JPS6076366A - Serial type thermal printer - Google Patents

Abstract

PURPOSE:To enhance printing quality, by providing a notch for inserting a thermal head in the vicinity of the corner part of a cassette for storing a thermal transfer ink ribbon while providing a guide member for setting a peel-off angle. CONSTITUTION:A notch 6 for inserting a thermal head 18 is provided to the corner part of a cassette 4 and the thermal head 18 is arranged to the space between the notch 6 and an ink ribbon 5 and moved during the forward process of printing operation to be brought into contact with the ink ribbon 5. By this constitution, the ink ribbon 5 is exposed out of the cassette 4 at the corner part of said cassette 4 and a peel-off angle theta can be taken largely with reason and printing quality is ehnanced. In addition, a guide member for setting the peel-off angle theta, that is, a pin 30 is arranged. The pin 30 sets a predetermined separating angle theta when the thermal head 18 is pressed to the side of a platen 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a so-called serial type (J'-multi printer) equipped with a cassette for storing an ink ribbon for thermal transfer.

(Prior Art) The schematic structure of a conventional thermal printer of this type can be shown in FIGS. 1 to 3. In these figures, 1
is a platen, and a recording paper 3 is pressed against the platen 1 by a paper presser 2. 4 is a Jt 1- in which a thermal transfer ink ribbon 5 is housed, and a rectangular notch 6 is provided in the center of the end on the platen 1 side. The ink ribbon 5 is exposed to the outside at this cutout portion. Further, one end of the ink ribbon 5 is fixed to a take-up roller 7, and the other end is fixed to a delivery roller 8. The take-up roller 7 is manually rotated by the knob 19 as necessary, and during the forward stroke of the printing operation (when moving in the right direction in FIGS. 1 and 3), the drive seat t771-9 is rotated by J, J, etc. It is designed to be rotated. Reference numeral 10 denotes a cullet holder, which is fixed to the 4-split 11. The loading of the Karen [.4 into the Karen 1-Small holder 10 is done while borrowing the [lI lobe of the (f/positioning bin 12).The carriage 11 is
3, and moves in the lateral direction of FIGS. 1 and 3. The drive of A is carried out by a belt 16 that is wound between the drive pulley 14 and the driven pulley 15 and is locked to the carriage 11. , by being moved by a motor 17 via the drive pulley 14. Reference numeral 18 denotes a round head disposed in the space between the notch 6 of the cassette 4 and the ink ribbon 5, and the lower part thereof is a round head 11.
It is pivoted so that it can tilt freely. Although not shown, the thermal head 18 is constantly urged by a spring in the direction away from the ink ribbon 5 (that is, it is urged so as to maintain the position shown in FIG. (when moving rightward in Figures 1 and 3), the ink ribbon 5 side is forcibly tilted using a solenoid, etc., so that the back side of the ink ribbon 5 (ink is not applied 1). The recording paper 3 is pressed against the platen 1 to bring the surface of the ink ribbon 5 into contact with the recording paper 3. Further, 20 is a felt rod, and 21 is a felt plate, which are in contact with both sides of the ink ribbon 5 using the elastic force of a leaf spring 22. Therefore, dust and the like attached to the ink ribbon 5 are removed here.

In the recording of the 1J''-multi printer in such a configuration, the carriage 11 is moved in the lateral direction in FIGS. 1 and 3, and the platen 1 is moved in the direction of the arrow in FIG. 1 for each horizontal printing. Intermittent driving is performed. Note that during the backward stroke of the printing operation (when moving to the left in FIGS. 1 and 3), the thermal head 18 is separated from the ink ribbon 5, and the thermal transfer will not be carried out.

Incidentally, in serial type/legal printers, there is a demand for increased printing speed, and attempts are being made to make the base of the ink ribbon 5 thinner. However, due to this whitening, even if the ink ribbon 5 is peeled off from the recording paper 3 after thermal transfer, it cannot be peeled off successfully.
There was a problem that print quality deteriorated. According to the experiment of the present invention, this problem can be solved with a peeling angle of 0 (see Figure 3).
It turned out that the problem could be solved by covering the cassette 4 to a large extent.
Since a notch 6 for inserting the thermal head 18 is provided at the medium heat end of the butylan 1 side, the peeling angle θ is
It is difficult to make it large, and if you try to make it too large, a large amount of tension will be applied to the ink ribbon 5, and there is a problem that the ink ribbon will be cut and covered during the printing operation due to the thinning of the base. .

Further, in order to perform printing of even higher quality, it is necessary to change the peeling angle O depending on the surface smoothness of the recording paper 3 and the printing speed. However, no such measures have been taken in the past.

(Objective of the Invention) The present invention has been made in view of the above points, and an object thereof is to realize a serial type 4-printer with excellent printing quality.

(Structure of the Invention) The structure of the present invention that achieves this object is that a notch for inserting the thermal head is provided near the corner of the cylinder 1 for storing the ink ribbon for thermal transfer, and the above-mentioned is inserted in the space near the notch. The apparatus is characterized in that the thermal head is configured to be able to contact the ink ribbon, and a guide member is installed to set a peeling angle at which the IJ-mal head comes into contact with the ink ribbon. be.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 4 is a partially cutaway plan view showing the main parts of an embodiment of the present invention. In this figure, correspondence J
The same reference numerals are used to denote the same parts, and the explanation thereof will be omitted. The first point in which this embodiment is significantly different from the thermal printer shown in FIGS. 1 to 3 is that a notch 6 for inserting the thermal head 18 is provided at the corner of the cassette 4. The thermal head 18 is placed in the space between the notch 6 and the ink ribbon 5, and during the first stroke of the printing operation, the thermal head 18 is moved as shown in FIG. 5 and comes into contact with the ink ribbon 5. The point is that it is configured so that

As a result, the ink ribbon 5 is exposed outside the cassette 4 at the corner of the cassette 4 where the ink ribbon 5 bends as it is wound around the take-up roller 7. A large peeling angle θ can be easily achieved. This improves print quality! can be done. Further, by adopting this configuration, it is possible to easily move the thermal head 18 to the edge of the recording paper 3, and it is also possible to obtain the effect that printing can be performed up to the edge of the recording paper 3.

The second major difference is that a guide member, ie, a pin 3o, is provided for setting the peeling angle θ.

The bin 30 has a thermal head IJ as shown in FIG.
3 is pushed against the platen 1 side and removed, and synchronously moved to the platen 1 side to set a predetermined pulling angle θ. An example of this bottle 300 is shown in FIG.
A substantially U-shaped pin consisting of a, 30b and a horizontal arm portion 30c is movably supported in the middle of the horizontal arm portion 300, and the vertical arm portion 30 is in sliding contact with the ink ribbon 5.
The a side is urged downward by a coil spring 31, and a base 32 with several supports is attached to the fulcrum and one end of the coil spring 31.
to the cassette holder 10 and carriage 11.
It is configured so as to be movable in the vertical direction in FIGS.

Here, the vertical arm part 30b is pushed by the upper cover of the fifth cassette 4, and moves downward when the cassette 4 is loaded. Therefore, the vertical arm 18 portion 30b is connected to the ink ribbon 5.
'Inside': to hunt. On the other hand, the movement of the base 32 is performed by a solenoid or the like that drives the above-mentioned nurse head 18. This enables movement in synchronization with the thermal head 18 described above. Furthermore, the movement of the solenoid, etc. is controlled by a mechanism capable of expanding and contracting the displacement (a long hole is bored in the center in the longitudinal direction, a fulcrum such as a bottle is fitted therein so as to be movable, and the position of the fulcrum is adjusted). It is configured to be transmitted to the base 32 via a lever, etc. that enables the printing, and depending on the surface smoothness and printing speed of the recording paper 3
The amount of movement of the base 12 (in other words, the peeling angle θ) is arbitrarily set to 1q. Therefore, in combination with the ability to increase the peeling angle θ mentioned above, the printing quality can be significantly improved.
can be done.

Incidentally, reference numeral 23 in FIG. 4 is a reflection type photolen I for detecting the completion of feeding of the ink ribbon 5, and is fixed to the carriage 11 side. This end detection sensor is
It does not need to be a reflective fluorometer as described above,
It may also be a transmission type photosensor, which has been widely used in the past.

Further, in the above explanation, the case where the ink ribbon 5 is moved above FIGS. 4 and 5 using the bin 30 is shown, but there is no need to limit it to this, and as long as the desired peeling angle θ can be obtained. The movement may be in any direction.

Furthermore, the guide member need not be limited to the bottle 30.

Furthermore, when the bin 30 is moved when the cassette 4 is loaded, the space into which the thermal head 1B can fit is expanded, and the interference between the ink ribbon 5 and the thermal head 18 during loading is eliminated, and the force can be reduced. [This enables reliable loading of the ink ribbon 4 and prevention of damage to the ink ribbon 5.

Further, as shown in FIG. 7, one end is rotatably supported by a pin 41, and a pin 42 is erected at the other end. A link 43 made of an elastic plate is rotated counterclockwise by a coil spring 47. At the same time, the extending portion 43a on the rotating end side is pressed against the stopper 4.
831), the release bottle 45 is pushed from the carriage 11 side to the right in FIG. The connection is released, and the link 43 is moved to the other stopper 46.
Rotate counterclockwise until it touches the. In the state after this rotation, since the bin 42 has moved downward in FIG. 7(A), the ink ribbon 5 is
This will allow it to wrap around itself, giving you a sharp peeling angle.

Note that the release bin 45 can also be provided on the carriage 11 side.

(Effects of the Invention) As explained above, according to the present invention, the peeling angle of the ink ribbon can be greatly reduced, and the peeling angle can be set to J and T in the guide 10-portion 4A. So.

Print quality can be significantly improved.

[Brief explanation of drawings]

Figure 1 shows the main structure of the conventional example! 1. Figure 1 is a perspective view, and Figure 2 is a side view.
Figure 3 is a partially broken view. Further, FIG. 4 is a partially cutaway view showing the main part of an embodiment of the present invention, and FIG. 5 is a plan view showing another operating state of the main part of the embodiment of FIG. Figure 6 is an explanatory diagram of the bottle, Figure 7 is Caret 1.
- This is a diagram showing an example of a configuration in which a large peeling angle is automatically set during loading.
['') is an AA sectional view of (A). 1...Platen 2...Paper presser 3...Recording paper 4...Currency[- 5...Ink ribbon 6...Notch 7...Take-up roller 8...Feeding [1-] Ra 9... Drive shaft 10... Force [Bit holder 11... Carriage 12... Positioning bin 13... Guide shaft 117
1- 16...Belt 18...Thermal head 30...
・Bin (guide member) 31...Coil spring 32...Base patent applicant
Roku Konishi Photo Industry Co., Ltd. Agent Patent Attorney Harutoshi Ijima 6 Figure 3゜Figure 7 (A) (B) Procedural Amendment October 31, 1981 Patent Application No. 185246 2, Invention Name of Serial Thermal Printer 3, Person making the amendment, Incident, etc. Patent Applicant Address: 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name (
Name>(127> Konishi Roku Photo Industry Co., Ltd. 1-5, Date of amendment order Voluntary 6, Drawing subject to amendment 7, Contents of amendment as attached)

Claims (4)

[Claims] (1) A notch for insertion of the thermal head is provided near the corner of the slot that stores the ink ribbon for thermal transfer, and the thermal head is configured to come into contact with the ink ribbon in the space near the notch. The serial type thermal printer is characterized in that the thermal head is provided with a guide member for setting a peeling angle at which the ink ribbon comes into contact with the ink ribbon. (2) The thermal printer according to claim 1, wherein a bottle on which the ink ribbon slides is used as the guide member. (3) The serial mold printer according to claim 1 or 2, wherein the guide member is movably stepped near a corner of the cassette. (4) The serial type thermal printer according to claim 1 or 2, wherein the guide member is provided at a position corresponding to the vicinity of the force hit corner of the carriage.