JPS63272153A - Thermal transferring and copying device - Google Patents

Abstract

PURPOSE:To contrive compact size and maintenance-free of a device by transmitting a signal to a print from an image input part, copying the image of the original on an original base glass onto the copying paper of a printing part and arranging the travelling direction of the image sensor of the image input part and the sending direction of the copying paper at right angles. CONSTITUTION:The titled device is constituted in such a way that the signal from an image input part 30 is transmitted to a printing part 10, the image of an original 3 on the original base glass 2 is copied on the copying paper 12 of the printing part 10 and also the travelling direction of an image sensor 36 of the image input part 30 and the sending direction of the copying paper of the printing part 10 are arranged at right angles. Thus, the original image read by the image sensor 36 is printed by a thermal head through a thermal ink sheet and can be copied on a normal paper not to be surface-processed. Since the sending direction of the copying paper 12 is at the right angle direction with the original travelling direction and a copying surface comes to be upward and ejected, the confirmation of copying condition is facilitated.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention includes a thermal transfer type printing unit using an edge-type thermal head and a thermal ink sheet, and an image sensor unit that reads original images. The present invention relates to a thermal transfer copying device that copies images onto plain paper.

(Conventional Example) In recent years, various types of copying devices have been realized and become popular. In general, direct printing type copying machines that use surface-treated paper such as thermosensitive coloring paper, and electrostatic type electrophotographic copying machines that use plain paper are well known.

An electrophotographic copying machine is a device that makes copies using plain paper without surface treatment, and there are electrostatic charges, exposures, fMs, etc. around the photoreceptor drum made of selenium, etc.

After arranging mechanisms such as image, transfer, and cleaning, and charging the surface of the rotating photoreceptor drum, the irradiated light image of the original is sequentially slit-exposed using optical means such as mirrors and lenses, and the latent image is developed with toner. This toner image is transferred to plain paper that is fed synchronously, and the copy paper on which the toner image has been transferred is fixed under heat and pressure to obtain a copy.

(Problems to be Solved by the Invention) However, although the above-described direct printing type copying apparatus has a simple configuration and can be downsized, it cannot use plain paper.

Further, in an electrophotographic copying apparatus that can use plain paper, a certain amount of volume is required because the optical system such as mirrors and lenses is moved to perform slit exposure. For this reason, there is a limit to the reduction in size of the configuration, making it difficult to make the device more compact. Furthermore, in order to heat and fix the toner image, it is necessary to provide a fixing device having a heat source of about IKW, which causes an increase in power consumption and an increase in the internal temperature of the machine.

Therefore, it was necessary to provide a preheat control means to reduce power consumption and an exhaust fan to discharge the heated air to the outside of the machine.

Furthermore, since fine powder toner is used for development, the toner powder is scattered inside the machine, contaminating the interior of the machine, and having an adverse effect on copied images. Therefore, in order to obtain stable copies of high quality, various problems have occurred, such as the need for maintenance work to periodically clean the scattered toner powder.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a thermal transfer copying apparatus that is compact, lightweight, and does not require maintenance as in conventional apparatuses.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the thermal transfer copying apparatus of the present invention has a document platen glass on which an original to be copied is placed, and an image input section including an image sensor provided to scan the original; a thermal head having a print width equal to the image forming width of the copy paper; a roller pressed against the thermal head; A thermal ink sheet that is located between a head and a roller and is sent from a supply shaft side to a take-up shaft side by rotation of the roller, and a printing section that feeds copy paper between the roller and the thermal ink sheet to perform thermal transfer printing. transmitting a signal from the image input unit to the print unit to copy the image of the x document on the document table glass onto the copy paper of the print unit; The copying paper is configured such that the traveling direction and the feeding direction of the copy paper in the print section are arranged at right angles.

(Function) According to the present invention, with the above-described configuration, the original image read by the image sensor is printed by the thermal head via the heat-sensitive ink sheet, and can be copied onto plain paper without surface treatment. .

Further, since the copy paper is fed in a direction perpendicular to the original scanning direction and is ejected with the copy side facing upward, it becomes easy to check the copy state.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a thermal transfer copying apparatus according to an embodiment of the present invention. In Fig. 1, there is a document platen glass 2 on the front side of the main body 1 on which a document to be copied is placed, and the document 3 placed on top of this is pressed down so that it comes into close contact with the document platen glass 2. The document table cover 4 is
It is supported so that it can be opened and closed using the back side 5 as a fulcrum. The document platen glass 2 is arranged to be horizontally long when viewed from the front so that an A4 size document can be placed horizontally. A print section 10 for copying images onto copy paper is provided on the rear side of the main body 1.

The print section 10 is first provided with a copy paper insertion slot 11 for inserting copy paper.
Insert one end of 2. The inserted copy paper 12 is held leaning against the guide M13 so that it does not fall down and come out from the insertion slot 11. Guide lid 1
3 is supported by a hinge at the innermost position of the main body 1,
It can be opened and closed.

The guide M13 can be closed to cover the copy paper insertion slot 11 and the like when the main body 1 is not used.

A copy paper output port 14 is located in front of the copy paper insertion port 11.
The guide plate 15 that forms the opening is provided with an opening of
As shown in Figure 4, the feeding direction of copy paper ■2 and the
Copy paper 1
2 can use up to the maximum size of A4 size paper, and the A4 size paper is fed in the longitudinal direction, and is copied upward from the copy paper outlet 14 and comes out. Copy paper 12 coming out from copy paper outlet 14
is printed and ejected in such a direction that the printed copy image can be seen when viewed from the front side, and if the copy paper is paper with low rigidity, it will fall toward the copy paper insertion slot 11 side. There is. Therefore, the person making the copy can perform the copying operation while always checking the printed surface from the front side.

In this embodiment, the JiX document 3 is set so as to align with the corner of the left front edge 20 of the document table glass 2.
Also, the copy paper 12 is placed at the right end 2 of the copy paper insertion slot 11.
I try to set it according to 1.

When copying onto paper having a width narrower than A4 size, a copy paper guide 22 slidably provided in the copy paper insertion slot 11 is slid to match the width of the copy paper.

A start button 23 is provided on the top surface of the main body 1, and a power switch 24 is provided on the left side of the main body.

FIG. 2 is a cross-sectional view of the image sensor unit provided under the J)K draft table glass 2. FIG.

In the image sensor unit 30, a sensor main body 33 is placed on a sensor base 32 which is slidably guided by a guide shaft 31 fixed to the main body 1.

The sensor body 33 includes an illumination LE for illuminating the original.
A D array 34, a light converging fiber lens 35 for forming and projecting an optical image of the original at the same magnification, and a contact type image sensor 36 provided on the imaging plane of the original image are attached.

If the positional relationship between the document 3 placed on the document platen glass 2 and the contact image sensor 36 is not set correctly, the optical image projected onto the contact image sensor 36 will be out of focus, resulting in a contact image. An appropriate output signal will not be obtained from the sensor 36.

In this embodiment, rollers 37 are provided at the front and back ends of the sensor body 33 in order to accurately provide a distance between the document surface and the contact image sensor 36, and the rollers 37 are attached to the sensor base. It is pushed upward by a compression spring 38 provided between the sensor body 32 and the sensor main body 33, and slides while contacting the lower surface of the document table glass 2 while rotating. Therefore, if the thickness of the original platen glass 2 is kept constant, the copy surface of the original placed on the original platen glass 2 and the contact image sensor 36 can always be kept constant.

FIG. 3 is a perspective view showing a method of driving the image sensor unit. A guide shaft 31 is fixed along the longitudinal direction of the document table glass 2, and the image sensor unit 30 is guided by the guide shaft 3.

While the roller 37 slides on the lower surface of the document table glass 2, the fixed end 41 is pulled by the belt 40 and moves from side to side. belt 4
0 is stretched between the left and right ends of the main body 1, and is driven by the rotation of a pulse motor 42. Image sensor unit 1-3
0 is driven by a pulse motor 42 to reciprocate between an origin switch 43 and an end point switch 44. The power supply to the LED array 34 of the image sensor unit 30 or the output from the image sensor 36 is connected to a flat line 39.
It is connected to the main body side.

As shown in FIG. 4, the end wall thermal head 50 is mounted substantially upward from the bottom of the substrate of the main body 1.

Thermal heads have traditionally been used in thermal recording type facsimile machines, electronic typewriters, word processors, computer printers, etc. due to their features such as being maintenance-free, noiseless, and inexpensive.However, the thermal heads traditionally used are flat type. This is called a printed circuit board on one side of a flat board.

Each circuit element, Inx, has a heating element section in which, for example, 8 dots of fine heating elements are arranged in a row.

Although it has the advantage of being easy to manufacture because of its planar arrangement, the area occupied by the thermal head becomes large, which is not desirable in terms of making the device more compact.

On the other hand, the thermal head 50 used in this embodiment is called an end wall, and as shown in FIG.
A glass glaze layer is formed on the end face 51, and a heating resistor film is formed on the glass glaze layer on the end face 51, and the heating resistor film is connected to the circuit element 60 on the side surface through an electrode film.

In this embodiment, the heating element formed on the end face 51 is composed of heating elements divided into 8 dots per 1 mm over a 210 m width of A4 size paper. However, it is not necessarily necessary to have the same length as the width of the paper surface, but it is sufficient that the length dimension is the same as the image forming dimension of the paper surface. The surface of the heating element is protected by a wear-resistant protective film. The end wall thermal head has a convex heating element surface and has the following characteristics: good thermal transfer characteristics, good linearity of the heating element forming surface, uniform printing density, and compact head. have. As shown in FIG. 4, a supply shaft 53 and a winding shaft 54 for the thermal ink sheet are arranged on both sides of the end-face type thermal head. A heat-sensitive ink sheet 55 is attached to the supply shaft 53.
is rolled up with its heat-sensitive ink surface facing outward, and this heat-sensitive ink sheet 55 is guided to the heating element end face 51 of the thermal head 50 while being under tension downward with a metal weight shaft 56. ing. As shown in Figure 5,
The heating element end surface 51 is pressed from above by a transfer roller 59 made of a rubber material and held by a roller frame 58 that can be opened and closed about a fulcrum 57.

The transfer roller 59 has a length of 220IffI+, a diameter of 20nm at the center, and a diameter of O, 1 at both ends.
It has a cylindrical shape that is 5 nm small. Diameter 20m+
is the range of 70 temples in the center, with a diameter of 19 cm at both ends from that position.
．． The 85aa part is a linear tapered finish. By making the transfer roller 59 into a cone shape and pressing both ends with springs weighing about 1.2 kg on each side, the adhesion between the transfer roller 59 and the end surface 51 of the heating element is improved, and uniform density can be obtained over the entire width. It will be done.

Further, the cylindrical transfer roller 59 also serves to prevent wrinkles that tend to occur on the thermal ink sheet 55 and the copy paper 12.

Note that the shape of the cylindrical transfer roller is such that its tapered portions are connected by straight lines, but in this example, connecting them with straight lines was more effective against wrinkles than connecting them with curves.

Immediately to the left of the contact surface of the transfer roller 59 on the end face 5 of the heating element, a blade 61 made of a plastic material is fixed as shown in detail in FIG.

The heat-sensitive ink sheet 55 that has passed through the heating element end face 51 is wound up on the winding shaft 54 so that the heat-sensitive ink surface is on the inside. As shown in FIG. 6, the edge 62 of the blade 61 is in the tangential direction of the transfer roller 59, which is in pressure contact with the end surface 51 of the heating element, and is approximately 7 an apart from the contact position on the downstream side in the copy paper feeding direction. Therefore, the copy paper 12 is fed into the gap between the transfer roller 59 and the thermal ink sheet 55, is suppressed and heated by the transfer roller 59 and the thermal head 50, and the ink is transferred to the copy paper 12 until it reaches the edge 62. During this period, the copy paper 12 and the thermal ink sheet 55 are fed in close contact for a certain period of time, and then the thermal ink sheet 55 suddenly changes its direction downward at the edge 62, and the copy paper 12 continues straight. The angle of the edge 62 of the blade 61 is less than 90".

The downward direction change toward the heat-sensitive ink sheet 55 is made rapid.

The thermal ink sheet 55 is then wound around the winding shaft 54 at an angle of 0 with respect to the feeding direction.

If the angle O is 30'' or more, it will affect the separation of the copy paper 12, but it is preferably between 60'' and 90°.

In addition, if it is 90'' or more, a better separation effect will be produced, but
It should be noted that the arrangement of the thermal head 50 changes.

The thermal head 50 transfers the ink to the copy paper 12.
The ink transferred to the copy paper 12 is heated by the heat-sensitive ink sheet 12 and separated after a certain period of time has passed, and the ink transferred to the copy paper 12 cools down and is sufficiently adsorbed to the copy paper surface before being peeled off. Never take sides,
This results in good transfer.

Furthermore, the position of the edge 62 where the thermal ink sheet 55 and the copy paper 12 separate is in the tangential direction of the transfer roller 59, and while the copy paper 12 tends to move straight due to its rigidity, the thermal ink sheet 55 haetsuji 6
As a result of the sudden direction change in part 2, the copy paper 12
and the heat-sensitive ink sheet 55 are well separated. The heat-sensitive ink sheet supply shaft 53 and take-up shaft 54 are held in a casing 70, as shown in FIGS. 4 and 5.

The ink sheet cartridge 71 has a casing 70. Supply shaft 531, winding shaft 54, weight shaft 56. It consists of a heat-sensitive ink sheet 55.

Ink sheet cartridge 71 when copying is used.

It is used by being loaded onto the thermal head 50 from above. The casing 70 of the ink sheet cartridge 71 is
The open lower 2 has a lower surface into which the thermal head 50 can be inserted, and the heating element end surface 5 of the thermal head 50 has an upper surface.
An open lower lower 3 is provided so that the upper surface of the lower part 1 can protrude slightly. Felt is used as a bearing for the supply shaft 53, and this felt is fixed to the casing 70, and the frictional resistance generated when the supply shaft 53 rotates causes the pack tension when the heat-sensitive ink sheet 55 is wound onto the winding lPm54. It works to give. Similarly, the weight shaft 56 also serves to absorb torque fluctuations when the thermal ink sheet 55 is wound up, and also serves to provide pack tension.

The upper surfaces 83 and 84 of the casing 70 of the ink sheet cartridge 71 also serve as guide surfaces for the copy paper 12, as shown in FIG. The upper surface 83 on the entrance side is set at such a height that when the copy paper 12 is inserted, its leading edge is just guided into the nip formed by the transfer roller 59 and the heating element end surface 51 of the thermal head 50. The upper surface 84 on the exit side is formed by the edge 62 of the blade 61 after the ink is transferred.
When the thermal ink sheet 55 is separated and the copy paper 12 continues straight, a guide surface is formed to prevent the leading edge of the copy paper from falling down due to being pulled by the thermal ink sheet 55. The upper surface 84 guides the leading edge of the copy paper 12 to the copy paper outlet 14. The reason why the step 85 is provided in the middle of the top surface 84 is that when the previous copy operation is completed and the next copy is made, the previous copy paper is pushed by the leading edge of the previous copy paper and falls into the step 85. It is provided for the function of being held. The winding shaft 54 of the thermal ink sheet and the transfer roller 59 are driven by the same pulse motor (not shown). The driving force of the pulse motor is transmitted to the transfer roller 59 via a gear train for deceleration, whereas the driving force to the winding shaft 54 is transmitted by a slip mechanism made of felt and a spring provided on the way. Therefore, even if the thickness of the thermal ink sheet 55 wound around the winding shaft 54 changes and the diameter increases, a constant amount of the thermal ink sheet 55 fed at the peripheral speed of the transfer roller 59 is always wound up reliably. ing.

When the same number of pulses are applied to the pulse motor for driving the transfer roller 59 and the pulse motor 42 for driving the image sensor unit 30, the transfer amount of the copy paper 12 sent by the transfer roller 59 and the image sensor unit 3
The reduction ratio is set so that the amount of movement of 0 is equal.

It is Reitong that black is used for general copying,
In this embodiment as well, the heat-sensitive ink sheet 55 is coated with black ink, but the color is not limited to black.
A variety of thermal ink sheets can be used, such as red, blue, green, yellow, cyan, magenta, brown, gold, silver, etc. To replace the heat-sensitive ink sheet 55, the roller frame 58 is opened upward and the ink sheet cartridge 71 is installed and removed (FIG. 5).

Next, a procedure for actually performing copying according to this embodiment will be explained. First, after confirming that the ink sheet cartridge 71 is correctly set, the power switch 24 is turned on. The original platen cover 4 is opened and the original 3 to be copied is set face down on the original platen glass 2. Insert the copy paper 12 from the copy paper insertion slot 11. Adjust the copy paper guide 22 according to the width of the copy paper 12. When the copy paper 12 is inserted into the copy paper insertion slot 11 and the leading edge of the copy paper 12 reaches the nip between the transfer roller 59 and the thermal ink sheet 55 covering the heating element end surface 51 of the thermal head 50, the paper sensor 75
is turned on and the copy is enabled.

When the copy start button 23 is pressed in this state, the pulse motor 42 and the pulse motor for driving the transfer roller 59 start rotating, the image sensor unit 30 starts scanning the document 3, the transfer roller 59 starts rotating, and the copy paper 12 When the ink sheet 55 is sent, the heating element of the thermal head 50 is heated according to the image of the document 3, and the thermal ink sheet 55 is heated.
The melted ink is transferred to the copy paper 12 according to the image. In this embodiment, the copy paper guide 22 is adjusted to match the width of the copy paper 12. next,
This adjustment mechanism will be explained.

As the copy paper guide 22 slides, the rack and m
! Copy paper guide 22 via a deceleration mechanism by tt.
movement is transmitted to the slide volume.

The resistance value of this slide volume is electrically detected and
Depending on the value and the dimensions of the copy paper guide 22, a non-printing portion 81 of about 5 m on both ends in the width direction is created. Although it is possible to continuously change the print width according to the value of the slide volume, in this embodiment, the generally used paper size A4. B5. A5. B6
The width changes step by step. However, it is not limited to this.

Corresponding to the paper width set by the leading edge of the copy paper 12 and the copy paper guide 22, as shown in FIG. 7, there are areas 80 and 81 where no printing is performed, each having a length of about 5 m. Since printing is stopped when the trailing edge of the copy paper 12 passes the paper sensor 75, there is also a portion 82 where no printing is done for about 5 mm at the trailing edge of the copy paper 1z.

The non-printing portion 80 at the leading edge of the copy paper 12 has a great effect in ensuring that the copy paper 12 and the thermal ink sheet 55 are separated when they begin to separate at the edge 62. The non-printed areas 81 on both sides of the copy paper 12 are
is wider than the copy paper 12, the copy paper 12
This prevents unnecessary ink from being transferred to the transfer roller 59 due to heat being applied to the thermal head 50 up to the portion where there is no .

When the image sensor UNISO 1-30 reaches the end point switch 44, it begins to return. However, the transfer roller 59 continues to rotate as long as the paper sensor 75 detects the presence of paper. Therefore, even if an extremely long copy paper arrives and the image sensor unit 30 finishes scanning, the copy paper 12 continues to be fed, so Mr.

Also, when copy paper that is short in length arrives, the paper sensor 75 detects the end of the paper, and after a while the transfer roller 5
Since the rotation of 9 is stopped, there is no need to use too much extra heat-sensitive ink sheet.

The image sensor unit 30 returns to the same starting position as before the start of scanning and stops.

In this embodiment, when the copy paper is set in the copy paper insertion slot 11 again during the return operation until the image sensor unit 30 returns to the start position, the image sensor unit 30 automatically returns to the start position and the next copy is automatically inserted. This is useful when making multiple copies in succession.

(Effects of the Invention) As is clear from the above description, the present invention provides a document table glass on which an original to be copied is placed, and an image provided to scan the document on the lower side of this XX placing table glass. It consists of an image input section fixed to the document table consisting of a sensor, a printing width that can print across the entire width of the copy paper, and a roller that is pressed against this. A print section includes a thermal ink sheet that is fed from the roller to the take-up shaft side, and a print section that feeds copy paper into the gap between the roller and the thermal ink sheet to perform thermal transfer printing, and a print section that prints signals from the image input section. When copying a document onto copy paper by transmitting it to the copying section, the image sensor of the image input section is arranged so that the running direction of the image sensor and the feeding direction of the copy paper of the printing section are arranged at right angles. As a result, first of all, the copying machine itself can be made very compact, and the structure is also simple, making it difficult for a single sheet to jam, making it possible to provide a copying machine that is very easy to use.

Furthermore, as a result, there are fewer failures and no maintenance is required.

The reason why it becomes more compact when the running direction of the image sensor and the feeding direction of the copy paper are perpendicular to each other is that the running range of the image sensor cannot be made any smaller depending on the document size, whereas the printing section only has the drive roller part. The area it occupies is small. For example, if we consider a configuration in which the running direction of the image sensor and the feeding direction of the copy paper are parallel, and if we install the image sensor section on the top and the printer section on the bottom, then the area occupied will be the size of the original. Although it may be possible to make the dimensions close to that of This results in a very complicated structure. In the present invention, the printer section is arranged behind the part where the image sensor runs, and the start switch etc. It is possible to arrange the parts, drive pulse motor, etc., and it is possible to have a very simple structure.

As is clear from the above description, the present invention has a small flat area and height, and the document table is fixed, making copying operations easy. It has various excellent features such as being able to see the copy as it is, making it easy to check the copy status.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a thermal transfer copying device according to an embodiment of the present invention, and FIG. 2 is a sectional view of an image sensor unit of the present invention.
FIG. 3 is a perspective view of the image sensor unit of the present invention, FIG. 4 is a cross-sectional view of the main part of the print section of the present invention, and FIG. A sectional view of the main parts showing where the
FIG. 6 is a cross-sectional view showing details of the thermal head of the printing section of the present invention, and FIG. 7 is a plan view of a copy sheet for explaining the present invention in detail. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document glass, 3...Original, 10...Print section, 11...Copy paper insertion slot, 12...Copy paper, 14...Copy paper output 1 piece, 22... Copy paper guide, 30...
...To image sensor unit 1, 33...Sensor body, 34...LED array, 35...Light convergence fiber lens, 36...Image sensor, 3
7... Roller, 38... Spring, 50... Thermal head, 53... Supply shaft, 54... Winding shaft, 55... Thermal ink sheet 1~, 56... Weight shaft, 59... Transfer roller, 61... Blade, 71... Ink sheet cartridge, 72, 7
3...Opening, 83.84...Top surface. Patent Applicant Matsushita Electric Industrial Co., Ltd. Figure 1 1 Y/Salary 2
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Claims (2)

[Claims] (1) An original platen glass on which a document to be copied is placed, an image input unit consisting of an image sensor installed to scan the original under the original platen glass, and an image forming width of the copy paper or its width. a thermal head having a width longer than , a roller that is pressed against the thermal head, and a thermal ink sheet that is located between the thermal head and the roller and is sent from the supply shaft side to the take-up shaft side by the rotation of the roller. , a printing unit configured to feed copy paper between the roller and the thermal ink sheet to perform thermal transfer printing, transmitting a signal from the image input unit to the printing unit, and transmitting a signal from the image input unit to the printing unit to print an image of the document on the document platen glass. A thermal transfer copying apparatus which copies onto copy paper in the print section, and wherein the running direction of an image sensor in the image input section and the feeding direction of the copy paper in the print section are arranged at right angles. (2) The heat generating part of the thermal head is arranged almost upward, and the copy paper is fed into the print part from the side opposite to the side where the image input part is arranged, so that the original image is printed by the thermal head part. Copy paper is
The thermal transfer copying apparatus according to claim 1, further comprising a guide plate whose feeding direction is changed by 90 degrees or more so that the copied image can be viewed from the image input side.