JPS6011863Y2 - Roll sheet conveyance braking device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rolled sheet conveyance braking device and is an improvement of the invention described in Japanese Patent Application No. 152578/1983 (Japanese Patent Application Laid-Open No. 84734/1989) previously filed by the applicant of the present invention.

The prior invention includes a loading means for loading a rolled sheet wound into a roll, a conveying means for holding the rolled sheet pulled out from the loading means, and a conveying means for loading the rolled sheet when the rolled sheet is pulled out from the loading means. a rotational force accumulating means for accumulating rotational force of the rolled sheet in the returning direction; and a rotational force accumulating means for accumulating the rotational force of the rolled sheet in the returning direction; This is a roll sheet loosening prevention device comprising a release means for opening the rotational force accumulating means and rotating the roll sheet in a direction to unwind it.

In this prior invention, a mainspring serving as a rotational force accumulating means accumulates rotational force in the direction of rewinding the rolled sheet by pulling out the sheet from the rolled sheet.

Therefore, even after the accumulation is released and the slack in the sheet is removed, the sheet is still pulled out by the rollers that serve as the conveying means, so the mainspring accumulates a rotational force in the direction of rewinding the sheet, which causes the tension in the sheet. is maintained.

On the other hand, in order to accumulate rotational force in a mainspring, its outer end must be fixed and its inner end must be wound tightly.

However, if the outer end is completely fixed, it becomes impossible to pull out the sheet from the roll sheet after the mainspring reaches its maximum charge.

Therefore, in order to allow the sheet to be pulled out by the conveyor roller even after the mainspring reaches its maximum charge, the outer end of the mainspring is not completely fixed, and this is done by braking force to increase the force for pulling out the sheet. The brake force should be greater than this, and the mainspring's maximum charging force should be smaller than this brake force.

The unwinding force of the rolled sheet depends on the mainspring's charging force, so in order to obtain an appropriate unwinding force, a greater braking force is required.In order to convey the sheet against this braking force, Even greater driving conveyance force is required.

As a result, a large load is applied to the seat drive system.

Furthermore, since the sheet is conveyed against the braking force, the brake member wears out quickly, and the braking force decreases, making it impossible to store force using the mainspring.

This invention aims to improve the above-mentioned prior invention, and in contrast to the structure of the above-mentioned prior invention, after removing the slack in the sheet, the mainspring, which is the rotational force accumulating means, is set in a free state, and the mainspring, which is the rotational force accumulating means, is set in a free state, and This system has an additional structure that applies braking to maintain the tension of the seat.

As a result, the braking force acts solely for the force storage action of the mainspring, and the conveyance of the sheet is performed against the slight braking force on the roll support member necessary to maintain the tension of the sheet. The load on the seat drive system can be reduced, and changes over time due to wear and the like of the brake members are also reduced, so stable performance can be maintained.

Since this invention is almost the same as the prior invention except for the additional requirements mentioned above, the prior invention will be explained below first.

In an electrostatic recording facsimile, for example, a roll sheet made of electrostatic recording paper is used, and a pair of transport rollers that pull out the end of the rolled sheet and are placed at a predetermined position in the pulling direction. The sheet is conveyed in a predetermined direction by the rotational feeding action of.

Some facsimile machines having such a paper feeding mechanism are designed to open the sheet conveyance path.

FIG. 1 shows an example of this type of facsimile machine, in which an upper body 2 can be opened and closed about a shaft 3 with respect to a main body 1 of the machine.

The apparatus body 1 is provided with a roll sheet 4, a recording electrode 5, a developing device 6, etc., and the upper body 2 is provided with an upper roller 7 of a pair of transport rollers 7, 8, driven rollers 1G, 11, A fixing heater 12, a pair of discharge conveyance rollers 13, and the like are provided.

Then, the sheet pulled out from the roll sheet 4 is sent in the direction of arrow a by the rotational feeding action of the pair of transport rollers 13.

At this time, an electrostatic latent image is formed on the sheet by the recording electrode 5, and this latent image is made visible by the developing device 6.

Then, this visible image is fixed by the fixing heater 12, so that a received image corresponding to the original image on the transmitting side is obtained on the sheet.

By the way, as mentioned earlier, the upper body 2 of this facsimile machine can be opened.
When the upper body 2 is released as shown by the imaginary line in FIG. 1, the sheet conveying path can be released, making it easy to clear jams, maintain equipment, or load rolled sheets.

In this type of facsimile machine that opens and closes the upper body,
When setting the roll sheet 4, first, with the upper body 2 open, load the roll sheet in the position shown in the figure, pull out the sheet, and hold the leading end of the sheet between the pair of discharge conveyance rollers 13. Keep the sheet stretched.

From this state, when the upper body 2 is closed to the position shown by the solid line,
The sheet is slackened between the pair of transport rollers 13 and the roll sheet 4.

That is, the cause of this slackness is that the position of the rotating shaft 3 of the upper body 2 is biased to the right with respect to the center position of the rolled sheet 4, so that when the upper body 2 is released, The seat length corresponds to the distance from the position indicated by the symbol A to the B position and reaches the C position, while the seat length corresponds to the distance from the A position to the D position when the upper body 2 is closed. This is because the sheet length becomes shorter.

Also, in order to eliminate this drawback, it is possible to make the axes of the roll sheet 4 and the shaft 3 coincide with each other, but even if this is done, as long as the roll sheet 4 does not rotate together with the upper body 2, , a slack is generated by the length of the seat from position A to position B, which corresponds to the rotation angle of the upper body.

Furthermore, when the upper body 2, which is in the closed state as shown in the figure, is released for some reason such as toner replenishment, the leading edge of the sheet is gripped by a pair of discharge conveyance rollers 13 with a predetermined frictional force. , an abnormal tension is momentarily applied to the sheet, which can cause damage or skew.

Further, when an abnormal tension is applied to the sheet, there is a risk that the rolled sheet 4 will idle in the clockwise direction in the figure due to this tension, causing the sheet to become more slack than necessary.

In order to deal with this problem, it is possible to take measures such as a brake to brake the clockwise rotation of the roll sheet 4, but on the other hand, the upper body 2
When releasing, the tension applied to the sheet increases,
This may also cause damage to the sheet.

Such a drawback is not limited to facsimile machines, but is a common problem in electrophotographic copying machines equipped with this type of paper feeding device and various devices similar thereto.

An object of the prior invention is to provide a roll sheet loosening prevention device that eliminates the above-mentioned drawbacks.

FIG. 2 shows a side view of essential parts of the prior invention device, and FIG. 3 shows an exploded perspective view of the same device, and this device is installed in the device main body 1 shown in FIG. 1.

In FIGS. 2 and 3, a rolled sheet 4, which is a rolled sheet, is attached at its center to a holder 14, and is detachable from the holder.

A shaft groove 14b is provided in the shaft 14a of the holder 14, and this portion corresponds to a guide groove 15 provided in the bracket 15.
It is fitted into a from above.

The base of the bracket 15 is fixed to the immovable substrate 16, and a bracket configured similarly to this is attached to the roll sheet 4.
By installing the holder 14 in the guide groove 15a (not shown on the other side) of both brackets, the roll sheet 4 can rotate freely and integrally with the holder 14. It is held stationary in the axial direction.

In this way, the holder 14 and the bracket 15 constitute a loading means for loading the roll sheet 4.

A gear 17 is fixed to the shaft end of the shaft 14a of the holder 14, and this gear 17, the holder 14, and the roll sheet 4
are substantially integrated.

Note that the gear 17 and the holder 14 are not integrated, but their shafts are coupled by a joint, so that the shaft of the gear 17 is supported by the device board, and the holder 14 is connected to the shaft of the gear.
It may be configured so that it can be attached and detached.

A lock lever 20 whose base is pivotally connected to the shaft 19 achieves a locking function to prevent the holder shaft 14a from moving upward, and manually moves the lever 20 in the direction of the arrow against the elasticity of the spring 22. By rotating the holder shaft 14a, the locked state of the holder shaft 14a is released, and the roll sheet 4, holder 14, and gear 17 can be taken out integrally from the guide groove 15a.

A pin 20a is fixed to the lock lever 20, and the pin 20a is pressed against the inner peripheral edge of one side of a hole 15b provided in the bracket 15 by the elasticity of a spring 22.

Then, by rotating the lock lever 20 in the direction of the arrow, the holder shaft 14a can be pulled out upward while the pin 20a is in contact with the inner peripheral edge on the other side.

A gear 1B having a boss portion 18a meshes with the gear 17, and a mainspring 23 is fitted into the outer periphery of the boss portion 18a of this gear.

One end 23a of the mainspring 23 is fixed to the groove 18b of the boss portion 18a, and the other end 23b is fixed to the mainspring case 24.
The locking pin 25 is locked to the peripheral wall of the housing.

As shown in FIG. 5, the mainspring case 24 is fitted onto the shaft 26 and is prevented from being removed from the shaft 26 by a set screw 29.

The shaft 26 is rotatably supported by both immovable side plates 27, 28, and the gear 18 is fitted onto this shaft 26.

A mounting portion 26a formed on one end of the shaft 26 and having a flat notch on both sides of the top of the shaft is provided with a stopper member 3.
1 is fitted into the mounting hole 31a.

The stopper member 31 is adjacent to the gear 18 as shown in FIG. They are designed to collide by action.

The positional relationship between the pin 18c and the stopper member 31 in the flat state is as shown in FIG.

In FIGS. 2 and 3, a brake member 33 made of a material such as cork is in pressure contact with the circumferential surface of the boss portion 24a of the mainspring case 24.
It is fixed to the free end of the leaf spring 34.

The base of the leaf spring 34 is fixed to a member 35 with screws 36, and the member 35 is fixed to the immovable side plate 28.

For installation, a brake force adjustment screw 37 whose tip is in contact with the leaf spring 34 is screwed into the member 35.
By appropriately rotating 7, the braking force applied to the mainspring case 24 by the brake member 33 can be adjusted.

Note that details regarding this will be described later.

A shaft 38 arranged parallel to the shaft 26 is connected to both immovable side plates 27.
．． 28, and a locking lever 41 is pivotally mounted on this shaft 38.

The lever 41 has a second
In the figure, the habit of rotating counterclockwise around the shaft 38 is given, and the rotation due to this habit is blocked by a pin 43a installed in the operating lever 43, which will be described later. Gear 1 formed on locking lever 41
A locking pawl 41a that can be freely engaged and detached from the gear 18 is held in a position spaced apart from the teeth of the gear 18.

The base of the operating lever 43 and the locking lever 41 are pivotally connected to the shaft 38, and the operating lever 43 is rotated clockwise around the shaft 38 in FIG. The lever 43 has a habit of moving, and rotation due to this habit is prevented by the side edge of the lever 43 coming into contact with the tip edge 45a of the locking plate 45 attached to the immovable base plate 16.

Note that the elasticity of the spring 44 is stronger than the elasticity of the spring 42 attached to the locking lever 41, so that both levers 41, 43 are held in the position shown in FIG.

In addition, in FIG. 1, the base of the pushing member 47 is fixed to the support member 46 fixedly provided to the upper body 2.
As the upper body 2 is opened, the tip of the pushing member 47 pushes the free end of the operating lever 43, as shown in FIG. 4, and rotates the lever 43 counterclockwise around the shaft 38. It is designed to move.

Next, the operation of the prior invention device will be explained.

In FIG. 1, it is assumed that the upper body 2 is in the closed state as shown in the figure, and the roll sheet 4 has not yet been loaded. From this state, the upper body 2 is rotated in the direction of the arrow around the shaft 3. When the pushing member 47 is moved and opened to the imaginary line position, the pushing member 47, which is substantially integral with the upper body 2, rotates around the shaft 3, and its tip end is connected to the operating lever 43 shown in FIG. abuts against the free end side edge of and pushes it away.

That is, in FIG. 2, the operating lever 43 rotates counterclockwise around the shaft 38 against the elasticity of the spring 44 to the position shown in FIG. 4.

Immediately responding to this movement, the locking lever 41 whose rotation was restricted by the pin 43a is pulled by the spring 42 and rotates counterclockwise around the shaft 38, and the locking claw 41a is rotated as shown in FIG. It engages with the teeth of the gear 18 as shown.

After performing the above operations, as shown in Figure 3,
Attach the roll sheet 4 to the holder 14.

In this state, the holder 14 and gear 17 for the roll sheet 4 are integrated.

Then, the shaft groove 14b portion of the holder shaft 14a is fitted into the guide 115a of the bracket 15 from above.

In this state, the gear 17 meshes with the gear 18, and the roll sheet 4 is positioned and loaded at the correct paper feeding position.

Next, from this state, the sheet end of the roll sheet 4 is pulled out in the direction of the arrow as shown in FIG. The tip of the paper is held by a pair of discharge conveyance rollers 13 serving as conveyance means.

Then, the pair of discharge and conveyance rollers 13 are manually rotated as appropriate to bring the sheet into a stretched state as shown in the figure.

By the way, in FIG. 3, when the roll sheet 4 is pulled out, the gear 17 rotates in the direction of the solid line arrow, and therefore the gear 18 that meshes with it also rotates around the shaft 26 in the direction of the solid line arrow.

At this time, as shown in FIG. 6, the locking pawl 41a of the locking lever 41 is in a state of engagement with the gear 18, but as the gear 18 rotates in the direction of the solid arrow, the locking pawl 41a 41a
passes over the teeth of the gear one after another.

That is, the locking lever 41 locks the shaft 3 under the elasticity of the spring 42.
It oscillates intermittently around 8.

When the gear 18 is about to rotate in the direction of the dotted arrow, the locking lever 41 bites into the gear 18, so that the locking pawl 41a of the locking lever 41 prevents the gear 18 from rotating in the direction of the dotted arrow. It is.

That is, if the direction of the dotted line arrow of the gear 18 is defined as the reverse direction, the above-described mechanism constitutes a type of reverse rotation prevention mechanism.

Here, in FIG. 3, it has already been mentioned that by pulling out the sheet end of the roll sheet 4 in the direction of the arrow, the gears 17 and 18 rotate in the direction of the solid arrow. With rotation in the direction of the solid arrow, one end 23a is fixed to the boss portion 18a, and the other end 23a is fixed to the boss portion 18a.
The mainspring 23 whose portion 3b is locked to the mainspring case 24 by the locking pin 25 is wound up.

At this time, the mainspring case 24 is kept in a non-rotating state by the braking action of the brake member 33.

Then, when the gear 18 rotates, for example, approximately 90 degrees, that is,
In FIG. 4, the pin 18c implanted in the gear 18 is displaced from the initial position shown in the figure in the direction of the arrow, and the pin 18c is
, abuts against the left side edge of the stopper piece 31b of the stopper member 31, and pushes the stopper piece 31b away.

Then, the stopper member 31 is pushed counterclockwise in the figure, and accordingly, the shaft 26 and the mainspring case 24 are rotated counterclockwise together.

In this case, the case 24 rotates while slipping with respect to the brake member 33.

That is, this rotation is performed against the braking force of the brake member 33 after the pin 18c collides with the stopper member 31.

Then, the pin 18c is connected to the stopper piece 3 of the stopper member 31.
1b, the member 31, shaft 26, mainspring case 24, gear 18, etc. are pulled out and the leading ends of the sheets are connected to the pair of discharge conveyance rollers 1 in FIG.
They continue to rotate as one until they are held in place by 3.

In this state, the pin 18c and the stopper member 31 are at arbitrary positions.

To summarize the above points, the roll sheet 4 is first pulled out in the first step against the elasticity of the mainspring 23, and in the second step against the braking force of the brake member 33. .

In the first stage, that is, the pin 18c of the gear 18
The mainspring 23 is wound and tightened until it rotates around the shaft 26 from the position shown in FIG. Energy is accumulated accordingly.

That is, this stored elasticity gives the gear 18 a rotational habit in the direction of the dotted arrow, and at the same time gives the roll sheet 4 a rotational habit in the direction of rewinding it.

Therefore, the mainspring 23 constitutes a rotational force accumulating means for accumulating the rotational force of the rolled sheet in the direction of rewinding the rolled sheet.

In addition, in FIG. 4, when the rolled sheet is forcibly pulled out against the elasticity of the mainspring 23 in the first stage,
Even if you release your finger from the edge of the sheet in this state, the rotation of the gear 18 in the direction of the dotted arrow shown in FIG. There is no fear that it will be pulled back in the direction by the elasticity of the mainspring 23, which is convenient for setting the roll sheet.

That is, at this time, the locking lever 41 performs the reverse rotation prevention function.

At this moment, the upper body 2 is in a released state, and the leading end of the roll sheet 4 is held by a pair of discharge conveyance rollers 13, so that the sheet is stretched as shown in the figure.

Further, in FIG. 4, the locking pawl 41a of the locking lever 41 is in a state of being engaged with the gear 18.

When the upper body 2 shown in FIG. 1 is closed from this state, the tip of the pushing member 47 shown in FIG. 4 is retracted from the free end side edge of the operating lever 43.

As a result, the actuating lever 43 is rotated by a spring 44 around the shaft 38.
It is pulled by and rotates clockwise until it comes into contact with the locking plate 45, and returns to the original position shown in FIG.

Therefore, the locking lever 41 is also pushed and moved by the pin 43a and rotates clockwise around the shaft 38 against the elasticity of the spring 42, and at this time the locking pawl 41a is separated from the gear 18.

Due to the above-described separation movement of the locking pawl 41a, the gear 18, whose rotation in the direction of the dotted arrow has been restricted until now by the locking pawl 41a, begins to rotate in that direction.

That is, the gear 18 rotates in the direction of the dotted arrow due to the stored elasticity of the mainspring 23.

On the other hand, irrespective of the rotation of the gear 18, the mainspring case 24 shown in FIG. 3 is held in a non-rotating state together with the shaft 26 by the braking force of the brake member 33.

Note that the rotation of the gear 18 in the direction of the dotted arrow as described above is performed until the stored elasticity of the mainspring 23 is completely released.
The amount of rotation corresponds to the angle θ shown in FIG.

Now, as mentioned above, when the gear 18 rotates in the direction of the dotted line arrow due to the stored elasticity of the mainspring 23, the gear 17 that meshes with it also rotates in the direction of the dotted line arrow, and at the same time,
The roll sheet 4 also rotates in the same direction, and as shown in FIG. state.

To summarize the above points, the roll sheet automatically rotates in the unwinding direction as the upper body 2 closes, and at this time, the slack in the sheet is removed and the sheet is stretched. It will become.

The roll sheet 4 is rotated in the unwinding direction by releasing the stored elasticity of the mainspring 23.

In other words, the mainspring 21 is used as a rotational force accumulating means for rewinding the roll sheet, and the locking lever 41 is used as a release means for releasing the accumulating means.

The amount of elasticity stored in the mainspring 23 is set so that the sheet is stretched after unwinding the slack part of the roll sheet, but it can be adjusted as necessary. .

That is, in the embodiment of the prior invention, the adjustment is made by loosening the setscrew 29 for fixing the mainspring case 24, and then tightening the shaft 2.
This is done by appropriately rotating the case 24 with respect to 6 and changing the angle θ shown in FIG.

By the way, in FIG. 7, one side roller of the discharge conveyance roller pair 13 is provided with a well-known reverse rotation prevention mechanism, for example, a one-way rotation clutch 13a, and when the drive shaft 13b rotates clockwise in the figure, this The rotational force is transmitted to the roller 13 via the clutch 13a, and the roller 13 rotates in the direction indicated by the arrow to feed the sheet in the direction of the arrow.

Further, when setting a sheet, the roller 13 is manually rotated independently with respect to the drive shaft 13b in the direction of the arrow, so that the tip of the sheet can be easily gripped.

Further, the function of the one-way rotation clutch 13a prevents the roller 13 from rotating in the opposite direction.

Therefore, as explained in the previous paragraph, when the sheet transitions from the slack state to the tensioned state, the pair of conveyor rollers
Since it does not rotate in the opposite direction, there is no risk of the sheet being pulled back, which is convenient.

Through the above process, the slack in the seat that occurs during the closing operation of the upper body 2 is removed, and the upper body 2 is held in the closed state as shown by the solid line in FIG.

Setting of the roll sheet is completed in this state, and feeding of the sheet is started from this state.

That is, the sheet is fed in the direction of arrow a and pulled out from the roll sheet 4 by the rotational feeding action of the discharge conveyance roller pair 13.

At this time, the roll sheet 4 rotates clockwise in FIG. 2, and therefore the gear 17 also rotates in the same direction, that is, in the direction of the solid arrow.

Therefore, the gear 18 similarly rotates in the direction of the solid arrow, and the mainspring 23 is first wound up (see FIG. 3) in the same manner as in the operation when drawing out the sheet described above.

Then, after the pin 18c of the gear 18 comes into contact with the stopper piece 31b of the stopper member 31, the gear 18, the stopper member 31, and the mainspring case 24 maintain this state.
The shaft 26 and the like rotate together, and this rotation is performed against the braking force of the brake member 33.

In this state, the sheet is continuously fed normally.

In this case, back tension is always applied to the sheet by the above-mentioned braking force, which is advantageous in ensuring reliable sheet feeding.

Note that when configuring this way, you need to be careful about the following:
It is an important condition that the sheet feeding force by the pair of discharge conveying rollers 13 is set larger than the above-mentioned braking force, and that this braking force is set larger than the maximum elastic force of the mainspring 23.

Of these, the above-mentioned chassis is adjusted by appropriately changing the mounting angle θ between the pin 18c and the stopper piece 31b shown in FIG. The adjustment is made by rotating the brake member 33 to change the pressing force of the brake member 33 against the mainspring case 24.

As described above, the characteristic feature of the embodiment of the prior invention is that the upper body 2
When the upper body 2 is released, the reversal prevention mechanism by the locking lever 41 works, and the rotational force in the direction of rewinding the roll sheet is accumulated by the forced pull-out operation of the sheet after loading the roll sheet, and furthermore, the upper body 2 When the seat is closed, the accumulated rotational force is released and the slack in the seat is removed.

Therefore, there is no risk that the sheet will be set with a loose sheet, and problems such as jamming can be prevented.

Furthermore, during normal use after the sheet is set, when the upper body 2 is released for purposes such as replenishing toner, abnormal tension is not momentarily applied to the sheet, and the sheet may be damaged or skewed. There is no risk of this occurring.

Furthermore, even when the upper body 2 is closed, the slack in the sheet that occurs between the discharge conveyance roller pair 13 and the roll sheet 4 can be removed in the same way as when loading the roll sheet.

Incidentally, in the above-mentioned embodiment, the mainspring 23 is used as the rotational force accumulating means in the winding direction of the roll sheet, but other means such as a coil spring that can achieve the same function may also be used. It's okay.

In addition, in FIG. 2, a pushing member 47 provided on the upper body 2 is used as a means for operating the 1 actuation lever 43,
Although the operating lever 43 is actuated by the pushing member 47 when the upper body 2 is opened or closed, the present invention is not limited thereto. and rotate the locking lever 41 to the gear 18.
The actuating lever 43 is once locked in the state in which it is engaged with the lever 43. In this state, the sheet end is gripped by the pair of conveying rollers 13, and when the upper body 2 is closed, the lever 43 is locked.
The locked state may be manually released.

In the prior invention, for the sake of convenience, a facsimile machine has been applied, but the present invention can also be applied to an electrophotographic copying machine or the like equipped with this type of paper feeding device.

The above is the content of the prior invention.

On the other hand, an example of the configuration of this invention is shown in FIG.

Members having the same functions as those in the prior invention are given the same reference numerals.

This embodiment differs greatly from the prior invention in that the shape and arrangement of the pushing member 47 in the prior invention are different, and that a braking member 101 is provided at its extended tip; and actuation lever 4
3 are integrated to form the operation locking lever 102, and a brake member 33 that presses against the outer periphery of the mainspring case 24 is provided at the tip of the brake lever 103 that swings coaxially with the operation locking lever 102. and that the diameter of the holder 14, which is a roll sheet supporting member, is increased.

The state shown in FIG. 8 is the state when the upper body 2 is opened, that is, when the roll sheet 4 is loaded, and the pushing member 47 is attached to the upper body 2 at its right end (not shown).

A locking pawl 41 provided at the tip of the operation locking lever 102
In a, the operation locking lever 102 is rotated around the shaft 38 by the spring 10.
4 gives a counterclockwise rotational habit, the teeth of the gear 18 are embedded, and the gear 18
This prevents clockwise reversal.

The brake lever 103 is given a counterclockwise rotational habit about the shaft 38 by a spring 105, so that the brake member 33 at its tip is pressed against the outer periphery of the mainspring case 24.

The tip of the pushing piece 47a of the pushing member 47 does not necessarily need to be brought into contact with the operation locking lever 102 from the beginning as shown.

When the sheet 4a is pulled out from the roll sheet 4, the gear 17
rotates in the clockwise direction, this rotational force is transmitted to the gear 18, the mainspring 23 is wound and tightened via the shaft 26, and the mainspring 23 receives a rotational force in the direction of rewinding the roll sheet 4, that is, in the counterclockwise direction. Accumulated.

After the tip of the pulled-out sheet 4a is held in the conveyor roller 13, the upper body 2 is gradually closed.

FIG. 9 illustrates the state immediately before the upper body 2 is completely closed.

When the upper body 2 is gradually closed, the pushing piece 4 of the pushing member 47
The tip of the lever 7a gradually pushes the left end surface of the actuation locking lever 102, and the actuation locking lever 102 rotates clockwise around the shaft 38, and the locking pawl 41a at the tip engages the gear 18.
deviate from

As a result, due to the restoring force of the mainspring 23, the gear 18
rotates clockwise, the rolled sheet 4 rotates counterclockwise via the gear 17, the sheet 4a that has been pulled out is rewound, and its slack is removed.

When the upper body is completely closed, as shown in Figure 10,
The braking member 101 at the tip of the pushing member 47 presses against the outer periphery of the roll sheet holder 14a and brakes it.
The stopper pin 106 of the operation locking lever 102, which has further rotated clockwise, pushes the brake lever 103, and the brake member 33 at the tip of the stopper pin 106 pushes the brake lever 103, and the brake member 33 at the tip of the stopper pin 106 pushes the brake lever 103.
4, and the mainspring 23 becomes free.

As a result, the pulled out seat 4a is attached to the mainspring 23.
The sheet is driven and conveyed by the pair of conveying rollers 13 while being kept under tension by the braking member 101 without being subjected to any force.

As described above, according to this invention, since the mainspring is free during sheet conveyance, only a small amount of sheet conveyance torque is required, and it is possible to save energy consumption and improve the durability of parts.

Portions that are not explained in detail in this invention may be considered to be the same as the previous invention.

Furthermore, the basic idea of the modified embodiments described in the prior invention can be adopted in this invention.

For example, it is not necessarily necessary to link the release of the locking pawl or the like with the opening/closing operation of the upper body, and this may be done manually.

In addition, various other modified embodiments are possible within the scope of the spirit of this invention as described in the claims for utility model registration.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of a facsimile machine that is an application example of the prior invention, Figure 2 is a side view of the prior invention device, Figure 3 is an exploded perspective view of the prior invention device, and Figure 4 shows the operation of the reverse prevention mechanism. FIG. 5 is a front sectional view of the device, FIG. 6 is a side view of the main part of the reverse rotation prevention mechanism, and FIG. 7 is a diagram showing the feeding relationship between the discharge conveyance roller pair and the sheet. FIG. 8 is a schematic side view showing an embodiment of the invention; FIGS. 9 and 10 are schematic side views showing the operating state of the device shown in FIG. 8. It is. 4... Roll sheet, 13... Pair of discharge conveyance rollers as a conveyance means, 14, 15... Roll holder and bracket as a loading means, 23
・・・・・・Spring as a means of accumulating rotational force, 101
...Roll holder braking member, 102...
...Operation locking lever as accumulation release means, 103...
...Brake lever as a means of releasing the actuation.

Claims (1)

[Claims for Utility Model Registration] 1. A loading means having a support member for supporting a rolled sheet wound into a roll; a sheet conveying means for gripping the leading end of the rolled sheet pulled out from the loading means; a rotational force accumulating means for accumulating the rotational force of the roll sheet in a direction to rewind the roll sheet when the leading end of the roll sheet is pulled out from the loading means; , an accumulation release means for opening the rotational force accumulation means and rotating the rolled sheet in a direction to unwind the sheet in order to remove slack in the sheet occurring between the sheet conveyance means and the loading means; After that, a roll sheet conveyance braking device includes a braking means for braking the roll sheet support member, and an activation release means for disabling the rotational force accumulation means. 2. The sheet conveying means is provided in the upper body,
In the recording device, the roll support member is provided in a lower body, and the upper body is configured to be openable and closable with respect to the lower body using a side portion of the device as a swinging fulcrum, when the upper body is in an open state. pulling out the leading end of the sheet from the roll sheet and holding it in the sheet conveying means;
Utility model registration claim 1, in which the accumulation release means is activated when the upper body is just before the closed state, and the braking means and the activation release means are activated when the upper body is in the closed state. Roll sheet conveyance braking device as described in section 2.