JPH0646695Y2 - Paper guide device for printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a paper guide device for guiding a paper by a paper pan curved along a platen in a printing machine such as a typewriter or a printer.

"Prior Art" A conventional paper guide device of this type, as disclosed in, for example, Japanese Utility Model Publication No. 48-15137, allows a paper pan to swing freely on a main frame via a dedicated support member. I was supporting.

"Problems to be solved by the invention" In such a bearing structure, the structure is complicated, the number of parts is large, the cost is high, and the size is large.

SUMMARY OF THE INVENTION The present invention is intended to allow a paper pan to be swingably supported with a very simple structure without using a dedicated support member.

[Means for Solving Problems] Therefore, in order to achieve such an object, the present invention provides a paper pan 6 with a front portion curved along the platen 1.
11 and a substantially horizontal rear part 12 are provided. The central portion of the lower surface of the rear side portion 12 is connected to the rear plate 7 of the main frame 3.
It is joined to an arcuate projection 8 provided at the center of the upper edge of the paper pan 6 and is urged downward by a spring 16, so that the left and right side portions of the paper pan 6 are vertically moved around the arcuate projection 8. It can be freely swung. Further, left and right swing guide portions 9 and 10 for guiding swing of the left and right side portions of the paper pan 6 are provided at both left and right ends of the rear plate 7 of the paper pan 6.

"Action" Therefore, the paper pan is directly supported on the main frame, and it is urged by the spring and the main frame, even though the central part of its lower surface is simply joined to the arcuate projection of the main frame. The swing guide portion prevents it from coming off the main frame.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1 (right side view), FIG. 2 (plan view) and FIG. 3 (left side view), the platen 1 is rotatable between the left and right side plates 4 and 5 of the main frame 3 by its platen shaft 2. Further, the paper pan 6 is directly supported on the rear plate 7 of the main frame 3 as follows.

That is, on the upper edge of the rear plate 7 of the main frame 3, as shown in FIG. 4 (rear view), an arcuate projection 8 is formed at the center and swing guide projections (swing guides) are provided at both left and right ends. 9,10 are projected integrally. On the other hand, the paper pan 6 has a front portion 11 that is curved along the platen 1 and a rear portion 12 that is substantially horizontal.
And then the hanging part 13 that folds downward from the edge,
Holes 14 and grooves 15 for rocking guide are provided at both left and right ends of the rear portion 12.
Is provided. In the paper pan 6, the lower surface central portion of the rear side portion 12 is simply joined to the arcuate projection 8 of the main frame 3, and the swing guide holes 14 and grooves 15 are formed on the left and right sides of the main frame 3. A spring 16 is stretched between the center of the hanging portion 13 and the rear plate 7 of the main frame 3 in a state of being fitted in the swing guide protrusions 9 and 10 so as to be vertically slidable, thereby forming an arc shape. The protrusion 8 is supported so as to be swingable up and down and back and forth. The vertical swing of the left and right side portions is guided by the swing guide protrusions 9 and 10, and the vertical swing of a predetermined amount or more is performed by the step portions 9a and 10a lower than the swing guide protrusions 9 and 10 of the rear plate 7. Regulated.

In addition, the swing guide of the paper pan 6 includes a part thereof and the rear plate 7.
It is possible as long as it is configured to engage with part of the upper edge of
The structure is not limited to the above.

A paper release lever 17 is rotatably supported at the left end of the platen shaft 2 so that the paper release lever 17 is tilted to the front side as shown by a chain line in FIG. 3, and its lower end is shown by a chain line in FIG. Paper pan 6 by part 18
The front half portion 12 of the plate is pushed down against the spring 16 and the gap with the platen 1 is widened. At this time, the paper feed roller 6a also separates from the platen 1.

On the other hand, the platen gear 19 fixed to the right end of the platen shaft 2 has the intermediate small gear 20 inside the right side plate 5.
Meshes with. The intermediate small gear 20 is integrated with the intermediate large gear 21 as shown in FIG. 5, and is rotatably supported by a short shaft 22. The shaft 22 is a plate-shaped shaft fixing member attached to the outer surface of the right side plate 5.
The base end 22a is fixed to the upper end of 23 by, for example, caulking, and protrudes inward from a hole 24 formed in the side plate 5. The intermediate large gear 21 is meshed with a motor gear 26 of a line feed motor 25 attached to the outer surface of the side plate 5, and the rotation of the motor 25 is transmitted to the platen 1 at a reduced speed.

The shaft fixing member 23 is detachably attached to the outer surface of the side plate 5 by a screw 28 through an arcuate mounting hole 27 provided in the middle portion thereof, and the shaft 22 is provided with the arc length of the mounting hole 27.
It is attached so that it can be rotated slightly around the fulcrum. The lower end of the shaft fixing member 23 has a hook-shaped shaft hooking portion.
29 is formed, and the shaft hooking portion 29 hooks the right end portion of the guide shaft 31 that guides the sliding of the carrier 30 as follows.

That is, the right end portion of the guide shaft 31 is penetrated through the support hole 32 provided in the side plate 5, and then the shaft engaging portion 29 of the shaft fixing member 29 is inserted into the engaging annular groove 33 provided at the right end portion.
Are engaged with each other, and the screws 28 are tightened to maintain this fitted state, whereby the screw is prevented from being pulled out from the support hole 32.

The space motor 34 for sliding the carrier 30 is mounted on a motor base plate 35 which is separate from the main frame 3, and a drive pulley 36 is pivotally supported on the lower surface of the motor base plate 35. The rotation of the motor 34 is transmitted to the drive pulley 36 via an intermediate gear 37 which is integral with the drive pulley 36 and a motor gear 38 which meshes with the intermediate gear 37.

The motor base plate 35 is integrated with a rack 39 that meshes with a pinion (not shown) of a ribbon feeding mechanism mounted on the carrier 30. The motor base plate 35 is provided with two front and rear portions thereof, and the rack 39 is provided with slightly elongated oblong holes 40, 41 at its left end portion. The motor base plate 35 and the rack 39 are provided with these oblong holes 40, 41.
Through the screw 42, it is horizontally fixed on the left and right side plates 4 and 5 of the Mayframe 3, and the fixing position can be adjusted left and right by the length of the long holes 40 and 41.

The timing belt 43 connected to the carrier 30 is stretched between the drive pulley 36 and the guide pulley 44, and the carrier 30 slides when the space motor 34 is driven.
The guide pulley 44 is supported on the left side plate 4 of the main frame 3 as follows.

That is, as shown in FIGS. 3 and 6, the side plate 4 has upper and lower slits 45, 46 and a pulley window 47 in the middle thereof.
A pair of upper and lower curved bearing portions 48 is formed by bending an intermediate portion between the curved portions to the inside of the main frame 3. The guide pulley 44 has a part thereof protruding from the outside of the side plate 4 into the pulley window 47, and the upper and lower both side portions of the pulley shaft 49 are engaged with the pair of upper and lower curved bearing portions 48, and the engagement state is timed. The belt 43 is rotatably and detachably supported on the side plate 4 only by being held by the tension of the belt 43. The tension of the timing belt 43 can be adjusted by changing the fixed positions of the motor base plate 35 and the rack 39 as described above.

As shown in FIG. 7, the shaft fixing member 23 has a hook-shaped shaft hooking portion 29 not only at its lower end but also at its upper end.
Alternatively, the platen shaft 2 may be provided with a and the platen shaft 2 may be engaged with the shaft engaging portion 29a similarly to the guide shaft 31.

[Advantage of Invention] According to the present invention, since the paper pan can be directly supported without using a dedicated support member as in the past, the configuration is extremely simple, the assembly is easy and the manufacturing cost is low, and the size is small. Can be realized.

Further, particularly in the present invention, the paper pan is provided with a substantially horizontal rear portion, and the central portion of the lower surface thereof is joined to the arc-shaped projection provided at the center of the upper edge of the rear plate of the main frame, and the arc-shaped projection is formed. Since it is possible to swing the left and right side portions of the paper pan by point contact with the protrusion, it is possible to prevent occurrence of so-called one-sided contact such that the manufacturing dimensions of the paper pan do not match and one side of the platen is hit, for example. And so on, the practical effect is great.

[Brief description of drawings]

FIGS. 1, 2 and 3 are a right side view, a partially cutaway plan view and a left side view of an embodiment of the present invention, and FIG. 4 is a partially cutaway rear view of the main frame and the paper pan, FIG. 5 is a sectional view showing a mounted state of the shaft fixing member and a shaft fixed state resulting therefrom, and FIG. 6 is an enlarged sectional view taken along line I-I of FIG. FIG. 7 is a right side view showing another example of the shaft fixing member. 1 ... Platen, 3 ... Main frame, 6 ... Paper pan, 7 ... Rear plate, 8 ... Arc-shaped projection, 9, 10 ... Swing guide projection, 16 ... Spring.

Claims (1)

[Scope of utility model registration request] 1. A platen 1 axially mounted on a main frame 3.
In the paper guide device of the printing machine, in which the paper pan 6 curved along the lower side of the paper pan 6 is provided.
Is provided with a front side portion 11 that curves along the platen 1 and a substantially horizontal rear side portion 12, and the center of the lower surface of the rear side portion 12 is the center of the upper edge of the rear plate 7 of the main frame 3. It is joined to the arc-shaped projection 8 provided on the above and is urged downward by the spring 16, so that the left and right side portions of the paper pan 6 can be vertically swung about the arc-shaped projection 8. ,
Further, a paper guide device for a printing machine, characterized in that left and right swing guide portions 9 and 10 for guiding the swing are provided at both left and right end portions of the rear plate 7.