KR100441503B1 - Drive apparatus for ink jet printer - Google Patents

Abstract

The present invention relates to a driving apparatus of an ink jet printer in which a feed loss is not generated by supplying power to a feed roller when supplying printing paper to a feed roller while using a single motor. An object of the present invention, the first gear train and the end gear of the first gear train is installed on one side or both sides of the feed roller shaft, the feed roller shaft is oscillated in a certain angle range around the feed roller shaft according to the rotation direction of the feed roller shaft and The second gear train is installed on the frame of the inkjet printer so as to be connected and transmits the rotational force of the feed roller shaft, the front gear is connected to the end gear of the second gear train, and the end gear is coaxially coupled to the feed roller shaft to which the feed roller is assembled. A third gear train oscillating at a predetermined angle with respect to the front end gear shaft on which the front end gear is assembled according to the rotational direction of the feed roller; the first gear when the feed roller rotates in the direction to transfer the print paper to the print head. The feed roller, which is separated from the second gear train and coaxially coupled to the end gear of the third gear train, pivots downward with respect to the tip gear axis of the third gear train. Is achieved by providing an apparatus for driving an ink jet printer, characterized in that the separation value and roller.

Description

Drive apparatus for ink jet printers

The present invention relates to a driving apparatus of an ink jet printer, and more particularly, to a driving apparatus of an ink jet printer in which power is not transmitted to a pickup roller and a transfer roller while a feed roller is used to feed print media at intervals. will be.

In general, inkjet printers that have the same orientation for loading new print media and ejected printed media, referred to as inkjet printers of the Front Insert Front Out (FIFO) type, transfer the picked print media to the feed roller. The feed roller is installed between the pickup roller and the feed roller.

One example of such an inkjet printer is shown in FIG. Referring to FIG. 1, an ink jet printer includes a paper feed cassette 10, a pickup roller 20, a transfer roller 30, a feed roller 40, and a print head 50. At this time, the feed roller 30 is installed to rotate while facing the pinch roller 31, the pinch roller 31 is elastically supported by the pinch spring 32 to press the feed roller 30 with a constant force have.

The plurality of printing papers 11 loaded on the paper feed cassette 10 are separated into sheets by the pickup roller 20 and the separating wall 12, and the feed roller 30 and the pinch roller 31 ride on the separating wall 12. Enter between). The printing paper 11 ′ entered between the feed roller 30 and the pinch roller 31 is transferred to the feed roller 40 by the rotation of the feed roller 30. The printing paper 11 ′ entered into the feed roller 40 is transferred to the lower side of the print head 50 by the rotation of the friction roller 41 and the feed roller 40 installed above the feed roller 40. At this time, the paper guide 52 is provided below the print head 50 so that the printing paper 11 'enters between the print head 50 and the paper guide 52. When the print paper 11 'is positioned on the paper guide 52, the print head 50 moves ink left and right along the guide rod 51 by the moving belt 53 to print a predetermined image. It prints on the paper 11 '. The printing paper 11 ′, which has been printed, is discharged to the outside by the discharge roller 60.

At this time, the feed roller 40 supplies the printing paper 11 'onto the paper guide 52 at a predetermined interval corresponding to the width that the print head 50 can print in one reciprocating motion, and the printhead ( 50), the printer waits until the printing of the corresponding interval is completed and supplies the printing paper 11 'at regular intervals (hereinafter referred to as interval feeding). Accordingly, the feed roller 40 is operated by a separate motor and precisely controlled by feeding back the rotation angle of the feed roller to a rotation amount detection sensor such as an encoder.

By the way, in order to reduce manufacturing costs these days, by removing the motor for driving the feed roller 30, by adding a power transmission device (not shown) for transmitting the power of the feed roller 40 to the feed roller 30, An inkjet printer for driving the feed roller 40 and the feed roller 30 by one motor has been developed and used.

However, the driving apparatus of the inkjet printer for driving the feed roller 30 and the feed roller 40 with one motor as described above theoretically has the same traveling speed of the feed roller 40 and the traveling speed of the feed roller 30. Even so, the case where the speed of the printing paper passing on the feed roller 40 and the speed of the printing paper passing on the feed roller 30 is substantially different. That is, when a sheet of printing paper passes through the feed roller 40 and the feed roller 30 at the same time, it means that the printing paper is subjected to a tensile force or a compressive force according to the speed of the feed roller 40 and the feed roller 30. do. This is because the friction coefficients of the surfaces of the feed roller 40 and the feed roller 30 cannot be exactly the same, and the backlash or the like existing in the power transmission device that transfers power from the motor to the feed roller 30 and the feed roller 40. This is because the mechanical errors are different from each other.

In this way, when the printing paper conveyed by the feed roller is affected by the feeding roller, the feed loss occurs during the feeding of the printing paper by the feed roller. Therefore, the feeding of the printing paper by the feed roller can be precisely controlled. none. If the gap feed by the feed roller is not accurate, the quality of the printed image is deteriorated. Therefore, in order to improve the printing quality of the inkjet printer driving the feed roller and the feed roller with one motor, it is necessary to prevent the feed roller from rotating while the power is not transmitted to the feed roller during the feed of the feed roller.

The present invention has been made to solve the above problems, the inkjet printer for driving the feed roller and the feed roller with a single motor, the ink jet power is not transmitted to the feed roller while the feed roller to transport the printing paper Its purpose is to provide a drive for a printer.

1 is a side cross-sectional view schematically showing the structure of an inkjet printer having a driving device according to the prior art;

2 is a perspective view showing a driving apparatus of the inkjet printer according to the present invention;

3 is a partial perspective view illustrating a position of a friction member interposed between a first gear train and a third gear train in the driving apparatus of the inkjet printer of FIG. 2;

FIG. 4 is a cross-sectional view showing the states of the gear trains when the feed roller feeds the printing paper in the driving apparatus of the inkjet printer of FIG. 2;

5 is a cross-sectional view showing the states of the gear trains when the printing paper is picked up and transferred to the feed roller in the driving apparatus of the ink jet printer of FIG.

6 is a perspective view showing another embodiment of the driving apparatus of the inkjet printer according to the present invention.

* Description of the symbols for the main parts of the drawings *

10; Paper feed cassette 11,11 '; Printing paper

12; Dividing wall 100; motor

110; Feed roller 111; Feed roller shaft

112; Feed gear 120; First gear train

121; First swing arm 122; First gear

123; Second gear 130; 2nd gear row

131; Third gear 133; 4th gear

140; Third gear train 141; 2nd swing arm

142; Fifth gear 144; 6th Gear

150; Feed roller 151; Feed roller shaft

155; Pinch roller 160; Pick-up Roller Unit

161; Pickup gear 162; Upper housing

163; Lower housing 165; Pick up roller

168; Gear housing 170; 7th Gear

The purpose of the present invention as described above, an inkjet printer that picks up the printing paper loaded in the paper feed cassette with the pickup roller, transfers the feed roller and the pinch roller to the feed roller, and then performs printing with the print head while transferring the feed roller with the gap. In the driving device of the feed roller is installed on one side or both sides of the feed roller shaft assembled, the first gear train and the end gear of the first gear train swinging at a predetermined angle range around the feed roller shaft according to the rotation direction of the feed roller shaft and The second gear train is installed on the frame of the inkjet printer so as to be connected and transmits the rotational force of the feed roller shaft, the front gear is connected to the end gear of the second gear train, and the end gear is coaxially coupled to the feed roller shaft to which the feed roller is assembled. According to the rotation direction of the feed roller, it includes a third gear train oscillating at a predetermined angle with respect to the tip gear shaft in which the tip gear is assembled. When the feed roller rotates in the direction of feeding the print paper to the print head, the feed roller separated from the second gear train and coaxially coupled to the end gear of the third gear train centers around the tip gear axis of the third gear train. It is achieved by providing a drive device for an ink jet printer, characterized in that it is pivoted downward to be separated from the pinch roller.

Here, the first gear train is assembled so that one end can rotate freely with respect to the feed roller shaft, and the other end includes a first swing arm having a second gear shaft protruding therefrom, a first gear assembled to rotate integrally with the feed roller shaft, And a second gear meshed with the first gear and assembled to rotate freely about the second gear shaft. In this case, a friction member is interposed between the side of the second gear and the first swing arm, and the friction member is preferably one of a compression spring and a curvature spring.

In addition, the second gear train includes a third gear assembled to rotate freely about the third gear shaft protruding from the frame and engaged with the end gear of the first gear train, and a fourth gear installed to rotate with the third gear. Characterized in that.

And, the third gear train is assembled so that one end can rotate freely with respect to the feed roller shaft to which the feed roller is assembled, and the other end is assembled to rotate integrally with the second swing arm with the fifth gear shaft protruding from the feed roller shaft. And a fifth gear that is freely rotated about the fifth gear shaft and engaged with the sixth gear and that receives the rotational force of the end gear of the second gear train. At this time, the friction member is interposed between the side of the sixth gear and the second swing arm, the friction member is preferably any one of the compression spring or curvature spring.

In addition, the driving apparatus of the ink jet printer according to the present invention is characterized in that it further comprises a seventh gear that meshes with the end gear of the third gear train when the feed roller is in contact with the pinch roller to transfer the printing paper to the feed roller. . At this time, the friction member is provided on the side of the seventh gear, the friction member is preferably any one of the compression spring or curvature spring.

An object of the present invention as described above, the inkjet printer to print the paper loaded in the paper feed cassette to the pickup roller to transfer the feed roller and the pinch roller to the feed roller, and then print the print head with the feed roller interval transfer In the drive device of the feed roller, the feed roller is installed on one side of the assembled feed roller shaft and is connected to the first gear train and the end gear of the first gear train oscillating in a predetermined angle range about the feed roller shaft according to the rotation direction of the feed roller shaft. A second gear train that is installed in the frame of the inkjet printer to transfer the rotational force of the feed roller shaft, a plurality of support arms for supporting both ends of the feed roller shaft to which the feed roller is assembled, and an extension for connecting the plurality of support arms. A front end gear which is assembled to rotate freely at one end of the shaft and the extended shaft and meshes with the end gear of the second gear train; And a third gear train including an end gear assembled to rotate integrally with the roller shaft. When the feed roller rotates in a direction to transfer the print paper to the print head, the first gear train is separated from the second gear train. The feed roller coaxially coupled to the end gear of the third gear train is achieved by providing a drive device for an ink jet printer, characterized in that the feed roller is separated from the pinch roller by pivoting downward about the extension axis of the third gear train.

Here, the first gear train is assembled so that one end can rotate freely with respect to the feed roller shaft, and the other end includes a first swing arm having a second gear shaft protruding therefrom, a first gear assembled to rotate integrally with the feed roller shaft, And a second gear meshed with the first gear and assembled to rotate freely about the second gear shaft, wherein the friction member is interposed between the side of the second gear and the first swing arm.

In addition, the second gear train includes a third gear assembled to rotate freely about the third gear shaft protruding from the frame and engaged with the end gear of the first gear train, and a fourth gear installed to rotate with the third gear. Characterized in that.

The third gear train includes a fifth gear that meshes with the end gear of the second gear train and is assembled to rotate freely on the connecting shaft, and a sixth gear that engages with the fifth gear and rotates integrally with the feed roller shaft. The friction member is interposed between the side of the sixth gear and the support arm.

In addition, the object of the present invention as described above, the printing paper loaded in the paper feed cassette is picked up by the pickup roller and transported to the feed roller by the feed roller and the pinch roller, and then the printing is carried out with the print head while feeding the feed roller interval An inkjet printer driving apparatus, comprising: a motor, a reduction gear for reducing the speed of the motor, a feed gear installed on one side of a feed roller shaft in which a feed roller is assembled, and a feed gear meshed with the reduction gear, and installed on both sides of the feed roller shaft. A plurality of first gear trains oscillating in a certain angular range around the feed roller shaft according to the rotational direction of the roller shaft, a plurality of second gear trains that engage the end gears of the plurality of first gear trains and transmit the rotational force of the feed roller shaft, The gear is connected to the end gear of the second gear train, and the end gear is coaxially coupled to the feed roller shaft on which the feed roller is assembled. A plurality of third gear trains oscillating in a predetermined angular range around the assembled end gear shafts, a pickup shaft assembled to rotate integrally with the front gears of the plurality of second gear trains, and one end is assembled to the pickup shaft, and the other end is fed. And a pickup roller unit for pressing the upper portion of the printing paper loaded in the cassette, and the pickup roller unit rotates because the first gear train is separated from the second gear train when the feed roller is rotated in the direction of feeding the printing paper to the print head. And a feed roller coaxially coupled to the front end gear of the third gear train is achieved by providing a driving device of the ink jet printer, characterized in that it is pivoted downward with respect to the front end gear axis of the third gear train and separated from the pinch roller.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 shows an embodiment of a driving apparatus of an ink jet printer according to the present invention.

Referring to FIG. 2, the driving apparatus of the inkjet printer according to the present invention includes a motor 100, a feed roller 110, a first gear train 120, a second gear train 130, and a third gear train 140. , A feed roller 150, and a pickup roller unit 160.

The motor 100 is a power source for operating the drive of the inkjet printer, and a DC motor is generally used. In addition, since the motor 100 is installed on one side of the feed roller 110, and is mainly responsible for the line feed of the feed roller 110, it is also referred to as an LF motor.

In order to transfer the power of the motor 100 to the feed roller 110 which will be described later, a reduction gear 102 is provided between the motor 100 and the feed roller 110. The reduction gear 102 is formed by integrally forming the pulley and the gear, and the rotation speed of the motor 100 is reduced because the pulley has a larger diameter than the pulley (not shown) assembled to the motor shaft. In addition, the gear (not shown) of the reduction gear is engaged with the feed gear 112 so that the rotational force of the motor 100 is transmitted to the feed gear 112. At this time, because the diameter of the feed gear 112 is larger than the gear diameter of the reduction gear 102, the rotational speed of the motor 100 is further reduced and transmitted to the feed gear 112.

The feed roller 110 receives power from the motor 100 and spaces the print paper down the print head 50 (see FIG. 1) to allow printing to be performed. The feed roller 110 is installed on the feed roller shaft 111, the feed gear 112 described above is assembled on one side of the feed roller shaft 111. In addition, an encoder 113 for detecting the rotation angle of the feed roller 110 is provided outside the feed gear 112. Both ends of the feed gear 112 are supported by a frame (not shown) of the inkjet printer. The inkjet frame is equipped with a paper feed cassette 10 (see FIG. 1), and supports the ink jet frame so that it can be stably operated while maintaining a gap between operating elements such as the feed gear shaft 111 and the print head.

The first gear train 120 includes a first swing arm 121, a first gear 122, and a second gear 123. One end of the first swing arm 121 is assembled to rotate freely with respect to the feed roller shaft 111, and the second gear shaft 124 protrudes from the other end thereof. The first gear 122 is coupled to rotate integrally with the feed roller shaft 111 to rotate at the same speed as the feed roller shaft 111. The second gear 123 meshes with the first gear 122 and is assembled to rotate freely with respect to the second gear shaft 124 of the first swing arm 121. Therefore, when the first gear 122 rotates, the second gear 123 rotates, and the first swing arm 121 rotates around the feed gear shaft 111 by the reaction force of the second gear 123. A certain angle moves in the rotational direction of the gear 122 (hereinafter referred to as swing operation). When the first gear 122 rotates in the opposite direction, the first swing arm 121 also moves by an angle in the opposite direction. That is, the first swing arm 121 swings in a predetermined angle range according to the rotation of the first gear 122. At this time, the friction between the side of the second gear 123 and the first swing arm 121 so that the swing operation of the first swing arm 121 by the rotation of the first gear 122 occurs more reliably. It is preferable to provide the member 125 (refer FIG. 3). As the friction member, it is preferable to use a compression spring or a curvature spring to pressurize the second gear 123 with a constant force. Here, the case where the first gear train 120 is composed of two gears has been described, but the first gear train 120 may be configured by three or more gears. In this case, the first gear 122 described above corresponds to the front end gear of the first gear train, and the second gear 123 corresponds to the end gear of the first gear train. The same is as described above except that an idle gear is provided between the front end gear and the end gear of the first gear train.

The first gear train 120 may be installed only at one end of the feed roller shaft 111, but is preferably installed at both ends of the feed roller shaft 111 as shown in FIG. At this time, the first gear train 120 on the side where the feed gear 112 is installed is installed on the feed roller shaft 111 between the feed roller 110 and the feed gear 112.

The second gear train 130 includes a third gear 131 and a fourth gear 133. The third gear 131 is assembled to one end of the pickup shaft 135 and rotates integrally with the pickup shaft 135. The fourth gear 133 is installed between the third gear 131 and the fifth gear 142 of the third gear train 140 to be described later, so that the power of the third gear 131 is fifth gear 142. To pass. Here, although the case where the second gear train 130 is composed of two gears has been described, it may be configured by three or more gears. In this case, the third gear 131 described above corresponds to the front end gear of the second gear train, and the fourth gear 133 corresponds to the end gear of the second gear train. An idle gear is installed between the front end gear and the end gear of the second gear train.

The second gear train 130 may be installed according to the number of the first gear train 120 installed. However, two second gear trains 130 may be provided corresponding to the first gear train 120 as in the present embodiment. When two second gear trains 130 are installed, two third gears 131 are provided, one at each end of the pickup shaft 135, and the rotation of the pickup shaft 135 is supported by the frame of the inkjet printer. .

The third gear train 140 includes a second swing arm 141, a fifth gear 142, and a sixth gear 144. One end of the second swing arm 141 is assembled to rotate freely with respect to the feed roller shaft 151, and the other end of the second swing arm 141 is protruded. In addition, the fifth gear shaft 143 is supported to be rotatable in a frame not shown in FIG. The fifth gear 142 is assembled to rotate freely with respect to the fifth gear shaft 143 and meshes with the fourth gear 133 of the second gear train 130. The sixth gear 144 is assembled to rotate integrally with the shaft at one end of the feed roller shaft 151 and is engaged with the fifth gear 142. Therefore, when the fifth gear 142 rotates, the sixth gear 144 rotates, and the second swing arm 141 is centered on the fifth gear shaft 143 by the reaction force of the sixth gear 144. The swing motion is moved at an angle in the rotational direction of the fifth gear 142. When the fifth gear 142 rotates in the opposite direction, the second swing arm 141 also swings in the opposite direction. That is, the second swing arm 141 swings in a predetermined angle range according to the rotation of the fifth gear 142. At this time, the friction between the side of the sixth gear 144 and the second swing arm 141 in order to more reliably swing the swing of the second swing arm 141 by the rotation of the fifth gear 142. It is preferable to provide the member 145 (see FIG. 3). As the friction member, it is preferable to use a compression spring or a curvature spring to pressurize the sixth gear 144 with a constant force. Although the third gear train 140 has been described with two gears, the third gear train 140 may be configured with three or more gears. In this case, the fifth gear 142 described above corresponds to the front end gear of the third gear train, and the sixth gear 144 corresponds to the end gear of the third gear train. In addition, it is the same as the above except that an idle gear is installed between the front end gear and the end gear of a 3rd gear train.

The third gear train 140 may be installed according to the number of the first gear train 120 and the second gear train 130, but as in this embodiment, the first gear train 120 and the second gear train It is preferable to provide two in correspondence with 130. When two second gear trains 130 are installed, two sixth gears 144 are provided, one at each end of the feed roller shaft 151.

The feed roller 150 is installed to be in contact with the pinch roller 155 and transfers the printing paper picked up from the pickup roller 165 and entered between the feed roller 150 and the pinch roller 155 toward the feed roller 110. . The feed roller 150 is integrally assembled to the feed roller shaft 151, and the sixth gear 144 is integrally assembled at both ends of the feed roller shaft 151. In addition, one end of the second swing arm 141 is assembled to the feed roller shaft 151 between the sixth gear 144 and the feed roller 150, and is installed so as not to rotate even when the feed roller shaft 151 rotates. do. Therefore, when the fifth gear 142 is rotated, the sixth gear 144 is rotated so that the feed roller shaft 151 and the feed roller 150 are integrally supported at one end of the second swing arm 141. Rotate At this time, when the fifth gear 142 rotates, since the second swing arm 141 swings up and down about the fifth gear shaft 143, the feed roller 150 moves up and down. When the feed roller 150 ascends about the fifth gear shaft 143, the feed roller 150 rotates in a state where the feed roller 150 collides with the pinch roller 155.

In addition, the feed roller 150 is in contact with the sixth gear 144 of the third gear train 140 in the state in which the feed roller 150 is in contact with the pinch roller 155 by the upward rotation of the second swing arm 141. Gear 170 is provided. Since the seventh gear 170 is installed to be engaged with the sixth gear 144 and the fifth gear 142 on which the feed roller 150 is assembled, the feed roller 150 is pinched by the own weight. ) To prevent falling. Therefore, it is preferable that the seventh gear 170 supports the side surface of the seventh gear 170 with the friction member 171 (see FIG. 3) so as to withstand the force falling by the weight of the feed roller 150. As the friction member, the compression spring, the curvature spring, or the like is used as the first swing arm 121 and the second swing arm 141 described above. The seventh gear 170 may also be installed to correspond to the number of installation of the third gear train 140 installed in the feed roller 150.

The pickup roller unit 160 receives the power of the motor 100 and separates the printing paper 11 loaded on the paper feed cassette 10 into sheets to transfer them to the feed roller 150. The pickup roller unit 160 is assembled so as to rotate freely in one end of the upper housing 162 and the upper housing 162 in which the pickup gear 161 and the plurality of gears installed are integrally assembled with the pickup shaft 135. And a pickup roller 165 assembled to the lower end of the lower housing 163. In the pickup roller unit 160, when the pickup shaft 135 rotates, the pickup gear 161 rotates, and the gears embedded in the upper housing 162 and the lower housing 163 rotate, so that the pickup roller 165 rotates. . In addition, since the pickup roller unit 160 is articulated with the pickup roller support arm 166, the upper housing 162, and the lower housing 163 rotated and supported by the frame, the printing paper loaded in the paper cassette 10 Even if 11 is fed by the pick-up roller 165 and the stacking height is lowered, it is always possible to maintain contact with the upper surface of the printing paper 11 by its own weight.

Hereinafter, the operation of the driving apparatus of the ink jet printer having the above configuration will be described with reference to FIGS. 2 to 5.

Fig. 4 is a side view of the driving apparatus of the ink jet printer when the feed roller feeds the printing paper. When the interval feed of the feed roller 110 is completed in this state, the motor 100 rotates in the reverse direction and the feed roller 110 rotates in the clockwise direction (arrow A in FIG. 4). At this time, the rotation speed of the motor 100 is transmitted through the belt 101 and the reduction gear 102 to rotate the feed gear 112 in a reduced state. When the feed gear 112 rotates, the feed roller shaft 111 coaxially coupled with the feed gear 112 also rotates clockwise integrally with the feed gear 112. When the feed roller shaft 111 rotates clockwise, the first gear 122 also rotates clockwise to rotate the second gear 123 counterclockwise. Then, the first swing arm 121 is rotated in the clockwise direction (arrow D direction in FIG. 4) by the rotation reaction force of the second gear 123 to engage with the third gear 131.

When the second gear 123 meshes with the third gear 131, the power of the motor 100 is transmitted to the third gear 131 so that the third gear 131 rotates, and the third gear 131 rotates. The pickup shaft 135 integrally assembled with the third gear 131 rotates. When the pickup shaft 135 rotates, the pickup gear 161 is rotated and the rotational power is transmitted to the pickup roller 165 through the gears constituting the upper housing 162 and the lower housing 163 to pick up roller 165. ) Rotates counterclockwise. When the pick-up roller 165 rotates counterclockwise, the printing paper 11 pressed by the pick-up roller 165 is conveyed in the direction of arrow C by the frictional force with the pick-up roller 165, and is cut into pieces by the separating wall 12. Separated and conveyed in the direction of the feed roller 150.

In addition, when the second gear 123 meshes with the third gear 131, the power of the second gear 123 rotates the fourth gear 133 through the third gear 131. When the fourth gear 133 rotates, the fifth gear 142 which is always engaged with the fourth gear 133 starts to rotate. At this time, when the second gear 123 rotates in the counterclockwise direction, the fifth gear 142 rotates in the clockwise direction.

When the fifth gear 142 rotates clockwise, the sixth gear 144 meshing with the fifth gear 142 rotates counterclockwise. Then, since the second swing arm 141 rotates clockwise around the fifth gear shaft 143 by the rotation reaction force of the sixth gear 144, the feed roller 150 pivots upward. The feed roller 150 pivoted upward by the second swing arm 141 is stopped in contact with the pinch roller 155 (see FIG. 5). In this state, since the sixth gear 144 continues to rotate by the fifth gear 142, the feed roller 150 rotates in contact with the pinch roller 155, and the feed roller 165 feeds the feed roller. The printing paper 11 ′ entered between the 150 and the pinch roller 155 is transferred to the feed roller 110. At this time, since the sixth gear 144 of the second swing arm 141 is supported by the seventh gear 170, the feed roller 150 does not fall in contact with the pinch roller 155 and stably prints the paper ( 11 ') can be transported.

When the printing paper 11 'transported by the feed roller 150 enters between the feed roller 110 and the friction roller 41 (see FIG. 1), the motor 100 again rotates in the reverse direction. When the motor 100 rotates in the reverse direction, the feed roller 110 is rotated counterclockwise (arrow B in FIG. 4) by the reduction gear 102 to move the printing paper 11 ′ into the print head 50. 1). When the feed roller 110 rotates counterclockwise, the first gear 122 installed at one end of the feed roller shaft 111 also rotates counterclockwise to rotate the second gear 123 clockwise. Then, the first swing arm 121 is rotated counterclockwise around the feed roller shaft 111 by the reaction force of the second gear 123, so that the second gear 123 from the third gear 131. Are separated (see FIG. 4). When the second gear 123 is separated from the third gear 131, since the power of the motor 100 is not transmitted to the third gear 131, the pickup roller 165 connected to the third gear 131 rotates. You will not. In addition, if the third gear 131 does not rotate, the fifth gear 142 which rotates the second swing arm 141 in the clockwise direction also stops, so that the second swing arm 141 is moved to the weight of the feed roller 150. It rotates counterclockwise. When the second swing arm 141 rotates counterclockwise, the feed roller 150 is separated from the pinch roller 155.

As described above, when the motor 100 rotates in one direction and the feed roller 110 feeds the printing paper 11 ', the feed roller 150 and the pickup roller 165 do not rotate, and the motor 100 does not rotate. ) Rotates in the reverse direction, the pickup roller 165 and the feed roller 150 is rotated to pick up the printing paper (11) loaded in the paper feed cassette (10) to feed to the feed roller (110). Therefore, the feed loss due to the difference in the rotational speed of the feed roller 150 and the feed roller 110 is not generated.

In the above, the pickup roller unit is formed in an articulated shape, and the driving device of the ink jet printer having a structure in which the shaft connecting two second swing arms provided at both ends of the transfer roller interfere with the pickup roller unit.

Another embodiment of the present invention is a driving apparatus of an ink jet printer when the shaft connecting the two second swing arms described above does not interfere with the pickup roller unit. An example of this is shown in FIG. 6.

Referring to FIG. 6, an ink jet printer driving apparatus according to another embodiment of the present invention may include a feed roller 110, a first gear train 120, a second gear train 130, and a third gear train 140 ′. , A feed roller 150, and a pickup roller unit 160 ′.

The third gear train 140 ′ includes two support arms 146, an extension shaft 147, a fifth gear 142, and a sixth gear 144. One end of the support arm 146 is assembled to rotate freely with respect to the feed roller shaft 151, and the other end of the support arm 146 is assembled with an extension shaft 147 for integrally connecting the two support arms 146. That is, the feed roller shaft 151 is assembled so as to be free to rotate at the tip of the structure made of 'c' shape by the two support arms 146 and the extension shaft 147. In addition, the gear shaft 148 protrudes outward from the two support arms 146 and is rotatably supported by an inkjet printer frame (not shown). Each of the fifth gear 142 and the sixth gear 144 is assembled to the support arm 146 on one side to which power is transmitted from the motor 100. The fifth gear 142 is assembled to rotate freely with respect to the gear shaft 148 protruding to the outside of the support arm 146, and the sixth gear 144 rotates integrally with the feed roller shaft 151 and is fifth. It is assembled to engage with the gear 142. Therefore, when the fifth gear 142 rotates, the sixth gear 144 rotates. Then, the support arm 146 swings about the extension shaft 147 in the rotational direction of the fifth gear 142 by the reaction force of the sixth gear 144.

Since the structures of the first gear train 120 and the second gear train 130 are the same as those of the above-described embodiment, a detailed description thereof will be omitted.

The pickup roller unit 160 ′ has a structure in which the pickup roller 165 does not interfere with the extension shaft 147 even when the printing paper 11 is maximally loaded in the paper cassette 10 (see FIG. 3). In the present embodiment, the pickup gear 161 and the pickup roller 165 coupled to the pickup shaft 135 are connected by a straight gear housing 168. Accordingly, when the pickup shaft 135 rotates, the pickup gear 161 rotates, and the rotation of the pickup gear 161 rotates the pickup roller 165 by the gears built into the gear housing 168. In addition, when the stacking height of the printing paper 11 is lowered by the pickup roller 165, the pickup roller 165 falls into its own weight, thereby maintaining contact with the printing paper 11 at all times.

As described above, in another embodiment of the driving apparatus of the ink jet printer according to the present invention, only the number of the first gear train 120, the second gear train 130, and the third gear train 140 'is different from each other. Since the method of transmitting power to the feed roller 150 and the pick-up roller 165 by the swing operation of the first swing arm 121 of 120 is the same, a detailed description thereof will be omitted.

As described above, according to the driving apparatus of the ink jet printer according to the present invention, since the feed roller does not feed the print paper during the gap feeding by the feed roller, the feed loss caused by the subtle difference between the feed speed of the feed roller and the feed roller. This will not happen. Therefore, the phenomenon that the quality of the print image is lowered due to the transfer loss does not occur.

As described above, according to the ink jet printer driving apparatus according to the present invention, in an ink jet printer which drives a feed roller and a feed roller by one motor, power is not transmitted to the feed roller while the feed roller feeds the printing paper. As a result, no feed loss occurs. Therefore, it is possible to prevent the deterioration of the print image due to the difference in the feed speed between the feed roller and the feed roller.

The present invention is not limited to the above-described specific embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the invention as claimed in the claims. Such changes are intended to fall within the scope of the claims.

Claims (25)

An ink jet printer driving apparatus which picks up printing paper loaded in a paper feed cassette with a pickup roller, transfers the feed roller and a pinch roller to a feed roller, and then performs printing with a print head while feeding a feed roller. A first gear train which is installed on one side or both sides of the feed roller shaft to which the feed roller is assembled, and swings at a predetermined angle with respect to the feed roller shaft according to the rotation direction of the feed roller shaft; A second gear train installed on a frame of the inkjet printer to be connected to the end gear of the first gear train, and transmitting a rotational force of the feed roller shaft; The tip gear is connected to the end gear of the second gear train, and the end gear is coaxially coupled to the feed roller shaft on which the feed roller is assembled, and the angle is centered around the tip gear shaft on which the tip gear is assembled according to the rotation direction of the feed roller. A third gear train oscillating in the range; When the feed roller rotates in the direction of conveying the printing paper to the print head, the feed roller is separated from the second gear train and is coaxially coupled to the end gear of the third gear train. An inkjet printer driving apparatus, characterized in that the pinch roller is separated from the pinch roller by pivoting downward with respect to the front gear shaft of the gear train. The method of claim 1, wherein the first gear train, One end is assembled to rotate freely with respect to the feed roller shaft, and the other end includes: a first swing arm having a second gear shaft protruding from the feed roller shaft; A first gear assembled to rotate integrally with the feed roller shaft; And And a second gear meshed with the first gear and assembled to rotate freely about the second gear shaft. The inkjet printer driving apparatus of claim 2, wherein a friction member is interposed between the side surface of the second gear and the first swing arm. 4. The driving apparatus of claim 3, wherein the friction member is one of a compression spring and a curvature spring. The method of claim 1, wherein the second gear train, A third gear assembled to rotate freely with respect to the third gear shaft protruding from the frame and meshing with the end gear of the first gear train; And And a fourth gear installed to engage and rotate with the third gear. The method of claim 1, wherein the third gear train, One end is assembled so as to be free to rotate with respect to the conveying roller shaft assembled, the other end is the second swing arm with the fifth gear shaft protruding; A sixth gear assembled to rotate integrally with the feed roller shaft; And a fifth gear freely rotating with respect to the fifth gear shaft and engaged with the sixth gear, and receiving a rotational force of the end gears of the second gear train. The driving apparatus of claim 6, wherein a friction member is interposed between the side surface of the sixth gear and the second swing arm. 8. The driving apparatus of an inkjet printer according to claim 7, wherein the friction member is one of a compression spring and a curvature spring. The inkjet of claim 1, further comprising an seventh gear engaged with the end gear of the third gear train when the feed roller contacts the pinch roller to transfer the printing paper to the feed roller. Drive of the printer. 10. The driving apparatus of claim 9, wherein a friction member is provided on a side surface of the seventh gear. The driving apparatus of claim 10, wherein the friction member is one of a compression spring and a curvature spring. An ink jet printer driving apparatus which picks up printing paper loaded in a paper feed cassette with a pickup roller, transfers the feed roller and a pinch roller to a feed roller, and then performs printing with a print head while feeding a feed roller. A first gear train which is installed at one side of the feed roller shaft on which the feed roller is assembled, and swings at a predetermined angle with respect to the feed roller shaft according to the rotation direction of the feed roller shaft; A second gear train installed on a frame of the inkjet printer to be connected to the end gear of the first gear train, and transmitting a rotational force of the feed roller shaft; A plurality of support arms for supporting both sides of the feed roller shaft to which the feed rollers are assembled to freely rotate; an extension shaft connecting the plurality of support arms; and assembled to rotate freely at one end of the extension shaft. And a third gear train including an end gear meshed with the end gear of the gear train and an end gear assembled to rotate integrally with the feed roller shaft. When the feed roller rotates in the direction of conveying the printing paper to the print head, the feed roller is separated from the second gear train and is coaxially coupled to the end gear of the third gear train. And a pinch roller separated from the pinch roller by pivoting downwardly around the extension axis of the gear train. The method of claim 12, wherein the first gear train, One end is assembled to rotate freely with respect to the feed roller shaft, and the other end includes: a first swing arm having a second gear shaft protruding from the feed roller shaft; A first gear assembled to rotate integrally with the feed roller shaft; And And a second gear meshed with the first gear and assembled to rotate freely about the second gear shaft. The driving apparatus of claim 13, wherein a friction member is interposed between the side surface of the second gear and the first swing arm. The method of claim 12, wherein the second gear train, A third gear assembled to rotate freely with respect to the third gear shaft protruding from the frame and meshing with the end gear of the first gear train; And And a fourth gear installed to engage and rotate with the third gear. The method of claim 12, wherein the third gear train, A fifth gear meshed with the end gear of the second gear train and assembled to rotate freely with respect to the gear shaft protruding outwardly of the support arm from the extension shaft; And And a sixth gear meshed with the fifth gear, the sixth gear being assembled to rotate integrally with the transfer roller shaft. 17. The driving apparatus of claim 16, wherein a friction member is interposed between the side surface of the sixth gear and the support arm. An ink jet printer driving apparatus which picks up printing paper loaded in a paper feed cassette with a pickup roller, transfers the feed roller and a pinch roller to a feed roller, and then performs printing with a print head while feeding a feed roller. motor; A reduction gear for reducing the speed of the motor; A feed gear installed at one side of the feed roller shaft on which the feed roller is assembled and engaged with the reduction gear; A plurality of first gear trains installed at both sides of the feed roller shaft and oscillating at a predetermined angle with respect to the feed roller shaft in a rotational direction of the feed roller shaft; A plurality of second gear trains meshing with the end gears of the plurality of first gear trains and transmitting rotational force of the feed roller shaft; The tip gear is connected to the end gear of the second gear train, and the end gear is coaxially coupled to the feed roller shaft on which the feed roller is assembled, and the angle is centered around the tip gear shaft on which the tip gear is assembled according to the rotation direction of the feed roller. A plurality of third gear trains swinging in a range; A pickup shaft assembled to rotate integrally with the front end gears of the plurality of second gear trains; One end is assembled to the pickup shaft, the other end; pickup roller unit for pressing the upper portion of the printing paper loaded on the paper feed cassette; includes; When the feed roller rotates in the direction of conveying the printing paper to the print head, the first gear train is separated from the second gear train so that the pickup roller unit does not rotate and is coaxial with the leading gear of the third gear train. The transfer roller is coupled to the driving device of the inkjet printer, characterized in that the pivoting downward with respect to the leading gear shaft of the third gear train and separated from the pinch roller. The method of claim 18, wherein the first gear train, One end is assembled to rotate freely with respect to the feed roller shaft, and the other end includes: a first swing arm having a second gear shaft protruding from the feed roller shaft; A first gear assembled to rotate integrally with the feed roller shaft; And And a second gear meshed with the first gear and assembled to rotate freely about the second gear shaft. 19. The driving apparatus of claim 18, wherein a friction member is interposed between the side surface of the second gear and the first swing arm. The method of claim 19, wherein the second gear train, A third gear assembled to rotate freely with respect to the pickup shaft and engaged with the end gear of the first gear train; And And a fourth gear installed to engage and rotate with the third gear. The method of claim 19, wherein the third gear train, One end is assembled so as to be free to rotate with respect to the conveying roller shaft assembled, the other end is the second swing arm with the fifth gear shaft protruding; A sixth gear assembled to rotate integrally with the feed roller shaft; And a fifth gear freely rotating about the fifth gear shaft and engaged with the sixth gear, and receiving a rotational force of the end gears of the second gear train. 23. The driving apparatus of claim 22, wherein a friction member is interposed between the side surface of the sixth gear and the second swing arm. 20. The ink jetting apparatus as claimed in claim 19, further comprising an seventh gear engaged with the end gear of the third gear train when the feed roller is in contact with the pinch roller to transfer the printing paper to the feed roller. Drive of the printer. 25. The driving apparatus of claim 24, wherein a friction member is provided on a side surface of the seventh gear.