JPS62104367A - Sheet winding device for cylindrical drum - Google Patents

Abstract

PURPOSE:To clamp a sheet stably by opening and closing a clamp part by a cam mechanism composed of a cam lever and a stop lever which are pivoted rotatably on the outside of the outer peripheral part of a drum. CONSTITUTION:When a set solenoid 23 is operated, the tip part of the cam lever 21 comes close to the drum 11. When the drum 11 is rotated, the roll 15 of a pawl holding member 13 engages a cam surface 21b formed at the lower end of the cam lever 21 to rotate the pawl holding member 13 and a claw 14 leaves the outer peripheral surface of the drum 1, thereby opening a clamp part. When the clamp part is opened, a sheet is conveyed, the front end part is inserted into the clamp part, and a disengagement solenoid 34 is powered on to return the cam lever 21 to its original stand-by position.

Description

Detailed Description of the Invention [Technical Field] Sheet winding of a cylindrical drum for reading and recording by winding a sheet-like object such as a manuscript or recording paper around a cylindrical drum in a facsimile, printer, copying machine, or printing machine. The attached items relate to the equipment.

BACKGROUND TECHNOLOGY Conventionally, facsimiles, printers, copying machines, and printing machines have been widely used to read and record information by wrapping a sheet-like material such as a manuscript or recording paper around a cylindrical drum.
Are known.

Apparatuses for winding the sheet around the cylindrical drum include a claw clamp method, an air suction method, an electrostatic adsorption method, and an adhesive bonding method, but the claw clamp method is popular from the viewpoint of cost and technical design.

This conventional claw clamp type cylindrical drum is disclosed in Japanese Unexamined Patent Publication No. 102622/1983, 4! Kaisho 59-1359
There are those described in Japanese Patent Application Laid-open No. 68 or Japanese Patent Application Laid-open No. 134980/1983.

The one described in Japanese Patent Application Laid-Open No. 53-102622 is
As shown in the figure, as the drum l rotates, the pawl 2 moves to the cam 3.
However, since the cam 3 is attached to the shaft 4 of the drum, when the claw 2 is closed, a reversal force is applied to the rotation of the drum, and the claw 2 is only gradually tightened. Therefore, after the leading edge of the sheet is gripped by the claw 2, if the sheet does not move together with the claw 2, the leading edge of the sheet may come off the claw 2 and cannot be clamped, making it difficult to grasp the sheet. It was of a low degree.

Also, JP-A-59-134980 and JP-A-59
In the device described in Japanese Patent No. 134980, a cam 5 is provided at the tip of the link 4, and the pawl 7 is opened and closed by the movement of the solenoid 6, as shown in FIG. 1O. When the cam 5 is set and the support part of the pawl 7 rides on the cam 5 to open the pawl 7, a direct force is applied to the solenoid 6, so it is necessary to increase the power of the solenoid 6. A system in which the pawl 7 is opened and closed directly by the solenoid 6 has also been disclosed, but this also requires a large solenoid blower.

Furthermore, in the device disclosed in JP-A-59-134980, the links and cams are arranged closer to the drum shaft than the opening/closing members of the claws, so the sizes of the links and cams are restricted. .

It had the disadvantage of being difficult to layout.

Purpose This invention was made in order to eliminate the drawbacks of the conventional sheet winding device on a cylindrical drum as described above. The object of the present invention is to provide a sheet winding device that requires less power for clamping and is easy to layout.

Structure This invention was made to achieve the above object, and includes a cylindrical drum.

The cylindrical drum is rotatably supported on the outer periphery of the drum about an axis parallel to the rotational axis of the drum, and has a sheet clamping pawl at one end. A claw holding member is biased in the direction of pressure contact, and a claw holding member is rotatably supported at an outer position on the outer periphery of the cylindrical drum about an axis parallel to the rotational axis of the drum, and is attached to the side edge of the drum side. A cam lever is formed with a cam surface and this cam surface is biased in a direction away from the drum, and is connected to the cam lever.

A first solenoid that rotates the cam lever in a direction in which its cam surface approaches the cylindrical drum; and an engaging portion that is rotatably supported in the same plane as the cam lever and that locks the tip of the cam lever at the end thereof. A stopper lever is formed, is biased in the direction of the cam lever 9-, and has the tip of the cam lever in contact with the side thereof, and is connected to this stopper lever to rotate the stop lever 9 in a direction away from the cam lever. When the first solenoid is turned on, the cam lever is rotated and the tip of the cam lever is turned on. - At the same time, a part of the pawl holding member engages with the cam surface of the cam lever and moves along the cam surface as the drum rotates, so that the pawl holding member is When the pawl is rotated in the opposite direction to the biasing direction and the pawl is separated from the outer circumferential surface of the drum, and the first solenoid is turned off and the second solenoid is turned on, the strut horn renomer rotates in the opposite direction to the biasing direction. When the engaging portion disengages from the tip of the cam lever and the cam lever returns to its original position, the cam surface separates from a part of the pawl holding member, and the pawl holding member returns to its original position. This feature is characterized in that the claws are brought into pressure contact with the outer peripheral surface of the drum.

The present invention will be explained in more detail below based on embodiments shown in the drawings.

In FIGS. 1 and 2, a pawl holding member 13 is attached to the outer circumferential portion of the drum 11 so as to be rotatable about a shaft 12 parallel to the rotation axis of the drum 11. As shown in FIG. 3, this pawl holding member 13 has a plurality of elastic plate-shaped pawls 14 arranged in parallel with the shaft 12 on the tip edge thereof, and these pawls 14 allow the outer circumferential surface of the drum 11 to be The leading end of the sheet is clamped between the two. Further, a roller 15 is rotatably attached to the rear end side of the claw holding member 13.

This pawl holding member 13 is rotatably supported on the outer circumference of the drum 11 by a shaft 12, and the pawl 14 is pressed against the outer circumferential surface of the drum 11 by a spring 16 interposed between the pawl holding member 13 and the drum 11. biased in the direction. Incidentally, the drum 11 is provided with a stone and an e1 f to prevent the claw 14 from being pressed against the outer peripheral surface of the drum more than necessary.

A substantially arc-shaped cam lever 21 is rotatably supported on the side of the drum 11 about a shaft 22, and at the rear end of the cam lever 21.

Set solenoid 23 is installed.

The cam lever 21 is rotated in a direction in which its tip approaches the drum 11.

The cam lever 21 is biased in a direction in which the tip is moved away from the drum 11 by a return spring 24 attached to the tip, and remains stationary while being engaged with the arm of the arm 25.

A stopper lever 31 is rotatably attached to the front end of the cam lever 21 about a shaft 32, and the lower end is pressed against the end of the cam lever 21 by a pressing spring 33 attached to the upper end. biased in the direction.

A release solenoid 34 is attached to the upper end of the stopper lever 31, and its operation causes the stopper lever 31 to rotate in a direction opposite to the biasing force of the spring 33. There is. In addition, numeral 35 in the figure is a stone A that restricts the rotation of the strut drooper 31.

In the above device, when the set solenoid 23 is activated from the state shown in FIG. Ru. And Kamure/etc.
Is the tip of 21 21m long? -31 and descends while sliding along the sides of the stopper 31, and as shown in FIG.

The state shown in Figure 3 is Kamure/? -21 is set, and when the drum 11 is rotated in the direction of arrow B in the figure in this set state, the roller 1 of the claw holding member 13
4 and the cam [21b formed on the lower edge of the cam lever 21] engage, and as the drum 110 rotates, the roller 15 is urged against the cam surface 21b, and the pawl holding member 13 rotates in the direction of arrow C. be done. As a result, the claws 14 are separated from the outer peripheral surface of the drum 11, and the clamp portion is opened.

Note that the force generated when the roller 4 rides on the cam surface 21b is applied to the shafts 22 and 32 via the cam lever 21, respectively.

When the clamp section is opened, the sheet is fed by a paper feeding device (not shown), and the leading end of the sheet is inserted into the clamp section 1 (2277). Stop rotating or turn drum 1
1 while rotating, energize the removal solenoid 34 at the right timing.

Then, the stopper lever 31 is rotated in the direction of the arrow against the pushing spring 33, and the tip 21 of the cam lever 21 is rotated in the direction of the arrow.
m,! : Since the engagement of the engagement portion 31m of the stop soleper 31 is released, the cam lever 21 is released from the return spring 2.
4, it rotates until it engages with the stopper 25, and returns to its original standby position.

By this return of the cam lever 21, the engagement between the cam surface 21b and the roller 15 is released, and thereby the pawl holding member 1
3 returns to its original position, the clamp portion is closed, and the leading end of the sheet is clamped. At this time, release solenoid 34
It is sufficient that the energization is carried out only during the time period during which the cam lever 21 and the stopper lever 33 are disengaged.

In the above description, the drum 11 may rotate in either direction, but it is more effective if the cam lever 21 VCMJb force acts freely.

Although the above explanation is for clamping a sheet, the same operation is performed when discharging a sheet. That is, as shown in FIG. 5, the cam lever 21 is set,
When the drum 11 is rotated in the B direction, the T215 provided on the claw 14 and the cam surface 21a of the cam lenome 21 engage with each other, and the clamp portion is opened as the drum 11 rotates.

Then, the sheet is pulled out from the clamp section by a sheet conveyance device (not shown), and then the cam lever 21 is returned to its original position in the same manner as when the sheet was clamped, and the drum 1
1 in the E direction to send out the sheet to the paper ejection path.

In the above, when the sheet is clamped and discharged outside the plate, the rollers 15 of the claw holding member 13 and the cam surface 21b
, 21c do not engage with each other.

FIG. 6 shows the arrangement of the drum 11, paper feed cassette 41, and stacker 42. In FIG. 6, the paper feeder 41 is arranged at the lower stage, the stacker 42 is arranged at the upper stage, and the sheet clamp position α and sheet discharge position β
are placed adjacent to each other. When clamping a sheet, the drum 11 is rotated in the F direction to clamp the leading and trailing ends of the sheet at position α, and when discharging the sheet,
The drum 11 is rotated in the G direction.

This is possible when the paper feed cassette 41 is arranged in the upper stage and the stacker 42 is arranged in the lower stage as in the conventional case 5 shown in FIG. 41, the clamping position and the ejecting position are in opposite directions, so two cam mechanisms are required for clamping and ejecting the sheet, but the sheet winding device of the present application As shown in Fig. 1, the sheet is clamped and ejected by the cam mechanism 5 -, so the sheet clamp position α and the sheet ejection position are set at 5 as shown in Fig. 6. β can be placed adjacent to the cam mechanism.This arrangement improves maintenance to prevent jams, allows for easy-to-use front operation, and simplifies the cam mechanism. This makes it possible to

Effects As described above, the sheet winding device according to the present invention has a cam surface, and uses a cam mechanism consisting of a cam lever and a stopper lever, which are rotatably supported on the outside of the outer periphery of the drum, to wind the clamp part. By opening and closing, the seat can be clamped stably, and it has the excellent effect of requiring less power to clamp the seat and being easy to layout. be.

[Brief explanation of drawings]

Fig. 1 is a side view showing one embodiment of the present invention, Fig. 2 is a plan view of the same embodiment, Fig. 3 is a perspective view showing a claw holding member in the same embodiment, and Figs. 4 and 5 are the same embodiment. FIG. 6 is a layout diagram showing the arrangement of the cylindrical drum, stacker, and paper feed cassette in the present invention; FIGS. 7 and 8 are conventional layout diagrams; FIGS. 9 and 10 are FIG. 2 is a side view showing a conventional sheet winding device. 11... Cylindrical drum 12... Shaft 13... Claw holding member 14... Claw 15... Roller
16..., Sufring 21...Cam lever 2
2...Shaft 23...Set solenoid 24...
・Return spring 31...stopper lever 3
2...Shaft 33...Press spring 34...Removal solenoid Patent applicant Rico Co., Ltd.

Claims (1)

[Claims] 1. A cylindrical drum, which is rotatably supported on the outer periphery of the cylindrical drum about an axis parallel to the rotational axis of the drum, and has a sheet clamping claw at one end. , a claw holding member which is biased in a direction in which the claw and the outer peripheral surface of the cylindrical drum are pressed against each other; A cam lever that is freely pivoted and has a cam surface formed on the side edge on the drum side and is biased in a direction away from the drum; The first solenoid is rotatably supported in the same plane as the cam lever, and has an engaging portion formed at its end to lock the tip of the cam lever, and is attached in the direction of the cam lever. a stopper lever, the end of the cam lever being in contact with the side of the stopper lever; and a second solenoid connected to the stopper lever to rotate the stopper lever in a direction away from the cam lever; When the cam lever is turned on, the cam lever is rotated and its tip is locked with the engaging part of the stopper lever, and a part of the pawl holding member engages with the cam surface of the cam lever, and as the drum rotates, the cam is rotated. By moving along the surface, the pawl holding member rotates in the opposite direction to the urging direction, and the pawl is separated from the outer peripheral surface of the drum, and when the first solenoid is turned off and the second solenoid is turned on, The stopper lever rotates in the opposite direction to the biasing direction, the engagement portion of the stopper lever disengages from the tip of the cam lever, and the cam lever returns to its original position, causing the cam surface to become a part of the pawl holding member. 1. A sheet winding device for a cylindrical drum, characterized in that the claws are brought into pressure contact with the outer peripheral surface of the drum by separating the claws from the drum and returning the claw holding members to their original positions. 2. Two cam surfaces are formed on the cam lever, and two adjacent cam surfaces are formed.
2. The sheet winding device for a cylindrical drum according to claim 1, wherein the claws are opened and closed at certain locations.