JPH0126350B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a ribbon shift mechanism for a printing device.

Purpose of the Invention It is an object of the present invention to have a simple configuration and a small number of parts, to selectively and reliably arrange the printing ribbon and the collection ribbon at positions facing the printing lines on the platen, and to make it possible for the carriage to print An object of the present invention is to provide a ribbon shift mechanism for a printing device in which the printing ribbon is fed in accordance with the amount of movement only when the ribbon is moved based on a signal.

Embodiment Hereinafter, an embodiment in which the present invention is embodied in a typewriter will be described based on the drawings. As shown in FIGS. 1 to 3, the typewriter of this embodiment has a one-time carbon ribbon cartridge 2 in which the use of the ribbon 1 is completed in one turn, and a one-time carbon ribbon cartridge 2 in which the use of the ribbon 3 is completed in one turn; You can select the multi-carbon ribbon cartridge 4, which has a smaller feed pitch and can print more characters than the one-time carbon ribbon cartridge 2, and the fabric ribbon cartridge 6, which can use the ribbon 5 many times. First, the configurations of the ribbon cartridges 2, 4, and 6 will be explained.

In the one-time carbon ribbon cartridge 2 shown in FIG. 1, an unused carbon ribbon 1 is wound around a supply spool 7, and the carbon ribbon 1 runs outside the cartridge 2 to perform printing. After that, the printed side portion is taken up on the take-up spool 8. The take-up spool 8 is fitted at its shaft portion 8a into a guide groove 9 transparently provided in the cartridge case so as to be movable left and right. 10,1
Reference numeral 1 indicates a leaf spring for preventing free rotation of the spools 7 and 8, and reference numeral 12 indicates a tensioner for applying tension to the carbon ribbon 1. Further, the leaf spring 11 urges the take-up spool 8 toward a pin wheel 52, which will be described later, and the rotation of the pin wheel 52 rotates the take-up spool 8, causing the carbon ribbon 1 to travel in the direction of the arrow. Ru.

In the multi-carbon ribbon cartridge 4 shown in FIG. 2, the take-up spool 8 can be moved left and right as in the one-time carbon ribbon cartridge 2. A rotating shaft 13 supported near the take-up spool 8 is integrally provided with a large-diameter spur gear 14 and a pin wheel 15 having a large number of sharp-pointed pins on the outer periphery. 1
1 toward the pin wheel 15. Therefore, due to the rotation of the pin wheel 15, that is, the rotation of the spur gear 14, the carbon ribbon 3
is run in the direction of the arrow. A spur gear 17 that meshes with the spur gear 14 is provided on the connecting shaft 16 near the rotating shaft 13 . Then, the rotation of the spur gear 17 is reduced to one-fifth and transmitted to the pin wheel 15.

The fabric ribbon cartridge 6 shown in FIG. 3 accommodates an endless fabric ribbon 5, and the fabric ribbon 5 is pulled out of the cartridge case by the cooperation of a pair of pull-out rollers 18 and 19. It travels externally from the inner housing part 20 through between the tensioner 12 and the inner surface of the cassette case, and is stored in the housing part 20 again from between the two pull-out rollers 18 and 19.

Next, the structure of the typewriter will be explained based on FIG. 4 and subsequent figures. A platen 31 is supported at a predetermined position on a typewriter frame (not shown).

A guide shaft 32 is installed on the frame so as to be parallel to the platen 31, and a carriage 33 is attached to the guide shaft 32.
is supported so as to be movable along the printing line. Then, the carriage 33 is moved step by step along the printing line based on a print signal generated by operating a character or symbol key (not shown), and the amount of movement is changed as appropriate depending on the selected character or symbol key. The movement is carried out in so-called proportional space.

A support shaft 3 installed on the upper end of the carriage 33
A cartridge holder 35 is swingably supported on the cartridge holder 4, and the one-time carbon ribbon cartridge 2, the multi-carbon ribbon cartridge 4, or the fabric ribbon cartridge 6 can be selectively attached to the cartridge holder 35. is removably attached to the The ribbons 1, 3, 5 of those cartridges 2, 4, 6 are attached to the platen 3.
The ribbon is fed by traveling in a plane parallel to 1. As shown in FIG. 5, ribbon spools 36 and 37 are provided at the left and right positions of the cartridge holder 35, respectively, and a lift-off collection ribbon 38 wound around one spool 36 is attached to the carbon ribbons 1, 3, 3, etc. The ribbon runs under the front surface of the running section of the ribbon and is wound onto the other ribbon spool 37.

An arm stopper 3 is attached to the upper end of the carriage 33.
9 is integrally formed, and as shown in FIG. It comes into contact with the arm stopper 39 and further rotation is prevented.

As shown in FIGS. 7 and 8, a first spur gear 41 is rotatably supported on the carriage 33 by a shaft 40 below the cartridge holder 35. As shown in FIGS. A spring 4 is attached to the shaft 40.
An operating lever 43 biased in one direction by the lever 2 is rotatably supported, and a knob 43a is provided at the tip located outside the cartridge holder 35. A shaft 44 supported by the carriage 33 has a second
A spur gear 45 is supported so as to be rotatable and movable up and down. This second spur gear 45 has two gear parts 45a and 45b formed above and below, and the lower gear part 45b meshes with the first spur gear 41. Further, the second spur gear 45 is urged upward by a spring 46.
Further, the second spur gear 45 is formed with a fitting recess 45c that opens on the upper surface, and when the multi-carbon ribbon cartridge 4 and the fabric ribbon cartridge 6 are installed, the multi-carbon ribbon cartridge 4 is Fitting protrusions 8b and 19b formed at the lower end of the connecting shaft 16 and at the lower end of the shaft portion 19a of one of the pull-out rollers 19 of the fabric ribbon cartridge 6 are fitted into the fitting recess 45c. Therefore, the rotation of the pin wheel 15 for running the multi-carbon ribbon 3 and the rotation of the pull-out rollers 18 and 19 for running the fabric ribbon 5 are transmitted from the second spur gear 45.

A third spur gear 51 is rotatably supported by a shaft 50 on a support lever 49 which is rotatably supported by the cartridge holder 35 by a shaft 47 and biased in one direction by a spring 48 . On the shaft 50 is a third spur gear 51.
A pin wheel 52 is supported, which is rotated integrally with the
A large number of sharp pins are integrally formed on its outer periphery. And always the springs 42, 48
Due to the biasing force, the bending portion 43b of the operation lever 43 is engaged with and held by a part of the support lever 49, and the support lever 49 is placed in a predetermined position so that the third spur gear on the support lever 49 51 meshes with the upper gear portion 45a of the second spur gear 45. At this time, the pinwheel 52 engages with the printed ribbon 1 on the outermost periphery of the take-up spool 8 of the one-time carbon ribbon cartridge 2. Also, the operation lever 43 is in the seventh position.
When rotated to the two-dot chain line position in the figure, the bent portion 43b slides on the side surface of the support lever 49, the support lever 49 is rotated to the two-dot chain line position, and the third spur gear 51 is rotated to the two-dot chain line position. It is separated from the second spur gear 45.

As shown in FIG. 9, a character selection motor 53 consisting of a pulse motor is fixed to the carriage 33, and the motor shaft 53a has a character selection motor 53 for selecting characters located between the platen 31 and the ribbon cassettes 2, 4, and 6. A type wheel 54 as an element is mounted. This type wheel 54 has a large number of arms arranged radially, and a type 54a at the tip of each arm.
The whole structure has a petal shape. The ribbons 1, 3, 5 are run between the type wheel 54 and the platen 31. Character selection motor 5
A printing hammer 55 is fixed to the outer frame 3.
Then, based on the print signal from the operation of the character, symbol key or collection key, the character selection motor 53
rotates the type wheel 54 to perform a type selection operation, and the first or second solenoid 59, 61, which will be described later, is energized to print a printing ribbon such as the one-time carbon ribbon 1 or a collection ribbon 3.
8 faces the printing surface of the platen 31, the solenoid of the printing hammer 55 is energized, the printing hammer 55 is activated, and printing is performed on the printing paper P on the platen 31 using the selected type 54a.

As shown in FIG. 4, a swing plate 56 as a swing member is swingably supported on the support shaft 34. An arm stopper 56a extending in the direction of the platen 31 is formed on the swing plate 56, and the lower surface of the cartridge holder 35 can be received at the tip of the arm stopper 56a. This arm stopper 5
6a and the cartridge holder 35 and the carriage 33 are provided with springs 57 and 58, respectively.
is tensioned, and the spring 58 has a stronger spring force than the spring 57. A first solenoid 59 as a swinging means is fixed to the swing plate 56, and as shown in FIG. 10, when excited, it attracts the magnetic piece 60 fixed to the lower surface of the cartridge holder 35. As a result, the cartridge holder 35 is rotated in the direction of the arrow shown in FIG.

A second solenoid 61 is installed in the carriage 33.
is fixed, and a cam plate 6 is attached to the armature 61a.
2 is fixed. The cam plate 62 is vertically movably supported by a pin 63 fixed to the carriage 33 through an elongated hole 62a formed therethrough, and is always positioned at an upper position by the biasing force of a spring 90. A cam surface 62b is formed on one side edge of the cam plate 62, and the rocking plate 5 is formed on the cam surface 62b.
6 is engaged by the spring force of the spring 58.

When the first and second solenoids 59 and 61 are demagnetized as shown in FIG. It engages with the lower part of 62b. Therefore, the cartridge holder 35 is placed in the rest position where it is restricted by the arm stopper 56a of the swing plate 56 due to the biasing force of the spring 57, and the printing ribbon such as the carbon ribbon 2 is located below the printing surface of the platen 31. When a character or symbol key is operated in this state, the first solenoid 59 is energized based on the print signal as shown in FIG. 10 before the carriage 3 moves forward, and the cartridge holder 35 is The first piece 60 engages with the suction surface of the solenoid 59.
The printing ribbon is suction-rotated against the biasing force of the spring 57 to the state shown in FIG. When a correction key (not shown) is operated, the second solenoid 61 is energized and the armature 61a is attracted downward based on the print signal as shown in FIG.
The cam plate 62 moves downward and the follower 64 moves to the higher side of the cam surface 62b. As a result, the rocking plate 56 is rocked, and the cartridge holder 35 is rocked to the collection position where it is regulated by the arm stopper 39, as shown in FIG. 6, so that the collection ribbon 38 faces the printing point. At this time, since the solenoid 59 swings together with the swing plate 56, it does not engage with the magnetic piece 60 of the cartridge holder 35, and does not inhibit the swinging of the cartridge holder 35 described above.

As shown in FIGS. 9 and 12, a spring drum 66 as a rotating member is rotatably supported on a shaft 65 on the carriage 33, and on the outer periphery of the spring drum 66 is provided a ribbon feeder whose one end is tied to a part of the frame. A string 67 is wound around it. Therefore, the carriage 33
When the ribbon runs along the printing line on the platen 31, the ribbon feed string 67 is wound up or unwound, and a rotational force is induced on the spring drum 66. An annular ratchet wheel 68 is fixed to the upper surface of the spring drum 66. Above the spring drum 66, a drive gear 69 serving as a ribbon feeding drive member is rotatably and vertically movably supported on the shaft 65, and a gear portion 69a on the outer periphery thereof.
As shown in FIG. 8, the first spur gear 41
A ratchet 69b is formed on the lower surface of the ratchet wheel 68 so as to be able to move toward and away from the ratchet wheel 68. The drive gear 69 is always urged upward by a spring 70, and the ratchet 69b is kept spaced apart from the ratchet wheel 68.

As shown in FIGS. 5 and 11, an interlocking lever 73 is rotatably supported by a shaft 72 on a bracket 71 fixed to the carriage 33, and one arm of the interlocking lever 73 is provided with a lever 73 located on the upper surface of the drive gear 69. A connecting spring 75 is interposed between the other arm and the cartridge holder 35. When the cartridge holder 35 is swung from the rest position to the printing position or the collection position, the interlocking lever 73 is rotated via the coupling spring 75, which lowers the roller 74, and the drive gear 6
9 moves downward and its ratchet 69b engages with the ratchet wheel 68. Therefore, in this meshed state, the rotation of the spring drum 66 is transmitted to the drive gear 69. In this way, the interlocking lever 73 and the connection spring 75 constitute a joining mechanism for joining the drive gear 69 as a ribbon feeding drive member to the spring drum 66 as a rotating member.

As shown in FIG. 13, a ratchet wheel 81 is attached to the shaft 80 of the ribbon spool 37 on the winding side. The ratchet wheel 81
Below the cartridge holder 35, a feed pawl 83 is rotatably supported by a shaft 82, and the feed pawl 83 is rotated from the solid line position to the two-dot chain line position as shown in FIG. This engages the ratchet wheel 81, which rotates the ribbon spool 37 by one pitch and feeds the collection ribbon 38 by one character. A connecting rod 85 is provided between one end of the feed pawl 83 and a long hole 84 formed through the cartridge 33, and when the cartridge holder 35 is swung from the rest position to the printing position shown in FIG. The connecting rod 85 only moves up and down within the elongated hole 84, and the feed pawl 83 is held at the solid line position by the urging force of the spring 86.
When the cartridge holder 35 swings to the collection position shown in FIG.
Since the cartridge holder 35 further swings after being engaged with the inner edge of the upper end of the feed claw 83, the feed claw 83 is rotated to the position indicated by the two-dot chain line.

Next, the operation of the ribbon shift mechanism configured as above will be explained. Now, Figure 4 shows the first and second
The solenoids 59 and 61 are demagnetized and the cartridge holder 35 is shown in the rest position. When a character or symbol key is operated in this state, the character selection motor 53 starts rotating based on the print signal, and the character selection of the character wheel 54 is started.

Also, the first solenoid 59 is energized based on the printing signal, and the cartridge holder 35 is sucked and swung, so that the ribbon cartridge 2, 4, or 6 on the cartridge holder 35 is located at the printing position. Ribbon 1, 3 or 5 of ribbon cartridge 2, 4 or 6 faces the printing point of platen 31.

As the cartridge holder 35 swings, the interlocking lever 73 is moved to the 12th position via the connection spring 75.
The drive gear 69 is rotated in the direction of the arrow in the figure, and the drive gear 69 is pushed down so that the ratchet 69b on the lower surface of the drive gear 69 meshes with the ratchet wheel 68 on the upper surface of the spring drum 66. Therefore, the rotation of the spring drum 66 is transmitted to the drive gear 69.

On the other hand, based on the print signal, the carriage 33 is moved in steps according to the selected character. As a result, the ribbon feed string 67 on the spring drum 66 is pulled out by the amount of stepwise movement, and the spring drum 66 and drive gear 69 are rotated by the amount corresponding to the amount of stepwise movement. Therefore, the printing ribbon such as the carbon ribbon 1 is moved through the first and second spur gears 41, 45, etc. by an amount corresponding to the stepwise movement amount.
That is, the ribbon is fed by an amount corresponding to the print width of the print character 54a corresponding to the operated character or symbol key, and a new portion of the ribbon faces the printing point.

When the printed characters 54a corresponding to the operated character and symbol keys face the printing surface of the platen 31, the printing hammer 55 is excited and printing is performed via the printing ribbon 1 etc. at the printing position.

When the stamping is completed, the first solenoid 59 is demagnetized, and the cartridge holder 35 is returned to the rest position by the spring force of the spring 57.
When the cartridge holder 35 returns to the rest position, the interlock lever 73 returns to the position shown in FIG. 12 via the coupling spring 75, and the drive gear 69 is separated from the spring drum 66.

Although the connecting rod 85 shown in FIGS. 13 and 14 is pulled up as the cartridge holder 35 swings to the printing position, the connecting rod only moves within the elongated hole 84 of the cartridge 33. , the feeding operation of the collection ribbon 38 is not performed.

Next, when the collection key is operated, the second solenoid 61 is energized and the type wheel 54 selects a type. Further, the carriage 33 is not moved step by step. This second
Based on the excitation of the solenoid 61, the cam plate 62 is moved downward, and the action of the cam surface 62b causes the swing plate 56 to swing via the follower 64 to the position shown in FIG. For this reason, the cartridge holder 35
is swung to the position where it is regulated by the arm stopper 39 of the carriage 33, and the ribbon spool 36,
Collection ribbon 38 between 37 and platen 31
facing the printed surface. This cartridge holder 3
5 to the collection position, the connecting rod 85 shown in FIGS. 13 and 14 is pulled up,
It is hooked to the upper edge of the elongated hole 84 while being pulled up. Therefore, by the subsequent rocking of the holder 35, the feed pawl 83 is rotated to the position indicated by the two-dot chain line in FIG. The minute ribbon is sent.

Further, as the cartridge holder 35 swings to the collection position, the drive gear 69 is pushed down via the coupling spring 75 and the interlocking lever 73, and the ratchet 69b and the ratchet wheel 68 are pushed down.
The drive gear 69 and the spring drum 66 are connected to each other, but as mentioned above, since the carriage 33 does not move step by step when the collection key is operated, the ribbon feed string 67 is pulled and the spring drum 66 is connected to the drive gear 69. The drum 66 is never rotated. Therefore, the printing ribbon 1 and the like are not fed.

In this way, when the collection ribbon 38 faces the printing position and the same type 54a as the erroneous printing faces the printing point, the printing hammer 55 is excited and the erroneous printing is erased.

Furthermore, when the tab key, space key or return key is operated, the carriage 33
moves in accordance with the key, but in this case, neither the first nor second solenoids 59, 61 are energized. Therefore, since the cartridge holder 35 is not swung, the drive gear 69 is not coupled to the spring drum 66 via the interlocking lever 73 or the like. For this reason, the carriage 33
is moved and the spring drum 66 is rotated via the ribbon feed string 67, the printing ribbon 1 etc. will not be fed.

As described above, in this typewriter, the ribbon is fed only when the carriage 33 moves step by step based on the print signal generated by operating the character and symbol keys in accordance with the amount of step movement. Moreover, in this typewriter, the rotation of the spring drum 66 is used for ribbon feeding in synchronization with the swinging movement of the cartridge holder with the ribbon cartridge attached from the rest position to the printing position, so the ribbon feeding drive is There is no need for a motor or the like for this, and it is possible to avoid complicating the mechanism.

Effects of the Invention As exemplified in the embodiments above, the present invention provides a mechanism for raising and rotating the holder to the collection position.
Since the two swinging members are also used as stoppers for regulating the rest position of the holder, the structure is extremely simple and the number of parts can be reduced.

Moreover, in this invention, the operator only needs to energize the first solenoid when swinging the holder from the rest position to the printing position, and energize the second solenoid when swinging the holder to the collection position. The holder can be oscillated with extremely simple control without putting a burden on the printer, and by selectively energizing both solenoids, the printing ribbon or collection ribbon can be reliably shifted to a position facing the printing line on the platen. Can be done.

In addition, the printing ribbon can be fed only when the carriage is moved based on the printing signal according to the amount of movement, eliminating the need for a pulse motor etc. for feeding the ribbon, simplifying the configuration for feeding the ribbon. It can be configured as follows.

Furthermore, when the holder is in the printing position, a ribbon feed drive member is actuated via the rotary member based on the movement of the carriage along the printing line, thereby feeding the printing ribbon, and in the case of continuous printing. The excellent effect is that the ribbon can be fed while the holder is held in the printing position, the holder does not move up and down, and ribbon slack due to accompanying vibration does not adversely affect ribbon feeding. play.

[Brief explanation of drawings]

1 to 3 are cross-sectional views showing a one-time carbon cartridge, a multi-carbon ribbon cartridge, and a fabric ribbon cartridge, respectively. FIG. 4 is a side cross-sectional view showing a swinging means for swinging the ribbon cartridge to the printing position and its related structure; FIG. 5 is a plan view showing the cartridge and cartridge holder and their related structure; Fig. 6 is a side view showing the state in which the second solenoid is excited, Fig. 7 is a plan view showing the mechanism for transmitting the ribbon feed rotation to the spool of the cartridge, etc., and Fig. 8 shows the transmission mechanism. 9 is a side sectional view showing a ribbon feeding drive unit, its related structure, and a printing mechanism; FIG. 10 is a side view showing a state in which the first solenoid is energized;
FIG. 11 is a side sectional view showing the mounting structure of the interlocking lever, FIG. 12 is a sectional view showing the relationship between the interlocking lever and the drive gear, FIG. 13 is a side sectional view showing the collection ribbon feeding mechanism, and FIG. The figure is a sectional view showing the operation of the feed claw. one-time carbon ribbon 1, one-time carbon ribbon cartridge 2, multi-carbon ribbon 3, multi-carbon ribbon cartridge 4, fabric ribbon 5, fabric ribbon cartridge 6, platen 31, carriage 33, spindle 34, Cartridge holder 35, collection ribbon 38, swing plate 56 as a swing member, arm stopper 56a, first solenoid 59, and second solenoid 61.

Claims (1)

[Scope of Claims] 1. A ribbon supported rotatably around a single axis 34 on a carriage 33 that can move step by step along the printing lines of a platen 31, and that stores printing ribbons 1, 3, and 5 on its upper surface. A holder 35 on which the cartridges 2, 4, 6 and a collection ribbon 38 are placed; a holder 35 which is swingably supported below the holder 35 on the same axis 34 as the holder 35, and is always in contact with the holder 35; A swinging member 56 having a stopper portion 56a for holding the holder 35 in the lower rest position and rotating the holder 35 upward to the collection position; The holder 35 is rotated upward from the rest position to the printing position, and the printing ribbons 1, 3, 5 are placed on the platen 31.
a first solenoid 59 facing the printing line; and a first solenoid 59 which is supported on the carriage 33 and rotates the swinging member 56 at the time of collection, so that the swinging member 56 integrally raises and rotates the holder 35 to the collection position. Move, Collection Ribbon 3
a second solenoid 61 which faces the printing line of the platen 31; a member 66; and a ribbon feeding drive rotatably supported by the carriage 33 so as to be able to come into contact with and separate from the rotating member 66, and to position a new portion of the printing ribbons 1, 3, and 5 at printing points on the platen 31. member 69 and a spring 70 that normally holds the ribbon feed drive member 69 in a position spaced apart from the rotating member 66.
and a joining mechanism 73 that moves the ribbon feeding drive member 69 to a position where it is joined to the rotating member 66 against the biasing force of the spring 70 based on the swinging of the holder 35 to the printing position. A ribbon shift mechanism for a printing device characterized by comprising the following.