JPH0912190A - Winding curl preventing mechanism - Google Patents

Abstract

PURPOSE: To prevent a winding curl for continuous recording materials. CONSTITUTION: Continuous recording materials 6 are carried by a rotary feeding roller 1 and a tension roller unit 5 pressure-contacted with this. Pressure contact by the tension roller 5 is released during power OFF for a device and thereby a winding curl is prevented for the recording materials. For releasing pressure contact, an air cylinder 8 reciprocating in the arrow direction B or its reverse direction in response to switching ON/OFF of the device power is used and during power OFF for the device, the tension roller is held in a pressure contact release condition. Instead of the air cylinder, a solenoid is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curl prevention mechanism, and more particularly to a curl prevention mechanism in a plotter device.

[0002]

2. Description of the Related Art There is known a plotter device having a magazine box in which a recording photosensitive material made of paper or film base is stored in a roll form inside the device. This device draws images and document data that are impositioned and edited on a workstation on a recording material conveyed from a magazine box.

This type of plotter device is provided with a sensitive material feeding mechanism for feeding the recording sensitive material to the platen. This platen is for fixing the position of the recording material in order to draw the recording data on the recording material.

A general sensitive material feeding mechanism will be described with reference to FIG. The schematic structure of the sensitive material feeding mechanism is shown in FIG. This mechanism comprises a feed roller 1 whose rotation amount is controlled by a motor in order to feed the recording material to the platen.
And a tension roller unit 5 provided near the roller, and a spring 7 for urging the unit 5 toward the feed roller 1.

The tension roller unit 5 comprises a roller 2 whose axial position is fixed and an axially position-free roller 3 which is rotatably coupled to the roller 2 via a belt 4. Since the unit 5 is biased by the spring 7 in the direction of pressing the feed roller 1, the belt 4 is pressed against the feed roller 1. As a result, the recording material 6 is in close contact with the feed roller 1. Reference numeral 61 is a guide for the photosensitive material.

The shaft portion 100 of the feed roller 1 is fixed to the side plate 11 via a bearing, and the rotation of the feed roller 1 is controlled in the arrow A direction or the opposite direction by a motor (not shown).

A guide plate 17 is provided to guide the recording material 6 between the feed roller 1 and the belt 4. A screw 18 is fixed to the guide plate 17, and one end of the spring 7 is fixed to the screw 18. The other end of the spring 7 is fixed to the hole provided in the unit 5.

Both ends of the roller 2 are sandwiched by side plates 11, and the side plate 50 of the unit 5 is provided outside the side plate 11.
Is provided.

In such a structure, the feed roller 1 is rotated in the direction of arrow A, so that the recording photosensitive material is conveyed to the plate table (not shown), and data is drawn on the recording photosensitive material. In addition,
Generally, a guide is provided for guiding the conveyance from the feed roller 1 to the platen.

[0010]

In the surface plotter apparatus, the recording sensitive material is discharged from the printing plate after drawing the data on the recording sensitive material. Then, the printed recording material is cut to a predetermined size by a cutter (not shown) in the apparatus, and then discharged to the outside of the apparatus.

The recording material in the apparatus cut by the cutter is rewound to a predetermined position by the feed roller rotating in the direction opposite to the arrow A. That is, by rewinding so that the front end of the recording photosensitive material is positioned on the plate table, the writing start position on the recording photosensitive material at the time of drawing is adjusted. During this alignment, the recording sensitive material rewound at the sensitive material feeding mechanism is bent.

In this case, due to the pressing of the feed roller 1 and the belt 4 of the sensitive material feeding mechanism against the recording sensitive material, the recording sensitive material is bent with a strong curvature having several inflection points. If the recording sensitive material is left in this state for a long time, curling due to this bending will be attached to the recording sensitive material. At the time of drawing the recording data, the recording photosensitive material is vacuum-adsorbed and fixed on the plate base by air, but this winding curl has a drawback that it causes adsorption failure. Therefore, the drawing result may be poor.

The techniques disclosed in JP-A-3-172267 and JP-A-3-166858 relate to pressure control between the recording head and the platen, and the above-mentioned drawbacks cannot be solved. Can not.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and the object thereof is to prevent the recording material from being curled even when the apparatus is not used for a long time. It is to provide a curl prevention mechanism.

[0015]

A curling prevention mechanism according to the present invention includes a feed roller for feeding a continuous recording material by rotating, and a drawing roller for pressing a feed surface of the feed roller. In the winding curl prevention mechanism, the pressure contact release means for releasing the pressure contact of the tension roller when the apparatus power is off is included.

[0016]

In a drawing device that conveys a continuous recording material by a rotating feed roller and a tension roller that is pressed against this, the pressing of the tension roller is released when the power of the device is turned off, and the recording material is prevented from being curled. To do. To release the pressure contact, an actuator that reciprocates in response to power-on / off of the device is used, and the tension roller is held in either the pressure contact state or the pressure contact release state in accordance with the reciprocal movement of the actuator. The actuator used for releasing the pressure contact is, for example, an air cylinder or a solenoid.

[0017]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic block diagram showing the operating state of the curl-prevention mechanism according to the first embodiment of the present invention when the device is powered on, and FIG. 2 is the power-off of the curl-prevention mechanism according to the same embodiment. It is a schematic block diagram which shows the operation state in a state. In both figures, the same parts as those in FIG. 5 are designated by the same reference numerals.

As shown in FIG. 1, in this mechanism, a feeding roller 1 whose rotation amount is controlled by a motor for feeding a recording photosensitive material to a platen, and a tension provided near this roller. The roller unit 5 and the spring 7 that biases the unit 5 toward the feed roller 1 are included.

The tension roller unit 5 comprises a roller 2 whose axial position is fixed and an axial position free roller 3 which is rotatably coupled to the roller 2 via a belt 4. Since the unit 5 is biased by the spring 7 in the direction of pressing the feed roller 1, the belt 4 is pressed against the feed roller 1. As a result, the recording material 6 is in close contact with the feed roller 1.

The above construction is similar to that of FIG. In this mechanism, in addition to the above configuration, an air cylinder 8 in which the pin portion 80 at the tip reciprocates in the direction of arrow B or the opposite direction, and an air cylinder receiver 9 provided in the tension roller unit 5 for receiving the pin portion 80. It is configured to include.

The air cylinder 8 is fixed to the hole of the fixing plate 83, and the joint 82 has the air tube 13 attached thereto.
The compressed air sent through is supplied. The compressed air is supplied or cut off by the solenoid valve 12. When the compressed air is not supplied, the pin portion 80 is pulled (not protruding) as shown in FIG. On the other hand, when compressed air is being supplied, the pin portion 80 projects in the direction of arrow B as shown in FIG.

The solenoid valve 12 is opened to supply compressed air when the power source of the apparatus is off, and closed when the power source is on to cut off the supply. Therefore, when the power source of the device is in the on state, the pin portion 80 does not project, and when the power source is in the off state, the pin portion 80 projects.

The fixed plate 83 has a screw 81a on the side plate 11.
And 81b, a part of which is bent and extends toward the front side perpendicular to the paper surface. Further, it bends from the middle of the vertical extension and extends horizontally with respect to the paper surface. Then, it bends from the middle of the horizontal extension and extends to the front side perpendicular to the paper surface, a hole is provided in the middle, and the air cylinder 8 is fixed to the hole by a nut.

The air cylinder receiver 9 is screwed to the side plate 50 of the tension roller unit 5, and a part of the air cylinder receiver 9 is bent toward the front side perpendicular to the paper surface. When the projecting pin portion 80 comes into contact with the bent portion, the unit 5 rotates around the rotation axis of the roller 2. This rotational movement causes the unit 5 to move from the position shown in FIG. 1 to the position shown in FIG. Further, a stopper 10 is provided on the side plate 11 in order to regulate the rotational movement range of the unit 5.

In short, the unit 5 as a whole comprises a tension roller, and the pressure contact state of the tension roller with the feed roller 1 is controlled by the actuator. That is, an air cylinder 8 which is an actuator is newly provided, and the feed roller 1 and the tension roller unit 5 are pressed into contact with each other by controlling the protruding state of the pin portion 80 of the air cylinder 8 according to the on / off state of the device power supply. It is held in either one of the pressure contact release state and the pressure contact release state.

In such a structure, when the power of the plotter device is input and the power is on (FIG. 1), the positional relationship between the recording photosensitive material 6 and each roller is the same as in FIG. That is, the recording material 6 is sandwiched by the feed roller 1 and the tension roller unit 5 composed of the rollers 2 and 3 connected by the belt 4. In this case, the solenoid valve 12 is in a closed state, and compressed air is not supplied to the air cylinder 8. Therefore, the pin portion 80 of the air cylinder 8 is in the pulled state, and the unit 5 is in pressure contact with the feed roller 1. At this time, the side plate 50 of the unit 5 is not in contact with the stopper 10.

On the other hand, in the case where the plotter device is turned off because the device is not used for a long time (FIG. 2), the solenoid valve 12 is open. As a result, the compressed air is transmitted through the air tube 13 and flows into the air cylinder 8, and the pin portion 80 of the air cylinder 8 projects. Due to this protrusion, the air cylinder receiver 9 is pushed by the pin portion 80, and the unit 5 rotates about the rotation axis of the roller 2 serving as a fulcrum. This rotational movement moves the unit 5 from the position shown in FIG. 1 to the position shown in FIG. 2 and the spring 7 is in the extended state. Therefore, the unit 5 is in a floating state (not in pressure contact) with the recording photosensitive material. At this time, the side plate 50 of the unit 5 contacts the stopper 10 and is regulated so that the unit 5 does not rotate too much.

Next, a second embodiment using a solenoid as an actuator instead of the air cylinder will be described with reference to FIGS. 3 and 4. In both figures, the same parts as those in FIGS. 1, 2 and 5 are designated by the same reference numerals.

In this case, the solenoid 14 is fixed to the hole of the fixing plate 83, as shown in FIG. And
When the device power is on, the solenoid power supply 16 energizes the solenoid 14, and when the power is off, it does not energize. When the solenoid 14 is in the energized state, the pin portion 80 at the tip is retracted, and in the non-energized state, the pin portion 80 is in a state of protruding in the direction of the arrow B. The unit 5 is provided with a solenoid receiver 15 similar to the air cylinder receiver 9 in FIG.

In such a configuration, when the power of the plotter device is being input and the power is on (FIG. 3), the positional relationship between the recording material 6 and each roller is the same as in FIG. That is, the recording material 6 is sandwiched by the feed roller 1 and the tension roller unit 5 composed of the rollers 2 and 3 connected by the belt 4. In this case, the solenoid 14 is energized, the pin portion 80 is pulled, and the unit 5 is pressed against the feed roller 1. At this time, the side plate 50 of the unit 5 is attached to the stopper 10
Not in contact with.

On the other hand, when the apparatus is not used for a long time and the plotter apparatus is powered off (FIG. 4), the solenoid 14 is de-energized and the pin portion 80 is projected. Becomes Due to this protrusion, the solenoid receiver 15 is pushed by the pin portion 80, and the unit 5 rotates around the rotation axis of the roller 2 serving as a fulcrum. This rotational movement moves the unit 5 from the position shown in FIG. 3 to the position shown in FIG. 4 and the spring 7 is in the extended state. Therefore, the unit 5 is in a floating state (not in pressure contact) with the recording photosensitive material. At this time, the side plate 50 of the unit 5 contacts the stopper 10 and is regulated so that the unit 5 does not rotate too much.

As described above, by preventing the curling, the recording photosensitive material can be firmly adsorbed and fixed to the plate stand (not shown), and the drawing result is not deteriorated.

In the above description, the recording photosensitive material in the plotter device is used as a problem, but it is obvious that the present invention can be widely applied to roll recording materials.

The present invention can take the following aspects in connection with the description of the claims.

(5) The air cylinder has a pin portion that reciprocates so as to be in a protruding state and a non-projecting state, and the tension roller has a receiving portion that abuts on the pin portion when the pin portion is in a protruding state. The curl-preventing mechanism according to claim 3, characterized in that.

(6) The solenoid has a pin portion that reciprocates so as to be in a protruding state and a non-projecting state, and the tension roller has a receiving portion that abuts on the pin portion when the pin portion is in a protruding state. 5. The method according to claim 4, wherein
The curl prevention mechanism described.

(7) The tension roller includes a pair of rollers, and a belt wound around the rollers and transmitting a rotational force to each other. The curling prevention mechanism described in any of the above.

[0039]

As described above, the present invention has the effect of preventing the recording material from being curled by releasing the pressure contact by the tension roller when the power source of the apparatus is turned off.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an operation state of a curling prevention mechanism according to a first embodiment of the present invention when a device power is turned on.

FIG. 2 is a schematic configuration diagram showing an operating state of the winding curl prevention mechanism according to the first embodiment of the present invention when the apparatus power is off.

FIG. 3 is a schematic configuration diagram showing an operating state of the winding curl prevention mechanism according to the second embodiment of the present invention when the apparatus power is on.

FIG. 4 is a schematic configuration diagram showing an operating state of the curl-preventing mechanism according to the second embodiment of the present invention when the device power is off.

FIG. 5 is a schematic configuration diagram of a general sensitive material feeding mechanism.

[Explanation of symbols]

 1 Feed Roller 2, 3 Roller 4 Belt 5 Tension Roller Unit 6 Recording Sensitive Material 7 Spring 8 Air Cylinder 9 Air Cylinder Receiver 10 Stopper 11, 50 Side Plate 12 Solenoid Valve 13 Tube 14 Solenoid 15 Solenoid Receiver 16 Solenoid Power Supply 17 Guide Plate 18 screw

Claims (4)

[Claims] 1. A curling preventive mechanism in a drawing apparatus, comprising a feed roller which conveys a continuous recording material by rotating, and a tension roller which is brought into pressure contact with the conveying surface of the feed roller. 2. A curl-preventing mechanism, comprising: pressure contact releasing means for releasing pressure contact of the tension roller. 2. The pressure contact releasing means includes an actuator that reciprocates in response to power on / off of the apparatus, and the tension roller is brought into one of a pressure contact state and a pressure contact release state in accordance with the reciprocating motion of the actuator. The curling prevention mechanism according to claim 1, wherein the mechanism is held. 3. The curling prevention mechanism according to claim 2, wherein the actuator is an air cylinder that reciprocates in response to power-on / off of the apparatus. 4. The curling prevention mechanism according to claim 2, wherein the actuator is a solenoid that reciprocates in response to power on / off of the apparatus.