EP0752308B1 - Apparatus for scoring continuously moving flat blanks - Google Patents

Description

The invention relates to a device for creasing continuously conveyed flat workpieces to be folded along crease lines, preferably for attaching the inclined Pre-folding lines on tube pieces to prepare the folds Cross bases to be formed, consisting of parallel to each other Shaft-mounted creasing tools, some of which are made from a Groove (female) and the other part from a web (male) exists that is helical over those described by them Envelope cylinders run and in the contact area of their Surface lines come into engagement with one another, with the Setting the length of the crease or pre-fold lines Tool part from packages of close to each other, the Disc-shaped or plate-shaped segments carrying grooving tools consists of at least a part rotatable and in different angular positions fixable on the shaft is held.

From DE-GM 19 64 069 is a creasing device for attachment of the diagonal creases at the ends of flat tube pieces known in the manufacture of sacks, the pre-folding lines for the cross bottoms to be molded onto the tube pieces. In this known device are on each of two to each other parallel shafts each carrying two creasing tools Segments clamped to each other in their angular position can be changed so that it can adapt to different Formats at the ends of the tube pieces in one station each Have both diagonal grooves applied.

To partially over the triangular pockets Corner turns of the ground squares to be turned over To widen side turns, it is common for the cut ends the tube pieces with two incisions parallel to each other to provide. Be the diagonal creases over these cuts If they run out, the triangular sections thus divided tend Pieces to unfold around the crease lines so that the leading ones triangular pieces form butt edges that are flawless hinder further processing and thereby to malfunctions being able to lead. To avoid such disruptions, it is necessary to do the diagonal creasing on the leading Side of the cross-conveyed piece of hose starting from the leading one Fold edge only up to the incision, see above to avoid a creasing line dividing a triangular piece becomes.

With the devices known from DE-GM 19 64 069 lets the length of the diagonal creases to adapt to the side flaps do not adjust the cuts that widen the floor.

From the brochure of Windmöller & Hölscher "AD 2366 / AD 2368" (with the imprint: 15/82/987 / T 1.5) is a device of known at the outset, but for each of the both to be attached to one end of a piece of hose and diagonally provided a pair of creasing rollers is. In this known device can be twisted and fixing the segments carrying the creasing tools again set the length of the crease lines. This known device is, however, expensive in that the two are attached Diagonal creasing at the ends of the hose pieces, two pairs of creasing rollers must be provided.

The object of the invention is therefore a device of the beginning specified type to create, in which the two diagonal creases at the ends of the hose pieces if possible the setting of the length of the leading diagonal creasing line Make only one pair of creasing rollers on the end cuts to let.

According to the invention, this object is achieved at the beginning of a device specified type solved in that on each shaft cylindrical shell-shaped segment of a second creasing tool and that the one segment is helical with a groove and the other segment is helically provided with a web, those in the contact area of their surface lines that described by them Envelope cylinders come into engagement with each other.

The device according to the invention is characterized in that the individual sections of the segments carrying the creasing tools without hindrance by the second creasing tool for adjustment the desired length of the leading diagonal creasing line allow to twist relative to each other.

According to an advantageous embodiment, it is provided that everyone of the two cylindrical shell-shaped shell segments of the second Creasing tool at an axial end area by a radial Bridge connected to a hub attached to the shafts is and connectable to the shafts with an axially projecting part Rings or disks that overlap with the first creasing tools supporting segments are connected. This configuration makes it easy for everyone Shaft supported parts of the two creasing tools in the required Way when rotating on a common envelope cylinder are located.

A particular problem is that of hiring desired length of the crease line rotatable disks or segments in the correct angular position on the shaft to fix. In order to achieve this, the invention provides that each have an end hub or disc rotatable each shaft is connectable and that the package of the rotatable Segments for its fixation against the hub by means of a clamping device is exciting. Even the one that cannot be turned on its own Each shaft connectable hub or disc can be a segment of the wear the first creasing tools.

In a further embodiment of the invention it is provided that each of the two hubs which can be connected to each shaft in a non-rotatable manner a cylindrical shell-shaped device having a creasing tool via a web Segment that contributes in the opposite direction each of the cylindrical shell-shaped segments of the second creasing tool protrudes.

Each clamping device can consist of disc springs that are on the one hand on a collar of the shaft and on the other hand support a sliding bush mounted on the shaft, which in turn relate to the rings or Supports washers. In order to twist the rings or disks to remove this acting voltage, the socket with be provided with an annular flange to which one in the frame mounted and the bush moving towards the disc spring Rocker arm attacks. Each rocker arm can consist of a two-armed There are levers that can be pivoted by an eccentric is.

In a further embodiment of the invention it is provided that the the segments of the first grooving rings or washers are provided with grooves concentric to the shafts into which grasp bolts attached to adjacent rings or washers.

The creasing tools of the segments expediently rest on a spiral line if the bolts at one end of the Grooves. In this way, the rings or disks easy and quick for the purpose of lengthening the length align a crease line relative to each other.

The parts of the creasing tools of both rollers are preferably in divided segments rotatable relative to each other. After a Another preferred embodiment provides that the segments both parts of the creasing tools so offset from each other that they cannot interfere with each other, if the bolts are at the other ends of the grooves. A such twisting of the segments of both co-operating rollers a creasing tool is required, for example, if the two tool parts that perform the diagonal creasing in the case of narrower pieces of hose, they are closely approximated.

The distance between the two perpendicular crease lines can only be done by rotating the segments of the first creasing tools can be set. But the distance can also be changed can be set that the cylindrical shell-shaped segments of the second creasing tools by a releasable clamp connection with the Waves is connected.

According to a further preferred embodiment, that each shaft from a hollow shaft and one supported in it Shaft exists that the first creasing tools on the hollow shaft stored or fastened and the second creasing tools on the the hollow shaft projecting from the shaft are fastened and that each shaft and each hollow shaft drive them separately Gears is provided. This configuration enables it, simply by relative rotation of the gears set the distance between the diagonal creasing lines or to adjust.

Fig. 1

eine Seitenansicht der erfindungsgemäßen Rillvorrichtung in schematischer Darstellung,

Fig. 2

eine Draufsicht auf die Rillvorrichtung nach Fig. 1 mit zwei aus Schlauchstücken bestehenden Sackwerkstücken, von denen das vorauslaufende bereits mit Diagonalrillinien versehen worden ist,

Fig. 3

eine Ansicht des Rillwalzenpaares in Richtung der Pfeile III-III in Fig. 2 in vergrößerter Darstellung,

Fig. 4

eine Seitenansicht des Rillwalzenpaares gem. Fig. 1 in vergrößerter Darstellung,

Fig. 5

einen Querschnitt durch das Rillwalzenpaar längs der Linie V-V in Fig. 4,

Fig. 6

eine Abwicklung der oberen Rillwalze,

Fig. 7

eine Abwicklung der unteren Rillwalze des Rillwalzenpaares und

Fig. 8

das durch das Rillwalzenpaar hindurchgelaufene Sackwerkstück mit der durch die Einstellung des Rillwalzenpaares gem. Fig. 6 und 7 bewirkten Rillung,

Fig. 6a bis 8a

eine den Fig. 6 bis Fig. 8 entsprechende Darstellung, bei der die verdrehbaren Segmente beider Rillwalzen des Rillwalzenpaares auf ein schmaleres Sackwerkstück eingestellt sind,

Fig. 9

eine Abwicklung des Schnitts durch die untere Rillwalze des Rillwalzenpaares längs der Linie IX-IX in Fig. 4 und

Fig. 10

einen Schnitt durch die untere Rillwalze längs der Linie X-X in Fig. 9.

An embodiment of the invention is explained below with reference to the drawing. In this shows

Fig. 1

a side view of the creasing device according to the invention in a schematic representation,

Fig. 2

1 with two bag workpieces consisting of hose pieces, of which the leading one has already been provided with diagonal creasing lines,

Fig. 3

2 shows an enlarged view of the pair of creasing rollers in the direction of arrows III-III in FIG. 2,

Fig. 4

a side view of the creasing roller pair gem. 1 in an enlarged view,

Fig. 5

3 shows a cross section through the creasing roller pair along the line VV in FIG. 4,

Fig. 6

development of the upper creasing roller,

Fig. 7

a development of the lower creasing roller of the pair of creasing rollers and

Fig. 8

the sack workpiece that has passed through the creasing roller pair with the one according to the setting of the creasing roller pair. 6 and 7 caused creasing,

6a to 8a

6 to 8, in which the rotatable segments of both creasing rollers of the creasing roller pair are set to a narrower bag workpiece,

Fig. 9

a development of the section through the lower creasing roller of the creasing roller pair along the line IX-IX in Fig. 4 and

Fig. 10

a section through the lower creasing roller along the line XX in Fig. 9th

1 shows a pair of creasing rollers 1 in a side view, through its gap from that also shown only schematically Double belt conveyor made of 2 transverse hose sections Paper for the production of paper bags are conveyed through. The double belt conveyor 2 consists of two endless Bands between the grooved roller pairs shown in FIG. 2 1, 1 'on the cross-conveyed hose sections 6, 6' Grip the paper so that the cut edges are provided Ends of the hose sections for the purpose of scoring them through the Column of creasing roller pairs 1, 1 'can run through.

The creasing roller pairs 1, 1 'are mirror images of the transverse center plane designed the same way, so that in the following only the pair of creasing rollers 1 is described in more detail.

The upper creasing roller 3 of the creasing roller pair 1 is basically constructed in the same way as the lower creasing roller 3 ', however with the difference that the lower creasing roller 3 'for formation of creasing or pre-folding lines with helical ones Grooves (dies) and the top creasing roller 1 in these grooves engaging webs (patrices) is provided.

The tube pieces 6 are made of single-ply or multi-ply paper at their cutting edges 7, 7 'with the leading and trailing Side edges parallel incisions 8 provided after opening the sides of the hose sections provided with the cut edges to ground squares lead to wider side turns or form side flaps after they are flipped on the triangular pocket-shaped corner inserts for better flooring to lead. However, good soil training is only guaranteed if the later diagonal fold lines of the corner folds be grooved to form fold lines. Such Creasing means that in the flat hose pieces groove-shaped grooves are embossed from paper in cross-section, who strive, those divided by the scoring Erect sections of the hose pieces. To raise this up to prevent those in the direction of arrow A by the Creasing roller pairs 1, 1 'conveyed through hose pieces their leading side only with short diagonally running Creasing lines 9 are provided, starting from the leading side edge in the area of the end of the leading incision 8 end up. Would the crease line 9 continuously up to the cutting edge 7 would be executed, that would be formed by the incision 8 triangular pieces strive to move around through the crease line formed base erect so that through the incision 8 formed cutting edge of the triangular piece one Would form a butt edge, the perfect further processing of the hose section would hinder. This unfolding of the triangular piece could also not be prevented by that when executing continuous diagonal crease lines the incisions 8 will be made later because of the through applying the crease lines generated stresses so quickly cannot be dismantled.

On the other hand, the diagonal trailing crease line, that meets the inner end of the trailing incision 8, run continuously up to the cutting edge 7 because a possible uprighting of that divided by the crease line 10 triangular piece is harmless, because in this the incision 8 cannot form a butt edge, since it runs on and therefore when the divided triangular piece is pushed into the level of the hose piece is pressed down.

The creasing rollers 3, 3 'of the creasing roller pair 1 are each with two segments 4, 4 'and 5, 5' provided the grooving tools form.

The creasing rollers 3, 3 'have first of cylindrical shells 4, 4' existing segments, of which the segment 4 'with a helical shape extending groove and segment 4 with a corresponding helically extending web 13 (Fig. 5) is provided, which at Pass through the gap formed between the creasing rollers.

The creasing rollers 3, 3 'are provided with further segments 5, 5', of which the lower segment has a helical shape Groove and the upper segment with a correspondingly helical shape extending web 16 is provided, which in its passage through the nip formed between the rollers in the FIG. 5 interlock clearly.

Guide the first creasing tools formed by the segments 5, 5 ' the short diagonal creasing lines 9 adjustable in length from the leading fold edges of the hose sections begin and in the area of the inner ends of the leading Incisions 8 ends. The formed by the segments 4, 4 ' Creasing tools execute the diagonal creasing lines that run continuously run from the cutting edge 7 to the trailing fold edge.

The cylinder shells 4, 4 'forming the second creasing tools are in accordance with their left end areas. 3 and 5 by radial webs 17, 17 'connected to the creasing roller shafts 19, 20. To connect the webs 17, 17 'with lower jaws provided bowl-shaped recesses, the approximately semicircular Profile a radius corresponding to the creasing roller shafts 19, 20 has. Counter jaws are for clamping onto the creasing roller shafts 18, 18 'provided the identical cup-shaped recesses have and by not shown screws with the the webs 17, 17 'molded jaws for clamping to the creasing roller shafts 19, 20 are braced. After loosening the not illustrated clamping screws, the segments 4, 4 'relative to the segments 5, 5 'on the creasing roller shafts 19, 20 to Rotate format setting and in newly set positions tense again with the waves.

Have the first creasing tools formed by the segments 5, 5 ' a disc-shaped structure. This disc-shaped structure will now be explained in more detail with reference to FIG. 3 and FIG. 5, which a section through the creasing roller pair along the line IV-IV 4.

Hollow shafts are in a side wall 22 of the machine frame 23, 24 supported by roller bearings 25, 26. The outer ring of the rolling bearing 25 is in an eccentric rotatable in the side frame 22 Socket 27 held so that by rotating this socket the center distance of the shafts 23, 24 for setting to different thick tube sections can be adjusted. On the shaft journal of the hollow shafts projecting beyond the side frame 22 23, 24 meshing gears 28, 29 are wedged. The shafts 19, 20 are mounted in the hollow shafts 23, 24, to the cylindrical shell-shaped in the manner described Segments 4, 4 'are clamped. On which the hollow shafts 23, 24 outstanding shaft journals of the shafts 19, 20 are gear wheels 30, 31 wedged.

The gears 28 to 31 are the same in normal operation Speed driven. However, the distance between the diagonal creasing lines 9, 10 or to precisely adjust this distance, can briefly one of the gear pairs 28, 29 or 30, 31 an additional rotation, for example via a differential gear, be granted. By such an additional speed the distance of the diagonal creasing lines can be changed when the format is changed 9, 10 change without clamping segments 4, 4 'to solve the shafts 19, 20.

On the inner ends of the hollow shafts 23, 24 are cylindrical Hubs 32, 33 wedged, which are cylindrical shell-shaped via webs 34, 35 Wear segments 36, 37, the outer shell pieces with the groove 15 and the web 16 are provided. On the hubs 32, 33 are disks 38, 39 and 38 ', 39' and on the hollow shafts 23, 24 Slices 40 to 43 and 40 'to 43' pushed on relative to each other are freely rotatable and support each other. The Support inner discs 38, 38 'pushed onto the hubs on annular flanges 44, 44 'of the hubs. The same diameter Discs 38 to 43 and 38 'to 43' are over disc springs 45, 45 'and bushings 46, 46' clamped together, wherein the plate springs 45, 45 'on the one hand on the bushes 46, 46 'and on the other hand on the flanks 47, 47' of bundles of rings Support the hollow shaft. In the position shown in FIG. 5 are the disks 38 to 43 and 38 'to 43' by the plate springs so braced together that they are non-rotatable relative to each other are held. Around the discs to adjust the length the crease lines 9 - which will be described in more detail below - To be able to rotate relative to each other, the bushings 46 are 46 'with annular flanges 48, 48' to which the shorter ones Lever arms 49, 49 'two-armed around the axes 50, 50' on the Can engage side frame 22 pivotally mounted lever, whose longer lever arms 51, 51 'can be rotated in the side frame supported eccentric cams 52, 52 'can be pivoted. Are the plate springs 45, 45 'over the two-armed rocker arm 49, 51 and 49 ', 51' have been pressed together Turn discs 38 to 43 and 38 'to 43' relative to each other.

The discs 38 to 43 and 38 'to 43' carry in the from 3 and 10 apparent way in plan view approximately rectangular Segments 55, 55 ', which are provided with the webs 16 and the grooves 15 are. The grooves 15 lie on the same envelope cylinder as that Grooves 12 of the segments 4 and the webs 16 lying on the same Envelope cylinder like the webs 13 of the segment 4.

The height of the segments 55, 55 'is so large that the segments bearing washers from the cantilevered parts of the cylindrical shell Segments 4, 4 'can be covered.

The disks 38 to 43 and 38 'to 43' are in that of FIG. 9 apparent way, which is a cut through the slices lengthways the developed line IX-IX in Fig. 4, provided with grooves 60. In these grooves engage pins 61 which are in the holes of the adjacent segments 37 or adjacent letters 38 'to 42' are held with a press fit. The length of the grooves is dimensioned that the creasing grooves 15 and the claws engaging in these 16 lie on a spiral circumferential line, as is apparent from the Segment 37 and the adjacent segments 55 'of the disks 38' up to 40 'can be seen. In the disks 41 'to 43' are the Pin 61 on the other ends of the grooves 61, so that the grooved pieces 15 of the segments 55 'in the one shown in FIG. 9 Way staggered to each other.

8 shows the arrangement of the crease lines 9 ', 10' in one Hose section 6 'of greater width can be seen that with creasing rollers have been generated, the developments of which are shown in FIG. 6 and 7 can be seen. The shorter crease line 9 'is by the a continuous spiral line forming web parts 16 of the Segments 36 and segments 55 of the adjoining disks 38 to 49 formed with the grooves of the segment 37 and the subsequent Segments 55 of the disks in the area of the nip come into engagement with each other. The segments 55 of the disks 41 to 43 are turned away in the manner shown in FIG. 3, so that they are not with the grooves of the segments 55 'of the disks 41 'to 43' can engage.

The length of the short crease lines 9 'can be adjusted in steps, that of the width of the segments of the screwed-in disks 38 corresponds to 43.

The settings of the disks can be seen from FIGS. 6a and 7a, if the diagonal creasing lines 9 'and 10' on one A piece of hose with a smaller width must be attached. In such a Case both segments 55 of disks 39 to 43 than the segments 40 'to 43' in the one shown in FIGS. 6a and 7a Be turned away with a stepped offset, so that this does not match the course of the web 13 or the groove 12 angled shell-shaped segments 4, 4 ' collide and can interfere with each other in their circulation. The turned away in the manner shown in Fig. 6a and 7a Segments 55 and 55 'are in their passage through the nip side by side.

The pattern of the segments 55 shown in FIGS. 6a and 7a and 55 'of the disks 39 to 43 and 40' to 43 'corresponds to that Rotary position of the disks 41 'to 43' in FIG. 9.

Claims (12)

1. Apparatus for creasing continuously conveyed flat workpieces to be folded along crease lines, preferably for applying the oblique overfold lines on pieces of tube made of paper to prepare the folds in crossbottoms to be formed, comprising creasing tools which are fixed to mutually parallel shafts (19, 23; 20, 24), of which tools some have a groove (die) and the others have a web (punch) which run spirally over the envelope cylinder described by these and, in the region of contact of their envelope lines, come into engagement with one another; wherein, in order to set the length of the crease or overfold lines (9, 9'), part of a tool comprises a set of disc-like or plate-like segments which are located close beside one another and carry the creasing tools and of which at least some are held on the shaft such that they can be rotated and fixed in different angular positions;
      characterized in that a segment (4, 4') shaped like a cylindrical shell and forming a second creasing tool is held on each shaft (19, 23; 20, 24); and
      in that one segment (4) shaped like a cylindrical shell is provided in a helical shape with a web (16), and the other segment (4') shaped like a cylindrical shell is provided in a helical shape with a groove (12) which, in the area of contact of their envelope lines of the envelope cylinder described by the latter, come into engagement with one another.
2. Apparatus according to Claim 1, characterized in that each of the two segments (4, 4') shaped like a cylindrical shell and belonging to the second creasing tool is connected at an axial end region, by means of a radial web (17, 17'), to in each case a hub fixed to the shafts (19, 20) and, with a part that projects axially, reaches over rings or discs (38 to 43; 38' to 43') which can be connected to the shafts (23, 24) and are connected to the segments (55, 55') carrying the first creasing tools (15; 16).
3. Apparatus according to Claim 1 or 2, characterized in that in each case a hub (32, 33) or disc at the end is nonrotatably connected to each shaft (23, 24); and in that the set of rotatable segments (55, 55') can be clamped by a clamping device in order to fix it against the hub (32, 33) or disc.
4. Apparatus according to Claim 3, characterized in that each of the two hubs (32, 33) is nonrotatably connected to each of the shafts (23, 24) and, via a web (34, 35), carries a segment (36, 37) which is shaped like a cylindrical shell and has a creasing tool (15, 16) and which projects in the direction opposite to each of the two segments (4, 4') shaped like a cylindrical shell and belonging to the second creasing tool.
5. Apparatus according to Claim 3, characterized in that each clamping device comprises disc springs (45, 45') which, on one side, are supported on an annular collar of each of the shafts (23, 24) and, on the other side, are supported on a displaceable bush (46, 46') that is pushed onto the shaft and which, in turn, is supported on the rings or discs (38 to 43; 38' to 43') that carry the segments (55, 55').
6. Apparatus according to Claim 5, characterized in that each bush (46, 46') is provided with an annular flange (48, 48') on which there acts in each case a tilting lever (49, 51; 49', 51') which is mounted in the frame (22) and moves each bush (46, 46') in the direction of the disc springs (45, 45').
7. Apparatus according to Claim 6, characterized in that each tilting lever is a two-armed lever, which can be pivoted by means of an eccentric (52, 52').
8. Apparatus according to one of Claims 1 to 7, characterized in that the rings or discs (38 to 43; 38' to 43') carrying the segments (55, 55') of the first creasing tool are provided with grooves (60) that are concentric with respect to the shafts and into which bolts (61) fixed to adjacent segments (34, 35), rings or discs engage.
9. Apparatus according to Claim 8, characterized in that the creasing tool parts of the segments (55, 55') lie on a helical line when the bolts (61) rest on one ends of the grooves (60).
10. Apparatus according to Claim 8 or 9, characterized in that the segments (55, 55') of the two parts of the creasing tools lie offset from one another in such a way that they cannot come into engagement with one another when the bolts (61) rest on the other ends of the grooves (60).
11. Apparatus according to one of Claims 1 to 10, characterized in that the segments (4, 4') shaped like cylindrical shells and belonging to the second creasing tool are connected to the shafts (19, 20) by a detachable clamping connection (18, 18').
12. Apparatus according to one of Claims 1 to 11, characterized in that each shaft comprises a hollow shaft (23, 24) and a shaft (19, 20) mounted in the latter, in that the first creasing tools (5, 5') are mounted on or fixed to the hollow shaft and the second creasing tools (4, 4') are fixed to the journals of the shafts projecting beyond the hollow shaft (23, 24); and in that each shaft (19, 20) and each hollow shaft (23, 24) is provided with gears (30, 31; 28, 29) which drive the said shafts separately.

Images