JPH0872489A - Recording medium-driving device - Google Patents

Abstract

PURPOSE: To facilitate the adjustment of pressing force by a method wherein a first adjusting member is adjusted on the basis of the first position of a coiled spring supporting member and a second adjusting member is adjusted on the basis of the first adjusted member. CONSTITUTION: Since a coiled spring supporting member 40 is located at a first position, at which the coiled spring supporting member 40 abuts against the standard member 220 of a pinch roller supporting member 22, in order to adjust a first pressing force, the position is employed as the basis. By moving a first adjusting member 34 backwards and forwards, the length of a coiled spring 33 is changed. Under the condition that the pinching force between a pinch roller 20 and a driving roller 50 is measured with a proper measuring means, the first adjusting member 34 is fixed at the position, at which the first pressing force is generated. The adjustment of a second pressing force is performed on the basis of the first adjusting member 34. By actuating a pressure changing-over lever 43, a coiled spring supporting member 40 is positioned to a second position, at which the coiled spring supporting member 40 abuts against a second adjusting member 35. Under the state just mentioned above, by moving the second adjusting member 35 backwards and forwards, the length of the coiled spring 33 is changed and, after that, the member 35 is fixed to the desired position, resulting in allowing to easily adjust to obtain the second pressing force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device for recording on a recording medium according to a signal, and more particularly to a recording medium driving device for moving the recording medium. More specifically, the present invention relates to a recording medium drive device of a type in which a recording medium is sandwiched between a drive roller and a pinch roller and moved.

[0002]

2. Description of the Related Art Conventionally, various types of recording medium driving devices for moving a recording medium by a driving roller and a pinch roller have been put into practical use. In this system, the recording medium on the driving roller is pinched by a pinch roller with a predetermined pressing (holding) force, and then the recording medium is moved by rotation of the driving roller.

As one of such devices, there has been one in which the pressing force of the pinch roller on the drive medium against the recording medium can be changed according to the type of the recording medium. That is, a thick hard recording medium is strongly sandwiched with a large pressing force, and a thin soft recording medium is applied with a small pressing force. In order to form such a variable pressing (holding) force, the pinch roller is generally supported by a coil spring, and the degree of compression of this coil spring is changed.

[0004]

In the conventional device, one end of the coil spring is fixed to the standard position and the other end is simply constructed so as to be movable by using the movable member. Therefore, it may be difficult to obtain an appropriate pressing force due to manufacturing variations of the coil spring, fluctuations in pressure due to long-term use, and the like. For example, when the pressure of the coil spring changes due to use, there is a drawback in that adjustment for obtaining an appropriate pressing force is almost impossible. The present invention has been made in order to improve this point, and provides a recording medium drive device that can easily adjust the pressing force of a coil spring for urging a pinch roller and can generate an appropriate pressing force. is there.

[0005]

Therefore, according to the present invention, the recording medium is inserted by the driving roller and the pinch roller to transfer the recording medium, and the compression degree of the coil spring connected to the pinch roller is set. In a recording medium drive device in which the pressing force (recording medium holding force) of the pinch roller against the recording medium on the drive roller is varied by changing the position of the pinch roller, one end of the coil spring is held and the first position and the first position are set. A coil spring supporting member movable between two positions, a moving means 43 for moving the coil spring supporting member to the first position and the second position, and a moving direction of the coil spring supporting member with respect to the first and second positions. A first adjusting member, which is provided on an extension line, is positionally adjustable in the moving direction, and holds the other end of the coil spring, and the coil bar. A second adjusting member that defines a second position of the supporting member and is positionally adjustable in the moving direction of the coil spring supporting member, and the moving means causes the coil spring supporting means to move to the first position. The pinch roller sandwiches the recording medium together with the drive roller with the first pressing force when positioned at the second position and the second pressing force when positioned at the second position.

[0006]

[Operation] The coil spring that gives the biasing force to the pinch roller is
The coil spring supporting member that can be in the first position and the second position is bridged between the first adjusting member. When the coil spring support member is in the predetermined position, that is, the first position, the first adjustment member is adjusted to move back and forth to generate the first pressing force. Next, the second adjusting member is variably adjusted to generate the second pressing force when the coil spring supporting member is positioned at the second position.

As described above, in this pressing force generating mechanism, the first adjusting member for generating the first pressing force is first adjusted based on the first position of the coil spring supporting member, and then this first adjusting member is adjusted. As a standard, the second adjusting member for generating the second pressing force is adjusted. Therefore, the pressing force can be adjusted very easily, and readjustment can be performed even when a change or the like occurs due to use, and an appropriate pressing force of the pinch roller can be maintained for a long time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments of the drawings. 1 to 5 show a first embodiment device of the present invention, and FIG. 6 shows a second embodiment device of the present invention.

First, the first embodiment of the present invention will be described with reference to FIGS. 1 is a state diagram in which a pinch roller holds a recording medium with a first pressing force, FIG. 2 is a state diagram in which the pinch roller is raised or disengaged from the state in FIG. 1, and FIG. 3 is a second pressing force in the pinch roller. FIG. 4 is a state diagram in which the recording medium is nipped, FIG. 4 is a state diagram in which the pinch roller is lifted, that is, disengaged from the state in FIG. 3, and FIG.

In each figure, 10 is a support portion for supporting the pinch roller and a guide for moving the pinch roller in the direction traversing the recording medium, 20 is a pinch roller, 21 is a pinch roller movable member, and 210 is A cam engaging member, 22 is a pinch roller supporting member, 220 is a reference member, 23 is a cam shaft, 30 is a pinch roller movable shaft,
31 is a cam, 32 is a connecting shaft, 33 is a coil spring, 34 is a first adjusting member, 35 is a second adjusting member, 40 is a coil spring supporting member, 41 is a stopper, 42 is a transmitting member, 43 is a pressure switching lever, and 50 is The driving roller 70 is a recording medium.

The overall structure of the recording medium driving device according to the present invention will be described with reference to FIG. The guide 10 is a support portion that is hung on a housing (not shown) of the recording apparatus and that supports the pinch roller 20. The guide 10 also moves the position of the pinch roller 20 according to the width of the recording medium 70. But also. The pinch roller structure includes a pinch roller movable member 21 and a pinch roller support member 22. The pinch roller movable member 21 has a pinch roller 20 at its tip and a cam engaging member 21 at the upper center.
0, the connecting shaft 32 is attached or formed in the rear part, respectively. On the other hand, the pinch roller support member 22 is provided with a reference member 220 having a through hole (not shown) at its rear portion.

The pinch roller movable member 21 and the pinch roller support member 22 are connected by a pinch roller movable shaft 30, and a connecting shaft 32 attached to the rear of the pinch roller movable member 21 is a reference member behind the pinch roller support member 22. It is inserted into the through hole 220. The pinch roller support member 22 is supported by the guide 10 at the front.

In this case, the pinch roller movable member 21
The cam engagement member 210 provided in the above is configured to project the pinch roller support member 22. Then, the cam 31 hung on the housing of the apparatus is the cam engaging member 2
It is provided at a position where 10 can be operated.

As shown in FIG. 5, the connecting shaft 32 has a coil spring 33, a first adjusting member 34, and a second adjusting member 35 having a hole (not shown) through which the connecting shaft 32 holding the coil spring 33 is inserted. The coil spring support member 40 is inserted. The lower end of the coil spring support member 40 is supported by the reference member 220 of the pinch roller support member 22 in a normal state. The coil spring 33 is supported between the coil spring supporting member 40 and the first adjusting member 34.

The first adjusting member 34, which is a screw in this embodiment, is attached to the connecting shaft 32 so as to be movable back and forth. The second adjusting member 35 is supported by a shaft formed by a screw (not shown) parallel to the connecting shaft 32, and is configured to be vertically movable with respect to the connecting shaft 32 by advancing and retracting the screw shaft. The coil spring support member 40 serves as a stopper 41 whose upper portion is regulated by the second adjustment member 34, and can be positioned at the first position and the second position by the pressure switching lever 43 via the transmission member 42. .

Now, consider the case of the state shown in FIG. The coil spring support member 40 is in contact with the reference member 220 of the pinch roller support member 22. In this specification,
This position of the coil spring support member 40 will be referred to as the first position. At the first position, as shown in the left diagram of FIG.
The length of the coil spring 33 is L1. The cam 31 and the cam engaging member 210 of the pinch roller movable member 21 are in a released state. Therefore, a predetermined pressing force is applied to the pinch roller 20 by the restoring force of the coil spring 33 inserted in the connecting shaft 32, and the recording medium 70 is held with the driving roller 50 with the first pressing force.

When the cam 31 is reversed from the state shown in FIG. 1, the cam engaging member 2 is moved by the cam 30 as shown in FIG.
10 is rotated clockwise about the pinch roller movable shaft 30 as a fulcrum, and the pinch roller 20 is disengaged.

Now, as shown in FIG. 3, the pressure switching lever 43 is rotated to raise the coil spring supporting member 40 to the upper position. At this raised position, as shown in the right diagram of FIG. 5, the stopper 41 above the coil spring holding member 40 is in contact with the second adjusting member 34. In this specification, this position will be referred to as the second position. As shown in the figure, the second position is the length of L2 in which the coil spring 33 is compressed more than in the state shown in FIG. Therefore, due to the restoring force of the coil spring 33, the second pressing force larger than the first pressing force is applied to the pinch roller 20.

Next, a method of adjusting the first pressing force and the second pressing force will be described with reference to FIG. First, as shown in the left diagram of FIG. 5, the first pressing force is adjusted. At this time, the coil spring support member 40 is moved to the pinch roller support member 2
Since it is in the first position in contact with the second reference member 220,
This position is the standard. In this state, the first adjusting member 34
Is moved back and forth to change the length of the coil spring 33.
The first adjusting member 34 is fixed at a position where a desired first pressing force is generated while measuring the sandwiching force between the pinch roller 20 and the driving roller 50 with an appropriate measuring means.

The second pressing force is adjusted as shown in the right diagram of FIG. In this adjustment, the first adjusting member 34 serves as a standard. By operating the pressure switching lever 43 described above,
The coil spring support member 40 is positioned at the second position where it abuts on the upper second adjustment member 35. In this state, the second adjusting member 35 is moved back and forth to change the length of the coil spring 33 and fix the coil spring 33 at a desired position.

FIG. 6 is a schematic diagram showing a second embodiment of the present invention. In the second embodiment, one end of the coil spring 33 is held by the first coil spring support member 40, and the other end is held by the second coil spring support member 60.
The second adjusting member 35 and the third adjusting member 36 are provided between 60. The first coil spring support member 40 has the first position shown and the first stopper 41 of itself is the second adjustment member 35.
The second coil spring support member 60 can be held at the third position shown in the drawing and the fourth position where the second stopper 61 of the second coil spring support member 60 can contact the third adjusting member 36. Is configured. As the moving means, the pressure switching lever or the like described above can be used.

In this embodiment, the second coil spring support member 60, the second adjusting member 35, and the third adjusting member 36 are attached to the connecting shaft 32 so that they can move back and forth like the second adjusting member shown in the previous embodiment. The lengths of the coil springs are adjusted to the lengths of L1, L2, L3, and L4 according to the position changes of the coil spring support members 40 and 60.
These adjustment methods first determine the position of the second coil spring support member 60 with the reference member 220 of the pinch roller support member 22 as the position reference, as in the previous embodiment. Then
Regarding the second adjusting member 35, the second coil spring supporting member 6
0 is adjusted with respect to the third adjusting member 36 using the first coil spring support member 40 as a position standard.

Each coil spring support member 40, 60
Since it is possible to take two positions, in this embodiment, one coil spring can perform four kinds of pressure switching with respect to the pinch roller depending on the combination of the two positions.

[0024]

As described above, according to the present invention, there are advantages that a plurality of pressures can be applied to the pinch roller and adjustment for proper pressure can be easily performed. Therefore, even if the coil spring that applies pressure to the pinch roller has a variation or a variation due to use, it can be adjusted very easily and the appropriateness can be maintained for a long time.

[Brief description of drawings]

FIG. 1 is a side view relating to a first embodiment of the present invention and is a state diagram in which a first pressing force is generated.

FIG. 2 is a side view in which the pinch roller is disengaged from the state of FIG.

FIG. 3 is a side view showing a state in which a third pressing force is being generated.

FIG. 4 is a side view showing a state in which the pinch roller is disengaged from the state of FIG.

FIG. 5 is a side view showing a configuration of a main part of the present invention.

FIG. 6 is a configuration explanatory view showing a second embodiment of the present invention.

[Explanation of symbols]

 20: Coil spring 32: Connection shaft

Claims (3)

[Claims] 1. A recording medium 70 is inserted by a drive roller 50 and a pinch roller 20 to transfer the recording medium 70, and the degree of compression of a coil spring 33 connected to the pinch roller 20 is varied. The pinch roller 2
In a recording medium drive device in which the pressing force (recording medium holding force) on the recording medium 70 on the drive roller 50 of 0 is varied, one end of the coil spring 33 is held and the first position and the second position are held. Coil spring support member 4 movable between
0, moving means 43 for moving the coil spring supporting member 40 to the first position and the second position, the coil spring supporting member 4 relating to the first and second positions
A first adjusting member 34, which is provided on an extension line of the moving direction of 0 and whose position can be adjusted with respect to the moving direction and which holds the other end of the coil spring 33, defines a second position of the coil spring supporting member 40. And a second adjusting member 35 capable of position adjustment with respect to the moving direction of the coil spring supporting member 40, and when the coil spring supporting means 40 is positioned at the first position by the moving means 43. The first pressing force causes the pinch roller 20 to move together with the driving roller when the recording medium 70 is moved to the second position.
A recording medium driving device sandwiching a recording medium. 2. A recording medium driving device in which a recording medium 70 is inserted by a driving roller 50 and a pinch roller 20 and the recording medium 70 is transferred. The recording medium driving device has a supporting portion 10 and a reference member 220 for defining a first position. It has a pinch roller support member 22 attached to the support portion 10, a pinch roller 20, a connecting shaft 32 into which a cam engagement member 210 and a coil spring 33 are inserted, and is rotatable about a pinch roller movable shaft 30 as a fulcrum. The pinch roller movable member 21 supported by the pinch roller supporting member 22, abutting against the reference member 220 of the pinch roller supporting member 22 and the connecting shaft 3 of the pinch roller movable member 21.
A coil spring supporting member 40 for receiving one end of a coil spring 33 inserted in the second spring, a first adjusting member 34 supported for position adjustment on the connecting shaft 32 of the pinch roller movable member 21 and receiving the other end of the coil spring 33, A second adjusting member 36, which is provided at a predetermined position of the pinch roller supporting member 22 so as to be positionally adjustable with respect to the reference member 220 and defines a second position with respect to the coil spring supporting member 40, and the coil spring supporting member 40 described above. The pressure adjusting lever 43 is located at the first position and the second position, and the cam 31 is engaged with the cam engaging member 210 of the pinch roller movable member 21. The first adjusting member 34 and the second adjusting member are provided. In adjusting the member 35, the coil spring support member 40 is moved to the first position by the pressure switching lever 43. In the installed state, the position of the first adjusting member 34 is changed to adjust the first pressing force, and after the adjustment of the first adjusting member 34, the position of the second adjusting member 35 is changed to change the second pressing force. By adjusting the pressure switching lever 43 to generate a first pressing force when the coil spring supporting means 40 is positioned at the first position and a second pressing force when the coil spring supporting means 40 is positioned at the second position. A recording medium drive device in which the pinch roller 20 holds the recording medium 70 together with the drive roller 50 with a predetermined pressing force by the action of the cam 31 with the cam engagement member 210 of the pinch roller movable member 21. 3. A recording medium 70 is inserted by a driving roller 50 and a pinch roller 20 to transfer the recording medium 70, and the compression degree of a coil spring 33 connected to the pinch roller 20 is changed. The pinch roller 2
In a recording medium driving device in which the pressing force (recording medium holding force) on the recording medium 70 on the driving roller 50 of 0 is varied, one end of the coil spring 33 is held and the first position and the second position are set. A positionable first coil spring support member 40, first moving means for moving the first coil spring support member 40 to the first position and the second position, holding the other end of the coil spring 33, and A second position that can be positioned at a third position and a fourth position on an extension line in the moving direction of the first coil spring support member 40 with respect to the first and second positions, and that can be adjusted in the moving direction with respect to the third position. Coil spring holding member 60, second moving means for moving the second coil spring supporting member 60 to the third position and the fourth position, the first coil spring supporting member 40 of the first A second adjusting member 35 that defines the position and that can adjust the position in the moving direction, a fourth position that defines the fourth position of the second coil spring support member 60, and that can adjust the position in the moving direction. And a first adjusting force when the first coil spring supporting means 40 is positioned at the first position and the second coil spring supporting means 60 is positioned at the third position. First coil spring support means 4
0 is the first position and the second coil spring supporting means 60 is at the fourth position, the second pressing force is when the second coil spring supporting means 60 is at the fourth position, and the first coil spring supporting means 40 is at the second position. When the third coil spring is located at the third position, the first coil spring supporting means 40 is at the second position, and the second coil spring supporting means 60 is at the fourth position. A recording medium driving device which is provided to each of the pinch rollers 20.