US912724A

US912724A - Printing-press.

Info

Publication number: US912724A
Application number: US25123605A
Authority: US
Inventors: George E Pancoast
Original assignee: AMERICAN LITHOGRAPHIC CO
Current assignee: AMERICAN LITHOGRAPHIC CO
Priority date: 1905-03-21
Filing date: 1905-03-21
Publication date: 1909-02-16
Anticipated expiration: 1926-02-16

Description

G. E. PANCO AST. PRINTING PRESS.

APPLICATION FILED MAR. 21, 1905.

Patented Feb. 16, 1909.

6; Z 1 ATTORN Y6.

UNITED sTA'rEs ra rnrorurci GEORGE E. PANCOAST, OF BROOKLYN, NEW YORK, ASSIGNOR 'lO AMERICAN LITHOGRAPHIU COMPANY, A CORPORATION OF NEW YORK.

PRINTING-FIRE SS.

Specification of Letters Patent.

Patented Feb. 16, 1909.

Application filed. March 21, 1905. Serial No. 251,286.

To all whom it may concern:

which the followin is a specification.

j cylinder is formed by two sections 3 and 4:,

Be it known that I, GEORGE E. PANCOAST, f acitizen of the United States, and a resident of Brooklyn, Kings county, State of 1 New York, have invented certain new and useful Improvements in Printing-Presses, of 5 1 parts of the cylinder so that it may be moved .My invention re ates to printing presses, i and more particularly to devices for securing theimpression or design surfaces in placeupon the printing members thereof.

An 0 oel: of my invention 1S to provide a construction whereby flexible or limber impression surfaces or blankets or other similar members may be evenly and forcibly strained or stretched into position and held on the impression or other members of printin presses.

y invention also contemplatesa construction whereby flexible surfaces may be efiiciently strained upon cylindrical or similar 'supportin surfaces and without leaving an ob ectiona le gap or recess therein.

These and other objects of my invention will more fully appear from the following description.

Having in view these and other objects, which W111 more fully appear from the following description or will be obvious therefrom, my invention consists in the novel devices, combinations of devices, and improvements herein set forth.

The accompanying drawings, which are referred to herein and form a part hereof, show'by way of example one embodiment of my invention as applied to the impression member of a printing press, which embodiment in connection with the description herein will serve to explain the principles of'my invention.

Referring to the drawings, Figure 1 is a side elevation of an impression member constructed in accordance with my invention; Fig. 2- is a transverse section of the same taken on the line 2, 2 of Fig. 1; Fig. 3 is an end elevation illustrating certain details; Fig. 4 is a broken sectional view similar to that of Fig. 2 but illustrating the parts in different relative positions.

Referring in detail to the particular em bodimentof the invention illustrated in the drawings, 1 represents an impression member having a cylindrical supporting surface. The operative supporting surface of the which are movable with relation to each other. The section 3 is preferably fixed or immovable with relation to the axis of the cylinder. The section 4 is movably mounted with relation to the section 3 and the other into and out of operative position to enable the ends of a separate flexible member, as the blanket 5, which is to be strained upon and held by the supporting surface, to be secured in place.

The movable section 4 is so mounted that when itis moved into operative position the flexible member will be brought uniformly and forcibly into proper position upon the supporting surface of said cylinder. T his may be done-1n various Ways, many of which will be obvious when the principle involved is clearly understood. In the form of the device shown, the supporting member at is so mounted that it may be moved outwardly with relation to the axis of the cylinder and in such direction as to shorten the distance between the points at which the flexible member is secured.

As shown in the drawings, the flexible member 5 is in the form of an impression blanket. This blanket may besecured at its opposite edges to the cylinder in any suitable Way. As shown, it is permanently secured to the section 3 along one edge by means of a series of hooks 6 projecting inwardly adjacent to the edge of the section 3. At its opposite edge the blanket 5 is secured by means of a series of hooks to a shaft 7 mounted along one edge of the movable section -l. To enable the shaft 7 to be rotated so as to draw the blanket around the im ression cylinder, said shaft is squared at its ends and is provided with flanges 8, through suitable perforations of which may be passed one or more holding screws 9. Any other suitable device may be employed for operating and holding the shaft 7.

As shown, the cylinder 1 is provided with a recess or seat adapted to rcceiue the section 4 so that when said section is in place upon said seat, its supporting surface will be substantially continuous with the surface of the section 3 and form a part of the op erativc supporting surface of the cylinder. To permit the section 4 to be moved in the manner and for the purpose described, it is hinged. or pivotally mounted along one edge,

referably on an axis parallel with and ad- ]acent' to thesurface of the support, so that 11: may be moved outwardly from the posltion shown in Fig. 2 to a position as indi cated in Fi 4.

'Preferab y, the edge of the section 4 is squared so as to give an approximately radial direction to the adjacent surfaces of the sections 3 and 4, and the pivotal connection between the sections 3 and 4 is formed by pins 10 projectin from the opposite ends of the section 4 an engaging suitable slotted recesses in brackets or lugs 11 fixed to'the ends of the cylinder, as shown in Fig. 3.

f For the purpose. ofsecurely retaining the section 4 firmly upon its seat it is preferably provided with one or more lug brackets 12 aving a downwardly and rearwardly inclined surface adapted to engage a correspondingly inclined shoulder formed in the cylinder adjacent to the contacting edge of the section 3.

So far as some of the features of my invention are concerned, any suitable means may be provided for moving the section 4 into or out of its operative position for the purpose of stretching the flexible member and releasing it. Preferably, and in accordance with one feature of the invention, means are provided for forcibly drawing the section 4 inwardly from the position shown in Fig. 4 to its operative position shown in Fig. 2 so that by this movement the flexible member may be strained or stretched .around the cylinder with great force. As shown, the section 4 is provided at each end with a pivot block 13 in which is journaled a screw 14 having-a squared head adapted to be engaged by a suitable wrench. This screw is threaded into a pivot block 15 suitably connected with the end of the impression cylinder.

The construction shown may be operated as follows: The movable section 4 having been thrown outwardly, as shown in Fig. 4, the opposite ends of the flexible member are secure in place upon the hooks. The shaft 7 is then turned so as to draw the flexible member with a suitable degree of force around the supporting cylinder. Then by means of the screws 14 the section 4 is firmly drawn down upon its seat in the cylinder to and with what force the shaft 7 was opflexible member may be rought as close together as desired so as to leave little or no gap in the operative surface thereof and at the same time ample space is provided for readily securing the edges of the flexible member in place. Other advantages of the construction will be apparent to those skilled in the art.

My invention in its broadest aspects is not limited to the particular construction shown and described nor to any particular construction by which it has been or may be carried into effect, as many changes may be made therein without departing from the main principles of the invention and Without sacrificing its chief advantages.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A printing press including in combination, a support having a movable member which when in normal position is continuous with and forms apart of the operative surface of the support, said movable member being so constructed that when moved out of operative position, a flexible member may be fastened in place and when moved into operative position the flexible member will be brought into position upon the support,

and mechanism for forcing said movable member into operative position.

2. A printing press including in combination, a support having a movable member which when in normal position is continuous with and forms a part of the operative surface of the support, a flexible member, means for fastening said flexible member, said movable member being so constructed that-when moved out of operative position the flexible member may be fastened and when moved into operative position the flexible member will be brought into position upon the support, and mechanism for forcing said movable member into operative position.

3.. A printing press includmg in combination, a support having a member movable transversely to the operative surface of the support, said member while in normalposition being continuous with and forming a part of the operative surface of said support, a flexible member, means for fastening said flexible member, saidmovable member being so construeted that when moved out of operative position the flexible member may be fastened and when moved into operative position the flexible member will be brought into osition upon the support, and mechanism or forcing said movable member into operative positlon.

4. A printing press including in combination, a su port havinga member movable transverse y to the operative surface of the support, said member while in'normal positionbeing continuous with and forming a part of the operative surface of said support, a flexible member, means for fastening one for fastening the flexible member to saidmovable member, said movable member being mounted to move transversely to the operative surface ofthe support, and mechanism for forcing said movable member into operative position.

6, A printing press including in combination, a support havlng a movable member which when in normal position is continuous face of the support, a flexible member, mechanism for forcing the movable member into operative osition, and means for fastening said flexib e member to said movable mem her, said movable member being so mounted that it may be moved transversely to the operative surface of the support.

8. A printing-press includin in combinationfa sup ort having a mem er pivotally mounted a jacent to the operative surface of the su port, said member while in normal position eing continuous with and forming a part of the operative surface of said support, means for fastening a flexible member to said movable member at a point remotefrom said pivot, and mechanism for forcing the said movable member Into 0 erative position transversely to the operative surface of said support.

j 9. A printing press including in combination, a su' port having a movable member hin ed ad acent to the operative surface of saic sup ort. said member while in normal position eing continuous wlth and forming a part of said 0 erative surface, means for fastening a flexi 1e member to said movable member'at a point remote from the hingethereof, and mechanism for forcing said movable member into operative position transversely to the operative surface thereof.

10. A printing press including in combination, "a support having a cylindrical operative surface and a movable member of operative which when in normal position is continuous with and formsa part of said surface, said movable member being so constructed that when moved out of operative position a flexible member may be secured thereto and when moved into operative position the flexible member will be brought into position upon the support, and mechanism for forcing said movable member into operative position.

11. A printing press including in combination, a support having a cylindrical supporting surface and a movable member which when in normal position is continuous with and forms a part of said surface, a flexible member, means for fastening said flex ble member, said movable member being so constructed that when moved out of operative position the flexible member may be fastened and when moved into operative position the flexible member will be brought into position upon the support, and mechanism for forcing said movablemember into operative position.

12. A printing press including in combination, a support having a cylindrical surface and a movable member which when in normal position is continuous with and forms a part of said surface, means for securing a flexible member to said movable member, and mechanism for forcing said movable member into operative position.

13. A printing press including in combination, asupport havin a cylindrical sur* face and a movable mem er which when in normal position is continuous with and forms a part of said surface, means for securing a flexible member to said movable member, and mechanism for forcing said movable member into operative position, said movable member being 11in ed to said support at a point remote. from t e securing means thereon whereby when said movable member is brought into 0 erative position the flexible member will be strained into position upon said support.

14. A printing press including in combination, a support having-a cylindrical surface and a movable member hinged on an axis parallel with and so located with reference to said surface that said member moves transversely to saidsurface, means for securinga flexible member to said movable member, and mechanism for forcing said movable member into operative position whereby when said movable member is out.

osition a flexible member may be secured liereto and when moved into operative position the flexible member will be strained into position upon said support.

15. A' printing press including in com- .bination,ja. support having a movable member formmg a part of its operative surface,

a flexible member, means for fastening the flexible member to said sup ort and said movable member, said movab e member be ing mounted to move in such relation to the name to this specification, in the presence of support that the strain on the flexible memtwo subscribing Witnesses.

her will be increased as the movable member 1 approaches its normal position, and-mechan- GEORGE PANCOAST' 5 ism for forcing said movable member into Vitnesses:

operative positlon. W. l3 TEN EYCK,

In testimony whereof, I have signed my JACOB MILLER.