JPH0418986Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] A paper feeding device such as a printer device that prints on cut sheets, which includes a sub-feeding roller that rotates in conjunction with the feeding roller in the same direction as the feeding roller, and presses the leading end of the cut sheet against the feeding roller. By providing a stop member for stopping the pressing member at a predetermined position, it is possible to stably feed out the cut sheet and reduce skew feeding.

[Industrial application field]

The present invention relates to a paper sheet feeding device for a printer device that uses cut sheets, and more particularly to a paper sheet feeding device that can stably feed cut sheets and prevent skewing.

In recent years, various printers have been developed and put into practical use as print output devices for various office computers, word processors, and the like.

As these printer devices are used more frequently for document printing due to advances in office automation, printers that can automatically feed cut sheets (hereinafter referred to as printing paper) in addition to the conventionally widely used continuous paper have become popular. I've been doing it.

This printing paper is used by automatically feeding out one sheet at a time from a stack of dozens of sheets and transporting it to the printing section, but it is stable even when the type of printing paper or the number of sheets in the supply section changes. There is a need for a mechanism that allows for accurate feeding and prevents skewing.

[Conventional technology]

The conventional method will be explained with reference to FIGS. 4 to 8. FIG. 4 is a plan view illustrating the outline of a wire dot printer, FIG. 5 is a side view illustrating a printing paper feeding device mounted on the wire dot printer, FIG. 6 is a side view showing a conventional example, and FIG. 6
8 is an explanatory view of FIG. 6, which is a view taken in the direction of arrow D in the figure.

As shown in FIG. 4, a platen 2 is rotatably supported on a side frame 1, and a printing paper 3 fed from a paper feed section (not shown) is attached to the platen 2.
A is wrapped around it.

Below in the figure of the platen 2 is a guide shaft 6 with a carrier 5 provided parallel to the platen 2.
The lead screw 7 is slidably fitted into the
It is screwed together. The feed screw 7 is connected to a motor 9 via a belt 8 or the like, and the carrier 5 can be moved in the directions of arrows A and B in the figure by forward and reverse rotation of the motor 9.

A ribbon cassette 10 is mounted on the carrier 5, and an endless ink ribbon 10a is built into the ribbon cassette 10 with a part thereof exposed to the platen 2 side.

Furthermore, a print head 11 is provided in the carrier 5, surrounded by the ribbon cassette 10, and facing the platen 2 with a gap in between. Built-in printing magnet with printing wire.

Further, as shown in FIG. 5, a sensor _S1 is arranged at the upper left of the platen 2 located on the left side to detect the upper end of the printing paper 3a and determine the printing start position. 12a contacts the feed roller R1 via the printing paper ₃ and holds the printing paper 3a so that it does not loosen. Platen 2
Paper guides 13 to 16 are arranged around and to the right of the platen 2, and a sensor _S2 is arranged at the upper right of the platen 2 to detect the presence or absence of printing paper 3a. feed roller
_R2 is provided.

A presser roller R ₃ contacts the platen 2 through a square hole (not shown) in the paper guide 13 via the printing paper 3a. The feed rollers R ₁ , R ₂ and the platen 2 are connected to the printing paper 3a by drive limits (not shown).
Rotates in conjunction with the feeding direction. Feed roller R ₂
A paper feed section 4a is provided behind the paper feed section 4a, and a paper storage section 17 is provided at the upper left of the paper feed section 4a in the drawing.

To explain the mechanism of the paper feed section 4a with reference to FIGS. 6 and 7, both ends are side frames 42a and 42b.
The frame 41 supported by the frame 41 has elongated holes 41a, 41
A pair of paper guides 43a, 43b are slidably attached to the elongated holes 41a, 41b by engagement with protrusions 44a, 44b provided on the lower surface thereof.

A side frame 42a parallel to the frame 41,
Feeding rollers R _4a and R _4b made of a rubber material, for example, are provided on a square shaft 45 supported by the shaft 42b, and the square shaft 45 is connected to a motor (not shown) via a clutch. Also, the feeding roller R _4a ,
R _4b is movable in the axial direction.

The paper guides 43a and 43b each have an L-shaped portion, and are positioned with their horizontal portions facing each other. Also, one end of the paper is rotatably attached to the horizontal portions of 43a and 43b, and the other end is attached to the compression spring 46a and 46b.
A pair of press plates 47a and 47b are provided which are biased in the direction of the feed rollers R _4a and R _4b by the pressure rollers R 4a and R 4b.

A pressing plate 47 is provided on the lower surface of the pressing plates 47a and 47b.
a, 47b, and is slidably connected to the press plate 47.
A holding plate 40 is attached to hold the printing paper 3a when the printing paper 3a is set on the printing paper 3a and 47b.

Therefore, the paper guides 43a, 43b can be slid on the frame 41 in accordance with the width of the printing paper 3a used to set the desired distance between the vertical portions, and at this time, the pressing plates 47a, 47b
slides on the holding plate 40, and also the feeding roller
R _4a and R _4b also move. Compression springs 46a, 46b
Receiving parts 48a and 48b are attached to the upper end and touch the lower surface of the holding plate 40, and the lower end is attached to the paper guide 43.
They are housed in receiving portions 48c and 48d provided at portions a and 43b.

Separators 49a and 49b rotatably supported at a fulcrum b below the feeding rollers R _4a and R _4b are supported by the feeding rollers by compression springs 50a and 50b.
Lightly touching R _4a and R _4b . Separator 49
The contact surfaces of a and 49b are covered with rubber material,
It has a function of preventing double feed of the printing paper 3a.

Furthermore, separator covers 51a and 51b are provided from the right side to the bottom of the separators 49a and 49b. The separator covers 51a and 51b also have the function of abutting the printing paper 3a when setting it.

With such a structure and function, after the pressing plates 47a and 47b are moved downwardly away from the feeding rollers R _4a and R _4b against the elasticity of the compression springs 46a and 46b using a lever (not shown), the normal number of steps are performed. Insert ten sheets of printing paper 3a between the paper guides 43a and 43b until they hit the separator covers 51a and 51b, and then release the lever to release the compression spring 4.
Pressing plates 47a, 47b due to the elasticity of 6a, 46b
feeds out the leading edge of the printing paper 3a and roller R _4a ,
Press R _4b .

The feeding rollers R _4a and R _4b are driven by the printing command to feed the printing paper 3a, and when the sensor S ₂ detects the printing paper 3a, the driving of the feeding rollers R _4a and R _4b is stopped and the second sheet is printed. Paper 3a is not fed out. At this time, the printing paper 3a is fed by the feeding rollers R ₁ and R ₂ and the platen 2, and when the sensor S ₁ detects the leading edge of the printing paper 3a, the feeding stops.

Then, the printing head 11 shown in FIG. 4 starts operating, and the printing wire of the printing magnet collides with the printing paper 3a on the platen 2 via the ink ribbon 10a to perform printing, and the printing head 11 and the carrier 5 Printing is performed while moving in the direction of arrow A. When one line of printing is completed, the feed roller _R1 ,
R ₂ and the platen 2 are driven to move the printing paper 3a by a predetermined feed amount in the direction of arrow C to perform a line feed, and the print head 11 continues printing while moving in the direction of arrow B.

When printing for one page is completed, print paper 3a
is sent out and stored in the paper storage section 17.

When the next page is to be printed, the printing paper 3a is fed out and wrapped around the platen 2 in the same manner as described above, and printing is started.

[Problem that the invention attempts to solve]

According to the above-mentioned conventional method, since feeding is performed by a pair of left and right feeding rollers R _4a and R _4b , skew feeding tends to occur in feeding the printing paper 3a.

As shown in FIG. 8a, if the printing paper 3a has curls in a convex direction, the leading edge of the printing paper 3a will be exposed to the separator covers 51a, 51a and 5b when it is fed out.
It may hit the upper end of 1b and cause a feeding failure.

As shown in FIG. 8b, pressing plates 47a, 47
b rotates around point a of paper guides 43a and 43b, and the set printing paper 3a is pushed up from abutment surface c of separator covers _51a and 51b to contact point d with feed rollers R4a and _R4b . When the printing paper 3a is running low, or when the printing paper 3a is thick paper such as a postcard, or an envelope, sufficient contact with the feeding rollers R _4a and R _4b necessary for feeding cannot be obtained, and feeding becomes unstable. .

There is a problem.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the present invention.

In the figure, R ₄ is a feed-out roller whose rotation is controlled, 47 is rotatably attached at one end to the bottom of the paper feed section 4, and the other end is urged in the direction of the feed-out roller R ₄ by an elastic member 46. A pressing member _R5 is attached to the other end of the bracket 20, one end of which is rotatably supported on the axis of the feed roller _R4 , and is in contact with the upper surface of the paper sheet 3 behind the feed roller _R4 , A sub-feeding roller 26, which rotates in conjunction with the rotation of the roller _R4 , is a stop member that defines the minimum gap between the pressing member 47 and the feeding roller _R4 . This stop member 26 stops when the number of paper sheets 3 decreases.
The rotation of the pressing member 47 is restricted to prevent the tip of the pressing member 47 from coming into contact with the delivery roller _R4 .

Therefore, the paper sheets 3 are pressed by the pressing member 47 against the feeding roller R ₄ and by the weight of the sub-feeding roller R ₅ from the upper surface, and when the number of sheets 3 decreases, the pressing plate 47 is configured to be stopped by a stop member 26.

[Effect]

The paper sheets 3 set in the paper feed section 4 are pressed against the feeding roller _R4 by the pressing member 47, and
It is pressed from above by the weight of the sub-feeding roller _R5 , and fed out by the interlocking rotation of the feeding roller _R4 and the sub-feeding roller _R5 , so feeding is stabilized and the amount of skew is reduced. Further, the amount of the paper sheet 3 decreases as it is fed out, and the pressing member 47
When the paper sheet 3 is stopped by the stop member 26, the contact force between the paper sheet 3 and the feeding roller _R4 becomes weaker, and the feeding is mainly performed by the sub feeding roller _R5 . Stable feeding is possible even when the paper is curled, or when paper such as postcards or envelopes are used.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 and 3. FIG. 2 is a partially cutaway side view of an embodiment of the present invention, and FIG. 3 is a view taken in the direction of arrow D in FIG. The same reference numerals indicate the same objects throughout the figures.

As shown in Fig. 2, the main feeding roller section 1
8 is feeding rollers R _4c , R _4d and gears 19a, 19b
It is made up of. The main feeding roller section 18 rotates around a square shaft 45, and feeds out rollers R _4c ,
Brackets 20a and 20b are rotatably attached to the small diameter portion of _R4d . Bracket 20a,
Sub-feeding roller portions 21a, 2 are provided at the tip of the roller 20b.
1b, coaxial gears 22a,
22b and sub-feeding rollers R5 _a and R5 _b .

Gears 22a, 22b are connected to brackets 20a, 20
gears 19a, 19b via idle gears 23a, 23b rotatably attached to the center of b.
is connected to. Therefore, gears 19a, 19b, 2
2a and 22b rotate in the same direction, and by driving the square shaft 45, the feeding rollers R _4c and R _4d and the sub feeding rollers R5 _a and R5 _b rotate in the same direction.

Bending protrusions 24a, 24b are provided at the tips of the brackets 20a, 20b, and the paper guide 43
The sub-feeding rollers R5 a and R5 b are engaged with the rectangular elongated holes 25 a and 25 b provided in the holes 25 a and 43 d to prevent the sub-feeding rollers R5 _a and R5 _b from falling down to the pressing plates 47 a and 47 b. This is because when setting the printing paper 3a, the leading edge of the printing paper 3a touches the sub-feeding rollers _R5a , R5b _.
This is to prevent it from hitting you.

In addition, paper guides 43c and 43d are provided with printing paper 3.
When the loading capacity of a decreases, the pressing plates 47a, 4
The stoppers 26a, _26b which stop the rising so that the rollers 7b do not come into contact with the feeding rollers R4c, _R4d , and the stoppers _26a , 26b which define the minimum gap between the press plates 47a, 47b and both feeding rollers _R4c , R4d are cut and bent. It is molded. Therefore, when the print paper 3a is running low, the load torque for feeding is reduced.

With such a structure and function, when feeding out the printing paper 3a set between the paper guides 43c and 43d of the paper feed section 4b, the square shaft 4
5, the feeding rollers R _4c and R _4d and the sub feeding rollers R5 _a and R5 _b rotate in the same direction.
The feeding rollers R _4c and R _4d are the main ones, and the sub-feeding rollers R5 _a and R5 _b function as subordinates, but since the printing paper 3a is fed in two pairs on the left and right, the amount of skew of the printing paper 3a is limited. decreases significantly.

Also, when the printing paper 3a becomes less, the press plate 47
The side portions of sheets a and 47b engage with stoppers 26a and 26b to stop, and at the initial stage of feeding, sub-feeding rollers R5 _a and R5 _b are the main feeders, and the leading edge of printing paper 3a is fed out by feeding rollers R _4c and R. When it is caught between _4d and separators 49a and 49b, the feeding roller R _4c ,
R _4d is played mainly.

Therefore, the load torque applied to the feeding rollers R _4c and R _4d is reduced, and the curling of the printing paper 3a, which is curled in the convex direction, is reduced, thereby preventing feeding failures. Can be rolled out.

[Effect of idea]

As explained above, according to the present invention, it is possible to stably feed out paper sheets that are curled in a convex direction, paper sheets such as thin paper, cardboard, envelopes, etc.

The amount of skew can be reduced.

Load torque can be reduced.

There is an effect.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a partially cutaway side view of an embodiment of the present invention, Fig. 3 is a view taken in the direction of arrow D in Fig. 2, and Fig. 4 is a diagram showing the principle of the present invention. A plan view illustrating the outline of the applied wire dot printer; FIG. 5 is a side sectional view showing the feeding device of FIG. 4;
FIG. 6 is a side view showing the conventional method, FIG. 7 is a view taken in the direction of arrow D in FIG. 6, and FIG. 8 is an explanatory view of FIG. In the figure, 3a, 3 are printing paper, 4, 4a,
4b is a paper feeding section, 18 is a main feeding roller section, 1
9a, 19b, 22a, 22b are gears, 20, 2
0a and 20b are brackets, 21a and 21b are sub-feeding roller parts, 23a and 23b are idle gears, 26 is a stopper member, 26a and 26b are stoppers, 43a to 43d are paper guides, 45 is a square shaft, 46 is an elastic member, 46a, 46b, 49a,
49b is a compression spring, 47 is a pressing member, 47a, 4
7b is a pressing plate, 50a, 59b are separators, 5
1a and 51b are separator covers, R ₄ , R _4a to R _4d
indicates a feeding roller, and R ₅ , R5 _a , and R5 _b indicate sub-feeding rollers.

Claims (1)

[Claims for Utility Model Registration] A feed-out roller R ₄ whose rotation is controlled; and a feed-out roller R 4 rotatably attached to the bottom of the paper feed section 4 and biased in the direction of the feed roller R ₄ by an elastic member 46. The press member 47 presses the sheet 3 set in the paper feed section 4 against the feed roller R4, and the sheet is rotated by the rotation of _the feed roller _R4 . In a device for feeding out paper sheets 3 one by one, a bracket 20 is attached to the other end of the bracket 20, one end of which is rotatably supported on the shaft of the feeding roller _R4 , and the bracket 20 is attached to the other end of the bracket 20, which is rotatably supported on the shaft of the feeding roller _R4 , A sub-feeding roller _R5 that is in contact with the upper surface and rotates in the same direction as the rotation of the feeding roller _R4 , and a stop member 26 that defines a minimum gap between the pressing member 47 and the feeding roller _R4 , Roller R ₄ and sub-feeding roller R ₅
A paper sheet feeding device characterized in that the paper sheet 3 is fed out by rotation of the paper sheet 3.