Tampon printing machine.

p0001The invention relates to a pad printing machine having a blade carriage which is connected at its end with a doctor blade unit with doctor blade knife, which is a directed parallel to the adjustment direction of the blade carriage axis of rotation transversely thereto pendulum is suspended and held by means of one or more spring elements in Nivellierstellung cliché.

p0002In known pad printing machines, the blade unit by means of a bearing pin which terminates in a threaded portion screwed directly onto the blade carriage. The balance springs in the leveling of the doctor blade is fixed to the blade carriage and supported on the blade unit. This fastening of the squeegee unit replacement thereof involves considerable dismantling and assembly costs. In addition, the blade unit on the single bearing bolt is supported ambiguous, particularly occur tolerance movements when the blade unit is moved with pressure on the cliché. This tolerance movements cause uneven contact pressure of the doctor blade, which results in an uneven Einfärbvorgang on cliché.

p0003The object of the invention to improve a tampon printing machine of the type mentioned so that the blade unit can be replaced quickly and easily, yet a unique guide and leveling when inking the printing block is guaranteed.

p0004This object is achieved according to the invention in that the squeegee unit is pushed onto at least two carrier pins of a bearing block and is held thereon by means of a closure in the manner of a bayonet catch or the like., That the bearing block by means of a bearing pin mounted in a parallel to the adjustment direction of the blade carriage directed bearing bore is mounted the knife carriage and held against axial displacement therein, and in that on the squeegee carriage a spring element or two spring elements are mounted, which are supported on the bearing block and to exert on this opposite torques.

p0005The blade unit is now performed by means of two carrier bolts clearly on the bearing block, which can be compensated to the surface of the cliché adjust by the spring element or the two spring elements so that the entire length of the doctor blade the same contact pressure is achieved. The bearing block can be stored with a stronger dimensioned bearing pin pivotally on squeegee carriage so that the pivot bearing takes no more tolerances, which also has an advantageous effect on the leveling of the squeegee unit. The blade unit can be replaced with the bayonet or the like. Very quickly and easily.

p0006The configuration may be such that the carrier pins are integrally formed on the bearing block and are arranged on a transverse carriage to the adjusting direction of the squeegee horizontal plane once.

p0007A further embodiment is characterized in that the carrier pins are provided on the doctor blade carriage facing the end provided with a collar, and that the carrier pin of the blade carriage side facing are used in accordance with settled through holes of the bearing block.

p0008The connection between the blade carriage and the bearing block is performed according to one embodiment simply in that in the blade slide a transverse to the bearing bore receptacle for a spring element is introduced, which holds the provided with a circumferential locking groove, imported bearing pin of the bearing block with detent.

p0009The formation of the connection between the bearing block and the blade unit is achieved in that rotate as a closure between the carrier bolt a locking bolt, but is axially fixed in the bearing block, that the locking pin carrying a locking collar at the free end projecting out of the bearing block, the one having rectangular cross section in that the doctor unit includes a locking catch which corresponds to the cross section of the locking Federal, and in that the locking collar can be inserted in the lock receiving the doctor blade unit and by rotating by 90 ° behind this is rotatable in a rotational position of the locking bolt to the doctor blade unit in the bearing block define. The axial fixing of the locking bolt in the bearing block is constructed according to one embodiment, that the locking pin is provided with a circumferential annular groove, into which an adjustable in the bearing block retaining screw or a spring-loaded detent ball and the locking pin holds axially fixed in a receiving bore of the bearing block.

p0010A defined angular position of the bearing block and doctor unit in the preparation of the compound is ensured that the locking pin comprises two on its periphery displaced by 90 ° snap-in receptacles for a spring-loaded detent ball and in that the latching positions determine the Einführund the locking position of the locking bolt in the doctor blade unit. In this case, a kind of tension can be achieved in that the locking pin is kept on a compression or tension spring and a bearing ball bounded axially adjustable on the bearing block.

p0011The torques required for leveling will be thereby transmitted to the bearing block, that is embodied as a leaf spring spring element is arranged below the locking block on the bearing block and extends to the width in equal parts to both sides of the locking bolt, or that two designed as leaf springs same spring elements are mounted at the same distance from the locking pin on the underside of the bearing block.

p0012The bayonet joint is further so designed that the locking retainer has a depth corresponding to the distance of the locking collar of the locking pin from the bearing block, and in that following the locking retainer passes the doctor blade unit in a bore having a diameter which is equal to or greater than the longitudinal dimension of the rectangular locking collar of the locking bolt.

p0013The required rotation of the locking bolt can thereby be run more easily, that the locking pin in the front of the lock Federal a tool holder, such as Phillips, hex retainer having, as an appropriate tool can be applied.

p0014The invention is illustrated with reference to an embodiment shown in the drawing. It shows:<ul><li>FIG. 1 shows the end of a blade carriage with a pendulous bearing block connecting a blade unit in plan view,</li><li>Fig. 2 shows the part of the blade carriage according to Fig. 1 in side view and</li><li>Fig. 3 a can be connected to the bearing block at the end of the squeegee blade carriage unit.</li></ul>

p0015The two views according to FIGS. 1 and 2 show only the end of the doctor slide 10, of a adjusting movement in the machine frame carries in known manner to the doctor blade unit to move 30 of FIG. 3 on the ink trough and the printing block. These processes are known and are therefore not described in detail since they are also for the present invention also is not important. The doctor unit 30 is no longer directly a pendulum suspended from the blade slide 10, but via the bearing block 14th

p0016The blade unit 30 has a support 31 for the doctor blade 32, which lags the inking roller 33rd The carrier 31 is slid over two bearing bores on the carrier pins 16 and 18 of the bearing block 14, thereby a clear bearing on the bearing block 14 is reached. The support pin may be integrally formed 16 and 18 on the bearing block 14th The carrier pins 16 and 18 may be provided as separate parts also with an end collar 17 and be used by the doctor slide 10 facing side in accordance with stepped bores of the bearing block 14th The bearing block 14 itself carries the molded or inserted bearing pin 15 which is held axially fixed in the bearing bore 11 of the blade carriage 10, but is free to rotate.

p0017For this purpose, in the transversely to the bearing bore 11 facing receptacle 12, the spring element 13 is used which engages in a circumferential locking groove of the bearing pin 15 and holds it against axial displacement.

p0018On the underside of the blade carriage 10 designed as a leaf spring spring element 29 is attached as the fastener 19 shows. This spring element 29 is supported in the center of the bearing block 14 on its bottom side down so that it is opposite to the bearing block 14 about the given through the central axis of the bearing pin 15 axis of rotation, preferably exert equal torques. The leaf spring extends with its width on both sides of the center of the bearing block 14 with equal proportions, so that a clear adjustment to the surface of the plate is achieved when coloring thereof. The same effect is also achieved when two identical leaf springs are arranged at the same distance from the central axis of the bearing pin 15 and are supported on the bearing block fourteenth

p0019Between the carrier pin 16 and 18 of the locking bolt 20 is supported in the bearing block fourteenth Contents he is by the locking screw 23 that is inserted into the annular groove 22 of the locking bolt 20 and this axial displacement, but freely rotatable holding in a bore of the bearing block 14th This axial location may also include a resilient latch element, eg a spring-loaded detent ball assume, which engages in the annular groove 22nd The locking bolt 20 projects out of the bearing block 14, carrying at the free end of the rectangular locking collar 21. The initial position of the locking bolt 20 is secured by the spring-loaded detent ball 24 which engages in a snap-in receiver, which is peripherally inserted into the locking bolt 20th In this initial position, the blade unit 30 is slid, the locking collar 21 is inserted through the same cross-section locking catch 34 in the carrier 31st The locking retainer 34 then passes into the bore 35 having a diameter which is equal to or greater than the longitudinal dimension of the rectangular locking Federal 21. The depth of the locking retainer 34 corresponds to the distance that the locking collar 21 takes from the storage block fourteenth After insertion of the locking collar is rotated by 90 °, as reference numeral 21 'in Fig. 3. Fig. The detent ball 24 snaps into a further offset by 90 ° catch recess of the locking bolt 20, so that the locking position is fixed. Here, the locking collar engages behind the locking catch 21 34. The locking bolt 20 can be spring-loaded by a compression or tension spring 25 and can be supported with the bearing ball 26 in the bearing bore of the bearing block 14th Thus, a strain of the doctor unit 30 on the bearing block 14 can be achieved.

p0020The pivot bearing assumes in this configuration of the bearing pin 15 of the bearing block 14 in the bearing bore 11 of the doctor slide 10, it can therefore be interpreted much more precise and stable, which affects a much better balance and a unique adaptation of the doctor blade 32 to the surface of the cliché ,