JPS6023074A - Paper delivery apparatus of printer - Google Patents

Abstract

PURPOSE:To secure the precision of parts and assembly and to get rid of troubles such as the oblique motion of blank, jamming, etc. in feeding paper, by arranging plural guide plates side by side in the axial direction of platen. CONSTITUTION:Plural pieces of guide plates 2 of the same shape supporting the axial ends 3a, 4a, of delivery rollers 3, 4 by cutting risers 2d are arranged side by side and pushed up with the spring plates 7 accordingly arranged side by side. The U-shaped projections 2c of guide plate 2 are, in a guide manner, loaded into the groove 12 provided to a guide bearing component 11. Both ends and the central part of operation axis 5 are supported with the bearing components 11 and a gear 6 is mounted to one end thereof. The delivery rollers 3, 4 supported with the guide plates 2 come in pressured contact with the platen 1. A pair of guide plates 2 is respectively operated individually to the platen 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Use The present invention is applicable to printing devices such as typewriters and printers.

A conventional paper feeding device will be described below.

The conventional paper feeding device that has been widely used up until now is shown in FIG. ) and four actuating arms 26
It has an actuating arm support shaft 27, requires an actuating plate 3° and a lever 17 for simultaneously actuating it, and also requires four feed roller pressure contact coil springs 29. With such a complex structure consisting of many parts, there are major problems such as high cost, the amount of space occupied by the components, and the complexity of manufacturing and assembly.

The present applicant proposed a solution to such problems in Japanese Patent Application No. 1989-89432, but this was
As shown in the exploded view in the figure, the guide plate 18 supporting the two sets of feed rollers 3 and 4 is pressed against and separated from the platen 1, so that all the feed rollers are pressed against and separated from the surface of the platen 1 at the same time. This paper feeding device has two sets of four feeding rollers 3,
4 is integrally supported, in order to keep the pressing force of the feed rollers 3 and 4 against the platen 1 uniform on all rollers, it is necessary to ensure sufficient accuracy of the arc shape over the entire length of the guide plate 18. In addition, it is necessary to ensure the accuracy of the opposing positions of each of the support holes 18a, which requires a high level of technical skill in manufacturing, and it is extremely difficult to ensure these accuracy due to the long overall length. Met.

Furthermore, even if accuracy is ensured, it is difficult to equalize the pressing load of each roller to the platen due to the occurrence of deflection due to the pressure contact of the feed rollers 3 and 4 to the platen 1 during use, and as a result, The drawback is that problems such as paper skewing and jamming are often observed during paper feeding.

In addition, in order to press the feed rollers 3 and 4 against the platen 1 and further separate them, the operating shaft 19, which has notches 19a in several places to form a semicircular arc, and the guide plate 18 are usually pressed upward. The spring plate 7 is pressed down when the actuating shaft 19 is rotated, and lowers the guide plate 18. However, in order to attach the actuating shaft 19, the actuating shaft is attached to the support protrusion 22 of the base plate 15. When inserting into the hole 22a, since the actuating shaft has a plurality of notches 19a, the spring plate 7 has to be inserted gently downward each time the notch 19a is reached, which makes assembly time-consuming. This was the case.

Purpose of the Invention The present invention solves the above-mentioned conventional problems. It is easy to ensure accuracy of parts and assembly, and the assembly is simple. Moreover, the present invention eliminates problems such as skewing and jamming of paper during paper feeding. The purpose of the present invention is to provide a paper feed device for a printing device that does not require a paper feed device.

Structure of the Invention The present invention includes a platen, a feed roller, an arc-shaped guide plate that supports the feed roller and guides recording paper in the circumferential direction of the platen, and a platen that presses the feed roller against the platen. a spring plate interposed between the guide plate and the substrate; an operating shaft that acts on the spring plate to move the feed roller away from the platen against the elastic force of the spring plate; The guide plate has a guide bearing member attached to the substrate so as to support the guide plate and guide the guide plate, and a plurality of the guide plates are arranged side by side in the axial direction of the platen. By arranging a plurality of guide plates side by side, the overall length of each guide plate can be shortened and its machining accuracy can be easily ensured.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below. Referring to FIGS. 3, 4, 6, and 6, each of the two guide plates 2 has a long hole 2a.

Each of the feed rollers 3 and 4 has a cut-and-raised cut-out 2d at both ends in the longitudinal direction, and the shaft ends 3a and 4a of the feed rollers 3 and 4 are rotatably supported in support holes provided in the cut-and-raised cut and raised 2d. feed roller 3
. It is urged to be pushed up by a band-shaped spring plate 7. It is preferable that the gap between the adjoining portions of each guide plate 2 be as narrow as possible.

The spring plate 7 has a hole 8 in its center, and a push-up piece 9 having a notch 10 at both ends thereof. The substrate 16 has holes on its flat surface at positions corresponding to the holes 8.
Each guide bearing member 11 has a protrusion 16, and three guide bearing members 11 are provided at positions corresponding to a pair of U-shaped protrusions 2c provided on each side of the guide plate 2. The U-shaped protrusion 2C of the guide plate 2 is guided and mounted in the groove 12 provided in the guide bearing member 11. Reference numeral 6 denotes an operating shaft, which is rotatably supported at both ends and the center by a guide bearing member 11, and is made of a deformed wire whose cross section is approximately a semicircular arc over its entire length, and a driving gear 6 is attached to one end of the operating shaft. is the installation. Reference numeral 17 denotes an operating nozzle having a gear 13 that meshes with the gear 6, and is attached to a side plate (not shown) of the base plate 15 by a shaft pin 14. Although the gears 6 and 13 are convenient for setting the rotation angle of the operating shaft 6, they may be omitted and the operating handle 17 may be directly connected to the operating shaft 6.

Next, to explain the operation, in FIG. 4, the flat part A of the operating shaft is directed downward within the notch 1o of the spring plate 7, and the spring plate 7 is guided by the push-up pieces 9 at both ends by its elastic force. The state in which the plate 2 is being pushed up is shown. Therefore, the feed rollers 3 and 4 supported by the guide plate 2
is in pressure contact with. The pair of guide plates 2 are designed to move independently with respect to the platen 1 in this manner.

Next, as shown in FIG. 6, when the operating handle 17 is rotated in the direction of the arrow and the operating shaft 6 is rotated via the gears 6 and 13, the flat surface A of the operating shaft 6 becomes horizontal or upward. . The rotation angle of the operating shaft 5 is set to 90° because the arc portion of the operating shaft 6 contacts the bottom of the notch 10 of the spring plate 7 and the guide plate 2 is moved back by a predetermined amount. The rotation of the operating shaft 6 may cause the spring plate 7 to
The push-up pieces 9 at both ends are pushed down, and the pair of guide plates 2 pushed up by the push-up pieces 9 are lowered. Therefore, the feed rollers 3 and 4 supported by the guide plate 2 are separated from the platen 1, and the recording paper 23 can be inserted and ejected.

In the embodiment of the present invention described above, the platen 1 and the operating shaft 6
In other words, the moving direction of the feed rollers 3 and 4 exists on a straight line connecting the guide plate 2 toward and away from the guide plate 2 .

In the above embodiment, the feed rollers 3 and 4 were used, but this is replaced by the pack feed roller 3. There is no problem even if it is called the front feed roller 4.

As described above, according to this embodiment, the two guide plates 2 operate independently with respect to the platen 1, that is, the guide plates 2 each independently operate with respect to the platen 1. This is advantageous in that the pressing loads of the feed rollers 3 and 4 against the platen 1 are equalized.

That is, since the overall length of the guide plate 2 is shortened, it is easy to ensure accuracy over the entire length of the guide plate 2, and the feed roller 3
, 4, it becomes easier to ensure the facing position accuracy of the cut-and-raised parts 2d that support the guide plates 2, making it considerably easier to manufacture.Moreover, since the overall length is shortened, the problem of deflection of the guide plate 2 can be multiplied. It is.

In addition, since the operating shaft 6 has a semicircular cross-section over its entire axial length, there are no steps or the like, so when installing the operating shaft 6, insert it from one side of the guide bearing member 11. This simplifies assembly because all you have to do is .

In this embodiment, two guide plates 2 are arranged side by side, but three or more guide plates 2 may be arranged side by side.

Effects of the Invention 4 According to the present invention, the following effects can be obtained. In other words, the complicated paper feeding device can be simplified, and by dividing the guide plate, parts and assembly accuracy can be ensured, and instability such as paper skew and jamming can be avoided during paper feeding. Accordingly, it is possible to provide a paper feeding device that eliminates undesirable movement and ensures reliable paper feeding operation.

Furthermore, since the same number of spring plates as the number of guide plates are provided corresponding to the divided guide plates, it is relatively easy to keep the variation in the elastic force of each part of the spring plates small. The pressing forces of the feed rollers against the platen can also be maintained equally.

Furthermore, since the shape of the operating shaft is simplified, assembly of the paper feeding device, especially attachment of the operating shaft, becomes extremely easy.

The present invention can provide an excellent paper feeding device for a printing device that can achieve the above-mentioned effects.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional paper feeding device, Fig. 2 is an exploded perspective view of a paper feeding device proposed by the applicant, and Fig. 3 is an embodiment of the present invention. FIG. 4 is an exploded perspective view of the paper feeding device, FIG. 4 is a sectional view of the main part, FIG. 5 is a side view of the main part, and FIG. 1...Platen, 2'...Guide plate,
3, 4...Feed roller, 6...Operating shaft, 7...Spring plate, 9...Pushing piece, 1
0... Notch portion, 11... Guide bearing member, 16... Substrate, 17... Operating handle, 23... Recording paper. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure a″′J 2 mouth??＾ Figure 3

Claims (3)

[Claims] (1) A platen, a feed roller, an arc-shaped guide plate that supports the feed roller and guides the recording paper in the circumferential direction of the platen, and the guide plate that presses the feed roller against the platen. a spring plate interposed between the spring plate and the substrate; an operating shaft that acts on the spring plate to move the feed roller away from the platen against the elastic force of the spring plate; and a pivot supporting the operating shaft. and a guide bearing member attached to the base plate so as to guide and support the guide plate, and a plurality of the guide plates are arranged in an axial direction of the platen. (2) A paper feeding device for a printing device according to claim 1, wherein a spring plate is interposed between the guide plate and the substrate in correspondence with each of the plurality of guide plates. (3) A paper feeding device for a printing device according to claim 1, wherein the operating shaft is located in a notch provided in the push-up piece of the spring plate, and the cross section thereof is formed into a semicircular arc shape.