JP7016483B2 - Sheet material transfer device, printing device - Google Patents

Description

The present invention relates to a sheet material transporting device and a printing device.

As a printing device, for example, there is a device that carries out printing while carrying a sheet material on a rotating member such as a drum.

Conventionally, it is known that the tip of the sheet material is grasped by a gripper provided on the drum to imitate the peripheral surface of the drum, the sheet material is transported by the rotation of the drum, and the sheet material is sequentially transferred while being transferred to the drum on the downstream side. (Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-100891

However, the gripper disclosed in Patent Document 1 has a problem that the sheet material flutters when the sheet material is replaced, and stable transportation cannot be performed.

The present invention has been made in view of the above problems, and an object of the present invention is to stably convey a sheet material.

In order to solve the above problems, the sheet material transporting device according to the present invention is
At least two rotating members that support the sheet material, and
A first gripping means, which is arranged on one of the rotating members and includes a first claw portion and a first claw stand for gripping the tip portion of the sheet material,
A second gripping means, which is arranged on the other rotating member and grips the tip end portion of the sheet material, includes a second claw portion and a second claw stand.
In the axial direction of the rotating member, the first claw stand and the second claw stand are arranged so that their ends overlap each other when the sheet material is passed between the two rotating members. ..

According to the present invention, the sheet material can be stably conveyed.

It is a schematic explanatory drawing of the printing apparatus which concerns on 1st Embodiment of this invention. It is a plane explanatory view of the ejection unit of the printing apparatus. It is explanatory drawing around the transport drum which provides the explanation of the behavior at the time of transporting a sheet material by a transport drum. It is explanatory drawing around the transfer drum and the transfer body. Similarly, it is a plan view of the first gripping means and the second gripping means. It is an enlarged explanatory view of FIG. It is an enlarged explanatory view of FIG. It is an enlarged explanatory view explaining the 1st example of the 1st gripping means. It is an enlarged explanatory view which also explains the 2nd example. It is explanatory drawing which provides the explanation of the operation of changing the sheet material from the 2nd gripping means to the 1st gripping means. Similarly, it is a perspective explanatory view when the first gripping means and the second gripping means are changing the grip. It is explanatory drawing of the holding state when the sheet material is thin paper and thick paper. It is explanatory drawing of the part of the 1st gripping means and the 2nd gripping means in the comparative example. It is explanatory drawing of the part of the 1st gripping means and the 2nd gripping means in the 2nd Embodiment of this invention. It is explanatory drawing of the part of the 1st gripping means and the 2nd gripping means in the 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic explanatory view of a printing device according to the embodiment, and FIG. 2 is a plan explanatory view of an example of a ejection unit of the printing device.

The printing device 1 includes a carry-in section 10, a printing section 20, a drying section 30, and a carry-out section 40. In the printing apparatus 1, the printing unit 20 applies a liquid to the sheet material P, which is a sheet-like member carried in from the carrying-in unit 10, to perform required printing, and the drying unit 30 applies the liquid adhering to the sheet material P to the sheet material P. After drying, the sheet material P is discharged to the carry-out section 40.

The carry-in unit 10 includes a carry-in tray 11 on which a plurality of sheet materials P are loaded, a feeding device 12 that separates and sends out the sheet material P one by one from the carry-in tray 11, and a resist that feeds the sheet material P to the printing unit 20. It has a roller pair of 13.

As the feeding device 12, any feeding device such as a device using rollers and rollers and a device using air suction can be used. The sheet material P sent out from the carry-in tray 11 by the feeding device 12 is sent out to the printing unit 20 by driving the resist roller pair 13 at a predetermined timing after the tip of the sheet material P reaches the resist roller pair 13.

The printing unit 20 has a transport drum 21 which is a rotating member (first rotating member) that supports and transports the sheet material P on the outer peripheral surface, and a liquid that discharges liquid toward the sheet material P supported on the transport drum 21. It is provided with a discharge unit 22.

Further, the printing unit 20 is conveyed by the transfer cylinder 24, which is a rotating member (second rotating member) that receives the sent sheet material P and transfers the sheet material P to and from the transport drum 21, and the transport drum 21. A delivery drum 25 for delivering the sheet material P to the drying unit 30 is provided.

The tip of the sheet material P transported from the carry-in unit 10 to the printing unit 20 is gripped by a second gripping means (sheet gripper) 52 provided on the transfer cylinder 24, which will be described later, and is conveyed as the transfer cylinder 24 rotates. Will be done. The sheet material P conveyed by the transfer cylinder 24 is transferred to the transfer drum 21 at a position facing the transfer drum 21.

A first gripping means (seat gripper) 51 is also provided on the surface of the transport drum 21, and the tip of the sheet material P is gripped by the first gripping means (seat gripper) 51. A plurality of suction holes are dispersedly formed on the surface of the transport drum 21. The suction device 26, which is a suction stage, generates a suction airflow inward from the suction port of the transport drum 21.

The tip of the sheet material P transferred from the transfer cylinder 24 to the transfer drum 21 is gripped by the first gripping means 51, and is sucked onto the transfer drum 21 by the suction airflow from the suction device 26. Is carried along with the rotation of the drum.

The liquid discharge unit 22 includes a discharge unit 23 (23A to 23F) which is a liquid discharge means. For example, the discharge unit 23A is a cyan (C) liquid, the discharge unit 23B is a magenta (M) liquid, the discharge unit 23C is a yellow (Y) liquid, and the discharge unit 23D is a black (K) liquid. Discharge each. Further, the discharge units 23F and 23F are used for discharging any of YMCK or a special liquid such as white or gold (silver). Further, a discharge unit for discharging a treatment liquid such as a surface coating liquid can also be provided.

As shown in FIG. 2, the discharge unit 23 is, for example, a full line in which a plurality of liquid discharge heads (hereinafter, simply referred to as “heads”) 100 having a nozzle row 101 in which a plurality of nozzles are arranged are arranged on a base member 102. It is a type head.

The discharge operation of each discharge unit 23 of the liquid discharge unit 22 is controlled by a drive signal corresponding to the print information. When the sheet material P supported on the transport drum passes through the region facing the liquid discharge unit 22, liquids of each color are discharged from the discharge unit 23, and an image corresponding to the print information is printed.

The drying unit 30 conveys (suctions and conveys) the drying mechanism unit 31 for drying the liquid adhering on the sheet material P by the printing unit 20 and the sheet material P conveyed from the printing unit 20 in a sucked state. ) It is provided with a suction transfer mechanism unit 32.

The sheet material P conveyed from the printing unit 20 is received by the suction transfer mechanism unit 32, then conveyed so as to pass through the drying mechanism unit 31, and is delivered to the carry-out unit 40.

When passing through the drying mechanism portion 31, the liquid on the sheet material P is subjected to a drying treatment. As a result, the liquid content such as water in the liquid evaporates, the colorant contained in the liquid is fixed on the sheet material P, and the curl of the sheet material P is suppressed.

The carry-out unit 40 includes a carry-out tray 41 on which a plurality of sheet materials P are loaded. The sheet material P conveyed from the drying unit 30 is sequentially stacked and held on the carry-out tray 41.

In the printing apparatus 1, for example, a pretreatment unit for pretreating the sheet material P is arranged on the upstream side of the printing unit 20, or after the sheet material P to which the liquid is attached is post-processed. The processing unit may be arranged between the drying unit 30 and the carrying-out unit 40.

Examples of the pretreatment unit include those that perform a precoating treatment in which a treatment liquid for reacting with a liquid to suppress bleeding is applied to the sheet material P. Further, as the post-processing unit, for example, a sheet reversal transfer process for reversing the sheet printed by the printing unit 20 and sending it to the printing unit 20 again for printing on both sides of the sheet material P, or a plurality of sheets are used. Examples include those that perform binding processing.

Further, although the example in which the liquid ejection means is provided as the printing unit is described, printing can be performed by means other than the liquid ejection means.

Next, the behavior when the sheet material is conveyed by the conveying drum will be described with reference to FIG. FIG. 3 is an explanatory diagram around the transport drum used for the same explanation.

The transport drum 21 is provided with a first gripping means 51 for gripping the tip end portion of the sheet material P. A leveling roller 28 is arranged on the peripheral surface of the transport drum 21 on the downstream side of the transfer cylinder 24.

Then, as shown in FIG. 3A, the sheet material P passed from the transfer cylinder 24 to the transfer drum 21 has its tip gripped by the first gripping means 51 and passes through the leveling roller 28. It is pressed against the peripheral surface of the transport drum 21.

Next, as shown in FIG. 3B, after the suction port 29 by the suction device 26 passes through the leveling roller 28, air suction by the suction device 26 acts on the suction port 29 to rotate the circumference of the transport drum 21. The sheet material P is brought into close contact with the surface and conveyed toward the discharge position by the discharge unit 23 of the liquid discharge unit 22.

Next, the means for gripping the transport drum and the transfer drum will be described with reference to FIGS. 4 to 7. 4 is an explanatory view of the transport drum and the circumference of the transfer drum, FIG. 5 is a plan view of the first gripping means and the second gripping means, FIG. 6 is an enlarged explanatory view of FIG. 5, and FIG. 7 is an enlarged explanatory view of FIG. Is.

The transport drum 21 is provided with a first gripping means 51. The first gripping means 51 includes a first claw portion 61 for gripping the tip end portion of the sheet material P and a first claw stand 62. The transfer cylinder 24 includes a second claw portion 63 for gripping the tip end portion of the seat P and a second claw stand 64.

As shown in FIG. 5, the first gripping means 51 and the second gripping means 52 are arranged in a staggered manner in the axial direction of the rotating member (conveying drum 21, transfer drum 24). Further, a gap G exists between the first claw base 62 and the second claw base 64 when they face each other.

Further, when the sheet material P is changed from the second gripping means 52 to the first gripping means 51 in order to transfer the sheet material P from the passing cylinder 24 to the transport drum 21 in the axial direction of the rotating member, the first gripping means is performed. The ends of the first claw base 62 of the means 51 and the second claw base 64 of the second gripping means 52 are arranged so as to overlap each other.

That is, as shown in FIGS. 6 and 7, the first claw base 62 and the second claw base 64 pass the sheet material P from the second gripping means 51 to the first gripping means 51 in the axial direction (holding). It is arranged in a staggered manner in the axial direction so that a region S where the ends of the first claw base 62 and the second claw base 64 overlap each other is formed.

At this time, the first claw portion 61 and the second claw portion 62 are both on the first claw base 62 and the second claw base 64 in the region S where the ends of the first claw base 62 and the second claw base 64 overlap. It is provided in a non-opposing area.

Here, different examples of the first gripping means will be described with reference to FIGS. 8 and 9. FIG. 8 is an enlarged explanatory view for explaining the first example of the first gripping means, and FIG. 9 is an enlarged explanatory view for explaining the second example.

In the first gripping means 51 of the first example shown in FIG. 8, the first claw portion 61 is formed of, for example, a thin plate of 1 mm or less, and the tip portion 61a for gripping the sheet material P with the first claw stand 62 is provided. It is folded. It is also possible to provide a protrusion at the tip of the first claw portion 61 so that only the protrusion is in contact with the sheet material P.

The first claw portion 61 is fixedly held by a claw holding member 65 arranged inside the peripheral surface of the transport drum 21. The claw holding member 65 is rotatably arranged by a support shaft 66, and includes a cam mechanism including a cam member 67 that rotates the first claw portion 61 via the claw holding member 65.

As a result, the first claw portion 61 has a position where the tip portion 61a grips the sheet material P (holds the sheet material) between the tip portion 61a and the first claw base 62 by moving the cam member 67, and the tip portion. The 61a is rotated from the position where the sheet material P is separated (the sheet material is separated).

In this case, the first claw base 62 has no inclined portion, and the tip portion of the sheet material P bends when the tip portion 61a of the first claw portion 61 grips the sheet material P with the first claw base 62. There is nothing to do.

Further, the surface of the first claw base 62 facing the first claw portion 61 is a machined surface, and the first claw portion 61 is pressed against the machined surface via the sheet material P to form the first claw portion 61. Bending error can be minimized.

In the first gripping means 51 of the second example shown in FIG. 9, the first claw portion 61 has a bending angle of the tip portion 61a slightly sharper than a desired angle. As a result, the tip portion 61a is pressed against the machined surface of the first claw base 62 to have the same surface accuracy as the machined surface, so that the processing error can be minimized.

The bending angle of the tip portion 61a of the first claw portion 61 is not limited to 90 °, but may be within the range of 120 ° to 90 °.

The configuration of the second gripping means 52 is also the same as that of the first gripping means 51. A cam mechanism including a cam 68 for rotating between a position where the sheet material P is gripped and a position where the tip portion 63a is separated from the sheet material P is provided.

Next, the operation of changing the sheet material from the second gripping means to the first gripping means will be described with reference to FIGS. 10 to 12. FIG. 10 is an explanatory view used to explain the same operation, FIG. 11 is a perspective explanatory view when the first gripping means and the second gripping means are used for replacement, and FIG. 12 shows a case where the sheet material is thin paper and It is explanatory drawing of the holding state when it is a thick paper.

While the transport drum 21 and the transfer drum 24 rotate in the directions of arrows in FIG. 10, the tip of the sheet material P gripped by the second gripping means 52 of the transfer drum 24 is gripped by the first gripping means 51 of the transport drum 21. Perform the grip change with.

At this time, the second gripping means 52 of the transfer drum 24 opens and closes the second claw portion 63 by the operation of the cam 68, and the first gripping means 51 of the transport drum 21 opens and closes the first claw portion 61 by the operation of the cam 67. To. As a result, the tip end portion of the sheet material P is handed over from the second gripping means 52 to the first gripping means 51 (this is referred to as "replacement").

When this replacement is performed, as shown by the solid line in FIG. 10, both the first gripping means 51 of the transport drum 21 and the second gripping means 52 of the transfer drum 24 grip the tip portion of the sheet material P ( Timing occurs.

In this case, the gap G between the first claw base 62 of the first gripping means 51 and the second claw base 64 of the second gripping means is constant. At this time, when the sheet material P is thin paper, the re-holding is performed in the state shown in FIG. 12 (a), and when the sheet material P is thick paper, the state is as shown in FIG. 12 (b). The cardboard is changed.

Then, in the present embodiment, as shown in FIG. 12, in the axial direction of the rotating member, the first claw stand 62 and the second claw stand 64 are between the two rotating members (passing cylinder 14 and the transport drum 21). The ends of the sheet material P are arranged so as to overlap each other when the sheet material P is delivered.

Therefore, when the sheet material P is delivered, the sheet material P is pressed between the ends of the first claw base 62 and the second claw base 64, so that the claws are held by the first claw portion 61 and the second claw portion 63. Fluttering is suppressed even when the feeding force is small.

As a result, fluttering of the sheet material P when the sheet material P is delivered is suppressed, stable delivery can be performed, and stable transportation can be performed.

Here, a comparative example will be described with reference to FIG. FIG. 13 is an explanatory diagram of a portion of the first gripping means and the second gripping means in the comparative example.

In this comparative example, in the axial direction of the rotating member, the first claw stand 62 and the second claw stand 64 end when the sheet material P is passed between the two rotating members (passing cylinder 14 and transport drum 21). The parts are arranged so that they do not overlap.

In this comparative example, when the sheet material P is thin paper, the re-holding is performed in the state shown in FIG. 13 (a), and when the sheet material P is thick paper, as shown in FIG. 13 (b). The cardboard is changed in the state

In the configuration of this comparative example, since the sheet material P cannot be pressed between the first claw base 62 and the second claw base 64 when the grip is changed, the first claw portion 61 and the second claw portion 63 are used. When the claw gripping force is small, the tip of the sheet material P tends to flutter. Therefore, the re-grabbing may not be performed smoothly, and stable transportation may not be possible.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 14 is an explanatory diagram of a portion of the first gripping means and the second gripping means in the same embodiment.

In the present embodiment, the transport drum 21 made of aluminum, resin, or the like is provided with the first claw stand 62 made of steel or the like. Similarly, a second claw stand 64 made of steel or the like is provided on the transfer cylinder 24 made of aluminum, resin or the like.

That is, the transport drum 21 that divides the first claw base 62 from the transport drum 21 and holds the first claw stand 62 that grips the sheet material P with the first claw portion 61 and the first claw stand 62. It is made of a material with higher strength and higher density.

Similarly, the second claw base 64 that divides the second claw base 64 from the transfer cylinder 24 and holds the sheet material P between the transfer cylinder 24 and the second claw portion 63, and the transfer cylinder that holds the second claw base 64. It is made of a material having higher strength and higher density than 24.

By dividing the first claw stand 62 and the second claw stand 64 from the transport drum 21 and the transfer drum 24 in this way, weight reduction can be achieved.

Next, the third embodiment of the present invention will be described with reference to FIG. FIG. 15 is an explanatory diagram of a portion of the first gripping means and the second gripping means in the same embodiment.

In the present embodiment, the cushioning materials 71 and 72 that can be reconstructably deformed are provided in the regions S where the first claw base 62 and the second claw base 64 overlap in the axial direction, respectively.

As a result, when the sheet material P is thick paper, damage to the sheet material P can be suppressed when the sheet material P is pressed by the first claw base 62 and the second claw base 64.

In the above embodiment, the rotary member is the transport drum 21 and the transfer drum 24, and the transfer drum 21 and the transfer drum 24 are described as an example in which the sheet material transport device is configured, but the present invention is not limited to this. do not have. For example, in the printing apparatus, the transfer cylinder 25 and the transfer drum 21 are each provided with gripping means to form a sheet material transfer device, and a rotating member (roller member or transfer belt) is arranged as a suction transfer mechanism unit 32. The same can be applied to a case where a sheet material transporting device for delivering the sheet material P from the delivery body 25 by changing the mouth is configured.

1 Printing equipment 10 Carry-in part 20 Printing part 21 Conveying drum (rotating member)
22 Liquid discharge unit 23 Discharge unit 24 Transfer cylinder (rotating member)
25 Delivery body (rotating member)
26 Suction device 51 1st gripping means 52 2nd gripping means 61 1st claw part 62 1st claw stand 63 2nd claw part 64 2nd claw stand

Claims (5)

At least two rotating members that support the sheet material, and
A first gripping means, which is arranged on one of the rotating members and includes a first claw portion and a first claw stand for gripping the tip portion of the sheet material,
A second gripping means, which is arranged on the other rotating member and grips the tip end portion of the sheet material, includes a second claw portion and a second claw stand.
In the axial direction of the rotating member, the first claw stand and the second claw stand are arranged so that their ends overlap each other when the sheet material is passed between the two rotating members. Sheet material transfer device. The sheet material transporting device according to claim 1, wherein the first claw portion or the second claw portion does not face the overlapping region of the first claw stand and the second claw stand. The sheet material transport according to claim 1 or 2, wherein the first claw base is made of a material having higher strength and higher density than the member holding the first claw base. Device. The second invention according to any one of claims 1 to 3, wherein the second claw base is made of a material having higher strength and higher density than the member holding the second claw base. Sheet material transfer device. A printing apparatus comprising the sheet material conveying apparatus according to any one of claims 1 to 4.

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