JPH0958898A - Sheet conveying device and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress sagging, generated at the time of conveying a continuous sheet, to a minimum so as to prevent the dislocation of a recorded image caused by sagging by changing a space between a guide means and a conveying means interlockingly with the switching action of a switching means. SOLUTION: When a release lever is set into a continuous sheet selecting position, a gear part of a release shaft 33 fitted to a gear part of the release lever is rotated. A protrusion 33b thereby presses a roller holder 8, and a register roller 6 is spaced from a carrier roller 5 and retreated from a sheet conveying path. A protrusion 33c pushes up a roller opposed part 10a of a paper pan 10, and a space between the paper pan 10 and the carrier roller 5 is narrowed to L/2 from L. At the time of selecting cutform sheets, a space between the paper pan 10 and the carrier roller 5 is set to L. This is because load applied to sheets at the time of conveying relatively thick sheets such as envelopes and postcards is increased if the space is narrowed in the same way as the time of selecting a continuous sheet and there is a risk of generating conveying failure or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus capable of selectively conveying single sheets such as postcards, envelopes and cut sheets, or continuous sheets such as fanfold sheets. The present invention relates to a sheet conveying device configured to perform optimum sheet conveyance.

[0002]

2. Description of the Related Art Conventionally, a recording device such as a printer used as an output device of a computer or the like can use a single-cut sheet such as a postcard, an envelope or a cut sheet and a continuous sheet such as a fanfold sheet. Yes, each sheet can be selectively conveyed. In such an apparatus, the conveyance of each sheet is given a conveying force by the rotation itself of the conveyance roller in the case of the single-cut sheet, and is arranged on the upstream side of the conveyance roller in the case of the continuous sheet. This is done by applying a conveying force with a push tractor.

For example, as shown in FIG. 15, the apparatus disclosed in Japanese Laid-Open Patent Publication No. 2-70478 is arranged below the conveying roller 501 in order to more effectively convey the sheets according to the respective sheets. Roller holders 504 having rollers 502 and 503 are arranged on the side close to the recording head 500 and the side distant from the recording head 500, respectively. Then, as shown in FIG. 15 (a), the roller holder 504 is in a state in which the rollers 502, 503 are in pressure contact with the conveying roller 501, and the recording head 50 is shown in FIG. 15 (b).
The roller 502 on the side closer to 0 can be brought into contact with and separated from the carrying roller 501 so that the roller 502 can be brought into contact with the carrying roller 501.

When the cut sheet S1 is conveyed by the above apparatus, as shown in FIG. 15A, the sheet S1 is pressed against the conveying roller 501 by the rollers 502 and 503, and the conveying roller 501 is pressed. The rotation ensures reliable transport. Further, when the continuous sheet S2 is conveyed by the pusher tractor 505, as shown in FIG. 15B, the sheet S2 is lightly pressed against the conveying roller 501 only by the roller 502 near the recording head 500 by the lever operation. As a result, the slack of the sheet in the recording area is eliminated, and accurate recording becomes possible. Further, as shown in FIG. 15 (c), the push tractor 50
When the continuous sheet S2 is conveyed by both the 5 and the pull tractor 506, the conveyance roller is operated by operating the lever described above.
Release the pressure contact of both rollers 502, 503 against 501,
Accurate recording is possible.

[0005]

However, in the above conventional example, as shown in FIG. 15B, when the continuous sheet is conveyed, the sheet between the roller 502 near the recording head 500 and the push tractor 505 is conveyed. The slack of the sheet occurs in the transport path. Normally, the transport speed of the transport roller 501 is slightly higher than that of the push tractor 505, so that the slack of the sheet is gradually absorbed by the rotation of the transport roller 501. There was an inconvenience that there was a deviation.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to minimize the slack during conveyance of a continuous sheet and prevent the deviation of the recorded image due to the slack. Especially.

[0007]

The structure of a typical sheet conveying apparatus of the present invention for achieving the above object is a sheet conveying apparatus capable of selectively conveying a single-cut sheet or a continuous sheet, Transporting means for transporting the sheet, contact means for pressing the sheet against the transporting means, pressure contact force applying means for applying a pressure contact force for pressing the sheet against the transporting means to the contacting means, and the transporting means Switching means for pressing and releasing the contact means,
A guide unit that faces the conveying unit at a predetermined interval and guides the sheet along the conveying unit,
It is characterized in that the interval between the guide means and the transport means changes in association with the switching operation of the switching means.

Further, the structure of a typical recording apparatus of the present invention for achieving the above-mentioned object includes a sheet conveying apparatus having the above-mentioned structure, and a platen for supporting the sheet in a recording area where recording is performed on the sheet. , And mounting means for removably mounting the recording means facing the platen.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] Hereinafter, an embodiment of a recording apparatus including a sheet conveying apparatus to which the present invention is applied will be described in detail with reference to the drawings. In this embodiment, a serial type ink jet recording apparatus is exemplified as the recording apparatus. FIG. 1 is a side sectional view showing a schematic configuration of an inkjet recording apparatus equipped with an automatic feeding apparatus (hereinafter referred to as “ASF”), and FIG. 2 is an upper surface of the inkjet recording apparatus with the automatic feeding apparatus removed. It is a figure.

The ink jet recording apparatus of this embodiment is
As recording media, ordinary recording paper, single-cut sheets such as envelopes and postcards, and continuous sheets such as fanfold paper can be selectively used.

First, when using a single-cut sheet, the sheet is usually fed by using ASF or so-called manual feeding. As shown in FIG. 1, the ASF consists of two bins 1a and 1b. For example, cut sheets of different sizes (for example, A4 size and B5 size) are set at the same time. The configuration is such that it can be used according to the user's selection operation. The sheet feeding mechanism of each of the bins 1a and 1b has the same mechanism. That is, the plurality of single-cut sheets stacked on the pressing plates 2a and 2b (the single-cut sheets are not shown in FIG. 1) are pressed against the pickup rollers 4a and 4b by the pressing force of the springs 3a and 3b. The pickup rollers 4a and 4b, which are urged to rotate, in response to a feeding start command, feed the sheets while separating them one by one.

The cut sheet fed from the ASF as described above is pressed against the conveying roller 5 as the conveying means by the registration roller 6 as the abutting means, and is formed around it by the rotation of the conveying roller 5. The recording medium is conveyed to the recording area through the conveyed conveyance path. Here, the registration roller 6 that presses the sheet against the transport roller 5 is a roller holder 8 that is biased by the biasing force of the coil spring 7.
It is rotatably supported on the carriage roller 5 and is configured to be able to come into contact with and separate from the conveying roller 5 by operating a release lever 9 shown in FIGS. When the cut sheet is used as described above, the registration roller 6 is in contact with the conveyance roller 5 by the operation of the release lever 9. Further, in the present invention, the interval of the sheet conveying path formed by the conveying roller 5 and the roller facing portion 10a of the paper pan 10 as a guide means that faces the peripheral surface of the roller 5 and guides the sheet, It is configured to change in association with the operation of the release lever 9. This configuration will be described later in detail.

An auxiliary roller 11 functioning as an abutting means is pressed against the conveying roller 5 on the downstream side of the registration roller 6 in the sheet conveying direction. The auxiliary roller 11 is supported by a roller holder 8 having the registration roller 6 rotatably so as to be vertically movable, and is pressed against the conveying roller 5 by the urging force of a coil spring 12 attached to the roller holder 8. ing. In front of the recording area on the further downstream side, a pinch roller 13 functioning as an abutting unit.
The pinch roller holder 14 which is rotatably provided is biased by the elastic force of the leaf spring 15, and the pinch roller 13 is pressed against the transport roller 5. Therefore, a conveying force is further applied to the single-cut sheet at the nip portion between the auxiliary roller 11 and the pinch roller 13 and the conveying roller 5, and the sheet is conveyed between the inkjet head 16j as a recording unit and the platen 17. . The sheet is conveyed in this recording area intermittently for each scanning of the inkjet head 16j, and the amount of the conveyance corresponds to the arrangement length of the plurality of ink ejection ports provided in the inkjet head 16j in the sheet conveying direction. Is set.

The ink jet head 16j is of a cartridge type in which an ink tank 16t is integrated, and is detachably mounted on a carriage 18 as a mounting means. The carriage 18 is slidably supported by a guide shaft 19 and a guide rail 20, and pulleys 21 and 22 are provided near both ends of the guide shaft 19.
It is connected to an endless belt-shaped timing belt 23 that is bridged in between. Therefore, by driving the pulley 21 by the carriage motor 24, the carriage 18 reciprocates in the direction orthogonal to the sheet conveying direction. During this movement, the inkjet head 16j ejects ink according to an image signal, so that an image is recorded on the sheet whose back surface is supported by the platen 17.

The principle of ink ejection of the ink jet head 16j used in the present embodiment is generally a fine liquid ejection port (orifice), a liquid passage, an energy acting portion provided in a part of this liquid passage, and the acting portion. It is provided with an energy generating means or the like for generating droplet forming energy that acts on the liquid.

As an energy generating means for generating such energy, a recording method using an electromechanical transducer such as a piezo element, electromagnetic waves such as a laser are radiated to generate heat, and droplets are ejected by the action of the heat generation. There are a recording method using an energy generating means, a recording method using an energy generating means that heats a liquid by an electrothermal converter such as a heating element having a heating resistor, and ejects the liquid.

Among them, an ink jet head used in an ink jet recording method for ejecting a liquid by heat energy has a high density of liquid ejection ports (orifices) for ejecting recording liquid droplets to form ejection liquid droplets. Since they can be arranged, high resolution recording is possible. Among them, the inkjet head using the electrothermal converter as the energy generating means is easy to be made compact, and has the advantages of the IC technology and the microfabrication technology, which have been remarkably improved in technology and reliability in the recent semiconductor field. It can be used in two parts, and high-density mounting is easy,
The manufacturing cost is also low, which is advantageous.

The ink jet head 16j of this embodiment is
With more than 64 nozzles, the pressure of film boiling generated in the ink by the selective heat generation of the electrothermal conversion element provided in this nozzle ejects the ink from the ejection port at the tip of the nozzle It forms an image.

The carriage 18 is at the home position (left end of the moving area in FIG. 2) in the recording standby state, and the ink jet head 16j is made to stand by at the home position. The capping unit 25 of the inkjet head 16j is provided at this position to prevent the nozzles of the inkjet head 16j located at the home position from drying.

As described above, the single-cut sheet recorded by the intermittent conveyance of the ink jet head 16j for each scanning and the ink ejection from the ink jet head 16j during that period is the assist roller 26 and the discharge roller 27.
Is rotated and the spurs 26a and 27a pressed by these are sequentially conveyed to above the apparatus and discharged.

When a continuous sheet is used, the AS
F is not used, and the continuous sheet is inserted through the insertion port 28. The continuous sheet inserted through the insertion port 28 is conveyed to the recording area by driving the pin tractor 29. At this time, the registration roller 6 is connected to the release lever 9 described above.
Due to this, the contact with the transport roller 5 is released, and it is in a separated state (see FIG. 8). Then, the continuous sheet conveyed to the recording area (between the inkjet head 20j and the platen 24) is the same as in the case of the single-cut sheet described above.
The inkjet head 16j is sequentially conveyed to the upper part of the apparatus by intermittent conveyance for each scanning, and recording is performed at the same time.
After the recording, the assist roller 26 and the discharge roller 27 are rotated, and the spurs 26a and 27a pressed against the discharge roller 27 discharge the recording medium to the upper side of the apparatus.

The ASF motor 30 (see FIG. 2) provided on the home position side of the main body of the apparatus is the above-mentioned A
It is used to drive the SF pickup rollers 4a and 4b and to drive the absorption pump in the capping unit 25. Further, the driving force required for sheet conveyance such as driving of the conveyance roller 5 is generated from the LF motor 31 provided on the opposite side of the home position to the gear train 32 (see FIGS. 6 and 9).
Is transmitted to each drive roller via.

Next, the structure of the control system of the ink jet recording apparatus will be described with reference to FIG. In FIG.
The control board 100 is in the form of a printed circuit board and is provided at the bottom of the apparatus body (see FIG. 1). The control board 100 includes an MPU 101 and a gate array (GA) 102.
, Dynamic RAM (DRAM) 103 and mask R
An OM (MASK ROM) 107 is provided. Further, a drive circuit for each motor, that is, a CR motor driver (carriage motor driver) 104, an LF motor driver 105
, And an ASF motor driver 106 are also provided.

The control board 100 is a Centronics interface (I / F) board in the form of a printed circuit board.
108 is connected so that the recording data and the like can be received from a device such as a host computer.

In the control board 100, the MPU 101 executes data processing for the entire apparatus. The MASK ROM 107 stores the data processing procedure and the like, and the DRAM 103 is used as a work area for the data processing. The gate array 102 has the MP
Various circuits related to U101 data processing are formed.

Therefore, the MPU 101 converts the image data transferred from the device such as the host computer via the I / F 108 into the ejection data used in the ink jet head 16j, and the data is converted according to the ejection timing in the ink jet head 16j. Inkjet head
Transfer to 16j driver. In addition, the MP
U101 drives the corresponding motors 24, 31, 30 via the drivers 104, 105, 106, respectively. In particular, the drive control of the CR motor 24 is performed together with the ejection timing control based on the information of the linear encoder 109 obtained via the carriage 18.

In addition, the MPU 101 performs processing related to key input and information display on the front panel 110, home position (HP) sensor 111, and tractor detection (R).
RL) sensor 112, sheet detection (PE) sensor 113, and paper type determination sensor 114 execute processing according to the detection information.

Next, the structure of the drive system of the above apparatus (hereinafter referred to as the LF drive system) and the state when the single-cut sheets and continuous sheets are selectively conveyed will be described.

First, the case where a single-cut sheet is selected will be described with reference to FIGS. As shown in FIG. 4, when the release lever 9 is set to the single-cut sheet selection position, the registration roller 6 held by the roller holder 8 is pressed against the long conveying roller 5 by the urging force of the coil spring 7 ( (See FIG. 5). At the same time, the pinch roller 13 held by the roller holder 14 is pressed against the conveying roller 5 by the urging force of the leaf spring 15 (see FIG. 5). At this time, the leaf spring 15 is
It is pushed by the projection 33c of the release shaft 33 and is bent around the fulcrum 15a, and the urging force is generated by the spring elastic force centering on the fulcrum 15a. The release shaft 33
As shown in FIG. 10, the positional relationship between the two protrusions 33b and 33c provided on the peripheral surface of the is arranged so as not to interfere with each other in the axial direction.

Further, when the release lever 9 is set to the single-cut sheet selection position, the paper pan is
The roller facing portion 10a of the roller 10 faces the transport roller 5 with a predetermined space (L in FIG. 12B).

As described above, in the state where the release lever 9 is set to the single-cut sheet selection position as shown in FIG. 4, the driving force of the LF motor 31 is set to the conveying roller 5 and the discharging roller.
It is transmitted in two directions of 27 (see FIG. 6). The transmission of the driving force to the conveying roller 5 is transmitted to the conveying roller gear 37 which is press-fitted to the shaft end portion of the conveying roller 5 via the gear train of the LF motor gear 34, the reduction gear 35, and the LF reduction gear 36. The transport roller 5 rotates in the sheet transport direction. On the other hand, regarding the transmission of the driving force to the discharge roller 27, the LF
It is transmitted to the discharge roller gear 39 fitted to the shaft end portion of the discharge roller 27 via the gear train of the motor gear 34, the reduction gear 35, and the LF reduction gear 38, and the discharge roller 27 rotates in the sheet conveying direction.

In this embodiment, since the conveying roller 5 is formed to be long in the main scanning direction (direction orthogonal to the sheet conveying direction), a large size sheet (for example, B4 size or A3 size) is used. Etc.), it is possible to surely eliminate the deflection.

Further, in this embodiment, the rotation speed of the discharge roller 27 is set to be higher than the rotation speed of the transport roller 5, so that the flatness of the sheet at the recording position is ensured.
Specifically, the diameter of the conveying roller 5 is φ38.808 (0, −0.
06), the diameter of the discharge roller 27 is φ15.515 (± 0.03), the reduction ratio of the conveying roller 5 is 1/36, and the reduction ratio of the discharge roller 27 is 1/15. Taking into account 0.80% to 1.19%).

By the way, regarding the transmission of the driving force to the pin tractor 29, the LF motor gear 34, the reduction gear 35 and the L gear
Transmission is made up to the F reduction gear 36, but transmission from the LF reduction gear 36 to the clutch gear 40 is cut off. That is, the clutch gear 40 is urged to the frame 44 side (direction connected to the LF reduction gear 36) by the clutch spring 41 shown in FIG. 6B, but the cam 42b of the slide cam 42 that interlocks with the release lever 9 is urged. L against the biasing force of the spring 41
It is separated from the F reduction gear 36. Therefore, the tractor gear fitted to the end of the tractor shaft 29a of the pin tractor 29 is
It is not transmitted to 43, and the pin tractor 29 does not rotate and is in a stopped state.

Next, the case where the continuous sheet is selected will be described with reference to FIGS. As shown in FIG. 7, when the release lever 9 is set to the continuous sheet selection position,
A release shaft fitted with the gear portion 9a of the release lever 9
The gear portion 33a of 33 rotates in the direction of arrow A. By this rotation of the release shaft 33, the protrusion 33b presses the roller holder 8 as shown in FIG. 8, the registration roller 6 is separated from the conveyance roller 5, and is retracted from the sheet conveyance path. At this time,
Similarly, the auxiliary roller 11 held on the rotation fulcrum 8a side of the roller holder 8 also tries to move in the direction away from the transport roller 5, but to the extent that the coil spring 12 weakens the biasing force on the transport roller 5. It has been stopped.

Further, the rotation of the release shaft 33 releases the pressing of the projection 33c against the leaf spring 15, and the pressure contact force of the pinch roller 13 against the conveying roller 5 is relieved. At the same time, when the distance between the sheet conveying paths formed by the paper pan 10 and the conveying rollers 5 is L1 when the single-cut sheet is selected and L2 when the continuous sheet is selected, the relationship between the two is expressed. It changes so that L1> L2. That is, the rotation of the release shaft 33 causes the protrusion 33c.
Pushes up the roller facing portion 10a of the paper pan 10 and narrows the distance between the paper pan 10 and the transport roller 5 from L to L / 2 (see FIG. 12A). Here, the distance between the paper pan 10 and the conveying roller 5 is L when the single-cut sheet is selected. If the distance is narrowed in the same manner as when the continuous sheet is selected, a relatively thick sheet such as an envelope or a postcard is conveyed. This is because the load applied to the sheet sometimes increases, which may cause conveyance failure or the like.

Therefore, when the release lever 9 is set to the continuous sheet selection position, only the registration roller 6 is separated from the conveying roller 5, and the auxiliary roller 11 and the pinch roller 13 are pressed against the conveying roller 5 with a light force. . At the same time, the roller facing portion 10a of the paper pan 10 facing the transport roller 5 with a gap L is pushed up, and the gap between the two is narrowed from L to L / 2 (see FIG. 12).

LF when selecting the continuous sheet
The driving force of the motor 28 is transmitted in three directions of the transport roller 5, the discharge roller 27, and the pin tractor 29. Here, the driving force transmission to the transport roller 5 and the discharge roller 27 is the same as that at the time of selecting the single-cut sheet described above, and thus the description thereof is omitted here.

Regarding the transmission of the driving force to the pin tractor 29, the LF motor gear 34, the reduction gear 35, and the LF reduction gear are used.
Tractor shaft 29a through the gear train of 36 and clutch gear 40
Is transmitted to the tractor gear 43 fitted to the end of the tractor, the tractor shaft 29a is rotated, and the driving force is transmitted to the pin tractor 29 (see FIG. 9B). That is, although the clutch gear 40 is biased toward the frame 44 by the clutch spring 41,
Cam 42c of slide cam 42 when continuous seat is selected
Thus, the clutch gear 40 is connected to the LF reduction gear 36 and the tractor gear 43. At the same time, as shown in FIG. 7, the side surface portion of the slide cam 42 acts on the tractor detection sensor 45,
Electrically, the sheet selection mode is switched from single-cut sheets to continuous sheets.

Next, in the continuous sheet selection state,
Pinch roller 13 and auxiliary roller 11 for the conveyance roller 5
The reason why the pressure contact force is weakly contacted and the reason why the distance between the transport roller 5 and the paper pan 10 is narrowed will be described.

Pinch roller 13 for the transport roller 5
The reason why the pressure contacting force of the sheet is weakly contacted is that the conveyance accuracy of the continuous sheet is usually controlled by the pin tractor 29. However, if the pressure contacting force of the pinch roller 13 is set to "0", the sheet joint (perforation) is ), The pinch roller 13 may be separated from the surface of the transport roller 5. In this apparatus, in order to prevent this, the pinch roller 13 is pressed against the conveying roller 5 with an appropriate pressing force. In the present embodiment, the pressure contact force of the pinch roller 13 against the conveying roller 5 is set to 1200 g when the single-cut sheet is selected and up to 200 g when the continuous sheet is selected.

On the other hand, the reason why the pressing force of the auxiliary roller 11 against the conveying roller 5 is weakly pressed is to reduce the error in the sheet detecting position by the sheet detecting sensor 113 arranged in the vicinity of the auxiliary roller 11. is there. That is, the sheet conveyed by the conveying roller 5 has its weight (basis weight,
When the paper is wound around the conveyance roller 5 and conveyed due to a difference in waist due to a difference in type (for example, a sheet having a weak waist), a roller facing portion of the paper pan 10
There is a case where the sheet is conveyed along 10a (a sheet having a strong stiffness). Here, if the pressure contact force of the auxiliary roller 11 is "0", the auxiliary roller 11 may be pressed depending on the weight of the sheet or the strength of the waist.
11 is separated from the peripheral surface of the transport roller 5. If the distance between the conveying roller 5 and the roller facing portion 10a of the paper pan 10 at this time is L, the error in the position detected by the sheet detection sensor 113 is 2L at maximum. In order to reduce this error, in this apparatus, when the detection position of the flag 113b of the sheet detection sensor 113 is P and the contact point between the auxiliary roller 11 and the conveyance roller 5 is Q, the position P is the contact point Q. Auxiliary roller so that it is always on the downstream side in the sheet conveying direction.
There are 11 positions. That is, the auxiliary roller 11 is pressed against the conveying roller 5 with an appropriate pressing force. This allows
The sheet conveyed near the sheet detection sensor 37 is
Since the sheet is always conveyed while being wound around the conveying roller 5, the above-mentioned detection error can be reduced.
In this embodiment, the transport roller 5 of the auxiliary roller 11 is used.
Pressing force against the sheet is 75g when single sheet is selected and up to 20g when continuous sheet is selected.

Further, the distance between the transport roller 5 and the roller facing portion 10a of the paper pan 10 when the continuous sheet is selected is made narrower than that when the single-cut sheet is selected, because the slack of the sheet passing therethrough is minimized. This is to make it smaller.
In this embodiment, as shown in FIGS. 12 (a) and 12 (b), the interval is set to L (= 1.5 mm) when a single-cut sheet is selected.
And when selecting continuous sheets, the narrowest part is L / 2
It is changed so that (= 0.75 mm). By narrowing the interval when selecting the continuous sheet in this way, the slack of the sheet between the pinch roller 13 and the auxiliary roller 11 is reduced, and therefore, the slack of the sheet is gradually absorbed so that a recording image is generated. The gap can be minimized.

[Second Embodiment] Next, a second embodiment of a recording apparatus including a sheet conveying apparatus to which the present invention is applied will be described with reference to FIG. FIG. 13 is an enlarged side cross-sectional view of a main part of the recording apparatus according to the second embodiment, FIG. 13 (a) shows a case of continuous sheet selection, and FIG. 13 (b) shows a case of single-cut sheet selection. This is the case. Since the configuration of the entire apparatus is substantially the same as that of the above-described embodiment, only the characteristic portion will be described in this embodiment. The same components as those of the above-described embodiment are designated by the same reference numerals, and the description of those components is omitted. The features of this embodiment will be described below.

In this embodiment, the release shaft 33, which rotates in association with the switching operation of the release lever 9, has a projection 33d having a sheet guide surface 33e, and the projection 33d is changed by the switching operation of the release lever 9. It is configured so as to enter and retreat into a sheet conveying path formed by the conveying roller 5 and the paper pan 10 through a hole 10b provided in the roller facing portion 10a. That is, when a single sheet is selected, the sheet is retracted from the sheet conveying path as shown in FIG. 13B, and when continuous sheets are selected, the sheet enters the sheet conveying path as shown in FIG. Roller 5
And the space between the paper pan 10 and the paper pan 10 are changed. Also in the present embodiment, the relationship between the two is L1> L2 when the interval when selecting the single-cut sheet is L1 and the interval when selecting the continuous sheet is L2.

According to the above construction, the distance between the paper pan 10 and the conveying roller 5 cannot be narrowed as a whole as compared with the above-mentioned embodiment, so that the slackening effect at the time of selecting continuous sheets is small, but the mechanism is It has the advantage of being simple.

[Third Embodiment] Next, a third embodiment of a recording apparatus including a sheet conveying apparatus to which the present invention is applied will be described with reference to FIG. 14A and 14B are enlarged side cross-sectional views of the main part of the recording apparatus according to the third embodiment. FIG. 14A shows the case of continuous sheet selection, and FIG. 14B shows the case of single-cut sheet selection. This is the case. Since the configuration of the entire apparatus is substantially the same as that of the above-described embodiment, only the characteristic portion will be described in this embodiment. The same components as those of the above-described embodiment are designated by the same reference numerals, and the description of those components is omitted. The features of this embodiment will be described below.

In this embodiment, a hole 10c is provided in the roller facing portion 10a of the paper pan 10, and a moving guide 10e having a projection 10d that fits in and out of the hole 10c is provided to release the projection 10d. The moving guide 10e, which is a part of the paper pan 10, is configured to approach / separate from the conveying roller 5 by pushing up / releasing the protrusion 33c of the shaft 33. That is, when a single-cut sheet is selected, it is in a state of being retracted from the peripheral surface of the conveying roller 5 as shown in FIG. 14B, and when continuous sheets are selected, as shown in FIG. The distance between the transport roller 5 and the paper pan 10 is changed in the vicinity of the position. Also in the present embodiment, the relationship between the two is L1> L2 when the interval when selecting the single-cut sheet is L1 and the interval when selecting the continuous sheet is L2.

According to the above construction, although the number of parts is increased as compared with the above-mentioned embodiment, the distance between the both can be more accurately reduced, and the slackening can be performed more accurately when continuous sheets are selected. Therefore, it is possible to minimize the deviation of the recorded image due to the slack.

[Other Embodiments] In the above-described embodiment, an ink jet recording type recording apparatus is exemplified as the recording apparatus including the sheet conveying apparatus to which the present invention is applied.
The present invention is not limited to this, and may be applied to, for example, a recording apparatus of a thermal transfer recording system, a thermal recording system, a wire dot recording system, or another recording system. Further, it is not necessary to limit to the serial recording method, and a so-called line recording method may be used. Further, in addition to the one used as the image output terminal of the information processing equipment such as the computer described above, a copying machine combined with a reader or the like, or a facsimile machine having a transmission / reception function may be used.

Further, in the above-described embodiment, as the recording means, the one in which the ink jet head and the ink tank for supplying the ink to the ink jet head are integrally formed and mounted on the head mounting portion is exemplified. For example, the inkjet head and the ink tank are separate bodies, and the inkjet head has an ink tank holder for mounting the ink tank and is mounted to the head mounting portion, or an ink tank It may be a form in which only the inkjet head is mounted on the head mounting portion in preparation for the recording apparatus main body side.

The ink jet head mounted on the above-mentioned head mounting portion is reciprocated in a direction intersecting the transporting direction of the recording medium mounted on the carriage as the head mounting portion and arranged in the recording area to move one to several lines. In addition to the so-called serial type inkjet head that performs line recording, a so-called full-line type inkjet head in which ink ejection ports are arranged over the entire width of the recording medium in the direction intersecting the transport direction of the recording medium arranged in the recording area It includes.

Further, the above-mentioned recording means is provided with an ink jet head capable of ejecting some or all of black ink liquid, yellow ink liquid, magenta ink liquid, cyan ink liquid, or pretreatment liquid. May be Further, the above-mentioned inkjet head further comprises an electrothermal converter arranged in a liquid path communicating with the ink ejection port, and ejects ink or the like from the ink ejection port by using thermal energy generated by the electrothermal conversion element, A piezoelectric element may be arranged in the liquid path, and ink or the like may be ejected from the ink ejection port by using vibration or volume change of the piezoelectric element.

[0054]

As described above, according to the present invention,
Since the distance between the conveying means for conveying the sheet and the guide means that faces the conveying means at a predetermined distance and guides the sheet along the conveying means can be changed by the operation of the switching means, When selecting single-cut sheets including thick sheets such as envelopes and postcards, the interval can be set to the normal state for stable sheet conveyance, and when selecting continuous sheets such as fanfold paper, the interval is narrowed to reduce the interval. The slack can be minimized. Therefore, it is possible to prevent the deviation of the recorded image due to the slack of the sheet.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a schematic configuration of a recording apparatus (when an automatic feeding apparatus is mounted) including a sheet conveying apparatus to which the present invention is applied.

FIG. 2 is a top view of the apparatus with the automatic feeder removed from the apparatus body shown in FIG.

FIG. 3 is a block diagram showing a configuration of a control system of the recording apparatus.

FIG. 4 is a side view showing a state when a single-cut sheet is selected by a drive system of a sheet conveying device in the recording apparatus.

FIG. 5 is a structural cross-sectional view of a main part of a sheet conveying device (when a single-cut sheet is selected) in the recording device.

FIG. 6 is a development view showing a state in which a single sheet is selected by a drive system of a sheet conveying device in the recording apparatus.

FIG. 7 is a side view showing a state when a continuous sheet is selected by the drive system of the sheet conveying device in the recording apparatus.

FIG. 8 is a structural cross-sectional view of a main part of a sheet conveying device (when continuous sheets are selected) in the recording device.

FIG. 9 is a development view showing a state in which continuous sheets are selected by a drive system of a sheet conveying device in the recording apparatus.

10 is a top view showing the cam structure of the release shaft shown in FIGS. 5 and 8. FIG.

FIG. 11 is a cross-sectional view of an essential part for explaining a positional relationship between an auxiliary roller and a sheet detection sensor with respect to a conveyance roller.

FIG. 12 is a side cross-sectional view showing a state of a gap between a transport roller and a paper pan when a release lever is operated,
(A) shows the case of continuous sheet selection, and (b) shows the case of single-cut sheet selection.

FIG. 13 is a side cross-sectional view showing a state of a gap between a conveyance roller and a paper pan when a release lever of a device according to a second embodiment is operated, where (a) is for continuous sheet selection, and (b) is for (b). This is the case when a single-cut sheet is selected.

FIG. 14 is a side cross-sectional view showing a state of a gap between a conveyance roller and a paper pan when a release lever of a device according to a third embodiment is operated, where (a) is for continuous sheet selection and (b) is for (b). This is the case when a single-cut sheet is selected.

15A and 15B are explanatory views of a conventional technique, where FIG. 15A is a case of a single-cut sheet, and FIGS. 15B and 15C are cases of a continuous sheet.

[Explanation of symbols]

1a, 1b ... Bottle 2a, 2b ... Pressing plate 3a, 3b ... Spring 4a, 4b ... Pickup roller 5 ... Conveying roller 6 ... Registration roller 7, 12 ... Coil spring 8, 14 ... Roller holder 8a ... Rotation fulcrum 9 ... Release Lever 9a ... Gear part 10 ... Paper pan 10a ... Roller facing parts 10b, 10c ... Hole 10d ... Protrusion 10e ... Movement guide 11 ... Auxiliary roller 13 ... Pinch roller 15 ... Leaf spring 15a ... Support point 16j ... Inkjet head 16t ... Ink tank 17 … Platen 18… Carriage 19… Guide shaft 20… Guide rail 21, 22… Pulley 23… Timing belt 24… CR motor (carriage motor) 25… Capping unit 26… Assist roller 27… Ejection rollers 26a, 27a… Spurs 28… Insert Mouth 29 ... Pin tractor 29a ... Tractor shaft 30 ... ASF motor 31 ... LF motor 32 ... Gear train 33 ... Release shaft 33a Gear parts 33b, 33c, 33d ... Protrusion 33e ... Sheet guide surface 34 ... LF motor gear 35 ... Reduction gear 36, 38 ... LF reduction gear 37 ... Conveying roller gear 39 ... Discharging roller gear 40 ... Clutch gear 41 ... Clutch spring 42 ... Slide cam 42b , 42c ... Cam 43 ... Tractor gear 44 ... Frame 45 ... Tractor detection sensor 100 ... Control board 101 ... MPU 102 Gate array (GA) 103 ... Dynamic RAM (DRAM) 104 ... CR motor driver (carriage motor driver) 105 ... LF motor Driver 106 ... ASF motor driver 107 ... Mask ROM (MASK ROM) 108 ... Centronics interface (I / F) board 109 ... Linear encoder 110 ... Front panel 111 ... Home position (HP) sensor 112 ... Tractor detection (RRL) sensor 113 ... Sheet detection (PE) sensor 113b ... Flag 11 4… Paper type sensor

Claims (10)

[Claims] 1. A sheet transporting device capable of selectively transporting a single-cut sheet or a continuous sheet, transporting means for transporting the sheet, a contacting means for pressing the sheet against the transporting means, and the contacting means. Between the pressing means for applying a pressing force to press the sheet against the conveying means, the switching means for pressing and releasing the contact means with respect to the conveying means, and the conveying means Guide means that face each other at a predetermined interval and guide the sheet along the conveying means, and the interval between the guide means and the conveying means changes in association with the switching operation of the switching means. A sheet conveying device characterized in that 2. The distance between the guide means and the transport means is L1 when the contact means is in pressure contact with the transport means, and L2 when the contact is released.
The sheet conveying device according to claim 1, wherein the relationship between the two changes so that L1> L2. 3. The sheet conveying device according to claim 1 or 2, wherein the guide means moves close to or away from the conveying means in conjunction with a switching operation of the switching means. Sheet transport device. 4. The sheet conveying device includes a rotating member having a protrusion having a sheet guide surface, and the protrusion of the rotating member that rotates in association with the switching operation of the switching unit conveys the sheet from the guide unit side. 2. A sheet conveying path formed between the sheet conveying means and the sheet conveying means is retracted and retracted.
Alternatively, the sheet conveying device according to claim 2. 5. The sheet conveying device includes a rotating member having a protrusion, and the protrusion of the rotating member that rotates in conjunction with the switching operation of the switching unit pushes up and releases a part of the guide unit. 3. The sheet conveying apparatus according to claim 1, wherein a part of the guide means is moved closer to or away from the conveying means. 6. The sheet conveying apparatus according to claim 1, wherein a plurality of the abutting means are arranged in the sheet conveying direction along the conveying means. . 7. The sheet conveying device according to claim 1, a platen for supporting the sheet in a recording area where recording is performed on the sheet, and a platen facing the platen. And a mounting means for removably mounting the recording means. 8. The recording apparatus according to claim 7, wherein the recording apparatus records on the sheet with ink ejected from an ink ejection port provided in the recording unit. 9. The recording means according to claim 8, wherein the recording means has an electrothermal converter that generates thermal energy that causes film boiling in the ink, as an element that generates thermal energy for ejecting ink. Recording device. 10. The recording device according to claim 9, wherein said recording means has more than 64 ink ejection ports.
The recording device according to 1.