EP2689924B1 - Tool holding device - Google Patents

Description

The invention relates to a device for releasable attachment of rotary tools or tool holders on a drive shaft according to the preamble of claim 1.

Both printing presses with integrated further processing devices, for example for creasing or embossing, as well as further processing machines such as folding machines, cover feeders, perfect binder systems or Faltschachtelklebemaschinen have rotary tool units for processing the sheet-like material.

From the EP 1 574 323 B 1 For example, a creasing device for the rotary creasing of printed products is known.
Furthermore, from the US-A-2010/0218658 a device for cutting flat, arcuate material is known, wherein rotating cutting blades are used.

Also in the production of high-quality printed products for the packaging industry, such as folding cartons, sheets are first broad-web printed in a printing press. On the sheets are each several benefits of the carton to be printed, which are then punched out in a punch. The punched-out folding box blanks are then fed to a folding box gluing machine and processed here into folding boxes.

• Einen Einleger, der die zu verarbeitenden Zuschnitte mit hoher Geschwindigkeit aus einem Stapel nacheinander abzieht und einzeln der nachfolgenden ersten Bearbeitungsstation zuführt,
• Ein Auftragwerk für Klebstoff, üblicherweise Leim, das auf die zu verklebenden Faltlappen einen Klebstoffstreifen aufträgt und
• Eine Faltstation, in der die mit einem Klebestreifen versehenen Zuschnittteile zur Herstellung einer Klebeverbindung um 180° umgelegt, also gefaltet werden.
• Im Anschluss an die Faltstation ist üblicherweise eine sogenannte Überleitstation angeordnet, in der die Schachteln gezählt, markiert und - falls schadhaft - ausgeschleust werden können.
• Danach folgt eine Pressstation, an deren Anfang ein Schuppenstrom aus gefalteten zuschnitten gebildet wird, der in der Pressstation für einige Zeit unter Druck gehalten wird, damit die beiden Zuschnitte an der Klebenaht verbunden werden.

Folding box gluing machines for the production of folding boxes from folding box blanks are known to have at least the following modules as processing stations:

• A feeder, which pulls the blanks to be processed at high speed from a stack one after the other and feeds them individually to the subsequent first processing station,
• An applicator for glue, usually glue, which applies an adhesive strip to the folding flaps to be glued and
• A folding station in which the blank parts provided with an adhesive strip are folded by 180 °, ie folded, to produce an adhesive bond.
• Following the folding station usually a so-called transfer station is arranged, in which the boxes can be counted, marked and - if defective - can be discharged.
• This is followed by a pressing station, at the beginning of which a shingled stream of folded blanks is formed, which is held in the pressing station for some time under pressure, so that the two blanks are connected to the adhesive seam.

The individual processing stations have conveying means driven for transporting the folding box blanks. These consist for example of one or more superposed upper and lower conveyor belt, wherein the lower conveyor belt is guided in a roller cheek and the upper conveyor belt in a roller rail. The conveyor belts are arranged transversely adjustable and can thus be adjusted to the respective folding carton blank format. The blanks are transported printed side down between the top and bottom conveyor belts.

From the US Pat. No. 7,402,129 B2 For example, such a folding box gluing machine is known.

In addition, folding carton gluing machines optionally have modules for grooving, punching and embossing, for example for embossing Braille fonts in pharmaceutical packaging.

From the US 7,794,379 B2 is a Faltschachtelklebemaschine known with a module for embossing Braille.

To be able to perform folds transversely to the transport direction of the folding box blanks, additional devices are installed in the folding box gluer. Such devices are for example from the American patent specification US 7,678,035 B2 known. They are used to make folding cartons with or without triangular lobes, as is the case with 4-point, 6-point, folded bottom or special boxes is usual, used. In a known device of this type, the rear folding tools consist of below the transport plane mounted hooks, which attack with their free bent ends the initially flat lying rear web from below and overtake them on further transport of the blank, so that the web is folded inwards and flat on the folding carton blank. Such a folding tool is also called overtaking hook.

Furthermore, Faltschachtelklebemaschinen optionally have rotatably mounted on an axis Aufraißhaken. This is a pivotable support lever, at the end of a hook-shaped element is fixed, with which a leading blank section can be deflected out of the conveying plane and folded back. Such a device is for example from the US 7,179,216 B2 known.

In all these devices, an adaptation of the tool to the respective sheet format to be processed or the change of tools is very expensive. For this purpose, it is necessary for the rotary tools and / or tool holders to be freely displaceable along the drive shaft. At the same time it is also necessary that the fit for the connection drive shaft - tool holder is as free of play as possible in order to prevent movements of the tool or tool holder on the shaft. This is especially important if, as with rotary Braille modules, the drive shafts are accelerated and decelerated several times per second. The Brailleprägemodule usually have a male and a female die, which are each arranged on drive shafts one above the other. Between them, the carton is passed through and applied the Braille stamping by rotation of the male and female. For this, it is important that the male and female parts are arranged exactly on top of each other, so that the protrusions in the male part mesh exactly with the recesses of the female part. The tools need to work almost 100% synchronously, otherwise the bumps will not hit the wells exactly, resulting in quality issues with Braille embossing. In order to make the appropriate adjustments to the tools or tool holders, the game between the respective drive shaft and complementary hole in the tool or tool holder on the entire length of the drive shaft would have to be zero, which means Production reasons is very complicated and expensive. Therefore, there will usually always be a match between the two parts. Since the unit, as already mentioned, accelerated and decelerated several times per second, it comes to the non-backlash-free connections to rotational relative movements between the tool or tool holder and the respective drive shaft, resulting in wear on the holes for receiving the drive shaft, so that with increasing play the tools must be exchanged.

The object of the present invention is therefore to provide a device in which the rotary tools or tool holders can be easily adapted or changed simply to the respective sheet format as well as to the respective processing to be performed. This object is achieved by the characterizing features of claim 1.

In an embodiment according to the invention, the device for releasably securing rotary tools or tool holders on a drive shaft therefore has tools or tool holders with a hub having a bore complementary to the outer contour of the drive shaft and at least one clamping device associated with a respective rotary tool or tool holder. The bore has at least two inwardly inclined grooves. Furthermore, the hub is provided at its one end with an external thread. This makes it possible to fasten in the grooves a clamping device in the form of a screw-on clamping jaw for fixing the rotary tool or tool holder on the drive shaft. This device has the advantage that the tool or the tool holder can be attached to the drive shaft without play and on the other repeatedly released and can be moved freely on the shaft.

In a preferred embodiment, the screw-on clamping claw consists of a threaded nut into which a ring can be inserted, on whose outer web two clamping claws are mounted. The ring has the same bore as the hub of the tools or the tool holder. The ring is connected via dowel pins, which are pressed into holes on the peripheral surface of the threaded nut, with the threaded nut. This embodiment has the advantage that on the one hand via the threaded connection the Clamping claws are pressed into the oblique grooves of the hub bore until a backlash-free connection is made, and on the other hand, the clamping claws on the dowel pins that take the ring when the threaded nut is released, a simple and secure solution of the connection is possible.

In a further preferred embodiment, the threaded nut on its outer end face on holes for inserting a Zweilochmutterdrehers. As a result, a simple movement of the threaded nut is possible.

In a particularly preferred embodiment, the drive shaft is a shaped shaft, for.

B. executed as a polygon shaft, hexagonal shaft or splined shaft. This embodiment has the advantage that, for example, in the case of stamping tools in the form of male and female molds, the correct assembly of the two tools meshing with one another is facilitated with respect to a round shaft.

In a further preferred embodiment, the device is used in corresponding modules for processing sheet-like materials which are used, for example, for creasing, cutting or embossing. In this case, the device proves to be particularly advantageous in modules which have two drive shafts and which are equipped with complementary tools which work together.

In a particularly preferred embodiment, the device is used in a module of a sheet-processing machine, for example a Braille module, in a folding box gluer.

Figur 1

zeigt in einer perspektivischen Darstellung beispielhaft einzelne Bearbeitungsstationen einer Faltschachtelklebemaschine

Figuren 2a, 2b

zeigen ein Bearbeitungsmodul mit Rillwerkzeugen

Figuren 3a, 3b

zeigen ein Bearbeitungsmodul mit Prägewerkzeugen

Figur 4

zeigt eine erfindungsgemäße Vorrichtung im Schnitt

Figur 5

zeigt in einer perspektivischen Darstellung eine erfindungsgemäße Vorrichtung

Figur 6

zeigt in einer perspektivischen Darstellung ein Werkzeug für eine erfindungsgemäße Vorrichtung

Figur 7

zeigt in einer perspektivischen Darstellung eine erfindungsgemäße aufschraubbare Spannklaue

Figuren 8a, 8b

zeigen in einer perspektivischen Darstellung die wesentlichen Einzelteile der aufschraubbaren Spannklaue

The invention will be explained in more detail below with reference to an exemplary embodiment of a braille module of a folding box gluing machine. However, this module in this special processing machine is not intended to limit the invention to this use case. The invention can be generally used for the attachment of rotary tools as a shaft-hub connection.

FIG. 1

shows in a perspective view by way of example individual processing stations a Faltschachtelklebemaschine

FIGS. 2a, 2b

show a processing module with scoring tools

FIGS. 3a, 3b

show a processing module with stamping tools

FIG. 4

shows a device according to the invention in section

FIG. 5

shows a perspective view of a device according to the invention

FIG. 6

shows a perspective view of a tool for a device according to the invention

FIG. 7

shows a perspective view of a screw-on clamping jaw according to the invention

Figures 8a, 8b

show in a perspective view of the essential parts of the screw-on clamping jaw

FIG. 1 shows by way of example for a further processing machine a folding box gluing machine with a plurality of processing stations in which tool receiving devices according to the invention can be used.

The folder gluer starts in FIG. 1 bottom right with an insert 1, which pulls off the blanks to be processed at high speed from a stack one after the other and feeds them individually to the subsequent processing station. Following the insert 1 is followed by an alignment station 4, in which the blanks are individually aligned against a lateral stop. Through the alignment station transversely positionable machine components in the form of two pairs of belts lead as Serve conveyor and can be positioned manually or automatically transversely actuators.

This is followed by a primary crusher 6 and a first folding module 7. The machine components in the form of belt pairs, which can be positioned transversely in the form of belt pairs, both through the primary shredder 6 and through the folding module 7, are transversely positioned with an actuator depending on the type of blank.

On the folding module 7 follows a turning station 9. The turning station 9 includes for rotating the blanks about a vertical axis by 90 ° two parallel juxtaposed conveyor lines whose speed is adjustable separately. The blanks are on both conveyor lines, so that they are rotated at different speeds of the two conveyor lines. The two conveyor lines contain driven rollers as conveying means.

Subsequent to the turning station 9 is followed by a further alignment station 10, which corresponds in its construction of the alignment station behind the insert 1. It thus again contains transversely positionable machine components in the form of pairs of conveyor belts as conveying means.

The next processing station 13 serves to perform box-type dependent processing operations; For example, further score lines are pre-broken or special folds are performed. Also through the processing station 13 lead belt pairs as conveying elements that can be positioned transversely with actuators.

This is followed by a folding station 14, in which the blank parts previously provided with an adhesive seam are folded over by 180 °. The folding station 14 includes pairs of belts as conveying elements and an adhesive applicator, which can be moved by means of actuators in their dependent of the cutting type transverse position. Then follows a transfer station 15, of which the folded, provided with not yet set adhesive seam blanks in all parts exactly aligned the subsequent collection and Pressing device 16 are supplied. In the collecting and pressing device 16, a shingled stream of folded blanks is first formed, which is subsequently held under pressure for some time between conveying press belts, so that the adhesive seams set. The transfer station also contains pairs of belts, which can be transversely adjusted by means of actuators.

In the FIGS. 2a and 2b is a module for synchronous grooves shown with scoring tools. The module has a right frame wall 20 and a left frame wall 21, which are interconnected by transverse members 22, 23, 24. In the frame walls 20, 21, a lower drive shaft 29 is mounted. On the lower drive shaft 29 lower scoring tools 33 are mounted and laterally slidably connected to the lower drive shaft 29 via a lower tool guide element 41, which is supported on the lower cross-beam 24. The FIG. 2a further shows an upper cross-beam 23 and an upper drive shaft 28, both of which are mounted in the frame walls 20, 21. On the upper drive shaft 28 upper scoring tools 32 are mounted and laterally slidably connected to the upper drive shaft 28 via an upper tool guide element 40 which is supported on the upper cross-beam 23. The box blanks 12 are transported between the two illustrated upper scoring tools 32 and the lower scoring tools 33. The upper and lower scoring tools 32, 33 are guided by the tool guide elements 40, 41, which are respectively supported on the transverse members 23, 24 in the manner already described. The two scoring tools 32, 33 shown are only examples; Any number of scoring tools can be arranged on the drive shafts in accordance with the requirement. Also, a mixture of different tools, such as scoring tools, together with embossing tools is possible.

In the FIGS. 3a and 3b a module is shown in an embodiment for synchronous embossing as a so-called Braille module. The carton blanks 12 are transported between the four illustrated upper braille embossing tools, which are designed as male parts 34, and the lower braille embossing tools, which are designed as dies 35. The patrices 34 and matrices 35 are guided by the tool guide elements 40, 41, each on the transverse members 23, 24th supported in the manner already described. As can be seen, the braille tools 34, 35 can be set anywhere on the carton blank. Also, the number of braille tools 34, 35 is arbitrary.

In FIG. 4 an embodiment of the device according to the invention is shown. A rotary tool or a rotary tool holder 50 is fastened on a drive shaft 51 via a screw-on clamping jaw 53. The clamping claw 53 in this case has two clamping claws 54, which are fastened at one end to a common ring 55. The ring is movably fixed in a threaded nut 56 by means of clamping pins 57. At its outer end face 58, the threaded nut 56 holes 59 for inserting a Zweilochmutterndrehers on.

In FIG. 5 this embodiment is shown in a perspective view. The drive shaft 51 is designed as a polygonal shaft. Of the screw-on clamping claw 53, which is screwed onto the hub 52 of the tool holder, only the threaded nut 56 can be seen in this illustration.

From the illustration in FIG. 6 Further details of the structure of the tool or the tool holder 50 are shown. It is clear to see the hub 52, which has a bore 61 complementary to the FIG. 5 has recognizable polygonal shaft as the drive shaft 51. Furthermore, the two grooves 62 are shown, in which the clamping claws 54 are used.

In the FIG. 7 is a screw-on clamping jaw 53 in the assembled state and in the FIGS. 8a and 8b the items are shown. One recognizes the threaded nut 56 and the clamping claws 54, which are fastened to a ring 55. The ring 55 has a bore 61 complementary to the outer contour of the drive shaft 51, in this case a polygonal shaft, and is fixed by means of dowel pins 57 in the threaded nut 56.

Furthermore, in an advantageous embodiment, the ring 55 may have grooves 63 for receiving indexing pins (not shown) on the drive shaft 51, which facilitates correct assembly with pairs of tools.

LIST OF REFERENCE NUMBERS

1

depositors

4

aligner

6

primary crusher

7

folding module

9

turning station

10

aligner

12

A carton blank

13

processing station

14

folding station

15

transfer station

16

Collecting and pressing device

20

right frame wall

21

left frame wall

22

crossbeam

23

upper crossbar

24

lower crossbar

28

upper drive shaft

29

lower drive shaft

32

upper scoring tools

33

lower scoring tools

34

punch

35

die

40

Upper tool guide element

41

lower tool guide element

50

Tool / tool holder

51

drive shaft

52

hub

53

Screw-on clamping claw

54

clamping claw

55

ring

56

threaded nut

57

dowel pin

58

Outer front side of the threaded nut

59

hole

60

external thread

61

drilling

62

groove

63

groove

Claims (8)

1. Device for releasably fixing rotary tools or tool mounts (50) on a drive shaft (51) with rotary tools or tool mounts, wherein the tools or tool mounts (50) have a hub (52) with a bore (61) that is complementary to the outer contour of the drive shaft (51), and with at least one clamping device (53) associated with a respective rotary tool or tool mount,
   characterized in
   that the bore (61) has at least two grooves (62, 63) extending inward at an angle and that on one end, the hub (52) has an outer thread (60) so that a clamping device in the shape of a screw-on clamping claw (53) for fixing the rotary tool or tool mount to the drive shaft may be fixed in the grooves (62, 63).
2. Device according to Claim 1,
   characterized in
   that the screw-on clamping claw (53) includes two clamping jaws (54) attached on one end to a common ring (55) that has a bore corresponding to the outer contour of the drive shaft, the ring insertable into a threaded nut (56) and connectible to the threaded nut via clamping pins (57).
3. Device according to Claim 2,
   characterized in
   that on its outer end face (58), the threaded nut (56) has holes (59) for inserting a pin type face wrench.
4. Device according to any one of the preceding claims,
   characterized in
   that the drive shaft (51) is embodied as a form shaft.
5. Module (13) for processing flat, sheet-shaped material (12), including a device according to any one of the preceding claims,
   characterized in
   that the module includes two drive shafts (28, 29) arranged at a distance to one another and one above the other, and that tools or tool mounts (34) are fixed to one of the drive shafts (28) to cooperate with complementary counter-tools (35) fixed to the second drive shaft (29).
6. Module according to claim 5,
   characterized in
   that the module is equipped with creasing tools or cutting tools or embossing tools.
7. Module according to claim 6,
   characterized in
   that the module is embodied as a Braille embossing module.
8. Machine for processing sheets, in particular folding box gluing machine, folding machine, or cover feeder, including a module according to any one of claims 5 to 7.

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