US2104985A - Intaglio printing device - Google Patents

Description

Jan. 11, 1938. GURWICK INTAGLIO PRINTING DEVICE Filed July 14, 1936 [206% Fol/g (mama/4;,

Patented 11, 1938 PATENT OFFICE INTAGLIO PRINTING DEVICE Irving Gurwick, Mount Vernon, Ohio, assignor to Shellmar Products Company, Mount Vernon, Ohio, a corporation of Delaware 1 Application July 14,

2 Claims.

allel t' the face of the cylinder and a doctor.

mechr 11am for wiping the cylinder at a non-axial angle.

Still another object is the provision 'of an intaglio printing unit which may be operated with a reduced tendency for wear on the etched design. i

These and other objects will be evident upon a consideration of the following description and by reference to the accompanying drawing, in which Fig. l is a top view partly in section taken along line l-fi of Fig. 2 of an intaglio printing unit constructed in accordance with my invention, the unit being shown as isolated from an intaglio printing machine;

Fig. 2 is a side view of the device shown in Fig. 1; and

Fig. 3 is an end sectional view taken along line 3-3 of Fig. 1.

Intaglio printing devices have been used for many years for the printing of various materials. In particular, devices of this character have been found to be of great utility in the printing as of transparent cellulose sheeting such as the product known as Cellophane." In my Patent .No. 2,024,354, issued December 17, 1935, is described an intaglio printing machine which is highly successful in printing materials of the 40 type described. The unit shown in the drawing may be employed in the machine of thispatent or in other suitable intaglio structure. Only so much of theprinting. device as is necessary for an understanding of the invention has been de- 45 scribed.

In the drawing, the intaglio printing unit includes a main drive shaft indicated at In having a gear I mounted thereon. This gear meshes with and drives a gear l2 which is rigidly at- 50 tached to shaft l3 extending transversely of the unit. Shaft I3 is rotatably mounted in a frame structure I 4 and has an inwardly extendmg flange portion l5 which is engaged by the laws It. The jaws it are attached to shaft ll 55 of a printing cylinder l8, shaft I! also extend- 1936, Serial No. 90,542

ing on the opposite side of the cylinder. Shaft ll customarily is journaled in the sides of a color bath I9 shown in Fig. 3. on the opposite side of the printing cylinder from the jaws l5 engage and drive a flange 20 which is journaled in the frame structure 2| and united to an outwardly extending shaft 22.

Shaft 22 rotates at reduced speed, by means of a suitable worm drive indicated generally at 23, a shaft 24 which extends parallel to the frame 2|. The intermediate portion of shaft 24 is journaled in a frame unit 25, as shown in Fig. 1. To the opposite end of shaft 24 is mounted a crank disk 26 having a diametrically extending T-slot 21. A lever 28 has an end portion secured at a suitable point in the T-slot 21 The laws 69 by means of the nut 29. The opposite end of v lever 28 is pivotally mounted at 29 between the jaws of a yoke 30 which is'rigidly mounted by means of a suitable pin connection shown at 8! to a shaft 32. Shaft 32 is received by a frame unit 33 which is mounted in vertically adjustable relation with the frame unit 21 by means of the frame extension 34.

The inner end of shaft 32 carries one section 35 of a universal joint. Upon section 35 is clamped a horizontally extending arm 36 to which is attached a downwardly depending rod 31 bearing weight 38. The other section 39 of the universal joint is attached to a doctor blade carrying arm 40. A plate 4| is adjustably secured to arm 40 by means of the set screws 42 and slots 43. The doctor blade 44 is clamped between plate 4! and a lower plate 45 and bears against cylinder I8 in the manner shown in Fig. 3. It is desirable to employ a baflle 46 beneath the lower portion of plate 45 in order to prevent splashing of ink from the rotating cylinder IS.

The rod 40 carries on the end opposite to the member 39 a corresponding section 41 of a uni-,- versal joint. This section is attached to a complementary section 48 in the usual manner of universal joints. Section 40 carries a horizontally extending'plate 49 to which is attached a downwardly depending rod 50 carrying weight 5!. Section 48 is attached to a shaft 52 which is journaled in frame unit 53. The frame unit 53 is carried by a frame unit and is adjustable'vertically therein. This adjustment is effected by loosening the set screw 55 and positioning the slot 56 properly to any desired position. The set screw then is tightened and a rigid position is assured.

In addition to the vertical adjustment aflorded by slot 58 and set screw 55 both ends of the docframe unit 54 is mounted to slide in avertical manner along the channel member-51 which is attached to the main frame unit It. A vertically extending screw 59 is rotatably mounted in a collar 60 of the frame unit and carries an upper gear 6|. The lower end of the screw is threaded into frame unit 54 and upon rotation of the screwthe frame unit and the doctor mechanism are altered in their vertical position.

Meshing with gear Si is a gear 82 which is carried on shaft 63 extending transversely oi the machine. One end of shaft 33 is journaled in frame I 4, as shown in Fig. 2 and the other end of the shaft is journaled in frame unit 2!. Adjacent frame unit 2! shaft 63 carries a gear. which meshes with a gear mounted on shaft 66, the latter being rotatably mounted in an extension 31 of frame unit 2| and having its lower end threaded into the frame unit 33. A hand wheel 88 is attached to the end of shaft 33. It will be seen that by rotation of the hand wheel 88 the entire doctor mechanism is raised or lowered as a unit. 1

In the operation of the device the etched cylinder I8 is driven as indicated by the arrow in Fig. 3 and the doctor blade 44 wipes ink from the unetched portions thereof, the weights 33 and 6| providing the necessary pressure for this purpose.

The doctor mechanism is mounted in such manner that the doctor blade is presented to the printing cylinder l8 along the line which is not parallel to the axis of rotation of the cylinder. That is, as will be seen from Figs. 1 and 2, the doctor blade is set at a non-perpendicular angle to the direction of rotation of the printing cylinder. I have found that this type of wiping effect results in the production of an improved printing design and that there is less of a tendency for the blade to damage the etched portions of the cylinder, particularly the portions which include horizontal lines. In following the contour of the cylinder, the blade is slightly curved. The position of the blade prevents the blade from digging into the etched design. Where the blade has the eflect of digging into the etched lines, there is a deficiency of ink in one part of the line and a tendency for this line to be printed light along one edge. Also, the angular positioning of the doctor blade prevents the blade from bouncing tor mechanism are vertically adjustable. The

against the following side of etched lines of the type described.

The worm gearing indicated generally at '23 provides for a slow rotation of shaft 24 which drives the crank disk 26. As the crank disk rotates, the arm 28 causes the yoke 30 to be moved transversely of the machine, thereby impartingtransverse motion to the entire doctor mechanism. Shaft 52 merely slides in the frame unit 53 and as the motion of this shaft and the shaft 32 are horizontal, the angular mounting of arm fill necessitates action of the universal joints during the reciprocal movement.

The angular position of the doctor blade is provided by setting the frame unit 54 at a different level from the level of frame unit 33, as will be seen in Fig. 2. The doctor blade carrying plate ll then is positioned so as to present the doctor blade 34 continuously along the cylinder it asdescribed. Once the proper arrangement is provided, the entire unit may be raised and lowered by the operation of the hand wheels 68 without disturbing the relative position of shafts 52 and 32.

As before stated, the intaglio unit described is suitable for use in connection with any intaglio printing device. Such devices include the usual standard equipment, such as impression cylinders and means for drawing a web through the machine between the impression cylinder and the r universal joints on the ends of said carrier, hori-' zontal shafts connected to said universal joints in different vertical positions, and means for transversely reciprocating said shafts.

2. In a device of the type described, a printing cylinder, a doctor blade mounted adjacent said cylinder in angular relation with respect thereto, universal joints mounted adjacent the ends of said blade, offset shaft members mounted on said universal joints, and means for moving said shaft members back and'forth.

mvme GURWICK.

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