JPH0611804Y2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a portable printer in which a battery is housed.

[Conventional technology]

Generally, as the power source of the printing apparatus, a voltage of 100 V AC which is step-down rectified is used. When such a printing device is made portable, the step-down transformer is used by replacing it with a battery.

However, such a conventional portable printer cannot be miniaturized because the battery occupies a large volume.

For this reason, a printing apparatus in which a battery is housed in a platen to achieve miniaturization is disclosed in, for example, Japanese Utility Model Laid-Open No. 54-89922.

However, in the printing apparatus disclosed in Japanese Utility Model Laid-Open No. 54-89922, since the battery housed in the platen rotates with the rotation of the platen, the weight of the battery adds to the weight of the platen, which adversely affects the operation of the platen. May be given. Further, since the platen itself is removed when the battery is replaced, the battery replacement becomes complicated.

[Problems to be solved by the invention]

As described above, in the case of the printer disclosed in Japanese Utility Model Laid-Open No. 54-89922, the battery is attached and detached from the end portion of the platen in the axial direction, and therefore the platen must be attached and detached each time the battery is replaced. However, there is a problem that the replacement operation becomes complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a portable printer which does not adversely affect the operation of the platen and which allows easy battery replacement and miniaturization.

[Means for solving problems]

The present invention relates to a printing apparatus having a battery case for accommodating a battery in a cylindrical platen that rotates with the feeding operation of printing paper, wherein the battery case is non-rotating when the platen is rotated. An opening formed on the surface of the platen facing the inner surface of the circumferential surface for attaching and detaching the battery, and an opening formed on the circumferential surface of the platen corresponding to the opening of the battery case,
The platen is provided with an openable and closable lid which is detachably attached to the opening of the platen and becomes substantially flush with the circumferential surface of the platen when closed.

[Action]

The present invention makes it possible to reduce the size of the entire printing apparatus by accommodating the battery in the platen that occupies a large volume and is not used except for the surface thereof, and does not require an extra space. . Further, by providing the battery case that maintains the non-rotating state even when the platen rotates for the paper feeding operation, the weight of the battery is not added to the platen, and the operation of the platen is not adversely affected. Further, an opening is formed on a surface of the battery case facing the inner surface of the platen circumferential surface, an opening is formed on the platen circumferential surface corresponding to the battery case opening, and the platen is closed when the platen is closed. Since it is flush with the circumferential surface of the, the platen is not adversely affected, and it is not necessary to attach and detach the platen when the battery is replaced, making it easy to replace the battery and attaching the platen more than necessary. It can be simplified because no weight is added.

〔Example〕

An embodiment of the printing apparatus of the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a cylindrical platen, and the platen 11
A plurality of printing paper feed pins 15 are planted on the outer peripheral surface near both ends of the. An opening 16 for replacing the battery is provided in the central portion of the circumferential surface of the platen 11.
A lid 17 is detachably fitted to the platen 11 so as to be flush with the outer circumferential surface of the platen 11.

Further, a gear 19 is integrally fixed so as to cover one end opening of the platen 11, and the gear 19 has a diameter larger than the outer diameter of the platen 11.

Further, a battery case 20 is provided in the platen 11,
The battery case 20 is formed of an insulating material into a cylindrical shape. The platen is attached to the circumferential surface of the battery case 20, that is, the surface facing the inner surface of the platen 11.
A similar opening 21 is provided in a portion of the opening 11 that faces the opening 16. Further, tubular shaft portions 22 are integrally provided at the shaft center portions of both end surfaces of the battery case 20, respectively,
The shaft portion 22 on the left side in the drawing penetrates the left end surface of the platen 11, and the shaft portion 22 on the right side in the drawing penetrates the center portion of the gear 19 and projects to the outside.

Further, a plurality of batteries 12 are provided in series in the battery case 20, and coil springs 24 are provided on the inner surfaces of both ends of the battery case 20 so as to make pressure contact with the electrodes of the battery 12, and the coil springs 24 are electrically connected. The terminal 13 thus formed penetrates the tubular shaft portion 22 and projects to the outside. Further, of the outer peripheral surface of the tubular shaft portion 22, the portion penetrating the illustrated left end surface of the gear 19 and the platen 11 is a circumferential surface, and the rotation of the platen 11 and the gear 19 integrated with the platen 11 is allowed, As shown in FIG. 2, an engaging surface 22a having a part of the circumference cut away is provided at the portion deviated from this, and the cross section is substantially D-shaped.

Then, as shown in FIG. 2, the above-mentioned substantially D-shaped portion of the shaft portion 22 is mounted in the recess 27 provided in the main body frame 26 on the side surface of the printer main body 25. Further, protrusions 28 are provided on both sides of the recess 27, and an elastic body 29 is stretched between the protrusions 28 and the upper surface of the shaft portion 22 in the drawing so that the shaft portion 22 is moved when the printer main body 25 is moved. Is held so as not to come off from the recess 27.

On the other hand, 31 is a motor shaft gear, and this motor shaft gear 31 meshes with a gear 19 via a gear train 32, and the rotation of this motor shaft gear 31 rotationally drives the platen 11 integrated with the gear 19.

In the above structure, the platen 11 is rotationally driven by the rotation of the motor shaft gear 31 shown in FIG. The printing paper (not shown) is fed into the printer main body 25 from the lower right part of the platen 11 in FIG. 2, driven by the pin 15 shown in FIG. 1, and discharged after printing to above the bail 34 shown in FIG. It

Here, when the platen 11 rotates, the battery case 20 provided inside the platen 11 and the battery 12 inside the battery case 20 are held in a locked state by the recess 27 of the main body frame 26 via the shaft portion 22. Therefore, the moment of inertia of the platen 11 is almost the same as the conventional one, and the printing position is not disturbed. Further, the voltage of the battery 12 in the platen 11 passes through the coil spring 24 and the terminal 13 and then passes through the printer main body.
It is led out by a contact piece (not shown) provided in 25 and applied to an electric circuit.

[Effect of device]

According to the printer of the present invention, by accommodating the battery in the platen, it is possible to reduce the overall size without requiring an extra space. Since the battery case is non-rotating, the weight of the battery is added to the platen. Therefore, an opening is formed on the surface of the battery case facing the inner surface of the platen's circumferential surface without adversely affecting the operation of the platen, and an opening is formed on the platen's circumferential surface corresponding to the battery case's opening. Since it is formed so that the opening of the platen is flush with the circumferential surface of the platen when the platen is closed, the platen is not adversely affected, and the platen does not need to be attached or removed when the battery is replaced, making it easy to replace the battery. In addition, the platen can be attached easily because it is not loaded more than necessary.

[Brief description of drawings]

FIG. 1 is a sectional view showing a platen portion of an embodiment of a printing apparatus according to the present invention, and FIG. 2 is a partially cutaway side view of the printing apparatus according to the present invention. 11 …… Platen, 12 …… Battery, 16 …… Opening, 17 ……
Lid, 20 …… Battery case, 21 …… Opening.

Claims (1)

[Scope of utility model registration request] 1. A printing apparatus having a battery case for accommodating a battery in a cylindrical platen that rotates with the feeding operation of printing paper, wherein the battery case is non-rotating when the platen rotates. An opening formed on the surface of the platen facing the inner surface of the platen for attaching and detaching the battery; an opening formed on the platen's peripheral surface corresponding to the battery case opening; And a lid which is detachably attached to the opening and which is substantially flush with the circumferential surface of the platen when the lid is closed.