JPH1149380A - Recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording device equipped with a paper sheet feeding part to admit setting of sheets of paper correctly and capable of feeding sheets stably. SOLUTION: A sheet holding member 43 which presses sheets of paper P loaded on a sheet loading plate 21 to prevent them from levitating is installed in such a way as rotatable to over the plate 21 and energized in the direction of the plate 21, and at the time of sheet feeding, the sheet holding member 43 is separated from the plate 21 against energization by a holding member control means 29, and thereby the back tension at sheet feeding is reduced. At the time of standby about sheet feeding, the sheet holding member 43 is put in the pressing motion by the control means 29 so as to keep the condition that the sheets P are set correctly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording apparatus,
In particular, the present invention relates to a structure of a sheet feeding unit that feeds a sheet to a recording unit.

[0002]

2. Description of the Related Art As a recording device having a function such as a printer, a copying machine, a facsimile, or a recording device used as an output device of a composite electronic device or a workstation including a computer or a word processor, a sheet loading device for loading sheets is known. Some include a sheet feeding unit having a pressure plate which is a plate and a feeding rotating body disposed above the pressure plate.

[0003] When feeding the paper, the feeding unit urges the pressure plate toward the feed rotator by the urging means, and rotates the feed rotator to make a sheet or a plastic thin plate loaded on the pressure plate. The recording material (recording medium) such as is fed to the recording unit. The recording unit is configured to record an image on the recording material from the sheet feeding unit based on the image information.

[0004] By the way, the recording apparatus uses a scanning method.
It can be classified into a serial type in which main scanning is performed in a direction intersecting with the transport direction (sub-scanning direction) of the recording material, and a line type in which recording is performed only by sub-scanning in the transport direction of the recording material.

Here, in a serial type recording apparatus, an image is recorded (main scanning) by recording means mounted on a carriage moving along a recording material, and after a recording of one line is completed, a predetermined amount is recorded. Is carried out (pitch conveyance), and thereafter, the operation of recording (main scanning) the image of the next row on the recording material stopped again is repeated, whereby the entire recording material is recorded. .

On the other hand, in a line type recording apparatus, a recording material is set at a predetermined recording position,
After recording for the line, a predetermined amount of paper feed (pitch feed)
By repeating the operation of collectively recording the next line, the recording of the entire recording material is performed.

[0007] The recording apparatus can be classified into an ink jet type, a wire dot type, a thermal type, a laser beam type and the like according to the recording method. Among such recording apparatuses, an ink-jet recording apparatus (ink-jet recording apparatus) performs recording by discharging ink from a recording unit (recording head) onto a recording material. And a high-definition image can be recorded at a high speed.

Further, recording can be performed on plain paper without requiring special processing, the running cost is low and the non-impact method is used, so that noise is reduced and a color image is recorded using multicolor ink. It has advantages such as easy operation. Above all, a line-type apparatus using a line-type recording means in which a large number of ejection ports are arranged in the paper width direction can further increase the recording speed.

Further, various recording materials can be selected by the above-described features, and since a high-speed recording can be performed with a color image, a long sheet of paper is used for applications such as hanging banner printing. doing.

[0010]

However, in such a conventional recording apparatus, when a long sheet is set in the sheet feeding section, the sheet floats up with the end in the sheet feeding direction of the sheet feeding section as a fulcrum. It is difficult to set the sheet correctly, and when feeding the sheet,
There were problems such as incorrect sheet feeding.

In view of the above, the present invention has been made to solve such a conventional problem, and it is possible to set a sheet correctly and feed the sheet stably. It is an object of the present invention to provide a recording device having a unit.

[0012]

According to the present invention, there is provided a sheet stacking plate for stacking sheets, and a feeding rotating body disposed above the sheet stacking plate. In a recording apparatus having a sheet feeding section for urging a stacking plate toward a feeding rotating body and rotating the feeding rotating body to feed a sheet stacked on the sheet stacking plate to a printing section, A sheet pressing member that is rotatably disposed above the stacking plate, and is urged in a sheet stacking plate direction so as to press sheets stacked on the sheet stacking plate; and And a pressing member control means for separating the sheet pressing plate from the sheet stacking plate against an urging force and pressing the sheet pressing member during a sheet feeding standby state.

Further, according to the present invention, the pressing member control means includes:
It is a cam member having a cam portion for pressing the sheet pressing member and rotating the sheet pressing member in a direction to separate the sheet pressing member from the sheet stacking plate.

Further, according to the present invention, the pressing member control means includes:
It is characterized by having another cam portion for separating the sheet stacking plate from the feeding rotating body against the urging means.

Further, the invention is characterized in that the cam portion and the other cam portion are formed integrally with the pressing member control means.

Further, according to the present invention, the pressing member control means includes:
It is characterized by comprising a cam member having the cam portion and another cam member having the other cam portion.

Further, according to the present invention, the pressing member control means includes:
It is characterized by being an actuator.

Further, according to the present invention, the pressing member control means includes:
It is a manual lever that can be manually operated.

Further, as in the present invention, a sheet holding member for pressing a sheet stacked on the sheet stacking plate to prevent the sheet from floating is attached to the sheet stacking plate so as to be rotatable above the sheet stacking plate and in the direction of the sheet stacking plate. On the other hand, the pressing member control means separates the sheet pressing member from the sheet stacking plate against the urging force at the time of sheet feeding, thereby reducing the back tension at the time of feeding. Further, at the time of feeding standby, the pressing member control means causes the sheet pressing member to perform a pressing operation, thereby maintaining a state in which the sheet is correctly set.

[0020]

Embodiments of the present invention will be described below.

FIG. 1 is a perspective view showing the entire configuration of a recording apparatus according to a first embodiment of the present invention, FIG. 2 is a front view of the recording apparatus, and FIG. 3 is a side sectional view of the recording apparatus. FIG.
In 1 to 3, reference numeral 1 denotes a recording device.
Are a paper feed unit 2, a paper feed unit 3, a paper discharge unit 4, a carriage unit 5,
The cleaning unit 6 is provided.

Next, these components 2, 3, 4, 5, and 6 will be described.

First, the paper feed unit 2 will be described. The sheet feeding unit 2 includes a pressure plate 21 that is a sheet stacking plate on which the sheet material P that is a sheet is stacked, and a feeding rotator 2 that feeds the sheet material P.
2 and a base 20 to which the pressure plate 21 and the feeding rotating body 22 are attached.

The pressure plate 21 is rotatable around a rotation shaft (not shown) connected to the base 20, and is urged by a pressure plate spring 24 toward the feed rotating body 22. A movable side guide 23 is movably provided on the pressure plate 21, and the movable side guide 23 regulates the loading position of the sheet material P. Further, a separation pad 25 made of a material having a large coefficient of friction, such as an artificial skin, for preventing double feeding of the sheet material P is provided on a portion of the pressure plate 21 facing the feeding rotating body 22.

On the other hand, the base 20 covers a corner in one direction of the sheet material P, and separates a separation claw 26 for separating the sheet material P one by one and a separation claw that cannot use the separation claw 26 such as a thick paper. For this reason, a bank 27 integrally formed on the base 20 and a switching lever 28 for switching the separation claw 26 so as to operate in the plain paper position but not in the thick paper position are provided. The sheet feeding operation of the sheet feeding unit 2 will be described later.

Next, the paper feeding section 3 will be described. The paper feed section 3 has a transport roller 36 for transporting the sheet material P and a PE sensor 32. An upper guide for guiding the sheet material P is provided at an entrance of the paper transport section 3 where the sheet material P is transported. 3
3 and a platen 34 are provided. Here, a pinch roller 37 that is driven by the transport roller 36 is provided in contact with the transport roller 36. The pinch roller 37 is held by the pinch roller guide 30 and is pressed against the transport roller 36 by the pinch roller spring 31 to generate a transport force of the sheet material P.

The upper guide 33 has a leading end of the sheet P,
A PE sensor lever 35 for transmitting the trailing edge detection to the PE sensor 32 is provided, and a recording head 7 for forming an image based on image information is provided downstream of the conveyance roller 36 in the sheet material conveyance direction.

In the sheet feeding section 3 having such a configuration, the sheet material P sent from the sheet feeding section 2 to the sheet feeding section 3 includes a platen 34, a pinch roller guide 30, and an upper guide 33.
Roller 36 and pinch roller 37
And sent to the roller pair. At this time, the PE sensor lever 35 detects the leading end of the conveyed sheet material P,
Thus, the printing position of the sheet material P is obtained. Also,
The sheet material P is formed by a roller pair 3 by an LF motor (not shown).
By rotating 6, 37, it is conveyed on the platen 34.

In the present embodiment, the recording head 7 is an easily replaceable ink jet recording head integrally formed with the ink tank. The recording head 7 can apply heat to the ink by a heater or the like. The heat causes the ink to boil,
Ink is ejected from the nozzles 70 of the recording head 7 by a pressure change caused by growth or contraction of bubbles due to the film boiling, and an image is formed on the sheet material P.

Next, the carriage section 5 will be described.
The carriage unit 5 includes a carriage 50 on which the recording head 7 is mounted, and a flexible substrate 51 for transmitting a head signal from the electric substrate 9 to the recording head 7. Here, the carriage 50 has a guide shaft 81 for reciprocating scanning in a direction perpendicular to the conveying direction of the sheet material P,
The carriage 50 is supported by a guide rail 82 that holds the rear end of the carriage 50 and maintains a gap between the recording head 7 and the sheet material P. The guide shaft 81 and the guide rail 82 are attached to the chassis 8.

The carriage 50 is driven via a timing belt 83 by a carriage motor 80 mounted on the chassis 8. The timing belt 83 is stretched and supported by an idle pulley 84.

The carriage unit 5 having such a structure is
When an image is formed on the sheet material P, the roller pair 36, 37 conveys the sheet material P to the line position (position in the conveying direction of the sheet material P) where the image is formed, and the carriage 50 drives the carriage 50 to image the carriage 50. The recording head 7 is moved to a row position (a position perpendicular to the conveying direction of the sheet material P) to be formed so as to face the image forming position. Thereafter, the recording head 7 ejects ink toward the sheet material P in response to a signal from the electric substrate 9 to form an image.

Next, the paper discharge unit 4 will be described. The paper discharge unit 4 includes a transmission roller 40 that contacts the transport roller 36,
A paper discharge roller 41 abutting on the transmission roller 40 and a spur 42 that can rotate following the paper discharge roller 41 are provided.

Thus, the driving force of the transport roller 36 is transmitted to the paper discharge roller 41 via the transmission roller 40, and the spur 42 rotates following the paper discharge roller 41 to form an image on the carriage unit 5. The sheet material P is sandwiched between the nip between the discharge roller 41 and the spur 42, conveyed, and discharged to a discharge tray (not shown).

Next, the cleaning section 6 will be described. The cleaning unit 6 includes a pump 60 for cleaning the recording head 7, a cap 61 for suppressing the drying of the recording head 7, and a drive switching arm 6 for switching the driving force from the transport roller 36 to the paper feeding unit 2 and the pump 60.
2 is comprised.

Here, the drive switching arm 62 is
At times other than sheet feeding and cleaning, a planetary gear (not shown) that rotates about the axis of the transport roller 36 is fixed at a predetermined position, so that the driving force is applied to the sheet feeding unit 2 and the pump 60. Not transmitted.

On the other hand, when the carriage 50 moves, the drive switching arm 62 moves in the direction of arrow A. When the drive switching arm 62 moves in this way, the planetary gears become free, and The planetary gears move according to the forward rotation and the reverse rotation,
The driving force is transmitted to the paper feeding unit 2 when the rotation is normal, and the driving force is transmitted to the pump 60 when the rotation is reverse.

As shown in FIG. 4, a sheet pressing member 43 for pressing the sheet P stacked on the pressure plate 21 to prevent the sheet P from floating is provided on the sheet feeding section 2.
And a control cam member 29 which is a pressing member control means for controlling the pressing operation of the sheet material pressing member 43.

Here, the sheet material pressing member 43 is attached to the main body cover 10 and is urged by an urging spring 44 in a direction of pressing the sheet material P. Note that 43
Reference numerals b and 43c denote sheet material pressing portions provided at the lower end of the sheet material pressing member 43 and pressing the sheet material P.

The control cam member 29 is provided on the base 2 and presses the pressure plate 21 to release the contact between the pressure plate 21 and the feeding rotating body 22. To rotate the sheet material holding member 43.
Cam portion 29b for releasing the pressure contact between the sheet and the sheet P (pressing plate 21).

Here, the second cam portion 29b is constituted by a concave portion formed on the peripheral surface of the control cam member 29. When the sheet material P is set in the sheet material pressing member 43 and before the sheet material is conveyed, the sheet material P enters the second cam portion 29b, and when the sheet material is fed, the second cam portion rotates together with the control cam member 29. With the rotation of 29b, it comes off from the concave portion, and after that, a convex portion 43a is formed which is pressed against the outer peripheral surface of the control cam member 29 to rotate the sheet material pressing member 43. In FIG. 1, reference numeral 10a denotes a cutout opening formed in the main body cover 10 so that the control cam member 29 can rotate.

When the sheet material P is set and before the sheet material P is conveyed, the control cam member 29 controls the first cam portion 29a.
Is in a first position for pushing down the pressure plate 21 to a predetermined position,
By pressing down the pressure plate 21 in this manner, the pressure plate 21
The contact between the feed rotator 22 and the feed rotator 22 is released. When the control cam member 29 is at the first position, the sheet material pressing member 4
The third convex portion 43a enters the second cam portion 29b. As a result, the sheet pressing member 43 is
4 allows the sheet material P (pressing plate 21) to be held in pressure contact with the sheet material P.

On the other hand, when feeding paper, the control cam member 29
4 rotates in the direction of arrow A in FIG. 4 so that the first cam portion 29a is separated from the pressure plate 21 and the second cam portion 29b is disengaged from the convex portion 43a of the sheet material pressing member 43, and is pressed by the outer peripheral surface to form the sheet. The material holding member 43 is moved to a second position in which the material holding member 43 is rotated about the shaft 43d in a direction away from the sheet material P.

The control cam member 29 is located at the second position.
Is moved, the pressure plate 21 rises to a position where the feeding rotator 22 can contact the sheet material P, and when the feeding rotator 22 rotates, the sheet material P is picked up accordingly. Paper feeding is started. Also,
At this time, since the sheet material pressing member 43 rotates in a direction away from the sheet material P, the back tension at the time of feeding is reduced.

Next, the paper feeding operation of the paper feeding unit 2 configured as described above will be described.

FIG. 5 is a view showing a standby state of the sheet feeding section 2. In this standby state, the control cam member 29 is at the first position, and the first cam section 29a pushes down the pressure plate 21 to a predetermined position. I have. Thereby, the contact between the pressure plate 21 and the feeding rotating body 22 is released. The convex portion 43a of the sheet material pressing member 43 is inserted into the second cam portion 29b, so that the sheet material pressing member 43 is set on the sheet material P when the sheet material P is set on the pressure plate 21. If not, it is held in a state of being pressed against the pressure plate 21.

If the sheet material P is not set, the sheet material P is set on the pressure plate 21 in this state, but the sheet material pressing member 43 presses the sheet material P by the urging spring 44. Because it is urged in the direction, even when a sheet material that is difficult to stabilize at the time of setting, for example, a long sheet used for a hanging curtain or a thin paper without a stiffness, the sheet material may rise. It is not set in a bent state.

On the other hand, in this state, the driving force of the transport roller 36 is transmitted to the feed rotator 22 and the control cam member 29 by a gear or the like.
When the first cam portion 2 rotates in the direction
Since 9a is separated from the pressure plate 21, the pressure plate 21 rises to a position where the feeding rotating body 22 can contact the sheet material P. As a result, the sheet material P is picked up with the rotation of the feeding rotating body 22, and the sheet feeding is started.

The direction in which the sheet material pressing member 43 is separated from the sheet material P by being pressed against the outer peripheral surface of the control cam member 29 after its convex portion 43a comes off the second cam portion 29b, FIG. Rotates in the direction of arrow C. Thereby, the back tension at the time of sheet feeding is reduced, and the sheet material P can be stably fed without a sheet feeding failure such as skew of the sheet material P at the time of feeding.

The sheet material P started to be fed by the feeding rotating body 22 is then separated one by one by a separating claw 26 and sent to the sheet feeding unit 3. The feed rotator 22 and the control cam member 29 feed the sheet material P to the sheet feeding unit 3.
Until the sheet P is fed again, and the sheet P and the feed rotator 2
2 is brought into a standby state where the contact with the transport roller 3 is released.
The driving force from 6 is cut off.

When the control cam member 29 returns to the first position where the contact between the sheet material P and the feed rotary member 22 is released, the sheet material pressing member 43 is brought into pressure contact with the sheet material P. To prevent the sheet material P from being lifted or bent.

As described above, by the control cam member 29 pressing the sheet material pressing member 43 at the time of paper feed standby, the state in which the sheet material P is correctly set can be maintained. Further, at the time of paper feeding, the back tension at the time of feeding can be reduced by separating the sheet pressing member 43 from the pressure plate 21 against the urging force.

In the above description, the case where the first cam portion 29a and the second cam portion 29b are provided integrally with the control cam member 29 has been described, but the present embodiment is not limited to this. The control cam member 29 is
It may be constituted by two cam members each having 9a and the second cam portion 29b.

Next, a recording apparatus according to a second embodiment of the present invention will be described. FIG. 6 is a side sectional view of the recording apparatus according to the present embodiment. In the figure, the same reference numerals as those in FIG. 3 indicate the same or corresponding parts.

In the figure, reference numeral 45 denotes a sheet material holding member which is attached to the main body cover 10 and prevents the sheet material P stacked on the pressure plate 21 from being lifted by the biasing spring 44. Reference numeral 46 denotes a solenoid which is an example of an actuator as means for causing the sheet material pressing member 45 to repeatedly contact and separate from the pressure plate. The solenoid 46 is provided on the base 2.

On the other hand, reference numeral 29 'denotes a control cam member. In this embodiment, the control cam member 29' has only the first cam portion 29a. Is not formed.

By the way, as shown in FIG. 7, a projection 45b provided with an opening 45a for slidably holding a pin 46a of a solenoid 46 is formed on the shaft 45d of the sheet material holding member 45. I have. When the solenoid 46 is turned on and the pin 46a moves upward along the opening 45a, the sheet material pressing member 45 is separated from the pressure plate 21 with the shaft 45d as a fulcrum in accordance with the upward movement of the pin 46a. In the figure, it turns in the direction of arrow C.

In the paper feed unit configured as described above, when the control cam member 29 'is at the first position in the standby state, the solenoid 46 is turned off. Thus, the pressure plate 21 is pushed down to a predetermined position by the first cam portion 29a 'of the control cam member 29'.
The sheet pressing member 45 has a solenoid 46 that is an OF.
Since it is F, it is held in a state of contact with the sheet material P (the pressure plate 21).

On the other hand, during conveyance, the control cam member 29 'is rotated in the direction of arrow B to move it to the second position, and the solenoid 46 is turned on. This allows
The pin 46a moves upward along the opening 45a, and accordingly, the sheet pressing member 45 rotates in a direction away from the pressure plate 21 with the shaft 45d as a fulcrum.

With the above-described configuration,
Since there is no need to completely synchronize the timing of the operation of the solenoid 46 with the control cam member 29 'for bringing the pressure plate 21 into and out of contact with the feeding rotary body 22, the independent control is possible.

In the above description, the case where the control cam members 29 and 29 'and the solenoid 46 are used as means for repeating the contact and separation of the sheet material pressing member 45 with the pressure plate has been described. The present invention is not limited to this, and may be a manual lever that can be manually operated.

[0062]

As described above, according to the present invention,
By pressing the sheet loaded on the sheet stacking plate by the sheet pressing member at the time of sheet feeding standby, a sheet that is difficult to stabilize, for example, a long sheet used for a banner, a thin sheet of paper without rigidity, etc. is set. Even in this case, it is possible to prevent the sheet from being lifted or set in a bent state, thereby avoiding skewing or jamming of the sheet.

Further, at the time of sheet feeding, the back tension can be reduced by separating the sheet pressing member from the pressure plate against the urging force, and there is no sheet feeding failure such as skew of the sheet during feeding. Thus, stable sheet feeding can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a recording apparatus according to a first embodiment of the present invention.

FIG. 2 is a front view of the recording apparatus.

FIG. 3 is a side sectional view of the recording apparatus.

FIG. 4 is a perspective view of a sheet feeding unit of the recording apparatus as viewed from a sheet feeding side.

FIG. 5 is a diagram illustrating a standby state of the paper feeding unit.

FIG. 6 is a side sectional view of a recording apparatus according to a second embodiment of the present invention.

FIG. 7 is a diagram illustrating a standby state of a sheet feeding unit of the recording apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 recording device 2 paper feed unit 3 paper feed unit 21 pressure plate 22 feed rotating body 24 pressure plate spring 29, 29 'control cam member 29a first cam portion of control cam member 29b second cam portion of control cam member 43, 45 sheet Material holding member 43a Convex portion of sheet material holding member 44 Urging spring 46 Solenoid P Sheet material

Claims (7)

[Claims] 1. A sheet stacking plate for stacking sheets, and a feeding rotator disposed above the sheet stacking plate, wherein the sheet stacking plate is biased toward the feeding rotator by a biasing means during sheet feeding. A recording device having a sheet feeding unit for feeding a sheet stacked on the sheet stacking plate to the recording unit by energizing and rotating the feeding rotating body, wherein the sheet rotating unit is rotatable above the sheet stacking plate; Along with
A sheet holding member urged in the sheet stacking plate direction to press the sheet stacked on the sheet stacking plate, and at the time of feeding, the sheet holding member is separated from the sheet stacking plate against an urging force; And a pressing member control means for causing the sheet pressing member to perform a pressing operation when the sheet is on standby. 2. The apparatus according to claim 1, wherein said pressing member control means is a cam member having a cam portion for pressing said sheet pressing member and rotating said sheet pressing member in a direction to separate said sheet pressing member from a sheet stacking plate. Item 2. The recording device according to Item 1. 3. The pressing member control means has another cam portion for separating the sheet stacking plate from a feeding rotary member against the urging means. Recording device. 4. The recording apparatus according to claim 2, wherein said cam portion and another cam portion are formed integrally with said holding member control means. 5. A recording apparatus according to claim 2, wherein said pressing member control means comprises a cam member having said cam portion and another cam member having said another cam portion. . 6. The recording apparatus according to claim 1, wherein said pressing member control means is an actuator. 7. The recording apparatus according to claim 1, wherein said pressing member control means is a manual lever which can be manually operated.