JPH04164784A - Delivery device for coiled material - Google Patents

Abstract

PURPOSE:To reduce tension in drawing out a coiled material from a bobbin via the application of a simple mechanism by causing an arm to turn the bobbin via a one-way clutch in a direction for drawing out the coiled material, and making the effective length of the arm larger than the outer diameter of the coiled material wound around the bobbin. CONSTITUTION:A bobbin 2 having a coiled material 1 wound thereabout is so fitted to a shaft 4 with fasteners 3a and 3b as to be freely detachable, and the shaft 4 is so held on a retaining section 6 as to be freely rotatable via bearings 5a and 5b. One-way clutch 7 is provided on the shaft 4 and an arm 9 having a coiled material guide 8 is connected to one end of the clutch 7. The arm 9 is kept at a reset position with a spring 10, when the coiled material 1 is not being drawn out. In addition, the effective length of the arm 9 from the rotational center thereof is made larger than the outer diameter of the coiled material 1 wound around a bobbin 2. As a result, a pulling force for drawing out the first coiled material 1 may be less than a force in the case where the arm 9 is not fitted. According to the aforesaid construction, tension in drawing out the coiled material 1 from the bobbin 2 can be reduced with a simple mechanism.

Description

[Detailed description of the invention] [Industrial application field]

This invention relates to a device for feeding out a winding material (hereinafter referred to as a bobbin) wound with a windable material (hereinafter referred to as a winding material) such as a wire rod, paper, film, thin plate, etc.
In particular, the present invention relates to a winding material feeding device that is suitable for pulling out winding material (simply referred to as "drawing") using automatic equipment or the like.

[Conventional technology]

When drawing material from a bobbin, the tension tends to be maximum during the first drawing. This is due to the inertia of the bobbin. If the maximum tension is large, it will have an adverse effect on the rolled material, and the drawing force (maximum drawing capacity) of the drawing device must be increased, which is disadvantageous in terms of waste-free design. For this reason, techniques for lowering the maximum tension applied to the winding material and the pull-out device have become a common issue when drawing out (or feeding out) various winding materials. An embodiment of the winding material feeding device according to the present invention will be described below using an electric wire as a representative example of the winding material, but it can be similarly applied to winding materials other than wire rods. Traditionally, when pulling out a large amount of coated wire wound around a bobbin using automatic equipment, such as an automatic wire printing device, it has been necessary to use a tension adjustment device with a complicated mechanism or to feed the wire using opposing belt-like rotating bodies. A wire feeding mechanism such as a device is used. This is because sudden changes in tension and local drive when the wire is pulled out from the bobbin can damage the sheathing of the wire, stretch the core of the wire, and make it impossible for the specified current to flow, which can have negative effects on the wire itself. It is. Furthermore, if a sudden change in tension is caused to the pull-out mechanism inside the printing device, the pull-out step motor may lock, causing the pull-out mechanism to malfunction. One way to reduce the tension when pulling out the wire is to pull the wire out from the side of the bobbin without rotating the bobbin.
In this case, the wires are kinked, resulting in inconveniences such as the wires being splintered during the next step, for example, during winding up after printing, and stress remaining on the wires. For this reason, a wire feeding mechanism with a complicated mechanism has become an essential device for performing good printing on wires.

[Problem to be solved by the invention]

However, when these conventional wire feeding mechanisms are used, there is a problem that it is difficult to downsize the mechanism. Particularly when trying to handle many types of wires at the same time, the feeding mechanism alone takes up most of the equipment. Furthermore, if a single feed-out mechanism is to handle many types of wires, the complicated work of routing them to the feed-out mechanism must be repeated each time the wires are changed. For this reason,
When printing a small amount of various types of electric wires, most of the entire work is required to replace the electric wires. In order to eliminate the above-mentioned drawbacks, it is possible to use a winding material feeding device that has a simple mechanism and can reduce the influence of the inertia of the bobbin, but no device has been provided for this purpose. As a similar technology, a welding wire drawing device was developed in Utility Model Publication No. 51-4036 for the purpose of drawing out welding wire from a bobbin with a weak drawing force and stably feeding the wire.
It is disclosed in Publication No. 3. Its structure is shown in FIG. In detail, a rotary shaft 110 with a brake drum 114 that rotates together with the bobbin 1O2 is rotatably supported on a base 108, one end of a belt-type brake shoe 113 in contact with the brake drum 114 is fixed to the base 108, and the other end is used as a brake. It is fixed to the arm 111. brake arm 11
1 swings about a support shaft 112 provided on the base 108, and supports a weight 115 at the other end. The position of the weight 115 can be adjusted on the brake arm 111, thereby providing a brake mechanism with variable braking force. Further, a swinging arm 106 having a swinging guide roller 105 at its tip and swinging about a support shaft 104 is provided, and furthermore, the swinging arm 106 has a locking pawl 1 for opening the brake mechanism.
16, and the base 108 is provided with a stopper 117 for the swing arm 106 and a fixed guide roller 103. 101 is a welding wire. With this device, the force required to move only the arm is sufficient for the first draw, resulting in an extremely light pull-out force, but when the bobbin starts rotating, the bobbin is almost at a standstill, so a large tension is generated due to inertia. However, it has little effect in reducing the maximum tension on the rolled material, and its main effect is to reduce the tension at the beginning of pulling by the drawing device. Therefore, although it can be used for devices that use relatively strong wire materials such as welding wires, it is less effective for materials that are easily damaged by tension, such as electric wires. This is especially noticeable when using thin wires,
When a large amount of wire is wound and heavy, there is only a little wire left,
It becomes more noticeable when the apparent diameter of the bobbin becomes smaller or when the withdrawal speed is faster. In addition, the tension of the winding material is adjusted by returning the arm, but since the returning force is due to gravity, the closer the angle of the arm is to vertical, the slower the reaction, and there is a risk that the tension of the winding material will not be adjusted properly. be. In addition to the above-mentioned drawbacks, the present invention uses a simple mechanism to reduce the tension when pulling out the winding material from the bobbin, has a compact shape that allows for multiple installations, and increases the drawing speed. Another object of the present invention is to provide a winding material feeding device that can provide a tension reducing effect even if the apparent diameter of the bobbin is reduced.

[Means to solve the problem]

In order to achieve the above object, the winding material feeding device of the present invention takes the following measures. Namely, in the device that feeds out the winding material from the bobbin on which the winding material is wound, the shaft on which the bobbin can be fixed is rotated freely. a one-way clutch provided on the shaft and transmitting rotational force only in the rewinding direction of the bobbin; one end connected to the one-way clutch;
The arm has a winding material guide at the other end and rotates the one-sided clutch in the transmission direction by the winding material pulled out through the winding material guide, and a spring returns the arm to the non-transmission direction of the one-sided clutch. According to claim 2, the effective length from the center of rotation of the arm is longer than the outer diameter length of the material wound around the bobbin, A brake mechanism is provided that operates in a direction that releases the rotation of the shaft by means of an arm when the one-sided clutch rotates in the transmission direction.

[Effect]

With the above configuration, the arm rotates the bobbin in the direction in which the winding material is pulled out via the one-sided clutch before or at the same time as the bobbin starts to rotate directly due to the winding material being pulled out. Next, when the rotational speed of the bobbin becomes faster than the rotational speed due to the force from the one-sided clutch, the tension of the winding material decreases, and the arm moves in the return direction by the spring and becomes stable. At this time, the effective length of the arm is larger than the outer diameter of the material wound on the bobbin, so the initial rotational force of the bobbin due to the arm is:
Compared to the initial rotational force of the bobbin due to only pulling out the winding material,
It becomes small because the rotational moment is large. Therefore,
The pulling force required to pull out the roll material for the first time may be smaller than when there is no arm. (However, if the spring is not too strong) Also, after the bobbin reaches a certain rotation speed, the tension of the winding material is adjusted by the spring and the arm. In the second aspect of the present invention, the shaft is released from the brake mechanism when the arm rotates the bobbin in the winding material withdrawal direction, and the shaft is braked by the brake mechanism when the arm returns.

[Embodiment] Next, an embodiment of the winding material feeding device according to the present invention will be described with reference to the drawings. Fig. 1 shows the front view, and Fig. 2 shows the side view. Bobbin 2 on which winding material l (wire rod in the figure) is wound
is removably fixed to the shaft 4 by fastening tools 3a and 3b, and the shaft 4 is rotatably held in the holding part 6 by bearings 5λ and 5b. A one-way clutch 7 is provided on the shaft 4, and the rotation of the one-way clutch 7 is transmitted only in the direction in which the winding material L is pulled out from the bobbin 2 (in the six directions of arrows), and in the opposite direction. is not transmitted. An arm 9 having a winding material guide 8 (pulley in the figure) at the end is attached to the one-way clutch 7, and when the winding material l is not pulled out, a spring IO is applied to the return position (see FIG. 1). C). (A stopper may be provided in the middle.) With this configuration, the winding material l can be pulled out (
At the same time or before the bobbin 2 starts to rotate (depending on conditions such as the mass of the bobbin), the arm 9 rotates from C to E direction. This rotational force is transmitted from the one-sided clutch 7 to the shaft 4, causing the bobbin 2 to rotate in the direction of arrow A. The rotational force exerted by the arm 9 at this time increases as the effective length of the arm 9 (the length in the radial direction from the center of rotation of the shaft 4 to the winding material, indicated by X in FIG. 1) increases. Moreover, if the winding material pull-out direction is set as shown in the figure using the fixed pulley 11 or the like, the rotational force (torque) will be further increased. The strength of the spring IO needs to be at least strong enough to return the arm 9, but a weaker one is preferable in order to reduce the initial force of pulling out the roll material 1. It is necessary to have the strength to properly tension the
The strength of the spring may be adjustable. For the one-way clutch 7, various known mechanisms such as a ratchet type may be used. In claim 2, the brake mechanism 12 is essential. This brake mechanism 12 shows an example, and the shaft 4
a brake drum 13 fixed to and rotating together with the shaft 4;
Brake shoe 14 and brake shoe 1 that brake this
4 and a coupling mechanism 15 that connects the arm 9. When the arm 9 returns, the shaft 4 is braked, and when the arm 9 rotates, the shaft 4 is released. For example, when the arm 9 rotates from C to D, the coupling mechanism 15 connects the brake shoe fixing part 1 via the coupling mechanism fixing part 16.
The brake shoe 14, whose one end is fixed by the lever 7, is separated from the brake drum 13, and the brake mechanism 12 is released from the shaft 4. The brake mechanism 12 configured in this manner stops the rotation of the bobbin 2 when the arm 9 returns. As a result, when the winding material 1 stops being pulled out, the bobbin 2 continues to rotate due to inertia, and the winding material 1 rotates in the direction of the winding material guide 8, or at the same time, due to the play interval of the one-way clutch 7, the brake is applied. It is necessary to adjust the shoe to separate it from the brake drum 13. The roll material feeding device according to the present invention described above is merely an example, and modifications in details may be effective as necessary. For example, providing a spring mechanism in the arm itself, fixing the fixed pulley with a spring, using a coaxial type return spring, using multiple springs to change the strength of the spring in stages according to the angle of the arm, The length can be adjusted, the fixed pulley, the material guide can be rotated horizontally, the brake mechanism is a disc brake type, the shaft has an appropriate amount of friction, and the bobbin has a constant rotation speed. Many modifications can be made without departing from the spirit, such as providing a mechanism to brake when the number exceeds the number, or installing the holding part in the axial direction and attaching it to a wall. In addition, in order to apply the present invention to rolled materials (paper, film, plate-like materials, etc.), it is preferable to install arms at both ends, make the material guide rod-shaped, and connect the arms at both ends.

[Invention Q effect]

As explained above, according to the present invention, there are at least the following effects. (a) Since the initial rotation of the bobbin is performed not only by pulling out the winding material but also by rotating the arm, the force required to pull out the winding material from a stopped bobbin can be reduced. As a result, the maximum tension applied to the winding material can be reduced, and it can be applied to winding materials that are easy to break. Further, after the bobbin has rotated, the tension of the winding material can be adjusted. (b) Since no other drive device is required when feeding out the roll material, it is possible to downsize and facilitate simultaneous installation of multiple devices. (c) When feeding the winding material, since the structure is simple, there is no need for complicated winding material routing, and the bobbin can be replaced in a short time. (d) Since the load on the drawer device can be reduced, malfunctions of the drawer mechanism can be reduced, and the power device required for the drawer can be made smaller. (E) Even if the initial withdrawal speed is high, the arm rotates at a correspondingly high speed, so there is an effect of reducing the maximum tension. This simplifies the mechanism for temporarily adjusting the start-up speed of the drawer, and since high-speed drawing is possible, the work time can be shortened. This eliminates the need for the drawer device to include a mechanism for adjusting the drawer tension depending on the remaining amount of the rolled material. In addition to the above, the second aspect has at least the following effects. (g) Since the rotation of the shaft is braked by the return of the arm,
Looseness of the winding material can be minimized. FIG. 1 is an explanatory front view showing one embodiment of the winding material feeding device according to the present invention, FIG. 2 is an explanatory side view of the same,
FIG. 3 is an explanatory diagram of a conventional welding wire core-out device. 1: Winding material 2: Bobbin 3a, 3b: Tightening tool 4: Shaft 5a, 5b: Bearing 6: Holding part 7: One-way clutch 8: Winding material guide 9: Arm 10 Spring 11
:Fixed pulley 12 Nibrake mechanism 13 = Brake drum 14 Nibrake shoe 15 = Connection mechanism 16:
Connection mechanism fixing part 17: Brake shoe fixing part diagram

Claims (2)

[Claims] (1) In a device that feeds out a winding material from a bobbin on which a winding material is wound, a holding part rotatably holds a shaft to which the bobbin can be fixed, and a holding part is provided on the shaft and rotates only in the direction of unwinding the bobbin. A one-way clutch that transmits rotational force, one end connected to this one-way clutch, and a winding material guide at the other end,
It is composed of an arm that rotates the one-way clutch in the transmission direction by the winding material pulled out through the winding material guide, and a spring that returns the arm to the non-transmission direction of the one-way clutch. A winding material feeding device characterized in that the length is longer than the outer diameter length of the winding material wound on a bobbin. (2) The roll material feeding device according to claim 1, further comprising a brake mechanism provided on the shaft so that the arm operates in a direction to release rotation of the shaft when the arm rotates in the transmission direction of the one-way clutch.