JPS5912881A - Paper feeding mechanism for printer - Google Patents

Abstract

PURPOSE:To obtain a paper feeding mechanism making the setting of papers easier and requiring no tension adjustment by a method in which a tractor and a prush roller are set for a continuous paper and are controlled by a specific mode. CONSTITUTION:When a continuous paper 3 is fed forward (i), a tractor 5 is turned toward the direction of arrow A, a platen 2 is turned with a smaller peripheral speed than the feeding speed of the tractor 5, and the paper 3 is run without causing slackening while giving a friction force between an idler 7 and a drive roller 6 with one-way coupler in a turning prohibition state. In retracting the continuous paper 3(ii), the tractor 5 is turned toward the direction of B, the roller 6 is turned with a greater peripheral speed than the feeding speed of the tractor 5, and the paper 3 is run without slackening while slightly slipping it between the roller 6 and the idler 7(the running speed is regulated by the feeding speed of the tractor 5).

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The printer paper feed mechanism according to the present invention relates to a tractor and tensilon roller for feeding continuous paper in a serial printer, and particularly relates to tension rollers for preventing the occurrence of slack in paper.

(b) - Prior art and problems - When the continuous paper is rolled up on the platen, when printing for one line is completed, the continuous paper is fed by a predetermined width (line feed). In the conventional technology, holes are continuously punched at predetermined intervals on both ends of continuous paper perpendicular to the feeding direction, and then these holes are engaged with the feed fin of a tractor, and the feed rotation of the tractor The paper is being fed (line feed). At this time, the person/company responsible for the tractor arrangement and the form, for example, Figure 1 (a) and the same figure (
It was done as in b).

In the same figure (a), as shown in the figure, the paper 3 is continuously engaged with the upper and lower surfaces of one tractor 5, and the paper pool (not shown) is
First, the continuous paper 3 pulled out from the tractor is engaged with the pin 5a on the lower surface of the tractor, and then the tensilon is applied (pressure P is applied in the direction of the arrow at L4, wrapped around the platen 2 to face the printing unit 1, and then the continuous paper 3 is pulled out from the tractor 5. The continuous paper was rotated by sending the tractor 5 in the direction of arrow A when moving forward and arrow B when moving backward based on a signal from a drive control section (not shown).

The structure was such that the slack in the paper at this time was removed by the pressure P of the teleshiron bar 4. Further, as shown in FIG. 5(b), two tractors 5.5' are arranged in the front and back (or up and down) direction of the platen, and the feed rotational speeds of the two tractors 5.5' are controlled by a drive control unit (not shown). Synchronization was used to prevent paper pressure from sagging. However, in the same figure (a), adjusting the pressure P of the teleshiron bar is troublesome, and in the same figure (a), it is troublesome to adjust the pressure P of the teleshiron bar.
BL had the disadvantage that the entire printing device could be enlarged. Furthermore, the same figure (a).

In case (b), one or two tractors 5 or 5°5
' It took time and effort to engage the paper twice.

(c) Object of the Invention In view of the above-mentioned problems, an object of the present invention is to provide a paper feeding mechanism that has a simple configuration and allows easy paper setting.

(rl) Structure of the Invention The structure of the printer paper feeding mechanism according to the present invention that achieves the above object includes a tractor that feeds continuous paper wound around a platen, and a tractor that transports the continuous paper from a pool portion of the continuous paper to the position of the platen. A presser roller that is provided at a guiding position to apply a tensile seal to the continuous paper, and a presser roller 2.
and a motor for driving the tractor, the presser roller is provided with a one-way rotation locking mechanism and a rotational speed control means for controlling the transmission of rotational force from the drive motor, and the continuous paper advances. At times, the forward feed speed of the tractor is slower, and when the continuous paper is moved backward, the tractor is rotated faster than the backward feed speed.

(e) Examples of the invention (: The present invention will be explained below using diagrams.

FIG. 2 is an explanatory diagram of a printer paper feeding mechanism according to an embodiment of the present invention. FIG. 2(a) is an overall layout diagram, and FIG. , 3 is continuous paper, 5 is a tractor, 5a is a fin, 6 is a drive roller with one-way locking,
7 is an idler, 61 is an inner diameter roller, 61a is a protrusion, 62
63 is a locking tool, 64 is a frame, 65 is a spring, A.

B is the feeding direction of the continuous sheet O. To explain the feeding operation with reference to FIG. At this time, the idler 7, which is free to rotate, is holding and pressing the continuous paper 3 against the drive roller 6 with one-way locking, and the drive roller 6 with one-way locking is pressed against the drive roller 6 with one-way locking, as shown in FIG. The mechanism to be described prevents rotation and allows sliding on the continuous paper 3. The structure is such that the smooth friction at this time gives tension to the continuous paper. Furthermore, the platen is also given a rotation speed that is slower than the feed rotation of the tractor 5 by a drive control unit (not shown). Next, when the continuous paper is retreating, the tractor 5 is sent and rotated in the direction of arrow B. At this time,
The one-way locking roller 6 is fed and rotated in the direction of arrow B' by a signal from a drive control section (not shown). At this time, the feed rotation speed B (9 feed rotation speed of the tractor 5) and B' (the feed rotation speed of the one-way locking drive roller 6) are set such that B'>B. Therefore, the backward speed of the continuous paper 3 is regulated by the feed rotation speed of the tractor 5, and the idler 7
Adjust the pressure from the

FIG. 6B is an enlarged view showing an embodiment of the one-way locking drive roller 6. The outer U-roller 62 and the inner roller 61 are fixed, and the inner roller 61 has a plurality of protrusions 61a. (three locations in the figure (b)). A locking tool 63 is provided so as to come into contact with the inner diameter roller 61, and a spring 65 is provided at the base of the locking tool 63 so that the locking tool 63 can move in and out. Therefore, rotation of the one-way locking drive roller O in the direction of arrow A is prohibited because the locking tool 63 hits the vertical surface of the projection 61m, and when rotating in the direction of arrow B, the locking tool 63 resists the spring 65. This is a configuration in which the plate surface of the protrusion 61a is prevented from slipping and rotation is not inhibited.In this embodiment, a spring is provided on the locking tool side.
It goes without saying that a spring may be provided on the protrusion side of the inner roller, and that the one-way locking structure can be realized without relying on this embodiment.

(f) Effects of the Invention As described above in detail, the printer paper feed mechanism according to the present invention has the advantage that continuous paper setting is easy and paper adjustment is not required. Further, even when moving forward and backward, paper sagging can be prevented by appropriate sliding friction, which has the effect of realizing accurate paper feeding.

[Brief explanation of the drawing]

Figure 1 is a diagram of the paper feeding mechanism according to the prior art;
1. is a configuration diagram with a tensile strength pump, and (b) is a configuration diagram with a 2λ tractor arrangement. Figure 1 is a diagram of the paper feeding mechanism of the present invention, Figure (a) is an overall explanatory diagram, Figure (b) is
is an enlarged view of the main parts. In the figure, 1 is the printing section, 2 is the platen, and 3 is the printing part.
is continuous paper, 5.5' is a tractor, 5a is a pin, 6 is a one-way locking structure moving roller, 7 is an idler, 61 is an inner diameter roller, 61a is a protrusion, 62 is an outer diameter roller, 63 is a locking tool,
64 is a frame, and 65 is a spring. Flute 2

Claims (1)

[Claims] (1) A tractor that sends continuous paper wound around a platen, and a presser roller that is provided at a guide position that guides the continuous paper from the pool of the continuous paper to the platen position and applies tensilon to the continuous paper; In a printer paper feeding mechanism including the presser roller and a motor for driving the tractor, the presser roller is provided with a one-way rotation locking mechanism and a rotational speed control means for controlling transmission of rotational force from the drive motor, A printer paper feeding mechanism characterized in that it is configured to rotate at a speed slower than the forward feed speed of the tractor when the continuous paper moves forward, and faster than the backward feed speed of the tractor when the continuous paper moves backward.