JPH0233310B2 - INJISOCHI - Google Patents

Description

[Detailed description of the invention] Technical field of invention The present invention relates to a printing device.

Technical background of the invention and its problems In a printing device, the minimum necessary main mechanisms include a platen, a carrier, a carrier shaft that guides the carrier, a paper feed mechanism, a pinch roller mechanism, and other motors. Also,
A plurality of frame structures are provided to support these mechanisms, including a pair of left and right side frames, a base that serves as a bottom plate, and a paper guide plate that also serves as a strength member of the frame structure. As a result, the number of parts increases and assembly work becomes troublesome.

Purpose of the Invention This invention has been made in view of the above points, and it is possible to reduce the number of parts and facilitate assembly work.
Another object of the present invention is to provide a printing device in which the rigidity of the main frame structure can be increased, and in particular, the paper feed unit can be easily attached.

Summary of the Invention This invention provides a main frame in which a pair of left and right side frames, a base, and a paper guide are integrally formed, thereby increasing the rigidity of the main frame and reducing the number of main frame components. , a paper feed unit is provided in which at least a feed roller and a paper feed motor are attached to a paper feed frame, and the protrusion is engaged with a locking hole formed on the facing surface of the paper feed frame and the side frame to feed the paper. The left and right movement of the feed frame is fixed, the paper feed frame is slid in the front and back direction, and a part of this paper feed frame is pressed down by a pressing part formed integrally with the side frame to prevent it from floating. , the movement of the paper feed frame in the front and back direction is fixed by the stopper part, and therefore the paper feed unit is attached to the main frame with an extremely small number of screws even if screws are used, and When attaching the feed motor to the paper feed frame via the motor support plate, fit one end of the motor support plate into the groove formed in the side frame to increase the support strength of the motor support plate and attach it to the paper feed frame. In addition, side guides are formed protruding on both sides of the surface of the paper guide, and notches are formed on both sides of the paper feed frame to allow these side guides to escape. The recording paper is configured so that both sides of the recording paper can be guided by side guides without using a guide member.

Embodiment of the Invention An embodiment of the invention will be described based on the drawings.
Reference numeral 1 denotes a platen, and at both ends of the platen 1 there are projecting pieces 5 having a mounting hole 3 into which a screw 2 is inserted and a long hole 4.
is formed.

6 is a carrier unit. This carrier unit 6 includes a carrier 9 that holds a ribbon cassette (not shown) using a dot head 7 and a clamp 8 as a printing mechanism, a timing belt 9a that is partially fixed to the carrier 9, and a timing belt 9a that allows the carrier 9 to slide freely. Carrier shaft 10 to hold
It consists of a holder 11 that rotatably holds an eccentric cam (not shown) fixed to both ends of the carrier shaft 10, and an adjustment lever 12 fixedly fitted to one end of the carrier shaft 10. A ribbon drive shaft 13 is supported on the carrier 9. Third
As shown in the figure, the lower surface of the carrier 9 includes a pulley 14 that converts the linear motion of the carrier 9 in one direction into rotational motion, a gear 15 that transmits the rotation of the pulley 14 to the ribbon drive shaft 13, etc. Mechanism 16
is attached, and a cover 17 covering this transmission mechanism 16 is attached.
is provided. This cover 17 is made of elastic synthetic resin, and the shaft portion of a roller 18 is elastically fitted to the lower surface of this cover 17. Further, the cover 17 is integrally formed with a plurality of locking claws 19 that protrude upward and a locking claw 20 that hangs downward, and as shown in FIG.
9 is resiliently engaged with a locking hole 21 formed in the carrier 9. Furthermore, the holders 12 that hold both ends of the carrier shaft 10 are made of elastic synthetic resin, and locking claws 22 are integrally formed on these holders 12.

Further, a pulley 24 is connected to the carrier motor 23, and a pulley 25 forming a pair with this pulley 24 is held by an L-shaped metal fitting 26.

A paper feed unit 27 is then provided. That is, a paper feed frame 30 made of sheet metal is provided, in which a paper guide surface 28 and a pair of left and right side plates 29 are integrally formed.
The shaft 34 of No. 3 is rotatably held. A tractor 35 for feeding sprocket paper is held on the guide shaft 31 and the drive shaft 32. Drive shaft 32
Gear 36 and shaft 3 of feed roller 33 fixed to
A paper feed motor 38 that drives a gear 37 fixed to the paper feed motor 38 has an upper end held by a motor support plate 39 screwed to the left side plate 29. In addition, a notch 40 and a locking piece 41 are formed at the lower sides of the paper feed frame 30, and a locking hole 42 and a mounting hole 4 into which a screw 43 is inserted are formed at the upper side of the paper feed frame 30.
4 and a tongue piece 45 are formed.

Next, as shown in FIG. 2, a pinch roller unit 46 is provided. This pinch roller unit 46 is connected to the shaft 48 of the pinch roller 47.
two roller arms 49 holding both ends of the
An operating shaft 50 fitted to these roller arms 49, an intermediate lever 51 fixed to one end of this operating shaft 50, and an intermediate lever 51 that connects the operating shaft 5 through the intermediate lever 51.
The control lever 52 is connected to the control lever 52. Bosses 53 are formed on one side of the roller arm 49 to fit into the operating shaft 50, and these bosses 53 are formed with slits 55 that engage with spring pins 54 press-fitted into the operating shaft 50 to prevent rotation. has been done. The intermediate lever 51 is also formed with a boss 56 that is fitted onto one end of the operating shaft 50, and this boss 56 is formed with a slit 55 that is prevented from rotating by a spring pin 54 press-fitted into the operating shaft 50. Further, the intermediate lever 51 is formed with two recesses 57 and 58, and the operating lever 52 has a protrusion 59 that engages with either one of the recesses 57 and 58, and a protrusion 59 that engages with one of the recesses 57 and 58.
an extension surface 60 facing the side surface of 1 and an intermediate lever 51
A bent piece 61 facing the lower edge of is integrally formed.

Thus, a main frame 62 made of aluminum die-casting is provided. This main frame 6
2 is a pair of left and right side frames 63 and a base 64
and a paper guide 65 facing the paper guide surface 28 of the paper feed frame 30. Platen 1 is attached to the side frame 63.
Supports 66 are integrally formed as attachment parts, and these supports 66 have protrusions 67 that fit into the long holes 4 of the platen 1 to prevent the platen 1 from moving in the left-right direction, and the mounting holes 3. A screw hole 68 facing the is integrally formed. Furthermore, a hook portion 69 is formed on the side frame 63 as a mounting portion for the carrier shaft 10 and elastically engages with the locking pawl 22 of the holder 11.

The base 64 is formed with a rail portion 70 that supports the roller 18 of the carrier unit 6 and a locking edge 71 that elastically engages with the locking pawl 20.

Further, a U-shaped mounting hole 72a is formed in the left side frame 63 as a mounting portion for the carrier motor 23, into which a screw 72 protruding from the carrier motor 23 is inserted. A nut 73 is screwed into the screw 72. Further, a mounting seat 74 is formed on the right side frame 63 to which a metal fitting 26 for holding the pulley 25 is screwed.

Furthermore, a mounting base 7 is provided at the rear of the left and right side frames 63 as a mounting portion for the paper feed unit 27.
5 are integrally formed, and these mounting bases 75 have an upwardly extending portion that engages with the locking hole 42 to stop the paper feed frame 30 from moving in the left-right direction and only allows movement in the front-back direction. Extending protrusion 7
6, a pressing portion 76a bent rearward from the top of the protrusion 76, and a screw hole 77 corresponding to the mounting hole 44.
A pressing portion 78 is formed integrally with both side frames 63, as shown in FIG. 5, in order to press the tip of the locking piece 41. Furthermore, a groove 79 into which the lower end 39a of the motor support plate 39 is fitted is formed in the left side frame 63. Furthermore, side guides 80 are integrally formed on both sides of the paper guide 65 of the main frame 62 to guide both side edges of the paper.
These side guides 80 protrude upward from the notches 40 formed in the paper feed frame 30.

Next, as shown in FIG.
A fitting part 81 that rotatably fits one end of the paper guide 65 is integrally formed on the back surface of the paper guide 65, and a fitting part 82 that rotatably fits the boss 56 of the intermediate lever 51 is located on the right side. side frame 6
3, and a support shaft 83 that rotatably holds the operation lever 52 on the right side frame 63 and a presser piece 84 that prevents the operation lever 52 from coming off from the support shaft 83 are integrated. is formed. Further, on the back side of the paper guide 65, there is a receiving part 86 for receiving the coil spring 85 fitted to the rear part of the roller arm 49, and a receiving part 86 for receiving the coil spring 85 fitted to the rear part of the roller arm 49, and the operating shaft 5.
A receiving portion 87 that supports the roller arm 49 and arm guides 88 that guide both sides of the roller arm 49 are integrally formed. Further, the feed roller 33 and the pinch roller 47 are located below the paper guide 65.
A plurality of notches 89 are formed for positioning the. The paper feed frame 28 is also formed with notches corresponding to these notches 89.

Returning to FIG. 1, switch mounting pieces 90 and 91 are integrally formed on both sides of the base 64.
One switch mounting piece 90 is a detection switch (not shown) that detects the home position of the carrier 9.
and the other switch mounting piece 9.
0 is for installing a safety switch (not shown) that detects a state in which the carrier 9 has moved excessively to the right and stops the carrier motor 23.

Further, an adhesive surface 93 to which a Mylar sheet 92 is attached is integrally formed on the lower edge of the paper guide 65. This mylar sheet 92 presses the paper inserted between the paper guide 65 and the paper guide surface 28 against the platen 1.

In such a configuration, the platen 1 is attached by fitting the elongated holes 4 at both ends into the protrusions 67 of the support columns 66 and screwing the screws 2 inserted into the mounting holes 3 into the screw holes 68 of the support columns 66.

The carrier unit 6 is connected to the locking claw 22 of the holder 11.
is attached to the main frame 62 by resiliently engaging the hook portion 69. The roller 18 is supported by the rail portion 70 of the base 64, but the locking claw 2
0 to the locking edge 71 of the base 64, it is possible to prevent the rear part of the carrier 9 from floating. Thereby, the carrier unit 6 can be easily attached to the main frame 62 using tools.

Then, screw the metal fitting 26 to the mounting seat 74,
The screws 72 of the carrier motor 23 are passed through the mounting holes 72a, nuts 73 are screwed onto these screws 72, and the timing belt 9a is wound around the pulleys 24 and 25.

The paper feed unit 27 fits the locking hole 42 of the paper feed frame 30 into the protrusion 76, slides the paper feed frame 30 forward toward the platen 1, and presses the tip of the locking piece 41 with the pressing portion 78. It is assembled by screwing the rear edge of the locking hole 42 into the screw hole 77 with the screw 43 inserted into the presser attachment hole 44 using the pressing portion 76a. As shown in FIG. 5, the paper feed frame 30 is prevented from floating upward by the pressing parts 76a and 78 unless it moves backward, so even if the screw 43 is omitted, the tongue piece 45 can be folded downward. The paper feed frame 30 can be fixed simply by bending to prevent the paper feed frame 30 from moving backward. That is, the bent tongue piece 45 and the screw 43 screwed into the screw 77 stop the backward movement of the paper feed frame 30 and engage a part of the paper feed frame 30 with the pressing parts 76a and 78. It functions as a stopper to maintain the condition. Either one of the screw 43 and the tongue piece 45 may be provided. In this state, the lower end 39a of the motor support plate 39 is connected to the groove 77 of the side frame 63.
Since it is held in place, it can be securely fixed in a state where it is held on both sides to prevent swinging. Therefore, the number of attachment points for the motor support plate 39 to the paper feed frame 30 can be reduced.

The pinch roller unit 46 is attached as follows. First, two roller frames 4
9 is connected to the operating shaft 50 , the boss 56 of the intermediate lever 51 is fitted into the fitting portion 82 , and the other end of the operating shaft 50 is fitted, and the spring pin 54 is operated. The shaft 50 and the intermediate lever 51 are prevented from rotating. At this time, the receiving portion 87 is connected to the operating shaft 50.
The operating shaft 50
The fitting of the intermediate lever 51 to the fitting portion 81 and the fitting of the intermediate lever 51 to the fitting portion 82 and the operating shaft 50 can be easily performed with their axes aligned. Also, at this time, the roller arm 49 is inserted into the arm guide 88 and the coil spring 85 is supported by the receiving part 86. Next, the operating lever 52 is placed in a substantially horizontal state, fitted onto the support shaft 83 of the right side frame 63, and then rotated to a substantially vertical position. As a result, the holding piece 84 prevents the operation lever 52 from coming off from the support shaft 83, and the extension surface 6 of the operation lever 52
0 prevents the intermediate lever 51 from coming off from the joint portion 82 and the operating shaft 50. Thereby, the pinch roller unit 46 can be easily attached to the main frame 62 without using tools.

During printing, the carrier motor 23 drives the timing belt 9a to move the carrier 9 along the platen 1. When printing on sprocket paper, the pinch roller 47 is separated from the feed roller 33. That is, as shown in FIG.
When engaged, the intermediate lever 51 rotates counterclockwise, causing the operating shaft 50 and the roller arm 49 to rotate counterclockwise. As a result, the pinch roller 4
7 retreats downward. In this state, the sprocket paper is intermittently fed by the tractor 35.
When feeding paper other than sprocket paper, rotate the operating lever 52 in the opposite direction of arrow A, rotate the intermediate lever 49, operating shaft 50, and roller arm 49 clockwise by the restoring force of the coil spring 85. Pinch roller 47 to feed roller 3
3.

In this way, the main frame 62 is formed by integrally forming the side frame 63, the base 64, and the paper guide 65, and therefore has high rigidity.
It is possible to reduce the number of parts and promote labor saving in assembly work.

Effects of the Invention As described above, this invention forms a main frame by integrating a pair of left and right side frames, a base, and a paper guide, thereby increasing the rigidity of the main frame and reducing the number of component parts of the main frame. In addition, the lateral movement of the paper feed frame of the paper feed unit is prevented by the engagement between the locking hole and the protrusion, and the unidirectional movement of the paper feed frame in the front and back direction is prevented by the stopper part. However, by preventing the paper feed frame from floating with the pressing part, the paper feed unit can be easily attached to the main frame with just a few screws, and the motor support can be attached to the paper feed frame. Even when installing the paper feed motor through a plate, the support strength can be increased by fitting one end of the motor support plate into the groove formed in the side frame, which allows the motor support plate to be attached to the paper feed frame. Assembling can be further simplified by reducing the number of attachment points, and furthermore, by forming side guides protruding on both sides of the paper guide, it is possible to guide both side edges of the recording paper without using a separate guide member. It has the effect that it can be done.

[Brief explanation of drawings]

The drawings show one embodiment of the invention.
The figure is an exploded perspective view, Figure 2 is an exploded perspective view from the back showing how the pinch roller unit is installed, and Figure 3 is an exploded perspective view.
The figure is an enlarged vertical right side view, FIG. 4 is an enlarged side view of the pinch roller unit, and FIG. 5 is an enlarged vertical left side view showing the attached state of the paper feed frame. 1...Platen, 6...Carrier unit, 7
...Dot head (printing mechanism), 9...Carrier,
10...Carrier shaft, 23...Carrier motor, 27...Paper feed unit, 30...Paper feed frame, 33...Feed roller,
38... Paper feed motor, 40... Notch, 42... Locking hole, 43... Screw (stopper part), 45... Tongue piece (stopper part), 46... Pinch roller unit, 47... Pinch Laura, 4
9...Roller arm, 52...Operation lever, 6
2...Main frame, 63...Side frame, 64...Base, 65...Paper guide,
76... Protrusion, 76a... Pressing part, 78... Pressing part, 79... Groove, 80... Side guide.

Claims (1)

[Scope of Claims] 1. A carrier unit in which a carrier equipped with a printing mechanism is slidably fitted to a carrier shaft, a platen, a carrier motor that drives the carrier, a roller arm holding a pinch roller, and an operation. a pinch roller unit having a lever, a main frame integrally formed with a pair of left and right side frames, a paper guide for supporting recording paper to be fed to the platen, and a base facing the carrier unit; The carrier unit, the platen, the carrier motor, and the pinch roller unit are attached to the paper feed frame facing the paper guide, and a feed roller that contacts at least the pinch roller and a paper feed motor that drives the feed roller are attached to the paper feed frame that faces the paper guide. A paper feed unit is provided with a paper feed unit attached thereto, and protrusions and locking portions that engage with each other on opposing surfaces of both sides of the paper feed frame and the side frame to allow movement of the paper feed frame only in the front and back direction. A hole is formed to press a part of the paper feed frame and prevent the paper feed frame from floating from the paper guide when the paper feed frame is slid in either the front or rear direction. A pressing part is integrally formed with the side frame, and movement of the paper feed frame in the front and back direction is fixed on opposing surfaces of the side frame and the paper feed frame, so that the pressing part and the paper feed frame are connected to each other. 1. A printing device characterized in that a stopper portion is provided for maintaining the two in an engaged state. 2. A carrier unit in which a carrier equipped with a printing mechanism is slidably fitted onto a carrier shaft, a platen, a carrier motor for driving the carrier, a roller arm holding a pinch roller, and a pinch roller unit having an operation lever. A main frame is provided in which a pair of left and right side frames, a paper guide for supporting recording paper to be supplied to the platen, and a base facing the carrier unit are integrally formed, and the carrier unit and the main frame are mounted on the main frame. A motor support for attaching a platen, the carrier motor, and the pinch roller unit, attaching at least a feed roller that contacts the pinch roller to a paper feed frame facing the paper guide, and holding a paper feed motor that drives the feed roller. A paper feed unit having one end of a plate connected to one side of the paper feed frame is provided, and the paper feed unit engages with both sides of the paper feed frame and the opposing surfaces of the side frame to move the paper feed frame in the front-rear direction. A protrusion and a locking hole are formed to allow movement only in the direction of the paper feed frame, and when the paper feed frame is slid in either the forward or backward direction, a part of the paper feed frame is held down and the paper feed frame is A pressing part that prevents the paper feed frame from floating from the paper guide is integrally formed on the side frame, and a pressure part that prevents the paper feed frame from moving in the front and back direction is formed on the opposing surface of the side frame and the paper feed frame. A stopper portion is provided to fix and maintain the pressing portion and the paper feed frame in an engaged state, and a groove for holding the other end of the motor support plate is integrally formed in the one side frame. Characteristic printing device. 3. A carrier unit in which a carrier equipped with a printing mechanism is slidably fitted onto a carrier shaft, a platen, a carrier motor for driving the carrier, a roller arm holding a pinch roller, and a pinch roller unit having an operation lever. A main frame is provided in which a pair of left and right side frames, a paper guide for supporting recording paper to be supplied to the platen, and a base facing the carrier unit are integrally formed, and the carrier unit and the main frame are mounted on the main frame. A paper feeding unit in which a platen, the carrier motor, and the pinch roller unit are attached, and a paper feed frame facing the paper guide is attached with at least a feed roller that contacts the pinch roller and a paper feed motor that drives the feed roller. forming a protrusion and a locking hole on opposing surfaces of both sides of the paper feed frame and the side frame that engage with each other to allow movement of the paper feed frame only in the front-rear direction; The side frame includes a pressing portion that presses a part of the paper feed frame to prevent the paper feed frame from floating from the paper guide when the paper feed frame is slid in either the front or back direction. the paper feed frame is integrally formed with the side frame and the paper feed frame, and the front and back movement of the paper feed frame is fixed on opposing surfaces of the side frame and the paper feed frame, so that the pressing part and the paper feed frame are in an engaged state. A stopper portion for maintaining the paper feed frame is provided, side guides for guiding both side edges of the recording paper are integrally formed on both sides of the surface of the paper guide, and notches for letting the side guides escape are formed on both sides of the paper feed frame. A printing device characterized in that: