JPS60155483A - Printer - Google Patents

Abstract

PURPOSE:To securely prevent an ink sheet from being wrinkled, by a method wherein a tension roller making contact with an ink sheet is continuously energized to rotate in a direction opposite to the feeding direction of the ink sheet, in a thermal transfer type printer. CONSTITUTION:An ink sheet 24 is clamped between a platen roller 12 and a recording head 14 together with a paper 16 to perform thermal transfer, and is intermittently fed from a payout part 20 to a take-up part 30. In a tensioning mechanism part 50, the tension roller 52 is continuously energized to rotate in the direction opposite to the feeding direction of the ink sheet 24 by an ordinary motor 56 through a belt 54, thereby imparting a required tension to the ink sheet 24, and a surplus rotation of the motor 56 is relieved by slipping of a rotor. Accordingly, sag of the ink sheet 24 due to the inertia of an inke roller 22 is immediately absorbed, and the ink sheet 24 is securely prevented from being wrinkled between the platen roller 12 and the recording head 14.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to printers, particularly those used in facsimile machines and printing devices, and relates to printers that perform recording using ink sheets, such as thermal transfer printers. For example, a thermal transfer printer includes a recording section that performs recording by sandwiching an ink sheet and a printing head between a platen roller and a recording head and selectively transferring ink from the ink sheet to the paper; It is composed of an ink supply section that feeds the sheet from a roll and supplies it to the recording section, and an ink winding section that intermittently winds up the ink sheet that has passed the recording section using a step motor or the like, and, for example, Characters and the like are printed or recorded on the paper.

By the way, in this type of printer, in order to prevent wrinkles from forming on the ink sheet, it is necessary to give an appropriate amount of tension to the ink sheet so that the ink sheet does not become loose. For this reason, in conventional printers of this type, a brake is applied, for example, to the outer periphery of the ink roll or its axis.

However, in the conventional printer as described above, especially when the printing operation is increased in speed, the ink roll does not stop immediately when the intermittent drive stops instantaneously due to its inertia, but rotates slightly due to inertia. When such inertial rotation occurs, the platen and the recording sheet come into contact with each other, causing slack in the sheet.Furthermore, this slack is not absorbed and creates wrinkles, which causes problems in the recorded image. It has been found that defects called "streaks" and "missing" occur during the time 1 m't-.Purpose This invention is to solve the above-mentioned time t1M, and its purpose is to This makes it possible to reliably prevent the occurrence of wrinkles on the ink sheet, especially at the pressure contact area between the platen roller and the recording hub, thereby producing high-quality transferred images free of defects such as "streaks" and "missing spots." Our goal is to provide a printer that allows you to obtain

Configuration The printer according to the present invention has a recording section that performs recording by holding an ink sheet and paper between a platen roller and a recording head and selectively transferring ink from the ink sheet to the paper; an ink supply section that feeds the ink sheet from the roll and supplies it to the recording section;
In a printer equipped with an ink winding section that intermittently winds up the ink sheet that has passed through the recording section, an ink winding section that applies tension to the ink sheet between the ink supply section and the recording section is provided. In addition to installing 111 parts of the machine,
The tension winding mechanism is characterized in that the tension winding mechanism is constituted by a tension winding roller that contacts the ink sheet, and a motor that urges the tension winding roller to continuously rotate in a direction opposite to the conveying direction of the ink sheet. - Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

Note that the same or corresponding parts in the figures are indicated by the same reference numerals.

FIG. 1 shows an embodiment of the printer according to the present invention. The printer shown in the figure is used as a facsimile recording device, for example, and selectively heats and transfers ink from an ink sheet 24 to paper 16. The printer shown in FIG. 1 includes a recording section 10, an ink supply section 20. Ink winding section 30
．． The recording SLO is composed of a platen roller 12, a heated recording head 14, and a spring mechanism 18 that presses the recording head 14 against the platen roller 12 side. be done.

A sheet of paper 16 and an ink sheet 24 are sandwiched between the platen roller 12 and the recording head 14 under pressure.The ink supply section 20 has an ink roll 22 formed by winding an unused ink sheet 24. , this ink roll 22t-
The ink winding unit 30 includes a winding roll 32 on which the used ink sheet is wound after passing through the recording unit 10, and a shaft U that holds this winding roll 32. , a dry plate cutter, a transmission belt 38, a winding motor that rotates in steps, a guide roller 42, a pulley 44, etc. - Axis U and belt 38
A dry plate clutch is interposed between the two. Further, the guide roller 42 is provided with a clutch 43 so that the guide roller 42 rotates only in the winding direction of the ink sheet 24.

The tension mechanism section 50 is composed of a tension roller 52 that presses against the ink sheet 24, a belt 54, a tension tension motor 56, a pulley ring, a tension tension spring ω, and the like. 24C is held between the platen roller 12 and the recording head 14 along with the paper 16, and the recording head 14 selectively heats and transfers ink from the ink sheet U to the paper 16, thereby printing the paper 16. ni character or II! ii images, etc. are recorded. At this time, the ink sheet 24 is carried out stepwise for each transfer cycle and is intermittently conveyed from the supply section 20 to the winding Its 30.

Step drive at this time! +11 is performed by the winding plate motor rotation of the winding section 30. The take-up motor 40 is a step motor that moves the shaft 34 of the take-up roll 32 seven steps m through a transmission bell 38 and a dry plate clutch 36. Shikaku motor 5
6 is a normal continuous rotation type AC motor, and - is a DC motor. Then, the tension roller 52 is continuously urged to rotate from the motor 56 via the belt 54 in the direction in which the ink sheet 24 is conveyed, that is, in the direction opposite to the direction in which the ink roll 22 is fed out. At this time, the driving voltage or driving current of the motor 56 is set so that the acid motor 56 can apply the necessary tension to the ink sheet 24. At this time, the excessive rotation valve of the motor 56 is released by the slippage of the rotor of this motor group.

The tension torque applied by the tension roller 52 is set to be smaller than the winding torque at the winding section 3o.

As described above, the slack caused by the inertia of the ink roll 22 is immediately absorbed by the tension roller 52, which is continuously urged to rotate, thereby causing the ink to flow between the platen roller 12 and the recording head 14. This ensures that wrinkles are prevented. Therefore, even when a printing operation is performed at high speed, it is possible to obtain a recorded image of good quality, with defects such as "streaks" and "drops" smoothed out.

FIG. 2 shows a further preferred embodiment of the printer according to the invention.

In addition to the configuration described above, the printer shown in the figure temporarily feeds a certain amount of ink sheets 14 by temporarily dividing the ink sheet holding state in the recording section 10 by S every time the recording operation for one sheet is completed. That's how it is. The recording section 10 is provided with a head release crank mechanism 70 for retracting the recording head 14 from the platen roller 12. This mechanism 70 is configured to operate using, for example, an electromagnetic solenoid as a driving source. Then, for example, the recording head 14 is temporarily released from the platen roller 12 by operating in synchronization with a signal to discharge the printed paper. Then, the gripping state of the ink sheet 24 is released, and the ink sheet 24 is fed several centimeters by the take-up motor 40, and during this feeding,
The looseness between the recording section 10 and the winding section 30 is removed. In other words, the tension state of the sheet 8 is initialized.In the above manner, the recording unit 1
The looseness of the ink sheet 24 between the ink sheet 24 and the winding section 30 can be reliably absorbed, thereby making it possible to obtain even better quality recorded images. The one-way clutch 43 is provided to prevent the ink sheet from becoming loose and wrinkled due to an increase in the backlash island of the dry plate clutch as the diameter of the take-up roll 32 increases.

Effects As described above, the printer according to the present invention can reliably prevent wrinkles on the ink sheet, especially at the pressure contact area between the platen roller and the recording head, thereby preventing defects such as "streaks" and "dropouts." You can obtain high-quality transferred images.

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of the invention, and FIG. 2 shows a second embodiment of the invention. lO... Recording section 12... Platen roller 14.
・Record Urad 16 ・Paper 18 ・Spring Iso W
It 20... Ink supply section 22... Ink roll 24... Ink sheet 26... Shaft 30... Ink winding section U... Shaft Concave... Dry plate clutch A.
...Transmission belt 40 winding motor Low...Guide roller 43...One-way clutch 44...Pulley connection...Tensile opening mechanism section 52...Tension roller 54...Belt 56. ...Tension motor 58
...Pulley 60...Spring 70...Recording head release crank mechanism Applicant's agent Kiyoshi Torii

Claims (2)

[Claims] (1) A recording unit that performs recording by holding an ink sheet and paper between a platen roller and a recording head and selectively transferring ink from the ink sheet to the paper; and a recording unit that feeds the ink sheet from the roll. In the printer, the printer includes an ink supply section that supplies the ink to the recording section, and an ink winding section that intermittently winds up the ink sheet that has passed through the recording section. A tension tension mechanism section is provided for applying tension to the ink sheet, and the tension tension mechanism section includes a tension roller that contacts the ink sheet, and a tension roller that is arranged in a direction opposite to the conveying direction of the ink sheet. 1. A printer comprising: a motor that continuously rotates in a direction; (2) The holding state of the ink sheet in the recording section is 1
The print link according to claim 1, characterized in that it is temporarily released every time the recording operation for one sheet is completed to idle feed a certain amount of ink sheets.