JPS5819574B2 - Paper feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stacked sheet feeding device.

One of the paper feeding methods for laminated paper is the bottom plate pressure method.
The paper feed roller is rotated intermittently by the cooperation of the one-turn clutch and the one-way clutch, and the topmost sheet placed on the bottom plate of the paper feed table is pressed against the paper feed roller to feed the paper. .

When replacing or replenishing sheets to the paper feed tray, it is necessary to pull out or remove the paper feed tray from the device. To do this, move the pressure member of the suppression mechanism that presses the bottom plate away from the paper feed roller. The top sheet must be spaced away from the feed rollers.

Regardless of the amount of sheets placed on the bottom plate, the pressure member must be retracted sufficiently to the bottom dead center to allow the paper feed tray to be pulled out or removed. This has the drawback that the amount of deformation of the spring acting on the pressure member becomes large, requiring force to release the pressure member, and making it difficult to operate the operating lever.

In an apparatus having multiple stages of paper feeding mechanisms described above, in order to select and switch one of the paper feeding operations, each paper feeding roller of the upper and lower paper feeding mechanisms is rotated intermittently. Paper feed switching is performed by selectively switching and retracting the bottom plate pressing mechanism of an unused cassette by operating a lever or the like.

This paper feed switching method particularly requires a switching mechanism and its operation, and the amount of deformation of the spring for retracting the pressure member is large, as in the case described above.

The operation becomes difficult when switching the control lever, and also.

When attaching the paper feed tray to the device, the operating lever must be operated in order to press the pressure member against the bottom plate of the paper feed tray, so as in the case above, switching the operating lever is difficult. There was a drawback.

An object of the present invention is to be able to separate the sheets from the paper feed roller by retracting the pressure member by a certain amount regardless of the amount of sheets stacked on the paper feed tray, and to attach the paper feed tray to the device. At this time, the pressure member is allowed to advance a certain amount toward the bottom plate of the paper feed table to raise the bottom plate.

It is an object of the present invention to provide a cassette paper feeding device that eliminates the above-mentioned conventional drawbacks.

The present invention will be explained below with reference to illustrated embodiments.

In FIG. 1, the holding members 1 and 2 are fixed to an immovable member (not shown), and the holding members 1 and 2 are fixed to an immovable member (not shown).
Four parts 4.5 are provided to hold a cassette-shaped paper feed tray 3 (hereinafter referred to as a paper feed tray) inserted into the cassette, and the side wall of this concave holding portion 4. pin 6 for
(one not shown) are each firmly planted.

The paper feed tray 3 is comprised of a paper feed tray that can be taken in and out of the holding members 1 and 2 or a cassette that can be attached to and removed from the holding members 1 and 2.

An operating shaft 7 and a tube shaft 8 of a first release lever 18 are pivotally attached to one end of the holding members 1 and 2, respectively, and one end of the operating shaft 7 is rotatably fitted onto the tube shaft 8. It matches.

One end of the spring 9 wound around the operating shaft 7 is engaged with a notch provided in the tube shaft 8, and the other end is engaged with a notch of a detection member 11 pivotally connected to the operating shaft 1. Due to the elasticity of the spring 9, the first release lever 18 moves in the direction of the arrow 12.
, and the sensing member 11 is rotated in the direction of the arrow 13, so that the actuating shaft 7 and the first release lever 18 have the tendency to engage with each other.

The tube shaft 8, the detection member 11, the operating shaft 7, and the spring 9 constitute a spring clutch 14.

A base of an arm member 15 is fixed to one end of the operating shaft 7, and a pin 1 fixed to the free end and a pin 1 fixed to the immovable member.
Due to the elasticity of the spring 17, which has a tensile habit and whose ends are respectively locked to the actuating shaft 7 and the first release lever 18 connected thereto, the actuating shaft 7 and the first release lever 18 connected thereto have a tendency to rotate in the direction of the arrow 13 during normal life. It is given.

A long hole 18a bored in the free end of the first release lever 18 has a pin 2 fixedly planted in the second release lever 19(7)-i section.
1 is fitted, and the lever 19 is pivotally connected to the holding member 2 by a shaft 22, and each end is connected to pins 23 and 24 fixedly planted in the second release lever 19 and the holding member 2. The second release lever 19 is given a pivoting behavior in the direction of the arrow 26 by the elasticity of the springs 25 each having a tensioning behavior.

The elasticity of the spring 25 is set to be somewhat stronger than the elasticity of the spring 11, and the elasticity of the second release lever 1 is set to be slightly stronger than that of the spring 11.
The upper edge of 9 is brought into pressure contact with a pin 27 fixed to the holding member 2.

Furthermore, the elasticity of the spring 25 is set to be somewhat stronger than the elasticity of the spring clutch 14, so that when the detection member 11 is rotated in the direction of the arrow 12 by the paper feed table 3, the The second release lever 19 remains in pressure contact with the pin 27.

A support member 28 is pivotally attached to the second release lever 19 by a shaft (not shown), and its rotation range is restricted by a projection 19a provided on the second release lever 19.

A sheet 31 of a certain size is stacked inside the paper feed tray 3, and both the leading corners of the sheet 31 are separated by a corner separator 32.
, 33, and wing portions 34 having recesses 34a that fit into the pins 6 are fixed on both sides of the paper feed table 3, and the tip of one of the wing portions is A pressing surface 34b for pushing up the lower part of the abutting member 28 is formed.

In FIG. 2, the sheet 31 is placed on a bottom plate 35 located at the bottom of the paper feed table 3. As shown in FIG.

The paper feed roller 36 is pivotally connected to an immovable member within the paper feed device by a shaft 3T, and rotates intermittently in the direction of an arrow 38 when receiving a paper feed command.

A base portion of a pressure member 39 is fixed to the operating shaft 7, and its tip portion 39a passes through a hole 3a formed in the bottom of the paper feed tray 3 and presses the tip portion of the bottom plate 35. .

FIG. 2a shows a state in which the paper feed tray 3 is already attached to the holding members 1 and 2, and when the paper feed tray 3 is attached, the detection member 11 is moved to its free end by its tip 3b. 11a is pressed in the direction of arrow 41 and rotated by a certain angle in the direction of arrow 12.

Further, the first release lever 18 remains stationary at the original position shown in FIG. arrow 1 due to the elasticity of spring 17
Rotate in direction 3.

As a result, the pressure member 39, which is substantially integrated with the operating shaft I, presses the bottom plate 35 and pushes the uppermost part of the sheet 31 onto the paper feed roller 3.
The paper is fed by intermittent rotation of the roller 36 in pressure contact with the roller 6.

FIG. 2 shows the state in the middle of removing the paper feed tray 3, and when the rear end of the cassette 3 is lifted, the pressing surface 34b of the wing section 34 pushes up the lower part of the abutment member 28, and the second The release lever 19 is rotated in the direction opposite to the arrow 26, and the first release lever 18 interlocked therewith is rotated in the direction of the arrow 12.

As a result, the spring clutch 14 is connected, the operating shaft 7 and the pressure member 39 rotate in the direction of the arrow 12, and the uppermost part of the sheet 31 is separated from the paper feed roller 36.

Since the angle at which the rear end of the paper feed tray 3 is lifted is regulated by the recesses 4 and 5 of the holding members 1 and 2, the pressure member 39
The amount of retreat in the direction of the arrow 12 is always constant regardless of the amount of the sheet 31, and releases the pressure of the sheet 31 against the paper feed roller 36.

The detection member 11 in Figure 2 is in a state where its tip 11a is separated from the tip of the paper feed tray, but the spring 9 is tightened around the operating shaft 7 and it is substantially integrated with the same shaft 1. In addition, in FIG. 2a, the spring 9 is loose and free with respect to the operating shaft 7, but the tip 11a is pressed by the tip of the paper feed table 3. Therefore, rotation of the detection member 11 is prevented.

Next, as shown in FIG. 2C, when the paper feed table 3 is pulled out to the right in the figure, the front edge 3c of the hole 3a presses the free end 39a of the pressure member 39 and The actuating shaft 7, which is substantially integral with the actuating shaft 7, is further rotated in the direction of the arrow 12.

When the operating shaft 7 is rotated in the direction of the arrow 12, the spring 9 is loosened and twisted, so that the above-mentioned rotation of the operating shaft T can be performed freely.

When the tip of the paper feed table 3 separates from the tip of the pressing member 39, the pressing member 39 rotates a little in the direction of arrow 13 due to the elasticity of the spring 11, and the spring 9 is tightly wound around the operating shaft 7.

When the abutment member 28 comes off the pressing surface 34b and the second release member 19 rotates in the direction of arrow 26 and returns to its original position, the first release member 18 rotates and returns in the direction of arrow 13 in conjunction with this. By this, the pressure member 39 and the detection member 11
rotates by a small angle in the direction of arrow 13 and comes to rest at the position shown in FIG. 2C.

Note that even after the abutment member 28 is removed from the pressing surface 34b when pulling out the paper feed tray 3 with the retracted portion lifted, the pressure member 39 is retained by the one-way clutch function of the spring clutch 14. , the pressure member 39 can rotate in the direction of arrow 12 but cannot rotate in the direction of arrow 13.
The tip 39a can be easily removed from the hole 3a of the paper feed table 3, and is held at the lowest position pushed down by the tip of the paper feed table 3.

When attaching the paper feed tray 3 to the holding members 1 and 2, the abutting member 28 escapes in the direction of the arrow 42 to facilitate attachment of the paper feed tray 3, and when the paper feed tray 3 is attached, the support member 28 moves away in the direction of the arrow 42 to facilitate attachment of the paper feed tray 3. Figure 2a
As shown in FIG. 2, the detection member 11 rotates in the direction of arrow 12, the spring clutch 14 is released, and the sheet 31 is brought into pressure contact with the paper feed roller 36 in the same manner as described above.

Note that the same effect can be achieved by using a ratchet and a ratchet wheel instead of the spring clutch 14.

FIG. 3 shows another embodiment of the invention, in which parts performing the same functions are designated by the same reference numerals.

In the figure, the first release lever 51 is fixed to the end of the tube shaft 8, and the pin 21 of the second release lever 19 loosely passes through a long hole 51b bored in the short arm 51a. 1st
The trochanter 52 mounted on the long arm 51c of the release lever 51 is
The elastic spring 54, whose one end is locked to a pin 53 fixed to the stationary member, presses against the circumferential surface of a cam 55 that is shaft-mounted on the stationary member.

In the device shown in FIG. 3, the paper feed roller (not shown) is designed to constantly rotate after receiving a paper feed command, and in conjunction with this, the cam 55 rotates while the timing is controlled. It is rotating in the direction of the arrow.

When the paper feed tray 3 is attached to this device, the spring clutch 14 is released due to the above-described action of the detection member 11, and the pressure member 39 pushes up the bottom plate 35 of the paper feed tray 3 to push up the sheet 31. Paper is fed by being in pressure contact with a constantly rotating paper feed roller.

The trochanter 52 of the first release lever 51 is connected to the small diameter portion 55 of the cam 55.
by transferring from a to the large diameter portion 55b.

The first release lever 51 rotates in the direction of arrow 12 to connect the spring clutch 14.

Further, while the trochanter 52 is in pressure contact with the large diameter portion 55b of the cam 55, the operating shaft I and the pressing member 39 that is substantially integrated therewith are driven in the direction of the arrow 12, and the inside of the paper feed table 3 is moved. The pressure member 39 retreats by a fixed amount regardless of the loaded amount of sheets 31, and this retreating action is repeated every rotation of the cam 55 to feed out the sheets 31 one by one from the paper feed table 3. To go.

After one sheet 31 is sent out from the paper feed table 3, the paper feed roller and the sheet 31 are completely separated, so that the fed sheet 31 is not affected by the paper feed roller at all and is transferred to the next conveyance. It can be reliably transported by a device (not shown).

Further, due to the above-described action of the second release lever 19, the paper feed tray 3 can be taken in and out of the apparatus, or attached and detached from the apparatus without using an operating lever or the like, as in the embodiment shown in FIG.

FIG. 4 shows yet another embodiment of the present invention, in which parts that perform the same functions as those in the previous embodiment are designated by the same reference numerals.

In the figure, the pair of holding members 61 (one not shown) has four parts 62 and 63 perforated vertically for inserting paper feed trays, and a plurality of paper feed trays 3 (see FIG. 1) can be inserted. The second release lever 64 corresponds to the second release lever 19, and by its rotation, the recess 62
This is to release the pressure on the lower paper feed tray 3 attached to the tray.

Various members that act on the upper paper feed tray 3 inserted into the recess 63, namely an operating shaft 66 to which a pressure member 65 is fixed, a detection member 68 forming a spring clutch 67, and a spring 69.
, a first release lever 72 substantially integral with the tube shaft 71
It is provided similarly to the embodiment shown in the figures.

A pin T4 fixed to one end of the second release lever 73 is fitted into a long hole provided in the first release lever 72.
A contact member 75 is attached to the other end of the second release lever 73.

The second release lever 73 is pivotally connected to the holding member 61 by the shaft 16, and the pin 7T of the lever 73 and the holding member 61
The operating lever 13 has the ability to rotate in the direction of an arrow 81 due to the elasticity of a tension spring 79 whose ends are respectively locked to a pin 78 fixedly planted in the holding member 61 . The pin 82 is pressed into contact with the pin 82 fixedly planted in the pin 82.

Pins 91 and 92 fixed to the free ends of the second release lever 64 and the first release lever 72 are connected to the switching plate 93.
Both pass through a hole 93a provided in the knob 94.
The switching plate 93 to which the switch plate 93 is fixed is vertically movable by fitting long holes formed therein into a pair of pins 95 fixed to the holding member 61.

A recess 93b constituting a click mechanism is provided on one side edge of the switching plate 93, and the trochanter 9 in pressure contact with this recess 93b is provided.
1 is attached to one end of the two-arm member 98, and the two-arm member 98 is pivotally connected to the holding member 61 by a shaft 99, and one end is attached to a pin 101 fixed to the holding member 61. The elasticity of the locked tension spring 102 provides a rotational behavior in the direction of the arrow.

In the state shown in FIG. 4, the switching plate 93 is in the raised position, and the paper feed table 3 mounted on the upper stage is in the paper feeding state.
The upper edge of the second release lever 64 for the lower stage is connected to the pin 27.
It is in a state where it has been rotated in the direction of the arrow from its original position where it is in pressure contact with, and this position is maintained by the switching plate 93.

Therefore, since the pressure mechanism of the lower paper feed tray 3 is released when it is attached to the four parts 62, even if the upper and lower paper feed rollers (not shown) are both rotating, the lower paper feed table 3 Paper feeding action from table 3 is blocked.

To switch the paper feeding mechanism from the upper stage to the lower stage, it is sufficient to press the knob 94 and lower the switching plate 93. As a result, the second release lever 64 at the lower stage returns to its original position and the pressure member 93 is released. It becomes possible to use rotational motion to perform pressurizing action.

As a result of the upper second release lever 73 being rotated in the direction of arrow 81 and being held, the spring clutch 67
As a result of the upper stage pressure member 65 being retracted by a certain amount through the upper stage, the paper feeding action by the upper stage paper feeding mechanism is blocked.

In this paper feed switching mechanism, the pressure member 39 or 6
Since the angle for rotating the spring 5 against the spring 17 or a similar spring for the upper stage is small, the switching operation can be carried out easily and with little energy.

The loading/unloading or attachment/detachment of the paper feed tray 3 to/from the device is as follows:
It is only necessary to lift the rear part of the paper feed tray 3 and move it back and forth, and it is possible to omit the installation and operation of an operating lever.

Note that the above-mentioned paper feed switching mechanism is not limited to a two-stage paper feeding mechanism, but may also include at least one device, such as a device that combines a manual paper feeding mechanism and a paper feeding mechanism using a paper feeding tray. The present invention can also be applied to a paper feeding device including a plurality of paper feeding means including a stacked paper feeding mechanism.

According to the present invention, the pressure member that presses the bottom plate of the paper feed tray is
Regardless of the amount of sheets loaded on the bottom plate, the sheets can be moved back a certain amount to separate them from the paper feed roller, and when the paper feed tray is attached to the device, the paper feed tray can be brought into contact with the detection member. The pressure member can be pressed against the bottom plate of the paper feed tray by simply pushing it in the pressed state, and this can be done by light operation of the paper feed tray without using the operation lever of the paper feed tray for the apparatus.

By activating the pressure mechanism intermittently and pressing the topmost part of the sheet against the paper feed roller only when feeding the sheet, a constantly rotating paper feed roller can be applied to the bottom plate pressure type paper feed device. Paper can be fed.

Furthermore, in the case of having multiple paper feeding means, by retracting the top of the bottom plate of the unselected paper feeding table by a certain amount regardless of the amount of sheets, the unselected paper feeding rollers can be prevented from rotating. However, the paper feeding action caused by this is prevented, and the amount of rotation of the pressure member is required to be small when switching the paper feed as described above, so that the operation for switching the pressure mechanism can be lightened.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a paper feeding device showing one embodiment of the present invention, FIG. 2 is an operational view of the same, FIG. 3 is a perspective view of a paper feeding device showing another embodiment of the invention, and FIG. 4 FIG. 2 is a perspective view of a paper feeding device showing still another embodiment of the present invention. 1.2...Holding member, 3...Paper feeder, 7°66...Operating shaft, 14,67...
・Spring clutch, 8, 71...Tube shaft, 1
7... Spring member, 18... First release lever, 19, 64, 73... Second release lever,
11.68...Detection member, 31...Sheet, 35...Bottom plate, 36...Paper feed roller, 39,65... Pressure member, 93...
...Paper feed switching board.

Claims (1)

[Claims] 1. In an apparatus having at least one stacked paper feeding mechanism, a cassette holding section is provided on both sides of the cassette attachment/detachment section for regulating the lifting angle of the end of the attached cassette. a second release lever that is swingably supported by the holding member and has a pressing portion that is pressed by the rear end of the cassette when the cassette is lifted; A first release lever whose one end engages with the release lever and is interlocked with the release lever; an actuation shaft coupled to the first release lever via a clutch provided coaxially with the release lever; and the actuation shaft. and a member having one end fixed to the actuating shaft and having a tendency that the pressure member on the same axis comes into pressure contact with the lower surface of the cassette mounting part, and the holding member By lifting the rear end of the cassette within the range regulated by the cassette holding part, the first release lever is swung through the second release lever, and the pressure member is moved through the actuating shaft interlocked with the first release lever. A paper feeding device characterized in that the paper is retracted from the lower surface of a sheet loading section of a cassette. 2. In an apparatus having at least one stacked paper feeding mechanism, a holding member that is disposed on both sides of the cassette attachment/detachment section and is formed with a cassette holder for regulating the lifting angle of the attached cassette l end. a second release lever that is swingably supported by the holding member and has a pressing portion that is pressed by the rear end of the cassette when the cassette is lifted; one end engages with the second release lever; a first release lever that is interlocked with the first release lever; a first release lever that has one end engaged with the second release lever and that is interlocked with the second release lever; and a spring clutch that is provided coaxially with the first release lever. An actuating shaft is connected to the lever through the lever, a pressure member is fixed to the actuating shaft, and the pressure member, which is coaxial with one end fixed to the actuating shaft, is connected to the cassette mounting section. a member having a tendency to come into pressure contact with the lower surface; and a detection member integrally disposed on the side of the operating shaft that engages with the spring clutch so as to engage with the clutch, the detection member being a cassette. A sheet feeding device characterized in that when the sheet collides with the leading end of the cassette, a pressure member fixed to an operating shaft is brought into pressure contact with a lower surface of a sheet loading portion of a cassette by the loosening action of a clutch.