JPS60183153A - Daisy wheel positioning mechanism - Google Patents

Abstract

PURPOSE:To make it possible to prevent the damage of a daisy wheel, by performing the positional determination of a support table and the detachment of a daisy wheel by a detachment lever and protruding the daisy wheel after perfectly erecting the support table. CONSTITUTION:When the first stage pulling operation of a detachment lever 25 is performed against a tensile spring 28, said lever 25 is inclined around the pin 24 fixed to the bracket 26 of a support table 22 and a shaft rod 27 is taken out from a circular arc shaped hook part 25nk to be contacted with the lower rear surface of a slot 25n while a shaft rod 25 is transferred to the almost center of a circular arc shaped hole 25e and a bent part 25m is separated from a base plate 22k and a push-out part 25mp slightly approaches to a daisy wheel 6. By the succeeding second stage pulling operation, the detachment lever 25 is further inclined and, at the same time, the support table 22 is also contacted with a stopper 30 by a spring 29. When third stage pulling operation is performed to revolve the lever 25 against the spring 28 until the shaft rod 27 is inlaid with the recessed part 25nk, the push-out part 25mp pushes up the daisly wheel 6 to detach the same from a drive shaft 7 and said daisy wheel 6 is received by a receiving part 22d.

Description

[Detailed description of the invention] [Technical backbone] The present invention relates to a daisy wheel positioning mechanism.

[Prior art]

As a conventional daisy wheel positioning mechanism, there is one shown in FIG. 1, for example.

To describe its structure, the support stand 2 to which the selection motor 1 is fixed has a U-shaped cross section with side plates 2a and 2b sandwiching the motor 1 at both ends of the substrate 2. It is rotatably attached by a shaft 3 that passes through the lower tips of the plates 2a and 2b and is fixed to a carrier frame (not shown), and is rotatably attached to the center of the outer surface of one side plate 2a of the support base 2. Nearby, a lifting lever 5 having a desired shape is rotatably supported by a pin 4 at its center. A two-part protrusion 5ut is provided on the upper end 5u of the lever 5 and is bent so as to contact the outer surface of the base plate 2. The lower end 51 also abuts the outer surface of the substrate 2 and has a bend -fp 5 'l m extending close to the drive shaft 7 of the motor 1 into which the daisy wheel 6 is fitted. A lower protrusion 51t for pushing out the wheel 6 to escape from the drive shaft 7 is provided at the tip of the bent portion 51m, and a tension coil spring 8 is hooked between the base plate 2 and the lower protrusion 51t. The pulling lever 5 is always urged to rotate in the direction of arrow A. Note that the side plate 2a has the following:
A long hole 2n extends downward from the mounting position of the pin 4 into the hook part 2.
The holes are drilled to form n+<. The positioning lever 10, whose lower end is rotatably supported by another shaft 9 fixed to the carrier frame, has a pin 10p at its second end that engages and slides in the elongated hole 2n. It has a protruding
In addition, the tension coil spring 11 hooked between the central portion and the carrier frame is always biased in the direction of arrow B, and when the pin 10p is fitted into the hook portion 2nk of the elongated hole 2n, The support stand 2 is positioned.

To attach and detach the daisy wheel 6, first pull the lifting lever 5 in the direction of arrow 11 against the tension of the tension fill spring 8.
The upper protrusion 5ut rotates around the base plate 2 of the support base 2.
However, at this time, the lower protrusion 51t of the lower end 51 pushes the daisy wheel 6 to escape from the drive shaft 7, so the wheel 6 is guided by the guide portion 12 provided on the carrier frame and rotates as shown above. The daisy wheel holder, which is formed in an L shape and extends downward from the substrate 2, rests on the portion 2kd.

As shown in FIGS. 1 and 2, the daisy wheel 6 has a U-shaped spring 6b fixed to the outer surface of the shaft hole 6a, and is fitted into the outer circumferential groove 7m of the drive shaft 7. Since it is designed to be fixed, the structure allows for detachment from the drive shaft I by a simple pushing operation for pushing out the wheel 6.

Subsequently, when the raising lever 5 is pulled to the second step in the direction of arrow P7, the upper protruding portion 5ut pushes the substrate 2k, and the support base 2 is rotated and tilted around the shaft rod 3. Therefore, the positioning lever 10 rotates in the same direction about the shaft 9, but the pin 10p moves along the long hole 2n of the side plate 2a and reaches the lower end 2nb of the long hole 2n, where it is supported. Rotation of the table 2 is stopped. Then, when you release your hand from the lifting lever 5, the lever 5 rotates back by the distance of the dotted arrow 83 due to the tension of the tension coil spring 8, and the lower end 51 of the lifting lever 5 comes into contact with the board 2k.] ; The protruding portion 5ut is separated from the substrate 2k. In this state,
The daisy wheel 6 is attached and detached, and the lifting lever 5
Return it to its original position and prepare it for use.

However, in such a conventional positioning mechanism, the daisy wheel falls off before the selection motor is raised, so parts to protect the wheel are required, and a lifting lever and a support stand for the selection motor are required. Since the positioning parts 16 are independent from each other, there is a problem that the number of parts increases.

[Purpose of the invention]

The present invention has been made in view of the problem described in I- above, and has a structure in which the daisy wheel is ejected after the selection motor is activated by a single detachment/detachment lever.
The purpose is to solve these problems.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIG. 3 and subsequent figures. Note that the same members as in the conventional example are designated by the same reference numerals, and their explanations will be omitted.

To describe the tf and s configurations, the support base 22 to which the selection motor 1 is fixed is formed by providing side plates 22a and 22b at both ends of the base plate 22, as in the conventional example, and the support base 22 fixes the selection motor 1.
, 22b, and is rotatably attached by a shaft rod 23 fixed to a carrier frame (not shown), and the upper part of one side plate 22a of the support base 22. A bracket 26 having a U-shaped cross section is fixed to the outer surface closer to the substrate 22.
A part of the lever 25 for detaching and detaching is attached to 6 by a pin 24 so that it can be rotated. Note that the substrate 22 has a daisy wheel support portion 22d extending downward and bent into an L-shape.

The lever 25 for detaching is attached to the hole 2 to be attached to the pin 24.
It is formed from a narrow upper part 25u in which a hole 5a is drilled and an enlarged flat plate F part 251, and an arcuate hole 25e centered on the hole 25a is bored to allow the shaft 23 to pass through it. The hole 25 also extends from the same arcuate hook 25nk located behind it (on the left in FIGS. 3 and 4).
A long hole 25n extending in the direction a is bored, and four extrusion holes 2 curved backward are formed at the upper end of the long hole 25n.
5nk is provided, and the elongated hole 25n is formed into a substantially Z-shape as a whole. Furthermore, a bent portion 25m having an extruded portion 25mp extending close to the drive shaft I and separating the daisy wheel 6 from the drive shaft 7 is provided at a required location on the front side of the lower portion 251. The lever 25 is rotated about the hole 25a by a tension coil spring 28 hooked between the rear end of the side plate 22a of the support base 22 and the tip of the lower part 251 of the lever 25. is always biased in the direction of arrow M (see FIG. 4, 1), and the arcuate hook portion 25nk of the long hole 25n is pressed against the long hole 25n.
The front end of the arcuate hole 25e abuts the shaft rod 23, and the bent portion 25m contacts the substrate 22. The shape is such that it is in contact with the outer surface of. The support stand 22 is connected to the tension coil spring 2B, which is hooked between the ends of the side plates 22a and 22b and the carrier frame.
The tension fill springs 29, 29 which are stronger than the shaft rod 23
However, as mentioned above, the arc-shaped hook portion 25nk of the lever 25 for attaching and detaching comes into contact with the shaft rod 27, and rotation is restrained, so that the support stand 2
2 is in a positioned state.

Next, the operation will be described with reference to FIG.

When the detachment lever 25 is pulled in the first stage by the direction of the arrow 91 against the tension of the tension fill spring 28, as shown in FIG. The pin 24 fixed to the bracket 26 is tilted toward the front side as an axis, and the shaft rod 27 comes out from the arcuate hook portion 25nk and enters the elongated hole 25.
n, and the shaft rod 23 is in contact with the rear surface of the lower part of the circular arc hole 25.
e-11 is moved to the center position, and the bent portion 25m is further separated from the substrate 22k so that the extruded portion 25m1) is slightly closer to the daisy wheel 6. Subsequently, as shown in FIG. III, by the second pulling operation, the detaching lever 25 is further tilted by an arrow 92 with the shaft 23 as the axis, and the shaft 27 moves to the top of the elongated hole 25n and comes into contact with it. However, in particular, the support stand 22 is also rotated by the tension of the tension fill spring 29 along with the detaching lever 25 until it is installed on the carrier frame and comes into contact with the tasto collar 30.

Then, by further pulling operation in the fifth stage, the tensile fill 2
Resisting the tension at B, rotate the lever 25 for taking off and taking off by 93 minutes as shown by the arrow in the same figure, about the pin 24 until the rod shaft 27 is inserted into the extrusion gate 25nk, and at the same time. The rod shaft 23 also advances forward in the arcuate hole 25e, and the extruded portion 25mp of the bent portion 25m is connected to the daisy wheel 6.
Since the wheel 6 is pushed out from the drive shaft 1 by pushing L1, the wheel 6 is received by the daisy wheel receiver part 22d. When the lever 25 is released, it returns to the state shown in FIG. 3 under the tension of the tension fill spring 28, so that the daisy wheel 6 can be newly mounted.

Note that, although the pulling operation of the detachment/detachment lever is divided into stages for convenience of explanation, it may be performed in one continuous operation.

To return the daisy wheel 6 to its operating condition, the attachment/detachment lever 25 is pushed back to its original position, and each member operates in the reverse order described above and is positioned as shown in FIG. 1.

In the embodiment, the daisy wheel positioning mechanism of the present invention is provided only on one side of the side plate 22a of the support section 22, but it may be symmetrically added and operated on the side plate 22b side.

〔Effect of the invention〕

As explained above, in the present invention, the shaft rod that rotatably supports the support part of the selection motor is passed through the side plate of the support part, and the rotatable detachment lever is attached to the outer surface of the side plate. , an arc-shaped hole through which the shaft rod passes through and a two-shaped elongated hole through which another shaft rod passes through the lever, and a daisy wheel extrusion portion is provided in the side plate. The structure is such that an elastic body is interposed between the carrier frame and the lever for detaching and detaching, and a collar for controlling the rotation of the support base is installed on the carrier frame. The lever can position the support base and release the daisy wheel, and the daisy wheel is pushed out after the support base has been completely raised, which prevents damage to the wheel. There is no need for protective parts, and the structure is simple and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side view showing a conventional daisy wheel positioning mechanism, FIG. 2 is an explanatory perspective view showing the main part of the daisy wheel that fits with the drive shaft, and FIG. 3 is a main part of the present invention. Fig. 4 is an explanatory side view showing the operating status, Fig. 1 is a view when the support base of the selection motor is positioned, and Fig. 11 is the first stage pulling operation of the detachment/detachment lever. FIG. 111 is a diagram showing the state in which the support base is tilted toward the front side due to the second pull operation, and FIG. FIG. 1... Selection motor 6...
・・・・・・ Dizzy wheel 22 ・・・・・・・・・
... Support stand 22a ... Side plate 22b ... Side plate 23 ... Axis rod 24 ...... Bin 25 ... ... Putting on and taking off, <-25mp・
..... Extrusion part 2γ ..... Axial rod 28 ..... Tension fill spring 29 ...
・・・・・・Tension coil spring 30 ・・・・・・・・・
Stopper Figure 1 Figure 2 Figure 3 (5nk Figure 4 (1) (II) (rV)

Claims (1)

[Scope of Claims] A detachment/detachment lever is rotatably pinned to a side plate of a selection motor support base rotatably supported on a shaft fixed to a carrier plate, and the shaft is attached to the detachment/detachment lever. An arcuate hole for passing through the carrier frame and a long hole for passing another shaft fixed to the carrier frame, and an extrusion part for the daisy wheel are provided in the side plate. An elastic body is interposed between the supporting base and the supporting base.
- A positioning mechanism for a daisy wheel, characterized in that a stopper is installed on the carrier frame.