Device and method for producing knitted fabric

Abstract

A device and a corresponding method produce a knitted fabric with a knitting machine and a roving drawing and strengthening unit. The device has a roving supply unit with a roving, a stretching unit linked to the roving supply unit, and a spinning nozzle device provided downstream from the stretching unit in a roving conveying direction of the device forming a fiber strengthening segment by applying compressed air. An end thread gripping roller pair rotatable in opposite directions is provided downstream from the spinning nozzle device in the roving conveying direction delimiting the fiber strengthening segment. The device has a blow-off device for blowing off the spinning nozzle device and/or the stretching unit and a suction device for suctioning off loose fibers from the spinning nozzle device and/or the stretching unit. The suction device and the blow-off device are interconnected in a blow-off and suction system.

1 - 12 . (canceled) 
     
     
         13 . A device for producing knitted fabric, comprising:
 a knitting machine;   a roving drawing and strengthening unit having a roving supply unit with at least one roving, a stretching unit coupled with said roving supply unit, a spinning nozzle device disposed downstream from said stretching unit in a roving conveying direction of the device forming a fiber strengthening segment by applying compressed air, and an end thread gripping roller pair rotatable in opposite directions and disposed downstream from said spinning nozzle device in the roving conveying direction and delimiting said fiber strengthening segment;   at least one blow-off device for blowing off said spinning nozzle device and/or said stretching unit;   at least one suction device for suctioning off loose fibers from said spinning nozzle device and/or said stretching unit;   a blow-off and suction system, said suction device and said blow-off device are interconnected in said blow-off and suction system;   at least one air channel running along over said end thread gripping roller pair;   said suction device having a suction air cleaning device with at least one ventilation device, said suction air cleaning device having at least one exhaust air outlet connected to said at least one air channel; and   said at least one air channel having at least one channel opening aligned on or along said spinning nozzle device and/or on or along said stretching unit.   
     
     
         14 . The device according to  claim 13 , further comprising a lint filter assembly having a perforated drum with at least one lint filter layer disposed around said perforated drum, said perforated drum disposed on an underpressure side of said ventilation device. 
     
     
         15 . The device according to  claim 14 , further comprising:
 a hole-free panel disposed in an inner circumference of said perforated drum; and   a wiping device disposed on an outer side of said perforated drum opposite said hole-free panel.   
     
     
         16 . The device according to  claim 15 , further comprising a gear ring disposed around said inner circumference of said perforated drum for adjusting a position of said perforated drum in relation to said wiping device. 
     
     
         17 . The device according to  claim 13 ,
 further comprising an auxiliary thread supply through which at least one auxiliary thread can be supplied to said stretching unit; and   wherein said at least one air channel at least partially also runs along over said auxiliary thread supply and contains said at least one channel opening, which is aligned on or along said auxiliary thread supply.   
     
     
         18 . The device according to claim  1 , wherein:
 said suction device has a plurality of suction channels; and   said suction air cleaning device is a collective suction air cleaning device into which all said suction channels lead.   
     
     
         19 . The method according to  claim 13 , further comprising a suction collection channel formed in a conical fashion in its length expansion, extending parallel to said air channel and is disposed between said suction air cleaning device and at least one suction channel of said suction device. 
     
     
         20 . A method for producing a knitted fabric, which comprises the steps of:
 supplying at least one roving to a stretching unit by a roving supply unit;   applying compressed air to a drawn roving exiting the stretching unit by a spinning nozzle device in a fiber strengthening segment, being thus strengthened, wherein the fiber strengthening segment is delimited by an end thread gripping roller pair rotating in opposite directions through which a drawn, strengthened roving is led in clamped fashion and an end thread exiting the end thread gripping roller pair is supplied to a knitting machine;   blowing off the spinning nozzle device and/or the stretching unit via at least one blow-off device;   suctioning off exhaust air by means of at least one suction device on the spinning nozzle device and/or the stretching unit;   leading suction air to a suction air cleaning device, in the suction air cleaning device an underpressure is generated by means of at least one ventilation device, through the suction air cleaning device loose fibers are led out of the suction air; and   putting cleaned exhaust air gained from the exhaust air under excess pressure, the cleaned exhaust air being under excess pressure is led, starting from the suction air cleaning device, in at least one air channel running along over the end thread gripping roller pair and through at least one channel opening of the air channel by forming at least one air curtain aligned to or along the spinning nozzle device and/or on or along the stretching unit.   
     
     
         21 . The method according to  claim 20 , which further comprises leading the suction air through at least one lint filter device connected to an underpressure side of the at least one ventilation device, the lint filter device having a perforated drum with at least one lint filter layer provided around the perforated drum, wherein loose fibers contained in the suction air are collected by the lint filter device. 
     
     
         22 . The method according to  claim 21 , which further comprises:
 providing a hole-free panel in an inner circumference of the perforated drum;   providing a wiping device on an outer side of the perforated drum opposite the lint filter layer; and   providing a gear ring on the inner circumference of the perforated drum, wherein a position of the perforated drum is adjusted in relation to the wiping device by means of the gear ring in temporal intervals.   
     
     
         23 . The method according to  claim 20 , wherein the at least one air channel also runs along over an auxiliary thread supply and at least one air curtain is aligned on or along the auxiliary thread supply by means of the at least one channel opening of the air channel. 
     
     
         24 . The method according to  claim 20 , which further comprises leading the suction air suctioned off on the device collectively to the suction air cleaning device, whose cleaned exhaust air is led over the spinning nozzle device.