JPS60204560A - Device for braking feed of belt material - Google Patents

Abstract

PURPOSE:To prevent a band material from loosening or meandering, by bringing a brake roller into contact with the peripheral surface of the belt material wound as a roll, so that a frictional turning force inverse to the direction of sending-out of the belt material is applied thereto by the brake roller. CONSTITUTION:A belt 21 is wound on a pulley 20 for a brake roller 19 and a pulley 18 on a fixed shaft 13 distant from a tab material feed shaft 11 in a printer. A frictional turning force inverse to the direction of rotation of a tab material 10 is applied thereto by the brake roller 19 synchronously with the sending-out of the tab material. At the same time, a braking force corresponding to the change in the weight of the tab material 10 is applied thereto by a swing mechanism for the feed shaft 11 in response to the change in the diameter of the roll of the tab material so that the material is prevented from meandering, loosening or the like at the halfway fed portion thereof.

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to a braking device for a supply shaft of a belt-shaped member such as a rolled label, tag, or thermal transfer carbon ribbon, and particularly relates to a braking device for a supply shaft of a belt-shaped member such as a rolled label, tag, or thermal transfer carbon ribbon. This is a supply brake device for a strip member that applies a reverse friction rotational force to a rolled strip continuous body.

(Prior Art) A conventional brake device of this type will be explained with reference to FIGS. 1 to 3.

Figures 1 and 2v! The one shown in J is configured to apply a brake to the supply shaft of the belt-shaped member l via a nut 3, a spring 4, and a spacer 5, and the belt-shaped member 1 being fed out via a guide roller 6 is braked. However, it is difficult to always obtain a braking force or pushing force that corresponds to the change in condition with respect to the change in diameter (change in weight). Therefore, when selecting the spring 4, consideration should be given to the change in the diameter of the strip member l. There is a difficult problem that requires

The one shown in FIG. 3 is constructed so that a guide roller 8 is biased against the roll-shaped strip member l by a spring 7 in the opposite direction to the supply direction, but even with this mechanism, the tensile force of the guide roller 8 is There is a problem in that the intermittent movement of the roll-shaped strip member 1 cannot be fully responded to, and slack may occur.

In this way, in conventional devices of this kind, only a roller is provided that applies a brake to the axis of the rolled strip member or simply reversely biases it, so it is difficult to prevent intermittent movements or weight changes (diameter changes) of the strip member. Since a constant braking force cannot be obtained according to the amount of pressure, the belt-like member may loosen or meander, which causes extremely serious problems in terms of print quality when used in printers and the like.

The present invention has been made in view of these problems, and provides a belt-shaped member that can apply a constant braking force to the supply shaft of the roll-shaped belt-shaped member regardless of changes in its state (change in weight, change in diameter). The purpose is to provide a supply brake device.

(Summary of the Invention) That is, the present invention swingably supports the supply shaft of a roll-shaped strip member, brings a brake roller into contact with the outer circumferential surface of the strip member, and uses the brake roller to control the feed direction of the strip member. This is a supply brake device for a belt-shaped member that applies a friction rotational force in the opposite direction to the roll diameter and in accordance with the roll diameter.

(Embodiment) Next, a case where an embodiment of the present invention is adopted as a tag supply shaft in a printer 13 will be described with reference to FIGS. 4 and 5.

The supply shaft 11 of the tag lO is supported by the support frame 12 and fixed shaft 1
It is said to be able to swing freely around 3 as an axis point.

A bell) 14 is wound between a pulley 15 of the supply shaft 11 and a pulley 16 of the shaft 13. Furthermore, the machine frame 1 of the fixed shaft 13
Pulley 2 of pulley 18 and brake roller 19 separated by 7
0, a belt 21 is wound around it. The support lever 22 of this brake roller 19 is connected to the machine frame 1 by a beam 23.
It is fixed at 7.

A pair of beams 24 and 25 are provided on the support frame 12, and a support plate 26 is further attached. A tension spring 27 is attached between the machine frame 17 and the support beam 25. Incidentally, reference numeral 28 is a guide roller for the tag I that has been drawn out.

Next, the effect will be explained.

In FIG. 4, the pulling force of the tag lO supplied in the direction A becomes a rotational driving force of the supply shaft 11 holding the tag 10, and rotates the pulleys 16 and 18 via the belt 14. The rotational force is further transmitted to the brake roller 19 via the belt 21.
is transmitted to.

Therefore, the supply shaft 11 and the tag lO as well as the belt 14.2
The rotational direction of the tag 1 is as shown by the arrow in Figure 4, and the brake roller 19 rotates in the opposite direction to the rotational direction of the rolled tag 10, and applies a rotational friction force in the opposite direction to the roll outer peripheral surface of the tag 10. do.

Here, when the rolled tag 10 has a large diameter, its weight is large and the resistance from the brake roller 19 is large. On the other hand, as the tag 10 is unrolled, the roll diameter of the tag 10 decreases, and the resistance applied by the brake roller 19 decreases.

Therefore, in synchronization with the feeding and feeding of the tag 10, the rotational friction force in the opposite direction to the rotational direction of the tag 10 is applied to the brake roller 19.
At the same time, the oscillating pendulum mechanism of the supply shaft 11 (in the directions of arrows B and C) corresponding to changes in the roll diameter generates a braking force in accordance with the change in weight (and diameter change) of the tag. It is possible to prevent slack or meandering during supply, thereby improving the printing quality of a printer or the like.

In this embodiment, a tag is used as the belt-shaped member, but the present invention can be applied to any belt-shaped member such as a label thermal transfer carbon ribbon to make the tension uniform.

In addition, although a case has been described in which a belt is used as the means for connecting to the brake roller or as the means for transmitting the rotational force of the rolled tag, it is also possible to use a means for transmitting the rotational force such as a chain or a gear.Furthermore, the spring 21 may be a compression spring, Any tension spring can be used.

(Effects of the Invention) As described above, according to the present invention, the rotational frictional force that is always synchronized with the movement of the belt-like member wound into a roll can be transmitted to the surface of the belt-like member, thereby preventing the belt-like member from loosening and meandering during transportation. Stable transfer becomes possible.

[Brief explanation of drawings]

FIG. 1 is a front explanatory view of the prior art, FIG. 2 is a side view of the same, FIG. 3 is a front explanatory view of the other side of the prior art, and FIG. 4 is a front explanatory view of an embodiment of the present invention. Figure 5 is a bottom view of the same. Explanation of symbols i--Band-like member 1o-Fist tag 1111-Supply shaft 1311-Fixed shaft 14.21-
・・Belt 15.16, 18.20---Pulley 19.0・Brake roller 27・・Fist spring patent applicant Sato Raku Co., Ltd. Figure 1 Figure 3

Claims (1)

[Claims] When transferring a rolled strip member from a supply shaft to a take-up shaft, a support member rotatably supports the supply shaft, a brake roller that comes into contact with the outer periphery of the rolled strip member, and this brake roller. A supply brake device for a belt-shaped member, characterized in that a connecting means is provided for connecting the supply shaft to apply a braking force in the opposite direction to the roll of the belt-shaped member.