JPS5898277A - Paper feeder of printer - Google Patents

Abstract

PURPOSE:To avoid the rising of a continuous paper from the printing face of a platen during printing period by a method in which a pressure roller is provided in parallel in a pivotally movable manner with a tractor and a drive roller is rotatably provided in a printer to make printing on both of a continuous paper and single slip. CONSTITUTION:When a single slip 19 is inserted and discharged, a drive roller 12 is moved in contact with a pressure roller 11a, and then rollers 11a and 12 are slided on rotary shafts 9 and 14 and set to such a width that both ends of a single slip 19 are held. Aferwards, the single slip 19 is put into a guide 15 and a given operation is made, whereupon the drive roller 12 turns normally to feed the single slip 19. Since the pressure roller 11a is in a pivotally movable state with the boss 5b of a tractor 5a in this case, the tractor 5a is not driven. When using a continuous paper 17, the drive roller 12 is retracted in no-contact state, and then the widths of both tractors are determined so that the perforation 18 of the continuous paper 17 are coupled with the claws 7 of the tractor 5a and printing is started.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an improvement in a 7-link paper feeding device that is capable of using both continuous paper and single-sheet paper. This is related.

There are two types of paper printed with conventional technology printers: continuous paper and cut paper.
There are different types. Since these sheets have different structures and handling, the feeding mechanisms are also different. Generally, continuous paper is fed by a tractor, and cut-sheet paper is fed by a pair of rollers.
is being carried out.

Therefore, as shown in FIG. 1, this type of printer has a common printing section and is equipped with two types of feeding mechanisms.

The printing section generally includes a print head 1, an ink ribbon 2 whose tip end is W4, and a platen 3. Of these, the platen 3 has a printing surface 4 facing the print head 1 that is flat, and is designed to cope with high-speed printing.

Of the two types of feeding mechanisms mentioned above, one is this platen 3.
The tractor 5 is located above.

This tractor 5 has a circular shape and has a plurality of claws 7 on its outer surface 6, and a square hole 8 is provided in the center. A WJ rotating shaft 9 having a square cross section is slidably inserted into this hole 8, and the tractor 5 is intermittently rotated by this rotation m9.

The other v1 is a pair of rollers 10 located opposite the tractor 5. This roller 10 is composed of a pressure roller 11 and a drive roller 12. The pressure roller 11 slides on a construction shaft 13 and is supported to rotate. The drive roller 12 slides on a rotating shaft 14 having a rectangular shape, and is rotated forward and intermittently in reverse by this rotating shaft 14. The fixed shaft 13 and the rotating shaft 14 are formed by a ring frame (not shown) such that the pressure roller 11 and the drive roller 12 are in contact with each other.
The frame is rotatable around an axis provided in the printer. When the frame is pushed down, the pair of rollers lO retract to the position shown by the solid line in the figure, and when the frame is raised, the pair of rollers lO The roller 10 is moved directly above the platen 3, which is the position indicated by the two-dot chain line in the figure.

These feeding mechanisms 9 are provided with separate drive sources and are each driven independently.

Further, a paper guide 15 is provided below the platen 3 and is composed of two plates having a certain width. The paper guide 15 is located at a position spaced apart from the plane /3 by a certain distance, and its opening 16 is located directly below the prints (3) 4 on the platen 3.

In the printer configured in this way, the continuous paper 17
When printing on the paper, first, the pair of rollers 10 are retracted, then the continuous paper 17 is pulled up from between the platen 3 and the paper guide 15, and the continuous paper 17 is slid appropriately on the rotary shaft 9, so that both tractors 5.5 - is set, the feed hole 18 drilled at the end of the continuous paper 170 is hooked to the claw 7 of the tractor 5, and printing is started.

- When the printing of the number part is completed, the rotating shaft 9 rotates by the number part or number part and feeds the continuous paper 17.

On the other hand, when printing on the single thread paper 19, the above-mentioned frame is raised and moved directly above the pair of rollers 1 (Ji platen 3), and a guide (not shown) provided on the frame is inserted into the single thread paper. Adjust to the width of 19.

At this time, the pair of rollers lO also slides on the fixed shaft 13 and the rotating l1I114. The operator inserts a 19-karat sheet of paper into a kite that matches the width of the I5T foot, and then drives the kite.
~ to stop rotating. ) The lL form 19 is lowered and inserted to the printing position W, and stabilized within the opening 16 of the paper guide 15. After setting in this way, the operator operates the printer to start printing. - When the printing of the characters is completed, the rotating shaft 14 is intermittently reversed, and the monochrome paper 19 is discharged into the guide.

Problems with Non-Prior Art As mentioned above, in this printer, the printing space 4 of the platen 3 is formed flat in order to print continuously.

However, when the continuous paper 17 is set in this printer and printed, the continuous paper 17 may be stained with ink. This is because there is an angle θ between the printing surface 4 and the outer circumferential direction 6 of the tractor 5, so when using continuous paper 170, the continuous paper 17 may lift up from the printing surface 4 due to elasticity or other reasons, and the printing head This is because the tip of the ink ribbon 1 comes into contact with the ink ribbon 2 which is orbiting around the tip of the ink ribbon 1. As described above, the conventional paper feeding device had the disadvantage that the continuous paper 17 came into contact with the ink ribbon 2 and was soiled because the position of the tractor 5 was not appropriate.However, the conventional paper feeding device has two independent feeding mechanisms. It is natural that each of the above should be provided at a position where it does not get in the way, and it is unavoidable that the above-mentioned inclination of the angle θ occurs.

≠Object of the Invention The present invention was made in view of the above-mentioned drawbacks, and its purpose is to provide a paper feeding device that prevents the continuous paper from rising from the printing surface of the platen when printing using continuous paper. It is in.

4Y Structure of the Invention The paper feeding device of the present invention has a pressure roller arranged in parallel with the tractor in an idle axis state, with the pressure roller approximately equal to the diameter of the tractor, and the outer circumferential direction of the tractor is approximately on the extension of the printing surface of the platen. The tractor is arranged at a certain position, that is, at a position where the angle θ becomes zero, and the drive roller alone is retracted to a position where it is out of contact with the pressure roller and moved to a position where it is in contact. ing.

Embodiments of the Threatening Invention Below, specific embodiments of the present invention are shown in Figures 2 and 3.
This will be explained in detail with reference to the drawings.

A pair of conventional rollers 10 for inserting and ejecting a cut sheet 19
The pressure roller 11 and the drive roller 12 constituting the roller were both formed to have approximately the same diameter, and were configured to be in contact with each other. In contrast, the pressure roller lla in the present invention has a diameter that is approximately the same as the diameter of the tractor 5a.
is formed. And 111i1 of tractor 5a
A boss 5b is formed on the 1i surface, and the above-mentioned pressure roller lla is fitted onto the boss 5b with a free shaft. This may be done by using a bearing as shown in the figure, or by using a flat bearing made of nylon, or by using a clearance fit or other means to fit the pressure roller lla into the boss 5b on a loose shaft.

The tractor 5a, in which the pressure roller lla is arranged in parallel on the free shaft in this way, has an outer circumferential surface 6a that is substantially parallel to the platen 3.
It is arranged so that it is on an extension of the printing surface 4, that is, at a position where the above-mentioned angle θ is zero. Therefore, the continuous paper 17 on the platen 3 and the tractor 5a is not bent by the platen 3, so there is no repulsive force of the continuous paper 17 against the platen 3, and the continuous paper 17 is not bent by the platen 3.
The cause of floating from the printing surface 4 is also eliminated.

Then, the drive H-912 moves to a position where only the pressure roller lla mentioned above comes into contact with the pressure roller lla, that is, the position shown by the two-dot chain line in Fig. It is designed to retreat to a position where it comes into contact, that is, a position shown by the solid line in FIG. The drive roller 12 can be moved and retracted by a conventional method. In the paper feeding device configured in this way, when the continuous paper 17 is set on the tractor 53, only the drive roller 12 is moved to the second
It is evacuated to the position shown by the solid line in the figure. Continuous paper 17, which has been set in the same manner as before, is fed by the tractor 5a.

In this case, since the pressure roller lla installed in parallel with the tractor 5a is formed to have approximately the same diameter as the tractor 5, it does not get in the way of paper feeding, but rather keeps the continuous paper 17 flat. This has the effect of making it easier to maintain and print.

9. When inserting and ejecting the cut sheet 19 using this single sheet feeding device, first move the drive roller 12 to the position indicated by the two-dot chain line in FIG. I'll do what I do. Next, the pressure roller lla and the drive roller 12 are slid on both rotating shafts 9 and 14, and set to a width that will hold both ends of the cut sheet 190. In this case, since the pressure roller lla is arranged in parallel with the tractor 5a, this is done by sliding the tractor 5a on the rotating shaft 9. After the pressure roller lla and the drive roller 12 are set in this way, when the cut sheet 19 is placed in the guide and a predetermined operation is performed, the drive roller 12 rotates normally, and the cut sheet 19 is placed under pressure with this drive roller 12. It is held between rollers lla and inserted to the printing position. In this case, the pressure roller lla is arranged in parallel with the tractor 5a, but since it is in an idle axis state with the boss 5b of the tractor 5a, the pressure roller lla is
There is no such thing as driving.

After inserting the cut paper 19 at the printing position *1 in this way, when the egg is started, the drive roller 12 is intermittently reversed after printing the -gender part, and the cut paper 19 is ejected into the guide. .

Effects of a divine invention Generally, when a tractor is placed in a position where the outer circumferential surface of the tractor is an extension of the printing surface of the platen, it becomes difficult to insert and eject slip sheets. This issue has been solved by installing them in parallel.

In this way, in the present invention, the outer circumferential surface of the tractor can be made to be on the extension of the printing direction of the platen, that is, the angle θ can be set to zero degrees, so that the continuous paper does not rise from the printing surface of the platen. disappears, and as a result,
Now you can get clean prints without ink stains.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional paper feeding device, FIG. 2 is a perspective view showing an embodiment of the present invention, and FIG. 3 is a sectional view of a pressure roller. l°°゛Print head 2... Ink ribbon 3.
...Platen 4...Print surface 5.5a...
Tractor 5b...Boss 6...Outer surface
7... Claw 8... Hole 9... Rotating shaft 10... Pair of rollers 11. lla...Pressure roller 12...Drive roller 13...Fixed shaft 14...Rotating shaft 15...Paper guide 1
6... Opening 17... Continuous paper 18.
... Feed hole 19 ... Cut paper addition ... Bearing agent Patent attorney Noriyuki Chika (and 1 other person) Fig. 1 Fig. 2

Claims (1)

[Claims] In a printer that prints on both continuous paper and cut paper, there is a tractor for feeding the continuous paper whose outer periphery is an extension of the printing surface of the platen, and a free shaft coaxial with the tractor. 71 and has a pressure roller having the same diameter as the tractor; when using cut paper, the pressure roller contacts the pressure 1 cola to feed the cut paper, and when using continuous paper, it does not contact the pressure roller. A paper feeding top of a printer characterized by being equipped with a drive roller for paper feeding υ of a cut sheet which is retracted to a position where it is in a state.