FR2542333A1 - DEVICE FOR PRESENTING A FRAME IN FRONT OF A HANDWOOD FINGER HANDPIECE AND WEAVING EQUIPPED WITH SUCH A DEVICE - Google Patents

Abstract

THE INVENTION RELATES TO THE WEAVING INDUSTRY. THE DEVICE INCLUDES A FIRST MECHANISM 1, 12 FOR FOLDING THE WEFT T, A SECOND MECHANISM 14, 14A, 27 FOR PRESENTATION AND PINCHING OF THE WEFT IN FRONT OF THE NEEDLE 13 OF THE TRADE, AND A THIRD MECANISM 37, 39 FOR CUTTING THE WEFT. EACH OF THE MECHANISMS IS CARRIED BY A FIXED PART OF THE TRADE FRAME AND IS ACTIVATED INDIVIDUALLY BY A CAM ROTATING IN SYNCHRONISM WITH THE MAIN SHAFT OF THE TRADE. APPLICATION TO HIGH-SPEED Looms.

Description

Device for presenting a weft in front of a passing needle

loom and craft

  weaving machine equipped with such a device.

  The invention relates to weaving machines and, in particular, to a device for presenting a weft in front of a passetram needle,

  device which is located between a pass eyelet

me and the edge of the fabric.

  The insertion of the weft in the crowd of some weaving machines is carried out using

  two pass-through needles, one of which

  and an exit needle animated by a movement

  back and forth in the opposite direction.

  The input needle must grab the thread of

  stored frame from a reserve located outside the

  of the machine For taking the weft by

  the pass-frame, it is necessary to present the

  in a specific place corresponding to the point

gripping the pass-frame.

  Various methods are known for pre-

  of a weft in front of a passing needle

  frame In general, the weft is stretched between two nip points, on the one hand closest to the

  width and on the other hand in a tensioner, the frame

  from a spool on the outside of the tensioner

and the machine.

  The first setting up of the frame in the clamp is done manually before starting the machine A clamping member and wire cutter oscillating on a horizontal axis carrying perpendicularly on this axis a clamp and a knife, is combined of

  to ensure that the weft is pinched in a first

  first time, to cut it once pinched this gold-

  Each cycle is controlled by the wing.

  The maintenance of the frame once cut is provided by two cooperating parts of the device. The weft is thus ready to be inserted. The advance movement transmitted to the weft-threading needle enables the latter, by means of its gripper, to take the weft in passing to insert it into the crowd. transfer it to the opposite needle, the needle passing back to the starting point

rid of the frame.

  After the exit of the thread needle from the web, the clip and cutter member opens as

  scissors This organ is controlled by the wing.

  Meanwhile, the weft slipped into a beak of gold-

  the clamp closes and the wire cutter, the whole closes, the frame is folded, pinched and cut The cycle can

so start again.

  The known frame presentation set

  which has just been described, has certain disadvantages

  especially for fast looms.

  The gripper and cutter member is mounted on the leaf and follows its movement, a fixed ramp fixed to the frame of the machine controls the opening and the

  closing the clamp and the wire cutter This maneuver

  is made near the dead center before, after the exit and before the entry of the needle

frame pass in the width.

  The inertia transmitted by speed to the organism

  pliers and wire cutters tend to bounce this gold

  In spite of a brake on the control axis of the clamp and the knife, excessive braking results in rapid wear of the control elements. Another risk exists: for the sake of convenience, the operator can operate the gripper and wire cutter manually; an omission of closure

  on its part causes significant material damage.

  The present invention aims to remedy

to these disadvantages.

  The subject of the invention is a device for

  presentation and cutting of the weft which is entirely

  carried by a fixed part of the craft frame

  and which is positively controlled by a tree with

  my turning in synchronism with the main shaft

of career.

  None of the organs of the device being

  by the wing, the operating difficulties caused by the forces of inertia in the known devices are eliminated and, on the other hand,

  to the positive control by cams of the different or-

  mobile devices, it is possible to increase the

speed of the craft.

  According to the invention, the device comprises at least one folding mechanism, pinching and presentation in front of the needle of the portion of the frame between a guide eyelet and the edge of the fabric; and a cutting mechanism of the end of the weft located near the edge of the fabric, each of said mechanisms being carried by a fixed part of the frame

  of the loom and being operated individually-

  by a cam rotating in synchronism with

the main tree of the craft.

  According to a preferred embodiment of

  the invention, the folding mechanism

  the weft is constituted by a first mechanism for folding the weft and by a second mechanism of nipping and presentation of the weft, each of said first and second mechanisms being carried by a part

  of the building of the loom and being individually

  dually by a cam carried by a tour-

  in synchronism with the main tree of the

  l O tier, the cutting mechanism constituting a third mechanism which is actuated by a third cam carried by a shaft rotating in synchronism with

the main tree.

  Preferably, the three cams of the three

  canisms are mounted side by side on a tree

  rotating in synchronism with the main shaft

of career.

  The subject of the invention is also the

  weaving machines equipped with such a device for

frame.

  The invention is explained below in more detail, with the aid of drawings representing all of the various members making up the device for the presentation of the weft in front of a needle.

frame pass.

  Figure 1 shows a schematic view

  of the frame presentation set.

  Figure 2 shows the folding finger of

the frame and its order.

  Figure 3 shows the hook for placing the weft in the clip and in the notch

the counterblade of the cutter.

  Figure 4 shows the wire cutter assembly and

his order.

  The presentation device will be described according to the order of entry depending on the different

  bodies allowing the setting up of the frame.

  As described previously, the weft T is held taut between two nip points by the fabric a) on the one hand and by a tensioner b) on the other hand, the weft coming from the coil O) which is located outside tensioner b) Next to the tensioner b) and between the width a), a fixed eyelet d) in the case of one-line or a grommet d) mobile in the case of a weft mixer positions the frame always

  in the same place, as it is classic.

  The device according to the invention is located on the edge of the loom, between the fabric a and the eyelet,

fixed or mobile, d.

  On the passage of the weft T is a flap finger 1 which is controlled using a

  concave cam 2 and a lever 3 which is mounted

  by its end 3a on a trunnion 4 (FIG.

res 1 and 2).

  The lever 3 is provided with a roller 5 which is

  2 on the cam 2 under the action of a tension spring 6 hooked on the lever 3 on one side and the frame 7 of the other's loom The end 3b of the lever 3 carries a hinge 8 on which is mounted the lower part of the finger 1 of folding the weft The finger 1 itself carries a-slide 9 which engages on a rectangular guide 10, rotatable, which is held by an axis it integral with the

  The furrow finger 1 is at the top

  a beak 12 located on the path of the frame.

  During the downward movement of the finger 1, the beak 12 describes a slight movement towards the front of the machine (to the left in FIG. 2). The folding finger 1 is in action while the needle

  frame pass is at rest outside the width.

  During the insertion, the finger 1 is at rest, its

  spout 12 is positioned above the pass needle

  frame 13, in the position which is represented on

Figure 2.

  The cam 2 is rotated by a shaft 43 which rotates in synchronism with the shaft

  principal (not shown) of the art.

  All the R splitting set that comes

  to be described is therefore carried by the frame of the machine.

  only, independent of the leaf, and it is actuated

  positively by the cam 2 and not by the displacements

beating.

  Following the folding sequence of the frame which has just been described, a second member of the device, called "presentation hook" 14 (FIGS. 1 and 3), comes into action. This hook is disposed below the level of the trajectory of the weft needle 13 and the weft which has been lowered by the flap finger 1 is then

  in front of the hook 14, at the level of it.

  The curved end 14 has hook 14 drives

  the weft lowered by turning about an axis 16.

  During the rotation, the weft is slipped into a fixed gripper 27 composed of a lower blade, in

  arc-circle, 28 and an upper blade 29.

  Since the lowering of the frame by the finger 1, it rests on the lower pinch blade 28 and is held in this position during its placement in the clamp 27 by a

  trajectory of the hook 14a in an arc-circle

  below the blade 28, combined with a movement from the top downwards obtained by the inclination of the control pin 16 At the end of the stroke, the hook 14, 14 a is substantially perpendicular to the trajectory of the pass needle. frame 13, as shown

  in broken lines in Figure 1.

  The control of the hook 14 is also obtained

  Naked by a convex cam 17 A lever 18 mounted on an axis 19 at its end 18a carries at its other end 18b an axis 20 provided with a roller 21 which rests on the cam 17 Between the ends 18a, 18b of the lever 18 is hooked a spring 22 The other end of the spring 22 is fixed to the frame 7 under the traction of the spring 22 and through the lever 18,

  the roller 21 is applied against the cam 17

  linkage 23 carrying at each end a rotu-

  23 a and 23 b, is fixed at one end by the

  tule 23a on lever 18 between 18a and 18b.

  x end 23 b is connected to a crank 24, itself fitted on the control shaft 16; an inclined bearing 25, which is integral with the frame 7, maintains the control shaft 16 in position Said axis 16 is provided at its upper part with a nut 26 which is adjustable in rotation and longitudinally with respect to the control shaft 16 This nut 26 carries the hook 14 which is also adjustable in rotation. The precise function of the hook 14 is to take the weft stretched in its path and to guide it in the gripper 27 composed of the two gripping blades, lower 28 and upper 29, both

  blades having the shape of an arc-of-circle for

  The weft T being held in the F-shape of the fabric, the movement of the hook 14 guides it at the same time during its trajectory in a notch 40 belonging to the fixed knife 39 which will be

described in the following.

  The weft being in place in the clamp 27 and ready to be inserted, the weft needle starts its movement and takes the weft in passing, the clamp

  27 by the pinching force helps the weft to penetrate

  between the twig and the body of the weft, after placing the weft in the weft needle; the weft is immediately cut off by the

  knife, as will be referred to below, and

  thrown into the crowd by the needle 13.

  The cam 17, which controls the movement of

  and-coming presentation hook 14, is wedged on a shaft 43 'which rotates in synchronism with

the main tree of the craft.

  It is clear from the foregoing that all the members of this second set P of the device,

  that is to say the set of presentation and clamp-

  frame, are supported by the frame of the loom and that the movable members are positively controlled (by the cam 17), and not by the

movement of the wing.

  We will now describe the third set

  device C, which is the cut assembly of the frame and which is shown in detail on the

figure 4.

  This set includes a moving knife 37

  and a stationary blade-guard 39 (FIGS. 1 and 4).

  movable wheel 37 is also controlled by a cam like the two previous assemblies A lever 31 supports at one end a roller 32 Said lever is rotatably mounted on an axis 33 carried by the frame 7 between the ends 31a, 31b of the lever 31 is fixed an axis 34 bearing a hinge 35 with two branches On a branch 35 a of said hinge

  a spring 36 is fixed; the other end of the

  spell is hanging on the frame 7 The second branch

  b maintains the movable knife 37 by means of

  its stem 38 The counterblade 1 F, provided with the

che 40 is fixed to the frame 7.

  To achieve a good cut of the frame, the movable knife 37 is applied continuously against the fixed blade 39 by its oscillation joint 34 and by the action of the spring 36; this, through the articulation 35 of the axis 34 and the lever 31 maintains the roller 32 on the path of

the cam 30.

  At rest, the movable knife 37 is in the low position (FIG. 4) The weft retained in the notch 40 is cut between the upper edge of the notch and the cutting edge 41 of the movable knife 37

during the climb.

  The weft thus being presented on the path of the needle 13 and cut is inserted into the crowd by the needle while the three sets just described return to their positions.

  resting devices shown in Figures 2, 3, 4.

  After the return of the insertion needle,

  the inserted weft is packed by the comb, the end

  of the weft protruding from the edge of the fabric

  and retained in a fixed hook 42 (FIG.

  1 and 4), attached to the frame of the machine,

  to always be kept in the same place after

compaction.

  All the members of the third assembly of the device (cutting assembly of the frame) are also carried by the frame 7, the movements of the movable knife 37 being positively controlled by the cam 30 which is wedged on a rotating shaft 43 "

  in synchronism with the main tree of the trade.

  For the clarity of the drawings and for the

  of the description, it was assumed that the

  three cams 2, 17, 30 were independent, but it is obvious, since all these cams have their axes of rotation parallel, that, in practice, they are mounted side by side on a single common tree, which rotates in synchronism with the tree

  principal occupation, and that they enter

  in action, by their hollow or by their hump,

  in order * cam 2-cam 17-cam 30.

  Thanks to the fact that all moving parts

  of the device according to the invention are controlled po-

  sitatively by cams and are carried by the frame of the

  profession, it avoids the malfunctions of

  against high speeds with known devices that were worn and / or controlled by the

  beating and which were subject to inertial

  It was thus possible to increase

  the speed of the trades thus equipped.

  In the foregoing, the preferred embodiment of the invention has been indicated in which the three successive functions: folding of the

  frame; pinching and presentation; cutting of

  me, are realized by means of three sets

  contiguous, each having a single function.

  According to an alternative embodiment, the first two functions can be performed by a single assembly, namely that represented in FIG. 3. In this case, the curved portion 14 of the hook 14 is extended by an oblique part.

  ascending (substantially parallel to the upper

  S chain son in Figure 3) extending sufficiently upward to hook the weft T (Figure 1) which has not been, in this case, previously folded during the pivoting movement of the hook 14, the weft T slides along the oblique extension of the hook, which lowers it until it reaches the bent portion 14a of the hook

  14 which drives it into the clamp 27.

  The folding of the weft thus being effected

  killed by the hook 14 it is possible to delete

  the folding assembly shown in Figure 2.

  However, this variant does not make it possible to reach the highest speeds that are attained only when the trimming assembly

  of the frame shown in Figure 2 is present.

  This mechanism, thanks to its individual control

  dual cam, can fold the frame much faster than the hook 14, in the variant

which has just been described.

Claims (9)

  1 Device for presenting a weft in front of a needle of a loom, characterized in that it comprises at least one mechanism (R P) for folding, pinching and presenting in front of   the needle (13) of the portion of the weft (T)   between a guide eyelet (d) and the edge (a) of the fabric, comprising a cutting mechanism (C) at the end of the weft located near the edge (a) of the fabric, and in that each of said mechanisms is carried by a fixed part (7) of the frame of the loom and is actuated individually by a cam (2 17, 30) rotating in synchronism with the shaft main occupation.   Device according to Claim 1, characterized in that the folding mechanism,   narrowing and presentation of the weft is   killed by a first mechanism (R) for folding the   frame (T) and by a second pincer mechanism (P)   and in that each of said first and second mechanisms is carried by a fixed part (7) of the frame of the loom and is actuated individually by a cam (2-17).   carried by a shaft (43, 43 ') rotating in synchronism   with the main shaft of the loom, the cutting mechanism (C) constituting a third mechanism which is actuated by a third cam (30) carried by a shaft (43 ") rotating in synchronism with the main shaft. 3 Apparatus according to claim 2, characterized in that the first mechanism (R) comprises   take a flap finger (1), t which is mounted   substantially vertically smoothing in a guide (10) carried by the frame (7) of the loom and which is provided with a flap (12), and comprises a linkage linkage (3, 4, 8, 5) interposed between said finger (1) and the cam surface of the cam (2).   4 Device according to one of the claims   2 or 3, characterized in that the second mechanism   nism (P) comprises: a presentation hook (14) which is carried by an axis (16) pivotally mounted in a support (25) integral with the frame (7) of the loom and which   has a presentation spout (14a); a provision   stationary pinch (27) of the weft, which is   carried by the frame (7) of the trade and which extends beyond   above the arcuate trajectory of the hook (14); and a linkage linkage (18, 19, 21, 23, 24) interposed between said axis (16) and the surface cam follower (17).   Device according to Claim 4, characterized in that the axis (16) has an orientation   oblique to the vertical.   6 Device according to one of the claims   2 to 5, characterized in that the third mechanism   apparatus (C) comprises: a fixed counterblade (39) which is carried by the frame (7) of the loom and which has a notch (40) for retaining the weft; and an   linkage linkage (31, 32, 33, 35, 38) interpolated   between said movable knife (37) and the surface of cam of the cam (30).   Device according to Claim 6,   characterized in that the linkage linkage   tee comprises a spring (36) for applying the knife   movable (37) against the fixed counterblade (39) and   application of a roller (32) cam follower on the cam (30).   8 Device according to one of the claims   1 to 7, characterized in that it comprises a   fixed catch (42) of the packed weft, said hook being carried by a fixed part of the frame (7) of the loom and being located next to the edge (a) of the fabric.   9 Device according to one of the claims   2 to 8, characterized in that the three cams (2, 17, 30) are mounted side by side on a shaft   in synchronism with the main tree pal of the trade.   Weaving machine, characterized in that it is equipped with a device for presenting the   weft (T) in front of the needle (13) according to   conque of claims 1 to 9, said device   being carried by the frame (7> of the craft and being located   on the side of the loom, between a grommet (d)   ge of the frame and the edge (a) of the fabric.