HK1093538B - Ribbon needleloom - Google Patents

Description

Ribbon loom

Technical Field

The invention relates to a ribbon loom with a shed-forming heddle device.

Background

A ribbon loom of the type mentioned at the outset with shedding heddle devices is known in many cases. The heddle device has a heddle frame. The latter presents the following problems: in the case of ribbon looms with larger dimensions and/or higher rotational speeds they no longer have sufficient stability. The heddle rails (heddle rails) have a tendency to bend, no longer ensuring a sufficient force transmission between the heddle rails. This may lead to damage of the heald frame.

Disclosure of Invention

The object of the invention is to improve a ribbon loom of the type mentioned at the outset.

The set object is achieved by providing a ribbon weaving machine with a heddle device which forms a shed and has a heddle frame carrying a heddle, with a weft thread and with at least one thread feed device, with a knitting needle which is arranged on the side of the shed facing away from the weft thread, and with a reed, characterized in that the heddle frame has at least one heddle support with a hollow rod with an upper transverse lead-in for an upper heddle rail and a lower transverse lead-in for a lower heddle rail, the upright heddle rails being connected via a pressure lever arranged in the hollow rod and being tensioned to one another by means of tensioning screws arranged coaxially with respect to the pressure lever at the end of the hollow rod. Since the heald frame has at least one heddle support with a hollow rod with an upper transverse lead-in for the upper heddle flyrail and a lower transverse lead-in for the lower heddle flyrail, such a heddle support can then be attached at any desired point on the heald frame for reinforcement. The upright heddle runways are connected via a pressure rod arranged in the hollow rod and are tensioned to one another by means of tensioning screws arranged coaxially with respect to the pressure rod at the ends of the hollow rod. This provides a considerable strengthening of the heddle frame, so that the latter is suitable on the one hand for larger dimensions and/or on the other hand for higher rotational speeds. However, such a heddle support frame can also be used for the basic construction of a heddle frame, i.e. it can also be used on the sides for connecting upper and lower heddle rungs.

According to the webbing loom of the invention, the at least one lead-in opening can have a transversely vertically oriented support flange.

According to the ribbon loom of the invention, the hollow bars can have gaps on both sides opposite each other, distributed over their entire length and offset with respect to each other.

According to the webbing loom of the present invention, the hollow rod may be made of a slidable plastic reinforced by fibers.

According to the ribbon loom of the invention, the healds with thread guide openings can be pulled straight on the heald flyer by means of end openings, at least the driving heald flyer can have a thinner leg which can project transversely with respect to the heald flyer and can engage with a small play into a catch groove of the relevant end opening of the heald, the end opening provided to the driving heald flyer can completely surround the heald flyer, and a play of up to 0.01 to 0.3mm can be present between the leg of the driving heald flyer (62) and the catch groove of the end opening.

According to the webbing loom of the invention, the heald frames may be provided with pivoting levers which can be actuated by a cam at a drive point and can be connected to the heald frames at a driven point, and whose pivoting axes are at right angles to the plane in which the heald frames extend, the distance (a) of the drive point from the pivoting axes being different at least in the case of two pivoting levers, so that during operation the heald frames provided to these pivoting levers are displaced to different extents, and furthermore the distances of the pivoting axes at different distances (B) from the driven point are different from a midplane which is parallel to the direction in which the heald frames are displaced, at right angles to these planes in extension, and passes through the center of the heald frames.

According to the webbing loom of the invention, the heald frames can be moved in each case by means of an actively acting drive in one direction and by means of a spring return in the other direction.

According to the ribbon loom of the invention, the heald frames can be moved in each case in one direction by means of an actively acting drive and in the other direction by means of a pneumatic return device with a gas volume in a separate gas chamber which can be compressed at the operating frequency by the actively acting drive.

The webbing loom according to the invention has a main drive shaft which is positioned transversely with respect to the cloth web and to which a reed drive, a weft needle drive and a needle drive are connected, the weft needle drive and the reed drive in each case having a remote lever which can be connected via a coupling element to a crank pin of the main drive shaft which is offset by 180 °, so that the weft needle drive and the needle drive can be swivelled with respect to one another, and furthermore the heddle device can have a secondary drive shaft which is connected via a pair of wheels to the main drive shaft.

According to the webbing loom of the invention, the guide plate with the guide rail can be arranged on the side of the knitting needle facing away from the shed, so that the weft foot of the weft arc to be caught by the knitting needle during the insertion into the shed is located below or at most flush with the needle head of the knitting needle and can be inserted into the hook track of the needle head when the weft needle exits above the needle head.

According to the webbing loom of the invention, the weft needles can be provided with a thread feeding device, which can have a compensation device for the weft thread, which can be pneumatically operated and is designed as a blowing and/or suction device, and a separate thread eye for the weft thread can be arranged downstream of the compensation device and upstream of the weft needles in the running direction.

The webbing loom according to the invention can have a yarn transport device for the weft yarn, which can have a drivable transport roller arranged on a shaft with a varying peripheral speed and having a friction surface, which is formed by a one-piece shell that is radially expandable under the action of an actuating device, and a pressure roller that is pressed against the transport roller beforehand.

The webbing loom according to the invention has a thread transport device for weft threads, which has a rotating conveyor belt which transports the thread and is guided between two conical adjusting disks and a deflecting roller and a pressure roller, the axial distance between the two adjusting disks being variable on a drive shaft, there being an adjusting device which changes the distance of the deflecting roller from the drive shaft, the conveyor belt having transverse ribs at least on one side and being guided in a meandering manner around the deflecting roller and the pressure roller, and furthermore the thread to be transported being received and discharged in the region of the meandering-shaped guiding device.

According to the invention, the support (hold) of the heddle support rail can be improved if at least one lead-in opening has a transverse support flange pointing in the direction of the hollow shaft.

According to the invention, the hollow rods can be produced from solid material, which is more advantageous for the improvement, but according to the hollow rods, on the sides opposite each other, have gaps distributed along their entire length and offset with respect to each other, resulting in a significant reduction of the volume forced to move. According to the invention, the hollow rod is made of a slidable plastic reinforced by fibers, also contributing to the reduction of volume.

Further improvements and advantages of the ribbon loom are contained in the following detailed description of exemplary embodiments.

Drawings

An exemplary embodiment of a ribbon loom according to the invention is described in more detail below with reference to the accompanying drawings, in which:

fig. 1 shows a side view of a ribbon loom;

fig. 2 shows a heddle device with a pneumatic return device in a view transverse to the direction of travel of the cord;

figure 3 shows in detail a vertical section of a heddle frame with a heddle support;

figure 4 shows a top view of a rocker of a cam gear of a heddle device;

figure 5 shows in detail a heddle frame with a spring return device;

figure 6 shows a vertical section parallel to the cord line of a heddle frame with a heddle wire;

figure 7 shows a section vii-vii of the heddle frame of figure 6;

FIG. 8 shows a side view of a drive diagram of the inkle loom;

FIG. 9 shows a horizontal projection of the drive diagram of FIG. 8;

FIG. 10 shows a top view of the weaving zone of the ribbon loom;

FIG. 11 shows a section XI-XI of the weave section of FIG. 10;

fig. 12 shows a view of a yarn feeding device of a ribbon loom;

fig. 13 shows a section xiii-xiii of the yarn feeding device of fig. 12;

fig. 14 shows a side view of another yarn feeding device;

fig. 15 shows a section XV-XV of the yarn feeding device of fig. 14;

fig. 16 shows a side view of the first conveyor belt;

FIG. 17 shows a cross-section of the conveyor belt of FIG. 16;

FIG. 18 shows a side view of the second conveyor belt; and

fig. 19 shows a cross-section of the conveyor belt of fig. 18.

Detailed Description

Fig. 1 shows a ribbon loom with a machine support 2, in which a main drive shaft 4 (not shown in greater detail) driving at least one weft needle 6, a reed 7, a cloth winding device 8 and a heddle device 10 are mounted. The ribbon loom has a cable beam support 12 carrying a cable beam 14, from which cable beam 14 a cable 16 is fed to the heddle device 10, which heddle device 10 opens the cable into a shed 18. By means of the thread feeding device 20, a weft thread 24 is fed from a bobbin 22 to the weft needle 6, which weft needle 6 introduces an arc of weft thread into the shed 18. The successive weft yarn arcs can be knotted by themselves or by means of a tuck yarn 26 fed to the needles via a further yarn feeding device 28, which is not described in detail here, so that the inserted weft yarn arc is knotted and secured.

Fig. 2 to 4 show a first heddle device 10 in which the heddle frames 30, 30a are in each case connected by means of a connecting rod 32, on the one hand, positively (positivelly) to a cam gear 34 and, on the other hand, to an air return 36. The cam gear 34 has pivoting levers 38, 38a, 38b, 38c, 38d which cooperate at a drive point 40 with cams 42 of a camshaft 44. At the driven point 46, the pivoting levers 38, 38a, 38b, 38c, 38d are hinged to the connecting rod 32 via a joint 48. The pivot axis defined by the joint point 48 is at right angles to the plane in which the heddle frames 30, 30a extend. Between adjacent pivoting levers, the distance a of the pivoting levers 38, 38a, 38B, 38c, 38d of the drive points 40, 40a, 40B, 40c, 40d from the respective pivoting axes 50, 50a, 50B, 50c, 50d is different, while the distance B of the driven points 46, 46a, 46B, 46c, 46d from the pivoting axes 50, 50a, 50B, 50c, 50d is also different, so that the heddle frames can be displaced to different extents to form successively widened and again narrowed sheds, as can be gathered from fig. 1. The pneumatic return means 36 is formed by an air chamber 52 in which a piston 54 connected to the connecting rod 32 can be displaced so as to actively (positively) compress the piston at the operating frequency of the cam gear 34. A pressure relief valve 56 connected to the air chamber 52 limits the maximum pressure in the air chamber. Via a check valve 58 to a compressed gas source 60 to regulate the gas pressure in the gas chamber 52. The compressed gas source 60 is connected to a control device, not described in detail, whereby the gas pressure in the gas chamber can be set as a function of the operating state of the inkle loom.

Fig. 5 shows a heddle device 10a in which the pneumatic return means 36 are replaced by spring return means 61 acting on the frame 30, 30 a.

The heddle frames 30, 30a are formed by an upper heddle flyer 62 and a lower heddle flyer 64 which are connected to one another by a heddle support 66. The heddle support 66, which is shown in more detail in fig. 3, has a hollow rod 68 made of metal or preferably of fiber-reinforced plastic. The hollow rods 68 include gaps 70 on opposite sides distributed along their lengths and offset relative to each other. Upper heddle flyrail 62 is inserted in upper transverse lead-in 72 and lower heddle flyrail 64 is inserted in lower transverse lead-in 74. At least one of the lead-in holes 72, 74 has a laterally vertically positioned support flange 75. The upright heddle rails 62, 64 are interconnected by a strut 76. At the upper end of the hollow rod 68, a tensioning screw 78 is screwed into the hollow rod 68 and presses onto the upper heddle flyrail 62, thereby prestressing the heddle flyrails 62, 64 relative to each other to form a reliable connection between the upper and lower heddle flyrails 62, 64 via the heddle support 66. As can be seen from fig. 2, a plurality of heddle supports 66 is distributed over the entire length of the heddle frame. Between the upper and lower heddle rails 62, 64, a heddle 80 is provided which has thread guide openings 82 through which the cord threads 16 pass in each case.

Figures 6 and 7 show a preferred design of a heald frame 30, wherein the heddle 80 is straightened on the upper and lower heddle rails 62, 64 by means of an upper end aperture 84 and a lower end aperture 86. The driven heddle flyer rail 62 in this example has a thinner leg 88, which thinner leg 88 projects laterally with respect to the heddle flyer rail 62 and fits with little play into a catching groove (catching groove)90 of the associated end hole 84 of the heddle 80. The end hole 84 provided to the driving heddle flyer 62 completely surrounds the heddle flyer 62, there being a play between the leg 88 of the driving heddle flyer 62 and the catching groove 90 of the end hole 84, which play amounts to 0.01 to 0.3 mm. For this purpose, the thickness of the leg 88 and the width of the catch groove 90 are coordinated so that the play between the leg 88 and the catch groove 90 amounts to 0.01 to 0.3 mm. Although this play is small, the heddle can also preferably be of laminar design, spreading out at an angle α equal to 15 ° with respect to the vertical, as shown in fig. 7. Lower heddle flyer 64 may be configured similar to upper heddle flyer 62, and may be 0.5 to 10mm of vertical play. In this example, the lower heddle flyer 64 is not used for the drive heddle 80, but rather for guidance in the heddle frame and for absorbing the transverse forces caused by the cord 16 being forced into motion. Due to this construction of the heddle, the heddle device causes only little noise and minimizes wear, even at maximum rotational speeds (for example up to 4000 to 6000 revolutions per minute).

Fig. 8 and 9 show the drive diagrams of the ribbon loom, the reed drive 92, the weft needle drive 94, the knitting needle drive 96 and the secondary drive shaft 100 of the cam gear 34 of the heddle device 10 being connected by the main drive shaft 4 via a single-stage gear mechanism or a worm gear. For the weft needle drive 94 and the knitting needle drive 96, a common disk 102 with a crank 104 is provided on the main drive shaft 4, said crank having diametrically opposite crank pins 106, 108, which crank pins 106, 108 are guided radially adjustably in a recess 110 of the disk 102 or the crank 104, so that their eccentricity can be set. The crank pin 106 provided to the weft needle drive 94 cooperates via a coupling rod 112 with a rocker 114, which rocker 114 is connected in an articulated manner via a further coupling rod 116 to a rocker 118. The latter is fastened to a shaft 120 carrying and driving the weft needle 6. The reed drive 92 is connected to a crank pin 108, the crank pin 108 being connected via a coupling rod 122 to a rocker 124 carrying the reed 7. The needle drive 96 has a cam disk 126 arranged on the main drive shaft 4, and a stop (dog)128 of a double-arm rocker 130 engages on the cam disk 126. A knitting needle 132 is fastened to the end of the rocker 124 facing away from the stop 128, said knitting needle acting on the side of the ribbon to be produced and serving to knot the inserted weft yarn arc.

Fig. 10 and 11 show the weaving zone of the ribbon loom, with a guide plate 134 with guide rails 136 being provided to the side of the knitting needles 132 facing away from the shed 18, so that the weft foot (weft thread leg)138 of a weft thread loop 140 to be caught by the knitting needles 132 is located below the needle head 142 of the knitting needles 132 during the introduction into the shed 18 or at most flush with the needle head 142 of the knitting needles 132, so that the weft foot 138 can be introduced into the hook track (hook track) of the knitting needles 132 when the weft needle 6 exits above the needle head 142. This design provides a particularly reliable engagement, in particular only of the weft thread foot 138 to be processed on the knitting needle 132, which takes place within a very small effective range. The stroke of the knitting needle can be kept extremely low, although the knitting arm ensures reliable tucking of the weft thread foot. This design allows for shorter needles and the needles are less prone to bending, vibration and wear. This in turn gives the ribbon loom a higher performance.

Fig. 12 and 13 show a preferred yarn feeding device 20 for a weft yarn 24. The weft thread 24 picked up from the bobbin 22 by means of the thread transport device 144 reaches the pneumatic compensation device 146, in which pneumatic compensation device 146 the weft thread 24 is guided transversely through a guide tube 148, into which guide tube 148 an air blowing device 150 acts. The weft thread 24 fed at constant speed by the thread transport device 144 is processed intermittently by the weft thread needles 6, so that between two insertions no weft thread is required and an overfeed 152 introduced by the blowing device 150 into the guide tube 148 takes place. A thread eye 154 for the weft thread 24 is present between the compensating device 146 and the weft needle 6. The suction device may replace the blower device 150 or may even be additionally connected to the conduit 148.

Fig. 13 shows a section xiii-xiii of the yarn transfer device 144 of fig. 12, so that the transfer speed of the weft yarn can be set. Yarn transfer device 144 includes a transfer roller 158 disposed on shaft 156 and having a friction surface 160. The friction surface is radially expandable by the actuating device 162, so that the circumferential speed of the conveying roller 158 can be set. The actuating device 162 has an actuating block 164, the actuating block 164 being arranged on the shaft 156 and being made of a non-compressible but elastic material and being arranged between a stop disc 166 and an actuating disc 168 and being compressible by an actuating nut 170 which can be screwed onto the shaft 156. As the compression increases, the shell 172 of the transfer roller 158 expands, so that its diameter D and thus its circumferential speed changes. The weft yarn 24 to be conveyed is pressed against the conveying roller 158 by the pressing roller 174, and is thereby conveyed.

Fig. 14 to 19 show a further yarn transport device 175, in which a carousel 176 carrying a yarn 24 is guided between two conical adjusting disks 180, 182 arranged on a drive shaft 178. The axial distance between the adjustment discs can be set. For this purpose, the spring 184 prestresses the adjusting disks against one another. The conveyor belt 176 is guided by a further deflection roller 186, the distance of which from the adjusting disk can be set by means of an adjusting device 188. The conveyor belt shown in fig. 16 and 17 has a continuous portion 190 of thickness d. On the lower side of the continuous portion, a transverse rib 192 is integrally formed, the height h of which is greater than the thickness d of the continuous portion 190. The continuous portion 190 has a reinforcing insert 194. Fig. 18 and 19 show a further embodiment of the conveyor belt 176a, which additionally has a top-side transverse rib 196.

As can be seen from fig. 14 and 15, the yarn conveying device has a further pressure roller 198 between the adjusting disks 180, 182 and the deflecting roller 186, so that the conveyor belt can be guided in a meandering manner. The thread 24 to be conveyed is received and discharged in the region of the meander-shaped guide.

The yarn transfer device is particularly suitable for weft yarns and in the case of simultaneous ribbon looms producing ribbons next to each other, a plurality of such transfer devices are arranged next to each other on a common drive shaft 178 and a common pivot shaft and can preferably be set by a common adjusting device 188.

Reference numerals

2 machine support 10 heddle device

4 main drive shaft 10a heddle device

6 weft needle 12 rope warp beam support

7 reed 14 rope warp beam

8 16 rope wires of batching device

18-shed 75 support flange

20 yarn feeding device 76 pressure bar

22 spool 78 tensioning screw

24-weft 80 heddle

82 yarn guide hole of 26 tuck yarn

End hole 84 of 28 yarn feeding device

30 harness 86 end hole

88 leg

30a heald frame 90 capture element

32 connecting rod 92 reed driving device

34 cam gear 94 weft needle drive

36 pneumatic return 96 needle drive

38, a-d pivoting lever 98 gear mechanism/worm gear arrangement

40, a-d drive 100 times drive shaft

42 cam 102 disc

44 camshaft 104 crank

46, a-d drive point 106 crankpin

48 joint 108 crank pin

50, a-d pivot axis 110 groove

52 air chamber 112 coupling rod

54 piston 114 Teller

56 pressure relief valve 116 coupling link

118 remote control lever

58 check valve

120 shaft

60 pressure source

122 coupling rod

61 spring return 124 remote lever

Cam disc of 62 upper harness wire spindle rail 126

Stopper for 64 lower harness spindle rail 128

66 heald support 130 remote rod

68 hollow rod 132 needle

70 gap 134 guide plate

72 introduction hole 136 guide rail

74 leading-in hole 138 weft foot

140 arc of weft yarn

142 needle head

144 yarn delivery device

146 compensating device

148 guide tube

150 blower device

152 overfeed

154 yarn guide eye

156 axle

158 transfer roller

160 friction surface

162 actuating device

164 actuating block

166 brake disk

168 actuator disk

170 actuating nut

172 outer casing

174 roller

175 yarn delivery device

176 conveyor belt

176a conveyor belt

178 drive shaft

180 adjustable disk

182 regulating disk

184 spring

186 turning roll

188 regulating device

190 continuous portion

192 transverse Rib

194 reinforcing insert

196 transverse rib

198 pressure roller

Claims (13)

1. A ribbon weaving machine with a heddle device (10, 10a) forming a shed (18) and with heald frames (30, 30a) carrying heddles (80), with weft needles (6) and with at least one yarn feeding device (20, 28), with knitting needles (132) arranged on the side of the shed (18) facing away from the weft needles (6), and with a reed (7), characterized in that the heddle frames (30, 30a) have at least one heddle support (66), which at least one heddle support (66) has a hollow rod (68), which hollow rod (68) has an upper transverse lead-in (72) for an upper heddle rail (62) and a lower transverse lead-in (74) for a lower heddle rail (64), the upright heddle rails (62, 64) being connected via struts (76) arranged in the hollow rod (68) and being connected via struts (76) at the ends of the hollow rod (68), Tensioning screws (78) arranged coaxially with respect to the pressure rod (76) are tensioned to each other.

2. Ribbon loom according to claim 1, characterized in that at least one of the lead-in holes (72, 74) has a transversely vertically oriented support flange (75).

3. Ribbon loom according to claim 1, characterized in that the hollow bar (68) has gaps (70) on two sides opposite each other, distributed over its entire length and offset with respect to each other.

4. Ribbon loom according to claim 1, characterized in that the hollow bar (68) is made of a slidable plastic reinforced by fibers.

5. Ribbon weaving machine according to one of claims 1 to 4, characterized in that the heddle (80) with the thread guide opening (82) is straightened on the heddle rungs (62, 64) by means of end openings (84, 86), that at least the driving heddle rungs (62) have a thinner leg (88), which thinner leg (88) projects transversely with respect to the heddle rungs (62) and engages with a small play into a catching groove (90) of the relevant end opening (84) of the heddle (80), that the end opening (84) provided to the driving heddle rungs (62) completely surrounds the heddle rungs (62), and that a play of up to 0.01 to 0.3mm exists between the leg (88) of the driving heddle rungs (62) and the catching groove (90) of the end opening (84).

6. A ribbon weaving machine as claimed in any one of claims 1 to 4, characterized in that the heddle frames (30, 30a) are provided with pivoting levers (38, 38a, 38b, 38c, 38d), which pivoting levers (38, 38a, 38b, 38c, 38d) can be actuated by a cam (42) at drive points (40, 40a, 40b, 40c, 40d) and are connected to the heddle frames (30, 30a) at driven points (46, 46a, 46b, 46c, 46d), and whose pivoting axes (50, 50a, 50b, 50c, 50d) are at right angles to the plane in which the heddle frames (30, 30a) extend, the distance (A) of the drive points (40, 40a, 40b, 40c, 40d) from the pivoting axes (50, 50a, 50b, 50c, 50d) differing at least in the case of two pivoting levers, so that, during operation, the pivoting levers (38, 38a, 38B, 38c, 38d), and furthermore, pivot axes (50, 50a, 50B, 50c, 50d) at different distances (B) from the driven points (46, 46a, 46B, 46c, 46d) at different distances from a midplane parallel to the direction of displacement of the heddle frames (30, 30a), at right angles to these planes of extension, and passing through the heddle frame centre.

7. A ribbon weaving machine according to one of claims 1 to 4, characterized in that the heddle frames (30, 30a) are in each case movable in one direction by means of an actively acting drive (34) and in the other direction by the action of a spring return (61).

8. A ribbon weaving machine according to one of claims 1 to 4, characterized in that the heddle frames (30, 30a) are in each case movable in one direction by means of an actively acting drive (34) and in the other direction by means of a pneumatic return device (36), the pneumatic return device (36) having a gas volume in a separate gas chamber (52) which can be compressed at the operating frequency by the actively acting drive (34).

9. The ribbon loom as claimed in one of claims 1 to 4, characterized in that it has a main drive shaft (4) which is positioned transversely with respect to the cloth web, to which main drive shaft (4) the reed drive (92), the weft needle drive (94) and the needle drive (96) are connected, the weft needle drive (94) and the reed drive (92) having in each case a rocker (114, 124), the rocker (114, 124) being connected via a coupling element (112, 122) to a 180 ° offset crank pin (106, 108) of the main drive shaft (4) in such a way that the weft needle drive (94) and the needle drive (96) oscillate with respect to one another, and in addition the heddle device (10, 10a) having a secondary drive shaft (100) which is connected via a pair of wheels (98) to the main drive shaft (4).

10. The ribbon loom as claimed in one of claims 1 to 4, characterized in that a guide plate (134) with guide rails (136) is arranged on the side of the knitting needles (132) facing away from the shed (18) in such a way that a weft foot (138) of a weft thread loop (140) to be caught by the knitting needles (132) during the insertion into the shed (18) is located below or at most flush with a needle head (142) of the knitting needles (132) and can be inserted into the hook path of the needle head (142) when the weft needle (6) exits above the needle head (142).

11. Ribbon weaving machine according to any one of claims 1 to 4, characterized in that the weft needle (6) is provided with a yarn feeding device (20), the yarn feeding device (20) having a compensating device (146) for the weft yarn (24), the compensating device (146) being pneumatically operated and designed as a blowing and/or suction device (150), and in that a separate guide eye (154) for the weft yarn (24) is arranged downstream of the compensating device (146) and upstream of the weft needle (6) in the running direction.

12. The ribbon loom of any one of claims 1 to 4, characterized in that it has a yarn transport device (144) for the weft yarn (24), which yarn transport device (144) has drivable transport rollers (158) which are arranged on a shaft (156) with varying peripheral speed and have a friction surface (160), and also has a pressure roller (174) which is pressed against the transport rollers (158) beforehand, comprising the yarn (24) to be transported, which friction surface (160) is formed by a one-piece shell (172), which one-piece shell (172) is radially expandable under the action of an actuating device (162).

13. The ribbon loom of one of claims 1 to 4, characterized in that it has a thread transport device (175) for the weft thread (24), the thread transport device (175) having a rotating conveyor belt (176, 176a), the conveyor belt (176, 176a) transporting the thread (24) and being guided between two conical adjusting disks (180, 182) and a deflection roller (186) and a pressure roller (198), the axial distance between the two adjusting disks on the drive shaft (178) being variable, there being an adjusting device (188) for changing the distance of the deflecting roller (186) from the drive shaft (178), the conveyor belt (176, 176a) having transverse ribs (192) on at least one side, and is guided in a meandering manner around a deflection roller (186) and a pressure roller (198), and furthermore the thread (24) to be conveyed is taken up and discharged in the region of the meandering guide.