JP2636235B2 - Printer paper regulation mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sheet regulating mechanism for guiding a sheet to a predetermined position when a sheet is loaded in a printing mechanism.

(Prior art) When setting cut paper in a printer,
In a state in which one end of the paper is aligned with one of the right and left reference positions of the printer body, an operation of rotating the platen so that the paper faces the print head is required, and there is a problem that the work of positioning the paper is complicated. .

In order to solve such a problem, a paper regulating mechanism for guiding the paper is provided at the upper part of the printer apparatus body, and when the lower end of the paper enters between the platen and the paper guide plate, the platen is automatically moved to a predetermined amount. There has been proposed a printer which is rotated to set a sheet at a predetermined position.

By the way, since there are various sizes of paper used for printing, it is necessary to make at least one of the paper guide plates movable so as to be able to cope with this.
For this reason, a paper regulating mechanism is generally used in which a paper width determining member is movably provided in a paper guide plate main body that guides the paper to a platen, but there is play between the guide plate and the width determining member. Therefore, there is a problem that the positioning accuracy of the sheet is low.

Of course, in order to solve such a problem, it is conceivable to interpose an elastic member between the guide plate and the width determining member to absorb the backlash, but it is necessary to attach the elastic member and the number of parts is reduced. There is a problem that the number of assembling steps is increased.

(Object) The present invention has been made in view of such circumstances, and an object of the present invention is to provide a paper regulating mechanism having a simple structure and high positioning accuracy.

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

FIG. 1 shows an embodiment of the present invention. In the drawing, reference numeral 1 denotes a plate-like body adapted to a maximum printable paper width of a printer P by a paper regulating mechanism characterized by the present invention. A plurality of grooves 16, 16, 16 ‥‥ parallel to the oblique direction are formed on the surface side in contact with the paper surface, and the paper guide plate 10 and the paper width slidably mounted in the horizontal direction. Deciding member 20, 20 '
And is detachably mounted on the printer main body P by feet 11, 11 formed below the paper guide plate 10.

FIG. 2 shows an embodiment of the above-described paper guide plate. On the back surface, a convex portion 12 which comes into contact with paper width determining members 20, 20 'described later is formed in parallel with the width direction. Above this, an engaging portion 13 for positioning one end of the sheet at a reference position of the printer is formed. This ridge 12
Is formed with a slope 14 which is chamfered at its end and faces obliquely upward.

As shown in FIG. 3, the locking portion 13 is formed in a trapezoidal shape having slopes 13a, 13a and a flat portion 13b therebetween in the moving direction of the sheet width determining member, and a concave portion 13c is formed in the flat portion 13b. It is formed and formed.

FIG. 4 shows an embodiment of the above-mentioned paper width determining member 20 (20 '), in which bent portions 21, 22, 23, and 24 having the thickness of the paper guide plate 10 are formed on the upper side and the lower side. On the side that is formed on the side, and on the side that becomes the surface, a guide portion 25 whose upper part is expanded is formed. The bent portion on the upper side is divided into three, and when attached to the guide plate 10 at both ends 21 and 22,
The slopes 26 and 27 that elastically abut the guide ridge 12 are formed, and the projections 28 are formed in the central bent portion 23 at positions where they contact the recesses 13c. On the other hand, the bent portion 24 formed at the lower portion of the sheet width determining member faces the rear surface of the guide plate when guided by the ridge 12,
When the width determining member is pressed and the slope 14 is climbed, the locking portions 29, 29 are formed below the lower surface 15 of the guide plate 10.

On the other hand, the second paper width determining member 20 ′ whose position is adjusted according to the width of the paper is configured to be symmetrical to the first paper width determining member 20 described above.

In this embodiment, the upper bent portions 26 to 27 are inserted from the upper end of the paper guide plate 10 so that the guide portions 25, 25 'of the respective paper width determining members 20, 20' face each other, and When the determining members 20, 20 'are further pushed in when they come into contact with the ridges 12 of the guide plate 10, the bent portions 26, 27 get over the ridges 12 (FIG. 5I). When the lower portion of the sheet width determining member 20 is moved upward while pressing the surface of the guide plate 10 in this state, the slopes 26 and 27 of the sheet width determining member 20 abut against the slope 14 of the ridge portion 12, and Further, the lower projections 29, 29 hold the lower end 15 of the guide plate 10, and are prevented from falling off from the guide plate 10 (FIG. II in the figure).

In such a state, the sheet width determining member serving as the reference example
When the reference numeral 20 (the one on the left side in FIG. 1) is moved toward the reference position, the central bent portion 23 becomes the slope 13 c of the locking portion 13.
And fall on the flat portion 13b and fall into the concave portion 13c, thereby giving resistance to the movement.

In this state, the bent portion 23 at the center loses its elastic force and becomes free because the projection 28 has fallen into the concave portion 13c, so that no force is applied to the sheet width determining member 20.

On the other hand, the two bent portions 21 and 22 on both sides cause the reaction force F obliquely upward on the back surface from the slope 14 of the ridge 12 due to its elastic deformation.
Then, both sides of the sheet width determining member 20 are lifted upward (F ₁ ) and are attracted to the surface of the sheet guide plate 10 (F ₂ ). As a result, the width determining member 20 is elastically fixed at the reference position at the position determined by the surface of the guide plate 10 and the protruding ridges 12, thereby preventing rattling.

When the position of the first guide member 20 is determined in this way, the second sheet width determining member 20 'is moved to the left and right in accordance with the width of the sheet to be printed, and positioned at a predetermined position. And the sheet width determining member 20 '
Similar to 20, the ridge 12 moves smoothly while being elastically pushed upward by the force (F) from the slope 14 of the ridge 12.
In the course of this movement, the paper width determining member 20 ′ moves in contact with the paper guide plate 10 whose surface contact area is reduced by the grooves 16, 16, 16. It will be prevented as much as possible.

When the sheet is inserted from above at the stage when the setting of the sheet width determining members 20, 20 'is completed, the sheet is inserted into the guide plate 10 on the back side and the guide portions 25, 25' of the side ends on the width determining members 20, 20 '. And slips into a predetermined position by its own weight. In the process of sliding, grooves 16 and 16 are formed on the surface of the paper guide plate.
Although there are irregularities due to 16 ..., since they are formed obliquely, there is no hiccal.

When disassembly is required for cleaning or the like, the upper ends of the sheet width determining members 20 and 20 'are pushed down, and the bent portions 21 and 22 at both ends have the slopes 26 and 27 at the guide ridges. Department
Elastically deforms outwardly along the slope 14 of FIG. 12 to get over the guide ridge (FIG. 5I). With this, the paper width determining member
The projections 20 and 20 'relatively approach the upper end 17 of the guide plate 10, and the projections 29 and 29 below the sheet width determining members 20 and 20' are located below the lower end 15 of the guide plate 10. In this state, the sheet width determining members 20, 20 'can be removed by lifting them upward from the lower side.

FIG. 6 shows another embodiment of the sheet width determining member. In the drawing, reference numerals 30 and 30 'denote sheet width determining members for guiding the left end and the right end of the sheet, respectively. When the distance is adjusted, the distance L between the inner surfaces of the two guide portions 31 and 31 'is selected to have a size corresponding to the width of the fixed-form card K such as a postcard, and a finger can be inserted into the opposing surface side. Notches 32, 32 'are formed so as to form a long hole.

In this embodiment, the paper width determining members 30, 30 'are mounted on the paper guide plate 10 by the same process as described above, and the left end paper width determining member 30 is fixed at the printing reference position. The sheet width determining member 30 'on the right side is pulled to the left side to bring them into contact. Thereby, the guide portions 31 on both sides,
31 'makes the inner distance L coincide with the width of the card. If the card K is dropped from the upper part in this state, the card K comes into contact with its platen at its leading end and stops until it falls to a prescribed position, that is, a position where the platen can hold the card. At this stage, the card is pushed into the specified position by inserting the finger A into the elongated hole 33 formed by the cutouts 32, 32 'of the guide plate and pushing the upper end of the card K downward.

(Effects) As described above, in the present invention, the plate body adapted to the printing width of the printer has, on the non-contact surface of the paper, an inclined surface extending in the paper width direction and having a cross section whose upper side is a short side. A paper guide plate formed with a ridge and a bent portion having a thickness of the paper guide plate were formed on an upper side and a lower side, and a guide portion which expands upward was formed on an upper portion on a paper loading side. The paper width determining member has an upper bent portion that is at least divided into two portions, and the upper bent portion has a slope of a ridge portion when mounted on a paper guide plate. The upper surface of the paper guide plate is elastically abutted, and a sloping surface that rides on the slope of the ridge portion is formed when pressed against the upper end of the paper guide plate. The lower bent portion is guided along the slope of the ridge portion. In the state where the paper guide plate is in contact with the back of the paper guide plate, In addition, when the paper guide plate is pressed against the upper end of the paper guide plate, a locking portion located below the lower surface of the paper guide plate is formed, so that the paper width determining member can be guided by the paper guide member without requiring a special elastic member. It is elastically attached to the plate to prevent backlash, and can be easily attached and detached by pressing the paper width determining member downward, so that assembly and disassembly operations can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a printer to which one embodiment of the present invention is applied, and FIGS. 2A and 2B are cross-sectional views showing one embodiment of a guide plate in the same device. FIG. 3 is an enlarged view showing an embodiment of a locking portion in FIG. 2, and FIGS. 4A and 4B are a cross-sectional view and a rear view showing an embodiment of a sheet width determining member. FIG. 5 is a cross-sectional view showing the operation of the above device, and FIGS. 6 and 7 are a front view showing another embodiment of the present invention and an explanatory diagram showing a use state. 10 paper guide plate, 11 feet 12 ridge, 13 locking part 14 slope, 20 paper width determining member 21-24 bending part 26, 27 slope , 28 ... Projection 29 ... Projection, P ... Printer body

Claims (1)

(57) [Claims] A sheet guide having a plate extending in the sheet width direction and having a slope having a cross section having a short side as an upper side is formed on a non-contact surface of a sheet of a plate body adapted to a printing width of a printer. And a sheet width determining member having a bent portion having a thickness of the sheet guide plate formed on an upper side and a lower side, and a guide section which expands upward at an upper portion on a sheet loading side. The paper width determining member has the upper bent portion divided into at least two portions, and the upper bent portion is formed on the inclined surface of the ridge portion when mounted on the paper guide plate. In a state in which it is elastically contacted and is pressed against the upper end of the paper guide plate, a slope is formed on the slope of the ridge so as to ride on the slope, and the lower bent portion is formed along the slope of the ridge. In the state where the paper guide plate is guided, A paper sheet regulating mechanism for preventing dropping from the paper guide plate, and having a locking portion formed below the lower surface of the paper guide plate when pressed against the upper end of the paper guide plate.