JPS59224376A - Paper feeder for printer - Google Patents

Abstract

PURPOSE:To enable to widen the range of use, by a method wherein slidable blocks are provided at both ends of a recording paper, and are provided with a tractor function and a mechanism for feeding by an ordinary driving roller, in a printer wherein various kinds of papers are used. CONSTITUTION:When the paper is a continuous paper provided with feeding holes, the slidable blocks 30a, 30b are moved along a driving shaft 27 and a guide shaft 28 so that pins 31a of belts 31 are engaged into the feeding holes of the paper, and the blocks are fixed at those positions. After setting the paper, a press member 35 is fitted, both end parts of the paper is pressed at parts C, and the right end of a lever 37 is depressed downward so that a pinch roller does not act on the continuous paper. On the other hand, when rolled paper or a slip paper is used, the slidable blocks 30a, 30b are so set that both end edge parts of the paper are located B on the driving rollers 33, the pinch rollers 38 are pressed against the driving rollers 39 by spring forces while not locking the levers 37, and the paper is fed by rotating the driving shaft 27.

Description

DETAILED DESCRIPTION OF THE INVENTION The unissued IJJ relates to printers, and particularly to a paper feeding device that can use a wide variety of recording papers and can reliably transport all the recording papers.

Various types of recording paper are used in printers such as wire dot printers.

FIG. 1 shows continuous paper Sa called fanfold paper. This IJL follow-up paper Sa has perforations p called perforations on both sides thereof at predetermined intervals. Further, FIG. 2 shows the roll paper Sb. This roll paper sb does not have the above-mentioned feed hole p.

Further, FIG. 3 shows a conventional printer using roll paper sb. In this printer, roll paper sb is inserted from the rear of the base l and wound around the cylindrical platen 2 from below. Then, the roll paper sb is pressed against the platen 2 by a roller 5 provided on the paper press shaft 4.

A shaft 3 of the platen 2 is rotationally driven by a stepping motor (not shown), and the roll paper held between the platen 2 and the roller 5 is sent out in the vertical direction as the platen 2 rotates. Further, a carriage 7 is mounted on a carriage guide shaft 6 provided parallel to the platen 2.
is provided in a slidable manner, and a printing member 8 such as a wired head or a thermal head is mounted above it. This printing member 8 faces the roll paper sb wound around the platen 2. Further, power from a stepping motor (not shown) is transmitted to the carriage 7 via a wire or the like, and the printing member 8 moves along with the carriage 7 in a direction along the platen 2, so that a predetermined printing operation is performed. There is.

However, in the printer shown in Fig. 3, the platen 2
Since the feeding force is applied to the paper by the pinching pressure between the paper feeder and the pinch roller 5, there is a drawback that the reliability of the paper feeding operation is somewhat lacking. That is, due to errors in the diameter of the platen 2 or slippage between the paper and the platen 2, a slight deviation may occur in the paper feeding pitch. Therefore, when ruled lines are drawn on paper and each line is printed along these ruled lines, there may be a discrepancy between the line feed pitch and the interval between the ruled lines due to the rotation of the platen 2. cause inconvenience.

On the other hand, the continuous paper Sa shown in Fig. 1 is suitable for use when printing on ruled lines as described above;
When using a, use a special model with a paper feeding pin on the platen 2, or use the model shown in Fig. 4, which is the model shown in Fig. 3 with a tractor mechanism added. There is a need.

In FIG. 4, the symbol 1O indicates this tractor mechanism. This tractor mechanism 1O is additionally installed on the second side of the platen 2 and slightly rearward. A pair of shafts 12 and 13 are provided in parallel between frames lla and llb on both sides of the tractor mechanism 10.

One shaft 13 is rotationally driven by a stepping motor (not shown).

Blocks 14a and 1 are provided at both ends of the circular shafts 12 and 13.
4b are arranged at predetermined intervals. A belt 15 is wound around both blocks 14a and 14b. This belt 15 is formed of an elastic member such as rubber or silicone, and has a plurality of pins 15a on its circumferential surface.
are formed regularly. The arrangement pitch of the pins 15a matches the pitch of the feed holes p formed in the continuous paper Sa. The rotation of the shaft 13 by the stepping motor is transmitted to the bell) 15, and the belt 15 rotates between the blocks 14a and 1.
It rotates at a predetermined rotational speed on the circumferential surface of 4b.

The continuous paper Sa is fed from the rear of the base l to the F side of the platen 2 and wound around the front surface of the platen 2. and,
The feed hole p of the continuous paper Sa is fitted into the pin 15a of the bell [5]. Then, the paper presser plate 16 is
The continuous paper Sa is traded on blocks 14a and 14
(The same paper press plate 18 is also available on the right side of Figure 4, but it is omitted in the figure.)
. Note that at this time, the paper presser shaft 4 is pulled forward of the base 1 to raise the roller 5 from the platen 2. During the printing operation, the carriage 7 is moved left and right and the printing member 8
When predetermined characters are recorded on the continuous paper Sa, and when printing lines are to be fed, the shaft 13 is driven by a stepping motor and the belt 15 is rotated. This pin 15a on the bell) 15 allows the continuous paper Sa to be sent out accurately.

In each of the above conventional examples, first, the printer shown in Fig. 3 can only use roll paper or cut paper, and cannot use the continuous paper Sa shown in Fig. 2; If paper Sa is used, a new tractor mechanism must be added as shown in FIG. Therefore, the configuration of the equipment becomes complicated, and the work of attaching and detaching the tractor mechanism is complicated. Moreover, in a printer equipped with a tractor mechanism from the beginning, roll paper sb or cut paper cannot be used.

The present invention has been developed by focusing on the above-mentioned conventional problems, and although it has an hour wheel structure, it can use all types of paper such as roll paper, cut paper, and continuous paper, and moreover, it is It is an object of the present invention to provide a paper feeding device for a printer in which the interval between paper feeding function parts can be freely changed according to the size.

The paper feeding device for a printer according to the present invention is provided with a pair of slide blocks whose spacing can be changed in the direction along the platen, and on which a tractor rotating body having pins around the periphery and a drive roller are mounted. The tractor rotating body and the drive roller are rotated by a drive shaft, and a pressing member facing the tractor rotating body and a pinch roller in contact with the drive roller are provided.

Next, embodiments of the present invention will be described with reference to the drawings from FIG. 5 onwards.

FIG. 5 is a perspective view showing a printer according to the present invention, and FIG. 6 is a schematic side view showing a paper feeding device thereof.

Reference numeral 21a in the figure is the left side plate of the base, and 21b is the right side plate. A platen 22 made of hard rubber or the like is provided between the side plates 21a and 21b.

The upper surface 22a of this platen 22 has a planar shape, and is adapted to receive the recording paper Sa or sb. A pair of carriage guide shafts 23 and 24 are provided in parallel between the side plates 21a and 21b, and the upper carriage 2
5 is movably provided. A stepping motor (not shown) is connected to this carriage 25 via a wire or the like.
The power is transmitted to the platen 22.
It is designed to move along the Further, the carriage 25 holds a printing member 26 such as a wire dot head or a thermal head. As shown in FIG. 6, the printing portion of the printing member 26 faces downward, and the platen 22
It faces the upper surface 22a of.

Further, a drive shaft 27 and a guide shaft 28 are provided in parallel between the side plates 21a and 21b. The guide shaft 28 is fixedly supported by both side plates 21a and 21b, and the drive shaft 27 is rotatably supported between both side plates 21a and 21b, and is rotationally driven by a stepping motor (not shown). It has become. A pair of slide blocks 30a and 30b are provided on the drive shaft 27 and the guide shaft 28. Both slide blocks 30a and 30
b slides on both shafts 27 and 28, and the distance between both slide blocks 30a and 30b can be changed to a predetermined value. Further, a fixing mechanism is provided between each slide block 30a, 30b and the guide shaft 28, so that both slide blocks 30a, 30b can be fixed once the interval between the slide blocks 3a, 30b is set. It has become.

Both slide blocks 30a and 30b have an elliptical cross section, and a belt 31 formed of an elastic material is wound around the circumferential surface thereof as an example of a track rotating body. A drive pulley (not shown) that rotates together with the drive shaft 27 and a driven pulley (indicated by reference numeral 40 in FIG. 6) that rotates around the kite shaft 28 are installed inside both slide blocks 30a and 30b. The belt 31 is wound around the driving pulley and the driven pulley 40. The bell) 31 rotates around the circumferential surface of the block based on the rotation of the drive shaft 27. A plurality of pins 31a are regularly arranged and formed on the outer peripheral surface of this bell I.31. The arrangement pitch of the pins 31d is formed to be the same as the pitch of the feed 6P of the continuous paper Sa shown in FIG. Furthermore, L-shaped arms 32a and 32b are integrally formed on opposing surfaces of both slide blocks 30a and 30b, respectively. Then, the block body and both arms 32a, 32b
A drive roller 33 is interposed between the two. This drive roller 33 is connected to the drive shaft 27 together with the drive bobber of the bell) 31.
It is designed to be rotationally driven by.

As shown in FIG. 6, the outer diameter of the drive roller 33 and the rotational diameter of the belt 31 are approximately the same. Note that the drive pulley around which the belt 31 is wound and the drive roller 33 are spline engaged with the drive shaft 27, and move on the shaft 27 as the slide prongs 30a and 30b move. It is supposed to be done. Similarly, the driven pulley 40 around which the bell 31 is wound also moves on the shaft 28 as the slide blocks 30a, 30b move.

Further, a pressing member 35 is provided on both the left and right slide blocks 30a and 30b. Although FIG. 5 shows the presser member 35 only on the left side, a rotating member is also provided on the right side. This pressing member 35 is attached to the slide block 3
0a, 30b can be easily fixed. The holding member 35 is attached to the slide blocks 30a, 3
When fixed on the bottle 31a, it faces the side of the bottle 31a (position indicated by C in FIG. 5) with a small gap. Further, a pin 36 is fixed to the side of the presser member 35, and a lever 37 is rotatably supported by the pin 36.
A pinch roller 38 is rotatably provided at the tip of the lever 37.

The lever 37 is always rotated counterclockwise in FIG. 6 by a spring. 5 has been done. Further, the pinch roller 38 is located on the -L side of the drive roller 33, and the pinch convex roller 38 is pressed against the drive roller 33 by the force of the spring biasing the lever 37. Further, in FIG. 6, when the right end of the lever 37 is pushed down in the C direction, the lever 37 rotates and the pinch roller 38 is separated from the drive roller 33, so that the lever 37 can be locked at that position.

Next, the operation of the printer with the above configuration will be explained.

The recording paper is loaded onto the platen 22 and both slide blocks 30a and 30b with the presser member 35 removed. If the paper is continuous paper (fanfold paper) Sa having perforations p as shown in Figure 1, both ends of the paper in the width direction are indicated by the five-dot chain line A in Figure 5. set in position. Then, the pin 31a formed on the belt 31 is fitted into the feed hole p.

If the distance between both slide blocks 30a, 30b does not match the width of the paper, slide blocks 30a, 30b
is moved along the drive 1 Fib 27 and the guide shaft 28,
Fix it in the optimal position. After setting the paper, a presser member 35 is attached to the slide blocks 30a, 30b J-, and this presser member presses both edges of the paper at the 0th copy to prevent the feed hole p from coming off the pin 31a. Note that after the presser member 35 is moved, the right end of the lever 37 in the drawing is lowered to raise the pinch roller 38, and the lever 37 is locked in that position so that the pressure by the pinch roller 38 does not act on the continuous paper Sa. put.

During a printing operation, the carriage 25 is driven by a stamping motor and moved along carriage guide shafts 23,24. During this moving operation, a printing member is operated on the continuous paper Sa placed on the upper surface 22a of the platen 22 to draw predetermined characters or the like. After one line of printing is completed, the drive shaft 27 is driven by the stepping motor, and the belt 3! is rotated, and the continuous paper Sa is sent out by the pin 31a.

Then, after one line of printing is completed, the next line is printed.

Next, when using roll paper sb or cut paper shown in FIG. 2, both edges of these papers are at the position of broken line B in FIG.
Both slide blocks 30a, 3 are located on the 3F.
Set the facing interval of 0b. At this time, both edges of the roll paper sb or cut paper are attached to the pin 31a of the bell 1-31.
Adjust the position so that it does not hit you. In the case of these types of paper, the lever 37 is not locked and the pinch roller 38 is pressed against the drive roller 33 by the force of the spring, and the pinch roller 38 is pressed against the drive roller 33 by the force of the spring.
8 and the drive roller 33 pinch both side edges of the paper. When feeding paper, the drive shaft 27
Rotate. As a result, the drive roller 33 rotates,
Paper is fed out. Note that the printing operation is the same as in the above case.

In the illustrated embodiment, the pin 31a is used as the tractor rotating body.
Although the belt 31 is shown, a roller having pins around the periphery may be used as another example of the tractor rotating body.

As described above, according to the present invention, the following effects can be achieved.

(1) Slide blocks are provided on both sides of the recording paper, and these slide blocks are equipped with a tractor function and a feeding mechanism using a normal drive roller. It is now possible to use both rolled paper and cut paper, and it is also possible to perform printing operations while transporting various types of paper under the same conditions, expanding the range of use of the printer.

(2) Since the tractor rotating body and the drive roller are driven by one drive shaft, the structure of the drive system is simple.

(3) Since the opposing distance between the pair of slide blocks can be changed, the paper feed section can be set freely to match the width of continuous paper or roll paper.

[Brief explanation of drawings]

Figure 1 is a perspective view of continuous paper, Figure 2 is a perspective view of roll paper,
3 and 4 are perspective views of a conventional printer, FIG. 5 is a perspective view of a printer according to the present invention, and FIG. 6 is a side view showing the paper feeding device thereof.

Claims (1)

[Claims] The platen and the printing member facing this platen are 4i11
In this printer, there is provided a pair of slide blocks whose opposing distance can be changed according to the widthwise dimension of the recording sheet placed on the platen, and each slide block has a slide block with a predetermined distance around the periphery. 11. A tractor rotating body having a pin and a drive roller are provided on the same axis, and a drive shaft is provided for driving both the tractor rotating body and the drive roller.11. A paper feeding device for a printer, characterized in that a paper pressing member facing a tractor rotating body and a pinch roller contacting a drive roller are sunk in a slide groove.