JPH028305Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper feeding device for copying machines, printing machines, etc.

In a paper feeding device in which a rotating paper feeding member is brought into contact with a stack of paper, and the paper is fed out one by one intermittently by the frictional force between it and the paper, the contact surface of the rotating paper feeding member It is desirable to clean the rotary paper feeding member because if it becomes dirty, the paper will become dirty. If this cleaning is done while the copying machine or printing machine is not operating, it can be done without damaging the paper feeding function, but stains will occur even if just one sheet of paper is fed through, such as when a single-sided copy has been made. Therefore, it is desirable to automatically perform cleaning while the copying machine or printing machine is in operation, and moreover, each time a sheet of paper is fed out. However, it must not impair the paper feeding function.

The present invention is in response to this demand, and aims to clean the rotating paper feeding member during operation without impairing the paper feeding function. , which shows the first example thereof.

Reference numeral 1 denotes a paper feed tray, which is provided at an angle, and sheets 2 are stacked on it. A paper feed roller 3 is disposed on the lower edge of the paper feed table 1, and an endless belt 6 stretched around pulleys 4 and 5 is disposed. The endless belt 6 is pressed against the paper feed roller 3 and supports the lower edge of the paper 2. Pinch rollers 7 and 8 press against each other and are arranged downstream of the paper feed roller 3.

The paper feeding operation is started by rotating the paper feeding roller 3 in the direction of arrow A, and the bottom layer of the paper 2 is moved toward the rolling contact portion of the pinch rollers 7 and 8 due to the frictional force from the paper feeding roller 3. At this time, the endless belt 6 is driven to run in the direction of arrow B to prevent two or more sheets 2 from being fed out in an overlapped manner. The fed paper 2' is baton-touched by pinch rollers 7 and 8, and is thereby continuously conveyed in the direction of arrow C.

The above is a known paper feeding device, but in the present invention, a cleaning device for the paper feeding roller 3 is added thereto. A cleaning belt 9 is wound around pulleys 10 and 11 and is pressed against the paper feed roller 3. The pulleys 10 and 11 are supported by a moving table 15, and a motor 16 installed on the moving table 15 supplies pulleys 12 and 14 and a belt 13.
Driven through. The movable table 15 can move in the direction of arrow D, thereby separating the cleaning belt 9 from the paper feed roller 3.

As mentioned above, the paper 2' is fed out by the rotation of the paper feed roller 3, but at this time, the cleaning belt 9 is in pressure contact with the paper feed roller 3 and is running as shown by the arrow E. The entire circumferential surface of the paper feed roller 3 is cleaned.

After a while after the paper 2' is baton-touched by the pinch rollers 7 and 8, the driving force to the paper feed roller 3 is cut off. This is the first sheet of paper 2'
This is to prevent the second sheet of paper from being fed out after the paper has passed. Therefore, before the trailing edge of the first sheet 2' leaves the paper feed roller 3, it is transported by the driving force of the pinch rollers 7 and 8 without receiving any driving force from it. At this stage, the paper feed roller 3 needs to be able to rotate freely. Otherwise, the paper feed roller 3 would brake the paper 2', causing slippage between the paper feed roller 3 and the pinch rollers 7 and 8.

Therefore, in this embodiment, it was decided to retreat the movable table 15 in the direction of arrow D in synchronization with the timing of cutting off the driving force to the paper feed roller 3.
As a result, the paper feed roller 3 is released from pressure contact with the cleaning belt 9, so that it is no longer subjected to the braking action caused by the cleaning belt 9 and can rotate freely. Therefore, no braking action is applied to the paper 2'.

FIG. 3 shows a second embodiment. In this example, the sheets 2 are stacked horizontally, and the sheet feeding member 17 is pressed against the top layer. Paper feeding member 17
consists of two arms with arc-shaped friction surfaces 17a and 17b, and is intermittently rotated in the direction of arrow F by a shaft 18. When one friction surface 17a is in contact with the paper 2, the other friction surface 17b
is in contact with the cleaning belt 9.

When the shaft 18 rotates the paper feeding member 17 by half a rotation in the direction of arrow F, at the beginning, only one sheet of the uppermost layer of paper 2 is fed out by the frictional force from the frictional surface 17a, and is baton-touched by a pinch roller (not shown). . At this time, the friction surface 17b is cleaned by the cleaning belt 9, and when the half rotation is completed, the friction surface 17b waits in front of the paper 2. In this embodiment, the period during which the paper 2 is being conveyed only by the pinch rollers means that the friction surface 1
Since this is a period in which neither 7a nor 17b is in contact with the paper 2, there is no possibility that this will interfere with the conveyance of the paper 2.

In the third embodiment shown in FIG. 4, the cleaning pad 19 is pressed against the paper feed roller 3 that is in pressure contact with the upper surface of the paper 2, and cleaning is performed by the rotation of the paper feed roller 3. When the paper feed roller 3 enters a period in which it is required to freely rotate due to being baton-touched by a pinch roller (not shown), the pressure contact of the cleaning pad 19 is released.

In the fourth embodiment shown in FIG.
As shown by H, cleaning is performed by contacting the rollers in a reverse rotation state, and the cleaning roller 20 is further cleaned by the blade 21, but the cleaning roller 20 is allowed to rotate freely during the period when the paper feed roller 3 should be allowed to freely rotate. Therefore, the cleaning roller 20 rotates in the reverse direction, and there is no relative movement of the circumferential surface with the paper feed roller 3, so that no cleaning action is performed during that period.

FIG. 6 shows an example in which a rotating brush 22 is used instead of the cleaning roller 20, and during the free rotation period, the drive of the rotating brush 22 in the direction of arrow H is released and the rotating brush 22 is allowed to rotate freely.

As described above, in the present invention, the cleaning member is provided in pressure contact with the rotating paper feeding member, and cleaning is performed by utilizing the rotation of the rotating paper feeding member performed for feeding paper, so that during the paper feeding operation, Cleaning can be performed automatically at all times, and since the cleaning member does not interfere with the free rotation of the rotary paper feed member after the conveyance of the paper is baton-touched to the subsequent conveyance member, the paper feed function can be disabled. There is no risk of damage.

[Brief explanation of drawings]

FIG. 1 is a front view of the first embodiment of the present invention, FIG. 2 is a plan view of the essential parts, FIG. 3 is a front view of the second embodiment, and FIG. 4 is a perspective view of the third embodiment. Figures 5 and 6
The figures are front views of the fourth and fifth embodiments. 1... Paper feed table, 2, 2'... Paper, 3... Paper feed roller, 7, 8... Pinch roller, 9... Cleaning belt, 15... Moving table, 17... Paper feeding member, 19 ...Cleaning pad, 20...
Cleaning roller, 22...rotating brush.

Claims (1)

[Scope of utility model registration request] In a paper feeding device in which a rotating paper feeding member having a full circumferential surface or a partial circumferential surface is pressed against paper on a paper feeding table and the paper is fed out by the frictional force, the rotating paper feeding member is pressed against the rotating paper feeding member. A cleaning member is provided to perform cleaning by rotating the rotary paper feed member for feeding paper, and after the paper is conveyed from the rotary paper feed member to another subsequent conveyance member, A cleaning device for a rotating paper feeding member, characterized in that the cleaning member is configured so as not to restrict free rotation of the rotating paper feeding member.