JPH04151276A - Paper clamping device - Google Patents

Abstract

PURPOSE:To prevent a paper from slipping by providing in a paper holder of a clamper a groove having arc cross section extending in the cross direction of the paper, fixing a rubber material having circular cross section in the groove, and surrounding a half or more of the periphery of the cross section of the rubber material by the internal surface of the groove. CONSTITUTION:A rubber material 24 having circular cross section is surrounded by the internal surface of a groove 23a at most parts of the periphery of the cross section and the inside part of the groove 23a can not be deformed. Therefore, the rubber material 24 does not extend in a rectangular direction with respect to a pressing force even if it is exerted by a spring 9. Accordingly, the pressing force from a clamper 21 is transmitted to a paper 6 efficiently and a holding power of the paper 6 becomes large. Further, since only a part of the periphery of the rubber material 24 having the circular cross section is exposed, an area contacted with the paper 6 becomes small, so that the holding power becomes uniform and the exposed part of the rubber material 24 is scarcely deformed. As a result, a slippage of the paper 6 to the right side due to the deformation of the rubber material 24 does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper clamp device in which a rubber material as a friction material is provided between a pair of clampers that clamp and convey paper.

[Prior Art] FIG. 4 is a block diagram showing the main parts of an example of a conventional printer.

In the figure, symbol (1) is the platen roller, (2) is the thermal head provided opposite to the platen roller (1), and (3) is the space between the platen roller (1) and the thermal head (2). This is the ink sheet being fed, and this ink sheet (3) is connected to the supply core (4) and the take-up core (
5) It is wrapped around.

(6) is the platen roller (1) and thermal head (2)
The paper is conveyed in the direction of arrow A in the figure through the
7) is a pinch roller.

(8) is a pair of clampers that clamp the leading edge of the paper (6), an upper clamper (8a) and a lower clamper (8b).
It has (9) is a spring that biases the upper clamper (8a) toward the lower clamper (8b); (10) is a rubber sheet glued to the upper surface of the lower clamper (8b);
) consists of a pair of clampers (8), a spring (9), and a rubber sheet (
10) A paper clamp device having a clamper opening/closing mechanism (not shown), a clamper moving means (not shown), and the like.

In the conventional printer paper clamp device (11) configured as described above, the leading end of the paper (6) is clamped between the pair of clampers (8) by the pressing force of the spring (9). Thereafter, as the thermal printer (2) prints, the paper clamp device f (11) gradually moves to the left of arrow A in the figure, thereby transporting the paper (6). At this time, the paper (6) comes into contact with the rubber sheet (10) which is a friction material, so that the paper (6) is clamped (
8) held between.

[Problem to be solved by the invention] The conventional paper clamp device f (1
In 1), as shown in FIG. 5, a flat rubber sheet (10) is provided on a lower clamper (8b) via an adhesive layer (10a). In this state, when the rubber sheet (10) receives a pressing force from the spring (9), the rubber sheet (10) deforms without changing its cross-sectional area, so it moves in the direction of the pressing force (up and down in the figure). While being reduced, it also extends in the direction perpendicular to the pressing force (left-right direction in the figure). For this reason, part of the force applied to the paper (6) by the spring (9) escapes in the direction perpendicular to the pressure force, and the paper (6)
There was a problem in that the holding force for 6) was reduced, causing sheet misalignment.

This invention was made with the aim of solving the above-mentioned problems, and it is possible to efficiently transmit the force of the clamper to clamp the paper to the paper, thereby increasing the holding force against the paper. A paper clamp device that can prevent paper misalignment.

[Means for Solving the Problems] A paper clamp device according to the present invention provides a groove having an arcuate cross section extending in the width direction of the paper in the paper holding portion of the clamper, and fixes a rubber member having a circular cross section within this groove. , and more than half of the cross-sectional outer circumference of the rubber material is surrounded by a clear inner wall surface.

[Function] In this invention, the cross-sectional outer circumference of the rubber material having a circular cross-section is
By surrounding more than half of the groove with the inner wall surface, deformation of the rubber material in the direction perpendicular to the paper clamping direction is prevented, and the efficiency of transmitting the clamping force from the clamper to the paper is improved.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the main parts of a paper clamp device according to an embodiment of the present invention, FIG. 2 is a configuration diagram showing the main parts of a printer having the device in the first section, and FIG. It is a sectional view of a main part of the device, and the same or equivalent parts as in FIG. 4 are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, reference numeral (21) indicates a pair of clampers having an upper clamper (22) and a lower clamper (23), and the upper clamper (22) has a stopper (22a) at the leading end of the paper (6). is provided, and the lower clamper (
23) is provided with a arm (23a) having an arcuate cross section extending in the width direction of the paper (6).
2) Upper and lower paper guide surfaces (22b) and (23b) are provided at the leading ends of paper sheets 2) and 23, respectively.

(24) is a rubber material made of silicone rubber with a circular cross section that is press-fitted and fixed in the groove (23a).
It is surrounded by the inner wall surface of 23a), and only the remaining part is exposed.

The paper clamping device of this embodiment also includes a pair of clampers (21), a rubber material (24), and a conventional spring (9).
, a clamper opening/closing mechanism (not shown), a clamper moving means (not shown), and the like.

In a printer having a paper clamp device configured as described above, the paper (6) is conveyed and a printing operation is performed in the same manner as in the conventional printer.

At this time, most of the cross-sectional outer periphery of the rubber material (24) of this embodiment is surrounded by the inner wall surface of /11 (23a), so that the portion within this groove (23a) cannot be deformed. Therefore, even if a pressing force is applied by the spring (9),
The rubber material (24) is perpendicular to the pressing force (left and right direction in the figure)
Therefore, the pressing force from the clamper (21) is efficiently transmitted to the paper (6), and the holding force for the paper (6) becomes greater than before. Furthermore, since only a part of the outer periphery of the rubber material (24) with a circular cross section was exposed, the paper (6
) becomes smaller, and as a result, the holding force becomes uniform, and the exposed portion of the rubber material (24) hardly deforms in the left-right direction in Figure 3. Therefore, due to the deformation of the rubber material (24), There is no possibility that the paper (6) will shift to the right in FIG.

As a result, in the paper clamping device of this embodiment, paper misalignment is prevented, printing misalignment due to paper misalignment is prevented, and printing quality is improved. Also, due to paper misalignment, paper (6
) is also prevented from forming wrinkles.

Further, in the above embodiment, since the rubber material (24) is press-fitted into the arm (23a), the trouble of adhesion can be omitted, and the rubber material (24) can be easily fixed.

Furthermore, in the above embodiment, each clamper (22), (23
) on each paper guide surface (2Zb) (
23b), the leading end of the paper (6) can be smoothly guided to the nipping position.

In addition, in the above embodiment, 75 of the cross-sectional outer circumference of the rubber material (24)
Although approximately 50% of the groove (23a) is surrounded by the inner wall surface of the groove (23a), a certain degree of effect can be obtained by surrounding 50% or more, that is, more than half of the groove. However, it is preferable to surround it by about 60 to 80%.

Further, in the above embodiment, the rubber material (24) is made of silicone rubber, but it may be made of other rubber.

Further, in the above embodiment, the rubber material (24) is provided on the lower clamper (23), but the rubber material (24) may be provided on the upper damper (22) or both, and the number thereof is not limited.

Furthermore, in the above embodiment, the rubber material (24) is press-fitted into the lower clamper (23) and fixed therein, but it may be fixed with an adhesive.

Further, although it is preferable that the cross-sectional shape of the rubber material (24) be completely circular from the viewpoint of processing, it is also possible to have an elliptical shape to some extent, and it goes without saying that the same effect can be obtained.

Further, the structure of the parts other than the rubber material (24) and the armature (23a) can be modified and changed to a certain degree, and is not limited to the above embodiment.

[Effects of the Invention] As explained above, the paper clamp device of the present invention has the following advantages:
A groove with an arcuate cross section extending in the width direction of the paper is provided in the paper holding part of the clamper, and a rubber material with a circular cross section is fixed within this groove.
In addition, since more than half of the outer circumference of the cross-section of the rubber material is surrounded by the inner wall surface of the groove, deformation of the rubber material in the direction perpendicular to the paper clamping direction is prevented, thereby efficiently transmitting the clamping force from the clamper to the paper. It is possible to increase the holding force against the paper. Therefore, it is possible to prevent paper misalignment, and also prevent printing misalignment due to paper misalignment.
As a result, printing quality can be improved, and the occurrence of paper wrinkles due to paper misalignment can also be prevented, and as a result, the reliability of the printer can be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a configuration diagram showing a printer having the device shown in FIG. 1, FIG. 3 is a sectional view of the main part of FIG. Block diagram showing an example, No. 5
The figure is a sectional view of the main part of FIG. 4. In the figure, (6) is paper, (21) is a pair of clampers, (23m) is a groove, and is a rubber material. In addition, in each figure. The same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A pair of clampers are provided in the printer to clamp and convey paper, and a groove having an arcuate cross section extending in the width direction of the paper is provided in the paper clamping part, and a pair of clampers are fixed in the groove. A paper clamp device comprising a rubber member having a circular cross section, and more than half of the outer periphery of the cross section of the rubber member is surrounded by the inner wall surface of the groove.