JPH01320176A - Recording paper fixing device in printer - Google Patents

Abstract

PURPOSE:To simplify structure and to prevent malfunction by a method wherein a drum is rotated forward in recording, and the drum is rotated reverse by a predetermined amount only at a paper feed position or paper discharge position, thereby releasing a pressing-up member to load/unload recording paper. CONSTITUTION:An end part of recording paper 3 is inserted between a drum 1 and a recording paper fixing member 4, the drum 1 is rotated forward in a direction of an arrow (a), guide pins 6, 8, 10 are moved along guide grooves 7, 9 and a guide wall 11 by the pressing force of a torsion spring 16 to shift a pressing-up member 14 upwards, the recording paper fixing member 4 is pressed up against the cylindrical surface of the drum 1 to fix the recording paper 3, a paper feed action is performed by the forward rotation of the drum 1, and a recording is applied to the recording paper 3 by ink paper 16. After the recording, a head arm 19 is rotated so as to prevent the contact of a thermal head 18 with the recording paper fixing member 4, and the drum 1 is rotated in a direction of an arrow (b); a rotating pin 12 is engaged with a paper discharge arm 28, the recording paper fixing member 4 is separated from the cylindrical surface of the drum 1, and the pressing-up member 14 is rotated in the direction of the arrow (a) relatively to the drum 1, whereby the trailing edge of the recording paper 3 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording paper fixing device for a printer that records on recording paper wound around the cylindrical surface of a drum.

[Conventional technology]

In the prior art, as disclosed in Japanese Patent Application Laid-open No. 128772/1982, a stepped portion running parallel to the axis of the drum is provided on the cylindrical surface, and a recording paper fixing member is provided to press and hold the recording paper against the stepped portion. ing. In this conventional technology, the drum is rotated in reverse to push up the recording paper fixing member, the leading edge of the recording paper fed from the paper feed port is inserted between the drum and the recording paper fixing member, and then the drum is rotated in the normal direction to remove the recording paper. The tip of the drum is clamped and fixed between the drum and the recording paper fixing member, and recording is performed while rotating in the normal direction. After recording, the drum is reversed and the recording paper fixing member is pushed up by the same operation as when feeding paper. The configuration was such that the recording paper was ejected from the rear end.

[Problem to be solved by the invention]

In the conventional technology described above, the feeding position of the recording paper to the recording device is the same for both paper feeding and paper ejection, so when recording continuously, it is necessary to feed the next recording paper after paper ejection is finished. As a countermeasure to this problem, there is a mechanism in which a paper feed port and a paper ejection port are provided separately, and the recording paper conveyance path is switched each time paper is fed and ejected, but this method uses a solenoid, etc. The structure is complicated, and there is also the problem that the processing cost increases because additional rubber is added to the outer periphery of the drum at the step part created by processing the cylindrical surface of the drum so that the recording paper fixing member does not protrude from the outer periphery of the drum. there were.

The configuration in which a recording sheet whose leading edge is fixed only is ejected from the rear free end has various problems, such as the possibility that the recording sheet may break during conveyance and the use of thin sheets of paper. The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a recording paper fixing device for a printer that is simple in structure, reliable in operation, and easy to use.

[Means to solve the problem]

The above purpose is to provide a recording paper fixing member that connects the push-up members at both ends of the drum and is provided parallel to the axis along the cylindrical surface of the drum, and is arranged in a direction opposite to the rotational direction of the drum during recording and paper feeding/ejection. This is achieved by providing recording paper attachment/detachment means configured to open and close the recording paper fixing member by applying a predetermined amount of rotation to the recording paper fixing member.

[Effect]

With the above configuration, the drum can be rotated forward during recording, and rotated backwards by a predetermined amount only at the paper feeding position and the paper ejection position to open the push-up member and attach/detach the recording paper;
During conveyance for feeding and discharging paper, the structure rotates in the normal direction in the same way as during recording, so the structure is simple and malfunctions do not occur.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory layout diagram showing an outline of the structure of a recording paper fixing device of a printer according to the present invention, and FIG. 2 is a perspective view of the main part of FIG. 1. The recording paper 3 is guided by a guide plate 21 and conveyed in the direction of arrow P by a paper feed roller 22, between the drum 1, which is covered with an elastic material such as rubber and rotates integrally with the drum shaft 2, and the recording paper fixing member 4. The tip end is fixed to and rotates in the direction of arrow a (hereinafter referred to as normal rotation direction). Recording is performed when the ink paper 16 fed out from the ink cassette 17 passes through the contact area with the drum 1. Next, the recording paper 3 advances along the direction of arrow Q, is sent to the paper discharge roller 27, is guided to the paper discharge guide plate 30, and is discharged. A thermal head 18 melts the ink applied to the ink paper, and is fixed to the end of a head arm 19 that rotates around an arm shaft 29. In response to a recording command, the ink paper 16 is pressed against the recording paper 3 as shown in the figure. let

Next, the main components of the present invention will be explained.

A pair of push-up members 14 are provided on both end faces of the drum 1 and are fitted and supported by the drum shaft 2, and a recording paper fixing member 4 is provided integrally with the push-up members 14 and parallel to the axis of the drum.

The fitting hole is an elongated hole extending in the diameter A-A direction passing through the center of the recording paper fixing member 14 and the drum shaft 2, and is a guide that engages with a guide pin 6.8 installed on the end surface of the drum 1. grooves 7, 9
It is equipped with In addition, the guide pin 10 provided separately is connected to the guide wall 1.
1. A pair of rotating members 13 are fitted onto the drum shaft 2 on the outside in contact with the pushing up member 14 , the - end is connected to the pushing up member 14 by a hinge 15 , and the opposite end of the rotating member 13 from the hinge 15 with respect to the drum shaft 2 is fitted with a rotating member 13 . A pin 12 is fixed. A torsion spring 16 is fitted onto the drum shaft 2 and fixed by urging the recording paper fixing member 4 in a direction to bring it into close contact with the cylindrical surface of the drum 1. The paper feeding arm 25 and the paper discharging arm 28 are rotatably fixed to the machine frame with respective biasing springs biased, and are arranged so as to be able to engage with the rotation pin 12 as the drum 1 rotates. There is.

The paper feeding operation of the present invention in the above configuration will be explained with reference to FIG. When the recording paper 3 is inserted into the paper feed roller, a sensor 24 using a photodetecting element provided at the bottom of the paper feed guide plate 12 detects a signal from the paper feed arm 25 when the drum 1 rotates in the direction indicated by the arrow (first reverse rotation). The pivot pin 12 engages, and the push-up member 14 receives a force that moves downward in the figure while pivoting in the direction of the arrow with the hinge 15 as a fulcrum, and the guide pin 6 is moved in the diametrical direction of the guide wall 7 and the guide pin 8 slides in the diametrical direction of the guide wall 9, and the guide pin 1o slides along the guide wall 11, and the recording paper fixing member 4 is separated from the cylindrical surface of the drum 1. At this time, the paper feed position sensor 24 detects the movement of the recording paper fixing member 4,
The rotation of the drum 1 is stopped by a control section (not shown).

Since the above operation is performed at a predetermined position depending on the position of the paper feed arm 25, it is effective even though the rotation of the drum 1 is stopped.

Next, the end of the recording paper 3 is inserted between the drum 1 and the recording paper fixing member 4, and when the drum 1 is rotated forward in the direction of arrow a by the same amount as the first reverse rotation, the guide pin is pushed by the biasing force of the torsion spring 16. 6.8.10 moves the push-up member 14 upward in the figure along the guide groove 7°9 and the guide wall 11, presses the recording paper fixing member 4 against the cylindrical surface of the drum 1, fixes the recording paper 3, and further Paper feeding operation is performed by forward rotation of the drum 1. At this time, the recording paper 3 is inserted into the guide plate 21 and fed by the paper feed roller 22 until it is detected by the paper feed position sensor 24 and the recording paper 3 reaches between the recording paper fixing member 4 and the drum 1. After that, the drum 1 is rotated in the forward direction by a control section (not shown), thereby ensuring paper feeding.

Next, the paper ejecting operation will be explained with reference to FIGS. 4 and 5.

FIG. 4 is a side view when the recording paper fixing member 4 starts to separate from the drum 1, and the drum 1 has rotated approximately half a rotation from the state shown in FIG. After this is completed, the head arm 19 is rotated so that the thermal head 18 does not come into contact with the recording paper fixing member 4,
The drum 1 stops at the position where the rotation pin 12 engages with the paper ejection arm 28, but the above-mentioned stopping position of the drum 1 is determined by the paper feed position sensor 28.
This is done by detecting and controlling a drum driving device (not shown) by the control section based on the detected position by the controller. The drum 1 may be provided with a drum rotation position detection means for control. When the rotation pin 12 rotates in the direction indicated by the arrow from the state shown in FIG. 4, the rotation pin 12 engages with the paper discharge arm 28, as shown in FIG. 4 is removed from the cylindrical surface of drum 1. When the rotation in the same direction is continued, the guide pin 6.8 slides along the circumferential direction of the guide grooves 7 and 9, and the guide pin 10 slides along the guide groove 11. The amount of rotation of the drum 1 is set to be slightly larger than the first amount of reversal shown in FIG. 3 (second reversal).

As a result, the push-up member 14 rotates in the direction of arrow a with respect to the drum 1, and as a result, the end of the recording paper 3 that was fixed by the drum 1 and the recording paper fixing member 4 is released, and the recording paper 3 is moved to the auxiliary roller 31. The other end of the recording paper 3 is restrained, and due to the rigidity of the recording paper 3 itself, it separates from the cylindrical surface of the drum 1 and floats up.

Next, when the drum 1 is rotated forward, the recording paper 3 is transferred to the auxiliary roller 3.
1 and the rotation of the drum 1, the paper is conveyed by the rotation of the paper discharge guide plate 3o.
The paper reaches the paper ejection roller 27 through the. The recording paper 3 is detected by the paper ejection sensor 26, and the paper ejection roller 2 is detected by the control section (not shown).
7 and is discharged to the outside.

On the other hand, while the rotation pin 12 rotates in the direction of arrow a by the same amount as the amount of the second reversal, the torsion spring 16 causes the discharge arm to
8, the recording paper fixing member 4 is again pressed against the surface of the drum 1 as the drum 1 rotates. As mentioned above, the present invention
Since the paper feed port for feeding the recording paper 3 into the recording device and the paper discharge port for discharging the recording paper 3 from the recording device can be provided separately, when recording is performed continuously, the previously recorded record The next recording paper 3 can be set in the paper feed slot before the paper 3 is ejected, and since the paper is fed with the recording surface facing down and is ejected with the recording surface facing upward, it prevents the recording surface from becoming dirty. It is easy to use in that the user can check the recorded image during the paper ejecting operation. Furthermore, when the drum 1 rotates in the normal direction, the rotation pin 12 rotates without being restrained by the paper feed arm 25 and the paper ejection arm 28, and normal recording operation is performed. Because it is performed by reverse rotation,
No special means for opening and closing the recording paper fixing member 4 is required, and there is no malfunction.

6 and 7 are explanatory diagrams showing other embodiments of the present invention.

FIG. 6 shows a recording paper fixing member 4' having a U-shaped cross section. When the recording paper fixing member 4' is pressed onto the drum 1', it is provided along the longitudinal direction of the drum 1' The lower part of the U-shaped cross section is buried in the groove 1'a, and the holding part 4'a
and the claw 4'b, the holding part 4' holds the recording paper 3 in the gap between 1 and 2Iff11 and forms a U-shape if necessary.
The inner surface of a is lined with a material such as rubber to securely fix the recording paper 3, and the claw 4'b is attached to the drum 1 when the paper is ejected.
'It is configured to protrude outward from the cylindrical surface by 0.5 to 1 mm. Therefore, when performing the paper ejecting operation shown in FIGS. 4 and 5, when the recording paper fixing member 4' moves in the diametrical direction of the drum 1', the claw 4'b pushes up the recording paper 3 from the bottom side and securely secures it. This is suitable for peeling the leading edge of the recording paper 3 from the cylindrical surface of the drum 1'. Further, even when the recording paper 3 and the cylindrical surface of the drum 1' are stuck together due to static electricity or the like, reliable paper ejection is possible.

FIG. 7 is an explanatory diagram of an embodiment in which a paper binding/discharging port 33 is provided.
Insert the recording paper 3 from the direction of the arrow C in the figure into the paper loading/discharging port 33, fix the leading end with the drum 1 and the recording paper fixing member 4, and rotate the drum 1 in the direction of the arrow A, as shown in FIG. After recording with the means, the recording paper fixing member 4 is reversed in the direction of the arrow.
After removing the recording paper 3 from the drum 1, the leading edge of the recording paper 3 is released, and the drum 1 is rotated again in the direction of the arrow a to convey the recording paper 3 and discharge it in the direction of the arrow d. In this embodiment, by providing a paper output/discharge port 33 that consolidates paper supply/discharge in one place, the number of component parts can be reduced and the size can be made smaller.

〔Effect of the invention〕

By implementing the present invention, paper feeding and ejection operations are performed only by forward rotation of the drum in the direction of arrow a, similar to recording, and continuous paper feeding is achieved by arranging the paper feed port and paper ejection port separately. During paper ejection, the leading edge of the recording paper is pulled out by the paper ejection roller, which prevents paper ejection errors due to jams, and the opening/closing operation of the recording paper fixing member required for feeding and ejecting paper is performed by rotating the drum in the opposite direction of the arrow. Since this is carried out manually, it is possible to provide a recording paper fixing device for a printer that has a simple structure, is free from accidents such as errors in attaching and detaching the recording paper due to malfunction, and is highly reliable.

[Brief explanation of the drawing]

FIG. 1 is an explanatory layout diagram showing an outline of the structure of the recording paper fixing device of a printer according to the present invention, FIG. 2 is a perspective view of the main part of FIG. 1, and FIG. 3 is an explanation of the paper feeding operation of FIG. 2. 4 is an explanatory diagram immediately before the recording paper fixing member is released from the state of close contact with the drum, FIG. 5 is an explanatory diagram when the recording paper fixing member is detached from the drum, and FIGS. 6 and 7 are illustrations of the present invention. It is an explanatory view of another example. 1.1'...Drums 4, 4'...Recording paper fixing member,
6.8.10... Guide pin, 7.9... Guide groove, 11... Guide wall, 12...
・Rotating bottle, 14...Pushing member, 1'a・
...Groove portion, 4'a...pressing portion. 4'b...Claw, 21...Paper feed guide plate,
No. 1 Kukuzu 2 Fig. 3 Fig. 4 Fig. Broom 5 Fig. 6 Fig. 4' 111 ri ζe county 4'b-111 夙 7th side 33---# for the end of slander

Claims (1)

[Scope of Claims] 1. Recording, paper feeding, and paper ejection are performed by rotation of a cylindrical drum, which is integrally coupled with a pair of push-up members provided on both end surfaces of the drum, and which moves along the cylindrical surface of the drum. In a recording paper fixing device for a planter having a recording paper fixing member parallel to a drum axis, the recording paper is fixed by applying a predetermined amount of rotation in a direction opposite to the rotational direction of the drum during recording and paper feeding/ejection. A recording paper fixing device for a printer, comprising a recording paper attaching/detaching means configured to open and close a member. 2. The attachment/detachment means includes a guide pin implanted in the end surface of the drum, a guide groove provided in the push-up member that engages with the guide pin, and a guide groove that extends in the diametrical and circumferential directions of the drum. 2. The recording paper fixing device for a printer according to claim 1, wherein the recording paper fixing device for a printer has a free movement dimension that allows rotation of the predetermined amount. 3. The recording paper fixing member has a U-shaped cross section, and includes a longitudinal groove in which approximately half of the U-shaped cross section is buried in the cylindrical surface of the drum.
Recording paper fixing device for the printer described in Section 1. 4. The recording paper fixing device for a printer according to claim 1, further comprising a paper loading/discharging port in which the paper feeding and paper discharging parts are concentrated in one location.