the above mentioned invention consists in that the cylinder cam system consists of the needle cams supported by the needle cams, which are firmly connected with the cylinder needle cam support, whose position can be adjusted in the machine axis direction using means for sinking depth adjustment, while each needle cam, consisting of the lifting part of the cam channel is positioned on the member, which is in the needle cam arranged movably in the machine axis direction, while it is connected with the cylinder needle cams support or cams of sinkers' cam system and this is reached either directly or by connecting means for maintaining basically constant mutual position.
• in connecting means are arranged means for limiting the transmitted force, which are according to one preferred embodiment fitted with means for limiting the transmitted force are fitted with the arm pressed down on one of its ends by a flexible member onto the bearing surface arranged on the support of cams or needle cams of the sinkers' knitting cam system, while the second end of the arm is connected with the member carrying the lifting part of the cam channel of the cylinder cam system.
• Fig. 1 is a vertical section of a sinker and a cylinder bed in the place of needle cams of a cylinder cam system consisting of sinking part of cam channel in the starting position, in the point of maximal draw-down the sinkers
• Fig. 2 is a vertical section of the sinker and the cylinder bed in the place of needle cams of a cylinder cam system consisting of a lifting part of the cam channel in the point of maximal draw-out the sinkers while tensioning a plush loop
• Fig. 1 is a vertical section of a sinker and a cylinder bed in the place of needle cams of a cylinder cam system consisting of sinking part of cam channel in the starting position, in the point of maximal draw-down the sinkers
• Fig. 2 is a vertical section of the sinker and the cylinder bed in the place of needle cams of a cylinder cam system consisting of a lifting part of the cam channel in the point of maximal draw-out the sinkers while tensioning a plush loop
• Fig. 1
• FIG. 3 is an arrangement of sinker cam system, while on the left side is shown the cam system with maximally drawn-out the tensioner of plush loops and on the right side with the tensioner in minimally drawn-out position
• Fig. 4 is a position development of a needle butt in the cylinder cam system and corresponding positions of needle heads during knitting
• Fig. 5 is a mutual arrangement of sinkers, needles and a thread guide during knitting in the view from inner side of the machine
• Fig. 6 is a mutual arrangement of the sinkers, the needles and the thread guide during knitting in the view from outer side of the machine
• Fig 7a thread guide embodiment with lug created as a nose with groove and Fig 7b a view in direction A from Fig 7a.
• a single bed circular jersey knitting machine which consists of a cylinder bed 2 support i, which is in a not represented appropriate manner rotatably and coaxially with the machine axis mounted on a machine frame.
• a cylinder bed 2 support On the cylinder bed 2 support is in an appropriate manner arranged a cylinder bed 2, on which is arranged a sinkers' 8 bed 3.
• the cylinder bed 2 is surrounded by a coaxially arranged cylinder needle cam support 4, where on the cylinder needle cams are mounted movable and immovable cams 5 or needle cams 52, 51, which while turning the cylinder bed 2 affect needle 6 butts 61 and thus control the movement of the needles 6 in the direction parallel with the machine axis.
• the sinker needle cams 9 controlling the sinkers 8 consist of radially immovable cams and/or needle cams 91 firmly connected by for instance screws with sinkers' 8 needle cams 7 and/or sinkers' needle cam 9 support 10 or needle cams 7 and from radially movable tensioners 92 of plush loops.
• the needle cam support 10 is annularly arranged along the sinkers' 8 bed 3 and in a preferred embodiment are on his bottom side mounted sinkers' 8 needle cams 7.
• the tensioner 92 of plush loops is in a preferred embodiment fitted with a step 922 arranged on his front edge closer to the machine axis and plugged into the gap between the needle cam 91 immovable in radial direction and the needle cam 7.
• the upper side of the tensioner 92 of plush loops is fitted with a lug 923 aligned with radially arranged groove in the needle cam 7.
• On the bottom side of the tensioner 92 of plush loops adjacent to the upper side of the sinkers' 8 bed 3 is arranged a cam channel 924 of the tensioner 92 of plush loops, whose vertical walls affect back sinkers' 81 butts 8 and they control their radial movement.
• the tensioner 92 of plush loops is in the radial direction to the machine axis adjusted by a set screw 925 and it is being returned by a spring 926.
• the knitting process on the sinkers 8 and the needles 6 runs in a well- known manner.
• the embodiment of the cam system controlling the sinkers 8 is apparent in particular from following description of the machine function. For the purposes of this description of the machine function is as a starting position considered a position shown in Fig. 1, where the sinkers 8 are drawn- down in the starting back position that is they are in the maximum distance from the machine axis.
• the sinkers 8 controlled by this part 913 have a trajectory 915 with a lower steepness (grade) towards the machine axis than is the grade of their trajectory 916 in the front end 921 of the tensioner of plush loops.
• grade the grade of their trajectory 916 in the front end 921 of the tensioner of plush loops.
• the angle of fall of the sinker 8 to the tensioner 92 which is given by the difference between the angle of the part 913 and the angle of the front end 921 of the tensioner 92 is due to the grade adjustment of the transition parts substantially lower than in known arrangements, when on the tensioner 92 bump the butts 81 , 82 of radially not moving sinkers 8.
• the considerable advantage of this embodiment is that the beginning of drawing-out the sinkers 8 from the position for sinking the thread is not changed even with a change of adjustment of following the tensioner 92 of plush loops. This enables together with the arrangement of the cylinder cam system to precisely control also tensioning of the ground thread 126 and distinctively positively influence the quality of knitting.
• the back end 927 of the tensioner 92 is then formed that it gradually draws-down the sinkers 8 with the steepness which is smaller than the steepness of draw-down the sinkers 8 in the following needle cam 91 immovable in radial direction, in which continues drawing-down the sinkers 8 back to the starting maximally drawn-down position.
• the entire cycle of sinker 8 movement repeats in the next cam system.
• the front end 131 with flat gradient and the following steeper lifting part 134 of the central cam 13 lifts the needles 6 up to reach the most lifted position on top 132 of the central cam 13, where the movement direction of the needle 6 turns and the needle 6 is drawn-down by the following part 133 of the central cam 13 with the grade, which is in the beginning basically constant and at the same time steeper than it is in following sections of the central cam 13 and consequently is the drawing-down the needle 6 stopped by the arc 135 of the cam channel of a more gradual curvature than is the curvature in the point of highest lift of the needles 6, while the needle 6 butt 61 further continues in tuck position in horizontal movement in the back end 136 of the central cam 13, where from it transits to directly following front end 141 of the draw-down cam 14.
• the gradual curvature stopping drawing-down the needle 6 before the back end 136 of the central cam 13 is designed so that there happen no distinctive bouncing of the needle 6 butt 61 against the walls of the central cam 13 and so that the needle 6 butt 61 leaves the central cam 13 and enters the draw-down cam 14 basically in a horizontal movement.
• the gradual stopping of the needle 6 opens the needle 6 latch in consequence of inertia forces acting on it and keep it in an open position without bounces and vibrations so that the needle 6 with the open latch can easily pass before the guide part 12 of the thread 126, 127 guide 11 in the place of feeding the ground thread 126 and the plush thread 127 into the knitting system and so that the latch hit an entering edge 121 of the guide part 12 of the thread guide 11.
• the beginning of the arc 135 of the cam channel stopping the drawing-down the needles 6 is advantageously situated before the beginning 122 of the entering edge 121 of the guide part 12 of the thread guide 11 and the end of this arc 135 is situated behind this beginning.
• such arranged guide 11 is the ground thread 126 by a well known manner fed through an opening 123 of basically vertical direction (i.e. in principle parallel with the machine axis 3) into the sinker 8 throat 85 and the plush thread 127 is fed through an inclined opening 124 situated before the opening 123 for feeding the ground thread 126 and coming out so that the plush thread 127 is precisely lead into the place lower than is the needle 6 hook point and higher than is the upper edge of the sinker 8 nib 84.
• a lug 125 advantageously as a pin guiding an elastan fiber 128 into the sinker 8 throat 85.
• the elastan fiber 128 is fed through a pulley mounted on the thread guide H and around the mentioned lug 125 it rotates and along the outer part of the thread guide jM it is fed into the sinker 8 throat 85 under the needle 6 hook.
• Using this embodiment of the invention is in a knitted fabric advantageously reached very good plating of elastan fiber 128 from one side by the ground thread 126 and from the other side the plush thread 127 because this fiber 128 is fed in the exact position for correct lapping between both threads 126, 127.
• On the outer side of the thread guide H can be in the represented embodiment shown in the Fig. 7a, 7b, arranged a nose with a groove 1250 for guiding of elastan fibre 128.
• the lug 125 created by other suitable means.
• the draw-down cam 14 passes the needle 6 butt 61 through a front end 141 in basically horizontal direction, drives onto slightly sloping upper side of the draw-down cam 14 front end 141 and by the following curvature of the draw-down cam 14 is the needle 6 accelerated into the drawing-down part 142 and it is translated to the sinking.
• the front end 141 of the draw-down cam 14 fitted with guiding section with double-sided narrowing to the width corresponding to the width of the needle 6 butt 6_1 with an appropriate clearance.
• This guiding section of the front end 141 of the draw-down cam 14 is further followed by the part 142 of the draw-down cam 14 drawing-down the needles 6 to the sinking.
• the needle 6 shortly stays in this position and than the butt 6J. gets into the lifting part 145 and to the back end 146 of the draw-down cam 14, where the needle 6 starts to lift with the same or lower steepness than the steepness of the back end 131 of the directly following cam system central cam 13, which significantly lowers the angle of fall of the needle 6 butt 61 on the central cam 13 and consequently also the impacts during transferring the needles 6 from the draw-down cam 14 to the central cam 13.
• a significant advantage here is that during changes of sinking there is no shift of the point 143, where the needle 6 starts to lift from the sinking against the point, in which after sinking of the needles 6 is renewed drawing-out the sinkers 8 by an appropriate part of the needle cam 91 immovable in radial direction controlling the movement of the sinkers 8.
• a creeping ramp 86 on a sinker 8 belly 83 closes newly formed loop of the ground thread 126 and this way it maintains its proper length for production of a quality knitted fabric.
• a well known principle of centre control of needle 6 sinking depth can be advantageously used.
• needle cams 4 of the cylinder cam system are mounted on a cylinder needle cam 4 support 4_1, whose position in the machine axis direction is by a well known manner controlled by the means for central control of the sinking depth. This way is at same time changed the position of all draw-down cams 14 and sinking in all systems. For the proper function of tensioning of the plush loops it is necessary so that while changing the central sinking adjustment is the height position of the needles 6 according to the sinkers 8 during tensioning left unchanged.
• needle cams 5 of the cylinder cam system consisting of lifting part of the cam channel, i.e.
• the central cam 13 mounted on the member 42 arranged on the cylinder needle cam 4 movably in the machine axis direction and connected by the connecting means with the cams support 10 or cams of the sinkers' 8 cam system.
• These connecting means are in a preferred embodiment formed by an arm 44 pressed down by a bearing surface 47 on one of its ends using a disc spring 46 and a screw 45 on the bottom side of the sinkers' 8 needle cams 7 support 10.
• the arm 44 fitted a groove 441, into which in the direction parallel to the machine axis plugs in a coupling disc 421 arranged on the upper end of the member 42 on which is fixed the needle 6 central cam
• the invention is applicable in the art of knitting machines for production of plush fabric.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Knitting Machines (AREA)

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• 2003
  • 2003-10-14 CZ CZ20032801A patent/CZ20032801A3/cs unknown
• 2004
  • 2004-10-13 TW TW93130965A patent/TW200523419A/zh unknown
  • 2004-10-14 CN CNA2004800302881A patent/CN1871388A/zh active Pending
  • 2004-10-14 WO PCT/CZ2004/000065 patent/WO2005035847A2/en active Application Filing
  • 2004-10-14 EP EP04762317A patent/EP1692331A2/en not_active Withdrawn

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