US1341693A - Printing-press - Google Patents

Description

J. WHITE.

PRINTING PRESS.

APPLICATION FILED SEPT. 24. 1919.

Patented June 1, 1920.

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- JOSEPH wHITE, E MIDliLESE-X, NEW JE-EsE ns sIGNoE TO HAL-L PRINTING PRESS COMPANY, OF D N LLEN, NEW JERsEY, A cbRPoEArIoN OF NEWJEESE'Y.

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To qll'whomz't may 0mm.- Be it known that I, JOSEPH WHITE, a citizen of the United States, residing at Middles'ex, county of Middlesei, State of NewJersey, have invented certain new and useful Improvements in Printing-Presses,

of which the following is a specification.-

- in which provision is made for separating or 10' This invention relates to printing presses tripping some or all of the cylinders at prede erniined times, and particularly such a printing press in which the separation of the cylinders iscontrolled by the presence or absence of a sheet being fed to the press.

. In some form of presses the printing surfaces are arranged so'that they are normally in contact at the time when a sheet is brought to rest against the'feed gages preparatory' to, being taken into the press. In

such presses, if the separation of the1cylinder is to be determined by the absence of a sheet atthis gage, then the cylinders are separated when only partial impression has been made, thus spoiling one or more sheets.

This is particularly liable to occur in oifset presses in which the tripping is brought about by moving one or more of the cylinders simultaneously.

One of the objects of my invention is to provide an arrangement by which the se aration' of the cylinders can be contro led from a point remote from the front gage s0 as to provide. sufficient time to separate the cylinders before the 'printing surfaces therej on come into contact, and likewise to restore such cylinders to printing position so thatthe beginning of their surfaces will come into contact when a sheet has been presented at such remote point. 'Another object ofmy invention is to improve the tripping mechanism and provide such a device which will be readily controlled from a remote point.

With these and other objects in View, my invention consists of certain novel features" of construction, combination and arrange: ment of parts as will be more fully described and pointed out in the appended claims. i

In the drawings, Figure l is a sectional side elevation of one form of printing press to which my present invention has been ap- Specification of Letters Patent. 1 Patented J '1,"- i1920 Application filed September 24,1919. Serial No. 325.945.

i has an impression surface 14 and a set of sheet grippers 15 operatedin the usual man:

ner to close on -the front edge of a sheet placed against the usual front gage 16, the

sheet in the form illustrated being carried down to the gage 16 by a series of {endless-- tapes 17 The offset cylinder 12 is provided with a printing surface 18 which is provided with face 19 andthe usual printing form which in this instance is a planographic plate. 20, 20 are the inking'roller shown an arrangement for separating the form and blanket cylinders only, but it will.-'.

be understood that a similar arrangement may be provided for separating the blanket the usual offset blanket, and the form cylin der 13 is providedwiththe impression sur- 75 In-theillustrative form of press I havej and impression cylinders. This latter separation is, however, of the usual type, and, as

usually designed, is con-trolled'bythe absence of a sheet against the gage 16. Such an arrangement being well understood by those skilled in the art, further illustration or description will be unnecessary to an understanding of my present invention;

The separation of the form and blanket cylinders in the illustrative form of my inventon is brought about by mounting the bearings of the form cylinder 13 in aneccentrio bushing 21 of the usual type, this bush- 'ing being connected in a rod 22 with an arm 23 connected to a sha t 24. It will be understood that the bushing 21 and arm 23' are duplicated oneach side of the press." At

tached to the shaft 24 is a double-ended arm 25 provided with pins 26- and 27. A fork 28 having projections 29 and 30, is mounted to reciprocate between the pins 26 and 27 by means ofa cam lever 31 pivoted at.32 and pivoted at '34 to the cam lever 31. A cam 35 is attached to the; cylinder 12 and cooperates with the roller 33, a spring 36 act- .ing to hold the cam roller 33 on the cam 35.

It-will be evident that as the cam 35 rotates the fork 28 will be moved up and down. The

distance between the pins 26 and 27 is such that when one side of the fork is against the pins 26, as shown in Fig. 1, the projection 30 is out of alinement with the pin 27 and similarly, when the projection 30 is in alinement with the pin 27, the projection 29 is out ofalinem'ent with the pin 26. In the arrangement illustrated the fork 28, which of coursec'an turn around the pivot 34, is held normally in the position shown in Fig. 1 by a spring 37. I

The lower end of the fork 28 has a camshaped projection or toe 39 which is engaged by a roller 40 on one end of a bell crank 41 provided with a spring rod 42 and spring 43 extending through a bearing 44.

.toe 45 on the fork 28 engages with the roller 40 to move the bell crank 41 to the 'positionshown in the drawings, when the;roller 33 drops to the lower part of the cam 35. The spring rod 42- is provided with a notch 46 which may be engaged by a locking plunger 47 controlled by a solenoid 48 which'is operated in the manner to be hereinafter described.

40. rod 42 through the bearing 44.

Now, .if the solenoidshould be operated so that the lunger 47 will be moved up into the notch-46, theroller 40 will be held in the position shown in Fig. -1. As the fork 28 is raised by the cam 35 the roller 40 will provide a fixed abutment which will cause the fork 28 to swing to the left of Fig. 1 and bring the shoulder 30 into alinement with the pin 27, and the further movement of the fork 28 will turn the shaft 24 "to partially rotate the bushings 21 to separate the cylinders.

If before the next.reciprocation ofthe fork 28 the solenoid is made inoperative, so that the plunger 47 drops out of the notch 46, the fork28 will drop to the position shown in Fig. 1, and at itsnext upward movement will be turned to theri'ght on itspivot 34 bythe spring 37-and this will bring-the shoulder '29 in engagement pin 26 and return the shaft 24 to its initial position, and-thus bring the cylinders into printing relation again.

As will be understood by those skilled in rate so as to avoid spoiling the impression surface, and this results in an imperfect impression on the blanket from the form cylinder. I obviate this difficulty by providing a detector at a point remote from the gages 16 and connect this detector with the trip as through the solenoid 48, so that if a sheet has not arrived at the detector the form and blanket cylinders will be separated before the printing surfaces thereon come into contact. Such a detector I have illustrated more or less diagrammatically as comprising a pendulum member 50 contacting with a roller 51, the tapes 17 carrying a sheet between '50 and 51. The member 50 is carried on one end of a bell crank 52 controlled by a cam 53 through a cam' lever 54 and a'connecting rod 55. A battery or other source of. power 56 is connected to the solenoid 48 and also has one terminal connected to the roller 51 and the other to the pendulum member 50. As shown in Fig. 1, the detector is set sufficiently remote from the age 16 so as to give sufficient time for the cylinders to be separated before the printing surfaces come to the contacting point in the event that no sheet is presented between 50 and 51. The cam 53 raises and lowers the member 50 so as to 'break the connection with the solenoid 48 each time after it has been established, and

then such connection is attempted to be restored by the lowering of the member. 50, such connection being prevented if a sheet has in the meantime been presented to-the roller 51.- When the solenoid 48 is energized the plunger 47 is moved upward into the notch 46 as heretofore described.

It will be seen that the detector of my present invention is entirely independent of any. detector which may be used in connection with the gage 16 to separate the form and the blanket cylinders, or indeed entirely independent from any form of tripping mechanism between these two last mentioned cylinders, and such cylinders may be tripped at any time desired to prevent their contact without reference in any way to the sieparation of the blanket and form cyliners.

It will be obvious that many features of my present invention may be applied to any inder, a blanket cylinder and an impression cylinder, a feed gage to position a sheet being fed to the impression cylinder, means to forward a sheet tosaid gage, the printing surfaces on the form and blanket cylinders being constructed and arranged so that they are normally in contact at the time a sheet is taken from said gage by said impression cylinder, tripping means to separate the blanket and the form cylinders, and means, controlled" by the presence. or absence of a; sheet in said sheet-forwarding meansat a point remote from said gage, to actuate said tripping means to separate said cylinders before theprinting surfaces thereon come into contact.

2. In a printing press, a pair of printing cylinders, means to separate said cylinders, a feed gage independent of said cylinders and arranged to position a sheet in relation to said printing cylinders, means to forward a sheet to said gage and means controlling the operation of said cylinder-separating means and adapted to be rendered operative by the absence of a sheet insaid sheet-forwarding means at a point remote from said gage-Z In a printing press,a pair of printing 3. cylinders, a feed gage to position a sheet in relation to said printing cylinders, means to forward a sheetto said gage, the printing surfaces on said cylinders being constructed and arranged so that they are normally in contact at the time a sheetis taken from said gage, tripping means to move said cylinders into and out of'contact, and a detector mechanism arranged to be acted on by a sheet in l the control of-said forwarding means before the sheet reaches'the gage, said'detectorJmechanism and said tripping mechanism being constructed and arranged tomove the cylinders apart before their surfaces contact when no sheet is presented towsaid detector mechanism. v 4. In a printing press, a. pair of printing cylinders, a feed gage to position a sheet in relation to said printing cylinders, means to forward a sheet to said gage, the printing surfaces on said cylinders being constructed and arranged so that they are normally in contact at the time a sheet is taken from said gage, tripping means to move said cylinders into and out of contact, and a detector mechanism arranged to be-"acted on by a sheet in the control of said forwarding means before the sheet reaches the gage, said detector mechanism and said tripping mechanism being constructed and arranged to move the cylindersapart before their surfaces contact when no sheet is presented to said detector mechanism, and to bring the cylinders together before their surfaces contact when a sheet is presented to said detector mechanism. v

5. In a printing press, a pair of printing cylinders and means for moving said cylinders toward and away from each other, c0mprising a reciprocating member adapted to be held in either one of two positions; to trip or to untrip said cylinders, yielding means to hold said member-normally in untripping position, anorma-lly yielding abutment adapted to cause said member to move into tripping position when said abutment is fixed, and means to hold saidabutment in its fixed position.

6. In a prmtmg press, a pair of printing fixed, a detector adapted to be actuated by a sheet being fed to the cylinders and means actuated by said detector when no sheet is presented thereto to hold said abutment in its fixed position.

7 In a printing press, a pair 'ofprinting cylinders and means for moving said cylinders toward and away from each other, comprising a reciprocating member adapted to be held ineither one of'two positions, to

trip or to untrip said cylinders, yielding means to hold said member normally in untripping position, said member having a ,cam thereon, a normally yielding abutment-- cooperating with said cam and adapted to I cause said member to move into tripping position when saidabutment is fixed, and

means to hold said abutment in its fixed/position. l f

8. In aprinting press, a'pair of printing cylinders 'andmeans for moving said cylinders toward and away from each other, comprising a reciprocatin member adapted to beheld in either "one 0 two positions, to trip or to untrip said cylinders,'yielding means to hold said member normally in untripping position, said member having a cam thereon, a normally yielding abutment cooperating with said cam and adapted to cause said member to move into tripping .position when said abutment is fixed, a detector adapted to be actuated by a sheet being fed to the cylinders and means actuated by said detector-when no sheet is presented thereto to hold said abutment in its fixed position.

9. 'In a printing press, a pair of printing cylinders and means for. mov'ingsaid cylinders to and away from eaeh other, comprising areeiprocating m'emberadapted to be held in either one of two positions, to trip or to 'untrip said cylinders, yielding means to hold said member normally in untripping p osition',. a normally yielding abutment tripping position when said abutment 'is fixed, a detent to hold said abutment in its fixed position, a solenoid to control the position of said detent, a pair of terminals connected with said solenoid and adapted to be held apart by a sheet being fed to said cyl- JOSEPH WHITE.

f g inders; adapted to cause said member to move into

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