JPH056133Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a paper feeding device for a printer, and in particular,
A paper feeding device that feeds printing paper, in which a large number of feeding holes having a predetermined interval are arranged in rows on both left and right sides, by a pair of pin tractors, the pair of pin tractors depending on the paper width of the printing paper. This paper relates to a paper feeding device that can change the distance between paper feeders.

[Prior Art] Conventionally, this type of paper feeding device has a rotatable drive shaft extending in the width direction of the printing paper, and an auxiliary shaft provided parallel to the drive shaft, and has a sliding mechanism on both the shafts. A pin tractor includes a base movably inserted therein, and a rotating part rotatably supported by the base and rotatably inserted through the drive shaft and having a plurality of pins on the outer periphery, and a separate member is attached to the base. Generally, a clamp mechanism or the like is attached as a positioning device consisting of a pin tractor, and the pin tractor is positioned and fixed by the clamp mechanism. For printing paper of different widths, the operator slides the pin tractor on both shafts with the clamp mechanism released, and positions the pin of the rotating part to engage with the feed hole of the printing paper. The position of the pin tractor is determined by adjusting the pin tractor while making sure that it is in the correct position, and when it is located at the appropriate position, the clamp mechanism is activated to fix the base.

[Problems to be solved by the invention] In the conventional paper feeding device described above, an auxiliary shaft is required in addition to the drive shaft to prevent the base from rotating around the drive shaft. Since positioning was performed by attaching a clamping mechanism made of a separate member to the holder, there were problems such as not only a large number of parts but also a complicated structure. Furthermore,
The positioning work was very complicated because the operator had to adjust the position of the pin tractor so that the pins would engage with the feed holes for different widths of printing paper. Moreover, due to individual differences among workers, the position of the pin tractor is not constant, resulting in quite a few subtle errors.

[Purpose of the invention] This invention was created in view of the above-mentioned problems.
To provide a paper feeding device at low cost that does not require a positioning means consisting of an auxiliary shaft or a clamp mechanism of a separate member, and moreover enables reliable positioning of a pin tractor with simple work.

[Means for solving the problem] In order to achieve the above purpose, in the present invention,
A rotating device in which a drive shaft, which is provided so as to be able to rotate the platen integrally, is horizontally supported in the width direction of the printing paper and pivotally supported on the frame of the printer, and has a plurality of pins on the outer periphery that can be engaged with the feed holes of the printing paper. a protruding bar that is slidably and integrally rotatably inserted into the drive shaft at both end sides of the platen, rotatably supports the rotary part, and is integrally formed and protrudes to the outside, and has a slot; A positioning portion that slidably inserts a base portion having a shape into the drive shaft, is formed at a predetermined interval in the axial direction of the drive shaft, and elastically engages with the protruding bar to non-rotatably support the base portion. The frame is provided with an engaging portion which is an elongated hole having a connecting hole having a width narrower than the positioning portion that connects the positioning portions.

[Function] In the above configuration, the plurality of positioning parts of the engaging part are arranged in a row at intervals corresponding to each of the plurality of types of printing paper having different paper widths. The pin tractor consisting of a rotating section and a rotating section can be easily and reliably positioned according to the printing paper by simply selectively elastically engaging the protruding bar at the base with one of the plurality of positioning sections.

[First Embodiment] A first embodiment embodying the present invention will be described below with reference to FIGS. 1 to 6.

A frame 60 of the printer supports a drive shaft 10 that is rotationally driven by a motor (not shown), and a platen 11 is provided on the drive shaft 10 so as to be rotatable therewith.

A carriage 71 is slidably inserted into a guide bar 70 that is provided parallel to the drive shaft 10 . A paper meter 72 is integrally formed on the carriage 71, and the paper meter 72 is connected to a ribbon guide 74 that guides the ribbon R.
and a printing window 73 provided at the center of the ribbon guide 74. A printing head 80 placed on the carriage 71 and facing the printing window 73 prints via the ribbon R, and performs a printing operation while reciprocating the carriage 71 by a motor (not shown). I do.

A platen 1 made of synthetic resin is attached to the drive shaft 10 so as to be connected to both left and right end surfaces of the platen 11.
A pair of left and right rotating parts 20 (only the right one is shown) having the same diameter as the cylinder part 21 are slidably inserted through the cylinder part 21. Moreover, this rotating part 20 is rotated integrally with the drive shaft 10 by the engagement between the rotation stop part 22 provided on the inner circumferential surface of the cylindrical part 21 and the locking part 12 of the drive shaft 10. There is. A plurality of guide grooves 23 are formed on the outer surface of the rotating portion 20 so as to extend radially around the axis of the drive shaft 10 and open at the outer peripheral surface of the rotating portion 20 . Further, a plurality of elastic locking pieces 25 are integrally formed on the cylindrical portion 21 through slits 24, and locking claws 26 are provided at the tips of the elastic locking pieces 25 to project outward.

A pin body 40, which is shown in detail in FIG. 2, is detachably attached to the rotating part 20. This pin body 40 is connected to each of the guide grooves 23 of the rotating section 20.
a slider portion 41 that is slidably fitted into the paper, and feed holes H1 and H2 that are arranged in multiple rows at predetermined intervals on both the left and right sides of the printing paper (see FIGS. 5 and 6).
A conical pin 42 that can be engaged with the cylindrical pin engaging portion 43 and a cylindrical pin engaging portion 43 are integrally formed of synthetic resin. Note that the operation of this pin body 40 will be explained later.

The cylindrical part 21 of the rotating part 20 is rotatably inserted into the insertion hole 31 of the base part 30 made of synthetic resin, and is held by the locking claws 26 of the elastic locking pieces 25 to prevent it from coming out. . The cylindrical pin engaging portion 43 is fitted into the inner surface of the base portion 30, and an annular cam groove 32 is eccentric with respect to the axis of the drive shaft 10.
(See Figure 3) is engraved. This cam groove 3
2 is a small diameter cam portion on the printing head 80 side with the vertical plane passing through the axis of the drive shaft 10 as a boundary, and on the opposite side is a large diameter cam portion that smoothly continues from the small diameter cam portion. Further, on the outer surface of the base 30, a cylindrical protruding bar 34 having a slot 33 is provided.
is integrally provided in a protruding manner, and a substantially flat knob 35 is provided.

Note that the above-mentioned rotating portion 20, base portion 30, and plurality of pin bodies 40 constitute a pin tractor 90.

A paper guide plate 50 integrally formed with the frame 60 so as to cover the lower half of the platen 11 guides printing paper (not shown in FIG. 1) onto the platen 11.
guide along the outer periphery of the As shown in FIGS. 3 and 4, the protruding bar 34 of this guide plate 50
A plurality of positioning portions 51 and 52, which are holes having approximately the same diameter as the protruding bar 34, are arranged in a row at an interval corresponding to each of a plurality of types of printing paper having different paper widths. has been done. Further, the positioning parts 51 and 52 are connected by a connecting hole 53 having a width smaller than the diameter thereof, and the engaging part 54 forms one elongated hole as a whole. 3 and 4 show a state in which the protruding bar 34 is elastically engaged with one of the positioning portions 51. FIG. Grasp the knob 35 and turn the pin tractor 90
When the protruding bar 34 is biased in the direction of arrow B, the protruding bar 34 is guided into the connecting hole 53 while the interval between the slots 33 is narrowed against its elasticity. When moving further in the direction of arrow B and reaching the other positioning part 52, the protruding bar 34 is released and engages with the positioning part 52. By performing this operation in the reciprocating direction and selectively elastically engaging the protruding bar 34 with either of the positioning parts 51 and 52, the pin tractor 9
0 positioning is easily and reliably performed. Note that the protruding bar 34 also has the function of preventing the base portion 30 from rotating around the drive shaft 10 by engaging with the engaging portion 54.

Next, the operation of the present invention will be explained with reference to FIGS. 5 and 6.

FIG. 5 shows a state in which a narrow width printing paper P1 is attached. At this time, the left and right pin tractors 90
The protruding bar 34 is engaged with the positioning portion 51. Since the distance between the left and right positioning parts 51 is set in advance in accordance with the printing paper P1, the pin 4
2 is in a position to engage with the feed hole H1.

FIG. 6 shows a state in which a wide width printing paper P2 is attached. In order to change the state from the state shown in FIG. 5 to the state shown in FIG.
0 in the direction of arrow B to engage the protruding bar 34 with the positioning portion 52. The distance between the positioning parts 51 and 52 of the engaging part 54 is the same as that of the printing papers P1 and P2.
In this state, the pin 42 is at a position where it engages with the feed hole H2.

In this way, the operator can move the pin tractor 90 while holding the knob 35 and selectively elastically engage the protruding bar 34 with one of the plurality of positioning parts 51 and 52, and the operator can adjust the pin tractor 90 according to the printing paper. positioning can be done easily and reliably.

Here, the paper feeding action of the pin tractor 90 will be explained with reference to FIGS. 1, 5, and 6.

When the rotating part 20 and the pin body 40 are rotated together in the direction of arrow A in FIG. 1 as the drive shaft 10 rotates, the base part 30 fixed to the paper guide plate 50
Each pin body 40 corresponding to the large-diameter cam portion of the cam groove 32 is positioned at a position where the pin 42 protrudes from the outer peripheral surface of the rotating portion 20 due to engagement between the large-diameter cam portion and the pin engaging portion 43. The pins 42 engage with the feed holes H1, H2 of the print sheets P1, P2, and the print sheets P1, P2 are fed in the direction of arrow A. on the other hand,
Each pin body 4 corresponding to the small diameter cam portion of the base portion 30
0, the pins 42 are held in a position recessed from the outer peripheral surface of the rotating part 20 due to the engagement between the small diameter cam and the pin engaging part 43, and contact between each pin 42 and the paper meter 72 is prevented. Ru. In this way, as the drive shaft 10 rotates, each pin 42 is reciprocated in the radial direction of the drive shaft 10 and is moved in and out of the outer peripheral surface of the rotating part 20. In this case, each of the sliders 41 moves along the guide groove 23. In order to slide, the printing paper P1,
There is no fear that the engagement position of each pin 42 with respect to the feeding holes H1, H2 of P2 will shift, and the printing papers P1, P2 can be fed accurately and reliably.

[Second Embodiment] Hereinafter, the protruding bar 34 and the engaging portion 54 of the first embodiment will be explained.
A second embodiment obtained by modifying the above will be described with reference to FIG. In addition, in FIG. 7, the drive shaft 10, platen 11, rotating part 20, pin body 40, frame 60
Since each member has the same structure as in the first embodiment, the same reference numerals will be used and detailed explanation will be omitted.

The base 130 has the same structure as the base 30 of the first embodiment with respect to the cam groove 132 carved on the inner surface, the knob 135 provided on the outer surface, and the method of attachment to the rotating part 20. This base 13
A pair of protruding bars 134 having slots 133 and engagement protrusions 136 that protrude small on the opposing surfaces between them are integrally provided on the outer surface of the bar.

The paper guide plate 150 has the protruding bar 134
The rail 15 located between the slots 133
4 are integrally provided. This rail 154
A plurality of engagement recesses 151 and 152 that can fit into the engagement protrusion 136 are arranged in a row on the side surface at intervals corresponding to each of a plurality of types of printing paper having different paper widths. ing.

Note that the above-mentioned rotating portion 20, base portion 130, and a plurality of pin units 40 jointly operate the pin tractor 19.
It constitutes 0.

Now, when loading narrow width printing paper,
The engagement protrusion 136 and the engagement recess 151 are elastically fitted. At this time, a pair of left and right engaging recesses 151 provided on both sides of the platen 11 (only the right side is shown)
Since the distance between the two pins 42 is preset to correspond to the narrow width printing paper, the pin 42 is in a position to engage with the feed hole of the printing paper. Next, when reloading a wider printing paper from this state, hold the knob 135 and use the pin tractor 190.
is urged in the direction of arrow C against the elastic fitting, and the connecting portion 153 on the side surface of the rail 154 is slid while widening the interval between the slots 133, so that the engaging protrusion 136 is fitted into the engaging recess 152. let The distance between the engagement recesses 152 of the rail 154 is predetermined to correspond to a wide width of printing paper, so in this state, the pin 42
is arranged at a position that engages with the feed hole of the wide printing paper.

In this way, the pin tractor 190 is moved, and the engagement convex portion of the protruding bar 134 is moved into the plurality of engagement concave portions 15.
1, 152, the pin tractor 190 can be easily and reliably positioned according to the printing paper.

[Effects of the invention] As detailed above, in the present invention, a drive shaft on which the platen is rotatably provided is pivotally supported on the frame, and a pin tractor can be slid on the drive shaft at both ends of the platen. In addition, a protruding bar that is inserted through the pin tractor so as to be integrally rotatable and that is formed integrally with the base of the pin tractor and has a slot is provided, and a positioning portion that elastically engages with the protruding bar and a positioning portion are provided on the frame. An engaging portion is provided which is a long hole having a connecting hole narrower in width than the positioning portion to be connected, and the protruding bar is selectively engaged with one of the positioning portions, thereby adjusting the width of the printing paper. Since the positioning of the pin tractor is carried out, there is no need for a positioning means consisting of an auxiliary shaft or a clamp mechanism of a separate member, and the structure can be made simple and compact, and the pin tractor can be positioned reliably with simple work. This makes it possible to provide a paper feeding device at a low cost.

[Brief explanation of the drawing]

1 to 6 show a first embodiment embodying the present invention, FIG. 1 is a partially exploded perspective view of the first embodiment, FIG. 2 is a perspective view of the pin body, and FIG. 3 is a schematic view of the main body. Figure 4 is a cross-sectional view taken along the line 4-4 in Figure 3, Figure 5 is a cutaway side view when narrow width printing paper is installed and its equivalent view in Figure 4, Figure 6 is a wide sectional view. FIG. 4 is a cutaway side view and a view corresponding to FIG. 4 when a width of printing paper is attached. FIG. 7 is a partially exploded perspective view of a second embodiment embodying the present invention. In the figure, 10 is a drive shaft, 11 is a platen, 20 is a rotating part, 30 is a base, 32 is a cam groove, 33 is a slot, 34 is a protruding bar, 42 is a pin, 51 and 52 are positioning parts, and 54 is an engaging part. Joint part, 60 is frame, P
1 and P2 are printing paper, and H1 and H2 are feed holes.

Claims (1)

[Claims for Utility Model Registration] 1. A large number of perforations H1, H2 having a predetermined interval
In a paper feeding device of a printer that feeds printing papers P1 and P2 arranged in rows on both left and right sides, a drive shaft is supported horizontally in the width direction of the printing papers P1 and P2 and is pivotally supported on the frame 60 of the printer. 10, a platen 11 that is rotatably provided on the drive shaft 10, and a platen 11 that is slidably and rotatably inserted into the drive shaft 10 on both sides of the platen 11, and has the feed hole H1 in its outer periphery. . a base 30 having a protruding bar 34 having a slot 33; formed on the frame 60 at a predetermined interval in the axial direction of the drive shaft 10 and elastically engaged with the protruding bar 34 to support the base 30; Positioning parts 51 and 52 that support the positioning parts in a non-rotatable manner, and positioning parts 51 and 52 that connect the positioning parts 51 and 52.
52. A paper feeding device characterized by comprising: a connecting hole 53 whose width is narrower than that of the engaging portion 54, which is an elongated hole. 2. The base 30 has an eccentric cam groove 32,
The paper feeding device according to claim 1, wherein the pin 42 rotates while engaging with the cam groove 32, thereby retracting and protruding from the outer periphery of the rotating portion 20.