FR2617873A1 - IMPROVEMENT TO THE MACHINES FOR MAKING THE SEWING OF TWO KNITTED PANELS HAVING A SIDE EDGE AND A LONG JERSEY - Google Patents

Abstract

Device for guiding and unwinding selvedges for sewing panels knitted on sewing machines with cups. It comprises two slides 18, 19 spaced apart and a separator blade 20 capable of being placed in the center of the slides for sewing the jersey and of being raised out of the slides for sewing the ribbed edges. Two unwinder shoes 30, 31 located respectively to the right and to the left of the separator blade 20 unwind the selvages of the jersey and are spaced apart for sewing the ribbed edges. It also comprises two plates 24, 25 of thickness substantially equal to that of the sewing jersey, placed between the separator blade 20 and each of the shoes 30, 31 and whose lower part has a rounded profile located at a certain distance above. slides, thus perfectly delimiting the space available for the edges of the knit panels.

Description

26 17873

  IMPROVEMENT TO MACHINES FOR PERFORMING

  THE SEWING OF TWO KNITTED PANELS HAVING AN EDGE

COTE AND A LONG IN JERSEY

  The present invention relates to an improvement made to the

  sewing machines, making it possible to sew knitted panels

  trant in the realization of clothes such as pullovers, skirts ...

  It relates more particularly to an improvement brought

  cuvette-type sewing machines used to make the assembly

  knitted panels of the "fully-fashioned" type and which, in a

  generally, have a ribbed edge extended by a jersey part, perfected

  which not only facilitates the use of such

  machines and to increase the yield but also ensures a better

  their finishing finished articles.

  In the remainder of the description, the improvement according to

  the invention will be described in the case of the realization of panels intended to form a pullover but it is obvious that this is not limiting and that such a type of machine could be used to make any other

type of clothing.

  To date, to realize the assembly by sewing knitted panels

  of the "fully fashioned" type intended to form pullovers, and all

  for the assembly of the front and back panels, and the closing of

  In the sleeves, a special sewing machine called "cuvettes" is used.

  These panels generally comprise a knitted rib, said side edge, the belt and wrists, and a knitted part in jersey along the body and arms. Since the edge of the jersey part tends to roll, the sewing machines with bowls are generally equipped with a system for unwinding and guiding the edges of the jersey, essentially consisting of a separator (thin vertical plate) associated with two shoes arranged on either side of said separator. ensuring the unwinding and setting up of selvedges and equipped with two

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  Nipples crossing the hooves and lowering the hips to a constant height. This unwinding system, which should work only in the jersey part, is generally retracted during the seaming of the rib edges and is put in place when the transition zone between edge and jersey

  arrives at the entrance of the sewing machine.

  To date, the implementation of such machines is essentially

  manual and therefore requires highly trained staff.

  It has been proposed for a long time to automate the realization of such seams, as is apparent in particular French patents

2,202,520 and 2,247,101.

  Although in a general way, the solution subject of the aforementioned patents is satisfactory, it must however be noted that it leads to a very complex set, difficult to implement and more cumbersome. It has also been proposed to simplify the use of cuvette sewing machines by providing them with: - a guiding slide consisting of two coplanar plates

  between which there is a slot of approximately

  equal to the thickness of the sewing set - a gripping device for the end of the sewing boards,

and power on.

  This set indeed makes it easier to sew the knitted panels on a bowl machine, but only partially answers the problem posed. Indeed, the peeling head associated with the slide is of conventional design and comprises - a thin vertical separating blade, separating the two jersey panels. it enters the slide only during the seaming of the jersey \ and is raised during the sewing of the edge

  - two unwinding sabots located on both sides of the separated blade

2 6 1 7 8 7 3

  -3 - Roving, moving around a horizontal axis and squeezing each jersey panel against this blade by means of a return spring. These hooves are open quite widely during the seam of the edge side to not be in contact with him and must be brought into contact with the article from the end of the side edge and the beginning of the jersey. Simple mechanical means

  can control the opening of the hooves from the movement of rele-

the separating blade.

  - two fixed constellations, perpendicular to the separating plate. They pass through the hooves through a hole with sufficient clearance to allow the

  adjustment of the nipples in height and the opening of the hooves - without friction.

  The end of the nipples is in contact with the separating blade.

  This unwinding assembly has a number of disadvantages - the pressure of the springs hooves creates a significant friction between the jersey panels on the one hand and the hooves and the splitter blade on the other. This friction must be overcome by a large traction of the bowls which lengthens the jersey, amplifies any differences in the length of the panels and interferes with the unwinding - the important play which exists in the hole of the hooves, around the

  nons, adds to the effects described above by creating a zone of disconti-

  creative ness of additional friction - the fixed nipples are an obstacle when sewing the edge edges Gold, it has been found, and this is the subject of the present invention, an improvement in the unwinding devices associated with sewing machines cups, which solves these problems by decreasing

  noticeably the friction of the knit in the unwinding head and

  In general, the invention therefore relates to a guiding and diverting device for a bowl machine for sewing two knitted panels comprising a long jersey possibly preceded by a side edge. device presenting, upstream of the sewing head

  as such, two coplanar guide rails (plates)

  is adjustable and a peeling assembly located above

2 6 1 7 8 7 3

  - 4-slide and itself consituté a separating blade and two undoing hooves, the device being characterized in that it comprises two deflection plates located between the separating blade and the unwrapping shoes, pads whose thickness is adjacent to the thickness of the jersey knit and whose lower part has a generally rounded contour whose lowest part is located at a distance from the adjustable slides depending on the desired seam fineness, plates that are raised

  at the same time as the separating blade when sewing rib edges.

  Thanks to such a peeling device, it is possible to sew the rib edges without any obstacle and to sew the jersey parts with a minimum of tension, because the friction between the knitting on the one hand, the

  hooves and the separating blade on the other hand, is limited to the strict minimum.

  The invention and the advantages it brings are however better understood thanks to the embodiment given hereinafter by way of indication but not limitation, and which is illustrated by the appended diagrams, in which: FIGS. 1 to 4 are schematic views of a guiding and unwinding device made with known means; Figures I and 2 show it open for the seaming of the rib edges, respectively in section (Figure 1) and in profile (Figure 2). Figures 3 and 4 show it closed for unwinding and sewing the jersey, respectively in section (Figure 3) and in profile (Figure 4) - Figures 5 to 8 are schematic views of a corresponding unwinding device to the invention. Figures 5 and 6 show open for the seam of a side edge, respectively of face (Fig. 5) and profile

  (Fig 6). Figures 7 and 8 show it closed for peeling and cutting.

  jersey, respectively front (fig 7) and profile (fig 8).

  Figures I and 2 show a known device for guiding and unwinding in the open position for sewing the side edge. the two slides (1) and (2) provide a slot (3) guiding the two joined rib edges (10) and (11) to the bowls (12) of the sewing machine. The two shoes (4) and (5) are spaced at their base and are traversed by the pins (6) and (7) which are fixed and whose ends is a contact with the blade

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  Separator (8), itself raised. Unrepresented means connect the

  blade lifting movement (8) at the opening of the shoes (4) and (5).

  Figures (3) and (4) show the same known device in closed position during unwinding and sewing of a jersey area. For this, the separating blade (S) is lowered into the slot (3) halfway between the two slides (1) and (2) and a mechanical device (not shown) simultaneously allows the closing of the shoes (4) and (5). which have come closer - us the action of the spring (9) until come compress the two edges of jersey (13) and (14) against the blade (8). In this position, the bowls (12) rotate and ensure the advancement of the knit throughout the device, the ramps (15) at the back of the shoes (4) and (5) unwind the edge of the jersey that slides flat between the hooves and the blade (8). The selvedges are obliged to descend under the nipples (6) and (7) whose position exactly determines the height of entry into the cuvettes (12) and therefore

the sewing height.

  Note that in this known device, a fine seam in the jersey would require a low height "h" which may create an obstacle when passing the edge and the seam will necessarily

  higher in the jersey than in the ribbing.

  Moreover, the action of the spring (9) creates a pressure and therefore a significant friction between the shoes (4) and (5), the blade (8) and the selvedges

  (13) and (14), this friction is further increased by the presence of a discon-

  tinuity in the form of the hole created in the shoes (4) and (5) for the passage of the nipples (6) and (7) just where the pressure in the jersey

is the strongest.

  Figures 5 and 6 schematically show a device, realized

  according to the invention, in the open position for sewing a side edge.

  Figure 5 is a front view, Figure 6 is a side view.

  This device comprises, in known manner, two slides (18) and (19)

2 6 1 7 8 7 3

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  6 guiding to the cuvettes (35), a separating blade (20) which is pivotable about an axis (27) for example by means of a jack (26) and two unwinding shoes (30) and (31) , movable about horizontal axes respectively (32) and (33) and recalled by a spring (34). The mechanical connection for moving the shoes (30) and (31) apart when the blade (20) rises, comprises two oblique wedges (21) and (22) integral with the blade (20) which separate

  two rollers (28) and (29) respectively integral with the shoes' (30) and (31).

  According to the invention, the two shoes (30) and (31) are not traversed by pins and have no orifice for this purpose. Two deflection plates (24) and (25) whose thickness is substantially equal to or slightly greater than the thickness of the sewing jersey are integral with

  the blade (20) and pivot with it about the axis (27).

  We note that in this open position the passage is perfect.

  cleared for the side edge that can be correctly guided between the blades (18) and (19) to the bowls (35) of the sewing machine

  thanks in particular to the absence of nipples.

  Figures 7 and 8 relate to the merfe device according to the invention

  represented this time in closed position.

  Figure 7 is a front view. Figure 8 is a side view.

  At the moment when the end of the side edge has passed at the level of the unwinding shoes, the jack (26) has commanded the simultaneous descent of the separating blade (20) between the slides (18) and (19) and of the two deflection plates ( 24) and (25) at an adjustable distance h 'above the slideways as well as the two corners (21) and (22) which allowed the closing of

hoofs.

  Unlike the known devices represented in the figurel

  3 and 4, the hooves are no longer pressed directly against the jersey may.

  are based on the plates (24) and (25) whose thickness is substantially equal to or slightly greater than that of the sewing

  so slip with low friction in the device.

  In case, however, a thickening occurs, it can raise the hooves to clear a passage and the spring (34) would then fully resume its action. If this extra thickness is a non-resorbed roll, the increased pressure on the stock will quickly absorb it

  return to the previous situation with low friction.

  It is noted that by adjusting the stroke of the cylinder it is possible to regulate independently

  the low and high possi- bilities of the deflection plates, that is to say, to be as small as one wants (fig 7) without disturbing the rib edges in

open position (Fig. 5).

  The profile of the corners (21) and (22) and their position is designed to synchronize

  perfect the descent of the blade and the closing of the hooves so

  to avoid any loss of time and dissymmetry in the movement.

  It is easy to conceive that the control of the jack can be automatic, for example by means of a photocell detecting the arrival

  side edge downstream of the device and located at a distance slightly lower than

  greater than the length of the coast.

  It is also conceivable that the deflection plates can be integral with the shoes (instead of the separating blade) and move away with them to leave the field free at the seam of the side edge and without leaving

of the scope of the present invention.

Claims (7)

  1 / Device for guiding and unrolling selvedges for sewing knitted panels on cuvette sewing machines, comprising: - two slides (18, 19) spaced by a width substantially equal to the thickness of the panels to be assembled - a blade separator (20) capable of being placed in the center of the slides for sewing the jersey and to be raised out of the slides for sewing the rib edges - two undoing shoes (30,31) located respectively to the right and left of the blade separator (20) and capable of being brought into contact with the knit for unwinding the edges of the jersey and spaced apart for seaming the rib edges, characterized in that it comprises two plates (24) (25) of thickness   substantially equal to that of the sewing jersey, placed between the separate blade   matrix (20) and each of the shoes (30,31) and whose lower part has a rounded profile located at a distance above the slides,   thus perfectly delineating the space available for the edges of knit nests.   2 / Apparatus according to claim I characterized in that the plates (24) (25) placed between the separating blade (20) and the shoe (30) (31) are integral with the separating blade and are raised with it to sewing ribs.   3 / Apparatus according to claim 2 characterized in that   the low position of the pads (24) (25) is adjustable to adjust the fines. sewing.   4 / Apparatus according to claim 1 characterized in that the plates (24) (25) placed between the separating blade (20) and the sabc (30) (31) are integral with the hooves and can move with them for rib stitching.   5 / Apparatus according to claim 4 characterized in that 26 1 7873   9 - the position of the plates (24) (25) is adjustable in height   6 / Apparatus according to any one of claims I to 5 and carac-   characterized by the fact that a mechanical device (21) (22) synchronizes the movements   Ja splitter (20) and claw opening (30) (31)   7 / Device according to claim 6 characterized in that the mechanical device (21) (22) opening and closing is controlled   automatically for example by means of a photocell.