JP2717709B2 - Rolling cryls and roll unwinding device using a large number of the cryls - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for unwinding a thread, a tape or the like from a wound ball with a constant tension while rotating a wound ball such as a thread or a tape in the unwinding direction.

(Prior Art) Conventionally, in this kind of wound ball unwinding device, the unwinding tension gradually changes due to the decrease of the wound ball diameter as the unwinding progresses, so that the braking force acting on the spindle is gradually reduced. Means such as changing and adjusting, and performing feedback control on the feeding of thread and tape while detecting the tension with the dancer arm are performed.However, these means complicate the equipment and increase the equipment cost. When using the dancer arm of the above, the drawing path of thread, tape, etc. becomes complicated,
In addition, since the installation space becomes large, the arrangement of high density is limited, and when unwinding yarns, tapes, etc. from a dozen or hundreds of rolls at once, a huge installation space is required. there were. In order to eliminate this inconvenience, the present applicant has previously disclosed in Japanese Patent Application Laid-Open No. 60573/1988 that the ball is held at the front end of a spindle rotatably supported at the center by a ball bearing, and the rear end is supported by a friction bearing. By automatically adjusting the unwinding tension to a substantially constant value during unwinding in accordance with the balance between the weight of the ball and the load acting on the friction bearing, the unwinding tension is changed by changing the distance between the friction bearing and the fulcrum ball bearing. We have proposed a simple structure for unwinding a ball that can maintain the desired value.

(Problems to be Solved by the Invention) However, in the wound ball unwinding device according to the above proposal, since the distance between the ball bearing serving as a fulcrum and the center of gravity of the wound ball is invariable, the unwinding tension is changed only with the ball bearing. In addition to changing the distance between bearings, it is necessary to extend the spindle in the part that contacts the friction bearing in order to increase the tension adjustment range,
There is a problem in that an obstacle occurs when performing multi-stage multi-spindle arrangement.

(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned problems of the prior art, and to obtain a roll-up krill that can easily and accurately adjust the unwinding tension of a winding thread, a tape, or the like. The rolling krill supports the intermediate portion of a bobbin supporting member having a required length with a ball held at one end rotatably by a fulcrum ball bearing and the other end supported by a friction bearing, and supports the wound ball and bobbin. The position of the fulcrum ball bearing can be adjusted between the position of the center of gravity including the member and the friction bearing. Further, a large number of the above-mentioned rolling rills are multistagely arranged on the machine base as cantilever supports. A common display that displaces the fulcrum ball bearings of each rolling rill simultaneously by a single motor via interlocking means and changes the pointer position for a plurality of rolling rills by rotating the screw shaft. A vessel, The unwinding device is characterized in that the screw shaft of the indicator is rolled and each knurl is linked to the displacement of the fulcrum ball bearing.

(Operation) In the present invention, by changing the position of the fulcrum ball bearing, the distance from the fulcrum ball bearing to the position of the center of gravity of the whole including the wound ball and the bobbin support member and the distance from the fulcrum ball bearing to the friction bearing are reduced. It can be increased and decreased at the same time, and the amount of change in the unwinding tension with respect to the amount of movement of the fulcrum ball bearing can be increased. The operation principle will be described with reference to FIGS. 1 and 2.

The bobbin support member (1) is rotatably supported at its intermediate portion on a fulcrum ball bearing (4) mounted on a guide shaft (3) protruding horizontally from the machine base (2). The inner end is supported by a friction bearing (5) on a guide shaft (3), and the wound end (6) is held at the outer end. In the figure, 0 indicates the position of the center of gravity of the whole including the bobbin support member (1), the wound ball (6) held thereon, and the correction weight (7) attached to the support member (1). ) Are supported in equilibrium at the front and rear portions by a fulcrum ball bearing (4).

Here, r: inner radius of the outer race of the friction bearing (5) μ: friction coefficient of a contact portion of the friction bearing (5) l: distance between the fulcrum ball bearing (4) and the friction bearing (5) L: … Distance between the fulcrum ball bearing (4) and the position of the center of gravity 0 h: Width of the wound ball (6) Do: Minimum diameter of the wound ball (6) Dm: Outer diameter of the wound ball (6) Wo: Bobbin support members (including correction weights) (1)
Weight W: Weight of wound ball (6) containing Wo F: Radial force acting on friction bearing (5) T: Tension when thread, tape, etc. are pulled out from wound ball (6) ρ: … If the apparent density of the ball (6) is Is established.

From formulas (1), (2) and (3), the unwinding tension T is Becomes Now, in order to keep the unwinding tension as constant as possible irrespective of the wound ball, the minimum diameter of the wound ball is Do and the outer diameter is nDo.
And substituting it into equation (4), and assuming that the tension in each is equal, Is obtained. Here, n is a multiple of the maximum outer diameter of the wound ball to maintain the same tension and the outer diameter of the bobbin. That is, by substituting the value obtained by the above equation (5) into the equation (4) and selecting the dimensions of each part of the device, the friction coefficient of the friction bearing, and the like so as to satisfy this, the same unwinding is performed at the winding diameter Do and nDo Get tension.

In the above equation, when the ball bearing and the friction bearing are compared by the friction coefficient at the time of rotation, the former is only 1 to 3% of the latter value, and the braking force due to the spherical rain is calculated as negligible. Excluded from the element.

Further, in the present invention, since L and l simultaneously increase and decrease only by changing the position of the fulcrum ball bearing (4), the element L / L can be adjusted only by slightly moving and adjusting the fulcrum ball bearing as can be seen from equation (4).
Since l changes greatly, the adjustment range of the unwinding tension is greatly expanded.

Further, in the present invention, when a large number of rolling-up creels are arranged and used, the positions of the fulcrum ball bearings of each creel are simultaneously changed by a single motor via an interlocking mechanism, and the winding unwinding tension of each creel is changed. In this case, the positions of the fulcrum ball bearings of each krill are displayed on a common display, and the tension setting of each rolling krill can be read at a glance.

(Embodiment) An embodiment of a rolling krill according to the present invention will be described with reference to FIG.

(1) A bobbin support member (hereinafter referred to as a bobbin support tube) having a cylindrical shape, and a flange-shaped holder having a plurality of concave grooves (8) and (9) on the outer peripheral surface and the intermediate portion at one end thereof, respectively. Secure the supports (10) and (11), and hold the holder supports (1
A weight (7) having a predetermined weight was attached to the tip of a shaft piece (12) protruding from the center of (0) so as to be adjustable in position in the axial direction.

The holder plate (13) is fitted and held between the concave grooves (8) and (9) of both holder supports (10) and (11), and the outer periphery of the plurality of holder plates (13) is spring band (14). And hold the holder plate (13) on the bobbin support cylinder (1).
A ring cam (15) loosely fitted to the shaft piece (12) is spring-loaded into a tapered portion (13a) formed inside the front end of (3).
6), the plate (13) is pressed by the tapered surface (15a) of the ring cam (15) against the tapered surface (15a) of the ring cam (15). The outer diameters of the plurality of plates (13) that are pushed outward and are arranged in an annular shape are increased, and the bobbin (6a) of the rolled ball (6) fitted to the outer surface thereof is elastically held from the inner surface.
Reference numeral (2) denotes a fixed machine base, and a guide shaft (3) to be fixed by cantilever support is provided so as to protrude in a horizontal direction, and the guide shaft (3) is provided.
A fulcrum ball bearing (4) is mounted on a sleeve (17) that moves along the axis, the bobbin support cylinder (1) is inserted into the guide groove (3), and an inner middle portion thereof is fixed by the fulcrum ball bearing (4). The inner end of the bobbin support cylinder (1), which is rotatably supported and is integrally fixed to the housing (19), and the boss (20) of the machine base (2) to which the guide shaft (3) is fixed. It is rotatably supported by a friction bearing (5) provided between them.

The friction bearing (5) was composed of a spherical outer race (5a) provided on the housing (19) and a spherical inner race (5b) provided on the boss (20). Is applied.

(21) is a screw shaft provided rotatably through the boss portion (20), and the tip of the screw shaft is provided on a sleeve (17) provided movably with respect to the guide shaft (3) in the bobbin support cylinder (1). The sprocket wheel (22) is fixed to the projecting portion from the machine base (2) by screwing, and the axial movement is prevented by a bearing member (23) provided outside the machine base (2). Two
4) Sprocket (22) driven by screw shaft (2
By rotating 1), the sleeve (17) can be moved to displace the position of the fulcrum ball bearing (4).

Incidentally, the bobbin support cylinder (1) is an overall body including the center position of the wound ball (6) when the wound ball (6) is held on the outer periphery and each member that rotates integrally with the bobbin support cylinder (1). The weight of the weight (7) is set so that the position of the center of gravity matches.

Next, a description will be given of an embodiment in which a large number of the above-mentioned rolling creels are arranged and used as a multi-stage multi-spindle type with reference to FIG. 4 and FIG.

In the illustrated example, a case is shown in which a total of 20 cryls A are arranged on both sides of the machine frame (30), 10 in 2 rows and 5 tiers, but the number can be increased or decreased and the arrangement state is arbitrary.

Each krill A is arranged in a straight line along an inclined frame (31) constituting a machine frame (30) and is cantilevered, and is connected to an output shaft of a pulse motor (32) installed at a lower portion of the machine frame (30). By driving the endless chain (24) wound around the attached sprocket wheel (33) and the sprocket wheel (22) of each creel A, the helical shaft (21) of each creel A is rotated to drive each fulcrum ball bearing (4). ) Is moved along the guide shaft (3), and the movement position is displayed on the display (34).

As shown in FIG. 6, the display (34) is a cylinder (35) made of a transparent wall having a scale (36) on its outer surface that indicates the unwinding tension;
An index piece (37) that moves in the cylinder (35) in the length direction along the scale (36), and the cylinder (35) is fixed to the fixed support plate (38), and the index piece (37) Is attached to the support plate (38) so as to move along a guide shaft (39) which is fixed to the support plate (38) and protrudes into the cylinder (35), and includes a transparent cylinder (35).
A marker line (37a) was provided so that it could be viewed from outside.

The fixed support plate (38) is further rotatably supported by a screw shaft (40) in parallel with the guide shaft (39) so as to protrude into the cylinder (35).
A tip member is threaded through the index piece (37), and a sprocket wheel (41) is fixed to the base end of the screw shaft (40), and a support member () for preventing the screw shaft (40) from moving in the axial direction. Four
2) is provided, and the index piece (3) is turned by the rotation of the screw shaft (40).
7) moves along the guide shaft (39), and its movement position is determined by seeing the marker line (37a) of the indicator piece (37) from the outer surface of the cylinder (35), and the unwinding tension value by the scale (36) The rotation of the screw shaft (40) is linked to the chain (44) from the sprocket (43) attached to the output shaft of the pulse motor (32) installed at the bottom of the machine frame (30) as an interlocking mechanism. Is done.

FIG. 7 is a diagram showing the unwinding tension of the yarn in the present invention,
Rolled ball (6) having outer diameter Do = 80 mm, nDo = 175 mm, winding density ρ = 1 g / cm ³ , and winding width h = 250 mm, distance l between fulcrum ball bearing (4) and friction bearing (5) = The values of tension at each unwinding diameter when moved between 100 and 240 mm are shown.

(Effect of the Invention) According to the present invention, it is not necessary to perform the brake control of the spindle and the feedback operation of the yarn and the tape as in the conventional unwinding device, and the unwinding tension can be reduced by a simple means of pulling out the yarn and the tape. It can be pulled out while adjusting automatically,
It is possible to obtain a high-quality product as compared with a thread that is drawn out on a complicated path, and a large tension adjustment range can be obtained by only slightly changing the position of the fulcrum ball bearing. When a large number of balls are released simultaneously, the installation space can be reduced and a large number of rolling creels can be released simultaneously to change the release tension of a single motor, eliminating the need for individual adjustments. When the work efficiency is greatly improved and the release tension is always displayed on a single display, the installation management is easy, and the bobbin support member is made cylindrical and the fulcrum ball bearing is built in the cylindrical part. Has the effect of reducing the cost of the apparatus without the necessity of providing a separate cover, and being economically advantageous in terms of maintenance.

[Brief description of the drawings]

1 is a sectional side view showing the principle of operation of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a sectional side view showing an embodiment of a rolling krill, and FIG. FIG. 5 is a front view showing an embodiment of the winding yarn releasing device of FIG.
The figure is a partially cut-away side view showing an embodiment of the display, and FIG.
The figure is a diagram showing the relationship between the release tension and the winding diameter. (1) bobbin support member (support cylinder) (3) guide shaft (4) fulcrum ball bearing (5) friction bearing (6) wound ball (21) screw shaft , (30) ... Machine frame (34) ... Display, (43) ... Motor

Claims (2)

(57) [Claims] An intermediate portion of a bobbin supporting member having a required length and having a wound ball held at one end is rotatably supported by a fulcrum ball bearing, and the other end is supported by a friction bearing. A rolling krill characterized in that the position of the fulcrum ball bearing can be adjusted between the center of gravity including the center of gravity and the friction bearing. 2. A plurality of rolling krills according to claim 1 are arranged in a multistage manner on a machine base as cantilever supports, respectively, and a fulcrum ball bearing of each rolling krill is connected to one motor via interlocking means. A single indicator is provided for simultaneously changing the position of the pointer by rotating the screw shaft for a plurality of rolling creels, and the screw shaft of the indicator is rolled to displace the fulcrum ball bearing of the rill. A winding ball unwinding device characterized by being linked to.