DE1937524A1 - Device for cutting pipes - Google Patents

Description

PATENT LAWYERS

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PATENT Attorney DIPL-ING. R. MD LLER-BOR N ER PATENTANWALT D I P L -1 N G. HANS-H. WEY

IBERLIN-DAH LEM 33 -POD B IE LS Kl A LLE E «58 8MDNCHEN 22 ■ Wl D EN MAYERSTRASSE 49

TEL. 0311 762907 TELEGR. PROPINDUS TELEX 0184057 TEL. 0811. 225585. TELEGR. PROPINDUS. TELEX 0524244

21 980

PERKIN & COMPANY LIMITED Leeds 12, (Great Britain)

Device for cutting pipes

The invention relates to a device for cutting pipes, preferably made of cellulose, plastic or Aluminum, in partial lengths, with a support roller that carries the pipe to be cut and engages in the pipe wall Cutting elements.

The known machines of the type described above work with circular saws or knives, the cut, takes place without a support of the pipe to be cut from the inside. This has the disadvantage that the circular knives used without being in any inside the

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Pipe located as a counter knife serving roller can not perform a clean cut, but
that the inner layers of the material to be cut loosen. The cutting of the pipes takes place in a radial direction, so that they are cut in partial lengths.

In other known cutting devices this becomes too
cutting tube usually on a barrel-shaped
Support core supported from the inside, this core, | hereinafter referred to as the support roller, corresponds to the inner diameter of the pipe to be cut and
consequently rests tightly against the inner wall. During the
During the cutting process, the core is rotated with the pipe, while the knife that causes the cutting process is stationary
remains and, if a cutting disk is used, can be driven. The disadvantage here arises
from the large number of platen rollers required for each different diameter of the one to be cut
Tube.

The invention is based on the object of eliminating the above disadvantages and, by means of a suitable device, to ensure a clean cut using a single platen.

The solution in a device of the type described above is that the platen, a maximum diameter which is smaller than the inner diameter of the pipes to be cut and two, on the outer wall of the pressure rollers attacking the pipe to be cut are provided, which press the pipe during the cutting process

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press on the platen.

The tube is advantageously driven over the platen, which is a drive device is assigned, which in a preferred embodiment of an engine, a V-belt and one on the Platen attached pulley consists.

It is obvious that in this embodiment the Support roller and the assignment of the pressure rollers sufficient friction occurs to the pipe to be cut on the cutting elements to turn past so that all pipe sizes can be cut with a single platen. One A particularly advantageous arrangement of the pressure rollers provides that these are symmetrical to a perpendicular through the axis of the platen running plane are arranged.

To make it easy to plug the pipes onto the support rollers to enable is provided in a further embodiment of the invention that the pressure rollers in a transverse to the axis of the Support roller extending direction are pivotable and this pivoting movement controlling adjustment elements are provided are. These adjusting elements consist of a simple design of a spindle with a screwed on it Yoke and to the side of this leading to each of the pressure rollers and engaging with articulated rods. The spindle can be assigned a servomotor that automatically performs the pivoting movement of the printing rollers. For this purpose, it is advantageous to assign limit switches for the pivoting movements of the printing rollers to the servomotor.

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The cutting elements are preferably arranged between the pressure rollers when these are in the operating position are, which results in an advantageous stabilization of the position of the pipe to be cut and rotating. Included One or more circular knives arranged at a distance from one another can be provided as cutting elements which are arranged on a shaft running parallel to the platen. It is particularly cheap if these cutting elements consist of a motor and a pulley located on the shaft, with an intermediate Drive belt, existing drive is assigned. To get the cutting elements out of the path of the on the support roller to be pushed on to be cut pipes bring out, it is provided that the shaft is pivotably mounted on swivel arms with an associated swivel drive is. This swivel drive simply consists of at least one pneumatically operated working cylinder.

The rationalization effect in the device according to the invention is increased in that the support roller has a Means for removing the pipe parts cut thereon is assigned. This is for example as immediate on the jacket of the platen approaching slide is provided, which back and forth axially to the platen can be pushed, a drive being assigned for these movements, which in turn consists of a pneumatically operated drive Working cylinder and between slide and working cylinder arranged translation device consists, which the slide twice the speed of the piston movement of the working cylinder gives.

About the easy pushing of the pipes onto the support roller

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To enable the support roller is stored at one end in a fixed bearing and at the other end in a bearing that is temporarily removable for the application of the pipe to be cut. In this case, the removable bearing is advantageously a tailstock arm which is movable by a pneumatically operated working cylinder and is provided with a toggle joint mechanism, the toggle joint mechanism supplying the force to support the tailstock arm acting on the end of the platen, regardless of the action on the working cylinder Knee joint is pushed through over an angle of 180 and thus secures against a backward force.

In the accompanying drawings, an embodiment for the device according to the invention is schematically shown «It show:

1 shows a vertical section through the device;

2 shows a plan view of the device according to FIG and

FIG. 3 shows a side view of the device according to FIG. 1.

The device shown in the accompanying drawings consists of a frame with uprights 10 and beams 12 as well as traverses Ik, suitable supports 16, 18 and 20 are used to store the individual drive parts and shafts in the machine frame.

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In the longitudinal direction of the device there extends a support roller 22 on which the pipes to be cut are placed be postponed individually. At one end the support roller 22 is attached to the machine frame by a device Bearing 24 and at the other end, only during the operating position, carried by a pivotable whip arm 25 '. This is shown in FIGS. 1 and 2 in the pivoted-out position and in FIG. 3 in the operating position.

^ posed. The tailstock arm 25 is attached to a transverse shaft 26 which is rotatable by a pneumatic working cylinder 28 acting on it, which has an adjuvant toggle lever mechanism which moves the tailstock arm 25 to and fro between its two positions. The toggle lever mechanism consists of a pair of toggle levers 30 and 32 connected to one another, the piston of the working cylinder 28 engaging in the articulation point of the two toggle levers. The other end of the toggle lever 32 is pivotably mounted in a support 3h , which in turn is attached to the transverse shaft 26, while the other end of the toggle lever 30 is pivotably connected to a pair of support plates 36, which in turn is attached to the machine.

\ nenrahmen is attached and the working cylinder 28 and bearing for the cross shaft 26 carries. When the working cylinder 28 is put into operation to pivot the tailstock arm 25 in the direction of its operating position shown in FIG Force to support the platen 22 is always present, even if the working fluid for the working cylinder is switched off or fails. The toggle mechanism is thus an additional safety device for the proper

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Operating sequence of the device.

The platen 22 is rotatably arranged and over a drive belt and pulley assembly 38 connected to an electric motor 40 which is attached to the machine frame.

Two pressure rollers 42 are symmetrical to each other on either side of a perpendicular through the axis of the platen 22 extending plane parallel to the platen 22 is arranged. The pressure rollers 42 can be directed towards the Support roller 22 and moved away from it, which is possible due to its suspension on a pair of arms 46 which extend in the transverse direction of the device. The arms 46 are supported on a pivot shaft 44 which runs in the longitudinal direction of the device and in bearings which are attached to the machine frame. On one At the end of the device, based on FIG. 2 on the left, each arm 44 carries a pivot arm 48 to which one of its A swivel arm 5Q engages ends. The other ends of the Swivel arms 50 are pivotable on an adjustment yoke 52 articulated, through which a vertically arranged spindle 54 extends.

This spindle is connected to an electric motor 56 twisted by the latter, this connection is made by a V-belt and a pulley 57 and a worm gear 58.

In preparing for the operation of the device, the tailstock arm 25 is in the position shown in FIGS pivoted and the pipe to be cut is pushed onto the support roller 22 over its free end. The pipe

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automatically assumes its correct position when the lateral surfaces of the pressure rollers k2 are applied , as shown in dash-dotted lines 60 in FIGS. 1 and 3. After the pipe 60 has been arranged in this way, the tailstock arm 25 is pivoted by the working cylinder 28 into its operating position shown in FIG. 3, the pressure rollers k2 being moved away from the support roller 22. The pressure rollers k2 are then moved together by a servomotor 56 until they rest on the outer surface of the tube 60, whereupon the motor 56 is stopped. The tube όθ is now firmly pressed against the platen 22, whereby its inner diameter, which is significantly larger than the diameter of the platen 22, can be disregarded. The cutting of the pipe 60 into sections can now begin, the support roller 22 being driven by the motor kO during the cutting process.

The cutting elements shown in the device are circular knives 62 which are arranged on a knife shaft 6k. The knife shaft lies above the platen 22 and parallel to it. The number of Kreisk knife 62 used depends on the number of pieces to be cut into which the pipe 60 is to be cut on the platen.

When the tubes are pushed on, the cutting elements are pivoted out of their path of movement, which is why the ¥ elle 6k can be pivoted by being suspended in a pair of pivot arms 66 , the latter being arranged transversely to the device. The pivot arms 26 represent two-armed levers and have a defined by the shaft 68

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Pivot point, which also extends in the longitudinal direction of the device. While a pair of the legs of the two-armed lever 66 carries the shaft 68, the other end of the same is hinged to a working cylinder 70 which is vertically fixed in the machine frame be pivoted away from the support roller 22 through the working cylinder 70 and when the tube 60 has assumed its intended cutting position, for. B, after the tailstock arm 25 has been pivoted into its supporting position, the working cylinders 70 are acted upon again so that the cutting shaft 6h and the circular knives 62 come down into contact with the outer surface of the pipe 60 at one or more points where the pipe is to be cut to be swiveled. The platen 22 is now driven by the motor 40 so that the SehneidVorgang can be carried out. The circular knives 62 can be driven on the knife shaft 6h . For this purpose, an electric motor 72, which is fastened to the frame part and which is in drive connection with the cutter shaft 6h via a V-belt Jh and transmission rollers 76 and via a V-belt 78, is provided.

The device is equipped with a push-off device, which the individual pieces of the cut Pushes the tube 60 over the free end of the platen. This device consists of a piston rod 80 of a working cylinder 82 which extends in the longitudinal direction of the device and above and laterally the platen 22 is arranged. The working cylinder 82 can be reversed so that the piston rod

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can move in two directions. Are on cylinder 82 . two rollers 84 at a distance from one another and in the longitudinal direction of the device and a carriage 86 (see Fig. 3) is slidably disposed therebetween. As can be seen from Fig. 1, a rope is wound around this lump 84, one end of which is on the slide 86 and the other end of which is attached to the frame opposite the rollers over which it runs. Accordingly, when the working cylinder 82 moves in any direction, the carriage 86 moves in the same direction at twice the speed » If the carriage 86 is to be moved over the full length of the platen 22, what for pushing off the If parts are required, the working cylinder 82 only needs about half the length of the platen be moved.

The carriage 86 slides on a support 88 of the frame (see FIG. 3) by means of rollers 90 and 92. An arm 94 is also attached to the carriage 86, which is inclined downwards in the direction of the support roller 22 and the end of which carries a cup-shaped stop 96, which extends right up to the lateral surface of the platen 22.

When the carriage is moved, the shell-shaped stop 96 thus slides along the support roller 22 and thereby engages the end face of the pipe 60, which has already been cut into sections, and pushes it off the support roller 22.

The device can carry out a complete operation by simply pressing a button, with the continuous

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Working steps are as follows} When a pipe 60 is cut into sections, the circular knives 62 are set to the lengths to be cut on the knife shaft 6k and at the beginning of the work process, the circular knives 62 and pressure rollers k2 are swiveled away from the support roller 22, as is the tailstock arm 25 in the position shown in Figs. The adjacent end of the support roller 22 is thus self-supporting. The pipe is now pushed onto the support roller 22 up to an adjustable stop, which can be provided if necessary, and the start button of the device is depressed. The tailstock arm 25 is then brought into its position supporting the support roller 22, the pressure rollers k2 are pivoted inward in order to fix the pipe 60 and the circular knives 62 are guided against the outer wall of the pipe 60. The circular knives 62 are rotated, if necessary. After the cutting, the circular knives 62, the pressure rollers 42 and the tailstock arm 25 are pivoted away from the support roller 22, whereupon the carriage 86 is displaced in the longitudinal direction, the sections being pushed off the support roller 22. The carriage then returns to its starting position and the work cycle is completed and can begin again by pushing a pipe onto the support roller 22. The sequence of work steps is preferably carried out automatically, but the individual drive devices can also be switched on manually.

The embodiment described above does not impose any limitation on the scope of the invention represents the device described above, but the invention can also be used in machines of different types

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found, wherein a support roller is provided within a tube and abutting the cutting pressure rollers against the outer wall of the tube, the position of the tube is stabilized and deformations and movements DES> same, during the Sehneidvorganges, are suppressed.

Introducing the described embodiment, the screw elements are designed for the adjustment of the pressure rollers 42, pneumatic elements for the adjustment of the cutting elements and ψ been the tailstock arm and electric motors for driving the various components of the apparatus. These drive means can be replaced by other types of drive; for example, a single drive with gears and clutches can be used instead of multiple motors shown in the drawings.

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Claims (18)

193752η Godfather-n.tan sayings .j device for cutting pipes, preferably Made of cellulose, plastic or aluminum, in partial lengths, with a pipe that supports the pipe to be cut Support roller and cutting elements engaging in the pipe wall, characterized in that the support roller (22) has a maximum diameter which is smaller than the inner diameter of the pipes to be cut (60) and two pressure rollers (42) engaging the outer wall of the pipe to be cut are provided, which press the pipe onto the platen (22) during the cutting process. 2. Device according to claim 1, characterized in that that the support roller (22) is assigned a drive device 3. Device according to claim 2, characterized in that that the drive device consists of a motor (4θ), a V-belt (38) and one on the platen (22) attached pulley. 4. Device according to one or more of the claims 1 to 3 »characterized in that the pressure rollers (42) are symmetrical to one perpendicular through the axis the platen (22) extending plane are arranged. 5. Device according to claim 4, characterized in that that the pressure rollers (42) in a transverse to the axis of the 009817/0386 Support roller (22) extending direction pivotable and adjustment elements that control this pivoting movement are provided, 6. Apparatus according to claim 5 »characterized in that that the adjusting elements consist of a spindle (54) with a yoke (52) screwed onto it and laterally leading from this to each of the pressure rollers (42) and to this engaging joint rods (50) consists. 7. Apparatus according to claim 6, characterized in that that the spindle (54) is assigned a servomotor (56) is. 8. Apparatus according to claim 7 »characterized in that the servomotor {56) limit switches for limiting the pivoting movements of the printing rollers i ^ -2) are assigned. 9 · Device according to one or more of the claims 4 to 8, characterized in that the cutting elements (62) are arranged in the operating position between the pressure rollers (42). 10.Vorrichtung according to claim ° -i characterized in that that at least one circular knife (62) is provided as a cutting element, which on a parallel to Support roller extending shaft (64) is arranged. 11.Vorrichtung according to claim 10, characterized in that that the cutting element (62) is a motor (72) and a pulley on the shaft (64) 00981 7/0386 with intermediate drive belt (7 * 0 existing Drive is assigned. 12. Apparatus according to claim 10 or 11, characterized in that the shaft (64) is pivotably mounted on pivot arms {66) with an associated pivot drive. 13 · Device according to claim 12, characterized in that that the swivel drive consists of at least one pneumatically operated working cylinder (70). lh. Device according to one or more of Claims 1 to 13, characterized in that the support roller (22) is assigned a device for removing the pipe parts cut thereon. 15. Device according to claim 14, characterized in that that the device consists of a slide (9 ^ t96) reaching directly to the jacket of the platen, which can be pushed back and forth axially to the support roller (22) is, where for these movements a drive trains t is t i s t. 16. The device according to claim 15 »characterized in that that the drive for moving the slide is a pneumatically operated working cylinder (82) and a transmission device between the slide and the working cylinder is arranged, which gives the slide twice the speed of the piston movement of the working cylinder. 009817/0386 -Ί6- 17 · Device according to one or more of claims 1 to 16, characterized in that the support roller (22 ) is temporarily removable at one end in a stationary bearing (24) and at the other end in one for the application of the pipe (60) to be cut Bearing (25) is stored. 18. The device according to claim 17 »characterized in that the removable bearing (25) is provided with a" pneumatically operated working cylinder (28) movable, provided with a knee joint mechanism
Tailstock arm is, with the knee joint mechanism
the force for supporting the tailstock arm (25) acting on the end of the support roller (22) "independently of the loading of the working cylinder (28), provides" Gn / Ba 009817/0 386