JPH0235709Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to paper conveyance rollers of copying machines, printing machines, and other various paper feeding devices, and in particular, the present invention relates to paper conveyance rollers for copying machines, printing machines, and other various paper feeding devices. This invention relates to a structure that allows swinging transition in a direction.

[Prior Art] Generally, when paper is transported in a copying machine, a printing machine, a collating device, etc., the paper is transported by pressing a transport roller into contact with the paper, but in order to control the transport timing, The transport roller is supported swingably and engages the paper only when necessary, and after the paper has been transferred by a predetermined amount, the roller is separated from the paper or the roller kicks out the trailing edge of the transported paper. Means such as oscillating transfer in the feeding direction are widely used.

For example, one that moves the transport roller toward and away from the paper is a pinch roller at the inlet that sends the paper to the main unit, and one that swings the transport roller in the feeding direction and touches the paper output roller at the paper exit. It is used as a roller to kick out any remaining edges.

As for its structure, a bracket is swingably extended from a rotating shaft connected to a drive system, a conveyance roller is attached to the tip of this bracket, and power is transmitted from the rotating shaft.

This bracket is connected to actuating means such as an electromagnetic solenoid to control its swing.

[Problem to be solved by the invention] For this reason, it is necessary to provide special actuation means such as an electromagnetic solenoid, as well as a conveyance roller,
If the bracket or the like is large and heavy, the operating means becomes large, the swing stroke of the conveyance roller is limited to the stroke of the operating means, and the structure becomes complicated.

In view of the above points, the present invention provides a very simple swing support structure for the transport roller that swings and transfers the transport roller in the paper transport direction or in the direction perpendicular to this, and the swing stroke can be freely set. Its main purpose is to provide a paper transport roller structure.

[Means for Achieving the Object] In order to achieve the above object, the present invention is characterized in that the base end of the bracket that supports the conveyance roller is supported on a drive shaft via a one-way clutch, and this drive shaft is Reversibly connected to an appropriate drive means, and
Power is transmitted from the drive shaft to the conveyance roller, and when the drive shaft rotates in the normal direction, the conveyance roller is rotated, and when the drive shaft rotates in the reverse direction, the conveyance roller is oscillated by a predetermined amount.

[Function] The forward rotation of the drive shaft rotates the conveyance roller. At this time, the one-way clutch and bracket are separated.

By reversing the drive shaft, the one-way clutch is brought into engagement with the bracket, and the bracket is swung through a required angle to move the conveyance roller a certain amount in a predetermined direction.

Therefore, the structure for moving the conveying roller in the direction away from the paper or in the direction of feeding the paper is extremely simple.

Further, the swing stroke of the conveyance roller can be freely set, and it is possible to reliably separate the conveyance roller from the paper and move it in the feeding direction over a long stroke.

[Example] First Example In Fig. 1 and Fig. 2, the illustrated one is paper 1.
The figure shows a paper feeding device that feeds paper (original documents) to the main unit A. A paper feeding tray 25, feed roller 6, and conveyance belt 7 are arranged as shown in the figure, and feeds paper (original documents) to the document set surface 8 of the copying machine A. The present invention will be described with respect to the case where paper is set to be fed from the table 25.

The paper 1 fed along the paper feed tray 25 is reversed by the feed roller 6 and the transport guide 18 and sent to the transport belt 7, which is disposed in sliding contact with the document setting surface 8. ing.

Therefore, a feed roller 6, a conveyance guide 18, a conveyance roller 2, and a gate stopper 9 are provided at the entrance of the paper 1 as follows.

First, the conveyance roller 2 and the feed roller 6 are in pressure contact with each other, and the roller 2 side is a driving roller and the roller 6 side is a driven roller (idle roller).
The conveyance roller 2 and the gate stopper 9 are designed to reciprocally appear and retract within the conveyance guide 18.

Referring to FIGS. 1, 2, and 3, the conveying roller 2 is a bracket whose base end is swingably supported on a drive shaft 5 supported by a machine frame 10 via a one-way clutch 4. 3, and power is transmitted from this drive shaft 5 through a chain 11.

The one-way clutch 4 is disengaged from the shaft 5 when the drive shaft 5 rotates the transport roller 2 in the transport direction, and engages the shaft 5 with the base end of the bracket 3 when the drive shaft 5 rotates in the opposite direction. It's like this.

Therefore, this drive shaft 5 is transmitted to a drive means consisting of a drive motor M via a worm gear 12 and a worm wheel 12', and the drive motor is a reversible motor.

Reference numeral 13 in the figure denotes a biasing spring that presses the conveyance roller 2 against the feed roller 6 side, which is not necessary when the conveyance roller 2 is biased toward the feed roller 6 side by its own weight.

Furthermore, the reason why the worm gear 12 is interposed between the drive motor M and the drive shaft 5 is that when the bracket 3 is separated from the feed roller 6 as shown in FIG. This is to prevent and lock the bracket 3 from moving in the direction in which the roller 2 comes into pressure contact with the feed roller 6.
This is because when the load torque of the drive system is large compared to the rotational torque of the bracket 3 in the moving direction, it is not necessary to employ such a worm gear, and the bracket 3 is equipped with an appropriate position holding means such as an electromagnetic locking device or a mechanical locking device. It may be provided.

Next, the gate stopper 9 will be explained.
By engaging the tongue piece 14 extending from the bracket 3 with the gate stopper 9 supported by a pin 15 as shown in the figure, the conveyance roller 2 and the stopper 9 are connected to the conveyance guide 1.
8 has come to appear reciprocally (first
(See Figure 2).

In FIG. 1, reference numeral 16 indicates a tension mechanism for the conveyor belt 7, and the conveyor belt 7
7a is connected to a drive system fixed to the machine frame 19, and the other outlet side pulley 17b is fixed to a pair of left and right adjustment plates 19A attached to the machine frame 19 so as to be slidable in the tension direction. The adjustment plate 19A is pulled in the tension direction by a biasing spring 20.

By adjusting the tension of the pulleys of the conveyor belt 7 using the pair of left and right biasing springs 20 in this way, there is no risk that the belt 7 will meander and come off during travel.

In this structure, a sheet of paper is inserted from the sheet feed table 25 and aligned by abutting the leading end of the sheet against the gate stopper 9 (see FIG. 1).

Next, when the drive shaft motor M is activated by a paper feed instruction signal from the main unit A and the drive shaft 5 is rotated clockwise in FIG. 2, the conveyance roller 2 is rotated by the chain 11 in the feeding direction. As the drive shaft 5 rotates in this direction, the shaft 5 and the one-way clutch 4 at the base end of the bracket 3 are separated, and the bracket 3 is pressed against the feed roller 6 by the biasing spring 13, and the paper 1 is moved toward the belt 7 side. send to.

When the predetermined conveyance of the paper is completed, the drive motor M is instantaneously reversed. Then, by rotation in this direction, the drive shaft 5 and the one-way clutch 4 at the base end of the bracket 3 engage with each other, and the bracket 3 swings from the state shown in FIG. 2 to the state shown in FIG. 1 against the biasing spring 13. The transport roller 2 moves to a position away from the feed roller 6.

After the bracket 3 is oscillated by a predetermined angle by the reverse rotation of the drive motor M, when the drive motor M is stopped, the bracket 3 is supported by the worm gear 12 and held and locked in that position.

Furthermore, if it is necessary to prevent the conveyance roller 2 from rotating in the opposite direction to the feeding direction when the drive shaft 5 reverses, a one-way clutch may be built into the transmission system from the drive shaft 5 to the conveyance roller 2. Bye.

Second Embodiment Figure 4 shows a case where the present invention is adopted as a paper discharge roller.When paper is discharged by a pair of pressure rollers, after the trailing edge of the paper passes the pressure contact point of the rollers, the conveying force is may not be applied, and the trailing end may remain on the roller and not be carried out reliably.

In such a case, by moving the ejection roller along the paper ejection direction, the paper is kicked out and reliably stored in the stacker.

In FIG. 4, 26 is a paper discharge stacker, 27 is a feed roller (idle roller), and the paper sent from main unit A is transferred to the feed roller 2.
The present invention will be described with respect to the case where the sheet is discharged to the discharge stacker 26 using the paper sheet 7 and the conveyance roller 2.

A conveyance roller 2 is supported by a bracket 3 at a position opposite to a feed-out roller 27 supported on a machine frame 28, and this bracket 3 is attached to a drive shaft 5 so as to be swingable in the sheet conveyance direction. They are connected via a one-way clutch 4 similar to the one shown in FIG. The drive shaft 5 and the conveying roller 2 are driven by a belt or the like (not shown).

30 is a spring that tensions and biases the bracket 3 into the state shown in FIG. 4A.

A drive motor (not shown) is connected to the drive shaft 5 in the same manner as described above.

Therefore, the drive motor is rotated in the state shown in FIG. 4A to transport the paper between the transport roller 2 and the feed roller 27.

The drive motor is reversed at the stage when conveyance of the paper is completed. Then, the one-way clutch 4 engages the drive shaft 5 and the base end of the bracket 3, and the bracket 3
swings as shown in FIG.

The one shown in Fig. 4 does not use a worm gear in the drive system of the drive shaft 5, and when the drive motor stops, the bracket 3 is returned from the position A in Fig. 4 to the position A in the same figure by means of a spring 30. be.

Furthermore, if it is necessary to prevent the transport roller 2 from rotating in the opposite direction to the feeding direction when the drive shaft 5 reverses, a one-way clutch may be built into the transmission system from the drive shaft 5 to the transport roller 2. Bye.

[Effects of the invention] The present invention has the above-mentioned configuration, in which the bracket 3 to which the transport roller 2 is attached is supported on the drive shaft 5 via the one-way clutch 4, and the drive shaft 5 is controlled in forward and reverse directions to perform transport. While rotating the roller 4 by transmission,
Since the bracket 3 is swung at a required angle to move the conveying roller 4 by a certain amount in a predetermined direction,
The structure for moving the conveying roller 4 in the direction away from the paper or in the direction of feeding the paper is extremely simple.

In particular, compared to conventional systems in which the conveyance roller is moved using an electromagnetic solenoid, the swing stroke of the conveyance roller 2 can be freely set, and separation from the paper is ensured.
Movements in the feeding direction are also possible over long strokes.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention; FIG. 1 is an overall explanatory diagram, FIG. 2 is an explanatory diagram of the operating state, FIG. 3 A and B are explanatory diagrams of the drive transmission mechanism, and FIG. is an explanatory diagram of an embodiment different from that in the previous figure;
The same figure is an explanatory diagram of its operating state. M...driving means, 2...transport roller, 3...bracket, 4...one-way clutch, 5...drive shaft.

Claims (1)

[Scope of utility model registration request] In a paper conveyance roller structure in which a conveyance roller for conveying paper connected to an appropriate driving means is attached to a swingable bracket and the conveyance roller is moved a predetermined amount in a direction towards and away from the paper on a conveyance path or in a direction in which it is fed, The base end of the bracket supporting the conveyance roller is supported on a drive shaft via a one-way clutch, and this drive shaft is connected to an appropriate drive means so as to be able to rotate forward and reverse, and transmission is transmitted from the drive shaft to the conveyance roller. The paper conveyance roller structure has a paper conveyance roller structure in which the forward rotation of this drive shaft rotates the conveyance roller, and the reverse rotation causes the conveyance roller to swing and move by a predetermined amount.