JPS6313017Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printing paper feeding device in a printing device such as a typewriter.

A type drum-type printer, in other words, a large number of type bodies are embedded or engraved on the outer periphery of a cylindrical drum, and printed by hitting them with a hammer through the printing paper and ribbon while rotating or moving them in the axial direction. Printers of this type have been proposed in the past. However, unlike other types of printers, these printers do not have a platen roller for loading printing paper, making it difficult to handle single-sheet paper, and printing is mostly done using continuous paper.

The present invention aims to eliminate such drawbacks and to provide a paper feeding device for a type drum type printing device that allows easy handling of single sheets of paper.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the entirety of a type drum-type printing device employing the present invention.

Reference numeral 1 denotes a type drum having a large number of type bodies 2 embedded on its outer periphery, and while rotating itself in the circumferential direction, it performs reciprocating motion between both side walls 4 and 5 by the rotation of a helical shaft 3. Reference numeral 6 denotes a paper guide having an arcuate cross section, and is positioned between the side walls 4 and 5 so as to cover the type drum 1. The printing paper 7 is placed on the paper guide 6, and its upper end is gripped by a clamp device 8, and its lower part is clamped by a slip roller 9 and a pressure contact plate 10.
A carriage 11 is slidably supported by two guide shafts 12 and 13, and has a print head 14 on the top surface and a pair of reels 1 on which a ribbon 15 is wound.
6 and 16 are installed. 17 is a hammer positioning wire, and a large number of pulleys 18, 19,
It is connected to the carriage 11 via 20, 21, 22 and is driven by a hammer positioning motor 23.

The main paper feeding device is shown in FIGS. 2 and 3.

The paper feeding device has a paper guide surface 6a with a smooth outer surface.
The paper guide 6 has a semi-circular arc shape and the guide surface 6a.
It basically consists of a clamp device 8 that grips and slides the printing paper 7 on the top thereof, and a drive mechanism that drives the clamp device 8.

The paper guide 6 is disposed with its arc center located slightly rearward from the center of the type drum 1, and the inner surface 6b of the tip end is located at the center of the drum, leaving a slight gap between it and the type drum 1. It is cut into an arc with the center at . The paper guide 6 is supported by shafts 25 and 26 installed between the side walls 4 and 5. One of the shafts 26 is located at the rear of the side walls 4 and 5, and is connected to the rear end of the paper guide 6 by a screw 27. The other shaft 25 is located at the upper part of the side walls 4 and 5, and fixes the upper part of the paper guide 6 via supporting members 28 and 28. The support member 28 is approximately L-shaped in side view, and is fixed to both left and right ends of the paper guide 6 with screws 29, 29, and to the shaft 25 with a screw 30.

Directly below the front edge 6C of the paper guide 6 is a hammer 14a that is driven and protrudes from the print head 14.
A flat press plate 10 is erected at a distance sufficient for the paper to pass through, and a printing paper 7 is placed on the front surface of the flat press plate 10.
The slit roller 9 is elastically pressed into contact with the slit roller 9 via the slit roller 9.

The clamp device 8 has a grip part 31 in the center that grips the printing paper 7, and bridge parts 32, 3 at both ends thereof.
2 to the large-diameter internal gears 33, 33. The gripping portion 31, which is formed to have approximately the same width as the paper guide 6, consists of a long clip 34, an operating lever 35 at both ends, and a bearing 36, the details of which are shown in FIGS. 4 and 5. It is.
The front end of the plate-shaped clip 34 is bent and has a rubber resilient member 37 attached thereto, and the operating lever 35 is fixed to the upper surface of both left and right ends. The operating lever 35 has an operating section 38 at its rear end.
A protrusion 39 is formed at the tip, and a support shaft 41 protruding from the bearing 36 is fitted into a hole 40 formed through the center. A floating shaft 43 is connected to the support shaft 41 via a spring 42, and the floating shaft 43 is tensilely biased by the spring 42 and has one end in contact with the protrusion 39 side of the operating lever 35, and the other end in contact with the projection 39 side of the operating lever 35. Bearing tool 3
It is loosely fitted into the shaft chamber 44 provided in the shaft chamber 6. Further, another spring 46 is wound around the support shaft 41, and one end of the spring 46 is connected to the operating lever 35.
The other end is locked to a bearing 36 to urge the clip 34 to close.

Reference numeral 47 denotes a floor plate fixed to the lower part between the two bearings 36, 36.

To explain the operation of this clamp device 8, first, the operating lever 35 is operated by its operating portion 38.
By pressing lightly with a finger, it rotates in the counterclockwise direction in FIG. 5 about the support shaft 41. Then shaft chamber 4
The floating shaft 43, which was held between the upper wall 44a of 4 and the protrusion 39, climbs over the protrusion 39 while being tensilely biased by the spring 42 and fits into the lower part of the protrusion 39. The operating lever 35 is held between the bottom wall 44b and the operating lever 35, and is stopped in this state.
At this time, the clip 34 opens a large gap between the resilient member 37 and the paper guide 6, allowing the printing paper 7 to be attached and detached. After attaching and detaching the paper 7, by lightly pressing the upper surface of the clip 34 with your finger, the floating shaft 43 returns to its original position over the protrusion 39, and the elastic member 37 is pressed against the bed plate 47 side. The printing paper 7 is now in a gripping state.

Next, a drive mechanism for driving this clamp device will be explained.

The internal gears 33, 33 connected to the clamping device 8 at the bridge parts 32, 32 are located immediately inside the side walls 4, 5, their centers are set to be the same as the center of the paper guide 6, and their outer periphery is set to be the same as the center of the paper guide 6. Support roller 48
external gears 49, 49
are interlocked with each other.

The two external gears 49, 49 are connected by a shaft 50, and the shaft 50 is connected to an interlocking gear 51 outside the side wall 5, and the interlocking gear 51 is a main drive gear rotationally driven by a step motor 52. 53
It meshes with the By driving the step motor 52 in this manner, the rotation of the main drive gear 53 is transferred from the interlocking gear 51 to the internal gear 3 via the external gears 49, 49.
3 and 33, the clamp device 8 rotates one pitch at a time or continuously along the outer periphery of the paper guide 6 to feed the printing paper 7.

As explained above, according to the paper feeding device according to the present invention, it is easy to load a single sheet of paper, and the feeding operation can be performed reliably.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the entire printing device employing the paper feeding device according to the present invention, Fig. 2 is a front view of the paper feeding device, Fig. 3 is a longitudinal side view showing the drive device, and Fig. 4 is a perspective view showing the entire printer. A plan view of the clamp device, and FIGS. 5A and 5B are cross-sectional views taken along the line A-A in FIG. 4. 1...Type drum, 6...Paper guide, 6a...
... Paper guide surface, 7 ... Print paper, 8 ... Clamp device, 31 ... Grip section (grip member), 32 ... Bridge section (bridge member), 33 ... Internal gear (large diameter gear), 49 ... External gear, 51 ... Interlocking gear, 52
. . . Step motor (drive motor), 53 . . . Drive gear.

Claims (1)

[Scope of utility model registration request] A paper guide whose outer surface is a printing paper guide surface is positioned to cover the cylindrical type drum, and a clamp device is provided on the guide surface to grip and move the printing paper, and the clamp device A large-diameter gear that rotates around the same central axis as the central axis of the machine, a gripping member for printing paper fixed to the large-diameter gear via a bridging member, and a drive motor that is gear-coupled to the large-diameter gear. A paper feeding device in a printer characterized by: