JP3363827B2 - Automatic feeding device and recording device using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic feeding device capable of sequentially feeding sheet materials, and a recording device using the automatic feeding device.

[0002]

2. Description of the Related Art Conventionally, a recording apparatus provided with an automatic feeding device such as a printer, a copying machine, a fax machine or the like drives a recording head based on image information so that dots are formed on a sheet material such as paper or a plastic thin plate. It is configured to form an image. Then, the recording device has an ink jet type, a wire dot type, a thermal type,
An electrophotographic type is known. In addition to plain paper, there are special paper materials such as postcards, envelopes, and other thick papers, and plastic thin plates, etc. as the sheet material used in the recording apparatus. A method of manually feeding sheets one by one or automatically and continuously by an automatic sheet feeder is known. When the automatic feeding device automatically and continuously feeds the sheet materials one by one, a claw separation method using a separation claw that presses the tip corner portion of the sheet material is widely used. Note that the claw separation method uses the resistance of the separation claws to generate undulations of the sheet material at the tip corners of the sheet material to separate the sheet materials one by one, and has a relatively simple structure and high reliability. Sex has been obtained.

Further, when an image is formed on a sheet material by the recording head, if a force is applied to the sheet material, the feeding accuracy of the sheet material is affected, so that the feeding rotating body does not apply a force to the sheet material. By performing an operation of separating the stacking unit and the feeding rotating body, the sheet feeding accuracy is secured.

[0004]

However, as shown in FIG.
When the separation claw 17 is provided only on one side of the tip corner of the sheet material P as shown in FIG. 5, the tip corner of the side of the sheet material P where the separation claw 17 is not provided hits the guide surface 20b. The sheet material P is supported in an open state, and the tip corner portion is deformed by the weight of the sheet material P itself. For this reason, even if the bias of the pressure plate 21 (loading means) that biases the sheet material to the separating claw 17 is released, the sheet material P moves following the pressure plate 21 because the sheet material is deformed. There are cases where it does not exist. In such a case, when the number of placed sheet materials P is small, the separating claw 17 does not properly contact the sheet material P, which causes a problem of double feeding of the sheet material P. For this reason, the amount of contact when the separation claw 17 comes into contact with the sheet material P is increased.
As a result, the sheet material P cannot be detached, and the resistance of the separation claw 17 at the time of separation becomes large, which causes a paper feed failure or a jam.

In view of this, the present invention uses an automatic feeding device that does not cause double feeding of sheet materials P or defective feeding such as jamming due to deformation of the sheet materials P even when the number of sheet materials P is small. It is an object to provide a recording device.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and includes support means for rotatably supporting sheet stacking means for stacking sheet materials, and stacking means for the sheet stacking means. And a feed claw that feeds the sheet material, a separation claw that prevents double feeding of the sheet material when the feed rotator feeds the sheet material, and a sheet material feed of the feed rotator. Rotation means for rotating the sheet stacking means so as to bring the sheet material stacked on the sheet stacking means into contact with or away from the feeding rotating body according to the operation, and the sheet stacking means by the rotating means. And a means for increasing the amount of engagement of the separation claw with respect to the sheet material when the stacked sheet materials are separated from the feeding rotating body by rotating the sheet feeding device. It is in.

The separating claw is provided at a tip corner portion of either one of the sheet materials stacked on the sheet stacking means.

Further, the shaft hole of the rotary shaft which is rotatable so that the separation claw comes into contact with or retracts from the sheet stacking means is a tapered hole. In this case, the tapered hole is a tapered hole that connects the round hole and the elongated hole.

Further, the means for increasing the engagement amount of the separation claw includes a guide member provided on the support means and a biasing member for biasing the separation claw.

Further, the separating claw is retracted from the sheet stacking means in a standby state in which the sheet material is not fed.

Further, the rotating means has a separating claw rotating portion for rotating the separating claw so as to come into contact with or retract from the sheet stacking means.

Further, the supporting means has a sheet stacking means urging member for urging the sheet stacking means in the direction of the feeding rotary member. In this case, the rotating means contacts the release member provided in the sheet stacking means to separate the sheet stacking means from the feeding rotating body against the sheet stacking means urging member. Is characterized by.

Further, the rotating means is a cam, which is rotated by receiving a driving force for rotating the feeding rotating body.

Further, the feeding rotary member is a half-moon shaped feeding roller having a cutout portion, and the cutout portion is held facing the sheet stacking means in a state where the sheet material is not fed. It is characterized by

Further, the present invention comprises an automatic feeding device having the above-mentioned respective characteristics, and a recording means for recording on the sheet material fed by the automatic feeding device. It is in.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. The recording apparatus 1 having an automatic paper feeding function includes a paper feeding unit 11, a paper feeding unit 12, and a paper ejection unit 1.
3, a carriage unit 15, and a cleaning unit 16. Therefore, these will be described in order by dividing them into items. 1 is a perspective view showing the overall configuration of the recording apparatus, and FIG. 2 is a sectional view of the configuration.

(A) Paper Feeding Section A front view of the paper feeding section 11 is shown in FIG. 3, and side views thereof are shown in FIGS.
As shown in FIG. The sheet feeding unit 11 includes a pressure plate 21 (sheet stacking unit) on which the sheet material P is placed, and a feeding rotating body 5 that feeds the sheet material P. A movable side guide 19 is movably provided on the pressure plate 21 to regulate the mounting position of the sheet material P. A base 20 (supporting means) is provided on the back side of the pressure plate 21, and the base 20 includes:
As shown in FIGS. 7 to 10, an operation lever 33 having a release cam 31 (rotating means) and a release cam 35 is provided. Further, as shown in FIGS. 2 and 5, etc., a separating claw 17 having a tip portion 23 is provided below the pressure plate 21 (for example, downward in FIG. 5). The separating claw 17 is provided with a rotating portion 17b having a rotating shaft so that the separating claw 17 can be rotated, and the claw spring 32 (biasing member) serves as the rotating portion 17b and the tip of the separating claw 17. It is provided between the pressure plate 21 and the pressure plate 21.
Further, pressure plate shafts 21b are provided above both ends of the pressure plate 21, and the pressure plate 21 is connected to the base 20 by the pressure plate shafts 21b and rotatable about the pressure plate shafts 21b. The pressure plate 21 is biased toward the feeding rotary member 5 by a pressure plate spring 72 (sheet stacking means biasing member).
Furthermore, in the part of the pressure plate 21 facing the feeding rotary body 5,
A separating pad 73 made of a material having a large friction coefficient, such as an artificial leather, is provided to prevent double feeding of the sheet materials P when the number of the sheet materials P is reduced.

Both ends of the feeding rotary member 5 are held by the base 20 so that they can be rotated, and the driving force of the conveying roller 36 is transmitted by the driving gears 25 to 30. The feeding rotating body 5 is an integrally molded product made of plastic or the like, which includes the shaft portion 5b and the roller portion 5c, and the feeding surface for feeding and conveying the sheet material P is provided on the peripheral surface of the roller portion 5c. A rotating rubber 67 is provided. Further, the roller portion 5c is formed in a D shape (or a half-moon shape), and the outside of each of the roller portions 5c is 0.5 from the radius of the feeding rotary body rubber 67 attached to the feeding rotary body 5. ~
A roller roller (not shown) having a radius smaller than 3 mm is provided. By the roller roller, the sheet material P touches the roller rubber 67 of the feeding rotating body 5 except when the sheet is being fed, so that the image is prevented from being stained and the sheet material P is not displaced. Further, two roller portions 5c are provided, and the paper reference PKO
They are fixed at positions of about 40 mm and about 170 mm, respectively. As a result, when the sheet material P is A4 size, 2
The sheet material P is conveyed by one roller portion 5c, and when the sheet material P has a small size such as a postcard, it is conveyed by one roller on the paper reference PKO side. The feeding rotating body 5 is provided with a sensor plate 69 having a radius smaller than the diameter of the feeding rotating body rubber 67 attached to the feeding rotating body 5. The sensor plate 69 is provided with a partial cutout, and the position where the pressure plate 21 is released so that the feeding rotary body 5 and the release cam 31 release the contact between the feeding rotary body 5 and the sheet material P. (See FIG. 2) That is, only in the standby state, the roller sensor 72 formed of a photo interrupter provided on the electric substrate 70 can receive light. Therefore, by detecting the state of the sensor plate 69, the angular position of the feeding rotating body 5 and the feeding rotating body 5 are detected.
It is possible to detect the angular position of the release cam 31 that is interlocked with the same phase as, and to control the timing of the sheet material P feeding sequence. Further, the paper feeding unit 11 having the above-mentioned configuration has
It is attached to the main body of the recording apparatus 1 at an angle of °.

In the above structure, the release cam 31 pushes down the push-down portion 21c (release member) of the pressure plate 21 in the standby state (see FIG. 5). As a result, the contact between the sheet material P placed on the pressure plate 21 and the feeding rotating body 5 is released. Then, in this standby state, the transport roller 36
The driving force of the feeding rotary member 5 is generated by the gears 25 to 30.
And transmitted to the release cam 31, the release cam 3
Since 1 is separated from the push-down portion 21c of the pressure plate 21, the pressure plate 2
1 rises to the position shown in FIG. 6 (raises to the left in FIG. 6), and the separation claw 17 provided on the lower portion of the pressure plate 21 comes into contact with the surface of the sheet material P accordingly. At the same time, the feeding rotary body 5 and the sheet material P come into contact with each other, and the sheet material P is picked up and fed as the feeding rotary body 5 rotates. Then, the sheet material P is separated one by one by the separation claw 17 and sent to the paper feeding unit 12.
Further, the feeding rotary member 5 and the release cam 31 are made of the sheet material P.
Is rotated (one rotation) until it is fed to the paper feeding unit 12, and the contact state between the sheet material P and the feeding rotary member 5 is released again, and the driving force from the paper feeding roller 5 is cut off.

Further, as described above, since the pressure plate 21 is provided with the variable side cover 19, the variable side cover 19 regulates the side end portion (left side in FIG. 3) of the sheet material P, and The other end (right side in FIG. 3) is regulated by the paper reference PKO. This makes it possible to regulate the placement position even if the sheet materials P have different sizes.

(B) Paper Feeding Section The paper feeding section 12 (see FIGS. 2 and 3) has a carrying roller 36 for carrying the sheet material P and a PE sensor 42.
A pinch roller 37 having a pinch roller guide 39 that follows the transport roller 36 is provided in contact with the transport roller 36. The pinch roller guide 39 is urged by the pinch roller spring 40 to press the pinch roller 37 against the conveying roller 36, thereby generating a conveying force for the sheet material P. Further, an upper guide 45 and a platen 46 for guiding the sheet material P are arranged at the entrance 7 (see FIG. 2) of the sheet feeding unit 12 to which the sheet material P is conveyed. A PE sensor lever 41 is arranged above the upper guide 45. Further, a recording head 49 that forms an image based on image information is provided behind the conveyance roller 36 (on the left side in FIG. 2).
Is provided.

In the above structure, the sheet material P sent to the paper feeding section 12 is fed to the platen 46 and the pinch roller guide 39.
Also, it is guided by the upper guide 45 and is sent to a roller pair of the transport roller 36 and the pinch roller 37. At this time, the PE sensor lever 41 detects the leading edge of the conveyed sheet material P, and thereby obtains the printing position of the sheet material P. The sheet material P is the LF motor 47 (see FIG. 1).
As a result, the roller pair 36, 37 is rotated to be conveyed on the platen 46.

As the recording head 49, an easily replaceable ink jet recording head having an electric exchanger (not shown) integrally formed with the ink tank is used. The recording head 49 is capable of applying heat to the ink by an electric exchanger. The heat causes the ink to cause film boiling, and the pressure change caused by the growth or contraction of bubbles due to the film boiling causes ink to be ejected from the ejection port (not shown) of the recording head 49 to form an image on the sheet material P. It

(C) Carriage Section The carriage section 15 (see FIG. 1) has a carriage 50 to which the recording head 49 is attached. The carriage 50 holds a guide shaft 51 for reciprocating scanning in a direction perpendicular to the conveyance direction of the sheet material P and a guide 52 for holding a rear end of the carriage 50 to maintain a gap between the recording head 49 and the sheet material P. Supported by. The guide shaft 51 and the guide 52 are attached to the housing 3. Further, the carriage 50 is driven via a timing belt 55 by a carriage motor 53 arranged on the lower side (lower left in FIG. 1) of the housing 3. The timing belt 55 is supported by an idle pulley 56 that stretches the timing belt 55. The carriage 50 also includes a flexible board 57 for transmitting a head drive signal from the electric board 70 to the recording head 49.

In the above structure, when an image is formed on the sheet material P, the roller pairs 36 and 37 convey the sheet material P to the row position (position in the conveying direction of the sheet material P) for image formation, and the carriage motor 53 causes the sheet material P to move. The carriage 50 is moved to a column position for image formation (a position perpendicular to the sheet material P conveyance direction), and the recording head 49 is opposed to the image formation position. After that, the recording head 49 discharges ink toward the sheet material P in response to a signal from the electric substrate 70, and an image is formed.

(D) Paper Discharging Section (Mainly Refer to FIG. 2) The paper discharging section 13 is provided with the transmission roller 60 in contact with the conveying roller 36. Further, the transmission roller 60 contacts the paper discharge roller 59, and the paper discharge roller 59 has a spur 61.
Are provided in contact with each other, and the paper discharge roller 59 and the spur 61 form a roller pair. Further, a sheet discharge tray 62 (see FIG. 1) is provided in the sheet discharge direction of the sheet discharge roller 59. The discharge roller 59 has
The driving force of the transport roller 36 is transmitted by the transmission roller 60. Further, the spur 61 is provided with a paper discharge roller 59
It is possible to follow and rotate.

With the above structure, the sheet material P on which the image is formed by the carriage portion 15 is sandwiched and conveyed by the nip portion between the discharge roller 59 and the spur 61, and is conveyed to the discharge tray 6.
It is discharged to 2.

(E) Cleaning Section The cleaning section 16 (see FIG. 16) is a recording head 49.
And a drive switching arm 66 for switching the drive force from the cap 65 for suppressing the drying of the recording head 49 and the conveyance roller 36 to the sheet feeding unit 11 and the pump 63. When the cleaning is not performed, the drive switching arm 66 is at the position shown in FIG. 1, and the planetary gear (not shown) that rotates around the axis of the transport roller 36 is fixed at a predetermined position. Further, when the drive switching arm 66 is moved in the direction of arrow A by moving the carriage 50, the planet gears move in accordance with the forward and reverse rotations of the transport roller 36, and when the transport roller 36 is forwardly rotated, the paper feed is performed. When the driving force is transmitted to the section and the conveying roller 36 is rotating in the reverse direction, the pump 6
The driving force is transmitted to 3.

The above structure will be described in more detail (mainly with reference to FIGS. 1 and 4 to 6). First, when the drive switching arm 66 of the cleaning unit 16 is moved by the carriage 50 in the direction of the arrow A and the transport roller 36 is normally rotated,
It said that the planet gears move. As a result, the planet gear meshes with the input gear 25, and the idler gears 26, 27
The feed rotary body gear 2 coupled to the feed rotary body 5 via
The driving force is transmitted to 8, and the feeding rotating body 5 rotates. Further, the feeding rotary body gear 28 transmits the driving force to the release cam 31 via the clutch gear 29 and the idler gear 30. At this time, the feeding rotary member 5 and the release cam 31 are configured so that the phases of each rotation match, and in the standby state as shown in FIGS. 4 and 5, the half-moon portion (the fan angle is approximately The feeding rotary body 5 having a rotation angle of 120 ° faces the sheet material P without abutting on the sheet material P, and the feeding rotary body 5 is 200 g to 50 g at the time of sheet feeding.
The sheet material P is brought into contact with the contact force of 0 g. In addition, the release cam 31 pushes down the push-down portion 21c to push down the pressure plate 2
Put 1 in the standby state. At this time, the pressure plate cam 76 attached to the base 20 pushes down the cam 21c provided on the pressure plate 21. The cam 21c pushes down the pressure plate cam 7b. Since the pressure plate cam 76 is rotatable about the center 76b, even if the push-down portion 21c is lowered,
The pressure plate 21 does not tilt with respect to the base 20 and is always maintained in a substantially parallel state.

A clutch spring 77 is provided inside the clutch gear 29 (see FIG. 3), and the arrow B direction (see FIG. 5) corresponds to the tightening direction of the clutch spring 77. The clutch spring 77 does not rotate in the reverse direction. As a result, when performing registration or the like, the feeding rotating body 5 abuts on the sheet material P and does not rotate, so that good registration can be performed.

Further, as described above, the separating claw 17 has the rotating portion 1
It is possible to rotate around 7b, and it is possible to urge the sheet material P or the pressure plate 21 with a force of 20 g to 100 g by the claw spring 32. The separating claw 17 separates the sheet material P when the sheet material P such as plain paper is fed, and is provided only on the paper reference PKO side as shown in FIG. The shape is such that the corners are covered with a triangle (see, for example, FIG. 7). The sheet materials P can be separated one by one by receiving resistance in the triangular portion. Further, a pawl slide spring 35 (see FIGS. 7 and 8) is provided on the rotating portion 17b of the separation pawl 17, and the rotating portion 1b is provided.
The separation claw 17 is urged so as to push the separation claw 17 out of the 7b (for example, on the right side in FIG. 8). Further, the release cam 31 is provided with a pawl cam 31b for rotating the separation pawl 17 (for example, in the front-back direction with respect to the paper surface in FIG. 8) except when the pressure plate 21 is in the standby state.

The operation lever 33 is provided in two positions, a plain paper feed position and a thick paper feed position.
It is possible to take one position (see FIG. 4), and each position is arranged at an angular interval of about 20 ° to 50 °. Therefore, the operations of and will be described below.

When the plain paper feed position operation lever 33 is moved to the position of the plain paper feed position (in FIG. 8, the operation lever is pushed toward the back side of the paper to change the state of FIG. 8 to the state of FIG. 7). The cam 33b that is interlocked with the operation lever 33 rotates to push the separation claw 17 in the axial direction (direction C in FIG. 7). As a result, the tip portion 23 of the separation claw 17 comes into contact with the tip corner portion of the sheet material P. In this state, the pressure plate 21
In the standby state in which is pressed down, the separation claw 17 is rotated by the claw cam 31b, and the tip portion 23 of the separation claw 17 moves upward (toward the front side in FIG. 7). Therefore, the separating claw 17 is separated from the sheet material P. Thus, in the standby state, the sheet material P may simply be placed on the sheet material stacking means, and the operation of releasing the contact between the separation claw 17 and the sheet material P is not necessary.

In the standby state described above, when the feeding rotary member 5 rotates to start feeding, the driving force is transmitted to the release cam 31 to start the rotation and the contact between the release cam 31 and the pushing-up portion 21 is started. It is released and the standby state is released. As a result, the sheet material P comes into contact with the feeding rotating body 5. At this time, the claw cam 31b that has lifted the separation claw 17 upward also rotates together, so that the separation claw 17 contacts the sheet material P and the sheet materials P can be separated and fed one by one. .

When the thick paper feed position operation lever 33 is set to the position of the thick paper feed position, the cam 33b is rotated and the separation claw 17 is pushed out by the claw slide spring 35 in the direction of coming off the shaft (state of FIG. 7). From the state of FIG. 8). In this position, since the separation claw 17 is in a position where the claw cam 31b of the release cam 31 does not work, the separation claw 17 is urged against the pressure plate 21 by the action of the claw spring 32 (see FIG. 6). In addition, the convex portion 21 is provided above the portion of the pressure plate 21 with which the separation claw 17 abuts.
d (see FIGS. 2, 4, and 6) is provided, and when the thick sheet material P is placed, the separation claw 17 is inside (in the sheet material P width direction, for example, the back side of the paper surface in FIG. 2). It is configured so as not to get inside. Therefore, when feeding the thick sheet material P, the separation claw 17 is not biased to the sheet material P and is in contact with the lower guide portion 20b of the base 20. Further, since the separating claw 17 does not act during the sheet feeding, the sheet is separated and fed one by one by utilizing the resistance between the separating pad 73 provided on the lower side of the pressure plate 21 and the sheet material P.

When manually feeding one sheet at a time,
It is performed at the cardboard feed position. In the state of the thick paper feed position, the sheet material P for manual feeding is as it is.
May be inserted up to the roller pair of the pinch roller 37 and the conveying roller 36. As a result, the sheet material P crosses the PE sensor lever 41, and the PE sensor 42 is turned on.
become. Then, after a predetermined time of 1 to 2 seconds, the operation of aligning the leading end lengths of the sheet material P is started, and the state of waiting for a print signal is entered.

At the plain paper feed position where plain paper is set, the sheet material P will be caught by the separating claw 17 if manual feeding is performed as it is. Therefore, the separating claw 17 should be biased to the pressure plate 21 at the thick paper feeding position. By eliminating the clogging, there is an advantage in use and design such that the manual feed sheet material can be easily fed and there is no need to provide a paper feed port dedicated to the manual feed sheet.

In some cases, the leading edge of the sheet material P has reached the lower guide portion 20b with respect to the pressure plate 21 in the standby state. In this state, the operation lever 3
When 3 is switched from the plain paper feed position to the thick paper feed position to urge the separation claw 17 against the pressure plate 21, the corner of the sheet material P is lost by the urging force of the separation claw 17 and deformation occurs. This is particularly remarkable when the number of sheet materials P is small. In such a state, when the amount of the separation claw 17 applied to the sheet material P is an amount (3 to 5 [mm]) assuming a large number of sheet materials, the separation claw 17 comes off from the sheet material P. However, the separation claw 17 does not function and a paper feed failure such as a double feed occurs. Therefore, in the present embodiment, the tip end of the separation claw 17 is made swingable by making the rotating shaft of the separation claw 17 into a taper shape, and the guide portions 20c and 20d are provided on the base 20 (see FIGS. 9 and 11). Is provided so that the amount applied to the sheet material P is set to 8 to 10 [mm]. This prevents the separation claw 17 from coming off the sheet material P. This taper shape is composed of a reference circular hole 17c and a taper hole connecting the elongated hole 17d (see FIG. 11). With the long hole 17d,
The swinging direction is regulated, and it is possible to prevent double feeding and the like during separation.

The above-described gear group (excluding the feeding rotary member shaft 79), the separating claw 17, the operating lever 31 and the like are the base 20.
It is provided on a shaft installed on the right side plate of, and is configured to be rotatable around the shaft.

<Second Embodiment> FIG. 1 shows a second embodiment of the present invention.
A description will be given along line 2. Since the recording apparatus having the automatic paper feeding function in the first embodiment is substantially the same as that in the first embodiment, the same reference numerals are given and only different points will be described.

In the first embodiment described above, when the operation lever 33 selects the plain paper feed position, the cam 33b provided on the operation lever 33 pushes the separating claw 17 in the axial direction while rotating and releases the separation claw 17. The cam 31 moves to a position where the pawl cam 31b acts. Then, when the pressure plate 21 is in the standby state, the separation claw 17 moves the claw cam 31.
It is configured to be moved upward by b.

However, in this embodiment, as shown in FIG. 12, the movable range of the separation claw 17 is regulated by the stopper 33c provided on the operation lever 33. The operation lever 33 moves to the plain paper feed position (in FIG. 12, the operation lever 3
3 '), the stopper 33c largely separates from the end of the separation claw 17, so that the tip 23 of the separation claw 17 moves toward the pressure plate 21 by the urging force of the claw spring 32. In FIG. 12, the operation lever 3
3 ''), the stopper 33c regulates the position of the end of the separation claw 17 so that the tip 23 of the separation claw 17 is pressed against the pressure plate 21.
(The separation claw in this state is represented by 17 'in FIG. 12). As a result, the operation lever 33 and the separation claw 17 are interlocked with each other, and the separation claw 17 does not interfere even when the thick sheet material P is fed.

Therefore, the second embodiment has an advantage over the first embodiment described above in that the pawl cam 31b of the release cam 31, the pawl slide spring 35 and the like are unnecessary.

<Third Embodiment> FIG. 1 shows a third embodiment of the present invention.
A description will be given along with item 3. Since the recording apparatus having the automatic paper feeding function in the first embodiment is substantially the same as that in the first embodiment, the same reference numerals are given and only different points will be described.

In the above-described first embodiment, when the operation lever selects the thick paper feed position, the separation claw 17
Is urged by the pressure plate 21, and the convex portion 21d is located above the separation claw 17.
Is provided, when a thick sheet material P is placed,
The separation claw 17 is configured not to enter the sheet material P direction.

However, in the present embodiment, as shown in FIG. 13, a concave portion 21e is provided at a corner portion of the pressure plate 21, and the separating pawl 17 is allowed to escape there, so that the separating pawl 17 is removed when a thick sheet material P is placed. The sheet material P does not enter the direction of the sheet material P. In this case, there is an advantage that the stacking amount of the sheet material P can be increased as much as the convex portion is eliminated.

<Fourth Embodiment> FIG. 1 shows a fourth embodiment of the present invention.
It will be described with reference to FIGS. Since the recording apparatus having the automatic paper feeding function in the first embodiment is substantially the same as that in the first embodiment, the same reference numerals are given and only different points will be described.

In the first embodiment described above, the separation claw 17 is provided by the cam 33b provided on the operation lever 33.
Is moved to a position where it does not interact with the pawl cam 31b of the release cam 31, but in the present embodiment, a pawl cam 31c movable only in the axial direction of the release cam 31 is provided as shown in FIGS. The cam 31c is moved to separate the claw 17
It was configured to work with. Hereinafter, this configuration will be specifically described.

The pawl cam 31c is movable only in the axial direction of the release cam 31, and is configured to be urged against the inner wall of the operating lever 33 by the spring 31d. At this time, the cam phase of the release cam 31 and the claw cam 31c is set to a predetermined position, and the separation claw 17 and the pressure plate 21 are configured to be released at the same timing. 14 and 1
Reference numeral 5 indicates the state of the thick paper feed position, and the claw cam 31
Since c is biased to the outside (right side in FIG. 14) by the spring 31d, the pawl cam 31c does not act on the separation pawl 17. 16 and 17 show the state of the plain paper feed position, in which the disc of the claw cam 31c is pushed by the cam 33b of the operation lever 33 and enters the inside (left side in FIG. 16). As a result, the pawl cam 31c acts on the separation pawl 17.

In this structure, the release lever 33
The switching position is reversed from that in the first embodiment (the plain paper position and the thick paper position in FIG. 4 are reversed). The action of the pawl cam 31c on the separation pawl 17 and other aspects are exactly the same as in the first embodiment.

<Fifth Embodiment> FIG. 1 shows a fifth embodiment of the present invention.
A description will be given along line 8. Since the recording apparatus having the automatic paper feeding function in the first embodiment is substantially the same as that in the first embodiment, the same reference numerals are given and only different points will be described.

In the above-described first embodiment, the operation lever 33 indicating the sheet feeding position has two positions, but it may have three positions as shown in FIG. In this case, the release cam 31 is divided into a first release cam 31d that pushes down only the pressure plate 21 and a second release cam 31c that pushes down the pressure plate 21 and the claw 17, and each of them acts independently.

The second release cam 31c is provided coaxially with the first release cam 31d. The operation lever 33 and the second release cam 31c are independent of the first release cam 31d and are independent of each other so that the user can set the sheet material P. Also,
The operation lever 33 and the second release cam 31c are connected by a gear.

Further, the operation lever 33 has three positions of a feed position, a thick paper setting position and a plain paper setting position, and each position is provided at an angular position interval of about 20 ° to 50 °. Corresponding to the three positions of this operating lever 33,
The mutual gear ratios are set so that the release cam 35 rotates by about 90 °.

At the feed position of, the second position
The release cam 31c does not work on the push-down portion 21c of the pressure plate 21 and the push-down portion 17c of the separation claw 17. It is in this position during normal paper feeding.

In the thick paper setting position, the second release cam 31c pushes down the pressing plate 21c of the pressure plate 21.
By pushing down only the separation claw 17, the separation claw 17 is lowered along the pressure plate 21, and a thick paper setting without the separation claw 17 on the sheet material P can be performed. Manual feeding is also performed at this position.

At the plain paper setting position of
The second release cam 31c pushes down the pressing plate 21 of the pressure plate 21.
Since both the c and the push-down portion 17c of the separating claw 17 are pushed down and the separating claw 17 is raised with respect to the pressure plate 21, it is possible to perform plain paper setting in which the separating claw 17 is applied to the sheet material P. Further, although the tension coil spring is used as the claw spring 32, a compression coil spring may be used.

In the case of the above configuration, the separating claw 17 is always biased to the sheet material P at the feeding position of, so that the sheet material P is easily separated from the separating claw 17. Therefore, when the pressure plate 21 is released, the separation claw 17
There is an advantage that the effect of increasing the amount of work can be fully utilized.

<Sixth Embodiment> A sixth embodiment of the present invention is shown in FIG.
9 and FIG. 20. Since the recording apparatus according to the first embodiment is substantially the same as that according to the first embodiment, the same reference numerals are given and only different points will be described.

In the first embodiment described above, the separating claw 1
Although the movement of 7 is regulated by the guides 20c and 20d, in the present embodiment, as shown in FIGS. 19 and 20, the claw spring 32 is slanted to apply a force F in the arrow direction to the guide 20d. I made it a contact structure. In this case, there is an advantage that there is no play and the claw can be moved stably.

[0061]

As described above, according to the present invention, the following effects can be obtained.

(1) In the standby state, it is possible to increase the hanging amount when the separating claw comes into contact with the sheet material, and the separating claw does not come off from the sheet material even if the number of stacked sheet materials is small. . Further, when feeding, the separation claw has a smaller amount of engagement than during standby, so that stable and good separation can be performed, and the reliability of the apparatus is improved.

(2) The taper hole has a shape in which a round hole and a long hole are connected to each other, and by controlling the swing of the separating claw, it is possible to prevent the double feeding of the sheet material and the like, and the reliability of the apparatus is improved. did.

[Brief description of drawings]

FIG. 1 is a perspective view of a recording apparatus including a feeding apparatus applied to the description of Embodiments 1 to 6 of the invention.

FIG. 2 is a side view of a recording device including a feeding device applied to the description of Embodiments 1 to 6 of the invention.

FIG. 3 is a front view of a paper feeding unit in the feeding device applied to the description of the first to sixth embodiments of the present invention.

FIG. 4 is a side view of the feeding device applied to the description of the first embodiment of the present invention.

FIG. 5 is a side view of the feeding device applied to the description of the first embodiment of the present invention.

FIG. 6 is a side view of the feeding device applied to the description of the first embodiment of the present invention.

FIG. 7 is a side view of the switching unit in the feeding device applied to the description of the first embodiment of the present invention.

FIG. 8 is a side view of the switching means in the feeding device applied to the description of the first embodiment of the present invention.

FIG. 9 is a partial front view of the separation claw of the feeding device applied to the description of the first embodiment of the present invention.

FIG. 10 is a side view of the switching means in the feeding device applied to the description of the first embodiment of the present invention.

FIG. 11 is a partial view of the separation claw of the feeding device applied to the description of the first embodiment of the present invention, in which (a) is a side view and (b) a front view.

FIG. 12 is a side view of a switching unit in the feeding device applied to the description of the second embodiment of the present invention.

FIG. 13 is a side view of a switching unit in the feeding device applied to the description of the third embodiment of the present invention.

FIG. 14 is a side view of a switching unit in the feeding device applied to the description of the fourth embodiment of the present invention.

FIG. 15 is a partial side view of the switching means in the feeding device applied to the description of the fourth embodiment of the present invention.

FIG. 16 is a side view of a switching unit in the feeding device applied to the description of the fourth embodiment of the present invention.

FIG. 17 is a partial side view of the switching means in the feeding device applied to the description of the fourth embodiment of the present invention.

FIG. 18 is a side view of a switching unit in the feeding device applied to the description of the fifth embodiment of the present invention.

FIG. 19 is a partial front view of the separating means in the feeding device applied to the description of the sixth embodiment of the present invention.

FIG. 20 is a side view of a switching unit in the feeding device applied to the description of the sixth embodiment of the present invention.

FIG. 21 is a side view of a recording device including a feeding device that is applied to explain problems of the conventional technique.

[Explanation of symbols]

5 feeding rotary body 17 separate nails 17b Rotating part 17c Round hole 17d long hole 20c, 20d guide 21 Pressure plate 21c Depressing part 21d convex part 21e recess 31 release cam 31b Claw cam 31c claw cam 31d spring 32 claw spring 33 Control lever 33b cam 33c stopper 72 Pressure leaf spring P sheet material

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Kinoshita 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hideaki Kawakami 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (72) Inventor Takashi Nojima 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Masahiro Taniguro 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Satoshi Sakawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Soichi Hiramatsu 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Junichi Asano 3-30-2 Shimomaruko, Ota-ku, Tokyo, Canon Inc. (56) References: Showa 63-32845 (JP, U) Showahei 3-59941 ( P, U) Actual opening Sho 64-12031 (JP, U) Actual opening 1-72515 (JP, U) Actual opening 3-31140 (JP, U) Actual opening 1-85340 (JP, U) (58 ) Fields surveyed (Int.Cl. ⁷ , DB name) B65H 3/56

Claims (12)

(57) [Claims] 1. A support means for rotatably supporting a sheet stacking means for stacking sheet materials, a feeding rotary body for feeding the sheet materials stacked on the sheet stacking means, and the feeding rotary body. When feeding the sheet material, the separation claw for preventing the double feeding of the sheet material, and the sheet material stacked on the sheet stacking means in association with the sheet material feeding operation of the feeding rotating body are fed. Rotating means for rotating the sheet stacking means so as to contact or separate from the rotating body; and rotating the sheet stacking means by the rotating means,
An automatic feeding device comprising: a unit that increases the amount of the separation claw that is applied to the sheet material when the stacked sheet materials are separated from the feeding rotating body. 2. The automatic feeding device according to claim 1, wherein the separating claw is provided at a tip corner portion of either one of the sheet materials stacked on the sheet stacking means. 3. The automatic feeding according to claim 1, wherein a shaft hole of a rotating shaft that is rotatable so that the separation claw comes in contact with or retracts from the sheet stacking means is a tapered hole. apparatus. 4. The automatic feeding device according to claim 3, wherein the tapered hole is a tapered hole that connects a round hole and an elongated hole. 5. The means for increasing the engagement amount of the separation claw includes a guide member provided on the support means and a biasing member for biasing the separation claw. The automatic feeding device described. 6. The automatic feeding device according to claim 1, wherein the separation claw is retracted from the sheet stacking unit in a standby state where a sheet material is not fed. 7. The automatic feeding according to claim 1, wherein the rotating means has a separating claw rotating portion for rotating the separating claw so as to contact with or retract the sheet stacking means. apparatus. 8. The automatic feeding according to claim 1, wherein the supporting unit has a sheet stacking unit urging member that urges the sheet stacking unit in the direction of the sheet feeding rotating body. apparatus. 9. The rotating means separates the sheet stacking means from the feeding rotary member against the sheet stacking means urging member by contacting a release member provided in the sheet stacking means. The automatic feeding device according to claim 8, wherein 10. The automatic feeding device according to claim 1, wherein the rotating means is a cam, and is rotated by transmitting a driving force for rotating the feeding rotating body. 11. The feeding rotary member is a half-moon shaped feeding roller having a cutout portion, and the cutout portion is held facing the sheet stacking means in a state where the sheet material is not fed. The automatic feeding device according to claim 1, wherein 12. An automatic feeding device according to claim 1, and a recording means for recording on a sheet material fed from the automatic feeding device. Recording device.