US1938725A

US1938725A - Cutting and creasing machine

Info

Publication number: US1938725A
Application number: US637608A
Authority: US
Inventors: Frederick W Seybold
Original assignee: Harris Seybold Potter Co
Current assignee: Harris Corp
Priority date: 1932-10-13
Filing date: 1932-10-13
Publication date: 1933-12-12
Anticipated expiration: 1950-12-12

Description

CUTTING AND CREASING MACHINE Filed Oct. 13, 1932 2 Sheets-Sheet l Arme/veg@ Det; 12, 1933. F w SEYBQLD 1,938,725

CUTTING AND CREASING MACHINE A r roe/v5 Ys Patented Dec. 12, 1933 UNITED STATES CUTTING AND CREASING MACHINE Frederick W. Seybold, Dayton, Ohio, assigner to Harris, Seybold, Potter Company, Cleveland, Ohio, a corporation of Delaware Application October 13, 1932. Serial No. 637,608

13 Claims.

This invention relates to f improvements in cutting and creasing machines, `that is to say machines or presses for cutting or creasing or for cutting and creasing sheet material of various kinds. In some of its aspects the present invention is in the nature of an improvement upon my copending application, Serial No. 624,- 969, led July 27,1932.

One of the objects of the invention is the proo vision of means for relieving the pressure between the movable elements of the press on the return or ,non-working stroke.

Another object is the provision of means for withdrawing the forward paper stops when the 15 parts are in position to deliver the sheet, in order that the stops may not interfere with such delivery. p

Other objects and features of novelty will appear as I proceed with the description of that embodiment of the invention which, for the purposes of the present application, I have illustrated in the accompanying drawings, in which Figure 1 is a side elevational View or" a machine or press embodying the invention, certain portions being broken away to better disclose the internal construction. f

Fig, 2 is an end view of the machine with certain parts shown in section.

Fig. 3 is a diagrammatic view of the toggle joint mounting for one end of the arcuate platen, and

Fig. 4 is a detail elevation of the combined paper stop and gripper.

In the drawings, the machine base is indicated at lO. Upon it are mounted the frame side members 11, which preferably are castings of heavy construction. The upper edges of these castings are preferably inclined to the horizontal as illustrated in Fig. 1. On their inner faces these frame side members are provided with Ways 12 which receive slide blocks 13. In the latter blocks I mount heavy pins 14 upon which are supported a head 15, that is thus mounted to slide back and forth in the inclined ways 12. In its lower face the head 15 is adapted to receive a die 01 dies or a plurality of cutting blades or creasing elements assembled and positioned to perform the particular operation desired.

A short distance above the base 10 I mount in the side members 11 of the .frame a heavy shaft 16, which oscillates in its bearings. Upon it, and just within the sides 11 are mounted sector shaped legs 17 of an arcuate table, these legs being keyed or otherwise secured to the shaft l5. At their upper ends they carry arcuate toothed sectors 19, which are formed with a radius of curvature having its center in the axis of shaft 16. These gear sectors mesh with racks 20 that are secured to the head 15, and Yby this 60 means the head and table are operatively interconnected or intergeared, so that the movement of one imparts a corresponding movement to the other.

The arcuate table comprises an arcuate platen 2l which is hinged to the table legs 17 at one end, as indicated at 22. The upper surface of this platen is formed as a segment of a cylinder, the radius of which is equal substantially to the distance between the lowersurface of 7G head 15 and the axis of shaft 16. The platen is adapted to cooperate with the head for pressing sheet material against the head or thevdie supported therein,.in order to enable the die to eifect the desired cutting or creasing operation.

It is not necessary that this pressure be exerted 'onthe return stroke however, and in order to relieve the machine of this strain and to conserve power I mount the forward rend of ,the platen Ato move inward and outward a short distance indicated at a in Fig. 3. This movement may be accomplished in diiferent ways, but I prefer that disclosed in the drawings herein, where I employ toggle joints at each side of the forward end of the platen, these toggles being maintained in their straightened condition on the Working stroke and being broken on the return stroke. The toggles are of the same construction, and one only will be described. It includes a toggle link 23 mounted on the end of a 9.0 trunnion 24 which has bearing in the platen. The other toggle link 25 is mounted on a trunnion 26 which has bearing in the table leg 17. The inner ends of the two trunnions are provided with curved sockets for. the .reception of a roller ,27 which constitutes the Vcenter pin of the toggle. 28 and 29 are set screws ,mounted upon the leg 17 which are adapted to engage one side or the other of the toggle link 25 and thereby act as stops to limit the movements of the toggle.

The arcuate table swings through an angle of approximately 60. When it approaches the limit of its movement toward the left, as viewed in Fig. 1, the roller 27 encounters stop 30, which is fixed upon the frame 11 near the base of the 105 machine, and the toggle is thereby broken, the center lines of the

links

23 and 25 moving to the positions indicated by the lines b and c in Fig.

f 3, and the platen being thereby swung upon its trunnions 22 so as to be withdrawn out of its 110 tangent relationship with the sliding head, thereby relieving the pressure between the platen and head on the return stroke of the machine. When the platen approaches the limit of its motion toward the right, as viewed in Fig. 1, the toggle being then in its broken condition, roller 27 strikes against a set screw 31 which is mounted upon the frame 11 of the machine and which acts as a stop to hold the roller 27 against movement While the trunnions 24 and 26 continue their movement toward the right a short distance. This results in straightening the toggle and forcing the free end of the platen 21 outwardly a distance indicated at a in Fig. 3. The

stops

28 and 31 are so adjusted that this straightening movement of the toggle is caused to progress far enough to bring the center lines of the toggle links a that the axis of roller 27 assumes the position indicated at d in Fig. 3. Hence pressure exerted inwardly upon the trunnion 24 does not tend to again break the toggle, but on the contrary serves effectively to hold it in its substantially straightened position.

Power for the operation of the press may be supplied from yany suitable source, as from an electric motor, not shown, working through suitable reduction gearing, also not shown, to rotate a shaft 32 at moderate speed. The shaft 32 is shorter than the distance between the sides 11 of the frame, and is mounted in bearings carried by a standard or housing 9 located midway between the sides of the frame and supported upon the base 10 of the machine. This shaft 32 at its ends carries two cranks 33 having crank pins 34 upon which are pivotally mounted connecting rods 35, the opposite ends of which are mounted upon projecting pins 36 carried by the table legs 17. The drive, it will be observed, is so arranged that theA movement or oscillation of the arcuate table occupies substantially theA same amount of time in each direction, and the lowest rate of movement is substantially at the ends of the stroke. This is of advantagein that it gives time for the operation of the toggles and also in that the feed of stock into the machine takes place at the time of one of these slow rates of movement. It is also of advantage, of course, in reducing vibration.

In the forward end of the arcuate table I mount near eachV side of the table a plunger 37 which carries a projection 38 against which bears one end of a coil spring 39, the opposite end of which bears against the base of a socket formed in the table, whereby the plunger is urged downwardly into contact with an arcuate guide bar 40 pivotally mounted upon a bracket 41 carried by the base of the machine, the plunger having a roller 42l at its lower end for engagement with the bar. yEach of these plungers carries a paper stop 43 and a paper gripper 44.

Each of the bars 40 near its upper end carries a roller follower 45 which runs upon a cam 46. These two Vcams are secured to the outer ends of a shaft 47 that is journaled in brackets 48 forming part of a standard 49 mounted upon the base 10 midwaylbetween the side walls 11 of the frame. The shaft 47 lis driven by means of chains 50 running over sprocket wheels 51 on the shaft 47 and 52 on the shaft 32, these sprocket wheels being of the same size so that shaft 47 is given one revolution for each revolution of shaft Each of the guide bars 40 has a straight portion 62 at its upper extremity along which the trifle beyond dead center, sol

roller 42 rides as the table nears the end of its movement towards the right. By this means the plungers 37 are raised, sufficiently to project the stops 43 above the surface of the table, in order that they may act to receive the sheet and bring it into accurate alignment. At about the time the arcuate table reaches the limit of its movementA toward the right the cams 46 lift the followers 45 and thereby swing the bars 4() upward, which results in raising the plungers 37 further, or until the grippers 44 engage the undersurface of the sheet and press it firmly against the head. On the movement of the table toward the lleft the stops 43 and grippers 44 remain in their fully extended positions until the rollers 42 travel cif of the straight portions 62 of the guide bars, when the grippers are withdrawn by the springs 3 By that time however the sheet is firmly heid by the die. The stops 43 remain extended beyond the surface of the table somewhat however until the high spots of the cams 46 move out from under the rollers 45, when the bars 4Q are lowered suiciently to permit the springs 39 towithdraw the stops 43 bclow the surface of the table, so that they are no longer in position to interfere with the action of gravity in the delivery or sheets from the table.

The work may be fed to the machine by hand over a feed board 53, or some suitable mechanical feeder may be employed if desired. It will be apparent that the delivery of the sheets takes` place in a natural manner by gravity. When so delivered they may be collected by hand, although preferably they are fed onto a conveyor or stacker of any suitable form and construction. y

In other respects, it is believed, the operation of the machine will be entirely obvious from the foregoing description of its construction. I have necessarily gone somewhat into detail in order to explain fully the particular embodiments of the invention herein illustrated, but I desire it to be understood that such detail disclosures are not to be construed as amounting to limitations except as they may be included in the appended claims.

Having thus described my invention, I claim:

1. In a cutting and creasing machine, two movable elements comprising a sliding head and an arcuate table cscillatable about an axis l0- cated in a plane parallel with the plane of the head, means for moving one Vof said elements back and forth, interconnecting operating means between said elements, an arcuate platen movable inwardly and outwardly on said table and adapted to cooperate with said head for pressing sheet material against said'head, and means operative during each reciprocation of the head for maintaining the platen tangent to the head on the working stroke and withdrawing it from tangent relationship on the return stroke.

2. In a cutting and creasing machine, a sliding head, atable oscillatable upon an axis locatedv in aY plane parallel to the plane of said head, said table having an arcuate platen tangent to said head when in working position and movable inwardly and outwardly on the table, said table and head being operatively interconnected for movement back and forth simultaneously and in corresponding degree, and means for advancing the platen outwardly to exert pressure upon the head during the working stroke and for retracting the platen inwardly to relieve the pressure on the return stroke.

3. In a cutting and creasing machine, a sliding head, a pivoted table operatively interconnected with said head for oscillating movement simultaneously with the reciprocation of the head, said table comprising an arcuate platen hinged at one end upon the table adapted to cooperate with'said headfor pressing sheet material against said head, an abutment on the table for the opposite end of said platen, and means for advancing and retracting said abutment during eachvreciprocation of the head, whereby lthe pressure exerted by the platen against the head may be relieved'on the nonworking stroke. y

4. In a cutting and creasing machine, a sliding head, a table oscillatabley upon 'an axis located in a plane parallel to the plane of said head, said table having an arcuate platen tangent to said head when in working position, said table and head being operatively interconnected for movement back and forth simultaneously and in corresponding degree, and means for advancing the platen to exert pressure upon the head during the working stroke and for retracting the platen to relieve the pressure on the return stroke, said means comprising a toggle joint connection between the platen and the table together with means for breaking the toggle at the end of the working stroke and for straightening the toggle at the end of the return stroke.

5. In a cutting and creasing machine, a sliding head, a table oscillatable upon an axis located in a plane parallel to the plane of said head, said table having an arcuate platen tangent to said head when in working position, said table and head being operatively interconnected for movement back and forth simultaneously and in corresponding degree, and means for advancing the platen to exert pressure upon the head during the working stroke and for retracting the platen to relieve the pressure on the return stroke, said means comprising a toggle joint connection between the platen and the table and a pair of fixed stops adapted to engage the center pin of the toggle on opposite sides thereof at the respective ends of the machine strokes, whereby the toggle is broken at the end of the working stroke and straightened at the end of the return stroke.

6. In a cutting and creasing machine, a frame, a sliding head, a pivoted table operatively interconnected with said head for oscillating movement simultaneously with the reciprocation of the head and in corresponding degree, said table comprising an arcuate platen hinged at one end to the table and adapted to cooperate with said head for pressing sheet material thereagainst, a toggle joint connecting the opposite end of the platen with the table, a stop on the frame adapted to engage one side of the toggle at the end of the working stroke for breaking the toggle and thereby swinging the platen out of operative position, and a stop on the frame adapted to engage the other side of the toggle at the end of the return stroke for straightening the toggle and thereby swinging the platen into operative position.

7. In a cutting and creasing machine, a frame, a sliding head, a pivoted table operatively interconnected with said head for oscillating movement simultaneously with the reciprocation of the head and in corresponding degree, said table comprising an arcuate platen hinged at one end to the table and adapted to cooperate with said head for pressing Ysheet; material thereagainst, a toggle joint connecting the opposite end of the platen with the table, a stop on the frame adapted to engage one side of the toggle at the end of the working stroke for breaking the toggle and thereby swinging the platen out of operative position, and a stop on the frame adapted 'to engage the other side of the toggle at the end of the return stroke for straightening the toggle and thereby swinging the platen into operative position, and' means carried by the table for limiting the movements of said toggle.

8. In a cutting and creasing machine, a frame, a sliding head, a pivoted ltable operatively interconnected with said head for oscillating movement simultaneously with the reciprocation of the head and in corresponding degree, said table comprising an arcuate platen hinged at one end to the table and adapted to cooperate with said head for pressing sheet material thereagainst, a toggle joint connecting the opposite end of the platen with the table, a stop on the frame` adapted to engage one side of the toggle at the end of the working stroke for breaking the toggle and thereby swinging the platen out of operative position, and a stop on the frame adapted to engage the other side of the toggle at the end of the return stroke for straightening the toggle and thereby swinging the platen into operative position, and means carried by the table for limiting the movements of said toggle, said last named means being adapted to permit the straightening movement of the toggle to extend slightly beyond dead center.

9. In a cutting and creasing machine, a head, a table oscillatable about an axis mounted in a plane parallel with the plane of the head, means for relatively reciprocating said head and axis in a direction at right angles to the latter, interconnecting operating means between said table and head for oscillating the table during such relative reciprocation, said table at the end of the working stroke being beyond the vertical plane through its axis, a paper stop at the forward end of the table, and means for retracting said stop before the table reaches the end of its working stroke and returning the stop to operative position beforethe table reaches the end of its return stroke.

10. In a cutting and creasing machine, a head, a table oscillatable about an axis mounted in a plane parallel with the plane of the head, means for relatively reciprocating said head and axis in a direction at right angles to the latter, interconnecting operating means between said table and head for oscillating the table during such relative reciprocation, said table at the end` of the working stroke being beyond the vertical plane through its axis, a plunger at the forward end of the table, a paper stop and a paper gripper on said plunger, and means for raising the plunger sufliciently to expose said paper stop shortly before the end of the return stroke of the table and for raising the plunger still further thereafter for bringing the paper gripper into operative position.

11. In a cutting and creasing machine, a sliding head member adapted to receive a die on its lower surface, inclined ways for said head, a table member oscillatable upon an axis located below said ways, said table member having an arcuate platen adapted to cooperate with said head for pressing material against said die in advancing line contact, means for moving one of said members backward and forward, operative connections with said last named member for producing corresponding movements in the other member, and means for maintaining the platen and head tangent to each other on the down stroke and out of tangential relationship on the up stroke.

12. In a cutting and creasing machine, a sliding head adapted to receive a die on its lower surface, an oscillatable table arranged beneath the path of said head, a transverse pivot for said table arranged parallel to the plane of the head, said table having an arcuate platen tangent to said head in working position, gearing connections between the table and head assuring oscillation of the table and reciprocation of the head in like degree and direction, whereby aline contact is maintained between the head' and the platen through the intermediacy of the work during the operating stroke, the center of gravity of the table standing substantially in the vertical plane through said pivot at the beginning of the operating stroke and to one side of said plane at the end of the operating stroke.

13. In a cutting and creasing machine, two movable elements comprising a sliding head and an arcuate table oscillatable about an axis located in a plane parallel with the plane of the head, means for moving one of said elements back and forth, interconnecting operating means between said elements, anarcuate platen hinged upon said table and adapted to cooperate with saidhead for pressing sheet material against said head in a line contact, and means operative during each reciprocation of the head for holding the free end of the platen outward to maintain the platen tangent to the head on the working stroke, and for moving the free end of the platen inwardly to withdraw the platen from tangent relationship on the return stroke.

FREDERICK W. SEYBOLD.