US513555A - Printing-press - Google Patents

Description

(No Model.)

P. BRADY. PRINTING PRESS.

No. 513,555. Patented Jan. 30,1894.4

THE NATIONAL LlnosAPmNs ceMFANY. wAsmNaYoN. r34 c.

Miren PATRICK BRADY, OF NEW' LONDON, CONNECTICUT.

PRINTING-PRESS.

SPECIFICATION forming part of Letters Patent No. 513,555, dated January 30,1894. Application filed June 23, 1893. Serial No. 478,667. (No model.)

To a/ZZ whom it may concern.-

Be it known that I, PATRICK BRADY, a citizen of the United States, and a resident of the city and county of New London, in the State of Connecticut, have invented certain new and useful Improvements in Printing- Presses, which improvements are fully set forth and described in the following specification, reference being had to the accompanying sheet of drawings.

This invention is in the class of printing presses commonly known as cylinder presses, and said invention, as here illustrated and described, is applied to a press of the well known single cylinder type; a brief description of the construction and operation of those parts of such a press having immediate relation to my invention being as follows:- Presses of this class are provided with a dat bed, or table, which, as commonly constructed, is actuated by a system of gearing to move at an even rate of speed with the revolving cylinder, on which table rests the form which is carried forward and backward through the machine. The cylinder is provided with a prepared tympan and onto this the sheets of paper to be printed are fed. The above men'- tioned form, which has been previously inked, runs along with the sheet until it is printed, when the same is retracted to be reinked 'in order to print the next sheet of paper fed onto the cylinder. A segment ofthe cylinder is removed, or its surface depressed, to permit of this backward movement of the table and its form.

The object of this present invention is to do away with the present means employed to actuate the aforesaid bed or table and to substitute simple, and as I believe novel, mechanism therefor and also to provide simple mechanism for limiting the forward and backward movement of the table and to take the place of the air cushions now provided to check said table, so-that there may be no jar when the direction of movement of the table is changed.

To more' clearly explain my invention I have provided, for use with this specification, the accompanying drawings, in which- Figure 1 shows, in elevation, a press ein bodying my improvements and Fig. 2 illustrates a weighted lever, hereinafter described in detail, which serves to check and limit the movement of the bed or table, as also hereinafter described.

Referring to the drawings, the letter a inof the traveling bed or table e as seen in Fig.` u l. Should the bed and segment be in thel relative position shown in Fig. l, it will beA understood that, if the segment be rotated in` the direction of the arrow l, its gear teeth, meshing with rack teeth d of table c, will cause said table to travel in the direction of arrow 2 until the table reaches the position indicated by dotted lines in said figure. When the table is thus traveling forward the form, resting thereon, bears against the tympan of the cylinder and the paper fed forward on said tympan is thus brought into contact with the form and receives an impression therefrom or, in other words, is printed. When the table e has reached the position indicated in dotted lines above mentioned the teeth of the segment c, by reason of the circular movement of said segment, leave the teeth d of rack e and at the same time the depressed portion of the surface of cylinder o. is brought over the bed e thereby producing an open space between said cylinder and bed and allowing the bed to retract so that the form may be reinked in order to print the next sheet of paper carried round by the tympan. This backward movement of the bed e is accomplished in the following manner: Secured to a suitable point on the table e (here shown as its under side) is a cord or chain f which from thence leads to, and is guided by, pulleys g suitably located to insure the free rendering of said cord f over or under the same. To the free end of this cord f is secured a weight h. Should the table e be in the positionindicated by dotted lines it will be readily understood that, when the teeth of segment c and rack d are disengaged, the weight h, (being sufficiently heavy) will by means of cord f cause table e to at once IOO travel backward to its starting position, as shown in full lines in said Fig. 1.

To limit the forward and backward movements of the table e, and also to prevent any jar resulting from its change of movementin one direction to that of an opposite direction, the following device is provided: Hung about midway the length of the press, on a roekshaft lo extending from frame to frame thereof, or upon a stud suitably located in the machine, is a lever m one end of which is conneetedby chain n to a suitable point on table e, which lever m bears upon its free lower end a weight m'. When table e is caused to travel by segment c and rack d in the prescribed direction for printing, or in the opposite direction by weight h, it will be noticed that when said table has nearly completed the desired movement in either of said directions the chain n will commence to draw the upper end of lever m in the direction of movement of the table. The lever m when not actuated by chain 'n will by reason of its weighted end always maintain the vertical position shown in Fig. 2. As the chain n continues to draw said lever m from its vertical position the weight fm is slowly raised. At first this weighted end starts readily and offers very little resistance but the further it gets from its vertical position and the nearer it comes to a horizontal position the greater becomes the resistance offered by said weight, so that just before the chain n becomes taut, as seen in Fig. 1, the table e has lost its momentum; the ch-ain n being sufficiently long to permit the table e to travel the distance desired. It will also be seen that when the weighted end of lever m is near its horizontal position the direction of movement of the table is changed and said weighted lever, seeking then to gain its vertical position, will assist the table in starting backward.

Assuming new that we have a press of the described construction, properly assembled and embodying my improvements, and that the various parts mentioned are in the position shown in Fig. l, should segment c be rotated the bed e will be caused to travel by the meshing gearteeth of gear segment c and rack dto the position shown in dotted lines, but said table e would be checked and prevented from traveling farther forward (by momentum) by the'resistanee offered by the weighted lever m,

which would then be in the opposite position to that in which it is shown in said figure. During this forward movement the weight h will have been drawn upward, as shown in dotted lines. As soon as the gear teeth of segment e leave the teeth of rack d and the recessed portion of the cylinder faces the table e (thus leaving a clear space between said table and cylinder) the weight h at once commences to draw backward table e until said weight and table reach the positions shown in full lines; the table being prevented from bringing up with a jar at the completion of its movement in either direction by the resistance of the weighted lever. rlhe Weight m may be adj'ustably supported on the free arm of lever m by means of nuts m2 on each side of said weight thereby making it possible to increase or diminish the leverage. An eye m3, to which the chain n is attached, may also be adjustable in like manner to Vary the amount of power required to rock the lever.

My improvements are very simple, do away with much of the complicated mechanism used on presses as n'ow manufactured for accomplishing the same purpose, and may be cheaply produced.

Having described my invention, I claiml. In a printing press provided with a reciprocatory table, the combinatiomof a weight pivotally secured substantially midway of the frame of the press, and a flexible connection secured to the table and to the weight, the connection being of such length that the weight will not be operated thereby until the table is near the end of its movement in either direction, substantially as set forth.

2. In a printing press provided withv a 'reciprocatory table, the combination, of a lever having a weight at one end, and a exible `connection secured to the opposite end of said lever and to the table, said connection being of such length that the lever will not be operated by the connection until the table is near the end of its movement in either direction, substantially as set fort-h.

3. In a printing press provided with a reci procatory table, the combination, of a weight pivotally secured'substantially midway of the frame of the press, a fiexible connection secured to the table and to the weight, and means for changing or adjusting the length of the connection, substantially as set forth.

4.. ln a printing press provided with a reciproeatory table, the combination, of a lever having a weight at one end and having its opposite end screw-threaded, an eye adjustably secured to the screw-threaded end of the lever, and a flexible connection secured to the eye and to the table, substantially as set forth. y

PATRICK BRADY. Witnesses:

ALONZO M. LUTHER, ALLEN TENNY.

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