DE2441974A1 - AUTOMATIC AND FAST WORKING THREAD CUTTING DEVICE - Google Patents

Description

25 743/4

DUPLOMATIC MECCANICA APPLICAZIONI OLEODINAMICHE S.ρ.Α., BUSTO ARSIZIO (VARESE) ITALY

Automatic and fast working thread cutting device

The invention relates to an automatic and fast working thread cutting device for the production of Threading on two parallel movement paths, which have a base for attachment to the slide of a lathe or a

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other .. machine ., a carriage or feed carriage, which slides in the longitudinal direction on the base and parallel to the surface line of the thread to be produced, and a tool carriage which slides with respect to the direction of displacement of the carriage or feed carriage at an incline.

As is known, when producing a thread on a parallel path, one or more passages of the Tool on the workpiece and after each pass the tool must be moved back and into its starting position for the next round.

The tool is shifted in the longitudinal direction, i.e. parallel to the axis of the turning spindle, and is due to the shift secured with the carriage bolt of the lathe.

Devices are used to move the tool mounted on the slide of the lathe and kinematically connected to the carriage bolt. These devices ensure the movement of the tool while the slide of the lathe is held in a fixed position.

In this way, with the device according to IT-PS 508 882, for example, the tool is displaced along the workpiece, both when threading and when resetting, namely with the help of a cam, whose Profile applied to a support segment on which the tool is attached. This loading takes place by means of a return spring. This cam is made to rotate while kinematically connected to the screw of the lathe

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Another cam lifts the tool off the machined part after each pass in order to reset the support segment and to enable the execution of the subsequent rounds.

The known thread cutting devices as described above have been described have advantages in various respects, in particular in terms of speed the cutting process, but they have the disadvantage that they are limited in their application. In particular it is only possible with the device working with a cam, as described above, to use threads Manufacture with a limited length, since the cam only shifts the support segment supporting the tool with a low amplitude, because otherwise the cam and the inclination of its profile would be inadmissible in practice would be great.

Another limitation of the known devices of the type described above is due to the fact that in order to transfer threads taken in metric dimensions to inch threads, it is necessary to replace the drive cam for the tool. Even if you are in metric system remains, a single cam also does not allow all the usual thread pitches to be executed, therefore replacement cams must be provided.

Such a disadvantage is reflected in the cost of the device, since it is generally equipped with multiple cams must be, for which the costs are not negligible.

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Accordingly, the invention is based on the tasks with With the help of a device that can be used on parallel movement paths To produce threads with a long length, the thread pitch of which corresponds to the metric standards or in inches is expressed in one or more passes.

This object is achieved according to the invention with a device of The type mentioned at the outset is achieved in that a reversible mechanism for converting a rotary movement into a rectilinear one Movement and vice versa is provided, which is connected to the longitudinally displaceable base of the carriage is and can be controlled by a carriage screw that a connecting element for transmitting the movement of the carriage screw on the reversible mechanism is provided, as well as a coupling part, which with elements for limiting the path for opening and closing the coupling part at the ends of the path of the slide cooperates, and that elements are provided for reversing the movement of the slide, which the slide regardless of the displacement of the rotary spindle after each thread cutting cycle return to its starting position, and that finally elements for displacement of the tool slide are provided.

Further features and advantages of the invention emerge from the following description of an exemplary embodiment the same with reference to the accompanying drawing. Show it:

Fig. 1 is a schematic view of the inventive Device and the corresponding mechanisms

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to transmit the movement of the lock screw on a parallel movement path;

2 shows a schematic plan view, partly in section, of the device according to the invention;

3 shows a longitudinal section through the inventive Device along the line III-III from FIG. 4 with the representation of the kinematic elements in an enlarged scale for a clearer representation ;,

FIG. 4 shows a section through the device along the line IV from FIG. 3; FIG. and

FIG. 5 shows a section through the device along the line V-V from FIG. 3.

The device according to the invention comprises a base 1, which is provided for mounting on the slide of a lathe (not shown). Slides on the base in the longitudinal direction and parallel to the surface line of the thread to be produced a slide 2, which "in turn is a tool slide 3 carries. This slide, slides in, transverse direction back and forth on the slide 2, so that the tool (Fig. 2) on the (dash-dotted line) working axis 5 can be approximated and moved away from it, or * more precisely said to and from the surface line 5a of the thread to be produced.

The tool 4 is mounted in the bearing 6 of the tool attachment 7, where it is blocked by means of the screw 8. This ■

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The attachment 7 is in turn on the tool slide 3 in
in a manner known to those skilled in the art.

The displacement of the tool slide 3 generally takes place at an inclination with respect to the plane of displacement of the slide 2. The inclination is normally between
+10 and -10 with respect to the direction perpendicular to the longitudinal displacement of the carriage 2. If, for technical reasons, it is preferred to move the tool slide 3 perpendicular to the longitudinal displacement direction of the slide 2, as will be described below, this can be seen.

The displacement of the carriage 2 on slide rails, which will be described in more detail below, is reversible Screw-screw connection ensured, for example by a screw connection with return by balls, or by any other reversible system, for example by means of a hydrostatic winch, or a Gear with a rack.

More precisely, the mother 9 is on in this connection
the slide 2> and is screwed onto the spindle 10, the axis of which is parallel to the slide rails of the
Carriage 2 or parallel to the surface line 5a of the
Workpiece to be formed thread runs.

The screw 10 is driven by means of a gear group with a different transmission ratio, for example by a gear group of known type, which under
the name "Tete de cheval" is known and a feast with

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the screw connected gear 11, an intermediate gear 12 and a fixedly connected to a first auxiliary shaft 14 Has gear wheel 13, the axis of the auxiliary shaft 14 running parallel to the spindle 10. Aligned to the auxiliary shaft 14 is a second auxiliary shaft consisting of a telescopic shaft having a hollow outer part 15 and a part 15b which slides in the element 15, the transmission of a torsional moment between the parts 15 and 15b being possible, Between the auxiliary shaft 14 and the part 15b of the second auxiliary shaft a positive coupling is interposed, which is indicated overall by the reference number 16 and in further will be described in more detail. The coupling 16 enables a connection and a separation between the auxiliary shaft 14 and the telescopic shaft 15-15b (Fig. 1). This shaft 15-15b takes the movement of the axis 17 of the lathe (Fig. 1) by means of a further gear group with different gear ratios, which one with the Telescopic shaft 15-15b connected gear wheel 18, an intermediate wheel 19 and a gear wheel 20 fixedly connected to the axle 17. As with a known arrangement ends this axis 17 in a transmission gear 21 for the Lathe (Fig. 1).

Fig. 3 shows the spindle bearings 10a and 10b of the spindle 10, which are attached to the side walls 1a and 1b of the base 1, as well as the shaft bearings 14a, 14b of the auxiliary shaft 14, the bearing 14b. is attached to the partition 1c of the base 1. Furthermore, Fig. 3 shows the support bearing 15a for the outer section of part 15b of the telescopic shaft. For the sliding movement of the carriage 2 in With respect to the base 1, two slide rails 22 are provided,

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which are firmly connected to the base 1, as well as two counter rails 23, which are firmly connected to the lower part of the carriage 2 (see. Fig. 4 and 5).

Between the slide rails 22 and the counter rails 23 are Sliding rollers 24 temporarily stored. This sliding system by means of roles includes elements that compensate for play or to Backlash reduction are provided. However, these parts are not shown as they are of a known type. The form-fitting Coupling 16 comprises a single pin 25, which over a conveyor plate 26 of the element 15b of the telescopic shaft protrudes, and at the coupling position a single pin 27, which protrudes forward over an element 28, which by means of grooves slides on the end 14c of the auxiliary shaft 14 (Figs. 1 and 3), which considerably over the shaft bearing 14b and the partition 1c of the base 1 protrudes.

About the coupling and the separation between the auxiliary shaft and to ensure the part 15b of the telescopic shaft, it is provided that the element 28, which carries the pin 27, can move back and forth on the end 14c of the auxiliary shaft 14, and that due to a fork 29 (see. Fig. 3 and 4), which by means of the fastening part 30, the shaft 31 of a piston 32 (Fig. 3) of a pneumatic cylinder 33 is firmly connected is, which in turn is carried by the side wall 1b of the base 1. The fork 29 comes with the element 28 in its annular groove 28a in engagement. The shaft 31 is guided at its ends by supports which on the walls 1b and 1c of the base 1 are provided.

The piston 32 delimits two chambers 34 and 35 in the cylinder 33,

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which successively communicate with the inlet and outlet for a pressurized fluid, around the piston 32 and with it the fork 29 and thus the element 28 in one direction or in the opposite direction Direction to drive.

If the chamber 3 5 is under pressure and there is a connection between the chamber 3 4 and the outlet, it shifts the piston 32 to the right (see. Fig. 3), so that the element 28 is also shifted to the right and with-the pin and the pin 2 5 engages.

In this way, the auxiliary shaft 14 is connected to the telescopic shaft 15-15b, and the movement can be from the carriage screw 17 to the shaft 14 by means of the gear 20, 19, (Fig. 1) and from this shaft 14 to the spindle 10 by means of the Transmission 13, 12, 11 are transmitted ¹ . The carriage 2 thus moves on the slide rails 22, 23 from right to left, with a pass for thread cutting being carried out, provided that the device shown in FIG. 3 has already reached the end of its path in the longitudinal direction to the right.

At the end of this cycle, the clutch is disengaged as follows will be described, whereby the pressurized fluid is introduced into the chamber 34 and the chamber 35 communicates with the outlet. Thus, the displacement of the piston 3 2 takes place to the left (Fig. 3) and consequently also the corresponding displacement of the element 28 which carries the pin 27, whereby the pins 27 and separated from each other.

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After the tool 4 has been separated from the workpiece by means of a mechanism to be described below, and to ensure that the carriage 2 is returned to its starting position for a new run one by means of a spring, or even better a pneumatic one Cylinder, actuatable reset device provided. For example a pneumatic system with a tube or plunger can be used, which is shown schematically in Fig.2 and is shown in section in FIG.

In this system, a shaft-shaped piston 36 is by means a screw 37 attached to a side plate 2a of the carriage 2 in such a way that its axis is parallel to the direction of movement of the carriage. This shaft-shaped piston 36 slides in the chamber 38 of the cylinder 38a, which is fastened closed on the base 1. In this chamber 38 is a pressurized fluid held so that the shaft-shaped piston 3 6 the role of a plunger to return the slide 2 in its starting position (right in Fig. 2 and 3) takes over, the carriage being pushed with constant force will.

The resetting of the carriage 2 is made possible by the reversibility of the connection between screw and lock screw, for example by continuously returning balls (connection between the spindle 10 and the nut 9). While this passage, the spindle 10 can rotate freely in the opposite direction until it returns to the angular position reached that she had at the beginning of the previous cycle, and in which she now remains.

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The rotation of the spindle 10 in the opposite direction takes place under the pressure of the nut 9 when the pins 25 and 27 are separated from each other.

The arrangement of the carriage 2, i.e. the determination of the positions at the end of its path, is made by two micro-interrupters 39 and 40 ensured at the end of the path, which work pneumatically, for example, and on the side 1d of the Base 1 (FIGS. 2 and 4) can be marked and interact with a stop 41 fixedly attached to the slide 2.

These micro-breakers 3 9 and 40 are each supported by a small support 40a, which by means of a screw 40b are connected to a support segment 40c which slides in a T-shaped incision 40b which runs along the Side 1d of the base 1 is formed. When closing or opening the screw 40b, the markable position of the Support 40a fixed, and thus the position of the corresponding micro-interrupters 40 and 39, respectively.

The micro-breaker 39 is operated in a known manner, wherein it involves the supply of pressurized air into the chamber 3 4 for release the pin 2 5 and 27 controls, while the micro-breaker is operated, so that the compressed air is introduced into the chamber 35 is, wherein the pins 2 5 and 27 come back into contact with each other. At the end of the way to disengage the positive coupling is also provided with a safety device, if the micro-breaker 39 is not working properly, or if for any reason, those to make sure The compressed air provided for uncoupling does not reach the chamber 34.

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This safety device consists of an adjustable screw 42 which can be locked by means of a nut 43. the Screw is connected to the side plate 2a of the carriage 2 and can be connected to the head 31a of the shaft 31, the protrudes beyond the side wall 1b, come into engagement.

In the same way, the shaft 31 is displaced mechanically from right to left (cf. FIG. 3) by means of the screw 42 when the carriage 2 has reached the end of its path, ensuring that the tenons 25 and 27 are separated from each other. Thus, this process is ensured even if the micro-breaker to Disengaging (39) does not work.

As already stated, the tool slide 3 slides back and forth on the slide 2. More precisely, it slides the carriage 3 on a rail assembly 44, one rail of which is on a base 45, in its interior (at 46) the drive mechanisms for the tool slide are accommodated, which, however, will be described in more detail below will.

The base 45 is connected to the carriage 2 in any position, the slide rails 44 being perpendicular to the direction of displacement of the carriage 2, or an angle between -TO and +10 with respect to the perpendicular to this Enclose direction.

The tool slide 3 moves along the rails 43 and 44 under the action of a shaft 47 (FIG. 2), which

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in turn perpendicular to the direction of movement of the tool slide 3 moved back and forth. This shaft 47 has a groove 4 8 with inclined flanks, which by two inclined surfaces 4 8a and 4 8b, which run parallel to each other and between which the faceted end 49 of a small axis of rotation 50 is used.

The other end 51 of the axis of rotation 50 is fixed to the tool slide 3 connected. The reciprocating displacement of the shaft 47, which extends from the base 45 through the opening 52 protrudes away, is ensured by a pneumatic cylinder 53, which is mounted on the carriage 2 and in both Directions through the micro-interrupters 3 9 and 40 at the end of the path of the carriage 2 is controllable.

The connection between the shaft 47 and the shaft 54 of the cylinder 53 is ensured by an articulated connection, which consists of a cross head 55, which with the end 54a of the shaft 54 and with the front part of its fastening part 56 is screwed to the shaft 47. This fastening part 56 enables an inclination of the shaft 47 with respect to the shaft 54, so that the tool slide 3 is also in a direction relative to the perpendicular to the direction of displacement of the slide 2 offset direction can work, the displacement of the shaft 54 runs parallel to the displacement direction.

If the cylinder 53 is actuated, a displacement is obtained of the tool slide 3 in one or the other direction by the faceted end 49 of the axis of rotation 50 against the sides of the groove 48 engages.

This means that the tool can be used at the end of each cutting pass

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4 Lift off the workpiece to bring the tool against the workpiece after resetting the carriage 2 to start again when the carriage 2 is in a for the next pass suitable starting position. At the same time, the cutting depth is adjusted by setting the one after the other following passages of the shaft 54 changed, for example by means of a mechanism connected to the carriage 2 with adjustable stops (which is not shown because it is of a known type).

This mechanism controls the pneumatic cylinder 53 in a known manner after each working cycle of the Slide 2, causing a change in the path of the shaft 54 and consequently the path of the tool slide 3 for each cutting process.

For example, such a mechanism is described in Italian patent 532,273.

So that the restart of the thread cutting process takes place with each new pass exactly in phase, i.e. so that the tool comes into contact with the workpiece exactly at the point at which the previous pass has ceased, it is absolutely necessary that the ratio between the number of revolutions of the rotary spindle (and, consequently, of the workpiece into which the thread is to be cut) and the number of revolutions of the telescopic shaft 15-15b is an integer.

This condition is necessary so that the pin 25 assumes the angular position again at the beginning of each new cycle,

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in which he is at the beginning of the first cutting pass found.

In the following, the operation of the inventive Device described. After the device has been mounted on the slide of a lathe by placing the base 1 on the Lathe has been established, and after the slide has been brought into the correct position and locked there, can you start with it in a workpiece which is between the lathe spindle and the counterpoint of the lathe or above the Rotary spindle is attached to cut a thread.

The first cutting pass starts from the position at the end of the path defined by the micro-interrupter 40, wherein the carriage 2 is moved to the right (see. Fig. 1 to 3). This micro-breaker controls the supply of compressed air to the chamber 35 of the cylinder 33 and connects the chamber 34 with the outlet so that the pins 25 and 27 in Reach engagement, and consequently the telescopic shaft 15-1 5b-- ' is connected to the auxiliary shaft 14. The spindle 10 rotates is now at an angular speed that is proportional to the speed of the screw 17 of the lathe, in this way a displacement of the slide 2 in the longitudinal direction from right to left is brought about. At the At the end of the first passage (FIG. 3), the stop 41, which is fastened to the slide 2, arrives with the micro-interrupter 39 in contact, which controls the supply of compressed air to the chamber 34 of the cylinder 33 and the chamber 3 5 with the outlet in Connection sets, whereby the pin 37 is shifted to the left (Fig. 3) and is thus released from the pin 25. If those Separation is done in this way, the rotation stops

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Spindle 10 opens and the carriage 2 comes to a standstill.

Immediately thereafter, the resetting member consisting of the plunger 3 6 can be actuated, which moves under the action of compressed air in the chamber 3 8 from left to right (Fig. 2) and takes the slide 2 with it and returns it to its starting position. The micro-breaker 3 9 controls also the pneumatic cylinder 53, which shortly before the return causes a displacement of the tool slide and thus also a displacement of the tool 4 in that it is lifted from the workpiece.

When resetting, which is ensured by the force of the plunger 36, the spindle 10 - the one in this Phase is movable - rotated in the opposite direction (compared to before), being rotated by the is driven by the carriage 2 carried mother.

This reversal of direction is due to the reversibility of the connection between screw and screw possible with return of balls.

At the end of the return path, the stop 41 comes into contact with the micro-interrupter 40, which in turn is the two Brings pins 25 and 27 into contact with one another.

The auxiliary shaft 14 and the telescopic shaft 15-15b. Are thus again connected to each other while the same micro-breaker 40 actuates the pneumatic cylinder 53 controls in the direction in which the tool slide 3 returns to the workpiece, so that the tool 4 starts again the thread to be cut can be created.

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244137 4

A new cutting process then takes place, provided that that the spindle 10 rotates again under the action of the lock screw 17. Repeat on the second pass the phases described above, namely the stopping of the carriage 2, the lifting of the tool 4 from Workpiece and subsequent return of the carriage 2 to the starting position for a possible implementation of a new one Pass.

These work cycles can be repeated an infinite number of times until the desired thread depth has been reached. At the end of each reset gear the tool 4 is lifted from the workpiece so that it is not damaged and returns to the working position, after it has been moved slightly towards the workpiece (at the same time that the pins 25 and 27 are in Get into engagement) under the control effect of the movement of the shaft 54 of the cylinder 53. As already stated, reverses the pin 27 returns to the angular position it had at the beginning of the previous pass.

The tool 4 is always returned to the previously worked thread, provided that a kinematic connection, is present, which is exactly between the number of revolutions of the turning spindle (and consequently of the workpiece) and the number of Movements of the pin 25, which drives the pin 27 when it is in engagement therewith, is fixed, and provided that that this pin assumes exactly the previously assumed angular position again.

In addition, as already stated, you can use the inventive Device produce threads with any thread pitch (in metric or inch sizes) as they do

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are currently used without having to replace the most important part of the drive system for the carriage 2 must, which in this case consists of the connection of screw and lock screw with return of balls.

In fact, there are for every thread type and for every thread pitch a ratio which is determined by the number of revolutions of the 'turning spindle and the displacement of the carriage 2 (at each revolution of the turning spindle) is set if the condition is met that the ratio between the number of revolutions of the rotating spindle and the number of movements of the telescopic shaft 15-15b with an integer can be expressed.

If one maintains a spindle 10 with a predetermined rise in the tapping device, if man the transmission ratios of gear groups 11 to 13 and 18 to 20 in the gear sets changed, and if you are consequently in Transmission gear 21 of the lathe has set a suitable ratio, one can always use the aforementioned kinematic Achieve conditions for executing the desired thread.

Finally, it is also noted that the inventive Device enables a quick and automatic production of threads even on parts with very long lengths, both in the case of a rise in metric measurements as well as in inch measurements as they are currently used, with the same conditions are ensured for each new round as were ensured for the first round, so that the rise of the thread is not lost and that the threads do not cross each other.

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24A1974

It should also be noted that the provision of the Slide 2 can be carried out very quickly in its starting position and no reversal of the direction of rotation of the Telescopic shaft 15-15b required. This telescopic shaft always turns regularly in the same direction, provided that that it is always kinematically connected to the screw 17 of the lathe.

To change the overall length of the thread, it is sufficient if the microswitches 39 and 40 are moved, i.e. if they are move closer together or further apart.

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Claims (1)

Claims 1.I Automatic and fast working threading device for the production of threads on two parallel movement paths, which have a base for fastening on the slide of a lathe or another machine, a slide or feed carriage that moves in the longitudinal direction slides on the base and parallel to the surface line of the thread to be produced, and has a tool slide, which slides at an incline in relation to the direction of displacement of the carriage or the feed carriage, characterized in that a reversible mechanism for converting a rotary motion into a rectilinear movement and vice versa is provided, which with the longitudinally displaceable base (1) of the Slide (2) is connected and can be controlled by a screw that a connecting element for transmission the movement of the lock screw is provided on the reversible mechanism, as well as a coupling part (25, 27), which with elements to limit the path to open and close the coupling part at the ends of the path of the slide cooperates, and that elements are provided for reversing the movement of the slide, which Regardless of the displacement of the rotary spindle, the slide returns to its starting position after each thread cutting cycle and that finally elements for moving the tool slide (3) ″ are provided are. - 21 - 509812/0317 2. Thread cutting device according to claim 1, characterized in that the reversible mechanism has a screw and a lock screw, for example with return of balls. 3. Thread cutting device according to claim 1 and 2, characterized in that the reversible mechanism has a nut (9) fastened to the slide and a spindle (10) rotating on the base (1), whose axis runs parallel to the sliding direction of the carriage (2), as well as a first auxiliary shaft (14), which on the base (1) is rotatably mounted and parallel to the spindle (10), a first kinematic coupling with variable Gear ratio between the spindle (10) and the first auxiliary shaft (14), a second auxiliary shaft (15-15b), the first end of which on the base (1) above the Extension of the axis of rotation of the first auxiliary shaft (14) is attached, and a second kinematic coupling with variable transmission ratio between the other end of the second auxiliary shaft and the screw (17) of the lathe, with a form-fitting between the first auxiliary shaft (14) and the first end of the second auxiliary shaft Coupling (16) is interposed. 4. Thread cutting device according to one of the claims 1 to 3, characterized in that the first kinematic coupling with variable transmission ratio between the spindle (10) and the first auxiliary shaft (14) and the second kinematic coupling with variable transmission ratio between the second auxiliary shaft and the screw (17) of the - 22 - 509812/0317 Lathe have such a gear ratio that the ratio between the number of revolutions of the Rotary spindle and the number of revolutions of the spindle of the kinematic reversible mechanism are an integer is. 5. Thread cutting device according to one of claims 1 to 4, characterized in that the positive coupling (16) one on the first end of the second auxiliary shaft, which is towards the first auxiliary shaft is directed, has protruding arranged first pin (25), as well as one via a longitudinally displaceable Element (28) protruding second pin (27) which slidably is connected to the end of the first auxiliary shaft (14), while this movable to and fro Element (28) organs are provided so that the two pins (25 and 27) engage with each other and out Are brought into engagement. 6. Thread cutting device according to claim 5, characterized in that the movable Part (28) is connected to a shaft (31) of a control cylinder (3 3) which can be acted upon by a fluid which is actuated by micro-interrupters (3 9, 40) at the end of the • path connected to the base 1 are. 7. Thread cutting device according to one of claims 1 to 6, characterized in that a fuse is provided at the end of the path, which consists of a position marking part (42, 43) which is connected to the carriage (2) and which is provided with an extension - 23 - 509812/0317 (31a) of the shaft (31) by means of a fluid actuatable control cylinder (33) for shifting the moving part (2 8) of the form-fitting coupling (16) and thus to bring about the separation of the first pin (25) can be brought into engagement by the second pin (27) when the carriage (2) has reached a position at the end of its path reached and if the corresponding microswitch (3 9) fails at the end of the path. Thread cutting device according to one of Claims 1. to 7, characterized in that the Elements for returning the slide (2) to its starting position after each cutting pass, a plunger (36), which is connected to the carriage (2), and one by a pressurized Fluid-actuated cylinder (38a) which is firmly connected to the base (1) and in which the plunger (36) slides. Thread cutting device according to one of claims 1 to 8, characterized in that the Elements for moving the tool slide (3) in the transverse direction, a first slide rail on the slide (2), as well as a rail firmly connected to the tool slide (3) and sliding in the first slide rail have that the first slide rail on the carriage (2) in a relative to the longitudinal direction of the sliding movement The inclined position of the carriage (2) is adjustable so that it can be moved back and forth perpendicular to the two rails (44) sliding shaft (47) is provided for controlling the tool carriage (3), as well as one fixed to the - 24 - 50981 2/0317 Tool slide (3) connected axis of rotation (50), which protrudes to the shaft (47) that one through two vertical surfaces (48a, 48b) that are inclined with respect to the direction of displacement of the shaft (47) are delimited by the groove (48) in the shaft (47) is provided that the end (49) of the axis of rotation is provided with facets and against the inclined surfaces (48a, 48b) of the groove (48) rests that a liquid cylinder (53) is attached to the carriage (2) is, the piston of which is connected to the shaft (47) by means of an articulated connection (55, 56), and which • can be acted upon by the microswitch (3 9, 40) at the end of the path of the slide (2), so that the tool (4) can be lifted off the workpiece and moved towards it. 10. Thread cutting device according to claim 9, characterized in that the slide rails (44) of the tool slide (3) are arranged perpendicular to the sliding direction of the slide (2). • 11. Thread cutting device according to claim 9, characterized in that characterized in that the slide rails (44) of the tool slide (3) an angle between Include + 10 ° and -10 ° with respect to the vertical to the sliding direction of the slide (2). 12. Thread cutting device according to one of claims 1 to 11, characterized in that a mechanism with adjustable stops on the Carriage is provided, which at the beginning of each cutting pass to change the depth of the thread - 25 - 509812/0317 Path of the piston which can be acted upon by means of a fluid Increased cylinder, which is connected to the shaft (47) of the tool slide (3). 50981 2/0317 Leeward