US283201A - Pcterj - Google Patents

Description

3 Sheets-Sh1eet 1.

(No Model.)

- A. CAMPBELL.

PRINTING PRESS.

Patented Aug. 14, 1883.

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(No Model.) 3 Sheets-Sheet 2.

A. CAMPBELL.

PRINTING PRESS. No. 283,201. Patented Aug. 14, 1883.

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PRINTING PRESS. No. 283,201. Patented'Aug. 14, 1883.

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WITNESSES: I INVENTQR: 7

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UNITED STATES PATENT QFFICE.

ANDREW cA vIPBELL, or BROOKLYN, Assicnon TO JOHN MOLOUGHLIN AND EDMUND MCLOUGHLIN, or Nnwxonx, N. Y.

PRINTING-PRESS.

" SPECIFICATION forming part of Letters Patent No. 283,201, dated August 14, 1883,

Application filed June 20, 1882. (Nomodei) To all whom it may concern:

Be it known thatI, ANDREW CAMPBELL, a citizen of the United States, residing 'at Brooklyn, Kings county, New York, have invented certain Improvements in Printing- Presses, being a meansfor effecting the delivery of the printed sheet from the printing cylinder, of which the following is aspecification. I

My invention appertains to. presses of the bed and cylinder class, having a sheet-delivery at the back under the feeding-table, and wherein the sheet is freed before the cylinder has made one entire revolution. Heretofore in nearly all presses of this character the sheet, when freed by the printing-cylinder, is trans ferreddirectly to a second cylinder or drum, (or to a series of narrow pulleys substituted for a drum,) and tapes or fingers carry the sheet with its freshly-printed surface in contact with the drum until the advancing or front edge of the sheet is turned in a downward direction, when it either slides the whole length of afly, or is carried by ordinary tapes until freed by the biting tapes which bind it .to the discharging-drum, or by a biting-roller as a substitute for the tapes. liberated and set violently in motion, it comes in contact with the freshly-printed face of the sheet, arrests the sheet in its forward motion edgewise, and carries it over facewise in an arc until it is placed face up on the receivingtable. The fly rests for an instant and then turns back to receive the next sheet. It will be observed that. in this case the freshly; printed side of the sheetis during its entire delivery in contact with some portion of the delivery apparatus, the peculiar construction of which in all cases presents surfaces moving at two different velocities to the freshly-printed surface upon which the sheet must travel to its final discharge, and therefore must, of necessity, have a sliding motion on some one of the surfaces in contact. This will inevitably smut the sheet to some extent. This differin grooves in the drum, then the surfaces of the tapes willhavea variable velocity. At the point where they break over the drum the up per surfaces of the tapes will have avelocity equal to the velocity of the general periphery of the drum, but beyond this point the whole tape will move with a velocity about equal to that of the surface of the drum at the bottom of the groove, as in the case of any belt and pulley. If no tapes are employed, the sheet must slideover the fingers of the fly which are at rest. Several attemptshave been made to obviate this difficulty, but thus far 110 delivering apparatus has been constructed adapt able to this type of press, except such as con tained the defect above noted, and which would cause more orless mackle or slur.

The object of my invention is to deliver a sheet below or under the feeding-table with the printed side up, and without any portion of the printed surface coming in contact with any portion of the delivery mechanism, or any other part,- wherebyI obtain a clean and perfectly-printed sheet without mackle, slur, or smut, and without reference to the amount of ink employed. To accomplish this I employ means forseizing the advancing edge of the sheet, turning or rolling it, and carrying it back to a rest, and holding it fast while the sheet is turned by the advancing movement .of the cylinder, aided by jets of air which uphold the body of the sheet and assist to turn it. To avoid counter-currents of air exteriorly, which would fold the tail or corners of the sheet back upon the body before it could be laid, I provide a close roof plate or shield, with side plates, arranged over the mechanism, and to ing-table. To avoid disturbing the sheets already laid, I also'arrangethe mechanism in such a way as to hold the edge of the sheet being -delivered out of contact with the pile until the said sheet is fairly laid on the table,

when the said edge is released.

In the drawings, which serve to illustrate my invention, I have not deemed it necessary extend over, or substantially over, the receivto show the entire printing-press, limiting the v illustration to the novel delivery apparatus and to those parts of the press which operate in connection therewith. I

Figure 1 is a longitudinal vertlcal section taken in the plane of line 1 1 in Fig. 2, being I leaves the printing-cylinder and adheres by substantially a side elevation of the delivery mechanism. Fig. 2 is a transverse vertical section substantially on line 2 2 in Fig. 3, the part of the delivery apparatus to the left being in elevation, viewed from the rear of the press. Fig. 3 is aplan of the mechanism, the feeding-table and roof-plate being removed.

Figs. 4 and- 5 are detached sectional views taken on lines 4. 4 and 5 5, respectively, in Fig.

2. Fig. 6 is a'detache d View of the air-valve This position of the cylinder is chosen for the reason that it is at this moment the delivering mechanism has reached the end of its stroke with the last-printed sheet.

On the end of the printing-cylinder is a' cam-groove, c,- in which plays a roller, 0, mounted on a toothed segment, D. This seg ment is mounted on an axis, (1, fixed in the main frame,and oscillated through a prede termined are at every revolution of the cylinder, being actuated by the cam c. The teeth of this segment mesh with teeth on a pinion, c, fixed on the end of a partly-hollow shaft, f, mounted rotatively and transversely in the press-frame and extending across from side to side. On this shaft are fixed two or more arms, g, one of which is hollow, and the cavity in which communicates with that in the shaft. In the ends of these arms is rotatively mounted a hollow shaft, h, .provided with a number of short tubular suckers or nozzles, z i. There is air communication through these nozzles 13 i, the shaft h, hollow arm and shaft f with an air-exhaust pipe, j, Fig. 3, through an ordinary disk cut-off valve, E, which will be referred to more particularly hereinafter.

The arm 9 to the right in Figs. 2 and 3 is the hollow arm, and only the right-hand end of shaft f need be hollow, although it might be hollow throughout and all of the arms 9 be hollow as well.

On turning theeylinder B in the direction of the arrow the cam 0 acts on segment D in a manner to first rotate shaft f and swing the arms 9, with shaft h, over toward the cylinder until the nozzles i assume the position shown in dotted lines at 00 in Fig. 1. Then, as the cylinder continues to rotate, the said parts turn back again, the nozzles z" reaching the point 9 as the grippers with the advancing edge-of the newly-printed sheet (shown in dot v ted lines) reach the same point and release their hold. At this moment the exhaust begins to act and the advancing edge of the sheet atmospheric pressure to'the nozzles z. The

continued rotation of the cylinder swings the nozzles 011 over back again, bearing the sheet toward the position shown in full lines in Fig. 1. The movement of the nozzles is not, however, quite rapid enough to keep the sheet taut or strained as it leaves the cylinder, but

allows it to belly upward in an arch, a series of narrow bearing-rollers, k-two or morebeing provided to keep the sheet up to the cylinder below the point 9 i In order to turn or roll the edge of the printed sheet properly, I provide a means for slowly rotating the shaft it partly around in its bearings as the shaft f swings said shaft 71v back. This means consists of a camgroove in a fixed plate, Z, Figs. 1, 2, and 3, in which plays a stud or roller, Z, on atoothed segment, m, mounted to oscillate on one of the arms 9. This segment meshes with a pinion, m, on the end of shaft 71-.

In Fig. l I have broken away part of plate Z and part of pinion e, the betterto show the parts beyond, and have indicated the shape of the cam-groove in Z by dotted lines at n, as it is on the opposite face of the plate. It will be a sufficient description of this cam-grooveto 5- i say that it is a nearly-circular curve drawn slightly eccentric to the shaft f, and that its effect is to cause the nozzles i to swing, independently of shaft f, through an arc of about one hundred and twenty degrees as they pass from the point 00 to the delivery-point. As the nozzles approach the latter point, however, the roller 1 enters a part of the cam-' groove n, which turns the'nozzles sharply down upon a shelf or rest, 0, which will be re- I05 ferred to more particularly hereinafter. At this moment the exhaust is broken or cut off,

by valve E, and the-sheet is held by the nozzles t on the shelf 0 as a gripper.

I have now described the mechanical devices 1 10 for carrying the forwardedge of the sheet from the printing-cylinder over to the delivery-pointf Other=mcans, however, are employed' to assist in turning over the body and tail of the sheet, in order that it may be prop- 11'5 erly delivered with the printed side up on the receiving-table F. This means I will now describe.

G in Fig. 3 is a blower-pipe, which connects through the valve E and pipe H with an and j ets from the tubes 1) take under the bellyr 0 ing sheet and bear it upward and backward,

being limited .by a-roof-plate or shield, J, which is arranged over the delivery mechanism and extends out over or nearly over the receiving- The lat- 1'25 I gradually turning it over and down, the jets of air cause the'sheet to assume the position shown by the dotted lines 2 in Figs. 1, 4, and

5that is tosay, well on its way toward being turned completely over.

On one of the arms g is a rigid projection, 1', which, when the arms assume the advanced position shown in Fig. 4, impinges against an arm, 5, on the shaftt, to which the shelf 0 is.

attached, and turns said shaft on its axis, thus displacing said shelfand opening the jet-tubes q, the mouths of which stand normally covered by the shelf 0. This causes jets of air from the tubes qto be directed backward horizontally over the sheet to complete its inversion.

The movement of the sheet in straightening.

I out is indicated by the dotted lines zin Fig.1.

Toavoid counter-currents and preventthe air from escaping laterally Imake the roof-plate or shield J solid or unperforated, and provide The shaft t is provided with a spring, 1;, Fi 2, which turns it with side plates or walls, a.

it back and causes the shelf 0 to again close the jet-tubes (1, when the nozzles 1' rise and re lease the sheet. The edge of the sheet is held gripped between the nozzles i and the shelf or the sheets already laid thereon.

rest 0 until the sheet is fairly at rest on the re ceiving-tab1e, and the gripping-point is raised above said table in order not tointerfere with The sheet, in turning, may or may not touch the shield or roof-plate J.

The nozzles 36 are attached to sleeves which slip over the shaft h, an aperture inthe shaft coinciding with the bore in'the' nozzle when the latter is inoperative position. If it be desired to cut off one or more of the nozzles, it is only necessary to loosen the set-screws which secure the sleeves in position on the shaft h and turn said sleeves until the apertures are out of coincidence, when the exhaust w ill be cut off.

wheel w of the same diameter on the axis of,

the printing-cylinder, whereby the valve is caused to rotate in unison with said cylinder. The valve is provided withairecess, a, to connect the exhaust-pipej and hollow shaft f for the proper interval, and an aperture or port,

I), to coincide with the end of shaft f at the instant of delivery to break the exhaust and free the sheet from the nozzles 13. The valve is also provided with a recess, (1, of variable width to connect the blower-pipes G and H. The object in making this recess of variable width is to provide an increased volumeaof air at the moment of delivery, in order to supply the tubes qwhen opened, and to furnish a diminished blast at the beginning.

over with the printed face uppermost.

until the sheet turns completely over.

table. As the nozzles 'i bear its edge onward, I Rotary-disk valves for cutting off and adand I have not deemed. it necessary to show these in the drawings.

' I wish it understood that I do not limit myself to the precise construction and arrangement of the mechanical parts herein shown, as they may be varied somewhat without departing from thespirit of my invention-as,-

for example, the cam 0 may not be on the cylin- (ler B, but be driven from the same motor, and the valve E may be driven by other means thanthegearing shown. I

It must be understood that thesheet is seized by its advancing edge, carried back only far enough to clear themechanism, and turned The carrying back is only required in order to clear the mechanism and to bring the body of the sheet over the air-jets. .Some room is also required in which to turn the sheet, and the advancing edge is held down fast in position The roof-plate J prevents the sheet from being blown away by the jets. be impracticable to regulate the blast so nicely as to suspend the sheet properly in the air.- VVith it it is only necessary that the blast shall have force enough, and an excess of force within limits will do no harm.

Having thus described my claim 1. A sheet-delivery mechanism for cylinder printingpresses, constructed and ar anged to operate substantially as set forth, and comprising, first, means for taking the advancing edge of the sheet by its margin, means for turning or rolling said edge and carryingit over and clamping it down upon a rest, and for holding itso clamped until the body of the sheet is turned by the movement of the printing-cylinder, second, an air-blast device arranged to assist in turning the body and tail of the sheet; third, a close roof-plate or shield, with side plates arranged over the delivery mechanism to prevent counter-currents; fourth, means for releasing the sheet when it is laid on a receiving-table; and, fifth, a receiving-table for the sheets, arranged under the shield, all combined and arranged to operate substantiallyas and for the purposes set forth. I

2. In a sheet-delivery mechanism for printinvention, I

ing-presses, the mechanism for gripping. and

Without it it would 3. A sheet-delivery mechanism for printing presses, substantially as described, comprising two or more nozzles connected with an airexhaust apparatus, and arranged totake the 5 advancing edge of the printed sheet from the printing-cylinder and carry it back to the delivery-point, suitable mechanism for actuating said nozzles, jet=pipes connected with a blowing apparatus arranged to emit jets of air un- 1o der the sheet as it is being borne back, and a suitable Valve or valves to control the exhaust and air currents, all arranged to operate substantially as set forth.

4. The combination, in a sheet delivery 1 mechanism, of the air-trunk I, provided with jet-tubes p and q, said trunk being connected with a controlled air-blast, the roof-plate J, and the shelf 0 for closing the jet-tubes q, all arranged to-operate substantially as set forth.

20 v 5. The combination of theprinting-cylinder,

the oscillating segment 1), the cam O, for actuating said segment, the shelf f, bearing the pinion c and arms 9, the shaft 72, provided with nozzles t and pinion m, the segment on, the 2 5 fixed cam-plate 1, provided with a cam-groove to actuate segment m, the shelf 0, arranged to be depressed by arm 9, and the air-trunk, provided with j et-tubes p and q, and arranged to receive a regulated supply of air from an airforcing mechanism, all arranged to operate 30 substantially as set forth.

6. The combination, in a sheet delivery mechanism for printing-presses, of an oscillating shaft, f, partly hollow and connected with a controlled exhaust, and provided with arms 3 5 g, mechanism, substantially as described, for

' oscillating said shaft in unison with the movements of the printing-cylinder, ahollow shaft, 71, provided with suction-nozzles 'i, and rotatively mounted in the arms 9, mechanism, constructed substantially as described, for giving the shaft an oscillatory movement independent of the shaft f, whereby the sheet is turned over as it is borne back, jet-pipes connected with a blowing apparatus arranged to emit jets of air 45 under the sheet as it is being borne back and turned, and a roof-plate, J, all arranged to operate substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

ANDREW CAMPBELL.

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