FR2567164A1 - Tubular tricot unwinding appts. - Google Patents

Abstract

The unwinding head is supported at a carrier system which is raised and lowered. At the lowered position, the unwinding head is at man height and, in the raised and operating position it is generally vertically above the guide and layout unit. Specifically the carrier system is a frame (42) with two swing arms (43) to carry the unwinding head (8) at their free ends, by pivoting on a horizontal axis (44) on the main frame (34). Operating cylinders (48), between the swing arms (43) and the main frame (34), have their ends secured to each through pivoting linkages. The telescopic swing arms (43) can be adjusted for length.

Description

Knitting and twisting machine.

 The present invention relates to a machine for twisting and opening knits produced on a circular loom.

 A circular knitted fabric requires its opening in the longitudinal direction and its setting off for its treatment on fixing ream.

 This knitted fabric having been washed or dyed, either in an aqueous medium or in a solvent medium, was found to be twisted by the principle of stirring during this operation.

The opening requires following a mesh, marked with knitting to obtain a "straight mesh" fabric, it is mandatory to use a machine that
1. untwisting or untwisting the knitting, using a "twisting head"
2. cuts the knit lengthwise by following a stitch identified by knitting known as "slip stitch" which is nothing other than a permanent defect provoked by the removal of a needle on an urn of the knitting loom;
3. deploys knitting using the V principle
4. place it in folds in the train feed cart.

 The fabric can be dry or wet.

 For proper operation responding to the speeds of industrial production, the untwisting and opening machines known until now must have the shaping head located as high as possible (for example 6 meters), generally near the ceiling of the workshop. This high working position of the bending head is necessary so that the fabric has time to unwind and it is all the greater the higher the production speed of the machine.

 On known machines, the untwisting head is fixed to a very high overhead turret built above the machine, this turret must also allow operator access for threading the fabric into the untwisting head , each time the machine is primed, and for the maintenance of this head.

 The machines to untwist and open, known so far, therefore have a large footprint, difficult assembly and they force the operator to many ascents and descents of the staircase or the turret ladder, which cause of fatigue, a waste of time and sometimes a danger, especially in a dye shop on a floor always wet.

 The present invention aims to remedy these drawbacks.

 The invention relates to a twisting and opening machine in which the twisting head is carried by a lifting system adapted to lower said head to breast height for threading the knitted fabric into said head and to raise it up to '' at normal working height above the machine during normal machine operation.

 Preferably, the aforementioned lifting system comprises at least one pivoting arm or arrow, articulated on the frame of the machine and actuated by one or more jacks, with fluid under pressure or with electric control.

 The invention will be better understood on reading the detailed description which follows and on examining the appended drawings which represent, by way of nonlimiting example, an embodiment of the invention.

Figure 1 is a side view of the machine showing, in solid lines, the distortion head in
its high working position and, in broken lines, the detorsion head in its low position
Figure 2 is a front view of the machine, with the twisting head in the up position.

 FIG. 1 shows the fabric 2 which has been brought in bulk, twisted, in the dry or wet condition, in a feed tank 4 mounted on a pivoting motorized platform 6.

 your machine being in operation, the strand of twisted fabric 2 ′ passes through a twisting head 8 of known type, located, in the working position, at a height H, as large as possible and, for example, of the order of 6 or more bolsters.

 The principle of operation of a detorsion head is sufficiently known that it suffices to recall that the head comprises a rised motorcycle ring mechanism, in which the fabric passes, rotating in one direction and in the other according to the direction of the twist of the fabric This twist acts as a thread "thus causing the displacement of contact cylinders equipped with magnetic cells which control the rotation of the untwisting ring in one direction or the other.

 The fabric tube 2 ", after passage and twisting in the head 8 descends towards an opening head 10 which comprises a member for guiding and orienting the fabric, such as a basket 12, the diameter of which is adjusted according to the diameter of the tubular fabric 2 "by means of a crank 14. A cell 16 takes reference to the mesh marked with knitting, known as a" slip stitch ", and controls the pivoting of the basket 12 around its vertical axis 18 to guide this mesh towards a blade circular 20 which cuts the tri-cot in this stitch.

 The fabric thus opened in the direction of its length is unfolded, that is to say put wide, by a guide 22 in the shape of V. The knitted fabric laid flat 2 "'passes over guiding rolls, drive and evacuation 24, 26, 28, 30. All these various elements, as well as the control panel 32, are carried and housed in the case 34 of the machine.

 After passing over the cylinder 30, the fabric 2m laid flat passes over a folding arm 36, 38 animated by a reciprocating movement of adjustable amplitude which deposits the folded fabric in a receiving carriage 40 which will be then routed to the next processing machine, such as a dryer or oar.

 According to the invention, the warping head 8 is carried by a lifting system making it possible to lower and raise this head between the working height H (position shown in solid lines in FIGS. 1 and 2) and a height h (shown in dashed lines in FIG. 1) for which the twisting head 8 is at breast height and allows threading of the fabric into the head, .a priming of the machine, as well as maintenance of the head.

 According to the embodiment shown in FIGS. 1 and 2, the lifting system comprises a jib frame 42, comprising two arms 43, 43 ′, which is pivotally mounted at 44 on the upper part of the frame 34 of the machine and carries to its free end 46 the twisting head 8.

 Two hydraulic cylinders 48 having one end 50 articulated on the frame 34 of the machine and the other end 52 articulated on each of the pivoting arms 43, 43 ′ are controlled from the control panel 32 of the machine to raise and lower the head of torsion 8. Preferably, the arms 43, 43 ′ are telescopic arms, for example composed of two square tubes sliding one inside the other and allowing, whatever the positioning in height, that the torsion head is always located substantially vertical to the opening and cutting head 10.

 The invention therefore makes it possible to do away with the bulky and dangerous aerial traffic lights used up to now, since it suffices, for the threading of the fabric and the maintenance of the twisting head 8 to lower the latter up to at height h.

 The operator can then perform his work, at eye level, more quickly, without unnecessary fatigue and without danger. On the other hand, it is possible to raise, in the working position, the warping head up to the maximum height allowed by the height of the workshop ceiling, which is advantageous for the good functioning of fast machines.

 Of course, the invention is not limited to the embodiment which has been particularly shown and described.

 Thus the lifting system could be actuated by pneumatic, electric or manual means and the lifting arms could be sliding instead of being pivoting.

Claims (6)

RESELL CATIONS  1. Knitting and twisting machine which comprises a twisting head (8), a frame (34) in which are housed a guide and orientation member (12) of the tubular knit (2 "), a cutter (20) of the tubular knit and the discharge members (22, 24, 26, 28, 30) out of the knit machine (2 "') open and laid flat, said machine being characterized in that the twisting head (8) is carried by a lifting system (42, 48) adapted to lower said head to breast height (h) for threading the knitted fabric and to raise said head to a normal height (H) of work, substantially vertical to said guide and orientation member (12), during normal operation of the machine.  2. Machine according to claim 1, characterized in that the lifting system comprises a jib frame (42) comprising two pivoting lateral arms (43, 43 ') supporting at their free end (46) the untwisting head (8).  3. Machine according to claim 2, characterized in that the lateral arms (43, 43 ') are pivotally mounted about axes (44) carried by the frame (34) of the machine.  4. Machine according to claim 3, characterized in that the raising and lowering of the boom frame (42) are controlled by pressurized fluid cylinders (48) articulated, at one of their ends on the frame (34) of the machine and, at their other end, on the pivoting side arms (43, 43 ').  5. Machine according to one of claims 2 to 4, characterized in that the pivoting lateral arms (43, 43w) are telescopic arms of adjustable length.  6. Machine according to one of claims 1, 2, 3 or 5, characterized in that the lifting system is actuated, for raising and lowering the twisting head (8), by electrical means , mechanical or manual.