US1365315A - Guard for presses - Google Patents

Description

S. C. GOETTEL. GUARD FOR PRESSES.

APPLICATION FILED JUNE 9. m9.

Patented Jan. 11, 1921.

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GUARD FOR PRESSES.

I APPLICATION FILED JUNE 9, 1919. 1,365,315. I Patented Jan. 11, 1921 3' $HEETSSHEET 2.

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APPLICATION FILED JUNE 9. {9H}.

Patented Jan. 11,1921.

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UNITED. STATES PATENT ()FFlCE.

SAMUEL C. GOETTEL, 0E CINCINNATI, OHIO.

GUARD FOR PRESSES.

Specification of Letters Patent.

Patented Jan. 11, 1921.

Application filed June 9; 1919. Serial No. 302,934.

To all whom it may concern Be it known that I, SAMUEL C. G'on'rrnn, v

My invention relates to guards for preventing injury of operators and others by machinery and more specially to guards of this character on printing presses and embossing'presses and the like.

he very readily attached to any usually constructed press of ms kind and which will be very effective in operation to keep the operators hands out from between the platen and the form or die or the like when these approach, and to avoid injury to the hands by the guard itself.

My invention consists in the combination of parts and in the details of construction and arrangement of parts as will hereinafter be more fully described and claimed.

In the drawings:

Figure 1 is a partial side elevation of a printing press of well. known construction having my invention applied thereto and showing the positions of the parts when the platen. and form are about to conie together,

and showing. by dotted lines. the hand and arm of the operatorto illustrate how the device acts thereon;

Fig. 2 is a similar-view but with the press in feeding position and showing the hand of the operator by dottel lines, in

the act of feeding the press. to illustrate the free access which the device'affords to the hand of the operator when the press is in this position; I

F 3 is a plan view of front parts. of the press and my invention applied theretoa Fig. 4 is av front elevation of the device embodying my inventiondetaclied from the press and with the press impression screws indicated by dotted. lines and the triggers shown in section;

Fig. 5 is a detail perspective view of one of the Fig. 6 is a similar view'of one of the brackets Fig. 7 is a similar view of one of the rods; F g. 8 is an enlarged top end view of the rod;

Fig. 9 is a perspective view of'part of a different kind of printing or embossing press and showing parts of a device embodying a modification of my invention as applied to such a press;

Fig. 10 is a partial side elevation of a heavy embossing press with another modification of my invention applied thereto the positions of the parts during approach to i printing or embossing position being indi- The object of my invention is to provide a very simple device of this kind which may cated by dotted lines Fig. 11 is a partial front elevation of the same; I

Fig. 12 is a perspective view of this modified device detached from the press; and

Fig. 13 is a cross section on a plane corresponding to the line 1313 of Fig. 12.

As shown in Figs. 1 to 6, inclusive. the printing press of a well known make has the swinging bed 1, carrying the form 2. and drawn forward under the action of the main shaft 3 at the front through the medium of side arms 4 connected to the bed 1 and to the wheel 5 on the main shaft 3, which wheel 5 carries on its inner face the cam 6 that tilts the rocker-7 through the medium of the rocker arm 8. As is well known in this kind of press the tilting of the rocker has such relation to the swinging of the bed 1 that the rocker brings the platen 9 into printing position just before the form 2 reaches it. andso that the platen is tilted up for ready removal and insertion of the work during another and greater part of the rotation of the wheel Other details are concerned in the operation of the press, but what has beendescribed is suilicient for e plaining my invention.

As is well known iii-this and other kinds of presses, the platen?) is carried on the rocker 7 by four impression screws 10 which are screwed into bosses in the platenor its bridge piece and are screwek'l intoears 11 forming parts of the rocker 7. with lockplaten is assured. The rocker 7 has trunnions in bearings 13 in the side frames 14 of the press; being held in these bearings by caps or boxes 15 held to the frame 1 1 by cap screws 16 above and below.

My improved guard, as applied to the press of this construction, comprises brackets 17. Each one of these brackets 17 is made of heavy sheet metal and comprises a straight upright part 18 (Fig. 6) with lugs 19 and 20 at its upper and lower ends respectively, bent out horizontally, with alined holes 21. This part 18 of each bracket is to be held at a respective end of the back part of the platen or bridge near the top thereof. From the front of this part 18 the bracket is curved in toward the middle of the press and forwardly thereof and has, at its front end substantially at right angles to the front end part, an car 22, having cut in from its free end down near its bottom a horizontal slot 23. These brackets are attached to the press by loosening the lock-nuts 12 on the upper impression screws 10 and slipping the ears of the respective brackets in behind these nuts 12 with the screw 10 received in the slot 23. The bracket is adjusted horizontally so that it clears adjacent parts of the press when swinging along with the rocker and platen, and then the nuts 12 are tightened to hold these brackets firmly and also continue to act as lock nuts for the screws 10. These brackets may be thus attached without disturbin the impression adjustment of the parts if the nut 12 of only one of the screws 10 is loosened at a time. That is, the mounting of one bracket should be completed before-beginning the mounting of the other bracket; so that there will always be one securely held impression screw for the upper part of the platen.

The triggers 2 1 are fixed to the frame of the press at opposite sides of the rocker and platen. Each trigger is made of heavy sheet metal and comprises a bearing part (Fig. 5) in the shape of an angle-bar running from front to rear of the press with the upper member of the bar extending outward away from the platen, and a forwardly upwardly inclined part 26, having on its front end an ear 27 bent substantially at right angles to it, to stand upright, and having a downwardly opening slot 28. These triggers 2a are mounted by loosening the upper cap screw 16 of the rocker bearing and slipping the ear of the respective trigger down behind the head of the screw 16 with the slot 28 receiving the screw. Then the cap screw right and left ends of the platen and bridge and has depending rods 30 fixed in it near its end parts and extending down through the alined holes 21 in the lugs 19 and 20 of the respective brackets. Below the lower lugs 20 these bars 30 are bent horizontally outward to form feet 31 that bear down on the tops of the bearing parts 25 of the respective triggers 24:.

Preferably these rods 30 are attached to the cross bar 29 so that they may be adjusted therealong transversely of the press to accurately fit this part of the device to the brackets 17 so that it will slide freely up and down therein. As here shown, the upper end of each rod 30 has the reduced upwardly extending threaded part or stud 32 (Figs. 7 and 8) and, at the junction of this part 32 with the main part of the rod, parallel straight sides 33 are out on the rod, which fit in longitudinal slots 34 (Fig. 3) in the horizontal member of the cross bar 29 near the respective ends thereof. Cap-nuts 35 screw down on the studs 32 and clamp the rods 30 firmly to the cross bar 29 once the proper adjustment has been made. The parallel straight sides 33 fitting the slots 3a prevent the rods 30 from turning in the cross bar 29 and keep the feet 31 of the rods 30 extending laterally outward across the bearing parts of the triggers as before described.

Light tension springs 36 have their upper ends connected to the depending member of the cross bar 29 in small holes therein near opposite ends thereof and have their lower ends connected to the respective brackets 17 through small holes 36 in said brackets adj acent to the lower lugs 20 of said brackets.

hen the rocker and platen tilt up for taking off and feeding they move upwardly and forwardly relatively to the trigger 2 1 This allows the springs 36 to pull the cross bar 29 down close to the upper edge of the platen entirely out of the way of the operator. When the rocker and platen swing downwardly into position to receive the impression their downward movement relatively to the trigger 24: causes the cross bar 29 to be pushed up due to the engagement of the feet 31 of the rods 30 with the bearing part 25 of the trigger; this upward movement stretching the springs 36 which will then pull the cross bar 29 and rods 30 downward at the next upward and forward tilting of the rocker and platen. The just described upward movement of the bar 24 begins along with the downward movement of the rocker and platen and becomes more rapid as the parts move more nearly at right angles to the bearing part 25 of the trigger; so that by the time the bed 1 and form 2 have come near enough to the platen to endanger the hand of the operator, should it be between them, the cross bar will have risen so high that the hand in any such position will be pushed up entirely away from the space be tween the platen and form as clearly indicated in Fig. 1.

Should the operators hand get under the cross bar 29 this bar will then also effectively prevent access of the hand to the dangerous space; and if the hand is caught under this cross bar 29 between it and the upper edge of the platen or bridge during the upward and forward'tilting of the parts there can be no serious injury to the hand because this cross bar is moving downward under no more force than that due to its own weight and the relatively light pull of the springs 36 thereon.

Fig 9 shows part of a printing or embossing press wherein the side arm 4: is not spaced so far laterally outwardly from the rocker 7 and platen 9. In this kind of a press the bed is generally stationary and the side arm a, connected to a suitable crank in the bed part of the press, acts in combination with other mechanism to tilt the rocker 7 and platen 9 toward the form and bring the platen squarely against the form. The construction of such presses be ing well known it is deemed sufii'cient to merely illustrate the relation of the side arm l to the rocker 7 and platen 9 and the impression screw 10 entering the car 11 of the rocker 7 and having the lock-nut 12. It will be understood that these details are the same at the other side of the press and that another side arm l has the same position relative to them.

On this kind of press the feet 31 of the rods 30 engage with the upper sides of the side arms or connecting rods 4'; thus dispensing with the triggers 24 of the preceding example. The bracket 17 is similar to that of the preceding example but generally need not be so long nor so much oil-set; it usually comprising merely the part 22 having the slot 23' and the upright part 18 directly joining the part 22 and having the upper and lower lugs 19 and 20 with the openings 21 through which the rod 30 slides up and down. This, bracket is mounted by clamping it with the lock-nut 12 with the impression screw 10 received in the slot 23. The cross bar 29 will be understood to be as in the preceding example and attached to the rods 30 in the same way to permit transverse adjustment of the rods to the bar; which, together with the transverse adjustment of the brackets 17' as permitted by their horizontal slots 23, makes it very convenient to fit the apparatus to practically any press of this kind. The bar 29 is pulled down by springs at each side such as the spring 36 in Fig. 9 which is hooked to the cross bar 29 and to the bracket 17 near the lower lug 20' thereof in a hole 36.

Another press, which is similar to that of Fig. 9 in having the platen movable to a stationary bed and having the side arms at close to the platen at each side, is parttially illustratedin Figs. 10 and 11. This is a heavy embossing press; although it will be understood that the particular modification of my invention exemplified therewith is not peculiar to heavy presses nor presses used only for embossing.

My invention as applied to this press of .Figs. 10 and 11 is similar to the example of Fig. 9 in that the rods 30 engage directly with the upper sides of the side arms 4.

The complete equipment according to this example is clearly shown in Fig. 12'. These rods 30 slide up and down through bracket blocks 17 which are screwed to the opposite lateral edges of the rocker 7. The up per ends of the rods 30" have heads 37 and a round cross bar 29 has its ends fixed to'these heads 37 by set screws 38 in the heads. Coiled tension springs 36" have their upper ends connected to respective heads 37 by screws 39 and their lower ends connected to respective blocks 17 by screws s0. These pull the cross bar 29 down when the rocker 7 and platen 9 swing upwardly and forwardly; and yield to permit the cross bar 29 to rise above the platen at it swings into impression-making position under the action of the side arms a" and other mechanism on the rocker 7". The details of this other mechanism being well known in such presses need not be particularly described herein.

The device of this example of Figs. 10 and 11, so far as described, will constitute an effective guard for this kind of press just as in the other examples. However, I prefer to illustrate in connection with this kind of press additional mechanism in such a guard. This comprises a shutter 41 preferably made of sheet metal and pivoted'on the round cross bar 29 to swing down or to swing rearwardly and upwardly across the space between the platen 9 andthe form or die 2 as the platen approaches these. This shutter 41 extends almost the entire length of the bar 29 between the heads 37 of the rods 30 and is preferably attached to the bar 29 by means or" hubs l2 at its ends and at its middle around which hubs it extends about half way and to which it is fixed by screws 43 (Fig. 13). This shutter 41 has the recesses 44 extending in from its free edge in the proper positions to receive the clamps 5 at the top of the bed when this shutter swings closely over said top. The parts of this free edge. of the shutter 41 not-removed in forming the recesses i l preferably have the rounded beads 46 therealong to present a smooth surface which will not injurethe hands of the op erator or other objects coming in contact therewith.

This shutter 41 lies down behind the upper part of the platen and its rocker when these are tilted forwardly. Until the cross bar 29" has risen a considerable distance above the top of the rocker and platen the rearward and upward swinging of the shutter 41 would be prevented by the shutter engaging said top. I therefore provide the means for swinging this shutter rearwardly and upwardly in such a way that it will not act until the shutter has been carried high enough to clear said top. As here shown it consists of a rod 47 connected by a turn-buckle -18 to an eye-bolt 419 which is connected to another eye-bolt 50 fixed in one of the end hubs 1-2 of the shutter. This rod 17 extends down the front of the rocker 7 through an eye-bolt 51 fixed in said front and the lower end of the rod 47 has a head 52 which will not pass through the eye-bolt 51. This head 52 is far enough below the eye-bolt 51 when the parts are in their lowered positions so that it will not engage with said eye bolt 51 until the parts have risen far enough for the shutter to clear the top of the rocker as before mentioned. By means of the turn-buckle 18 the length of this connection may be adjusted so that this engagement will occur just as soon as is practicable after this raised position has been reached and thereby swing the shutter across the dangerous space as promptly as pos sible. For accelerating the return downward swinging of the shutter as the parts swing forwardly after the impression, I prefer to provide a coiled spring 53 around the cross bar 29 inside the bent-around part of the shutter with one end 5 1 fixed in one of the end hubs 12 and the other end fixed by means of a screw 55 to the cross bar 29". Swinging of the shutter 41 thus twists this spring, and the spring in resuming its normal condition returns the shutter downwardly very quickly as the head 52 of the rod 47 recedes downwardly from the eyebolt 51.

This shutter provides a still more effective barrier against protrusion of the operators hand between the platen and the form or die.

It will be seen that the device constructed according to any of the examples is very readily attached to the press and no great skill is required for its proper adjustment; and when once properly adjusted it will not readily get out of adjustment. The comparatively light pressure required to operate it makes it feasible to utilize very simple fastening means such as the clamping of the parts under the regular lock-nuts or screw-heads of the press. When these are drawn up as tight as they must be to perform their normal functionsin the press they will effectively prevent any movement of the parts of my invention out of their correctly adjusted position under the normal strains incident to their operation.

While certain examples of my invention are shown with certain respective examples of presses it will be understood that any example of my invention is applicable to any one of the presses; and by minor modifications my invention of any of the examples is applicable to practically any printing press, embossing press or the like, and will effectively function in the desired manner in connection with the operation of any such press or other machine of that kind. By having the parts of the device adjustable the variety of makes and sizes of machines to which any given outfit is applicable is considerably increased as is also the ease with which the outfit may be applied to any given machine.

While certain constructional details are deemed preferable in connection with my invention, and I have shown and described these rather specifically in elucidating the construction and use of my invention, as is required, I do not wish to be understood as being limited to such precise showing and description, but having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In combination with a platen and an impression screw therefor and a lock nut for said screw, a bracket clamped by said lock nut and having guide means near one side of said platen, a guard element guided by said guide means, to move toward or from said platen, and means causing said guard element to move away from said platen upon movement of said platen toward pressing position.

2-. In combination with a platen, its rocker, an impression screw holding said platen to said rocker, a lock nut for said impression screw, a bearing for said rocker, and a cap screw for said bearing, a bracket clamped by said lock-nut and having guide means near one side of said platen, a trigger clamped by said cap screw and having a bearing part near said guide means, and a guard element guided by said guide means and. bearing upon said trigger bearing part to be moved away from said platen upon movement of said platen toward pressing position.

8. In combination with a platen, its rocker, an impression screw holding said platen to said rocker, a lock nut for said impression screw, a bearing for said rocker, and a cap screw for said bearing, a bracket clamped by said lock nut and having guide means near one side of said platen, a trigger clamped by said cap screw and having a bearing part-near said guide means, a guard element guided by said guide means and bearing upon said trigger bearing part to be moved away from saidplaten upon movement of said platen toward pressing position, and yieldable means to return said guard element toward said platen upon return of said platen "from pressing position.

4. In combination with a platen, its rocker, an impression screw holding said platen to said rocker, a lock nut for said impression screw, a bearing for said rocker, and a cap screw for said bearing, a bracket clamped by said lock nut and having guide means near one side of said platen, a trigger clamped by said cap screw and having a bearing part near said guide means, a rod sliding in said guide means and bearing upon said trigger bearing part, and a guard element attached to said rod to lie along said platen'and be moved awayfrom said platen by said rod upon movement of said platen toward pressing position.

5. In combination with a platen, its rocker, an impression screw holding said platen to said rocker, a lock nut for said impression screw, abearing for said rocker, and a cap screw for said bearing, a bracket clamped by said lock nut and having guide means near one side ofsaid platen, a trigger clamped by said cap screw and having a bearing part near said guide means, a rod sliding in said guide means and bearing upon said trigger bearing part, a guard element attached to saidrod tolie along said .platen and be moved away from said platen by said rod'upon movement of said platen toward pressing position, and yieldable means to return said guard element toward said platen upon return of said platen from pressing position.

6. In combination with a movable press element, a guard element adapted to lie along the upper part of said press element, means at opposite lateral sides of said press element to causesaid guard element to move away from said press element upon movement of said press element toward pressing position, and means for adjusting said guard element and said means relatively to each other laterally of said press element.

7. In combi'nationwith a platen andi'mpression screws near respective lateral sides thereof and lock nuts for saidscrews,brackets clamped by'theres'pective lock nuts and having guide means near .respective lateral sides of said platen,-rods sliding in the 'respective guidemeans, a guard element lying along the upper partof: said platen and having its opposite end parts attached to said rods, and means upon whichsaid rods bear upon movement of: said platen-toward pressing position, wherebysaid rods :move said guard elementawayfrom said platen during said'moveme'nt of said platen.

8. In combination with a platen and impression screws near respective lateral sides thereof and lock nuts for said screws, brackets clamped by the respective lock nuts and having guide meansnear respective lateral sides of said platen, rods sliding in the respective guide means, a guard element lying along the upper part of said platen and having its opposite end parts attached to said rods, means upon which said rods bear upon movement of said platen toward pressing position, whereby said rodsmove said guard element away from said platen during said movement of said platen, and springs connected to the respective brackets and to respective end parts of said guard element to return said guard element toward said platen upon return of said platen from pressing position.

9. In combination with a platen and its rocker, impression screws holding said platen to said rocker, lock nuts :for the respective screws, bearings for said rocker at opposite lateral sides thereof and cap screws for the respective bearings, brackets clamped by the respective lock nuts and having guide means near respective opposite lateral sides of said platen, triggers clamped by the respective cap screws and having bearing-parts near the respective guide means, rods sliding in the respective guide means and bearing upon the respective trigger bearing-parts, and a guard element lying along the upper part of said platen and having its opposite end parts attached to said rods to be moved away from said platen by said rods upon movement of said platen toward pressing position.

10. In combination with a platen and its rocker, impression screws holding said platen to said rocker, lock, nuts for the respective screws, bearings for said rocker at opposite lateral sides thereof and cap screwsfor the respective bearings, brackets clamped by the respective lock nuts and having guide means near respective opposite lateral sides of said platen, triggers clamped by the respective cap screws and having bearingparts near the respective guide means, rods sliding in the respective guide means and bearing upon the respective trigger bearingparts, and a guard element lying along the upper part of said platen and having its opposite end parts attached to said rods to be moved away from said platen by said rods upon movement of said platen toward pressing position, said brackets having horizontal slots receiving said impres sion screws where said brackets are clamped by said lock nuts, whereby said brackets are adjustable laterally relatively to said triggers. I

11. In combination with a platen and its rocker, impression screws holding said platen to said rocker, lock nuts for the respective screws, bearings for said rocker at opposite lateral sides thereof and cap screws for the respective bearings, brackets clamped by the respective lock nuts and having guide means near respective opposite lateral sides of said platen, triggers clamped by the respective cap screws and having bearing-parts near the respective guide means, rods sliding in the respective guide means and bearing upon the respective trigger bearing-parts, and a guard element lying along the upper part of said platen and having its opposite end parts attached to said rods to be moved away from said platen by said rods upon movement of said platen toward pressing position, said guard ele ment having slots through which it is at tached to said rods as aforesaid, whereby said rods and brackets are adjustable laterally relatively to said guard element.

12. In combination with a platen and its rocker, impression screws holding said platen to said rocker, lock nuts for the respective screws, bearings for said rocker at opposite lateral sides thereof and cap screws for the respective bearings, brackets clamped by the respective lock nuts and having guide means near respective opposite lateral sides of said platen, triggers clamped by the respective cap screws and having bearingparts near the respective guide means, rods sliding in the respective guide means and bearing upon the respective trigger bearingparts, and a guard element lying along the upper part of said platen and having its opposite end parts attached to said rods to be moved away from said platen by said rods upon movement of said platen toward pressing position, said brackets having horizontal slots receiving said impression screws where said brackets are clamped by said lock nuts, whereby said brackets are adjustable laterally relatively to said triggers, and. said guard element having slots through which it is attached to said rods as aforesaid, whereby said rods and brackets are adjustable laterally relatively to said guard element.

18. In combination with a movable press element, a guard element lying along said press element, mounted to slide away from said press element and to swing over said press element in pressing direction, and means to first slide said guard element and then swing said guard element as aforesaid,

upon movement of said press element toward pressing position.

14. In combination with a movable press element, a. guard element lying along said press element, mounted to slide away from said press element and to swing over said press element in pressing direction, means to first slide said element and then swing said element as aforesaid, upon movement of said press element toward pressing position, yieldable means to swing said guard element from over said press element, and yieldable means to return said guard element toward said press element, upon return of said press element from pressing position.

15. In combination with a movable press element, a rod slidable. up and down on said press element, a guard element pivoted to said rod and lying along the top or said press element, a tension element connected to said guard element, engaging means on said press element, engaging means on said tension element engaging with the engaging means on the press element to cause swinging of said guard element, after initial upward sliding of said rod, and means to cause said rod to slide up when said press element moves toward pressing position.

16. In combination with a movable press element, a rod slidable up and down on said press element, a guard element pivoted'to said rod and lying along the top of said press element, a tension element connected to said guard element, engaging means on said press element, engaging means on said tension element engaging with the engaging means on the press element to cause swinging of said guard element, after initial upward sliding of said rod, and means to cause said rod to slide up when said press element moves toward pressing position, said guard element lying below said top of said press element during said initial upward sliding, and then being swung over said top upon engagement of the aforesaid engaging means after said initial sliding.

17 In combination with a movable press element, a rod slidable up and down on said press element, a guard element pivoted to said rod and lying along the top of said press element, a tension element connected to said guard element, engaging means on said press element, engaging means on said tension element engaging with the engaging means on the press element to cause swinging of said guard element, after initial upward sliding of said rod, means to cause said rod to slide up when said press element moves toward pressing position, and yieldable means to swing said guard element in return direction and yieldable means to slide said guard element down, upon return of said press element from pressing position.

18. In combination with a movable press element, a rod slidable up and down on said press element, a guard element pivoted to said rod and lying along'the top of said press element, a tension element connected to said guard element, engaging means on said press element, engaging means on said tension element engaging with the engaging means on the press element to cause swinging of said guard element, after initial upward sliding of said rod, means to cause said rod to slide up when said press element moves toward pressing position, said guard element lying below said top of said press element during said initial upward sliding, and then being swung over said top upon engagement of the aforesaid engaging means after said initial sliding, and yieldable means to swing said guard element from over .said press element and 10 yieldable means to slide said guard element down, upon return of said press element from pressing position.

SAMUEL C. GOETTEL. Witnesses V CLARENCE PERDEW, JAMES N. RAMSEY.

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