KR100485815B1 - Apparatus for transferring print paper, and printer having transferring apparatus and transfferring method thereof - Google Patents

Abstract

The present invention relates to a paper conveying apparatus, a printer having such a paper conveying apparatus, and a paper conveying method thereof. A main body case having a paper outlet, a paper cassette detachable from the main body case, a transfer casing for forming a paper transfer path between the paper cassette and the paper discharge port in the main body case, and an outdoor having access to the paper transfer path of the transfer casing; The paper conveying apparatus is provided with a pickup roller for picking up the paper in the paper cassette to the paper conveying path, and a feed roller for delivering the paper provided from the paper conveying path toward the paper discharge port. The feed roller for feeding the paper to the feed roller is installed in the outdoor. According to this, the volume and especially the height of the whole machine can be greatly reduced, and the feed roller can be intermittently transferred to the paper feed path in conjunction with the rotational direction of the feed roller, thereby reducing the feed loss of the printing paper as much as possible.

Description

A paper conveying apparatus, a printer having such a paper conveying apparatus, and a method of conveying the same, and a paper conveying method.

The present invention relates to a paper conveying apparatus, a printer having such a paper conveying apparatus, and a paper conveying method thereof. In particular, a feed roller is installed in the outdoor of a FIFO (Front In Front Out) type inkjet printer and the feed roller is operated. The present invention relates to a paper feed apparatus of a printer which is intermittently operated by a printer, a printer having such a paper feed apparatus, and a paper feed method thereof.

As shown in FIG. 1, the conventional inkjet printer 100 includes a paper conveying apparatus 110 that picks up paper loaded in the paper cassette 3 and transports the paper toward the print head 7. The conventional paper conveying apparatus 110 includes a conveyance casing (see 30 in FIG. 2) which forms a sheet conveying path 5 between the paper cassette 3 and the print head 7 along its outer surface, A pickup roller 31, a feed roller 71, and a feed roller 35, which are installed along the outer surface, that is, along the paper feed path 5, are provided.

The feed roller 35 is rotatable in the forward and reverse directions by the rotary motor 11 (see FIG. 2). The rotary motor 11 is composed of an LF (Line Feed) motor for rotating the feed roller 35 at regular intervals. That is, the LF motor 11 rotates the feed roller 35 at a line interval in which the print head can reciprocate once in the transverse direction of the paper. In order to control the LF motor 11, a sensor for detecting the rotation angle of the feed roller 71 and a control unit for controlling the LF motor based on a detection signal from the sensor are provided.

On the other hand, the pickup roller 31 and the transfer roller 71 are each capable of power transmission or the rotation of a separate drive motor is interposed between the feed gear 35 and the swing gears or one-way clutch spring. On the other hand, the feed roller 71 is in contact with the opposite pinch roller 37 with the paper feed path 5 therebetween. The pinch roller 37 is pressurized inward by the pinch spring 38 to be in contact with the feed roller 71.

By such a configuration, when the rotary motor 11 rotates the feed roller 35 in one direction, that is, in the reverse direction with respect to the rotational direction in which paper is delivered (hereinafter referred to as delivery rotation), the rotational force of the feed roller 35 is increased. It is transmitted to the pickup roller 31 through swing gears or one-way clutch spring. Thereby, the sheets stacked in the paper cassette 3 are picked up by the sheet conveying path 5 one by one. On the other hand, simultaneously with the pickup rotation of the pickup roller 31, the feed roller 71 rotates in the reverse direction with respect to the rotational direction of the feed roller 35. Thus, the paper picked up by the pickup roller 31 is fed toward the feed roller 35.

When the sheet conveyed by the feed roller 71 is provided to the feed roller 35 in this way, the rotary motor 11 rotates the feed roller 35 in the delivery direction. Here, of course, the feed roller 35 is rotated at line intervals as described above. On the other hand, the power of the pickup roller 31 is cut off at the same time that the paper is provided to the feed roller 35 or at the same time as the feed roller 35 is rotated. At this time, the feed roller 71 maintains its rotation state. Then, the pickup of the paper is temporarily stopped, but the picked paper is delivered by the feed roller 71 and the feed roller 35 which rotate continuously.

By the way, in the conventional printer 100 and the paper conveying apparatus 110 installed in the printer 100, a configuration in which a plurality of rollers, that is, a pickup roller, a conveying roller, and a feed roller, must be incorporated in a limited space of the conveying casing. On the other hand, it is difficult to arrange to avoid contact or interference between them, and on the other hand, even if an organic combination of each roller and related parts is inevitably secured, a minimum mounting space is inevitably secured. There is a problem that must be increased in height.

In the conventional printer 100 and the paper feed apparatus 110 installed in the printer 100, even if the rotational speeds of the feed roller and the feed roller are controlled equally, the friction coefficient of the feed roller and the feed roller is substantially different. The rotational speed is different due to mechanical errors such as back lash, which is inevitable in the power transmission portion between the motor and the feed roller or feed roller. In this case, the paper to be fed is subjected to a tensile force or a compressive force in the sheet surface direction, which in turn causes a transfer loss of the printing paper and degrades the quality of the printed image.

Therefore, in view of these problems in the related art, the present invention provides a paper feed apparatus of a printer which can significantly reduce the volume and especially the height of the whole machine by improving the mounting position of each roller and their related parts, in particular, the transfer roller, and A printer having a paper conveying apparatus and a paper conveying method thereof are provided.

Another object of the present invention, the paper feed device of the printer to reduce the feed loss of the printing paper by the feed roller intermittently approached the paper feed path in conjunction with the rotational direction of the feed roller, and such paper transport The present invention provides a printer having a device and a method of transferring the paper.

Still another object of the present invention is to provide a paper feeder capable of intermittently operating and intermittently rotating and vertically rotating a feed roller, a pick-up roller, and a feed roller by a single motor, a printer having such a paper feed device, and a paper thereof. It is to provide a transfer method.

The object is to provide a main body case having a paper discharge port, a paper cassette detachable from the main body case, a transfer casing for forming a paper transfer path between the paper cassette and the paper discharge port in the main body case, and a paper transfer path of the transfer casing. A paper conveying apparatus of a printer having an outdoor having a close proximity to a paper, comprising: a pickup roller rotatably installed at the conveying casing adjacent to the paper cassette to pick up the paper in the paper cassette to the paper conveying path; A feed roller rotatably installed in the transfer casing adjacent to the paper discharge port to deliver paper provided from the paper transport path toward the paper discharge port; And a conveying roller installed in the outdoor and conveying the paper picked up by the pick-up roller to the feed roller.

Here, the rotary motor for forward and reverse rotation of the feed shaft of the feed roller; A feed roller drive unit comprising a plurality of gears engaged between the feed shaft of the feed roller and the feed shaft of the feed roller; And means interposed between the drive unit and the feed shaft of the feed roller to move the feed roller closer to the paper feed path in association with the rotational direction of the feed roller.

At this time, the feed roller access transfer means, the drive shaft is installed in the outdoor so as to be parallel to the feed shaft of the feed roller, to transfer the rotational force from the feed roller drive unit to the feed shaft of the feed roller; A hinge housing interposed between the drive shaft and the feed shaft of the feed roller to rotate the feed roller close to the paper feed path about the drive shaft when the feed roller is rotated in a delivery direction; And a rotation limiting means for limiting the rotational position in which the transfer roller has access to the paper conveying path.

And, the rotation limiting means, the opening which is opened in the outdoor to expose the hinge housing rotatably; An opening protrusion protruding from one edge of the opening toward the other side and contacting the hinge housing when the feed roller approaches the paper feed path; And a housing protrusion protruding from the hinge housing to engage with the edge of the opening portion at the time of half rotation of the feed roller from the hinge housing.

Here, the feed roller access transfer means, the housing rotating body which is rotatably installed on the drive shaft at predetermined intervals with the hinge housing; And a friction member interposed between the housing pivot and the hinge housing to transfer the rotational force of the housing pivot to the hinge housing.

The paper feed apparatus of the printer further includes: a pickup roller unit interposed so as to be capable of power transfer between the drive unit and the pickup shaft of the pickup roller; And, in association with the rotational direction of the feed roller, means for bringing the pick-up roller closer to the paper loaded in the paper cassette.

On the other hand, the object of the present invention is to provide a main body case having a paper discharge port, a paper cassette detachable to the main body case, a transfer casing for forming a paper transfer path between the paper cassette and the paper discharge port in the main body case, and the paper of the transfer casing. A printer having an outdoor approaching a transfer path, the printer comprising: a pickup roller rotatably installed at the transfer casing adjacent to the paper cassette to pick up the paper in the paper cassette to the paper transfer path; A feed roller rotatably installed in the transfer casing adjacent to the paper discharge port to deliver paper provided from the paper transport path toward the paper discharge port; And it may be achieved by a printer comprising a paper conveying apparatus installed in the outdoor and having a feed roller for transferring the paper picked up from the pickup roller to the feed roller.

The object of the present invention is a paper feed method of a printer comprising a feed roller and a pickup roller installed to rotate in opposite directions to the transfer casing, and a feed roller installed in an outdoor where the transfer casing is accessible. Rotating the roller against the delivery direction of the paper; At the reverse rotation of the feed roller, picking up the paper by approaching the paper loaded in the paper cassette, and simultaneously transporting the paper by moving the feed roller to the paper feed path; If the conveyed paper is provided to the feed roller, rotating the feed roller in a delivery direction; And at the time of the delivery rotation of the feed roller, transferring the pickup roller with respect to the paper and simultaneously conveying the feed roller with respect to the paper feed path.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. At this time, the same reference numerals are assigned to the same configurations and names as those in FIG. 1 described above with reference to the related art.

Fig. 2 is a perspective view of a main part of a printer having a paper conveying apparatus according to the present invention, and Figs. As can be seen from these figures, the printer 1 is provided with a removable paper cassette (refer to 3 in FIG. 1) at the bottom of the main body case in which a paper discharge port (not shown) is formed. The main body case has an upward and downward pivotal approach to the transfer casing 30 forming the paper transfer path 5 between the paper cassette 3 and the paper discharge port, and the paper transfer path 5 formed by the transfer casing 30. On the contrary, the outdoor 70 is installed.

On the other hand, the printer 1 transfers the paper in the paper cassette 3 along the paper feed path 5 between the transfer casing 30 and the outdoor 70, as described with reference to FIG. 1 in the related art. The paper conveying apparatus 10 is mounted. Figure 5 is a perspective view of the paper conveying apparatus according to the present invention built into the printer as the main perspective view of Figure 2, Figure 6 is a side view of the state of the transfer casing of Figure 3 and the outdoor of Figure 4 combined.

As can be seen from the drawing, the paper conveying apparatus 10 includes a pickup roller 31 and a feed roller 35 provided in the feed casing 30, and a feed roller 71 provided in the outdoor 70. It includes. In such a configuration in which the feed roller 71 is installed in the outdoor 70, as will be described later in detail, the installation space of the feed roller 71 can be removed from the feed casing 30, thereby reducing its volume, in particular, its height. have. In such a configuration, the volume of the printer 1 to which the transfer casing 30 is mounted can also be reduced, which is preferable.

The pickup roller 31 is integrally rotatable by being coupled to the pickup shaft 31 in the horizontal direction adjacent to the pickup roller 31 at the lower portion of the transfer casing 30. The feed roller 35 is integrally rotatable by being coupled to the feed shaft 36 in the horizontal direction adjacent to the print head 7 on top of the transfer casing 30. The feed casing 30 in which the pickup roller 31 and the feed roller 35 are installed extends vertically upward from the top of the pickup roller 31, and then the paper feed path curved in the horizontal direction toward the feed roller 35 ( 5). The transfer roller 71 provided in the outdoor 70 in the curved part 6 of this paper conveyance path 5 is carried away as mentioned later.

And, the feed roller 71 is coupled to the feed shaft 72 provided in parallel with the feed shaft 36 in the outdoor 70 is rotatable integrally. Here, the outdoor 70 pivotally moves upward and downward with respect to the paper conveying path 5 of the conveying casing 30 with the engaging projections 78 protruding outwardly into the lower regions of the flange portions 77 on both sides thereof. do. After opening the outdoor 70, the paper stopped on the paper conveying path 5, that is, the paper on which the jam has occurred can be discharged to the outside. The outdoor 70 is further provided with a plurality of passage holes 79 for partially passing the feed roller 71 along the inner surface corresponding to the paper feed path 5.

Referring to the drawings, the reduction gears 12 and the timing belt 13 are coupled between the feed shaft 36 of the feed roller 35 and the drive shaft of the LF motor 11. As a result, the reduced driving force of the LF motor 11 is transmitted to the feed roller 35, so that the feed roller 35 is rotatable with a line interval.

Between the feed shaft 36 of the feed roller 35 and the feed shaft 72 of the feed roller 71, a feed roller drive unit 80 for transmitting the rotational force of the feed shaft is interposed. Then, between the drive unit 80 and the transfer roller 71, the transfer roller 71 is approached with respect to the paper feed path 5 of the transfer casing 30 through the through hole 79 of the outdoor 70. Feed roller access half section 90 is installed. Then, the power transmission pickup roller unit 40 and the pickup roller 31 between the rotary shaft 61 of the central gear 82 and the pickup shaft 32 of the pickup roller 31 which will be described later in detail in the drive unit 80. Is provided with a pickup roller access half portion 50 which allows the transfer of access to the paper stacked in the paper cassette 3.

The feed roller drive unit 80 includes a feed gear 37 coupled to the feed shaft 36, an end gear 84 installed on the bent portion 6 of the feed casing 30 so as to be idlely rotated, and a feed gear 37. ) Is interposed between the central gear 82 and the central gear 82 and the feed gear 37 and the central gear 82 and the end gear 84, respectively, provided with a separation distance between the end gear 84 and the end gear 84, respectively. First and second idle gears 81 and 83 are provided. Here, the drive gear is installed in the outdoor 70, and transmits the rotational force of the end gear 84 to the feed shaft 72 of the feed roller 71 through the shaft gear 85 of the drive shaft 91 ( 86 and driven gear 87 may be further included.

On the other hand, the feed roller access half 90 provided in the outdoor 70, the drive shaft 91, the drive shaft 91 and the feed shaft arranged in parallel with the feed shaft 72 of the feed roller 71 A hinge limiting unit (92) capable of pivoting up and down the drive shaft (91) integrally with the feed roller (71) by combining the (72) integrally and the hinge housing (93). ). To the end of the drive shaft 91 is coupled to the end gear 84 of the feed roller drive unit 80 and the toothed shaft gear 85. The drive shafts 86 and the driven gears 87 are coupled to the feed shafts of the drive shaft 91 and the feed rollers 71, respectively, to allow power transmission.

The hinge housing 93 has two pairs of receiving ribs 95 protruding from both ends thereof in the longitudinal direction to face each other. An accommodation hole is formed in each accommodation rib 95 to accommodate the drive shaft 91 and the feed shaft 72 in a rotatable state in parallel. A housing pivot 98 is rotatably coupled to the outside of the hinge housing 93, that is, the drive shaft 91, and a friction member 99 between the housing pivot 98 and the hinge housing 93. ) Is intervened.

Here, the friction member 99 can be simply configured with an elastic spring. The elastic spring 99 is preferably interposed between the drive shaft 91 and the hinge housing 93 in a compressed state. The elastic spring 99 transmits a frictional force to the hinge housing 93 with the housing pivot 98 which rotates integrally with the driving shaft 91. As a result, the hinge housing 93 can move the feed roller 71 closer to the paper feed path 5 of the feed casing 30, while being rotated forward and backward in conjunction with the rotational direction of the feed roller 35.

And, as shown in more detail in FIG. 7, the pivot limiting part 92 of the hinge housing 93 is opened in the outdoor 70 to open the hinge housing 93 so as to be rotatable. ), A plurality of opening protrusions 97 protruding from one longitudinal edge of the opening 96 toward the other side, and a pair of housing protrusions projecting outwardly at regular intervals along one longitudinal edge of the hinge housing 93 ( 94). The opening protrusion 97 contacts the hinge housing 93 to prevent the rotation of the feed roller 71 when the feed roller 71 approaches the paper feed path 5 through the through hole 79 of the outdoor 70. . Then, the housing protrusion 94 is engaged with the edge of the opening 96 of the outdoor 70 to prevent rotation of the hinge housing 93 at the time of half rotation with respect to the paper feed path 5 of the feed roller 71.

On the other hand, the pick-up roller unit 40 is a plurality of connecting the power transfer between the rotary shaft 61 of the center gear 82 of the feed roller drive unit 80 and the pickup shaft 32 of the pickup roller 31 so as to enable power transfer. Gears 41, 42, 43. Detailed description of these plurality of gears 41, 42, 43 will be omitted.

Then, the access half 50 for carrying the pick-up roller 31 closer to the paper loaded in the paper cassette includes an upper housing 51, an upper housing 51, and a pickup roller 31 which integrally cover the outer surfaces of the gears. A lower housing 52 interposed between the pickup shafts 32 of the pickup shaft, and a pickup roller support arm 53 having one end coupled to the rotation shaft (not shown) and the other end coupled to the pickup shaft 32 of the pickup roller 31. Include. The engaging portions of these upper housings 51, the lower housings 52, and the pick-up roller support arms 53 each form a joint that can be relatively rotatable about a mutual cavity axis. As a result, the pickup roller 31 is accessible to the paper loaded in the paper cassette 3 in association with the rotational direction of the feed roller 35.

Hereinafter, the operations of the present paper conveying apparatus and the printer employing such a paper conveying apparatus will be described with reference to the flowchart of FIG. 8.

When a print command is applied (S1), first, the rotary motor 11 is driven to rotate the feed roller 35 in the reverse direction of the delivery rotation direction (S2). Then, the drive shaft 91 received power through the feed roller drive unit 80 is rotated, at this time, the hinge housing 93 in contact with the housing rotating body 98 via the friction member 99 is Rotate downward. The downward rotation of the hinge housing 93 is prevented by the opening projection 97 of the opening 96, but at this rotation restriction position, the feed roller 71 transfers the casing through the through hole 79 of the outdoor 70. The outer surface 30 is in contact with the paper feed path 5 (S3). The reverse rotational power of the feed roller 35 is also transmitted to the pickup roller unit 40 so that the pickup roller 31 rotates downward to contact the paper loaded in the paper cassette 3 (S4).

The reverse rotation of the feed roller 35, on the other hand, pick-up rotation of the pickup roller 31 connected by engaging the plurality of gears 41, 42, 43 in the same direction (S5). Then, the pickup of the sheet is performed by the pickup roller 31 which picks up and rotates in the state where the sheet is in contact with the sheet. At the same time, the feed roller 71 is rotated in the opposite direction to the feed roller 35, that is, in the direction to feed the paper (S6). Thereby, the paper picked up by the pickup roller 31 and moved along the paper feed path 5 is conveyed toward the feed roller 35 by the rotational force between the feed roller 71 and the pinch roller 65.

Here, in the flow chart of Figure 8, in order to facilitate the explanation and understanding of the paper conveying method according to the present invention, although the steps are described in sequence, the mechanically coupled feed roller 35, pickup roller 31, And the feed roller 71, the driving of the rotary motor 11, the operation of the above-described steps proceed almost simultaneously. In other words, when the feed roller 31 starts to rotate in reverse, the downward rotation of the pickup roller 31 and the feed roller 71 and the rotation in the corresponding direction are performed at substantially the same time.

The reverse rotation of the feed roller 35 proceeds continuously until the tip of the sheet fed from the feed roller 71 touches the adjacent rear side (S7). On the other hand, when the leading end of the paper touches the feed roller 35, the feed roller 35 is rotated in the delivery direction (S8). Then, the feed roller 71 and the pick-up roller 35 are rotated upwards (S9 and S10), respectively, and are carried out with respect to the paper feed path 5 and the paper cassette 3. Thereby, the pickup and the conveyance of the paper are temporarily stopped, and at this time, the pickup roller 35 and the feed roller 71 rotate in the opposite directions of the pick-up rotation and the feed rotation direction, respectively.

In this state, the feed roller 35 is rotated and delivered at line intervals to supply the paper to the print head, and the print head 7 performs the print job. Then, when the rear end of the paper leaves the feed roller 35 (S13), the operation of the feed roller 35 in the above-described order is repeated based on whether the print command is applied (S1).

Meanwhile, in the above-described and illustrated embodiments, a method of conveying paper while intermittently operating the feed rollers, the pick-up rollers, and the feed rollers using a single motor has been described, but the operation of the feed rollers and the pick-up rollers is integrated. The paper conveying method is also applied to a paper conveying apparatus having a motor for intermittent operation and a pick-up roller, or a paper conveying apparatus having a motor for driving each roller individually. Of course, the effect can be achieved.

As described above, according to the present invention, there is provided a paper conveying apparatus which can greatly reduce the volume and especially the height of the whole machine by improving the mounting position of each roller and its related parts, in particular, the conveying roller, and such a paper conveying apparatus. A printer and a paper conveying method thereof are provided.

In this paper feed device, a printer having such a paper feed device, and a paper feed method thereof, the feed roller can be intermittently transferred to the paper feed path in association with the rotational direction of the feed roller, thereby maximizing the feed loss of printing paper. It is possible to reduce, thereby solving the problem of image defects that may occur during a print job by the printhead.

According to the present invention, there is also provided a paper conveying apparatus capable of integrally intermitting rotation and vertical rotation of a feed roller, a pick-up roller, and a feed roller by a single motor, a printer having such a paper conveying apparatus, and a paper conveying method thereof. Is also provided.

1 is a schematic configuration diagram of a printer having a conventional paper feed apparatus;

Figure 2 is a perspective view of the main portion of the printer having a paper transport apparatus according to the present invention,

3 and 4 are exploded views of FIG. 2 and shown as perspective views of the transfer casing and the outdoor, respectively;

5 is a perspective view of the main portion of Figure 2, a perspective view of a paper conveying apparatus according to the present invention embedded in a printer,

FIG. 6 is a side view of the transfer casing of FIG. 3 and the outdoor of FIG.

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 4, more specifically illustrating the hinge housing; and

8 is a flowchart illustrating a paper transfer method of a paper transfer apparatus and a printer having the same according to the present invention.

<Description of main parts of drawing>

1: printer 3: paper cassette

5: paper feed path 7: printhead

10: paper feed device 11: rotary motor

30: transfer casing 31: pickup roller

32: pickup shaft 35: feed roller

36: feed shaft 40: pickup roller unit

50: pickup roller access half 53: pickup roller support arm

70: outdoor 71: feed roller

72: feed shaft 80: feed roller drive unit

90: feed roller approach half 91: drive shaft

92: limit of rotation 93: hinge housing

94: housing projection 96: opening

97: opening protrusion

Claims (8)

Access to a main body case having a paper discharge port, a paper cassette detachable to the main body case, a transfer casing forming a paper transfer path between the paper cassette and the paper discharge port in the main body case, and a paper transfer path of the transfer casing. In the paper conveying apparatus of the printer provided with the opposite outdoor, A pickup roller rotatably installed in the transfer casing adjacent to the paper cassette to pick up the paper in the paper cassette to the paper transport path; A feed roller rotatably installed in the transfer casing adjacent to the paper discharge port to deliver paper provided from the paper transport path toward the paper discharge port; And A feed roller installed in the outdoor to transfer the paper picked up from the pickup roller to the feed roller, the feed roller intermittently approaching the paper feed path in association with the rotational direction of the feed roller; Conveying device. The method of claim 1, A rotating motor for forward and reverse rotation of the feed shaft of the feed roller; A feed roller drive unit comprising a plurality of gears engaged between the feed shaft of the feed roller and the feed shaft of the feed roller; And Interposed between the drive unit and the feed shaft of the feed roller, the paper feed of the printer further comprising means for moving the feed roller to and from the paper feed path in association with the rotational direction of the feed roller. Device. The method of claim 2, The transfer roller access transfer means, A drive shaft installed in the outdoor body so as to be parallel to the feed shaft of the feed roller, and transmitting a rotational force from the feed roller drive unit to the feed shaft of the feed roller; A hinge housing interposed between the drive shaft and the feed shaft of the feed roller to rotate the feed roller close to the paper feed path about the drive shaft when the feed roller is rotated in a delivery direction; And  And a rotation limiting means for limiting an access rotational position of the conveying roller to the paper conveying path. The method of claim 3, wherein The rotation limit means, An opening that is opened in the outdoor to rotatably expose the hinge housing; An opening protrusion protruding from one edge of the opening toward the other side and contacting the hinge housing when the feed roller approaches the paper feed path; And And a housing protrusion protruding from the hinge housing to engage with the edge of the opening portion when the transfer roller is pivoted from the hinge housing. The method according to claim 3 or 4, The transfer roller access transfer means, A housing pivot installed on the drive shaft so as to be integrally rotatable at predetermined intervals from the hinge housing; And And a friction member interposed between the housing pivot and the hinge housing to transfer the rotational force of the housing pivot to the hinge housing. The method of claim 2, A pickup roller unit interposed so that power can be transmitted between the drive unit and the pickup shaft of the pickup roller; And And means for shifting the pick-up roller relative to the paper loaded in the paper cassette in association with the rotational direction of the feed roller. Access to a main body case having a paper discharge port, a paper cassette detachable to the main body case, a transfer casing forming a paper transfer path between the paper cassette and the paper discharge port in the main body case, and a paper transfer path of the transfer casing. In the printer provided with the outdoor, A pickup roller rotatably installed in the transfer casing adjacent to the paper cassette to pick up the paper in the paper cassette to the paper transport path; A feed roller rotatably installed in the transfer casing adjacent to the paper discharge port to deliver paper provided from the paper transport path toward the paper discharge port; And a feed roller installed in the outdoor to transfer the paper picked up from the pickup roller to the feed roller, the feed roller intermittently approaching the paper feed path in association with the rotational direction of the feed roller. Configured printer, including. In the paper conveying method of the printer having a feed roller and a pickup roller installed to rotate in opposite directions to the conveying casing, and a conveying roller installed in the outdoor to the access casing, Rotating the feed roller counter to the direction of delivery of the paper; At the reverse rotation of the feed roller, picking up the paper by approaching the paper loaded in the paper cassette, and simultaneously transporting the paper by moving the feed roller to the paper feed path; If the conveyed paper is provided to the feed roller, rotating the feed roller in a delivery direction; And And a step of transferring said pick-up roller with respect to said paper at the same time as said feed roller rotates, and said transfer roller with respect to said paper feed path.