JPH02117531A - Printer - Google Patents

Abstract

PURPOSE:To make a paper feeding roller on a rotary shaft rotate as making pressure contact to the back face of a printing paper sheet without slip for always feeding printing paper sheets to a printing unit stably, by intervening a limiter for controlling the torque of the rotary shaft between a drive shaft and the rotary shaft. CONSTITUTION:When a drive shaft 11 operates, a paper sheet feeding roller 38 is moved until it makes pressure contact to the back face of a printing paper sheet via a rotary shaft 37 revolving around the drive shaft 11 as the center. When the drive shaft 11 operates more, the upper sheet feeding roller 38 makes pressure contact to the whole back face of the printing paper sheet stable pressure contact force without slip to rotate via a limiter 39, and the printing paper sheet is fed to a printing unit.

Description

[Detailed description of the invention] The invention will be explained in the following order.

A. Industrial field of application B1 Overview of the invention C6 Prior art D. Problem to be solved by the invention E0 Means for solving the problem F3 Effect G. Embodiment G1 Overall configuration of printer G2 Configuration of paper feed section G3 Configuration of paper feed tray and its locking mechanism G4. Structure of paper feeding mechanism and paper feeding system Gs, sliding configuration of paper ejection unit and paper ejection tray G6. Head moving mechanism configuration C7, ribbon cartridge storage section +1 configuration G6. Structure of drive system C9, structure of drive force switching mechanism C+O, effect of embodiment H, effect of invention A, industrial application field This invention wraps print paper (photographic paper) around a platen, The present invention relates to a printer that can always stably feed paper through a thermal transfer type color printer or the like that performs color printing with a thermal head (print head) via an ink ribbon.

It was made by sea urchin.

B9 Summary of the Invention The present invention provides a printer in which a paper feeding section is disposed in the printer main body so as to face the printing section, and the paper feeding section is equipped with a paper feeding mechanism for conveying printed paper to the printing section. The paper feeding mechanism includes a drive shaft that is disposed in the printer main body and rotates by a drive source, a rotation shaft that revolves around the drive shaft due to rotation of the drive shaft, and a drive shaft that is provided on the rotation shaft and that prints the paper. The structure consists of a paper feed roller that transports printer paper one sheet at a time to the printer, and a limiter that is interposed between these drive shafts and a rotating shaft to control the torque of the rotating shaft. The roller can be moved to press against and away from the back side of the print paper (the side opposite to the print surface) in the paper feed tray, and when the paper feed roller is in pressure contact, the print paper can be securely brought into contact with the print section. BACKGROUND OF THE INVENTION For example, a printer is known in which print paper fed from a paper feed tray is wound around a platen and a thermal head prints on the print paper via an ink ribbon. The schematic structure of this printer will be explained in detail with reference to FIGS. 38 and 39. Reference numeral 200 is a printer main body, and a paper ejecting section 202 and a paper discharging section 202 are located in the upper and lower positions facing the printing section 201 in the printer main body 200. Paper feed units 203 are arranged respectively. A paper feed roller 20 serving as a paper feeding mechanism is located between the paper ejection section 202 and the paper feeding section 203 near the paper feeding section 203.
4, and the paper feed section 203 includes a paper feed tray 207 having a bottom plate 206 on which print paper 205 is placed.
It is provided so that it can be attached and detached freely.

When feeding paper, the bottom plate 206 in the paper feed tray 207 is stacked with the back side (the side opposite to the printing surface) on the bottom plate 206 by a moving mechanism (not shown) as shown in FIG. 38. The back side of the uppermost printed paper 205 is rotated upward so as to come into pressure contact with the paper feed roller 204, and when the paper is ejected, the back side of the uppermost printed paper 205 is brought into contact with the paper feed roller 204, as shown in FIG. It is designed to rotate downward and away from the target.

The print paper 205 is conveyed to the platen 208 of the printing unit 201 by the paper feed roller 204 and wrapped around the platen 208 via a pinch roller 209 or the like.
is printed via the ink ribbon 2!1 by the thermal head 2!0 of the printing unit 20+ while the platen 208 rotates three times in the direction of the arrow shown in FIG. As shown in the figure, by rotating the platen 208 in the same direction as above, the sheets are discharged to the paper discharge section 202 via the branch guide 212 and stacked.

D1 Problems to be Solved by the Invention However, in conventional printers, the paper feed roller 204
In addition to the printer body 200 being provided with a drive shaft (none of which is shown) linked to a motor that drives the paper feed roller 20, the bottom plate 206 of the paper feed tray 207 is moved.
4 and the printed paper 205 is pressed against the printed paper 205.
Since it is necessary to separately provide a surface moving mechanism for conveying the print paper 205, the structure becomes complicated and there is a drawback that the print paper 205 cannot be stably fed.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a printer that can stably feed print paper to a printing section with a simple structure.

81 Means for solving the problem The paper feed section is arranged in the printer body so as to face the printing section,
In the printer, the paper feeding unit is equipped with a paper feeding mechanism that transports print paper to the printing unit, and the paper feeding mechanism is connected to a drive shaft that is arranged in the printer body and rotates by a drive source, and the drive shaft. A rotating shaft that revolves around the rotating shaft, a paper feed roller that is provided on this rotating shaft and that transports the printer paper one sheet at a time to the bipedal printing section, and a paper feed roller that is interposed between these drive shafts and the rotating shaft, It consists of a limiter that controls torque.

When the F0 action drive shaft is driven, the paper feed roller moves via a rotating shaft that revolves around the drive shaft until it comes into pressure contact with the back surface of the print paper. Furthermore, when the drive shaft is driven, the paper feed roller rotates by pressing against the entire back surface of the print paper through the limiter with a stable pressure contact force without slipping, and the print paper is reliably fed to the printing section.

G. Example Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

G8. Overall configuration of the printer I in FIG. 17 is a thermal transfer color printer, and the printer main body 2 consists of a rectangular frame-shaped inner chassis 3 and a rectangular box-shaped case-shaped outer chassis 4 that covers the inner chassis 3. It is roughly structured. As shown in Fig. 2, on the right side of the front (front) of the printer main body 2, there are a shelf-shaped paper tray holder (paper feed section) 5 and a paper output tray holder (paper ejection section) 6, and on the left side thereof. They are arranged on the lower side and the upper side, respectively, facing the printing section 7 located therein.

Between the front plate 3a and the rear plate 3b of the inner chassis 3 below the paper feed tray receiver 5 of the printer main body 2, there is a paper feed mechanism lO whose drive shaft conveys the print paper 8 one by one to the printing section 7. 11, and between the front plate 3a and the rear plate 3b of the chassis 3 between the printing part 7 and the paper ejection tray receiver 6, there is a plate printed by the printing part 7. The multiple paper ejection rollers 12 that send out the printed paper 8 to the paper ejection tray receiver 6 side are supported! It is rotatably supported via 3.

Also, the front plate 3a of the inner chassis 3 located approximately in the center of the printing section 7
A platen 14 is rotatably supported via a support shaft 15 between the rear plate 3b and the rear plate 3b. The printing section 7 on the lower side of the platen 14 serves as a ribbon cartridge storage section 16.

Incidentally, as shown in FIG. 17, the paper discharge tray receiver 6 is
It is exposed at the upper right side of the outer chassis 4 of the printer main body 2, and the paper feed tray 5 and the ribbon cartridge storage section 16 are supported by a cover that is openable and closable at the lower right side and left side of the outer yarn 4. 4a and cover 4b
covered with.

G2. Structure of Paper Feeding Section As shown in FIG. 2.5, the paper feeding tray receiver (paper feeding section) 5 is made of synthetic resin and formed into a rectangular plate shape, and is connected to the front plate 3a of the inner chassis 3. It is arranged between the rear plates 3b and is fixed with screws or the like to the upper part of an opening 3c opening at the center right side of the front plate 3a.

A pair of U-shaped hook portions 5a, 5a extending downward and facing each other are integrally molded on both sides of the paper feed tray receiver 5. A paper feed tray 20, which will be described later, is removably housed in the pair of hook portions 5a, 5a.

In addition, as shown in Fig. 5.6, the paper feed tray receiver 5
A rectangular four part 5b recessed downward is formed in the center.

A pair of guide grooves 5c, 5c are formed in the longitudinal direction of this recessed portion 5b (direction perpendicular to the rear plate 3b of the inner insole 3). Then, an ejecting member 18 is inserted between the pair of guide grooves 5 (
It is provided so as to be able to freely slide along the 25c. The ejecting member 18 is made of synthetic resin and is formed into a plate shape with a vertical U-shape and a side C-shape, as shown in FIG. That is,
On both sides of the eject member 18, a pair of upright portions 18a, 1 are inserted into the pair of guide grooves 5c, 5c, respectively.
8a is extrusion molded. In addition, this pair of standing parts 18
The proximal end portions 18b, 18b side of a, 18a are connected to the recessed portion 5b.
It is further molded to protrude outward in an L-shape so that it slides on the top surface of the holder. As a result, the ejecting member 18
The hook part 18c that comes into contact with the tip of the paper feed tray 20 on the tip side that hangs down in a letter shape hangs down on the back surface of the recess 5b, and slides back and forth for a predetermined stroke along the pair of guide grooves 5c, 5c. It's free.

Further, a pair of base end portions 18b of the ejecting portion 118,
L-shaped notches 18d and +8d of 18b and the recess 5
A pair of notches 5d, 5 on the rear plate 3b side of the chassis 3 in b.
A pair of tension coil springs (tensile elastic members) are connected to
19.19 was interposed. As a result, the eject member 18 is always pulled and biased toward the rear plate 3b.

Gs, Structure of Paper Feed Tray and its Lock Mechanism As shown in FIG. 7, the paper feed tray 20 is made of synthetic resin and is formed into a rectangular box shape that is slightly larger than the print paper 8 and has a completely open top. , - collar part 21a of side part 21 and other side part 22
By inserting the collar portion 2+a into the pair of hook portions 5a, 5a of the old paper feed tray receiver 5, it can be freely attached to the paper feed tray receiver 5. From the center of the bottom 23 of the paper feed tray 20 to the negative side 21, about half of the back side (the side opposite to the printing surface) of the print paper 8 set in the paper feed tray 20 is exposed. An opening 24 is formed.

Further, the front portion 25 side of this paper feed tray 20 is a gripping portion. Inside this front part 25 and inside the tip part 26 facing the front part 25, there is a pair of holes for feeding the lowest print paper 8 placed on the bottom part 23 one by one to the printing part 7 side. Each base 27a of the delivery lever 27.27 is supported by a pin. The claw portions 27b, 27b bent and formed on the tip side of the pair of delivery levers 27.27 are connected to the paper feed tray 20.
are located at each corner on the opening 24 side of the
By placing each corner of the print paper 8 on the side of the opening 24, the print paper 8 is transferred one sheet at a time to the printing section 7.
It is now possible to send it to the side.

Furthermore, a locking portion 28 is formed on the front end portion 26 side at the center of the back surface of the bottom portion 23 of the paper feed tray 20 .

The locking portion 28 has a long tapered surface 28a inclined at approximately 45 degrees with respect to the tip portion 26, a ■-shaped surface 2gb, and a short tapered surface 28c, each projecting into a substantially triangular prism shape. The rear plate 3b side of the inner chassis 3 has one paper feed tray 2 which is engaged with and disengaged from the locking portion 28 and is attached to the paper feed tray receiver 5.
A locking device tM30 is provided to maintain or release the installed state.

As shown in FIG. 8, the locking mechanism 30 includes a substantially dogleg-shaped locking plate 32 rotatably supported via a shaft 31 on a notched bent horizontal portion 3d of the rear plate 3b, and Board 3
A lock bin 33 is provided upright on one end 32a of the paper feed tray receiver 5 side of the paper feed tray receiver 5, and a hook portion 3 is provided on the other end of the lock plate 32.
2b is inside the rear plate 3b.
It is composed of a tension coil spring 34 that urges rotation.

As a result, when the front part 25 of the paper feed tray 20 is inserted into the paper feed tray receiver 5 while pushing the front part 25 of the paper feed tray 20, the lock plate 32 resists the tensile force of the tension coil spring 34 as shown in FIGS.
C), the lock pin 33 locks into the paper feed tray 20.
The attachment is locked by being engaged with the 7-shaped surface 28b of the engagement portion 28. Then, when releasing this mounting lock state, the li? of the resistance tray 20 is required. By pressing all 25 parts of J part 25, Fig. 20 (d), (e
), the lock pin 33 is connected to the V of the locking portion 28.
The attachment lock state is released when the attachment is removed from the letter-shaped surface 28b.

G4 Structure of Paper Feeding Mechanism and Paper Feeding System As shown in FIG. 9.10, the paper feeding mechanism 10 that conveys the lowest print paper 8 of the paper feeding tray 20 attached to the printer main body 2 to the printing section 7 is configured as follows. , a drive shaft 11 rotatably mounted between the front plate 3a and rear plate 3b of the inner shear 3, and the rotation of the drive shaft 11 causes a pair of arm members 36.
A rotating shaft 37 that revolves through a rotary shaft 36, a rubber paper feeding roller (paper feeding means) 38 that is fixedly attached to this rotating shaft 37 and conveys the print paper 8 sheet by sheet to the printing section 7, and these drive rollers. A limiter 39 is interposed on both sides of the paper feed roller 38 between the shaft 11 and the rotating shaft 37 and controls the torque of the rotating shaft 11.
It is roughly composed of.

Each of the limiters 39 is a compression compressor interposed between each arm member 86 rotatably supported by the drive shaft 11 and each drive gear 40 fixed to the drive shaft 11 inside each arm member 36. First limiter 41 made of a coil spring
, each arm member 36 that rotatably supports the rotation shaft 37, and the rotation shaft 11 inside each arm member 36.
a driven gear 4 provided in the
2 and a second limiter 43 interposed between them.

Each of the second limiters 43 is connected to a limiter rotating shaft 45 that is fixed to a rotating shaft 37 and rotatably supports the driven gear 42 by sandwiching a felt 44, and a limiter rotating shaft 45 that rotates toward the arm member 36 side of the limiter rotating shaft 45. A freely supported spring presser 46 and the driven gear 4 of this limiter rotating shaft 45
The felt presser 48 is rotatably supported with a felt 47 sandwiched between it and the driven gear 42 on the second side, and a compression coil spring 49 is interposed between the spring presser 46 and the felt presser 48. There is.

The first limiter 41 is designed to control the torque around the drive shaft 11 of the pair of arm members 36 and 36, and also to lift the weight of the paper feed roller 38 and the print paper 8. controlled by the necessary force. Further, the second limiter 43 is designed to control the torque of the paper feed roller 38, and is also controlled to the force necessary to separate and convey the print paper 8. Note that the pair of arm members 36 and 36 are prevented from being removed by respective washers 50. Further, the pair of arm members 36.3
A plate spring 51 is attached to the upper surface of the paper feed tray 20, which corresponds to the lower edge 27c of the pair of delivery levers 27, 27, respectively. Due to the elastic biasing force of the pair of leaf springs 51.51, the claw portions 27b of the pair of delivery levers 27.27.

27b is always pressed against the print paper 8 set on the bottom 23 of the paper feed tray 20.

As shown in FIG. 1, an intermediate paper guide plate 5 made of synthetic resin and serving as a paper feed guide member extends from the paper feed roller 38 in the inner chassis 3 to one peripheral surface of the platen 14.
2 is arranged. Further, an upper paper guide plate 53 made of metal is arranged between the paper feed tray receiver 5 and the platen 14.

A synthetic resin mounting frame 54 constituting an opening is attached above the platen 14 in the inner chassis 3. This mounting frame 54 is removably provided with a paper guide plate 55 made of synthetic resin as a guide member that covers the other peripheral surface of the platen 14 from just above it. The paper guide plate 55 has a plurality of ribs 55a extending vertically in an arc shape toward the platen 14 side. A pinch roller 56, which corresponds to the platen 14, is rotatably supported via a shaft 57 between the pair of ribs 55a, 55a located in the middle.

Further, the upper surface side of the paper guide 55 is covered with a metal plate-shaped lid body 58 that is engaged with and detached from the upper edge of the front plate 3a of the inner palm 3 and the lower edge of the rear plate 3a. There is. That is, one end side of this face piece 58 is connected to the pair of locking holes 3 of the rear plate 3b.
e and 3e, and a U-shaped stopper 59 made of synthetic resin is fixed to the other end. A pair of claws 59a5 formed on the tip side of this stopper 59
The cover 58 can be attached to and detached from the printer main body 2 by engaging and detaching the cover 9a at a predetermined position on the upper edge of the front plate 3a.

As shown in FIG. 17, a rectangular opening 4c is also formed in the outer chassis 4 corresponding to the lid 58. This opening 4c can be opened and closed by a rectangular lid 4d.

G. Configuration of Paper Discharge Unit and Paper Discharge Tray As shown in Figure 1.2, the paper discharge tray holder 6 is made of resin and is formed into a rectangular box shape with openings on the front and top sides. It is attached at a predetermined position on the upper right side between the front plate 3a and the rear plate 3b of No. 3. The bottom of this paper ejection tray holder 6 is two levels high.

It has low bottom parts 6a and 6b, and the high bottom part 6a on the rear plate 3b side is the first paper ejection position, and the low bottom part 6b on the front plate 3a side is the second paper ejection position. ing.

Approximately at the center of the high bottom 6a of the paper discharge tray receiver 6, there is a pair of vertical openings 6d extending from the rear edge of the bottom 6a to the top of a rear part 6c standing vertically.

6d is formed. A pair of paper extrusion parts 60a, 60a protrudingly formed at the tip of a substantially U-shaped paper ejection extrusion claw 60 are provided in and out of the pair of openings 6d, 6d. That is, the base end lower part 60 of the paper ejection pushing claw 60
b is rotatably supported on a pin 9a of a mounting plate 9 attached between the front plate 3a and the rear plate 3b. Further, a pin 61 is embedded in the base of the paper ejection pushing claw 60 and projects horizontally.

As a result, the pair of paper extrusion parts 60a, 60a of the paper ejection extrusion claw 60 rotates around the pin 9a of the mounting plate 9 and closes the pair of openings 6d.

6d to protrude above the high bottom portion 6a. Furthermore, a horizontal guide piece 6e for guiding the ejected print paper 8 is protruded from the rear portion 6c. Further, the pin 61 protruding from the base of the paper ejection push-out claw 60 is linked to an actuation plate 125, which will be described later, via a slide plate 621 and a rotating plate 63, and as the slide plate 62 moves back and forth, The pair of paper extrusion parts 60a, 60a of the paper ejection extrusion claw 60 are adapted to appear and retract into the pair of openings 6d, 6d.

Further, as shown in FIG. 1, a paper discharge tray 64 is removably housed on the low bottom portion 6b of the paper discharge tray receiver 6. As shown in FIG. Further, above the upper paper guide plate 53, a pair of upper and lower paper guide plates 65 and 66 are arranged at the upper edges of the front plate 3a and rear plate 3b of the inner shear 3. Below this lower paper guide plate 66, a pinch roller 67 that is in contact with the platen 14 is mounted on a spindle 6.
It is rotatably supported via 8. The printed paper 8 to be printed and discharged is inserted between these upper and lower paper guide plates 65 and 66, pressed against each of the paper discharge rollers 12, and stacked on the paper discharge tray 64. A light reflection type paper edge sensor 69 is disposed on the lower paper guide plate 66 and the upper paper guide plate 53 near the platen 14 to detect the edge of the print paper 8 and determine the start of printing.

Ga, Structure of Head Moving Mechanism As shown in FIG. 1, below the platen 14 of the printing section 7 is a head moving mechanism 71 that brings the planar thermal head (print head) 70 into contact with and away from the platen I4.
It is arranged.

As shown in FIG. 11, this head moving mechanism 71 has a support shaft 7 that is connected to the front plate 3a and rear plate 3b of the inner chassis 3.
a head support member 73 that is swingably supported by the thermal head 2 and to which the thermal head 70 is fixed;
a sub-head support member 75 which is pivotally supported together with the head support member 73 on the support shaft 72 on both sides thereof, and has a pair of compression coil springs 76 and 76 interposed between the heat sink 74 of the thermal head 70 and the bottom plate portion 75a; A pair of links 77.77, one end of which is pivotally supported by a pin on both sides of the tip of this sub-head support member 75, and a pin 78.78 protruding from the other end of this pair of links 77.77 have recesses 79a, 7 at the tip.
a pair of drive arms 79.79 that engage with 9a to swing the head support member 73 and sub-head support member 75 toward the platen 14;
The front plate 3a of the inner chassis 3 is fixed by penetrating the base of the inner chassis 3.
and a drive shaft 80 rotatably supported by the rear plate 3b.
and a ribbon roller 82 rotatably supported on both sides of the sub-head support member 75 via a pair of L-shaped auxiliary arms 81, 81.

As shown in FIG. 12, the head support member 73 is formed into a U-shaped plate, and has insertion holes 73a, 73a formed at the bases on both sides of the upright side, through which the support shafts 72 are inserted. be. Each of the insertion holes 73a is formed as a long hole extending in the head pressing direction of the platen 14, so that the head support member 73 can freely move toward the platen 14. Thereby, self-alignment of the thermal head 70 can be easily achieved. Further, the head pressure of the thermal head 70 at this time is applied by the pair of compression coil springs 76 and 76 when the head support member 73 is pressed against the platen 14 by each drive arm 79 using the support shaft 72 as a fulcrum. It has become. The head support member 73 swings toward the platen 14 due to the biasing force exerted by the pair of compression coil springs 76, 76.
b is regulated to a predetermined value.

The ribbon roller pressure of the ribbon roller 82 is applied separately from the head pressure by a tension coil spring 83 interposed between each of the auxiliary arms 81 and the sub-head support member 75.

GV, Structure of Ribbon Cartridge Storage Portion As shown in FIG. 1, the ribbon cartridge storage portion 16 has a space in which a ribbon cartridge 85 can be stored. This ribbon cartridge 85 has Y (yellow) 0M inside its main body.
(magenta).

It rotatably supports a supply ribbon reel 87 and a take-up ribbon reel 88, around which an ink ribbon 86 having a continuous colored area consisting of C (cyan) colored portions is wound. Incidentally, the beginning of the Y color of the ink ribbon 86 is detected by a light transmission type sensor 89. This transmission type sensor 89 is composed of a light emitting section 89a and a light receiving section 89b.

The ribbon cartridge storage section 16 includes a ball holding plate 90 that holds the supply ribbon reel side 87 of the ribbon cartridge 85, which is provided between the front plate 3a and the rear plate 3b of the inner chassis 3, and a ball holding plate 90 that holds the supply ribbon reel side 87 of the ribbon cartridge 85, and a ball holding plate 90 that holds the supply ribbon reel side 87 of the ribbon cartridge 85. It is roughly composed of a ball holding plate 9I that holds the take-up ribbon reel 88 side. The front plate 3a is provided with an insertion opening 92 for the ribbon cartridge 85, and the rear plate 3b is provided with a supply driven reel stand 93 and a take-up drive reel stand 94 diagonally upward and downward, respectively. It is installation.

As shown in FIG. 15, the supply driven reel stand 93 and the take-up drive reel stand 94 are mounted on a mounting plate 95 having a rectangular cross section.
Each shaft 96, 9 protrudes inward from the rear plate 3b fixed to
are rotatably supported through mounting plates 9 and 7.
limiter gears 98 and 99 are provided between the rear plate 3b and the rear plate 3b. Further, each of the reel stands 93 and 94 has a rear plate 3.
Reel claws 93a and 94a that engage with the supply ribbon reel 87 and take-up ribbon reel 88 of the ribbon cartridge 85 are provided protruding from the inside of the b side, respectively.

Ga, drive system configuration As shown in FIG.
At each end outside the rear plate 3b of the inner chassis 3,
Paper feed roller drive gear 100 and paper ejection roller drive gear 1
01 and the platen drive gear 102 are fixed respectively.

The paper feeding drive gear 100 meshes with a small diameter intermediate gear 104 via a large diameter intermediate gear 103.

This small diameter intermediate gear +04 is a driving force switching mechanism 1 which will be described later.
40, the first shift gear 107, which is always biased outwardly via the compression coil spring 106, moves inward from the neutral state (toward the rear plate 3b side) against the compression force of the compression coil spring 106. They are designed to engage when you do so. This first shift gear 107 is configured to reciprocate in three positions, outer, neutral, and inner, as described above, by the driving force switching mechanism 140, and is connected to the large diameter gear portion 108a and the platen drive gear! The intermediate gear 108 consists of a small diameter gear part 108b which is meshed with the large diameter gear part 108a.

The large diameter gear part of this intermediate gear 108! 08a is a second drive force which is constantly biased outward via a compression coil spring 110 to the sleeve 109 via a second driving force switching mechanism 150 which will be described later.
It meshes with the small diameter gear portion 111a of shift gear III. The large-diameter double gear portion 111b of the second shift gear I11 is configured such that the second shift gear III is moved inward (rear plate 3b) against the compression force of the compression coil spring 110 by the second driving force switching mechanism 150. side), the stepping motor (second drive source) II2 warms up!
It is designed to mesh with 13.

Furthermore, the small diameter gear portion 111 of this second shift gear 21
a is meshed with the paper discharge roller drive gear 101 via a pinion 114.

Further, when the first shift gear 107 is moved outward by the compression force of the compression coil spring 106 by the drive force switching mechanism 140, it meshes with the limiter gear 99 of the take-up drive reel stand 94 via the intermediate gear l15. The winding drive reel stand 94 is rotated by the winding drive reel stand 94.

A head drive gear 12 is provided at the end of the drive shaft 8o of the head moving mechanism 71 outside the rear plate 3b of the inner yarn 3.
It is fixed at 0. This head drive gear 120 meshes with the small diameter gear portion 121b of the head idler gear 121, which includes a large diameter gear portion 121a and a small diameter gear iI<121b. Large diameter gear portion 1 of this head idler gear 121
21a is a stepping motor (first drive source) 122
A large diameter worm gear 124a that meshes with the worm 123 of
It meshes with the small diameter gear portion 124b of the intermediate gear +24, which is composed of a small diameter gear portion +24b, and is rotatable by the driving force of the stepping motor 122.

At a predetermined position on the side surface of the head drive gear 120 on the side of the rear plate 3b, there is an actuation plate +2 for rotating the paper discharge pushing claw 60.
Insert and engage the protruding pin +26 at one end of 5.

The actuating plate 125 is formed into a long L-shaped plate, and pins 127 each have long holes 125a, 125b, and 125c formed long in the longitudinal direction on both sides and the upper part of the rear plate 3b. , 128, 129 are inserted through the support so that they can be reciprocated in the longitudinal direction.

Further, a rotating plate 63 of the discharge sheet pushing claw 60 is supported by a pin on the upper bent portion 125d of the operating plate 125. As a result, the actuating plate +25 moves back toward the head drive gear 120, as shown by the two-dot chain line in FIG. The high bottom part of the paper output tray receiver 6 is inserted into the pair of openings 6d, 6d of the paper output tray receiver 6 and moved forward as shown by the solid line in FIG. It protrudes above 6a.

In addition, an eject stopper (prohibited Means) The base of 130 is pivoted. This eject stopper 130 is formed into an arm plate shape, and has a long hole 1 formed in the longitudinal direction at the center.
A pin 131 protruding from the actuating plate +25 is inserted into 30a and engaged. As a result, when the actuating plate 125 moves back and forth, the eject stopper 130 swings as shown by the solid line and the two-dot chain line in FIG.
By holding the hook portion 32d of the lock plate 32 in a protruding state during the backward movement of the actuating plate 12.5, the feeder that is attached to the printer body 2 and locked by the locking mechanism 30 during paper feeding, printing, etc. This is designed to prevent the paper tray 20 from being unexpectedly unlocked.

Moreover, the large diameter gear portion 12 of the above-mentioned Herad idler gear +21
The outer surface of 1a has a protrusion 121c and a 7-shaped cam surface 1.
21d and a recess 121e are formed respectively. Above protrusion! 21c and cam surface +21d, there are brake arms 1 for the driven reel stand for supply and the drive reel stand for take-up.
The base end portions 132a and 133a of 32 and 133 are in contact with each other. Each of these brake arms 132. tja is formed in a dogleg shape and is rotatably supported via respective support shafts 134 and 135. Also, each brake arm 132.13
The base of 3 and the idler gear! Each tension coil spring 137 is connected between the spindle +36 which rotatably supports the
, 138 are interposed therebetween, and the tip portion 132b, I'3
3b is each roll stand 93. ,94 limiter gear 98
．． It meshes with 99.

They are free to defect.

Go, Configuration of Driving Force Switching Mechanism The driving force switching mechanism 140 includes a small diameter gear portion 141 that meshes with the head idler gear 121 and a cam surface 14 that is uneven on one side.
A cam gear 143 consisting of a large diameter cam portion 142 having a diameter of 2a.
A rod-shaped support part 145a is rotatably supported by a U-shaped mounting plate 144 fixed to the rear Fi, 3b of the inner chassis 3, and one end 145b side is in contact with the cam surface 142a of the cam gear 143. , the leaf spring portion 146 on the other end side is brought into contact with one side of the first shift gear 107, and due to the unevenness of the cam surface 142a, the leaf spring portion 146 moves the shift gear 107 into three positions: outside, neutral, and inside. It is composed of a shift lever 145 to be moved.

A pair of pin portions 141a, 141a are protruded from one side of the small diameter gear portion 141 of the cam gear 143. A base 149a of an L-shaped lock arm 149 rotatably supported by a U-shaped mounting plate 147 fixed to the mounting plate 95 via a spring 148 is attached to the pair of pin parts 141a, 141a. It is connected to 1M freely. This base 149
When +lL comes into contact with the pair of bottles 141a, 141a, the side of the claw portion 149b that was engaged with the supply driven reel stand 93 at its tip resists the biasing force of the spring 148, and the limiter gear 98 of the reel stand 93 locking part 98
a, and the reel stand 93 rotates.

The second driving force switching mechanism 150 is a head idler gear 1
A hook-shaped tip 15 that is inserted into and separated from the recess 121e of 21
1a, a hole 151b formed in the center, and a pin portion 151c protruding from the base. , a pin portion 152b that protrudes upward and downward from the central portion.
One of the intermediate operating levers 152 is pivoted to the hole 151b of the operating lever 151, and the other pin part 151b is pivoted to the mounting plate 95. A rod-shaped support part 153c is rotatably supported on the bracket part 95a, and one end thereof +53
a into the elongated hole 152a of the intermediate operating lever 152,
By engaging the plate spring portion 153b on the other end side with one side of the second shift gear 111, the operating lever 1
51 causes the plate spring portion 153b to shift the shift gear I.
It is composed of a shift lever +53 that moves the ll to two positions: outside and inside.

G10. Effects of the Embodiment According to the printer l of the embodiment, as shown in FIG.
(including when loading/unloading the ribbon cartridge 85 or jamming the print paper 8), the paper feed roller 38 of the paper feed mechanism 10 is tilted downward, and the paper ejection push-out claw 60 is placed in the high position of the paper ejection tray holder 6. It protrudes above the bottom portion 6a.

At this time, as shown in FIGS. 27 and 28, the first shift gear 107 is in the neutral position, and the second shift gear 107 is in the neutral position.
The shift gear 111 is located at a position away from the worm +13 of the stepping motor l12.

From this state, as shown in FIGS. 18 and 19, when the paper feed tray 20 is attached to the paper feed tray receiver 5, the paper feed tray 20 is attached to the lock mechanism 30 as shown in FIG. 20(c).
locks it in its attached state. At this time, the hook portion 32b of the locking mechanism 30 projects outward from the rear plate 3b, as shown in FIG. 29. Then, when a print button (not shown) is pressed, the stepping motor 122 is driven, and the head drive gear 120 and the like are rotated. Due to the rotation of this head drive gear 120, etc., as shown in FIGS. 29 and 30,
The first shift gear 107 is connected to the driving force switching mechanism 140
moves to the outer position and meshes with the limiter gear 99 of the take-up drive reel stand 94 via the intermediate gear
As shown in the figure, while the ink ribbon 86 is being indexed, the second shift gear 111 is switched from the stepping motor 112 to the stepping motor 112 by the second driving force switching mechanism 150.
13, the platen 14 and the paper ejection roller 12 rotate (the second soft gear 112 remains in this position until the paper is ejected). When starting the ink ribbon 86, the brake arm 132 of the feed follower table 93.
The lock arm 149 and the brake arm 133 of the take-up drive reel stand 94 are turned off, and the ink ribbon 86
cueing is done smoothly. Further, the head drive gear 120 causes the actuating plate 125 to move forward, and the locking mechanism 3
The eject stopper 130 is locked to the hook portion 32b of the paper feed tray 20, making it impossible to release the locked state of the paper feed tray 20. This prevents the paper feed tray 20 from being accidentally removed during subsequent paper feeding, printing, and the like. Further, due to the forward movement of the actuating plate +25, the pair of paper pushing parts 60a, 60a of the paper ejection pushing claw 60 move from above the high bottom 6a of the paper ejection tray receiver 6 into the pair of openings 6d, 6d of the rear part 6C. Immerse yourself. The paper ejecting push-out claw 60 remains in this state until the paper is ejected.

The stepping motor 122 drives the first shift gear +07 via the driving force switching mechanism 140 and the like.
, as shown in FIG. 31, moves to the inner position and meshes with the paper feed roller drive gear 100 of the paper feed mechanism IO via the intermediate gears 103, 104. This rotation of the paper feeding roller drive gear 100 causes the drive shaft 11 to rotate in the direction of the arrow in FIG. This causes the paper feed roller 38 to move upward via the pair of arm members 36, 36 and each first limiter 39, 39. Further, when the drive shaft 11 rotates, the paper feed roller 38 comes into pressure contact with the back surface of the lowest print paper 8 exposed from the opening 24 of the paper feed tray 20, as shown in FIGS. 22 and 24. Then, as the drive shaft +1 rotates, the paper feed roller 38 rotates while being pressed against the back surface of the print paper 8 through the second limiter 43 with a stable pressing force without slipping, so that the print paper 8 is rotated. Paper is fed to the platen 14 reliably and always in a stable state. Note that during this paper feeding, the brake arm 1
32, 133 and lock arm 149 are in the on state.

The print paper 8 that has reached the platen 14 is wound around the circumferential surface of the platen 14 with both ends of the print paper 8 overlapping as the print 14 rotates in the direction of the arrow in FIG. Furthermore, this print paper 8
When loading, the first shift gear 107
As shown in FIG. 33, it is located at a neutral position.

This completes the series of paper feeding operations.

Next, when the head drive gear 120 is rotated by the driving of the stepping motor +22, the thermal head 70 is moved by the head moving mechanism 71 to press the ink ribbon 86 against the platen 14, as shown in FIG. At this time, as shown in FIG. 35, the first shift gear 107 is located at the outer position, similar to when the ink ribbon 86 is started, and rotates the take-up drive reel stand 94. At this time, the brake arm 133 and the lock arm 149 are turned off, but the brake arm 132 remains on, and an appropriate brake is applied to the supply driven reel stand 93 during printing to prevent it from idling, and the ink ribbon Appropriate pack tensing is given to 86. From this state
(yellow), 1M (magenta), and C (cyan) are printed.

When printing on the print paper 8 is completed, as shown in FIG. 26, the platen 14 rotates in the opposite direction to the direction in which the paper was fed, and the paper is conveyed and ejected onto the paper ejection tray receiver 6 by the paper ejection roller 13, and the paper is ejected to the rear part. 6c and guide piece 6e, and is set on the high bottom 3a of the paper discharge tray receiver 6. At the time of this paper discharge, as shown in FIG. 33, the first shift gear! 07 is in a neutral position, and only the platen 14 and the paper discharge roller 13 are rotated by the stepping motor 112. Thereafter, as the actuating plate 125 moves back, the pair of paper extruding parts 60a, 60a of the paper ejecting pawl 60 interlocked with the actuating plate 125 return to their original positions, and exit from the pair of openings 6d, 6d. By protruding, the printed paper 8 set on the high bottom portion 6a is pushed out onto the paper discharge tray 64, and the paper discharge operation is completed.

In this way 1. A drive shaft 11. The paper feed roller 38 is brought into pressure contact with the paper feed roller 38 via the second limiter 43, and the print paper 8 is conveyed so that the back side of the paper is in contact with the peripheral surface of the platen 14, and the print paper 8 is transferred from the lower side of the paper feed tray 20 to the platen 14. By feeding the paper, the print paper 8 can be fed to the platen 14 smoothly and reliably.

Furthermore, as described above, the paper feed roller 38 moves to press against the print paper 8 from below the paper feed tray 20 and feeds the print paper 8 to the platen i4. Since there is no need to separately provide means such as a moving mechanism for pressing the paper feed roller and the print paper in contact with each other in the printer body 2 or in the printer body 2, the structure is simplified and costs can be reduced. Therefore, the paper feed tray 20 and the printer main body 2 can be made thinner, so that the printer 1 can be made even thinner and lighter.

Furthermore, since the paper feed roller 38 moves in the vertical direction, the paper feed roller 38 does not get in the way when the paper feed tray 20 is inserted into and taken out from the paper feed tray receiver 5, and the operation of inserting and removing the paper feed tray 20 is performed. can be easily done.

H1 Effects of the Invention As described above, according to the present invention, the paper feed mechanism for conveying the print paper to the printing section disposed in the printer body is connected to a drive shaft disposed in the printer body and rotated by a drive source. , a rotating shaft that revolves due to the rotation of this drive shaft, a paper feed roller that is provided on this rotating shaft and that conveys printer paper one sheet at a time to the printing section, and a paper feeding roller that is interposed between these driving shafts and the rotating shaft, and that rotates. Since it is configured with a limiter that controls the torque of the shaft, the paper feed roller can be moved to press against and away from the back side of the print paper in the paper feed tray by the two drive shafts, and the paper feed roller While the print paper can be reliably conveyed to the printing section when the rollers are pressed against each other, the paper feeding mechanism can be simplified. Further, the paper feed roller rotates while being pressed against the back surface of the print paper without slipping through the limiter, so that the print paper can always be stably fed to the printing section.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view of the main parts of the printer main body of a printer showing an embodiment of the present invention, FIG. 2 is a perspective view of the main parts, and FIG.
The figure is a rear view of the same, Fig. 4 is a schematic side view of the same, Fig. 5 is a plan view of the paper feed tray holder, Fig. 6 is a sectional view along the line Vl-■ in Fig. 5, and Fig. 7 is a paper feed tray holder. A perspective view of the tray, FIG. 8 is a perspective view of the main part of the lock part of the paper feed tray, FIG. 9 is a perspective view of the paper feed mechanism, FIG. 10 is a sectional view of the paper feed mechanism, and FIG. 1.1 is a head A partial perspective view of the moving mechanism, FIG. 12 is a schematic perspective view of the main parts of the head moving mechanism, FIG. 13 is a side view of the head moving mechanism, FIG. 14 is a rear view of the head moving mechanism, and FIG. 15 is a ribbon cartridge. FIG. 16 is a plan view of the drive system, FIG. 16 is an exploded perspective view of the entire drive system, FIG. 17 is a perspective view of the entire printer, FIG. 20(a), (b), (c), (d), and (e) are explanatory diagrams showing step by step locking and unlocking of the paper feeding tray. Fig. 21 is an explanatory diagram showing the state before paper feeding, Fig. 22 is an explanatory diagram showing the state during paper feeding, Fig. 23 is a schematic explanatory diagram showing the ink ribbon beginning position, and Fig. 24 is an explanatory diagram showing the state during paper feeding. FIG. 25 is a schematic explanatory diagram showing printing, FIG. 26 is a schematic explanatory diagram showing paper ejection, FIG. 27 is a bottom view of the main parts of the drive system at the initial stage, and FIG. 28 is an initial diagram. FIG. 29 is a bottom view of the main parts of the drive system when the ink ribbon is positioned, FIG. 30 is a side view of the main parts of the drive system when the ink ribbon is positioned, and FIG. 31 is a side view of the main parts of the drive system when the ink ribbon is positioned. Bottom view of the main parts of the drive system during paper feeding, No. 32
The figure is a side view of the main parts of the drive system during paper feeding, Fig. 33 is a bottom view of the main parts of the drive system during loading and paper ejection, and Fig. 34 is a side view of the main parts of the drive system during loading and paper ejection. Fig. 35 is a bottom view of the main parts of the drive system during printing, Fig. 36 is a side view of the main parts of the drive system during printing, Fig. 37 is a schematic illustration of jamming of print paper, and Fig. 38 is a conventional example. FIG. 39 is a schematic diagram showing the paper feeding state of a conventional printer. FIG. 39 is a schematic diagram showing the paper discharging state of the conventional printer. G... Printer, 2... Printer main body, 5... Paper feed tray receiver (paper feeding section), '7... Printing section, 8... Print paper, 10... Paper feeding mechanism, II.・・Drive shaft, 37
... Rotating shaft, 38... Paper feed roller, 39... Limiter, +12... Motor (drive source). Figure 5 Oblique view of Ray on 2゜ scale gamma paper (live drawing No. 70 IrrH diagram of the Ginbu structure Figure 10 Diagonal view of the main part of the spatula 1" movement mechanism Figure 13: Hedge movement Isogami Figure 14: Bu Rutogi's Jiiminde's Qi Luo I lighting diagram Figure 37v The long-legged line's intervention 9. Denmi and the final slide 2 Fig. 38 Figure 39 shows the final configuration of the conventional example

Claims (1)

[Claims] (1) In a printer in which a paper feeding section is arranged in the printer body facing the printing section, and the paper feeding section is equipped with a paper feeding mechanism that conveys printed paper to the printing section, the paper feeding mechanism is installed in the printer. , a drive shaft provided in the printer body and rotated by a drive source, a rotation shaft that revolves around the rotation of this drive shaft, and a feeder provided on this rotation shaft to convey printer paper one sheet at a time to the printing section. A printer comprising a paper roller and a limiter interposed between a drive shaft and a rotating shaft to control the torque of the rotating shaft.