JPS60202051A - Properly delivering device of band like member - 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 (Field of Application of the Invention) The present invention relates to a device for properly feeding out a strip member such as a printing medium in a printer or the like, and in particular, to a device for properly feeding out a strip member such as a printing medium in a printer, etc. Regarding the feeding device 6.

(Prior art) Conventionally, in this type of belt-shaped member feeding device, when the belt-shaped member is wound and held in a roll around a feeding shaft and the roll diameter is large, the tension applied to the band-shaped member is relatively small. However, when the diameter of the roll decreases as it is fed out, the tension on the strip member becomes large, and the tension is not stabilized.In printers, etc., slippage of the strip member at the printing area occurs on the transfer path that includes the printing area. The meandering of borrowed parts.

There were problems such as the generation of scratches, which caused major problems in printing and transportation.

(Object of the Invention) The present invention has been made in view of these problems, and it provides a belt-shaped member in which the resistance force to the feeding shaft of the belt-shaped member can be made variable in response to changes in the roll diameter accompanying the feeding of the band-shaped member. The purpose of the present invention is to provide a device for properly feeding out members.

(Summary of the Invention) That is, the present invention is a device for properly feeding out a band-like member, which detects the roll diameter of the band-like member, and uses this detection signal to vary the resistance force to the feeding shaft, thereby making it possible to keep the feeding tension constant. be.

(Example) Next, an example of the present invention will be described with reference to a thermal transfer carbon ribbon (hereinafter simply referred to as "ribbon A") for a thermal transfer type thermal printer.
An example of application to a feeding device will be explained.

As shown in FIG. 1, a ribbon 1 wound into a roll is held on a payout shaft 2, and the fed ribbon 1 is taken up on a take-up shaft 5 via a guide roller 3.4. A motor 6 is quickly connected to the winding shaft 5 as a drive source.

The ribbon 1 is held between the platen 7 and the thermal head 8 along with the label 9 during transportation, and printing is performed according to a predetermined printing signal. (Note that the label 9 supplying/winding mechanism is omitted.) A diameter detection lever lO, which is rotatably biased in the direction of the feeding shaft 2, is in contact with the outer periphery of the ribbon l. This diameter detection lever 10 is connected to a detector 11 that electrically detects a change in diameter of the ribbon l in accordance with the roll diameter of the ribbon l, as shown in FIG. The output signal output from this detector 11 is input to an electromagnetic clutch 13 via an amplifier 12. This electromagnetic clutch 13 is connected to the feeding shaft 2, and the resistance force applied to the feeding shaft 2 can be made variable by changing its rotational torque.

Next, the effect will be explained.

With the printing operation, the ribbon l is fed from the feeding shaft 2 to the print head 8, and as it is fed out, the roll diameter of the ribbon l gradually becomes smaller. When the roll diameter of the ribbon 1 is large, the electromagnetic clutch 13 applies a relatively large resistance to the feeding shaft 2 based on a signal from the detector 11. When the roll diameter becomes smaller as the ribbon 1 is fed out, the detector 1
1 changes the torque of the electromagnetic clutch 13, and the resistance to the feeding shaft 2 is made relatively small.

Therefore, regardless of the size of the roll diameter of the ribbon L, the tension on the ribbon L can be made constant, and meandering or wrinkling due to changes in tension can be prevented during transport. It is also possible to prevent the ribbon l from slipping at the 7 portion.

In this embodiment, an example in which the present invention is applied to a thermal transfer type thermal printer has been described, but the present invention can also be applied to any printer. In addition, it can be employed to properly feed out any belt-shaped member, such as not only a particularly thin thermal transfer carbon ribbon but also a roll of label paper.

Furthermore, if the electromagnetic clutch 13 is replaced with a motor (not shown) as a resistance means, a pack tensioner can be applied to the feeding shaft 2 in accordance with the roll diameter, and if the belt-like member becomes slack during feeding of the belt-like member in a stepwise manner, Alternatively, it is also possible to pull back the slack by pulling the member in the opposite direction to the feeding direction, thereby stabilizing the tension.

(Effects of the Invention) As described above, according to the present invention, the tension applied to a particularly thin strip member such as a thermal transfer carbon ribbon is made constant, thereby preventing slippage, meandering, and wrinkles of the strip member on the transfer path. , appropriate print quality can be expected.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the main parts thereof. Explanation of symbols l...Ribbon 2...Feeding shaft 3.4...Guide roller 5...Take-up shaft 6...Motor 7...Platen No. 8/Thermal head 9...Label 10・Medium diameter detection lever 11φ Temple detector 12・・Amplifier 13・φ
Electromagnetic clutch patent applicant SATO Co., Ltd.

Claims (1)

[Claims] diameter detection means for measuring the outer diameter of a band-shaped member wound and held in a roll around a feed-out shaft; resistance means capable of varying the resistance force to the feed-out shaft based on a detection signal output from the diameter detection means; and a feeding means for feeding out the band-like member from a feeding shaft.