JPS6032684A - Paper feed apparatus - Google Patents

Abstract

PURPOSE:To provide a paper feed apparatus capable of miniaturizing the whole and reducing the weight thereof, constituted so as to push down a support member, which pivotally supports a holding member for pivotally mounting a paper bail roller, by a paper bail release lever by revolving said suport member around the through-hole of a machine frame. CONSTITUTION:In correcting the distortion of printing paper which is wound around a platen 1 by inserting the same from the insert part 13b of a peper guide 13, a release lever 7 is rotated to a direction shown by the arrow A. The dowel part 11d of a support angle 11 is pushed by the cam part 7a thereof to be revolved to a direction shown by the arrow B and a paper bail roller 8 is pushed down to a vertical downward direction through a holding plate 9 to release the printing paper held between the platen 1 and the roller 8. After the printing paper is corrected, the lever 7 is revolved to the direction opposite to the arrow A and printing paper is contacted with the platen 1 by the roller 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 2 /ζ-J The present invention relates to a paper feeding device such as a typewriter having a cylindrical platen.

Conventional configurations and problems In recent years, printing devices such as typewriters, like other devices, have tended to be smaller and lighter to make them more portable. It is also necessary to promote miniaturization.

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 the printing paper and the platen are no longer in contact with each other.

The paper pressing roller is held between a pair of holding members, and the holding members are supported by a support member. The support member is provided with a first shaft provided in the longitudinal direction of the platen as a pivot point.

Similarly, a second shaft is provided in the longitudinal direction of the platen, a driving member is attached to this, and the second shaft is
The drive member is rotated through the shaft of the drive member, and the drive member pushes down the support member against the force of the biasing spring 3, thereby separating the paper pressing roller from the platen.

However, in the above configuration, the first . A second shaft is required, and because it receives a large paper pressing force, the shaft has a large diameter, which hinders miniaturization and weight reduction of the entire apparatus.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a paper feeding device that is compact and quantifiable as a whole.

Structure of the Invention The paper feeding device of the present invention includes a platen, a paper press roller that presses and presses the printing paper wound around the platen, a pair of holding members that rotatably pivot the paper press roller, and a mechanism. a frame, a support member that is inserted into a through hole drilled in the machine frame and rotates about the through hole as a fulcrum to pivotally support the holding member; and a support member that is stretched between the machine frame and the support member and said paper. an elastic member for applying a pressing force to the presser roller; and a paper presser release lever that contacts the support member and pushes down the support member against the biasing force of the elastic member to release the pressurizer from the paper presser roller. This configuration realizes a small and lightweight paper feeding device.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The drawing shows a perspective view of essential parts of a paper feeding device according to an embodiment of the present invention.

1 is a platen, 2 and 3 are platen shafts, 4 and 5 are bearings, and 6 is a machine frame.The platen shafts 2 and 3 are pivotally attached to the bearings 4 and 6, and are locked to the machine frame 6. The bearing 5 is provided with a paper presser release lever 7, which is operated when holding and releasing the illustrated printing paper wrapped around the platen 1. Furthermore, a platen rotation mechanism (not shown) is attached to the rightmost end of the platen shaft 3, and after printing is performed by a printing mechanism (not shown), the platen 1 is rotated as necessary to feed the printing paper.

8 is a paper press roller; 9 is a pair of holding plates that hold and hold the paper press roller 8; 1o is a shaft protruding from the holding plate 9; 11
is a support angle, and the U-shaped groove 11 of the support angle 11
A shaft 10 is pivotally supported on a.

The support angle 11 has a protrusion 1 in the slit hole 6a of the machine frame 6.
1b, and connect the spring hook 6b of the machine frame 6 and the support angle 1.
A spring 12 stretched over the spring hanging portion 11C of 1 biases the spring 12 vertically upward. The support angle 11 is further provided with a dowel portion 11d, which comes into contact with the cam portion 7a of the paper press release lever 7.
It is pushed down by the operation of the paper presser release lever 7, and the support angle 11 rotates about the slit hole portion 6a as a fulcrum.

A paper guide 13 has a retaining portion 13& that engages with the shaft 10, and forms a path for printing paper between the platen 1 and the paper pressing row 28.

The operation of the paper feeding device of this embodiment configured as described above will be described below. First, printing paper is inserted through the insertion portion 13b of the paper guide 13 and wound around the platen 1. At this time, if the printing paper is twisted and wrapped,
When the paper press release lever 7 is rotated in the direction of arrow B, the dowel portion 11d of the support angle 11 is pushed by the cam portion 7a and rotated in the direction of arrow B. When the support angle 11 rotates, the paper pressing roller 8 is pushed vertically downward via the holding plate 9. In this state, the printing paper held between the platen 1 and the paper presser roller 8 is released, so that the distortion of the printing paper can be freely corrected.

After correcting the printing paper, the paper presser release lever 7 is rotated in the opposite direction to the arrow, and the paper presser row 28 presses the printing paper against the platen 1 in the reverse procedure.

As described above, according to this embodiment, the support angle 11 is
The pair of holding plates 9, 9 are integrally supported, and the machine frame 6 is provided with a slit hole 62L that serves as a rotational fulcrum for the support angle, so that the support angle 11 is directly pushed by the paper presser release lever 7. Compared to the conventional paper feeding device, the number of support angles is reduced from two to one, the rotation support shaft of the support angle is eliminated, and the driving member and its support shaft for pushing down the support angle are also eliminated. Therefore, the structure is simple, the number of parts is small, and it is possible to achieve a reduction in size and weight.

Effects of the Invention The present invention provides a support member for pivotally supporting the holding member to which the paper presser row 2 is pivotally attached, and is configured to rotate around a through hole bored in the machine frame as a fulcrum, and moreover, the paper presser row is released. Since the supporting member is directly pushed down by the lever, the number of parts of the paper feeding device can be reduced, and the paper feeding device can be made smaller and lighter. In other words, an excellent effect can be obtained in that the entire printing device can be made smaller.

[Brief explanation of drawings]

The drawing is a perspective view of essential parts of a paper feeding device in an embodiment of the present invention. 1...Platen, 2, 3...Platen shaft, 4゜6...Bearing, 6...Machine frame, 7
...Paper press release lever, 8...Paper press roller, 9...Holding plate, 10...Shaft,
11...Support angle, 12...Spring, 13...Paper guide.

Claims (2)

[Claims] (1) A platen, a paper press roller that presses and presses the printing paper wound around the platen, a pair of holding members to which the paper press roller is rotatably pivotally mounted, a machine frame, and a hole drilled in the machine frame. a support member that is inserted into the provided through-hole and rotates about the through-hole as a fulcrum to pivotally support the holding member; and a reservoir that is stretched between the machine frame and the support member and applies a pressing force to the paper pressing roller. and a paper press release lever that contacts the support member and pushes down the support member against the biasing force of the elastic member to release the paper press roller from pressure contact. (2) The paper feeding device according to claim 1, wherein a pivot shaft is provided protrudingly on the holding member, and the pivot shaft is fitted into a U-shaped groove provided on the support member.