JPH04153135A - Separated sheet supply device - Google Patents

Abstract

PURPOSE:To stabilize generated torque by forming a torque generation means with a cylindrical magnet and a metal-made cylinder, which has an inner diameter larger than the outer diameter of the magnet and in which slits are formed, and decelerating generated torque to be transmitted to a separated roller. CONSTITUTION:A cylindrical magnet 21 is fixed to the shaft 20 fixed to a bracket 7, and a cylinder 22, which has an inner diameter larger than the outer diameter of the magnet 21 and in which plural slits 22a are formed, is rotatably provided on the shaft 20 to be inserted in the magnet 21 to be made a torque generation means 29. A rotation gear 23 is provided on the side part of the cylinder 22, and deceleration is made with reduction gears 26, 27, and 28 to transfer generated torque to a separated roller 5. Also the generated torque can be adjusted by adjusting the relative positions of the magnet 21 and the cylinder 22. Thus the generation of separation torque is made non-touching by magnetic force, resulting in the unnecessariness of lubricant, etc., and the stabilization of the generated torque.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper separation and feeding device that is applied to printers, copying machines, and the like, and is capable of separating and feeding sheet-like paper one by one.

(Prior art) Figure 4 is a front view showing an example of a conventional paper separation feeder;
The figure is a partially sectional side view of the paper separation/feeding device shown in FIG. A pressure plate presses the pickup rollers in two directions; 4 is a paper feed roller supported on the paper feed roller shaft 4a; 5 is a separation roller that is in elastic contact with the paper feed roller 4 under the force of a spring 6; 7 is a separation roller A bracket IO that supports the separation roller shaft 8 that supports the separation roller 5 and is rotatable around the support shaft 9 includes a first clutch body 11 provided on the separation roller shaft 8, a spring clutch 12, and the separation roller 5. The clutch means consists of a second clutch body 13 engaged with a protrusion 5a on the side of the clutch member.

In the same figure, a plurality of originals l are placed on the pickup roller 2.
is transported to the nib portion of the separation roller 5 and paper feed roller 4,
The paper feed roller 4 receives the force of feeding the paper further downstream, but the separation roller 5 is pressed against the paper feed roller 4 by a predetermined force (Pgf) by the spring 6, and further has an idling torque generated by the clutch means 10. Because of this, separation roller 5
The frictional force between the document 1 and the document 1 separates the document so that only the lowest document (on the paper feed roller 4 side) is fed downstream.

The last document 1 is fed downstream because the separating roller 5 rotates in the conveying direction together with the paper feeding roller 4 due to the conveying force greater than the idling torque of the clutch means 10.

FIG. 6 is a partially sectional side view of another conventional paper separation and feeding device, showing a friction material 15 having a constant friction coefficient on both sides of the separation roller 5 and a contact member 16 in contact with the friction material 15. The other end of a separation spring 18, one end of which is fixed to an adjustment boss 17 fixed to an arbitrary part of the separation roller shaft 8, is in elastic contact with the contact member 16 on the right side, and the contact member 16 on the left side is integrally connected to the collar. The present invention differs from the conventional devices shown in FIGS. 4 and 5 in that the clutch means 14 is configured by being supported by 19. Note that members corresponding to those already described are given the same reference numerals and detailed explanations are omitted.

In the conventional device shown in FIG. 6, a separation spring 18 applies pressing force to a friction material 15 and a friction member 16 having a constant friction coefficient in a clutch means I4 to generate torque. By changing the pressing force of the separation spring 18 by changing the position,
This allows the generated torque to be adjusted.

(Problems to be Solved by the Invention) Among the conventional devices described above, in the devices shown in FIGS. 4 and 5, a lubricant such as grease is used for the clutch means 10 for a lubricating effect, and its aging performance is Considering this, maintenance is required. Furthermore, since the generated torque value cannot be changed, a constant torque is applied to separate paper from thin paper to thick paper, and there is a problem that initial separation and conveyance cannot be guaranteed.

Furthermore, although the clutch means 14 of the device shown in FIG. 6 can solve the problems of the clutch means 10 described above, the generated torque value is easily influenced by the surface condition of the friction material 15 and the contact member 16. , since the initial value is not stable and is easily influenced by the environment (temperature, humidity), there is a problem that the torque is likely to fluctuate.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional apparatus described above and to provide a paper separation and feeding device that can perform stable paper separation and feeding.

(Means for Solving the Problems) In order to achieve the above object, the first means of the present invention includes a paper feed roller that rotates in the paper conveyance direction, and a predetermined rotational torque that is in contact with the paper feed roller. In a paper separation feeder that is equipped with a separation roller that rotates only when an occurrence occurs, and separates and feeds paper sheets one by one using the paper feed roller and separation roller, a cylindrical magnet and an inner diameter larger than the outer diameter of this magnet, The present invention is characterized in that it includes a torque generating means made of a metal cylindrical body with a slit formed therein, and a reduction gear that transmits the torque generated by the torque generating means to the separation roller.

Further, the second means is characterized in that, in the first means, the relative position between the magnet and the cylindrical body can be moved, and the torque generated by the torque generating means can be adjusted.

(Function) According to the first means described above, the torque during separation and conveyance in the separation roller is received from the torque generation means with a non-contact structure using magnetic force. There is no need for lubricant, there is no need for maintenance such as its replacement, and the initial value is stable because the influence of the surface condition is small.Furthermore, the generated torque is stable because the influence of environmental changes is small, and the separation roller and supply The separation and feeding operation of the paper roller becomes stable.

According to the second means, the generated torque can be adjusted by changing the relative position between the magnet of the torque generating means and the cylindrical body. Torque can be changed.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a partially sectional side view of one embodiment of the present invention, and FIG.
The figure is a perspective view of essential parts of the embodiment shown in FIG. 1, and members corresponding to those of the apparatus explained in FIGS. 4 to 6 are given the same reference numerals and detailed explanations will be omitted.

In FIG. 1, 20 is a shaft whose both ends are fixed to the bracket 7, 21 is a cylindrical magnet whose boss portion 21a is fixed to the shaft 20, and 22 is a cylindrical magnet with an inner diameter larger than the outer diameter of the magnet 21, and which has a plurality of A cylindrical body formed with a slit 22a and a protruding piece 22b, and rotatably provided on the shaft 20 so as to be inserted into a part of the magnet 21.

23 is a rotating gear provided on the side of the cylindrical body 22; 24 is a connecting gear having a boss portion 24a fixed to the separation roller shaft 8; 25
26 is a first reduction gear meshing with the rotary gear 23 and the second reduction gear 27 provided on the shaft 20; 28 is the second reduction gear 27 and the connection gear 24; The magnet 21 and the cylindrical body 22 constitute a torque generating means 29.

FIG. 3 is an explanatory diagram showing a cross section of the torque generating means 29, and the magnet 21 is inserted into the slit 22a of the cylinder 22.
A plurality of (six in this example) protruding pieces 2 formed by
The cylindrical body 22 is divided into six poles, a south pole and a north pole, corresponding to the magnet 2b, and the cylinder body 22 is rotatable around the magnet 21 and movable in the axial direction of the shaft 20.

In the above embodiment, the cylindrical body 22 rotates while receiving the magnetic force of the magnet 21, and this rotation is caused by the rotating gear 23. First to third reduction gears 26 to 28. It is transmitted to the separation roller 5 via the connecting gear 24. Therefore, when the paper feed roller 4 and the separation roller 5 separate and feed the paper, the rotational torque of the cylinder body 22 is as follows.
It is decelerated and transmitted to the separation roller 5, where it is used as separation torque.

Furthermore, when the cylinder body 22 is moved to change its relative position with the magnet 21, the magnetic force between the cylinder body 22 and the magnet 21 changes because the cylinder body 22 has a slit 22a.
The rotational torque at will change, and the separation torque will also change. Therefore, the type of paper to be fed (cardboard, etc.)

The separation torque can be adjusted so that separation and conveyance is performed accurately for different types of thin paper (such as differences in the quality of two types of paper).

As described above, in this embodiment, the magnet 21 and the cylinder 22
Since the structure that generates the rotational torque (separation torque) is a non-contact structure using magnetic force, there is no need for lubricants such as grease, maintenance such as grease replacement is unnecessary, and the rotational torque between the magnet 21 and the cylinder 22 is Since the influence of surface conditions and environmental changes on the generation operation is small, the initial torque value 2 and the raw torque are stable, and good paper separation and feeding is performed over a long period of time.

(Effects of the Invention) As explained above, according to the first means of the present invention, the separation torque of the separation roller is obtained by the non-contact structured torque generation means using magnetic force, so that it is easy to handle and stable torque is generated. According to the second means, by adjusting the torque generated by the torque generating means, the separation torque can be changed depending on the paper to be fed, and each means can perform stable separation and feeding. A reliable separation paper feeding device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of an embodiment of the paper separation and feeding device of the present invention, FIG. 2 is a perspective view of the torque generating means of the present embodiment, and FIG. 3 is a diagram of the torque generating means of the present embodiment. An explanatory diagram showing a cross section; FIG. 4 is a front view showing an example of a conventional paper separation feeding device;
FIG. 5 is a partially sectional side view of the separation sheet feeding device shown in FIG. 4, and FIG. 6 is a partially sectional side view of another conventional separation sheet feeding device. 4... Paper feed roller, 5... Separation roller, 2] Magnet, 22... Cylindrical body, 22a... Slit, 22
b...Protruding piece, 27.28. , 29...reduction gear,
29... Torque generating means.

Claims (2)

[Claims] (1) Equipped with a paper feed roller that rotates in the paper transport direction and a separation roller that rotates only when a predetermined rotational torque is generated in contact with the paper feed roller, and the paper feed roller and separation roller separate the paper. In a paper separation device that separates and feeds sheets one by one, a cylindrical magnet and an inner diameter larger than the outer diameter of this magnet,
A separating sheet feeding device comprising: a torque generating means comprising a metal cylinder having a slit; and a reduction gear for transmitting the torque generated by the torque generating means to the separating roller. (2) The separation sheet feeding device according to claim (1), characterized in that the relative position between the magnet and the cylindrical body is movable, and the torque generated by the torque generating means can be adjusted.