JPS6313052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adjustment method for adjusting the distance between the axes of a power transmission mechanism consisting of a plurality of sets of gears.

In a power transmission mechanism consisting of multiple sets of gears,
The position of a specific shaft among the shafts on which gears are attached is determined by the equipment configuration, but the shaft of the gear that is interposed between the gears attached to a specific shaft and simply transmits power is In order to absorb dimensional errors during parts processing, the position is generally configured to be finely adjusted, and the final position is determined by shifting the position while observing the power transmission status.

In assembling such a power transmission mechanism, it is desired to realize an adjustment method that can easily determine the position of the gear shaft.

[Conventional technology]

FIG. 2 is a perspective view showing a power transmission mechanism in a small thermal printer.

In the figure, gear 1 is fixed to a shaft 5 of an electric motor 4, and gear 2 is fixed to a platen 6.
The positions of the electric motor 4 and the platen 6 are determined due to the structure of the thermal printer, and the position of the shaft 7 fitted with the gear 3, which is formed by integrating a gear 3a that meshes with the gear 1 and a gear 3b that meshes with the gear 2, is determined. By finely adjusting this, it is possible to absorb dimensional errors, etc. during machining of parts such as gears and bearings, and to ensure smooth power transmission from the electric motor 4 to the platen 6.

In general, in order to transmit power smoothly in a power transmission mechanism constructed by combining gears, it is necessary to provide an appropriate play (called backlash) between the meshing tooth surfaces. Backlash is caused by the thermal expansion of the gears. This is provided to prevent teeth from creaking due to eccentricity, etc. If the backlash is small, the squeak between teeth cannot be removed and the load on the motor increases or the load fluctuates. . Also, if the breakdown is large, noise, vibration, etc. will be generated.

Conventionally, in order to provide appropriate backlash between gear 1 and gear 3a and between gear 2 and gear 3b, the position of shaft 7 is moved within an adjustment range while rotating gear 1 by hand. The shaft 7 is fixed at a position where it can be smoothly transmitted from the electric motor 4 to the platen 6.

[Problem that the invention seeks to solve]

The above-mentioned adjustment method has a problem in that it requires a lot of time for adjustment and the power transmission state is not stable because there are large individual differences and differences occur depending on the skill level of the work.

[Means for solving problems]

The above problem can be solved by the present invention, which fixes the position of the shaft of the gear by sandwiching a film having an appropriate thickness between the teeth of the gears that mesh with each other, and then discharges the film from between the gears. This problem is solved by a method for adjusting the distance between gear axes.

[Effect]

Films with an appropriate thickness, such as polyester films, which are sandwiched between the teeth of mutually meshing gears, are commercially available in various thicknesses, and a film with an appropriate thickness is selected from these and used. By doing so, a gap can be provided between the gears for the smoothest transmission of power.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of the method for adjusting the distance between gear axes according to the present invention, and symbols a to c in the figure show the adjustment order. Note that the same objects as in FIG. 2 are represented by the same symbols.

As shown in Fig. 1a, the shaft 7 is temporarily fixed to the extent that it can be easily moved within the adjustment range by pressing lightly, and a film 8a of an appropriate thickness made of polyester or the like is inserted between the gears 1 and 3a. and rotate gear 3a to shaft 7.
and press it against gear 1.

Next, as shown in FIG. 1b, a film 8b of an appropriate thickness made of polyester or the like is inserted between the gear 2 and the gear 3b, and the gear 3b is pressed together with the shaft 7 against the gear 2, and the shaft 7 is fixed in that position. do.

The rear gear 2 is then rotated by hand to eject films 8a and 8b made of polyester or the like from between the gears as shown in FIG. 1c.

The above operation allows the position of the gear shaft to be easily determined regardless of individual differences or skill level, and also stabilizes the power transmission state.

〔Effect of the invention〕

As described above, according to the present invention, the position of the gear shaft can be easily determined regardless of individual differences or skill level, and it is also possible to provide a method for adjusting the distance between gear shafts that stabilizes the power transmission state.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the present invention, and a to c of the same figure.
indicates the adjustment order. FIG. 2 is a perspective view showing a power transmission mechanism in a small thermal printer. In the figure, 1, 2, 3 are gears, 4 is an electric motor,
5 is the shaft of the electric motor, 6 is the platen, 7 is the gear shaft, 8
a and 8b each represent a film.

Claims (1)

[Claims] 1. A method for adjusting the distance between the shafts of a power transmission mechanism consisting of a plurality of sets of gears, which comprises inserting a film having an appropriate thickness between the teeth of mutually meshing gears to adjust the position of the shafts of the gears. A method for adjusting the distance between gear axes, comprising: fixing the film, and then ejecting the film from between the gears.