US1867256A

US1867256A - Method of and apparatus for drying sheets in multicolor intaglio printing

Info

Publication number: US1867256A
Application number: US364268A
Authority: US
Inventors: Egli Arnold
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-05-19
Filing date: 1929-05-18
Publication date: 1932-07-12
Anticipated expiration: 1949-07-12

Description

July 12, 1932. A, "EGLl I 1,867,256

METHOD OF AND APPARATUS FOR DRYING SHEETS IN MULTICOLOR INTAGLIO PRINTINGv Original Filed May 18, 1929 Fig.5

lowed again by a cold air re resented in side Patented July 12, 1932 UNITED STATES PA'TENT OFFICE ARNOLD EGLI, OF HAMBURG, GERMANY METHOD OF AND APPARATUS FOR DRYING SHEETS IN MULTICOLOR IN'IAGLIO PRINTING Application filed May 18, 1929, Serial No. 364,268, and in Germany May 19,

1928. Renewed November peated taking 1n of color; besides the dried sheet would seldom be in a suitable condition for a further application of color.

The present invention provides a novel method and apparatus for the quick drying of the imprinted color wherein the paper is not disadvantageously influenced.

In accordance with said invention warm air is blown upon the printed sheet after each color printing operation the warm air being dried in certain cases. old air is then blown upon this sheet, the air being moistene when required. The application of the last color is preferably-followed by a warm air treatment for some considerable time foltreatment on the receiving table.

This heated air is blown against the freshly printed sheets in accordance with the invention, especially when the back of said sheets is placed against a surface which is a good conductor of heat; said surface being coole when required.

The drawing shows diagrammatically an method, wherein Fig. 1 represents the general arrangement and Figs. 2-4 the top plan views of details elevation in Fig. 1,'

i 2 showing a top view of a warm air blasting device,

Fig. 3 being a plan view of the cold air blasting device and Fig. 4 a top view of the warm air supply for the completely printed sheets- Fig. 5 shows a section through the shaft of the impression cylinder and the feed and d sufiicient to dry drain pipes of the cooling means leading to and coming from the cooling chambers of the impression cylinder.

The sheets 4 to be printed are conveyed to the crown of the impression cylinder, where they are caught by the claws 2 associated with the impression fields 2. With each revolution of the impression cylinder 1 one color is impressed upon a sheet through a printing cylinder 3, after which the freshly printed sheet must be dried before the sheet is printed by a second printing cylinder.

The drying during the rotation of the impression cylinder is effected as the latter revolves by causing the sheet to pass an air blower box 5 which is supplied with compressed air by a compressed air pipe 5 and equipped with a great number of air nozzles directed towards the impression cylinder and marked by little arrows in the drawing indicating the discharge of air. I

The box 5 is divided into a number of separate chambers k, 70, arranged in the direction of the impression cylinder shaft as will be seen from Fig. 2.

Electric heating elements 6 arranged in the chambers k, k" are suppliedby the current generator 20 and are regulated separately at 21.

The warm air is blown thus through the openings 5" upon the printed sheet when the latter is passing the heating arrangement 5 and the chambers in, k" thereof and this blowing action the applied color.

Provision is also made for the dividing up of the space in the heating apparatus 5 I arrangement for carrying out my improved into chambers and the regulating of the heating in the several chambers so that more intensified heating and drying on such places of the sheet to which the colors are applied more thickly is accomplished. The ,air supply of the several chambers of the drying arrangement 5, 6 may also be regulated by way of throttling devies 22. The air can be dried by conveying the same through the drier 23, or it can be conveyed to the heating elements 5 without being dried by closing the valve 24 and opening of the valve 25.

In consequence of the fact that the back of short duration will be 5 a good conductor of heat, prevents local heating, the temperature of the sheet is not changed except at thesurface exposed immediately to the hot air flow. There are, however, printing colors which take an exceedingly long time to dry, necessitating the employment of a s'tronglyheated air current in order to attain a suflicient drying of the print mg color during the short time intervals the printed sheet is passing through the hot air current. To keep the temperature of the sheet constant also in such a case the cooling effect of the impression cylinder is increased. According to the present invention, this is accomplisheflhrough the arrangement of cooling chambe 34 in the impression cylinder, wherein thee oling chambers 34 are connected to each other by way of pipe lines, 35, the last cooling chambers being directly connected with the supply and discharge line of the cooling means. For this purpose, as is shown in Fig. 5, the shaft 36 of the impression cylinder 1 is provided with bores 37 and 38.

Rings

41 and 42 slide in grooves 39 and in theshaft 36, said rings having hollow spaces 43 and 44, which on one side are continuously connected with the bore holes 38 and 37 of the shaft, on the other side with a supply pipe 46 and with a discharge pipe 47, respectively, for the cooling means. The slip rings are divided at '48 and 49 to allow the mounting of same on the shaft grooves. They are rigidly supported in the engine frame at 50.

Rings

51 and 52 are shrunk at a suitable place upon the shaft 36, said rings revolving with the shaft in contradistinction to the

stationary rings

41 and 42, and are connected with the last cooling chambers 34"by way of the lines 53 and 5 4. Cooling water, is supplied to the stationary pipe line 46, this cooling water flowing constantly through the ring shaped hollow space 43 into the hole 38 whence it flows by way of pipe line 54 into one of the last cooling chambers 34'.. The cool ing means, after flowing through all the

chambers

34 and 34 by way of the pipe connections 35, is drained from the other chamber 34 by way of pipe line 53 into the stationary cooling means discharge line 47 through the hole 37 and the hollow space 44.

The sheet, after passing the device 5 and before passing the printing cylinder to get a new color impression, passes a blower device 7 which directs a strongblast of cold air and, when desired, of moistened air against said sheet. The vapors produced by the heated air are in this manner blown away. The cold air current rests the sheet into the state it was in before the first print. The sheet may also be slightly moistened by such cold blast insures that the sheet arrives conveying cooling air,

table until another sheet arrives. By these.

ness of the sheet would cause a deficient a sorption of color.

This second air treatment, together with the cooling effect of the impression cylinder,

in a suitable condition at each impression operation with the printing cylinders 3.

The sheets which have received their last imprint, must-be dried a little more, than after the previous impressions because the third colorthe blue color-requires the most time to dry. The sheet is therefore caught after passing the hot air openings 5 three times, by the claws 8 of the revolving crossed arms 9 for leading it to the delivery table 10.

'On its way to the table 10 the printing side of the sheet passes the pipes 11 coming from the upper ends of the device5, or of the chambers is, k and is thus swept by heated compressed air. This warm air forces the back of the sheet against a sheet metal cover 12 in such a way that the back side is kept relatively cool. To insure this cooling eflect of the cover 12, a pipe 13 may be employed to dischargea cooling ,means, for instance water upon said cover. In this way the same result is accomplished as with the metallic shell of the impression cylinder 1, namely that the drying eifectis limited to the surface of the treated sheet. By these means the gaseous oils of the printed color are removed; as the heat transmission from the printed side of the sheet to the cold face supporting it is much larger than the heat'supplied by way of the warm air, an undesirable drying of the paper need not be feared.

- The sheet, completely printed and dried on its surface, is then blown through pipes '14, against the delivery means the sheet returns to its initial state of dryness.

In the embodiment of the invention illustrated the

cooling arrangements

7 and 14 receive their cold air by way of a cooling apparatus 17 from a pipe 18, moistened air being added through a feed line 19 by means of the spray 26. In the same way, by means of pipes 15 and 16, connected with the cold air line 27 and provided .With

suitable delivery nozzles

28 and 29, the sheet between the printing cylinders is blown against the impression cylinder 1. The warm air pipe 5 receives its air from the blower 30, and the cold air pipe 27 its cold air from the blower 31, a throttling device 32 in the pipe 19 for moist air permitting the regulation of the addition of moist air to the cold air. The cool ing apparatus 17 receives its cooling liquid, such as cooling water, by way'of pipe 33.

I claim:

1. In a multi-color sheet intaglio printing machine, in combination, an impression cylinder, printing cylinders, movable towards the impression cylinder and away from it, means adapted to-convey different printing colors to the printing cylinders, boxes arranged around the impression cylinder and subdivided 1n the direction of the shaft of the impression cylinder, means for supplying the several boxes with compressed air, means for regulating the compressed air supply of the several boxes, said boxes constructed with discharge nozzles on the sides facing the impression cylinder, heating arrangements for heating the air discharge by the individual boxes, and means for changing the degree of heating of such air.

2. The improvement in the art of drying rinted sheets in multi-color intaglio printing, which comprises directing a stream of heated air on the printed surface of a sheet while simultan usly holding the rear face of such sheet agai st a cooled surfaceto keep the body of such sheet cool.

3. The improvement in the art of drying printed sheets in multi-color intaglio printing, which comprises directing a stream of heated dried air upon the printed surface of a sheet while simultaneously holding the rear face of such sheet against a cooled surface to keep the body of such sheet cool.

4. The improvement in the art of drying printed sheets in multi-color intaglio printing, which comprises directing a stream of heated air upon the printed surface of a sheet while simultaneously holding the rearface of such sheet against a cooled surface to keep the body of such sheet cool, and directing a stream of cold air upon the printed surface of said sheet before applying the next color thereon.

5. The improvement in the art of drying printed sheets in multi-color intaglio printing, which comprises directing a stream of heated air upon the printed surface of a sheet while simultaneously holding the rear face of such sheet against a cooledsurface to keep the body of such sheet cool, and directing a stream of cold moist air upon the printed surface of said sheet before applying the next color thereon.

6. The improvement in the art of dryingprinted sheets in multi-color intaglio printing,vwhich comprises directing a stream of heated'air upon the printed surface of a sheet while simultaneously holding the rear face of such sheet against a cooled surface to keep the body of such sheet cool, directing a stream of cold air upon the printed surface of said sheet before applying the next color thereon, and blowing heated air against the printed surface of the sheet after the application of the last color, while simultaneously holding Ehe rear face of the sheet against a cool surace.

7. The improvement in the art of drying printed sheets in multi-color intaglio printing, which comprises directing a stream of heated air upon the printed surface of a sheet while simultaneously holding the rear face of such sheet against a cooled surface to keep the body of such sheet cool, directing a stream of cold air upon the printed surface of said sheet before applying the next color thereon, blowing heated air against the printed surface of the sheet after the application of the last color, while simultaneously holding the rear face of the sheet against a cool surface, depositing the completely printed sheet and directing a stream of cold air thereupon.

8. The improvement in the art of drying printed sheets in multi-color intaglio print ing, which comprises directing a stream 0 heated air upon the printed surface of a sheet while simultaneously holding the rear face of such sheet against a cooled surface to keep the body of such sheet cool, directing a stream of cold air upon the printed surface of 'said sheet before applying the next color thereon, blowing heated air against the printed'surface of the sheet after the application of the last color, while simultaneously holding the rear face of the sheet against a cool surface, depositing the completely printed sheet and directing a stream of cold moist air thereupon.

9. In a multi-color intaglio printing machine, in combination, an impression cylin der, a plurality of printing cylinders movable toward and away from the impression cylinder, means for cooling the surface upon which a sheet to be printed rests, and means for directing a stream of heated air upon the printed surface of such sheet.

10. The combination as set forth in claim 9, including means for drying said heated air.

11. In a multi-colo'r intaglio printing ma chine, in combination, an impression cylinder, a plurality of printing cylinders movable toward and away from the impression cylinder, means for cooling the surface upon which a sheet to be printed rests, means for directing a stream "of heated air upon'the printed surface of such sheet, and means for directing a stream'of cold air upon a printed sheet prior to the application "of the next color. I

12. The combination as set forth in claim 11, including means for moistening the stream of cold air. j

13. In a multi-color intaglio printing machine, in combination, an impression cylinder, a plurality of printing cylinders movable toward and away from the impression cylinder, means for cooling the surface upon which a sheet to be printed rests, means for directing a stream of heated air upon the printed surface of such sheet, gripping mechanism arranged to strip the printed sheet from the impression cylinder and including a plurality of gripping.- arms,'-a cover concentric with the path of movement of said gripping arms, conduits arranged between,

said arms, means for feeding heated air to said conduits, nozzles at the outlet ends of said conduits for discharging the heated air' 5 against the printed surface of the sheet, and means for cooling said cover.

14. In a multi-colorintaglio printing machine, in combination, an impression cylinder, aplurality of printing cylinders movm able toward and away from the impression cylinder, ineans for cooling the surface upon which a sheet to be printed rests, means for directing a stream of heated air upon the printed surface of such sheet, gripping mechanism arranged to strip the printed sheet from the impression cylinder and including a plurality of gripping arms, a cover concentric with the path of movement of said gripping arms, conduitsarranged between said arms, means for feeding heated air to said conduits, nozzles at the outlet ends of said conduits for discharging the heated air against the printed surface of the sheet, means for cooling said cover, a delivery table,

conduits arranged above said table, means for conducting cold air to said conduits, and nozzles at the outlet ends of said conduits for directing such cold air against a freshly deposited sheet,

80 ARNOLD EGLI.