JPS624913A - Square rotating shaft - 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 and Summary of the Invention) The present invention relates to a rectangular rotating shaft,
It can be used as a rotating shaft for the paper feeding mechanism.

Further, this invention aims at reducing weight by making the square rotating shaft entirely hollow double pipe, and also allows the arc portions formed at the corners to be set small.

As shown in Fig. 6, the paper feeding mechanism of the Grinter Hou consists of a drive shaft (1) that rotates intermittently and a pair of feeding wheels +10+, flO+7, which are coupled to the drive shaft (1), and the protrusions tll+, +111 provided on these feeding wheels. The paper is caused to travel intermittently by engaging the feed holes provided at both ends of the paper.

Conventionally, the shaft (1) of this body is made of a solid square rod, and by inserting this drive shaft into the square shaft hole provided in the feed wheels fIO+ and +10+, the forward pairing of the two is maintained. .

This advance pair allows the feed wheel (10
), the interval of flO+ can be set.

However, in this case, since the driving OJ shaft (1) is a solid rod, the inertia force during high-speed intermittent rotation becomes large.
This becomes an obstacle to high-speed printing.

To solve this problem, it is conceivable to make the drive shaft (1) a square pipe to reduce the weight of the drive shaft.

Square pipes are often manufactured by processing round pipes by roll forming, and the corner thickness of square pipes manufactured in this way is inevitably determined by the wall thickness that makes up the pipe.

However, since the drive shaft (1) described above is required to have sufficient strength, it is required to have sufficient wall thickness, and if it is a square pipe that exhibits a specified strength, the corners of the pipe as shown in Figure 7. Since the arc is large, looseness is likely to occur at the joint between the feed wheel (10) and the drive shaft (1).

This is because the arc of the corner portion becomes larger, so when a square cross section of a certain size is made, the number of flat areas will be reduced by one portion.

(Technical Problem) The present invention provides a rectangular rotating shaft that is machined from a round pipe and has a rectangular cross section, which has sufficient strength and is capable of preventing rattling at the mating joint. Therefore, the technical problem is to make the arc of the corner part smaller.

(Means) The technical means of the present invention taken to solve the above technical problem consists of a square outer layer pipe (2) and an inner layer pipe (3) inscribed therein.
), the corner portions of both are made to coincide, and the arc of the corner portion of the inner layer tube (3) is set to be larger than that of the entire outer layer tube.

(See Figure 1) (effect) The above technical means of the present invention operates as follows.

Since the strength of the rotating shaft is borne by both the outer layer tube (2) and the inner layer tube (3), the wall thickness of the outer layer tube (3) is as follows.

It can be made thinner than those with a single layer structure. Therefore,
The arc of the corner portion of the outer layer tube (2) is smaller than that of a single layer structure.

In addition, since the inner layer pipe (3) is inscribed in the outer layer pipe (2) and the arc of the corner part is set to be large, a substantially triangular part is formed in the cross section of the corner part, which is the fifth rotation axis. In this case, the strength of the corner portion is also greater than that of a single-layer structure, and the strength can be set to be large under the condition that the total amount of materials used is the same.

(Effects) Since the present invention has the above configuration, it has a first-order unique effect.

Since the circular arc of the corner portion is small, when a rectangular rotating shaft is used, the accuracy of fitting with the mating feed wheel (10) etc. is improved and no rattling occurs.

Since the shaft is twisted and hollow, the inertia during intermittent rotation is reduced, resulting in droplets during high-speed intermittent rotation.

Furthermore, since a triangular cross-sectional structure is formed at the corner portion, the strength of the entire rotating shaft is increased. In other words, when compared with a rectangular pipe with a single-layer structure having the same cross-sectional area, the strength is improved compared to that of a single-layer structure.

(Embodiment) The embodiment shown in FIG. 2 has grooves (4) for attaching a stopper shaft at both ends of a square vibrator with a double structure of constant dimensions.

(4).

In this case, as shown in Fig. 3, the outer layer pipes (2) (4
) is formed, and when the retaining ring is fitted into this groove, a sufficient retaining depth can be obtained.

In addition, in the part where this groove part (4) is completely formed, the outer layer pipe (
Even if the corner portion c21) of 2) is cut off as described above, the strength near the groove portion (4) is sufficient because the inner layer tube (3) is press-fitted.

The square pipe described above can be manufactured by a roll processing device as shown in Fig. 4, and this processing device consists of a pair of vertical rolls ff1ll and ff1l+ and a pair of horizontal rolls (521
, (52+) are made in succession, and two round pipes with a predetermined diameter ratio are fed concentrically into these roll sets +51 and +51, as shown in Fig. 1. A square pipe with a double structure with an eel cross section can be manufactured.

In the case of this example, the round pipe (
30) is 8 mm in diameter, the diameter of the round pipe (20) corresponding to the outer layer pipe (2) is 101 + ll++, and the thickness of each of the two is 0.5 mm. By the roll forming described above, the − side became a square pipe with 8 squares, and the radius of the corner part (21) of the outer layer pipe (2) and the corner part (31) of the inner layer pipe (3) was about 2.5 mm.

In addition, if a single-layer square vibrator with 8 sides and a wall thickness of 1 m (-0.5 mm x 2) is manufactured by the same roll forming method as above, the minimum radius of the corner part is 1.5 mm. ~ About 2 drops.

In addition, as one of the manufacturing methods for round pipes, is there a manufacturing method that gradually bends it into a circular cross section by full roll forming of 6M band, and then welds the joint FjII to finish it into a round pipe? It is also possible to combine the manufacturing method and the square pipe manufacturing method described above. In this method, as shown in Fig. 5, a round pipe corresponding to the outer layer pipe (2) is manufactured using the above-mentioned round pipe processing device (6), and the starting material for the inner layer pipe (3) is used in the semi-finished state of this round pipe. It is sufficient to insert the pipe into the round pipe [20+' and send both to the square pipe processing device (5) at the same time.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the friction of the present invention, Fig. 2 is a detailed explanatory diagram of the invention, Fig. 3 is a sectional view taken along line XX, Fig. 4 is an explanatory diagram of the manufacturing method of this embodiment, and Fig. 5 is an explanatory diagram of the manufacturing method of this embodiment. The figure is an explanatory FJI diagram of another manufacturing method, and Figures 6 and 7 are explanatory diagrams of conventional examples. 3)・・・Inner layer pipe (31)・・・Corner department agent Patent attorney Yoshihiro Sakagami

Claims (1)

[Claims] In a rectangular rotating shaft machined from a round pipe to have a rectangular cross section, a rectangular outer layer tube (2) and an inner layer tube (3) inscribed therein are combined, the corners of both are aligned, and the inner layer tube (3) A rectangular rotating shaft whose corner arc is set larger than that of the outer layer pipe.