JP6491869B2 - Sheet pasting device - Google Patents

Description

  The present invention relates to a sheet sticking device for sticking a sheet to a terminal.

  As a terminal having a U-shaped barrel portion that is crimped to the electric wire by crimping, a water-stopping material is provided on the inner surface of the portion to be crimped to the wire-covering portion in the barrel portion, There are some which close the gap and stop the water (for example, see Patent Documents 1 and 2).

JP 2014-182957 A JP 2014-160591 A

  By the way, if the position of the water-stopping material is shifted with respect to the barrel part or is not in close contact with the barrel part, there is a possibility that good water-stopping performance between the covered part of the electric wire after swaging cannot be obtained. On the other hand, the barrel portion of the terminal is formed in a U shape in advance in order to receive the end portion of the electric wire. Therefore, a coating operation for applying a water-stopping material to a predetermined position on the inner surface of the U-shaped barrel portion with high accuracy, or affixing a sheet-shaped water-stopping material on the inner surface of the U-shaped barrel portion of the terminal without any gap The work was extremely difficult.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the sheet sticking apparatus which can stick a sheet | seat to a terminal easily and reliably.

In order to achieve the above-described object, the sheet sticking device according to the present invention is characterized by the following (1) and (2).
(1) A sheet sticking device for sticking a water stop sheet to the inner surface of a concave barrel portion formed on a terminal,
A crimping head that is pushed into the barrel portion through the sheet;
A pressing mechanism having a pair of pressing plates that are deformed inward by pressing both sides of the barrel part from the outside;
A sheet sticking device comprising:
(2) The sheet bonding apparatus according to (1), wherein the pressure-bonding head sucks and holds the sheet by a plurality of suction holes formed on a surface thereof.

In the sheet sticking device having the configuration (1), when the crimping head is pushed into the barrel portion of the terminal through the sheet and both sides of the barrel portion are pressed from the outside by the pair of pressing plates and deformed inward, the sheet and the barrel The portion is sandwiched between the crimping head and the pressing plate. Thereby, the sheet | seat for water stop can be pressed against the inner surface of a concave barrel part, and a sheet | seat can be reliably and easily affixed on the predetermined position of the inner surface of a barrel part without gap. Therefore, when the electric wire is crimped on the barrel portion and pressure-bonded, a good water stop performance with respect to the covered portion of the electric wire can be obtained. Moreover, a barrel part can also be shape | molded with the affixing of the sheet | seat to a barrel part by pressing and deform | transforming a barrel part inside with a press plate. Therefore, the width of the barrel portion can be formed wider than the regular shape in advance, and can be formed into a regular shape by pressing with a pressing plate when the sheet is attached to narrow the width of the barrel portion. If it does in this way, in the sticking process of a sheet | seat, interference with the barrel part of the crimping | compression-bonding head pushed into a barrel part can be suppressed.
In the sheet sticking device having the above configuration (2), the inner surface of the barrel portion of the terminal can be easily formed by holding the sheet in the crimping head and pushing it into the barrel portion and pressing the barrel portion inward with the pressing plate to deform it. A sheet can be pasted on. Thereby, the sticking workability | operativity of the sheet | seat to the barrel part of a terminal can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the sheet sticking apparatus which can stick a sheet | seat to a terminal easily and reliably can be provided.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a diagram for explaining a sheet sticking apparatus according to the present embodiment, in which FIG. 1 (a) is a perspective view of the sheet sticking apparatus before sticking a sheet, and FIG. 1 (b) is a sheet when sticking the sheet. It is a perspective view of a sticking device. FIG. 2 is a plan view of a sheet tape having a sheet held by a separator. 3A and 3B are diagrams for explaining a pressing operation by the pressing mechanism. FIG. 3A is a schematic cross-sectional view of the barrel portion of the terminal before pressing by the pressing plate, and FIG. 3B is a pressing by the pressing plate. It is a schematic sectional drawing of the barrel part of the terminal at the time. FIG. 4 is a diagram for explaining each process when a sheet is adhered to the barrel portion of the terminal by the sheet affixing device. FIGS. 4A to 4F are perspective views of the sheet affixing device, respectively. is there. FIG. 5 is a diagram for explaining another embodiment in which a sheet is attached to a barrel portion of a terminal by a crimping head and a pressing plate. FIGS. 5 (a) to 5 (f) are perspective views in respective work steps. FIG.

Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining a sheet sticking apparatus according to the present embodiment, in which FIG. 1 (a) is a perspective view of the sheet sticking apparatus before sticking a sheet, and FIG. 1 (b) is a sheet when sticking the sheet. It is a perspective view of a sticking device. FIG. 2 is a plan view of a sheet tape having a sheet held by a separator. 3A and 3B are diagrams for explaining a pressing operation by the pressing mechanism. FIG. 3A is a schematic cross-sectional view of the barrel portion of the terminal before pressing by the pressing plate, and FIG. 3B is a pressing by the pressing plate. It is a schematic sectional drawing of the barrel part of the terminal at the time.

  As shown in FIG. 1A and FIG. 1B, the sheet sticking device 11 according to the present embodiment is a device for sticking a water stop sheet 6 to the terminal 1.

  The terminal 1 is made of a conductive metal material such as copper or a copper alloy, and is formed by pressing. The terminal 1 has a connection part 2 connected to a counterpart terminal and a U-shaped barrel part 3 to which an electric wire is crimped. The terminal 1 is connected to a carrier 4 formed in a long belt shape on the barrel portion 3 side. The terminals 1 are connected with an interval in the longitudinal direction of the carrier 4. A terminal positioning hole 5 is formed in the carrier 4 at a position corresponding to a connection location with the barrel portion 3. The carrier 4 is moved along the longitudinal direction by a terminal transport mechanism (not shown). Thereby, the terminal 1 connected to the carrier 4 is sequentially conveyed as the carrier 4 moves.

  The sheet 6 affixed to the barrel portion 3 of the terminal 1 is formed by forming an elastic material such as rubber into a sheet shape. The sheet 6 is attached to the inner surface side of the U-shaped barrel portion 3. The sheet 6 has an adhesive applied to the lower surface, which is the side of the surface to which the barrel 3 is applied, and is adhered to the barrel 3 with this adhesive. The sheet 6 is fed into the sheet sticking device 11 in the state of the sheet tape 7. The sheet 6 is disposed at a position spaced apart in the longitudinal direction of the sheet tape 7.

  As shown in FIG. 2, the sheet tape 7 has a release paper 8 and a separator 9, and the sheet 6 is held in a state of being sandwiched between the release paper 8 and the separator 9. The sheet 6 is disposed on the release paper 8 with the sticking surface formed from the lower surface facing the release paper 8 side. The surface of the release paper 8 is coated with silicon, so that the release paper 8 can be easily peeled off from the sticking surface to which the adhesive of the sheet 6 is applied. The separator 9 is disposed on the upper surface side of the sheet 6 that is disposed on the release paper 8 with an interval. The separator 9 is a film made of, for example, polyethylene terephthalate (PET), and the lower surface on the sheet 6 side is coated with an adhesive having a sufficiently weaker adhesive strength than the adhesive on the application surface of the sheet 6. Thereby, the separator 9 is stuck to the upper surface of the sheet 6. The separator 9 has a larger width dimension than the release paper 8. On one side of the separator 9, sheet positioning holes 10 are formed in a portion protruding from the release paper 8 with an interval in the longitudinal direction. These sheet positioning holes 10 are formed on the sides of the respective sheets 6.

  The sheet sticking apparatus 11 includes a transport stage 21, a sticking mechanism 31, a transport mechanism 41, and a pressing mechanism 51.

  The transfer stage 21 is formed in a long plate shape, and has a groove-shaped transfer path 22 in the upper part thereof. The sheet tape 7 having the sheet 6 is fed into the conveyance path 22 in the conveyance direction A. In the transport path 22 of the transport stage 21, an opening 23 is formed at a substantially intermediate portion in the longitudinal direction. In the sheet tape 7 fed into the conveyance path 22, the lowermost release paper 8 is folded downward at the opening 23. A release paper take-up roll (not shown) is provided on the upstream side of the transport direction A of the sheet tape 7 in the transport stage 21, and the release paper 8 that is folded back below the transport stage 21 through the opening 23 is the release paper roll. It is wound up by a take-up roll. As a result, the release paper 8 is peeled off at the upstream edge of the opening 23, and the sheet tape 7 is conveyed downstream without the release paper 8. Accordingly, the sheet 6 is conveyed in a state of being held on the lower surface side of the separator 9 on the downstream side of the upstream edge portion of the opening 23. A lower side of the transport stage 21 is a terminal transport path 24, and the terminal 1 connected to the carrier 4 is transported in the transport direction A by the terminal transport mechanism.

  The pasting mechanism 31 is provided above the opening 23 in the transport stage 21. The sticking mechanism 31 has a pressure bonding head 32 and a positioning head 33. Each of the pressure-bonding head 32 and the positioning head 33 can be moved up and down by an elevating mechanism (not shown).

  The crimping head 32 has a U-shaped outer shape along the inner shape of the barrel portion 3 of the terminal 1 at the lower portion. The crimping head 32 passes through a standby position (position shown in FIG. 1A) above the conveyance path 22 of the conveyance stage 21 and the opening 23 of the conveyance path 22, and is a terminal disposed on the lower side of the conveyance stage 21. 1 is moved up and down between the crimping position (the position shown in FIG. 1B) that has entered the barrel portion 3. When the crimping head 32 is lowered from the standby position to the crimping position, the sheet 6 is pushed down together with the separator 9 by the crimping head 32 and is pushed into the barrel portion 3 of the terminal 1.

  The positioning head 33 has a U-shaped outer shape at the bottom. The positioning head 33 is provided with a positioning pin 34 extending downward at the lower end thereof. The positioning pin 34 has an outer diameter that can be inserted into the sheet positioning hole 10 formed in the separator 9 of the sheet tape 7 and the terminal positioning hole 5 formed in the carrier 4. The positioning head 33 passes through a standby position (a position shown in FIG. 1A) where the lower end of the positioning pin 34 is disposed above the transport path 22 of the transport stage 21 and the opening 23 of the transport path 22, and then the transport stage. It is moved up and down between a positioning position (position shown in FIG. 1 (b)) that is arranged on the lower side of 21 and is in contact with the carrier 4. When the positioning head 33 is lowered, the sheet positioning hole 10 of the separator 9 and the terminal positioning hole 5 of the carrier 4 are arranged at positions passing through the axis of the positioning pin 34. As a result, when the positioning head 33 is lowered to the positioning position, the positioning pin 34 is inserted into the sheet positioning hole 10 of the separator 9 and the terminal positioning hole 5 of the carrier 4 and protrudes downward of the carrier 4.

  The transport mechanism 41 includes an upstream transport unit 42 and a downstream transport unit 43. The upstream side transport unit 42 and the downstream side transport unit 43 can be moved up and down by a lifting mechanism (not shown). Further, each of the upstream side conveyance unit 42 and the downstream side conveyance unit 43 can be moved along the conveyance path 22 by a moving mechanism (not shown).

  The upstream conveyance unit 42 is disposed on the upstream side in the conveyance direction A with respect to the sticking mechanism 31. The upstream conveyance unit 42 has a locking pin 44 at its lower end. The locking pin 44 has an outer diameter that can be inserted into the sheet positioning hole 10 formed in the separator 9 of the sheet tape 7 to lock the separator 9. The upstream conveying unit 42 includes a non-locking position where the locking pin 44 is disposed above the sheet tape 7 and a locking pin 44 inserted into the sheet positioning hole 10 of the separator 9 of the sheet tape 7. It is moved up and down between the locking position where 9 is locked.

  The downstream conveyance unit 43 is disposed on the downstream side in the conveyance direction A with respect to the sticking mechanism 31. The downstream transport unit 43 has a locking pin 45 at its lower end. The locking pin 45 has an outer diameter that can be inserted into the sheet positioning hole 10 formed in the separator 9 of the sheet tape 7 to lock the separator 9. The downstream conveyance unit 43 includes a non-locking position where the locking pin 45 is disposed above the sheet tape 7 and a locking pin 45 inserted into the sheet positioning hole 10 of the separator 9 of the sheet tape 7. It is moved up and down between the locking position where 9 is locked.

  The pressing mechanism 51 is provided below the terminal conveyance path 24. The pressing mechanism 51 is disposed at a position facing the pasting mechanism 31 through the opening 23 of the transport stage 21. The pressing mechanism 51 includes a pair of pressing plates 52. These pressing plates 52 are disposed on both sides of the barrel portion 3 of the terminal 1 disposed below the opening 23. The pressing plate 52 is supported so that the edge portions adjacent to each other can rotate around an axis along the terminal 1. Each pressing plate 52 is rotated in the opposite direction, and is moved between a standby position away from the barrel portion 3 of the terminal 1 and a pressing position that presses the barrel portion 3 of the terminal 1 and deforms it inward. .

  As shown in FIG. 3A, when the crimping head 32 is lowered to the crimping position and the sheet 6 is pushed into the barrel portion 3 of the terminal 1 together with the separator 9 by the crimping head 32, as shown in FIG. Furthermore, each pressing plate 52 arranged at the standby position of the pressing mechanism 51 is rotated inward (in the direction of arrow B in FIG. 3B) and arranged at the pressing position. Thereby, the barrel portion 3 is pressed and deformed inward (in the direction of arrow C in FIG. 3B). As a result, the sheet 6 and the barrel portion 3 are sandwiched between the crimping head 32 and the pressing plate 52, the attachment surface of the sheet 6 is pressed against the inner surface of the barrel portion 3 of the terminal 1, and the sheet 6 is attached to the barrel portion 3. It is done.

  Next, the case where the sheet | seat 6 is affixed on the barrel part 3 of the terminal 1 by the sheet | seat sticking apparatus 11 of the said structure is demonstrated.

  FIG. 4 is a diagram for explaining each process when a sheet is adhered to the barrel portion of the terminal by the sheet affixing device. FIGS. 4A to 4F are perspective views of the sheet affixing device, respectively. is there.

  As shown to Fig.4 (a), the sheet sticking apparatus 11 will be in a sheet sticking preparation state. In this sheet application preparation state, an unattached terminal 1 to which the sheet 6 is not attached is disposed below the opening 23 of the transport stage 21. In addition, the locking pins 44 and 45 of the upstream conveyance unit 42 and the downstream conveyance unit 43 of the conveyance mechanism 41 are inserted into the sheet positioning holes 10 of the separator 9 to hold the separator 9, and the release paper 8 in the separator 9 is The sheet 6 held at the peeled location is disposed in the opening 23 of the transport stage 21.

(Positioning process)
As shown in FIG. 4B, the positioning head 33 of the sticking mechanism 31 is lowered (see arrow D in FIG. 4B), and the positioning pins 34 of the positioning head 33 are connected to the sheet positioning holes 10 and 10 of the separator 9. The sheet 6 and the terminal 1 are positioned through the terminal positioning hole 5 of the carrier 4.

(Attaching process)
When the lower end of the positioning head 33 is at the same height as the lower end of the crimping head 32, the crimping head 32 is lowered together with the positioning head 33 (see arrow D in FIG. 4B). As a result, the separator 9 is pushed down by the pressure-bonding head 32 and the positioning head 33 in the opening 23. At this time, the upstream side conveyance part 42 and the downstream side conveyance part 43 of the conveyance mechanism 41 move toward the opening part 23 following the separator 9 drawn downward by the opening part 23 (in FIG. 4B). (See arrow E). As a result, the separator 9 is uniformly applied with a predetermined tension that does not sag on the upstream side and the downstream side with respect to the downward pressing position by the crimping head 32 and the positioning head 33. Therefore, the sheet 6 held by the separator 9 is pushed down by the pressure bonding head 32 and the positioning head 33 without difficulty.

  As shown in FIG. 4C, when the crimping head 32 descends to the crimping position and is pushed into the barrel portion 3 of the terminal 1, each pressing plate 52 of the pressing mechanism 51 is rotated to move to the pressing position. (See arrow B in FIG. 4C). Thus, the barrel portion 3 is pressed and deformed inward by the pressing plate 52, and the sheet 6 and the barrel portion 3 are sandwiched between the crimping head 32 and the pressing plate 52. Thereby, the sticking surface of the sheet 6 is pressed against the inner surface of the barrel portion 3 of the terminal 1, and the sheet 6 is stuck to the barrel portion 3.

(Separation process)
As shown in FIG. 4D, each pressing plate 52 of the pressing mechanism 51 is rotated to move to the standby position, and the pressing of the barrel portion 3 by the pressing plate 52 is released. Further, the pressure-bonding head 32 and the positioning head 33 of the sticking mechanism 31 are raised to the standby position (see arrow F in FIG. 4D).

(Peeling process)
As shown in FIG. 4E, the upstream side transport unit 42 and the downstream side transport unit 43 of the transport mechanism 41 move in directions away from each other (see arrow G in FIG. 4E). Then, the separator 9 is pulled to both sides with the sheet 6 affixed to the barrel portion 3 as a boundary, tension is applied to the portion pulled downward by the opening 23 and is peeled off from the sheet 6, and the conveyance path 22 is returned.

(Feeding process)
As shown in FIG. 4 (f), the upstream side conveyance portion 42 of the conveyance mechanism 41 is raised (see arrow H in FIG. 4 (f)), and the locking pin 44 is pulled out from the sheet positioning hole 10 of the separator 9, The downstream transport unit 43 moves downstream (see arrow I in FIG. 4 (f)). Thereby, the separator 9 is sent in the conveyance direction A, and the sheet 6 to be attached next is disposed in the opening 23. Further, the carrier 4 is sent out in the conveyance direction A by the terminal conveyance mechanism, and the unattached terminal 1 to which the sheet 6 is next attached is arranged below the opening 23. Thereafter, the upstream side conveyance unit 42 of the conveyance mechanism 41 is lowered, and the locking pin 44 is inserted into the sheet positioning hole 10 of the separator 9. Further, the downstream side conveyance portion 43 of the conveyance mechanism 41 is raised, the locking pin 45 is pulled out from the sheet positioning hole 10 of the separator 9, further moves to the upstream side and descends, and one upstream side in the separator 9. The locking pin 45 is inserted into the sheet positioning hole 10. Thereby, the sheet sticking apparatus 11 is set to a sheet sticking preparation state (see FIG. 4A).

  Thus, according to the sheet sticking device 11 according to the present embodiment, the crimping head 32 is pushed into the barrel portion 3 of the terminal 1 via the sheet 6, and both sides of the barrel portion 3 are outside by the pair of pressing plates 52. When the sheet 6 is pressed and deformed inward, the sheet 6 and the barrel portion 3 are sandwiched between the crimping head 32 and the pressing plate 52. Thereby, the water stop sheet | seat 6 can be pressed on the inner surface of the U-shaped barrel part 3, and the sheet | seat 6 can be reliably and easily affixed on the predetermined position of the inner surface of the barrel part 3 without a gap. Therefore, when the electric wire is crimped to the barrel portion 3 and crimped, a good water stop performance with the covered portion of the electric wire can be obtained. Further, by pressing the barrel portion 3 inward with the pressing plate 52 and deforming it, the barrel portion 3 can be molded together with the sheet 6 attached to the barrel portion 3. Therefore, the width of the barrel portion 3 is formed wider than the regular shape in advance, and is pressed by the pressing plate 52 when the sheet 6 is attached, so that the width of the barrel portion 3 is narrowed and formed into the regular shape. it can. If it does in this way, in the pasting process of sheet 6, interference with barrel part 3 of crimping head 32 pushed into barrel part 3 can be controlled.

  Next, another embodiment in which the sheet 6 is attached to the barrel portion 3 of the terminal 1 will be described. Note that the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 is a diagram for explaining another embodiment in which a sheet is attached to a barrel portion of a terminal by a crimping head and a pressing plate. FIGS. 5 (a) to 5 (f) are perspective views in respective work steps. FIG.

  As shown in FIG. 5A, the sheet 6 is fed onto the conveyance plate 61 while being held on the release paper 8. The release paper 8 is folded back at the edge of the conveyance plate 61. As a result, the sheet 6 is peeled off from the release paper 8 at the edge of the transport plate 61. A sheet adsorber 62 is provided above the edge of the conveyance plate 61. The sheet adsorber 62 is formed in a cylindrical shape, and a lower end portion thereof has a net-like adsorption surface 63. The sheet suction unit 62 sucks outside air from the suction surface 63, thereby sucking and holding the sheet 6 peeled off from the release paper 8 to the suction surface 63.

  As shown in FIG. 5B, the sheet adsorber 62 moves above the sheet bending device 65 to release the suction, thereby placing the sheet 6 on the surface of the sheet bending device 65. The surface of the sheet bending device 65 is coated with silicon, so that even if the sheet 6 is placed on the surface, the adhesive on the lower surface side of the sheet 6 does not adhere. The sheet bending device 65 includes a fixed portion 66 and a rotating portion 67 provided on both sides of the fixed portion 66. The rotation part 67 is connected to the fixed part 66 so as to be rotatable about an axis extending in the same direction, and is rotated upward relative to the fixed part 66.

  As shown in FIG. 5C, the crimping head 32 is moved on the sheet bending device 65. The crimping head 32 has a plurality of suction holes (not shown) on its surface, and sucks outside air from these suction holes.

  As shown in FIG. 5D, when the crimping head 32 moves on the sheet bending device 65, the rotation unit 67 of the sheet bending device 65 rotates upward. Accordingly, the sheet 6 disposed on the sheet bending device 65 is bent so as to cover the lower portion of the crimping head 32 and is adsorbed by the crimping head 32.

  As shown in FIG. 5E, the crimping head 32 moves onto the barrel portion 3 of the terminal 1 while adsorbing the sheet 6 to the lower portion thereof.

  As shown in FIG. 5 (f), the crimping head 32 with the sheet 6 attracted to the lower part thereof moves down to the crimping position toward the barrel portion 3 of the terminal 1. Next, each pressing plate 52 of the pressing mechanism 51 is rotated to move to the pressing position. Thereby, the barrel portion 3 is pressed and deformed inward, and the sheet 6 and the barrel portion 3 are sandwiched between the crimping head 32 and the pressing plate 52. Thereby, the sticking surface of the sheet 6 is pressed against the inner surface of the barrel portion 3 of the terminal 1, and the sheet 6 is stuck to the barrel portion 3.

  According to the other embodiment described above, the terminal 1 can be easily formed by holding the sheet 6 on the crimping head 32 and pushing the sheet 6 into the barrel portion 3 and pressing the barrel portion 3 inward with the pressing plate 52 to be deformed. The sheet 6 can be attached to the inner surface of the barrel portion 3. Thereby, the sticking workability | operativity of the sheet | seat 6 to the barrel part 3 of the terminal 1 can be improved.

  In the sheet sticking apparatus 11 according to the above embodiment, the sheet 6 can be stuck to the inner surface of the concave barrel portion 3 other than the U-shape by changing the outer shape of the crimping head 32. .

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

Here, the features of the above-described embodiment of the sheet pasting device according to the present invention will be briefly summarized and listed in the following [1] and [2], respectively.
[1] A sheet sticking device (11) for sticking a water stop sheet (6) to the inner surface of a concave barrel portion (3) formed in a terminal (1),
A crimping head (32) pushed into the barrel part (3) through the sheet (6);
A sheet sticking device comprising: a pressing mechanism (51) having a pair of pressing plates (52) for pressing both sides of the barrel portion (3) from the outside to deform inward.
[2] The sheet sticking device according to [1], wherein the pressure-bonding head (32) sucks and holds the sheet (6) through a plurality of suction holes formed on a surface thereof.

1: Terminal 3: Barrel 6: Sheet 11: Sheet pasting device 32: Crimping head 51: Pressing mechanism 52: Pressing plate

Claims (2)

A sheet affixing device for affixing a water stop sheet to the inner surface of the concave barrel portion formed on the terminal,
A crimping head that is pushed into the barrel portion through the sheet;
A pressing mechanism having a pair of pressing plates that are deformed inward by pressing both sides of the barrel part from the outside;
A sheet sticking device comprising:   The sheet bonding apparatus according to claim 1, wherein the pressure bonding head sucks and holds the sheet by a plurality of suction holes formed on a surface thereof.

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