US618186A - Island - Google Patents

Description

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Patented 1an. 24, |899. P. M. RANDALL, 1n.

PRINTING PRESS.

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PRINTING PRESS. (Application maliv .nm 22, 189s.)

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No. 6l8,|86. Patented 1an. 24, |899. P. M. RANDALL, 1R.

PRINTING PRESS.

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lUNrTn STATI-s ATENT Prien..

PHINEAS M. RANDALL, JR., OF VESTERLY, RHODE ISLAND, ASSIGNOR OF ONE-HALF TO ABEL I. RANDALL, OF SAME PLACE.

PRINTING-PRESS.

SPECIFICATION forming part of Letters Patent No. 618,186, dated January 24, 1899.

Application tiled January 22, 1898. Serial No. 667,544. (No model.)

To cz/ZZ when@ it may concern:

Be it known that I, PHINEAS M. RANDALL, .I r., residing at Vesterly, in the county of Va-shington and State of Rhode Island, have invented certain new and useful Improvements in Printing-Presses, of which the following is a specication, reference being had therein to the accompanying drawings.

This invention relates to printing-presses.

The object of the invention is to improve the mechanism by which a reciprocating press-bed is driven and to secure accurate register between such a bed and the rotating cylinder of the press.

To this end the invention consists in certain constructions and combinations of mechanical elements, as will be hereinafter set forth.

Figure l is a broken side elevation of a bed and cylinder-press, showing the general arrangements of parts in a bed and cylinderpress. Fig. 2 is a broken side elevation of so much of the bed frame and driving-gear as is necessary to show the general features of this invention, the position of the drivinggear with relation to the drop-frame, dac., at the left end of the bed being shown in dotted lines. It will be understood that the drivingpinion does not move lengthwise from the position shown in full lines at the right-hand end, but is shown in dotted lines for convenience. Fig. 3 is a broken cross-section of so much of the press-frame, bed, and drivinggear and cylinder and the operating connections as will illustrate the general features of my invention. Fig. 4 is a perspective detail of a portion of the bed and the registeringrack; and Fig. 5 is a broken detail plan, partly in section, of one of the vertically-sliding rack-bars and connections by which the driving-racks are rocked.

This invention is applicable to what are known in the trade as two-revolution cylinder-presses and also to drum cylinderpresses. The general relation of bed and cylinder may be obtained as in any usual construction. The driving-gears J K may be usual gears to secure synchronous movement, or such may be omitted or substitutes provided.

The reciprocating bed 1 is driven by the pinion 2 on the shaft 3. The bed may be supported on any usual form of carrier 22 on support 23, so as to reciprocate in a horizontal plane under the cylinder. The shaft 3 and pinion 2,f1xed thereon, are driven by any suitable power, the shaft being journaled in suitable bearings, preferably in frame F.

To the bed l there is rigidly connected a drop-frame 4, which drop-frame has parallel top and bottom bars, hangers connecting the frame to the bed, and the end bars, preferably on curved lines. The drop-frame thus forms a rigid structure on which the shifting racks and their moving gears are supported.

Referring now to Figs. l, 2, and 8, 5 and 5 indicate brackets connected to drop-frame 4 and having journal-bearings, in which rockshafts 6 6 are supported, said shaft G being shown parallel with the upper bar of the dropframe, shaft 6 being parallel with the lower bar of said frame. Rock- shafts 6 and 6 are each provided with rack-bars 7 and 7X, which bars have rack-teeth to engage the teeth of pinion 2, but not both at the same time, as will be explained. The rack-bars 7 and 7X are long enough to permit the toothed engagement of the rack-teeth with the pinion to drive the press-bed nearly the whole length of its reciprocation; but, as will be explained, the teeth of the pinion 2 are free from the racks 7 or 7 for a short time at the end of each reciprocation of the press-bed, as these racks 7 7X do not extend the full length of the bed movement.

The pinion 2 bears a cam C at one side thereof, which cam engages a stud ct or ct' on the drop-frame et when the drop-frame and bed are near the ends of the bed movement. The cam O is a grooved cam, so as to embrace stud co from both sides and so cause the completion of the bed movement after the teeth of the pinion are disengaged from the racks 7 or- TX. The shape of the cam C is such as to gradually stop the bed movement and then impart a movement in reverse direction. As the stud a passes from the end of the camgroove O the teeth of the pinion 2 are about in position to engage one or the other of the racks 7 or 7X. It will be understood that the rotation of pinion 2 is continuous in one direction. The cam C will engage the studs a or a' from opposite sides-that is, one of those ICO studs will be engaged from above as the side of the wheel bearing cam C moves downward and the other stud at the completion of the reciprocation of the bed will be engaged from below as the cam is moving upward; but in all cases the parts are so proportioned that the cam C on the pinion engages the stud ct or a of the drop-frame a little before the completion of the movement of the bed in one direction and by such engagement stops and reverses the horizontal movement of the bed. Any of the usual buffers may be employed to relieve the strain on cam C and on studs ct a. As the pinion 2 passes out of engagement with one of the racks 7 or 7Xa cam D on said pinion comes into engagement with one of the pushers b or bx on slide-bars 8 or 8X, these slide-bars being complementary and supported in suitable guideways on the frame 4. The slide-bars 8 and SX are held in slideways, so that the engagement of the grooved camD with the roll or stud b or bx of one or the other of the slide bars shall give a vertical sliding movement to such slide-bar, while not interfering with the reciprocating movement of the bed or drop-frame.

The slide-bars S and 8X have on their inner faces rack-teeth, which teeth engage pinions 9 and 9X, rigidly fixed to the rock-shafts 6 and 6X. The rock-shafts 6 and 6X are intended to rock through one-fourth of a revolution, and the vertical movement of slidebar 8, infiuenced by cam D, is just sufficient to rock such shaft by the engagement of its rack-teeth with the pinions 9 and 9X. The engagement of the cam D with the slidepusher on bar SX after the bed has nearly completed its yhorizontal travel in one direction reverses this rocking of the shafts 6 and 6X.

The rock- shafts 6 and 6 and the rack-bars 7 and 7X, carried by said rock-shafts, are so Aruns out of engagement with pinion 2 just before the completion of the endwise movement of the bed, as explained, cam D engages and slides slide- bar 8 or 8 and so rocks that rack which was in driving position to one side and out of operating position, at the same time rocking the other rack into position to be engaged by said pinion when the bed by operation of cam C shall begin its reverse travel.

1t is preferable to drive the bed in its forward or impression movement by the means of upper rack 7 and to produce the reverse or return movement of the bed by means of the lower rack 7X.

Preferably the gear 9 is of sufficient length to engage the rack-teeth on the vertical rackbar 8, and also a horizontally-moving rackbar 18, which bar 18 is guided in suitable ways, and as the pinion 9 is partially rotated (through one-fourth of a revolution) just be* fore the completion of the bed movement in either direction this bar 18 is reciprocated horizontally, (or two pinions may be used on this end of shaft 6.) Bar 18 is connected by a pivot or other suitable connection to lever 17, which leverisa rigid arm on rock-shaft 16, said shaft 16 being supported in bearings on the bed of the press and having on one side a rack 15.

The rack 15 performs the usual function of the register mechanism of a printing-press by engaging the segment or gear 14 on the cylinder 10.

As seen in Fig. 4, the rock-shaft 16 is longitudinally adjustable with reference to the press-bed by means of the set-screws 21. This lengthwise adjustment of the register-rack is common in this art.

The sliding of rack-bar 18 by means described has the effect of rocking rack 15 out of position to engage the gear-teeth of segment or gear 14 on cylinder 10. (See Fig. 3.) This rocking of the rack 15 is effected at such time that the press-bed may make its backward travel Without interfering with the segment 14 on the cylinder 10.

From the foregoing it is thought the operation of the machine will be fairly understood. The driving-gear is such as to give as nearly as possible synchronous surface travel to the bed and cylinder; but to insure absolute accuracy in this respect the registering-rack and segment are provided. The registeringrack has been heretofore made adjustable and has also been turned out of engagement with the cylinder, and on this part of my invention l do not make broad claims.

1 am aware that it is not new to move a register-rack on a press-bed out of engaging position as the bed returns; but in the machine known to me this movement of the register-rack is effected by fixed cams on the frame and is not eected by direct operative connections from the drivin g-gear of the bed.

I have described the mechanism of my invention-in the best form now known to me; but it must be understood that numerous modifications come Within the scope of my claims, which are intended to cover equivalents and modifications.

The drawings are not made to show proportions, but merely to indicate the relation of parts and are substantially diagrammatic.

lVhat 1 claim is- 1. In a printing-press, a reciprocating bed, a driving-pinion, two rack-bars connected to the bed and at opposite sides of the said driving-pinion, two rock-shafts supporting said IOO IIO

rack-bars, and means for rocking said shafts Y so that one rack shall be turned into alinement with the teeth of the driving-pinion and the other turned out, each rack-bar swinging on its own shaft and at about the conclusion of the horizontal movement of the bed, all combined substantially as described.

2. In a printing-press, the reciprocating bed,

the drop-frame connected thereto,a rock-shaft connected to the upper part of said dropframe, and a parallel rock-shaft at the lower part of said drop-frame, separate rack-bars rigid with said rock-shafts, a driving-pinion, and means for simultaneously turning both of said rock-shafts to carry one rack into alinement with the teeth of the pinion, and for moving the other rack ont of alinement, all combined.

3. In a printing-press, the combination of the traveling bed, a pair of rock-shafts connected thereto, each having a rack-bar attached, pinions on said rock-shafts and a sliding rack-bar engaging the pinions on both shafts, a driving-pinion, and means for moving the sliding rack-bar endwise, whereby the rock-shafts are rocked and the driving rackbars moved alternately into alinement with the driving-pinion, all combined substantially as described.

4L. In a printing-press,the reciprocating bed, the driving-pinion, a rock-shaft at each side of the driving-pinion each provided with a driving-rack and all connected to the pressbed, pinions on said rock-shafts, and a sliding rack-bar connecting the pinions of opposite shafts, and a cam on the driving-pinion engaging said sliding bar to reciprocate the same, all combined substantially as described.

5. In aprinting-press,thereciprocatingbed, the driving-pinion, a pair of rock-shafts each having a rack-bar and connected to the bed, one each side of the driving-pinion, a cam on the pinion, and operating means connected thereto for rocking the rock-shafts and so swinging the drivingracks alternately into and out of working position, and a cam on the pinion operating on the bed to complete the movement when said racks are disengaged, all combined.

(5. In a printing-press,the combination with the bed, of the driving-pinion, the drivingracks, and means for moving the racks into or out of driving position, the cylinder and a register-rack on the bed, and means connected to the driving-racks whereby the registerrack is moved into or out of engaging position with the cylinder, all combined substantially as described.

7 In a printing-press, a reciprocating bed and a register-rack thereon, a cylinder, and register-gear connected to said cylinder, a drivingpinion by which the bed is driven through intermediate connections, a cam moving with said driving-pinion, and operative connections from said cam by which the register-rack on the bed is thrown into or out of engaging relation with the gear on the cylinder, all combined.

8. In a printing-press, a reciprocating bed and a rotating cylinder, a bed-driving pinion and a cam moving synchronously therewith, a rack-bar reciprocated by said cam, a pinion on the bed operated by said rack, a second rack operated from said pinion, and a movable register-rack on the bed moved by said rack, and the cylinder and its register-gear, all combined substantially as described.

9. In a printing-press, the combination of the cylinder and its register-gear, the bed and its driving-gear, and a register-rack on the bed, directly connected to and positively operated by operative connections from the beddriving gear, whereby the register-rack may be shifted into or out of operative relation to the register-gear on the cylinder, substantially as described.

10. In a printing-press, the frame and reciprocating bed, the rigid drop-frame connected to said bed, the rock-shafts supported in bearings at the upper and lower edges of said drop-frame each having a driving-rack rigidly connected thereto, a vertically-sliding rack-bar carried by said drop-frame and engaging pinions on said rock-shafts, the driving-pinion, and means for shifting the vertical rack-bar to rock the rock-shafts and racks alternately into and out of engaging relation with the drivin g-pinion, all combined.

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

PHINEAS M. RANDALL, JR. IVitnesses:

GEO. B. PEABODY, ABEL P. RANDALL.

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