JPH0560479U - Vertical autosurger - Google Patents

Abstract

(57) [Summary] [Purpose] The vertical autosurger of this machine is used for overedging of long materials, especially when slacks, skirts and other materials are sewn continuously on three or four sides. It facilitates work, improves material operation, greatly reduces the installation space, and improves the maintainability of the sewing machine head. [Structure] In an autosurger equipped with a feed direction adjusting mechanism, a transmission mechanism, and a rotation converting mechanism, the flat area of the table is made smaller than the material, and the corners of the table 15, 15a ... As well as
In side view, the wall surface has a tapered downward spread shape, and by equipping it with an air feeding device, the rotation of the material becomes smooth when sewing four sides of a long material, and the table has a sewing machine. By making the slide head retractable relative to the head, the sewing machine head is maintained without moving it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vertical autosurger that facilitates handling of surging material and facilitates material operation.

[0002]

[Prior Art]

 Conventionally, there are a manual type and an automatic type as surging machines (surgers a) that perform overedging of the material w. In the illustrated sager a, a corner of a wide work table b on which the material w is placed (in the left rear part in the drawing). ) In which a sewing machine head c is installed, and the work table b has a wide rectangular area that is long in the lateral direction so that long materials w such as slacks and skirts can be placed. Therefore, there is a drawback that a space for installing the surger a is required.

However, even if the large work table b is long in the lateral direction, its depth is large in the front-rear direction in order to allow the worker to manually press, move and hold the material w near the sewing machine head c (needle position). As a result, in the case of a long material w such as a slacks or a skirt, the g point hanging from the side surface d of the work table b as shown by the alternate long and short dash line in FIG. When the h state is hung from the front surface e of the work table b as shown by the chain line, the end of the material w protrudes from the work table b and hangs down, and the side surface d of the work table b and the corner of the front surface e. Since f is a right angle, the entire material w, especially the lower end, cannot be smoothly followed only by manually moving the material w on the work table b at the corner f (see FIG. 18). (Solid line state), or when the state is changed from the above-mentioned h state to the placement state on the work table b as shown by the one-dot chain line in FIG. 20, it is not easy to lift the lower end of the material w and the work table is not lifted. When placed on b, it had wrinkles or overlaps (solid line in FIG. 20) to handle the material w, which had the drawback of poor operability.

With respect to the maintenance of the surger a, especially the sewing machine head c, since the sewing machine head c is installed on the wide work table b, maintenance of the sewing machine head c, for example, thread breakage, thread change, When cleaning, the sewing machine head c has to be raised or retracted, and the sewing machine head c, which is a precision component, is moved, so that the sewing machine head c is liable to malfunction or malfunction.

[0005]

[Problems to be solved by the device]

 The present invention facilitates the manipulating work when performing overedging of a long material, etc., particularly when slacks, skirts, etc. are continuously sewn on three or four sides, and the material operation is improved and installed. The purpose of the present invention is to provide a vertical type autosurger with a significantly reduced space and improved maintenance of the sewing machine head.

[0006]

[Means for Solving the Problems]

 The present invention, which is based on the above-mentioned conventional technology, causes a problem that it is difficult to handle the material because the work table is wide and the corners are right angles, a problem that a vast installation space is required, and a trouble in the machine head. In consideration of the danger, the flat area of the table is made smaller than that of the material, the corners of the table are made into gentle R portions in plan view, and the wall surface is made into a tapered downward widening shape in side view. The sewing machine head is not moved by making the rotation of the material smooth when sewing 3 or 4 sides of a long material and by making the table slide and retract with respect to the sewing machine head. The above problem was solved by enabling maintenance of the sewing machine head.

Further, when handling the above-mentioned material, air is blown out from above and below the table, etc., so that the material protruding from the top surface of the top plate and the material bent by contact at the table lower surface are brought out by air to the outside. The object is to solve the above problems by reducing the weight and the contact resistance.

[0008]

According to the present invention, when sewing three or four sides of the material, the edge of the material hangs down on the front, side, and back positions of the table, and the taper wall reduces the weight of the material. When the material is rotated, the lower end of the material smoothly interlocks with the rotation of the base end when the material is rotated, and the material bends at an obtuse angle at the lower end of the wall surface and smoothly moves along the wall surface. In addition, the rounded corners of the table allow the material to bend and smoothly rotate in combination with the above action.

[0009] Furthermore, when the above-mentioned material is rotated and moved, the material is maintained in a flat state in a vertical plane without being twisted or overlapped by the weight of the material lower end, and in accordance with the action, the material on the table and the wall surface is If a flat surface is secured and the table is slid and retracted, a working space appears between the machine head and the table, and the bobbin thread on the machine head is replaced and cleaned.

In addition, in the above-mentioned equipment for assisting the rotational movement of the material, when the material is originally handled, the material bends on the top surface of the top plate, contacts the wall surface, and bends on the bottom surface of the table. However, the weight of the material and the contact resistance are reduced by ejecting air from various nozzles to bring the material out to the top plate and the table.

[0011]

【Example】

 An embodiment of the present invention will now be described with reference to the drawings. 1 is a vertical automatic type surger with good workability, and a lower frame 3 having legs (casters) 2, 2a ... A main box 4 is installed on one side of the upper part, a motor 5 is installed inside the main box 4, and a table 6 having a small area in plan view smaller than the specially shaped material W is slidable on the upper part of the main box 4. In addition, the sewing machine head 7 connected to the motor 5 and the controller 8 are fixedly installed on the upper part of the main box 4 on one side of the table 6.

Reference numerals 9 and 9a denote guide rails horizontally installed on the upper part of the main box 4, and slide bases 10 and 10a are mounted on the guide rails 9 and 9a so as to be slidable in the left and right directions. A table 6 is installed on the sewing machine so that the table 6 can be slid and retracted with respect to the sewing machine head 7, and a working space 11 can be exposed between the table 6 and the side surface of the sewing machine head 7. There is.

The above-mentioned shape of the small table 6 is such that the straight portions of the front surface 12, the side surface 13 and the rear surface 14 and the corners 15, 15a ... Are formed in a gentle R portion in a plan view, and the top surface in a side view. 16 has a wide lower surface 17 and four wall surfaces 18 have a taper-like downward spread shape, and a top plate 20 having the same shape as the table 6 with a gap 19 at a predetermined interval above the table 6. Has been installed.

Next, the mechanism and equipment for automating the feeding, rotation and handling of the material W will be explained. Numeral 21 is a cloth retainer which can be attached to and detached from the table 6 installed on the sewing machine head 7. A needle hole 23 corresponding to the sewing machine needle 22 is provided at an appropriate position of the sewing machine 21, and a feed device 24 for the material W including a predetermined feed dog mechanism is provided at a predetermined position of the table 6, and a sewing position 25 is provided. A guide member 26 for guiding the material W is arranged in front of the (needle hole 23).

A feed direction adjusting mechanism 27 is provided with a feed roller 28 which is rotatable in the forward and reverse directions with respect to the feed direction at a lateral eccentric position of the sewing position 25, and the feed roller 28 is arranged above the sewing machine head 7. An arm 31 pivotally supported at one end on a supporting rod 30 projecting laterally from a fixed base 29 is rotatably attached to the other end through a pin 32, and the arm 31 has a supporting rod 30. A cylinder 33 eccentrically attached to the base is connected via an operating rod 34, and the arm 31 is vertically swung by the operation of the cylinder 33 so that the feed roller 28 at the tip of the arm 31 is placed on the table 6. It is configured to control the attachment / detachment.

Further, the feed roller 28 is configured to be controlled to rotate forward and backward at a predetermined speed by the operation of the motor 35 via a series of transmission mechanism 37 including a pulley and a belt 36 with respect to the motor 35.

Reference numeral 38 denotes a rotation converting mechanism, which pivotally supports an arm 40 horizontally on the base 29 so that the arm 40 can swing horizontally with the upper facing position of the sewing position 25 as a fulcrum 39. While the dar 41 is hung vertically, a pressing plate 42 made of a non-slip member such as rubber is attached to the rod at the lower end of the cylinder 41 so as to be attachable to and detachable from the material W on the table 6 by the action of the cylinder 41. The lower end of the arm 40 extends from the fulcrum 39, and is pivotally attached to the rod of a cylinder 43 mounted horizontally on the base 29 via a connecting rod 44, and the arm 43 is controlled to swing by a predetermined angle by the forward / backward movement of the cylinder 43. It is made to do.

Reference numeral 45 is a detection unit that detects the shape of the material W and controls the feeding direction, speed, etc. of the material W, and the advancing trajectory of the edge of the material W fed to the sewing position 25 along the guide member 26. Above the table 6, a pair of guide sensors 46 and 46a for detecting left and right displacement of the edge portion with respect to the feed direction are supported above the table 6 at both positions with respect to the feed direction through the support member 47, and the edge portion Immediately before the sewing position 25 at the position inward of the traveling track, a stop sensor 48 for detecting the passage of the corner portion of the material W is mounted on the base 29, and is supported at a predetermined distance in front of the stop sensor 48. Similarly, a speed control sensor 49 for detecting the passage of the corner of the material W is mounted on the member 47, and the optical detection function of the detection unit 45 causes the feeding device 24, the feed direction adjusting mechanism 27, and the rotation converting mechanism 38. Each machine Forms so as to electrically respectively control.

In addition, as described above, in the equipment for smoothly rotating and feeding the material W by the feeding device 24, the feeding direction adjusting mechanism 27, and the rotation converting mechanism 38, the top plate 20 is provided. Surfaces, the gap 19 between the top plate 20 and the table 6, the lower surface of the table 6, the feeding device 24, etc. are equipped with air feeding devices 50, 50a, respectively. The air feeding devices 50, 50a. explain.

There are two types of the air feeding devices 50, 50a, which are a slacks specification (trousers specification) and a skirt specification. First, the slacks specification will be described. The top surface of the top plate 20 (material W On the main mounting side B), one nozzle 51 is installed in the rear 14 direction (X direction of movement of the material W), and it extends from the end position of the front surface 12 in the gap 19 to the side surface 13 position, that is, the front surface 12 The corners 15 and 15a at the terminal end are equipped with three nozzles 52, 53 and 54, which are located at the positions directly in front and on the side surface 13, respectively, and the directions thereof are intermediate between the back surface 14 direction and the side surface 13 direction (of the material W). It is the intermediate direction of the traveling direction X and the evacuation direction Y that takes out the material W to the outside), and is the intermediate direction between the backward advancing direction Z of the material W and the evacuation direction Y1 at the starting end position of the front surface 12 in the gap 19. One piece is placed on the non-main side C of the material W in It is equipped with the SURU 55.

Further, one nozzle 56 is provided on the lower surface of the table 6 for feeding air of the material W toward the rear surface 14 at the side surface 13 position (traveling direction X), and at the front surface 12 position to the side surface 13 direction (retraction). One nozzle 57 is provided in the direction Y), and one nozzle 58 is provided in the substantially same direction as the above-described nozzle 55 at the front 12 position.

When the material W is sewn by the above-mentioned many nozzles 51, 52, 53, 54, 55, 56, 57, 58, air is jetted to supplement the sewing, that is, the nozzles 51, 54, 56 can move in the straight direction. The feed of the material W is supplemented at the time of sewing, the nozzles 52, 53 and 57 are activated at the time of sewing the hem and the crease, and the nozzles 55 and 58 are prevented from bending and sewing, and their respective functions are the top plate 20. The material W is bent on the upper surface of the table 6 and the lower surface of the table 6 to reduce the point where the weight of the material W is applied to the material located in the upper part, and the contact resistance on the wall 18 of the table 6 is reduced. Reduce.

In addition, for extended air in the slacks specification, a nozzle 59 is provided in a diagonally rearward direction (a direction intermediate between the retracting direction Y and the reverse traveling direction Z) on the upper surface of the top plate 20 in the direction of the side surface 13 and the cloth presser Nozzle 60 is installed on the side 13 direction (retracting direction Y) at 21. The nozzles 59 and 60 extend the material W by air after the corner stop of the material W and before the rotation operation to ensure the rotation of the material W. To

Further, for rotating air in the slacks specification, nozzles 61 are provided at the corners 15, 15a of the front surface 12 and the side surface 13 in an intermediate direction between the retracting direction Y1 and the reverse traveling direction Z, and when the material W rotates. Make up for rotation.

Next, in the skirt specification, one nozzle is provided on the upper surface of the top plate 20 (the main mounting side B of the material W) on the upper surface of the top plate 20 for feeding air of the material W in the back 14 directions (the traveling direction X of the material W). It is equipped with a nozzle 62, and is equipped with one nozzle 63 whose corners 15 and 15a at the end of the front surface 12 in the gap 19 are changed in an immediately preceding position. A direction between the direction X and the retreat direction Y), and a cloth presser 21 on the top surface of the top plate 20 is equipped with one nozzle 64 in the traveling direction X.

Further, for the feed air of the material W on the lower surface of the table 6, one nozzle 65 is provided at the starting end position of the front surface 12 in the intermediate direction between the retracting direction Y and the reverse traveling direction Z, and at the front 12 position. Equipped with one nozzle 66 in the shelter direction Y, equipped with one nozzle 67 in the intermediate direction between the shelter direction Y and the reverse traveling direction Z at the corners 15 and 15a of the front face 12 and the side face 13, and the side face 13 Two nozzles 68 and 69 are provided in the intermediate position between the traveling direction X and the retracting direction Y at the position.

For extending air in the skirt specification, a nozzle 70 is provided on the top surface (main mounting side B) of the top plate 20 in the side 13 direction (retracting direction Y), and the cloth presser 21 is used for the side 13 direction (side). The nozzle 71 is equipped in the retracting direction Y).

Further, as the air feeding devices 50, 50a ... Which are common to the slacks specification and the skirt specification, the air feeding device 50, 50a, ... A nozzle 72 is provided on the non-main side so that the material W is put under the guide member 26 and the cloth edge of the material W curled by the nozzle 72 is extended to facilitate insertion under the cloth presser 21.

Next, the operation of the vertical autosurger according to the present invention will be described. For example, a long material W such as a slacks or a skirt has three or four sides, or a front body part A, an incurve, and an outcurve. In the case of sewing 5 or 6 sides, and also a mixture of straight lines and curves, from the start of sewing as shown in FIG. 6, the material is fed by the action of the feeding device 24 and the air feeding devices 50, 50a. One side of W is sewn, the end of one side is detected by the speed control sensor 49 and the stop sensor 48, sewing is completed after a predetermined time, and the feeding of the material W by the feeding device 24 is temporarily stopped. The front end of the material W is suspended from the back surface 14 of the table 6 as shown in FIG.

Then, with the sewing needle 22 holding one point of the material W, the material W on the table 6 is rotated by the action of the rotation conversion mechanism 38 and the air feeding devices 50, 50a ... As shown in FIG. The material W hangs down from the side surface 13 like this, and the sewing is continued. Then, after the short side of the material W is sewn, the material W is rotated and the hanging portion of the material W is changed from the side surface 13 to the front surface 12. Move and sequentially sew four sides.

As described above, when the material W is sequentially rotated and moved, the flat end portions of the table 6 and the top plate 20, that is, the end portions of the material W hang down at the positions of the front surface 12, the side surface 13, and the rear surface 14, thereby forming a taper shape. When a part of the weight of the material W is supported by the wall surface 18 and the base end of the material W on the table 6 is rotated during the rotation operation of the material W, the weight of the lower end of the material W is interlocked with the rotation. It decreases and smoothly interlocks, and because the material W is bent at an obtuse angle at the lower end of the wall 18, it moves smoothly along the wall 18 even at corners 15 and 15a…, and also at the corner 15 of the table 6. .., 15a, ... Due to the gentle R portion, the material W bends in an R state corresponding to the corners 15, 15a, ...

Further, when the material W is rotationally moved as described above, the weight of the lower end of the material W and the action of the air feeding devices 50, 50a ... Keep the material W in a vertical plane without being twisted or overlapped. , The flatness of the material W in the width direction acts on the upper portion of the material W to ensure the flat state of the material W on the table 6 and the wall surface 18, and when the table 6 is slid and retracted, the sewing machine head 7 and A working space 11 appears between the tables 6 and the bobbin thread on the sewing machine head 7 is replaced and cleaned.

Explaining the sewing of the material W as an autosurger, the material W to be edged is placed on the top plate 20 of the table 6 and its processing starting point is set at the sewing position 25. When the sewing machine head 7 is actuated so that the edge portion is guided by the guide member 26, the material W is sequentially fed to the sewing position 25 by the action of the feeding device 24, and a predetermined overedging process is performed.

In the process in which the curved portion of the edge of the material W is fed to the sewing position 25, the edge of the material W is fed when the edge passes the detection unit 45 before the sewing position 25. If it shifts to the left or right according to the curved shape with respect to the direction, the shift is detected by any of the internal sensors 46 and 46a, and the detection action causes the feed roller 28 of the feed direction adjusting mechanism 27 to move downward. The feed roller 28 is brought into contact with the material W on the plate 20. Here, the feed roller 28 is controlled to a low speed and a high speed rotation state in the stopped state and the forward / reverse rotation state respectively, and the feed speed of the feeding device 24 is eccentric from the sewing position 25. On the other hand, since the eccentric position of the material W is controlled to move forward and backward relative to the feeding direction, the material W is swung left and right around the sewing position 25, and by the action of the feed roller 28, Lest sensor detected displacement at 46,46a is corrected, with sequentially sent while matching the feed direction edges in sewing position 25, a predetermined processing treatment is performed.

Next, when the material W has a corner portion that bends at a substantially right angle, the corner portion can be controlled only by the operation of the feed direction adjusting mechanism 27 by the guide sensors 46 and 46a. Therefore, it is necessary to rotate the entire material W when the corner is fed to the sewing position 25.

Then, when the material W is sequentially processed and advances in the feeding direction to reach the corner portion to the detection portion 45, first, the speed control sensor 49 detects the passage of the corner portion due to the absence of the material W. , When the corner passes the position of the speed control sensor 49, it issues a signal command to speed down the feeder 24 for accurate stop from the normal high speed feed state to the low speed feed state. Material W is fed at a low speed from the time when it passes through.

The material W is switched to the low speed feed state by the command of the speed control sensor 49 to proceed in sequence, and then immediately before the sewing position 25, the stop sensor 48 detects the passage of the corner portion. , The distance between the stop sensor 48 and the sewing position 25 and the feed speed of the low-speed feed are detected, and after the corner sensor is detected by the stop sensor 48, a predetermined time is passed via the delay circuit. The feeding action of the feeding device 24 is stopped, and the corner portion is accurately stopped and held corresponding to the sewing position 25.

Then, when the feeding device 24 is stopped, the rotation converting mechanism 38 is operated next time, and the pressing plate 42 is lowered by the operation of the cylinder 43 to hold the material W on the top plate 20, and then the cylinder 41 is actuated and the pressing plate 42 moves through the arm 40 by a predetermined angle around the sewing position 25. Accordingly, the material W on the top plate 20 is rotated by a predetermined angle around the sewing position 25. Then, the edges for the next processing are arranged so as to match the feeding direction, and after the disposition change of the material W is finished, the feeding device 24 is again operated at a high speed and the material W is sequentially sewn at the sewing position 25. The material W is unloaded to a predetermined position when the predetermined processing is performed and the processing of all the sides to be processed is completed.

[0039]

[Effect of the device]

 In short, according to the present invention, the sewing machine head 7 is arranged on one side of the table 6, and the flat surface of the table 6 is arranged in the surger 1 provided with the feeding device 24 for the material W, the feeding direction adjusting mechanism 27, and the rotation converting mechanism 38. Since the area is made considerably smaller than the material W, the installation space for the vertical autosurger can be significantly reduced, and the shape of the table 6 is straight in the front 12, side 13 and back 14 in plan view. In addition, since the corners 15, 15a ... Are formed as gentle R portions, when the material W is rotated on the table 6, the material W that hangs off the table 6 following the material W on the table 6 is hung down. The edges of each of the corners 15a, 15a, etc. can be smoothly rotated to prevent wrinkles from coming into contact with the material W on the table 6, and the manipulating work is facilitated when continuously sewing three or four sides. The material can be operated well, and the wall surface 18 of the table 6 is formed in a downward tapered shape in a side view. Therefore, the wall surface 18 supports a part of the weight of the lower end of the material W protruding from the table 6. The rotational resistance of the material W is reduced and the bending of the material W at the lower end of the wall surface 18 is made an obtuse angle, so that the rotational resistance of the material W can be reduced. It is possible to keep W flat.

Further, since the table 6 is slidable and retractable with respect to the sewing machine head 7, the work space 11 appears between the table 6 and the sewing machine head 7, and the maintenance of the sewing machine head 7 is facilitated. In addition, since the sewing machine head 7 which is a precision component is fixed, it is possible to prevent the sewing machine head 7 from being damaged.

Further, the upper surface of the top plate 20, the gap 19 between the top plate 20 and the table 6, the lower surface of the table 6 and the like are provided with air feeding devices 50, 50a for feeding air, extending air, and rotating air. Therefore, by reducing the weight and contact resistance of the material W, the material W can be fed smoothly when it is fed during sewing, and the non-main side C of the material W can be prevented from overlapping. The overedging can be performed completely, and the material W can be smoothly rotated when the sewing of one side is completed.

Further, since the nozzle 72 of the air feeding device 50, 50a is provided for the air extending to the front position of the feeding device 24, even if the material end of the material W is curled at the start of sewing, the material W is nozzled. The material W can be easily extended by 72 and inserted into the feeder 24, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a front view of a vertical autosurger according to the present invention.

FIG. 2 is a plan view of the vertical autosurger shown in FIG.

3 is a side view of the vertical autosurger of FIG. 1. FIG.

FIG. 4 is a perspective view of the vertical autosurger of FIG.

FIG. 5 is a plan view of the vertical autosurger when the table is slid and retracted.

FIG. 6 is a schematic perspective view of the present invention in which a material is set and a part of the mechanism is omitted.

FIG. 7 is a schematic perspective view showing a state in which one side of the material in FIG. 6 is sewn, with a part of the mechanism omitted.

FIG. 8 is a schematic perspective view showing a state in which the material is rotationally moved following FIG. 7, with a part of the mechanism omitted.

FIG. 9 is a plan view of a table in which an air feeding device for feeding air is arranged on a top surface and a gap in a slacks specification.

FIG. 10 is a plan view of a table in which an air feeding device for feeding air is arranged on the lower surface of the table in the slacks specification.

FIG. 11 is a plan view of a table in which an air feeding device for air is arranged on the top surface of the top plate and the cloth retainer in the slacks specification.

FIG. 12 is a plan view of a table in which an air feeding device for rotating air is arranged on the lower surface of the table in the slacks specification.

FIG. 13 is a plan view of a table in which an air feeding device for feeding air is arranged on a top plate, a gap, and a cloth retainer in a skirt specification.

FIG. 14 is a plan view of a table in which an air feeding device for feeding air is arranged on the lower surface of the table in the skirt specification.

FIG. 15 is a plan view of a table in which an air feeding device for air that is extended to the top surface of the top plate and the cloth presser in the skirt specification is arranged.

FIG. 16 is an enlarged plan view of the vicinity of the needle position.

FIG. 17 is a schematic plan view showing a state in which a material is set in a conventional flat type surger.

FIG. 18 is a schematic perspective view showing a state in which one side of the material in FIG. 17 is sewn, and the material is being routed during the rotational movement.

FIG. 19 is a schematic perspective view showing the material handling state at the completion of the rotational movement of the material following FIG.

20] When one side of the material in FIG. 19 is sewn,
It is a schematic perspective view which shows the handling state of the raw material when the raw material is rotatably moved and placed on the table.

[Explanation of symbols]

 1 Surger 6 Table 7 Sewing machine head 12 Front face 13 Side face 14 Back face 15, 15a… Corner 18 Wall face 19 Gap 20 Top plate 24 Feeding device 27 Feeding direction adjusting mechanism 38 Rotation converting mechanism 50, 50a… Air feeding device 72 Nozzle

Claims (4)

[Scope of utility model registration request] 1. In a surger having a sewing machine head arranged on one side of a table and having a material feeding device, a feed direction adjusting mechanism and a rotation converting mechanism, the flat area of the table is formed to be considerably smaller than the material. However, the shape of the table is that the front surface, the side surface and the back surface are straight lines in plan view, each corner is a gentle R part, and the wall surface of the table is tapered downward widening shape in side view. Vertical autosurger. 2. The vertical autosurger according to claim 1, wherein the table is slidable and retractable with respect to the head of the sewing machine. 3. An air feeding device for feeding air, extending air, and rotating air is provided on the top surface of the top plate, the gap between the top plate and the table, the bottom surface of the table, and the like. Or 2 vertical autosurgers. 4. A vertical autosurger according to claim 1, 2 or 3, further comprising a nozzle of an air feeding device for extending air to a position in front of the feeding device.