JPH028074A - Recording paper clamp mechanism for color recorder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a recording paper clamp mechanism for clamping the leading edge of recording paper in a color recording device such as a thermal printer.

<Prior art> In recent years, the development of compact and low-cost color hard copy devices has been promoted, and as the mainstream of this type of device,
There is a color recording device using a transfer type heat-sensitive method, which heats an ink film tape with a thermal head and thermally transfers the ink to recording paper.

This color recording device uses a line-type thermal head to heat an ink film tape to melt the ink and thermally transfer the ink to recording paper.This thermal transfer operation is performed screen by screen in the order of yellow, magenta, cyan, and then black. This is done overlapping colors and records. The ink film tape is in the form of a roll with yellow, magenta, cyan, and then black arranged sequentially side by side.While this tape is advanced in one direction, the recording paper returns to its original position each time the color changes. Then, the colors are sequentially overlaid and recorded for each screen.

Therefore, it is necessary to move the recording paper back and forth three or four times, and if the recording paper is not fed accurately at this time, there is an important problem that color deviations occur.

Therefore, the present applicant devised a recording paper clamping mechanism for a color recording device that greatly improved the feeding accuracy of the recording paper by clamping the leading edge of the recording paper and feeding the paper, and the applicant proposed a paper clamping mechanism for a color recording device, which was published in Japanese Patent Application No. 151923/1983. has already been applied for. This recording paper clamping mechanism will be explained with reference to FIG. 5, which sequentially shows the recording paper clamping operation process. A rotating drum 2 arranged near the platen roller 1 and parallel to the roller 1 is
The recording paper 30 is connected to a winding drive source (not shown). Then, on one circumferential surface of the rotating drum 2, the rotating drum 2
A slit-shaped opening 4 is formed in the axial direction of the rotating drum 2, and a pair of rotary plates 5 (only one shown) rotatably attached to the rotating shaft (not shown) of the rotating drum 2 are connected by a bar 6. A movable paper clamp section 7 is provided on this bar 6, and this movable paper clamp section 7 is disposed at a position facing the opening 4. On the other hand, on one side edge of the opening 4,
A fixed paper clamp section 8 is provided opposite the movable paper clamp section 7. The rotating plate 5 is constantly urged clockwise in the figure by a spring 9 to press the movable paper clamp section 7 against the fixed paper clamp section 8, but the rotating drum 2 rotates in the direction of arrow B for more than a predetermined amount. When this happens, the rotary plate 5 is locked by the engagement between a pin and a stopper (not shown), and the paper clamp parts 7 and 8 are separated, as shown in FIG. becomes.

In the state where 30 cents of recording paper is possible as shown in FIG. The leading end of the rotary drum 20 is introduced between the paper cups 77 and 77 of the rotary drum 20 via the guide roller 13 after passing between the head 11 and the guide roller 13 .

When the insertion operation of the recording paper 3 is completed in this way, the rotary drum 2 rotates in the direction of the arrow A to the position shown in the figure (bl), and the biasing force of the spring 9 and the rotation of the rotary drum 2 in the direction of the arrow A As a result, the leading end of the recording paper 3 is clamped by both paper clamps 7.8, and the setting operation of the recording paper 3 is completed.

Next, when the ink film tape 14 is centered, the recording operation is started by driving the thermal head 11, and in synchronization with this recording scan, the rotating drum 2 changes from the state shown in FIG. The recording paper 3 is rotated in the direction of the arrow A as shown in FIG. to record one screen. In this way, when recording of one screen of yellow, for example, is completed, the rotating drum 2 is stopped, the thermal head 11 is separated from the platen roller 1, and the pressing against the recording paper 3 and the ink film tape 14 is released. .

Then, at the same time as the rotary drum 2 is rotated in the direction of arrow B, the platen roller 1 is rotationally driven in the opposite paper feeding direction to return the recording paper 3 to the printing start position shown in FIG. Further, the ink film tape 14 is set at the position of the next color, for example magenta, and the same operation as described above is repeated.

<Problems to be Solved by the Invention> The above-mentioned recording paper clamp mechanism clamps the leading edge of the recording paper 3 between the paper clamp sections 7 and 8 and winds the leading edge of the recording paper 3 along the circumferential surface of the rotating drum 2. The recording paper 3 can be fed, the paper feeding accuracy can be improved without slipping of the recording paper 3, and color misregistration can be reliably prevented. However, there remain problems that must be solved for practical use. That is, the contact portions of both paper clamp parts 7 and 8 are made of rubber, but when clamping the recording paper 3, if the unloaded recording paper 3 is directly pressed with the rubber, the recording paper Due to the warping or bending of the recording paper 3, either the left or right side of the recording paper 3 in the width direction may be fixed to the paper clamps 7 and 8 in a loose state. In such a case, when the recording paper 3 is pulled by the subsequent rotation start of the rotary drum 2, one side of the recording paper 3 will be pulled more strongly, causing lateral displacement of the recording paper 3.

Further, after the recording paper 3 is clamped by both paper clamp parts 7.8, when the rotating drum 2 rotates and the recording paper 3 is wound around the circumferential surface of the rotating drum 2, the recording paper 3 is brought into close contact with the rotating drum 2. It's hard to do.

Therefore, the paper feeding operation of the recording paper 3 becomes unstable, and printing misalignment may occur. In particular, print misalignment is likely to occur at the leading edge, and the thicker and stiffer the recording paper 3 is, the more noticeable the print misalignment becomes.

The present invention has been made in view of these conventional problems, and by simply adding a simple configuration, recording paper can be clamped without slack, and can be smoothly wrapped around a rotating drum for printing. A technical object of the present invention is to provide a recording paper clamping mechanism for a color recording apparatus that does not cause misalignment.

<Means for Solving the Problems> In the present invention, as a technical means for achieving the above-mentioned problems, a recording paper clamping mechanism of a color recording apparatus is configured as follows. In other words, in a recording paper clamp mechanism that clamps the leading edge of the recording paper in a color recording device that returns the recording paper to its original position for each color and records the colors overlappingly for each next screen, the mechanism is located near the platen roller. a rotating drum connected to a drive source; an opening formed in the axial direction of the rotating drum on one circumference of the rotating drum into which the leading end of the recording paper is inserted; and a rotating drum provided in the opening. A movable paper clamp section, a fixed paper clamp section that clamps the leading end of the recording paper between the movable paper clamp section, and an elastic presser provided on a surface of the movable paper clamp section facing the fixed paper clamp section. It is characterized by comprising a member.

Effect> When the leading end of the recording paper is clamped by both paper clamp sections, first, the recording paper is lightly pressed against the elastic pressing member such as a leaf spring of the movable paper clamp section. As a result, an appropriate load is applied to the recording paper, and in the process in which both the paper clamp parts are brought into pressure contact, the rotating drum rotates while the recording paper is sandwiched between the elastic pressing member and the fixed paper clamp part. The paper is slightly moved in the ejection direction, and tension is applied to the recording paper, so that the slack in the recording paper is removed and the recording paper is clamped, thereby preventing the recording paper from shifting laterally.

In addition, when the rotating drum starts rotating after being clamped, the elastic presser member allows the recording paper to fit easily onto the rotating drum, so that even thick recording paper can be smoothly wrapped around the circumferential surface of the rotating drum, preventing print misalignment. It never occurs.

<Example> Hereinafter, preferred examples of the present invention will be described in detail with reference to the drawings.

1 and 2 show one embodiment of the present invention, and FIGS. 3 and 4 show other embodiments of the present invention, and in these figures, the same as or equivalent to that in FIG. are given the same reference numerals and their explanations will be omitted. First, in the case of FIGS. 1 and 2, an elastic presser member 15 made of a plate spring bent in a dogleg shape is attached to the tip of the movable paper clamp part 7. The rubber 7a is fixed to cover the rubber 7a.

Therefore, as shown in FIG.
After the recording paper 3 is inserted between the two ends of the park 92 and the recording paper 3 is in a state where the recording paper 3 is ready to be sent, the rotary drum 2 starts rotating in the direction of the arrow A in the figure. When the fixed paper clamp section 8 begins to approach the movable paper clamp section 7, first, as shown in FIG. 3, a moderate load is applied by the elastic presser member 15 lightly pressing against it.

Then, in the process of further rotation of the rotating drum 2,
The recording paper 3 moves in a direction in which it is slightly removed from the rotating drum 2 while being held between the elastic pressing member 15 and the fixed paper clamp section 8. As a result, the slack on both the left and right sides of the recording paper 3 is eliminated, and thereafter, as shown in FIG. Since a tensile force acts on paper 3,
The recording paper 3 is clamped with any slack removed reliably.

Next, in FIGS. 3 and 4, three elastic press members 16 made of temporary springs are attached to the tip of the movable paper clamp section 7 in a protruding state at predetermined intervals.

Therefore, the leading edge of the recording paper 3 is held at both paper clamps 7.8.
When it is clamped and wrapped around the rotating drum 2,
The recording paper 3 is pressed against the circumferential surface of the rotating drum 2 by the elastic pressing member 16, so that the recording paper 3 is easily adapted to the rotating drum 2 and is wound smoothly. Therefore, printing deviations are extremely reduced, and in particular, printing deviations at the leading portion of the recording paper 3 are almost eliminated. Moreover, the above-mentioned effect of preventing print misalignment becomes more pronounced as the recording paper 3 becomes thicker and larger in shape.

It should be noted that the present invention is not limited only to the above description and illustrated examples, but may include various modifications without departing from the scope of the claims. For example, the elastic presser members 15 and 16 of the first embodiment and the second embodiment described above may be combined into an elastic presser member, and the material of this elastic presser member may be a temporary spring or the like. However, rubber or sponge-like materials with low hardness can also be used.

<Effects of the Invention> Since the present invention is configured and operates as described above, it produces the following effects. That is, according to the recording paper clamping mechanism of the color recording apparatus of the present invention, with a simple and inexpensive configuration that only adds an elastic pressing member to an existing mechanism, it is possible to eliminate slack in the recording paper and clamp it without lateral deviation, and also to clamp the recording paper with a thick In addition, even if the recording paper is large in shape, it can be smoothly wound around the rotating drum and print deviation can be minimized as much as possible.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of one embodiment of the present invention, Fig. 2 (al, (bl) is a partially enlarged view explaining the operation of Fig. 1, and Fig. 3 is a block diagram of another embodiment of the present invention. , FIG. 4 is a perspective view of FIG. 3, and FIG. 5 (al), (b), and (C) are explanatory diagrams of the operation of the conventional mechanism.Rotating drum recording paper opening Movable paper clamp part Fixed paper clamp part Elastic presser member

Claims (1)

[Claims] (1) In a recording paper clamp mechanism that clamps the leading edge of the recording paper in a color recording device that returns the recording paper to its original position for each color and records the colors one after another on each screen, the mechanism is located near the platen roller. , a rotary drum connected to a drive source, an opening formed in the axial direction of the rotary drum on one circumferential surface of the rotary drum into which the leading edge of the recording paper is inserted, and a rotatable drum provided in the opening. a movable paper clamp section; a fixed paper clamp section that clamps the leading end of the recording paper between the movable paper clamp section;
A recording paper clamping mechanism for a color recording apparatus, comprising: an elastic pressing member provided on a surface of the movable paper clamp section facing the fixed paper clamp section.