EP1344616A1 - Apparatus for removing continuous web edge trim by suction - Google Patents

Abstract

Edge strip (2) is trimmed from a continuous fabric (3) by a rotary cutter (6) and removed by a suction duct (10). Hinged, spring-loaded (27) feeler (15) is deflected if there is a region (33) where the strip has not been correctly cut so that is entrained with the fabric and is being pulled out of the suction duct (10). Feeler (15) is linked to a sensor (25) that provides a warning signal (30, 31) or stops the motion (32) of the fabric (3). Preferred Features: The position of the feeler (15) can be adjusted where it projects over the end of the suction duct (10). The sensor (25) can be an electrical switch, or an inductive or capacitance proximity switch. The suction duct (10) ends in a compressed air jet (12) that produces the suction.

Description

The invention relates to a device for suctioning a of a running web, in particular one Textile web separated edge strip, according to the preamble of claim 1.

From practice it is known that in the refinement of Goods webs on both edge areas on needle chains needled and stretched with them transversely to the direction of web travel becomes. Through these needle chains in the Edge areas of the web a variety of holes, so that this area of the web is no longer used can. It is therefore necessary to remove the edge strips from sever the web. This is generally a rotating circular knife used, the axis of rotation transverse is aligned to the direction of the web. The severed Edge strip is then by means of a Suction stream drawn into an intake pipe, which the knife - seen in the direction of web travel - is subordinate. This known device has proven itself well in practice. However, it has been found that in rare cases the knife did not completely edge the edge strip from the rest Goods web separates. In this case, the already part of the edge strip located in the intake pipe again pulled out of this. In particular, that this pulled out edge strip catches the needle chain and this or its deflection can damage.

DE 198 60 425 C1 describes a device for separating of cover and filler materials during assembly known from quilts. This device exhibits an intake pipe for an edge strip in which a arranged as a light barrier sensor line is. This sensor line indicates whether an edge strip in the pipe was pulled in.

DE 20 12 279 A describes a suction device and removing a cut edge of a material strip, especially textile tape, on textile finishing machines known. To generate the required suction flow a Venturi nozzle is used in the the intake pipe opens.

Finally, DE 82 07 236 U1 is a device for vacuuming the edge strips cut from material webs, especially by slitting and creasing machines trimmed edge strips of a corrugated cardboard web known. This device has a pivotable Intake pipe, which has a square cross section has.

The invention has for its object a device of the type mentioned at the beginning with which Incidents are reliably recognizable.

This object is achieved with the features of Claim 1 solved.

The device according to claim 1 is used to suction a of a running web, in particular a textile web separated edge strip. A detachment of the edge strip for example, may be required if this is damaged by a needle chain or by a upstream process was frayed. To separate the Edge strips from the rest of the web are preferred a knife is used, which in particular as a rotating Circular knife is formed. To achieve an optimal The cutting effect is the axis of rotation of this circular knife parallel to the web plane and perpendicular to the web running direction aligned. So that the separated edge strip the transport and further processing of the web not disturbing, this is done by means of a suction nozzle drawn into an intake pipe. This intake pipe is - seen in the direction of web travel - the intersection of the knife downstream. It is preferably at the intersection of the knife aligned so that the separated Edge strips with only a slight deflection and therefore special is easily pulled into the intake pipe. Usually the intake pipe opens into an air-permeable tube Waste bin that is from the web detached edge strips for disposal. The Edge strips of the web cannot at certain points complete separation by the knife from the Intake pipe are pulled out. Because this pulled out Edge strips can damage the system, it is important to be able to recognize this accident. To For this purpose, there is a mechanical feel on the intake pipe Sensor provided that can detect this fault. This mechanically probing sensor is used by at least one Held in a position in which he over the free end of the intake pipe protrudes. The mechanically groping Sensor is also adjustable, being correct edge strip tapering from this to the suction pipe is not touched. If the device is working properly the mechanically probing sensor remains in its protruding beyond the free end of the intake pipe Location. In contrast, the edge strip of the web by the mechanically probing sensor by a predetermined Deflected minimum angle, this exercises on the mechanical probing feelers a corresponding force that this adjusted against the force of the spring. Such Deflection of the edge strip of the web on mechanically groping feelers come especially in those Cases where the margin is not complete was separated from the rest of the web or in which the edge strip has caught on the pin chain. Around register the adjustment of the mechanically probing sensor to be able to do so, it stands with a corresponding Sensor in active connection. This sensor generates a signal which is the pulling out of the edge strip from the Intake pipe displays. This signal can be in many different ways Way to increase the operational safety of the Device are used.

To achieve high mechanical sensitivity groping feeler, it is favorable if this possible is held on the intake pipe with low friction. This will be the easiest achieved according to claim 2 in that the mechanically probing sensors are held pivotably on the suction pipe is. A pivot bearing can be constructed with little Realize effort very simply with little friction, so that the device creates a particularly compact overall can be.

In a preferred development of the device according to Claim 3 is the mechanically probing sensor in one approximately parallel to the plane of the web and approximately perpendicular pivot axis aligned to the web running direction. The pivot axis is preferably located in an area of the intake pipe facing away from the web. This results in that facing the web Area of the mechanically probing sensor one maximum responsiveness, so this overall works very sensitively.

Alternatively, it is advantageous according to claim 4 if the mechanically probing sensors slidably held on the suction pipe is. In this case, the mechanical a separate sliding guide is created by probing sensors be, but this has the advantage that the mechanical probing sensors regardless of the direction in which the Edge strip is drawn over this, a constant responsiveness having. In particular, the responsiveness of the mechanically probing sensor regardless of its installation position.

As a rule, the severed edge strip is in the direction of web travel pulled along the web edge. To ensure, that the mechanically probing sensor the Edge strips regardless of their position transverse to the direction of web travel detected, it is favorable according to claim 5, if the mechanically probing sensor at least that of the web overlaps the facing side of the intake pipe. On the other sides of the intake pipe can also do this to be gripped by the mechanically probing sensor in order to improve surveillance, but this is not essential necessary.

To the suction flow within the intake pipe in none Way to hinder, it is advantageous according to claim 6 if the mechanically probing sensor on the outside of the intake pipe is held. This ensures that none Parts of the mechanically probing sensor or of it Bearing protrude into the intake duct and thus the air flow can adversely affect.

To adjust the mechanical generated by the sensor Process the corresponding signal using the probe To be able to, it is advantageous according to claim 7 when the sensor is adjusting the mechanically probing sensor converted into an electrical signal.

Preferred embodiments of the sensor result from claim 8. In particular, it is thought of the sensor in Realize form of an electrical switch, especially the sensor only provides a pure yes-no decision got to. So it is not necessary to adjust or Adjustment angle of the mechanically probing sensor as a proportional value to detect, so that an electrical switch is sufficient as a sensor. So that can the device is particularly simple and robust at the same time build up so that it is less prone to failure overall. Alternatively, the sensor could also be an inductive or capacitive one Proximity sensor to be formed characterized by the absence of any moving parts. This is particularly advantageous in areas where the air is heavily polluted by dust or flakes of the web is. A proximity sensor is compared to such Dirt relatively insensitive.

In general, it is not desirable to use the entire production line a web of goods when an eliminable occurs Switch off in the event of a fault. In particular, would this lead to an unacceptably high committee, especially since in this case, the web in baths for far too long partly aggressive chemicals or in one Dryer would be exposed to a very high temperature. It is therefore cheaper if, according to claim 9, the sensor is in operative connection with a warning device. In particular is thought that the warning device is a emits an acoustic and / or optical signal. This warning device warns the operator so that this can take appropriate countermeasures. For example could pull out of the intake pipe Part of the edge strip of the web simply cut off be, so that this again by the suction flow in the suction pipe is sucked in.

Alternatively or additionally, according to claim 10, to connect the sensor with drives of the web. In particular, it is thought of the web running speed to slow down in the event of an accident, so that the operating personnel have correspondingly more time fix the error. It also slows down of the web run also the cutting of the not completely detached edge strip from the web easier. Alternatively, the sensor could also shutdown of the drives of the material web do what, however to a correspondingly large committee in production leads.

In order to make the construction of the device particularly simple, it is favorable according to claim 11 if the sensor contains the feather. Especially when an electrical Switch used as a sensor is a corresponding one Spring already built into this so this also advantageously used to pretension the sensor can be.

Finally, it is advantageous according to claim 12 if the suction pipe into a pressurizable nozzle empties. This nozzle easily produces the required one Suction flow, which is used for sucking in the separated Edge strip ensures. Preferably the nozzle is as Venturi nozzle designed to be as efficient as possible Achieve suction. Is the free end of the Intake pipe sufficiently close to the knife, that's enough In this way, suction flow generated from the knife automatically suck in the separated edge strips of the web. The edge strip is threaded into the intake pipe is generally not required.

The subject matter of the invention is exemplified by the Drawing explained without restricting the scope of protection.

Figur 1

eine räumliche Darstellung einer Vorrichtung zum Absaugen eines von einer laufenden Warenbahn abgetrennten Randstreifens bei ordnungsgemäßer Funktion und

Figur 2

die Vorrichtung gemäß Figur 1 beim Auftreten eines Störfalls.

It shows:

Figure 1

a three-dimensional representation of a device for suction of an edge strip separated from a running web with proper function and

Figure 2

the device of Figure 1 when an accident occurs.

FIG. 1 shows a device 1 for extracting a Edge strip 2, which is separated from a running web 3 has been. The web 3 is not shown Rolls transported in the web running direction 4. In a previous processing step of the web 3 this was on both edge strips 2 on a needle chain needled to make them transverse to the direction of web travel 4 to tension. These pin chains are in the edge strips 2 of the web 3 holes 5 were created, so that the edge strips 2 of the web 3 are no longer used can be. It is therefore necessary to make these border strips 2 separate from the rest of the web 3.

For this purpose, a circular knife 6 is provided, which by a Motor, not shown, driven in the direction of rotation 7 is. This circular knife 6 dips with a cutting edge 8 in the web 3 and in this way separates the Edge strips 2 from the remaining web 3. A wave 6a of the circular knife 6 is perpendicular to the web running direction 4 and aligned parallel to the plane of the web 3. On Another circular knife is provided on the underside of the web, which is aligned with the circular knife 6 overlapping is to ensure a high level of cut security.

To prevent the detached edge strip 2 from disturbing further transport of the web 3, this will by means of the device 1 from a suction flow 9 in Intake pipe 10 pulled. On this intake pipe 10 is the output side a hose 10a connected, which in one not shown, air-permeable waste container opens, which receives the edge strip 2. The hose 10a opens into a connected to a compressed air line 11 Venturi nozzle 12. Via this compressed air line 11 Blown compressed air in direction 13 into the Venturi nozzle 12. Due to the action of the Venturi nozzle 12, the air entrained in the hose 10a, so that in the intake pipe 10 Suction stream 9 arises.

To ensure that the separated edge strip 2 is correctly drawn into the intake pipe 10, this is aligned at an acute angle β to the web running direction 4. Viewed in projection perpendicular to the plane of the web 3, the suction pipe 10 is aligned with the direction of web travel 4. Alternatively, the intake pipe 10 could also be aligned perpendicular to the web running direction 4. Moreover there is the free end 14 of the intake pipe 10 near the intersection 37 of the circular knife 6, so that also when pulling in a new web 3 the beginning of Edge strip 2 easily drawn into the intake pipe 10 becomes. Through this orientation of the intake pipe 10 to Intersection 37 of the circular knife 6 is particularly ensured that the separated edge strip 2 of the web 3 between the circular knife 6 and the free end 14 of the intake pipe 10 is deflected only slightly.

If the separated edge strip 2 is on an underlying one Pin chain caught or from circular knife 6 was not completely separated from the web 3, exists the risk that the edge strip 2 damage the web 3 or other processing devices such as the needle chain or its deflection caused. Because of this, it is important to recognize to be able to determine whether the separated edge strip 2 is correct approaches the intake pipe 10.

For this purpose, a mechanically groping is on the intake pipe 10 Sensor 15 provided that a pivot bearing 16 is held pivotably about a pivot axis 17. The pivot axis 17 is parallel to the plane of the web 3 and aligned perpendicular to the web running direction 4 and it is in one of the web 3 area 18 facing away from the intake pipe 10. On this This ensures that the sensor 15 in one area 19 near the web 3 a relatively large adjustment movement experiences. This is important because in this area 19 of the sensor 15 is not properly to the intake pipe 10 tapering edge strips 2 attacks. For this Reason overlaps the sensor 15 in the intake pipe 10 the area 19 assigned to the web 3 completely. Moreover is the sensor 15 in this area 19 by one Distance 21 over the free end 14 of the intake pipe 10 about.

To prevent the intake behavior of the intake pipe 10 by attaching the pivot bearing 16 of the sensor 15 changed, this is not directly on the intake pipe 10 but attached to a separate tube 22. This tube 22 overlaps the intake pipe 10 and ends flush with this. For fixing of the tube 22 screws 23 are provided, which in threaded holes of the tube 22 engage. These screws 23 press butt against an outside 24 of the intake pipe 10, so that the screws 23 the suction behavior of the Intake pipe 10 can not affect in any way.

To detect a pivoting movement of the sensor 15 can, a sensor 25 is held on the tube 22. This Sensor 25 is used to achieve optimal responsiveness usually on the underside of the intake pipe 22 may be provided. In Figure 1 it is only for the purpose a better visibility shown laterally on the tube 22. The sensor 25 has a swivel arm 26 which is loaded by a spring 27 against the sensor 15. This Spring 27 thus presses the sensor 15 into that in FIG. 1 shown location. The sensor 25 has an electrical one Switch contact 28 on the adjustment movement of the sensor 15 converted into an electrical signal.

The electrical output from the electrical switch contact 28 Signal is via a signal path 29, an acoustic 30 and an optical warning device 31 supplied. The operating personnel are informed about these warning devices 30, 31 informed about an accident. additionally a motor 32 is connected to the signal path 29, the is connected to rollers, not shown, which the Transport web 3.

In the situation shown in Figure 1, the edge strip runs 2 properly in the intake pipe 10. In In this case, the two warning devices 30, 31 are inactive and motor 32 is driven to rotate.

Deviating from the embodiment of Figure 1 could the sensor 25 also only with the acoustic warning device and / or the optical warning device 31 be connected so that the device 1 the transport the web 3 in no way affected. In this In this case, the operating personnel must report the accident in good time remedy to prevent damage to the system. It is also conceivable to use the sensor 25 only with the drive motor 32 to connect so that the operating personnel due to the suddenly braked or stopped web 3 attention is drawn to the accident.

At the opposite edge area of the web 3 is the same device 1 is provided in mirror image. This is used to separate and suck in the opposite one Edge strip 2 from the web 3.

FIG. 2 shows the representation according to FIG. 1 when it occurs an accident, the same reference numerals being the same Name parts. In an area 33 of the web 3 was the edge strip 2 is not completely off the web 3 separated so that the edge strip 2 with the current web 3 is taken. The edge strip 2 is therefore pulled out of the intake pipe 10 in the direction 34 and can, for example, on an underlying one Catch the needle chain and damage it or its deflection.

Due to the transport of the web 3 in the running direction 4 runs the section pulled out of the intake pipe 10 35 of the edge strip 2 not tangential to the intake pipe 10. This section 35 of the edge strip 2 is rather, deflected at the sensor 15 by an acute angle α. The edge strip 2 thus exerts a force on the Sensor 15, which pivots this in direction 36.

By pivoting the sensor 15, the pivot arm 26 of the sensor 25 adjusted and thus the electrical Contact 28 closed. This causes via the signal path 29 an activation of the acoustic 30 and optical Warning device 31 and stopping the drive motor 32. It is also contemplated that the drive motor 32 at only to brake the active signal on signal path 29, so that the web 3 at a reduced speed continues. The operator can be in any Correct the incident that has occurred before causing damage the system arise.

LIST OF REFERENCE NUMBERS

1

contraption

2

edge strips

3

web

4

Web direction

5

hole

6

circular blade

6a

Wave of circular knife

7

direction of rotation

8th

cutting edge

9

suction

10

intake

10a

tube

11

Compressed air line

12

venturi

13

blowing direction

14

free end of the intake pipe

15

sensor

16

pivot bearing

17

swivel axis

19

Area of the feeler

21

distance

22

pipe

23

screw

24

Outside of the intake pipe

25

sensor

26

swivel arm

27

feather

28

electrical switch contact

29

pathway

30

acoustic warning device

31

optical warning device

32

drive motor

33

Area of the web

34

Pull direction of the edge strip

35

Section of the verge

36

Pivoting the probe

37

Intersection of the circular knife

α

Deflection angle of the edge strip

β

Angle of attack of the intake pipe

Claims (12)

Device for vacuuming an edge strip (2) separated from a running material web (3), in particular from a textile web, the device (1) having an intake pipe (10) into which the separated edge strip (2) can be drawn by means of a suction stream (9) characterized in that a sensor (15) mechanically sensing the edge strip (2) is provided on the intake pipe (10) and is supported by at least one spring (27) in a position projecting beyond the free end (14) of the intake pipe (10) is held, the mechanically sensing sensor (15) being adjustable by the edge strip (2) against the force of the spring (27), and the mechanically sensing sensor (15) being in operative connection with a sensor (25) detecting its adjustment. Apparatus according to claim 1, characterized in that the mechanically sensing sensor (15) is pivotally held on the suction pipe (10). Apparatus according to claim 2, characterized in that the mechanically sensing sensor (15) can be pivoted about a pivot axis (17) oriented approximately parallel to the plane of the web and approximately perpendicular to the direction of web travel (4). Apparatus according to claim 1, characterized in that the mechanically sensing sensor (15) is slidably held on the suction pipe (10). Device according to at least one of claims 1 to 4, characterized in that the mechanically sensing sensor (15) overlaps at least the side of the suction pipe (10) facing the fabric web (3). Device according to at least one of claims 1 to 5, characterized in that the mechanically sensing sensor (15) is held on the outside of the suction pipe (10). Device according to at least one of claims 1 to 6, characterized in that the sensor (25) converts the adjustment of the mechanically sensing sensor (15) into an electrical signal. Device according to claim 7, characterized in that the sensor (25) is an electrical switch or an inductive or capacitive proximity sensor. Device according to at least one of claims 1 to 8, characterized in that the sensor (25) is operatively connected to at least one warning device (30, 31). Device according to at least one of claims 1 to 9, characterized in that the sensor (25) is in operative connection with drives (32) of the web (3). Device according to at least one of claims 1 to 10, characterized in that the sensor (25) contains the spring (27). Device according to at least one of claims 1 to 11, characterized in that the suction pipe (10) opens into a nozzle (12) which can be pressurized with compressed air and which generates the suction flow (9).

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