JP2000062303A - Braking device for ribbon cartridge and ribbon cartridge provided with the same - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a braking device in a ribbon cartridge which can stabilize a back tension applied to an ink ribbon with a simple structure, and a ribbon cartridge provided with the braking device. SOLUTION: In a cartridge case 31, a ribbon provided with a feeding spool 210 for feeding out an ink ribbon 200, an axial projection 72 for holding the feeding spool 210, and braking mechanisms 73, 75 for braking the rotation of the feeding spool 210. In the braking device for the cartridge, the braking mechanisms 73 and 75 include a sliding contact piece portion 73 having a spring property formed by removing a part of the shaft-like protrusion 72 in the “U” shape in the axial direction, and a shaft-like protrusion 72. And a spring 75 that urges the leading end of the sliding contact piece 73 toward the inner peripheral surface of the payout spool 210, and the leading end of the sliding contact piece 73 is Is provided with a sliding contact surface 73c having a shape complementary to the inner peripheral surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for a ribbon cartridge that applies back tension to an ink ribbon and a ribbon cartridge including the braking device.

[0002]

2. Description of the Related Art Conventionally, as a ribbon cartridge of this type, a ribbon cartridge described in Utility Model Registration No. 2564763 is known. This ribbon cartridge contains a transparent tape for printing and a double-sided adhesive tape attached to the printing surface of the transparent tape, and an ink ribbon for printing is provided on the feeding core and the winding core. It is housed in a wound state. The driven-side feeding core is rotatably supported by a core shaft protruding from the inner surface of the cartridge case, and its rotation is applied by a torsion spring mounted in the hollow portion of the core shaft so as to apply back tension to the ink ribbon. It is supposed to be braked. In this case, a through hole is formed in a part of the core shaft, and the ring portion of the torsion spring projects from the through hole to urge the payout core in the axial direction. As a result, when the payout core rotates, the ring portion pressed against this strongly slides against the inner surface of the payout core, and the rotation of the payout core is braked.

[0003]

In such a conventional ribbon cartridge, since the ring portion of the torsion spring is in point-contact with the inner surface of the pay-out core, the circularity of the inner peripheral surface of the pay-out core is reduced. Due to subtle unevenness, there were problems that the braking force fluctuated significantly, and that the torsion spring caused vibrations. As a result, the fluctuation of the back tension applied to the ink ribbon becomes large, and the print quality deteriorates.

An object of the present invention is to provide a braking device for a ribbon cartridge which has a simple structure and can stabilize the back tension applied to the ink ribbon, and a ribbon cartridge including the braking device.

[0005]

SUMMARY OF THE INVENTION A ribbon cartridge braking device according to the present invention includes a delivery spool for delivering an ink ribbon, a hollow shaft-like projection for rotatably holding the delivery spool, and a delivery spool. In a braking device for a ribbon cartridge provided with a braking mechanism for braking rotation, the braking mechanism has a spring-like sliding contact piece portion formed by removing a part of an axial protrusion in a "U" shape in the axial direction. And a spring that is inserted into the hollow portion of the shaft-shaped projection and urges the tip of the sliding contact piece toward the inner peripheral surface of the pay-out spool. It is characterized in that it is provided with a sliding contact surface having a shape complementary to the inner peripheral surface.

According to this structure, the feeding spool whose rotation is braked is biased by the spring through the sliding contact piece formed on a part of the shaft-like projection, and the tip of the sliding contact piece is formed. Since the portion (sliding contact end) is formed on the sliding contact surface having a shape complementary to the inner peripheral surface of the delivery spool, the spring force applied for braking has a relatively large area and the inner periphery of the delivery spool. Acts evenly on the surface. For this reason, even if there are subtle irregularities on the inner peripheral surface of the pay-out spool, the spring force is not concentrated on a part, and the spring force can be uniformly and stably applied to this.

In this case, it is preferable that the sliding contact piece extends from the inner surface of one of the front and back sides of the cartridge to a substantially middle portion in the axial direction of the delivery spool.

According to this structure, the spring force can be applied to a substantially intermediate portion in the axial direction of the pay-out spool, so that the rotational shake of the pay-out spool can be minimized.

In these cases, it is preferable that the shaft-shaped projection is formed integrally with the cartridge case.

According to this structure, the shaft-like projection and the sliding contact piece can be easily formed.

In these cases, it is preferable that the hollow portion of the shaft-like projection is formed with a locking projection for locking the spring inserted therein in a retaining state.

According to this structure, it is possible to prevent the spring inserted into the hollow portion from easily coming off due to an impact applied to the cartridge case. Also,
When the spring is inserted, the spring rides over the locking projections and is set, so that the set state can be confirmed and defective spring mounting can be prevented.

In these cases, the spring is made of a wire material and has a spring body bent into a substantially "U" shape and a ring portion serving as a biasing end obtained by bending one end of the spring body into a circle. It is preferable that

According to this structure, a spring exhibiting a stable spring force can be easily manufactured at low cost.

In this case, it is preferable that the hollow section of the shaft-like projection has a rectangular cross-sectional shape according to the insertion posture of the spring.

According to this structure, the spring can be inserted into the hollow portion without making a mistake in the inserting direction, and the posture of the spring can be stabilized in the inserted state.

The ribbon cartridge according to the present invention is defined in claim 1.
The ribbon cartridge according to any one of items 1 to 5 is provided.

According to this structure, a stable back tension can be applied to the ribbon cartridge.
Printing defects caused by the ink ribbon can be minimized.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A tape printer to which a braking device for a ribbon cartridge according to an embodiment of the present invention and a ribbon cartridge (tape cartridge) including the same are applied will be described below with reference to the accompanying drawings. To do. This tape printing device prints (prints) desired characters or figures on a printing tape mounted in the device via a tape cartridge and cuts a printed portion of the printing tape to a predetermined length. is there. More specifically, an adhesive label dedicated to MD (mini disk) is built in the printing tape, and the tape printing apparatus performs desired printing on the surface of this adhesive label. Then, the adhesive label after printing can be removed from the printing tape by MD.
It is attached to a predetermined position of (cassette).

FIG. 1 is an external perspective view of the tape printer with the lid open. As shown in FIG.
The printer main body 2 is composed of a printer cartridge 2 and a tape cartridge 3 which is detachably attached to the printer cartridge 2. The printer cartridge 2 has an outer shell formed by two upper and lower divided device cases 4. A keyboard 5 made up of various input keys 5a is arranged on the front upper surface of the device case 4, and a display 6 is provided on the rear upper surface.
An opening / closing lid 7 and a lid opening button 8 that opens the lid 7 are provided. Inside the opening / closing lid 7, the tape cartridge 3
The cartridge mounting portion 9 for mounting the tape cartridge 3 is formed in a recess, and the tape cartridge 3 is mounted and dismounted from the cartridge mounting portion 9 with the opening / closing lid 7 opened. Further, the cartridge mounting portion 9 is provided on the left side of the device case 4.
Is formed with a tape discharge port 10 that communicates with the outside of the device,
A tape cutter (not shown) for cutting the fed printing tape 100 faces the tape outlet 10. Further, a cutter button 11 for cutting the tape cutter is disposed on the left rear portion of the device case 4.

On the other hand, in the cartridge mounting portion 9, the print head 14 covered by the head cover 13 and the print head 1
4, the platen 15 facing the 4 and the take-up reel drive shaft 16
A guide protrusion 17 is provided upright to guide the mounting of the tape cartridge 3. The platen 15 and the take-up reel drive shaft 16 are provided below the cartridge mounting portion 9.
A tape feeding mechanism (not shown) for rotating the device is built in. Reference numeral 18 in the drawing denotes a head operation plate, and when the opening / closing lid 7 is closed, the head operation plate 18 causes the print head 14 to rotate to a printing position where the platen 15 is pressed to enable printing. .

After mounting the tape cartridge 3 in the cartridge mounting portion 9, the user inputs print information such as desired characters using the keyboard 5, and at the same time confirms the input result on the display 6 and edits it. next,
When printing is instructed via the keyboard 5, the tape feeding mechanism is driven to move the tape cartridge 3 to the printing tape 1.
At the same time when 00 is delivered, the print head 14 is driven,
Desired printing is performed on the adhesive label 110 portion of the printing tape 100. Alternatively, a mini disk player (not shown) is connected to the printing apparatus main body 2, the index data stored in the MD is read, the data is edited, and the adhesive tape 110 of the printing tape 100 is printed.

The printed portion of the printing tape 100 is continuously sent out from the tape discharge port 10 in parallel with the printing operation. In this way, when the desired printing is completed, the tape feeding mechanism stops the feeding operation. Here, when the user presses the cutter button 11 arranged on the left rear part of the device case 4, the tape cutter is operated and the printing tape 100 with the adhesive label is cut to a desired length.

As shown in FIGS. 2 and 3, the outer shell of the tape cartridge 3 is formed by a cartridge case 31 composed of an upper case 31a and a lower case 31b. The upper case 31a and the lower case 31b are engaged with each other in a snap-in manner (see FIGS. 4 and 5), and in the engaged state, separated by an adhesive seal 32 that describes the type of the tape cartridge 3 and the like. They are permanently joined (see Figure 2). The adhesive seal 32 is configured to be peelable, and by peeling it off and removing the upper case 31a, the used printing tape 100 or the like can be replaced.

Inside the cartridge case 31, the printing tape 100 wound around the tape core 120 in a roll shape is provided.
And the ink ribbon 200 whose one end is wound around the pay-out core 210 and whose other end is wound around the take-up core 220. The printing tape 100 is fed from the tape core 120, while the ink ribbon 200 is fed from the feeding core 2.
After being unwound from 10, the printing tape 100 overlaps and runs side by side, it is wound around the winding core 220.

Further, the printing tape 100 and the ink ribbon 2
An opening 34 facing the print head 14 and the platen 15 is formed in a portion overlapping 00 (see FIG. 10). When the tape cartridge 3 is mounted in the cartridge mounting portion 9, the print head 14 and the platen 15 are inserted into the opening 34 so as to sandwich the print tape 100 and the ink ribbon 200. At the same time, the winding core 22
The take-up reel drive shaft 16 is inserted into the hollow portion of 0. When the platen 15 and the take-up reel drive shaft 16 rotate in synchronization with each other, the printing tape 100 and the ink ribbon 200 are sent at the same time, and the print head 14 is driven to perform printing. The printing completed portion of the printing tape 100 is sent out from the tape delivery port 35 formed in the cartridge case 31 toward the tape ejection port 10 of the device case 4.

The printing tape 100 is formed by laminating a release tape (base tape) 102 on a printing tape body 101 with an adhesive material, and the printing tape body 101 is provided with a large number of adhesives by cutting a rectangular cut line. Labels 110 are formed side by side. That is, the adhesive label 110
Is formed by half-cutting a tape with so-called release paper. The parts other than the part where the adhesive label 110 is formed, that is, the left and right vertical non-label parts 111,
The printing tape 100 is a portion to be cut, and the upper and lower lateral non-label portions (label non-adhesion portions) 112 are the printing tape 10.
This is the part where 0 travel (feeding) is guided.

Also, the printing tape 10 wound in a roll shape.
A pair of front and back films 130, 130 are attached to both end surfaces of 0. The film 130 is the printing tape 100.
The printing tape 10 is attached to both end surfaces of the printing tape 100 with an adhesive force that does not affect the feeding of the printing tape 10
It prevents the dispersion of 0. Although the adhesive label 110 of the embodiment is to be attached (size) to the front and back surfaces of the MD cassette or cassette case, it is attached to the side surface of the MD cassette separately from the printing tape 100. Printing tape with a long and narrow adhesive label for
It is prepared to be mounted on a tape cartridge.

As shown in FIG. 3, FIG. 4 and FIG.
A tape accommodating portion 41, which is formed in a circular shape except for a portion serving as a feeding opening of 0, and a tape feeding portion 42 which is continuous with the tape accommodating portion 41 are provided. The tape accommodating portion 41 includes an upper tape accommodating wall 44 formed to project on the inner surface of the upper case 31a.
a and a lower tape housing wall b formed to project on the inner surface of the lower case 31b, and similarly, the tape feeding portion 42
Is the upper tape feeding wall 4 connected to the upper tape housing wall 44a.
5a and a lower tape feeding wall 45b connected to the lower tape housing wall 44b. Both upper and lower tape feeding wall 4
5a and 45b form a feeding port for the printing tape 100 between the ends of the upper and lower tape accommodating walls 44a and 44b, and are curved in an eddy curve toward the tape delivery port 35 and in the vicinity of the opening 34. Has been extended to.

The upper tape accommodating wall 44a has a substantially circular peripheral wall portion (sub guide wall portion) 46 and a plurality of protruding portions 47 formed on the inner surface of the peripheral wall portion 46 at equal intervals. The strip portion 47 is adapted to be in sliding contact with the upper lateral non-label portion 112 of the contained printing tape 100. Similarly, the lower tape accommodating wall 44b has a substantially circular peripheral wall portion 46 and a peripheral wall portion 46.
And a rising wall 48 having a plurality of projecting portions 47 formed at equal intervals on the inner surface thereof and having a peripheral wall portion 46 that is back-to-back with the opening wall 36 that constitutes the opening portion 34. , And a protruding wall 49 protruding outside the rising wall 48. In this case as well, the protruding portion 47 slides on the lateral non-label portion 112 on the lower side of the accommodated printing tape 100.

The upper tape feeding wall 45a has a curved portion 51 which is continuous with the peripheral wall portion 46 of the upper tape housing wall 44a, and the curved portion 5.
1 and a guide wall portion (main guide wall portion) 52 formed inside 1, and the tip of the guide wall portion 52 extends ahead of the curved portion 51. The guide wall portion 52 is arranged on an extension of the plurality of protruding portions 47, and is slidably in contact with the lateral non-label portion 112 on the upper side of the printing tape 100, like the protruding portions 47. The lower tape storage wall 45b is the lower tape storage wall 4
It has a partition wall portion (support wall portion) 53 which is continuous with the peripheral wall portion 46 of 4b and is formed at the same height as the rising wall 48, and a guide wall portion 52 which is formed inside the partition wall portion 53. Also in this case, the guide wall portion 52 has its tip extending ahead of the partition wall portion 53, and is in sliding contact with the lateral non-label portion 112 on the lower side of the printing tape 100.

Further, the partition wall portion 53 divides the printing tape 100 side and the ink ribbon 200 side from each other so that when the ink ribbon 200 sags, the ink ribbon 200 does not come into contact with the printing tape 100. It divides the space. As a result, it is possible to prevent the ink ribbon 200 from sticking to the adhesive material protruding from the edge of the adhesive label 110 and causing jamming.

On the other hand, a cylindrical protrusion 55 and a cross-shaped rib 56 are formed on the upper case 31a located at the center of the inside of the upper tape accommodating wall 44a. Similarly, a cylindrical protrusion 56 and a cross-shaped rib 56 are formed on the lower case 31b located at the inner center portion of the lower tape housing wall 44b. The upper and lower cylindrical protrusions 55, 55 are portions on the outer peripheral surface of which the tape core 120 of the printing tape 100 is rotatably supported, and the inner peripheral surface of which mounts the tape cartridge 3 on the cartridge mounting portion 9. At times, it becomes a portion that fits into the guide protrusion 17.

When the printing tape 100 is set in the tape accommodating portion 41 constructed as described above, as shown in FIGS. 3 and 6, the horizontal non-label portion 11 on the upper side of the printing tape 100.
2, the plurality of protrusions 47 of the upper tape accommodation wall 44a and the guide wall 52 of the upper tape feeding wall 45a face each other, and the plurality of protrusions of the lower tape accommodation wall 44b are provided on the lower lateral non-label portion 112. The portion 47 and the guide wall portion 52 of the lower tape feeding wall 45b face each other. Therefore, when the printing tape 100 is fed out, both lateral non-label portions 112, 112 of the printing tape 100 are guided by the guide wall portions 52, 52 and are fed while slidingly contacting them. In addition, when the printing tape 100 comes apart, a plurality of protrusions 47
Also functions as a guide member, and the printing tape 100 is sent out while being in sliding contact with both lateral non-label portions 112, 112.

Therefore, the adhesive label 110 of the printing tape 100 that is being fed out is not contacted with any of these guide members at all, and is used for printing even if the adhesive material is easily peeled off due to protrusion or the like. The adhesive label 110 does not come off before. In addition, the tip of each of the protrusions 47 is inclined so that the insertion of the printing tape 100 into the tape accommodating portion 41 can be guided.

On the other hand, the rising wall (peripheral wall portion 46) 48 and the protruding wall 49 of the lower tape accommodating wall 44b, and both guide wall portions (partition wall portion 53) of the upper and lower tape feeding walls 45a and 45b.
In the wedge-shaped space 60 formed by 52 and 52, a stop roller 61 that blocks the reverse running of the printing tape 100 is accommodated in a loose fit state. That is, the rising wall (peripheral wall portion 4
6) 48 and protruding wall 49 and both guide wall portions (partition wall portion 5
3) 52, 52, the rising wall 48 and both guide wall portions 5
2 and 52 form a wedge-shaped wall portion forming an acute angle, and the wedge-shaped wall portion and the stop roller 61 form a reverse running prevention mechanism of the printing tape 100.

The stop roller 61 is made of cylindrical rubber or the like, and as shown in FIG. 7, is formed to have substantially the same size as the size between the upper case 31a and the lower case 31b.
The stop roller 61 is flexible and slightly bent in the free state. Therefore, the stop roller 61 accommodated in the wedge-shaped space 60 is always in contact with the printing tape 100 at any part in the longitudinal direction thereof. Therefore, when the printing tape 100 runs in the forward and reverse directions, it receives the sliding resistance and moves in the wedge-shaped space 60.

That is, as the printing tape 100 is fed out, the stop roller 61 contacts the printing tape 100 and moves to the protruding wall 49 side while rolling to allow the printing tape 100 to run. On the other hand, when the printing tape 100 runs in the opposite direction to the feeding direction, the stop roller 61
Moves toward the narrowed portion between the rising wall 48 and both guide wall portions 52, 52 while rolling in contact with the printing tape 100. Due to this movement, the stop roller 61 is
The printing tape 100 is sandwiched between the rising wall 48 and both guide wall portions 52, 52, and while receiving a reaction force from the rising wall 48, the printing tape 100 is strongly sandwiched between the rising wall 48 and both guide wall portions 52, 52 for printing. Prevent the tape 100 from running backwards.

As described above, since the reverse running of the printing tape 100 can be prevented, the printing tape 1 may be damaged by some impact.
Even if the feeding end of 00 is about to be drawn into the cartridge case 31, this drawing can be prevented. Further, at this time, the portion pressed and sandwiched between the guide wall portions 52, 52 by the stop roller 61 is the printing tape 1
00, the adhesive label 110 is not peeled off even in the reverse running prevention operation.

The tape delivery port 35, as shown in FIG.
Over the upper case 31a and the lower case 31b are formed in a slit shape as a whole, and the narrow portions 63, 63 located at the upper and lower ends, and the wide portion 64 located between the narrow portions 63, 63 are formed. It is composed of. Both narrow parts 63, 63 are
Both lateral non-label parts 11 of the printing tape 100 passing here
2, 112, and the wide portion 64 corresponds to the position of the adhesive label 110. When the printing tape 100 passes through the tape delivery port 35, both lateral non-label parts 11
2, 112 slidably contact the narrow portions 63, 63 so as to be guided to the narrow portions 63, 63, while the adhesive label 110 passes through the edge of the tape delivery port 35 without any contact. Therefore, the adhesive label 110 does not peel off even at the tape delivery port 35.

On the other hand, as shown in FIG. 3, the ink ribbon 200 is fed from a feeding core (feeding spool) 210, and the printing tape 100 is provided in the vicinity of the above-mentioned reverse run preventing mechanism.
And crosses the opening 34 as it is, and further the opening wall 3
It runs along 6 and is wound up by the winding core 220. In this case, the feed-out core 210 on the driven side is braked by the braking mechanism described later so that the ink ribbon 200 does not sag. Further, the winding core 220 on the drive side
In order to prevent the slack of the ink ribbon 200 when the tape cartridge 3 is not attached to the printing apparatus main body 2, its free rotation is blocked by a reverse rotation blocking mechanism described later.

As shown in FIGS. 3, 4, 5, and 9, the pay-out core 210 has a cylindrical upper shaft-like protrusion 71 formed on the inner surface of the upper case 31a and an inner surface of the lower case 31b. It is rotatably supported by a cylindrical lower shaft-shaped projection 72 formed coaxially with the upper shaft-shaped projection 71. The upper shaft-shaped projection 71 is formed short, and the lower shaft-shaped projection 72 is formed.
Is formed long so that the lower half of the feeding core 210 is engaged (see FIG. 9). In the lower shaft-shaped protrusion 72,
A part thereof is removed in an inverted “U” shape to form a sliding contact piece portion 73 having a spring property. A braking spring 75 that biases the sliding contact piece 73 from the inside is inserted into the hollow portion 74 of the lower shaft-shaped projection 72. That is, the sliding contact piece 7
A braking mechanism that presses the inner peripheral surface of the feeding core 210 in the radial direction by 3 and the braking spring 75 to brake the rotation of the feeding core 210 is configured.

The braking spring 75 is a wire (for example, a piano wire).
Is formed by bending, and is composed of a spring main body 75a bent in a substantially "U" shape, and a ring portion 75b in which one end of the spring main body is bent in a circular shape. Braking spring 75
Is inserted into the hollow portion 74 from below, and the ring portion 7
5b contacts the sliding contact piece 73 and presses it,
The other end is in contact with the inner surface of the upper end of the lower shaft-shaped projection 72. It should be noted that the hollow portion 74 of the lower shaft-shaped projection 72 is formed by the braking spring 7.
In order that 5 may be inserted in an appropriate posture, the cross section thereof is formed into a rectangle having the inner surface of the sliding contact piece portion 73 as a short side (see FIG. 3).

The sliding contact piece 73 is a main body 73 having a spring property.
a and the urging end portion 7 in contact with the inner peripheral surface of the feeding core 210
3b, and a sliding contact surface 73c having a shape complementary to the inner peripheral surface of the feeding core 210 is formed on the outer surface of the biasing end portion 73b. That is, the sliding contact piece portion 73 is in sliding contact with the inner peripheral surface of the payout core 210 over a relatively wide area, and can provide a stable braking force to the payout core 210. In addition, the first locking protrusion 73 is formed on the inner surface of the biasing end portion 73b.
While the d is formed, a second locking projection 72a is formed on the inner surface of the upper end portion of the lower shaft-shaped projection 72 corresponding to the first locking projection 73d. When the braking spring 75 is inserted into the hollow portion 74, the ring portion 75b rides over the first locking projection 73d, and then the other end contacts the second locking projection 72a, so that the braking spring 75 moves downward. It is properly set on the axial protrusion 72. Further, with respect to the set braking spring 75, the first locking projection 73d acts as a downward pullout prevention, and the second locking projection 72a acts as an upward pullout prevention.

In this structure, the urging end 73b of the sliding contact piece 73 presses the inner peripheral surface of the feeding core 210 by the braking spring 75, and when the feeding core 210 rotates, the urging end 73b slides. The contact surface 73c is in sliding contact with the inner peripheral surface of the feeding core 210. Therefore, even if the inner peripheral surface of the pay-out core 210 has irregularities, it can be absorbed and a stable spring force can be imparted. Therefore, the braking force (sliding friction) is also stable, and it is possible to apply the back tension with little fluctuation to the ink ribbon 200.

The winding core 220 has a circular upper shaft hole 81 formed in the upper case 31a and a circular lower shaft hole (not shown) formed in the lower case 31b and arranged coaxially with the upper shaft hole 81. And, it is rotatably supported. Winding core 2
A plurality of protrusions 221 are formed in the circumferential direction on the inner peripheral surface of 20, and when the tape cartridge 3 is attached to the printing apparatus main body 2, the winding reel drive shaft 16 meshes with the protrusions 221. The winding core 220 can be driven to rotate (see FIG. 10). At the lower end of the winding core 220, a ratchet-shaped lock receiving portion (not shown) is formed. The lock claw member 91 mounted on the lower case 31b is engaged with and disengaged from the lock receiving portion. That is, by the lock receiving portion and the lock claw member 91,
A reverse rotation preventing mechanism that prevents reverse rotation of the winding core 220 is configured.

The lock claw member 91 includes a member main body 93 rotatably mounted on a pin-shaped projection 92 provided upright on the lower case 31b, a claw portion 94 extending from the member main body 93 toward the winding core 220, and a member. The spring piece portion 95 and the release piece portion 96 extending from the main body 93 in a “V” shape are integrally formed. When the tape cartridge 3 is not attached to the printing apparatus main body 2, as shown in FIG. 3, the claw portion 94 moves toward the winding core 220 side around the pin-shaped projection 92 due to the biasing action of the spring piece portion 95. It is urged to rotate, and the tip of the claw portion 94 is locked to the lock receiving portion of the winding core 220. This allows
Forward rotation of the winding core 220 is allowed (because of the ratchet wheel shape).
However, reversal is prevented.

On the other hand, when the tape cartridge 3 is mounted on the printing apparatus main body 2, as shown in FIG. 10, the cam projection 9 formed on the cartridge mounting portion 9 of the printing apparatus main body 2
The release piece 96 is engaged with a, and the claw 94 is rotated in the opposite direction against the spring piece 95 to disengage it from the lock receiving portion of the winding core 220. As a result, the winding core 220
The locked state by the lock claw member 91 is released. At this time, the take-up core 220 and the take-up reel drive shaft 16
Mesh with each other, and the winding core 220 can rotate without resistance with respect to the lock claw member 91.

[0049]

As described above, according to the braking device and the ribbon cartridge in the ribbon cartridge of the present invention, the sliding contact surface of the sliding contact piece is formed in a shape complementary to the inner peripheral surface of the feeding spool. The spring force is not concentrated on a part of the inner peripheral surface of the pay-out spool, and the spring force can be uniformly and stably applied thereto. Therefore, the back tension applied to the ink ribbon can be stabilized with a simple structure.

[Brief description of drawings]

FIG. 1 is a perspective view of a tape printer according to an embodiment of the present invention with a tape cartridge removed.

FIG. 2 is an external perspective view of a tape cartridge.

FIG. 3 is a plan view of the tape cartridge with an upper case removed.

FIG. 4 is an exploded perspective view of a lower case of the tape cartridge.

FIG. 5 is an exploded perspective view of an upper case of the tape cartridge.

FIG. 6 is a vertical cross-sectional view around the printing tape of the tape cartridge.

FIG. 7 is a vertical cross-sectional view around the reverse feeding prevention mechanism of the tape cartridge.

FIG. 8 is a front view of the tape cartridge around the tape delivery port.

FIG. 9 is a vertical cross-sectional view around a feeding core of a tape cartridge.

FIG. 10 is a plan view of the tape cartridge mounted in the tape printer.

[Explanation of symbols]

1 tape printer 2 Printer main body 3 tape cartridges 9 Cartridge mounting part 31 cartridge case 72 Lower axial protrusion 73 Sliding contact part 73b Energized end 73c Sliding surface 73d First locking protrusion 74 Hollow part 75 braking spring 75a Spring body 75b Ring part 200 ink ribbon 210 Feeding core

Claims (7)

[Claims] 1. A ribbon cartridge, comprising: a delivery spool for delivering an ink ribbon, a hollow shaft-like projection for rotatably holding the delivery spool, and a braking mechanism for braking rotation of the delivery spool in a cartridge case. In the braking device, the braking mechanism may axially "U" a part of the axial protrusion.
Inserted into the hollow portion of the shaft-like projection and the sliding contact piece portion formed by removing it in a letter shape, and urging the tip of the sliding contact piece portion toward the inner peripheral surface of the delivery spool. A braking device in a ribbon cartridge, wherein a tip end portion of the sliding contact piece portion has a sliding contact surface having a shape complementary to the inner peripheral surface of the feeding spool. 2. The braking of the ribbon cartridge according to claim 1, wherein the sliding contact piece portion extends from an inner surface of one of the front and back sides of the cartridge to a substantially middle portion in the axial direction of the delivery spool. apparatus. 3. The braking device for a ribbon cartridge according to claim 1, wherein the shaft-shaped projection is formed integrally with the cartridge case. 4. The locking projection for locking the spring inserted therein in the hollow portion of the shaft-shaped projection, the locking projection being formed in the hollow portion. A braking device in the described ribbon cartridge. 5. The spring is composed of a wire, and includes a spring body bent into a substantially “U” shape, and a ring portion serving as a biasing end obtained by bending one end of the spring body into a circle. The braking device for a ribbon cartridge according to any one of claims 1 to 4, wherein: 6. The cross-sectional shape of the hollow portion of the axial protrusion is
The braking device for a ribbon cartridge according to claim 5, wherein the braking device is formed in a rectangular shape in accordance with the insertion posture of the spring. 7. A ribbon cartridge comprising the braking device of the ribbon cartridge according to claim 1.