JPS6169646A - Splice device - Google Patents

Abstract

PURPOSE:To maintain the nip pressure for transferring of a sheet constant with the use of magnetic attraction force, by forming one of a pair of transfer belts with the use of a magnetized material, and by using a magnetic roll as one of rotating rolls for supporting the other one of the transfer belts. CONSTITUTION:A themotransfer printer 1 is provided with a roll 3 for supplying an ink-donor film 2, a thermal head 4 for heating a dornor film 2 and a platen roll 20 for making a piece-cut sheet 5 into press contact with the thermal head 4 through the intermediary of the ink-donor film 2. Further, transfer devices 9a, 9b for the piece-cut sheet 5 are arranged at both ends of a recording section 6 composed of the opposing parts of the thermal head 4 and the palaten roll 20. In this arrangement, magnet rolls 12a, 12b, 13a, 13b are used in lower belt transfer mechanisms 10b, 11b in the transfer devices 9a, 9b. Further, magnetic belts 21a, 21b are laid in the upper belt transfer mechanism 10a, 11a.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper conveyance device for paper sheets, etc., and in particular, by maintaining the nip pressure during paper conveyance by magnetic attraction force, adjustment of the nip pressure is unnecessary. The present invention relates to a paper conveyance device.

[Conventional technology]

2. Description of the Related Art As a paper conveyance device, for example, there is one that supplies recording paper to a recording section (thermal head) of a thermal transfer color printer at a predetermined timing.

This paper conveying device is composed of a pair of rubber rolls, one of which is a drive roll and the other one is a driven roll. The drive roll and the driven roll face each other with a predetermined nip pressure, and supply the recording paper to the recording section while sandwiching the recording paper between the nip walls. In the recording section of a color printer, color recording is performed by heating a color ink donor film with a thermal head to perform thermal transfer. The color ink donor film regularly has a plurality of areas of different colors that produce full colors by overlapping colors, for example, and the recording paper is supplied to the recording section each time each color is recorded. As described above, in supplying the recording paper, the pair of rubber rolls sandwich the recording paper and supply it to the recording section at a predetermined timing, thereby realizing color recording by overlapping multiple colors without color shift.

[Problem that the invention seeks to solve]

However, according to conventional paper conveying devices, a pair of rubber rolls are opposed to each other with a predetermined nip pressure, so the dimensional accuracy of the outer diameter of the rubber rolls or the accuracy of the mounting position of the axis of the rotating shaft is strict, and the rubber rolls are When the rollers wear out, the nip pressure fluctuates, which may shift the timing of feeding the recording paper and cause color misregistration in color recording.

[Means and operations for solving the problems] The present invention has been made in view of the above, and in order to eliminate the need for adjusting the nip pressure that clamps the recording paper, it is possible to adjust the nip pressure that clamps the recording paper. The present invention provides a paper conveying device that is maintained by a magnetic attraction force acting between a magnetic conveying means and a magnetic belt facing the magnetic belt.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a paper conveyance device according to the present invention will be described in detail based on the attached drawings.

〔Example〕

FIGS. 1 and 2 show an embodiment of a thermal transfer printer 1 using the present invention, including an ink donor film supply roll 3 wound with an ink donor film 2 coated with thermal transferable ink; , a thermal head 4 selectively heats the donor film 2 sent out from the donor film supply roll 3 according to an image signal, and a cut recording paper 5 is pressed into contact with the thermal head 4 via the donor film 2 to perform heat-sensitive processing. A platen roll 20 is provided for recording (the recording unit 6 is constituted by the facing portion of the thermal head 4 and the platen roll 20). Also, between the donor film take-up roll 7 for collecting the used ink donor film 2 that has finished recording, the donor film supply roll 3, and the recording section 6, and between the recording section 6 and the donor film take-up roll 7.
Guide rolls 3a and 8b are provided between the two. Furthermore, a pair of conveyance devices 9a and 9b for conveying the cut recording paper 5 as shown in FIG. 3 are provided at both ends of the recording section 6. The conveying devices 9a, 9b are composed of a pair of upper and lower belt conveying mechanisms 10a, 10b, lla, llb, and the lower belt conveying mechanisms 10b, llb are provided with magnetic holes 12a, 12b as shown in FIG. , 13a,
13t) (combination of metal roll 40 and permanent magnet 41), and its rolls 12a, 12b, 13a.

13b1 is equipped with belts 14a and 14b made of polyester resin or the like. On the other hand, the belt conveying mechanism 102 located above. In the lla, belts 21a, 211) made of magnetic material (for example, a steel belt) are mounted. The conveyance devices 9a and 9b having such a configuration are driven by one drive unit 15 as shown in FIG.

To explain the operation in the above configuration, when performing color printing, for example, when using the ink donor film 2 in which cyan, magenta, and yellow colors are arranged regularly and alternately, first, the cyan portion is , the recording paper 5 is fed rightward to perform thermal recording in the magenta area, secondly the recording paper 5 is sent back to the left to perform thermal recording in the magenta area, and finally in order to perform thermal recording in the yellow area. The recording paper 5 is fed to the right again, thereby printing three colors of cyan, magenta, and yellow (instead of this method, a plurality of recording heads corresponding to the number of colors may be provided). is also good).

When feeding the cut recording paper 5 into the thermal transfer printer 1 in such a color printing operation, the cut recording paper 5 is attached to the bell 21a of the printing device 9a and the magnetic rolls 12a, 12.
The nip pressure is maintained by the magnetic effect of b, and the paper is transported to the recording section 6.

Next, the ink donor film 2 is sent out from the ink donor film supply roll 3, passes through the recording section 6 between the thermal head 4 and the platen roll 5 via the kite roll 8a, and is applied to the recording paper 51. Record in color. The used ink donor film 2 is wound onto a donor film take-up roll 7. On the other hand, when the cut recording paper 5 that has completed the first thermal recording process is nipped by the :, L, :j feeding device 9b, the driving section 15 starts driving in the opposite direction to the initial driving, The conveyance device 9b conveys the cut recording paper 5 in the nip state again toward the recording section 6. At this time, the single-cut recording paper 5 existing between the belt conveyance mechanism 11a and llb of the conveyance device 9b is held and moved by a predetermined nip pressure due to the magnetic effect, so its position does not shift and the same single-cut recording paper 5 is moved. Even if thermal printing of other colors is performed on paper 5, no color shift occurs. After completing the heat-sensitive recording process for a predetermined number of colors, the cut recording paper 5 is transferred again to the belt conveying mechanism 10a, 10b or 1 of the conveying device 9a or 9b.
1a and 11b and is ejected to the ejection tray.

〔Effect of the invention〕

As explained above, according to the paper conveyance device according to the present invention,
Since the nip pressure for sandwiching the recording paper is maintained by the magnetic attraction force acting between the magnetic conveying means and the magnetic belt facing the magnetic conveyance means, there is no need to adjust the nip pressure for sandwiching the recording paper.

[Brief explanation of drawings]

Fig. 1 is a structural explanatory diagram of a paper feeding device according to the present invention;
3 is a perspective view of a paper conveying device according to the present invention, FIG. 3 is a structural explanatory diagram of the conveying device of the present invention, and FIG. 4 is a structural explanatory diagram of a magnet cooler used in the present invention. Explanation of symbols 1...Thermal transfer printer, 5...Slip recording paper, 9a, 9b...Transport device, 10a, 10b, lla, llb...-Bell l transport mechanism, 12a, 12b, 13a, 13b-79-*tsu)
o-/I/, 14a, 14b...belt, 21
a, 2lb...magnetic belt, 40.
...Metal roll, 41...Permanent magnet. 1st U4! Figure 4 I7/Q Figure 3

Claims (1)

[Scope of Claims] A paper conveyance device that sandwiches paper between a pair of conveyance belts and guides it in the conveyance direction, in which one conveyance belt is made of a magnetized material such as iron, and a rotating roll that supports the other conveyance belt. A paper conveying device characterized in that at least one of the magnetic rolls is a magnetic roll, and a nip pressure for paper conveyance is maintained by a magnetic attraction force between the magnetic roll and the one conveyance belt.