JP2013216463A - Paper folding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper folding device capable of folding with high accuracy in response to a number of paper folding times, a number of paper sheets and a paper sheet thickness without requiring a complex mechanism.SOLUTION: An enclosure folding section 2, generates a deflection at a desired position by folding rollers and folds a paper sheet by pinching the deflection, by the four folding rollers A, B, C, D driven by a motor, guides G1, G2, and movable abutment members S1, S2. A control section sets a rotation speed of the motor lower as a number of folding times to the paper sheet is larger, and the control section decreases the rotation speed continuously till reaching the last folding. Furthermore, as the number of paper sheets to be overlapped and folded is larger and the thickness of the paper sheet is larger, the control section decreases the rotation speed of the motor. As the rotation speed of the motor decreases, a time period during which the paper sheet passes through the folding rollers is longer, and the folding accuracy is higher.

Description

  The present invention relates to a sheet folding device that folds a sheet by conveying the sheet between at least a pair of folding rollers, and has high accuracy according to the number of sheets folded, the number of sheets, and the sheet type without using a complicated mechanism. The present invention relates to a paper folding device that can fold paper.

  Patent Document 1 below discloses an invention of a sheet folding device that forms a fold by sandwiching a sheet with a pair of rollers. This paper folding device is provided with a stop member whose position can be adjusted in the conveyance path, and the leading edge of the conveyed paper abuts against this to stop the paper, thereby bending the paper. An apparatus for forming a fold. According to the present invention, the motor for driving the roller pair is driven at the rated current voltage, and the rotational speed of the folding roller is reduced by the speed reduction mechanism at the timing when the paper is sandwiched between the roller pair, thereby increasing the torque. It is supposed that a stable crease line can be given to the paper.

JP 2002-284442 A

  According to the invention described in Patent Document 1, the motor is driven with a constant current voltage when the paper is sandwiched, and the torque is increased by switching the number of rotations of the roller with the speed reduction mechanism and the clutch. Since complicated mechanisms such as mechanisms and clutches are required, there is a problem that manufacturing costs and maintenance costs are high, and appropriate folding work conditions corresponding to changes in the number of paper sheets and paper thickness Cannot be set, and folding with high accuracy could not be performed.

  Therefore, the present invention has been made in view of the above-described problems, and does not require a complicated mechanism such as a speed reduction mechanism or a clutch. Of course, the number of sheets is changed, the number of sheets is changed, and the thickness of the sheet is changed. It is an object of the present invention to provide a sheet folding apparatus that can set an appropriate folding work condition in accordance with the above and can realize folding with high accuracy.

The sheet folding device according to claim 1 is provided.
In a paper folding apparatus that folds a paper by sandwiching the paper with at least a pair of folding rollers driven by a motor,
The number of rotations of the motor when folding the sheet is set to be lower as the number of folding is increased, and the rotation speed of the motor is set to a lower rotation speed until the sheet reaches the last folding roller. It is characterized by including a control unit that performs control for continuous reduction.

The paper folding device according to claim 2 is the paper folding device according to claim 1,
The control unit further performs at least one of control for reducing the rotational speed of the motor as the number of sheets to be folded and folded increases and control for reducing the rotational speed of the motor as the thickness of the paper increases. It is characterized by.

  According to the paper folding device of the first aspect, the control unit sets the rotation speed of the motor that drives the folding roller to be lower when the paper is folded, and the last paper is the last time the paper is folded. Since the rotation speed of the motor is continuously reduced to a low rotation speed before reaching the folding roller, it is possible to lengthen the time that the sheet is sandwiched between the folding rollers when the sheet passes through the folding roller. Since the rotational speed is gradually reduced, the external force applied to the paper from the folding roller is reduced. As the number of folds increases, the two pieces sandwiching the crease are less likely to overlap each other and the folds are more likely to occur, and the crease tends to be rounded and less likely to be sharp and sharp edges. . However, according to the present invention, as the number of folding is increased, the time for folding the sheet becomes longer. Therefore, regardless of the number of folding, the occurrence of folding deviation is small, the fold is sharpened, and high folding accuracy is achieved. be able to. Further, since the external force applied to the paper from the folding roller is reduced, the paper is hardly damaged.

  According to the paper folding device described in claim 2, the control unit not only reduces the rotation speed of the motor in response to the increase in the number of times of folding the paper, but the more the number of papers to be folded, Alternatively, the rotation speed of the motor is reduced as the thickness of the folded paper increases or according to both the number of sheets and the paper thickness. Therefore, appropriate folding conditions can be set in response to changes in the number of sheets as well as the number of sheets and the thickness of the sheets, and high-precision folding can be performed for various types of folding sheets or groups of sheets. Can be realized.

1 is a structural diagram schematically showing an overall configuration of a sheet folding device according to an embodiment of the present invention. It is a figure which shows the specific structure of the enclosure folding part in the paper folding apparatus shown in FIG. 1, and the process of folding a paper in half. FIG. 2 is a diagram illustrating a specific configuration of an inclusion folding unit in the sheet folding apparatus illustrated in FIG. 1 and a process for folding a sheet in three. FIG. 2 is a diagram illustrating a specific configuration of an inclusion folding unit in the sheet folding apparatus illustrated in FIG. 1 and a process of folding a sheet in four. It is a figure which shows the control aspect of the motor in the paper folding apparatus of this embodiment, Comprising: The relationship between each part which a paper passes in an enclosure folding part, and the folding roller speed in each said part is how to fold a paper (number of folding) It is a figure shown for every. FIG. 6 is a table showing data in a table format used when the control unit controls the motor of the folding roller in the sheet folding device of the present embodiment, and is a table showing the correspondence between the folding method of the enclosure and the speed of the folding roller. is there. FIG. 6 is a diagram showing table format data used when the control unit controls the motor of the folding roller in the paper folding device of the present embodiment, and shows the correspondence between the number of inclusions and the correction value of the speed of the folding roller. FIG. FIG. 5 is a table showing table format data used when the control unit controls the motor of the folding roller in the paper folding apparatus of the present embodiment, and includes paper information (thickness) of inclusions and a correction value for the speed of the folding roller. It is a table | surface figure which shows the corresponding relationship. FIG. 5 is a diagram illustrating table format data used when the control unit controls the motor of the folding roller in the sheet folding device of the present embodiment, and is a folding roller obtained as a result of correcting the speed of the folding roller depending on how the enclosure is folded It is a table | surface figure which shows the correspondence of this speed and speed ratio.

  With reference to FIG. 1 thru | or FIG. 8, the enclosure sealing device 1 of this embodiment is demonstrated. The encapsulating and sealing apparatus 1 of the present embodiment is folded by a desired folding method by conveying the sheet P, which is an encapsulated material, sandwiched between a plurality of folding rollers A to D, sealed in an envelope, and completed. The apparatus is capable of being discharged out of the apparatus as a sealed letter, and is particularly characterized by the inclusion folding section 2 as a paper folding apparatus for folding the paper P and its control method.

1. Structure of the sealing device 1 (FIGS. 1 to 4)
As shown in FIG. 1, the encapsulating / sealing device 1 includes an encapsulated material folding unit 2 that receives an encapsulated material fed from a printing device or the like (not shown) in the previous stage.
As shown in FIGS. 2 to 4, the enclosure folding unit 2 is provided between the four folding rollers A, B, C, and D and the conveying rollers A, B, C, and D as a folding means for the paper P. Have three guides G1, G2 and G3 which are paper transport paths. These folding rollers A, B, C, and D have rotation axes parallel to each other, and are provided in the same plane at intervals and arrangement suitable for transporting the paper P as will be described later. That is, a folding roller A is provided on one side of the upstream side relative to the conveyance direction of the paper P along the first guide G1 to which the paper P is supplied from the preceding printing apparatus. A folding roller B is provided on the other side slightly downstream of the roller A so that a part thereof protrudes from the conveying surface of the first guide G1. A folding roller C is provided on the downstream side of the folding rollers A and B along the conveyance path of the paper P at substantially the same interval as the folding rollers A and B. A folding roller D is disposed on the side of the folding roller B so as to face the folding roller C. A second guide G2 is provided between the folding roller A and the folding roller C, and the paper P can be introduced or led out between the folding roller A and the second guide G2. Further, a third guide G3 is continuously provided between the folding roller B and the folding roller D and between the folding roller C and the folding roller D, and the sheet is provided between the folding roller B and the third guide G3. P is introduced or led out, and the paper P can be conveyed downstream along the third guide G3 by the folding rollers C and D.

  The paper P is folded by the four folding rollers A, B, C, and D, the first to third guides G1 to G3, and an abutting member to be described later. There are three portions where the folding action is applied, and the folding positions are referred to as folding portions a, b, and c, respectively, by adopting the small letter of the sign of each folding roller close to each position for convenience.

  2 to 4, among the four folding rollers A, B, C, and D, the folding roller D is interlocked and connected to the motor M, and the folding roller D is further connected by an interlocking mechanism (not shown). The three folding rollers A, B, and C are interlocked and connected. The motor is controlled by the control unit 3 (MPU), and in the folding process of the paper P, the single folding motor A is driven by the control of the control unit 3 so that the four folding rollers A and B are driven. , C, D are always rotating at the same rotational speed. However, the rotational directions are not the same, and the folding rollers A and B rotate in opposite directions, and the folding rollers C and D rotate in opposite directions. The rotation directions of the folding rollers A and C are the same. According to the folding rollers A and B that rotate in opposite directions, the paper P can be conveyed forward along the second guide G2. Further, according to the folding rollers B and C rotating in opposite directions, the paper P can be fed between the folding rollers B and D along the third guide G3. Furthermore, according to the folding rollers C and D that rotate in opposite directions, the paper P can be conveyed downstream along the third guide G3.

  As shown in FIG. 1, inclusion information necessary for controlling the enclosure sealing device 1, for example, information on the number of enclosed sheets P, the type of sheets P, how to fold, and the like is input to the control unit 3 from the outside. Regardless of the input method, the operator may input from an operation panel (not shown) or may be supplied from the control unit 3 of the preceding printing apparatus. As shown in FIG. 1, the sealed sealing device 1 has an independent control unit 3, but the control unit of the preceding printing device may also serve as the control unit 3 of the sealed sealing device 1.

  As shown in FIGS. 2 to 4, the drive shaft of the motor M that drives the four folding rollers A, B, C, and D is provided with a rotary encoder 4 (hereinafter simply referred to as an encoder 4) as a rotational speed detection means. .) Is provided. The encoder 4 is connected to the drive shaft of the motor M, and has a disc 5 with slits formed at predetermined intervals on the outer periphery, and a light projecting element and a light receiving element arranged on both sides of the slit of the disc 4 It is comprised by the optical sensor 6 which consists of. When the motor M is driven to rotate the folding rollers A, B, C, and D when the paper P is folded, the number of rotations of the motor M can be detected by a signal output from the encoder 4. The output of the encoder 4 is output to the control unit 3, and the control unit 3 controls the rotational speed of the motor M as described later while grasping the rotational speed of the motor M by this signal.

  The motor M may be a DC servo motor that can continuously control the rotation speed (or rotation speed) and can easily perform PID control using a signal output from the encoder 4, or a pulse to be applied. A stepping motor that can continuously control the rotation speed (or rotation speed) by changing the number may be used.

  As shown in FIGS. 2 to 4, the enclosure folding part 2 includes abutting members S <b> 1 and S <b> 2 that regulate the position of the paper P within the guide G. These two abutting members S1, S2 convey the paper P by the four folding rollers A, B, C, D and the three guides G1 to G3, and fold the paper P in a desired way. This is a member for restricting the position where the paper P hits and stops in the guides G2 and G3 in order to be folded. Here, the folding method of the paper P means a mode in which a rectangular paper P is folded at a desired position at right angles to the conveyance direction and folded into a desired number of paper pieces. For example, as shown in FIG. 2, folding a sheet P into two equal pieces of paper at one fold is called “bi-folding”. Further, as shown in FIG. 3, folding the paper P into three substantially equal pieces of paper at two folds is called “trifold”. Also, as shown in FIG. 4, folding the paper P into four substantially equal pieces of paper at three folds is called “trifold”. In the illustrated examples of FIGS. 2 to 4, the number of sheets P is one in each folding method. However, a plurality of sheets P can be overlapped to be folded in the same manner.

  As shown in FIGS. 2 to 4, the abutting members S <b> 1 and S <b> 2 that regulate the position of the paper P in the guide are shown as plate-like members by broken lines as an example in this embodiment. The second guide G2 is provided with a first abutting member S1. The first butting member S1 is movable between a near position close to the folding roller A shown in FIG. 2 and a far position far from the folding roller A shown in FIG. A second abutting member S2 is provided at a half portion of the third guide G3 provided between the folding rollers B and D on the folding roller B side. As shown in FIG. 2, the second abutting member S2 has a closest position closest to the folding roller C, a farthest position farthest from the folding roller C as shown in FIG. 3, and a first position as shown in FIG. It is movable between an intermediate position that is between the second positions.

  As shown in FIG. 1, the enclosing and sealing apparatus 1 includes an enclosing unit that receives envelope feeding from a printing apparatus or the like (not shown) in the preceding stage. The encapsulating portion 7 is also supplied with the paper P folded at the encapsulated material folding portion 2 described above. The enclosing unit 7 is controlled by the control unit 3, wraps the folded paper P in an envelope paper, and encloses the paper P inside the envelope. In this embodiment, the envelope sheet for folding and manufacturing the envelope is subjected to necessary printing by the preceding printing device and supplied to the enclosing unit 7 of the enclosing and sealing device 1. Therefore, the process performed in the enclosing unit 7 is until the folded paper P is wrapped with the envelope paper. It should be noted that the ready-made envelope may be subjected to necessary printing by a preceding printing device, supplied to the enclosing unit 7 of the enclosing sealing device 1, and the paper P may be enclosed in the envelope.

  As shown in FIG. 1, in the sealed sealing device 1, a crimping unit 8 that crimps an envelope in which a folded sheet P is sealed is provided after the sealing unit 7. The crimping unit 8 is controlled by the control unit 3. As described above, the folded sheet P is wrapped with the envelope sheet in the front-stage enclosing unit 7, but it is not yet an envelope. Therefore, in the crimping portion 8, pressure is applied to the peripheral portion of the envelope paper wrapped inside the envelope P and folded into the envelope shape, and the envelope paper is adhered to the envelope shape with the pressure sensitive adhesive in the portion. To do. Further, the flaps of the envelope are continuously pressed and sealed in the same process. In addition, it is good also as applying the re-wet glue instead of a pressure sensitive adhesive to the part of a flap, and adhere | attaching with the water application means, press means, etc. which were separately provided in the crimping | compression-bonding part 8.

  As shown in FIG. 1, in the sealed sealing device 1, a discharge unit 9 for discharging the completed envelope to the outside is provided at the subsequent stage of the crimping unit 8. The discharge unit 9 includes transport means such as a conveyor controlled by the control unit 3, and the completed envelope can be transported by the transport means to be discharged onto a paper discharge tray (not shown) and stacked neatly.

2. The folding action of the paper P by the inclusion folding device (FIGS. 2 to 4)
The folding action of the paper P by the inclusion folding part 2 will be described with reference to FIGS. For convenience of explanation, the sheets P that are conveyed and have different positions will be described with numbers P1, P2, etc. in order from the earliest in time. Further, as described above, while the folding process of the sheet P is being performed in the inclusion folding unit 2, the control unit 3 continuously drives the motor M, and the four folding rollers A and B are driven. , C, and D are continuously rotating in a predetermined direction at a constant speed.

With reference to FIG. 2, the folding of the paper P will be described.
The paper P1 sent from the printing apparatus in the preceding stage (not shown) is transported along the first guide G1, is sent between the folding rollers A and B, approaches the folding roller A, and the second guide G2. Enter between the folding rollers A. Here, the first abutting member S1 is set at a close position, and the sheet P2 that has abutted against the first abutting member S1 is bent at a substantially intermediate position in the transport direction and is sandwiched between the folding rollers B and C and sent forward. It will be. Here, since the second abutting member S2 is set at a close position, the sheet P2 cannot enter between the folding rollers B and D, and the folding rollers C and D along the second half of the third guide G3 as they are. The paper P3 is folded in half and discharged.

The trifolding of the paper P will be described with reference to FIG.
The paper P1 sent from the printing apparatus in the preceding stage (not shown) is transported along the first guide G1, is sent between the folding rollers A and B, approaches the folding roller A, and the second guide G2. Enter between the folding rollers A. Here, the first abutting member S1 is set at a distant position, and the sheet P2 that abuts on the first abutting member S1 is bent at a position approximately 1/3 rearward in the transport direction and sandwiched between the folding rollers B and C. It will be sent first. Here, since the second abutting member S2 is set at the far position, the sheet P3 enters between the folding rollers B and D along the second guide G2. The sheet P that has struck the second abutting member S2 is bent at approximately one third of the rear in the conveying direction and is sandwiched between the folding rollers C and D and conveyed, and the sheet P4 is folded in three and discharged. The

The quadruple folding of the paper P will be described with reference to FIG.
The paper P1 sent from the printing apparatus in the preceding stage (not shown) is transported along the first guide G1, is sent between the folding rollers A and B, approaches the folding roller A, and the second guide G2. Enter between the folding rollers A. Here, the first abutting member S1 is set at a close position, and the sheet P2 that has abutted against the first abutting member S1 is bent at a substantially intermediate position in the transport direction and is sandwiched between the folding rollers B and C and sent forward. It will be. Here, since the second abutting member S2 is set at the intermediate position, the sheet P enters between the folding rollers B and D along the third guide G3. The sheet P3 that has struck the second abutting member S2 is bent at a position substantially half rearward in the conveying direction and sandwiched between the folding rollers C and D, and conveyed, and the sheet P4 is folded into four and discharged. The

3. Control of the enclosure folding apparatus by the control unit 3 (FIGS. 5 to 9)
Control of the enclosure folding part 2 by the control part 3 is demonstrated with reference to FIGS.
The controller 3 reduces the rotational speed of the motor M when folding the paper as the number of times of folding the paper P is increased, and the rotational speed of the motor to the lower rotational speed until the paper reaches the final folding roller. Control is performed to continuously reduce. The reason why the rotation speed of the motor M in the folding process is set to be low depending on the number of foldings is that the greater the number of foldings, the greater the resistance to bending and folding the paper P, making it difficult to perform folding with high accuracy. Because. For this reason, as the number of foldings is increased, the number of rotations of the motor M is decreased so that the time during which the folding roller sandwiches the paper P becomes longer and the paper P is firmly creased. . The reason why the rotational speed of the motor M is continuously decreased toward the folding process is to prevent a large force from acting on the sheet due to sudden deceleration and damage.

FIG. 5 is a diagram illustrating a control mode of the motor M by the control unit 3, and the folding parts a, b, and c through which the sheet P passes through the inclusion folding part 2 and the passing times, and the folding parts a and b. , C is a diagram showing the relationship between the folding roller speeds for each of the folding methods (folding number) of the paper P. Note that the speed of each folding roller indicated by the vertical axis is a relative value when the speed before entering the folding portion is 1. Further, this speed is not corrected according to the number of sheets and the type of sheet as will be described later, and indicates a speed corresponding only to the number of folding sheets P. Further, in the present embodiment, the motor M and the respective folding roller A, B, C, rather than a multi-stage switching type reduction mechanism or clutch between and D, each folding roller A interlocked with the driving of the motor M, B, Since the speeds of C and D are not switched by the speed reduction mechanism, the rotational speed of the motor M and the rotational speeds of the folding rollers A, B, C, and D are proportional to each other. The “folding roller speed relative value” of the shaft can also be considered as a relative value for the rotational speed of the motor M. In this figure, it is assumed that the speed of the folding roller corresponding to the position of the folding portion is actually achieved immediately before the sheet P reaches the folding portion. Further, since the paper P has a predetermined length in the transport direction, the paper P cannot instantaneously pass through each of the folding portions a, b, c, and actually takes a predetermined time. Although it depends on the speed, it usually takes about 1 second or less.

  In FIG. 5, the case of folding in two is indicated by a solid line. In the present embodiment, the rotational speed of the motor M when only folding is considered is 0.9 in the case of folding in half. The speed before entering the folding part is 1, the speed is reduced until entering the folding part a, the speed becomes 0.9 at the folding part a, and then passes through the folding parts b and c while maintaining the speed 0.9. (Actually, the folding part b does not pass through and does not receive the folding action here), but returns to speed 1 after exiting the folding part c. The reason why the speed has been reduced to 0.9 before entering the folding part a is that if it hits the first abutting member S1 at a high speed, the position may shift due to the reaction and the folding position may become inaccurate. This is to prevent a large force from acting on the paper due to sudden deceleration. The reason why the speed is returned to 1 after exiting the folding part c is to promptly discharge the product after the folding is finished to improve productivity.

  In FIG. 5, the case of tri-folding is indicated by a broken line. In the present embodiment, the rotational speed of the motor M when considering only the folding method is 0.8 in the case of tri-folding. Before and after the folded portion, it overlaps with the line in the case of bi-folding indicated by a solid line. The speed before entering the folding part is 1, the speed is reduced until entering the folding part a, the speed becomes 0.9 at the folding part a, and then the speed is further continuously reduced, and the speed is 0.8 at the folding part c. To reach. After exiting the fold c, the speed returns to 1. The reason for decelerating to the speed 0.9 before entering the folding part a and the reason for returning to the speed 1 after exiting the folding part c are the same as in the case of bi-folding. The reason why the speed is continuously reduced from the folding part a to the folding part c is to prevent a large force from acting on the sheet due to sudden deceleration and damage.

  In FIG. 5, the case of quadruple folding is indicated by a dashed line. In the present embodiment, the rotational speed of the motor M when considering only the folding method is 0.7 in the case of quadruple folding. Before and after the folded portion, it overlaps with the line in the case of bi-folding indicated by a solid line. The speed before entering the folding part is 1, the speed is reduced until the folding part a is entered, the speed is 0.9 at the folding part a, and then the speed is further continuously reduced, and the speed is 0.8 at the folding part b. Finally, the speed reaches 0.7 at the folding part c. After exiting the fold c, the speed returns to 1. The reason for decelerating to the speed 0.9 before entering the folding part a and the reason for returning to the speed 1 after exiting the folding part c are the same as in the case of bi-folding. The reason why the speed is continuously reduced from the folding part a to the folding part c is the same as in the case of tri-folding.

  FIG. 6 is a schematic table showing basic control information in the table data format stored in the storage unit of the control unit 3 in order to control the rotation speed of the motor M according to the number of foldings. It is shown as. If each folding speed is referred to as speeds 1, 2, and 3 for convenience, the speed ratio of the speeds is set to 1 for the conveyance speed before the folding process. In this case, they are 0.9 times, 0.8 times, and 0.7 times, respectively.

  As described above, in the present embodiment, the rotational speed of the motor M (that is, the rotational speed of the folding roller) is reduced as the number of folds is increased. By gradually decreasing the speed continuously from the fold to the fold c, the number of revolutions in each fold is reduced according to the fold order. This is because, when the number of folds is two or more (in the case of three or more folds), the resistance of the fold increases as the later folds. Further, as described above, the damage to the paper P is less when the speed is gradually decreased. That is, by continuously reducing the speed from the folding part a to the folding part c, the shock transmitted from the folding roller to the paper P can be reduced compared to reducing the folding part with a stepped drop. I can say that.

Next, a control method for correcting the number of rotations of the motor M determined according to the number of folds in the table data shown in FIG. 6 according to the number of sheets P sealed in the envelope and the type of the sheet P sealed in the envelope will be described. .
FIG. 7 shows data in a table format used when the control unit 3 corrects the rotational speed of the motor M of the folding roller, and shows the correspondence between the number of inclusions and the correction value of the rotational speed of the motor M. Show. When the number of enclosed sheets is 1, the correction value is 0. Hereinafter, when the number of enclosed sheets is 2 to 5, the correction values are 1 to 4, respectively.

FIG. 8 shows data in a table format used when the control unit 3 corrects the rotation speed of the motor M of the folding roller. The thickness of the enclosure as paper information, the correction value of the rotation speed of the motor M, and the like. The correspondence relationship is shown. When the type (or thickness) of the paper P as the paper information is thin paper, the correction value is −1, when the standard is standard, the correction value is 0, and when the paper is thick paper, the correction value is 1. Although the paper has a basis weight of 49 g / m ² or more, the standard has a basis weight of 62 g / m ² or more, and the cardboard has a basis weight of 100 g / m ² or more and less than 120 g / m ² . is there.

  FIG. 9 is a diagram showing table format data used when the control unit 3 controls the motor M of the folding roller. FIG. 9 shows the speed of the folding roller determined in FIG. 7 and FIG. 8 show the correspondence relationship between the speed of the folding roller and the speed ratio obtained as a result of correction using the correction values of FIG.

Next, the control of the rotation speed of the motor M performed by the control unit 3 will be described with reference to FIGS. 6 to 9 described above.
First, the control unit 3 uses the table data shown in FIG. 6 in the storage unit to determine a basic speed according to the folding method designation information included in the paper folding job data to be executed. Next, using the table data shown in FIG. 7 in the storage unit, a correction value based on the number of sheets P to be enclosed is determined. Next, using the table data shown in FIG. 8 in the storage unit, a correction value according to the type of paper P to be sealed is determined.

  As a specific example of the case where the speed is maximum, the folding method is folded in half, the number of sheets P to be enclosed is one, and the type of the sheet P is thin paper. In this case, the basic speed based on the folding method, the correction value based on the number of sheets P, and the correction value based on the type of the sheets P are 1, 0, and −1, respectively. The numerical value of (−1) = 0 is calculated. That is, the speed is zero. The control unit 3 uses the table data shown in FIG. 9 in the storage unit to drive the motor M at a speed ratio 1 that is 0 speed.

  As a specific example of the case where the speed is minimum, the folding method is four-fold, the number of sheets P to be enclosed is five, and the type of the sheet P is cardboard. In this case, the basic speed based on the folding method, the correction value based on the number of sheets P, and the correction value based on the type of the sheet P are 3, 4, and 1, respectively. Therefore, the control unit 3 adds these to 3 + 4 + 1 = The numerical value of 8 is calculated. That is, the speed is 8. The control unit 3 uses the table data shown in FIG. 9 in the storage unit to drive the motor M at a speed ratio of 0.2, which is a speed 8.

  As described above, the control unit 3 reduces the rotational speed of the motor M that drives the folding roller as the number of times the sheet P is folded, and is sandwiched between the folding rollers when the sheet P passes the folding roller. This makes it possible to lengthen the time for folding. In addition, the control unit performs control to continuously reduce the rotational speed of the motor to the lower rotational speed until the paper reaches the final folding roller, and a large force is applied to the paper due to sudden deceleration and damage. Can be prevented. Furthermore, the control unit 3 reduces the rotation speed of the motor M as the number of sheets P to be folded and folded increases and the thickness of the sheet P to be folded increases. Accordingly, not only the number of folding times of the paper P, but also appropriate folding work conditions can be set corresponding to the change of the number of papers and the change of the paper thickness, and high-precision folding can be performed for various papers or paper groups to be folded. Can be realized.

  In the embodiment described above, the rotational speed of the motor M determined based on the number of times of folding the paper P is basically used, and this is corrected according to both the number of the paper P and the thickness of the paper P. However, in the folding process, the above effect can be obtained correspondingly by simply decreasing the rotational speed of the motor M toward a rotational speed set low according to the number of times of folding the paper P. Even if only one of the correction based on the number of sheets P and the correction based on the thickness of the sheet P is performed, a corresponding effect can be obtained.

  In the embodiment described above, the four folding rollers A, B, C, and D of the enclosure folding part 2 are interlocked with a single motor M without using a complicated speed reduction mechanism or clutch. It was assumed that it was continuously rotating at the same rotational speed during the folding operation. For this reason, the position of the abutting members S1 and S2 provided in the guide is adjusted, the sheet P is abutted against this, the sheet P is bent, and the bent portion is sandwiched between the folding rollers, so that the sheet P is desired. It was folded in the way of folding. However, if each folding roller is controlled individually, it is possible to fold the paper P in a desired folding manner without necessarily having an abutting member.

DESCRIPTION OF SYMBOLS 1 ... Enclosed sealing apparatus 2 ... Enclosed matter folding part as a paper folding apparatus 3 ... Control part P, P1, P2, P3, P4 ... Paper as enclosed A, B, C, D ... Folding rollers G1, G2, G3 ... 1st thru | or 3rd guide S1, S2 ... 1st thru | or 2nd abutting member M ... Motor

Claims (2)

In a paper folding apparatus that folds a paper by sandwiching the paper with at least a pair of folding rollers driven by a motor,
The number of rotations of the motor when folding the sheet is set to be lower as the number of folding is increased, and the rotation speed of the motor is set to a lower rotation speed until the sheet reaches the last folding roller. A sheet folding apparatus comprising a control unit that performs control for continuous reduction. The control unit further performs at least one of control for reducing the rotational speed of the motor as the number of sheets to be folded and folded increases and control for reducing the rotational speed of the motor as the thickness of the paper increases. The sheet folding apparatus according to claim 1.

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