JP2511828B2 - Sheet material feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is applied to an image forming apparatus such as a laser beam printer, a copying machine, a word processor, a facsimile, etc., and a sheet material receiving portion of an apparatus for supplying and using a sheet material. The present invention relates to a sheet material feeding device that feeds a sheet material.

In the above description, the sheet material receiving unit is an image forming unit of various types in the image forming apparatus, for example, a transfer type or direct type electrophotographic copying mechanism / electrostatic recording (printing) mechanism / magnetic recording mechanism, thermal recording mechanism, impact. It is an image forming means section of various conventionally known image forming principles and methods such as a printing mechanism such as a mold or a non-impact type printing mechanism.

The sheet material is transfer paper, photosensitive paper, electrostatic recording paper, magnetic recording paper, printing paper, printing paper, or the like.

More specifically, the present invention is to set a long rolled sheet (or folded sheet) as a sheet material in a storage unit, and press the free end portion side of the long sheet material into a pressure contact conveying means (generally in general). It is sandwiched by a press contact rotation transfer roller pair) and is intermittently successively fed out and conveyed, and the sheet material portion fed out by the pressure contact conveyance means is disposed by a cutter means arranged downstream of the pressure contact conveyance means in the sheet material conveyance direction. A sheet material feeding device of a type in which the sheet material is cut as a cut sheet material of a required length, and the cut sheet material is continuously fed to the sheet material receiving portion, and the sheet material is sequentially fed to the sheet material receiving portion. Regarding

(Prior Art) As described above, a sheet material feeding device itself of a system in which a long sheet material is sequentially fed out, cut and fed is known, and a cut sheet material (sheet (Sheet paper) is stacked and set in the storage unit, and the sheet material feeder is of a system that sequentially separates and feeds the stacked sheet materials, and an automatic sheet material sequential feeder that is provided in the image forming apparatus or the like. Is widely used as.

(Problems to be Solved by the Invention) In the conventional sheet material feeding device of this type, the sheet material portion on the upstream side of the sheet material feeding direction in the sheet material feeding direction with respect to the cutter means is in pressure contact with the sheet feeding means even when the sheet material is not fed. It is in a state of being sandwiched between the opposed pressing members with a predetermined relatively large clamping force. Hereinafter, this pressure contact conveyance means will be referred to as a general conveyance roller pair.

However, when the sheet material is not fed for a long time, or when the environmental humidity is high even for a relatively short time, the sheet sandwiched between the nip portions of the pair of transport rollers in the rotation stopped state. Wrinkled wrinkles S _b are likely to occur on both sides of the material portion S _a (FIG. 7A) due to the expansion of the sheet material S ₁ due to moisture absorption. Furthermore, depending on the case, the code S _{c in} FIG. 7 (b)
As described above, a vertical band-like wrinkled portion is likely to be formed in the sheet material stretched portion between the pair of conveying rollers 13 (a, b) and the roll winding portion of the sheet material S ₁ . The corrugated wrinkles S _b and S _c of the sheet material S ₁ generated as described above are not naturally resolved or disappeared even when the sheet material is fed next time, and are substantially fed to the sheet material receiving portion as they are. To be done. Therefore, when the sheet material receiving portion is, for example, the image transfer portion of the image forming apparatus, the wrinkled portion
Image transfer omission occurs in S _b and S _c .

As one of the countermeasures, a heater is provided near the roll-wound sheet material S ₁ to warm the inside of the machine to lower the relative humidity, thereby suppressing the hygroscopic growth of the sheet material S ₁ to suppress the wrinkle portion S _b as described above. - Although there is to prevent the occurrence of S _c, it is there is no immediate need to always on the heater, and increase in cost of the apparatus.

According to the present invention, by the more rational means configuration, even when the standby state of the sheet material non-feeding is long or the environmental humidity is high, the sheet material S ₁ has the above-mentioned wrinkled portions S _b and S _c. The purpose is to provide a product that does not generate.

(Means for Solving Problems) The present invention relates to a pressure contact conveying means for conveying a long sheet material such as a roll winding by sandwiching its free end side and intermittently sequentially feeding out the sheet material. Also disposed downstream in the sheet material conveying direction, the cutter means for cutting the sheet material portion fed out by the pressure contact conveying means as a cut sheet material of a required length, and the cut sheet material cut by the cutter means. A means for continuously conveying the material to the material receiving section, and after the sheet material is fed out and cut based on one sheet material feeding start signal, until the next sheet material feeding start signal is input to the control system. When a predetermined timer time elapses, the sheet material holding pressure of the pressure contact conveying means is released or reduced, and when the next sheet material feeding start signal is input, the pressure contact conveying means is moved to the predetermined sheet material. Clamping pressure condition A pinching pressure varying means for returning, and at least when the pinching pressure varying means releases or reduces the sheet material pinching pressure of the press contacting and conveying means, the sheet material in the conveyance stopped state is interposed between the press contacting and conveying means and the cutter means. A sheet material holding means for holding a portion thereof lightly and holding the sheet material immovably against the own weight and back tension of the sheet material in the position state before the clamping pressure is released or reduced. It is a sending device.

(Operation) Since the pressure contact conveying means is held in a state where the sheet material holding pressure is released or reduced during standby of sheet material non-feeding, the sheet material is strongly pressed by the pressure contact conveying means as in the case of the conventional device described above. The phenomenon of generation of wrinkles on the sheet material due to waiting in the sandwiched state cannot occur.

In this case, even if the holding pressure of the pressure contact conveyance means is released or reduced and the sheet material holding force by the pressure contact conveyance means disappears or decreases, the sheet material holding means is brought into light contact with the sheet material holding means, and the pressure contact conveyance means operates. Since the sheet material is held immovably against the dead weight and back tension of the sheet material before the clamping pressure is released or reduced, the leading edge position of the sheet material at the start of sheet material feeding in each sheet material transport cycle is constant. Therefore, there is no variation in the sheet material conveying length in each sheet material feeding cycle.

Further, since the sheet material holding means needs only a light contact pressure to prevent the movement of the sheet material against the self-weight and back tension of the sheet material, the phenomenon of generation of wrinkles on the sheet material by the sheet material holding means is actually It does not occur.

(Embodiment) FIG. 5 is a schematic configuration diagram of an example of an image forming apparatus provided with a sheet material feeding device of an embodiment according to the present invention.

The image forming apparatus of this example is a laser beam printer (LBP) using a transfer type electrophotographic mechanism.

(1) Schematic configuration of LBP 1 is a drum-type electrophotographic photosensitive member (hereinafter referred to as a drum) which is rotationally driven around a support shaft 1a in a clockwise direction indicated by an arrow at a predetermined peripheral speed.

The drum 1 receives uniform positive or negative charge on its peripheral surface by a corona charger 2 during its rotation process, and then its charged surface is exposed to a laser beam scanning exposure corresponding to target image information by a laser beam scanner 3. Receive L. As a result, electrostatic latent images are sequentially formed on the drum peripheral surface as image information.

The latent image is sequentially visualized as a toner image by the developing device 4, and the toner image is fed at a position of the transfer discharging device 5 to the space between the discharging device 5 and the drum 1 (transfer portion) described later. The sheets are sequentially transferred to the sheet material (transfer sheet) fed from the apparatus.

The sheet material that has passed the transfer portion and has undergone the toner image transfer is separated from the surface of the drum 1 by the separating discharge device 6, is introduced into the toner image fixing device 8 by the conveying device 7, and is fixed with the toner image,
The pair of discharge rollers 9 discharges the image as an image formed product onto a discharge tray 10 outside the apparatus.

After the transfer of the toner image, the surface of the drum 1 is cleaned by the cleaning device 11 to remove residual toner and other adhered contaminants, and is repeatedly used for image formation.

The laser scanner 3 receives a time-series electric digital pixel signal of target image information from a host device (not shown) such as a computer, a word processor, and an image reading device, and outputs a laser beam L modulated in accordance with the input signal. By scanning this laser beam with the generatrix direction of the drum 1 as the main scanning direction, the surface of the drum 1 is scanned and exposed. The above-mentioned host device and LBP device are linked by a control system on both sides electrically communicating with each other to exchange signals.

(2) Sheet material feeding device This example is provided with a sheet material automatic feeding means section of the sequential feeding / cutting feeding method of roll-wound sheet material according to the present invention and a sheet material manual feeding means section. There is.

a) The sheet material automatic feeding means S ₁ is a sheet material for transfer of a long roll and is rotatably mounted on a support shaft O provided on the bottom plate side of the apparatus. 12
Numerals 20 to 20 are sequentially set on the upward path connecting the mounting portion of the roll-wound sheet material S ₁ to the transfer portion between the drum 1 above the apparatus and the transfer discharger 5 as a sheet material conveying path. A guide plate (12), a first conveying roller pair (13) as a sheet material pressure contact conveying member, and a sheet material holding member (1) arranged in an array.
4), rotary cutter (15), guide plate (16), second conveying roller pair (17), guide plate (18), registration roller pair (19), guide plate (20).

To set the roll-wound sheet material S ₁ , open the inside of the apparatus by opening the front door 30 of the apparatus, mount the roll-wound sheet material S ₁ on the support shaft O, and rewind the tip side of the sheet material S ₁ a little. Along the outer surface of the guide plate 12, the front end of the sheet material is abutted against the nip portion of the first conveying roller pair 13 from below, and the first conveying roller pair 13 is moved in the sheet material feeding direction by the driving knob 13e (first shown). By rotating and scanning, the leading edge of the sheet material is passed through the nip portion and sent out to the upper side of the nip portion, and then the driving knob is rotated to pass the leading edge portion of the sheet material between the facing members 14a and 14b of the sheet material holding member 14. Further, the initial setting is performed by passing the gap between the fixed blade 15a and the movable blade 15b of the rotary cutter 15 and allowing the leading end of the sheet material to enter the cutter 15.

In the case of the device of this example, when the reset button (not shown) of the control circuit system is pressed next and the front door 30 of the device is closed, the door switch (not shown) is closed and the rotary cutter 15
Is operated once to cut the leading edge of the sheet material that has entered the cutter 15. Then, based on the cutting completion signal, the first conveying roller pair 13 rotates by a predetermined constant rotation angle and stops again. Due to the rotation of the roller pair at a constant rotation angle, the front end portion of the sheet material after cutting enters into the cutter 15 by a predetermined length and enters a standby state. The cutting process of the leading end portion of the sheet material at the time of the initial setting is performed to remove the irregular edge of the leading end of the rolled sheet material. Unnecessary leading end strips of the cut rolled sheet material are removed from the inside of the cutter as the cutter 15 operates.

As shown in the cross sectional view of FIG. 2, the facing members 14a and 14b of the sheet material pressing member 14 of the apparatus of this example are short fibers (monofilaments) 14 each having an appropriate elastic rigidity on the inner surface side.
The c is provided in a fluffy manner by inclining in the forward direction of the sheet material conveyance direction (for example, the surface of the product name etiquette brush (dust removal brush)), and is substantially used when the sheet material is conveyed. Does not cause the conveyance resistance (friction resistance is small) and allows smooth conveyance of the sheet material, but a non-return action (large friction resistance) against movement of the sheet material in the direction opposite to the sheet material conveyance direction. ) To prevent the sheet material from slipping back.

In the case of the apparatus of this example, the first conveying roller pair 13 as the sheet material pressure contact conveying means has a predetermined timer time after the door switch is closed and the print start signal is not input to the control circuit, and then again. After the print operation is executed and the next print start signal is not input to the control circuit after the end of the print operation, the sheet material pinching pressure is automatically released or the pressure is automatically released. The mechanical structure is configured to reduce the sheet material, and prevents the sheet material from being pinched and wrinkled due to the sheet material being sandwiched between the roller pair 13 and the conveyance being stopped. The structure of this mechanism will be described in detail in item b) below.

Note that even if the sandwiching pressure of the sheet material S ₁ by the roller pair 13 is released or reduced, the sheet material S ₁ is reversely stopped by the sheet material pressing member 14 to prevent the sheet from slipping back, and the leading end portion is placed inside the cutter 15. It is stably held in a state where it has entered by a predetermined length α. Depending on the sheet material holding member 14, no pinching marks or wrinkles are generated on the sheet material S ₁ .

When the sheet material feeding start signal based on the print start signal is transmitted, the first transport roller pair 13 is returned to a predetermined sheet material sandwiching pressure state when the sheet material sandwiching pressure is released or reduced, and the sheet material transporting is performed. Driven to rotate. The second conveying roller pair 17 is also driven to rotate in the sheet material conveying direction.

By the rotation of the first conveying roller pair 13, the roll-wound sheet material S ₁
Is pulled and fed out, and its tip reaches the registration roller pair 19 from inside the cutter 15 between the guide 16 and the nib portion of the second conveying roller pair 17, through the guide plate 18.

At this point, the registration roller pair 19 is held in a rotation-stopped state, and the leading edge side of the conveying sheet material S ₁ has the roller pair 19
It hits against the nip part of the sheet and is received, and after that, the sheet material continues to be conveyed, so that the registration roller pair 19
A flexible loop portion is formed in the sheet material portion between the second conveying roller 17 and the second conveying roller 17. Due to the flexural elastic reaction force of the forming loop portion, the entire length of the leading edge of the sheet material S ₁ becomes a pair of registration rollers.
The sheet material S ₁ is pressed in parallel with the longitudinal length of the nip portion 19 and thereby the skew of the sheet material S ₁ is removed.

Reference numeral 40 denotes a sheet material front end / rear end detection sensor provided near the sheet material entrance side of the second conveying roller pair 17. When the actuator 40a of the sensor is kicked by the leading end of the conveyed sheet material S ₁ , the arrival of the leading edge of the sheet material is detected, and the trailing edge of the sheet material is detected by the return of the actuator 40a when the trailing edge of the sheet material passes. . The rotation driving of the registration roller pair 19 in the sheet material conveyance direction is started at a predetermined peripheral speed from the time when a predetermined timer time has elapsed after the leading edge of the sheet material is detected by the sensor 40. During this timer time, the leading edge of the sheet material reaches the nip portion of the registration roller pair 19 and the above loop portion is sufficiently formed.
By the rotational driving of the registration roller pair 19, the sheet material S ₁ is synchronously fed to the transfer portion between the drum 1 and the transfer discharger 5 through the guide plate 20 to sequentially receive the transfer of the toner image.

On the other hand, when the sheet material S ₁ is conveyed by a predetermined length, the rotation drive of the first conveying roller pair 13 is stopped and at the same time the rotary cutter 15 operates only once and the succeeding sheet as a cut sheet material. It is cut with the wood part. When a predetermined timer time elapses after the rear end of the sheet material cut as the cut sheet material is detected by the sensor 40, the rotation drive of the registration roller pair 19 and the second conveyance roller pair 17 is stopped.
Further, the first conveying roller pair 13 is rotated by a predetermined constant rotation angle and stopped again in response to the cutting completion signal of the sheet material by the rotary cutter 15. From the rotation of the roller pair at a constant rotation angle, the leading end portion of the succeeding sheet material after cutting enters the cutter 15 by a predetermined length α and enters a standby state. Therefore, the feeding start position of the leading end of the fed sheet material in each sheet material feeding cycle is made constant.

Thus, each time the sheet material feeding start signal is transmitted based on the print start signal, the roll-wound sheet material as described above is sent.
The sheet feeding / cutting cycle of S ₁ is executed to automatically feed the sheet material to the image forming unit.

b) Pressure contact releasing means of the first conveying roller pair 13 In FIG. 1, 13c and 13d are provided so as to face the shaft of the fixed roller 13a of the first conveying roller 13 and the shaft of the movable roller 13b, respectively. It is a circular gemini. The fixed side roller 13a and the movable side roller 13b are always biased by a pulling spring member (not shown) with a predetermined pressure contact force. Reference numeral 64 is a wedge member for the space between the two circular collar seats 13c and 13d, and the base of the wedge member 64 is swingably supported by a pin 63 on the tip end side of a lever 62 provided integrally with the shaft 61 of the rotary solenoid 60. I am doing it.

The rotary solenoid 60 is energized by the sheet material S ₁
Is not energized in the process of feeding out and cutting, the wedge member 64 is retracted from between the collar seats 13c and 13d, and a predetermined mutual pressure contact force is maintained between the roller pairs 13a and 13b. To be done.

When a predetermined timer time elapses before the next sheet material feeding start signal is input to the control system after the sheet material is fed and conveyed / cut based on one sheet material feeding start signal Power to the rotary solenoid 60 is turned on. As a result, the tip of the wedge member 64 is placed between the collar seats 13c and 13d, the rollers 13a and 13b are opened against each other against the mutual biasing spring member, and the mutual pressure contact force, that is, the sheet material clamping pressure is released. The state or the reduced state (retract state) is maintained.

Therefore, as described above, the generation of the wrinkles on the sheet material due to the sheet material S ₁ waiting while being strongly sandwiched between the rollers 13a and 13b is prevented. Roller 13a
.Sheet material S with pinching force released or reduced by 13b
_{Since 1} is continuously and stably held by the sheet material holding member 14, the sheet material S ₁ does not fall out.

When the next sheet material feeding start signal is input, the energization of the rotary solenoid 60 is accordingly turned off, and the wedge member 64 is pulled out from between the collar seats 13c and 13d and retracted to cause the roller 13a.・ 13b returns to the original mutual pressure contact state.

In the apparatus of this example, when the front door 30 of the apparatus is opened for mounting the roll-wound sheet material S ₁ or the like, the retracted state of the rollers 13a and 13b is released in conjunction with that.

FIG. 3 shows one member 14a of the sheet material holding member 14.
Shows a structure in which the elastic member 14d is constantly pressed against the other member 14b with an appropriate pressing force. FIG. 4 shows that the sheet material holding member 14 is composed of two polyester sheet materials (commercial name Mylar), which are relatively elastic, butted together in a palm shape.

The sheet material holding member 14 (a, b) is always held in a non-contact position with the sheet material S ₁ , and the first conveying roller pair 13 (a, b)
When b) is switched to the retracted state, it may be a movable type that holds the sheet material in contact with the sheet material S ₁ at the same time.

c) Manual feeding means In FIG. 5, 21 is a manual feeding port for the sheet material opened on the LBP front wall, and 22 can be laid down substantially horizontally to the outside of the LBP front wall about the lower hinge shaft 22a. . This is a manual feed port opening / closing cover plate that doubles as a guide plate on which a manual feed sheet is placed. Raise the lid plate 22 as shown by the chain double-dashed line and rotate it to LB
P By closing the front wall, the manual feed port 21 is closed. When feeding by hand, pull it down as shown by the solid line to open it.

Reference numeral 23 is a guide plate for guiding the sheet material S ₂ inserted and supplied from the manual feed port 21 to the nip portion of the second conveying roller pair 17, 24
Is a shutter member disposed in the middle of the sheet material path from the manual feed port 21 to the second conveying roller pair 17 for blocking and opening the path. The shutter member 24 of this embodiment is mounted and supported on a rotary shaft 25 which is rotated by a rotary solenoid 60 (Fig. 6). When the solenoid 26 is de-energized, as shown by the solid line in Fig. 5. Due to its own weight, the seat material path is blocked due to the downward rotation angle posture. When the solenoid is energized, as long as the solenoid is energized, the sheet material path is released by being held in the rotational angle posture that escapes to the outside of the sheet material path as shown by the dashed line in FIG.

Reference numeral 27 denotes a steel ball that is provided with downward recesses in two left and right portions of the lower surface of the upper guide plate in the sheet path from the manual sheet feed port 21 to the shutter member 24, and is freely rotatably fitted into the downward recesses. The lower surface of the steel ball is in contact with the upper surface of the lower guide plate. When the sheet material S ₂ is inserted into the sheet material path from the manual feed port 21, the sheet material S ₂ enters the sheet material path through between the upper surface of the lower guide plate and the steel ball 27.
The entered sheet material S ₂ is appropriately pressed by the lower guide plate by the weight of the steel ball 27, and even if the user releases the sheet material S ₂ after that, the sheet material S ₂ is retained and kept inserted into the manual feed port 21. It is prevented that they fall off and fall from the plate 22. This retaining means is effective in preventing the manual feed sheet material S ₂ from dropping when it is a large size sheet such as A1 size.

In FIG. 6, 51 is a control circuit system on the side of a host device such as a computer word processor, 52 is a control circuit system on the side of LBP, and the quantity control circuits and the like are connected to each other.
In the case of the apparatus of this example, reference numeral 53 is a selection button provided in the control circuit system on the host apparatus side as a sheet material manual feeding mode selection designating means. It may be provided on the LBP side.

When the button 53 is not pressed, that is, when the manual sheet material feeding mode is not selected, the power supply to the rotary solenoid 26 is kept off, and therefore the sheet material path for manual sheet feeding is blocked by the shutter member 24. Is held in a state.
In this state, even if the sheet material S ₂ is carelessly inserted and supplied from the manual feed port 21, the leading end thereof is not received by the shutter member 24 and does not reach the second conveying roller pair 17, and the sheet material automatic feeding means side It is possible to prevent problems and troubles caused by merging with the feeding sheet material S ₁ .

When the sheet material manual feeding mode is selected by the mode selection button 53, the energization of the rotary solenoid 26 is turned on, so that the shutter member 24 is moved from the manual feeding path to the retracted rotation position to move the path. Are held in the released state. At the same time, the manual mode selection indicator (lamp etc.) 54
Is displayed to that effect. As a result, the manual feed mode becomes the priority state.

Therefore, the sheet material S ₂ is fed from the manual feed port 21 and
When it is fully inserted until it hits the nip portion of the conveying roller pair 17, the tip of the conveying roller pair 17 is detected by the sensor 40, and the second conveying roller pair 17 is rotationally driven in the sheet material conveying direction based on the detection signal and is inserted. The sheet material S ₂ is drawn into the apparatus and conveyed. After that, similarly to the case of the above-described sheet material automatic feeding means, the leading end of the conveyed sheet material S ₂ is once received by the nip portion of the registration roller pair 19 in the rotation stopped state,
A loop of the sheet material is formed between the roller pair 19 and the second conveying roller pair 17, and when a predetermined timer time elapses from the time when the sensor 40 detects the leading edge of the sheet material, the registration roller pair
The rotation drive of 19 is started, and the sheet material S ₂ is synchronously fed to the image forming section (transfer section). And the sheet material S ₂
After a lapse of a predetermined timer time after the trailing edge is detected by the sensor 40, the rotational drive of the registration roller pair 19 and the second conveyance roller pair 17 is stopped, and the standby state is set until the next sheet material is manually fed. .

By pressing the mode selection button 53 again, the selection designation of the sheet material manual feed mode is canceled and the display on the display 54 is also canceled.

(Effects of the Invention) As described above, according to the present invention, a device of a system in which a long sheet material such as a roll is sequentially fed out by a pressure contact conveying means, cut by a cutter means and fed to a sheet material receiving portion. In the above, even if the sheet material is not fed for a long time or the environmental humidity is high, it is possible to strictly prevent the generation of the wrinkle portion due to the sheet material being strongly sandwiched by the pressure contact conveying means. The intended purpose is often achieved.

[Brief description of drawings]

The drawings show a sheet material feeding device according to one embodiment.
The figure is a perspective view of a main part, FIG. 2 is an enlarged cross-sectional view of a sheet member holding member, FIGS. 3 and 4 are perspective views or side views of other examples of the member, and FIG. 5 is the sheet member. Fig. 6 is a schematic configuration diagram of an example (LBP) of an image forming apparatus incorporating a feeding device, Fig. 6 is a block diagram of a control system of a manual sheet feeding means, and Fig. 7 (a).
(B) is a perspective view showing a wrinkle portion generated in the sheet material. 1 is a rotating drum type electrophotographic photoreceptor, 5 is a transfer discharger, S ₁ is a roll-wound sheet material, 13 and 17 are first and second sheet material conveying roller pairs, 14 is a sheet material holding member, 15 is a rotary cutter, 21 is a manual sheet material feeding port, and S ₂ is a manual sheet material.

Claims (1)

(57) [Claims] 1. A pressure contact conveying means for conveying a long sheet material such as a roll wound by holding its free end side in an intermittently sequential manner, and arranging it on the downstream side of the pressure contact conveying means in the sheet material conveying direction. Cutter means that is provided and cuts the sheet material portion fed out by the pressure contact conveying means as a cut sheet material of a required length, and means for continuously conveying the cut sheet material cut by the cutter means to the sheet material receiving portion. When a predetermined timer time elapses before the next sheet material feeding start signal is input to the control system after the sheet material is fed and conveyed / cut based on one sheet material feeding start signal The holding pressure variable which operates to release or reduce the sheet material holding pressure of the pressure contact conveying means and returns the pressure contact conveying means to a predetermined sheet material holding pressure state when the next sheet material feeding start signal is input. Means and At least when the sheet nipping pressure of said pressure transfer means is released or reduced by 該挟 lifting pressure varying means,
The pressure contact conveyance means and the cutter means intervene to lightly contact the sheet material portion in the conveyance stopped state to hold the sheet material in the position state before releasing or reducing the clamping pressure against the self weight of the sheet material and the back tension. A sheet material feeding device, comprising: