JP4476340B2 - Paper feeder - Google Patents

Description

  The present invention relates to a paper feeding device, and more particularly to a pinch roller that presses paper against a conveyance roller.

  In a paper feeder such as a printer, a pinch roller (also referred to as a pressure roller) is often used to send out printing paper, for example, rubber, to press the paper against a conveyance roller. In office printers, since there is a relatively large space and printing paper is large, for example, as described in Patent Document 1 (Japanese Utility Model Laid-Open No. 5-46455), the pinch roller has an end. In many cases, the shaft is formed with a shaft and the shaft is pressed by a spring.

  By the way, in recent years, many portable small-sized printers have been used for electricity and gas meter reading, issuance of receipts for in-car sales, ticketing at the time of in-car inspection, and the like. As described above, such a small printer is often used while moving.

  In particular, the occurrence of paper jams is strongly desired because the use of the equipment is interrupted.

Japanese Utility Model Publication No. 5-46455

  An object of the present invention is to solve the above-described problem that the printing paper does not smoothly pass between the conveyance roller 10 and the pinch roller 60 and a paper jam occurs upstream or downstream of the pinch roller 60. To do.

According to invention of Claim 1, it has a conveyance roller and a pinch roller which presses paper to the conveyance roller, and the pinch roller is an upstream side wall which is on the upstream side of the movement direction of the paper formed in the pinch roller casing; A spring formed on the bottom wall of the groove, having a downstream side wall on the downstream side in the paper movement direction and a bottom wall, having an opening on the conveyance roller side, and being received in a groove extending parallel to the axis of the conveyance roller A paper feeding device that is pressed toward the conveying roller by a spring disposed in the receiving hole,
There is provided a paper feeding device in which a film having good slipperiness is attached to a downstream side of a pinch roller on a surface of a pinch roller casing facing a conveying roller.

In such a paper feeding device, the printing paper is guided by a film having good slipperiness that is adhered to the downstream side of the pinch roller on the surface of the pinch roller casing that faces the conveyance roller, and between the conveyance roller and the pinch roller. To pass smoothly.

  According to the second aspect of the present invention, there is further provided a sheet feeding device provided with an inclined plate that approaches the conveying roller as it approaches the pinch roller upstream of the pinch roller on the upper surface of the pinch roller casing.

According to invention of Claim 3, it has a conveyance roller and a pinch roller which presses paper to the conveyance roller, and the pinch roller has an upstream side wall on the upstream side in the moving direction of the paper formed in the pinch roller casing; A spring formed on the bottom wall of the groove, having a downstream side wall on the downstream side in the paper movement direction and a bottom wall, having an opening on the conveyance roller side, and being received in a groove extending parallel to the axis of the conveyance roller A paper feeding device that is pressed toward the conveying roller by a spring disposed in the receiving hole,
There is provided a sheet feeding device characterized in that an inclined plate that is closer to the conveyance roller as it approaches the pinch roller is disposed upstream of the pinch roller on the upper surface of the pinch roller casing.

  In the paper feeding device according to claims 2 and 3, the printing paper is guided by the inclined plate approaching the conveying roller as it approaches the pinch roller disposed on the upstream side of the pinch roller on the upper surface of the pinch roller casing. And between the pinch rollers.

  According to the present invention, the occurrence of paper jam is prevented.

  The invention described in each claim has a simple structure and is not costly, and can be easily applied to conventional products.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, a reference example will be described. FIG. 1 is a diagram showing the structure of the first reference example, and the conveying roller 10 is rotated in the direction of the arrow by a driving means (not shown) such as a motor. A pinch roller casing 20 is disposed opposite to the conveying roller 10, and a groove 30 is formed in the pinch roller casing 20. The groove 30 includes an upstream side wall 31 on the upstream side of the paper movement and an upstream side. It has a downstream side wall 32 facing the side wall and downstream of the paper movement, and a bottom wall 33. The center line of the bottom wall 33 is set to be directly below the axis of the transport roller 10.

  A coil spring receiving hole 40 having a circular cross section is formed near the longitudinal center of the bottom wall 33 of the groove 30, and the coil spring 50 is received in the coil spring receiving hole 40. A pinch roller 60 is disposed on the coil spring 50, and the pinch roller 60 is urged toward the conveyance roller 10 by the coil spring 50 to press the printing paper 100 against the conveyance roller 10. In this embodiment, the printing paper 100 is a thermal paper. The printing paper 100 is printed by the thermal head 70 after about a half turn after passing the portion pressed against the conveying roller 10 by the pinch roller 60.

  As shown in the drawing, the upper end of the coil spring 50 in contact with the pinch roller 60 has an inclined upper end structure in which the upstream side is high and the downstream side is low. Therefore, the pinch roller 60 is always pressed against the downstream side wall 32 and does not move between the upstream side wall 31 and generate abnormal noise.

  Further, as shown in FIG. 2, when viewed from above, the shape of the letter “” is formed, the center line of the letter “” is perpendicular to the longitudinal direction, and the coil spring 50 is at its center. When the pinch roller 60 is pressed and the pressing action is stabilized, the contact area with the pinch roller 60 is reduced.

  Although the coil spring 50 hardly deviates from the installation direction at the time of assembly during use, as shown in FIG. 3, two crescent-shaped protrusions whose inner side is parallel to the bottom surface 41 of the coil spring receiving hole 40. If the center line part of the character of "" formed in the lower end part of the coil spring 50 is arrange | positioned in between, and it forms, 42 is perfect. In FIG. 3, for the sake of clarity, the coil spring receiving hole 40 is cut in half by a plane parallel to the axis, and the right side is cut by a plane perpendicular to the axis so that the structure of the groove 30 can be seen. It is shown.

  Next, a second reference example will be described. FIG. 4 is a diagram showing the configuration of the second reference example. In the second reference example, the groove 30 is offset downstream in addition to the first reference example. By doing so, even if the pinch roller 60 tries to move from the downstream side to the upstream side, it is necessary to compress the coil spring 50 at that time, and the reaction force becomes resistance, so that the pinch roller is more reliably pinched. The roller 60 can be pressed against the downstream side wall 32.

  Although the second reference example can be used alone, if the upper end of the coil spring 50 is opposite to the first reference example, that is, the downstream side is high, the operation becomes unstable. Therefore, it is preferable to keep at least horizontal.

  Further, as conventionally done, if the diameter of the central portion of the pinch roller 60 where the coil spring 50 abuts is reduced and the portion where the printing paper 100 is actually pressed against the transport roller 10 is thickened, the portion where the coil spring 50 abuts. In addition, there is a low possibility that dust or the like of the printing paper 100 will adhere to the coil spring 50, and malfunctions are unlikely to occur.

  Next, an embodiment of the present invention that prevents the occurrence of paper jam will be described. FIG. 5 is a view showing the structure of the embodiment of the present invention in the same manner as in FIG. 1, and is a guide film made of a material having a good sliding property from the upstream upper surface 21 to the downstream upper surface 22 of the pinch roller casing 20. 80A is pasted. In this way, for example, unlike the first and second reference examples, the printing roller 100 and the pinch roller 60 can be smoothly moved even when the printing paper 100 enters from above as illustrated. The paper jam is prevented from being generated in front of it.

  6 is a view seen from the direction of arrow VI in FIG. 5, and FIG. 7 is a view seen from the direction of arrow VII in FIG. As shown in both figures, the pinch roller 60 has a central portion that is smaller in diameter than the outer portion, and the guide film 80 is disposed so as to correspond to the reduced diameter portion and is in contact with the pinch roller 60. Never do.

  Next, a second embodiment will be described. FIG. 8 is a diagram for explaining the features of the second embodiment, except that a guide film 81 that is enlarged to both ends in the axial direction of the pinch roller 60 is used. The enlarged portion extends into the groove 30 along the downstream side wall 32. 9 is a view seen from the direction of arrow IX in FIG. 8, and FIG. 10 is a view seen from the direction of arrow X in FIG. The second embodiment is configured as described above, and the printing paper 100 is guided over a wider range than the third embodiment, and paper jam is more reliably prevented.

  Next, a third embodiment will be described. FIG. 11 is a diagram for explaining the characteristics of the third embodiment, in which an inclined plate 90 is provided on the upper surface upstream of the groove 30 of the pinch roller casing 20 with the upstream side being thin and the downstream side being thick. . The inclined plate 90 may be formed integrally with the pinch roller casing 20, or may be attached or bonded separately formed by an appropriate member. 12 is a view as seen from the direction of arrow XII in FIG. 11, and as shown in FIG. 12, the inclined plate 90 is formed across the width of the groove 30 in the axial direction. The third embodiment is configured as described above, and the printing paper 100 is introduced between the conveying roller 10 and the pinch roller 60 by the inclined plate 90, and the occurrence of paper jam can be prevented.

  Next, a fourth embodiment will be described. FIG. 13 is a diagram for explaining the characteristics of the third embodiment, and in addition to the third embodiment, a film 82 made of a material having good slipperiness is attached to the downstream side of the pinch roller 60. It is. The film 82 is provided over the entire width of the groove 30, and the lower side extends into the groove 30. FIG. 14 is a view seen from the direction of the arrow XIV in FIG. 13, and as shown in FIG. 12, the guide member 90 is formed across the axial width of the groove 30. The third embodiment is configured as described above, and the printing paper 100 is introduced between the conveying roller 10 and the pinch roller 60 by the guide member 90, and the occurrence of paper jam can be prevented.

It is a figure which shows the characteristic of the 1st reference example. It is the figure which removed the conveyance roller from the 1st reference example and was seen from the top. It is a figure which shows how to fix the direction of the coil spring in the modification of a 1st reference example. It is a figure which shows the characteristic of the 2nd reference example. It is a figure which shows the characteristic of 1st Embodiment. It is the figure seen from the direction of VI of FIG. It is the figure seen from the direction of VII of FIG. It is a figure which shows the characteristic of 2nd Embodiment. It is the figure seen from the direction of IX of FIG. It is the figure seen from the direction of X of FIG. It is a figure which shows the characteristic of 3rd Embodiment. It is the figure seen from the direction of XII of FIG. It is a figure which shows the characteristic of 4th Embodiment. It is the figure seen from the direction of XIV of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Conveying roller 20 Pinch roller casing 30 Groove 31 Upstream side wall 32 Downstream side wall 33 Bottom wall 40 Coil spring receiving hole 50 Coil spring 60 Pinch roller 70 Thermal printer 80, 81, 82 Film 90 Inclined plate 100 Printing paper

Claims (3)

It has a conveyance roller and a pinch roller that presses the paper against the conveyance roller, and the pinch roller is on the upstream side wall on the upstream side in the paper movement direction formed on the pinch roller casing and on the downstream side in the paper movement direction A spring having a downstream side wall and a bottom wall, having an opening on the conveying roller side, received in a groove extending parallel to the axis of the conveying roller, and disposed in a spring receiving hole formed in the bottom wall of the groove. A paper feeding device being pressed toward the transport roller,
A sheet feeding device, wherein a film having good slipperiness is attached to a downstream side of a pinch roller on a surface of a pinch roller casing facing a conveying roller.   2. The sheet feeding device according to claim 1, further comprising an inclined plate that approaches the conveying roller as it approaches the pinch roller on the upstream side of the pinch roller on the upper surface of the pinch roller casing. It has a conveyance roller and a pinch roller that presses the paper against the conveyance roller, and the pinch roller is on the upstream side wall on the upstream side in the paper movement direction formed on the pinch roller casing and on the downstream side in the paper movement direction A spring having a downstream side wall and a bottom wall, having an opening on the conveying roller side, received in a groove extending parallel to the axis of the conveying roller, and disposed in a spring receiving hole formed in the bottom wall of the groove. A paper feeding device being pressed toward the transport roller,
A sheet feeding device, wherein an inclined plate that approaches a conveying roller as it approaches the pinch roller is disposed upstream of the pinch roller on the upper surface of the pinch roller casing.

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