JPH0851U - Belt type false twisting device - Google Patents

Abstract

(57) [Abstract] [Problem] The nip pressure of a yarn has a great influence on false twisting efficiency and yarn quality. Obtaining a proper belt indirect pressure is an important condition for obtaining a good quality processed yarn, but even when the contact pressure is set accurately in the conventional equipment, good false twisting is performed when the operation is actually started. Was not done. As a result of research, it has been found that maintaining a proper tension of a belt is as important as maintaining a constant contact pressure. Therefore, a projecting plate portion that reaches the belt traveling plane is extended from a member that supports a belt tensioning pulley, and a spring or a cylinder that urges the pulley to move in the tension direction of the belt is provided with the projecting plate portion in the traveling plane. It was provided over the fixed part in the running plane.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 This invention relates to a belt type false twisting device.

[0002]

[Prior art]

 As shown in FIG. 4, a yarn (Y) is nipped between two endless belts (B 1) and (B 2) that intersect and run in different directions, and a false twist is applied to the yarn (Y). Twisting devices are known.

In this type of false twisting device, the nip pressure of the yarn, that is, the contact pressure between the two belts has a great influence on the false twisting efficiency and the yarn quality, and therefore it is good to obtain an appropriate indirect belt pressure. This is an important condition for obtaining the textured yarn.

Therefore, various devices have been proposed in order to accurately adjust the indirect pressure of the belt (for example, JP-A-60-17125).

[0005]

[Problems to be solved by the device]

 However, even when the belt indirect pressure is precisely set using the apparatus disclosed in Japanese Patent Laid-Open No. 60-17125, when the operation is actually started, good false twist is often not applied.

Therefore, as a result of intensive research by the present inventor, although the above-described belt indirect pressure adjusting device can adjust the approaching pressure between the belts, the tension state of the endless belt itself causes stretching or deterioration of the belt. If the set contact pressure is the same, for example, when the tension of the belt itself is high, as shown in Fig. 5, the thread will be sandwiched between the rigid plate-shaped bands, but the tension is low. In this case, as shown in FIG. 6, the yarn is nipped so as to be wrapped at the intersections of the belts that bend and intersect, and the twist state given to the yarn due to the different contact mode of the belt to the yarn (Y). It turned out that they would be different.

That is, it has been found that maintaining the belt in a proper tension state is as important as maintaining a constant contact pressure. However, the conventional belt tensioning device is endless as shown in FIG. Since the slider (3) at the base end of the shaft (2) of the pulley (1) around which the belt (B) is suspended is biased by a spring (4), how much the slider (3) slides smoothly. By the way, for the load (that is, the tension load applied to the belt) to move the pulley (1) in the horizontal direction in Fig. 7, a hysteresis curve (Fig. 9) corresponding to the moving position of the pulley (1) is drawn. It was fluctuating, and it was not always possible to apply the exact same tension to the belt. In FIG. 7, (5) is a drive pulley and (6) is a drive shaft.

The present invention is based on the knowledge of the causal relationship between the belt tension state and the yarn quality, which was originated from the fine adjustment of the indirect belt pressure as described above. The present invention intends to provide a false twisting device capable of always maintaining a proper tension state, that is, a constant tension applying state.

[0009]

[Means for Solving the Problems]

 A belt type false twisting device according to the present invention is a belt type false twisting device for nipting a yarn between two endless belts that cross and run in different directions to perform false twisting. A pulley is movably provided in the traveling plane of the endless belt, a projecting plate portion reaching the traveling plane is extended from a member supporting the pulley, and a spring or a spring for urging the pulley to move in the tension direction of the belt is provided. The cylinder is provided over the projecting plate portion in the traveling plane and the fixed portion in the traveling plane.

[0010]

[Embodiment of device]

 Examples will be described below with reference to FIGS. 1 to 3, but in the examples shown in FIGS. 1 to 3, of the two endless belts (B1) and (B2), the entire endless belt is a drive shaft. The one about the endless belt (B1) that can be turned around (arrow A in FIG. 4) is the one, and the other endless belt (B2) is fixed to the base and cannot turn. Other than that, the structure is the same, and the description thereof is omitted.

That is, by pushing the endless belt (B1) on the turning side against the endless belt (B2) on the fixed side, the yarn (Y) is nipped between the belts (B1) and (B2). Therefore, a contact pressure applying device (described later) and a contact pressure reducing device (described later) as a contact pressure adjusting device are provided on the support mechanism side of the endless belt (B1). The endless belt tensioning device (described later) has the same structure for both belts (B1) and (B2).

1 to 3, a shaft (15) connected and fixed to a drive pulley (10) has a roller (17) at a lower end thereof which comes into contact with a running belt (16), and an upper and lower bearings (18). It is rotatably supported in the cylindrical body (19). The tubular body (19) is fixed in a bracket (20), and a driven pulley (11) is rotatably supported on an arm portion (21) extending from the bracket via a tension device described later. Has been done. Further, a ring (25) having three protrusions (22), (23) and (24) is fixed to the outer periphery of the lower portion of the tubular body (19) as shown in FIG. 3, and from the ring (25) to a bearing (26). ) (26) and is rotatably supported by the base (27). Therefore, the tubular body (19) and the arm portion (21) can rotate integrally with the base (27), and the shaft (15), that is, the drive pulley (10) can rotate with respect to the tubular body (19). It is free.

When the traveling belt (16) is driven by a device (not shown), the drive pulley (10) is rotated from the roller (17) via the shaft (15), and the endless belt (B1) is rotated. The driven pulley (11) rotates as the vehicle starts traveling. Further, inside the base (27), there are provided a contact pressure applying device (28), a contact pressure reducing device (29) and a belt separating device (30) shown in FIG.

The contact pressure applying device (28) is composed of an air cylinder, and the tip of the piston rod (28a) which is operated by the inflow of compressed air contacts the first protrusion (22) of the ring (25), The ring (25) is rotationally biased in the counterclockwise direction in FIG. 3, that is, the endless belt (B1) is rotated in the direction of arrow (A) in FIG.

The contact pressure reducing device (29) includes a screw body (31) screwed into the base (27), a rod-shaped pin (32) fixed to the screw body (31), and a second end. A cap (33) that abuts the protrusion (23) and is loosely fitted to the pin (32) at the other end, and is mounted around the pin (32) and separates the screw body (31) and the cap (33) from each other. And a spring (34) for urging the spring (34). The contact pressure reducing device (29) is provided in a direction orthogonal to the contact pressure applying device (28), and the ring (25) is rotated in the clockwise direction in FIG. 3 by the force of the spring (34), that is, in FIG. Rotate in the direction opposite to the arrow (A). By rotating the screw body (31), the apparent length of the spring (34) can be changed, and the biasing force on the ring (25) can be appropriately changed and adjusted.

The belt separating device (30) includes an operating lever (36) having a cam portion (35), and a working rod having one end contacting the third protrusion (24) and the other end contacting the cam portion (35). (37) and a spring (38) for urging the working rod (37) away from the third projection (24). This belt separating device (30) is mainly used when initially threading the belt type false twisting device, and the cam lever (36) is projected by turning the operation lever (36) lightly by hand. The part presses the working rod (37), the tip of the rod (37) contacts the third protrusion (24), and the ring (25) rotates clockwise in FIG. (B2) is maintained in a state of being separated from each other. During this time, the thread (Y) is passed between the belts (B1) and (B2), and the operation lever (36) is turned again to bring the thread (Y) into the nip state.

Next, the adjusting action of the belt indirect pressure in the belt type false twisting device will be described. Compressed air is constantly sent to the contact pressure imparting device (28) from a compressed air source (not shown), and the piston rod (28a) moves the arm portion (21) through the ring (25) and the tubular body (19). The belt is turned (direction of FIG. 4A) and a constant contact pressure is applied between the belts (B1) and (B2). On the other hand, the contact pressure reducing device (29) urges the arm portion (21) to rotate in the opposite direction to the above by the force of the spring (34), and the contact pressure applying device (28) applies the contact pressure. Plays a role in reducing

If the contact pressure reducing device (29) is not provided, only the repulsive force between the belts (B1) and (B2) resists the force of the contact pressure imparting device (28). Fluctuations of the compressed air sent to the pressure applying device (28) are transmitted as they are as vibrations of the belts (B1) and (B2) and adversely affect the processing conditions of the yarn (Y). Therefore, the contact pressure reducing device (29) absorbs and absorbs the vibrations of the belts (B1) and (B2) due to the fluctuation of the compressed air, and the resulting continuous change of the indirect pressure of the belt, and the processing conditions of the yarn (Y). With the function of maintaining stable.

Next, the tensioning device for the endless belts (B1) and (B2) will be described.

That is, in this example, the arm portion (21) extending from the bracket (20) is formed in a fork shape that is bifurcated in plan view, and the drive pulley is provided on the fork-shaped portion (41). A U-shaped frame portion (42) located between the (10) and the driven pulley (11) is formed, and fixed through the left and right walls (43) and (44) of the U-shaped frame portion (42). 45) A slider member (47), which is a mount for the driven pulley (11), is slidably supported in the left and right directions in FIGS. 1 and 2 on the guide shaft (46).

That is, on the one hand, the slider member (47) has the rotating shaft (48) of the driven pulley (11) rotatably erected via the bearing (49), and on the other hand, the tip end thereof is Projecting plate parts (51) (52) having a shape capable of protruding into the opening of the square frame part (42) are formed, and insertion holes (53) (54) formed in the projecting plate parts (51) (52). The guide shaft (46) is inserted into the arm portion (21) so as to be freely slidable.

Reference numeral (55) is a bush provided in the insertion holes (53) and (54) for reducing frictional resistance, and reference numeral (45) is a set screw.

The width of the portion (47a) located between the fork-shaped portions (41) of the slider member (47) is substantially equal to the interval (W) between the fork-shaped portions (41). It is designed so that the slider member (47) does not swing around the guide shaft (46), and thus the driven pulley (11) does not swing.

The position of the guide shaft (46) provided as described above is the same as the height of the endless belt (B1) suspended on both pulleys (10) and (11), In addition, it is laid horizontally so as to be included in a virtual plane including both pulleys (10) and (11), and between the wall (43) of the square frame portion (42) and the projecting plate portion (52). Further, a compression coil spring (56) whose elastic force is preset to a predetermined set value is interposed.

Therefore, the guide shaft (46) provided on the arm portion (21), the slider member (47) for supporting the driven pulley (11), and the coil spring (56) allow the tensioning device (57) to operate. It is configured.

The support structure for the endless belt (B1) is as described above, and the compression coil spring (56) extends to separate the drive pulley (10) and the driven pulley (11) from each other. Since the vector (F) of the pulling force acting in the direction is in the virtual plane including both the driving pulley (10) and the driven pulley (11) (preferably in the traveling plane of the endless belt (B1)). The acting force for moving the driven pulley (11) to the right in FIGS. 1 and 2 has no hysteresis, and the endless belt (B1) is always given a uniform tension.

Therefore, when the compression coil spring (56) is selected so that the elastic force is set to a predetermined value in advance, the endless belt (B1) is always strained with the predetermined value and used for a long time. When the endless belt (B1) is stretched by the driven pulley (11), the driven pulley (11) smoothly moves in the right direction in FIGS. 1 and 2 to absorb the stretched amount, and the endless belt (B1) is stretched. Keep the tension the same, eliminate slack, and always maintain the same tension.

When the endless belt (B1) is shortened by some condition, the driven pulley is reverse to the above. The pulley (11) moves leftward in FIGS. 1 and 2, but the tension is the same and the tension is the same. Keep

In the above example, the compression coil spring (56) is used as the elastic member as the belt tension source, but it goes without saying that a spring having another shape such as a tension spring may be used. An air cylinder that is always in contact with a constant pressure source may be used.

Further, in the above embodiment, the threaded portion (58) is formed on one end side of the guide shaft (46), and the nut plates (59) (60) are screwed onto the threaded portion (58), If a coil spring (56) is interposed between the nut portions (59) (60) and the projecting plate portion (52) of the slider member (47) (FIG. 8), the nut plate (59) is formed. ) By adjusting the position (60), it is possible to increase / decrease the substantial elastic force of the coil spring (56) to further increase the tension (tension) of the endless belts (B1) (B2). It becomes possible to precisely adjust to a desired value. Further, spacers having different thicknesses may be inserted between the coil spring (56) and the wall (43) instead of the nut plates (59) (60).

[0031]

[Effect of device]

 As is clear from the above description, the belt-type false twisting device according to the present invention provided good false twist results that cannot be expected only by the technique of adjusting the contact pressure between the belts. That is, the causal relationship between the belt tension state and the yarn quality was discovered, and based on this finding, the tension force applied to the endless belt was always constant regardless of the expansion and contraction of the belt. The yarn nip state does not fluctuate as described above due to the belt tension variation, and the yarn is always false-twisted in a good condition.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a support structure on one endless belt side of a belt type false twisting device according to the present invention.

FIG. 2 is a plan view corresponding to FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a perspective view showing an outline of a belt type false twisting device.

FIG. 5 is an explanatory diagram showing a thread nip state when the belt tension is high.

FIG. 6 is an explanatory diagram showing a thread nip state when the belt tension is low.

FIG. 7 is an explanatory diagram of a conventional device.

FIG. 8 is a partial vertical sectional view showing another embodiment of the belt tensioning device.

FIG. 9 is a graph of a hysteresis curve showing a change in load. 10 Drive Pulley 11 Driven Pulley 46 Guide Shaft 47 Slider Member 56 Compression Coil Spring 57 Tensioning Device F Stretching Force B1, B2 Endless Belt Y Thread

Claims (1)

[Scope of utility model registration request] 1. A belt type false twisting device for nipting a yarn between two endless belts that cross and run in mutually different directions to perform false twisting, in which a belt tensioning pulley runs the endless belt. Provided movably in a plane, extending a projecting plate portion reaching the traveling plane from a member supporting this pulley,
A belt-type false twisting device, wherein a spring or a cylinder for urging and moving the pulley in the tension direction of the belt is provided between a projecting plate portion in the traveling plane and a fixed portion in the traveling plane.