US2747504A

US2747504A - Registering mechanism for rotary offset printing machines

Info

Publication number: US2747504A
Application number: US349652A
Authority: US
Inventors: James P Fay
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-04-20
Filing date: 1953-04-20
Publication date: 1956-05-29
Anticipated expiration: 1973-05-29

Description

J. PI'FAY May 29, 1956 REGISTERING MECHANISM FOR ROTARY OFFSET PRINTING MACHINES Filed April 20, 1953 w l I w m @N F W P M n a A E N w 9 a N VS Y B w rli wHll mw M IIIIII I11 i N 1! H wl flm mm J am m Q J% N@ L! [I x. & -6 2 R mwRVifik i| S M N; E ML N 3m United States Patent 6 REGISTERMG h IECHANISM FOR ROTARY OFFSET PRINTING MACHINES .lames P. Fay, Nor-walk, Conn.

Application April 20, 1953, Serial No. 349,652

Claims. (Cl. 101-248) The present invention relates to an improved means for obtaining vertical register in an offset printing device and is an improvement on the device shown in my Patent No. 2,536,679 issued January 2, 1951.

In my prior patent an electric motor within the blanket cylinder was disclosed as a means for producing relative movement between the interconnected plate and blanket cylinder and the impression cylinder in order to secure register correction.

it is an object of the present invention to eliminate the use of said electric motor within the blanket cylinder and the attendant slip rings and contacts and controls therefor and to provide a unitary device disposed exteriorly of the cylinders to be readily accessible for quickly adjusting the register in the printing in a simple operation.

This is accomplished according to the present invention by providing in the drive means a gear connected to drive the impression cylinder and a separate gear connected to drive the geared-together plate and blanket cylinders and interconnecting said gears with a manually operated differential mechanism whereby the phase relation of the first and second driving gears may be altered, thus simultaneously altering the relative angular relation between the interconnected blanket and plate cylinders and the impression cylinder.

A feature of the present invention resides in the fact that the differential drive can be mounted exteriorly of the cylinders and when provided with manual control for the differential gear very accurate adjustments of the relative positions between the plate and blanket cylinder and impression cylinder can be obtained during make-up or while the press is running.

The present invention can be built directly into an offset press or can, by a slight modification of an existing press, be incorporated therein.

Other features and advantages of the invention will be apparent from the specification and claims when considered in connection with the drawings in which:

Figure l is a vertical section taken along lines 1-1 of Fig. 2.

Fig. 2 is a section taken along lines 2-2 of Fig. 1.

Fig. 3 is a longitudinal sectional view through the drive shaft and differential mechanism.

Fig. 4 is a sectional view taken along lines 4-4 of Fig. 3.

Asshown in Fig. 1, the plate cylinder is rotatably supported by shaft Illa on the main frame and .is provided with suitable means 11 for securing a printing plate 12 about the periphery thereof. The plate engages a blanket r3 clamped to the periphery of a blanket cylinder 14 by suitable clamping means 15, said cylinder being rotatably supported by shaft 14a on the main frame. The blanket transfers the image from the plate to the paper, not shown, positioned over the surface of the impression cylinder 16 rotatably supported by shaft 16a on the main frame. The paper is fed to the impression cylinder by feed belt 17 and feed rollers 18 and is clamped in position thereon by clamping means 19.

ice

As shown in Figs. 1 and 2 the main drive means includes a drive shaft 20 rotatably mounted in the frame and located in back of the blanket cylinder and having a first gear 21 secured thereto to rotate therewith. This gear connects to a gear 22 pinned to shaft 14a rotatably mounted in the

side plates

24, 25 of the main frame and drives gear 2-5 which is connected to the impression cylinder to rotate the same. A gear 27 is connected to the gear 26 on the impression cylinder to drive the timing mechanism (not shown) for controlling the feeding of the sheets to the impression cylinder. Also mounted on the drive shaft 20 is a second gear 30 which engages a gear 31 fixed to the blanket cylinder and it is drivingly connected to a. gear 32 on the plate cylinder so that these two cylinders are permanently geared together.

The gear 32 is connected to the gear 32a and forms the drive for the usual inking mechanism 23 and dampening mechanism 29. With the inking mechanism thus conected to the plate and blanket cylinders and the paper feed connected to the impression cylinder a drag will be provided on the gearing for these cylinders which will take out back lash therein 50 that any adjustment of the plate and blanket cylinders with respect to the impression cylinder can be accurately obtained.

Normally thefirst and second gears are driven in unison from the shaft so that the plate, blanket and impression cylinders rotate in predetermined relation. Should it be desired to alter the relative position between the plate and blanket cylinder and impression cylinder in order to correct error in vertical register, means are provided for changing the phase relation between

gears

21 and 30 which change in phase relation will cause a displacement of the plate and blanket cylinders with respect to the impression cylinder so that proper register may be obtained.

In order to accomplish this the present invention has provided a differential mechanism, preferably manually controlled, connecting the gear 30 to the shaft 26. In the illustrated form of the invention as shown in detail in Figs. 3 and 4 it will be noted that a housing 33 is provided on the side 25 of the frame and in which an extension of shaft 2% is located. Within the housing a sun gear 34 is secured to a sleeve 35 surrounding the shaft and pinned thereto by pin 36 for rotation therewith. If desired, a handwheel 37 may be provided on the end of the shaft and secured thereto by the pin 36 securing the sleeve to the shaft as shown in Fig. 3. This enables manual operation of the cylinders for the purpose of checking and correcting register. The sun gear engages a set of planet gears 33, herein illustrated as three gears, rotatably mounted on pins 39 carries by a spider 40 rotatable about the shaft. The planet gears engage a ring gear 41 which is normally fixed. The other end of the pins 39 carried by the spider are provided with planet gears 42 which cooperate with a ring gear 43 fixed to the housing and a sun gear 44 secured to a sleeve 45 connected to the gear 30. This train of gearing will normally cause the gear 21 which is secured to the shaft and the gear 39, which is connected to the shaft to the dif ferential mechanism, to rotate in unison.

When it is desired to alter the phase relation between gear 21 and gear 30, ring gear 41 is made adjustable. This is accomplished by securing gear 41 to a plate 46 rotatable on a bushing 47 in the housing and by connecting to the plate a wormwheel 48 which is adapted to be rotated by a worm 49 carried by a shaft 50 mounted within the housing. The shaft can be rotated by any suitable means as, for example, by a handwheel 51 or the like operator on the outside of the housing.

Thus it will be seen that by rotating .the handwheel 51 the normally fixed ring gear 41 may be shifted to produce a gain or loss on the planet gear which will alter the drive to the sun gear 44 connected to the gear 30 and vary its phase relationship with respect to gear 21. This will change the relative angular relation between the interconnected plate and blanket cylinders and the impression cylinder and thus efiiect proper register of the printing.

The device of; the present invention can be actuated while the machine is in operation or while the machine is being made ready and, if desired, the handwheel 51 may be graduated to show increments of relative change between the plate and blanket cylinders and the impression cylinder so that accurate corrections can be made.

It will be seen that the foregoing invention provides a device which is relatively simple to construct and operate and which accuratelyproduces correction for improper vertical register inthe press. 7

Variations and modifications may be made within the scope of the claims and portions of the improvements may be used without others. a

I claim:

1. In an offset printing press, a plate cylinder and blanket cylinder geared together at one end of the cylinder 1 for simultaneous rotation; an impression cylinder cooperating with the'blanket cylinder and having a driving gear at the other end of the cylinder and means for feed ing paper to the impression cylinder in timed relation to the rotation of the impression cylinder, the combination of a drive shaft having a first gear secured thereto adjacent one end of the cylinders and connected to the gear of the impression cylinder to drive the same; a second gear mounted on the shaft for relative rotation with respect to said shaft, said second gear being located adjacent the other end of the cylinders and connected to the gearing connecting the plate and blanket cylinders to drive said plate and blanket cylinders; and means for adjustably connecting said second gear to said shaft and normally operative to rotate said second gear in phase with said first gear to drive said plate, blanket and impression cylinders in unison, said means including a differential mecha nism having a manually rotated adjustable gear to alter the phase relation between said first and second gears to simultaneously alter the relative angular relation between said interconnected blanket and plate cylinders and the impression cylinder.

2. In an ofiset printing press, a plate cylinder and blanket cylinder geared together at one end of the cylinder for simultaneous rotation; an impression cylinder cooperating with the blanket cylinder and having a driving gear at the other end of the cylinder and means for feeding paper to the impression cylinder in timed relation to the rotation of the impression cylinder, the combination of a drive shaft having a first gear secured thereto adjacent one end of the cylinders and connected to the gear of the I impression cylinder to drive the same; a second gear mountedon the shaft for relative rotation with respect to said shaft, said second gear being located adjacent the other end of the cylinders and drivingly connected to the gearing connecting the plate and blanket cylinders to drive said plate and blanket cylinders; and means for adjustably connecting said second gear to said shaft and normally operative to rotate said second gear in phase with said first gear to drive said plate, blanket and impression cylinders in unison, said means including a difierential mechanism comprising a gear fixed to the shaft to be driven thereby, rotation transmitting gears connecting said gear to the second gear, and manually rotatable adjustable means for controlling the rotation transmitting gears to alter the phase relation between said first and second gears to simultaneously alter the relative angular relation between said interconnected blanket and plate cylinders and the impression cylinder.

3. In an offset printing press, a plate cylinder and blanket cylinder geared together at one end of the cylinder for simultaneous rotation; an impression cylinder cooperating with the blanket cylinder and having a driving gear at the other end of the cylinder and means for feeding paper to the impression cylinder in timed relation am'moe to the rotation of the impression cylinder, the combination of a drive shaft having a first gear secured thereto adjacent one end of the cylinders and drivingly connected to the gear of the impression cylinder to drive the same; a second gear mounted on the shaft for relative rotation with respect to said shaft, said second gear being located adjacent the other end of the cylinders and drivingly connected to thegearing connecting the plate and blanket cylinders to drive said plate and blanket cylinders; and means for adjustably connecting said second gear to said shaft and normally operative to rotate said second gear in phase with said first gear to drive said plate, blanket and impression cylinders in unison, said means including a differential mechanism-comprising a sun gear fixed to the shaft to be driven thereby, a sun gear connected to the second gear to drive the same, rotation transmitting gears connecting said sun gears including connected planet gears carried by a spider and relatively fixed ring gears engaging the planet gears, and manually adjustable means engaging and shifting the relative positions of said ring gears to alter the phase relation between said first and second gears to simultaneously alter the relative angular relation between said interconnected blanket and plate cylinders and the impression cylinder.

4. In an ofiset printing press, a plate cylinder and blanket cylinder geared together at one of the cylinder for simultaneous rotation; an impression cylinder coopcrating with the blanket cylinder and having a driving gear at the other end of the cylinder and means for feeding paper to the impression cylinderin timed relation to.

, one end of the cylinders and connected to the gear of the impression cylinder to drive the same; a second gear mounted on the shaft for relative rotation with respect to said shaft, said second gear being located adjacent the other end of the cylinders and connected to the gearing connecting the plate and blanket cylinders to drive said plate and blanket cylinders; and means for adjustably connecting said second gear to said shaft and normally operative to rotate said second gear in phase with said first gear to drive said plate, blanket and impression cylinders in unison, said means including a differential mecha- 7 phase relation between the sun gears and said first and second gears to simultaneously alter the relative angular relation between said interconnected blanket and plate cylinders and the impression cylinder.

5. In an offset printing press, a plate cylinder and blanket cylinder geared together at one end of the cylinder for simultaneous rotation; an impression cylinder cooperating with the blanket cylinder and having a driving gear at the other end of the cylinder and means for feeding paper to the impression cylinder in timed relation to the rotation of the impression cylinder, the combination of a drive shaft having a first gear secured thereto adjacent one end of the cylinders'and connected to the gear of the impression cylinder to drive the same; a second gear mounted on the shaft for relative rotation with respect to said shaft, said second gear being located adjacent the other end of the cylinders and connected to the gearing connecting the plate and blanket cylinders to drive said plate and blanket cylinders; and means for adjustably connecting said second gear to said shaft and normally 5 6 and Wormwheel connected thereto, said worm being man- References Cited in the file of this patent ually actuated and adjustable to shift the connected ring gear and alter the phase relation between said first and UNITED STATES PATENTS second gears to simultaneously alter the relative angular 1:027:384 Green May 1912 relation between said interconnected blanket and plate 5 28 Greenwood Feb. 4, 1936 cylinders and the impression cylinder. 2,536,679 Fay Jan. 2, 1951