FR2513179A1 - PRINTING PRESS WITH PLATINUM - Google Patents

Abstract

THE INVENTION RELATES TO A PLATINUM PRINTING MACHINE. THE MACHINE INCLUDES A TURRET WHICH INCLUDES A BLOCK 56 WHICH CAN ROTATE AROUND A SLEEVE 52. RADIAL PASSAGES 55 TRANSMIT A SLEEVE DEPRESSION TO HOLES 60 SHAPED IN THE OUTER PLATE OF THE SLEEVES SO THAT THE PRINTED SHEETS ARE RETAINED ON THE EXTERNAL FACES. APPLICATION TO PRINTING BUSINESS CARDS.

Description

The present invention relates to a method of im-

  As well as printing presses, it relates in particular to methods and printing presses of pre-cut blanks such as small tickets or cards, for example business cards. None of the current small print processes

  cards does not give full satisfaction.

  In a first card printing process

  number of cards are printed simul-

  at the same time on a single large sheet, by offset printing.

  The entire map can then be processed

  thermographic procedure during which powder is

  The surplus is removed by hand or in a semmechanical way. Heating After that heat treatment during which the powder melts, the impression on the card takes on a relief effect. Then, each sheet must be sheared separately or stacked with a single or

  two other sheets only so that the cutting of the car-

  This is a relatively slow operation. The cleanliness and precision of the cut depends on the shear or cutter used. In addition, the alignment of the sheet, when printing all the cards following a grid. determined, has a certain inaccuracy and the alignment in the shear or paper cutter is a second source of errors, so that the printing

  may not be aligned and / or variations may appear

  look at the dimensions of the cards.

  In fact, it is desirable to print cards

  cards or other small cards in a pre-form

  cut blanks can be purchased in

  packages with very different dimensions; in each

  The size of the cards is very precise and the edges of the cards are cut sharply. This means that printed cards can be stacked in a clean way.

  so that they give a good presentation to the buyer.

  However, it has been found until now that it is very expensive to print small individual cards, especially when the printing has to be close to the edges, given the difficulties of handling the cards.

  a printing process using cards pre-

  cut, they are put, by hand on a machine

  in which they are maintained by

  edge clamping devices or the like which reduce the

  face available for printing After the printing itself

  even, the cards are removed by hand.

  Placing and removing cards on a turntable using the edge clamping devices

  are very inconvenient, both for typo printing

  graphic and in other systems.

  The invention relates to an improved stage for

  printing press that does not have these disadvantages.

  More specifically, the invention relates to a platen printing press comprising a plate which has internal passages providing communication between an external connecting member and the front face of the plate, and suction devices connected to the organ. external

  connection so that a printed sheet material is

  sea can be retained on the plate by suction when

of printing.

  The front face of the plate is preferably

  covered with a plate having a plurality of bores communicating with the internal passages, the plate may be covered with a

  sheet of a porous material which is preferably also

so elastic.

  The press advantageously includes several

  tines placed around a rotating turret which has a central sleeve arranged axially, the plates having bores

  arranged radially and which communicate with the central sleeve

  tral, at least for a part of the time.

i.

  Other features and advantages of the

  will be better understood by reading the description

  which will follow examples of embodiment and with reference to the accompanying drawings in which: Figure 1 is a schematic plan view of a

  turret arrangement having a plurality of turntables, according to the

vention;

  Figure 2 is a perspective of a

  printing plete made according to the invention; Figure 3 is a sectional plan of the platen of the press, in the form of a turret; Figure 4 is a vertical elevation of a face of the plate; and FIGS. 5, 6 and 7 show three variants of printing press according to the invention, in tick diagram form. FIG. 1 represents schematically and in plan,

  a multi-turn turret for a printing press

  The turret 10 is mounted so that it can

  11 and it has four plates 12 which receive a sheet material during printing for example of individual cards 13 The machine is intended to ensure a two-color printing of each card and

  it has two printing stations 14, 15 Print Heads

  sion move in translation relative to the decks

  as indicated by the arrow 16 On the third side of the

  connects 10, a device 17 for supplying and transporting

  puts the cards 13 one by one at the turntable After the impres-

  the cards are released from the fourth side of the

  and trained as indicated by reference 18 Any provision

  Tif suitable can be used to maintain the map on the turntables and, in the particular case considered, the plates are in the form of suction pads, a depression being maintained from inside the turret as lee

  cards are kept on the decks.

  Figure 2 shows a complete press of

  The press has a base frame 20 mounted on wheels 21 It has two main parts, the first being the part 22

  printing and the second a part 23 of heat treatment

  Part 22 has a multi-plane turret 24

  tines, the principle of which has already been described with reference to

  FIG. 1, the details being described below in reference

  FIGS. 3 and 4 The press has a main switch housing 26, a control panel 26 and compressors and vacuum pumps 27 A magazine 30 is adapted to contain pre-cut blanks which are to be printed. intended to extract the blanks one by one from the magazine 30 and to transmit them one by one to the first plate of the turret 24 The second and third plates of the turret 24 are placed near the first and the second printhead 32, 33 Each

  printhead has a separate reservoir 34 of ink, the re-

  tanks containing inks whose colors are different

  The fourth stage of the turret is located at the evacuation station and a card that has been printed is released there so that it passes into the part 23 of treatment

thermographic press.

  The thermographic treatment part comprises

  a dusting device, a conveyor 36, a dispenser

  heater 37 and a cooling fan 38

  Completed cards are evacuated in a tray 39.

  When released by the fourth platen, the cards slide along an inclined plate 40 and are then moved on the wafer by a conveyor belt 41, in the direction of the arrow A hopper 42 contains a powder of relief printing that is transported to the

  high by a conveyor belt 43 The printing powder

  relief is poured from the top of the trans-

  carrier 43 on the map that goes underneath so much that the

  powder necessary for thermographic treatment adheres to the

  cre still wet A small vibrator causes expulsion

  excess powder by shaking The rest of the heat treatment

  is entirely classical and is not described more

in detail.

  During operation, the turret 24 rotates accurately 900 at each step At each stop, the four plates are accurately positioned at the four positions their surface being vertical The support 44 of the tourell

  24 is relatively massive so that the turret can

  carry the forces applied by the printheads 32, 33 when they operate These heads and their ink tank and the forms and the necessary inking mechanisms are of conventional type and are not described

in detail.

  The operation of the press is as follows.

  From the initial rest position, a

  first card is removed from store 30 and is

  The turret 24 is rotated 90 'so that the card is at the first position of the transfer station, which preferably operates with suction pads, on the stage which is at that moment in front of it. During the next stop, a second card

  is applied to the next stage and a first

  pressure is executed on the first card by the head 32.

  Turret 24 turns 90 'again, and a third

  card is applied to the deck while the second car-

  is printed for the first time by the first press 32 and the first card is printed for the second time by the second head 32 After a third rotational movement, the first card reaches the evacuation station and it can fall on the carrier At this moment, the four plates of the turret 24 are in operation, and a fourth rotational movement places the first plate which is then empty again in the initial position, allowing

  setting up a new map.

  As described hereinafter, the turret 24 uses a suction circuit for

  the retention of the cards on the decks, allowing a func-

  extremely fast and convenient.

  placement of the turret 24 under the action of the head of

  pressure is minimal thanks to the support 44, a low level of

  As a result, the operations of the heads 32, 33 are not rendered synchronous so that the displacement of the plate caused by one of the heads

  does not cause smearing of a simul-

  At the same time, there is a certain delay between the two operations so that the turret 24 can return to its fixed central position before the second printing is executed.

  We now consider the construction of the

  24 with reference to FIGS. 3 and 4 The section of FIG.

  Figure 3 indicates that the turret has essentially one

  The block 56 has a central vertical bore 50 provided with a coating 51. It is mounted in such a way that it can

  turn on a vertical sleeve 52 which has three bore holes

  53 and an external milled slot 54 which ensures the

  between the three bores 53 The slot 54 is dis-

posed on exactly 270.

  Four horizontal radial bores 55 formed in the block 56 communicate with the bores 53 and the slot 54 The bores 55 communicate with a cavity or a series of cavities 57 covering the four vertical surfaces of the block 56 A platinum plate 58 is bolted to each face of the block 56 and covers the slot or slots 57 The plate 58 has a large number of small holes 60 distributed over its entire surface Thus, a depression exerted in the sleeve

  central 52 is transmitted through the bores 53, 55 and the

  57 and gives a uniform suction effect in the central zone of the plate 58. This effect is maintained during 2700 rotation of the turret, optimally, and it

  is only deleted in the last range

  rotation angle of about 5, when the bore 55 has

  3 is completely separated from the slot 54. In its last marked position, the evacuation bore 61 ensures the communication with the outside and the depression exerted on the plate which is at this position is completely eliminated. This deck is then at

  evacuation station of the printing press.

  A removable sheet 62 of a porous material is advantageously fixed on each plate so that the suction effect is evenly distributed more evenly over the entire surface of each plate. In an advantageous embodiment, this sheet material is only 'a weak elasticity

  ticity and therefore forms an ideal surface of platinum for the

  A suitable material is known by the name of

  nation "Vyon" and is available from Porvair Limited.

  This material has another advantageous characteristic It retains a slight transverse curvature, given an operation of apation performed on one side only of the sheet This one thus has the advantage, although it is

  nominally flat when it is on the plate 58, of

  come naturally to its curved form by elasticity when

  depression is suppressed so that it ensures evacuation

  the card placed before its surface.

  Such a set of plates is very useful

  simple since guiding elements intended for positioning

  and keeping the cards on the decks are super-

  Thus, the entire surface of the cards is free for printing, and lines up to the edge can be used. In addition, a constant line can be formed on a

  edge of the plate so that it constitutes a reference

  rence for mounting all printing materials so that feeding and alignment is simplified The surface that is not covered by a blank can be hidden

by a sticky tape.

  Other arrangements can be used to

  that several impressions are made with one or more

  In a first variant, it is obviously possible to use a turret having more than four faces, for example six, and the turret must then rotate by the necessary angle. A second variant is represented. In this case, a turret 70 is made so that it rotates about a horizontal axis 71 The turret still rotates 900 but the four plates 72 are arranged at 90 in a single plane 73 The four stations still correspond food, the first impression, the second impression and the evacuation, the latter being

lowest position.

  Figure 6 shows a third variant in

  which a plate 80 moves alternately so that

  the is alternately located in the opposite position in front of

  two printheads 81, 82 that move alternately

  on a cart, but not in translation with respect to the

  platinum Another variant is shown in FIG.

  In this case, a continuous belt 90 passes in front

  Tine fixed but elongated 91 suction The belt 90 is porous and a printed card introduced to the location

  92 is retained on the belt A first head 93 of

  The pressure can make a first impression before the card is placed in a second position 94 by moving the belt. In this position, a second head 94 can provide printing. Another movement of the belt moves the card away from the effect of the suction plate. 91 so well

it is evacuated at point 96.

  Of course, various modifications can be made by those skilled in the art to the devices and methods which have just been described solely as examples.

  non-limiting without departing from the scope of the invention.

Claims (1)

1 Platen printing press, characterized in that it comprises a plate (12) having internal passages (53, 54, 55) providing communication between an external connection member and the front face of the plate. and a suction device connected to the external connecting member, so that a printed sheet material can be retained on the board by suction for printing. 2 Press according to claim 1, characterized in that the front face of the plate (12) is covered with a platinum plate (58) having a plurality of holes (60) communicating with the internal passages. 3 Press according to claim 2, characterized in that the front face of the plate of the plate (58) is covered with a sheet of a porous material. 4 Press according to claim 3, characterized in that the porous material is elastic. Press according to any one of the preceding claims, characterized in that it comprises a plurality of plates (12) arranged around a rotating turret (12), the turret having a central sleeve (52) arranged axially, the plates having radial bores (55) which communicate at least a portion of the time with the central sleeve (52). Press according to claim 5, characterized in that it comprises a plurality of plates and the turret (10) rotates intermittently so that it allows the execution of different functions substantially simultaneously to the different plates, the central sleeve (52) having apertures (53) which communicate with the radial bores (55) of the plates except one at a given time. 7 Press according to claim 6, characterized in that it comprises the substantially simultaneous execution of a loading operation of a first platen, printing operations to one or more other platens, and an operation unloading ration to a final plate, the radial bore of the latter plate not being in communication 13179 with the sleeve (52). 8 Press according to any one of claims 1 to 4, characterized in that it comprises a plurality of plates disposed on an axial end surface of a rotary turret (70) and one or more printing stations are arranged opposite turntables. Press according to one of the claims   1 to 4, characterized in that the plate (83) is mounted so that it can move alternately in a   first direction in relation to one or more   pressure (81, 82) which are mounted so that they move in perpendicular direction.   Press according to one of claims 1 and 2, characterized   characterized in that it comprises a continuous belt (90) formed of a porous material and passing in front of the plate so as to   it moves along it a sheet material.