JPH042691B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field This invention relates to a draft device for a spinning machine.

Prior Art In general, in spinning machines such as roving frames, spinning frames, and drawing machines, two or more sets of rollers with different surface speeds are installed, and the so-called roller draft system uses the difference in surface speed to sequentially thin the fiber bundle. Draft devices are widely used. Furthermore, in the case of a roving frame or a drawing machine, when the yarn breaks, the entire machine is stopped and the yarn splicing operation is carried out, which causes the disadvantage that the operating efficiency of the machine becomes poor. In addition, when the machine is stopped, the entire machine must be stopped instantaneously, so there is a problem in that a large-capacity brake is required. On the other hand, in a ring spinning machine, the fiber bundle is continuously fed without stopping even when the yarn breaks, and the fiber bundle is sucked up and discarded by the pneumatic suction until the operator completes the splicing, so the raw material is The disadvantage is that the loss is large.

The above-mentioned method of constantly supplying fiber bundles even during thread breakage and suctioning and discarding them with the new machine suction,
When applied to high-speed spinning machines such as binding spinning machines, which have made remarkable progress in recent years, not only will there be a large loss of raw materials and become uneconomical, but also when the new mass suction fails, the fiber bundle will be lost to the rotating part. wrapped around,
There is a problem that it may lead to accidents such as damage. In order to solve the above problem, Japanese Patent Publication No. 1210/1983 published on January 10, 1988 states that the back bottom roller can be driven and stopped for each spindle via a clutch,
An apparatus has been proposed in which the clutch is cut at the time of thread breakage to stop the cross roller, and the raw material fiber bundle is cut between the cross roller and the next downstream roller. However, when the drive of the back bottom roller is stopped by turning on and off the clutch, the back bottom roller does not stop immediately when the clutch is released, but instead rotates due to inertia, so the stopping time may vary depending on the type of fiber. No. When performing yarn splicing work using an automatic yarn splicing machine, it is necessary to accurately and reliably stop the supply of fiber bundles at a predetermined timing, so when the stop time of the back bottom roller is not constant as mentioned above. causes inconvenience. Furthermore, if the back roller is rotated due to resistance to pulling out the fibers after the clutch is released, the fibers may be pulled out and wound around the front roller, leading to an accident.

Purpose This invention was made in order to solve the above-mentioned conventional problems, and its purpose is to immediately stop the supply of the fiber bundle to the yarn cutting spindle when the yarn breaks, thereby eliminating loss of raw materials, and To provide a draft device for a spinning machine that can prevent accidents caused by fiber bundles being wound around rollers, and can reliably perform operations for supplying and stopping fiber bundles in a predetermined time in a timely manner.

Structure of the Invention In order to achieve the above-mentioned object, in this invention, a bat crawler is arranged so as to be drivable for each spindle,
A drive gear is driven by meshing with a gear provided on the back bottom roller drive shaft, and a driven gear is supported coaxially with the drive gear so as to be rotatable and movable in the axial direction, and is provided on the back bottom roller shaft. A clutch mechanism is provided between the transmission gear that transmits rotation,
The transmission gear is provided with an engaging member that can engage with a fixed brake member disposed on the opposite side of the clutch mechanism, and the transmission gear is biased by a spring to a state where the clutch is connected, and the transmission gear is energized. An electromagnet is provided to disconnect the clutch and attract and hold the transmission gear toward the brake member.

Embodiment Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. The draft part includes a front bottom roller 1, a middle bottom roller 2 around which an apron 2a is wound, a back bottom roller 3, a front top roller 4 which is pressed against each of the bottom rollers 1, 2, and 3, and an apron 5a around which the draft part is wound. As shown in FIG. 2, the front bottom roller 1 and the middle bottom roller 2 are made up of two spindles and are attached to both ends of the front bottom roller shaft 7 and the middle bottom roller shaft 8. Each is fixed. Gears 9 and 10 are fitted and fixed to the front bottom roller shaft 7 and the middle bottom roller shaft 8, respectively, and as shown in FIG.
1 and a middle bottom roller drive shaft 12, the rollers are constantly rotated via intermediate gears 13 and 14 driven by a middle and bottom roller drive shaft 12.

As shown in FIGS. 2 and 3, the back bottom roller shaft 15 is rotatably supported by a frame 17 via bearings 16, one spindle at a time.
A driven gear 18 is fixed to each back bottom roller shaft 15 so as to be rotatable therewith. 2 spindles 1
A drive gear 21 that meshes with a gear 20 fitted on a back bottom roller drive shaft 19 common to all spindles is rotatably supported by a shaft 22 in the center of the back roller set. The drive gear 21
On both sides of the
is installed protrudingly. A transmission gear 24 that transmits rotation to the driven gear 18 is supported on both sides of the drive gear 21 so as to be rotatable and movable in the axial direction. A pawl 25 that engages with a pawl 23 provided on the drive gear is protruded from one side of the transmission gear 24, and a pawl 25 that engages with a pawl 26 as a brake member fixed to the frame 17 is provided on the other side. A claw portion 27 is provided in a protruding manner. The transmission gear 24 has a support cylinder 24a into which the armature 28 is inserted and fixed.
and a coil spring 30 interposed between the retaining ring 29 and the retaining ring 29.
The pawls 23 and 25 of the dog clutch are biased into engagement with each other. Inside the claw flange 26, the clutch is disconnected when energized, and the transmission gear 24 is connected to the claw flange 26.
An electromagnet consisting of a field core 32 with a built-in coil 31 is provided to attract and hold it to the side. The coil 31 is energized based on a signal from a yarn breakage detector or an abnormality detector.

Next, the operation of the apparatus configured as described above will be explained. During normal spinning, the coil 31 is not energized, so the transmission gear 24 is biased toward the drive gear 21 and the clutch is held in a connected state, and rotated together with the drive gear 21, so that the back bottom roller 3 is rotationally driven via a driven gear 18. When the coil 31 is energized by the detection signal from the thread breakage detector or abnormality detector, the field core 3
2. A magnetic flux is generated between the armatures 28, and the armatures 28 and the transmission gear 24 are attracted and held together with the field core 32 side. As a result, the engagement clutch is released, and the claw portion 27 of the transmission gear 24 meshes with the claw flange 26, so that the transmission gear 24 is reliably stopped, and the back bottom roller shaft 1
5 and the back bottom roller 3 also stop. Since the front bottom roller 1 and the middle bottom roller 2 continue to rotate even after the back bottom roller 3 stops, the fiber bundle is cut between the middle bottom roller 2 and the back bottom roller 3 when the back bottom roller 3 stops. supply will be stopped. When the coil 31 is de-energized, the magnetic flux disappears, and the transmission gear 24 is moved toward the drive gear 21 by the spring force of the coil spring 30, and the pawls 23 and 25 engage, causing the transmission gear 24 to rotate together with the drive gear 21. The back bottom roller 3 is driven to rotate again via the driven gear 18. Since the clutch is held in the connected state by the spring force of the coil spring 30, unlike ordinary electromagnetic clutches, no electricity is used to maintain the clutch in the connected state, which helps reduce power consumption. Furthermore, since the power transmission mechanism is a gear mechanism, grease from the gears tends to adhere to the clutch mechanism or brake mechanism, but in the device of this embodiment, a dog clutch is used as the clutch mechanism, and the brake mechanism also has a pawl flange 26. Since it is configured in combination with the claw portion 27, even if grease is attached, the rotational force can be transmitted or the cutting action can be performed without any problem.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, a plate spring may be used instead of the coil spring 30, the drive gear 21 may be provided for each spindle instead of common to the two spindles, or a front bottom roller may be used. It is also possible to arbitrarily change the shape, structure, etc. of each part without departing from the spirit of the invention, such as configuring the roller 1 and the middle bottom roller 2 not in units of two spindles.

Effects As detailed above, according to the present invention, when yarn breaks, the back bottle roller with only the yarn breakage weight is immediately and reliably stopped based on the yarn breakage signal, so the supply of fiber bundles is also immediately stopped, and the binding and spinning process is stopped. When used in high-speed spinning machines such as spinning machines, it not only reduces raw material loss, but also allows the supply of fiber bundles to be immediately stopped in the event of a suction failure in the new mass suction. There is no chance of the wire getting wrapped around the wire and causing major trouble. In addition, by not only disengaging the clutch but also applying the brake, the rotation of the back bottom roller is reliably stopped, so the back bottom roller does not rotate along with the fiber due to the resistance of pulling out the fibers, and the fiber bundle feeding and stopping operations can be performed. This process is reliably carried out within a predetermined period of time, and the timing can be easily set, making it easy to perform yarn splicing work using an automatic machine. In addition, the clutch is connected to the drive gear during spinning using a spring,
Since the electromagnet is energized only when stopped to disengage the clutch and attract and hold the transmission gear on the brake side, the clutch brake mechanism is compact and the power consumption is reduced, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an embodiment embodying the present invention, FIG. 2 is a partially cutaway plan view of the main part, and FIG. 3 is an enlarged sectional view of the main part. Back bottom roller...3, Back bottom roller shaft...15, Driven gear...18, Back bottom roller drive shaft...19, Drive gear...21, Pawl as clutch mechanism...23, 25, Transmission gear...
...24. Flange with claws as a brake member...
…26, claw portion as an engaging member…27, coil spring…30, coil…31, field core…32.

Claims (1)

[Scope of Claims] 1. A drive gear 21 in which the back rollers 3 and 6 are arranged so as to be driven one spindle at a time, and is driven by meshing with a gear provided on a back bottom roller drive shaft 19; A transmission gear 2 is coaxially supported to be rotatable and movable in the axial direction, and transmits rotation to a driven gear 18 provided on the back bottom roller shaft 15.
4, and the transmission gear is provided with an engaging member 27 that can engage with a fixed brake member 26 disposed on the opposite side of the clutch mechanisms 23, 25. Electromagnets 31 and 32 are provided which bias the transmission gear 24 to a state in which the clutch is connected by a spring 30, disconnect the clutch when energized, and hold the transmission gear 24 by suction toward the brake member 26 side. A spinning machine draft device featuring: 2. The back crawlers 3 and 6 are composed of a set of two spindles, and the drive gear 21 is disposed in the center thereof, and clutch mechanisms 23 and 25 are provided on both sides thereof. 1st
The draft device of the spinning machine described in . 3. The clutch mechanism is a dog clutch, and the brake member and the engaging member are also flanges with claws.
The draft device of the spinning machine described in .