JPS6283932A - Paper feeding device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a paper feeding device that can be inserted manually into a copying machine, a printer, or the like.

Conventional paper feed devices for copiers, printers, etc. have a stack of paper on a paper feed pressure plate whose rear end is pivoted to the bottom of the paper feed tray and whose bottom surface near the front end is pressed and released by a pressure lever. A paper feed roller is provided on the main body of the device so that the front edge of the top surface of the paper stack comes into contact with each other when the paper stack is placed and pressurized. A paper feed roller provided with a frictional separation member that can be moved toward and away from the paper feed roller is widely used because it has a simple structure and a reliable separation effect.

By the way, in the paper feed device of a copying machine or printer, you may want to feed paper of a different size or quality than the paper loaded in the paper feed tray, or special paper such as thick paper or envelopes that cannot be separated with a friction separation member. cases often occur. In such cases, paper is manually fed one by one, but in the paper feeder configured as described above, conventionally, a manual paper feed port is provided in the main body of the device, completely separate from the paper feed tray that normally feeds paper. Since the paper feed roller and the guide member are provided separately, the paper occupies a large space, which increases the size of the device and increases the cost.

Purpose The present invention eliminates the above-mentioned drawbacks of the conventional device that manually feeds paper using a paper feeder that utilizes frictional separation. It is an object of the present invention to provide a paper feeding device with a simple configuration that can be used.

Structure In order to achieve the above object, the present invention provides a paper feeding device including a paper feeding pressure plate, a paper feeding roller, and a frictional separation member that can come into contact with and separate from the paper feeding pressure plate. It is swingably supported by a shaft provided at right angles, and the lower surface near the front end is attached to the upper surface of the paper feeding pressure plate or the top surface of the paper bundle placed thereon when pressure is applied, and to the front end wall of the paper feed tray when pressure is released. A manual feed guide plate that contacts the upper edge with its own weight and has a notch in the area of the paper feed roller, and a manual feed paper leading edge regulating member that protrudes into the conveyance path of the paper manually fed onto the prosthetic manual feed guide plate and is retractable. It is characterized by having.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention. In the paper feed device 4 of this embodiment, a paper feed pressure plate 9 whose rear end is pivoted to the bottom of the paper feed tray 1 is provided in the front half of the paper feed tray, and the paper feed pressure plate 9 is operated by the operator. The pressurizing lever 8 operated by the hand of the user is pushed up from the position A in the figure to the position i via the intermediate lever 10. At the upper part of the front end wall of the paper feed tray 1, a paper feed roller 2 is pivotally supported by the main body of a printer or copying machine, and a paper feed pressure plate 9 is pushed up by a pressure lever 8 via an intermediate lever 1o. The front end of the upper surface of the stack of sheets placed thereon comes into pressure contact with the paper feed roller 2, and when the paper feed roller 2 rotates a certain amount in response to a paper feed signal, the sheets are sequentially fed out from the top. A friction member 3 is provided at a position immediately after the sheet pressing position of the sheet feeding roller 2 so as to be able to press against and detach from the peripheral surface of the sheet feeding roller 2 . The intermediate lever 10 is supported near one end by a support shaft 16 provided on the lower surface of the bottom plate of the paper feed tray 1, and projects into the lower surface of the paper feed pressure plate 9 through a long hole 17 provided at the other end. A pin 19 at the tip of the provided arm 18 is engaged. The tips of arms 21 and 22 fixed to a shaft 20 rotated by the pressure lever 8 can be secured to the lower surface of the intermediate lever 10 near the fulcrum 16. A paper feed pressure spring 11 is tensioned between an arm protruding from the lower surface near the fulcrum of the intermediate lever 10 and near the front end of the lower surface of the paper feed tray 1. Paper feeding pressure is applied between the paper and the paper feeding roller 2.

The configuration described so far is no different from the conventional friction separation type paper feeding device.

However, in this paper feeder 4, according to the present invention, the bearings provided on the upper edges of both side plates of the paper feed tray 1 are provided in the four parts 24.
The manual feed guide plate 5 is supported by shafts fixed to both sides.
is swingably provided. The center of gravity of the manual feed guide plate 5 is located ahead of the pivot point 24, and its front end is located slightly ahead of the front end wall of the paper feed tray 1. Further, the front end of the paper feed roller 2 and the friction member 3 are notched. The front end of the manual feed guide plate 5 is lightly pressed against the upper surface of the stack of sheets by its own weight. However, since a notch is provided at the front end of the manual feed guide plate 5 in the range of the paper feed roller 2 and the friction member B, the upper end of the paper stack is directly pressed back onto the paper feed roller 2, and this As in the conventional apparatus, the sheets sent out are separated in double feed by the friction member 3. Further, when the paper feed pressure plate 9 is lowered by the pressure lever 8, the front end of the manual feed guide plate 5 is supported by the upper edge of the front end wall 1a of the paper feed tray 1, and the upper surface and the paper feed pressure plate 9 are lowered, as shown in FIG. A slight gap is created between the paper roller 2 and the surface of the paper roller 2, and the friction member 3 is separated from the paper feed roller 2, forming a manual feeding path 7. Manual feed conveyance path Manual feed paper is inserted into the manual feed conveyance path 7 along the upper surface of the manual feed guide plate 5 through the manual feed port 23 formed between the manual feed guide plate 5 and the upper edge of the paper feed port of the main body of a device such as a printer. In order to position the leading edge of the paper in the case of
It is pivotally supported at the front lower part of the front end wall 1a of the paper feed tray 1 so as to be swingable. As shown in FIG. 2, when the paper feeding pressure plate 9 is lowered, the front end of the paper leading end regulating member 6 pushes down the horizontal arm, and the vertical arm's leading end protrudes into the manual feeding path Z as shown by the solid line. When the paper reaches the paper leading edge regulating position and the paper feed pressure plate 9 rises, the paper leading edge regulating member 6 rotates counterclockwise under its own weight, and the tip of the vertical arm moves away from the manual feeding path 7, as shown by the broken line in the figure. evacuate.

Further, the mechanism for press-contacting and separating the friction member 3 from the paper feed roller 2 is as follows. FIG. 3 is a view of the front end of the paper feed tray seen in the direction of the arrow of the line ■-■ in FIG. wall 1
It is attached to the upper surface of a friction member support base 12 which is joined by a pin 26 to one end of the separation pressure lever 13 which is pivotably supported on a support shaft 25 implanted in a member 30 fixed to a member 30. A separation pressure spring 14 is tensioned between an upwardly protruding protrusion on the end of the separating pressure lever 13 opposite to the bottle 26 and a downwardly protruding protrusion of the fixing member 30.
As a result, separation pressure is applied between the friction member 3 and the paper feed roller 2. The lower end of the friction member support is bent at a right angle to form an engaging portion 12a. As shown in FIG. 4, on the upper surface of the engaging portion 12a, a protrusion 27 that is pushed down by the lower surface of the sheet feeding pressure plate 9 when it is lowered is provided so as to protrude through a binding hole provided in the bottom plate of the sheet feeding tray. , the front end of a separation pressure release plate 15 whose rear end is pivotally connected to the bottom plate of the paper feed tray is engaged. Therefore, when the paper feed pressure plate 9 is lowered, as shown by the chain line in FIG. The member 3 is separated from the paper feed roller 2. When the paper feed pressure plate 9 is raised, the friction support base 12 is raised by the force of the separation pressure spring 14, and the friction member 3 is pressed against the paper feed roller 2 with a predetermined separation pressure. Along with this, the separation pressure release plate 15 is also moved to the position shown by the solid line in FIG.

Therefore, when manually feeding paper, when the pressure lever 8 is operated to lower the paper feed pressure plate 9, the gap between the manual feed guide plate 5 and the paper feed roller 2 and between the paper feed roller 2 and the friction member 3 is reduced. The paper is spaced apart to form a manual feeding path, and the leading edge of the paper leading edge regulating position B protrudes into the manual feeding path, so insert the paper through the manual feeding port 23 until the leading edge hits the regulating member B.

Next, when the paper feed pressure plate 9 is pushed up using the pressure lever 8,
The paper feed pressure plate 9 or the upper surface of the paper bundle placed thereon pushes up the manual feed guide plate 5, and the leading edge of the manual feed paper placed thereon is pressed against the paper feed roller 2. As the paper feed pressure plate 9 rises, the friction member 3 comes into pressure contact with the paper feed roller 2 via the leading edge of the manually fed paper, and the paper leading edge regulating member 6 retreats.

Then, when the paper feed roller 2 is rotated by the paper feed signal, the manual paper is fed.

In the above embodiment, the pressing and releasing of the friction member 3 and the retreating and protruding of the paper leading end regulating member are linked to the pressurizing and releasing of the paper feed pressure plate by the pressure lever. When it detects that the sheet has been inserted, the friction member is released, the leading edge regulating member is made to protrude, and when it is detected that the leading edge of the paper has been inserted to a predetermined position where it contacts the regulating member, the friction member is pressed against the leading edge regulating member. It is also possible to evacuate.

Effects As described above, according to the present invention, a normal paper feed port and paper feed member can be used for manual paper feeding, so that it is possible to avoid an increase in the size and cost of the apparatus.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the configuration of an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the vicinity of the front end of the paper feed tray in detail, and FIG. 3 is the direction of the arrow of the ■-■ line in FIG. FIG. 4 is an explanatory diagram illustrating the separation pressure release mechanism of the friction member. 1...Paper feed tray 2...Paper feed roller 3...
・Friction member 4...Paper feeding device 5...Manual feed guide plate 6...Paper leading edge regulating member 7...Manual feed conveyance path 8...Pressure lever 9...Paper feed pressure plate Fig. 4 Zd

Claims (2)

[Claims] (1) A paper feed pressure plate whose rear end is pivotally attached to the bottom of the paper feed tray, whose lower surface near the front end is pressurized and released by a pressure lever, and whose upper surface places a stack of paper; In a paper feeding device, the paper feeding device includes a paper feeding roller provided on the main body of the device so that the front end of the top surface of the stack of paper sheets placed in pressure contact with each other, and a friction separation member that can come into contact with and separate from the paper feeding roller at a position immediately after the pressure contact position, It is swingably supported on a shaft provided above the paper feed pressure plate at right angles to the paper feeding direction, and when the paper feed pressure plate is pressurized, the bottom surface near the front end is on the top surface of the pressure plate or the top surface of the paper stack placed thereon. , when the pressure is released, it comes into contact with the upper edge of the front end wall of the paper feed tray under its own weight,
The sheet feeder further comprises: a manual feed guide plate having a notch in the area of the paper feed roller; and a manual paper leading end regulating member that projects into and can be retracted into a conveyance path for sheets manually fed onto the manual feed guide plate. Device. (2) Claims characterized in that the pressing and releasing of the friction separation member and the releasing and protruding of the manual paper leading end regulating member are performed in conjunction with the application and release of paper feeding pressure by the pressure lever. The paper feeding device according to item 1.