FR2780333A1 - Machine for heat sealing paper packages - Google Patents

Abstract

The machine for heat sealing paper packages has cooperating heat sealing positions (1a,b) at the sides of the packages and reciprocated along the package transport direction. The sealing position drive has a linear motor (2) with fixed (2a) and movable (2b,c) sections, the latter having guides (3).

Description

i 2780333 The present invention relates to a device for

  processing of packaging material transported in con-

  tinu in particular for sealing the corners of paper bags having zones of thermoplastic material, which device comprises at least one treatment unit which has cooperating treatment zones, with opposing steps, arranged on opposite sides of the packaging material, l The processing unit can be moved, rhythmically, in the direction of transport and in the opposite direction, using a drive device. A device of this kind, already known (DE 37 15 146 C2), has two support plates arranged on both sides of a continuous transport path, at which

  tools and counter-supports of a milking unit

  are fixed. To ensure the synchronism of the

  material transport route and milking unit

  The support plates are driven and guided using a planetary gear and cranks. Support plate speed cannot be changed

  that to some extent by a drive motor

  ment to order. Guidance and drive of the plat-

  Support issues are complicated and expensive. During

  each phase of work, considerable masses must

  can be accelerated and braked, causing a significant reduction in the processing speed which

  limits the transport speed of this known device.

  Adaptation to synchronized, modified routes is only possible within a certain limit. In the

  part of this known solution, only a part related

  of the work phase is devoted to

actual treatment.

  On the basis of the state of the art, the object of the present invention is to create a simple and inexpensive construction device making it possible to

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  process the packaging material at a trans-

high port.

  The solution to this problem is provided by a

  processing device for packaging material trans-

  carried continuously of the above type, which is characterized in that the drive device is a linear motor whose secondary part is stationary while the primary part is connected to the processing unit which is mounted, movable in in the longitudinal direction, on a guide device which

  extends parallel to the abutment.

  The speed and path of the processing unit can be adjusted in a large

  beach. In addition, the forward speed can be con-

  considerably accelerated so that the speed of transport of the material strip is no longer limited by the speed of the processing unit. Due to the linear movement of the processing unit, a relatively large part of the advancement path is devoted to the actual processing, the linear drive requiring only minimal acceleration and braking ranges. The forward speed and

  downshift speed of the processing unit may

  can be ordered independently of each other

  so that the rhythmic interval can be selected

tioned at will.

  In advantageous embodiments of the invention: - the processing unit comprises a mobile treatment zone, arranged transversely to the direction of transport and a stationary treatment zone which, cooperating with the first, extends transversely

in relation to the transport plan.

  - the mobile treatment area transversely to the transport plane can be adjusted using

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  a stationary control line, parallel to the

secondary part.

  According to a preferred embodiment of the present invention, the processing device comprises two processing units which are connected to

the primary part.

  In advantageous embodiments of the invention: - the distance of the processing units, measured in the

direction of transport, is adjustable.

  - two primary parts cooperate with the secondary part. - the two primary parts are mounted, movable

  longitudinally, on a guide device

  mun. - the two primary parts can move in opposite movement in the direction of transport and the opposite direction. - the two treatment zones have different

  sides on the packaging material when the pri-

  mayor moves in the direction of transport and are

  distant when it moves in the opposite direction.

  - the guide device has two guide bars

parallel dages.

  the transport unit, designed in the form of a welding device, has an ultrasonic welding head arranged on one side of the paper bags and an anvil arranged on the opposite side, the ultrasonic welding head and the anvil being designed as a clamping device acting on the paper bags

during welding.

  - the two processing units attached to the same primary part have differently oriented weld zones corresponding to the two weld beads

provided for each paper bag.

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  - the two processing units of the same primary part have two identical welded zones corresponding to the weld beads

of two successive paper bags.

  The presence of two primary parts with opposite movement on a common secondary part also offers the following advantage: the advancing and acceleration forces exerted on the secondary part mutually cancel each other to a great extent so

  that the device is generally lighter.

  Hereinafter, an embodiment of the present invention is described more fully, by way of

  example, next to the attached diagram.

  Figure 1 is a front view of the device with

  a linear drive comprising two main parts

  mayors each equipped with two treatment units in the starting position; - Figure 2 is a front view of the device according to fig. 1 with two processing units in operation; - Figure 3 is a top view of the left area of the device in the direction of arrow III according to fig. 1; - Figure 4 is a side view along arrow IV

of fig. 2.

  A chassis 4 is equipped with a guiding device

  3 composed of two guide bars 3a and 3b between the

  which the secondary part 2a of a linear motor 2 is arranged. Each of the primary parts 2b and 2c of the

  linear motor 2 is equipped with two milking units

  ment 1 and can be moved on the guide device

  dage 3. The processing units 1 each have an upper work area and a lower work area 1a and 1b. FIG. 1 represents a processing unit 1 with an ultrasonic welding device for welding

2780333

  the angles of bags with folded bottoms. The upper work area has an ultrasonic welding head

  lc and the lower work area lb an anvil ld.

  The distance between the two processing units 1,

  placed on each of the primary parts 2b and 2c, depends on the interval of the parts of the bags to be welded. A control line 5, comprising four zones of identical design 5a, 5b, 5c, 5d, extends along the chassis 4. Zone 5c cooperates with the processing unit 1 left of the primary part 2b. Zone 5a, represented by FIGS. 1 and 2 upstream of zone 5c, cooperates with the right processing unit 1 of the primary part 2b and is offset, towards the control zone 5c, in the direction opposite to the direction of

  transport 7, a distance equal to the interval between

  both between these two processing units. The 5d area of

  the command line, which cooperates with the processing unit

  straight line 1 of the primary part 2c, is offset, in the same way, in the opposite direction to the direction of

  transport, downstream to zone 5b of the transport line

  mande, which cooperates with the left processing unit 1

of the primary part 2c.

  The ultrasonic welding head lc of each processing unit 1 is installed stationarily on the primary parts 2b and 2c and is held in the

  treatment area by positioners

lie the.

  The anvil 1d, on the other hand, can be raised and lowered perpendicular to the direction of transport 7 of the packaging material, not shown. For this purpose, an adjustment lever 6 is provided, which is provided with a

  feeler roller 6a which explores the command line 5.

  The feeler rollers 6a of the processing units 1 of the primary parts 2b and 2c are each offset by a distance equal to the width of the control zones 5a,

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  c resp. 5b, 5d, perpendicular to the direction of trans-

  port 7 and horizontally with respect to each other.

  As can be seen from FIG. 2, the adjustment lever 6 is fixed, pivoting, to the treatment zone 1b movable transversely or vertically. The pivoting of the adjustment lever 6 is limited in one direction by a stop 6b which comes to bear against a

antagonistic zone.

  Figure 4 shows the profile of the chassis 4 which includes a short horizontal branch, on which

  command line 5 is supported, and a long branch

  vertical che which carries the guide bars 3a, 3b designed in the form of circular guides. These guide bars are engaged in positioning holes fitted to the part 2b which carries the processing unit 1

  composed of the vertically non-movable treatment area

  and the vertical mobile treatment area

  slightly lb. In FIG. 1, the primary parts 2b and 2c are

  find at their extremely external reversal points

  laughing. As the command line zones 5a, 5b, c and 5d are then lowered, a gap appears between the upper treatment zone la and the lower treatment zone lb and lets the material pass

packing.

  When the primary parts 2b and 2c move towards each other, towards the center, the units

  treatment 1 of the left primary part 2b execution

  attempt a return stroke while the processing units 1 of the right primary part 2c execute a working stroke. As can be seen from FIG. 2, the adjustment levers 6 of the two left processing units 1 then pivot to the left, by the ramps of the areas of the control line 5a and 5c so that these processing units 1 retain the gap. In

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  as regards the two processing units 1 of the right primary part 2c, the adjustment levers 6 are held by the stop 6b in their straight position; the anvil ld and the ultrasonic welding head lc come to bear on the different sides of the packaging material during the rise to the highest level of the control line 5. During this operation, the primary part 2c moves at the same speed as the packaging material. The length of the ramps of zones 5b and 5d of the command line 5 is sufficient to accelerate the speed of the primary part 2c until it is equal to the speed of transport of the packaging material before the latter is clamped between the ultrasonic welding head lc and the anvil ld. Due to the offset of zones 5b and 5d of the line of

  order, the packaging material is tightened simultaneously-

  in the two processing units 1 of the part

primary 2c.

  Before reaching the respective reversal points

  tifs of the two adjacent primary parts 2b and 2c, located inward, the packaging material is released from the processing units 1 of the right primary part 2c by lowering the command line zones 5b and 5d 5 and the levers of setting 6 of the processing units 1 of the primary part 2b return to their upright position. After having reached their reversal points and having executed an antagonistic movement in the direction of advance according to arrow 7, the units

  processing of the left primary part 2b performed

  kill the work path in the manner already described previously for the processing units 1 of the right primary part 2c. The interstices also remain present in the processing units 1 of the right primary part 2c, the adjustment levers 6 being tilted to the left and released from the stops.

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  as previously described for the left primary part

  che 2b, about moving to the right according to

fig. 1 and 2.

Claims (13)

  1. Device for processing packaging material   the continuously transported wire, in particular for welding the angles of paper bags having zones of thermoplastic material, which device comprises at least one treatment unit (1) which has cooperating treatment zones (la; lb), on   antagonist, arranged on opposite sides of the material   packing riel, the processing unit (1) being able to be moved, rhythmically, in the direction of transport and in the opposite direction, using a drive device, characterized in that the device   drive is a linear motor (2) whose part   secondary tie (2a) is stationary while the part   primary tie (2b; 2c) is connected to the milking unit   ment (1) which is mounted, movable in the longitudinal direction   nal, on a guide device (3) which extends   parallel to the secondary part (2a).   2. Device according to claim 1, character-   laughed at by the fact that the processing unit (1) comprises   a mobile treatment area (lb), arranged transversely   dirty with respect to the direction of transport (7) and a stationary treatment zone (la) which, cooperating with the first, extends transversely to the plane transport.   3. Device according to claim 1 or 2, characterized in that the treatment zone (lb)   movable transversely to the plane of trans-   port can be adjusted using a stationary control line (5) parallel to the abutment (2a).   4. Device according to one or more of the res-   dications 1 to 3, characterized in that two uni-   treatment tees (1) are connected to the primary part (2b; 2c). 2780333   5. Device according to claim 4, character-   laughed at by the fact that the distance of the milking units   ment (1), measured in the direction of transport (7), is adjustable. 6. Device according to one or more of the res-   dications 1 to 5, characterized in that two par-   primary parts (2b; 2c) cooperate with the second part daire (2a).   7. Device according to one or more of the res-   dications 1 to 6, characterized in that the two primary parts (2b; 2c) are mounted, movable longitudinally, on a common guide device (3).   8. Device according to one or more of the res-   dications 1 to 7, characterized in that the two   primary parts (2b; 2c) can move in motion   che antagonist in the direction of transport (7) and the reverse.   9. Device according to one or more of the res-   dications 1 to 8, characterized in that, the two treatment zones (la; lb) carry different   sides on the packaging material when the pri-   mayor (2b; 2c) moves in the direction of transport (7) and are moved away when it moves in the direction opposite.   10. Device according to one or more of the res-   dications 1 to 9, characterized by the fact that the provision   guide rail (3) has two guide bars (3a; 3b) parallel.   11. Device according to one or more of the res-   dications 1 to 10, characterized in that the unit   transport (1), designed as a support device   dage, presents an ultrasonic welding head (lc) arranged on one side of the paper bags and an anvil (ld) arranged on the opposite side, the welding head at 11h 2780333 ultrasonic (lc) and the anvil (ld) being designed as a clamping device acting on the bags in paper during soldering.   12. Device according to one or more of the res-   dications 1 to 11, characterized in that two treatment units (1) fixed to the same primary part (2b; 2c) have differently oriented weld zones corresponding to the two weld beads provided for each paper bag.   13. Device according to one or more of the res-   dications 1 to 11, characterized in that two uni-   treatment tees (1) of the same primary part (2b; 2c) have two identical welded zones corresponding to the weld beads of two successive paper bags.