FR2931382A1 - Cutting device for use in cutting machine, has elastic maintaining units to maintain each cut assembly in one of notch of tool support, where units take back cut assembly in separated position of sidewall of notch of tool support - Google Patents

Abstract

The device has a rotary tool support (1) formed of an annular rotary body (2) with two external radial notches (4), where the tool support is equipped with two cut assemblies. Each cut assembly has a cutter-bar (7), a cutting blade (8) and a deflector (9). Elastic maintaining units (10) i.e. push button, maintain each cut assembly in one of the notch of the tool support. The maintaining units are arranged between a lateral sidewall (5) of the notches and one of the cut assemblies, and take back the cut assembly in a separated position of the sidewall of the notch of the tool support.

Description

The present invention relates to a cutting device for a cutting machine, with manual or mechanized feed, of parts to be cut, as well as a tool holder for such a cutting device.

It relates more particularly to a cutting device comprising: - on the one hand a rotary tool holder formed of an annular rotating body, or cylindrical hollowed out centrally, said body having at least two external radial notches, io - on the other hand to at least two cutting assemblies each comprising a blade holder, a cutting blade and possibly a deflector, said cutting assemblies being able to insert each in a removable manner, between the lateral flanks of a notch of the tool holder, preferably to a bearing position against the bottom of the notch in which each cutting blade extends substantially parallel to and opposite a side flank of the notch.

Such cutting devices are well known to those skilled in the art as illustrated in particular in FR-2,888,524. In this cutting device, the blade holder is a centrally recessed cylindrical body. This blade holder, one of whose end faces is equipped with a cutting blade, is held in the notch of the tool holder by an axis passing through its central recess. Such a solution is suitable in the case of small blade holder. However, the tendency is to increase the size of the blades and consequently of the blade holders so that on the one hand, a hole from one end of the blade holder from one end face to another becomes more laborious and that on the other hand, any compensation for dimensional variations, in particular thickness, resulting from a sharpening of the blade is difficult. The result, after sharpening, a vibration of the blade. An object of the present invention is to provide a cutting device and an associated cutting tool whose designs allow to absorb the dimensional changes resulting from sharpening the blade and thus to eliminate any risk of subsequent vibration of the blade.

Another object of the present invention is to provide a cutting device and an associated tool holder whose designs make it easier to set up the clamping means by easy pre-assembly of the cutting assembly, allowing the subsequent laying hands free clamping means.

Another object of the present invention is to provide a cutting device and an associated tool holder whose designs make it possible to increase the range of dimensional tolerances of said parts.

For this purpose, the subject of the invention is a cutting device for a cutting machine, with manual or mechanized advance, of parts to be cut, the device comprising: on the one hand a rotary tool-holder formed of a body annular rotator, or cylindrical recessed centrally, said body having at least two external radial notches, - on the other hand at least two cutting assemblies each comprising a blade holder, a cutting blade and optionally a deflector, said cutting assemblies each being capable of being inserted in a removable manner, between the lateral flanks of a notch of the tool holder, preferably to a bearing position against the bottom of the notch in which each cutting blade extends substantially parallel to and opposite a lateral flank of the notch, characterized in that the device comprises at least elastic means for holding each cutting assembly in a notch of the tool holder, said elastic means holding pins arranged at least between a lateral flank of the notch of the tool holder and said cutting assembly reminding said cutting assembly in a position spaced from said lateral flank of the notch of the tool holder. Thanks to the presence of elastic means for holding the cutting assembly in the notch, any variation in the dimension of the blade carried by the blade holder and resulting from a sharpening is absorbed by the deformation of said elastic means of cutting. so that no vibration of the blade develops.

Similarly, the presence of these elastic holding means allows easy pre-assembly of the cutting assembly in the notch so that the subsequent attachment of the blade holder to the tool holder by means of appropriate clamping means can operate hands free.

The invention also relates to a tool holder for a cutting device for a manual or mechanized feed cutting machine, to pieces to be cut, the said tool holder comprising at least two opposite external radial notches each intended for the reception of a cutting assembly comprising a blade holder, a cutting blade and possibly a baffle, each cutting assembly being adapted to be inserted between the lateral flanks of a notch, preferably to a bearing position on the bottom 15 of the notch, characterized in that at least one of the lateral flanks of at least one of the notches is equipped with elastic means, such as a push button, recalled in a position in which they are protruding inside the notch, for maintaining said cutting assembly associated with the state inserted in said notch. The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which:

Figure 1 shows a perspective view in exploded position of the elements constituting a cutting device according to the invention;

FIG. 2 represents an exploded perspective view of the constituent elements of another embodiment of a cutting device according to the invention and FIG. 3 represents a cross-sectional view of the cutting device according to FIG. the invention, wherein a blade holder is shown with a baffle, the other without, to illustrate in sectional view form both the embodiment of Figure 1 and that of Figure 2.

As mentioned above, the cutting device comprises at least one rotary tool holder 1 and at least two blade holders 7 each capable of carrying at least one cutting blade 8, and possibly a deflector 9, blade holder 7, cutting blade 8 and optionally deflector 9 forming each time a cutting assembly.

The rotary tool holder 1 is intended to be mounted for example on a spindle shaft to which it can be coupled firmly in rotation. The assembly is thus rotated to allow the machining of parts moved in the vicinity of said body in a direction substantially perpendicular to the longitudinal axis of the spindle shaft carrying said body. In the examples shown, the body 2 of the tool holder 1 is a centrally recessed cylindrical body, the central recess having been shown at 3. A similar solution could have been to use an annular tool holder body, in particular a ring such a body being more particularly suitable for blades of smaller size.

The device also comprises at least two blade holders 7 each capable of being inserted, with their cutting blade 8, and possibly a baffle 9, removably, between the lateral flanks 5 of a notch 4 of the tool holder 1 In the inserted position, each cutting blade 8 extends substantially parallel to and opposite a lateral flank of the notch 4.

Generally, the cutting assemblies and, in particular, the blade carriers are identical from one blade holder to another. Characteristically according to the invention, the device comprises at least, disposed at least between a lateral flank of the notch 4 of the tool holder 1 and a cutting assembly, resilient means 10 for holding said cutting assembly in a notch 4 of the tool holder 1, said holding means reminding said cutting assembly in the spaced apart position of the side flank 5 of the notch 4 of the tool holder 1 contiguous to said holding means.

With these resilient holding means 10, which are carried by the cutting assembly, or respectively the tool holder 1, and rest on the tool holder 1, or respectively on the cutting assembly, the set of The cutter is simply held in position in its notch so that subsequent attachment of the blade holder to the tool holder can be effected with hands free.

For this purpose, the device further comprises means 15 for holding each blade holder 7 of a cutting assembly inside a notch 4 of the tool holder 1, said means 15 for holding by screwing exerting radial pressure on the blade holder 7.

In the examples shown, the means 15 for holding a blade holder 7 by screwing inside a notch 4 comprise at least one clamping member 15, such as a screw, capable of being inserted into a 16 radial bore shoulder of said blade holder 7 and a thread 17 in correspondence of the tool holder 1, the dimensions of the inner periphery of the radial bore 16 of the blade holder being greater than the diameter of the body of the clamping member 15 in order to allow the absorption of the variations of position of the blade holder 7 resulting from wear of the cutting blade 8.

Indeed, the relative dimensions of the bore 16 of the blade holder and the body of the screw 15 allow a displacement of the cutting assembly between the lateral flanks 5 of the notch 4 of the tool holder to adapt to reducing the thickness of the cutting assembly resulting from sharpening the blade. Despite this possibility of shifting the blade holder, the bore 16 of the blade holder and the tapping 17 of the tool holder remain aligned and form an insertion passage of the screw body 15 which is screwed until it comes into contact. stop of the screw head against an inner shoulder of the bore 16 as shown in Figure 3. In this position, the blade holder is perfectly maintained in the tool holder 1.

In the examples shown, it is noted that the tool holder 1 comprises two radial tappings 17 and the blade holder has two radial bores 16 each capable of coinciding with a tapping 17, each tapping assembly 17-bore 16 receiving a screw 15. These 16-tapped bore assemblies 17 are offset axially along an axis parallel to the axis of rotation of the tool holder.

To facilitate the insertion of the blade holder into the tool holder and its elastic retention in a first step, at least a portion of the elastic holding means 10 which are carried by the cutting assembly, or respectively the tool holder 1, and rest on the cutting assembly, are retractable inside the blade holder 7 or respectively of the tool holder 1 which carries them.

In the examples shown, the resilient holding means 10 are mounted on the tool holder 1 and retractable into a recess 14 formed in the lateral flank of a notch 4 of said tool holder 1, said resilient holding means 10. making, in the non-retracted state, projecting inside the space delimited by said notch 4. The resilient holding means 20 comprise at least one push-button formed of a spring-loaded ball 12, ball 12 being rotatably mounted to form a rolling contact contact.

In the present case and as illustrated in FIG. 1, the tool holder is equipped, for each notch, with two push buttons axially offset along an axis parallel to the axis of rotation of the tool holder. Each push-button is formed of a ball 12 and a spring 11 housed at least partially inside a cage 13, itself forcibly pressed into the recess 14 formed in the lateral flank of a notch. In the positioned state, the ball 12 of the push button projects partially from the side of the notch in the direction of the interior of said notch. When inserting a cutter assembly into the notch, the ball moves inside its cage by compressing the associated spring. Once the introduction is complete, the ball bears on the cutting assembly and recalls the latter in a position away from the side of the tool holder provided with said elastic means. Generally, the elastic means bear on the face of the blade holder opposite to that carrying the cutting blade 8. When the blade holder is equipped with a deflector 9, they are supported on the deflector.

Note that in the examples shown, cutting blade 8 and deflector 9 are each in the form of a wafer. The deflector 9, also called counterblade, is in the general form of a wafer whose peripheral edge is equipped with a profile identical or homothetic to that of the blade profile. This profile is positioned, in the mounted state of the blade holder on the tool holder, slightly set back from the cutting profile of the cutting blade 8. This deflector 9 is intended to limit the thickness of the chips and therefore the speed of any rejection of the piece of machined wood.

In the examples shown, each blade holder 7 has the shape of a parallelepipedal body having two so-called lateral faces 7A, 7B opposite the sidewalls 5 of the notch 4 and a face 7C opposite the bottom 6 of the notch 4, in the inserted state of the blade holder 7 in a notch 4 of the tool holder 1, the lateral faces 7A, 7B opposite the flanks 5 of the notch 4 serving as a support 7A the cutting blade 8, the other 7B possible support to a baffle 9, blade 8 and, if necessary, baffle 9, being securable (s) preferably by screwing, to the blade holder 7. The blade holder is thus sandwiched between cutting blade 8 and deflector 9 in the presence of a deflector 9. Figure 1 corresponds to the embodiment with deflector, Figure 2 to the embodiment without deflector. Figure 3 is a theoretical view to show the configuration of a baffle cutter assembly and a baffle cutter assembly.

The tool holder is generally equipped with two cutting sets and in particular two identical blade holders. However, the cutting device 30 may comprise at least two types of blade holder 7, the distance between the lateral faces 7A, 7B being different from one type of blade holder to another so as to allow, for the type of door - Largest distance lamina between lateral faces 7A, 7B, removal of the deflector 9.

The baffle-free blades can be used for automatic feed cutting machines.

As illustrated in FIGS. 1 and 2, the cutting blade 8 is provided on its longitudinal edge opposite its cutting edge, in the vicinity of a transverse edge, with a projection 18 forming an axial abutment by pressing on said carrier. 1 during the displacement of the blade holder 7 in a direction parallel to the axis of rotation of the tool holder 1 in order to introduce the cutting assembly into a notch 4 of the door In fact, generally, the blade holder 7, provided with its cutting blade 8 and its deflector 9, is introduced into the notch 4 from an end face of the cylinder constituting the tool holder and then moved. sliding on the bottom of the notch until abutting said blade against an end face of said cylinder. During this sliding movement of the cutting assembly in the notch of the tool holder, the push buttons partially retract into the recess in the side of the notch of the tool holder while remaining resting on the parts facing the cut assembly. The assembly is easy. In abutment position, bore 16 and tapping 17 are aligned.

As mentioned above, the invention also relates to a tool holder 1 for a cutting device for a manual or mechanized feed cutting machine, to pieces to be cut, said tool holder 1 comprising at least two opposite external radial notches 4 each intended to receive a cutting assembly comprising a blade holder 7, a cutting blade 8 and possibly a deflector 9, each cutting assembly being adapted to be inserted between the lateral flanks of a notch 4 , preferably to a bearing position on the bottom 6 of the notch 4, characterized in that at least one of the side flanks 5 of at least one of the notches 4 is equipped with means 10 elastic members, such as a push button, biased into a position in which they project inside the notch 4, for holding said cutting assembly associated with the state inserted in said notch 4.

Claims (10)

REVENDICATIONS1. Cutting device for cutting machine, with manual or mechanized feed, of parts to be cut, the device comprising: - on the one hand a rotary tool holder (1) formed of a body (2) rotary annular, or cylindrical recessed centrally, said body (2) having at least two external radial notches (4), - on the other hand at least two cutting assemblies each comprising a blade holder (7), a cutting blade (8) and possibly a deflector (9), said cutting assemblies being adapted to be inserted each in a detachable manner, between the lateral flanks (5) of a notch (4) of the tool holder (1), preferably to a position d against the bottom (8) of the notch (4) in which each cutting blade (8) extends substantially parallel to and opposite a lateral flank (5) of the notch (4). ), characterized in that the device comprises at least elastic means (10) for holding each cutting assembly in a notch (4) of the holder or til (1), said elastic holding means (10) arranged at least between a side flank (5) of the notch (4) of the tool holder (1) and said cutting assembly reminding said cutting assembly in the remote position said side flank (5) 20 of the notch (4) of the tool holder (1). 2. Device according to claim 1, characterized in that it further comprises means (15) for screwing each blade holder (7) of a cutting assembly inside a notch ( 4) of the tool holder (1), said screw holding means (15) exerting a radial pressure on the blade holder (7). 3. Device according to claim 2, characterized in that the means (15) for screwing a blade holder (7) inside a notch (4) comprises at least one member (15). clamping device, such as a screw, adapted to fit into a stepped radial bore (16) of said blade holder (7) and a thread (17) in correspondence of the tool holder (1), the dimensions of the inner periphery the stepped radial bore (16) of the blade holder 29 being greater than the diameter of the body of the clamping member (15) so as to allow the absorption of the positional variations of the resulting blade holder (7). a wear of the cutting blade (8). 5 4. Device according to one of claims 1 to 3, characterized in that at least a portion of the elastic holding means (10) which are carried by the cutting assembly, or respectively the tool holder (1), and are supported on the tool holder (1), or respectively on the cutting assembly, are retractable inside the cutting assembly or io respectively of the tool holder (1) which carries them. 5. Device according to one of claims 1 to 4, characterized in that the elastic holding means (10) are mounted, on the tool holder (1), retractable in a housing (14) formed in the sidewall ( 5) lateral of a notch (4) of said tool holder (1), said elastic holding means (10) making, in the non-retracted state, projecting inside the space delimited by said notch (4). ). 6. Device according to claim 5, characterized in that the elastic holding means (10) comprise at least one push button formed of a ball (12) loaded by spring (11), said ball (12) being mounted free rotating to form a rolling contact contact. 7. Device according to one of claims 1 to 6, characterized in that each blade holder (7) has the shape of a parallelepiped body having two faces (7A, 7B), called lateral, facing the flanks ( 5) of the notch (4) and a face (7C) facing the bottom (6) of the notch (4), in the inserted state of the blade holder (7) in a notch (4) of the door tool (1), the lateral faces (7A, 7B) facing the flanks (5) of the notch (4) serving one (7A) of support for the cutting blade (8), other (7B) possible support for a deflector (9), blade (8) and, if necessary, baffle (9), being securable (s) preferably by screwing, to the blade holder (7) .Il 8. Device according to claim 7, characterized in that it comprises at least two types of blade holder (7), the distance between faces (7A, 7B) side being different from one type of blade holder to another so as to allow, for the type of remote blade holder the largest between faces (7A, 7B) side, the removal of the deflector (9). 9. Device according to one of claims 1 to 8, characterized in that the cutting blade (8) is provided on its longitudinal edge opposite its cutting edge, in the vicinity of a transverse edge, a protrusion (18) forming an axial abutment by pressing on said tool holder (1) during the displacement of the blade holder (7) in a direction parallel to the axis of rotation of the tool holder (1) for the purpose of introducing the cutting assembly within a notch (4) of the tool holder (1). 15 10. Tool holder (1) for a cutting device for a manual or mechanized feed cutting machine, parts to be cut, said tool holder (1) comprising at least two opposite external radial notches (4) each intended for receiving a cutting assembly comprising a blade holder (7), a cutting blade (8) and possibly a deflector (9), each cutting assembly 20 being adapted to be inserted between the lateral flanks (5) of a notch (4), preferably to a bearing position on the bottom (6) of the notch (4), characterized in that at least one of the lateral flanks (5) of at least one of the notches (4) is equipped with elastic means (10), such as a push button, biased into a position in which they project inside the notch (4), for the maintenance of said cutting assembly associated with the state inserted in said notch (4).