EP1344616B1 - 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 sucking a from a moving 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 Webs these on both edge regions on needle chains pimped and stretched with these across the web direction becomes. Through these needle chains arise in the Edge areas of the web a variety of holes, so that this area of the web are no longer used can. It is therefore necessary to remove the margins of to separate the web. This is generally a rotating circular knife used, the axis of rotation transverse is aligned to the web running direction. The severed Edge strip is then by means of a Suction drawn into an intake pipe, which is the knife - Seen in the web running direction - is subordinate. These known device has proven itself well in practice. However, it has been found that in rare cases the knife does not completely cover the edge strip from the rest Web separates. In this case, the already in the intake pipe located part of the edge strip again pulled out of this. In particular, it can happen that this pulled out edge strip the needle chain caught and this or their deflection can damage.

From DE 198 60 425 C1 is a device for separating of cover and filling materials in a packaging known by quilts. This device has an intake pipe for an edge strip, in which a arranged as a light barrier sensor array arranged is. This sensor line indicates whether there is a border strip in the pipe was pulled in.

From US-3,731,570 is a device for suction and removing a cut edge of a strip of material known , where the tension of the cropped edge is monitored by a sensor integrated in a pulley.

Finally, from DE 82 07 236 U1 a device for sucking off the edge strips cut from material webs, in particular by slitting and creasing machines cut edge strip of a corrugated cardboard sheet known. This device has a pivotable Intake pipe, which has a square cross-section has.

The invention is based on the object, a device to create the type mentioned, with the Incidents are reliably detectable.

This object is achieved according to the invention with the features of Patent claim 1 solved.

The device according to claim 1 is used for aspirating a from a moving web, in particular a textile web separated edge strip. A separation of the marginal strip could be required, for example, if this damaged by a pin chain or by one upstream process was frayed. To separate the Edge strip from the rest of the web is preferably a knife used, which in particular as a rotating Circular knife is formed. To achieve an optimal Cutting action is the axis of rotation of this circular knife parallel to the fabric web plane and perpendicular to the web running direction aligned. So that the separated edge strip the transport and further processing of the web does not bother, this is done by means of a suction nozzle pulled into an intake pipe. This intake pipe is - seen in the direction of web travel - the intersection of the knife downstream. Preferably, it is at the intersection aligned so that the severed Edge strips with only a small deflection and thus especially is easily pulled into the intake pipe. Usually opens the intake pipe via a hose in an air-permeable Waste bin, that of the web separated edge strip for disposal receives. Of the Edge strip of the web can not in places complete separation by the knife again from the Suction tube are pulled out. Because this pulled out Edge strip can lead to damage to the system, It is important to be able to recognize this incident. To This purpose is a mechanically groping on the intake manifold Sensor provided which can detect this incident. This mechanically groping feeler will be of at least one Spring held in a position in which he over the free end of the intake pipe protrudes. The mechanically groping Sensor is also adjustable, where he is correct to the intake pipe tapered edge strip of this is not touched. With proper operation of the device accordingly remains the mechanically groping sensor in its projecting beyond the free end of the intake pipe Location. If, however, the edge strip of the web by the mechanically probing sensor to a predetermined Minimum angle deflected, so this applies to the mechanical groping feelers a corresponding force, the this adjusted against the force of the spring. Such Deflection of the edge strip of the material web at the mechanical groping feeler comes especially in those Cases in which the marginal strip is not complete was separated from the rest of the web or in which the edge strip has caught on the needle chain. Around register the adjustment of the mechanically probing probe to be able to do this with a corresponding Sensor in operative connection. This sensor generates a signal which the extraction of the edge strip from the Indicates intake pipe. This signal can vary widely Way to increase the operational safety of Device are used.

To achieve a high sensitivity of the mechanical groping probe, it is favorable if this possible low friction is held on the intake manifold. This is easiest according to claim 2 achieved in that the mechanical probing probes pivotally held on the intake manifold is. A pivot bearing can be built with little Effort very easy to realize low friction, so that the device creates a particularly compact overall can be.

In a preferred embodiment of the device according to Claim 3 is the mechanically probing probe around a in approximately parallel to the fabric level and approximately vertical pivoted to the web direction pivot axis. Preferably, the pivot axis is located in a region of the intake pipe facing away from the web. In this way, results in that of the web facing Range of mechanically probing probe one maximum responsiveness, so that this total works very sensitively.

Alternatively, it is advantageous according to claim 4, when the mechanically probing probes slidably held on the intake manifold is. In this case, although for the mechanical groping sensor created a separate sliding guide be, but this has the advantage that the mechanical groping feelers regardless of the direction in which the Edge strip is pulled over this, a constant responsiveness having. In particular, the responsiveness is of the mechanically groping probe regardless of its installation position.

As a rule, the separated edge strip is in the web running direction pulled along the web edge. To ensure, that the mechanically groping feeler the Edge strips regardless of its position transverse to the web running direction detected, it is advantageous according to claim 5, if the mechanically groping feeler at least that of the goods web facing side of the intake pipe overlaps. At The other sides of the intake pipe, this can also be overlapped by the mechanically groping feeler to However, this is not necessarily the case necessary.

To the suction flow within the intake pipe in no Way to hinder, it is favorable according to claim 6, when the mechanically groping sensor on the outside of the intake pipe is held. This can be ensured that no Parts of the mechanical feeler or its Storage in the intake and thus the air flow unfavorable influence.

To that generated by the sensor, the adjustment of the mechanical groping sensor corresponding signal easily it is advantageous according to claim 7, if the sensor is the adjustment of the mechanical probing sensor into an electrical signal.

Preferred embodiments of the sensor will become apparent from the claim 8. In particular, it is thought to use the sensor in Form of an electric switch to realize, especially the sensor only provides a pure yes-no decision got to. Thus, it is not necessary, the adjustment or Adjustment angle of the mechanically probing sensor as a proportional value to capture so that an electrical switch as a sensor is completely sufficient. This can be the device is particularly simple and robust at the same time build up, so that it is overall less susceptible to interference. Alternatively, the sensor could also be considered inductive or capacitive Proximity sensor be formed, which is characterized by the absence of any moving parts. This is particularly advantageous in areas where the air is heavily contaminated by dust or flakes of the web is. A proximity sensor is opposite such Pollution relatively insensitive.

In general, it is not desirable the entire production line a web when a disposable Disconnect accident. In particular, would this will lead to an unacceptably high level of the fabric in this case too long in bathrooms with partially aggressive chemicals lie in 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. Especially is thought that the warning device a emits acoustic and / or optical signal. This warning device warns the operator so that this appropriate countermeasures can take. For example could the pulling out of the intake pipe Part of the edge strip of the web simply cut off so that this again through the suction flow in the intake pipe is sucked in.

Alternatively or additionally, it is provided according to claim 10, to connect the sensor with drives of the web. In particular, it is thought, the web speed to slow down when an accident occurs, so that the operator has more time accordingly, to fix the error. It is also slowed down by a slowdown the web-run also the cutting of the not complete separated edge strip from the web easier. Alternatively, the sensor could also be a shutdown cause the drives of the web, but what to a correspondingly large committee in the production leads.

To make the structure of the device particularly simple, it is favorable according to claim 11, when the sensor contains the spring. In particular, if an electric Switch is used as a sensor is a corresponding one Spring already installed in these, so this advantageously also used for biasing the probe can be.

Finally, it is advantageous according to claim 12, when the intake pipe into a pressurizable nozzle empties. This nozzle easily generates the required Suction flow, which is used for sucking the separated Marginal strip provides. Preferably, the nozzle is as Venturi nozzle designed to be as efficient as possible To achieve suction. Is the free end of the Intake manifold sufficiently close to the knife, that's enough In this way, generated suction flow to that of the knife Separate separated edge strip of the web automatically. Here is a threading of the edge strip in the intake manifold is not required.

The subject invention is exemplified by the Drawing explained without limiting the scope.

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:

FIG. 1

a spatial representation of a device for sucking a separated from a moving web edge strip with proper function and

FIG. 2

the apparatus of Figure 1 when an accident occurs.

FIG. 1 shows a device 1 for aspirating a Edge strip 2, which is separated from a moving web 3 has been. The web 3 is thereby not shown Rolls transported in web direction 4. In a previous processing step of the web 3 this was on both edge strips 2 on each needle chain pimped to this across the web direction 4 to stretch. Through these needle chains are in the edge strips 2 of the web 3 holes 5 emerged, so that the edge strip 2 of the web 3 is no longer used can be. It is therefore necessary to have these edge strips 2 separate from the rest of the web 3.

For this purpose, a circular blade 6 is provided which of a Motor not shown driven in the direction of rotation 7 is. This circular blade 6 dives with a cutting edge 8 in the web 3 and separates in this way the Edge strip 2 of the remaining web 3. A shaft 6a of the circular blade 6 is perpendicular to the web running direction 4th and aligned parallel to the plane of the web 3. One another circular blade is provided on the web bottom, which is aligned with the circular blade 6 overlapping is to ensure a high cut safety.

To prevent the separated edge strip 2 the further transport of the web 3 disturbs, this is by means of the device 1 of a suction flow 9 in a Inlet pipe 10 pulled. At this intake pipe 10 is the output side a hose 10 a connected, which in a 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 12. Via this compressed air line 11 is Compressed air in direction 13 injected into the venturi 12. The effect of the venturi 12 is the air entrained in the tube 10 a, so that in the intake pipe 10 of the Suction 9 is formed.

To ensure that the separated edge strip 2 is properly fed into the intake pipe 10, this is aligned at an acute angle β to the web running direction 4. Viewed in a projection perpendicular to the plane of the web 3, The intake pipe 10 is aligned with the web running direction 4. Alternatively, the intake pipe 10 could also be aligned perpendicular to the web running direction 4. Furthermore is the free end 14 of the intake pipe 10th near the intersection 37 of the circular blade 6, so that too when pulling in a new web 3 the beginning of Edge strip 2 easily pulled into the intake pipe 10 becomes. By this orientation of the intake pipe 10 for Intersection point 37 of the circular blade 6 is particularly ensured that the separated edge strip 2 of the web 3 between the circular blade 6 and the free end 14 of the intake pipe 10 is deflected only slightly.

If the separated edge strip 2 at an underlying Needle chain caught or the circular knife 6 is 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. That's why it's important to recognize to be able to determine whether the separated edge strip 2 correctly on the intake pipe 10 tapers.

For this purpose, the intake pipe 10 is a mechanically grooving Sensor 15 is provided, which has a pivot bearing 16 is held pivotable 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 located in one of the web 3 facing away region 18 of the intake pipe 10. On this It is ensured that the sensor 15 in one area 19 near the web 3 a relatively large adjustment experiences. This is important because in this area 19 of the sensor 15 a not properly to the intake manifold 10 tapered edge strip 2 attacks. For this Reason the sensor 15 engages over the intake pipe 10 in the web 3 associated area 19 completely. Furthermore is the sensor 15 in this area 19 to a Distance 21 via the free end 14 of the intake pipe 10th above.

To prevent the intake of the intake pipe 10 by the attachment of the pivot bearing 16th the sensor 15 is changed, this is not directly on the intake manifold 10 but attached to a separate tube 22. This tube 22 engages over the intake pipe 10 and ends flush with this end. For fixing of the tube 22, screws 23 are provided which are threaded into holes engage the tube 22. These screws 23 Press blunt against an outside 24 of the intake manifold 10, so that the screws 23, the intake of the Inlet pipe 10 can 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 optimum responsiveness usually at the bottom of the intake pipe 22 may be provided. In Figure 1 he is only purpose a better visibility laterally on the tube 22 shown. The sensor 25 has a pivot arm 26 which is loaded by a spring 27 against the probe 15. These Spring 27 thus presses the sensor 15 in the in Figure 1 shown location. The sensor 25 has an electrical Switching contact 28, the adjusting movement of the sensor 15 converted into an electrical signal.

The output from the electrical switching contact 28 electrical Signal is sent via a signal path 29, an acoustic 30 and an optical warning device 31 is supplied. About these warning devices 30, 31 is the operator informed about a fault. additionally is connected to the signal path 29, a motor 32, 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 a. In In this case, the two warning devices 30, 31 are inactive and the motor 32 is driven for rotation.

Deviating from the embodiment of Figure 1 could the sensor 25 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 influenced in any way. In this Case, the operator must timely report the incident to prevent damage to the system. It is also conceivable, the sensor 25 only with the drive motor 32 to connect, so that the operator by the suddenly decelerated or stationary web 3 is made aware of the accident.

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

FIG. 2 shows the illustration according to FIG. 1 during occurrence an accident, wherein like reference numerals are the same Name parts. In a region 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 moving web 3 is taken. The edge strip 2 is therefore in the direction 34 pulled out of the intake pipe 10 again and may be, for example, at an underlying Pinch the needle chain and damage it or its deflection.

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

By the pivoting of the sensor 15 of the swivel arm 26 of the sensor 25 adjusted and thus the electrical Contact 28 closed. This works via the signal path 29 an activation of the acoustic 30 and optical Warning device 31 and stopping the drive motor 32. In addition, it is thought the drive motor 32 at decelerate the active signal on the signal path 29, so that the web 3 at a reduced speed continues. The wait staff can be in each In the event of a fault, rectify the damage before it starts the plant 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 sensor

21

distance

22

pipe

23

screw

24

Outside of the intake pipe

25

sensor

26

swivel arm

27

feather

28

electrical switching contact

29

pathway

30

acoustic
warning device

31

optical
warning device

32

drive motor

33

Area of the web

34

Drawing direction of the
edge strip

35

Section of the marginal strip

36

Pivoting the
probe

37

Intersection of the
circular knife

α

Deflection angle of
edge strip

β

Angle of attack of
intake pipe

Claims (12)

1. Apparatus for removing by suction trim (2) severed from a moving web (3), in particular a textile web, the apparatus (1) having a suction pipe (10), into which the severed trim (2) can be pulled by means of a suction flow (9), characterized in that on the suction pipe (10) there is provided a feeler (15) which senses the trim (2) mechanically and is held by at least one spring (27) in a position projecting beyond the free end (14) of the suction pipe (10), it being possible for the mechanically sensing feeler (15) to be displaced by the trim (2) counter to the force of the spring (27), and the mechanically sensing feeler (15) being operatively connected to a sensor (25) that registers its displacement.
2. Apparatus according to Claim 1, characterized in that the mechanically sensing feeler (15) is held on the suction pipe (10) such that it can be pivoted.
3. Apparatus according to Claim 2, characterized in that the mechanically sensing feeler (15) can be pivoted about a pivot axis (17) which is aligned approximately parallel to the plane of the web and approximately perpendicular to the running direction (4) of the web.
4. Apparatus according to Claim 1, characterized in that the mechanically sensing feeler (15) is held on the suction pipe (10) such that it can be displaced.
5. Apparatus according to at least one of Claims 1 to 4, characterized in that the mechanically sensing feeler (15) reaches beyond at least that side of the suction pipe (10) which faces the web (3).
6. Apparatus according to at least one of Claims 1 to 5, characterized in that the mechanically sensing feeler (15) is held on the outside of the suction pipe (10).
7. Apparatus according to at least one of Claims 1 to 6, characterized in that the sensor (25) converts the displacement of the mechanically sensing feeler (15) into an electrical signal.
8. Apparatus according to Claim 7, characterized in that the sensor (25) is an electric switch or an inductive or capacitive proximity sensor.
9. Apparatus according to at least one of Claims 1 to the 8, characterized in that the sensor (25) is operatively connected to at least one warning apparatus (30, 31).
10. Apparatus according to at least one of Claims 1 to 9, characterized in that the sensor (25) is operatively connected to drives (32) of the web (3).
11. Apparatus according to at least one of Claims 1 to 10, characterized in that the sensor (25) contains the spring (27).
12. Apparatus according to at least one of Claims 1 to 11, characterized in that the suction pipe (10) opens into a jet (12) to which compressed air can be applied and which generates the suction flow (9).

Images