JP2589712B2 - Long sheet transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention uses, for example, roll paper, that is, a recording paper wound in a roll shape, and records a multicolor polymerization color image on the same surface of the recording paper. The present invention relates to a long sheet transfer device which is extremely useful when applied to such a color image recording device.

[Prior art] As an example of this type of color image recording apparatus, it was announced at the 5th Non-Impact Printing Technology Symposium, Vol. 101, sponsored by the Institute of Electrophotography, and commercialized as Model EC-42 of Versatech, USA. There is an electrostatic color plotter. Such an apparatus is generally configured as follows. The roll-shaped recording paper held by the roll paper holding mechanism is transported in a certain direction by a transport mechanism including a driving roller and a pressure roller. A required electrostatic latent image is formed on the recording paper being transported by an electrostatic recording head, and the latent image is selectively actuated by one of a plurality of developing heads using developers of different colors. Develop to obtain a first color image. Then, after returning the recording paper to the original position, a color image of the second color is obtained through the same process as the first color. In this way, a color image is superimposed and formed on the same sheet while the roll-shaped recording paper is reciprocated a plurality of times.

The recording paper transport mechanism in the above-described color image recording apparatus generally includes a driving roller that is rotated by a driving source, a pressure roller mechanism that constantly presses the recording paper against the surface of the driving roller, and a pressure roller mechanism. Is released from the surface of the drive roller when the recording paper is loaded or the like.

The pressing roller mechanism is configured such that each base end of about five pressing roller assemblies is axially mounted on a support shaft arranged in parallel with the driving roller, and each of the pressing roller assemblies is displaced in one direction by a spring. The pressure roller, which is rotatably attached to the tip of the pressure roller assembly, is configured to be pressed against the surface of the drive roller.

The release mechanism is operated by rotating the release operation lever.
By rotating the pressing roller assembly in the opposite direction against the elastic force of the spring, the pressing roller can be separated from the surface of the driving roller in a timely manner.

[Problems to be Solved by the Invention] The conventional recording paper transport mechanism having the above configuration has the following problems. Each press roller assembly is usually
A displacement force is applied so as to be pressed against the drive roller at a pressure of about 3 kg. Therefore, when the release mechanism is rotated to separate the pressing roller from the surface of the driving roller when the recording paper is loaded, an extremely large operation force of 5 × 3 kg = 15 kg or more is required. In addition, since each of the pressure contact rollers is in contact with the surface of the drive roller with flexure due to the elasticity of the assembly support arm, even if the release operation is performed by the release mechanism as described above, some of the pressure contact rollers are easily driven by the drive roller. Does not separate from surface. For this reason, there has been a drawback that it is difficult to quickly and accurately perform the recording paper loading operation.

Therefore, an object of the present invention is to stably and reliably press a long sheet such as a recording sheet against a drive roller to transfer the long sheet stably, and also to use a pressing roller when the long sheet is loaded. It can be easily separated from the drive roller surface,
An object of the present invention is to provide a long sheet transfer device capable of performing a loading operation and the like quickly and accurately.

[Means for Solving the Problems] The present invention has taken the following measures to solve the above problems and achieve the object. In other words, in a long sheet transporting device that transports and drives the long sheet in the longitudinal direction by pressing a long sheet such as a recording paper against a driving roller by a pressure roller, the long sheet is provided so as to be rotated by a driving source such as a motor. The drive roller provided, a support shaft disposed in parallel with the drive roller and rotatably provided, a press-contact lever rotatably supported at a base end thereof on the support shaft, and a distal end of the press-contact lever. A pressure roller provided rotatably and provided so as to be able to come into contact with the peripheral surface of the drive roller, a support pin fixed to the support shaft, and stretched between the support pin and the pressure lever. A pressure contact spring, a cam plate fixed to the support shaft, and a rotatable operation lever having an operation pin engaged with a cam surface of the cam plate. By rotating the operation lever, , Operation pin Serial moving the engaged position to the cam surfaces to rotate the pivot pin together with the cam plate and adapted to impart or remove the elastic force by the pressure spring to press the lever.

[Action] By taking the above means, the following action is exhibited. That is, when the operation lever is rotated in one direction,
Since the elastic force of the pressure contact spring is applied to the pressure contact lever,
The pressing roller is pressed against the driving roller with a necessary and sufficient pressure. Therefore, a long sheet such as recording paper can be stably and reliably pressed against the drive roller, and the long sheet can be stably transported. When the operation lever is rotated in the other direction, the elastic force of the pressing spring is removed from the pressing lever, so that the pressing roller can be easily disengaged from the driving roller. Therefore, the pressing roller can be easily separated from the surface of the driving roller when a long sheet is loaded, and the loading operation and the like can be performed quickly and accurately.

[Application Example] First, before describing an embodiment of the present invention, an application example in which the present invention is applied to an electrostatic color plotter will be described with reference to FIGS. 1 to 10 (a) and 10 (b).

FIG. 1 is a diagram showing a schematic configuration of the entire apparatus. In FIG. 1, 1 is a fixed frame, and 2 is a movable frame. The movable frame 2 is rotatably supported at one end with respect to the fixed frame 1, and the other end can be opened and closed in the vertical direction.

The paper feed section of the movable frame 2 is provided with a roll paper holding mechanism 3. The roll paper holding mechanism 3 is a mechanism for holding a roll paper formed by winding a long recording paper 4 around a take-up shaft 5 so that the roll paper can be fed.

2 (a) (b) and 3 (a) (b) (c)
FIG. 3 is a diagram showing a configuration of the roll paper holding mechanism 3. Second
As shown in FIGS. 3A and 3B and FIGS. 3A, 3B and 3C, the roll paper holding mechanism 3 is provided so as to guide both ends of the roll paper winding shaft 5 to the roll paper holding section A. And a pair of provided guide plates 6a and 6b. As shown in FIG. 3 (b), the guide plates 6a and 6b have concave portions 7 for stably mounting the take-up shaft 5 on their upper end surfaces, and the take-up shaft 5 is smoothly rolled. A gentle slope 8 provided to be guided to the roll paper holding section A. The guide plate 6a,
A bearing member 9 made of an oil-impregnated sintered metal is fitted into a portion corresponding to each holding portion A of 6b. Guide plate 6
a, 6b, around the mounting holes 10, 11, 1
2 and sliding contact plate mounting holes 13 and 14 to be described later are provided.

In FIG. 2A, reference numeral 15 denotes a motor as a drive source, which is fixed to the movable frame 2. A clutch mechanism 16 is mounted on a rotating shaft of the motor 15. The clutch mechanism 16 automatically connects a motor drive end to one end of the winding shaft 5 guided to the roll paper holding portion A by the guide plates 6a and 6b by an engaging action of a spring-equipped clutch mechanism. This is for applying a rotational driving force to the winding shaft 5 and serves as a roll paper side clutch mechanism 17.

The clutch mechanism 17 on the roll paper side engages one end of a shaft cylinder 18 with a flange with the hollow portion of the winding shaft 5, and presses the clutch pin through a spring 19 compressed and stored in the center hole of the cylinder 18.
20 is inserted. As shown in FIG. 3A, a pair of claws 21 and 22 each having a pointed shape like an arrow are formed at the tip of the clutch pin 20, and a joint portion of the clutch mechanism 16 on the motor side is formed. And slide into engagement with a guide plate (not shown). The clutch pin 20 is always given a force in the direction of projecting outward as shown by an arrow in FIG. Therefore, the engagement and disengagement operation to the joint portion is performed smoothly and stably.

A shaft cylinder with a flange is fitted to the other end of the winding shaft 5. A sliding portion 24 is formed on the outer end surface of the shaft cylinder 23 in a slightly raised state, and one side surface of a sliding contact plate 25 as a sliding member is slidably contacted with the sliding portion 24. .
Note that a ball plunger or the like may be used as the sliding member. The sliding contact plate 25 is formed of a hard member having a good lubricating property. Both ends of the sliding contact plate 25 are guide pins 2 having coil springs wound around the guide plate 6b as shown in FIG. 3 (c).
Supported by 6, 27. The other side surface of the sliding contact plate 25 is in contact with the tip of an adjustment knob 28 as a position adjustment mechanism. Adjustment knob 28 is bolted to movable frame 2
By manually rotating the knob 30, the bolt portion 29 is moved forward and backward, and a predetermined pressing force is applied to the back surface of the sliding contact plate 25 at the tip end thereof, thereby The take-up shaft 5 is moved along the axis to adjust the end of the roll paper 4 to a specified position. The specified position can be confirmed by the tip position of the position index 31 attached to the movable frame 2 in advance. In the above-described position adjustment, the spring 19 in the clutch mechanism on the roll paper side is compressed or expanded in accordance with the rotation state of the adjustment knob 28 to allow the winding shaft 5 to move.

Returning to FIG. A transfer mechanism 32 for transferring the roll-shaped recording paper is provided at a portion where the movable frame 2 is rotatably supported with respect to the fixed frame 1. The transport mechanism 32 is a mechanism for enabling the recording paper 4 to be transported in the longitudinal direction by pressing the recording paper 4 against the peripheral surface of the driving roller 33 by the pressing roller 34.

FIGS. 4 (a) and 4 (b) are views showing a configuration of a main part of the transfer mechanism. Hereinafter, the configuration of the transfer mechanism will be described with reference to FIGS. 4 (a) and (b) and FIG.

The drive roller 33 is provided concentrically with the rotation shaft of the movable frame 2, and is configured to reduce the rotational force of the motor 35, which is a drive source, to be transmitted to rotate. A support shaft 36 is rotatably attached to the movable frame 2 in parallel with the drive roller 33. A plurality of, for example, five pressure contact levers 37 are attached to the support shaft 36 at predetermined intervals. The press-contact lever 37 has a substantially U-shape as a whole, and a base end portion of a side wall thereof is rotatably supported by a support shaft 36. At the end of the side wall of each press-contact lever 37, the press-contact roller 34
Are rotatably mounted. A shaft pin 38 is provided at a position corresponding to each of the press-contact lever mounting positions of the shaft 36.
Are respectively fixed. The support pin 38 protrudes outward through a long hole 39 provided in the center wall of the press-contact lever 37. A press-contact spring (coil spring) 41 is stretched between a tip of the support pin 38 and a support piece 40 formed by bending a base end of the press-contact lever 37.

On the other hand, a cam plate 42 is fixed to one end of the support shaft 36 (the left end in FIG. 1). The cam plate 42 has a special shape as shown. That is, the cam surface of the drive roller 33
And a small arc surface 42b substantially continuous in the circumferential direction. An operation pin 44 of an operation lever 43 is engaged with the cam surface of the cam plate 42. In this embodiment, the operation lever 43 is provided rotatably with respect to the movable frame 2 concentrically with the drive roller 33 and independently of the drive roller 33. An operation pin 44 is fixedly provided, and an operation knob 46 is provided at an extended portion of the disk portion 45.

The fixed paper guide 47 is located near the transfer mechanism 32.
And a movable paper guide 48 are arranged close to each other. The fixed paper guide 47 is a guide for guiding the recording paper 4 to the take-up roller, and is fixed. The movable paper guide 48 is a guide for guiding the recording paper 4 to the cutter roller side and for positioning the front end of the recording paper 4. The guide start end of the movable paper guide 48 corresponds to the movement of the operation pin 44 in the transfer mechanism 32. It moves toward and away from the surroundings.

The movable paper guide 48 has a holding piece 49 erected at right angles to the guide surface, and the base end of the holding piece 49 is
And are rotatably supported. And tension spring 51
4 (a) and 4 (b), the guide start end is in pressure contact with the peripheral surface of the drive roller 33. At the start of the guide, a contact portion 52 for contacting the drive roller 33 and a contact portion 53 with the front end of the recording paper are provided. The contact portion 53 is bent in an L shape, and is configured such that the front end of the recording paper 4 contacts the inner surface of the corner.

Thus, when the operation knob 46 is pushed down on the operation lever 43 of the transfer mechanism 32 as shown in FIG. 4 (a), the engagement position of the operation pin 44 on the cam surface moves upward in the figure, and the cam plate 42 Turn slightly left in the figure. At this time, since the guide start end of the movable paper guide 48 is lifted by the operation pin 44, the contact portion 52 is separated from the peripheral surface of the drive roller 33, and a passage for the recording paper 4 is formed. By the rotation of the cam plate 42, the support shaft 36 and the support shaft pin 38 integrated with the cam plate 42 also rotate. As a result, the press-contact spring 41 is extended, and the support piece 40 of the press-contact lever 37 is pulled, so that the press-contact lever 37 receives the elastic force of the press-contact spring 41 and rotates to the left in the drawing, and the press-contact roller 34 is driven by the drive roller. Press against the peripheral surface of 33. When the operation lever 43 is rotated as described above, the cam surface and the operation pin 44 are changed depending on the state of formation of the cam surface.
A relatively strong force is applied between them, so that they feel slightly "tight" as if a crescent lock were applied, but as a result of the above, even without a special locking mechanism, 4 The state of FIG. 4A is kept stable.
Thus, the recording paper 4 can be stably transported.

When the operation knob 46 of the operation lever 43 is pulled upward as shown in FIG. 4 (b), the engagement position of the operation pin 44 with the cam surface is shifted downward in the figure, and the cam plate 42 is slightly moved to the right in the figure. Rotate. At this time, the operation pin 44 is
The contact portion 52 at the guide start end comes into close contact with the peripheral surface of the drive roller 33 and shuts off the passage of the recording paper 4. With the rotation of the cam plate 42, the support shaft 36 and the support pin 38 also rotate. As a result, the stretched state of the press contact spring 41 is released, and the press contact lever 37 is
The elastic force is removed and the pressure contact force is lost. Therefore the fourth
As shown in FIG. 2B, the pressing roller 34 is separated from the driving roller 33. Actually, the turning operation of the operation lever 43 is performed in a state where the movable frame 2 is opened as described later. As a result, the position of the support shaft 36, that is, the position of the entire compression roller assembly is changed as shown in FIG. About 60 約 ~
Move to a position rotated clockwise by about 80 ゜. For this reason, when the elastic force of the press contact spring 41 stops working as shown in FIG. 4 (b), the press contact roller assembly rotates clockwise due to its own weight, and the press contact roller 34 is driven by the drive roller 33 without any other special operation. It is surely separated from.

Therefore, the front end of the recording paper 4 is driven by the driving roller 33 and the pressing roller 34.
When the recording paper 4 is inserted, the front end of the recording paper 4
Hits the inside of 53 corners. Therefore, recording paper 4
Is precisely regulated at this position. Then, when the operating lever 43 is pushed down again to the state shown in FIG. 4 (a), the pressing roller 34 presses the recording paper 4 against the peripheral surface of the driving roller 33, and the guide start end of the movable guide 48 is lifted to raise the recording paper path. Is formed. Thus, the setting operation of the recording paper 4 can be easily performed.

Returning to FIG. A recording paper setting mechanism 54 is provided in cooperation with the transfer mechanism 32. The recording paper setting mechanism 54 is a mechanism for rotating the drive roller 33 in conjunction with the opening / closing operation of the movable frame 2 to set the recording paper 4 with respect to the transport mechanism 32. 33, a reduction gear mechanism 55 interposed between the motor 35 and the driving roller 33, and a pressing roller as a recording paper pressing means.
34 are arranged in a specific arrangement relationship.

FIGS. 5A and 5B are perspective views showing the configuration of the main part of the recording paper setting mechanism 54. FIG. As described above, the movable frame 2 is rotatably supported at one end with respect to the fixed frame 1, and the driving roller 33 is provided concentrically with the rotating shaft of the movable frame 2. That is, the rotation center of the drive roller 33 and the movable frame 2 are the same.
As described above, the recording paper 4 can be pressed against the peripheral surface of the driving roller 33 by the pressing roller 34.

The motor 35 is fixed to the side wall of the movable frame 2 with mounting bolts 56, 57 and the like. A small gear 59 fixed to the rotating shaft of the motor 35 meshes with a large gear of a reduction gear 60 rotatably mounted on the same mounting base 58. The small gear of the gear 60 meshes with a gear 61 attached to a shaft end of a rotation center shaft 62 of the drive roller 33 protruding outside the fixed frame 1.

Thus, as shown in FIG. 5 (a), when the movable frame 2 is rotated to the left in the drawing and opened, the motor 35 and the reduction gear 60 integrated with the movable frame 2 are driven by the drive roller.
It turns around the turning center axis 62 of 33, and it is in the state shown in the figure. Then, when the front end of the recording paper 4 is inserted below the driving roller 33, the front end of the recording paper 4 becomes M (the position of the contact portion 53 at the guide start end of the movable paper guide 48).
Reach Here, the front end of the recording paper 4 is pressed and held by the pressing roller 34 as described above.

When the movable frame 2 is rotated rightward in the figure to a closed state as shown in FIG.
The motor 35 and the reduction gear 60 integrated with each other rotate about the rotation center axis 62 of the drive roller 33, and are in the state shown in the figure. At this time, since the motor load of the motor 35 and the load by the reduction mechanism by the reduction gear 60 are set to be larger than the total load of the driving roller 33, the pressure roller 34, and the recording paper 4, the motor 35 and the reduction gear 60 Only revolves without rotating. As a result, the gear 61 rotates,
The drive roller 33 rotates as shown by the arrow. Therefore, the recording paper 4 is wound up to the specified position N.

As described above, the recording paper setting mechanism 54 includes the movable frame 2
During the opening / closing operation, the movable frame 2 and the driving roller 33 are coupled so as to be relatively non-rotatable by the interlocking means around the motor 35 and the gear mechanism 55.
By closing the movable frame 2, the recording paper 4 can be wound up to a specified position and set in a set state. The interlocking means is not limited to the above example.

FIGS. 6 (a) and 6 (b) show a modified example thereof, in which a ratchet mechanism is used. 6 (a) and 6 (b) are at the other shaft end of the rotation center shaft 62 of the drive roller 33, that is, at one end protruding outward from the fixed frame opposite to the side where the gear mechanism 55 is provided. , The ratchet gear 63 is fitted and fixed,
A stopper member 65 having a claw 64 at one end for engaging with the ratchet gear 63 is rotatably attached to the movable frame 2 by a pin 66. At a predetermined position of the stopper member 65, an engagement release pin 67 for releasing the claw 64 from the ratchet gear 63 to release the engagement is fixedly provided. In order to regulate the range in which the stopper member 65 can rotate about the pin 66, an ellipse larger than the diameter of the disengagement pin 67 is provided at a position corresponding to the extension of the disengagement pin 67 of the movable frame 2. A hole (which may be a perfect circular arc) 68 is provided.

When the movable frame 2 is opened as shown in FIG. 6 (a), the stopper member 65 rotates together with the movable frame 2. At this time, the pawl 64 rotates while climbing over the teeth of the ratchet gear 63. To go. Therefore the drive roller
33 does not rotate at all. When the movable frame 2 is completely opened, the stopper member 65 is rotated leftward in the figure by its own weight, and the pawl 64 is engaged with the teeth of the ratchet gear. Therefore, when the movable frame 2 is closed from this state as shown in FIG. 6 (b), the ratchet gear 63 is given a left rotational force in the figure by the pawl 64 of the stop member 65, and rotates together with the movable frame 2. Then, when the movable frame 2 is brought into a state immediately before being completely closed with respect to the fixed frame 1 (a two-dot chain line state in FIG. 6B), the engagement release pin 67 contacts the upper end edge of the fixed frame 1. This state is indicated by 67 '. When the movable frame 2 is further rotated from this state to a completely closed state, the disengagement pin 67 slides on the upper edge of the fixed frame 1 and moves to the state of 67 ". As a result, the stopper member 65 is slightly rotated from the state of the two-dot chain line to the state of the solid line, and the pawl 64 is disengaged from the tooth portion of the ratchet gear 63 to be disengaged, so that the state of FIG. , The drive roller 33 can be rotated forward or backward, and the operation as a plotter can be performed without any trouble.

6 (a) and 6 (b), since the ratchet mechanism is used, the movable frame 2 and the driving roller 33 are connected to each other so that they cannot rotate relatively only when the movable frame 2 is closed. By interlocking means capable of rotating the drive roller in accordance with the closing operation of No. 2 and winding the recording paper to a predetermined position.

7 to 9 show the transfer mechanism shown in FIGS. 4 (a) and 4 (b).
FIG. 7 is a diagram sequentially illustrating an operation in a state where the recording paper setting mechanism 54 shown in FIGS. 5 (a) and (b) or FIGS. 6 (a) and (b) is combined. Since the details have already been described in detail, the points of operation including the relation with the peripheral mechanisms will be briefly described here.

FIG. 7 is a view showing a state where the movable frame 2 is opened and the operation lever 43 is pulled up. The movable frame 2 as shown in FIG.
Is opened, the press roller assembly and the like rotate right (revolve) in the figure around the drive roller 3 and come to the lower right position in the figure.
At this time, the arc-shaped paper gadget 70 fixed to the fixed frame side enters the state between the pressure roller assembly and the driving roller 33, and the leading end thereof is moved by the movable frame 2.
A guide plate that is close to and substantially continuous with the guide start end of the movable paper guide 48 that has been rotated together is formed. When the operation lever 43 is pulled up, the pressing roller 34 separates from the driving roller 33, and the guide start end of the movable paper guide 48 contacts the driving roller 33. Here, when the front end of the recording paper 4 is inserted between the guide start end of the arc-shaped paper guide 70 and the drive roller 33 via the developing head and the blotter roller 71 described later, the front end of the recording paper 4 The contact portion 53 at the guide start end is hit and positioned. In FIG. 7, reference numeral 72 denotes a recording paper 4 after the image recording is performed, which is sent to the cutter roller via a guide mechanism 73 at the time of completion, and in the middle of recording (state in which the recording of some color is performed). Is a flipper for feeding the sheet to the winding roller 74. 75 is a movable paper guide for winding, and 76
Is a fixed paper guide for winding. The movable paper guide 75 for winding is for checking the winding state of the winding roller 74,
One point 79 near the base end is pulled in the direction of the arrow by a tension spring 78 so as to be rotatable about the pin 77. The operation of the paper guide 75 will be described with reference to FIGS.

FIG. 8 shows a state in which the operation lever 43 is pressed down with the movable frame 2 opened. It also shows that the take-up movable paper guide 75 can be rotated to the position 75 'and held at that position. When the operating lever 43 is pressed down as shown in the figure, the pressing roller 34 drives the recording paper 4
33, the front end of the recording paper 4 is pressed and the movable paper guide 48 is lifted to form a recording paper passage.
When the take-up movable paper guide 75 is pulled upward by the knob 80, the paper guide 75 is rotated by an arc P
And it comes to the position of 75 '. Then, the arrow V moves from the arrow V to the arrow W with the pin 77 serving as a fulcrum supported by the tension spring 78. For this reason, the take-up movable paper guide 75
Is stably held in the 75 'position. In this state, the winding state of the recording paper 4 by the winding roller 74 is checked, and an operation of removing jammed paper or the like is performed.

FIG. 9 shows a state in which the movable frame 2 is closed from the state of FIG. When the movable frame 2 is closed as shown in FIG. 9, the pressing roller assembly and the like rotate left (revolve) around the drive roller 33 in the figure and come to the upper right position in the figure. At this time, the drive roller 33 also rotates together with the rotation of the movable frame 2, so that the front end of the recording paper 4 pressed against the drive roller 33 by the pressure roller 34 advances with the rotation of the drive roller 33 to the specified position. Get involved. When the movable frame 2 is completely closed, the coupling between the movable frame 2 and the driving roller 33 by the interlocking means is released, so that the driving roller 33 can freely rotate forward and backward. On the other hand, the take-up movable paper guide 75
Even if the movable frame 2 is closed while being opened at the position 75 ', the take-up movable paper guide at the position 75'
75 falls downward by its own weight, overcoming the tensile force of the tension spring 78. And the tension direction by the tension spring 78 is W to V
, The take-up movable paper guide 75 is
, And is automatically returned to the initial state as shown by the arc arrow Q.

Returning to FIG. Motor 35, 15 when starting recording
When the recording paper 4 is rotated, the recording paper 4 is transported in the longitudinal direction by the driving roller 33 and the like. A predetermined electrostatic latent image is first formed on the transferred recording paper by the electrostatic recording head 81,
At this time, the back surface of the recording paper 4 is pressed by the pad roller 82 so that one surface of the recording paper 4 is in close contact with the recording head 81. The pad roller 82 is formed of, for example, a rubber foam, and has appropriate elasticity. When the portion of the recording paper 4 where the electrostatic latent image is formed comes above the developing head group 83, one of the developing head groups 83 operates to perform the first color development. The recording portion where development has been performed is a blotter roller 71 (not shown in FIG. 1), a driving roller
The paper passes between the roller 33 and the pressure roller 34 and is guided to the take-up roller 74 along the fixed paper guide 47 in accordance with the direction designation of the flipper 72, and is temporarily taken out. When the first color recording is completed,
The motor 35 and the like rotate in the reverse direction, and the recording paper 4
Rewind to the side. At the time of rewinding, that is, at the time of reverse, the entire developing head group 83 is lowered for the purpose of preventing the recording portion from being stained by rubbing. The pad roller 82 is a recording head by sliding friction with the recording paper 4.
The recording head 81 is pulled upward from the surface of the recording head 81 for the purpose of preventing wear of the pad 81 and permanent deformation of the pad roller 82. By repeating the above series of steps the number of times corresponding to the total number of colors, a multi-color superimposed image for one screen is formed on a predetermined portion of the recording paper 4. However, at the time of recording the image of the last color, the flipper 72 is switched, and the recording paper 4 is sent out to the cutter roller side via the guide mechanism 73 instead of the winding roller side.

As described above, the pad roller 82 is opened and separated from the recording head 81 when the recording paper 4 is reversed.
84.

FIGS. 10 (a) and 10 (b) are diagrams showing the configuration of the pad roller contact / separation operation mechanism 84. FIG. As shown, a pad lever 85 having a rectangular shape is rotatably supported at its central portion (not necessarily exactly at the center) by a pin 86 with respect to the movable frame 2 (not shown in the figure). The whole is swingably provided like a seesaw. Above pad lever
At one end of 85, when the pad lever 85 is tilted to one side,
That is, the pad roller 82 is rotatably mounted such that when it is rotated to the lower left as shown by the arrow E, its peripheral surface can be pressed against the electrostatic recording head 81. The pad roller 82 applies a biasing force toward the electrostatic recording head by a spiral spring 87 mounted around a pin 86 so that no rattling occurs between the pad roller 82 and the shaft support of the pad lever 85. I have. At the other end of the pad lever 85, an operation element 88 having a generally isosceles triangular shape is rotatably supported at its center by a pin 89. The operation element 88 has a bottom portion bent at a right angle, and a plurality of protruding contacts 91 facing the respective heads of the developing head group 83 are provided on the outer surface of the bent piece 90. A protruding / retracting type developing head group in which a bent piece 90 provided with the contact point 91 is provided so that each head tip selectively protrudes to a prescribed position F during development.
It comes into contact with 83. Note that a tension spring 92 is stretched between one end of the pad lever 85 and the movable frame 2 so that the contact state can always be obtained. That is, the bent piece 90, which is one end of the operation element 88, is in a state of being connected to the electrostatic recording head group 83.

Thus, the pad roller contacting / separating operation mechanism 84 is provided with a pad lever 85 that swings following the movement of the developing head group 83.
Accordingly, the pad roller 82 can be automatically moved toward and away from the recording head 81.

For example, when the recording paper 4 is reversed, FIG.
As shown in (1), all the heads of the developing head group 83 are in a lowered state. The pad lever 85 is in a state of descending to the right in the figure, and the pad roller 82 is in a state of being separated from the electrostatic recording head 81. Therefore, the recording paper 4 is reversed with almost no contact with any of the developing head group 83, the recording head 81, and the pad roller 82. At the time of recording, the tenth
As shown in FIG. 7B, one of the recording heads 83, for example, 83d is in a state of protruding to the specified position F as shown in FIG. Then, one end of the operation element 88 is lifted, and accordingly, the position of the pin 89 is also raised. As a result, the pad lever 85 rotates to the left around the pin 86 in the figure, and the pad roller 82 presses the recording paper 4 against the recording head 81. Thus, an electrostatic latent image is satisfactorily formed on the recording paper 4,
Further, development is performed by the developing head 83d.

The same operation is performed even when any of the other developing heads 83a to 83c is in the protruding state. Here, even when any of the developing heads protrudes to the specified position F, the pressing position of the pad roller 82 must always be the same position.
Therefore, the pad lever during the projecting operation of each developing head
The bent piece 90 of the manipulator 88 is tapered as shown in the figure so that there is no difference between the operation strokes 85.

As means for connecting one end of the operation element 88 to the developing head group 83, in addition to the above-described example, for example, it is directly connected to a part of the developing head group 83 via a link mechanism or the like, and a tension spring is used.
92 may be omitted.

[Embodiment] As shown in FIGS. 1 and 4 (a) and 4 (b), a drive roller 33 is provided so as to be rotated by a drive source such as a motor, and a support shaft rotatable in parallel with the drive roller 33. A press-contact lever 37 having a base end rotatably supported on the support shaft 36 is provided, and a press-contact roller 34 is provided at the distal end of the press-contact lever 37 so as to be able to contact the peripheral surface of the drive roller 33. Is rotatably provided. A support pin 38 is fixed to the support shaft 36, and a press-contact spring 41 is stretched between the support pin 38 and the press-contact lever 37. Further, a cam plate 42 is fixed to one end of the support shaft 36, and a rotatable operation lever 43 in which an operation pin 44 is engaged with the cam surface of the cam plate 42 is provided. Thus, by rotating the operation lever 43, the operation pin
By moving the position of the engagement of 44 with the cam surface and rotating the support pin 38 together with the cam plate 42, the elastic force of the pressure contact spring 41 is applied to or removed from the pressure contact lever 37.

Therefore, when the operation lever 43 is rotated in one direction, the elastic force of the pressing spring 41 is applied to the pressing lever 37, so that the pressing roller 34 presses against the driving roller 33 with a necessary and sufficient pressure. Become. Therefore, the recording paper (long sheet) 4 can be stably and reliably pressed against the drive roller 33, and the recording paper (long sheet) 4 can be transferred stably. When the operation lever 43 is rotated in the other direction, the elastic force of the press contact spring 41 is removed from the press contact lever 37, so that the press contact roller 34 can be easily disengaged from the drive roller 33. Therefore, when the recording paper (long sheet) 4 is loaded, the pressing roller 34 is driven by the driving roller 33.
Can be easily separated from the surface, and the loading operation and the like can be performed quickly and accurately.

Note that the present invention is not limited to the above embodiment,
Of course, various modifications can be made without departing from the spirit of the present invention.

[Effects of the Invention] According to the present invention, a long sheet such as a recording sheet can be stably and reliably pressed against a drive roller so that the long sheet can be stably transported, as well as when a long sheet is loaded. In this case, it is possible to provide a long sheet transfer device capable of easily separating the pressing roller from the surface of the driving roller and performing the loading operation and the like quickly and accurately.

[Brief description of the drawings]

FIGS. 1 to 10 (a) and 10 (b) are views showing an application example in which the present invention is applied to an electrostatic color plotter. FIG. 1 is a perspective view showing a schematic configuration of the entire apparatus with a partial cutaway. , FIG. 2 (a)
3B is a longitudinal sectional view and a partial top view showing the configuration of a recording paper (roll paper) holding mechanism, and FIGS. 3A, 3B, and 3C are diagrams showing the configuration of each part of the recording paper holding mechanism, respectively. 4 (a) and 4 (b) are side views showing the configuration of a recording paper (long sheet) transfer mechanism (drive roller unit), and FIGS. 5 (a) and 5 (b).
6 is a partial perspective view showing a configuration of a recording paper setting mechanism, FIGS. 6 (a) and 6 (b) are side views of main parts showing a modification of the recording paper setting mechanism, and FIGS. 10 (a) and 10 (b) are side views showing the configuration of a pad roller contact / separation operation mechanism, showing the operation of the transfer mechanism in order. 1 ... fixed frame, 2 ... movable frame, 3 ... roll paper holding mechanism, 32 ... recording paper (long sheet) transport mechanism,
54: Recording paper setting mechanism, 84: Pad roller contact / separation operation mechanism.

Claims (1)

(57) [Claims] 1. A long sheet transfer device for transferring a long sheet in a longitudinal direction by pressing the long sheet against a drive roller by a pressure roller, wherein the drive roller is provided to be rotated by a drive source. A support shaft disposed in parallel with the drive roller and rotatably provided; a press-contact lever rotatably supported at a base end thereof on the support shaft; and a rotatably provided at a distal end of the press-contact lever. A pressure contact roller provided so as to be able to contact the peripheral surface of the drive roller, a support pin fixed to the support shaft, and a pressure contact spring stretched between the support pin and the pressure contact lever. A cam plate fixed to the support shaft, and a rotatable operation lever having an operation pin engaged with a cam surface of the cam plate. The operation pin is rotated by rotating the operation lever. Engagement with the cam surface A long sheet transfer device, wherein the engagement position is moved to rotate the support pin together with the cam plate to apply or remove the elastic force of the press-contact spring to or from the press-contact lever.