US1840750A - Trip mechanism for printing presses - Google Patents

Description

Jan. 12, 1932. c. c. SWEET ET AL 1,840,750

TRIP MECHANISM FOR PRINTING PRESSES Filed Aug. 8, 1930 4 Sheets-Sheet l C0 1 C, W

Jan. 12, 1932. c. c. SWEET ET AL TRIP MECHANISM FOR PRINTING PRESSES I Filed Aug. 8, 1930 4 Sheets-Sheet 2 OJ 6 f 4 5 8 I \l I w /5 a; /6 m /7 2a /5 /8 P k q o J/ 4 y if 55 grm'nto'r W C, W

Jan. 12, '1932. c. c. SWEET ET AL 1,840,750

TRIP MECHANISM FOR PRINTING PRESSES Filed Aug. 8, 1930 4 Sheets-Sheet, s

4 5, x x 57 L T Q I Z? L, I I :::::J I o 55 5g 5* Z '5' 60 28 5 2:1 1 4 6 g -19) 55 54 4 2 55 6x9 Z3 58 58 6 59 /A X) I fifi; 0v 1/6 4 3 T' gwwntms M C. W

Jan. 12, 1932. c. c SWEET ET AL 1,840,750

- TRIP MECHANISM FOR PRINTING PRESSES Filed Aug. 8, 1930 4 Sheets-Sheet 4 g f an on W01 I 1 I. M C W Patented .Ean'. a2, 1932 means stares mrsnr easier cam. e. swnrrr, or MILWAUKEE, AND WILLIAM J. BAYER, or snonnwoon, WISCONSIN,

'ASSIGNORS T CLAYBOURN PROCESS OOBPQRATION,

A CQREORATION 0E WISCONSIN OF MILWAUKEE, WISCONSIN,

raw morrmsm roa PRINTING rnnssns Application filed August 8, 1930. Serial No. 478,900.,

The invention relates to trip mechanism I for printing presses whereby in the event of sheet or sheets to be fed to linders will be moved the failure of a the press, the plate cy sion cylinder so that the parts of the press will not be damaged. The ob ect .of the present invention is to provide a trip mech-- anism wherein the controlling means is arranged concentric with the axis of the impression cylinder and wherein preferably the power necessary to move the plate cylinders out of registry with the impressioncylinder is derived from the same rotating s aft as that that carries the impression cylinder. The invention is more particularly characterized by the fact that a cam is mount ed to rotate in unison with the impression cylinder and is operatively connected with the plate cylinders for moving the same into or out of printing position and has switching mechanism associatedtherewith to determine the position in which the plate cylinders will be placed relative to the impression cylinder dependent upon the condition of the press.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

1n the drawings Fig. 1 is an end elevation view of a press equipped with the trip mechanism embodying the invention,' parts being broken away;

Fig. 2 is a detailed sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a view looking into the interior of the trip cam, the same being taken on a section generally along the line 3-3 of Fig. 4, arts being broken away;

Fig. 4 is a detailed sectional View taken on the line 4-4 of Fig. 3;

Fig. 5 is a detailed sectional view taken along the line 5 5 of Fig. 3;

Fig. 6 is a detailed sectional view taken on the line 6.6 of Fig. 2.

For the purpose of illustrating the invention I have shown a multi-color printing press wherein three plate or printing cylinders designated in general by the numeral 8 are grouped about a single impression cylinder 9 and wherein the sheet is delivered to the impression cylinder from a rotary feed device 10 ofany suitable construction and the printed sheet is removed from the impression cylinder through a rotary delivery device 11 of any suitable construction.

Referring to Figures 1 and 2 the im ression cylinder 9 is mounted on a sha t '12 which is driven by any suitable source of power and rotates in the journal bushings 13 that are mounted in the end frames 14 of the press. Each of the plate cylinders 8 as shown more particularly in Fig. 2 has a shaft 15 journalled in a bushing 16 which bushin fits an eccentric bushing 17 )that in turn is afapted to rotate in a bore 18 that is eccentric to the axis of rotation of the shaft 15. Each end of the shaft for each plate cylinder is thus journalled and mounted for eccentric movement relative to the end frames 14. Each plate cylinder carries a gear 19 at one end of itsshaft which when the cylinder is in printing position meshes with a gear 20 secured to the shaft 12 of the impression cylinder so that all the plate cylinders are revolved simultaneously with the turning of the shaft 12 from the power source and the ratio of the gears 19 and 20 are such that the plate cylinders make two revolutions to each one of the impression cylinder and this is also true of the rotary feed and delivery devices 10 and 11 so that two sheets are handled on the impression cylinder for each revolution thereof.

The eccentric bushings 17 at each end of the plate 0 linders are as shown in Fig. 6 each provi ed with a crank arm portion 21 and a link 22 operatively connects each one of these crank arms to a crank arm 23 secured to a shaft 24 journalled in bearings 25 in the end frames 14. Hence it will be observed that oscillation of the shaft 24 will act to turn the eccentric bushing 17 at each end of the shafts 15 of the plate cylinders so as to move the plate cylinders either into or out of printing relation with the impression cylinder 9. In each instance oscillation of the shaft 24 is effected through acrank arm 26 connected by a link 27 with a lever 28 pivoted at 29 to an end frame 14 of the machine. The 100 pin 30 that pivotally connects the link 27 with the free end of the lever 28 carries a roller 31 which is adapted to work in either of the cam tracks 32 or 33 of the grooved cam 34, which cam has its hub 35 mounted to revolve with the power driven shaft 12 of the impression cylinder. With this construction, when the rollers 31 on the levers '28 are disposed to work in the cam track 32 the plate cylinders will be held by the linkage above described in printing relation with the impressioncylinder. In the event however of the failure of a sheet to be delivered to the im' ressi-on cylinder, a mechanism hereinafter escribed is provided for switching the rollers 31 from the groove 32 to the groove 33 and this mechanism during its switching movement acts through the link 27 and crank 26 to oscillate the shaft 24 and through the links 22 and crank arms 21 to turn the eccentric bushings 17 so as to shift the shaft 15 of each plate cylinder away from its normal operating position and thus move the plate cylinders out of registry with the impression cylinder 9 and thereby prevent any printing.

For actuating and controlling the position of the roller 31 the mechanism shown more particularlyin Figures 1 and 3 is provided. Mounted to rotate with the cam 34 are a pair of diametrically disposed switching levers 36, each lever being pivoted on a pin 37 carried by the cam 34, said levers being limited in their arc of movement by movement against a stop shoulder or recess 38 formed on the outer face of the cam track 33 and a stop shoulder or recess 39 formed on the inner face of the cam track 32. Each lever is held in either one of its stop positions by a toggle mechanism which comprises a rod 40 pivotally connected at one end to a pin 41 on the intermediate part of the lever 36 and working in an arcuate slot 42 in the cam 34 and both pivotally and slidably connected at its other end in a block 43 that is free to oscillate in the cam plate, a spring 44 being mounted between the head of the rod and the block 43. The result of this construction is that the spring 44 acting through the rod 40 upon the pin 41 connected with the lever serves to hold the lever in either of its stop positions when the lever has been swung to. this position by mechanism hereinafter described.

Means are provided to always move the levers 36 into the position where they will guide the rollers 31 along the cam grooves 32. This consists of a stationary cam plate 45 arranged in the path of the rollers 46, on pins 41 connected to the switching levers 36, and disposed in the region of the vertical axis through the cam 34 and the impression cylinder at the upper portion of the press.

In the event thata sheet is not fed to the press certain automatic release mechanism which comprises no part of the present invention and which may be of several different forms offered by manufacturers specializing in this type of equipment is employed to actuate -a release rod 46 which is connected through a resetable lever 47 and a link 48 to'a bell crank lever 49 which in turn is connected by a link 50 to another bell crank lever 51 connected by a link 52 toanother bell crank lever 53 pivoted at 54 which lever is in turn connected by a link 55 with a throw-out lever 56 ivoted at 57 upon a front plate 57' suita ly bolted to but in spaced relation with the adjacent end frame The lever 56 is releasa- 14 of the machine. bly held in its extreme positions of movement by a pivoted detent lever 58 which is urged by a spring 58' into engagement with one of the notches 59 in a quadrant 60 associated with the lever 53. The throw-out lever 56 when moved inwardly from the position shown in Fig. 3 comes into the path of movement of the rollers 46 on the pins 41 and as the levers 36 carrying these rollers are revolving with the cam 34 and as said pins are connected with the intermediate portions of said levers 36 it will be observed that under these conditions each of the levers 36 will be swung inwardly from the full line position to the dotted line position shown in Fig. 3 as said levers travel past said throw-out lever during the operation of the press. Consequently, as these levers 36 have been moved to their inner dotted line positions when the cam with which they are turning comes to one of the rollers 31, the same is engaged by the lever 36 and is moved out of the path defined by the groove 32 and over into the path defined by the groove 33 and as we have already seen during this switching movement the plate cylinders are moving out of registry with the impression cylinder and thereafter for the remainder of the revolution the impression cylinders are held out of registry until the cam 34 moves around to again reset the levers 36 through the action of the cam 45 but if under these conditions the feeding mechanism is not operating the next printing cycle of the press will also be rendered inoperative due to the fact that the throw-out lever 56 is again in position to;

move the next lever 36 to the throw-out position and thus again move the plate cylinders out of registry with the impression cylinder.

If feeding conditions have been reestab-,

the machine, consisting of a cam 63 rotating in cyclic synchronism with the machine and engaged by a roller 64 on a bell crank lever 65 connected by a link 66 with the lever 61 with the result that until the cam 63 rotates to a certain position the operator cannot press down on the lever 61 and thus pull up on the lever 47 to reset the throw-out mechanism since the downward movement of the lever 61 is through the link 66 communicative to the bell crank 65 tomove the roller 64 up against the cam 63. It will be-observed from Fig. 1 that cams 67 mounted on the cam plate 34: are provided which are disposed in the path of rollers mounted on the pivot pin connecting the lever 53 with the link 55 with the result that in certain phases of operation of the cam the throw-out lever 56 cannot be moved inwardly,

From the foregoing description it will be noted that we have rovided a trip mechanism for rotary printing presses in which the plate cylinders are moved out of registry with the impression cylinderby means controlled and operated from a cam rotating in unison with the impression cylinder and that the cam provides means for holding the cylinders either in their on or-ofi' position, that the control means associated with the cam is automatically reset for each revolution of the press but that even though reset it the throw-out lever is still in a non-feeding-sheet position, the cylinders will again be moved out of registry with the impression cylinder to revent printing.

e desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except in so far as such limitations are included in the claims.

What we claim as our invention is:

1. In a printing press, the combination of a rotary impression cylinder, printing. cylinders grouped about and cooperating with said impression cylinder, means for moving each of said printing cylinders into and out of printing relation with said impression cylinder, a rotary cam provided with spaced tracks determining the on and 0d position of said printing cylinders and associated with a part of the moving means of each printing cylinder, and switching means between the tracks of the cam cooperating with said parts of said printing cylinder moving means to actuate the latter, said cam and switching means rotating in unison with said impression cylinder.

2. In a printing press, the combination of a rotary impression cylinder, printing cylinders grouped about and cooperating with said impression cylinder, means for moving each of said printing cylinders into and-out of printing relation with said impression cylinder, a rotary cam provided with spaced tracks determining the on and ofl position of said printing cylinders and associated with a part of the moving means of each printin cylinder, switching means between the trac s of the cam cooperating with said parts of said printing cylinder moving means to actuate the latter, said cam and switching means rotating in unison with said impression cylinder, throw-out means to shift said switching means to the off position for said printing cylinders, and means to reset said switching means to the on position of said printing cylinders at each revolution of the impression cylinder.

3. In a printing press, the cpmbination of a frame, an impression cylinder mounted to rotate on said frame, printing cylinders grouped about and cooperating with said impression cylinder, bearing members for the shaft of each printing c linder journalled in said frame eccentric to the axis of the shaft of that printing cylinder, means including a lever for oscillating the bearing members of each printing cylinder to move said cylinder into and out ofprinting relation with said impression cylinder, a cam rotating in unison with the impression cylinder and having spaced tracks in which a part of the said leverswork and by which said printing cylinders are maintained in on or ofi printing position, switching means associated with said tracks and engageable with said levers to move the same, means for setting said switching means, and means for maintaining said switching means in set position; 4. In a printing press, the combination of a frame, an impression cylinder mounted in said frame, printing cylinders grouped about and cooperating with said impression cylinder, bearing members for the shaft of each printing cylinder, journalled in said frame eccentric to the axis of the shaft of that printing cylinder, means including a lever for oscillating the bearing members of each printing cylinder to move said cylinder into and out of printing relation with said impression cylinder, a cam rotating in unison with said impression cylinder and having spaced tracks in which a part of the said levers work and by which said printing cylinders are maintained in on or off printing position, pivoted switching members associated with said tracks and engageable with said levers to move the same, means for setting said switching members, and toggle'mechanism associated with each switching member to maintain it in set position.

5. In a printing press having automatic release mechanism, the combination of a rotary impression cylinder, printing cylinders cooperating with said impression cylinder, means for moving each printing cylinder into and out of printing relation with said impression cylinder, a rotary cam provided with spaced tracks determining the on and oil position of said printing cylinders and provided with switching means for moving said printin cylinder moving means,- throw-out means or said shifting means adapted to be operated by the automatic release mechanism of the press, means for releasably holding said throw-out means in operative or inoperative position, and means to reset said switching means to the on position of said printing cylinders at each revolution of the impression cylinder.

In testimony whereof, We afiix our signatures. CARL 0. SWEET. WM. J. BAYER.

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