JPH0218251A - Recording sheet conveying device - Google Patents

Abstract

PURPOSE:To regulate a distance between engaging pins at both ends according to expansion and contraction of a recording sheet along with a change in the temperature and humidity of the open air and to ensure conveyance by always engaging the engaging pins with the respective perforations of a recording sheet by a method wherein the engaging pin located at the one end part of a sprocket is mounted in a manner to approach and separate from an engaging pin located to the other end part positioned facing the one end part. CONSTITUTION:When during conveyance of a recording sheet 10, a pitch L in the lateral direction of the recording sheet 10 between perforations 11a and 11b is varied, along with variation of the pitch L, a force by which a moving sprocket 2b is moved axially of a rotary shaft 3 is exerted on the one engaging pin 7b engaged with the perforation 11b of the recording sheet 10, and by means of the force exerted on the engaging pin 7b, the moving sprocket 2b is moved axially of the rotary shaft 3. As a result, a distance between an engaging pin 7a of a stationary sprocket 2a and an engaging pin 7b of the moving sprocket 2b is regulated in a manner to match variation of the pitch L between the perforations 11a and 11b, and the engaging pin is always engaged with the perforation to reliably convey the recording sheet 10.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a recording paper conveying device, and in particular, to reliably convey recording paper even when the recording paper expands and contracts due to changes in temperature, humidity, etc. The present invention relates to a recording paper conveyance device capable of

(Prior art) As a conveyance device for recording paper for recording experimental data, etc.
The one shown in the figure is known.

In FIG. 2, the paper conveying device 1 is attached to a rotating shaft 3,
a pair of sprockets 2a that rotate in synchronization with the rotating shaft 3;
2b, and a guide drum 4 sandwiched between the pair of sprockets 2a, 2b and mounted on the rotating shaft 3.

The pair of sprockets 2a, 2b are each fixed to the rotating shaft 3, and engagement pins 7a, 7b are provided on the outer peripheries of the sprockets 2a, 2b, respectively. The engaging pins 7a and 7b are holes 11a formed on both sides of the recording paper 10.

11b to convey the recording paper 10.

The guide drum 4 is also fixed to the rotating shaft 3 and rotates in synchronization with the rotating shaft 3.

In such a recording paper conveying device 1, the recording paper 1 is
0 can be conveyed in the direction of the arrow in FIG.

(Problems to be Solved by the Invention) As described above, the pair of sprockets 2a and 2b of the conventional recording paper transport bag fiffil are fixed to the rotating shaft 3.

However, if the pair of sprockets 2a, 2b are fixed to the rotating shaft 3, problems may occur if the atmospheric temperature or humidity changes.

That is, when the temperature or humidity changes, the recording paper 10 as a whole expands and contracts, and as a result, the recording paper 1
0 lateral pitch between openings 11a and llb (Fig. 2 L)
It also expands and contracts. On the other hand, since the pair of sprockets 2a and 2b are fixed to the rotating shaft 3, the sprocket 2a and 2b
The distance between the engagement pin 7a of the sprocket 2b and the engagement pin 7b of the sprocket 2b is fixed, and the horizontal opening 11a of the recording paper 10
.

This does not match the expanded/contracted pitch L between 11b and 11b.

Therefore, the engaging pins 7a and 7b are connected to the opening 11a of the recording paper 10.
, 11b, and the recording paper 10 cannot be reliably conveyed.

The present invention has been made in consideration of these points, and provides a recording paper transport device that can reliably transport recording paper even when the recording paper expands and contracts due to changes in temperature, humidity, etc. The purpose is to

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a sprocket in which a plurality of engagement pins are provided at both ends of the outer periphery to engage with apertures formed in both ends of a recording sheet, and the engagement pins are The paper conveying device is characterized in that each engagement pin provided at one end of the sprocket is capable of moving toward and away from the engagement pin provided at the corresponding other end. be.

(Function) According to the present invention, the engagement pin provided at one end of the sprocket can be freely moved into and out of contact with the engagement pin provided at the other end of the sprocket. During conveyance, the distance between these corresponding engagement pins is adjusted by: A according to the expansion and contraction of the pitch between the openings in the lateral direction of the recording paper.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a recording paper conveying device according to the present invention. In FIG. 1, a recording paper conveyance device 1 includes a pair of sprockets 2a and 2b mounted on a rotating shaft 3, and this pair of sprockets 2a.

A guide drum 4 mounted on the rotating shaft 3 and sandwiched between the guide drums 2b and 2b.
It is equipped with

Of these, the rotating shaft 3 has a cross-sectional shape, and insertion holes each having a shape corresponding to the cross-sectional shape of the rotating shaft 3 are formed inside the pair of sprockets 2a, 2b and the guide drum 4. There is. Therefore, the pair of sprockets 2a, 2b and the guide drum 4 are configured to rotate in synchronization with the rotating shaft 3.

Also, on the outer periphery of the pair of sprockets 2a and 2b, holes 11a are formed on both sides of the recording paper 10.

an engagement pin 7a that engages with 11b and conveys the recording paper 10;
7b are provided respectively.

Furthermore, one of the pair of sprockets 2a, 2b,
For example, sprocket 2a (hereinafter referred to as fixed sprocket) is
A set screw 5 prevents the rotating shaft 3 from moving in the axial direction.

Note that the insertion hole of the other sprocket 2b (hereinafter referred to as a movable sprocket) has a slightly larger cross-sectional shape than the rotating shaft 3, so that the sprocket 2b can move along the axial direction of the rotating shaft 3. It looks like this. Further, the inner surface of the insertion hole of the movable sprocket 2b and the corresponding outer surface of the rotating shaft 3 are subjected to low friction treatment, so that the movable sprocket 2b can move smoothly along the axial direction of the rotating shaft 3.

Further, a bushing 8 is fixed to the end of the rotary shaft 3 on the side of the movable sprocket 2b to prevent the movable sprocket 2b from being removed. Therefore, the movable sprocket 2b can be smoothly moved between the guide drum 4 and the bush 8.

Next, the operation of this embodiment having such a configuration will be explained.

First, the fixed sprocket 2a is rotated by rotating the rotating shaft 3 by a drive device (not shown).

and the engagement pin 7a of the movable sprocket 2b.

7b engages with the apertures 11a and llb of the recording paper 10 to transport the recording paper 10.

During transportation, if the atmospheric temperature or humidity becomes low, the recording paper 1
0 lateral pitch between openings 11a and llb (Fig. 1 L)
expands and contracts. In this case, the openings 1 in the horizontal direction of the recording paper 10.
As the pitch L between la and llb expands and contracts, the recording paper 1
A force that moves the movable sprocket 2b in the axial direction of the rotating shaft 3 acts on the engagement pin 7b through the opening 11b. At the same time, the engaging pin 7 is inserted through the opening 11b of the recording paper 10.
The movable sprocket 2b moves in the axial direction of the rotary shaft 3 by the force acting on the rotary shaft 3.

As described above, according to this embodiment, the distance between the engagement pin 7a of the fixed sprocket 2a and the engagement pin 7b of the movable sprocket 2b is such that the distance between the engagement pin 7a of the fixed sprocket 2a and the engagement pin 7b of the movable sprocket 2b is equal to
Since the engagement pins 7a and 7b are adjusted to match the expansion and contraction of the pitch L between b, the engagement pins 7a and 7b engage with the openings 11a and llb of the recording paper 10, and the recording paper 10 can be reliably conveyed.

In the above embodiment, an example was shown in which the movable sprocket 2b was moved in the axial direction of the rotating shaft 3 by the force acting on the engagement 7b of the movable sprocket 2b from the aperture 11b of the recording paper 10. Only the pin 7b may be moved. In this case, if the sprocket 2b is fixed to the rotating shaft 3, a groove is provided on the outer periphery of the sprocket 2b along the axial direction of the rotating shaft 3, and the engaging pin 7b is provided movably within this groove. Only the engagement pin 7b can be moved relative to the sprocket 2b.

(Effects of the Invention) As explained above, according to the present invention, the distance between the engagement pin provided at one end of the sprocket and the engagement pin provided at the corresponding other end of the recording paper is It can be adjusted to match the expansion and contraction of the lateral aperture pitch.

Therefore, even if the recording paper expands or contracts due to changes in temperature or humidity while the recording paper is being conveyed, the engagement pins of the sprocket can engage with the apertures in the recording paper, thereby ensuring that the recording paper can be transported to

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a recording paper conveyance device according to the present invention, and FIG. 2 is a perspective view showing a conventional recording paper conveyance device. DESCRIPTION OF SYMBOLS 1... Recording paper conveyance device, 2a... Fixed sprocket, 2b... Movable sprocket, 3... Rotating shaft, 4...
・Guide drum, 5, 6... Set screw, 7a, 7b・
...Engagement pin, 10...Recording paper, lla, llb...
・Open hole. Figure 1

Claims (1)

[Claims] A sprocket is provided at both ends of the outer periphery with a plurality of engaging pins that engage with openings formed at both ends of the recording paper, and each of the engaging pins is provided at one end of the sprocket. A recording paper conveyance device characterized in that the dowel pin is capable of moving toward and away from an engagement pin provided at the corresponding other end.