US754253A - Means for attaching blankets to cylinders of printing-presses. - Google Patents

Description

PATENTED MAR. 8, 1904.

:A. B. STEWART. MEANS FOR ATTAGHING BLANKETS TO- CYLINDERS OF PRINTHLGPRESSES.

APPLICATION FILED JUNE 29. 1901.

H0 MODEL.

Af/omey UNITED STATES PATENT OFF CE.

ANDREW BARCLAY, S EWARTQOF' BROOKLYN, NEW YO K.

MEANS FOR ATTACH-lNG BLANKETS T CYLINDERS 0F PliINTlNG-PRESSESt SPECIFICATION forming part of Letters Patent No. 754,253, dated March 8, 1e04,

Application filed June 29, 1901.

To all whom, it may concern.-

Be it known that], ANDR n'w BARCLAY STEW- ART, a citizen of the United States, residing in Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Means for Attaching Blankets to Cylinders of Printing-Presses; and

, Ido declare the following to be a full, clear, and i vide means which will admit of the ready attachment and detachment of the blanket without the loss of valuable time and without the necessity of an entire removal of the fasten ing means or parts thereof in the operation of attaching or detaching the blanket to or from the impression-body of the press.

To the accomplishment of the foregoing and such other objects as may hereinafter appear,

the invention consists in the construction and in the combination. of parts hereinafter particularly described and then sought to be clearly defined by the claims, reference being had to the accompanying drawings, forming a part hereof, and in which Figure 1 is an end view of the impressioncylinder of a printing-press having applied thereto the type of blanket for which my fastening means is particularly'well adapted.

' its unlocked position.

Fig. 2 is a front elevation of an impressioncylinder with a portion broken away, showing the blanket applied to a segment of the-cylin der. Fig. 3 is a front view of the flange portion of the metallic face-plate of the blanket, showing the manner of, forming slots in the flange to reeeivethe eccentric-headed clamping-screw, the head of the screw appearing in Fig. 4 is a similar view showing the eccentric headed screw in its clamping position, and Fig. 5 is a detail sectional View through one segment of the imprcssion-cylinder with portions broken away SerialNo. 6f S.466.- (N0 modelf I hand the parts illustratedon an enlarged scale or full size to clearlyillustrate the fastening means. I

In the drawings the numeral 1 designates a printing press impression cylinder having two segmental impression-surfaces 2 of ordinary construction and showing applied to one of the segments a blanket consisting of an elastic bod y 3 and a flexible metallic face-plate general of ordinary construction and at present in practical use. Vlith the parts so constructed it was the practice prior to my invention to secure the flanged end of the blanket to the cylinder by means of screws passed through the flange of the blanket and into the edge of the cylinder, with the heads of the screws fitting into countersunk portions of the flange. The objection to that method of fastening the flanged end of the blanketto the cylinder is that when it is necessary to add additional packing or elastic body underneath the metal face-plate it is necessary to remove all the screws in order to unfastr o the metal face-plate and permit it to be removed so as to supply the additional packing, and, furthermore, the countersunk formation'twill under some conditions prevent the blanket from being drawn down tightly at the edge of the cylinder where the flange overlaps the edge of the cylinder. These objections are serious, because time is an important factor in the adjustment and fastening of the blankets to the cylinders. have devised the construction consisting in forming eccentric or elongated slots 11, one for each screw, in the flange 5 of the blanket, and in providing screws 12, formed with eccentric heads 13, the eccentric or elongated form of theslot permitting the flange to be slipped To overcome these objections, I

. cylinder by turning the screw so as to bring its eccentric or overhanging head portion over the flange along the edge of the slot'in which the screw fits. This has the effect not merely of bringing the eccentric head in such position that the flange will not slip over the head, but also the eflect of the head drawing down onto the flange at the, same time, so as to draw it closely to the edge of the cylinder, thus securely clamping the flange to the cylinder,

while at the same time preventing it from slipping over the head of the screw. It will also be-observed that the slot is materially deeper than the thickness of the shank of the screw, which feature enables the flange portion of the blanket to be adjusted or depressed more or less, as may be necessary in order to secure a tight fit of the blanket against the surface of the. cylinder at the point where the flange occurs and when adjusted to-such position to be held or clamped in that position bythe eccentric portion of the head "bearing against the face of the flange and by the screw action clamping it to the edge of the cylinder. The advantages of these points or features will be apparent to the skilled in the art, and it will be observed that the means by which they are attained are both simple and efficient.

While I have illustrated and described the invention asapplied to an impression-cylind er, yet it will be understoodthat the invention may be used with other forms of impressionsurfaces than the cylindrical form, although it is of especial advantage when employed in connection with impression-cylinders of printing-presses.

While I have illustrated and described the preferred form of the features constituting my'invention, yet it is to be understood that changes can be made in the form of the parts and essential features, broadly consid ercd, still be retained.

Havingdescribed my invention and set forth its merits, what 1 claim is- 1. In a printing-press,the combination with the impression-body portion of the press, of a blanket formed with an opening, and a headed clamping device arranged to pass through said opening and adapted to be turned to bring its head down upon the blanket by a drawing action, the opening in the blanket being larger than the greatest diameter of the 2. In a printingpress,the combination with i the impression-body portion of the press,.of'

an eccentric-headed screw entering the said impression body portion, and a blanket formed with an opening to receive the eccentric-headed screw, said opening being eccentric to the screw and said screw adapted by rotation to have its eccentric portion brought over the blanket and to exert a screwdrawing action thereon, thereby tending to draw the blanket taut and clamp it to the impression-body portion, substantially as described.

3. In a printing-press, the combination with an impression-cylinder, of a blanket having a flange adapted to fit over-an edge of the cylinder and formed with an opening, a reel-rod having the opposite end of the blanket connected therewith, and an eccentric-headed screw passed through the opening in the flange of the blanket and entering the edge of the cylinder, the opening in the flange being eccentric to the shank of the screw, and said screw in its unclamping position permitting the flange portion of the blanket to slip over its head and in its clamping position having its eccentric head clamp the flange to the edge of the cylinder by a drawing action, thereby tending to draw the blanket taut upon the impression-body portion of the. press, substantially as described.

4. In a printi ng-press, the combination with the impression-body portion of the press, of a blanket having a flange formed with an opening, and an eccentric-headed screw entering the body-impression portion, said screw in one position adapted to have the apertured flange portion slip over its head and in another p01 sition to have the eccentric portion of the head bear against the flange and clamp it to the impression-body portion by a drawing action, thereby tending to draw the blanket taut upon the impression-body portion of the press, the opening in the flange being materially larger than the thickness of the shank of the screw to permit adjustment of the blanket, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

HENRY Sonon, Jr., JAs. E. MGKENNA.

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