US3827323A

US3827323A - Overhung shear

Info

Publication number: US3827323A
Application number: US00753998A
Authority: US
Inventors: K Jacobs
Original assignee: Meyer Roth and Pastor Maschinenfabrik GmbH
Current assignee: Meyer Roth and Pastor Maschinenfabrik GmbH
Priority date: 1967-08-23
Filing date: 1968-08-20
Publication date: 1974-08-06
Anticipated expiration: 1991-08-06
Also published as: SE361836B; GB1180875A; DE1627233C3; FR1586420A; BE719809A; CH479357A; DE1627233A1; DE1627233B2

Abstract

An overhung or flying shear for cutting wire or band sections or the like from moving articles, such as rods, bands or the like, is provided with a slide for the cutting chuck, the slide being movable parallel to the direction of this movement by a crank drive which actuates at the same time the knife guided by the slide, the shear being particularly characterized by a transmission member which is directly connected with the connecting rod of the crank drive and which directly moves the knife.

Description

Unid States atent [191 [11] 3,827,323 Jacobs Aug. 6, 1974 OVERHUNG SHEAR Inventor: Klaus Jacobs, Cologne-Raderthal,

Germany Assignee: Meyer, Roth & Pastor,

Cologne-Raderberg, Germany Filed: Aug. 20, 1968 App]. No.: 753,998

Foreign Application Priority Data Aug. 23, l968 Germany 1627233 U.S. Ci 83/310, 83/320, 83/580 int. Cl B2301 25/02 Field of Search 83/285, 310, 315-320,

References Cited UNITED STATES PATENTS Traut 83/3l8 X Primary Examiner-Andrew R. .luhasz Assistant Examiner-Leon Gilden Attorney, Agent, or Firm-Richards & Geier; U. Alexander Scher An overhung or flying shear for cutting wire or band sections or the like from moving articles, such as rods, bands or the like, is provided with a slide for the cutting chuck, the slide being movable parallel to the direction of this movement by a crank drive which actuates at the same time the knife guided by the slide, the shear being particularly characterized by a transmission member which is directly connected with the connecting rod of the crank drive and which directly moves the knife.

ABSTRACT 7 Claims, 4 Drawing Figures PAIENIEDAUB 51914 SHEET 3 [IF 4 INVENTOR BY J ATTA'QRNEES PATENTED 533 51974 SHEET [1F 4 IN VENTOR K] ac a [35 ATT QrLNlESS OVERHUNG SHEAR This invention relates to an overhung or flying shear for cutting wire or band sections or the like from moving articles.

Prior art shears of this type operate in that a wire pulled away, for example, from bands, spools, reels and the like with a uniform but adjustable speed is guided through a directing device and is directed to a reciprocating cutting device. This reciprocating movement is provided by a crank drive which drives a slide with a cutter box. The number of revolutions of the crank drive is approximately adjusted to the speed of withdrawal and the cutting moment is so selected that the momentary speed of the crank drive during the cutting corresponds substantially to the invariable removal speed of the wire. A knife is guided by the slide and, in accordance with this prior art construction, is moved directly by the crank drive in a guide extending perpendicularly to the direction of movement of the wire. The movement of the crank drive is transmitted to the knife by a number of levers, particularly three levers, one of which is a two-armed lever pivoted to the slide and connected on the one hand by a link to a substantially central point of the connecting rod, and on the other hand, connected by another link with the knife.

This known construction is expensive since it provides three additional transmitting means between the connecting rod and the knife. Furthermore, it has the drawback that it is provided with a total of five link locations or joints which are subject to wear and can become loose. Finally,and this is the most important drawback,this construction is not only expensive but is also exceptionally heavy which is detrimental since all the transmitting means participate in the reciprocating movement of the slide and thus must be accelerated and retarded. The forces which are thereby produced are quite substantial, particularly in case of high cutting speeds, and result, as already stated, in an untimely wear.

An object of the present invention is to eliminate these drawbacks of prior art construction and to produce a new construction which is considerably simpler, which operates with a lesser number of transmission means, which has a smaller number of joints and which thus has a lesser weight and lesser mass forces, while producing a clean cut at high output.

Other objects of the present invention will become apparent in the course of the following specification.

In the accomplishment of the objectives of the present invention the prior art construction with a single crank drive for all parts was improved by providing only one transmitting member connected directly with the connecting rod of the crank drive and directly actuating the knife.

According to a preferred embodiment of the present invention the connecting rod itself is provided with a second free arm the end of which has a guide for the knife, the guide having the shape of a segment of a circle and being coaxial to a bearing point in the slide; the knife is angularly adjustable upon the guide.

This construction avoids all additional link connections so that only the two bearing supports for the connecting rod are necessary. The circular knife can be set in any desired angular position, so that the cutting point can be adjusted precisely to the prevailing feed speed of the wire.

If a particularly simple construction is considered to be adequate, then only one crank drive is used, but in that case the knife must be shifted sidewise relatively to the connecting rod, so that the wire can move along a straight line. If the knife is not shifted then a crossed crank drive is necessary. Such a construction is also possible. However, it is also possible to provide a symmetrical construction with two coaxial connecting rods which are interconnected by means of a knife holder, so that there is room between the two connecting rods for the moving wire. This construction is preferred for wires of larger diameters.

The simple embodiment having only one crank drive and a knife shifted sidewise in relation to the connecting rod is advantageously so constructed that the free arm of the connecting rod extends at an angle to the crank connected arm which is not and is for example, an obtuse angle, whereby it is particularly advantageous to locate the direction of movement of the wire to the other side of the connecting rod and shift it to the side relatively to the bearing of the connecting rod, thereby providing free passage for the wire, the adjacent constructional parts being provided with insignificant recesses and cutouts for this free passage.

When the above described construction is used with a knife having the shape of a circle segment, there is the advantage that an adjusting screw can be provided at the free arm for the knife, which can be held sidewise in a dove-tail slot and can be tensioned, so that the angular setting of the knife in relation to the connecting rod or to the free arm is possible by setting the adjusting screw; the supporting connection does not present difficulties since the adjusting screw receives the cutting forces and transmits them to the connecting rod.

An embodiment which, if desired, may be used in this connection consists in that the knife is directly and firmly held in the free arm, although it is replaceably mounted, while the free arm can be angularly adjustable in relation to the crank-held arm of the connecting rod.

A basically different embodiment of the flying shear of the present invention is developed from the known construction wherein the knife is not guided circularly but along a straight line at the slide and extends perpendicularly to the direction of movement of the wire.

The present invention can also be applied to this known construction, provided that the transmitting member again firmly connects the free arm with the crank-held arm of the connecting rod but that the end of the free arm is allowed to engage in a linklike manner a corresponding recess in the knife holder. The knife can be held replaceably in the known manner in the knife holder but can be adjusted longitudinally in accordance with the present invention to fix the precise engagement range. While this embodiment has one more joint than the one previously described, it provides a saving of four joints and their corresponding transmitting elements in comparison with the prior art construction.

Another embodiment of the present invention which also retains the possibility of guiding the knife along a straight line in the slide can be constructed by linking the knife or its rodlike holder directly to the connecting rod, so that it serves at the same time as the means moving the slide, the knife taking the slide along by its own guide but perpendicularly thereto. Then the reciprocating end of the connecting rod runs empty, since it transmits no movement to the slide.

This embodiment provides the following further advantage: it is possible to move the reciprocating end of the connecting rod in a way different from that of a straight guide. By way of example, this end can be guided over a fixed swing along a circle or along any desired curve. This makes it possible to influence the movements of the knife in any desired manner. The length of the swing can be made adjustable.

Similarly it is possible to shift other parts and lever lengths, particularly the eccentricity of the crank drive, to vary the cutting range or to adjust the cutting speeds as well as the feed speeds of the slide.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawings, showing by way of example, preferred embodiments of the intentive idea.

In the drawings:

F IG. 1 is a side view, partly in section, of a device of the present invention with a knife having the shape of a segment.

FIG. 2 is a transverse section along the line II-Il of FIG. 1.

FIG. 3 is a diagrammatic side view, illustrating a different construction.

FIG. 4 is also a diagrammatic side view illustrating yet another construction.

FIGS. 1 and 2 show an apparatus having a machine frame for an overhung shear for cutting wire sections. Not shown are a guiding device for the wire which is removed from a band and a device for receiving the wire band, which is located in front of the shear. The apparatus has a guide 11 for a slide 12 in which a cutting chuck 13 is replaceably fixed in a manner known in the art. The slide 12 is movable in the direction of movement of the wire 14 by a crank drive comprising a driving disc 14a (FIG. 2), a crank shaft 15, a crank disc 16 and a connecting rod 17. The shaft is supported in

ball bearings

18 and 19 carried by the machine frame 10. The crank pin 20 is fixed to a slide ring 21 or is made of one piece therewith. The slide ring 21 is movable longitudinally in a pin guide 22 and can be set by a setting screw 23 with setting nuts 24 and a counter-nut 25 in relation to the crank disc 16 in such manner that the eccentricity of the crank pin 20 and therefore the stroke of the slide 12 in the guides 11 can be varied. The connecting rod 17 is mounted by a needle bearing 26 in the crank pin 20 and has two arms, the free arm 27 extending at an obtuse angle to the arm 28 connected with the crank (FIG. 1). This free arm 27 carries upon an extension 28a a knife 29 having the shape of the segment of a circle. The knife 29 can be adjusted by a setting screw 30 in a guide 31 (FIG. 2) and can be rigidly fixed by a clamping device 32.

The operation of this construction is as follows:

Thus, the crank arm 27 is a one-piece unit, with the needle bearing 26 enclosing the pivot point, and the knife blade 29 is fastly secured thereto. The blade 29 is merely adjustable on the crank arm 27.

The operation of the whole device may be summarized as follows:

The driving disk 14a is rotated by any means not shown in the drawings. Its rotation is transmitted by a crank shaft 15, to which it is firmly connected to a crank disk 16 constituting a part of the crank shaft. The crank disk 16 has a recessed portion forming a pin guide 22. The slide ring 21 is movable in the pin guide 22. The crank pin 20 is fixed to the slide ring 21 and carries the needle bearing 26 supporting the connecting rod 17. The stroke of the slide 21 can be adjusted by a screw 23 and nuts 24 and 25. The connecting rod 17 has an arm 28 connected with the slide 12 and a bent arm 27 having an extension 27a carrying the cutting blade or knife 29 which is fixed in a clamping device 32. It is apparent that a movement of the rod 17 will cause the knife to cut the wire 14.

According to the embodiment of FIG. 3 the slide 12 movable in the guides 11 of the machine frame 10, is provided with a part 33 extended to a substantial extent under theguides and replaceably carrying at its lower free end the cutting chuck 13. A knife holder 34 is mounted in the slide 12 and its part 33. The knife holder 34 extends vertically and is slidable transversely to the direction of feed of the wire 14. The lower end of the holder 34 carries a chisel-like knife 35 which can be set longitudinally and fixed. The free arm 35a of the connecting rod 17 is aligned. in this construction with the arm 28 connected to the crank and has an end 36 having the shape of a cylinder head and engaging a correspondingly shaped slit 37 in the knife holder 34. When the crank disc 16 is rotated in the direction of the arrow 38, the crank disc will move the parts in the directions of the double arrow 39 in the guides 11', while the knife holder 34 will be moved transversely thereto in the direction of the double arrow 40.

In this construction the knife holder 34 moves in the direction of the double arrow 40 and firmly moves the knife 35. The slide 12 is pivotally connected with the arm 28 so that the slide 12 will oscillate horizontally. The free arm 35a oscillates at the same time along with the cylindrical head 36 relatively to the slide substantially in the vertical direction, so that the knife holder 34 will move vertically in the direction of the double arrow 40.

The embodiment of FIG. 4 is substantially similar to the construction of FIG. 3 as far as the shape of the slide 41 is concerned. However, in this construction the connecting rod 17" does not engage the slide directly but is connected to the upper end of the knife holder 42 which in other respects is substantially similar to the knife holder 34 of FIG. 3, namely, it is movable in the direction of the double arrow 40 while the slide 41 with the chuck 13" are movable in the direction of the double arrow 39. The connecting rod 17" is also provided with a free arm 44 which is aligned with the arm 43 connected to the crank. However, the free arm 44 has an end 45 guided by a link 46 the other end of which is fixed in a bearing 47. The knife 48 is movable longitudinally at an acute angle to the direction of the wire 14 and thus can be adjusted after wear. The height of the knife can be adjusted by an adjustment of the bearing 47.

It is apparent that the examples described above have been given solely by way of illustration and not by way of limitation and that they are capable of many variations and modifications within the scope of the present invention.

What is claimed is:

1. An overhung shear for the cutting of a movable wire and the like, comprising a slide, a cutting chuck carried by the slide, a knife guided by said slide and a crank drive having a connecting rod and a transmission member connected directly with said connecting rod and directly actuating said knife, said crank drive moving said slide parallel to the direction of movement of the wire.

2. An overhung shear in accordance with claim 1, comprising a guide adjustably supporting said knife, said knife having the shape of a circular segment and being located to the side of said connecting rod, said crank drive having a crank, said connecting rod having an arm connected with said crank and a free arm extending at an obtuse angle to said arm.

3. An overhung shear in accordance with claim 2, wherein said knife is fixed to a rear end of said free arm, said overhung shear comprising a setting screw carried by said free arm and actuating the rear end of said knife.

4. An overhung shear in accordance with claim 2, wherein said free arm is angularly adjustable in relation to said knife.

slide, said overhung shear having a knife holder carrying said knife and directly connected with said c0nnect ing rod, said knife holder moving said slide, and means for guiding the reciprocating end of said connecting rod.

7. An overhung shear in accordance with claim 6, wherein the last-mentioned means comprise a link guiding the reciprocating end along a curved path.

Claims

5. An overhung shear in accordance with claim 2, comprising a knife holder having a recess, said knife being longitudinally movable in said knife holder, said transmission member consisting of a free arm of the connecting rod, said connecting rod having a crank-connected arm connected with said free arm, said free arm having an end projecting into said recess.

6. An overhung shear in accordance with claim 1, whereiN said knife is guided along a straight line by said slide, said overhung shear having a knife holder carrying said knife and directly connected with said connecting rod, said knife holder moving said slide, and means for guiding the reciprocating end of said connecting rod.