JPH05104450A - Planetary arm assembling jig - Google Patents

Abstract

PURPOSE:To simply attach a spring for attaching a planetary gear to a planetary arm used for a planetary mechanism or the like to control the running direction of a ink ribbon in the ink ribbon cartridge carrier of a printer. CONSTITUTION:A guide pin 1 supported by a plate 3 is inserted in the central hole of a planetary arm 4 to hold it. A pair of right and left taper pins 2 pushingly widen the space of a notch in an arm part as the planetary arm 4 is pushed downward, and a pipe-shaped spring having a slit can therefore be simply inserted in a spring inserting part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planet arm assembling jig, and more particularly, a spring for mounting a planet gear is attached to a planet arm used for a planet mechanism for controlling the traveling direction of an ink ribbon of an ink ribbon cartridge carrier of a printer. Regarding jigs.

[0002]

2. Description of the Related Art In a carrier of an ink ribbon cartridge of a printer, a planetary mechanism is used to make the running direction of the ink ribbon constant regardless of the running direction of the cartridge. A planetary arm used for this planetary mechanism is shown in FIG. The planetary arm 4 is provided with a central hole 41 at the center thereof, which is inserted into the central axis, and is provided with notches 43 on the left and right sides.
Is provided with an arm portion 42. A spring insertion portion 44 for inserting the pipe-shaped spring 5 having a slit for mounting the planetary gear is provided at the tip of the arm portion 42.

The insertion of the spring 5 into the planetary arm 4 has conventionally been done manually by an operator. That is, the work of bending the arm portion 43 of the planetary arm 4 to widen the gap between the notches 43 of the spring insertion portion 44 and inserting the spring 5 therein is completely performed by the operator.

[0004]

In this conventional method for assembling the planetary arm, an operator must hold the planetary arm with one hand while pushing the spring insertion portion wide, and then insert the spring with the other hand. However, there were the following problems.

First, the spring insertion part of the planetary arm is
Despite being made of synthetic resin, it is too small and hard to spread with one hand.

Next, since the spring is small and easily deformed, and the directionality at the time of insertion must be taken into consideration, it is extremely difficult to insert it.

[0007]

A planetary arm assembly jig of the present invention is a cylindrical guide pin that is inserted into a central hole of a planetary arm for inserting into a central axis of a planetary mechanism and that holds the planetary arm. , For mounting the planetary gear of the planetary mechanism, which is inserted between the notches of the arm part of the planetary arm having elasticity and notches and bending the arm part to widen the gap of the notch The taper-shaped taper pin that allows the pipe-shaped spring having the slit to be inserted into the spring insertion portion at the tip of the arm portion, and the plate that supports and fixes the guide pin and the taper pin.

[0008]

The present invention will be described below with reference to the drawings.

1A and 1B are external views showing an embodiment of the present invention. FIG. 1A is a front view, FIG. 1B is a top view, and FIG. 1C is a planet arm 4 with a spring 5 attached. It is a perspective view which shows a mode that it inserts. 2 shows the planet arm 4 and the spring 5
It is a figure which shows the state which inserted, Drawing (a) is a front view,
Drawing (b) is a side view.

In FIG. 1, the assembly jig of the present embodiment is such that a center hole 41 of a planetary arm 4 is provided on one side of a flat plate 3.
And a cutout 43 of the planetary arm 4 held by the guide pin 4
And a pair of left and right conical taper pins 2 that bend the arm 42 as it is inserted and widen the gap between the notches 43 of the spring insertion portion 44.

A method of mounting the spring 5 on the planetary arm 4 using this assembly jig will be described.

The center hole 41 of the planetary arm 4 is fitted into the guide pin 1 of the assembly jig, the notch 43 of the arm portion 42 is fitted into the tip of each taper pin 2, and the planetary arm 4 is gradually pushed toward the plate 3. Since the taper pin 2 has a thick base, the arm portion 4 is pushed as the planetary arm 4 is pushed in.
The interval between the cuts 43 in the spring insertion portion 44 at the distal end of the flexible arm 42 is widened, so that the pipe-shaped spring 5 having a slit can be easily inserted into the spring insertion portion 44. This spring 5 is provided with a collar at its upper end, and this collar has a spring insertion portion 44.
The insertion direction of the spring 5 is adjusted so that the spring 5 is inserted between the two protrusions 45. After the spring 5 is inserted, when the planetary arm 4 is pulled out from the assembly jig, the flexure of the arm portion 42 tries to return to its original position and the spring 5 is securely fixed.

[0013]

As described above, according to the present invention, when the work of inserting the spring into the planetary arm is performed, the spring inserting portion of the planetary arm is pushed and widened by inserting it into the taper pin, so that the work of inserting the spring is extremely easy. It has the effect of being able to Further, since it is not necessary to forcefully insert the spring, it is possible to prevent the spring from being deformed.

[Brief description of drawings]

1A and 1B are external views showing an embodiment of the present invention, in which a partial view (a) is a front view, a partial view (b) is a top view, and a partial view (c) is a state in which a spring is inserted in a planetary arm. It is a perspective view shown.

2A and 2B are diagrams showing a state in which a spring is inserted in a planetary arm, where FIG. 2A is a front view and FIG. 2B is a side view.

[Explanation of symbols] 1 guide pin 2 taper pin 3 plate 4 planetary arm 5 spring 41 center hole 42 arm part 43 notch 44 spring insertion part 45 protrusion

Claims (1)

[Claims] 1. A cylindrical guide pin that is inserted into a central hole of a planetary arm that is inserted into a central axis of a planetary mechanism and holds the planetary arm, and a planetary arm that is elastic and has a notch. Inserted between the notches of the arm portion, the arm portion is bent to widen the gap between the notches, and a pipe-shaped spring having a slit for mounting the planetary gear of the planetary mechanism is provided at the tip of the arm portion. A planetary arm assembly jig comprising: a conical taper pin that can be inserted into a spring insertion part; and a plate that supports and fixes the guide pin and the taper pin.