JPH0566324U - Shaft position adjustment mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a shaft position adjusting mechanism that has a high resolution and a wide adjustment range in a small mounting space. [Structure] A shaft attached in an eccentric position with respect to a central axis, and a decelerating and rotating mechanism for directly or indirectly rotating the shaft.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shaft position adjusting mechanism, and more particularly, to adjusting a shaft position by an eccentric structure.

[0002]

[Prior Art]

 For example, in a recorder with a structure in which the carriage is moved in a direction orthogonal to the recording paper feed direction, the carriage must be moved parallel to the platen around which the recording paper is partially wound, and the carriage must be used as a main shaft and a guide shaft. Is configured to be engaged with and slid to.

By the way, in order to obtain stable print quality at any printable position, it is necessary to keep a constant distance between the carriage and the platen within the movable range of the carriage. The axes must be kept parallel to each other. Therefore, in a conventional recorder, for example, as shown in FIG. 5, one end of the guide shaft is supported by a rotatably mounted boss, and the positional relationship of the guide shaft with respect to the platen and the main shaft depends on the rotation angle of the boss. Is being adjusted.

In FIG. 5, reference numeral 1 is a platen around which a recording paper (not shown) is wrapped. A carriage 2 is provided with a recording head such as a recording pen (not shown) so as to face the platen 1. Reference numeral 3 is a main shaft, and 4 is a guide shaft, which are arranged parallel to the platen 1. The carriage 2 is slidably engaged with the main shaft 3 and the guide shaft 4. One end of the guide shaft 4 is attached at a position displaced from the rotation center of the rotatable boss 5. The boss 5 is rotationally driven by the lever 6.

In such a configuration, when the boss 5 is rotated by the lever 6, the mounting position of the guide shaft 4 is the radius of the distance between the rotation center of the boss 5 and the mounting center of the guide shaft 4, that is, the eccentricity L ₁ . And changes along the circumference. Therefore, by supporting at least one end of the guide shaft 4 with such a structure, the parallel positional relationship between the platen 1 and the guide shaft 4 with respect to the main shaft 3 can be arbitrarily adjusted, and the distance x between the platen 1 and the carriage 2 can be adjusted appropriately. You can adjust the value. Assuming that the length of the lever 6 from the rotation center of the boss 5 is L ₂ , the position of the guide shaft 4 is adjusted by the lever ratio of L ₁ : L ₂ , and the larger the lever ratio, the higher the resolution. And fine adjustment becomes easy. Then, the maximum value of the adjustment range is determined by the eccentric amount L ₁ .

FIG. 6 and FIG. 7 are explanatory views of other conventional configurations. In FIG. 6, the central portion of the fan-shaped plate 7 is integrated with the boss 5, and the pin 9 provided on the side plate (not shown) is engaged with the groove 8 provided in the peripheral portion of the plate 7. In FIG. 7, a pin 11 is provided at the other end of the lever 10 whose one end is fixed to the boss 5, and is engaged with the groove 13 of the side plate 12. With these configurations, the operation is substantially the same as in FIG.

[0007]

[Problems to be solved by the device]

However, according to these conventional configurations, if the eccentricity L ₁ is increased in order to increase the adjustment range, the lever ratio becomes relatively small and the resolution is reduced at the same lever length L ₂ , and the equivalent resolution is obtained. In order to obtain resolution, it is necessary to lengthen the lever length L ₂ in accordance with the eccentricity L ₁ .

Since the adjustment range is also regulated by the lever movable range, a long lever and a wide movable range thereof are required to satisfy both the requirements for high resolution and a wide adjustment range, and it is difficult to miniaturize. Is. The present invention solves such a problem, and an object of the present invention is to realize a shaft position adjusting mechanism having a small mounting space, high resolution, and a wide adjustment range.

[0009]

[Means for Solving the Problems]

 The present invention, which solves such a problem, is characterized by comprising a shaft mounted in an eccentric positional relationship with respect to a central axis, and a reduction rotation mechanism for directly or indirectly rotating the shaft. And

[0010]

[Action]

 The resolution in such a configuration is set according to the reduction ratio of the reduction rotation mechanism, and the adjustment range is set according to the amount of eccentricity of the shaft. As a result, it is possible to realize a shaft position adjusting mechanism that has a high resolution and a wide adjustment range in a smaller installation space than before.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a structural explanatory view showing an embodiment of the present invention, and the same reference numerals are given to the same parts as in FIG. In the figure, one end of a guide shaft (shaft) 4 is attached at a position displaced from the center of rotation of a rotatable toothed wheel 14. Reference numeral 15 is an adjusting gear which is manually rotated as required. A latch claw 16 is arranged on the outer periphery of the adjusting gear 15 so as to be fitted in a tooth groove, and a gear 17 having a diameter smaller than that of the gear 14 is coaxially mounted so as to mesh with the gear 14 at the central position. ..

In such a configuration, the engagement of the latch claw 16 is released and the adjusting gear 15 is manually rotated, whereby the rotation of the gear 15 is decelerated and transmitted to the gear 14 via the gear 17. Then, as the gear 14 rotates, the shaft 4 moves in the circumferential direction whose radius is the eccentricity. FIG. 2 is an operation explanatory diagram of FIG. Assuming that the diameter of the gear 14 is r ₁ , the diameter of the adjusting gear 15 is r ₂ , the diameter of the gear 17 is r ₃ , and the mounting eccentricity of the shaft 4 is x, the amount of rotation of the adjusting gear 15 and the vertical center of the shaft 4 relationship of the movement _{amount, (r 2 / r 3)} × (x / r 1): set to 1, the area required at this _{time, a x × d y a x} = 2r 1 d y = 2r 1 + r 2 + r Become ₃ . Within this area, the shaft 4 can move ± x vertically.

FIG. 3 is an operation explanatory diagram of a conventional configuration for comparison with FIG. That is, in the case of the conventional lever system, the movement amount of the guide shaft 4 is (x / r): 1, and a half circle area of radius r is required to obtain the movement amount of ± x. A larger area than 2 must be secured.

Although a spur gear is used as the deceleration rotation mechanism in the above embodiment, a worm gear or the like may be used depending on the position where the spur gear is incorporated. It is also possible to provide a tooth groove on the outer circumference of the shaft and configure a deceleration rotation mechanism by engaging a gear with a special shape corresponding to the movement trajectory of the shaft. Further, in the embodiment, the example of the mechanism for accurately adjusting the position of the guide shaft of the carriage in the recorder has been described, but the present invention can be applied to various shaft position adjusting mechanisms.

[0015]

[Effect of the device]

 As described above, according to the present invention, it is possible to realize a shaft position adjusting mechanism having a high resolution and a wide adjusting range in a small mounting space.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of FIG.

FIG. 3 is an operation explanatory diagram of FIG. 4;

FIG. 4 is a structural explanatory view showing an example of a conventional mechanism.

FIG. 5 is a configuration explanatory view showing another example of a conventional mechanism.

FIG. 6 is a structural explanatory view showing another example of a conventional mechanism.

[Explanation of symbols]

 4 Guide shaft (shaft) 14,17 Gear 15 Adjusting gear 16 Latch claw

Claims (1)

[Scope of utility model registration request] 1. A shaft position adjusting mechanism comprising a shaft mounted in a positional relationship eccentric with respect to a central axis, and a deceleration rotating mechanism for directly or indirectly rotating the shaft.