JP2595966B2 - Printer paper feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a paper feeder for a printer, and more particularly, to a paper feeder for a printer characterized by continuous paper feeding.

(Prior Art) When performing recording and writing on continuous paper, generally, the paper feed roller disposed on the upper side of the platen in the paper feed direction is set in a release state, and then the continuous paper is fed to the printing unit by a push tractor. The continuous paper is pulled out from the printing unit using a pull tractor or a pull sprocket.

However, in the case of paper feed using a push tractor, a load is applied when a perforation passes through a portion of a paper pressing roller provided on the lower side of the platen in the paper feed direction, so that a load is applied.
When the continuous paper floats from the platen surface, so-called paper floating occurs, which causes problems such as disturbed paper feed pitch and printing noise, and in the case of paper feed using a pull sprocket, Because the force that presses the continuous paper on the far side of the platen in the paper feed direction does not act, paper floats when the perforation passes through the printing unit, and paper feed occurs in the same way as in the case of paper feed using a push tractor. This causes problems such as disturbing the pitch and generating printing noise.

On the other hand, in order to solve such a problem, an apparatus using a push tractor and a pull tractor, such as the apparatus disclosed in Japanese Utility Model Laid-Open No. However, since the above-mentioned problem does not occur because of the action of the above, on the other hand, when loading the continuous paper, the holes on both sides of the continuous paper must be hooked on the respective claws of the push tractor and the pull tractor. Is difficult to load in a tensioned state, and there is a problem that slack may occur on the platen surface.

(Problems to be Solved by the Invention) The present invention has been made in view of such a problem, and an object thereof is to stabilize continuous paper without causing slack in both push and pull tractors. Another object of the present invention is to provide a new paper feeding device capable of performing paper feeding by mounting the paper feeding device.

(Means for Solving the Problems) That is, according to the present invention, as a paper feeding device of a printer for achieving such a problem, a driving force transmission to at least a continuous paper drawing means disposed on a lower side in a paper feeding direction of a platen is provided. A part of the system is provided with means for interrupting the driving force to the drawing means by manual operation, and when loading continuous paper, the drawing means can be manually operated to tension the continuous paper. It is.

(Embodiment) Therefore, an embodiment illustrated below will be described.

1 and 2 show an example of a paper feed mechanism of a printer equipped with the apparatus of the present invention. The paper feed mechanism is a push tractor 9 provided on the upper side of the platen 1 in the paper feed direction with the platen 1 interposed therebetween. And a pull sprocket 10 provided detachably on the lower side in the paper feeding direction. Further, in the paper feeding path to the print head 3, the target of paper feeding is either cut paper or continuous paper. A paper feed lever 5 for bringing the paper feed roller 4 into and out of contact with the platen 1 is provided, and a paper pressing roller 2 for preventing a slack of the paper is provided in a paper discharge path from the platen 1 to the pull sprocket 10. It is arranged.

In the drawings, reference numerals 6 and 7 denote paper guide plates, 8 denotes a platen cover, and 11 denotes a paper guide auxiliary plate.

On the other hand, FIG. 2 shows a mechanism for transmitting the driving force to the push tractor 9 and the pull sprocket 10 described above. A common paper feed intermediate gear 14 meshes with a pinion 13 fixed to the shaft of a paper feed motor 21. On the other hand, a tractor gear 19 integral with the push tractor 9 is engaged with the intermediate gear 14 via a tractor intermediate gear 18 which will be described later.
On the other hand, a platen gear 15 integral with the platen 1 meshes with the paper feed intermediate gear 14, and a sprocket gear 17 on a sprocket frame 22 which can be disengaged from the side frame 20 is engaged with the platen gear 14. 16 are in mesh.

By the way, the tractor intermediate gear 18 for transmitting the driving force to the tractor gear 19 is such that the tractor gear 19 can be disconnected from the driving force transmission system when the continuous paper 12 is loaded. As shown, the tractor intermediate gear 18 is always meshed with the tractor gear 19 while being urged by the intermediate gear spring 23.
It is slidably mounted on the intermediate gear shaft 24 so as to be able to break the engagement with the shaft 19.

On the other hand, as shown in FIG. 4, the above-mentioned sprocket gear 17 is always held in mesh with the sprocket intermediate gear 16 by a sprocket gear spring 16, and if necessary, manually breaks the mesh. It is slidably mounted on the sprocket drive shaft 25 so that

In the embodiment configured as above, the continuous paper
First, the sprocket frame 22 is attached to the side frame 20 of the printer.

As a result, the driving force is transmitted to the pull sprocket 10 via the sprocket intermediate gear 16, and then the paper pressing roller 2 is rotated and displaced in the counterclockwise direction in the drawing to release from the paper conveyance path. In addition, the pair of left and right push tractors 9 is positioned in accordance with the paper width, and the holes on both sides are fitted to these pins to set the continuous paper 12.

Then, the tractor intermediate gear 18 and the tractor gear 19
After pulling the leading end of the continuous paper 12 toward the pull sprocket 10 while rotating the platen 1 in the paper feed direction,
Left and right pull sprockets 10 positioned according to the paper width
Is set with the continuous paper 12 slackened.

Finally, the paper pressing roller 2 is rotationally displaced in the paper pressing position, that is, in the clockwise direction in the figure, and then the sprocket gear 17 is displaced to the left in the figure while opposing the sprocket gear spring 26, so that the sprocket Disengage the gear 16 from the gear. Then, under the condition where the driving force is cut off, the pull sprocket 10 is rotated in the paper feed direction to remove the slack of the continuous paper 12, and finally the sprocket gear 17 is returned to the original position by the sprocket gear spring 26. To engage with the sprocket intermediate gear 16.

Through this series of loading operations, the continuous paper 12 is loaded without slack from the push tractor 9 through the platen 1 to the pull sprocket 10, so that the continuous paper 12 is conveyed while keeping the feed amount and the draw amount constant. To perform the necessary recording and writing.

(Effects) As described above, according to the present invention, in a device in which continuous paper is fed by a feeding means and a drawing means, at least a part of the driving force transmission system leading to the drawing means cuts off the driving force. Since the continuous paper is loaded into the feeding means and the drawing means, and the drawing means is rotated manually, the continuous paper passing through the printing unit can be properly tensioned. As a result, it is possible to ensure a proper paper feed and to prevent the occurrence of abnormal noise or the like during printing.

[Brief description of the drawings]

FIG. 1 is a view showing a paper feed mechanism of a printer to which the present invention is applied, FIG. 2 is a view showing a driving force transmission system of the paper feed mechanism, and FIG. 3 and FIG. It is a figure showing one example of the present invention about each drive power transmission system of a pull sprocket. 1 ... Platen, 9 ... Push tractor 10 ... Pull sprocket, 16 ... Sprocket intermediate gear 17 ... Sprocket gear, 18 ... Tractor intermediate gear 19 ... Tractor gear

Claims (2)

(57) [Claims] 1. A printer provided with means for feeding and drawing out continuous paper by engaging holes formed in side edges of continuous paper on the upper side and the lower side in the paper feeding direction with a platen interposed therebetween. The paper feeder for a printer according to claim 1, wherein at least a part of the drive power transmission system leading to the drawer is provided with means for interrupting the drive force transmission to the drawer by manual operation. 2. A paper for a printer according to claim 1, wherein means for cutting off the driving force transmitted by said manual operation is interposed also in a part of the driving force transmission system leading to said feeding means. Feeder.