JPS6111173Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll paper support shaft that can reliably position, guide, and wind up two types of roll paper with different paper widths used in the same device.

For example, a roll paper winding shaft for winding printed continuous paper or the like is generally provided with two flanges to prevent the paper from meandering and to reliably wind it.
In this case, if both flanges are fixed, the operability will be significantly hindered, so one flange is made removable.

In such a roll paper winding shaft, when two types of roll paper having different paper widths are used, it is necessary to move the attachment/detachment flange according to the paper width. Therefore, conventionally, a shaft to which a fixed flange is fixed is provided with two detachable flange engagement grooves according to the paper width, and the detachable flange is engaged and fixed in each of the engagement grooves to be mounted.

However, in this case, when using narrow roll paper, the removable flange can be positioned by locking it to the stepped part of the shaft, but when using wide roll paper, the removable flange cannot be positioned because the shaft does not have a stepped part for locking the removable flange. It was difficult to position.

This invention is intended to solve the above problems.
It is an object of the present invention to provide a roll paper winding shaft that can easily and reliably position a detachable flange according to the width of the paper.

Embodiments of the invention will now be described with reference to the drawings.

Fig. 1 is a front view of a roll paper winding shaft according to the present invention assembled for wide paper, and Fig. 2 is an exploded perspective view of the same essential parts. In the figure, 1 is a fixed flange, 2 is a shaft, and 3 is a bush. , 4 is a detachable flange.

A fixed flange 1 is fixed to one end of the shaft 2.

The shaft 2 has a cylindrical shape, and an engagement groove 5 is formed in the circumferential direction in the middle part, and a flat part 6 is formed in the part from the engagement groove 5 to the other end as shown in detail in FIG. , 6' are provided. As shown in FIG. 4, the engagement groove 5 is provided with planar locking portions 7, 7' formed by cutting off the bottom 5a of the groove. The flat parts 6, 6' and the flat locking parts 7, 7' are provided symmetrically with respect to the axis of the shaft 2 and perpendicular to each other, and the distance A between the flat locking parts 7, 7' is 6 and 6' by an appropriate amount. In addition, at the other end of the shaft 2, there is a hole 8 concentric with the shaft 2, as shown in FIG.
The ring-shaped portion 9 outside the hole 8 is provided with four grooves (engaging portions) of the same width 10, 11, 10', 1
1' are formed parallel to the axis of the shaft 2 at equal intervals. The grooves 10 and 10' are respectively flat parts 6 and 10'.
6' forming part.

As shown in detail in FIGS. 2 and 6, the bush 3 is formed by engaging four notches 12 parallel to the axis of a material having the same cross-sectional shape as the plane portions 6, 6' of the shaft 2. Engagement groove 13 having the same shape as groove 5
and. There is a knob 1 on the end of the bush 3.
4 are integrally provided. Protrusions (engaging parts) 15, 15' formed by providing the notches 12
The projections (engaging portions) 16, 16' are shaped to fit into the grooves 10, 10', 11, 11', respectively, and the distance between the outer surfaces of the projections 15, 15' is B. As shown in FIG. 7, the engagement groove 13 has a planar locking portion 1 perpendicular to the outer surface of the projections 15, 15'.
7, 17' are provided. Planar locking part 1
7 and 17' are formed symmetrically with respect to the axis of the bush 3 with a distance A between them. As shown in detail in FIG. 8, this bushing 3 is screwed (fixing means ) 30 to the shaft 2.
At this time, the engagement groove 13 is in a position where it does not come off the end surface of the shaft 2.

The attachment/detachment flange 4 is formed by providing a hole 18 and slits 19, 19' in a disk-shaped material having a thickness that fits into the engagement groove 13, as shown in FIG. The hole 18 is sized to fit into the flat parts 6, 6' of the shaft 2, and is provided at the center of the detachable flange 4, and the distance B' between its parallel edges is slightly larger than B. It's summery. The slits 19, 19' are provided symmetrically and parallel to the center of the detachable flange 4, and elastic members (engaging members) 20, 20' are formed between the slits 19, 19' and the hole 18. There is.

This attachment/detachment flange 4 is attached to the shaft 2 by fitting it into the bush 3 as shown by the arrow in FIG. 8, and rotating it 90 degrees when it comes into contact with the end surface of the shaft 2. In this case, when the attachment/detachment flange 4 rotates four times, the elastic members 20, 20' rotate while being elastically deformed, and when the attachment/detachment flange 4 rotates 90 degrees, the elastic members 20, 20' form a planar shape with a spacing of A. The attachment/detachment flange 4 is fixed by being engaged with the engagement portions 17, 17', and at this time, the projections 16, 16'
serves to position the attachment/detachment flange 4.
Therefore, the attachment/detachment flange can be attached easily and reliably.

The roll paper winding shaft assembled in this way guides wide paper, but when guiding narrow paper, it is assembled using the following procedure.

In other words, from the above-mentioned assembled state, once the bush 3
Remove the detachable flange 4 and attach the bush 3 to the shaft 2 with the bush 3 rotated 90 degrees from the above case as shown in Figure 4. Fit it into the bushing 3 as shown. In this case, the attachment/detachment flange 4 enters into the engagement groove 5 forming portion. When the detachable flange 4 is rotated here, the rotation progresses while the elastic members 20, 20' are elastically deformed in the same way as described above.
When the detachable flange 4 is rotated 90 degrees, the elastic members 20, 20' are engaged with the planar locking portions 7, 7' provided at a distance A, and the detachable flange 4 is fixed.

The roll paper winding shaft assembled in this way guides the narrow roll set.

As described above, according to the present invention, it is possible to easily and reliably position the attachment/detachment flange according to the paper width.

[Brief explanation of the drawing]

The drawings show an embodiment of the roll paper winding support shaft according to the present invention. FIG. 1 is a front view showing the assembled state for guiding wide paper, FIG. 2 is an exploded perspective view of the same essential parts, and FIG. The figure is a sectional view of the flat part forming part of the shaft, Fig. 4 is a sectional view of the engagement groove provided in the shaft, Fig. 5 is a sectional view of the shaft end, and Fig. 6 is a sectional view of the notch forming part of the bush. Figure 7 is a sectional view of the engagement groove provided in the bushing, Figure 8 is an assembly procedure diagram when using wide paper, and Figure 9 is an assembly procedure diagram when using narrow paper. is a fixed flange, 2 is a shaft, 3 is a bushing, 4 is a detachable flange, 5,
13 is an engaging groove, 10, 10', 11, 11' are grooves (engaging parts), 6, 6' are flat parts, 7, 7', 17, 1
7' is a planar locking part, 8, 18 are holes, 15, 1
5', 16, 16' are protrusions (engaging parts), 19, 1
9' is a slit, 20 and 20' are elastic members (engaging members), and 30 is a screw (fixing means).

Claims (1)

[Scope of utility model registration request] It consists of a shaft with a fixing flange fixed to one end, a bush, fixing means for fixing the bush to the shaft, and a detachable flange, and the shaft has an engaging groove in its middle part and an engaging part in its end. and a flat part parallel to the axis between the engaging groove and the end, and the bush has the engaging groove formed in a material having the same cross-sectional shape as the flat part forming part of the shaft. an engagement groove having the same shape as the engagement groove, and a position where the bush engages with the engagement portion when the bush is fixed to the shaft so that their flat parts are flush with each other, and a position where the bush is rotated by a predetermined angle from the position. and an engaging part for positioning the
The attachment/detachment flange includes a disc-shaped material having a width that fits into each of the engagement grooves, a hole that fits into the plane portion forming portion of the shaft, and the attachment/detachment flange to fit into each of the engagement grooves. an engagement member that engages with the engagement groove to fix the detachable flange when rotated by a predetermined angle; A roll paper support shaft, characterized in that it is formed at a position adjacent to an end surface of the shaft.