US1302693A - Trip-control mechanism for printing-presses. - Google Patents

Description

R. M IEHLE. TRIP CONTROL MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED NOV, 5, I917.

Patented May 6, 1919.

k mfim ATTORNEYS 'srnrns rn'rnnr orrion.

ROBERT MIEHLE, or CHICAGO, rumors.

. TRIP-CONTROL MECHANISM non rrtinrme-rnnssns.

neoaces.

Specification of Letters Patent. Patented May 6, 1919,

Application filed November 5,1917. Serial Nb: 200,376.

ling the trip mechanism which minimizes mental effort required in tripping a machine during a given cycle.

In the present state of the art it is the practice to employ press operated means for tripping the press, and. to provide positioning means, which is generally manually actuated, to position the press driven means to trip the machine. In tripping mechanisms of this character the positioning means is efl'ective to position the press driven tripping means only during a short period in the cycle of the machine. Thus, if the positioning means is moved to tripping posi tion at any other period in that cycle of the machine, and is moved from its tripping position before the tripping mechanism assumes a position in which said positioning means is, eflective to trip the mechanism, the

a machine will not trip. And, if the positionllig-HTGELIIS is moved to tripping position, and is held there more than a cycle of the machine it is liable to trip the machine twice where it was the intention of the. operator to trip the same but once. As a result, the operatormust constantlywatch the machine so that he does not move the positioning means to tripping position too early and that he does not releasethe same too late. In order that the operatormay be relieved of a great portion of this mental effort, while tripping the machine, I provide mechanism whereby the positioning means of the tripping mechanism can only be moved to tripping position during that period in which said positioning meansis actually effective to position. the press driven tripping mechanism, and I further provide means for moving said positioning means to its normaluntripping position immediately of ter the movement of said positioningmeans to tripping position has become effective uponthe trapping mechanism. I also provide means, wh ch may be attached or detached at the will of the operator. from the positioning means whereby said positioning means will be automatically moved to tripping position at the proper time to trip theis machine during each cycle thereof so that theimachine may be tripped for a succession of cycles without requiring the operator to i move the positioning means to tripping position during eachcycle;

H. A further object of my invention resides in providing means whereby the above de scribed mechanism may be utilized in tripplng a two couple machine. In machines of the two coupletype, it is common to employ press driven timing means for positioning the trip positioningmeans of the second couple, said press, driven tlmlng means serving will be effective to position said tripping mechanism to trip the second couple, and in con unctlon with the press drlven timing means a coupling means is employed which may be moved to render said press driven timing means effective uponthe trip positioning means of said second couple, said coupling means being controlledby a foot trcadle which may be moved to position Stud couphngmeans to render said press I driven timing means effective upon said trip positioning means of the second couple at a timeprevious to that time in which the press timing means moves said trip positionlng means of said second couple into tripping position. The timing of the several couples is such that, in order that a sheet may be trapped so that it 1s notprinted upon byboth couples as it passes through the ma- .chlne, the JG-P1P. positioning means, of the first couple should be positioned to trip the first couple at a time previous to the time. in which thetrip' positioning means ofthe secand couple should be moved to tripping position to trip the second couple as the sheet passesthrough the machine. It is common to arrange the trip positioning means of both couples so thatthe operator may ,operate both, to; moveithe same to tripping poto position said trip positioning means of the second couple at a time when the same.

sition at the same time by pushing down upon one treadle. In tripping a machine of this character the operator must see to it that he depresses the treadle after the trip positioning means of the second couple has become ineffective to trip said second couple relatively to the last sheet passing through the machine, and as above stated before the trip positioning means of the first couple is effective to trip that couple relative to the sheet which he desires to be tripped. -My invention renders it unnecessary that the operator see to it that he exerts' pressure upon the treadle only during the above mentioned period. In accomplishing this I provide means, in addition to the trip positioning timing means, as above described, whereby said coupling means of the trip positioning means of the second couple is moved into operative relation with said press driven trip positioning means-of the second couple simultaneously with the movement of the trip positionlng means of the first couple into tripping position. And it will be noted further that by providing press driven timing means for the trip positioning means of the first couple which is adapted to move said trip positioning means of the first couple into untripping position immediately after the same has been effective to trip the first couple that the operator cannot inadvertently trip the first couple on the succeeding sheet by keeping the treadle depressed too long.

Thus it'will be noted that the operator need only see to it that he exerts pressure upon the treadle at any time during the preceding cycle of the first couple to trip the sheet providing he maintains pressure thereon until the press driven timing means of the trip positioning means of the first couple allows said trip positioning means to be moved to tripped position. In order that the operator may trip the machine at the latest time possible, whereby'he may have as much time as the necessary arrangement of the machine may allow, I time the above noted press driven timing means so that said press driven timing means allows the treadle to be depressed just after the grippers'ofthe first cylinder would take the fed sheet, the tripping mechanism of the first cylinder being so arranged that this cylinder is tripped between that point and the point'where the grippers would engage the leading edge of the fed sheet with the form as is the usual "case.

With these and other objects in view which will be hereinafter fully described and particularly pointed out in the claims the invention resides in the mechanism illustrated in the accompanying drawings forming a part of this specification and disclosing thepreferred embodiment thereof, in which:

Figure 1 is a partial side elevation of a printing press in which are incorporated the features of my invention.

Fig. 2 is a section in front elevation on the line 22 of Fig. 1.

Fig. 3 is a partial side elevation of a printing press showing my invention as applied to a tripping mechanism similar to that disclosed in my United States Patent, No, 1,081,320, granted Dec. 16, 1913.

Fig. 4 is an enlarged section in plan elevation on the line 4-4 of Fig. 1.

Fig. 5 is a partial side elevation of a portion of the mechanism showing the same in a different position than that illustrated in Fig. 1.

Fig. 6 is a similar view with the parts in a different position.

Fig. 7 is an enlarged partial top plan view of a portion of the mechanism as illusparts in the various views.

. While I have illustrated the invention as applied to a two couple machine it will be obvious that from the following description the invention may be used upon a single couple machine with equal advantage.

In the drawingsl designates the frame of the machine in which is journaled the first impression cylinder 2, the transfer cylinder 3, and the second impression cylinder 1. The impression cylinder 2 rotates in a counter clockwise direction, the transfer cylinder 3 rotates in a clockwise direction, the impression cylinder 4; rotates in a counter clockwise direction. The bed 5, which carries a form 6 for the first impression cylinder 2 and a form 7 for the second impression cylinder 4 is reciprocated in unison with said cylinder. A cylinder 2 is provided with grippers 8 which are adapted to take a sheet from a feed-board 9, brin the same in impression relation with the orm 6, and to then transfer the sheet to the grippers 10 of the transfer cylinder 3 which transfer the sheet to the grippers 11 of the cylinder 4 which takes the sheet and brings the same into impression relation with the form 7 after which said grippers release the sheet upon a delivery apparatus not shown as'is the usual practice.

The impression cylinders 2 and 4.- are adapted for movement transversely of their axes to move the same into and out of printing relation with their respective forms, the same being journaled in boxes 12 which are slidably mounted in guide ways 18 of the press frame 1. These boxes 12 are provided with springs let which are adapted to move said boxes to position the impression cylinders in their nonimpression or tripped )osibe moved into impression relation with their respective forms against the influence of the springs 14, said eccentric mechanism being provided wlth actuating arms 16 whereby the same may be moved.

The tripping mechanism as shown is of usual construction and is fully described in the United States Patent, No. 1,081,320 granted to me Dec. 16, 1913, and needs but a cursory description in order that this invention may be fully understood. A cam shaft 17 is journaled in the press frame and is driven from the press mechanism and makes one complete revolution for each cycle of the machine. A rockshaft 18 is journaled in the press frame and has a cam arm 19 affixed thereto, which is provided with a friotion roller which is engaged withthe groove of a cam 20 mounted upon said cam shaft 17. The cam arm 19 is rotatably mounted upon said rock shaft 18 and carries a hook 21 fixedly mounted at its outer end, which is adapted to engage the tooth 22 fixedly mounted upon said rock shaft 18. Arms 23 are mounted upon said rock shaft 18 on either side of the machine and are connected with their respective actuating arms 16 through, connecting links 24, and the eccentric meehanisms 15 are actuated to move the impression cylinder into and out of impression position by the cam 20 acting through the cam arm 19, hook 21, tooth 22, arm 23, and the connecting links 24 which are connected to said actuating arms 16. The hook 21 is pivotally mounted upon the cam arm 19 and is adapted to be moved out of engage ment with the tooth 22. A roller .25 is mountedupon the hook 21 near the free end thereof and travels in the groove of a cam lever 26 which is fixedly mounted upon a rock shaft 27 journaled in the press frame. The

upwardly facin surface of thecam groove of the cam lever'26 is provided with a raised portion 28, which lies below theroller 25 when the roller of the cam arm 19 is passing through the are a b of the cam 20, the mechanism being so arranged thatfwhen said roller of the cam arm 19 is passing through said arc a b the impression cylinder is inits upper or tripped. position. lfthe cam lever 26 is raised, while the parts are in this position, the raised portion 28 engages the roller 25 to lift the hook 21 out of engagement with the tooth 22, thus disconnecting the cam arm 19 from the ecceiitric mechanisms 15 whereby the cylinder remains in its upper or tripped position-during the succeeding revolution of said cam 20. 1f the cam lever 26 is released during the time that the roller of the cam arm 19 is passing through that portion of the groove of the cam 20 which lies in the are 6 0,10 d,

. and d a, said cantilever and hook 21 are supported by the' engagement of the under sur faceof the hook, which lies between the hook portion thereof and the roller of the cam arm 19, with the crown of the tooth 22, the tooth receiving portionof said hook having passed out ofengaging relationwitli said tooth during the initial movement of the roller of cam arm. 19 through the are D 0. If said cam lever 26'is released during said period the hook reengages the tooth as said roller of cam arm19 passes through the are a Z) after having passed through said are (Z a, whereupon the normal position of the parts is again resumed. It will be noted that while theiroller of the cam arm 19 is passing through the are c d that the cylinder is in impression relation withits form.

Fixedly mounted upon the rock shaft 27 is a lever 29, and a tension spring 30 has its opposite endsconnected tosaidlever 29 on the press frame to normally maintain the downwardly facing surface of. the cam groove of the cam lever 26 against the roller 25- A push rod 31has its lower end pivotally connected to the outer end of the lever 29 and extends upwardly through the foot board 32 which is supported, on the main frame. A cam 33is mounted upon the cam shaft 17,and a lever 3 1 is fixedly mounted upon said rock shaft 27 and has a'friction roller 35 mounted upon the outer end thereofand adapted to engage said cam The cam 33 has a high portion 36 and a low portion 37, the low, portion 37 being relatively shortand being disposed to engage said roller 35 when the roller of the cam arm 1.9 is inthe arch a b and is just about to enter the arc b o of the cam 20. It will be noted at this point that, due to the fact that the raised portion 28 of the cam lever 26 is relatively short said camlever 26 can only operateto lift the hook21 out of engagement with the tooth when the roller of the cam arm 19 is in the are a Z), and that the ing of said cam lever 26. or the; moving of the same to trippingposition, is only effective toactually trip the press as the roller of the cam arm 19 is entering the arc Z) c, that is, there is but one point in the cycle ofthe machine, andthat is a relativelyshort period, in which the movement of said cam lever 26 into tripping position is efiective to position the part of the tripping mechanism to. actually tripthe cylinder. Thus, regardless of how long the cam lever has been held in lts raised or tripping-position themecha- 111E111 will not trip unlesssaid cam lever is time during the cycle of the machine. However the cam 'will prevent said push rod 31 from moving downwardly to raise the cam lever 26 until just before the mechanism has reached that position inwhich the raising of said cam lever 26 into tripping position will be effective to trip the machine. In this way the operator is notified that he has in fact tripped the mechanism by the raising of said cam lever. Following the actual tripping of the mechanism the cam 33 actuates the lever 34 to move the cam lever26 and its connected partsback-to untripping position whereby the operator is notified that he has held the cam lever in tripping position long enough to trip the machine for that cycle whereby he is prevented from inadvertently maintaining the cam lever 26 in its raised or tripping position and'the machine is prevented from tripping twice where the operator intended the same to trip but once.

The treadle portion 38 of the push rod 31 passes through an enlarged hole 39 in the foot'board 32 whereby the same is allowed to be'moved laterally. A pivot bracket 40 is secured upon the under side of the foot board 32 and an actuating lever 41 is pivotally mounted thereon. One arm of the actuating lever 41 extends toward the push rod 31 and a compression spring 42 is disposed between said foot board and saidarm and serves to maintain said arm in its lower position, the ends of the spring 42 being received within recesses of the foot board and said actuating lever where said spring is maintained in proper position. "A second arm 43 extends outwardly from the other side of the pivotal point of the actuating lever 41 and abuts the pivot bracket 40 and limits the downward movement of the other side of said aetuating lever. A latch dog 43 is pivoted to the push rod 31 at 44 and is adapted to move toward and away from the outer end of the adjacent arm of the actuating lever 41. Said latch dog 43 is provided with a stop 45 which engages the push rod 31 when said latch dog is in its position nearest adjacent said actuating lever 41, and a compression spring 43 is disposed between said'latch dog and the push rod 31 and serves to maintain the same in its outer position, said compression spring having the opposite ends thereof engaging recesses in the push rod 31 and said latch dog to maintain the same in proper position. The push rod 31 is inclined away from the actuating lever 41 and the upper end thereof normally rests against the side of the hole 39 opposite said actuating lever. In this position the latch dog 43 is disposed to one side of the outer end of the adjacent arm of the actuating lever 41 whereby said push rod may move up anddown longitudinally without interference from said actuating lever. The latch dog 43 is'provided with an'upwardlyfacing surface 46, and the actuating lever 41 is'proparts in the different figures.

vided with a downwardly facing surface 47. The surfaces 46 and 47 are so disposed that when the push rod 31 is moved to tripping position and is then moved laterally toward said actuating lever, the hole 39 being large enough to permit this, the surface 46 lies below surface 47. If the push rod 31 is allowed to raise while in this lateral position said surface 46 engages said surface 47 and the force of the spring 42 is exerted upon said push rod to move the same downwardly. The strength of the spring 42 is relatively greater than the strength of the spring 30 whereby the roller 35 of the lever 34 is maintained in constant engagen'lent with the cam 33. Inasmuch as the low portion 37 of the cam 33 passes over the roller 35 when the tripping mechanism is in such position that the raising of the cam lever 26 to tripping position will be effective to trip the machine, the machine will be tripped constantly when said actuating lever is in engagement with said latch dog. The surface 46 is inclined downwardly and away from the actuating lever, and the surface 47 is inclined downwardly toward said latch dog whereby said actuating lever and latch dog cannot work out of engagement as said push rod is moved upwardly and downwardly. By reason of the fact that the latch dog may be moved toward the push rod 31 against the influence of the spring 43 the push rod 31 may be moved toward the actuating lever at any time, thus allowing said push rod to be moved toward said actuating lever and downwardly simultaneously. Fig. 5 shows the position of the actuating lever, latch dog and push rod when said latch dog is in engagement with said actuating lever, and the roller 35 is passing under the low portion 37 of the cam 33. Fig. 6 shows the position of the actuating lever, latch dog and push rod when said actuating lever and latch dog are in engagement and the roller 35 is passing over the high portion 36 of the cam 33.

As before noted Fig. 1 shows a two couple printing machine to which my present invention has been applied. The mechanism which actuates the tripping mechanism of the second couple needs no description for the perfect understanding of the present invention and is fully disclosed in my United States application, Serial No. 161,700, filed April.13, 1917.

Figs. 3, 7 and 8 show my invention as applied to a two couple printing machine having tripping mechanism similar to that disclosed in the ,United States Patent No. 1,081.320, granted to me Dec. 16, 1913. The

machine shown in Figs. 1 and 3 are gen-.

erally similar in structure and similar reference characters are given to the similar The only difference between these machines lies in the recaees mechanism for positioning the tripping mechanism for the second couple. It will be noted that as herein disclosed and as disclosed in the above noted patent the trip positioning of the second couple is manually positioned in the following manner. The trip positioning cam of the second couple, which is similar to the cam lever 26 as above described is fixedly mounted upon a rock shaft similar to rock shaft 27, as above described, and a lever 4:8 is affixed to said rockshaft in a manner similar to the way in which the lever 29 is aflixed to the rock shaft 27 as above described. The outer end of the lever 18 is disposed adjacent the cam shaft 17 and has a friction roller 49 mounted thereon for rotation and for lateral movement along the axis thereof. A cam 50 is fixedly mounted upon said cam shaft 17, and a tension spring51 has the opposite ends thereof fixed to said lever 48 and the press frame and is adapted to move said lever 18 toward the cam 50, a stop 52 being provided to limit this movement of the lever d8 so that the roller 19 is just out of contact with the low portion of the cam 50. The cam 50 is provided with a high portion 53 which is so timed as to move the lever 18 downwardly when the cam lever which is affixed thereto is effective to trip its respective tripping mechanism. As beforestated the roller 49 is movable laterally in the direction of its axis, and it is adaptedtobe moved into or out of the path of said cam 50. A bell crank lever 54: is pivotally mounted upon a bracket of the press frame and has one arm thereof extending upwardly and adapted to engage a stud of said friction roller 49. The rock shaft 27 of Fig. 3 is provided with a second bell clockwise direction, with said rod 56 out of engagement with the bell crank lever 54.

A push rod 58 is pivotally connected to theouter endof the horizontally extending arm of the bell crank lever 55 and extends upwardly through a hole 59 in the foot board 32, and the parts are so arranged that when the push rod 58 is pushed downwardly the bell crank lever 54 is actuated to pushthe roller 49 into the path of the cam 50. The cam shaft 17 rotates in a counter clockwise direction and a face cam 60 is formed integral with the cam 50 just beyond the trailing portion of the high portion 53 and is adapted to push the friction roller 49 out of the path of said cam 50 as said face cam 60 passes by the roller. As before noted this mechanism is fully described in the above noted patent and needs no further descriptionor disclosure herein to fully describe thisinvention.

The push rod 58 is provided with a treadle 7c portion 61 for the convenient manipulation thereof. Said treadle portion is provided with an extension member 62 which has an upwardly facing surface adapted to unden lie a downwardly facing surface 63 formed upon the treadle portion 38 of the push rod 31. The push rod 31, the actuating lever 41, and the latch dog 413 and their correlated parts have the same relation to eachother in Fig. 3 as hereinbefore described relative to Fig. 1. The hole through which the push rod 58 passes is enlarged and allows lateral movement of said pushrod, and has a connecting por-' tion leading to the hole 39, through which the push rod 31 passes, said extension member 62 working in this connecting portion. The arrangement is such that the extension member 62 may be maintained so that the upwardly facing surface thereof underlies the downwardly facing surface 63 during all the lateral positions of the push rod 31 andsaid push rod 58 may bemoved away from said push rod 31 so that said opposing'surfaces do not overlap. A locking member 64: is secured to the upper surface of the foot board 32 and has an undercut portion 65 which is adapted to be en gaged by the treadle portion 61 when said push rod 58 is in its lower position whereby the tripping mechanism of the second cylin der may be set to trip said cylinder during a number of consecutive cycles, see Fig. 8. A flat spring member 66 is secured upon the locking member 64: and its free end extends therefrom toward said push rod 58, and is so disposed that the treadle portion 61 may be engaged to prevent the push rod 58 from moving toward the push rod 31. The locking member 6-1 and the spring member 66 are so disposed that when the treadle portion 61 of the push rod 58 is engaged with either one of said members the upwardly facing surface of the extension member 62 and the downwardly facing surface 63 of the treadle portion 38 of the push rod 31 do not overlap. Thusthe tripping mechanism of the second cylinder may be main tained out of thecontrol of the trip positioning mechanism of the first cylinder and the same maybemaintained out of such relation in either its untripping relation or its tripping position. i j i Fig. 7 shows the treadle portion 61 of the push rod 58in engagement with the spring member 66 as above described. I

It will be noted that by the above de-. scribed mechanism the operator is enabled to determine the propertime when the positi-oning means of the tripping mechanism should be moved to tripping position in order to trip the cylinder. In fact he is pre vented from either tripping too soon, which ,might otherwise result in the machine being tripped in the cycle before the one in which he intended to trip the machine, or maintaining the trip positioning mechanism in tripping position too long whereby the machine might be tripped in the cycle succeeding the cycle in which he intended to trip the machine. Thus, it is only necessary that-the operator see to it that the pressure is applied to. the push rod 31 as the roller passes over the low portion and until it again regains the high portion of the cam 33. After the machine has been tripped the roller 35 regains the high portion ofthe cam 33 and the push rod 31 is moved upwardly whereby the operator is notified by the sensation ofthe impulse imparting to the trip positioning means by the cam that the machine has been tripped,

A balance weight 67 is aflixed to the push rod 58 and serves to maintain said push rod in such a positionthat the downwardly facing surface 63 and the upwardly facing surface of the extension member 62 overlap one another. I have provided a treadle 68 which is affixed to the arm 13 of the actuating lever 41 whereby the operator may raise the opposite arm of said actuating lever at any time to engage the same with the push rod 31 without necessitating the movement of said sition. v

Wh1le I have shown my invention in conpush rod to its lower or tripping po- .nection with a two couple printing machine,

it will be noted that Fig. 1 shows the same in connection with the first couple of a two couple machine, the means for tripping the second couple being entirely independent of the means for trlpping the first couple, which means it will be noted embodies the main features of my invention, wherefore it is obvious thatthe invention may be used upon either two couple or a single couple machine without changing even the structural detailsof the same.

While I have'herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may be readily made without departing from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters Patent the following:- V v r 1. A printing press including a tripping mechanism, trip positioning means in operativerela-tion therewith and including resilient means adapted to cause said trip posit oning'means to assume untripping position, and timedpress driven means in operative relation with said trip positioning means and adapted to move the same into untripping position after said positioning means has been moved into tripping position and has effected the positioning of said tripping mechanism to trip.

2. A printing press including a tripping mechanism, trip positioning means in operative relation therewith and including resilient means adapted to cause said trip positioning means to assume untripping position, and timed press driven means in operative relation with said trip positioning means and adapted to prevent said positioning means from being moved to tripping position until such time when such movement will be effective to position said tripping mechanism to trip, and adapted to move said positioning means into untripping position after said positioning means has been moved into tripping posit-ion and has eifected the positioning of said tripping mechanism to trip. l

3. A printing press includlng a trlpplng mechamsm, trip positioning means 111 operative relation therewith. for controlling the same and adapted to normally assume untripping position, timed press driven means in operative relation with said trip positioning means, and adapted to move the same into untripping position after said positioning meat '4 has been moved into tripping pos1- tion and has effected the positioning of said tripping mechanism to trip, and yieldable detachable means adapted to be engaged with said trip positioning means to overpower the normal tendency thereof and adapted to move the same to tripping position.

4. A printing press including a tripping mechanism, trip positioning means in operative relation therewith for controlling the.

same and adapted to normally assume untripping position, timed press driven means in operative relation with said trip positioning means and adapted to prevent said positioning n'ieans from being moved to tripping position until such movement will be effective to position said tripping mechanism to trip and adapted to move said positioning means into untripping position after said positioning means has been moved into triphing position and has effected the position ing of said tripping mechanism to trip, and yieldable detachable means adapted to be on gaged with said trip positioning means to overpower the normal tendency thereof and adapted to move the same to tripping position.

5. A printing press including two printing couples, a tripping mechanism in operative relation with each couple, a. trip positioning means for one of said tripping mechanisms and adapted to normally assume nntripping position. timed press driven means in operative relation with said trip positioning means, and adapted to move the same into untripping position after said positioning means ping position operates to cause said second trip PO?) inning means to position its trip- I 1g mechanism to trip.

6. A printing press including two printing couples, a tripping mechanism in operative relation with each couple, a trip positioning means for one of said tripping mechanisms and adapted to normally assume untripping position, timed press driven means in operative relation with said trip positioning means and adapted to prevent said positioning means from being moved to tripping position until such time when such movement will be effective to position said one tripping mechanism to trip and adapted to move said positioning means into untripping position after said positioning means has been moved into trippiiiig position and has efiected the positioning of said tripping mechanism to trip, a second trip positioning means for the other tripping mechanism and means whereby the movement of said first mentioned trip positioning means into tripping position operates to cause said second trip positioning means to position its tripping mechanism to trip.

7. A printing press including two printing couples, a tripping mechanism in operative relation with each couple, a trip positioning means for one of said tripping mechanisms and adapted to normally assume untripping position, timed press driven means in opera tive relation with said trip positioning means, and adapted to move the same into untripping position after said positioning means has been moved into tripping position and has effected the positioning of its trip ping mechanism to trip, a second trip positioning means forthe other tripping mechanism, and means whereby the movement of said first n'ientioned trip positioning means intotripping position operates to cause said second trip positioningvmeans to position its tripping mechanism to trip. and detachable yieldable means adapted to be engaged with said first mentioned trip positioning means to overpower the normal tendency thereof and adapted to move the same to tripping position.

8. A printing press including two printing couples, a tripping mechanism in operative relation with each couple, a trip positioning means for one of said tripping mechanisms and adapted to normally assume untripping position. timed pressdriven means in operative rel :1 tion with said trip positioning means and a pted to prevent said positioning am being moved to tripping position u i nch time when such movement will be etiecti to position "saidone trippingmecha nism to trip andadapted to move said post tioning means into. untripping position after said positioning means has been moved into tripping position and has effected the positioning or said tripping mechanism to trip, a second trip positioning means for the other tripping mechanism, and means whereby the movement of said first mentionedtrip positioningmeans into tripping position oper: ates to cause, said second trip positioning means to position its tripping mechanism to trip, and detachable yieldable means adapted to be engaged with said first mentioned trip positioning means to overpowerthe normal tendency thereof and adapted to move the same totripping position.

9. A printing press including two printing couples, each printing couple'including a movable element adapted to be moved into and out of printing relation with its comple in entaryprintingg; element, a trip ping mecha nism for each of said couples in operative re lation with it s respective movable element, a positioning means for each tripping mecha nism in operative relation with its respective tripping mechanism, a press driven timing means in operative relatlonl withthe positioningmeans of. one OfSZLlCl trlpping mecha- 11isins,and adapted to move said positioning means into untripping position after said positioning means has been moved to tripping position and after such movement has efiected the positioning of said tripping mechanism to trip said movable element of that couple, and a connecting element be tween said positioningmeans of theseveral couples whereby said positioningmeans of the other couple is moved to tripping positionwhen said one positioning means isso moved. i

ing couples,each printing ooupleincluding a movable element adapted to be moved into and out of printing relationwith its complementary printing element, a tripping mechanism for each of said couples in operative relation with its respective movable element, a positioning means for each trip- .1 plng mechanism in operative relatlon jWlth i 10. A printing press including two print the movement of said positioning means has efiected the positioning of said tripping mechanism to trip said movable element and a c'onneotingelement between said positioning' means of the several couples whereby said positioning means of the othercouple is moved to tripping position when said one positioning means is so moved.

11? A' printing press including two printing couples, each printing coupleincluding a movable element adapted to be moved into and out of printing relation with its complementary printing element, a tripping mechanism for each of said couples in operative relation with its respective movable element, a positioning means for each tripping mechanism in operative relation with its respective tripping mechanism, a press driven timing means in operative relation with the positioning means of one of said tripping mechanisms, and adapted to prevent said positioning means from being moved to tripping position until such time when such movement will be effective to po sition said tripping mechanism to trip said movable element of thatcouple, a connecting element between said positioning means of the several couples whereby said positioning means of the other couple is moved totripping position when said one positioning means is so moved, and detachable yieldable means for moving said positioning means of said one couple into tripping position.

12. A printing press including two printing couples each printing couple including a movable element adapted to be moved into and out of printing relation with its complementary printing element, a tripping mechanism for each of said couples in operative relation with its respective movable element, a positioning means for each tripping mechanism in operative relation with its respective tripping mechanism, a press driven timing means in operative relation with the positioning means of one of said tripping mechanisms and adapted to move said positioning means into untripping position after said positioning means has been moved to tripping position and after such move ment has effected the positioning of said tripping mechanism to trip said movable element of that couple, a connecting element between said positioning means of the several couples whereby said positioning means of the other couple is moved to tripping position when said one positioning means is so moved, and detachable yieldable means for moving said positioning means of said one couple intotripping position.

13. A printing press including two printing couples, each printing couple including a movable element adapted to be moved into and out of printing relation with its come plementary' printing element, a tripping mechanism for each of said couples in oper-' ative relation with its respective movable element, a positioning means for each tripping mechanism in operative relation with its respective tripping mechanism, a press driven timing means in operative relation withthe positioning means of one of said tripping mechanisms, adapted to time the movement of said positioning means into tripping position and to move said position provided with a ing means into untripping position after the movement of said positioning means has effected the positioning of said tripping mechanism to trip said movable element, a connecting element between said positioning means of the several couples whereby said positioning means of the other couple is moved to tripping position when said one positioning means is so moved, and detachable yieldable means for moving said positioning means of said one couple into triping position.

14L. A foot control comprising a longitudinally movable push rod adapted for limited lateral movement, yield'able means for normally maintaining the same at one end of its longitudinal movement, said push rod having a surface facing in the direction of its normal position, and yielda'ble actuating means adapted to exert influence in a direction opposed to the direction of influence of said first mentioned yieldable means and having a relatively greater force than said first mentioned yield able means and having a surface opposing said first mentioned surface and disposed in the path thereof and engageable therewith when said push rod is moved to one position in its lateral movement.

15. A foot control comprising a longitudinally movable push rod adapted for limited lateral movement, yielda-ble means for normally maintaining the same at one end of its longitudinal movement, said push rod having a. surface facing in the direction of its normal position, said push rod also being surface facing in a direction opposite to said first mentioned surface, a second push rod adapted for limited longitudinal movement in a direction substantially parallel to the longitudinal movement of said first mentioned push rod and adapted for limited lateral movement and having a surface opposing said last mentioned surface and engageable therewith in all the lateral movements of said first mentioned push rod and disengageable therewith by the lateral movement of said second mentioned push rod, yielda-ble means for norn'rally maintaining said second push rod at that end of its long movement corresponding With the normal position of said first mentioned push rod, and yieldable actuating means adapted to exert influence in a direction opposed to the direction of influence of said first and second mentioned yieldable means and having a relatively greater force than the combined force of said first and second mentioned yieldable means and having a surface opposing said first mentioned. surface and disposed in the path thereof and engageable therewith when said push rod is moved to one position in its lateral movement.

16. A printing press including two printing couples operating sequentially in printing, each printing couple including a movable element adapted to be moved into and out of printing relation with its complementary printing element, a tripping mechanism for each of said couples in operative relation with its respective movable element, a positioning means for each tripping mechanism in operative relation with its respective mechanism, a timed press driven actuating means included in the trip positioning means of the second couple adapted to move its trip positioning means to tripping position to trip said second couple, a coupling means included in the trip positioning means of the second couple adapted to be moved to render said timed press driven actuating means operative relative to its trip positioning means, a press driven timing means in operative relation with the positioning means of the first couple, and adapted to move said positioning means into untripping position after said positioning means has been moved to tripping position and after such movement has elfected the positioning of said tripping mechanism to trip said movable element of that couple, and a connecting element between said positioning means of the trip positioning means of the first couple and said coupling means whereby said coupling means is moved to render said press driven actuating mean operative when said positioning means of the rst couple is moved to tripping position.

17. A printing press including two printing couples operating sequentially in printing, each printing couple including a movable element adapted to be moved into and out of printing relation with its complementary printing element, a tripping mechanism for each of said couples in operative relation with its respective movable element, a positioning means for each tripping mechanism in operative relation with its respective tripping mechanism, a timed press driven actuating means included in the trip positioning means of the second couple adapted to move its trip positioning means to tripping position to trip said second couple, a coupling means included in the trip positioning means of the second couple adapted to be moved to render said timed press driven actuating means operative relative to its trip positioning means, a press driven timing means in operative relation with the positioning means of the first couple, and adapted to time the movement of said positioning means into tripping position and to move said positioning means into untripping position after the movement of said positioning means has effected the positioning of said tripping mechanism to trip said movable element and a connecting ele ment between said positioning means of the trip positioning means of the first couple and said coupling means whereby said coupling means is moved to render said press driven actuating means operative when said positioning means is moved to tripping position.

18. A printing press including two printing couples operating sequentially in printing, each printing couple including a movable element adapted to be moved into and out of printing relation with its complementary printing element, a tripping mechanism for each of said couples in operative relation with its respective movable element, a positioning means for each tripping mechanism in operative relation with its respective tripping mechanism, a timed press driven actuating means included in the trip positioning means of the second couple adapted to move its trip positioning means to tripping position to trip said second couple, a coupling means included in the trip positioning means of the second couple adapted to be moved to render said timed press driven actuating means operative relative to its trip positioning means, a press driven timing means in operative relation with the positioning means of the first couple and adapted to move said positioning means into untripping position after said positioning means has been moved to tripping position and after such movement has effected the positioning of said tripping mechanism to trip said movable element of that couple, a connecting element between said positioning means of the trip positioning means of the first couple and said coupling means whereby said coupling means is' moved to render said press driven actuating means operative when said positioning means is moved to tripping position, and detach able yieldable means for moving said positioning means of said first couple into tripping position.

19. A printing press including two printing couples operating sequentially in print ing, each printing couple including a movable element adapted to be moved into and out of printing relation with its complementary printing element, a tripping mechanism for each of said couples in operative relation with its respective movable element, a positioning means for each tripping mechanism in operative relation with its respective tripping mechanism, a timed press driven actuating means included in the trip positioning means of the second couple adapted to move its trip positioning means to tripping position to trip said second couple, a coupling means included in the trip positioning means of the second couple adapted to be moved to render said timed press driven actuating means operative relative to its trip positioning means, a press driven timing means in operative relation with the positioning means of the first couple, adapted to time the movement of said positioning means into tripping position and to move said positioning means into untripping position after the movement of said positioning means has effected the positioning of said tripping mechanism' to trip said movable element, a connecting element between said positioning means of the trip positioning means of the firstcouple and said coupling means Where- Oooies of this patent may be obtained for by said coupling means is moved to render said press driven actuating means operative when said positioning means is moved to tripping position, and detachable yieldable means for moving said positioning means of said first couple into tripping'position.

' In testimony whereof, I afiix my signature this 3rd day of November, A. D. 1917.

ROBERT MIEHLE.

five cents each, by addressing the "Commissioner of Patents, Washington, D. 0.

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