FR2517627A1 - DEVICE FOR THREADING VALVE BAGS ONTO (OR EACH) FILLING CANNULA OF A BAGGING MACHINE - Google Patents

Abstract

A DEVICE FOR THREADING VALVE BAGS ON THE (OR EACH) FILLING CANNULA 21 OF A BAGGING MACHINE 17 INCLUDES A DEVICE FOR TAKING THE BAGS ONE BY ONE FROM A BAG OR A COIL AND A DEVICE FOR OPENING THE VALVE, THIS LATTER BEING LOCATED AT THE LEVEL OF THE CANNULA. ACCORDING TO THE INVENTION OF THE GUIDING SHEETS, IT CONTAINS NOW THE BOTTOM OF THE BAG 1 WHICH IS EQUIPPED WITH THE VALVE IN THE OPENING POSITION OF THE SAME, WHOSE LONGITUDINAL AXIS, PARALLEL TO THAT OF THE BOTTOM OF THE BAG, CAN BE TAKEN IN ALIGNMENT OF THE LONGITUDINAL MEDIAN AXIS OF THE CANNULA. THIS BOTTOM OF THE BAG CAN BE THREADED ON THE CANNULA BY MEANS OF A CONVEYOR 2 AND, DURING THIS OPERATION, IT IS GUIDED IN PROFILED SHEETS, WHICH, ONCE THE OPERATION IS COMPLETED, PIVOT OUT OF THE TRAJECTORY OF THE BAG. APPLICATIONS: BAGGING PLANTS.

Description

The present invention relates to a device for threading shopping bags.

  empty valve on the (or each) filling cannula of a bagging machine, comprising a

  device for picking up the bags one by one in a lias-

  se or a coil and a device to open the valve,

  the latter being located at the level of the cannula.

  Bags intended to be presented to cannulas of bagging machines are gripped by clamps of a

  valve opening device and threaded on the ca-

  When the bagging machines are rotating, the direction in which the bags are transported in the

  valve opening device is tangent to the ma-

  china, so that the clamps located thereon must execute a controlled movement A relatively expensive mechanism is therefore necessary for the control of the clamps A clamp is also required for each cannula, so that the

  device for threading the bags is of a com-

plex and relatively expensive.

  The object of the invention is therefore to provide a

  sitive of the same type, which, while being of compact construction, can be used on bagging machines both rotary and straight, and can operate at

  high rates, with relatively simple kinematics.

  To this end, in the device according to the invention, guide plates hold the bottom of the bag which is

  fitted with a valve in the open position thereof

  ci, whose longitudinal axis, parallel to the longitudinal direction of the bag bottom, can be brought into alignment with the median longitudinal axis of the cannula, the bag bottom can be threaded onto the cannula by means of a conveyor and, during this operation, is guided in profiled sheets, which,

  once the operation is completed, pivot out of the path

bag roof.

  The device according to the invention can be used

  on any bagging machine, both rotary and rectili-

  gne During the threading operation, which takes place in three

  tapes, the bag to be filled only performs one movement

  straight, the valve being held in the open position

  ture by guide sheets and profiled sheets, which guarantees high operational safety It is

  particularly advantageous that the three stages of the operation

  ration: one by one sampling of the bags with valve opening, transport to the cannula in the standby position and the actual threading of the bag take place

  at the same time, as this results in a high yield of the dis-

  positive. It is particularly advantageous that the sheets

  can pivot around a common axis located above

  above the horizontal plane containing the longitudinal axis me-

  dian of the cannula because, in a fixed rectilinear machine, the threading device can, during the filling of the bag mounted on the previous cannula, move to the

  next cannula and, in a rotary machine, the bag inserted

  It can, without inconvenience, move a "notch" with

his cannula.

  A particularly simple construction is obtained

  and particularly safe operation when the con-

  voyeur is formed by an endless belt running through a-

  successive vancings and by associated pressure rollers

  attached to the upper end of the belt.

  If necessary, when transporting the bags, they can be easily repaired when the pressure rollers are mounted free to rotate on a movable beam.

  using a cylinder, because the rollers can then be

  belt covers, which allows, for example,

  easily see a bag possibly trapped between this

last and the rollers.

  We can, in a simple way, make the device according to usable indifferently on a rotary machine or on a rectilinear machine by realizing it in the form of an independent functional unit, mounted on a common support. There is no need to adjust the pressure rollers for different thickness of bags when the beam carrying them is elastically mounted on the support The transfer of individual bags to the conveyor is carried out

  in perfect conditions when rollers trans-

  carriers capable of performing a pivoting movement, which

  weave the bags below the bottom by adhesion, are arranged on the entry side of the conveyor. In a preferred embodiment for a rotary bagging machine provided with cannulas which rotate around

  of a vertical axis, the device according to the invention is mon-

  tee so that it can pivot around a vertical axis.

  In this embodiment, the movement of the cannulas of

  the rotary bagging machine and that of the device,

  During the threading of a bag on one of the cannulas, are synchro-

  so that the bag to be filled can be threaded very precisely The device can also be stopped

  and place the bags by hand on the cannulas.

  Synchronization between the movement of the cannulas and that of the device is obtained in a very simple manner by providing each cannula with a driving member, by placing

  on the trajectory of this organ a lever and, for the

  the age of; S&CE, by rotating the device according to 1 l

  invention on the aforementioned axis of an angle determined by the co-

  operation between the driving member and the lever It is a-

  when particularly advantageous that the lever can be moved by means of a jack In the case where there is no bag to be put on, it is thus possible to bring the lever into a position where it does not cause the pivoting of the device. In any case, the invention will be well understood on

  using the following description, with reference to the drawing

  schematic annexed, representing $, by way of non-binding example

  mitative, an embodiment of this device: Fig 1 is a highly diagrammatic top view

  of the device according to the invention associated with a machine for

  rotary bagging; Fig 2 is an elevational view of the bag removal device; Fig 3 is a partial elevation view showing

  the part of the threading device facing the pipes

  the; Fig 4 is another partial elevational view, which shows the profiled sheets; Fig 5 is an elevational view of the conveyor, the

  pressure rollers being raised.

  As shown in Figure 1, the threading device

  empty bags 1 comprises a conveyor 2, consisting of

  an endless toothed belt 5, passed around two wheels

  return water 3 and 4 and driven by a motor 6, as well as by pressure rollers 8 mounted free in rotation

  on a beam 7 This is mounted movable under the ef-

  spring of springs 39 on a support 9, on which is articulated

  slow, on the entry side of the conveyor, rollers

  carriers 11, to which a jack 10 causes movement

  pivoting on the support 9, are further mounted, in the extension of the conveyor 2, profiled sheets 13, 14 able to pivot on a horizontal axis 12 and jacks 15, 16, which act on these sheets At the end of the device

  facing a rotary bagging machine 17, is available

  a lever 20, which pivots about a vertical axis 19 under the action of a jack 18 The bagging machine 17 is provided with a plurality of filling cannulas 21, uniformly distributed over its periphery Two triggers 25, 26, which cooperate with a control tongue 27, are fixed by means of a fastener 24 to the support 9 A roller 23, which serves as a driving member, is fixed by means of a tab 22

  to the bagging machine 17, above each cannula 21.

  At the end of the conveyor 2, on the outlet side, is arranged in

  in addition to a photocell 28 Above the canu-

  the 21 is also fixed on the machine 17 a switch to

  pusher 29 serving as a feeler and a jack 30, for immobilizing

  read the bag threaded on the cannula 21.

  FIG. 2 illustrates how a bag is removed and brought to the device according to the invention. Two squeegees 31, 32, mounted on rods not shown, are posed on the bottoms 33, 34, turned upwards, of the bag 1 and

  lift it towards the threading device.

  The bottom 34 is provided with a filling valve 35 The squeegee 32 can be brought by control means not shown in a position 32 ′, in which it is located above the conveyor 2 By this movement of the squeegee

  32, the bag 1 is pulled against a tension tube 36 placed above

  above him The valve 35, which then opens, is then

  maintained by guide plates 37, 38, which, after pivoting, are applied against the bottom 34 and have a shape which corresponds to that of the open bottom The sheet 37 is fixed, while the sheet 38 can pivot By reversing the direction of

  air circulation at the squeegees 31, 32, the latter liberating

  rent the bag By sending pressurized fluid to the jack, the transport rollers 11 are lowered on the belt 5 of the conveyor 2 and, as soon as the motor 6 is started by a signal from a cannula 21, the

  empty bag i is transported towards the packaging machine

  rotary chage 17 As further shown in FIG. 2, each pressure roller 8 is applied by a spring 39 against the toothed belt 5 This elastic suspension allows each roller 8 to move according to the double arrow A. We can see in the figure 5 that the rollers 8 mounted

  on the beam 7 can, by actuating a jack 40, ê-

  be moved along the double arrow B, so that

  can also move them away from the belt 5 of the conveyor 2.

  The support 9, which carries the threading device, is suspended from a fixed bearing 42 by means of a vertical axis 41 A return spring 43, hooked on the one hand to the bearing

  42 and, on the other, to the support 9, pulls the insertion device

beam against a fixed stop 44.

  The bagging machine 17, which rotates in the direction of arrow C, is provided with several cannulas 21 As soon as

  the tongue 27 passes in front of the trigger 25, the latter

  puts a signal which actuates the cylinders 15, 16 in the direction of closing of the profiled sheets 13, 14 At the same time, the lever 20 is brought into the position shown in the

  figure 1 As soon as the tongue 27 passes in front of the trigger

  cheur 26, this emits a signal which starts the mo-

  teur 6 The bag 1 which is in the standby position (fig. 31 is then threaded onto the cannula 1, while at the same time a bag held by the guide plates 37, 38 is brought into the waiting and at the same time a bag is taken up by the squeegees 31, 32 and transferred to the sheets 37, 38 The guide sheet 38 is brought by pivoting into the position 38 shown in phantom in Figure 2

  so that the squeegee 32 can pass The roller 23 rolls

  be the lever 20 which has pivoted outwards, so that the entire threading device is, by pivoting

  around the vertical axis 41, brought into the position shown

  felt in broken lines in Figure 1, the bag 1 being simultaneously threaded on the cannula 21 As can be seen

  in FIG. 1, the threading of a bag 1 onto a cannula 21 is effected

  takes place during the rotation of the machine 17, rotation which

  is synchronized with the pivoting of the threading device

  ge Before the machine 17, continuing to rotate, é-

  card the roller 23 of the lever 20, an inversion of the movement of the jacks 15, 16 rotates the profiled sheets 13, 14 around the axis 12, so that they do not interfere with the movement of the bag as soon as the roller 23 has stopped rolling on the lever 20, the return spring 43 brings the threading device against the stop 44 The elastic nature of the latter prevents too sudden a shock and eliminates the risk

rebound.

  A rod switch 45 associated with each cannula

  feel the threaded bag and emit a signal to actuate the

  rin 30 to immobilize the bag to be filled on the cannula.

  When the bag is correctly threaded, the refilling operation

  pleating is triggered by push-button switch 29.

  When a bag, empty or full, is still on the cannula 21, the triggers 25, 26 are not covered

  by the tongue 27 Therefore, the lever 20, under the ac-

  tion of the jack 18, pivots so that the roller 23 cannot

  roll on it In addition, the motor 6 is not started

  che, so that the process of threading the bag on the cam

nule is not triggered.

  As can be seen in particular in FIG. 3, the distance between the cannula 21 and the outlet end of the conveyor 2 must be chosen so that the bag 1 can be brought by the latter into the position necessary for

  its filling This is made possible by the flexibility

  bags, although during the egg-thinning, by cooking the pivo-

  of the devices the negated valve is not in 1 '

cannula alignment.

  In the embodiment shown, the device

  threading has been described in relation to a machine for

  rotary bagging When combined with a rec-

  the 3-year-old child is moved from a cannula

  to the other instead of turning 3-Ji 'the axis 41.

Claims (16)

CLAIMS -   1. Device for threading valve bags to   fill on the (or each) filling cannula of a ma-   bagging china, comprising a device for removing the bags one by one from a bundle or a coil and a device for opening the valve, the latter being located at the level of the cannula, characterized in that it includes sheets guide (37,38) holding the bottom (34) of the bag   which is provided with the valve (35) in the open position   re thereof, whose longitudinal axis parallel to the direction   longitudinal of the bottom (34) of the bag, can be brought into the a-   alignment of the median longitudinal axis of the cannula (21),   in that the bottom (34) of the bag can be slid over the canu-   the (21) by means of a conveyor (2) and, during this operation, is guided in profiled sheets (13,14), which,   once the operation is completed, pivot out of the path bag roof (1).   2. Device according to claim 1, charac-   in that the profiled sheets (13,14) can pivot   around a common axis (12) located above the horizontal plane-   tal containing the median longitudinal axis of the cannula (21).   3. Device according to claim 1 or the re-   vendication 2, characterized in that the conveyor (2) is formed by an endless belt (5) running by successive advancements and by pressure rollers (8) associated with the upper side of the belt.   4. Device according to claim 3, character-   se in that the pressure rollers (8) are mounted individually dual on spring.   5 Device according to claim 3 or the res-   dication 4, characterized in that the pressure rollers (8) are mounted to rotate freely on a movable beam (7) using a jack (40).   6. Device according to any one of the claims.   tions, characterized in that it constitutes -a u-   independent functional unit, mounted on a support mun (9).   7. Device according to claim 6, charac-   se in that the beam (7) is resiliently mounted on the common support (9).   8. Device according to any of the claims   previous cations, characterized in that transport rollers (11) capable of carrying out a pivoting movement, which grip the bags (1) below the bottom (34) provided with   the valve (35) by adhesion, are arranged on the side conveyor inlet (2).   9 Device according to any one of the claims   previous cations, for a rotary bagging machine   fitted with cannulas which rotate around a vertical axis,   characterized in that it is mounted so that it can pivot about a vertical axis (41).   10 Device according to claim 9, character-   in that each cannula (21) is provided with a member   puller (23), in that on the path of this driving member (23) is placed a lever (20) and in that, for threading each bag (1), the device pivots around   the vertical axis (41) at an angle determined by the cooperation   tion between the drive member (23) and the lever (20).   11. Device according to claim 10, charac-   in that the lever (20) can be moved by means of a cylinder (18).   12 Device according to claim 10 or the   vendication 11, characterized in that, when threading   a bag (1), it pivots around the vertical axis (41)   be the force of a return spring (43).   13. Device according to claim 12, charac-   in that there is a pneumatic cylinder in place of the return spring (43).   14. Device according to claim 9, charac-   in that there is provided a stop (44) to immobilize it in its starting position.   15 Device according to claim 14, character-   se in that the stop (44) is elastic.   16. Device according to claim 9, character-   in that the conveyor (2) can be started by a signal emitted by the cannulas (211 and can be stopped   by a feeler (28) which controls the position of the bag.