JPH0967041A - Medium conveying mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify structure by rotatably supporting a roller arm for supporting a press roller, by a supporting shaft, providing an energizing means between the supporting shaft and the roller arm, and rotating the supporting shaft to open/close a nip part of a feed roller and the pressure roller. SOLUTION: The upper part of a driven body 23 of inverted T-shape is provided with a guide roller driven being engaged with a cam groove 22a of a cam 22, and oblong holes 25, 26 with the longitudinal direction extended vertically are formed at the upper and lower parts of the driven body 23. Guide pins 27, 28 fixed to the case side are respectively engaged with the oblong holes 25, 26. The lower part of the driven body 23 is provided with oblong holes 29, 30 with the longitudinal direction extended laterally, and connecting pins 33, 34 provided at the end parts of link levers 31, 32 are engaged with the oblong holes 29, 30. The driven body 23 is vertically moved by the rotation of the cam 22 driven by a motor so as to oscillate the link levers 31, 32 and roller arms 37, 38 vertically around supporting shafts 35, 36, thus bringing a press roller 2 in each carrier roller 3 into contact with a feed roller 1 and separating the press roller 2 from the feed roller 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium carrying mechanism for carrying a medium by a feed roller and a pressing roller.

[0002]

2. Description of the Related Art A medium processing apparatus which takes in a medium and performs reading / writing and printing of data has a medium conveying mechanism for conveying the medium. As such a medium transport mechanism, there is one that can release the supply of the transport force to the medium in order to perform a predetermined process on the medium, for example, a width-shifting operation. FIG. 6 is a front view showing a main part of a medium carrying mechanism having such a width-shifting function, FIG. 7 is a perspective view of FIG. 6 seen from below, and FIG. It is a side view seen from the view A direction.

The feed roller 1 fixed to the drive shaft 1a and rotating in the forward and reverse directions sandwiches the medium P together with the pressing roller 2 provided opposite thereto and conveys the medium P in the arrow direction along the upper and lower conveyance guides G1 and G2. The transport roller 3 is configured.
The pressing roller 2 is rotatably supported by the supporting member 4, and the elasticity of the supporting member 4 causes the feeding roller 1 to rotate.
Is biased in the direction of. The outer peripheral surface of the pressing roller 2 slightly protrudes from the opening of the conveyance guide G2 on the lower surface, and the medium P
It is designed to come into contact with and be pressed against.

The supporting member 4 for rotatably supporting the pressing roller 2 shown in FIG. 7 is made of a material having an appropriate elasticity. The two support members 4 are fixed to both ends of the rigid connecting plate 5. 2 of connecting plate 5
A guide portion 6 is provided at the location, and the connecting plate 5 is
Two guide pins 7 vertically provided on a conveyance guide G2 penetrating the guide portion 6 are guided to move up and down.

The elevating arm 8 is rotatably supported by a bearing portion 9 provided vertically on the transport guide G2, and the connecting plate 5 is attached to the end portion 8a of the elevating arm 8 which is bent and formed in a U shape. It is pivotally attached to the bearing portion 10 formed in the central portion.

When the elevating arm 8 is rotated by a driving means (not shown), the connecting plate 5 is guided by the guide pins 7 and ascends and descends. As the connecting plate 5 moves up and down, the outer peripheral surface of the pressing roller 2 supported by the supporting member 4 appears and disappears from the opening of the conveyance guide G2 on the conveyance path surface. When the connecting plate 5 rises, the medium P is nipped by the outer peripheral surface of the pressing roller 2 and the feed roller 1. At that time, the pressing roller 2
Are urged by the elastic force of the support member 4 in a direction of pressing the feed roller 1.

The width-adjusting roller 11 shown only in FIG. 8 is supported by a supporting member 12 so as to be rotatable about an axis parallel to the transport direction of the medium P. The support member 12 is rotatably supported with a support shaft 13 parallel to the support shaft of the width-shifting roller 11 as a fulcrum. The operation pin 14 is inserted into a hole provided at the lower end of the support member 12. Operating pin 1
By moving 4 to the position shown by the solid line and the chain double-dashed line, the support member 12 rotates about the support shaft 13 as a fulcrum.

Therefore, when the operating pin 14 is in the upper portion as shown by the solid line, the width-adjusting roller 11 is in contact with the feed roller 1 by the supporting member 12.
At this time, the outer peripheral edge of the width-shifting roller 11 comes into contact with the outer peripheral edge of the rotating feed roller 1, whereby the width-shifting roller 11 is driven to rotate in the arrow direction. Therefore, the width-shifting roller 11 comes into contact with the medium P to move the medium P to the reference guide H.
It is made to collide with and the width-shifting operation is performed. At this time, in order to move the medium P smoothly, the elevating arm 8 is rotated to retract the outer peripheral surface of the pressing roller 2 downward from the guide surface position of the transport guide G2, and the feed roller 1 and the pressing roller are pressed. By separating the roller 2 from the medium P, the carrying force applied to the medium P is released.

On the other hand, when the operating pin 14 is at the lower portion as shown by the chain double-dashed line, the width-adjusting roller 5 is separated from the feed roller 1 by the support member 12. At this time, since the width-adjusting roller 11 is separated from the medium P, the width-adjusting operation is stopped.

[0010]

In the medium conveying mechanism as described above, the pressing roller 2 is supported so that it can come into contact with and separate from the feeding roller 1, and when the nip portions of both rollers are closed, The support member 4 having elasticity is fixed to the connecting plate 5 having rigidity, and the guide portion 6 of the connecting plate 5 is guided by the guide pin 7 as a portion for elastically pressing the pressing roller 2 against the feed roller 1. It has a complicated mechanism. Therefore, there is a problem that the parts cost is high and the assembling work is troublesome. The present invention has been made under such circumstances, and an object of the present invention is to provide a medium transporting mechanism that can be simplified to reduce the cost of parts and facilitate assembly work. .

[0011]

According to the present invention, there is provided a feed roller which is rotationally driven, and a pressing roller which is provided so as to face the feed roller, and a medium which conveys a medium by the feeding roller and the pressing roller. In the transport mechanism, a roller arm that rotatably supports the pressing roller at a distal end portion thereof, a support shaft that rotatably supports a base end portion of the roller arm, and between the support shaft and the roller arm. A biasing member that is provided to constantly bias the roller arm in a direction in which the press roller approaches the feed roller and a nip portion of the feed roller and the press roller by rotating the support shaft are provided. And a nip opening / closing means for opening / closing.

[0012]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a front view of a main part showing an embodiment of a medium carrying mechanism of the present invention, FIG. 2 is a plan view of FIG. 1 seen from the XX direction, and FIG. 4 is a side view seen from the direction A, FIG. 4 is a sectional view taken along line BB of FIG. 2, and FIG. 5 is a sectional view taken along line CC of FIG. 1 to 5, members that are the same as or correspond to those of FIG. 6 showing a conventional example are denoted by the same reference numerals, and description thereof will be omitted.

First, the configuration will be described with reference to FIGS. The motor 20 (only shown in FIG. 2) is capable of rotating its rotation shaft 21 forward and backward by the required angle. The cam 22 fixed to the rotating shaft 21 is formed with a spiral cam groove 22a having a radial distance set corresponding to the rotation angle thereof.

A guide roller 24, which is located inside the cam groove 22a and is driven, is provided in the upper part of the follower 23 having an inverted T shape, and elongated holes 25 and 26 extending in the vertical direction are provided. . By inserting the guide pins 27 and 28 fixed to the housing side into the elongated holes 25 and 26, the driven body 23 is guided so as to make a linear reciprocating motion in the vertical direction.

At the lower part of the driven body 23, elongated holes 29, 30 extending in the left-right direction in the longitudinal direction are provided. The long hole 2
The connecting pins 33 and 34 provided at the end portions of the link levers 31 and 32 are inserted into the pins 9 and 30, respectively. The base ends of the link levers 31 and 32 are fixed to support shafts 35 and 36 that are rotatably supported by the housing FL. On the other hand, a roller arm 3 that pivotally supports the presser roller 2 at the end portion.
The base ends of the reference numerals 7 and 38 are rotatably supported by the support shafts 35 and 36. In FIG. 2, roller arms 37 arranged in parallel on the left side of the drawing support the pressing roller 2 by the same support shaft 2a. On the other hand, the roller arms 38 juxtaposed on the right side of the drawing support the pressing roller 2 by separate support shafts 2b. A feed roller 1 is provided so as to face the pressing roller 2.

As shown in FIGS. 4 and 5, frame-shaped fixing members 39, 40 are integrally fixed to the support shafts 33, 34 adjacent to the roller arms 35, 36.
A biasing member SP including a tension coil spring, a string spring, and the like is stretched between the members 9, 40 and the base ends of the roller arms 37, 38. Therefore, the base ends of the roller arms 37 and 38 that pivotally support the pressing roller 2 are constantly urged by the urging member SP so as to contact the ends 39a and 40a of the fixing members 39 and 40. Therefore, the roller arms 37, 38 can rotate integrally with the support shafts 37, 38. The fixing member 39,
The shape of 40 is not limited to the frame shape as long as it fixes or locks one end of the biasing member SP.
The fixing member may be omitted as long as one end of the biasing member SP can be directly fixed to the support shafts 33 and 34.

As shown in FIGS. 3 and 4, the insertion / ejection port W
The support shaft 1a of the feed roller 1 and the support shaft 2a of the presser roller 2 provided immediately after the gear wheel g1, which mesh with each other.
g2 is fixed. Therefore, in the transport roller 3 provided immediately after the insertion / ejection port W, the rotational force of the feed roller 1 is transmitted to the pressing roller 2. The gears 43 and 44 are omitted in FIG.

According to the above construction, when the cam 22 is rotated by the motor 20, the driven body 23 moves up and down according to the radial position of the cam groove 22a, so that the link levers 31, 32 and the roller arms 37, 38 are moved. Support shaft 35,
It swings up and down with 36 as a fulcrum, and the pressing roller 2 comes into contact with and separates from the feed roller 1. That is, the nip portion of the transport roller 3 opens and closes.

The opening / closing operation of the conveying roller 3 will be described in detail with reference to FIGS. The control means (not shown) is the motor 20.
The operating plate 23 is moved downward by rotating. As a result, the link levers 31, 32 and the roller arms 35, 36 swing about the support shafts 35, 36 as fulcrums to open the nip portion of the transport roller 3. Accordingly
The operator inserts the medium P into the nip portion. Similar to the conventional mechanism, by providing the width-adjusting rollers that are driven and rotated by the front and rear feed rollers 1, the side-edge portion of the medium P can be brought into contact with the reference guide to perform the width-adjusting operation. Since the structure is similar to that of the conventional mechanism, its description is omitted.

The control means rotates the motor 20 in the opposite direction to move the operating plate 23 upward. As a result, the link levers 31, 32 and the roller arms 37, 38 swing around the support shafts 35, 36 as fulcrums to close the nip portion of the transport roller 3. As a result, the medium P is nipped by the feed roller 1 and the pressing roller 2, so that the feeding force by the feed roller 1 is applied and the medium P shown in FIG.
At, the sheet is conveyed to the right and subjected to predetermined processing such as reading and writing of data and printing.

When the processing on the medium P is completed, the medium P is conveyed toward the insertion / ejection port W and ejected by rotating the conveying roller 3 in the opposite direction to the previous direction.

As described above, in the left conveyance roller 3, the rotational force of the feed roller 1 is transmitted to the pressing roller 2 via the gears g1 and g2, so that the upper surface and the lower surface of the medium P are both faced. Since the carrying force is given by the above, there is an advantage that the medium P can be carried more smoothly.

As shown in FIGS. 4 and 5, when the fixing members 39 and 40 fixed to the support shafts 35 and 36 are swung in the direction of the arrow by the swinging of the link levers 31 and 32, the roller arms 37 and 38 are moved. The axially supported pressing roller 2 is elastically pressed against the feed roller 1 by the action of a biasing member SP provided between the fixing members 39, 40 and the base ends of the roller arms 37, 39. . That is, the medium P is elastically pinched by the rollers 1 and 2.

That is, the pressing roller 2 is supported so as to come in contact with and separate from the feed roller 1, and the pressing roller 2 is elastically pressed against the feed roller 1 when the nip portion of both rollers is closed. The mechanism of the support shafts 35, 36,
It suffices that the roller arms 37 and 38 and the biasing member SP are used, and the structure is simplified as compared with the conventional mechanism. Therefore, it is possible to reduce the component cost and facilitate the assembling work as compared with the conventional mechanism.

The correspondence between the above-described embodiment and the claims will be described below.
The actuating plate 23 and the link levers 31 and 32 constitute "nip opening / closing means" for opening / closing the nip portions of the feed roller and the press roller.

[0026]

As described in detail above, according to the medium transport mechanism of the present invention, the roller arm that supports the pressing roller is rotatably supported by the support shaft, and is attached between the support shaft and the roller arm. By providing the urging member, the roller arm is constantly urged in the direction in which the press roller approaches the feed roller, and the support shaft is rotated to open and close the nip portion of the feed roller and the press roller. Therefore, as compared with the conventional mechanism, the structure is simplified, the component cost is reduced, and the assembling work can be facilitated.

[Brief description of drawings]

FIG. 1 is a front view of essential parts showing an embodiment of a medium carrying mechanism of the present invention.

FIG. 2 is a plan view of FIG. 1 viewed from the XX direction.

FIG. 3 is a side view of FIG. 2 viewed from the direction of arrow A.

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a cross-sectional view taken along line CC of FIG.

FIG. 6 is a front view of a main part showing a conventional mechanism.

FIG. 7 is a perspective view of FIG. 6 viewed from below.

FIG. 8 is a side view of FIG. 6 viewed from the direction of arrow A.

[Explanation of symbols]

 1 Feed Roller 2 Pressing Roller 35, 36 Support Shaft 37, 38 Roller Arm SP Biasing Member P Medium

Claims (1)

[Claims] 1. A medium transport mechanism comprising a feed roller that is driven to rotate and a pressing roller that is provided so as to face the feed roller, wherein the feeding roller and the pressing roller convey a medium. A roller arm rotatably supported at a distal end portion, a support shaft rotatably supporting a base end portion of the roller arm, and a presser roller provided between the support shaft and the roller arm. A biasing member that constantly biases the roller arm in a direction approaching the feed roller, and a nip opening / closing means that opens and closes a nip portion of the feed roller and the pressing roller by rotating the support shaft. That is, the medium transport mechanism.