JP2011194651A - Unsealing device of envelope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unsealing device capable of preventing a flap F from being damaged and surely unsealing the flap with a simple mechanism.SOLUTION: The unsealing device 1a conveys the envelope E with the closed flap F with the flap arranged upper side and the opposite side of the flap placed at the head side. The unsealing device slightly opens the flap by bending the envelope during conveying by the pickup roll 3 and the handling roll 4 whose conveying speed is slower than that of the pickup roll, further opens the flap by the jet of the air nozzle 6, and completely opens the flap by conveying the envelope while sandwiching the same between the handling roll 4 and the handling plate 5. The problems such as defective paper feeding, damaged envelopes, and defective sealing are not generated, thereby the flap can be surely opened by the simple mechanism because the flap are unsealed in a non-contact manner.

Description

  The present invention can be provided, for example, in an envelope printing apparatus or an enclosing apparatus that encloses a printed matter in an envelope, and opens an flap to release an enclosing port while conveying the envelope with the flap closed. It is related with the opening device of.

  For example, in companies and other organizations, notices / contacts for users and members of organizations, promotional documents, invoices, and other printed materials with necessary information according to various purposes are sealed and delivered to users by mail. There is a case. For that purpose, it is necessary to print the address to the envelope and enclose the printed matter in the envelope, but the amount of work becomes enormous depending on the number of target users and the number of types of documents to be shipped, It is preferable to efficiently perform a printing operation for printing a name addressed to an envelope and a paper enclosing operation for folding a document and inserting the document into an envelope using a printing apparatus or an enclosing apparatus. When the envelope is fed in the printing device or when the envelope is fed in the sealing device, it is necessary to open the flap of the envelope.

  Patent Document 1 below proposes a mechanism for opening a flap of a transported envelope using a claw tip of an opening member as an invention applicable to such a use.

JP-A-6-166297

  According to the invention described in Patent Document 1 described above, since the tip of the claw tip of the opening member is a mechanism that directly contacts the flap, the flap of the envelope may be damaged in some cases, and the flap opens. The envelope is not caught in the opening member and the conveyance stops, the envelope itself is damaged, and the flap does not open, so the envelope cannot be put in the envelope, and the flap is sealed by gluing etc. In some cases, such as a sealing failure that cannot be performed occurs.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the envelope opening device that can reliably open the flap with a simple mechanism without causing the above-described problems by opening the flap in a non-contact manner. The purpose is to provide.

The envelope opening device described in claim 1 is:
Open and close the closed flap while transporting the envelope with the flap that is openable and closable at the enclosure's closure opening in the closed state, with the flap facing up, with the opposite side of the flap at the top. In the envelope opening device to release
A feeding means for feeding the envelope in the transport direction;
A first opening means for opening the flap to be in a first opened state by bending the main body of the envelope sent out by the feeding means;
Second opening means for opening the flaps of the envelope opened by the first opening means and further opening the flaps to make the second opening state;
A sandwiching means for completely opening the flap further opened by the second opening means to be in a third opened state by sandwiching and transporting only the uppermost envelope among the envelopes sent by the sending means,
It is characterized by having.

The envelope unsealing apparatus according to claim 2 is the envelope unsealing apparatus according to claim 1,
The first opening means is the sending means for sending an envelope at a predetermined carrying speed and the rolling means for sending the envelope at a carrying speed smaller than the carrying speed of the sending means.

The envelope unsealing apparatus according to claim 3 is the envelope unsealing apparatus according to claim 1,
The first opening means is a conveyance guide that is provided between the sending means and the rolling means and supports the main body of the envelope to be conveyed in a convex state.

The envelope opening device according to claim 4 is the envelope opening device according to any one of claims 1 to 3,
In order to detect whether or not the envelope flap is in the second unsealed state, at least 3 from the tip of the envelope flap opened at a non-perpendicular angle to the envelope transport direction and perpendicular to the transport surface A sensor for setting a detection line at a height that can be detected above one-fifth is provided between the first opening means and the second opening means.

The envelope unsealing apparatus according to claim 5 is the envelope unsealing apparatus according to claim 4,
Auxiliary opening means is provided downstream of the detection line of the sensor with respect to the envelope conveyance direction, for holding the envelope flap in the second opened state in the opening direction.

The envelope opening device according to claim 6 is the envelope opening device according to claim 5,
An opened envelope transport line provided downstream of the winding means with respect to the envelope transport direction, and a storage for receiving an unopened envelope provided near the transport line and at a position different from the transport line. And a sorting unit that is swingably provided on the transport line, and that sorts envelopes whose flaps are not determined to be in the second unsealed state by the sensor from the transport line to the storage unit.

  According to the envelope opening device described in claim 1, the envelope is sent out in the conveying direction by the sending means, and then the flap is slightly opened by bending the main body of the envelope by the first opening means, and then the second opening. By blowing air to the flaps of the envelope by means and further opening the flaps in a non-contact manner, and finally transporting the envelopes by sandwiching them with the rolling means, the flaps can be completely opened and transported to the destination. Since the flap is opened in a non-contact manner, problems such as poor paper feed, envelope breakage, and sealing failure do not occur, and the flap can be reliably opened with a simple mechanism.

  According to the envelope unsealing apparatus described in claim 2, in the effect of the envelope unsealing apparatus according to claim 1, by controlling the conveying speed of the feeding means to be larger than the conveying speed of the rolling means, The main body of the envelope sent out by the feeding means is bent and the flap is slightly opened. For this reason, the clearance gap between the flap which the 2nd opening means blows air and an enclosure port is ensured, and the non-contact-type opening by a 2nd opening means can be ensured.

  According to the envelope unsealing apparatus described in claim 3, in the effect of the envelope unsealing apparatus according to claim 1, the conveying guide provided between the feeding means and the separating means raises the envelope to be conveyed upward Since it is guided in a convex state, the main body of the envelope sent out by the feeding means is bent and the flap is slightly opened. For this reason, the clearance gap between the flap which the 2nd opening means blows air and an enclosure port is ensured, and the non-contact-type opening by a 2nd opening means can be ensured.

  According to the envelope opening device described in claim 4, in the effect of the envelope opening device according to any one of claims 1 to 3, the detection line of the sensor is connected to the first opening means and the second opening. Since the angle between the means is set to a predetermined height and an angle at which the flap surface of the envelope can be detected, it is possible to reliably detect whether or not the envelope flap is in the second opened state.

  According to the envelope opening device described in claim 4, in the effect of the envelope opening device according to claim 3, when the envelope flap is brought into the second opening state by the second opening means, the auxiliary opening is performed. Since the means presses the flap, the flap does not return to the closing direction again, and the envelope is sent to the rolling means while keeping the flap in the second opened state, and the flap is completely opened and conveyed to the destination. it can.

  According to the envelope unsealing apparatus described in claim 5, in the effect of the envelope unsealing apparatus according to claim 4, when the flap is not judged to be in the second unsealed state by the sensor, the envelope is passed. Since the flap of the envelope that has been considered is not opened in a normal state, the envelope can be distributed from the transport line and discharged to the storage unit by operating the distribution means at an appropriate timing.

It is a schematic structure diagram illustrating an embodiment of the present invention. It is a schematic structure figure explaining the modification of the 1st opening means in the embodiment of the present invention. It is a schematic structure diagram explaining a modification provided with a sensor for detecting the flap of the envelope in the embodiment of the present invention. It is a schematic structure figure of the opening apparatus of the comparative example which installed the sensor which detects the flap of an envelope on the conditions different from this embodiment. FIG. 6 is a schematic structural diagram illustrating a modified example in which auxiliary opening means for preventing the flap of the envelope from closing again in the embodiment of the present invention is provided. It is a schematic structure figure explaining the modification provided with the means which excludes from the line the envelope which the flap was not opened in the embodiment of the present invention.

  An envelope opening apparatus according to an embodiment described below is an apparatus for opening a flap while conveying an envelope supplied in a predetermined posture, for example, for opening an envelope for printing an address in an image forming apparatus. Or used to open a flap in an enclosing device that encloses printed matter in an envelope. This unsealing device may be an independent device that opens and sends out a flap, or may function as a part of an image forming device or a sealing device.

1. First Embodiment A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the opening device 1 a includes a sheet feed table 2 that can be raised and lowered. A large number of envelopes E are stacked on the paper feed tray 2 and are sequentially fed from the uppermost envelope E. Further, as indicated by a white arrow, the paper feed tray 2 is raised every time the envelope E is sent out, and the uppermost envelope E is always set at the sending position.

  As shown in FIG. 1, the envelope E stacked on the paper feed tray 2 has a structure in which a flap F that can be opened and closed is provided in an enclosure port of a rectangular main body B, and the flap F is in a closed state. . Then, the state in which the flap F is set as the upper side and the side opposite to the flap F (that is, the lower end of the main body B) is set as the normal state is loaded on the sheet feeding table 2. Since the envelope E which is not in the normal state cannot open the flap F, it will be discharged out of the line as an NG product as will be described later.

  As shown in FIG. 1, a pickup roll 3 is provided above the paper feed tray 2 as feed means for feeding the uppermost envelope E on the paper feed tray 2 set at the feed position in a predetermined transport direction. It has been. Further, on the downstream side of the pickup roll 3 in the transport direction, there are provided a separating roll 4 as a separating means and a separating plate 5 that comes into contact with the separating roll 4 from below. When the pick-up roll 3 sends out the uppermost envelope E on the paper feed tray 2, it is often the case that several envelopes E below it are sent out together with the uppermost envelope E. E is rolled between the separating roll 4 and the separating plate 5 and sequentially sent out from the uppermost envelope E toward the downstream.

  Further, since the transport speed Vp of the pick-up roll 3 is larger than the transport speed Vs of the separating roll 4 (Vs <Vp), the envelope E between the rolls 3 and 4 is bent upward as shown in FIG. As a result, the flap F is slightly opened. In the present embodiment, such an opening state of the envelopes E to F is referred to as a “first opening state”. Moreover, the pick-up roll 3 and the rolling roll 4 which have the relationship of the conveyance speed mentioned above are called a 1st opening means as a means which makes the envelope E thru | or the flap F a 1st opening state. In addition, in order to drive the pick-up roll 3 and the rolling roll 4 with the conveyance speed of the magnitude relationship as described above and at an appropriate timing, the drive motors of both the rolls 3 and 4 can be appropriately controlled by the control means. is necessary.

  As shown in FIG. 1, an air nozzle 6 is provided as a second opening means above the separating roll 4. The air nozzle 6 has an opening directed obliquely downward on the upstream side in the transport direction, and blows air to the back side of the flap F of the envelope E in the first opened state that is slightly opened between the pickup roll 3 and the separating roll 4. Be able to. The envelope E in the first opened state blown with air by the air nozzle 6 is in the second opened state in which the flap F is further opened. The second unsealed state means a state in which the flap F is unsealed to at least an angle exceeding the vertical with respect to the transport surface. The air nozzle 6 may always inject air, or may intermittently inject air at an appropriate timing when the envelope E is conveyed.

  The envelope E is conveyed while being sandwiched between the winding roll 4 and the rolling plate 5 as shown in FIG. 1 while maintaining the state where the flap F is further opened by the air from the air nozzle 6. After passing through the separating roll 4, the flap F is completely spread in the opening direction, and is in a state substantially flush with the main body B. Such a state where the flap F is completely opened is referred to as a third opened state. Moreover, the rolling roll 4 which makes the 3rd open state which opened the flap F completely by conveying across the envelope E is called a 3rd opening means.

  According to the opening device 1a of the envelope E according to the present embodiment, the envelope E sent out in the transport direction by the pickup roll 3 hits the separating roll 4 whose transport speed is slower than that of the pickup roll 3 and bends upward, and the flap F Opens a little. Therefore, air from the air nozzle 6 is blown between the flap F and the main body B to further open the flap F, and while holding the roll F at least 90 degrees and holding it with air force, The envelope E is sandwiched between the facing plate 5 and conveyed. Since the flap F is in an open state at an angle of 90 degrees or more, the flap F is sandwiched between the rolling roll 4 and the rolling plate 5 as it is, and the flap F is completely opened by being held and conveyed. That is, in the envelope E, the flap F is substantially opened 180 degrees from the state in which the initial flap F is closed.

  In this way, the flap F is opened a little by first bending the envelope E a little, then the flap F is further opened widely by non-contact means by air, and finally the envelope E is held by the roll 4 while maintaining this state. By holding and transporting, the flap F can be completely opened and sent to the other side. For this reason, problems such as paper feed failure, envelope damage, and sealing failure do not occur, and the flap F can be reliably opened and sent out with a simple mechanism.

FIG. 2 is a modification of this embodiment.
In the first embodiment, the first opening means is the pick-up roll 3 and the separating roll 4 that are in the above-described relationship with the conveyance speed. However, in the opening device 1b of this modification, as shown in FIG. The conveyance guide 7 provided between 3 and the separating roll 4 functions as a first opening means. The conveyance guide 7 is gently curved toward the downstream. For this reason, the envelope E is projected upward when being conveyed by the pick-up roll 3 and the separating roll 4, and as a result, is in a first opened state in which the flap F is slightly opened. Also by this modification, the same effect as the first embodiment can be obtained.

2. 2nd Embodiment The opening apparatus 1c which concerns on 2nd Embodiment of this invention is shown in FIG. 3, the comparative example is shown in FIG. 4, and both are demonstrated.
In FIG. 3, the air nozzle 6 shown in FIG. 1 is omitted for convenience of illustration. Moreover, about the structure similar to 1st Embodiment, the code | symbol same as the code | symbol in 1st Embodiment is attached | subjected, and description is abbreviate | omitted.
As shown in FIG. 3, in the opening device 1c, a light detection line L for detecting the flap F of the envelope E is provided between the pickup roll 3 and the separating roll 4 (or between the pickup roll 3 and an air nozzle 6 not shown). The sensor 10 is arranged so as to be set. This sensor 10 is an optical sensor 10 having a light projecting part 10a and a light receiving part 10b, and the light projecting part 10a and the light receiving part 10b are respectively provided on both sides in the width direction (direction perpendicular to the transport direction) of the envelope E to be transported. Has been placed. The detection line L, which is the optical path, is at an angle that is not orthogonal to the transport direction of the envelope E when viewed in the plan view of FIG. Specifically, as shown in FIG. 3A, the detection line L is set to be inclined about 10 degrees with respect to the transport direction. However, as shown in FIG. 3A, the sensor 10 including the light projecting unit 10a and the light receiving unit 10b is arranged opposite to the axis of the pick-up roll 3 and the axis of the separating roll 4, and the detection line L and the conveyance The direction may be set to be substantially the same. Further, the height of the detection line L is set to a height at which at least one third above the tip of the flap F of the envelope E opened in a state perpendicular to the conveyance surface can be detected. The set height of the detection line L may be on condition that the flap F located at a position higher than the radius of the roll 4 can be detected.

  According to the opening device 1c, the detection line L of the sensor 10 intersects the surface of the flap F of the envelope E between the pick-up roll 3 and the rolling roll 4, so that the detection range A by the sensor 10 is the detection line L. Instead of this line, it becomes a rectangular shape having a predetermined area with the detection line L as a diagonal line as shown by a broken line in FIG. For this reason, if the flap F is in the second opened state, the detection line L hits the surface of the flap F, and therefore the sensor 10 can detect the flap F with certainty. On the other hand, as shown in FIG. 4, when the detection line L of the sensor 10 is arranged to be orthogonal to the transport direction of the envelope E between the pickup roll 3 and the separating roll 4, the surface of the flap F of the envelope E Since the detection line L of the sensor 10 is substantially parallel to the edge, the detection line L is difficult to hit the surface of the flap F. For this reason, even if the flap F is in the second opened state, it is difficult to reliably detect this with the sensor 10.

  If the sensor 10 detects the flap F, it can be seen that the envelope E that has been conveyed is in the second unsealed state. If the envelope E is conveyed as it is with the roll 4, the flap F as described in the first embodiment. Is fully opened to the third opened state. When the sensor 10 does not detect the flap F, it means that the flap F of the envelope E that has been conveyed cannot be opened sufficiently by the air nozzle 6, so the envelope E is conveyed by the rolling roll 4 as it is. Even so, the flap F cannot be opened completely. However, according to the present embodiment, when such an unsealing error occurs, it can be detected as early as possible from the paper feeding stage, so that the output of this sensor 10 will be used as described later. In addition, it is possible to reduce the burden on the operator by simply performing the envelope removal operation for error cancellation, such as discharging the envelope E out of the line as an NG product. In addition, it is possible to take measures such as issuing an alarm using the output of the sensor 10.

  Further, in the unsealing device 1c shown in FIG. 3, a collimator 11 is provided downstream of the detection line L of the sensor 10 as auxiliary unsealing means for pressing the flap F of the envelope E in the second unsealed state in the opening direction. Yes. The collimator 11 is a wedge-shaped member that appears as a rectangle in a plan view and as a triangle in a front view, and has a wedge slope as an upper surface and a tip portion directed upstream in the transport direction. The collimators 11 are a set of two, and are arranged on both sides of the roll 4 in the axial direction. Further, the height of the bottom surface of the collimator 11 is set to a dimension that is slightly smaller than the radius of the roll 4 from the conveying surface.

  According to the collimator 11, when the envelope E which has been brought into the second opened state by the air nozzle 6 is transported while being pulled and sandwiched between the roll 4 and the roll plate 5, particularly in the axial direction of the roll 4. Since the flap F can be pressed in the opening direction on both outer sides, or the flap F can be pressed so as not to return to its original position, there is an effect that the flap F is completely opened by the rolling roll 4 without fail.

3. Third Embodiment A third embodiment of the present invention will be described with reference to FIG.
In FIG. 5A, the illustration of the air nozzle 6 shown in FIG. 1 is omitted for convenience of illustration. Moreover, about the structure similar to 1st Embodiment thru | or 2nd Embodiment, the code | symbol same as the code | symbol in both embodiment is attached | subjected, and description is abbreviate | omitted.

  As shown in FIG. 5, the opening device 1 d prevents the flap F of the envelope E from closing again at a position downstream of the detection range A of the sensor 10 and upstream of the winding roll 4. A movable roller 12 is provided as auxiliary opening means. The movable roller 12 is a set of two, and is disposed adjacent to the downstream side of the light projecting unit 10a and the light receiving unit 10b on both sides in the width direction (direction perpendicular to the transport direction) of the envelope E to be transported. ing.

  The movable roller 12 is a roller that rotates along the conveying direction of the envelope E. The movable roller 12 includes a driving unit 13 that rotates the roller and moves the roller by a desired dimension in the axial direction as necessary. The movable roller 12 is normally outside the envelope E conveyance range, but assists in opening the flap F of the envelope E that is sent, or assisting the flap F of the opened envelope E not to return. Then, it is sent out to the conveyance range of the envelope E as needed. The axial movement dimension of the auxiliary roller is set according to the size of the envelope E that is sent. In the case of the envelope E having a relatively small width, it is necessary to project a longer dimension inwardly, and in the case of the envelope E having a relatively large width, a relatively short projection is sufficient. Further, when the movable roller 12 is set within the conveyance range of the envelope E and performs opening assistance or the like, the movable roller 12 contacts the flap F and rotates in the direction of lifting the flap F.

  According to the present embodiment, when the flap F of the envelope E is opened by 90 degrees or more by the air nozzle 6, the sensor 10 detects this and activates the driving means 13, and the movable roller is moved by a necessary dimension at an appropriate timing. 12 is protruded within the conveyance range of the envelope E. Since the movable roller 12 contacts the flap F and rotates in the direction of lifting the flap F, the flap F that has been sufficiently opened is never closed again. Even if the flap F is opened once by the air nozzle 6, if the flap F is returned and closed, there is a risk that the envelope E will pass through the roll 4 while the flap F is closed, or the envelope E may be clogged with the roll 4. There is no such concern in this embodiment. Therefore, the envelope E can be sent to the roll 4 while the flap F is kept in the second opened state, and the flap F can be completely opened and conveyed to the destination.

  If the opening device 1d is configured to be compatible with a large envelope, the pickup roll 3 and the separating roll 4 are generally large, and the distance between the rollers 3 and 4 in the transport direction is also large. In the case of such a configuration, even if the flap F is sufficiently opened by the air nozzle 6, the flap F is in the original closed state because the distance or time for the envelope E to be conveyed before entering the roll 4 is long. There is a risk that it will return and cannot be completely opened. However, according to the present embodiment, if the movable roller 12 is set at a necessary position based on the detection of the flap F of the envelope E by the sensor 10, the flap F does not return between the pickup roll 3 and the roll 4. Therefore, unopened and paper jams can be prevented in advance.

  In the present embodiment, the movable roller 12 has been described as the auxiliary opening means. However, as shown by the broken line in FIG. 5, the pressing member 14 may be attached to the shaft of the roll 4 as another auxiliary means. The pressing member 14 is flexible and hangs down from the rolling roll 4 and is in contact with the conveying surface. For example, a plate material such as a resin processed into a strip shape or a chain or the like may be used. According to the pressing member 14, when the envelope E in which the flap F is in the second opened state is sent from the pickup roll 3, the flap F is pressed in the opening direction when the envelope E passes through the pressing member 14. Once the flap F is opened by the air nozzle 6, the envelope E can be fed to the roll 4 in the state as it is, and the flap F can be completely opened and conveyed to the destination.

4). 4th Embodiment The opening apparatus 1e which concerns on 4th Embodiment of this invention is demonstrated with reference to FIG.
In FIG. 6, about the structure similar to 1st Embodiment thru | or 3rd Embodiment, the code | symbol same as the code | symbol in each embodiment is attached | subjected, and description is abbreviate | omitted.

  As shown in FIG. 6, this unsealing apparatus 1c has a conveying roller 15 on the downstream side of the winding roll 4 in the conveying direction of the envelope E, and further includes a conveying line for the envelope E opened on the downstream side thereof. Yes. A storage unit 17 for receiving the unopened envelope E as an NG product is provided immediately below the transport line 16. A swingable sorting means 20 that switches the transport direction is provided between the separating roll 4 and the transport line 16. This sorting means 20 is a switching lever for switching the transport direction of the envelope E coming out of the separating roll 4, and if the sensor 10 does not determine that the flap F of the envelope E is in the second unsealed state, the sensor 10 Oscillate at an appropriate timing using the above signal to switch the conveyance direction downward, drop the envelope E of the NG product fed from the roll 4 and conveyed by the conveyance roller 15 and store it in the storage unit 17. Can do.

  When the envelope E of the NG product is received in the storage unit 17, when the signal indicating that the product is NG product is obtained from the sensor 10, the driving speed of the rolling roll 4 is increased, and the envelope E is moved faster. At the same time, the sorting unit 20 may be driven early to switch the transport direction downward, and the envelope E of the NG product may be quickly discharged from the transport line 16 and stored in the storage unit 17. If the NG product is quickly discharged in this way, the rear end portion of the NG product is caught by the sorting means 20 and the like, and there is less possibility of paper jamming, and the feeding timing of the envelope E sent next time This eliminates concerns about delays. The envelope E stored in the storage unit 17 can be taken out when an appropriate amount is accumulated, and other than worn items can be set again on the supply base 2 in a predetermined direction and can be opened again.

DESCRIPTION OF SYMBOLS 1a, 1b, 1c, 1d, 1e ... Opening device 3 ... Pick-up roll as delivery means which is 1st opening means 4 ... Separation roll as opening means which is 1st opening means and 3rd opening means 6 ... 2nd opening Air nozzle as means 7... Transport guide as first opening means 10... Sensor 10 a... Light projecting part of sensor 10 b... Light receiving part of sensor 11 ... collimator as opening assisting means 12 ... movable roller as opening assisting means 14. Holding member 16 as auxiliary means 16 ... conveying line 17 ... storage section 20 ... sorting means E ... envelope B ... envelope body F ... envelope flap L ... sensor detection line A ... sensor detection range

Claims (6)

Open and close the closed flap while transporting the envelope with the flap that is openable and closable at the enclosure's closure opening in the closed state, with the flap facing up, with the opposite side of the flap at the top. In the envelope opening device to release
A feeding means for feeding the envelope in the transport direction;
A first opening means for opening the flap to be in a first opened state by bending the main body of the envelope sent out by the feeding means;
Second opening means for opening the flap by blowing air to the flap of the envelope opened by the first opening means to make the second opened state;
A sandwiching means for completely opening the flap further opened by the second opening means to be in a third opened state by sandwiching and transporting only the uppermost envelope among the envelopes sent by the sending means,
A device for opening an envelope, comprising: The said 1st opening means is the said sending means which sends an envelope at a predetermined | prescribed conveyance speed, and the said rolling means which sends an envelope at the conveyance speed smaller than the conveyance speed of the said delivery means, The said 1st opening means Envelope opening device. The first opening means is a conveyance guide that is provided between the sending means and the rolling means and supports the main body of the envelope to be conveyed in a convex state. The envelope opening device according to the description. In order to detect whether or not the envelope flap is in the second unsealed state, at least 3 from the tip of the envelope flap opened at a non-perpendicular angle to the envelope transport direction and perpendicular to the transport surface 4. A sensor for setting a detection line at a height at which a portion above a half can be detected is provided between the first opening means and the second opening means. Opening device for envelopes described in 1. 5. The envelope according to claim 4, wherein auxiliary opening means for pressing the flap of the envelope in the second opened state in the opening direction is provided downstream of the detection line of the sensor in the conveyance direction of the envelope. Opening device. An opened envelope transport line provided downstream of the winding means with respect to the envelope transport direction, and a storage for receiving an unopened envelope provided near the transport line and at a position different from the transport line. And an allocating unit that is swingably provided in the conveyance line and distributes an envelope from which the flap is not determined to be in the second unsealed state by the sensor from the conveyance line to the storage unit. Item 6. The envelope unsealing apparatus according to Item 5.

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