JPH07295Y2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a printer as a printing device such as a computer or a word processor, and more particularly to a paper feeding mechanism of the printer.

<< Prior Art >> Conventionally, as a paper feeding mechanism of a printer, for example, as shown in FIG.
As shown in the schematic side view and front view of the main part of FIG. 6, in the paper feeding mechanism of the printer, a large-diameter paper feeding roller 1 for feeding the paper to the platen portion of the printer is provided at predetermined intervals with respect to the platen portion. A plurality of small rollers 2a, 2b for pressing the paper against the paper feed roller 1 are arranged in front of and under the lower side of each paper feed roller 1 so as to be supported by the small roller mount 3. There is. The small roller mounting base 3 presses the small rollers 2a and 2b against the paper feeding roller 1 by the elastic member 4 to press the paper to the paper feeding roller 1, or when the paper is inserted, the small roller mount 3 moves from the small roller to the small roller. It is configured to be movable so as to separate 2a and 2b.

<< Problems to be Solved by the Invention >> However, in the paper feed mechanism of the printer having the conventional configuration, as shown in FIG. 6, the small rollers 2a and 2b and the small roller mount 3 for the paper feed roller 1 are arranged. Looking at the mounting configuration of, the small roller mounting base 3 is formed to be smaller than the width of the paper feeding roller 1 in the direction of the axis 5 of the paper feeding roller 1. Therefore, when the paper 6 is inserted between the paper feed roller 1 and the small rollers 2a and 2b and the paper is fed, the paper 6 is released from the pressing of the rear small roller 2b in the feeding state, Only the small roller 2a presses the paper feed roller 1. This is because it is necessary to ensure a gap between the small roller mount 3 and the paper feed roller 1. Therefore, when the paper 6 comes off the rear small roller 2b, the end of the paper 6 ends. Is separated from the paper feed roller 1 and extends toward the side of the small roller mounting base 3 to be displaced, and this displacement fluctuates the paper feed load and disturbs the paper feed pitch, resulting in misalignment of printing. This problem has been particularly noticeable in the case of strong paper such as postcards.

<< Means for Solving the Problems >> The present invention has been devised to solve the above problems. The means is to mount a small roller in the arrangement of a paper feed roller, a small roller and a small roller mount. Small rollers are arranged on the front end side and the rear end side of the base, and side walls are formed on the side surface between both small rollers of the small roller mount so that the horizontal width of the small roller mount is larger than the horizontal width of the paper feed roller. However, the paper feed roller and the side wall protruding from the paper feed roller of the small roller mounting base sandwich the paper in a staggered manner so that the paper abutted on the paper feed roller is always lightly loaded. And

<Operation> According to the paper feeding mechanism of the printer of the present invention having the above-described configuration, when inserting and feeding the paper, the paper is pinched between the paper feeding roller and the side wall of the protruding portion of the small roller mount. As a result, a light load is always applied, and fluctuations in the paper feed load are prevented.

<< Embodiment >> Next, an embodiment of the present invention will be described with reference to the drawings, with the same parts as those of the conventional part given the same reference numerals.

1 is a schematic side view of a main part of a paper feeding mechanism of a printer embodying the present invention, FIG. 2 is a sectional view taken along the line AA, FIG. 3 is a front view, and FIG. 4 shows its disassembled state. It is a schematic perspective view. As shown in the figure, the paper feed mechanism includes a paper feed roller 1 and
A small roller 2a on the front side and a small roller 2b on the rear side for pressing the inserted and fed paper 6, a small roller mount for holding these small rollers 2a, 2b at both ends, and a small roller mount 7 are provided. An elastic member 4 for movably pressing the paper feed roller 1 via the small rollers 2a and 2b. Here, the small roller mount 7 is the second
As shown in FIGS. 3 and 4, a protrusion having a lateral width larger than the axial lateral width of the paper feed roller 1 and having an upper side portion 7b having a diameter equal to or smaller than the outer diameter of the paper feed roller 1. A side wall 7a is provided, and the small rollers 2a and 2b are formed and held by rollers having a diameter that does not protrude from the upper side 7b of the protruding side wall 7a of the mounting base 7.

Next, the operating state of the paper feeding mechanism according to the present invention will be described. As shown in FIGS. 1 and 2, the paper feed roller 1
The paper 6 inserted and fed between the small rollers 2a and 2b is pressed and held by the paper feed roller 1 and the small rollers 2a and 2b, and at the same time, the paper 6 projects from the paper feed roller 1 and the small roller mount 7. A light load is applied by being sandwiched between the upper side portion 7b of the side wall 7a. Therefore, a double load is applied in addition to the load applied by the small rollers 2a and 2b, the end portion of the paper 6 is fed, and the paper 6 is fed between the paper feed roller 1 and the rear small roller 2b. Even if the pressure is released, the paper 6 is always sandwiched between the paper feed roller 1 and the upper side portion 7b of the side wall 7a of the protruding portion, and a light load is applied to the end portion thereof.
The end of the paper 6 does not move away from the paper feed roller 1.

<Effect of device> Therefore, according to the paper feed mechanism of the printer of the present invention having the following configuration, the paper inserted and fed into the paper feed roller has a protrusion formed to be larger than the lateral width of the paper feed roller. Since the upper side of the small roller mount with the side wall is sandwiched between the paper feed roller and a light load is constantly applied, the paper feed roller and the rear small roller are pressed. Even if is released, the end portion thereof is separated from the paper feed roller and is not displaced, thereby suppressing the print pitch disorder due to the load variation due to the variation of the bending R of the paper and the print pitch disorder due to the spring property of the paper, and Can be prevented. Further, the small roller mount is provided with a portion projecting from the paper feed roller, and since this portion and the paper feed roller produce the above effect, contact such as contact due to a difference in parts precision between the small roller mount and the paper feed roller may occur. It is possible to prevent the harmful effect, and further, when the small roller is released, the small roller mounting base can be sufficiently released, and the present invention can be implemented without increasing the cost with respect to the conventional mechanism.

[Brief description of drawings]

FIG. 1 is a schematic side view of an essential part showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA, FIG. 3 is a schematic front view, and FIG. 4 is a perspective view showing a disassembled state. FIG. 6 is a schematic side view of a main part showing a conventional example, and FIG. 6 is a front view thereof. 1 ... paper feed roller, 2a ... small roller at front end, 2b ... small roller at rear end, 4 ... elastic member, 6 ... paper, 7 ... small roller mount, 7a ... side wall of protrusion, 7b …… Upper part.

Claims (1)

[Scope of utility model registration request] 1. A paper feed mechanism of a printer comprising a paper feed roller, a small roller for pressing the paper against the paper feed roller, and a small roller mount for holding the small roller, wherein the small roller mount is a tip. Side and rear end side, the small rollers are respectively arranged, and side walls between the small rollers of the small roller mounting base are provided with side walls so that the lateral width of the small roller mounting base is larger than the lateral width of the paper feeding roller. And a configuration in which the paper feed roller and the side wall protruding from the paper feed roller of the small roller mounting base sandwich the paper in a staggered manner, and always apply a light load to the paper abutting on the paper feed roller. A printer characterized by the above.