US664100A

US664100A - Bed-motion for cylinder printing-machines.

Info

Publication number: US664100A
Application number: US49715394A
Authority: US
Inventors: Walter Scott
Original assignee: Individual
Current assignee: Individual
Priority date: 1894-01-17
Filing date: 1894-01-17
Publication date: 1900-12-18
Anticipated expiration: 1917-12-18

Description

Patented Dec. I8, |900.

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BED MOTION FDR CYLINDER PBINTINGMA'GHINES.

(Application mea un. 17, 1894.) I l 3 Sheets-Sheet l.

(Alle Model.)

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No. 664,IOU. Patnt'ed Dec. I8, |900. W. SCOTT.

BD MOTION FUR CYLINDER PRINTING MACHINES.

(Applicatin Bled Jan. 17, 1894.) (No Model.) 3 Sheets-Sheet 2,

'Ma/KW', I *@M/ No. 664,I00. Patented Dec. I8, I900.

, w. scoTT.- BED MDTION FOR CYLINDER PRINTING MACHINES. (Application led Jan. 17, 1894,] (No Model.) 3 Sheets-Sheet 3.

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UNITED STATES Fries.

EARN

WALTER SCOTT, OF PLAINFIELD, NEW JERSEY.

SPECIFICATION forming part of Letters Patent No. 664,100, dated December 18, 1900.

`Application filed January 17, 1894. Serial No. 497,153. (No model.)

1'0 LZZ whom t may concern:

Be it known that I, WALTER SCOTT, a citi- Zen of the United States, and a resident of Plainfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Bed-Motions for Oylinder Printing-Machines, of which the following is a specification.

This invention relates primarily to the means for giving a reciprocating motion to the beds of cylinder printing-machines. There are several classes of such machines, and the invention is applicable to all of them. One such class includes continuously-revolving cylinders which are lifted during the return or non-printing stroke of the bed or which have a depressed part which is opposite the bed during such return stroke. Another class of these machines includes a cylinder which is at rest during the return stroke of the bed and which is driven in unison with the bed during the forward or printing stroke inder is an oscillating one, being usuallydriven by a rack on the bed. Such cylinder may take impressions in a variety of Ways, as during one stroke of the bed and not during the other, being raised from the impressing position during thev return stroke, or it may take impressions during both strokes. Again, there is a class wherein there are two or more impression-cylinders for one bed, which coact therewith in ways well known to makers and users of machines of this class. In all these classes the aim is to secure an eX- act equality of speed of the printing and the impression-surfaces, coupled with a quick reversal of the motion of the bed and smoothness of motion of all parts. The object of this invention is to secure all these ends.

This invention is an improvement upon a movement heretofore patented, which patented movement consists generally of a reciprocating bed, a rack thereon, a rack-driving pinion on a shaft carrying a second pinion, a pivoted frame carrying said shaft, and a driving-gear with which said second pinion meshes. Certain defects are inherent in this construction, and it is the object of this invention to overcome or avoid these. These defects are the unequal speeds at which the rack-driving pinion passes the ends of the rack and the variations of the power required at the same places. These defects appear to be due to a lack of flexibility in the mechanism of the movement, as at one end of' the rack the second pinion revolves about the driver-gear in the direction of its oWn rotation, taken at the point where the two mesh, while at the other end of t-he rack the contrary is the ease, so that it may be said that vthe contrivance works with itself at one end and against itself at the other end of the movement of the reciprocating bed. According to the present invention the proper flexibility is secured in a mechanism of this nature by introducing suitable gearing between the driving-gear and the second pinion. An auxiliary device may be used to regulate the speed of the frame when the driving-pinion passes the ends of the rack in either case; but it does not Wholly remedy the defects named as inherent in the first or prior construction.

The preferred form of this invention is shown in the accompanying drawings, forming part of this specification, wherein- Figure l is a vertical longitudinal sectional view on the plane indicated by the line l l in Fig. 2 of a machine embodying the invention. Figs. 12L and 1b are views showing other portions of the rack-driving mechanism than that shown in Fig. 1. Fig. 2 is a horizontal longitudinal sectional view on the plane indicated in Fig. 1 by the line 2 2, and Fig. 3 is a cross-sectional view on the plane indicated by line 3 3 in Fig. 2.

The reference A marks a suitable framework in which are mounted the various elements of the machine. A reciprocating member T (as the type-bed of a printing-press) is provided with a rack 2, with which the rackdriving pinion 3 coacts to drive the said member. The pinion 3 is carried in a suitable movable frame F, (shown as pivoted on the axis 4, which is journaled in frame A,) so that it may pass around the ends of the rack 2 and engage either side thereof. A second pinion 5 is rigid with the pinion 3, so as to move therewith. This rigidity may be secured in any suitable way, as by that shown, wherein pinions 3 5 are fast on a shaft 6, which is jonrnaled in the frame F. The said frame F is journaled on the axis or shaft 4, which cai'- ries the main driving-piniou 7 and carries a pinion 8 on a stud or shaft 9, the said pinion 8 being in mesh with pinions 5 7. The shaft 4 is driven in any suitable way, as by a belt for the fast and loose pulleys 10 11. If so desired, a weight 12 maybe used to counterbalance the weight of frame Fand the parts carried thereby. As the end teeth of rack 2 are subject to greater wear than the others I prefer to have them in the form of a loose ferrule 13, held on a pin or stud 14, as in Letters Patent granted to Charles F. Owen, dated the 1st day of May, 1383, and numbered 276,621. In addition to this rotative feature these teeth are preferably made larger .than the other teeth of the rack, and the teeth of the pinion 3, between which they enter, are correspondinglyseparated, as at l5. Certain of the teeth of the rack intermediate the ends are made large, as at 16, to fit the kerfs 15. At each end of the rack is a curved or circular guide 17 to receive and guide one or the other of pins 18 on the said face of pinion 3. By using that pin 1S nearest the end of the rack as pinion 3 turns the end the size of the guide therefor is greatly reduced and greater steadiness of the reciprocating member T obtained. The stops 19 limit the motion of the frame F in both directions. It is well known that the number of pins 18 on the pinion 3 depends on the number of turns of that pinion to a complete reciprocation of the bed. Thus where the number of turns is odd there is but one such pin 18 required, while if said number be even two are required. In the instance shown in the drawings the number of such turns is four; but this invention is in no wise limited to either odd or even turns of said pinion 3.

The reference C marks an impression-cylinder, which may be driven from the shaft 4 by gears a b c or in any other usual way. On this cylinder is fixed a closed (or other) cam 20 to operate the roller 22 on rod or link 21, which rod is pivotallyconnected with the frame F, as by shaft 9. The cam 2O is shaped to operate the rod and frame at the times the pinion 3 turns the ends of rack 2. This construction limits and regulates the motion of frame F. The pins 9 are not required in case the cam 2O is used.

The reciprocating motion of the bed T may be checked by any usual means. There is shown an air-cushion for this purpose. On the bed T is fixed the two air-cylinders 23. These may be in the form of one tube or aircylinder having a central diaphragm or septum 24. On the framework at each end are fixed the pistons 25 for coaction with the tubes or air-cylinders 23, which pistons are -or may be adjustable to cause greater or less cushionings and may be provided with suitable valves or small openings. As shown in the drawings, these pistons are guided by the rods 26, which are fixed to the framing A and are moved by the rods 27. These rods 27 have screw-threads 28 thereon, which engage like threads in the sleeves 29, which are mounted to turn but not to slide in the frame A. 'lhe sleeves 29 have pinions 30 thereon, which engage or mesh with the pinions 3l, sleeved on the rod 26 and in the frame A to turn but not to slide, and by which they are operated. Suitable handles 32 are provided, whereby the pinions 31 are turned to operate the other parts and move the pistons 25 on rods 26 to regulate the cushioning effect. A suitable shield 33, attached at each end to the frame A, is placed over the path of the air-cylinders 23 to prevent anything from falling across their mouths or on the pistons and so cause accidents. Of course the positions of the pistons 25 and air-cylinders 23 maybe reversed, in which case the latter becomes the adjustable element of the air-cushion device.

The bed-motion mechanism is as applicable to other machines wherein there is a reciprocating member as in planers.

This invention is not limited to the precise form thereof hereinbefore described and shown, for many changes in details and arrangement of parts may be made Without departing from the spirit thereof.

Having thus fully described my invention, what l claim is- 1. The combination of a reciprocatory bed or member, a straight rack fast thereto, a swinging frame or member, a driving-pinion having the same axis of motion as said swing-4 ing frame or member, a rack-driving gear journaled on said swinging frame or member and operatively connected With said drivingpinion, and mechanism for regulating the movement of the swinging frame or member as the rack-driving gear passes the ends of the rack, substantially as described.

2. The combination of a reciprocatory bed or member, a straight rack rigid and moving with said bed, a swinging frame or member, a driving-pinion having the same axis of motion as said frame, a rack-driving gear fast on a shaft journaled in said frame, connections between said shaft and said drivingpinion, and mechanism for regulating the movement of the frame as the rack-driving gear passes the ends of the rack, substantially as described.

3. The combination of a reciprocatory bed or member, a swinging frame or member, a driving-pinion having the same axis of motion as said frame, a rack-driving gear journaled on said swinging frame or member and .operatively connected with said driving-pinion, a straight rack rigid and moving with said bed and with opposite sides of the teeth of which said rack-driving gear is adapted to engage to move the bed in opposite directions, and mechanism for regulating the movement of the swinging frame as the rackdriving gear passes around the ends of the rack, substantially as described.

IIO

4. The combination of a reciprocatory bed or member, a swinging frame or member, a driving-pinion having the same axis of motion as said frame, a rack-driving gear fast on a shaft journaled in said swingingl frame, connections between said shaft and said driving-pinion, a straight rack rigid and moving with said bed and with opposite sides of the teeth of which said raekdriving gear is adapted to engage to move the bed in opposite directions, and mechanism for regulating the movement of said swinging frame as the rack-driving gear passes around the ends of the rack, substantially as` described.

5. In a printing-press, the combination of a reciprocatory bed, a progressively rotating or revolving impression-cylinder, a rack connected wi'th said bed, a drive-gear meshing with said rack,.a swinging frame on which said gear is journaled, adrive-pinion having the saine axis of motion as said frame, gearing intermediate said pinion and said gear for driving the latter, a cam connected with said cylinder, and connection between said cam and said frame for moving or controlling the frame as the driver-gear thereonA passes the ends of said rack, substantially as described.

6. The combination of a reciprocatory bed or member, a rack thereon, a rack-driving gear, a movable frame for supporting said gear, a driver-pinion on the fixed framework of the machine, connections between said driver-pinion and said rack-driving gear, a cam, and connections between the cam and movable frame for controlling the movement of the movable frame as the driving-gear passes the ends of the rack, substantially as described.

7. The combination of bed T, rack 2 thereon, pinion or gear 3 for coaction with rack 2, pinion 5 fast on the shaft of gear 8, a drivepinion 7 on a shaft yin the fixed framework of the machine, a frame F pivoted on the same axis of motion as pinion 7, toothed gearing between pinion 7 and gear 5, a cam as 20, and connections as rod 21 between the cam and the frame F, substantially as described.

8. The combination of a reeiprocatory bed or member, a rack thereon, a rack-driving gear, a movable frame supporting said drivegear, a driver-pinion, connections between said driver-pinion and said driving-gear, a cam, and connections therefrom for controlling the movement of the fr'ame as the rackdriving gear passes the ends of the rack, substantially as described.

Signed at New York, in the county of New York and State of New York, this 9th day of January, A. D. 1894.

WALTER SCOTT.

Witnesses:

R. W. BARKLEY, CHARLES A. BRODEK.