JPS58129874A - Sheet carrying device - Google Patents

Abstract

PURPOSE:To cope with different sheet width with one kind of roll member without giving any effect on the driving source, by forming the roll member with a driving roll and a free rotation roll in response to the state of inside or outside of a minimum sheet area. CONSTITUTION:A recording paper 13 being a sheet is recorded and carried with a recording head 11 being a non-rotation fixed member and a back roller 12 being a roll member in contact with the head 11 opposingly. Taking the minimum area of the recording paper as WA and the other area as WB, the roll 12 is formed with a driving roll 14 having a length of WA in addition to the size P and a free rotation roll 15 positioned in WB. The roll 14 is fixed to a shaft 16 and rotated by the driving source. The roll 15 is fixed to a tube member 17 freely inserted to the shaft 16 and the thrust positioning is performed by a roll retainer 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet conveying device in a facsimile machine and a copying machine IK.

Conventionally, for example, when looking at the conveyance mechanism of the recording unit in a facsimile machine, as shown in Fig. 1, a step motor (1) is used.
A recording paper (6) fed by a feeding lawn (5) having a pulley (4) connected to a pulley (2) of the belt (3) by a belt (3) is brought into opposing contact with a multi-stylus recording head (7). It is conveyed by a back roller (8), and a pulley (9) of the back roller (8) is connected to a pulley (4)K by a belt. Here, record paper (
6) Sizes include A width size WA and B width size w
If it is for A width size WA, back row 2 (8mm) and B width size w as shown in Figure 2 (-).
If it is for l, the back roller (8) is shown in the same figure (J).
In order to use B), the parts are changed during assembly. Here, the back roller (8A) (8a) is made of foam rubber, and its length is usually wA + 2P%.
wB + 2P (however, 2 to 3 m in P).

Here, the back roller for A width size, KB width when WA is used (
8B) cannot be used because the length P that protrudes from the recording paper (6) increases as shown in Figure 3, and the contact between this back roller (8B) and the recording head (7) increases accordingly. This is because the area increases. In other words, since the frictional resistance between the rubber back roller (8B) and the recording head (7) is large, as the contact area between them increases, the step motor (1)
) load increases. In particular, since the back roller (8) also has the purpose of pressing the recording paper (6) against the recording head (7), this load is large. If the recording paper (6) is interposed between the tab, the recording head (7) and the back row 2 (8), the friction coefficient between this recording paper (6) and the recording head (7) is small, so the protrusion dimension It is better to make P as small as possible, and it is set to 2 to 35 mm in consideration of skew forces.

Therefore, in order not to increase the load on the step motor (1), the back roller (8A) (8
11) If... were to be used, multiple types of back rollers would have to be provided and regular replacement work would be required.
This is troublesome for the operator, and it is difficult to quickly adapt to the desired paper width.

The present invention has been made in view of the above points, and an object of the present invention is to provide a sheet conveying device that can handle different sheet widths with one type of roller member without affecting the drive source. That is.

In the present invention, by forming the roller member with a drive roller and a free rotation roller according to the inside and outside of the minimum sheet area, only the drive roller rotates when the minimum sheet is available, and the free rotation is in contact with a non-rotation fixed member. The roller does not rotate, but if the sheet is larger than the smallest sheet, the free rotating roller also rotates as the sheet is conveyed.

An embodiment of the present invention will be described based on FIGS. 4 and 5. This embodiment is applied as a conveying device for a recording unit in a facsimile machine.Basically, as shown in FIG. According to (6), the recording paper is conveyed while being recorded on the recording paper as a sheet.

Here, to simplify the explanation, the recording paper (total) is A size, B size? Two types of sizes are selected and used, and A size is the minimum, and this A size area is wA.
The area of %B size is indicated by Wa. Therefore, the back roller (6) is located at both ends of the drive roller a41 and the drive row 9α◆, which has a length equal to the dimension P in this A size area WA, that is, outside the A size area WA and B
The free rotating roller (2) located within the size area wB is made of rubber, and both ends (2) are made of rubber to ensure conveying force. That is, the drive roller (L4a) is fixed to the metal shaft (2) and rotated by a drive source (not shown).On the other hand, the drive roller (L4a) is fixed to the metal shaft (2) and rotated by a drive source (not shown).
Do not fix the pipe QiK loosely fitted into the roller presser (
2) Positioning in the cis-last direction is performed. This roller presser (to) is fixed to the shaft o4 with a set screw (2), but it may be fixed with an E ring instead of these. In addition to this, the free rotating roller (2)
is independent from the drive source and is rotatable with respect to the shaft (2) (although the shaft (2) li!
(6j) may be rotatable only in the opposite direction to the paper feeding direction by a means such as providing a one-way spring clutch, and such rotatable devices are also included).

With this configuration, A size recording paper (up to)
Let's consider the case of recording and transporting. This recording paper (2) is conveyed by a drive roller α◆ rotated by a sheet 'r7 (B) based on a drive source. At this time, the free rotating roller is located outside the recording paper (2) and directly contacts the recording head q. However, since it is separated from the drive roller α→ and rotates independently from the drive source, only the shaft (B) rotates, but the outside (the rotating roller) does not rotate, and the recording head (B) and A fixed contact state is established. Therefore, even if the contact area between the recording head (a) and the rotating roller (g) is large and the friction thereof is large, it will not impose a load on the drive source when both are stopped. In this way, the conveyance of the A-size recording paper is carried out satisfactorily only by the drive roller α→ corresponding to the size.

On the other hand, consider a case where B-size recording paper (total) is conveyed for recording. In this case, the recording paper (2) extends over the entire length of the back roller (6), that is, not only the drive roller 2α◆ but also the free rotating roller), and its conveyance is carried out by the drive roller cL4 that rotates based on the drive source. It is done well. During this operation, the recording head α and the rotating roller (2
Since there is a recording paper in a moving state between ), the rotating roller ( ) pressed against the recording head CLC rotates as a result of the movement of the recording paper. Therefore, if it is B size, it will not be conveyed by the entire back roller (2), causing any skew. Especially when the recording head mill is a stylus head, etc.
) is effective when the entire surface is required to be pushed.

After all, according to this embodiment, in order to convey recording sheets of different sizes such as A and B sizes, the driving roller α◆
It is only necessary to use one type of back roller (6) consisting of a 7-rotation roller and a 7-rotation roller (6), so there is no need to replace it for each size, and the size is also suitable for the drive source. Therefore, there is no need to apply an excessive load, and the number of driving sources can be minimized.

In this embodiment, it is possible to cope with this problem by making the 7-wheel rotation rollers multi-stage, such as by providing free rotation rollers for two types of A and B sizes. Furthermore, in the case of a one-side-based conveyance system, it goes without saying that the free rotation roller (2) may be provided only on one end side of the drive row 2 (B).

Furthermore, the conveyance device of the present invention is applicable not only to a facsimile recording paper conveyance device but also to various sheet conveyance devices. For example, as shown in Figure 6, contact glass (
e) The document (2) above is illuminated with a lamp 4 and an image is formed on the light receiving element (c) through a lens system.The rear roller 4 is applied to the feed roller in the facsimile reading section. It is. In this case, the contact glass 4 becomes a non-rotating fixed member. In addition, the present invention can also be applied to a sheet conveyance device in a copying machine, and the sheet is not limited to paper.

Furthermore, if the entire surface of the sheet is not required to be crimped, both the drive roller and the free rotation roller may be split rows 2 divided in the axial direction.

In the present invention, as described above, the row 2 member that faces and contacts the non-rotating fixed member is formed by a drive roller and a free rotating roller depending on whether it is inside or outside the minimum sheet area, so that regardless of the size of the sheet, Moreover, it is possible to carry out satisfactory conveyance using only one type of row 2 member without increasing the load on the drive source. □

[Brief explanation of drawings]

Figure 1 is a schematic side view showing a conventional example, Figure 2 (α) (4)
3 is a front view showing an enlarged part of the same, FIG. 4 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 5 is a vertical cross-sectional view of the same. , FIG. 6 is a schematic side view showing a different application example. 11... Recording head (non-rotating fixed member), 12...
Back roller (roller member), 13... Recording paper (sheet), 14... Drive roller, 15... 7-turning roller, 20... Contact glass (non-rotating fixed member),
21...Manuscript (sheet) Applicant: Ricoh Co., Ltd.

Claims (1)

[Claims] A row 2 member is provided that conveys the sheet by opposingly contacting a non-rotating fixed member such as a recording head, and this roller member is located within the minimum sheet area and is rotated by a drive source, and a drive roller is located outside this minimum sheet area. A sheet conveying device characterized in that it is formed of a freely rotating roller independent from a drive source and a K.