JPS59222372A - Paper feeder for printer - Google Patents

Abstract

PURPOSE:To obtain a paper feeder simple in construction, composed of a small number of component parts and capable of being reduced in size, by a method wherein a pair of pinch roller shafts are connected to each other by tension springs, and each pinch roller is pressed against a feed roller by the elastic force of the springs. CONSTITUTION:The pinch roller shafts 3A, 3B are connected to each other at two positions on both sides thereof by the springs 19. The shafts 3A, 3B are guided along slots 18A, 18B formed in side plates 16, 17 substantially in radial directions with respect to the axis of a roller shaft 1, and are energized in directions for approaching each other by the springs 19. Accordingly, each of the pinch rollers 4A, 4B fitted to the pinch roller shafts 3A, 3B is pressed against the surface of the feed roller 2 substantially in a direction normal to the surface by a component of force of the force of the springs 19.

Description

Detailed Description of the Invention Technical Field The present invention relates to a paper feeding device for a printer, and more particularly to a paper feeding device for various types of printers as input/output devices such as typewriters and computers. The present invention relates to an improvement in the structure of a paper feeding device in which a pair of pinch rollers are brought into pressure contact with each other before and after a feeding roller.

Various printers are used as input/output devices for typewriters, computers, or various office equipment, and these printers are provided with paper feeding devices.

This paper feeding device includes a feed roller that is rotatably supported by the printer body, and a pair of pinch roller shafts that are parallel to the feed roller before and after the feed roller, and are pressed against the surface of the feed roller through the recording paper. A type of paper feeding device equipped with a pinch roller is used.

Prior Art Fig. 1 is a diagram illustrating the main parts of a printer that is equipped with this glazed paper feeding device. Two feed rollers 2 are fixed, and a pair of pinch rollers +iqi+ 3A, 3B are provided before and after the feed roller 20, parallel to the feed roller 20 and capable of coming into contact with and separating from the feed roller 20. Vinci roller 4A made of rubber, glass, etc. is placed at the corresponding position.
, 4B are each rotatably mounted. The recording paper S is inserted between the feed 90-ra and the pinch roller and is rotated in the direction of the arrow by a predetermined pinch (usually one line at a time) due to the frictional force between the feed 90-ra and the pinch roller. sent in the direction.

During paper feeding), the pinch rollers 4A and 4B are pressed against the feed roller 2 via the recording paper S, rotate freely in accordance with the paper feed, and smoothly feed the recording paper S.

Recording paper S fed from the paper feeding device is passed through a printing mechanism consisting of a print head 5, a platen 6, etc., and characters such as numbers and letters, as well as images, etc. are printed in this printing mechanism. In the illustrated example, the print head 5
is attached to a carriage 8 whose position is controlled along a carriage guide bar 7 installed laterally. The platen 6 is provided at a position facing the recording paper S between them.
is attached to the platen holder 9. The lateral movement (reciprocation) of the carriage 8 can be performed by a separate mechanism, but in the illustrated example, a motor (not shown)
using an endless wire 10 that is attached to the output shaft of and reciprocated in the direction of arrow B by a pulley (not shown),
The carriage 8 is connected to this endless wire to control its lateral position.

As shown in FIG. 2, for example, the conventional paper feeding device rotatably supports a pair of pinch roller shafts 3A and 3B on a connecting plate 11 at appropriate locations (usually two locations on both the left and right sides). The center of this connecting plate 11 is rotatably supported by a pin 13 provided at the tip of a movable arm 12, and this EiJ movable arm 12 is attached to a support shaft 14 with respect to the printer body.
W movably supported, and the other end of the movable arm is urged downward in the figure by the spring force of the tin ring 15.''1・i
It had a structure. That is, the movable arm 1 is biased clockwise around the support shaft 14 by the springing force of the suge ring 15.
The connecting plate 11t is pivotally supported at the tip of the connecting plate 11, and the pinch roller shafts 3A and 3B are pivotally supported at both ends of the connecting plate 11, so that each pinch roller 4A+4B is connected to the feed roller 2.
It had an 'it' structure that brought it into pressure contact with the other.

However, in the paper feed device of such conventional printers,
It is necessary to provide link mechanisms such as the connecting plate 11 and the movable arm 12, as well as a large number of shaft supports, resulting in a complex structure, a large number of parts, and a large amount of space. It was a hindrance. In particular, although the printing mechanism of thermal transfer printers (thermal blink) can be made extremely compact, as mentioned above, the paper feeding device requires a large amount of space, making it difficult to achieve sufficient miniaturization of the printer. There was a problem.

Purpose The purpose of the present invention is to overcome the drawbacks of the prior art,
To provide a paper feeding device for a printer that has a simple structure, has a small number of parts, and can be downsized.

A feature of the present invention is that a pair of pinch roller shafts are connected to each other by a tensile system ring, and each pinch roller is pressed into contact with the feed roller by the elastic force of the tension ring, thereby achieving the above object.

That is, according to the present invention, there is a feed roller that is rotatably supported by the printer body, and a pair of pinch roller shafts that are attached to the front and back of the feed roller and parallel to the feed roller, and are pressed against the surface of the feed sheet through the recording paper. In a paper feeding device for a printer equipped with a pinch roller, both ends of each of the pinch roller shafts are inserted into a long guide hole formed in a substantially radial direction of the feed roller, and a gap between each pinch roller shaft is inserted. A paper feeding device for a printer is provided, which is characterized in that the pinch rollers are connected by a tensile system ring and each pinch roller is brought into pressure contact with the pinch rollers by the elastic force of the tension ring.

DESCRIPTION OF EMBODIMENTS FIGS. 3 and 4 are diagrams showing an embodiment of a paper feeding device for a printer according to the present invention, and the present invention will be specifically explained based on these drawings.

In FIGS. 3 and 4, a pair of pinch lobes 'l1il 3A, 3B that are self-corrected in front and behind the feed roller 20, which is rotationally driven in the direction of arrow A, and parallel to its axis, are
The guide holes 18A and 18B are inserted into guide holes 18A and 18B formed in both side plates 16 and 17 of the printer body.

The feed roller shaft 1 is rotatably supported by side plates 16 and 17. Each of the pinch roller shafts 3A.

The elongated holes 18A and 18B for guiding the feed roller 3B are formed approximately in the radial direction with respect to the axis of the feed roller 2 shaft 1, so that the pinch rollers 4A and 4B are in contact with the feed roller 2 from the normal direction thereof. It is designed to allow separation (contact and separation).

Each pinch roller shaft 3A, 3B has both of them (1iij2
They are connected to each other at certain positions by springs 19, and are biased toward each other by the elastic force (spring force) of each spring. In this way, for each pinch roller shaft 3,
3B into the elongated holes 18A-, 18B and biased toward each other by the fiil iQ snoring 19, each pinch roller 4A, 4B rowed in parallel with each pinch roller shaft is Due to this force, the feed roller 2 is pressed against the surface of the feed roller 2 from a substantially normal direction. That is, during paper feeding, the recording paper S is brought into pressure contact with the multi-feeding roller 2, and smooth paper feeding can be carried out as in the conventional paper feeding device shown in FIG. When taking out and inserting the recording paper S, the pinch rollers 4A and 4B are moved away from the feed roller 2 and the print head 5 is moved from the flatten 6 to the slider 11F.

In such a case, each pinch roller shaft 3A, 3B should be moved into each elongated hole 18A, 18B against the spring force of the tension 9 spring 19. Often, such operations can be carried out either manually or automatically, as appropriate.

In FIG. 4, the reference numeral 20 indicates a guide member for taking out and inserting paper, and parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals. ′-shi, detailed explanation thereof will be omitted.

According to the embodiment described above, the pinch roller shafts 3A, 3
B is inserted into the elongated holes 18A and 18B, and these are connected to each other by a spring 19, making it possible to obtain a pinch row 2 supporting ram 4 having the same static function as the conventional one. Compared to the conventional paper feeding device illustrated in FIG. 2, the structure is extremely simple, the number of parts is small, and a paper feeding mechanism that is most effective in downsizing and cost reduction can be obtained.

In the above embodiment, the paper feed roller 2 and the pinch roller 4. The case where one A, 4 B is provided on each side has been described, but three may be provided on both sides and in the middle, or other suitable arrangements may be made. Also, spring 1
Regarding 9, although all examples have been shown in which one is provided on both sides, it is also possible to arrange an appropriate number of these at appropriate locations other than those shown if necessary. Furthermore, this Sgeling 19
The spring is not limited to a so-called coil spring, and any spring that generates a spring force in the direction of drawing the pinch roller shafts together may be used, and other types of springs may also be used. It is.

Further, the paper feeding device 9 described above can be implemented in any type of printer including a tights writer, regardless of the type of print head, platen, etc.

Effects As is clear from the above explanation, according to the present invention, a paper feeding device can be obtained which has a simple structure, a small number of parts, and is effective in downsizing the printer and reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a perspective view illustrating the distribution unit of a printer equipped with a paper feed device suitable for applying the present invention, and Fig. 2 is a schematic side view of a paper feed Q device fZ”2 of a conventional printer. figure,
Fig. 3 shows a part of the paper feeding device of the printer according to the present invention, and Fig. 4 shows the main parts of the printer that implements the paper feeding device of Fig. 3. It is a schematic side 1m view of a part 111. 1...Feed roller shaft, 2...Feed roller, 3A, 3
B...Pinch roller shaft, 4A, 4B...Pinch roller, 5...Print head, 6...Platen, 8...
・Carriage, 16 , ' 17 , , Side plate (printer body), 18A, 18B... Long hole, 19... Sgelling, S... Recording paper, A... Rotation direction of feed roller, B... ...Print head feeding direction, F...Paper feeding direction of recording paper. 1st cause F Figure 4

Claims (1)

[Claims] (1)! ') A feed roller that is rotatably supported by the printer body, and a pinch roller that is attached to a pair of pinch row two shafts in front and behind the feed roller and parallel to the feed roller, and that is pressed against the surface of the feed roller through the recording paper. In the paper feed shield of the printer, both ends of the pinch roller shafts are inserted into guide holes formed in a substantially radial direction of the feed roller, and a tension spring is provided between the pinch roller shafts. A paper feeding device for a printer characterized in that the pinch rows 2 are connected and brought into pressure contact with each other by their elastic force.