JPH0735749Y2 - Roll paper cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a roll paper cutter of an image forming apparatus such as a copying machine, a facsimile, and a printer.

[Prior art]

In an image forming apparatus such as a copying machine, a continuous paper fed from a roll paper has a predetermined size, for example, a cutter having a fixed blade and a movable blade in a designated size such as A4 size, B4 size, and B5 size. Cutting is already known.

When a new roll paper is loaded or after paper jam processing, etc., the movable blade is normally manually moved to clean and align the leading edge of the roll paper, and the cut paper piece at that time is stored in the scrap receiver. To be done. The operator should take out the scraps of paper from the scrap receiver and discard them.

When a person puts his / her hand on the scrap receiver and takes out a piece of paper, a person's hand touches the edge of the fixed blade or the movable blade, which causes injury. In order to prevent this danger, the blade edges are all designed to be located below the waste catch. However, in order to cut the paper, the movable blade moves above the fixed blade and does not move to a position higher than the scrap receiver, so that the paper piece is not accommodated in the scrap receiver. Even if the movable blade moves above the scrap receiver, there is no danger if it returns below the scrap receiver after cutting.

The movable blade is designed to return to below the scrap receiver after cutting, but if the operator opens the cover when the movable blade cannot be returned to its original position for some reason, the movable blade Since the blade edge is located near the cover and it is in a position where it can be easily touched, there is no danger.

[Problems to be solved by the device]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above conventional problems and to provide a roll paper cutter that is free from the risk of injury due to the edge of the movable blade.

[Means for Solving the Problems]

The present invention solves the above problems in a roll paper cutter having a fixed blade, a movable blade, a means for moving the movable blade, a scrap receiver for storing cut paper pieces, and a cover for covering the scrap receiver, A push plate movable integrally with the movable blade and a means provided on the cover for pushing down the push plate when the cover is opened, the push plate is pushed down when the cover is opened, and the movable blade is pushed downward from the scrap receiver. This was solved by a roll paper cutter characterized by the above.

[Action]

According to the present invention, the movable blade is driven by a motor or is moved by a manual lever to apply a shearing force to the paper with the fixed blade to cut the paper. The paper cut into a predetermined length is conveyed to the next step, and a short piece of paper to be a chip is put in the scrap receiver.

When the operator opens the cover, only the cover is opened under normal conditions, but when the movable blade is still raised, the cover pushes down the push plate, and the push plate is pushed down to force the movable blade to catch the waste. It is rotated downward. Therefore, after opening the cover, even if you put your hand in it, the movable blade is lower than the scrap tray, and there is no danger of touching it.

〔Example〕

 The details of the present invention will be described based on an embodiment shown in the drawings.

In FIG. 1, the paper 1 pulled out from a roll (not shown) is sent to a cutter 3 by a feed roll pair 2.

The cutter 3 has a fixed blade 5 fixed to the machine frame 4 and a movable blade 6 which is rotatable.

The movable blade 6 is a carrier 8 rotatably supported by a support shaft 7.
Fixed to. The movable blade 6 cuts the paper 1 by the shearing action between the movable blade 6 and the fixed blade 5 when the movable blade 6 rotates from the lower side to the upper side in the drawing.

A lever 9 which is fixed directly to the carrier 8 or fixed via a support shaft 7 and rotates integrally with the carrier 8 around the central axis of the support shaft 7 is provided. The lever 9 is an output shaft 11 of the motor 10.
It is rotated by a crank lever 12 fixed to. A crank pin 13 is fixed to the crank lever 12, and a roller 14 is rotatably supported on the crank pin 13. The lever 9 is formed with an abutting surface 15 on which the roller 14 abuts.

When the crank lever 12 rotates once by driving the motor 10, the lever 9 is pushed by the roller 14 and the lever 9 swings back and forth once. A spring 16 mounted around the support shaft 7 is engaged with the lever 9, and the lever 16 constantly applies a force for returning the lever 9 to the standby position shown in FIG. The contact surface 15 of the lever 9 is held in contact with the roller 14 supported by the crank pin 13 by the force of the spring 16.

When the paper is automatically fed, it can be cut into a predetermined length by driving the motor 10 at a predetermined timing. For example, A4 size, B5 size, B4 size, etc. can be cut to a specified length.

Generally, to clean the leading edge of the roll paper when the roll paper is newly installed, or when the roll paper is restarted due to paper jam processing during paper feeding, or to determine the paper size in some cases. It is necessary to cut manually also for the reference alignment of the front edge. For this purpose, a manual lever 18 is provided, which is rotatably supported by a shaft 17. A means for facilitating the operation of the manual lever 18 such as a grip 19 is provided at one end of the manual lever 18, and a roller 20 for contacting the lever 9 is provided at the other end.
Is rotatably supported by a pin 21. The manual lever 18 is provided with a return spring 22 so that it is automatically returned to the standby position where it comes into contact with the stopper 23 when the force applied by the hand is removed. As shown in FIGS. 1 and 2, the lever 9 is formed with a manual contact surface 24 against which the roller 20 of the manual lever 18 abuts, in addition to the contact surface 15 against which the roller 14 of the crank lever 12 abuts.

When the handgrip 19 of the manual lever 18 is pushed down as shown in FIG. 3, the manual lever 18 rotates counterclockwise in the figure, and the roller 20 pushes the manual contact surface 24 and resists the force of the spring 16. Rotate 19 clockwise. By the rotation of the lever 19, the movable blade 6 moves relative to the fixed blade 5, cuts the paper 1, and is moved to the upper end position shown in FIG. At this time, since the motor 10 is not driven, the crank lever 12 is maintained in the standby position.

Therefore, the roller 20 and the manual abutment surface 24 on which the roller 20 abuts are the crank lever 12 and the roller when the lever 9 rotates.
As shown in FIG. 2, it is formed at a position displaced from the contact surface 15 to the left and right in the figure so that the 14 does not contact.

By pushing the manual lever 18, the lever 9 is moved, the movable blade 6 is moved, and the paper piece cut by the cooperation with the fixed blade 5 is accommodated in the scrap receiver 25 formed on the machine frame 4. The upper part of the scrap receiver 25 is shielded from the outside by a cover 26. Cover 26 is shaft 27
It is supported so that it can be opened and closed.

The movable blade 6 which is rotated by the manual lever 18 or the crank lever 12 to cut the paper sheet is returned by the action of the spring 16 according to the rotation of the manual lever 18 or the crank lever 12.

However, it is not always the case that the movable blade 6 does not return. When the movable blade 6 does not return in this way, the blade tip is above the scrap receiver 25. In this state, when a person raises the handle 28 of the cover 26 to open it and tries to take out a piece of paper from the scrap receiver 25, the hand hits the movable blade 6 and is injured. In order to prevent this, the push plate 29 is fixed to the carrier 8 supporting the movable blade 6 directly or via the support shaft 7. When the movable blade 6 is raised, the push plate 29 is covered by the cover 28 as shown in FIG.
It is located near. A protrusion 30 is formed on the cover 28 to push down the push plate 29 when the cover 28 is opened. Push plate 29 and protrusion 30
Is sufficient to push down the movable blade 6. Therefore, it is sufficient that the push plate 29 and the protruding portion 30 are formed only on one side or both sides in the extending direction of the movable blade 6.

When the cover 28 is opened while the movable blade 6 is on the upper side, as shown in FIG. 5, the protrusion 30 provided on the cover 28 abuts against the push plate 29 and pushes down the push plate 29. By pushing down the push plate 29, the carrier 8 is pushed down and the movable blade 6 is pushed down. Push plate 29
The movable blade 6 is pushed downward from the bottom surface of the waste catch 25 when it is pushed down until it comes into contact with a part of the bottom surface of the waste catch 25. The risk of touching is avoided.

Manual lever when newly loading roll paper or after clearing paper jams
The leading edge of the paper 1 is cut by 18 and the leading edge is cut and aligned as a clean edge, and at the same time, the leading edge is positioned at a predetermined position. After that, the paper 1 is fed by the feed roller pair 2 and the like,
Stops when a predetermined length such as A4 size is sent,
The motor 10 is driven and the paper 1 is cut by the movable blade 6 and the fixed blade 5. As a result, the paper of a predetermined size is cut, the cut paper is sent to the next step, and the succeeding paper is sent again by a predetermined length and cut. The paper is cut into a predetermined size automatically by repeating the following steps.

〔effect〕

According to the present invention, it is possible to prevent an injury caused by a hand touching the edge of a cutter when a piece of paper is taken out.

[Brief description of drawings]

1 is a schematic explanatory view of a cutter according to the present invention, FIG. 2 is a right side view of a lever for rotating a movable blade in FIG. 1, and FIG.
FIG. 4 is a schematic explanatory view of the cutter showing a state after cutting, FIG. 4 is a plan view of the cutter, and FIG. 5 is an explanatory view when the cover of the cutter is opened. 1 ... paper, 3 ... cutter 5 ... fixed blade, 6 ... movable blade 9 ... lever (means for moving movable blade) 10 ... motor (means for moving movable blade) 12 ... crank lever (means for moving movable blade) 18 ... manual Lever (means for moving the movable blade) 25 ... Waste receiver 26 ... Cover 29 ... Push plate 30 ... Projection

Claims (1)

[Scope of utility model registration request] 1. A roll paper cutter having a fixed blade, a movable blade, a means for moving the movable blade, a scrap receiver for accommodating cut paper pieces, and a cover for covering the scrap receiver. A pressing plate that is movable as a unit, and a means that is provided on the cover and that pushes down the pressing plate when the cover is opened, the pressing plate is pushed down when the cover is opened, and the movable blade is pushed down below the scrap receiver. A roll paper cutter.