EP4173784A1 - Äusserst vielseitig verwendbare nageleinheit für nagelmaschinen, insbesondere zum nageln von holzelementen auf mehreren schichten - Google Patents

Äusserst vielseitig verwendbare nageleinheit für nagelmaschinen, insbesondere zum nageln von holzelementen auf mehreren schichten Download PDF

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Publication number
EP4173784A1
EP4173784A1 EP22194805.2A EP22194805A EP4173784A1 EP 4173784 A1 EP4173784 A1 EP 4173784A1 EP 22194805 A EP22194805 A EP 22194805A EP 4173784 A1 EP4173784 A1 EP 4173784A1
Authority
EP
European Patent Office
Prior art keywords
nailing
clamp
plunger
unit
nail
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
EP22194805.2A
Other languages
English (en)
French (fr)
Inventor
Giuseppe Trovenzi
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.)
Corali SpA
Original Assignee
Corali SpA
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 Corali SpA filed Critical Corali SpA
Publication of EP4173784A1 publication Critical patent/EP4173784A1/de
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
    • B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
    • B27F7/00—Nailing or stapling; Nailed or stapled work
    • B27F7/02—Nailing machines
    • B27F7/025—Nailing machines for inserting joint-nails

Definitions

  • the present invention relates to a nailing unit for nailing machines, particularly for nailing wood elements on multiple layers, useful in practice particularly for performing the nailing of wood beams formed by two or more layers.
  • machines for nailing wood beams on multiple layers comprise, in addition to a lower fixture for managing the movement and retention in position of the wood beams, an upper nailing unit, which is the subject matter of the present invention.
  • the resting surface of the clamp which corresponds to the upper face of the upper wood piece to be nailed, must be fixed. This means that as the thickness of the elements to be nailed (i.e., of the wood pieces that compose the beam) varies, so must the position of the resting surface of the element to be nailed (where the lower wood piece of the beam rests) that is the loading surface on which the operator, or the automatic feeding mechanism, deposits the elements to be nailed. Nailing machines therefore have systems for adjusting the height of the entire loading and unloading region of the machine in order to adapt to the variability of the thickness of the woods pieces to be nailed.
  • nailing units of the known type have the disadvantage that they can be used only in nailing machines provided with systems for adjusting the height of the loading region (in particular of the resting surface), which disadvantageously increase the space occupation, complexity and costs of the machine.
  • the aim of the present invention is to overcome the limitations of the background art described above by providing a nailing unit for nailing machines that can be used in machines not provided with a system for adjusting the height of the resting surface, i.e., with a fixed resting surface.
  • an object of the present invention is to provide a nailing unit for nailing machines that is more versatile than the background art.
  • Another object of the invention is to provide a nailing unit for nailing machines that is precise and reliable.
  • a further object of the invention is to provide a nailing unit for nailing machines that is easy to provide and economically competitive.
  • the nailing unit designated generally by the reference numeral 1 or 1' depending on the embodiment, is adapted to be installed and used in nailing machines, particularly for nailing wood elements on multiple layers (such as for example beams composed of two or more layers of wood which must be nailed to each other), above a resting surface for the elements to be nailed.
  • the resting surface of the nailing machine is substantially horizontal and the nailing unit is positioned so that its working axis is perpendicular to the resting surface.
  • vertical is understood to indicate vertical when the nailing unit 1, 1' is in the active position for use, i.e., substantially perpendicular to the resting surface when the nailing unit is installed in the active configuration in a machine, or in any case substantially perpendicular to the resting surface of the machine when installed therein.
  • the nailing unit 1, 1' comprises a clamp 40, or clamp assembly, which is adapted to keep a nail C in the nailing position above an element to be nailed and a plunger 30 adapted to push the nail C in order to make it penetrate into the element to be nailed.
  • the clamp 40 comprises at least one system 49 for receiving the nail C, which, in a known manner, is configured to accommodate the nail C so as to release it, when pushed by the plunger 30, allowing its sliding and its exit from the clamp downward.
  • the nailing unit 1, 1' comprises an actuator 20, 120, and more precisely a linear actuator (in the sense that it is of the type that induces a movement along a straight line), which comprises a pusher element 21, 121 (such as a stem or shaft or piston or the like) which moves along a vertical rectilinear direction.
  • a linear actuator in the sense that it is of the type that induces a movement along a straight line
  • a pusher element 21, 121 such as a stem or shaft or piston or the like
  • the actuator is an electric linear actuator 120, in which the pusher element 121 is a shaft or stem which is actuated electrically to move along the axis of the actuator 120; in other embodiments, such as the one of Figures 1-4 , the actuator is a hydraulic actuator 20 (such as a hydraulic cylinder), in which the pusher element 21 is a stem or piston which is actuated hydraulically to move along the axis of the actuator.
  • the actuator is a hydraulic actuator 20 (such as a hydraulic cylinder), in which the pusher element 21 is a stem or piston which is actuated hydraulically to move along the axis of the actuator.
  • the pusher element 21, 121 is integral with the plunger 30 and also with a traction rod 51, which also is vertical and is provided with a lower locking element 55.
  • the plunger 30 is fixed mechanically to one end of the pusher element 21, 121 so that said element, by moving, pushes or pulls the plunger 30 along said vertical rectilinear direction.
  • the pusher element 21, 121 is provided, at a distal end (the end that is closest to the clamp 40), with at least one mechanical fixing element 22, 122, which comprises for example one or more jaws or other devices adapted to engage, or in any case fix, mechanically the plunger 30 and the traction rod to the pusher element 21, 121.
  • the plunger 30 and the traction rod 51 can in any case be fixed to the pusher element 21, 121 by means of any known fixing method.
  • the clamp 40 can slide freely along the traction rod 51 to a lower stroke limit position in which it is prevented from moving further downward by the locking element 55 (as can be seen in Figures 1 and 5 ), the clamp 40 being in practice suspended from the traction rod 51 when the rod is raised.
  • the locking element 55 is a (preferably annular) shoulder that is present on the traction rod 51 and is formed for example by a ring which is keyed on the rod 51, said annular shoulder 55 being configured to block the downward movement of an abutment surface which is integral with the clamp 40.
  • the abutment surface is for example a lower surface of a ring 45, or other sliding element, which can slide along the sliding rod 51, such ring 45 or other sliding element being rigidly coupled to the clamp 40 (for example being fixed to the plate 44, which will be described hereinafter, which in turn is fixed to the clamp 40); in this case, therefore, the shoulder or other locking element 55 blocks the downward sliding of the ring 45 or other sliding element which is integral with the clamp 40.
  • the clamp 40 comprises a through vertical tunnel 48 (i.e., any opening or passage) in which the plunger 30 can slide until it reaches the nail C when it is held in the nailing position by the clamp 40 and therefore push it by virtue of the action of the force imparted by the linear actuator 20, 120 (by means of the pusher element 21, 121) to the plunger 30, making the nail C exit downward from the seat of the clamp 40.
  • a through vertical tunnel 48 i.e., any opening or passage
  • the nailing unit 1, 1' can be configured in an inactive condition (which is the one in which it is before performing nailing), visible in Figures 1 and 5 , in which the clamp 40 is raised with respect to the nailing position and in which the plunger 30 is higher than the clamp 40.
  • the clamp 40 and the plunger 30 are both slidingly coupled (directly or preferably indirectly) to a same vertical sliding guide 60 which constrains their movements parallel to it; this solution ensures optimum alignment of the two elements (the clamp 40 and the plunger 30) and is advantageous from the point of view of space occupation.
  • the clamp 40 is coupled to the sliding guide 60 at least by means of a slider 43, which can slide along said sliding guide 60, and preferably the clamp 40 is connected to the slider 60 by means of a plate 44 which is integral both with the clamp 40 and with the slider 43.
  • the plunger 30 also is coupled indirectly to the sliding guide 60 at least by means of a slider of the pusher element 33, which can slide along the sliding guide 60 and is rigidly coupled to the pusher element 21, 121, preferably by means of at least one interposed plate 34.
  • the plunger 30 is rigidly coupled to the pusher element 21, 121, which, by means of the plate 34, is coupled to the slider of the pusher element 33.
  • the nailing unit 1, 1' comprises a supporting structure 80, 180, which supports directly or indirectly all the elements described so far.
  • the supporting structure 180 comprises protective side walls which are positioned so as to protect at least partially at least the actuator 20, 120.
  • the supporting structure 180 comprises a rear wall 81, 181 which is optionally configured to fix the nailing unit 1, 1' to the structure of a nailing machine.
  • the sliding guide 60 is fixed to an internal face of said rear wall 81, 181.
  • the nailing unit 1, 1' is provided with, or can be functionally connected to, a programmable electronic control unit, for example of the type of a programmable logic controller (PLC), which controls the operation of the actuator 20, 120 by sending a nailing signal as a consequence of which the actuator 20, 120 moves downward the pusher element 21, 121, inducing the downward movement of the clamp 40 and of the plunger 30; the clamp 40 stops when it encounters the surface of the element to be nailed and the plunger 30 continues the movement, as described above, pushing the nail C and performing the nailing.
  • PLC programmable logic controller
  • the same electronic control unit induces the actuator 20, 120 to reverse the motion of the pusher element 21, 121 when the nail C has completely penetrated into the element to be nailed, thus lifting initially the plunger 30 and then also the clamp 40.
  • the resting surface of the nailing machine in which the nailing unit 1, 1' according to the invention is used can be kept fixed, since the movements of the clamp 40 and of the nail C and of the plunger 30 adapt to the thickness of the elements to be nailed.
  • the linear actuator is a hydraulic actuator 20 which comprises a hydraulic cylinder and a stem which constitutes the pusher element 21 and is pushed by the action of a fluid (preferably oil) that is present in the hydraulic cylinder.
  • a fluid preferably oil
  • the nailing unit 1 comprises a system for control and adjustment of the temperature of the fluid of the hydraulic actuator 20 which is configured to maintain the temperature of said fluid within a preset interval; this temperature control and adjustment system comprises at least one temperature sensor.
  • this temperature control and adjustment system comprises at least one temperature sensor.
  • the nailing unit 1 preferably also comprises a position sensor (which comprises for example a proximity sensor), which is configured to detect the position of the nail C with respect to the element to be nailed or, even more preferably, to detect the position of the plunger 30 with respect to the clamp 40; in this case, the programmable electronic control unit controls the linear actuator 20 as a function of the position detected by the position sensor, i.e., it induces the reversal of the motion of the pusher element 21 when a preset position of the plunger 30 with respect to the clamp 40 (or of the nail C with respect to the element to be nailed) that is indicative of the complete penetration of the nail C is detected.
  • a position sensor which comprises for example a proximity sensor
  • the programmable electronic control unit controls the linear actuator 20 as a function of the position detected by the position sensor, i.e., it induces the reversal of the motion of the pusher element 21 when a preset position of the plunger 30 with respect to the clamp 40 (or of the nail C
  • this embodiment it is preferable to perform a preliminary calibration step in order to identify the optimum position to be detected in order to send the motion reversal signal, for the specific type of element to be nailed, optionally setting in the electronic control unit a delay time and/or varying the position of the sensor.
  • the linear actuator is an electric linear actuator 120.
  • the electric linear actuator comprises a linear axis actuator 120 (i.e., an actuator of the type known as linear electric shaft) which is driven by a brushless electric motor 129, which is functionally connected to the electronic control unit that controls its movement; in this embodiment, the pusher element 121 is the linearly sliding shaft of the linear electric shaft 120.
  • a linear axis actuator 120 i.e., an actuator of the type known as linear electric shaft
  • the pusher element 121 is the linearly sliding shaft of the linear electric shaft 120.
  • the electric linear actuator 120 is appropriately sized so as to ensure the force necessary for nailing, but it can also be provided with a torque control system which allows to limit the force if a force that exceeds the expected one is required (for example due to improper use of the machine).
  • the electric linear actuator 120 thus provided allows to control speed and acceleration both during descent and during ascent.
  • the electric linear actuator 120 thus provided allows to stop the plunger 30 exactly at the desired height, regardless of the diameter of the nail C, of the penetration length, and of the hardness of the wood.
  • Embodiments are not excluded in which the actuator 20, 120 is an electrical linear actuator 120 and in which there is in any case also the position sensor.
  • the nailing unit according to the present invention achieves the intended aim and objects, since it can be used in machines not provided with a system for adjusting the height of the resting surface, i.e., with a fixed resting surface.
  • Another advantage of the nailing unit according to the invention resides in that it is more versatile than the background art.
  • a further advantage of the nailing unit according to the invention resides in that it is precise and reliable.
  • Another advantage of the nailing unit according to the invention resides in that it is easy to provide and economically competitive.
  • the materials used may be any according to the requirements and the state of the art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP22194805.2A 2021-10-20 2022-09-09 Äusserst vielseitig verwendbare nageleinheit für nagelmaschinen, insbesondere zum nageln von holzelementen auf mehreren schichten Pending EP4173784A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202100026903 2021-10-20

Publications (1)

Publication Number Publication Date
EP4173784A1 true EP4173784A1 (de) 2023-05-03

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Application Number Title Priority Date Filing Date
EP22194805.2A Pending EP4173784A1 (de) 2021-10-20 2022-09-09 Äusserst vielseitig verwendbare nageleinheit für nagelmaschinen, insbesondere zum nageln von holzelementen auf mehreren schichten

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EP (1) EP4173784A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4782989A (en) * 1987-08-17 1988-11-08 Viking Engineering & Development, Inc. Compensating nail-driving chuck for pallet-making machine
US5191840A (en) * 1991-09-11 1993-03-09 Oak Industries, Inc. Spike driving machine having pushing and percussive spike driving functions
EP2383085A1 (de) * 2010-04-30 2011-11-02 Swans Mekaniska Verkstad I Gagnef AB Maschine zum Eintreiben von Befestigungsmitteln in Werkstücke
US10661470B2 (en) * 2017-05-19 2020-05-26 Joh. Friedrich Behrens Ag Driving tool for driving fastening means into workpieces

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4782989A (en) * 1987-08-17 1988-11-08 Viking Engineering & Development, Inc. Compensating nail-driving chuck for pallet-making machine
US5191840A (en) * 1991-09-11 1993-03-09 Oak Industries, Inc. Spike driving machine having pushing and percussive spike driving functions
EP2383085A1 (de) * 2010-04-30 2011-11-02 Swans Mekaniska Verkstad I Gagnef AB Maschine zum Eintreiben von Befestigungsmitteln in Werkstücke
US10661470B2 (en) * 2017-05-19 2020-05-26 Joh. Friedrich Behrens Ag Driving tool for driving fastening means into workpieces

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