JPS5936465Y2 - type wheel device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a type wheel device using a type body having an array of type characters.

Conventionally, printing is performed by arranging type wheels as many as the number of digits on the same axis, rotating each type wheel and selectively locking it at an appropriate position to perform printing. Various methods and devices have been devised for making or using type wheels that can operate at low power.

These printing devices are required to be particularly compact when considering their application as small printers for calculators and the like.

That is, it is practical to set the pitch in the digit direction to about 3 spaces, but in this case, the size of the type is required to be about 2 spaces.

For this reason, the dimensions of the parts that make up the type wheel are extremely limited.

As a printing device devised under the above-mentioned current situation,
The printing device described in JP 0-1.52712 is shown in FIGS. 1 and 2.

This printing device has a type ring spring which forms an arc shape in the side groove of the type ring and includes a first protrusion that engages with a notch of a rotating shaft and a second protrusion that engages with the type ring. To explain in detail based on the drawing, the type ring spring 1 is not fixed at both ends and engages with the opening 4 and recess 5 of the type ring bearing so that the type ring spring 1 can be attached to and removed from the type ring side groove 3. installed,
A spring force is already applied at the time of installation to prevent disengagement.

Therefore, when a type is selected and the protrusion 2 of the type ring spring and the outer periphery of the shaft 6 slide, the spring force generated by the tip of the protrusion displacing to the position of the outer periphery of the shaft is combined with the initial spring force at the time of installation. The disadvantage is that this causes a large frictional load and the motor power must be increased.

Also, if the typeface and the type ring are made of different materials, typeface 7
It is necessary to clamp the type body to the type wheel, and if the type body is to be clamped in the groove 8 on the outer periphery of the type wheel as shown in FIG. In the case of a type wheel which is required and has severe restrictions on dimensions in the digit direction, it is difficult to mold the clamping flange 10 by plastic molding of 0.2 mm or less, and even if it can be molded, the strength is weak.

The purpose of this invention is to eliminate or reduce the above-mentioned drawbacks, and the friction between the type ring spring made of a thin plate spring material, the gripping body that holds the type body between the type ring, and the protrusion of the type ring spring and the shaft. To provide a novel type wheel device for a button, which is characterized in that it also serves as a spring with a small load.

An embodiment of the present invention will be described in detail below based on the drawings.

Fig. 4 is a left side view showing an embodiment of the present invention, Fig. 5 is a front view thereof, Fig. 6 is a right side view, and Fig. 7 is the BOB of Fig. 6.
FIG. 8 is an AOA sectional view of FIG. 6, and FIGS. 9 and 10 are views of FIGS. 4 and 6 for easier viewing.

In the above figure, a type body 11 made of an elastic material such as porous rubber or plastic has typefaces 12 such as numbers and character symbols integrally molded on its surface, and the typefaces 12 are arranged at equal pitches. The bottom surface has a projection 13 for fitting the type body 11 into the type ring 14.

The type ring 14 has a concave groove 15 into which the type body protrusion 13 is fitted, and an appropriate number of thin openings with an impact of 16°, into which the protrusion 22 of the type ring spring 21 placed on the left side is attached. It has a slit 17 and is mounted so as to be rotatable around a tube shaft 24.

The tube shaft 24 is provided with a narrow slit 25 in the thrust direction, and the ink inside the tube shaft 24 flows out through the slit 25 to the outer surface of the tube shaft 24 due to surface tension and centrifugal force.

A cutout groove 26 is formed in the vicinity of the slit 25 in the tube shaft 24 in the thrust direction.

Also, at one end of the tube shaft 24, there is a knob-shaped cap (not shown) with a transparent end surface so that the remaining amount of ink can be checked.
There is, and when refilling ink, it is configured to take a camp and inject ink.

The type ring spring 21 consists of an outer ring part that holds the type body 11 between the edge of the type ring 14 and an inner ring part that has a protrusion 22 and an arcuate spring 23.

The type ring spring 2 is attached to the pin 18 provided on the side of the type ring 14.
1 is inserted into the mounting hole, and after the insertion, the pin 18 is welded,
The type ring 14 and the type ring spring 21 are integrally connected.

Therefore, the type 11 does not fall off in the thrust direction, and printing with an accurate pitch in the digit direction without surface runout of the type can be obtained.

Serrated teeth 19 are integrally formed on the type ring 14, and relief grooves 30 are provided on the side surface on the side of the serrated teeth 19.

For this purpose, a pin weld 18 provided on another adjacent type wheel
rotate within the relief groove 30, so they do not come into contact with each other.

In addition, as mentioned above, the type ring 14 and the type ring spring 21 are attached to the pin 1.
8, it is possible that the pinch in the digit direction may be uneven due to variations in the accuracy of each part (the more parts that make up the type wheel device, the more uneven the digit pitch becomes.

), the serrated teeth 19 and the type ring spring 21 are installed within the width P of the bearing portion of the type ring 14, and the width P of the bearing portion defines the digit pitch.

In addition, the protrusion 22 of the type ring spring 21 rotates in opposition to the other bearing end of the adjacent type ring so that the protrusion 22 does not escape in the thrust direction from the opening 16 formed in the bearing of the type ring 14, thereby acting as a guide. doing.

Therefore, it is possible to prevent incorrect printing due to malfunction of the type ring due to detachment or breakage of the protrusion 22 of the type ring spring, and a highly reliable mechanism can be achieved.

The selection pawl 27 engages with sawtooth teeth 19 integrally formed on the outer periphery of the type wheel 14, and serves to lock the type 12 in the printing position.

28 is a selection shaft that supports the selection claw.

20 is a stopper projection of the type wheel, and 29 is a stopper provided separately from the type wheel.

To explain the operation of the type wheel device having the above configuration, in the standby state, the projection 22 of the type ring spring is guided by the opening 16 of the type wheel and engages with the cutout groove 26 of the tube shaft 24.

Here, the arcuate spring 23 of the type ring spring 21 opens the opening 16 without applying any spring force. Notch groove 26. As long as the projections 22 of the type ring springs are not disengaged, there is no problem in terms of performance even if a slight play occurs.

In the type selection process, as shown in FIG. 6, the tube shaft 24 rotates in the direction of arrow A (in the opposite direction in FIG. 4), and the type ring 14 also maintains its positional relationship with the tube shaft 24 by the type ring spring 21. Rotate in the same way while hanging down.

When the type to be printed comes to the printing position, the selection pawl 27 rotates in the direction of arrow C around the selection shaft 28, and the serrated teeth 1
9 and stops the rotation of the type wheel 14.

Even when the type wheel 14 stops, the tube shaft 24 continues to rotate, so the protrusion 22 of the type ring spring 21 slides on the edge of the cutout groove 26 of the tube shaft 24 and rides on the outer periphery of the tube shaft 24. Allows rotation.

Type 12 in printing position with type wheel 14 stopped
prints on recording paper.

In the type wheel return stroke, the tube shaft 24 rotates in the direction of arrow B (the opposite direction in FIG. 4), which is the opposite direction to the type selection stroke, and the protrusion 22 falls into the notch groove 26 due to the spring force and engages. do.

Here, the rotary force from the tube shaft 24 is applied to the type ring 14 by the cutout groove 26. transmitted through the protrusion 22 and the opening 16 to the tube shaft 2
Rotates in sync with 4.

When the tube shaft 24 and the type wheel 14 return to the standby position, the stopper protrusion 20 provided on the type wheel moves to the external stopper 2.
Collision with 9 and stop.

The tube shaft 24 similarly hits a stopper (not shown) and stops.

The notch groove 26 of the tube shaft 24 collides with the protrusion 22 of the type ring spring 21 during the type ring return process, so that the type ring spring 21
The tip surface 22a in the axial direction of the protrusion 22 of the type ring spring 21 is shaped to prevent the type ring from coming off, and the type ring inertia load and A friction force (detent force) is applied to the type ring spring 21 so that the protrusion 22 of the type ring spring 21 does not come out of the notch groove 26 of the tube shaft due to the frictional load with the adjacent type ring or the viscous load of the ink. It is sloped at an angle.

In the type wheel return stroke, the foil type ring spring 21 only needs to have a spring force that causes the protrusion 22 of the type ring 21 to engage with the cutout groove 26 of the tube shaft 24.

The arcuate spring 23 of the type ring spring 21 is integrally connected to the outer ring portion at one end, and the spring portion is in a free state when the protrusion 22 is engaged, and no spring force is required to prevent the engagement from slipping away. be.

Therefore, the type ring spring 21 may have a small spring force, and if this spring force is reduced, the sliding friction load resistance when the protrusion 22 slides around the tube axis becomes very small, and the type ring 14 can be moved with small power. The tube shaft 24 can be driven.

To give a concrete example, a type ring spring 2 that appears in the type selection process.
The rotational load torque of the tube shaft 24 for moving the projection 22 of No. 1 to the outer periphery of the tube shaft 24 is about 10 gCrr1,
The rotational load torque of the tube shaft 240 when the protrusion 22 slides on the outer periphery of the tube shaft 24 is less than 3 gm1.

Although this is not the purpose of the present invention, as shown in FIG. 8, the ink supply is carried out through the slit 25 of the tube shaft 24, the side slit 17 of the type wheel 14, and the type body 11, regardless of whether the type wheel 14 is rotating or stopped. The ink permeates into the pores of the pores by a capillary phenomenon due to surface tension, reaches the type 12, and can be printed.

By implementing the present invention, it is possible to reduce the power of the motor, etc. for driving the type wheel and other rotating mechanisms around the tube shaft, contributing to labor savings and reductions in operating costs.

The type ring spring according to the present invention has the function of clamping the type body around the outer periphery of the type ring, so that the clamping collar 10, which is difficult to form as shown in FIG. 3, is not required.

In addition, since the type ring spring is composed of a thin disc-shaped member with the toughness required as a spring material, it is very effective for holding type bodies in type ring devices that require strict dimensional constraints in the girder direction. It is something.

As explained in detail above, the present invention uses the unique peripheral structure of the type ring spring 21 to reduce driving energy, facilitate the fixation of the type, and increase the fixing accuracy.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a conventional printing device. FIG. 2 is a central sectional view of the printing device in FIG. 1. FIG. 3 is a sectional view showing an example of the printing device shown in FIG. 1 in which the type body is held between the type wheels. FIG. 4 is a left side view showing one embodiment of the type wheel device according to the present invention. FIG. 5 is a front view of the type wheel device in FIG. 4. FIG. 6 is a right side view of the type wheel device in FIG. 4. FIG. 7 is a sectional view of the BOB in FIG. 6. FIG. 8 is an AOA sectional view in FIG. 6. FIG. 9 and FIG. 10 are diagrams in which FIG. 4 and FIG. 6 are made easier to see, respectively. DESCRIPTION OF SYMBOLS 11... Type font, 12... Type, 14... Type ring, 16... Opening, 18... Pin, 19... Serrated teeth, 21... Type ring spring, 22 ...protrusion, 23.
...Circular spring, 24...Tube shaft, 26...Notch groove.

Claims (1)

[Scope of utility model registration request] Rotation shaft 2 with a notch 26 along the thrust direction
4, and a typeface 11 in which a plurality of typefaces are integrally arranged on the outer periphery.
is externally fitted and rotates around the rotation shaft 24, and a type wheel 1'4 that slides along the outer periphery of the rotation shaft 24 fixed to the side surface of the type wheel 14. or, in a type ring device comprising a thin plate-shaped type ring spring 21 that engages with a notch 26 of the rotation shaft 24 and rotates integrally with the rotation shaft 24, the type ring spring 21 21 is the rotation shaft 2
4, and an outer ring area connected to the side surface of the type ring 14, and the outer ring area has a peripheral edge that is connected to the type body 11. A type wheel device characterized by having a structure in which the type wheel 14 is held together with a protrusion 19 of the type wheel 14 on the outer periphery of the type wheel 14.