JPH0441345A - Printer device - Google Patents

Abstract

PURPOSE:To prevent recording paper from slipping off reference feed rollers by providing guide members for guiding the recording paper in such a way that deflection is generated to at least one part of the recording paper conveyed from the reference feed rollers. CONSTITUTION:There are provided a pair of auxiliary carrier rollers 29, 30, driven by the same drive source as reference feed rollers 23, 24, for performing conveyance while clamping recording paper in a position more on the downstream side in the conveying direction than the reference feed rollers 23, 24. Deflection is generated to at least one part of the recording paper positioned between the reference feed rollers 23, 24 and auxiliary carrier rollers 29, 30 by guide members 27, 28 provided between the rollers 23, 24 and 29, 30. This deflection is stretched out with the generation of mutual pulling of the recording paper between the reference feed rollers 23, 24 and auxiliary carrier rollers 29, 30. The recording paper is therefore prevented from slipping off the reference feed rollers 23, 24.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Field of Industrial Application) The present invention relates to a printer device that prints images from a personal computer, a television receiver, etc. onto recording paper.

(Prior Art) Conventionally, in a printer device that hard copies a display such as a CRT, a plurality of recording papers are stored in a paper supply case, and the recording papers are taken out one by one from the paper supply case and fed to a recording section. In some recording units, a transfer paper (ink sheet) and a recording paper are held under pressure between a thermal head and a platen roller, and ink is sequentially transferred and recorded onto the recording paper.

In such a printer device, when sequentially transferring and recording onto recording paper, a reference feed roller is driven by a pulse motor to convey the recording paper at a constant speed. In addition, in order to prevent paper jams, a conveyance auxiliary roller that assists the conveyance of the recording paper by a reference feed roller such as a paper ejection roller is placed on the leading edge side of the recording paper being conveyed (hereinafter referred to as
(referred to as downstream in the transport direction). Here, the standard feed roller and the auxiliary conveyance roller are driven by the same drive source, but due to variations in the rollers during manufacturing, the recording paper is pulled against each other between the standard feed roller and the auxiliary conveyance roller. Due to the tension, the recording paper sometimes slipped from the reference feed roller, making it impossible to perform accurate transfer recording.

For this reason, as described in Japanese Patent Application Laid-Open No. 63-117841, a clutch may be provided on the conveyance auxiliary roller, or
Alternatively, a method has been used in which a speed difference is provided between the reference feed roller and the conveyance auxiliary roller to bend the recording paper to some extent. However, these methods have the disadvantage that the structure becomes complicated and the manufacturing cost increases.

(Problems to be Solved by the Invention) In the conventional printer device described above, in order to prevent the recording paper from slipping from the reference feed roller, a clutch is provided on the conveyance auxiliary roller, and a clutch is provided between the reference feed roller and the conveyance auxiliary roller. Since the recording paper is flexed to some extent by setting a speed difference between the two, the structure has become complicated and the manufacturing cost has increased.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a printer device that eliminates the above-mentioned problems, has a simple structure, and can prevent the recording paper from slipping from the reference feed roller.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a pair of reference feed rollers that nip and convey recording paper at a reference speed, and a pair of reference feed rollers that are driven by the same drive source as the reference feed rollers, a pair of conveyance auxiliary rollers that sandwich and convey the recording paper at a position downstream in the conveyance direction from the reference feed roller; and a guide member that guides the recording paper so that at least a portion of the recording paper is deflected.

(Function) According to such a configuration, it is possible to cause at least a portion of the recording paper between the reference feed roller and the conveyance auxiliary roller to be deflected, and the recording paper between the reference feed roller and the conveyance auxiliary roller If the recording paper is pulled against each other,
Since the deflection is elongated, it is possible to prevent the recording paper from slipping from the reference feed roller.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the printer device according to the present invention, FIG. 1 is a side view of the main part of the paper ejection guide and its surrounding area during transfer recording, and FIG. FIG. 3 is a schematic side view showing the overall configuration of the printer device, and FIG. 4 is an explanatory diagram explaining the operation of the printer device shown in FIG. 3. be. First, explanation will be given using FIG. 3.

In FIG. 3, a paper feed case 3 that can accommodate a plurality of sheets of recording paper 2 in a stacked state is disposed at the lower part of the housing 1 of the printer device. Above this paper feed case 3 is a paper discharge case 4 into which the recording paper 2 after transfer recording is sent.
is installed.

Further, a recording section 5 is provided within the housing 1, and the recording section 5 is configured to transfer and record onto the recording paper 2 fed from the paper feed case 3.

The recording paper 2 is pulled out from the paper feed case 3 by a paper feed roller 6. That is, an open lower portion is formed at the top of the paper feed case 3, and a paper up plate 8 is provided at the bottom of the paper feed case 3. When the lever 9 lifts the paper up plate 8, the recording paper 2 is lifted in the direction of the lower opening, and the recording paper 2 is separated one by one from above by the separation claw 36.

Then, the recording paper 2 is fed by the paper feed roller 6 to the recording section 5 via the opening lower.

The recording paper 2 fed from the paper feed case 3 is placed in the paper feed guide 1.
0 and the switching guide 11, and is guided toward the platen roller 12 side. The paper feed guide 10 is made of sheet metal, resin, or the like, and the recording paper 2 conveyed substantially horizontally from the paper feed case 3 is turned diagonally upward by the paper feed guide 10 . A guide roller 13 is provided at the tip of the paper feed guide 10 on the platen roller 12 side, and is configured to smoothly guide the recording paper 2 diagonally upward. The platen roller 12 is
It has a cylindrical shape whose outer periphery is made of an elastic body, and is rotatable around a support shaft 14 . The platen roller 12 is provided with a bearing such as a ball bearing, and the recording paper 2
The structure is such that even if there is sliding contact, there will be no load on the conveyance of the recording paper 2.

A thermal head 15 is rotatably arranged at a position facing the platen roller 12, and the thermal head 15 is attached to a head plate 16. One end of the head plate 16 is rotatable about a support shaft 17 provided below the platen roller 12 of a side frame (not shown), and the other end is rotatably attached to a lever 18. The lever 18 is rotatably attached to a drive lever 20 that is rotatable about a support shaft 19, and the thermal head 15 is oscillated by the drive lever 20 being rotationally driven by a motor (not shown). There is. An ink sheet 21 is arranged between the thermal head 15 and the platen roller 12. The ink sheet 21 is wound around two reels of an ink cassette 22, and the exposed portion between the two reels is pressed against the platen roller 12 by movement of the thermal head 15. As the thermal head 15, a line type thermal head in which a large number of heating elements are arranged in a direction perpendicular to the conveying direction of the recording paper 2 is adopted. Further, the thermal head 15 is set to be inclined at a predetermined angle with respect to the traveling direction of the recording paper 2 when the recording paper 2 is supplied. Three colors of ink, yellow, magenta, and cyan, are sequentially and cyclically applied to the ink sheet 21 in the traveling direction of the ink sheet 21.
It forms three color bands. Marks for color identification are provided between these color bands.

A capstan 23 is rotatably disposed above the platen roller 12. The capstan 23 is the recording paper 2
The reference feed roller is driven by a pulse motor (not shown) and rotates at a constant pitch. For example, when the image density is set to 6 dots/Ill, the circumferential surface of the capstan 23 is set to 0, 167 u+/d.
It is designed to be rotated by ot.

Note that the capstan 23 has a relatively rough surface.
By increasing the friction between the recording surface of the recording paper 2 and the back surface, the recording paper 2 is prevented from shifting and color misregistration is prevented from occurring.

Pinch roller 2 is placed opposite this capstan 23.
4 is disposed so as to be swingable around a support shaft 25.

The pinch roller 24 has a cylindrical shape whose outer periphery is made of an elastic material, and is rotatable about a shaft 26 . The pinch roller 24 is provided with a bearing such as a ball bearing, so that even if the recording paper 2 comes into sliding contact with the pinch roller 24, it does not impose a load on the conveyance of the recording paper 2. The pinch roller 24 is
When feeding the recording paper 2, the recording paper 2 is rotated around the support shaft 25 by a DC motor (not shown), sufficiently separated from the capstan 23, and the recording paper 2 guided upward by the paper feed guide 10 and the thermal head 15 is delivered to the capstan. 23. In addition, the pinch roller 24
When transporting the recording paper 2, the recording paper 2 is rotated about the support shaft 25 and moved in the direction of the rotation axis of the capstan 23, and the recording paper 2 is pressed between the capstan 23 and the recording paper 2.

Paper ejection guides 27 and 28 are provided above the pinch roller 24 and above the capstan 23 to guide the recording paper 2 toward the paper ejection case 4 . A buffer area 41 is provided between the paper discharge guides 27 and 28 in order to give the recording paper 2 some flex while being conveyed. Recording paper 2 on which transfer recording has been completed
is guided by these paper ejection guides 27 and 28 and applied between the paper ejection roller 29 and the auxiliary roller 30. The paper ejection roller 29 and the auxiliary roller 30 are also transport auxiliary rollers, and the paper ejection roller 29 is driven by a pulse motor (not shown) or the like, and assists in transporting the recording paper 2 and also transports the recording paper 2 into the paper ejection case 4. It is designed to be sent to

The switching guide 11 is designed to swing around a shaft 37, and when the recording paper 2 is rewound from the platen roller 12 side, the recording paper 2 is moved between the switching guide 11 and the upper return guide 38. It is designed to be guided by.

A lower return guide 3 is located above the opening lower part of the paper feed case 3.
9 is provided to further guide the recording paper 2 guided between the switching guide 11 and the upper return guide 38 to the upper side of the lower return guide 39, and to guide the recording paper 2 from the paper feed case 3 to the recording side. It serves to guide the recording paper between the paper feed guide 10 and the switching guide 11 during feeding. Furthermore, a recording paper detection element 31 is provided below the paper feed guide 10 to detect whether the leading edge of the recording paper 2 has been conveyed. The recording paper detection element 31 is composed of a light emitting section and a light receiving section, and detects that the recording paper has reached a predetermined position, and outputs a control signal for winding up the ink sheet 21. On the other hand, the thermal head 15 is provided with an ink sheet color detection element 32, which is composed of a light emitting part and a light receiving part, and a reflection plate 33.
It is set opposite to. Then, when the ink sheet 21 is wound up, light is irradiated through the ink sheet 21 and reflected by a reflecting plate, and the reflected light is received through the ink sheet 21. When the color identification mark on the ink sheet 21 is detected, the ink A signal for stopping winding of the sheet 21 is output. A light emitting section 3 of a recording paper detection element 34 is located above the paper ejection guide 27 and below the paper ejection guide 28, respectively.
4a and a light receiving section 34b are provided. When the recording paper detection element 34 detects that the leading edge of the recording paper 2 has been conveyed to the paper ejection guide 2728, it stops the paper feed roller 6 and sends a signal that causes the capstan 23 and the pinch roller 24 to pinch the recording paper 2. I am trying to output . A recording paper detection element 35 is provided below the paper ejection guide 28 on the paper ejection case 4 side to detect whether the rear end of the recording paper 2 has been conveyed.

The recording paper detection element 35 is composed of a light emitting section and a light receiving section.
The trailing edge of the recording paper 2 is detected at the time of ejection, and a signal is output to start preparation for transfer recording of the next recording paper 2.

The operation of such a printer device will be explained with reference to FIG. 4. First, as shown in FIG.
2 and are sufficiently spaced apart. Also, capstan 2
3 and the pinch roller 24 are also sufficiently spaced apart.

When the printer device is switched from stopped to fed, the recording paper 2 is first pressed against the paper feed roller 6 by the lever 9 in the paper feed case 3, and is sent out from the opening lower by the rotation of the paper feed roller 6, and is delivered to the recording section. 5. The recording paper 2 fed from the paper feed case 3 is provided between the paper feed guide 10 and the switching guide 11, and is guided to the platen roller 12 side, as shown in FIG. 4(b). At this time, the thermal head 15 is moved to a position close to the platen roller 12 by rotationally driving the drive lever 20 . Then, the recording paper 2 passes between the platen roller 12 and the thermal head 15 , is held under pressure by a capstan 23 and a pinch roller 24 , and is conveyed to the paper ejection case 4 side by the rotation of the capstan 23 and pinch roller 24 . be done. After this, as shown in FIG. 4(C), the detection element 34
When detecting the leading edge of the recording paper 2, it provides a detection signal to an external circuit (not shown). As a result, the capstan 23 and the pinch roller 24 rotate in the opposite direction to the above to move the recording paper 2 into the fourth position.
The thermal head 15 returns to the position shown in FIG.
The recording paper 2 is pressed and held against the platen roller 12. Then, the recording paper 2 is held under pressure between the capstan 23 and the pinch roller 24.
3. It moves with the rotation of the pinch roller 24, and the leading edge of the recording paper 2 is guided between the paper discharge guides 2728. The recording paper guided between the paper ejection guides 2728 is
As shown in e), the paper ejection roller 29. The capstan 23. is pressed and held by the auxiliary roller 30. Pinch roller 24. Paper ejection roller 2
9. It moves with the rotation of the auxiliary roller 30, and the first color ink is sublimated by the heat generated by the heating element according to the signal power, and an image is transferred and recorded. - When the recording of the color is completed, the thermal head 15 is separated from the platen roller 12 by the rotation of the drive lever 20, and during this time, the capstan 23
．． Pinch roller 24. Paper ejection roller 29. Auxiliary roller 30
The rotation of will move it to the recording start position again. in this case,
The switching guide 11 rotates around a shaft 37, and after placing the rear end of the recording paper 2 between the upper return guide 38 and the switching guide 11, the second color and the third color are changed to the first color. will be recorded in the same way. When the recording of the third color is completed, the thermal head 15 is separated from the platen roller 12, and during this time, the capstan 23. Pinch roller 24. By rotating the paper ejection roller 29° and the auxiliary roller 30, the recording paper 2 is ejected to the paper ejection case 4 side.

Here, the paper ejection guide 2 in the printer device of this embodiment
The structure of 7.28 and its surrounding area will be explained in more detail with reference to FIG.

In FIG. 1, during transfer recording, the recording paper 2 is held in pressure contact with the ink sheet 21 by the thermal head 15 and the platen roller 12, and the capstan 2
3 and pinch roller 24,
Due to the rotational force of the capstan 23, the paper ejection case 4fl!
It is designed to be transported to l.

The paper ejection guide 27 has a first slope portion 27a facing obliquely upward toward the paper ejection case 4 near the pinch roller 24, and a substantially horizontal horizontal surface portion bent in the horizontal direction at the upper part of the slope portion 27a. 27b, a second slope portion 27c is formed on the side of the paper discharge case 4 of this horizontal surface portion 27b and is bent downward, and furthermore, a second slope portion 27c is bent horizontally again at the bottom of the second slope portion 27c. This is a horizontal horizontal surface portion 27d. On the other hand, the paper discharge guide 28 has an arc-shaped curved part 28a formed above the capstan 23, and a slope part 28b facing diagonally upward on the paper discharge case 4 side formed above the curved part 28a. The upper portion of the portion 28b is bent to form a substantially horizontal horizontal surface portion 28c. The paper ejection guide 27 is arranged above the paper ejection guide 28 with an appropriate interval for passing the recording paper 2 between the slope portion 27a and the slope portion 28b and between the horizontal surface portion 27d and the horizontal surface portion 28c. There is. The portion surrounded by the first slope portion 27a, the horizontal surface portion 27b, the second slope portion 27c, and the horizontal surface portion 28c has a wider interval than the above-mentioned interval, and serves as a buffer area 41 that bends the recording paper 2. ing. Auxiliary rollers 30. A paper discharge roller 29 is provided. Paper ejection roller 29. The auxiliary roller 30 is configured to press and nip the recording paper 2, which is guided by the paper discharge guides 27 and 28 and is transported in a bent state, and transports the recording paper 2.

The operation of transporting recording paper in the paper ejection guides 27, 28 and their surrounding areas in such a printer will be described with reference to FIG.

During recording, the recording paper 2 is first conveyed at a constant speed toward the slope portion 27a by the rotation of the capstan 23° and the pinch roller 24, and the leading edge of the recording paper 2 comes into contact with the lower surface of the slope portion 27a. After that, the leading edge of the recording paper 2 is placed at the sloped portion 27.
slide the lower surface of a toward the horizontal surface portion 27b. As a result, as shown in FIG. 2(a), the paper surface of the recording paper 2 is brought into contact with the curved portion 28a, and the vicinity of the leading edge of the recording paper 2 is brought into contact with the horizontal surface portion 28a.
7b direction.

After sliding on the slope portion 27a, the recording paper 2 slides toward the slope portion 27c with its leading end abutting the lower surface of the horizontal surface portion 27b, as shown in FIG. 2(b). In this case, from the leading edge of the recording paper 2 to the part that abuts the curved part 28a, the slope part 27a
The recording paper 2 is curved close to the lower surface of the horizontal surface portion 27b, so that the leading edge of the recording paper 2 faces toward the paper ejection case 4.

After the recording paper 2 slides on the horizontal surface portion 27b, the leading edge of the recording paper 2 reaches the slope portion 27.
c and slides toward the horizontal surface portion 27d. As a result, the leading edge of the recording paper 2 is curved downward. Thereafter, the recording paper 2 is further conveyed, and the leading edge of the recording paper 2 comes into contact with the upper surface of the horizontal surface portion 28c, and the paper ejection roller 29. It slides between the auxiliary rollers 30. As a result, Fig. 2 (C)
As shown in FIG. 2, the paper surface of the recording paper 2 is brought into contact with the bending portion between the slope portion 27c and the horizontal surface portion 27d, and the leading edge of the recording paper 2 is curved in the horizontal direction. After this, the recording paper 2 is
), the tip is connected to the paper ejection roller 29 and the auxiliary roller 3.
It is sandwiched between 0 and 0. At this point in time, the recording paper 2 is in a curved and bent state in the buffer area 41. And capstan 23 pinch roller 24. Paper ejection roller 29. The rotation of the auxiliary roller 30 transports the recording paper 2 to the paper ejection case 4 side.

According to such an embodiment, the recording paper 2 is attached to the capstan 2.
3. It is held between the pinch rollers 24 and the paper discharge roller 29. When the thermal head is driven to perform transfer recording while being conveyed while being held between the auxiliary rollers 30, the capstan 23. The paper ejection roller 29. Even if the conveyance speed by the auxiliary roller 30 becomes faster temporarily, the difference in conveyance speed is absorbed by the bending of the recording paper 2 being lengthened by the buffer area 41, and the difference in conveyance speed is absorbed by the cab stand 23. Recording paper 2 from pinch roller 24
Contrary to the above, the paper ejection roller 2
9. Even if the conveyance speed by the pinch roller 30 becomes slower, the recording paper 2 is further bent in the M new area 41, so that the difference in conveyance speed is absorbed. As a result, the recording paper 2 is transferred to the capstan 23. Transfer recording is performed by always moving relative to the thermal head based on the rotation of the pinch roller 24.

In this way, by simply providing the M new area between the part sandwiched between the capstan 23 and the pinch roller 24 and the part sandwiched between the paper ejection roller 29 and the auxiliary roller 30, accurate transfer recording can be achieved on the recording paper 2. can be carried out, and manufacturing costs can be reduced.

[Effects of the Invention] As described above, according to the present invention, it is possible to prevent the recording paper from shifting due to the speed difference between the rollers with a simple structure, and it is possible to improve the performance of the printer device and reduce the manufacturing cost. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a paper ejection guide and its surrounding parts, which are the main parts of an embodiment of a printer device according to the present invention, and FIG. 2 explains the recording paper guiding operation by the paper ejection guide shown in FIG. 1. FIG. 3 is a schematic side view showing the overall configuration of the printer device shown in FIG. 1, and FIG. 4 is an explanatory view explaining the operation of the printer device. 2... Recording paper, 23... Capstan, 24, 30
... Pinch roller, 27.28 ... Paper ejection guide, 2
9... Paper ejection roller, 30... Auxiliary roller, 41...
・Buffer area.

Claims (1)

[Scope of Claims] A pair of reference feed rollers that nip and convey the recording paper at a reference speed, and a pair of reference feed rollers that are driven by the same drive source as the reference feed rollers and that are located downstream of the reference feed rollers in the conveyance direction. a pair of conveyance auxiliary rollers that sandwich and convey the recording paper; and a pair of conveyance auxiliary rollers provided between the reference feed roller and the conveyance auxiliary roller, wherein at least a portion of the recording paper conveyed from the reference feed roller is bent. What is claimed is: 1. A printer device comprising: a guide member that guides the printer.