EP2078125B1 - Drahtbindemaschinen - Google Patents

Drahtbindemaschinen Download PDF

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Publication number
EP2078125B1
EP2078125B1 EP07824085A EP07824085A EP2078125B1 EP 2078125 B1 EP2078125 B1 EP 2078125B1 EP 07824085 A EP07824085 A EP 07824085A EP 07824085 A EP07824085 A EP 07824085A EP 2078125 B1 EP2078125 B1 EP 2078125B1
Authority
EP
European Patent Office
Prior art keywords
wire
machine
spool
sensing arrangement
contact
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.)
Not-in-force
Application number
EP07824085A
Other languages
English (en)
French (fr)
Other versions
EP2078125A2 (de
Inventor
Ian David Coles
Graham Frank Barnes
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.)
Tymatic Ltd
Original Assignee
Tymatic Ltd
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Filing date
Publication date
Application filed by Tymatic Ltd filed Critical Tymatic Ltd
Publication of EP2078125A2 publication Critical patent/EP2078125A2/de
Application granted granted Critical
Publication of EP2078125B1 publication Critical patent/EP2078125B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E04G21/122—Machines for joining reinforcing bars
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E04G21/122—Machines for joining reinforcing bars
    • E04G21/123—Wire twisting tools

Definitions

  • This invention relates to machines for tying a length of wire around two or more objects to bind them together. It relates particularly to wire tying machines for use in binding steel reinforcing bars into a lattice as part of construction of reinforced concrete structures.
  • the tying machine generally comprises a wire feed mechanism which draws the wire from a spool and feeds the wire in a loop around the intersection of the bars until the wire returns back to the machine. The wire is then cut and the two ends are gripped by a rotating head which rotates to twist the wire.
  • twisting action For a successful tying operation the twisting action must not be commenced until both ends of the wire have been properly gripped and the wire has been cut. For example, if the wire should get stuck somewhere in the machine or run out, then if the head starts to turn damage to the machine can be caused which could put the machine out of use and require costly repairs.
  • EP-A-0822303 discloses the idea of measuring the torque generated by a motor driving the twisting mechanism and halting the twisting if the torque (as measured by the current drawn by the motor) is not seen to be increasing after a predetermined time. It is inferred from this that the wire is not being properly twisted.
  • this solution is not ideal as it only gives an indirect indication of the proper progression of the wire and could still lead to damage caused by the attempted initial rotation of the head before it is halted.
  • the present invention provides a machine for tying a wire around one or more objects comprising a wire sensing arrangement for sensing the presence of the wire in a predetermined part of the machine, the wire sensing arrangement being configured to detect presence of the wire when the wire closes an electrical circuit so that an electrical current passes through part of the wire.
  • the wire itself is used as part of the sensing arrangement which gives a straightforward, direct and reliable way of detecting the presence or absence of the wire in a particular part of the machine.
  • the sensing arrangement is configured to sense the presence of the wire in a part of the machine to which the wire is returned after passing around the object(s) to be tied.
  • the sensing arrangement in such an embodiment is configured to detect when the wire has been properly looped around the object so that e.g. twisting can commence. It will be appreciated that this gives a positive, reliable indication of the presence of the wire so that the risk of damage being caused by twisting before the end of the loop has been properly received can be avoided.
  • the sensing arrangement in such embodiments could comprise a wiper electrode adapted and positioned to contact the edge of the wire when it is in the predetermined correct position.
  • the sensing arrangement comprises an electrode surface which is adapted to contact the end of the wire when the wire has been received at the predetermined part of the apparatus.
  • the electrode can be made extremely robust for example by incorporating it as part of a surface of the apparatus. This obviates the risk associated with a resilient wiper contact of the contact becoming bent or damaged when struck by the end of the wire.
  • the machine is configured so that if the wire is not sensed within a predetermined time an error signal is given and normal operation is suspended. This allows the operator for example to put the machine into a maintenance model which will be described later.
  • the sensing arrangement is arranged to detect when the end of a wire spool has been reached and/or there is a break in the wire on the spool.
  • the sensing arrangement would therefore be configured such that wire coming off the spool normally closes an electrical circuit so that when the wire breaks or runs out the circuit is broken which can be detected to allow appropriate action to be taken. This reduces the possibility of the end of the wire becoming trapped in the machine which might be difficult to remove and/or cause damage if the machine is used.
  • a resilient wiper contact is preferred.
  • the sensing arrangement could be employed in any other desired part of the machine. More importantly, the two sensing arrangements described above, and indeed any others, are not mutually exclusive. For example, a voltage could be applied to the wire which is sensed in any of several locations.
  • the machine is configured to operate normally if the measured conductance is within a predetermined range of the reference conductance but to cease normal operation or give an error signal if it is outside that range.
  • the wire is simply allowed to contact a conductive part of the structure of the apparatus so that the wire is at the same potential as the body of the apparatus - e.g. 0 volts or +/-12 volts.
  • the electrode or plurality of electrodes need(s) then only to measure the presence or absence of this voltage to determine the presence or absence of the wire. This is advantageous in requiring only a single electrode but more generally it means that it is not necessary to isolate the wire electrically from the body of the machine which simplifies the machine design.
  • the wire feed means of the machine is configured to detect the drawing resistance presented by the wire and to cease feeding the wire when said drawing resistance or rate of rise thereof is above a threshold value.
  • the drawing resistance is measured by measuring the current drawn by a motor driving the wire feed means.
  • a tying machine in accordance with at least some embodiments of the invention is able reliably to detect when the wire on a spool has ruh out.
  • the machine is arranged in such a way that normal operation is ceased when it is detected that the wire has run out This reduces the danger of wire becoming entangled in the machine and potentially causing damage.
  • the rotating head of the machine is locked to prevent rotation under such circumstances.
  • the machine is arranged to reverse the wire feed mechanism to return the short length of wire which was drawn into the machine back into the vicinity of the spool for easy removal.
  • the machine is configured thereafter to enter a maintenance mode.
  • the machine is preferably configured, upon suitable actuation, to advance a wire feed mechanism in a manner allowing a new wire to be threaded into the machine e.g, at a lower speed than the wire feed usually operates at. It will be appreciated that this obviates the need to release any part of the wire feed mechanism to insert a new wire manually. This avoids the disadvantages of having such a manual release mechanism which were set out earlier.
  • FIGs. 1a , 1b and 2 there is shown two perspective views and a sectional view of part of a tying machine of the general type to which the invention can be applied with certain parts such as the housing, handle, battery, controls and wire spool removed for clarity.
  • the apparatus is shown situated over a junction where two steel bars 2 cross over each other at right angles.
  • the steel bars 2 are intended to form a rectangular grid to be embedded in a concrete structure in order to reinforce it.
  • the rotary head of the apparatus 4 This includes a horizontal circular base plate 6 extending up from which is a channel 8 which is approximately semi-circular in vertical section and of approximately constant width in the orthogonal direction. In the centre of base plate 6 is a part-spherical depression 9. The underneath of the base plate 6 is shown in Fig. 3 from which it will be seen that on one side there is a narrow slot 10 corresponding to one end of the semi-circular channel and on the other side of the plate 6 corresponding to the other end of the channel is a funnel region 12.
  • the upper cylindrical portion of the head 14 which is rotatably mounted in the cylindrical portion 16a of a bracket member mounted to the housing (not shown) by a flange portion 16b (omitted from Fig. 1b ).
  • the upper head portion is supported by two rotary bearings 18.
  • a toothed gear wheel, 20 is provided fixed at the top of the head to allow it to be driven by a motor 22 via a worm gear.
  • a solenoid assembly comprising a cylindrical outer tube 26 housing the coil and an inner plunger 28 which is able to slide vertically relative to the coil 26.
  • an actuating disc 30 At the bottom end of the plunger 28 is an actuating disc 30, which is used to operate wire gripping clutch mechanisms.
  • a pivotally mounted angled clutch lever 32 On the left hand side as seen from Fig. 2 , there may be seen a pivotally mounted angled clutch lever 32.
  • a pair of compression springs 36 act on the longer, upper arm of the lever 32 so as to bias the lever in an anti-clockwise direction in which the shorter, lower arm is pressed downwardly.
  • any number of springs might be used.
  • To the right of the clutch lever 32 are a series of roller wheels 38a,38b,38c the purpose of which will be explained below.
  • a similar clutch lever is provided, displaced approximately 180 degrees around the head. This is not therefore visible in the sectional view.
  • a wire feed inlet guide 40 which receives the free end of wire 46 which has been unwound from the spool (not shown).
  • FIG. 4 shows in detail a wire-spool-empty detector embodying the invention.
  • the tying machine on which the detector is employed is a little different to that described with reference to Figs. 1a , 1b , 2 and 3 but operates in essentially the same way.
  • Fig. 4 there may be seen a wire spool 50 around which is wound circular diameter steel wire 52.
  • the wire spool 50 is mounted via a spindle (not shown) to a spool support bracket 54.
  • This bracket 54 is connected to the metal frame of the machine, indicated generally by the reference numeral 56.
  • Part of a wire feed mechanism may be seen which comprises a pair of opposed rollers 58, 60, one or both of which may be driven. Conveniently just the lowermost roller 60 is driven in this embodiment.
  • the uppermost roller 58 is shown mounted on a spindle 62 which is supported between a pair of arms 64 which are themselves pivotally mounted to the frame to allow the upper wheel 58 to move up and down although a spring (not shown) biases the reel 58 down onto the opposing reel 60 in order to ensure that the wire 52 passing between the rollers 58, 60 is firmly gripped.
  • a funnel element 66 is provided immediately upstream of the rollers 58, 60 to facilitate insertion of the end of the wire from a new spool.
  • a wiper contact member 68 Upstream of the funnel member 66 is a wiper contact member 68 which is mounted to a support post 70 extending from the main body 56.
  • An electrically insulated plastic layer (not clearly visible) is sandwiched between the contact member 68 and the post 70 so that they are electrically isolated from one another.
  • the contact member 68 comprises a gently curved portion which is positioned to press resiliently against the wire 52 as it comes off the spool, past the contact 68 into the funnel member 66.
  • the body of the machine 56 is connected to the common voltage rail of the circuit board controlling the machine (not shown).
  • the wire is in physical and therefore electrical contact with several metal parts of the machine body 56, most of which are not shown in Figure 4 although these could include the funnel member 66.
  • the wire 52 is therefore at the same electrical potential as the body 56 i.e. the common rail voltage of the circuit board.
  • the wire 52 completes an electrical circuit between the body of the machine 56 (e.g. via the funnel member 66) and the contact member 68.
  • the machine will operate normally.
  • the wire on the spool 50 runs out, the common rail potential will no longer be detected at the contact member 68 and this change of potential can be detected by the control circuit.
  • the wire feed rollers 58, 60 are immediately stopped and reversed so that the short length of wire which has been drawn into the machine body is returned into the spool cavity from where it is easy to remove when the spool is changed.
  • the machine After returning the end of the wire, the machine is automatically put into maintenance mode.
  • the rotary head (see item 4 in Figs. 1a to 2 ) may be locked into position or at least prevented from rotating in the direction of twisting as a further protective measure.
  • the control circuit alters the way in which the wire feed roller 60 is driven so that when the trigger or other actuation switch is operated, the roller is driven only slowly compared to its normal speed. This allows a new spool 50 to be inserted. The end of the wire on the new spool is manually fed into the funnel member 66 and the trigger operated so as to take up the end of the wire into the machine.
  • the spool-empty detection mechanism described above works well for spools where the inner end of the wire is freed when the spool runs out Sometimes however spools are wound so that the inner end is attached to the spool. For example this can make the spool easier to wind. The afore-described mechanism will not work in such circumstances.
  • the control circuit also monitors the current drawn by the motor driving the lower roller 60. When a spool runs out with the end of the wire remaining attached and the rollers 58, 60 continue to try to draw the fixed wire in, the drawing resistance which is encountered by the rollers will rise rapidly, and so therefore will the electrical current drawn by the associated motor.
  • FIG. 5 A further wire presence sensor embodying the invention is shown in Fig. 5 .
  • the Figure shows in close-up detail the rotary head 70 of the machine shown in Fig. 4 .
  • the head 70 comprises a disc 72 with two opposed radial slots through which the wire 52 passes when pulled taut for twisting.
  • a curved wire guide surface 74 Situated above the head base plate 72 is a curved wire guide surface 74. At one end (the right end as viewed) the surface drops away to allow the wire to slide along it easily.
  • a planar surface electrode 76 is provided at one face of a support column 78.
  • An electrically insulating plastic film layer is provided between the electrode 76 and the support column 78 in order to electrically isolate them from one another.
  • the wire 52 is issued by wire issuing means (not shown) to the left side of the head 70 (as viewed), it executes a loop around the reinforcing bars (also not shown) and re-enters the machine to the right of the head 70. It then slides over the guide surface 74 until it abuts the electrode 76. At this point the electrode detects the common rail potential at which the wire is by virtue of its contact with the body elsewhere (e.g. the guide surface 74) which causes the wire issuing rollers to stop and the wire clamps (not shown) to grip the wire. The wire issuing rollers are then reversed to retract the wire and pull it taut. Thereafter the head 70 can rotate to twist the wire as is known.
  • the wire will not be detected and so the twisting operation will not be attempted, thereby avoiding the possibility of damage to the machine or injury to an operator. If the wire is not detected within a predetermined time from beginning the wire issuing, an alarm signal is given and the machine can be put into maintenance mode by the operator. It will further be appreciated that since the electrode 76 is located on the nonrotating support column 78 of the machine body, the disclosed arrangement will also prevent the twisting operation from being attempted should the head 70 not be in the correct rotary orientation for any reason.

Claims (14)

  1. Maschine zum Binden eines Drahts (52) um einen oder mehrere Gegenstände (2), die eine Drahterfassungsanordnung umfasst, um das Vorhandensein des Drahts (52) in einem vorgegebenen Teil der Maschine (4) zu erfassen, wobei die Drahterfassungsanordnung konfiguriert ist, um das Vorhandensein des Drahts (52) zu detektieren, wenn sich der Draht an eine elektrische Schaltung annähert, so dass durch einen Teil des Drahts (52) ein elektrischer Strom fließt.
  2. Maschine nach Anspruch 1, wobei die Erfassungsanordnung konfiguriert ist, um das Vorhandensein des Drahts (52) in einem Teil der Maschine (4) zu erfassen, in den der Draht zurückgeführt wird, nachdem er um den oder die zu bindenden Gegenstände (2) geführt worden ist.
  3. Maschine nach Anspruch 2, wobei die Erfassungsanordnung eine Elektrodenoberfläche (68; 76) aufweist, die dazu ausgelegt ist, mit dem Ende des Drahts (52) in Kontakt zu gelangen, wenn der Draht an dem vorgegebenen Teil der Vorrichtung (4) aufgenommen worden ist.
  4. Maschine nach einem vorhergehenden Anspruch, die so konfiguriert ist, dass dann, wenn der Draht (52) innerhalb einer vorgegebenen Zeit nicht erfasst wird, der Normalbetrieb unterbrochen wird.
  5. Maschine nach einem vorhergehenden Anspruch, wobei die Erfassungsanordnung dazu ausgelegt ist, zu detektieren, wenn das Ende einer Drahtspule (50) erreicht worden ist und/oder wenn in dem Draht (52) auf der Spule (50) ein Bruch vorhanden ist.
  6. Maschine nach Anspruch 5, die einen elastischen Schleifkontakt (68) aufweist, um die Detektion auszuführen.
  7. Maschine nach einem vorhergehenden Anspruch, wobei die Erfassungsanordnung konfiguriert ist, um einen elektrischen Kontakt mit dem Draht (52) an zwei diskreten Punkten herzustellen.
  8. Maschine nach einem vorhergehenden Anspruch, wobei die Erfassungsanordnung konfiguriert ist, um einen elektrischen Kontakt mit dem Draht (52) herzustellen, indem zugelassen wird, dass der Draht mit einem leitenden Teil der Struktur (56) der Vorrichtung in Kontakt gelangt, so dass der Draht auf dem gleichen Potential wie die Struktur liegt.
  9. Maschine nach einem vorhergehenden Anspruch, die Drahtvorschubmittel (58, 60) aufweist, die konfiguriert sind, um einen Zugwiderstand, den der Draht (52) aufweist, zu detektieren und den Vorschub des Drahts zu beenden, wenn der Zugwiderstand oder dessen Anstiegsrate über einem Schwellenwert liegt.
  10. Maschine nach Anspruch 9, wobei der Zugwiderstand durch Messen des Stroms, der von einem Motor gezogen wird, der die Drahtvorschubmittel (58, 60) antreibt, gemessen wird.
  11. Maschine nach einem vorhergehenden Anspruch, die Mittel umfasst, um zu detektieren, wenn der Draht (52) auf einer Spule (50) abgewickelt worden ist, und die so konfiguriert sind, dass der Normalbetrieb beendet wird, wenn detektiert wird, dass der Draht abgewickelt ist.
  12. Maschine nach Anspruch 11, die einen Drehkopf (4) aufweist und so konfiguriert ist, dass der Drehkopf verriegelt wird, um eine Drehung zu verhindern, wenn detektiert wird, dass der Draht (52) abgewickelt ist.
  13. Maschine nach Anspruch 11 oder 12, die dazu ausgelegt ist, einen oder den Drahtvorschubmechanismus (58, 60) umzukehren, um ein Teilstück des Drahts (52) zurückzuführen, das in die Maschine zurück in die Umgebung der Spule (50) für eine einfache Entnahme gezogen wird.
  14. Maschine nach Anspruch 11, 12 oder 13, die konfiguriert ist, um in einen Wartungsmodus einzutreten, nachdem detektiert worden ist, dass der Draht (52) abgewickelt ist, wobei die Maschine im Wartungsmodus konfiguriert ist, um bei geeigneter Betätigung einen Drahtvorschubmechanismus (58, 60) auf eine Weise vorwärts zu bewegen, die ermöglicht, dass ein neuer Draht in die Maschine eingefädelt wird.
EP07824085A 2006-10-09 2007-10-09 Drahtbindemaschinen Not-in-force EP2078125B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0619947.5A GB0619947D0 (en) 2006-10-09 2006-10-09 Wire tying machines
PCT/GB2007/003831 WO2008044002A2 (en) 2006-10-09 2007-10-09 Wire tying machines

Publications (2)

Publication Number Publication Date
EP2078125A2 EP2078125A2 (de) 2009-07-15
EP2078125B1 true EP2078125B1 (de) 2011-12-14

Family

ID=37454247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07824085A Not-in-force EP2078125B1 (de) 2006-10-09 2007-10-09 Drahtbindemaschinen

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Country Link
EP (1) EP2078125B1 (de)
AT (1) ATE537317T1 (de)
GB (1) GB0619947D0 (de)
WO (1) WO2008044002A2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102220714B (zh) * 2011-03-09 2012-12-12 徐建坤 多功能消音牛皮纸钢丝生产装置
CN102220713B (zh) * 2011-03-09 2013-05-15 徐建坤 一种多功能消音牛皮纸钢丝生产装置
SE540858C2 (sv) 2017-04-06 2018-12-04 Husqvarna Ab Anordning för att styra en tråd i en najningsmaskin och en najningsmaskin innefattande anordningen samt en najningsprocess

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027701A (en) * 1989-04-26 1991-07-02 Takigawa Kogyo Co., Ltd. Binding machine
JP2557192Y2 (ja) * 1993-04-19 1997-12-08 マックス株式会社 鉄筋等の結束機用のワイヤリール
US6584891B1 (en) * 2000-03-15 2003-07-01 Enterprises International, Inc. Apparatus and methods for wire-tying bundles of objects
US6968779B2 (en) * 2000-03-15 2005-11-29 Enterprises International, Inc. Apparatus and methods for wire-tying bundles of objects
EP2179806A3 (de) * 2001-09-28 2010-06-23 Max Kabushiki Kaisha Maschine zum Verrödeln von Bewehrungen, Rolle und Verfahren zur Erfassung der Drehung der Rolle
US20040040450A1 (en) * 2002-09-04 2004-03-04 Peroni Drew B. Wire coil winding apparatus and method

Also Published As

Publication number Publication date
WO2008044002A3 (en) 2008-11-20
EP2078125A2 (de) 2009-07-15
ATE537317T1 (de) 2011-12-15
WO2008044002A2 (en) 2008-04-17
GB0619947D0 (en) 2006-11-15

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