JP2738850B2 - Printer ribbon cassette exchange mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer for transferring ink from an ink ribbon of a ribbon cassette to paper and performing printing, and more particularly, to an arbitrary ribbon from a plurality of ribbon cassettes. The present invention relates to a ribbon cassette exchanging mechanism of a printer capable of selecting a cassette and automatically exchanging and printing.

[Conventional technology]

As a method of using such a printer having a plurality of ribbon cassettes, for example, a ribbon cassette provided with two ribbon cassettes, one of which stores an ink ribbon used once, and the other stores a new ink ribbon. For the ribbon cassette, use the ink ribbon that was used once at the time of calibration, use a new ink ribbon at the time of fair copy, or use the ribbon cassette of two or more different colors to use different printing colors. There are various usages such as

As a conventional ribbon cassette exchanging mechanism of this type of printer, there is one described in, for example, Japanese Patent Application Laid-Open No. 61-164876.

That is, as shown in FIG. 10, a cylindrical platen 71 is mounted on the frame 70, and a carriage shaft 72 is mounted on the frame 70 substantially in parallel with the axial direction of the platen 71. On the carriage shaft 72, a carriage 73 is slidably supported. Also,
The carriage 73 has a thermal head 74 facing the platen 71, a cassette shift lever 75 that rotates around a carriage shaft 72 by a motor (not shown), and a pin 76 attached to the cassette shift lever 75. A cassette holder 77 that can be moved up and down and is pivotally mounted via the head is mounted. The cassette holder 77 has a printing ribbon cassette 7 containing a printing ink ribbon 78a.
8 and a correction ribbon cassette 79 in which a correction ink ribbon 79a is stored are mounted in a state of being vertically stacked in two stages.

Since the ribbon cassette exchanging mechanism of the above-described conventional printer is configured as described above, the motor (not shown)
By rotating the cassette shift lever 75 about the carriage shaft 72 by rotating the cassette holder 77 and moving the cassette holder 77 in the vertical direction to select the ribbon cassettes 78 and 79 facing the thermal head 74, Printing or correction can be performed on the paper P using the ink ribbons of the cassettes 78 and 79.

[Problems to be solved by the invention]

However, in the above-described conventional apparatus, the carriage 73 must be moved along the platen 71 in a state where the plurality of ribbon cassettes 78 and 79 are mounted on the carriage 73, and a large driving force is required for the movement of the carriage 73. In addition, since the ribbon cassette 78 or 79 not used for printing or the like is also moved together with the carriage 73, the paper P may be contaminated by the ink ribbon of the ribbon cassette 78 or 79 not used for printing. Further, since the carriage 73 is mounted in a state in which the plurality of ribbon cassettes 78 and 79 are vertically stacked, there are various problems such as difficulty in replacing the lower ribbon cassette 79. I have.

SUMMARY OF THE INVENTION The present invention solves the above-described problems in the conventional apparatus, can reduce the driving force for moving the carriage, does not cause the paper to be stained by a ribbon cassette not used for printing, and furthermore, the ribbon cassette It is an object of the present invention to provide a ribbon cassette exchanging mechanism of a printer which can easily exchange the ribbon cassette.

[Means for solving the problem]

In order to achieve the above-described object, the present invention elastically sandwiches a ribbon cassette between a carriage that can reciprocate along a platen and a plurality of cassette holding portions formed at positions that can face the carriage. One that can
A cassette holding member provided with a pair of arms, and a cassette support member having a pair of arms capable of elastically holding the ribbon cassette on the carriage is relatively movable with respect to the cassette holding member. So that a pair of arms of each cassette holding portion of the cassette holding body and a pair of arms of the cassette supporting member of the carriage are moved in accordance with the approach operation between the cassette supporting member and the cassette holding body. The pair of arms on the side not holding the ribbon cassette enter the inside of the pair of arms on the side holding the ribbon cassette, and the pair of arms on the side holding the ribbon cassette resist elasticity. [Operation] According to the present invention having the above-described configuration, a cassette mounted on a carriage is provided. By moving the support member forward with respect to the cassette holding portion of the cassette holding body, the pair of arms on the side not holding the ribbon cassette becomes the pair of arms on the side holding the ribbon cassette and the ribbon cassette. And the arms on the side holding the ribbon cassette are expanded so as to resist the elasticity thereof, and the pair of arms on the side not holding the ribbon cassette hold the ribbon cassette. Since the holding is performed, the transfer of the ribbon cassette can be automatically performed by advancing and retreating the cassette support material, and the ribbon cassette mounted on the carriage and used for printing can be automatically exchanged. .

〔Example〕

 Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

1 to 9 show an embodiment of a ribbon cassette exchanging mechanism of a printer according to the present invention. In the drawings, reference numeral 1 denotes a frame which is framed so as to have a substantially L-shaped cross section. A platen 2 having a plate shape extending in the left-right direction is disposed on a horizontal portion 1 a of the frame 1. A cylindrical support rod 3 is supported by the horizontal portion 1a via brackets 4 provided on both right and left ends of the support rod 3 so as to be substantially parallel to the platen 2.

A carriage 5 formed in a plate shape is slidably supported by the support rod 3. At the upper end of the vertical portion 1b of the frame 1, a plate-like guide plate 6 having a substantially L-shaped cross section is attached by screws 7, 7,... It is slidably supported at the end of the plate 6. A rack 9 substantially parallel to the platen 2 is formed at an end of the guide plate 6. The rack 9 has a take-up bobbin which is supported by a support shaft 10 on the carriage 5 and which will be described later. The gear 11 for driving the rotation of the gear 27 is engaged.

A gear 13 (only one is shown in the drawing) is supported on the left and right ends of the frame 1 such that the toothed belt 12 is substantially parallel to the platen 2 on the horizontal portion 1a of the frame 1.
The toothed belt 12
Is driven by a motor 14 connected to one gear 13. The toothed belt 12 is connected to the carriage 5, and the carriage 5 can reciprocate along the support rod 3 by running of the toothed belt 12 by the motor 14.

A thermal head 15 that prints on a sheet facing the platen 2 is attached to the carriage 5 so as to be able to come into contact with and separate from the platen 2. Further, a plate-like cassette support member 16 substantially parallel to the carriage 5 is attached to the carriage 5 by a parallel crank mechanism 17 so as to be movable in parallel so as to come into contact with and separate from the carriage 5 in front of the carriage 5. . The parallel crank mechanism 17
Are provided on the left and right sides of the cassette supporting member 16. A pair of links 17a, 17b crossing each other in an X-shape are pivotally connected to each other by pins 17c, and the ends of the links 17a, 17b are pinned. 17d, 17e, 17f and 17g are pivotally attached to the left and right sides of the carriage 5 and the cassette support 16, respectively. Note that the pins 17e and 17g are elongated holes 18 and 1 formed in the upper ends of the left and right sides of the carriage 5 and the cassette support 16, respectively.
9 slidably locked. A rotary crank mechanism 20 is mounted on the carriage 5, and the rotary crank mechanism 20 performs an operation of moving the cassette support 16 in parallel. As shown in FIG. 7, the rotary crank mechanism 20 includes a rotary plate 20a serving as a rotary member rotatably supported by the carriage 5.
And a connecting link 20c forming a connecting member pivotally connected to the eccentric position of the rotary plate 20a by a pin 20b, and the distal end of the connecting link 20 is pivotally connected to the cassette support 16 by a pin 20d. I have. And, the rotating plate 20a
The motor is driven to rotate by a motor (not shown).

On both left and right sides of the cassette support member 16, plate-like arms 21, 22 each having an engagement portion 21a having a tip portion gently curved inward and a projection (not shown) formed at the upper and lower ends are substantially formed. Support shafts 23, 2 at an interval equal to the width of ribbon cassette 22
3 are slidably supported so as to face each other. Each arm 21 is urged by a coil spring 24 to rotate in a direction approaching each other.
Are held upright toward the front of the cassette support 16 by abutting the left and right sides of the cassette support 16. At the upper end of the cassette supporting member 16, a pair of positioning pins 25, 25 are erected so as to project forward. In addition, cassette support 16
A pair of rotatable take-up bobbins 26, 27 are erected at a central portion thereof so as to protrude forward at a predetermined interval from each other.

The front end of the horizontal portion 1a of the frame 1 has a lateral length approximately twice as long as the cassette support 16 and has a cassette support
A plate-like cassette holder 28 facing in parallel with 16 is erected. A pair of support projections 2 is provided on the bottom of the cassette holder 28 at appropriate intervals in the longitudinal direction of the cassette holder 28.
9,30 are protruding downward. These support projections
The coaxial guide shafts 31 and 32 extending in the horizontal direction protrude from the 29 and 30 so as to face each other. On the other hand, U-shaped cutouts 33 and 34 are formed on both sides of the upper end of the horizontal portion 1a of the frame 1 respectively, and the guide shafts 31 and 34 are formed in these cutouts 33 and 34. 32 are fitted. A coil spring 35, which is urging means for urging the cassette holding plate 28 in the direction of arrow A in FIG. 1, is contracted between the one support projection 30 and the frame 1. The cassette holder 28 is always urged in the direction of arrow A by the coil spring 35, and the positioning part 36 formed on the other support projection 29 is always in contact with the positioning part 37 formed near the notch 33. Thus, the cassette holder 28 is positioned.

As shown in FIG. 2, a plurality of pairs of engagement portions 38a and 39a having substantially the same shape as the arms 21 of the cassette support 16 are formed on the surface of the cassette support 28 facing the cassette support 16 as shown in FIG. Arms 38 and 39 (two pairs in the embodiment) are supported by support shafts 40 and 41 at positions corresponding to the respective arms 21 so as to be rotatable in a substantially horizontal direction. The arms 38 and 39 are urged by coil springs 42 so as to rotate in a direction approaching each other in pairs. Further, a stopper 4 is provided at the base of each arm 38, 39.
The arms 3 and 3 are held upright by the stopper 43 being in contact with the cassette holding body 28. And the cassette holder
The cassette holder 2 is provided between each pair of arms 38 and 39 of 28.
8a and 28b.

On the cassette holding body 28, guide plates 44, 44; 45, 45 are provided upright at intervals substantially equal to the arms 38, 39 forming a pair and located above the arms 38, 39, Protrusions 44a, 45a are formed at the tips of the guide plates 44, 45, respectively, and extend in the direction in which the opposing members approach each other. The arms 38, 39 of the cassette holder 28
A horizontal plate-shaped cassette receiving base 46 is provided upright so as to protrude substantially in the horizontal direction.
The distance from the upper surface of 46 to the lower ends of the projecting pieces 44a, 45a of the guide plates 44, 45 is greater than the height of the ribbon cassette 22. The ribbon cassette 22 of the cassette holder 28
As shown in FIG. 6, a contact plate 47 to be in contact with the ribbon cassette 22 and a contact plate 47 interposed between the contact plate 47 and the cassette holder 28 are provided on the surface on which Is provided with a cushion member 48 such as a coil spring for supporting the spring.

In the ribbon cassette 22 mounted on the carriage 5 and the cassette holder 28, an ink ribbon 50 is wound around a pair of reels (not shown) in a cassette case 49 which is a cassette body having a substantially rectangular parallelepiped shape. Cassette case
It is housed so as to be led out of 49.

As shown in FIG. 4, both right and left side surfaces of the cassette case 49 are formed in a substantially circular curved surface in a cross section. When the ribbon cassette 22 is mounted on the cassette supporting member 16 and the cassette holder 28, the arms 21, 3 are provided on the left and right side surfaces of the cassette case 49, respectively.
Steps 51 and 52 are formed at positions corresponding to the upper end portions of the cassettes 8 and 39 at intervals in the thickness direction of the ribbon cassette 22, and among these, the step 51 close to the cassette holding body 28 has The projections of the engaging portions 21a of the arm 21 can be engaged with the projections of the engaging portions 38a, 39a of the arms 38, 39. Has become. Further, a pair of positioning holes 35, 53 penetrating in the thickness direction are formed at positions corresponding to the positioning pins 25, 25 of the cassette support member 16 at the upper end of the cassette case 49. Further, an opening 54 is formed in the lower surface of the cassette case 49, and an intermediate portion of the ink ribbon 50 is led out from the opening 54. A pair of through holes 55 and 56 are formed at the center of the cassette case 49 in the vertical direction at the same interval as the winding bobbins 26 and 27, and the ribbon cassette 22 is supported by the cassette support member 16. When mounted on the reel, the bobbins 26 and 27 are engaged with the reel (not shown) through the through holes 55 and 56, respectively.

As shown in FIG. 1, the frame 1 descends along a vertical portion 1b from a paper feed port 57 formed at an upper end portion of the vertical portion 1b, and further proceeds forward to a horizontal portion 1a. A paper path 59 is formed between the head 15 and the platen 2 to reach the paper discharge port 58. In this paper passage 59,
A plurality of pairs of feed rollers 60, 60 face each other, and the drive rollers of each pair of feed rollers 60 are connected to a motor (not shown) via a belt 61 and the like, are driven to rotate, and printing is performed by rotation of each pair of feed rollers 60. The paper P to be transported is conveyed.

An opening 62 for mounting the ribbon cassette 22 to the cassette holder 28 is formed in the upper portion of the frame 1, and the cassette holder 28 slightly below the opening 62 is horizontally spaced apart from each other. A pair of elongated holes 63, 63 extending are formed. On the other hand, the opening 62 of the cassette holder 28
Is formed to cover the cover. The lid 64 has a pair of flexible tongues 65, 65 that can be engaged with the slots 63, 63, and is attached to the guide plate 6 by a plurality of screws 66, 66. It is fixed.

Next, the operation of the present embodiment having the above-described configuration will be described.

First, remove each screw 66 to open the opening 62, and
The tongue piece 65 of the lid 64 is released from the engagement with the elongated hole 64, and the lid 64 is removed from the guide plate 6 of the frame 1. Then, the ribbon cassette 22 is mounted on each of the cassette holders 28a and 28b of the cassette holder 28 from the opening 62. At this time, each ribbon cassette 22
Is inserted downward along the guide plates 44 and 45 from the opening 62,
The ribbon cassette 22 is placed on the cassette holder 46. In this state, the ribbon cassettes 22 are engaged with the engagement portions 38a, 39a of the arms 38, 29.
The projections (not shown) are engaged with the step 52 of the ribbon cassette 22, are held by the arms 38 and 39 by the pressing force of each spring 42, and are held by the cassette holding body 28. Also,
When each ribbon cassette 22 is placed on the cassette receiving base 46, the upper end of the ribbon cassette 22 is
Provided below 4,45. After mounting each ribbon cassette 22 on each cassette holding portion 28a, 28b of the cassette holding body 28,
The lid 64 is attached to the guide plate 6 of the frame 1 as before,
The opening 62 is closed.

Next, the cassette holding portions 28a and 28b of the cassette holding body 28
Of the plurality of ribbon cassettes 22 and 22 mounted on the printer are selected. That is, when a selection button (not shown) is pressed, a motor 14 is driven by a control signal from a control unit (not shown) of the printer, and travels on the toothed belt 12 to move the carriage 5 along the support rod 3 so that the selected ribbon is moved. Carriage 5 in front of cassette 22
To stop. Then, as shown in FIG. 7, by driving another motor (not shown), the rotating plate 20a is rotated counterclockwise to move the connecting link 20c forward, and the cassette holding body 28 is moved to the parallel crank. The mechanism 17 moves in parallel so as to approach the cassette holder 28 by the action of the mechanism 17.

When this operation is described in detail, as shown in FIG.
In a state where the cassette support 16 is separated from the cassette holder 28, the tips of the arms 21 and 21 of the cassette support 16 are inside the ends of the arms 38 and 38; 39 and 39 of the cassette holder 28, that is, In this state, when the cassette supporting member 16 is brought close to the cassette holding member 28, the selected ribbon cassette 22 is positioned as shown in FIG. 8 (b). The protrusion of each arm 21 of the cassette support 16 is inserted between each arm 38 or 39 holding the ribbon cassette 22 and the left and right sides of the ribbon cassette 22, respectively.
While the arms 38 or 39 are disengaged from the ribbon cassette 22 so as to expand against the spring force of 42, the protrusions of the engaging portions 21a of the arms 21 are stepped on the left and right sides of the ribbon cassette 22. The ribbon cassette 22 is held by the arms 21 which are engaged with the coil springs 51 and urged by the coil springs 24, respectively. Further, as shown in FIG. 6, since the cushion member 48 is provided, the cassette support 16 is
When abutting on the ribbon cassette 22 in close proximity to 28, the cushion member 48 can absorb shocks and errors of each mechanism. Further, as the cassette support 16 approaches the cassette holder 28, the arm 2 of the cassette support 16
The ribbon cassette 22 sandwiched between 1, 21 is a cassette support material.
Each of the positioning pins 25 protruding from the 16 is inserted into each of the positioning holes 53 of the ribbon cassette 22 to be positioned at a predetermined position. In addition, cassette support material
The 16 winding bobbins 26 and 27 are provided with the through holes 55 and
It is inserted into 56 and engaged with a reel (not shown) around which the ribbon cassette 22 is wound. Here, the take-up reel is operated by the motor to remove slack of the ink ribbon in the cassette so that the ink ribbon does not catch on the head when the ink ribbon is set on the carriage 5.

Thereafter, when the rotating plate 20 shown in FIG. 7 is further rotated counterclockwise, the connecting link 20c is moved rearward (to the right in FIG. 7), and the cassette supporting member 16 is moved by the action of the parallel crank mechanism 17. The selected ribbon cassette 22 is set on the carriage 5 while being held between the arms 21. During this movement, each arm 38 or 39 of the cassette holder 28 comes into sliding contact with the outside of each arm 21 of the cassette support 16. The ink ribbon 50 led out of the ribbon cassette 22 is connected to the thermal head 15 and the platen 2.
, The thermal head 15 is projected in the direction of the platen 2, and the ink ribbon 50 and the paper are sandwiched between the platen 2 and the thermal head 15 so as to be in a printable state.

Next, the operation of replacing the ribbon cassette 22 with another one will be described.

First, the carriage 5 is moved along the support rod 3 and the empty pair of arms 38 and 39 of the cassette holder 28 is moved.
The carriage 5 is located in front of the cassette holding portion 28a or 28b between
Position. Then, the cassette support 16 is translated toward the cassette holder 28 in the same manner as described above.
Then, as shown in FIG. 8 (c), the cassette holder 28
Arm 38, 39 is inserted between the left and right sides of the ribbon cassette 22 and each arm 21 of the cassette support member 16, and each arm 21 is expanded against the coil spring 24 so that the ribbon of each arm 21 is expanded. While releasing the engagement with the cassette 22, each arm 38
Alternatively, the engaging portion 38a or 39a of the 39 and the step portion 52 of the ribbon cassette 22 are engaged, and the ribbon cassette 22 is sandwiched between the arms 38 and 39 urged by the coil springs 42, respectively.
During this movement, each arm 21 of the cassette supporting member 16 comes into sliding contact with the outside of each arm 38 or 39 of the cassette holding member 28. Thereafter, when the cassette support 16 is returned to the direction in which it is set on the carriage 5 in the same manner as described above, the ribbon cassette 22 is moved to the cassette holder 28.

Next, the carriage 5 is moved along the support rod 3 in the same manner as described above, and the carriage 5 is moved in front of another ribbon cassette 22 mounted on the cassette holder 28.
Is stopped and the cassette support 16 is moved in the direction of the cassette holder 28 in the same manner as described above, so that another ribbon cassette 22 can be mounted on the cassette support 16. Then, the cassette supporting member 16 on which the other ribbon cassette 22 is mounted is again moved to the carriage 5 in the same manner as described above.
, The ribbon cassette 22 can be replaced with another one.

As described above, according to the present embodiment, the ribbon cassette 22 can be automatically replaced.
By mounting a plurality of ribbon cassettes 22 composed of ink ribbons 50 of different colors, multicolor printing can be easily performed without bothering humans, and the cassette holding body 28 By mounting the ribbon cassette 22 containing the ink ribbon 50 used once for calibration and the ribbon cassette 22 containing the new ink ribbon 50 for copy-writing, after printing with the ribbon cassette 22 for calibration, By automatically exchanging the ribbon cassette 22 with the one for the fair copy, the fair print can be immediately performed.

Further, the cassette holder 28 is positioned by the coil spring 35 so that the positioning portion 36 of the support protrusion 29 is always in contact with the positioning portion 37 near the cutout portion 33 of the frame 1 and is supported by the frame 1. The transfer of the ribbon cassette 22 between the cassette supporting member 16 and the cassette holder 28 can be reliably performed.

Further, since only one ribbon cassette 22 is mounted on the carriage 5 for printing, the carriage 5 can stably run even if the driving force of the motor 14 running on the carriage 5 is reduced.

Furthermore, since the parallel movement of the cassette supporting member 16 is performed by a combination of the parallel crank mechanism 17 and the rotary crank mechanism 20, the links 17a and 17b of the parallel crank mechanism 17 are provided.
No large load acts on the cassette support member 16, so that the cassette support member 16 can be stably translated for a long period of time.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made as necessary. For example,
The number of ribbon cassettes held by the ribbon holder may be three or more.

〔The invention's effect〕

As described above, according to the present invention, the driving force for moving the carriage can be reduced, and the ribbon cassette not used for printing does not stain the paper, and the ribbon cassette can be easily replaced. To play.

[Brief description of the drawings]

1 to 9 show an embodiment of a ribbon cassette exchanging mechanism according to the present invention. FIG. 1 is a perspective view of a printer to which the present embodiment is applied, and FIG. 2 is a perspective view of a cassette holder. FIG. 3 is a perspective view of the arm, and FIG. 4 is a view of FIG.
FIG. 5 is a front view of the cassette holder, FIG. 6 is a schematic side view of the ribbon cassette changing mechanism, FIG. 7 is a schematic side view of the carriage, and FIGS.
(C) is a plan view showing the operation state of the ribbon cassette exchange mechanism, FIG. 9 is a side view showing the operation state of the ribbon cassette exchange mechanism, and FIG. 10 is a side view showing the conventional ribbon cassette exchange mechanism. 1 ... frame, 2 ... platen, 3 ... support rod,
5. Carriage, 16 Cassette support, 17 Parallel crank mechanism, 20 Rotating crank mechanism, 20a Rotating plate, 20c Linking link, 21, 38, 39 Arm, 22
Ribbon cassette, 25 positioning pin, 28 cassette holder, 31, 32 guide shaft, 36, 37 positioning part, 38a,
39a: engagement portion, 48: cushion member.

Claims (1)

(57) [Claims] A pair of arms capable of elastically holding a ribbon cassette between a carriage reciprocally movable along a platen and a plurality of cassette holding portions formed at positions capable of facing the carriage. And a cassette supporting member having a pair of arms capable of elastically holding the ribbon cassette, the cassette supporting member being mounted on the carriage so as to be able to advance and retreat relative to the cassette holding member. The pair of arms of each cassette holding portion of the cassette holding body and the pair of arms of the cassette supporting member of the carriage are moved together with the ribbon cassette as the cassette supporting member approaches the cassette holding member. The pair of arms not holding the ribbon cassette enter the inside of the pair of arms holding the ribbon cassette, and the side holding the ribbon cassette. Printer ribbon cassette exchange mechanism by a pair of arms as allowed to expanded against the elastic characterized by being configured to sandwich the ribbon cassette.