US1938724A - Cutting and creasing press - Google Patents

Description

Dec. 12, 1933. F. w. SEYBOLD 1,933,724

CUTTING AND CREASING PRESS .Filed July 27, 1932 2 Sheets-Sheet l @MM M Arman/5m Dec. 12, 1933. F. w. SEYBOLD 1,938,724

CUTTING AND CREASING PRESS Filed July 27, 1932 2 Sheets-Sheet 2 Arroeuars Patented Dec. 12, 1933 UNITED STATES CUTTING AND CREASING PRESS Frederick W. Se'ybold, Dayton, Ohio, assignor to Harris, Seybold, Potter Company, Cleveland,

Ohio, a corporation of, Delaware Application July 27, 1932.

Serial No. 624,969

Claims. (01. 93-58) This invention relates to improvements in cutting and creasing machines, that is to say, machines adapted either to cut or crease sheet material, or to perform both cutting and creas- 5 ing operations where called for. Machines of this general nature are commonly used for making box blanks of pasteboard or corrugated board and for cutting out gaskets, mats and other articles of paper, fabric, sheet rubber and 0 similar materials.

Gne form of machine now employed for this purpose consists of a fiat bed press where the die is made up on a reciprocating table with which a rotating cylinder cooperates, the sheet 5 material being fed to gripping fingers on the cylinder and thus drawn through the press. Another style of machine resembles the common platen form of hand printing press. There is a further form in which the die is carried by 0 one of two parallel surfaces which move toward and away from each other at right angles to the surfaces. In the two styles of machines last mentioned, the cutting takes place all at one time, necessitating heavy power application. In

5 the cylinder type the contact between the die and cylinder is a line contact which advances across the face of the die as the cut or impression is made. The latter type of machine is somewhat objectionable for use upon materials that are not easily flexed, because the sheet, in passing through the machine, must be curved around the periphery of the cylinder.

One of the objects of the present invention is the provision of a machine which shall preserve the advantages of the various types of machines now on the market, while overcoming the dilficulties inherent therein.

Another object of the invention is the provision of a machine of this character that is adapted to cut or crease sheets without bending them materially, while at the same time conserving power by exerting pressure along an advancing line contact.

Another object is the provision of a machine which shall be safe to operate.

Still another object is the provision of a machine having a compact driving mechanism adapted to provide oscillation or reciprocation with approximately simple harmonic motion.

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 an end view ofv my improved machine;

Fig. 2 is a vertical longitudinal. section taken: substantially on line 22 of Fig. 1, but showing the driving mechanism in a somewhat dif- 6 ferent positionv for convenience of illustration;

Figs. 3 and 4 are detail vertical sectional views taken substantially on lines 3-3 and 44, respectively, of Fig. 1, with the driving mechanism in the position of Fig. 2.

Essentially, my improved machine comprises a reciprocating head 10, in the lower face of which the die is mounted, and a cooperating arcuate table 11, forming in effect a segment of a cylinder of large radius. The sheet material to be acted upon is fed into the machine over a feed board 12, gripped between the table 11 and the head 10, or die carried thereby, and subjected to a line pressure which advances as the rolling contact of the head and table progrosses. Some suitable interconnection for insuring corresponding movement of the head and table is provided, and reciprocating or oscillating motion is imparted to one of these two members, preferably the table. The radius. of the arcuate table is so great that the angle of contact between the table and head is very small, resulting in much less tendency to strain the die than occurs in a cylinder machine, particularly as to those portions of a die which lie lengthwise of the cylindrical surface. Furthermore, the material is put through the machine flat, passing in at one end and out at the other.

Referringnow to the drawings more partio-' ularly, the base of the machine is shown at 13. Side walls 14 are bolted or otherwise secured to the base'13, and may be joined above the base by tie rods 15 and 16 in order to insure rigidity. Guide grooves 17 are formed in the side walls 14 within which run anti-frictionrollers 18 that are mounted upon the sliding head 10.. This head, at each of its outer ends, carries a depending gear rack 19, the teeth of which mesh with the teeth on each of two gear sectors 20 that are attached to the table 11. Any suitable means may be provided for effecting a limited adjustment of the head 10 upon its rollers 18, in order that the head may be maintained always tangent to the arc of the table 11, and in order that the clearance between the head and table may be varied slightly when necessary.

The table 11 is provided with downwardly extending sides 21 which may be substantially triangular in shape, and which are journaled at their lower ends upon aligned stub shafts 22 mounted in the side walls 14 of the machine frame. The axis of aligned shafts 22 is at the center of the cylinder of which the surface of table 11 is a segment. The radius of this cylinder is preferably quite long, as of the order of six feet for example.

In each side wall 21 of the table I form a slot 23 which receives a block 24 on the outer end of a crank 25, these two cranks being secured upon'the outer ends of a shaft 26, which is journaled in bearings 27 and 28 carried by standards 29 and 30, respectively, that are bolted to the base 13 of the machine. The rotation of the crank shaft 26, of course, causes the cranks 25 to revolve and to impart oscillating motion to the table 11, causing it to.

swing back and forth and to move head 10 correspondingly through the intermediacy of the intermeshing teeth on the racks and sectors 19 and 20.

If the rotation of shaft 26 were regular, that is at constant angular velocity, the movement of the table in, one direction would be more rapid than in the other, owing to the'angularity of the crank when in its two positions at right angles to the slot 23, and, as the moving parts are quite heavy, this would produce vibration and consequent wear, and would require a greater expenditure of power than would a regular motion wherein the maximum velocity of the moving parts would be the same on the working and return strokes. I have accordingly devised means for so varying the velocity of crank shaft 26 as to compensate for this difference in angular velocity, the net result being oscillation of the table 11 with equal maximum angular velocity for both the forward and return strokes. This driving mechanism will now be described.

In Fig. 2 I have shown a source of power, as an electric motor 31. -A' belt 32, driven by the pulley of the motor, runs over a pulley 33 which is secured to one side of a fly wheel 34 that is loosely mounted upon a shaft 35 journaled in standard 29 and in a bracket 36 formed integral ith standard 30. The central plate 37 of a clutch is attached at spaced points along its periphery to fly wheel 34, and is adapted to be engaged by a pair of outer plates mounted upon a hub 38 which is keyed to shaft 35. Suitable means for engaging and disengaging the clutch surfaces may be provided.

The shaft 35 carries a small gear 39 which meshes with a large gear 40 that is mounted upon another shaft 41 which has bearings at its ends in the standards 29 and 30 and an intermediate bearing in the bracket 36. On the shaft 41 there is also mounted a small gear 42 which meshes with a second large gear 43. The reduction in speed through the chain of gears just described is obviously quite considerable. The speed of the machine illustrated is necessarily rather low, because it is designed to be fed by hand.

Gear 43 is provided with a large central opening surrounded by a hub 44, see Fig. 3, which is rotatably mounted upon a ring 45 having a peripheral flange 46 that is bolted to the standard 30. The arrangement is such that the center of gear 43 is considerably offset from the center of shaft 26, which extends through the block being pivotally connected with the outer end of a crank 49 that is fixed to shaft 26. It will be apparent that as the gear 43 rotates, the crank 49 will be revolved, but, owing to the eccentricity of the shaft 26 with respect to the center of gear 43, the angular velocity imparted to shaft 26 will vary throughout each revolution. The parts are so designed and proportioned, however, that the variable motion thus imparted to shaft 26 will compensate for the variable drive which would be otherwise imparted to the oscillating table by the cranks 25. The resulting motion departs slightly from simple harmonic motion, for while the maximum rate of travel occurs at mid stroke and is the same in each direction, the points of greatest acceleration are not at the ends of the stroke as in simple harmonic motion. The approximation to simple harmonic motion is, however, so close, that I shall refer to the motion hereinafter, for want of a better term, as compound harmonic motion. By the means described, therefore, I oscillate the table 11 with compound harmonic motion, while utilizing a compact driving mechanism positioned entirely within the frame of the machine.

At the forward end of the arcuate table 11 I mount suitable stop fingers, indicated at 50 in Fig. 2. The sheet material to be treated is fed by the operator over feed board 12 up against these stops. Then a series of gripping fingers 51, slidably mounted in the table 11, are caused to rise and engage the sheet material just behind the stops 50, clamping it against the undersurface of head 10. These fingers 51 are secured to a cross rod 52, which is provided at its ends with rollers that are adapted to run upon cam arms 53 hinged to the frame of the machine at 54. These arms at their opposite ends carry rollers 55 which run upon earns 56 that are keyed to a shaft 5'7 mounted in bearings at the tops of standards 29 and 36 and driven from shaft 26 by sprockets 58 and 59 and chains 60. The cams 56 are so designed and positioned upon shaft 57 that at the proper time, that is after the operator has fed a sheet into position against stops 50, the high spots of the cams will suddenly raise rollers 55, swinging cam arms 53 upon their pivots 54, and thereby raising fingers 51 to grip the sheet. This condition is shown in Fig. 2. As the head and table travel toward the left in that figure, the rollers on rod 52 run upon the cam surfaces of the arms 53 and hold the gripping fingers in operative position. When the rollers on rod 52 reach the descent points 61 in the cam arms, the gripping fingers drop away from the sheet, which by that time is firmly held between the die and the arcuate table. On the return stroke the rollers 55 ride upon the low part of cams 56, so that the gripping iingers are not raised into position where they would interfere withfeeding the next sheet into position against the stops 50, and they remain so withdrawn until the cam arms 53 are again raised by the high part of cams 56.

The operation of the machine, it is believed, will be quite apparent from the foregoing description of its parts. The sheets to be acted upon are fed into the machine at one end, that is over the feed board 12, and are delivered, still in substantially flat form, at the other end of the machine. There is relatively little danger to the operator, because the moving parts of the machine travel away from the feed board where he has his hands. The pressure, of course, is

exerted along a line'extending transversely of the machine and lengthwise of the'cylinder of which the table is a segment, and this line advances as the movement ofthe head and table progresses on the working stroke. The power required for forcing the die into the sheet is, therefore, applied gradually through an appreciable length of time. When the head and table have moved sufliciently toward the left in Fig. 2, the work is stripped from the die by the resilient means commonly used in the art, and it drops onto a suitable chute or other work collecting means.

In the foregoing description I have necessarily gone somewhat into detail in order to explain fullythe 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, a sliding head adapted to receive a die on its lower surface, and an arcuate table arranged beneath the path of said head to cooperate with said head for pressing sheet material against said die in advancing line contact.

2. In a cutting and creasing machine, a sliding head adapted to receive a die on its lower surface, and an arcuate table arranged beneath the path of said head to cooperate with said head for pressing sheet material against said die in advancing line contact, said head and table being operatively interconnected for movement simultaneously and in corresponding degree.

3. In a cutting and creasing machine, a sliding head member adapted to receive a die on its lower surface, an arcuate table member arranged beneath the path of said head member to cooperate with said head member for pressing sheet material against said die in advancing line contact, means for moving one of said members backward and forward, and operative connections with said last named member for producing corresponding movement in the other member. 7

4. In a cutting and creasing machine, a sliding head member adapted to receive a die on its lower surface, an arcuate table member arranged beneath the path of said head member to cooperate with said head member for pressing sheet material against said die in advancing line contact, means for moving one of said members backward and forward, a rack on said head member, and an intermeshing gear sector on said table member, whereby said members move together in either direction.

5. In a cutting and creasing machine, a head adapted to receive a die on its lower surface, means for mounting said head for reciprocating movement in a given straight path, an arcuate table oscillatably mounted about an axis at the center of the table are below the path of movement of said head, said axis being spaced from said head a distance substantially equal to the radius of said arc, means for oscillating said table, and interconnecting operating means between said table and head for moving the latter proportionately to the movement of the table.

6. In a cutting and creasing machine, a sliding head adapted to receive a die on its lower surface, an arcuate table arranged to cooperate with said head for pressing sheet material against said die in advancing line contact, and a feed board extending into the angle between the head and table to one side of their line of contact.

7. In a cutting and creasing machine, a sliding head member adapted to receive a die on its lower surface, an arcuate table member arranged to cooperate with said head member for pressing sheet 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 movement in the other member, and means acting to grip the forward ends of the sheets-to said head member.

8. In a cutting and creasing machine, a sliding head member adapted to receive a die, an arcuate table member arranged to cooperate with said head member for pressing sheet 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 movement in the other member,- and means on one of said members automatically actuated to grip a sheet, said means being automatically released after the engagement of the sheet by the die has begun.

9. In a cutting and creasing machine, a sliding head member adapted to receive a die, an arcuate table member arrangedto cooperate with said head member for pressing sheet 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 movement in the other member, and means on said table for gripping sheets against said head member during the working stroke of the press, said means being disabled during the return stroke.

10. In a cutting and creasing machine, a sliding head member adapted to receive a die, an arcuate table member arranged to cooperate with said head member for pressing sheet material against said die in advancing line contact, means for moving one of said members back and forth, comprising a crank shaft, a crank drive from said shaft to said last named member, means for imparting rotation to said crank shaft at variable angular velocity to compensate for the eccentricity of said crank drive, whereby compound harmonic motion is imparted to said last named member, and operative connections with said last named member for producing corresponding movement in the other member.

11. In a cutting and creasing machine, a sliding head adapted to receive a die, an arcuate table arranged to cooperate with said head for pressing sheet material against said die in advancing line contact, means for reciprocating said table, comprising a crank shaft, a crank drive from said shaft to said table, and means for imparting rotation to said crank shaft at variable angular velocity to compensate for the eccentricity of said crank drive, whereby compound harmonic motion is imparted to said table.

12. In a cutting and creasing machine, a sliding head adapted to receive a die, an arcuate table mounted to oscillate about an axis at the center of the table arc, said table and die having rolling contact through the intermediacy of a sheet being treated, a rotary element driven at constant angular velocity, means for converting the rotary motion of said element into compound harmonic oscillation of said table, and means for returning said sliding headto inoperative position after each working stroke.

13. In a cutting and creasing machine, a head member adapted to receive a die on its lower surface, means for mounting said head member for reciprocation in a given straight path, an arcuate table member mounted to oscillate about an axis below said head member at the center of the table arc, means for moving said members simultaneously in one direction from the initial position for pressing sheet material against said die in advancing line contact, and for returning said members to their initial positions after the working stroke is completed.

14. In a cutting and creasing machine, a head adapted to receive a die on its under side, means.

for mounting said head for reciprocation in a given straight path, a longitudinally arcuate table of a width substantially the same as the width of said head positioned beneath said head, said table comprising sides osoillatably mounted upon a common axis located at the center of the table are, means for operatively interconnecting said head and table to move together in opposite directions, and driving mechanism located in the space between the sides of said table and arranged to oscillate the table upon its said axis.

15. In a cutting and creasing machine, a head adapted to receive a die on its under side, means for mounting said head for reciprocation in a given straight path, a longitudinally arcuate table of a width substantially the same as the width of said head positioned beneath said head, said table comprising sides oscillatably mounted upon a common axis located at the center of the table are, means for cperatively interconnecting said head and table to move together in opposite directions, and driving mechanism located in the space between the sides of said table and operatively connected to each of the sides thereof for oscillating the table upon its said axis.

16. In a cutting and creasing machine, a head adapted to carry a die on its lower surface, an arcuate table oscillatably mounted about an axis at the center of the table arc, said axis being positioned below said head and spaced therefrom a distance substantially equal to the radius of said means for relatively reciprocating said head and axis in a direction at right angles to the axis, and interconnecting operating means between said table and head for oscillating the table during such relative reciprocation.

17. In a cutting and creasing machine, a head arranged in an inclined plane, an arcuate table oscillatably mounted on an axis positioned be low the head parallel to the plane of the head and spaced therefrom a distance substantially equal to the radius of the table are, means for relatively reciprocating said head and axis in a direction at right angles to the axis, interconnecting operating means between said table and head for oscillating the table during such relative reciprocation, and a feeding means arranged beneath the plane of the head at the upper end thereof, whereby the arcuate table at the completion of a working stroke will be inclined downwardly in a position to discharge sheets by gravity.

18. In a cutting and creasing'machine, a reciprocable head adapted to carry a die on its lower surface, guides for said head arranged in an inclined position, an arcuate table oscillatably mounted about an axis positioned below said guides in a plane perpendicular to the guides intersecting the guides substantially at the middle thereof, said table and head having rolling contact through the intermediacy of dies and stock, and being intergeared for simultaneous movement, and feeding means adapted to deliver stock into the space between the head and table when the latter are at the upper limits of their movement.

19. In a machine of the class described, a flat die, a reciprocable'carrier therefor, an arcuate table element having rolling contact with said die through the intermediacy of the work, whereby the work may be pressed against the die along an advancing line contact, and means mounted upon the forward end of the arcuate table element for gripping the work to the forward end of the die carrier, said gripping means moving away from the die carrier after the die has begun to engage the work.

20. In a cutting and creasing machine, a sliding head member adapted to receive a die on its lower surface, an arcuate table member arranged to cooperate with said head member for pressing sheet 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 movement in the other member, means carried by one of said members for gripping the sheets to said head member, a track adapted to hold said gripping means in operative position during the first part of the working stroke, and means'ior lowering said track duringthe major part of the return stroke.

FREDERICK W. SEYB'OLD.

Images