US1605645A - Device for equalizing printing impressions - Google Patents

Description

NGV. 2 1 c. cHlsHoLM -navrcs ron aquAmzniG PRINTING Iurnassrons Filed April 27. 1925 2 sheets-sheer 1 @j 76.@ MMI.; fun'uf vzw-.fl

Nov. 2,1926. 1,605,645

C. CHISHOLM vavrcn Fon EQUALIZING PRINTING ruvnsssrous Filed April 27. 1925 2 sneetefshen 2 I Z auvent Q7' 76m: {fdr-20% @Ronny Patented Nov. 2, 1926.

UNITED NSTATES f imams PATENT oEFlcE.

CLIFTON CHISHOLM, OF CLEVELAND, OHIO, ASSIGNOR TO THE AMERICAN MULTI- GRAPH COMPANY, 0F CLEVELAND, OHIO, A CORPORATION OF OHIO.

DEVICEKFOR EQUALIZING PRINTING IMPRESSIONS.

Application led April 27, 1925. Serial No. 25,976.

My prior Patent No. 1,451,204 issued April 10, 1923, to the American Multigraph Company shows a printing form adapted for mounting on a rotary drum and comA prising a sheet metal plate having upstanding overhanging rows of projections which are surmounted by embossed printing strips having inwardly flanged edges adapted to overhang the projections. Such a flexible :torm may be readily mounted, for example, on a multigraph drum and print through an inking ribbon extending over the form. In such operation, the printi-ng lines lie parallel with the printing aXisand coact one at a time with a roller platen to impress paper between them. It results from this that very short lines, such as sometimes come at the end of a. paragraph or in the salutation, make a heavier impression than the body of the form where the lines are of approximately the same length.

The object of this invention is to provide a simple attachment adapted for mounting on this flexible blanket and serving to relieve the pressure on the short lines. To this end, I have provided a device having two parallel strips connected at one end, and separated a short distance, the understrip being adapted to rest on top of a row of projections, and having means to hold yit on the blanket and the upper strip adapted to overlie the ribbon. When the upper strip is pressed against the ribbon, during the printing impression, its outer surface stands the same heightto-the-paper as the ribbon normally stands when it engages the form.

When kmy pressure equalizer is inserted in alignment with a short line, the printing pressure at such time is taken partly at the short line and partly by the equalizer,with the result thatpractically the same support for the pressureis provided as in a line of normal length. and Vaccordingly the short lines print with the same depth of impression as the other lines.

The base member of my equalizing device may be provided with inward flanges to underhang the projections on which the strip rests or with outward flangesl to underhang the projections of adjacent rows. In either case. however, the base member rests on top of the row of projections which carries the short embossing printing strip. Each form is illustrated herein and is covered by the claims hereof.

In the drawings Fig. l is a vertical section through a multigraph machine equipped with my flexible blanket and one of my equalizers; Fig. 2 is a plan of a portion of such drum showing one ot the equalizers in place; Fig. 3 is a cross-section on the line 3 3 of Fig. 2; Fig. 4 is a perspective of the equalizer having the inward edge flanges as shown in Fig. 2; Fig. 5 is an enlarged end View of the equalizer shown in Fig. 4; Fig. 6 is an enlarged cross-section of the blanket, embossed strips and one of my inwardly flanged equalizers on a flat form; Fig. 7 is a similar cross-section showing the equalizer with the outward flanges; Fig. 8 is a perspective of the equalizer with outward flanges; Fig. 9 is a cross-section through a portion of a railed segment usual in the multigraph, equipped with my blanket and each form of equalizer.

In Figs. 2, 3, 6, 7 and `9, the numeral 10 indicates the flexible blanket, which may well be of' the form substantially shown in my patent referred to, and comprises a sheet of metal having rows ot upstanding buttons 11, which are connected at opposite edges in the line of the row with upstanding corrugations 12, the edges of the buttons at the sides of the corrugation 13 being disconnected from the body of the plate and standing some distance above it. Such form of type holder is more fully described in Patents No. 1,438,584 and No. 1,438,582, issued December 12, 1922, on applications of William J. Demming and Burnie J. Craig respectively.

Mounted on the rows of buttons are embossed printing strips 20, each made of sheet metal and having upstanding projecting printing characters, and having inwardly extending edge flanges which extend beneath the overhanging buttons, and there* by hold the strip in place.v A holder having projections with such strips mounted thereon is covered in my Patent No. 1,438,- 580 issued December 12, 1922. Such strip may be produced in any suitable machine, as for'eXample that illustrated in my application No. 535,311, filed February 9, 1922, which also claims the strip per se.

Referring now to Figs. 1 to 6 inclusive, my equalizer is shown as comprising a lower or base strip y30 having inwardly flanged edges 31, and an upper or pressure strip 32 tying; a short distance above the strip 3G,

and connected with it at one end. To effect the connection, I prefer to mount a filler block 33 beneath the body of the base strip 3() adjacent one end; to offset downwardly the end portion of 'the pressure strip 32 as at 34, and to extend two rivets through the top strip. the bottom strip and the tiiler block. These rivets may be counter sunk in the filler block and the top `strip.

The base strip is made ot any suitable metal oi suiiicient stiffness to hold its shape, while the top strip is of a spring steel and has a tendency to spring slightly Vaway from the bottom strip.

In use, the equalizer is slipped endwise over the row of buttons which carry the short lines desired to be equalized, the joined end of the equalizer being beyond the blanket. The ribbon, designated A, is then passed over the body of the 'torni but beneath the top strip of the equalizer. in this position the top surface of the equalizer is inthe same plane with the top of the rib-l bon where it overlies the short line, as clearly illustrated in Fig, 3. Accordingly, whenever the printing pressure comes on this line, the pressure is substantially the same as if it were of full length.

By making the top strip of steel, it does not .bind the ribbon, except at the instant ot impression, and accordingly the ibbon is tree to be periodically fed during the rotating of the machine. As is usual in the multigraph, such feed taking place at a time when the form is out ot coaction with the platen. i

In the form of equalizers shown in Figs. 7 and 8, the top strip 32 is identical with that just described, but the base strip 36 instead of having its langes extending diagonally inward, has downward, slightly daring portions 87 at the bottoms oi which are outward iia-nges 38. The two flanges 3.8 are adapted to underlie the projections of adjacent rows of buttons instead of the projections on which the body of strip rests. The top strip is riveted to the body ot the bot-tom strip as at 3.5 by rivets which pass through these two strips and through a reinforcing block. This reinforcing block is shown at 89V in Fig. 8 when the sides 3T and the flanges 38 are shown as cut away at this ,end to allow a wider filler block.

In the form of equalizer just described, the base strip may be readily manufactured by a single operation oit stamping, but it has a disadvantage that it is not applicable to single space work on the blanket, but requires vacant rows oi buttonslon opposite sides of the row carrying the short line.

It will be seen that my equalizing device, madein either form shown, is adapted tot ready use with the flexible blanket mounted on its support without any change whatever in either the support, the blanket or the embossed strips. Such equipped blanket may -be mounted -on a smooth drum shown at i0 in Fig. l; on a plate as shown at 4l in Figs. 6 and 7, or on rails 42 ot a multigraph .drum as shown in Fig.

Fig. 1 illustrates a machine similar to inultig'aph having a segment 40 clamped on a skeleton rotary driving shaft 4.15, and a pair ot ribs bon spools i6 mounted within the drum to carry the ends ot the ribbon. The form covered by the ribbon coactsl with the rul ber faced roller platen at?. A suitable mechanism not shown may `feed this ribbon periodically by rotating one spool or the other. For a Jfurther description of such a machine, and jarticularly ot means for feeding the ribbon, reference may be made to Patent No. 997,28?, issued July l0, llll, to the American Multigraph Company.

Having thus described my invention, i claim:

l. The combination ot a type hoider liavi* ing rows ol overhanging projections, embossed printing strips mounted on the projections ot' the diilierent rows and havingl inwardly projecting edge flanges to extend beneath said projections, and an equalizing device 'for shortlines comprising a body adapted to rest on top of a row oi:l projections and provided with means Jfor holding it in place thereon, and a strip parallel with the body and a short distance above it, connected with it beyond the edge o' the type form, said upper member adapted to overlie a ribbon which passes over the type form and over the body of said device.

2. The combination oi' a holder having projections, embossed printing strips resting1 on such projections and having inward edge flanges extending beneath them, an equalizing device comprising a base member adapted to rest on top of a projection and having edge flanges for holding it in place, and a top member secured at one end to the base member and adapted to overlie a ribbon.

3. The combination of a type holder having raised portions, embossed printing strips mounted on the raised portions, and an equalizing device for short lines comprising a Abody adapted to reston a raised portion and provided with means for holding it in place thereon, and a strip parallel with the body a short distance above it and connected with it beyond the edge form, the combined thickness of the body and top strip being equal to the thickness of an embossed strip plus the height ot the printing characters above the body ot such embossed strip.

li. The combination of a type holder hav ing overhanging projections, embossed drum la mounted on a 'l Uli) llt)

imi

lll

printing strips mounted on the projections and having inwardly projecting edge anges to extend beneath said projections, and an equalizing device for short lines comprising body adapted to rest on a projection and provided with edge flanges :tor holding it in place thereon, and a strip parallel with the body a short distance above it and connected with it beyond the edge o'l' the type form, said top strip being of spring material to enable it to automatically relieve pressure on the ribbon when it is out of printing coaction.

5. The combination of a printing couple adapted to have rolling coaction, a remov able type holder mounted on one memberof the type couple and having upstanding projections arranged in rows, embossed printing strips mounted on said projections, an inking ribbon adapted to be extended across such strips, and a pressure equalizer mounted on a row of projections in alignment with a short strip and having a top strip adapted to overlie the ribbon, said top strip standing at the same height-topaper as the ribbon over the short strip.

l 6. An equalizing device of the character described. comprising a body strip having flanged edges, and a top strip some distance above the body strip and connected to it at one end.

7. An equalizing device of the character described combining a body strip equipped with means for holding it in place and the top strip some distance above the body strip and made of spring material and connected at one end to the body strip.

8. In a device of the character described, comprising a base strip having flanged edges, a spring metal top strip having a downwardly offset portion at one end, and means for connecting said odset portion with the end portion of the base strip.

9. In a device of the character described, the combination of a base strip having flanged edges, a top strip some distance above the base strip for the greater portion of its length, the top strip and base strip being in engagement adjacent the end, and rivets passing through such engaging portions.

10. An equalizing device of the character described comprising a base strip having inwardly flanged edges, and a top strip some distance above the base strip and connected to it at one end.

1l. In a device of the character described, the combination oi' a base strip having inwardly flanged edges, a top strip of spring steel some distance above the base strip for the greater portion of its length, the top strip being downwardly offset adjacent the end, and rivets passing through suchend portion to connect the two strips together.

In testimony whereof, I hereunto affix my signature.

cLrrropN cHisHoLM.

Images