EP0301330A1 - Method and device for exchanging cans for a spinning preparatory machine - Google Patents

Abstract

If a spinning preparation machine is fed with fiber tapes from several spinning cans, the empty spinning cans have so far been replaced by an operator with full spinning cans. The sliver contained in the new, full spinning can is picked up by the operator and fed to the spinning preparation machine. The full spinning can (12, 13, 14) is provided in a reserve position and the fiber sliver (57) contained in it is gripped by means of a movable carriage (30) and an arm (37) held thereon and fed to the spinning preparation machine. The full spinning can (12) is then pushed into the position previously occupied by the empty spinning can.

Description

The invention relates to a method for changing spinning cans in a spinning preparation machine, to which a plurality of slivers removed from spinning cans are fed for processing, in which an empty sliver can is replaced by a full sliver can and a sliver contained in the full sliver can is accommodated, and a device for carrying it out of the procedure.

A method of the type mentioned at the outset is used, for example, in lines in which a number of fiber slivers are drawn. The slivers are contained in spinning cans and are fed to the drafting system. Empty spinning cans are replaced by full operators with full spinning cans. Furthermore, the operator removes the sliver contained in the new, full sliver can and feeds it to the drafting system. This manual change of the spinning cans requires considerable effort and great skill on the part of the operator. An exact integration of the beginning of the new sliver into the entirety of the incoming slivers without a recognizable attachment point is not guaranteed.

The object of the invention is to provide a method and a device for changing spinning cans in a spinning preparation machine, which in each case ensures an exact incorporation of the new beginning of the band into the entirety of the incoming slivers and thus increases the quality of the drawn sliver.

The object is achieved in that in a method of the type mentioned the full spinning can is provided in a reserve position, a movable carriage is delivered to the full spinning can, the sliver is gripped by a gripper held on the carriage and inserted into the machine, and in that then the full spinning can is moved to a working position.

Changing the sliver cans and picking up and inserting the sliver contained in the new, full sliver can is carried out automatically. Inaccuracies or errors that can arise from manual intervention are reliably avoided. The sequence of the changing process can be precisely predetermined and set so that an exact integration of the beginning of the new sliver into the entirety of the incoming slivers is possible. Attachments or the like in the drawn sliver can be improved in this way. Due to the automatic process, the changing process is reproducible, so that overall a stretched fiber sliver is obtained with a consistently high quality.

In an embodiment of the method according to the invention, the full spinning can is bypassed by the gripper to capture the sliver. Finding the beginning of the new sliver is also carried out automatically. Manual intervention by an operator is not required.

In a further embodiment, the sliver is sucked in by a suction air flow guided by the gripper. This measure makes it easy to find and detect the new sliver. The only requirement for this is that the beginning of the new sliver hangs, for example, on the outer wall of the full sliver can. A search revolution of the gripper is then sufficient to locate and suck the sliver in any case.

In a development of the method according to the invention, the sliver is placed by the gripper on a feed table. The feed table is used to feed the slivers removed from the spinning cans to the spinning preparation machine. The slivers are arranged in parallel on the feed table. The new sliver is placed on the feed table with the aid of the gripper, so that it is carried along by the slivers present there and is fed to the spinning preparation machine.

It is expedient if the sliver is shortened to a predetermined length before being placed on the feed table. To do this, it is possible to clamp and cut the sliver on the gripper.

In a further embodiment of the method according to the invention, the empty spinning can is pushed out of the working position by the full spinning can. The empty spinning can is therefore only removed at the last possible time, so that unwanted looping or knotting of the sliver removed from the empty spinning can is reliably avoided.

A device according to the invention for changing spinning cans in a spinning preparation machine, to which a plurality of slivers removed from spinning cans are fed for processing, is characterized in that a movable carriage can be moved to a reserve position, a gripper is held on the carriage with which a sliver can be gripped and into which Machine can be inserted, which is contained in a full spinning can provided in the reserve position, and means are provided for moving the full spinning can into a working position.

The new, full spinning can is provided in the reserve position by an operator or automatically with the help of appropriate devices. For example, the car is on Rails can be moved and will be delivered to the reserve position. The gripper attached to the carriage grips the sliver contained in the new, full spinning can and feeds it to the spinning preparation machine for further processing. The full spinning can is then moved to the working position and the changing process is complete.

In an embodiment of the device according to the invention, the carriage and / or the gripper is provided with a rotating device with the aid of which the gripper can bypass the full spinning can. The beginning of the sliver hanging from the side of the full sliver can can be found and detected in this way.

For detection, it is expedient if a suction device is provided, to which a suction opening contained in the gripper is connected. In this way, the detection of the sliver is guaranteed in any case.

The slivers to be processed by the spinning preparation machine are fed to the latter with the aid of a feed table. The spinning cans from which the slivers are removed are arranged in a row in their working position under the feed table. After the sliver of the new, full spinning can has been gripped by the gripper, it is placed on the feed table and the full spinning can is pushed from the reserve position into the working position. The sliver laid on is taken along by the slivers on the feed table and fed to the spinning preparation machine for processing.

• Fig. 1 zeigt eine schematische Darstellung einer erfindungs­gemäßen Wechselvorrichtung in einer Draufsicht,
• Fig. 2 die Wechselvorrichtung der Fig. 1 in einer Seitenan­sicht beim Aufnehmen des neuen Faserbandes und
• Fig. 3 die Wechselvorrichtung der Fig. 1 in einer Darstel­lung entsprechend der Fig. 2 beim Auflegen des neuen Faserbandes auf den Zuführtisch.

Further features and advantages of the invention result from the subclaims and from the following description of an embodiment of the invention made with reference to the drawing.

• 1 shows a schematic representation of a changing device according to the invention in a plan view,
• Fig. 2 shows the changing device of Fig. 1 in a side view when picking up the new sliver and
• Fig. 3 shows the changing device of Fig. 1 in a representation corresponding to Fig. 2 when placing the new sliver on the feed table.

The changing device shown in FIGS. 1 to 3 is assigned to a route, not shown. It is used to replace spinning cans from which slivers are removed, fed to the draw frame and stretched by it. In the embodiment according to FIGS. 1 to 3, a stretch is provided by way of example in which four fiber slivers are stretched simultaneously.

In the changing device shown in FIGS. 1 to 3, three full spinning cans (12, 13, 14) are arranged in a row next to one another in reserve positions. Parallel to the row formed by the full spinning cans (12, 13, 14), a further full spinning can (10) and three empty spinning cans (16, 17, 18) are arranged next to one another in a row in working positions. The reserve positions and the working positions are assigned to one another, so that the full spinning cans (12, 13, 14) can be moved from the respective reserve position into the associated working position with the aid of push cylinders (20). In this process, the full spinning cans (12, 13, 14) are displaced approximately transversely to the rows formed by the spinning cans, as is shown by way of example with the inserted full spinning can (10) in FIG. 1.

The guide and positioning of the full spinning cans (12, 13, 14) when moving from the reserve to the working position can be attached to the push cylinders (20) Push jaws (21) take place. However, it is also possible for the spinning cans (12, 13, 14) to run on inclined roller conveyors which are provided with lateral guides. Retractable pawls or stops can be provided in the roller conveyors for positioning the spinning cans (12, 13, 14).

2 and 3, a carriage (30) can be moved over the spinning cans (12, 13, 14) with the aid of a rail system which is composed of longitudinal rails (32) and transverse rails (33) arranged approximately at right angles to one another, which are attached to the ceiling or other supporting elements. With the aid of the rail system, the carriage (30) can be positioned coaxially via each of the reserve positions assigned to the individual full spinning cans (12, 13, 14), as well as other similar spinning preparation machines.

The carriage (30) is divided into a stationary part (66) and a part (67) which can be rotated about a vertical axis. Two vertically arranged lifting cylinders (35) are attached to the rotatable part (67) at a distance from the axis of rotation. At the ends of the piston rods of the lifting cylinders (35) there is an arm (37) designed as a gripper and a swivel cylinder (40) with which the arm (37) can be swiveled about an approximately horizontal swivel axis (38). In Fig. 2 the arm (37) is shown in a vertically downward position, while in Fig. 3 the arm (37) is arranged approximately horizontally.

The pivot axis (38) of the arm (37) is arranged with respect to the axis of rotation of the rotating device in such a way that the arm (37) in its position shown in FIG. 2 is a short distance from the outer circumference of the full spinning can placed under the carriage (30) (12). When the rotating device rotates, the arm (37) bypasses the full spinning can (12). The length of the lifting cylinder (35) is selected such that the arm (37) is pivoted into the horizontal position in the raised state and then can be lowered into the position shown in FIG. 3 via a feed table (50).

In a manner not shown, a suction device is contained in the carriage (30), to which a suction opening (42), which is arranged at the free end of the arm (37) and is directed towards the axis of rotation of the rotating device, is connected via a hose (43). Furthermore, the arm (37) is provided with a clamping and separating device in a manner not shown.

As can be seen from FIGS. 1 to 3, the feed table (50) already mentioned is arranged above the spinning cans (10, 16, 17, 18) in their working positions, or the like in a manner not shown on carriers. is attached. The feed table (50) is arranged approximately horizontally and forms a rail for feeding the fiber slivers (55) removed from the spinning cans (10, 16, 17, 18) placed underneath. Each of the spinning cans (10, 16, 17, 18) is assigned a feed roller (52) which is arranged approximately horizontally and is mounted on the feed table (50) and over which the sliver (59) removed from the associated spinning can is guided. This is shown by way of example in FIG. 1 on the basis of the full spinning can (10) that is engaged in its working position. The direction of feed of the fiber slivers (55) placed on the feed table (50) is identified by an arrow (64) in FIG. 1.

The operation of the change device described is explained in more detail below. It is assumed that the full spinning cans (12, 13, 14) to be replaced are prepared from a previous operation and transferred to the changing device in such a way that the sliver contained in them is provided with a beginning of the ribbon (57) on the outer wall of the respective full spinning can hangs, as shown by way of example in FIG. 2.

As soon as the spinning cans placed in the working positions under the feed table (50) are almost empty, for example when the ends of the slivers removed lie on the feed table (50), the draw frame and thus the feed of the slivers to their drafting system are switched off. First, the empty spinning can as shown in FIG. 1 is replaced by the full spinning can (10) with respect to the feed most distant from the drafting system. Then the empty spinning cans (16, 17, 18) are pushed out of the working positions one after the other and the full spinning cans (12, 13, 14) are pushed into the working positions.

Before transferring the full sliver can (12, 13, 14), the carriage (30) is positioned coaxially over the full sliver can (12), the arm (37) being located between the full sliver can (12) and the feed table (50) . With the help of the rotating device, the vertically aligned, lowered arm (37) once surrounds the full sliver can (12) and, with the help of the suction air flow generated by the suction device, detects the beginning of the sliver (57) of the sliver contained in the full sliver can (12). The beginning of the band (57) is drawn into the suction opening (42), which is detected with the aid of a light barrier or another sensor. The beginning of the tape (57) is clamped to the arm (37) by the clamping device and shortened to a predetermined length with the aid of the separating device.

Then the arm (37) is raised with the aid of the lifting cylinders (35) and the pivoting cylinder (40) one after the other according to the arrows (60, 61, 62), pivoted outwards and lowered again. As shown in Fig. 3, the arm (37) with the detected tape start (57) is above these feed movements (50). This state is also shown in FIG. 1. The carriage (30) is then moved in the longitudinal direction to the next full spinning can (13), the beginning of the belt (57) passing over the assigned feed roller (52) pulled and at least partially placed on the feed table (50).

At the latest when the carriage (30) has reached the next full spinning can (13), the clamping device is opened so that the beginning of the belt (57) is released by the arm (37) and falls onto the feed table (50). Approximately simultaneously with or after the carriage (30) has been moved, the full spinning can (12) is moved from the reserve position into the working position. During this process, the empty spinning can (16) is pushed out of the working position by the full spinning can (12).

The arm (37) is now brought back into its vertical and lowered position shown in FIG. 2 and the process described is repeated again with the full spinning cans (13 and 14).

Switching off the line before changing the sliver can and the described laying of the respective slivers on the feed table (50) during the sliver can change is coordinated with one another in such a way that the sliver ends of the "old" slivers and the beginning of the "new" slivers are at least partially accurate definable length overlap.

After all empty spinning cans (16, 17, 18) have been exchanged for full spinning cans (12, 13, 14), the draw frame and, if necessary, those with driven feed rollers (52) are switched on again. This has the consequence that the slivers (55) placed on the feed table (50) are fed back to the drafting system, the "new" slivers (55) of the full spinning cans (10, 12, 13, 14) due to the overlap friction created with the "old" fiber belts can be promoted. This overlap area can then be taken into account and compensated for in the route by means of excretion as waste or in another way.

An operator can provide the full spinning cans (12, 13, 14) in the respective reserve positions. The pushed out empty spinning cans (16, 17, 18) can also be removed by an operator. However, it is also possible that with the aid of appropriate conveyors or the like. the full and empty spinning cans are automatically prepared and removed. In this way, a fully automatic changing device can be created, or the like by a control device, in particular a microcomputer. is controlled and no longer requires manual operation.

In a modified embodiment, the respective band starts (57) of the "new" fiber bands (55) removed from the full spinning cans (10, 12, 13, 14) are not placed on the feed table (50), but by the arm (37) Movement of the carriage (30) in the direction of the drafting system pulled over a band rake, not shown, and deposited. In this way it is achieved that the band starts (57) of the "new" fiber bands (55) have an exact starting position when the drafting system is switched on. This position can be taken into account in the drafting system by changing the drawing, so that the quality of the drawn fiber sliver can be improved.

In the methods described so far, the drafting system for changing the spinning cans is stopped. However, it is also possible to keep the drafting system running continuously, especially when changing individual spinning cans. The deviations resulting from such a change due to the briefly missing sliver can be compensated for by the subsequent drafting system or a subsequent regulating section or can be eliminated as waste.

In both a manual and in particular an automatic can change, it is advantageous if in another Embodiment of the invention it is provided that the runout of the slivers from the cans (10, 16, 17, 18) in the operating position is monitored. This can be done, for example, by attaching a marking to the spring plate of the cans (10, 16, 17, 18) which can be recognized by a sensor when this spring plate moves out of the can or when the sliver is removed from the can in question has been and the marking is no longer covered. The operating speed of the machine is then reduced on the basis of the signal which is emitted by the first can (10, 16, 17, 18) which is running out. The can is then changed at a reduced speed, so that it can be ensured that the "new" sliver "can be put on the old sliver" in good time so that the can can be changed without the machine being stopped. When all the cans have been replaced, the machine is raised to the operating position.

Claims (20)

1. A method for changing spinning cans in a spinning preparation machine, which is fed several slivers taken from spinning cans for processing, in which an empty sliver can is replaced by a full sliver can and a sliver contained in the full sliver can is taken up, characterized in that the full sliver can (12) is provided in a reserve position, a movable carriage (30) is delivered to the full spinning can (12), the sliver (57) is gripped by a gripper (37) held on the carriage (30) and inserted into the machine, and that the full spinning can (12) is then moved to a working position. 2. The method according to claim 1, characterized in that for the detection of the sliver (57) the full spinning can (12) by the gripper (37) is bypassed. 3. The method according to claim 1 or 2, characterized in that the sliver (57) from a gripper (37) guided suction air flow is sucked. 4. The method according to any one of claims 1 to 3, characterized in that the sliver (47) is clamped on the gripper (37). 5. The method according to claim 4, characterized in that the sliver (57) is cut. 6. The method according to any one of claims 1 to 5, characterized in that the sliver (57) from the gripper (37) is placed on a feed table (50). 7. The method according to claim 6, characterized in that the gripper (37) is pivoted over the feed table (50). 8. The method according to any one of claims 1 to 7, characterized in that the empty spinning can (16) of the full spinning can (12) is pushed out of the working position. 9. The method according to any one of claims 1 to 8, characterized in that the full spinning cans (10, 12, 13, 14) and the empty spinning cans (16, 17, 18) are automatically provided and removed. 10. The method according to any one of claims 1 to 9, characterized in that the leakage of the slivers from the cans in the operating position is monitored, and that shortly before a runout the working speed of the machine is reduced, which after the can change again to the operating speed is increased. 11. Device for changing spinning cans in a spinning preparation machine to which a plurality of fiber slivers removed from spinning cans are fed for processing, characterized in that a movable carriage (30) can be delivered to a reserve position, a gripper (37) is held on the carriage (30), with which a sliver (57) can be detected and inserted into the machine, which is contained in a full spinning can (12) provided in the reserve position, and means are provided for moving the full spinning can (12) into a working position. 12. The apparatus according to claim 11, characterized in that the carriage (30) and / or the gripper (37) is provided with a rotating device by means of which the full spinning can (12) can be bypassed by the gripper (37). 13. The apparatus of claim 11 or 12, characterized in that a suction device is provided, to which a suction opening (42) contained in the gripper (37) is connected. 14. Device according to one of claims 11 to 13, characterized in that the gripper (37) is provided with clamping and / or separating means. 15. Device according to one of claims 10 to 14, characterized in that lifting means, in particular lifting cylinder (35) for vertical movement of the gripper (37) are provided. 16. The device according to one of claims 11 to 15, characterized in that pivot means, in particular pivot cylinder (40) for pivoting the gripper (37) are provided. 17. The device according to one of claims 11 to 16, characterized in that for the supply of the sliver cans (10, 16, 17, 18) removed fiber slivers (55) a feed table (50) is provided, under which the spinning cans (10, 16, 17, 18) are arranged in their working position. 18. The apparatus according to claim 17, characterized in that means are provided for guiding the spinning cans and for their positioning in the respective reserve and working positions. 19. Device according to one of claims 11 to 18, characterized in that means for automatically providing and removing the full spinning cans (10, 12, 13, 14) and the empty spinning cans (16, 17, 18) are provided. 20. Device according to one of claims 11 to 19, characterized in that the carriage (30) a plurality of similar spinning preparation machines can be delivered.

Images