JP3005587B1 - Belt tension adjustment mechanism - Google Patents

Abstract

A belt tension adjusting mechanism capable of easily adjusting a belt tension is provided. SOLUTION: A first reference member 30 fixed in a positional relationship with one pulley 1 and a second reference member 4 fixed to the first reference member and arranged below an intermediate portion of the belt that is stretched.
A pressing member 10 for pressing the belt against the second reference member with a predetermined pressing force, and a spacing adjusting member 20 for mounting the other pulley 2 and mounting the pulley 2 on the first reference member to adjust the spacing with one of the pulleys. And with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt tension adjusting mechanism, and more particularly to a belt tension adjusting mechanism capable of easily adjusting a belt tension without using a tension gauge, a ruler, or the like.

[0002]

2. Description of the Related Art In a printer device, for example, printing paper is stored in a paper storage unit, and is conveyed to a printing unit using a conveying unit to perform printing. The paper feed mechanism is used. In such a paper feed mechanism, the rotation of the motor is transmitted via a belt and used as a transport drive source for the paper feed mechanism. In this case, in order to realize stable paper conveyance, it is required to set the belt tension with high accuracy and uniformity. In this case, in terms of manufacturing the printer at low cost, the belt tension is required. The man-hours required for adjustment are an important factor. here,
The belt is made of, for example, Kevlar which has high tensile strength.

[0003]

However, the conventional method of adjusting the tension of the belt requires a tension gauge or a ruler for adjustment, and the adjustment man-hour (adjustment time) is large.

An object of the present invention is to provide a belt tension adjusting mechanism capable of easily adjusting the belt tension.

[0005]

According to the present invention, there is provided a belt tension adjusting mechanism for adjusting the tension of a belt stretched between one pulley and another pulley. A first reference member having a fixed positional relationship with the first reference member, a second reference member fixed to the first reference member, and disposed below an intermediate portion of the belt that has been bridged, and the belt with respect to the second reference member. It is characterized by comprising a pressing member for pressing with a predetermined pressing force, and an interval adjusting member that is mounted on the first reference member and that can adjust an interval between the one pulley and the other pulley.

With such various members provided, the position (height) at which the second reference member comes into contact with the belt in the optimal tension state is determined in advance by calculation, experiment, or the like. A reference member is set in advance. In this state, the belt is pressed against the second reference member by the pressing member with a predetermined pressing force, and the position immediately after the belt and the second reference member are separated is operated by operating the interval adjusting member. This position is regarded as the position of the optimal tension state, and the gap adjusting member is fixed to the first reference member. Therefore, the belt can be set to the optimum tension without using a tension gauge or a ruler.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A belt tension adjusting mechanism according to the present invention will be described below with reference to the illustrated embodiment. FIG. 1 is a front view of the overall configuration of the present embodiment, and FIG. 2 is a side view of a swing member for adjusting belt tension.

As shown in FIGS. 1 and 2, the belt tension adjusting mechanism BC includes a small-diameter timing pulley 1 as “one pulley”, a large-diameter timing pulley 2 as “the other pulley”, and a tensile strength. Belt 3 made of Kevlar or the like, a positioning plate 4 serving as a "second reference member", a pressing force generating unit 10 serving as a "pressing member" for generating a predetermined pressing force, and a pulley 1 A space adjusting unit 20 that is a “space adjusting member” that adjusts the space between the pulley 2 and finally achieves a constant value of the belt tension, and a housing (frame).
And a position reference portion 30 which is a “first reference member”.

The plate 4 is fixed to a frame 32 forming a part of the position reference section 30 and receives a pressing force of a pressing member 11 forming a pressing force generating section 10.

The pressing force generator 10 includes a pressing member 11 for pressing the timing belt 3, a coil spring 12 for pressing the pressing member 11 at a constant value, and a pressing member 1.
1 and a jig 13 which houses the coil spring 12 and is detachably attached to a frame 31 forming a part of the position reference portion 30 by a claw 13a.

The interval adjusting section 20 is a rectangular swing plate 2
1, a shaft 22 erected on the rocking plate 21 and rotatably mounting the pulley 2, and a shaft 23 rotatably supporting the rocking plate 21 on a frame 32 forming a part of a position reference portion 30.
And a screw 2 which is inserted into the guide elongated hole 24 formed in the upper part of the rocking plate 21 and is screwed and fixed after adjusting the belt tension.
5 is provided.

(1) Explanation of the principle of the present invention First, the principle of the present invention will be described. As a precondition, since the timing belt 3 is rich in tensile strength as described above,
It does not expand or contract even when pressed by the pressing member 11 or when the swing plate 21 is swung and pulled.

Under this precondition, the plate 4 is first positioned. That is, a belt tension for stable transmission of rotational force is obtained by calculation or experiment, and then, in order to realize this belt tension, how much the timing belt 3 bends is an appropriate value is determined by the amount of deflection. D is obtained (see FIG. 3A). The magnitude of the flexure amount D (for example, 3 mm) that achieves the optimum tension can be determined whether the pressing member 11 is pressed or the pressing member 11 is removed (not shown).
Since the timing belt 3 is rich in tensile strength, it has the same size (dimension).

That is, in FIGS. 3A and 3B, the interval adjusting section 20 is swung in the direction of arrow R, and immediately after the lower surface 3a of the timing belt 3 and the upper surface 4a of the plate 4 are separated, the optimum belt tension is set. Is assumed to be set to. Therefore, if the screw 25 of the interval adjusting unit 20 is screwed to the frame 32 at a position immediately after the lower surface 3a of the timing belt 3 is separated from the upper surface 4a of the plate 4 while being pressed by the pressing member 11, the belt The optimum tension can be secured.

(2) Description of Operation of the Embodiment Next, the operation of the embodiment will be described.

As shown in FIG. 1, the claws 13a of the jig 13
To fix the pressing force generator 10 to the frame 31. In this state, a predetermined position of the timing belt 3 is pressed against the plate 4 by the pressing member 11. At the time of this pressing, the pressing force becomes a constant value by the action of the coil spring 12. Next, the swing plate 21 of the interval adjusting section 20 is swung about the shaft 23 in the direction of arrow R. Then, the lower surface 3a of the timing belt 3 separates from the upper surface 4a of the plate 4 at a certain swing position (see FIG. 3B). At the timing immediately after the separation, the screw 25 is tightened, and the gap adjusting member 20 is fixed to the frame 32. In this case, the optimum belt tension can be adjusted for the reason described in the principle description.

After the above belt tension adjustment is completed, the tab 13
a is removed from the frame 31, and the pressing force generating unit 10 is removed from the apparatus main body (not shown).

In this embodiment, the case of the printer device has been described. However, it is needless to say that the present invention can be applied to a belt having high tensile strength.

[0019]

As described above, according to the present invention, when adjusting the belt tension, the adjuster does not need to use a tension gauge, a ruler, or the like, and can more quickly perform the adjustment with higher precision.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a side view of the swing member of the embodiment.

3A and 3B are diagrams illustrating the principle of the present invention, in which FIG. 3A is a diagram illustrating the relationship between the amount of deflection of the timing belt and the optimum tension;
(B) is a diagram for explaining a state immediately before the timing belt and the plate are separated.

[Explanation of symbols]

 BC belt tension adjusting mechanism 1 small-diameter pulley 2 large-diameter pulley 3 timing belt 4 plate (second reference member) 10 pressing force generator 11 pressing member 12 coil spring 13 jig 20 interval adjusting unit 21 rocking plate 22, 23 shaft 24 Slot 25 Screw 30 Position reference part (first reference member) 31, 32 Frame

Claims (6)

(57) [Claims] 1. A belt tension adjusting mechanism for adjusting a tension of a belt stretched between one pulley and another pulley, wherein the first reference member has a fixed positional relationship with the one pulley; A second reference member fixed to one reference member and arranged below the intermediate portion of the belt that is bridged; a pressing member that presses the belt against the second reference member with a predetermined pressing force; and the other pulley is attached. And a spacing adjustment member attached to the first reference member and capable of adjusting the spacing with the one pulley. 2. The distance adjusting member has one end side of the first adjusting member.
2. A swing member which is pivotally supported by a reference member and has a fixing means at the other end side which can be fixed to the first reference member according to the swing position. Belt tension adjustment mechanism. 3. The swinging member is constituted by a substantially rectangular plate-like member, and the fixing means is inserted into an elongated hole formed at one end side of the plate-like member and the first reference member through the elongated hole. 3. The belt tension adjusting mechanism according to claim 1, wherein the belt tension adjusting mechanism is formed by a screw to be screwed. 4. The belt tension adjusting mechanism according to claim 1, wherein said pressing member includes a coil spring as means for generating a predetermined pressing force. 5. The belt tension adjusting mechanism according to claim 1, wherein the pressing member is detachably attached to the first reference member. 6. A belt tension adjusting mechanism according to claim 1, wherein the belt tension adjusting mechanism is used for a paper feeding mechanism of a printer device.