JPH04130856U - Type wheel printer - Google Patents

Abstract

(57) [Summary] [Purpose] To properly match the locking recess of the selection ratchet to each detection code on the sensor plate, and to perform proper character selection. [Configuration] Connect the press-fit hole of the type gear 7 to the type shaft 1 of the type gear 7.
When the type gear 7 is press-fitted, the center of the type shaft 1 and the center of the type gear 7 are aligned, and each detection code of the sensor plate and each of the type wheels are It is possible to accurately detect the position of each typeface 3 by appropriately corresponding the typefaces 3, and to select an appropriate typeface.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to type wheel type printers, particularly those with multiple type bodies protruding from the outer circumferential surface. Each font on the font is selected by a selection plate that is rotated by an electromagnetic clutch. The present invention relates to a type wheel type printer that performs desired printing.

0002

[Conventional technology]

Figure 2 shows a conventional type wheel printer, in which the type wheel is rotated at a predetermined speed. A type shaft 1 is provided, and a locking groove 2 extending in the axial direction is provided on the outer peripheral surface of the type shaft 1. is formed. The type shaft 1 has a disk shape and has a plurality of desired type characters on its outer peripheral surface. A plurality of type rings 4 having protruding bodies 3, 3... are loosely fitted in parallel in the axial direction according to the number of digits. The type wheel 4 has locking recesses on the side thereof corresponding to each type body 3 of the type wheel 4. A selection ratchet 6 having portions 5, 5, . . . formed thereon is fixed integrally. Said selection la On one surface of the checket 6, there is a groove (not shown) whose tip is engaged with the locking groove 2 of the type shaft 1. A clutch spring is installed, which normally Rotate the character ring 4 together with the type shaft 1, and select the selection ratchet 6 into the locking recess 5. The type wheel 4 is stopped by the engagement of the selection plate, and the type shaft 1 of the clutch spring is stopped. By releasing the engagement with the locking groove 2, it is possible to rotate only the type shaft 1. It is now possible to do so.

0003 Further, as shown in FIG. 3, one end of the type shaft 1 is rotatably driven by a drive device. The press-fit hole 8 of the type gear 7 to be driven is press-fitted, and the transmission gear is By rotating the type gear 7 through the It is designed to be rotated by

0004 Further, a selection shaft 9 is arranged in the vicinity of the type shaft 1 so as to be rotatably driven, This selection shaft 9 has a rotating sleeve (not shown) that is rotationally driven integrally with the selection shaft 9. An electromagnetic clutch (not shown) is attached thereto. Further, the selection axis 9 includes: A selection plate 10 that is attracted and rotated by the electromagnetic clutch is attached to each selection plate 10. The selection plate 10 is arranged to correspond to the selection ratchet 6. A selection pawl 11 is provided in a protruding manner to be engaged with each locking recess 5 of the selection ratchet 6.

[0005] Furthermore, a sensor (not shown) for detecting the position of each type body 3 of the type wheel 4 A plate is attached to the sensor plate, and a timing plate is provided on the sensor plate corresponding to each typeface 3. A detection code is formed that outputs a signal pulse.

[0006] In the conventional type wheel type printer, the type shaft 1 is rotationally driven. While rotating the type wheel 4 and the selection ratchet 6, the sensor plate is rotated. energization control of the electromagnetic clutch based on timing pulses output from the electromagnetic clutch; By rotating the selection plate 10, the selection claw of the selection plate 10 is rotated. 11 into the locking recess 5 of the selection ratchet 6, and then move the type ring 4 to the desired type body. 3 is located at the printing position, and the desired type is selected. ing.

[0007] Thereafter, a hammer is placed in front of the desired type body 3 of the type wheel 4 selected as described above. A mechanism presses the paper (none of which are shown) through the ink ribbon. The printed characters of the printed type body 3 are transferred onto paper to perform desired printing. Ru.

[0008]

[Problem that the idea aims to solve]

In the conventional type wheel type printer, the type gear 7 is press-fitted as shown in FIG. When the hole 8 is press-fitted into the type shaft 1, the type gear 7 and the type shaft 1 are deformed, and as shown in FIG. As shown in , the type gear 7 is eccentric by the dimension A with respect to the type shaft 1, The center of the type gear 7 and the center of the type shaft 1 will not coincide. Besides that Therefore, when the type shaft 1 is rotationally driven via the type gear 7, the sensor plate is activated. If the sensor plate is attached to a shaft other than 1, the rotation of the shaft to which the sensor plate is attached The rotation of the type shaft 1 to which the type wheel 4 and selection ratchet 6 are attached is misaligned. Therefore, the engagement of the selection ratchet 6 with respect to each detection code of the sensor plate is There is a problem that the locking recess 5 does not respond properly, and as a result, It may not be possible to select the correct type, leading to printing errors and preventing proper printing. The problem is that it becomes impossible to do so.

[0009] This invention was made in view of the above points, and each detection code on the sensor board is The locking recess of the selection ratchet can be made to correspond appropriately to the selection ratchet, allowing for proper type selection. The purpose is to provide a type wheel printer that can Ru.

0010

[Means to solve the problem]

In order to achieve the above object, the type wheel type printer according to the present invention has a drive device at one end. The type shaft has a type gear fixed to it, which is rotated by A plurality of protruding type wheels are loosely fitted in parallel in accordance with the number of digits, and a selection ratchet in which a locking recess corresponding to each type body of the type ring is formed on the side of the ring; The clutch is fixed together, and the electromagnetic clutch is connected near the selection ratchet by energizing the electromagnetic clutch. A selection pawl is formed at the tip of the selection ratchet to be engaged with the locking recess of the selection ratchet. In a type wheel type printer which is provided with selection plates each having a The press-fit hole of the type gear is designed to compensate for the eccentricity that occurs when the type gear is press-fitted into the type shaft. Its distinctive feature is that it is eccentrically formed.

[0011]

[Effect]

According to the present invention, the press-fit hole of the type gear is formed eccentrically, and the type shaft of the type gear is formed eccentrically. The center of the type shaft and the center of the type gear are corrected when the type gear is press-fitted. Since it is possible to match the center of the type gear, each sensor plate The detection code and each typeface on the type ring can be properly matched, and the position of each typeface can be adjusted. It is possible to accurately detect the location and select appropriate type.

0012

【Example】 Hereinafter, an embodiment of the present invention will be described with reference to FIG.

[0013] Figure 1 shows an example of a type gear part applied to a type wheel type printer according to the present invention. This type is equipped with a type shaft 1 which is rotated at a predetermined speed. The shaft 1 includes a plurality of type wheels having a plurality of desired type bodies 3 protrudingly formed on the outer peripheral surface thereof, and This selection ratchet is formed with a locking recess corresponding to each type body 3 of this type wheel. They are loosely fitted in parallel in the axial direction according to the number of digits. Also, one end of the type shaft 1 A type gear is engaged with a transmission gear (not shown) that is rotationally driven by a drive device. 7 is press-fitted, and the drive device rotates the type gear 7 via the transmission gear. By rotating and driving, the type shaft 1 is rotated at a predetermined speed. There is.

[0014] Further, in this embodiment, the press-fit hole 8 of the type gear 7 is formed eccentrically. Due to this eccentricity, the activation occurs when press-fitting the type gear 7 into the type shaft 1. The eccentricity of the character gear 7 with respect to the type shaft 1 is corrected. That is, the above When the type gear 7 is press-fitted into the type shaft 1, the type gear 7 and the type shaft 1 are deformed. For example, suppose that the center of type gear 7 is eccentric by a dimension A with respect to the center of type shaft 1. Then, the press-fit hole 8 of the type gear 7 is moved in the opposite direction to the eccentric direction. It is made eccentric by a dimension B which is 1/2 of the dimension A. This allows the above-mentioned typeface to When the gear 7 is press-fitted, the center of the type shaft 1 and the center of the type gear 7 can be aligned. can.

[0015] Next, the operation of this embodiment will be explained.

[0016] First, while the drive device rotates the type shaft 1 at a predetermined speed, the sensor plate is rotated. The timing pulses output by each detection code cause the third position of each typeface on the typewheel to be detected. The position is detected, the electromagnetic clutch is energized, the selection plate is rotated, and the selection latch is activated. By stopping the print, the desired type 3 of the type wheel is placed in a predetermined printing position. Stop and type selection ends.

[0017] In this case, the press-fit hole 8 of the type gear 7 is formed eccentrically, and the press-fit hole 8 of the type gear 7 is formed eccentrically. Since the eccentricity that occurs when press-fitting into the type shaft 1 is corrected, the type gear 7. When press-fitting, the center of the type shaft 1 and the center of the type gear 7 can be aligned. , it is possible to obtain rotation of the type gear 7 with almost no eccentricity.

[0018] Therefore, in this embodiment, the press-fit hole 8 of the type gear 7 is formed eccentrically. When the type gear 7 is press-fitted, the center of the type shaft 1 and the center of the type gear 7 are aligned. Since each detection code on the sensor plate and each type ring can be The position of each typeface 3 can be accurately detected and the typefaces 3 can be properly corresponded to each other. This allows for proper type selection, prevents printing errors, and ensures proper printing. can become.

[0019] Note that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways as necessary. can be changed.

[0020]

[Effect of the idea]

As described above, the type wheel type printer according to the present invention has an eccentric press-fit hole in the type gear. When press-fitting the type gear, align the center of the type shaft with the center of the type gear. Each detection code on the sensor board and each type on the type wheel are It is possible to accurately detect the position of each typeface and select the appropriate typeface. As a result, printing errors can be prevented and proper printing can be performed. It has the effect of being able to

[Brief explanation of drawings]

[Fig. 1] A front view showing an embodiment of a type gear portion applied to a type wheel type printer according to the present invention.

[Figure 2] Partial side view showing a conventional type wheel printer

[Figure 3] Front view of conventional type gear part

[Fig. 4] Front view showing a conventional type gear press-fitted into a type shaft

[Explanation of symbols]

1 Type axis 2 Locking groove 7 Type gear 8 Press-fit hole

Claims (1)

[Scope of utility model registration request] Claim 1: A plurality of type wheels, each having a plurality of type bodies protruding from the outer peripheral surface, are movable in parallel according to the number of digits on a type shaft to which a type gear rotatably driven by a drive device is fixed to one end. At the same time, a selection ratchet in which a locking recess corresponding to each type body of the type ring is formed is integrally fixed to the side of the type ring, and a selection ratchet is attached near the selection ratchet by energizing an electromagnetic clutch. In a type wheel type printer, each of which is provided with a selection plate that rotates and has a selection pawl formed at its tip that engages with a locking recess of the selection ratchet, the press-fit hole of the type gear is connected to the press-fit hole of the type gear. What is claimed is: 1. A type wheel type printer, characterized in that the type is formed eccentrically so as to compensate for the eccentricity that occurs when the type is press-fitted into the type shaft.