JPS6112366A - Paper feeder for printer - Google Patents

Abstract

PURPOSE:To make it possible to supply papers having different sizes with each other to a printer main body from a single paper feeder, by supplying paper to the printer main body from the paper feeder and, thereafter, releasing the connection of a paper feed means and a transmission means by a releasing means to bring the paper feed means to a free state. CONSTITUTION:A platen 11 is revolved by a drive motor in such a state that the paper P supplied from a paper feed table 24 is wound around the platen of a printer main body 2, and the printing to the paper P and the feeding thereof are performed. When the terminal end of the paper P is detected by an end sensor S, printing operation is stopped and the paper P is fed out to a paper receiving table 25. Next, when change-over operation for feeding paper is taken, the drive motor of the printer main body 2 is reversed and, when a main gear 27d is reversed, a cam plate 58 is reversed and the pin 51 of a change-over plate 46 is engaged with the engaging piece 58d of the cam plate 58. By rocking the change-over plate 46 against a tensile spring 50 by this engagement, a change-over lever 45 is rocked and an arm 32 is rocked around a pivot shaft 31 and the contact and engagement gear 33 provided to the leading end of the arm 32 is meshed with a main gear 27b. By the above-mentioned mechanism, change- over operation is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device for a printer that automatically supplies printing paper cut to an arbitrary length to a main body of a printer such as a personal computer.

[Conventional technology]

There are two types of paper feeding devices for this scale: those that have their driving source located on the paper feeding device side, and those that receive driving force from the printer's platen drive motor via gears, etc.; the latter are driven from the printer's main body. Paper feed device 1 that receives force has the advantage that the paper feed device U itself can be made smaller and lighter.This paper feed device is fed by a fixed amount of drive horn from the printer body. The paper roller rotated a certain amount, and the paper was sent one sheet fi to the platen of the printer main body.

[Problem that the invention seeks to solve]

The conventional paper feeding device described above requires a paper feeding device for Qj for each size of paper. Paper feed 1] - Due to the problem that the C paper is caught between the paper and the paper cannot be fed for printing, and if the paper is too short, the next paper is also fed. It was not possible to feed paper of different sizes with the paper feeder.

The present invention was conceived in view of the above, and an object of the present invention is to provide a printer paper feeding device that can feed sheets of different sizes to a printer main body.

[Means for Solving the Problems] The present invention provides a connection with a transmission means 3 that transmits forward and reverse driving force from the printer body 2 that covers the printing on the fed paper P, thereby driving the transmission means 3 in the forward rotation. A paper feeding means 4 is provided which supplies paper P to the printer main body 2 by force, and a switching means 5 is provided which connects this paper feeding means 4 to the transmission means 3 when the transmission means 3 is reversed. At the same time, a release means 6 is installed to disconnect the paper feed means 4 from the transmission means 3 when the transmission means 3 rotates in the normal direction.This is a paper feed device for a printer.

[Effect]

In the present invention, after paper is supplied to the printer body by a paper feeding means connected to a transmission means by a switching means, the connection between the paper feeding means and the transmission means is released by a release means, and the paper feeding means is set in a free state. Niunishi/;l: Something.

〔Example〕

Hereinafter, the configuration of an embodiment of the present invention will be described with reference to the drawings.

1 and 2, reference numeral 1 denotes a paper feeding device, and this paper feeding device 1 is connected to a transmission means 3 for transmitting driving force from the printer main body 2 by a predetermined connection. A paper feed means 4 for supplying paper P cut to size, such as A-4 size or B-5 size, to the printer main body 2; a switching means 5 for connecting the paper feed means 4 to the transmission means 3; Transmission means 3
and a release means 6 for releasing the connection of the paper feeding means 4 connected to the paper feed means 4.

The printer main body 2 has a platen gear 10 at one end (
The platen 11 is rotated by a pull drive motor (not shown), and the paper P fed to the paper guide 12 is held on the circumferential surface of the platen 11. The first pressure roller 13 is crimped onto this! 1
The platen 1 is placed at a substantially symmetrical position on the circumferential surface of the platen 11 by a guide part (not shown).
Terminal pressure to press paper P wound around 1 @ +-+-
La 14 is attached. Also, the paper feed device 1 is installed in the printer main body 2 near this platen 11.
A positioning shaft 15 is provided for positioning.

Note that a print head (second
An end switch (position indicated by arrow 1 in FIG. 2) for detecting the presence or absence of an MP (position indicated by arrow 1 in FIG. 2) is provided.

The paper feeding device 1 has a pair of side plates 20a and 20b, and an inverted U-shaped locking piece 21 that engages with the positioning shaft 15 is provided at the lower end of each side plate 20a and 20b. A locking lever 22 that is hooked to the lower part of the positioning shaft 15 when the locking piece 21 engages on the positioning shaft 1115 is provided at each of the holes. is biased in the locking direction by an expansion spring 23.Furthermore, between the side plates 20a and 20b, a paper feed table 24 on which a plurality of stacked sheets of paper P are placed faces the platen 11. In addition, in front of the paper feed tray 24, there is provided a paper discharge tray 25 on which the paper P discharged from the platen 11 after printing is loaded.

The transmission means 3 includes a pair of main gears 27a connected by a transmission shaft 26 to each outer surface of the side plates 20a and 20b.

27b is installed. One of the main gears 2.7a
is meshed with the platen gear 10 of the platen 11 via the driven tooth width 28, and a sub gear 29 having a smaller diameter than the main gear 27b is provided on one side of the other main gear 27b.

As particularly shown in FIGS. 3 and 4, the paper feeding means 4 is provided with a movable arm 32 which is swingably mounted on the outside of the side plate 20b and whose intermediate portion is supported by a support l11131.
At the tip of this arm 32, a separation gear 33 and a drive pulley 34 that can mesh with the main gear 27b are rotatably supported integrally, and one end is attached to the side plate 20-b at the rear end of the arm 32. An expansion spring 35 is attached which is pivotally supported by the expansion spring 35, and this expansion spring 35 urges the tip of the arm 32 to either the downward direction or the downward direction.

A small-diameter gear 36 and a driven pulley 37 are rotatably provided integrally near the bottom of this arm 32, and a timing bell 1-38 is stretched between the driven pulley 37 and the drive pulley 34, and , the support shaft 4 of a plurality of paper feed rollers 39 arranged on the paper feed tray 24 is disposed on the small diameter tooth width 36.
A paper feed gear 41 connected to the paper feed gear 41 is meshed with the paper feed gear 41 connected to the paper feed gear 41. The paper feed gear 41 and the support shaft 40 are connected by a one-way latch, so that the support shaft 40 is interlocked only when the gear 41 makes one positive rotation in the clockwise direction in FIG. .

- The switching means 5 is composed of a switching lever 45, a switching plate 46, and a switching plate driving section 47, and the switching lever 45 is formed in an abbreviated shape, and the middle part rotates around the side plate 20b. The arm 32 is movably supported and has one end connected to the arm 32.
The switching plate 4G is located at the tip of the long slot 4.
8 to the right, it is slidably provided on the side plate 20b with a support screw 49, and the rear Qvl of this switching plate 4G comes into contact with the other end of the first collar 45, and the front end is provided with a tension spring in one part. 50 is stretched, and a pin 51 is vertically protruded from the bottom.

As shown in FIG.
A cylindrical sleeve 54 of the crimp plate 53 is slidably fitted into one side plate 52a of the switch gear 52, and the other side 52b of the switching gear 52 is opened so that the coil spring 55 and the sleeve 54 of the crimp plate 53 can be inserted. An outer plate 57 having a sleeve 56 that is slidably inserted into the outer plate 57 is fitted, and the switching gear 52 is crimped to the crimping plate 53 by a coil spring 55 against the outer plate 57. and crimp plate 53
A friction effect is formed between the two. Further, a groove 53a is provided on the side surface of the crimp plate 53 opposite to the side surface on which the sleeve 54 is provided, and a pair of protrusions 53H (provided) are provided at opposing positions on the circumference of the edge of this groove 53a. Further, on the side surface of the crimp plate 53 where the groove 53a is provided, a cam plate 58 is provided with a pair of protrusions 58a that move within the groove 53a and engage with the protrusion 53b. are joined via a spring 59. Both ends of the spring 59 are attached to the plates 53 and 58, respectively, and the crimping plate 53 is pressed against the cam plate 5B in the normal rotation direction of the rη wheel 52. Fifth
In other words, when the crimp plate 53 rotates in the reverse direction of the switching gear 52 (clockwise direction in FIG. 5), the cam plate 58 follows due to the bias of the spring 59. Rotate in the reverse direction. Further, on the side surface opposite to the side surface on which the protrusion 58a of the cam plate 58 is provided, a groove 58b into which the pin 51 of the switching plate 46 is fitted is provided.
At a symmetrical position on the circumference of the edge of 8b is an engagement recess 58c in which the pin 51 is engaged only in the reverse direction of the switching gear 52 (counterclockwise direction in FIG. 5). Locking piece 58
[j has been established.

As shown in FIG. 6, the release means 6 includes the secondary gear 29
A release gear 61 that meshes with the release gear 61 is rotatably supported on the side plate 20b, and a disc 62 that engages and rotates only when the release gear 61 rotates forward is provided on one side of the release gear 61 on the side plate 201) side. The ratchet 1 is connected to the ratchet 1, and the side surface of the disc 62 has a semicircular notch 63 in which a protrusion 62a protruding from the disc 62 engages. Blank 63a
, 63b is provided with an IJ board 64 that can rotate about half a turn until it comes into contact with the protrusion 62a. Further, a spring 65 is interposed between the cam plate 64 and the disk 62, and when the disk 62 is pressed against the release gear 61,
In addition, the protrusion 62a of the disc 62 is urged against one notch surface 63a of the cam plate 64. Also, the side surface 20b of the cam plate 64
A protrusion 64a protrudes from the side of the notch 63 on one side.
This protrusion 64a can engage with a pin 68 provided at the tip of a release lever 67 rotatably supported on the support shaft 31 of the arm 32, and this release lever 67
The upper and lower portions abut against a locking rod 69 provided on the arm 32 and a fixing rod 70 provided on the side plate 20b.

Further, between the side plates 20a and 2Ob, as shown in FIG. 1 and FIG.
A plurality of pairs of l1 paper rollers 71a and 72b are stacked to transport the ejected paper P to the paper ejection table 25, and one of the pair of l1 paper rollers 71a and 72b is
A paper discharge gear 73 that meshes with one of the main gears 27a is provided at one end of the rotating shaft 72 of the paper roller 71a that protrudes from and covers the side plate 20a.

Then, with the paper P supplied from the paper feed tray 24 being wound around the platen 11 of the printer main body 2, the platen 11 is rotated by a drive motor (not shown), and printing and printing on the paper P are performed. Paper is fed.

Then, when the end of the paper P is detected by the endlencer S, the printing operation is stopped and the paper P is sent to the paper discharge tray 25.

Next, upon entering the switching operation for paper feeding, the drive motor of the printer main body 2 is reversed, and the main gear 27b is reversed via each gear 10.28° 27a and the transmission shaft 26. As the main tooth center 27b is reversed, the cam plate 58 is reversed via the switching gear 52, the pressing plate 53, and the spring 59, and the pin 51 of the switching plate 46 is engaged with the locking piece 58d of the cam plate 58. do. Due to this engagement, the following action of the spring 59 of the cam plate 58 with respect to the crimp plate 53 is cut off, and the force of the crimp plate 53 is applied approximately half a rotation, so that the protrusion 53b of the crimp plate 53 moves toward the protrusion 58 of the cam plate 58.
a and press it. This cam plate 5B is the crimp plate 5.
4 and the switching plate 46 swings against the tension spring 50, the switching lever 45 swings, and the arm 32 swings around the support shaft 31. 33 meshes with the main gear 27b. The switching operation is completed as described above, but even if the main gear 27b and the switching gear 52 continue to reverse rotation, a slip occurs between the switching gear 52 and the pressure bonding plate 53 due to the friction action, and rotation is not transmitted. On the other hand, the paper feed gear 41 is reversed by the engagement gear 33 meshing with the main gear 27b, but since the paper feed gear 41 and the support lN140 are connected with a one-sided clutch, the paper feed roller 39 of the support shaft 40 Rotation is not transmitted, and rotation is not transmitted between the release gear 61 meshing with the secondary gear 29 and the disc 62 due to the loveet mechanism.

Next, the drive motor of the printer main body 2 is rotated forward and the main gear 2
7b rotates normally. Along with this, the rotation is transmitted to the paper feed gear 41 via the approach/separation gear 33, the paper feed gear 39 rotates normally, and the paper P is sent to the platen 11 in the printer main body 2. Further, the cam plate 58 rotates forward via the switching gear 52,
When the pin 51 of the switching plate 46 is disengaged, the pin 5
1 moves freely within the % 58b of the board 58. Therefore, the switching plate 46 is pulled back by the tension spring 50, but since the arm 32 is biased by the spring 35, the approaching/separating gear 33 does not separate from the main gear 211).

Further, as the auxiliary gear 29 rotates forward, the cam plate 64 rotates forward via the release gear 61, and when the protrusion 64a of the cam plate 64 comes into contact with the pin 68 of the release lever 67, the arm 32 is loaded and the cam Plate 64 is prevented from rotating. Then, the protrusion 62a of the disc 62 that was in contact with one notch surface 63a of the cam plate 64 is pushed against the other notch surface 63b against the spring 65, causing the cam plate 64 to rotate. Due to this rotation of the cam plate 64, the protrusion 64a of the cam plate 64 pushes up the pin 70 of the release lever 67, and together with the release lever 67, the arm 32
oscillate. Therefore, the approaching/separating gear 33 and the main gear 271)
The sheet feeding operation is completed when the meshing with the sheet P is released, and at this point, the leading edge of the sheet P is held between the platen 11 and the starting end pressure roller 13. At this time, the contact gear 33 becomes free and the paper feed roller 39 becomes rotatable, so the paper feed roller 39 holds the rear end of the paper P and pulls the paper P into the printer main body 2. be able to.

Note that even if the main gear 27b and the switching gear 52 start to reverse, there is still play between the pressure bonding plate 53 and the cam plate 58, that is,
Since a dead zone is provided, even if the drive motor is reversely rotated to the extent that the platen 11 returns a little during printing, the switching plate 46 will not be slid by the cam plate 58, and the switching operation will start immediately. Never.

The control by the control means 8o installed in the printer main body 2 is shown in the flowchart of FIG. When the connection relationship with the host computer (online (→local)) is selected by the redirect switch, the drive motor is reversed by a certain amount when the end switch S is in the on state to perform the switching operation. When the paper P is sent to the platen 11 and the end switch S is switched to the off contact, the platen 11 is rotated in the normal direction until the paper P is located at the proper printing position, and then the paper feed operation is started. Printing is performed line by line on the paper P until the switch S is switched to the ON contact point.Also, when the printing on the paper P is completed, the paper P is ejected and the bolt combination coater determines the feeding command for the next paper P. Note that even if the drive motor normally rotates forward during paper feeding, if the end switch S does not switch to the A-F contact, in other words, if there is a jam or a paper shortage, the drive motor should be stopped. In addition, since it is necessary to drive each means 3, 4, 5, and 6 during paper feeding operation compared to normal printing operation, the load on the drive motor increases, so the pulse cycle of the drive motor is reduced. 1. Effects of the Invention According to the present invention, paper is supplied to the printer main body by the paper feeding device connected to the transmission means by the switching means. after,
The release means releases the connection with the paper feeding means and other transmission means, leaving the paper feeding means in a free state, so paper can be drawn into the printer main body without being obstructed by the paper feeding device. It is possible to supply paper of a certain size to the main body of the printer.

[Brief explanation of drawings]

The figures show an embodiment of the apparatus of the present invention, in which Fig. 1 is a perspective view of the paper feeding device, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is a side view of the main parts, and Fig. 4 is an operational state. 5 is an exploded perspective view of the switching means, FIG. 6 is an exploded perspective view of the 1° release means, and FIG. 7 is a flowchart showing the control of the printer body. 1. Feeding Paper packaging ■, 2. Printer body, 3. Transmission means, 4. Paper feeding means, 5. Switching means, 6. Release means,
80...Control means, P...Paper.

Claims (3)

[Claims] (1) A transmission means that transmits forward and reverse driving force from the printer body that prints on the fed paper, and a paper feed that supplies the paper to the printer body by connecting with this transmission means when the transmission means rotates in the normal direction. switching means for connecting the paper feeding means to the transmission means when the transmission means rotates in the reverse direction; and release means for disconnecting the paper feeding means from the transmission means when the transmission means rotates in the normal direction. A paper feed device for a printer, characterized by comprising: (2) The paper feeding device for a printer according to claim 1, wherein the switching means is provided with a dead zone for the reverse driving force from the transmission means. (3) The paper feed device for a printer according to claim 1, characterized in that the printer main body is provided with a control means for controlling the drive motor to rotate in reverse and in the forward direction by reducing the pulse cycle during paper feeding compared to during printing. .