JPS603413Y2 - belt tension device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a spring-type belt tension device for applying tension to the tension pulley in a belt tension device that applies tension to a belt using a tension pulley.

Conventionally, commonly used spring-type belt tension devices usually have a tension pulley at the upper end and a coil spring connected to the other end of the tension bar.
This is a method that automatically tensions the belt surface by transmitting a tensioning action to a tension pulley attached to the tension bar using the pushing force or tensile force of the spring.
In this method, since the coil spring is in direct contact with the tension bar, when the belt vibrates, the spring, the tension bar connected to it, and the pulley motor pulsate periodically as the belt vibrates. , there was a problem of hunting phenomenon.

The present invention improves the problems of conventional spring-type belt tension devices, and utilizes a fixed bolt and a nut-type cylindrical pressing body attached to the tip of the bolt, and is capable of attaching both of them. A coil spring is interposed and fixed between the positions, and the cylindrical pressing body is rotated and pushed upward by the torsional force and rebound force of the spring, and the pressing force automatically moves the tension bar and the tension pulley in contact with the belt. The present invention is characterized in that it provides a belt tensioning device that can be pressed.

Hereinafter, embodiments of the belt tension device of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a bolt having a threaded portion S at its tip, the base of which is fixed to the mounting base 4, and the bolt tip has a threaded groove on the inner circumferential surface that fits into the bolt threaded portion S. A nut type cylindrical pressing body 2 having a diameter S' is screwed onto the bolt 1 and is integrally attached.

Therefore, the cylindrical pressing body 2 can be moved in the left-right direction in the figure at any time by rotating along the thread S of the bolt 1.

On the other hand, between the cylindrical pressing body 2 and the mounting base 4, a coil spring 3 is fitted around the outer periphery of the bolt 1 as shown in the figure, and the tip of each spring 3 is connected to the cylindrical pressing body 2 and the mounting base 4. It is fixed at the locking parts 'l' and 'T' of the stand 4.

Next, the operation of applying tension to a belt using the belt tensioning device of the present invention will be described.

The present invention has a simple configuration as shown in Narukami, but as shown in FIG. 2, Boo'JPI, P2. When the belt B wound around P3 is pressed by the tension pulley 6 at the tip of the tension bar 5, the nut-type cylindrical pressing body 2 of the tension device is rotated in the direction in which the coil spring 3 is tightened or loosened. The spring 3 is brought into contact with the tension bar S and pressed while still having a torsional force.

On the other hand, when the belt B is stretched by the continuous driving force of the belt B and the contact part with the tension pulley 6 becomes relaxed, the torsional force of the spring 3 that has been tightened or loosened due to this loosened state. On the contrary, the cylindrical pressing body 2 acts in the direction of loosening or tightening as a rebound elasticity, presses the cylindrical pressing body 2 in the thrust direction at the locking part T, and the direction of loosening or tightening the cylindrical pressing body 2 along the bolt screw S. As the belt rotates, it moves toward the tip of the bolt 1, and the tip of the pressing body 2 presses the tension bar 5 to automatically tension the loosened belt B, thus maintaining an almost uniform belt tension at all times. can do.

As described above, the belt tension device of the present invention has a structure in which a nut-type cylindrical pressing body is attached to the tip of a fixed bolt with a coil spring in between, and the pressing body is rotated by the repulsive force of the spring. Unlike conventional tension devices that use springs connected and fixed to a tension bar, belt vibrations do not directly propagate pulsations to the spring tension bar, eliminating the hunting phenomenon caused by spring resonance and keeping the belt tension uniform at all times. Take advantage of what you can do.

In addition, as mentioned above, in this invention, a coil spring is inserted and inserted around the outer circumference of the bolt, so thrust is also given by the elastic repulsive force of the spring, and the cylindrical pressing body uses the repulsive force of the spring and presses the belt. The belt is moved to a balanced position by the resultant force of the reaction force when the belt is pressed and the thrust force due to the torsional force of the spring.Moreover, since most of the reaction force when the belt is pressed is borne by the repulsion force of the spring, the load on the threaded part is reduced. At the same time, the degree of freedom is increased in terms of selection of the pressure angle of the screw depending on the screw pitch, thereby making it possible to maintain uniform belt tension more widely.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a belt tension device according to the present invention, and FIG. 2 is a side view showing a drive mechanism to which the belt tension device according to the present invention is attached. 1... Bolt, 2... Cylindrical pressing body, 3
......Coil spring, 4...Mounting base, 5...Tension bar, 6...Tension pulley, S...Threaded part, S '・・・・・・
・Screw groove, B...Belt.

Claims (1)

[Scope of utility model registration request] A device that has a tension pulley at one end for applying tension to a wrapped belt, and which is pressed by the elastic force of a tension bar that is pressed by an elastic force from the other end, and has a threaded portion at the tip. The bolt base is fixed to the mounting base, and the cylindrical pressing body for pressing the tension bar, which has a threaded groove on the inner circumferential surface that fits into the bolt thread part, is screwed onto the bolt tip, and the tip is screwed into the bolt tip. The coil spring is fitted onto the outer periphery of the bolt by having both ends thereof fixed to locking portions in the opposing surfaces of the cylindrical pressing body and the mounting base, which are in contact with the tension bar. Belt tension device.