EP4364913A1 - Machine d'usinage électrique - Google Patents

Machine d'usinage électrique Download PDF

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Publication number
EP4364913A1
EP4364913A1 EP23205957.6A EP23205957A EP4364913A1 EP 4364913 A1 EP4364913 A1 EP 4364913A1 EP 23205957 A EP23205957 A EP 23205957A EP 4364913 A1 EP4364913 A1 EP 4364913A1
Authority
EP
European Patent Office
Prior art keywords
gear member
processing machine
gear
spring
joint
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.)
Pending
Application number
EP23205957.6A
Other languages
German (de)
English (en)
Inventor
Felix Daus
Oliver Hähnle
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.)
Mafell AG
Original Assignee
Mafell AG
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
Application filed by Mafell AG filed Critical Mafell AG
Publication of EP4364913A1 publication Critical patent/EP4364913A1/fr
Pending legal-status Critical Current

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Classifications

    • 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
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/16—Saw benches
    • B27B5/18—Saw benches with feedable circular saw blade, e.g. arranged on a carriage
    • B27B5/20—Saw benches with feedable circular saw blade, e.g. arranged on a carriage the saw blade being adjustable according to depth or angle of cut; Radial saws, i.e. sawing machines with a pivoted radial arm for guiding the movable carriage
    • B27B5/208—Saw benches with feedable circular saw blade, e.g. arranged on a carriage the saw blade being adjustable according to depth or angle of cut; Radial saws, i.e. sawing machines with a pivoted radial arm for guiding the movable carriage the saw blade being mounted on a hanging arm or at the end of a set of bars, e.g. parallelograms

Definitions

  • the invention relates to an electrical processing machine, in particular a saw, for example a miter saw or a cross-cut saw.
  • Such processing machines are basically known, for example in the form of so-called cross-cut saws, but also in the form of other machines for processing workpieces made of wood, plastic or metal, for example.
  • the working unit is attached to the frame so that it can move relative to the frame in order to carry out a working movement of the working unit and thus of the processing tool relative to the frame and relative to a workpiece to be processed.
  • miter saws which are used in particular to cut, i.e. shorten, workpieces that usually have an elongated shape, such as wooden strips or rails or pipes made of plastic or metal
  • the working unit equipped with the saw blade is attached to the frame so that it can pivot about a single horizontal axis.
  • miter saws are often required to process relatively large workpieces. This requires a relatively large working area or, in the case of a miter saw, a relatively large cutting length.
  • the work unit is moved linearly in a horizontal direction after being swivelled down, for example by means of guide rods.
  • Miter saws that are provided with such a pulling function along a linear axis are also known as miter-pull saws.
  • the additional linear guide in particular the linear extensions and bearing elements provided for this purpose, mean that such machines require a relatively large installation space and are also relatively heavy.
  • the linear guide is also exposed to relatively large bending loads.
  • the components provided are not very suitable for absorbing such forces. This results in a significant deflection of the system, which ultimately results in imprecise saw cuts.
  • the electrical processing machine is in particular a saw, for example a miter saw or a miter pull saw, and comprises a frame, a working unit having a working tool, a gear via which the working unit is attached to the frame, which is designed to enable a guided working movement of the working unit relative to the frame, and which has a two-stroke mechanism which comprises a first gear member and a second gear member connected to the first gear member by a gear joint, and a mechanism for limiting a working range of the working unit predetermined by the two-stroke mechanism.
  • the mechanism comprises a third gear member and a fourth gear member.
  • the third gear member is connected to the first gear member by a first joint
  • the fourth gear member is connected to the third gear member by a second joint and to the second gear member by a third joint.
  • the processing machine also comprises a spring, in particular a tension spring, for example a helical tension spring or a gas tension spring, which acts on one of the gear members and on the other hand on the frame or another of the gear members.
  • the working unit is attached to the frame via the gear, which enables a guided working movement of the working unit relative to the frame.
  • the gear comprises the two-stroke and the mechanism for limiting the working range predetermined by the two-stroke.
  • the first gear element of the two-stroke mechanism can in particular be hinged to the frame and designed, for example, as a swing arm.
  • the working unit can, for example, be attached to the second gear element.
  • the mechanism provided according to the invention for limiting the working range of the working unit specified by the two-stroke ensures that the working unit cannot reach undesirable positions relative to the frame.
  • the working range is free due to the gear but limited by the mechanism, i.e. the working unit can be moved freely within the limits specified by the mechanism.
  • the limitation should not be understood in the sense that it reduces the number of degrees of freedom of the gear.
  • the working range specified by the gear is the working range that is theoretically possible without the mechanism, the limits of which are determined solely by the mechanical properties of the gear, in particular the dimensions and position of the gear elements.
  • the limited working range is the actual working range in which the work unit can carry out the intended processing of workpieces.
  • Gearboxes are generally known to those skilled in the art. These include, for example, a base and a coupling that are connected to one another by means of rockers.
  • the rockers can each be rigid elements that are connected to the base and the coupling in an articulated manner.
  • the frame forms the base and the working unit forms a coupling of the gearbox.
  • the gear according to the invention is designed in such a way that the working area of the working unit is not limited to a trajectory curve, but is formed by a two-dimensional surface which can lie in a vertical plane, for example.
  • the processing machine is designed as a miter saw, for example, to guide the working unit as desired in this plane - referred to as the cutting plane in a saw - whereby different types of cuts can be carried out, such as purely vertical mitering, mitering with a pulling function or groove cuts.
  • a further advantage is that the functional separation between mitering and pulling is practically imperceptible to the user.
  • the processing machine is also provided with a spring which acts on one of the gear elements on the one hand and on the frame or another of the gear elements on the other.
  • the spring can in particular be a tension spring, for example a helical tension spring or a gas tension spring.
  • the spring acts on the gear box, in particular on the first gear element, and on the frame, on the other hand.
  • the spring characteristics can be influenced in a targeted manner in order to achieve a weaker stretch of the spring at certain swivel angles and thus to make the increase in operating force degressive rather than linear. In this way, the course of the operating force can be positively influenced across the entire working range.
  • the processing machine further comprises a guide unit for restricting the movement of the second joint within a plane of movement orthogonal to the axis of rotation of the second joint.
  • the movement of the second joint which is moved by the operator when the guide unit is moved due to its connection to the working unit, is restricted by the guide unit.
  • this also subjects the movement of the working unit to an additional restriction, i.e. a restriction that occurs in addition to the restriction described above by the mechanism for restricting the working area.
  • this additional restriction can mean that the second joint can only be moved within a rectangular, delimited area, which of course lies in the plane of movement of the second joint.
  • the guide unit has a first linear guide for guiding the second joint in a first direction and a second linear guide for guiding the second joint in a second direction that runs orthogonal to the first direction.
  • first direction can run horizontally and the second direction vertically.
  • the guide unit advantageously has a guide rail, in particular a pantograph guide rail, on which the first linear guide is formed and which is movably guided by the second linear guide.
  • the guide rail itself has the first linear guide, which is in particular horizontal, and is movably guided as a whole, i.e. together with the first linear guide, along the second linear guide, which is in particular vertical.
  • the processing machine can have a guide spring that acts in the second direction, in particular a gas pressure spring, a gas spring or a tension spring, which acts on the frame on the one hand and on the guide unit, in particular on the guide link, on the other hand.
  • a guide spring that acts in the second direction, in particular a gas pressure spring, a gas spring or a tension spring, which acts on the frame on the one hand and on the guide unit, in particular on the guide link, on the other hand.
  • a guide spring that acts in the second direction, in particular a gas pressure spring, a gas spring or a tension spring, which acts on the frame on the one hand and on the guide unit, in particular on the guide link, on the other hand.
  • the first linear guide or the second linear guide has an elongated hole.
  • an elongated hole can be formed on the link as a first linear guide for the second joint.
  • the first linear guide or the second linear guide can be formed on the frame, for example.
  • the frame can have a guide rail that is permanently installed on it and is preferably vertically aligned. Grooves that correspond to the guide rail can be provided on the slide itself or on components attached to it.
  • the slide can be provided with one, two or more recirculating ball carriages that engage the guide rail. The guide rail and the recirculating ball carriages then together form the respective linear guide, in particular the second linear guide.
  • the first linear guide and the second linear guide have a limit to limit the movement of the second joint within the rectangular, demarcated area.
  • the limits can advantageously be provided with soft, damping components.
  • the soft components can also be attached to other components of the guide gear in order to achieve a damping effect in the end positions.
  • the second joint or the end positions of the first linear guide, the second linear guide or the positions of the gear members relative to one another can be provided with soft, damping components. Additional damping effects can be achieved if the spring and/or the guide spring are designed as gas springs. If the processing machine is released by the user in an extended position, this would prevent a rapid and unbraked movement of the processing machine into the starting position due to the pre-tensioned springs.
  • the first gear member can have a receptacle, in particular a hollow chamber, for the spring.
  • the spring can thus be accommodated in the processing machine in a space-saving manner and protected against external influences.
  • the first gear member is provided with a pre-tensioning device for the spring.
  • the pre-tensioning device preferably has an adjustable connection point for the spring.
  • the pre-tensioning device can be designed so that the connection point of the spring can be adjusted via a thread. This is advantageous in order to compensate for manufacturing tolerances of the springs and thus achieve comparable behavior with different springs. In addition, this fine adjustment can be used so that the user can adjust the operating force according to his or her requirements.
  • Fig.1 a schematic side view of an electrical processing machine 10 designed as a crosscut saw or crosscut saw in two different positions.
  • the processing machine 10 has a frame 11 and a work unit 15 with a work tool 13, which in the present embodiment is a saw blade.
  • the work unit 15 is connected to the frame 11 via a gear 17.
  • the gear 17 has a two-stroke and a mechanism for limiting a working range of the work unit 15 predetermined by the two-stroke.
  • the two-stroke comprises a first gear member 19 connected to the frame 11 and a second gear member 21 connected to the first gear member 19 by a gear joint 27.
  • the work unit 15 is fastened to the end of the second gear member 21.
  • the mechanism for limiting the working range of the work unit 15 predetermined by the two-stroke comprises a third gear member 23 and a fourth gear member 25.
  • the third gear member 23 is connected to the first gear member 19 by a first joint 29.
  • the fourth transmission member 25 is connected to the third transmission member 23 by a second joint 31 and to the second transmission member 21 by a third joint 33.
  • This freedom of movement is only limited by the mechanism for restricting the working area specified by the two-stroke in such a way that the working unit 15 cannot reach undesirable positions relative to the frame 11.
  • a processing machine 10 with such a design does not have any forced guidance and would therefore in its rest position, i.e. in a position in which it is not moved or held by the user, due to gravity, the Fig.1
  • the processing machine 10 assumes a different position in the rest position, namely the position shown in Fig.1 shown on the left. This position also corresponds to the position that is usually desired by the user.
  • Fig.1 As can be seen, the possible movement of the second joint 31 between these two positions is indicated by an imaginary rectangle, wherein the two positions according to the desired and the actual rest position correspond to the respective opposite extreme positions of the second joint 31 within this imaginary rectangle.
  • the present invention proposes Fig.2 schematically illustrated springback and damping concept.
  • the processing machine 10 is further provided with a spring 35, which in the present embodiment acts on the frame 11 on the one hand and on the first gear member 19 on the other hand and causes a tension spring force F 1 on the first gear member 19.
  • the spring 35 is designed as a helical tension spring in the present embodiment, but it can also be designed as a gas tension spring, for example.
  • the spring characteristics can be specifically influenced in order to achieve a weaker stretch of the spring at certain swivel angles and thus to make the increase in operating force degressive rather than linear. In this way, the course of the operating force can be positively influenced over the entire working range.
  • the processing machine 10 is also provided with a guide spring 37, in particular a (gas) pressure spring, which causes a spring force F 2 on the second joint 31.
  • a guide spring 37 in particular a (gas) pressure spring, which causes a spring force F 2 on the second joint 31.
  • Fig.3 In order to enable the previously mentioned mobility of the second joint 31 in a rectangular area, Fig.3 There is also a solution in which this mobility is achieved by two linear guides 43, 45.
  • the two linear guides 43, 45 are aligned orthogonally to one another.
  • the first linear guide 43 in the present embodiment extends purely horizontally, and the second linear guide 45 in the present embodiment extends purely vertically.
  • the second linear guide 45 runs vertically, it remains unaffected by a horizontal extension of the working unit 15 by the user. This horizontal extension is a movement typical for a cutting process. As a result, the second linear guide 45 can be moved as shown in Fig.3 As can be seen, the guide spring 37 can be spring-loaded purely vertically to a point fixed to the frame, whereby an optimized operating force curve can be achieved.
  • the first gear member 19 has a joint 27a for the gear joint 27, a joint 29a for the first joint 29 and a joint 11a for the jointed connection of the first gear member 19 to the frame 11.
  • the first gear member 19 is provided with a receptacle 49, which in the present embodiment is designed as a hollow chamber and within which the spring 35 extends, the end 35a of the spring 35 intended for connection to the frame 11 protruding from the receptacle 49. and for example has a bearing bush in order to be connected to the frame 11.
  • connection point 53 is part of a pre-tensioning device 51 and is adjustable in terms of its exact position, for example by means of a thread arrangement, in order to pre-tension the spring 35, in particular in order to compensate for manufacturing tolerances of the spring 35 and to be able to set a desired operating force.
  • a backdrop 41 which is part of a guide unit 39, is shown by way of example in Fig.6 and 7 shown.
  • the guide 41 also referred to as pantograph guide, is approximately L-shaped and is arranged linearly, in the present embodiment vertically, movable on the frame 11.
  • Fig.7 shows a guide rail 55 which is firmly attached to the frame 11 (in Fig.7 not visible).
  • a guide groove 59 is also provided on the slide 41 and two ball bearing carriages 57 are firmly attached, which together with the guide rail 55 form the previously mentioned second linear guide 45 and effect the vertical mobility of the slide 41 relative to the frame 11. In the direction of travel, the mobility is restricted by limitations 47 on the frame 11, see Fig.6 .
  • the second linear guide 45 can also be designed in a different way.
  • the link 41 also has a slotted hole which forms the first linear guide 43 and extends orthogonally to the second linear guide 45. This results in the first linear guide 45 being directed horizontally in the present embodiment.
  • Fig.6 shows, the second joint 31 is guided in the elongated hole.
  • the vertical mobility of the entire link 41 and the first linear guide 43 provided on the link 41 result in a rectangularly delimited area within which the second joint 31 is movable.
  • the processing machine 10 makes it possible due to the arrangement and design the springs 35, 37 to ensure an optimized operating force curve and to automatically assume an end position that complies with standards and is appealing to the user.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Machine Tool Units (AREA)
EP23205957.6A 2022-11-03 2023-10-26 Machine d'usinage électrique Pending EP4364913A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022129084.0A DE102022129084A1 (de) 2022-11-03 2022-11-03 Elektrische Bearbeitungsmaschine

Publications (1)

Publication Number Publication Date
EP4364913A1 true EP4364913A1 (fr) 2024-05-08

Family

ID=88558230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23205957.6A Pending EP4364913A1 (fr) 2022-11-03 2023-10-26 Machine d'usinage électrique

Country Status (2)

Country Link
EP (1) EP4364913A1 (fr)
DE (1) DE102022129084A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE581369C (de) * 1933-07-26 Maschb Leya A G Pendelsaege, deren Saege durch ein Gelenkviereck und eine Fuehrung geradlinig gefuehrt wird
DE691648C (de) * 1938-07-29 1940-06-01 Kirchner & Co Akt Ges Geradlinig gefuehrte Pendelkreissaege

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2616608A1 (de) 1976-04-13 1977-10-27 Johansson Axel Evald W Schneidmaschine
US5257570A (en) 1990-07-16 1993-11-02 Ryobi Limited Circular saw unit
DE4136441C2 (de) 1991-11-06 1996-10-02 Dango & Dienenthal Maschbau Lenksystem zum Ausführen einer geradlinigen horizontalen Vorschubbewegung und einer geradlinigen vertikalen Hubbewegung des Werkzeugträgers eines Manipulier- oder Chargiergerätes
JPH1158302A (ja) 1997-08-11 1999-03-02 Ryobi Ltd 卓上切断機
DE102019129535A1 (de) 2019-10-31 2021-05-06 Mafell Ag Elektrische bearbeitungsmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE581369C (de) * 1933-07-26 Maschb Leya A G Pendelsaege, deren Saege durch ein Gelenkviereck und eine Fuehrung geradlinig gefuehrt wird
DE691648C (de) * 1938-07-29 1940-06-01 Kirchner & Co Akt Ges Geradlinig gefuehrte Pendelkreissaege

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DE102022129084A1 (de) 2024-05-08

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