DE2135822A1 - Cut-off saw or cut-off saw - Google Patents

Description

Cut-off saw or cut-off saw

The invention relates to cutting saws for delicately dividing long Extruded profiles into shorter pieces with a cutting head, which is motorized forwards and forwards during work back again, "Specifically concerns the He" - Finding an automatic control for the return movement of the cutting head of such a saw.

The most frequently used and most powerful irennsaws work with an endless saw band, which, similar to a conventional band saw, is guided around two guide disks or wheels. Such forecast machine comprises a machine base or -bed and disposed thereon elongate Ar ~ beitstisch on which the v advanced to Separating material into the cutting zone / can ground ₀ The machine base carries in the region of the cutting zone of a cutting

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head that can be advanced in the cutting direction and also moved back again Saw band, the cutting head contains the saw band guide disks, the endless saw band and appropriately designed frame part © in which the saw band guide discs can be rotated are stored and which can be moved back and forth on the machine base. With some

"Cut-off or cut-off saw machines, becomes the cutting head translatorison (in some cases horizontal Ιώ others vertically) moved back and forth, while with other machines the cutting head can be pivoted like scissors is. In all cases, however, the back and forth movement sweeps over the path on which the material to be cut is to be cut on the table is advanced. The cutting head is motorized on all cutting saws with a saw band forwards in the cutting direction and then again

} moved backο

In some of these machines, the material to be cut is manually advanced on a table, which usually contains a group of rollers or rollers ₉ that support the workpieces. The more complicated cut-off saws use motor-driven feed devices that move the workpiece into and through the cutting zone and it

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stop to cut every time a previous one defined feed path has been covered "

The motor-driven feed device usually includes a sole slide that can be moved back and forth along the feed path on the machine frame with a clamping device that fixes the workpiece in the retracted position of the slide a stationary clamping device. A control provided on the sawing machine, which is combined with äeVi actuating devices for the cutting head, the carriage and the clamping devices, ensures synchronization and coordination of the movements «,

The machine control took care of the previously known cut-off saws with automatic workpiece feed that the cutting head was moved back over the Tollen Weg before the workpiece transport platform got a chance to start moving forward. Such a complete return movement of the Cutting head with each cutting process leads to a considerable loss of time if the workpiece to be cut has dimensions that are smaller than the dimensions

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dimension for which the machine was designed. One unnecessary delay results not only in the return movement of the cutting head over the point at which the Workpiece is released, but also during the subsequent Sehneidhub of the head before it becomes a actual cutting on the workpiece.

* To eliminate these drawbacks, and the cutting cycle to accelerate, were later developed separating and Trimming saws with manually adjustable trigger switches provided, which can be adjusted so that they move the cutting head back over a distance limited that was required to release the workpiece. Although this tool is theoretically sufficient It must be remembered that human error can lead to significant damage. If the operating

. person did not set the trigger switch exactly to the size of the workpiece to be cut or if the workpiece has different slide dimensions over the length and the trigger switch is only set for the thinner ropes, the workpiece must run against the cutting head, with the saw band often gets destroyed. In addition, the setting of the trigger switch ₉ does not necessarily have to be difficult, after all, a work

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gang, of a certain amount of time, a considerable experience and also requires special attention.

In view of the above considerations, the main object of the invention lies in creating an automatic control of the return stroke of the cutting head of a cutting or trimming saw ₉ which ensures at all times that the cutting head comes out of the area of the workpiece in front, even if the workpiece shows significant Dickon changes over the length, but the cutting head is only moved back in the return direction just as far as is necessary for the free passage of the workpiece »

This task is performed with a cut-off saw with a workpiece to be cut up and the workpiece support determining its feed direction and a motor-driven movable relative to the workpiece support Cutting head with motor-driven saw blade, which with its cutting edge is perpendicular to the feed path extending cutting plane is achieved in that the drive for the return stroke of the cutting head of a gentoinßam with the latter parallel to the plane of the section moving button is controlled, which extends a small distance in front of the saw blade cutting edge Scan line defined, which when hitting a work-

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piece switches on the return stroke drive of the cutting head and switches off the return stroke drive without workpiece detection and prevents it from switching on.

The button can be a light barrier arranged on the scanning line, which is located on the side of the workpiece front.

one
photocell attached to the cutting head in the feed path or

'Has a light source.

According to a further embodiment, the button is attached to the cutting head and directed in the direction of the cutting and return stroke movable swivel arm, which is pretensioned in the cutting direction in a normal position in which its lower edge defines the scanning line, voböi am Swivel arm a! ^ Switching device is attached, the in one position it switches on the return stroke of the cutting head and in the other position it switches on the return stroke prevented.

The button can also be pivoted parallel to the feed direction and in its normal position in be biased in a direction opposite to the workpiece feed.

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• β. f mm

Further details and features of the invention are revealed can be derived from the following detailed description and the accompanying drawings, in which preferred Embodiments of the invention are illustrated by way of example.

In the drawings show:

Fig. 1 is a perspective view of a

Cutting or cutting saw with an inventive Steering,

fig. 2 is a perspective view of the workpiece probe b, as an essential part of the control system and the neighboring machine parts,

Eigc 3 is a front view of the Werketüektasters in a partially opened state including the associated components,

Pig. 4 shows a cross section according to the section line 4-4 of FIG. 3,

FIG. 5 shows a section along the section line 5-5 of FIG.

Figures 6, 7 and 8

schematic front views of the machine to explain the control process

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the workpiece probe for workpieces located in the "cutting zone," Fig. 9 is a schematic plan view of a Part of the sawing machine to explain an actuation of the .Workstücktasters at unintentional workpiece feed " 3? Ig.1O a. Rectangular diagram of the controller and fig. 11 a more or less schematic

Side view of a cut-off or trimming saw with a modified embodiment of the scanning according to the invention and Steering"

In the drawings, generally with the reference number named cut-off saw is equipped with an automatic and control device 6 which controls the return movement of the cutting head 7 of the machine.

The cutting saw 5 shown uses an endless saw band 8 as a cutting tool, which, as is usual with band saws, runs around two band saw guide rollers 9. The cutting head 7 consists of a rigid head frame 10 in which the saw band guide rollers are rotatably mounted and held in a planar position one of the guide rollers 9 with .-: '■ -

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an Ilotor (not shown) driven.

The head frame 10 is aa machine frame or bed 12 movable back and forth for the cutting and return stroke stores. For the sake of simplicity, the connection 13 between the Sohneidkopf frame 1.0 and the Machine bed 12 shown as a hinge, so that the son's head must pivot over an arc, when it moves over the cutting and return stroke. Ia further. During the course of the description, it will no longer be peculiar to the fact that the autooatisoht control and control device 6 without essential modifications can also be used for cutting and trimming saws in which the son's head on Sohitnen or the like. Is mounted so that it is either horizontally or vertically translatorisoht bin and Performs assessments.

In the usual Vtist, the tendon head is called ÄOtorisoh ttbtr the 3cn * tid- uad «ta Äöckbub tMMtft. The Moto »is hitr al · HjAnuliksyllnder 14 shows that you see wipes desi Kasobintnbttt 12 and dta longs id head 10 from tin tr Provides ttfindtt, which is tbftltgtn from dtr Oeltnkvtrbindunf 13.

VIt ui from 71g. i can see runs dlt sbtnt

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BAD OHlQlNAt

the Sägebandführungsrollen 9 of the cutting head obliquely to the direction of Hin "motion dee Sehneidkopfes · Bas endless SMgeband 8 includes swiechen the Banäführungsrollen a lower straight" Iruam whose Hittelteil 15 _V which includes the cutting wire of the saw blade, must be held in a plane which extends parallel to the plane of movement of the son's head during the son's oath and reverse stroke. The middle part 15 thus defines the cutting plane for the head that moves back and forth. In the case of aoBBaldaadaa, hold the issue old still below soapy tooth edge 16 su, aa cutting head frame 10 swel Säeeftüiruncen 17 are fixed. 3> ieae 8agaführuBean 17 act on the BÄband from gagaBttbavIiagaBdaB Indan of the cutting band parts * 1 $ behind the cream edge 16, ia tea baseband each cwi- • ahatt alaar Säfaftlhruaf and lar banaehbartaa MfeWndau tordi.aran * '

Jaa BiaafctKiaatt 1t *** & elae «Btaaaa baitatlaah 18, on la · 4aa au Bartellf» da aktaiUl la on «la Seaaeidebaae a« «aaaaaaaB« tviaa

kaaa. fiar fieoB 10 autmllt an "ikrmaia ra · fttai drahbaxaB great" or Walaan, which stops the workshop locomotive.

Bai dar Ib the laiohnuneen fratiB "ifaaM <-soHlna becomes fttr the aotorlsohas Toreohub iaji MsaftDatttakas

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BATH ORIGINAL

a slide 19 is used along the work table, on which a first clamping device 20 is located.

A second clamping device is provided stationary next to the cutting plane. The slide 19 is along <3es' feed path defined by the work table 18 for the workpiece can be moved back and forth, so that the carriage 19 moves its clamping device 20 in front of and Return direction moved relative to the stationary clamping device 21 «

Since the drives for actuating the slides and clamping devices and their controls are known, they were not shown in detail, although a general explanation of the control is still given below follows.

In general, the carriage and the clamping devices are operated by motors, which generally are designed as hydraulic cylinders, but just as well be pneumatic or electric drives can. The limit positions of the slide are determined by Limit switches, not shown, or the like. Set which can be adjusted along the slide path can. When the carriage reaches the retract limit position, it actuates a limit switch which is a

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~ 12 -

further movement in the reverse direction is prevented and ensures that the clamping device provided on the slide arrives in a clamping position in which the workpiece to be cut off is held. After completing a cut and returning the When the cutting head is in a position in which the workpiece is released again, the carriage moves along its path over a previously determined path in the feed direction, the clamping device 20 vjobei Workpiece still firmly grasped and thus moved forward "

When the slide has advanced beyond the previously defined feed length, it actuates another limit switch. If this switch then responds, the machine control ensures that the slide movement in the feed direction _{5 is terminated in rapid succession}

21st

an actuation of the stationary clamping device in the clamping position for a movement of the cutting head in the cutting direction, for an opening of the clamping device 20 on the carriage to release the workpiece and for a return movement of the slide to the retraction limit position ο The control ensures that the stationary clamping device 21 during the entire cutting = stroke of the cutting head da3 holds the workpiece until shortly before the moment at which the slide starts the feed movement »

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- .15 -

The east and control device 6 of the invention, the the machine control in the following to be described Assigned manner, there is also a! Aster 26, which detects the presence of the workpiece in the area of the Cutting zone responds «, The button 26 is on the cutting head stored or at least mounted so that it moves together with the cutting head. He is in an area near the son's oath zone and protrudes into the workpiece feed path that the work table 18 defined · The probe extends across the feed path and is in a normal position "if none There is a risk of a collision between the workpiece and the cutting head in this zone If there is danger, the button responds to the presence of the workpiece in the button zone, and then to ensure that the sensing and control device Provides output signal with which a return movement of the cutting head and / or an interruption of the feed of the carriage 19 is triggered

The sensing and control device is activated during the movement of the cutting head separated in the cutting direction, but on At the end of the cut switched on again, so that the sensing and control device automatically starts the return movement again of the cutting head over such a large stroke can cause the saw band to straight away from the workpiece is released again.

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In the case of machines with automatic workpiece feed ₀ as described above, the zone in which the button is arranged is located in front of the cutting tool in the feed direction, so that when a new workpiece is moved forward into the cutting plane and when the son's head is in one position »In which a collision could occur, the! Probe can detect the workpiece before it hits the cutting tool. The resulting output signal can be used to stop the feed slide and also to initiate a return movement of the cutting head »

Thus, the push button may be responsive 26 any on workpieces cross-sectional shape _P it is preferably designed so that it detects the presence of workpieces along a straight line extending transversely extending over the work feed path and to the cutting edge 16 verlaufto parallel the saw blade This scan line moves with the The cutting head and iBt are arranged opposite the cutting head in such a way that a distance from the feed path is always maintained, which is preferably slightly smaller (but never greater) than the distance that the cutting edge of the saw band has from the feed path.

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docile behind the cutting edge of the saw band when the cutting head moves during the return stroke _o This ensures that the cutting head remains away from the workpiece while maintaining a reasonable safety margin.

In the embodiment of the invention according to FIG. 11, a photocell 30 in front of a light source 31 serves as a button 26. The two components 30 and 31 are attached to the cutting head opposite the path of the workpiece feed. The light source and photocell face each other and have lens systems _p that ensure that the light from the light source is sharply focused on the photocell.

The light source and the photo ropes with their radiation axes form the aforementioned straight line, which is traversed by the workpiece advanced via the feed path when the cutting head is in a Is in a position in which the workpiece cannot move freely past the cutting head »The photocell 31 is connected to the control of the machine in such a way that an interruption of the light beam incident there causes an output signal through which the cutting head receives a return movement and the workpiece feed is temporarily interrupted «As soon as the full light

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If the beam of the light source falls on the photocell, the control then interrupts the return movement of the cutting head and initiates or continues the workpiece feed © s _o

Since the photocell 30 can be deceived by dirt and light sources from outside, the OFF = ·. Execution of the invention according to 2Pig ₀ 1 to 10 to be preferred in many cases. In this embodiment, the button 26 consists of a fairly rigid angle lever 35 with a front arm 36, which is designed as a slender _ff elongated blade and serves as a sensor, and a rear arm 37 which cooperates with a changeover switch 38

The angle lever is pivotably mounted on the cutting head in the direction of the forward and backward movement of the cutting head. The front arm 36 of the button is moved in relation to a normal position in which the straight lower edge 39 extends along the above-described tactile line. The button lever is preferably also relative to the normal position can be pivoted in directions that extend parallel to the feed _{direction of the workpiece 0} The pivoting in the directions of the cutting head movements enables the response to the presence of

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pieces within the son's oath zone «The pivoting movement in directions parallel to the feed path enable touching and responding to the front end of a new fed workpiece section in the direction of the cutting plane *

The switch lever is biased towards the Hormalstellung resiliently »wherein the biasing forces are so out ^ ₉ selects that the front arm of the probe in the direction of cutting movement of the head and opposite is pressed to Werkstückvorselmbrichtung"

The angle lever 35 and the switch 38 are located on a fixedly attached to the cutting head frame Bracket 40, which is always on one side outside of the workpiece feed path o On a vertical wall A block 41 is attached to the bracket in which a substantially perpendicular pin 42 is mounted which forms the fulcrum around which the button lever can swing in directions that extend parallel to the workpiece feed direction forked yoke 43 is attached to the lower end of the pin 42. The central pivot point of the angle lever 35 is in the legs of the yoke, so that in this way the button lever around the axis of the Pin 42 can pivot., For pivoting in

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Directions of the cutting head movement is the stylus lever 55 let yoke 43 be mounted with a horizontal pin 44 which bridges the legs of the yoke and also passes through the pivot point of the lever »The axis of the Sapiens 44 intersects the axis of the vertical tenon 42.

33 vertical pin 42 still protrudes beyond the bearing block rad carries a radial arm 45 there * This? Arm 45 is supported on a thrust bearing 46 from which _s is arranged between the arm and the bearing block isto In this way, the Ana also ensures that calibration of the vertically © pin 42 can not move down "the learner Ann. 45 has the task of exerting a torsional tension force on the vertical pin, which is supplied by a spring 48, which surrounds the upper part of the vertical pin as a helical spring and is fastened at one end to the bearing block 41 and at its other end to the arm 45. The 3? Eder 48 pushes the button lever 35 in such a direction that the front arm 3 swivels in the opposite direction to the workpiece feed direction under the influence of the Krsf'c of the leather 48 to limit, the screw 49 is set so that the lever comes into the U normal position _?

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2735822

in which the straight lower edge of the aster arm 36 is parallel aur the cutting edge 16 of the saw blade runs

One end portion of the horizontal pin 44 protrudes from the one side out of the yoke 43 to receive the turns of another coil spring 51, the opposite Ends with yoke and lever are connected to. To transmit torsional forces. The one exercised by the pen Pre-tensioning force swivels the probe arm of the Winkel = hebeis in the cutting direction of the cutting head, i.e. in this case down. The movement of the lever beyond the normal position by the Pederkraft is controlled by a Stop screw 52 that is screwed into the rear ceil dee yoke and at the top of the rear arm 37 of the angle lever comes to rest ο

The changeover switch 38 contains a for its actuation Push button 53 with limited travel between protruding and depressed positions. The switch 38 is on Bracket 40 so attached "that the push button 53 is down shows and is directed to the rear arm 37 of the angle lever 35 ο

For the transmission of motion between the angle lever 35 and the switch 38 is a leaf spring 54, which ensures that 3ede movement of the lever in the direction of the

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Normal position or in the direction out of the normal position brings the push button 53 of the switch into one or the other predetermined position. One end 55 of the leaf spring is firmly attached to the bracket ^ O, while the other free end part forms a FXcraeoh 56, dor raioh over the rear arm 37 of the bell crank below the Sohalterbetätigungsdruckknopfes in vjesentlichen perpendicular to the axis of movement of Druoklmopfee extends. in üev "liormalstellung of .iFlanschee 56? in which the leaf spring is pretensioned by a slight © bend, de :? Switch .betätigungsknopf the opportunity in the extended position to gelangend The Biegevorspanmmg the leaf spring, however, the attack by the YorSpannkraften the Torsionßfedern48 and 51c on the lever 35, overcoming v / ground _o If the angle lever look into 0s! Formulaic position _is? its rear arm holds the flange 56 in a Lsge _f in which the switch actuating button is completely pressed in. In addition to their! Flange 56, the leaf spring has an inclined part 57 _f of the flange extends obliquely. The rear arm 37 of the angle lever has a correspondingly inclined shoulder part 58 which comes into contact with the inclined part of the leaf spring when the angle lever is in the formula position Can pivot the angle lever, results from each movement of the lever from the normal position

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₃ that the leaf spring relaxes and its flange bends downwards, so that the switch actuating button emerges. Imopf depresses

Fig. 10 shows in a simplified and schematic way the main components of the control of the racing and cutting nage including the connections of the bracket 38 of the Sp ₁ St = and control _{device 6 O} An election controller 59 determines whether the machine is in the cutting phase of its work or in the transport _{phase p is} in which the cutting head 3 executes a return stroke and the feed slide executes its advance. Even though the V / ahlsc'naltcr is shown as a changeover switch for the sake of simplicity, it goes without saying that in practice this switch is a little more complicated and contains relays or derglo that are connected to the limit switches Movements at pre-defined points activated There is also a connection to a cutting head limit switch 60, which is activated by the cutting head when the cutting stroke is complete, and to a synchronizing device which coordinates the movement of the various drives.

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Ba the ■ yerschiedenen component Waue connections _s include the au this control _s are bskannt per se si © were only shown ia FIG, 10 as Heehteeke ,,

If SiOH eggs selector 59 position in OCE Schneidpbarjen- "of Masehinensyklus is ,, as thirty _e 10 geigts completed 3ie I sieve with a circuit. üsn © ntsprselienden Sohaltelemeßten on properly kiit actuation of the stationary h tang 21 in the chip division, actuation of the: arranged on Ö ^ ra Sehlitten spammssriontimg 22 iis the open = position, termination of the Sehlittenrücklaufhub @ 3? md moving the cutting head over the tendon id fetsfe "It's about 'beachtenρ sat the Sarfe = and control device not β in the above"-described circle lisgt "in the © example, the device 6, the movement dos cutting head during the cutting do not disturb" even if the angle lever 35, by contacting the Wericßtü- ok lay outside the formality

D @ r Scteaifikopfsiaasofealter 60 brings the selector 59 others in selas setting ₉ sobslä the cutting head the Snfle ä @ s cutting stroke ®rr © ie "at has" Ib that other Sehaltaistand.des Wahlsehalters fsr ^ ollständigt B ± oh one in which the Sehaltax- 3S äes almost «and control-β lies maä f © sm®i ⁾ mu @ h further sehalt elements

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lie sur Ko ore! In leaning the forward movement of the carriage _s confirmation of the clamping devices 20 and 21 and the back movement of the cutting head. At the end of the first cut over a profile piece to be distributed, the Easter arm 36 of the lever 35 is acted upon by the workpiece and held outside the normal position _P so dsß the switch 38 is in a position in which a correspondingly generated output signal causes the cutting head to move backwards and prevents the carriage drive from being put into operation , the angle lever 35 comes into the! formalst el development so that the switch 38 comes to the other switch position ₉ in the oin output signal can be generated that the carriage is inserted and the movement of the cutting head prevented

IPig. 6 explains how the inventive Säst = and Control device the return movement of the cutting head Dorart says that the movement stops as soon as that Rügoband is released from the workpiece, namely released, regardless of the shape and size of the workpiece, Yorsugsweiee the control device is designed so that the cutting head only performs a very small overstroke,

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6ADOBIQiNAt

so that the laster arm 36 and also the saw band from the workpiece is released, and. the workpiece in front of the truck cannot drag out of the IT normal position.

From the above description and the accompanying Drawings was recognizable to the person skilled in the art that the invention was an automatic system for racing saws and cutting saws disclosed, with which the presence of the workpiece in or near the son's oath zone is scanned to then use this scanning to control the movement of the cutting head of the machine in the rearward direction in such a way that that the cutting head is not unnecessarily far removed from the workpiece, but remains close to the location in that the workpiece can move freely in relation to the son's head. It also emerged from the description, that in a cutting and trimming saw with automatic workpiece feed, the load and control device according to the invention can prevent the workpiece feed until the cutting head is raised so far that no danger whatsoever there is damage to the saw from the material running ahead.

for those skilled in the art it is also clear that the invention is not is limited to the embodiment described above and shown in the drawings, but in the The scope of the following claims can be modified.

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Claims (6)

· «· 25 claims. 1. ) Cut-off or cutting saw with a workpiece to be cut up and its feed direction determining the workpiece support and a cutting head which is motorized relative to the workpiece support and has a motor-driven saw blade ₉ which is guided with its cutting edge in a cutting plane extending perpendicular to the feed path, characterized in that the drive for the return stroke of the cutting head (7) is controlled by a button (26) which is moved together with the latter parallel to the cutting plane and which defines a scanning line (39) extending at a short distance from the saw blade cutting edge (16) If a workpiece is encountered, the return stroke drive of the cutting head (7) switches on and, without workpiece detection, switches off the return stroke drive and prevents it from being switched on. 2. Saw according to claim 1, characterized in that the feeler is arranged on the scanning light barrier, which side of the workpiece feed path, affixed to the cutter head (7), photocell (30), or · a light source (31) (Figure ₀ 11) . 209810/0265 3 · Saw according to claim 1, characterized in that the button is a button attached to the cutting head (7) and in The swivel arm (35) which can be moved in the direction of the cutting and return stroke is »which in the cutting direction in a Normal position is biased (51), in which its lower edge (39) defines the scanning line, and that on the swivel arm (35) a switching device (38) is attached, which in one position the return stroke of the cutting head (7) switches on and prevents the return stroke from being switched on in the other position. 4. Saw according to claim 3, characterized in that the button swivel arm (35) is a two-armed lever whose front arm (36) defines the scan line (39) and the rear arm (37) of which contains the switch actuating means ^ - (53). 5 * saw according to claim 1 to U _9, characterized in that the faster relative to the workpiece vorehub is arranged in front of the cutting plane. 6. Saw according to claim 1 to 5 »characterized in that the button swivel arm (35) is also parallel to the Feed direction pivotable and in its normal position is biased in a direction opposite to the workpiece feed (48).
209810/0265 7 «saw with automatic, motorized workpiece feed according to claims 1 to 6, characterized in that the button at. Detection of a workpiece » which is outside the free profile of the saw switches off the workpiece feed. 209810/0265