US1601757A - Gripper-pad and tympan-clamping device of printing machines - Google Patents

Description

Oct. 5 1926.

w. G. KENYON GR IPPER PAD AND TYMPAN CLAMPING DEVICE OF PRINTING MACHINES 2 Sheets-Sheet 1 Filed J an. l3

m m u m Oct. 5, 1926. 1,601,757

- W. G. KENYON GRIPPER PAD AND TYM'PAN CLAMPING DEVICE OF PRINTING MACHINES Filed Jan. 15, 1925 2 Sheets-Shet 2 Patented Get. 5, 1926.

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WALTER eonnon KENYON, or ALTRIN HAM, nnetaivngessrenon To LINOTYPE AND MACHINERY LIMITED, or Lennon, ENGLAND, A BRITISH COMBANY.

GRIPPER-IPAD Ann 'rYMrAn-cLAMrrne nnvrcn rnnvrnm iviecnnvns.

Application filed. January is, 1925, Serial No.

This invention relates to gripper pad and tympan-clarnping devices of printing ma chine cylinders and particularly to the means whereby those devices can be adjusted to suit different thicknesses of the material to co-operating with the grippers, or to fulfill that same function as well as serving to clamp to a cylinder, one end of the rubber or other blanket or tympan with which it may be clothed; or, again, to fulfill the function of a tympan clamp only. However, to avoid circumlocution, the device is hereinafter described mainly with reference to its use as a gripper pad. I

The term tympan is herein used todenote the cylinder covering whether it be a rubber blanket, an impression blanket or a tympan. v

The invention consists in so constructing and arranging the gripper pads or stops and their common gripper pad shaft, that by turning the latter angularly, the outer or gripping ends of the said pads can be moved nearer to and farther from the axis of the them for gripping matecylinder to adapt thicknesses to be printed rial of the varying upon.

In one constructional form of the invention, the aforesaid adjustment of the gripper pads, is effected by angular movement of these pads as'a whole about an axis which is itself movable arcually, so that there is no necessity for the pads to comprise relatively movable members such as have heretofore been provided in existing mechanism of the same character. j The invention will now bedeseribed by reference to the accompanying drawings in which:-

Figure 1 is a side elevation, partly broken away, of a cylinder (in the'example here illustrated, an impression cylinder) fitted with the improved arrangement of gripper devices; a

Figure 2 ure 1; U I I Figure 3 is an end elevation partly in section of a portion of the cylinder, showing a gripper pad in an intermediate position is a view of a portion of Fig- 2,059 and in Great Britain January 19, 1924.

of adjustment, said pad in the arrangement here illustrated, fulfilling its normal function of co-operation with the respective gripper, and that of a tympan clamp;

Figures 4; and 5 are views similar to Fig- I -ure 3, with parts omitted, and representing the gripper pad in relatively different posi tions suitable for the requirements of different1 thicknesses of material to be gripped; anc

Figure 3, showinga gripper pad arranged to fulfill only 1ts normal function of cooperation with the respective gripper. 7

Figures 2 to 6 are drawn all to a scale larger than that to which Figure 1 'is drawn.

In each of the constructional forms shown in the drawings,the gripper pads or stops 1, of which there are any desired number, ar frictionally mounted on a gripper pad shaft 2 on which are pinned or otherwise secured, eccentrics or eccentric journals 3, 3, rotatably supported in bearings 4 formed within the cylinder 5.

The boss 6 of each of the gripper pads 1,

is split and provided with two lugs 7 and a clamping screw 8,-a liner 9 being interposed between the lugs 7, which is of such thickness that when the screw 8 is screwed tightly home, the-said shaft can turn stiiily within the boss 6', or vice versa. 7

At that end of the gripper pad shaft 2 on which is secured the eccentric 8 said shaft projects outwardly beyond the corre-',

sponding end of the cylinder 5, and is there screw-threaded as at 10 for receiving a locknut 11, and terminates in a square end 12 to which may be applied a key or handle wherewith to turn this shaft.

The eccentric 3 is formed with a collar 8 contacting with the inner face of the adjacent bearing f and has on its periphery, a scale whichco-operates with a pointer 13 secured to that bearing, for indicating angular positions of the gripper pad shaft 2 relatively 'to thecylinder 5 for given thicknesses of material to be gripped.

The lock-nut ll'is pierced by tommy holes 1a or otherwise formed so that it canbe readily turned on the screw 10 for releasing and tightening the gripper pad shaft 2, the last-named function resulting from the drawing of the collar 3* hard against the adjacent bearing''e.

Figure 6 is a view similar to a part'of In the particular arrangement now under review, the gripper pads 1 are in position for gripping material of minimum and max imum thickness when the axis 16 of the gripper pad shaft 2 is located outside and inside the axis 17 of the eccentrics 3, 3, along a radius of the cylinder 5, as shown respectively in Figures 4 and 5, while for an intermediate thickness of material, the axis 16, regarded in the sense of direction of rotation of the cylinder 5, would be in advance of the axis 17 in some such position as is indicated in Figure 3. lVhen, therefore, it is necessary to adjust the gripper pads 1 to adapt them for "ripping material of dif .ferent thicknesses, this is effected in the following manner. The gripper pad shaft 2 is unlocked-by turning the lock-nut 11, counterclockwise as viewed in Figures 3, 4 and 5, and is thereafter turned clockwise until the operative or outer faces of the gripper pads 1, as will be indicated by registration of the respective scale marking with the pointer 13, are at the proper distance from the axis of the cylinder 5, compatible with the thickness of material to be provided for, the said pads, during this turning of shaft 2, being prevented from rotating with it, through their contact with the tympan 15. After this, the gripper pad shaft 2 is again locked by tightening the lock nut 11 thereby re taining in position the said shaftwith the gripper pads 1 thereon, pressing firmly against the tympan 15 to secure its leading end on the cylinder edge 19, as shown in Figures 2 to 5 of the drawings.

lVhen, with the last described arrangement, conditioned as shown in Figure 4, it isdesired to remove from the cylinder 5 the tympan then upon it and substitute another tympan therefor, this is effected as follows. The gripper pa-d shaft 2 after being unlocked as previously described, is turned counter-clockwise as viewed in Figures 3, 4 and 5, so as to bring the gripper pads 1 into a position within the. cylinder gap 18 such as that in which they are represented in broken lines in Figure 3. The tympan 15 is then detached from the cylinder 5 and the required substitute one properly positioned on said cylinder, after which the gripper pad shaft 2 is turned clockwise to first bring the gripper pads into clamping contact with the tympan 15 and thereafter .to bring the outer or operative ends of the gripper pads into position for proper cooperation with the grippers 20. After this, the gripper pad shaft '2 is again locked by tightening the lock nut 11, as previously described.

In the constructional form of the invention shown in Figure 6, the tympan 15 is secured to the cylinder edge 19 by a keeper plate 21 attached to that edge by screws 22, so that the gripper pads l are not called upon to exercise any clamping function on said tympan, the said keeper plate 21 itself serving to arrest the angular motion of the gripper pads during the turning in clockwise direction (as viewed in Figure 6) of the gripper pad shaft 2. So far, therefore, as concerns the relationship of the keeper plate 21 to the gripper pads 1, the former acts merely as a stop for the latter, and that being the case, it will be obvious that if an independent stop be provided in appropriate position, the gripper pads may fulfill their normal function without contacting with either the keeper plate 21 or the tympan 15.

When it is desired to adjust the gripper pads 1 of the last described arrangement to enable material of different thicknesses to be engaged l etween them and the grippers 20, this is effected in the following manner. The gripper pad shaft 2 is unlocked as previously described, and thereafter the said shaft 2 is turned clockwise until the particular scale marking on collar 8" appropriate to the thickness of material to be provided for, registers with the pointer 13, the shaft 2 being subsequently again locked in position by turning the nut 14 as before explained.

The improved adjustable single piece gripper pads according 'to the present invention possess the very great ad-vanta-geof rigidity when in use, there being no parts liable to displacement under the repeated action of the grippers when closing on the sheets.

Having described my invention, I declare that what I claim and desire to secure by Letters Patent is 1. The combination with a printing machine cylinder, of a single-piece device carried thereby whose outer end is adapted to be adjusted nearer to and further from the axis of said cylinder, and'a gripper pad shaft eccentrically journalled in the cylinder about the axis of which the single piece deviceis angularly movable, and which is itself angularly adjustable in the cylinder about an axis different from and parallel with that of the shaft.

2. The combination with a printing machine cylinder, of a single-piece device and shaft. according to claim 1, of a gripper adapted to cooperate with the outer end of the said device.

3. The combination with a printing machine cylinder, and a tympan enwrapping the cylinder, of a single-piece device and shaft according to claim 1, said device being adapted to clamp the tympan between itself and a cylinder edge parallel with the axis of the cylinder.

4. The combination with a printing ma chine cylinder, of a single-piece device and shaft according to claim 1, of a stop on the cylinder adapted to limit the angular move ment of the said device during the angular movement in one direction of the shaft.

5. The combination with a printing machine cylinder, of a single-piece device carried thereby whose outer end is adapted to be adjusted nearer to and further from the axis of said cylinder, a shaft about the axis of which the single-piece device is angularly movable, journals on the shaft, and bearings in the cylinder within which the ournals are angularly adjustable about an axis different from and parallel with that of the shaft. 7

6. The combination with a printing machine cylinder of a plurality of single-piece devices carried thereby whose outer ends are adapted to be adjusted inwards and outwards of the cylinder, a shaft about the axis of which the single-piece devices are angularly movable, hearings in the cylinder within which the shaft is angularly adjustable about an axis different from and parallel with its own, and a locking device adapted to lock the shaft in different positions of adjustment.

7. The combination with aprinting machine cylinder, of a plurality of single-piece devices carried thereby whose outer ends are adapted to be adjusted inwards and out-.

wards of the cylinder, a shaft about the a of which the single-piece devices are angularly movable, eccentric journals on the shaft, bearings in the cylinder within which the shaft is angularly adjustable about an axis different from and parallel with its own, and a locking device adapted to lock the shaft in different positions of adjustment.

8. The combination with a printing machine cylinder, of a plurality of single-piece devices carried thereby whose outer ends are adapted to be adjusted inwards and outwards of the cylinder, a shaft about the axis of which the single-piece devices are angularly movable, bearings in the cylinder within which he shaft is angularly adjustable about an axis different from 'and parallel with its own, a locking device adapted to lock the shaft in different positions of adjustment, grippers adapted to co-operate with the outer ends of the single-piece devices for gripping material between said grippers and devices, and mutually co-operative means on the shaft and cylinder adapted to indicate positions of the shaft appropriate to different thicknesses of material to be gripped.

9. The combination with a printing machine cylinder, having a gap in its periphery, of a tympan enwrapping the cylinder and extending into the gap over one edge thereof, a plurality of single-piece devices carried by the cylinder, whose outer ends are adapted to be adjusted inwards and outwards of the cylinder and to clamp the tympan againstthe gap edge, a shaft about the axis of which the single-piece devices are angularly movable, bearings in the cylinder within which the shaft is angularly adjustable about an axis different from and parallel with its own, and a locking device adapted to lock the shaft in different positions of adjustment.

10. The combination with a printing machine cylinder having a gap in its periphery, of a tympan enwrapping the cylinder and extending into the gap over one edge thereof, a plurality of single-piece devices car ried by the cylinder, whose outer ends are adapted to be adjusted inwards and outwards of the cylinder and to clamp the tym pan against the gap edge, a shaft about the axis of which the single-piece devices are angularly movable, hearings in the cylinder within which the shaft is angularly adjustable, about an axisdifferent from and parallel with its own, a locking device adapted to lock the shaft in different positions of ad justment, grippers adapted to co-operate with the outer ends of the single-piece devices for gripping material between said grippers and devices, and mutually co-operating means on the shaft and cylinder adapted to indicate dilfcrentangular positions of the shaft appropriate to different thicknesses of material to be engaged by the single-piece devices.

In testimony whereof I have affixed my signature hereto.

WALTER GORDON KENYON.

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