JP2010201724A - Laminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminator which continues conveyance of a sheet to obtain a preferable processing speed and can precisely cut the sheet, even upon the film cutting when performing lamination while exposing the edge of the sheet. <P>SOLUTION: The laminator comprises: an introduction roller 31, a first conveyance roller 16 or the like for continuously introducing and conveying the sheet W while superposing the upstream side edge of a preceding sheet W and the downstream side edge of a succeeding sheet W; a pair of an upper laminating roller 27 and a laminating roller 17 for laminating a continuous film F1 onto the sheet W; a difference detecting part 40 for detecting a difference on a superposition part of the sheet W during conveyance; and a film cutting part 60 for cutting the continuous film F1 with a blade which approaches the film from the outer side and comes into contact with the film, wherein the film cutting part 60 causes the blade to start the approach to the continuous film F1 after a prescribed time from the detection by means of the difference detecting part 40 and, thereby, causes the blade to contact with the continuous film F1 on the difference during conveyance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a laminator that covers a film on the surface of a sheet or sheet including a printed material, and more particularly to a laminator that can coat a film with only the edge of the surface exposed.

  As a conventional laminator capable of exposing only the edge, one described in Patent Document 1 below is known. In this laminator, the preceding sheet is made to wait, the edge of the succeeding sheet is sent to the edge of the sheet, and the sheet is stacked on top of each other by the stacking mechanism, and then the film is arranged on both sheet surfaces. After stopping both sheets, the cutter is operated to cut only the film at the center, and the conveyance of the sheet is resumed to press the film against the preceding sheet.

JP 2000-62124 A

  In such a laminator, the conveyance of the sheet must be interrupted when the sheets are stacked and the film is cut, and the processing speed is reduced accordingly. Further, since the sensor or the feed rotation speed is used for detecting the position of the center of the overlapped portion, the detection position may become inaccurate due to the state of the color of the sheet surface or the deviation during conveyance.

  Therefore, in the case of laminating with the edge exposed, the film according to the first aspect of the present invention continues to convey the sheet even when the film is cut to increase the processing speed and to continue the conveyance. An object of the present invention is to provide a laminator that can be cut accurately even in a cut.

  In order to achieve the above object, the invention according to claim 1 is directed to an introduction unit or a device that continuously introduces and conveys a sheet in a state where the upstream edge of the preceding sheet and the downstream edge of the succeeding sheet are overlapped. A conveying unit; a pair of laminating rollers for laminating a continuous film on the preceding sheet and the succeeding sheet; a step detecting unit for detecting a step at an overlapping portion of the preceding sheet and the succeeding sheet being conveyed; and the continuous film A film cutting part that cuts with a blade that approaches and contacts from the outside, and the film cutting part starts approaching the continuous film after a predetermined time from the detection by the step detection part for the blade Thus, the continuous film is brought into contact with the step being conveyed.

  In order to achieve the object of mechanically quickly and accurately grasping a slight level difference even during conveyance, in addition to the above-mentioned object, the invention according to claim 2 is the above-described invention, wherein the level difference detection unit includes: A detection roller that relatively rolls on the sheet, a small arm that supports the detection roller so as to move up and down, and the small arm are connected to each other, and can be swung with a fulcrum provided adjacent to the connection point. A long arm that is supported, and a detection unit that is provided adjacent to the opposite side of the long arm to the small arm, and that detects swinging of the long arm due to vertical movement of the detection roller or small arm. The step is detected by detection by the detection unit.

  According to a third aspect of the present invention, in addition to the above object, in order to achieve the object of quickly and accurately superimposing the succeeding sheet on the preceding sheet while continuing the conveyance, in the above invention, the introduction unit includes the conveyance unit. An introduction roller that introduces a succeeding sheet in a state of being shifted upward or downward from the preceding sheet being conveyed by, and a one-shot roller having a built-in one-shot clutch and teeth on the outer periphery, Are connected so as to be temporarily accelerated by rotation between the one-shot roller and the teeth of the one-shot roller, and the succeeding sheet has an upstream end of the preceding sheet by the acceleration. It is characterized in that it is introduced in such a manner that its downstream end edge overlaps above or below the edge.

  According to a fourth aspect of the present invention, in addition to the above object, in order to achieve the object of facilitating the subsequent sheet to be more accurately superimposed on the preceding sheet, in the above invention, the introduction portion is provided on the downstream side of the sheet. It is characterized by having an adsorption part for adsorbing the edge.

  According to a fifth aspect of the present invention, in order to achieve the object of achieving a higher quality finish in addition to the above object, in the above invention, the sheet is projected to the film side on the downstream side of the laminating roller. It is characterized by having a warp adjustment section that warps the head.

  In the present invention, the predetermined time can be set to zero.

  According to the present invention, the blade is brought close to the continuous film after a predetermined time from the detection by the step detection unit. Therefore, it is possible to provide a laminator that can accurately cut even in the case of a film cut that continues the conveyance of the sheet and continues the conveyance of the sheet even at the time of the film cut to keep the processing speed at a high level. There is an effect.

It is a side view of the laminator which concerns on this invention. FIG. 2 is an enlarged view of the vicinity of an introduction roller in FIG. 1. FIG. 2 is an enlarged view of the vicinity of an upper laminate roller in FIG. 1. FIG. 2 is an enlarged view of the vicinity of a level difference detection unit in FIG. 1. It is an enlarged view of the film cut part vicinity in FIG. It is the (a) top view of the film cut part in FIG. 5, (b) side view, (c) The side view of a blade part. It is an upper surface schematic diagram of the continuous film thru | or sheet | seat in FIG.

  Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings as appropriate. The embodiment of the present invention is not limited to this example.

  FIG. 1 is a side view of a laminator 1 according to the present invention, and FIG. 2 is an enlarged view of the most upstream side, with the left in each figure (hereinafter the same except for FIG. 6A and FIG. 7) being upstream and right Is downstream. The laminator 1 includes a machine frame 2, a vertically movable stocker 3 on which a rectangular sheet W to be laminated is stacked in the uppermost stream, and a suction unit 10 for introducing the uppermost sheet W in the stocker 3. The loader 4 is provided. The loader 4 or the suction unit 10 is disposed so as to suck the leading edge (downstream edge) of the sheet W on the stocker 3. In addition, the suction part 10 has an air passage (not shown) communicating with the inside of the suction cup-like member, and a pump (not shown) is connected to the air passage. The pump is controlled by control means (not shown) that controls each part of the laminator 1. The sheet W is subjected to on-demand printing here, and is supplied from an adjacent on-demand printing machine.

  Further, a horizontal first table 5 extends downstream on the downstream side of the lower portion of the loader 4, and a second table 6, a third table 7, and a fourth table 8 are further provided in that downstream side. . The first table 5 is slightly lower than the other tables 6 to 8, and the tables 6 to 8 are arranged in the same horizontal plane. Note that the sheet W is sent from upstream to downstream on the tables 5 to 8.

  The laminator 1 is provided with a driving roller 12 connected to a motor (not shown) at the lower portion, and the driving roller 12 and various rollers are appropriately connected by a chain or the like. The motor is controlled by the control means. Further, on the downstream side of the tables 5, 6, 7, and 8, a first transport roller 16, a laminate roller 17, a second transport roller 18, and a third transport roller 19 are provided in order. The roller 22 connected to the driving roller 12 and the chain B1 transmits the rotational force to the second conveying roller 18 by another chain B2, and further, the first conveying roller 16 and the laminating roller 17 are connected to the first conveying roller 16 and the laminating roller 17 by separate chains B3 and B4. 3 transport rollers 19 are driven. Also, a pair of first upper conveying roller 26, upper laminating roller 27, second upper conveying roller 28, and third upper conveying roller 29 are arranged above the rollers 16-19. A discharge unit 30 for the sheet W is provided on the lower side on the upstream side of the third conveyance roller 19. The first transport roller 16, the second transport roller 18, the third transport roller 19, the first upper transport roller 26, the second upper transport roller 28, and the third upper transport roller 29 constitute a transport unit.

  In addition, a one-shot roller C1 incorporating a one-shot clutch (one-way clutch) is connected to the first conveying roller 16, and three teeth C11 are formed on the outer periphery of the side portion of the one-shot roller C1. ing. Further, on the upstream side of the one-shot roller C1, a solenoid C13 for engaging / disengaging the claw C12 with respect to the tooth C11 based on the control by the control means is disposed. Further, the one-shot roller C1 is connected to the introduction roller 31 on the upper side of the first table 5 via a chain B5. The claw C12 has a locking portion C14 up and a connection portion with a piston C15 that can be pushed and pulled by the solenoid C13 down, and a shaft C16 is provided therebetween, so that the piston C15 is pulled when the piston C15 is pulled. When the rotation around C16 moves the locking portion C14 away from the tooth C11 and the piston C15 is pushed (returned), the rotation around the axis C16 causes the locking portion C14 to approach the tooth C11.

  The one-shot roller C1 receives a rotational force from the first conveying roller 16, but when the claw C12 is engaged with the tooth C11, the one-shot roller C1 is prevented from rotating, and at this time, the one-shot clutch is slipping. However, when the solenoid C13 pulls the pawl C12 based on the command from the control means to release it from the tooth C11, the clutch bites and the one-shot roller C1 rotates. The connection between the first conveyance roller 16 and the one-shot roller C1 is adjusted so that this rotation is faster than the first conveyance roller 16. This rotation is transmitted to the introduction roller 31 through the belt B5. Further, since the solenoid C13 returns immediately after pulling the claw C12, this rotation is performed until the claw C12 is engaged with the next tooth C11.

  The introduction roller 31 has a lower introduction roller 32 on the lower side. The loader 4, the introduction roller 31, and the lower introduction roller 32 constitute an introduction unit for the sheet W. The introduction roller 31 receives a rotational force from the first conveying roller 16 via the first upper conveying roller 26 that contacts the first conveying roller 16 or the middle roller 33 that contacts the first conveying roller 16, and is the same as the first conveying roller 16. Rotates at high speed. At this time, the belt B5 also operates, but slips on the belt receiving portion of the one-shot roller C1, and the one-shot roller C1 does not rotate.

  On the other hand, the upper laminating roller 27 incorporates a heater (not shown) and can introduce the continuous film F1 supplied from a film roll set on an upper film roller (not shown). The upper laminating roller 27 is connected to the lower cylinder C2 via a holder 35 for holding the upper laminating roller 27, a side lower arm 36, and a piston C21. The lower arm 36 is a side L-shaped member having a long side and a short side, and a shaft in the width direction is passed through the short side edge and the lower side of the holder 35, and the long side edge A similar shaft is passed through the tip edge of the piston C21, and a similar shaft is also passed through the corner and the machine casing 2.

  When the cylinder C2 ejects the piston C21 based on a command from the control means, the long side edge of the lower arm 36 is pushed, whereby the lower arm 36 rotates around the corner portion, and the short side edge rises to raise the holder 35 to the upper laminating roller 27 rises, and the upper laminating roller 27 moves away from the laminating roller 17. Also, the cylinder C2 pulls (returns) the piston C21 based on a command from the control means, which is the reverse of the pressing, and the upper laminating roller 27 and the laminating roller 17 maintain a laminable distance or the laminating. It is possible to laminate the introduced continuous film F1 on the upper surface of the sheet W.

  Further, as shown in FIG. 3, a warp adjusting portion 37 is disposed on the downstream side of the second transport roller 17. The warp adjustment unit 37 includes a pressing roller 38 and a raising plate 39 that protrudes above the table 7 on the downstream side. The upper part of the raising plate 39 protrudes slightly above the table 7 and warps the conveyed sheet W in a mountain shape (convexly toward the continuous film F1 side). When the continuous film F1 is laminated on the upper surface of the sheet W, the continuous film F1 tends to shrink and tends to warp in a valley shape. However, the raising plate 39 of the warp adjusting portion 37 is conversely the sheet W or continuous. These warpages are adjusted by warping the film F1.

  Further, as shown in FIG. 4, a level difference detection unit 40 is disposed on the downstream side of the warp adjustment unit 37. The step detection unit 40 includes a small roller 42 installed in the machine frame 2 whose upper end is substantially the same as the upper end of the second transport roller 18, a detection roller 44 disposed above the small roller 42, and a detection roller 44. A small arm 48 that can rotate and move up and down around the shaft 46, and a lever that is connected to the small arm 48 so that when the detection roller 44 is raised, the small arm 48 pushes the force point (upper part, around the fulcrum). As a long arm 50 and a detection unit 52 that is provided at the point of action of the long arm 50 (lower part, far from the fulcrum) and detects the movement of the lower part of the long arm 50. The detection unit 52 is electrically connected to the control unit.

  Furthermore, as shown in FIG. 5, a film cut portion 60 is installed on the upper side of the fourth table 8. As shown in FIG. 6, the film cut portion 60 includes a frame 63 having a rail 61 and an upper rail 62 in the width direction, a blade portion 64 on the rail 61, and a ring-shaped chain 65 fixed to the blade portion 64. The motor 66 on the frame 63 for driving the chain 65, the gear 67 on which the chain 65 is engaged, the blade sensor 68 attached to the upper rail 62 and connected to the control means, and the gear 63 in the frame 63 are installed inside the gear 67. And a blade portion sensor 69 connected to the control means.

  The blade portion 64 includes a plate-shaped blade 70, a guide hole 71 that receives the rail 61, and a sensor detected portion 72. The motor 66 is disposed on one end side of the rail 61, and the gear 67 is disposed on the other end side of the rail 61. The blade portion sensor 68 is clamped to the upper rail 62 and can be fixed at an arbitrary position on the upper rail 62.

  The blade 64 is initially stopped at a position corresponding to the fixed position of the blade sensor 68 (usually on the motor side), but when the motor 66 is driven in response to a command from the control means, the chain 65 passes through the chain 65. When traveling along the rail 61 toward the gear 67 side and reaching the installation position of the blade sensor 69, it travels toward the motor 66 due to the reverse rotation of the motor 66 based on the detection of the sensor detected portion 72 and is detected by the blade sensor 68. To stop at the initial position.

  Further, the blade 70 of the blade portion 64 cuts the continuous film F1 at the side on the gear 67 side (the side on the center side at the initial position, Yaiba), but the side is raised (slightly) relative to the other. Therefore, the continuous film F1 can be scooped into the sheet W in a scooped state. In addition, since the blade 70 is a leaf | plate spring, it follows the part of the continuous film F1 which is not closely_contact | adhered to the sheet | seat W by the bending (elasticity). Further, since the blade 70 is long to the downstream side, or is located on the outer side as the yaiba goes to the downstream side, the blade 70 can be advanced by the portion of the continuous film F1 even if the sheet W is conveyed downstream.

  The operation of the laminator 1 configured as described above will be described. As shown mainly in FIG. 2, the control means drives the drive roller 12 to rotate the first transport roller 16 and the introduction roller 31 at a predetermined feed rate (for example, 4 meters per minute). Further, the control means lowers the loader 4 and operates the pump to adsorb and raise the downstream edge of the uppermost sheet W in the stocker 3 at the adsorbing portion 10 and move the adsorbing portion 10 in the downstream direction. The sheet W moves quickly, further releases the suction, returns to the upstream, and introduces the edge of the sheet W between the introduction roller 31 and the lower introduction roller 32. The introduced sheet W is sent downstream by the introduction roller 31 or the first conveying roller 16. The control unit slightly raises the stocker 3 by the thickness of the sheet W.

  When the upstream edge of the sheet W passes through the first conveying roller 16 as shown in FIG. 2 (the sensor (not shown) installed below the middle roller 33 detects the upstream edge of the sheet W). The next sheet W is introduced in the same manner, and the solenoid C13 is operated to rotate the one-shot roller C1, and the introduction roller 31 is temporarily accelerated to increase the next sheet W. Is moved closer to the preceding sheet W, and the downstream edge of the succeeding sheet W is overlapped under the upstream edge of the preceding sheet W. Thereafter, the sheets W are sequentially sent in this overlapping state. The amount of overlap can be adjusted by delay time after sensor recognition, acceleration timing, acceleration speed, and the like.

  Further, mainly as shown in FIG. 3, the sheet W passes between the upper laminating roller 27 and the laminating roller 17 together with the continuous film F1, and the continuous film F1 is laminated on the surface of the preceding sheet W or the succeeding sheet W. The upper laminating roller 27 is appropriately heated by a heater. If the cylinder C2 is operated based on pressing of a switch (not shown) or the like, the upper laminating roller 27 can be raised or lowered during setting or maintenance of the continuous film F1, and the laminating roller 17 is raised by raising the upper laminating roller 27. You can leave a gap between

  Further, after the continuous film F <b> 1 is laminated on the upper surface, the sheet W passes through the warp adjustment unit 37. That is, the sheet W is lifted from the table 7 by the raising plate 39 when passing, and the downstream side of the raising plate 39 is lowered below the raising plate 39 by the pressing roller 38, and is temporarily warped in a mountain shape when passing. Thus, the warpage of the sheet W with the continuous film F1 is adjusted.

  As shown mainly in FIG. 4, the detection roller 44 of the level difference detection unit 40 rolls on the continuous film F <b> 1, but rolls on the overlapping portion of the preceding sheet W and the succeeding sheet W, and from the preceding sheet W to the succeeding sheet. When moving to W, the sheet is slightly lowered by the level difference corresponding to the thickness of the sheet W. As a result of this lowering, the small arm 48 swings around the shaft 46 and pushes the upper portion of the long arm 50. Then, the lower part of the long arm 50 moves more greatly than the lowering or swinging, and the movement is detected by the detection unit 52. Here, the detection unit 52 is a switch pushed by the long arm 50.

  As shown mainly in FIG. 5, when the detection unit 52 detects the passage of a step between the preceding sheet W and the succeeding sheet W, the control means sets a time set by a timer that it has (or is connected to) itself. Counting (predetermined time, for example, 1416 milliseconds) is started. Then, when the control means grasps the elapse of the set time, it drives the motor 66 to run or return the blade portion 64 via the chain 65 or the rail 61. As schematically shown in FIG. 7, the blade portion 64 causes the continuous film F <b> 1 on the level difference between the preceding sheet W and the succeeding sheet W (on the upstream end W <b> 1 of the preceding sheet W in FIG. 7) by starting traveling after the set time. The blade 70 of the blade portion 64 comes in contact so as to scoop the continuous film F1 on the step and cuts the continuous film F1 on the step as it is. The continuous film F1 is slightly lifted from the sheet W on the step, and the blade 70 is plate-shaped, and the blade 70 escapes outward as it goes to the downstream end. Even if there is, the blade 70 follows the step.

  Then, until the blade portion 64 reaches the blade portion sensor 69, the continuous film F1 is completely cut, and a state in which the film F2 cut on the preceding sheet W is laminated is realized. Therefore, the set time is obtained by dividing the distance from the lower part of the detection roller 44 (sheet W contact point) to the point corresponding to the blade 70 on the side of the sheet W (the blade 70 is first applied to the continuous film F1) by the feed speed. The time required for the blade 70 to contact the continuous film F1 for the first time (time to reach the side of the continuous film F1) is set from the time obtained in this manner. Here, as shown in FIG. 7, a continuous film F <b> 1 having a width slightly narrower than the width of the sheet W is laminated so that edge exposed portions are formed on both sides of the sheet W.

  The preceding sheet W on which the film F2 is laminated is discharged to the discharge unit 30 as it is. On the other hand, the succeeding sheet W is in a state in which the continuous film F1 is laminated in a state where the downstream side edge is exposed by the amount overlapped with the upstream side edge of the preceding sheet W, and further succeeding sheet W is obtained at an appropriate timing. The above-mentioned preceding sheet W is formed by being slightly overlapped and conveyed together, and the film F2 can be continuously laminated on the sheet W by repeating the above-described operation.

  In the laminator 1 described above, the introduction roller 31 and the lower introduction roller 32 through the first introduction roller 31 that continuously introduce and convey the sheet W in a state where the upstream edge of the preceding sheet W and the downstream edge of the subsequent sheet W are overlapped. The continuous film F1 is applied to the preceding sheet W and the succeeding sheet W with the conveying roller 16, the second conveying roller 18, the third conveying roller 19, the first upper conveying roller 26, the second upper conveying roller 28, the third upper conveying roller 29, and the preceding sheet W. A pair of upper laminating roller 27 and laminating roller 17 to be laminated, a level difference detecting unit 40 for detecting a level difference at the overlapping portion of the preceding sheet W and the subsequent sheet W being conveyed, and the continuous film F1 are approached and contacted from the outside. A film cut portion 60 that is cut by the cutting blade 70, and the film cut portion 60 detects the blade 70 by the step detection portion 40. Since the approach to the continuous film F1 is started after a predetermined time, the continuous film F1 is brought into contact with the step that is being conveyed. The processing speed in the laminate with the exposed edges can be dramatically improved, and an accurate film cut can be made by applying the blade to the level difference of the sheet W being conveyed.

  The level difference detection unit 40 is connected to the detection roller 44 that relatively rolls on the sheet W, the small arm 48 that supports the detection roller 44 so as to move up and down, and the small arm 48, and is adjacent to the connection portion. The long arm 50 supported so as to be able to swing in a state where the fulcrum is provided, and a long arm 50 by the vertical movement of the detection roller 44 or the small arm 48 provided adjacent to the opposite side of the small arm 48 in the long arm 50. And detecting the step by the detection by the detection unit 52. Therefore, the step can be detected quickly and accurately by the mechanical operation of the detection roller 44, the small arm 48, or the long arm 50. It can be detected and can contribute to accurate film cutting during conveyance.

  Further, the introduction roller 31 introduces the succeeding sheet W in a state of being shifted downward from the preceding sheet W conveyed by the first conveying roller 16 and the like, and incorporates a one-shot clutch and has a tooth C11 on the outer periphery. The succeeding sheet W is connected to the roller C1 and the one-shot roller C1 so as to be temporarily accelerated by the rotation between the teeth C11 of the one-shot roller C1. Since the downstream edge of the sheet is introduced in an overlapping state, the sheet W can be overlapped for exposing the edge while continuing the conveyance, and the processing speed in the laminate that exposes the edge of the sheet W can be performed. Can be drastically improved, and the sheets W can be accurately stacked with a constant stacking amount by the action of the one-shot roller C1.

  Furthermore, since the loader 4 includes a suction portion that sucks the downstream edge of the sheet W, the downstream edge can be accurately introduced, and the subsequent sheet W can be superimposed on the preceding sheet W. It is possible to realize a highly accurate laminate according to the exposed dimension of the edge and the like when executed accurately.

  In addition, since the warp adjusting portion 37 that warps the sheet W convexly toward the continuous film F1 is provided on the downstream side of the laminating roller 17, the warp of the sheet W that tends to warp concavely toward the continuous film F1 side is returned. As a result, the accuracy of the subsequent process can be improved, and the finish itself can be made high quality.

  In addition, the other form of this invention which mainly consists of changing the said form is illustrated. Increase / decrease the number of transport rollers, provide long arms diagonally, laterally or in the width direction, omit small rollers, provide pressing rollers on the downstream side of the raising plate of the warpage adjustment section, or step the warpage adjustment section Other than the above, the number, arrangement, and presence / absence of various members, such as arrangement on the downstream side of the detection unit and the film cut unit, etc. The downstream edge of the succeeding sheet is overlapped with the upper side of the upstream edge of the preceding sheet. The degree of warpage can be adjusted by making it possible to adjust the rising amount of the raising plate of the warp adjusting unit, or to adjust the vertical position of the pressing roller. A block or a roller is provided in place of the raising plate of the warp adjusting portion. When the transport roller is operated (attempted) in a state where the upper laminating roller is separated from the laminating roller, the operation is stopped or stopped, or an error lamp is turned on. A one-shot clutch is connected to the laminating roller so that the laminating roller moves away from or approaches the upper laminating roller. Also, it is laminated to a sheet other than the sheet printed on demand.

1 Laminator 4 Loader (Introduction section)
10 Adsorption part (introduction part)
16 1st conveyance roller (conveyance part)
17 Laminating roller 18 Second transport roller (transport section)
19 Third transport roller (transport section)
26 First upper transport roller (transport section)
27 Upper Laminating Roller 28 Second Upper Conveying Roller (Conveying Unit)
29 Third upper transport roller (transport section)
31 Introduction roller (introduction section)
32 Lower introduction roller 32 (introduction part)
37 Warpage Adjustment Unit 40 Step Detection Unit 44 Detection Roller 48 Small Arm 50 Long Arm 52 Detection Unit 60 Film Cut Unit 70 Blade C1 One Shot Roller C11-C31 Teeth F1 Continuous Film W Sheet (Previous Sheet, Subsequent Sheet)

Claims (5)

An introduction unit or a conveyance unit that continuously introduces and conveys the sheet in a state where the upstream edge of the preceding sheet and the downstream edge of the subsequent sheet are overlapped;
A pair of laminating rollers for laminating a continuous film on the preceding sheet and the succeeding sheet;
A level difference detection unit for detecting a level difference in the overlapping part of the preceding sheet and the subsequent sheet being conveyed;
The continuous film is provided with a film cutting part that cuts with a blade that approaches and contacts from the outside,
The film cut unit starts to approach the continuous film after a predetermined time from the detection by the step detection unit with respect to the blade so as to contact the continuous film on the step being conveyed. Laminator characterized by. The step detector is
A detection roller that rolls relatively on the sheet;
A small arm that supports the detection roller in a vertically movable manner;
A long arm supported so as to be swingable in a state where the small arm is connected and a fulcrum is provided adjacent to the connection point;
A detection unit for detecting swinging of the long arm due to vertical movement of the detection roller or the small arm, provided to be adjacent to the opposite side of the small arm in the long arm;
The laminator according to claim 1, wherein the step is detected by detection by the detection unit. The introduction part is
An introduction roller for introducing a succeeding sheet in a state of being shifted upward or downward from the preceding sheet being conveyed by the conveying unit;
It has a one-shot clutch and a one-shot roller with teeth on the outer periphery.
The introduction roller is connected so as to be temporarily accelerated by the rotation between the teeth of the one-shot roller and the one-shot roller,
3. The succeeding sheet is introduced in a state where the downstream edge of the succeeding sheet overlaps on or below the upstream edge of the preceding sheet by the speed increase. The laminator described. The laminator according to any one of claims 1 to 3, wherein the introduction portion includes an adsorption portion that adsorbs a downstream edge of the sheet. The laminator according to any one of claims 1 to 4, further comprising a warp adjustment portion that projects the sheet convexly toward the film side on the downstream side of the laminating roller.

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