EP0492033B1 - Getriebevorrichtung für Vorschubrollen, geeignet für automatisch arbeitende Maschinen, insbesondere für Holzkehlmaschinen - Google Patents

Getriebevorrichtung für Vorschubrollen, geeignet für automatisch arbeitende Maschinen, insbesondere für Holzkehlmaschinen Download PDF

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Publication number
EP0492033B1
EP0492033B1 EP19900830620 EP90830620A EP0492033B1 EP 0492033 B1 EP0492033 B1 EP 0492033B1 EP 19900830620 EP19900830620 EP 19900830620 EP 90830620 A EP90830620 A EP 90830620A EP 0492033 B1 EP0492033 B1 EP 0492033B1
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EP
European Patent Office
Prior art keywords
shaft
yoke
worm
back rail
feeding
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.)
Expired - Lifetime
Application number
EP19900830620
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English (en)
French (fr)
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EP0492033A1 (de
Inventor
Fabio Maioli
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SCM SpA
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SCM SpA
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Publication date
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Priority to DE1990605452 priority Critical patent/DE69005452T2/de
Priority to EP19900830620 priority patent/EP0492033B1/de
Publication of EP0492033A1 publication Critical patent/EP0492033A1/de
Application granted granted Critical
Publication of EP0492033B1 publication Critical patent/EP0492033B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27C—PLANING, DRILLING, MILLING, TURNING OR UNIVERSAL MACHINES FOR WOOD OR SIMILAR MATERIAL
    • B27C5/00—Machines designed for producing special profiles or shaped work, e.g. by rotary cutters; Equipment therefor
    • B27C5/02—Machines with table
    • B27C5/06—Arrangements for clamping or feeding work
    • 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
    • B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees
    • B27B25/02—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees with feed and pressure rollers

Definitions

  • the present invention relates to a device by means of which to transmit power to through feed wheels as used in automatic machinery, and more especially in through feed moulders.
  • the art field of automatic woodworking machinery embraces a number of devices for transmitting drive to the friction wheels of through feed machines.
  • Automatic machines of the type in question are equipped conventionally with a system by which the work is transferred from one machining station to the next, propelled along a horizontal bed by feeding wheels that are disposed transversely to the bed and variable for angle and height in relation to the horizontal surface to accommodate different thicknesses of work.
  • Each wheel is keyed onto a supporting shaft coupled to a drive system, and thus rotates together with the shaft.
  • the coupling between the single shaft and the drive system is effected in most instances adopting one of two devices accommodated by a back rail disposed parallel with and to the rear of the horizontal bed.
  • a first such device consists in a yoke associated coaxially with the support shaft and coupled at the end farthest from the wheel to a universal constant velocity joint that allows the variations in height of the feeding wheel above the horizontal bed and connects the supporting shaft to the low speed shaft of a speed reducer.
  • the speed reducer will consist in a conventional train of cylindrical or worm gears, and is connected on the input side to a drive motor.
  • the speed reducer serves to adapt the high angular velocity at the output of the drive motor to the low speed requirement of the feed wheels.
  • the yoke is also hinged to a vertically disposed pneumatic cylinder, through which pressure is applied to the supporting shaft in order to keep the feeding wheel permanently and firmly in contact with the work.
  • the second device is similar in structure to the first, but dissimilar as regards the type of power transmission adopted. In this instance, drive is transmitted to the feeding wheels by a single chain positioned to the rear of the wheels, which extends parallel to the horizontal bed and is connected to the speed reducer of each feed wheel.
  • the coupling in this system consists in two universal joints, synchronized one with the other and interconnected by a flexible element that permits the transmission of drive from the chain to the supporting shaft while allowing variations in angle to accommodate the passage of the work.
  • the first device is encountered normally in automatic machines constructed to high output and efficiency specifications, as drive can be transmitted from the speed reducer to the supporting shaft without subjecting the feeding wheel to sudden acceleration (for example, due to the gear geometry of the speed reducer), any jerkiness being absorbed through the splined coupling of the constant velocity joint.
  • sudden acceleration for example, due to the gear geometry of the speed reducer
  • any jerkiness being absorbed through the splined coupling of the constant velocity joint.
  • the second device is certainly the more economic option, and may be found incorporated into machines of more modest specifications, given its relatively lower efficiency and shorter working life.
  • a chain drive is the poorer option in engineering terms however, as a higher drive ratio is required to give the correct angular velocity at the support shaft, hence a greater number of speed reductions; moreover chain drive is not always acceptable to the users of such machinery.
  • the publication DE-B-1081210 discloses a feeding wheel power transmission device utilizing a transmission means comprising a first shaft disposed parallel to the axis of the feeding wheel and rotatably supporting a yoke; the end of such a first shaft is associated with a worm wheel which is meshed with a worm profile affording at one end of a second transmission vertical shaft mechanically coupled, at its top, to driving means.
  • a third shaft is keyed to the feeding wheel, disposed parallel to the first shaft and supported by the yoke: in this solution the cinematic train between the two shafts (the first and the third ones) is realized by means of a couple of toothed-wheels which arises swinging of the yoke around the axis of the first shaft due to unexpected accelerations of the workpiece: this realizes a not-constant pressure value on the workpiece with consequent work defects.
  • EP-A-203893 refers to a bearing structure with modular sections which can be fitted and separated at will; the transmission from the driving shaft to the driven wheel one is probably realized by means of a traditional couple of toothed-wheels as per the preceeding publication.
  • the object of the present invention is to overcome the drawbacks mentioned above through the adoption of a device that affords economy, and at the same time ensures high operating efficiency by virtue of the engineering expedient adopted in embodiment of the element that ultimately supports the feeding wheel, which ensures that no unnecessary torque is transmitted to the wheel.
  • the feeding station 1 is flanked by a rail 4 extending parallel with and to the rear of the horizontal bed the purpose of which is to carry a set of wheels 5 serving to feed the work 2 horizontally along the bed 3; this same back rail 4 also carries the tools (conventional, and therefore not illustrated) by which the work 2 is machined at further stations of the moulder.
  • the feeding wheels 5 are disposed transversely with respect to the horizontal bed 3 and associated each with means, denoted 6 in their entirety, by which rotation originating at driving means 7 installed behind the rail 4 is transmitted to the wheels 5; such means 6 are accommodated for the most part within or beneath the back rail 4.
  • Transmission means 6 comprise a first cylindrical shaft 8 (fig 2), disposed parallel to the axis of the feeding wheel 5 and rotatably supporting a yoke 9 at two journal points, of which the end positioned farthest from the horizontal bed 3 carries a keyed worm wheel 10 accommodated internally of a support housing 11; to advantage, the housing will be of substantially arched embodiment (see figs 1 and 2) to the end of supporting the first shaft 8 with maximum rigidity.
  • the worm shaft 12 denotes a second transmission shaft accommodated partly by the support housing 11 (figs 2 and 3), which incorporates a worm profile in mesh with the worm wheel 10 of the first transmission shaft 8; in the example of figs 2 and 3, the worm shaft 12 is disposed vertically with one end (the topmost end) projecting from the support housing 11 and carrying two coaxial keyed pulleys 13a and 13b.
  • 14a and 14b denote two belt loops passed around the respective pulleys 13a and 13b, of which the first also passes around an expanding pulley 20 keyed to the driving means 7 behind the back rail 4 and the second around the corresponding pulley of a further second shaft constituting part of the transmission means 6 for a successive feeding wheel; in this way, drive is relayed to all the wheels 5 constituting the feeding station 1 (as discernible from fig 1).
  • the feeding wheel 5 is keyed to and rotatable about the axis of a third shaft 15, carried by the yoke 9 in a position parallel to the first shaft 8 (see fig 2), which is coupled to and driven from the first shaft 8 by way of an idle gear 16 supported rotatably by the yoke 9 in a substantially central position, between the two shafts 8 and 15; meshing contact occurs by way of gears 8a and 15a keyed to the respective shafts in alignment with the idle gear 16.
  • the first and third shafts 8 and 15 are caused to rotate in the same direction, and the resulting mechanical linkage is capable of eliminating unwanted rotational forces transmitted through the assembly 6.
  • the device further comprises means denoted 17 in their entirety, by which to select a degree of rocking movement allowed to the yoke 9 about the axis of the first shaft 8 (see arrow F) during passage of the work 2 beneath the feed wheel 5.
  • such means 17 comprise a bifurcated pin projecting toward the back rail 4 and associated with the part of the yoke 9 occupied by the first shaft 8, which serves to establish the lower limit of the arc of rotation allowed to the yoke 9, and a second pin 21, located alongside the bifurcated pin 17 and nearer to the outermost end of the first shaft 8, extending likewise toward the rail 4, which is set at angle and height different to those of the bifurcated pin 17 (in relation to the horizontal bed 3), and positioned to enter into contact with the bottom face of the back rail 4, thereby establishing the upper limit of the arc of rotation allowed to the yoke 9.
  • the bifurcated pin 17 serves to determine a maximum descent angle of the yoke 9 in relation to the horizontal bed 3, by striking against the stop collar 23, while the second pin 21 establishes a maximum ascent angle by striking against the rail 4.
  • 19 denotes a small, vertically disposed hydraulic cylinder rigidly associated with the support housing 11, of which the reciprocating end impinges on the part of the yoke 9 occupied by the third shaft 15 (a trunnion type connection might also be used if appropriate).
  • the cylinder 19 is adjustable, and serves to keep the wheel 5 steadily in contact with the work 2 during its passage, avoiding any possible slippage (due, for example, to irregularities in the surface of the workpiece).
  • a device As discernible from the foregoing description, the operation of a device according to the invention will occur substantially in this manner: power is supplied to the driving means 7 (depicted in fig 1 as a motor mounted to the back rail 4, and keyed to its spindle, the expanding pulley 20 which permits of varying the input speed), whereupon rotation is transmitted by the belt 14a to the pulley 13a of the first worm shaft 12 (or indeed to any one of the linked worm shafts), and relayed by way of the individual linked pulleys 13a and belt loops 14b to all remaining worm shafts 12; drive is transmitted by each worm shaft 12 to the corresponding worm wheel 10 and the keyed first shaft 8, thence by way of the idle gear 16 to the third shaft 15.
  • the driving means 7 shown in fig 1 as a motor mounted to the back rail 4, and keyed to its spindle, the expanding pulley 20 which permits of varying the input speed
  • rotation is transmitted by the belt 14a to the pulley 13a of the
  • the feed wheel 5 is thus set in rotation, and, engaging each workpiece 2 fed forward by the wheels of preceding stations, adapts to the thickness of the wood by virtue of the angle of the yoke 9 while remaining firmly in contact with the work 2 as the result of pressure applied through the yoke by the hydraulic cylinder 19.
  • Sliding movement of the work 2 along the horizontal bed 3 can be optimized further by elongating the worm shaft 12 down beyond the support housing 11 and below the horizontal bed 3 to permit of meshing with a second worm wheel 10'.
  • a structure below the bed 3 similar to that above (as illustrated schematically by the phantom lines of fig 4), comprising yoke 9', transmission shafts 8' and 15', housing 11' and feed wheel 5', all driven synchronously by the one shaft 12.
  • the bottom yoke 9' will be subject to respective travel limiting means 17' and 21' allowing the wheel 5' a degree of rocking movement such as will ensure continuous contact with the work 2 above.
  • the second transmission shaft or worm shaft is horizontally disposed above the first shaft 8, parallel with the bed 3 and in mesh with a worm wheel 110 occupying the vertical plane directly beneath.
  • the worm wheel 110 is keyed coaxially to an intermediate gear 31 of smaller diameter located between and in mesh with a pair of gears denoted 110a, each keyed in turn to a relative first shaft 8; to advantage, the entire train comprising worm shaft 112, worm wheel 110, intermediate gear 31 and driven gears 110a will be accommodated internally of a removable support housing 111 carrying two first shafts 8 and two feed wheels 5.
  • the worm shaft 112 is fitted at its opposite ends with respective flexible couplings 32a and 32b emerging from the housing 111, which permit of connecting the shaft permanently in rotation both to the power shaft 33 of driving means 7 (e.g. a geared motor not illustrated in the drawings), and to the worm shafts 112 of successive and preceding housings 111.
  • driving means 7 e.g. a geared motor not illustrated in the drawings
  • each housing 111 easily replaceable if need be, carries two drive shafts with two corresponding feeding wheels as a modular assembly.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Gear Transmission (AREA)

Claims (6)

  1. Getriebevorrichtung für Vorschubrollen, geeignet für automatisch arbeitende Maschinen, insbeondere für Holzkehlmaschinen, enthaltend wenigstens eine Vorschubstation (1), durch welche das Werkstück (2) entlang eines horizontalen Bettes (3) vorgeschoben wird, flankiert von einem Querbalken (4), der sich parallel zu dem Bett erstreckt und eine Anzahl von Vorschubrollen (5) trägt, die sich um Achsen drehen, welche quer zu dem Bett angeordnet sind, wobei jede der genannten Vorschubrollen (5) durch Übertragungsmittel (6) des Querbalkens, die in dem Querbalken angeordnet sind, an Antriebsmittel (7) angeschlossen ist, die sich im rückwärtigen Teil des Querbalkens befinden, wobei jedes der Übertragungsmittel (6) wie folgt enthält:
    - ein Trägergehäuse (11, 111), das eine erste Welle (8) aufnimmt, angeordnet parallel zu der Achse der Vorschubrolle (5) und drehbar ein Joch (9) tragend, wobei das Ende der ersten Welle, das sich am weitesten von dem horizontalen Bett (3) entfernt befindet und dem Querbalken (4) zugewandt ist, mit einem Schneckenrad (10) verbunden ist;
    - eine zweite Übertragungswelle (12, 112), die an einem Ende ein Schneckenprofil aufweist, das in das Schneckenrad (10, 110) greift, angeordnet in dem Trägergehäuse (11, 111) und mit dem anderen Ende mechanisch an die Antriebsmittel (7) angeschlossen, und zwar auf solche Weise, dass die Umdrehung von den Antriebsmitteln (7) auf die erste Welle (8) mit einem hohen Geschwindigkeits-Reduzierverhältnis übertragen wird;
    - eine dritte Welle (15), aufgekeilt auf die Vorschubrolle (5), angeordnet parallel zu der ersten Welle (8) und getragen durch das Joch (9);
    dadurch gekennzeichnet, dass sie wie folgt enthält:
    - ein in einer mittleren Position von dem Joch (9) getragenes Leerrad (16), das zwischen den Zahnrädern (8a, 15a), die jeweils auf die erste und die dritte Welle (8, 15) aufgekeilt sind, angeordnet ist und sich mit diesen im Eingriff befindet, und zwar auf solche Weise, dass die Übertragung der Umdrehung von der ersten Welle (8) auf die dritte Welle (15) über eine kinematische Kette erlaubt wird, welche in der Lage ist, die winkelmässig erzeugten Vektorkräfte zu annullieren, die auf die beiden Wellen wirken.
  2. Vorrichtung nach Patentanspruch 1, dadurch gekenn zeichnet, dass die zweite Welle oder Schneckenwelle (12), im Eingriff mit dem Schneckenrad (10), vertikal und rechtwinklig zu der ersten Welle (8) angeordnet ist, sich mit dem oberen Ende nach oben hin erstreckend, um wenigstens eine koaxial aufgekeilte Riemenscheibe (13a) zu tragen, um welche Riemenmittel (14a) laufen, die mit den Antriebsmitteln (7) verbunden sind, und zwar auf solche Weise, dass die Übertragung der Umdrehung von den Antriebsmitteln auf die erste Welle (8) mit einem hohen Geschwindigkeits-Reduzierverhältnis möglich ist, sowie eine zweite koaxial aufgekeilte Riemenscheibe (13b), um welche weitere Riemenmittel (14b) laufen, die mit der Schneckenwelle (12) einer anschliessenden oder vorhergehenden Vorschubrolle (5) verbunden sind.
  3. Vorrichtung nach Patentanspruch 1, dadurch gekenn zeichnet, dass das Joch (9) in der Lage ist, im Verhältnis zu dem horizontalen Bett (3) um die Achse der ersten Welle (8) zu schwingen, und zwar innerhalb eines bestimmten Umdrehungsbogens, der durch Steuermittel begrenzt wird, welche einen Gabelzapfen (17) enthalten, der aussen dem Teil des Joches zugeordnet ist, der durch die erste Welle (8) belegt wird und sich zu dem Querbalken (4) hin auf solche Weise erstreckt, dass er mit einstellbaren Hubbegrenzern (18) zusammenwirkt, die dem Trägergehäuse (11) zugeordnet und ausgerichtet zu dem Gabelzapfen (17) angeordnet sind, um die untere Grenze des erlaubten Umdrehungsbogens für das Joch (9) festzulegen.
  4. Vorrichtung nach Patentanspruch 1, dadurch gekenn zeichnet, dass sie einen vertikal angeordneten Hydraulikzylinder (19) enthält, der auf dem Querbalken (4) montiert ist und auf das Ende des Joches (9) wirkt, das am weitesten von der ersten Welle (8) entfernt ist, und dessen Zweck es ist, die Vorschubrolle (5) in ununterbrochenem Kontakt mit dem Werkstück (2) zu halten.
  5. Vorrichtung nach Patentanspruch 2, enthaltend eine untere erste Welle (8'), eine untere dritte Welle (15') und ein unteres Joch (9'), welche untere Übertragungsmittel gleich den Übertragungsmitteln (6) beschreiben, die oberhalb des horizontalen Bettes (3) angeordnet sind, dadurch gekennzeichnet, dass die zweite Welle oder Schneckenwelle (12) sich ausserhalb auf und über das Trägergehäuse (11) erstreckt und unter dem horizontalen Bett (3), und zwar auf solche Weise, dass sie in das untere Schneckenrad (10') greift, welches einen Teil der genannten unteren Übertragungsmittel bildet.
  6. Vorrichtung nach Patentanspruch 3, dadurch gekenn zeichnet, dass die genannten Steuermittel weiter einen zweiten Zapfen (21) enthalten, der dem Joch zugeordnet und längs des Gabelzapfens (17) positioniert ist und sich zu dem Querbalken (4) hin erstreckt, und der von einer solchen Länge ist, dass die obere Grenze des erlaubten Umdrehungsbogens des Joches festgelegt wird, wenn er an der unteren Fläche des Querbalkens (4) anschlägt.
EP19900830620 1990-12-28 1990-12-28 Getriebevorrichtung für Vorschubrollen, geeignet für automatisch arbeitende Maschinen, insbesondere für Holzkehlmaschinen Expired - Lifetime EP0492033B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1990605452 DE69005452T2 (de) 1990-12-28 1990-12-28 Getriebevorrichtung für Vorschubrollen, geeignet für automatisch arbeitende Maschinen, insbesondere für Holzkehlmaschinen.
EP19900830620 EP0492033B1 (de) 1990-12-28 1990-12-28 Getriebevorrichtung für Vorschubrollen, geeignet für automatisch arbeitende Maschinen, insbesondere für Holzkehlmaschinen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19900830620 EP0492033B1 (de) 1990-12-28 1990-12-28 Getriebevorrichtung für Vorschubrollen, geeignet für automatisch arbeitende Maschinen, insbesondere für Holzkehlmaschinen

Publications (2)

Publication Number Publication Date
EP0492033A1 EP0492033A1 (de) 1992-07-01
EP0492033B1 true EP0492033B1 (de) 1993-12-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900830620 Expired - Lifetime EP0492033B1 (de) 1990-12-28 1990-12-28 Getriebevorrichtung für Vorschubrollen, geeignet für automatisch arbeitende Maschinen, insbesondere für Holzkehlmaschinen

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EP (1) EP0492033B1 (de)
DE (1) DE69005452T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111496314A (zh) * 2020-03-30 2020-08-07 白路英 一种用于金属切割机刀片可换式旋转刀具

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE514678C (de) * 1929-07-13 1930-12-15 Siemens Schuckertwerke Akt Ges Anordnung an Holzbearbeitungsmaschinen mit Vorschubwalzen
DE1081210B (de) * 1956-08-16 1960-05-05 Reich Maschf Gmbh Karl Vorschubeinrichtung fuer Holzbearbeitungsmaschinen
FR1206083A (fr) * 1958-05-07 1960-02-08 Dispositif d'entraînement, notamment pour machines à travailler le bois
DE3105083C2 (de) * 1981-02-12 1983-06-30 Okoma Maschinenfabrik Gmbh, 7082 Oberkochen "Vorschubeinrichtung für Holzbearbeitungsmaschinen"
EP0130948A1 (de) * 1983-05-06 1985-01-09 SCHIAVI CENTRO LAVORAZIONI MECCANICHE S.p.A. Schwingfähige Kraftübertragungseinheit für Werkstückvorschubrollen bei Holzbearbeitungsmaschinen
IT8504900V0 (it) * 1985-05-15 1985-05-15 Samco Ind Spa Trascinatore modulare applicabile a macchine per la lavorazione del legno
IT216026Z2 (it) * 1988-12-14 1991-04-26 Pertici S P A Trascinatore a rulli di avanzamentocon trasmissione ad organi flessibili

Also Published As

Publication number Publication date
DE69005452T2 (de) 1994-04-14
DE69005452D1 (de) 1994-02-03
EP0492033A1 (de) 1992-07-01

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