JPH0562074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device such as a typewriter having a cylindrical platen.

Conventional technology In recent years, printing devices such as typewriters, like other devices, have tended to be smaller and lighter to make them more portable.In order to fit these printing devices, paper feeding devices must also be made smaller. It is necessary to proceed with

A conventional paper feeding device will be described below.

The printing paper wrapped around the platen is pressed against it by a paper presser roller, and the printing paper is fed by rotating the platen. To adjust the position of the printing paper, the paper presser roller is moved away from the platen, and contact between the printing paper and the platen is cut off.

As a conventional technique, for example, Japanese Patent Application Laid-open No. 1983
No. 110278. The paper pressing roller is held between a pair of holding members, and the holding members are supported by a support member. The holding member is guided in vertical movement so as to straddle a shaft member provided in the longitudinal direction of the platen. Furthermore, a crank-shaped shaft member for releasing the paper is provided in the longitudinal direction of the platen, and a paper-pressing release lever is provided to release the paper.This crank-shaped shaft member is rotated to push down the support member against the force of the biasing spring, and to release the paper. Separate the presser roller from the platen.

Problems to be solved by the invention However, in the above configuration,
A holding member, a shaft member, and a crank-type shaft member are required, and the shaft has a large diameter because it receives a large paper pressing force, which hinders the reduction in size and weight of the entire apparatus.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a paper feeding device that is smaller and lighter overall.

Means for Solving the Problems In order to solve the above problems, the paper feeding device of the present invention includes a platen, a roller that presses and presses the printing paper wound around the platen, and a rotatable pivot for the roller. a guide member for introducing the printing paper along the platen; a machine frame; and a machine frame; the guide member is pivotally supported and is inserted into a through hole bored in the machine frame, and is rotatable about the through hole as a fulcrum. an elastic member that is stretched between the machine frame and the support member and applies a pressing force to the roller via the guide member; and an elastic member that contacts the support member and resists the biasing force of the elastic member. and a release member that pushes down the support member and releases the pressure contact of the roller.

Function The present invention has the above-described configuration, and the guide member holds the roller, and the guide member is pivotally supported on the support member so that the roller appropriately presses the printing paper wound around the platen. The support member is rotatably directly supported by a through hole formed in the machine frame, and the roller presses the printing paper through the guide member due to the biasing force of the elastic member. The position of the print paper can be adjusted by driving the release member, directly pushing down the support member with the release member, and separating the roller from the print paper.

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

FIG. 1 shows a perspective view of essential parts of a paper feeding device in an embodiment of the present invention.

1 is a platen, 2 and 3 are platen shafts, 4 is a machine frame, 5 is a bearing hole, 6 is a paper press release lever,
Reference numeral 6a denotes a hole provided in the paper presser release lever 6. The platen shaft 2 is pivotally connected to the bearing hole 5, and the platen shaft 3 is pivotally connected to the bearing hole and hole 6 (not shown) provided in the machine frame. It is locked to the machine frame 4.

Figure 2 is a sectional view of the main parts of the paper feeding device in Figure 1;
1 is a perspective view of a typewriter constructed using the paper feeding device shown in FIG. 1.

Reference numeral 7 denotes a type wheel with type letters arranged at the tips of a large number of spoke pieces, and 8 a hammer solenoid, which hits the type characters from the back side of the spoke pieces onto a printing paper 10 via a print ribbon 9 to print. A platen rotation mechanism (not shown) is attached to the leftmost end of the platen shaft 2, and after printing is performed, the platen 1 is rotated as necessary to feed the printing paper 10.

11 is a paper press roller, 12 is a paper press roller 11
The shaft portion 11a of the roller 11 is fitted into the groove portion 12a of the guide member 12.

Reference numeral 13 denotes a support member, which is connected to the slit hole 4a of the machine frame 4.
The spring 1 is stretched between the spring hook 4b of the machine frame 4 and the spring hook 13b of the support member 13.
4 biases vertically upward. The support member 13 is provided with a groove portion 13c, and the engaging portion 12b of the guide member 12 is provided with a groove portion 13c.
is supported. The support member 13 is further provided with a pressing portion 13d, which comes into contact with the cam portion 6b of the paper press release lever 6, and is pushed down by the rotation of the paper press release lever 6, causing the support member 13 to move around the slit hole portion 4a as a fulcrum. Rotate as.

The operation of the paper feeding device of this embodiment configured as described above will be described below. First, insert the printing paper 10 from the insertion part 12c of the guide member 12,
Wrap it around platen 1. At this time, printing paper 10
If the paper press release lever 6 is rotated in the direction of arrow A, the pressing portion 13d of the support member 13 is pushed by the cam portion 6b and rotates in the direction of arrow B. When the support member 13 rotates, the paper pressing roller 11 is pushed vertically downward via the guide member 12. In this state, the printing paper held between the platen 1 and the paper pressing roller 11 is explained, so that the distortion of the printing paper can be freely corrected.

After correcting the printing paper 10, press the paper presser release lever 6.
is rotated in the direction opposite to the arrow A, and the paper pressing roller 11 presses the printing paper 10 against the platen 1 in the reverse procedure to that described above.

As described above, according to this embodiment, the support member 13
is an integral part that pivotally supports the guide member 12 to which the paper presser roller 11 is pivotally attached, and the machine frame 4 is provided with a slit hole 4a that serves as a pivot point for the support member 13, and the support member 13 is directly connected to the paper presser release lever. 6, compared to conventional paper feeding devices, there is no need for a pair of holding members that hold the paper presser roller, and a shaft member that guides the holding members and a crank-type shaft member for releasing the paper are not required. is also unnecessary. Therefore, the structure is simple, the number of parts is small, and it is possible to achieve a reduction in size and weight.

In this embodiment, the spring 14 is a tension coil spring, but a compression coil spring or a plate spring that urges the bottom surface of the support member 13 upward may be fixed to the machine frame 4.

Effects of the Invention The present invention provides a torsion-resistant yet lightweight structure that does not require special members for the roller shaft, leaf spring, paper chute support shaft, paper chute stopper, post provided on the release shaft, and release lever support shaft. The U-shaped support member allows the guide member equipped with rollers to be evenly pushed up onto the platen, making it possible to construct a paper feeding device that is small, lightweight, and low-cost with fewer parts.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts of a paper feeding device in an embodiment of the present invention, FIG. 2 is a sectional view of essential parts showing some of the components of FIG. 1, and FIG. FIG. 3 is a perspective view of a typewriter configured with the paper feeding device of FIG. 2; 1...Platen, 2, 3...Platen shaft, 4...
... Machine frame, 5 ... Bearing hole, 6 ... Paper press release lever, 7 ... Type wheel, 8 ... Hammer solenoid, 9 ... Print ribbon, 10 ... Print paper,
11... Paper press roller, 12... Guide member, 13
...Supporting member, 14...Spring.

Claims (1)

[Claims] 1. A platen, a roller that presses and presses the printing paper wound around the platen, a guide member that is rotatably pivotally connected to the roller and introduces the printing paper along the platen, a machine frame, and the guide. a substantially U-shaped support member that pivotally supports the member and is inserted into a through hole drilled in the machine frame and is rotatable about the through hole as a fulcrum; an elastic member for applying pressure contact force to the roller via a guide member; and an elastic member that contacts the support member and pushes down the support member against the biasing force of the elastic member to release the pressure contact of the roller and press the platen. A paper feeding device comprising a release member attached to a support shaft.