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Blank punching method and apparatus

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US3800641A
US3800641A US17152071A US3800641A US 3800641 A US3800641 A US 3800641A US 17152071 A US17152071 A US 17152071A US 3800641 A US3800641 A US 3800641A
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pressure
plate
punching
means
knives
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E Spengler
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E Spengler
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38Cutting-out; Stamping-out
    • B26F1/40Cutting-out; Stamping-out using a press, e.g. of the ram type
    • B26F1/42Cutting-out; Stamping-out using a press, e.g. of the ram type having a pressure roller
    • AHUMAN NECESSITIES
    • A43FOOTWEAR
    • A43DMACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D8/00Machines for cutting, ornamenting, marking or otherwise working up shoe part blanks
    • A43D8/02Cutting-out
    • A43D8/04Stamping-out
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/02Perforating by punching, e.g. with relatively-reciprocating punch and bed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38Cutting-out; Stamping-out
    • B26F1/40Cutting-out; Stamping-out using a press, e.g. of the ram type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F2210/00Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products
    • B26F2210/12Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products of fabrics
    • B26F2210/16Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products of fabrics the cutting machine comprising a cutting die
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00Cutting
    • Y10S83/929Particular nature of work or product
    • Y10S83/936Cloth or leather
    • Y10S83/939Cloth or leather with work support
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/04Processes
    • Y10T83/0524Plural cutting steps
    • Y10T83/0577Repetitive blanking
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/465Cutting motion of tool has component in direction of moving work
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8702Clicker die press
    • Y10T83/8703With die handling attachment

Abstract

This disclosure relates to a method and apparatus for punching out blanks from sheet materials. The material is laid on a base plate and punch knives are arranged in a pattern upon the material and covered by a pressure plate to form a sandwich assembly which is conveyed through a roller punching machine to force the knives through the material. When the sandwich has passed between two pressure rollers, the pressure plate is returned to its starting position with the aid of one of the rollers which rotate continuously in the same direction. A new sandwich may then be passed between the rollers. In a modification an electromagnetic lifting device is provided comprising a frame on which bar magnets are adjustably mounted so that the punch knives can be removed and replaced without disturbing their original pattern of distribution.

Description

United States Patent 1191 Spengler Apr. 2, 1,974

[54]- BLANK PUNCI-[ING METHOD AND 835,522 11/1906 Higgins 83/284 X APPARATUS 3,570,340 3/1971 Rohdin 3,301,] 10 l/l967 Stcgncr 83/284 X Inventor: Ernst M- p g Lerehenstrasse 2,788,069 4/1957 Noojin, Jr. et al 83/50 x 47, D-6056 Hcusenstamm, Germany Primary ExaminerRoy Lake 2 Fflcdz g 3 1971 Assistant Examiner-James F. C0811 Attorney, Agent, or FirmW. G. Fassc [21] Appl. No.: 171,520

Related US. Application Data ABSTRACT [63] Continuation-impart of Scr. No. 883,856, Dec. 10, This disclosum relates) a method and apparatus for 1969, abandoned. punching out blanks from sheet materials. The matcrial is laid on a base plate and punch knives are ar- [30] Foreign Application Priority Data ranged in a pattern upon the material and covered by Dec. 17, 1968 Germany 1815115 a Pressure plate to form a Sandwich assembly which is conveyed through a roller punching machine to force 52 us. c1 83/50, 83/284, 83/532, the knives through the materiet When the Sendwieh 83/925 CC has passed between two pressure rollers, the pressure 51 Int. Cl 826d 7/06, B26f 1/42 Plate is returned e its Starting Position w the aid of [58] Field of Search....i 83/29, 39, 50, 55, 284, one of the rollers whieh rotate eentihueusly in the 83/531, 532 563, 925 CC, 745 same direction. A new sandwich may then be passed 1 between the rollers. In a modification an electromag- [56] References Cited netic lifting device is provided comprising a frame on UNITED STATES PATENTS, which bar magnets are adjustably mounted so that the I punch knives can be removed and replaced without i disturbing their original pattern of distribution. 3,077,807 2/1963 Wright... 83/532 13 Claims, 16 Drawing Figures PAIENIEBAPR 21914 3.800.641

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ERNST SPENGLER HTTOFLNEIS PAIENIEM 3,800,641

sum 1our11 PATENTEUAPB 2 am SNEEI '11 0F 11 I O Xmw M hw BLANK PUNCHING METHOD AND APPARATUS This is a continuation-in-part application of my copending application, Ser. No. 883,856, filed Dec. 10, 1969 and now abandoned. I

BACKGROUND OF THE INVENTION The invention relates to a method and apparatus for punching out blanks or work pieces from sheet or foillike materials, for example textile fabrics, leather, cardboard, rubber or the like.

It is known to use punching devices for punching out blanks whereby so called strip steel knives are used, the knife-edges of which are shaped to match the outline of the work pieces to be punched out. For this purpose a pressure plate is laid on the punching knives or on the sheet material depending on the arrangement of the knives.

US. Pat. No. 2,168,400 granted to A.J. Evers on Aug. 8, 1939 describes a method for separating blanks from sheet material by means of cooperating pressure rollers, as well as upper and lower pressure plates and shaped wires effecting a pressure separation rather than a cutting operation. This known apparatus further requires a reciprocating bed for the lower pressure plate which may be an integral part of such reciprocating bed. Further a return carriage for the upper pressure plate is required. The use of a reciprocating bed requires a reversing motor'which also reverses the direction of rotation of the pressure rollers. This is not efficient due to the substantial masses which must be accelerated and decelerated during each working cycle. US. Pat. No. 3,301,110 granted to H.L. Stegner on Jan. 31,1967 discloses a roller operated punching apparatus in which a plurality of rollers cooperate to effectuate a progressive rather than a single impact as in vertical stamping presses.

OBJECTS OF THE INVENTION It is the object of the invention to provide a method and apparatus suitable for die stamping by means of rollers rotating continuously in the same direction to operate more efficiently than hitherto.

Another object of the invention is to provide. a die I SUMMARY oF THE INVENTION In a method in accordance with the invention for punching out blanks by means of strip steel knives and a pressure plate, the punch knives are laid on the material and covered by the pressure plate, the pressure plate is returned automatically by the rotation of the punch rollers after the punching and restored to the initial position for cooperation with the next set or stack to be punched.

According to a further feature of the invention, the method may be carried out in such a manner that after the pressure plate has been removed after the punching out, the punch knives are located electromagnetically and removed automatically from the material in the form of a positional pattern which is restored to its initial position and deposited on the material for the next operation, aligned, if necessary after being laid down and covered by the pressure plate for the next punching operation.

According to the invention there is further provided a punching apparatus wherein a stationary table with conveyor rollers fora punch set or stack is disposed upstream of a roller punching device as viewed in the direction of work flow. A further stationary table is arranged downstream of said roller punching device. Supporting rollers for raising and lowering a pressure plate are provided above said stationary tables whereby the pressure-plate can be returned to its starting position by the rotation of the upper pressure roller.

Furthermore, according to the invention electromagnetic rods may be movably mounted in a separate, movable frame so that it can be pushed on to the supporting rollers which can be raised and lowered for the pressure plate, instead of the pressure' plate. The punching knives may be equipped with iron cores, preferably constructed in the form of ejectors for cooperation with the electromagnets.-

BRIEF DESCRIPTION OF THE DRAWINGS In order that the invention may be clearly understood it will now be described by way of example, with reference to the accompanying drawings, wherein:

FIG. 1 shows in section a view of a set or stack complan view of a modified form of construction of the apparatus according to the invention;

FIG. 12 shows an end view in the direction of the arrow XII in FIG. 11;

FIG. 13 shows in section a detail on a larger scale;

FIG. 14 illustrates diagrammatically a manner of feeding the set or stack through a gap between two pressure rollers during a punching operation;

FIG. 15 illustrates a view similar to FIG. 14 but showing an improved manner and device for feeding the set or stack through said gap between the pressure rollers during a punching operation; and

FIG. 16 illustrates a modification of a device according to the invention employing plan-parallel guide means for supporting the guide rails or rollers.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS strip steel punch knives 2 placed on one or more layersof sheet or web material 1 to be cut. The knives are covered by a pressure plate 4. The material 1 rests on a base plate 3. These fourparts together form said punch stack P quite similar to a sandwich to which pressure is applied as indicated at 6.

The stack P is assembled on a first stationary table 10 (see FIGS. 2 and 3), and passed through a punching device to a second stationary table 11. After the punching-out in the punching device 5 the rollers of which rotate continuously in the same direction, the pressure plate 4 is automatically lifted from the punch knives 2 and restored to an initial position on the punch knives for the next operation as will be described in more detail below. Since FIGS. 2 and 3 are top plan views, the punch knives are not visible.

The return of the pressure plate 4 may be effected as shown in FIG. 2 by passing it above the punching device 5 or as shown in FIG. 3 by passing it to the side of the punching device 5, as indicated by the dashed arrows.

According to FIGS. 4 to 7, a device suitable for carrying out the method according to the invention comprises a punching device 5 which is illustrated in FIG. 4 as a bridge punch and in FIG. 5 and 6 as a pressure roller punch.

The stationary tables 10 and 11 are provided with conveyor rollers 12 for supporting the punch stack P. As viewed in the direction of work advance the table 10 isarranged upstream and the table 11 is arranged downstream of the punching device 5. The tables l0, 11 may be constructed in any desired manner and may be mounted on suitable pedestals 13, 14, for example.

Each table 10 and 11 respectively is provided along its longitudinal sides with supporting rollers 15, which can be raised and lowered, for supporting the pressure plate 4. The supporting rollers 15 may be mounted in rails 16. The rails 16 with the supporting rollers 15 can be raised and lowered by means of bell-crank levers l7 and linkages 18. In other words, the rails 16 extending longitudinally adjacent each side of each of the tables 10 and 11 can be moved vertically up and down by the means 17, 18. Each rail is provided with rollers 15 for supporting only the edges of the pressure plate 4, so that the rollers 15 associated with table 11 can pick up the pressure plate 4 without interfering with the remainder of the stack P, and the rollers 15 associated with the table 10 can place the pressure plate 4 on a stack P on this table without disturbing the stack.

In the illustration shown in FIG. 4, the punch stack P is initially on the table 10 in front of the punching device 5. The punch stack P is then conveyed through the punching device 5 in the direction of work advance indicated by the arrow 19.

After the termination of the punching operation, the punch stack P is on the table 11. In this position, the pressure plate 4 is automatically lifted from the punch knives 2 by the rails 16 with rollers 15, and is then in the position shown in FIG. 5. The means for the automatic lifting will be described with reference to FIG. 16.

In the position seen in FIG 5, the pressure plate 4 has been raised to the top of the upper pressure roller in the punching device 5. At this time, the rails 16 associated with table 10 have also been raised so that, by initially urging the pressure plate 4 in the direction of the arrow, as will be described below, the top of the upper pressure roller will carry the pressure plate 4 back to the rollers 15 associated with the table 10, as seen in FIG. 6. The latter rollers may then be lowered on their respective rails to place the pressure plate on a new stack P, i.e., to the position illustrated in FIG. 4. This mode of operation corresponds to the illustration shown in FIG. 2.

Alternatively, as shown in FIG. 3, the pressure plate 4 may first be conveyed laterally out of the working direction by means of suitable mechanical devices not illustrated,- and brought around the punching device onto the table 10 in front of the punching device.

It is to be particularly noted that in each of these modes of operation, it is not necessary to provide reciprocation for the passing of materials through the punching device, since there is no reciprocating bed nor any reciprocating pressure plate carrier. Nevertheless the same pressure plate 4 may be employed in each punching operation, and the pressure rollers may be continuously rotating in the same direction. The first above described mode of operation is particularly advantageoussince the upper roller is employed to return the pressure plate 4 to its initial position without reversing the rotational direction of the upper pressure roller.

In the modes of operation described above the punching knives 2 may be placed individually on the material 1 on the table 10 or a plurality of punch knives 2 may be mounted with very slight spacings between the strip steel knives, on a common base plate (not shown) and laid on the material 1 in this form.

Alternatively, it is possible after lifting the pressure plate 4 following punching out as shown in FIG. 5, to locate the punch knives 2 electromagnetically and lifting them automatically from the material 1 in the form of a positional pattern, and restoring them to the initial position. The device serving this purpose is illustrated in FIGS. 7 to 13.

FIG. 7 illustrates the discharge end of the punching apparatus as shown in the right-hand portion of FIG. 5. In addition, a device M with a magnetic frame 35 is arranged for removing the positional pattern formed by the punching knives 2. The magnetic frame 35 is mounted at a suitable height on a stand 41. Following a punching operation, instead of being directly returned to the side upstream of the device 5, the pressure plate.4 is pushed onto the magnetic frame 35 by rollers 15. Then the magnetic frame 35, together with the'pressure plate 4 resting thereon, is moved from the device M onto the rollers 15 of the rails 16 as shown in FIG. 8 and lowered onto the punching knives 2.

As illustrated in FIGS. 7 to 13, the frame 35 includes a plurality of transversely extending electromagnets 32. The ends of the electromagnets 32 are provided with rollers 34 (see FIG. 13) which ride in the frame 35 to permit adjustment of the electromagnets. As illustrated in FIG. 11, the electromagnets are adapted to be connected to a suitable source of current to energize the magnets. As is also illustrated in FIG. 11, the punch knives 2 may be provided with iron cores 33, which cooperate with the electromagnets so that the knives are automatically attached to the electromagnets when the frame is positioned on top of the punching knives and the electromagnets 32 are energized.

After the assembly of the pressure plate 4 and frame 35 is lowered onto the punching knives 2 as shown in FIG. 8, the current of the source is turned on to energize the electromagnets, and thereby connect the punching knives to the frame 35.

1 The unit which is formed by this means comprises the punching knives 2 located in the form of a positional pattermthe magnetic frame 35 and the pressure plate 4. As in the preceding embodiment of FIG. 3, this unit is brought to a table at the side of the machine as shown in FIG. 9. For this purpose, a portable table as shown in FIG. may be employed. On the table the pressure plate is first removed from the upper side of the magnetic frame 35 which is then lowered onto an uncut stack of material before the next punching operation. The current is then switched off and the magnetic frame is raised from the punching knives, thereby leaving the punching knives on the material. Then the punching knives are aligned (e.g. manually) if necessary and thereafter, the pressure plate is lowered onto the punching knives by means of the devices described previously, whereupon the operation is repeated.

In order to locate and hold the electromagnets in place, hand levers 37, shown in FIGS. 10-13 may be pivotally mounted on frame 35, and biased by means of compression springs 36. A pressure shoe 38 extends along the length of the frame 35 on each side thereof, as shown in FIGS. 11 and 13, and the springs 36 urge the levers against the shoes 38 to hold the pressure plate4 against the top of the bar electromagnets. The shoes 38 may be manually released by means of levers 37.

The mode of operation with the frame 35 and its electromagnets 32 has the advantage of being rather simple since the punch knives may be laid out by hand before the first o'peration, whereupon the punching operation can be repeated as often as desired with the same arrangement of punching knives because the positional pattern is maintained and visible at any time in the open magnetic frame filled only by the electromagnets 32. Another advantage is the ease with which the pattern may be rearranged or adjusted, if required. Adjustment'is, for example, necessary where the pattern'of a textile material requires a very precise alignment 'of the punching knives depending on the course of the threads of the material. FIG. 14 illustrates on a relatively enlarged scale one arrangement that may be employed for feeding .the stack P through a punching device 5 comprising upper and lower pressure rollers and 51 respectively which, according to the invention are driven continuously in the same direction-In FIG. 14 the upper horizontal surface formed by the conveyor rollers 12 upstream and downstream of the punching device, is at the same level as the top of the bottom pressure roller 51, that is, the plane of the tops of the rollers 12 extends, tangentially to the top of the pressure roller 51 and perpendicularly to the plane through the axes of the two pressure rollers 50 and 51. The arangement of FIG. 14 has been found to be somewhat unsatisfactory in certain operations, especially where about 50 layers of fabric are to be cut in one passage through the punching device, since it introduces stresses W in the knives, and may produce travelling waves in the material being cut, much in the manner well observed in connection with rolling a sheet of dough with a rolling pin. Such waves are undesirable since they may cause a shift of the sheets or layers relative to each other.

It has been found, according to the invention that the above described problem may be overcome by employing the feeding arrangement according to FIG. 15. In this arrangement, the plane of the top surfaces of the rollers 12 is again normal to theplane through the axes of the pressure rollers 50,51 but it is now displaced downwardly toward the axis'of the lower roller 51. Thus, when the stack is first fed into the rollers, the leading edge 55 of the base plate 3 engages the lower roller so that the lower roller lifts the plate 3 from the rollers 12 closest to the punching device 5, as illustrated in FIG. 15. The figure illustrates the downward displacement A of the rollers 12, which has been found to prevent buckling of the knives 2 and also to prevent the formation of a travelling wave in the material, as

above described.

The length of the displacement A will be selected in accordance with the thickness of the stack P and the flexibility of the material to be cut as well as with regard to the width of the gap between the rollers 50 and 51 and the diameters of the rollers 50 and 51.

In operation of the arrangements of FIGS. 4 to 7, it has been found that certain difficulties arise as a result of the use of bell-crank levers l7 and linkages 18 for raising and lowering the rails 16. As can be seen in these figures, the guide rails 16 follow generally accurate paths, and it would be expected that the parallelogram coupling with the use of the levers 17 would ensure that the guide rails move in such amanner that the railslower the pressure plate 4 evenly or rather horizontally onto the stack P. In practice, however, it has been found that this manner of raising andlowering the guide rails does not in fact readily permit the lowering of the pressure plate 4 onto the stack with the desired parallel relationship between the pressure plate and the stack. I

In order to overcome this problem, as illustrated in FIG. 16, a pair of vertical guide posts is provided adjacent each guide rail 16, and guide bearings or sleeves 61 are affixed to guide the rails 16 for the vertical movement. The upper ends of the guide posts may be firmly held against movement, for example, by means of interconnecting structural frame members 62. The arrangement shown in FIG. 16 for guiding the rails 16 in their vertical movement is purely illustrative.

In order to raise and lower the guide rails 16, levers 65 may be provided. The lower ends of these levers are connected to rollers 66 which ride inthe slots 67 of horizontally slotted members68 affixed to the guide rails 16. The levers 65 at each side of the punching device are interconnected by a suitable pivoted coupling rod 69, and each lever and rod assembly is operatively' coupled, for example, by way of hydraulic control members 70, to a central operating control device 71 such as hydraulic drive means.

The vertical movement by the means disclosed, for example in FIG. 16 and the plane-parallel guiding assures proper level lowering of the guide rails. It is to be noted that in the arrangement'of FIG. 16 the guide rails are positioned in the same relationship as in the corresponding FIG. 6, and the guide rails 16 of FIG. 16 are controlled in the same manner as above described.

As noted above in one embodiment of the invention, the pressure plate 4 is returned after a punching operation by raising it and passing it over the upper pressure roller 50 whereby the horizontal return drive results from the contact between the upper ridge of the pressure roller 50 and the pressure plate 4 to effect the movement of the pressure plate. This return operation may be automatically effected. For example, as further illustrated in FIG. 16, a suitable sensor 75 may be employed to detect the presence of the pressure plate 4, or the rails 16, in such a position that the pressure plate is ready to be returned. The sensor 75 may be any suitable sensor, such as a pressure sensor or a contact switch. The sensor 75 is coupled to a device 76 suitably mounted to urge the pressure plate into contact with the top ridge of the upper roller 50, so that the roller 50 carries the pressure plate back across the top of the punching device and onto the roller associated with the table 10. For example, the device 76 may be a hydraulic cylinder, or an electric solenoid, operated in conventional fashion by the sensor 75. The sensor 75 and device 76 are mounted by any conventional means for the above purpose. I

The raising and lowering is also effected in response to sensing means, such as trip dogs (not shown) which sense the position of the stack.

Although the invention has been described with reference to specific embodiments, it is to be understood that it is intended to cover all modifications and equivalents within the scope of the appended claims.

What is claimed is: I

1. A method of punching out blanks from sheet material by means of strip-steel punch knives and a pressure plate, comprising placing said material on a base plate,

placing said knives on said material, placing said pressure plate on said knives to complete a stack, passing the assembled stack once through a punching device having continuously operating upper and lower pressure rollers, driving said rollers continuously in the same direction whereby they rotate in opposite directions relative to each other, and returning said pressure plate to its initial position by raising said pressure plate and passing it backwards over said upper roller in contact with said upper roller whereby the upper roller moves the pressure plateback to its starting position to form a second assembly for a second punching operation in which the same pressure plate is employed in combination with punch knives and a different base plate and material.

2. The method of claim 1, in which said step of returning said pressure plate comprises raising said pressure plate, inserting magnetic means between said pressure plate and said knives for arranging the knives in a predetermined positional pattern whereby said magnetic means operates to retain said knives in said pattern, and returning said pressure plate and magnetic means with the knives attached thereto to said initial position on said different material.

3. An apparatus for punching out blanks from sheet material by means of strip-steel punching knives and a pressure plate, comprising a punching device having a feeding input and an output, first conveyor means located upstream of said feeding input as viewed in the direction of work flow and second conveyor means located downstream of said output for feeding a stack comprised of a base plate, material to be punched, strip-steel punching knives, and a pressure plate through said punching device, said apparatus further comprising first and second carrier roller means movably supported above said first and second conveyor means respectively for selectively raising and lowering said pressure plate for returning it to its upstream starting position.

4. The apparatus of claim 3, further comprising magnetic holding means for holding and transporting said punching knives without changing their positions relative to each-other, and means for inserting said magnetic holding means between said pressure plate and knives at said second conveyor means.

5. The apparatus of claim 4, comprising strip-steel punching knives having iron cores for cooperation with said magnetic holding means.

6. The'apparatus of claim 3, wherein said punching device is a rolling mill having an upper pressure roller and a lower pressure roller with a gap therebetween for passing said stack through the gap, and drive shafts for continuously driving said rollers in the same direction whereby the rollers rotate in opposite directions.

7. The apparatus of claim 6, wherein said first conveyor means upstream of said punching device comprise a plurality of conveyor rollers arranged side by side in a row with parallel axes which are also parallel to the axes of said pressure rollers, the top of said conveyor rollers defining a first plane which is displaced downwardly from a second plane extending horizontally and tangentially to the top of said lower pressure roller. v

8. The apparatus of claim 7, wherein said first and second planes extend in parallel to each other and normal to the plane defined by the axes of said pressure rollers.

9. The apparatus of claim 6, further comprising means for passing said pressure plate across the top of said upper pressure roller and in contact therewith from said output to said feeding input.

10. The apparatus of claim 9, wherein said means for passing comprises means. for sensing a pressure plate raised by said second carrier roller means to the level of the top of said upper pressure 'roller, and means responsive to said sensing means for urging the pressure plate into rolling contact with said upper pressure roller.

11. The apparatus of claim 3, further comprising plane-parallel guide means for selectively raising and lowering said first and second carrier roller means.

12. The apparatus of claim 3, comprising a frame, electromagnetic means in said frame, means at said output for moving a pressure plate from said second carrier roller means onto said electromagnetic means, and means for clamping said pressure plate to said electromagnetic means and for returning said assembled pressure plate and electromagnetic means onto punch knives at said second conveyor means, whereby said electromagnetic means hold said punch knives in determined positions relative to each other.

13. The apparatus of claim 12, wherein said electromagnetic means comprise elongated electromagnets having rollers at their ends, and a track in said frame in which said last mentioned rollers are guided, whereby said electromagnets can be selectively positioned in said frame.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent N 3 ,8OO,6 Il Dated Anril 2. 197

Inventor) Ernst M. Spengler It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

[73] Assignee: Stanztechnik GmbH Roeder & Spengler Bergen-Enkheim y Signed and Scalzd this [SEAL] Attest:

RUTH C. MASON C. IAISIIALL DANN Arresting Officer Commissioner 01bit. and Trademarks thirtieth Day of Deamber 1975

Claims (13)

1. A method of punching out blanks from sheet material by means of strip-steel punch knives and a pressure plate, comprising placing said material on a base plate, placing said knives on said material, placing said pressure plate on said knives to complete a stack, passing the assembled stack once through a punching device having continuously operating upper and lower pressure rollers, driving said rollers continuously in the same direction whereby they rotate in opposite directions relative to each other, and returning said pressure plate to its initial position by raising said pressure plate and passing it backwards over said upper roller in contact with said upper roller whereby the upper roller moves the pressure plate back to its starting position to form a second assembly for a second punching operation in which the same pressure plate is employed in combination with punch knives and a different base plate and material.
2. The method of claim 1, in which said step of returning saiD pressure plate comprises raising said pressure plate, inserting magnetic means between said pressure plate and said knives for arranging the knives in a predetermined positional pattern whereby said magnetic means operates to retain said knives in said pattern, and returning said pressure plate and magnetic means with the knives attached thereto to said initial position on said different material.
3. An apparatus for punching out blanks from sheet material by means of strip-steel punching knives and a pressure plate, comprising a punching device having a feeding input and an output, first conveyor means located upstream of said feeding input as viewed in the direction of work flow and second conveyor means located downstream of said output for feeding a stack comprised of a base plate, material to be punched, strip-steel punching knives, and a pressure plate through said punching device, said apparatus further comprising first and second carrier roller means movably supported above said first and second conveyor means respectively for selectively raising and lowering said pressure plate for returning it to its upstream starting position.
4. The apparatus of claim 3, further comprising magnetic holding means for holding and transporting said punching knives without changing their positions relative to each other, and means for inserting said magnetic holding means between said pressure plate and knives at said second conveyor means.
5. The apparatus of claim 4, comprising strip-steel punching knives having iron cores for cooperation with said magnetic holding means.
6. The apparatus of claim 3, wherein said punching device is a rolling mill having an upper pressure roller and a lower pressure roller with a gap therebetween for passing said stack through the gap, and drive shafts for continuously driving said rollers in the same direction whereby the rollers rotate in opposite directions.
7. The apparatus of claim 6, wherein said first conveyor means upstream of said punching device comprise a plurality of conveyor rollers arranged side by side in a row with parallel axes which are also parallel to the axes of said pressure rollers, the top of said conveyor rollers defining a first plane which is displaced downwardly from a second plane extending horizontally and tangentially to the top of said lower pressure roller.
8. The apparatus of claim 7, wherein said first and second planes extend in parallel to each other and normal to the plane defined by the axes of said pressure rollers.
9. The apparatus of claim 6, further comprising means for passing said pressure plate across the top of said upper pressure roller and in contact therewith from said output to said feeding input.
10. The apparatus of claim 9, wherein said means for passing comprises means for sensing a pressure plate raised by said second carrier roller means to the level of the top of said upper pressure roller, and means responsive to said sensing means for urging the pressure plate into rolling contact with said upper pressure roller.
11. The apparatus of claim 3, further comprising plano-parallel guide means for selectively raising and lowering said first and second carrier roller means.
12. The apparatus of claim 3, comprising a frame, electromagnetic means in said frame, means at said output for moving a pressure plate from said second carrier roller means onto said electromagnetic means, and means for clamping said pressure plate to said electromagnetic means and for returning said assembled pressure plate and electromagnetic means onto punch knives at said second conveyor means, whereby said electromagnetic means hold said punch knives in determined positions relative to each other.
13. The apparatus of claim 12, wherein said electromagnetic means comprise elongated electromagnets having rollers at their ends, and a track in said frame in which said last mentioned rollers are guided, whereby said electromagnets can be selectively positioned in said frame.
US3800641A 1968-12-17 1971-08-13 Blank punching method and apparatus Expired - Lifetime US3800641A (en)

Priority Applications (1)

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DE19681815115 DE1815115B2 (en) 1968-12-17 1968-12-17 rolling punch

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US3800641A true US3800641A (en) 1974-04-02

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US (1) US3800641A (en)
DE (1) DE1815115B2 (en)
DK (1) DK125658B (en)
ES (1) ES373420A1 (en)
FR (1) FR2026321A1 (en)
GB (1) GB1277507A (en)
NL (1) NL6917121A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867859A (en) * 1974-02-06 1975-02-25 John L Hirons Machine for forming indicia for sand blasting
US4092890A (en) * 1977-03-29 1978-06-06 Etablissements Tiflex Societe Anonyme Stencil-cutting machine
US4685363A (en) * 1985-05-22 1987-08-11 Gerber Scientific, Inc. Apparatus and method for supporting and working on sheet material
US4860622A (en) * 1986-10-07 1989-08-29 Interdibipack S.P.A. Machine for cutting sheet material by means of a dinking die
US5012713A (en) * 1989-12-18 1991-05-07 Progressive Service Die Company Die power pack for cutting apparatus
US20070292575A1 (en) * 2004-09-23 2007-12-20 Alon Ofir Machinery And Method For Manufacturing Shaped Pita Bread
CN105256083A (en) * 2015-10-23 2016-01-20 苏州天裁纺织工艺品有限公司 Conveying and cutting mechanism for outer earmuff leather

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567060B1 (en) * 1984-07-06 1987-01-23 Forest Line Sa Device materials of cutters
GB8821041D0 (en) * 1988-09-07 1988-10-05 Team Tool Co Ltd Rotary die-cutting presses

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US835522A (en) * 1905-01-19 1906-11-13 Charles Leander Higgins Rubber-cutting machine.
US2121004A (en) * 1933-09-23 1938-06-21 Detroit Gasket & Mfg Co Method of cutting material
US2168400A (en) * 1937-11-18 1939-08-08 Cottrell C B & Sons Co Method of separating blanks from sheet material
US2788069A (en) * 1954-11-30 1957-04-09 Cluett Peabody & Co Inc Method and means of subdividing sheet material into pieces
US3077807A (en) * 1962-07-23 1963-02-19 Falls Engineering And Machine Roller die apparatus
US3301110A (en) * 1964-12-07 1967-01-31 Blankmaster Inc Means and method of roll forming and punching
US3570340A (en) * 1968-02-13 1971-03-16 Packaging Ind Inc Roller diecutting machine or the like

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US835522A (en) * 1905-01-19 1906-11-13 Charles Leander Higgins Rubber-cutting machine.
US2121004A (en) * 1933-09-23 1938-06-21 Detroit Gasket & Mfg Co Method of cutting material
US2168400A (en) * 1937-11-18 1939-08-08 Cottrell C B & Sons Co Method of separating blanks from sheet material
US2788069A (en) * 1954-11-30 1957-04-09 Cluett Peabody & Co Inc Method and means of subdividing sheet material into pieces
US3077807A (en) * 1962-07-23 1963-02-19 Falls Engineering And Machine Roller die apparatus
US3301110A (en) * 1964-12-07 1967-01-31 Blankmaster Inc Means and method of roll forming and punching
US3570340A (en) * 1968-02-13 1971-03-16 Packaging Ind Inc Roller diecutting machine or the like

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867859A (en) * 1974-02-06 1975-02-25 John L Hirons Machine for forming indicia for sand blasting
US4092890A (en) * 1977-03-29 1978-06-06 Etablissements Tiflex Societe Anonyme Stencil-cutting machine
US4685363A (en) * 1985-05-22 1987-08-11 Gerber Scientific, Inc. Apparatus and method for supporting and working on sheet material
US4860622A (en) * 1986-10-07 1989-08-29 Interdibipack S.P.A. Machine for cutting sheet material by means of a dinking die
US5012713A (en) * 1989-12-18 1991-05-07 Progressive Service Die Company Die power pack for cutting apparatus
US20070292575A1 (en) * 2004-09-23 2007-12-20 Alon Ofir Machinery And Method For Manufacturing Shaped Pita Bread
CN105256083A (en) * 2015-10-23 2016-01-20 苏州天裁纺织工艺品有限公司 Conveying and cutting mechanism for outer earmuff leather

Also Published As

Publication number Publication date Type
DE1815115A1 (en) 1970-09-10 application
DK125658B (en) 1973-03-19 grant
FR2026321A1 (en) 1970-09-18 application
NL6917121A (en) 1970-06-19 application
GB1277507A (en) 1972-06-14 application
ES373420A1 (en) 1972-02-01 application
DE1815115B2 (en) 1973-02-01 application

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