JPS62235149A - Sheet grip device - Google Patents

Abstract

PURPOSE:To make it possible to prevent grippers from being broken, in a printer or the like, by providing such an arrangement that support members urge the grippers toward the peripheral surface of a drum in a condition in which the operating range of the support members is limited by a stopper when one end of a sheet is gripped. CONSTITUTION:Resilient grippers 9, 10 for gripping one end of a sheet between themselves and the peripheral surface of a drum 5, are attached at their base ends to rigid support members 47, 49, and upon gripping, the support members 47, 49 are urged toward the peripheral surface of the drum 5 in a condition in which the operating range thereof is limited by stoppers 43, 45. Accordingly, by the resilient force of the grippers 9, 10, unbalancing of gripping forces due to misalignment of the grippers 9, 10 may be absorbed, and the engaging sections 59, 61 of the support members 47, 49 are received by the stoppers 43, 45 even if the grippers 9, 10 are made into press-contact with the outer peripheral surface of the drum 5 so that they are elastically deformed, thereby it is possible to prevent the grippers from being broken due to elastic deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sheet gripping device for gripping a sheet such as paper when wrapping the sheet around a drum of a printer, a copying machine, a facsimile, or the like.

[Conventional technology]

Conventionally, when wrapping a sheet around a photosensitive drum of a copying machine, for example, the edge of the sheet is gripped, and an apparatus for this purpose is disclosed in Japanese Utility Model Application No. 56-120546.

This device consists of a drum that wraps the sheet around its circumferential surface, and a drum that can be opened and closed on the drum circumferential surface, whose base end is pivotally connected to the drum, and whose free end is used to sandwich the leading end of the sheet between the drum circumferential surface. a gripper; and a pressing plate having a base end fixed to the drum, covering a pivoting portion of the sheet gripper, and having a free end for pressing the sheet gripper with self-elasticity to strengthen the gripping force of the leading end of the sheet. It is equipped with

[Problem that the invention seeks to solve]

However, in this device, positioning is difficult if there are multiple grips, and if even one is protruding, the other grippers cannot grip the sheet. Therefore, if the gripping force is increased, the gripper will be damaged.

[Purpose of the invention]

An object of the present invention is to obtain a sheet gripping device that prevents damage to the gripper.

[Means for solving problems]

Accordingly, the present invention provides a sheet gripping device that grips the edge of a sheet on the circumferential surface of a drum around which the sheet is wound. a support member to which a base end of the gripper is attached; a stopper that restricts the movement range of the support member; and when gripping the sheet end, the support member moves the gripper to the drum while the movement range is restricted by the stopper. and a biasing means for biasing the peripheral surface of the device.

[Effect]

That is, according to the present invention, the gripper that clamps the sheet end between the surface of the drum and the free end is made elastic, the base end of this gripper is attached to the support member, and when the sheet end is gripped, the support member Since the gripper is biased against the circumferential surface of the drum while its movement range is restricted by the stopper, even if the gripper is pressed against the drum and deforms elastically, the support member is stopped by the stopper and the gripper is can be prevented from being further elastically deformed and damaged.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

tIS1 shows a printing apparatus 1 using an inkjet recording method, in which a drum 5 is supported by a rotating shaft 7 and rotatably provided in a casing 3. The drum 5 is provided with a leading edge gripper 9 and a trailing edge gripper 10 formed of elastic leaf springs and the like. Paper devices 15 are sequentially arranged in the rotational direction of the drum 5. Incidentally, the tip gripper 9 is provided with an opening claw 63 as shown in FIG.

The paper feed tray 11 includes a sheet placement table 17, a pickup roller 19 that feeds out the sheet on the placement table 17, a sheet feed roller 21 (one-way row 2) that conveys the sheet fed out by the pickup roller 19, and this. A separating roller 23 is provided to prevent the sheet from being conveyed following the sheet sent out by the paper feed roller 21.

The suppression roller 12 is brought into pressure contact with the drum 5 only when the sheet is wound, and plays the role of strengthening the degree of adhesion while squeezing the sheet.

The recording device 13 includes an inkjet head 25 that ejects ink close to the surface of the drum 5, an idle wheel 27, and a screw shaft. #llll1114 and control device (
(not shown). 〃Idle shaft 27 and drive shaft 29
are both provided in parallel with the rotating drum 7 of the drum 5.

The inkjet head 25 is moved in the sub-scanning direction along the surface of the drum 5 by a drive shaft 29 rotated by a drive motor 31 .

The paper ejecting device 15 is installed so as to be able to come into contact with and separate from the drum 5, and includes a peeling lever 33 that peels the printed sheet from the surface of the drum 5, and a peeling lever 33 that peels the sheet peeled off from the surface of the drum 5 to the paper ejection table 35. It is provided with discharge rollers 37 and 39 for sending out the paper.

The drum 5 is provided with a gripper attachment part 41 as shown in FIG. 2, and stoppers 43, 45 are formed at the edges.

In this gripper mounting portion 41, N-shaped support members 47 and 49 that support the grippers 9 and 10 are attached to the pongee 51 and 53.
It is attached so that it can rotate around the center. These support members 47, 49 are provided with mounting portions 55.57 and locking portions 59, 61, and grippers 9, 10 are attached to the mounting portions 55, 57. The engaging portion 59.61 abuts against the stopper 43°45, and the supporting member 47.49
Regulates the rotation range of.

A friction member such as a rubber sheet is provided at the sheet grip position on the edge of the drum 5 so that it can sufficiently withstand the tension applied to the sheet by gripping it.

The tip gripper 9 is driven to three states: a grip preparation position, a grip position, and a release (peel #l) position, and its driving mechanism is constructed as shown in FIGS. 3 and 4.

First, an L-shaped drive lever 65 is attached to the pongee 51 of the support member 47. At one end of this drive lever 65 is a heavy! ! 67 is provided, and a drive bin 69 is provided at the other end. Therefore, centrifugal force acts on the weight 67 due to the rotation of the drum 5, and the drive lever 65 is rotated in the grip direction. The drive lever 65 is balanced by a weight 67 so that the force biased toward the grip by the spring is not weakened.

A drive cam 71 is also provided. This drive cam 71
is attached to the rotating shaft 7 of the drum 5 so as to be movable in the direction of the rotating shaft 7 (driven by a solenoid not shown). Note that the drive cam 71 does not rotate, so when opening the gripper 9, the drive cam 71 is moved in advance by turning on the solenoid, and is engaged with the drive lever 65 that rotates with the rotation of the drum 5 to reduce the rotational force of the drum 5. Open gripper 9 with .

When the gripper 9 is to be gripped, the drive cam 71 is moved (the solenoid current is turned OFF) to disengage the drive lever 65.

On the other hand, the driving mechanism of the a-end gripper 10 is constructed as shown in FIG.

Similar to the drive 1fl structure of the tip gripper 9, the support member 49
An L-shaped drive lever 73 is attached to the pongee 53. A weight @15 is provided at one end of this drive lever 73, and a drive bin 77 is provided at the other end.

Further, a cam lever 79 is attached to be rotatable about a shaft 81. This cam lever 79 is driven by a solenoid 83 in the diametrical direction of the drum 5.

Note that the elastic force of the grippers 9 and 10 is greater than the support member 47.4.
The biasing force of the gripper 47, 49 is increased, and even if a force that weakens the biasing force of the gripper 47, 49 due to centrifugal force or the like acts, the gripping force does not change.

With the above configuration, this device operates as follows.

As shown in FIG. 3, the sheet winding operation starts from the state where the drive lever 65 is stopped at the sheet discharge completion position (dotted chain line). At this time, the drive cam 71 moves in the direction of the rotating shaft 7 of the drum 5 due to its twist/idle and engages with the drive bin 69.

The drum 5 stops when the drive bottle 69 is pushed up by the drive cam 71 and reaches the grip position fi (solid line) at the tip, opening the glyph /<9.

With the tip gripper 9 at the broken line position as shown in FIG. 2, the sheet is sent out by the pickup row 719, the paper feed roller 21, and the separation roller 23. And the opened gripper 9 position r! When the sheet is fed up to 1, the sheet hits the locking portion 59, and the leading edge of the sheet is renosted. When the sheet is stopped by the gripper 9, the paper feed roller 21 and separation roller 23 stop, and then the solenoid is turned OFF! @The moving cam 71 moves in the direction of the rotating shaft 7 and disengages from the drive pin 69, completing the grip.

At this time, the gripper 9 is pressed against the drum 5 and is elastically deformed, and grips the sheet with this biasing force.

However, the locking portion 59 of the support member 47 is stopped by the stopper <43, thereby preventing further elastic deformation of the gripper 9.

After the leading edge of the sheet is gripped, the drum 5 starts rotating. At this time, the pressure roller 12 is located away from the outer circumference of the drum 5, and the paper feed roller 21 and separation roller 23 feed the paper to the grip position at the leading edge of the sheet and stop there, so the rotation of the drum 5 causes the sheet to be Pulled out separation row 2
23 functions as a brake to bring the sheet into close contact with the drum 5.

Immediately after the sheet leading edge grip position of the drum 5 passes, the pressing roller 12 is brought into pressure contact with the outer periphery of the drum 5 to bring the sheet into close contact with the drum 5.

During the unwinding and unwinding of the sheet onto the drum 5, when the drive pin 77 is in the rear grip position (dotted chain line), the cam lever 79 is driven by the solenoid 83 and pushes up the drive bin 77.

Next, the twist/id 83 turns OFF, and the pressure roller 12
Grip the f& end of the sheet that is in close contact with the drum 5. This completes the winding.

When the sheet is wound around the drum 5 in this manner, the drum 5 rotates in the direction of the arrow. Incidentally, at this time, the ink jet head 25 is also relatively moving in the main scanning direction. And, inkjet Herad 25,
According to the signal applied thereto, minute ink droplets are ejected toward the sheet surface to form a recorded image in a dot matrix.

When printing on the sheet is finished, the drive bin 69 is in front of the open position! ! ! (not shown), the drive cam 71 is moved in the direction of the rotating pongee 7 by the lever maid and engaged with the drive pin 69. The drive bin 69 is pushed up by the drive cam 71 to open the gripper 9 and the sheet is separated from the drum 5 by the release claw 63.

The leading edge of the sheet separated from the drum 5 is moved to the peeling lever 3
The drum 5 is separated by
When the paper reaches the circumferential speed of the drum 5, the paper is ejected at the same speed as the circumferential speed of the drum 5.

Furthermore, when the rear end gripper 10 is opened, the cam lever 79 operates at the same position as the grip, and the rear end of the sheet is separated from the circumferential surface of the drum 5 by its own stiffness and weight. From this point on, the ejection speed is increased to ensure that the paper is ejected onto the paper ejection tray 35.

According to this embodiment described above, the following effects can be obtained.

(1) The grippers 9t10 that hold the sheet end between the peripheral surface of the drum 5 and the free end are made elastic, and the base ends of these grippers 9.10 are attached to the rigid support member 47.49, and the sheet end is At grip 2, support member 47.49
Since the grippers 9 and 10 are biased against the circumferential surface of the drum 59 while the movement range is restricted by the stoppers 43 and 45, the elastic force of the grippers 9 and 10 prevents the grip force caused by unevenness of the plurality of grippers. In addition to absorbing the unbalance, the gripper 9.10 applies 1'l of pressure to the drum 5.
Even if the supporting member 47, 49 is elastically deformed by
9.61 is stopped by the stopper 43.45, and the gripper 9t10 can be prevented from being further elastically deformed and damaged.

(2) The support member 4 is stronger than the elastic force of the grippers 9 and 10.
Since the biasing force 7.49 is made sufficiently large, it is possible to prevent the gripping force from decreasing even if a force acts in a direction that weakens the biasing force of the grippers 47, 49 due to centrifugal force or the like.

[Modified example]

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and for example, the following modifications are possible.

(1) The stopper does not need to be provided at the edge of the drum; for example, it may be a pin provided within the drum.

(2) In the above embodiment, the gripper has elasticity, but an elastic body may be interposed between the gripper and the support member to make the gripper elastic.

(3) The support member may be an elastic body instead of a rigid body.

〔Effect of the invention〕

As explained above, according to the present invention, in a sheet gripping device that grips a sheet end on the peripheral surface of a drum around which a sheet is wound, elasticity that grips the sheet end between the peripheral surface of the drum and the free end is increased. a gripper, a support member to which a proximal end of the gripper is attached, a stopper for regulating the range of motion of the support member, and a state in which the range of motion of the support member is regulated by the stopper when gripping an edge of a sheet; Since a biasing means for biasing the gripper against the circumferential surface of the drum is provided, it is possible to obtain a sheet gripping device that prevents damage to the gripper.

[Brief explanation of drawings]

plS1 to FIG. 5 are diagrams showing one embodiment of the present invention, and each diagram represents the following. Fig. 1 is a new view showing the overall configuration of the printing vc device, Fig. 2 is a sectional view showing the structure of the gripper and support member, fjS3 and Fig. 4 are views showing the structure of the drive mechanism of the tip gripper,
FIG. 5 is a diagram showing the structure of the drive mechanism of the rear end gripper. DESCRIPTION OF SYMBOLS 1... Printing device 5... Drum 9... Leading edge gripper 10... Trailing edge gripper 11... Paper feeding device 12... Pressing roller 13... Recording device 1
5... Paper discharge device 43.44... Stopper 4
7.49... Support member 65... Drive lever
67... Weight 69... Drive bin 71...
Drive cam 73... Drive lever 75... Weight 77... Drive bin 79... Cam lever patent applicant Nippon Seimitsu Kogyo Co., Ltd. Figure 1

Claims (5)

[Claims] (1) A sheet gripping device that grips the edge of a sheet on the circumferential surface of a drum around which the sheet is wound, includes a gripper exhibiting elasticity that holds the sheet edge between the circumferential surface of the drum and the free end, and a a support member to which a base end is attached; a stopper that restricts the movement range of the support member; when gripping the sheet end, the support member moves the gripper around the drum while the movement range is restricted by the stopper; A seat grip device comprising a biasing means for biasing a surface. (2) The seat grip device according to claim 1, wherein the gripper itself has elasticity. (3) The seat grip device according to claim 1, wherein the gripper exhibits elasticity through an elastic body. (4) The seat grip device according to claim 1, wherein the urging force of the urging means is greater than the elastic force of the gripper. (5) The seat grip device according to claim 1, wherein the support member is a rigid body.