FR2669352A1 - CART FOR CLEANING KNITTING BODIES OF A KNITTING MATERIAL. - Google Patents

Abstract

The cleaning carriage has an open chamber (10) covering the knitting members (3,4), a blowing nozzle (16,17) supplied with compressed air oriented inside the chamber (10) towards the members and a chimney (11), connected to the chamber (10) for the evacuation of the polluted air and the collection of waste, for example in a bag (13). For a double needle bed loom, the chamber (10) covers the knitting members of the two needle beds (1,2), the chimney (11) opens into the plane of symmetry of the needle beds and there are two blowing nozzles (16,17 ) facing the chimney (11). Preferably a positioning pad (15), acting as a deflecting partition, divides the chamber (10) in two and enters the housing (19) between the two needle beds (1,2).

Description

TROLLEY FOR CLEANING KNITTING BODIES

OF A KNITTING SKILL

  The present invention relates to the cleaning of the mechanical members on which the dust, fibers, fatty particles cling during the operation of a knitting machine, and more precisely the mechanical knitting members

  -05 located at the level of the needle bed of the loom.

  The passage of yarns and in particular fiber yarns on these knitting members causes by abrasion an accumulation of fiber flocks and particles of fatty substances used for the lubrication of yarns. This accumulation occurs in particular on the felling teeth of the needle beds. It is at the origin of knitting incidents and also of pollution of knitwear. Various techniques have been used to try to avoid or limit these accumulations. The most common technique consists in carrying out periodic preventive cleaning by blowing on the knitting members using nozzles either manipulable manually by the operator, or by remains in the circular trade in particular The result obtained by this blowing is not entirely satisfactory since the wads unhooked

  organs go into the atmosphere and re-deposit again.

  For circular knitting looms, document US Pat. No. 3,535,895 has proposed a cleaning device fully integrated into the loom. This device comprises two annular chambers surrounding the needle bed of the loom, one supplied with compressed air with directed injection slots. towards the knitting units and the other connected to a vacuum source collecting the air flow

  after unhooking of dirt.

  This device is bulky, it reduces the accessibility to the knitting members, it only concerns the trades to

knit circular.

  In the field of rectilinear knitting machines, it has been proposed to integrate suction nozzles into the cam carriage, but such a system does not allow effective takeoff of

  wads adhering to metal parts.

  The aim set by the applicant is to propose a device which can be applied to all knitting machines, circular and straight, which performs effective cleaning of

  knitting bodies and which is of a simple embodiment.

  This object is perfectly achieved by the device of the invention. It is a device for the periodic cleaning of the knitting members of a knitting machine. Typically, this device is in the form of a carriage capable of being moved on the needle bed or beds above said members and it comprises: a) an open chamber covering said knitting members, b) a blowing nozzle supplied with compressed air and oriented towards the zone corresponding to said members inside the room, c) a chimney, connected to the room, for the evacuation of

  the air after it has passed over the knitting members.

  The jet of compressed air allows effective removal of the dust, fibers and fatty particles which adhere to the knitting members, and which are immediately evacuated by the chimney, all along the needle bed as the device moves. covers the part of the bed above the bodies in a sufficiently airtight manner that the flow of polluted air is directed only towards the exhaust chimney However the front and rear sides of the room are not in contact with the needle beds, they are shaped to allow the passage of knitting devices needles, valves, felling teeth, whatever the position of these above the level of the needle In this text we say that the room is open the fact that it has no bottom, this being constituted by a part of the needle bed, and that it has front and rear faces sufficiently open for the passage of o rganes

knitting.

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  Preferably, the device comprises an additional blowing nozzle, supplied with compressed air, which is placed in the evacuation chimney and oriented downstream thereof. The additional air flow increases the efficiency of the first flow and prevents dust or fibers from settling

In the chimney.

  Preferably, the evacuation chimney is terminated by a waste collector, which can be a bag made of a porous material or a container provided with a grid allowing the passage of air and stopping the waste The presence of the complementary flow is particularly useful in the case of the bag, when the porosity of the bag decreases due to the accumulation of waste. According to a preferred embodiment, the device

  is intended for cleaning a double needle knitting machine.

  In this case, the device comprises a single chamber which covers the knitting members of the two needle beds, a single exhaust chimney opening into the chamber above the central knitting zone and two blowing nozzles, one for each needle bed, the two air jets being generally oriented

to the exhaust chimney.

  Preferably in this version, the device comprises a deflecting partition, mounted inside the chamber and at least partially of the exhaust chimney This partition has the function of deflecting towards the interior of the chimney the two flows of air coming from each of the nozzles, so that there is no turbulence in the chamber which can cause the deposit of waste inside the chamber and on the knitting members during moving the device. Advantageously, the device comprises a positioning pad, suitable for being placed in the housing between the two needle beds, and the front and rear edges of which are rounded. This pad facilitates the guiding of the device during its movement on the loom The rounded edges avoid hanging the wires in

knitting course on the loom.

  Preferably the positioning pad is equipped with elastic displacement means in height, so that the pad will, following the bottom of the housing between the two needle beds, follow

  the surface defined by the knit without risk of damaging it.

  In the aforementioned preferred version, the deflecting partition is adapted to also act as a positioning pad. As this is a device whose movement is manual, the carriage includes a grip handle equipped with a trigger for controlling the supply of compressed air to the blowing nozzle or nozzles. The exhaust chimney being in a

  rigid and angled material can act as a handle.

  The movement of the device can be linked to that of certain parts of the loom For example, in the case of a rectilinear or circular loom having a movable cam holder system, the device can include securing means to make

  the carriage attached to the cam holder system.

  For example, in the case of a circular loom with a rotating needle bed, the device according to the invention is at a fixed position between two falls, the movement of the carriage relative to the needle bed

  being provided by the rotating needle bed.

  Advantageously, the relative movement of the carriage relative to the needle bed is carried out at moderate speed, the loom

  possibly being programmed to do this.

  The invention will be better understood on reading the

  description which will be made of the preferred embodiment of a

  manual cleaning trolley for rectilinear double needle bed illustrated by the appended drawing in which: view FIG. 1 is a diagram illustrating the principle of the trolley FIG. 2 is a cross-sectional view of the chamber FIG. 3 is a front view along the axis AA ′ in FIG. 2 of the positioning pad. FIG. 1 shows in cross section the

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  two needle beds 1 and 2 of the loom with their needles 3 and their

felling teeth 4.

  The cleaning carriage 5 is placed above the inverted V-shaped upper part of the two needle beds 1 and 2. The side walls 6, 7 are in contact with the needle beds 1, 2; they are in a material allowing the relative sliding compared

  with metal needle beds, for example in a plastic material.

  These side walls 6,7 are extended by the upper walls 8,9 which are substantially respectively parallel to

  the general direction of the needle beds 1,2.

  The upper walls 8, 9 define with the side walls 6, 7 the cleaning chamber 10 which overhangs the two needle beds 1, 2 and the parts of the needles 3 and of the felling teeth 4 in contact with the threads during knitting, at the image

of a bridge.

  The exhaust chimney 11 opens into the chamber 10 in line with the plane of symmetry of the two needle beds 1,2. It has a bent shape. At its free end 12 is fixed a bag 13 made in

  porous material using a collar 14.

  A deflecting partition 15 is mounted along the plane of symmetry of the two needle beds 1,2; it is integral with the upper walls 8.9 and / or the chimney 11 It cuts the cleaning chamber 10 into two separate compartments, one 10 a corresponding to the first needle bed 1, the other l Ob to the second

bed 2.

  The carriage 1 is equipped with * three blowing nozzles 16,17,18, supplied with compressed air Two nozzles 16,17 penetrate into each of the compartments 10 a, l Ob of the chamber 10 Each is oriented obliquely to the plane of the corresponding needle bed, and towards the knitting members that are the needles 3 and the felling teeth 4 The third nozzle 18 enters the evacuation chimney, being directed towards the bag 13.

  The cleaning cart works as follows.

  Periodically when there is a certain accumulation of waste near the knitting members, the operator takes the manual carriage 5 and places it on the loom in the position where it is represented in FIG. 1, the lower part of the partition 15 being in the housing 19 between the two beds and the walls

  side 6.7 bearing on the top of the needle beds 1.2.

  The operator operates the trigger for controlling the compressed air supply, not shown, by gripping the angled part of the chimney 11, acting as a handle. The compressed air, at a pressure of for example between 3 and 6 bars, takes off the waste adhering to the knitting members and to the needle bed at the level of each of the compartments 10 a, l Ob and entrains them into the chimney 11 and into the bag 13 collector The jet of air coming from the auxiliary nozzle 18 helps to propel the

waste in the bag 13.

  The operator moves the carriage 5 at low speed, for example from 0.2 to 0.5 m / s, along the loom so as to proceed

to a complete cleaning.

  Once the cleaning operation is complete, the carriage 5 is either removed from the loom and is implemented on another loom, or it is put in the parking position on the loom, at one or the other end of the loom , apart from the needle beds We understand that during cleaning the thread guides are

cleared from the beds.

  FIG. 2 shows an exemplary embodiment of the blowing chamber 24 in which the blowing nozzles, 21 are pipes hollowed out in the walls 22, 23 of the chamber 24 The spacing e between the internal face of the wall upper 22,23 and the needle bed is sufficiently small, with regard to the length L of the chamber, measured in the direction of movement of the carriage (FIG. 3), so that the air jet coming from line 20 is effectively directed towards the knitting members then towards the chimney 33 without being deflected towards the anterior and posterior openings of the chamber In the embodiment illustrated in FIG. 2, the spacing e

  is 5 mm, for a length L of the order of O Omm.

  FIG. 3 shows an exemplary embodiment of the deflecting partition, acting as a positioning pad 25 This pad 25 is a plate whose lower part 28 has its front edges 26 and rear 27 rounded The pad 25 is movable in height , with permanent downward stress under the effect of two springs 29.30, limited by two stops

31.32, for example two pins.

  The pad 25 can move on the knitted fabric being formed in the housing 19 between the two needle beds 1,2 without damaging the latter. It therefore has a function of centering the carriage 5. The air jet coming from the nozzle 21 is, after cleaning the knitting members, deflected by the shoe 25 in the conduit

the chimney 33.

  The invention is not limited to the manual cleaning trolley for a double needle straight knitting machine which

  has just been described, but covers all variants thereof.

  The carriage can, for example, be adapted to double-needle circular knitting machines, in which the needle beds are visible. In this case, the angle formed by the two upper walls will be a right angle, one wall being vertical and the other horizontal. carriage will be placed between two successive falls It may be in two separate chambers as above for the simultaneous cleaning of the knitting members of two needle beds or it may be adapted for the cleaning of a single needle bed; in the latter case there will be two carriages located at two places on the loom, each for cleaning a needle bed The carriage will preferably be secured to the cam holder system on looms with fixed needle beds and rotating cams;

  it will be fixed on the rotary needle looms.

  For straight knitting looms, the carriage of the invention can also be adapted to move at the same time as the cam holder system, being either mechanically interlockable with said system, or incorporated into said system. In the latter case, preferably the carriage will comprise two separate bedrooms

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  and retractable, a room for each needle bed; in normal operation of the cam holder system, the chambers will be retracted so as not to come into contact with the wire guides; they will be positioned above the needle beds, in accordance with the invention, during the cleaning cycle, the

  wire guide being put out of reach.

Claims (8)

  1 Device for the periodic cleaning of the knitting members (3,4) of a knitting machine, characterized in that it is in the form of a carriage capable of being moved over the needle bed (s) (1,2 ) above said members and in that it comprises: a) an open chamber (10) covering said knitting members (3,4), b) a blowing nozzle (16,17) supplied with compressed air and oriented towards the zone corresponding to said members inside the chamber, c) a chimney (11), connected to the chamber (10), for the evacuation of air after it has passed over the knitting members. 2 Device according to claim 1 characterized in that it comprises an additional nozzle (18) for blowing, supplied with compressed air, which is placed in the exhaust chimney (11)   and oriented downstream of it.   3 Device according to one of claims 1 or 2 characterized in   that the exhaust chimney (11) is terminated by a bag   porous (13) waste collection.   4 Device according to claim 1 for cleaning a double needle knitting machine characterized in that it comprises a chamber (10) which covers the knitting members (3,4) of the two needle beds (1, 2), a exhaust chimney (11) opening into the chamber (10) above the central knitting area (19) and two blowing nozzles (16,17), one for each needle bed, the air jet being in the direction of the exhaust chimney. Device according to claim 4 characterized in that it comprises a deflecting partition (15) mounted inside the chamber (10) and at least partially of the exhaust chimney   (11) above the central knitting area.   6 Device according to claim 4 characterized in that it comprises a positioning pad, capable of being placed in the housing (19) between the two needle beds (1,2), and whose edges   front (26) and rear (27) are rounded.   7 Device according to claim 6 characterized in that the positioning pad (25) is equipped with elastic displacement means (29,30) in height, so that the pad goes, following the bottom of the housing (19) between the two needle beds, follow   the surface defined by the knit without risk of damaging it.   8 Device according to claim 1 characterized in that, the displacement being manual, the carriage (5) comprises a grip handle equipped with a trigger for controlling the supply of   compressed air from the blowing nozzle (s) (16,17,18).   9 Device according to claim 1 for cleaning a knitting loom having a movable cam holder system characterized in that it comprises securing means to make the   carriage integral with the cam holder system.   Device according to claim 1 for cleaning a circular knitting machine with a rotating needle, characterized in that   that it is mounted in a fixed position between two falls from the loom.   11 Device according to one of claims 9 or 10 characterized   in that the movement control of the movable member is programmed for movement at reduced speed during the cycle of cleaning.