JPH077175Y2 - Paper feed mechanism in printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a paper feeding mechanism of a printer, and more specifically,
With a simple mechanism, it is possible to control the position of the paper bail roller or the paper feed small roller at the time of inserting the recording paper or at the time of recording.

[Prior Art] First, a conventional example will be described below. 3 and 4 show a conventional example, FIG. 3 is a side view of a main part, and FIG. 4 is a top view of the main part. 1 in the figure
Is a platen around which the recording paper 2 is wound, and is rotationally driven by a motor (not shown). Reference numeral 3 is a first paper guide provided on the paper feed side for guiding the inserted recording paper 2 between the platen 1 and the recording head 4, and 5 is a small roller for nipping and conveying the recording paper 2 together with the platen 1. Further, 6 is a paper bail roller which presses the recording paper 2 against the platen 1 at the rear of the recording position to prevent the recording paper 2 from vibrating, flaking and the like. The paper bail roller 6 is rotatably supported by the shaft 6b. Reference numeral 7 is a second paper guide for guiding the recording paper 2 to the paper cutter 8. In the printer having such a structure, when the recording paper 2 is inserted, the paper bail roller 6 is rotated by a lever (not shown) to move the arm 6a to the third position.
The platen 1 is rotated in the direction of arrow A in the figure to be separated from the platen 1, and a gap is formed between the platen 1 and the platen 1. When the recording paper 2 is inserted along the first paper guide 3 and the platen 1 is rotated in the direction of arrow B by a motor (not shown), the recording paper 2 is held between the platen 1 and the small roller 5. Be transported. Thereafter, the small roller 5 is rotated from a lever or the like (not shown) to be separated from the platen 1 via the arm 5a.
In this state, the recording paper 2 is free, so after the manual alignment, the small roller 5 and the paper bail roller 6 are brought into pressure contact with the platen 1 again to complete the setting of the recording paper 2. By driving the recording head 4, the recording paper 2 on which recording has been performed is further guided to the paper cutter 8 by the second paper guide 7 and cut into an appropriate size. In the figure, reference numerals 8a and 8b denote a rotary blade and a fixed blade of the paper cutter 8, respectively, and the rotary blade 8a is rotated in the direction of arrow C in FIG. .

[Problems to be solved by the invention]

However, in the conventional printer as described above,
The contact of the paper bail roller 6 and the paper feed small roller 5 with the platen 1 must be controlled by using different levers, respectively, which complicates the mechanism.

In addition, Japanese Utility Model Laid-Open No. 59-79351 or Japanese Utility Model Laid-Open No. 59-112660.
Although a mechanism has been proposed in which a pair of pressure rollers are brought into contact with the platen by a single lever as described in Japanese Patent Publication No. JP-A-2003-242977, since a pair of pressure rollers move in conjunction with each other in this mechanism, The pair of pressure rollers can take only two states, that is, a state in which both of them are in contact with the platen and a state in which they are separated from the platen. Therefore, the movements of the two rollers can be independently controlled to correspond to various operations. There was also a problem that I could not do it.

The present invention has been made in view of such problems, and an object thereof is to automatically and reliably guide the recording paper with a simple mechanism.

[Means for solving problems]

In order to achieve such an object, the paper feeding mechanism of the present invention includes a platen around which recording paper is wound and rotatable, a paper bail roller which is positioned behind the recording position and is held in contact with and separated from the platen. A paper feed small roller located in front of a recording position, capable of coming into contact with and separating from the platen, and conveying the recording paper together with the platen, a first crank lever connected to the paper bail roller, and the first crank lever. Second crank lever which is provided independently of the crank lever and is connected to the paper feed small roller, and the first crank lever.
A paper feed mechanism including an interlocking cam with which the second crank lever engages with the second crank lever, and a release lever for rotating the interlocking cam, wherein the interlocking cam is operated by moving the release lever. Is rotated, and the first and second crank levers move independently of each other in response to the rotation of the interlocking cam, so that the paper bail roller and the paper feed roller move in accordance with the position of the release lever. A small roller and a first state in which both are in contact with the platen; a second state in which both are separated from the platen; a paper bail roller is separated from the platen and the paper feed small roller is the platen. And a third state of contacting with.

[Action]

In the above-mentioned means, when the release lever is moved, the interlocking cam rotates, and the first and second crank levers move independently of each other in response to the rotation of the interlocking cam. When the release lever is in the first position, the paper bail roller and the paper feed small roller are in the first state in which both of them are in contact with the platen, and the release lever is in the second position. Is in a second state in which both the paper bail roller and the paper feed small roller are separated from the platen, and when the release lever is in the third position, the paper bail roller is separated from the platen and the paper feed small roller is The third state is brought into contact with the platen.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the essential parts showing the construction of an embodiment of the present invention, and FIG. 2 is a top view of the same.

In the figure, 11 is a platen on which the recording paper 12 is wound and rotationally driven by a motor (not shown), and 13 is a platen for the recording paper 12.
First paper guide 15 for guiding between 11 and recording head 14,
Is a small roller that holds and conveys the recording paper 12 together with the platen 11, 17 is a second paper guide that guides the recording paper 12 to the paper cutter 18, and this paper guide 17 connects the paper bail roller 16 and the recording paper guide member 17a. It is integrally formed. 19 is an interlocking cam, 20 is a release lever that rotates this interlocking cam 19,
Reference numeral 21 is a crank lever that is driven by the rotation of the interlocking cam 19. Pin on one end of this crank lever 21
21a is erected, and the cam portion 1 formed on the upper surface of the interlocking cam 19
It is engaged with 9a. The other end 21b of the crank lever 21 is inserted into a shaft 26 having a substantially oval cross section. One end of a paper guide lever 22a is also inserted into the shaft 26, and the paper guide lever 22a has a second end.
Via the guide lever 22b of the second paper guide 17 is connected to the side end portion 17b of the second paper guide 17 on the side where the paper bail roller 16 is not provided. Also, a part of the interlocking cam 19 is cut out on the right side.
19b is formed, and a pin 20a erected on one end of the release lever 20 is fitted therein. The release lever 20 is supported by a side plate (not shown) by a pin 20b, and the other end of the release lever 20 is swingable in the vertical direction (arrows G, F) in FIG. 1 with the pin 20b as a fulcrum. The interlocking cam 19 is further formed with a cutout portion 19c, and holds a pin 23a erected on the small roller crank lever 23. The cutout portion 19c can move within the cutout portion 19c when the pin 23a rotates in one direction (arrow D direction) and rotates in the opposite direction (arrow E direction). The cutout end portion 19d is formed in such a size that the pin 23a can be rotated. When the release lever 20 is at the center position, as in the state shown in FIG. 1, the pin 23a is attached to the cutout portion 1 of the interlocking cam 19.
It is held in the 9c without abutting the end portions 19d and 19e. The other end of the small roller crank lever 23 is fitted on a shaft 27 having a substantially oval cross section. Further, a lever 24 connected to the small roller shaft 15a is fitted on the shaft 27, and the small roller crank lever 23 is rotated by the lever 24.
It is transmitted to the small roller 15 via 24. Reference numeral 25 is a substrate to which micro switches 25a and 25b are attached, and the position of the release lever 20 is detected by the on / off state of the micro switches 25a and 25b.

Next, a paper feeding operation using this mechanism will be described.
First, when the recording paper 2 is inserted, the release lever 20 is pushed down from the center position (state of FIG. 1) in the arrow F direction, so that the interlocking cam 19 rotates in the arrow D direction. Along with this, the pin 21a rides on the convex portion of the concave portion of the cam portion 19a, the shaft 26 rotates counterclockwise (direction of arrow H), and the paper guide levers 22a and 22b move leftward (direction of arrow E). ) To. Therefore, the paper guide 17 slides to the left (the direction of arrow J), and the paper bail roller 16 separates from the platen 11. At this time, the pin 23a only moves within the cutout portion 19c of the interlocking cam 19, and does not move in position.
Therefore, the small roller crank lever 23 is kept in the state shown in FIG. 1, and the small roller 15 is kept in pressure contact with the platen 11. Also, at this point, the micro switch 25b is turned on and a motor (not shown) is turned on, so that the platen 11 is moved clockwise (direction of arrow K) by this motor.
Then, the recording paper 12 is automatically conveyed by the platen 11 and the small rollers 15. However, if it is left as it is, the recording paper 12 may be skewed, so that it is necessary to perform sufficient alignment. At the time of this alignment, move the release lever 20 upward (arrow G in FIG. 1).
Direction). As a result, the interlocking cam 19 rotates in the clockwise direction (arrow E direction), so that the pin 21a moves toward the interlocking cam
It goes through the concave portion of the cam portion 19a of 9 and is again locked to the convex portion on the opposite side. Therefore, as described above, the paper guide 17 is kept in the state of being separated from the platen 11 again after coming into contact with the platen 11. Further, the pin 23a is lifted upward by the end portion 19d of the cutout portion 19c of the interlocking cam 19. Along with this, the shaft 27 rotates, and the small roller 15 is also separated from the platen 11 via the lever 24. In this state, the recording paper 12 is free and the position can be manually adjusted. After aligning the recording paper 12, return the release lever 20 to the state shown in FIG.
Is in the concave portion of the cam portion 19a of the interlocking cam 19, and the pin 23a is in the cutout portion 19a.
Since it is held inside c in a free state (state of FIG. 1), both the paper bail roller 16 and the small roller 15 of the paper guide 17 are in pressure contact with the platen 11 by the mechanism described above. For the pressure contact of the small roller 15, a downward force in the drawing may be applied to the small roller crank lever 23 by a spring (not shown) or the like. The state shown in FIG. 1 means that the release lever 20 causes the microswitch 25a.
Only the ON state is easily detected and the recordable state is set. The recorded recording paper 12 is guided by the paper cutter 18 along the paper guide 17 and cut into an appropriate size. Reference numerals 18a and 18b denote a rotary blade and a fixed blade, respectively.
Is disconnected.

〔effect〕

As described above, according to the present invention, since the control of the paper bail roller and the paper feed small roller can be controlled by the operation of one release lever, a complicated mechanism is not required, and the paper bail can be handled easily. Since the first crank lever connected to the roller and the second crank lever connected to the paper feed small roller are provided so as to be able to move independently of each other, the paper can be moved depending on the position of the release lever. A bail roller and a paper feed small roller in a first state in which both are in contact with the platen;
It is possible to control a second state in which both are separated from the platen and a third state in which the paper bail roller is separated from the platen and the paper feed small roller is in contact with the platen, and as a result, the recording is performed. It is possible to easily and surely perform the operations of aligning the recording paper and inserting the recording paper.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a side view of an essential part thereof, and FIG. 2 is a top view of the essential part thereof. FIGS. 3 and 4 show a conventional example, FIG. 3 is a side view of an essential part thereof, and FIG. 4 is a top view of the essential part thereof. 11 …… Platen, 12 …… Recording paper 14 …… Recording head, 15 …… Small roller 16 …… Paper bail roller 17 …… Paper guide, 18 …… Paper cutter 19 …… Interlocking cam, 20 …… Release lever

Claims (1)

[Scope of utility model registration request] 1. A platen around which recording paper is wound and rotatable,
A paper bail roller located behind the recording position and held in contact with and separated from the platen; and a paper bail roller located in front of the recording position, which is contactable with and separated from the platen, and conveys the recording paper together with the platen. Paper feeding small roller, a first crank lever connected to the paper bail roller, and a second crank lever independent of the first crank lever and connected to the paper feeding small roller. A paper feed mechanism including a crank lever, a interlocking cam with which the first crank lever and the second crank lever engage with each other, and a release lever that rotates the interlocking cam. Is moved to rotate the interlocking cam, and the first and second crank levers move independently of each other in response to the rotation of the interlocking cam to release the release cam. Depending on the position of the lever, the paper bail roller and the paper feed small roller are in a first state in which both are in contact with the platen, a second state in which they are both separated from the platen, and the paper bail. A paper feed mechanism in a printer, wherein the roller is configured to be in a third state in which the roller is separated from the platen and the paper feed small roller is in contact with the platen.