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EP0418915A2 - Appareil À  couper - Google Patents

Appareil À  couper Download PDF

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Publication number
EP0418915A2
EP0418915A2 EP90118185A EP90118185A EP0418915A2 EP 0418915 A2 EP0418915 A2 EP 0418915A2 EP 90118185 A EP90118185 A EP 90118185A EP 90118185 A EP90118185 A EP 90118185A EP 0418915 A2 EP0418915 A2 EP 0418915A2
Authority
EP
European Patent Office
Prior art keywords
flap
cutting
chain body
cut
chain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90118185A
Other languages
German (de)
English (en)
Other versions
EP0418915B1 (fr
EP0418915A3 (en
Inventor
Katsumi C/O Shoohin Kaihatsu Center Mogi
Hiro C/O Shoohin Kaihatsu Center Ohzeki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Metal Corp
Mitsubishi Materials Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1247674A external-priority patent/JP2701478B2/ja
Priority claimed from JP29883589A external-priority patent/JPH03161215A/ja
Priority claimed from JP1322237A external-priority patent/JP2727711B2/ja
Priority claimed from JP12256290A external-priority patent/JPH03205111A/ja
Application filed by Mitsubishi Metal Corp, Mitsubishi Materials Corp filed Critical Mitsubishi Metal Corp
Priority to EP94109553A priority Critical patent/EP0623437B1/fr
Publication of EP0418915A2 publication Critical patent/EP0418915A2/fr
Publication of EP0418915A3 publication Critical patent/EP0418915A3/en
Application granted granted Critical
Publication of EP0418915B1 publication Critical patent/EP0418915B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/08—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with saw-blades of endless cutter-type, e.g. chain saws, i.e. saw chains, strap saws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains
    • B27B33/142—Cutter elements
    • B27B33/145—Cutter elements having plural teeth on a single link
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains
    • B27B33/142—Cutter elements
    • B27B33/144—Cutter elements having cutting inserts or exchangeable cutting teeth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains
    • B27B33/148—Saw chains with means permitting replacement of cutter elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/08—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with saw-blades of endless cutter-type, e.g. chain saws, i.e. saw chains, strap saws
    • B28D1/082—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with saw-blades of endless cutter-type, e.g. chain saws, i.e. saw chains, strap saws consisting of chain saws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/12—Saw-blades or saw-discs specially adapted for working stone
    • B28D1/124—Saw chains; rod-like saw blades; saw cables
    • B28D1/125—Saw chains; rod-like saw blades; saw cables with exchangeable cutter bits or cutter segments

Definitions

  • the present invention relates to a cutting apparatus for cutting large objects of different materials, such as stone, wood and other substances.
  • cutting a large stone is carried out with a cutting blade, a band saw, a wire saw and other cutting methods.
  • Cutting blade is a device containing a plurality of cutting bits in which chips of abrasive grains, such as fine diamond abrasive grains are firmly embedded.
  • the abrasive layers are bonded to an outer peripheral surface of a disc-like metal base formed by roll processing, by means of metal bond or the like at equal intervals.
  • the maximum cutting blade manufactured has a diameter of 3.5 m and a metal base thickness of 10 mm.
  • the maximum thickness of a material which can be cut is of the order of 1.5 m, and the cutting loss is of the order of 15 mm.
  • a band saw is a device having a thin strip of metal, which is wide and which is of the order of 1 mm to 6 mm in thickness, is welded to form an endless loop, and the abrasive grains and chips are firmly bonded to one side of the endless thin strip.
  • the endless thin strip driven by a pair of rotating circular wheels, whose axes are arranged in parallel relation to each other. The wheels are rotated at high speed, thereby cutting stones or the like with the edge of any parallel sections between the rotor bodies.
  • the wire saw is an endless loop device such that a plurality of cylindrical diamond chips is firmly bonded to a metal wire whose thickness is of the order of a few millimeters to 10 mm.
  • the wire saw is directly wound around the object, and is driven at high speeds with a constant tension applied by a drive apparatus, thereby cutting the object.
  • the cutting blade has the following problem. That is, if the diameter of the cutting blade is increased, the thickness of the metal base must also be increased to provide the blade rigidity. For this reason, the cutting loss increases, and the yield from the object is diminished. Further, twist or torsion occurs at the forvard edge of cutting as a result of an increase in the cutting resistance. Thus, the cutting accuracy is reduced.
  • the cutting blade has also the following problems. Since manufacturing of a metal base exceeding 3.5 meter in diameter is extremely difficult, there is a limit in thickness of the object capable of being cut, as described previously. Moreover, such large cutting blade is extremely inconvenient for handling and transporting or the like; also the noises due to vibration at cutting are severe.
  • the metal base is thin and long in length, and the cutting loss is of the order of 4 mm to 8 mm which is relatively small.
  • the yield is superior.
  • the band saw is wound around a pair of large-diameter rotating wheels, and accordingly, the cutting apparatus increases in size, and a large equipment space is required.
  • the band saw has the following problem. That is, bending stress is repeatedly applied to bent sections of the metal base wrapped around the rotating wheels and metal fatigue is apt to be accumulated in the metal base. Thus, the metal base is broken relatively prematurely, and the service life of the metal base is short.
  • the wire saw since the chips in the abrasive-­grain-layer are large in diameter, the cutting allowance must be large in comparison with the size of the cutting blade or the band saw. Further, the wire saw is circular in cross-section, and has, by itself, no means for restricting the cutting direction. Accordingly, the wire saw is inferior to other cutting methods in flatness and surface roughness of the cut surface. Furthermore, in the wire saw, since large bending stress is applied to both end portions of each of the abrasive-grain-layers during cutting, the service life is short. Breakage of the wire is dangerous because the ends of the wire jumps up and down like a whip.
  • An object of the invention is therefore to provide a cutting apparatus having improved performance characteristics with respect to the above discussed problems.
  • This invention relates to a cutting apparatus comprising;
  • This cutting apparatus provides cutting action by rotating the chain body equipped with cutting devices around at least a pair of sprockets to drive the chain body which is supported at the linear section of the chain body by means of a chain guide disposed on a rigid backplate.
  • the cutting is carried out by moving either the chain cutter and sprockets towards the object or the object to the chain body.
  • the depth of cut is not limited by the thickness of the cutting device of the equipment.
  • the flaps each in the shape of a plain plate, are connected to each other for angular movement in the cutting plane to form the endless chain body, it is possible to obtain sufficient tension-resisting force by using the flaps of relatively thin thickness.
  • the thickness of each of the cutting devices can be reduced, thus, the cutting cost of the object can be reduced leading to improved yield.
  • the flaps are flexibly connected to each other, stress fatigue does not occur in the curved region of the chain cutter, and it is possible to use the chain cutter with a higher applied tension force than in conventional cutting devices. Accordingly, the cutting service life is longer than in the conventional cutting tools, and it is possible to enhance cutting efficiency.
  • the chain cutter is supported at the inner straight section of the chain by a support section of the rigid backplate, it is possible to support a high load required for large cutting bite.
  • the length of the chain body can be freely increased or decreased.
  • the object capable of being cut is not restricted in size or dimension.
  • the individual flaps are small in size and the same in configuration as each other. Accordingly, the flaps can be mass produced thereby reducing the cost of the entire chain cutter.
  • the flatness and surface roughness of the cut surface are superior, and no one-sided wear occurs on the cutting devices.
  • the service efficiency of the cutting devices is high.
  • the chain cutter is in the shape of a chain, and is relatively light in weight, handling and transportation or the like are easy. Vibration due to cutting is attenuated at the connecting sections between the flaps. Thus, it is possible to reduce the noises as compared with other cutting tools.
  • Figure 1 is a front view and Figure 2 is a plan view with a partial cut-away of the column section of a cutting apparatus for according to a first embodiment of the invention.
  • C represents a chain of cutters (hereinafter referred to as the chain cutter) and is a primary component of the cutting apparatus. The details of this component will be explained in the following.
  • the chain cutter C is comprising an endless chain body 2 in which a plurality of flaps 1, each in the shape of a plain or flat plate, is connected to each other, as shown in Fig. 3, to provide a flexible angular movement within a cutting plane (hereinafter the cutting plane is defined by the path of the chain cutter).
  • a plurality of abrasive-grain segments or cutting device 4 is firmly mounted to the outer ends of the respective flaps 1.
  • Each flap 1 is in the shape of a rectangular plate having a constant thickness, and is made of metal such as SK steel, stainless steel, SKD steel, SUP steel, SNCM steel or the like. It is desirable that the hardness of the flap 1 is brought to HRc 30 to 65 by hardening treatment or the like. If the hardness of the flap 1 is less than HRc 30, it is impossible to obtain a sufficient strength, while, if the hardness is higher than HRc 65, forming of the flap 1 becomes difficult.
  • the dimension or size of the flap 1 varies depending upon the use of the chain cutter. In a case where the flap is utilized in cutting of normal large stone, for example, it is preferable that the flap 1 has its thickness of the order of 2 mm to 6 mm, its height H of the order of 50 mm to 150 mm, and its width W of the order of 40 mm to 100 mm. If the dimension of the flap 1 is within these ranges, it is possible to cut a large stone with high efficiency using sufficient tensioning force. In this connection, the invention is not limiting to these dimensions quoted.
  • each of the side face of the flaps 1 has a circular connecting tab 8, pointing in the direction of the rotation.
  • An circular connecting cut-out 10 is formed at an opposite side face of the flap 1, in the rear direction (or the rear end), having substantially the same dimension as the connecting tab.
  • a line connecting a center 01 of the connecting tab 8 to a center 02 of the connecting cut-out 10 is set parallel to the outer and the inner peripheral ends of the flap 1.
  • the connecting tab 8 has its outer peripheral surface 8A whose cross-sectional shape is, as shown in Fig. 4, a V-shaped convex configuration along its entire periphery. It is preferable that the V-shaped configuration has a cross-sectional angle of the order of 60 o to 170 o . If the cross-sectional angle is less than 60 o , it is difficult to form the outer peripheral surface 8A, and the connecting strength is reduced, while, if the cross-­sectional angle is larger than 170 o , there is a chance that the flaps disengage in the thickness direction of the flap 1.
  • the peripheral surface of the connecting cut-out 10 has a tapered region 10A in a half section extending away from the center of the thickness of the flap 1 (in a direction away from the viewer) as shown in Fig. 5 (and further in Figs. 7, 10, 11 and 12).
  • the configuration of the tapered surface 10A is complementary in cross-sectional configuration with the connecting tab 8.
  • a portion of the peripheral surface of the connecting cut-out 10, which extends from the aforesaid thickness center to the front surface (towards the viewer) of the flap is given a designation 10B and is perpendicular to the front face.
  • the cross sectional shapes can be seen in Fig. 7.
  • the diameter of the cut-out 10B is only slightly larger than the maximum diameter of the connecting tab 8.
  • a staking (tightening) groove 12 is formed on the front surface of the flap 1, at a location slightly spaced away from the connecting cut-out 10.
  • the staking groove 12 has its opening width F of 1 mm to T mm, desirably, of 1 mm to 5 mm. If the opening width F is within this range, the staking operation will become easy in practice, and there is no fear of reduction of the holding strength at this portion.
  • the staking groove 12 (Figs. 10, 11 and 12) has a portion of its wall surface adjacent to the vertical wall 10B, tapered along the entire length. It is desirable that an angle G between the tapered surface and the vertical line of the groove is 10 o to 45 o If the angle is out of this range, the staking operation will become difficult. This angle G is larger than an angle L defined as the angle between the tapered surface 8A of the connecting tab 8 and the vertical line. If G is less than L, it is impossible to practice sufficient tightening.
  • the staking groove 12 has its depth 1 which is 30% to 60% of the flap thickness T and, more desirably, 30% to 50% thereof. If the depth I is less than 30%, engagement of the connecting tab 8 due to the staking will become difficult, while, if the depth I is larger than 60%, the holding strength will be reduced.
  • the reference character P denotes a punch which is used in staking operation and which is firmly mounted to an upper mold of a press machine (not shown).
  • the shape of the lower portion of the punch P is an curved configuration in cross-section to fit in the staking groove 12 along its entire length.
  • the outer peripheral surface side of the punch P is a vertical plane extending in parallel relation to the punch axis, while an inner peripheral surface side of the punch P is a tapered surface.
  • the length-wise cross sectional shape of the lower end of the punch P surface is curved, whose radius of curvature K is larger than that of the curvature J (refer to Fig. 13) of the inner bottom surface of the staking groove 12.
  • Joining of the flaps 1 is done as follows. That is, as shown in Fig. 11, the flap 1 is made to rest on a base B of the press machine with the staking groove 12 facing upward. The connecting tab 8 of another flap 1 is fitted into the connecting cut-out 10 from the side of the vertical peripheral wall 10B, and the lower end of the punch P is abutted against the staking groove 12. Then, a pressure is applied to the punch P by the press machine. By so doing, the punch P pushes and enlarges the staking groove 12, as shown in Fig. 12. Thus, a ring portion 14 is bent inwardly, so that the vertical peripheral surface 10B is abutted tightly against the tapered surface 8A.
  • the connecting tab 8 has a pair of constricted portions 8B, all of which are formed respectively into an curved configuration, neck, as shown in Fig. 5, in order to prevent stress concentration. Further, the connecting cut-out 10 has, at its opening, a pair of side portions 10C each of which is rounded into an curved configuration having its radius of curvature smaller than that of a corresponding the neck of portions 8B.
  • An angle beta between both ends of the connecting cut-out 10 is 60 o to 150 o , preferably, 90 o to 120 o . If the angle beta is greater than 150 o , an engaging force of the connecting tab 8 due to the connecting cut-out 10 is so small that the connecting strength is reduced. On the other hand, if the angle beta is smaller than 60 o , the width of each of the constricted portions 8B of the connecting tab 8 is so reduced that the strength at this portion is lowered.
  • a central angle alpha between the constricted portions 88 of the connecting tab 8 is smaller than the central angle beta so that the connecting tab 8 can be rotated within the connecting cut-out 10. Further, a distance L2 from the center 02 of the connecting cut-out 10 to the extension line of the flap end surface is smaller than a distance L1 from the center 01 (Fig. 5) of the connecting tab 8 to the flap end surface.
  • a life gaging mechanism for the flap 1 will next be described.
  • a shallow C-shaped life gaging groove 16 (Fig. 17) is formed at a midpoint of the peripheral edge of the connecting cut-out 10.
  • a distance from the center 02 (Fig. 5) of the connecting cut-out 10 to the bottom surface of the life gaging groove 16 is set slightly larger than the maximum radius of the connecting tab 8.
  • a slight gap is formed (Fig.13) between the life gaging groove 16 and the outer periphery of the connecting tab 8. If a quantity of the gap is measured by a thickness gage or the like, it is possible to estimate a quantity of wear of the connecting tab 8 and the connecting cut-out 10. Thus, the degree of wear will become a measure of operable life.
  • the position of the life gaging groove 16 is not limited to the midpoint of the connecting cut-out 10, but may be any position in the peripheral surface. In this connection, the life gaging groove 16 formed near the midpoint will provides good sensitivity to wear.
  • Figs. 14 and 15 show a thickness gage K which is used for measuring the degree of wear.
  • 44 denotes a handle
  • 45 designates a tapered portion in the shape of an elongated thin plate firmly mounted to one end of the handle.
  • the tapered portion 45 has its thickness which is smaller, at its forward end, than the aforesaid quantity of gap G, and which increases gradually toward the handle 44.
  • the tapered portion 45 has its front surface onto which graduations 46 are marked.
  • An elongated plate-like slide bar 47 is arranged along the graduations 46.
  • the slide bar 47 has its rear end inserted in a bore 48 formed in the handle 44. Furthermore, the slide bar 47 has its upper surface which is provided with a projection 49.
  • the tapered portion 45 of the thickness gage K is inserted perpendicularly through the life gaging groove 16.
  • the slide bar 47 is abutted against the flap 1 and is moved to the rear , so that the forward end of the slide bar 47 shows one of the graduations 46, which would indicate the quantity of wear.
  • the arrangement may be such as shown in Figs. 16 and 17, that a semi-circular recess 16A is formed in the peripheral surface of the connecting cut-out 10, and a semi-circular groove 16B in the peripheral surface of the corresponding connecting tab 8, to form the life gaging bore 16 by these grooves 16A and 16B.
  • the thickness gage K having the rod-­like tapered portion 45 as shown in Fig. 18 is used, and the tapered portion 45 is inserted into the jig inserting bore 16, to compare the insertion depth with graduations 46A and 46B.
  • the graduations 46A indicate the quantity of new gap of the flap 1, while the graduations 46B indicate the size of the gap at the limit of use.
  • each flap 1 on the outer end face of each flap 1 is formed a semi-circular segment-mounting recess 18 at an off-center location nearer to the forward direction.
  • the segment-mounting recess 18 has a V-groove cross-section along its entire length. It is preferable that a central angle gamma defined between both ends of the mounting recess 18 is 90 o through 170 o . Desirably, the central angle gamma is 120 o through 160 o .
  • central angle gamma is less than 90 o , mounting and demounting of the cutting device 4 will become difficult, while, if the central angle gamma is larger than 170 o , there is a fear that the cutting device 4 will fall off.
  • the jig inserting groove 20 has its radius A2 (Fig. 5) which is larger than the distance A1 from the center of the mounting recess 18 to the outer end of the flap 1. If the radius A2 is smaller than the distance A1, it is impossible to demount or remove the cutting device 4 by a mounting and demounting jig 32 to be described subsequently.
  • the position of the jig inserting groove 20 may be modified or altered to the bottom of the mounting recess as indicated by M in Fig. 5.
  • the mounting recess 18 is provided with a narrow slit 22, one end of whose opening is directed toward the outer periphery.
  • This end of the slit 22 has one end which opens to a portion of the mounting recess 18 near to the forward edge of the flap 1.
  • the slit 22 has at its terminal end a circular bore 24 for stress relieving.
  • a portion to the forward edge of the slit 22 is an elastic engaging part 26, a deflection of which in the forward direction enables mounting and demounting of the cutting device 4.
  • the cutting device 4 is composed of a metal chip support 28 having its thickness the same as that of the flap 1, and a rectangular cutting bits 30 firmly mounted to the outer end face of the chip support 28.
  • the cutting bits 30 has its thickness which is set to be 0.5 mm to 4 mm thicker than the chip support 28. If the excess thickness of the cutting bits 30 is less than 0.5 mm, a possibility exists that the chip support 28 and the flap 1 are in frictional contact with a cut surface of an object. On the other hand, if the excess thickness of the cutting bits 30 is larger than 4 mm, the cutting loss is high and the yield is reduced unnecessarily.
  • the cutting bit 30 has a metal-bonded abrasive layer containing particles of diamond, CBN or the like, and is firmly mounted to the chip support 28 by means such as soldering, unit sintering, laser welding, electron beam welding or the like.
  • the grain or particle size, the degree of concentration and the thickness of the abrasive grains should be determined according to the use of the chain cutter.
  • the chip support 28 is integrally formed with a semi-­disc projection 28A complementary in configuration with the mounting recess 18.
  • the semi-disc projection 28A has a convex V-shaped cross-sectional configuration.
  • the projection 28A is formed so that the projection 28A can be fitted in the segment-mounting recess 18 when the slit 22 is opened, and the projection 28A is firmly engaged in the segment-mounting recess 18 when the elastic engaging part 26 returns to its original position.
  • FIGs. 8 and 9 show the aforesaid mounting and demounting jig 32 which is in the shape of a letter T having a handle 34 and a shaft 36.
  • the shaft 36 has its forward end 36A which is formed into a semi-circle in cross-section identical in size with the jig inserting groove 20.
  • the forward end 36A is inserted in the said groove 20, and the handle 34 is rotated through 90 o , whereby the cutting device 4 is released from the engaging force of the elastic engaging part 26.
  • a torsion- or twist-preventing structure for the flap 1 will next be described. Both the forward and the rear end surfaces of the flap 1, as shown in Fig. 5, are made parallel to each other. On the forward end face of the flap 1 is formed a V-shaped cross-sectional engaging groove 38 extending perpendicularly to the vertical forward end face of the flap 1.
  • an engaging projection 40 having its cross-sectional configuration complementary to the aforesaid engaging groove 38 is formed on the opposite side to the foregoing projection 38 of the flap 1.
  • Each flap 1 has, on the forward and rear corners, a pair of driving recesses 6A and 6B.
  • driving recesses 6A and 6B are curved in configuration and are disposed respectively at forward and rear corners of the inner peripheral end of each flap 1.
  • Each of the driving recesses 6A and 6B has its central angle which is of the order of 90 o .
  • Each of the driving recesses 6A and 6B (Fig. 3) has its radius of curvature which is identical with a radius of each of pins 126 firmly mounted respectively to outer peripheries of respective sprockets 88 and 112 of a cutting apparatus subsequently to be described. Further, portions extending respectively from the recesses 6A and 6B to the inner end faces of the flap 1 are rounded.
  • a distance between centers of the respective driving recesses 6A and 6B is equal to a distance between the pins 126.
  • the driving recesses 6A and 6B of the adjacent respective flaps 1 produce an identical curved surface, and the pins 126 are so arranged as to fit in the curved surface without gap.
  • each flap 1 is formed with a sliding groove 42 having in a V-shaped cross-section, which extends along the entire length of the end face of the flap 1. It is desirable that the angle of the V shaped sliding groove 42 is in a range of 60 o to 160 o . If the V-angle is smaller than 60 o , there is a fear that cracks occur in the flap 1 due to a wedging action of the back plate 118, while, if the V-angle is larger than 160 o , the twist-preventing force due to the back plate 118 in the thickness direction is reduced.
  • Figs. 1 and 2 will next be utilized to describe the cutting apparatus which uses the above-described chain cutter.
  • the descriptions such as the upper, lower, left- and right-hand side used in the following description are in reference to the orientation of the cutting apparatus as shown in Fig. 1.
  • the reference numeral 50 in the figures denote a pair of columns spaced apart suitably to provide the main support to the cutting apparatus. As shown in Fig. 2, mounted respectively to these columns 50 are a pair of rectangular bases 54A (left-hand side) and 54B (right-­hand side) which permit vertical motions along the column 50, but the keys 52 extending through vertically along the column prevent the rotation of the bases about the column.
  • a top plate 56 is firmly mounted across the upper ends of the respective columns 50 horizontally.
  • An elevating motor 58 is mounted to the left-hand end of the top plate 56.
  • the motor 58 is so designed as to rotate a screw shaft 60 (Fig.2) arranged along the rear face of the left-hand column 50, through a gearbox (not shown).
  • An elevating element 62 firmly mounted to the rear face of the left-hand base 54A is mounted to the screw shaft 60.
  • a gearbox 64 (Fig. 1) is firmly mounted to the right-hand end of the top plate 56.
  • a rotor shaft 66 is laid across or extends between the gearbox 64 and the aforesaid gearbox, so that power of the motor 58 is transmitted also to the gearbox 64.
  • the gearbox 64 has its output shaft which is connected to a screw shaft 68 arranged along the rear face of the right-­hand column 50.
  • An elevating element 70 which is firmly mounted to the rear face of the right-hand base 54B, is mounted to the screw shaft 68. When the elevating motor 58 is operated, both the bases 54A and 54B are moved vertically while always maintaining the same relative height.
  • a disc section 74 and a round-shaped groove 72 On the front of the left-hand base 54A, is a disc section 74 and a round-shaped groove 72 whose centers are at the center of the front-face.
  • a tilting plate 76 is arranged along the front face of the disc section 74, and a pair of pawl sections 76A formed respectively at both sides of the tilting plate 76 are fitted respectively in both sides of the round-shaped groove 72.
  • the pawl sections 76A are rotated within the round-shaped groove 72, causing the tilting plate 76 to rotate coaxially with the disc section 74.
  • the tilting plate 76 has on its front face a rectangular guide rail 78 extending in the right- and left- hand direction.
  • the arrangement is as follows. That is, mounted to the guide rail 78 is an L-shaped support plate 80 having its right-hand end bent forwardly so that the L-shaped support plate 80 is movable in the left- and right-hand directions.
  • the support plate 80 is pulled with a constant force to the left by a biasing mechanism (not shown).
  • the front face of the tilting plate 76 has a center which is formed with a shaft section 82 projecting forwardly.
  • the shaft 82 projects forwardly through an elongated bore 84 which is formed in the support plate 80 and which extends in the left- and right-hand directions.
  • Mounted to the shaft 82 for rotation is a pulley 86 and a sprocket 88 which are connected to each other in a coaxially.
  • a drive motor 92 is mounted to the left-hand front side face of the base 54A through an attaching plate 90 adjustable in height.
  • a pulley 94 is firmly mounted to a rotary shaft of the drive motor 92.
  • a belt 96 passes around and extends between the pulley 94 and the aforesaid pulley 86. The tension force of the belt 96 is adjustable by vertically moving the attaching plate 90.
  • a pair of curved grooves 98 extending vertically and an circular segmental plate 100 having a uniform width.
  • the pair of curved grooves 98 and the circular segmental plate 100 share the same center of arc as the center of the left-hand sprocket 88.
  • a support plate 102 is arranged at the front face of the segment section 100.
  • the segment section 100 has its both sides which are formed with a pair of pawl sections 104 inserted respectively in the curved grooves 98.
  • the support plate 102 is capable of being inclined through an angle equal to or larger than 5 o about the center of the left-hand sprocket 88 along the section 100. If the tilting angle is less than 5 o , cutting into the object W will become difficult to start.
  • the support plate 102 has on its front face a slide-­rail 106 extending in the left- and right-hand direction or the lateral direction.
  • a pulley mounting plate 108 is attached to the slide-rail 106 for movement in the left-­and right-hand direction.
  • At the front center of the pulley mounting plate 108 is a shaft 110 which extends forwardly and coaxially.
  • a driving sprocket 112 is rotatably mounted to the shaft 110 through a bearing.
  • a hydraulic cylinder 114 is firmly mounted to the right-­hand end-face of the support plate 102 and is directed toward the left. The hydraulic cylinder 114 has its rod which is connected to the pulley mounting plate 108.
  • an operating panel 116 is firmly mounted to the right-hand end face of the right-hand base 54B, and each section is controlled by the operational panel 116.
  • the left-hand end of the support plate 102 is bent in the forward direction in the shape of a letter L.
  • a rectangular back plate 118 extends between the support plate 102 and the right-hand support plate 80 in a plane common to the sprockets 88 and 112.
  • the back plate 118 is made of a material such as SUP steel, SNCM steel, SKD steel, SK steel, stainless steel or the like.
  • the back plate 118 has its thickness which is the same as the flap 1.
  • the vertical distance of the back plate 118 is made equal to the winding diameter of the chain cutter C which is driven by the sprockets 88 and 112.
  • the upper and lower edges of the back plate 118, along its entire length, are formed respectively into a convex V-shaped cross-section complementary with the sliding groove 42 formed oh the inner peripheral end of the chain cutter C.
  • the chain cutter C extends between and is wound about the sprockets 88 and 112. In the linear section of the chain, the upper and lower edges of the back plate 118 are fitted, respectively, in the sliding grooves 42 and into the flaps 1 for sliding movement.
  • the sprockets 88 and 112 are made with a pair of discs 120 and 122 bonded together to form a slit 124.
  • the slit 124 has its opening width which is slightly larger than the thickness of the flap 1.
  • the plurality of cylindrical pins 126 is firmly mounted to the interior of the slit 124 at equal intervals in the peripheral direction. An occluded angle between the pair of adjacent pins 126 defines a sprocket angle S.
  • a shallow gutter 128 at a location between the columns 50, extending in the front and rear directions.
  • a pair of guide rails 130 is mounted at the center of the gutter 128 in parallel relation to each other.
  • a work platform 134 (hereinafter referred to as table 134) having its lower surface provided with two pairs of wheels 132 rests on the pair of guide rails 130.
  • a traction wire 136 connected to a drive machine (not shown) is connected to the longitudinal ends of the table 134, so that the table 134 is movable along the guide rails 130.
  • the elevating motor 58 is operated to move the bases 54A and 54B upwardly, and the object W such as stone or the like resting on the table 134 is positioned longitudinally, i.e. along the chain cutter C.
  • the support plate 102 is moved downward along the curved plate section 100, to tilt the entirety including the chain cutter C and the back plate 118.
  • the support plate 102 is fixed at this lowered position.
  • the left-hand support plate 80 is adjusted to apply an adequate tension to the back plate 118.
  • the hydraulic cylinder 114 is operated to pull the attaching plate 108 toward the right. In this manner, the tension force of the chain cutter C is set to an adequate value.
  • the drive motor 92 is operated.
  • the elevating motor 58 is operated while rotating the chain cutter C in the direction shown by the arrows in Fig. 1, to lower the entire chain cutter C at a predetermined cutting speed.
  • the chain cutter C is cut into the object W from the lowered right-hand corner. If a certain degree of cutting depth is reached in due course, the support plate 102 is raised along the curved plate 100, and the chain cutter C is returned to its horizontal position and is locked in place. Cutting proceeds further until the operation has been completed on the object W.
  • the recesses 6A and 6B were formed, respectively, at both sides of the inner face of the flap 1 as an engaging/driving components. They can be substituted with a semi-circular recess in the center area of the inner face of the flap 1. Moreover, the arrangement may be such that a projection is formed on the inner face of the flap 1 while a recess to mesh with the projection can be formed on suitable locations of the sprocket.
  • the cutting bit may be firmly mounted to the flap so as to be incapable of being demounted, by means such as brazing or the like.
  • the cutting bit may be firmly mounted by any suitable detachable means.
  • the sliding groove 42 for the backing plate 118 was formed in the flap 1.
  • the arrangement may be such that a projection is formed on the end face of the flap 1, while a sliding groove is formed on the end face of the backing plate 118.
  • the chain cutter is characterized in that, in place of having the driving recesses 6A and 6B in the inner face of the flap 1, a circular through bore 204 is formed at the center of the connecting tab 8 on each flap 1.
  • Each of the through bores 204 is placed so as not to reduce the strength of the connecting tab 8, and the diameter of this bore is set to a size so that a plurality of drive pins 206 formed on the outer periphery of the sprocket 200 (subsequently to be described) can easily get into and out therefrom, while the sprocket 200 is rotated.
  • the edge of the front surface of the through bore 204 is chamfered so that the drive pin 206 can enter the through bore smoothly from the front surface end of the flap 1.
  • Other constructions are the same as those of the first embodiment.
  • the above-described chain cutter is used as follows.
  • the chain cutter is wound on a pair of rotatable pulleys (not shown). Further, as shown in Fig. 20, a pair of drive sprockets 200 and 202 are provided which cooperate with each other to clamp there between the straight line section of the chain cutter
  • One of the pair of drive sprockets 200 has its outer peripheral surface to which the plurality of drive pins 206 are firmly mounted at the same intervals as the through bores 204 in the chain cutter C.
  • the outer peripheral surface of the other drive sprocket 202 is formed into a simple cylindrical surface.
  • Rotation of each of the sprockets 200 and 202 causes the drive pins 206 to be successively fitted in the through bores 204 to drive the flap 1 and thereby the chain cutter C to perform cutting operation.
  • the configuration of the through bore 204 can be modified into an elliptical bore, an elongated bore, a rectangular bore, or the like which extend in the longitudinal direction of the chain cutter C, to facilitate entering of the drive pin 206.
  • the through bore 204 is not limited in its position to the illustrated position, but may be formed in another location which does not affect the strength of the flap 1, as indicated by N in Fig. 19, for example.
  • Figs. 21 and 22 show a third embodiment of the invention.
  • the third embodiment is characterized in that the flaps 1 are connected to each other through a plurality of pins 210 for angular movement.
  • a connecting projection 212 On one side end of the flap 1 is formed a connecting projection 212 in the shape of a semi-circular tab, having half the thickness of the flap 1.
  • the connecting projection 212 is flush with the rear end of the flap 1.
  • a semi-­circular connecting recess 214 On the forward end of the flap 1 is formed a semi-­circular connecting recess 214 which is concentric with the connecting projection 212 and which has its depth equal to half the flap 1 thickness.
  • the connecting recess 214 has its diameter which is slightly larger than that of the connecting projection 212.
  • a circular pin bore 216 is formed at the centers of the respective connecting recess 214 and projection 212.
  • the pin bore 216 has, at its back face side, an opening edge which is chamfered.
  • connecting projection 218 On the rear end of the flap 1, there is a similar connecting projection 218 having the same configuration as that described previously.
  • a connecting recess 220 similar to that described above is formed on the back face side of the flap 1.
  • a pin bore 222 is formed at the centers of the respective connecting projection 218 and recess 220, and the entry surfaces of the bore are chamfered.
  • the line joining the centers of the respective connecting projections 212 and 218 of the same flap 1 is parallel to the inner end of the flap 1 and to the cutting surface of the cutting bit 30.
  • the connecting pins 210 are inserted through the pin bores 222 and 216 of the connecting projections 212 and 218. Both ends of the connecting pin 210 are collapsed and are made flush with the front and rear faces of the flap 1, whereby the connecting projections 212 and 218 are prevented from falling off.
  • the connecting pin 210 is made of material superior in wear resistance and strength such as SKD steel, SNCM steel, or the like.
  • a semi-circular segment mounting recess 224 is formed in the center of the outer end of the flap 1, and correspondingly, the configuration of the projection 28A of the bit support 28 is also modified.
  • a rectangular jig inserting bore 226 is formed at the central region of the slit 22 and, accompanied with this, the mounting and demounting jig 32 is also modified so that, as shown in Figs. 29 through 31, the tip end 36A of the shaft 36 is formed into a square cross sectional configuration complementary with the jig inserting bore 226.
  • dimension is set so that both of the side surfaces of the flaps 1 are abutted against each other in the straight section of the chain.
  • the side surface of the flap 1 is not formed with the twist-preventing engaging sections 38 and 40. This arrangement is also possible.
  • FIGs. 23 and 24 show a fourth embodiment of the invention.
  • This fourth embodiment is characterized in that a plurality of C-rings 230 are used to connect the flaps 1 to each other, thereby easily releasing the connection.
  • the flap 1 has its one side surface which is formed with a connecting projection 232 similar to the first embodiment. As shown in Fig. 24, however, the thickness of the connecting projection 232 is slightly thinner than that of the flap 1.
  • the flap 1 has its front surface side which is formed with a curved step portion 234 at a root of the connecting projection. Further, the outer peripheral surface of the connecting projection 232 is formed into a tapered surface 232A which is narrowed at the rear face side of the flap along the entire length.
  • the flap 1 has its other side face which is formed with a connecting cut-out 236 in which the connecting projection 232 is accommodated.
  • the connecting cut-out 236 has its inner peripheral surface which is formed into a tapered surface 236A which is complementary with the aforesaid tapered surface 232A.
  • the tapered surface 236A is formed with a ring groove 238 along the entire length.
  • the above-mentioned step 234 is also formed with an curved ring groove 240 which is contiguous to the aforesaid ring groove 238.
  • the connecting projection 232 is accommodated bin the connecting recess 236, and the C-ring 230 made of a metallic thin plate is accommodated in the aforementioned ring grooves 238 and 240.
  • the connecting projection 232 permits rotational movement but not the movement in the thickness direction.
  • a tip end of a tool is inserted into the holes in the C-ring 230, and the C-­ring 230 is squeezed and is removed from the ring grooves 238 and 240, thereby enabling connection between the flaps 1 to be released.
  • the following advantages are produced. That is, it is possible to easily replace the worn flap 1, or to easily alter the connecting number of the flaps 1 to modify the length of the chain.
  • the arrangement may be such that the connecting structure due to the C-ring 230 is applied only to a part of the flap 1, and the aforementioned other connecting structure is applied to the connection of the other flaps 1.
  • annular snap ring or the like can be used.
  • Figs. 25 through 27 show a part of a chain cutter for wood, according to a fifth embodiment of the invention.
  • a cutting-edge segment 250 is mounted to each of the flaps 1.
  • the flap 1 by itself may be made similar to that described in the previous embodiments.
  • the cutting-edge segment 250 is made of a material such as SK steel, SKH steel, SKD steel, cemented carbide or the like.
  • the cutting-edge segment 250 has its one end which is formed with saw cutting teeth 252 for wood.
  • the saw cutting teeth 252 are bent alternately in the thickness direction of the flap 1. Further, the other end of the cutting-edge segment 250 is integrally joined with a projection 250A similar to the case of the cutting device 4.
  • the chain cutter is mounted to the aforesaid cutting apparatus, and is used in cutting of large wood or the like by a method similar to that described previously. If the sharpness or quality of the cutting-edge segment 250 is degraded, the cutting-edge segment 250 can be replaced with new one by the use of the mounting and demounting jig 32 shown in Figs. 29 through 31, at the curved sections of the chain cutter.
  • Figs. 32 through 34 show a chain cutter for wood according to a sixth embodiment of the invention.
  • the sixth embodiment is characterized in that each saw tooth 262 of the cutting-edge segment 260 has a nose section 262A which is formed by a sintered body consisting of diamond, CBN or the like.
  • the service life of the cutting-edge segment 260 can considerably be lengthened more than the above-described chain cutter illustrated in Fig. 25, so that it is possible to reduce the replacement frequency of the cutting-edge segment 260 to raise the operational efficiency.
  • Fig. 35 shows an example in which the torsion preventing engaging sections 38 and 40 are omitted.
  • the configuration of the cutting-edge segment is not limited to the illustrated example, but the pitch, ion and configuration of the cutting edge may suitably be modified. Further, the arrangement may be such that the cutting-edge segments 250 and 260 are intermittently fixed to the flaps 1, in place of the fact that the cutting-edge segments 250 and 260 are fixed to all the flaps 1.
  • Fig. 36 shows a seventh embodiment which is characterized in that the peripheral surfaces of the connecting tab and the connecting cut-out 10 are formed perpendicular to the flap surface. Further, in the seventh embodiment, the depth of the sliding groove 42 for the back plate is formed deeper than that of each of the aforementioned embodiments.
  • the sliding groove 42 has its width which is of the order of 30% to 50% of the thickness of the flap from the viewpoint of strength. Furthermore, it is preferable that the sliding groove 42 has its depth which is of the order of 50% to 200% of the thickness of the flap 1, in order that the engaging force of the flap 1 in the thickness direction increases sufficiently.
  • the peripheral surfaces of the respective connecting cut-out 10 and tab 8 are configured as simple cylindrical surfaces, mere unfastening of the chain cutter from the back plate 118 and the sprockets 88 and 112 enables each flap 1 to be removed in the thickness direction. Accordingly, replacement of the worn-off flaps 1, alteration in the length of the chain body 2, and so on are practiced extremely easily and quickly.
  • peripheral surfaces of the respective connecting cut-out 10 and tab 8 are configured respectively as peripheral or circumferential surfaces, it is possible to form the flaps 1 with high accuracy by a relatively simple processing method. Thus, the manufacturing cost can be reduced.
  • Figs. 38 through 40 show a chain cutter according to an eighth embodiment of the invention.
  • the chain cutter comprises a plurality of flaps 1, in each of which a pair of outer plates 1A and 1C and an inner plate 1B formed by punching process or the like are bonded to each other in three layers by means of spot welding or the like.
  • the inner plate and the outer plates 1A and 1C have their respective configurations which are partially different from each other, thereby forming the engaging projection 40 and the sliding groove 42 for the back plate, as well as the groove 18A in the segment mounting recess 18, which has a C-shaped cross-sectional configuration.
  • the engaging groove 38 and the engaging Projection 40 are engaged with each other against movement in the thickness direction in the case where the connecting angle between the adjacent flaps 1 is equal to or less than the sprocket angle S.
  • the connecting angle. is made slightly larger than the sprocket angle 5
  • the engaging groove 38 and the engaging projection 40 are disengaged from each other.
  • the respective configurations of the mounting recess 18 and the mounting projection 28A of the cutting device 4 are modified respectively into elliptical configurations elongated in the connecting direction of the flaps 1.
  • the flap 1 is made in a three-layer construction, mere punching process and spot welding of the thin plates enable the sliding groove 42, the engaging groove 38, the engaging projection 42 and the groove 18A to be formed easily and at high precision. Thus, it is possible to reduce the processing cost as compared with the construction in which they are formed by grinding processing. Further, since the depths of the respective grooves 38 and 42 and the quantity of projection of the engaging projection 40 are made large, it is possible to raise the torsion preventing effects of the flaps 1 correspondingly.
  • the chain cutter C is loosened, and a part of the chain cutter C is bent more than the sprocket angle S. doing so, the engaging groove 38 and the engaging projection 40 are disengaged from each other, so that it is possible to freely remove the flap 1.
  • Figs. 41 and 42 show a ninth embodiment which is characterized in that the connecting tab 8 and the connecting cut-out 10 between each pair of adjacent flaps 1 are formed respectively into a semi-circular configuration.
  • the connecting tab 8 has its peripheral surfaces 8A and 8B at both side edges thereof which are identical in arc with each other. As shown in Fig. 43, the central angle alpha between the peripheral surfaces 8A and 8B is set equal to or larger than 120 o . If the central angle alpha is less than 120 o , the connecting strength between the flaps 1 is reduced.
  • the connecting recess 10 has a pair of peripheral surfaces 10A and 10B which corresponds respectively to the aforesaid peripheral surfaces 8A and 8B.
  • the central angle beta between a pair of opening ends 10C of the connecting cut-out 10 is formed larger than the central angle beta between the pair of constricted sections 8C of the connecting tab 8.
  • the connecting tab 8 and the connecting cut-out 10 are made in a semi-circular configuration, the quantity of projection of the connecting tab 8 and the depth of the connecting cut-out 10 can remain small, even if the size of the parts is increased. Accordingly, it is possible to decrease the width of the flap 1 in the connecting direction, and the strength of the connecting cut-out 10 can be raised to improve the connecting strength, to counter the reduction in depth of the connecting cut-out 10.
  • Fig. 45 shows a modification of the above-described ninth embodiment, in which each of the flap 1 and the chip support 28 is formed into a three-layer construction.
  • Figs. 46 and 47 show a tenth embodiment of the invention, which is characterized in that a mounting recess 300 and the slit 22 are formed in the bit support 28 of the cutting device 4, while a mounting projection 304 is formed on the flap 1.
  • an engaging groove 306 is formed in the end face of the straight line section of the connecting tab 8.
  • An engaging projection 308 is formed in the end face of the connecting cut-out 10 which corresponds to the engaging groove 306.
  • the engaging projection 308 and the engaging groove 306 of each adjacent flaps 1 are engaged with each other.
  • torsion of the flaps 1 in the thickness direction is further prevented.
  • the arrangement is also possible in which the engaging projection 38 and the engaging 40 for prevention of torsion are omitted.
  • the flap 1 can be brought to a three-layer construction, as shown in Fig. 48.
  • Figs. 49 and 50 show an eleventh embodiment of the invention.
  • the eleventh embodiment is characterized as follows. That is, a pair of projections 310 and a pair of grooves 312 in the shape of a V-shaped cross-­section, complementary with each other, are formed in the respective peripheral surfaces 8A, 8B, 10A and 10B of the connecting tab 8 and the connecting cut-out 10.
  • the projection 310 and the groove 312 are fitted in each other for sliding movement, but against movement in the thickness direction of the flap 1.
  • An angular-movement angle theta (Fig. 49) of the connecting tab 8 within the connecting cut-out 10 is larger than the sprocket angle S when the flaps 1 are arranged in a straight line manner.
  • An pension line of the end face 10D of the connecting cut-out 10 on the inner peripheral end thereof is set to be in contact with the end face 10C of the connecting cut-out 10 on the outer peripheral end thereof.
  • the mounting projection 28A of the bit support 28 and the mounting recess 18 in the flap 1 have their respective configurations each of which is formed into a shape in which a pair of arcs are connected to each other by a straight line.
  • the shape has such an advantage that the mounting recess 18 can easily be processed by an end mill.
  • the flaps 1 are prevented from separation in the thickness direction by engagement between the projection 310 and the groove 312, the flaps 1 are difficult to be separated from each other during cutting or transportation of the apparatus.
  • the flap 1 can be brought to a three-layer construction as shown in Figs 51.
  • Figs. 53 and 54 show a twelfth embodiment of the invention.
  • the arrangement is such that, as shown in Fig. 53, the size of the projection L of the connecting tab 8 does not reach the center 01.
  • Each of the curved peripheral surfaces 8A and 8B is formed with a projection 160, and each of the pair of curved peripheral surfaces 10A and 10B of the connecting cut-out 10 is formed with a groove 312 only at a portion having a predetermined length from the opening edge.
  • shortening of the connecting length of the flaps 1 enables the projection 310 and the 312 to be disengaged from each other, making it possible to separate the flaps 1 from each other in the thickness direction.
  • the flaps 1 are not disconnected from each other regardless of the connecting angle between the flaps 1, during such a period that tension is applied to the flaps 1.
  • the flap 1 may be formed into a three-layer construction, as shown in Fig. 55.
  • the connecting tab 8 has its forward end face which is set to the rear of the curved center 01, it is also possible that the forward end face is set forwardly of the center 01. In this case, the depth of the connecting cut-out 10 should be enlarged, and a room should be forced in which the connecting tab 8 can be moved forwardly within the connecting cut-out 10.
  • Figs. 57 and 58 show a thirteenth embodiment of the invention.
  • the peripheral surfaces 10A and 10B of the connecting cut-out 10 are so that only portions from the thickness center of the flap 1 toward the rear face thereof are made into tapered surfaces 314, while portions from the thickness center toward the front face are made respectively into vertical surfaces 316.
  • the front face of the flap 1 is formed with a pair of curved staking grooves 318 at their respective remote locations through a predetermined distance from the vertical surface of the connecting cut-out 10.
  • each of the pair of staking grooves 318 is enlarged along the entire length, and a pair of projecting sections 320 on the insides of the respective staking grooves 318 are deformed inwardly, whereby the connecting tab 8 is supported by the connecting cut-out 10 for angular movement, but against separation in the thickness direction of the flap 1.
  • the connecting tab 8 can not be removed from the connecting cut-out 10, so long as the projection 320 is not deformed.
  • the thirteenth embodiment is suitable in the case where it is not desirable to have the connection between the flaps 1 loose during handling.
  • Figs. 59 and 60 show a fourteenth embodiment of the invention, which is characterized in that the curved peripheral surfaces 8A and 8B of the connecting tab 8 and the curved peripheral surfaces 10A and 10B of the connecting cut-out 10 are formed respectively into spherical surfaces which are complementary with each other.
  • the engaging groove 40 and the engaging projection 38 of the adjacent flaps 1 are disengaged from each other, and the flap 1 is twisted as shown in Fig. 60, whereby the connecting tab 8 can easily be disengaged from the connecting cut-out 10. Accordingly, replacement of the flaps 1 and adjustment in the length of the chain can easily be done.
  • Figure 61 shows a fifteenth embodiment of the invention concerning the cutting apparatus.
  • both the upper and the lower edges of the back plate 118 was in contact with the upper and the inner peripheries of the cutter C.
  • only the lower edge of the backplate is in contact with the lower peripheral region of the cutter C in the linear section.
  • the vertical distance between the upper and the lower edges of the backplate 118 is smaller than the winding diameter of the chain cutter, and the lower edge of the backplate is equipped with a protrusion 118A, which is inserted into the sliding groove 42.
  • Other mechanisms remain the same as in Figure 1.
  • Fig. 62 shows a sixteenth embodiment of this invention.
  • the components which are the same as in Fig. 1 are not explained further in this section.
  • This embodiment is characterized in that there are four sprockets in stead of two.
  • the additional sprockets 400 and 402 are disposed in the same vertical plane as the plane joining the sprockets 88 and 112.
  • the left-hand shaft 50 has a movable base 404A which is separated some distance from the base 54A, and which can move freely vertically on the shaft 50. From the base 404A projects a shaft section 406A, upon which shaft is disposed a freely rotatable sprocket 400.
  • the right-hand shaft 50 has a movable base 404B which is separated some distance from the base 54B, and which can move freely vertically on the shaft 50. From the base 54B projects a shaft 406B, upon which shaft is disposed a freely rotatable sprocket 402.
  • the distance between the bases 54A and 404A is fixed and maintained by a spacer rod 408, and the pair of bases 54A and 404A moves vertically along the shaft while maintaining the constant separation.
  • the separation distance is adjustable with a hydraulic pressure from a hydraulic pump 410, which is located between the bases 54B and 404B.
  • the other components such as the backplate 118 locate between the bases 54A and 54B, and the support plate 80 are the same as in Fig. 1.
  • the chain cutter arrangement shown in Fig. 62 enables cutting of objects of varying sizes without changing the sprockets. This is important since changing the sprocket diameter changes the relative fit of the bit groove with the sprocket teeth, and consequently, a new sprocket requires a new flap.
  • the versatility of this chain cutter permits a cost efficient operation.
  • Fig. 63 shows a seventeenth preferred embodiment, in which the cutters are arranged in plurality.
  • four cutters are arranged in a multi-­sprockets configuration effected by stacking several plates 88A-88E forming a cylindrical rod extending in the axial direction.
  • Fig. 64 is an eighteenth preferred embodiment of this invention, characterized in that a provision, a pair of protrusions 500 protruding perpendicularly to the thickness direction, is made on the rear area of the backplate 118.
  • the thickness T1 of the protrusion 500 is two times the thickness of the cutting device 4.
  • the tapered protrusion extends along the back plate towards the center of the backplate 118 continuously and smoothly.
  • the protrusion when the cutting depth into the object W is deeper than the radius of the chain cutter C, the protrusion performs the function of separating the two cut surfaces so that the upper cutting edges will not interference with said surfaces.
  • the protrusion 500 is designed to prevent the bottom edge 30a of the cutting device 4 will not interfere with the edge W1 of the cut surface of the work piece W to cause breakage of the work piece or of the bits 30.
  • the protrusion 500 it is not necessary to have the protrusion 500 extending continuously along the backplate 118, it can be disposed periodically along a suitable path.
  • Fig. 65 shows a variation of the protrusion 500 on the backplate 118.
  • the protrusions are made alternately on each side surface of the backplate 118.
  • Such protrusions 500 can be made easily from simple plate shape materials. In comparison with the shape of the protrusion shown Fig. 64, this shape is able to lessen the impact shock, because the latter shape is more elastic than the former.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Sawing (AREA)
EP90118185A 1989-09-22 1990-09-21 Appareil à couper Expired - Lifetime EP0418915B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94109553A EP0623437B1 (fr) 1989-09-22 1990-09-21 Appareil à couper

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP247674/89 1989-09-22
JP1247674A JP2701478B2 (ja) 1989-09-22 1989-09-22 チェーンカッタ
JP276893/89 1989-10-24
JP27689389 1989-10-24
JP29883589A JPH03161215A (ja) 1989-11-17 1989-11-17 平板状チェーン体およびその駆動構造
JP298835/89 1989-11-17
JP1322237A JP2727711B2 (ja) 1989-12-12 1989-12-12 平板状チェーン体
JP322237/89 1989-12-12
JP12256290A JPH03205111A (ja) 1989-10-24 1990-05-11 切断装置
JP122562/90 1990-05-11

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP94109553A Division EP0623437B1 (fr) 1989-09-22 1990-09-21 Appareil à couper
EP94109553.1 Division-Into 1990-09-21

Publications (3)

Publication Number Publication Date
EP0418915A2 true EP0418915A2 (fr) 1991-03-27
EP0418915A3 EP0418915A3 (en) 1991-09-25
EP0418915B1 EP0418915B1 (fr) 1994-12-28

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EP90118185A Expired - Lifetime EP0418915B1 (fr) 1989-09-22 1990-09-21 Appareil à couper
EP94109553A Expired - Lifetime EP0623437B1 (fr) 1989-09-22 1990-09-21 Appareil à couper

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Application Number Title Priority Date Filing Date
EP94109553A Expired - Lifetime EP0623437B1 (fr) 1989-09-22 1990-09-21 Appareil à couper

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EP (2) EP0418915B1 (fr)
KR (1) KR910005983A (fr)
DE (2) DE69033884T2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999055506A1 (fr) * 1998-04-24 1999-11-04 Umberto Ferri Appareil a tailler la pierre utilisant un cable dentele portant des elements de coupe en forme de chaines
CN107310049A (zh) * 2017-07-07 2017-11-03 厦门致力金刚石科技股份有限公司 一种金刚石链锯及成型方法
CN112518898A (zh) * 2020-12-16 2021-03-19 南京清居楼科技有限公司 一种可灵活调整木板切割宽度的切割机
CN115476442A (zh) * 2022-09-20 2022-12-16 福建省华隆机械有限公司 一种厚度可调多锯条石板切割机
CN115519051A (zh) * 2022-10-12 2022-12-27 江苏南瑞银龙电缆有限公司 一种手持式线缆切割装置
CN118123313A (zh) * 2024-05-10 2024-06-04 成都工业学院 一种管道焊接机器人及其焊接方法

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PT1332822E (pt) * 2002-01-16 2007-11-16 Swarovski Tyrolit Schleif Serra de fita

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US1178362A (en) * 1915-05-07 1916-04-04 Rode Nicolay Wall Saw.
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WO1999055506A1 (fr) * 1998-04-24 1999-11-04 Umberto Ferri Appareil a tailler la pierre utilisant un cable dentele portant des elements de coupe en forme de chaines
CN107310049A (zh) * 2017-07-07 2017-11-03 厦门致力金刚石科技股份有限公司 一种金刚石链锯及成型方法
CN112518898A (zh) * 2020-12-16 2021-03-19 南京清居楼科技有限公司 一种可灵活调整木板切割宽度的切割机
CN115476442A (zh) * 2022-09-20 2022-12-16 福建省华隆机械有限公司 一种厚度可调多锯条石板切割机
CN115519051A (zh) * 2022-10-12 2022-12-27 江苏南瑞银龙电缆有限公司 一种手持式线缆切割装置
CN115519051B (zh) * 2022-10-12 2023-10-13 江苏南瑞银龙电缆有限公司 一种手持式线缆切割装置
CN118123313A (zh) * 2024-05-10 2024-06-04 成都工业学院 一种管道焊接机器人及其焊接方法

Also Published As

Publication number Publication date
EP0418915B1 (fr) 1994-12-28
EP0623437A3 (fr) 1995-11-15
DE69033884D1 (de) 2002-01-31
DE69015532D1 (de) 1995-02-09
DE69033884T2 (de) 2002-07-18
EP0418915A3 (en) 1991-09-25
KR910005983A (ko) 1991-04-27
EP0623437A2 (fr) 1994-11-09
EP0623437B1 (fr) 2001-12-19
DE69015532T2 (de) 1995-06-08

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