Refillable ink ribbon cartridge for use in electronic typewriter

A refillable ink ribbon cartridge for use in an electronic typewriter which includes a housing, a feed spool member having symmetric C-shaped springs for slidably receiving and removing a changeable feed spool, a winding spool member having a lever and a lever opener for slidably inserting and removing a winding spool, and a jagged wheel whereby the used ink ribbon cartridge can be reused and maintains a constant tension on the ink ribbon between the feed and winding spools.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to a refillable ink ribbon cartridge for use 
in an electronic typewriter or a printer and more particularly, to an ink 
ribbon cartridge for use in an electronic typewriter which includes a 
changeable feed spool replaced through a side opening and a winding spool 
about which is wound a used ribbon which is taken out of the cartridge 
through a bottom opening of the cartridge, whereby the used cartridge can 
be reused without creating waste materials. 
2. Description of the Prior Art 
Various types of disposal ink ribbon cartridges are well known in the art. 
For example, in such disposal ink ribbon cartridges, the feed spool and 
the winding spool are operatively maintained the resilience of an ink 
ribbon by a feed spool spring as described in U.S. Pat. No. 4,406,554 to 
Nally et al and U.S. Pat. No. 4,655,623 to Gasser. However, such ink 
ribbon cartridges are incapable of allowing replacement of the feed spool 
and must be thrown away with the used ribbon after one use so as to create 
large amounts of waste materials. 
SUMMARY OF THE INVENTION 
Accordingly, it is an object of the present invention to provide a 
refillable ink ribbon cartridge for use in an electronic typewriter. 
Another object of the present invention is to provide an ink ribbon 
cartridge which includes a changeable feed spool replaced through a side 
opening and a winding spool about which is wound a used ribbon which may 
be removed therefrom through a bottom opening of the cartridge. 
A further object of the present invention is to provide a refillable ribbon 
cartridge which includes a feed spool member having symmetric C-shaped 
springs for slidably receiving and removing a feed spool, and a winding 
spool member having a lever and a lever opener for slidably inserting and 
removing a winding spool whereby the ribbon cartridge can be reused. 
Other objects and further scope of applicability of the present invention 
will become apparent from the detailed description given hereinafter. It 
should be understood, however, that the detailed description and specific 
examples, while indicating preferred embodiments of the invention, are 
given by way of illustration only, since various changes and modifications 
within the spirit and scope of the invention will become apparent to those 
skilled in the art from this detailed description. 
Briefly described, the present invention relates to a refillable ink ribbon 
cartridge for use in an electronic typewriter which includes a housing, a 
feed spool member having symmetric C-shaped springs for slidably receiving 
and removing a changeable feed spool, a winding spool member having a 
lever and a lever opener for slidably inserting and removing a winding 
spool, and a jagged wheel whereby the used ink ribbon cartridge can be 
reused and maintains a constant tension on an ink ribbon between the feed 
and winding spools.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Referring now in detail to the drawings for the purpose of illustrating 
preferred embodiments of the present invention, the refillable ink ribbon 
cartridge 1 as shown in FIG. 1-5 comprises a housing including a casing 
base 2, a front casing cover 3, a C-shaped top cover 13, a winding spool 
side wall 55, a bottom plate 30, a feed spool member including a feed 
spool 5, a winding spool member including a winding spool 6 disposed 
within the housing, and a drive roller 4 in the vicinity of the winding 
spool 6. The front casing cover 3 includes a hole 114 for checking a hub 
18 of the feed spool 5 in the ribbon cartridge 1 (FIG. 7) and is made of 
transparent materials such as plastic, glass, or the like. Also, guide 
pins 8, 9, and 10 are supported on the casing base 2 for passing an ink 
ribbon 7 therethrough from the feed spool 5 to the winding spool 6. The 
C-shaped top cover 13 is provided with a gulf 34 in the vicinity of the 
winding spool 6 for easily connecting the ink ribbon 7 to the winding 
spool 6 by the use of a finger. 
A feed spool side opening 14 is disposed on a feed spool side of the ribbon 
cartridge 1 for easily inserting and removing the feed spool 5 into and 
from the ribbon cartridge 1. The feed spool side opening 14 has a gulf 33 
for easily inserting the feed spool 5 into the ribbon cartridge 1. As 
shown in FIGS. 6 and 11, a C-shaped first feed spool spring 11 pivotably 
connected to a fixed pin 15 through a pivotal spring ring 110 disposed at 
one end thereof is alternatively engaged in spring holders 16 and 17. 
Also, the first feed spool spring 11 has a semi-circle 111 disposed around 
the center thereof and extends a spring arm 112 and a hook 12 at the other 
end thereof for passing the ink ribbon 7 therethrough and maintaining a 
constant tension on the ink ribbon 7 between the feed spool 5 and the 
winding spool 6. As shown in FIGS. 7 and 12, a C-shaped second feed spool 
spring 20 symmetrically disposed at the C-shaped first feed spool spring 
11 is pivotably connected to a fixed pin 21 through a pivotal spring ring 
210 thereof. Also the second feed spool spring 20 is provided with an end 
engagement 22 at one end thereof for readily engaging with a plurality of 
stoppers 23, 24, 25, and 26 disposed on the inside surface of the front 
casing cover 3 of the cartridge 1 for stopping the spring arm 22 between 
the stoppers 23 and 24, 24 and 25, or 25 and 26 so as to give a constant 
biasing force to the semi-circle 200 for tight positioning against the hub 
18 of the feed spool 5 (FIGS. 2 and 3). The second feed spool spring 20 
has a semi-circle 200 disposed around the center thereof and extends a 
spring arm 113. The spring arm 112 of the first feed spring 11 and the 
spring arm 113 of the second feed spring 20 define an angle of 60.degree. 
to 90.degree. therebetween (FIGS. 1 and 7). Thus, the feed spool 5 can be 
easily engaged between both semi-circles 111 and 200 of the first and 
second feed spool springs 11 and 20 through the hub 18 of the feed spool 
5. The hole 114 disposed on the front casing cover 3 can easily look and 
check whether the hub 18 of the feed spool 5 containing both semi-circles 
111 and 200 of the first and second feed spool springs 11 and 20 is 
located in the proper position or not. 
As shown in FIGS. 7, 8, 9, and 10, a fixed pin 52 supported on the casing 
base 2 receives a pivotal spring ring 54 of L-shaped spring 50. The spring 
50 is engaged in a hub 60 of the winding spool 6 at one end 51 and biased 
against an L-shaped lever 40 at the other end 53 thereof (FIG. 10). The 
lever 40 has an L-shaped lever end 41 for locking with an edge of a lever 
opener 28 by pushing the lever opener 28 into the inside of the cartridge 
1 in the direction indicated by an arrow from the open position shown in 
FIG. 7 to the closed position as shown in FIG. 8. Thereafter, when a 
finger stopper 29 of the lever opener 28 pushes into the outside of the 
ribbon cartridge 1, the lever 40 is released in the direction indicated by 
arrows from the closed position shown in FIG. 8 to the open position as 
shown in FIG. 9. Thus, the lever opener 28 is slidably engaged between the 
bottom plate 30 and both raised portions 45 and 46 (FIG. 4). 
As shown in FIG. 7, the driver roller 4 has a jagged wheel 44 for resisting 
the used ribbon 7 of the winding spool 6 and maintaining a constant 
tension on the ink ribbon 7 between the feed spool 5 and the winding spool 
6 so that the ribbon 7 from the feed spool 5 has a substantially constant 
resilient force. 
As shown in FIG. 13, the hub 18 of the feed spool 5 is provided with a 
global pin 151 disposed on the bottom plate 150 and a raised edge 152 
disposed on the top plate thereof for preventing both semi-circles 111 and 
200 of the first and second springs 11 and 20 from separating therefrom. 
The ink ribbon 7 is wound along a lower part 153 of the hub 18 of the feed 
spool 5. 
Referring in detail to FIGS. 14 and 15, there is illustrated an another 
embodiment of an ink ribbon cartridge 1 according to the present 
invention. Instead of the first feed spool spring 11 of FIG. 1, bridges 
221 and 222 and a stop bridge 223 maintain the position of the feed spool 
5 for slidably inserting the feed spool 5 into the cartridge through a 
guide road 229 disposed between both bridges 221 and 222 (FIG. 15). 
The plurality of stoppers 23, 24, 25, and 26 are disposed on the inside 
surface of the front casing cover 3 for stopping the spring arm 22 between 
the stoppers 23 and 24, 24 and 25, or 25 and 26 so as to give a constant 
biasing force to the semi-circle 200 for tight positioning against the hub 
18 of the feed spool 5. 
Referring in detail to FIGS. 16 and 17, there is illustrated an additional 
embodiment of an ink ribbon cartridge according to the present invention. 
In the ink ribbon cartridge 1 of FIG. 1, the C-shaped first feed spool 
spring 11 is removed and the C-shaped second feed spool spring 20 is 
disposed on the front casing cover 3. A fixing pin 321 is supported on the 
front casing cover 3 for pivotably receiving the spring ring 210 of the 
second feed spool spring 20. A plurality of stoppers 323, 324, 325, and 
326 are supported on the front casing cover 3 for stopping the spring arm 
22 between the stoppers 323 and 324, 324 and 325, or 325 and 326 so as to 
give a constant biasing force to the semi-circle 200 for tightly keeping a 
portion disposed below the raised edge 152 of the hub 18 of the feed spool 
5. The feed spool 5 can be slidably inserted into the ribbon cartridge 1 
through a space 301 disposed in the right side portion of the front casing 
cover 3. At that time, the raised edge 152 of the hub 18 and the second 
feed spool spring 20 come up over the front casing cover 3 (FIG. 17). 
Referring in detail to FIGS. 18 and 19, there is illustrated another 
additional embodiment of an ink ribbon cartridge according to the present 
invention. In the ink ribbon cartridge of FIGS. 16 and 17, the C-shaped 
second feed spool spring 20 is disposed on the inside surface of the front 
casing cover 3. Accordingly, the fixing pin 321, and stoppers 323, 324, 
325, and 326 are supported on the inside surface of the front casing cover 
3. At this time, the raised edge 152 of the hub 18 comes up over the front 
casing cover. However, the second feed spool spring 20 does not come up 
over the front casing cover 3. 
According to the present invention, the ink ribbon cartridge operates as 
follows: 
As shown in FIGS. 1 and 12, the feed spool 5 is inserted into the space 
between the first feed spool spring 11 and the second feed spool spring 20 
for tightly mating the upper portion 154 of the hub 18 of the feed spool 5 
with both semi-circles 111 and 200 of the spool springs 11 and 20. At this 
time, the spring arm 22 engages in the space between the stoppers 23 and 
24, 24 and 25, or 25 and 26 according to the tension of the second feed 
spool spring 20. For example, when the spring arm 22 is moved from the 
stopper 23 in the direction indicated by an arrow C, the extension arm 
spring 113 is moved to the upper portion in the direction indicated by an 
arrow D as shown in FIG. 12 so that the pressure of the upper portion 154 
of the hub 18 of the feed spool 5 is increased for tightly keeping the 
feed spool 5 in the space between semi-circles 111 and 200. Thus, 
according to the position of the spring arm 22 it is determined how tight 
the semi-circle 200 of the second feed spring 20 holds the hub 18 of the 
feed spool 5. In addition, the jagged wheel 44 controls the speed of 
rotation of the winding spool 6. Thus, by both of the above-mentioned 
factors, the ink ribbon 7 to be used for typing is maintained at a 
constant tension. 
The ink ribbon 7 from the feed spool 5 is connected to the winding spool 6 
through the hook 12, and guide pins 8, 9, and 10. At this time, it is easy 
for the finger to attach the end of ink ribbon 7 to the hub 18 of the 
winding spool 6 through the gulf 34 (FIG. 1). Also, at this time, the 
lever 40 is locked by the lever opener 28. 
When the ink ribbon 7 of the feed spool 5 is finally moved to the winding 
spool 6 as shown in FIG. 7, the exhausted feed spool 5 can be easily 
exchanged for a new one, and the winding spool 6 wound by the used ribbon 
77 may also be removed from the cartridge 1. That is, when the finger 
stopper 29 is pushed into the outside of the cartridge 1, the lever end 41 
is released from the lever opener 28 and the lever 40 can be pivotably 
moved from the original position to position A (dashed lines) in the 
direction indicated by an arrow as shown in FIG. 7. Also, the winding 
spool 6 wound by the used ribbon 77 is moved the original position at 
position B (dotted lines) in the direction indicated by an arrow as shown 
in FIG. 7. At this time, the used ink ribbon 77 can be readily taken out 
of the winding spool 6. Thereafter, the frame of the winding spool 6 can 
be reused by inserting it into the ribbon cartridge 1 and locking the 
lever opener 28. Accordingly, the used ribbon cartridge 1 can be easily 
reused. 
As shown in FIG. 14, another embodiment of the ribbon cartridge according 
to the present invention operates as follows: 
After the second feed spool spring 20 is moved down in the direction 
indicated by an arrow from the original position to the position M (dotted 
lines) as shown in FIG. 14, the feed spool 5 is inserted into the ribbon 
cartridge 1 through the feed spool side opening 14 and tightly contacted 
to the corner of the L-shaped bridges 221 and 223. At this time, the 
second feed spool spring 20 is returned to the original position and the 
extension arm spring is engaged within the space between the stoppers 25 
and 26. Also, in order to give a tension to the ink ribbon 7, the ink 
ribbon 7 has to pass a spring end 227 of a pivotal spring 225 about a 
fixing pin 228 the other end spring 226 of the pivotal spring 225 biasing 
against the top cover 13. 
As shown in FIGS. 16 and 17, the additional embodiment of the ribbon 
cartridge according to the present invention operates as follows: 
After the second feed spool spring 20 is moved into the upper position, the 
feed spool 5 is inserted into the ribbon cartridge 1 through the space 
301. Thereafter, the second feed spool spring 20 is tightly contacted to 
the portion disposed below the raised edge 152 of the hub 18 of the feed 
spool 5 and the extension arm spring 22 is engaged in the space of the 
stoppers 323 and 324 supported on the rear casing cover 3 (FIG. 16). At 
this time, the feed spool hub 18 comes up over the rear casing covers 3. 
As shown in FIGS. 18 and 19, the other additional embodiment of the ribbon 
cartridge according to the present invention operates same as the ribbon 
cartridge in FIGS. 16 and 17. Only the second feed spool spring 20, the 
fixing pin 321, and the stoppers 323, 324, 325, and 326 are disposed 
within the ribbon cartridge. 
The invention being thus described, it will be obvious that the same may be 
varied in many ways. Such variations are not to be regarded as a departure 
from the spirit and scope of the invention, and all such modifications as 
would be obvious to one skilled in the art are intended to be included in 
the scope of the following claims.