NZ286540A - Cutting apparatus; details of mechanism for cutting a pattern in material - Google Patents

Description

Pat. 5 Form No. 5 NEW ZEALAND 28 6540 'P,l0% "*• Compter So«f/«rtoti ^ w F"M: a-:S~^ p"Wlc«tton Date;.?.jjj[.MAY 199? P °- J<Xirn>| No: ....flLfa (a) Insert title of Invention. (b) State (in full) name, address and nationality of applicant or applicants as in application form (c) Here begin full des-kcription of invention. The Y continuation of the specification should be upon paper of the same site as this form, on one side only with the lines well spaced and with a margin of 2.5cm on the left hand side of the paper. The completion of the description should be followed by the words "What I (or we) claim is" after which should be written the claim or claims numbered consecutively (see note below). The specification and the dup-licate thereof must be signed at the end.

PATENTS ACT 1953 COMPLETE SPECIFICATION (To be furnished in Duplicate) (a) -TkrtQNg/l Where priority as provided by subsection (2) or (3) of section 11 of the Patents Act 1953 is desired in respect of one or more provisional specifications, quote number or numbers and date or dates No.

Date. -razs. 4 Ct-rr&vG- nzi/xce Pad Cttr-rxA/e. jr,y HES POMYq Y/fr* /k-rzoA/ a* & 6ctTrjz*/4-i&i (h) "fthvtAS T 3.3/? . ?£<A.US 96c*o P Mfirfxertn-uTjry ; Jg>ttrtt A-FAntAA/.

HEREBY declare the invention, for which 1/we pray that a patent may be granted to me/us and the method by which it is to be performed, to be particularly described in and by the following statement: Ttfg SSgtre-XC -TM£ J^/^rr^A/ (C) <t> A -f/ZAicfijfa . 7J.jM/ZAt-FroA/ (c*/-T&</ct eg .oyV /9- -TTrKl NOTE. The claims must relate to a single invention, must be clear and succinct, and must be fairly based on the matter disclosed in the specification. They should form in brief a clear statement of that which constitutes the invention. Applicants should be careful that their claims include neither more nor less than they desire to protect by their patent. Any unnecessary multiplicity of claims or prolixity of language should be avoided.

Claims should not be made for the efficiency or advantages of the invention. 28 m 0 * < The following statement is a full description of this invention including the best method of performing known to me . I shall first give the background to the invention and there after the summary of the invention as set out in attached pages 2 through to page 8.

Background To The Invention The specific field of the invention relates to a tenoner. The invention is however, not limited to the working of wood only or the cutting of only mortice and tenon joints.

The only device known to the applicant also achieving the preparation of the kind of joint prepared with the device of this invention has a control arrangement operating in an automatic fashion. It is not manually operable while being a complicated piece of machinery not suitable for the individual wood working enthusiast or even small workshops.

Summary Of The Invention.

According to the invention there is provided a cutting device for cutting material in response to the action of a cutting bit comprising : a conventionally powered rotary motor cutter facility of the kind performing its main cutting action in response to lateral displacement relative to the cutting axis of the cutter facility between it and the material being cut; a holding arrangement for holding material intended to be cut in a cutting relationship with respect to the cutter facility, and a manually manipulable displacement arrangement coacting with at least one of the cutter facility and the holding arrangement for causing the cutter facility and the holding arrangement for causing the cutter facility to describe at least one pattern of pre-determined shape comprising at least a smooth curve, in response to relative movement between the cutter facility and the holding arrangement as brought about by the manual operation of an appropriate, and at least smooth curve singular action, cutting pattern describing mechanism, involving displacement according to a specific stop layout, at least in the case where the cutting pattern describing mechanism performing the singular cutting action does not describe a pattern extending closed loop, to enable at least one of the repetitive performance of the pattern described by the cutting pattern describing mechanism and, in the appropriate case, and with the cutting pattern describing mechanism being arranged to perform a plurality of cutting actions, the formation of a complementary cutting pattern male - female fashion mateable with the cutting pattern which it complements owing to involving at least one of the cutting actions, the stop layout, in the case of the mechanism providing a cutting pattern involving a plurality of cutting actions, providing the various stop positions for each of the cutting actions with the pattern, as being formed continuously as result of the operation of the cutting pattern describing mechanism, being achieved when all but one of the sub-mechanisms constituting the cutting pattern describing mechanism being situated in the appropriate one of its stop positions while manually causing the sub-mechanism not so positioned to be displaced between its stop positions, and selecting the appropriate next one of the sub-mechanisms once a cutting action is being performed has reached its stop position, until the desired pattern is achieved.

The displacement arrangement may coact with the cutter facility with the holding arrangement thus remaining stationary when the device is used to perform its cutting function.

The cutting pattern describing mechanism may be arranged to describe a smooth curve cutting action in the form of at least an arcuate part of a circle, if not the full circle, owing to the cutter facility being mounted to be swivelled about an axis parallel to and spaced from its cutting axis.

The cutting pattern describing mechanism may be arranged to also perform a linear motion cutting action owing to including a rotary motion cutter linearly displaceable cutting pattern describing sub-mechanism constrained to move between a plurality of stop positions comprising at least two end stop positions, in addition to at least partly circular cutting pattern describing mechanism as also forming a sub-mechanism, a pattern including at least one linear part and one arcuate part thus being performable by means of the device.

The at least partly circular cutting pattern describing sub-mechanism may be arranged to perform a full circle constituted by two semi-circular cutting actions with the cutting pattern describing mechanism being arranged to cut a pattern at least a linear part having a semicircular part extending tangential to each end of the linear part.

The cutting pattern may preferably be constituted by two parallel linear parts bridged by semi-circular end parts thus extending oblong closed loop fashion, to the pattern being constituted by two parallel linear cutting / Page3 28 6540 actions separated by the diameter of the semi-circular actions from another as formed by using the linearly displaceable and semi-circle cutting pattern describing sub-mechanisms, changing from a linear cutting action to a semi-circular cutting action involving changing from the linearly displaceable sub-mechanism to the arcuately displaceable sub mechanism and vice versa with the one cutting pattern describing sub-mechanism being maintained in the appropriate one of its stop positions while the other one is caused to move between its end stop positions.

The linearly displaceable sub-mechanism may include a slide member mounted to slide along the at least one slot of a slot providing arrangement between stop positions in response to its manual urging in the desired direction, and from which the rotary motion cutting facility extends with its axis of rotation being transverse to the sliding direction of the slide member.

The linearly displaceable cutting pattern describing sub-mechanism may include an arm manually to and fro movable fashion interacting with the slide member for its appropriate displacement.

The end positions of the slide member along its path may conveniently be provided by fixed notches appropriately spaced and engageable by a manually operable clip being in conjunction with the arm and biassed to engage with a notch, the clip thus being manually disengaged from the one end position providing notch on commencing linear movement of the slide member while engaging with the other notch once the full linear path has been traversed.

In an embodiment the cutting device may include a replaceable notch providing member to template fashion cater for a variety of slide member linear path lengths.

The semi-circular cutting pattern describing sub-mechanism, as causing the swivelling of the cutter facility about an axis resulting in tangential joining between the linear motion and the semi-circular cutting actions, may include a manually swivellable cutter facility mounting member mounted to be swivelled about an axis coinciding with the axis and located at the leading end of the slide member and to which the cutter facility is desirably off center with respect to the swivelling axis of the mounting member mounted.

The cutter facility mounting member may be fixed to the slide member which is shaft fashion mounted to swivel, in addition to being slid to and fro, with an at least one arcuate movement stop formation, as being 2865*4 0 displaceable in conjunction with the slide member, performing its function by being in such a way arcuately displaceable between two stop positions as not to interfere with the sliding movement of the linear sliding formation sub-mechanism when either of its stop positions and vice versa.

The stop positions of the semi-circular cutting pattern describing sub-mechanism, as forming part of the cutting device stop layout, may be provided by at least one stop formation as located off center with respect to the axis of and remote from the position of the cutter facility mounting member to the slide member while being swivellable in conjunction with the slide member and being biassed, while manually retractable, to engage firmly but displaceable along the at least one slot of the slot providing arrangement along which the slide member is slideable, the stop formation being positioned at an arcuate distance a quarter turn spaced from the position of the cutter facility with respect to the axis of the slide member resulting in engagement of the stop formation with the slot, as providing the stop positions of the semi-circular cutting pattern describing sub-mechanism as being half a circle spaced from one another, when the cutter facility is tangential to a linear displacement action of the linear displacement cutting describing mechanism.

The semi-circular cutting pattern describing sub-mechanism may preferably include two arcuate movement stop formations diametrically opposing one another with respect to the axis of the slide member thereby promoting a firm maintenance of the semi-circular cutting pattern describing sub-mechanism in either of its end positions, swivelling of the semi-circular cutting pattern performing sub-mechanism being able to be commenced with once the stop formations are caused to be manually retraced from the slot with which they engage when the semi-circular cutting pattern describing sub-mechanism is an end position via a manually operable retracting arrangement.

The retracting mechanism may be provided by a lever mounted to urge against a arcuate movement stop formation connecting piece when manually put under force thereby retracting the formations from the slot.

The cutting device may also include an adjustment mechanism for adjusting the spacing between the axis of the cutter facility and the and the axis of the linearly displaceable member by enabling a change of the radius at which the cutter facility is positioned in response to radial displacement of the cutter facility along its mounting member.

• The slot providing arrangement may be provided by a pair of slot defining members defining aligned parallel slots along which the slide member is slidably mounted with the arm being displaceable between the slot defining members intermediate the two end positions of the slide member.

In a preferred embodiment the linearly displaceable member may be mounted along slide blocks fitting firmly but smoothly displaceable along the at least one slot of the slot arrangement to promote achieving identical successive patterns.

The rotary motion cutter may conveniently be driven via a drive mechanism comprising a remotely mounted motor drivably connected to the cutter via a drive belt running along a drive pulley mounted on a extension of the shaft of the pulley, the mechanism including a jockey pulley to accommodate for the variation in distance between the motor and the drive pulley in response to variation in the distance between the cutter and the motor on displacement of the cutter owing to performance of its cutting action(s).

The cutter facility may provide for chuck fashion replacement of a cutting The holding arrangement may provide for adjusting the position of a piece of material desired to be cut horizontally and vertically laterally with respect to the cutting axis of the cutter as well as in its cutting direction while being firmly held while including a stop facility for limiting travel in the cutting direction thereby determining the depth of a cutting action into material so firmly held.

The holding arrangement may provide for adjusting the position of a piece of material desired to be cut horizontally and vertically laterally with respect to the cutting axis of the cutter as well as in its cutting direction while being firmly held while including a slop facility for limiting travel in the cutting direction thereby determining the depth of a cutting action into material so firmly held.

The holding P-xrangement may also include a calibrating arrangement for precalibrating its position relative to the cutter device for facilitating the cutting of male/female engaging patterns in different pieces of material desired to be joined. bit.

Page6 28 654 0 BRIEF DESCRIPTION OF THE DRAWINGS The invention is now described, by way of example, with reference to the accompanying drawings. In the drawings Figure 1 shows a cutting device according to the invention in the form of a tenoner, in three dimensional view, Figure 2 shows the cutter facility and part of the displacement arrangement of the tenoner in cut away side elevation, Figure 3 shows the cutter facility of the tenoner as viewed end on from the side of the cutting bit, and Figure 4 shows the holding arrangement by means of which wood material desired to be cut is held, in exploded view.

Figure 5 shows in detail the linearly displacing mechanism serving as linearly displaceable arrangement for performing a straight line cut in the process of forming a tenon.

DETAILED DESCRIPTION OF THE DRAWINGS Referring the drawings a cutting device, according to the invention, in the form of a tenoner, is generally indicated by reference numeral 10.

The tenoner 10 comprises a cutter facility 12 as provided by a conventional chuck 14 replaceably holding a wood cutting bit 16, a holding arrangement generally indicated by reference numeral 18 for operatively holding a piece of wood desired to be worked on, and a manually manipulable displacement arrangement by means of which the cutter facility 12 is caused to describe an oblong cutting pattern of pre-set dimensions by means of the performance of a combination of linear and arcuate, as in the form of semi-circular, cutting actions which thus includes the possibility of also performing a simple linear cutting action, in response to manual manipulation of a cutting pattern describing mechanism 20 as mounted to a support frame 22. The cutter facility 12 and the mechanism 20 are mounted to a mounting box 23.

The cutting pattern describing mechanism 20 is a combination of a linearly displaceable cutting pattern sub-mechanism 24 and a semi-circular cutting pattern describing sub-mechanism 26 which interact, as is discussed here after, to cut an oblong pattern. 3 28 6540 The linearly displaceable sub-mechanism 24 is constituted by a slide member in the form of a shaft 28 mounted to slide laterally to its axis 30 along a slot providing arrangement as providing two aligned slots 32, and an arm 34 by means of which the shaft 28 is to and fro linearly displaceable. The shaft 28 passes along an aperture in a bush 35 provided along the arm 34. To promote a sliding action with negligible lateral play in the slots 32 the shaft 28 passes through the aperture of a slide piece having linear slot engaging edges via which it lies along a distance.^gainst the oppositegides of the slot 32 remote from the cutter facility^ 2 9not shown in detailOjvhile the opposite sides of the bush 35, as passing along the other slot~3^ are likewise formed.

As the pattern is pre-set to fixed dimensions, the length of the linear displacement action of the sub-mechanism 24 is limited to extend between two end positions as forming part of a stop layout of the mechanism 20. The end positions are provided by notches 38 which are each engageable by a clip 40 biassed to so engage and operably by means of a lever mechanism 42 of which manual depressing of the button 44 results in disengagement of the clip 40 from a notch 38. When linear displacement of the shaft 28 which manipulates the cutter facility 12 is thus desired with the sub-mechanism 24 locked in an end position, the clip 40 is simply disengaged from the relevant notch 38 by means of the mechanism 42 and the shaft 28 caused to be slid in response to manually exerting a force on the arm 34 in the appropriate direction. The end of this sliding displacement is reached once the clip 40 is caused to slip into the other notch 38.

To promote versatility of the device 10, the notches 38 are provided along a replaceable template 46. The opposite side of the template 46 also displays notches 38 of another sliding action path length.

For ease of operation and to eliminate its rise and fall, the arm 34 interacts lever fashion with the shaft 28 by means of an arm 47 swivelably engaging with both the one end of the arm 34 and the mounting frame 22 of the device 10.

The semi-circular cutting pattern describing sub-mechanism 26, to describe the semi-circular cutter device action as forming the ends of the oblong pattern, comprises a cutter facility mounting member as provided by a flange type mounting back plate 48 which is fixed to be swivelled about the axis 30 of the shaft 28, at its one end, and two arcuate movement stop formations in the form of plungers 50 off centre with respect to the axis 30 to a flange type base plate 52 axially fixed to the opposite end of the shaft 28. The plungers 50 are interconnected by a connecting piece 54 with which a lever arm 56 interacts to cause the plungers 50 to be retracted in the direction 58. The plungers 50 are biassed by being spring loaded to a slot engaging directiort^otshown in^detaiTQ opposite to the direction shown by arrow 58. As with the linear displacement sub-mechanisms 24, the sub-mechanism 26 is also mounted to be swiveled between end positions. This is achieved by the plungers 50 releasably engaging with the one slot 32. The sub-mechanism 26 is swivellable between two end positions spaced half a circle from one another as the plungers 50 at such locations engage with the slot 32. In addition to being linearly displaceable, the shaft 28 is thus also swivellable.

To cause the cutter facility 12 to execute a swivelling action about the axis 29 it is off-centre with respect to the axis 30 mounted to the back plate 48. Swivelling through a semi-circular arc is thus achieved by retracting the plungers 50 from the slot 32 by means of the arm 56 and turning the shaft 28 in a clockwise direction by also using the arm 56 until the plungers 50 again engage with the slot 32. As the cutter facility 12 must be able to cut a tenon, thus an oblong pattern, the cutter facility 12 is radialy adjustably mounted to the back plate 48. While specifically referring to figure 3, this is done by locating the cutter facility mounting flange 12.1 of the cutter facility 12 via tightenable screws 60 passing through slots 62 in this flange 12.1 against the back plate 48. Adjustment of the radial spacing of the cutting bit 16 from the axis 29 is thus achieved by releasing the scre ws 60, desirably sliding the cutter facility 12 by means of jack screws 12.2 and retightening the screws 60 To perform an oblong catting action by means of the mechanism 20, the radial Iine9s0 of the cutter facility 12 and the plungers 50 are spaced 90 degrees apart. This ensures that the semi-circular action of the sub-mechanism 26 joins tangentialy with the linear action of the sub-mechanism 24.

The cutter facility 12 is driven from a frame mounted motor 64 driving the facility 12 by means of a drive belt 66 running along pulleys 68. To accommodate the variation in distance between the pulleys 68 on operating the mechanism 20, a jockey pulley 69 is provided to take up the slack.

The holding arrangement 18 provides a platform 70 onto which a piece of wood desired to be worked on is clamped by means of clamps 74 while being aligned by an aligning member 72. The platform 70 is also positionable with a piece of wood extending transverse to the cutting axis 28 $§40 of the cutter facility 12. The position shown in figure 1 is normally used when a tenon is cut. The tenoner 10 is in fact normally set up to repetitively cut successive tenons onto the ends of similar pieces of wood.

To permit desirable adjustment of the cutting platform 70 it is double action transverse slidably mounted to a platform support 76. The support 76 comprises an upper member 78 obliquely slidably sitting on a lower member 80. Relative sliding between the members 78 and 80 results in vertically adjusting the position of the platform 70 with respect to the cutter facility 12. The member 80 is in turn slidably mounted to the frame 22 to centralise the platform 70 once its vertical position has been set. The members 78 and 80 are releasably securable to one another while the member 80 is also conventionally releasably securable to the frame 22 via a base plate 82. The base plate 82 sits on a pair of rails passing along slots 84 in its bottom to enable its pre-adjustment in the axial direction of the cutter 16.

Although not shown, the support 76 is fitted with a conventional aligning arrangement permitting its vertical and horizontal setting.

In use a piece of wood 73 desired to be tenoned is thus in properly aligned relationship clamped to the platform 70, as shown in broken lines. The cutter facility 12 is suitably radialy positioned on the back plate 48 to cut a tenon of desired dimensions as engageable with a corresponding mortice. The length of the linear cutting action between the notches 38 is matched with the end length of the piece of wood 73 while its width, as defined by the radial positioning of the cutter facility 12 on the back plate 48, is selected to fully cut away the wood except for the tenon. The mechanism 20 is then used to smoothly cut the tenon.

With the lever 42 pulled to its extreme position along the template 46 and beyond, for example, the notch 38.1, while the plungers 50 are located in the slot 32 in such a way that the axis 29 of the cutter facility 12 is above the axis 30, the motor 64 is activated. As the piece of wood 73 is already positioned in the path of the cutting bit 16 on mounting, interference between the bit 16 and the piece of wood 73 is at the outset prevented as the lever 42 is positioned at its extreme position, as discussed above. With the bit 16 running the lever 42 is manually moved to the right. Passing of the left hand notch 38.1 is achieved by simply maintaining the button 44 depressed. Once having so passed, the button 44 is released resulting in it engaging with the right hand notch 38.2 once having reached this position. 2 8 65o4 0 In the process the top part of the wood end is cut away and the upper side of the tenon formed.

To form the appropriate semi-circular end part the sub-mechanism 26 is now used. While the clip 40 is maintained in the notch 38.2, the plungers 50 are lifted from their slot 32 by means of the arm 56 and the arm used to swivel the shaft 28 clockwise through 180 degrees till the plungers 50 engage with the slot 32 again. Swivelling of the shaft 28 causes the cutter facility 12 and thus the bit 16 to describe a semi-circular arc owing to being off centre mounted with respect to the axis 30 of the shaft 28. The mechanism 26 is thus displaced between its end positions with this action. In the process the bit 16 cuts away the wood at the one end of the piece 73 forming a smooth semi-circular tenon end part. The button 44 is now depressed again thus releasing the clip 40. The lever 42 is then moved to the left until the clip engages with notch 38.1 resulting in the bottom side of the tenon being formed. Again the plungers 50 are lifted from the slot 32 by means of the arm 56 and the latter used to again clockwise swivel the shaft 28 through 180 degrees thus completing the tenon by forming its left hand end.

Although not specifically described, the tenoner can also be used as a mortice cutting device. The cutting device 16 is thus replaced by a mortice cutter mounted on a table ensiling to and from displacement for cutting a mortice. In such case only the linearly displaceable cutting pattern sub-mechanism 24 will be used when making a cut.

It is an advantage of the invention specifically described that a simply operable manually manipulable tenoner is provided for forming professional close fitting mortice and tenon joint formations.

T HZ. 28 65 AO Page 11 Mr.

Claims (1)

1. Claims The claims defining the invention are as follows :- (1) A cutting device for cutting material in response to the action of a cutting bit comprising; - a conventionally powered rotary motion cutter facility of the kind performing its main cutting action in response to lateral displacement relative to the cutting axis of the cutter facility between it and material being cut, - a holding arrangement for holding material intended to be cut in a cutting relationship with respect to the cutter facility, and - a manually manipulateable displacement arrangement coacting with at least one of the cutter facility and the holding arrangement for causing the cutter facility to describe at least one cutting pattern of pre-determined shape comprising at least a smooth curve, in response to relative movement between the cutter facility and the holding arrangement as brought about by the manual operation of an appropriate, and at least smooth curve singular action, cutting pattern describing mechanism, involving displacement according to a specific stop layout, at least in the case where the cutting pattern describing mechanism performing the singular cutting action does not describe a pattern extending closed loop, to enable at least one of the repetitive performance of the pattern described by the cutting pattern describing mechanism and, in the appropriate case, and with the cutting pattern describing mechanism being arranged to perform a plurality of cutting actions, the formation of a complementary cutting pattern male - female fashion mateable with the cutting pattern which it complements owing to involving at least one of the cutting actions, the stop layout, in the case of the mechanism providing a cutting pattern, involving a plurality of cutting actions, providing the various stop positions for each of the cutting actions with the pattern, as being formed continuously as a result of the operation of the cutting pattern describing mechanism, being achieved when all but one of the sub-mechanisms constituting the cutting pattern describing mechanism being situated in the appropriate one of its stop positions while manually causing the sub-mechanism not so positioned to be displaced between its stop positions, and selecting the appropriate next one of the sub-mechanisms once a cutting action being performed has reached its stop position, until the desired pattern is achieved. THOMAS IGNATIUS JACOBUS NAUDE 28 654 0 Pagel2 (2) A cutting device as claimed in claim 1 in which the displacement amugement coacts with the cutter facility with the holding arrangement thi s remaining stationary when the device is used to perform its cutting •imction. (3) A cutting device as claimed in claim 2 in which the smooth curve cutting pattern describing mechanism is arranged to describe a smooth curve cutting action in the form of at least an arcuate part of a circle, if not the full circle , owing to the cutter facility being mounted to be swivelled about an axis parallel to and spaced from its cutting axis. (4) A cutting device as claimed in claim 3 in which the cutting pattern describing mechanism is arranged to also perform a linear motion cutting action owing to including a rotary cutter linearly displaceable cutting pattern describing sub-mechanism constrained to move between a plurality of stop positions comprising at least two end stop positions, in addition to the at least partly circular cutting pattern describing mechanism as also forming a sub-mechanism, a pattern including at least one linear part and one arcuate part thus being performable by means of the device. (5) A cutting device as claimed in claim 4 in which the at least partly circular cutting pattern describing sub-mechanism is arranged to perform a full circle constituted by two semi-circular cutting actions with the cutting pattern describing mechanism being arranged to cut a pattern comprising at least a linear part having a semi-circular part extending tangential to each end of the linear part. • (6) A cutting device as claimed in claim 5 in which the cutting pattern is constituted by two parallel linear parts bridged by semi-circular end parts thus extending oblong closed loop fashion, the pattern being constituted by two parallel linear cutting actions separated by the diameter of the semicircular actions from another as formed by using the linearly displaceable and semi-circle cutting pattern describing sub-mechanisms, changing from a linear cutting action to a semi-circular cutting action involving changing from the linearly displaceable sub-mechanism to the arcuately displaceable sub-mechanism and vice versa with the one cutting pattern describing sub-mechanism being maintained in the appropriate one of its end stop positions while the other one is caused to move between its end stop positions. THOMAS IGNATIUS JACOBUS NAUDE 3 - ^ 2 §,J5 4 0 age (7) A cutting device as claimed in claim 6 in which the linearly displaceable sub-mechanism includes a slide member mounted to slide along the at least one slot of a slot providing arrangement between stop positions in response to its manual urging in the desired, and from which the rotary motion cutting facility extends with its axis of rotation being transverse to the sliding direction of the slide member. (8) A cutting device as claimed in claim 7 in which the linearly displaceable cutting pattern describing sub-mechanism includes an arm manually to and fro movable fashion interacting with the slide member for its appropriate displacement. (9) A cutting device as claimed in claim 8 in which the end positions of the slide member along its sliding path is provided by fixed notches appropriately spaced and engageable by a manually operable clip being operable in conjunction with the arm and biassed to engage with a notch, the clip thus being manually disengaged from the one end position providing notch on commencing linear movement of the slide member while engaging with the other notch once the full linear path has been traversed. (10) A cutting device as claimed in claim 9 which includes a replaceable notch providing member to template fashion cater for a variety of slide member linear path lengths. (11) A cutting device as claimed in any one of claims 7 to 10 in which the semi-circular cutting pattern describing sub-mechanism, as causing the swivelling of the cutter facility about an axis resulting in tangential joining between the linear motion and the semi-circular cutting actions, includes a manually swiveleable cutter facility mounting member mounted to be swivelled about an axis coinciding with the axis located at the leading end of the slide member and to which the cutter facility is desirably off centre with respect to the swivelling axis of the mounting member mounted. (12) A cutting device as claimed in claim 11 in which the cutter facility mounting member is fixed to the slide member which is shaft fashion mounted to swivel, in addition to being slid to and fro, with an at least one arcuate movement stop formation, as be>ng displaceable in conjunction with the slide member, performing its function by being in such a way arcuately displaceable between two stop positions as not to interfere with the sliding movement of tic-, linear sliding formation sub-mechanism when in either of its stop positions and vice versa. THOMAS IGNATIUS JACOBUS NAUDE '3> •■!>"• TC 286540 Page |4 /-5- (13) A cutting device as claimed in claim 12 which the stop positions of the semi-circular cutting pattern describing sub-mechanism, as forming part of the cutting device stop layout, is provided by the at least one stop formation as located off centre with respect to the axis of and remote from the position of the cutter facility mounting member to the slide member while being swiveleable in conjunction with the slide member and being biassed, while manually retractable, to engage firmly but displaceable along the at least one slot of the slot providing arrangement along which the slide member is slideable, the stop formation being positioned at an arcuate distance a quarter turn spaced from the position of the cutter facility with respect to the axis of the slide member resulting in engagement of the stop formation with the slot, as providing the stop positions of the semi-circular cutting pattern describing sub mechanism as being half a circle spaced from one another, when the cutter facility is tangential to a linear displacement action of the linear displacement cutting pattern describing mechanism. (14) A cutting device as claimed in claim 13 in which the semi-circular cutting pattern describing sub-mechanism includes two arcuate movement stop formations diametrically opposing one another with respect to the axis of the slide member thereby promoting a firm maintenance of the semicircular cutting pattern describing sub-mechanism in either of its end positions, swivelling of the semi-circular cutting pattern performing sub-mechanism being able to be commenced with once the stop formations are caused to be manually retracted from the slot with which they engage when the semi-circular cutting pattern describing sub-mechanism is in an end position via a manually operable retracting arrangement. (15) A cutting device as claimed in claim 14 in which the retracting mechanism is provided by a lever mounted to urge against a arcuate movement stop formation connecting piece when manually put under force thereby retracting the formations from the slot. (16) A cutting device as claimed in any of claims 11 to 15 which includes an adjustment mechanism for adjusting the spacing between the axis of the cutter facility is positioned in response to radial displacement of the cutter facility along its mounting member. THOMAS IGNATIUS JACOBUS NAUDE 28 6540 PageJ5 (17) A cutting device as claimed in any one of claims 7 to 16 in which the slot providing arrangement is provided by a pair of slot defining members defining aligned parallel slots along which the slide member is slideably mounted with the arm being displaceable between the slot defining members intermediate the two end positions of the slide member. (18) A cutting device as claimed in any of claims 7 to 18 which the linearly displaceable member is mounted along slide blocks fitting firmly but smoothly displaceable along the at least one slot of the slot arrangement to promote achieving identical successive patterns. (19) A cutting device as claimed in any one of the preceding claims in which the rotary motion cutter is driven via a drive mechanism comprising a remotely mounted motor driveably connected to the cutter via a drive belt running along a drive pulley mounted on an extension of the shaft of the pulley, the mechanism including a jockey pulley to accommodate for the variation in distance between the motor and the drive pulley in response to variation in distance between the motor and the drive pulley in response to variation in the distance between the cutter and the motor on displacement of the cutter owing to performance of its cutting action(s). (20) A cutting device as claimed in any of the preceding claims in which the cutter facility provides for chuck fashion replacement of a cutting bit. (21) A cutting device as claimed in claimed in any one of the preceding claims in which the a holding arrangement provides for adjusting the position of a piece of material desired to be cut horizontally and vertically laterally with respect to the cutting axis of the cutter as well as in its cutting direction while being firmly held while including a stop facility for limiting travel in the cutting direction thereby determining the depth of a cutting action into material so firmly held. (22) A cutting device as claimed in claim 21 in which the holding arrangement also includes a calibrating arrangement for pre-calibrating its position relative to the cutter device for facilitating the cutting of male/female engaging patterns in different pieces of material desired to be joined. (23) A cutting device substantially as described with reference to the accompanying drawings. THOMAS IGNATIUS JACOBUS NAUDE 8 - MAY 1996 END OF CLAIMS