JPS6056755A - Printing device - Google Patents

Abstract

PURPOSE:To eliminate a vibration after equipping of a roll paper and prevent said paper from coming off a holder by providing an engaging part, which engages with a cover in a condition of closing a roll paper cover, in a large diameter part of a movable arm in a printing device with a roll paper holder. CONSTITUTION:A small diameter part 13 at one end of a movable arm 12 for a roll paper 20 is fitted to a guide wall 14 of a main body case 8, while the tip end 15 of said diameter part 13 is formed like a hook and determines limits of movement of the movable arm 12 in B direction. Under a condition of opening a roll paper cover 9, the tip of a fixed arm is fitted in one fitting hole of the roll paper 20, and subsequently, a projection part 19 of the movable arm 12 is fitted and held in the other fitting hole by elastic force of a spring 18. The roll paper cover 9 is closed in this condition. Thus, when the movable arm 12 moves in A direction, since its engaging projection part 16a is engaged with a side wall 9a of the roll paper cover 9, the roll paper 21 is not moved even if the force in A direction is applied on it and there is no fear of the roll paper coming off a position of equipping.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to all printing devices having a roll paper holder.

(Prior Art) Fig. 1 shows a conventional example of a roll paper holder, in which a holder shaft 2 is passed through a roll paper 1, and a case 3 of a printing device is
It's stuck in. However, in the above-mentioned conventional example, there is a drawback that the holder shaft is separated from the case 3 and there is a risk of loss.

Therefore, a mechanism as shown in FIG. 2 has been proposed. In the embodiment shown in FIG. 2, a fixed arm 4 and a movable arm 5 are used.
The fixed arm 4 is fixed to the case 3. The movable arm 5 is indicated by arrow A.
, it is possible to slide in the direction of the force indicated by the arrow, and is always urged in the direction B by the spring 7. Note that the movement in the direction of arrow B is restricted by the wooden board 5b of the movable arm 5 serving as a hook and meshing with the guide 6.

The above-mentioned spring 7 is attached between the step portion 5C of the movable arm 5 and the guide 6. When loading the roll paper 1, the movable arm 5 is pressed in the direction of the arrow A, and after the roll paper 1 is loaded, the suppression in the direction of the arrow A is released. By pressing the spring 7 in the direction of arrow B, the roll paper 1 is held as shown in FIG.

By the way, in the conventional example shown in FIG. 2, if a pressing force in the direction of arrow A is applied to the movable arm 5 due to some reason such as vibration after mounting, the roll paper 1 cannot be maintained in the normal mounting state and becomes loose. In severe cases, roll paper
will come off.

(Objective) The present invention solves the drawbacks listed in "-" and aims to provide a printing device that does not cause the roll paper to wobble due to vibrations etc. after being attached to the roll paper, and does not come off the paper holder. .

(Example) FIG. 3 shows a printing device which is an embodiment of the present invention.

A print head (not shown), a platen, etc. are housed in the main body case 8, and printing is performed on the paper pulled out from the roll paper based on print information. Reference numeral 9 denotes a transparent roll paper cover that covers the four parts 10 on which the roll paper is attached and the vicinity of the printing position, and the projections 11 formed on both sides
It is attached to the case body 8 so that it can be opened and closed in the direction of the arrow. Reference numeral 12 denotes a movable arm attached to one side of the recess 10 for the roll paper taker 4=j, and a fixed arm 4 similar to that in FIG. Take 4=I is cut.

FIG. 4 shows details of the movable arm 12. Movable arm 12
The narrow diameter part 13 at one end of the body fits into the guide wall 14 of the main body case 8, and the tip 15 of the narrow diameter part 13 fits into the guide wall 14 of the main body case 8.
is hook-shaped and determines the range of movement of the movable arm 12 in the B direction. The large diameter portion 16 of the movable arm 12 is formed coaxially and integrally with the small diameter portion 13, and also fits into the guide wall 17 of the main body case 8, and in this way, the movable arm 12 is moved in the entry direction. Or move in direction B. A spring 1 is provided between the guide wall 14 and the side surface of the large diameter portion 16.
8 is loaded, and constantly urges the movable arm 12 in the direction B. Due to the elastic force of the spring 18, the movable arm 1
The tip support protrusion 19 of No. 2 fits into the mounting hole 21 of the roll paper 20 17 and holds the roll paper together with a fixing arm (not shown). Furthermore, the tip of the large diameter portion 16 of the movable arm 12 is
An engaging protrusion 116a is integrally formed in a direction perpendicular to the longitudinal direction of the arm. The distance between the protrusion 16a and the side surface of the guide wall 17 is approximately equal to the thickness of the side wall 9a of the roll paper cover 9, or more precisely, it is slightly larger than the thickness of the side wall. Here, the roll paper cover 9 is opened and closed by the D
When the guide wall 9 moves in the C direction or C direction and is completely closed, the side wall 9a is interposed between the protrusion 16a and the guide wall 17 as shown in FIG.

Next, the operation of this embodiment will be explained.

First, with the roll paper cover 9 open, fit the tip of the fixed arm into one of the mounting holes of the roll paper 20, and then insert the protrusion 19 of the movable arm 12 into the other mounting hole of the roll paper 20. It is inserted and held by elastic force. From this state, the roll paper cover 9 is closed to obtain the state shown in FIG. 5. In this state, the movable arm 12 is in the position A.
When the engaging protrusion 16a engages with the side wall -9a of the roll paper cover 9, the roll paper 21 is moved in the A direction.
Even if a directional force is applied, the roll paper hardly moves,
Therefore, there is almost no wobbling, and there is no need to worry about it coming off the mounting position. Therefore, if printing is performed in this state, extremely stable printing will be achieved.

In the above embodiment, the protrusion 16a of the movable arm
is engaged with the side wall 9a of the roll paper cover,
The convex portion of the roll paper cover may be engaged with the concave portion of the movable arm, and in any case, any movement of the movable arm in the axial direction (direction A) of the roll paper may be restricted.

(Effects) As described above, according to the present invention, no operation other than the conventional roll paper loading operation is required, the number of parts does not increase, the mechanism does not become complicated, and therefore there is no increase in cost. It is possible to eliminate looseness and slippage of the installed roll paper.

[Brief Description of the Drawings] Figures 1 and 2 are explanatory diagrams of conventional examples, Figure 3 is an overall perspective view of the implementation of the present invention, and Figures 4 and 5 are movable arms for holding roll paper. FIG. 2 is an explanatory diagram showing the relationship between the roll paper cover and the roll paper cover, with an explanatory diagram showing the roll paper cover in an open state and an explanatory diagram showing the roll paper cover in a closed state, respectively. 9-111 Roll paper cover 12--1 Movable arm 1
6a---Engagement protrusion 18-1---Spring 20---
a roll of paper

Claims (1)

[Claims] In a printing device equipped with a roll paper holder and a roll paper cover, the roll paper cover engages with the roll paper force /<- in the closed state of the roll paper holder to prevent it from coming off from its mounting position. A printing device characterized by being provided with an engaging portion.