US1963585A

US1963585A - Lead for printing presses

Info

Publication number: US1963585A
Application number: US580332A
Authority: US
Inventors: Howard A Kittle
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-12-11
Filing date: 1931-12-11
Publication date: 1934-06-19
Anticipated expiration: 1951-06-19

Description

June 19, 1934. KITTLE 1,963,585

LEAD FOR PRINTING PRESSES Filed Dec. 11, 1931 Patented June 19, 1934 UNITED STATES- PATENT OFFICE 7 Claims.

The present invention relates to a lead for spacing type bars in a printing press and more particularly to a lead to be used on a printing press having a rotating impression cylinderor impression sector.

At the present time the impression surfaces of cylinders or sectors for printing presses are either cast in semi-cylindrical form or provided in electrotype form. In either case the impression surfaces may be securely fastened to the impression sector without difficulty in spite of the magnitude of the centrifugal forces present in the impression surfaces. When the same impression surfaces are to be used for large quantities of work, the expense of casting or electrotyping these surfaces is not objectionable. When, however, it is necessary or desirable to employ an impression surface which may be readily altered in whole or in part, it is difficultto secure the impression members, such as type bars, or slugs, within the rotating impression cylinder or sector.

Furthermore, the spacing of the type bars within an impression sector also presents a real problem, inasmuch as the centrifugal forces created in the spacing leads during rotation often move the leads out to and beyond the impression surface, thus causing the rulingof straight lines between the printed lines or striking adjacent parts is the provision of a lead forspacing type bars on a rotating impression sector, said lead being so formed that it cannot protrude up to or beyond the impression surface of the type bar.

Another object of the present invention is the provision of projections upon a spacing lead for rotating impression'sectors in a printing press which will not permit the movement of the lead toward the impression surface, in spite of the centrifugal forces created in the lead.

A further object of the present invention is the provision of a lead which is shorter than the associated type bar but which is provided with projections so that the lead will not protrude to or beyond the impression surface although end pressure cannot be exerted upon the a plurality of lateral projections spaced longitudinally along said lead.

Otherand further objects of the invention will be suggested to those skilled in thelprinting art, as the disclosure of the invention is developed hereinafter.

The above and other objects of'the invention are obtained by the provision of a lead for spacing type bars in a'printing press which is provided with laterally projecting ears spacedlongitudinally along the lead, said ears being adapted to engage or abut the shoulder usually existing on known forms of type bars.

Reference is made to theaccompanying drawing wherein similar reference numerals designate similar elements and wherein:

Fig. 1 is a perspective view of the preferred form of lead according to the invention.

Fig. 2 is a perspective view of 'a modified form of lead according to the invention.

Fig. 3 is a perspective view of the preferred form of lead showing its cooperation with a known form of type bar, a part of the lead being broken away to clearly disclose the complete formation of the type bar.

. Fig. 4 is a vertical cross-section through a lead and associated type bar taken on the cutting plane 44 of Fig. 3. V

1 Fig. 5 is a perspective view of an impression sector showing the relative position of lead and type bar therein and showing the known clamping means forcreating end pressure upon the type bars to hold them within the impression sector.

Referring first toFig. 5, the impression sector includes a frame 10 which is adapted to be attached in a known manner to the rotating part of a printing press. Segments 11 and 12 are secured in the frame 10, adjacent each endthereof. An electrotype holding member 13 is securely fastened to the frame 10 of the impression sector betweenthe end segments 11 and 12. The electrotype holding member 13 is provided on its convex surface with a plurality of undercut ribs 14, the spaces between ribs 14 being adapted to receive complementary ribs on the under surface of the electrotypes (not shown). I

The clamping meansv for holding the interchangeable impression members or type bars 15 within the impression sector comprises a movable segment 16, having a stud 17 sliding within the end segment 12 to guide and maintain the movable segment 16 within the impression sector, and a pair of bolts 18 threaded through the end segment12 and abutting the side of movable segment 16. 7 7

The type bars 15 are placed within the impression sector and are securely held in place by means of end pressure created by turning bolts 18 to bring movable segment 16 against the ends of type bars 15. It is customary to place sheets of rubber 19 between the ends of type bars 15 and end segment 11 and between the ends of type bars 15 and movable segment 16. The sheets of rubber 19 may be replaced by similarly shaped sheets of any material which is rugged, slightly compressible and of high friction coefficient.

The type bars 15 are circumferentially spaced within the impression sector by means of leads 20 which are preferably tapered in a vertical or radial direction. The construction thus far described is known in the printing art and presents the problem which the present invention is adapted to overcome.

If the leads 20 are merely coextensive with the type bars 15 the centrifugal forces created in the leads 20 upon rotation of the impression sector will move these leads out to the impression surface or beyond, with the dire results previous- .ly mentioned.

In order to meet this situation, it has been proposed to make the leads 20 longer than the type bars 15, but the sharp edges of the leads soon cut into the sheets of rubber 19 so that the centrifugal forces again move the leads radially to seriously hamper the printing operation. It should be noted that the end pressure provided by the clamping means is suificient to maintain the type bars 15 in place within the impression sector but this is only true because the type bars 15 are pressed back into place by each contact with the paper or surface to be printed.

The present invention now proposes the provision on the leads of projections which are adapted to engage the type bar so that the lead 20 is also held or moved back into proper position upon each contact of the impression surface with the surface to be printed.

In one form of the invention, see Fig. 1, these projections are in the form of ears 21 which are stamped out of the lead 20 and longitudinally spaced at intervals along the upper edge thereof. Since the leads 20 are vertically or radially tapered, the cars 21 are provided along the wider edge which is the upper edge.

A modified formation of spacing lead 20 is shown in Fig. 2. In this form the laterally projecting ears 21 are as before, placed at longitudinal intervals along the lead 20 but are also in spaced relation to the upper or wider edge of the lead 20.

The laterally projecting ears 21 engage a shoulder 22 of the type bar 15 when the lead 20 is placed adjacent thereto, as shown in Fig. 3. The type bar 15 is of usual construction having an inverted L-shaped cross-section and having a plurality of longitudinally spaced, vertical supporting partitions 23. It is quite clear from the vertical cross-section through the type bar 15 and lead 20 shown in Fig. 4 that the ears 21 abut or engage the shoulder 22 of type bar 15. Not only do the laterally projecting ears 21 and lead 20 keep the lead from moving radially out- Ward with respect to type bar 15 but the leads 20 are pressed back to position by the type bar 15 every time it makes contact with the surface to be printed. For this reason there is deemed to be novelty not only in the particular formation of the leads but also in their combination with the type bars held in an impression sector primarily by end pressure.

The present invention is quite susceptible to many variations and modifications such as changes in the spacing or placement of the ears 21 and modification of their provision either integrally or detachably on the lead 20.

Having now particularly described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a printing press, the combination with an impression sector revolubly mounted and a type bar frictionally held in said sector, of a lead for spacing said type bar, not connected to said sector and having projections engaging said type bar whereby the lead can not protrude beyond said type bar.

2. In a printing press, the combination with an impression sector revolubly mounted and a type bar having a shoulder and an impression surface thereon and frictionally held in said sector, of a lead for spacing the impression surface of said type bar, not connected to said sector and having projections engaging the shoulder on said type bar whereby the centrifugal forces set up in said. lead can not move the same with respect to said type bar.

3. In a printing press, the combination with an impression sector revolubly mounted, a type bar having an impression surface and a longi tudinal shoulder and a clamping means on said sector for frictionally holding the type bar therein, of a lead vertically tapered, for spacing the impression surface of said type bar, not connected to said sector and having ears engaging the shoulder thereof whereby the type bar is frictionally held in the impression sector and the lead is positively prevented from protruding beyond said type bar.

4. In a printing press, the combination with an impression sector revolubly mounted, a type bar having an impression surface and a longitudinal shoulder and a clamping means on said sector for frictionally holding the type bar therein, of a lead for spacing the impression surface of said type bar and being vertically tapered and shorter than said type bar, and having-ears engaging the shoulder thereof whereby the type bar is frictionally held in the impression sector and the lead is positively prevented from pro-' truding beyond said type bar.

5. As a new article of manufacture, a lead for spacing type bars being no longer than said type bar and vertically tapered, and having a plurality of laterally projecting cars which are longitudinally spaced along the upper and wider edge of said lead and which have type bar abutting surfaces substantially parallel to the upper edge of said lead.

6. As a new article of manufacture, a lead for spacing type bars being shorter than said type bar and vertically tapered, and having a plurality of laterally projecting ears which are spaced longitudinally along the upper and wider edge of said lead and which have type bar abutting surfaces substantially parallel to and in the plane of the upper edge of said lead.

7. As a new article of manufacture, a lead for spacing type bars being vertically tapered and having a plurality of laterally projecting ears spaced longitudinally along said lead and each provided with a surface adapted to engage from beneath only a suitable customary surface on the type bar. 7

HOWARD A. KITTLE.