JP4059945B2 - Recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a record apparatus that have a discharge mechanism of the recorded recording medium, particularly, an ink jet recording apparatus. The present invention also relates to simplification of the recording paper transport mechanism.
[0002]
[Prior art]
The ink jet recording apparatus performs printing by ejecting ink droplets corresponding to a data signal from a recording head ink ejection port onto a recording medium (recording paper). The printed recording medium is transported to the discharge side by the transport means and discharged into a predetermined paper stocker.
In general, the recording medium conveying means is such that a roller such as rubber is brought into contact with the side opposite to the printing side of the recording medium, and further, a spur is brought into contact with the printing side so as to press the recording medium toward the roller side. The recording medium is held by the conveying roller and conveyed.
With regard to this type of recording medium conveying means, Japanese Patent Laid-Open No. 2-41277 discloses a technique for simplifying the conveying mechanism.
[0003]
[Problems to be solved by the invention]
As shown in FIG. 7, the spur 20 that is brought into pressure contact with the transport roll 10 is attached to an elastic shaft 21 provided in a spur holder 23 provided for each spur. It is the structure which obtains the pressing force to the conveyance roll 10 of the spur 20 with an elastic force. However, the disclosed conveying means requires a number of spur holders equal to the number of spurs arranged and an elastic shaft as a pressing means, which makes it difficult to assemble parts and increases the number of assembling steps. It was. Accordingly, the present invention provides an economical recording apparatus, particularly an ink jet recording apparatus, provided with a recording medium conveying means that reduces the number of parts and reduces the assembly man-hours.
[0004]
[Means for Solving the Problems]
The recording apparatus of the present invention is a recording apparatus having an image forming unit that forms an image on a recording medium according to image information, and a recording medium conveying unit that conveys the recording medium, the recording medium conveying unit including a recording medium A holding roll for supporting the side opposite to the recording side of the medium; a plurality of spurs arranged opposite to the conveying roll and contacting the recording side of the recording medium; and a holding member for holding the spur. The member has a plurality of blocks divided in a direction perpendicular to the recording medium conveyance direction, and a plurality of spurs are rotatably held in each block of the holding member, and the spurs held for each block are conveyed. A pressure member that pressurizes in the direction of the roll is provided, the holding member is biased by the pressure member in the direction of the transport roll for each block, and one pressure member for each block feeds the plurality of spurs of the transport roll. Pressurize in the direction The pressing force of the pressing member is configured to be set for each block, and the pressing force of each block of the holding member is set by setting the pressing force of the pressing member in proportion to the number of spurs that the block holds, The pressure contact pressure between the spur and the transport roll is set constant. The ink jet recording apparatus of the present invention includes an image forming unit that discharges ink according to image information to form an image on a recording medium, and a recording medium transport unit that transports the recording medium.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view of the conveying means as viewed from above, and FIG. 2 is an explanatory cross-sectional view thereof.
The recording medium conveyance means of the ink jet recording apparatus includes a conveyance roll 50 and a spur 40 disposed in contact with the conveyance roll 50.
The transport roll 50 is formed of an elastic body such as rubber and is rotatably disposed on the rotation shaft 51.
The spur 40 is attached to a housing 41 that is a holding member. A plurality of housings 41 are arranged in a direction perpendicular to the conveyance direction of the recording medium by dividing the width in the conveyance direction of the recording medium. In this embodiment shown in the figure, the housing 41 has a conveyance width divided into a plurality of blocks. For example, the blocks 41A, 41B, and 41c are used.
[0006]
Each block 41A, B, C holds a plurality of spurs 40. The spur 40 has a support shaft 45 and is rotatably disposed on a spur mounting portion 43 of the blocks 41A, B, and C. Each block 41A, B, C is connected through a connecting shaft 47, and the connecting shaft 47 is supported by being fitted into a fitting groove 63 of a support member 61 disposed on the plate 60. The housing 41 to which the blocks are connected is rotatable with respect to the plate 60 in the arrow X direction.
Further, the housing 41 is biased in the direction of the transport roll by a spring 70 that is a pressure member for each block.
[0007]
The recording medium conveying means configured as described above is such that the three spurs 40 arranged in the block 41A are pressed in the direction of the conveying roll 50 by the urging force of one spring and the first spring 70A in the housing 41. Then, the recording surface of the passing recording medium is pressed to promote conveyance. Similarly, the three spurs 40 disposed in the block 41B are pressed in the direction of the transport roll 50 by the urging force of one spring and the second spring 70B, and a plurality of spurs 40 disposed in the block 41C. Is pressed in the direction of the transport roll 50 by the urging force of one spring and the third spring 70C. At this time, by making the holding hole 49 of the spur 40 a long hole, it can be dispersed so that the pressure contact force with the transport roll does not concentrate on one spur. Further, it is possible to prevent spurs not coming into contact with the transport roll.
[0008]
In this ink jet recording apparatus, a plurality of spurs 40 are pressed in the direction of the transport roll 50 for each block by a single spring 70, so that the conventional technique requires one pressing means for one spur. On the other hand, reduction of the number of parts and simplification of the assembly man-hour are achieved. Furthermore, by setting the pressing force of the spring 70 in proportion to the number of spurs 40 held by the blocks 41A, B, C, the pressing force of the holding member 41, the pressure contact force between the transport roll 50 and the spur 40 becomes constant. The recording medium can be smoothly conveyed.
Further, since the housing 41 is divided into blocks 41A, 41B, and 41C that hold the spur 40 and is miniaturized, warping due to molding and warping due to environmental temperature can be absorbed by elastic deformation of the rotation support shaft 47 portion, and the transport roll The pressing force with 50 is stabilized. Furthermore, it is possible to adjust the setting of the pressing force with the conveying roll 50, corresponding to the size of the recording medium conveyed by the arrangement interval of the springs 70 and the supporting interval of the housing 41 to the plate 60.
[0009]
(Example)
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 3 is a diagram showing a schematic configuration of an ink jet recording apparatus according to the present invention. FIG. 3 is a cross-sectional explanatory view of a printing portion of the ink jet recording apparatus, FIG. 4 is a structural explanatory view of a spur mounting portion, and FIG. Sectional drawing and FIG. 6 are top views of a housing.
The ink jet recording apparatus 100 records on the recording medium P by the recording head 120 positioned above the recording medium P with respect to the recording medium P which is supplied from the upstream side and is in a horizontal position on the support member 110. The recording medium P is discharged downstream. The recording medium P is composed of, for example, paper or a postcard.
[0010]
The recording head 120 is mounted on the carriage 125 in contact with the ink cartridge 121. The carriage 125 is configured to be slidable by a guide shaft 127 and a guide rail (not shown) extending in a direction orthogonal to the recording paper P conveyance direction.
A position facing the ink discharge port surface 120a of the recording head 120 is a recording position on the recording medium P, and a support member 110 for the recording medium P is disposed at the recording position.
[0011]
Supply side conveyance means 130 is disposed on the supply side of the recording medium P with respect to the recording position.
The supply side conveyance unit 130 includes a first conveyance roller 131 and a pinch roller 133.
The recording medium P transported from the direction of arrow A by a paper feeding means (not shown) is nipped by the transport roller 130 and the pinch roller 133 and sent to the recording position.
A discharge-side first transport unit 150 and a discharge-side second transport unit 160 are provided downstream of the recording position in the discharge direction.
[0012]
The discharge-side first conveyance means 150 includes a second conveyance roll 151 and a first spur 153 that hold the sheet that has been recorded by the recording head 120 and convey it to the downstream side.
The second transport roll 151 supports and transports the recording medium P from the back surface (the surface opposite to the recording surface), and the first spur 153 is a pressing unit that presses the recording surface of the recording medium P. P is pressed in the direction of the conveyance roll 151 to urge conveyance. The transport position of the second transport roll 151 is the same horizontal plane as the support surface of the support member 110 at the recording position.
[0013]
The discharge-side second transport unit 160 is disposed on the downstream side of the first transport unit 150 and includes a third transport roll 161 and a second spur 163. The third transport roll 161 supports the recording medium P sent from the second transport means 150 from the back surface (the surface opposite to the recording surface) and transports it downstream. The second spur 163 is a pressing unit that presses the recording surface of the recording medium P, and presses the recording medium in the direction of the conveyance roll 161 to promote conveyance.
These conveying means are configured by attaching a plurality of conveying rolls 151 and 161 to a rotating shaft arranged in a direction orthogonal to the discharge direction of the recording medium P, and the conveying rolls 151 and 161 are rotated by the rotation of each rotating shaft. Transport the recording medium.
[0014]
The spurs 153 and 163 are rotating members and are attached to a plate 200 disposed in the recording apparatus main body. A plurality of spurs 153 and 163 are arranged corresponding to the transport rolls 151 and 161.
The spur 153 is attached to the plate 200 while being held by the housing 220. The spur 163 is fixed to the plate 200 by a mounting member 230.
[0015]
Next, attachment of the spur 153 to the plate 200 will be described.
The housing 220 that holds the spur 153 is configured to be divided into a plurality of blocks orthogonal to the conveyance direction. For example, as illustrated, the first block 220A, the second block 220B, and the third block 220C have five spurs 153 held in the first block 220A, and the second block 220B. In the third block 220C, four spurs 153 are held. A support shaft 221 is disposed on each of the blocks 220A, 220B, and 220C, and is connected by the support shaft 221.
Each block 220A, B, C is rotatably attached to a support member 210 disposed on the plate 200. Each block 220 is configured to be rotatable with respect to the plate 200 by fitting the support shaft 221 of each block into the fitting groove 212 of the support member 210. Further, each block 220A, B, C is urged in the direction of arrow W by a spring 300 attached to a spring attachment portion 223 provided at the center of each block 220A, B, C.
[0016]
In the ink jet recording apparatus configured as described above, the first block 220A is the postcard size, the first block 220A and the second block 220B are the size of the B5 plate, and the first block 220A to the third block 220C are the same. Assuming that the size of the B4 plate is used, the urging force of the spring 300 provided for each block can be set according to the size of the recording medium used, and the pressure contact pressure between the spur and the transport roll can be made constant.
[0017]
Further, in this embodiment, one spring 300 arranged in each housing 220 executes a pressing of a plurality (4 to 5) spurs, thereby achieving a reduction in the number of springs arranged. ing. Furthermore, the number of assembly springs can be reduced and the number of assembly steps can be reduced and the cost can be reduced. Further, by making the attachment hole 155 of the spur 153 a long hole, the spur 153 can be moved in the pressurizing direction so that the applied pressure is not concentrated on one spur. Moreover, it is possible to prevent the occurrence of spurs that do not contact the transport roll.
Further, the housing can be divided and reduced in size, so that the molding accuracy can be improved and the response to environmental changes is facilitated.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a configuration of a recording medium conveyance device of an ink jet recording apparatus.
2 is a cross-sectional explanatory view of FIG.
FIG. 3 is a cross-sectional explanatory diagram of an ink jet recording apparatus.
FIG. 4 is a front view of a spur mounting member. FIG. 5 is a cross-sectional view of a first spur mounting portion.
FIG. 6 is a plan view of a housing.
FIG. 7 is an explanatory view showing a conventional example of spur attachment.
[Explanation of symbols]
40,153 spur, 41,220 housing, 41A, B, C, 220A, B, C block, 47,221 support shaft, 50,151 transport roll, 60,200 plate, 61,210 support member, 70,300 spring .

Claims (3)

In a recording apparatus having image forming means for forming an image on a recording medium in accordance with image information and recording medium transporting means for transporting the recording medium,
The recording medium conveying means comprises a conveying roll above the recording side of the recording medium for supporting the opposite side, one in contact with the recording side of the which is disposed opposite the transport rollers held by the holding member storage medium The above spur and a pressure member of a holding member that pressurizes the spur in the direction of the transport roll,
The holding member has a plurality of blocks connected by the rotation supporting shaft is Rutotomoni coaxial divided in a direction perpendicular to the recording medium conveying direction,
Each block of the holding member, the is rotatably attached to the device through a rotation shaft, and, together with the rotatably holding a plurality of spurs, pressurizing the spur to keep the direction of the transport roll pressure One pressure member each ,
The holding member, the one pressing respectively biased by pressurized pre SL plurality of spurs on the conveyor roll direction to the conveying roll direction by material for each block,
The pressure force of the pressure member is capable of setting for each block, constant and formed by the recording apparatus the pressing force of the pressure spurs and transporting roll of each block of the holding member. The pressing force of each block of the holding member is such that the pressure contact force between the spur and the transport roll is made constant by setting the pressing force of the pressing member in proportion to the number of spurs held by the block. Item 2. The recording device according to Item 1. The recording apparatus according to claim 1, further comprising: an image forming unit that discharges ink according to image information to form an image on a recording medium; and a recording medium conveyance unit that conveys the recording medium. Inkjet recording device.

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