JPS6232863Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a feed roller for a typewriter.

[Conventional technology]

A typewriter is provided with a feed roller to reliably press the paper to be printed against the platen. The feed rollers of conventional typewriters include a front feed roller row consisting of a plurality of rollers arranged on the same axis, and a rear feed roller consisting of a plurality of rollers arranged on an axis parallel to the front feed roller row. Two sets of feed roller assemblies each having an arm that pivotally supports both ends of the rotating shaft of these roller rows are arranged in parallel in the axial direction of the platen, and the feed roller assemblies of each roller row are arranged in parallel in the axial direction of the platen. An elastic member is provided on each of the four arms that pivotally support the rotating shaft,
The urging force of this elastic member presses the roller toward the platen.

[Problem that the invention attempts to solve]

In the typewriter's feed roller, it is necessary that the pressing force of the feed roller against the platen be uniform in order to prevent the paper from twisting during paper feeding, but conventional typewriters have four feed rollers as described above. Since each arm is provided with an elastic member, the pressing force of the feed roller is adjusted based on one elastic member, and the other three elastic members are adjusted so that the elastic force of the one elastic member is equal to the elastic force of the one elastic member. This adjustment was troublesome. In addition, when loading paper into the typewriter, it is necessary to set off the feed roller and move it away from the platen, but in conventional typewriters, this set-off mechanism is directly connected to each arm from the operating rod. Since it is a mechanism for swinging, it has the disadvantage that the structure is complicated.

Also, prior art (Utility Model Publication No. 42-2966, Japanese Unexamined Patent Publication No. 42-2966,
No. 51-100814), a connecting rod connecting arms that pivotally support both ends of the rotating shaft of the feed roller is pivoted to a swinging lever biased by a spring, and thereby the feed roller is moved relative to the platen. There is something that separates them. At this time, since the feed roller assembly consisting of the feed roller, rotating shaft, arm, and connecting rod moves toward and away from each other, guides must be provided at both ends of the typewriter frame to guide the toward and away movements of the feed roller assembly. In addition, the portion of the feed roller assembly that moves toward and away from the feed roller assembly becomes large in size.

The present invention was made in order to eliminate the drawbacks of the conventional typewriter feed roller, and provides a typewriter feed roller in which the pressing force of the feed roller against the platen can be easily adjusted and the feed roller set-off mechanism is simple. The purpose of this invention is to reduce the size of the approaching/separating motion feed roller assembly.

[Means for solving problems]

In the present invention, a first roller row is made up of a plurality of rollers arranged on a first rotation axis, and a first roller row is made up of a plurality of rollers arranged on a second rotation axis parallel to the first roller row. 2 roller rows, an arm that pivotally supports both ends of the rotating shafts of the first and second roller rows and has a longitudinally long elongated hole in the middle;
and a connecting rod arranged parallel to the rotation axis of the second roller row and having both ends attached to the arms;
a plurality of feed roller assemblies arranged in parallel at positions where they can contact a platen pivotally supported on a typewriter frame; a swinging lever provided at the rear end with an elastic member that pivots and urges the tip toward the platen; It has a diameter that passes through the hole and is in close contact with the left and right inner sides of the elongated hole, and is rotated while being pressed against the side edge of the platen near the tip of the swinging lever, so that the tip of the swinging lever is moved to the side of the elastic member. an actuating rod having a circular arc surface that swings in a direction away from the platen against an urging force and a flat cut surface that swings in a direction toward the platen, formed at a portion that penetrates the elongated hole. It is characterized by

[Effect]

In the typewriter feed roller according to the present invention, a connecting rod is provided between each arm of the assembly, and each assembly is provided with a swinging lever that is pivotally supported by the connecting rod at a central position in the roller axis direction of the feed roller assembly. Since this swing lever is provided with an elastic member that presses one end of the swing lever toward the platen side, two elastic members are used, and as a result, adjustment of the pressing force of the elastic member becomes extremely easy.
Further, in the typewriter feed roller according to the present invention, the feed roller is set off by pivoting the actuating rod, which has a flat surface that comes into contact with the swing lever, on the typewriter frame and rotating the actuating rod. Since the feed roller is set off against the urging force of the elastic member, the set off mechanism is also extremely simple.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a typewriter feed roller according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a plan view of a feed roller of a typewriter according to the present invention. In FIG. 1, side frames 10 and 12 are shown, and these side frames 10 and 12 are connected by a pipe frame 14 having a rectangular cross section. The side frames 10 and 12 are provided with actuating rods 16, which will be described later.
is rotatably attached.

In Figure 1, two sets of feed roller assemblies 1
8 and 20 are shown, the feed roller assemblies 18 and 20 being arranged in parallel in the axial direction of the platen. To explain the structure of the feed roller assemblies 18 and 20, the front feed roller row includes three small diameter rollers 22,
22, 22, and a rotating shaft 24 to which this small diameter roller 22 is attached. In addition, the rear feed roller row includes three large diameter rollers 26, 26,
26, and a rotating shaft 28 to which the roller 26 is attached. Both ends of the rotation shaft 24 of the front feed roller row and the rotation shaft 28 of the rear feed roller row are rotatably attached to arms 30 and 32. Therefore, roller 2
2 and 26 are rotatably attached to arms 30 and 32. Furthermore, arm 30,
A connecting rod 34 is attached to the central portion of 32, so that the arms 30 and 32 are connected by this rod 34. 1st
As shown in the figure, the rotation shaft 24 is attached to the arms 30, 32 parallel to the rotation axis 28, and the connecting rod 34 is attached to the arms 30, 32 parallel to the rotation axis 24, 28. There is. The feed roller assembly described above consists of two sets of feed roller assemblies 1 having exactly the same configuration.
8 and 20 are arranged in parallel as shown in the figure.

FIG. 2 is an enlarged sectional view taken along the line - in FIG. 1. As shown in FIG. 2, an elongated hole 36 is formed in the arm 30, into which the actuating rod 16 is inserted, so that the arm 30 is supported by the actuating rod 16. A long hole 36 is similarly formed in the other arm 32, and this long hole 3
An actuating rod 16 is inserted into the arm 6 to support the arm 32.

As shown in FIGS. 1 and 2, a support bracket 38 is fixed to the bottom surface of the pipe frame 14. Support bracket 38 as shown in FIG.
A projecting piece 40 is formed in the center of the projecting piece 40.
The actuating rod 16 passes through a hole 42 formed in the hole 42 . Furthermore, projections 44, 44 are formed on both sides of the support bracket 38. Swing levers 46, 46 are arranged at the center of the feed roller assemblies 18, 20 in the axial direction. As shown in FIG. 2, the swing lever 46 has one end 48 bent into a U-shape to form a groove 50.
A narrow diameter portion 52 formed at the axial center of the connecting rod 34 is fitted into the connecting rod 34. Therefore, one end 48 of the swing lever 46 is rotatably supported by the connecting rod 34. Furthermore, the swing lever 4
An opening 54 is formed in the center of the support bracket 6, and the protrusion 44 of the support bracket 38 is inserted into the opening 54.
is inserted, and the swing lever 46 can swing around point _P1 of the protrusion 44. A recess 56 is formed at the other end of the swing lever 46, and one end of a spring 58 is locked in the recess 56.
Although the other end of 8 is not shown, it is fixed to the frame side. The spring 58 urges the swinging lever 46 to rotate clockwise about point _P1 , and therefore the arm 30 connected to the swinging lever 46 through the narrow diameter portion 52 of the connecting rod 34 It is pressed toward the platen 59 by the elastic force of the spring 58. Recesses 56A and 56B are formed on both sides of the recess 56 in which one end of the spring 58 is locked, and the strength of the biasing force applied to the swing lever 46 can be adjusted by changing the locking part of the spring 58. It's getting old.

As shown in FIG. 2, in the actuating rod 16,
A flat cut surface 62 is formed on the side facing the upper edge 60 of the swing lever 46 . Therefore, when the actuating rod 16 is rotated as shown in FIG. 3, the cut surface 62 of the actuating rod 16 comes into contact with the upper edge 60 of the swinging lever 46, and the swinging lever 46 is rotated as shown in FIG. As shown, arm ₃ is pushed down centering against the urging force of spring 58, and as a result, arm 3
Rollers 20, 26 attached to 0, 32
moves away from the platen 59 and enters the set-off state.

Next, referring to FIG. 4, the rotation mechanism of the actuating rod 16 will be explained. As shown in FIG. 4, a lever 6 bent in a dogleg shape is attached to the side frame 12.
4 is attached to be swingable around a pin 66. A grip portion 68 is formed at the upper end of the lever 64, and a pin 70 is attached to the lower end of the lever 64. A link 7 is attached to the end of the actuating rod 16 on the side frame 12 side as shown in FIG.
The lower end of the link 72 is fixed, and a groove 74 bent in a dogleg shape is formed from the center to the upper part of the link 72, and the lower end of the lever 64 is attached within this groove 74. The pin 70 is fitted. Therefore, when the lever 64 and the link 72 are in the position shown by the solid line, the cut surface 62 of the actuating rod 16 fixed to the link 72 is separated from the upper edge 60 of the swing lever 46, as shown in FIG. However, when the lever 46 is rotated counterclockwise around the pin 66 and moved to the position shown by the two-dot chain line in the figure, the link 72 swings clockwise.
As shown in FIG. 3, the actuating rod 16 has its cut surface 62 inclined to push down the upper edge 60 of the swing lever 46 against the biasing force of the spring 58. At this time, a pin 70 attached to the lower end of the lever 64
slides within the groove 74 in the link 72 and moves to the position shown by the two-dot chain line. Since the groove 74 of the link 72 is bent into a dogleg shape at the position shown by the two-dot chain line of the pin 70, the pin 70 is locked by the groove 74 at the position shown by the two-dot chain line. It will be done. Therefore, in this state, the set-off state of the feed roller is maintained.

The operation of the embodiment of the present invention constructed as described above is as follows. First, when setting paper in the typewriter, it is necessary to set off the feed roller, and this is done by moving the lever 64 shown in FIG. 4 from the position shown by the solid line to the position shown by the two-dot chain line. That is, lever 6
4 is moved to the position shown by the two-dot chain line in FIG. 4, the drive shaft 16 rotates as described above, and the cut surface 60 of the drive shaft 16 moves to the swing lever as shown in FIG. 46 and pushes down the swinging lever 46 against the biasing force of the spring 58 to remove the roller 2 forming the feed roller.
2 and 24 are moved toward and away from the platen 59. In this state, the feed roller is set off and paper can be set in the typewriter. Next, to start printing on the typewriter, move the lever 64 shown in FIG.
The cut surface 6 of the actuating rod is rotated to the position shown in the figure.
2 is separated from the upper edge 60 of the swing lever 46, and the rollers 22, 26 are pressed toward the platen 59 by the biasing force of the spring 58.

In the above embodiment, the feed roller assembly 1
Since the swing arms 46 are disposed at the central positions of the rollers 8 and 20 in the axial direction of the platen, and the rollers 22 and 26 are pressed against the platen 59, the rollers 22 and 26 are pressed against the platen 59 with equal force. Also, the springs for pressing the rollers 22 and 26 against the platen 59 are the two swing arms 4.
Since it is attached only to 6 and 46, the spring pressure of both can be easily adjusted. Furthermore, the mechanism for setting off the feed roller includes a flat cut surface 62 formed on the actuating rod 16, and this cut surface moves the swinging arm 46, which presses the rollers 22, 26 toward the platen 59, away from the platen. Since we decided to push it down, the mechanism for setting off the feed roller is extremely simple. Furthermore, side frames 10, 12, arms 30, 32,
By using each of the swing levers 46 as a common press part, dimensional errors between the parts can be reduced, and the pressing forces of the rollers 22 and 26 against the platen 59 can be made equal.

In addition, the roller 26, the rotating shaft 28, the arm 30,
The tip of the swing lever 46, the connecting rod 34, and the operating rod 16 serve as guides for guiding the movement of the feed roller assembly consisting of the feed roller assembly 32 and the connecting rod 34 toward and away from each other. Therefore, unlike the prior art, it is not necessary to provide guides at both ends of the typewriter frame, and the feed roller assembly can be made smaller. The actuating rod 16, which functions as a guide, is connected to the arms 30, 3.
Since the guide has a diameter that closely fits inside the left and right sides of the two long holes 36, there is no play in the left and right direction, and the guide function can be performed accurately.

Furthermore, since the rotational force of the actuating rod 16 acts directly on the tip of the swinging lever 46, the moving toward and away from the swinging lever 46 can be performed more smoothly than in the prior art.

As explained above, according to the typewriter feed roller according to the present invention, a swing arm is provided at each center in the platen axis direction of the two sets of feed roller assemblies, and the roller is pressed onto each swing arm toward the platen. The provision of a spring makes it easy to adjust the pressing force of each roller, and the actuating rod has a flat surface that presses the upper edge of the swinging arm against the biasing force of the spring. The feed roller set-off mechanism is simplified because the roller is separated from the platen.

Further, since the approaching and separating movements of the feed roller assembly are guided at the tip of the swing lever, the feed roller assembly can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the line at the top of Fig. 1, and Fig. 2 is a drawing showing the feed roller in a set state.
The figure is an enlarged sectional view showing a state in which the feed roller is set off, and FIG. 4 is an enlarged view taken along the - line in FIG. 10, 12... Side frame, 14... Pipe frame, 16... Operating rod, 18, 20...
...Feed roller assembly, 22... Front feed roller, 24... Rotating shaft, 26... Rear feed roller, 28... Rotating shaft, 30, 32...
...Arm, 34...Connection rod, 46...Swing lever, 58...Spring, 62...Cut surface of operating rod.

Claims (1)

[Scope of utility model registration request] A first roller row made up of a plurality of rollers arranged on a first rotation axis, and a second roller row made up of a plurality of rollers arranged on a second rotation axis parallel to the first roller row. , an arm that pivotally supports both ends of the rotation shafts of the first and second roller rows and has a longitudinally elongated hole in the middle, and an arm extending parallel to the rotation shafts of the first and second roller rows between the arms. a plurality of feed assemblies arranged in parallel at positions where they can contact a platen pivotably supported on a typewriter frame, each having a connecting rod having both ends attached to the two arms; A rocking lever is provided at the other end with an elastic member that pivots the connecting rod at the central position in the roller axis direction of the feed roller assembly and biases one end toward the platen, and is rotatable at a position parallel to the platen. The arm is pivoted to the typewriter frame, passes through the elongated hole of the arm, has a diameter close to the left and right inner sides of the elongated hole, and is rotated while being pressed against the side edge of the platen near one end of the swing lever. By doing so, a circular arc surface that swings one end of the swing lever in a direction away from the platen against the biasing force of the elastic member and a flat cut surface that swings in a direction toward the platen are connected to the elongated hole. A feed roller for a typewriter, comprising: an actuating rod formed in a portion penetrating the feed roller.