JPH0450126Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention moves a carriage on which a type wheel having a plurality of type elements is mounted along a platen, and each time the carriage moves, A type element is selected and struck, and the type element and the printing ribbon work together to print on the printing paper on the platen, and a correction ribbon is placed on the carriage for correcting erroneously printed characters. This relates to a typewriter equipped with a typewriter.

(Problems to be Solved by Prior Art and Inventions) Conventionally, in this type of typewriter, for example, a drive motor for operating a printing hammer and a correction ribbon placed on a carriage is also mounted on the carriage. In some typewriters, a drive motor for feeding the printing paper is also provided in the frame of the typewriter. However, in this conventional configuration, since the motor for driving the printing hammer etc. is mounted above the carriage, the weight of the entire carriage increases and a large load is placed on another motor for driving the carriage. In addition, since drive motors are provided for each of the operating mechanism such as the printing hammer and the paper feeding mechanism, there is a problem in that the number of motors increases, leading to a rise in manufacturing costs.

(Purpose) This invention was made in view of the above circumstances, and its purpose is to provide a typewriter that can be manufactured at low cost by reducing the number of driving sources.

Structure of the Device (Means and Actions for Solving the Problems) In order to achieve the above object, this device includes a paper feeding mechanism that includes the platen and applies feeding force to the paper on the platen, and a paper feeding mechanism that applies a feeding force to the paper on the platen, and a hammer operating mechanism that operates a hammer for striking; a correction ribbon lift mechanism that lifts the correction ribbon from a rest position away from the printing surface of the platen to a use position facing the printing surface; and a correction ribbon lift mechanism that drives each of the mechanisms. A drive source is provided with a cutout recess so that the rotation of the drive gear of the drive source is intermittently transmitted, and the cutout recess faces the drive gear in a non-operating position. a first actuating arm that applies a rotational force to the driven gear so that it rotates in a direction in which it engages with the drive gear; A clutch means for a paper feeding mechanism consisting of a second operating arm that allows rotation of a driven gear or stops rotation, and a clutch means for a paper feeding mechanism that is integrally constructed with a rotating body and rotates in mesh with an intermediate gear attached to an operating shaft. a locking body rotatably disposed between a driven gear and a printing ribbon operating cam that surrounds the rotary body and includes the driven gear and the hammer operating cam integrally; A print hammer actuator and print ribbon feeder disposed inside the body between the rotary body and the print ribbon actuator cam, and transmits the rotation of the intermediate gear to the print ribbon actuator cam in conjunction with the actuation of the locking body. clutch means for the print hammer and print ribbon feed mechanism, which corresponds to a clutch spring; and a clutch means for the drive gear and the lift cam, surrounding the rotating body of the driven gear on the opposite side of the print hammer and clutch means for the print ribbon feed mechanism. a locking body rotatably disposed between the locking body; and a locking body disposed inside the locking body between the rotary body and the lift cam, the rotation of the intermediate gear being directed to the lift cam in relation to the operation of the locking body. clutch means for a correction ribbon lift feeding mechanism comprising a clutch spring for a cassette holder, and selectively operatively connects the drive source and each mechanism based on selective actuation of each clutch means. It is composed of

Accordingly, the paper feed mechanism, the hammer actuating mechanism, and the correction ribbon lift mechanism are selectively operatively connected to the drive source by the respective clutch means during sheet feeding, type element striking, and correction ribbon lifting. In this invention, each of the above-mentioned mechanisms can be driven by a single drive source, so the number of drive sources can be reduced and the device can be manufactured at low cost.

(Embodiment) An embodiment of a typewriter embodying this invention will be described below with reference to the drawings for each mechanism.

[Paper feed mechanism and carriage drive mechanism]

As shown in FIGS. 2 and 11, a pair of front and rear connecting frames 4, 5 having a substantially U-shaped cross section are constructed and fixed between the left and right side walls 2, 3 of the frame 1. As shown in FIG. 2, a keyboard B having a large number of keys K arranged in a row is disposed further forward of the front connecting frame 5. Further, a platen 6 is rotatably supported between both side walls 2 and 3 on the rear connecting frame 4. Then, by rotating the platen 6 while the printing paper is being circulated around the platen 6, a feeding force is applied to the printing paper. A guide shaft 7 is installed on the frame 1 so as to extend parallel to the platen 6, and a carriage 8 formed by bending a metal plate is supported on the guide shaft 7 at the rear thereof so as to be movable along the platen 6. has been done. Further, a guide piece 9 provided at the front of the carriage 8 is movably fitted into the upper part of the front connecting frame 5.

As shown in FIGS. 2 and 11, a motor 10 for moving a carriage consisting of a step motor is attached to the right side of the rear surface of the rear connecting frame 4, and as the motor 10 rotates, A drive pulley 13 that is rotationally driven via a drive gear 11 and a driven gear 12 is provided. A wire 14, shown in FIG. ing. As the drive pulley 13 rotates,
Carriage 8 via driven pulley and wire 14
is moved back and forth along the platen 6.

[Type selection mechanism]

As shown in FIGS. 3 and 4, a type selection motor 16 consisting of a step motor is supported on the front side of a motor bracket 15 supported at the rear of the carriage 8.
A driven gear 17 is rotatably supported on the rear side, and as the type selection motor 16 rotates, the driven gear 17 engages with a driving gear 18 on a motor shaft extending through the motor bracket 15.
is rotated. A type wheel 20 having a large number of radially extending type elements 20a is rotatably supported on a shaft 19 protruding from the center of the rear surface of the driven gear 17, and as shown in FIG. Type characters 21 are formed on the font. Then, based on the print signal, the type wheel 20
is rotationally driven, a predetermined type element 1
The printed characters 9a are selectively arranged at a position facing the printing surface of the platen 6.

The type wheel 20 is housed in a flat box-shaped case 43, and can be attached to and removed from the shaft 19 together with the case 43.

[Printing hammer operating mechanism]

As shown in FIGS. 4, 6, and 7, a printing hammer 24 is rotatably supported at its intermediate portion via a hammer shaft 23 on a hammer bracket 22 fixed to the rear part of the motor bracket 15. A type striking part 25 is formed at the platen side end, and an engaging part 26 is formed at the other end. As shown in FIGS. 6 to 8, a hammer actuating cam 29 is rotatably supported on a clutch bracket 27 supported at the front of the carriage 8 by a support shaft 28. As shown in FIGS. Further, a main operating lever 31 and a sub-operating lever 32 are rotatably supported on the clutch bracket 27 by a support shaft 30 at an intermediate portion and a base end thereof, respectively. One arm of the main operating lever 31 is formed with a linking part 33 that engages with the engaging part 26 of the printing hammer 24 from below, and the other arm is formed with an outer cam surface of the hammer operating cam 29. A cam follower 34 that engages with is provided in a protruding manner. Furthermore, an engagement piece 35 is formed on the main operating lever 31 and is bent from the main operating lever 31 and positioned at a distance from the main operating lever 31 in the axial direction. Further, this main operating lever 31 is supported by a spring 36 suspended between it and the clutch bracket 27.
As a result, the cam follower 34 is urged to rotate in a direction in which it engages with the hammer actuating cam 29.

The auxiliary operating lever 32 has the main operating lever 3.
An engaging portion 37 that can come into contact with the first engaging piece 35 is formed, and a spring 38 suspended between the sub-operating lever 32 and the clutch bracket 27 normally causes the engaging portion 37 to contact the main operating lever. 31 and is in contact with the engagement piece 35 of 31. On the other hand, an electromagnet 39 is attached to the clutch bracket 27, and an armature 41 is rotatably supported by a support shaft 40, and a spring 41b hung between the armature 41 and the clutch bracket 27.
The armature 27 is biased to rotate clockwise in FIG. When the electromagnet 39 is excited, the armature 41 is attracted against the biasing force of the spring 41b and rotated counterclockwise in FIG. The portion 41a engages with the protruding portion 42 of the auxiliary operating lever 32 from below. When the main operating lever 31 rotates clockwise in FIG. 6 due to the biasing force of the spring 36, the auxiliary operating lever 32 also tends to rotate in the same direction due to the biasing force of the spring 38. However, the engagement between the shoulder portion 41a and the protrusion 42 prevents the rotation. Therefore, when the hammer operating cam 29 is rotated clockwise in FIG. 6 in this state, depending on the cam shape,
The main operating lever 31 is activated by the biasing force of the spring 36 alone.
Since the chisel rotates clockwise in the figure, the spring 36
The printing hammer 24 is urged to rotate by the weak urging force of the chisel.

Further, when the electromagnet 39 is demagnetized, the armature 4 is
1 is placed in the position shown in FIG. When the hammer operating cam 29 is rotated clockwise in FIG. 6 in this state, both springs 36 and 38
Both actuating levers 31 and 32 are rotated together by the urging force of , and the printing hammer 24 is strongly urged to rotate by the strong urging force of the springs 36 and 38 .

Then, the hammer 24 is rotated counterclockwise from the inactive position shown in FIG. Then, printing is performed on the printing paper on the platen 6.

[Print ribbon feeding mechanism]

As shown in FIGS. 9, 11, and 12, a support piece 50 protruding from the front of the carriage 8 has a support shaft 51.
A cassette holder 52 is swingably supported, and a ribbon cassette 53 is removably mounted on its upper surface. It should be noted that a part of the printing ribbon R stored in the ribbon cassette 53 in a wound state is exposed from the ribbon cassette 53, and the cassette holder 52 is connected to the lower part of the printing ribbon R shown by a solid line in FIG. 12, as will be described later. When placed at the first position (rest position of the correction ribbon C), the exposed portion thereof is placed opposite the printing surface of the platen 6. A ribbon take-up spool (not shown) inside this ribbon cassette 53
A feed shaft 54 is rotatably supported on the left side of the cassette holder 52 so as to pass through the cassette holder 52, and a ratchet wheel 55 is rotatably supported at the lower end thereof. ing. Further, a support piece 56 is fixed on the cassette holder 52, and its bifurcated portions 56a are fitted to the stepped portions of the feed shaft 54, thereby preventing the feed shaft 54 from coming off and preventing its reversal. The prevention portion 56b is brought into elastic contact with the ratchet wheel 55 located below the cassette holder 52, so that the ratchet wheel 55 can only rotate counterclockwise in FIG.

A rotating member 57 made of synthetic resin is rotatably supported at the base end of the feed shaft 54 between the ratchet wheel 55 and the lower surface of the cassette holder 52, and a pin 58 is protruded from the tip of the rotating member 57. has been done. A ratchet 59 extending toward the base end is integrally formed at the distal end of the rotating member 57, and its free end is engaged with the ratchet wheel 55. A link lever 60 is rotatably supported at its base end on the lower surface of the cassette holder 52, and an elongated hole 61 into which the pin 58 is loosely fitted is formed at its tip. This link lever 60 is urged to rotate counterclockwise in FIG. 9 by a spring 62.

As shown in FIGS. 6 to 9, a printing ribbon operating cam 63 is integrally formed adjacent to the hammer operating cam 29, and a ribbon operating lever 64 is rotatably supported on the support shaft 30. Its upper end can be engaged with and disengaged from the linking lever 60. Further, a spring (not shown) hooked between the ribbon actuating lever 64 and the clutch bracket 27 biases the ribbon actuating lever 64 to rotate in a direction in which one side thereof engages with the printing ribbon actuating cam 63. has been done.

Therefore, when the cassette holder 52 is in the first position, the printing ribbon actuating cam 63
When the is rotated clockwise in FIG. 6, the ribbon actuating lever 64 is swung around the shaft 30 in accordance with the shape of the cam, and as a result of this swiveling, the ribbon actuating lever 64 engages with the linking lever 60. Following the ribbon operating lever 64, the linking lever 60 is reciprocated between a rest position shown by a solid line in FIG. 9 and an operating position shown by a chain line in FIG. Based on this reciprocating swing of the linking lever 60, the rotary member 57 is reciprocated through engagement between the elongated hole 61 and the pin 58, and the ratchet wheel 5
5 is rotated by one tooth in the counterclockwise direction in Fig. 9,
The printed printing ribbon R is wound onto a ribbon take-up spool (not shown).

[Correction ribbon lift mechanism and feeding mechanism]

As shown in FIGS. 9 and 12, a ribbon supply spool 67 on which a correction ribbon C is wound is rotatably supported by a support shaft 66 on a hanging piece 65 bent on the left side of the cassette holder 52. , as shown in FIGS. 9 and 11, the cassette holder 52
A supporting shaft 69 is attached to a hanging piece 68 bent on the right side of the
The take-up spool 70 is rotatably supported by. Then, the correction ribbon C exposed between both spools 67 and 70 is stretched,
A part of the ribbon is hung on guide pieces 71 attached to both rear sides of the cassette holder 52, and is opposed to the platen 6 below the printing ribbon R. As shown in FIGS. 9 and 11, between the support shaft 68 and the hanging piece 68 of the take-up spool 70,
A ratchet wheel 72 is rotatably supported at 9, and is configured such that the ratchet wheel 72 can rotate only in the counterclockwise direction in FIG. 11 due to the elastic contact of a non-illustrated anti-reverse pawl. An operating member 73 made of synthetic resin is rotatably supported at the intermediate portion of the support shaft 69, and the ratchet wheel 72 extends rearward at its front end.
A ratchet 74 is integrally formed to engage the teeth of.

Further, the carriage 8 is integrally formed with a support piece 8a projecting upward, and a linking lever 75 is provided on the support piece 8a with a support pin 7 protruding from an intermediate portion thereof.
It is rotatably supported at 5a. One end of the link lever 75 is rotatably connected to a connecting portion 76 formed on the cassette holder 52, and the other end is rotatably connected to the rear end of the operating member 73. On the other hand, as shown in FIGS. 7, 8, and 12, a lift cam 77 having an endless cam groove 77a is supported on the support shaft 28 so as to be rotatable in the clockwise direction in FIG. Further, as shown in FIG. 12, a driven piece 78 is screwed onto the front left side surface of the cassette holder 52, and the driven piece 78 has the cam groove 77a.
A driven pin 78a that engages with is provided in a protruding manner. .
Therefore, when the lift cam 77 is rotated, the cassette holder 52 is moved to the first position (correction ribbon C) shown by the solid line in FIG. (rest position) and a second position (use position) shown by a chain line in the figure. When the cassette holder 52 is placed at the first position, the printing ribbon R is placed facing the printing surface of the platen 6, and when the cassette holder 52 is placed at the second position, the correction ribbon C is placed facing the printing surface of the platen 6.
is arranged opposite to the printing surface.

Further, as the cassette holder 52 swings back and forth, the actuating member 73 is rotated back and forth via the linkage lever 75 shown in FIG. Rotated clockwise. Then, by rotating the take-up spool 70 integrally with the ratchet wheel 72, the correction ribbon C is moved onto the platen 6.
The correction ribbon C is fed one character pitch from left to right along the line, and the used correction ribbon C is wound up.

In addition, the printing ribbon R, the type wheel 20,
A printing section is constituted by the printing hammer 24 and the like.

Next, each of the above-mentioned mechanisms, namely, a paper feeding mechanism including a platen 6, etc., a printing hammer operating mechanism including a printing hammer 24, etc., a printing ribbon feeding mechanism including a printing ribbon R, etc., and a correction ribbon including a correction ribbon C, etc. The structure of a drive source for supplying driving force to each lift/feed mechanism and a transmission mechanism (clutch means) for selectively transmitting the driving force of the drive source to each of the mechanisms will be explained in sequence.

[Clutch means for feeding mechanism]

As shown in FIGS. 3 and 5, one drive motor 81 consisting of a DC motor is supported on a support plate 80 attached to the rear part of the left side wall 2 of the frame 1, and the motor shaft passes through the support plate 80. A drive gear 82 located outwardly is mounted. The support plate 80
A driven gear 84 is attached to the outer surface of the
is rotatably supported, and the driven gear 84 has a tooth portion 84a that meshes with the drive gear 82 and a cutout recess 84b that disengages the two gears 82 and 86a, forming a type of sector gear. . Further, a locking rib 85 having a substantially fan-like shape and having an engaging portion 85a is integrally formed on the inner surface of the driven gear 84, and furthermore, a locking protrusion 86a is formed inwardly of the locking rib 85. A cylindrical part 8 provided with
6 is integrally formed in a protruding manner.

A first operating arm 87 is mounted on the support plate 80 and is connected to the support shaft 8.
8 is rotatably supported at its lower end, and a protrusion 89 that engages with the engagement portion 85a of the locking rib 85 is provided at its tip. A spring 90 is hung between the first operating arm 87 and the spring hooked portion of the support plate 80, and the spring force causes the protrusion 89 to engage with the engaging portion 85a of the locking rib 85. The driven gear 84 is biased to rotate in the counterclockwise direction in FIG. A second operating arm 91 is rotatably supported on the support shaft 88 at an intermediate portion thereof;
As the upper end portion rotates, the upper end portion can engage and disengage from the locking protrusion 86a and the outer circumferential surface of the cylindrical portion 86. A spring 92 is hung between the second actuating arm 91 and the spring hanging portion of the support plate 80.
As a result, the second actuating arm 91 is urged to rotate in the direction in which it engages with the cylindrical portion 86 .

Further, an electromagnet 93 is mounted on the support plate 80 opposite to the lower end of the second actuating arm 91, and when demagnetized, the second actuating arm is biased by the urging force of the spring 92 as shown in FIG. The upper end of 91 is engaged with the outer circumferential surface of the cylindrical portion 86, and the locking protrusion 86a
is placed in a position where it can be engaged with. On the other hand, as shown in FIG. 3, the cutout recess 84b of the driven gear 84
When the electromagnet 93 is energized with the electromagnet 93 facing the drive gear 82, the lower end of the second actuating arm 91 is attracted by the electromagnet 93, and the second actuating arm 91 moves in the opposite direction as shown in FIG. rotated clockwise,
Its upper end portion is spaced apart from the locking protrusion 86a.

In this case, the biasing force of the spring 90 causes the driven gear 8 to engage the first operating arm 87 and the locking rib 85.
4 is slightly rotated counterclockwise in FIG. 3, and its teeth 84a mesh with the drive gear 82. Therefore, the rotational motion of the drive gear 82 is in a state where it can be transmitted to the driven gear 84. In this state, the drive motor 81
When the drive gear 82 is rotated clockwise in FIG. 3, the driven gear 84 follows the drive gear 82 and rotates one turn counterclockwise in the figure, so that the notch recess 84b is again relative to the drive gear 82. When this occurs, the transmission of rotation is stopped.

Furthermore, after the locking protrusion 86a rotates integrally with the driven gear 84 after the electromagnet 93 is excited, after the locking protrusion 86a is separated from the upper end of the second actuating arm 91, the electromagnet 93 is demagnetized, the second actuating arm 91 is rotated back into the rotation locus of the locking protrusion 86a, and as the driven gear 84 rotates, the second actuating arm 91 is again opposed to the locking protrusion 86a. That is, at the same time when the cutout recess 84b faces the drive gear 82, it is again engaged with the locking protrusion 86a and the rotation of the driven gear 84 is stopped. Note that while the driven gear 84 is rotating, the first actuating arm 87 is swung based on the engagement with the outer peripheral surface of the locking rib 85, and when it faces the engaging portion 85a of the locking rib 85, The engaging portion 85 again
engaged with a.

As shown in FIGS. 3 and 5, a ratchet wheel 101 is fixed on a rotation shaft 100 on the left side of the platen 6, and a rotation lever 1 extends back and forth.
02 is rotatably supported at its front end portion. A long hole 103 extending back and forth is formed in the rear part of the rotary lever 102, and an engagement pin 104 protruding from the driven gear 84 is inserted into the long hole 103.
is engaged. Further, the rotating lever 102
A ratchet 105 is rotatably supported at its base end on the top, and a spring (not shown) allows the distal end teeth of the ratchet 105 to engage with the ratchet wheel 1.
01 is biased to rotate in the direction of engagement with the teeth.

When the driven gear 84 rotates once, the rotary lever 102 is rotated back and forth through the engagement between the engagement pin 104 and the elongated hole 103. The wheel 101 is rotated integrally with the platen 6 by a predetermined angle, and a feeding force is applied to the printing paper on the platen 6.

Note that the notch recess 84b, the first and second operating arms 8
7, 91, etc. constitute a clutch means for the feeding mechanism.

Note that the notch recess 84b, the first and second operating arms 8
7, 91, etc. constitute a clutch means for the feeding mechanism.

Next, a configuration for transmitting the driving force of the drive motor 81 to the printing hammer actuating mechanism, printing ribbon feeding mechanism, and correction ribbon lift/feeding mechanism will be explained.

[Drive source and its related configuration]

As shown in FIGS. 3 and 5, a transmission gear 11 is disposed on the support plate 80 and is constantly meshed with the drive gear 82.
1 is rotatably supported by a support shaft 110. Further, on this support shaft 110, the transmission gear 1
A toothed pulley 112 that rotates together with the toothed pulley 11 is supported. On the other hand, as shown in Figures 2, 3, and 5,
Between the left and right side walls 2 and 3 of the frame 1, an operating shaft 113 with an oval cross section that passes through the carriage 8 and extends parallel to the platen 6 is connected to a pair of left and right bearings 114,
It is rotatably supported by 115. A toothed pulley 116 is rotatably supported at the left end of the operating shaft 113, and both toothed pulleys 112, 1
An endless toothed belt 117 is hung between the belts 16. As the drive motor 81 rotates, the operating shaft 113 is rotated counterclockwise in FIG. 3 via the drive gear 82, transmission gear 111, toothed pulleys 112, 116, and toothed belt 117. .

As shown in FIGS. 7 and 8, an intermediate gear 11 is attached to the operating shaft 113 inside the carriage 8.
8 is inserted and supported so as to be rotatable integrally with the operating shaft 113 and movable in the axial direction. Further, the clutch bracket 27 is provided with a bearing 119 and a regulating piece 120, and the bearing 119 rotatably supports the intermediate gear 118, and the bearing 119 and the regulating piece 120 allow the intermediate gear 118 to Carriage 8 along
Its position is regulated so that it can move integrally with the

[Clutch means for printing hammer operating mechanism and printing ribbon feeding mechanism]

As shown in FIG. 8, the hammer operating cam 63
Bosses 63a and 77b having the same outer diameter are integrally protruded from the inner surface of the lift cam 77. Between both bosses 63a and 77b, the support shaft 2
A substantially cylindrical rotating body 121 having the same outer diameter as the bosses 63a and 77b is rotatably supported on the 8, and a driven gear 122 that meshes with the intermediate gear 118 is integrally formed on the outer periphery of the central portion thereof. There is.
A cylindrical locking body 123 is rotatably supported on the outer periphery of the printing ribbon operating cam side portion of the rotary body 121 and the boss 63a,
Inside the locking body 123, the rotating body 12
1 and the outer periphery of the boss 63a is a clutch spring 124 for operating the printing hammer and feeding the printing ribbon.
is wound. Further, the end of the clutch spring 124 on the print ribbon operating cam 63 side is fixed to the boss 63a, and the driven gear 12
The second end portion is fixed to the locking body 123.
Furthermore, a locking portion 125 is formed on the outer periphery of the locking body 123, which can engage with the upper end hook portion of the armature 41 shown in FIG. Further, the clutch spring 124 is wound in a direction in which the diameter is reduced based on the clockwise rotation of the locking body 123 in FIG.

As shown in FIG. 6, when the electromagnet 39 is demagnetized and the upper end hook portion of the armature 41 is engaged with the locking portion 125 of the locking body 123, the clock of the locking body 123 is Rotation in the direction is restricted. Therefore, even if the rotating body 121 is rotated clockwise in the figure based on the engagement between the intermediate gear 118 and the driven gear 122 in this state,
Since the clutch spring 124 expands in diameter,
The rotating body 12 by the clutch spring 124
1 and the boss 63a are disconnected. Therefore, the print ribbon operating cam 63 and the hammer operating cam 29 are held in a stopped state.

On the other hand, when the armature 41 is disposed outside the rotation locus of the locking portion 125 of the locking body 123 based on the excitation of the electromagnet 39, the rotation of the locking portion 123 is allowed and the clutch spring 124 is reduced in diameter. However, the clutch spring 124 connects the rotating body 121 and the boss 63a. Therefore, when the rotating body 121 is rotated clockwise in FIG. 6 in this state, the rotational force is transmitted to the printing ribbon operating cam 63 and the hammer operating cam 29, causing them to rotate. Then, as described above, based on the rotation of each cam 63, 29, the print hammer 24 is operated via the cam follower 34 etc., and the print ribbon R is fed via the ribbon actuating lever 64 etc.

[Clutch means for correction ribbon lift/feed mechanism]

A locking body 126 having substantially the same shape as the locking body 123 is rotatably supported on the outer periphery of the rotary body 121 and the boss 77b so as to cover the lift cam side portion of the rotating body 121 and the boss 77b shown in FIG. Stopper 12
6, the rotating body 121 and the boss 77
A clutch spring 127 for lifting the cassette holder is wound around the outer circumference of b. Further, an end of the clutch spring 127 on the lift cam 77 side is fixed to the boss 77b, and an end on the driven gear 122 side is fixed to the locking body 126. Furthermore, locking portions 125 are formed on the outer periphery of the locking body 126 at half circumferential intervals. It should be noted that the clutch spring 127 is wound in a direction in which its diameter is reduced based on the clockwise rotation of the locking body 126 in FIG.

Further, as shown in FIG. 7, an electromagnet 128 for lifting the cassette holder is provided in the clutch bracket 27 in parallel with the electromagnet 39 for operating the hammer, and an armature is attracted and operated by the electromagnet 128. 129 is rotatably supported by a support shaft 40 in parallel with the armature 41. The armature 129 has substantially the same shape as the armature 41 described above, and is biased to rotate toward the locking body 126 by a spring (not shown).

As is clear from Fig. 7, electromagnet 1
28, when the upper end hook of the armature 129 is engaged with the locking part 130 of the locking body 126, the rotation of the locking body 126 in the clockwise direction in FIG. 6 is restricted. Ru. Therefore, even if the rotating body 121 is rotated clockwise in the figure based on the engagement with the intermediate gear 118 in this state, the diameter of the clutch spring 127 expands, so that the rotating body 121 is rotated by the clutch spring 127.
The connection between the boss 77b and the boss 77b is cut off. Therefore,
The lift cam 77 is held in a stopped state.

On the other hand, when the armature 129 is disposed outside the rotation locus of the locking part 130 of the locking body 126 based on the excitation of the electromagnet 128, the locking body 126
is allowed to rotate, and the clutch spring 12
7 is reduced in diameter, and the clutch spring 127 connects the rotating body 121 and the boss 77b. Therefore, when the rotating body 121 is rotated clockwise in FIG. 6 in this state, the rotational force is transmitted to the lift cam 77, and the cam 77 is rotated. Then, as described above, based on the rotation of the cam 77, the cassette holder 52 is lifted via the driven pin 78a shown in FIG. 12 and the like.

Next, the electric block circuit in this embodiment will be explained with reference to FIG. In the same figure,
140 is a central processing unit (hereinafter referred to as CPU), and the CPU 140 includes a read-only memory (hereinafter referred to as ROM) 141 that stores a program for controlling the operation of the entire typewriter.
and random access memory (hereinafter referred to as RAM) 142 are connected. Said CPU140
A chopping means 143 is connected to.
When a paper feed signal is input to the CPU 140 by a predetermined key operation, the CPU 140 supplies the chopped electric power to the drive motor 81 via the chopping means 143 and motor driver 144, as shown in FIG. At the same time, the operation of the paper feeding electromagnet 93 is controlled.
Note that this chopping operation is performed to avoid high-speed rotation of the motor 81 when the load is light, such as during a paper feed operation, since the drive motor 81 is composed of a DC motor. .

Also, when a print signal is input by operating various character keys K, the CPU 140
45 to drive and control the type selection motor 16, and as shown in FIG. Continuous supply. At the same time, the electromagnet 39 for operating the printing hammer, hammer, etc. for operating the printing hammer and feeding the printing ribbon is controlled. Also,
When inputting the print signal, carriage return signal, etc., the CPU 140 controls the motor driver 1.
The motor 10 for carriage movement is driven and controlled via the motor 46.

Furthermore, when a correction signal is input by operating the correction key and the same character key K as the erroneously printed character, the CPU 140 outputs the signal to the drive motor 81 via the motor driver 144 without operating the chopping means 143. Each lift electromagnet 12 is used to continuously supply power for a predetermined period of time and to lift the cassette holder.
8.

Next, the operation of the typewriter configured as described above will be explained.

When the character key K is operated with the carriage 8 placed within the left and right printable areas and the printing hammer 24 placed at the rest position shown in FIG. 6, the chopping means 143 shown in FIG. Power is continuously supplied to the drive motor 81 without being activated. When the electromagnet 39 shown in FIG. 6 is continuously excited for a predetermined period of time in accordance with a preset printing pressure, for example, in order to perform printing with a low printing pressure, the armature 41 shown in FIG. While being suction-rotated counterclockwise, it is held in the suction state, and the engagement between the shoulder portion 41a of the armature 41 and the protruding portion 42 causes the sub-operating lever 32 to move to the sixth position.
It is held in the position shown in the figure. As a result, the biasing force of the spring 38 is nullified during printing, which will be described later.

In addition, with the suction rotation of the armature 41,
The armature 41 is the locking part 12 of the locking body 123.
5, the clutch spring 124
As a result, the rotating body 121 shown in FIG. 8 and the boss 63a of the print ribbon actuating cam 63 are connected. Therefore, the driving force of the drive motor 81 shown in FIGS. 3 and 5 is transmitted to the operating shaft 113 via the driving gear 82, the transmission gear 111, the toothed pulleys 112, 116, and the toothed belt 117. 113 and the intermediate gear 118 is rotated counterclockwise in FIG.

The rotation of the intermediate gear 118 is transmitted to the print ribbon operating cam 63 and the hammer operating cam 29 via the driven gear 122, clutch spring 124, etc., and both cams 63, 29 are integrally moved in the clockwise direction in FIG. rotated to

While the printing ribbon operating cam 63 rotates once, the ribbon operating lever 64, the linking lever 60, and the ratchet 59 shown in FIGS. The ratchet wheel 55 is rotated by one tooth in the counterclockwise direction in FIG. 9, and the printed printing ribbon R is fed into the ribbon cassette 53, and the unused printing ribbon R is fed out.

Further, based on the rotation of the type selection motor 16, the type element 20a corresponding to the character key K is selectively arranged so as to face the printing surface of the platen 6.
During one rotation of the hammer operating cam 29, the main operating lever 31 is rotated from a position where the cam follower 34 engages with the maximum diameter portion of the cam 29 to a position where it engages with the minimum diameter portion of the cam 29. As the printing hammer 24 rotates, the letters 21 on the letter element 20a are struck from the back surface thereof, and the letters are printed on the printing paper.

After this printing operation is completed, while the main operating lever 31 is rotated counterclockwise in FIG. 6 against the biasing force of the spring 36 according to the shape of the cam 29, the engaging piece 35 is It comes into contact with the engaging portion 37 of the auxiliary actuation lever 32, whereby both the actuation levers 31 and 32 are rotated together in the same direction, and the protruding portion 42 of the auxiliary actuation lever 32 is separated from the shoulder portion 41a of the armature 41. .

Thereafter, the electromagnet 39 is demagnetized, and the upper hook portion of the armature 41 is connected to the locking portion 1 of the locking body 123.
It is rotated back to within the rotation locus of 25. Therefore, as the locking body 123 continues to rotate, when the locking portion 125 engages the armature 41, the clutch spring 124 releases the connection between the cams 63, 29 and the rotating body 122. At this point, one printing cycle ends.

On the other hand, when correcting an erroneously printed character, move the carriage 8 back to the erroneously printed position and press the correction key followed by the character key K that is the same as the erroneously printed character. Similarly to the case of , the chopping means 1 shown in FIG.
A continuous voltage is supplied to the drive motor 81 without the motor 43 being operated. Then, the electromagnet 128 as well as the electromagnet 39 shown in FIG. 7 are momentarily excited. By momentary excitation of the latter electromagnet 128,
After the armature 129 is rotated by suction and the armature 129 is separated from one of the locking portions 130 of the locking body 126, and until it engages with the other locking portion 130, the clutch spring 127
The rotor 121 and the boss 7 of the lift cam 77 shown in the figure
7b are connected. Therefore, the driving force of the drive motor 81 shown in FIGS. 3 and 5 is transmitted to the operating shaft 113 via the toothed belt 117, etc.
13 and the intermediate gear 118 is rotated counterclockwise in FIG.

Further, the rotation of this intermediate gear 118 is caused by the rotation of the driven gear 1.
22 and the clutch spring 127, etc., to the lift cam 77, and the cam 77 is rotated half a turn clockwise in FIG. This cam 77
During the half rotation, the cassette holder 52 is lifted via the follower pin 78 from the lower first position shown in FIG. 12 to the upper second position. As the cassette holder 52 is lifted, the actuating member 73 is rotated forward via the linkage lever 75 shown in FIG. 11, and its ratchet 74 is rotated by one tooth in the counterclockwise direction in FIG.

Further, based on the excitation of the electromagnet 39, the rotation of the operating shaft 113 is transmitted to each cam 29, 63, and the printing operation by the printing hammer 24 is performed while the cassette holder 52 is located at the second position, The erroneously printed characters are erased by the correction ribbon C.

Thereafter, the electromagnet 128 is momentarily energized again, so that the aforementioned clutch spring 127 connects the driven gear 122 and the lift cam 77, and the lift cam 77 is further rotated by half a rotation. Accordingly, the cassette holder 52 is swung downward from the second position to the first position. Further, the actuating member 73 is rotated back and the ratchet 74 is rotated by one tooth in the clockwise direction in FIG. 11, so that the used correction ribbon C is wound up and the unused correction ribbon C is is rolled out.

At this time, as the cassette holder 52 is lifted, the link lever 60 is moved to the ribbon operating lever 64.
Since the printing ribbon R is separated upward from the swinging range of the printing ribbon R, the printing ribbon R is not fed. Further, in this embodiment, there is no need to provide a motor for operating a printing hammer or a motor for lifting a correction ribbon on the carriage 8, so that it can be manufactured at low cost and the carriage can be made smaller. Furthermore, the weight of the entire carriage can be reduced, and the load applied to the motor 10 for moving the carriage can be reduced, so that the carriage 8 can be moved smoothly.

On the other hand, when applying a feeding force to the paper, for example, when a carriage return key (not shown) is operated after printing one line, the chopping means 143 shown in FIG. 81 and its motor 8
1 is rotated intermittently over a predetermined period of time. At the same time, the electromagnet 93 is momentarily excited, the second operating arm 91 is rotated by attraction, and its upper end is separated from the locking protrusion 86a of the cylindrical portion 86.
Therefore, the protrusion 89 of the first actuating arm 87 and the locking rib 8
5, the biasing force of the spring 90 causes the driven gear 84 to rotate slightly counterclockwise in FIG. It meshes with the gear 82.

Thereafter, the rotation of the drive gear 82 is transmitted to the driven gear 84, and while the driven gear 84 rotates once, the rotation lever 102 is rotated back and forth through the engagement between the engagement pin 104 and the elongated hole 103. Then, the ratchet wheel 101 is rotated by a predetermined angle by the ratchet 105. The platen 6 rotated together with the ratchet wheel 101 applies a feeding force to the printing paper.

Then, when the driven gear 84 rotates once and the notch recess 84b faces the drive gear 82 again,
Transmission of driving force is cut off. Also, at this time, the upper end of the second operating arm 91, which had been returned to the original position shown in FIG. 3 based on the biasing force of the spring 92 due to the demagnetization of the electromagnet 93, engages with the locking protrusion 86a. At the same time, the protrusion 89 of the first operating arm 87 engages with the engagement portion 85a of the locking rib 85, and the driven gear 8
4 is stopped at the position shown in FIG.

Effects of the invention As detailed above, this invention connects and disconnects the paper feeding mechanism, hammer actuating mechanism, and correction ribbon lift mechanism, one drive source, and the drive source and each mechanism. a plurality of clutch means for obtaining the
Since the driving source and each mechanism are configured to be selectively connected in operation, an excellent effect is achieved in that the number of driving sources can be reduced and manufacturing can be done at low cost.

[Brief explanation of the drawing]

Figure 1 is an electrical block diagram of a typewriter embodying this idea, Figure 2 is a plan view of the typewriter, Figure 3 is a partially enlarged left side view, Figure 4 is an enlarged rear view of the carriage, and Figure 5. 6 is an enlarged side sectional view of the hammer operating mechanism, FIG. 7 is an enlarged plan view, FIG. 8 is a sectional view of each clutch means, and FIG. 9 is an exploded perspective view of each ribbon feeding mechanism. An enlarged plan view of the mechanism, FIG. 10 is a partial enlarged sectional view of the printing ribbon feeding mechanism, FIG. 11 is an enlarged right sectional view,
FIG. 12 is an enlarged left sectional view showing the correction ribbon lift mechanism, and FIG. 13 is a time chart showing the state of voltage supply to the drive motor. In the figure, 6 is a platen, 8 is a carriage,
20 is a type wheel, 20a is a type element, 24 is a print hammer, 29 is a hammer operating cam, 81 is a drive motor, 84b is a cutout, 124 and 127 are clutch springs, R is a print ribbon, and C is a correction ribbon.

Claims (1)

[Claims for Utility Model Registration] Type wheel 2 having a plurality of type elements 20a
The carriage 8 on which 0 is placed is moved along the platen 6, and each time the carriage 8 moves, the type element 20a is selected and struck. In a typewriter that prints on the printing paper on the platen 6 and is equipped with a correction ribbon C on the carriage 8 for correcting erroneously printed characters, the typewriter includes the platen 6 and prints on the paper on the platen 6. A paper feeding mechanism 6 for applying feeding force, etc., and a hammer 2 for hitting the type element 20a.
4, and a correction ribbon lift mechanism 77, 7 for lifting the correction ribbon C from a rest position away from the printing surface of the platen 6 to a use position facing the printing surface.
8 etc., and one driving source 81 for driving each of the above mechanisms.
A notch recess 84b is provided in a part so that the rotation of the drive gear 82 of the drive source 81 is intermittently transmitted, and the notch recess 84b is connected to the drive gear 8 in the non-operating position.
A driven gear 84 arranged to face 4
and a first actuating arm 87 that applies a rotational force to the driven gear 84 so that it rotates in a direction in which it engages with the drive gear 82; a clutch means for the sheet feeding mechanism, which is configured integrally with the rotating body 121 and includes a second actuating arm 91 that allows the rotation of the actuator 84 or stops the rotation of the actuating shaft 11;
A driven gear 122 rotates in mesh with an intermediate gear 118 attached to the hammer actuating cam 2, and a driven gear 122 and the hammer operating cam 2 surround the rotating body 121.
Printing ribbon actuating cam 63 in which 9 is integrally constructed.
a locking body 123 rotatably disposed between the
It is disposed inside this locking body 123 between the rotating body 121 and the printing ribbon operating cam 63, and transmits the rotation of the intermediate gear 118 to the printing ribbon operating cam 63 in relation to the operation of the locking body 123. , a clutch means for the printing hammer and printing ribbon feeding mechanism consisting of a clutch spring 124 for actuating the printing hammer and feeding the printing ribbon; and on the opposite side of the clutching means for the printing hammer and printing ribbon feeding mechanism, the driven gear 122;
A locking body 126 is rotatably disposed between the driven gear 122 and the lift cam 77 so as to surround the rotary body 121, and a locking body 126 is provided between the rotary body 121 and the lift cam 77 inside the locking body 126. The intermediate gear 1 is disposed in relation to the actuation of the locking body 126.
18 to the lift cam 77, and a clutch means for the correction ribbon lift feeding mechanism consisting of a clutch spring 127 for cassette holder lift, which transmits the rotation of 18 to the lift cam 77. Based on the selective operation of each clutch means, the drive source 81 and each mechanism What is claimed is: 1. A typewriter characterized in that the typewriter is configured to be selectively connected in operation.