US1468457A - Duplicating and like printing machine - Google Patents

Description

Sept. 18, 1923.

W. CHIPPERFIELD DUPLICATING AND LIKE PRINTING MACHINE Filed April 15. 1921 5 Sheets-Sheet 2 Sept. 18, was. Lamas? W. CHIPPERFIELD DUPLICATING AND LIKE PRINTING MACHINE Filed April 13 1921 3 Sheets-Sheet 5 avweutoz W ig aM Q Md m MW @1 1; v wad/Mg Patented Sept. 18, 1923..

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DUPLICATING AND LIKE PRINTING- Application filed. April 18, 1921.

To all whom it may concern:

Be it known that I, War/ran Cmrrnn- FIELD, a subject of the King of Great Britain, residing at Kinkora, Great Nelmes,'

Hornchurch, Essex, England, have invented certain new and useful Improvements in Duplicating and like Printing Machines ((for which I have filed an application in reat Britain January 19, 1920, No. 1647),

of which the following is a specification.

l6 roller and the printing cylinder is prevented 2 0 the throw-out lever causes contact between whenever a sheet of paper fails to be fed into the machine. In previously constructed machines with which I am familiar the arrangement has been such that movement of the impression roller and the printing 0 linder whether a sheet of paper has been ed thereto or not, and if no paper has been fed an imprint appears on the impression roller.

This has necessitated either the removal of the roller for cleaning, or else a quantity of paper has to be fed through to remove the imprint. With such machines, when the throw-out lever is in its inoperative or 3 throw-out position the impression roller is still rotated by the printing cylinder, but the roller is not in actual contact with the printing surface, the arrangement being such that while contact between the cylinder and impression roller is interrupted, such interruption is not sufiicient to cause the gear wheels mounted on the cylinder and roller respectively to be separated.

In accordance with my invention means are provided whereby movement of the throw-out lever into operative or throw-in position does not bring the surface of. the impression roller quite into contact with the printing surface on the cylinder. When a sheet of paper is fed into the machine mechanism is put into operatlon which causes the impression roller to move into operative position, to grip the sheet of paper between the roller and'the cylinder when the paper arrives in printin position and to effect the printing thereo Should no sheet of paper be fed into the machine the mechanism referred to is not brought into operation. I accomplish these results by means of a finger or fingers which are lifted when the sheet Serial No. 481,015.

passes into the machine. When the fingers are not lifted, the throw-out lever being moved into operative position, a knife edge on a lever contacts against a pawl, this causing the compression of a spring which results in holding the impression roller in a position out of contact with the cylinder, in the preferred embodiment of my device. When, however, the fingers are lifted by the passage of a sheet of paper, the knife edge and projectionon the lever does not strike the pawl, which has been raised out of the path of the knife edge, the result being that the spring referred to is permitted to expand and to move the impression roller, at the right moment, into operative position.

In order that a clearer understanding of my invention may be hadv attention is hereby directed to the accompanying drawings forming part of this application and illustrating one embodiment of my invention.

In the drawings, Fig. 1 represents a rear elevation of a duplicating machine or like printing machine containing my invention,

1g. 2 1s a transverse view showing the mcchanlsm of the invention in inoperative position, Fig. 3 is a'similar view, the throwout lever being moved into operative position, the mechanism being in operative positlon preparatory to printing, Figure 4 represents a partial reverse view of the mechanism shown in Fig. 2, Figure 5 is a view similar to that shown in Fig. 4, representing the posit-ions of the parts when a sheet of paper fails to be presented between the impression roller and the printing cylinder and Fig. 6

is a similar view showing the position of the parts during the printing operation.

The printing cylinder 1 is mounted on a shaft 2 supported between the side standards 3 and has a spur gear t secured thereto. This gear is in constant engagement with a spur pinion 5 mounted on the shaft 6which carries the impression roller 7.

Shaft 6 is supported centrally in links 8, the links being pivoted at one end to levers 9 which are secured to a rock-shaft 10 extending between the side standards 3. Levers 9 have extensions 9' beyond rock-shaft 10, a shaft 11 being carried thereby. A bar 12 is secured on shaft 11 and secured to this bar is a plate 13 against which abuts a spring 14, the other end of the spring hearing against the end of an arm 15 which is secured on rock-shaft 10.

The opposite or right hand ends of lever 8, ,as shown in Figs. 2 and 3, aresupported by. meansof rollers 16 thereon which rest on bearings 17 or 18 which are'prov ded on the upper surface of members 19, which are adjustably mounted in the heads of milled thumb nuts 20 operable on screws carried by the bar 12.

Rock-shaft 10 carries a lever 21 secured thereon at the outer side of one of the side standards 3, and this lever is raised or depressed hy a pivoted connection with a hand operated throw-out lever 22.

Secured on shaft .11 is a two-armed lever 23 one arm of which carries a roller-24 which is adapted to contact against the surface. of cam 25 attached to or formed on one of the side walls of printing cylinder 1. The other arm 23' of the lever is provided with a knife edge or projection 26. Supported between the side standards 3 is a guide 27 and a bracket 27 which has open-' 1n formed in the opposite end ortion of thg same to receive a spindle28. lhi's spindle has secured thereon a finger or fingers 29 and further carries. an armi30" having ivoted thereon a swinging pawl 31 one surace of which is adapted to slide freely against a tooth formed on an arm 32 mounted on a stud 33. A spring 34 is secured at one end to a pin mounted on one of the side standards 3, the other end being fitted on the pin which constitutes the pivotal connection between one of the links 8 and arms 9, so as to constantly tendto draw links 8 to the right, referrin to Figs. 2 and 3.

The operation of t e device is as follows. In the position of the arts shown in .Fig. 2 the machine is'in its inoperative position, the throw-out lever 22 being down whereby the lever 21 is raised, rock-shaft 11 having been swung downwardly about shaft 10 as a centre. Accordingly, the impression roller 7 has been lowered and moved away from the printing cylinder 1 somewhat, and the roller 24 carried by arm 23 has been moved away from the path of cam 25. The various arts have swung freely with shaft 10 and accordingly spring 14'is not under compression and therefore rollers 16 rest upon their upper supports 17 on members 1.9. The movement of the impression roller away from the printing cylinder has been insuflicient to cause complete disengagementof'the teeth of pinion 5 with spur gear 4.

When the throw-out lever 22 is raised into its operative or throw-in position shown in Fig. 3, shaft 10 is rotated thereby in a counter-clockwise direction, referring to Figs. 2'and 3, members 19 carrying the right hand ends of links 8 are raised and the 1mpression roller tends to move toward the rinting cylinder. Complete enga ement,

owever, is prevented either by ro ler 24 striking against cam 25 or by knife edge 26 abutting against the front edge of the pawl 81 as shown in Fig. 5. If no sheet of paper is fed into the machine, and cam 25 is not in the path of roller 24, knife edge 26 will abut against awl 31 as stated which interrupts 'thecomp ete movement of lever 23 against the compression of spring 14 between 1 the plate 13 and arm 15. This incomplete movement of lever 23 and member 19 results'in rollers 16 dropping down on to the lower roller supports 18, the consequent lowering of the impression rollerpreventing the latter from contactin with the printing cylinder. .Were comp ete movement permitted, member 19 would have moved surface 17 under rollers 16 and would have raised the impression roller into con-- tact with the cylinder. 1

When, however, a' sheet of paper is fed through the feed'rollers X the sheet is'deflected upwardl between the guide 27'. and

bracket 27 an strikes against the under surfaces orsurface ofthe fingers. or finger 29. This raises finger 29 somewhat, sufiiciently to rook-spindle 28 and to lift arm 30 and pawl 31v to an" extent suflicient to' move pawl 31 out of the path of knife edge 26 so that the latterwill notstrike the pawl,'.

is fed into the machine. This engagement of the roller against the cam prevents the complete movement of arm 23 and parts connected thereto and accordingly compaper are fed presses spring 14. The result of incomplete movement of lever 23 and member 19 combined with complete movement of links 8 to the left is to move rollers 16 from their upper supports. 17 to their lower supports 18, or to maintain the rollers in their lower positions if they were already in such lower positions. The finger 29 is raised by the advancing sheet of paper, so that knife edge 26 does not strike against pawl 31. Roller 24 will then ride off of cam 25 as the forward edge of the paper reaches the printing position between the impression roller and the cylinder. When roller 24 rides oil of cam 25 spring 14.is thereby allowedto expand whereby members 19 are moved to the left and rollers 16 are forced upwardly on to the upper bearings 17, so that the teeth of pinion 5 and gear'4 come into full engagement and impression roller 7 contacts against the surface of the printing cylinder 1, or rather, against the outer surface of the paper sheet which is thereu n firmly pressed against the cylinder, warded between the impression roller and the cylinder, and imprinted upon.

naeaaav not pass through the feeding rollers, the pawl 31 will not be lifted and when the roller 24 of lever 23 rides ofi the cam 25 the two armed lever is arrested by the knife edge 26 striking against the face of pawl 31 as shown in Fig. 5, and spring 14 remains compressed and the impression roller is lowered out of contact with, or is prevented from. coming into contact with the printing cylinder in the manner previously described.

When the printing is completed a downwardmovement'of throw-out lever 22 causes the impression roller to be moved into its farthest outward position, such action being assisted by spring 34 which is under tension during the printing operation.

The milled headed nuts regulate the, tension of the impression roller with the printing cylinder.

It should be understood that my invention is not limited to the details of construction described but is as broad as is indicated by the accompanying claims.

What I claim is:

1. In a duplicating machine,'the combination of a printing cylinder, an impression roller, a throw-out lever, means operable thereby for moving said roller towards and away from said cylinder, means for preventing contact between said roller and cylinder, and means operated by the passage of a paper sheet into position to be printed upon, when said lever is in throw-in position, for overcoming said preventing means.

2. In a duplicating machine, the combination of a printing cylinder, paper feed means, an impression roller, a throw-out lever, a stop member, an arm adapted to en gage said stop member when said lever is raised, supporting means for said roller such that raising said lever moves said roller toward said cylinder, spring mechanism coacting with said supporting means for holding said roller away from. said cylinder when said arm engages said stop member, and means for moving said stop member out of the path of said arm when a paper sheet passes through said feed means.

3. In a duplicating machine, the combina\ tion of a printing cylinder, having ac-am thereon, paper feed means, an impression roller, a roller-bearing arm, a throw-out lever, supporting means for said impression roller and arms such that movement of said lever in one direction or the other moves said rollers towards or away from said cylinder, spring mechanism connected to said impression roller for holding said roller away from said cylinder irrespective of movement of said lever when the roller on said. arm engages said cam, and for holding said roller away from said cylinder when the roller on said arm moves away from said cam into contact with said cylinder, and no paper is fed through said paper feed means.

4. In a duplicating machine, the combination of a printing cylinder, an impression roller, links supporting said roller, arms pivotally carrying one end of each of said links, means supporting the opposite end of said links, and means for raising said last named means when a paper sheet is fed into the machine, to cause coaction between said roller, cylinder, and sheet, and for preventing the raising of said means when no paper sheet is fed into the machine.

5. In'a duplicating machine, the combination of a printing cylinder, an impression roller, links supporting said roller, pivoted arms to which one end of each of said links is pivoted, supports for the opposite ends of said links, having higher and lower surfaces at greater and less distances from said arms, spring means governing the angular position of said links, paper feed means, and means for acting on said sprin means when no paper is fed through said eed means, to position said opposite ends of said links on said lower supporting surfaces, away from said cylinder. 7

6. In a duplicating machine, the combination of a printing cylinder, an impression roller, links supporting said roller, pivoted arms to which one end of each of said links is pivoted, supports for the opposite ends of said links, having higher and lower surfaces at greater and less distances from said arms, a throw-out lever, paper feed means, means tending to move said opposite ends of said links on to said higher supporting surfaces when said lever is moved into throw-in position, means preventing such movement when no paper is fed through said feed means, and means operated by passage of paper through said feed means to render said preventing means inoperative.

This specification signed and witnessed this 18th day of March, 1921.

WALTER GHIPPERFIELD.

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