JP3295954B2 - Printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus capable of printing on a plurality of types of printing media.

[0002]

2. Description of the Related Art The prior art is disclosed in Japanese Patent Laid-Open No. 2-2146.
The printing device disclosed at 75 is known. The content disclosed herein is that the pickup roller 12 is located above the platen 1 and rearward (right side in FIG. 5) of the platen 1 as shown in FIG. 5, and the drive shaft 16 of the tractor 17 is located above the platen 1 and the pickup roller 1
It is located behind 2.

[0003]

However, in the above-mentioned prior art, since the angle .theta. Formed between the paper sliding surface of the tractor 17 and the printing surface of the continuous paper at the printing position is 90 degrees or less, the medium must be directed at an acute angle by the platen 1. A curvature occurred in the change platen 1. The inner paper and the outer paper have different paper lengths by the radius of the paper thickness and the angle wrapped around the rollers. In a continuous copy form with a large total paper thickness, the first and second papers are different. In the paper, a relative displacement occurred in which the printing position was shifted in the paper feeding direction. According to the experiment, when the angle θ between the paper sliding surface 17a of the tractor 17 and the printing surface is smaller than 90 degrees or larger than 270 degrees, the restoring elastic force of the printing medium increases, and for example, at the printing position P, the printing medium is higher than the platen 1. As a result, printing stains are generated and noise is increased, and the paper path load is increased, so that it is difficult to secure the paper feeding accuracy.

[0004]

According to the first aspect of the present invention,
Write a record on the recording paper at the printing position on the platen circumference.
A paper feeder for feeding cut paper as the recording paper
And a tractor that feeds continuous paper as the recording paper,
A printing device provided with the feeding device below the platen.
A paper device and the tractor are arranged side by side,
The pickup roller provided at the position
And the tractor is located behind the printing position.
Between the recording paper transport surface of the tractor and the printing position.
The printing surface of the continuous paper becomes 90 degrees or more and 270 degrees or less.
, And the paper feeder and the tractor,
Support on the same support member and move the support member horizontally
The transport member is provided . Claim 2
The invention according to claim 1, wherein the pickup
A paper feed auxiliary roller is installed between the roller and the tractor.
It is characterized by According to a third aspect of the present invention, in the first aspect, a plurality of sets of the paper feeder and the tractor supported by the same support member are provided, and these are stacked and arranged.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. The same numbers indicate the same parts.

FIG. 1 is a main sectional view of a first embodiment of the present invention. The print head 2 is provided at a position where the print element operates in the normal direction of the platen 1 via a gap through which a print medium and an ink ribbon can pass. The rear portion 3a of the paper guide 3 is composed of a straight portion extending in the tangential direction of the platen 1 and a curved portion having an arc shape concentric with the platen 1, and is provided at a position where a paper path can be formed between the paper guide 3 and the platen 1. . Paper feed rollers 4 and 5 are provided upstream of the printing position P, and are pressed against the platen 1 by elastic force applying means (not shown). A discharge roller 7 is provided downstream of the printing position P at a position where a paper path is formed between the discharge roller 7 and the discharge cover 6. Further, paper feed rollers 9 and 10 are provided below the platen 1 upstream of the printing position P.

The pickup roller 12 of the automatic sheet feeder is provided below the platen 1 and forward of the platen 1. The pickup roller 12 is pressed into the shaft 11 and supported by the cassette 13 via the shaft 11. A cassette lid 14 is placed on the cassette 13. Axis 1
1, a structure composed of the pickup roller 12, the cassette 13, and the cassette lid 14 is hereinafter referred to as a cassette unit. The drive shaft 16 of the tractor 17 is provided below the platen 1 and behind the pickup roller 12. The tractor 17 is supported by the drive shaft 16 and the guide shaft 18, and the angle θ between the paper sliding surface 17a of the tractor 17 and the printing surface at the printing position P is set to be 90 degrees or more and 240 degrees or less. Further, auxiliary paper feed rollers 20 and 22 are provided between the pickup roller 12 and the tractor shaft 16. Sheet guides 22 and 2
Reference numeral 3 denotes an upper portion of the auxiliary paper feed rollers 20 and 21, which is provided between the pickup roller 12 and the tractor drive shaft 16. The lower sheet guides 22 and 23 may be formed by one part.

The housing 101 has a rotating hinge 101a.
Cover 102 is engaged through the cover. Housing 101
Is located on the lower housing 104. The housing cover 103 is a rotating hinge 104 of the lower housing 104.
a. The housing 101 and the lower housing 104 may be formed as an integral part. FIG. 2 is a sub sectional view of the first embodiment of the present invention. Drive motor 2
The pinion 25 press-fitted into 4 is engaged with the paper feed transmission gear 26. The paper feed transmission gear 26 has a paper feed auxiliary gear 2
7 is engaged with the planetary gear 31 via the planetary lever 32. A tractor gear 28 and a first paper feed auxiliary gear 29 are engaged with the paper feed auxiliary gear 27. The tractor gear 28 is connected to the tractor shaft 16 via an electromagnetic clutch or the like (not shown).
Is engaged. The first auxiliary feeding gear 29 is engaged with the second auxiliary feeding gear 30. Pickup roller gear 3
3 is engaged with the planetary gear 31 via the pickup auxiliary gear 34 and is pressed into the pickup roller shaft 11.
All gears are supported by pins or the like planted on the frame 35. The lower sheet guides 22 and 23 are also supported by the frame 35. Note that the pickup gear 33 and the pickup roller shaft 11 need only be able to transmit the driving force in the paper feeding direction, and may not be press-fitted.
Further, the driving force of the tractor 17 to the driving shaft 16 is turned ON and OF.
As the F means, a switching means using a cam or the like may be used instead of the electromagnetic clutch. Further, the paper feed gear 26 and the paper feed auxiliary gear 27 may be reduction gears.

The bent portion 35a of the frame 35 contacts the transport rollers 37 and 39 supported by the lower housing 104. The notch 35b of the frame 35 is the lock lever 3
6 is engaged with the protrusion 36a. The lock lever 36 is provided with the protrusion 36a, the operation unit 36b, the rotation center 36c,
The rotation center 36c is supported by the lower housing 104 and the like.

FIG. 3 is an operation diagram of the first embodiment of the present invention.
When the user presses the operation portion 36b of the lock lever 36, the lock lever 36 rotates about the rotation center portion 36c as a fulcrum, the projection 36a is released from the cutout portion 35b of the frame 35, and the frame 35 is horizontally moved. Contact part 38
Is conveyed backward by, for example, a spring or the like until it contacts the conveyance roller 39. At this time, the housing cover 103 has fallen backward about the hinge 104a as a rotation center. The user sets the continuous paper 19 on the tractor 17 in this state. After the continuous paper 19 is set, it is confirmed by a detector or the like (not shown) that the frame 35 and the housing cover 103 have been returned to predetermined positions by, for example, a user's force, and then the paper selection mode is confirmed. This will be described with reference to FIG. For example, when continuous paper is selected, the drive motor 24 is driven clockwise to drive the tractor gear 28 counterclockwise via the pinion 25, the paper feed transmission gear 26, and the paper feed auxiliary gear 27. At this time, the electromagnetic clutch (not shown) is engaged, the driving force is transmitted to the tractor drive shaft 16, and the continuous paper is sent out from the tractor 17. At this time, the planetary gear 31 and the planetary lever 32 hit the protrusion 43 provided on the frame 35 and idle. On the other hand, when the automatic sheet feeder for cut sheets is selected, the drive motor 24 rotates counterclockwise, the paper feed transmission gear 26 rotates clockwise, and the planetary gear 31 engages with the pickup auxiliary gear 34. Then, the pickup roller gear 33 is driven to drive the pickup roller 12 counterclockwise via the shaft 11 to feed out the cut sheet.

As shown in FIG. 1, the continuous paper 19 sent out from the contactor 17 is sent out to the paper feed rollers 9 and 10 and passes through the gap between the platen 1 and the print head 2 so that the paper output roller 7 and the paper output cover 6 The paper is discharged through the paper path formed therebetween. The cut sheet 15 sent out to the pickup roller 12 is also sent out to the paper feed rollers 9 and 10, passes through the gap between the platen 1 and the print head 2, and is formed between the paper output roller 7 and the paper output cover 6. The paper is discharged through the paper path. At this time, the platen 1, the paper discharge roller 7, and the paper feed rollers 9 and 10 may be driven by the drive motor 24 or may be driven by another drive motor. The paper feed rollers 20 and 30 driven via the first paper feed auxiliary gear 29 and the second paper feed auxiliary gear 30 are provided to feed the print medium fed from below to the paper feed rollers 9 and 10. .

With the above arrangement, it is possible to feed a print medium from below the platen 1. By providing an automatic cut-sheet paper feeder and a continuous paper tractor 17 below the platen 1, the entire paper path can be controlled. In the paper having a small curvature and a large total paper thickness, the paper thickness difference has an effect of reducing the contribution rate that affects the relative deviation in the paper feeding direction. Further, by setting the angle θ between the paper sliding surface 17a of the tractor 17 and the printing surface of the printing position P at 90 ° or more and 270 ° or less, the winding angle of the roller at the portion having a small curvature can be reduced, and the relative deviation in the paper feeding direction can be reduced. This has the effect of reducing the restoring elasticity of the print medium, reducing print stains, reducing noise, reducing the paper path load, and easily securing paper feed accuracy.

FIG. 4 is a sectional view of a second embodiment of the present invention.
The second pickup roller 40 is below the platen 1
In addition, it is provided in front of the platen 1 and below the first pickup roller 12. Second tractor drive shaft 4
1 is a second pickup roller 4 below the platen 1
It is provided behind 0.

The paper fed from the second pickup roller 40 and the tractor 42 is fed to paper feed assist rollers 29 and 30.
, And further sent to paper feed rollers 9 and 10 to be discharged. Other structures and operations are the same as those described above.
The configuration of the second embodiment of the present invention has the effect of increasing the types of print media simultaneously supported. Either the pickup roller 40 or the tractor shaft 42 may be plural.

[0015]

As described above, according to the present invention, the pickup roller of the automatic sheet feeder is provided below the platen of the printing apparatus and forward of the platen, and the drive shaft of the tractor is located below the platen. In addition, since it is provided behind the pickup roller, the curvature of the entire paper path is reduced, and the contribution of the difference in the paper thickness to the relative deviation in the paper feeding direction is reduced in the paper having a large total paper thickness, and the relative deviation of the continuous paper is reduced. Can be reduced. Furthermore, the angle θ between the paper sliding surface 17a of the tractor 17 and the printing surface of the printing position P is set to 90 degrees or more and 270 degrees or less, so that the winding angle with respect to the paper feeding roller can be reduced, and the relative deviation in the paper feeding direction is reduced. However, since the restoring elastic force of the printing medium can be reduced, there is an effect that printing dirt is reduced, noise is reduced, paper path load is reduced, and paper feeding accuracy is easily ensured. Further, the number of types of printing media supported at the same time is increased, which has the effect of improving the paper setting property of the user.

[Brief description of the drawings]

FIG. 1 is a main sectional view of a first embodiment of the present invention.

FIG. 2 is a sub sectional view of the first embodiment of the present invention.

FIG. 3 is an operation diagram of the first embodiment of the present invention.

FIG. 4 is a sectional view of a second embodiment of the present invention.

FIG. 5 is a side view illustrating a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Platen 2 Print head 12 Pickup roller 16 Tractor drive shaft 20 Paper feed auxiliary roller 21 Paper feed auxiliary roller 35 Frame 37 Transport roller 39 Transport roller

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B41J 11/00-11/70 B65H 3/00-3/68

Claims (3)

(57) [Claims] 1. A paper feeder for feeding cut paper as the recording paper so as to perform recording and writing on the recording paper at a printing position on a platen circumference, and a tractor for feeding continuous paper as the recording paper. In the printing apparatus, the paper feeder and the tractor are provided below the platen.
Pick-up rollers arranged side by side and provided in the paper feeder
The roller is located ahead of the printing position and the tractor
Is behind the print position and the record of the tractor
90 degrees between the paper transport surface and the continuous paper print surface at the print position
At an angle of not less than 270 degrees and
The device and the tractor are supported by the same support member, and
A printing device comprising a transport member for moving a support member in a horizontal direction . 2. The pickup roller and the tractor.
2. The printing apparatus according to claim 1, further comprising a paper feed auxiliary roller provided between the printer and the printer. 3. The paper feeder supported by the same support member.
And a plurality of sets of tractors and
The printing device according to claim 1, wherein the printing device is arranged .