EP2637934A1

EP2637934A1 - Device for handling blanks in packaging machines

Info

Publication number: EP2637934A1
Application number: EP11763597.9A
Authority: EP
Inventors: Frank Oberschelp; Heiko Neudeck
Original assignee: Focke and Co GmbH and Co KG
Current assignee: Focke and Co GmbH and Co KG
Priority date: 2010-11-10
Filing date: 2011-09-27
Publication date: 2013-09-18
Anticipated expiration: 2031-09-27
Also published as: CN103221310A; WO2012062390A1; CN103221310B; EP2637934B1; DE102010050528A1

Abstract

Pairs of conveyor rolls (20, 21; 22, 23) are used for transporting planar individual items, in particular blanks (10) made of thin cardboard. In order to create a variable distance between circumferential faces (32, 33), a rigid outer ring (35, 36) of at least one conveyor roll can be elastically displaced transversely to the axis, that is, upwards or downwards. For this purpose, the outer ring (35, 36) is supported on an elastic supporting body (37, 38), which allows the transverse-axial movement of the outer ring (35, 36) relative to an axle or shaft (41, 42).

Description

Device for handling blanks in packaging machines Description

The invention relates to a device for transporting flat pieces at a distance from each other, in particular blanks of thin cardboard or other packaging material in a packaging machine by means of conveyor rollers or conveyor rollers which are elastically deformable or displaceable at least in the region of a lateral surface.

In the foreground is the transport of blanks in the production of hard packs, especially cigarette packs of the type folding box. The separately produced blanks are for example taken from a magazine and transported along a blank web and finally fed to a folding turret. The transport of the blanks in the area of this blank track is problematic because of the material thickness of the blanks on the one hand and the exact Lagerurrg the transport rollers on the other. In the apparatus according to EP 0 315 821, the conveyor rollers, which consist entirely of metal or steel, are mounted so as to be elastically displaceable transversely over the axes or shafts. By this resilient arrangement of the rigid roller units arise in practice problems regarding an exact positioning of the rollers, in terms of maintenance and replacement. The invention is therefore an object of the invention to improve the handling of flat pieces, in particular of (packaging) blanks, especially in terms of transport by novel transport units, which are reliable and safer with a simpler structure of the conveyor rollers or conveyor rollers and the entire drive unit.

To achieve this object, the device according to the invention is characterized by the following features: the conveyor rollers or conveyor rollers have a running around, closed outer ring or outer shell made of dimensionally stable material, in particular of steel or other metal,

the rigid outer ring or outer jacket forms the running surface of the conveyor roller or conveyor roller and abuts the piece or blank to be transported,

the outer ring or outer sheath is supported on its axially inner side on a support body of elastic material, in particular rubber or plastic, such that the outer ring or the outer sheath is displaceable with a corresponding pressure load total transverse axial elastic.

The conveyor rollers or conveyor rollers as an important component of the handling or transport unit for blanks in particular are therefore designed so that they act in their conveying effect as steel or other solid material. However, the changes in distance due to the thickness of successively promoted pieces or blanks can be controlled by a corresponding transverse axial elastic movement only the dimensionally stable outer rings or outer shells. The thus formed rollers or rollers are arranged on axles or shafts with rigid pivot bearings.

Other features of the invention peculiarities of the conveyor rollers or conveyor rollers in terms of design and arrangement of the substantially annular support body made of elastic material, such that a mutual protection against Relatiwerschiebungen between metallic and elastic parts of the conveyor rollers in the axial direction and / or provided in the circumferential direction. The special design of the rollers or rollers also allows a novel design of the drive and storage. A gear for the rotational movement of the rollers or rollers is arranged on one side. The rollers or rollers are mounted on cantilevered axles or shafts. A special Device for a fast (manual) release of the rollers allows a simplified maintenance or a change of rollers or rollers.

Finally, the invention relates to measures for securing glue spots on blanks glued during feeding to a folding turret. By controlling drive elements (conveyor rollers) and / or by mechanical support members, the movement of the blank or folding flaps of the blanks is influenced, so that the detachment of glue particles is prevented. Details of the handling of flat pieces, in particular blanks are explained in more detail with reference to units of a packaging machine shown in the drawings. It shows:

Fig. 1 shows an aggregate for handling blanks in one

Packaging machine, in schematic side view,

Fig. 2 shows a detail II of the apparatus of FIG. 1 in an enlarged

Scale,

3 shows the detail according to FIG. 2 in cross section III-III, at a further enlarged scale, FIG.

4 shows a further enlarged cross section of the detail according to FIG.

3, but without blank,

Fig. 5 shows the illustration corresponding to FIG. 4 with blank between the

Conveyor rollers (detail V in Fig. 3),

6 is a transverse axial section Vl-Vl in Fig. 3,

Fig. 7 is a view similar to Fig. 3 in a particular mounting position, Fig. 8 shows a detail VIII in Fig. 1, on an enlarged scale, namely a

Insertion station of a blank in a folding turret,

9 shows the detail according to FIG. 8 in a plan view corresponding to FIG. 9 in FIG. 8, FIG.

FIG. 10 shows the detail according to FIG. 8 in an altered functional position, FIG. 11 shows the detail according to FIG. 8 and FIG. 10 in an end position of FIG

Working units. Basically, it is about the transport of flat pieces, in particular blanks 10, which have a distance from each other and therefore form a heel front and back due to the aterialstärke. The transport problem therefore also relates to continuous webs, which are provided with spaced apart elevations, z. B. resting individual blanks.

As a means of transport conveyor rollers or conveyor rollers are used, which are arranged in pairs cooperating (top roller, lower roller) or interact with another solid base. Between the circumference of the conveyor rollers or conveyor rollers, namely the lateral surface, and a Gegenbzw. Support member (counter-roller, counter-roller, fixed base), a gap is formed, which is usually smaller than the thickness of the material, for. B. a blank. As a result, a pushing or conveying force can be transmitted to the piece to be transported, if this is moved between conveyor roller / conveyor roller and counter-member.

The device shown as an example is a cutting unit 1 1 for the preparation, transport and transfer of blanks 10 to a folding turret 12 of the packaging machine. An important component of the cutting unit 11 is a blank web 13, which is positioned above the folding turret 12, here with a sloping downwardly directed conveying plane. The blanks 10 are taken individually from a blank magazine 14, transported along the blank web 13, thereby prepared or processed and finally transferred to the folding turret 12 by inserting the blank 10 into a pocket (open at the top) of the folding turret 12.

The transport of the blanks 10 along the blank web 13 is wholly or partly effected by conveyor rollers or conveyor rollers, in the present case by pairs of rollers 16, 17, 18, 19. In the ideal case, two pairs of conveyor rollers act together, namely upper rollers 20, 21 and lower rollers 22, 23 between which the blank 10 is transported therethrough. The blanks 10 are removed individually by a removal member 24 the blank magazine 14 and inserted into the blank sheet 13. A first pair of rollers 16 detects the blank 10 and directs it into the plane of the blank web 13. In the conveying direction, a second pair of rollers 17 follows, such that the blank 10 can be taken over by the first pair of rollers 16 for further transport. The pair of rollers 19 is located on the entry side of a transfer station of the blank 10 to the folding turret 12 and to the pocket 15. For this purpose, the blank 10 is positioned over a folding shaft 25 and through a detected downwardly movable folding member, namely by a punch 26, which promotes the blank under erection of blank parts or folding flaps in the region of the folding shaft 25 into the pocket 15 (Fig. 11).

As an application example, the production of folding boxes is provided with rounded edges pack, so with round edges. The blank 10 is prepared for the attachment of round edges. In the area of the blank web 13, a rounding unit 27 (EP 0 667 230 A1) is operative, which prepares the blank for the production of the aforementioned type of packing. The roller pair 17 is positioned at the entry side and the pair of rollers 18 following the rounding unit 27.

Furthermore, it is provided that the blanks 10 are provided with glue in the region of the blank web 13. In the present case, glue spots 28 are transferred to the blank 10. For this purpose, a glue unit 29 is positioned above the movement path of the blanks 10 in the region of the blank web 13, with adjacent glue nozzles each transferring a glue point 28 onto the blank 10. In the present case, a plurality of glue dots 28 are transferred to the upwardly directed inside of a box front wall 30 of the blank 10 (FIGS. 8, 9). Furthermore, glue spots 28 are applied in the region of a lid inner tab 31 on the same side of the blank. The glue unit 29 is positioned between the roller pairs 18, 19. A special feature is the design of the conveyor rollers (or alternatively conveyor rollers), which are formed so that on the one hand a rigid outer tread is formed, but this - on the other hand - in a narrow range - is elastically displaceable transversely axially to accommodate different thicknesses of the transported objects , Fig. 4 and Fig. 5 show situations when transporting blanks 10. These are transported between two associated conveyor rollers, namely an upper roller 20, 21 and a lower roller 22, 23. The rollers 20..23 are mounted so that in the normal position between facing circumferential surfaces 32, 33, a gap 34 is formed, the thickness of which is preferably less than the thickness of the article to be conveyed - blank 10. For example, a gap 34 of 0.15 mm is formed. If a blank 10 is detected between the rollers 20..23, there is a greater distance between the peripheral surfaces 32, 33, for example, according to the thickness of the blank 10 (about 0.3 mm). This change in distance between the peripheral surfaces 32, 33 is effected by an elastic displacement of the peripheral surface 32, 33 of at least one of the conveyor rollers in the radial direction.

The conveyor rollers 20..23 are elastic in itself. An outer, rigid molding, namely an outer outer ring 35, 36 forms the peripheral surface 32, 33 and consists of dimensionally stable material, in particular steel. The outer ring 35, 36 is fixed on a preferably running around, ie substantially annular elastic support body 37, 38. This consists of elastic material, ie plastic, rubber or preferably Vulkollan (polyester urethane rubber). The support body 37, 38 is elastically deformable or compressible with a corresponding load (FIG. 5), so that a larger gap 34 for the blank 10 is created due to a corresponding displacement of the outer rings 35, 36. The elastic support body 37, 38 can be arranged directly on an inner support or an axis or shaft of the conveyor roller. In the present case, an inner body is provided for attaching the support body 37, 38, namely an inner ring 39, 40, preferably made of metal (steel). This in turn is mounted on an axle or shaft 41, 42. The parts of a conveyor roller 20..23 are positively connected to each other, so that even with prolonged use and a corresponding load, the elastic support body 37, 38 not from the rigid metallic parts 35, 36; 39, 40 is solved. In the axial direction, the parts 35, 36; 37, 38; 39, 40 secured by corresponding projections and depressions against each other. In the present embodiment, the support body 37, 38 is provided with outer annular ridges 43 which enter into correspondingly formed (annular) recesses or grooves 44 of the outer ring 35, 36. For example, two ribs 43 on the one hand and two corresponding grooves 44 on the other hand are provided, each with a trapezoidal cross-section. These projections and depressions secure the support body 37, 38 with respect to the outer ring 35, 36. Accordingly, ribs 45 and grooves 46 are provided on the radially inner side to secure the support body 37, 38 relative to the inner ring 39, 40th

Furthermore, a backup with projections and recesses against relative rotation of the support body 37, 38 is provided. The inner part or inner ring 39, 40 is provided with radially directed recesses, in this case with trough-like or part-circular recesses 47. In this material enters the support body 37, 38 a form-fitting manner with a corresponding projection 48 a. As a result, the support body 37, 38 is secured against rotation relative to the drive member. Several (three) positive connections 47, 48 are arranged distributed along the circumference.

By integrated into the conveyor rollers 20..23 elastic displacement of the rigid peripheral surfaces 32, 33 is a special storage with a corresponding drive of the conveyor rollers possible. These are detachably mounted on the drive shafts 41, 42. The shafts 41, 42 are rotatably mounted as cantilevered or cantilevered support members for the conveyor rollers in a load bearing fixed bearing piece 49. Drive wheels or gears 50, 51 are provided at a free end arranged on the waves 41, 42. The (upper) shaft 41 is driven in rotation. Their drive is transmitted to the (lower) shaft 42 via the gears 50, 51. The transmission 50, 51 is housed in a closed transmission housing, not shown. The conveyor rollers 20..23 are mounted in a region of shafts 41, 42 with a reduced diameter. The rollers can be pulled off the shafts 41, 42 or the shaft journal formed in the axial direction. The exact distance between the adjacent rollers 20, 21 on the one hand and 22, 23 on the other hand is ensured by a spacer sleeve 52 on the shaft 41, 42. At least two of the rollers, in this case the lower rollers 22, 23 (FIG. 3), are fixed on the shaft 42 or the shaft journal by a retaining screw 53 with a support ring and braced in the axial direction.

The arrangement of the conveyor rollers 20..23 allows easier removal thereof by a changing device, which is used in conjunction with the upper rollers 20, 21. The rollers 20, 21 are fixed by a (manually) releasable clamping device in the working position on the shaft 41. A clamping screw 54 is adjustably and releasably connected to a free end of the shaft 41, in particular via a threaded piece 66 attached to the shaft 41. The clamping screw 54 has an actuating handle or actuating head 55. This can be operated in particular by hand in the sense of a rotation. The actuating head 55 is provided with a clamping sleeve 56 as a clamping member. By turning the actuating head 55, the rollers 20, 21 are fixed or released in the working position, so that they can be removed from the shaft 41 (Fig. 7). The clamping sleeve 56 surrounds a free end portion of the shaft 41 and at the end forms clamping surfaces which act on the facing roller 21.

The tension of the (upper) rollers 20, 21 is effected by means of conical clamping surfaces. The transition between the portions of the shaft 41 of different diameter is formed as a cone 57. Axial inner surfaces 58 of the rollers 20, 21 are suitably conical. As a result of transmitting axial pressure from the clamping sleeve 56 via the spacer sleeve 52, the roller 20 is pressed against the cone 57 and fixed so. Accordingly, the area of the roller 21 is formed. The end of the clamping sleeve 56 is formed as end cone 59. This receives contact with the inner surface 58 of the roller 21 and fixes them under contact with the spacer sleeve 52.

To remove the upper rollers 20, 21, the clamping sleeve 56 is removed by means of the actuating head 55 of the shaft 41. The respective rollers 20, 21 are thereby released (FIG. 7). For example, a faulty positioned blank 10 can be removed. But if the lower rollers 22, 23 are to be removed, the retaining screw 53 must be solved.

The drive of the objects to be transported - blanks 10 - takes place advantageously by cooperating four roles, namely by top rollers 20, 21 and sub-rollers 22, 23, as a conveyor unit. The conveyor rollers with elastically adjustable outer ring 35, 36 can be combined with other conveying organs. Thus, the pair of rollers 17 at the entrance of the rounding unit 27 as a combination of sub-rollers 22, 23 formed with elastically mounted outer ring 36 and top rollers as a total massive steel rollers, namely as an input role for the rounding unit 27. The remaining pairs of rollers 16, 18 and 19 are suitably from matching formed (elastic) roles. The associated rollers 20, 22 and 21, 23 are formed with different axial dimensions, in particular, the lower rollers 22, 23 dimensioned with a greater width than the upper rollers 20, 21 (Fig. 4, Fig. 5). The blank track 13 is provided in the predominant area with a base for the blanks 10, namely a track plate 60 with recesses in the area of the rollers 20..23.

Due to the increased cycle numbers and associated speeds of movement, there is a risk that glue applied to the blank 10, ie in particular the glue spots 28, will be completely or partially detached from the carrier. This applies in the end region of the conveying movement of the blank 10 along the blank web 13 and during the introduction into the folding shaft 25. The end position of the blank 10 above the folding shaft 25 is determined by a stop 61. The (provided with glue) blank 10 is conveyed with the lid inner tabs 31 against this stop. To mitigate the impact of the blank 10 on the stop 61, the folding shaft 25 associated pairs of rollers 19 are driven non-uniformly, namely such that immediately before impact of the blank 10 on the stop 61, the rotational speed of the rollers is reduced 20.23 and thus a gentle impact of the blank 10 is ensured on the stop 61. The relative position is selected so that immediately upon reaching the stop 61, the blank 10 has left the area of action of the roller pairs 19 (FIG. 9).

Another backup for the glue points 28 in the box front wall 30 takes place in the upper region of the folding shaft 25. When inserting the blank 10 into the pocket 15 of the folding turret 12, a portion of the blank 10 is erected in the region of the folding shaft 25 to form a blank leg 62. There is a risk that glue spots 28 in the area of this blanking leg 62 are impaired. To avoid this effect, a support or guide member in the upper region of the folding shaft 25 is effective, namely adjacent to an upper arcuate, downwardly directed folding wall 64. A arranged on a movable support rod 65 support thumb 63 prevents that in the folding movement of the blank 10 is moved by downward movement of the punch 26 of the blanking leg 62 at an increased speed in a directed into the folding shaft 25 position (dashed line in Fig. 10). The support thumb 63 acts as an inside stop for the blanking leg 62 during the folding movement. The blanking leg 62 is guided substantially under contact with the folding wall 64. The angled cross-section supporting thumb 63 is as a guide member for the blanking leg 62 substantially in the region of an arcuate deflection of the blank sheet 13 in the upright folding wall 64 of the folding shaft 25 up and down movable under changing the angular position of a guide leg.

The conveyor units made of rollers (or analogously formed rollers) consists in the simple case of a Einzeletrolle, with a movable or working together. Optimal is the interaction of a total of four roles, that is two pairs of rollers, at least one role per pair of rollers in the described sense is elastic. The scope of the rollers refers to the conveyance of individual pieces or webs with different material thickness.

*****

LIST OF REFERENCE NUMBERS

10 Blank 39 Inner ring

1 1 Cutting unit 40 Inner ring

12 folding turret 41 shaft

13 blank web 42 shaft

14 blank magazine 43 rib

15 pocket 44 gutter

16 pairs of rolls 45 ribs

17 pair of rollers 46 channel

18 pairs of rollers 47 recesses

19 pair of rollers 48 projection

20 upper roller 49 bearing piece

21 top roller 50 gear

22 lower roller 51 gear

23 lower roller 52 spacer sleeve

24 removal element 53 retaining screw

25 Folding shaft 54 Tensioning screw

26 stamp 55 actuator head

27 Rounding unit 56 Adapter sleeve

28 glue point 57 cone

29 Glue aggregate 58 Inner surface

30 box front wall 59 end cone

31 Lid interior lobes 60 Track plate

32 Umfangsf pool 61 stop

33 peripheral surface 62 blanking leg

34 gap 63 supporting thumb

35 Outer ring 64 Folding wall

36 outer ring 65 support rod

37 supporting body 66 threaded piece

38 supporting body

Claims

claims

1. A device for transporting flat pieces at a distance from each other, in particular blanks (10) made of thin cardboard or other packaging material in a packaging machine by means of conveyor rollers (20, 21, 22, 23) or conveyor rollers, the elastically deformable at least in the region of a lateral surface are displaceable, characterized by the following features:

a) the conveyor rollers (20..23) or conveyor rollers have a running around, closed outer ring (35, 36) or outer shell of dimensionally stable material, in particular of steel or other metal, b) the rigid outer ring (35, 36) or outer sheath forms the running surface (32, 33) of the conveyor roller (20..23) or conveyor roller and abuts against the piece or blank (10) to be transported,

c) the outer ring (35, 36) or outer sheath is supported on its axially inner side on a support body (37, 38) made of elastic material, in particular rubber or plastic, such that the outer ring (35, 36) or outer sheath with a corresponding pressure load, a total of transverse axial elastic is displaced.

2. Apparatus according to claim 1, characterized in that the elastic support body (37, 38) of the conveyor roller (20..23) is supported on the radially inner side on a rigid support body, in particular on an inner ring (39, 40) made of steel or other metal.

3. Apparatus according to claim 2, characterized in that the inner ring (39, 40) directly or indirectly on an axle or shaft (41, 42) for driving the conveyor roller (20..23) or the conveyor roller is mounted.

4. Apparatus according to claim 1 or one of the further claims, characterized in that the conveying movement for the blanks (10) or the like by at least two opposing and cooperating conveyor rollers (20.23) - roller pairs (16, 17, 18, 19) - is effected, wherein the outer ring (35, 36) or its peripheral surface (32, 33) in Initial or normal position of the conveyor rollers (20..23) have a distance from each other which is slightly smaller than the thickness of the blank (10).

5. Apparatus according to claim 1 or one of the further claims, characterized in that a conveyor unit for the transport of particular blanks (10) arranged on both sides of the movement path of the blanks (10) roller pairs (16, 17, 18, 19) , namely with at least two on a common axis or shaft (41, 42) arranged conveyor rollers (20..23), wherein associated conveying rollers, namely upper roller (20, 21) and lower roller (22, 23) substantially in common planes rotatable are.

6. Apparatus according to claim 1 or one of the further claims, characterized in that the conveying roller (20..23) forming roller parts, in particular outer ring (35, 36) on the one hand, supporting body (37, 38) on the other hand and possibly inner ring (39 , 40) third side with respect to relative movements in the axial direction and / or secured in the circumferential direction, namely are fixed.

7. Apparatus according to claim 6 or one of the further claims, characterized in that the outer ring (35, 36), supporting body (37, 38) and

Inner ring (39, 40) are secured by projections and depressions due to positive mutual engagement against each other, preferably wherein the support body (37, 38) running in the circumferential direction ribs (43, 45) which with corresponding recesses or gutters (44, 46) the outer ring (35, 36) and / or the inner ring (39, 40) are positively engaged.

8. Apparatus according to claim 6 or one of the further claims, characterized in that to avoid Relatiwerschiebungen in the circumferential direction, at least the inner ring (39, 40) on the circumference projections and / or depressions, which correspond to recesses and projections of the support body (37, 38), in particular trough-shaped recesses (47), into which correspondingly formed projections (48) of the support body (37, 38) fit, positively enter.

9. Apparatus according to claim 1 or one of the further claims, characterized in that a conveying roller or a plurality of conveying rollers (20..23) mounted on a cantilevered, cantilevered shaft (41, 42) and secured by axial clamping.

10. The device according to claim 9 or one of the further claims, characterized in that at least the conveyor rollers of one of the shafts (41, 42), in particular the upper rollers (20, 21) on the shaft (41) by a quick-change device detachable or from the Shaft (41) are removable, preferably by means of a clamping member - clamping sleeve (56) - which is releasably mounted on the shaft (41) and in a clamping position, the rollers (20, 21) fixed and after loosening these on the shaft (41) free.

1 1. Apparatus according to claim 10 or one of the further claims, characterized in that the clamping sleeve (56) by means of thread (..) on the

Fixed shaft (41) and is detachable by turning, wherein in the clamping position conveyor rollers (20, 21) are fixed by means of conical clamping surfaces, preferably such that an edge-side conveyor roller (21) by end cone (59) and conical counter surface and a second conveyor roller ( 20) is fixed by clamping on a cone (57) of the shaft (41).

12. The device according to claim 1 or one of the further claims, characterized in that when arranging a plurality of conveyor rollers (20..23) on a common axis or shaft (41, 42) between the adjacent conveyor rollers, a spacer, in particular a spacer sleeve (52). arranged and the conveyor rollers (20..23) are clamped by axial pressure elements to end surfaces of the spacer sleeves (52).

13. Device according to claim 1 or one of the further claims, characterized in that associated conveying rollers (20..23), in particular a conveyor unit with roller pairs (19) adjacent to a folding shaft (25) following the blank web (13), are driven non-uniformly, in particular such that the conveying speed of the blanks (10) in the final phase of the conveying movement, namely before reaching a stop (61) at the end of the blank web (13) is reduced.

14. The device according to claim 1 or one of the further claims, characterized by guide means, in particular by at least one

Support thumb (63), for securing the blank (10), namely a (upright) cut leg (62) formed during lowering of the blank (10) in the folding shaft (25) against unwanted pivoting movement, wherein the blank leg (62) by the guide means or the support thumb (63) is held during the downward movement substantially in abutment against an arcuate and upright folding wall (64).

15. The apparatus according to claim 14, characterized in that the angular cross-section support thumb (63) in the region of an arcuate deflection of the blank web (13) in the substantially upright folding wall (64) up and down is movable while changing the angular position of a guide leg.

*****