US1662284A - Blanket holder for printing cylinders - Google Patents

Description

March 13, 1928. 1,662,284

F. B. SHEA BLANKET HOLDER FOR PRINTING CYLINDERS 1! Filed March 17. 1927 J (P/tank 53.5%

IN V EN TOR.

flu ATTORNEY Patented Mar. 13, 1928.

UNITED STATES 1,562,284 P TENT ()FFIEE,

FRANK B. SHEA, 01F BROOKLYN, NEW YORK.

BLANKET HOLDER: FOR PRINTING CYLINDERS.

Application filed March 17, 1927. Serial No. 175,951.

My invention relates to blanket holders for printing, cylinders and has for its object to provide a holder which will subtract a. very small area from the printing surface of the cylinder and at the same time provlde a simple, efficient and readily accessible securmg means.

As is well known, certain cylinders of printing presses are covered with blankets which must be stretched tightly about the surfacev of. the cylinder; Heretofore the means for securinga blanket, to a cylinder have taken up an excessive area of the cylinder, surface. This area represents a total loss of printing surface and results in the wide blank spaces on the printed sheet. In the case of' a. large web press with its many impression cylinders and through.

which large quantities of paper are passed, the space lost by the holding means amounts to a. large total which adds materially to the expense of the output.

Heretofore in order: to reduce this space to a minimum accessibility of the holding means has had to be sacrificed. It is an object of my invention to provide a. holding means which will reduce waste space on the cylinder without sacrificing accessibillty.

Another object of my invention is to pro vide a blanket holder which maybe readily applied toor removed from acylinder.

\Vith these and otherobjects in view which will appear hereinafter I shall now describe a preferred embodiment of my invention. and point out the novelty and scope my invention inthe appended claims.

In the accompanying, drawing, Figure 1. is a view in cross-section of aprinting cylinder provided, with my improved blanket, holder, the section being taken on a line 1-l of Fig. 3.

Fig; 2 is a view in. section similar to Fig. 1, but showing my improved holder in a different-position; and

Fig. Sis aside view of aprinting cylinder partly broken away along the line 33 of Fig. 1 to illustrate my improved blanket holder in. side elevation.

In the accompanying drawings 1 have used the reference numeral '10;to designate a printing cylinder. A notch 11 iscut in the face of thecylinder parallel. to the cylinder axis. (Dne Wall 12, of the notch is preferablyradial to the cylinder.. Bearing against the wall 12 is a plate 13 which is held in place by means of headed pins 14;. The

latter pass through slots 15 inthe plate 13. if desired the pins 1d may bethreaded' into the wall 12, but I'prefer to attach them to a. rail 16 wl' ich is seated in an undercut longitudinal slot 17 formed in the wall 12. The slot a 1d the railv are preferably of dove-tail in cross section, so that the rail will be lockedfagainst lateral movement, but may slide endwise in the slot. Theouter end of the rail 16 carries a lug 18 through which a screw 1%) is passed and threaded into the cylinder, thereby locking the rail and'the pins it carries to the cylinder. I

Secured to the plate 13 at suitable intervals by means of straps 20 are springs 21; These springs are preferably ofrectangular cross-section so that theywillnot turn in the straps 20. The springs are ofinverted li shape with the free ends curved outwardly and forming feet 22 which engage a slot in the bottom of the notch 11. 5 The springs 21 tend to hold the plate 13 in the raised position shown in Figures 1' and 3, and in this position the pins lat engage the bottoms of thesl'ots 15. When the plate 13' is in a raised position it projects from theperipheral face of the cylinder sothat hooks 2e, projecting from the exposed face of the plate 1'3, are readily accessible. A blanket 25 is coiled abouta roller 26 lying within the notch 11 and passes around the cylinder 10 with its free end engaging the pins 24. It will be observed that the slots 15' are of bayonet form comprising in each case a vertical portion terminatingat the outer endin a lateral offset 27. The offsets 27 are rounded at the bottom to provide seats for the pins 14- and at the juncture of these rounded bottoms withthe vertical portions of the slots there are slightly raised points or slioulders 28. depressed so that its outer edge lies slightly below the peripheral face of the cylinder 10 the plate may be moved laterally to permit the pinsto enter the offsets 27. Then on releasing the'plate the springsiZl will raise the plate, so that its outer edge lies flush with the peripheral face of the cylinder, and the shoulders QS W lllllOld the pins in the o'll'sets 27 preventing endwise movement of the plate. a e

At one end of the plate 13 there is a pro- 'jection or car 29 which is preferably rounded at the lower edge thereof. I Mounted'on the wall 12 is a spring 30 which is downwardly curved in the path of the projection 29.

Thus when the plate 13 is Thus, when the plate 13 is depressed the rounded edge of the car 29 engages the spring 230 and the latter presses the plate 13 cndwisc, so that as soon as the pins it clear the shoulders 2d the plate 13 will be auto matically moved endwise, permitting the pins to enter the otlsets QTand loclr the plate in depressed position.

In practice whenever it is desired to attach or detach a blanket l'rom the cylinder the plate 13 is slightly depressed and moved endwise against. the tension of spring 30 to permit the pins 12 to clear the oli'sets 2T, whereupon the springs 21 will force the plate l3 outward to the position shown in Figures 1 and The end of a blanket may then be attached to or detached from the hooks which now are in a position oi? ready accessibility. After a blanket has been attached to the plate and the plate is forced down into the notch 11 the spring no will automatically push it endwise in position to be locked by engagement ol the pins it with the Ollsets 2T. 'lfhercalter the take-up roller 26 is turned to take up any :ilttt'li in the blanket. The construction oi the talte up roller forms no part oli my invention and may be of any WQlll-IllOWIl form.

It: will be observed that by my invention the holding plate l3 is disposed radially with respect to the cylimler and thus occupies aminimum space. Hence the width ol the slot ll may be such that the pins ill on the plate will jtnt clear the blanket wound up on the talte-up roller ll hile l have illustrated and described a preferred embodiment ot my invention, 1 consider myself at liberty to main: such changes .in construction, form and arrange ment. oi' various parts as fall within the delinition ol' the 'l'ollowing claims:

l claim:

l. in combination with a printing cylinder having an axially disposed notch formed in the periphery lhcreo'l, attaching means within the notch to which one end ot a. hlanlrct may be secured, means in the notch by which the opposite end ol the blanket may be drawn taut, said attaching means being mounted to slide substantially radially without the notch, and means for locking said attaching means in depressed position.

2. ln coinbihation with a printing cylinder having an axially disposed notch formed in the periphery thereof, a blanket holder comprising a plate mounted to slide inwardly and outwardly in the notch, attaching means carried by the plate, a spring tending to force the plate outward, whereby the attaching means will project beyond the peripheral face of the cylinder, and means for locking the plate in depressed positionln combination with a printing cylinder l'lavine an axially disposed notch formed in the periphery thereof, a blanket holder coniprising a plate mounted to slide radially in the notch, hooh's carried by the plate, a spring tending to lorce the plate outward. whereby the hoolis will project beyond the peripheral lace ol' the cylinder, and mean; for locking the plate in deprrsscd position.

l. in combination with a printing cylinder harng an axially disposed notch .lormcd in the periphery thereof, a plate mounted to slide radially in the notch, hoolo; carried by the plate and adapted to engage one end of a blanliet, a spring tending to lorre the plate outward, whereby the books will projci-t beyond the peripheral l'arc oi the cylinder, means for locking the plate in deprcswd position and a tahwur roller in the notch about whicl the opposlle end ol the blanlnt may be wound.

5. In combination, a printing cylinder formed with an axilly disposed notch in the periphery thereof, the notch having a substantially radial wall, a plate, hooks carried by the plate. means For holding said plate in radially slidable engagement with said wall, a. spring tending to force the plate ontward to a position in which the hooks will project beyond the peripheral l'ace ol the cylinder, and means for locking the plate in deprcsstnl position. i

6. In combination, a printing cylinder formed with an axially disposed notch in th periphery thereof, the notch having a Jilin stantially radial wall. a plate. l'orm d with bayonet slots, headed pins engaging the ,lUlc: respectively and securing the plate in radially slidable engagement with said wall, hooks carried by the plate, a spring lend ing to slide the plate outward to a position in which the books will project beyond the peripheral face of the cylinder, and means tending to press the plate endwisc when the plate is depressed, whereby the pins will enter the oll'set portions of the bayonet slots and lock the plate in depreseed position.

7. In combination, a printing cylinder formed with an axially disposed notch in the periphery thereof, the notch having a substantially radial wall, a plate formed with bayonet slots, headed pins engaging the slots respectively and securing the plate in radially slidalole engagement with said wall. hooks carried by the plate. the bottom of the notch being formed with a groove, a V shaped spring, means for securing the spring to the plate, the free ends of the spring engaging the groore and tending to slide the plate outward to a position in which the hooks will project from the peripheral tare of the cylinder, and another spring tcudinp to press the plate endwisc when the latter is depressed, whereby the pins will enter the offsets of the bayonet slots and lock the Plilll in depressed position.

8.111 combination. a printing-r cylinder formed with an axially disposed notch in lllfi the periphery thereof, the notch having a substantially radial wall, a plate formed with slots, headed pins engaging the slots respectively and securing the plate in radially slidable engagement with said wall, hooks carried by the plate, a spring tending to slide the plate outward to a position in which the hooks will project beyond the peripheral face of the cylinder, each of said slots having a radial portion and a lateral offset at the outer end of the radial portion and an outwardly projecting shoulder at the junction of the radial portion and the offset, and means for causing the plate tomove endwise when it is depressed, whereby the pins will enter said offsets, holding the plate in depressed position and the shoulders will lock the plate against endwise movement.

9. In combination, a printing cylinder formed with an axially disposed notch in the periphery thereof, a plate formed with bayonet slots, headed pins engaging the slots respectively and securing the plate in slidable engagement with one of the side walls of said notch, hooks carried by the plate, a spring tending to slide the plate outward to a position in which the hooks will project beyond the peripheral face of the cylinder, the plate being formed at one end with a projecting ear, and another spring mounted in the notch in the path of said ear, whereby when the plate is depressed the latter spring will engage the ear, tending to move the plate endwise so that the pins will enter the offset portions of the bayonet slots and lock the plate in depressed position.

10. In combination, a printing cylinder formed with an axially disposed notch in the periphery thereof, the notch having a substantially radial wall, a plate formed with bayonet slots, headed pins engaging the slots respectively and securing the plate in radially slidable engagement with said wall, hooks carried by the plate and adapted to engage one end of a blanket, a take-up roller in the notch about which the other end of the blanket is adapted to be wound, a spring tending to slide the plate outward to a posioffset portions of the bayonet slots and lock the plate in depressed position.

11. In combination, a printing cylinder formed with an axiallly disposed notch in the periphery thereof and with an undercut groove in one of the side walls of the notch, a rail slidable endwise in the groove, means for securing the rail in fixed position in the groove, a plate formed with bayonet slots, headed pins engaging the slots respectively and securing the plate in slidable engagement with the rail, hooks carried by the plate, a spring urging the plate outwardly to a position in which the hooks will project from the peripheral face of the cylinder, and means for caus'ingthe plate to move endwise when it is depressed whereby the pins will enter the offset portions of the bayonet slots and hold the plate in depressed position.

In witness whereof, I hereby afiix my signature this 16th day of March, 1927.

FRANK B. SHEA.

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