US2118965A - Device for interrupting and recontinuing the printing operation of cylinder printing presses - Google Patents

Description

May 31, 1938. A, U N 2,118,965

DEVICE FOR INTERRUPTING AND RECONTINUING THE 'PRINTING OPERATION OF GYLINDERPRINTING PRESSES Filed May 9. 1935 2 Sheets-Sheet 1 7n ventor,

May 31, 1938. BUTTNER 4 2,118,965

DEVICE FOR INTERRUPTING AND RECONTINUING THE PRINTING OPERATION OF CYLINDER PRINTING PRESSES Filed May 9. 19155 2 Sheets-Sheet 2 1*- 1AL m 0 O ,40 6 w; z 2 Z 12 74 3 v i \y 2 75 77 1 A VL 1 1 w 9 W we Inventor Patented May 31, 1938 UNlTED STATES PATENT OFFICE Artur Biittner, Heidelberg, Germany, assignor to Druckmaschinen Aktiengesellschaft, Glarus,

Switzerland Application May 9,

1935, Serial No. 20,660

In Germany May 29, 1934 3 Claims.

This invention relates to a device for interrupting and re-continuing the printing operation of cylinder printing presses in which a rotating impression cylinder co-operates with a reciprocating form bed and in which the adjusting devices provided for the two bearings of the impression cylinder are connected with one another in order to render it possible to lift said cylinder in case of need from the form bed.

As regards stop-cylinder printing presses, the manner of operation of which is such that a measured or rytnmical lifting and lowering of the impression cylinder is not necessitated, it has already been proposed to arrange this cylinder in such a manner that the impression can be interrupted and re-continued and the movement of the cylinder, as requisite therefor can be effected by means of a hand-lever. With this known device for lifting and lowering the impression cylinder the bearings of this latter are carried by springs pressing them against upper adjusting screws. When these screws are turned in one direction, the said cylinder is pressed onto the form-bed, and when turning said screws in the other direction, the springs lift the said cylinder off from the form-bed. The bearings of the impression cylinder are, thus, in said known construction, not firmly secured in upward and downward directions. As a consequence, in the case of heavy printing work, the impression cylinder is heavily loaded in its middle portion in upward direction, the bearings give way downwardly so that the impression cylinder is bent upwardly. In connection herewith attention must be paid to the fact that the forces arising during the printing operation are considerably greater than the pressure which the springs exert upon the bearings. Although that giving-away of the bearings is only very slight, still, it impairs the quality of the printing work and entails increased dressing work.

Another drawback of the known arrangement, dealt with in the preceding lines, consists therein that the lifting of the impression cylinder is not effected in a positive manner, in consequence whereof, if any one of the lifting springs relaxes or breaks, the impression cylinder is, on the side concerned, not lifted from the form bed.

With cylinder printing presses in which the impression cylinder is intermittently lifted and lowered it is known to support the cylinder axle in eccentric sleeves which are automatically turned by means of rods in order to lift orlower said cylinder. This arrangement cannot be employed in connection with cylinder printing presses for heavy printing work, because the turnable sleeves develop a considerable amount of play after only a short time of service, and because, furthermore, if the middle of the cylinder and the middle of the eccentric do not lie accurately one over the other during the printing operation, the eccentric sleeves might turn owing to the back lash in the joints of said rods which would result in a change of position of the impression cylinder. In both cases this cylinder would yield with respect to the form bed during the printing operation.

The object of the present invention is to obviate the above-mentioned drawbacks, and I attain the object in view by clamping both the bearings of the impression cylinder from above and below between adjusting screws, of which screws the upper ones are connected with the respective bearing in such a manner that on the one hand the bearings are secured against any movement during the printing operation, and, on the other hand, when required, can be positively lifted and lowered by means of said upper screws. In this way printing can be stopped, as well as re-continued, quite as required, and, nevertheless, a perfectly firm support of the impression cylinder during the printing operation exists even if very heavy printing work is to be done, so that the impression cylinder cannot yield with respect to the form bed.

In the device according to my invention the interruption, as well as the re-continuation, of the action of the impression cylinder takes place perfectly positively, this cylinder can be adjusted accurately to height as desired without any variation of the position of the print adjusting member. Furthermore, the advantage is obtained that Wear and tear of said adjusting members during longer use of the device cannot increase the back lash of the cylinder bearings during the printing operation, because the upper adjusting screws can always be so much turned that firm clamping of the bearings is obtained.

For the purpose in view it is suitable to provide every adjusting screw both with a right-hand thread and with a left-hand thread, in such a manner, that one thread portion is turnable in the frame of the press, or in the firmly fixed bearing cap respectively, whereas the other thread portion engages the bearing of the cylinder and effects an additional shifting of the bearing of the impression cylinder. In this way an increase of the lifting and of the lowering movement is obtained whereby smaller movements of the actuation members are rendered possible.

- partly a left-hand one The invention can be employed also in connection with cylinder printing presses (for instance two-revolution presses) of the type in which the impression cylinder is lifted and lowered in measured or rythmical succession. In this case the actuation of the stopping and re-continuing device is effected not by means of a handor foot-lever, but automatically, 1. e. by the machine itself.

The device according to the invention is shown in the accompanying drawing in several constructional examples.

Figure 1 shows in a constructional example the corresponding parts of a cylinder printing press in connection with the device according to the invention.

Figure 2 is a plan view of the parts, shown in Figure l, on a smaller scale.

Figures 3 to 5 show the corresponding parts of three further constructional examples of the device according to the invention in vertical section.

On the drawing, I are the lateral frame members of the machine, and 2 and 3 denote the two superposed parts of a bipartite bearing in which the axle 4 of the impression cylinder 5 is supported. The sheets are conducted to said cylinder over the laying-on table 6 by any of the means known and used for this purpose. The two bearings 2, 3 are vertically shiftable. Each bearing has at its bottom-face abutment members I bearing on adjusting screws 8, by means of which the bearings with the axle and the cylinder can be adjusted vertically once for all within certain slight limits.

To the top face of each bearing is secured a pressure plate 9 by means of long screws I extending through the upper half of the bearing into the lower half thereof.

I I denotes the bearing cap in which is provided on each side of the machine an adjusting screw I2 which has partly a right-hand thread I2 and I2 The right-hand thread engages the bearing cap II and the lefthand thread engages the pressure plate 9 which constitutes, therefore, a sort of nut. Affixed to the upper end of each screw I2 is the hub I3 of a hand-lever I4 and I4 respectively, and the two hand-levers are linked together by a rod I5.

If one of said hand levers I4, I 4' is moved in either direction, the two screws I2 are turned correspondingly. If, for instance, the lever I4 is moved in the direction of the arrow I (Fig. 2), the two screws are turned upwardly, to a corresponding extent out of the bearing caps II, and as simultaneously therewith the other portion (I2 of the screw is correspondingly screwed deeper into the pressure plate 9, the stroke is increased, so that it is possible to lift the impression cylinder off from the form bed I9 by a comparatively slight movement of any one of the band-levers I4, I4.

If this lever is moved in the opposite direction, the bearings 2, 3 are moved downwardly until the abutment members I contact with the screws 3. If there should be any back lash in the threads of the screws I2, it may be over-come by a short continuation of the movement of the levers I4, I4 in the opposite direction mentioned, so that the bearings are firmly clamped between the screws 8 and I2 and any giving way of the impression cylinder is with certainty prevented.

Adjustable abutment members (not shown) may be provided which are so arranged with respect to the hand-levers I4, I4 that the movement of these latter in one or the other direction is limited.

The link I5 can be adjustable in its longitudinal direction, for instance by means of a screwed socket I'I so that differences occurring, perhaps, between the back lash of the two screws I2 can be compensated.

Below either bearing 2, 3 is a helical compression spring I6, which serves solely to facilitate the rising of the impression cylinder. As the springs need not carry the impression cylinder, there is obtained the further advantage over the known constructions that an eventual fracture of any of them cannot entail a destruction of any other parts of the machine.

It is, of course, also possible to employ instead of the screws with a right-hand and a left-hand thread screws having only one or other of said threads, and in this case the arrangement of the parts concerned may be such that either only that portion of an adjusting screw which engages the pressure plate 9, or the bearings 2, 3 respectively, is provided with a thread I2 (see Fig. 3) whereas the upper or main portion of the screw or, more precisely, the shaft I2 of the same which passes through the cap I I is not threaded and can merely be turned, but not moved axially; or the upper portion I2 (see Fig. 4) of the screw I 2 is threaded and can, therefore, be moved vertically in the cap plate II, whereas the bearing (by the intermediary of the plate 9) is suspended from said screw I2 this latter being, nevertheless, rotatable.

Instead of adjusting screws, shown in Figs. 1 to 4, with a hub I3 firmly connected therewith and providedwith the hand-lever I4 or I4 respectively, a threaded spindle I2" (see Fig. 5) engaging the bearings 2, 3 might provided, this spindle engaging also a rotary nut I8 which is unshiftably arranged in the cap plate II of the press and is actuated by the hand-lever I4 or an equivalent therefor.

I claim:

1. A device for interrupting and re-continuing the printing operation in cylinder printing presses, comprising, in combination, with the impression cylinder, the bearings supporting it, adjustable supporting screws for said bearings and an upper adjusting screw for each bearing, said upper adjusting screws being connected to said bearings and each upper adjusting screw having a right-hand thread and a left-hand thread, one of said threads engaging the frame of the machine and the other thread engaging the bearing of the cylinder, said upper adjusting screws being adapted to lift and lower said bearings positively and to press the latter against the lower supporting screws, and means for simultaneously turning said upper adjusting screws.

2. A device for interrupting and re-continuing the cooperation of a rotating impression cylinder and a reciprocating form bed of a cylinder printing press, comprising in combination, with the impression cylinder, the bearings supporting it, adjustable supporting screws for said bearings and an upper adjusting screw for each bearing, said upper adjusting screws being connected to said bearings so as to positively raise and lower said bearings and to press the latter against the lower supporting screws, each upper adjusting screw having a right-hand thread, and means for simultaneously turning said upper adjusting screws.

3. A device for interrupting and re-continuing the cooperation of a rotating impression cylinder and a reciprocating form bed of a cylinder printing press, comprising in combination, with the impression cylinder, the bearings supporting it, adjustable supporting screws for said bearings and an upper adjusting screw for each bearing, said upper adjusting screws being connected to said bearings so as to positively raise and lower said bearings and to press the latter against the lower supporting screws, each upper adjusting screw having a left-hand thread, and means for simultaneously turning said upper adjusting screws.

ARTUR BITPI'NLEIR.

Images