JPH0230864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording paper feeding device for printing machines such as typewriters and printers, and its purpose is to simplify and rationalize the structure of conventional devices of this type. be.

A conventional device of this kind, which is the object of the improvement of the present invention, will be described with reference to FIGS. 1 and 2. FIG. 1 is a platen, 2 is a recording paper, 3 is a rear feed roller that feeds the recording paper 2, 4 is a front feed roller, 5
are bail rollers that fix the recording paper, and these are separated from the platen 1 when the recording paper 2 is inserted. Reference numeral 6 denotes an arc-shaped guide plate that guides the insertion of the recording paper, and has two pairs of elongated holes 6a and 6b at the front and back, and the feed rollers 3 and 4 are pressed against the platen 1 through the elongated holes 6a and 6b. do. Although the illustration shows a case in which two feed rollers 3 and 4 are provided in the longitudinal direction, there may be one feed roller each if the platen 1 is short. Further, when the platen 1 is long, there may be a plurality of two or more pieces. A pair of feed rollers 3 and 4 are connected at both ends by an arc-shaped cradle 7, and each cradle 7 is rotatably attached to an operating arm 9 by a pin 8 at its midpoint. A pair of U-shaped protrusions 6c provided on the lower surface of the guide plate 6 regulate the position of the pin 8. The actuating arm 9 includes a front protrusion 9a that supports the roller shaft 4a of the front feed roller 4, an intermediate protrusion 9b that supports the pin 8, a rear protrusion 9c that supports the roller shaft 3a of the rear feed roller 3, and an actuating shaft 10. A coil spring 12 is interposed between the rear end 9e and the fixed shaft 11, and the feed rollers 3 and 4 are urged by the coil spring 12 to press against the platen 1. has been done. Reference numeral 13 denotes an operating lever having a U-shaped cross section that is actuated simultaneously by four operating arms 9, and is rotatably supported at both ends by a chassis 18, and one side of which is supported by a release post 14 having an elliptical cross section. The other side is connected to a spring 16 whose one end is attached to a fulcrum 15 provided on the chassis 18. 17 is an actuation handle that engages with the release post 14. In the above configuration, when the operating handle 17 is rotated in the direction of the arrow, the operating lever 13 is rotated in the direction of the arrow against the spring 16.
The four actuating arms 9 and the four cradles 7 coupled thereto are interlocked and similarly rotated against the coil spring 12. Therefore, the feed rollers 3 and 4 can be separated from the platen 1, and recording paper can be inserted.

By the way, the above-mentioned conventional feeding device has a total of four operating arms 9 with a complicated structure for four cradles 7 that connect both ends of the two sets of feeding rollers 3 and 4.
An actuating lever 13 and a release post 14 are required to operate this at the same time. Furthermore, its accessory parts include coil springs 12, 16, operating shaft 10,
A fixed shaft 11 and the like are also required. As described above, when the structure is complicated and the number of parts increases, it becomes difficult to improve the productivity of this type of device, which requires high assembly precision. In view of this point, the present invention is intended to simplify and rationalize the structure of the device and improve its productivity.

An embodiment of the invention will be described with reference to FIGS. 3 and 4. FIG. 3 is an exploded perspective view of the feeding device of the present invention, FIG. 4 A and B show both end faces thereof, and C shows the front face. The guide plate 6 of the present invention has elongated holes 6a, 6.
Each of the feed rollers 3 and 4 is rotatably supported by the cut and raised shaft ends 3a and 4a of the feed rollers 3 and 4, respectively. Therefore, in the device of the invention, the guide plate 6 also serves as the cradle 7 of FIGS. 1 and 2.
The guide plate 6 supporting the feed rollers 3 and 4 is urged upward by a band-like spring plate 20 interposed between the guide plate 6 and the chassis 19. The spring plate 20 has a semi-cylindrical curved part 20a projecting downward in the center thereof, and has two protrusions 20b (four in total) on both sides of the curved part 20a, with notches at both ends. A push-up piece 20d having a diameter of 20c is formed. The chassis 19 has semicylindrical recesses 19a and slots 19b on its horizontal sides 19d at positions corresponding to the curved portions 20a and protrusions 20b, respectively, and bearings 19c are provided at both ends. Reference numeral 21 denotes an operating shaft whose both ends and central portion are rotatably supported by bearings 19c.
There are four recesses 21a with a semicircular cross section at positions corresponding to c.
There are several. This operating shaft 21 passes through a pair of U-shaped protrusions 6c provided on both sides of the guide plate 6, and a driving gear 22 is attached to one end thereof. Reference numeral 24 denotes an operating handle having a gear 23 that meshes with the gear 22, and is rotatably attached to the chassis 19 by a shaft pin 25. Although the gears 22 and 23 are effective for setting the rotation angle of the operating shaft 21, they may be omitted and the operating handle 24 may be directly connected to the operating shaft 21.

Next, the operation of the feeding device of the present invention will be explained. Fourth
The figure shows a state in which the concave portion 21a of the actuating shaft 21 is directed downward within the notch 20c of the spring plate 20, and the push-up pieces 20d at both ends of the spring plate 20 are pushing up the guide plate 6 due to its elastic force. It shows. Therefore, the feed rollers 3 and 4 supported by the guide plate 6 are in pressure contact with the platen 1. Next, operation handle 2
4 in the direction of the arrow to rotate the operating shaft 21 to the gear 2.
3 and 22 through 180 degrees, the recess 21a faces upward as shown in FIG. In addition, the operating axis 2
The rotation angle of 1 is not necessarily limited to 180° (1/2 rotation), and the circumference of the operating shaft 21 is the push-up piece 20d.
It is sufficient that the contact angle is between 90° and 270°. As the operating shaft 21 rotates from 90° to 270°, the push-up pieces 20d at both ends of the spring plate 20 are pushed down by the circumference of the operating shaft 21 against the elastic force, and the push-up pieces 20d push up the spring plate 20. lower the guide plate 6 that has been
Therefore, the feed rollers 3 and 4 supported by the guide plate 6 are separated from the platen 1, and the recording paper 2 can be inserted. When the recording paper 2 is inserted, the operation handle 24 presses the feed rollers 3 and 4 against the platen to feed the recording paper. When the recording paper reaches the front of the platen, it is moved to the bail roller 5.
Fixed by

As described above, the recording paper feeding device for a printing machine according to the present invention is suitable for use in printing machines such as typewriters and printers in which the recording paper is guided in the circumferential direction of the platen by a feeding roller that is in pressure contact with the platen. The feed rollers 3 and 4 are urged to come into pressure contact with the platen 1 between a support member (guide plate 6, cradle 7, etc.) that supports the feed rollers and a substrate (the chassis 19 or a fixed plate in place of this). A spring plate 20 is interposed therebetween, and the feed rollers 3 and 4 are moved against the elastic force of the spring plate 20.
the spring plate 2 so as to separate it from the platen 1;
It has a structure in which an operating shaft 21 that acts on zero is provided.
The spring plate 20 has a semicylindrical curved part 20a provided in the center thereof, and a pair of protrusions 20b on both sides thereof, and push-up pieces 20d at both ends for pushing up the support member (guide plate 6). The substrate (chassis 19) is provided with a semicylindrical recess 19a and a slot 19b into which the curved portion 20a and the projection 20b are fitted. Further, the operating shaft 21
Notch 20 provided in push-up piece 20d of spring plate 20
The bearing 1 has a recess 21a with a semicircular cross section at a position corresponding to c, and both ends are provided on the base plate (chassis 19).
9c, and an operating handle 24 is provided at one end.

Since the present invention has the above configuration, it has the following effects. (1) The conventional device shown in FIGS. 1 and 2 has a complicated structure as described above and is composed of many parts, but the feeding device of the present invention has a spring plate 20 and an operating shaft 21. The structure is simple, the number of parts is small, and the device can be made smaller. (2) The spring plate 20 is the chassis 1
A curved portion 2 is formed in the recess 19a and the slot 19b provided in the groove 9.
It can be easily attached by fitting the protrusion 0a and the protrusion 20b, and its positioning is accurate. Similarly, the operating shaft 21 can be mounted accurately and easily by fitting it into the bearing 19c. (3) The streamlined and simple structure described in (1) above and the ease of assembly described in (2) above combine to significantly improve productivity. (4) It has the advantage of being applicable to all types of printing machines, such as typewriters, printers, and printing machines equipped with sprocket-driven paper feeding devices.

[Brief explanation of drawings]

Fig. 1: Side view of a conventional feeding device, Fig. 2: An exploded perspective view of the device shown in Fig. 1, Fig. 3: An exploded perspective view of the feeding device of the present invention, Fig. 4: An exploded perspective view of the device shown in Fig. 3. In the assembly drawings, A and B are side views, C is a front view, Figure 5: An explanatory diagram of the function of Figure 4, A is a side view, B is a front view [Symbols], 1... platen, 2... Recording sheet,
3... Rear side feed roller, 4... Front side feed roller,
5...Bail roller, 6...Guide plate, 6a, 6
b... Long hole, 6c... U-shaped protrusion, 6d... Cut and raised, 7... Cradle, 19... Chassis, 19
a... recess, 19b... slot, 19c... bearing,
19d...Horizontal side, 20...Spring plate, 20a...
Curved portion, 20b...protruding piece, 20c...notch portion,
20d... Push-up piece, 21... Operating shaft, 21a...
Recessed portion, 22, 23...gear, 24...operation handle, 25...shaft pin, 26...sprocket.

Claims (1)

[Scope of Claims] 1. A platen 1, a paper guide member 6 provided parallel to the longitudinal direction of the platen 1, and a paper guide member 6 mounted parallel to the longitudinal direction of the paper guide member 6 and provided to the paper guide member 6. long hole 6
Feed rollers 3 and 4 whose peripheral surfaces are exposed to the platen 1 side from a and 6b, and the chassis 1 along the longitudinal direction of the platen.
a spring plate 20 supported by the paper guide member 6 and biasing the paper guide member 6 in the direction of the platen 1;
1. A feeding device for recording paper in a printing machine, characterized in that the operating shaft 21 is mounted above and in contact with the platen, and rotates to move the tip of the spring plate toward or away from the platen. 2. The spring plate 20 is provided with a semi-cylindrical curved portion 20a in its center, and the curved portion 20a is placed in a semi-cylindrical recess 19a provided in the chassis 19. A feeding device for recording paper in a printing machine according to scope 1.