EP0994032B1 - Unité d'entraînement à sécurité en combinaison avec un écran de protection, notamment pour des machines de fabrication - Google Patents

Unité d'entraînement à sécurité en combinaison avec un écran de protection, notamment pour des machines de fabrication Download PDF

Info

Publication number
EP0994032B1
EP0994032B1 EP99120332A EP99120332A EP0994032B1 EP 0994032 B1 EP0994032 B1 EP 0994032B1 EP 99120332 A EP99120332 A EP 99120332A EP 99120332 A EP99120332 A EP 99120332A EP 0994032 B1 EP0994032 B1 EP 0994032B1
Authority
EP
European Patent Office
Prior art keywords
drive unit
gear
helical
fact
unit according
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
EP99120332A
Other languages
German (de)
English (en)
Other versions
EP0994032A1 (fr
Inventor
Valter Spada
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.)
SASIB SpA Bologna
Original Assignee
SASIB SpA Bologna
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 SASIB SpA Bologna filed Critical SASIB SpA Bologna
Publication of EP0994032A1 publication Critical patent/EP0994032A1/fr
Application granted granted Critical
Publication of EP0994032B1 publication Critical patent/EP0994032B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/005—Safety-devices

Definitions

  • the invention relates to a safety drive unit in combination with a movable protection screen, particularly in manufacturing machines, the said unit comprising at least one drive motor connected with the protection screen by a mechanical transmission.
  • protection screens in particular in the automatic manufacturing machines are at present of great importance for the protection against accidents of the operators, as well as for the screening of the noise produced by the machines themselves.
  • This entails the necessity of constructing protection screens as for example guards that are always more sturdy, ergonomically integrated with the machine, that have to be easily and rapidly moved from the position of closure to the one of opening.
  • the attempt to satisfy all these requirements has lead to noticeable increase in weight and to avoid the use of elements of protection of a traditional sash type, for making the same in form of covers that can be raised and lowered.
  • the protection screens are in the form of angled covers or angled walls that extend themselves in the closed position in such a manner as to cover the front side of the machine as well as the top one, thus substantially completely separating towards the outside the accessible sides of the working units of the machine.
  • these protection screens are restrained in a moveable manner to a support structure of the machine by means of supports in form of an articulated quadrilateral, of a substantially trapezoidal shape in particular a rectangular trapeze.
  • the protection screens are notably heavy and require therefore means that effectively prevent a return of the same to the lowered position of closure when they are taken to the open position for access to the working units of the machine.
  • the invention has the scope of perfecting a safety drive unit in combination with a movable protection screen of the type described at the beginning in such a manner whereby intervention of the operator is not necessary to ensure the locking in the raised position of the screens themselves and thus avoiding also the use of mechanisms external to the transmission also if of an automatic type, the whole thanks to relative simple and low cost means relative to the traditional automatic means and allowing a great resistance of selflocking and of transmission.
  • a twinworm gear in itself constructively realised as indicated in the above feature a) is known for example from a previous publication of the inventor B. Popper of the Nicholas Chironis Associate Editor and is based substantially on the pitch difference between the two helical gears. Eventually also the diameters can be different contributing to obtain a preestablished transmission ratio.
  • the two symmetrical threads are distanced by an intermediate section without thread.
  • the output shaft that is integral rotary wise with the driven gear drives the threaded rod of a further transmission formed by a threaded rod and a screwed nut gear and which further transmission drives in its turn the protection screen.
  • the drive shaft on which the drive gear is fitted is laterally offset relative to the driven shaft and two separate motors are connected to the drive shaft each of which is connected rotary wise to one of the two opposite ends of said drive shaft.
  • one of the two motors consists of an electric motor and is the main motor, whereas the other motor is the emergency motor and consists preferably of a motor of the pneumatic type.
  • the safety drive unit apart from offering in a simple and automatic manner the locking in any position of lifting of the screen driven by the same allows also the activation in case of a breakdown of the main motor or lack of electrical power. Furthermore such unit is constructively of very limited dimensions and avoids problems of encumbrance, whereas it can be mounted in an analogous manner to any known linear actuator, also in an articulated manner to its two opposite ends of the box of the unit and of the nut sliding on the threaded rod.
  • a transmission shaft is provided with a radial arm to which a second axis is articulated in an oscillating manner according to an axis parallel to the transmission shaft in form of a threaded nut sliding on a threaded rod, whereas the transmission box is articulated to an additional part of the support structure of the machine in manner oscillating around an axis parallel to the axis of articulation of the threaded nut.
  • a machine according to the invention in particular a machine for processing tobacco and more specifically a machine for packing cigarettes has a support bed of the individual manufacturing units made in shape of a table 1.
  • This framework in form of a table 1 is of the type for example described in the patent EP816714 of the sameoxy.
  • the manufacturing units, the transmission units and the drive units are made prefabricated each in form of an independent modular element with an own support structure or box, which is provided with preestablished mounting means to, on or inside the framework in form of a table.
  • the machine according to the invention has at least one channel, in particular two channels of distribution of the cables, conduits or other lines of supply, of control or for other functions.
  • This or these channels 2, 3 extend themselves advantageously in a position of non interference and in a preferential manner along the rear longitudinal side of the machine, in special manner in a position on top, or in any case in the area of the maximum top encumbrance of the machine.
  • the channels of distribution 2, 3 are supported in this case by risers 4 that are provided in pairs on the opposite side ends of each module 101, 201, 301 of the framework in form of a table 1. Therefore adjacent modules 101, 201, 301 have also adjacent risers 4.
  • a removable cover 5 is mounted to a longitudinal beam that is segmented substantially corresponding to the modular segments of the channels 2, 3 and is parallel to the channel or channels 2, 3 themselves and extends itself substantially at the level of said channels, or that is advantageously formed by the same channels 2, 3. Also this cover 5 is made modular, or is formed by individual segments of covers that complete themselves in order to form a single cover and that are divided between each other in a manner corresponding to the modules 101, 201, 301 of the framework in form of a table 1. Each module 101, 201, 301 of the framework in form of a table 1 has therefore its part of the cover 205. This can also be previously mounted to the corresponding part of the beam or channel 201, 301, 202, 302, 103, 303, before the reciprocal assembly of the modules 101,201, 301 of the framework in form of a bed 1.
  • the said cover 5 and the corresponding modules are made with a shape substantially in form of a L with a branch 305 substantially horizontal and above that covers the machine on top and a vertical branch 405 that covers the front part and that can extend itself up to the level of the plane of the modules 101, 201, 301 of the framework in form of a table 1, or if necessary down to the ground.
  • the individual modules of the protection screens or of the cover 205 are formed in two parts, that is a top part separated from the vertical or substantially vertical part designed to overlap on the front side and that is mounted in a removable manner to the top part.
  • the said front part substantially vertical is not illustrated to allow for a better view of the additional constructive elements.
  • the segments of the protection cover are fitted to the corresponding segment of the beam or channel 103, 203, 303, in a manner folding upwards.
  • the segments 205 of the cover are supported cantilevered from the front of the segment of the beam of the channel 103, 203, 303 and are articulated in an oscillating manner around an horizontal axis.
  • the segments 205 of the cover do not exceed the total space in height defined by the top side of the channel 2, 3.
  • the segments of the cover 205 are articulated cantilevered from the front side of the segment of the beam or of the modular segment of the channel 103, 203, 303 thanks to a device of articulation in form of an articulated parallelogram, in particular an articulated trapeze that is illustrated with regards the constructive detail in Fig. 4 and that is illustrated schematically in Figs. 7 to 9.
  • Said articulated trapeze is overall indicated with 7 and that has a mounting plate 107 supported cantilevered by pairs of arms of articulation 207, 307 provided on each front of the plate 107 and articulated respectively in correspondence to the front edge and the rear one of the said plate 107, whereas the opposite extremity of the two arms 207, 307 are articulated in vertical points distanced 407, 507 at the front side of the corresponding segment of the beam of the channel 103, 203, 303.
  • the movement of opening and closure can be obtained in different ways, for example by means of linear actuators or other traditional drive units.
  • a transversal section of a module 101, 201, 301 of the framework in form of a table 1 is illustrated with the columns 4, the channel 2, 3 or a generic beam and with the corresponding module of the cover 205.
  • the total encumbrance in height of the machine is calibrated on the mean height of a man with his arm raised and furthermore, the fulcra of the device of articulation 7 are illustrated and in dotted lines the arms 207, 307 of the same.
  • the length of the arms and the position of the fulcra is such, that during the angular motion upwards of the cover module 205, the vertical branch of the same carries out at least for a part of the motion a movement substantially rectilinear or vertical or in any case substantially parallel to itself, and with a very much reduced component of outward motion in direction of the front of the machine.
  • the outward motion takes place only and in a limited measure at the end of the angular motion in direction of opening of the cover segment 205.
  • the long section of the free bottom edge of the segments 205 of the cover is slightly folded inwards for a certain length of the vertical extension of the said vertical branch of the cover 5. This type of motion of opening the cover 5, allows both to limit the space required by the machine, as well as to avoid danger to the operators.
  • the activation of the motion of each segment of the cover or of the protection screen 5 is obtained with a particular type of linear actuator 8 that is articulated in 108 with its box 18 to a part of the structure of the corresponding module 101, 102,103, whereas it is articulated in 119 with a slider 19 at a radial arm rotary wise integral with the shaft of articulation 7 of the shaft of articulation 507 of the articulated trapeze 7 of suspension of the segment of the screen 5.
  • the axes of articulation 108 and 119 are parallel to the axis of the shaft of articulation 507 that transmits the motion to the screen 5.
  • the slider 19 is formed by a threaded nut engaged on a threaded rod 20 driven rotary wise by a driven output shaft 21 of the actuator.
  • the output shaft has a driven helical gear 22 that engages with a parallel helical drive gear 23 and that is fitted in a manner revolving together with the same on the input shaft 24 of the drive unit 8.
  • the input shaft and the driven helical gear are therefore parallel to the output shaft and to the driven helical gear associated with the same. Therefore the ends of the input shaft 24 become directly accessible, both and in correspondence of the same the input shaft is dynamically connected to a main drive motor 25 and to an additional auxiliary emergency motor 26.
  • the main motor 25 is preferably of the electrical type, whereas the auxiliary emergency motor is of the pneumatic type.
  • the pair of helical gears 22, 23 is illustrated in more detail in Fig. 6.
  • the two helical gears are of the type based on the concept conceived by B. Popper and of the so called "Twinworm gear”. (Nicholas Chironis, Associate editor).
  • This type of gear allows to transmit a rotation when the torque is transmitted from the drive gear 23.
  • the torque is transmitted in opposite direction from the driven gear to the one of drive, one has a reciprocal underpinning effect, and therefore effectively preventing the rotation in any direction of rotation.
  • This effect is obtained thanks to the fact the two gears have helical threads 122, 123, with different pitches between each other.
  • the pair of helical gears according to the invention have furthermore different diameters and is made according to a perfecting of the above mentioned principle that improves the features of transmission and of automatic locking or irreversibility.
  • each helical gear is formed by two axial segments each of which has a helical thread 122, 123, 122', 123'.
  • the two helical threads 122, 122', and 123, 123' of the two helical gears 22, 223 are made symmetrically identical to each other relative to a median plane transversal to the axis and are interspaced by an intermediate section 222, 223 without thread.
  • the segment of the protection screen 5 is therefore always firmly locked in position against an accidental return into the position of closure, in any intermediate position of lift and in the completely raised position without requiring automatic installations of control and actuation of devices locking the segment of screen 5 in position or still worse locking means in removable positions and of the manually driven type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Battery Mounting, Suspending (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
  • Transmission Devices (AREA)
  • Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
  • Auxiliary Devices For Machine Tools (AREA)

Claims (11)

  1. unité d'entraînement de sécurité en combinaison avec un écran de protection (5, 205) mobile, en particulier dans des machines de fabrication, ladite unité comprenant au moins un moteur d'entraînement (25, 26) relié à l'écran de protection (5, 205) par une transmission mécanique, caractérisée par les particularités suivantes :
    a) la transmission est une transmission à tige filetée double formée de deux engrenages hélicoïdaux (22, 23) parallèles, l'un d'eux, appelé engrenage menant (23), étant relié dynamiquement au moteur d'entraînement (25, 26) et l'autre, appelé engrenage mené (22), étant relié dynamiquement à l'écran de protection, lesdits engrenages hélicoïdaux (22, 23) engrenant entre eux par leurs filetages hélicoïdaux (122, 122' ; 123, 123') ayant des pas différents, d'une manière telle que la rotation de l'engrenage menant (23) dans les deux directions provoque la rotation de l'engrenage mené (22) dans les deux directions, tandis qu'une rotation de l'engrenage mené (22) dans l'une des deux directions provoque un appui de blocage de celui-ci dans ou avec l'engrenage menant (23) qui empêche la rotation ;
    b) chaque engrenage hélicoïdal (22, 23) est formé de deux moitiés axiales comportant chacune son propre filetage hélicoïdal (122, 122', 123, 123') et lesdits filetages hélicoïdaux (122, 122', 123, 123') desdites deux moitiés étant symétriques l'un de l'autre vis-à-vis du plan moyen transversal à l'axe de rotation, tandis que les filetages hélicoïdaux (123, 123') des deux moitiés d'un engrenage hélicoïdal (23) engrènent avec le filetage hélicoïdal (122, 122') de la moitié associée de l'autre engrenage hélicoïdal (22).
  2. Unité d'entraînement de sécurité suivant la revendication 1, caractérisée par le fait que les deux filetages symétriques (122, 122', 123, 123') sont séparés par une section intermédiaire sans filetage (222, 223).
  3. Unité d'entraînement de sécurité suivant les revendications 1 ou 2, caractérisée par le fait que l'arbre de sortie (21) qui est solidaire en rotation de l'engrenage hélicoïdal mené (22) entraîne la tige filetée (20) d'une transmission supplémentaire d'une tige filetée et d'un écrou fileté (19) qui entraîne à son tour le mouvement de l'écran de protection (5, 205).
  4. Unité d'entraînement de sécurité suivant une ou plusieurs des revendications précédentes, caractérisée par le fait que l'arbre menant (24) sur lequel l'engrenage menant (23) est calé est décalé latéralement vis-à-vis de l'arbre mené (21) et deux moteurs (25, 26) séparés sont reliés à l'arbre menant (24), chacun d'eux étant relié en rotation à l'une des deux extrémités opposées dudit arbre menant (24).
  5. Unité d'entraînement de sécurité suivant la revendication 4, caractérisée par le fait que l'un des deux moteurs (25) est constitué par un moteur électrique et est le moteur principal, tandis que l'autre moteur (26) est le moteur de secours et est de préférence formé d'un moteur du type pneumatique.
  6. Unité d'entraînement de sécurité suivant une ou plusieurs des revendications précédentes, caractérisée par le fait qu'elle constitue un actionneur linéaire (8) à double moteur et présente un encombrement tel qu'elle peut être montée sensiblement de la même manière que les actionneurs linéaires habituels.
  7. Unité d'entraînement de sécurité suivant la revendication 6, caractérisée par le fait que le boîtier (18) du dispositif présente un siège d'articulation (108), tandis que l'écrou fileté (19) glissant sur la tige filetée (20) présente également des joints d'articulation (119) pour des oscillations autour d'un axe transversal à l'axe longitudinal de la tige filetée (20).
  8. Unité d'entraînement de sécurité suivant l'une quelconque des revendications 1 à 7, caractérisée par le fait que l'écran de protection comprend un support de mouvement se présentait sous forme d'un parallélogramme articulé, en particulier d'un trapèze articulé (7), et en ce qu'un actionneur linéaire (8) formé par l'unité d'entraînement est interposé entre une partie d'une structure porteuse, à laquelle l'écran est associé, et un bras radial entraînant dans un mouvement de révolution un arbre de transmission (507) du trapèze articulé.
  9. Unité d'entraînement de sécurité suivant la revendication 8, caractérisée par le fait que l'écran de protection est subdivisé en plusieurs segments présentant chacun une articulation sur une partie de la structure porteuse avec un trapèze ou autre quadrilatère articulé (7) et auquel est relié sa propre unité d'entraînement (8).
  10. Unité d'entraînement de sécurité suivant les revendications 8 ou 9, caractérisée par le fait que l'écran de protection comprend une section transversale en forme de L inversé, les deux parties étant séparables l'une de l'autre.
  11. Unité d'entraînement de sécurité suivant une ou plusieurs des revendications précédentes 8 à 10, caractérisée par le fait que le mouvement d'entraînement du déplacement de l'écran de protection (5) est transmis par l'arbre (507) du quadrilatère articulé (7) coïncidant avec l'axe inférieur d'articulation de la structure de support fixe du couvercle.
EP99120332A 1998-10-14 1999-10-12 Unité d'entraînement à sécurité en combinaison avec un écran de protection, notamment pour des machines de fabrication Expired - Lifetime EP0994032B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998SV000059A IT1305420B1 (it) 1998-10-14 1998-10-14 Gruppo di azionamento di sicurezza, in particolare per lamovimentazione di schermi di protezione nelle macchine operatrici
ITSV980059 1998-10-14

Publications (2)

Publication Number Publication Date
EP0994032A1 EP0994032A1 (fr) 2000-04-19
EP0994032B1 true EP0994032B1 (fr) 2004-03-31

Family

ID=11408309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99120332A Expired - Lifetime EP0994032B1 (fr) 1998-10-14 1999-10-12 Unité d'entraînement à sécurité en combinaison avec un écran de protection, notamment pour des machines de fabrication

Country Status (3)

Country Link
EP (1) EP0994032B1 (fr)
DE (1) DE69915964T2 (fr)
IT (1) IT1305420B1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE795487A (fr) * 1972-05-08 1973-05-29 Gfa Antriebstechnik G M B H Dispositif de verrouillage pour un mecanisme enrouleur
DE3641654A1 (de) * 1986-12-05 1988-06-16 Gfa Antriebstechnik Gmbh Betaetigungsvorrichtung
US5617987A (en) * 1995-05-11 1997-04-08 Fibres South, Inc. Safety guard for fiber processing unit
IT1288447B1 (it) 1996-07-05 1998-09-22 Sasib Spa Gruppo di azionamento, in particolare nelle macchine operatrici automatiche.

Also Published As

Publication number Publication date
ITSV980059A1 (it) 2000-04-14
ITSV980059A0 (it) 1998-10-14
IT1305420B1 (it) 2001-05-04
DE69915964D1 (de) 2004-05-06
DE69915964T2 (de) 2004-10-28
EP0994032A1 (fr) 2000-04-19

Similar Documents

Publication Publication Date Title
EP0930983B1 (fr) Dispositif de réglage pour siège de véhicule
EP1329360B1 (fr) Marchepied escamotable
US20070221895A1 (en) Lifting Device
US5585126A (en) Closing unit for form tools of an injection molding machine
US6345547B1 (en) Linear actuator
DE102005018686B4 (de) Pflegebett mit Doppelmotorantrieb
US11524809B2 (en) Working station with a lifting mechanism for a packaging machine
CN113060670B (zh) 举升装置
CN202401735U (zh) 自动抹灰机
CN213976875U (zh) 直臂双回转检修作业平台机构
EP0994032A1 (fr) Unité d'entraínement à sécurité, spécalement pour le mouvement d'écrans de protection dans les machines de fabrication, et écran de protection pour des machines automatiques de fabrication
CN1320188A (zh) 钻井船上拉紧立管的方法和装置
CN113585705A (zh) 一种房建施工吊篮
EP2746640B1 (fr) Colonne télescopique et système de poste de travail
CA3187630C (fr) Actionneur lineaire a ecrou de securite de type contact et plateforme de travail aerien
CN215556563U (zh) 一种便于安装的矿用隔爆提升机电控装置
CN211579267U (zh) 机舱用的控制柜
CN107895910A (zh) 一种电力检修架
EP1526118B1 (fr) Appareil pour soulever et abaisser des plongeurs dans un distributeur pour une machine à façonner le verre
CN221024662U (zh) 挡板宽度调整装置
EP1543744B1 (fr) Dispositif de levage pour lits
CN220600685U (zh) 一种可调节固定管架
CN115786880B (zh) 一种升降翻盖机构
JPH11192127A (ja) 昇降作業台
CN213834449U (zh) 一种具有转向机构的防爆电气工程管理用升降装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20000907

AKX Designation fees paid

Free format text: DE FR GB

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SASIB S.P.A.

17Q First examination report despatched

Effective date: 20030326

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RTI1 Title (correction)

Free format text: SAFETY DRIVE UNIT IN COMBINATION WITH A MOVABLE OF PROTECTION SCREEN, PARTICULARLY IN MANUFACTURING MACHINES

RTI1 Title (correction)

Free format text: SAFETY DRIVE UNIT IN COMBINATION WITH A MOVABLE OF PROTECTION SCREEN, PARTICULARLY IN MANUFACTURING MACHINES

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 69915964

Country of ref document: DE

Date of ref document: 20040506

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041012

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20050104

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050503

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20041012

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050630

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST