US2574941A - Conveyer belt printing machine with multiple impression - Google Patents

Description

Nov. 13, 195] J TROZMULLER 2,574,941 CONVEYER BELT PRINTING MACHINE WITH MULTIPLE IMPRESSION Filed July 12 1949 INVENTOR.

Patented Nov. 13, 1951 CONVEYER BELT PRINTING MACHINE WITH MULTIPLE IMPRESSION Friedrich Josef Triizmiiller, Vienna, Austria, as-

signor to Semperit Osterreichisch-Amerikanische Gummiwerke Aktiengesellschaft, Vienna,

Austria Application July 12, 1949, Serial No. 104,176 In Austria August 14, 1948 6 Claims. I The invention relates to a printing machine for letter pressprinting operating with conveyor belts as carriers of the printing blocks, and has the object of providing a machine of this kind with which the printing can be effected on several side and printing on back side is diagrammatically represented by Way of example, but not of limitation, in the accompanying drawing, in which:

Fig. 1 in a diagrammatic view of the printing machine; I 1

Fig. 2 in an enlarged detail sectional view of the cuttingand folding device; and

Fig. 3 is an elevational view of the cuttingand folding device showing the driving. gear for this device.

Printing can be made on four paper bands simultaneously, and while the machine illustrated is a very suitable former embodiment of the invention, modifications thereof will suggest themselves to those skilled in the art, and I wish to be understood that the scope of my invention is defined in the claims at the end of this specification, and is not limited to the embodiment shown.

In the embodiment shown there are provided two carriers for the printing blocks (forms) 4, which carriers consist of endless steel bands I and I I, respectively, running vertically over driving and guide rollers, 2, 3 and l3, M, respectively. On these bands the elastic and flexible printing blocks 4 are attached. These blocks adapt themselves to hug the curvature of the rollers 2, 3 and l3, M, respectively While passing over them and assume again a flat condition when running along With the band on its straight stretches between the rollers.

On each side of the drivingand guide rollers 2, 3 and I3, M, respectively, there are four endless belts or bands '5 and Ill running over transport rollers 6, I. These belts 5 and I0 serve for the adjustment and transport of the paper as will be described later. These transport rollers 6 are journalled parallel and in one plane with their associated guide rollers 2,3 and 13, I4, respectively, and effect the printing by pressing the paper band against the printing blocks 4.

Between adjacent transport rollers B there is provided at least one inking device 8, so that each carrier of printing blocks has at least four associated inking devices which ink in the printing blocks 4 on their way to the corresponding transport roller 6. Each inking device may comprise an endless steel band 18 co-acting with a distributing roller 1 9. Supply of ink to the band [8 is effected by a supplying roller 26 and a transmitting roller 2|. Two of the four inking devices co-operating with the printing blocks 4 of the bands I and II, respectively, are arranged opposite to the drivingand guide rollers 2, 3 and 13, M, respectively. The other two inking devices are arranged adjacent to the straight stretches of the bands I and II, respectively, and opposite to rollers 22 arranged inside the said bands.

The paper bands are drawn off from four blank paper rolls 9 and are passed first over the adjustment and paper transport belts 5 to the printing blocks 4 of the printing block carrier I which effect the printing on the upper side. From the adjustment and paper transport belts 5 arranged between the printing block carries I and II the paper bandsrun over the adjustmentand paper transport belts I0 towards the printing blocks 4 of the printing block carrier l l.

The paper bands drawn-off from blank paper rolls 9 arranged outside the carriers of the printing blocks are then, after the printing on the upper side has been effected, passed over the deflector rollers 15 and the adjustmentandpaper transport belts Hi to the carrier ll of printing blocks in order to effect the printing on the back side.

The paper, which is then printed on both sides, is passed subsequently to the cutting-and folding devices by deflecting rollers 23, 24, and is deposited in piles 25.

Each cutting device comprises a roll 26 provided with a knife 21, and co-acting with a counterroll 28. The web of paper is fed between the rolls 26 and 28, cutting the paper into sheets which are folded by the folding device.

Each folding device comprises a folder 30, ,a folding drum 35 and a pair of belts 40 running over transport rollers 4|. The folder 38 is moved in a vertical directionby a reciprocating lever 31, pivotally mounted at 32 and controlled by a cam 33. In the folding drum 35 there are radially arranged four slots 36 cooperating with the folder 30 to fold the sheets of paper at the movements of said folder towards the center of the folding drum. After return of the folder 3B in its raised position the drum 35 and the folded paper pushed in the upright slot is turned about 90 in.the clockwise. .direction.- This is effected by aMaltese cross 31. Thus the folded paper comes in a horizontal position close to the draw-in mouth of the transporting belts 40, by which it is moved to right and is deposited in the pile 25.

In order to attain constant perfect synchronisation of the carriers I and II of the printing blocks with the adjustmentand paper transport belts 5 and In, which is essential for the prevention if displacements of the impressions, the circumferential velocity of the two groups of conveyer belts is brought into accurate agreement by means of synchronising components. In the embodiment shown the synchronising means comprise toothed, wheel-works. However, various other gears, suchas bevel gears or chain gears may be-used for the synchronising. the circumferential velocity of the different means for conveying the paper bands.

The main advantages of the printing machine according to the invention consist in a space-saving structure, the savings in material, weight and. costs, and in'the easy accessibility of the inkingand folding-devices.

What I claim as my invention and desire to secure by Letters Patent is:

l. A printing machine for letter press printing comprising, in combination, a first printin mechanism for printing on the upper side'and a secondprinting mechanism for printing on the back side of a web, each comprising elastic and flexible printing blocks, an endless conveyer band arranged as carrier of said printing blocks and adapted to run under tension over driving and guide rollers, at least two adjustment and paper transport means on each side of said conveyer band, each of said means including an impression roller adapted to cooperate with the straight stretches of the conveyer band, a guide roller and an endless belt arranged for running over said rollers and in substantially parallel and horizontal stretches between said rollers, blank paper rolls arranged close to theendless belts ofsaid first printing mechanism and adapted for feeding paper bands to said belts, and deflector rollers for leading at least theouter paper bands from the endless belts of the first printing mechanism'to the endless belts of the second printing mechanism.

2. A printing machine for letter press printing as claimed in claim 1, whereof the endless belts of both printing mechanisms lying between the endless conveyers of said mechanisms are arranged in pairs in such a way, that the incoming part of the belts of the second printing mechanism forms the continuation of the outgoing part of the belts of the first printing mechanism.

3. A printing machine for letter press printing comprising in combination, a first printing mechanism for printing on the upper side and a second printing mechanism for printing on the back side of a Web, each comprising elastic and flexible printing blocks, an endless conveyer band arranged as carrier of said printing blocks and adapted to run under tension over driving and guide rollers, at least two'adjustment and paper transport means on each side of said conveyer band, each of said means including an impression roller adapted to cooperate with the straight stretches of the-conveyer band, a guide roller and an endless belt arranged for running over said rollers and in substantially parallel and horizontal stretches between said rollers, blank paper rolls arranged close to the endless belts of said first printing mechanism and. adapted for feeding paper bands to said belts, deflector rollers for leading at least the outer paper bands from the endless belts of the first printing mechanism to the endless belts of the second printing mechanism, and synchronizing means arranged for accurately coordinating the circumferential velocities of said carriers of printing blocks and of thesaid adjustment and paper transport belts.

4. A printing machine for letter press printing comprising in combination, a first printing mechanism for printing on the upper side and a second printing mechanism for printing on the back side of a web, each comprising elastic and flexible printing blocks, an endless conveyer band arranged as carrier of said printing blocks and adapted to run under tension over driving and guide rollers, at least'two adjustment and paper transport means on each side of said conveyer band, each of said means including an impression roller adapted to cooperate with the straight stretches of the conveyer band, a guide roller and an endless 'beltarranged for running over said rollers and in substantially parallel and horizontal stretches betweensaid rollers, blank paper rolls arranged close to the endless belts of said first printing mechanism and adapted for feeding paper bands to 'said belts, deflector roll-' ersfor leading at least the outer paper bands from the endless belts of the first printing mechanism to the endless belts of the second'printing mechanism, synchronizing means arranged for accurately coordinating the circumferential velocities of said carriers of printing blocks and of the said adjustment and paper transport belts, and cutting and folding devices, arranged'for cutting the paper bands into sheets and folding said sheets.

5. A printing machine for letter press printing comprising in combination, a first printing mechanism for printing on-the upper side and a second printing mechanism for printing on the back side of a web, each comprising elastic and flexible printing blocks, an endless conveyer band arranged as carrier of said printing blocks and adapted to run under tension over driving and guide rollers, at least two adjustment and paper transport means on each side of said con-'- veyer band, each of said means including an impression roller adapted to cooperate with the straight stretches of the conveyer band, a guide of the said adjustment and paper transport-belts and at least an inking-in'means arranged between each adjacent impression rollers of consecutive adjustment and paper transport means and adapted to ink-in the printing blocks intermediate said adjacent impression rollers.

6. A printingtmachine for letterpress print-L ing comprising in combination, a first printing mechanism for printing on the upper side and a second printing mechanism for printing on the back side of a web, each comprising elastic and flexible printing blocks, an endless conveyer band arranged as carrier of said printing blocks and adapted to run under tension over driving and guide rollers, at least two adjustment and paper transport means on each side of said conveyer band, each of said means including an impression roller adapted to cooperate with the straight stretches of the conveyer band at the ends of said stretches, a guide roller and an endless belt arranged for running over said rollers and in substantially parallel and horizontal stretches between said rollers, blank paper rolls arranged close to the endless belts of said first printing mechanism and adapted for feeding paper bands to said belts, and deflector rollers for leading at 6 least the outer paper bands from the endless belts of the first printing mechanism to the endless belts of the second printing mechanism.

FRIEDRICH JOSEF TR'OZMCILLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 324,986 Crowell Aug. 25, 1885 509,528 Harper Nov. 28, 1893 769,296 Bender Sept. 6, 1904 15 1,214,538 Gill Feb. 6, 1917 1,223,347 Stoddard Apr. 17, 1917 1,855,525 MacArthur Apr. 26, 1932 2,031,063 Pesci Feb. 18, 1936 2,066,179 Keller Dec. 29, 1936

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