JPH082028A - Printer - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to simplify the mechanism of the video printer to a small size. [Structure] A concave portion and a flat surface are alternately arranged on the outer circumference of the main cam 36.
When the platen control roller 42 is provided in a concave portion and has a recess, there is a gap between the platen roller 11 and the thermal head 10,
When the image receiving paper is cued and the surface is flat, the image receiving paper is pressed, and three-color printing is performed while the main cam makes one revolution.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to printers for video and the like.

[0002]

2. Description of the Related Art In recent years, full-color video printers have been rapidly spread due to the advent of thermal transfer type printers. An example of the conventional thermal transfer type video printer described above will be described below with reference to the drawings.

21, FIG. 22, FIG. 23, FIG. 24, FIG.
And FIG. 26 is an explanatory view showing an outline of the configuration of a conventional thermal transfer printer. 21 is a plan view, FIG. 22 is a front view, and FIG.
3 is a plan view of the frame assembly of the mechanism, FIG. 24 is a front view of the frame assembly of the mechanism, FIG. 25 is a layout diagram showing a schematic plan view of the mechanism, and FIG. 26 is a layout diagram showing a schematic overview of the mechanism.

In these drawings, 1 is a top panel, 2 is a bottom panel, 3 is a front panel, and has a paper cassette, a ribbon cassette, an image receiving paper outlet, and an outlet when the image receiving paper is jammed. . Four
Is the rear panel and these panels make up the exterior part. 5
Is a paper cassette in which a plurality of image receiving papers are mounted, is inserted from the front surface of the front panel 3, and is engaged with a switch (not shown) to complete the setting. 6 is a ribbon cassette, Yellow,
Built-in ribbon coated with magenta and cyan dyes,
Equipped with a supply reel and a take-up reel, 100 sheets of image receiving paper can be printed. When the print head is in the printing state, the thermal head passes between the reels, so that the reel interval is large. Then, the ribbon cassette 6 is also inserted from the front surface of the front panel 3 and engages with a switch (not shown) to complete the setting. A printer mechanism assembly 7 is attached to the bottom panel 2.

Reference numeral 8 is a pre-mechanism substrate, 9 is a post-mechanism substrate, 10 is a mechanism bottom substrate, and 11 is a mechanism top substrate. These pre-mechanism substrate 8, post-mechanism substrate 9, mechanism bottom substrate 10 and mechanism top substrate 11 are shown.
To form a base for assembling the mechanism (FIGS. 22 and 23). A paper stocker support plate 12 is attached to the mechanism bottom substrate 10. 13 is a ribbon cassette left guide plate, 14 is a ribbon cassette right guide plate (the lower part also serves as a paper guide part), 15 is a ribbon guide plate, and 16 is a paper guide plate, which are side surfaces of the mechanism front substrate 8 and the mechanism rear substrate 9, respectively. Is attached to.

A thermal head 17 has an initial position 17a.
And the rotation pressing position 17b of the platen roller are transferred (the thermal head and the platen roller constitute the recording means). A rotating plate a 17c supports the thermal head at its left end and rotates about a shaft 17d at its right end. The shaft 17d is fixed to the side surfaces of the mechanism front substrate 10 and the mechanism rear substrate 11. Reference numeral 18 denotes an image receiving paper, which is pushed up from an initial position 18a to supply a paper feed start position 18b and a print start position 18
Then, the sheet is moved to the sheet discharge end position 18d.

A platen roller 19 contacts the thermal head via the image receiving paper and the ribbon. Both ends are supported by side bearings of the mechanism front substrate 8 and the mechanism rear substrate 9. Reference numeral 20 denotes a capstan roller, which accurately feeds the image receiving paper in conjunction with the pulse motor. Both ends of the capstan roller 20 are supported by the side bearings of the mechanism front substrate 8 and the mechanism rear substrate 9. 21
Is a pinch roller, and presses the capstan roller 20 via the image receiving paper. Then, the initial position 21a and the rotational pressing position 21b of the pinch roller 21 are transferred (the capstan roller 20 and the pinch roller 21 constitute a paper conveying means).
A rotating plate b 21c supports the pinch roller 21 at the right end and rotates about a shaft 21d at the left end. 22 is a mode motor, 23 is a pulse motor for rotating the capstan roller 20 and the paper feeding device, 24 is a paper push-up plate, and the shaft 2
5 is rotated around the initial position 24a and the position 24b where the image receiving paper is pressed against the picker roller. Incidentally, both ends of the shaft 25 are supported by the side bearings of the mechanism front substrate 8 and the mechanism rear substrate 9. Reference numeral 26 is a paper push-up follower plate, which is rotated about the left end as a fulcrum between an initial position 26a and a position 26b where the image receiving paper is pressed against the picker roller.

Reference numeral 27 is a picker roller, and 28 is a separate roller, both ends of which are supported by side bearings of the mechanism front substrate 8 and the mechanism rear substrate 9 to rotate to transfer the image receiving paper (paper push-up plate 24, paper push-up follower). The plate 26, the picker roller 27, and the separate roller 28 constitute a sheet feeding means).
A reverse roller 29 holds the image receiving paper together with the separate roller 28 and rotates in the opposite direction to the separate roller 28 to prevent the transfer of the second image receiving paper stacked in the paper cassette 5 (the reverse roller and the separate roller 28). The roller 29 constitutes a reversing paper separating means).

Reference numeral 30 denotes a switching plate, which is a position for ejecting guide 30.
It rotates between a and the guide position 30b to the printing position. Further, when the image receiving paper is fed and the capstan is reversed and returned, the image receiving paper is guided in the paper discharge direction. Reference numeral 31 is a paper discharge roller, and 32 is a paper discharge driven roller, both of which sandwich the image receiving paper and transfer it to the stocker. 33 is a stocker of discharged image receiving paper, 34 is an intermediate gear, 35 is a torque limiter, and the image receiving paper is separated by a separate roller 28 and a reverse roller 29 at the time of paper feeding.
The reverse rotation torque is restricted so that it can be sandwiched between Three
6 and 37 are idler gears that connect the discharge roller gear and the picker roller gear, and 38 is a take-up reel friction clutch.
Torque is regulated at 600 g-cm. Reference numeral 39 is a supply reel friction clutch which regulates torque at 100 g-cm. A gear is provided at the outer front end of the substrate 9 after the mechanism of each roller. Further, each roller is supported by side holes of the front substrate 8 and the rear substrate 9 of the mechanism.

The operation of the conventional thermal transfer video printer thus constructed will be described below. First, as shown in FIG. 22, the paper cassette 5 and the ribbon cassette 6 are inserted and set inside the insertion opening of the front panel 3. Next, the mode motor 22 starts to operate, the main cam gear (not shown) attached to the side surface of the rear plate 9 of the mechanism also rotates, and as shown in FIG. To the pressing position 24b from the initial position 24a, and at that position the mode motor 2
2 stops. Meanwhile, the paper push-up plate 24 pushes up the paper push-up follower plate 26, the paper push-up follower plate 26 rotates from the initial position 26a to the paper feed start position 26b, and the image receiving paper also moves to the initial position 18
The paper feed start position 18b is shifted from a. Next, the pulse motor 23 starts to operate, the capstan roller 20 gear, the intermediate gear 34, the separate roller gear, and the idler gear 36, which are interlocked with the timing belt, rotate, and the picker roller gear engaged with it also rotates counterclockwise. Rotate. Therefore, the picker roller 27 also rotates counterclockwise. In this state, since the image receiving paper is pressed against the picker roller 27 at the position 18b, it moves rightward from the paper feed start position 18b, first enters between the separate roller 28 and the reverse row 29, and is still fed. Switching plate 3
0 (30b), and reaches the position where it is nipped by the capstan roller 20 and the pinch roller 21. During this time,
The reverse roller 29 blocks the transfer of the second image receiving sheet.

After that, the paper push-up plate 24 and the paper push-up follower plate 2
6 is lowered, and the pinch roller 21 is rotated and pressed to the position 21.
As the image receiving paper is transferred to the capstan roller 20
It is pinched by the pinch roller 21 and the right end of the image receiving paper slides on the surface of the mechanism bottom plate 3 and is in a substantially horizontal state.
The image is sent to the print start position 18c. In this way, the entire mechanism is so large that the image receiving paper is cured in a substantially horizontal state. Therefore, the image receiving paper outlet for jamming is installed on the front side.

Next, the mode motor 22 is re-activated, the thermal head 17 moves from the initial position 17a to the position 17b where it is pressed against the platen roller, and then the capstan roller 20 is rotated in the reverse direction to move the image receiving paper leftward. At the same time as the transfer, a take-up reel friction clutch 3 is driven by a motor (not shown).
8 rotates, the ribbon is also wound and the transfer starts to the left. Then, the thermal transfer of the first yellow print image by the thermal head 17 is performed. When the image receiving paper is moved to the left, the switching plate 30 is in the discharge guide position 30a and moves upward.

When the printing of yellow is completed, the thermal head 17 moves upward, the supply reel friction clutch 39 is rotated by a motor (not shown), and the slack ribbon is wound to the right and stretched. After that, the image receiving paper returns to the printing start position 18c. Subsequently, the magenta stamp screen thermal transfer is performed, and similarly, the cyan stamp screen thermal transfer is performed next. When the transfer of the yellow, magenta, and cyan dyes is completed, the image receiving paper is sandwiched between the paper discharge roller 31 and the paper discharge driven roller 32, and is discharged onto the paper stocker support plate 12.

[0014]

However, in the above-mentioned structure, the image-receiving paper drive motor for printing and paper feeding,
A ribbon winding motor, a drive motor such as a thermal head, and three motors are used, and each motor is provided with a drive component, which is complicated and expensive, and the mechanism is large.

In view of the above problems, the present invention provides a printer for a thermal transfer type video device, which is small in size and has a rational structure.

[0016]

In order to solve the above problems, the printer of the first invention is provided with a printer device substrate, a thermal head, and the thermal head so as to be able to come in contact with each other via an image receiving paper and a ribbon. A platen roller, a platen driving means including a platen control plate having a main cam having a concave portion and an upper surface flat portion on the outer periphery for abutting the thermal head and the platen roller, and a platen driving means for transferring the image receiving paper. A configuration including a paper transfer unit, a cassette containing a ribbon coated with dyes of yellow, magenta, and cyan, a reel drive unit for transferring the ribbon, and a motor for driving each unit. And

According to a second aspect of the present invention, a platen roller bearing member for supporting the platen roller, a platen roller support plate, and a platen roller support means composed of a pressing spring for pulling the platen roller support plate and the platen roller support plate against each other with a necessary printing press, a thermal head and a platen roller are provided. A platen drive means composed of a main cam having a concave portion and a flat surface on the outer periphery for contact and a platen control plate having a platen control roller, a paper transfer means for transferring image receiving paper, and a ribbon coated with a dye. It is configured to include an internal cassette, reel driving means for transferring the ribbon, and a motor for driving each means.

A third aspect of the present invention comprises a platen driving means for contacting the thermal head and the platen roller, a main gear, a main cam, a main cam lock plate and a swing member, and the main cam is a continuous stop cam groove.
A one-way clutch means having a rocking cam groove and a return cam groove, engaged with the rocking plate, a paper transporting means for transporting an image receiving paper, a head position detecting mark and a ribbon coated with a dye. And a reel drive means for transferring the ribbon, and a motor for driving each means.

[0019]

In the structure of the first aspect of the present invention described above, when the platen control roller is in the concave portion on the outer periphery of the main cam,
When there is a gap between the platen roller and the thermal head, the image receiving paper is cued, and when the platen control roller is on the flat surface of the outer circumference of the main cam, the platen roller and the thermal head press the image receiving paper, and the main cam makes one revolution. Then, three-color printing of yellow, magenta, and cyan is performed.

Further, according to the second aspect of the invention, the platen roller bearing member, the platen roller support plate, and the platen roller support means composed of the pressing springs for pulling the platen roller support plate and the platen roller support plate against each other with the necessary printing pressure are provided, and the platen roller outer peripheral concave portion is provided with the platen roller support means. By moving the control roller up and down, the platen roller support plate is pushed up so that the platen roller is brought into the necessary printing pressure immediately after contact with the thermal head.

Further, in the structure of the third aspect of the invention, when the swing member is near the end of the swing cam groove of the main cam, the main cam lock plate is separated from the inner teeth of the main gear, and when the ink ribbon is moved to the head, the main cam moves. Only the ink ribbon is taken up when stopped.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A thermal transfer video printer according to an embodiment of the present invention will be described below with reference to the drawings.

1 to 20 are schematic configuration diagrams of a thermal transfer printer according to an embodiment of the present invention. 1 is a plan view of the video printer, FIG. 2 is a front view of the video printer,
FIG. 3 is a layout diagram showing a plan view of the mechanism, FIG.
Is a layout diagram showing an outline of the front of the mechanism, and FIG. 5 is an exploded view of the basic block. 6 is an exploded view of the picker cam block, FIG. 7 is a detailed view showing the ribbon path, FIG. 8 is an explanatory view showing the position movement state of the platen roller, FIG. 9 is an exploded view showing the drive block of the platen roller, and FIG. 10 is an image receiving image. FIG. 11 is an explanatory view showing a position state of paper, FIG. 11 is a system diagram of a two-series gear group that transmits rotation of a motor, FIG. 12 is an explanatory view showing a position movement state of a picker roller and a paper pressing member by rotation of a picker cam, and FIG. 13 is a picker cam. Related exploded view, FIG. 14 is an explanatory view showing a position movement state related to the picker lock plate, FIG. 15 is an explanatory view showing a position movement state related to the main cam lock plate, FIG. 16 is an exploded view related to the main cam, and FIG. FIG. 18 is an explanatory view showing the position movement state of the plate, FIG. 18 is a layout diagram of the winding friction clutch, and FIGS. 19 and 20 are positions of the winding stoppers due to rotation of the winding friction clutch. It is an explanatory view showing a dynamic state.

In these drawings, reference numeral 1 denotes a top panel, which has an insertion port for a paper cassette, a paper stocker, and a ribbon cassette. Reference numeral 2 denotes a bottom panel on which a mechanism block is mounted and which constitutes an exterior part (FIGS. 1 and 2). A paper stocker 3 stores image receiving paper after printing and is rotatably supported by the bottom panel 2 so that it can be pulled out. A paper cassette 4 is equipped with a plurality of image receiving papers and is inserted from the front surface of the top panel 1. And with a slit at the bottom of the right end, when the picker roller support plate is raised, the lowermost image receiving paper is transferred by the picker roller,
Further, the picker roller support plate is engaged and cannot be pulled out (FIGS. 1 and 2). 5 is a ribbon cassette, which is a guide portion 5a, a guide portion 5b, a guide portion 5c, and a side surface portion 5d.
And a built-in ribbon 48 with a detection mark coated with yellow, magenta, and cyan dyes.
1 and a take-up reel 50, 50 sheets of image receiving paper can be printed. Then, it is inserted from the front surface of the top panel 1 and installed in the mechanism assembly 6 (FIGS. 1 and 2). Ribbon 4
Reference numeral 8 denotes a guide portion 5a to a heating element portion 1 of the thermal head 10.
It is pulled upward through the lower surface of 0a by the guide portion 5b and leftward by the guide portion 5c and wound up by the take-up reel 50 (FIG. 7). At the side surface portion 5d, when the paper push plate descends, the ribbon cassette 5 cannot be released by engaging with the paper push follower plate 25 (FIG. 4).

Reference numeral 6 denotes a mechanism assembly of the printer, which is attached to the bottom panel 2 (FIG. 2). 7 is a mechanism substrate on which gears, base bearings, etc. are attached (Fig. 4). Reference numeral 8 denotes a base shaft, which serves as a center of rotation of the platen roller, the picker roller, the pinch roller support plates, and the switching plate (FIG. 5). 8g is idler gear,
It is provided at the tip of the base shaft 8 and transmits the rotation of the capstan gear 17 to the picker gear 19g (FIG. 11). Reference numeral 9 is a base bearing, and the bearing portion 9 of the capstan roller is at the right end.
a, a bearing portion 9b for the base shaft, and a claw-like hook portion 9 in the central portion.
c) (FIG. 6), and is attached to two side surface portions of the mechanism substrate 7.

A thermal head 10 has a row of heating elements 10a, a heat radiating board 10c with fins 10b, a flexible board 10d and a receptacle 10e (FIG. 7). It is pressed against the platen roller via. The fin 10b
Are in the same direction as the heating element 10a.

Reference numeral 11 denotes a platen roller which transfers between an initial position 11x and a rotational pressing position 11y (FIG. 8) (the thermal head and the platen roller constitute a recording means). A platen roller support plate 12 supports a platen roller pressing spring at its right end and rotates about the base shaft 8 at its left end hole. Thirteen
Is a platen roller bearing (platen roller bearing member)
The right end supports the platen roller and the other end of the platen roller pressing spring, the left end hole is fitted to the base shaft 8, and the platen roller support plate and the platen roller bearing are sandwiched by the platen roller pressing spring. (Fig. 9). Reference numeral 14 is a platen roller pressing spring, and 15 is an image receiving paper, which is pulled out from an initial position 15a and moved to a printing operation start position 15b and a discharge end position 15c (FIG. 1).
0).

A capstan roller 16 is provided with a spike-shaped projection on the outer peripheral portion thereof and works accurately with an FG-controlled motor to feed the image receiving paper. Both ends are fitted with the base bearing 9 of the mechanism substrate 7. Further, a capstan roller gear 17 is provided on the flexible tip (FIG. 6). Reference numeral 17 denotes a capstan roller gear, and the gear portion 17a includes a capstan roller intermediate gear 21, a take-up friction clutch gear portion 46b, and a gear portion 17b.
Is associated with the idler gear 8g and the gear portion 17c is associated with the pinion gear 30 (FIGS. 6 and 11). A pinch roller 18 is pressed against the capstan roller via the image receiving paper. Then, the image receiving paper is printed at the printing operation start position 15b (10
(Fig.) And then in the opposite direction for printing.

After the three-color printing is carried out, the image receiving paper is ejected after being transferred. (The capstan roller and the pinch roller constitute the second paper transporting means). Reference numeral 19 denotes a pinch roller support plate, which supports the pinch roller at the right end and fits on the base shaft 8 at the left end hole and rotates (FIG. 5). It is biased clockwise by a coil spring. 20 is a worm gear D
It is directly connected to the C motor and drives the capstan roller intermediate gear 21 and the main cam first intermediate gear 22 (FIG. 11).

Reference numeral 23 denotes an FG-controlled DC motor, which feeds, prints, and discharges by rotating in the forward and reverse directions (FIG. 11). Two
A paper pressing plate 4 presses the image receiving paper, and is supported by the paper pressing follower plate at the center and moves up and down between the initial position 24x and the position 24y for pressing the image receiving paper (FIG. 12). Reference numeral 25 is a paper pushing follower plate, which has a rotation center portion 25d at the right end and has an initial position 2
It rotates between 5x and the position 25y where the image receiving paper is pressed by the paper pressing plate (FIG. 12). In addition, the paper pushing plate support portion 25a is provided at the left end.
Further, the picker receiving portion 25b and the ribbon cassette locking portion 25c are provided at the center (FIG. 13). Further, it is biased counterclockwise by a coil spring.

Reference numeral 26 is a picker roller having a picker roller gear 26g at its tip, 27 is a picker roller support plate, which supports the picker roller 26 at the left end, and has a picker cam contact portion 27a and a paper pushing follower contact portion 27b at the right end portion. Further, it is provided with a cassette lock portion 27c (FIG. 13) and rotates around the base shaft 8 to move up and down between the initial position 27x and the image receiving paper pressing position 27y (FIG. 12). Therefore, the picker roller 26 also moves up and down between the initial position 26x and the image receiving paper pressing position 26y (FIG. 12). It is urged clockwise by a line spring.
The paper push plate 24 and the picker roller 26 are connected to 24y and 2 in FIG.
In the state of 6y, the image receiving paper 15a (FIG. 10) is fed by the rotation of the picker roller 26 and reaches a position where it is nipped by the capstan roller 16 and the pinch roller 18. Reference numeral 28 denotes a picker cam gear, which is rotatably installed coaxially with the capstan roller 16 and forms an inner tooth portion 28a and an outer tooth portion 28b (FIG. 6).

A pinion holding plate 29 is supported at the right end thereof coaxially with the capstan roller 16 and at the left end thereof by the base shaft 8. 30 is a pinion gear, which is a pinion holding plate 2
9, and is interposed between the gear portion 17c of the capstan roller gear 17 and the inner tooth portion 28a of the picker cam gear 28 (FIG. 6). And picker cam gear 28
Is reduced to 1/5 rotation of the capstan roller gear 17.

Reference numeral 31 is a picker cam, which comprises a drive portion 31a, a drive portion 31b, a drive portion 31c, a drive portion d, and a picker lock plate support portion 31e, and is rotatably attached to the capstan roller bearing portion 9a of the base bearing 9. (Fig. 6). Then, in the drive units 31a and 31b, the picker roller support plate 27 is pressed by the line spring, and the picker cam contact portion 2
It contacts 7b and works together (Fig. 13). (The paper pressing plate, the paper pressing follower plate, the picker roller, and the picker cam block constitute the first paper transfer means). Reference numeral 32 denotes a picker lock plate, which includes a resin spring portion 32a, a hook portion 32b, and an inclined portion 32.
c, and the rotation center portion 32d, which is a position slightly outside the external tooth portion 28b of the picker cam gear 28
A rotation center portion 32d is installed at e, and an elastic resin spring portion 32a at the upper end is pressed against the outer periphery of the outer tooth portion 28b of the picker cam gear 28 (FIGS. 6 and 1).
3). Further, the hook portion 32b at the lower end is the picker cam gear 2
Position 32x (FIG. 14) that has entered the external tooth portion 28b of FIG. 8 and the inclined portion 32c move to a position 32y that engages with the picker lock holding plate and is separated (FIG. 14) (paper transfer means by picker cam gear and picker lock plate). The second one-way Kurachi of. Reference numeral 33 denotes a picker lock holding plate, which includes a tip portion 33a, a tip portion 33b, a locking portion 33c, a locking portion d, and a rotation center portion 33e, and is pulled clockwise by a coil spring about the rotation center portion 33e ( (Fig. 13). The lock position 33x of the picker lock plate 32 and the picker lock plate 3
The release position 33y of No. 2 is rotated (FIG. 14).

Reference numeral 34 is a main cam lock holding plate (rocking member), which holds a holding portion 34a, a holding portion 34b, a holding portion 34c, and
It is composed of an engaging portion 34d and a rotation center portion 34e, and is pulled clockwise by a coil spring about the rotation center portion 34e (FIG. 13). Then, the release position 34x and the lock position 34y of the main cam lock plate 35 are rotated (see FIG. 1).
4, FIG. 15). Reference numeral 35 denotes a main cam lock plate, which is an engaging portion 3
5a, a hook portion 35b, and a rotation center portion 35d, which are pulled clockwise by a coil spring about the rotation center portion 35d (FIG. 16). Then, the release position 35x and the lock position 35y are rotated (FIG. 15) (the main cam gear and the main cam lock plate constitute the first one-way clutch of the platen driving means).

A main cam 36 is a cam groove portion 36a (stop cam groove portion), a cam groove portion b (swing cam groove portion), a cam groove portion c (return cam groove portion), a concave portion 36d, a concave portion 36e, and a concave portion 3.
6f, a flat surface portion 36g, and a rotation center portion 36h (FIG. 16), the cam groove portion engages with the engaging portion 34d of the main cam lock holding plate 34, and the concave portion and the flat surface portion are rollers attached to the platen roller control plate 41. 42 is driven (FIG. 9). Reference numeral 37 is a main cam shaft, and 38 is a main cam gear, which has an outer tooth portion 38a and an inner tooth portion 38b (FIG. 16), and is installed on the main cam shaft 37 together with the main cam 36 to rotate.

Reference numeral 39 is a main cam second intermediate gear, 40 is a main cam second intermediate gear shaft, 41 is a platen control plate, and comprises a tip portion 41a, a roller mounting portion 41b and a rotation center portion 41c (FIG. 9), and a wire spring. It is pressed against the upper surface of the main cam. Then, the initial position 41x and the platen pressing position 41y are rotated (FIG. 8).

Reference numeral 42 denotes a roller (platen control roller) which is installed in the roller mounting portion 41b. Reference numeral 43 is a platen control plate shaft (FIG. 9), and 44 is a paper gate, which is rotatably installed on the rotation shaft of the picker roller 26 and has a gap 44a through which only one image receiving sheet is passed, and the second sheet is blocked (FIG. 10). .

Reference numeral 45 is a switching plate, which rotates about the base shaft 8 to guide the paper discharge guide position 45x and the guide position 4 to the printing position.
It rotates between 5y (FIG. 17). When the image receiving paper is fed and the capstan roller is reversed and returned, the image receiving paper is guided in the paper discharge direction. Reference numeral 46 is a take-up friction clutch, which includes a coupling portion 46a, a gear portion 46b, and a ratchet portion 46c (FIG. 18). Further, the gear portion 46b is a friction clutch and can idle when a load is applied.

Reference numeral 47 is a winding stopper, the right end of which is attached to the sub-mechanism substrate 52, and engages with the ratchet portion 46c to prevent the winding friction clutch 46 from rotating when the DC motor 23 rotates in the reverse direction (FIG. 19). (The ratchet portion of the winding friction clutch and the winding stopper constitute the third one-way clutch of the reel driving means). Further, when the DC motor rotates forward, the tip of the winding stopper 47 escapes and the ratchet portion 46c rotates (FIG. 2).
0).

Reference numeral 48 is a ribbon, and 49 is a supply reel positioning link, which supports the supply reel 51 at a predetermined position while the take-up reel friction clutch 46 is a slip clutch against overload. 50 is a take-up reel,
Reference numeral 51 is a supply reel (FIG. 7), and 52 is a sub-mechanism substrate (FIG. 20) to which a thermal head or the like is attached. 5
A sensor 3 (FIG. 10) detects the right end of the image receiving paper 15. A circuit board 54 and a plug 55 are directly coupled to the receptacle 10e of the thermal head 10 (FIG. 7).

The operation of the thermal transfer video printer of the embodiment constructed as described above will be described below. (1) Preparation First, the paper cassette 4 and the ribbon cassette 5 are inserted inside the insertion opening of the top panel 1. At this time, the picker roller 26 is in the state of 26x (FIG. 12), and the paper cassette 4 and the ribbon cassette 5 are inserted without coming into contact with it. In addition, the take-up reel 50 and the supply reel 51
Is a coupling portion 46 of the take-up reel friction clutch 46.
a and the supply reel positioning link 49 are engaged. (2) Ribbon Cueing In the start operation, the DC motor 23 starts to rotate in the forward direction, and in conjunction with this, the worm gear 20, the capstan roller intermediate gear 21, and the capstan roller gear 1
7. The take-up reel friction clutch 46 and the take-up reel 49 rotate to wind the ribbon 48 (see FIG. 1).
1). Then, the ribbon 48 stops at a position where a sensor (not shown) detects the detection mark of the ribbon. The state of the main parts during this period will be described. 1) Picker cam 31 The picker cam gear 28 is rotating clockwise, and the hook portion 32b of the picker lock plate 32 escapes from the outer tooth portion 28b of the picker cam gear 28.
The picker cam 31 is stopped. 2) Picker roller 26 Since the picker cam contact portion 27b of the picker roller support plate 27 is at the position of the drive portion 31b of the picker cam 31, the picker roller 26 is separated from the image receiving paper 15 in the state of 26x (FIG. 12). 3) Paper push plate 24 Since the picker cam contact portion 27b of the picker roller support plate 27 is located at the drive portion 31b of the picker cam 31, the paper push plate 24 is separated from the image receiving paper 15 in the state of 24x (FIG. 12). 4) Main cam 36 Tip part 3 of picker lock holding plate 33
3c supports the holding portion 34a of the main cam lock holding plate 34, and the holding portion 34b is in the position rotated left in the state of 34x (FIGS. 14 and 15). And the main cam lock plate 35
The engaging portion 35a of the main cam lock plate 35 is pushed clockwise by the holding portion 34b and is rotating clockwise in the state of 35x.
5b is separated from the inner tooth portion 38b of the main cam gear 38 (FIG. 15). Therefore, the main cam first intermediate gear 22 and the second intermediate gear 3 are interlocked with the worm gear 20.
9 and the main cam gear 38 is rotating, but the main cam 36 is stopped. (3) Paper feeding When the head of the ribbon is finished, the DC motor 23 rotates in the reverse direction. In conjunction with this, the worm gear 20, the capstan roller intermediate gear 21, the capstan roller gear 1
7, and the gear portion 4 of the take-up reel friction clutch 46
6b rotates, but the ratchet portion 46c is locked by the winding stopper 47, and the connecting portion a and the ratchet portion 46c
The take-up reel 49 has stopped rotating (FIG. 1).
9). Further, since the picker cam gear 28 rotates counterclockwise, the hook portion 32b of the picker lock plate 32 enters the outer tooth portion 28b of the picker cam gear 28 and is pushed, and the picker cam 31 rotates counterclockwise. When the picker cam 31 rotates counterclockwise, the picker cam contact portion 27b of the picker roller support plate 27 descends from the position of the drive portion 31b of the picker cam 31 along 31c and down to the position 31d. Further, the picker cam 31 rotates, and 31
a first pushes the tip end portion 33a of the picker lock holding plate 33 and rotates the locking portion 33c upward, so that the holding portion 34a of the main cam lock holding plate 34 comes off and the release position 3
4x to the lock position 34y (see FIGS. 14 and 1).
5), the holding portion 34b enters under the locking portion 33d, and the tip portion 33b is locked at the lock position 33x of the picker lock plate 32.
To the release position 33y (FIG. 14). Next, it contacts the picker cam contact portion 27b. During this time, the picker roller 26 and the paper pressing plate 24 hold and press the image receiving paper 15, and the picker roller 31 is rotating, so the image receiving paper 15 is pulled out from the initial position (image receiving paper 15a), Eventually, it is nipped by the capstan roller 16 and the pinch roller 18. The picker cam 31 still rotates and the drive unit 31
a pushes up the picker cam contact portion 27b, and the drive portion 31b
Reach At this position, the picker roller 26 and the paper pressing plate 24 return to the initial state of 26x and 24x, and are separated from the image receiving paper 15 (FIG. 12).

Further, the picker cam 31 is rotated so that the inclined portion 32c of the picker lock plate 32 is moved to the picker lock holding plate 33.
The picker lock plate 32 rotates counterclockwise as it abuts the tip 33b of the release position 33y, and the hook 32b moves away from the external tooth 28b of the picker cam gear 28, so that the picker cam 31 stops (FIG. 14). From here, the image receiving paper 15 is transported to the right by the rotation of the capstan roller 16 and the pinch roller 18. And the sensor 53 receives the image receiving paper 1
Detecting the arrival of 5 and passing through the switching plate 45,
The switching plate 45 moves from the paper ejection guide position 45x to the printing position guide position 45y (FIG. 17), moves to the printing operation start position (image receiving paper 15b), and stops (FIG. 1).
0). (4) Printing The DC motor 23 rotates forward and the capstan roller 16
Rotates counterclockwise, the image receiving paper 15 at the printing operation start position (image receiving paper 15b) starts moving to the left.
Similarly, the ribbon is also wound on the take-up reel 50. Further, the main cam lock holding plate 34 is at the lock position 34y, and the main cam lock plate 35 is also at the lock position 35y (FIG. 15). Therefore, when the main cam gear 38 rotates counterclockwise, the inner teeth portion 38b pushes the hook portion 35b, and the main cam 36 also starts rotating counterclockwise.

First, the roller 42 in the recess 36d of the main cam 36 moves upward, the tip 41a of the platen drive plate 41 pushes up the platen roller support plate 12, and the platen roller 11 is rotationally pressed from the initial position 11x. Moving to the position 11y (FIG. 8), the image receiving paper 15 and the ribbon are pressed against the thermal head 10. When the roller 42 moves to the flat surface portion 36g of the main cam 36, the yellow printing starts, and the printing ends just before the recess 36e.

Continued rotation causes the roller 42 to fall into the recess 36e, and the DC motor 23 stops at this position, so that the main cam 36 also stops. In this state, the platen control plate 41 is at the initial position 41x, and the platen roller 11 is also lowered to the initial position 11x (FIG. 8). Next, the DC motor 23 reversely rotates, the image receiving paper 15 returns to the right direction again, and stops at the printing start position 15b.

Next, the DC motor 23 rotates in the normal direction, and the roller 42 moves upward from the concave portion 36e of the main cam 36 to move to the flat surface portion 36g as in the case of the yellow printing, and the magenta printing starts. The roller 42 is recessed 36f
The image receiving paper 15 returns to the printing start position 15b again. Finally, similarly, the roller 42 has the recess 36f.
To print a cyan image. After printing for a predetermined length, the main cam gear 38 and the main cam 36 continue to rotate for a while after that. (5) Paper discharge During this time, the engaging portion 34d of the main cam lock holding plate 34
Exists in the cam groove portion 36a of the main cam 36 for a while, and is pushed by the inclined portion of 36b later, and the main cam lock holding plate 34 returns to the release position 34x. And the holding part 3
4b passes through the locking portion 33d of the picker lock holding plate 33, the locking portion 33c rotates clockwise, and the holding portion 34a is supported by the locking portion 33c of the picker lock holding plate 33 and stops.

The main cam 36 further rotates and the main cam lock plate 35 rotating together approaches, and at this position, the engaging portion 35a of the main cam lock plate 35 comes into contact with the holding portion 34c, and the hook portion 35b becomes the main portion. The cam gear 38 is separated from the inner tooth portion 38b. The main cam 36 stops at this position. At the same time, the roller 42 moves the main cam 36
Into the recess d. At this time, the image receiving paper 15 is still held between the capstan roller 16 and the pinch roller 18, and is transferred to the left, so that the image receiving paper 15 is removed from the capstan roller 16. Then, the image receiving paper 15 is lowered to the paper stocker 3 and discharged.

As described above, according to this embodiment, the main cam has a structure that rotates only in one direction, and the main cam has a 3
When the platen control roller is located in the recess on the outer circumference of the main cam, there is a gap between the platen roller and the thermal head, and the image receiving paper is cueed and the platen control roller is set. Is on the outer peripheral flat surface of the main cam, the platen roller and the thermal head are configured to press the image receiving paper for printing, and three-color printing of yellow, magenta, and cyan is performed while the main cam makes one revolution in the same direction. be able to.

Further, in this embodiment, the platen roller bearing member and the platen roller support plate are attracted to each other by the pressing spring, the tension thereof is set to the pressing force required for printing, and the platen control roller is set at the outer peripheral concave portion of the main cam. By moving up and down, the platen roller support plate is pushed up, and immediately after the platen roller comes into contact with the thermal head, the pressure necessary for printing is reached.

Further, in this embodiment, a stop cam groove, a swing cam groove, and a return cam groove are provided on the upper surface of the main cam, and the swing member (main cam lock holding plate) serves as the main cam at the final stage of one rotation when the main cam starts moving. When oscillated by the oscillating cam groove and positioned near the end, the main cam lock plate on the main cam also makes one rotation and is locked by the protrusion of the oscillating plate and separated from the internal teeth of the main gear, and the main cam stops. Therefore,
Next, even if the main gear rotates, the main cam remains stopped, and only the ink ribbon is wound and the ink ribbon is cued. As described above, the present invention realizes a thermal transfer type video printer having a compact and rational structure.

[0050]

As is apparent from the above description of the embodiments, according to the present invention, when the platen control roller is in the concave portion on the outer periphery of the main cam, there is a gap between the platen roller and the thermal head, and the image receiving paper is cued out. When the platen control roller is on the outer peripheral flat surface of the main cam, the platen roller and the thermal head press the image receiving paper, and three-color printing of yellow, magenta, and cyan is performed while the main cam makes one revolution.

Further, according to the present invention, there is provided a platen roller bearing member, a platen roller support plate, and a platen roller support means composed of a pressing spring that pulls the platen roller support plate and the platen roller support plate against each other by a necessary press for printing. By doing so, the platen roller support plate is pushed up, and the platen roller is brought into the necessary printing pressure immediately after contact with the thermal head. Further, the present invention is
A stop cam groove, a swing cam groove, and a return cam groove are provided on the upper surface of the main cam.When the swing member is near the end of the swing cam groove of the main cam, separate the main cam lock plate from the inner teeth of the main gear to locate the ink ribbon head. Since the main cam is stopped at this time, printing and feeding of the image are performed by one motor, which makes the mechanism very inexpensive and compact.

As described above, according to the present invention, the printer mechanism can be miniaturized and simplified, and the number of assembling steps can be reduced, and its practical value is great.

[Brief description of drawings]

FIG. 1 is a plan view of a video printer according to an embodiment of the present invention.

FIG. 2 is a front view of the video printer.

FIG. 3 is a layout diagram showing an outline of a plane of the video printer mechanism.

FIG. 4 is a layout diagram showing a front outline of the video printer mechanism.

FIG. 5 is an exploded perspective view of a basic block of the video printer.

FIG. 6 is an exploded perspective view of a picker cam block of the video printer.

FIG. 7 is a side view showing a ribbon path of the video printer.

FIG. 8 is an explanatory diagram showing a position movement state of a platen roller of the video printer.

FIG. 9 is an exploded perspective view showing a drive block of the platen roller.

FIG. 10 is an explanatory view showing the position state of the image receiving paper in the video printer.

FIG. 11 is a system diagram of a two-series gear group that transmits rotation of a motor in the video printer.

FIG. 12 is an explanatory diagram showing a position movement state of a picker roller and a paper presser by rotation of a picker cam in the video printer.

FIG. 13 is an exploded perspective view of the same picker cam.

FIG. 14 is an explanatory view showing a position movement state related to the picker lock plate.

FIG. 15 is an explanatory diagram showing a position movement state related to a main cam lock plate in the video printer.

FIG. 16 is an exploded perspective view of the main cam.

FIG. 17 is an explanatory diagram showing a position movement state of a switching plate in the video printer.

FIG. 18 is a layout diagram of a take-up friction clutch in the video printer.

FIG. 19 is an explanatory view showing a position movement state of the winding stopper due to rotation of the winding friction clutch.

FIG. 20 is an explanatory view showing a position movement state of the winding stopper due to rotation of the winding friction clutch.

FIG. 21 is a plan view of a conventional video printer.

FIG. 22 is a front view of a conventional video printer.

FIG. 23 is a plan view of a frame of a conventional video printer mechanism.

FIG. 24 is a front view of a frame of a conventional video printer mechanism.

FIG. 25 is a layout diagram showing a schematic plan view of a mechanism of a conventional video printer.

FIG. 26 is a layout diagram showing a front outline of a mechanism of a conventional video printer.

[Explanation of symbols]

 7 Mechanism board 10 Thermal head 11 Platen roller 15 Image receiving paper 16 Capstan roller 18 Pinch roller 31 Picker cam 32 Picker lock plate 35 Main cam lock plate 36 Main cam

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taiichi Koyama 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A printer device substrate, a thermal head, a platen roller provided on the thermal head so as to be able to come in contact with the thermal head via an image receiving paper and a ribbon, and a concave portion on the outer periphery for abutting the thermal head and the platen roller. A platen drive means composed of a main cam having a flat upper surface and a platen control plate having a platen control roller in contact with the main cam, a paper transfer means for transferring the image receiving paper, and yellow, magenta, and cyan dyes A cassette containing the coated ribbon, a reel drive means for transferring the ribbon, and a motor for driving the respective means are provided, and when the platen control roller is in the concave portion on the outer periphery of the main cam, the platen roller is provided. There is a gap between the thermal head and the thermal head, the image receiving paper is cueed, and the platen control roller When it is on the carrier surface, the platen roller and thermal head press the image receiving paper, and the main cam moves to 1
A printer characterized by performing three-color printing of yellow, magenta, and cyan while going around. 2. A printer device substrate, a thermal head, a platen roller that is provided so as to be able to contact the thermal head via an image receiving paper and a ribbon, a platen roller bearing member that supports the platen roller, and a platen roller support plate. A platen roller support means composed of a pressing spring that pulls them against each other with a required printing pressure, a main cam having a concave portion and a flat top surface on the outer periphery for contacting the thermal head and the platen roller, and a platen control roller contacting the main cam. A platen drive means including a platen control plate, a paper transfer means for transferring the image receiving paper, a cassette containing a ribbon coated with a dye, a reel drive means for transferring the ribbon, and And a motor for driving the means, and the platen control by the outer peripheral recess of the main cam. A printer characterized in that the platen roller support plate is pushed up by moving the roller up and down so that the platen roller is pressed to print immediately after contact with the thermal head. 3. A printer device substrate, a thermal head, a platen roller provided on the thermal head so as to be able to come into contact with the thermal head via an image receiving paper and a ribbon, and a platen driving means for bringing the thermal head into contact with the platen roller. A main gear, a main cam, a main cam lock plate and a swing member, and the main cam has a continuous stop cam groove, a swing cam groove and a return cam groove, and one-way clutch means engaged with the swing plate. A paper transport means for transporting the image receiving paper, a cassette containing a cueing position detection mark and a ribbon coated with a dye, a reel drive means for transporting the ribbon, and each of the means for driving. A motor, and when the swing member is near the end of the swing cam groove of the main cam, the main cam lock plate is separated from the main gear internal teeth, A printer characterized in that the main cam stops when the ink ribbon is cued.