DE2024032A1 - Automatic device for loading automatic lathes with round or profiled material bars - Google Patents

Description

PATENT LAWYERS

V DR, ING. KARL BOEHMER? ■ · DIPL-ING. ALBERT BOEHMERT XSB BREMEN, FELDSTR. 24 s N (043]) «444081

Fabrique de machines Andre Bechler S.A., Moutier (Switzerland)

Automatic device for loading automatic Lathes with round or profiled material bars.

The present invention relates to an automatic device for. Feeding an automatic lathe with round or profiled material bars, the respective Introduction of a bar of material into the automatic lathe a plunger takes place starting from a holding position, in which the material bar was previously brought and in which the front end of the material rod at a removable stop rests.

If you want to achieve the best possible working conditions, the introduction of material rods is required precise positioning in an automatic lathe the bar of material in the spindle piece as soon as the first machining cycle is initiated in the automatic lathe front end of each newly introduced bar of material previously faced worcj-ejfr-'is.t, that's how it is possible, this material rod up to the stop on one To advance the parting chisel. This approach has but the first disadvantage is that they require a previous facing of the one material rod end requires, and a second disadvantage stemming from the fact that if

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008112/1381

Even the first workpiece is to be machined exactly within the tolerances, it is necessary to bring the irar-machined end face of the newly introduced material bar exactly to the stop bar! in this case, however, there is the risk that this stand-off steel is easily damaged or displaced a little. It is therefore of prime importance that the position which the anterior material rod adopts during the introduction can be determined with rigorous "precision" by the organ which is responsible for the insertion of the material rod behind the spindle. Another method in which the first machining ₉ enables the introduction of material rods - the front face of which has not been previously b © art @ itet. According to this Method®, the material rod is inserted in such a way that its front end does not come into the immediate vicinity of the parting tool comes | in the first "machining cycle" then only the bar actually comes into effect, with the purpose of turning the front end © of the material rod flat. With this method ©, however, a fairly exact positioning of the not yet faced front end of the Rod, which cannot be done using the parting steel as a stop "

In both other case it requires a Besöhickungsvo ^ richtuiig, ate capable of directing Warlsstoff "rod so ^ ₉ Mention should that der®n front end © in® as precisely certain lag © occupying · In the conventional charging devices is

-by means of one! Stbssels introduced, which affects the material rod® © | ea but fuel rods is not exactly the lusarnw gleiste that the Bestimßäffig

on the rear end aie Ling © et © i> Do not work. stalls the lag © of this ram rather, mass di © Lege der WeÄatoff st aage In •, the position of the 3 front V / ey & st © ffstangensndes

009982/1381

In certain known devices a mechanical button, e.g. in the form of a microswitch, is provided, which by advancing the material bar the push rod the arrival of the front end of the rod 'on perceives a certain position behind the headstock, whereupon a mechanism, usually one who works with friction, a rod of material around one advances a predetermined amount. This procedure is not particularly precise because-the operation of the button-through the shape of the front material affects the face is flowing und.well, even if this surface is in advance was planned, the operation of the button ete-eih ■ the speed is influenced * with which. «21 © Material bar on the. Button has reached Si-nwirlKsng »

An already known improvement is the. Using a removable stop) abuts against clem the front © face "the advanced by ümi StGssei material rod, whereupon he AnseMag is removed to make it .su eicem suitable MfechanisEUg. Allow the material starige dur" sa-Einwirkung- on ueen.-St8ssei by a predetermined amount vorsiusehiefoon · ...

Όθίζύ t with such a mixture of oils complete precision is achieved. -die srwsrtet ■ «eröea fesfsij. -iFuss-the means, - the the. Merkstoffstab «a eiaea 'tcir» »■ should advance a certain amount _$ with gTÖssim? frtlsi— 5ion .work * The plunger w: tr * ä at most advanced by means of ais ^ s '' ■ cable, which ■ is attached to ■ a Fatoe-this SiEtiSi-eis ■ you known * ^ üirlclitiaagea-wiTfee !; on this cable ndtteis eirtweier elß «? Friktioßsroll ^ j.dia .- acts directly on the cable ', or · by means of a. . ■ Coupling mechanism ι which is used in the drive unit of a cable drive pulley * ¥ egeEi i3ei · elasticity of the labeis and due to the UagaiiMiigs that 'in the effect, every frlktioäsworrlcsiätiiaf .. assa "is met, this advancement can, however, be ndii-

with the desired accuracy. In known Beschiokungsvorrichtungen one has therefore provided a slide, which can move parallel gum plunger and which is provided with grippers, which grasp the pushrod immediately after pushing the material bar on the stop in order to carry out the push for the desired path after removing the stop and finally release the plunger rod again, "There was therefore the view _s öass to achieve a sufficient feed Presiding Sion with _it? to advance the plunger not by means of a cable but by means of a part rigidly connected to the plunger, namely by means of a fler push rod.

Devices of this type have been built and have been fully approved in this regard, but have a rather weighty disadvantage which is that because of the small, hanging plunger flag, the stop position in which? The front EMe of the material rod against you detachable stop and from which <3 © r carriage by means of the gripper pushes the ram uai forward the precisely determined amount within a limited range g@leg.eo its inusgg flies means ₉ that you can only work with Maria's fcof fit tightness ₉ their length must located within a "narrow siem borrowed Toleransbereiches s © ia imss ₉ of hdelist @ ns derf be several decimeter and not big ² to be the Läng © OCE This © isribeäiLagt einsplialteßöe condition forbade

dl ©? BeeehieicuEgs ^ oiP ^ lehtiinig with ¥ © rkit © ffstangen ₉ i3e: «ii Llag © © r-lieblieli kl @ isi © r is ®li elae certain © lerai = Illiiges line Alliiif © iMf® M © j? ia ^ iffeh SiSgUaIi ₉ ä © is mm tue Laug® am? tStöggelstang © in excessively large provides for this! latte but © inen excessively large a space required euf follow., because for oils EioftiiifMag jeel ©? Merk it off rod fler impact sol Ms la sola © Mater ste Lag © inyüeÄckoiman »isg imd thus, © lsi © ¥ © i \ f A ³ ö S ^ i ³ IMg i @ s? St (Os self ata © near behind

there would require additional space if required.

The purpose of the present invention is to provide an automatic loading device for an automatic lathe with elimination of the aforementioned disadvantage, so a loading device that without An increase in the space requirement makes it possible to work with material bars that are any length up to the nominal length to have.

The inventive automatic loading device solves this problem in that the plunger ^{is connected to a GaIl 1} see chain, which, regardless of the position of the plunger, has a strand that extends along a distance that is fixed in relation to the device, along which of the chain connected tappet part is movable, it being ensured that each movement transmitted to the chain within a predetermined zone of the chain course which is fixed in relation to the device is transmitted integrally to the tappet for the corresponding forward movement of said chain strand, and that it has means that allow it make it possible, following the removal of the stop that was effective in front of the material rod, to give the feet within the named zone a feed movement, the amplitude of which corresponds exactly to a predetermined length.

A preferred embodiment of the charging device according to the invention is further characterized in that the feed movement distributing means are one. Have carriage, which is movable within the said zone, which is "located on the said route and has an extension _} which is at least as large as the said predetermined length · where. · This carriage is equipped with grippers that are attached to a chain for Engage as soon as the material bar has reached the holding position, in order to then follow

008882/1381

Removal of the stop to execute a translational movement over the distance that corresponds exactly to the predetermined length _% while driving the chain ₅ and releasing the chain by al® gripper * when the transitional movement is controlled »·

Dia hereby proposed © solution is based on? the Srkemitiiis that contrary to what was previously thought j a © figure äse determining the amount bsi the iei ^s ram advanced wi? d ₉ is not a 'Vorstosswirlrang requires ι exerted on a fully dependent StcSsseX part but *' that feann this Yorstosswirkung also be exerted on one or more parts of _s which are rigid per se well ₃ but which directly or indirectly play ata plunger slnd§ articulated wherein also the condition be met needs in that the kinematic connection between the movement of the rigid articulated part and the resulting »Stöss @! h @ w®gung must be precisely determined. This last-mentioned provision is complied with by the use of a GaIl ⁸ see chain j the same condition would not be complied with to the desired extent when using a table ₉ since such a table always has a certain flexibility uxiel does not consist of all parts.

An embodiment of the subject matter of the invention and. one version of the ifes? d @ n variant below with the aid of the accompanying drawings «It shows"

Fig. 1 shows a se-hematiseise perspective © the

Fig. 2 shows a schsioatisehe usagi

Fig * 3 an Aiafs? Iss ü <&&

hearing © »§®ftlltt® ₉ Fig« 4 © in © »fertifeelsetmltt» iieli d © r

! ¥ *! ¥ der

00Ü82 / 13S1 ■ ^{0BIG! NÄL}

In Fig. 1, 1 denotes the headstock of an automatic lathe, 2 denotes a work spindle mounted in this headstock and 3 denotes a cutting tool, for example a parting tool * These parts work together in the classic way! in that the spindle 2, in which a material rod is held, rotates in the headstock 1, which moves longitudinally, whereas the chisel 3 and possibly other similar chisels, not shown, can be moved radially in order to carry out a parting operation and any other machining operations! In other types of automatic lathes, for which the loading device described here is also suitable, is the headstock 1 stationary, whereas the chisels are moved both in the longitudinal and in the transverse direction _? to give the workpiece the desired shape. This working method is well known and it is therefore unnecessary to go into it in more detail «

In Fig. 1, a material rod 4 can be seen, which is by a pusher 5 (which is still separated from the material rod 4 in the drawing, but which will grip the latter at the rear in order to push it forward and also when it is approximately completely used up Material rod remnants for its replacement by fresh material rod), the material rod 4 and Äer ■ ram 5 are located within a tube _f as is usual for known loading devices, which is why this tube (guide tube) is not shown in the drawing not to be overloaded. The plunger 5 has a flag 6 which protrudes from a lateral slot of the aforementioned tube, not shown, and on which the means for advancing the plunger and thus the material rod act. A magazine plate 7, on which a plurality of material rods 8, 8a rest, is located next to the aforementioned tube and an also well-known and not shown selection device ensures the introduction

000882/1361

a new bar of material every time it is used up a material rod of the plunger completely to the rear has been returned »

The ram 5 is moved by means of a GaIl's see chain 1O ₅ , which is connected to the flag 6 and revolves around a deflection chain wheel 11, a drive chain wheel 12 and a tension chain wheel 13; the latter is mounted on an arm 14 on which a spring 15 is attached The sense of tensioning the chain 10 acts. The drive sprocket 12 is driven by a motor 17 by means of a friction clutch with disks, which has the consequence that the part of the chain surrounding the sprocket 12 is always pulled counterclockwise, but that if the chain cannot respond to the train, it remains stationary and grind the clutch disks 16 against each other. It should be pointed out here that a similar type of drive could be implemented - and is also implemented in certain rotary machines - by means of a weight that looks at the chain 10 to push the plunger 6 forward. It should also be noted that the motor 17 either always can be fed or only when the plunger to move forward ist§ It does this, only the conventional electrical switching means which are not described here in more detail below * AiAF Fig »1 one sees a wegnehßibarea stop S ₅ by means a mechanism, not shown, which in accordance with the various phases of loading a material rod alternately in the path of a material rod to be inserted into the work spindle 2 and then can be removed from this path again _{9 in} order to let the material rod through *

The first Phas © the operation of the above-mentioned Elementej which are well known in their majority, the following is briefly described

2/13

As soon as the plunger 5 fully backwards withdrawn and temporarily detained in this position and after the rest of the used material bar has been removed, a fresh bar 4 of material from the supply 8, 8a passed through a dialing device, not shown, so that they are within the aforementioned and not shown The guide tube in front of the plunger 5. At now temporarily held by aids not shown Material rod is now the plunger 5 moved forward, by means of the chain 10 or by others Means acting on the flag β until the rotatable front end part of the pusher 5 reaches the rear end of the material rod has grasped and clamped it. Then the aids are released, which temporarily the Have held the material rod in the axial position and it the ram 5 is moved forward until the front end of the material bar hits the removable stop 9, which has been brought into its real action beforehand. The holding position has now been reached from which the Material rod 4 moved forward by a rigorously precise amount shall be.

It should also be remembered that during this first work phase, the upper run of the chain is always kept taut by the sprocket 12 and the slip clutch 16. As soon as the above-mentioned holding position is reached, the control of the sequence of processes for inserting the material rod) is taken over by the slide. Is this carriage, which is described in detail below, set up _? to move lengthways: that is, parallel to the ram 5 and to the material «; rod 4, covering a path, s, which corresponds exactly to the •, - desired path absohnitt.

As soon as the holding position is reached, weä this carriage 18 before the start of its forward movement

008882/1361

- ίο - ■

steered there _? that it moves two grippers 19 and 20 against each other, between which the chain 10 has hitherto been able to move freely. As soon as these grippers 19 and 20 (or these pliers 19, 20) have acted on the chain 10, which is a Gall's chain, the movement of the unit consisting of the rod 4 and plunger 5 is linked to the movement of the slide 18 bound. The stop 9 in front of the material bar 4 is then removed. Then, under the action of means to be described, the carriage 18 begins its forward movement, taking along the chain 10 and thus also the plunger 5 and the material bar 4 by exactly the same amount as the latter The amount is precisely determined by the means provided above, and the path covered by the ram 5 and the material rod 4 is also precisely determined.

As soon as the carriage 18 at the end of Fiineg feed path has reached the front end of the material rod 4 go through the length of the headstock and stick it out the work spindle 2 against the chisel 3 ¥ or. At this moment the classic means come into play, which in the Spindle are included to hold the bar of material in it and at the same time the grippers 19, of the carriage 18 are detached from the chain 10, whereupon the slide carriage returns to the starting position from which he will be advanced the next time by a precisely defined amount of travel »

In the Fig® list aueti a rail 21 can be seen, along which 'de? Is guided carriage _s and ein® chain 22 which is used for the SSW-© took itteias B and DI® a nose wheel 23 and rotates in © Jkntriebaketteeracl 24? that. with a · motor 25 in antytabs connection »A J & mtakfc, indicated söhematically at 44, controls the attachment of the slide 18 to the rigorous g®mma bestissafeen SfceUeg © s are versetilepte individual methods the @a @ rXaub @ a üm Mnür · 'point from the 'Schlitten 18 s «pimped © n lie g © naB © steas to be determined»! there such, © method. Im β! Κ ^ © 1π © η beksnnfe

does not need to be discussed in more detail here.

With regard to the device according to FIG. 1 is still to point out that the point at which the chain 10 is gripped by the grippers 19 and 20 of the carriage 18, could be located on the upper run of the chain 10, on one other than that shown in the figure. If no special instructions are given, this point should be used do not lie on the lower run of the chain on which the tensioning roller 13 acts, on the other hand it would of course be in an analogous manner Execution forra easily possible that the effective chain strand run below and the tensioned chain strand above would.

In Fig. 2 one has shown schematically the installation between the path covered by the carriage 18, more precisely by the grippers 19, 20 of the carriage, and the path that the material rod must cover, starting from its holding position, in order to reach the desired position Able to get in relation to the chisel. This FIG. 2 clearly shows that the path A covered by the slide is exactly the same size as the path A that the front end of the material rod has to cover, starting from the holding position, until it has reached the vicinity of the chisel 3. If you do not work according to the method with the first working cycle in the void, the path A must be exactly the same size as the distance between the effective surface of the stop 9 and the closest point öes Meisseis 3 * If you work according to the method with the first working cycle in the void, so -be there is ββτ chisel at the point 3 «§ the path A must then be equal to the distance between the effective surface of the stop 3 and the closest point of the chisel reduced by the amount x, which has to be slightly smaller than the length of one to processed workpiece.

On Fig. 2 the elements 1, 2, 3, 4, 5, * 9, 10, 11, 12, 19 and 20 shown so that the agreement between what is shown in Fig * 1 and what shown in Fig. 2 is clearly apparent.

009882/1381

3 and 4 illustrate the carriage in detail. It can be seen there that the mutual adjustment of the grippers 19 and 20 is controlled by a magnetic mechanism _{s to} which a plunger belongs, which acts in a bobbin 26 and is connected to a shaft 27. The latter is at its end on the left in FIG. 3 with a sleeve 28 fastened thereon, which is secured by a counterpart 28a and has two flanges 29 and 30, which also have an annular groove 31. A compression spring 32 is inserted between the flange 30 and the part 26 a belonging to the bobbin 26. The coil body 26 is attached to the slide body by means of a threaded projection 26b and a lock nut 26c. When the coil body is de-energized, the shaft 27 and with it the sleeve 28 are pressed to the left, whereas when the magnet is energized these parts are moved to the right. A bolt 34 engages in the annular groove 31 and is fastened to the free end of an arm 33 mounted on the lower part of the carriage by means of an axis 35. At its end facing away from the arm, the axis 35 has a head 36 with a flat area, which serves, as it were, as a cam disk for actuating the gripper 20.

The two grippers 19 and 20 are guided in a vertical slot guide, on which the chain 10 facing back side of the carriage is present "In this setting, the upper gripper screw 13 by means of a square head ™ set 39 and a washer 40, the screw a The lower gripper 20 is held in contact with the bottom of the link guide by a pin 37 so that this gripper can be moved up and down * The lower band of the gripper 20 rests on the flattened part of the head 36 which its operation serves.

The Gail ¹ see chain 10 extends check in oiler manner between the grippers hintaeh _s that the teeth 41 and 42 of this latter at least at three ZwischenMlsen this chain move to action. This happens with the under -

009882/1361

Current setting of the solenoid 26.

In FIGS. 3 and 4, the rail 21 is also shown, which is used to guide the slide.

The electrical device for controlling the power supply to the solenoid 26 is not shown j it suffices to point out that the closure of the feed circuit in Adjustment to the movements takes place, which the different Elements that control the functioning of the automatic loading device «Die Herzu required means are known and have been used in similar loading devices in which the gripper of the slide does not close on a chain 10 or a similar organ, but on a flag that goes to the Belonging to the plunger 5, such a flag must then be considerably longer than the flag 6 which is attached to the plunger 5 according to FIG. 1 is attached.

The advantage of the loading device described here over those that are briefly described above was that they were both with material rods 8 can be fed, the length of which is approximately equal to the nominal length, as well as with material rods 8a, the length of which is considerable is shorter. This results from the fact that wens the ' the plunger 5 and that held therein with its rear end Material rod 4 existing unit in the holding position has been brought, the position of the plunger 5 and thus of the flag 6 depends on the length of the holding position brought material rod depends. It's easy from Flg. 1 it can be seen that if e.g. a kuize material rod in: The plunger is held, the latter is in the holding position is much closer to the headstock 1 than when a long bar has been inserted. Would with a previously known If such a short rod is inserted into the device, the grippers 19 and 20, when actuated, would ini Grasping emptiness or coming to rest on a cable without thereby guaranteeing an exact transfer of movement to the flag to be able to * With the device described here,

009012/136!

on the other hand, the grippers 19 and 20, regardless of the length of the bar of material used, always grab a number of Distance aids of the chain 10, whereby there is a guarantee that the movement of the carriage 18 precisely on the flag 6, thus transferred to the plunger 5 and to the material rod 4 used will.

In the embodiment described, the chain 10 is self-contained and endless by one of its pivot pins connected to the front edge of the flag 6 · In a variant, the ends of the chain could be at the rear and front edge be attached to the flag, in which case, however, the flag would have to be designed in its longitudinal profile in such a way that it relates to Attack of the grippers 19 and 20 of the chain would be equivalent

In another variant, one could get by without a carriage 18 and the movement of the chain 10 could be done by a sprocket wheel in engagement with it.This sprocket wheel could, for example, join the chain of the toothed wheel and its teeth would have to be designed in such a way that the engagement is free of play he follows. Such a chain wheel could then be used in order to transmit a movement to the plunger 5, the amplitude of which is precisely determined, specifically with the amplitude A according to FIG. 2 overlaid with _e

The drive mechanism for this gear could be have an electromagnetic clutch that is used arrives after the bar of material held in the StoßX has been brought into the aforementioned * detention & teliung 1st and the then this gear with one of one! Motor driven Part in aluminum drive connection brings * This motor can © then jj preferably be a sobrittnotox * with sete capital ■ <: UebersetzungvferhäXtnls on the just ge & iaimjssn driven ι

f j

Act part? would _f in such a way that stecA Siitspsung _γ -j a deliberate view! from Irapuls © n m this SohFittmetor * * j. the driven® part and sooit on the danit in standing gear

ORIGINAL

Angle would get the one accordingly very precisely would correspond to a certain path of the plunger 5. It would be also required that the coupling, e.g. the electromagnetic Coupling establishes the drive connection between the gearwheel and the driven 3? Part as soon as the The material rod 4 held in the plunger 5 is the holding position has reached, so that when the stop 9 is removed, the chain is held by the coupling device in order to prevent the plunger from starting its advance movement under the Action of the slip clutch 16 and the motor 17. Sobalfi the stop is removed, the lacing could then the impulses are sent to the stepper motor to drive the plunger 5 and the associated © material bar around the wanted Feed path to advance *

In a further variant, the one just described could Coupling device can be combined with the drive device for the sprocket 12, then this Sprocket 12 the wire that is used to effect the exact measured feed path is used, while preferably the slip clutch 16 and the motor 1? replaced by a weight motor and the electrical coupling device would take the place of the slip clutch 16 and further the stepper motor the motor 1? would replace (being again a reduction device would have to be provided in "the sense, There is a provision of the chain corresponding to one Step of the motor would be very small to the precision of the To enlarge the feed movement En ά £ β chain accordingly) ·

G09882 / 138t

Claims (3)

PATENT CLAIMS: f 1.1 Automatic device for loading an automatic lathe with round or profiled material rods, whereby the respective introduction of a material rod into the automatic lathe is carried out by a ram starting from a holding position in which the material rod was previously brought and in which the front end of the material rod rests against a removable stop , characterized in that the plunger (5) is connected to a GaIl ¹ see chain (10) which, regardless of the position of the plunger, has a strand which extends along a distance that is fixed in relation to the device, along which the with the Chain-connected tappet part is movable, it being ensured that each movement transmitted to the chain within a predetermined zone of the chain course which is fixed in relation to the device is transmitted integrally to the tappet for the corresponding forward movement of said chain strand, and that it has means which make it possible, following the removal of the stop (9) that was active in front of the material bar, to give the chain within the said zone a feed movement whose amplitude corresponds exactly to a predetermined length. 2. Apparatus according to claim 1, characterized in that the feed movement dividing means one Have carriage (18) which is movable within said zone, which is located on said path and has an extension which is at least as great as said predetermined length, said carriage is equipped with grippers (19, 20) which come into engagement on the chain (10) as soon as the material bar enters the Festhal test division has reached, to then after removal of the Stop (9) perform a translational movement over the distance that is precisely the predetermined length corresponds, taking along the chain, and letting go of the 009882/1361 I. Chain through the gripper when the translational movement is terminated. 3. Device according to claim 1, characterized in that that the feed movement dividing means in addition a sprocket wheel with which the chain meshes with no play at a point located within said zone stands, an electrical coupling device, which as soon as the material bar is in the holding position - the sprocket connects to a part that can be driven by a stepper motor, also an electrical one Has circuit which is set up to then follow the removal of the stop and the connection of the Chain wheel to feed a predetermined number of current pulses into the stepping motor with the drivable part so that this then over the chain wheel the chain over the distance that corresponds exactly to the predetermined length emotional. 009882/1361