DE2219403A1 - PRINTING DEVICE - Google Patents

Description

The invention relates to a printing device, in particular for multi-color printing, and to one in such a device usable sealing plate and a hydraulic fluid distribution plate. In particular, the invention relates to a device for deep drvickver driving, with the help of which the liquid material used for printing, such as a printing ink, printing ink, or adhesive, through the entire gravure plate is pressed through. It has been proposed for such a device to use the back of the printing plate to equip one or more distribution channels, each channel having different parts through the plate of the recessed sexton located on the pressure surface of the plate. When colored differently Materials used for printing are introduced into different channels, those will be in communication with these channels standing parts of the print cluster in these different

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printed in common colors. An apparatus having such a construction will hereinafter be referred to simply as "the printing apparatus of the described type ".

Since the material used for printing, such as a printing ink, is generally transferred to the plate with the application of pressure problems arise with regard to the sealing of the channels located on the back of the pressure plate. These Sealing must be carried out to prevent an overflow of printing ink of a certain shade from one fanal and another, A channel containing printing ink of a different shade, as well as a drainage of the Drudii.arbe from the border to prevent the rear surface of the plate.

According to the invention, these problems are outstanding by the Use of at least one sealing or partition plate released, which is arranged behind the pressure plate during use and has a system or pattern of resilient elongated projections or "ribs", the reverse color distribution channels which are either in the back of the Plate with which the sealing plate is used together is to be, or located in a separate distribution plate arranged above the pressure plate. Every rib shows at least one through hole for the passage of e.g. printing ink and is inserted into one in the Manifold or pressure plate formed distribution channel introduced and creates a seal on the side walls.

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The ribs are less than the depth of the distribution channels in which they engage, and preferably the side walls of the ribs and channels meet before the remaining surface of the sealing plate reaches that of the pressure plate. this pressure is also applied to the sealing plate, as a result of which the ribs are pressed further into the channels. The seal is strengthened, printing ink is pressed into the channels and the opposing surfaces of the printing plate and the sealing plate are brought together. When the pressure is reduced, the elastic sealing plate expands again to its original dimensions, whereby a suction effect is exerted on the ink in the channels and thus reduces the risk of excess ink penetrating through the plate or to the gravure pattern after the printing process has ended was, vienn furthermore the gap between the dicing and the pressure plate is first closed during a printing process, the ribs of the sealing plate, which protrude into the distribution channel located in the pressure plate, are compressed, with the result that the compressed part is relatively firm Represents support for the pressure plate in the area of the distribution channel. As a result, the stress on the printing plate due to its uninterrupted use during repeated printing processes is reduced to a maximum.

The other surface of the sealing plate is preferably such designed that they provide a seal against a carrier

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creates plate for the printing form or printing plate. To this end, those extend through the sealing plate and those on it. Holes passing through the ribs each continue through a projecting peg or hump ¹¹ formed on the side opposite the ribs, which is used for sealing engagement in a hole passing through the carrier plate through which printing ink is pressed during use, or into the Nozzles of the injection devices is provided so that the pressure supply of the color is guaranteed.

A laminate consisting of layers of an elastic material and a middle one can serve as a sealing plate Layer of metal or another material with a stiffening effect consists »The one facing the pressure plate when in use However, the side of the sealing plate is preferably made of a smooth metal, since a cover layer is made of an elastic one Material, such as rubber, is subject to wear through friction and thus causes uneven pressure.

When the area to be printed is small and of different colors should be, the case may arise that there is not enough space available to the required number of printing ink distribution channels on the back of the! 'latte.

This difficulty can be solved with the help of at least one with one or several ink distribution channels equipped

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-5- 2213403

Distributor plate are overcome, which is inserted between the printing forme or printing plate and the carrier plate, wherein a sealing plate between two adjacent distributor plates (if more than one such plate is used) and between the distribution plates on the one hand and the carrier plate and the pressure plates on the other hand is arranged. The or each distribution plate is provided with holes, which correspond to the holes in the carrier plate, and with the help of a sealing plate sealed so that printing ink or a corresponding material to the distribution channels in the underlying Plates can be transferred. If the printing ink distribution channels are located both in the back of the printing plate as are also located in the distribution plate (s), the individual Channels cross other channels in another plate without the risk of mixing the colors, as there is the channels are at different levels. In this way, the distribution channels can also be much closer together are arranged, with only enough space for one or more, representing the connection to the pressure surface of the pressure plate Holes for the ink transport must be present without these holes penetrating into other channels.

In some cases it may be useful to have a specific color for each one used in printing To arrange the distribution channel system belonging to the liquid in a separate distribution plate. For example, if four colors are to be used when printing, the device can have three distribution plates and a pressure plate,

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each of these plates having distribution channels for receiving the liquid of a particular color and from the neighboring ones Plates is separated by a sealing plate.

It is also envisaged that the pressure plate does not itself with Distribution channels are provided and that the entire printing ink distribution is carried out in the distribution plate (s), The distribution channels located in it only have the color dispense directly into holes that go through the pressure plate

the
through and to / different parts of the gravure pattern

to lead.

The invention also extends to a printing apparatus, in which one or more er'P \, idungs proper sealing plates can be used but does not need to be used noxwendig _t. This is a device for the intaglio printing process of the type described wherein the material used for the pressure is forced through a pressure plate, which device comprises at least one distributor plate which is disposed adjacent to the printing plate during use and at least one liquid distribution channel each channel communicating through the printing plate with different parts of the recessed sexton which are to be printed in one color, and on the other hand receiving the corresponding color from the device. If more than one distribution plate is used and / or the pressure plate is to be equipped with channels in its rear side, the distribution plate (s) will be provided with holes,

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extending through the entire thickness of the plates to the printing ink to the distribution channels of the neighboring plates

convict. The invention also relates to a device of the type described, in which a sealing plate according to the invention, if necessary, is used without a distributor plate. The invention will now be exemplified with reference to the enclosed

Drawings are explained in more detail.

Fig. 1 shows in elevation an embodiment of the invention Printing device;

Figure 2 is a top plan view of one side of an embodiment a sealing plate according to the invention, which is shown in FIG device shown can be used;

Fig. 3 shows a section along the line 3 -3 ^of FIG. 2; Figure k is a plan view of the other side of a sealing plate similar to that shown in Figure 2; Fig. 5 shows a top view of the upper side of a gravure printing plate or plate ^gscieisü::; * Can the sealing plate shown in Fig. h be used?

Fig. 6 shows in elevation (partially in section) the sealing plate and the pressure plate according to its arrangement in the context of the device shown in Fig. ι; 7 shows the arrangement of the printing plate and its support plate when pressure is exerted during a printing process; Fig. 8 is a perspective view of that in the printing apparatus arranged injection devices; -and Fig. 9 shows a modified embodiment of a pressure device in which a distributor plate is used.

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In the drawings and in particular in FIG. 1, a printing device according to the invention is shown in which a press an upper part or piston 11 and a lower part or a die plate 12 on which the material 13 to be printed is placed will have. The piston 11 carries a generally designated unit 14, which has a plurality of printing ink injection devices 15 »a rotogravure form or plate 16 which is one of the the image to be printed has a corresponding recessed pattern, and a sealing plate 17 interposed between the pressure plate and the injectors 15.

In each case, the devices described in a proposal (cf. DOS 1 761 896) can expediently be used as injection devices 15 can be used to supply ink. The injection devices 15 are each connected via the lines 19 connected to a liquid storage container 18 which holds the printing ink or the corresponding one for printing the material 13 used medium supplies.

Each individual storage container 18 can contain a printing ink or a corresponding material with a different color tone and are in communication with a single injector; however, a single container can be connected to multiple injectors be connected. According to Fig. 1, two liquid storage containers are each with two separate liquid injection devices tied together. Each storage container is provided with a gas supply device 20 for a suitable one Gas, such as nitrogen, in connection with their help for overpressure above the liquid level in the reservoir l8

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is taken care of and the transferring or pressing of the liquid located in the storage containers l8 into the injection devices 15 promotes as explained below.

As best seen in Fig. 8, the unit 14 includes a plate 25 having a plurality of openings therein 26. The openings 26 serve to receive an upper guide part 27 of each injection device 15 · each injection device 15 "^ eist also below a nozzle 28, which in an opening 29 can be introduced which is located in a carrier plate 30 for a printing form or plate is located and with the Openings 27 in plate 25 is aligned. The carrier plate 30 and the plate 25 can have any desired arrangement of openings, which makes it possible, according to the respective work objective, the desired individual injection devices 15 can be installed between these plates. Furthermore, dummies of injection devices, i.e., injectors which do not have a liquid reservoir 18 are connected to be inserted into these openings.

The plate 25 is designed to be easily attached to the piston 11 the gravure press can be attached.

The carrier plate 30 is constructed so that the pressure plate l6 and the elastic sealing plate 17 can be easily attached thereto, and to provide a homogeneous structural unit can the plate 25 by suitable fastening means to the

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Support plate 30 are attached, or the parts can with With the help of suitable springs are held together, as shown schematically in Fig. 1 * It is thus a uniform Construction achieved so that when the plate 25 is separated from the piston 11 is, the liquid injection devices 15 »the pressure plate 16, the sealing plate 17 and the support plate 30 also be separated from the flask. It can also be seen that after opening the fasteners that hold the pressure plate 16 and fix the elastic sealing plate 17 to the carrier plate 30, another pressure plate with a different one ^ ruckmuster can be attached to the carrier plate 30 to generate a different print image; to be able to.

The sealing plate 17 consists of a laminate of a rubber layer 31 with a thickness of about 0.13 mm (0.005 in), which is connected to the upper side of a metal plate 35 used for stiffening. The rubber layer 51 has a plurality of outwardly projecting stool 32 which are respectively aligned with the nozzle of a corresponding injector 15 (see. Fig. 6) or in this nozzle extend "the line passing through the nozzle 28 outlet ports J> k here with the

36

through the stool 32 through holes / aligned. Only those stools 32, which are connected to injection devices, which are connected to a liquid storage container in Are connected, are equipped with the holes 36, which by the sealing plate 17 as well as by the protruding ribs formed on the other surface 33 of the sealing plate 38 lead through.

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As a comparison of FIG. K ' with FIG. 5 reveals, the ribs 38 are arranged in the form of a pattern which corresponds exactly to the pattern of the channels kO on the rear side of the printing plate or mold 16. Both the ribs 38 and the channels 40 have inclined side walls, and the ribs are formed somewhat thicker than the channels so that the side walls of the ribs create a seal against the sixth walls of the channels, with the lower surface 33 of the sealing plate 17 at a distance ( for example of about 0.25 mm; 0.01 in) above the corresponding surface of the pressure plate and the lower end of the ribs are also kept at a distance from the bottom of the channels (cf. FIG. 7).

If multi-color printing is to be carried out, everyone will the channels 4o on the back of the printing plate are used to convey those parts of the recessed pattern on the front of the gravure plate, which are printed in an exas-alr ^ "color through the holes through the pressure plate 42 to be supplied with the corresponding color.

Each channel is made of at least one with printing ink or a corresponding material of a single shade of color by itself an injection device connected to the back color reservoirs fed through hole 36 in the stool (s) associated with the injector (s), wherein the ink flows through the space between the lower end of the ribs and the bottom of the channels. To this Way, a multi-color print is achieved, with the one specific

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parts of the pattern exhibiting the th color separately from the part (s) exhibiting the other color (s) with the relevant Printing inks are fed.

During the printing process or the piston 11 and the plate is applied 25 pressure to the injectors through the press, and their hull ι transmits the Uruck to the support plate 30 and thus on the sealing plate 17, which in turn is pressed against the pressure plate l6. If now

30 the sealing plate between the carrier plate / and the pressure

16
plate / squeezed, the respective rubber layers are caused to form a tight seal on their opposing surfaces; the stools 32 fit into the corresponding recesses in the nozzles of the injection devices and the ribs 38 into the channels ^ O. The application of pressure to the injection devices also ensures that a piston located therein puts printing ink or a corresponding material fed into the injection devices under pressure and causes the printing ink to be pressed through the outlet openings 3 ^ to the holes 36 running through the sealing plate 17.

When the pressure is fully applied, the gap between the lower surface of the sealing plate 17 and the upper surface of the pressure plate 16 is closed and the ribs are pressed further into the channels up to the position shown in FIG. 7 by the dashed line kk.

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During the printing process that is then carried out, the sealing plate prevents any leakage of the printing ink between the channels 4o or between the carrier plate 30 and the pressure plate l6.

If the pressure applied during printing is canceled, does the sealing plate 1 expand? back to their original position and, as a result of the relative movement of the ribs, close The channels on the back of the printing plate will create a suction effect on those in the channels and in the intaglio pattern Ink exercised. This prevents excess ink from penetrating the printed surface. The suction effect thus contributes significantly to the fact that a. more impeccable and clean printing is achieved.

The use of the sealing plate also enables the printing ink to be subjected to pressure and suction as close to the printing plate as possible, which also helps to achieve better printing. This effect is improved by making the bottom of the channels kO in the pressure plate 16 as thin as possible, ie as compatible with the resistance of the channels to the pressure exerted during the process (cf. FIG. 6).

The sealing plate 17 with the ones on it. Ribs 38 is formed by placing them directly on the pressure plate l6

in a stereo form. After pressing the sealing plate onto the pressure plate, the former plate becomes separated from the latter, and the outer ends of the ribs

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. _lk . - 2219A03

around
are sanded / to create the gap at the bottom of the channel. The major part of the printing plate is also abraded about 0.025 to 0.05 cm (0.01 to 0.02 in). As a result, the gap between the ribs of the sealing plate and the pressure plate 16 is created when the sealing plate is brought into engagement with the inclined side walls of the channels at the ribs 38.

The embodiment shown in FIG. 9 differs from the embodiment described above in that a Distribution plate 50 between the pressure plate 16 and the carrier plate 30 is inserted and that two üichtuigsplatten available are. The upper sealing plate 17 'lies between the distributor plate and the carrier plate, and the lower sealing plate 52 between the distributor plate and the pressure plate l6 ·.

The upper, surface of the distribution plate has one or more distribution channels 5 ^ for the liquid used in the printing process, which correspond to the channels kO on the back of the printing plate in the context of the embodiment described above and are each connected to a hole 36 'through the sealing plate 17 'passes and is fed from an injection device 15 through the outlet opening 3 ^ in the nozzles 28 with printing ink or a corresponding medium of a certain color. The channels 5 ^ are closed by the ribs 38 'of the sealing plate / in the manner described above. Since the ducts have inclined side walls on all four sides or end faces

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Pump or
a suction effect is achieved as would be described above with reference to FIGS. 1 to 8.

The lower sealing plate 52, which is also made of rubber or a corresponding material, is on the lower Surface of the distribution plate 50 pressed or on this plate attached in a different way; however, this design is not decisive. The lower sealing plate 52 is also equipped with through holes 56, which with the holes 58 (the connection to the channels 54) are aligned and on the other hand run through protruding stools 60. the

62 in stool 60 engage in a sealing manner in conical depressions / the upper one or rear surface of the pressure plate 16 · which into the loading openings 42 'for the recessed pattern on the pressure plate 16' run out.

The printing ink supply for the Ve ^ Teil.-agskanäle 4o * in the The rear side of the pressure plate 16 'is shown on the right in FIG a plurality of conical recesses 64, in each of which one protruding from the lower surface of the sealing plate 17 '

66
Cusp / engages under seal. The feedthroughs or holes 36 'through the sealing plate also extend through the stool 66, so that when the device is used, the printing ink from the injection device into the recesses 64, then through the feedthroughs 68, which each run through the remaining thickness of the distributor plate is then pressed through a hole 70 in a rib 72.

The rib 72 rises from the undersurface of the lower sealing plate 52 and seals the upper part of a downwardly tapering distribution channel 40 'in the rear of the pressure plate 16' in the manner described above for the case of the ribs 38 and channels 40 is.

The stool 60 and the ribs 72 can be applied directly to the lower surface pressed onto the distributor plate or connected directly to this surface in some other way.

When the device is used in the printing process or when printing is used, the channels in the distributor plate are charged with printing ink, as shown on the left in FIG a good seal is achieved. The printing ink is transferred through the holes or "pits 58, 56, 62 and 42 'to the corresponding part of the recessed pattern on the front side of the pressure plate l6 ■ from the channels 54th ^u ie seal between the manifold plate and the back of the printing plate with the aid of the sealing plate 52 and engaging in the recess 6.2 hump - achieved 60th

At the same time, printing ink is passed through the holes or depressions 36, 64, 68 and 70 to the channels 40 'on the rear side the pressure plate transferred, with the rib 72 a good seal between the distribution plate and the pressure plate and the stools 32 and 66 also provide a good seal

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7: We see the nozzle 2 (> ti tr JSinspri'c ^ -vorrielitungea tuad der part plate herb eleven ülu'-eiio

'νciJixi the pressure is reduced in the process, dehiri; Both the sealing plate 17 "■" and the Blclitxasigsplette 52 as = ti er um, which exerts a suction effect ± u the -was · si ahead "with reference to the manner described in FIGS

It can be seen that the distribution channels 5 ^ - directly over the Distribution kai channels 4θ · be arranged and thus traverse them can; in Fig. 9 the various channels are only for shown side by side for better clarity. With the help of the arrangement in which the distribution channels over can run among each other, the multicolor printing can thus be carried out on a very small area while maintaining a sharp separation of the different color tones of the individual printing fluids.

For example, if four-color printing is to be carried out, three distributor plates 50 can be provided, from each of which is separated from the others by a suitable sealing plate 17 'or 52. The one shown on the right in FIG Arrangement is used to deliver printing ink through at least one distributor plate to the feed channels .in one below Transfer plate or in the back of the pressure plate, while the arrangement shown on the left in Fig. 9 serves to transfer printing ink from the channels in any distribution plate through at least one further distribution plate ' and pass through the total thickness of the printing plate. at

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. a>c; 1 '<hi Ακλ · ι aiiung 1st ei advantageous Cass ink a FCE ^ imiiiteK hue in the distribution channels of intended for this Faroe distributing erplatte or the Verteilungakanä ¹ s in the "pressure plate ückseite is distributed"

The entire distribution of printing inks can also be carried out exclusively in distribution plates, whereby the
Distribution channels in the back of the printing plate are dispensed with.

Finally, at least one distributor plate according to the invention can be used without the sealing plates 17 'or 52,
provided that an effective seal is obtained between the various panels; however, it is preferred to use the sealing plates as well.

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Claims (1)

(new) claims 1. Printing device, "in which the on a support plate attached printing plate is provided on its back with channels for the supply of the printing ink, which is engraved with are in communication on the front side of the pressure plate, characterized in that a sealing plate (17) or a distribution plate (5o) for the printing ink between the support plate (Jo) and the printing plate (16) on the side facing the pressure plate (16) with outwardly tapering into the channels (4o) of the Pressure plate (16) engaging ribs (38 or 72) provided is, and that in the ribs (38 and 72) holes (36 and 7o) are provided for the supply of the printing ink. 2. Printing device according to claim 1, characterized in that the sealing plate (17) or the distributor plate (5o) on the one facing the support plate (3o) Side with outwardly tapering pins (32 resp. 32 '), which in continuation of the holes (36 or 72) are also perforated. 3. Printing device according to claim 1- or 2, d a d u r ch g e k e η η ζ e i c h η e t that the sealing plate (17) from. a metal plate (35) which carries the ribs (38) on the side opposite the ribs (38) oil; xtische layer (31) with the pin (> 2). 209882/0567 marked, act -eic blasti see ochicht (. 1 ;, the ribs (; .8 "bsv;. 7? J and the Zfpi'en (> 2;;? us (junmii" beetehtrn. 5. Pressure device n; vch den A / 'issprohen 1 to ^z l-, α .dur c Ii ge ke η η ζ calibrate η et that the hips (;; 8 or 72) raise a lower height ils the depth of the channels (4o;
the pressure plate (ibj. received on 209BB2 / DS67 Blank page