JP2006124147A - Laser beam printer and printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a large range of movement of a recording paper rear end abutting part in the recording paper feeding direction, while reducing the number of parts items, in a laser beam printer. <P>SOLUTION: A paper feeding tray 9 is provided with a guide projection part 40 for guiding a recording paper regulating member 30, and the recording paper regulating member 30 is provided with a guide groove 31 to be engaged with the guide projection part 40, and a pair of notch parts 32 is provided in one part of the guide groove 31 so that the recording paper regulating member 30 can be turned around the guide projection part 40. The recording paper rear end abutting part 33 for abutting on the rear end of the recording paper is integrally provided with a rear end of the recording paper regulating member 30 to reduce the number of parts items. Range of movement of the recording paper rear end abutting part 33 can be secured large by sliding and turning the recording paper regulating member 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laser beam printer having a paper feed tray for loading recording paper and a printer.

  2. Description of the Related Art Conventionally, a paper feed tray such as a laser beam printer is provided so as to be openable and closable with respect to a cabinet that covers each part of the printer so that it can be accommodated compactly when the printer is not used. An example of such a printer having a paper feed tray is shown in FIG. The paper feed tray 109 is provided on the front side of the printer cabinet 114 so as to be openable and closable, and is opened substantially in parallel with the mounting surface of the printer. An opening 146 for accommodating the recording paper regulating member 130 is provided in a substantially central portion of the paper feed tray 109. The recording paper regulating member 130 is incorporated so as to be slidable in the recording paper conveyance direction C while being guided by the edge of the opening 146. In addition, a guide groove 131 for guiding the recording paper trailing edge contact member 133 is formed in the substantially central portion of the recording paper regulating member 130 over substantially the entire length of the recording paper regulating member 130. The recording paper rear end contact member 133 contacts the rear end of the recording paper and regulates the posture of the rear end of the recording paper loaded in the paper feed tray 109. The recording paper regulating member 130 slides in the conveyance direction C with respect to the paper feed tray 109, and the recording paper trailing edge contact member 133 slides in the conveyance direction C with respect to the recording paper regulating member 130. As a result, the position of the recording paper trailing edge contact member 133 can be adjusted in a wide range of recording papers of various sizes.

  However, in the conventional printer described above, in order to configure the recording paper trailing edge contact member 133 to be slidable with respect to the recording paper regulating member 130, both of them must be manufactured separately as separate parts. Therefore, it is difficult to reduce the manufacturing cost of the printer. Therefore, it is not suitable for a low-cost printer for consumers, for which a reduction in price is particularly required.

Further, Patent Document 1 discloses a paper feed tray that realizes functions equivalent to those of the recording paper rear end abutting member and the recording paper regulating member by a plurality of plate-like members that are slidable in the recording paper conveyance direction. It is shown. Japanese Patent Application Laid-Open No. H10-228561 discloses a printer provided with a recording paper rear end abutting member that is rotated and accommodated when unnecessary. In the paper feed tray or the like disclosed in the above-mentioned patent document, the number of parts increases as in the conventional printer shown in FIG. 6, and the cost cannot be reduced. Note that Patent Documents 3 and 4 show printers in which a recording paper trailing edge contact member is formed by an elastic member.
JP-A-6-227679 JP 2000-16601 A JP 2000-247451 A JP-A-11-1000012

  The present invention has been made in order to solve the above-described problems. By reducing the number of parts, the recording paper rear end abutting portion has a large movement range in the recording paper conveyance direction, thereby enabling recording. An object of the present invention is to provide a laser beam printer and a printer that can regulate the posture of the rear end of the recording paper at a low cost by reliably contacting the rear end of the paper with the rear end of the recording paper of various sizes.

  In order to achieve the above object, the invention according to claim 1 is a photoconductor drum having a surface coated with a photoconductor, a charging means for uniformly charging the surface of the photoconductor drum, and a laser beam scanned on the surface of the photoconductor. Exposure means for forming a latent image by irradiation, developing means for forming a toner image by attaching toner to a portion of the surface of the photosensitive member where the latent image is formed, and development in the rotational direction of the photosensitive drum The toner image formed on the surface of the photosensitive drum is formed on the surface of the recording drum by charging the surface of the recording drum at a predetermined transfer position downstream of the means so as to face the surface of the photosensitive drum. Transfer means for transferring the toner image, fixing means for fixing the toner image on the recording paper by applying predetermined heat and pressure to the recording paper on which the toner image has been transferred, a cabinet member covering the above means, and a cabinet member Open and close freely A paper feeding tray in which recording paper is loaded in an opened state, and a conveying means for sending the outermost paper among the recording paper loaded in the paper feeding tray and conveying it to a transfer position; Provided substantially parallel to the paper feed tray and slidable in the recording paper transport direction, abuts against the rear edge of the recording paper loaded in the paper feed tray, and In a laser printer provided with a recording paper regulating member that regulates the posture, the paper feed tray is substantially perpendicular to the tray surface and the length dimension in the direction in which the recording paper is conveyed is perpendicular to the conveying direction. And a guide convex portion that guides the recording paper regulating member when sliding, and the recording paper regulating member includes a guide groove with which the guide convex portion is engaged, In some cases, the recording is performed with the guide projection as an axis. A pair of notches cut out in a circular arc shape from the side surface of the guide groove so that the regulating member can be rotated, and a recording sheet abutting on the trailing edge of the recording sheet in the conveyance direction of the recording sheet The recording paper rear end abutting portion is formed integrally with the recording paper regulating member, thereby reducing the number of components and sliding the recording paper regulating member. By moving and rotating, a large range of movement of the recording paper trailing edge abutting portion in the recording paper conveyance direction is ensured, so that the recording paper trailing edge abutting portion can be reliably applied to the trailing edge of various sizes of recording paper. The posture of the trailing edge of the recording paper can be regulated by contacting the recording paper.

  According to a second aspect of the present invention, there is provided an image forming means for forming an image on a recording paper, a cabinet member covering the image forming means, and a cabinet member that can be freely opened and closed, and loaded with the recording paper in an open state. A paper feeding tray, a transporting means for sending the outermost of the recording paper loaded in the paper feeding tray, and transporting it to the image forming means; a paper feed tray substantially parallel to the paper feeding tray; A recording paper regulating member that is slidably movable in the transport direction and that contacts the rear end of the recording paper loaded in the paper feed tray and regulates the posture of the rear end of the recording paper during transport In the printer, the recording paper regulating member has a recording paper rear end abutting portion that comes into contact with the rear end of the recording paper at the rear end in the recording paper conveyance direction. It is formed integrally with the paper regulating member. It is obtained by reducing the goods number.

  According to a third aspect of the present invention, in the invention according to the second aspect, the recording paper rear end abutting portion includes a recording paper loading surface on which the recording paper is loaded and the recording paper loading surface of the recording paper regulating member. A pair of projections are provided on both sides of the opposite side of the recording paper, and the front end of the recording paper regulating member is rotatably supported on both sides in the width direction of the recording paper. A rotation shaft is projected, and the paper feed tray is provided on both side surfaces of the opening for accommodating the recording paper regulating member and the opening in the width direction of the recording paper. A pair of guide grooves for guiding the recording medium so as to be rotatable and slidable, and a lower edge of the guide groove when the paper feed tray is opened, and is projected to the recording paper regulating member side, A protruding end portion that engages with an edge portion of the recording paper regulating member on the opposite surface of the recording paper and that locks the recording paper regulating member The recording paper rear end abutting portion can be recorded in various sizes by ensuring a large range of movement of the recording paper rear end abutting portion in the recording paper conveyance direction by sliding movement and rotation of the recording paper regulating member. The rear edge of the recording paper can be regulated by securely contacting the rear edge of the paper.

  According to the first aspect of the present invention, since the recording paper rear end contact portion and the recording paper regulating member are integrally formed, the number of parts of the laser beam printer can be reduced, and the laser beam printer can be manufactured. Cost can be reduced. In addition, since the guide convex portion is formed so that the length dimension in the conveyance direction of the recording paper is longer than the length dimension in the direction orthogonal to the conveyance direction, the posture of the recording paper regulating member is properly maintained. However, it can be slid in the recording paper conveyance direction. Thus, even when the recording paper regulating member is slid according to the size of the recording paper, the rear end of the recording paper and the rear end of the recording paper can be accurately brought into contact with each other. The posture of the rear end can be properly regulated. Also, since the pair of notches are provided on the side surfaces of the guide groove, if the recording paper regulating member is slid and the guide convex portion and the notched portion are aligned, the recording paper regulating member is rotated. Interference between the guide convex portion and the side surface of the guide groove is avoided, and the recording paper regulating member can be smoothly rotated. The sliding movement and rotation of the recording paper regulating member can ensure a large movement range of the recording paper rear end abutting portion corresponding to recording papers of various sizes. The posture of the rear end of the recording paper can be regulated by reliably contacting the rear end.

  According to the second aspect of the present invention, since the recording paper rear end contact portion and the recording paper regulating member are integrally formed, the number of parts of the printer can be reduced and the manufacturing cost of the printer can be reduced. be able to.

  According to the third aspect of the present invention, the rotating shaft protrudes from the front end portion of the recording paper restricting member, and the guide grooves corresponding to the rotating shaft are provided on both side surfaces of the opening of the paper feed tray. The recording paper restricting member is slidable along the guide shaft, and can be rotated around the rotating shaft to be reversed. When the recording paper regulating member is reversed, the recording paper rear end abutting portion protruding from the opposite side of the recording paper can come into contact with the rear end of the recording paper. The sliding movement and rotation of the recording paper regulating member can ensure a large movement range of the recording paper rear end abutting portion corresponding to recording papers of various sizes. The posture of the rear end of the recording paper can be regulated by reliably contacting the rear end. In addition, since the projecting end portion that locks the recording paper restricting member is provided at the lower edge of the guide groove, the recording paper restricting member that is rotated about the rotation shaft is provided as a paper feed tray. Can be locked in a proper posture substantially in the same plane. In addition, when the paper feed tray is closed, one of the recording paper trailing edge contact portions protrudes outside the paper feeding tray. The tray can be easily opened.

(First embodiment)
A laser beam printer according to a first embodiment for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows a configuration example of the laser beam printer 1. The laser beam printer 1 is sequentially arranged around a photosensitive drum (image forming means) 2 having a photosensitive member coated on the surface thereof and from the upstream side to the downstream side in the rotation direction A around the photosensitive drum 2. Cleaner 3, charger (charging means) 4, laser exposure device (exposure means) 5, developing brush (developing means) 6, transfer roller (transfer means) 7, and transfer direction of recording paper P with respect to transfer roller 7 A fixing roller (fixing means) 8 disposed downstream of B, a paper feed tray 9 loaded with recording paper P, a paper discharge tray 10 on which printed recording paper P is deposited, and recording paper P A recording paper transport mechanism (transport means) 11 for transporting the recording medium is used. Each of the above components is mounted on a metal frame 13 disposed on the bottom of the laser beam printer 1 or the like. The metal frame 13 is mounted with a cabinet 14 that covers each of the above components and forms the exterior of the laser beam printer 1, and the upper portion thereof is for removing the recording paper P jammed in the recording paper transport mechanism 11 or A door member 15 for exchanging a toner cartridge 17 described later is provided so as to be freely opened and closed.

  The cleaner 3 removes toner and paper dust before one stroke (one rotation) adhering to the surface of the photosensitive drum 2 and cleans the drum surface. The charger 4 uniformly charges the surface of the photosensitive drum 2 cleaned by the cleaner 3. The laser exposure device 5 has a laser diode as a light source, and forms a latent image by irradiating the surface of the photosensitive drum 2 charged by the charger 4 while scanning the laser beam L. The laser exposure device 5 is supplied with power by a power supply device (not shown), and a light emission voltage for light emission of the laser diode is applied. The developing brush 6 is attached to a toner cartridge 17 filled with toner, and forms a toner image by attaching toner to a portion of the surface of the photosensitive drum 2 where a latent image is formed. The transfer roller 7 is provided so as to oppose the surface of the photosensitive drum 2, and charges the surface of the recording paper P while pressing the recording paper P against the surface of the photosensitive drum 2. The formed toner image is transferred onto the recording paper P. A transfer voltage for charging the surface of the recording paper P is applied to the transfer roller 7 from a power supply device. The fixing roller 8 sandwiches the recording paper P together with the rollers 18 arranged at opposite positions, and applies heat and pressure to the recording paper P to fix the toner. Heat for fixing the toner is supplied from a heater (for example, a halogen lamp) built in the fixing roller 8. A fixing voltage generated by a power supply device is applied to the heater.

  The recording paper transport mechanism 11 includes a pickup roller 11a, transport rollers 11b, 11c, and 11d, a paper stacking plate 20 that is disposed in the vicinity of the paper feed tray 9, and presses the loaded recording paper P against the pickup roller 11a. A metal coil spring 21 and the like for urging the paper stacking plate 20 toward the pickup roller 11a are provided.

  A recording paper placement surface 23 for placing the recording paper P is continuously formed by the paper feed tray 9 and the paper stacking plate 12. When the user inserts a plurality of recording papers P in a stacked state from the side of the paper feed tray 9, the recording papers P are placed on the recording paper placement surface 23.

  The pickup roller 11a is disposed to face the recording paper placement surface 23, and sends the uppermost recording paper P placed on the recording paper placement surface 23 to the transport roller 11b. The transport roller 11b sends the recording paper P sent out by the pickup roller 11a to the transport roller 11c. The transport rollers 11c and 11d are arranged so as to face each other between the transport roller 11b and the transfer roller 7, and transport the recording paper P sent out by the transport roller 11b to the transfer position.

  FIG. 2 shows the laser beam printer 1 with the paper feed tray 9 opened. The paper feed tray 9 is provided in the cabinet 14 so as to be openable and closable, and is loaded with recording paper. A recording paper regulating member 30 is incorporated on the upper surface side of the opened paper feed tray 9 to abut the rear end of the recording paper and regulate the posture of the rear end of the recording paper during conveyance. The recording paper regulating member 30 is provided so as to be slidable in the recording paper conveyance direction C substantially parallel to the paper feed tray 9. Further, as will be described later, the recording paper regulating member 30 is provided so as to be rotatable in the direction of arrow D about a guide convex portion 40 standing on the paper feed tray 9. A side edge regulating member (not shown) that abuts the side edge of the recording paper and regulates the side edge of the recording paper is provided near the side edge in the width direction of the recording paper loaded in the paper feed tray 9. It has been.

  3 and 4 show the paper feed tray 9 and the recording restricting member 30 in an enlarged manner. FIG. 3 shows the same state as FIG. 2, and FIG. 4 shows a state where the recording restricting member 30 is rotated by approximately 180 ° from the state shown in FIG. The paper feed tray 9 has a guide convex portion 40 erected substantially vertically from the tray surface. The guide convex portion 40 is formed so that the length dimension in the conveyance direction C of the recording sheet is longer than the length dimension in the direction orthogonal to the conveyance direction in order to guide the recording sheet regulating member 30 when sliding. Has been.

  The recording paper regulating member 30 has a guide groove 31 formed along the longitudinal direction of the guide convex portion 40, that is, the recording paper conveyance direction C. Due to the engagement between the guide convex portion 40 and the guide groove 31, the recording paper regulating member 30 is slid in the recording paper conveyance direction C while being guided. In addition, a pair of cutout portions cut out in a circular arc shape from the side surface of the guide groove 31 so that the recording paper regulating member 30 can rotate about the guide convex portion 40 as an axis at a substantially central portion of the guide groove 31. 32 is provided. When the recording paper regulating member 30 is rotated, by aligning the positions of the guide convex portion 40 and the notch portion 32, the side surface of the guide convex portion 40 and the side surface of the guide groove 31 are prevented from interfering with each other. The operation can be performed smoothly. Further, a recording paper rear end abutting portion 33 that abuts on the rear end of the recording paper is provided upright at the rear end of the recording paper regulating member 30 in the recording paper conveyance direction C. The recording paper trailing edge contact portion 33 contacts the trailing edge of the recording paper loaded in the paper feed tray 9 and regulates the posture of the recording paper trailing edge. The recording paper rear end contact portion 33 is formed integrally with the recording paper regulating member 30.

  When loading a large size recording paper into the paper feed tray 9, the user can slide the recording paper regulating member 30 in the direction of the arrow C1 from the state shown in FIG. Thereby, the recording paper trailing edge contact portion 33 can be extended further in the direction of the arrow C1 from the leading edge of the paper feed tray 9, and the posture of the trailing edge of the large size recording paper can be appropriately regulated.

  On the other hand, when loading a small size recording paper such as a postcard into the paper feed tray 9, the user slides the recording paper regulating member 30 in the direction of the arrow C2 from the state shown in FIG. And the notch 32 are aligned, and the recording paper regulating member 30 is rotated in the direction of the arrow D1, as shown in FIG. The paper regulating member 30 can be slid in the arrow C2 direction. As a result, the recording paper trailing edge abutting portion 33 can be brought close to the base end of the sheet feeding tray 9, that is, the vicinity of the cabinet 14, so that the posture of the trailing edge of the small size recording paper can be properly regulated. Become.

  As described above, according to the laser beam printer 1 of the first embodiment, the recording paper rear end contact portion 33 and the recording paper regulating member 30 are integrally formed. The number of points can be reduced, and the manufacturing cost of the laser beam printer 1 can be reduced. In addition, since the length dimension in the conveyance direction C of the guide convex portion 40 is formed to be longer than the length dimension in the direction orthogonal to the conveyance direction C, the posture of the recording paper regulating member 30 is properly maintained. However, it can be slid in the transport direction C. Thus, even when the recording paper regulating member 30 is slid according to the size of the recording paper, the rear end of the recording paper and the recording paper rear end abutting portion 33 can be brought into contact with each other accurately. It becomes possible to properly regulate the posture of the trailing edge of the paper. Further, since the pair of cutout portions 32 are provided on the side surfaces of the guide groove 31, the recording paper regulating member 30 is slid to align the guide convex portion 40 and the cutout portion 32, thereby guiding the guide. Interference between the convex portion 40 and the side surface of the guide groove 31 is avoided, and the recording paper regulating member 30 can be rotated. The slide movement and rotation of the recording paper regulating member 30 can ensure a large movement range of the recording paper rear end contact portion 33 corresponding to various sizes of recording paper. Can be reliably brought into contact with the trailing edge of the recording paper, and the posture of the trailing edge of the recording paper can be regulated.

(Second Embodiment)
A laser beam printer according to a second embodiment for carrying out the present invention will be described with reference to the drawings. This printer differs from the laser beam printer of the first embodiment in the configuration of the paper feed tray and the recording restricting member. FIG. 5 shows an enlarged view of the paper feed tray 45 and the recording restricting member 50 of the printer. The paper feed tray 45 has an opening 46 for accommodating the recording paper regulating member 50. The recording paper regulating member 50 is attached to the opening 46 so as to be substantially flush with the paper feed tray 45. At the rear end portion of the recording paper regulating member 50 in the recording paper conveyance direction C2, recording paper rear end abutting portions 51 and 52 that abut the rear end of the recording paper are provided upright. The recording paper rear end contact portions 51 and 52 are provided on both sides of the recording paper loading surface 53 on which the recording paper is loaded and the recording paper opposite surface 54 opposite to the recording paper loading surface 53 of the recording paper regulating member 50. Projected. The recording paper rear end contact portions 51 and 52 are formed integrally with the recording paper regulating member 50. On the other hand, at the front end of the recording paper regulating member 50, a pair of rotating shafts 55 for projectingly supporting the recording paper regulating member 50 in the direction of arrow E are provided on both sides in the width direction of the recording paper. Has been.

  On both side surfaces of the opening 46 in the width direction of the recording paper, guide grooves 47 are provided for guiding the rotation shaft 55 of the recording paper regulating member 50 so as to be rotatable in the direction of arrow E and slidably movable in the direction of arrow C. It has been. Further, in FIG. 5, the lower end edge of the guide groove 47 protrudes toward the recording paper regulating member 50 and engages with the edge of the recording paper opposite surface 54 of the recording paper regulating member 50. A portion 48 is provided. The recording paper regulating member 50 is locked to the paper feed tray 45 in a substantially flush position by the protruding end 48.

  When loading a large size recording paper into the paper feed tray 45, the user can slide the recording paper regulating member 50 in the direction of arrow C1 from the state shown in FIG. As a result, the recording paper trailing edge contact portion 51 can be extended further in the direction of the arrow C1 from the leading edge of the paper feed tray 9, and the posture of the trailing edge of the large size recording paper can be regulated appropriately.

  On the other hand, when a small size recording paper such as a postcard is loaded in the paper feed tray 45, the user slides the recording paper regulating member 50 in the direction of the arrow C1 from the state shown in FIG. The recording paper regulating member 50 can be reversed by rotating in the E1 direction, and the recording paper regulating member 50 can be slid in the arrow C2 direction. As a result, the recording paper trailing edge contact portion 52 can be brought close to the base end of the paper feed tray 45, that is, the vicinity of the cabinet 14, and the posture of the trailing edge of the small size recording paper can be regulated appropriately.

  As described above, according to the laser beam printer of the second embodiment, the recording paper rear end abutting portions 51 and 52 are formed integrally with the recording paper regulating member 50. Can be reduced, and the manufacturing cost of the printer can be reduced. Further, since the rotation shaft 55 protrudes from the front end portion of the recording paper regulating member 50 and the guide grooves 47 corresponding to the rotation shaft 55 are provided on both side surfaces of the opening 46 of the paper feed tray 45. The recording paper regulating member 50 is slidably movable along the guide groove 47 and is rotatable about the rotation shaft 55 to be reversed. When the recording paper regulating member 50 is reversed, the recording paper rear end contact portion 52 protruding from the recording paper opposite surface 54 can come into contact with the rear end of the recording paper. Accordingly, it is possible to secure a large movement range of the recording paper trailing edge contact portions 51 and 52 corresponding to recording papers of various sizes, and the recording paper trailing edge contact portion 51 or 52 at the trailing edge of the recording paper. The posture of the trailing edge of the recording paper can be regulated by reliably contacting it. Further, since a protruding end portion 48 for locking the recording paper restricting member 50 is provided at the lower edge of the guide groove 47, the recording paper restricting member 50 rotated around the rotation shaft 55 is provided. Can be locked to the paper feed tray 45 in an appropriate posture substantially in the same plane. Further, when the paper feed tray 45 is closed, one of the recording paper trailing edge abutting portions 51 or 52 protrudes outside the paper feeding tray 45, so that the recording paper trailing edge abutting portion 51 or 52 is pinched. By pulling out as a part, the paper feed tray 45 can be easily opened.

  The present invention is not limited to the configuration of the above-described embodiment, and various modifications can be made. For example, the recording paper transport mechanism 11 is not limited to the laser beam printer 1 and can be applied to other printers such as an ink jet printer. Is also applicable. Further, the shapes of the paper feed trays 9 and 45 and the recording restriction members 30 and 50 are not limited to those shown in FIGS. For example, in FIGS. 3 and 4, a flange for preventing the recording restricting member 30 from falling off may be formed at the tip of the guide protrusion 40.

The figure which shows the structure of the laser beam printer by one Embodiment of this invention. The perspective view which shows the laser beam printer of the state which open | released the paper feed tray. The perspective view which expanded and showed the paper feed tray and the recording paper control member. The perspective view which expanded and showed the paper feed tray and recording paper control member in the state where the recording paper control member was rotated. The perspective view which expanded and showed the paper feed tray and recording paper control member of the laser beam printer by another embodiment of the present invention. The perspective view which shows the conventional laser beam printer of the state which open | released the paper feed tray.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laser beam printer 2 Photosensitive drum 4 Charger (charging means)
5 Laser exposure equipment (exposure means)
6 Developing brush (Developing means)
7 Transfer roller (transfer means)
8 Fixing roller (fixing means)
9 Paper feed tray 11 Recording paper transport mechanism (transport means)
11a Pickup roller 14 Cabinet 30 Recording paper restricting member 31 Guide groove 32 Notch 33 Recording paper rear end contact part 40 Guide convex part 45 Paper feed tray 46 Opening 47 Guide groove 48 Projecting end part 50 Recording restricting member 51, 52 Recording Paper rear edge contact part 55 Rotating shaft

Claims (3)

A photoreceptor drum having a photoreceptor coated on the surface;
Charging means for uniformly charging the surface of the photosensitive drum;
Exposure means for forming a latent image by irradiating the surface of the photoconductor while scanning with a laser beam;
Developing means for forming a toner image by attaching toner to a portion of the surface of the photoreceptor where a latent image is formed;
At a predetermined transfer position downstream of the developing means in the rotational direction of the photosensitive drum, the photosensitive drum is provided to face the surface of the photosensitive drum, and the surface of the recording paper is charged to Transfer means for transferring the toner image formed on the surface onto the recording paper;
Fixing means for applying a predetermined heat and pressure to the recording paper on which the toner image has been transferred to fix the toner image on the recording paper;
A cabinet member covering each of the above means;
A paper feed tray that is freely openable and closable on the cabinet member and is loaded with recording paper,
Out of the recording paper loaded in the paper feed tray, the outermost one is transported and transported to the transfer position;
Provided substantially parallel to the paper feed tray and slidably movable in the recording paper conveyance direction, abutting the rear edge of the recording paper loaded in the paper supply tray, and the rear edge of the recording paper during conveyance In a laser printer provided with a recording paper regulating member that regulates the attitude of
The paper feed tray is erected so as to be substantially perpendicular to the tray surface and have a length dimension in the conveyance direction of the recording paper longer than a length dimension in a direction perpendicular to the conveyance direction. A guide protrusion for guiding the recording paper regulating member;
The recording paper restricting member includes a guide groove with which the guide convex portion is engaged, and the guide groove so that the recording paper restricting member can rotate about the guide convex portion in a part of the guide groove. A pair of cutout portions cut out in an arc shape from the side surface of the recording paper, and a recording paper rear end abutting portion that comes into contact with the rear end of the recording paper at the rear end portion in the recording paper conveyance direction,
The recording paper rear end contact portion is formed integrally with the recording paper regulating member,
Thereby, while reducing the number of parts, by ensuring a large movement range in the recording paper conveyance direction of the recording paper rear end contact portion by sliding movement and rotation of the recording paper regulating member, A laser beam printer, characterized in that the trailing edge of the recording paper can be surely brought into contact with the trailing edge of recording paper of various sizes to regulate the posture of the trailing edge of the recording paper. Image forming means for forming an image on recording paper;
A cabinet member covering the image forming means;
A paper feed tray that is freely openable and closable on the cabinet member and is loaded with recording paper,
Out of the recording paper loaded in the paper feed tray, the outermost one is transported and transported to the image forming unit;
Provided substantially parallel to the paper feed tray and slidably movable in the recording paper conveyance direction, abutting the rear edge of the recording paper loaded in the paper supply tray, and the rear edge of the recording paper during conveyance In a printer provided with a recording paper regulating member that regulates the attitude of
The recording paper regulating member has a recording paper rear end abutting portion that abuts the rear end of the recording paper at the rear end in the recording paper conveyance direction,
The recording paper trailing edge contact portion is formed integrally with the recording paper regulating member,
As a result, the number of parts is reduced. The recording paper rear end contact portion protrudes from both the recording paper loading surface of the recording paper regulating member and the recording paper opposite surface opposite to the recording paper loading surface.
At the front end of the recording paper regulating member, a pair of pivot shafts for projectingly supporting the recording paper regulating member is provided on both side surfaces in the width direction of the recording paper,
The paper feed tray is provided at an opening for accommodating the recording paper restricting member, and at both side surfaces of the opening in the width direction of the recording paper, and a rotation shaft of the recording paper restricting member is rotatable. A pair of guide grooves for slidably guiding, and protruding from the lower edge of the guide groove when the paper feed tray is opened toward the recording paper regulating member, the recording paper regulating member Engaging the edge of the opposite surface of the recording paper, and having a protruding end for locking the recording paper regulating member,
By sliding and rotating the recording paper regulating member, the recording paper rear end abutting portion is secured in a wide range of movement in the recording paper conveyance direction, so that the recording paper rear end abutting portion can be of various sizes. 3. The printer according to claim 2, wherein the posture of the rear end of the recording paper can be regulated by reliably contacting the rear end of the recording paper.

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