JPS6313024Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper feeding mechanism in a recording device such as a pen-type recording device, a graphic printer, or an alphanumeric printer. The present invention relates to a paper feeding mechanism in a recording device, which allows the paper to be carried out easily and has fewer obstructions to the field of view of a writing section for recorded items.

Conventionally, a paper feeding mechanism as shown in FIG. 1 (perspective view) has been frequently used in various recording apparatuses. That is, a roller shaft 2 parallel to the rotation axis 1a of the rubber roller 1 is provided on the surface of a rubber roller (paper feed roller) 1 that is rotationally driven by a motor (not shown).
Pressure rollers 3a, 3b, which are rotatably attached to the roller shaft 2, are brought into contact with the rubber roller 1, and the pressure rollers 3a, 3b are moved against the rubber roller 1 by the force of springs 4a, 4b provided at both ends of the roller shaft 2.
are being oppressed. Further, above this roller shaft 2, a roller shaft 5 which is also parallel to the rotation shaft 1a is disposed, and press rollers 6a and 6b, which are rotatably attached to this roller shaft 2, are attached to the surface of the rubber roller 1. It makes light contact.

Then, the recording paper P is held between the rubber roller 1 and the pressure rollers 3a, 3b, and the recording paper P is held by the frictional force between the rubber roller 1 and the recording paper P generated by the force of the springs 4a, 4b. It gives the power to feed. Further, the upper part of the recording paper P is lightly pressed down by presser rollers 6a and 6b, whereby the recording paper P is wrapped around the circumference of the rubber roller 1, and this wrapped portion, that is, the two roller shafts 2 and 5, is Recorded items are written in between.

However, in the above-mentioned conventional paper feeding mechanism, since the roller shaft 5 and the presser rollers 6a and 6b are located above the recording area, when the recording paper P is fed upward for line feed after writing, the written characters and symbols is the roller shaft 5 and the presser rollers 6a, 6
There is a drawback that recorded matters cannot be confirmed because they are blocked by Further, since the characters immediately after being written touch the presser rollers 6a and 6b, the surface of the recording paper P may become dirty. Furthermore, since the force for feeding the recording paper P is substantially generated only by the pressure contact force of the two pressure rollers 3a and 3b, there is also the disadvantage that paper feeding becomes unstable.

The purpose of this invention is to eliminate such drawbacks of conventional paper feeding mechanisms, and to make it possible to confirm written record items and to ensure reliable conveyance of recording paper. It is.

In order to achieve the above-mentioned purpose, the present invention provides two pressure rollers at each end of the rubber roller (paper feed roller) in the axial direction with the printing area in between, and the upper pressure roller is placed outside the printing area. The four edges of the recording paper are sandwiched between these pressure rollers and the rubber roller, and the upper pressure roller is sandwiched between the two pressure rollers, upper and lower, arranged on both edges of the rubber roller. A guide plate is provided that is approximately the same length as the leading edge and guides both edges of the recording paper.

Embodiments of the present invention will be described below with reference to FIG. 2 and the following drawings.

FIG. 2 is a perspective view of the pen type recording device, FIG. 3 is a plan view, FIG. 4 is a right side view, and FIG. 5 is a left side view. As shown in FIG. 2, this pen type recording device holds recording paper P between a rubber roller (paper feed roller) 11 and pressure rollers 12, 12a and carries it out in the X direction, and also moves a pen 13 in the Y direction. Characters, symbols, charts, etc. are written on the recording paper P by moving both of them forward and backward in the X and Y directions.

First, the configuration and operation for moving the pen 13 in the Y direction will be described. The pen 13
A short refill for an oil-based or water-based ballpoint pen is used, and this pen 13 is held in a synthetic resin carriage 14. As shown in FIG. 7 (perspective view) and FIG. 8 (longitudinal sectional view), the pen 13 is attached to the upper part of the carriage 14 so as to be able to freely slide in the direction of contacting and separating from the rubber roller 11. Further, a leaf spring 15 fixed to the carriage 14 is engaged with the tip of the pen 13, and the pen 13 is urged in a direction away from the rubber roller 11.
On the other hand, a groove 14 formed at the rear of the carriage 14
A hammer 16 also made of synthetic resin is interposed in a, and a protrusion 16a integrally formed at the lower end of the hammer 16 abuts the rear end of the pen 13. This hammer 16 has an oval hole 16b (FIG. 8) bored therein, and a hammer shaft 17 having an oval cross section is inserted into this oval hole 16b. The hammer shaft 17 is inserted into a round hole 14b (FIG. 7) formed in the carriage 14, and both ends of the hammer shaft 17 are connected to side frames 18a, 18b (FIG. 2, FIG. 7) of the recording device. (Fig. 3) is rotatably supported. A cylindrical holder 19 is fitted to one end of the hammer shaft 17 on the outside of the side plate 18b, and a projecting body 19a integrally formed with this holder 19 is attached to the side surface of the side plate 18b. The operating plate 21 of the solenoid 20 is connected to the operating plate 21 of the solenoid 20 . Note that 22 is a return spring for the operation plate 21.

On the other hand, a round shaft 2 is provided at the front lower part of the carriage 14 between the both side plates 18a and 18b.
3 is slidably inserted (Fig. 3, Fig. 7).
figure).

Further, as shown in FIG.
4 has holes 14c penetrating through both sides,
A wire 24 is inserted into this hole 14c,
Wire 24 is secured to carriage 14 by screw 24a (FIG. 7). As shown in FIG. 6 (schematic system diagram), one end of this wire 24 is hung around a pulley 25 which is rotatably and inclinedly provided on the outside of the side plate 18b. The other side of the wire 24 is hung around a pulley 26 that is rotatably and horizontally provided on the outside of the side plate 18a, and is further wound around a winding pulley 27 that is rotatably installed on the outside of the side plate 18a. There is. Furthermore, the wire 2 wound around this winding pulley 27
4 is hung on a pulley 28 which is rotatably and vertically installed on the outside of the side plate 18a.
The wire 24 returns inside the pulley 25 and is connected to the other end of the wire 24 via a tension retaining spring 29. In addition, the winding pulley 27
A driven gear 27a is integrally formed in the
This driven gear 27a meshes with an intermediate small gear 30 implanted in the side plate 18a (see FIGS. 3 and 5). Further, a large intermediate gear 30a provided integrally with the small intermediate gear 30 meshes with a pinion gear 32 provided on the rotating shaft of the stepping motor 31. Furthermore, this stepping motor 3
1 is fixedly installed inside the side plate 18a.

The driving force of the stepping motor 31 is transmitted from the pinion gear 32 to the intermediate large gear 30a, and the intermediate small gear 30, which rotates together with the intermediate large gear 30a, drives the driven gear 27a. The winding pulley 27 rotates.
As a result, the wire 24 forming a closed loop is driven, and the carriage 14 connected to the wire 24 is guided by the hammer shaft 17 and the round shaft 23 and slides in the Y direction (FIGS. 6 and 7).

In addition, during the sliding process of the carriage 14 in the Y direction, when the solenoid 20 is in a non-energized state, the holder 19 and the hammer shaft 17 are rotated in the _O1 direction (FIG. 7) by the spring 22. The hammer 16 is rotated and biased together with the rotating shaft 17 in the _O1 direction, and the projecting body 16a (FIG. 8) of the hammer 16 is moving away from the rear end of the pen 13. Therefore, in this state, the pen 13 is biased away from the rubber roller 11 by the force of the leaf spring 15, and the pen tip separates from the recording paper P and does not write. Furthermore, when the solenoid 20 is energized from this state, the holder 19 and the hammer shaft 17 rotate in the _O2 direction (FIG. 7), and the protrusion 16a of the hammer 16, which rotates together with the holder 19, rotates in the pen 13. This force pushes the pen tip toward the rubber roller 11. Therefore, in this state, pen 1
3 allows writing on the recording paper P. Then, in this state, necessary characters, symbols, charts, etc. are written by driving the carriage 14 and/or the recording paper P as appropriate based on the information writing command.

Next, the configuration of the paper feeding mechanism will be explained.

The rubber roller 11 is made of NBR rubber fixed to the rotating shaft 11a, and has a diameter of about 10 mm.
It has a size of about mm. Also,
As shown in FIG. 3, both end portions of this rotating shaft 11a are rotatably supported by the side plates 18a and 18b, and one end of this rotating shaft 11a is supported by the side plates 18b and 18b.
protrudes outward, and a driven gear 41 is fixedly installed at its tip. This driven gear 41 is meshed with a rotatable intermediate small gear 42 installed on the outside of the side plate 18b (see FIGS. 3 and 4).
Further, this intermediate small gear 42 includes an intermediate large gear 42a.
The intermediate large gear 42a meshes with a pinion gear 44 attached to the rotating shaft of the stepping motor 43. The stepping motor 43 is fixed coaxially with the stepping motor 31 on the back side of the side plate 18b. Further, as shown in FIG. 10, a guide plate 45 is provided below each stepping motor 31, 43.
A and 45b are provided in duplicate, and their tips extend to the bottom of the rubber roller 11. The recording paper P passes between the guide plates 45a and 45b and is fed to the rubber roller 11.

On the other hand, as shown in FIG. 9 (exploded perspective view), the pressure rollers that press against the surface of the rubber roller 11 are provided in upper and lower stages at both ends of the rubber roller 11, and the upper pressure roller 12 has an outer diameter of about 3.5 mm. mm, the lower pressure roller 12a has an outer diameter of approximately 2.5 mm,
Both are made of brass rings. The upper pressure roller 12 is the rubber roller 1.
The lower pressing roller 12a is also supported by short roller shafts 51a separately provided at both ends of the lower pressure roller 12a. There is. Moreover, the inner diameter of each pressure roller 12, 12a is the roller shaft 51, 5.
It is designed to have a slightly larger dimension than the outer diameter of the heads 51' and 51a' of 1a. The pressure rollers 12, 12a pass through the heads 51', 51a' and are fitted onto the roller shafts 51, 51a.
12a is rotatably supported. Further, the pressure rollers 12 and 12a are the rubber rollers 1
1, the roller shafts 51, 5 of the pressure rollers 12, 12a are pressed by this pressure force.
1a is prevented from coming off from the narrow diameter portion. As shown in FIG. 11, the upper pressure roller 12 and the roller shaft 51 are set to have shorter dimensions than the lower pressure roller 12a and the roller 51a.
The contact area between the lower pressure roller 12a and the rubber roller 11 is smaller than the contact area between the lower pressure roller 12a and the rubber roller 11. Further, the roller shaft 51,
51a are implanted in holding plates 52a and 52b arranged on both sides of the rubber roller 11, respectively. Guide plates 53a and 53b are attached to the holding plates 52a and 52b, respectively. The guide plates 53a and 53b cover the space between the two pressure rollers 12 and 12a, as shown in FIG.
3a and 53b have an arcuate cross section so as to form a certain gap with the surface of the rubber roller 11. Furthermore, the width of the guide plates 53a and 53b is
The tip of the upper short pressure roller 12 and the holding plate 52
The dimension is set to be approximately the same as the distance (dimension W shown in FIG. 11) between the inner surfaces of a and 52b. Further, as shown in FIG. 9, each of the holding plates 52a and 52b has rectangular notches 54a and 54b formed in the center thereof, respectively. The notch 54a of one holding plate 52a is the notch 55 of the side plate 18a.
The engagement body 56a is fitted into the neck portion of the engagement body 56a, which is bent and formed in the shape of a shape (FIG. 5). In addition, the other holding plate 52b
The notch 54b is the notch 55 of the other side plate 18b.
It is fitted onto a neck portion 56d of an engaging body 56c which is bent and formed into a shape shown in FIG. As a result, the holding plates 52a, 52b are held by the side plates 18a, 18b, and can be slightly moved in the direction toward and away from the rubber roller 11 (in the direction of the arrow in FIG. 9). Further, a spring 57a is connected to the rear end of the holding plate 52a, and the rear end of the spring 57a is connected to the rear bent portion 18c of the side plate 18a.
(Fig. 5). A spring 57b is also connected to the rear end of the other holding plate 52b, and the rear end of this spring 57b is connected to the side plate 18.
b is fixed to the rear bent portion 18d (Fig. 4). The pressure rollers 12, 12a attached to the holding plates 52a, 52b are moved by the tension of the springs 57a, 57b to the rubber roller 11.
is compressed by a constant force on both edges. In addition,
As shown in FIG. 10, the pen tip of the pen 13 is directed toward the middle of the two pressure rollers 12, 12a.

Next, the operation of the paper feeding mechanism configured as described above will be explained.

The rubber roller 11 is rotated by a stepping motor 43 driven in forward and reverse directions. That is, as shown in FIGS. 3 and 4, the driving force of the stepping motor 43 is transmitted from the pinion gear 44 to the intermediate large gear 42a, and then to the driven gear 41 via the intermediate small gear 42 that rotates together with the pinion gear 44. Conveyed. The rubber roller 11 is rotated together with the rotation of the driven gear 41.

On the other hand, when loading the recording paper P, the leading edge of the paper is inserted from the rear between the guide plates 45a and 45b and sent to the bottom of the rubber roller 11. The leading edge of the recording paper P is first held between the rotating rubber roller 11 and the lower pressure roller 12a, and
Further, the recording paper P is held between the rubber roller 11 and the upper pressure roller 12, and is fed upward while being held between the pressure rollers 12 and 12a. At this time, the rubber roller 11 and the lower pressure roller 12a
Both edges of the leading edge of the recording paper P, which is held between the rollers and fed upward, are guided by the inner surfaces of the guide plates 53a and 53b, and guided to the lower side of the upper pressure roller 12. Therefore, both leading edge portions of the recording paper P are securely held between the rubber roller 11 and the upper pressure roller 12. Furthermore, since the guide plates 53a, 53b and the upper pressure roller 12 have the same length (W in FIG. 11), the guide plates 53a and 53b have the same length (W in FIG.
Even if the center part of the recording paper P, that is, the part not guided by the guide plates 53a and 53b, curves up while the leading edge of the recording paper P passes under the guide plates 3a and 53b, , the leading edge of the paper in this raised area is on the upper side of the pressure roller 1
2, and the leading edge of the recording paper P does not get jammed.

Then, the pen tip of the pen 13 comes into contact with and separates from the recording paper P wound around the surface of the rubber roller 11 by the upper and lower pressure rollers 12, 12a, and the stepping motors 31, 43 Characters, symbols, charts, etc. are written on the recording paper P by appropriately controlling the forward and reverse operations in combination.

As described above, according to the present invention, the pressure roller 1
Two pressure rollers 2, 12a are provided at both ends of the rubber roller (paper feed roller) 11.
Since both ends of the recording paper P are held between the rubber roller 11 and the recording paper P, there are no roller shafts or presser rollers in the writing area on the recording paper P, and a sufficient visibility can be ensured to ensure that the recorded content can be seen clearly. You will be able to confirm. In addition, the written characters and symbols do not come into contact with the presser roller, unlike in the conventional case, so the paper surface does not get dirty. Furthermore, since guide plates 53a and 53b are provided between the two pressure rollers, when loading recording paper, both edges of the leading edge of the paper are guided by these guide plates 53a and 53b, ensuring that the upper The paper can be held between the pressure rollers 12 of the paper, eliminating errors in loading the paper. Therefore, even if the upper pressure roller 12 is made shorter than the lower pressure roller 12a, the leading edge of the recording paper can be fed out without mistakes due to the action of the guide plates 53a and 53b. Therefore, this upper pressure roller 12
It is also possible to shorten the length and secure the maximum visibility of the recorded matter writing section.

[Brief explanation of drawings]

Figure 1 is a perspective view showing a conventional paper feeding mechanism;
The figures below show examples of the present invention, and the second
The figure is a perspective view of the pen tip recording device, FIG. 3 is a plan view thereof, FIG. 4 is a right side view thereof, FIG. 5 is a left side view thereof, and FIG. 6 is a schematic system diagram showing a carriage moving mechanism. Fig. 7 is a perspective view of the carriage, Fig. 8 is a vertical sectional view of the carriage, Fig. 9 is an exploded perspective view of the paper feed mechanism, Fig. 10 is a side view of the paper feed mechanism, and Fig. 11 is an illustration of the guide plate. It is an enlarged view. 11...Rubber roller (paper feed roller), 12...
...Upper pressure roller, 13...Pen, 14...Carriage, 12a...Lower pressure roller, 31...
...Stepping motor, 51, 51a...Roller shaft, 53a, 53b...Guide plate, 57a, 57
b... Spring, P... Recording paper.

Claims (1)

[Scope of utility model registration request] At both ends of a paper feed roller that is rotationally driven by a motor, two short roller shafts parallel to the rotation axis of the paper feed roller are arranged above and below, with the printing section in between. A pressure roller with a small diameter is rotatable and the upper side is mounted outside the printable area, and at both ends of the paper feed roller there is a pressure roller that covers between the two pressure rollers and extends to the tip of the upper pressure roller. A guide plate having a similar length and a gap between it and the paper feed roller is disposed, and the roller shaft is further urged in the direction of the paper feed roller by a spring so that the pressure roller is pressed against the paper feed roller. The recording paper is in pressure contact with both edges of the feed roller, and the recording paper is conveyed by rotationally driving the paper feed roller while holding both edges of the recording paper between the paper feed roller and the pressure roller. A paper feed mechanism in a recording device.