MXPA95000823A - Compressive cutting mechanism with plura filter cutter - Google Patents

Abstract

The present invention relates to a cutting mechanism for counting a workpiece by compression, comprising: a press for supporting a workpiece, a mobile counter holder to and from the press, an elongated cutter removably mounted on the support cutter, so as to be movable together with the counter holder to and from the press, and with a polygonal cross-sectional configuration comprising a plurality of surfaces arranged at predetermined angles with respect to each other, in order to define a plurality of edges elongate and parallel cutters in the intersecting geometries of these surfaces, where one of the cutting edges projects towards the press when the cutter is mounted inside the counter support, where the cutter is removable from the support when the cutting edge projecting towards the press the edge and it is removable inside the cutter support so that another one between the plurality of cutting edges projecting towards the press, and a mounting device defined on the cutter support for joining the cutter surfaces, and a notch device defined within the cutter holder to accommodate the cutting edges of the cutter, which does not they project towards the press and are not used at a predetermined time for a cutting operation, such that the cutting edges that are not used for a cutting operation are free of contact with the cutter support, so that the support Cutter does not prematurely dull the cutting edges, as they are not used for a cutting operation, before being used in cutting operations.

Description

Compressive Cutting Mechanism With Plural Fillet Cutter INVENTORS: Janusz Figiel.- American nationality.

* Address: 2012 Seneca Lane, Mount Prospect Illinois, E.U.A. Peter Drabarek, -United American nationality. - Address: 5508 West Leland Avenue, Chicago, Illinois, E.U.A. Owner: Signode Corporation Nationality: From the State of Delaware, E.U.A. Address: 3610 West Lake Avenue, Glenview, Illinois 60025 E.U.A. Technical Field of the Invention This invention relates to a cutting mechanism particularly useful, but not exclusively, in a fastening tool with strapping of a type used to apply a steel strap in a tensioned loop around a package through a series of interlocking joints that * comprise interlocking shoulders pierced at two overlapped ends of the strap. In the cutting mechanism, a cutter having plural cutting edges is mounted on a fastener and is movable with the fastener, toward and away from an anvil. This invention contemplates that the cutter is removable from the fastener when one of the plural edges loses edge and can be reassembled to allow another edge to be used then.

* Background of the Invention A version of a strapping tool of the type noted above is disclosed in U.S. Patent No. 3,998,429 to Cheung. Certain aspects of a later version of said manual strap fastening tool are disclosed in U.S. Patent Number 5,303,541 to Nix. Various aspects of another more recent version of said strap fastening tool are disclosed in two patent applications registered simultaneously on October 8, 1993, under United States Patent Application Serial Number 08 / 133,284 and the US Patent Number. U.S. Patent Application Series 08 / 133,290 respectively, and commonly assigned herein. U.S. Patent Number 4,825,512 provides a useful example of a steel strip having a * series of interlocking joints formed by perforated shoulders at their overlapped ends. Generally, a strapping tool of the type noted above comprises an actuator crank, which is arranged to be manually oscillated. The actuator crank rotates an output shaft, which drives a series of cams, through an input shaft, to which the actuator crank is coupled, and through intermediate gears. Several of the cams do * perforations, which pierce the interlocked shoulders at two overlapping ends of a steel strip. One of the cams drives a cutter, which cuts through one of the outer overlapped ends of the compressively applied strip, in such a way that it cuts off any excess strip of the applied strip and desirably if cutting one of the overlapping inner ends. An anvil supports the overlapped ends as the cutter compressively cuts through the outer overlapped end. Generally, the cutter has been provided with a cutting edge, which eventually loses its edge. Generally, it is inconvenient to remove the cutting edge or replace the cutter, which has been a costly component until now. Clamping tools with manual strips as indicated above are available from Signode Industry Packaging Systems (a unit of Illinois Tool Works Inc.) of * Glenview, Illinois, under its SIGNODE trademark. One such commercially available tool (SIGNODE Model SMC-12/58/34 Combination Strapping Tool) includes a removable cutter, which has a single blade, and which is designed to slide to and from a small cavity found inside a cutter holder in such a way that replacement of the removable cutter is facilitated. Summary of the Invention This invention provides a cutting mechanism that is particularly useful, but not exclusively in a fastening tool with straps of the type indicated above. In said strapping tool, the cutting mechanism is used to cut compressively through an outer end of two overlapped ends of a steel strip, since the overlapped ends rest on an anvil. It is envisioned that the cutting mechanism has other uses, such as in a wire cutting tool, a tree pruning tool, or other tool to compressively cut a work piece. Generally, the cutting mechanism comprises an anvil arranged to support the workpiece, a movable cutter holder movable to and from the anvil, and an elongated cutter removably mounted on the holder and movable together with the holder, to and from the anvil. In a clamping tool with straps of the type * noted above, the anvil is arranged to support the overlapped ends of said strap when the overlapped ends are supported by the anvil, and the cutter is removably mounted on the clip in such a manner as to extend transversely relative to the overlapped ends of said clip. strapping when said ends are supported by the anvil. The cutter has plural, elongated and parallel edges. One of the cutting edges projects towards the anvil when the cutter is mounted on the fastener. The cutter is removable from the fastener when the edge projecting towards the anvil loses its edge and can be reassembled in the fastener in such a way that another edge projects towards the anvil. In a preferred arrangement, the fastener has a small cavity that has an open end having an elongated slot that opens from the elongated small cavity toward the anvil and defining two opposite ends that retain the cutter. Moreover, the cutter is configured to fit lengthwise in the small cavity when the cutter is mounted on the fastener. Furthermore, one of the edges protrudes through the slot and projects towards the anvil when the cutter is mounted on the slot. Preferably, the cutter has a polygonal profile. More preferably, the profile of the cutter can be triangular, possibly equilateral, or quadrilateral, possibly rhombic or square. An equilateral triangular profile is more preferred, because it provides three sharp edges that define acute angles (60 °), which are desirable for cutting the steel strip with a cutter made with hardened tool steel. These and other objects, features and advantages of this invention are apparent from the following description of a preferred embodiment of this invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a partially exploded and fragmentary perspective view of a strapping tool of the type indicated above. The strapping tool incorporates a cutting mechanism that constitutes a preferred embodiment of this invention. Figure 2, on an enlarged scale, is an exploded perspective view of a cutter holder, an elongated cutter having an equilateral triangular profile, a roller, an axis for the roller and a bypass spring, as the mechanism is employed. of cut. The Figure, on an even larger scale, is an upper plane of the cutter holder, the elongated cutter and the other elements shown in Figure 2, except for the bypass spring, which is hidden. Figure 4 is a front elevation of the cutter holder, the elongated cutter and the other elements of Figure 2. A cam that comes into contact with this is shown fragmentarily, two overlapping ends of a steel strip, an anvil supporting the overlapped ends and a stepped portion of a base sheet. Figure 5 is a partially fragmentary lateral elevation of the cutter holder, elongated cutter and the other elements shown in Figure 4.

Figure 6 is a lower plane of the fastener of the '* cutter and elongated cutter. Figures 7 and 8 are perspective views of two alternative cutters, each having a square profile and a rhombic profile. DETAILED DESCRIPTION OF THE PREFERRED INCORPORATION As shown in Figure 1, a strapping tool 10 is used to apply a steel strap in a loop tensioned around a package through a series of interlocking joints comprising perforated interlockable shoulders. in two overlapping ends of a strap. The strapping tool 10 incorporates a cutting mechanism 100 which constitutes a preferred embodiment of this invention. As shown in Figures 4 and 5, wherein the overlapped ends of the steel strip being applied around a package (not shown) are shown * fragmentarily, the cutting mechanism 100 is used to compressively cut through the outer end 12 of the steel strip being applied, in such a way that it cuts any excess of strip from the steel strip that is being applied without cutting the inner end 14 of the steel strip that is being applied. Except for the cutting mechanism 100, the strapping tool 10 is similar to the strapping tool disclosed in United States Patent Application Serial No. 08 / 133,284 and the United States Patent Application. Serial No. 08 / 133,290 noted above, the disclosures of which are incorporated herein by reference. The strapping tool 10 comprises a driving handle, which is coupled to an input shaft 22, and which is arranged to be manually oscillated in such a manner as to impart oscillatory rotation to the input shaft 22.

# As disclosed in United States Patent Application Serial No. 08 / 133,290, the oscillatory rotation of the input shaft 22 is converted into unidirectional rotation of an output shaft 26, through a set of bevel gears 24 Four cams 30, 32, 34, 36 are coupled to the output shaft 26 in such a way that they rotate together with the output shaft 26. The cams 30, 32, 34 drive three perforators 40, 42, 44 that pierce the interlocking shoulders in the # overlapping ends 12, 14, of the steel strip being applied. Punches (not shown) that act in conjunction with the perforators 40, 42, 44 underlie the overlapped ends 12, 14 of the steel strip being applied. The cam 36, which has a single lobe 38, is used to drive the cutting mechanism. The cutting mechanism 100 comprises an anvil 102, which is mounted on a lower step 104 of a staggered platform 106 fixed or formed in a base sheet 108 of the strapping tool 10. The anvil 102 supports the overlapped ends 12, 14 , of the steel strip as the outer end 12 is compressively cut. The cutting mechanism 100 comprises a cutter holder 110, which is mounted within the fastening tool with straps 10 such that it is vertically movable within a limited range of vertical movement and an elongated cutter 120, which is removably assembled in the cutter holder 110. Therefore, the cutter holder 110 and the elongate cutter 120 are movable to and from the anvil 102. The cutting mechanism 100 comprises a bypass spring 112, which is made of roll wire, and which is arranged to derive the cutter holder 100 and the cutter 120 away from the anvil 102. As shown in Figures 2, 4, 5 and 6, the elongate cutter 120 is machined from tool steel in such a way that it is have an equilateral triangular profile that provides three parallel edges 122 that define acute angles (60 °). As shown in Figures 2 to 6, the cutter holder 110 is machined such that it has an elongated small cavity 124 having an open end 126 and an elongated slot 126 that opens downwardly from the elongated small cavity. 124, to the anvil 102 and defining two opposite ends 128. The elongated cutter 120 is configured to fit lengthwise in the * elongate small cavity 124 such that one of the edges 122 protrudes downwardly through the elongated slot 126, between the opposite ends 128, when the elongate cutter 120 is mounted on the cutter holder 110. When the elongated cutter 120 is mounted on the cutter holder 110, the opposite ends 128 retain the elongate cutter 120 such that the elongate cutter 120 can not fall out of the elongated small cavity 124, through the elongated slot 126. Also, an upper wall 130 of the elongated small cavity 124 and the opposite ends 128 act together in such a way as to prevent the elongate cutter 120 from rotating inside the elongated small cavity 124. In addition, a rear end 132 of the elongated cutter 124 is retained by a rear stop 134 , which is an integral part of the elongated cutter 120. At the open end 124 of the elongated small cavity 124, a front end 136 of the elongate cutter 120 is re held by a cover 138 (see Figure 1) of the strapping tool 10. The cover 138 is removable to provide access to the cutter holder 110 and for the elongate cutter 120. As shown in Figures 2, 3, 5 and 6 the cutter holder 110 is machined in such a manner as to define a small semi-cylindrical cavity 140, which opens back and down and in where the bypass spring 112 is disposed. A lower end 144 of the spring of * branch 112 comes into contact with an upper step 146 of the stepped platform 106. An upper end 148 of the bypass spring 112 comes into contact with a transverse portion 150 of the cutter holder 110. The bypass spring is compressed in such a way that The drift of the cutter 110 and the elongate cutter 120 is directed upwardly away from the anvil 102. As shown in Figures 2 to 6, the cutter holder is machined such that ^ P ^ defines a small cavity that accommodates an roller 160 between two side walls 162. Each side wall 162 has a circular opening 164, which is aligned axially with the circular opening of the other wall 162. A roller 170 is rotatably mounted within the small cavity that accommodates a roller 160 through an axis 162 received by the circular openings 164 of the side walls 162, in such a way that it extends partially over the side walls 162. The spring Derrick 140 derives cutter holder 110 and elongated cutter 120 upwardly such that roller 170 contacts and cooperates with cam 36 having a single lobe. Except when the cam 36 is rotated in such a way that the single lobe 38 engages the roller 160, the cam 36 allows the cutter holder 110 and the elongate cutter 120 to move upwardly away from the anvil 102, as they are derived by the spring of derivation 140.

When the cam 36 is rotated in such a manner that the single lobe 38 begins to engage with the roller 160, the single lobe moves the roller 170 downwardly in such a manner as to urge the cutter holder 110 and the elongated cutter 120 downward toward the anvil 102, as opposed by the bypass spring 140. As shown in Figures 4 and 5, when the cutter holder 110 and the elongate cutter 120 are driven downward by the single lobe 38 of the cam 36, he ? cutting edge 122 projecting downward towards the anvil 102 compressively cuts the outer end 12 of the steel strip without cutting the inner end thereof, as the overlapped ends 12, 14 are supported by the anvil 102. Once the single lobe 38 of the cam 36 has passed the roller 160, the bypass spring 140 moves the cutter holder 110 and the elongated cutter 120 upwards away from the anvil 102, and away from the cut end 12 of the steel strip. When the edge 122 projecting downward loses edge after repeated use of the strapping tool 10, the cover 138 is removed to provide access to the cutter holder 120 and the elongate cutter 120. The elongated cutter 120 can then removed from the cutter holder 110, rotated in such a manner that another edge 122 projects downward and is again mounted on the cutter holder 110. There is no need, therefore, to replace the elongated cutter 120 until the three edges cut 122 have lost the edge. As shown in Figures 2, 4, 5 and 6 the elongated cutter 120 is machined such that it has a triangular profile, which provides three cutting edges 122 which define acute angles (60 °). As shown in Figure 7, an elongated cutter 120 'machined from tool steel such that it has a square profile that provides four edges that define right angles (90 °) can be used alternatively, if a fastener is provided. cutter (not shown) having a groove suitably configured to mount a 120 'elongated cutter but which is similar to cutter holder 110 in other aspects. As shown in Figure 8, an elongated cutter 120"machined from tool steel in such a way that it has a rhombic profile that provides two sharp edges defining acute angles. # (60 °) and two other ends defining obtuse angles (120 °) may alternatively be used, if provided, a cutter holder (not shown) having a groove suitably configured to mount the elongate cutter 120"and which is similar to cutter holder 110 in other aspects Several modifications may be made to the preferred embodiment described above without departing from the scope and spirit of this invention. ? *

Claims (8)

1. NOVELTY OF THE INVENTION Having described the foregoing invention, the following are claimed as property: CLAIMS: 1. To compressively cut a workpiece, a cutting mechanism comprising an anvil arranged to support a workpiece, a movable cutter holder to and from the anvil and an elongated cutter removably mounted on the holder and movable together with the holder, to and from the anvil, the cutter having plural, elongate and parallel cutting edges, one of which projects towards the anvil when the cutter is mounted on the fastener, the cutter being removable from the fastener when the edge projecting towards the anvil loses its edge and can be reassembled in the fastener in such a way that another edge projects towards the anvil.
2. 2. The cutting mechanism of claim ^^ 1 wherein the fastener has a small elongated cavity with an elongated slot that opens toward the anvil and defines two opposite ends that retain the cutter when the cutter is mounted on the fastener, and wherein the cutter is configured to fit lengthwise in the small cavity with one of the cutting edges protruding through the slot and projecting towards the anvil when the cutter is mounted on the fastener.
3. 3. The cutting mechanism of the claim 2 where the cutter has a polygonal profile.
4. 4. The cutting mechanism of the claim 3 where the edge is triangular
5. 5. The cutting mechanism of the claim 4 where the profile of the cutter is equilateral.
6. 6. The cutting mechanism of claim 3 wherein the profile of the cutter is quadrilateral.
7. 7. The cutting mechanism of claim 6 wherein the profile of the cutter is rhombic.
8. 8. Cutting mechanism of claim 6 wherein the profile of the cutter is square. Extract of the Invention A cutting mechanism is disclosed, which is useful in a strapping tool of the type used to apply a steel strap in a loop tensioned around a package through a series of interlocking joints comprising shoulders interlockables punched at the overlapped ends of the strap. The cutting mechanism comprises an anvil arranged to support the overlapped ends of said strap, a movable cutter holder movable to and from the anvil, an elongated cutter removably mounted on the fastener in such a manner that it extends transversely relative to the ends overlapping said strap when the overlapped ends of said strap are supported by the anvil. The cutter is movable together with the fastener, to and from the anvil. The cutter has a polygonal profile that defines plural, elongated and parallel edges, one of which projects towards the anvil when the cutter is • Mounts in the bra. The cutter, which is removable from the fastener when the edge projecting towards the anvil loses its edge, can be reassembled in the fastener in such a way that another edge projects towards the anvil. The profile of the cutter can be triangular, preferably equilateral, or quadrilateral, preferably rhombic or square. The most preferred is an equilateral triangular profile. The cutting mechanism has another utility, as well as a tool for fastening on straps of the type indicated above. IN WITNESS WHEREOF, the previous description has been signed, as well as the claims of Novelty of the Invention, as agent of SIGNODE CORPORATION, in. Mexico City, Federal District; Mexican Republic, on the 6th day of the month of February 1995. p.p. S? GNODE CORPORATION GZM / rpf.