US1683243A

US1683243A - Printing-press ductor mechanism

Info

Publication number: US1683243A
Application number: US171510A
Authority: US
Inventors: Joseph R Blaine
Original assignee: Miehle Printing Press and Manufacturing Co
Current assignee: Miehle Printing Press and Manufacturing Co
Priority date: 1927-02-28
Filing date: 1927-02-28
Publication date: 1928-09-04
Anticipated expiration: 1945-09-04

Description

Sept. 4, 1928. 1,683,243

J. R. BLAINE PRINTING PRESS DUCTOR MECHANISM Filed Feb. 28, 1927 2 Sheets-SheetI l 4 Illnmlulnmm* J' 1 Isig fi'r I "mi llllLlLv 54 l I u a l l f`1 j] f 'Y im Sept. 4, 1928. 1,683,243

J. R. BLAINE PRINTING PRESS DUCTOR MECHANISM Filed Feb. 28, 1927 2 Sheets-Sheet 2 53 illumimum Patented Sept. 4, 1928.

UNITED STATES PATENT OFFICE.

JOSEPH B. BLAINE, OF OAKl PARK, ILLINOIS, ASSIGNOR TO THE MIEHLE PRINTING PRESS & MANUFACTURING COMPANY, OFCHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PRINTING-PRESS DUCTOR MECHAN ISM.

Application led February 28, 1927.- Serial No. 171,510.

The present invention relates to improvements in lithographie dampening mechanisms, particularly adapted for use in connection with lithographie cylinder presses.

In the use of lithographie presses in general, it is customary to apply a thin ilm of water to the surface of the plate which earries the sub'ect from which an impression is to be pulle l In order to accomplish this, a 'series of dampening rollers are used, comprising a fountain roller from which a small quantity of water is conveyed by means of an -oscillating ductor roller to a set of distributing rollers, whereby the required volume of water is applied to the plate of the press. t

In order to successfully meet differentconditions which present themselves 1n lithographic printing, and 'to thereby attain the desired results, it is essential that the volume ofwater that is to be applied to the plate of the press be correspondingly varied.

In connection with most mechanisms resorted to in the past for the purpose of accomplishing this, however, it has been found that such mechanisms had not proven strictly practical, inasmuchI as the respective parts, whereby the adjustment had to be effected, were not readily accessible to the operator, and furthermore did not permit of an absolutely positive adjustment of the cooperating parts.

The principal object of this invention, therefore, is to provide an improved lithographie dampening mechanism including novel means whereby the movement of the ductor roller can be conveniently and positively timed so as to vary its time of contact with the fountain roller and to thereby cor respondingly vary the volume of water supplied to such plate.

Other objects of the invention will be apparent from the specification and accompany"- ing drawings in which:

Figure 1 is a side elevation of the'combined mechanism, showing the relative position of the parts when the ductor roller is in Contact with the fountain roller;

Figure 2 is a partial plan view with some of the parts omitted in order to more clearly illustrate the principal elements of the mechanism;

Figure 3 is a similar View to that shown in Figure 1, but showing the respective parts 'j scribed. The operating in their position when the ductor roller is tripped; y

Figure 4 shows an assembly of the ductor roller cam adjusting means;

Figure 5 is a detail of the device shown in Figure 4, illustrating the relative position of the helical slots for adjusting the cams.

As illustrated on the drawings, 1 represents the plate cylinder of a lithographie press; 2 denotes one of the side frames of the water fountain wherein the fountain roller 3 is mounted tol rotate, and from which roller water is transferred to water distributing mechanism by means of the ductor roller 4 carried by the oscillating arm or bracket 5. The latter is pivotally supported on the shaft 6, and is imparted its oscillatory movement by means of the operating arm 7, as will be hereinafter described. The arm 7 is provided at its free end with a substantially horizontal` slot 8, which receives an excenter 9 adapted to move longitudinally therein. The excenter `9 is formed on a stud which is pivotally mounted in the free end of one arm of the bell crank lever 11, and has secured thereto a manuall operated lever 10 whereby the ductor rol er can be. tripped, as will be deever 11 is pivotally mounted to the machine frame as indicated at 13, and carries at its lower extremity a cam roller 12, which operatively engages the

cam disks

14 and 15 for the purpose of oscillating the ductork roller 4.

In order to vary the time of contact of the ductor roller 4 with the fountain rollei` 3, so as to correspondingly vary the volume of water that is to be supplied to the subject plate of the cylinder l, the cams 14 and] 15 can be adjusted relatively to each other so as to increase ordecrease the operative cam surface which engages the cam roller 12 on the. lever 11.

The mechanism whereby the relative adjustment of the

cams

14 and 15 is accomplished comprises a. threaded shaft 16 to which is pinned or otherwise secured, a lian-y dle 17,` preferably located at the side of the press so as to bc readily accessible to the operator. The shaft 16 also supports a sleeve 18 which carries a bolt or stud 19 arranged so as to operatively engage within the helical slots 22 and formed in the'liubs 120 and 21 of the

cams

14 and 15, respectively, as shown vided with .a hub portion 24 onto which is keyed the sleeve 26 which supports the drivf ing sprocket 25. The threaded shaft 16 screws into the outer end of the supporting shaft 27 which is secured to the press frame. The hub 20 of the cam 14 is loosely mounted so as to be capable of adjustment about the hub 21 ofthe cam 15. The

cams

14 and 15 are held in position by means of a collar 28 driven onto or otherwise secured to the end ofthe shaft 27. It will readily be understood with reference to Figures 1, 4 and 5 that, if

for example, the handle 17 is rotated in an anti-clockwise direction, the sleeve 18 with its stud 19 will slide outwardly on the hub 20 and away from the cam 14. Inasmuch as the cam 15 is positively driven by the sprocket 25 and therefore -cannot be rotated when the press is at a standstill, the stud 19 will follow the slot 23 formed in the hub 21 of the cam 15, while the cam 14 will be caused to rotate in an anti-clockwise direction, owing to the engagement of the stud 19 with the helical slot 22 formed in the lub 20 of the cam `14. This will correspondin ly change the timing of the ductor roller 4 inasmuch as it will increase the time of contact of the cam roller 12 with the high arts of cams 14 vand 15 and consequently t e time of Contact of the ductor roller 4 with the fountain roller 3 will be correspondingly decreased. By moving the hand e 17 in a clockwise direction,l the cams 14 and 15 'will be moved together so that the contact surface of the high parts of said cams will be decreased and the time of contact of the ductor roller 4 with the fountain roller 3 will be correspondingly increased.

The cam roller 12 is held in constant engagement with the

cams

14 and 15 by means of an expansion coil spring 29 mounted on theI rod 30, the outer end of which rod is slidably -mounted in a bracket not shown, while the other end of the rod is pivoted at 31 to the operating lever 11. The tension spring 29 can be adjusted b means of the locknuts 32.

In order to ren er the ductor roller 4 inoperative so as to interrupt the supply of water from the fountain roller 3 to the subject plate of the plate cylinder, tripping means is provided which comprises a tripping lever 10 pivotally mounted on the end of one of the arms of the operating lever 11. The pivot of the tripping lever 10 is formed with an excentric portion 9 which slidably operates within the slot 8 formed in the lever 7. When the lever 10 is thrown over to the positionshown in Figure 3, the excenter will move the lever 7 downwardly sufficient to move the ductor roller` 4 out of engagement with the fountain roller 3, as indicated in Figure 3, so that during the continuance of the oscillating movement of the lever 11, the roller 4 willl he prevented`l from contacting with the fountain roller 3.`

Preferably the leveror bracket 5 is mountthereon a similar abutment 39. An expansion coil spring 41 is placed between the said two abutments and is held in position by means of a pin 37 which passes through bores provided in the

abutments

38 and 39, so that it can freely slide therein. The pin 37 is held in position by a cotter pin or by any other suitable means.

It will be apparent that when the roller 4 contacts with the vibrating roller 50, as indicated in dotted lines in Figure 1, before the downward movement of the lever 7 is completed, then the spring 41 will yield so that there will not be any excessive pressure exertedV between the roller 4 and the roller 50 during the continued downward movement of the lever 7.

The lever or bracket 5 is also formed with an abutment 36 which carries an adjusting screw 34 with its set screw 33. The free end of the adjusting screw 34 abuts against a stop 35 formed integral with the bracket 40. In-

asmuch as the bracket 40 is rigidly secured to Y the shaft 6, the stop 35 will engage the adjusting screw 34 during the upward movement of the lever 7, and move the bracket 5 upwardly to bring the roller 4 into contact with the fountain roller 3.v The degree of contact between the ductor roller 4 and the fountain roller 3 can be readily .varied by means of the adjusting screw 34 and locknut In order to securely hold the trip lever 10 in its two operative positions against the stops 51,` such as indicated in Figures 1 and'3, the stops 51 are provided with small leaf springs 52, arranged so that the lever 1() is frictionally engaged and held in position thereby.

,The water fountain, together with its cooperating vibrating roller 50 and distributing rollers 48 and 49, can be moved` as a. unit, a variable distance, towards and away from the plate cylinder 1 without, however, interrupting its operation. The mechanism whereby this is accomplished comprises an arm 42, theouter end of which is secured to a pivoted, manually operated lever not slown, while the other end of` said arm is pivotedi to .a bell crank lever 43 as shown on Figures 1 and 3. The free` end of the arm 45 of said f bell crank lever, which latter is pivotally When t-he arm 42 is drawn to the left as viewed in Figures 1 and 3, the kbell crank lever 43 will be moved in a clockwise-direction, and the engagement of the stud 46 with the Wall of the slot or recess 47 will cause the fountain to move as a unit to the right, that is, out of operative engagement with the plate cylinden 1.

During the movement of the fountain mechanism as a unit away from the plate cylinder, the excentric portion 9 of the trip lever pivot will slide in the slot 8 of the arm 7. Inasmuch as it is necessar to thoroughly saturate the distributing rol ers with water prior to the commencement of the actual printing operation of a lithographie press, i. e., before the said rollers are brought into contact with the plate of the press, it will be understood that the ductor roller must be adapted to operate effectively, also when the fountain mechanism is in its removed or tripped position.

Therefore, in order that the movement of the fountain as a unit away from the plate cylinder does not appreciably affect the throw of the ductor during the latters operation when the fountain is tripped, it is essential that said slot be in a substantially horizontal position when the ductor roller 4 is in contact with the fountain roller 3, as indicated in Figure 1.

It will be readily understood that various modifications may be embodied in the construction of the mechanism described and illustrated with reference to the accompanying drawings without, however, departing from the spirit of the invention; therefore. I intend to cover all such modifications that will come within the scope of the appended claims.

I claim as my invention:

1. In lithographie printing press dampening mechanism, the combination of a water fountain, a fountain roller, water distributing means, a ductor roller intermittently engaging said fountain roller and said distributing means for conveying water from the former to the latter, means for timing the operation of said ductor roller to vary its time of contact with said fountain roller and the amount of water conveyed therefrom, and means for adjusting the water fountain as a unit a variable distance towards and away from the printing plate of the press.

2. In lithographie printing press dampen- .ing mechanism, the combination of a water fountain, a fountain roller, water distributing means, a ductor roller intermittent-ly engaging said fountain roller and said distributing means for conveying water from the former to the latter, means for timing the operation of said ductor roller to vary its time of contact with said fountain roller and the amount of water conveyed therefrom, and means for tripping said ductor roller to render it inoperative, without interrupting its intermittent movement.

3. In lithographie printing press dampen ing mechanism, the combination of a water fountain, a fountain roller, water distributing means, a ductor roller intermittently engaging said fountainroller and said distributing means for conveyin water from the former to the latter, means for timing the operation of said ductor roller to vary its time of contact with said fountain roller and the amount of Water conveyed therefrom, and means for adjusting the water fountain as a unit substantially horizontally and a variable distance towards and away from the printing plate of the press.

4. In lithographie printing press dampening mechanism, the combination of a water fountain, a fountain roller, water distributing means, a ductor roller intermittently engaging said fountain roller and said distributing means for conveying water from the former to the latter, means for timing the operation of said ductor roller to vary its time of contact with said fountain roller and the amount of Water conveyed therefrom, means for adjusting the water fountain as a unit towards and awa from the printing plate of the press, an means for tripping said ductor roller to render it inoperative, 9

without interrupting its intermittent movement.

5. In lithographie printing press dampening mechanism, the combination of a water fountain, a fountain roller, water distributing means, a ductor roller intermittently engaging said fountain roller and said distributing means for conveying Water from the former to the latter, means for timing the operation of said ductor roller to vary its time of contact with said fountain roller and the amount of water conveyed therefrom, and means for tripping said ductor roller to prevent it from moving into contact with said fountain roller, Without interrupting its intermittent movement.

6. In lithographie printing press dampening mechanism, the combination of a water fountain, a fountain roller, water distributing means, a ductor roller intermittently engaging said fountain roller and said distributlng means for conveying water from the former to the latter, cam means for timing the operation of said ductor roller to vary its time of contact with said fountain roller and the amount of water conveyed4 therefrom, and manually operated means for tripping said ductor roller to prevent it from moving into contact with said fountain'roller,

without interrupting its intermittent movel ment.

7. In lithographie printing press dampening mechanism, the combination of a water fountain, a fountain roller mounted therein, water distributing means, a. ductor roller intermittently engaging said fountain roller and said distributing means for conveying water from the formei; to the latter, manually adjustable means for timing the operation of said duetor roller to vary its time of contact with said fountain roller and the amount of Water conveyed therefrom, and means for adjusting the water fountain as a unit a variable distance towards and away from the printing plate of the press.

8. In lithographie printing press dampening mechanism, the combination of a water fountain, a fountain iollcr mounted therein, Water distributing means, a duetor roller intermittently engaging said fountain roller and said distributing means for conveying' water from the former to the latter, manually adjustable cam means for timing the operation of said duetor roller to vary its time of contact with said fountain roller and the amount of water conveyed therefrom, and manually operative means for adjusting the Water fountain and associated parts as a unit a variable distance and substantially hori- Zontally towards and away from the printing plate of the press. Y

9. In lithographie printing press dampening mechanism, the combination of a water fountain, a fountain roller mounted therein, water distributing means, a duetor roller intermittently engaging said fountain roller and said distributing means for `conveying Water from the former to the latter, manually adjustable cam means for timing the operation of said duetor roller to vary its time of contact With said fountain roller and the amount of Water conveyed therefrom, and means for tripping said duetor roller to render it inoperative Without interrupting its intermittent movement.

10. In lithographie printing press dampening mechanism, the combination of a Water fountain, a fountain roller mounted therein, Water distributing means, a duetor roller intermittently engaging said fountain roller and said distributing means for conveying Water from the formeL to the latter, manually adjustable, relatively movable cams for timing said duetor roller to vary its time of contact With said fountain roller and the amount of Water conveyed therefrom, each of said cams having a. hub with a helical slot formed therein, said slots extending in opposite directions relative to each other, means engaging said slots and operable to elfect relative adjustment of said cams, and means for tripping said duetor roller to render it inoperative.

11. In lithographie printing press dampening mechanism, the combination of a Water fountain, a fountain roller mounted therein, water distributing means, a duetor roller intermittentl engaging said fountain roller and said distributing means for conveying water from the former to the latter, manually adjustable, relatively movable cams for timing said duetor roller to vary its time of contact with said fountain roller and the amount of Water conveyed therefrom earch of said cams having a hub with a helical slot formed therein, said slots extending in opposite directions relative to each other, means engaging said slots and operable to effect relative adjustment of said cams, means for moving said fountain mechanism as a unit, and means for tripping said duetor roller to render it inoperative.

12. In combination with printing press fountain mechanism, a fountain roller, a duetor roller intermittently engaging said fountain roller, means for timing the intermittent movement of said duetor roller to vary its time of contact with said fountain roller and the amount of substance conveyed therefrom, and means for tripping the duetor roller to render it inoperative without interrupting its intermittent movement.

13. In combination With printing press fountain mechanism, a fountain roller, a duetor roller intermittently engaging said fountain roller, manually adjustable' means for timing the intermittent movement of said duetor roller to vary its time of contact With said fountain roller and the amount of substance conveyed therefrom, and means for tripping said duetor roller to render it inoperative Without interrupting its intermittent movement.

14. In combination with printing press fountain mechanism, a fountain roller, a resiliently mounted duetor roller intermittently engaging said fountain roller, manually adjustable cam means for timing the intermittent movement of said duetor roller to vary/)its time of contact with said fountain rollery and the amount of substance conveyed therefrom, and means for tripping said duetor roller to prevent its contact with said fountain roller Without interrupting its intermittent movement.

15. In combination with printing press fountain mechanism, a fountain roller, a resiliently mounted duetor roller intermittently engaging said fountain roller, a pair of relatively adjustable cams for timing the intermittent movement of the duetor roller to vary its time of contact with said fountain roller and the amount of substance conveyed therefrom, and means, comprising a manually operated lever, for tripping said duetor roller to render it inoperative without interrupting its intermittent movement.

16. In combination with printing press fountain mechanism, a fountain roller, a Iresiliently mounted duetor .roller intermittently engaging said fountain roller, a pair of relatively adjustable cams for timing Vthe intermittent movement of the duetor roller to vary its time of contact with said fountain roller and the amount of substance conveyed therefrom, and means comprising an excentric and a member for actuating said eXcentric for the purpose of tripping said ductor roller to prevent its Contact with said fountain roller without interrupting the intermittent movement of said ductor roller.

17. In printing press fountain mechanism, the combination of a fountain roller, a ductor roller intermittently engaging said fountain roller, adjustable means for timing the intermittent movement of said ductor roller, means for( moving said fountain mechanism as a unit substantially horizontally'and a variable distance towards and away from the printing plate of the press without interrupting its operation, and' means whereby the throw of said ductor roller will not be appreciably affected when said fountain mec anism is moved.

18. In printing press fountain mechanism, the combination of a fountain roller, a ductor roller intermittently engaging said fountain roller, means for timing the intermittent movement of said ductor roller, means for moving said fountain mechanism as a unit, means whereby the throw of said ductor roller will not be appreciably affected when said fountain mechanism is moved and comprising cam operated means to effect the intermittent movement of said ductor roller, a rock arm having formed therein a substantially horizontal slot, and a stud provided on said cam operated means and operatively engaging said slot.

19. In printing press fountain mechanism, the combination of a fountain roller, a ductor roller intermittently engaging said fountain roller, means for timing the intermittent movement of said ductorroller, means for tripping said ductor roller to render it inoperative, means for moving said fountain mechanism as a unit, means whereby the throw of said ductor roller will not be appreciably affected when said fountain mechanism is moved and comprising cam operated means to effect the intermittent movement of said ductorr roller, a rock arm having formed therein a substantially horizontal slot, and a stud provided on said camV operated means and o eratively engaging said slot.

2 0. n a printing press fountain mechanism, the combination of a fountain roller, a ductor roller intermittently engaging said fountain roller, means for timing the intermittent movement of said ductor roller, means for moving said fountain mechanism as a unit, means whereby the throw of said ductor roller will not be appreciably affected when said fountain mechanism is moved, and comprising cam operated means to effect the intermittent movement of said ductor roller, a rock arm having formed therein a slot which extends in a direction parallel to the direction of movement of said fountain mechanism, and a stud provided on said 'cam operated means and operatively engaging said slot.

21. In a printing press fountain mechanism. the combination of a fountain roller, a ductor roller intermittently engaging said fountain roller, means for timing the intermittent movement of said ductor roller, means for tripping said ductor roller to render it inoperative. means for moving said fountain mechanism as a unit, means whereby the throw of said ductor roller will not be appreciably affected when said fountain mechanism is moved and comprising cam operated means to effect the intermittent movement of said ductor roller. a rock arm having formed therein a slot which extends in a direction parallel to the direction of movement of said fountain mechanism. and a stud provided on said Cam operated means and operatively engaging said slot.

22. In a lithographie printing press. the combination of a fountain mechanism. a fountain roller supported thereby. a ductor roller intermittently engaging said fountain roller, means for varying the intermittent Vmovement of said ductor roller to vary its time of contact with said fountain roller, means for tripping said ductor roller to prevent its contact with said fountain roller without interrupting its intermittent movement, and means for variably moving the fountain mechanism as a unit towards1 and away from the printing plate of the press.

Signed at Chicago, Illinois, this 25th day of February, 1927.

JOSEPH Rf BLAINE.