JPH0444510Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a paper feeding device that can be installed in a copying machine, a printer, etc.

(b) Prior Art Copying machines, printers, etc. are equipped with paper feeding devices that feed stacked sheets of paper one by one. As shown in Figures 3 and 4, this presses against the front edge of the upper surface of the paper 8 loaded on the paper feed tray 1, and rotates in the paper feed direction in response to the paper feed signal from the main body of the apparatus, until the top A pick-up roller 5 that sends out the paper 8, and a feed roller 4 located downstream of the pick-up roller 5 that rotates in the same direction as the pick-up roller 5 and conveys the paper.
and a reverse roller 3 which is in pressure contact with the feed roller 4 across the path of the paper 8 being transported and is driven to rotate in the opposite direction to the paper transport direction via a torque limiter 11 that slides with a predetermined torque. .

Further, 9 is a reverse roller rotation shaft inserted through the reverse roller 3, the torque limiter 11, and the ring 13, and this reverse roller rotation shaft 9 is provided with a detent pin 14 for the torque limiter 11, and a pin 14 near the end of the reverse roller rotation shaft 9 is provided. Hole 16 provided in chassis 7 of No. 1 (hole 1 through which pin 14 is inserted)
6) and are held in the elongated holes 17. The elongated hole 17 has a shape that allows the reverse roller shaft 9 to be urged in the direction of the feed roller 4 by a spring (not shown). 10 is a feed roller rotation shaft inserted through the feed roller 4, and the feed roller rotation shaft 10 has a first chassis 7 near its end.
It is held in a hole provided in the. Furthermore, 2 is a cover that protects the upper portions of both the rollers 3 and 4;
A second chassis 5 covers a direction perpendicular to the axis of the reverse roller shaft 9.

In such a configuration, the torque limiter 11
Therefore, the magnitude of the torque given to the reverse roller 3 is
This is set to be smaller than the frictional force between the two rollers 3 and 4 and the frictional force between the paper 8 and the rollers 3 and 4. Furthermore, the magnitude of the torque is determined by the amount of paper 8 between rollers 3 and 4.
If the value is set to be larger than the frictional force between the sheets 8 when more than one sheet is loaded, the friction force between the rollers 3 and 4 will be
When more than one sheet of paper is loaded, the reverse roller 3 rotates in the opposite direction to the paper feeding direction to prevent double feeding. Further, when there is no paper 8 between the rollers 3 and 4, or when only one paper is inserted, the reverse roller 3 follows the feed roller 4, and the paper 8 is reliably conveyed. According to this method, the roller 3,
Since there is no slippage between these rollers 3 and 4,
There is almost no wear and no paper dust.

(c) Problems to be solved by the invention However, when performing maintenance inspection or replacement of the reverse roller 3 and torque limiter 11, the feed roller 4 installed above the reverse roller 3 and the torque limiter 11,
The paper guide plate 6 etc. had to be removed, resulting in poor workability.

In other words, when replacing the reverse roller 3 and torque limiter 11, first remove the cover 2,
Next, it was necessary to remove the feed roller 4 and paper guide plate 6.

The present invention has been devised in view of the above-mentioned problems, and it is an object of the present invention to provide a paper feeding device in which the reverse roller and torque limiter can be easily maintained, inspected, or replaced.

(d) Means for solving the problem The present invention consists of a feed roller that rotates in the paper feeding direction, a reverse roller that rotates in the opposite direction to the paper feeding direction across the paper path, and a predetermined torque applied to the reverse roller. a torque limiter, a reverse roller rotating shaft that is inserted into and removably through the torque limiter and the reverse roller, a first chassis that holds the vicinity of an end of the reverse roller rotating shaft in a removable manner, and a first chassis that holds the reverse roller in a removable manner; A paper feeding device comprising a second chassis provided on the opposite side of the feed roller, wherein the second chassis is provided with a hole through which the torque limiter or the reverse roller can be freely inserted and removed. It is a paper feeding device.

(e) Function The reverse roller shaft can be inserted into and removed from the torque limiter or the reverse roller, and by providing a hole in the second chassis through which the torque limiter or the reverse roller can be inserted and removed, the reverse roller can be inserted into and removed from the torque limiter and the reverse roller. The torque limiter and reverse roller can be easily attached and detached from the hole by inserting and removing the roller rotation shaft.

(F) Embodiment FIG. 1 is a sectional view of a paper feeding device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the paper feeding device according to an embodiment of the present invention, and FIGS. The difference from the paper feeder is that there is a torque limiter 11 on the second chassis 15.
Alternatively, a hole 18 is provided through which the reverse roller 3 can pass. Further, the same parts as in FIGS. 3 and 4 are given the same reference numerals, and explanations thereof will be omitted.

In the above paper feeding device, the torque limiter 1
1. When performing maintenance, inspection or replacement of the reverse roller 3, it is sufficient to pull out the reverse roller shaft 9 in the direction of arrow a while keeping the torque limiter 11 and the reverse roller 3 stationary. That is, by pulling out the reverse roller shaft 9, the torque limiter 11 and the reverse roller 3 are no longer held and can be taken out from the hole 18. Furthermore, the torque limiter 11 and reverse roller 3 may be attached in the opposite manner to the above.

Moreover, FIG. 5 is a sectional view taken along the line -- in FIG. 1, and shows the gear 19, bearings 20, 21, spring 22, etc. which are omitted from FIGS. 1 and 2.

The reverse roller shaft 9 is inserted into bearings 20 and 21, the bearing 20 is held in the hole 16, and the bearing 21 is held in the elongated hole 17. In other words, the reverse roller shaft 9 is connected to the first chassis 7 via the bearings 20 and 21.
is held in Further, since the bearing 21 is pulled by the spring 22, the reverse roller 3 is pressed in the direction of the feed roller 4. Further, a gear 19 (which moves integrally with the reverse roller shaft 9 by a stop pin 23 provided on the reverse roller shaft 9) is driven in the direction of arrow b in FIG. 1 by a drive gear (not shown).

Although the first chassis 7 and the second chassis 15 are integrally formed in the embodiment of the present invention, they may be formed separately. Furthermore, the size of the hole 18 may be set to a size that allows at least one of the torque limiter 11 and the reverse roller 3 to pass through.

(g) Effects As is clear from the above description, the present invention separates the torque limiter or reverse roller from the reverse roller shaft by sliding the reverse roller shaft, and inserts the torque limiter or reverse roller into the second chassis through a removable hole. It is possible to take it out.

When installing in reverse, insert the torque limiter or reverse roller into the second chassis through the removable hole and slide the reverse roller shaft to fit the torque limiter or reverse roller onto the reverse roller shaft. becomes possible.

Therefore, maintenance, inspection, or replacement of the torque limiter and reverse roller becomes easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a paper feeding device according to an embodiment of the present invention, Fig. 2 is an exploded perspective view of a paper feeding device according to an embodiment of the present invention, Fig. 3 is a sectional view of a conventional paper feeding device, and Fig. 4 is a sectional view of a paper feeding device according to an embodiment of the present invention. FIG. 5 is a perspective view of a conventional paper feeding device, and FIG. 5 is a sectional view taken along the line -- in FIG. 3... Reverse roller, 4... Feed roller, 9... Reverse roller shaft, 11... Torque limiter, 7... First chassis, 15... Second
Shashi, 18... hole.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A feed roller that rotates in the paper feeding direction, a reverse roller that rotates in the opposite direction to the paper feeding direction across the paper path, a torque limiter that applies a predetermined torque to the reverse roller, and this torque limiter. a reverse roller rotation shaft that is inserted into and removably inserted into the reverse roller; a first chassis that holds the vicinity of the end of the reverse roller rotation shaft in a removable manner; and a side opposite to the feed roller with the reverse roller in between. 2. A paper feeding device comprising a second chassis provided in a paper feeding device, wherein the second chassis is provided with a hole through which the torque limiter or the reverse roller can be freely inserted and removed. 2. The paper feeding device according to claim 1, wherein the first chassis and the second chassis are integrally formed.