JPS60155480A - Feeder - Google Patents

Abstract

PURPOSE:To prevent a printing position from being staggered, by a construction wherein a support member for both ends of a feeding member brought into contact with and separated from a platen is constituted of a pair of split pieces, and both end parts of the feeding member are supported independently from each other, in a thermal transfer type color printer. CONSTITUTION:Both end parts of a pinch roller 7a are independently supported by a pair of links 25a, 25b. For example, even when the pinch roller 7a is fitted skewly against the platen 5, the roller 7a can be pressed against the platen 5 uniformly over the entire surface by independently moving the end parts of the roller 7a. Accordingly, a paper clamped between and fed by the platen 5 and the pinch roller 7a is fed by the same distance on both left and right sides, so that skewing of the paper does not occur even when the paper is fed forward and reversely for multi-color printing, and the printing position is securely prevented from being staggered in overlap printing.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to, for example, a thermal transfer color printer.

The present invention relates to a conveying device for printing multiple colors on one sheet of paper in a color copier or the like.

[Technical background of the invention and its problems]

Figure 1 shows an example of a thermal transfer color printer.

This is what is shown. In FIG. 1, paper P stored in a paper feed cassette 1 is moved by a paper feed roller 2 to a pulse motor 10.
The sheets are taken out one by one by being driven by the aligning roller sh and the SBT pulse motor 10, and the leading edge is aligned above the aligning row, 93m, 3bK. 29a and the brake plate 28. At this time, the paper feed side-inch roller 27b
is connected to solenoid 8b, paper discharge side pinch roller 7a is connected to solenoid #aK7', and solenoid 1 is connected to
Since the thermal head 7 is not energized, the thermal head 11 is separated from the roller 5. The thermal head 11 has a spring body 16
It is attached to the top and has a degree of freedom up, down, left and right.

Then, by the mother motor 10, 2 ten rows 25
is rotated counterclockwise, the transfer paper winding section 13 is rotated clockwise by the pulse motor 18, and the solenoid 17 is depressed to advance the paper P in the C direction by the platen row 25 and the transfer paper 14. Also, pinch o on the paper output side.
A detector 21 for detecting the leading edge of the paper P is provided near the top of the roller 2a.The detector 21 detects the leading edge of the paper P. The O detector 21 is composed of, for example, a light emitting element and a light receiving element. When the leading edge of the paper P is detected, the rotation of the pulse motor 18 is stopped, and the conveyance of the transfer paper 14 is stopped. Further, the solenoid 12 separates the thermal head 11 from the platen roller 5, the solenoid 8a presses the paper discharge side pinch row 57m against the platen row 25, and the rotary solenoid 34 is rotated clockwise as shown in FIG. 28 in the E direction and press the paper P with the rubbing material 30.
sandwich.

In this state, the platen row is
) 5 in the clockwise direction, the paper P is bent and wound around the platen roller 5 between the rubbing member 30 and the paper discharge side pinch roller 7a. Thereafter, the solenoid 8b presses the paper feed side pinch roller 7b against the platen roller 6, and at the same time rotates the rotary solenoid 34 counterclockwise to rotate the brake plate 28 in the E' direction, thereby connecting the platen roller 5 and the paper discharge side. The platen roller 5 is rotated clockwise to near the part where the pinch roller 7a contacts, and the paper P is conveyed in the reverse direction. After the reverse feeding is completed, the thermal head 11 is brought into pressure contact with the platen roller 5 by the solenoid 17,
Also, when the transfer paper 14 is wound up by rotating the transfer paper winding section 13 clockwise, the Kf platen rotor 2
5 counterclockwise, and then remove the thermal head 11.
heating record begins. That is, in this portion, the ink on the transfer paper 14 is heated and melted by the thermal head 11 and transferred to the paper P. The transferred paper P passes between the paper ejection guides 33m and 33b, and is moved to the paper ejection tray by the paper ejection rows 26m and 6b until the rear end of the paper P reaches the area where the platen roller 5 and the paper feed side pinch roller 7b are in contact. It is discharged at 35. Thereafter, by rotating the rotary solenoid 34 clockwise, rotating the brake plate in the E direction, and simultaneously turning off the solenoid 17 to separate the thermal head 11 from the platen row 25 and rotating the platen roller 5 clockwise. Paper transport guide 32m
, 32b. In this case, the brake plate 28 prevents the paper P from reaching the paper conveyance guides 32a, 32b.
When it reaches the E/force direction, the paper P is conveyed in the opposite direction to the printing start position. After that, the same operation is repeated for the number of oak colors on the transfer paper 14, and when the transfer is completed, the paper is discharged to the paper discharge tray 35.

In thermal transfer color printers such as J&>, a problem arises when the printing position is shifted by one point when overlapping printing is performed.Precise paper transport is required.The platen roller 5 is normally replaced by a rubber roller 2. pinch roller 7
a + 7 b is composed of metal row 2. Conventionally, a mechanism as shown in Fig. 3 was used to move the
Pinch low 27& with the force of 0a'20&''
25, and when releasing the link 23, the solenoid 8a is used to pull the link 23. However, in this case, if the link 23 is shifted left and right, the relationship between the platen roller 5 and the pinch roller 7a will not be as shown in FIG. As shown in FIGS. 9 to 9, the paper P was conveyed, which was a major cause of the 6" deviation in the printing position.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a conveying device which has a relatively simple structure and can reliably suppress the displacement of printing positions in overlapping printing.

[Summary of the Invention] In order to achieve the above object, the present invention comprises a holding member that holds both ends of a feeding member that approaches and separates from a platen, and is composed of a pair of divided pieces, and these divided pieces hold both ends of the feeding member. Each is maintained independently.

[Embodiments of the invention]

The present invention will be described below with reference to an embodiment shown in FIGS. 10 to 14. Note that the same parts as those shown in FIG. 3 are given the same numbers. 7a in the figure is a pinch roller, and both ends of this pinch row 27a are held by a holding member 25. The holding member 25 is constituted by a pair of links 25&, 25b as divided pieces. Both ends of the pinch roller 7a are connected to the link 25a via bearings 22, respectively.

It is rotatably held on the lower side of 25b.

The links 25m and 25b are rotatably supported by support shafts 26* and 26b, and their upper sides are biased by equal forces P& by springs 20m and 20m as biasing members, respectively. . The pinch row 27a is pressed against the platen roller 5 by the urging force of these springs 2 (ta, 20*).The support shafts 26m, 26b are fixed to a frame (not shown).

On the other hand, locking pieces 27h and 27h formed at both ends of the connecting member 27 are locked to the lower sides of the links 25h and 25b, and a solenoid 8a is connected to the central portion of the connecting member 27.

Thus, when the pinch roller 7a is to be separated from the platen row 25, the solenoid 8&' is energized.

The connection part cedar 27 is attracted to the solenoid 8a side, and the link 25a.

25b rotates counterclockwise against the tension of the springs 20IL and 20a, and the pinch row 27a separates from the platen roller 5.

Further, when the pinch roller 7a is brought into pressure contact with the platen roller 5, the solenoid 8a is demagnetized. Accordingly, the links j 5 a e 25 b each have a spring 20
The pinch roller 8a rotates clockwise due to the biasing force of m and 20h, and the pinch roller 8a comes into pressure contact with the thermal head 5.

As described above, both ends of the pinch row 27a are held independently by the pair of links 25h and 25b, so even if the pinch roller 7a is mounted obliquely to the platen row 25 as shown in FIG. Both ends of the pinch roller 7a can be moved independently, that is, the amount of movement of one end of the pinch roller 7a is small and the amount of movement of the other end is large, as shown in FIGS. 12 to 14. 77a can be brought into uniform pressure contact with the platen row 25 over the entire surface.

Therefore, the paper P that is pinched and conveyed between the platen roller 5 and the pinch row 97a is conveyed by the same distance on both the left and right sides, and even when the paper P is conveyed in the forward and reverse directions, no skew occurs, and the printing position in overlapping printing is prevented. Misalignment is reliably prevented. Note that in the above embodiment, link 2
5a.

Support shafts 26a and 26b of 25b are springs 20a.

Although the supporting shafts 26h and 26b are provided between the point of action of the link 20h and the pinch roller 22, as shown in FIG.

The same effect can be obtained by adjusting the force of 20m. Further, the positions of the springs 20m and 20* may be the positions shown in FIG. 16. With this configuration, the platen'o -:17
The force of the e-inch roller a applied to the spring 5 can be applied with less spring force than in the case of the configuration shown in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to reliably prevent displacement of printing positions during overprinting with a simple configuration.

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[Brief explanation of the drawing]

Figures 1 to 9 show conventional examples, where Figure 1 is a schematic configuration diagram showing a thermal printer, Figure 2 is a side view showing a paper straightening device, and Figure 3 is a holding of the pinch row 2. Figure 4 is a perspective view showing the structure, Figure 4 is a plan view showing the pinch roller attached to the platen roller in an inclined state, Figure 5 is its side view, and Figures 6 to 9 are paper conveyance. Explanatory diagrams showing the state, FIGS. 10 to 14 show one embodiment of the present invention. FIG. 10 is a diagonal view showing the holding structure of the pinch p-2, and FIG. FIG. 12 is a plan view showing a state in which the roller is attached in an inclined state, FIG.
The drawings are a sectional view taken along the line FF in FIG. 12, FIG. 15 is a perspective view showing a first alternative embodiment of the present invention, and FIG. 16 similarly shows a second alternative embodiment. FIG. 5... Platen, 71... Feeding member, (pinch roller), P... Transported object (paper), 25... Holding body,
25*, 25b... Divided piece (link). Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 @ Figure 3 Figure 4 Figure 6 Figure 8

Claims (2)

[Claims] (1) A platen, a feeding member that is movably provided on the 7'2 tension plate and that pinches and conveys the object to be conveyed between the platen and a holder that holds both ends of the feeding member. 1. A conveyance device, characterized in that the holding body is constituted by a pair of divided pieces, and both ends of the feeding member are independently held by these divided pieces. (2) The conveyance according to claim 1, wherein each of the pair of divided pieces is urged by an urging member, and the urging force of these urging members brings the feeding member into pressure contact with the platen. Device.