JPH0315314Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a paper holding device for a printer or the like.

Conventionally, in this type of device, recording paper is wound around a platen and fed while being pressed by a paper presser roller, but the position of the paper presser roller needs to be varied depending on the width of the recording paper. .
The means for this adjustment is to move the member holding the paper pressing roller along a guide plate or the like provided along the platen and fix it at an appropriate position. As this fixing means, teeth are provided on the guide plate,
The claws are engaged with these teeth, but the positioning accuracy depends on the pitch of the teeth, and moreover, the width of the claws tends to be smaller.
Therefore, if the positioning accuracy is made finer, the strength of the claws decreases and becomes unstable, and if the strength of the claws is increased, the positioning accuracy cannot be increased.

This invention was made in view of these points, and the purpose is to provide a paper holding device for printers, etc., which can perform positioning at a fine pitch and has sufficient strength. shall be.

This idea includes a cylindrical body around which the recording paper is wound.
A guide plate in which square teeth consisting of protrusions and recesses located between these protrusions are carved at a predetermined pitch is provided in parallel with the cylindrical body, and the holder is slid on the guide plate. An arm is rotatably attached to the holding body and is provided with a paper pressing roller that can be freely attached to and moved toward and away from the platen. A plurality of the teeth are arranged in parallel along the direction in which the teeth are arranged, and the engagement claws other than the engagement claw that engages with the recess are engaged with the top surfaces of the teeth. It is something. Therefore, the arm positioning accuracy can be made finer than the tooth pitch, and
Since the width of each engaging pawl can be equal to the width of the recess of the tooth, the strength of the engaging pawl itself can be increased, which eliminates the conflicting demands of fineness of the positioning pitch and increased strength of the engaging pawl. It is designed so that they can be achieved at the same time.

An embodiment of this invention will be explained based on the drawings.
First, a platen 1 serving as a cylinder is rotatably provided between frames (not shown), and a recording paper 2 is wound around the platen 1. Two guide shafts 3 are provided in parallel at the front of such a platen 1, and a carriage 4 is provided on these guide shafts 3 so as to be able to reciprocate. A printing head 6 having a nozzle surface 5 facing the platen 1 is attached to such a carriage 4. As shown in FIG.

Next, a guide plate 7 is provided at the upper front part of the platen 1 in parallel with the platen 1.
A protrusion 8a is provided on the platen 1 side of this guide plate 7.
Square-shaped teeth 8 are formed at equal pitches and are formed by a concave portion 8b located between these protrusions 8a.
Such a guide plate 7 is provided with two holders 10 which are formed in a U-shape and have a square hole 9 that fits into the guide plate 7, and on the front side of these holders 10, A holding protrusion 12 having a hole 11 and protruding with a predetermined width is formed. An arm 13 made of sheet metal is attached to each of the holding protrusions 12. These arms 13
Flanges 15 with fitting holes 14 are formed on both sides of the holding protrusion 12 at the base thereof, and are rotatably held by pins 16. Further, three clamp claws 17, which serve as engagement claws that engage with the teeth 8 of the guide plate 7, are provided elastically and separated from the middle portion by cutting and raising so that they can move independently. . These clamp claws 17 are 1/2
They are provided for each pitch, and therefore, the arm 13 can be positioned at 1/2 pitch without making the pitch of the teeth 8 fine. Further, a plurality of positioning notches 18 are formed on the side surface of the arm 13.

Furthermore, a block 19 is fixed to the lower end of the arm 13. A shaft 20 that passes through the block 19 together with the arm 13 and is rotatably mounted is vertically mounted on the block 19.
At the upper end of the pin 21 is a relatively long stopper.
are provided along the longitudinal direction of the arm 13,
A block body 22 is fixed to the lower end of the shaft 20. This block body 22 is provided with a horizontal shaft 23, and a paper pressing roller 24 is rotatably provided on this horizontal shaft 23.

Next, a rotation angle regulating body 2 is attached to the arm 13.
5 is installed. This rotation angle regulating body 25
A bent portion 26 for holding the arm 13 is formed in the arm 13, and an elastic leg 28 having a claw 27 that engages with and disengages from the positioning notch 18 extends from one side. Further, an opening 29 is formed in the rotation angle regulating body 25, and abutment surfaces 30, on which the pin 21 comes into contact, are formed on both side edges of the opening 29 to face each other.

In this configuration, the recording paper 2 is wound around the platen 1, and the paper pressing rollers 24 are joined near both side edges of the recording paper 2. At this time, arm 13
When the holder 10 is raised up, the clamp claws 17 are disengaged from the teeth 8 of the guide plate 7, thereby causing the holder 10 to reciprocate along the guide plate 7. Then, after setting the position appropriately and folding down the arm 13, the clamp claw 1
7 meshes with the recess of the tooth 8. The clamp pawl 17 that did not fall into the recess engages with a relatively shallow engagement groove 31 formed in the longitudinal direction along the top surface of the teeth 8 of the guide plate 7, thereby elastically holding the arm 1. It has the effect of keeping it in place. Therefore, the paper pressing force of the paper pressing roller 24 is maintained by this holding force.

When the recording paper 2 advances in this state, the paper pressing roller 24 is inclined in the direction in which the inner portion advances in the direction of travel, and as the recording paper 2 advances in this state, the recording paper 2 is pulled in both directions. Platen 1
closely adhere to. Then, when the traveling direction of the recording paper 2 is reversed, the inclination direction of the paper pressing roller 24 is also reversed to bring the recording paper 2 into close contact with the platen 1.

During use, the width of the recording paper 2 varies; at this time, the arm 13 is raised, moved along the guide plate 7, and then brought down at an appropriate position as described above. At this time, the arm 13 is positioned by the engagement between the clamp claw 17 and the teeth 8, but even if the pitch of the teeth 8 is made coarser and the width of the clamp claw 17 is increased, the protrusion 8a and the recess 8b At least 1/2 of tooth 8 when the width matches
Positioning is possible with pitch accuracy. Therefore, in this type of device where lateral pressure tends to be large, the use of a clamp claw 17 with high strength results in excellent durability.

Furthermore, the inclination of the paper pressing roller 24 has a large effect on the tensile force and rolling force on the recording paper 2, but the degree of inclination can be changed by moving the rotation angle regulating body 25 back and forth. Adjustment is made by changing the contact state of 21 to the contact surface 30. In addition, when the inclination angle can be fixed, it is sufficient to remove the rotary inclination angle control member 25 and fix the stopper that contacts the pin 21 to the arm 13.

This idea includes a cylindrical body around which the recording paper is wound.
A guide plate in which square teeth consisting of protrusions and recesses located between these protrusions are carved at a predetermined pitch is provided in parallel with the cylindrical body, and the holder is slid on the guide plate. An arm is rotatably attached to the holding body and is provided with a paper pressing roller that can be freely attached to and moved toward and away from the platen. A plurality of the teeth are arranged in parallel along the direction in which the teeth are arranged, and the engagement claws other than the engagement claw that engages with the recess are engaged with the top surfaces of the teeth. The positioning accuracy can be made finer than the pitch of the teeth, and the width of each engaging pawl can also be equal to the width of the recess in the tooth, so the strength of the engaging pawl itself can be increased. This has the effect of simultaneously achieving the conflicting demands of fineness of the pitch and increased strength of the engaging claw.

[Brief explanation of drawings]

The drawing shows one embodiment of this invention.
The figure is a vertical side view, Figure 2 is an exploded perspective view, Figures 3 and 4 are plan views showing the state in which the direction of the paper press roller changes depending on the direction of travel of the recording paper, and Figure 5 is a guide plate. 6 is a sectional view taken along line AA in FIG. 5, and FIG. 7 is a sectional view taken along line BB in FIG. 5. DESCRIPTION OF SYMBOLS 1...Platen (cylindrical body), 2...Recording paper, 7...Guide plate, 8...Teeth, 8a...Protrusion, 8b...Recessed part, 13...
Arm, 17...clamp claw (engaging claw), 24...paper press roller.

Claims (1)

[Scope of utility model registration request] A cylindrical body around which recording paper is wound is provided, and a guide plate in which square teeth consisting of protrusions and recesses located between these protrusions are carved with a predetermined pitch is placed parallel to the cylindrical body. , a holder is slidably attached to the guide plate, an arm provided with a paper pressing roller that moves toward and away from the platen is rotatably attached to the holder, and the arm is engaged with the recess. A plurality of engaging pawls formed in the width are arranged in parallel along the arrangement direction of the teeth so as to be close to each other, and the engaging pawls other than the engaging pawls that engage with the recessed portions A paper holding device for a printer, etc., characterized in that the paper holding device is engaged with the top surface.