JP3798313B2 - Winding device for recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a take-up device for paper or the like used mainly in a large recording apparatus such as an ink jet printer.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 11-246095 discloses a paper winding device used in a large printer such as an inkjet plotter in which the load applied to the drive shaft of the winding scroller is always constant.
[0003]
[Problems to be solved by the invention]
In a large recording apparatus, particularly when handling a large sheet, when the winding diameter of the sheet wound around the winding scroller increases, the weight on the winding scroller side increases. Therefore, a large torque is required at the start of the rotation of the winding scroller, and a large driving current is required for the winding motor. If the initial value of the drive current to the take-up motor is set to the maximum value corresponding to the maximum take-up diameter, the take-up operation can be performed reliably, but if the take-up diameter is small, The take-up scroller may rotate suddenly, and when the slack of the paper is taken up by the take-up scroller, an excessive pulling force acts on the grip part of the paper by the drive roller and the pinch roller, The grip position of the paper is shifted, and the print drawing operation is adversely affected.
The present invention aims to solve the above problems.
[0004]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention holds the drawing medium with a driving roller and a pinch roller, and sends the drawing medium in a predetermined transport direction by rotation of the driving roller, while scanning the drawing medium with a recording head. In a winding device for a recording apparatus that performs printing on a drawing medium and automatically winds the printed drawing medium on a winding scroller linked to a winding motor, the drawing medium on the winding scroller side start the test electricity to the winding motor and a predetermined amount of slack occurs, increases the current to the winding motor evening gradually stepwise, the rotation of the winding scroller begins, said winding at the start of rotation corresponding to the value of the current to the motor is switched to supply the predetermined small current required to the rotation of the winding scroller, winding scroller is the winding of the slack portion of plotting media End Then the rotation of the take-up motor is obtained a controller for controlling the winding motor to stop.
Further, according to the present invention, the memory of the controller includes a drive current value corresponding to the winding amount of the drawing medium wound on the winding scroller and a minimum amount necessary for the rotation of the winding scroller corresponding thereto. A current value table is stored, and when the winding scroller starts rotating, the controller starts energization of the winding motor based on the table from the current value at the start of the winding motor rotation. A minimum predetermined current value necessary for the rotation of the take-up scroller corresponding to the paper take-up amount of the scroller is switched.
According to the present invention, the predetermined small current value supplied to the minimum take-up motor necessary for the rotation of the take-up scroller is that the take-up force of the take-up scroller is a grip for the drawing medium of the drive roller and the pinch roller. It is characterized by being set to an appropriate value such that no deviation occurs.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
In FIG. 1, (2) is a platen made of a metal plate, and is fixed to a machine body (not shown) supported on a leg (not shown) of the ink jet recording apparatus. On the rear side of the lower part of the leg body, both end shaft portions (4a) of the roll paper supply scroller (4) on which the roll portion of the roll paper (102) is mounted are respectively arranged rotatably on the left and right sides of the leg body. It is mounted on the paired bearing members (6) and (8).
[0006]
In addition, on the lower front side of the leg, a pair of bearing members (12) (14) are arranged so that both end shaft portions (10a) of the roll paper take-up scroller (10) are rotatably arranged on the left and right of the leg, respectively. It is supported. The pair of bearing members (12) and (14) are rotatably supported by the legs, respectively, and one bearing member (12) is connected to the output shaft of the roll paper winding motor (16) through a power transmission mechanism. The other bearing member (14) is connected to the slit disk (19) of the encoder (18) that detects the rotational motion of the bearing member (14) via a power transmission mechanism. Below the take-up scroller (10), as shown in FIG. 3, a transmitting unit (21a) such as an infrared beam and a receiving unit (21b) for detecting slack of the drawn roll paper (102). A light transmission type slack detection sensor (21) is arranged.
[0007]
A paper guide (20) is disposed behind the platen (2), and a guide roller (22) extending in the direction perpendicular to the paper surface, that is, in the Y-axis direction in FIG. 1, is disposed behind the paper guide (20). The guide roller (22) is rotatably supported by the machine body. (24) is a Y-axis rail, which is horizontally disposed above the platen (2), and both ends thereof are fixed to the airframe via brackets. A Y cursor (26) (carriage) is movably attached to the Y-axis rail (24), and the Y cursor (26) is connected to the Y-axis drive motor via an endless steel belt. It is linked to the Y-axis drive device (28) arranged in
[0008]
A slit is formed along the Y-axis direction between the platen (2) and the paper guide (20), and a driving roller (30) is disposed in the slit. Both ends of the drive roller (30) are linked to an X-axis drive device (32) disposed on the machine body via a bracket. A pinch roller shaft is attached to the Y-axis rail (24) via an elastic mechanism (not shown) so as to be able to move up and down, and the pinch roller (34) rotatably fitted to the pinch roller shaft is The driving roller (30) is configured to be set to one of a state separated from the surface of the driving roller (30) and a state of elastic contact with the surface.
[0009]
A head base is fixed on one side of the Y cursor (26), and four ink jet recording heads (36) each having a large number of nozzles prepared for each ink color are attached thereto. . In the drawing, only one recording head is shown, and other recording heads are not shown. A sub tank (38) for solvent ink of four colors (black K, cyan C, magenta M, yellow Y), which is the same number as the recording head (26), is attached to the upper portion of the Y cursor (26). In the drawing, only one sub tank is shown, and the other sub tanks are not shown.
[0010]
As shown in FIG. 1, a manual valve (40) is attached to each of the sub tanks (38) on the substrate that supports the recording head (36). Each sub tank (38) is connected to the corresponding recording head (36) by a tube (42), and the ink discharge port (44) of each sub tank (38) is more than the ink receiving port of the corresponding recording head (36). Due to the difference in height, the recording head (36) is supplied with ink from the corresponding sub tank (38) by natural fall.
[0011]
Reference numeral (46) denotes four ink main tanks containing four colors of solvent inks, which are detachably disposed in a tank storage case provided on the leg side. In the drawing, only one ink main tank is shown, and the other ink main tanks are not shown. Each ink main tank (46) is connected to a corresponding sub tank (38) by a tube via a diaphragm pump (48), a filter and a manual valve (40). In FIG. 4, (62) is a negative pressure air pump, which is disposed in the airframe. The negative pressure air pump (62) is connected to each sub tank (38) by a tube via an air chamber, a two-way solenoid valve (66), a manifold, a branch tube, and a three-way solenoid valve (69).
[0012]
A pressure gauge (70) and a speed controller (72) are attached to the air suction path of the negative pressure air pump (62). The pressure gauge (70) and the speed controller (speed control valve) (72) are provided to control the negative pressure in the sub tank (38) with high accuracy. If the sub-tank (38) is held in a state where the negative pressure is high, the air suction path is closed to the outside air, so that the state where the negative pressure is high may be held as it is. . In order to prevent such a state, a speed controller (72) is provided in the present embodiment. By this speed controller (72), a mechanism in which air slightly flows into the air suction path from the outside is configured in the middle of the path, thereby enabling highly accurate control of the negative pressure.
[0013]
(74) is a positive pressure air pump, which is disposed in the airframe. The positive pressure air pump (74) is connected to each corresponding sub tank (38) by a tube via a regulator, a filter, a manifold, a branch tube, and a three-way solenoid valve (69). The sub tank (38) is provided with a sensor (83) for detecting the remaining amount of ink. The winding motor (16) and the pumps (48), (62) and (74) are connected to the controller (82) through drivers, respectively, and the speed controller (72), solenoid valves (66) (69), As shown in FIG. 4, the XY driving devices (32) and (28), the recording head (36), and other various electronic devices and devices are connected to the controller (82) and controlled by the controller (82). It is configured. The memory of the controller (82) stores a table (104) for determining a current value at which the winding scroller (10) starts rotating and a small current value for driving the winding scroller (10) thereafter. Has been.
[0014]
In the figure, (86) is a print head heater, (84) is a sub tank heater, (88) is a heater provided in an ink supply tube between the sub tank (38) and the print head (36), (89) ) Is a temperature sensor provided in the ink tube, (90) is a heater for heating the platen, (91) is a temperature sensor provided in the platen (2), and (92) is provided in each recording head (36). A temperature sensor (94) is a temperature sensor provided in the sub tank (38).
Next, the operation of this embodiment will be described.
In order to set the rolled-out portion of the roll paper (102) on the platen (2), the pinch roller (34) is raised, and the roll paper (102) is moved from the roll portion of the roll paper set on the supply scroller (4). Is inserted between the drive roller (30) and the pinch roller (34) through the platen (2), and then the pinch roller (34) is lowered to remove the pinch roller (34) from the roll paper ( 102) is elastically contacted with the driving roller (30) from above.
[0015]
As a result, the drawing medium is gripped by the drive roller (30) and the pinch roller (34), and the setting of the drawing medium is completed. The controller (82) performs an initial ink initial filling operation. During the initial ink filling, the recording head (36) returns to the home position, and the negative pressure air pump (62) is turned on. Since the main tank (46) is at a lower position than the sub tank (38), the ink in the main tank (46) is filled with the pump (48) to the sub tank (38) through a filter. When the filter is clogged, the safety valve works when the pressure in the tube on the downstream side of the diaphragm pump (48) reaches a predetermined pressure, and the ink is returned to the main tank (46) when the pressure reaches a certain level. It prevents liquid leakage.
[0016]
Further, when the ink is supplied to the sub tank (38), the pressure in the sub tank (38) becomes high, so that the negative pressure air pump (62) is normally operated in order to release this pressure. When the ink is filled in the sub tank (38), the controller first switches the three-way solenoid valve (69) from the negative pressure side to the positive pressure side and drives the positive pressure air pump (74). Thus, the positive pressure from the positive pressure air pump (74) is supplied to the sub tank (38), and the corresponding recording head (36) is filled with ink from the sub tank (38). When the ink is initially filled in the recording head (36), the positive pressure air pump (74) is stopped, the three-way solenoid valve (69) is switched to the negative pressure side, the two-way solenoid valve (66) is opened, The air suction path of the negative pressure air pump (62) is opened, and the inside of each sub tank (38) is held at a negative pressure. Thus, in the normal state, the sub tank (38) is maintained at a negative pressure by the negative pressure air pump (62), and the ink does not drip from the recording head (36), that is, does not leak.
[0017]
If the negative pressure in the sub tank (38) is too high, the ink is not supplied to the recording head (36), so the negative pressure is supplied from the sub tank (38) to the recording head via the ink supply path (42). It is kept to the extent that ink is naturally supplied. Specifically, the negative pressure state is properly managed by the pressure gauge (70), and control is performed so as to obtain a constant negative pressure. Further, since the value of the negative pressure air pump (62) is slightly fluctuated, an air buffering portion is provided by the air chamber, and a buffering action of pressure fluctuation is performed here.
[0018]
When the printer shifts to the drawing operation, the rolled-out portion of the roll paper (102) is conveyed on the platen (2) in the X-axis direction by intermittent rotation in one direction of the drive roller (30). The recording head (36) is driven on the basis of image information under the control of the controller, ejects ink, and reciprocates along the Y-axis rail (24) of the Y cursor (26) along the Y-axis. Then, the cut-out portion of the roll paper (102) is scanned, and the image information developed in the memory of the controller is visualized on the roll paper (102) surface. When the slack of the printed paper (102) discharged from the front of the platen (2) exceeds a certain amount during drawing, as shown in FIG. 3B, the slack detection sensor (21) detects the paper (102). To detect slack. As shown in FIG. 5A, the controller (82) starts with a small current a, and gradually increases the current value for the winding motor (16).
[0019]
When the bearing member (12) is rotated by the take-up motor (16), the shaft portion (10a) of the take-up scroller (10) is rotated in the paper take-up direction by the frictional force therewith. The rotation of the shaft (10a) is transmitted to the bearing member (14) in contact therewith. The rotation of the bearing member (14) is detected by the output of the encoder (8). When the take-up scroller (10) rotates in the take-up direction, the controller (82) drives the drive current to the take-up motor (16) based on the table (104) as shown in FIG. The current (SA) is reduced to a predetermined small current (SB). As shown in FIG. 6, the value of the small current (SB) is equal to the current value (d) when the winding scroller (10) starts rotating at the initial current value (d) at the fourth stage, for example. The corresponding current value (d ′) is set.
[0020]
The current values (a), (b), (c), (d), and (e) at which the winding scroller (10) started rotating are the winding diameter of the winding scroller (10), that is, the weight on the winding scroller (10) side. Corresponding to each of the current values (a), (b), (c), (d), and (e), the small current (SB) values (a ′), (b ′), (c ′), (d ′), (e) ') Indicates that when the paper (102) is wound around the take-up scroller (10), the impact load applied to the grip portion of the paper (102) between the drive roller (30) and the pinch roller (34) is reduced. It is set to a value that does not affect the grip of the drive roller (30) and the pinch roller (34) with respect to the paper (102) so as to be about 1 kgf to 2 kgf. The supply of the small current (SB) to the winding motor (16) is set to automatically stop when a predetermined time has elapsed after the start of the supply. The timing of stopping the take-up motor (16) may be based on the time when a paper winding load is applied to the take-up motor (16), and based on the output of the encoder (18). The time when the stop of the take-up scroller (10) is detected may be used as a reference.
[0021]
【The invention's effect】
Since the present invention is configured as described above, the winding operation can be performed smoothly, and the influence on the grip portion of the drawing medium can be effectively reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory side view of a recording apparatus.
FIG. 2 is an explanatory view of the appearance of the main part of the present invention.
FIG. 3 is an explanatory diagram of the present invention.
FIG. 4 is a functional block explanatory diagram of the present invention.
FIG. 5 is an operation explanatory diagram of the present invention.
FIG. 6 is an explanatory diagram of a table.
[Explanation of symbols]
2 Platen 4 Roll paper supply scroller 6 Bearing member 8 Bearing member 10 Roll paper take-up scroller 12 Bearing member 14 Bearing member 16 Take-up motor 18 Encoder 19 Slit board 20 Paper guide 21 Slack detection sensor 22 Guide roller 24 Y-axis rail 26 Y cursor 28 Y-axis drive device 30 Drive roller 32 X-axis drive device 34 Pinch roller 36 Recording head 38 Sub tank 40 Manual valve 42 Ink supply path 44 Ink discharge port 46 Ink main tank 48 Diaphragm pump 82 Controller 83 Remaining amount detection sensor 84 Heater 86 Heater 88 Heater 90 Heater 92 Temperature sensor 94 Temperature sensor 102 Roll paper

Claims (3)

The drawing medium is held between the driving roller and the pinch roller, and the drawing medium is sent in a predetermined transport direction by the rotation of the driving roller. On the other hand, the drawing medium is scanned by the recording head to perform printing on the drawing medium. In a winding apparatus for a recording apparatus in which a drawing medium is automatically wound around a winding scroller linked to a winding motor, if a predetermined amount of slack occurs in the drawing medium on the winding scroller side, When power supply is started and the current to the winding motor is gradually increased stepwise and the winding scroller starts rotating , the winding corresponding to the current value to the winding motor at the start of the rotation Switch to supplying a predetermined small current necessary for the rotation of the scroller, and when the winding scroller completes winding of the slack drawing medium, the winding motor stops rotating. Recording apparatus for winding apparatus characterized by comprising a controller for controlling the winding motor as. In the memory of the controller, there is a table of a drive current value corresponding to the winding amount of the drawing medium wound on the winding scroller and a corresponding minimum current value necessary for rotating the winding scroller. When the take-up scroller starts to rotate, the controller energizes the take-up motor based on the table from the current value at the start of the take-up motor rotation, and takes up the paper of the take-up scroller. The winding device for a recording apparatus according to claim 1, wherein the winding device is switched to a minimum predetermined small current value required for rotation of the winding scroller corresponding to the amount. The predetermined small current value supplied to the minimum take-up motor necessary for the rotation of the take-up scroller means that the take-up force of the take-up scroller does not shift the grip of the drive roller and the pinch roller with respect to the drawing medium. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is set to an appropriate value.

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