JPS609793A - Carrier for printer - Google Patents

Abstract

PURPOSE:To reduce the number of motors to be provided, simplify construction and contrive to reduce size and weight, by a method wherein displacement of a printing head to a printing position, displacement of a plurality of ribbons to a printing position and displacement of only a required one of the ribbons to a ribbon-feeding position are effected by a single motor. CONSTITUTION:A lifting cam 50 is rotated only in the direction corresponding to the forward rotation of the motor 49. In a printing operation, a ribbon holder 29 is located at a lower position. In a correcting operation, the cam 50 is rotated by a half rotation by forwardly rotating the motor 49, thereby turning a lever 62 to displace the ribbon holder 29 to an upper position. On the other hand, a head cam 81 and a feed-releasing cam 82 are rotated only in directions corresponding to the reverse rotation of the motor 49. Therefore, when returning a carrier frame 1 to a required position, the motor 49 is reversely rotated, the cams 81, 82 are rotated in predetermined directions to displace the printing head 72 to a non- printing position, and engagement of clutches 19, 18 is released to stop the feeding of the ribbon.

Description

[Detailed description of the invention] The present invention relates to a carrier for a printing machine.

Conventionally, in general, the movement of the print head to the printing position and the actuation of multiple ribbons to the printing positions were performed by separate motors, and when there were multiple print ribbons, the print ribbon and the collection ribbon were each fed separately. Since the ribbon is fed by a mechanism, the structure is complicated, and since many motors are installed, it is not only expensive but also large and heavy.

Further, in the case where a plurality of ribbons are simultaneously fed by one feeding mechanism, although the feeding mechanism is simplified, there is a waste in that unnecessary ribbons are also fed.

The present invention displaces the print head to the printing position and the plurality of ribbons to the printing position using one motor, and also displaces only the required ribbon among the plurality of ribbons to a position where ribbon feeding is possible. This is to prevent other ribbons from being fed unnecessarily, and its purpose is to eliminate five of the above-mentioned drawbacks of the conventional ribbon at once.

The illustrated embodiment will be described below.

Reference numeral 1 denotes a carrier frame having a rectangular planar shape, which has a bottom plate 6 stretched under the front and rear side plates 2.3 and left and right side plates 4.5, and bearings on the front sides of the left and right side plates 4.5. 7.8, and a pair of upper and lower sliders 9, 10 are provided on the rear side plate 3.
.

The carrier frame 1 is slidably mounted on rods 12 and 13 which are horizontally suspended behind and parallel to the platen 11. That is, the rod 12 is provided with the bearing 7. ．． 8
By slidingly fitting the rods 13 and sandwiching the rods 13 between the sliders 9 and 1o, the carrier frame 1 is constructed of a known type that is driven by a motor (not shown) attached to the main body of the printing machine. It moves from side to side while being towed by a carrier cord (not shown).

The rod 13 has a circular cross section and a rack 14 on its front vertical surface.

Reference numerals 15 and 16 denote ribbon feed shafts, which are rotatably installed on the bottom plate 6 at a required distance from each other left and right.
Drive pawls 17 are provided, and clutches 18 and 19 are provided on the lower side.
has been established.

The clutch 18 is annular and has saw teeth 2o on its lower surface, and is fitted to the ribbon feed shirt 16 so as to rotate integrally therewith.

The clutch 19 has a cylindrical shape, and is provided with saw teeth 21 on the upper surface that mesh with the saw teeth 2°, a gear 22 (3) on the upper circumferential side, and a flange 23 on the lower end, and is rotatable on the ribbon feed shaft 16 and can be rotated up and down. They are fitted together so that they can move freely.

A ring 24 is fitted above the flange 23 of the clutch 18 so as to be vertically movable.

Reference numeral 25 denotes a coil spring fitted to the lower side of the ribbon feed shaft 16, which is located inside the clutch 19 and has a lower end.
is pressed against the stopper 26 and its upper end is pressed against the upper inner real end of the clutch 19, and the clutch 19 is pressed upward to the connected position where the saw teeth 21 are engaged with the saw teeth 20 of the clutch 18 (
Fig. 3) It is biased to maintain K.

27II'i A drive gear pivotally supported by a bearing 28 provided inside the rear side plate 3, whose front peripheral portion is connected to the gear 2 of the clutch 19.
2, and its rear peripheral portion protrudes from a portal 3a formed in the rear side plate 3 and engages with the rack 14.

Therefore, even when the carrier frame l moves to the left or right, the drive gear 27 rotates in a predetermined direction and the clutch 19 rotates.
It is designed so that it rotates only when it is connected to the K.

Reference numeral 29 denotes a ribbon holder in which ribbon cassettes 30.31 are superimposed, and it has a side wall around an oblong bottom plate 32, which has a through hole (not shown) formed in the center thereof into which the ribbon feed shaft 15.16 is fitted. 33 is provided, and a recess 34 for the ribbon to enter and exit is formed in the front central portion of the side wall 33, and regulating members 35 and 36 are attached to the left and right outer sides of the recess 34. .

Further, a horizontally elongated window hole 37 is formed in the rear portion of the side wall 33, and a locking heir 38 is attached to the side thereof so as to be able to move left and right.

The ribbon holder 29 is mounted on the upper side of the carrier frame 1 so as to be movable up and down by lift plates 39 and 40 attached to the left and right sides of the bottom, and the ribbon feed shaft 15 and 16 protrude from the through hole of the bottom plate 32.・Place the ribbon cassette 31 of the collect ribbon at the bottom and the ribbon cassette 30 of the print ribbon at the top, and insert the ribbon foot shafts 15 and 16 into each reel 41 and 42 (only the left side is shown). are doing.

Ribbon cassette 30 placed on the ribbon holder 29,
A wall 33 is in contact with the periphery of the ribbon cassette 31, and regulating members 35 and 36 are in contact with the left and right sides of the ribbon cassette. In addition, the heir 44 and the hanging piece 45 of the ribbon cassette 30
protrudes above the rear portion of the side wall 33, and when the recess 46 of the locking heir 38 is fitted into this locking piece 45, the ribbon cassette 30.31 is locked to prevent it from floating. ing.

The elevating plates 39 and 40 have an inverted shape and have their cheek side portions fixed downwardly to the ribbon holder 29, and elongated holes 47 formed in their long side portions.
4.7 into the pair of upper and lower guide pins 48.48 fixed to the inner surfaces of the left and right side plates 4.5 of the carrier frame 1, and a pair of lift cams 50 rotated by a motor 49 capable of
．． 51 to move up and down.

That is, the above-mentioned lift cams 50, 51+d are disk-shaped, and the current cam grooves 52, 53 are formed on one side, gears 54, 55 for preventing blind movement are integrally formed on the other side, and a known spring clutch is installed on the four inner parts. (not shown), which are fitted to the left and right sides of a shaft 56 that is horizontally suspended between the left and right sides plates 4 and 5 of the carrier frame 1, respectively, to drive the left and right cams 52 and 53, respectively. , facing the right side plates 4 and 5, and is configured to rotate only in a predetermined direction corresponding to forward rotation of the motor 49 by a spring clutch.

Reference numeral 57 denotes a drive gear fitted to the shaft 56, which meshes with the reduction gear 60 of the reduction gears 58, 59, and 60 pivotally supported on the bottom plate 6, and causes the reduction gear 58 to drive the motor 49. Gear 61 is engaged.

When the motor 49 rotates forward or backward, the shaft 56 also rotates forward or backward, and only when the motor 49 rotates forward, the lift cams 50, 51 rotate in a predetermined direction.

Reference numerals 62 and 63 designate a pair of lift levers, a lift lever 62 is arranged between the elevating plate 39 and the lift cam 50, and a lift lever 63 is arranged between the elevating plate 40 and the lift cam 51. A bin 68.69 is rotatably supported on the inner surface of the lift plate 39.
is inserted.

In addition, the lift cams 50 and 71 are attached to the inner surfaces of the front sides of these lift levers 62 and 63, respectively.
．． It is fitted into the cam grooves 52 and 53 of 51.

Therefore, during a printing operation, the ribbon holder 29 is in the lower position (single-dot chain # in FIG. 2), and printing is possible using the print ribbon (not shown) of the ribbon cassette 30 and the thermal print head 72. and (7) the bins 70 and 71 of the lift levers 62 and 63 are in the cam position. Groove 52
．． 53 is located at the maximum diameter part of the underwear, and the cam grooves 52, 5
3 is in a state in which the left and right sides of the diameter line passing through the bins 70 and 71 have a symmetrical shape (FIG. 2).

However, when performing a collect operation, the motor 49 is rotated forward and the lift cams 50 and 51 are rotated in a predetermined direction (counterclockwise direction in Figure 2).
When the pin 70.71 is turned half a turn to the cam groove 52.53
When the lift levers 62 and 63 rotate in a predetermined direction (clockwise in the figure), the lift plate 39
40 rises, and the ribbon holder 29 is displaced to the upper position (double-dashed line in the figure).

As a result, the ribbon cassette 30.31 rises in the axial direction relative to the ribbon feed shaft 15.16, the printing ribbon of the ribbon cassette 30 becomes non-printing, and the reel 42 and drive pawl 17 are engaged. is detached and the ribbon is not fed, while the collect ribbon in the ribbon cassette 31 is not being used by the print head 72 (8
) The reel 41 is moved to the ribbon feeding enabled position where the driving claw 17 is engaged with the reel 41. Also, when switching from collect operation to print operation, the motor 49
The bottle 70.71 returns to its original position and the lift levers 62, 63 are moved in the specified direction (counterclockwise in Figure 2). The ribbon holder 29 and the ribbon holder 30 and 31 are returned to their original positions as the lifting plate 39 and 40 are lowered, and the printing ribbon is returned to the printing position and the position where the ribbon can be fed.

The print head 72 has a vertically long rectangular plate shape, and has a shaft 75 mounted on a bearing 74 on the upper surface Kvtl of the front side of the bottom plate 6 of the carrier frame 1.
It is attached to a bolt 76 which is rotatably supported by a bolt.

The holder 76 has a lower end protruding from an open lower 7 formed on the bottom plate 6, and is biased to rotate in the direction of the platen 11 by a tension spring 78 stretched between the protruding end and the bottom plate 6. At the same time, the front end of the head lever 79 is fixed to the rear side of the head lever 79.
6 is engaged with a head cam 81 fitted into the center of the head.

The head cam 811fi is a modified fan-shaped plate in which a large-diameter circular arc portion 81m and a small-diameter circular arc portion 81b are arranged opposite each other, and a fan-shaped feed release cam 82 is integrally formed on the negative side, and a gear 83 for preventing blind movement is provided on the other side. The gear 8 is integrally formed.
A known spring clutch (not shown) is provided on the inner four parts of 3.

The head cam 81 and the feed release cam 82 are fitted onto the shaft 56 in parallel, and are rotated by a spring clutch in a predetermined direction corresponding to the reverse rotation of the motor 49 (clockwise in FIG. 3).
It is designed to rotate only when

When the printing head 72 is in the non-printing position K (FIG. 3), the pin 80 engages with the large-diameter circular arc portion 81aK of the head cam 81, and the head cam 81 is moved in a predetermined direction by the motor 49. When turned approximately half a turn, pin 8
0 and the circular arc portion 81m are disengaged, the head lever 79 and the holder 76 are rotated toward the platen 11 by the tension spring 78, the bottle 80 is engaged with the circular arc portion 81b, and the print head 72
is displaced to the printing position.

Further, when the head cam 81 is further rotated approximately half a turn in a predetermined direction from the above position, the pin 80 engages with the arc portion 81m, the head lever 79 retreats, and the holder 76 rotates against the tension spring 78 to print. The head 72 returns to the non-printing position.

84I/i feed release lever, it has a U-shape on the plane, and the long side part 84m and the rear end part of 84b are attached to the upper surface of the bottom plate 6 of the carrier frame l, and the shaft 8 is attached to the bearing 85.
A regulating portion 84c is rotatably supported at 6, and is bent and extended downward at right angles from the front side of the long side portion 84m, and is fitted into a slit 87 formed in the bottom plate 6. In addition, the long side portion 84
The elongated holes 88 and 89 formed in a e 84 b have (
11) Bins 90 and 91 protruding from both sides of the ring 240 fitted to the clutch 19 are fitted, and when the clutch 19 is connected to the clutch 18, the feed release lever 84 is in a horizontal state, A bin 92 attached to the long side portion 84m is positioned below -K opposite the small diameter portion 82a of the feed release cam 82.

When the intermediate frame 1 returns to the required position during the collect operation, the motor 49 is rotated in the opposite direction, the head cam 81 and the feed release cam 82 are rotated in a predetermined direction, and the print head 72 is displaced to the non-printing position. When the large diameter portion 82b of the feed release cam 82 engages with the pin 92 and presses it down, the feed release lever 84 rotates downward and the ring 24 is moved to the flange 2 of the clutch 19.
3, and the clutch 19 is connected to the coil spring 25.3. As a result, the saw teeth 21 and the saw teeth 20 are disengaged, and the clutch 19 and the clutch 18 are disconnected. - After that, the carrier frame 1 is moved to the required position (1
2) When moving to the left to return to step 2, the drive gear 27 meshing with the rack 14 rotates and the clutch 19 also rotates, but since the clutches 18 and 19 are not connected, the ribbon feed shaft 16 does not rotate. , neither the print ribbon nor the collect ribbon is ribbon fed.

In this way, it is only necessary to perform the required collection operation after the carrier frame l has returned to the required position.

93, 94, and 95 are gears for preventing blind motion, which are fitted to the shaft 96 that is horizontally suspended in front of the shaft 56 and parallel to the left and right side plates 4 and 5 of the carrier frame 1,
The gear 93 is engaged with the gear 54, the gear 94 is engaged with the gear 83, and the gear 95 is engaged with the gear 55, respectively, and the directions correspond to the gears 54, 55, and 83 engaged with each other by a known spring clutch (not shown). FIG. 6 shows another embodiment of the lift cam, in which the lift cam 97 rotates only when the ribbon holder is on top and inside.

A cam groove 98 for displacing to the lower three positions is provided, and although the shape of the cam groove 98 is different from that of the lift cam 50 * 51, the other configurations are the same.

As is clear from the above description, the present invention enables the displacement of the print head to the printing position, the displacement of the number of ribbons to the printing position, and the displacement of only the new ribbon to the position where the ribbon can be fed using a single motor. Compared to the case where a motor is installed for each displacement operation, it is economical because fewer motors are installed, and the configuration is simple, compact and lightweight, and the required There is no waste in feeding ribbons other than the ribbon.

[Brief explanation of the drawing]

The drawings show embodiments of the invention, with FIG. 1 being a plan view, FIG.
Figure 3 is a vertical left side view, Figure 4 is a diagonal (15) view of the ribbon holder with the ribbon cassette placed on it, Figure 5 is a vertical sectional view of the ribbon holder with the ribbon cassette placed on it, and Figure 6 is a vertical sectional view of the ribbon holder with the ribbon cassette placed on it. FIG. 3 is a side view showing another embodiment of the lift cam. 72...Print head, 49...Motor, 15.16
...Ribbon feed shaft. Patent applicant Silver Seiko Co., Ltd. Agent Patent Attorney Hara 1) Nobuichi Ni, -no (16)

Claims (1)

[Claims] 1. The motor displaces the print head to the printing position, and 1 the motor moves the plurality of ribbons in the axial direction of the ribbon feed shaft, displacing only the required ribbons to the printing position and the position where ribbon feeding is possible. A printing machine carrier characterized by: