JPH0120258B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a weft length measuring device, and more particularly to a drum-type weft length measuring device for a shuttleless loom.

Prior Art In general, shuttleless looms, and jet looms in particular, are provided with a weft length measuring device for measuring and storing a weft of a length necessary for one weft insertion in advance. As this type of weft length measuring device, there is a so-called pipe type weft length measuring device in which the weft is carried in an air flow and stored in a storage pipe. However, with this pipe-type weft length measuring device, there is a relatively large resistance when the weft inside the storage pipe is pulled out by the airflow during weft insertion, and the weft is inserted into the storage pipe using the airflow. Because of this, it is difficult to store exactly the length of weft needed for one weft insertion.
As a result, the weft insertion operation becomes unstable and weft insertion errors tend to occur.

In order to solve the above-mentioned defects of the pipe-type weft length measuring device, the weft supplied from the yarn supply bobbin is continuously wound in a coil shape around the tapered circumferential surface of the weft storage drum, and this winding is carried out during weft insertion. A drum-type weft length measuring device that pulls out the taken weft has been proposed. This weft length measuring device is provided with a pair of weft engaging pins that control the winding amount and withdrawal of the weft yarn so as to be retractable from the tapered circumferential surface of the weft storage drum.

The weft engagement pin provided in this type of conventional drum-type weft length measuring device is configured to rotate along a plane perpendicular to the axis of the drum. Of the wefts wound into a coil shape, the weft of the first turn remains locked until the moment the weft engagement pin sinks into the drum, and the wefts of the second and subsequent turns become the weft of the first turn. There is a tendency to move over the weft threads and move in the weft drawing direction. This has the disadvantage that the weft threads become tangled, which impedes the weft insertion function. In addition, the drum has a long hole formed in the circumferential direction so that the weft engagement pin can move in and out of the drum, and the weft of the first roll in this long hole part is connected to the weft of the second and subsequent rolls. Since it is located inside the drum compared to the weft threads on the circumference of the drum, the weft threads of the second and subsequent rolls move over the weft threads of the first roll at the moment the weft engaging pin sinks into the drum. This has the disadvantage that the weft threads tend to become tangled, which impedes the weft insertion function.

Purpose This invention was made in order to solve the above-mentioned defects of the conventional device, and its purpose is to smoothly move the weft wound in the drawing direction while maintaining the winding pitch of the weft thread coiled around the drum. To provide a weft length measuring device that can be moved, has no fear of interfering with the weft insertion function, is easy to assemble, and has high durability even in high-speed operation.

Embodiment An embodiment embodying the present invention will be described below with reference to the drawings. A bracket 2 is fixed to a frame 1 located on the side of the loom bed of a loom by bolts 3, and the front side (the right side in FIG. ) has gear 4
are integrally formed. A support arm 5 having a hanging portion 5a facing the bracket 2 is fixed to the upper part of the bracket 2 by a bolt 6. A rotary support shaft 8 having a thread guide hole 7 at its axis is rotatably supported between the bracket 2 and the hanging portion 5a of the support arm 5 via a bearing 9. A toothed pulley 10 is fixed to the rotating support shaft 8 between the bracket 2 and the hanging part 5a by a key 11, a taper bush 12, and a nut 13, and is rotated by a timing belt 14 driven in synchronization with the weaving operation. It's becoming like that.

A support bracket 15 having a fitting hole 15a is provided on the rear side of the hanging portion 5a of the support arm 5, and a support bracket 15 has a fitting hole 15a.
It is fixed by 6. The air injection nozzle 19 has a thread insertion hole 17 formed in its axis and an acceleration tube 18 fitted in its tip, and its tip is connected to the rotation support shaft 8.
It is rotatably inserted into the thread guide hole 7 of. A flange portion 20 is formed approximately in the center of the air injection nozzle 19, and the base end portion is formed to have a small diameter and a male thread portion 21 is formed. The air injection nozzle 19 has a base end attached to the support bracket 1.
5, and is fastened to the support bracket 15 with a nut 22 with the flange portion 20 in contact with the end surface thereof. The air injection nozzle 19 is formed with an air supply hole 24 that communicates the thread insertion hole 17 with an annular space 23 formed by the outer surface of its base end, the fitting hole 15a, and the front end surface of the nut 22. ing. A compressed air supply pipe 25 communicating with the support bracket 23 is provided.

A flange 2 formed at the middle part of the rotation support shaft 8
As shown in FIG. 2, a horizontally elongated support 27 is press-fitted and fixed to 6. As shown in FIG. Tip shaft portion 2 of rotation support shaft 8
A bracket 30 integrally formed with a gear 29 is supported at the base end of the bracket 8 via a pair of bearings 31 so as to be rotatable relative to the distal end shaft portion 28. As shown in FIG. 2, a pair of rotary shafts 32 extending in the axial direction of the rotary support shaft 8 are rotatably supported on both sides of the support body 27 via bearings 33, respectively. A pair of planetary gears 34, 35, 36, 37 are fixed to both ends of both rotating shafts 32, respectively, meshing with the gears 4, 29 as sun gears. Then, the support body 27 rotates with the rotation of the rotation support shaft 8, and the planetary gears 34, 3
To ensure that the gear 29 is always kept stationary even when the gears 5, 36, and 37 rotate while meshing with the gears 4 and 29, the number of teeth of the gear 4 and the gear 29 is the same, and each of the planetary gears 34, 35 , 36, and 37 have the same number of teeth. Further, a thread winding tube 38 is fixed to the support body 27 in a diagonally penetrating state so as to communicate with the thread guide hole 7 of the rotation support shaft 8, and a thread guide made of wear-resistant ceramic is provided at the base end of the thread winding tube 38. 39 are provided.

On the front side of the bracket 30, a length measuring drum 40 for winding the weft from the yarn winding tube 38 is fixed at its side wall surface portion 41 with bolts 42, and at the tip of the tip shaft portion 28, the peripheral wall surface portion 4 of the length measuring drum 40 is fixed.
3 is rotatably supported via a bearing 44. The side wall surface portion 41 and the peripheral wall surface portion 43 are integrally fixed by a pair of fixing bolts 45 and 46, as shown in FIG. As shown in FIG. 6, two grooves 47 and 48 are formed on the upper side of the peripheral wall surface portion 43 so as to be perpendicular to the circumferential direction, and on the lower side, as shown in FIG. 3, a plurality of guide grooves 49 are formed. A flange 50 having an integrally protruding structure is provided. Same guide groove 49
A thread winding rod 51 for changing the length measurement amount of the weft thread wound around the length measuring drum 40 is movably attached to each of the thread winding rods 51 .

A first cam 52 has bearings 53 and 54 in its support cylinder portion 52a in the middle of the tip shaft portion 28.
A second cam 55 is supported for relative rotation through a support cylinder 52a, and a gear 56 is integrally formed on the support cylinder 55a on the outer peripheral surface of the support cylinder 52a. is fixed. A gear 58 is attached to the key 5 at the tip of the tip shaft portion 28.
9 so that they can rotate together. A gear 60 having a larger diameter than the gear 58 that meshes with the gear 58 is rotatably attached to the peripheral wall portion 43 via a bearing, and a gear 61 that meshes with the gear 56 is fixed to the gear 60 with bolts 62. There is.
When the gear 58 rotates together with the tip shaft portion 28, the gear 56 is rotated via the gears 60 and 61, and the first cam 52 and the second cam 55 rotate together with the gear 56.

Side wall surface portion 41 and peripheral wall surface portion 43 of length measuring drum 40
As shown in FIGS. 3 and 4, arms 63 and 64 are rotatably supported by the fixing bolts 45 and 46 that fix the two together, and push-up pins 65 and 66 are fixed to the tips of the arms 63 and 64, respectively. At the same time, bearings 68 and 67 as cam followers that contact the first cam 52 and the second cam 55, respectively, are fixed by bolts 69, respectively.

As shown in FIG. 1, a support bracket 70 is protruded from the upper inner surface of the side wall surface portion 41, and two guide tubes 71 and 72 are provided on the support bracket 70 in a direction perpendicular to the outer peripheral surface of the length measuring drum 40. It is fitted. Both guide tubes 71 and 72 have an engaging plate portion 7 at the lower end.
3a, 74a have small diameter male threaded portions 73b, 7 at their upper ends.
Rods 73 and 74 as supporting members each having integrally formed rods 4b are slidably inserted therein.
As shown in FIG. 5, keys 75 are fixed to both rods 73 and 74 (only one is shown), and when the keys 75 fit into key grooves 76 formed in the guide tubes 71 and 72, the rods rotate. It is designed to have a stopping action and a guiding action. Further, engagement plate portions 73a, 74 are provided on the outer peripheral surfaces of the guide tubes 71, 72.
Compression springs 77 and 78 are wound around the rods 73 and 74 to urge the rods 73 and 74 in the axial direction of the length measuring drum through the rods 7a.

At the ends of the rods 73 and 74, there is a mounting bar 79,
80 are fixed by nuts 81 and 82 so as to be orthogonal to the rods 73 and 74, respectively, and the tips of the mounting bars 79 and 80 are provided with the winding amount of the weft with respect to the measuring drum 40 and the weft pull-out of the wound weft. In order to control the movement in the direction, a pair of weft engaging pins 83 and 84 that alternately appear and retract from the circumferential wall surface 43 of the length measuring drum 40 through the grooves 47 and 48 are connected to a push screw as shown in FIG. 85, respectively. The mounting bars 79 and 80 have a fifth
As shown in the figure, elongated holes 86 extending in the axial direction of the length measuring drum 40 are formed, and the male threaded portions 73b, 74b of the rods 73, 74 are fitted into the elongated holes 86, and then tightened with nuts 81, 82. The length measuring drum 40 is fixed, and its fixed position can be moved and adjusted in the axial direction of the length measuring drum 40. One weft engagement pin 8 sinks into the peripheral wall surface 43 during weft insertion
4 is located on the weft withdrawal side (right side in FIG. 1) than the other weft engagement pin 83 that protrudes from the peripheral wall surface portion 43 during weft insertion.

The first cam 52 and the second cam 55 have cam surfaces so that the two weft engagement pins 83 and 84 alternately appear and disappear once each into the peripheral wall surface 43 during one rotation of these cams. The shape is set. That is, both cam plates 52 and 55 have a large diameter part and a small diameter part, and as shown in FIG.
When the large diameter portion of the second cam 5 is in contact with the bearing 68 supported at the tip of the arm 64, the second cam 5
The small diameter portion of the arm 63 comes into contact with a bearing 67 supported at the tip of the arm 63.

Next, the operation of the weft length measuring device configured as described above will be explained.

Now, when operating this weft length measuring device, first, the weft engaging pin 84 located on the drawer side of the length measuring drum 40 is protruded from the peripheral wall surface part 43 as shown in FIG. The weft yarn is passed from the yarn supply bobbin (not shown) through the yarn insertion hole 17 of the air injection nozzle 19, through the yarn guide hole 7 of the rotation support shaft 8, to the outlet of the yarn winding tube 38, and after being wound around the length measuring drum 40 a predetermined number of times. , the weft is guided to a weft insertion means (not shown) and set. In the apparatus of this embodiment, the weft thread is carried to the outlet of the winding tube 38 by the air flow injected from the air injection nozzle 19, so that the weft thread threading can be carried out extremely easily.

Next, when the loom starts operating in this state, the timing belt 14 is driven in synchronization with the weaving movement.
The toothed pulley 10 is rotated, and the rotation support shaft 8 is also rotated together with the toothed pulley 10 via the key 11. When the rotation support shaft 8 rotates, the support body 27
The planetary gears 34, 35, 36, and 37 supported by the support body 27 revolve around the gears 4 and 29 while meshing with them. Each planetary gear 3
4, 35, 36, 37 teeth are formed in the same number,
Since the gear 4 and the gear 29 are formed to have the same number of teeth, the gear 29 is always held stationary even when the planetary gears 34, 35, 36, and 37 revolve around the gears 4 and 29. . Therefore, the length measuring drum 40 fixed to the bracket 30 formed integrally with the gear 29 is always kept stationary even when the rotary support shaft 8 rotates. On the other hand, since the yarn winding tube 38 fixed to the support body 27 rotates together with the rotating support shaft 8, its tip revolves around the length measuring drum 40, and the weft is wound around the length measuring drum 40. It will be done.

On the other hand, when the rotational support shaft 8 rotates, a gear 58 fixed to the tip shaft portion 28 via a key 59 rotates together with the rotational support shaft 8, and a gear 60 meshing with the gear 58 and a gear 60 fixed to the gear 60 rotate. The first cam 52 and the second cam 55 rotate together around the tip shaft portion 28 through the gear 61 and the gear 56 that meshes with the gear 61, with the rotational speed being reduced compared to the rotational speed of the rotation support shaft 8. . The thread winding tube 38 rotates an appropriate number of times between one weft insertion operation and the next weft insertion operation, and winds the weft of the length necessary for one weft insertion around the length measuring drum 40. However, during this time, the rotational speed is reduced by the gears 56, 58, 60, and 61 so that the first cam 52 and the second cam 55 rotate once.

As shown in FIG. 1, one of the weft engagement pins 84 protrudes from the peripheral wall surface 43 and the weft is being wound.
When the small diameter portion of the second cam 55 and the bearing 67 supported by the arm 63 are rotated, the arm 63 rotates clockwise in FIG. Against the force, Rod 73 begins to be pushed upwards. When the large diameter part of the second cam 55 comes into contact with the bearing 67, the pushing up is completed, and the other weft engagement pin 83, which is attached to the tip of the rod 73 via the attachment bar 79, moves around the weft thread as shown in FIG. The state is changed from a state sunk in the wall surface part 43 to a state protruding outward from the peripheral wall surface part 43, and the weft thread to be wound subsequently by the thread winding tube 38 is reliably separated from the weft thread previously wound around the length measuring drum. , both weft engagement pins 83,
Between 84 and 84, a weft of a length necessary for one weft insertion is wound.

The first cam 52 and the second cam 55 further rotate,
When the contact between the large diameter portion of the first cam 52 and the bearing 68 supported by the arm 64 is completed, the rod 7
4 is pushed down along the guide tube 72 by the compression spring 78, and one of the weft engagement pins 84, which had been held in a protruding state until then, begins to retract perpendicularly to the peripheral wall surface portion 43. When the small diameter portion of the first cam 52 and the bearing 68 come into contact, one of the weft engaging pins 84 is completely recessed into the peripheral wall surface portion 43, and immediately after that, the weft insertion operation is started, and the weft engaging pin 84 is Weft insertion is performed by a weft insertion device (not shown) while the weft yarn wound up between 83 and 84 is pulled out. The other weft engagement pin 83 located on the side of the thread winding tube 38 continues to be held in a protruding state even during the weft insertion operation, and restricts the weft wound by the thread winding tube 38 from moving to the drawing side.

With one weft insertion operation, the weft that has been wound forward of the other weft engaging pin 83 is completely pulled out. Thereafter, when the first cam 52 and the second cam 55 rotate, the large diameter portion of the first cam 52 comes into contact with the bearing 68 again, the arm 64 is rotated counterclockwise in FIG. 3, and the push-up pin 66, the rod 74 is pushed upward along the guide tube 72 against the biasing force of the compression spring 78, and one of the weft engagement pins 84 protrudes from the peripheral wall surface portion 43.
After that, the small diameter portion of the second cam 55 is connected to the bearing 6.
7, the rod 73 is pushed down by the compression spring 77, and the other weft engagement pin 83 is completely recessed into the peripheral wall surface portion 43 again. Then, the weft wound on the length measuring drum 40 in a state where the transition to the drawer side is regulated by the weft engagement pin 83 moves to the drawer side, and the weft yarn engaging pin 84 that protrudes causes the weft yarn to be moved to the drawer side. is regulated.
Thereafter, both weft engagement pins 83 and 84 are moved in and out in exactly the same manner as described above, and weft length measurement and weft insertion are performed.

Both weft engagement pins 83 and 84 are connected to the fixed guide tube 7.
It is attached via attachment bars 79, 80 to the rods 73, 74 that slide inside the drums 1, 72, and moves in and out of the peripheral wall surface 43 by linear movement, so that it moves in and out of the drum by rotational movement along the circumferential direction. Unlike the conventional device that appears and retracts, the weft thread engaging pin 8
The weft of the first turn held by the wefts 3 and 84 is held until the moment when the weft engaging pins 83 and 84 sink into the peripheral wall surface 43, and the weft of the second and subsequent turns becomes the weft of the first turn. The weft threads are not tangled by passing over the weft threads and moving in the weft drawing direction.

Further, the groove 4 guides the weft engagement pins 83 and 84 to move in and out of the peripheral wall surface 43 due to linear movement.
7 and 48 have a narrow groove width in the circumferential direction of the measuring drum 40,
As shown in FIG. 6, it is formed to extend in the axial direction of the length measuring drum 40, so that the weft of the first roll, which is engaged with the weft engagement pins 83 and 84, is the weft of the second and subsequent rolls. Compared to the weft, the weft engagement pins 83 and 84 are not located inside the peripheral wall surface portion 43.
When the weft engagement pin is recessed into the circumferential wall surface 43, the weft wound in the weft pulling direction is regulated and wound in the weft pulling direction while maintaining its winding pitch when the weft engaging pin is recessed into the peripheral wall surface portion 43. The transition will be smooth.

Furthermore, arms 63, 64, which are rotated by the cams of the cam mechanism, are interposed between the rods 73, 74 that support the weft engagement pins 83, 84 and the cam mechanism that moves the rods 73, 74 in a straight line. let me,
Moreover, since each of these parts is formed separately, it is very easy to assemble them into the length measuring drum 40, and accuracy errors can be absorbed at the contact parts of each member, so high-speed operation is possible. Not only is the followability over time improved, but the durability is also significantly improved.

In this embodiment, a plurality of thread wrapping rods 51 are attached to the lower side of the peripheral wall surface 43 so that they can be moved and adjusted, so even when changing the weaving width etc., the fixing position of the thread wrapping rods 51 can be changed. By simply doing this, the amount of winding on the length measuring drum 40 can be easily set to a corresponding value. Also, the mounting bar 7 to which the weft engagement pins 83 and 84 are fixed
Since the fixing positions of pins 9 and 80 can be adjusted by moving in the axial direction through the long holes 86, the protruding and retracting positions of both weft engagement pins 83 and 84 can be adjusted to optimal positions that suit the operating conditions of the loom. Can be easily changed.

Note that the present invention is not limited to the above-mentioned embodiment, and instead of using a planetary gear mechanism to hold the measuring drum 40 in a stationary state, it may be configured to be held in a stationary state by a magnet, a weight, or the like. Alternatively, contrary to this embodiment, the winding tube 38 may be held stationary and the length measuring drum 40 may be rotated to wind the weft yarn. It is also possible to arbitrarily change the shape, configuration, etc.

Effects As detailed above, the present invention uses a pair of weft engaging pins that alternately appear and disappear on the circumferential surface of the drum in order to control the winding amount of the weft on the drum and the transition of the wound weft in the weft pulling direction. A supporting member supporting each of the cams is linearly movably supported on a fixed guide member provided inside the drum, and the supporting member is biased in a direction in which the weft engagement pin is sunk into the drum. An arm that is swung by a mechanism and constantly in contact with the support member is rotatably supported in the drum, and the arm is swung by the operation of the cam mechanism to cause the support member to move in a straight line. As a result, the weft thread engaging pin protrudes and retracts almost perpendicularly to the drum peripheral surface, and since the groove width in the drum circumferential direction of the groove that guides the weft thread engaging pin's protrusion and retraction is narrow, the drum circumference is regulated by the weft thread engaging pin. The weft threads wound around the surface do not move over the weft threads from the first roll than the weft threads from the second roll.
To smoothly shift to a weft drawing direction while maintaining a winding pitch. Therefore, unlike the conventional device, when the weft wound around the drum moves in the weft pulling direction, the weft does not become tangled and the weft insertion function is not hindered. In addition, since an arm is interposed between the support member that supports the weft engagement pin and the cam mechanism, and each of these is formed separately, it is difficult to assemble them into the length measuring drum. In addition, accuracy errors can be absorbed at the contact portions of each member, which not only improves followability during high-speed operation but also significantly improves durability.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment embodying the present invention, FIG. 2 is a partially cutaway plan view of a planetary gear portion, and FIG. 3 is a sectional view taken along line AA in FIG. 1.
Fig. 4 is a partially omitted sectional view of the length measuring drum showing the arm portion, Fig. 5 is a longitudinal sectional view showing the mounting structure of the weft thread engaging pin, and Fig. 6 is a partial plane view showing the protruding and retracting positions of the weft thread engaging pin. It is a diagram. Rotation support shaft...8, thread-wound tube...38, length measuring drum...40, peripheral wall surface section...43, groove...47, 48, first cam...52, second cam...55, arm...63,6
4, Guide cylinder...71, 72, Rod...73, 7
4, Compression spring...77, 78, Weft engagement pin...8
3,84.

Claims (1)

[Scope of Claims] 1. In a weft length measuring device that winds a weft supplied from a yarn supply bobbin in a coil shape around a drum and pulls out the weft at the time of weft insertion, the amount of winding of the weft with respect to the drum and the amount of winding In order to control the movement of the weft threads into the weft drawing direction, support members that support a pair of weft thread engaging pins that alternately appear and retract from the circumferential surface of the drum are attached linearly to a fixed guide member provided inside the drum. The supporting member is movably supported in the drum, and the supporting member is biased in a direction in which the weft thread engaging pin is sunk into the drum, and the arm, which is swung by a cam mechanism and constantly in contact with the supporting member, is rotated into the drum. 1. A weft length measuring device, characterized in that the arm is swung by the operation of the cam mechanism to cause the support member to move in a straight line. 2. The support member is a rod having a weft engagement pin protruding from one end and an engagement plate portion at the other end, and is inserted through the cylindrical guide member and wound around the circumferential surface of the guide member. Claims characterized in that the drum is biased in the axial direction of the drum via the engagement plate portion by a compression spring installed therein, and is in contact with an engagement pin fixed to the arm at the engagement plate portion. The weft length measuring device according to item 1.