JPS6351225A - media feeder - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Summary] A media feeding mechanism that performs printing, etc. by feeding out the force (7 sheets) applied to the feeding roller by means of intermittent rotation of the feeding roller, and is capable of printing, etc. By retracting the pressing plate in a direction that reduces the pressing force of the pressing plate at the timing when the feeding force of the feeding roller becomes effective, the load of feeding the medium is reduced.

[Industrial application field]

The present invention relates to a medium feeding device for a printer device that uses cut sheets, and more particularly to a medium feeding device that can reduce the load of feeding out cut sheets.

Recently, various printers have been developed as printing output devices for various office computers, word processors, etc.

It has been put into practical use.

As these printers have become more frequently used for document printing due to advances in office automation,
The use of automatically fed cut sheets to replace the continuous paper currently in use is becoming a problem.

These cut sheets are set in the paper feed section and automatically fed out one by one and fed to the printing section.
There is a need for a mechanism that can reduce the load of feeding paper immediately after it is fed from the paper feeder, and can prevent skewing, wrinkles, etc. by smooth feeding.

[Conventional technology]

FIG. 5 is a plan view showing an outline of a wire tod printer to which the present invention is applied, and FIG. 6 is a side view of FIG. 5.

As shown in FIG. 5, the platen 2a is attached to the side frame 1.
is rotatably supported, and a cut sheet 3a fed out from a paper feed section 4, which will be described later, is wound around the platen 2a. Below the platen 2a in the figure, a carrier 5 is slidably fitted into a guide shaft 6 provided parallel to the platen 2a, and is similarly screwed into a feed screw 7. The feed screw 7 is connected to a motor 9 via a belt 8 etc., and the carrier 5 is moved in the direction of arrow A in the figure by forward and reverse rotation of the motor 9.
, can be moved in the B direction.

A ribbon cassette 10 is mounted on the carrier 5, and an endless ink ribbon 10a is housed therein with a portion thereof exposed to the platen 2a side. A print head 11 is provided on the carrier 5 and faces the platen 2a with a gap therebetween.
The print head 11 has a built-in print magnet having a print wire (not shown) in order to form a print using dots.

Further, as shown in FIG. 6, a sensor S is disposed at the upper left of the platen 2a to detect the upper end of the cut sheet 3a and determine the printing start position, and a leaf spring 12a attached to the presser plate 12 is connected to the cut sheet 3a. feed roller R6 via
The cut sheet 3a is held down so that it does not come into contact with the cut sheet 3a and loosen. Vapor guides 13 to 16 are arranged around and to the right of the platen 2a, a sensor S2 for detecting the presence or absence of the cut sheet 3a is arranged at the upper right of the platen 2a, and a feed roller is placed between the vapor guides 14 and 16. R2
□ and a presser roller R4 are provided. Presser rollers R0 and R3b are in contact with the platen 2a via cut sheets 3a through square holes (not shown) in the vapor guide 13. The platen 2a, feed roller Rea+, and feed roller R5 are rotated in forward and reverse directions in conjunction with each other by a drive source (not shown).

Feed roller l? A paper feed section 4 is provided behind the za,
A paper storage section 17 is provided at the upper left of the paper feed section 4 in the figure. The paper feed section 4 has a pair of left and right paper guides 41a, 4.
1b, a feeding roller R611 made of a rubber material, for example.
+R611+ and press plates 43a, 43b urged upward by springs 42a, 42b, and separators 45a, 45b having springs 44a, 44b.
It consists of

One-way clutch 4 is installed on the feeding rollers R6a+R6b.
6a and 46b are provided and connected to the motor via an electromagnetic clutch (not shown).

The contact surfaces of the separators 45a and 45b are covered with a rubber material and have the function of preventing double feeding of the cut sheet 3a that has been fed out.

Therefore, due to the page feed command, the feeding rollers R61+R6b
When the cut sheets 3a are fed out one by one by the drive of the feed roller R2□ and the platen 2a are driven, the cut sheets 3a are sent to the feed roller Ram. □, R5, stops driving, and the second cut sheet 3a is not fed out.

The fed cut sheet 3a is wound around the platen 2a, and when the sensor S detects the leading edge of the cut sheet 3a, feeding is stopped and the cut sheet 3a is set as shown in the figure.

Then, the print head 11 starts operating, and the print wire of the print magnet collides with the cut sheet 3a on the platen 2a via the ink ribbon 10a to perform printing, and the print head 11 moves in the direction of arrow A together with the carrier 5. Print while doing so. When printing for one line is completed, the feed roller R23 and the platen 2a are driven to move the cut sheet 3a by a predetermined feed amount in the direction of arrow C, a line feed is performed, and the printing plate 11 is moved in the direction of arrow B. Continue printing m times.

When printing for one page is completed, the cut sheet 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 2a in the same manner as described above, and printing is started.

[Problem that the invention seeks to solve]

According to the above conventional method, after the cut sheet 3a passes the presser roller Rffa, the feeding rollers 46a and 46b stop, and the load from the springs 42a and 42b is applied to the rear part of the cut sheet 3a, so that the feeding force of the cut sheet 3a is reduced. This has to be supplemented by the feed roller Ram, and there is also the problem that skew and wrinkles occur due to the feeding of the feed roller R2i.

[Means for solving problems]

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

In the figure, R is a feed-out roller whose rotation is controlled, 2 is a transfer roller whose rotation is controlled in conjunction with the feed-out roller R in the same direction, and 43 is rotatably attached to the bottom of the paper feed section.
The pressing member 20, which is urged in the direction of the feeding roller R by the elastic member 42, presses the pressing member 43 at the timing when the feeding force of the transfer roller 2 that transfers the sheet 3 fed out by the feeding roller R becomes effective. This is an evacuation means for evacuation in a direction that reduces pressure.

Therefore, when the paper sheet 3 is fed out by the feeding roller R and transported by the transfer roller 2, the pressing member 43 is configured to be retreated by the retreating means 20 in a direction that reduces the pressing force.

[Effect]

The paper sheet 3 which is pressed against the feeding roller R by the pressing member 43 by the elastic member 42 is fed out by the rotation of the feeding roller R, and the tip of the paper sheet 3 is transferred to the transfer roller 2.
By retracting the pressing member 43 by the retracting means 20 at the time when the feeding force becomes effective, it is possible to reduce the load on the transport roller 2 for transporting the paper sheet 3.
It is possible to prevent the occurrence of skew, wrinkles, etc.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 to 4. 2 is a side view showing an embodiment of the present invention, FIG. 3 is an explanatory diagram of FIG. 2, and FIG. 4 is a timing chart of FIG. 2. The same reference numerals indicate the same objects throughout the figures.

As shown in FIG. 2, the feeding roller R6! Cams 20a and 20b that rotate in conjunction with the feeding roller R6111R6b are provided on the shaft 19 of +R6b.

Each of the cams 20a and 20b is a feeding roller Rb'arRb.
b, and in a state where the shaft 19 rotates and the cams 20a, 20b are not in contact with the pressing plates 43a, 43b, the feeding roller R6m rotates by a predetermined rotation angle θ8.
+R6b feeds out the cut sheet 3a, and when the cams 20a and 20b rotate the predetermined rotation angle θ2, the cams 20a and 20b move the press plate 4
3a, 43b and press. Therefore, the pressing plate 43a
, 43b in the direction of arrow A in the figure and in the direction of E.

Furthermore, the feed roller R2□ and the press roller R4 described in the conventional example have been removed.

With such a configuration, the cams 20''a and 20b are at the positions shown in the figure immediately before the feeding rollers R1+ll+R6b move one step in response to a page change command.As shown in FIG. 4, the feeding rollers R6□ , R4, and the cut sheet 3a is fed out to a position where the leading edge is transferred by the platen 2a and the presser roller R3m. At this time, the cams 20a and 20b are in the position shown in FIG. The pressing plates 43a, 43b are retracted in the direction of the arrow against the elastic force of the plates 42a, 42b.

Further, the cams 20a and 20b rotate, as shown in Fig. 3(b).
As shown in the figure, the pressing plates 43a and 43b are retracted to the retraction amount a, and the pressing plates 43 by the springs 42a and 42b are
a, cut sea of 43b) Release the load applied to 3a.

The cut sheet 3a, which is no longer loaded with pressure +ff143a and 43b, is easily attached to the platen 2a and the presser roller R3N+.
It can be transferred only by the transfer force of R3b.

The next feeding of the cut sheet 3a is performed by rotating the cams 20a and 20b in the state shown in FIG. 3 (bl) in the same direction to bring them into the state shown in FIG.

Further, vibrations, displacement, etc. of the cut sheet 3a that may occur when the cams 20a, 20b are separated from the pressing plates 43a, 43b can be prevented by smoothing the displacement curves of the cams 20a, 20b.

In this way, the cut sheet 3 is cut by a simple cam mechanism.
It is possible to smoothly transport the cut sheet 3a after it has been fed out, and the feed roller R21 and presser roller R4 are no longer necessary, making it possible to reduce the weight of the device and improve costs.In addition, the cut sheet 3a is prevented from being skewed and wrinkled. can eliminate the cause of
Furthermore, it becomes easier to discharge the cut sheets 3a when they are jammed.

In the above example, the case where the pressing plates 43a, 43b are retracted/returned using a cam mechanism has been described, but other methods may also be used.
A similar effect can be obtained by retracting/returning b using a lever mechanism or the like linked to a plunger magnet.

Further, although the case of feeding cut sheets of a wire tod printer has been described, the present invention can be generally applied to a medium feeding device for cut sheets.

〔Effect of the invention〕

As explained above, according to the present invention, the pressing force of the pressing plate can be reduced after the paper sheets are fed out, so that the transfer of the zero paper sheets becomes smooth.

■Feed roller between payout roller and platen.

This eliminates the need for a presser roller, making it possible to reduce the weight of the device and improve costs.

Not only can the causes of skewed feeding and wrinkles of paper sheets be eliminated, but also the ejection process when paper sheets are jammed is facilitated.

There is an effect.

[Brief explanation of drawings]

Fig. 1 is a principle block diagram of the present invention, Fig. 2 is a side view showing an embodiment of the invention, Fig. 3 is an explanatory diagram of Fig. 2, Fig. 4 is a timing chart of Fig. 2, Fig. 5 6 is a plan view showing an outline of a wire tod printer, and FIG. 6 is a side view showing a conventional method. In the figure, 2 is a transfer roller, 2a is a platen, 3 is a paper sheet, 3a is a cut sheet, 4 is a paper feed unit,
13 to 16 are paper guides, 18 is a rotating shaft,
19 is a shaft, 20 is an evacuation means, 20a, 2
0b is a cam, 42 is an elastic member, 42a, 42
b is a spring, 43 is a pressing member, 43a,
43b is a pressure plate, R2 is a feed roller, R21 is a feed roller, Rli, R3bl, Ra is a press roller, R6m, and 86b are delivery rollers. 42 ryo (ku) or7t-i missing crawl scale 4b) -11P44Aノ8A4iQ'l'-'J Takarazuichi! r 夛p Quimin 7゛4-yard 澾→・e

Claims (1)

[Claims] (1) Feeding roller whose rotation is controlled in conjunction with the same direction (
R), a transfer roller (2), and a pressing member (43) rotatably attached to the bottom of the paper feed section and misaligned in the direction of the feed roller (R) by an elastic member (42). The paper sheets (3) set in the paper feed section are pressed against the feeding roller (R) by the pressing member (43), and the paper sheets (3) are rotated by the feeding roller (R). A medium feeding device that feeds out paper sheets (3) one by one and transports the fed out paper sheets (3) by a transfer roller (2), A medium feeding device comprising a retracting means (20) for retracting the pressing member (43) in a direction to reduce the pressing force at a timing when the feeding force of the transfer roller (2) becomes effective.