US1048681A - Bed-movement for printing-presses. - Google Patents

Description

H. B. GOLDBERG. BED MOVEMENT FOR PRINTING PRESSES.

APPLICATION FILED JUNE 12, 1911.

1,048,681. Patented Dec.3 1,1912.

2 SHEETSSHEET 1.

QIIQ) HIHI MT i & lu w'iimlij H. E. GOLDBERG. BED MOVEMENT FOR PRINTING PRESSES.

APPLICATION FILED JUNB12,1911.

Patented Dec. 31, 1912.

2 SHEETS-SHEET 2.

UNTTEED STATES PATENT carton.

HYTKAII E. GOLDBERG, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE MIEHLE PRINTING PRESS & MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BED-MOVEMENT FOR PRINTING-PRESSES.

Application filed June 12, 1911.

To all whom it may concern Be it known that I, HYMAN E. Gotnnnnc, a citizen of the United States, residing at Chicago, in the county of Cook and State of lllinois,.have invented certain new and useful Improvements in Bed-Movements for Printing-Presses, of which the. :tollowing is a specification.

In printing presses of the reciprocatory bed type such bed necessarily has to be of considerable weight to withstand the strains and stresses to which it is subjected in the. printing or impression operation of the machine. Consequently, the speed at which the press can be run with the greatest economy or rather with the greatest rapidity of production depends to a considerable extent upon the manner of reversing the movement of the bed at tie ends of its travel or stroke. If presses of this type are operated at an undue or excessive speed, there is a considerable tendency for the entire machine either to shift position on its foundation or Elbe shake the building in which it is contained, and the mechanism itself is subjected to great and wearing strains.

The leading object and purpose of my 1nvention is to give the bed of a printing press of this type such a motion, particularly at the ends of its stroke, that the machine can be operated at a maximum speed without detrimental jarring or other objectionable results. I have determined that'the most satisfactory movement of the bed during its retardation, change in direction of travel, and acceleration in the opposite direction is a parabolic motion, and by this I mean that the reversal of movement of the bed is brought about at such a rate that the distance traveled over by the bed measured from the point of reversal varies directly as the square of the time of travel measured from the instant of reversal. This is called a parabolic motion, because if the time be laid out along one coordinate axis and the distance along the other coordinate axis at right angles to the first, then the curve of travel should be a parabola as is well shown in many treatises on physics. This sort of motion or movement of the bed may be brought about by a variety of different mechanisms, only one of which I have deemed it necessary to describe herein and illustrate in detail in the accompanying drawings which form a part of this speci- Specification of Letters Patent.

Patented Dec. 31, 1912.

Serial No. 632,649.

fication and to which reference should be had for a full comprehension of the invention and its atlvantagcs.

Throughout the various views of these drawings like reference characters refer to the same part, and in these drawings 1 have not attempted to illustrate the entire printing press, but have merely shown in simple form a reciprocatory bed for such a press and a mechanism for producing the desired parabolic reversing movement.

In these drawings Figure '1 is a longitudinal section through a fragment of the mechauism; and Fig. 2 is a plan view of the construction shown in Fig. 1, certain parts being broken away to more clearly show the structural features of the various elements.

By reference to these drawings it will be apparent that the printing press mechanism includes a suitable supporting frame 10 in which the sliding bed 11 is guided in its reciprotatting movement. This bed has beneath and attached to it a rack 12 disposed longitudinally of the bed, and opposite such upper rack but displaced laterally thereof is secured another rack 13, the teeth of which face those of the upper rack, as is clearly shown in Fig. 1. As is illustrated, these two racks are properly spaced apart the requisite amount by two bars or standards 14 and 15. Each end of the reciprocating bed is equipped with a member having an inner parabolic surface 16 and 1.7, re spectively, and at one side of each of said surfaces is a toothed rack or sector 18 of the same shape and form, the parabolic surfaces 16 and 17' being in register with the pitch lines of the two parabolic racks or sectors 18.

Extended transversely of the machine at its center and rotatable in a suitable bearing 19 on the main frame is a shaft 20 driven from the driving shaft 21 through the intermeshing gears 22 and 23. Slidable on the inner portion of shaft 20, but rotatable therewith because of a feather or key connection 24, I employ a gear 25 adapted to be shifted laterally to alternately operativelv engage the racks 12 and 13. In order to bring about the shifting or sliding of this gear on the shaft 20 in properly timed relation to the movement of the other parts, I provide the hub 26 of this gear with an annular groove 27 in which fits the curved fingel 28 pivoted on the upper end of a rocker face and the other as being in the form of a spiral of Archimedes, I do not wish to have it understood that the production of the parabolic reversing motion is in any way limited to the use of cams either of these styles or shapes, because the requisite motion or movement of the bed can be brought about by mechanisms which employ cams of neither of these forms, but such mechanisms, however, must have a parabola for the centrode of the bed and a spiral of Archimedes as the centrode of the driving means.

Of course, any other cams emplo 'ed to produce the required movement would not be centrodes, and they will therefore have no pure rolling mot-ion upon each other but a combined rolling and slipping motion.

The term centrode has been employed several times in this application. It is defined in the Standard Dictionary as a locus .traced out by the successive positions of the instantaneous centers of pure rotation. But it is well established in many standard treatises on physics that Where any two bodies, a driving body and a driven body, have any movement relative to each other, no matter how complicated that relative movement may be, there may be determined two curves, one imagine-d to be rigidly fas tened to the driver end and the other'to the driven body.- These curves are the cen; trddes as defined in the Standard Dictionary. Moreover during the relative motion of the driving and driven bodies these two centrcdes are the only pair of curves which have pure rolling motion on each other. Among the myriad possible pairs there is not one other pair whose motion would be pure rolling. It would invariably be rolling and slipping combined.

Inasmuch, therefore, as various changes may be made in the structural features of the machine described in this application without departing from the substance of the invention, I do not wish to have the appended claims interpreted as being limited and restricted to the precise and exact structural features shown and described.

What I claim is:

1. In a bed movement, the combination of a reciprocatory bed, and -means to reverse the movement of the bed at a rate in which the distance traveled over by the bed measured from the point of reversal varies directly as the square of the time of travel measured from the instant of reversal, substantially as described.

2. In a bed movement, the combination of a reciprocatory bed having a parabolic surface, a spiral of Archimedes cam rolling thereon to give the bed a. parabolic movement, and means to rotate said cam uniformly, substantially as described.

3. In a bed movement, the combination of a reciprocatory bed having a parabolic surface, a spiral of Archimedes cam rolling thereon to give the bed a parabolic movement, means to rotate said cam uniformly, and means havingsaid parabolic surface and spiral of Archimedes as centrodes and adapted .to prevent relative displacement between said surface and spiral except said rolling movement, substantially as described.

4. In a bed movement, the combination of a reciprocatory bed, and uniformly-rotating driving means for reversing the travel of said bed, the centrodes of said bed and means being a parabola for the bed and spiral of Archimedes for the driving means, substantially as described.

5. In a bed movement, the combination with a reciprocatory bed, and a constantdri'vingmeans therefor, of a speed changing and driving connection between the driving means and the bed to vary the speed of the latter approachingand leaving the point of reversal at the extremes of its path whereby the distance traveled measured from the point of reversal is varied directly as the square of the time of travel measured from the same point, substantially as described.

6. In a bed movement, the combination of a rcciprocatory bed having a toothed parabolic surface, a toothed spiral of Archimedes cam meshing therewith to give the bed a parabolic movement, and constant driving means for the cam, substantially as described.

HYMAN E. GOLDBERG. Witnesses:

IIENRY M. I'IUXLEY, L. E. HANNEN.

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