EP3439881B1 - Gripper carriage, sheet-processing machine comprising a gripper carriage and a radiation dryer, and method for transporting sheets - Google Patents

Description

Gripper car, sheet processing machine with gripper car and radiation dryer and method for transporting sheets
The invention relates to a gripper carriage, a sheet processing machine with a gripper carriage and an integrated radiation dryer and a method for transporting sheets by means of a gripper carriage in the delivery of a sheet processing machine.

The DE 10 2010 001806 A1 discloses a delivery of a sheet processing machine with a gripper carriage movable along a sheet guide. A spoiler element can be assigned to the gripper carriage, which leads to an improvement in the interaction with the incoming air, especially when using a thermal air dryer.

One from the DE 296 16 235 U1 Known sheet delivery supports the sheets with the help of gripper carriages, which are guided on circulating chains along a sheet transport path. The gripper carts clamp the leading edges of the sheets and pull them past the radiation dryer on the sheet transport path.

The US 4,530,495 A. discloses a sheet processing machine with a radiation dryer, wherein a trailing surface of a gripper carriage with a sheet transport plane has an angle of less than 90 ° in order to reduce a non-irradiated area of the sheet.

The EP 0 252 602 A1 discloses a sheet-processing machine with radiation dryer, the gripper carriage having a reflector on its top in order to shade the gripper carriage itself from direct radiation or to reduce heat.

Since the gripper carriages protrude from the plane in which they transport or convey the sheets in the direction of the radiation dryer, they shield at least their front edge area against part of the dryer radiation, in particular when approaching a radiation dryer. Areas of the sheet where the shielding is so intense that it does not allow the ink to dry satisfactorily not be printed, as the color can still be blurred or transferred to other sheets after being displayed or laid out.

The deterioration in drying can result in low abrasion and / or scratch resistance.

Another requirement with steadily increasing machine speeds is a low-mass construction and at the same time a high bending strength, especially in deflection areas, which can be met in particular by special gripper car profiles. Such a gripper carriage profile is, for example, a T-shaped profile, which, however, requires a larger shadow cast on arc areas close to the gripper carriage.

From the DE 103 04 617 A1 a sheet conveyor for a sheet processing machine is known, a gripper bridge being formed in the form of a carrier profile having straps. The gripper bridge can be formed by means of a carrier profile from the group of C, S, double T, U or Z profiles.

The invention has for its object to provide an alternative gripper carriage or an alternative method for transporting sheets in the delivery of a sheet processing machine. An alternative sheet processing machine with a radiation dryer and at least one gripper carriage is also to be created.

According to the invention the object is achieved by a gripper carriage with the features of independent claim 1, a sheet-processing machine with the features of independent claim 12 and a method for transporting sheets in the delivery of a sheet-processing machine with the features of independent claim 14. Advantageous refinements result from the subclaims, the description and the drawings. At this point, all embodiments of the invention disclosed in the claims of the originally submitted documents are explicitly included in the description.

The invention has the advantage that an alternative gripper carriage or an alternative method for transporting sheets in the delivery of a sheet-processing machine is created. An alternative sheet processing machine with a radiation dryer and at least one corresponding gripper carriage is also created.

The advantages are that the reflector deflects part of the dryer radiation, which would be uselessly absorbed by the gripper carriage in the absence of the reflector, onto the front edge of a sheet transported by the gripper carriage. This does not prevent the gripper carriage from shielding the sheet from its radiation before it reaches the radiation dryer. However, as soon as the gripper carriage has passed the radiation dryer, the reflector directs radiation back to the radiation dryer, which has left the radiation dryer with at least one component in the sheet transport direction and would not hit the sheet if the spreading is unimpeded, so that its front edge after the gripper carriage has not hit it shields more, the more intensely irradiated.

In order to be effective over the entire width of the sheets, the reflector should preferably extend continuously over the entire width of the sheet transport path or the sheet transport plane. The reflector should preferably be in section at least in a longitudinal direction of the gripper carriage plane, i. H. be straight in a plane parallel to the front edge of the sheet transported by the gripper carriage, in order to reduce a redistribution of the radiation transverse to the sheet transport direction.

The reflector can also be straight in a sectional plane orthogonal to the front edge; however, a convex or in particular concave curved cross-sectional shape can also be useful here in order to optimize the radiation distribution. In a further embodiment, the reflector can also be designed with a free-form surface. In particular, the reflector can alternately have concave and / or convex regions, for example.

For example, a first segment can also be guided such that it can move in the radial direction. B. with the aid of rails extending in the radial direction.

A particularly simple solution with which a good homogeneous distribution of the radiation dose along the transport path and in particular in or against the transport direction of the sheet can be realized is to align the reflector perpendicular to the sheet transport direction or to a plane spanned by a gripper impact surface.

According to the invention, the reflectivity of the reflector for the radiation from the radiation dryer should be at least 40%, preferably at least 60%, in particular at least 75%. Such reflectivity, in particular the degree of reflection, can be achieved in the ultraviolet (in particular wavelength 220 nm to 400 nm), in particular with an aluminum surface. For example, the reflectivity of an aluminum-coated surface, for example a spring steel sheet, can be approximately 80%.

In order to keep the aluminum surface free of oxide, it should be provided with a protective layer. A protective layer which is impermeable to oxygen and permeable to UV radiation from the dryer can have silicon, in particular quartz. Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

Fig. 1

eine schematische Seitenansicht einer Auslage mit integriertem Strahlungstrockner;

Fig. 2

einen schematischen Querschnitt eines Greiferwagens der Auslage beim Einlauf in den Strahlungstrockner;

Fig. 3

den Greiferwagen unmittelbar unter dem Strahlungstrockner;

Fig. 4

den Greiferwagen beim Passieren des Strahlungstrockners;

Fig. 5

eine Variante des Greiferwagens in einem schematischen Querschnitt;

Fig. 6

einen vier Reflektorelemente aufweisenden Reflektor für einen Greiferwagen für eine Auslage einer mittelformatigen Bogendruckmaschine;

Fig. 7

eine Rückansicht des vier Reflektorelemente aufweisenden Reflektors;

Fig. 8

eine Rückansicht eines Greiferwagens mit einem fünf Reflektorelemente aufweisenden Reflektor für eine Auslage einer großformatigen Bogendruckmaschine;

Fig. 9

einen Schnitt des Greiferwagens gemäß vorheriger Figur;

Fig. 10

einen Schnitt durch einen Reflektor mit Schraubverbindung;

Fig. 11

die Reflektorelemente des Reflektors für einen Greiferwagen einer großformatigen Bogendruckmaschine;

Fig. 12

die Reflektorelemente des Reflektors mit Schraubverbindungen.

Show it:

Fig. 1

a schematic side view of a delivery with integrated radiation dryer;

Fig. 2

a schematic cross section of a gripper carriage of the delivery when entering the radiation dryer;

Fig. 3

the gripper carriage directly under the radiation dryer;

Fig. 4

the gripper carriage as it passes the radiation dryer;

Fig. 5

a variant of the gripper carriage in a schematic cross section;

Fig. 6

a reflector having four reflector elements for a gripper carriage for a delivery of a medium-sized sheet-fed printing machine;

Fig. 7

a rear view of the reflector having four reflector elements;

Fig. 8

a rear view of a gripper carriage with a reflector having five reflector elements for a delivery of a large-format sheet printing machine;

Fig. 9

a section of the gripper carriage according to the previous figure;

Fig. 10

a section through a reflector with screw connection;

Fig. 11

the reflector elements of the reflector for a gripper carriage of a large-format sheet-fed printing machine;

Fig. 12

the reflector elements of the reflector with screw connections.

Fig. 1 shows a side view of a delivery 01 and parts of a last printing unit 02 of a sheet-processing machine, for. B. a sheetfed press, here a sheetfed offset press, preferably in unit and series construction. A printing cylinder 11 of the printing unit 02 transfers a sheet 22, after a last printing ink has been applied to the sheet 22 in contact with a blanket cylinder, not shown, to a sheet transport system 12 of the delivery 01. Alternatively, another work, for example a coating unit, can also be used Hand sheet 22 to delivery 01 or sheet transport system 12. The sheet transport system 12 comprises two endless chains 13, which are deflected on chain wheels 14, 15. Chain guides arranged on the side frames of the delivery 01 lead a lower and an upper run 16, 17 of the chains 13 in each case on a curved path, which initially rises obliquely from the chain wheel 14 to the chain wheel 15 and then merges into a horizontal path via a delivery stack 18. Alternatively, the deflection areas for the chains 13 can also be formed by deflection guides. Gripper carriages 19 are mounted on the chains 13 at regular intervals as holding tools. The gripper carts 19 each comprise an elongated gripper car body 20 which is elongated and fastened to both chains 13 (see, for example, the direction of travel of the chains 13 of the lower run 16). Fig. 2 ) and along an edge of the gripper carriage 19 movable gripper fingers 21, which are provided to clamp the front edge of a sheet 22 printed thereon on the gripper carriage 19 and the sheet 22 in a sheet transport plane or along a sheet transport path 23, which here follows the course, on the printing cylinder 11 of the lower strand 16 corresponds to the delivery stack 18 and release it there. The sheet transport path 23 can, for example, run along sheet guide elements, for example sheet guide plates.

When the sheet 22 passes through the sheet transport path 23 in the sheet transport direction 29, its side printed on the printing cylinder 11 is at the top. Facing this side, there is at least one radiation dryer 24 between the runs 16, 17 arranged. The radiation dryer 24 comprises at least one radiation source 25, which preferably extends over the entire width of the sheet transport plane or sheet transport path 23 from one chain 13 to the other, wherein in FIG Fig. 1 For example, three radiation sources 25 are shown. Since the number of radiation sources 25 is of no importance for the effect of the invention, is in the 2 to 5 only one is shown for the sake of simplicity.

As an alternative or in addition to the arrangement of the radiation dryer 24 in the sheet riser for curing printing inks, the arrangement of a radiation dryer 24 can be carried out in a delivery extension. This delivery extension can be used to form a paint path after a last work, for example a coating or printing unit 02. The reflectors 27 (see below) on the gripper carriage 19 can also be used, for example, for paints, in particular UV paints. These can also be used for digital printing inks, in particular UV digital printing inks.

The radiation dryer 24 or the radiation source 25 preferably delivers UV radiation which is able to bring about a chemical drying reaction in the color and / or lacquer printed on the sheet 22. A visible or infrared or microwave radiation source is also suitable for physical drying. The radiation source 25, in particular the UV radiation source 25, can in particular be designed as a mercury discharge lamp in the form of a tube elongated transversely to the sheet transport direction 29 or as an arrangement of UV LEDs on a support extending transversely to the sheet transport direction 29. The mercury discharge lamp essentially emits around its axis approximately in all directions with the same intensity and is therefore usually combined with a reflector which limits its emission on average across the axis to an angular range α; due to their design, the LEDs only emit in such a limited angular range a. For example, the angular range α can be approximately 120 ° amount and / or a gripper carriage 19 can be guided at a vertical distance between the radiation source 25 and the gripper carriage body 20 of approximately 10 mm below the radiation source 25.

If like in Fig. 2 shown a gripper carriage 19 approaches the radiation source 25, it simultaneously shadows a front edge region 26 of the sheet 22, which it pulls behind it. This edge region 26 becomes narrower the closer the gripper carriage 19 comes to the radiation source 25, at the same time the radiation intensity to which the sheet 22 is exposed beyond the shaded edge region 26 becomes ever higher. The total radiation dose that the sheet 22 has received until its leading edge reaches that in Fig. 3 position shown has reached maximum approach to the radiation source 25, therefore decreases from the rear to the front edge.

In order to correct this unequal distribution, a reflector 27 is preferably arranged, in particular mounted, on a flank 07 of a wall of the gripper carriage 19 trailing with respect to the sheet transport direction 29, in particular on a flank 07 or surface of the gripper carriage 19 oriented counter to the sheet transport direction 29. The reflector 27 can be a flat strip that extends along the gripper carriage 19, preferably over the entire length of the gripper carriage 19 or the radiation source 25. The reflector 27 preferably extends over at least 80% of the width of the gripper carriage body 20 of the gripper carriage 19 and / or over a width that is defined by the two outside gripper fingers 21 of the gripper carriage 19 and / or the maximum width of a sheet 22 to be processed. It can be formed by a mirror polished sheet; it preferably comprises a metal layer, in particular made of aluminum, applied, in particular vapor-deposited, to a flat substrate, and particularly preferably a protective layer, for example made of quartz, which covers the metal layer in an airtight manner. Such a reflector 27 has a reflectivity for the radiation from the drying radiator 24, in particular for the UV radiation from the UV radiation source 25, of at least 40%, in particular at least 60%, preferably at least 75%. The reflectivity in the vicinity of the emitted wavelength is particularly preferably 80%.

An alternative is still (equivalent to the dichroic reflectors) applied layer stacks on hafnium oxide and silicon oxide. The thickness of the layers corresponds to a reflection in a certain wavelength range. The more layers of a certain thickness were applied, the higher the reflectance. The layer system can then be constructed in such a way that not only UV radiation and light (for curing) are reflected (such as a dichroic reflector in the UV module), but also IR radiation is reflected. This prevents the gripper carriage 19 from heating up with IR radiation. However, both variants are possible.

A part of the gripper carriage 19, in particular part of the gripper carriage body 20, can also be formed as the reflector 27. Here, for example, a surface of the gripper carriage 19, in particular the gripper carriage body 20, is designed with low roughness. This can be done, for example, by mechanical processing and / or coating. The coating in particular is optimized not only to reduce the roughness but also for more reflection. The reflection property is particularly dependent on the material, for example chromium may be unsuitable. For example, the reflector 27 can be designed as an adhesive tape, in particular as an aluminum adhesive tape.

The reflector 27 can extend in one piece or in several parts along the gripper carriage body 20 transversely to the sheet transport direction 29. To secure it, screw holes can be distributed along the reflector 27; further openings, which, however, should only take up a small part of the reflector surface, can be provided for sensors which are used, for example, to check the correct position and / or drying of the sheet 22 on the gripper carriage 19. Alternatively or additionally, the reflector 27 can also be clamped and / or glued for fastening. A flat surface of the reflector 27 or the reflector surface preferably forms a reflector plane 28. In the embodiment shown here, the reflector 27, in particular the reflector plane 28, is at least approximately perpendicular to the sheet transport direction 29 or perpendicular to the sheet transport plane or perpendicular to the sheet 22 or perpendicular to a plane spanned by a gripper impact surface 35 (see below). Deviations from this orientation are possible, but should not exceed 30 °. The reflector plane 28 can be understood, for example, as a spatial plane that is spanned by the surface of the reflector 27.

The moment that the reflector 27 the in Fig. 3 shown position of maximum approach to the radiation source 25, its reflecting surface is struck by its radiation. The portion of the radiation which strikes the reflector 27 has left the radiation source 25 with a component in the transport direction 29 of the sheet 22 and, if it had not been reflected, would have passed the sheet transport plane or the sheet transport path 23 in front of the leading edge of the sheet 22 or the gripper car 19 would not have been used. This portion is additionally available thanks to the reflector 27 and is reflected on those areas of the arc 22 which were previously shadowed. The additional dose thus obtained is highest, particularly in the area of the base of the reflector 27, where the arc 22 was previously longest and most intensely shadowed. In this way, a uniform distribution of the radiation can be achieved over almost the entire length and / or width of the sheet 22, and the sheet 22 can be printed or lacquered at least approximately up to directly to its front edge without fear of inadequate drying.

If the reflectivity of a vertically positioned reflector 27 arranged over the entire surface were exactly 100%, then this could exactly compensate for the shading by the gripper carriage 19 in the case of a symmetrical radiation source 25. To the To compensate for reflection losses, it would be conceivable for the reflector 27, as in FIG Fig. 5 outlined, designed to be concavely curved in section transversely to the longitudinal direction of the gripper carriage 19 in order to achieve a concentration of the reflected radiation. In particular, the reflector 27 is arranged such that its reflector plane 28 or a tangent 28 applied to a curved reflector 27 and the sheet transport plane or a plane spanned by a gripper impact surface 35 intersect. An extension of the mirror surface of the reflector 27 is in particular essentially perpendicular and preferably transverse to the sheet transport direction 29 on the plane spanned by the gripper impact surface 35.

Furthermore, by a forward inclination of the reflector 27, as in Fig. 5 shown, in which a tangent 28 applied to the curved reflector surface spans an obtuse angle β with the arch 22, the radiation is predominantly reflected in a region of the arch 22 not directly adjacent to the reflector 27. Although no uniform distribution of the radiation dose on the sheet 22 is achieved up to the base of the reflector 27, the limit up to which sufficient drying is achieved can be placed closer to the gripper carriage 19 and thus the printable area of the sheet 22 is enlarged become. In particular, the reflector 27 can therefore be arranged in such a way that the angle β between the reflector plane 28 or an approximately center line to its tangent 28 applied to a curved reflector 27 and an arc 22 or an arc perpendicular to a gripper impact surface 35 or the arc 22 of a gripper impact surface 35 spanned plane be blunt, in particular between 91 ° and 120 °, preferably at least approximately 93 °. In the case of a free-form surface, at least regions of the reflector 27 are arranged accordingly. The angle β could also be made acute. Then the radiation would be reflected more towards the beginning of the arc. Here, the angle β can be, for example, between 60 ° and 89 °.

The Fig. 6 shows a reflector 27, in particular having four reflector elements 27.1, 27.2, 27.3, 27.4, for a gripper carriage 19, preferably for a delivery of a medium-format sheet-fed printing press, for example. A medium format sheet-fed printing machine can process a sheet width of at least approximately 105 cm, for example. The reflector elements 27.1, 27.2, 27.3, 27.4 can each have a polished surface, for example of a spring steel sheet coated with aluminum (Al) and silicon dioxide (SiO2). In particular, the reflection of the reflector 27 or the reflector elements 27.1, 27.2, 27.3, 27.4 is optimized for a wavelength of approximately 220 nm to 500 nm. It can also be optimized for LED UV with a peak at a wavelength of 385 nm , The reflector elements 27.1, 27.2, 27.3, 27.4 can also have an uncoated surface in the area of fixing elements, for example on bores, for example of approximately 15 mm in diameter. The reflectance of the reflector elements 27.1, 27.2, 27.3, 27.4 is for simple stainless steel sheets at 200 nm> = 40%, at 225 nm> = 50%, at 250 nm> = 65% and at 275 to 500 nm> = 75%. Preferred aluminum-coated surfaces each have higher values.

The reflector 27, in particular the reflector elements 27.1, 27.2, 27.3, 27.4, are assigned to a flank 07 or surface of the wall of the gripper carriage 19 trailing with respect to the sheet transport direction 29. The trailing flank 07 is accordingly a flank or surface of the gripper carriage 19 facing the sheet 22 to be transported. The trailing flank 07 of the wall can, for example, merge continuously or discontinuously into an adjacent surface which comprises the surface of the gripper carriage 19 facing away from the sheet transport plane or forms, which can be further connected to the leading edge of the gripper carriage 19. The wall can also be formed by a cladding of the gripper carriage 19. The trailing flank 07 can in particular be arranged on a side of the wall facing away from a gripper shaft 09, in particular a gripper carriage body 20 or a carrier body 20, and / or at least approximately parallel to it Normals of the sheet transport plane or a surface aligned by a gripper impact surface 35.

The reflector 27 preferably has at least two, here in particular exactly four, reflector elements 27.1, 27.2, 27.3, 27.4 reflecting radiation. These reflector elements 27.1, 27.2, 27.3, 27.4, which are in particular spaced apart, are arranged transversely to the sheet transport direction 29 or parallel to the sheet front edge. The four reflector elements 27.1, 27.2, 27.3, 27.4, in particular transverse to the sheet transport direction 29, are each assigned to the trailing flank 07 or surface of the wall of the gripper carriage 19. In particular, several or all of the reflector elements 27.1, 27.2, 27.3, 27.4 lie in a common plane or the reflector elements 27.1, 27.2, 27.3, 27.4 are arranged in this common plane. A surface of the reflector 27 or the surfaces of several or all reflector elements 27.1, 27.2, 27.3, 27.4 together form a reflector plane 28. The reflector plane 28 can be understood as a spatial plane.

In the case of a reflector 27 having a plurality of reflector elements 27.1, 27.2, 27.3, 27.4, these reflector elements 27.1, 27.2, 27.3, 27.4 are preferably arranged adjacent to one another by means of abutting edges 30. The reflector elements 27.1, 27.2, 27.3, 27.4 are arranged at a distance a from one another, which can preferably be 0.1 mm to 5 mm. The reflector elements 27.1, 27.2, 27.3, 27.4 are particularly preferably arranged at a distance a from one another which is at least approximately 1.5 mm. The reflector 27 or the reflector elements 27.1, 27.2, 27.3, 27.4 can also have recesses 33 which, for example, can also be arranged in the region of the abutting edges 30 between the reflector elements 27.1, 27.2, 27.3, 27.4.

In particular, the spaced-apart reflector elements 27.1, 27.2, 27.3, 27.4 can be from the normal of the sheet transport plane or from a plane spanned by a gripper impact surface 35, ie from the orthogonal to the Sheet transport path 23 have different abutting edges 30. These abutting edges 30 of the reflector elements 27.1, 27.2, 27.3, 27.4 are in particular aligned parallel to one another and are preferably arranged in a common plane such that they are in each case at an angle of 1 ° to 45 ° to the normal or to the orthogonal of the sheet transport plane or the Sheet transport path 23 are formed. It is particularly preferred that at least two and here particularly preferably all reflector elements 27.1, 27.2, 27.3, 27.4 are formed with mutually facing abutting edges 30 at an angle to the normal of the sheet transport plane of at least approximately 20 °. Preferably, the reflector 27, in particular the two outer reflector elements 27.1, 27.4, which are arranged facing the chains 13, each have an outer outer edge 31 oriented at least approximately parallel to the normal of the sheet transport plane or the plane spanned by a gripper impact surface 35.

The Fig. 7 shows a rear view of the reflector 27, in particular having four reflector elements 27.1, 27.2, 27.3, 27.4, from the fastening side. Each reflector element 27.1, 27.2, 27.3, 27.4 preferably has at least and particularly preferably exactly two fixing elements, by means of which a respective reflector element 27.1, 27.2, 27.3, 27.4 can be assigned directly or indirectly to the wall of a gripper carriage 19. The fixing elements can in particular be designed as screw connections 32. A respective screw connection 32 can be formed by a screw, for example of size M6 x 16, and nut, which is assigned directly or indirectly to the wall of the gripper carriage 19. The wall of the gripper carriage 19 can be formed, for example, by a gripper carriage body 20 or a carrier body 20 or carrier beam, which is in particular formed transversely to the sheet transport direction 29. In this case, the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4 is assigned to a flank 07 of the gripper carriage body 20 or the carrier body 20 trailing with respect to the sheet transport direction 29.

The Fig. 8 shows a rear view of a gripper carriage 19 with a reflector 27, in particular having five reflector elements 27.1, 27.2, 27.3, 27.4, 27.5, preferably for a delivery of, for example, a large-format sheet-fed printing machine. For example, a large-format sheet-fed printing machine can process a sheet width between at least approximately 145 cm and 205 cm. The reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 is designed in particular for reflection of ultraviolet radiation or for a wavelength range from 220 nm to 500 nm. For example, the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can be designed as described above.

The gripper carriage 19 is designed to transport a sheet 22 in the sheet transport direction 29 in a sheet transport plane along the sheet transport path 23. The gripper carriage 19 has a wall, the reflector 27 being associated with a trailing flank 07 of the wall with respect to the sheet transport direction 29. The gripper carriage 19 preferably contains a carrier body 20, in particular in one piece, which can preferably be arranged or arranged on both sides via labels 03 on the chains 13 of the chain transport system 12, which is not shown in any more detail. The gripper carriage 19 can be held and / or guided on both sides by two bolts 04 assigned to the plates 03 and spaced apart from one another in the sheet transport direction 29. The bolts 04 can in particular be part of the chains 13 of the sheet transport system 12. The gripper carriage 19 preferably also carries a roller lever 05 on one or both sides, to which a cam roller 06 can be assigned. The gripper fingers 21 of the gripper carriage 19 can be controlled by means of control means, for example control cams, for clamping and releasing a sheet 22. The gripper fingers 21 can be controlled via the control means, in particular control cams, and the roller levers 05, each of which preferably carries a cam roller 06, in particular for sheet acceptance and release.

The reflector 27 preferably has at least two, in particular exactly five, radiation-reflecting reflector elements 27.1, 27.2, 27.3, 27.4, 27.5. These reflector elements 27.1, 27.2, 27.3, 27.4, 27.5, which are in particular spaced apart, are arranged transversely to the sheet transport direction 29 or parallel to the sheet front edge. In particular, the reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 are each assigned to the wall, in particular the carrier body 20, of the gripper carriage 19 transversely to the sheet transport direction 29. In particular, several or all reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 lie in a common plane or the reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 are arranged in this common plane. Furthermore, the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can have at least one recess 33 for assembly, adjustment, maintenance and / or cleaning work on the gripper carriage 19.

The Fig. 9 shows a section of the gripper carriage 19 according to the previous figure. The gripper carriage 19 here has in particular a T-shaped support body 20 which is arranged transversely to the sheet transport direction 29 or parallel to the front edge of the sheet and in particular forms the wall here. The flank 07 trailing with respect to the sheet transport direction 29 is assigned the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5. The trailing flank 07 can thus be understood as the rear flank or rear surface of the gripper carriage 19.

The gripper carriage 19 has a gripper shaft 09 transversely to the sheet transport direction 29, which interacts with gripper fingers 21 which are axially spaced apart. The gripper shaft 09 is thus arranged downstream of the wall, in particular of the carrier body 20, with respect to the sheet transport direction 29. The gripper shaft 09 is accordingly assigned to the leading flank of the wall, in particular the largely one-piece support body 20. Transverse to the sheet transport direction 29, the gripper carriage 19 has at least one gripper impact 08, which is connected to a movable gripper fingers 21 each form a clamping gap. An at least partially continuous bar with at least one gripper impact surface 35 can be used as the gripper impact 08. Preferably, however, several individual gripper serves 08 with respective gripper contact surfaces 35 are used. The at least one gripper impact surface 35 or the gripper impact surfaces 35 span a plane which can correspond, for example, to the surface of the sheet 22 in the horizontal sheet transport path 23. The gripper cuffs 08 are assigned to the carrier body 20 in the region of the sheet transport path 23.

The gripper shaft 09 is operatively connected at the end to the roller levers 05 provided. When the roller lever 05 carrying the cam roller 06 is actuated, preferably by control means, the gripper fingers 21 can be controlled with respect to the gripper cuffs 08. The gripper shaft 09 can actuate or move the gripper fingers 21 directly or via translation means and thus release the gripper fingers 21 from the gripper cuffs 08. The gripper fingers 21 are preferably pressed during one sheet transport by one or more spring elements, for example a torsion spring 10, against the gripper supports 08 of the gripper carriage 19. For example, the gripper carriage 19 can have a height of at least approximately 72 mm perpendicular to the plane spanned by the gripper impact surfaces 35 and the extension of the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 at least perpendicular to this plane approximately 63 mm.

At least the wall trailing with respect to the sheet transport direction 29 is preferably arranged at least approximately perpendicular to the sheet transport plane or to the sheet transport path 23 and / or transversely to the sheet transport direction 29. Accordingly, the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 is preferably at least approximately perpendicular to the sheet transport plane or to the sheet transport path 23 and / or transverse to Sheet transport direction 29 arranged aligned. The wall can be part of a gripper carriage body 20 or the carrier body 20 of the gripper carriage 19, for example. In particular, the wall can have a protrusion that is spaced from the sheet transport plane or sheet transport path 23 and / or facing away from the sheet transport direction 29. In the area of the sheet transport plane, the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 is arranged, for example, flush with the wall, in particular with the support body 20. The reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can extend from at least approximately the sheet transport plane to the protrusion of the carrier body 20. The projection of the carrier body 20 can also protrude beyond the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 against the sheet transport direction 29.

A surface of the reflector 27 or the surfaces of several or all reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 together form a reflector plane 28. The reflector plane 28 can be understood as a spatial plane. The reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 assigned to the trailing flank 07 of the wall, in particular the support body 20, preferably have a common reflector plane 28, which forms an arc 22 gripped by the gripper carriage 19 or to the plane spanned by the gripper impact surfaces 35 includes an angle β. For example, the angle β between the reflector plane 28 and the arc 22 or the spanned plane can be between 60 ° and 120 °. The angle β enclosed between the reflector plane 28 and an arc 22 or spanned plane is particularly preferably obtuse, that is to say formed between 91 ° and 120 °. In particular, the angle β between the reflector plane 28 and the arc 22 or the spanned plane is at least approximately 93 °. Furthermore, adjustment means can also be assigned to the gripper carriage 19, for example for displacing the reflector 27 or one or both of the outer reflector elements 27.1, 27.4, 27.5 Influencing or optimization of the reflected drying radiation. Furthermore, at least one sensor for assessing the position and / or the degree of drying of a sheet 22, 26 could also be provided, possibly in conjunction with a control device.

The Fig. 10 shows a section through a reflector 27 with a fixing element, in particular a screw connection 32, for example as described above. The reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can be indirectly or directly assigned to the wall, in particular the support body 20. For example, the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can be assigned to the wall, in particular the support body 20, via a spacer 34. The spacing means 34 assigned to the fixing element, in particular the screw connection 32, can be made inelastic or metallic, for example, for fixing the position. The spacing means 34 arranged at a distance from the fixing element can be designed, for example, as damping means. In particular, a felt element can be used as a damping means. The damping means, in particular a felt element, can be associated with the trailing flank 07 and / or the reflector 27 with adhesive on one or both sides.

The reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can also be assigned to the wall by means of an adhesive connection. The reflector 27 can also extend continuously over the entire width of the sheet transport path 23. The reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can preferably comprise an aluminum layer. Furthermore, a protective layer can be provided over the aluminum layer. The protective layer can preferably have silicon or quartz.

The Fig. 11 shows reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 of a reflector 27 for a gripper carriage 19, in particular for a large-format sheet-fed printing machine. The Reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 are arranged at a distance a from one another and have fixing elements. The reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 are preferably arranged adjacent to one another by means of abutting edges 30. In particular, the reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 are arranged at a distance a from one another, wherein the distance a can be, for example, 0.1 mm to 5 mm. The reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 are particularly preferably arranged at a distance a from one another which is at least approximately 1.5 mm.

In particular, the reflector 27 can have spaced-apart reflector elements 27.1, 27.2, 27.3, 27.4, 27.5, which are separated from the normal of the sheet transport plane or a plane spanned by the gripper impact surfaces 35, ie. H. have abutting edges 30 from the orthogonal to the sheet transport path 23. These abutting edges 30 of the reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 are in particular aligned parallel to one another and are preferably arranged in a common plane in such a way that they are each at an angle of 1 ° to 45 ° to the normal to the sheet transport plane or the spanned plane are trained. Preferably at least two and particularly preferably all reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 with mutually facing abutting edges 30 are formed at an angle to the normal of the sheet transport plane of at least approximately 10 °. The reflector 27 or an outer reflector element 27.1, 27.5 each has an outer outer edge 31 which is oriented at least approximately parallel to the normal of the spanned plane. Furthermore, the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can have one or more recesses 33, which can also be assigned to a butt edge 30 and / or outer edge 31.

The Fig. 12 shows the reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 of the reflector 27 with fixing elements from the side to be fixed. Preferably, the reflector 27 or a or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can be assigned to the wall, in particular the support body 20, by means of a screw connection 32. The reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 has at least and preferably exactly two fixing points or fixing elements, in particular in such a way that these fixing points or fixing elements are spaced apart from one another transversely to the sheet transport direction 29. A respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 is preferably held by two screw connections 32 spaced apart from one another transversely to the sheet transport direction 29.

The reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 are assigned, for example, spacing means 33, which for example can be assigned to the fixing elements, in particular screw connections 32, and / or can be arranged separately. Here, the spacing means 33 assigned to the screw connections 32 are, for example, steel washers. The spacing means 33, which are spaced apart from the screw connections 32, can in particular be designed as damping means, for example, as adhesive-associated felt elements. Alternatively, the reflector 27 can be designed as an adhesive tape and can be assigned to the wall, in particular a gripper carriage body 20 or carrier body 20. The gripper carriage 19 can also have a gripper carriage body 20 which can be coated in the region of the reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5. The reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 can also be part of the gripper body 20.

A sheet-processing machine preferably has at least one radiation dryer 24, 25 arranged on the sheet transport path 23 and at least one and preferably a plurality of gripper carriages 19. The gripper carriage (s) 19 transport a respective sheet 22 in the sheet transport direction 29 along the sheet transport path 23, the gripper carriage 19 preferably being of the same design are. The gripper carriages 19 preferably each have a reflector 27 assigned to a wall, in particular a gripper carriage body 20 or carrier body 20, or one or more reflector elements 27.1, 27.2, 27.3, 27.4, 27.5 for the radiation emitted by the radiation dryer 24, 25. In particular, the reflectors 27 are assigned to a respective flank 07 of the wall trailing with respect to the sheet transport direction 29, in particular the gripper body 20 or carrier body 20, of a respective gripper carriage 19 in such a way that the latter radiates the radiation which the radiation dryer 24, 25 has at least one component in the Leaves sheet transport direction 29, reflected against the sheet transport direction 29. The gripper carriages 19 can also each have a projection which is spaced and / or turned away from the sheet transport plane or from the sheet transport path 23, which protrudes the front edge region 26 of the sheet 22 gripped by the gripper carriage 19 vertically below the radiation dryer 24, 25 in front of that of the radiation dryer 24, 25 emitted radiation shades. The reflector 27 or one or a respective reflector element 27.1, 27.2, 27.3, 27.4, 27.5 has a reflectivity of at least 40%, in particular at least 60%, preferably at least 75%, for the radiation from the radiation dryer 24, 25. A preferably used spring steel sheet, which is coated with aluminum and provided with a silicon protective layer, can achieve a reflectivity of approximately 80%. During the transport of sheets 22 in the delivery of a sheet processing machine through a respective gripper carriage 19, the radiation emitted by the radiation dryer 24, 25 is directed onto the sheet 22 transported by the gripper carriage 19. The radiation emitted by the radiation dryer 24, 25 is directed in particular directly and / or directly onto the sheet 22 gripped by the gripper carriage 19. In particular, the radiation emitted by the radiation dryer 24, 25 is directed onto the front edge region 26 of the sheet 22 gripped by the gripper carriage 19, so that this front edge region 26 undergoes increased drying.

LIST OF REFERENCE NUMBERS

01

display

02

printing unit

03

sign

04

bolt

05

roller lever

06

follower

07

trailing edge

08

gripper

09

gripper shaft

10

torsion spring

11

pressure cylinder

12

Sheet transport system

13

Chain

14

Sprocket

15

Sprocket

16

Run, lower

17

Run, upper

18

delivery pile

19

gripper carriages

20

Grab car body, carrier body

21

gripper fingers

22

arc

23

sheet transport path

24

radiation dryer

25

UV radiation source, radiation source

26

Front margin

27

reflector

27.1

reflector element

27.2

reflector element

27.3

reflector element

27.4

reflector element

27.5

reflector element

28

Reflector level, tangent

29

Sheet transport direction

30

impact edge

31

outer edge

32

screw

33

recess

34

spacer

35

Gripper surface

α

angle range

β

angle

a

distance

Claims (15)

1. A gripper carriage for transporting a sheet (22) in a sheet transport direction (29) along a sheet transport path (24, 25),
   wherein at least one radiation dryer (24, 25) is arranged on the sheet transport path (23),
   wherein the gripper carriage (19) has a wall (20) and a reflector (27), characterized in
   that the reflector (27) is associated with a flank (07) of the wall (20) that is trailing in relation to the sheet transport direction (29) and
   that the reflector (27) has a reflectivity of at least 40% for the radiation of the radiation dryer (24, 25).
2. The gripper carriage according to claim 1,
   characterized in
   that the reflector (27) has at least two or exactly two, three, four, five or more reflector elements (27.1, 27.2, 27.3, 27.4, 27.5,) at a distance from one another transverse to the sheet transport direction (29).
3. The gripper carriage according to claim 1 or 2,
   characterized in
   that the reflector has reflector elements (27.1, 27.2, 27.3, 27.4, 27.5,) at a distance from one another, wherein protruding edges (30) of the reflector elements transverse to the sheet transport direction (29) deviate from a normal of a plane tensioned by a gripper impact surface (35).
4. The gripper carriage according to claim 1 or 2 or 3,
   characterized in
   that the reflector (27) or a reflector element (27.1, 27.2, 27.3, 27.4, 27.5,) is associated with the wall (20) via a distancing means (34) or a damping means.
5. The gripper carriage according to claim 1, 2, 3 or 4,
   characterized in
   that the reflector (27) or a reflector element (27.1, 27.2, 27.3, 27.4, 27.5,) is associated with the wall (20) by means of an adhesive joint or the reflector (27) designed as an adhesive band is associated with the wall (20).
6. The gripper carriage according to claim 1, 2, 3, 4 or 5,
   characterized in
   that the reflector (27) or a reflector element (27.1, 27.2, 27.3, 27.4, 27.5,) is designed for a reflection of ultraviolet radiation or for a wavelength range of 220 nm to 500 nm.
7. The gripper carriage according to claim 1, 2, 3, 4, 5 or 6,
   characterized in
   that the reflector (27) or a reflector element (27.1, 27.2, 27.3, 27.4, 27.5,) has at least one recess (33) for assembly, setup, maintenance and/or cleaning work on the gripper carriage (19).
8. The gripper carriage according to claim 1, 2, 3, 4, 5, 6 or 7,
   characterized in
   that an angle (β) between a reflector plane (28) or a tangent (28) placed approximately centrally to its perpendicular extension in relation to a gripper impact surface (35) on a curved reflector (27) or a curved reflector element (27.1, 27.2, 27.3, 27.4, 27.5,) and a sheet (22) or a plane tensioned by a gripper impact surface (35) is obtuse or lies between 91° and 120° or amounts to at least approximately 93°.
9. The gripper carriage according to claim 1, 2, 3, 4, 5, 6, 7 or 8,
   characterized in
   that the reflector (27) or a reflector element (27.1, 27.2, 27.3, 27.4, 27.5,) has spring sheet steel.
10. The gripper carriage according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9,
    characterized in
    that the reflector (27) or a reflector element (27.1, 27.2, 27.3, 27.4, 27.5,) comprises an aluminum layer and/or has a protective layer over an aluminum layer.
11. The gripper carriage according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10,
    characterized in
    that the gripper carriage (19) has a gripper carriage body (20) and this gripper carriage body (20) is coated in the region of the reflector (27) or a reflector element (27.1, 27.2, 27.3, 27.4, 27.5,) or the reflector (27) or a reflector element (27.1, 27.2, 27.3, 27.4, 27.5,) is part of the gripper carriage body (20).
12. A sheet-processing machine comprising at least one radiation dryer (24, 25) arranged on a sheet transport path (23) and at least one gripper carriage (19), wherein the gripper carriage (19) is guided along the sheet transport path (23) for the transporting of a sheet (22) in a sheet transport direction (29) and
    wherein the gripper carriage (19) has a wall (20) and a reflector (27),
    characterized in
    that the reflector (27) is associated with a flank (07) of the wall (20) such that this radiation, which exits the radiation dryer (24, 25) with at least one component in the sheet transport direction (29), reflects against the sheet transport direction (29) and
    that the reflector (27) has a reflectivity of at least 40% for the radiation of the radiation dryer (24, 25).
13. The sheet-processing machine according to claim 12,
    characterized in
    that the gripper carriage (19) has a protrusion at a distance from and/or averted from a gripper impact surface (35) which covers a front edge region (26) of the sheet (22) gripped by the gripper carriage (19) vertically beneath the radiation dryer (24, 25) from the radiation emitted by the radiation dryer (24, 25).
14. A method for transporting sheets in the delivery unit of a sheet-processing machine comprising at least one radiation dryer (24, 25) arranged on a sheet transport path (23) and at least one gripper carriage (19),
    wherein the gripper carriage (19) is guided along the sheet transport path (23) for transporting a sheet (22) in a sheet transport direction (29) and
    wherein the gripper carriage (19) has a reflector (27) for the radiation emitted by the radiation dryer (24, 25),
    characterized in
    that the reflector (27) directs radiation emitted from the radiation dryer (24, 25) to the sheet (22) transported by the gripper carriage (19) and
    that the reflector (27) has a reflectivity of at least 40% for the radiation of the radiation dryer (24, 25).
15. The method according to claim 14,
    characterized in
    that the reflector (27) directs radiation emitted from the radiation dryer (24, 25) to a front edge region (26) of the sheet (22) gripped by the gripper carriage (19).

Images