JPH043010Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a sliver supply and stop device for a roller draft device.

(Prior art) In general, spinning machines have two different surface speeds.
A so-called roller draft type drafting device is widely used, in which two or more sets of rollers are installed and the fiber bundle is successively thinned by utilizing the difference in surface speed between the rollers.
The roving frame adopts a method in which the entire machine is stopped when the thread breaks, thereby stopping the supply of sliver to the draft device and performing the splicing operation, which reduces the operating efficiency of the machine. be. On the other hand, ring spinning machines use a method in which the sliver is continuously fed to the draft device without stopping even when the thread breaks, and the new machine suction removes the supplied sliver by suction until the operator completes the splicing. Therefore, there is a disadvantage that there is a large loss of raw materials.

If the above-mentioned method of constantly supplying sliver even during yarn breakage and suctioning it away with a new suction is applied to high-speed spinning machines such as binding spinning machines, which have made remarkable progress in recent years, the loss of raw materials will be large and it will be difficult to do so. This is not only economical, but also poses a problem in that if the pneumatic suction fails in suction, the fiber bundle will wrap around the rotating part, leading to accidents such as breakage.

In order to solve the above problem, as shown in FIG. 7, the rotation of a back bottom roller drive shaft 41 common to all spindles is transmitted to a clutch 44 via gears 42 and 43, and a pulley 45, belt 46, and pulley 47 are A device has been proposed in which the back bottom roller 48 is driven through the back bottom roller 48. In this device, when the yarn breaks, the clutch 44 is released to stop the back bottom roller 8, the sliver is cut between the back roller and the next downstream roller, and the sliver supply is stopped. However, conventional electromagnetic clutches used in spinning machines are of a type in which the clutch is held in a connected state by the force of a spring, and the clutch is disengaged against the force of the spring when electricity is applied. Therefore, in the event of a failure in the electrical system or a disconnection, the clutch is held in the connected state, so even if the thread breaks, the sliver supply is not stopped and the sliver wraps around the roller, quickly destroying surrounding parts. There is a risk of damaging the bottom roller or deforming the bottom roller. In addition, in order to improve the productivity and save labor of spinning machines, doffing and yarn splicing operations are being automated, but the quality (length, thickness, ) is greatly affected by the sliver supply timing. In order to maintain good yarn quality, it is necessary to control the joint length to a few centimeters or less, and to achieve this, it is necessary to suppress the variation in clutch connection time to a few millimeters. However, in the conventional clutch, since the clutch is connected by the return force of the spring, a timing shift of about 50 mmsec occurs in the clutch connection timing. Note that the conventional device has the problem that it is necessary to separately provide a brake device, making it difficult to downsize the device.

(Problems to be solved by the invention) This invention solves the problem of the poor response time when connecting the clutch in the conventional device and the inability to stop the sliver supply in the event of failure or disconnection of the thread breakage detector or clutch operating circuit. This solves the problem of damage to the parts and makes it possible to make the device more compact.

Structure of the Invention (Means for Solving Problems) In this invention, the back rollers are arranged so as to be drivable for each spindle, and are rotationally driven from a back bottom roller drive shaft common to all spindles via a gear mechanism.
The transmission gear that meshes with the driven gear provided on the back bottom roller shaft is rotatable coaxially with the drive gear that is driven by meshing with the gear provided on the back bottom roller drive shaft that is common to all spindles. movably supported. A clutch mechanism is provided between a side surface of the drive gear and a side surface of the transmission gear, and an engagement portion that can be engaged with a fixed brake member is provided on the other side of the transmission gear. The transmission gear is biased by a spring so that the engaging portion engages with the brake member.
An electromagnet is provided which holds the transmission gear in the clutched state against the biasing force of the spring when energized.

(Function) In the device of this invention, the back bottom rollers are rotated one spindle at a time from a back bottom roller drive shaft common to all spindles via gears and clutches, and the sliver is supplied by driving the back bottom rollers. The transmission gear is biased by a spring in the direction of engagement with the brake member, and in the energized state, the clutch is held in the connected state against the spring force by the action of the electromagnet. When a yarn breakage occurs during spinning, the electromagnet is de-energized by a detection signal from the yarn breakage detector, and the transmission gear is immediately urged toward the brake member by the spring force, stopping the back bottom roller drive. Then, the sliver supply is stopped. Furthermore, in the event of a failure or disconnection of the thread breakage detector and clutch operation circuit, the electromagnet will not be energized and the transmission gear will be held in a state where it is pressed against the brake member, and the sliver will not be supplied. It is reliably prevented from being unable to deal with yarn breakage during spinning operation and causing equipment damage.

On the other hand, since the clutch is actively engaged by the force of the electromagnet, the clutch engagement speed is increased and the variation in engagement time is reduced.

(Example) Examples 1 to 6 that embody this idea are as follows.
This will be explained according to the diagram. As shown in FIGS. 2 and 3, a roller stand 2 is fastened to the roller beam 1 for each staff by bolts 3 in a state perpendicular to the longitudinal direction of the machine. A front bottom roller 4 is rotatably supported at the front upper part of the roller stand 2 via a bearing 4a. On the slide member 6 which is tightened and fixed to the rear roller stand 2 of the front bottom roller 4 by bolts 5,
A middle bottom roller 7 is rotatably supported via a bearing 7a. Further, at the rear upper end of the roller stand 2, an arm 11 for supporting a front top roller 8, a middle top roller 9, and a back top roller 10 is rotatably supported at its base end.

A support bracket 13 for supporting the support pipe 12 along the longitudinal direction of the machine is fixedly supported by bolts 14 on the rear lower surface of the roller stand 2. A back bottom roller drive shaft 15 common to all the spindles is loosely inserted into the support pipe 12 and is rotatably supported via a bearing 16. The back bottom roller drive shafts 15 are connected via couplings 17 every few spindles, and
It is designed to be rotationally driven from the end on the gear end side via a gear train 18.

A back bottom roller 1 is attached to the support pipe 12.
A case 20 serving as a support member for rotatably supporting the roller beam 1 as a set of two spindles is rotatably supported at its base end, and is fastened onto the roller beam 1 via a bolt 21 as shown in FIG. It is fixedly supported via a bolt 23 by a bracket 22 that is attached and fixed. As shown in FIG. 1, the back bottom roller shafts 19a are rotatably supported one spindle at a time through bearings 24 at the ends of the case 20, and each back bottom roller shaft 19a has a driven gear 25 that rotates integrally therewith. Possibly fixed. Inside the case 20, the back bottom roller drive shaft 1 is installed in the center of the back roller, which is composed of a set of two spindles.
A drive gear 27 meshing with a gear 26 formed in 5
is rotatably supported by a shaft 28. On both sides of the driving gear 27, a transmission gear 29 that meshes with the driven gear 25 is supported on the shaft 28 so as to be rotatable with respect to the shaft 28 and movable in the axial direction. A large number of triangular teeth 27a forming a dog clutch are formed on both sides of the drive gear 27. Furthermore, triangular teeth 29a that mesh with the triangular teeth 27a are formed on one side of the transmission gear 29 that faces the drive gear 27, and the case 20 is formed on the other side.
A triangular tooth 29b is formed as an engaging portion that engages with the triangular tooth 30a of the brake member 30 fixed to the brake member 30. The shaft 28 has a triangular tooth 29b between the drive gear 27 and the transmission gear 29.
A coil spring 31 is wound around the brake member 30 so that the brake member 30 engages with the triangular teeth 30a of the brake member 30.
Further, the transmission gear 2 is located near both ends of the shaft 28.
The operating member (armature) 3 is in contact with 9.
2 is slidably inserted on the shaft 28, and the actuating member 32 is connected to the drive gear 27 on the outer periphery of the shaft 28 when energized.
An electromagnet 33 is provided to attract and hold it to the side.
The electromagnet 33 is deenergized and demagnetized when the yarn breakage detector detects yarn breakage. Incidentally, the case 20 is provided with a trumpet 34 for guiding the sliver to the back bottom roller 19.
is installed.

Next, the operation of the apparatus configured as described above will be explained. During normal spinning, the coil of the electromagnet 33 is energized to keep the electromagnet 33 in an excited state, and the attraction force of the electromagnet 33 causes the operating member 32 to move to the drive gear 27.
sucked to the side. As a result, the transmission gear 29 is pushed toward the drive gear 27 against the spring force of the coil spring 31, and the triangular teeth 27a and 29a are held in the engaged state, that is, the clutch is connected, and the drive gear 27 Since the back bottom roller drive shaft 15 is rotated integrally with the gears 26 and
is transmitted to the back bottom roller shaft 19a via the driving gear 27, transmission gear 29 and driven gear 25,
The back bottom roller 19 is driven to rotate and the sliver is continuously fed.

When the thread breakage detector detects thread breakage, the detection signal de-energizes the electromagnet 33.
3 disappears, and the urging force of the actuating member 32 disappears, so the transmission gear 29 moves along the shaft 28 toward the brake member 30 together with the actuating member 32 by the spring force of the coil spring 31. The triangular teeth 29b mesh with the triangular teeth 30a of the brake member 30, and the transmission gear 29 is reliably stopped, the back bottom roller 19 is also stopped, and the supply of sliver is immediately stopped.

If the spinning speed and sliver supply speed are high, such as in a binding spinning device, if the sliver supply is not stopped immediately when the yarn breaks, the sliver will wind around the roller and damage surrounding parts in a short time or the bottom roller. There is a risk of deformation. In conventional devices, if the thread breakage detector and clutch operating circuit fail or the clutch mechanism cannot be energized due to disconnection, the clutch remains connected and the supply of sliver is not stopped. There is a risk of damage to the machine. On the other hand, in the device of this invention, when the clutch mechanism is not energized due to a failure or disconnection of the circuit, that is, when the electromagnet 33 is not excited, the transmission gear 29 is connected to the brake member 3 by the coil spring 31.
Since the back bottom roller 19 is held in a state where it is engaged with zero and stops, there is no risk of damage to parts, etc., unlike conventional devices.

FIGS. 5a and 5b show characteristic diagrams of a conventional clutch in which the clutch is disconnected and a braking force is applied when energized, and a clutch according to the present invention in which the clutch is connected when energized. As is clear from this figure, when using electromagnets 33 with the same attractive force, in the conventional clutch, the braking force is significantly larger than the clutch force (transmitted torque of the clutch). The transmission torque required by the clutch, that is, the value of the clutch force, is set to a predetermined value based on the force that drafts the sliver, but when using the conventional clutch described above, when a predetermined clutch force is obtained, the braking force is reduced. becomes larger than necessary. On the other hand, in the case of the clutch mechanism of the present invention, even if only the braking force necessary for the cutting force when the sliver supply is stopped is applied, a sufficient force exceeding the predetermined value can be obtained as the clutch transmission force. It is possible to reduce the spring force and the power used by the electromagnet, and the device can be made more compact.

On the other hand, when splicing is performed using an automatic splicing machine, the timing of supplying the sliver is important, and the quality (length, thickness) of the spliced knot is greatly influenced by the timing of supplying the sliver. In order to maintain yarn quality above a certain level, it is necessary to control the joint length to a few centimeters or less, and to achieve this, it is necessary to suppress the variation in clutch connection time to a few millimeters. With the passive connection method using the return force of the spring, as with conventional clutches, it takes a long time to complete the connection by 50 mm, as shown by the broken line in Figure 6.
There was a timing difference of about sec. On the other hand, in the device of the present invention, since the clutch is positively connected by an electromagnet, the connection speed is increased and the variation is reduced, as shown by the solid line in FIG. 6, and yarn splicing can be performed well.
Furthermore, although it is necessary to change the splicing timing depending on the type of spun yarn, this can be easily handled by changing the excitation voltage of the electromagnet.

In the device of this embodiment, a meshing clutch with triangular teeth is used as the clutch mechanism, and the brake mechanism is also structured so that the triangular teeth mesh with each other, so even if gear grease gets on the clutch or brake mechanism, Transmission or disconnection of rotational force is carried out without any hindrance. In addition, the clutch mechanism, brake mechanism, gears, etc. are in case 20.
Since the clutch is housed within the clutch mechanism, it is possible to prevent fluff from accumulating on the clutch mechanism or gear portion and interfering with the transmission of driving force.

Note that this invention is not limited to the above embodiments, and for example, a plate spring may be used instead of the coil spring 31, the drive gear 27 may be provided for each spindle instead of common to the two spindles, or the brake member may be The shape, structure, etc. of each part may be arbitrarily changed without departing from the spirit of this invention, such as providing a brake shoe instead of the triangular tooth 30 and providing a friction member on the transmission gear 29 side instead of the triangular tooth 29b. is also possible.

Effects of the invention As detailed above, according to this invention, as a clutch and brake device that transmits and releases driving force to the back bottom roller, the brake side is pressed by a spring and the connection with the clutch side is made. When energized, the clutch is connected by the attractive force of the electromagnet and the back bottom roller is driven. Therefore, in the event of a failure or disconnection of the thread breakage detector, clutch, or brake operation circuit, the clutch is disconnected and the sliver is disconnected. To surely avoid the inconvenience that the sliver is fed despite yarn breakage and winds around the roller, leading to damage to the machine base, because the supply is stopped immediately or the sliver is not fed from the beginning. I can do it. Further, since a predetermined clutch transmission torque can be obtained even if the attractive force of the electromagnet is reduced, the device can be made more compact. Furthermore, since the clutch is actively connected by the attractive force of the electromagnet, the clutch connection speed becomes faster and the variation in connection time is reduced, and the quality of the joints when spliced by the automatic splicing machine is maintained at a constant level. It has the excellent effect of maintaining yarn quality and stabilizing it.

[Brief explanation of drawings]

1 to 6 show an embodiment embodying this invention, in which FIG. 1 is a sectional view of the main part, FIG. 2 is a partially omitted plan view, and FIG. 3 is a A-line enlarged sectional view, FIG. 4 is a BB-line enlarged sectional view of FIG. 2,
FIG. 5a is a characteristic diagram of the conventional clutch, FIG. 5b is a characteristic diagram of the clutch of the present invention, FIG. 6 is a diagram showing the speed change of the bottom roller when the clutch is engaged, and FIG. 7 is a diagram showing the conventional clutch. FIG. Back bottom roller drive shaft...15, Back bottom roller...19, Back bottom roller shaft...
19a, case...20, driven gear...25, gear...26, drive gear...27, triangular teeth as clutch mechanism...27a, 29a, transmission gear...
29, Brake member...30, Triangular tooth as an engaging part...29b, Coil spring...31, Electromagnet...
...33.

Claims (1)

[Scope of utility model registration request] A back crawler is arranged to be drivable for each spindle, and the side surface of the drive gear is driven by meshing with a gear provided on the back bottom roller drive shaft common to all spindles, and the side surface of the drive gear is rotatable coaxially with the drive gear and is rotatable in the axial direction. A clutch mechanism is provided between a side surface of a transmission gear which is movably supported on the back bottom roller shaft and meshes with a driven gear, and the other side of the transmission gear is engageable with a fixed brake member. an engaging portion is provided, and a spring is provided for biasing the transmission gear into a state where the engaging portion engages with the brake member, and the transmission gear is brought into a clutch connected state by resisting the biasing force of the spring when energized. A sliver feeding and stopping device for a roller draft device equipped with an electromagnet to hold the sliver.