JPH04115663U - Printer media transport device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent printing misalignment due to backlash of a rotation transmission mechanism of a feed roller during a reverse media feeding operation in a printer. [Structure] In the medium reverse operation, the drive motor 7 is reversed by the reversal control unit 21 so that the medium 1 is reversed by a predetermined distance longer than the distance to which the medium 1 should be reversed, and then the forward rotation control unit 22 reverses the drive motor 7 so that the medium 1 is The drive motor 7 is rotated in the normal direction so as to be sequentially fed a predetermined distance. [Effect] Eliminates backlash in the drive transmission mechanism caused by belts, gears, etc. during reverse media feeding operation, allowing printing at accurate printing positions on the media.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a media conveyance device for a printer, and in particular, a belt and a belt for conveying media. A printer that has a backlash absorption function using a motor drive transmission mechanism such as gears. The present invention relates to a medium transport device.

0002

[Conventional technology]

Conventionally, in printers, as shown in FIG. The feed roller 2 is equipped with a drive motor, etc., with the medium 1 sandwiched between the feed roller 3 and the feed roller 3. It is rotated by the drive unit, and this rotation feeds the medium 1 forward and backward, and the platen Printing is performed by a printer head 4 facing a print head 5. And medium 1 When printing in reverse feed (reverse line feed), simply move the feed slot in the same way as in forward feed for media The medium 1 was fed by rotating the roller 2.

0003

[Problem that the idea aims to solve]

However, the media transport function of this conventional printer requires belts and gears. Because there is backlash in the drive transmission mechanism of the drive motor due to There was a drawback that the printing position was shifted when printing.

0004 This invention was devised in view of the above-mentioned problems. ) Backlash caused by the rotational drive transmission mechanism of the feed roller such as belts and gears during printing. This is a printer that removes the padding and allows printing at precise printing positions. The purpose is to provide a media transport device.

[0005]

[Means to solve the problem]

In order to achieve the above object, the printer media device of the present invention has a feed roller. A feed shaft is provided corresponding to the feed roller. The tension roller presses the print medium against the roller, and the feed shaft rotates forward and Reverse the rotation to feed the media between the feed roller and tension roller. In a printer's media transport device, which is equipped with a drive unit that performs forwarding and reverse feeding, Drives the media so that it is fed a predetermined distance longer than it should be during reverse feeding. a reversal control section that controls the reversal of the media; and a reversal control section that controls the reversal of the The configuration includes a forward rotation control section that controls the forward rotation of the drive section so that the feed is performed in minute order. .

[0006]

[Effect]

According to the printer media conveyance device having the above configuration, when the media is reversely fed, the drive The section is reversely controlled to advance the media an extra predetermined distance, and then The forward rotation is controlled to return a fixed distance, so during this forward rotation, the rotation transmission mechanism of the drive unit backlash is removed, and the problem of the media shifting from its original printing position removed.

[0007]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. Figures 1 and 2 are books FIG. 3 is a plan view and a side view showing a media conveying device of a printer according to an embodiment of the invention. FIG. 6 is a diagram showing a state during a medium reverse feeding operation.

[0008] As shown in FIGS. 1 to 3, the media conveying device of the printer according to the embodiment is The medium 1 is sequentially fed between the platen 5 and the printer head 4 facing the platen 5. and send it backwards. In the figure, 10 is a feed shaft, and the medium A plurality of rows are provided in the conveying direction of the body 1, and each row is provided with several feed rollers 2. 3 is provided corresponding to the feed roller 2 and presses the medium 1 against the feed roller 2 It is a tension roller.

[0009] The feed shaft 10 rotates in the forward and reverse directions according to the forward and reverse rotation of the drive motor 7. The drive motor is configured to transport the medium 1 between the drawer roller 2 and the tension roller 3. 7 via a transmission mechanism. This transmission mechanism includes a feed shaft 10 is provided with a timing pulley 9, and the timing pulley 9 and the rotating part of the drive motor 7 are connected to each other. A belt 8 for transmitting rotation is stretched between the two.

0010 Further, this conveyance device includes a control section 20 that controls the rotation of the drive motor 7. There is. When the medium 1 is fed backwards, this control section 20 controls A reversal control unit 21 that reverses the drive motor 7 so that the drive motor 7 is reversely fed by a longer distance α; The drive motor is configured so that the medium 1 is forwarded by a predetermined distance α after the reverse rotation control by the rotation control unit 21. The normal rotation control section 22 rotates the motor 7 in the normal direction.

[0011] Therefore, according to the medium conveyance device according to this embodiment, first, the drive motor 7 The rotation causes the belt 8 and timing pulley 9 to rotate. This rotation causes The feed shaft 10 and the feed roller 2 rotate, and the feed roller 2 and feed roller 2 rotate. The medium 1 (paper) sandwiched between the feed shaft 3 and the feed shaft 3 is conveyed.

0012 In this case, in the reverse feed operation, a predetermined distance is added to the distance to be reversed (number of steps). Execute reverse feed for the distance α (number of steps) added. Next, the predetermined distance α (step The media is then forwarded by the number of pages) and returned to the original position where it should be reversed.

[0013] As a result, even if the media position is set by reverse feed operation, the result is forward feed. Since medium 1 is set by structure backlash is removed. Therefore, occurrence of printing misalignment can be prevented. become.

[0014] Note that the above specified distance α (step) depends on the dips of the device (printer). It can be set arbitrarily with the switch.

[0015]

[Effect of the idea]

As explained above, according to the media conveyance device of the printer of the present invention, the media is reversely fed. In operation, perform a backward feed operation for a predetermined distance, then forward feed for a predetermined distance. The backlash that occurs during the media reverse movement is eliminated. It can be removed using firmware (FW) and can be printed at the correct printing position on the media. have

[Brief explanation of drawings]

FIG. 1 is a plan view showing a medium conveyance device of a printer according to an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a diagram showing a state of the medium transport device according to the embodiment during a medium reverse feeding operation.

FIG. 4 is a diagram illustrating a state in which a medium is reversely fed in a medium conveying device of a conventional printer.

[Explanation of symbols]

1 Medium 2 Feed roller 3 Tension roller 4 Printer head 5 Platen 7 Drive motor 8 Belt 9 Timing pulley 10 Feed shaft 20 Control section 21 Reverse control section 22 Forward rotation control section

Claims (1)

[Scope of utility model registration request] 1. A feed shaft having a feed roller, a tension roller provided corresponding to the feed roller and pressing a printing medium against the feed roller, and a tension roller that rotates the feed shaft in normal and reverse directions to rotate the feed roller. In a printer's media conveying device, which is equipped with a drive unit between a tension roller and a drive unit that forwards and reverses the medium, when the medium is reversely conveyed, the medium is conveyed backwards for a predetermined distance longer than the distance that the medium should be conveyed backwards. A printer comprising: a reverse rotation control section that controls the drive section in the reverse direction; and a forward rotation control section that controls the drive section in the forward rotation so that the medium is forwardly fed by a predetermined distance after the reverse rotation control section performs the reverse rotation control. Media transport device.