JPH0430208Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is applicable to computers, word processors,
The present invention relates to a paper feeding device that feeds paper (continuous paper) to printers used in drawing machines and other various printers.

[Conventional technology]

In this type of paper feeding device, a belt guide is formed between a pair of side frames, a drive pulley is rotatably supported by the pair of side frames adjacent to the belt guide, and the belt guide and drive pulley are connected to each other. An endless feed belt with feed pins protruding at a predetermined pitch is stretched around the belt, and by rotationally driving the drive pulley, the endless feed belt moves between the linear guide portion, the arcuate guide portion, and the belt guide. A feed pin that runs on each guide surface of the other linear guide part and protrudes from a portion of the feed belt that is running on the guide surface of one of the linear guide parts of the belt guide is attached to the edge of the paper. It is configured to engage with feed holes that are protruded in a line along the line to send out the paper.

Further, the belt guide is usually formed integrally with one of the pair of side frames, and its guide surface has approximately the same width as the belt width of the feed belt.

[The problem that the idea aims to solve]

In a conventional paper feeding device, the width of the guide surface of the belt guide is almost the same as the width of the endless feeding belt, and the feeding belt has two sides of the belt guide.
Since the belt travels on the guide surface of a long guide section consisting of two linear guide sections and an arcuate guide section formed between them, the frictional force between the guide surface and the feed belt is large, and the drive pulley The rotational driving force of the paper must be increased, and the frictional force may cause the feeding belt to run unstable, making it difficult to feed the paper smoothly.

In order to reduce the above-mentioned frictional force, a plurality of parallel grooves are formed in the guide surface along the running direction of the feed belt (for example,
191450), forming multiple parallel grooves on the guide surface of the belt guide formed integrally with the side frame not only increases the mold cost when the side frame is molded from synthetic resin. The molding process becomes complicated, and burrs are generated on the guide surface of the belt guide due to the division of the mold.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the width of the guide surface of the belt guide to reduce the frictional force generated between the belt guide and the feed belt, and to provide a lightweight paper feeding device.

[Means to solve the problem]

In the paper feeding device of the present invention, the belt guide is formed separately from the pair of side frames, and the width of the guide surface of the linear guide portion and the arcuate guide portion is the same as that of the feed pin formed on the feed belt. A plurality of holding protrusions are integrally formed with the belt guide in the width direction of the guide surface, and the holding protrusions of the belt guy are brought into contact with the pair of side frames. A surface is positioned substantially in the center between the side frames and fixedly supported between the frames, and a surface of the pair of side frames facing each other is provided with a position corresponding to the linear guide portion of the belt guide. The present invention is characterized in that a belt guide surface is formed to guide the side edge of the feed belt.

[Effects of action and design]

According to the present invention, when the drive pulley is driven, the endless feed belt that is stretched around the drive pulley moves in the longitudinal direction along the guide surfaces of the linear guide section and the arcuate guide section of the belt guide. drive towards. The width of the guide surface of the belt guide is approximately the same as the diameter of the feed pin protruding from the feed belt, so it is smaller than the overall width of the feed belt, but it is formed integrally with the belt guide. The holding protrusions abut against the pair of side frames at their tips to position the guide surface approximately in the center between the pair of side frames, and furthermore, the belt guide surface formed on the side frame supports the belt guide surface. Since both side edges of the belt are guided, the feed belt runs stably.Moreover, the contact area between the feed belt and the guide surface of the belt guide is about half that of the conventional one, so the contact area between the guide surface and the feed belt is reduced. The frictional resistance between the two can be reduced to about half that of the conventional one.

The belt guide is formed separately from the pair of side frames, and the width of the guide surface in contact with the feed belt is approximately the same as the diameter of the feed pin formed on the feed belt, and By integrally forming a plurality of holding protrusions on both sides in the width direction, the tips of which abut against the pair of side frames, the main part of the belt guide can be strong even if it has a width smaller than the width of the guide surface. Since it is possible to create a configuration that does not impair the performance of the paper feeding device, it is possible to reduce the weight of the entire paper feeding device.

〔Example〕

The drawings show one embodiment of the present invention,
The frame main body 8 includes a pair of side frames 9 and 10 having substantially rectangular side surfaces, and a belt guide 11 disposed between these side frames 9 and 10.
and the pair of side frames 9, 10.
The drive pulley 17 is rotatably supported by the drive pulley 17.

The drive pulley 17 has a boss portion 18 that forms a square hole 19 centered around the rotation center and has a cylindrical outer peripheral surface.
A large diameter pulley portion 21 is concentrically formed on the outer peripheral surface of the boss portion 18 in the axial center thereof, and teeth portions 22 are formed on the outer peripheral surface of the pulley portion 21. The drive pulley 17 has bearing holes 15 and 16 formed concentrically through both ends of the boss portion 18 of the pair of side frames at symmetrical positions near the first ends in the long side direction of the pair of side frames 9 and 10. The pulley portion 21 is rotatably supported between the pair of side frames 9 and 10.

The belt guide 11 has a substantially rectangular side surface shape as a whole, and its two long sides are:
The linear portions are parallel to each other, and are positioned between the side frames 9 and 10 so that the linear portions are parallel to the long sides of the side frames 9 and 10. The short side of the belt guide 11 adjacent to the drive pulley 17 is an arc-shaped surface recessed so as to be concentric with the outer peripheral surface of the teeth 22 of the drive pulley 17. The short side on the second end side in the long side direction is formed into an arcuate portion that is inscribed in both the linear portions and bulges outward. The outer peripheral edges of the two linear parts and the circular arc part are provided with a guide surface 11a that guides the feed belt 1 and causes it to run.
are formed respectively. These guide surfaces 11a,
This will be referred to as a guide surface of a linear guide section or a guide surface of an arcuate guide section as necessary. The guide surface 11a of the linear guide portion and the guide surface 1 of the arcuate guide portion
As will be described later, the width W of 1a is smaller than the width of the feed belt 1, and has a width that is approximately the same as the maximum diameter of the feed pin 6 protruding from the feed belt 1 (see FIG. 3). In the vicinity of both ends of the arcuate surface adjacent to the drive pulley 17 of No. 11 and on the second end side, a circular arcuate portion protrudes outward on both sides of the belt guide 11 in the width direction of the guide surface 11a. A plurality of holding protrusions 11b are provided in a protruding manner, and one rectangular locking hole 14, 1 is provided at a position close to the arcuate surface and the arcuate portion, respectively.
4 is formed through the hole. a pair of side frames 9,
10 has elastic connecting claws 12 and 13 on their mutually opposing surfaces, each having a hook formed at its tip to engage with the edge of the engagement holes 14 and 14 formed in the belt guide 11. 1 for stop hole 14
Each one is integrally formed to protrude. Therefore, the connecting claws 12, 13 of the pair of side frames 9, 10 are inserted into the locking holes 14, 14 of the belt guide 11, respectively, and both ends of the boss portion 18 of the drive pulley 17 are inserted into the side frames 9, 10. When the pair of side frames 9, 10 are inserted into the bearing holes 15, 16 of the belt guide 11, and the pair of side frames 9, 10 are pushed in the direction toward each other, the holding protrusions 11b protruding from both sides of the belt guide 11 are inserted into the pair of side frames 9, 10. The guide surface 11a is positioned approximately in the center between the pair of side frames 9, 10 by abutting the tips thereof against mutually opposing surfaces, and connecting claws 12, 13 protruding from the side frames 9, 10 are provided. The claw formed at the tip of the belt guide 11 is elastically locked to the edges of the locking holes 14, 14, and the belt guide 11 is fixedly held between the pair of side frames 9, 10, and is driven at the same time. Pulley 1
7 is the bearing hole 15, 1 of the pair of side frames 9, 10.
A frame body 8 of a paper feeding device rotatably supported by 6 is assembled.

Prior to assembling the side frames 9, 10, belt guide 11 and drive pulley 17, the feed belt 1 is attached to the drive pulley 17 and belt guide 11.
It is spanned over the guide surface 11a of. The feed belt 1 is made of an elastic material such as rubber or synthetic resin and is formed into an endless shape, and is positioned along the left and right edges of the paper (not shown) sent to the printer by the paper feed device. The feed holes are bored in a row along the longitudinal direction of the feed belt 1 on the outer circumferential surface of the feed belt 1 at the same pitch as the feed holes protruding in a row at the same pitch, and the inner circumferential surface of the feed belt 1 has the Internal teeth 7 are formed to mesh with tooth portions 22 formed on the outer peripheral surface of the drive pulley 17. Therefore, in the frame body 8 of the paper feeding device, when the driving pulley 17 is driven to rotate, the internal teeth 7 of the feeding belt 1 and the teeth 22 of the driving pulley 17 mesh with each other, so that the feeding belt 1 is moved along the belt guide 11. The belt travels on the guide surface 11a while being guided by the guide surface 11a, and as shown in FIG.
1a, the belt bends in an arc shape as shown by numeral 3, and runs along the guide surface 11a of the straight portion of the belt guide 11, as shown by numerals 4 and 5. The part where the feed belt 1 meshes with the drive pulley 17 is designated by the symbol 2.
As shown, the drive pulley 17 travels while being bent in an arc shape along the pulley portion 21 of the drive pulley 17.

Among the pair of side frames 9 and 10, the short side portion of one side frame 9 corresponding to the drive pulley 17 is provided with a feed belt 1 having a reference numeral 2, which runs in an arc shape along the pulley portion 21 of the drive pulley 17. A belt regulating piece 23 is formed radially outward of the portion. The feeding belt 1 of this belt regulating piece 23
The surface facing the feed pin 1 is an arcuate surface facing the tip of the feed pin 6 with a slight gap, and is formed concentrically with the outer peripheral surface of the pulley portion 21 of the drive pulley 17, and has a length along the arcuate surface. The length is formed to be longer than the pitch interval of the feed pins 6 of the feed belt 1 by an appropriate length, and floats above the drive pulley 17 while the feed belt 1 travels in an arc shape as shown by reference numeral 2 by the drive pulley 17. This prevents the drive pulley 17 from floating above the teeth 22 of the drive pulley 17 and hindering the transmission of the drive force when the drive force is transmitted from the drive pulley 17 to the feed belt 1.

The pair of side frames 9 and 10 are provided with belt guide surfaces 9a and 10a for guiding both side edges of the feed belt 1, respectively, on the inner surfaces opposite to the guide surface 11a of the linear guide portion of the belt guide 11. In addition, notch-shaped relief grooves 9c and 10c are formed in the portions of the linear guide portions that face approximately the center thereof, to reduce friction caused by contact between the belt guide surfaces 9a and 10a and both side edges of the feed belt 1. Relief grooves 9c, 10
Reduce with c. Also, an escape groove 11c is formed between the guide surface 10a of the linear guide portion of the belt guide 11 and the guide surface 10a of the arcuate guide portion, and the contact area between the inner circumferential surface of the feed belt 1 and the guide surface 10a is Reduce.

The frame body 8 of the paper feeding device includes a drive shaft 20 having a square cross section that is slidably inserted into a square hole 19 formed through the boss portion 18 in the axial direction along the central axis of the drive pulley 17; The printer is supported by a support shaft 25 that is movably inserted in the axial direction into a cylindrical boss portion 26 formed approximately at the center of one of the side frames 9 and 10 of the pair of side frames 10 .

The other side frame 9 is formed with an upwardly opening box-shaped holding portion 27 in which a lock lever 28 for detachably holding the frame body 8 at a desired position with respect to the support shaft 25 is installed. There is. One side wall of the inner surface of this holding portion 27 serves as a restraining surface 27a of the lock lever 28.

As shown in FIG. 1, FIG. 3, FIG. 4, and FIG. It is mainly composed of an operation handle 30 that is integrally provided. The lock lever 28 has a boss portion 29 that is connected to the holding portion 2.
The operating handle 30 protrudes from the opening of the holding portion 27 so as to be manually operable in a state in which the operating handle 30 is inserted through the upper opening of the holding portion 27 and its center hole is fitted onto the support shaft 25 . Furthermore, a cam surface 31 is formed on the outer circumferential surface of the boss portion 29 of the lock lever 28, and the radius of curvature is gradually increased in the counterclockwise direction in FIG. 4 with respect to the center of the support shaft 25. By rotating clockwise as shown in , the cam surface 31 bites into the restraining surface 27a of the holding portion 27, thereby locking the frame body 8 at a desired position on the support shaft 25. It is designed to handle paper of different paper widths.

At the upper part of the outer surface of the one side frame 9, a pair of front and rear bearing pieces 32 for the paper presser plate 34 are provided.
A hinge pin 35 integrally formed on one side of the paper pressing plate 34 is rotatably fitted into an upwardly open bearing hole 33 formed in these bearing pieces 32. The paper holding plate 34 is opened and closed around its hinge pin 35 and is closed across the upper end surfaces of the pair of side frames 9 and 10, thereby preventing the paper from lifting up. Also, a spring hanging portion 3 formed between the paper pressing plate 34 and one side frame 9
A tension spring 38 is interposed between 6 and 37, and the spring force of this tension spring 38 urges the paper press plate 34 to the open position and the closed position, respectively. In addition, the paper press plate 34
A long groove 39 in the front-rear direction is provided through which the feed pin 6 of the feed belt 1 can freely move.

Note that the paper feeding devices configured as described above are arranged as a pair of left and right and straddle between the drive shaft 20 and the support shaft 25 so as to be movable in the axial direction. Also,
The pair of side frames 9 and 10, the belt guide 11, etc. are each made of synthetic resin, and in particular, the belt guide 11 is made of a synthetic resin material with a small coefficient of friction.

Further, as is well known, the drive shaft 20 and the support shaft 2
Reference numeral 5 is installed within a frame on the side of the printer or computer, and the drive shaft 20 is rotationally driven by a drive unit whose drive source is a motor.

In this embodiment configured as described above, each of the feeding belts 1 of the left and right paper feeding devices is
The feed pins 6 are fitted into the feed holes formed on the left and right sides of the paper, and the drive pulley 17 is rotated in a predetermined direction by the drive shaft 20 with the paper presser plate 34 closed. , the paper is fed by driving the feed belt 1.

When the feed belt 1 is driven, the arc-shaped running portion of the feed belt 1 shown by reference numeral 3 and the reference numeral 4,
Both linear running parts indicated by 5 are supported in contact with the guide surface 11a of the belt guide 11.

The guide surface 11a of the belt guide 11 is located at a position corresponding to the feed pin 6 of the feed belt 1,
The width of the feed pin 6 is narrow enough to be approximately the same width as the diameter of the feed pin 6. As a result, the frictional force generated between the feed belt 1 and the guide surface 11a of the belt guide 11 is reduced, and the feed belt 1 runs easily and smoothly.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is an exploded perspective view of the paper feeding device, Figure 2 is a side sectional view, Figure 3 is a plan sectional view, and Figure 4 is a cross-section showing a state in which the cam surface and restraint surface of the lock lever are unlocked. FIG. 5 is a sectional view similarly showing the locked state. 1...Feeding belt, 6...Feeding pin, 11...
Belt guide, 11a... guide surface, 17... drive pulley, 20... drive shaft.

Claims (1)

[Claims for Utility Model Registration] A drive pulley is rotatably mounted between a pair of side frames made of synthetic resin, a belt guide made of synthetic resin is formed adjacent to the drive pulley between the side frames, and the belt guide made of synthetic resin is formed between the side frames. An endless feed belt with feed pins protruding at a predetermined pitch is stretched between two linear guide portions formed on the drive pulley and the belt guide, and an arcuate guide portion formed between the linear guide portions. , a paper feeding device that causes the feeding belt to travel in its longitudinal direction on guide surfaces of a linear guide portion and an arcuate guide portion of the belt guide by rotationally driving the drive pulley, The width of the guide surfaces of the circular guide portion and the arcuate guide portion is approximately the same as the diameter of the feed pin formed on the feed belt, and a plurality of holding protrusions are integrally protruded on both sides of the guide surface in the width direction. the holding protrusion is abutted against the pair of side frames, and the guide surface is positioned approximately in the center between the side frames so as to separate the side frames from each other. A belt guide surface for guiding a side edge of the feed belt is formed on mutually opposing surfaces of the pair of side frames at a position corresponding to a linear guide portion of the belt guide. A paper feeding device characterized by: