JPS6129209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tightener that adjusts the tension of a turntable drive wire in response to tension fluctuations in the wire.

For example, in order to lay the filament on the seabed, the filament is wound around a turntable in a laying ship, but in this case, if the load on the turntable becomes large, a large rotational force is applied to the turntable. is necessary. Therefore, it is necessary to increase the tension of the wire, and if a cushion is to be attached to the wire, an extremely large compression spring is required, resulting in high material costs and troublesome assembly.

An object of the present invention is to provide a turntable drive wire tightener that can apply a large tensile force and cushion to the wire with a small spring.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows a turntable drive device 10, with a drive capstan 16 between a turntable 12 and a drive capstan 16 driven by a motor 14. A wire 18 is stretched over the wire 18.
The tension is adjusted by the tightener 20 of the present invention, which will be described later.

The tightener 20 of the present invention is shown in detail in FIGS. 3-7. The tightener 20 includes a rotary bed 26 rotatably supported on a fixed bed 22 by a central shaft 24, and a slide bed 30 slidably supported on the rotary bed along a pair of guide members 28, 28'. It is equipped with A slide bed position adjustment mechanism 32 for adjusting the position of the slide bed 30 consists of an adjustment screw 34 screwed into the end surface of the slide bed 30, and a handle 36 is attached to the outer end 34a of the adjustment screw.
In addition, reference numeral 38 in the figure indicates that the adjustment screw 34 is connected to the rotating bed 2.
This is a bearing that supports 6. Therefore, the handle 36
By turning the slide bed 30, the slide bed 30 can be slid along the guide members 28, 28'.

A wire sheave 40 that engages with the inside of the wire 18 in FIG. A sheave displacement mechanism 4 for displacing this wire sheave 40 in the vertical direction of the slide bed 30 is fixed to a movable plate 44 that can slide in the vertical direction.
6 consists of a pair of upper and lower arms 48 whose one end is fixed to the central shaft 42, and a link mechanism 50 consisting of four links 50A, 50B, 50C, and 50D combined in a pantoglass shape. Link mechanism 5
The first hinge 52 of No. 0 is a fixed hinge supported by a bracket 54 on the slide bed 30, and the second hinge 52' is a movable hinge supported on a guide shaft 56 so as to be freely slidable. The guide shaft 56 is fixed on the slide bed 30 with a bracket 58, as shown in FIG. The third and fourth hinges 60 and 60' connecting the links 50A and 50C and 50B and 50D of the link mechanism 50 are movable hinges that are slidably supported by a rod 62 that is arranged on a line connecting these hinges. around this rod 62 are compression springs 64, 64', respectively.
are arranged, and their inner ends are movable hinges 60, 60'
The outer end engages with the spring receiver 66, 66' fixed to the rod 62, and the outer end engages with the adjustable spring receiver 68, 68'(68' is omitted) whose position can be adjusted by screwing into the threaded portion of the outer end of the rod 62. are doing.

Next, the operation of the tightener 20 of the present invention is shown in FIG.
To explain with reference to FIGS. 8A, B and FIG. 9, the wire sheep 40 and the sheave displacement mechanism 46
is mounted on the rotating bed 26 which rotates around the central axis 24 of the fixed bed 22, so when the wire 18 is hung on the wire sheave 40, the first and second linkages 50 are moved by the action of the compression springs 64, 64'. The turntable 12 is automatically rotated so that the line connecting the hinges 52, 52' is on the line connecting the center point with the wire sheave 20. If the wire 18 is slack, the compression spring 6
4,64' by the third and fourth hinges 60,6
0' are pushed toward each other, the linkage 50 closes so that the second hinge 52' separates from the first hinge 52, and the wire sheave 40 moves to the right as shown in FIG. 8A. to apply tension to the wire 18. Conversely, if the wire 18 is tensioned, the wire sheave 4
0 is pulled to the left as shown in FIG.
It spreads against 2'. The slide bed position adjustment mechanism 32 is for adjusting the position of the wire sheave 40 and the sheave displacement mechanism 46 by moving the slide bed so that the link mechanism 50 is in a position close to the closed position as shown in FIG. 8A. . Setting the wire sheave 40 and sheave displacement mechanism 46 in such a position is advantageous for the following reasons. That is, as shown in FIG. 9, the compressive force of the compression springs 64 and 64' is F, the longitudinal force of the links 50A to 50D is P', and the force between these links and the first and second hinges 5 is
If the angle between the line connecting 2 and 52' is θ, and the tensile force that pulls the wire sheave 40 is P, then P'=F/2sinθ...(1) Also, P/2=P'cosθ...( 2), and P=F/tanθ holds from equations (1) and (2). Therefore, if θ is small, that is, if link mechanism 50 is closed as shown in FIG. 8A, P will be large. This means that even with a small spring compression force F, a predetermined tensile force P can be obtained by reducing θ.

According to the present invention, as described above, the wire sheave is made up of a pantograph-like link mechanism provided between a fixed hinge and a movable hinge, and a spring that biases the link mechanism to close. Since it is equipped with a pulling sheave displacement mechanism, a large tensile force can be obtained with a small spring force, and therefore it can be easily assembled with a small spring, and the spring that closes the link mechanism acts as a cushion. This automatically prevents a decrease in rotational force due to wire elongation that occurs while driving the turntable.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the turntable driving device, FIGS. 2 and 3 are a plan view and a vertical sectional view of the main parts of the tightener of the present invention, and FIGS. 4 and 5 are diagrams of the slide head position adjustment mechanism. Plan view and vertical cross-sectional view, Figure 6 is a cross-sectional view taken along line A--A in Figure 5, Figure 7 is
The figure is a sectional view taken along the line BB in FIG. 2, FIGS. 8A and 8B are explanatory diagrams of the operation of the tightener of the present invention, and FIG. 9 is an explanatory diagram showing the force relationship of the tightener of the present invention. 12... Turntable, 16... Drive capstan, 18... Wire, 20... Tightener, 40... Wire sheave, 46... Sheave displacement mechanism, 50... Pantograph-like link mechanism,
52, 52'...first and second hinges, 60, 6
0'...Third and fourth hinges, 64, 64'...Springs.

Claims (1)

[Claims] 1. A wire sheave that engages inside a wire stretched between a turntable and a drive capstan, and a line that connects the wire sheave to the center point of the turntable and the wire sheave according to changes in the tension of the wire. In the turntable drive wire tightener, the sheave displacement mechanism is configured such that a first hinge is fixed and the wire sheave is attached to a second hinge opposite to the first hinge. a pantograph-shaped link mechanism connected to each other, and the first and second hinges are arranged on a line connecting the center points of the turntable and the wire sheave;
A tightener for a turntable drive wire, characterized in that the tightener comprises a spring that urges the other opposing third and fourth hinges of the link mechanism to approach each other.