JPS6244049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a pneumatic threading device for threading the yarn to the axis of the individual yarn spindles, with a pneumatic threading device within each double yarn spindle concentrically to the spindle axis. This invention relates to a double twisting machine equipped with an injector for suction and conveyance.

Double twisting machines of this type are used, for example, in German patent application no. 2541690, in German patent application no. 2035025, in German patent application no.
2461796 and Swiss Patent No. 296617. It is also possible to attach a manually operable threading gun to the thread entrance of the spindle, as described in the patent application publication of the Federal Republic of Germany.
It is known from specification No. 2541690.

In contrast, according to the invention, the injector is located in the thread brake insert of each double-twisted thread spindle, and the thread brake insert has a connecting coupling for the pressurized air supply conduit.

The thread brake insert can be removed from the bobbin support by a simple manual operation in a known manner.
The invention therefore has the advantage that the injector is very simple to adjust and is also easy to maintain and clean.

For this purpose, according to the invention, the injector consists of two parts, the thread entry part of the injector being fixedly connected to the thread brake insert, whereas the thread entry part of the injector is connected to the spindle in the thread brake insert. It is arranged to be movable in the direction of the axis and can be fixed at any position. This makes it possible to adjust the air consumption of the injector, while also adjusting the suction and conveying action of the injector.

The ability to adjust the injector is extremely important when converting the work program of a double twisting machine to different yarn types and yarn finenesses.

Reliable operation of the injector during threading depends in particular on a uniform distribution of the supply air around the opening of the thread guide tube. For this purpose, an annular channel is arranged upstream of the injector, which can be designed, for example, as an annular cavity between the outer and inner barrel walls of the thread brake insert.

According to the measures according to claims 3 and 4, the injector is only connected to the connecting coupling via a very short line system. While this provides manufacturing advantages, it also provides pneumatic advantages.
The pneumatic advantage of this is that the pressure drop between the connecting coupling and the injector is very low, and the supply conduit transmitting the static pressure for actuating the thread brake is also loaded with high static pressure. It is possible.

An advantageous construction of the thread brake insert is also achieved by the design according to claim 5.

The supply of pressurized air to each double strand spindle is
This takes place from a central pressurized air supply via a pressurized air line extending in the longitudinal direction of the double twisting machine and branch lines branching from this.

In a further embodiment for supplying pressurized air to each double-twisted yarn spindle, a moving unit is provided which is movable along the front of the machine, and which moves both the pressurized air supply device and each of the yarn brake inserts. Equipped with a connecting conduit that can be connected to a connecting coupling ring.

In the case of a central supply of compressed air, the compressed air can be supplied by a hose which branches off from the compressed air line and can be manually inserted into the connecting coupling of the thread brake insert via an adapter. For example, the supply of pressurized air becomes easier and more reliable. The hose is temporarily fixedly connected to the connecting coupling, for example by means of a bayonet joint.

In order to prevent untoward pressure air leaks due to inadvertence, the adapter at the end of the hose automatically opens when connecting the hose to the connecting coupling of the thread brake insert and when removing the hose. It has a built-in valve that automatically closes.

In a preferred embodiment, each double-twist yarn spindle is assigned a swiveling arm containing a pressure air conduit, which swiveling arm is arranged pivotably about a swiveling axis parallel to the spindle axis and The free end of the pivot arm has an adapter for a connecting coupling of the thread brake insert.

The use of a central pressurized air supply system is facilitated by the operator's easy access to the connection coupling for the hose or pivot arm;
This is because the connecting coupling is arranged on the side of the thread brake insert above the upper edge of the winding tube, so that it is easily accessible for connecting the branch conduit for supplying pressurized air.

In the case of threading operations, the thread brake arranged in the thread brake insert must be bypassed or released into an inactive state. In a preferred embodiment, in order to pneumatically release the thread brake, the positive or negative pressure that activates this release device is extracted by means of a branch channel that opens in the high-pressure region or in the low-pressure region of the thread guide tube.

Advantageously, the air pressure for disengaging the thread brake is taken from an annular channel upstream of the injector, provided that sufficient space can be utilized by suitably designing the geometrical dimensions of the thread brake insert. be. In this case, if two thread brakes are used in one thread brake insert, an injector is arranged between the two thread brakes and the injector is connected in each case via one branch channel to a device for pneumatically disengaging the thread brakes. It is also possible to supply pressure from the annular passage.

The yarn brake is advantageously constructed as a plate brake consisting of two plates that are substantially abutting in the yarn running plane, ie one plate is a fixed brake plate and the other plate is
A movable brake plate is pressed onto the fixed brake plate by an adjustable spring force.

In the case of pneumatic threading, an air-mechanical device is provided which acts against the spring force of the movable brake plate and which, during threading, moves the movable brake plate away from the fixed brake plate.

In an advantageous embodiment in which the thread brake is pneumatically threaded, one or both brake plates have a recess linearly outside the thread travel path, which recess is provided for threading the thread to the thread brake. It extends from the inlet to the yarn outlet from the yarn brake.

In a very simple and advantageous embodiment, an air duct delimited by the two brake plates is machined into the brake housing which accommodates the two brake plates and in the contact plane of the two brake plates.

The purpose of all the means mentioned above is to guide the thread around the braking surface for threading.
Therefore, after threading, the thread is automatically pulled between the brake plates based on the thread pulling tension generated.

A particularly advantageous device for disengaging the thread brake in an inactive state during pneumatic threading is provided with a pneumatic piston-cylinder unit. That is, piston-cylinder units are arranged on both sides of the yarn path, the push rods of which are mounted on the pistons of these units being directed towards the movable brake plate. These piston-cylinder units are particularly preferably connected to a pneumatic supply line system arranged in the thread brake insert and leading to the injector via a branch channel, the branch channel being A passage supplying the piston-cylinder unit with static pressure at the pressurized air inlet of the thread brake insert. In an advantageous embodiment for the pneumatic control of the piston-cylinder unit, the cylinders are integrated in a line system leading to the injector, and the outlet port of the line system from each cylinder is oriented relative to the inlet port. and are arranged offset in the axial direction of the cylinder such that the piston passes through the outlet port during pressurization. By this measure it is ensured that the pressure necessary to move the movable brake plates apart can be built up satisfactorily in the cylinder.

It is also possible to construct the movable brake plate as a stage piston in order to separate the movable brake plate by pneumatic pressure, and to arrange that both the small piston part and the large piston part of the stage piston are guided in an airtight manner. . In this case, a branch channel branching off from the line system leading to the injector opens into an annular chamber formed by the ring surface of the large piston part of the stage piston.

In a further embodiment, the movable brake plate is coupled to a tension bar, which is fitted with a tension piston, which is connected to the movable brake plate via a branch passage. It is also possible to apply pressure air in the direction of separating the plates.

Next, embodiments of the present invention will be explained in detail with reference to the drawings.

In the double-twisting spindle shown in FIG. 1, a bobbin 1 wound on a winding tube 2 rests on a bobbin support 3 with a protective pot. The bobbin support 3
is rotatably supported on a spindle or rotor 5 via a bearing 4 and can be rotated by known means, for example by a magnet or (in the case of an oblique or horizontal spindle) by a weight. It is immovably secured. The spindle or rotor 5 has a thread guide plate 6 and a thread storage disk 7 and is driven by a weave and a drive belt. The thread is unwound from the bobbin in a known manner, first passing through the thread inlet 8 and then through the thread brake 10. The thread brake 10 includes a fixed brake plate 11 and a movable brake plate 1.
It consists of 2. The movable brake plate 12 is fixed by a spring 13 and has an adjustable spring force.
1 and an adjusting screw 1 for adjusting the spring force.
9 (Figure 2) is used. The thread is then guided through a thread channel 14 as a thread guide tube and leaves the thread storage disc 7, where it is then guided forming a balloon around the bobbin.

According to the invention, an injector 15 for threading
is used and the injector is connected to the thread brake insert 9
It is located inside. In the illustrated embodiment, the injector 15 is located behind the thread brake 10.

Pressurized air is supplied to the injector 15 through an air passage 16. The supply of pressurized air is supplied via an air supply conduit 18, which is led to a connecting coupling 17 of the thread brake insert and temporarily connected thereto, for example in bayonet fashion.

The details of the thread brake insert 9 will now be explained with reference to FIG. It should be noted that the plate type brake provided on the thread brake insert 9 is only one example, and other suitable types of brakes can of course be provided. The plate brake has a fixed brake plate 11 whose braking surface is located in the thread travel plane of the thread path 14 . A movable brake plate 12 is in contact with the fixed brake plate 11 under the pressure of a spring 13. The spring force of the spring 13 is adjusted by rotating the adjustment screw 19. An injector 15 is located behind or below the yarn brake 10 when viewed in the yarn running direction. The injector 15 is supplied with pressurized air by an air supply conduit 18 (in this example a connecting hose) via an air channel 16 and an annular channel 20 as well as a plurality of distribution holes 21 . The air supply conduit 18 has a valve 22 in the illustrated embodiment, the valve body of which is connected to the air supply conduit 1.
8 is a coupling coupling 17 for the thread brake insert 9
Valve seat 24 by spring 23 when released from
The valve is closed when it comes into contact with the valve. When introducing the air supply conduit 18 into the connecting coupling 17 , the valve body of the valve 22 is pressed into the open position by means of a pin 25 fixedly arranged in the air channel 16 . The injector 15 is constructed on proven and reliable principles. The air expanding in the area of the opening 26 flows through the thread passage 14
A negative pressure is generated inside to suck the thread. The thread is then entrained by the air flow behind the opening 26 towards the spindle axis and guided out of the thread guide channel of the thread storage disc 7.

As shown in FIG. 2, the pressurized air supply for the pneumatic piston-cylinder unit used to space the movable brake plate 12 from the fixed brake plate 11 is connected in parallel with the pressurized air supply for the injector. and is formed by a branch channel 36, which branches off from the channel system leading to the injector 15 directly behind the connecting coupling 17 and terminates behind the last piston-cylinder unit. It's on. This ensures that the piston-cylinder unit is loaded with the static pressure generated at the inlet of the thread brake insert, a part of which, as is known, follows the passage system leading to the injector. converted into flow energy.

The injector 15 consists of two parts.
The upper part of the injector with the air and yarn supply channels, viewed in the yarn running direction, is fixedly connected to the yarn brake insert 9. The lower part 27 of the injector has a threaded joint 28
is threadedly connected to the injector upper part by and is axially movable with respect to the upper part. The lower injector part 27 can be fixed in any position relative to the upper part of the injector, thereby preventing positional fluctuations during operation. For this positional fixation, for example, a spring-forced locking element can be used, which locking element is fixedly connected to the lower injector part 27 and is provided on the inner circumferential wall of the upper part of the injector. It meshes with the groove. Such a locking mechanism is well known in the art and will not be described in detail here. The thread brake insert 9 is inserted onto the bobbin support 3 shown in FIG. Thread brake insert 9
can be removed from the bobbin support 3 with a simple operation, and the injector 15 can also be adjusted at this time. This is particularly important when converting the production program of a double-twisting machine to a different twisting material and a different yarn fineness.

A thread brake insert 37 is shown in FIG. 2a as a variant of the thread brake insert 9 shown in FIG. 2, which thread brake insert has a double cylindrical wall in its outer circumferential area. . Outer cylinder wall 38 and inner cylinder wall 39
together form an annular cavity 40 whose function is approximately equivalent to the concentric annular passage 20 shown in FIG. The annular hollow space 40 is sealed airtight from above, ie on the thread inlet side.
On the other side, the injector side, this annular cavity 40 opens into the injector 15 . The outer cylinder wall 38 has a pressurized air passage to the connecting coupling 17 as well as to the annular cavity 40. Outer cylinder wall 3
8 and the inner cylindrical wall 39 can also be mutually supported by ribs, protrusions, etc. not shown.

FIG. 3 shows a side view of a double twisting machine such as that corresponding to design DIN 63955. Furthermore, FIG. 3 additionally shows a central pressurized air supply 31 with a pressurized air line 32 extending along the machine. Hoses connected in a suitable manner and guided and operated by hand serve in each case to supply pressurized air to the relevant spindle field. In the final spindle field, the pivot arm 33 is shown pivotable about the vertical branch conduit 34. As can be seen from FIG. 4, the pivotability of the pivot arm 33 makes it possible to supply pressurized air to one spindle at a time. The pivot arm 33 in the vertical branch conduit 34 to close the air passage of the pivot arm 33
The bearing part is constructed as follows. That is, the radial extension of the branch conduit 34
3 is the connecting coupling 17 of the thread brake insert 9
It is adapted to align with the air conduit 35 in the pivot arm 33 only at the position in which it makes fixed contact with the air conduit 35 in the pivot arm 33. The pivot arm 33 also has a connecting coupling 1 at its end.
7 can be provided with a special adapter for making an airtight connection. The vertical branch conduit 34 is arranged in the vertical central plane of the machine, so that it is possible to supply pressurized air from this branch conduit by means of two pivoting arms to the four spindles. .

FIG. 5 shows different embodiments of the thread brake. In this case, the mechanical actuating mechanisms are located on both sides of the yarn and are thus arranged in the vertical plane of the yarn path in such a way that the movable brake plate 12 is entirely spaced apart from the fixed brake plate 11.

It should be mentioned in the introduction that other brake structures can also be used with the thread brake insert 9, such as brake cartridges, ball brakes, etc. Suitable solutions for deactivating a thread brake of this type during pneumatic threading are known or can be readily devised by a person skilled in the art on the basis of the prior art. The advantage obtained with the solution according to the invention for pneumatically deactivating the yarn brakes is that several yarn brakes, in particular plate brakes, are arranged one after the other in the yarn running direction and that their deactivation is performed pneumatically. It is possible.

FIG. 7 shows a modification of the embodiment shown in FIG. Therefore, parts that are equivalent to those in FIG. 2 are given the same contrasting symbols.

7 and 8 show a thread brake insert with a pneumatic threading device. The difference in FIGS. 7 and 8 compared to the embodiments already described is that the injector 15 is arranged on or in the vertical plane in which the connecting coupling 17 for the air supply conduit 18 is located. It is located nearby. The angle between the communication passage 47 between the connecting coupling 17 and the annular passage 20 and the spindle axis is greater than 45°. The annular passage 20 is
It is particularly advantageous if it is located at the same axial level as the connecting coupling 17.

In the embodiment shown in FIG. 7, the branch passage 36 for supplying static pressure to the piston-cylinder unit 41 which separates the movable brake plate 12 from the fixed brake plate 11 branches directly from the annular passage 20. . Therefore, the piston-cylinder unit 41 is
Being acted upon by the static pressure prevailing in the annular channel 20, the piston 42 moves the movable brake plate 12 away from the fixed brake plate 11 by means of the associated push rod 43. After threading has been completed, the spring 44 pushes the piston 42 together with the push rod 43 back again.

In FIG. 8, the pressure for disengaging the thread brake is taken from the thread guide tube via passage 46.
The passage 46 opens at the front end of the injector 15 where negative pressure prevails. The movable brake plate 12 is designed as a piston, which is guided in a cylinder chamber 45 . The negative pressure therefore causes the movable brake plate 12 to be separated from the fixed brake plate 11 against the force of the spring 13 during threading.

1, as required for a specific purpose of use.
Insofar as two thread brakes are used in one thread brake insert, the connecting coupling and the injector, viewed in the axial direction, are particularly preferably located between the two thread brakes, in which case the connecting coupling and the injector are particularly advantageously located between the two thread brakes for transmitting the static pressure. The branch conduits are biaxially branched from the communication channel between the connecting coupling and the injector or from the annular channel, or alternatively two branch channels leading from the pneumatic disengagement device for both thread brakes to the thread guide pipe. is provided. It should be noted that it is also possible to extract a positive static pressure for disengaging the thread brake at a suitable point in the thread guide tube.

In the simplest case, if air vent holes are provided on the rear side of the movable brake plate, disengagement of the plate-type thread brake shown in the previous embodiment can also be carried out by applying overpressure to the brake surface.

Since variations are again shown in FIGS. 9 and 10, substantially the same reference numerals are used here as well.

In FIG. 9, the movable brake plate 12 is constructed as a step piston having a small piston part 51 and a large piston part 52. Both piston parts 51 and 52 are guided in a gas-tight manner so that the annular chamber 53
occurs, and when threading is performed pneumatically by the injector 15, the annular passage 2 is passed through the branch passage 36.
Pressure air is supplied to the annular chamber 53 from zero.
The pressure in the annular chamber 53 causes the movable brake plate 12 to be separated from the fixed brake plate 11 during the threading operation.

In FIG. 10, the movable brake plate 12 has a tension rod 54 and a tension piston 55. In FIG. In this case, the branch passage 36 opens into a cylinder chamber 56 in which the tension piston 55 can be slidably moved. As a reminder, in the embodiment of FIG. 10, the movable brake plate 12 is pressed against the fixed brake plate 11 by a spring 57 acting on a tension piston 55. The spring force of the spring 57 can be adjusted by means of a closing screw 58, which is connected to the air vent hole 5.
It has 9.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram of a double-twisted yarn spindle with a yarn brake insert according to the invention with an injector;
FIG. 2 is a longitudinal sectional view of an embodiment of the thread brake insert;
2a is a principle diagram of an embodiment of a thread brake insert of the type that supplies pressurized air to the injector through an annular hollow space between the outer cylinder wall and the inner cylinder wall; FIG. A schematic side view of a double-twisting machine with a pressurized air supply; FIG. 4 is a schematic plan view of a pressurized air supply and four double-twisting spindles; FIGS. 7 and 8 are cross-sectional views of a thread brake insert with a pneumatic threading device, and FIGS. 9 and 10 show different implementations of the threading device. FIG. 3 is an example cross-sectional view. 1... Bobbin, 2... Winding tube, 3... Bobbin support, 4
...bearing, 5...rotor, 6...thread guide plate, 7...thread storage disk, 8...thread inlet, 9...thread brake insert, 1
0... Yarn brake, 11... Fixed braking plate, 12... Movable braking plate, 13... Spring, 14... Yarn passage as yarn guide tube, 15... Injector, 16... Air passage, 1
7... Connection coupling ring, 18... Air supply conduit, 1
9...adjustment screw, 20...annular passage, 21...distribution hole,
22... Valve, 23... Spring, 24... Valve seat, 25... Pin, 26... Opening, 27... Injector lower part, 28
...Spring joint, 29...Plug-in piece, 30...O-ring,
31... Centralized pressure air supply section, 32... Pressure air conduit, 33... Swivel arm, 34... Branch conduit, 35...
Air conduit, 36... Branch passageway, 37... Thread brake insert, 38... Outer cylinder wall, 39... Inner cylinder wall, 40... Annular hollow chamber, 41... Piston-cylinder unit, 4
2... Piston, 43... Push rod, 44... Spring, 45... Cylinder chamber, 46... Passage, 47... Communication passage, 51... Small piston portion, 52... Large piston portion, 53... Annular chamber, 54... Tension rod, 55... Tension piston, 56... cylinder chamber, 57... spring, 58...
Closing screw, 59...air vent hole.

Claims (1)

[Claims] 1. A double-twisting machine having a pneumatic threading device for threading the yarn into the axis of each double-twisting spindle, the yarn being sucked into each double-twisting spindle concentrically with respect to the axis of the spindle. The injector for conveyance is arranged and the thread brake inserts 9, 3
7 is a connecting coupling 1 for a pressurized air supply conduit 18, 35 with a line system leading to the injector 15;
7, characterized in that the injector 15 is located in the yarn brake insert 9, 37 of each double-twisting spindle.