JPH04120060U - printing device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the carriage body 6, etc. in a type wheel type printing device from shaking during printing operation, and to eliminate dancing of the printing ribbon on the carriage body 6, thereby improving printing quality. [Structure] The rear part of the support member 9 of the print hammer drive mechanism in the carriage body 6 and the rear part of the bottom frame 7 for supporting the print ribbon holder member 20 located above the support member 9 are connected in the longitudinal direction of the platen 2. It is supported by a guide shaft 4 disposed along the axis so as to be rotatable and slidable left and right. The front part of the support member 9 is brought into contact with the guide rail 5 parallel to the guide shaft 4 so as to be able to slide freely and to be adjustable in its longitudinal movement relative to the platen 2. The front part of the bottom frame 7 is supported by the guide rail 5 through the head guide body 11 so as not to fall off, and the bottom frame 7 and the support member 9 are connected by a biasing spring 15.
Thereby, the bottom frame 7 and the support member 9 can be prevented from wobbling with respect to the guide rail 5, and play can be restricted.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to the structure of a type wheel type printing device, and more specifically to a carriage type printing device. The drive motor installed on the body rotates in the normal direction to wind up the printing ribbon and perform the printing operation. Concerning things made by sea urchins.

0002

[Conventional technology]

Carry the drive mechanism of the print hammer, print wheel, print ribbon and erase ribbon. A printing wheel-type electric lamp is installed on the body of the cartridge and allows printing and erasing of characters. Child typewriters are well known in the art. By the way, the present applicant has previously developed a compact electronic typewriter of this type. In order to provide the product at low cost, in the specification and drawings of Japanese Patent Application No. 3-12949, We developed and proposed a new structure as follows.

0003 In other words, the front side of the platen (hereinafter referred to as platen) installed between the rear parts of the left and right machine frames of the typewriter. At the bottom (the keyboard operation side of the writer is called the front), there are left and right long guides with a circular cross section. The door shaft is also fixed to the machine frame, and a guide rail is installed parallel to this between the parts near the front of the machine frame. to be fixed. The guide shaft is equipped with the above-mentioned printing hammer and printing ribbon winding device. The rear part of the support member in the carriage body equipped with a drive mechanism for lifting can be moved up and down. It can be installed freely and slidably from side to side. The weight of this support member causes the support member to move forward. In order to maintain a downwardly tilted posture, a protrusion is provided on the front part of the support member. The contact member is always slidably in contact with the rear surface and the lower surface of the guide rail through the contact member. Furthermore, the gap between the printing hammer tip and the platen surface can be widened or narrowed. A freely adjustable mechanism is located between the abutting member and the carriage body. Configured.

0004

[Problem that the idea aims to solve]

According to this configuration, when the printing ribbon is wound up or when the printing hammer is activated, Due to the reaction of the mechanism, the support member in the carriage body moves to the front part of the machine frame. The movement of pressing against the guide rail and the movement of moving away from it will be taken alternately. . Therefore, if there is even a slight gap between the carriage body and the guide rail, With this movement, the carriage body moves slightly back and forth around the guide shaft. It turns out. This may cause noise (abnormal noise). You can also use print ribbon and erase ribbon. Raise the holder member for attachment, centering on the front end of the carriage body. If the carriage is installed so that it can swing downward, the holder will move as the carriage moves back and forth. A phenomenon occurs in which the cover member dances up and down, which also causes noise (abnormal noise). However, the printing point position of the printing hammer may not be stable with respect to the printing ribbon that moves up and down. There was a problem.

[0005] This invention solves the above technical problems and enables quiet printing with stable printing quality. The purpose is to provide a device.

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention has a platen that can be moved back and forth from side to side with respect to the platen. The carriage body includes at least a printing hammer drive mechanism driven by a drive motor. , a printing device comprising a printing ribbon winding mechanism and a printing ribbon holder member. , the rear part of the support member of the printing hammer drive mechanism in the carriage body and the corresponding After the bottom frame for supporting the holder member of the printing ribbon located above the support member. can be rotated and slid left and right on a guide shaft arranged along the longitudinal direction of the platen. The front part of the support member is slidable on a guide rail parallel to the guide shaft. The front part of the bottom frame is brought into contact with the platen so that it can be moved back and forth. is supported on the guide rail via the head guide body so that it cannot fall off, and the bottom frame is The arm and the support member are connected by a biasing spring that resiliently biases them in a direction toward each other. It is a result of the following.

[0007]

【Example】

Next, embodiments of the present invention will be described. casing in typewriter A machine frame 1 is provided at both left and right ends inside the machine. Platen 2 is the platen The vicinity of both left and right ends of the engine shaft 3 are rotatably supported by both the left and right machine frames 1, 1. Plastic A driven gear (not shown) fixed to the left end of the balance shaft 3 is attached to a platen (not shown). It is rotationally driven by a turn drive motor and a platen drive mechanism.

[0008] Between the pair of left and right machine frames 1, 1, there is a guide shaft 4 and a substantially horizontal U-shaped guide in side view. A drain rail 5 is arranged in parallel along the longitudinal direction of the platen 2. Described later The carriage body 6 is attached to the guide shaft 4 and the guide rail 5 in the left and right direction (platen 2 It is supported so that it can move in the longitudinal direction). The carriage body 6 includes a bottom frame 7, a pair of left and right main frames 8a, 8b, a substantially T-shaped support member 9 made of synthetic resin or the like in plan view, and an auxiliary frame 10. include. The rear end of the bottom frame 7 and the rear end of the support member 9 (the end near the platen 2) ) are each rotatably supported on a guide shaft 4.

[0009] The left and right pair of main frames 8a and 8b are connected to the first support portion 12 of the support member 9. and the second support part 16 via pins 17 and 18, and the first support part 12 The second support portion 16 maintains the left-right distance between the left and right main frames 8a and 8b. It functions as a spacer. Next, the front end of the support member 9 moves the carriage body 6 back and forth, as described later. Adjust the distance between the tip of the printing hammer 25 and the platen 2, and then Slideably contacts the guide rail 5 via a position adjustment holding mechanism to maintain the position. Support.

0010 That is, the front and rear longitudinal adjustment is provided on the outer side of the upper end of the pair of left and right main frames 8a and 8b. Plates 70, 70 are each provided. Front end of left and right adjustment plate 70 A support shaft 72 inserted through an oblong hole 71 drilled in each main frame is fixed to the main frame. There is. Each main Fasten screws 74 to frames 8a and 8b. On the other hand, an abutment member 75 is attached to the support shaft 72. An L-shaped engagement member whose rear end is rotatably supported and attached to the front end of the abutment member 75 The mating piece 76 is slidably engaged with the rear end and lower surface of the guide rail 5.

[0011] Then, marks 77, which are bored in the main frames 8a and 8b, are attached to the adjustment plate. When the stroke is at the front and back center position of the rectangular notch 78 formed in the Set it to be the reference position of (gap dimension). Loosen screw 74 once and remove the printing After adjusting the stroke from the tip of the hammer 25 to the platen 2, screw the screw 74. Retighten. The main frames 8a, 8b and the carriage body 6 are guide shafts. Since it is rotatable around 4, the length of the stroke can be adjusted. Ru.

0012 In this way, the support member 9, whose rear end side is rotatable around the guide shaft 4, can be moved forward and downward. With the front end side tilted in the direction, the guide is inserted through the abutting member 75 and the engaging piece It is slidably supported by the rail 5. On the other hand, there is a synthetic resin or the like protruding forwardly on the inner surface of the front end wall plate 7a of the bottom frame 7. The recessed portion of the head guide body 11 engages with the front edge of the guide rail 5 irremovably. On the other hand, the locking portion 13 of the first support portion 12 in the support member 9 and the bottom plate of the bottom frame 7 A tension biasing spring 15 for clamping and biasing is installed between the locking hook 14 of 7b.

[0013] Note that the holder member 20 of the carriage main body 6 stores a printing ribbon. The attached ribbon cassette 19 is detachably held. Attach the front end of the holder member 20 to the The upper and lower parts are connected to the left and right tongue pieces 21, 21 at the upper part of the front end of the tom frame 7 through pins 22, respectively. The rear end of the holder member 20 is rotatably connected via a vertical position switching mechanism 23, which will be described later. It is configured to move up and down.

[0014] As a result, the support member 9 and the bottom of the carriage body 6 are connected to each other by the tension spring 15. The frame 7 is pulled closer to each other, but the front end side of the support member 9 is in contact with the frame 7. Downward movement is restricted by the member 75 coming into contact with the rear end of the guide rail 5. On the other hand, there is a synthetic resin plate protruding forward from the inner surface of the front end wall plate 7a of the bottom frame 7. The concave portion of the head guide body 11 contacts the front edge of the guide rail 5 and moves upward. Movement towards the future will be regulated. Therefore, as described below, Support member 9 and bottom frame 7 are used for reciprocating operation and printing ribbon winding operation. Even if the support member 9 and bottom frame 7 move, the support member 9 and the bottom frame There is no rattling. In other words, the carriage body 6 and the printing ribbon on it The holder member 20 does not move back and forth or move up and down due to printing operations, etc. There is no abnormal noise (noise), and the dot position relative to the printing ribbon is stable. That's what I do.

[0015] Next, the print drive mechanism 24 will be explained according to FIGS. 2 to 6. In Figure 2 , the drive of the printing hammer 25 arranged between the pair of left and right main frames 8a and 8b. The movement mechanism includes a pair of left and right rotation links 26, 26 that are approximately doglegged in side view, and a pair of left and right rear rotation links. This is a four-bar linkage mechanism consisting of partial links 27, 27. That is, the printing hammer 25 A pin 2 is attached to the upper end of the rotation links 26, 26 and the rear links 27, 27. 8, 29, and the longitudinal midway portions of the rotation links 26, 26 are connected to the left and right main parts. One side is rotatably supported by pivot shafts 30, 30 attached to the main frame 8a, 8b. , the lower ends of the rear links 27, 27 are attached to the pair of left and right main frames 8a, 8b, respectively. It is rotatably supported by a single pivot shaft 31 passed through it.

[0016] At this time, a pair of left and right main frames 8a and 8b are provided with an oval shape with longitudinal longitudinal slopes. Attachment grooves 86, 86 are bored and formed, and as shown in FIG. The mounting position can be adjusted via a nut 87. With this configuration, as shown in FIG. After assembling to the arms 8a, 8b, adjust the position of the pivot shaft 31 relative to the mounting grooves 86, 86. The mounting angle θ of the printing hammer 25 can be adjusted by moving it back and forth. So Then, approach the print hammer 25 until the tip end comes into contact with the surface of the platen 2. The printing hammer 25 tip surface (flat surface) and the arc-shaped platen 2 surface at the contact point of the printing hammer 25 Adjust so that the normal to the surface is approximately at right angles. As a result, the print density is higher and lower above and below the type. It is possible to keep the print quality substantially constant, making it extremely easy to adjust the print quality to be constant.

[0017] One DC drive motor 32 mounted on the carriage body 6 is located on the right side in FIG. It is arranged on the right outer side of the side main frame 8b. is fixed to the main shaft 33 of the drive motor 32. When the attached drive shaft 34 is passed through the pair of left and right main frames 8a and 8b, Both are auxiliary frames located to the left of the left main frame 8a as seen in Figure 2. Extends to 10. The drive shaft 34 is connected to the right main frame 8b and the auxiliary frame 1. 0 and 3 with oil-impregnated bearings 35 and 36, respectively, in a so-called both-ends supported manner, Rotation of a cam, etc. that applies a load approximately perpendicular to the axis of the drive shaft 34 between the left and right bearings Load parts, for example, a cam 38 in the print drive mechanism 24 described below and a print ribbon winding The cam 43 in the drive mechanism 37 and the upper and lower parts of the holder member 20 for erasing characters. Rotational load components such as a cam 44 for the position switching mechanism 23 are mounted thereon.

[0018] That is, the printing cam 38, which has a tomoe shape when viewed from the side, is attached to the pair of left and right main frames 8a, It is unrotatably fitted onto the drive shaft 34 between 8b and 8b. On the outer peripheral surface of the printing cam 38, the above-mentioned The rotary link 26 is designed such that the cam roller 39 attached to the lower end of the rotary link 26 is always in contact with the rotary link 26. A spring 40 is mounted between the link 26 and the rear link 27. Also, between the left main frame 8a and the auxiliary frame 10, the printing cover is An encoder disk with a large number of slits bored in its outer circumference adjacent to the frame 38. 41 and the cam body 42 are fitted onto the drive shaft 34 in a non-rotatable manner. This cam body 4 2 is formed with a ribbon feeding cam 43 for feeding the printing ribbon in steps. The raising cam 44 for raising the holder member 20 to the character erasing position is It is formed on the other surface of the cam body 42. In the embodiment, the cam body 42 is integrally made of synthetic resin. to form.

[0019] The printing cam 38, encoder disk 41, and cam body 4 relative to the drive shaft 34 In order to eliminate the misalignment (wobble) of each installation phase of the second etc., the length of the drive shaft 34 is The printing cam 38, encoder disk 41, cam body 42, etc. in the hand direction In order to eliminate misalignment of the mounting position, the following structure is used. As shown in FIGS. 7 to 11, the drive shaft 34 has one side of its outer circumference flat in the middle. A flat notch is formed to form a D-shaped cross section.

[0020] The root portion 34a of the drive shaft 34 that fits into the bearing 35 of the right main frame 8b has a circular cross section and a large diameter. A compression spring is provided between the bearing 35 and the drive motor 32. A screw 45 is inserted, and the printing cam 38 and the cam body 42 have a D-shaped cross section of the drive shaft 34. A through hole also having a D-shaped cross section is bored so as to fit non-rotatably into the shaped part. Printing Insert the cam 38 so that the end surface of the bearing 35 comes into contact with the end surface of the bearing 35.

[0021] The encoder disk 41 is brought into contact with the other end surface of the printing cam 38, and the cam body 4 It is held between one side end surface of 2. Multiple positions protruding from the other end surface of the printing cam 38 The rotation phase is determined by fitting the mounting hole of the encoder disk 41 into the determining protrusion 46. (See Figure 11). In addition, the rotational phases of the cam body 42 and the printing cam 38 are matched, and any wobbling is prevented. In order to prevent The anti-rotation protrusion 48 protruding from one side end surface of 2 is fitted (see FIG. 8).

[0022] On the other end (free end) side of the drive shaft 34, there is a pullout between the cam body 42 and the bearing 36. The printing cam 38 is fitted with the retaining ring 49 and pressed by the compression spring 45. This also prevents displacement of the cam body 42 in the longitudinal direction of the drive shaft 34. The torque plate 50 attached to the drive motor 32 is provided with a detent groove 5. 1, and the locking pin 52 protruding from the right main frame 8b is inserted into the notched groove. 51 to set the installation phase of the drive motor 32 and cause the drive motor 32 to recoil. Prevent rotation. In addition, the torque plate 50 and the right main frame 8b A strong spring 53 is mounted on the groove, and a gap exists between the notch groove 51 and the locking pin 52. By doing so, vibration or rattling of the drive motor 32 during forward and reverse driving is prevented. It is the composition.

[0023] The direction in which the spring 53 is mounted is tangential to the rotation of the drive motor 32. , so that no bending force is applied to the drive shaft 34. Incidentally, reference numeral 55 indicates a slit portion of the encoder disk 41 that is sandwiched between the front and back sides. A photointerrupter 56 for detecting the rotational phase is shown in FIG. Wheel drive motor and wheel drive mechanism (not shown) (both mounted on the carriage body) A daisy wheel (printing wheel) that is rotationally driven by On the rear surface of the free end side of a large number of elastic pieces projecting radially from the boss portion of the G-wheel 56. The printed characters are formed to protrude so as to face the surface of the platen 2. Printing cam 3 The rotation link 26 is rotated via the cam rotor 39 by rotation of a predetermined phase angle of 8. Ru. The daisy wheel is pressed by the printing hammer 25 at the tip (upper end) of the rotary link 26. 56 against the platen 2 and print on paper (not shown) via the printing ribbon. It turns out.

[0024] Next, based on FIG. 3, FIG. 7, FIG. 9, FIG. 13, and FIG. The moving mechanism 37 will be briefly explained. A bracket 57 attached to the lower left side of the holder member 20 has a large number of teeth. A ratchet wheel 58 is rotatably supported by a pin 59. to this pin 59 , a claw lever 60 having a pushing claw 60a and a claw lever 61 having a pulling claw 61a. rotatably supported. Interlocking movement rotatably supported on the lower surface of the holder member 20 The arm 62 and the pawl lever 60 are connected by a pin 63. This interlocking movement arm 62 is biased in the counterclockwise rotation direction in FIG. 13 by a tension spring 64. Also Ribonka The take-up spool 65 for the set 19 is fixed to the pin 59 and rotates integrally. move.

[0025] The base end is rotatably supported on a pivot pin 66 attached to the left main frame 8a. The swinging arm 67 has its tip abutted against the back surface of the interlocking swinging arm 62. It is biased by the coiled spring 68 as shown in FIG. Approximately oval-shaped window hole 6 in the middle of the swinging arm 67 A ribbon feeding cam 43 fitted onto the drive shaft 34 is positioned inside the ribbon 9. The rotating end surface of the cam 43 for feeding the engine is constructed so that it always comes into contact with the protrusion 69a in the window hole 69. to be accomplished.

[0026] Therefore, when the drive motor 32 rotates in the printing direction P (normal rotation), the ribbon is fed. Depending on the shape of the cam 43, the tip of the swinging arm 67 is connected to the back surface of the interlocking swing arm 62. (See the counterclockwise rotation direction in Figures 13 and 14). The ratchet wheel 58 is moved one pitch through the interlocking movement arm 62 and pawl lever 60. The print ribbon is fed in steps by a predetermined distance. This printing ribbon The feeding timing is determined by the printing drive mechanism 24 when the printing hammer 25 is moved to the platen 2. The ribbon feeding cam 43 and the printing cam 3 Set the rotation phase difference with 8.

[0027] Next, in order to make the erasing ribbon face the rear end side of the printing hammer 25, a holder member is used. Regarding the vertical position switching mechanism 23 that raises 20 to the character erasing position, FIGS. 1 to 5, This will be briefly explained based on FIGS. 10 and 12. As shown in FIG. 12, the rising cam 44 formed on the left side of the cam body 42 is a reference cam surface 44 having an equal radius from its rotation center (the central axis of the drive shaft 34). a, and a first inclined cam surface extending continuously in the radial expanding direction from the reference cam surface 44a. 44b, and an outer peripheral cam surface 44d that is connected to the middle part of the first inclined cam surface 44b. A second inclined cam surface 44c that is connected to An end surface 44e formed over 44d, and a second inclined cam surface 44b extending from the first inclined cam surface 44b. An eave-like cam 4 that protrudes in an eave-like manner at its radially outer portion across the inclined cam surface 44c. 4f, and a thin wall portion adjacent to the second inclined cam surface 44c on the radially inner side of the eave-like cam 44f. A guide surface 44h whose flesh pressure gradually decreases toward 44g is formed.

[0028] The driven pin 79 that comes into contact with the rising cam 44 from the left side is attached to the left side of the holder member 20. It is supported movably in the left and right direction by a bracket 80 protruding from the side, and is supported by a coiled spring 81. It is elastically biased so that it always protrudes to the right. Reference position for printing start (home) In the position shown in FIGS. 5 and 10, the tip of the driven pin 79 is The circumferential surface contacts the reference cam surface 44a from the outside of the radius, and the tip of the driven pin 79 contacts the end surface. e, and the boulder member 20 is lowered to the solid line state in FIG. Ru. During printing operation, the cam body 42 rotates in the printing direction P, and the driven pin 79 has an equal radius. It simply moves along the reference cam surface 44a. Then move the cam body 42 in the printing direction. For printing located on the back side of the rising cam 44 while rotating approximately 270 degrees to P. The cam 38 pushes up the cam roller 39, and the rotation of the rotation link 26 releases the printing hammer. 25 moves toward the platen 2 to perform a printing operation.

[0029] At the time of character erasing operation, the cam body 42 (elevating cam 44) first moves in the opposite printing direction HP ( (indicated by the dotted line arrow in FIG. 10), the driven pin 79 rotates approximately 52 degrees to a from the home position along the first inclined cam surface 44b, and then the ascending cam surface 44b. When the pin 44 is rotated in the printing direction P (indicated by the solid arrow in FIG. 10), the driven pin 79 further rises along the second inclined cam surface 44c and reaches the outer peripheral cam surface 44d. this state, the rear end of the holder member 20 has risen by a predetermined distance compared to when printing is activated. , the erasing ribbon disposed on the rear end side of the holder member 20 hits the printing hammer 25. Comes to a position opposite to the rear end of.

[0030] Then, as in the case of the printing operation, the lifting cam 44 is moved approximately 270 degrees in the printing direction P. During the rotation, the printing cam 38 located on the back side of the rising cam 44 The cam roller 39 is pushed up and the printing hammer 25 is moved to the platen by the rotation of the rotation link 26. The erase ribbon moves toward the platen 2 and presses the paper against the platen 2 via the erasing ribbon. Characters can be erased.

[0031] When the driven pin 79 reaches the outer cam surface 44d near the lower end of the eave-like cam 44f, , the cam body 42 is reversely rotated in the anti-printing direction HP, and the driven pin 79 is aligned with the outer cam surface 44d. is guided from the thin wall portion 44g to the inner diameter side of the eave-like cam 44f via the guide surface 44h. , at the point when it crosses the first inclined cam surface 44b, the driven pin 79 is moved by the weight of the holder member. The holder member 20 is lowered so as to fall onto the reference cam surface 44a. So After that, the cam body 42 is rotated by a predetermined angle in the printing direction P and returned to the home position. It is.

[0032] Next, in order to wind up a predetermined amount of erasing ribbon on the take-up spool when character erasing is activated, The erasing ribbon winding mechanism will be briefly explained based on FIGS. 2, 13, and 15. Ru. An erasing ribbon supply spool 82 is attached to the rear left end of the holder member 20. A take-up spool 83 is rotatably attached to the right end of each portion. This winding A ratchet 84 having a large number of teeth is provided on the spool 83. At the rear of the ratchet 84, there is a feed pawl for rotationally feeding the ratchet 84 one tooth at a time. 85 is erected from the bottom frame 7. And as mentioned above, character erase When the holder member 20 rises during operation, the ratchet 84 is far from the feed pawl 85. As the holder member 20 descends, the feed claw 85 Rotate the ratchet 84 one tooth at a time to step feed the erasing ribbon by a predetermined distance. It will be removed.

[0033] Next, in order to replace the daisy wheel 56, move the carriage body 6 to the release position. The release mechanism for moving the camera to the new position will be briefly explained. Figure 15 and Figure 1 6, it is pivoted to the main frame 8b via a pin 91 so as to be rotatable back and forth. Rotate the rear end of the released release lever 92 to the main frame 8b using the pin 93. It abuts from above the base end of the movably pivoted intermediate interlocking body 94, and this intermediate interlocking body The distal end (front end) of 94 is the proximal end of the abutment member 75 that can rotate around the support shaft 72 from below. Therefore, as shown in FIG. When rotated in the direction of the arrow (counterclockwise) to the release position shown by the two-dot chain line, the intermediate The tip of the interlocking body 94 rotates clockwise, and the tip of the abutting member 75 is pressed by this. Rotate counterclockwise. As a result, the engaging piece 76 of the abutment member 75 is guided. Since it will be separated from the bottom surface of the rail 5, the carriage body will be moved by that distance. 6 can be rotated clockwise around the guide shaft 4 and can be rotated to the release position. It is.

[0034]

[Function and effect of the idea]

As mentioned above, the support member 9 of the printing hammer drive mechanism in the carriage body 6 and a button for supporting the printing ribbon holder member 20 located above the support member. A guide shaft 4 disposed along the longitudinal direction of the platen 2 connects the rear part of the tom frame 7 with the rear part of the tom frame 7. The front part of the support member 9 is parallel to the guide shaft 4. It can slide freely on the guide rail 5 and abut on the platen 2 so that it can be moved back and forth. At the same time, the front part of the bottom frame 7 is inserted into the guide rail via the head guide body 11. The bottom frame 7 and the support member 9 are both are connected by a biasing spring 11 that elastically biases them toward each other, so When the hammer drive mechanism is actuated, the reaction force causes the support member 9 to move against the guide rail. movement of the bottom frame 7 back and forth with respect to the wheel 5, and the bottom frame 7 dancing up and down. It can be eliminated. As a result, the collision noise with the guide rail 5 and the holder member 20 It is possible to eliminate the occurrence of abnormal noise due to the vertical movement of the Moreover, bottom frame 7 This prevents the holder member 20 attached to the holder member 20 from dancing up and down, etc. Since the vertical position of the printing ribbon mounted on the printer member 20 does not change during printing operation, This has the effect of improving print quality.

[Brief explanation of drawings]

FIG. 1 is an internal side view of an electronic typewriter.

FIG. 2 is a view taken along the line II-II in FIG. 1;

FIG. 3 is a view taken along arrow III-III in FIG. 2;

FIG. 4 is a side view taken along the line IV-IV in FIG. 2;

FIG. 5 is a side view taken along the line V-V in FIG. 2;

6 is a cutaway plan view of a main part taken along the line VI-VI in FIG. 4; FIG.

7 is an enlarged sectional view taken along the line VII-VII in FIG. 4; FIG.

8 is a sectional view taken along the line VIII-VIII in FIG. 7. FIG.

9 is a side view taken along the line IX-IX in FIG. 8; FIG.

FIG. 10 is a side view taken along the line XX in FIG. 8;

11 is a partially cutaway side view taken along the line XI-XI in FIG. 7; FIG.

FIG. 12 is a perspective view of a lifting cam.

13 is a plan view of the printing ribbon winding mechanism when viewed in the same direction as the II-II arrow in FIG. 1. FIG.

14 is a partially cutaway side view taken along arrows XIV-XIV in FIG. 13; FIG.

15 is a view taken along the line XV-XV in FIG. 2. FIG.

FIG. 16 is a side view taken along arrows XVI-XVI in FIG. 15;

[Explanation of symbols]

2 Platen 3 Platen axis 4 Guide shaft 5 Guide rail 6 Carriage body 7 Bottom frame 8a, 8b main frame 9 Support member 10 Auxiliary frame 11 Head guide body 13 Locking part 14 Locking hook 15 Biasing spring 19 Ribbon cassette 20 Holder member 23 Vertical position switching mechanism 24 Print drive mechanism 25 Printing hammer 26 Rotating link 27 Rear link 32 Drive motor 33 Main shaft 34 Drive shaft 35, 36 Bearing 37 Printing ribbon winding drive mechanism 38 Printing cam 39 Cam trochanter 41 Encoder disk 42 Cam body 43 Ribbon feed cam 44 Climbing cam 56 Dizzy Wheel 58 Ratchet wheel 60 Claw lever 64 Retraction spring 65 Take-up spool 72 Spindle 70 Adjustment plate 75 Contact member 76 Engagement piece 79 Followed pin 83 Take-up spool 84 Ratchet 85 Feed claw 86 Mounting groove 87 Nut 91,93 pin 92 Release lever 94 Intermediate interlocking body

──────────────────────────────────────────────── ─── Continued from front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location B41J 35/03 7318-2C

Claims (1)

[Scope of utility model registration request] 1. A printing device comprising: a carriage body capable of reciprocating left and right relative to a platen; and at least a printing hammer drive mechanism driven by a drive motor, a printing ribbon winding mechanism, and a printing ribbon holder member. In,
The rear part of the support member of the printing hammer drive mechanism in the carriage body and the rear part of the bottom frame for supporting the holder member of the print ribbon located above the support member are connected to a guide shaft disposed along the longitudinal direction of the platen. The front part of the support member is supported so as to be rotatable and slidable left and right, and the front part of the support member is brought into contact with the guide rail parallel to the guide shaft and can be adjusted back and forth against the platen, while the front part of the bottom frame is supported by the head. A printing device characterized in that the bottom frame and the support member are connected to each other by a biasing spring that resiliently biases the bottom frame and the support member in a direction toward each other.