JP2502889Y2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a paper feeding device attached to a printer or the like for use.

2. Description of the Related Art In general, a paper feeding device includes (a) a pair of feed rollers that feed paper in cooperation with each other, (b) a biasing unit that presses one of the pair of feed rollers to the other, and (c) A separating device that separates the one feed roller from the other feed roller against the urging force of the urging means.

For example, in the apparatus shown in FIG. 3, a feed roller 74 is rotatably attached to a tip end of an arm 72 rotatable about a shaft 70 by a support shaft 73. A base end portion of the arm 72 is fixed to a movable member 76, and one end of the movable member 76 is connected to a tension coil spring 78 as a biasing means. Further, in the vicinity of the feed roller 74, a feed roller 82 that is rotatable integrally with the rotating shaft 80 is provided. Therefore, the feed roller 74 is pressed against the feed roller 82 by the biasing force of the tension coil spring 78, and both feed rollers 74, 82
The sheet is sandwiched between them, and the sheet is fed by the rotation of the feed roller 82 and the rotation of the feed roller 74 accordingly.

A solenoid 84, which is a separating device, is provided below the movable member 76, and a plunger 86 is fitted therein.
The other end of the movable member 76 is connected to the plunger 86,
When the solenoid 84 is excited, the plunger 86 becomes a solenoid.
By being drawn into 84, the movable member 76 is moved against the biasing force of the tension coil spring 78. Therefore, the arm 72 rotates clockwise in FIG. 3,
The feed roller 74 is separated from the feed roller 82.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above apparatus, the shaft 70, the arm 72, the movable member 76, the plunger 86, and the like are provided, so that the number of parts of the paper feeding device increases. Therefore, there is a problem that the structure of the device becomes complicated, the size of the device becomes large, and the cost becomes high.

In view of this problem, the present invention has an object to obtain a paper feeding device having a small number of parts and a simple structure.

MEANS FOR SOLVING THE PROBLEMS Then, the gist of the present invention is to provide one of a pair of feed rollers in a paper feeding device including the (a) pair of feed rollers, (b) urging means and (c) a spacing device. It is made of a magnetic material, and the separating device is constituted by a solenoid that faces the outer peripheral surface of the one feed roller from the side opposite to the other feed roller and that attracts the one feed roller itself.

In the paper feeding device configured as described above, one of the pair of feed rollers is pressed against the other roller by the urging means so that both rollers cooperate to feed the paper. The one roller itself is attracted in the opposite direction to the other roller by the excitation of the solenoid, and is separated from the other roller.

Therefore, it is not necessary to provide another member such as a movable member or a plunger between the one feed roller and the solenoid.
Compared with the conventional paper feeding device, the number of parts is reduced, the structure of the device is simplified, and the device can be downsized. Further, the effect of reducing the device cost can be obtained.

Embodiment An embodiment in which the present invention is applied to a sheet feeding device of a cash register will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, 10 is a driven roller, which is made of a magnetic material. The driven roller 10 has a support shaft 12
Is integrally formed with the support shaft 12 and is supported by a pair of guide members 14 at both ends of the support shaft 12. Each guide member
The body 16 of 14 is provided with a fitting hole 18 into which the support shaft 12 is fitted, and a pair of engaging protrusions 20 extending upward at a right angle to the fitting hole 18. A drive roller 24 is arranged below the driven roller 10. The drive roller 24 is fixed to the rotary shaft 26, and is rotated with the rotation of the rotary shaft 26 by a drive device (not shown).

The driven roller 10 is supported by a frame 28 of the cash register via a guide member 14. Frame 28
Is a groove-shaped member composed of an upper wall 30 extending substantially horizontally and a pair of side walls 31 extending downward from both sides thereof.
A pair of engagement grooves 32, which are separated in the longitudinal direction of the driven roller 10, are formed in the upper part of the. In addition, a pair of engaging notches 33 extending in the same straight line as the engaging groove 32 are formed at the lower end of each side wall 31. In the guide member 14, the engagement protrusion 20 has an engagement groove.
32, both ends of the main body 16 are engaged with the engagement notches 33 on both side walls 31 respectively.
It is engaged from the inside and is movable up and down along the engagement groove 32 and the engagement notch 33. Therefore, the driven roller 10 moves vertically on the frame 28, that is, the drive roller.
It is supported so that it can approach and separate from 24.

Supporting protrusions 34 extending in parallel with the engaging protrusions 20 are formed between the engaging protrusions 20 of each guide member 14. A compression coil spring 36 as an urging means is inserted into the support protrusion 34. The compression coil spring 36, as shown in FIG.
The guide member 14 and the upper wall 30 of the frame 28 are positioned and arranged by a protrusion 38 formed on the lower surface of the upper wall 30. The guide member 14 is always biased downward and driven. The roller 10 is pressed against the drive roller 24.

A solenoid 40 is attached between the protrusions 38 of the upper wall 30 of the frame 28. The solenoid 40 faces the outer peripheral surface of the driven roller 10 on the side opposite to the drive roller 24, and the iron core 42 is arranged inside. The iron core 42 is fixed to the upper wall 30 by crimping a protrusion 44 formed on the upper end portion thereof into a hole 46 of the upper wall 30. Therefore, when the solenoid 40 is excited, the iron core 42 is magnetized, and the driven roller 10 is attracted against the biasing force of the compression coil spring 36. In the present embodiment, the solenoid 40 and the iron core 42 form a separating device.

 Next, the operation will be described.

Normally, the driven roller 10 is pressed against the drive roller 24 by the urging force of the compression coil spring 36.
When a belt-shaped sheet (not shown) is supplied between 10 and 24, the solenoid 40 is excited and the iron core 42 is magnetized to attract the driven roller 10. Therefore, the driven roller 10 moves upward together with the guide member 14 toward the upper wall 30 of the frame 28 against the biasing force of the compression coil spring 36, and is separated from the drive roller 24.

After the sheet is supplied between the rollers 10 and 24, the solenoid 40 is demagnetized and the driven roller 10 is compressed by a compression coil spring.
Both rollers 1 are pressed by the driving roller 24 by the urging force of 36.
The sheet is pinched by 0 and 24. Then, the sheet is sent to a printing unit such as a printer (not shown) by the rotation of the driving roller 24 and the rotation of the driven roller 10 associated therewith.

The present embodiment is a mere example, and the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of a paper feeding device according to an embodiment of the present invention. FIG. 2 is a front sectional view of the above device. FIG. 3 is a front sectional view showing a conventional paper feeding device. 10: driven roller, 14: guide member 24: drive roller, 36: compression coil spring 40: solenoid, 42: iron core

Claims (1)

(57) [Scope of utility model registration request] 1. A pair of feed rollers for feeding sheets in cooperation with each other, an urging means for pressing one of the pair of feed rollers to the other, and one of the feeding means against the urging force of the urging means. A paper feeding device including a separating device that separates the roller from the other feeding roller, wherein the one feeding roller is made of a magnetic material, and the outer circumference surface of the one feeding roller is different from the other feeding roller. A paper feeding device, characterized in that the separating device is constituted by a solenoid which opposes from the opposite side and attracts one of the feeding rollers itself.