JP2863516B2 - Structure of mounting shaft for roll paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the structure of a mounting shaft for mounting roll paper used in a printing press on a printing press or the like.

[0002]

2. Description of the Related Art A roll paper for printing has a structure in which paper is wound around a cylindrical shaft, and a mounting shaft having a roll receiver with a flange fixed to the other is inserted into a hole of a core.
With the roll receiver and the roll paper in contact with each other, a flanged roll receiver is mounted on the other of the mounting shafts, and then a thumbscrew is screwed in from the other end of the threaded shaft to tighten and fix. Has been adopted.

[0003]

However, in such a conventional system, it is difficult to apply force because the roll receiver itself is manually tightened with a thumb screw. Conversely, if too much force is applied, the thumb screw will be damaged, which may hinder the work. In addition, even when the roll receiver is properly tightened, the thumb screw may be loosened due to vibration or the like when the mounting shaft rotates together with the roll paper, and the roll paper may slide in the axial direction. The disadvantage that the printing position is shifted due to the loosening of the thumb screw is also expected. For this reason, there has been a demand for a structure of a mounting shaft that is easy to mount on the shaft and that does not loosen the mounted roll paper. SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described drawbacks of the related art, and has as its object to provide a structure that can be easily mounted and does not easily loosen.

[0004]

That is, according to the present invention, a roll paper mounting shaft having a flanged roll receiver fixed at one end has a diameter smaller than a diameter of a hole of the roll paper fixed to the other end of the shaft. A cylindrical presser core having an outer periphery threaded in different directions and in different directions via a central step portion, a threaded roll receiver with a flange screwed with a large-diameter threaded portion of the presser core, and This object is attained by the structure of the mounting shaft in the roll paper, comprising a loosening prevention screw configured to be screwed with the small-diameter threaded portion and to be in contact with the flanged threaded roll receiver. The invention according to claim 2 is that, as means for securely tightening the threaded roll receiver, grooves having a rectangular cross section are formed at equal intervals in the outer peripheral portion of the flange of the threaded roll receiver, and the shape of the groove is the same as the tip. The continuous portion is fastened and fixed by a torque wrench formed in a substantially semicircular arc having the same diameter as the outer periphery of the flange.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. In FIG. 1, reference numeral 1 denotes a shaft according to an embodiment of the present invention. The shaft 1 is provided with a step portion whose both ends are tapered, and each step portion is provided for fixing vertically to an axis surface. Holes 3, 3 are drilled. As shown in FIG. 1, one end (left side) of the shaft 1 has a cylindrical portion 2a having substantially the same diameter as the inner diameter of the hole of the roll paper 20 and a flange portion (a hole of the roll paper 20) connected to the cylindrical portion 2a. 2b, which is larger than the inner diameter of the left roll receiver 2b. The fixing method is
A screw is inserted through a hole 4 pierced from the side surface of the left roll receiver 2 toward the shaft, and fixed by screwing into the hole 3 of the shaft 1. The cylindrical portion 2a of the left roll receiver 2 is formed in a tapered shape whose diameter is reduced toward the tip as shown in the figure. Reference numeral 5 denotes a guide fixed to an end portion of the left roll receiver 2 and a screw hole 5a of the guide 5 is fixed by screwing a screw into the hole 3 of the small diameter portion of the shaft 1 (FIG. 4). ). Reference numeral 6 denotes a bearing fixed to the end of the shaft 1 to allow the shaft 1 to rotate without resistance. Reference numeral 7 denotes a snap ring for preventing the bearing 6 from coming off.

Reference numeral 8 denotes a cylindrical presser core fixed to the right side of the shaft 1. In this embodiment, the presser core 8 has a large-diameter threaded portion 8a and a small-diameter threaded portion 8b via a central step. The large-diameter threaded portion 8a and the small-diameter threaded portion 8b are formed so that the threading directions are opposite. In this embodiment, the large-diameter threaded portion is clockwise, and the small-diameter threaded portion is threaded at the same pitch so as to be counterclockwise. The presser core 8 has a hole 8c drilled from the center small-diameter portion side surface toward the center, and is fixed by being screwed into a hole provided on the shaft 1 with a cross screw inserted from the hole 8c. Reference numeral 10 denotes a guide formed to have a smaller diameter than the presser core 8, and is screwed to the shaft 1 by a screw as described above. 11 is a bearing, 9 is a snap ring.

Reference numeral 12 denotes a cylindrical roll receiver having a flange portion 12b. The roll receiver is threaded clockwise to be screwed with the large-diameter threaded portion. Rectangular grooves (notches) 13 are formed in the outer peripheral portion of the portion 12 at predetermined intervals (every 90 °). As shown in FIGS. 3 and 6, the cylindrical portion 12a of the roll receiver 12 is formed in a tapered shape whose diameter decreases toward the tip. Reference numeral 14 denotes a loosening prevention screw whose inner periphery is threaded counterclockwise so as to be screwed with the small diameter portion of the presser core 8, and in this embodiment, an inner peripheral side surface is provided so that the prevention screw 14 and the roll receiver come into contact with each other. Has a hollow portion 14a that is slightly larger in diameter than the large diameter portion of the presser core 8.

In the structure described above, in the shaft mounting structure according to the embodiment of the present invention, the left roll receiver 2 with handle and the guide 5 are fixed to the left side of the shaft 1 shown in FIG. Bearing 6 and snap ring 7
Attach. On the right side of the other shaft 1, a right roll receiving presser core 8 and a guide 10 are fitted and then screwed, and a bearing 11 and a snap ring 9 are attached and fixed.

Thereafter, the presser core 8 is inserted into the hole of the cylindrical roll paper 20 from the presser core 8 side, and the cylindrical portion 8a of the left roll receiver 8 with the handle is fitted into the hole of the roll paper 20. Next, while inserting and inserting the cylindrical portion 12a of the roll receiver 12 having a flanged portion 12b and having a threaded inner wall, and rotating to engage with the large-diameter threaded portion 8a of the presser core 8, the cylinder of the roll receiver 12 is rotated. The part 12a is inserted into the hole of the roll paper 20 and fastened and fixed. In this embodiment, since the cylindrical portions 2a and 12a of the two roll receivers 2 and 12 are formed in a tapered shape such that the diameter thereof decreases toward the center of the shaft, the roll receiver 12 is rotated (screwed) to rotate the roll receiver 12. The paper 20 is held between the two roll receivers 2 and 12. Roll receiver 1
In the present embodiment, the rectangular groove 13 provided in the flange portion 12b of the roll receiver 12 has the same shape as that of the groove 13 as shown in FIG. Then, a continuous portion thereof is securely tightened and fixed by using a torque wrench 16 formed in a substantially semicircular arc having the same diameter as the outer periphery of the flange.

After the right roll receiver 12 is fixed, the loosening prevention screw 14 is inserted from the right end side of the shaft 1 and, after the insertion, is screwed into the small-diameter threaded portion 8b of the presser core 8 (in the direction opposite to the roll receiver 12). ), While tightening the prevention screw 14 until it comes into contact with the roll receiver 12.

As described above, the loosening prevention screw 14 is attached to a printing machine or the like in a state of being in contact with the roll receiver 12. When the printing press is driven, the roll paper 20 rotates together with the inner rings of the bearings 6 and 11 because the leading end of the paper is drawn. At this time, because the roll paper 20 is slightly eccentric, the right roll receiver 12 screwed to vibrate tends to rotate in a loosening direction. However, the loosening prevention screw 14 in contact with the roll receiver 12
However, since the screw is rotated in the opposite direction to the roll receiver 12, the rotation in the loosening direction acts as the rotation in the tightening direction of the prevention screw 14.
Is prevented from rotating in the loosening direction.
There is no danger that 0 may be lost. In the present embodiment, the pitch of the threading of the roll receiver 12 and the threading of the loosening prevention screw 14 are configured to be equal, but the present invention is not limited to this. 12 and large diameter threaded portion 8a
When the rotation of the roll receiver 12 in the loosening direction is transmitted to the rotation of the prevention screw 14, the roll receiver 12 is strongly rotated in the tightening direction. It will be strong.

[0012]

As described above, in the structure of the mounting shaft of the roll paper according to the present invention, the fixing of the roll paper to the shaft is not by a thumb screw but by thread cutting, as compared with the conventional roll paper mounting structure. Since it is composed of the roll receiver and the loosening prevention screw threaded in the opposite direction, the roll receiver does not loosen after being mounted on the printing press. Further, in the case of a method in which the roll receiver is mounted via a torque wrench, the roll receiver can be securely screwed, so that it is more difficult to loosen.

[Brief description of the drawings]

FIG. 1 is a developed front view showing an embodiment of a mounting shaft according to the present invention.

FIG. 2 is a front view of a shaft.

FIG. 3 is a front view and a side view of a left roll receiver.

FIG. 4 is a front view and a side view of the guide.

FIG. 5 is a front view of a presser core.

FIG. 6 is a front view and a side view of the right roll receiver.

FIG. 7 is a front view and a side view of a loosening prevention screw.

FIG. 8 is a front view of the torque wrench.

[Explanation of symbols]

 1 shaft 2 left roll receiver 3 hole 4 hole 5,10 guide 6,11 bearing 8 presser core 7,9 snap ring 12 cylindrical roll receiver 13 groove 14 loosening prevention screw 16 torque wrench 20 roll paper

Claims (3)

(57) [Claims] In a roll paper mounting shaft having a flanged roll receiver fixed at one end, the diameter is smaller than the diameter of a hole of a roll paper fixed to the other end of the shaft, and the outer periphery is provided via a central step portion. A cylindrical presser core having a different diameter and threaded in a different direction; a threaded roll receiver with a flange screwed with a large-diameter threaded portion of the presser core; and a small-diameter threaded portion of the presser core screwed into the presser core. A mounting shaft structure for roll paper, comprising: a loosening prevention screw configured to abut a flanged threaded roll receiver. 2. A groove having a rectangular cross section is formed at equal intervals on an outer peripheral portion of the threaded roll receiving flange, and a continuous semi-circular arc having the same shape as the shape of the groove and a leading end and a continuous portion having the same diameter as the outer periphery of the flange. 2. The structure of the mounting shaft of the roll paper according to claim 1, wherein the mounting shaft is configured to be rotated by the formed torque wrench. 3. A thread cutting provided on an outer periphery of the presser core,
3. The structure of the mounting shaft according to claim 1, wherein the pitch of the small-diameter threaded portion is larger than the pitch of the large-diameter threaded portion.