EP2403695A1 - Improved compound chop sawing machine - Google Patents
Improved compound chop sawing machineInfo
- Publication number
- EP2403695A1 EP2403695A1 EP09785837A EP09785837A EP2403695A1 EP 2403695 A1 EP2403695 A1 EP 2403695A1 EP 09785837 A EP09785837 A EP 09785837A EP 09785837 A EP09785837 A EP 09785837A EP 2403695 A1 EP2403695 A1 EP 2403695A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- work head
- blade
- configuration
- guard device
- machine
- 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
Links
- 150000001875 compounds Chemical class 0.000 title claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 31
- 230000004913 activation Effects 0.000 claims abstract description 5
- 230000009849 deactivation Effects 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims 1
- 230000004888 barrier function Effects 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 230000000284 resting effect Effects 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
Definitions
- the present invention relates to a compound chop sawing machine for cutting a workpiece into section members, bars and the like.
- chop sawing machines and in particular compound chop sawing machines, i.e. machines having two different work tables, an upper and a lower work table respectively, for carrying out cutting of section members, bars, wood laths for skirting boards and other artefacts .
- These types of machines are generally used in situ, e.g. in building yards for cutting off the above mentioned artefacts .
- These machines comprise a work head that is movable relative to the lower work table and manually operable by handle members; the work head is provided with a cutting member, generally a powered rotary blade, for carrying out chopping and/or squaring operations on the pieces resting on the lower work table.
- the work head is pivotally associated with the lower work table relative to at least one rotation axis substantially parallel to the plane defined by the lower work table .
- the upper region of the work head is substantially planar to define the upper work table which is provided with a slot from which the upper portion of the cutting member emerges for cutting the pieces positioned on said upper work table and rigidly fastened thereto by means of abutment elements and screw threaded fastener means.
- guard members for the exposed portion of the cutting member must be present, which cutting member is to be inaccessible during both the use steps and the inactive steps of the machine, and manual removal of which must be inhibited.
- guard members generally used in accordance with the provisions of the law in these types of machines, consist of a barrier element rigidly associated with the lower region of the work head, at the lower portion of the cutting member.
- guard devices for protecting the exposed portion of the cutting member consist of one or more casings fitted on a blade portion and hinged on the work head so as to follow the forward movement of the cut by insertion into a seat of the work head in a concealable manner and to determine the maximum practicable cut depth.
- these guard devices contemplate the presence of temporary locking means to lock the casing position in a configuration for protection of the exposed blade portion, which locking means can be manually activated by the operator.
- these machines of known type are not devoid of drawbacks, among which it is to be mentioned that fact that this fixed barrier element constitutes a great hindrance to the normal cutting operations, when pieces of an irregular conformation are to be cut, for example.
- the barrier element constitutes a limit to the work head's stroke relative to the lower work table and, therefore, to the amplitude of the active portion of the cutting member itself, above all in those configurations in which the cutting member is inclined to the lower work table .
- Another aim of the invention is to make available a simple structure, to be put into practice in a relatively easy manner, of safe use and efficient operation, as well as of relatively reduced cost.
- the main task mentioned and the aims specified are substantially achieved by the present compound chop sawing machine comprising: - a base defining at least one work table for support of at least one workpiece;
- At least one work head associated with said base, which is movable relative to said work table and provided with a rotary circular blade at least partly emerging from said work head and exposed for cutting of said piece, said work head comprising at least one auxiliary work table, for support of a further workpiece, associated on the upper part with said head and provided with at least one slot from which at least the upper portion of said blade emerges;
- At least one guard device for at least one exposed portion of said blade, at the lower active portion thereof, which is alternately movable between a configuration at which it is retracted in said work head to release said active portion for engagement with said workpiece and an extended configuration at which it covers said at least one exposed portion;
- FIG. 1 is an elevation side view of the chop sawing machine in accordance with the invention, with the work head in an upper end-of-stroke configuration;
- FIG. 2 is an elevation side view of the chop sawing machine of the invention, with the work head in a lower end-of-stroke configuration;
- FIG. 3 is an elevation side view of the chop sawing machine seen in Fig. 1 in a step of machining a workpiece;
- FIG. 4 is a partial sectional side view of Fig. 1;
- FIG. 5 is a partial sectional side view of an alternative embodiment of a chop sawing machine in accordance with the invention, with the work head in a lower end-of-stroke configuration;
- FIG. 6 is a view as in Fig. 4 with the covering element in a blade-exposure configuration
- Fig. 7 is a view as in Fig. 5 with the covering element in a blade-covering configuration.
- a compound chop sawing machine comprising a base 2 defining at least one work table 3 for support of at least one workpiece P.
- the work table 3 for example can be of the type rotating about a substantially vertical axis and can have means for temporarily clamping the workpiece, of the vice type or the like for example, not shown in detail as it is of known type.
- the sawing machine 1 comprises at least one work head 4 associated with base 2, which head is movable relative to the work table 3; for instance, the work head is pivotally associated with base 2 for rotation relative to at least one axis substantially parallel to the work table 3 following a rotation Rl shown in the figure.
- the work head 4 is provided with a circular blade 5 having a region at least partly exposed relative to the work head and rotationalIy driven, by motor means 6 of a type known to a person skilled in the art, for cutting of the workpiece P.
- the work head 4 in the preferred embodiment shown in the figures, has an auxiliary work table 3' adjustably associated with the upper portion of the work head; the auxiliary work table is provided with a through slot, from which the upper portion of blade 5 emerges for cutting of a further piece P.
- adjustment concerns the distance between the auxiliary work table 3 ⁇ and the hinging axis of the blade 5 on the work head 4, so that the cut depth imparted to the further piece P by the upper portion of blade 5 emerging from the auxiliary work table can be adjusted.
- the work head 4 is for instance pivotally associated with base 2 relative to two distinct rotation axes, i.e. a first axis orthogonal to the lying plane of blade 5 for moving the work head close to/away from the work table 3 following rotation Rl, and a second axis parallel to said lying plane for inclination of the work head 4, and therefore the blade itself, to the work table 3, which rotation is identified by reference R2.
- the sawing machine 1 comprises at least one guard device 7 for at least one exposed portion of blade 5 at its active portion 5a.
- the guard device 7 is alternately movable between a retracted configuration inside the work head 4, so as to release the active portion 5a of blade 5 for engagement on the workpiece P and an extended configuration covering at least said exposed portion.
- the machine 1 comprises removable locking means to lock the guard device 7 in at least one of the retracted and extended configurations .
- the locking means is of the type involving automatic activation/deactivation .
- the locking means can be automatically activated upon positioning of the guard device 7 in a retracted and in an extended configuration.
- the locking means can be automatically deactivated upon displacement of the work head 4 from at least one upper end-of -stroke configuration to a lower end-of-stroke configuration, at which the work head is respectively fully moved away from the work table 3 and/or fully moved close thereto.
- the locking means comprises removable interconnection means 8 interposed between at least two of the work head 4 , guard device 7 and base 2.
- the interconnection means 8 can be advantageously automatically activated upon positioning of the guard device 7 to the retracted and/or extended configuration or, alternatively, upon positioning of the work head 4 to the upper and/or lower end-of-stroke configuration.
- the guard device 7 in the particular embodiment shown in the figures comprises at least one first and one second circular sector, 9 and 10 respectively, which are pivotally associated with the work head 4 around respective rotation axes substantially parallel to the rotation axis of blade 5.
- the first and second circular sectors, 9 and 10 comprise at least one first and one second plate 11 and 12 respectively, which have a lune-shaped conformation and are substantially disposed in coplanar relationship with blade 5 in the vicinity of the blade itself.
- each plate 11, 12 has a peripheral edge, 11a and 12a respectively, which is turned up in a U-shaped conformation for holding the corresponding portion of blade 5.
- the first and second circular sectors, 9 and 10 respectively are interconnected with each other by mutual-drive means and at least partly overlapped.
- the drive means comprises at least one stud 13 protruding in a transverse direction from at least one of the first and second plates, 11 and 12 respectively, which through progressive opening of said plate, is progressively slidably guided within a guide 14 associated with the other of the first and second plates.
- the first plate 11 is pivotally associated with the work head 4 in coaxial relationship with blade 5 and comprises feeler means 15 following the profile of the workpiece P .
- the feeler means 15 is associated with one end of the first plate 11 facing the workpiece P for urging the first plate from the extended to the retracted configuration, against the action of spring means 16 and upon advancing of the cut on the workpiece P.
- the feeler means 15 for instance comprises a roller rotatably associated with the end of the first plate 11 facing the workpiece P and resting on said piece during the working step thereof.
- the second plate 12 in turn, is rotatably associated with the work head 4, with its rotation axis substantially parallel to and distinct from the rotation axis of blade 5, as in the particular embodiment shown in Fig. 5, for example.
- the interconnection means 8 comprises at least one catch 17 to retain the first plate 11, which catch is associated with said plate and removably insertable into at least one housing seat 18 associated with at least one of the base 2 and the work head 4 in order to retain the guard device 7 in the retracted configuration.
- the interconnection means 8 comprises at least one tailpiece 19 associated with base 2 in a rocking manner relative to an axis substantially orthogonal to the rotation axis of blade 5.
- the housing seat 18 is advantageously made at the tailpiece 19.
- the tailpiece 19 is adapted to follow the inclination rotation R2 of the work head 4, but not the rotation Rl of same.
- the work head 4 is in fact pivotally associated with the tailpiece 19, which tailpiece co-operates with the guard device 7 for protection of at least one exposed portion of blade 5 when the guard device is in its extended configuration or, in an equivalent manner, the work head 4 is in its upper end-of-stroke configuration.
- the tailpiece 19 is suitable for protection of the remaining portion of blade 5 that is not covered by the guard device 7 when the work head 4 is in its upper end-of-stroke configuration, fully moved away from the work table.
- the interconnection means 8 further comprises at least one pin 20 associated with at least one of the work head 4 and the guard device 7.
- the interconnection means 8 comprises at least one interconnecting lever interposed between at least the first plate 11 and the work head 4.
- the interconnection means 8 comprises a plurality of interconnecting levers and advantageously, a first interconnecting lever 22a hinged on the work head 4, a second interconnecting lever 22b hinged on the end of the first plate 11 distal from the peripheral edge 11a, and at least one intermediate interconnecting lever 22c linked to the above levers and hinged on the work head 4 in the vicinity of its centre line.
- the end of the first plate 11 distal from the peripheral edge 11a is positioned on the side opposite to the peripheral edge relative to the rotation axis of the first plate.
- Pin 20 in the preferred embodiment is associated with the intermediate interconnecting lever 22c and is guided along at least one substantially L- shaped slot 23 and associated with the second interconnecting lever 22b.
- Recess 21 is made at an end of slot 23 for locking pin 20 when the guard device 7 is in the extended configuration.
- the spring means 16 consisting of a helical spring for example, are directly interposed between the first interconnecting lever 22a and the intermediate interconnecting lever 22c for return of the guard device from the retracted configuration to the extended configuration, insertion of pin 20 into recess 21 and, therefore, locking of the guard device 7.
- catch 17 for retaining the first plate 11, in the particular embodiment shown in the figures is rigidly associated with the second interconnecting lever 22b; due to rotation of the work head 4 from the upper end-of-stroke to the lower end-of-stroke configurations the retaining catch is fitted into the housing seat 18 associated with the tailpiece 19 in a rigid and adjustable manner for locking the guard device 7 to the extended configuration.
- the work head can comprise guard means 24 for the upper portion of the blade, of the type for example involving a casing pivotally associated with the auxiliary work table 3 ' and adapted to fit the upper portion of blade 5 under non-use conditions of the latter.
- the guard device 7 comprises at least one covering element 25 to cover the exposed portion of blade 5 proximal to the hinging point of the work head 4 on base 2.
- the covering element 25 is in particular suitable for protection of the remaining portion of blade 5 that is not covered by the first and second circular sectors 9 and 10 when the work head 4 is in its lower end-of-stroke configuration, fully approaching the work table itself.
- blade 5 particularly under non use conditions of the machine 1 or during cutting operations carried out on the auxiliary table 3 ' , appears to be fully protected both when the work head 4 is in the upper end-of-stoke configuration and when it is in the lower end-of-stroke configuration .
- the covering element 25 is alternately movable between a configuration for protection of blade 5 when the work head 4 is positioned in the lower end-of- stroke configuration and a configuration at which the blade is exposed. In particular, as shown in Figs.
- the covering element 25 is rotatably and/or slidably associated with the tailpiece 19 being provided with means for converting the rotary motion for moving the work head 4 close to/away from the work table 3 into a rotation/translation motion of the covering element itself for passage of the latter from the covering configuration to the exposing configuration and vice versa.
- the converting means may for instance be of the cam-rocker arm type or consist of other technically equivalent means and is not shown in the drawings as it is known to a person skilled in the art.
- the machine 1 particularly comprises a pair of tailpieces 19 and a pair of covering elements 25 disposed on the opposite side relative to blade 5. Operation of the present invention is as follows.
- the locking means of the guard device 7 is activated; in particular, pin 20 is fitted in recess 21 and the first and second interconnecting levers 22a and 22b, as well as the intermediate interconnecting lever 22c are restrained from rotating by mutual jamming so that, as a result, any rotation of the first and second plates, 11 and 12 respectively, is prevented.
- the guard device is locked in the extended configuration, the operator can carry out the loading and clamping operations of the workpiece P on the work table 3 in a safe manner. Once the piece P is ready for being worked, through rotation of the work head 4 blade 5 is moved close to the workpiece.
- blade 5 is protected by the guard device 7 that remains in the extended configuration by effect of the spring means 16.
- the guard device 7 progressively uncovers it, against the action of the spring means 16, during advancing of the cut due to the feeler means 15 resting on the piece itself while the so-called exposed portion of the blade is left in any case covered.
- the retaining catch 17 is inserted, due to rotation of the work head relative to the tailpiece 19, in the housing seat 18 retaining the second interconnecting lever 22b and the first plate 11 therewith and preventing rotation of said lever.
- blade 5 is inaccessible and protected, enabling the operator to carry out working operations in a fully safe manner.
- blade 5 is progressively covered by the first and second plates 11 and 12, urged by the spring means 16, enabling the operator to carry out removal of the worked piece P in a safe manner .
- the chop sawing machine of the invention allows the cutting, chopping and squaring operations to be carried out in a fully safe manner for the operator .
- the above described chop sawing machine ensures a good cutting efficiency, enabling wide sectors of the active portion of the cutting member to come into contact with the workpieces, irrespective of the angle of inclination of the cutting member to the lower work table and of the shape of the workpiece .
- the invention as conceived allows a compound chop sawing machine to be obtained which at the same time offers quickness in cutting, good cut efficiency and high protection degree for the operator, together with a simple structure of relatively easy practical achievement, safe use and efficient operation, and in addition a relatively reduced cost .
- the invention as conceived is susceptible of many modifications and variations, all falling within the scope of the inventive idea.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IB2009/000489 WO2010100521A1 (en) | 2009-03-06 | 2009-03-06 | Improved compound chop sawing machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2403695A1 true EP2403695A1 (en) | 2012-01-11 |
EP2403695B1 EP2403695B1 (en) | 2015-01-07 |
Family
ID=40935649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09785837.7A Not-in-force EP2403695B1 (en) | 2009-03-06 | 2009-03-06 | Improved compound chop sawing machine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2403695B1 (en) |
WO (1) | WO2010100521A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8220372B2 (en) | 2009-04-28 | 2012-07-17 | Credo Technology Corporation | Combination table-miter saw safety system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0473101A (en) * | 1990-07-16 | 1992-03-09 | Ryobi Ltd | Variable cutting angle circular saw |
CA2096786A1 (en) * | 1992-08-13 | 1994-02-14 | Andrew Lubomir Itzov | Motorized saw with movable blade guard actuating linkage |
JP2007111945A (en) * | 2005-10-19 | 2007-05-10 | Makita Corp | Cutting machine |
AU2007200238B9 (en) | 2006-01-31 | 2012-06-14 | Black & Decker Inc | Saw |
-
2009
- 2009-03-06 EP EP09785837.7A patent/EP2403695B1/en not_active Not-in-force
- 2009-03-06 WO PCT/IB2009/000489 patent/WO2010100521A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010100521A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010100521A8 (en) | 2010-11-11 |
EP2403695B1 (en) | 2015-01-07 |
WO2010100521A1 (en) | 2010-09-10 |
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