JPH045479Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper feeding mechanism equipped with a brush for cleaning a paper feeding roller.

[Conventional technology]

FIG. 2 is a side view showing a conventional paper feeding mechanism of this type used in printing devices, etc. In the figure, 1 is an upper guide plate, and 2 is arranged with a predetermined gap from this upper guide plate 1. One end of the lower guide plate 2 is bent into a concave shape to form an accumulation section 3.

Reference numeral 4 indicates a plurality of sheets of paper stored in the stacking section 3.

Reference numeral 5 denotes a paper feeding roller disposed near the end of the paper feeding side of the stacking section 3, the surface of which is made of rubber having a high coefficient of friction. 6 is a drive shaft for rotating the paper feed roller 5; 7 is a one-way clutch provided between the drive shaft 6 and the paper feed roller 5; the drive shaft 6 is rotatably supported by a side plate or the like (not shown); and rotates counterclockwise toward the drawing by a drive source such as a motor (not shown).
Also, one-way clutch 7 is connected to drive shaft 6.
It is set so that only the rotation of the paper feed roller 5 is transmitted to the paper feed roller 5.

Reference numeral 8 denotes a reverse roller brought into contact with the paper feed roller 5, which is rotated counterclockwise by another drive source (not shown) that is different from the drive source.
In other words, the reverse roller 8 is configured to rotate in the opposite direction to the direction in which the paper 4 is fed by the paper feed roller 5.

Reference numeral 9 denotes a support frame, one end of which is rotatably attached to the drive shaft 6, and the other end supporting a pick-up roller 10 so as to be positioned above the sheets 4 of the stacking section 3. 10 receives the rotational force of the paper feed roller 5 by a transmission belt (not shown) and rotates at the same circumferential speed.

Also, the pick-up roller 1 of the support frame 9
A reset spring 11 is stretched between the 0 side upper part and the device frame, etc., and the other end of the support frame 9 is constantly pulled upward by the reset spring 11.

A pin 12 is provided on the outer surface of the support frame 9 and is located between the paper feed roller 5 and the pick-up roller 10.

Reference numeral 13 denotes a solenoid disposed below the support frame 9, and a movable shaft 14 of this solenoid 13.
The lower end of the link 15 is connected to the lower end of the link 15, and the upper end of the link 15 is formed with a U-shaped notch, and the pin 12 is engaged with this notch.

Further, a pin 16 is provided in the middle of the link 15, and a connecting spring 17 is stretched between the pin 16 and the pin 12.

18a and 18b are a pair of upper and lower feed rollers, which are arranged at a predetermined distance from the paper feed roller 5 and the reverse roller 8, and the feed rollers 18a and 18b are driven by the same driving source as the reverse roller 8 (not shown), for example. It is designed to rotate at the same circumferential speed as the paper feed roller 5 via a power transmission mechanism consisting of gears or the like or by another drive source.

Reference numeral 19 denotes a cleaning brush, and this brush 19 is arranged and fixed so as to be in contact with the paper feed roller 5 at a predetermined position.

Incidentally, the upper guide plate 1 and the lower guide plate 2 are each provided with holes of a predetermined shape, and these holes allow the paper feed roller 5 and the reverse roller 8, and the feed rollers 18a and 18b to be connected to the upper guide plate 1 and the lower guide plate. The pick-up roller 10 enters between and contacts the guide plate 2 from above and below, and the pick-up roller 10 can come into contact with the paper 4 through a hole provided in the upper guide plate 1.

The operation of the above-described configuration is as follows.

First, a drive source (not shown) operates in response to a paper feed start signal from the outside, and the drive shaft 6 rotates counterclockwise.The rotational force is transmitted to the paper feed roller 5 by the one-way clutch 7, and the drive shaft 6 is rotated counterclockwise. 5 rotates counterclockwise, and the pick-up roller 10 rotates at the same circumferential speed as the paper feed roller 5 via a transmission belt (not shown).

At the same time, the reverse roller 8 is rotated counterclockwise by another drive source (not shown), and the feed rollers 18a and 18b are also rotated at the same peripheral speed as the paper feed roller 5.

When each roller rotates in this manner, the solenoid 13 is subsequently turned on and its movable shaft 14 is attracted. This results in link 15 and pin 1
Connection spring 17 stretched between 2 and 16
Since the support frame 9 is pulled through the support frame 9, the support frame 9 rotates downward around the drive shaft 6 against the spring force of the reset spring 11, and the pick-up roller 10 supported by the support frame 9 is integrated. It is pressed onto the topmost paper 4 stacked in section 3.

Here, the paper 4 is fed out from the stacking section 3 by the rotation of the pick-up roller 10 that is in pressure contact with it, and its leading edge is connected to the paper feed roller 5 and the reverse roller 8.
caught between. Then, the paper 4 is fed toward the feed rollers 18a and 18b by the rotation of the paper feed roller 5.
When, for example, two sheets of paper 4 are fed out and sandwiched between the paper feed roller 5 and the reverse roller 8,
The lower paper 4 that does not come into direct contact with the paper feed roller 5 is sent back to the stacking section 3 by the reverse roller 8.

Then, the paper 4 fed by the paper feed roller 5
passes between the upper guide plate 1 and the lower guide plate 2, and its tip is sandwiched between the feed rollers 18a, 18b.
When the paper 4 is further fed by a sensor (not shown), the leading edge of the paper 4 is detected by a sensor (not shown).

Based on the output signal of this sensor, solenoid 1
3 is turned OFF, which causes the support frame 9
rotates upward around the drive shaft 6 due to the restoring force of the reset spring 11,
The pick-up roller 10 separates from the paper 4 and retreats upward. At the same time, the drive source for the drive shaft 6 is also stopped, and as a result, the rotation of the paper feed roller 5 and pick-up roller 10 is stopped, but the rotation of the reverse roller 8, feed roller 18a,
Rotation of 18b continues.

On the other hand, the paper 4 is fed by a feed roller 18.
This is continued by the rotation of the paper 4, but at this time, there are feed rollers 18a, 18 on the rear end side of the paper 4
Since the rotational force of the reverse roller 8 which is smaller than the feeding force b is applied, the paper 4 is stably fed at the circumferential speed of the feed rollers 18a and 18b without sagging, and the rear end of the paper 4 is transferred to the feed roller 1.
8a and 18b and is detected by the sensor, the reverse roller 8 and the feed roller 18
The driving sources for a and 18b are stopped.

As described above, one sheet of paper 4 is fed from the stacking section 3 and fed to the printing section (not shown).
During this operation, the brush 19 that is in contact with the paper feed roller 5 rubs the surface of the paper feed roller 5 as it rotates, thereby removing dust such as paper powder that adheres to the paper feed roller 5 during paper feeding. This prevents the friction coefficient of the paper feed roller 5 from decreasing.

Further, as described above, the reverse roller 8 not only prevents the paper 4 from being fed two sheets from the stacking section 3, but also prevents the paper from jamming when a paper jam occurs between the paper feed roller 5 and the paper feed roller 5. It also serves to send paper etc. back to the stacking section 3. Therefore, at this time, it is necessary to stop the rotation of the drive shaft 6 and rotate the paper feed roller 5 in the clockwise direction, and therefore a one-way clutch 7 is provided to enable the clockwise rotation of the paper feed roller 5. This reversal of the paper feed roller 5 in the clockwise direction is performed by the force from the reverse roller 8.

[Problem that the invention attempts to solve]

However, in the case of the conventional paper feeding mechanism mentioned above,
Since the cleaning brush is constantly in contact with the surface of the paper feed roller, there is a problem that the surface of the paper feed roller, which is made of rubber, is subject to a lot of wear, which shortens the life of the paper feed roller. There is also a problem in that dust such as paper powder removed from the surface of the paper feed roller falls onto the paper and stains the paper surface.

In addition, since the brush is fixed and the load on the paper feed roller is large, there is a difference in the circumferential speed between the paper feed roller and the feed roller, resulting in paper slippage at the position of the feed roller. If a paper jam occurs between the paper roller and the reverse roller, and it becomes necessary to reverse the paper feed roller clockwise by the reverse roller, the load from the brush is too large and the paper feed roller cannot be reversed. There is also the problem that there is.

The present invention was developed to solve these problems, and it is possible to prolong the life of the paper feed roller, prevent the paper from getting dirty, and prevent the paper from slipping at the feed roller position.
Moreover, it is an object of the present invention to realize a paper feeding mechanism that can reliably reverse the paper feeding roller using a reverse roller when a paper jam or the like occurs.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a cleaning unit including a brush and a container rotatably so as to be able to come into contact with and separate from the paper feed roller.
This cleaning unit is connected via a connecting member to power means such as a solenoid for bringing the pick-up roller into contact with the paper.

[Effect]

In the present invention having the above-described configuration, when the pick-up roller is pulled by the power means to press the paper into contact with the paper in order to feed the paper, the cleaning unit is simultaneously rotated via the connecting member, thereby feeding the brush. Remove dust such as paper powder by bringing it into contact with a paper roller. The removed dust is received and stored in a container, and when the pick-up roller is moved away from the paper and retracted, the cleaning unit is also moved away from the paper feed roller.

Therefore, according to this, the brush comes into contact with the paper feed roller only when feeding the paper, so that the wear of the paper feed roller is reduced and the life of the paper feed roller is extended.

In addition, since the dust brushed off by the brush is stored in a container, the paper is not soiled, and the load on the paper feed roller is also reduced and there is no difference in peripheral speed with the feed roller, which prevents the paper from slipping. Moreover, since the brush can be kept separated from the paper feed roller when a paper jam occurs, the paper feed roller can be reliably reversed by the reverse roller.

〔Example〕

Examples will be described below with reference to the drawings.

Figure 1 is a side view showing an embodiment of the paper feeding mechanism according to the present invention, in which Figure I shows a state in which the cleaning unit is separated from the paper feed roller, and Figure I shows a state in which the cleaning unit is in contact with the paper feed roller. It is.

In the figure, 1 to 18a and 18b are the same parts as those in FIG. 2, and are constructed in the same way.

Reference numeral 20 denotes a cleaning unit used in this embodiment, which includes a cleaning brush 21 for removing dust such as paper powder adhering to the surface of the paper feed roller 5, and a cleaning brush 21 for receiving and storing the dust removed by this brush 21. The cleaning unit 20 is constructed by integrating the brush 21 with a container 22, and the cleaning unit 20 is rotated around a shaft 23 supported by a side plate (not shown) so that the brush 21 can come into contact with and separate from the surface of the paper feed roller 5. It is movably mounted.

24 is a protrusion provided on the outer surface of the cleaning unit 20; 25 is a connecting member; the upper end of the connecting member 25 is rotatably connected to the protrusion 24; It is connected to the shaft 14.

26 is a reset spring stretched between the projection 24 and the device frame, and 27 is a limiter of the movable shaft 14 provided on the solenoid 13.

Next, the operation of the above-described configuration will be explained.

Note that since the feeding of the paper 4 is carried out in the same manner as in the conventional method, the operation of the cleaning unit 20 will be mainly explained here.

First, when feeding paper, each roller is rotated in a predetermined direction in the state shown in FIG. The support frame 9 is pulled, thereby rotating the support frame 9 downward about the drive shaft 6, and the pick-up roller 10 comes into pressure contact with the paper 4 at the top of the stacking section 3, as shown in FIG.

At this time, the cleaning unit 20 is simultaneously pulled by the movable shaft 14 via the connecting member 25, so that the cleaning unit 20 rotates downward at a certain angle about the shaft 23 against the spring force of the reset spring 26. , the brush 21 comes into contact with the surface of the paper feed roller 5.

The paper 4 is fed out from the stacking section 3 by the rotation of the pick-up roller 10, and only one paper 4 is sent toward the feed rollers 18a, 18b by the rotation of the paper feed roller 5 and reverse roller 8. At this time, the brush 21 scrapes the surface of the rotating paper feed roller 5 to remove dust such as paper powder, and the removed dust is received and stored in a container 22.

Next, the leading edge of the paper 4 is placed on the feed roller 18.
Solenoid 13 is turned OFF by passing between a and 18b and being detected by a sensor (not shown).
When this happens, the support frame 9 rotates upward due to the restoring force of the reset spring 11, and the pick-up roller 10 is separated from the paper 4. At the same time, the cleaning unit 20 also rotates upward due to the restoring force of the reset spring 26, and the brush 21 is fed. It is spaced apart from the surface of the paper roller 5, and the upper end of the movable shaft 14 is connected to the limiter 2.
7, the rotation of the support frame 9 and the cleaning unit 20 is stopped.

After that, the paper 4 is further transferred to the feed roller 18.
It is fed by the rotation of a and 18b and is sent to a printing section (not shown).

Also, if a paper jam occurs between the paper feed roller 5 and the reverse roller 8 during the paper feeding operation,
The reverse roller 8 reverses the paper feed roller 5 in the clockwise direction, which is the opposite of the rotation during paper feeding, but at this time as well, the brush 21 of the cleaning unit 20 can be separated from the paper feed roller 5 by turning off the solenoid 13. , the brush 21 does not become a load on the paper feed roller 5.

In the embodiment described above, the solenoid 13 is used as a power means for pressing the pick-up roller 10 onto the paper 4, but a motor can also be used, and in this case, a cam or the like can be attached to the shaft of the motor. The same effect can be achieved by connecting the lower ends of the link 15 and the connecting member 25 to this cam or the like.

Further, in the above-described embodiment, the cleaning unit 2
The dust contained in the container 22 of 0 is disposed of outside the apparatus during regular maintenance, etc., but it is also possible to make only the container 22 removable so as to improve the operability at the time of disposal.

[Effect of idea]

As explained above, in the present invention, a cleaning unit including a brush and a container is arranged so that the brush can come into contact with and separate from the paper feed roller, and the cleaning unit is used to move the pick-up roller onto the paper in the stacking section. By connecting to the power means for pressure contact via a connecting member, when the pick-up roller is brought into pressure contact with the paper during paper feeding, the brush of the cleaning unit is brought into contact with the paper feed roller, and as the paper feed roller rotates. Since dust is removed from the surface of the brush, the contact between the brush and the paper feed roller is only during paper feeding, which has the effect of reducing wear on the paper feed roller and extending its lifespan compared to conventional methods. It will be done.

Further, since dust such as paper powder removed from the surface of the paper feed roller by the brush is received and stored in a container integrated with the brush, there is also an effect that the paper is not contaminated with dust as in the conventional case.

In addition, since the brush is not fixed like in the past, even if it comes into contact with the paper feed roller, the load on the paper feed roller from the brush is reduced, and the difference in circumferential speed between the paper feed roller and the feed roller is almost eliminated. This has the effect that paper slips do not occur at the feed roller section, and when a paper jam occurs between the paper feed roller and the reverse roller, the brush can be separated from the paper feed roller. Not only can the reverse roller reliably reverse the paper feed roller to send the jammed paper back to the stacking section, but also the power for rotating the cleaning unit can be obtained from the power means of the pick-up roller. This has the advantage that no special control is required and the number of parts can be kept to a minimum.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a paper feeding mechanism according to the present invention, and FIG. 2 is a side view showing a conventional paper feeding mechanism. 3... Accumulating unit, 4... Paper, 5... Paper feed roller, 6... Drive shaft, 7... One-way clutch, 8... Reverse roller, 9... Support frame, 10... Pick-up roller, 13... …
Solenoid, 15... Link, 17... Connection spring, 20... Cleaning unit, 21... Brush, 22... Container, 26... Reset spring.

Claims (1)

[Claims for Utility Model Registration] A pick-up roller that is vertically movably supported above the sheets stacked in a stacking section, a power means for moving the pick-up roller so that it comes into pressure contact with the sheets, and a pick-up roller that a paper feed roller that feeds the paper fed out from the stacking section;
In a paper feeding mechanism having a reverse roller that comes into contact with the paper feeding roller and rotates in a direction opposite to the feeding direction of the paper, a brush is provided for removing dust attached to the surface of the paper feeding roller, and the brush A cleaning unit including a container for storing removed dust is rotatably arranged near the paper feed roller, and the cleaning unit is connected to the power means via a connecting member. Paper feeding mechanism.