JP2005306544A - Paper feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper feeder capable of normally feeding rolled paper without removing it from the paper feeder even when the rolled paper is set in any direction. <P>SOLUTION: A guide roller 10 is movably provided in response to the setting form of the rolled paper 2 and when the rolled paper 1 is set to the first form, the guide roller 10 is positioned at a position opposite to a draw-out direction of a recording paper 2a and a support member 3 is rotated in an arrow A direction to feed the recording paper 2a (a). When the rolled paper 2 is set to the second form, the guide roller 10 is moved onto the recording paper 2a and a rotation direction of the support member 3 is switched to an arrow A' direction interlocking with movement of the guide roller 10 (b). Thereby, the recording paper 2a can be smoothly fed regardless of the set form of the rolled paper 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a paper feeding device that feeds recording paper wound in a roll shape, which is used in an image forming apparatus such as a digital copying machine or a laser printer.

  2. Description of the Related Art Conventionally, image forming apparatuses that store recording paper wound in a roll shape (hereinafter referred to as roll paper) inside the apparatus, pull out the recording paper and transport it to an image forming unit to form an image are widely used. FIG. 9A shows a schematic configuration of a paper feeding device used in such an image forming apparatus. In the figure, reference numeral 1 denotes a housing of a paper feeding device, in which a roll paper 2 in which a recording paper 2a is wound around a core material 2b in a roll shape is stored. Reference numeral 3 denotes a support member inserted into the core material 2b of the roll paper 2 from both left and right ends. A rotating shaft 3 a protrudes from the center of the support member 3 and is rotatably fitted to the bearing portion 4 a of the frame body 4. Since FIG. 9A is a side view of the sheet feeding device 1, only one of the support member 3, the rotating shaft 3a, and the bearing portion 4a is shown. Here, the support member 3 is inserted separately from the left and right ends of the core material 2b. However, the support member 3 may be integrally provided so as to penetrate the inside of the core material 2b.

  A pinion gear 5a is attached to the tip of the rotating shaft 3a, and gears 6a and 6b are connected to mesh with the pinion gear 5a. A pinion gear 5b attached to the drive shaft of the motor 7 is connected to the gear 6b. The pinion gears 5a and 5b and the gears 6a and 6b constitute a gear train 9 that transmits the rotational force from the motor 7 to the rotary shaft 3a. The gear train 9 and the motor 7 rotate the support member 3 to roll paper. 2 constitutes a paper feeding means for pulling out and feeding the recording paper 2a. In this configuration, by rotating the motor 7 in the direction of arrow B, the roll paper 2 rotates in the direction of arrow A, and the recording paper 2a is pulled out and conveyed to the pair of paper feed rollers 8 of the image forming apparatus. Are sequentially conveyed to an image forming unit, a fixing unit, and the like of the image forming apparatus.

  As described above, since the setting of the roll paper 2 is normally completed by attaching the support members 3 to both ends of the roll paper 2 and fitting the bearing members 4a of the frame body 4, the roll paper 2 is shown in FIG. A set form in which the recording paper 2a is fed from the lower side of the roll shape (hereinafter referred to as a first form) and a set form in which the recording sheet 2a is fed from the upper side of the roll shape (hereinafter referred to as a). , Referred to as the second form). FIG. 9B shows a state in which the roll paper 2 is set in the second form. Here, when the recording paper 2a is a heat-sensitive recording paper, the heat-sensitive agent is applied only to either the front or back of the roll paper. It will be discharged without printing.

  Further, when the recording paper 2a is plain paper, printing is possible even in the second form, but the recording paper 2a is pulled out from the upper side of the roll paper 2 as shown in FIG. Therefore, it becomes difficult to smoothly guide the recording paper 2a to the paper feed roller pair 8. Further, when the second form is set, it is necessary to rotate the roll paper 2 in the direction of the arrow A ′ in FIG. 9B. Therefore, it is necessary to change the rotation direction of the motor 7 by providing a separate switch mechanism or the like. It was.

  Therefore, a method for preventing the reverse setting of the roll paper has been proposed. In Patent Document 1, a one-way clutch mechanism that rotates only in one direction is provided on the support member of the roll paper, and the roll paper is set in the reverse direction. Discloses a recording apparatus that can be easily recognized by a user. However, in the method of Patent Document 1, although the roll paper setting direction can be recognized, once the paper is set in the reverse direction, it is necessary to take out the roll paper from the paper feeder and set it again. In particular, since a large-sized roll paper such as A0 is heavy, a considerable amount of force is required for taking out and resetting from the paper feeder.

On the other hand, as a method for changing the direction of the recording paper, in Patent Document 2, the cut paper storage cassette is rotated by 90 ° so that the same size paper can be fed in both the vertical and horizontal directions. An apparatus is disclosed. However, in the case of roll paper, unlike the case of cut paper in which paper is fed one by one, it is necessary to rotate and pull out the recording paper wound in a roll shape and continuously feed paper. It has been difficult to apply this method as it is to a roll paper feeder.
JP 9-30694 A Japanese Patent Publication No. 1994-88677

  In view of the above problems, an object of the present invention is to provide a paper feeding device that can normally feed a roll paper without taking out the roll paper from the paper feeding device even when the roll paper is set in the reverse direction.

  In order to achieve the above object, the present invention provides a support member that is inserted into a central portion of a roll of recording paper, a frame that holds the support member rotatably and sets the recording paper, A sheet feeding device comprising: a sheet feeding unit configured to rotate the support member to pull out and feed the recording sheet; and a first position that does not act on the recording sheet, and the recording sheet on the sheet feeding path. A guide roller that can be selectively arranged at a second position to be guided is provided, and the paper feeding means switches the rotation direction of the support member in conjunction with the switching of the position of the guide roller. It is said.

  In the sheet feeding device having the above-described configuration, according to the first aspect of the present invention, the setting form of the recording sheet with respect to the frame body is a first form in which the recording sheet is fed from the lower side of the roll shape in the sheet feeding direction. Detecting means for detecting whether the second form is fed from the upper side of the roll shape, and when the detection result of the detecting means is the first form, the guide roller is set to the first position. And, in the case of the second form, a control means for arranging the guide roller at the second position is provided.

  According to the present invention, in the sheet feeding device having the above-described configuration, the sheet feeding unit includes a motor that applies a rotational force to the support member, a gear train that connects the motor and the support member, and the gear train. And an idle gear detachably provided between any of the gears.

  The present invention also provides a support member that is inserted into the center of the recording paper wound in a roll, a frame that holds both ends of the support member and sets the recording paper, and rotates the support member. In the sheet feeding device including the sheet feeding unit that pulls out and feeds the recording sheet, the frame body is characterized in that it can be rotated in the horizontal direction around the center in the longitudinal direction.

  According to the present invention, in the sheet feeding device having the above-described configuration, the frame body is supported on an intermediate base slidably provided outside the sheet feeding device.

  According to the first configuration of the present invention, the guide roller that can be selectively disposed at the first position that does not act on the recording paper and the second position that guides the recording paper on the paper feeding path is provided, Since the rotation direction of the support member can be switched in conjunction with the position of the guide roller, even when the recording paper is set in the reverse direction, the recording paper can be smoothly fed simply by changing the arrangement of the guide roller. This eliminates the need to take out the recording paper from the paper feeder and reset it.

  Further, according to the second configuration of the present invention, in the sheet feeding device having the first configuration, the detection unit that detects the setting form of the recording paper, and the control unit that switches the arrangement position of the guide roller based on the detection result. Thus, the arrangement of the guide rollers and the switching of the rotation direction of the recording paper can be automatically performed regardless of the setting form of the recording paper.

  According to the third configuration of the present invention, in the sheet feeding device having the first or second configuration, the motor for applying the rotational force to the support member is connected to the motor and the support member. The rotation direction of the recording paper can be switched while keeping the rotation direction of the motor constant by comprising a gear train that is connected and an idle gear that is detachably provided between any of the gears constituting the gear train. This eliminates the need for a switch mechanism for switching the rotation direction of the motor, and simplifies the configuration of the sheet feeding device.

  According to the fourth configuration of the present invention, the frame holding the recording paper in which the support member is inserted is supported so as to be rotatable in the horizontal direction with the central portion in the longitudinal direction as the center of rotation. Even if the paper is set in the reverse direction, it can be easily set in the normal direction without taking out the recording paper simply by rotating the frame 180 °, and only on the front or back side like thermal paper. Even in the case of recording paper on which image formation is possible, smooth paper feeding is possible regardless of the recording paper setting mode.

  Further, according to the fifth configuration of the present invention, in the paper feeding device having the fourth configuration, the frame body that holds the recording paper is placed on the intermediate base that is slidably provided outside the paper feeding device. By being supported, even if there is no space between the sheet feeding device main body and the frame, the frame can be easily rotated by sliding the intermediate stand to the outside of the apparatus.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view illustrating a configuration of a sheet feeding device according to a first embodiment of the present invention. Portions common to FIG. 9 of the conventional example are denoted by the same reference numerals and description thereof is omitted. For convenience of explanation, the description of the casing of the sheet feeding device 1, the gear train 6, the motor 7, and the sheet feeding roller pair 8 is omitted here. In the present embodiment, a guide roller 10 is provided for guiding the recording paper 2a drawn from the roll paper 2 to the pair of paper feed rollers 8 (see FIG. 9).

  The guide roller 10 includes a cylindrical roller body 10a and a frame 10b that passes through the center of the roller body 10a and is bent in a U shape. The roller body 10a is rotatably attached to the frame 10b. Yes. Both end portions of the frame 10b are bent inward at right angles, and are fitted into fitting holes 4b provided below the bearing portion 4a of the frame body 4. Thus, the guide roller 10 is configured to be rotatable with the fitting hole 4b as a fulcrum. Here, only one side of the fitting hole 4b is shown.

  FIG. 1 shows a state in which the roll paper 2 is set in the first form as in FIG. 9A, and the support member 3 is rotated in the direction of arrow A by the gear train 9 and the motor 7 (see FIG. 9). Then, the roll paper 2 with the support member 3 inserted also rotates in the direction of arrow A, and the recording paper 2a is pulled out. At this time, since the guide roller 10 is unnecessary, the guide roller 10 is located on the opposite side (hereinafter referred to as the first position) from the direction in which the recording paper 2a is drawn (arrow B direction). The first position may be another position as long as it does not act on the recording paper 2a.

  FIG. 2 shows a state in which the roll paper 2 is set in the second form. In this case, since the recording paper 2a is pulled out from the upper side of the roll paper 2, the guide roller 10 is rotated 180 ° from the first position and moved onto the recording paper 2a (hereinafter referred to as the second position). To do. Thereby, similarly to the case where the roll paper 2 is in the first set form, the recording paper 2 a can be smoothly guided from the lower side of the roll paper 2 to the paper feed roller pair 8. Further, in order to pull out the recording paper 2a in the direction of arrow B, it is necessary to rotate the roll paper 2 in the direction of arrow A 'as in FIG. 9B, so that the guide roller 10 moves to the second position. In conjunction with, the rotation direction of the roll paper 2 is switched to the direction of the arrow A ′.

  Next, rotation control of the sheet feeding device according to the first embodiment will be described. 3 and 4 are schematic views showing the configurations of the motor and the gear train in the states of FIGS. 1 and 2, respectively. Here, for convenience of explanation, the description of the casing 1, the frame body 4, the guide roller 10, and the like of the sheet feeding device is omitted. In this embodiment, as a power transmission means between the rotating shaft 3 a of the support member 3 and the motor 7, a gear train 9 including pinion gears 5 a and 5 b and gears 6 a, 6 b, 6 c and 6 d and a gear train 9 are attached to and detached from the gear train 9. A possible idle gear 11 is provided.

  In the state of FIG. 3 in which the roll paper is set in the first form, the idle gear 11 is disposed at a position away from the gear train 9, and the motor 7 and the rotating shaft 3a are provided with two pinion gears 5a, 5b and 4 The gears 9a to 6d are connected by six gear trains 9. By rotating the motor 7 in the arrow B direction in this state, the rotational force in the arrow A direction is transmitted to the rotation shaft 3a of the support member 3 via the gear train 9, and the roll paper 2 is rotated in the arrow A direction. Can do.

  Here, the gear train 9 is composed of six gears, but the number and size of the gears constituting the gear train 9 are the distance between the motor 7 and the support member 3, the rotational direction of the motor 7, Alternatively, it can be set as appropriate depending on the ratio (reduction ratio) between the rotation speed of the motor 7 and the feeding speed of the recording paper 2a. If the number of gears constituting the gear train 9 is an even number, the rotation direction of the motor 7 is in the direction of arrow B. If the number of gears 9 is an odd number, the rotation direction of the motor 7 is in the direction opposite to the arrow B. The direction of rotation is the direction of arrow A.

  In the state of FIG. 4 in which the roll paper is set in the second form, it is necessary to rotate the roll paper 2 in the direction of arrow A ′ in FIG. Therefore, as shown in FIG. 4, the idle gear 11 is inserted between the gear 6a and the gear 6b. That is, one or both of the gears 6a and 6b are configured to be movable along the pinion gear 5a or the gear 6c, and the gears 6a and 6b are moved by moving the gear 6a or 6b with the insertion of the idle gear 11. A gap is provided between the idle gear 11 and the gears 6a and 6b. As a result, the number of gears constituting the gear train 9 is 7, and when the motor 7 is rotated in the direction of arrow B as in FIG. 3, the rotation direction of the gear 6a is opposite to that in FIG. Accordingly, the rotational force in the direction of arrow A ′ is transmitted to the rotation shaft 3 a of the support member 3, and the roll paper 2 can be rotated in the direction of arrow A ′ without changing the rotation direction of the motor 7.

  Further, if the diameter of the idle gear 11 is made equal to either the gear 6a or the gear 6b, the rotation speed of the roll paper 2 in the arrow A ′ direction can be matched with the rotation speed of the arrow A direction. Regardless of the set form, the feeding speed of the recording paper 2a can be made constant. Although the idle gear 11 is inserted between the gear 6a and the gear 6b here, the insertion position of the idle gear 11 may be between the motor 7 and the rotating shaft 3a. For example, the idle gear 11 is connected between the gear 6b and the gear 6c. It may be inserted between the pinion gear 5a and the gear 6a, or between the gear 6d and the pinion gear 5b.

  Further, the rotation control of the sheet feeding device is further facilitated by interlocking the insertion operation of the idle gear 11 to the gear train 9 and the detachment operation from the gear train 9 with the switching of the position of the guide roller 10. That is, when the roll paper 2 is set in the first form and the guide roller 10 is in the first position, the idle gear 11 is in the position shown in FIG. 3, the roll paper 2 is set in the second form, and the guide roller 10 If the idle gear 11 and the drive mechanism of the guide roller 10 are connected so that the idle gear 11 is in the position shown in FIG. 4 when it is moved to the second position, the support member 3 is adapted to the arrangement of the guide roller 10. The rotation direction can be set reliably.

  In the present embodiment, the rotation direction of the roll paper 2 is switched by inserting the idle gear 11 into the gear train 9. However, the control means for the rotation direction is not limited to this. It is also possible to provide a switch mechanism for switching the supply current and control the rotation direction of the motor 7 by switching the switch according to the position of the guide roller 10. However, when the idle gear 11 is provided and the rotation direction of the roll paper 2 is controlled as in this embodiment, it is more preferable because it is not necessary to separately provide a switch mechanism and the control of the motor 7 becomes simple.

  Next, a second embodiment of the present invention will be described. 5A and 5B are side views showing the overall configuration of the sheet feeding device according to the second embodiment. FIG. 5A shows a state in which roll paper is set in the first form, and FIG. 5B shows roll paper. Shows the state set in the second mode. Portions common to FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, in addition to the configuration of the first embodiment, the detection unit 12 that automatically detects the set form of the roll paper 2 and the switching of the arrangement position of the guide roller 10 are controlled based on the detection result of the detection unit 12. And a control means 13 is provided.

  FIG. 6 is a flowchart illustrating a sheet feeding procedure by the sheet feeding device according to the second embodiment. With reference to FIGS. 5A and 5B, the sheet feeding operation of the sheet feeding device will be described in accordance with the steps in FIG. In this operation procedure, when the roll paper 2 is set in the paper feeding device 1 (step S1), the setting form of the roll paper 2 is detected by the detection means 12 (step S2). The detecting means 12 detects, for example, the position where the recording paper 2a is pulled out from the roll paper 2 and the degree of slack, and determines whether the roll paper 2 is set in the first form or the second form. The detection result is transmitted to the control means 13.

  The control means 13 determines the roll paper 2 set form based on the transmission from the detection means 12 (step S3). If it is determined that the set form is the first form, it is next determined whether or not the guide roller 10 is in the first position (step S4). If it is determined in step S4 that the guide roller 10 is in the second position, the guide roller 10 is moved to the first position behind the sheet feeder 1 as shown in FIG. 5A (step S5). Further, as the guide roller 10 moves, the idle gear 11 moves to a position where it is detached from the gear train 9 (step S6).

  Next, by rotating the motor 7 in the direction of arrow B (step S7), the roll paper 2 is rotated in the direction of arrow A and the recording paper 2a is pulled out (step S8). 2a is fed (step S9). If it is determined in step S4 that the guide roller 10 is in the first position, the idle gear 11 is also detached from the gear train 9, so that the motor is not moved without moving the guide roller 10 and the idle gear 11. 7 is rotated in the direction of arrow B to feed the recording paper 2a (steps S7 to S9).

  On the other hand, if it is determined in step S3 that the set form is the second form, it is next determined whether or not the guide roller 10 is in the second position (step S10). If it is determined in step S10 that the guide roller 10 is in the first position, the guide roller 10 is moved to the second position as shown in FIG. 5B (step S11). Further, as the guide roller 10 moves, the idle gear 11 is inserted between the gears 6a and 6b (step S12).

  Next, by rotating the motor 7 in the direction of the arrow B (step S13), the roll paper 2 is rotated in the direction of the arrow A 'and the recording paper 2a is pulled out (step S14). Then, the recording paper 2a is fed. If it is determined in step S10 that the guide roller 10 is in the second position, since the idle gear 11 is also inserted into the gear train 9, the motor 7 is operated without moving the guide roller 10 and the idle gear 11. By rotating in the direction of arrow B, the roll paper 2 is rotated in the direction of arrow A ′, the recording paper 2a is pulled out (steps S13 and S14), and the recording paper 2a is fed (step S9).

  Thereby, it is possible to automatically control the driving of the guide roller 10 and the idle gear 11 performed according to the setting form of the roll paper 2, and no special operation is performed regardless of the direction in which the user sets the roll paper 2. It is possible to smoothly feed the recording paper 2a without performing the above. Here, the rotation direction of the roll paper 2 is switched by inserting and removing the idle gear 11, but a switch mechanism may be provided to switch the rotation direction of the motor 7 electrically. The detection unit 12 and the control unit 13 may be provided on the image forming apparatus main body side.

  Next, a third embodiment of the present invention will be described. FIG. 7 is a schematic perspective view showing the overall configuration of the sheet feeding device according to the third embodiment. Portions common to FIG. 1 are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, the frame body 4 on which the roll paper 2 is set is supported on the intermediate table 15 provided on the bottom surface 1b so as to be rotatable in the horizontal direction with the central portion O in the longitudinal direction as the rotation center. . Further, the rear wall 1a of the sheet feeding device 1 is supported so as to be vertically rotatable with respect to the bottom surface 1b, and a handle portion 1c is formed at the center of the rear wall 1a.

  The roll paper resetting operation in this embodiment will be described with reference to FIG. Long holes 14 are provided at two locations on the bottom surface 1 b of the paper feeding device 1 in parallel with the paper feeding direction (in the direction of arrow AA ′). The intermediate stage 15 supports the frame 4 so as to be rotatable in the horizontal direction (arrow BB ′ direction), and is held by the eyelet 16 so as to be slidable on the bottom surface 1 b along the long hole 14 in the arrow AA ′ direction. Now, when the roll paper 2 is set to the 2nd form, a user grasps the handle part 1c (refer FIG. 7), and falls down the rear wall 1a to the back side. Next, the intermediate table 15 on which the frame body 4 is supported is slid in the direction of arrow A and pulled out from the housing 1 of the sheet feeding device. Then, after the roll paper 2 is set, the frame 4 is rotated by 180 ° to switch the roll paper 2 setting form to the first form, and then the intermediate table 15 is slid again in the direction of the arrow A ′. It is housed inside the body 1 and finally the rear wall 1a is returned to its original position.

  Thereby, even when the roll paper 2 is set in the second form, it can be reset to the first form without being removed from the frame body 4, and the recording paper 2a drawn out from the roll paper 2 can be fed smoothly. be able to. Further, in the present embodiment, the frame 4 itself on which the roll paper 2 is set is rotated to return the setting direction to the normal direction. Therefore, the recording paper 2a is a heat-sensitive recording paper coated with a heat-sensitive agent only on either the front or back. Even in this case, the set form can be changed without taking out the roll paper 2 from the paper feeder.

  Although it is possible to directly attach the frame body 4 to the bottom surface 1b without providing the intermediate stage 15, in that case, it is necessary to provide a rotation space for the frame body 4 inside the housing 1, and the large size of the sheet feeding device. Leading to For this reason, it is preferable from the viewpoint of downsizing the sheet feeding device that the frame body 4 is attached to the slide type intermediate base 15 and the frame body 4 is rotated outside the housing 1 as in the present embodiment. . Here, the rear wall 1a can be opened and closed, and the intermediate table 15 is slid rearward. However, instead of the rear wall 1a, for example, the side wall 1d or 1d 'can be opened and closed, and the intermediate table 15 is moved sideways. It is good also as a structure which makes it slide and pulls outside.

  In each of the above-described embodiments, only the paper feeding of the roll paper in which the recording paper is wound around the cylindrical core material has been described. However, the paper feeding device according to the present invention also feeds the roll paper without using the core material. It can be used in exactly the same way.

  The present invention relates to a support member that is inserted into the central portion of a roll of recording paper, a frame that holds the support member rotatably and sets the recording paper, and rotates the support member for recording. In a paper feeding device including a paper feeding unit that pulls out and feeds paper, a first position that does not act on the recording paper and a second position that guides the recording paper on the paper feeding path are selectively used. A guide roller that can be arranged is provided, and the sheet feeding means switches the rotation direction of the support member in conjunction with the switching of the position of the guide roller.

  Thus, regardless of the roll paper set in any form, the user can smoothly feed the roll paper simply by changing the arrangement of the guide rollers. Since there is no need to reset it, the usability of a paper feeding device that uses a particularly large roll paper is improved.

  Further, by providing a detecting means for detecting the roll paper setting form and a control means for switching the arrangement position of the guide rollers, the arrangement of the guide rollers can be automatically changed. Provided is a paper feeding device that is free of paper feeding errors.

  Further, the sheet feeding means constitutes a motor that applies a rotational force to the support member, a gear train that connects the motor and the support member, a gear train that connects the motor and the support member, and the gear train. By comprising an idle gear that is detachably provided between any of the gears, the rotation direction of the roll paper can be switched while keeping the rotation direction of the motor constant. It will be easy.

  In addition, the frame body that holds the roll paper in which the support member is inserted is supported so as to be rotatable in the horizontal direction with respect to the housing of the paper feeding device with the central portion in the longitudinal direction as the center of rotation. Even when the form is reversed, it can be easily reset to a normal form by simply rotating the frame 180 °, and it is a heat-sensitive roll paper that can form an image only on the front or back side. However, it can be reset without taking out the roll paper. Furthermore, by supporting the frame body on an intermediate base that can slide outside the apparatus, the frame body can be easily rotated even when there is no rotation space between the housing and the frame body of the sheet feeding device. .

These are the schematic perspective views which show the state which set the roll paper to the 1st form in the paper feeder which concerns on 1st Embodiment of this invention. These are the schematic perspective views which show the state which set the roll paper to the 2nd form to the paper feeder which concerns on 1st Embodiment. These are the schematics which show the structure of the motor and gear train in the state which set the roll paper to the 1st form. These are the schematic diagrams which show the structure of the motor and gear train in the state which set the roll paper to the 2nd form. These are side views which show the whole structure of the paper feeder concerning 2nd Embodiment of this invention. These are the flowcharts which show the paper supply procedure by the paper feeder of 2nd Embodiment. These are the schematic perspective views which show the state which set the roll paper to the 1st form in the paper feeder which concerns on 3rd Embodiment of this invention. These are the schematic perspective views which show the reset operation of roll paper at the time of setting roll paper to the 2nd form to the paper feeder which concerns on 3rd Embodiment. These are side views which show schematic structure of the conventional paper feeder for roll paper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing | casing 1a Back wall 2 Roll paper 2a Recording paper 3 Support member 3a Rotating shaft 4 Frame 4a Bearing part 5a, 5b Pinion gear 6a, 6b, 6c, 6d Gear 7 Motor 8 Feeding roller pair 9 Gear train 10 Guide roller 11 Idle gear 12 Detection means 13 Control means 15 Intermediate stand

Claims (5)

A support member inserted into a central portion of the recording paper wound in a roll, a frame for holding the support member rotatably and setting the recording paper, and rotating the support member to remove the recording paper A sheet feeding device including a sheet feeding unit for drawing and feeding;
A guide roller that can be selectively arranged at a first position that does not act on the recording paper and a second position that guides the recording paper on a paper feeding path is provided, and the paper feeding means includes: A paper feeding device that switches the rotation direction of the support member in conjunction with the switching of the position of the guide roller.   The recording paper is set on the frame body in a first form in which the recording paper is fed from the lower side of the roll shape in the paper feeding direction, or in a second form in which the recording paper is fed from the upper side of the roll shape. Detecting means for detecting whether it is in the form, and when the detection result of the detecting means is in the first form, the guide roller is disposed at the first position, and in the case of the second form, The sheet feeding device according to claim 1, further comprising: a control unit that arranges a guide roller at the second position.   The paper feeding means is detachably provided between a motor that applies a rotational force to the support member, a gear train that connects the motor and the support member, and any gear that constitutes the gear train. The sheet feeding device according to claim 1, comprising an idle gear. A support member inserted into the center of the recording paper wound in a roll shape, a frame for holding the both ends of the support member and setting the recording paper, and rotating the support member to remove the recording paper A sheet feeding device including a sheet feeding unit for drawing and feeding;
The sheet feeding device according to claim 1, wherein the frame is rotatable in a horizontal direction with a central portion in a longitudinal direction as a rotation center.   The sheet feeding device according to claim 4, wherein the frame body is supported on an intermediate stage slidably provided outside the sheet feeding device.

Images