JPH035312B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a printer using a type belt,
In particular, the present invention relates to a mechanism for adjusting the uprightness of the shaft of a drive pulley that drives the type belt.

Background of the Technology An outline of the main parts of this type of printer is shown in FIG. 1, where 1 is a drive pulley, 2 is an idler pulley, 3 is a type belt, 4 is a platen, and 5 is a hammer. As shown in FIGS. 2 and 3, the type belt 3 is an endless type belt integrally equipped with a large number of type characters 6 such as codes and numbers and a clock mark 7 corresponding to each of the type characters 6. 2 and is driven by the drive pulley 1 to travel in the direction of the arrow. The platen 4 is provided along one straight portion of the type belt 3, and a plurality of hammers 5 are arranged in parallel facing the platen 4 with the type belt 3 in between. An ink ribbon 8 and recording paper 9 are interposed between the hammer 5 and the type belt 3. The ink ribbon 8 moves in synchronization with the type belt 3, and the recording paper 9 is transported in a direction perpendicular to the plane of FIG. 1 at a predetermined time. During printing, a magnet (not shown) facing a predetermined hammer 5 is actuated at a predetermined time to activate the hammer 5 and press the recording paper 9 and the ink ribbon 8 against the type 6 of the type belt 3 on the platen 4. Printing is performed by.

In this type of printer, it is necessary to run the type belt 3 in a state where the type 6 directly faces the hammer 5 in order to perform accurate printing. One of the factors that impede accurate running of the type belt 3 is the uprightness of the pulley shaft, and it is desired that this uprightness can be freely adjusted.

Prior Art and Problems FIG. 4 shows a conventional adjustment mechanism in which the above-mentioned pulley axis uprightness adjustment is performed on the drive pulley side. In the figure, 1
0 is a support shaft (axis), 11 is a frame, and 12 is a shim. The support shaft 10 is fixed to the frame 11 by attaching a flange 13 integrally provided with the support shaft 10 to the frame 11 with screws 14, and the drive pulley 1 is attached to the support shaft 1.
0 through a bearing 15 so as to be rotatable.
The drive pulley 1 has a groove 16 for winding the drive belt.
is formed. The shim 12 is for adjusting the uprightness of the support shaft 10, and is used to adjust the uprightness of the support shaft 10.
It is inserted between 3. The uprightness of the support shaft 10 can be adjusted by appropriately selecting the thickness of the shim 12. The details of this adjustment procedure are as follows. The support shaft 10 is the fourth one when no shim is inserted.
It is tilted to the right side of the figure. When adjusting the uprightness of the support shaft 10, a known method such as measuring the height of the inlet side end surface of the type belt 3 with respect to the drive pulley 1 with a dial gauge 17 is used, and the height is adjusted while changing the thickness of the shim 12. The optimal shim thickness is determined by rotating the drive pulley 1 each time and measuring the height of the belt end surface. In this case, as the thickness of the shim 12 increases, the support shaft 10 tilts to the left in FIG. 4, and the height of the belt end surface at the measurement position becomes lower.

However, such conventional adjustment is very troublesome, and improvements are desired.

Purpose of the Invention The present invention is intended to realize the above-mentioned desire.
It is an object of the present invention to provide a simple uprightness adjusting mechanism capable of easily adjusting the uprightness of a drive pulley shaft.

Structure of the Invention In the present invention, an elastic plate-like member is provided which is fixed to the frame at two places at one end and at least one place at the other end, and the plate-like member has an elastic plate member fixed to the frame at one end. The shaft of the drive pulley is attached between the fixing location of the other end of the plate-shaped member and the shaft of the drive pulley, and the drive pulley is screwed onto the frame between the fixing location of the other end of the plate member and the shaft of the drive pulley. The above object is achieved by employing a configuration including a push screw that presses a shaped member to elastically deform it.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described with reference to FIGS. 5 to 9.

FIG. 5 is a front view showing an embodiment of the uprightness adjustment mechanism for a pulley shaft for a type belt according to the present invention, and FIG. 6 is an exploded perspective view of the same. ), 22 is a set screw. It should be noted that members having the same configuration as the conventional one are given the same reference numerals as the conventional one.

The support plate 21 is attached to the frame 11 and has a pair of slits 23, 23 at one end in the direction in which both pulleys are arranged side by side. This attachment is performed on the support plate 21 near the outside of the slits 23, 23.
The support plate 2 is pushed into the holes 24, 24 formed in the support plate 2.
This is done by tightening the screws 26, 26 that are screwed into the screw holes 1 and 29 that are inserted into the hole 27 formed at the center of the other end of the support plate 21 and screwed into the screw holes 28 of the support plate 21, respectively. be exposed. The support shaft 10 that supports the drive pulley 1 is fixed to the support plate 21 with screws 14.
The hole 30 formed in the support plate 21 is similar to the hole 24 in the support plate 21.
It is located at a position slightly shifted toward the hole 27 side from the line connecting the centers of the holes 24. That is, the support shaft 10 is close to the first fixing location between the first fixing location by the screws 26, 26 and the second fixing location by the screw 27.

Note that when attaching the support plate 21 described above, a shim 25 of an appropriate thickness is inserted between the frame 11 and the support plate 21 concentrically with the screws 14, and the support plate is pressed by the push screw 22, which will be described later. The support shaft 10 must be tilted to the right in FIG. 5 when not in use, but this can also be achieved by, for example, leaving the bottom of the flange 13 oblique without using shims. be.

The set screw 22 connects the second fixing point and the support shaft 1.
The support plate 21 is screwed onto the frame 11 between 0 and 10, and is adapted to press the support plate 21 when rotated in one direction by a screwdriver or the like.

The uprightness adjustment mechanism according to the present invention is constructed as described above, and its effects will be explained next.

The uprightness of the support shaft 10 can be adjusted by adjusting the amount of rotation of the set screw 22. That is, when the set screw 22 is rotated in a predetermined direction, the set screw 2
2 protrudes above the frame 11 as shown in FIG. Slits 23, 23 located nearby are formed, and the support plate 2
1 is easily deformed using these fixing points as fulcrums, the support plate 21 is elastically deformed in a substantially rectangular shape with the presser screw 22 as the bending point, as shown in FIG. , the support shaft 10 is tilted to the left in FIG. The amount of this inclination is proportional to the amount of rotation of the set screw 22 (the amount of protrusion from the frame 11). Therefore, by rotating the push screw 22 by a desired amount while measuring the position of the type belt end surface using a known type belt end surface position measuring means such as a dial gauge as described above, the uprightness of the support shaft 10 can be adjusted to a desired state. can be easily adjusted.

In this case, if a mechanism for adjusting the uprightness of the support shaft (shaft) of the idler pulley is also used, the height of the type belt on the idler pulley side can also be adjusted, and even more effects can be obtained.

The uprightness of the idler pulley support shaft can be easily adjusted using the adjustment mechanism shown in FIGS. 7 to 9. FIG. 7 is a front view of the adjustment mechanism, and FIGS. 8 and 9 are perspective views of the main parts thereof. In the figures, 31 is a slider, 32 is a support shaft of the idler pulley 2, and 33 is a spring. The construction and operation of this adjustment mechanism are as follows.

The slider 31 includes a slit 34 and a square hole 35, as well as a pair of guide portions 36 and a pair of semi-cylindrical convex portions 37.
is provided with a threaded portion 38, and the threaded portion 38 is inserted into the square hole 35.
It is held by the slider 31 by being screwed onto a nut-shaped member 39 inserted therein. The support shaft 32 is fixed by tightening a lock nut 40 that is screwed into the threaded portion 38 from below the slider 31. The slider 31 is inserted into the slit 34 from below, and the flange 41 is inserted into a bush-like member 42 that is engaged with the periphery of the slit 34, and is inserted into the bush-like member 42 by an adjustment bolt 43 that is screwed into the frame 11. supported by the frame 11
The protrusion 37 is biased by a spring 33 stretched between the frame 11 and the nut-shaped member 39 so that the convex portion 37 is positioned in the state shown in FIG. Note that the axis of the adjustment bolt 43 is located on a plane passing through the support shafts of both pulleys. In this state, the guide portion 36 of the slider 31 is attached to the frame 11.
Since the slider 31 is engaged with the inner periphery of the hole 44, rotation of the slider 31 about the axis of the adjustment bolt 43 is prevented, and the slider 31 is reliably positioned. The idler pulley 2 is supported by a bearing 45 on a portion of the support shaft 32 that protrudes from the frame 11 . A spring 3 applies tension to the type belt that wraps around this idler pulley 2.
3.

When adjusting the uprightness of the support shaft 32, the adjustment bolt 43 is rotated by a predetermined amount in the forward or reverse direction. When the adjustment bolt 43 is rotated in the forward direction (clockwise direction if the adjustment bolt has a right-hand thread),
The adjustment bolt 43 is raised, the support shaft 32 is tilted to the right in FIG. 7, and the type belt is lowered. Further, when the adjusting bolt 43 is rotated in the opposite direction, the adjusting bolt 43 is lowered, the support shaft 32 is tilted to the left in FIG. 7, and the type belt is raised. These support shafts 3
2 is smoothly realized by the convex portion 37 that engages with the frame 11 rolling while sliding over the back of the frame 11 (the outer periphery of the hole 44).
During this adjustment, the lock nut 46 for securely fixing the adjustment bolt 43 is loosened once, and after the adjustment is completed, the lock nut 46 is tightened. Since the type belt release knob 47 shown in FIG. 7 is used when removing the type belt, it is provided with an eccentric engagement portion 48 and is rotatable around the axis of the fixing bolt 49. When removing the type belt, the fixing bolt 49 is once loosened and the knob 47 is rotated by a predetermined amount. At this time,
Since the eccentric engaging portion 48 engages with the edge 50 of the slider 31 and moves the slider 31 to the left in FIG. 7 by a predetermined amount, the support shaft 32 also moves together with the slider 31, making it possible to remove the type belt. . When putting on a new type belt, it is sufficient to return the knob 47 to its original state. The pin 51 shown in FIGS. 7, 8, and 9 is for preventing the slider 31 from falling when the spring 33 is not attached. It is locked in.

Effects of the Invention As described above, according to the present invention, the following various excellent effects can be achieved.

(1) The uprightness of the support shaft can be adjusted by elastically deforming the support plate to which the support shaft of the drive pulley is attached simply by rotating the push screw, and the adjustment work is extremely easy.

(2) The structure is extremely simple, requiring only a support plate with a slit, a screw for fixing the support plate, and a set screw for adjustment.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a printer using a type belt, Fig. 2 is a perspective view of the type belt, Fig. 3 is a sectional view thereof, and Fig. 4 is a front view of a conventional drive pulley shaft uprightness adjustment mechanism. 5 to 9 show an embodiment of the uprightness adjustment mechanism for a pulley shaft for a type belt according to the present invention, FIG. 5 is a front view of the uprightness adjustment mechanism, and FIG. 6 is an exploded perspective view of the uprightness adjustment mechanism. , FIG. 7 is a front view of an idler pulley shaft uprightness adjustment mechanism that can be used in conjunction with the present invention, and FIGS. 8 and 9 are perspective views showing the main parts of FIG. 7. In the figure, 1 is a drive pulley, 2 is an idler pulley, 3 is a type belt, 6 is a type, 10 is a support shaft (shaft), 21 is a support plate (plate-shaped member), 22 is a set screw,
23 is a slit, 24, 27 and 30 are holes, 25 is a shim, and 26 and 29 are screws.

Claims (1)

[Claims] 1. In a printer that prints with type on a type belt stretched between a drive pulley and an idler pulley, each supported by two shafts provided on a frame, one end in the direction along the direction in which both pulleys are arranged side by side is A plate-like member having elasticity is provided, the other end of which is fixed to the frame at at least one or more places, respectively, and the drive pulley is fixed between one end of the plate-like member and the other end of the plate-like member. At the same time, a push screw is screwed into the frame between the other end fixing point of the plate-like member and the shaft of the drive pulley, and presses the plate-like member to elastically deform it when rotating in one direction. A mechanism for adjusting the uprightness of a pulley shaft for a type belt.