JPS648948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording paper transport device suitable for use in facsimile machines and the like.

Conventionally, in this type of device, a roll of recording paper is set in a housing, and after the recording paper passes through a recording head section, it is fed out by being held between paper feed rollers on the ejection side. It's summery. Therefore, each part must be released when performing maintenance, removing recording paper in the event of a jam, or replenishing new recording paper. However, conventional devices have the disadvantage that the release operation is extremely difficult and troublesome.

The present invention has been devised in view of the above points, and it is possible to easily release each part of the recording paper conveyance path, and also to prevent the roll paper storage box from being pulled out while the recording paper is set. The object is to obtain a recording paper conveyance device.

The present invention provides a reset lever that is positioned at a lock position that interferes with the roll paper storage box and prevents its withdrawal, and an open position that does not interfere with the roll paper storage box.
This reset lever is designed to simultaneously release the remaining amount of recording paper detection plate, release the recording head from the platen roller, and release the recording paper from the paper feed roller, thereby releasing each part in the recording paper conveyance path. and opening of the roll paper storage box can be performed only by operating the reset lever, thereby making it extremely easy to release the device.

An embodiment of the present invention will be described based on the drawings. The present embodiment relates to a facsimile machine, and the inside of a housing 1 is divided by a housing stay 2 which also serves as a scanner base, with a transmitting section 3 provided above and a receiving section 4 provided below.

Therefore, the upper surface of the housing 1 has a document table 5.
The document table 5 is provided with a document guide 6. A separating section 8 consisting of a pressure plate, a paper stopper, a separating pressure adjustment pin, a separating rubber, etc. is provided on the upper part of the separating roller 7.
A contact glass 11 is provided immediately in front of the contact glass 11. A light source 12 for document illumination and an inclined mirror 13 are provided below the contact glass 11, and a lens 14 is provided on the right end side facing the mirror.
and a solid-state imaging scanning element 15.

Next, in the center of the receiving section 4, a roll paper storage section 16 is provided. This roll paper storage section 16 has a roll paper storage box 19 that is provided so as to be movable back and forth by a slide rail 17 and an auxiliary rail 18. Circular flange portion 2 of roll paper holder 21 that holds paper 20
Two holder placement stays 23 for receiving 2 are provided. In addition, the roll paper storage box 1
9 has an upper opening notch 25 that allows the roll paper knob 24 of the roll paper holder 21 to protrude forward.
is formed, and in the upper corner in the feeding direction,
A feed roller 26 and a hand cutter 27 are provided.

A guide 28 is bent into an L-shape to face the hand cutter 27, and below the guide 28, a platen roller 29 which also serves as a conveyance roller and a thermal head 30 which serves as a recording head are connected to each other. It is set in. A cutter 32 is attached to a guide plate 31 that is expanded toward the thermal head 30 side. That is, this cutter 32 has a fixed blade 33.
and a rotating movable blade 34. A paper feed roller 35 consisting of a pair of rollers is provided on the discharge side of the cutter 32.

Next, based on Figures 2 to 8, record paper 2
The path of 0 and its movement will be explained. First, the guide 28 facing the hand cutter 27 consists of an upper guide plate 36 and a lower guide plate 37. This guide 28 is bent along the curl direction of the recording paper 20, and the lower guide plate 37 The upper guide plate 36 is formed short so that an opening 39 is formed between the upper guide plate 36 and the introduction portion 38 between the platen roller 29 and the thermal head 30. There is.

What is shown in FIG. 3 is a part of the apparatus shown in FIG. 1 seen from the rear side, and FIG. 4 is a plan view thereof. First, the drive pulley 42 and platen pulley 43 of the motor 41, which is a stepping motor attached to the back plate 40, are connected to the transmission belt 4.
Connected by 4. This platen pulley 4
3 is integrally connected to the platen roller 29, and a delivery pulley 46 around which a delivery transmission belt 45 is wound is also integrally connected to the platen roller 29. This platen roller 2
9 is provided with a platen gear 47 via a one-way clutch so that power is transmitted only when the platen roller 29 rotates clockwise, and a switch plate 48 and a cutter cam 49 are integrated. A cutter gear 50 is provided on the platen roller 29 with a one-way clutch interposed therebetween. Idler gears 51 and 52 are provided that mesh with the platen gear 47 and the cutter gear 50, respectively, and the platen roller 29
The cutter gear 50 is meshed so that the rotational speed of the cutter gear 50 is increased relative to the rotational speed of the cutter gear 50 . The switch plate 48 also has one recess 5 on its circumference.
3 is formed and the cutter position switch 54
The actuator is provided to engage and disengage.

Next, a cutter bracket 57 biased clockwise by a tension spring 56 is fixed to the support shaft 55.
A cutter cam follower 58 is attached to the cutter bracket 57 and is in contact with the cutter cam 49 whose outer periphery is formed in a spiral shape. The movable blade 34 is fixed to the support shaft 55. Further, the protruding piece 5 of the cutter bracket 57
A cutter stopper 60 is provided, with which the cutter stopper 9 abuts and its maximum rotation angle is set.

Next, what is shown in FIG. 5 is the drive system for the paper feed roller 35, and its direction is seen from the rear side as in FIG. 3. First, the feed transmission belt 45 is wound around the body of a gear 61, which is attached to the shaft 62 of the paper feed roller 35 with a one-way clutch 63 interposed therebetween. That is, when the gear 61 rotates clockwise, power is not transmitted to the shaft portion 62, and when the gear 61 rotates counterclockwise, the power is not transmitted to the shaft portion 62.
Power is transmitted to. The gear 61 is meshed with an idler gear 64, another idler gear 65 is meshed with this idler gear 64, and this idler gear 65 is connected to a one-way clutch 66.
It is meshed with a gear 67 attached to the shaft portion 62 via. This gear 67 does not transmit power to the shaft portion 62 when rotating clockwise,
It transmits power when rotating counterclockwise.

Therefore, the feeding state of the recording paper 20 is such that printing is performed while the recording paper 20 is being fed by the rotation of the platen roller 29, and after being cut by the cutter 32, a margin portion corresponding to the distance between the cutting position and the printing section is cut. In order to reduce the amount, the recording paper 20 is returned by a predetermined size, and at the same time, the recording paper 20 beyond the cutter 32 is ejected by the paper feed roller 35.

This state will be described with reference to FIGS. 3 to 8, but since the orientation is opposite to that shown in FIG. 2, the rotation direction will be explained in the opposite direction. First, when the platen pulley 43 is rotated counterclockwise by the motor 41, the platen gear 47 does not rotate, and the platen roller 29 rotates counterclockwise to feed the recording paper 20 in the forward direction. At the same time, the gear 61 rotates counterclockwise via the feed transmission belt 45, thereby causing the paper feed roller 35 to rotate counterclockwise to feed the paper. This state is the state shown in FIG. 7, in which the gear 6 is
7 rotates clockwise, but the one-way clutch 66
As a result, it is idly rotating between the shaft part 62 and the shaft part 62.

Then, when the motor 41 reverses, the platen roller 29 reverses and spreads the recording paper 20, and at the same time the cutter cam follower 58 moves the cutter cam 4.
9, and the cutter bracket 57 is rotated until the protrusion 59 comes into contact with the stopper 60 due to the tension of the tension spring 56. As a result, the movable blade 34 cuts the recording paper 20.

Further, the reverse rotation of the motor 41 continues until the unrecorded portion at the leading end of the cut recording paper 20 reaches a predetermined length. At this time, the gear 61 is driven clockwise, but the one-way clutch 63 does not transmit driving force to the shaft portion 62, and the idler gears 64, 6
5, the gear 67 rotates counterclockwise, and thereby the paper feed roller 35 rotates counterclockwise. As a result, the cut and printed recording paper 20 is discharged.

However, if we look back at FIG. 2 to see how the recording paper 20 is returned, normally the platen roller 29
The feed roller 26 is reversed by the returning force of
The recording paper 20 is slackened in the roll paper storage section 16. However, when the rigidity of the recording paper 20 is low, when the load on the feed roller 26 is large, when the load on the guide 28 is large, the recording paper 20 deforms into a V-shape at the opening 39 as shown in the figure. Since the direction of this deformation coincides with the curling direction of the recording paper 20, the deformation easily occurs at the opening 39, thereby preventing it from causing a jam. Moreover, the deformation position of the platen roller 2 generates a feeding force on the recording paper 20.
Since it is close to 9, the movement during forward feeding again is good. Further, when the recording paper 20 is inserted, since the leading edge of the recording paper 20 is curled in the direction of contacting the lower guide plate 37, even if the opening 39 exists, the recording paper 20 is reliably guided to the introduction section 38.

Next, the movement of each component on the path of the recording paper 20 will be explained based on FIGS. 9 and 10.
First, a detection plate fulcrum shaft 69 is rotatably suspended between the back plate 40 and a front plate 68 that faces the back plate 40 at a predetermined distance. This detection plate fulcrum shaft 69 serves as the recording paper remaining amount detection plate release mechanism A, and is located at the upper right of the roll paper storage section 16, and is held in the middle part by the roll paper holder 21. A recording paper remaining amount detection plate 70 is fixed in contact with the outer peripheral surface of the recording paper 20, and a V-shaped reset lever 71 located in front of the front plate 68 is fixed to the front end. An operating knob 72 is attached to one end of the reset lever 71. Further, a cam 73 is fixed to the rear end of the detection plate fulcrum shaft 69, and a remaining amount detection switch 74 that is opened and closed by the cam 73 is provided.

Next, a press arm fulcrum shaft 7 is provided between the front plate 68 and the back plate 40 at the upper left side.
A head reset arm 76 constituting a recording head release mechanism B extending above the reset lever 71 is fixed to the front end of the press arm fulcrum shaft 75. A pair of press arms 77 are fixed to the front and rear of the press arm fulcrum shaft 75 with screws 78.
Pressing protrusions 79 extending rearward are integrally formed at the upper ends of these press arms 77, and the lower ends are biased clockwise by a tension spring 80. Further, a head hanger fulcrum shaft 81 is attached to the lower part of the press arm 77. A relay arm 82 is fixed to the press arm fulcrum shaft 75 with an adjustment screw 83 so that the angle can be adjusted freely. Further, a head hanger 84 is rotatably attached to the head hanger fulcrum shaft 81, and a tension spring 85 is attached between the head hanger 84 and the relay arm 82 to bias it counterclockwise. Such a head hanger 84 is formed with an engagement recess 86 that opens upward.

Next, a head bracket 87 for holding the thermal head 30 is provided, and head fulcrum shafts 88 and 89 are fixed to the front and rear ends of the head bracket 87 so as to be located on the same axis. The head fulcrum shaft 88 on the rear end side is fitted into the back plate 40, which serves as a bearing holding portion, so as to move in the axial direction thereof, and the head fulcrum shaft 89 is attached to the front plate 68, which serves as a bearing holding portion, by a nut 90. It is mounted so that it does not move in the axial direction, but rotates freely in the rotational direction. Arm hangers 91 are formed to protrude laterally from both sides below the head bracket 87, and these arm hangers 91 are engaged with the engagement recesses 86 of the head hanger 84. In this engaged state, the thermal head 30 is positioned so as to be joined to the platen roller 29 via the recording paper 20, but when the engagement with the engagement recess 86 is released, the thermal head 30 is set so that it separates from the platen roller 29 due to its own weight.

Next, an idler roll 92 is provided below the paper feed roller 35 so that its axis can be freely moved up and down and is constantly pressed against the paper feed roller 35 by a ring spring 93. A feed-out roller reset lever 94 whose lower end is joined to the shaft portion of the idler roll 92 is attached so as to be movable up and down. It is located at the bottom. The roller reset lever 94 and the head reset arm 76 constitute a recording paper nip release mechanism C.

Although the state shown in FIG. 9 is a normal set state, the reset lever 71 is positioned by the recording paper remaining amount detection plate 70 coming into contact with the recording paper 20. In this position, the roll paper storage box 19 cannot be pulled out, and the reset lever 71 functions as a safety guard. In this state, when the remaining amount of recording paper 20 reaches a predetermined state,
This means that the detection plate fulcrum shaft 69 has rotated significantly,
The cam 73 interferes with the remaining amount detection switch 74 to turn it on and generate a signal indicating that the recording paper 20 should be replenished.

In this way, when replenishing the recording paper 20, hold the operation knob 72 and release the reset lever 71.
Turn it clockwise. As a result, the reset lever 71 pushes up the head reset arm 76, and is positioned by the stop piece 95 bent at the end of the head reset arm 76 and comes to rest. This rotation of the reset lever 71 causes the remaining recording paper amount detection plate 70 to move away from the roll paper holder 21, and the reset lever 71 is retracted from the front of the roll paper holder 21, thereby allowing it to be pulled out. Also, as a result of the rotation of the head reset arm 76, the press arm fulcrum shaft 7
5, the press arm 77 is rotated counterclockwise. As a result, the head hanger fulcrum shaft 81
The head hanger 84 supported by the arm presses the arm hanger 91, and the head bracket 87 rotates counterclockwise. This allows thermal head 3
0 is moved away from the platen roller 29 to allow the recording paper to freely pass through this portion. Further, as a result of the press arm 77 rotating counterclockwise, the pressing protrusion 79 moves the feed roller reset lever 94
Press down. As a result, the idler roll 92
moves downward to widen the distance from the paper feed roller 35, allowing the recording paper 20 to pass freely.

In this way, by rotating the reset lever 71 counterclockwise, the roll paper holder 21 can be pulled out, and the recording paper remaining amount detection plate 7
0 reset, thermal head 30
releasing the contact between the platen roller 29 and the platen roller 29;
The four operations of releasing the recording paper 20 from the paper feed roller 35 are performed simultaneously. Therefore, the recording paper 20 left inside can be easily taken out, and the roll paper holder 21 can also be taken out and a new recording paper 20 can be set easily.

Also, when the reset lever 71 is returned to its original position,
Due to its own weight, the recording paper remaining amount detection plate 70 is joined to the outer peripheral surface of the recording paper 20, the thermal head 30 is also returned to its original position by the force of the tension spring 80, and the idler roll 92 is also returned to its original position by the force of the ring spring 93.

Therefore, it is necessary to remove the thermal head 30 for maintenance reasons. In this case, first push down the head hanger 84. As a result, this head hanger 84 is attached to the tension spring 8.
5 and releases the engagement with the arm hanger 91. As a result, the head bracket 87 hangs down about the head fulcrum shafts 88 and 89. In this state, when the nut 90 is removed and the head bracket 87 is moved toward the back plate 40, the head fulcrum shaft 89 on the near side will move toward the front plate 6.
It deviates from 8. Next, the head fulcrum shaft 89
By pulling the head bracket 87 toward the front to a position where it will not interfere with the front plate 68, the head fulcrum shaft 88 will come out of the rear plate 40, and the head bracket 87 will be removed with the thermal head 30 attached. is removed. As a result of removing the thermal head 30 in this way, the space in the center becomes larger, making maintenance of each part easier and allowing the thermal head 30 to be removed.
It is also easy to replace 0 itself.

Although the installation of the thermal head 30 is performed by performing the reverse operation, even after reassembly, if the position of the thermal head 30 with respect to the head bracket 87 is accurately determined, the position of the thermal head 30 after installation will be maintained. The position is always constant.

Next, the installation state and locked state of the roll paper storage box 19 will be explained based on FIGS. 11 to 15. First, the slide rails 18 provided on the sides have a normal shape that allows them to slide freely in the front-rear direction and can be pulled out toward the front. And the auxiliary rail 18 provided below
has a guide shaft 96 suspended between the front plate 68 and the rear plate 40. Two brackets 97 are slidably fitted to this guide shaft 96 at a predetermined interval, and these brackets 97 are connected to an intermediate guide 98.
is fixed to. This intermediate guide 98 has approximately the same length as the roll paper storage box 19 and has a channel-shaped cross section. Two protrusions 99 and 100 are bent at the intermediate portion and the front side. Next, a protruding piece 101 that approaches and separates from the outer side of the protruding piece 100 is bent in front of the side surface of the roll paper storage box 19. Furthermore, a locking lever 102 is provided at the back so as to be rotatable around a pin 103. A knob 104 is formed on this locking lever 102, and a tongue piece 105 facing the protruding piece 99 is integrally formed. The intermediate guide 98 is arranged so that the tongue piece 105 can rotate to release the engagement with the protruding piece 99 in a state where the tongue piece 105 is joined to the protruding piece 99.
An escape notch (not shown) is formed in the.

Next, the roll paper holder 21 is provided with a bearing body 107 which is urged outward by a compression spring 106.
This bearing body 107 is provided with a conical portion 10 of a gear body 108 rotatably attached to the back plate 40.
9 is pressed. Further, the gear body 108 is engaged with a gear portion 111 of a cam body 110 rotatably attached to the back plate 40. A protruding piece 114 that engages with two stopper pins 112 and 113 and an arc notch 115 having a predetermined arc length are formed on the outer periphery of the cam body 110. Then, the roll paper holder 2
A lock plate 116 that engages and disengages from the cam body 110 is fixed to the back end surface of the cam body 110.

The operation of attaching and detaching the roll paper storage box 19 will now be explained. For convenience of explanation, the removal operation will be explained first. First, in the installed state,
This is shown in FIGS. 12 and 15, and the roll paper holder 21 is held by grasping the roll paper knob 24.
Rotate clockwise. As a result, the recording paper 20 that had been extended toward the thermal head 30 is completely rewound. At the same time, the cam body 110 rotates counterclockwise due to the clockwise rotation of the gear body 108 and stops at the position where the projection 114 abuts the stopper pin 112. As a result, the circular notch 115 is attached to the lock plate 116 as shown in FIG.
matches the position of Therefore, the lock in the drawing direction of the roll paper storage box 19 is released, and when the roll paper knob 24 is grasped and pulled out, the roll paper storage box 19 is pulled out along the slide rail 17. The amount of withdrawal at this time is determined by the relative movement distance between the roll paper storage box 19 and the intermediate guide 98, that is, the distance A between the tongue piece 105 and the protruding piece 99, and the distance between the intermediate guide 98 and the guide shaft 96. relative movement distance,
That is, the front bracket 97 and the front plate 68
and the interval B. Therefore, the entire roll paper storage box 19 projects sufficiently forward from the front plate 68. In this state, when the knob 104 is pressed and the locking lever 102 is rotated upward, the engagement of the tongue piece 105 with the protruding pieces 99, 100 is released.
The roll paper storage box 19 can be completely pulled out to the front. Such withdrawal is in special cases, such as for maintenance. Therefore,
As a result, the roll paper storage section 16 becomes a space.
Operations such as removing the thermal head 30 described above are extremely easy.

In addition, as mentioned above, the roll paper storage box 19
If it is simply pulled out, it is for replenishing the recording paper 20, and the roll paper holder 21 is pulled up and taken out, and a new recording paper 20 is set. When the roll paper knob 24 is grasped and pushed in, the bearing body 107 is pressed against the conical portion 109 of the gear body 108. In this state, the roll paper holder 21 is rotated counterclockwise. As a result, the gear body 108 rotates counterclockwise and the cam body 110 rotates clockwise, resulting in the state shown in FIG. 15. As a result, the cam body 110 is brought to a position where it interferes with the lock plate 116, and the roll paper storage box 19 is prevented from coming off. and,
Hold the feed roller knob 117 and remove the recording paper 2.
0 is sent out, but a slip occurs between the bearing body 107 and the gear body 108, and the state shown in FIG. 15 is maintained.

Note that since the center of gravity of the cam body 110 is offset from its center, even if it is in a free state at the position shown in FIG. The lock plate 116 reliably passes through the arcuate notch 115.

As described above, the present invention provides a reset lever that is positioned at a lock position that interferes with the roll paper storage box and prevents its withdrawal, and an open position that does not interfere with the roll paper storage box, and a system that detects the remaining amount of recording paper connected to the reset lever. A plate release mechanism, a recording head release mechanism, and a recording paper nipping release mechanism are used to simultaneously release the remaining amount of recording paper detection plate, release the recording head relative to the platen roller, and release the recording paper from the paper feeding roller. Therefore, each part in the recording paper conveyance path can be released at the same time as opening the roll paper storage box, and this operation can be performed only by operating the reset bar. can be easily carried out.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional front view of a facsimile machine, FIG. 2 is an enlarged longitudinal sectional front view of a part of the recording paper path, and FIG. Figure 4 is a plan view of the drive system with the cutter, and Figure 5 is a rear view of the drive system of the paper feed roller, viewed from the rear.
FIG. 6 is a partially cutaway plan view, FIGS. 7 and 8 are explanatory diagrams showing the driving force transmission state of each part,
Fig. 9 is a front view showing the parts arrangement with the front panel omitted, Fig. 10 is its plan view, Fig. 11 is a front view of only the roll paper storage section, and Fig. 12 is a partially cutaway plan view. Figure 13 is a side view of the locking lever part, Figure 14 is a front view of the part facing the back end surface that the roll paper storage box comes into contact with, and Figure 15 is a side view of the locking lever part, and Figure 15 is a view of the locking lever when the roll paper storage box is locked in Figure 14. It is a front view of a state. 1... Housing, 19... Roll paper storage box, 20
...Recording paper, 29...Platen roller, 30...Thermal head (recording head), 35...Paper feed roller, 70...Remaining recording paper amount detection plate, 71...Reset lever, 77...Press arm, 92...Idle roller, 94... Roller reset lever, A... Recording paper remaining amount detection plate release mechanism, B... Recording head release mechanism, C
... Recording paper clamp release mechanism.

Claims (1)

[Claims] 1. A roll paper storage box that can be pulled out from the housing in a direction perpendicular to the conveyance direction of the recording paper;
A recording paper remaining amount detection plate that is attached to the recording paper held in the roll paper storage box to detect the remaining amount of the recording paper, and a recording head that faces the platen roller and is rotatably connected to the press arm. and a paper feed roller that pinches and discharges the recorded paper and is connected to a roller reset lever.
A reset lever is provided that is positioned at a lock position that interferes with the roll paper storage box and prevents its withdrawal, and an open position that does not interfere with the roll paper storage box, and the reset lever and the recording paper remaining amount detection plate are connected to a recording paper remaining amount detection plate. The reset lever and the press arm are connected by a release mechanism, the reset lever and the press arm are connected by a recording head release mechanism, the reset lever and an idle roller pressed against the paper feed roller are connected by a recording paper nip release mechanism, and the reset lever and the press arm are connected by a recording paper nipping release mechanism. The recording paper remaining amount detection plate is released, the recording head is released from the platen roller, and the recording paper is released from the paper feeding roller at the same time in conjunction with the movement of the lever to the open position. Recording paper conveyance device.