US2270374A - Intaglio printing - Google Patents

Description

1a... 20, 1942. 5. KANITZ INTAGLIO PRINTING Fi led Oct. 25. 19:59

3 Sheets-Sheet l Jam 1942- KANITZ 2,270,374

, INTAGLIO PRINTING Filed Oct. 23, 1939 3 Sheets-Sheet 2 Jan. 20, 1942. G. KAN |TZ 2,270,374-

INTAGLIO PRINTING FiledOct. 23. 1939 3 Sheets-Sheet 3 Patented Jan. 2c, 1942 UNITED STATES PATENT OFFICE INTAGZZ PBIN TING Georges mu, Saint-Cloud, France- Application October 23. 1939, Serial No. 300,862 26, 1938 ficiaims.

.It is known to usev in intagiio printing, ma-

' rolls of substantially identical diameters to be used.

It is also known to use in intaglio printing, ma-

;chines that print on paper in reels; they ofier the advantage of enabling printing rolls of widely I diiferent sizes to be used; on the other hand, T iythey do not allow of printing on sheets of paper, and still less of passing the sheets through the machine several times, in order to effect printing a Y in a plurality of'colours.

' The object of the present inate these drawbacks. The presserroll is covinvention is to elimered with.rubber, without any system of nippers.

R For gripping the sheet accurately, the present invention provides for the stoppage of the rotation of the printing roll before the presser roll is pressed against'the surface of the printing roll,

or more correctly against the sheet of pap which is engaged at that instant between the presser roll and the printing roll.

The rotation of the printing roll is obtained in any known manner. However, the driving force is not stopped when the roll stops. but continues to. act on same uninterruptedly in the direction of the rotation, through a friction or other nonrigid transmission. The stoppage of the printing roll ata predetermined spot of its circumference is effected by the downward movement of the pressure system, before the presser roll conies into proximity with the printing roll.

-. -The sheet' to be printed is -previousiy placed in v the correct position on the margining table, so.

that its front edge is beyond the line of contact between the printing roll andthe presser roll.

In order to prevent the sheet which thus passes over the inked printing roll from becoming dirty and from being moved out of position. the front edge of the margining table is movable. It can move up to the board in front or the presser roll that carries the projections, and thus form a continuous supportfor the sheet, enabling same to be correctly positioned. It will then be moved backwards to enable the presser to move downwards on to the printing roll. The presser, having moved down on to said printing roll whichis (cl. ion-2:2)

when the sheet to be printed is gripped, the accuracy of this operatiomis greatly facilitated.

The presser roll then bears on the paper and this rotation feeds the sheet at the same time as it is printed. I

The stoppage of the printing is produced by the presser roil's moving away from the sheet and from the printing roll.

In order to release the printing roll and enable it to rotate, the stopping device is withdrfln when the pressure reaches a predetermined value.

An embodiment of the machine according to the invention will now be described with reference to theaccompanyihg drawings in which:

Fig. 1- shows a general view of the machine;

Fig. 2, a view on a larger scale of the marginingdevice of the machine;

Fig. 3, a section along IIL-III of Fig. 1;

Fig. 4, a side elevation of Fig. 3.

The printing roll I is mounted with its shaft 2 on the rollers 3 whichjorm bearings. The liftingapparatus ll-li-lt-l'I-ll, formed by a rack, pinions, a worm, a worm wheel and an actuating crank, is used to raise the rolls of difmined by the position of the margining table 4.

The whole arrangement is mounted on the car- 7 riages l3 and M which move along the machine on the base 5 to enable rolls of different lengths to be printed on the same machine. The movement of said carriages is obtained by means of the crank it and the screw 41 which is provided with aleft hand the bearings of rollers I remain symmetrical with respect to the plane of symmetry of the machine. The presser bearings I! slide in the guideways 2| oi the frame 2| (in order to simplify the drawing. onlyv .ione sidesot theimachinahasshown). I The hearing I! carries the rubber covered presser roll I and the rigid counter-presser roll 0; its upward and downward motion is imparted by a known mechanical or hydraulic means, electric contacts. In Fig. 1, the mechanism of the upward and downward motion has been shown by square-threaded worms 24 and-worm wheels 2|, 2|".

The rotary movement of the printing roll is imparted by the motor 4| which drives the loose 5o pulley 2! by means or a belt, and the sleeve 28 and the roll I by means of the friction band II (Figs. 3 and 4). The device for stopping the rostationary, therefore clamps the sheet to be tation of the printing roll I is formed on the one printed, in a definite position. Owing to the hand by the pin I which is arranged in housings elimination of the dynamic factors at the instant I: I on the bearing is and is held by the connectferent diameters to the operating'height deter-- I and a' right hand thread so that the travel being limited for example by ing rods n, n, and on the other hand by the sleeve 21 (fixed on the shaft 2 of the roll I) provided with a notch 26.

When the system 1, I, I9 is remote from the roll I, the latter rotates freely (see Fig. 2). As

' the downward movement of the pressure system is produced through the motor 39, the pin 9 encounters, as it moves downwards towards the roll, the notch 26 of the sleeve 21 and stops the roll I in a predetermined position.

In order to decrease the impact between the parts 9 and 21, a mechanical, electrical or hydraulic braking system, not shown in the drawing. is provided which acts on the rotating mass .of the roll I during. the period prior to the contact between said parts.

The actuating motor 4i does not stop acting through the system 28, 29, I. on the roll I in the direction of the rotation, even during the stoppage caused by the pin 9, in order to prevent' any reverse motion of the roll. The actuating device- II may be adapted solelyto rotate the roll I when the pressure of the roll I is not being exerted, that is to'say when running light. It may be assisted, at the instant when the sheet to be printed passes and when the presser roll I bears-against the printing roll I, by the actuating device which is more powerful. The latter acts through the pulley 43 on the counterpresser 8 which transmits the force to the presser 'Iand thence to the roll I by friction.

The pressure system is moved away from the roll I by means of the motor 3! by reversing its direction of rotation for the downward movement.

The feed table 4 is provided with a movable table portion 5 which, being actuated by the crank C and driven by the racks and. pinions 34 and 32, can move towards the presser and even beyond its line of contact with the printing roll. It can be moved backwards to leave room for the presser I. On the same driving shaft 25 are mounted sheet-flatteners II for.

holding the margined sheet when the table moves ,backwards. It is of course understood that the sheet-flatteners may be mounted on another shaft andbe actuated independently before the movement of the table portion 5. In front of the roll I, on the opposite side to the feed table is located the stripper I35, and the front gauge ing the presser bearing IS, the presser roll I, the

counter-presser 8, and also the pin system 9- I-II-I2-I3, is moved away from the roll I, which continuesto rotate without stopping (Fig. 2). A sheet is placed on the feed table I, the table portion is moved forwards by means of the crank 0 up to the board I" (see Fig. 2) and the sheet 31 is allowed to slide up to the projection 36. It is of course understood that on this machine there also exists a socailed side gauge which limits the position of the sheet in the longitudinal direction. When the sheethas been margined, the table portion the roll I.

5 is moved backwards by rotating the crank 6 in the direction of the arrow, which has the eifect of lowering the sheet flatteners 33 on the table so that they keep the sheet in its correct position.

The pressure system is then lowered towards Before the presser I comes into contact with the roll I, the pin 9 enters the notch 26 of the sleeve 21 and stops the roll I rotating (Fig. 2). As the downward movement of the pressure system continues, the presser I comes into contact with the sheet 31 and presses it in its correct position against the roll I. If the downward movement of the pressure system is further continued, the presser 1 being held stationary on the surface of the roll I, the screw 22 will compress the spring 25 and the movement of the rack I3 will actuate the pinion I2 and the lever I l in the direction of the arrow (see Fig. 1) and, by means of the connecting rod III, will withdraw the pin 8 from the notch 26. The roll I being thus released I will start rotating again through its friction drive 4I-28293II, carrying with it the sheet 31. The drive ll may be helped or replaced by the drive 40 which will only start rotating when the spring 25, by means of the connecting rod III and the lever II has moved the pin 9 out of the notch 28, which can be effected by means of an electric contact not shown.

, The sheet 31 is grasped by its front edge at 35. Said sheet issues printed from the machine at the speed of rotation. of the roll I.

Before the sheet 31 has completely passed under the presser I the motor 39 moves the latter away from the surface of the roll I.

When the printing of the sheet is completed.

only the roll I continues to rotate,.up to the instant when a second sheet has been margined and the operation begins again.

For printing a second colour on the same sheet, the second roll is placedon the machine by fixing the driving sleeve 28-28-30 and the sleeve 21 on the shaft 2 of the roll I. The sleeve 21 is moved in the circumferential direction until the notch 26 comes approximately opposite the same spot of the engraving as on the first roll. The accurate registering can be obtained by means of gauges 36 which are adapted to undergo very-considerable movements, such movements being in no way hindered by the nipper system, as is the case in the other machines for printing sheets. All the other operations remain invariable.

While I have illustrated and described the pre- -ferred form of construction for carrying my invention into effect, this is capable of variation and modification, without departing from the spirit of the invention. 1 therefore do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

What I claim is:

1. In an intaglio printing'machine the combination comprising a printing roller, means for raising and lowering said printing roller. a presser roller adapted to cooperate with said printing roller, a counter-presser roller cooperating with said presser roller, means for moving said presser roller towards and away from said printing roller, means for rotating said printing roller and locking means for stopping said printing roller in a predetermined position before the printing operation.

ing roller.

j er roller adapted to v roller, a connter-presser roller cooperating with 2. In an intaglio printing machine the combination comprising a printing roller, means for raising and lowering said printing roller, a presser roller adapted to cooperatewith said printing roller, a counter-presser roller cooperating withsaid presser roller, means for moving said presser roller towards and away from said printing roller, means for rotatin said printing roller and means tor-locking said printing roller in predetermined position before said presser roller. upon its movement 4.Inanintagli0printingmachinethecombibefore said Dresser: roller towards said printing roller I 7' P i t against sai D m -v tor restarting the rotation of said printing roller after complete [contact has taken place between said presser ig.

roller and said printing roller.

machine the combimeans for rotating said printing roll-1 said printing roller in pre- 'ingmeans.

er roller towards and away from said printing roller, means for rotating said printing roller and locking means for said printing roller controlled by the relative positions between said presser roller and said printing roller.

5. In an intaglio printing machine the combination comprising a printing roller, means for raising and lowering said printing roller, a presser roller adapted "to cooperate with said printing roller, a counter-presser roller cooperating with said presser roller, means ior'moving said presser roller towards and away-from said printing roller, means for rotating said printing roller. locking means for said printing roller controlled by the relative positions between said presser roller and said printing roller and driving means for said counter-presser roller designedtocooperate 6. man intaglio printing machine the combination comprising a printing roller. means -ior L raisin ggand lowering said printing roller, a pressnationcomprising a printing roller, means for raising and lowering said printing roller, a press to with said printing er roller adapted to cooperate with said printing roller, a counter-presser roller cooperatin with said preset roller, means for moving said presser roller towards and away from said printing roller. means for rotating said printing roller and locking means for stopping said Printing roller in a predetermined f'position before the printing j'operation, said means for rotating said printing which operates roller comprising a slipjdrive during the lockingof said printing roller.

, GEORGESKANI'IZ.

, said presser roller, means for moving said presswith said printing roller driv--

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