EP0795475A1 - Vorrichtung zum Steuern der Bandzufuhr in einer Umreifungsmaschine - Google Patents

Vorrichtung zum Steuern der Bandzufuhr in einer Umreifungsmaschine Download PDF

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Publication number
EP0795475A1
EP0795475A1 EP97104393A EP97104393A EP0795475A1 EP 0795475 A1 EP0795475 A1 EP 0795475A1 EP 97104393 A EP97104393 A EP 97104393A EP 97104393 A EP97104393 A EP 97104393A EP 0795475 A1 EP0795475 A1 EP 0795475A1
Authority
EP
European Patent Office
Prior art keywords
strap
pressure
driving wheel
wheel
control device
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.)
Ceased
Application number
EP97104393A
Other languages
English (en)
French (fr)
Inventor
Franco Tacchini
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.)
Officina Meccanica Sestese SpA
Original Assignee
Officina Meccanica Sestese 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 Officina Meccanica Sestese SpA filed Critical Officina Meccanica Sestese SpA
Priority claimed from US08/816,419 external-priority patent/US5778643A/en
Publication of EP0795475A1 publication Critical patent/EP0795475A1/de
Ceased legal-status Critical Current

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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
    • B65B13/00—Bundling articles
    • B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
    • B65B13/22—Means for controlling tension of binding means

Definitions

  • the present invention concerns a strapping machine and, more particularly, a device to control the feeding of the strap, allowing a more precise and rapid control of the strap stopping or speed-changing function during its recovery, that is, closing and tightening of the strap around the packed product to be fastened.
  • machines of this type comprise drive means which draw the strap from a reel, launch it into a special guide track around the product to be packed, and then recover it - after its leading end has been blocked or clamped - so as to wind it around the product with a preset tension. Further means then provide to tie and cut the strap after its windup.
  • One of the problems arising with the increase of the strap feeding speed is to obtain its instant and prompt stopping at the end of the launching stroke and, respectively, at the end of the recovery stroke.
  • the inertia of the machine parts and thus the effect of residual drag of the strap resulting therefrom causes an undesired tightening thereof around the product to be packed, at a tension higher than that expected, which may often cause damage to said product.
  • the object of the present invention is to thus realize a strapping machine which enables, with a simpler and more economic structure, to perfectly control the tensioning of the strap, during its recovery, and then the stopping thereof, so that the packed product may be fastened with a perfectly registered tightening.
  • a strapping machine of the general type described heretofore said object is reached by means of the characteristics indicated in Claim 1.
  • a strapping machine generally comprises a guiding channel C for the strap, forming a closed-ring path - through which is moved the product P to be fastened (shown only by a dash-and-dot line) - and a strapping head T, which mainly includes a strap driving unit T1 (to launch the strap along the path C and recover the same) and a strap welding unit T2 to weld the ends of the strap.
  • a strap launching step in which the strap is caused to pass through the welding unit T2, and slide along the channel C (for example, in the anticlockwise direction indicated by the arrows in fig. 1) up to reaching again the welding unit T2; at this point, the end of the strap is temporarily blocked by a gripper; a strap recovery step then starts and continues until the strap has been properly tightened around the product P; the final step consists in welding the two ends of the strap and in cutting the same.
  • the object of the invention is the strap launching and recovery unit T1 which, as pointed out further above, forms the most critical part of the machine.
  • said unit comprises a drive shaft 1, rotating clockwise at low speed - hereinafter, the clockwise direction will be that indicated by the rotation arrow referring to the shaft 1 in fig. 2 - and being active during slow recovery of the strap.
  • a driving wheel 2 On the drive shaft 1 there is mounted a driving wheel 2, by way of a so-called “freewheel” mechanism, which allows to draw the strap only in an anticlockwise direction.
  • a second drive shaft 3 is rotated at high speed and carries, keyed thereon, a fast driving wheel 4; said shaft 3 is active both during the launching step, with a clockwise rotation (see arrow in fig. 2), and during the fast recovery step, with an anticlockwise rotation (see arrow in figs. 3 and 4).
  • the shafts 1 and 3 are driven by a single motor, which drives the shaft 1 through a reduction gear, and thus at low speed but with a high drawing force, and which directly drives the shaft 3, whose wheel 4 rotates at high speed but with less drawing force.
  • a pressure wheel 5 cooperates moreover with the driving wheel 4, to ensure drawing of the strap R interposed between said wheels.
  • the pressure wheel 5 is mounted freely rotating on a shaft supported by an arm 6 which is mounted oscillating on the same axis of the shaft 1; a spring 7 imparts onto the arm 6 a thrust, which can be regulated by way of an adjusting element 7a, and which determines the pressure of the wheel 5 against the wheel 4.
  • a transmission wheel 13 is mounted freely rotating at the upper end of the sector 8. Furthermore, substantially at the centre of the sector 8 there is fixed a pressure pad 14, whose arc-shaped surface 14a is centred on the axis of the shaft 1 and thus runs parallel to the periphery of the wheel 2; the surface 14a facing the wheel 2 is perfectly smooth, to act as an anti-friction surface for the purpose better specified hereunder.
  • a guide 15a-15b is moreover fixed to the sector 8 for the function indicated hereinafter.
  • a microswitch 16 is mounted on the fixed support 10, said microswitch being operated by a rod 17, 17a, moved by the roller 9 in opposition to the adjustable spring 18.
  • the aforedescribed strapping head works as follows:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
EP97104393A 1996-03-14 1997-03-14 Vorrichtung zum Steuern der Bandzufuhr in einer Umreifungsmaschine Ceased EP0795475A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT96MI000489A IT1284429B1 (it) 1996-03-14 1996-03-14 Dispositivo di controllo del trascinamento della reggia in una testa reggiatrice
ITMI960489 1996-03-14
CA002199928A CA2199928A1 (en) 1996-03-14 1997-03-13 Device to control the feeding of the strap in a strapping machine
US08/816,419 US5778643A (en) 1996-03-14 1997-03-14 Device to control the feeding of the strap in a strapping machine

Publications (1)

Publication Number Publication Date
EP0795475A1 true EP0795475A1 (de) 1997-09-17

Family

ID=27170303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97104393A Ceased EP0795475A1 (de) 1996-03-14 1997-03-14 Vorrichtung zum Steuern der Bandzufuhr in einer Umreifungsmaschine

Country Status (3)

Country Link
EP (1) EP0795475A1 (de)
CA (1) CA2199928A1 (de)
IT (1) IT1284429B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19924352A1 (de) * 1999-05-27 2000-11-30 Smb Schwede Maschb Gmbh Rückspannvorrichtung für Umreifungsmaschinen
US6334563B1 (en) 1999-05-05 2002-01-01 Smb Schwede Maschinenbau Gmbh Retensioning device for strapping machines
EP2460732A1 (de) 2010-12-02 2012-06-06 Officina Meccanica Sestese S.p.A. Spannungsanpassungsvorrichtung in einem Umreifungskopf und zugehörige Umreifungsmaschine
CN116022400A (zh) * 2023-03-29 2023-04-28 无锡瑞进智能工程有限公司 一种棒材打捆机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3526187A (en) * 1968-10-02 1970-09-01 Signode Corp Toggle controlled strapping apparatus and method
DE4014307A1 (de) * 1990-05-04 1991-11-07 Rmo Systempack Gmbh Packmaschine
US5379576A (en) * 1992-06-10 1995-01-10 Strapack Corporation Band feeding and tightening apparatus for packing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3526187A (en) * 1968-10-02 1970-09-01 Signode Corp Toggle controlled strapping apparatus and method
DE4014307A1 (de) * 1990-05-04 1991-11-07 Rmo Systempack Gmbh Packmaschine
US5379576A (en) * 1992-06-10 1995-01-10 Strapack Corporation Band feeding and tightening apparatus for packing machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6334563B1 (en) 1999-05-05 2002-01-01 Smb Schwede Maschinenbau Gmbh Retensioning device for strapping machines
DE19924352A1 (de) * 1999-05-27 2000-11-30 Smb Schwede Maschb Gmbh Rückspannvorrichtung für Umreifungsmaschinen
EP2460732A1 (de) 2010-12-02 2012-06-06 Officina Meccanica Sestese S.p.A. Spannungsanpassungsvorrichtung in einem Umreifungskopf und zugehörige Umreifungsmaschine
CN116022400A (zh) * 2023-03-29 2023-04-28 无锡瑞进智能工程有限公司 一种棒材打捆机
CN116022400B (zh) * 2023-03-29 2023-06-09 无锡瑞进智能工程有限公司 一种棒材打捆机

Also Published As

Publication number Publication date
ITMI960489A0 (de) 1996-03-14
CA2199928A1 (en) 1997-09-14
ITMI960489A1 (it) 1997-09-14
IT1284429B1 (it) 1998-05-21

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