JPH0439444A - Method for using toothed belt - Google Patents

Abstract

PURPOSE:To substantially suppress fluctuation of a speed in transmission of drive power by meshing toothed belts by using a plurality of the toothed belts such that a tooth is shifted from each other by each half tooth pitch. CONSTITUTION:A plurality of toothed belts 7, 8 are used by shifting a tooth mutually by each half tooth pitch. In this way, fluctuation of a speed, periodically repeated in each 1 tooth pitch (d) generated in the toothed belts 7, 8, is canceled each other between a plurality of the toothed belts 7, 8 such as when the tooth of the toothed belts 7, 8 is started and finished to mesh with a tooth of pulleys (2, 5),(3, 6) for the toothed belt. As a result, the fluctuation of a speed in transmission of drive power is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of using a toothed heald, and more particularly to a method of using a toothed belt for transmitting driving force.

[Prior Art] Conventionally, for example, as shown in FIG.
3, the toothed belt 51 is inserted between the drive-side toothed belt pulley 54 attached to the drive shaft 52 and the driven-side toothed belt boot U 55 attached to the driven shaft 53. The hook was passed to transmit the driving force.

[Problem to be solved by the invention]

In the conventional method of using a toothed belt as described above, even if the drive shaft 52 is rotating at a constant speed, the teeth of the drive-side toothed belt boot IJ54 and the teeth of the toothed belt 51 may start to mesh with each other. For example, when the meshing is finished, the toothed heald 51 has one tooth pin as shown in the 6th article,
A speed fluctuation occurs that is periodically repeated for each movement, and the speed fluctuation that occurs in the toothed heald 51 causes the teeth of the toothed belt 51 and the teeth of the driven side toothed belt pulley 55 to start or end meshing. There is a problem in that the driven shaft 53 is unable to rotate at a constant speed because the speed fluctuation is transmitted to the driven shaft 53 in the form of further speed fluctuations, resulting in large speed fluctuations occurring in the driven shaft 53. .

Here, the transmission speed of the toothed belt 51 is v [mm/s
ec], the tooth pitch of the toothed belt 51 is d [mm
] Then, the first-order frequency component of the speed fluctuation that occurs is as shown in the following equation.

r = −[Hz] d In view of the above-mentioned points, an object of the present invention is to use a plurality of toothed belts with their teeth shifted by a half-tooth pitch, thereby improving driving force transmission through tooth meshing. It is an object of the present invention to provide a method for using a toothed belt that can suppress speed fluctuations.

[Means to solve the problem]

A method of using a toothed belt according to the present invention is characterized in that, in a toothed belt that transmits driving force, a plurality of toothed belts are used with their teeth shifted by half a tooth pitch.

[Effect]

In the method of using a toothed belt of the present invention, by using a plurality of toothed belts with their teeth shifted by half a tooth pinch, the teeth of the toothed belt and the teeth of the toothed belt boob begin to mesh with each other. Speed fluctuations that occur in the toothed belt periodically for each tooth pitch when the toothed belt finishes meshing or meshing are canceled out among the plurality of toothed belts, and speed fluctuations in driving force transmission are suppressed.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of a driving force transmission mechanism using a toothed belt to which the method of use of the present invention is applied. This driving force transmission mechanism consists of a drive shaft 1 and a drive shaft 1 having the same radius and the same tooth pitch, which are attached to the drive shaft 1 so that the teeth are shifted in a staggered manner by a half-tooth pitch C, which is a half of the one-tooth width d. A first drive side toothed heddle pulley 2 and a second
A drive-side toothed belt boot IJ 3, a driven shaft 4, and a first driven shaft having the same radius and same-tooth pinch attached to the driven shaft 4 so that the teeth of each other are staggered by a half-tooth pitch C. Between the side toothed belt pulley 5 and the second driven side toothed belt pulley 6, the first driving side toothed belt boo I72 and the first driven side toothed belt pulley 5, and the second driving side toothed belt pulley 3 and 2nd
Its main parts are composed of a first toothed heald 7 and a second toothed belt 8, which have the same circumferential length and the same tooth pitch and are passed between the driven side toothed belt pulley 6. Note that the driving shaft l and the driven shaft 4 are parallel to each other, and the first toothed heald 7 and the second toothed belt 8 are arranged so that their teeth are shifted by a half-tooth pinch C. There is.

In such a driving force transmission mechanism, when the drive shaft 1 rotates, the first drive side toothed heald pulley 2 and the second drive side toothed belt pulley 3 rotate, and the first toothed belt 7 and the second drive side toothed belt pulley 3 rotate. The two-toothed belt 8 is conveyed, the first driven toothed heald pulley 5 and the second driven toothed belt pulley 6 are driven, and the driven shaft 4 is rotated.

FIGS. 2(a), (b) and (C) show the first toothed belt 7 and the second toothed belt in such a driving force transmission mechanism.
7 is a graph for explaining speed fluctuations of the toothed belt 8. FIG. FIG. 2(a) shows a graph of speed fluctuations occurring on the first toothed belt 7, and FIG. 2(b) shows a graph of speed fluctuations occurring on the second toothed belt 8. In either case, the speed is periodically repeated every tooth pitch d due to the torque ripple that occurs when the teeth of the toothed belt and the teeth of the toothed heddle pulley start and end meshing. Change is occurring.

However, the teeth of the first toothed belt 7 and the second toothed belt 8
Since the teeth are shifted by a half-tooth pinch C, Fig. 2 (a
) and the second graph (b), the phases of the speed fluctuations that are periodically repeated every tooth pitch and d are shifted by half a wavelength from each other. Therefore, the first toothed heald 7
and the drive shaft 1 to driven shaft 4 via the second toothed belt 8
The speed fluctuation in the driving force transmission between the two is a combination of the speed fluctuation of the first toothed heald 7 and the speed fluctuation of the second toothed belt 8, and the phase of these two speed fluctuations is shifted by half a wavelength. The synthesized velocity fluctuation is shown in Figure 2 (c
), they cancel each other out and almost disappear. As a result, the driven shaft 4 is
It will rotate at a constant speed that is almost the same as the rotation speed of.

FIG. 3 is a perspective view showing another example of a driving force transmission mechanism using a toothed belt to which the method of use of the present invention is applied. This driving force transmission mechanism includes a drive shaft 31, a drive side toothed belt pulley 32 attached to the drive shaft 31, a first driven side toothed belt pulley 35 attached to a first driven shaft 33, A second driven shaft 34 is attached to the second driven shaft 34 and has the same tooth pitch as the first driven side toothed belt pulley 35.
A first toothed heald 37 that is hooked between the driven side toothed belt pulley 36, the driving side toothed belt pulley 32, and the first driven side toothed belt pulley 35, and the driving side toothed belt pulley 37. A hook is passed between the boot IJ32 and the second driven side toothed belt pulley 36, and the first toothed heald 37
and a second toothed belt 38 having the same tooth pitch and notch. Note that the drive shaft 31. The first driven shaft 33 and the second driven shaft 34 are parallel to each other.

In such a driving force transmission mechanism, when the drive shaft 31 rotates, the drive-side toothed belt pulley 32 rotates, and the first
The toothed heald 37 and the second toothed belt 38 are conveyed, and the first driven toothed belt pulley 35 and the second driven toothed belt pulley 36 rotate to rotate the first driven shaft 33 and the second toothed belt. The driven shafts 34 each rotate.

Now, as shown in FIG. 4, assuming that the rotation direction of the drive shaft 31 is counterclockwise, the meshing point of the first toothed heald 37 with the drive-side toothed belt pulley 32 is Pl,
Since the engagement point of the second toothed heald 38 is P2, the condition that the engagement timing between the first toothed heald 37 and the second toothed belt 38 is shifted by a half tooth pitch C is that the first toothed heald 37 The meshing interval arc angle θ between the second toothed belt 38 and the second toothed belt 38 is set so as to satisfy the following equation (1).

e−□ Δθ+nΔθ ・ ・ ・(
1) However, n is an integer greater than or equal to 0, Δθ is the meshing pinch arc angle which is the arc angle of 1 tooth pitch d, and Δθ-360/z for the number of teeth of the drive-side toothed belt pulley 32, which is 2. (deg.
).

If the above formula (1) is satisfied, the teeth of the first toothed heald 37 and the second toothed heald 38 are shifted by a half-tooth pinch C, which is 1/2 of the one-tooth bift d. Therefore, the same operation and effect as explained in FIGS. 2(a), (b), and (C) can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, by using a plurality of toothed belts with their teeth shifted by a half-tooth pinch, speed fluctuations in driving force transmission due to meshing of toothed healds are significantly suppressed. The effect is that it can be done.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a driving force transmission mechanism using a toothed belt to which the usage method of the present invention is applied, and FIG. 2(a)
, (b) and (C) are graphs for explaining speed fluctuations of the toothed belt in the driving force transmission mechanism shown in FIG. FIG. 4 is a perspective view showing another example of the driving force transmission mechanism; FIG. This figure is a perspective view showing an example of a conventional driving force transmission mechanism using a toothed belt, and FIG. 6 is a graph showing speed fluctuations of the toothed heald in the driving force transmission mechanism shown in FIG. 5. In the figure, 1.31. Drive shaft, 2.. First drive side toothed heald pulley, 3..
・Second driving side toothed heald pulley, 4...driven shaft, 5.35・First driven side toothed heald pulley, 6.36
・2nd driven side toothed heddle pulley, 7.37・1st toothed belt, 8.38・2nd toothed belt, 32...pulley for drive side toothed belt, 33...1st driven Shaft, 34 ・ C-contact d ・ θ ・ Δθ ・ ・Second driven shaft, ・Half-tooth pitch, ・1-tooth pinch, ・Mesh interval arc angle, ・Mesh pitch arc angle.

Claims (1)

[Claims] A method of using a toothed belt for transmitting driving force, characterized in that a plurality of toothed belts are used with their teeth shifted by a half-tooth pitch.