JP2501980Y2 - Paper transport device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device for correcting skew of a sheet being conveyed.

2. Description of the Related Art In devices such as various printers, print quality and the like are impaired when skew or meandering occurs in a sheet to be transported, and thus a sheet transport device for preventing this has been put into practical use. Therefore, as a conventional example of such a sheet conveying device, an actual development of Sho 63
The device disclosed in Japanese Patent Publication No. 190239 will be described with reference to FIG. First, in this paper transporting device 1, a pair of skew rollers 4 are axially supported in an inclined state on a paper transport path 3 formed by guide plates 2 facing each other. A paper guide 5 is provided in the direction. The paper guide 5 has a structure in which the through groove 7 of the side guide 6 continuous with the guide plate 2 is shielded from the outside by a flat plate-shaped end face guide 8, and the end face guide 8 has abrasion resistance. It is made of a material having a good friction coefficient and is attached to the side guide 6 with a bolt 9.

With such a configuration, in the paper transporting apparatus 1,
The sheet (not shown) conveyed in the sheet conveying path 3 is deflected in the conveying direction by the skew roller 4 to the oblique side and goes into the sheet guide 5. Therefore, the side edge portion of the sheet inserted into the through groove 7 of the sheet guide 5 is guided by the side surface guide 6 and pressed against the end face guide 8, whereby the direction of the sheet is corrected.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The above-described sheet conveying apparatus 1 is configured to easily correct the direction of a sheet by pressing the sheet of which the conveying direction is deflected by the skew roller 4 against the sheet guide 5. . here,
Since the end face guide 8 that slides by pressing the side edge portion of the paper needs to be replaced due to wear, the end face guide 8 is detachably attached to the side face guide 6 with the bolt 9 in the above-described paper conveying device 1. .

However, this requires a tool for exchanging the end face guides 8 and the work is complicated, which is not preferable.

Further, in the above-described sheet conveying device 1, the side edge portion of the sheet inserted into the through groove 7 of the sheet guide 5 may be pressed against the boundary portion between the end face guide 8 and the side surface guide 6 due to the pressing force. In this case, in this case, the boundary portion inevitably has a large frictional resistance, so that conveyance failure or damage of the sheet occurs.

According to another aspect of the invention, a skew roller for deflecting a sheet conveying direction to an oblique side is axially supported on a sheet conveying path in an inclined state, and the skew roller is deflected to a conveying direction. An elongated guide member is formed on the side of the sheet conveyance path in the conveyance direction in which opposing concave grooves are formed and engaging portions projecting inward are formed on both edges of the concave groove. A sheet-like sliding member was inserted into the groove in a curved state and elastically held between the engaging portions.

According to the second aspect of the present invention, the engaging portion that comes into contact with the end surface of the guide member is formed at the end portion of the sliding member on the upstream side in the sheet conveying direction.

According to the first aspect of the present invention, since the sliding member is elastically held in a curved state in substantially the entire groove of the paper guide into which the side edge of the paper is inserted, the side edge of the paper is different from the sliding member. The slipping member elastically held in the guide member can be easily replaced without being locked in the gap between the member and causing the conveyance failure or damage to the paper.

According to the second aspect of the present invention, since the engaging portion that abuts against the end surface of the guide member is formed at the end portion of the sliding member on the upstream side in the paper transport direction, the sliding member can slip in the guide member together with the paper. To be prevented.

Embodiment An embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above-mentioned conventional example are denoted by the same names and reference numerals, and description thereof will be omitted. First, this paper transport device
In 10, a sheet guide 13 is formed by an elongated guide member 11 and a sheet-like sliding member 12, as illustrated in FIG. 1 (c). Here, as illustrated in FIG.
The guide member 11 is formed with a recessed groove 15 having rib-shaped engaging portions 14 projecting inward at both edges and at a position continuous with the sheet conveying path 3, and the sliding member 12 is formed in the sheet conveying direction. A T-shaped locking portion 16 is formed at the upstream end of the. And
As illustrated in FIGS. 1A to 1C, the sliding member
12 is inserted into the concave groove 15 in a curved state, and the locking portion 16
Is in contact with the end surface of the guide member 11 and the engaging portion
Elastically held between 14

In such a configuration, in this paper transport device 10,
As illustrated in FIG. 2, when the conveyed sheet 17 is guided by the skew roller 4 into the groove 15 of the sheet guide 13, the sheet 17 is pressed by the sliding member 12 in the groove 15. 17 directions corrected. At this time, in this paper conveyance device 10, since the sliding member 12 is arranged in a curved state in substantially the entire groove 15 of the paper guide 13 into which the side edge of the paper 17 is inserted,
There is no possibility that the side edge portion of 17 is locked in the gap between the sliding member 12 and another member and the paper sheet 17 is not conveyed or damaged. Moreover, in this paper transporting device 10, since the sliding member 12 is only elastically held in the guide member 11, it can be easily replaced without using a tool. Further, in this paper transporting device 10, the locking of the locking portion 16 prevents the sliding member 12 from slipping in the guide member 11 together with the paper 17, and the locking portion 16 is used when the sliding member 12 is replaced. It can be used as a handle for.

Here, the stress acting on the sliding member 12 and the like of the sheet conveying device 10 will be described. First, when the conveying force F ₁ acting on the sheet 17 is deflected by the skew roller 4 from the original conveying direction to the diagonal side, the conveying force F ₁ is applied to the sheet 17 as illustrated in FIG. 3B. _As a component force of ₁ , a force F ₂ that conveys the sheet 17 in the original conveying direction and a force F ₃ that presses the sheet 17 against the sheet guide 13 act. Therefore, the frictional force acting on the sheet 17 is the pressing force F ₃ multiplied by the coefficient of friction with the sheet guide 13. If the frictional force is excessive, the paper 17 will rotate so as to trip over the paper guide 13 as illustrated in FIG. 3 (a), so that the sliding member 12 has a small friction coefficient. It is made of a material such as polyester or fluorinated ethylene. In particular, polyester has good abrasion resistance and can be easily mass-produced in a film form. The influence of the friction coefficient of the sliding member 12 of the paper guide 13 on the conveyance of the paper 17 is, as illustrated in FIG. Space L between paper guide 13, point of action P and paper
It can be represented by the distance S from the front edge of 17. For example,
The state in which conveyance failure occurs on the paper 17 was S / L = 0.7 to 0.8 when the sliding member 12 of the paper guide 13 was made of iron, and S / L = 0.3 to 0.4 when it was made of polyester. .

Advantageous Effects of Invention The invention according to claim 1 is configured such that a skew roller for deflecting a sheet conveying direction to an oblique side is axially supported on a sheet conveying path in an inclined state, and a concave groove facing the conveying direction deflected by the skew roller is provided. Is formed and the engaging portions projecting inwardly are formed on both edges of the concave groove.A slender guide member is arranged laterally of the sheet conveying path in the conveying direction, and the sheet is placed in the concave groove of the guide member. -Shaped sliding member is inserted in a curved state and elastically held between the engaging portions, so that the sliding member is arranged in a curved state in substantially the entire groove of the paper guide into which the side edge of the sheet is inserted. So
The side edge portion of the sheet does not lock in the gap between the sliding member and another member to prevent the sheet from being defectively conveyed or damaged, and the sliding member elastically held in the guide member requires a tool. It is possible to easily replace the sheet, and to obtain a sheet transporting device that can reliably correct the direction of the sheet and has good maintainability.

According to the second aspect of the present invention, since the engaging portion that abuts against the end surface of the guide member is formed at the end portion of the sliding member on the upstream side in the paper transport direction, the sliding member can slip in the guide member together with the paper. As a result, it is possible to obtain a practical sheet conveying device with stable performance.

[Brief description of drawings]

FIG. 1 is an assembly process diagram showing an embodiment of the present invention, FIG. 2 is a vertical sectional front view, FIG. 3 is a plan view showing a stress state, and FIG. 4 is a vertical sectional front view showing a conventional example. 3 ... Paper transport path, 4 ... Skew roller, 10 ... Paper transport device, 11 ... Guide member, 12 ... Sliding member, 14 ... Engaging portion, 15 ... Recessed groove, 16 ... Engagement Stop, 17 ... Paper

Claims (2)

(57) [Scope of utility model registration request] 1. A skew roller, which is axially supported on a sheet conveying path in an inclined state and deflects a sheet conveying direction to an oblique side, and a skew roller which is disposed on a side of the sheet conveying path and is deflected. A long and narrow guide member in the conveying direction in which a concave groove facing the conveying direction is formed and engaging portions projecting inwardly are formed at both edges of the concave groove, and a curved shape in the concave groove of the guide member. A sheet conveying device comprising a sheet-shaped sliding member that is inserted in a state and elastically held between the engaging portions. 2. The sheet conveying apparatus according to claim 1, wherein an engaging portion for contacting an end surface of the guide member is formed at an end portion of the sliding member on the upstream side in the sheet conveying direction.