US612873A - Walter scott - Google Patents

Description

Patented Uct. 25, |898.

- No. -sI2,a73.

W. SCOTT. PRINTING MACHINE. (Application led Nov. 23, 1894.)

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- PRINTING MACHINE.

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UNITED STATES APATENT OFFICE.

VALTER SCOTT, OF PLAINFIELD, NEV JERSEY.

PRINTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 612,873, dated October 25, 1898.

Original application led .Tnly 26, 1893, Serial No. 481,520. Divided and this application filed November 23,1894. Serial No. 5 29,730. (No model.)

To all whom t may concern.-

Be it known that I, WALTER SCOTT, a citi-` zen of the United States, and a resident of Plainfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Printing-Machines, of which the following is a specification.v

The invention relates, primarily, to printing-machines wherein more than one color is impressed upon the paper between a reciprocating bed carrying a number of forms and an impression-cylinder; but some of the features are equally applicable to machines printing in but one color.

The objects of the invention are to lay the edges of sheets fairly on the bevel of drumcylinders, to prevent the backward motion of the driving mechanism for the bed at certain or all times, and to improve the general operation of the machine.

To these ends the invention consists of combinations of devices hereinafter described, and is more particularly pointed out in the appended claims.

The preferred form of the invention is shown in the accompanying drawings, forming part of this specification, in which- Figure 1 is a longitudinal vertical sectional View showing the detent mechanism preventing backward motion of the driving mechanism. Fig. 2 is an enlarged view of the said detent mechanism. Fig. 3 is a detail View of a friction-clutch for holding the pawl of the detent mechanism clear of the ratchet during the forward motion of the latter. Fig. 4. is a cross-sectional view of the feeding and impression cylinders, showing the grippers of the latter wholly within the periphery thereof; and Fig. 5 is a detail of the feeding and impression cylinders. Fig. 6 is a diagrammatic side view showing the mechanism for rotating the impression stop cylinder and the means for rendering the same inoperative at will. Fig. 7 is a detail of the starting and stopping mechanism for the stop-cylinder. Fig. 8 is a detail view of the impression-cylinder. p

The machine shown by me inthe accompanying drawings in its general features "embodies the same principles as those in the machine described in my Letters Patent of the United States, dated October 3, 1893, numbered 505,961. In the last-named machine there are a two-revolution stop-cylinder, with feed and deliverylcylinders, and a reciprocating bed carrying two forms, inkers for each form, and in case of lithographie printing dampening devices for each form also. In the machine shown in the present case the same general features exist.

Referring to the accompanying drawings, thereference A marks a suitable framework supporting the moving parts the machine.

The reference T marks the reciprocating bed, upon which are supported two colorforms. These forms may be letter-press or lithographie or other kinds. The first colorform is indicated by the reference 1 and the second by the reference 2. The bed also carries ink-tables 3 and 4.

The reference I' marks the ink-rollers coacting with form 1 to ink the same, and I2 the `inkers for form 2.

The reference w' 'indicates the dampening devices for form 1, and L02 like dampeners for form 2 in case lithographie forms are used.

The reference F indicates the fountain and distributing rollers for table 3, and F2 a like arrangement for the table 4.

The impression-cylinder is marked C, the feed-cylinder F, and the delivery-cylinder D. The feed and delivery cylinders are geared to the impression-cylinder directly. The impression-cylinder C has a gear 127 thereon, which meshes with the gear 12S on the delivery-cylinder and the gear 129 on the feedcylinder. Any suitable mechanism for operating the grippers of the cylinders G, F, and D may be used. The impression-surface of the cylinder C does not extend clear around the same, but is removed or cut away, as indicated by the reference 5, so that during the return motion of the bed the forms thereon will not touch the said cylinder, which at that time is stationary. The feed and impression cylinders are provided with suitable sheetretainers, asgrippers G and 7, respectively. Sheets are supplied in any suitable way to the feed-cylinder F, as from a feed-board 8 and gages 9. The printed sheets are run by IOO the delivery cylinder or pulleys D upon fliers 10, which lay thein on board 12. Tapes may be used in conjunction with this delivery.

Power to drive the machine is received from the shaft S, which has a gear 13 thereon meshing with a gear 14 of -larger size, supported on a shaft or stud in the machine. The crank 15 is rigidly connected with the gear 14. A rolling gear-wheel 16, meshing with the stationary rack 17 and the rack 18 of the bed T, is connected with the crank 15 by arod 19 in awell-known manner. The bed T has a rack 20 at one side thereof for coaction with the mutilated gear 21 of the cylinder C. At the other side of the bed, at the middle thereof, is a short rack 22, movable up and down on the bed, and coacting, when in its upper position, with the gear-segment 23 on the cylinder C. The rack 22 is supported by the belllever 24 and link 25, which together form a toggle-joint. The free end of lever 24 is provided with a friction-roller 26, for coaction with the cams 27 28 fixed to the frame of the machine. Suitable stops (not shown) limit the motion of the bell-lever 24 in the extreme positions of the rack 22. The cam 28 lowers the rack 22 and the cam 27 raises it to the position in which it coacts with the gear 23. At the extremes of motion of the bed T its rack 20 is out of mesh with the gear 21, for the mutilated portion of the latter at that time is in the position shown in Fig. 19 and allows of the back-and-forth motion of the rack without touching it.

For the purpose of starting and stopping the cylinder C it is provided with the toothed portion 29, andavibrating arm 30is provided with a movable toothed portion 31 for engaging said toothed portion 29. The arm 30 receives its motion from the shaft of the gearwheel 14 or some part of the machine moving in unison therewith. The said shaft is provided with two cams 32 33, coacting, respectively, with the rollers 34 and 35 of the arm 36, which has a pivot at 37. A link 38 connects the arm 36 with the arm 30. The sliding bar 31 is provided with an eye 39 to fit on the eccentric 40, which is fast on the shaft 41.` A gear 42, fast on the shaft 41, meshes with a geared segment 43, secured to the rock-shaft 44, pivoted in the frame of the machine. A lever 45, fast to the rock-shaft,

,serves to move the same and the connected parts, whereby the bar 31 is moved into or out of engagement with the tooth 29, before described. lVhen the bar 31 and tooth 29 are in engagement and the other parts are in the positions shown in Fig. 6, on the forward motion ofthe bed the cylinder C is turned by the bar 31 until its gear 21 meshes with the rack 20. At the end of the first revolution of the cylinder C itis carried over the dead-point by the engagement of rack 22 with the segment 23. At the end of its second revolution the bar 31 rolls into mesh with the tooth 29 and stops the cylinder C. At the same time the cam 28 lowers the rack 22. During the return stroke of the bed the cylinder C is stationary. The cams32. 33 are so shaped that the arm 30 moves to the left in Fig. 6 on starting the cylinder C and moves to the right of the position there shown at such a time as not to interfere with the tooth 29 at the end of the first revolution of the cylinder and rolls into mesh with the tooth 29 toward the end of the second revolution of the cylinder C.

In order to bring the sheet-retainers of the impression cylinder within the periphery thereof, so that they will not strike the lithographic stone or other form on the bed and to lay the margins of the sheets thereon, I bevel the drum portion d of the cylinder C at the receiving edge thereof (see reference e) and provide the feed-cylinder with a rib f to iit the said bevel. The sheets are taken by the cylinder F upon the bead or ribf and are received by the cylinder C upon the bevel e. Suitable notches (not shown) are cut in the drum portion of the cylinder F to allow the grippers of cylinder C to pass, andlike notches (not shown) may be cut in the drum portion of cylinder C to allow the grippers of cylinder F` to pass. The effect of this construction is to allow the form to extend beyond the drum portion of the cylinder @,whereby larger forms may be used without being struck by the grippers of the cylinder, and also the print may begin closer to the edge.

The devices shown for preventing backward motion of the driving mechanism at any or all times will now be described. The driveshaft S has fast thereon a ratchet-wheel106, with which a pawl 107, pivoted to the frame A, may engage. This would prevent any backward motion of the mechanism; but I prefer to be able to move the bed back and forth, except in certain positions thereof. For this purpose mechanism is provided .which holds the pawl out of the ratchet except in certain positions of the bed, hereinafter mentioned, and which in those positions will cause the pawl to engage the ratchet if from any cause the shaft S should start to reverse its motion. The mechanism shown by me for this purpose consists of a` cam 108 on the shaft 109 of the gear-wheel 14, the said cam consisting of opposite circular portions 109", separating which are the circular portions 110 of shorter radius, the rod 111 having a friction-roller 112 for coaction with the cam, the said rod being suitably connected with the pawl113 and being supported by the swing-arm 114, an arm 115, connected with pawl107 by link 116 and with the shaft S or the ratchet-wheel 106 by a suitable friction device or clutch. The friction device shown consists of rings of paper or hard fiber or other material 117 between the annular part 118 of the arm 115 and the side of the ratchet 106 and the side of cap-piece 119, secured to the ratchet. Suitable coil-springs 120, resting in sockets or in a groove in the ring 118, maintain the pressure. The arm 115 is so placed that its motion in one di- IOO IIO

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rection is limited by a suitable stop, as a portion of the frame A. (See Fig. 2.) Its motion in the other direction is limited by the pawl striking the ratchet. The full arrow in Fig. 2 indicates the normal direction of rotation of the shaft S, and the full line indicates the normal position of the pawl, arm 115, and link 111. When the cam 108 d is in such position that either of the portions IO 110 is opposite the roller 112 and the shaft S starts to reverse its motion, as indicated by the broken arrow, the pawl is at once thrown into the ratchet and the machine stops. O'ne or the other of the depressed portions 110 of the cam 108 is opposite the roller 112 whenever the roller 26 of the bell-lever 24, operating the short rack 22 on the bed, is on the inclined portion of either cam 27 or cam 28, hereinbefore described. When the roller 112 is opposite eitherof the raised parts 109 of cam 108, the pawl is held out of the ratchet thereby, and the bed may be moved backward.

The mechanism shown for preventing the rack 22 from striking the gear-segment 23 during the reciprocation of the bed will now be described. On the same side of the machine and in the vertical plane of the cams 27 28 I arrange the T-shaped slide 121, which has a straight top,with inclines leading down wardly therefrom at the end, and is suitably mounted in the framework to allow of it-s up-and-down motion. Pivoted upon a stud in the framework is the lever 122, which engages the cam 121 by a slot and pin, as shown, and which is connected with an arm of the rock-shaft 44 by a rod 124. When the lever 45 is moved to the position shown in Fig. 6, the T-slide 121 is moved to the position shown therein and the slide-bar 31 is moved downward to disengage it from a tooth 29. With the parts in these positions the bed may be recipro` cated at will without any motion of the impression-cylinder and without any danger of breaking of parts, for the rack 22 is moved to its lower position and held there as it passes the cylinder C by the cams 125 126 and the top of T-slide 121. On moving the lever 45 to the left in Fig. 6 (the bed being in the position there shown) the slide 3l is caused to engage the tooth 29 and the T-slide 121 is moved downward to be out of the path of the roller 26. When it is desired to ink up the ink-tables and the hiking-rollers before doing any printing, the lever 45 is moved to the position shown in Fig. 6, thus disconnecting the tooth 29 and slide 31 and moving up the T- slide 121 to the position there shown. After the distribution and before beginning the printing the lever 45 is moved to the left in Fig. 6, thus connecting the slide 31 and tooth 29 and moving the T-slide 121 downward to its inactive position; also, the automatic mechanism is disconnected, as in Fig. 6. This leaves the machineready for work.

I prefer to feed the sheets to the impression-cylinder so that a fresh sheet will be fed.

thereto when the grippers thereof pass the feed-cylinder during the first revolution thereof, whereby the first color impressed upon the sheet comes from the form 1 (see Fig. 1) during the second revolution of the impressioncylinder, and the sheet remains on the impression-cylinder during the return motion of the bed and receives a second color from the form 2 during the first revolution of the impression-cylinder on the next printing stroke of the bed and is delivered to the grippers of the cylinder D when it reaches them, as this allows a short time for the first color to become somewhat dry before the second color is impressed upon the sheet.

Of'course the construction shown and described for causing the impression-cylinder to make two revolutions may be inverted-that is, the movable part may beon the cylinder and the iiXed part on the bed-and in such case the movable segment (not shown) may be on the end of the cylinder where the mutilated gear is herein shown and coact with the rack 20, all as shown in my Letters Patent No. 505,961, aforesaid, and the segment may be moved to its inactive position during the inking up by suitable means.

Many changes in details and in groups of mechanism may be made without departing from the spirit of my invention.

This application is a division of my application for Letters Patent iiled July 26, 1893, Serial No. 481,520.

What I claim as my invention, and desire to secure by Letters Patent, is4

1. The combination of a two-revolution stop-cylinder, a mutilated gear and a gearsegment on said cylinder, a bed, a fixed rack on said bed, a movable rack on said bed, means for moving said movable rack into and out of position for coaction with said segment during the operation of the machine to print, and mechanism adapted to be thrown into and out of action at will for lowering the said movable rack so it will not coact with said segment atall, whereby the bed may be moved to and fro without motion of the cylinder, substantially as described.

2. The combination of a two1revolution stop-cylinder, a mutilated gear and a gearsegment thereon, a reciprocating bed, a rack movable up and down thereon at the middle portion thereof, a xed rack also on said bed, a movable cam for moving said movable rack out of its working position, and means for lowering said movable rack so as to clear the segment,whereby the bed may be reciprocated without motion of the cylinder, substantially as described.

3. The combination of a two-revolution cylinder, mutilated gear 21, gear-segment 23, bed T, movable rack 22, cam-plates 27, 28 for operating said rack 22, a rack 20 fixed on Said bed, T-slide 121 having cams 125, 126, and means for moving the slide, substantially as described.

4. The combination of a feeding-cylinder, a receiving-cylinder, a bevel on the receiving- IIO cylinder at its sheet-receiving edge and a rib on the feeding-cylinder to lay the sheets on the said bevel, substantially as described.

5. The combination of cylinder F, a rib f thereon, cylinder C and abevel c thereon, substantially as described.

G. The combination of an impression-cylinder, a driving-shaft and mechanism for connecting said shaft and cylinder, With a ratchet iixed upon said shaft, an arm pivoted on said shaft, a paWl coacting with said ratchet, a stop for limiting the motion of the arm, frictional devices for connectingthe arm with the shaft, a link connecting said arm and said paWl,and mechanism for preventing said pawl from engaging with said ratchet except at certain times, substantially as described. 7. The combination of a reciprocating` bed, an impression cylinder, a driving-shaft, a ratchet iiXed thereon, a paWl, an arm pivoted on said shaft, a stop limiting its motion, a friction device connecting the arm with the shaft, a connection between said arm and said pawl, a cam and connections preventing said pawl from engaging said ratchet except at certain times, substantially as described.

8. The combinationofthereciprocatingbed, an impression-cylinder, the shaft S, ratchet 106, dog 107, rod 111, arm 114, cam 108, arm 115, link 116, a friction-clutch, and connections from the shaft to the bed, substantially as described.

9. The combination of a two-revolution stop-cylinder, a toothed segment thereon, a to-and-fro moving bed for eoaction With said cylinder, an up-and-down movable rack on said bed for eoaction with said segment, mechanism for so moving said rack, a rotary driveshaft and mechanism for moving the bed, a ratchet-Wheel connected With said shaft, a detent yieldingly connected With and operated by said shaft to keep the detent disengaged from said ratchet-Wheel during the normal rotation of the shaft, and a cam connected with the detent and timed to permit motion of the same on reversal of the shafts motion only When the rack-operating mechanism has not completed the motion of the rack, substantially as described.

10. The combination of a two-revolution stop-cylinder, a toothed segment thereon, a to-and-fro moving bed for eoaction With said cylinder, an up-and-down movable rack on said bed for eoaction With said segment, mechanism for so moving said rack, a rotary driveshaft and mechanism for moving the bed, the ratchet-Wheel 10b' on said shaft, a pawl (as 107), an arm 115 frictionally connected with said shaft, a. link 116 connecting said pawl and said arm, a cam 108, and a link 111 connected to said paWl and operated by said cam to disengage said pawl from said ratchet- Wheel, the parts being timed and operating, substantially as described.

11. The combination of a two-revolution stop-cylinder, a mutilated gear-Wheel thereon, a reciprocating bed provided with a rack for eoaction With said gear-Wheel, toothed gearing containing an independently-movable disengageable member for carrying said cylinder over from the first to the second revolution thereof, means for moving said movable member into and out of its Working position, a rotatory drive-shaft and mechanism for driving said bed, a ratchet-Wheel connected With said shaft, a detent yieldingly connected with and operated by said shaft to keep the detent disengaged from said Wheel during the normal rotation of the drive-shaft, and a cam connected with the detent and timed to permit of the motion of the same on reversal of the motion of the shaft only When the said'disengageable member is not disengaged, substantially as described.

Signed at Newr York city, in the county of N eW York and State of New York, this 22d day of November, A. D. 1894:.

VA LTER SCOTT.

Witnesses:

G. W. HOPKINS, R. W. BARKLEY.

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