JP2537990Y2 - Printer - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention has a print head of an impact system by a printing wire and a type or a non-impact system by heat, injection and heat radiation, and a frictional force of a paper feed roller. Printer that performs printing while feeding cut sheet paper in the horizontal direction.

[Conventional technology]

Printers generally have a print head mounted on a carriage that moves in parallel with the platen on the upper side of a platen that holds paper to be printed, and a paper feed roller is arranged before and after the platen, and the cut sheet paper is moved forward. The printing is performed while the paper is fed in the horizontal direction from the printer through the printing unit.

As a first conventional example having the above configuration, Japanese Patent Application Laid-Open No. Sho 60-2149
No. 80, which will be described below with reference to the drawings. FIG. 21 is a schematic side view, in which 1 is a print head, 2 is a platen, and the print head 1 and the platen 2 constitute a printing section.

 Reference numeral 3 denotes a paper path, and 4 denotes a feeding roller.

The paper fed from the paper path 3 by the feed roller 4 from the direction of the arrow shown in the figure is printed by the print head 1 and discharged to the rear of the printing unit.

FIG. 22 is a schematic side view of a second conventional example, in which 5 is a print head, 6 is a platen, 7 is a paper path, and 8 is a return guide. Reference numeral 9 denotes a feed roller. The sheet fed from the sheet path 7 by the feed roller 9 in the direction of the arrow is printed by the print head 5, and the sheet is reversed by the return guide 8 at the rear of the print section, and the print section is returned again. And prints on the back surface with the print head 5 and feeds the paper in the direction opposite to the arrow and discharges it from the original supply port.

[Problems to be solved by the invention]

According to the prior art described above, in the former technique, the printed paper is ejected to the rear of the printing unit. Therefore, in the subsequent processing, for example, when the operator removes the printed paper, it must be removed through the apparatus. There is a problem that it is very difficult to take because it must be done.

Next, according to the latter technique, the printed paper can be taken out from the supply port in front of the operator, but the return guide behind the printing unit is complicated and large,
These become problems of the printer itself.

[Means for solving the problem]

In view of the above, the present invention provides a paper transporting means and a paper traveling path in which two rollers are pressed against a front side, which is a paper supply side of a printing section including a paper support section and a print head opposed thereto, and a rear side of the printing section. In the printer provided, a paper stop member for preventing travel of the paper at a distance shorter than a paper length used in the apparatus from a pressure contact position of the roller is provided on a paper traveling path behind the printing unit, and a paper conveying means behind the printing unit. Forming a sheet transporting means for returning a sheet pressed against another roller at a position lower and lower than the pressing position with the lower roller of the two rollers which are in contact with each other, and a lower portion of the sheet supporting portion. A paper chute is provided, and the rear end of the paper chute is arranged so as to follow the paper conveying means for returning the paper to the front, and further, the front end of the paper chute is provided in front of the apparatus. By linking the Detchi, characterized in that so as to discharge forward a paper returned by the sheet conveying means for returning the sheet forward through the paper chute and the paper discharge path.

[Action]

According to the above configuration, the paper on which printing has been completed can be sent to the paper chute by the paper transport means for returning the paper to the near side, and further sent by the paper discharge path to be discharged to the near side.

〔Example〕

 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view, and FIGS. 2 to 7 are side views of main parts showing an operation sequence. In the drawings, reference numeral 10 denotes a platen, and shafts 10a and 10b supported by side frames (not shown).
The platen gear 11 is rotatably supported on the shaft 10a.
Is locked.

Above the platen 10, a print mounted on a carriage 14 guided in parallel with the platen 10 by being guided by a first guide shaft 12 and a second guide shaft 13 locked to the side frame in parallel with the platen 10. It has a head 15 and an ink ribbon cartridge 16. At the tip of the ink ribbon cartridge 16, a ribbon protector 16a is provided.

A front paper guide 17 is provided at substantially the same height as the outer peripheral upper surface of the platen 10 in front of the platen 10,
Below the front paper guide 17, a first main feed roller 18 rotatably supported by the side frame is provided.
Of the front paper guide 17 projects through the opening of the front paper guide 17 to the upper surface of the front paper guide 17.

Above the front paper guide 17, a front paper guide upper 19 is arranged at a predetermined interval,
On the first main feed roller 18, a first sub-feed roller 20 is rotatably supported by the side frame so as to pass through an opening 19a of the front paper guide upper 19 and to be in the first sub-feed roller. The outer peripheral portion of the feed roller 20 is provided so as to contact the outer peripheral portion of the first main feed roller 18.

Next, a discharge paper guide 21 is disposed at substantially the same height as the outer peripheral lower surface of the first main feed roller 18, and the first main feed roller 18 passes through the opening of the discharge paper guide 21. Has an outer peripheral portion projecting downward. A discharge paper guide lower 22 is disposed below the discharge paper guide 21 at a predetermined interval, and a second sub-feed roller 23 is disposed below the first main feed roller 18. The outer peripheral portion of the second sub-feed roller 23 is rotatably supported by the side frame and passes through the opening of the discharge paper guide lower 22 so as to contact the outer peripheral portion of the first main feed roller 18. Are located in

A gear 24 attached to the shaft of the first main feed roller 18 meshes with a first idle gear 25, and the first idle gear 25
Idle gear 25 is in mesh with the platen gear 11. Therefore, the first main feed roller 18 rotates in the same direction in synchronization with the platen 10.

Next, a paper chute 26 is disposed below the platen 10 at a predetermined distance from the outer periphery of the platen 10. Further, a third sub-feed roller 27 is disposed below the platen 10, and the outer periphery of the third sub-feed roller 27 contacts the outer periphery of the platen 10 through the opening of the paper chute 26. .

Next, a rear paper guide 28 is disposed at substantially the same height as the front paper guide 17 behind the platen 10, and a second main feed roller 29 is provided below the rear paper guide 28. The outer periphery of the second main feed roller 29 projects through the opening of the rear paper guide 28 to the upper surface of the rear paper guide 28. Above the rear paper guide 28, a rear paper guide upper 30 is provided with a predetermined gap.

A fourth sub-feed roller 31 is disposed above the second main feed roller 29, and is in contact with the second main feed roller 29 through the opening 30b of the rear paper guide upper 30. .

Below the second main feed roller 29, a fifth sub-feed roller 32 rotatably supported by the side frame is disposed, and the fifth sub-feed roller 32 is Guide section 28 of rear paper guide 28
It is in contact with the outer peripheral portion of the second main feed roller 29 through the opening of b.

Further, a gear 33 is provided on the shaft of the second main feed roller 29, and meshes with a second idle gear 34, and the second idle gear 34 meshes with the platen gear 11. As a result, the second main feed roller 29 rotates in the same direction in synchronization with the platen 10.

Next, a paper traveling switching member 35 is disposed in front of the platen 10, and a shaft 35a on which the paper traveling switching member 35 is locked is rotatably supported by the side frame. A link 36 is locked to the shaft 35a, and the link 36 is further connected via a link 37 to a plunger magnet 38.
It is connected to. The link 36 above has a reset spring
One end of 39 is hung, this reset spring 39
Is locked to a post 40 provided on the side frame. As a result, the link 36 is urged to rotate counterclockwise. A drive gear 42 engaged with a shaft of a motor 41 meshes with the platen gear 11.

A shaft 43 rotatably supported by the side frame is provided above the rear paper guide upper 30, and a paper clamp arm 44 is attached to the shaft 43. The elastic member 45 such as rubber
An opening 30b is provided at a position of the rear paper guide upper 30 corresponding to the elastic member 45.

A link 46 is locked to an end of the shaft 43, a link 47 is connected to the link 46, and a plunger magnet 48 is connected to the link 47. One end of a spring 49 is engaged with the link 46, and the other end of the spring 49 is connected to a post 50 attached to a side frame.
, And urges the shaft 43 to rotate counterclockwise.

Next, the operation of the first embodiment having the above configuration will be described in detail with reference to FIGS.

As shown in FIG. 2, the paper 51 to be printed is inserted between the front paper guide 17 and the front paper guide upper 19,
The motor 41 is driven so that the platen 10 rotates clockwise. At this time, the motor 41 rotates counterclockwise. Thereby, the first and second main feed rollers
18 and 29 rotate clockwise, and the first main feed roller 18 and the first sub-feed roller 20 platen the paper 51.
The printing is performed by moving forward between the print head 15 and the print head 15.

When the paper 51 is further advanced, it reaches the second main feed roller 29 and the fourth sub-feed roller 31 and further advances, and when the rear end of the paper 51 passes the photo sensor 52, the plunger magnet 48 When the paper is sucked, the paper clamp arm 44 rotates clockwise about the shaft 43 as shown in FIG. 3, and the paper 51 is pressed and held by the elastic member 45 and stopped.

Therefore, when the motor 41 is further rotated in the same direction,
As shown in FIG. 4, the rear end of the paper 51 goes around the second main feed roller 29 and
The paper 51 enters between the second sub-feed roller 32 and the fifth sub-feed roller 32, and the paper 51 starts to retreat.

When the photo sensor 53 detects the trailing end of the sheet 51 that has been retracted, the suction of the plunger magnet 48 is released, and the sheet clamp arm 44 rotates counterclockwise to release the pressing of the sheet 51.

Further, the paper 51 is advanced backward, and when the rear end of the paper 51 is detected by the photo sensor 53, whether the plunger magnet 48 is kept in the released state or in the suction state depending on whether one-sided printing or two-sided printing is performed. Is selected.

In the case of single-sided printing, if the plunger magnet 48 is kept in the released state, the paper 51 is moved to the first main feed roller because the paper traveling path switching member 35 is located on the platen 10 side as shown in FIG. It is discharged by 18 and the second sub-feed roller 23.

In the case of double-sided printing, when the plunger magnet 48 is in the suction state, the paper traveling path switching member 35 is held at a position away from the platen 10 as shown in FIG. The paper 51 is fed by the second main feed roller 29 and the fourth sub-feed roller 31 after passing through the position of the print head 15 and the paper 51 as shown in FIG.
When the tip of the motor 41 passes through the photo sensor 52, the motor 41
Stops. At this time, the sheet 51 is turned upside down, and the surface on which printing is performed first is on the lower side, that is, on the platen 10 side.

Next, when the motor 41 is rotated in the opposite direction, the platen 10 and the first and second main feed rollers 18,
29 rotates counterclockwise, the paper 51 begins to retreat, passes the position of the print head 15, prints on the back of the paper 51, and prints the first main feed roller 18 and the first sub feed roller 20.
Is discharged by. With the above operation, double-sided printing of the paper 51 is completed.

Next, a second embodiment will be described with reference to the perspective view of FIG.

Since the second embodiment is substantially the same as the configuration of the first embodiment, only different points from the first embodiment will be described.

The rear paper guide upper is a rear paper guide upper 30 which is different from the flat shape of the rear paper guide upper 30 of the first embodiment, and as shown in FIG.
44, a curved portion 54 that is curved upward in a direction perpendicular to the traveling direction of the paper 51 is formed ahead of the position where the paper 51 is held.

The operation of the second embodiment having the above configuration will be described with reference to FIGS.
This will be described with reference to FIG.

The paper 51 is inserted between the first main feed roller 18 and the first sub feed roller 20, and is advanced to perform printing.
As shown in FIG. 9, when the rear end of the paper 51 has passed the photo sensor 52, the plunger magnet 48 is set in the attracted state, the paper clamp arm 44 rotates clockwise about the shaft 43, and the elastic member 45 When the paper 51 is pressed and held as it is, the paper 51 is stopped, and the paper 51 is further advanced, the paper 51 is moved along the curved portion 54 of the rear paper guide upper 30 as shown in FIG. The rear portion is curved upward, and the rear end of the paper 51 is the second main feed roller.
The second main feed roller 29 and the fifth main feed roller 29 are quickly and surely secured by the elastic force of the curved portion of the paper
And the subsequent operation is the same as that of the first embodiment.

Next, a third embodiment will be described with reference to the perspective view of FIG.

Since the third embodiment is almost the same as the configuration of the first embodiment, only different points from the first embodiment will be described.

The rear paper guide 28, the rear paper guide upper 30, the shaft 43 rotatably supported by the side frame, and the paper clamp arm attached to the shaft 43 in the first embodiment.
44, an elastic member 45 made of rubber or the like fixed to the end of the paper clamp arm 44, an opening 30b provided at a position corresponding to the elastic member 45 of the rear paper guide upper 30, and locked to the end of the shaft 43. Link 46, a link 47 connected to the link 46, a plunger magnet 48 connected to the link 47, and a spring locked to the link 46.
There is no 49 and no post 50 to support it, instead it has the configuration shown below.

Behind the second main feed roller 29, arm plates 56 and 57 are provided so as to rotate around a shaft 55 fixed to left and right side frames (not shown) as a fulcrum. Stop the shaft
A paper guide assembly 58 that rotates about a fulcrum 55 is provided.

A third main feed roller 59 and a fifth sub feed roller 60 are provided in front of the paper guide assembly 58, and a shaft 59 of each feed roller is provided.
a and 60a are rotatably supported by the left and right arm plates 56 and 57.

A gear 61 is provided at one end of the shaft 59a. An idle gear 62 meshing with the gear 61 is rotatably supported by an arm plate 57. When the arm plates 56 and 57 rotate around the shaft 55 as a fulcrum, the gear 61 or the idle gear 62 meshes with or separates from the idle gear 64 rotatably locked on the post 63 locked on the side frame. It has become. The idle gear 64 is connected to the second main feed roller 29.
Gear 33 which is locked to the shaft.

A plunger magnet 66 is connected to the arm plate 57 via a link 65.

Further, the rear end of the arm plate 57 is pulled by being locked at one end to a coil spring 68 hung on a side plate via a post 67, and is provided with a plunger magnet.
When 66 is in the released state, the arm plates 56 and 57 and the paper guide assembly 58 are rotated clockwise about the shaft 55 by the coil spring 68. At this time, the gear 61 is engaged with the idle gear 64, and the idle gear 62 is separated from the idle gear 64,
The inlet 58a of the paper guide assembly 58 is connected to the front paper guide 17 and the front paper guide upper.
19 and the sheet traveling path constituted by the line 19.

Also, behind the second main feed roller 29,
The above-mentioned paper chute 26 which branches off from the paper guide assembly 58 and passes below the platen 10 is provided.

Next, the operation of the third embodiment having the above configuration will be described in detail with reference to FIGS.

As shown in FIG. 12, the paper 51 to be printed is inserted between the front paper guide 17 and the front paper guide upper 19,
The motor 41 is driven so that the platen 10 rotates clockwise. At this time, the motor 41 rotates counterclockwise. Thereby, the first and second main feed rollers 18 and 29 also rotate clockwise, and the first main feed roller 18 and the first sub feed roller 20 move the paper 51 between the platen 10 and the print head 15. Print by moving forward.

The paper 51 is further fed to the second main feed roller 29 and the fourth main feed roller 29.
Then, the third main feed roller 59 and the fifth sub feed roller 60 move forward, and as shown in FIG. 13, a sensor 69 having the rear end of the paper 51 attached to the paper guide assembly 58 is provided. The drive of the motor 41 is stopped at the time of passing.

Next, when the plunger magnet 66 is attracted as shown in FIG.
, The gear 61 separates from the idle gear 64, and the idle gear 62 meshes with the idle gear 64. At the same time, the inlet 58 a of the paper guide assembly 58 faces the paper chute 26.

Therefore, when printing on the back side of the paper 51, the motor
When 41 is driven counterclockwise, the platen
10, each gear and each feed roller rotate, the third main feed roller 59 and the fifth sub-feed roller 60 rotate in opposite directions, respectively, and the paper 51 retreats.

When the plunger magnet 66 is released when the leading end of the paper 51 has passed the sensor 69, the platen 10 and each feed roller are rotating as shown in FIG. 16, and the paper 51 is further retracted in that state. Paper 51 is platen
The motor 41 is stopped when the leading end of the paper 51 passes around the sensor 52 and is disposed in front of the second main feed roller 29. At this time, the paper 51 is reversed as shown in the drawing, and the back surface of the paper faces the print head 15 side.

Next, the motor 41 is driven in the opposite direction, that is, clockwise, to print and discharge the paper 51 on the back surface of the paper 51 while retracting the paper 51 between the front paper guide 17 and the front paper guide upper 19.

Next, when printing only on the surface of the paper 51,
When the retraction of the paper 51 is started as described in FIG. 14 and the plunger magnet 38 is released, the paper traveling path switching member 35 approaches the platen 10 as shown in FIG. The paper is discharged between the guide 21 and the paper guide lower 22 for discharge. At this time, by inserting the paper 51 to be printed next between the front paper guide 17 and the front paper guide upper 19, the next printing can be performed while discharging the paper.

Next, a fourth embodiment will be described with reference to cross-sectional views of essential parts in FIGS.

This embodiment is substantially the same as the configuration of the third embodiment, and therefore, only the points different from the third embodiment will be described.

In this embodiment, a second paper guide assembly 70 is further provided above the paper guide assembly 58 of the third embodiment.
Are arranged and supported so as to rotate about the shaft 55.

According to the above configuration, the paper to be printed as shown in FIG.
51 is inserted between the front paper guide 17 and the front paper guide upper 19 to advance and print, and the drive of the motor 41 is stopped when the paper 51 advances and the rear end of the paper 51 passes the sensor 69. I do.

Next, as shown in FIG.
Make 66 suck. At this time, the paper guide assembly
The inlet of 58 faces the paper chute 26 and the inlet of the paper guide assembly 70 is the front paper guide.
17 and the front paper guide upper 19. Then, when the motor 41 is driven in the counterclockwise direction, the paper 51 is retracted, and moves around the platen 10 to move the front paper guide 17.
And return between front paper guide upper 19.

Here, when the sensors 52 and 69 simultaneously output a signal indicating that there is a sheet, the plunger magnet 66 controls the plunger magnet 66 so that the printing is completed and the sheet 51 is discharged until the processing is completed. Becomes Therefore, paper 51
If the length of the paper 51 is long, the plunger magnet 66 is still attracted, so the rear end of the paper 51 enters the paper guide assembly 70, and the motor 41 is turned on when the leading end of the paper 51 passes the sensor 52. Stop.

[Effect of the invention]

According to the present invention described in detail above, there is provided a paper transport unit in which two rollers are pressed against a front side, which is a paper supply side of a printing unit, and a rear side of the printing unit, which include a paper support unit and a print head opposed thereto. In a printer provided with a paper traveling path, a paper stopping member is provided on the paper traveling path behind the printing section to prevent traveling of the paper at a distance shorter than the paper length used in the apparatus from the pressure contact position of the roller, and the printing section Forming a sheet conveying means for returning a sheet, in which another roller has been pressed against a lower roller of the two rollers contacting and forming a rear sheet conveying means at a position lower and lower than the pressing position, to the front, A paper chute is provided below the support portion, and the rear end of the paper chute is arranged so as to follow the paper conveying means for returning the paper to the front, and further, the front end of the paper chute is mounted. By connecting to the paper discharge path provided in the near side, the paper returned by the paper conveying means for returning the paper to the front is discharged to the front through the paper chute and the paper discharge path, so that printing is completed. There is an effect that the operator can take out the sheet from the sheet supply side.

Furthermore, the provision of the transport path along the platen for taking out the printed paper to the paper insertion side has an effect that the mechanism is simple and does not have a large structure.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIGS. 2 to 7 are side views of main parts showing an operation state, FIG. 8 is a perspective view showing a second embodiment, FIG. FIG. 10 is a side view of a main part showing an operation state, FIG. 11 is a perspective view showing a third embodiment, and FIGS.
FIG. 17 is a side view of a main part showing an operation state, FIGS. 18 to 20 are side views of a main part showing an operation state of the fourth embodiment, and FIG.
FIG. 22 is a side view of a first conventional example. 10 ... Platen 11 ... Platen gear 15 ... Print head 17 ... Front paper guide 18 ... First main feed roller 19 ... Front paper guide upper 20 ... First sub feed roller 21 ... Discharge paper Guide 22 Lower discharge paper guide 23 Second sub feed roller 26 Paper chute 27 Third sub feed roller 28 Rear paper guide 29 Second main feed roller 30 Rear paper guide upper 31 Fourth sub-feed roller 32 Fifth sub-feed roller 35 Paper traveling switching member 38 Plunger magnet 41 Motor 44 Paper clamp arm 45 Elastic member 48 …… Plunger magnet 51 …… Paper 52 …… Photo sensor 53 …… Photo sensor 54 …… Bending part 58 …… Paper guide assembly 59 …… Third Infeed roller 60 ...... fifth sub feed roller 69 ...... photosensor 70 ...... paper guide assembly

Claims (1)

(57) [Scope of request for utility model registration] An image forming apparatus comprising: a sheet conveying means having two rollers pressed into contact with a front side, which is a sheet supply side, of a printing section comprising a sheet support section and a print head opposed thereto; A printer provided with a paper stopping member for preventing the paper from traveling at a distance shorter than a paper length used in the apparatus from a pressure contact position of the roller on a paper traveling path behind the printing unit; Forming a sheet conveying means for returning a sheet, which has been brought into contact with a lower roller of the two rollers which are in contact with each other at a position lower and lower than the pressing position, toward the near side, A paper chute is provided, and the rear end of the paper chute is arranged so as to follow the paper conveying means for returning the paper to the near side. By linking the road, the printer being characterized in that so as to discharge forward a paper returned by the sheet conveying means for returning the sheet forward through the paper chute and the paper discharge path.