FR2540433A1 - DEVICE - Google Patents

Abstract

A. DEVICE FOR ATTACHING A FLEXIBLE PRINTING PLATE. B. DEVICE CHARACTERIZED IN THAT, IN THIS SLOT 2, IS PROVIDED A BAR 8 NARROW THAN THIS SLOT OF AT LEAST DOUBLE THE THICKNESS OF THE PRINTING PLATE 3, AND WHICH INCLUDES HOLES 9 THROUGH WHICH PASS , WITH CLEARANCE, THE POSITIONING PINS 6. C. THE INVENTION RELATES TO A DEVICE FOR FIXING A FLEXIBLE PRINTING PLATE TO THE PLATE CYLINDER OF A ROTARY PRINTING MACHINE, IN PARTICULAR AT HIGH SPEED.

Description

i.- Device for fixing a flexible printing plate "

  The invention relates to a device for

  put a flexible printing plate on the cylinder of the plates of a rotary printing machine,

  There is known a device for setting

  Flexible Printing Systems (DE-PS 1 960 635), which

  carries at least one slit, whose width corresponds approximately to the thickness of two printing plates # of which

  the opening is inclined in the direction of rotation of the cy-

  liner plates, and which is traversed by positioning pins, fixed in the cylinder body of the plates, for the printing plates, device in

  which the two edges of the printing plate,

  plucking on the periphery of the cylinder plates, edges previously folded according to the inclination of the

  slot and provided with slots for the positioning pins

  are maintained without additional technical means.

  The disadvantage in the case of this device is that to avoid during the printing process that

  both edges of the printing plate slide

  out of the slot, it must be very narrow

  requirement entails a significant expense for the achievement

  In addition, fouling occurs.

  later in the printing process, can only be removed in a relatively difficult way from this slot. In addition, the fact that the edges of the 2.-

  printing plate are relatively free in the

  it imposes certain limits on an increase in

print speed.

  The object of the invention is to simp 2 Wier the manufacture of the device, to reduce the expense for its

  maintenance and increase its operational safety.

  The object of the invention is to create a device for fixing a flexible printing plate on the cylinder of the plates of a rotary printing machine.

  cylinder having at least one axially extending slot

  in the cylinder of the plates, with its opening

  bent in the direction of rotation of the platen cylinder, and traversed by the positioning pins, fixed in the plate cylinder, for the printing plate

  provided at its anterior extremity and its extremity

  a folded and split edge to fit the positioning pins, so that the slot

  be carried out mechanically rationally and then

  later, to be cleaned without problems and to

  way that in particular the front edge of the plate

  pressure can be maintained within this window.

  to the extent necessary for the process

  for printing machines, and that for

  fast-track, there is also a possibility of

  additional fastenings of the posterior edge of

the printing plate.

  This goal is achieved in accordance with the

  in that in the slot is arranged a bar, narrower with respect to this slot of at least twice the thickness of the printing plate, and comprising

  holes allowing the passage with the game of bro-

positioning.

  Thanks to the arrangement in the slot of a bar simple to manufacture, this slot can be, in

  the thickness of the bar, which is expected to be

  3.- ger such that it can be performed in the cylinder plates by a simple milling process As with the increasing speeds of rotation of the cylinder plates, including the fixing of the front edge of the printing plate on the cylinder plates is put

  in danger, this is a positive action of a

  sultante centrifugal forces acting on the bar, resulting that, because of the special inclination of the

  slit, is directed towards this anterior edge.

  The introduction into the slot of the embroideries

  folded of the printing plate, is facilitated when

  that, according to the invention, the bar comprises at the periphery of the cylinder plates, on one of its two longitudinal sides or on both, a chamfer or

rounded.

  To avoid excessive solicitation

  during the printing process of the positioning pins

  intended for the printing plate - and which

  the bar, it is advantageous that this bar is, in accordance with the invention, set back from

  at the periphery of the cylinder of the plates.

  The cleaning of the slot is noticeably

  When the bar can be removed from the slot, the same procedure is possible when the printing plates are exchanged, in that the bar

  previously removed from the slot, is embedded in this

  splits respectively after hooking the two edges of the printing plate For this purpose, the holes in the bar for the positioning pins, are,

  according to the invention, widened in the direction

  of the bar, to each constitute a

  which, apart from the position of the spindle pins,

  sitionement when the bar is mounted, is transformed into a notch directed towards the inside of the slot of the cylinder, the width of this buttonhole and this notch 4.-

  being at least equal to the diameter of the bores.

  In this case, to prevent the barrette

  you do not fall from the slit of the cylinder of the plates, a bu-

  attached laterally removably against the cylinder

  plates are placed against the front panel of

the bar.

  To relieve the positioning pins and to help hold the bar in place, a holding member may, according to the invention, be removably laterally fixed against the platen cylinder and engage over a shoulder of the bar. or come into engagement in a piercing or

  a recess on the front side of the bar.

  If the bar is often removed from the slot, for example during each replacement

  of printing plates, it is advantageous that, in accordance

  to the invention, the bores provided in the bar

  for the positioning pins, each is trans-

  formed into a notch of at least equal width and

  to the inside of the slot, so that

  troduction of the bar in the slot or its extraction of this slot, can be done directly in the direction

  perpendicular In this case, the bar must be

  at both ends in the slot of the

  already described with the aid of a

  This variant is particularly suitable for setting up to a large extent without play of the bar in the slot already previously lined with both edges of the printing plate, which

  has an action favorable to a positioning on the pla-

  than printing on the cylinder plates in the case

  a high print speed.

  The introduction of the bar in the slot after the establishment of the edges of the printing plate, is facilitated, as well as the clamping effect, - exerted on the edges of the printing plate is located reinforced, where, in accordance with the invention, the section

  cross-section of the bar is narrowing

  corner in the direction of its c 8 tee turned towards the bottom of the cylinder slot In the case of a speed

  very high printing capacity, and the fact that the

  the printing plate increases, it is also advantageous for the printing process that the back edge of the printing plate

  without play in the slot of the cylinder, what for the bar-

  Corner-shaped rette is particularly suitable.

  At least the introduction into the slot

  of the cylinder of a bar of cross-section of pre-

  rectangular, can be facilitated when,

  according to the invention, the bar, in the bottom of the slot, has on one of its longitudinal sides or on both, a chamfer or a rounded In this

  cases, chamfers or roundings are not necessary.

  on the bar at the periphery of the cylinder of the

c.

  For high print speeds,

  It is advantageous to be able to apply voluntarily

  the bar against the edge of the

  than printing placed forward in the direction of rotation of the cylinder of the plates In the case of this variant,

  the additional advantage is that after the introduction

  in the slot on the edge of the pressure plate,

  forward in the direction of rotation, the bar thus

  pressed against this household edge on his other side of good-

  conditions for the introduction of the rear edge of the

printing plate.

  This can advantageously be technically achieved in that, according to the invention, the bar

  laterally beyond the cylinder capacity of the plates, take

  then, by its face placed forward in the direction of rotation 6.- of the cylinder of the plates, against a screw guided in a

  support fixed on the front ends of the cylinder of the

  In this case, and in combination with a singing of the bar, the latter can be prevented

  simple way of falling out of the slot, when, in accordance

  In the invention, the screw penetrates with play into a hole in the bar by a portion of the reduced diameter relative to the diameter of this screw outside the bar.

bar.

  The invention will be explained in more detail

  hereinafter with reference to an exemplary embodiment

  shown in the accompanying drawings in which: Figure 1 is a cross-section of the cylinder of the plates with a device for fixing

  of the printing plate in the form of a bar

  placed in a slot in the cylinder and liable to

  place on the positioning pins 9

  Figure 2 shows a variant of reali-

  sation of the bar to extract this bar from the slot,

  Figure 3 shows a stop for the blower

  FIG. 4 shows an additional holding member for the bar provided with a front-end shoulder, FIG. 5 is a section along the line AA of FIG. 4, and in addition, FIG. representation in dot-dots of another embodiment of the bar, FIG. 6 shows an additional holding member for the bar provided with a recess on the front side,

  FIG. 7 represents a bar capable of

  tible to be extracted from the slot and having a section 7.-

cross-shaped wedge.

  Figure 8 shows a pressed bar

  against the front edge of the printing plate.

  According to FIG. 1, in the cylinder 1 of the plates, an axially extending slit 2 is disposed whose opening is inclined in the direction of rotation, indicated by an arrow, of the cylinder 1 of the slabs. number and arrangement of the printing plates 3 over the width of the cylinder 1 of

  plates, can extend either on the whole or only

  part of the width of the cylinder 1 of the plates.

  The slot 2 is traversed perpendicular-

  at its lateral faces 4, 5 by position pins

  6 which are introduced to the press in a

  corresponding hole 7 of the plate cylinder 1 and

the latter on its periphery.

  In the slot 2 is disposed a bar 8, narrower than the slot of at least twice the thickness of the printing plate 3, and which comprises for each of the positioning pins 6, a bore 9 with clearance, so that the bar 8 does not rest on the bottom of the slot 2 can move in the slot, depending on the congestion conditions that arise, in the axial direction of the positioning pins 6 e The two edges, previously bent in a special device, the printing plate 3, are respectively introduced into the intermediate spaces, 11 delimited respectively by the bar 8 and the

  side surfaces 4 or 5 of the slot, these edges

  in the vicinity of the positioning pins 6 adjusting the printing plate 3 on the cylinder 1 of the plates, respectively a perpendicular notch 12, 13

  edge 14, placed forward in the direction of rotation of the cy-

  linder 1 of the plates, and particularly stressed during 8.- the printing process, of the printing plate 3, is maintained, because of the inclination of the slot 29

  at an acute angle to the periphery of the cylinder

  plates, while the rear edge is less

  quoted 15 is held at an obtuse angle with respect to

  the periphery of the cylinder 1 of the plates.

  If, in the circumferential direction of the cylinder,

  1 plates, two printing plates 3 must be fixed on it, then two devices according to the invention offset from each other by 180, must be arranged on the periphery of the cylinder In this case , the rear edge 15 of the printing plate 3

  in Figure 1, would belong to the second plate of

  pressure. To facilitate the introduction of the edges 14

  15 of the printing plate 3, the bar 8 is

  between the two sides, at the periphery of the cylinder 1 of the

  respectively, of a 16, 17.

  When setting up the plate of

  pressure 3 on the cylinder 1 of the plates, the front edge 14 of the printing plate is first introduced into the intermediate space 10 The bar then applies

  on the opposite lateral surface 5 of the slot 2

  of the printing plate 3 in the axial direction of the cylinder 1 of the plates, is effected by means of the pins of

  positioned in slot 12 of the pla-

than printing 3.

  Under the effect of the rolling of the cylinder 1 of the plates, the flexible printing plate 3 is guided all around the periphery of the cylinder 1 of the plates, and its rear edge 15, after a displacement of the bar 8 on the positioning pins 6 against the front edge 14,

  is introduced into the intermediate space 11.

  To avoid a too high stress of the positioning pins 6, the bar 8 is some 9._ slightly behind the periphery of the cylinder

plates.

  When the rotation speed of the cylinder

  1 of the plates croitt the component of the centrifugal force

  directed on the front edge 14 of the printing plate

  3, increases, whereby the fixing of the plate of

  pressure 3 on the cylinder 1 of the plates, is favored

  laughingstock. FIG. 2 shows, in the mounted position, the variant of an interchangeable bar 8. In this case, the bores 9 provided in the bar 8 for the pins

  6, are widened in the longitudinal direction

  tudinal of the bar to form a buttonhole 18 which, outside the position of the positioning pins

  6 when the bar is mounted, turns into a

  size 19 directed inwardly of the slot 2-of the cylinder

  dre. With this arrangement, the bar 8 can be removed without difficulty from the slot 2 to allow

  cleaning the latter Similarly, when charging-

  printing plates 3, it is possible to

  first of all their two edges 14, 15 in the slot 2 and, only then, to push the bar 8 into the slot 2 and, thanks to a suitable longitudinal displacement,

  stop it on the positioning pins 6.

  To prevent a fall in

  bar 8 out of the slot during the printing process.

  this bar is blocked during long travel.

  dinal by appropriate technical means.

  FIG. 3 shows in this respect, a stop 24 applying against the front face of the bar 8 and

  attached laterally to the cylinder 1 of the plates by the

  intermediate buttonholes 22, 23 by means of two screws 20,

  This abutment may also, after an amendment

  property of its construction, to be fixed on the cylinder 1 10.- plates so as to be able to pivot or, fall back in

  leaving the possibility of stopping in the

as for the bar 8.

  Figure 4 shows for the additional blocking

  of the bar 8 a holding member 29 attached laterally to the cylinder 1 of the plates by means of buttonholes 27, 28 and by means of screws 25, 26,

  in which a shoulder 31 provided on the front side of the bar-

  rette 8 comes into engagement so that the bar can not

  to move in the axial direction of the position pins

  6 As can be seen in FIG. 5, which is the sectional representation corresponding to FIG. 4, the stop member 29 also fulfills the function of the stop 24 according to FIG.

  of the bar 8 in longitudinal displacement.

  The holding member 9 may also be able to pivot or fold to facilitate

the exchange of the bar 8.

  In FIG. 6, unlike FIG.

  4, the retaining member 34 also fixed by two via 32, 33 on the cylinder 1 of the plates engages with a pin 35 similar to the positioning pins 6, in a bore 36 of the bar protruding laterally from the cylinder 1 plates During frequent changes

  of the bar 8, the bore 36 should be advantageously covered

  In the form of a notch open at the front end, or the retaining member 34 should be provided with a pin 35 mounted only one side, or with reference to Figure 4, with a decrease likely of

  move in the axial direction of the bore 36.

  Figure 5 shows in dot-dashes

  9 provided in the bar 8 for the posi-

  6 and which have been extended to form a notch 37 having at least the same width and directed towards the inside of the slot -2 of the cylinder. In this case, the bar 8 must be locked at both ends by a locking member. holding 29 preventing it from falling out of the slot 2 This alternative solution has the advantage

  that, for example, the bar 8 can be removed relatively

  easily from slot 2 for each change of printing plates 3, and can also be inserted into

  -a large measure without play in slot 2 already before-

  equipped with both edges 14, 15 of the printing plate

  3 For this purpose, the bar 8 should advantageously

  on either side of its slot, facing towards the bottom of the slot 2, a chamfer 38, 39 (FIG. 4),

  The last-mentioned variant last mentioned

  benefits for a safe implementation of the

  printing plate 3 in the case of a printing speed

high level.

  FIG. 7 shows a bar 8 whose cross section narrows in the form of a wedge-in 'the

  direction of its c 8 tee turned towards the bottom of the slot 2.

  The complete depression of the bar 8 in the slot 2 causes an application without play of the two edges 14 15

  of the printing plate against the side walls

  4, 5 of the slot 29 so that the folded edges are not released from the slot 2, even for a speed

high print.

  FIG. 8 shows a possibility for an additional blocking of the front edge 14 of the printing plate 2, particularly stressed edge for high printing speeds A support 42 fixed by two

  40, 41 on the front face of the cylinder 1 of the

  It has a threaded hole in which is guided a screw 43 which is applied to the c 8 tee placed forward in

  the direction of rotation of the cylinder 1 of the plates, of the

  bar 8 protruding laterally For the introduc-

  tion of section 8, placed forward in the direction of rota-

  the cylinder 1 of the plates, the printing plate 3, 12.-

  the screw 43 is brought back into the support 42 thus guaranteeing

  if the possibility of movement without hindrance of the bar 8 in the slot 2 After the completion of this process, the bar 8 is pressed by actuating the screw 43, against the front edge 14 of the printing plate 3, which simultaneously increases the intermediate space 11

  for the introduction of the trailing edge 15 of the plate of

pressure 3.

  In the case of an interchangeable strip 8,

  Moreover, the screw 43 additionally fills the latter with a holding function, in that it penetrates with play into a hole 45 of the strip with a portion 44 of smaller diameter than the diameter of the screw outside the hole. the bar 8, and thus it prohibits any possibility

  of movement of the bar 8 outside the

  in the longitudinal direction of the position pins

6.

13 o

REVE N DICAT IONS

  1 Device for fixing a suede plate

* flexible pressure on the cylinder of the plates of a

  rotary printing device comprising at least one slot S extending axially in the cylinder of the plates 9 with its opening inclined in the direction of rotation of the cylinder of the plates, and traversed by pins of

  fixed in the cylinder for the suede plate

  mixed pressure respectively at its anterior end

  and at its posterior extremity of curved and

  cut to fit the positioning pins, characterized in that in this slot (2)

  a bar (8) is arranged narrower than this

  at least double the 19 thickness of the plate d 9 ime

  pressure (3) 9 and which has holes (9) in the-

  which pass, with play, the positioning pins (6) 2 o = device according to revenidication 19

  characterized in that the bar (8) carries to the periphery

  of the cylinder (1) of the plates 9 on one of its c8 tees Ion-

  or on both 9 a chamfer (169 17) or a rounded O 3 Device according to claim 1 characterized in that the bar (8) is recessed relative to the periphery of the cylinder (1) plates 4. Device according to claim 1 characterized in that the holes (9) in the bar (8) for the positioning pins (6) are widened in the longitudinal direction of this bar

  to each form a buttonhole (18) which 9 in

  out of the position of the positioning pin (6) when the bar (8) is mounted, turns into a notch (19) directed inwardly of the slot (2), the width of this buttonhole (18) and of this notch

  (19) being at least equal to the diameter of the bores (9).

  14.- Device according to any one of claims 4 'and 4 e, characterized in that against the front face of the bar (8) is disposed a stop (24) laterally fixed detachably z-ir the cylinder ( 1) plates, 6.- Device according to claim 1,9 characterized in that, laterally on the cylinder (1) of the plates 9 is fixed a member of (anin 29) coming ei taken over aii shoulder (3) of the ber-reverte (8) 7, - = DI zpositif according to-reedcto 9 characterized in that q 2 ue laterally mir_D 14 oyîindre (1) plates, is fix éé a 1 oraede holding (, 54) engaging in a perforation, age (36) or in a unit of the bar (8), S device according to 119 a list of O

  claims I and G or 7, where it is possible for them to

  (9) arranged in the bar-rette - (8) potur, the positi wiement br-oches (6, are widened for onsit each one e: italle (57) d Qépa 2 essei 2 r at least equal dir to the inside of the, female (2), 9. Device according to any one of

  Claims I and 4 or 8, characterized in that

  transverse section of the bar (8) narrows in the shape of an eye in the direction of its side.

bottom of the slot (2).

  , Device according to any one of the

  reevendcainsi t 4 u e N that the bar-

  rette (8) p at the bottom of the slot (2) g carries on one of its two longitudinal sides or on both sides a chamfer (38 th

39) or a rounding.

  Device according to Claim 1.

  characterized in that the bar (8) is applied

  adhesively against the side (14) in the direction of rotation of the platen (1) of the printing plate (3), 15.- 12. Device according to any one of the

  Claims 1 and 119 characterized in that the bar

  (8) protruding laterally from the cylinder (1) of the plates, is supported by its side placed forward in the direction of rotation of the cylinder (1) of the plates, against a screw (43) guided in the support (42) fixed on the front side of the

cylinder (1) plates.

  13. Device according to any one of

  Claims 1, 4 or 8, 11 and 12, characterized in that

  the screw (43) penetrates with clearance, at one end (44), of reduced diameter relative to the diameter of the screw outside the bar (8), in a bore (45) of

the bar (8).