JPH06263291A - Automatic sheet feeder and recorder - Google Patents

Abstract

PURPOSE:To correct skew feed promptly by providing one of plural feed rollers so as to regulate movement in a sheet feed direction and its opposite direction when the ends of paper sheets delivered by the plural feed rollers are registered with the sheets brought into contact with a rotating conveyance body which reversely-rotates the paper sheets. CONSTITUTION:A pressure plate 21 is supported in a base 20 where paper sheets to be recorded are stored on the rear part side of a recorder so as to be oscillated around an upper part supporting shaft, and is elastically energized to the side of plural feed rollers 5 side. The top paper sheet is delivered downstream by rotation of the feed rollers 5, carried to the recording head 49 side by the rotational conveyance body 38, the feed rollers 5 are stopped on the way of paper sheet conveyance, and the rotating conveyance body 38 is reversely-rotated to register the ends of the paper sheets. Only one of the plural sheet feed rollers 5 is provided so as to regulate movement in a sheet feed direction and its opposite direction when paper sheets are registered, and sheet rotation is carried out around the sheet feed rollers 5 as a center, thus providing prompt correction of skew feed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet automatic feeding apparatus and a recording apparatus for automatically feeding recording sheets one by one.

[0002]

2. Description of the Related Art Conventionally, recording devices such as printers, copiers, and facsimiles are based on image information transferred.
By driving the energy generator of the recording head,
An image composed of a dot pattern is recorded on a recording sheet such as paper or a thin plastic plate. The recording apparatus can be classified into an inkjet method, a wire dot method, a thermal method, and an electrophotographic method according to the recording method.

Recording sheets used in the recording apparatus include, in addition to plain paper, thick paper such as postcards and envelopes, and special sheets such as plastic thin plates. The supply of recording sheets is
In addition to manually inserting the sheets one by one, the sheets are automatically and continuously fed by an automatic sheet feeder.

In general, the sheet feeding mechanism of the above-described automatic sheet feeding device has a separation claw in which one sheet feeding roller is arranged on the left and right sides of the recording sheet, and further, both front corners of the recording sheet in the sheet feeding direction are pressed. Is arranged one by one on the left and right, and has a pressure mechanism for pressing the recording sheets against the respective paper feed rollers, so that the recording sheets are separately supplied one by one.

In addition, today, due to demands for cost reduction, size reduction, etc. by simplifying the constituent parts, a one-claw separation type configuration in which the separation claws are arranged only on one side has been adopted.

Further, the sheet automatic feeding device is particularly
In order to make the footprint small when mounted on the recording device, it is mounted at an angle to stand up.

FIG. 12 is a sectional view of a recording device using the automatic feeding device. In the figure, 101 is a paper feed roller, which is fixed on a paper feed roller shaft 102 and is rotated by receiving a driving force from a drive source (not shown). 10
Denoted at 3 is a separation claw, and denoted at 104 is a pressure plate for pressing the set recording sheet 110 against the sheet feeding roller 101 by a pressure plate spring 106. 107 is a base and is a pressure plate 1.
04 has a guide portion 107a for guiding the separated recording sheet 110. A separation sheet 105 prevents double feeding near the last sheet.

Reference numeral 111 denotes a conveyance roller for feeding the separated recording sheet 110 to the recording portion by the conveyance force of the pinch roller 118 pressed by the spring force of the pinch roller spring 121.

Reference numeral 117 denotes an upper guide for separating the separated recording sheet 110 together with a guide portion 107a on the base 107.
It guides to the conveyance roller 111 and is provided over the entire width direction of the recording sheet 110.

The recording sheet 110 sent to the recording unit
Is supported by the platen 120 and the guide shaft 116.
By the recording head 115 mounted on the carriage 119 that reciprocates above the recording sheet 110 in the width direction,
Will be recorded. After that, the recording sheet 110 is discharged by the discharge roller 113 and the pressure contact roller 114, which are driven by the driving force of the conveying roller 111 given by the transmission roller 112.

Usually, in the above-described automatic sheet feeding apparatus, when the recording sheet 110 is fed to the recording portion, the following registration is performed and then the sheet is fed.

FIG. 13 shows the operation of the recording sheet 110 fed by the feeding roller 101 (see FIG. 13).
(A)), Once the transport roller 111 and the pinch roller 1
It comes out beyond the pressure contact portion 18 (FIG. 13B). Next, the feeding roller 101 is stopped, the conveying roller 111 is rotated in the reverse direction, and the leading edge of the recording sheet 110 is returned to the pressure contact portion between the conveying roller 111 and the pinch roller 118 as shown in FIG. A loop is formed between the feeding roller 101 and the conveying roller 111. By the loop at this time, the leading end of the recording sheet 110 is aligned with the pressure contact portion of the transport roller 111 and the pinch roller 118, and the registration is aligned. After that, the recording sheet 110 is sent to the recording unit by the transport roller 111.

[0013]

[Problems to be Solved by the Invention]

(First Problem) However, in the above conventional example,
All the feeding rollers 101 are stopped, and the feeding rollers 111
Since the sheet 110 is returned by the reversal of the sheet 110 to form a loop, if the skew amount of the fed sheet 110 is more than a certain amount, the loop cannot be resolved only by the loop, and the skew does not occur even after registration. It had the serious drawback of being left behind.

Particularly in today's demand for downsizing, the distance between the feeding roller 101 and the conveying roller 111 is shortened, and there is no space for forming a loop.
In the conventional registration registration method, the sheet 110 is further added.
The drawback is that it becomes difficult to remove the skew.

The present invention is intended to make up for the above-mentioned drawbacks, and provides an automatic sheet feeding apparatus and a recording apparatus which can favorably perform skewing even if the apparatus is downsized and the space for loop formation is reduced. With the goal.

(Second Problem) Further, in the above-mentioned conventional example, since the upper guide 117 has the full width of the sheet, when the separation claw 103 separates the tip corners of the sheet 110 by forming a loop. Before the loop is completely returned, the leading end of the sheet 110 hits the upper guide 117, causing serious defects such as sheet folding and sheet jamming. In particular, the above-mentioned phenomenon has been remarkably caused by feeding in the direction in which the loop becomes large in the separating portion such as A-4 size horizontal, B-4 size vertical, etc. depending on the paper's skid direction.

A second aspect of the present invention is intended to supplement the above-mentioned second object, and is an automatic sheet feeding system that separates and feeds sheets without obstacles such as sheet folds and sheet jams, regardless of the sheet skew direction. An object is to provide a feeding device.

[0018]

[Means for Solving the Problems]

(1st invention) In order to achieve the 1st object, in 1st invention, the seat support expedient which supports the seat, the plural rotary feed which feeds the seat which is supported by the seat support expedient The feeding body, the rotary conveyance body that conveys the sheet sent out by the rotary feeding body, and the rotation feeding body and the rotary conveyance body are normally rotated to convey the sheet, and the rotation feeding body is stopped midway In the automatic sheet feeding device, the rotation feeding body and the control means for controlling the rotation feeding body to align the leading end of the sheet with the rotation feeding body by rotating the rotation feeding body in the reverse direction are provided. It is characterized in that only one of the plurality of rotary feeding bodies regulates the movement of the sheet in the direction opposite to the feeding direction when the conveying body rotates in the reverse direction.

The plurality of rotary feeding members are composed of a plurality of feeding rollers attached to the rotating shaft, and one of the feeding rollers is attached to the rotating shaft with a play. Is good.

Further, the plurality of rotary feeding members are composed of a plurality of feeding rollers attached to the rotary shaft, and the feeding rollers which do not regulate the movement of the sheet in the reverse direction have a low friction resistance at the time of the stop. A member that comes into contact with the seat may be provided.

Further, a sheet supporting means for supporting the sheet, a plurality of rotary feeding bodies for feeding the sheet supported by the sheet supporting means, and a rotary transport for transporting the sheet fed by the rotary feeding body. And a recording unit that records an image on the sheet conveyed by the rotary conveyance body, and the sheet is conveyed by rotating the rotation conveyance body and the rotation conveyance body in the forward direction, and the rotation conveyance body in the middle thereof. And a control means for controlling the rotary feeding body and the rotary transport body so as to align the leading edge of the sheet with the rotary transport body by stopping the rotation transport body and rotating the rotary transport body in the reverse direction. It is characterized in that only one of the plurality of rotary feeding bodies restricts the movement of the sheet in the direction opposite to the feeding direction when the body rotates in the reverse direction.

Further, a separating means disposed at at least one end in the sheet width direction for separating the sheets one by one,
In a sheet automatic feeding device having a guide member that guides a sheet separated by the separating means to a rotary conveyance body, a step is formed at a portion of the guide member where the separating means is located in a direction in which the sheet escapes from the sheet. It is characterized in that a relief portion is provided.

[0023]

[Action]

(Operation of the First Invention) In the first invention having the above-described structure, only one of the plurality of rotary feeding members moves in the direction opposite to the sheet feeding direction when the rotary conveying member rotates in the reverse direction. Since it is restricted, the entire sheet rotates around the position where the movement is restricted, and the skew is corrected.

When the plurality of rotary feeding members are composed of a plurality of feeding rollers attached to the rotating shaft, and one of the feeding rollers is attached with a play with respect to the rotating shaft, The entire sheet rotates with the movement of the feed roller attached with play around the feed roller attached without any play on the shaft, and the skew is corrected.

Further, the plurality of rotary feeding bodies are composed of a plurality of feeding rollers attached to the rotary shaft, and the feeding rollers which do not regulate the movement of the sheet in the opposite direction are brought into contact with the sheet with a low friction resistance when stopped. In the case that the contact members are provided,
The entire sheet rotates around the feeding roller, which is provided with a member that comes into contact with the sheet with low frictional resistance, around the feeding roller that is not provided with a member that comes into contact with the sheet with low frictional resistance. Is corrected.

(Operation of the Second Invention) In the second invention having the above-mentioned structure, when the separating means forms the loops at the corners of the leading edge of the sheet to separate the guide members, Since the part where it is located has a step in the direction that escapes from the sheet, the tip of the sheet does not hit the guide member, and it is possible to properly separate and feed the sheet without causing sheet folds or sheet jams. become.

[0027]

【Example】

[Embodiment of the First Invention] (Embodiment 1) FIGS. 1 to 10 show an embodiment of the present invention. The present embodiment is a recording device integrated with an automatic sheet feeder, and is composed of a paper feed unit, a paper feed unit, a paper discharge unit, a carriage unit, and a cleaning unit. First, the general configuration and operation of these will be described.

FIG. 1 shows a perspective view of the overall construction of the recording apparatus 1, FIG. 2 shows a front view of the paper feed section, and FIG. 3 shows a side view of the paper feed section.

The paper feed unit 11 is attached to the main body side at an angle of 30 ° to 60 °, and the set recording sheet P is horizontally discharged after printing. The paper feeding unit 11 includes a feeding roller 5c as a rotary feeding body attached to the rotating shaft 5b, a separating claw 17 as a separating unit,
The movable side guide 19, the base 20, the pressure plate 21, the pressure plate spring 72, the drive gears 25 to 30, the release cam 31, the pawl spring 32, the release lever 33, the release cam 35, and the like. Since the release cam 31 normally pushes the pressure plate 21 down to the position shown in FIG. 5, the recording sheet P is separated from the feeding roller 5.

With the recording sheet P set, the feeding rollers 5 are driven by the drive gears 25 to 30 of the conveying roller 36.
c and the release cam 31. Release cam 31
When is separated from the pressure plate 21, the pressure plate 21 rises to the position shown in FIG. 6, the feeding roller 5c contacts the recording sheet P, is picked up as the feeding roller 5c rotates, and is separated one by one by the separating claw 17. . The separated recording sheet P is sent to the paper feeding unit 12. Feed roller 5c and release cam 3
1 rotates once until the recording sheet P is sent to the paper feeding unit 12, and the driving from the feeding roller 5c is cut off in the state where the pressure plate 21 is released to the feeding roller 5c again, and this initial state is maintained.

The paper feeding section 12 comprises a conveying roller 36, a pinch roller 37, a pinch roller guide 39, a pinch roller spring 40, a PE sensor 42, a PE sensor spring 43, an upper guide 45, a platen 46 and the like. The transport roller 36 and the pinch roller 37 form a rotary transport body 38. The recording sheet P sent to the paper feeding unit 12 is printed on the platen 4
6 and the pinch roller guide 39, and the upper guide 45 as a guide member are used as guides to be sent to the roller pair of the conveying roller 36 and the pinch roller 37.

A PE sensor lever 41 is provided in front of the roller pair 36 and 37, detects the leading edge of the recording sheet P, and obtains the print position on the recording sheet P. The pinch roller 37 urges the pinch roller guide 39 by a pinch roller spring 40, so that the conveying roller 3
It is pressed against 6 to generate a conveying force to the recording sheet P. The roller pair 36, 37 is driven by an LF motor 47, and the roller pair 36, 37 rotates, so that the recording sheet P advances along the platen 46,
Recording is performed by the recording head 49 based on predetermined image information. The recording head 49 is an easily replaceable inkjet recording head that is configured integrally with the ink tank. In the present embodiment, the recording head 49 is provided with an electric exchanger, and ink is ejected from an ejection port by utilizing pressure change caused by growth and contraction of bubbles due to film boiling generated by applied thermal energy to perform recording. It is something to do.

The carriage unit 15 includes a carriage 50 on which a recording head 49 as a recording unit is mounted, a guide shaft 51 for reciprocating the carriage 50 in a direction perpendicular to the conveyance direction of the recording sheet P, and a rear portion of the carriage 50. A guide 52 for holding the end and maintaining the space between the head and the paper, a timing belt 55 for transmitting the drive of the carriage motor 53 to the carriage 50, an idle pulley 56 for stretching the timing belt 55, a recording head 49 from an electric board. Flexible board 57 for transmitting a head drive signal
Etc. The recording sheet P conveyed on the platen 46
The image is formed on the carriage 50 by reciprocally scanning the carriage 50 having the recording head 49 mounted thereon.

The paper discharge section is provided with a paper discharge roller 59, a transmission roller 60 for transmitting the drive of the conveying roller 36 to the paper discharge roller 59, a spur 61 for assisting the discharge, and a paper discharge tray 62. The image on the recording sheet P is discharged onto the discharge tray 62 without being stained by the discharge rollers 59 and the spurs 61.

The cleaning unit 16 drives the pump 63 for cleaning the recording head 49, the cap 65 for suppressing the drying of the recording head 49, and the drive switching arm 66 for switching the drive from the conveying roller 36 to the paper feeding unit 11 and the pump 63. It consists of The drive switching arm 66 is in the position shown in FIG. 1 except during paper feeding and cleaning, and the planet gear (not shown) that rotates around the axis of the transport roller 36 is fixed at a predetermined position. The drive of the roller 36 is not transmitted to the pump 63 and the paper feeding unit 11. When the drive switching arm 66 is moved in the direction of arrow A by moving the carriage 50, the transport roller 3
The planetary gear moves in accordance with the forward rotation and the reverse rotation of 6, and the drive is transmitted to the paper feeding unit 11 when the transport roller 36 rotates in the forward direction and the drive is transmitted to the pump when the reverse rotation occurs.

Here, the LF motor 47 for driving the conveying roller 36 and the carriage motor 53 for driving the carriage 50 are stepping motors which rotate by a predetermined angle in response to a signal sent from a motor driver (not shown). I am using.

The feeding roller 5c is provided with a sensor plate 69 having a radius smaller than the diameter of the feeding roller rubber 67 attached to the feeding roller 5c. The sensor plate 69 is partially cut away, and only when the feeding roller 5c and the release cam 31 are at the initial position for releasing the pressure plate 21 shown in FIG. 5, the photo interrupter or the like directly provided on the electric board 70 is used. The roller sensor 71 is configured to be in a light-transmitting state without being shielded. This sensor plate 6
By detecting the state of No. 9, it is possible to detect the angular position of the feeding roller 5c and the angular position of the release cam 31 that is in phase with and interlocked with the feeding roller 5c, and in the feeding sequence of the recording sheet P. The timing of control can be timed.

The paper feeding sequence is controlled by a controller (not shown) including a microcomputer.

Next, the details of each main part of the paper feeding unit 11 will be described.

The paper feed unit 11 is a unit in which the components of the paper feed unit are attached to the base 20. The paper feeding unit 11 of this embodiment is based on one side of the recording sheet P, and the inside of the right side plate of the base 20 is the paper reference.
The base 20 has a recess for forming the pressure plate spring 72 at a position where the pressure plate 21 can be retracted as shown in FIG. 5 and which is substantially opposed to a later-described roller portion 5C of the feeding roller 5c. The pressure plate 21 is connected to the base 20 by pressure plate shafts 21b at the upper ends of both ends and is rotatable about the pressure plate shaft 21b. At the position of the feed roller of the pressure plate 21, a separation pad 7 made of artificial leather or the like having a relatively high friction coefficient is used.
3 is provided to prevent double feeding when the number of sheets becomes small. A movable side guide 19 that can slide left and right on the pressure plate 21 is attached so that recording sheets P of different sizes can be set on the paper reference surface.

In FIG. 9, the rotary shaft 5b to which the feeding roller 5c is attached is rotatably held at both ends by the base 20. The feeding roller 5c is engaged with the groove 5b-1 provided on the rotary shaft 5b and the protrusion 5c-1. As shown in the figure, the convex portion 5c-1 has a play in the rotational direction of the feeding roller 5c and is fitted into the groove portion 5b-1. The relationship between the groove portion 5b-1 and the convex portion 5c-1 is such that the feeding roller 5c abuts on the side where the phases of the half-moon portions of the feeding roller 5c are the same in the forward rotation direction. Further, around each feeding roller 5c, a feeding roller rubber 67 for carrying the recording sheet P is provided. A roller roller 75 having a radius smaller than the radius of the feeding roller rubber 67 attached to the feeding roller 5c by 0.5 to 3 mm is provided on the outer side of each feeding roller 5c. Image disturbance or displacement of the feeding roller 5c caused by touching the roller rubber 67 of the feeding roller 5c is prevented.

The drive switching arm 66 of the cleaning section 16 is moved by the carriage 50 in the direction of arrow A,
When the transport roller 36 is rotated in the normal direction, a planet gear (not shown) moves and meshes with the input gear 25, whereby the drive is transmitted to the paper feeding unit 11. The input gear 25 is an idler gear 26, 27.
The recording sheet P can be conveyed by transmitting the drive to the feeding roller gear 28 coupled to the feeding roller 5c via and rotating the feeding roller 5c. Further, the feeding roller gear 28 includes a clutch gear 28 and an idler gear 30.
The drive is transmitted to the release cam 31 via. At this time, the feeding roller 5c and the release cam 31 are configured to be in phase with each other for each rotation, and in the state where the pressure plate 21 shown in FIGS. As shown in, the half-moon portion is arranged to face the pressure plate 21. The release cam 31 is provided only when the half-moon angle of the feeding roller 5c is about 120 °.
1 is released, and the feeding roller 5c
The recording sheet P is configured to be in pressure contact with the feeding roller 5c without exception when the sheet other than the half-moon portion thereof faces the pressure plate 21. Further, the release cam 31 releases the pressure plate 21 by pushing down the push-down portion 21c of the pressure plate 21 which is protruded from the hole opened in the left side plate of the base 20. At this time, the pressure plate cam 76 attached to the base 20 is pushed down by the cam 21d on the side closer to the push-down portion 21c of the pressure plate 21, and the pressure plate cam 76 rotates about the center 76b. Then, the pressure plate cam 76 pulls down the cam 21f outside the left feeding roller 5c. As described above, even when the push-down portion 21c at the end of the pressure plate 21 is lowered, the pressure plate 21 is not tilted with respect to the base 20 and is released substantially in parallel. A clutch spring 77 is provided inside the clutch gear 29, and is indicated by an arrow B in FIG.
The direction is such that the spring is closed so that the feeding roller 5c does not reverse. Further, since the portion of the clutch spring 77 that is fitted to the base 20 is fitted with a play, the feed roller 5 is provided for that play.
c can be reversed.

The separating claw 17 is rotatable around a center 17b, and the claw spring 32 allows the separation of the recording sheet P and the pressure plate 21.
It is urged with a force of 0 to 100 g. The separation claw 17 is
A so-called plain paper recording sheet P is separated when it is fed, and is provided only on the paper reference side as shown in FIG. 2, and has a shape in which the corners of the recording sheet P are covered with a triangle. . The recording sheets P can be separated one by one by receiving the resistance in the triangular portion. Further, when separating thick paper or the like other than plain paper, the separation claw 17 is used to separate the recording sheet P.
By abutting the lower guide portion 20b of the base 20 without hitting it, it is possible to separate the sheets one by one by using the resistance of the guide portion 20b.

The release lever 33 and the release cam 35 are
It is provided coaxially with the release cam 31. The release lever 33 and the release cam 35 are independent of the release cam 31 and are independent of each other.
Is operated when setting. The release lever 33 and the release cam 35 are connected by a gear, and the release lever 33 has three positions of a feed position, a thick paper setting position, and a plain paper setting position, and each position is about 20 ° to 5 °.
They are provided at angular position intervals of 0 °. Corresponding to the three positions of the release lever 33, the mutual gear ratios are set so that the release cam 35 rotates by about 90 °. In the feed position, the release cam 35 moves the pressure plate 2
1 push-down section 21c and separation claw 17 push-down section 17
Does not work for c. It is in this position during normal paper feeding. At the thick paper setting position, since the release cam 35 pushes down only the pressing portion 21c of the pressure plate 21, the separation claw 17 is lowered along the pressure plate 21, and the thick paper setting in which the separation claw 17 is not applied to the recording sheet P can be performed. In the plain paper setting position, the release cam 35 pushes down both the push-down portion 21c of the pressure plate 21 and the push-down portion 17c of the separation pawl 17, so that the separation pawl 17 is pressed by the separation pawl 17.
Therefore, plain paper can be set by putting the separation claw 17 on the recording sheet P.

The above-mentioned gear group (excluding the feeding roller shaft 79), the separating claw 17, the release lever 33, the release cam 35, etc. are provided on the shaft installed on the right side plate of the base 20, It is rotatably attached to the center.

The operation when registering is performed with the above configuration will be described. The recording sheet P fed by the feeding roller 5c (FIG. 8A) is temporarily transferred to the feeding roller 3c.
6 and the pinch roller 37 are pressed to the end (FIG. 8B). Next, the feeding roller 5c is stopped, the conveying roller 36 is rotated in the reverse direction, and the leading edge of the recording sheet P is returned to the pressure contact portion between the conveying roller 36 and the pinch roller 37 as shown in FIG. A loop is formed between the feed roller 5c and the transport roller 36. At the time of forming the loop, the feeding roller 5c has a backlash, and therefore the feeding roller 5c that stops the trailing edge of the recording sheet P fed obliquely is fed.
Depending on the direction of the skew, only one of the feeding rollers 5c stops so as to absorb the skewed portion, and the other feeding roller 5c moves in the direction of the arrow B in FIG. 9 together with the rotating shaft 5b. Turned to. Therefore, the recording sheet P is rotated around the stopped feeding roller 5c, and the leading edge of the recording sheet P comes into contact with the pressure contact portion between the conveying roller 36 and the pinch roller 37, so that the skew is taken. become.
After that, the recording sheet P is sent to the recording unit by the transport roller 36.

(Second Embodiment) A second embodiment will be described with reference to FIG.

The structure other than the feeding roller 5c is the same as that of the first embodiment. In FIG. 10, the feeding roller 5c is
The rotary shaft 5b and the two feeding rollers 5c are integrally configured,
Ribs (members that come into contact with the sheet with low friction resistance) 5c-2 protruding outward from the outer peripheral surface of the feeding roller rubber 67 are provided on one side of the feeding roller 5c. Rib 5c
The position -2 is provided at a position where the rear end of the recording sheet P is pressed when the transport roller 36 reverses during registration. Further, since the rotary shaft 5b and the feeding roller 5c are integrally formed of resin, the outer peripheral surface 5c-2a of the rib 5c-2 is a low friction resistance surface.

When the registration operation is performed by the above-described structure, when the recording sheet P forms a loop between the feeding roller 5c and the conveying roller 36, the trailing edge of the recording sheet P fed obliquely is fed. One of the feeding rollers 5c that has stopped the
Since the rib 5c-2, which has a low friction resistance surface, presses the recording sheet P, the recording sheet P is stopped on the side of the other feeding roller 5c without the rib 5c-2 and has the rib 5c-2. It will be slipped back on the side of the feeding roller 5c. Therefore, similarly to the first embodiment, the recording sheet P is rotated around the stopped feeding roller 5c, and the leading end of the recording sheet P is attached to the pressure contact portion between the conveying roller 36 and the pinch roller 37. Will come into contact with each other and the skew can be removed. After that, the recording sheet P is sent to the recording unit by the transport roller 36.

In this embodiment, the rib is made to protrude from the feeding roller rubber, but the same effect can be obtained even if the rubber portion is attached to a portion other than the portion where the rib is provided.

[Embodiment of the Second Invention] An embodiment of the second invention will be described below. The same components as those of the embodiment according to the first invention are designated by the same reference numerals and the description thereof will be omitted.

(Third Embodiment) In this embodiment, the upper guide 4 is used.
As shown in FIG. 11, the separation claw 17 is a portion where the separation claw 17 is located, and is stepped in a direction away from the recording sheet P from other portions in the width direction to form an escape portion 45a.
The loop return of the recording sheet P after separation due to is not disturbed (hatched portion in the figure).

[0053]

【The invention's effect】

(Effect of the first invention) As described above, according to the present invention, only one of the plurality of rotary feeding bodies moves in the direction opposite to the sheet feeding direction when the rotary transport body rotates in the reverse direction. Since it is restricted, the entire sheet rotates around the position where the movement is restricted, and the skew is corrected.

The rotary feeder comprises a rotary shaft and a plurality of feed rollers attached to the rotary shaft, and one of the feed rollers is attached to the rotary shaft with play. In such a case, the entire sheet rotates around the feeding roller attached without any play on the rotating shaft together with the movement of the feeding roller attached with play, and the skew is corrected.

Further, the rotary feeding member comprises a rotating shaft and a plurality of feeding rollers attached to the rotating shaft, and the feeding roller which does not regulate the reverse movement of the sheet has a low frictional resistance when stopped. When a member that comes into contact with the sheet is provided in, the entire sheet is provided around the feeding roller that does not have a member that comes into contact with the sheet with low frictional resistance, and a member that comes into contact with the sheet with low frictional resistance is provided. It rotates while slidingly contacting the supplied feeding roller, and the skew is corrected.

As a result, since it is possible to supplement the first problem, it is possible to provide a small-sized and highly reliable automatic sheet feeder having a small footprint.

(Effect of the Second Invention) According to the second invention, in the sheet automatic feeding device having the one-claw separation method, the two-claw separation method, or the like, the sheets separated by the separation means are rotated. By forming a step in the direction of escape from the sheet in the portion of the guide member that guides the conveyance body, where the separating means is located, when the separating means forms a loop at the tip corners of the sheet, The leading edge of the sheet does not collide with the guide section, and it becomes possible to properly separate and feed the sheet without causing sheet breakage, sheet jamming, and the like.

As a result, the second problem can be compensated, so that it is possible to provide a compact and highly reliable automatic paper feeder having a small footprint.

[Brief description of drawings]

FIG. 1 is a perspective view of an automatic sheet feeding device according to a first embodiment of the first invention.

FIG. 2 is a front view of the automatic sheet feeding device.

FIG. 3 is a side view of the automatic sheet feeding device.

FIG. 4 is a side view of the automatic sheet feeding device.

FIG. 5 is a cross-sectional view of a sheet feeding unit of the sheet automatic feeding device.

FIG. 6 is a cross-sectional view of a sheet feeding section of the automatic sheet feeding apparatus.

FIG. 7 is a sectional view of the same sheet automatic feeder.

FIG. 8 is an operation explanatory diagram of a sheet feeding operation of the same sheet automatic feeding device.

FIG. 9 is a perspective view of a feeding roller portion of the automatic sheet feeding device.

FIG. 10 is a perspective view of a feeding roller portion of an automatic sheet feeding device showing a second embodiment of the invention.

FIG. 11 relates to a sheet automatic feeding device of a third embodiment according to the second invention, (a) is a cross-sectional view of a main part of the device, and (b) is a sectional view.
[Fig. 3] is a schematic perspective view of a main part of the device.

FIG. 12 is a sectional view of a conventional automatic sheet feeder.

FIG. 13 is an operation explanatory view of the sheet feeding operation of the same sheet automatic feeding device.

[Explanation of symbols]

5b rotating shaft 5c feeding roller (rotating feeding body) 5c-2 rib (member that comes into contact with a sheet with low friction resistance when stopped) 38 rotating conveying body 17 separating claw (separating means) 21 pressure plate (sheet supporting means) 45 top Guide (guide member) 45a Escape portion 49 Recording head (recording means) P Recording sheet (sheet)

Claims (5)

[Claims] 1. A sheet supporting means for supporting a sheet, a plurality of rotary feeding bodies for feeding the sheet supported by the sheet supporting means, and a rotary conveyance for conveying the sheet fed by the rotary feeding body. The body and the rotary feeding body and the rotary conveying body are normally rotated to convey the sheet, and in the middle of the rotation, the rotary feeding body is stopped and the rotary conveying body is reversely rotated to align the leading end of the sheet with the rotary conveying body. In order to control the rotary feeding body and the rotary conveying body in order to control the sheet automatic feeding device, only one of the plurality of rotary feeding bodies when the rotary conveying body is reversely rotated. The sheet automatic feeding device is characterized in that the movement of the sheet is restricted in the direction opposite to the sheet feeding direction. 2. The plurality of rotary feeding bodies comprises a plurality of feeding rollers attached to a rotating shaft, and one of the feeding rollers is attached to the rotating shaft with a play. Item 1. The automatic sheet feeder according to item 1. 3. The plurality of rotary feeding members comprises a plurality of feeding rollers attached to a rotary shaft, and the feeding rollers that do not regulate the movement of the sheet in the opposite direction have a low friction resistance when the sheet is stopped. The automatic sheet feeding device according to claim 1, further comprising a member that comes into contact with the sheet. 4. A sheet supporting means for supporting a sheet, a plurality of rotary feeding bodies for feeding the sheet supported by the sheet supporting means, and a rotary conveyance for conveying the sheet fed by the rotary feeding body. And a recording unit that records an image on the sheet conveyed by the rotary conveyance body, the sheet is conveyed by rotating the rotation conveyance body and the rotation conveyance body in the forward direction, and the rotation conveyance body is in the middle thereof. And a control means for controlling the rotary feeding body and the rotary transport body so as to align the leading edge of the sheet with the rotary transport body by stopping the rotation transport body and rotating the rotary transport body in the reverse direction. A recording apparatus, wherein only one of the plurality of rotary feeding bodies regulates the movement of the sheet in the direction opposite to the feeding direction when the body rotates in the reverse direction. 5. A separating member arranged at least at one end in the sheet width direction for separating the sheets one by one, and a guide member for guiding the sheet separated by the separating unit to a rotary conveyance body. In the automatic feeding device, an automatic sheet feeding device is provided, in which a portion of the guide member where the separating means is located is provided with a relief portion that forms a step in a direction in which the sheet escapes from the sheet.