BUTT WELDING MACHINE WITH A CUTTER FOR A PLASTIC PIPE COMPRISING A DRIVE GEAR UNIT

Abstract

The invention relates to a butt welding machine adjusting the ends of plastic pipes and welding them to each other, which comprises a cutter having a driving element for moving the trimmer by being driven, at least one movable claw, moving depending on a connector to hold pipes which are positioned, a motor which does not have direct connection with the cutter and transfers power to the cutter and to the movable claw via one connector for each, a cutter which needs to be had two different driving motion performed via two different connectors, a drive gear unit providing driving energy to the movable claw from one point.

Claims

1. A butt welding machine (2) adjusting the ends of plastic pipes and welding them to each other comprising a cutter (1) having a driving element (16) for moving the trimmer (13) by being driven, at least one movable claw (24, 32, 33) moving depending on a connector to hold pipes which are positioned, a motor (21) which does not have direct connection with the cutter (1) and transfers power to the cutter (1) and to the movable claw (24 and/or 32 and/or 33) via one connector for each, the cutter comprising a drive point such as hydraulic or manual drive; characterized by a cutter (1) which needs to be had two different driving motion performed via two different connectors, a drive gear unit (22) providing driving energy to the movable claw (24 and/or 32 and/or 33) from one point and which can work different points synchronously via driving from one point.

2. The butt welding machine (2) according to claim 1 comprising the drive gear unit (22) providing horizontal motion of the machine (2) and driving of the cutter (1) via one shaft.

3. The butt welding machine (2) according to claim 1 comprising the drive gear unit (22) driving the cutter (1) from at least two shafts such as a lower bearing shaft (30) and an upper bearing shaft (25).

4. The butt welding machine (2) according to claim 3 characterized by the drive gear unit (22) comprising synchromeshes working the cutter (1) and the function of forward-backward motion at the same time or separately.

5. The butt welding machine (2) according to claim 2, characterized by comprising the cutter (1) moving as much as the thickness of the piece cut from the butts of plastic pipes and therefore preventing pressing of pipes.

6. The butt welding machine (2) according to claim 5 characterized in that at least one connector is shaft (23, 25, 28, 29, 30, 31).

7. The butt welding machine (2) according to claim 6 characterized by comprising a cutter driving shaft (29) connecting the cutter (1) with the drive gear unit (22) and transmitting the motion energy which it receives from the drive gear unit (22) to the driving disc (16) for driving the cutter (1).

8. The butt welding machine (2) according to claim 7 characterized by the drive gear unit (22) adjusting the motion coming from a driving unit such as hydromotor, pneumatic, electric motor (21) or manual drive by changing its speed before it transmits the motion to the cutter driving shaft (29).

9. The butt welding machine (2) according to claim 8 characterized by comprising a lower driving shaft (31) and an upper driving shaft (23) connecting the movable claws (24, 32, 33) with the drive gear unit (22) and transmitting the motion energy that it receives from the drive gear unit (22) to the movable claws (24, 32, 33) for driving the movable claws (24, 32, 33).

10. The butt welding machine (2) according to claim 9 characterized by the drive gear unit (22) adapted for moving the movable claws (24, 32, 33) linearly forward-backward at the horizontal axis of the machine (2) and for moving the cutter (1) attached at a different shaft at the same time synchronously.

11. The butt welding machine (2) according to claim 10 characterized by the drive gear unit (22) adapted for moving the movable claws (24, 32, 33) forward-backward linearly at the horizontal axis of the machine (2) and for moving the cutter (1) attached at a different shaft rotationally at the same time synchronously.

12. The butt welding machine (2) according to claim 11 characterized by the drive gear unit (22) comprising a motor (21) or its gear (221), a reduction input gear (231), an output gear without reduction (241), a reduction output gear wheel (251), a reduction output wheel (261), a reduction input threaded rod (271), a reduction input worm (281), a reduction output worm (291), a reduction leadscrew threaded rod (301), a reduction output threaded rod (311), a movable claw gear shaft (321), a movable claw gear (331) providing the motion of the movable claws (24, 32, 33) at the horizontal direction, a movable claw upper chain wheel (341), a chain (351), a chain tightener wheel (361), a movable claw lower chain transmission wheel (371), a chain transmission wheel (381), a movable claw lower chain wheel (391), a movable claw lower wheel (401), a cutter drive wheel (411), a cutter gear wheel (421) providing the motion of cutter (1), a cutter gear (431), a movable claw upper wheel (441).

13. The butt welding machine (2) according to claim 12 characterized by comprising one or two magnetic coiled movable claw gear (331) and magnetic coiled cutter gear (431) with synchromesh.

14. The butt welding machine (2) according to claim 13 characterized by comprising a reduction system which reduces the speed of the movable claw upper and lower driving shafts (23, 31) providing the motion of the movable claws (24, 32, 33) at the horizontal direction during the cutting process.

15. The butt welding machine (2) according to claim 14 characterized by the drive gear unit (22) having a cap and a close protective box which does not transmit impurities such as dust, soil, water depending on places of its use.

16. The butt welding machine (2) according to claim 15 characterized by the drive gear unit (22) that provides the forward motion of the movable claws (24, 32, 33) towards the fixed claw (27) at the direction of horizontal axis of the machine (2) via being driven by the motor (21).

17. The butt welding machine (2) according to claim 16 wherein the motor (21) is an electric motor.

18. The butt welding machine (2) according to claim 17 characterized by the drive gear unit (22) having a cutter gear (431) which is operated as single or dual optionally and movable claw gear (331); namely, synchromeshes for gear joints and cycle changes.

19. The butt welding machine (2) according to claim 18 characterized by the drive gear unit (22) having a manual, hydraulic, magnetic coiled, mechanic or pneumatic cutter gear (431) optionally and movable claw gear (331); namely, synchromeshes for gear joints and cycle changes.

20. The butt welding machine (2) according to claim 19 characterized by comprising the cutter (1) which has no motor mounted on itself and has a driving disc (16) comprising gear instead of a motor driven mechanism on itself and is adapted such that it is driven via the cutter driving shaft (29).

21. The butt welding machine (2) according to claim 20 characterized by the cutter (1) having the driving disc (16) to which motion transmission is provided by gear or friction drive.

22. The butt welding machine (2) according to claim 21 characterized by the cutter driving shaft (29) and movable claws (24, 32, 33) adapted such that they use manual, mechanical, hydraulic or pneumatic energy optionally for providing the forward-backward motion of the cutter driving shaft (29) and movable claws (24, 32, 33) at the horizontal direction of the machine (2) towards the fixed claw (27).

23. The butt welding machine (2) according to claim 4 having a driving system comprising the drive gear unit system (22) which is completely servo and compatible with all automation system and comprising synchromesh providing that the cutter (1) and the machine (2) moves forward at the same time and when there is no cutter (1), the machine (2) move only forward-backward automatically.

24. The butt welding machine (2) according to claim 23 characterized by comprising the driving system having the drive gear unit (22) such that it works with one synchromesh not with two synchromeshes.

25. The butt welding machine (2) according to claim 24 comprising the driving system having one geared cutter (1) for the machine (2) with two shafts or 4 shafts.

26. The butt welding machine (2) according to claim 25 having the driving system comprising double geared cutter (1) which comprises one more gear between the cutter (1) and gear connected to the shaft, for the machine (2) with two shafts or 4 shafts.

27. The butt welding machine (2) according to claim 25 having the driving system comprising the cutter (1) and shaft having a gear which can perform power transmission and drive by using a rubber or chain (351).

28. (canceled)

Description

DETAILED DESCRIPTION OF THE INVENTION

DESCRIPTION OF THE FIGURES

[0034] FIG. 1: It is the perspective view of the disclosed butt welding machine of the invention.

[0035] FIG. 2: It is the perspective view of the cutter and cutter driving shaft of the butt welding machine.

[0036] FIG. 3: It is the view of the cutter of the butt welding machine from an angle.

[0037] FIG. 4: It is the view of the section A-A of the cutter of the butt welding machine in the FIG. 3.

[0038] FIG. 5: It is the view of the cutter of the butt welding machine from another angle.

[0039] FIG. 6: It is the view of the section B-B of the cutter of the butt welding machine in the FIG. 5.

[0040] FIG. 7: It is the exploded view of the drive gear unit of the disclosed butt welding machine of the invention.

[0041] FIG. 8: It is the exploded view of the drive gear unit of the disclosed butt welding machine of the invention from another angle (from the right side of the machine according to the FIG. 1).

[0042] FIG. 9: It is the view of the drive gear unit of the disclosed butt welding machine of the invention from another view (from the left side of the machine according to the FIG. 1).

[0043] FIG. 10: It is the perspective view of the drive gear unit showing the conditions of the gears while the cutter of the disclosed butt welding machine of the invention is not working.

[0044] FIG. 11: It is the perspective view of the drive gear unit showing the conditions of the gears while the cutter of the disclosed butt welding machine of the invention is working.

DESCRIPTION OF THE REFERENCES IN THE FIGURES

[0045] The parts in the attached figures are numbered respectively and the equivalents of these numbers are given below.

2. Butt welding machine [0046] 20. Chassis [0047] 21. Motor [0048] 23. Movable claw upper driving shaft [0049] 24. Movable claw [0050] 25. Upper bearing shaft [0051] 26. Heater [0052] 27. Fixed claw [0053] 28. Side bearing shaft [0054] 29. Cutter driving shaft [0055] 30. Lower bearing shaft [0056] 31. Movable claw lower driving shaft [0057] 32. First holder [0058] 33. Second holder

1. Cutter

[0059] 10. Upper bearing [0060] 11. Bearing disc [0061] 12. Knife disc [0062] 13. Trimmer (Knife) [0063] 14. Lower bearing [0064] 15. Lower bearing fixing element [0065] 16. Driving element (driving disc) [0066] 17. Ball
22. Drive gear unit [0067] 221. Motor gear [0068] 231. Reduction input gear [0069] 241. Output gear without reduction [0070] 251. Reduction output gear wheel [0071] 261. Reduction output wheel [0072] 271. Reduction input threaded rod [0073] 281. Reduction input worm [0074] 291. Reduction output worm [0075] 301. Reduction leadscrew threaded rod [0076] 311. Reduction output threaded rod [0077] 321. Movable claw gear shaft [0078] 331. Movable claw gear [0079] 341. Movable claw upper chain wheel [0080] 351. Chain [0081] 361. Chain tightener wheel [0082] 371. Movable claw lower chain transmission wheel [0083] 381. Chain transmission wheel [0084] 391. Movable claw lower chain wheel [0085] 401. Movable claw lower wheel [0086] 411. Cutter drive wheel [0087] 421. Cutter gear wheel [0088] 431. Cutter gear [0089] 441. Movable claw upper wheel

[0090] The disclosed butt welding machine (2) of the invention comprises a chassis (20) which is at the lower side of the machine (2) and provides support to the machine (2), a motor (21) providing driving of the machine (2) and a drive gear unit (22) transferring power from the motor (21), an upper driving shaft (23), a movable claw (24), an upper bearing shaft (25), a heater (26), a fixed claw (27), a side bearing shaft (28), a cutter driving shaft (29), a lower bearing shaft (30) and a lower driving shaft (31) and two movable holder (32 or 33).

[0091] The disclosed butt welding machine (2) of the invention also comprises a cutter (1). The cutter (1) comprises an upper fixed bearing (10), a bearing disc (11), a knife disc (12), at least one trimmer (13), a lower fixed bearing (14), a lower bearing fixing element (15), a driving element (16) such as driving disc (16) and preferably balls (17).

[0092] The cutter (1) can be driven from the lower bearing shaft (30) or upper bearing shaft (25) or both of them (25 and 30). Therefore, a second reduction is formed at the cutter (1). For this reason, feed rate of the machine (2) and rotational speed of the cutter (1) can be adjusted as required.

[0093] Another embodiment of the disclosed butt welding machine (2) of the invention comprises a chassis (20) which is at the lower side of the butt welding machine (2) and provides support to the machine (2) and a motor (21) providing driving the machine (2) and a drive gear unit (22) transferring power from the motor (21), an upper bearing shaft (25) providing driving and bearing together, a lower bearing shaft (30) providing driving and bearing together, holder or holders (32 and/or 33), movable claw or claws (24).

[0094] An embodiment with two shafts of the disclosed butt welding machine (2) of the invention comprises a single geared, double geared or three geared cutter (1) which can be driven only from the lower bearing shaft (30), the upper bearing shaft (25) or from both of them (25 and 30).

[0095] The drive gear unit (22) comprises a motor gear (221), a reduction input gear (231), an output gear without reduction (241), a reduction output gear wheel (251), a reduction output wheel (261), a reduction input threaded rod (271), a reduction input worm (281), a reduction output worm (291), a reduction leadscrew threaded rod (301), a reduction output threaded rod (311), a movable claw gear shaft (321), a movable claw gear (331), a movable claw upper chain wheel (341), a chain (351), a chain tightener wheel (361), a movable claw lower chain transmission wheel (371), a chain transmission wheel (381), a movable claw lower chain wheel (391), a movable claw lower wheel (401), a cutter drive wheel (411), a cutter gear wheel (421), a cutter gear (431), a movable claw upper wheel (441).

[0096] The trimmer (13) is a knife in the preferred embodiment of the invention.

[0097] The driving disc (16) has a structure which allows to be moved via a shaft.

[0098] The holders (32, 33) are positioned such that there are one for each two sides of the cutter (1) for fixing the ends of pipes which are at the cutter (1) side. The first and second holders (32, 33) are movable claws.

[0099] At the machine (2); the fixed claw (27), first holder (32), heater (26), cutter (2), second holder (33), movable claw (24) are positioned from left to right respectively. All of these elements (27, 32, 26, 2, 33, 24) are in circular form (e.g. disc) and their connections are made to the related shafts (23, 25, 28, 29, 30, 31) in order that they are driven.

[0100] A first plastic pipe is passed through the fixed claw (27) and first holder (32) and it is provided that it reaches to the heater (26) and/or cutter (2). At the opposite direction; a second plastic pipe is passed through the movable claw (24) and second holder (33) and it is provided that it reaches to the heater (26) and/or cutter (2).

[0101] The fixed claw (27), the heater (26), the cutter (2), the movable claw (24) and holders (32, 33) are attached to the upper bearing shaft (25) from one end of each and to the lower bearing shaft (30) from another end of each.

[0102] In addition, the cutter (1) is connected with the cutter driving shaft (29).

[0103] In the invention, the motor (21) is positioned at the machine (2) without direct physical contact with the cutter (1) for driving the cutter (2). The connection of the cutter (1) and motor (21) is made via a connector such as a shaft.

[0104] In all embodiments of the butt welding machine (2), said cutter (1) can be driven from only one shaft or both lower and upper bearing shafts (25, 30) via two gears by providing better reduction due to a single gear connected to the shaft and a gear positioned between the cutter (1) and a gear connected to the shaft.

[0105] In FIG. 1, the general perspective view of the butt welding machine (2) for plastic pipes which joins the plastic pipes by butt welding method. The elements of the butt welding machine (2) for plastic pipes are mounted to the chassis (20). The motor (21) (electric motor in this embodiment) provides the drive mechanism of the machine (2) together with the drive gear unit (22). This mechanism (21, 22) drives the lower and upper driving shafts (31, 23) of the machine (2). The movable claw (24) holding one of two plastic pipes makes axial movement on the upper, side and lower bearing shafts (25, 28, 30) due to these driving shafts (31, 23) and therefore, it gets the pipes near to each other. It provides that pipes are pressed to each other by providing necessary pressure for beading. The fixed claw (27) holding the second pipe is fixed by the upper, side and lower bearing shafts (25, 28, 30). Also, the cutter (1) is fixed to the upper, side and lower bearing shafts (25, 28, 30) like the movable and fixed claws (24, 27) in the butt welding process. Because there is not any motor or reducer on the cutter (1) for driving, the cutter (1) is driven by the cutter driving shaft (29) which is driven via the drive gear unit (22) and main electric motor (21) of the butt welding machine (2). After the cutting process is finished, the cutter (1) is removed from the system and the heater (26) is added to the system instead of it. The heating process is continued under a certain pressure and time, the heater (26) is removed from the system when desired parameters are provided, beading is provided by pressing the pipes to each other under a certain pressure by the movable claw (24) and the welding process is performed in accordance with the international standards.

[0106] In the invention: the motor (21) can be hydraulic, pneumatic and triggering can be provided also via other driving mechanisms like manual instead of the motor (21).

[0107] In FIG. 2, the cutter (1) is shown in detail. The upper cutter bearing (10) on the cutter (1) is beared to the upper bearing shaft (25) of the welding machine (2). This cutter bearing (10) provides that the cutter (1) turns around the upper bearing shaft (25). The cutter bearing disc (11) performs bearing for the cutter knife disc (12). The knives (13) on the cutter knife disc (12) perform the cutting process of the butts of pipes. The lower bearing (14) of the cutter (1) is attached to the lower bearing fixing element (15) of the welding machine (2) such as a pin (15) and it is locked. This lower cutter bearing (14) and pin (15) provide that the cutter (1) stays fixed during the cutting process and that the pipe butt surfaces form properly.

[0108] In the FIG. 3, the sectional view of the cutter (1) is shown. Gear and/or friction driving disc (16) is driven by the cutter driving shaft (29) and the balls (17) are used around this disc (16) in order that it rotates easily in this embodiment and this disc (16) performs the cutting process by rotating the cutter knife disc (12) to which it is connected or a cutter, which can be rotated from bottom or side shaft with a single driving shaft or with a transfer system, is used.

[0109] In the FIG. 8, the moving claw gear and cutter gear (331, 431) are shown while the cutter (1) is not working.

[0110] In the FIG. 9, the moving claw gear and cutter gear (331, 431) are shown while the cutter (1) is working.

[0111] The drive transmission line is different while the cutter (1) is working and while the cutter (1) is not working. While the cutter (1) is not working, the motor gear (221) is rotated by being driven from the motor (21). The motor gear (221) rotates the reduction input gear (231), the reduction input gear (231) rotates the output gear without reduction (241). Therefore, the output gear without reduction (241) drives reduction output gear wheel (251). This wheel (251) drives the chain transmission wheel (381) by rotating the movable claw gear shaft (321) which it is connected to and it activates the chain system. The chains (351) are tightened by the chain tightener wheels (361) and it provides that the chains (351) fits to the chain wheels (341, 371, 381, 391) completely. The chain transmission wheel (381) drives the movable claw lower and upper wheels (401, 441) by rotating the movable claw upper chain wheel (341) and movable claw lower chain wheel (391) via movable claw upper chain transmission wheel (371) and provides that the movable claws (24) are moved at the direction of the horizontal axis of the machine (2).

[0112] While the cutter (1) is working, the motor gear (221) is rotated by being driven from the motor (21). The motor gear (221) drives the reduction input gear (231) and the reduction input threaded rod (271) connected to it. This rod (271) drives the reduction input worm (281) which it works together with and therefore, the reduction leadscrew threaded rod (301) which this worm (281) works together with is rotated. This rod (301) drives the reduction output worm (291) and therefore, the reduction output threaded rod (311) is rotated. This rod (311) rotates reduction output gear wheel (251) by driving the reduction output wheel (261) which it works together with. This wheel (251) activates the chain system by rotating the movable claw gear shaft (321) which it is connected to, driving the chain transmission wheel (381). The chain transmission wheel (381) drives the movable claw lower and upper wheels (401, 441) by rotating the movable claw upper chain wheel (341) and the lower chain wheels (391) via the movable claw upper chain transmission wheel (371) and provides that the movable claws (24) are moved at the horizontal direction.

[0113] The drive gear unit (22) is driven from the motor (21) which it is connected to. For the welding process, firstly the pipes are positioned at the movable and fixed claws (24, 32, 33, 27) and bolted and fixed to these claws (24, 32, 33, 27). After this process, the movable claws (24, 32, 33) are moved forward-backward at the horizontal direction by being driven from the drive gear unit (22) system. In this process, only the movable claws (24, 32, 33) are driven. The movable claw gear (331) is driven directly from the motor (21) without reduction by working at position A shown in the FIG. 8 to provide high speed. The pipes are separated from each other until the area required for mounting the cutter (1) to the welding machine (2) is provided.

[0114] After the cutter (1) is included into the system, the cutter gear (431) provides that the cutter driving shaft (29) is driven by the drive gear unit (22) by reaching to position B shown in the FIG. 9 and this shaft (29) starts the cutting process by driving the cutter (1). Before the cutting process starts, the movable claw gear (331) starts to be driven by the reducer, which reduces the speed, via reaching to position A shown in the FIG. 9. Because it is required that the movable claws (24, 32, 33) provides contact of the cutter knives (13) with the pipe butt surfaces in the cutting process, they should move towards the fixed claw (27) in the amount of cutting. However, this movement during the cutting process must be much slower than the free motion of the movable claws (24, 32, 33) at the horizontal direction during the times when there is no cutting process. That's why, usage of a reducer reducing the speed of the movable claw (24, 32, 33) is required during the cutting process. Therefore, the speed of the cutter driving shaft (29) is higher than the speed of the movable claw upper and lower driving shafts (23, 31) in the cutting process. When the cutting process finishes, the cutter gear (431) removes the drive coming to the cutter driving shaft (29) by reaching to position B in the FIG. 8, the movable claw gear (331) starts to be driven directly from the motor (21) by reaching to position A again and therefore it provides that the movable claw upper and lower driving shafts (23, 31) rotate with high speed. After the cutter (1) is removed from the system, the heater (26) is included to the system. The contact of the pipes to the butt surfaces is provided due to the forward-backward motion of the movable claws (24, 32, 33). After the heating process applied according to the parameters of pressure and time determined via international standards, the heater (26) is removed from the system and the pipes are pressed to each other by the movable claws (24, 32, 33) with a certain pressure and time until the desired beading thickness is formed and the welding process of the pipes is completed.

[0115] According to the embodiments of the invention, a synchromesh gear transmission rod used for gear and speed changes in the drive gear unit (22) may be manual, hydraulic, magnetic coiled, mechanical or pneumatic geared. The cutter and movable claw changing rod, namely; the synchromeshes are worked as single or double.

[0116] The disclosed system of this patent application has one main motor (21) instead of drive mechanism of the cutter and machine (2) feeding drive mechanism and this motor (21) provides driving to the cutter (1) and motion of the movable claw (24) from one point. This motor (21) and drive gear unit (22) system meet the driving need in this two different points having separate moment and torque. Therefore; need for the hydraulic unit and cutter motor (21) is removed, the butt welding machine (2) for plastic pipes is lightened.

[0117] In the disclosed butt welding machine (2) of the invention, one or two motor drives can be used. (Also; hydraulic, pneumatic, manual drives can be used.)

[0118] The pressing process of pipes to each other can be driven via a forward-backward motor (21) manually or mechanically and also it can be performed as hydraulic or pneumatic. However, the aim is not only to provide the forward-backward motion of the machine (2) via the motor (21) in this invention developed depending on driving with motor (21). The disclosed mechanism of this patent application provides the forward-backward motion of the machine (2) (shafts in the machine) and also drives the cutter which is the subject matter of our patent application in Turkey with the same application date with this application and with the title of BUTT WELDING MACHINE COMPRISING A CUTTER FOR A PLASTIC PIPE depending on this forward-backward speed synchronously. Therefore, it is not necessary that the motor (21), reducer or hydromotor are placed into the cutter and an additional driving system is also not necessary. Driving the machine (2) with the servo motor controls the cutting speed of the cutter synchronously depending on the feed rate of the machine (2). The drive gear unit (22) drives the cutter with the desired cycle ratio synchronously whatever speed the servo has. In the disclosed system of this application, the speed of this servo is adjusted due to the drive gear unit (22), not adjusted via driver. This system can be realized not only with the servo motor but also with a normal asynchronous motor. This system provides a more advantageous usage than the machines where hydraulic, pneumatic linear motion are provided. The cutter that is subject matter of our patent application with the title of BUTT WELDING MACHINE COMPRISING A CUTTER FOR A PLASTIC PIPE can be used in all forward-backward driving systems and a driving form having the most efficacious and the highest usage advantage is produced in case of providing forward-backward motion via the usage of the invention disclosed in this application. The cutter in our patent application with the title of BUTT WELDING MACHINE COMPRISING A CUTTER FOR A PLASTIC PIPE is developed together with the driving system with geared mechanism disclosed in this invention and provides the generation of the most appropriate and efficient butt welding machine (2) for plastic pipes. Two patent applications filed on the same day can work together compatibly and this increases the importance of said patent application.

[0119] In addition; if a machine whose linear motion is provided hydraulically or pneumatically (or other driving systems may be added) and if the cutter in the patent application which we develop with the title of BUTT WELDING MACHINE COMPRISING A CUTTER FOR A PLASTIC PIPE is used, this cutter can be driven by 3 different driving solutions. Going forward-backward of the machine and the rotation of the cutter can be realized from this single driving point in the system in case of the drive provided as hydraulic, pneumatic and manual. For driving the geared driving disc of a new type cutter which is the subject matter in the patent application with the title of BUTT WELDING MACHINE COMPRISING A CUTTER FOR A PLASTIC PIPE, a motor working hydraulically (hydromotor) or pneumatically (pneumotor) which has a proper gear on itself for the driving gear of the cutter can be used. If the machine (2) performs its linear motion with any of motors mechanically, the cutter may be driven on a suitable location of the machine (2), with a separate motor having a gear on it. In this situation, the gear changing synchromeshes are not required.

[0120] The invention is not limited with the disclosed embodiments above, a skilled person in the art can produce different embodiments of the invention easily. They should be evaluated within the scope of invention protection demanded with claims.

INDUSTRIAL APPLICABILITY OF THE INVENTION

[0121] The drive gear unit (22) of the butt welding machine (2) for plastic pipes producing solutions for the technical problems described above successfully, providing one driving center for driving of the movable claws and cutter which are two different driving point and working with the main motor (21), providing that the butt welding machine (2) for plastic pipes is a single body and is carried easily can be produced.