CA2054685C - Process and device for cutting slots in tubular bodies - Google Patents
Process and device for cutting slots in tubular bodiesInfo
- Publication number
- CA2054685C CA2054685C CA 2054685 CA2054685A CA2054685C CA 2054685 C CA2054685 C CA 2054685C CA 2054685 CA2054685 CA 2054685 CA 2054685 A CA2054685 A CA 2054685A CA 2054685 C CA2054685 C CA 2054685C
- Authority
- CA
- Canada
- Prior art keywords
- tube
- blade
- cutting
- blades
- shafts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/0015—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor specially adapted for perforating tubes
- B26F1/0023—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor specially adapted for perforating tubes by rotary tools, e.g. saws
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetal Cutting Devices (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Turning (AREA)
- Milling Processes (AREA)
- Screw Conveyors (AREA)
Abstract
The invention relates to a process and device for cutting slots (13) in tubular bodies. the tubular bodies (2) are conveyed intermittently and slotted (13) during the stationary stages. To this end the cutter (1) has an intermittent conveyor for the tube (2), preferably in the form of at least one conveyor worm (3) with straight and oblique sections (4, 5). In addition, the cutter (1) has several blade shafts (6) rotatably arranged around the tube (2), the direction and drive of which are matched to the feed rhythm. With a larger number of blades (7), the blade shafts (6) are divided into two groups and slot the tube (2) in groups and in succession. The angular position and direction of rotation of the blade shafts (6) are mutually determined so that there is always the same number of blades in the cutting position and that the moments exerted on the tube (2) by the cutting forces are mutually compensated.
Description
205468~
The invention concerns a device for cutting slots in tubular bodies.
In practice, it is difficult to cut any desired number of slots distributed over the periphery into tubes, in particular into corrugated tubes. In this case, double-walled corrugated tubes having a smoothbore inner tube connected by welding with the shaft troughs on the inside are particularly critical. Diagonally or laterally displaced slots in the shaft troughs can damage the weld and thus make the tube partially unusable.
It is known from EP-A-0 013 626 that, to solve this problem, the cutting blade is placed on the blade shaft so that it can travel in longitudinal direction on a sliding 10 sleeve. The corrugated tube to be cut is continuously conveyed via screw threads to the blade shafts. A cam on the sleeve engages with the corrugated tube just before the cutting blade arrives and ensures that the sleeve is taken along by the continuously conveyed corrugated tube. The sleeve and corrugated tube move synchronously for a short time so that the cutting blade can cut a straight slot in the shaft trough. Once the cutting blade is disengaged, the sleeve is brought back to its original position via a retracting mechanism. As a result of the superimposed rotary and axial movement, the cutting blade carries out a helical movement. This type of a cutting device has to struggle with problems relating to the sliding sleeve with respect to wear and tear, friction, tilting etc. As BJ~
The invention concerns a device for cutting slots in tubular bodies.
In practice, it is difficult to cut any desired number of slots distributed over the periphery into tubes, in particular into corrugated tubes. In this case, double-walled corrugated tubes having a smoothbore inner tube connected by welding with the shaft troughs on the inside are particularly critical. Diagonally or laterally displaced slots in the shaft troughs can damage the weld and thus make the tube partially unusable.
It is known from EP-A-0 013 626 that, to solve this problem, the cutting blade is placed on the blade shaft so that it can travel in longitudinal direction on a sliding 10 sleeve. The corrugated tube to be cut is continuously conveyed via screw threads to the blade shafts. A cam on the sleeve engages with the corrugated tube just before the cutting blade arrives and ensures that the sleeve is taken along by the continuously conveyed corrugated tube. The sleeve and corrugated tube move synchronously for a short time so that the cutting blade can cut a straight slot in the shaft trough. Once the cutting blade is disengaged, the sleeve is brought back to its original position via a retracting mechanism. As a result of the superimposed rotary and axial movement, the cutting blade carries out a helical movement. This type of a cutting device has to struggle with problems relating to the sliding sleeve with respect to wear and tear, friction, tilting etc. As BJ~
- 2 - 205g 685 a result, cutting straight slots cannot be ensured. The structure is relatively complicated. In addition, the cutting device cannot be readily adjusted to other corrugated tubes or a different distribution with respect to the number of slots.
Furthermore, it is also known from another embodiment of the same priorart to continuously convey the corrugated tube but to stop at the cutting position at that moment when the blade goes through. The adjacent corrugated tube areas are hereby compressed or expanded, which means that the corrugated tube must have a certain elasticity. The cutting device is thereby mechanically heavily loaded, as a result of which there is in increase in the wear of the cutting blades. Due to the deformations of the corrugated tube, it is moreover not guaranteed that, despite being stopped at the cutting position, a straight slot is cut.
DE-A-29 00 261 concerns another technique for cutting openings in corrugated tubes. To accomplish this, a punch having an eccentric drive is provided. It is led off from a conveyer worm which gradually pushes the corrugated tube forward.
Still other constructions are known from US-C-3 957 386 and US-C-4 000 672 in which the corrugated tube is gradually conveyed via chain drives and the openings in the corrugated tube are cut by means of drills or saws. It is also necessary in this case, as with the previous punching, to position the tool at the corrugated tube and to pull it back again for conveying the corrugated tube further. The machine construction is complicated and expensive, whereby it is also not readily possible to control and change over to other types of corrugated tubes or other opening requirements.
It is therefore the object of the present invention to propose a device for cutting slots in tubular bodies which is very reliable and has a simple construction.
The invention provides apparatus for cutting slots (13) in a tubular body (2), said apparatus comprising: a conveying device for the tubular body, said conveying device comprising at least one continuous conveyor worm (3) that has alternating straight and oblique sections (4, 5) for engaging the tubular body and effecting intermittent axial conveyance thereof when said oblique sections (5) engage the tube; and a plurality of rotary blade shafts (6) uniformly distributed around the periphery of the tube, each blade shaft carrying thereon an axially fixed cutting 10 blade (7) which moves in a circular path upon rotation of the associated blade shaft; drive means to effect rotation of said blade shafts to bring said cutter blades into engagement with the tubular body to cut slots therein at desired locations, said drive means being synchronized with said conveying device such that said cutting blades are actuated to cut slots only during intervals when the straight sections of the conveying worm engage the tube so that the tube is axially stationary.
The cutter of the invention has the advantage of simple kinematics of the blade shafts which only rotate yet do not have to carry out movement in the longitudinal direction. As a result, the blade shafts can be simply constructed and made 20 sufficiently stable to absorb the cutting reaction forces. At the same time, this enables a reduction in the size of the cross-sections and a more compact arrangement and distribution of the blade shafts around the tube.
20~85 ,.
It is, furthermore, proposed by the invention that the tubular body, in particular, a single or multi-walled corrugated tube, be conveyed intermittently and that the slots cut while the tube is stopped. The great advantage of this is that geometric errors are practically eliminated during slotting. In addition, damage to the welded joints in multi-walled corrugated tubes can no longer occur. The axially stationary blade shafts also enable a secure grip of the tubular contour and an exact control of the cutting blade.
In order to ensure that the blade cuts only in the stationary stages, the blade shafts and the conveying device are synchronized in drive and direction. The 10 conveying device has, in the preferred embodiment for corrugated tubes, conveyor worms with straight and oblique sections which can also turn continuously. The tube is conveyed with the oblique sections, whereas it is stopped when the straight sections engage. This embodiment has - 3a -~r 205168~
the advantage of a simple, compact and sturdy construction. It can be easily varied and adapted to different tubular shapes by varying the parameters of the blade shafts and conveyor worms. The cutter can also be reset without problems.
It is furthermore advantageous that corrugated tubes having any shaft height and spacing can be slotted, whereby, from the point of kinematics, there are no constraints with respect to number and distribution of slots about the periphery and in longitudinal direction.
Each shaft trough can be provided with slots, just as every second, every third, etc.
The device can be used for any types and materials of tubular bodies.
It is especially suitable for plastic corrugated tubes in preferably double-walled form. Alternatively, the corrugated tube can also be single-walled or have any other form.
In the preferred embodiment, the blade shafts and the conveyor worms have a common drive in which, if required, a gearing is inserted. The conveyor worms can also be directly on the blade shafts which minimizes the cost and size of construction.
If only every second, third etc. shaft trough is to be slotted, then correspondingly multiple conveyor worms are used. Alternatively, the conveyor worms can also be single-threaded and converted into high speed vis-à-vis the blade shafts.
With a large number of blade shafts, it is recommended that the blades be cut in groups and chronologically staggered. Accordingly, the worm sections can have two or more straight sections. Moreover, the angular positions and directions of rotation of the blade shafts are mutually ~ 5 ~ 20a 1685 determined so as to maximize cutting forces and cutting reactions.
Preferably, the straight sections are shorter than the oblique and onlyso long as is necessary for the cutting blade to be guided and able to cut. The dimensions depend, moreover, on the shape of the tube and the cutting staggers. In the illustrated embodiment, the straight sections cover, depending on their number, one peripheral angle between 70~ and 100~ per pitch.
So that the protruding blade tips of adjacent shafts do not hinder one another, they are axially staggered. The mutual displacement is determined by the cutting staggers and is also used to cut the slots in the shaft troughs divided into two or more times.
The invention is illustrated schematically and by way of example in thedrawings, which individually show:
Fig. 1: a cutter in eccentrically cut side view, Fig. 2: a front view of the cutter corresponding to arrow II of Fig. 1, Fig. 3 a front view of the blade shaft distribution, Fig. 4 a blade shaft in side view and Figs. S and 6: cross-sections through the blade shaft.
The cutter (1) shown in Figs. 1 and 2 is used for cutting slots (13) into the troughs of a corrugated tube (2) having troughs and pitches closed in the shape of a ring. The tube is made in the form of a ~ 20~46~
double-walled corrugated tube (2) made from a thermoplastic synthetic material having a smooth inner covering and a corrugated outer covering.
A corrugated tube (2) of this type is known, for example, from DE-OS 36 05 329. Corrugated tubes are used e.g. as drain pipes for drainage or irrigation conduits.
As Figs. 1 and 2 illustrate, four conveyor worms (3) having longitudinally directed axes are uniformly distributed about the corrugated tube axis for conveying the corrugated tube (2) at the input end and outside of the housing (12). Moreover, conical friction disks act on tube (Z) at the input end, these conical friction disks rotate about the transverse axes and prevent an undesired turning of the tube (2) about its longitudinal axis. At the outlet end, there are also two similar conveyor worms (3) arranged opposite one another. At the outlet side, the corrugated tube (2) is, in addition, led along a flange (16).
To more clearly illustrate this, the corrugated tube (2) is shown only at the outlet side.
The conveyor worms (3) have one or more spirals. The conveyor worms (3) have straight sections (4) and oblique, i.e. helically wound sections (5). The individual spirals each have the straight and oblique sections (4, 5) at the same peripheral area. The straight sections (4) extend over a peripheral angle between 70~ and 100~.
When the straight sections (4) are engaged with the shaft troughs of the tube (2), there is no conveyance in axial direction (14). If the oblique sections (5) subsequently engage, then tube (2) is pushed forward during the further worm rotation about the desired length depending on the individual worm pitch. The corrugated tube (2) is then gradually conveyed.
~D 5~
, As Fig. 3 shows, several blade shafts (6) are uniformly distributed in the housing (12) all around the tube periphery. In the illustrated embodiment, there are twelve blade shafts. The blade shafts (6) extend along the conveying direction (14) and are axially fixed so that they can only rotate in their longitudinal axis. A cutting blade (7) which moves in a circular path is placed on each blade shaft (6).
The blade shafts (6) are coupled with one another and with the conveyor worms (3) in such a way that they can be activated (see Fig. 1). They are activated from the outside by a drive gear (11), for example, via a chain drive. The individual blade shafts (6) are activated by a drive shaft (15) and a distributor gear in the 10 rear part of the housing (12). The drive for the conveyor worms (3) is led off at the front end by the shaft (15). The drive transmission is laid out in such a way that, during the rotary phase during which the straight sections (4) are engaged and holding the tube, the blade shafts (6) cut the slots into the tube (2). During the subsequent remaining rotation of the conveyor worm (3), on the other hand, all of the blade shafts (6) are disengaged, so that the tube (2) can be conveyed further by means of the oblique sections (5).
The cutting blades (7) are axially staggered on adjacent blade shafts (6) in order not to collide with one another during a rotation. The mutual displacement is, preferably, directed alternately toward the front and toward the back. Its size 20 depends on the division of the corrugated tube and the desired slot spacing. If only every second trough is to be slotted, then the mutual displacement is appropriately larger than when every shaft trough is to be slotted.
B
20~468~
,_ The blade shafts (6) are also mutually staggered in their angle of rotation, i.e. the angular position of their cutting blades (7). The mutual displacement is 180~ in relation to the tube axis (14) or the engaged position with the tube (2). In this way, the cutting blades (7) engage with the tube (2) in two groups a and b, one after the other. The blade shafts (6) also rotate alternately in counter direction.
The mutual allocation of the blade shafts is here done in such a way that the torques of the cutting blades (7) which are engaged cancel each other out in order not to transmit any moments on the tube (2). It is also advantageous if the angular positions of the blade shafts (6) are selected in such a way that the same 10 number of cutting blades (7) are always engaged. Fig. 3 shows this position of the blades and the division of the blade shafts into two equally large groups (6a and 6b).
Figs. 4 - 6 show the construction of the blades (6) in detail. A single cutting blade (7), projecting at right angles to the shaft axis, is placed on each blade shaft (6).
Guide fins (8) are placed on both sides of the cutting blade (7) and in an angular position concentrically thereto, which guide fins simultaneously dip with the cutting blade (7) into the adjacent shaft troughs of the tube (2) and ensure a centering of position. The fins (8) are arched on the outside and extend over about 1/4 of the shaft circumference.
20 The fins (8) have a common, graduated base part (9) with which they are positioned in an appropriately hollowed opening of the blade shaft (6). The base part (9) is held by two outer, countersunk screws. The cutting blade (7) is - 7a -Bl~
205i 68 -~
conducted with a similar base part longitudinally displaceable with a slotted hole inside the base part (9) and blade shaft (6). The depth to which it dips is set via a screw (17) at the back, whereas the blade body is clamped by means of a setscrew (10).
With a larger number of blades, e.g. ten or twelve, the blades are staggered in two groups by 180~ as shown in the illustrated embodiment.
- 7b-B
If every second wave trough is to be slotted, then a double-threaded conveyor worm is used in which, however, each spiral now has two straight sections of about 70~, so that the one blade group engages in the first stationary pause and the other blade group engages in the second stationary pause.
The double arrangement of the straight sections requires relatively large pitch angles on the oblique sections which could lead to problems with narrow shaft troughs. This can be overcome by using single-threaded conveyer worms having only one straight section and a flatter pitch which, in turn, run twice as quickly as the blade shafts due to a conversion in the common drive. The conveyor worms are located, in both cases, at the front of the cutting device.
A blade displacement of 180~ is also required with ten or twelve rows of slots and slotting in each shaft trough. The conveyor worms can have two straight sections on one spiral without geometric problems due to the slighter pitch in this case. Thus, a worm arrangement inside the housing is also possible.
In another embodiment, which is not shown, six blade shafts are provided. With this number, all blades can cut simultaneously. If every second shaft trough is to be slotted so as to be staggered, the conveyor worms are double-spiralled, whereby each spiral has a straight section of about 100~ over a 360~ peripheral angle. The conveyor worms are located directly on the blade shafts and are thereby located inside or outside of the housing.
In a variation of the above embodiment, six rows of slots are also cut,this time, however, in every shaft trough. The blade shafts must now ~ 9 ~ 2054 685 run twice as quickly, whereby all blades cut at the same time. The conveyor worms are again located on the blade shafts, but are single-spiralled in this case. The straight sections extend over about l ooo .
In a variation of the above examples, tubes of other shapes, for example, corrugated tubes with helical troughs and pitches can be worked with the method of the invention and the appropriate cutting device adapted to the respective tube shape. The straight sections with appropriate dimensions are then used for conveying, whereas the oblique sections take care of the intermittent stationary position. For helical corrugated tubes, the blades are axially staggered corresponding to the pitch.
10 ~ 2 0 5 4 6 8 r~
P A R T S L I S T
1 Cutting device 2 Tube, corrugated tube, tubular body 3 Conveyor worm 4 Straight section Oblique section 6 Blade shaft 7 Cutting blade 8 Guide fin 9 Base part Setscrew 11 Driving wheel 12 Housing 13 Slot 14 Longitudinal axis, direction of conveyance Drive shaft 16 Flange 17 Screw
Furthermore, it is also known from another embodiment of the same priorart to continuously convey the corrugated tube but to stop at the cutting position at that moment when the blade goes through. The adjacent corrugated tube areas are hereby compressed or expanded, which means that the corrugated tube must have a certain elasticity. The cutting device is thereby mechanically heavily loaded, as a result of which there is in increase in the wear of the cutting blades. Due to the deformations of the corrugated tube, it is moreover not guaranteed that, despite being stopped at the cutting position, a straight slot is cut.
DE-A-29 00 261 concerns another technique for cutting openings in corrugated tubes. To accomplish this, a punch having an eccentric drive is provided. It is led off from a conveyer worm which gradually pushes the corrugated tube forward.
Still other constructions are known from US-C-3 957 386 and US-C-4 000 672 in which the corrugated tube is gradually conveyed via chain drives and the openings in the corrugated tube are cut by means of drills or saws. It is also necessary in this case, as with the previous punching, to position the tool at the corrugated tube and to pull it back again for conveying the corrugated tube further. The machine construction is complicated and expensive, whereby it is also not readily possible to control and change over to other types of corrugated tubes or other opening requirements.
It is therefore the object of the present invention to propose a device for cutting slots in tubular bodies which is very reliable and has a simple construction.
The invention provides apparatus for cutting slots (13) in a tubular body (2), said apparatus comprising: a conveying device for the tubular body, said conveying device comprising at least one continuous conveyor worm (3) that has alternating straight and oblique sections (4, 5) for engaging the tubular body and effecting intermittent axial conveyance thereof when said oblique sections (5) engage the tube; and a plurality of rotary blade shafts (6) uniformly distributed around the periphery of the tube, each blade shaft carrying thereon an axially fixed cutting 10 blade (7) which moves in a circular path upon rotation of the associated blade shaft; drive means to effect rotation of said blade shafts to bring said cutter blades into engagement with the tubular body to cut slots therein at desired locations, said drive means being synchronized with said conveying device such that said cutting blades are actuated to cut slots only during intervals when the straight sections of the conveying worm engage the tube so that the tube is axially stationary.
The cutter of the invention has the advantage of simple kinematics of the blade shafts which only rotate yet do not have to carry out movement in the longitudinal direction. As a result, the blade shafts can be simply constructed and made 20 sufficiently stable to absorb the cutting reaction forces. At the same time, this enables a reduction in the size of the cross-sections and a more compact arrangement and distribution of the blade shafts around the tube.
20~85 ,.
It is, furthermore, proposed by the invention that the tubular body, in particular, a single or multi-walled corrugated tube, be conveyed intermittently and that the slots cut while the tube is stopped. The great advantage of this is that geometric errors are practically eliminated during slotting. In addition, damage to the welded joints in multi-walled corrugated tubes can no longer occur. The axially stationary blade shafts also enable a secure grip of the tubular contour and an exact control of the cutting blade.
In order to ensure that the blade cuts only in the stationary stages, the blade shafts and the conveying device are synchronized in drive and direction. The 10 conveying device has, in the preferred embodiment for corrugated tubes, conveyor worms with straight and oblique sections which can also turn continuously. The tube is conveyed with the oblique sections, whereas it is stopped when the straight sections engage. This embodiment has - 3a -~r 205168~
the advantage of a simple, compact and sturdy construction. It can be easily varied and adapted to different tubular shapes by varying the parameters of the blade shafts and conveyor worms. The cutter can also be reset without problems.
It is furthermore advantageous that corrugated tubes having any shaft height and spacing can be slotted, whereby, from the point of kinematics, there are no constraints with respect to number and distribution of slots about the periphery and in longitudinal direction.
Each shaft trough can be provided with slots, just as every second, every third, etc.
The device can be used for any types and materials of tubular bodies.
It is especially suitable for plastic corrugated tubes in preferably double-walled form. Alternatively, the corrugated tube can also be single-walled or have any other form.
In the preferred embodiment, the blade shafts and the conveyor worms have a common drive in which, if required, a gearing is inserted. The conveyor worms can also be directly on the blade shafts which minimizes the cost and size of construction.
If only every second, third etc. shaft trough is to be slotted, then correspondingly multiple conveyor worms are used. Alternatively, the conveyor worms can also be single-threaded and converted into high speed vis-à-vis the blade shafts.
With a large number of blade shafts, it is recommended that the blades be cut in groups and chronologically staggered. Accordingly, the worm sections can have two or more straight sections. Moreover, the angular positions and directions of rotation of the blade shafts are mutually ~ 5 ~ 20a 1685 determined so as to maximize cutting forces and cutting reactions.
Preferably, the straight sections are shorter than the oblique and onlyso long as is necessary for the cutting blade to be guided and able to cut. The dimensions depend, moreover, on the shape of the tube and the cutting staggers. In the illustrated embodiment, the straight sections cover, depending on their number, one peripheral angle between 70~ and 100~ per pitch.
So that the protruding blade tips of adjacent shafts do not hinder one another, they are axially staggered. The mutual displacement is determined by the cutting staggers and is also used to cut the slots in the shaft troughs divided into two or more times.
The invention is illustrated schematically and by way of example in thedrawings, which individually show:
Fig. 1: a cutter in eccentrically cut side view, Fig. 2: a front view of the cutter corresponding to arrow II of Fig. 1, Fig. 3 a front view of the blade shaft distribution, Fig. 4 a blade shaft in side view and Figs. S and 6: cross-sections through the blade shaft.
The cutter (1) shown in Figs. 1 and 2 is used for cutting slots (13) into the troughs of a corrugated tube (2) having troughs and pitches closed in the shape of a ring. The tube is made in the form of a ~ 20~46~
double-walled corrugated tube (2) made from a thermoplastic synthetic material having a smooth inner covering and a corrugated outer covering.
A corrugated tube (2) of this type is known, for example, from DE-OS 36 05 329. Corrugated tubes are used e.g. as drain pipes for drainage or irrigation conduits.
As Figs. 1 and 2 illustrate, four conveyor worms (3) having longitudinally directed axes are uniformly distributed about the corrugated tube axis for conveying the corrugated tube (2) at the input end and outside of the housing (12). Moreover, conical friction disks act on tube (Z) at the input end, these conical friction disks rotate about the transverse axes and prevent an undesired turning of the tube (2) about its longitudinal axis. At the outlet end, there are also two similar conveyor worms (3) arranged opposite one another. At the outlet side, the corrugated tube (2) is, in addition, led along a flange (16).
To more clearly illustrate this, the corrugated tube (2) is shown only at the outlet side.
The conveyor worms (3) have one or more spirals. The conveyor worms (3) have straight sections (4) and oblique, i.e. helically wound sections (5). The individual spirals each have the straight and oblique sections (4, 5) at the same peripheral area. The straight sections (4) extend over a peripheral angle between 70~ and 100~.
When the straight sections (4) are engaged with the shaft troughs of the tube (2), there is no conveyance in axial direction (14). If the oblique sections (5) subsequently engage, then tube (2) is pushed forward during the further worm rotation about the desired length depending on the individual worm pitch. The corrugated tube (2) is then gradually conveyed.
~D 5~
, As Fig. 3 shows, several blade shafts (6) are uniformly distributed in the housing (12) all around the tube periphery. In the illustrated embodiment, there are twelve blade shafts. The blade shafts (6) extend along the conveying direction (14) and are axially fixed so that they can only rotate in their longitudinal axis. A cutting blade (7) which moves in a circular path is placed on each blade shaft (6).
The blade shafts (6) are coupled with one another and with the conveyor worms (3) in such a way that they can be activated (see Fig. 1). They are activated from the outside by a drive gear (11), for example, via a chain drive. The individual blade shafts (6) are activated by a drive shaft (15) and a distributor gear in the 10 rear part of the housing (12). The drive for the conveyor worms (3) is led off at the front end by the shaft (15). The drive transmission is laid out in such a way that, during the rotary phase during which the straight sections (4) are engaged and holding the tube, the blade shafts (6) cut the slots into the tube (2). During the subsequent remaining rotation of the conveyor worm (3), on the other hand, all of the blade shafts (6) are disengaged, so that the tube (2) can be conveyed further by means of the oblique sections (5).
The cutting blades (7) are axially staggered on adjacent blade shafts (6) in order not to collide with one another during a rotation. The mutual displacement is, preferably, directed alternately toward the front and toward the back. Its size 20 depends on the division of the corrugated tube and the desired slot spacing. If only every second trough is to be slotted, then the mutual displacement is appropriately larger than when every shaft trough is to be slotted.
B
20~468~
,_ The blade shafts (6) are also mutually staggered in their angle of rotation, i.e. the angular position of their cutting blades (7). The mutual displacement is 180~ in relation to the tube axis (14) or the engaged position with the tube (2). In this way, the cutting blades (7) engage with the tube (2) in two groups a and b, one after the other. The blade shafts (6) also rotate alternately in counter direction.
The mutual allocation of the blade shafts is here done in such a way that the torques of the cutting blades (7) which are engaged cancel each other out in order not to transmit any moments on the tube (2). It is also advantageous if the angular positions of the blade shafts (6) are selected in such a way that the same 10 number of cutting blades (7) are always engaged. Fig. 3 shows this position of the blades and the division of the blade shafts into two equally large groups (6a and 6b).
Figs. 4 - 6 show the construction of the blades (6) in detail. A single cutting blade (7), projecting at right angles to the shaft axis, is placed on each blade shaft (6).
Guide fins (8) are placed on both sides of the cutting blade (7) and in an angular position concentrically thereto, which guide fins simultaneously dip with the cutting blade (7) into the adjacent shaft troughs of the tube (2) and ensure a centering of position. The fins (8) are arched on the outside and extend over about 1/4 of the shaft circumference.
20 The fins (8) have a common, graduated base part (9) with which they are positioned in an appropriately hollowed opening of the blade shaft (6). The base part (9) is held by two outer, countersunk screws. The cutting blade (7) is - 7a -Bl~
205i 68 -~
conducted with a similar base part longitudinally displaceable with a slotted hole inside the base part (9) and blade shaft (6). The depth to which it dips is set via a screw (17) at the back, whereas the blade body is clamped by means of a setscrew (10).
With a larger number of blades, e.g. ten or twelve, the blades are staggered in two groups by 180~ as shown in the illustrated embodiment.
- 7b-B
If every second wave trough is to be slotted, then a double-threaded conveyor worm is used in which, however, each spiral now has two straight sections of about 70~, so that the one blade group engages in the first stationary pause and the other blade group engages in the second stationary pause.
The double arrangement of the straight sections requires relatively large pitch angles on the oblique sections which could lead to problems with narrow shaft troughs. This can be overcome by using single-threaded conveyer worms having only one straight section and a flatter pitch which, in turn, run twice as quickly as the blade shafts due to a conversion in the common drive. The conveyor worms are located, in both cases, at the front of the cutting device.
A blade displacement of 180~ is also required with ten or twelve rows of slots and slotting in each shaft trough. The conveyor worms can have two straight sections on one spiral without geometric problems due to the slighter pitch in this case. Thus, a worm arrangement inside the housing is also possible.
In another embodiment, which is not shown, six blade shafts are provided. With this number, all blades can cut simultaneously. If every second shaft trough is to be slotted so as to be staggered, the conveyor worms are double-spiralled, whereby each spiral has a straight section of about 100~ over a 360~ peripheral angle. The conveyor worms are located directly on the blade shafts and are thereby located inside or outside of the housing.
In a variation of the above embodiment, six rows of slots are also cut,this time, however, in every shaft trough. The blade shafts must now ~ 9 ~ 2054 685 run twice as quickly, whereby all blades cut at the same time. The conveyor worms are again located on the blade shafts, but are single-spiralled in this case. The straight sections extend over about l ooo .
In a variation of the above examples, tubes of other shapes, for example, corrugated tubes with helical troughs and pitches can be worked with the method of the invention and the appropriate cutting device adapted to the respective tube shape. The straight sections with appropriate dimensions are then used for conveying, whereas the oblique sections take care of the intermittent stationary position. For helical corrugated tubes, the blades are axially staggered corresponding to the pitch.
10 ~ 2 0 5 4 6 8 r~
P A R T S L I S T
1 Cutting device 2 Tube, corrugated tube, tubular body 3 Conveyor worm 4 Straight section Oblique section 6 Blade shaft 7 Cutting blade 8 Guide fin 9 Base part Setscrew 11 Driving wheel 12 Housing 13 Slot 14 Longitudinal axis, direction of conveyance Drive shaft 16 Flange 17 Screw
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for cutting slots (13) in a tubular body (2), said apparatus comprising:
a conveying device for the tubular body, said conveying device comprising at least one continuous conveyor worm (3) that has alternating straight and oblique sections (4, 5) for engaging the tubular body and effecting intermittent axial conveyance thereof when said oblique sections (5) engage the tube; and a plurality of rotary blade shafts (6) uniformly distributed around the periphery of the tube, each blade shaft carrying thereon an axially fixed cutting blade (7) which moves in a circular path upon rotation of the associated blade shaft;
drive means to effect rotation of said blade shafts to bring said cutter blades into engagement with the tubular body to cut slots therein at desired locations, said drive means being synchronized with said conveying device such that said cutting blades are actuated to cut slots only during intervals when the straight sections of the conveying worm engage the tube so that the tube is axially stationary.
a conveying device for the tubular body, said conveying device comprising at least one continuous conveyor worm (3) that has alternating straight and oblique sections (4, 5) for engaging the tubular body and effecting intermittent axial conveyance thereof when said oblique sections (5) engage the tube; and a plurality of rotary blade shafts (6) uniformly distributed around the periphery of the tube, each blade shaft carrying thereon an axially fixed cutting blade (7) which moves in a circular path upon rotation of the associated blade shaft;
drive means to effect rotation of said blade shafts to bring said cutter blades into engagement with the tubular body to cut slots therein at desired locations, said drive means being synchronized with said conveying device such that said cutting blades are actuated to cut slots only during intervals when the straight sections of the conveying worm engage the tube so that the tube is axially stationary.
2. Apparatus according to claim 1 wherein the conveyor worms (3) are placed on the blade shafts (6).
3. Apparatus according to claim 1 wherein a plurality of conveyor worms on individual shafts are driven conjointly.
4. Apparatus according to any one of claims 1 to 3 wherein the or each conveyor worm is of helical form and has at least one straight section in each 360 degrees.
5. Apparatus according to any one of claims 1 to 4 wherein the straight sections extend over a peripheral angle of between about 70 and 100 degrees.
6. Apparatus according to any one of claims 1 to 5 wherein the or each conveyor worm has parallel multiple helixes thereon, each helix having at least one straight section and at least one oblique section in each 360 degrees thereof.
7. Apparatus according to any one of claims 1 to 6 wherein each cutting blade extends at right angles to the longitudinal axis of the associated blade shaft and has spaced to each side thereof a projecting guide fin extending in a plane at right angles to the longitudinal axis of the blade shaft.
8. Apparatus according to any one of claims 1 to 7 wherein the cutting blades of alternate blade shafts are axially staggered.
9. Apparatus according to any one of claims 1 to 8 wherein the rotational positions of the various blade shafts are preset such that their associated cutting blades cut into the tube at different times.
10. Apparatus according to claim 9 wherein the blade shafts are controlled in their angular positions and direction of rotation such that at any one time the tube is cut by an equal number of blades rotating in one direction and blades rotating in the opposite direction.
11. Apparatus according to claim 9 or 10 wherein successive cutting blades are at angular orientations offset from each other by 180 degrees, the blades being arranged in two groups which are brought into cutting position alternately.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3914779.7 | 1989-05-05 | ||
| DE19893914779 DE3914779A1 (en) | 1989-05-05 | 1989-05-05 | METHOD AND DEVICE FOR CUTTING SLOTS INTO TUBULAR BODIES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2054685A1 CA2054685A1 (en) | 1990-11-10 |
| CA2054685C true CA2054685C (en) | 1998-02-17 |
Family
ID=6380113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2054685 Expired - Fee Related CA2054685C (en) | 1989-05-05 | 1990-05-02 | Process and device for cutting slots in tubular bodies |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0472551A1 (en) |
| JP (1) | JPH0710518B2 (en) |
| CA (1) | CA2054685C (en) |
| DE (1) | DE3914779A1 (en) |
| WO (1) | WO1990013400A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4316146A1 (en) * | 1993-05-14 | 1994-11-17 | Wolfgang Gottbehuet | Working method for making a slit, a groove or the like in a body made of plastics and cutting tool for carrying out the said method |
| DE4332123A1 (en) * | 1993-09-22 | 1995-03-23 | Wilhelm Hegler | Device for sawing slots in corrugated and composite pipes |
| DE19609693A1 (en) * | 1996-03-13 | 1997-09-18 | Ralph Peter Dr Ing Hegler | Method and device for cutting slots in plastic pipes |
| DE102006032861A1 (en) * | 2006-07-14 | 2008-01-17 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Production of openings in a metal foil and honeycomb body produced therewith for the treatment of exhaust gas |
| CN103241506A (en) * | 2013-05-28 | 2013-08-14 | 赵剑毅 | Feeding device |
| CA3068832A1 (en) | 2017-07-07 | 2019-01-10 | Inno-Spin LLC | Slew-actuated piercing of radial wall |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2051087A1 (en) * | 1970-10-17 | 1972-06-22 | Th. Kieserling & Albrecht, 5650 Solingen | Method for feeding round workpieces that rotate about their longitudinal axis during processing to processing machines, in particular straightening machines |
| FR2250621B1 (en) * | 1973-11-12 | 1977-06-03 | Valsemey Pierre | |
| US3957386A (en) * | 1975-02-18 | 1976-05-18 | Lupke Manfred Arno Alfred | Corrugated tubing perforating machine |
| US4000672A (en) * | 1976-02-26 | 1977-01-04 | Altair National Corporation | Slitting machine for corrugated pipe |
| FR2356492A1 (en) * | 1976-07-03 | 1978-01-27 | Hegler Wilhelm | DEVICE FOR CUTTING OPENINGS SPACED IN ANY MANNER IN TUBES SMOOTH INSIDE AND / OR OUTSIDE OR PROVIDED WITH TRANSVERSAL WAVES INSIDE AND / OR OUTSIDE AND IRRIGATION TUBE PROVIDED WITH '' OPENINGS THUS CUT |
| US4052880A (en) * | 1976-08-10 | 1977-10-11 | Noah E. Foulks | Pipe perforating machine |
| CA1060775A (en) * | 1977-03-18 | 1979-08-21 | Manfred A.A. Lupke | Apparatus for perforating tubing |
| CA1119090A (en) * | 1979-01-11 | 1982-03-02 | Manfred A. A. Lupke | Apparatus and method for perforating tubing |
| CA1187399A (en) * | 1981-12-28 | 1985-05-21 | Manfred A.A. Lupke | Rotary cutter assembly |
| DE3200081A1 (en) * | 1982-01-05 | 1983-07-14 | Hegler, Wilhelm, 8730 Bad Kissingen | DEVICE FOR CUTTING OPENINGS INTO PIPES |
| DE3243625C2 (en) * | 1982-11-25 | 1986-10-23 | Metallwarenfabrik König GmbH, 7560 Gaggenau | Punching device for producing rows of holes on the circumference of a pipe |
-
1989
- 1989-05-05 DE DE19893914779 patent/DE3914779A1/en not_active Ceased
-
1990
- 1990-05-02 CA CA 2054685 patent/CA2054685C/en not_active Expired - Fee Related
- 1990-05-02 EP EP19900906927 patent/EP0472551A1/en not_active Withdrawn
- 1990-05-02 WO PCT/EP1990/000704 patent/WO1990013400A1/en not_active Application Discontinuation
- 1990-05-02 JP JP2506585A patent/JPH0710518B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0710518B2 (en) | 1995-02-08 |
| CA2054685A1 (en) | 1990-11-10 |
| DE3914779A1 (en) | 1990-11-08 |
| EP0472551A1 (en) | 1992-03-04 |
| WO1990013400A1 (en) | 1990-11-15 |
| JPH04504984A (en) | 1992-09-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |