JPH0440937Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention relates to a paper feeding device for printers and the like that can reliably feed even thick printing paper such as postcards.

(Prior Art) Conventionally, in this type of paper feeding device, a paper feeding roller for feeding a cut sheet in cooperation with a platen was always pressed against the platen with a constant force.

(Problems to be Solved by the Invention) However, with this conventional configuration, when printing on thick printing paper such as postcards, the pressing force of the paper feed roller against the platen is insufficient, so it cannot be reliably printed. It was not possible to obtain a proper feeding action.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, this invention includes a platen 2 rotatably supported on a frame 1 and a paper feed roller 28 engaged with the platen 2. In the paper feeding device, the first paper feeding roller 12 is always in contact with the platen 2, the second paper feeding roller 28 is in an inactive position separated from the platen 2 on one side, and an active position in which it is engaged with the platen 2. a roller support member 18 that is movably supported and exposed to the mounting section on the other side; and a second paper feed roller 28 that engages with the other side of the roller support member 18 when mounted on the mounting section. It is characterized by comprising a member 41 for moving to the operating position, and a feeding device 34 for feeding thick printing paper, such as a postcard, between the platen 2 and the paper feed rollers 12, 28.

[Function] According to the present invention having the above configuration, when the supply device 34 is attached to the mounting portion, the other side portion exposed from the mounting portion engages with the member 41. Then, the second roller support member 18 moves to a state where the paper feed roller 28 is placed in the operating position. When the second paper feed roller 28 is placed in the active position,
Based on the strong pressure between the first paper feed roller 12 and the second paper feed roller 28 and the platen 2, thick printing paper C such as a postcard is reliably fed without slipping. In addition, when printing on normal printing paper P with a small paper thickness, by removing the supply device 34 from the frame 1, the printing paper P can be moved by the first paper feeding roller 12 without being hindered by the paper feeding roller 28. Sent.

(Example) Hereinafter, an example that embodies this invention will be described based on the drawings.

As shown in Figures 1 and 2, a platen 2 is rotatably supported on the rear side of the frame 1 of the printer (right side in Figure 1), and a paper supply port 3 is provided on the rear side of the platen 2. It is formed. In front of the platen 2, a carriage 6 carrying a print head 5 is arranged so as to be movable back and forth along the platen 2 by means of a guide shaft 4. A guide protrusion 9 is formed on an internal frame 8 provided in the frame 1 so as to face the lower surface of the platen 2 and form a paper transport path, and a plurality of guide protrusions 9 are formed on the upper surface of the inner frame 8 along the platen 2. A long hole 10 is provided transparently.

A guide roller 12 that fits into each elongated hole 10 is rotatably mounted on a roller mounting plate 11 that is engaged with the internal frame 8 at a position corresponding to each elongated hole 10, and each guide roller 12 is mounted with a roller. Due to the spring force of the plate 11, it is always pressed against the platen 2 with a predetermined force. Then, the cut sheet P supplied from the paper supply port 3 is sent to a printing position facing the print head 5 by the cooperation of the platen 2 and each guide roller 12, and the print head 5 and a ribbon (not shown) are sent to the print position facing the print head 5. Printing is now possible through collaboration.
In addition, in FIG. 1, 13 is a cover that covers the printing section.

Frame 1 located below the paper supply port 3
A notch 16 is formed at one end of the rear wall 15, and a roller support member 18 made of synthetic resin is rotatably mounted on a pair of support shafts 17 protruding from the upper end of the notch 16. It is attached. Roller support member 18
It is formed into a substantially V-shaped cross section, consisting of a support plate portion 19 that projects downward from the platen 2, and an engagement plate portion 20 that is exposed to the outside of the frame 1 through the cutout portion 16. A slit 21 is formed on both left and right sides of the support plate portion 19, leaving the tip portion thereof, and an elastic mounting piece 22 is integrally formed with the slit 21, and a recess 2 into which the support shaft 17 is fitted is formed on the outer surface of the slit 21.
3 is formed. And both elastic mounting pieces 22
By curving this roller support member 1
8 can be attached to and detached from the frame 1.

On the other hand, support pieces 25 are integrally formed on both left and right sides of the tip of the support plate portion 19, and a V-shaped slit 2 is formed therein.
A shaft support hole 27 is formed which opens to the outer periphery through the shaft hole 6 . A paper feed roller 28 is rotatably and removably supported in the shaft support hole 27 by protruding portions at both ends of a shaft 29 thereof. On the other hand, a biasing piece 31 that engages with a protrusion 30 provided on the rear surface of the internal frame 8 is integrally formed on the inner surface of the connecting portion between the support plate portion 19 and the engagement plate portion 20 . The acting force of the biasing piece 31 always biases the roller support member 18 in the counterclockwise direction in FIG. Therefore, in the natural state, as shown in FIG. 3, the paper feed roller 28 is supported on the groove surface of the housing groove 32 of the internal frame 8 with a predetermined distance away from the platen 2, and the paper feed roller 28 is supported on the groove surface of the housing groove 32 of the internal frame 8, and The outer surface of the frame 20 is flush with the outer surface of the rear wall 15 of the frame 1. In addition, 33 is the support plate part 19
This is a paper guide protrusion formed upwardly on the leading edge of the paper guide.

As shown in FIG. 1, the paper feed roller 28
A postcard feeding device 34 is arranged adjacent to the rear of the printer frame 1 at a position corresponding to
It is positioned and held by engagement with a fitting hole 36 formed in . Left and right side plates 3 of the postcard feeding device 34
A mounting table 38 is provided obliquely between the mounting table 3 and the mounting table 38.
A plurality of postcards C are stacked and supported on 8.
A feed roller 39 having a notch 39a is rotatably supported above the lower end of the mounting table 38, and as it rotates clockwise, the uppermost postcard C on the mounting table 38 is transferred one by one to the platen 2. The paper can be supplied between the paper feed roller 28 and the paper feed roller 28. Further, a plate-shaped holding piece 41 made of an elastic member is attached to the lower surface of the lower end of the mounting table 38, and a bent end portion 42 of the holding piece 41 projects toward the frame 1 side of the printer through a slit 40. When the postcard feeding device 34 is attached, the bent portion 42 of the holding piece 41 comes into contact with the engagement plate portion 20 of the roller support member 18, so that the roller support member 18 resists the urging force of the urging piece 31. is rotated clockwise, and the paper feed roller 28 is placed in an operating position where it comes into pressure contact with the platen 2, and is elastically held at that position.

Now, when printing on a postcard C using the paper feeding device of this embodiment constructed as described above, first the postcard feeding device 34 is attached to the rear of the frame 1 of the printer as shown in FIG. As a result, the holding piece 41 of the feeding device 34 is engaged with the engagement plate portion 20 of the roller support member 18, the roller support member 18 is placed in the operating position, and the paper is fed based on the elastic force of the holding piece 41. The roller 28 is pressed against the platen 2 with a relatively strong force. In this state, the sending roller 39 of the postcard feeding device 34
is rotated, the uppermost postcard C on the mounting table 38
is inserted between the platen 2 and the paper feed roller 28 from the paper supply port 3. As the platen 2 rotates, the platen 2, the paper feed roller 28, and the indoor roller 12 work together to send the postcard C to a printing position facing the printing head 5, where printing is performed by the printing head 5. In this case, since the paper feed roller 28 is in pressure contact with the platen 2 in addition to the guide roller 12, the postcard C made of thick paper with strong restoring force can be reliably fed without slipping.

Also, when printing on normal printing paper P, which is thin in paper thickness, with this printer, first frame 1 is printed.
Remove the postcard feeding device 34 from the. Then, the engagement between the holding piece 41 and the roller support member 18 is released, and
The roller support member 18 is placed in the inactive position shown in FIG. 3 according to its own weight and the biasing force of the biasing piece 31, and the paper feed roller 28 is separated from the platen 2. Therefore, the printing paper P inserted through the paper supply port 3 is transferred to the printing position by the cooperation of the platen 2 and the guide roller 12, and printing is performed. At this time, the paper feed roller 28 moves to the platen 2.
Since the guide rollers 12 apply a uniform force to the printing paper P over its entire width, the printing paper P is reliably fed in a direction perpendicular to the printing lines.

Note that this invention is not limited to the configuration of the above embodiment, and for example, the paper feed roller 2
A roller support member 18 may be provided on the frame 1 so as to be movable back and forth so that the roller support member 8 moves between the working position and the non-working position. It is also possible to arbitrarily change the shape and configuration of each part and embody the invention without departing from the spirit of the invention, such as by applying it to a printer to which a supply device is attached.

Effects of the invention As detailed above, according to this invention, as the feeding device is attached and removed, the paper feed roller is placed in the working position where it engages with the platen and the non-working position where it is separated from the platen, so that the paper feed roller can This provides an excellent effect of reliably feeding both thick cut sheets such as paper sheets and normal cut sheets that are thin in paper thickness.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of the main parts of a printer that embodies this idea, Figure 2 is a plan view of the main parts of the printer, and Figure 3 is a top view of the main parts of the printer.
The figure is a partial vertical sectional view of the printer showing an operating state different from that in FIG. 1. 1 is a frame, 2 is a platen, 3 is a paper supply port, 5 is a print head, 12 is a guide roller, 18 is a roller support member, 28 is a paper feed roller, 31 is a biasing piece, 32 is a postcard feeder, 41 is an elastic member A holding piece is used as a member, C is a postcard, and P is a printing paper.

Claims (1)

[Claims for Utility Model Registration] 1. A platen 2 rotatably supported on a frame 1.
and a paper feed roller that is engaged with the platen 2, the first paper feed roller 12 is always in contact with the platen 2, and the second paper feed roller 28 is separated from the platen 2 on one side and is inactive. a roller support member 18 which supports the roller support member 18 so as to be movable between the position and the operating position engaged with the platen 2 and is exposed to the mounting section on the other side; and the roller support member 1 when mounted to the mounting section.
A member 41 is provided which moves the second paper feed roller 28, which is normally in an inactive position, to an active position by engaging with the other side of the platen. 2 and the first and second paper feed rollers 12, 2
8. 2. The paper feeding device according to claim 1, wherein the engaging member 41 is an elastic member, and elastically holds the second paper feeding roller 28 in an operating position where it engages with the platen 2. 3. The other side of the roller support member 18 forms a continuous surface with the frame 1 when the supply device 34 is not attached.Claim 1 or 2 of the Utility Model Registered Claims The paper feeding device described in .