JP2623560B2 - Printer paper feed mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed of a printer that feeds a paper by rotating a platen.

(Prior Art) A printer receives a sheet inserted from the outside with a guide plate and guides the sheet to a sheet holding plate, and then presses the sheet against a platen by the sheet holding plate to transmit the rotation of the platen to the sheet and feed the sheet. It has a mechanism.

By the way, since the paper holding plate is usually formed of a metal plate, burrs are likely to be generated at the end in contact with the recording paper. If no deburring is performed, the friction coefficient with the paper is large, and the paper feed In this case, there is a problem that a large load is applied to the platen and a motor having a large torque is required.

(Purpose) The present invention has been made in view of the above problems, and has as its object a novel frictional force with paper and a novel processing which does not particularly require finishing such as deburring. It is to provide a paper feeding mechanism.

(Summary of the Invention) That is, the feature of the present invention is that a sheet inserted into a platen is guided by a guide plate to a sheet holding plate,
In a paper feed mechanism of a printer that presses the paper against the platen by the paper pressing plate and feeds the paper, the paper pressing plate includes a first plate made of a polymer material and a second plate made of metal, The first plate is overlapped so as to be on the platen side, and the lower portion is supported below the platen, and the upper portion is configured to move to and away from the platen by a lever.

(Embodiment) Therefore, the details of the present invention will be described below based on an illustrated embodiment.

FIG. 1 shows an embodiment of a printer to which the present invention is applied. In the drawing, reference numeral 1 denotes a platen, and a paper guide plate 10, a paper holding plate 20, and a paper regulating mechanism 30 are arranged in a paper insertion direction. It is provided on a frame 40. In the drawings, reference numeral 2 denotes a paper pressing roller, and reference numeral 3 denotes a print head.

FIGS. 2 and 3 show an embodiment of the paper guide plate 10 for the paper, in which the machine frame 40 extends along the outer periphery of the platen 1. FIG.
And a paper press roll 2 from the top of the platen 1
A slope 11 for receiving paper to guide the user to (FIG. 1),
It is provided with a curved portion 12 formed in accordance with the curvature of the platen 1 so as to be located below the slope portion 11 continuously, and provided with cutout portions 13 and 13 at a position facing the paper pressing roller 2. ing.

On the back side, as shown in FIG. 3, the forked portions 14, 14, 14 which substantially correspond to the thickness of the rear wall 41 of the machine frame 40 are provided at positions where they contact the machine frame 40.
A plurality of ‥‥ are erected in a straight line in the vicinity of the boundary between the inclined surface portion 11 and the curved portion 12 so as to have an angle capable of maintaining the interval between the paper guide surface, particularly the curved portion 12 and the platen 1, and Are provided with claws 15, 15, 15 # for elastically engaging the machine frame 40 with the forked portions 14, 14, 14 # engaged with the upper surface of the rear wall.

The machine frame 40 fits the paper guide plate 10
A rear wall 41 is formed on the back side such that the curved portion 12 of the ten forms a predetermined gap with the platen 1, and slopes 42 a, 42 a, 42 a (first) are provided on the carriage side to support the back side of the paper guide plate 10.
Abutting portions 42, 42, 42 each having a claw 15 are provided at positions where the inclined portions 11 of the paper guide plate 10 can be elastically locked.
Slope 43a, 4 that slopes outward and downward, engaging with 15, 15 °
Protrusions 43, 43, 43 having 3a, 43a are formed. Reference numeral 18 in the drawing indicates a window from which the detection piece of the paper detector projects.

In this embodiment, a forked portion 14,
When 14 and 14 ‥‥ are aligned with the rear wall 41 of the machine casing 40 and pushed down, the forked parts 14, 14, and 14 ‥‥ are brought into contact with the contact portions 4 of the machine casing 40.
2, 42, 42 ° engage. If you push it down further,
The rear claws 15, 15, 15 ° move downward and engage while being bent outward by the slopes 43a, 43a, 43a of the projections 43, 43, 43 of the machine frame 40.

Accordingly, the guide plate 10 is entirely engaged with the rear wall 41 of the machine frame 40 and the forked portions 14, 14, 14 ° due to its own elasticity, and the contact portions 42, 42, 42 of the rear wall 41. The position of the curved portion 12 of the paper guide plate 10 with respect to the platen 1 is obtained by contact with the plate ‥‥, and at the same time, the elasticity of the paper guide plate 10 is exerted rearward by the claws 15, 15, 15 ‥‥. Warpage and deformation of the slope 11 are corrected.

FIG. 4 shows an embodiment of the above-mentioned sheet pressing plate. In the drawing, reference numeral 50 denotes a first sheet pressing plate disposed on the front surface side of the platen 1 and in contact with the platen 1. Sometimes the upper end side is bent toward the carriage side, and the lower side has a through hole 5 which engages with the pawls 44, 44, 444 ‥‥ formed on the machine frame 40.
A plurality of holes 2, 52, 52 # are formed in the longitudinal direction, and windows 53, 53, 53 # for adjusting elasticity are provided on the polymer plate at an intermediate portion.

Reference numeral 56 denotes a second paper pressing plate made of a metal plate material which is disposed on the first paper pressing plate 50, and the claws 44, 44, 44 of the machine frame 40 just like the first paper pressing plate 50. Through hole 5 that engages ‥‥
7, 57, 57 mm and windows 58, 58, 58 mm.

On the other hand, the machine casing 40 has a projection 4 having an inclined surface 44a inclined downward from the upper side so that the upper ends of the first and second sheet pressing plates 50 and 56 are in contact with the carriage side below the platen 1.
4, 44, 44 ‥‥ are formed, and the first and second paper holding plates 50, 56 are provided with an interval for enabling insertion, and
A stop member 45 is disposed at a position slightly below 44, 44, 44 °.

According to such a configuration, the first and second paper holding plates
50, 56, these through holes 52, 52, 52 、, 57, 57, 57 ‥
When it is positioned and pressed down so that ‥ comes to the position of the pawls 44, 44, 44, the lower ends of the paper holding plates 50, 56
The sloping surface 44a slides into the gap with the stopper member 45, and the pawl 44 penetrates the through holes 52 and 57 and is held between the stopper member 45.

In this state, when a release shaft 60, which will be described later, is brought into contact with the sheet holding plates 50, 56, the lower ends of the paper holding plates 50, 56 are claw 44, 44,
It is fixed to a predetermined area by being supported by the 44 ° and the stopper member 45 and by the release shaft 60 above.

60 is the release software described above, and lever 63 described later
The protrusions 61, 61, 61 # which are rotated by the second sheet pressing plate 56 and come into pressure contact with a relatively strong force, and a surface 62 which comes into pressure contact with a weak force at the time of release.

On one side of the machine frame 40, a pin 46a into which the release lever 63 is inserted (FIG. 5), an arc-shaped window 46b allowing the protrusion 63c to penetrate are formed, and further, the shaft end of the release shaft 60 is exposed. A circular hole 47 is provided to the extent that it can be locked.

Reference numeral 63 denotes the above-described release lever, which has a hole 63a that engages with the projection 46a at a position that is the center of rotation, and a projection that engages with the transmission member 65 at the tip of the outer surface when inserted into the pin 46a.
63b is further provided with a claw 63c that can penetrate into the arc-shaped state 46b and that can move in the circumferential direction on the back side.

Reference numeral 65 denotes the transmission member (FIG. 6) described above, which is provided with a shaft hole 65a which is engaged with the shaft end of the release shaft 60 exposed from the machine frame 40 so that relative rotation cannot be performed. The long hole 6 that engages with the projection 63b of the release lever 63 on the side that becomes the surface
5b, and a claw 65c is formed on the back surface side so as to engage with the hole 47 of the machine frame 40 and make it rotatable.

According to this configuration, when the lever 63 is positioned in accordance with the positions of the pin 46a and the arc-shaped window 46b and pressed toward the machine frame 40,
The claw 63c is pressed against the side surface of the arc-shaped window 46b, elastically deforms toward the center, and enters the back side of the machine casing 40. In this state, when the shaft hole 65a and the long hole 65b of the transmission member 65 are respectively aligned with the shaft end of the release shaft 60 and the protrusion 63b of the lever 63 and pushed into the machine frame 40, the claw 63c is By entering the hole 47 of the forty, it is prevented from falling off from the machine frame 40 and can be rotatably mounted.

When the lever 63 is rotated in the platen circumferential direction in the assembled state, the release shaft 60 is rotated via the transmission member 65. As a result, when the protrusions 61, 61, 61 abut against the paper pressing plates 50, 56, the paper pressing plates 50, 56 strongly press the paper against the platen 1 and cause slippage between the platen 1 and the paper. In addition, the rotation of the platen 1 is transmitted to the sheet, and the first pressing plate 50 made of a polymer material in contact with the sheet reduces friction and feeds the sheet smoothly.

When the lever 63 is rotated to the other side, the release shaft 60
The platen 1 comes in contact with the paper holding plates 50 and 56.
And the frictional force between the paper and the paper is reduced, so that the continuous paper fed by the sprocket described later can be appropriately slipped.

FIG. 7 shows an embodiment of the paper regulating mechanism 30. In the drawing, reference numeral 5 denotes a rotatable upper lid, which is rotatably mounted at the upper end of the upper surface of the box on the print head side, and is attached to the tip. Is constituted by arranging a plurality of ribs 31 described later in a line in the axial direction of the platen 1 in parallel with the platen axis.

FIG. 8 shows an embodiment of the above-described rib 31. When the upper lid 5 is set on the printer 6, the upper end 5 receives the leading edge of the sheet when setting the sheet and guides it to the back side of the surface of the platen 1. 1, a top 31b for pressing the sheet against the platen 1 with a gap as small as possible, and a second slope 31c for guiding the printed portion upward.

Next, the operation of the paper regulating mechanism thus configured will be described with reference to FIG.

Fix the upper lid 5 to the printer 6, and place the platen 1
When the paper K is inserted between the paper guide plate 10 and the paper guide plate 10 (I in FIG. 1), a sensor (not shown) detects the insertion of the paper and rotates the platen 1. As a result, the sheet K is guided by the curved portion 12 and the sheet pressing plates 50 and 56 along the slope 11 of the guide 10. The first paper pressing plate 50 made of a polymer constituting the paper pressing plate 10 comes into contact with the surface of the paper, and the pressing force of the second pressing plate 56 made of metal acts on the paper. As a result, the paper K protrudes after being securely inserted into the paper guide portion D of the carriage at the leading end.

In this process, since the surface of the sheet K is in contact with the polymer material, even if a small burr exists on the second sheet pressing plate 56 made of, for example, a metal material, the burr may be affected by the burr. The second paper presser plate 56 moves with very little friction and the backside against the platen 1 made of rubber.
, And is smoothly fed out in accordance with the rotation of the platen 1.

In this manner, the leading end of the sheet K protruding from the carriage is further fed upward by the platen 1 and
31 abuts on the first slope 31a (II), moves forward (rightward in the figure) along the slope 31a, and reaches the vertex 31b (I
II).

As a result, the paper K is pressed against the elasticity of the paper, that is, against the waist of the paper by the apex 31b immediately above the print head, and a resistance force is applied to the platen 1 in the axial direction.

When the paper has moved to the predetermined position in this way,
The rotation of the platen 1 stops and printing starts. When printing for one line is completed, the platen 1 is rotated by a width corresponding to one line sentence to feed the paper. In this process, the portion where printing is completed moves upward along the second slope 31c and is discharged upward (IV).

FIG. 10 shows an embodiment of the above-described continuous paper feeding mechanism. In FIG. 10, reference numeral 80 denotes a continuous paper feeding mechanism, and a sprocket 81 which can slide in the axial direction in accordance with the paper width.
Is mounted on a fixed shaft 82, and is connected by a train wheel 83 to a rotating shaft 84 engageable with the gear 1a of the platen drive shaft, and both sides are supported by bases 85, 85. At the lower ends of the bases 85, 85, claws 86, 87 are provided in the front-rear direction, respectively, so as to be detachable from the insertion ports 6a, 6b of the printer 6.

(Effects) As described above, in the present invention, the sheet inserted into the platen is guided to the sheet holding plate by the guide plate,
In a paper feed mechanism of a printer for feeding a paper by pressing a paper against a platen by a paper holding plate, the paper holding plate includes a first plate made of a polymer material and a second plate made of a metal, the first plate being Are overlapped on the platen side, and the lower part is supported below the platen, and the upper part is configured to move to and away from the platen by a lever. Since a plate of a polymer material, which is extremely rarely generated, can be brought into contact with the recording sheet, the friction between the sheet pressing plate and the recording sheet can be reduced without requiring a special deburring process.

In addition, since the sheet holding member is formed by superimposing plate materials made of different materials, it is possible to selectively arrange the plate material made of a polymer at the upper end so as to be located at the upper end, and to position the sheet material at the back side. The metal sheet having elasticity that generates the pressing force applied to the paper feeding as the second paper holding plate to be used, and the contact position of the first paper holding plate can be freely selected, and the design flexibility can be increased. Becomes

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a printer to which the present invention is applied. 2 and 3 are perspective views each showing an embodiment of the paper guide. FIG. 4 is an assembled perspective view showing one embodiment of the paper holding plate. FIGS. 5 (a) (b) and 6 (a) (b) are a side view and an assembled perspective view, respectively, showing an embodiment of a drive mechanism of the release shaft. 7 and 8 are a perspective view showing an embodiment of a paper pressing mechanism and a side view showing a rib in an enlarged manner, respectively. 9 (I) to 9 (IV) are explanatory views showing the operation of the paper regulating mechanism. FIG. 10 is a perspective view showing an embodiment of a printer provided with a continuous paper feed mechanism and the paper feed mechanism of the present invention. DESCRIPTION OF SYMBOLS 1 ... Platen, 10 ... Paper guide plate 20 ... Paper press plate, 30 ... Paper regulating mechanism 31 ... Rib, 40 ... Machine frame 50 ... First paper press plate made of polymer material 56 ... ... Metal second paper holding plate

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-42478 (JP, A) Practical application Contents of the specification and drawings attached to the application form No. 58-62001 (Japanese Utility Model Publication No. 59-166951) Microfilm (JP, U) Microfilm (JP, U) Photographing the contents of the specification and drawings attached to the application form of Japanese Utility Model Application No. 55-73908 (Japanese Utility Model Application No. 56-175713)

Claims (1)

(57) [Claims] 1. A paper feed mechanism of a printer for guiding a paper inserted into a platen to a paper holding plate by a guide plate and pressing the paper against the platen by the paper feeding plate to feed the paper, wherein the paper holding plate comprises: A first plate made of a polymer material;
A second plate made of metal is overlapped so that the first plate is on the platen side, the lower part is supported below the platen, and the upper part is moved by the lever so as to be able to contact and separate from the platen. Printer paper feed mechanism configured as follows.