EP2637934B1 - Device for handling blanks in packaging machines - Google Patents

Description

The invention relates to a device for transporting flat pieces according to the preamble of claim 1.

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 individually, transported at a distance from one another along a blank web and fed to a folding turret. The arranged in the blanking conveyor, namely transport rollers are designed in a special way, so that the transport of the blanks in exact relative position at high power or transport speed runs reliably.

A transport device for material webs of different thickness is known by two respective opposing conveyor rollers (FIG. US 2,715,024 ). The one (upper) conveyor roller is designed so that differences in thickness of the material web to be conveyed are compensated. For this purpose, the conveyor roller consists of a rigid outer ring and a likewise rigid hub. An intermediate ring consists of elastic material or of elastic molded parts of different design. The elastic Intermediate part is designed so that in different areas along the circumference of the roll different (elastic) resistors are constructed, in coordination with the structure of the material to be conveyed.

Also known is the use of two opposing roller pairs for the transport of a paper web ( JP 60 006 543 A ). In this conveying device, the rollers or roller pairs are arranged on both ends mounted axles or shafts. The rollers are rigid.

The invention is concerned with the particular storage of the transport rollers, such that they are precisely aligned during operation, ie in the transport position, and on the other hand can be replaced quickly by simple measures.

To solve this problem, the device for transporting the blanks with the features of claim 1 is formed.

The pair of rollers mounted on a cantilevered shaft pairs can be solved with the help of a quick-release device with a few simple steps, so that they are free to slide on the shaft or can be removed from this. It is just as easy to position the rollers in their working position on the shaft.

Fig. 1

ein Aggregat zur Handhabung von Zuschnitten in einer Verpackungsmaschine, in schematischer Seitenansicht,

Fig. 2

einen Ausschnitt II der Vorrichtung gemäß Fig. 1 in vergrößertem Maßstab,

Fig. 3

die Einzelheit gemäß Fig. 2 im Querschnitt III-III, bei nochmals vergrößertem Maßstab,

Fig. 4

einen nochmals vergrößerten Querschnitt der Einzelheit gemäß Fig. 3, jedoch ohne Zuschnitt,

Fig. 5

die Darstellung entsprechend Fig. 4 mit Zuschnitt zwischen den Förderrollen (Einzelheit V in Fig. 3),

Fig. 6

einen queraxialen Schnitt VI-VI in Fig. 3,

Fig. 7

eine Darstellung analog Fig. 3 in einer besonderen Montagestellung,

Fig. 8

eine Einzelheit VIII in Fig. 1, in vergrößertem Maßstab, nämlich eine Einschubstation eines Zuschnitts in einen Faltrevolver,

Fig. 9

die Einzelheit gemäß Fig. 8 in einer Draufsicht entsprechend Pfeil IX in Fig. 8,

Fig. 10

die Einzelheit gemäß Fig. 8 in einer veränderten Funktionsstellung,

Fig. 11

die Einzelheit gemäß Fig. 8 und Fig. 10 in einer Endstellung von Arbeitsorganen.

Hereinafter, operation and construction of the device according to the invention will be explained in more detail with reference to an embodiment shown in the drawings in connection with a packaging machine. It shows:

Fig. 1

an aggregate for handling blanks in a packaging machine, in a schematic side view,

Fig. 2

a section II of the device according to Fig. 1 on an enlarged scale,

Fig. 3

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

Fig. 4

a further enlarged cross section of the detail according to Fig. 3 but without cut,

Fig. 5

the presentation accordingly Fig. 4 with cut between the conveyor rollers (detail V in Fig. 3 )

Fig. 6

a cross-axial section VI-VI in Fig. 3 .

Fig. 7

a representation analog Fig. 3 in a special assembly position,

Fig. 8

a detail VIII in Fig. 1 on an enlarged scale, namely an insertion station of a blank in a folding turret,

Fig. 9

the detail according to Fig. 8 in a plan view according to arrow IX in Fig. 8 .

Fig. 10

the detail according to Fig. 8 in an altered functional position,

Fig. 11

the detail according to Fig. 8 and Fig. 10 in an end position of work organs.

Basically, it is about the transport of flat pieces, in particular blanks 10, which have a distance from each other and therefore front and rear form a paragraph due to the material thickness. 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 counter or 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 11 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 track 13, which is positioned above the folding turret 12, here with an inclined 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 15 of the folding turret 12 (open at the top).

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 downward 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 is a rounding unit 27 ( EP 0 667 230 A1 ) which prepares the blank for the manufacture of the aforementioned type of package. 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 path of movement of the blanks 10 in the area 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 spots 28 are transferred to the upwardly directed inside of a box front wall 30 of the blank 10 ( Fig. 8, Fig. 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 , 4 and FIG. 5 These are transported between two associated conveyor rollers, namely an upper roller 20, 21 and a lower roller 22, 23. The rollers are mounted 20..23 so that in the normal position between mutually facing peripheral surfaces 32, 33rd a gap 34 is formed, the thickness of which is preferably less than the thickness of the object 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 under appropriate load ( Fig. 5 ) elastically deformable or compressible, so that a larger gap 34 is created for the blank 10 due to 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, 36th

Accordingly, ribs 45 and grooves 46 are provided on the radially inner side for securing the support body 37, 38 with respect 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 projecting support members for the conveyor rollers in a resilient, fixed bearing piece 49. At a free end drive wheels or gears 50, 51 on the shafts 41, 42 are arranged. 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, here the sub-rollers 22, 23 (FIG. Fig. 3 ) are fixed by a retaining screw 53 with support ring on the shaft 42 and the shaft journal and clamped 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 roles 20, 21 are thereby released ( Fig. 7 ). For example, a faulty positioned blank 10 can be removed. But if the subrolls 22, 23 are to be removed, the retaining screw 53 must be released.

The drive of the objects to be transported - blanks 10 - takes place advantageously by cooperating, four roles, namely by top rollers 20, 21 and lower 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. 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 position directed into the folding shaft 25 (dashed line in FIG 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 cross-sectionally angular support thumb 63 is movable as a guide member for the blanking leg 62 substantially in the region of an arcuate deflection of the blank web 13 in the upright folding wall 64 of the folding shaft 25 and moved to change the angular position of a guide leg.

The conveyor units made of rollers (or analogously formed rollers) consists in a simple case of a single role, 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 sense described 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 cut 39 inner ring 11 blank subassembly 40 inner ring 12 folding turret 41 wave 13 blank path 42 wave 14 blank magazine 43 rib 15 bag 44 gutter 16 roller pair 45 rib 17 roller pair 46 gutter 18 roller pair 47 deepening 19 roller pair 48 head Start 20 top roll 49 stock items 21 top roll 50 gear 22 under Roles 51 gear 23 under Roles 52 Stand Off 24 sampling member 53 retention screw 25 folding shaft 54 clamping screw 26 stamp 55 actuating head 27 rounding unit 56 clamping sleeve 28 spot of glue 57 cone 29 glue assembly 58 palm 30 Box front wall 59 cone 31 Lid inner tab 60 track plate 32 peripheral surface 61 attack 33 peripheral surface 62 cut leg 34 gap 63 support thumb 35 outer ring 64 folding screen 36 outer ring 65 supporting rod 37 support body 66 threaded piece 38 support body

Claims (2)

1. An apparatus for transporting flat items at a distance from one another, in particular blanks (10) made of thin cardboard or other packaging material, in a packaging machine by means of conveying rollers (20, 21; 22, 23) or conveying rolls which each comprise an all-round, closed outer ring (35, 36) or outer casing made of dimensionally stable material, in particular of steel or other metal, for the formation of a running surface (32, 33), and a supporting body (37, 38) made of elastic material, in particular of rubber or plastics material, on the axially inner side of the outer ring (35, 36), wherein (at least) one conveying roller (20..23) is mounted on a projecting shaft (41, 42) that is supported at one end, characterized by the following features:

   a) a conveying unit for transporting in particular blanks (10) consists of pairs of rollers (16, 17, 18, 19) arranged on both sides of the movement path of the blanks (10),

   b) at least two respective and mutually assigned conveying rollers (20..23) arranged on a common shaft (41, 42) form upper roller (20, 21) and lower roller (22, 23), in each case being rotatable substantially in a common plane,

   c) at least the conveying rollers of one of the shafts (41, 42), in particular the upper rollers (20, 21) on the shaft (41), are detachable or removable from the shaft (41) by a quick-change device, specifically with the aid of a clamping sleeve (56) which is mounted detachably on the shaft (41, 42) and, in a clamping position, fixes the conveying rollers (20, 21) and after detaching releases the latter on the shaft (41),

   d) the clamping sleeve (56) is fixed on the shaft (41) by means of a thread (66) and is detachable by rotation,

   e) in the clamping position, the conveying rollers (20, 21) are fixed by means of conical clamping surfaces,

   f) a peripheral conveying roller (21) is fixed on the conveying roller (21) by an end cone (59) of the clamping sleeve (56) and by a conical mating surface (58),

   g) a second conveying roller (20) is fixed by clamping on a cone (57) of the shaft (41).
2. The apparatus as claimed in claim 1, characterized in that when a plurality of conveying rollers (20..23) are arranged on a common axle or shaft (41, 42), a spacer, in particular a spacer sleeve (52), is arranged between the adjacent conveying rollers, and the conveying rollers (20..23) are clamped by axial pressure members against end surfaces of the spacer sleeves (52).

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