JPH0715784U - Draft device connection structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a connection structure of a draft roller, which enables stable driving of the bottom roller and is easy to assemble and maintain. [Structure] Adjacent draft roller drive shafts of a plurality of weights arranged in rows or draft roller drive shafts divided between a plurality of weights are connected by an elastic coupling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connecting structure of a draft device.

[0002]

[Prior art]

 Conventionally, a bottom roller in a drafting device for a spinning machine in which a large number of weights are installed in parallel is formed on a drive shaft provided for each span with 6 to 8 weights as one span, and the end portion of each adjacent drive shaft is formed. Were connected by a fixed shaft joint such as a sleeve coupling, and all weights were driven simultaneously by a power source provided at the machine base end.

However, in order to ensure the safety of work at the time of yarn joining due to doffing, yarn breakage, etc., and when opening the cradle for maintenance and inspection of the draft device, a bottom roller is provided for each weight. It is advantageous to be able to stop separately. Therefore, there is a draft device that rotatably supports each bottom roller on a drive shaft, provides a clutch between the drive shaft and the bottom roller, and transmits the rotation of the drive shaft to each bottom roller via the clutch. Has been developed.

In such a draft device, it is difficult to provide a large number of bottom rollers and clutches on one drive shaft, and the draft cradle has two weights as one unit. Since the drive shaft is divided for every two spindles of the roller, the number of couplings that connect each drive shaft also increases, and the assembly work is not easy. In the unlikely event that the shaft centers of the drive shafts do not match. If so, the rotation of the bottom roller becomes unstable, which not only makes noise but also may damage the shaft and the bearing.

[0005]

[Problems to be solved by the device]

 In view of the above-mentioned problems of the prior art, the present invention aims to provide a draft roller connecting structure which can not only stably drive the bottom roller but also facilitate the assembling and maintenance work. It is what

[0006]

[Means for Solving the Problems]

 Adjacent draft roller drive shafts of the plurality of weights arranged in a row or the draft roller drive shafts appropriately divided between the plurality of weights were connected by an elastic coupling.

[0007]

[Action]

 The rotation of the draft roller drive shaft is transmitted to the adjacent drive shaft via a coupling made of an elastic material. At this time, even if an angular error, a parallel error, and an axial gap error occur between the adjacent drive shafts, they are absorbed by the elastic deformation of the coupling, so the rotation of the draft roller becomes unstable, No damage to the shaft or bearing will occur. Along with this, a certain degree of tolerance occurs in the assembly accuracy of the draft roller drive shaft. Also, when exchanging the draft roller, the drive shaft is removed by removing the coupling.

[0008]

【Example】

 Examples will be described with reference to the drawings.

FIG. 1 shows a draft device 1 having a bottom roller according to an embodiment of the present invention. In the figure, the draft device 1 comprises four lines of a back roller pair 2, a third roller pair 3, a middle roller pair 4 mounted with an apron belt e, and a front roller pair 5, 6 is an air spinning nozzle, and 7 is a sliver. Guides 8 are capacitors.

Each top roller 2t, 3t, 4t, 5t of the draft device 1 is rotatably supported by a cradle 9, and the cradle 9 is supported by a support shaft 12 fixed to a frame 10 via a bracket 11. It is rotatably supported. Then, the cradle 9 is lowered to rotate the lever 13, and the hook 14 at the tip of the lever 13 is engaged with the hook roller 16 supported by the bracket 15 provided on the frame 10 to move the cradle 9 at that position. If fixed, the top rollers 2t, 3t, 4t, 5t are pressed against the bottom rollers 2b, 3b, 4b, 5b.

Of the bottom rollers, the bottom rollers 2b, 3b, 5b except the middle bottom roller 4b have substantially the same structure. Therefore, the front bottom roller 5b will be described below with reference to FIGS. 2 and 3.

In the figure, a front bottom roller 5b corresponds to a pair of front top rollers 5t, 5t supported by a common cradle 9, and one to two drive shafts are provided for the purpose of evenly distributing contact pressure. 5L is rotatably supported via a bearing 51. A clutch 60 is interposed between the front bottom roller 5b and the drive shaft 5L, and rotation of the drive shaft 5L is transmitted to the front bottom roller 5b via the clutch 60.

That is, the movable iron piece 63 is fixed to the flange portion 61 at the end portion of the front bottom roller 5b via the spring 62, and the housing 67 that rotatably supports the drive shaft 5L with the bearing 66 has an electromagnetic force. The coil 65 is fixed, and the clutch plate 64 to which the drive shaft 5L is fixed is interposed between the electromagnetic coil 65 and the movable iron piece 63. When the electromagnetic coil 65 is supplied with power and excited, the movable iron piece 63 is attracted to the electromagnetic coil 65 side against the urging force of the spring 62 by the attractive force generated between the electromagnetic coil 65 and the movable iron piece 63. Accordingly, the rotation of the drive shaft 5L is transmitted to the front bottom roller 5b via the clutch plate 64 and the movable iron piece 63, and the front bottom roller 5b is driven integrally with the drive shaft 5L.

The drive shaft 5L is rotatably supported by a housing 54 via bearings 53 at both ends 52, 52 having small step diameters, and the housing 54 is fixed to a machine frame via a bracket 55. 56 is a cover. A gear member 5G is fitted to the end portion 52.

The gear member 5G has a spur gear shape with a triangular tooth shape in the illustrated example, but the tooth shape may have a square shape or the like. The gear member 5G is fixed to the rotation of the drive shaft end 52 by a key 57, and is prevented from being pulled out by a washer 58. Further, the gear member 5G and the gear member 5G fixed to the end portion 52 of the adjacent drive shaft 5L paired with the gear member 5G are connected by a coupling 5C.

The coupling 5C is formed of, for example, a flexible elastic material such as urethane in the shape of an internal gear having the same number of teeth and tooth profile as the gear member 5G, and is strong enough to transmit drive. ing. Then, by inserting the gear members 5G from both sides of the coupling 5C and fixing the axial movement of the coupling 5C by the snap ring 59 as shown in FIG. 2, the adjacent drive shafts 5L, 5L are It is connected by a pair of gear members 5G, 5G and a coupling 5C. Further, when replacing the bottom roller 5b, the upper housing 54a is opened, and then the snap ring 59 is removed to slide the cup ring 5C in the axial direction without removing the other drive shaft 5L. Since it is possible to remove only the drive shaft 5L of the roller 5b, the bottom roller 5b can be easily replaced.

FIG. 4 shows a second embodiment of the present invention, and shows a gear member 3G and a coupling 3C for connecting the drive shaft 3L of the third bottom roller 3b of the draft device 1 shown in FIG. A similar coupling is provided on the drive shaft L of the back bottom roller 2b.

The third bottom roller 3b and the back bottom roller 2b need to transmit a larger torque than that of the front bottom roller 5b described above. In particular, since the third bottom roller 3b drives the middle bottom roller 4b by the timing belt B shown in FIG. 1, the end portion 32 of the drive shaft 3L cannot be reduced in diameter, and the gear member 3G and the coupling are accordingly reduced. The diameter of 3C is also large. However, since the size of the housing 34 is also restricted by the draft gauge, the machine base width, and the like, in such a situation, a space in which the coupling 5C can slide is provided in the housing 54 as in the first embodiment. Rather than providing it, it is advantageous to increase the size of the coupling and secure its strength.

Therefore, in the coupling 3C shown in FIG. 4, the split portion 30 is provided in a part of the coupling 3C, and the reinforcing member 3R capable of being split in half is provided around the coupling 3C. By preventing expansion during elastic deformation of 3C, the strength of the coupling 3C is secured.

When replacing the third bottom roller 3b or changing the timing belt B, the upper housing 34a of the housing 34 is opened, and then the reinforcing member 3R is removed in half, and the coupling 3C is further removed. The drive shaft 3L of the bottom roller 3b can be removed by removing the drive shaft 3L from the gear member 3G by opening the drive shaft 3L from the slit 30.

In each of the above-described embodiments, the bottom rollers 2b, 3b, 5b are rotatably provided on the drive shafts 2L, 3L, 5L, but the bottom roller may be formed integrally with the drive shaft. Or, add that it can be implemented even when fixed.

[0022]

[Effect of device]

 As described above, the connection structure of the draft roller of the present invention is such that the adjacent draft roller drive shafts of the plurality of weights arranged in rows or the draft roller drive shafts divided between the plurality of weights are coupled by the elastic material. Even if there is a discrepancy in the axis between the adjacent draft roller drive shafts, the drive is transmitted reliably and the draft roller can rotate stably. Since the assembly accuracy has a permissible range, assembly work becomes easy. Also, when replacing the draft roller, timing belt, etc., the drive shaft can be easily removed, so that the work can be performed quickly.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a draft device having a bottom roller according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX ′ of FIG.

FIG. 3 is a perspective view showing a first embodiment of the present invention.

FIG. 4 is a perspective view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Draft device 2b Back bottom roller 3b Third bottom roller 5b Front bottom roller 2L, 3L, 5L Drive shaft 3G, 5G Gear member 3C, 5C Coupling 3R Reinforcing member 32, 52 End part

Claims (1)

[Scope of utility model registration request] 1. A drafting device, characterized in that adjacent draft roller drive shafts of a plurality of weights arranged in rows or a draft roller drive shaft divided between a plurality of weights are connected by a coupling made of an elastic material. Connection structure.