JPH0375467B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device for a copying machine or the like, and particularly to a paper feeding device that is set from the paper feeding direction.

[Prior Art] A conventional paper feeding device, as shown in FIG. 1, which is a perspective view of an example of setting the paper in a direction perpendicular to the paper feeding direction, sets the roll when inserting the cassette tray 1 according to the paper size. The plates 5 and 6 were moved to fix the positions of the feed rolls 2 and 3 through which the feed roll drive shaft 4 attached to the main body of a copying machine or the like passes. However, even if the paper size is the same, when the paper thickness changes, the stiffness of the paper also changes, and the way the paper bends when it hits the corner nut bars 9 and 10 that separate the sheets one by one changes, making misfeeds more likely to occur. For this reason, the present inventors developed an eccentric paper feeding device on the cassette tray bridge, as shown in the perspective view of Fig. 2, as a paper feeding device that can change the position of the feed roll depending on the paper thickness even for paper of the same size. Cams 13 and 1
We proposed a device equipped with 4. (Special application 1982-82539
issue). This device changes the distance between the feed rolls by changing the position of the eccentric cam in three stages, but there are problems with operability and it is not possible to set the feed rolls to a desired width.

Therefore, the inventor of the present invention developed a paper feeding device that allows the interval between the feed rolls to be arbitrarily set according to the paper thickness with good operability.As shown in the perspective view of FIG. 3 and the side view of FIG. A device is provided in which a drive shaft 19 with a reverse thread is provided, and two blocks 15 and 16 screwed onto this drive shaft are moved by rotation of the drive shaft to arbitrarily change the interval between feed roll setting plates 5 and 6. Proposed. This device is effective when setting the cassette tray from a direction perpendicular to the paper feeding direction, but when setting from the paper feeding direction, the position of the feed roll setting plate cannot be determined and it must be used as is. It is not possible. Note that some paper feeding devices for setting the cassette tray from the paper feeding direction are of a type in which a plurality of feed rolls at fixed positions are selected as appropriate depending on the size of the paper.
Conventionally, there is no known device that allows fine adjustment of the feed roll interval according to the stiffness of the paper.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device for a copying machine or the like, in which a cassette tray is set from the paper feeding direction, and the interval between feed rolls can be arbitrarily set according to the paper thickness with ease of operation. do.

[Structure of the invention]

The above object of the present invention is to screw together blocks for pressing a feed roll setting plate on both sides of a block drive shaft which is attached to a cassette tray and has a dial at the end and has opposite threads to each other, and to press the feed roll setting plate. A roll made of an elastic member is provided so as to come into contact with the slope of each of the blocks, and the feed rolls are spaced at a predetermined distance with the arrows attached to the blocks and the indicating line on the cassette tray bridge as targets. This is achieved by setting

The present invention is an improved device for setting the cassette tray from the direction perpendicular to the paper feeding direction, as shown in FIGS. 3 and 4, so that the cassette tray can be set from the paper feeding direction. be.

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 5 is a perspective view of an embodiment of the paper feeding device of the present invention (including a part of the main body of the copying machine), and FIG. 6 is a side view as seen from the paper feeding direction (see arrow A).

As is clear from Fig. 5, the feed roll drive shaft 4 attached to the copying machine body is installed separately from the feed rolls 2 (rear side) and 3 (front side) through which it passes, and in contact with the feed rolls. The feed roll setting plates 5 and 6 are loosely fitted to the feed roll drive shaft 4 and are movable along the drive shaft, and are held down by spring support plates 11 and 12 fixed to the main body of the copying machine. Spring 7 made of a compression spring
and 8 inwardly via the feed rolls 2 and 3.

As is clear from FIG. 6, the cassette tray 1 also has drive shafts 19 with opposite threads on both sides.
is provided in a direction perpendicular to the paper feeding direction, and two blocks 15 and 16 are provided on the drive shaft 19.
a long hole (not shown) drilled in the cassette tray bridge 25 on the storage section of the cassette tray 1.
The blocks 15 and 16 can be moved in opposite directions by screwing them together via a connecting portion 19' passing through them and rotating the dial 18 of the drive shaft.

As is clear from the above configuration, by rotating the dial 18 in accordance with the size and thickness of the paper, the distance between the blocks 15 and 16 can be adjusted between the arrows 17 and 17' on the blocks and the distance on the cassette tray bridge 25. Set the indicated line as a goal. At this time,
The feed roll setting plates 5 and 6, which are always urged inwardly in the tray together with the feed rolls 2 and 3 by springs 7 and 8, are always in contact with the slopes of the blocks 15 and 16 via the rolls 20 and 21. , blocks 15 and 1
6, it is pushed by the slope of the block and slides on the feed roll drive shaft 4. Therefore, the feed rolls 2 and 3, which are separate from the feed roll setting plates 5 and 6 and are always in contact with the plates by the springs 7 and 8, cooperate with the feed roll setting plates 5 and 6 to drive the feed rolls. It can be slid on the shaft 4 to set the desired feed roll spacing.

That is, since the slopes of blocks 15 and 16 act as stoppers, when the feed roll interval is narrowed, when blocks 15 and 16 are moved inward of the tray as dial 18 is rotated, springs 7 and 8 are always activated. The feed roll setting plates 5 and 6, which are pushed inward by the tray and are locked by contacting the slopes of the blocks 15 and 16, move inward to narrow the gap between the feed rolls. can. To widen the gap, when the blocks 15 and 16 are moved outward using the dial 18, the feed roll setting plates 5 and 6 are moved outward against the inward urging force of the springs 7 and 8. The distance between the feed rolls 2 and 3 can be widened.

The paper feeding device of the present invention is characterized in that the blocks 15 and 16 are shaped so that when a cassette tray is inserted, each block comes into contact with the feed roll setting plate and can be positioned. In the illustrated example, the block is shaped like a triangular plate, and its slope is always in contact with the setting plate, thereby restricting the inward movement of the plate. Therefore, any shape can be used as long as it has such a function. Further, the setting plates 5 and 6 are provided with rolls 2 made of an elastic material to reduce shock and friction when they come into contact with the blocks 15 and 16.
0 and 21 are blocks 15 and 16, respectively.
The springs 7 and 8 are provided so as to constantly come into contact with the slopes thereof due to the biasing forces of the springs 7 and 8.

According to the paper feeding device of the present invention, the cassette tray 1
When inserted in the paper feeding direction, the block 15 pushes the feed roll setting plate 5, and the block 16 pushes the feed roll setting plate 6, thereby determining the distance between the feed rolls 2 and 3. Thereafter, the distance between the feed rolls is adjusted by operating the dial 18 as necessary. In other words, for thick paper, it is stiff and curls strongly at the corner nut bar, so turn the dial to narrow the feed roll spacing.
Also, with thin paper, the paper is weak and curls poorly when it hits the corner nut bar, so adjust the feed roll spacing by turning the dial to widen it.

According to the apparatus of the present invention, the blocks 22, 22', 23, 23' and 24, 2 are placed on the cassette tray bridge 25 as a guide for setting the block spacing.
4', and block 16, 15.
By moving the arrows 17 and 17' attached to the arrows 17 and 17' with the indicated line as a target, the interval between the feed rolls can be determined optimally.

〔Effect of the invention〕

The present invention is a paper feeding device for a copying machine or the like in which a cassette tray is set from the paper feeding direction, and two blocks that are threaded onto a drive shaft with opposite threads on both sides are mutually rotated by rotation of the drive shaft. The feed roll setting plate can be moved any distance in the opposite direction, and the distance between the feed plates can be determined by pushing the feed roll setting plate using the block and aiming at the arrow attached to the block and the indication line on the cassette tray bridge. Yes, the feed roll spacing can be changed according to the paper thickness with the simple operation of turning the dial on the drive shaft, and fine adjustment is also possible.
This prevents paper feeding errors, and since the feed roll setting plate is provided with a roll made of an elastic material, it is possible to reduce shock and friction when the setting plate contacts the block. The tray can be inserted smoothly.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an example of a conventional paper feeder in which a cassette tray is set from a direction perpendicular to the paper feeding direction, FIGS. 2 and 3 are perspective views of an example of an improved paper feeder, and FIG. 4 is a perspective view of an example of an improved paper feeder. 3 is a side view of FIG. 3, FIG. 5 is a perspective view of an example of the paper feeding device of the present invention, and FIG. 6 is a side view of the device of FIG. 5 viewed from the paper feeding direction. Symbols in the figure: 1...Cassette tray, 2, 3...
...Feed roll, 4...Feed roll drive shaft, 5, 6...Roll setting plate, 7, 8...
Spring, 9, 10... Corner nut bar, 1
1, 12... Spring support plate, 13, 1
4... Eccentric cam, 15, 16... Block, 17, 17'... Arrow, 18... Dial, 19... Block drive shaft, 20, 21... Roll, 22, 22', 23, 23',24,24'
...Indication line, 25...Cassette tray bridge,
A...Paper feeding direction, B...Cassette insertion direction.

Claims (1)

[Claims] When inserting a cassette tray into the main body of a copying machine or the like from the paper feeding direction, the interval between the feed rolls that a feed roll drive shaft attached to the main body of the copying machine passes through is set to a distance corresponding to the paper size. For this purpose, in a paper feeding device equipped with a feed roll setting plate which is separate from the feed roll and is urged inward of the cassette tray while always in contact with the feed roll by a spring, the end portion of the feed roll setting plate attached to the cassette tray 1 is Blocks 15 and 16 for pressing the feed roll setting plates 5 and 6 are respectively screwed onto a block drive shaft 19 which is equipped with a dial 18 and has opposite threads to each other. 20 and 21 are provided so as to come into contact with the slopes of the respective blocks, and the distance between the feed rolls 2 and 3 is set to a predetermined distance with the arrows attached to the blocks and the indicating line on the cassette tray bridge 25 as targets. A paper feeding device characterized by setting.