JPH0452059Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a rear cover attaching/detaching device for detachably attaching a rear cover for opening and closing the rear opening of the main body of a printing device such as a typewriter.

"Prior Art and its Problems" In a conventional printing device, the rear cover is screwed to the main body. For this reason, if a circuit board with electronic circuits etc. mounted inside the rear cover is attached, screws must be removed each time the circuit elements on the circuit board are replaced or inspected. It was inconvenient.

The purpose of this invention is to enable the rear cover to be easily installed and removed from the back of the printer body, and to
The functions of the printer main body can be expanded or changed by detachably attaching an external electronic component cartridge to the outside of the rear cover, and when the rear cover is attached to the rear of the printer main body, the inner surface of the rear cover can be attached to the printer main body. The purpose is to provide electrostatic shielding in the same way as the inner surface.

"Means for Solving Problems" This invention is based on the sixth and seventh
To explain with reference to the figure, a circuit board 5 on which electronic circuits etc. are mounted is attached to the inside of the rear cover 4 that opens and closes the rear opening of the printing device main body 1, and
An elastic engagement piece 10 having a cam portion 10a is provided on the upper edge of the rear cover, and a rear cover holder for receiving the engagement piece 10 is provided on the rear edge of the printer main body 1. A window 9 is provided, and a cam receiving portion 9a that engages with the cam portion 10a is provided inside the rear cover holding window 9, and a regulating portion 3 that regulates the lower side of the rear cover 4 is provided below the printer main body 1.
Provide a.

Further, on the outside of the rear cover 4, there is provided a cartridge holding part for removably holding the external electronic component cartridge 18, and on the inner surface of the rear cover 4, when the rear cover 4 is attached to the printing apparatus main body 1, A metal shield plate 8 is attached which contacts the side metal shield plate 7. Further, the circuit board 5 includes a rear cover 4.
A connector 6 is provided which is electrically connected to an external electronic component cartridge 18 through a slot 14 provided in the main body.

"Function" The lower part of the rear cover 4 is restricted by the restriction part 3b,
When the engaging piece 10 is forcibly fitted into the rear cover holding window 9 against its elastic force and the cam portion 10a is engaged with the cam receiving portion 9a, the rear cover 4 is held on the printer main body 1. In this state, if the engaging piece 10 is pushed downward against its elastic force, the cam portion 10
a comes off from the cam receiving part 9a. Thereafter, by pulling out the engaging piece 10 from the rear cover holding window 9, the rear cover 4 can be removed from the printing apparatus main body 1 by simply lifting it.

Furthermore, when the rear cover 4 is attached to the printer body 1, the metal shield plate 8 attached to the inner surface of the rear cover 4 comes into contact with the metal shield plate 7 on the printer body 1 side, and is continuous with the shield plate 7. Constitutes an electrostatic shielding surface or a magnetic shielding surface.

Further, an external electronic component cartridge 18 can be detachably attached to the outside of the rear cover 4. When this is attached, the external electronic component cartridge 18 and the electronic circuits etc. on the circuit board 5 of the rear cover 4 can be connected to the slot of the rear cover 4. 14 through the connector 6, the functions of the printer main body can be easily expanded or changed even after the rear cover 4 is closed.

"Embodiment" Hereinafter, an illustrated embodiment in which the present invention is applied to a typewriter will be described in detail.

In Fig. 1, a typewriter body (printing device body) 1 has an upper cover 2 made of synthetic resin.
The top, bottom, left and right side surfaces are covered by a bottom cover 3 and a rear opening is opened and closed by a dish-shaped rear cover 4 also made of synthetic resin.

The rear cover 4 is detachably attached to the upper cover 2 and the bottom cover 3, and a circuit board 5 is attached to the inside thereof as shown in FIG. 2. The circuit board 5 includes a plurality of female connectors 6 for connecting to male connectors 22 of a plurality of external electronic component cartridges 18 as described later.
They are fixed to the left and right at predetermined intervals, and various electronic circuits (not shown) are mounted thereon. Metal shield plates 7 and 8 for electrostatic shielding etc. are respectively attached to the inner bottom surface of the bottom cover 3 and the inner surface of the rear cover 4, and the raised rear end 7a of the former shield plate 7 and the latter Lower end 8a
and are in contact with each other and electrically connected when the rear cover shield is closed.

To attach the rear cover 4, insert the lower end side part 4a between the restriction part 3b which is inside the peripheral wall part 3a of the bottom cover 3 and protrudes from the inner bottom surface of the bottom cover 3, and then attach the rear cover 4. 4 is joined to the rear edge 2a of the upper cover 2. To maintain this state,
Approximately square rear cover holding windows 9 are provided on the rear edge 2a of the upper cover 2 at two locations on the left and right sides.
Further, on the upper edge 4b of the rear cover 4, there are correspondingly elastic Z-shaped left and right engaging pieces 10.
are integrally protruded. Left and right cam receivers 9a are located on both left and right sides of the lower side of the rear end of the rear cover holding window 9.
are integrally protruded inwardly, and the engagement piece 10 is integrally formed with substantially triangular left and right cam portions 10a that engage with these cam receiving portions 9a. When the left and right engaging pieces 10 are forcibly inserted into the left and right rear holding windows 9 from their rear ends, the cam portions 10a are inserted into the cam receiving portions 9a.
While slidingly contacting the lower surface of the cam holder 9a, the cam holder floats up inside the cam receiving portion 9a and engages with the cam receiving portion 9a. By this,
The rear cover 4 is held by the upper cover 2 and the bottom cover 3. Furthermore, in order to lock this holding state, as shown in FIGS. 7 and 8, a lock protrusion 11 having a lock recess 11a is integrally protruded at the center of the rear edge 2a of the upper cover 2. A lock piece 12 is attached to the lower side of the center of the upper edge 4b of the rear cover 4 so as to be slidable left and right, and the knob 12a of the lock piece 12 can be slid along a guide groove 13. There is. When the locking piece 12 is slid to the right in the figure and its right end is fitted into the locking recess 11a, the rear cover 4 pushes down the left and right engaging pieces 10 against the elastic force and cams. Even if the engagement between the portion 10a and the cam receiving portion 9a is disengaged, the cam receiving portion 9a cannot be opened.

To open the rear cover 4, after removing the lock piece 12 from the lock recess 11a, push down the left and right engaging pieces 10 and push the cam part 10a into the cam receiving part 9.
It is very easy to open and close the rear cover 4 by simply removing it from the rear cover 4 and lifting it up.

The rear cover 4 is also provided with a slot 14 for receiving a portion of the male connector 6 at a corresponding position, and a slightly laterally elongated cartridge locking recess 15 is formed slightly above the slot 14. As shown in FIG. 4, this cartridge locking recess 15 has an inner surface 15a inclined so as to gradually become deeper, and its inner end opens inward of the rear cover 4 and becomes a hook receiving part 15b. ing. Further, a shield plate connection port 16 is provided at a position slightly below the slot 14 corresponding to the upper end of the shield plate 8, and a cartridge holding hole 17 is provided at a position further below this, facing the upper edge of the peripheral wall portion 3a of the bottom cover 3.
is drilled.

On the other hand, an external electronic component cartridge 18 which is appropriately selected and loaded into the typewriter main body 1 as a so-called optional product has a circuit board 21 disposed inside front and back covers 19 and 20 made of synthetic resin that match each other as shown in FIG. A male connector 22 is fixed thereto, and an electronic circuit (not shown) is mounted thereon. Note that this typewriter is provided with a plurality of types of cartridges as will be described later, but these will be collectively referred to as cartridges 18 below.

As shown in FIGS. 2 and 3, a locking piece 23 is attached to the lower side of the upper wall of the back cover 19 within the cartridge 18 so as to be slidable left and right. This locking piece 23 has a hook 23a that projects outward from a horizontally long hole in the rear wall of the back cover 19, and a knob 23b that projects outwardly from a horizontally long hole in the upper wall of the back cover 19. are doing. Further, this locking piece 23 is biased to the right by a spring 24, and a resilient braking protrusion 2 protrudes from the bottom.
Stopper 2 with 3c fixed to back cover 19
By engaging the left side of 5, it is normally held at the intermediate position shown by the solid line in FIG. Braking protrusion 2
When the locking piece 23 is forcibly slid to the right until the stopper 3c passes the stopper 25, the locking piece 23 is held at the right end.

In addition, the back cover 19 of the cartridge 18 includes
Left and right engaging protrusions 26 are integrally protruded from the lower edge thereof, a protruding window 27 is formed at the upper part to allow the pins 22a of the male connector 22 to protrude outward, and a shield plate 28 is attached to the inner surface. has been done. A protrusion 28a at the upper end of the shield plate 28 partially projects outward from a window hole 29 formed in the back cover 19.

To load the cartridge 18 configured in this way into the typewriter body 1, the left and right engaging protrusions 26 are inserted into the left and right cartridge holding holes 17 of the rear cover 4 diagonally from above, and then the cartridge 18 is inserted into the rear cover 4. While fitting the male connector 22 into the female connector 6 so as to press it against the outer surface of the cartridge 4, the locking piece 23 is fitted into the cartridge locking recess 15, and the locking piece 23 is forcibly slid to the right end. Then, the hook 23a is engaged with the hook receiving portion 15b as shown by the solid line in FIG.
As a result, the cartridge 18 is removed from the rear cover 4.
While in close contact with the outer surface of the rear cover 4, movement in either the left-right or front-back directions is restrained, and the rear cover 4 is firmly held. In this state, the protrusion 28a at the upper end of the shield plate 28 in the cartridge 18 protrudes inward from the shield plate connection port 16 of the rear cover 4 and comes into pressure contact with the upper end of the shield plate 8. It is also electrically connected to the shield plate 7 of the bottom cover 3 via it.

To remove the cartridge 18, the locking piece 23 is forcibly slid to the left. Along with this sliding, the hook 23a slides along the inclined inner surface 15a of the cartridge locking recess 15 as shown by the chain line in FIG.
is gradually displaced outward of the cartridge locking recess 15, and accordingly, the upper part of the cartridge 18 is pushed by the hook 23a and gradually separates from the outer surface of the rear cover shield, and the male and female connectors 6, 22
will be uncoupled. After this, the cartridge 18 can be completely removed from the rear cover 4 by simply lifting it.

In this typewriter, there are four cartridges 18, as shown in FIG. Seed cartridges are prepared, and these are loaded into corresponding loading portions of the rear cover 4.

"Effects of the Invention" As described above, according to the cartridge attachment/detachment device of the present invention, the lower part of the rear cover is regulated by the regulating part on the lower side of the printing device main body, and the engaging piece of the rear cover is
By fitting the rear cover into the rear cover holding window of the printing device main body and engaging the cam portion with the cam receiving portion provided inside the rear cover holding window, the rear cover can be held on the printing device main body, and the engaging piece can be held by its elastic force. After pushing downward against the pressure to remove the cam part from the cam receiver, you can remove it from the printing device by simply lifting the rear cover. This makes installing and removing the rear cover extremely easy. It is easy to replace or inspect electronic circuits on the attached circuit board.

Also, when the rear cover is attached to the printing device main body, the metal shield plate attached to the inner surface of the rear cover comes into contact with the metal shield plate on the printing device main body, so the inner surface of the rear cover is continuous with the inner surface of the printing device main body. It can be an electrostatic shield surface or a magnetic shield surface.

Furthermore, an external electronic component cartridge can be removably attached to the outside of the rear cover.
When this is installed, the external electronic component cartridge and the electronic circuits on the circuit board of the rear cover can be electrically connected through the slot of the rear cover using a connector, so the functions of the printer itself can be easily extended even after the rear cover is closed. or can be changed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of the entire typewriter, Fig. 2 is an enlarged vertical cross-sectional view showing the state in which an electronic component cartridge is attached, and Fig. 3 is an internal view of the cartridge. Figure 4 is a cross-sectional view showing the relationship between the cartridge locking recess and the locking piece that locks the typewriter to the rear cover, Figure 5 is a rear view of the entire typewriter, and Figure 6 is an enlarged view showing how the rear cover is attached. Fig. 7 is a partial plan view of the part that holds it on the upper cover, Fig. 8 is a longitudinal sectional view.
The figure is a sectional view of the lock portion. 1...typewriter body (printing device body), 3
a... Regulation part, 4... Rear cover, 5... Circuit board, 6... Female connector, 7, 8... Shield plate,
9...Rear cover holding window, 9a...Cam receiver, 1
0... Engaging portion, 10a... Cam portion, 14... Slot, 15... Cartridge locking recess, 17...
Cartridge holding holes, 18, 18a to 18d...
External electronic component cartridge.

Claims (1)

[Scope of utility model registration request] A circuit board 5 on which electronic circuits and the like are mounted is installed inside the rear cover 4 that opens and closes the rear opening of the printing device main body 1.
At the same time, an elastic engagement piece 10 having a cam portion 10a is provided on the upper edge of the rear cover 4, and a resilient engagement piece 10 with a cam portion 10a is provided on the rear edge of the printer main body 1. A rear cover holding window 9 for receiving the piece 10 is provided, a cam receiving part 9a that engages with the cam part 10a is provided inside the rear cover holding window 9, and a lower part of the rear cover 4 is provided below the printer main body 1. A regulating part 3a is provided on the outside of the rear cover 4, and a cartridge holding part for removably holding the external electronic component cartridge 18 is provided on the outside of the rear cover 4.
When the rear cover 4 is attached to the printing device main body 1, a metal shield plate 8 is attached that comes into contact with the metal shield plate 7 on the printing device main body 1 side, and the circuit board 5 is also fitted with a slot provided in the rear cover 4. 1. A rear cover attaching/detaching device for a printing device, characterized in that a connector 6 is provided to be electrically connected to an external electronic component cartridge 18 through a connector 14.