JPH1035897A - Paper feeding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feeding equipment capable of setting an original at the lowest position in a most advanced condition when a tip of the original is inserted between a paper feed roller and a separation piece, and set. SOLUTION: A movable guide 11 having an original supporting face 11a on its upper surface is turnably provided on the upstream side of a paper feed roller 3 in the vicinity of a lower end of an original table 2, and the movable guide 11 is projected upwardly from the original table 2 so that the lowest original 1 is not brought into contact with an outer circumferential surface of the paper feed roller 3. Interference of the paper feed roller is prevented in setting the original, and the tip of the original is set so as to be in the shape where the lowest original is most advanced, the movable guide 11 is evacuated below the original table 2 in feeding the paper, and the original is loaded on the paper feed roller 3 to perform the ordinary paper feed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device for separating and feeding a plurality of documents set on a document table in a stacked state one by one in a facsimile or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 11 and 12, an apparatus of this type includes an original table 2 for setting a plurality of originals 1 and a sheet feeder arranged at a lower end position of the original table 2. Roller 3, a separating piece 4 made of a rubber plate or the like pressed against the paper feeding roller 3 to prevent double feeding of originals, a holder 5 holding the separating piece 4 and supporting the back surface, and a separating piece 4;
11 is provided with a pressing spring (not shown) for pressing the vicinity of the lower end of the sheet feeding roller 3 as shown by arrow F.
As shown in (a), the set original 1 is pulled out from the lowermost portion and fed out one by one. here,
The document table 2 is usually formed integrally with a document guide 7 for guiding the document fed by the sheet feeding roller 3. The sheet feeding roller 3 is formed through a hole 8 formed in the center of the lower end region of the document table 2. , So that its outer peripheral surface slightly protrudes.

[0003]

However, in such a conventional configuration, since the outer peripheral surface of the paper feed roller 3 protrudes slightly above the upper surface of the document table 2, a bundle of a plurality of documents 1 is set. In this case, as shown in FIG. 11B, of the plurality of originals 1, the lower original abuts against the outer peripheral surface of the paper feed roller 3 and is prevented from advancing, so that the central original protrudes first. It is often set in such a shape. Then, if paper feeding is started in this state, it is difficult to pull out the lowermost document, which causes a problem that paper feeding failure occurs eventually.

In setting a bundle of documents, if the operator pushes the bundle of documents strongly, the leading edge of the document is strongly inserted between the paper feed roller 3 and the separating piece 4, and the bundle of documents is The paper is strongly sandwiched from above and below by the paper feed roller 3 and the separating piece 4, and a state in which a large pressing force is applied is obtained.
Then, if the feeding is started in this state, a large frictional force is generated between the originals, the separation is not performed smoothly, and there is a problem that the feeding failure is likely to occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and when setting a bundle of originals, the original can be easily set in a shape such that the lowermost original is first. An object of the present invention is to provide a sheet feeding device that is less likely to cause a sheet feeding failure.

Further, according to the present invention, when a bundle of originals is set, even if the originals are strongly pressed, an excessive pressing force on the bundle of originals is released at the time of paper feeding, thereby enabling good paper feeding. It is an object to provide a paper feeding device.

[0007]

In order to solve the above-mentioned problems, the present invention has a document supporting surface on the upper surface at a position upstream of a paper feed roller and at a position capable of supporting a document set on a document table. A movable guide is provided, and the movable guide is retracted to a retracted position lower than the upper surface of the document table during paper feeding by the paper supply roller, and when the paper supply roller is on standby, the document support surface is higher than the upper surface of the document table. , And the operating position is such that the leading end of the supported document is located upward away from the outer peripheral surface of the paper feed roller. With this configuration, when the operator sets an original, the movable guide supports the inserted original above the outer peripheral surface of the paper feed roller, whereby the lowermost original abuts against the outer peripheral surface of the paper feed roller. The original can be easily set in a state suitable for feeding without being prevented from moving forward.

According to another aspect of the present invention, a movable guide is provided upstream of the paper feed roller and at a position capable of supporting a document set on a document table. A document supporting surface extending along both sides of the document table is formed, and its movable guide is retracted to a retracted position lower than the upper surface of the document table during sheet feeding by the sheet feeding roller. The document support surface is located above the upper surface of the document table, and the operating position is such that the leading end of the supported document is located upward away from the outer peripheral surface of the paper feed roller. With this configuration, when the operator sets an original, the movable guide supports the inserted original above the outer peripheral surface of the paper feed roller, whereby the lowermost original abuts against the outer peripheral surface of the paper feed roller. Thus, the original can be easily set in a state suitable for feeding without being prevented from moving forward. Also, when the document is pushed in strongly, the leading edge of the document is strongly sandwiched between the separating piece and the document support surfaces on both sides of the paper feed roller, and receives an excessive pressing force. Since the document support surface of the movable guide is lowered, an excessive pressing force by the separation piece and the document support surface is reduced, and excellent paper feeding is possible.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, there is provided a document table on which a plurality of documents are set, a sheet feeding roller disposed at a lower end position of the document table, and a sheet roller pressed against the sheet feeding roller. A document supporting surface is formed on the upper surface of a paper feed roller provided with a separation piece for preventing double feeding of a document, at a position upstream of the paper feed roller and at a position where the document set on the document table can be supported. A movable guide is provided, and the movable guide is
At the time of paper feeding by the paper feed roller, it is retracted to a retracted position lower than the original on the document table, but when the paper feed roller is on standby, the document support surface is located above the upper surface of the document table. In this case, the leading end of the supported document is moved to an operation position where the leading end of the document can be moved upward from the outer peripheral surface of the paper feed roller.

In the paper feeder having the above-described configuration, the document support surface of the movable guide is located above the upper surface of the document table during standby when the paper feed roller is stopped. When the bundle is set on the platen, the lower surface of the bundle of documents is supported by the document support surface of the movable guide, and the leading end of the bundle of documents is inserted between the paper feed roller and the separating piece. At this time, the document is inserted until the leading edge of the document hits the separation piece without the leading edge of the document hitting the outer peripheral surface of the paper feed roller and being stopped. Thus, the bundle of originals is set in a shape in which the lowermost original is the most advanced, and the movable guide is lowered during paper feeding, so that the original bundle is placed on the paper feed roller in that state, and the lowermost of the original is A state in which paper is fed from the printer can be reliably produced, and excellent paper feeding can be realized.

According to a second aspect of the present invention, there is provided a document table for setting a plurality of documents, a paper feed roller disposed at a lower end position of the document table,
A movable guide is provided at a position upstream of the paper feed roller and at a position capable of supporting the original set on the original table in a paper feed roller provided with a separating piece for preventing double feeding of the original, A configuration having a document supporting surface extending along both sides of the paper feed roller, and further, a movable guide thereof,
When the paper feed roller feeds paper, it is retracted to a retracted position lower than the original on the platen, but when the paper feed roller stands by, it is located above the upper surface of the platen, and the document support surface Is moved to an operating position in which the leading end of the document held in step (1) is separated upward from the outer peripheral surface of the paper feed roller.

In the paper feeder having the above-described configuration, the document support surface of the movable guide is located above the upper surface of the document table during standby when the paper feed roller is stopped. When the bundle is set on the platen, the lower surface of the bundle of documents is supported by the document support surface of the movable guide, and the leading end of the bundle of documents is inserted between the paper feed roller and the separating piece. At this time, the document is inserted until the leading edge of the document hits the separation piece without the leading edge of the document hitting the outer peripheral surface of the paper feed roller and being stopped. Thus, the bundle of originals is set in a shape in which the lowermost original is the most advanced, and the movable guide is lowered during paper feeding, so that the original bundle is placed on the paper feed roller in that state, and the lowermost of the original is A state in which paper is fed from the printer can be reliably produced, and excellent paper feeding can be realized. Moreover, even if the operator presses the document strongly when inserting the bundle of documents, the leading end of the document is strongly sandwiched between the separating piece and the document supporting surfaces on both sides of the sheet feeding roller. By lowering the document support surface of the movable guide, an excessive pressing force applied to the document is reduced, and excellent paper feeding becomes possible.

According to a third aspect of the present invention, in the first or second aspect of the invention, the movable guide is provided rotatably about an axis parallel to the axis of the paper feed roller, and the movable guide is vertically moved. A movable guide operating mechanism for lifting the movable guide to an operating position by reverse rotation of a paper feed roller shaft and releasing lifting of the movable guide by forward rotation of the paper feed roller shaft. It is. When the movable guide is configured to be moved up and down by rotation as described above, the movable guide can be smoothly and stably moved up and down while being supported by a simple support structure, and the paper feed roller When the forward and reverse rotation of the shaft is used, a drive source dedicated to the movable guide is not required, and the apparatus can be simplified.

According to a fourth aspect of the present invention, the movable guide operating mechanism is a coil spring-shaped movable guide operating spring wound on a cylindrical surface which rotates integrally with a sheet feeding roller shaft, and one end of the sheet feeding mechanism is provided. A movable guide operating spring extending in the reverse rotation direction of the roller shaft and forming a smoothly curved movable guide pushing upper end, and the other end forming a stopper end extending in the forward rotation direction of the paper feed roller shaft; When the paper feed roller shaft rotates in the reverse direction and the movable guide push upper end of the movable guide operation spring rotates with it, the movable guide push spring contacts the movable guide push upper end and is pushed up to a predetermined height. A support surface, a stopper surface formed adjacent to the supported surface, and for preventing further rotation of the movable guide pushing upper end;
After the paper feed roller shaft rotates forward and the movable guide push upper end is separated from the supported surface of the movable guide, a stopper end of the movable guide operation spring abuts and is provided at a fixed position so as to prevent rotation. And a stopper member provided.

In the movable guide operating mechanism having the above structure, when the feed roller shaft rotates in the reverse direction, the movable guide operating spring also rotates together with the movable guide pushing upper end, and enters the movable guide under the supported surface of the movable guide. Is lifted, and stops at that position when it hits the stopper surface. At this time,
Since the direction of rotation of the feed roller shaft is the direction of loosening of the movable guide operation spring, there is no problem even if the feed roller shaft continues to rotate, and the feed roller shaft stops rotating after continuing to rotate appropriately. . In this manner, the paper feed roller shaft is appropriately reversely rotated by an amount equal to or more than the rotation amount at which the movable guide operating upper end of the movable guide operating spring abuts against the stopper surface of the movable guide, so that the movable guide is maintained at a constant height at the movable guide operating upper end. Lift,
Can be held. Next, when the paper feed roller shaft rotates forward for paper feeding, the rotating direction at that time is the direction of the closing of the movable guide operation spring, so that the movable guide operation spring rotates forward with the paper feed roller shaft and moves The upper end of the movable guide that has pushed up the guide rotates downward and moves to a position that allows the movable guide to descend. Then, at an appropriate time after the movable guide has descended to the predetermined retracted position, the stopper end of the movable guide operation spring abuts against the stopper member, and further rotation is prevented. At this time, since the rotation direction of the feed roller shaft is in the direction of slack with respect to the movable guide operation spring, the feed roller shaft can continue to rotate without hindrance with the movable guide operation spring stopped. Paper operation can be performed.

According to a fifth aspect of the present invention, a transmission means is provided between the paper feed roller shaft and the paper feed roller to transmit the paper feed roller to the paper feed roller by delaying the forward rotation of the paper feed roller. When the movable guide operating mechanism raises the movable guide to the operating position, the paper feed roller shaft starts to rotate forward, and the forward rotation of the paper feed roller shaft lowers the movable guide. After the document supported on the paper feed roller is placed on the paper feed roller, the forward rotation of the paper feed roller shaft is transmitted to the paper feed roller. With this configuration, even when the paper feed roller shaft starts to rotate forward during paper feeding, the paper feed roller actually starts rotating because the movable guide is sufficiently lowered and is supported thereon. Since the recording paper is placed on the paper feed roller, it is possible to prevent skewed paper feeding in which the document is skewed and fed, thereby achieving good paper feeding.

According to a sixth aspect of the present invention, there is provided a paper feed roller shaft with a transmission means for transmitting only the forward rotation of the paper feed roller shaft to the paper feed roller, and the transmission means is provided at a predetermined position of the paper feed roller shaft. A drive clip detachably attached to the D-cut portion, the drive clip having a substantially D-shaped inner surface shape corresponding to the D-cut portion and having an outer surface shape similar thereto, and A drive drum having a cylindrical through hole fitted and held and having a substantially D-shaped inner surface hole fitted at one end to the outer periphery of the drive clip, and provided rotatably with respect to the feed roller shaft And a spring for connecting the drive drum and the clutch drum so as to transmit only the forward rotation of the drive drum to the clutch drum. The roller is allowed to spin at a predetermined angle, but is thereafter connected so as to transmit the rotation. Further, a cylindrical surface is formed on the drive drum, and the movable guide operation spring is wound around the cylindrical surface and held. It is configured.

According to this configuration, only the D-cut portion is formed at one position of the feed roller shaft, and the drive drum is fixed at the fixed position and the feed roller is mounted on the D-cut portion by using a detachable drive clip. The movable guide can be held so as to rotate integrally with the shaft, and by holding the movable guide operation spring, the movable guide can be moved up and down by forward and reverse rotation of the paper feed roller shaft. The rotation can be transmitted to the paper feed roller via a spring and a clutch drum. In addition, at this time, since the clutch drum can idle at a predetermined angle with respect to the paper feed roller, the paper feed roller does not rotate at the beginning of the normal rotation of the paper feed roller shaft. After the paper feed roller shaft starts to rotate forward, the movable guide operation spring moves downward and the movable guide descends, and then the above-mentioned idle rotation angle is determined so that the rotation is transmitted to the paper feed roller. Thus, the rotation of the paper feed roller can be started after the recording paper is placed on the paper feed roller, and oblique paper feed can be prevented, and good paper feed can be achieved.

The configuration of the above-mentioned transmission means for transmitting the rotation from the feed roller shaft to the feed roller can be used not only for the feed device using the movable guide but also for a general feed device. The invention of claim 7 is characterized by this transmitting means. In other words, the invention according to claim 7 is provided with a transmission means for transmitting only the forward rotation of the paper supply roller shaft to the paper supply roller on the paper supply roller shaft, and the transmission means is provided at a predetermined position of the paper supply roller shaft. A drive clip detachably attached to the formed D-cut portion, the drive clip having a substantially D-shaped inner surface shape corresponding to the D-cut portion and having an outer surface shape similar thereto; A drive drum having a cylindrical through-hole to be held together and having at one end a substantially D-shaped inner surface-shaped hole fitted to the outer periphery of the drive clip; and a rotatably provided rotatable with respect to the feed roller shaft. Clutch drum, the drive drum and the clutch drum, a configuration provided with a spring that connects so as to transmit only the forward rotation of the drive drum to the clutch drum,
The clutch drum is connected so as to transmit rotation to the paper feed roller. With this configuration, the paper feed roller can be fed by being driven to rotate in the forward direction by the paper feed roller shaft, and the fed document is conveyed at a speed higher than the feed speed of the paper feed roller by the downstream feed roller. In such a case, the original can be pulled and run idle regardless of the rotation of the paper feed roller shaft, and the paper can be fed without any trouble. In mounting the transmission means, only a D-cut portion is formed at one position of the feed roller shaft, and the drive drum is set at a fixed position and the feed roller shaft is mounted using a detachable drive clip at the D-cut portion. And can be easily attached, and the entire structure of the transmission means can be simplified as compared with a conventionally used one-way clutch, and cost can be reduced.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention shown in the drawings will be described below. FIGS. 1A and 1B show a main part of a sheet feeding apparatus according to a first embodiment of the present invention. FIG. 1A is a schematic sectional view showing a state in which a document is set on a stopped sheet feeding roller. )
FIG. 2 is a schematic sectional view showing a state during paper feeding, FIG. 2 is a schematic perspective view of a main part of the paper feeding apparatus, and the same or similar parts as those in the conventional example shown in FIGS. ing.
1 and 2, reference numeral 1 denotes a document, reference numeral 2 denotes a document table on which a plurality of documents 1 are set, and reference numeral 3 denotes a part of an outer peripheral surface protruding from a hole 8A formed at a lower end position of the document table 2. The paper feed rollers 4 arranged so as to cause the paper feed rollers 3
, A separation plate made of a rubber plate or the like for preventing double feeding of originals, a holder 5 for holding the separation plate 4 and supporting the rear surface, and a integrally formed downstream of the original table 2 An original guide 9 for guiding the original fed by the roller 3 is a paper feed roller shaft holding the paper feed roller 3.

Here, the hole 8A formed in the document table 2
Is formed largely upstream of the paper feed roller 3 unlike the conventional one, and a movable guide 11 is disposed in the hole 8A. The movable guide 11 has a document support surface 11a on the upper surface capable of supporting a document and a support shaft 11b on both sides of an upper end, and the support shaft 11b is parallel to the axis of the paper feed roller 3 with respect to the document table 2. And the support shaft 11
It is held so as to be rotatable about b. Further, when the movable guide 11 is rotated downward, the movable guide 11 is mounted at a retreat position lower than the original 1 supported by the movable guide 11 on the original platen 2 as shown in FIG. When the movable guide 11 is rotated upward, at least a part of the document supporting surface 11a is located above the upper surface of the document table 2 as shown in FIG. The operating position is such that the leading end of the original 1 thus set can be positioned upward away from the outer peripheral surface of the paper feed roller 3. Further, although not shown, when the paper is fed by the paper feed roller 3, the movable guide 11 is
A movable guide operating mechanism for moving the movable guide 11 is provided so that the movable guide 11 moves to the retracted position shown in FIG. 1B and moves to the operating position shown in FIG. Have been. As the movable guide operating mechanism, a mechanism using the forward and reverse rotation of the paper feed roller shaft 9 is preferable as described later, but any other mechanism can be used. For example, a solenoid is used. One that moves the movable guide 11 up and down, one that moves the movable guide 11 up and down using a cam, and the like can be used. Further, the movable guide 11 is not limited to the configuration in which the movable guide 11 is necessarily moved to the operating position and the retracted position by rotating, but may be changed to a configuration in which the movable guide 11 simply moves linearly. However, it is preferable to adopt a configuration in which the movable guide 11 can be rotated around the support shaft 11b as in this embodiment, since the advantage of stably rotating the movable guide 11 with a simple support structure is obtained.

In the paper feeder having the above-described configuration, when the paper feed roller 3 is on standby, the movable guide 11 is in an operating position protruding above the upper surface of the document table 2 as shown in FIG. The document is set in this state. That is, the operator places the leading end of the bundle of documents 1 on the document table 2 and slides the document 1 between the sheet feed roller 3 and the separation piece 4 while sliding on the document table 2. At this time, since the lowermost surface of the leading end of the document 1 is guided by the document supporting surface 11a of the movable guide 11, the leading end of the lowermost document moves forward almost without contacting the outer peripheral surface of the paper feed roller 3, and Is stopped by contacting the separation piece 4. Thus, as shown in FIG. 1A, the bundle of originals 1 is set in a shape in which the lowermost original is the most advanced. Next, when paper is to be fed, FIG.
As shown in (b), the movable guide 11 is lowered, the leading end of the document 1 is placed on the outer peripheral surface of the paper feed roller 3, and the paper is fed by the paper feed roller 3. At this time, since the lowermost document to be pulled out is in the most advanced state, the paper feed roller 3 can apply a sufficient pulling force to the lowermost document and feed the document satisfactorily. As described above, good sheet feeding is always performed.

FIGS. 3 and 4 show another embodiment of the present invention and are similar to FIGS. 1 and 2. FIG. In this example,
A hole 8B formed in the document table 2 for projecting the paper feed roller 3 is enlarged not only on the upstream side of the paper feed roller 3 but also on both sides, and the movable guide 13 is disposed at that position. ing. The movable guide 13 has a document support surface 13 a extending along both sides of the paper feed roller 3, and has a support shaft 13 b on both sides at the upper end. And is rotatably held about its support shaft 13b. Further, similarly to the movable guide 11 shown in FIG. 1, the movable guide 13 also has the original support surface 1 as shown in FIG.
An operation position in which at least a part of the document feeder 3a is located above the upper surface of the document table 2 and the leading end of the document 1 supported by the document support surface 13a is located away from the outer peripheral surface of the paper feed roller 3; As shown in FIG. 3B, the movable guide 13 is provided so as to be movable to a retracted position lower than the original 1 on the original platen 2, and the movable guide 13 is moved to the operating position and the retracted position. A movable guide operation mechanism (not shown) is provided.

Also in this embodiment, when the paper feed roller 3 is on standby, the movable guide 13 is in the operating position shown in FIG. 3 (a). The lowermost document does not contact the outer peripheral surface of the feed roller 3 and is prevented from moving forward.
Are set in a shape in which the lowermost document is most advanced. At this time, since the original supporting surface 13a of the movable guide 13 extends to a position for supporting the leading end of the original abutting against the separation piece 4, the leading end of the original is surely supported. The document can be supported so as not to hit the paper feed roller 3, and the leading end of the document can always be set in a shape suitable for paper feeding. Next, when paper is fed, the movable guide 13 is lowered as shown in FIG. 3B, and the leading end of the document 1 is placed on the outer peripheral surface of the paper feed roller 3. Done. At this time, since the lowermost document to be pulled out is in the most advanced state, the paper feed roller 3 can apply a sufficient pulling force to the lowermost document, and can feed well.

Further, the embodiments shown in FIGS. 3 and 4 have the following advantages. That is, when the original is set, as shown in FIG.
In this case, the leading end of the document is strongly sandwiched between the movable guide 13 and the separating piece 4, and an excessive pressing force P acts on the document in the thickness direction. Of the movable guide 13 during paper feeding.
As shown in FIG. 5B, the excessive pressing force acting on the leading edge of the document can be reduced, and no trouble occurs in sheet feeding. If the movable guide 13 is not provided, if the document 1 is strongly pushed in in this manner, the leading edge of the document is strongly sandwiched between the paper feed roller 3 and the separating piece 4, and an excessive pressing force in the thickness direction is applied to the document. Paper feeding must be performed in the state where P acts, and a paper feeding failure is likely to occur. In this embodiment, this problem can be avoided.

FIG. 6 is a schematic perspective view of a main part showing still another embodiment of the present invention, FIG. 7 is a schematic perspective view showing a paper feed roller in the embodiment with a part cut away, and FIG. FIG. 9 is a schematic sectional view of the paper feed roller, FIG.
FIGS. 10A and 10B are schematic cross-sectional views showing portions indicated by arrows AA in FIG. 8 in different states. This embodiment is similar to the embodiment shown in FIGS.
The paper feed roller shaft 9 is used as a movable guide operating mechanism for moving the movable guide 13 up and down.
That uses forward and reverse rotation of The details will be described below.

The paper feed roller 3 is rotatably held with respect to a paper feed roller shaft 9, and the paper feed roller shaft 9 transmits only the forward rotation of the paper feed roller shaft to the paper feed roller. Means 15 are provided. The transmission means 15 includes a drive clip 16, a drive drum 17, a clutch drum 18, a spring 19, and the like.

The drive clip 16 has a partially cut-out shape so as to be detachable from a D-cut portion 9a formed at a predetermined position of the paper feed roller shaft 9, and has an inner surface shape. The paper feed roller shaft 9 has a substantially D-shape that matches the D-cut portion 9a, and the outer surface shape has a substantially D-shape similar thereto. Further, a flange 16a is formed at one end of the drive clip 16. The length of the drive clip 16 is determined to be equal to the D-cut portion 9a of the feed roller shaft 9, so that by attaching the drive clip 17 to the D-cut portion 9a, the drive clip 17 is connected to the feed roller shaft 9. 9 precisely and immovably. Normally, the drive clip 16 is made of a resin molded product, so that the cost can be reduced and the drive clip 16 can be easily deformed for attachment and detachment.

The drive drum 17 has a cylindrical through hole for fitting and holding the feed roller shaft 9, and has a substantially D-shaped inner surface hole 1 fitted at one end to the outer periphery of the drive clip 16.
7a. Accordingly, the drive drum 17 is passed through one end of the feed roller shaft 9 and the hole 17a at one end is fitted to the outer periphery of the drive clip 16 attached to the D cut portion 9a, thereby driving the drive drum 16 through the drive clip 16. The drum 17 can be fixed so as to rotate integrally with the paper feed roller shaft 9. Here, the drive clip 16 itself is easily deformed, and only the drive clip 16 is connected to the sheet feeding roller shaft 9.
If the drive clip 16 is opened to transmit the rotational force, the feed clip shaft 9 may open and the feed roller shaft 9 may run idle. However, in this embodiment, the drive drum 17 surrounds the outer periphery of the drive clip 16. Accordingly, the driving clip 16 does not open, so that the rotational force of the paper feed roller shaft 9 can be reliably transmitted to the driving drum 17 via the driving clip 16. The depth of the hole 17a at one end of the drive drum 17 is
The length of the drive clip 16 is set to be slightly smaller than the length of the outer peripheral surface of the drive clip 16. Therefore, the drive drum 1 is moved until the bottom surface of the hole 17 a comes into contact with the tip of the drive clip 16.
7, the drive drum 17 can be positioned at a predetermined position in the axial direction with respect to the paper feed roller shaft 9.

On the outer periphery of the drive drum 17, a first cylindrical surface 17b, a flange 17
c, the second cylindrical surface 17d, the smaller third cylindrical surface 17
e is formed. The clutch drum 18 has a hole 18 rotatably fitted to the third cylindrical surface 17e of the drive drum 17.
a, and is rotatably held by the third cylindrical surface 17e, and is therefore rotatably provided with respect to the paper feed roller shaft 9. Instead of rotatably holding the clutch drum 18 on the third cylindrical surface 17e of the drive drum 17, the drive drum 17 eliminates the third cylindrical surface 17e, and the clutch drum 18 is directly rotatable on the feed roller shaft 9. It may be configured to hold. However, when the clutch drum 18 is rotatably held on the third cylindrical surface 17e of the drive drum 17 as in the present embodiment, an advantage that the assembling work becomes easy is obtained, which is preferable. The clutch drum 18 has a cylindrical surface 18b and a flange 18c on the outer periphery. The cylindrical surface 18b has the same outer diameter as the second cylindrical surface 17d of the drive drum 17. The sprink 19 is dimensioned to be lightly wound around the second cylindrical surface 17d of the drive drum 17 and the cylindrical surface 18b of the clutch drum 18, and has a length equal to the third cylindrical surface 17e of the drive drum 17. When the clutch drum 18 is fitted to the predetermined position, the both ends of the spring 19 are determined to lightly contact the flanges 17c, 18c. Thus, the drive drum 17, the clutch drum 18, and the spring 19
The rotation of the drive drum 17 in only one direction is performed by the clutch drum 1.
8 to constitute a one-way clutch (spring clutch). Here, the mounting direction (winding direction) of the spring 19 is determined so that only the forward rotation of the drive drum 17 (the rotation direction when the paper feed roller 3 feeds the document) is transmitted to the clutch drum 18. ing.

At the end of the clutch drum 18, an arc-shaped projection 18d is formed. On the other hand, the paper feed roller 3 has a wall surface 3c against which the projection 18d abuts, and a part of the wall surface 3c has an arc-shaped projection 3d having the same radius as the projection 18d of the clutch drum 18. Thus, when the clutch drum 18 rotates, the side end of the projection 18d of the clutch drum 18 comes into contact with and presses the side end of the projection 3d of the paper feed roller 3, so that rotation can be transmitted. Here, the total length of the arc-shaped protrusion 3d and the protrusion 18d is:
The length is set shorter than the complete circumference, so that the clutch drum 18 and the paper feed roller 3 can idle at a certain angle. This idling angle will be described later. An annular groove 9c is formed near the end of the feed roller shaft 9, and a snap fit 20 is formed in the annular groove 9c.
Is detachably attached. This annular groove 9
The position c is determined so that the paper feed roller 3 can be positioned at a predetermined position in the axial direction with respect to the paper feed roller shaft 9 by the snap fit 20 attached thereto and can be prevented from coming off.

On the first cylindrical surface 17b of the drive drum 17,
The movable guide operation spring 22 in the form of a coil spring is attached while being lightly wound. Both ends of the movable guide operation spring 22 extend tangentially from the coil portion, and as can be clearly seen from FIG. 10, the sides extending in the reverse rotation direction (the direction of arrow B) of the paper feed roller shaft 9. The end 22a forms a smoothly curved movable guide pushing upper end, and the other end 22b extends in the forward rotation direction (the direction of arrow C) of the sheet feeding roller shaft 9 to form a stopper end. The movable guide 13 has a supported surface 13d on its lower surface,
A substantially perpendicular stopper surface 13e is formed thereon. The supported surface 13d is formed at a position where the movable guide pushing upper end 22a of the movable guide operating spring 22 is pushed up by the movable guide pushing upper end 22a when the movable guide operating spring 22 is rotated by the reverse rotation of the paper feed roller shaft 9, and the stopper surface is formed. 13e
Is provided at a position where when the movable guide 13 is pushed up to a predetermined height by the movable guide push upper end 22a, the movable guide push upper end 22a comes into contact with the movable guide push upper end 22a to prevent further rotation of the movable guide push upper end. I have. Thus, FIG.
When the feed roller shaft 9 stopped in the state shown in FIG. 0 (b) starts reverse rotation in the direction of arrow B, the movable guide push-up end 22a also rotates in the direction of arrow B, and the movable guide 1
3 enters under the supported surface 13d, pushes up the movable guide 13, and as shown in FIG. 10 (a), stops at the time when it hits the stopper surface 13e. On the other hand, although the paper feed roller shaft 9 continues to rotate, the rotation direction is the direction in which the movable guide operation spring 22 is loosened, so there is no problem. In this manner, the feed roller shaft 9 is moved to a predetermined position where the movable guide pressing upper end 22a abuts against the stopper surface 13e by rotating the movable guide pressing upper end 22a beyond the angle at which the movable guide pressing upper end 22a can abut against the stopper surface 13e. To move the movable guide 13 to the upper end 22a of the movable guide.
Can be positioned and held at a predetermined height determined by the height. The feed roller shaft 9 is then stopped at an appropriate time.

Below the movable guide 13, a stopper member 24 is provided at a fixed position where the stopper end 22b of the movable guide operation spring 22 abuts and is prevented from rotating.
The stopper member 24 is configured such that the feed roller shaft 9 is
(A) rotates forward from the state shown in FIG.
a is separated from the supported surface 13d of the movable guide 13,
The movable guide operating spring 22 is provided at a position where the stopper end 22b abuts. Thus, when the paper feed roller shaft 9 starts to rotate forward, the movable guide operating spring 22 also rotates with it, and the movable guide push upper end 22a rotates downward, allowing the movable guide 13 to descend. And
As a result, the original 1 supported by the movable guide 13 can be placed on the outer peripheral surface of the paper feed roller 3, and thereafter, the stopper end 22b abuts against the stopper member 24, and thereafter, the movable guide operation spring 22 It will stop at the position. At this time, the direction of rotation of the feed roller shaft 9 is also in the loosening direction of the movable guide operation spring 22 that is prevented from rotating at the stopper end 22b, so that the feed roller shaft 9 continues to rotate forward. Paper can be fed without any trouble. Thus, in this embodiment, the movable guide operating spring 22 and the supported surface 13 of the movable guide 13
The movable guide 13 is moved up and down by d, the stopper surface 13e, the stopper member 24, and the like. Therefore, these portions constitute a movable guide operating mechanism that moves the movable guide 13 up and down.

As described above, the clutch drum 18 for transmitting the rotation of the paper feed roller shaft 9 to the paper feed roller 3 can rotate at a certain angle with respect to the paper feed roller 3. The idling angle is determined by the fact that the feed roller shaft 9 starts rotating forward from the state shown in FIG.
2a pivots downward to lower the movable guide 13, so that the rotation is transmitted to the paper feed roller 3 after at least the document 1 supported by the movable guide 13 is placed on the outer peripheral surface of the paper feed roller 3. And preferably, as shown in FIG.
1 starts to rotate forward from the state shown in FIG.
As shown in FIG. 0 (b), when the movable guide push upper end 22a is separated from the movable guide 13 and the rotation of the movable guide operation spring 22 is stopped, the rotation is transmitted to the paper feed roller 3.

The assembling operation of each component with respect to the paper feed roller shaft 9 in the paper feeder having the above-described configuration will be described.
First, the drive clip 16 is attached to the D-cut portion 9a of the feed roller shaft 9. Next, the assembly in which the movable guide operation spring 22 and the spring 19 are attached to the driving drum 17 in advance and the clutch drum 18 is fitted is inserted from the end of the feed roller shaft 9, and the hole 17 of the driving drum 17 is inserted.
a into the drive clip 16. Thereafter, the feed roller 3 is inserted from the end of the feed roller shaft 9, and the protrusion 18 d at the end of the clutch drum 18 is moved to the wall surface 3 c of the feed roller 3.
Then, the phase of the paper feed roller 3 is adjusted so as to abut on the portion without the protrusion 3d, and then the snap fit 20 is attached to the back surface of the paper feed roller 3. As described above, the components constituting the one-way clutch, the paper feed roller 3, and the like can be attached to the paper feed roller shaft 9. At this time, since a troublesome operation such as screwing is not required, the assembling work can be performed extremely easily. Further, since the position of each component attached to the feed roller shaft 9 in the axial direction is determined by the drive clip 16 and the snap fit 20, the mounting position of the drive clip 16 and the snap fit 20 can be accurately determined. ,
The axial position of each component can be accurately positioned, and the one-way clutch including the drive drum 17, the clutch drum 18, and the spring 19 can be operated well.

Next, the operation of the paper feeder of this embodiment will be described. At the time of paper feeding, the state is as shown in FIG. 10B, the paper feeding roller shaft 9 rotates in the forward direction shown by the arrow C, and the rotation is transmitted to the paper feeding roller 3 via the transmission means 15, As a result, the paper feed roller 3 also rotates in the forward direction,
Original 1 is pulled out from the bottom and fed. At this time, the movable guide operation spring 22 is stopped at the position where the stopper end 22b is restrained by the stopper member 24, and the movable guide 13 is at the lower retreat position where the movable guide 13 does not come into contact with the original 1 and interferes with the sheet feeding. Never. When the leading end of the document sent out by the forward rotation of the paper feed roller 3 reaches the downstream transport roller and is transported by the transport roller, the paper feed roller shaft 9 stops rotating, and the document is transported by the transport roller. Conveyed by. At this time, the paper feed roller 3 is pulled by the original being conveyed. However, an idling area is provided between the paper feed roller 3 and the clutch drum 19 of the transmission means 15, and the transmission means 15 is a one-way clutch. The paper feed roller 3 is pulled by the document and rotates freely,
No problem. Further, even if the paper feed roller shaft 9 continues to rotate after the document is conveyed at a speed higher than the feed speed of the paper feed roller by the downstream conveyance roller, there is no problem. When the feeding of one document is completed, the feed roller shaft 9 starts to rotate forward again, and the rotation is transmitted by the transmission means 15.
The document is transmitted by the paper feed roller 3 via the printer, and the feeding of the next document is started. At this time, after the feed roller shaft 9 starts rotating, the feed roller 3 and the clutch drum 19 of the transmission unit 15 are rotated.
The paper feed roller 3 starts rotating with a delay corresponding to the idling region between the two. Therefore, the space between the trailing edge of the preceding document and the leading edge of the succeeding document can be greatly increased, and the leading edge of the document can be easily and reliably detected.

When the feeding of the document set on the document table 2 is completed, the feed roller shaft 9 rotates in the reverse direction indicated by the arrow B. By this reverse rotation, the movable guide push upper end 22a of the movable guide operation spring 22 also rotates in the direction of arrow B, and FIG.
As shown in (a), the movable guide 13 is pushed up and stopped at a position where it abuts against the stopper surface 13e. As a result, the movable guide 13 is pushed up to the operating position where the upper surface thereof is slightly higher than the outer peripheral surface of the paper feed roller 3,
Held in that position. The feed roller shaft 9 stops a little after the movable guide operation spring 22 stops.

Thereafter, the paper feeder stands by in a state shown in FIG. 10A (however, no original is set).
When the operator sets the document 1 in this state, the leading end of the bundle of the document 1 is inserted and set between the movable guide 13 and the separation piece 4 as described in the embodiment of FIGS. At this time, since the lowermost document is supported by the movable guide 13 and does not contact the paper feed roller 3, the original can be set in a favorable shape.

Next, the feed roller shaft 9 starts to rotate forward in the direction indicated by the arrow C. Due to this rotation, the movable guide push upper end 22a of the movable guide operation spring 22 rotates downward, and the movable guide 13 is allowed to descend. Therefore, the movable guide 13 descends as shown in FIG. 10B, and the supported document 1 is placed on the paper feed roller 3. here,
Since there is an idling region between the paper feed roller 3 and the clutch drum 18 of the transmission means 15, even if the paper feed roller shaft 9 starts rotating, the paper feed roller 3 does not immediately rotate. The document does not come out immediately after coming into contact with the middle paper feed roller 3. If the document descending to the rotating paper feed roller 3 comes into contact and is fed out, the document is often fed obliquely because the document is fed out from the contacted portion. Diagonal feeding of the document is prevented.

Then, when the movable guide 13 is sufficiently lowered and the leading end of the document 3 is securely placed on the sheet feeding roller 3, the sheet feeding roller 3 starts to rotate and starts feeding the document. In addition, even when the leading edge of the document is strongly pressed between the movable guide 13 and the separating piece 4 when the document is set and an excessive pressing force is applied to the leading edge of the document, when the document guide 13 descends, the excessive The pressing force is reduced,
Document feeding is performed satisfactorily.

[0041]

As is apparent from the above description, the present invention relates to a movable guide having a document supporting surface formed on the upper surface at a position upstream of a paper feed roller and at a position capable of supporting a document set on a document table. The movable guide is retracted to a retracted position lower than the original on the original platen when the paper is fed by the paper supply roller, but when the paper supply roller is on standby, the original support surface is Is positioned above the upper surface of the document, and is moved to an operation position where the leading end of the supported document can be positioned upward away from the outer peripheral surface of the paper feed roller. When the bundle is set by inserting the leading end between the feed roller and the separation piece, the leading end of the lower document does not come into contact with the outer peripheral surface of the feed roller to stop the advancement. Manuscript advanced most Can be easily set to Jo,
This has the effect of preventing defective paper feeding.

Further, according to the present invention, a movable guide is provided at a position upstream of the paper feed roller and at a position capable of supporting a document set on the document table, and the movable guide is provided along both sides of the paper feed roller. The movable guide is retracted to a retracted position lower than the original on the original table when the paper is fed by the paper feed roller, but the movable guide is in a standby state. Occasionally, the configuration is such that the leading end of the document held on the document supporting surface is moved to an operating position where the leading end of the document held on the document supporting surface is located upward away from the outer peripheral surface of the sheet feeding roller. When the leading end of a bundle of originals consisting of a large number of originals is inserted between the feed roller and the separating piece and set, the lower end of the original abuts against the outer peripheral surface of the feed roller to stop the advancement. Without this Therefore, the lowermost document can be easily set to the most advanced shape, and when the bundle of documents is inserted, the operator strongly presses the document and excessive pressing force acts on the leading edge of the document. In addition, the movable guide descends during paper feeding, so the excessive pressing force applied to the original can be reduced, and stable and good paper feeding can always be performed without causing jamming of the original or poor feeding. It has the effect of being able to do it.

Further, according to the present invention, the movable guide
The movable guide is provided to be rotatable about an axis parallel to the axis of the paper feed roller, and further, in order to move the movable guide up and down, the movable guide is lifted to an operation position by reverse rotation of the paper feed roller shaft, and the paper feed is performed. By providing a movable guide operating mechanism that releases lifting of the movable guide by forward rotation of the roller shaft, the movable guide can be smoothly and stably moved up and down while supporting the movable guide with a simple support mechanism. Also, there is an effect that the drive can be simplified without requiring a drive source dedicated to the movable guide for the vertical movement.

According to the present invention, there is also provided a movable guide operating spring having a coil spring shape wound on a cylindrical surface which rotates integrally with a feed roller shaft, wherein the movable guide operating mechanism described above is provided. A movable guide operation spring having a movable guide push upper end extending in the reverse rotation direction of the shaft and smoothly curved, and a stopper end having the other end extending in the forward rotation direction of the paper feed roller shaft; When the paper feed roller shaft rotates in the reverse direction and the movable guide push upper end of the movable guide operation spring rotates together therewith, the supported guide is pushed up to a predetermined height by contacting the movable guide push upper end. Surface, a stopper surface formed adjacent to the supported surface, and for preventing further rotation of the movable guide push-up end, the paper feed roller shaft is rotated forward, and the movable guide push-up end is the movable guide push-up end. Covered After moving away from the holding surface, the movable guide operation spring has a stopper member provided at a fixed position so that the stopper end abuts and is prevented from rotating. The movable guide push-up end of the movable guide operating spring is rotated to a position where it abuts against the stopper surface of the movable guide, and the movable guide is raised to a predetermined operating position. When feeding paper, the movable guide push-up end is rotated by the normal rotation of the feed roller shaft. To move the movable guide down, and place the original supported on it on the paper feed roller for normal paper feeding. This has the effect that it can be moved up and down.

According to the present invention, there is further provided a sheet feeder provided with the above-mentioned movable guide and movable guide operating mechanism.
By providing transmission means for delaying the forward rotation of the paper feed roller and transmitting the same to the paper feed roller between the paper feed roller shaft and the paper feed roller, the paper feed roller started to rotate forward during paper feeding. Initially, the paper feed roller does not rotate, and after the document supported on the movable guide is placed on the paper feed roller, the paper feed roller can be rotated, and the document is fed obliquely. Has the effect of preventing

Further, according to the present invention, in a paper feeder provided with a movable guide operating mechanism having the above movable guide and a movable guide operating spring for moving the movable guide up and down, the paper feed roller shaft further comprises: A transmission clip for transmitting only the forward rotation of the paper feed roller shaft to the paper feed roller is provided, and the transmission means is a drive clip detachable from a D-cut portion formed at a predetermined position of the paper feed roller shaft. A drive clip having a substantially D-shaped inner surface shape conforming to the D-cut portion and having an outer surface shape similar thereto, and a cylindrical through-hole fitted and held in the paper feed roller shaft, and having the drive at one end. A drive drum provided with a substantially D-shaped inner surface-shaped hole fitted on the outer periphery of the clip, a clutch drum rotatably provided with respect to the paper feed roller shaft, And a spring connected to transmit only the rotation of the drive drum in the forward direction to the clutch drum. The clutch drum is allowed to idle at a predetermined angle to the paper feed roller, but thereafter the rotation is transmitted. In addition, the drive drum is formed with a cylindrical surface, and the movable guide operation spring is wound around the cylindrical surface and held. The movable guide can be moved up and down, and the paper feed roller can be rotated by the forward rotation of the paper feed roller shaft after the original has been placed thereon to perform good paper feeding. When mounting the drive drum, only a D-cut portion is formed at one position of the feed roller shaft, and the drive drum is fixed to a fixed position by using a detachable drive clip at the D-cut portion. It can be held so as to rotate integrally with the feed roller shaft, and other parts can be assembled by simple operations such as simply inserting it, making assembly work easy and simplifying the whole structure to reduce cost. It is possible to achieve the effect.

Further, according to the present invention, in a paper feeder provided with a paper feed roller and a paper feed roller shaft rotatably holding the paper feed roller, the paper feed roller shaft is rotated forward by the paper feed roller shaft. A transmission clip for transmitting only the D to the paper feed roller, the transmission means being a drive clip detachable from a D-cut portion formed at a predetermined position of the paper feed roller shaft;
A drive clip having a substantially D-shaped inner surface shape conforming to the cut portion and having an outer surface shape similar thereto; a drive clip having a cylindrical through hole fitted and held on the paper feed roller shaft and having an outer periphery of the drive clip at one end. A drive drum having a substantially D-shaped inner surface-shaped hole, a clutch drum rotatably provided with respect to the feed roller shaft, and the drive drum and the clutch drum. By having a spring connected to transmit only rotation in the direction to the clutch drum, by connecting the clutch drum to transmit rotation to the paper feed roller,
The paper feeding roller can be driven so that the paper feeding roller can perform a paper feeding operation without hindrance, and in mounting the transmission means, only a D-cut portion is formed at one position of the paper feeding roller shaft. The drive drum can be held at a fixed position so as to rotate integrally with the paper feed roller shaft by using a detachable drive clip on the D-cut portion, and other parts can be simply inserted and other simple operations. It is possible to assemble, to facilitate the assembling work, and to simplify the structure of the entire transmission means as compared with a conventionally used one-way clutch, thereby reducing the cost.

[Brief description of the drawings]

FIG. 1A is a schematic cross-sectional view showing a main part of a sheet feeding device according to a first embodiment of the present invention, and showing a state in which an original is set on a stopped sheet feeding roller. FIG. 1 is a schematic cross-sectional view showing a main part of a sheet feeding device according to a first embodiment of the present invention and showing a state during sheet feeding.

FIG. 2 is a schematic perspective view of a main part of the embodiment shown in FIG.

FIG. 3A is a schematic cross-sectional view showing a main part of a sheet feeding device according to a second embodiment of the present invention, and showing a state in which a document is set on a stopped sheet feeding roller. Is a schematic cross-sectional view showing a main part of a sheet feeding device according to a second embodiment of the present invention and showing a state during sheet feeding.

FIG. 4 is a schematic perspective view of a main part of the embodiment shown in FIG. 3;

5A is a schematic cross-sectional view showing a state in which a document is pushed between the movable guide 13 and the separating piece 4 in the embodiment shown in FIG. 3; FIG. 5B is a state in which the movable guide 13 is lowered; Schematic sectional view

FIG. 6 is a schematic perspective view of a main part showing still another embodiment of the present invention.

FIG. 7 is a schematic perspective view showing the paper feed roller in the embodiment of FIG.

FIG. 8 is a schematic cross-sectional view of the paper feed roller shown in FIG.

9 is an exploded perspective view of a sheet feeding roller in the embodiment of FIG.

10A and 10B are schematic cross-sectional views showing portions indicated by arrows AA in FIG. 8 in different states, respectively.

FIG. 11A is a schematic cross-sectional view illustrating a main part of a conventional paper feeder and showing a state where a document is correctly set. FIG. 11B is a schematic cross-sectional view illustrating a main part of the conventional paper feeder. Schematic sectional view showing a badly set state

FIG. 12 is a schematic perspective view of a main part of a conventional sheet feeding device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 original 2 original platen 3 paper feed roller 4 separation piece 7 original guide 8, 8A, 8B hole 9 paper feed roller shaft 9a D cut section 11, 13 movable guide 11a, 13a original support surface 11b, 13b support shaft 13d supported surface 13e Stopper surface 15 Transmission means 16 Drive clip 17 Drive drum 18 Clutch drum 19 Spring 22 Movable guide operating spring 22a Movable guide push-up end 22b Stopper end 24 Stopper member

Claims (7)

[Claims] An original table for setting a plurality of originals; a paper feed roller disposed at a lower end position of the original table;
A separation piece pressed against the paper feed roller to prevent double feeding of the document, and a separation piece provided upstream of the paper feed roller and at a position capable of supporting the document set on the document table, and supporting the document on the upper surface. The movable guide has a retractable position lower than the original on the platen when the paper is fed by the paper feed roller. In a standby state, the document supporting surface is located above the upper surface of the document table, and is moved to an operating position where the leading end of the supported document can be moved upward from the outer peripheral surface of the paper feed roller. A sheet feeding device characterized by the above-mentioned. 2. A document table for setting a plurality of documents, a paper feed roller disposed at a lower end position of the document table,
A separation piece pressed against the paper feed roller to prevent double feeding of the original, and a movable guide provided at a position upstream of the paper feed roller and at a position capable of supporting the original set on the original table. The movable guide has a document supporting surface extending along both sides of the paper feed roller, and furthermore, the movable guide has a retreat lower than a document on the document table when paper is fed by the paper feed roller. However, when the paper feed roller is on standby, the paper feed roller is located above the upper surface of the document table, and the leading end of the document held on the document support surface is separated upward from the outer peripheral surface of the paper feed roller. A sheet feeding device, wherein the sheet feeding device is configured to move to an operating position in which the sheet feeding position is set. 3. A paper feed roller provided upstream of the paper feed roller is rotatable about an axis parallel to the axis of the paper feed roller. 3. A movable guide operating mechanism for lifting the movable guide to an operating position by reverse rotation of a shaft and releasing lifting of the movable guide by forward rotation of the paper feed roller shaft. Paper feeder. 4. The movable guide operating mechanism is a coil spring-shaped movable guide operating spring wound on a cylindrical surface that rotates integrally with the paper feed roller shaft, and one end of the movable guide operation spring is in the reverse rotation direction of the paper feed roller shaft. A movable guide operation spring having an extended and smoothly curved movable guide push upper end, and a stopper end extended at the other end in the forward rotation direction of the paper feed roller shaft; When the paper roller shaft rotates in the reverse direction and the movable guide push-up end of the movable guide operating spring rotates together therewith, the supported surface pushed up to a predetermined height by contacting the movable guide push-up end, and the supported surface. A stopper surface formed adjacent to the upper surface of the movable guide to prevent further rotation of the upper end of the movable guide, and the feed roller shaft is rotated forward, and the upper end of the movable guide is separated from the supported surface of the movable guide. After, before 4. A stopper member provided at a fixed position so that a stopper end of the movable guide operation spring abuts and is prevented from rotating.
Paper feeder as described. 5. A feeding means for transmitting the forward rotation of the feed roller shaft to the feed roller, wherein the transmitting means is provided by a movable guide operating mechanism which lifts the movable guide to the operating position. The shaft starts to rotate forward, and the forward rotation of the paper feed roller shaft lowers the movable guide, at least after the document on the movable guide is placed on the paper feed roller,
4. A configuration in which the forward rotation of the paper feed roller shaft is delayed and transmitted to the paper feed roller so that the forward rotation of the paper feed roller shaft is transmitted to the paper feed roller. 4. The paper feeder according to 4. 6. A paper feeding roller shaft is provided with a transmission means for transmitting only a forward rotation of the paper feeding roller shaft to the paper feeding roller, and the transmission means is formed at a predetermined position of the paper feeding roller shaft. A drive clip detachably attached to the D-cut portion, the drive clip having a substantially D-shaped inner surface shape corresponding to the D-cut portion and having an outer surface shape similar to the drive clip, and being fitted to the feed roller shaft. A driving drum having a cylindrical through hole to be held and having a substantially D-shaped inner surface-shaped hole fitted at one end to the outer periphery of the driving clip; and a rotatably provided rotatable with respect to the paper feed roller shaft. A clutch drum; and a spring connecting the drive drum and the clutch drum so as to transmit only the forward rotation of the drive drum to the clutch drum, wherein the clutch drum is connected to the paper feed roller. 4. The paper feeding device according to claim 3, wherein the driving drum has a cylindrical surface, and a movable guide operating spring is wound around the cylindrical surface. 7. A paper feed roller, a paper feed roller shaft for rotatably holding the paper feed roller, and a transmission means for transmitting only a forward rotation of the paper feed roller shaft to the paper feed roller, The means is a drive clip detachably attached to a D-cut portion formed at a predetermined position of the paper feed roller shaft, and has a substantially D-shaped inner surface shape corresponding to the D-cut portion and an outer surface shape similar thereto. A driving drum having a cylindrical through hole fitted and held on the paper feed roller shaft and having a substantially D-shaped inner surface hole fitted at one end to the outer periphery of the driving clip; A clutch drum rotatably provided with respect to a feed roller shaft; and a spring for connecting the drive drum and the clutch drum so that only the forward rotation of the drive drum is transmitted to the clutch drum. Wherein the clutch drum is connected so as to transmit rotation to the paper feed roller.