FR2620652A1 - METHOD AND DEVICE FOR POSITIONING AND LACING A FLEXIBLE LINK ON A RIGID SUPPORT SUCH AS A CARDBOARD - Google Patents

Abstract

This method consists in: - bringing the flexible band (2) to the perforation (4a, 4b) on one side of the blank (4), - and passing the band (2) through the perforation by suction from the other side of the blank, the suction being maintained for the full length of the path travelled by the flexible band. The device comprises a work table (3) for taking the blank of board (4), means (1) situated beneath the blank of board (4) at the position of the perforation(s), and at least one suction system (45) arranged over the work table, at the position of each perforation (4a, 4b) in order by suction to draw the flexible band (2) through this perforation.

Description

METHOD AND DEVICE FOR POSITIONING AND LACING

  A FLEXIBLE LINK ON A RIGID SUPPORT SUCH AS A CARDBOARD

  The present invention relates to a method and device for positioning and lacing a flexible link on a rigid support such as a cardboard. This method is especially intended for the installation and fixing of the closure elastics on classification folders of the type consisting of at least two cardboard flaps, forming one the back and the other the flap of the shirt, the back being provided with an elastic fastened at its two ends at two distinct points of the outer face of the back and extending both on this outer face and on the inner face of the back in a broken line path, the passage, from one side to the other of the back of the shirt of this elastic band being made by means of two

holes in it.

  Currently, such folders are entirely made on automatic machines, apart from the

  laying and fixing elastics that are still performed manually.

  Indeed, this pose, and in particular the lacing, that is to say the passage of elastics in the holes from one side to the other of the back of the shirt, pose major technical problems, particularly with regard to the actual passage of the elastics in the holes as well

  their recovery after passage and their guidance to their point of fixation.

  tion. The object of the present invention is thus to remedy this drawback and to provide a method which, in a general way, makes it possible automatically to lacing a flexible link on a cardboard blank or the like, and more precisely, to pass, without having recourse to a manual assistance, a flexible link such as an elastic through

  perforation in a cardboard blank or similar and

  take this one and guide it according to a determined path.

  The object of the present invention is also to provide a

  device for carrying out this method.

  This object is achieved in that the method according to the invention

  - to bring the flexible link at the level of the perforation on one side of the blank; - and to pass it through the suction perforation

  of it through the perforation.

  This simple arrangement allows to cross the blank

  to an elastic without having to return or manipulate it.

  Advantageously also, the method of the invention consists in maintaining the suction on the flexible link all along the path traveled

by this one.

  The device for implementing this method comprises means for bringing the flexible link to the level of each perforation.

  it has to go through and ways to suck the link through the

drilling.

  In any case, the method and the device according to the invention will be better understood and other characteristics of these will be

  highlighted by the description which follows with reference to the

  attached schematic drawing, illustrating, by way of non-limiting example, a preferred embodiment of this device: - Figure I is a perspective view from the front, - Figure 2 is an enlarged scale, a sectional view 11-11 of Figure 1, - Figure 3 is an enlarged scale, a partial sectional view along 111-111 of Figure 1,

  - Figure 4 is, on an enlarged scale, a detail view in pers-

  perspective of the upper part of the device,

  - Figures 5 to 10 are schematic views illustrating the function

the device.

  As shown in FIG. 1, the device according to the invention essentially comprises a circular rotary ring I intended to bring the elastic thread 2, and a horizontal work table 3 fixed to a frame 3 a, disposed above the end upper crown I and intended to receive the file folders 4 to receive the elastic wire 2, these shirts 4 being provided with perforations 4a, 4b respectively for the passage of the elastic wire 2 by means of needles 31 and the fixing of this one. The ring 1 is rotated by means of an electric motor (60) (see Figure 1),

  who also commands, as will be seen below, the other

  mechanical effects of the device. The rotational movement of the neck

  circle 1 is controlled by an indexer positioning very

  the rotation stops of this ring, necessary to perform the various operations such as the cutting of the elastic thread and the passage of the lacing needles. As a result, the circumference of the crown is equivalent to three theoretical lengths of the elastic thread,

  and therefore the indexer itself controlled by the electric motor

  This causes the crown to move 120, then stops for a time allowing the above-mentioned mechanical movements to be executed, before executing a new displacement of 120. The elastic yarn 2 which has a flat section is unrolled in a manner known per se, from coils on which it is wound and is expanded using equipment maintaining a constant tension before entry

in the device.

  This elastic thread 2 thus relaxed is engaged in a peripheral groove la of the circular crown. As shown in Figure 3, this groove has a cross section shaped dovetail

  calibrated to the dimensions of the elastic thread 2.

  This circular ring I also has in three locations of its circumference pairs of leaf spring systems 5 for

  to retain portions 2a of the elastic thread in the groove la.

  As shown in FIG. 3, each spring blade 5 extends tangentially to the opening of the dovetail groove and is able to be moved perpendicularly to the plane of the crown.

  to open or close the opening of this groove.

  Each leaf-spring 5 is fixed to the end of a rod 6 mounted sliding transversely to the plane of the ring I and recalled, by means of a spring 6b, in the closed position of the groove

  the crown, that is to say to the left in Figure 3.

  At the end of each rod is mounted a roller 6a for cooperating with cam surfaces 7 for the opening of the groove 1a. The cam surfaces 7 are fixed on the frame 3a of the device, at three locations A, B, C thereof distant from each other by about

  (see Figure 2).

  They have projecting parts 7a intended to cause the removal of one or both rollers 6a of each pair of leaf springs, so as to cause the opening of the groove 1a at the lameressort in question. Each of these parts 7a is preceded by a

  ramp 7b facilitating the engagement of the roller or rollers 6a.

  At the location A, that is to say at the engagement of the elastic thread 2 in the ring 1, the cam surface 7 is designed to cause the momentary opening of the groove la by opening

  of the two leaf springs 5, in order to allow the introduction of the elastic yarn

  than, then closing this groove to avoid a release of this elastic thread. At the location B, the cam surface 7 is designed to open only the left-most leaf spring blade 5

  in Figure 2, the other leaf spring remaining closed.

  At the bottom of the device is a knife 8

  intended to cut the elastic thread 2 engaged in the throat of the neck.

  1. The movement of this knife 8 is effected by means of a

  rod system 9 in a substantially perpendicular arc of a circle

  the plane of the crown I (see Figure 3) and is controlled by the general driving motor of the crown 1, as will be seen

further.

  As shown in FIG. 2, the elastic thread 2 is introduced into the open groove 1a of the ring at level A of the device and is held therein by closing the two leaf springs (see above). When the two leaf springs 5 arrive at the level of the knife 8, during the subsequent rotation of the ring 1, the ring 1 moves substantially horizontally as indicated above and cuts the elastic thread held between the two leaf springs 5. This one is cut into portions 2a, each end of which is maintained

by a spring blade 5.

  The work table 3 has, in its central part, an opening 13 into which penetrates the upper part of the circular crown la. This work table 3 also has two lugs

  14 capable of engaging in perforations of the

  placed in cardboard 4 to be provided with elastics. As will be seen below, these centering pins 14 are able to retract and are

controlled by cylinders 14a.

  On the work table 3 are also provided two other pre-centering stops 15 non-retractable. A presser 17 is disposed above this work table, in order to press the cardboard sleeve 4 against it. As shown in FIG. 3, this presser 17 is pivotally mounted in its middle part 17a and is urged at its rear end by a jack 18. This jack 18 serves to turn the presser 17 clockwise in order to shirt 4 on the table

  3 by its end 17b opposite the cylinder 18.

  A return spring 19 makes it possible to turn the presser 17 in the opposite direction, ie to raise its end 17b, in order to

release the shirt 4.

  A pressing system is also provided inside the circular ring I. This pressing system is constituted by a strip 20 adapted to be moved upwards by means of an electromagnet 0 21, so as to press against the work table 3 the elastic thread

  2 under it, in opposition with the presser 17.

  Inside the circular crown is also mounted

  a system 30 for threading the elastic thread into the holes of the

  4. This system 30 consists of two parallel needles 31 each

  vertically movable and guided in guides.

  Each of these needles is made using a system

  of rods 32 controlled in a manner known per se by the driving motor.

  of crown I (see Figures 2 and 3). The movements of the needles 31, as well as those of the knife 8, are transmitted to the systems

  driving them from the engine by electric clutches.

  tromechanical devices such as those of the type known under the trade name

  ciale WARNER, so as to ensure a very precise movement of these various elements during the exact duration of stop rotation of the crown. On the other hand, safety cams (not shown in the drawing) electrically control the relative positions of the various

  parts to prevent rotation of the crown if one of the mechanical parts

  This is an obstacle to this rotation.

  Above the working table 3, are also arranged two carriages 40 able to move each in a horizontal plane along an oblique line. Each of these carriages 40 is slidably mounted along two horizontal pins 41 and is moved along them.

  by means of a jack 42 (see Figure 3).

  Each of the carriages 40 carries a vertical suction tube and a needle 46 movable vertically by means of a jack

47.

  In a first position of the carriages 40, the suction tubes thereof are aligned above the needles 30 of the circular crown I and the perforations 4a of the cardboard sleeve 4 (position

in full lines in Figure 2).

  In a second position of the carriages 40, the needles 47 of these are found vertically perforations 4b formed in

  the cardboard shirt 4 (position in phantom in Figure 2).

  Each carriage also comprises at its lower part a leaf spring 50 extending under the needle 46 of this carriage and intended, as will be seen later, to apply the elastic thread 2 against the

  shirt 4, for the duration of the movement of this trolley 40.

  Each leaf spring 50 has in its middle part a recess a to allow the passage of the needle 46 associated with its lowering. The operation of the device according to the invention is as follows. The elastic thread 2 is fed into the groove 1a of the circular ring 1 and is cut into sections 2a by the knife 8 as the circular ring 1 is rotated. The two ends that have just been cut are each time held in place

  in the groove 1a by the leaf springs 5 at the neck

water 8 (see figure 5).

  Each section 2a of elastic thread is thus held in place at each of its ends by a leaf spring 5. It is brought, at

  as the circular ring 1 is rotated, in the position

  tion B shown in Figure 6. In this position the middle part

  a stretch of elastic thread 2a is just below the perforations

  rations 4a in the sleeve 4 and the needles 31 begin to rise. In this position, the elastic 2a is held pressed against the underside of the liner 4 by the pressing system 20 as explained above. Simultaneously, the ends of this elastic thread are released by the corresponding leaf springs 5, and the elastic thread

  is therefore retained only by the slat 20.

  Similarly, the cardboard sleeve 4 which is positioned by means of the positioning pins 14 passed through the perforations 4 thereof, as well as by the centering stops 15, is locked against the worktable by the presser 17, the positioning pins engaged

  in the perforations 4, then being retracted (see Figure 6).

  At this moment, the two needles 31 are moved towards the

  high and engaged in the perforations 4a, so as to pass the

  Moved the section la of elastic thread through its perforations 4a.

  Simultaneously with this passage, the ends of the section la are sucked by the suction tubes 45 arranged in the alignment of the needles 31 (see Figure 7). The two needles 31 then descend again as well as the pressing system 20. At this moment, the portion of elastic thread 2a is completely released from the circular ring I. Of course, it continues to rotate to bring

  above the needles 31 another portion of elastic thread.

  Both ends of wire 2a, engaged in the tubes of

  45, are maintained therein by the vacuum created therein.

  The two carriages 40 then move obliquely under the effect of their respective cylinders 42, to bring the suction tubes 45 of the

  perforations 4a to perforations 4b (See Figure 8).

  The displacement of each of these carriages 40 is carried out so that the suction tube 45 associated with this carriage is slightly beyond the perforation 4b and the associated needle 46

  is found in the alignment of this one.

  Of course, during the entire movement of the carriages 40, the suction is maintained in the tubes 45, so as to maintain the

  ends of the elastic thread in these.

  Furthermore, the leaf springs 50 apply the elastic thread against the work table 3 throughout the movement thereof, the perforations 4a to the perforations 4b, and therefore ensure

  perfect flat of this elastic thread without any twisting of it.

  Once the carriages in the position shown in Figure 8, the needles 46 thereof descend into the perforations 4b associated by passing the end of the elastic wire through them (Cf.figure

9).

  The needles 46 are then raised and there is no longer then

  than to fix each of the ends of the elastic thread 2 at the level of the

  Forbits 4b, by any known means such as riveting.

  The device according to the invention therefore makes it possible to automatically switch

  tically a flexible link such as an elastic thread through the perforations

  of a cardboard or similar shirt, as well as to take up this elastic thread.

  tick after passing through the perforations and guide it according to a determined path. The device according to the invention can therefore be used to carry out any kind of lacing or counter-lacing on a rigid and flat material

such as cardboard sheet.

  It goes without saying that the present invention is not limited to the single embodiment shown above by way of non-limiting example, but encompasses all the embodiments,

  implementing similar or equivalent means.

Claims (11)

Claims 1 - Method for positioning and lacing a flexible link (2) such as an elastic band through a perforation (4a, 4b) of a rigid support such as a cardboard blank (4), characterized in that what it consists: - to bring the flexible link (2) to the level of the perforation (4a, 4b) on one side of the blank (4), and to pass it through the suction perforation by the other side of the blank.   2 - Process according to claim 1, characterized in that it consists in maintaining the suction on the flexible link all along the path traveled by it.   3 - Device for implementing the method according to one   claims I or 2, characterized in that it comprises a table   of the work (3) for receiving the cardboard blank (4), means (1) located below the work table (3) for bringing the flexible link (2) below the cardboard blank (4). ) at or at the perforation, and at least one suction system (45) disposed above the work table, at each perforation (4a, 4b) to suck the   flexible link (2) through this perforation.   4 - Device according to claim 3, characterized in that - each suction system is constituted by a vertical tube (45) inside which is created a depression and in that this tube is mounted on a carriage (40) able to move according to a corresponding path to that of the flexible link (2).   5 - Device according to claim 4, characterized in that the suction is maintained in each tube (45) along the path flexible link (2).   6 - Device according to claim 4 or 5, characterized in that each tube (45) is provided with a spring (50) adapted to press the flexible link (2) flat against the work table (3) throughout of the journey of it.   7 - Device according to any one of claims 3 to   6, characterized in that a vertically displaceable needle (31, 46) is associated with each perforation (4a, 4b) for passing   the flexible link (2) through it.   8 - Device according to claim 7, characterized in that the lameressort (50) is provided with a recess (50a) for the passage of the associated needle (46).   9 - Device according to any one of claims 3 to   8, characterized in that the flexible link (2) is brought to the level of the work table (3) by a rotary ring (1) provided with a groove (la) for the accommodation of this link and in that the link is maintained inside the groove (la) by means of a leaf spring (5) closing the opening of this groove (la) and whose movement is controlled by a cam system (5, 6, 7).   - Device according to claim 9, characterized in that the flexible link (2) is cut into sections (2a) by a knife (8) as and when it is introduced into the crown (1) and in that each section is kept in the throat (la) of the crown by   leaf springs (5) acting on each of its ends.   11 - Device according to any one of claims 9   and 10, characterized in that the ends of the flexible link (2a) are released   by the leaf springs just before it passes through the perforations (4a).   12 - Device according to claim 11, characterized in that there is provided inside the ring (1) a pressing system (20) for applying the flexible link (2a) against the blank (14), after   release of the ends thereof by the leaf springs (5).   13 - Device according to claim 12, characterized in that it comprises a pressing system (17) intended to press the blank (4) against the work table (3).