JP3433971B2 - Elevating table mechanism for multi-head sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting mechanism for a table of a multi-head sewing machine, and more particularly, to an urging force for raising and lowering the table before the table reaches a position where the table can be raised to a maximum. and de-energized
A multi-head sewing machine set up so that the table temporarily stops . Conventionally, a multi-head sewing machine provided with a plurality of sewing machine arms has been put to practical use. This multi-head sewing machine
A plurality of single-head sewing machines are arranged at predetermined intervals on the upper surface of the base frame, and the same embroidery pattern can be simultaneously formed on a number of flat work cloths corresponding to the number of these single-head sewing machines.
A movable frame for mounting a plurality of flat frames holding these work cloths is provided on the operation table. The movable frame is configured to be driven in the X-axis direction via an X-axis drive mechanism, and to be driven in the Y-axis direction via a Y-axis drive mechanism. In this type of multi-head sewing machine, a hat frame for performing embroidery on a curved hat is also used instead of a flat frame used for forming an embroidery pattern on a flat work cloth. It is configured to be attachable to a cylinder bed connected to the tip of the. Therefore, in order to mount the cap frame to the cylinder bed, the table is moved by a predetermined distance from a position (hereinafter, referred to as an ascending position) when a flat frame having a height corresponding to the upper surface of the cylinder bed is mounted. There is provided an elevating mechanism for a table including a guide mechanism for elevating the table to a position lowered only below (hereinafter referred to as a lowered position). In the above-described table elevating mechanism, the table is configured to be raised from the lowered position to the raised position by a biasing means such as a gas cylinder, so that the table can be surely reached the raised position. The urging force of the urging means is set to an urging force for pushing the table higher than the raised position, and is stopped at the raised position by the stopper. [0005] Since the elevating table mechanism raises the table by an urging force that pushes the table to a position higher than the raised position, the worker moves between the table and the base frame when the table is raised. There is a problem that your hand or work cloth is pinched. By the way, if the urging force of the urging means is set to deactivate before the table reaches the ascending position, in order to raise the table stopped below the ascending position to the ascending position, the urging means is forcibly raised. Since it has to be extended beyond the stroke, a large pulling force is required, and the biasing means is easily damaged. [0006] The present invention, which was made to solve the above problems, and its object is urging force Ru raises the table is de-energized before reaching the raised position tape
Bull is to provide a liftable table mechanism of the multi-head sewing machine to be able to lift once with slight force even stops tables co If set to stop. [0007] Means for Solving the Problems] liftable table mechanism of the multi-head sewing machine 請 Motomeko 1, in multi-head sewing machine equipped with common elevating table for the plurality of the sewing machine, the base frame to the table A first urging means for urging the table in the ascending direction with an urging force that decreases with an increase in the ascent stroke of the table; And a second urging means for urging in a descending direction with an urging force which increases in accordance with the increase of the urging force, wherein the urging force of the second urging means and the urging force of the second urging means are adjusted before the table reaches the maximum raised top position. The characteristics of the first urging means and the second urging means are set such that the urging forces of the first urging means are balanced and the table stops once . [0008] In the liftable table mechanism of the multi-head sewing machines of the action] 請 Motomeko 1, first for biasing the rising direction smaller biasing force in response to the increase in the rising stroke of the table to be raised and lowered through the guide mechanism The table is raised to the maximum position where the urging force of the urging means and the second urging means which urges in the downward direction with the second urging force which increases in accordance with the increase of the rising stroke are balanced. Since the table is set before reaching the top position, the table at the time of ascent is stopped at this equilibrium position. Therefore, when the table is raised, it is possible to prevent an accident in which an operator's hand or a work cloth is caught between the table and the base frame. Further, the table in the stopped state can be moved up and down by a small force that opposes the urging force of the difference between the urging forces of the first urging unit and the second urging unit that urge in opposite directions. Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a multi-head embroidery machine having three embroidery sewing machines. The multi-head embroidery machine will be described. As shown in FIGS. 1 and 2, the multi-head embroidery machine M is provided with a plane having a predetermined length in the left-right direction on the rear side of the upper surface of the base frame 1 extending in the left-right direction. A sewing machine support plate 2 having a rectangular shape as viewed is provided, and three embroidery sewing machines MH are arranged on the sewing machine support plate 2 in a row at predetermined intervals in the left-right direction. On the head of the arm 3 of these embroidery sewing machines MH, 12 needle bars (not shown) are provided.
Is mounted, and a needle bar for forming an embroidery pattern with an embroidery thread of a desired color can be selectively selected. On the other hand, a bed 6 at the lower end of the pillar 5 connected to the arm 3 is mounted on the sewing machine support plate 2, and a cylinder bed 7 extends forward from a front end of the bed 6. A thread assisting device (not shown) is provided at the tip of the bed 7, and a seam is formed on a work cloth with an embroidery thread of a desired color in cooperation with a sewing needle attached to a selected needle bar. It has become so. Here, an upper shaft (not shown) for vertically moving the needle bar and the balance 8 and a lower shaft (not shown) for rotating the thread assisting device are rotated by a V-belt 9 connected to a sewing machine motor (not shown). It is driven by a driven drive shaft. The table 1 is arranged so that it is substantially flush with the upper surface of the cylinder bed 7 in front of the sewing machine support plate 2.
A movable frame 13 having a rectangular shape in a plan view extending in the left-right direction is placed over the auxiliary tables 11 and 12 provided on the right and left sides of the table 10 including the table 10. . The drive frame 13a at the right end of the movable frame 13 is driven to move in the X-axis direction (left-right direction) by an X-axis drive mechanism (not shown), and the drive frame 13b at the left end is driven by the Y- axis. It is configured to be driven to move in the Y-axis direction (front-back direction ) by a mechanism (not shown). Therefore, the movable frame 13 is movable on the XY plane . The central portion of the lower surface of the front Symbol table 10 is arranged a table support plate 14, the table support plate 14 is configured to lift is supported by the guide mechanism 20 described later. Next, a pair of left and right guide mechanisms 20 for switching the table 10 between a raised position and a lowered position.
Will be described with reference to FIGS. At the center of the lower surface of the table 10, a table support plate 14 is disposed. At both left and right ends of the table support plate 1, vertically extending C-shaped channels 21 are provided with their openings facing inward at the upper ends. It is fixed with. Since the two guide mechanisms 20 have the same configuration, only the right guide mechanism 20 will be described. A slider 23 of a slide guide 22 is screwed to the right end surface of the lower end of the C-shaped channel 21, and a slide rail 24 is slidably fitted to the slider 23 via a ball 24a. Is a substantially L-shaped mounting member 25 fixed to the base frame 1 in plan view.
Mounted on On the other hand, a pair of left and right gas cylinders 26 for urging the table 10 upward and a pair of right and left coil springs 27 for urging the table 10 downward are provided.
Each upper end is pivotally attached to the left and right sides of the table support plate 14, and the lower end is pivotally attached to the lower end of the base frame 1. The gas cylinder 26 (corresponding to a first urging means of the present invention) urges the table 10 in an ascending direction with an urging force that decreases with an increase in the ascent stroke.
Coil spring 27 (corresponding to the second biasing means of the present invention)
Urges the table 10 in the descending direction with an urging force that increases as the ascent stroke increases. As shown in the graph of FIG. 11, the urging force of the gas cylinder 26 shown by the solid line in the figure and the urging force of the coil spring 27 shown by the chain line in the figure are:
When the table is raised, the balance is set at the position A, and when the table is lowered, the balance is set at the position B. Therefore, when lifting the table 10 at the lower position to the upper position, the table at the lower position
The urging force of the difference between the upward urging force of the gas cylinder 26 and the downward urging force of the coil spring 27 is pushed upward,
It stops at the position A where the urging forces of the gas cylinder 26 and the coil spring 27 are balanced. From the position A to the ascending position, the operator lifts up to the ascending position by a force opposing an urging force of a difference between the urging force of the coil spring 27 downward and the urging force of the gas cylinder 26 upward. On the other hand, since the downward urging force of the coil spring 27 is greater than the upward urging force of the gas cylinder 26 in the table 10 at the ascending position, the table 10 is only pushed lightly downward, and the downward urging force of the coil spring 27 is applied. B
Descent to position and stop. The table 10 between the position B and the lowered position is moved by the operator to the gas cylinder 26.
Is depressed by a force opposing the urging force of the difference between the urging force of the coil spring 27 and the urging force of the coil spring 27. Therefore, the table 10 is temporarily stopped when ascending, and is pushed up by the operator from this stop position to the ascending position with a slight force. In addition, when descending, it is configured to descend only by pushing with a slight force. Next, the table 10 at the ascending position is moved from the position at which the table 10 is moved up and down by the guide mechanism 20 (corresponding to the up / down position according to the present invention; this position is hereinafter referred to as the up / down position). Rear end support mechanism 40
Table support plate 1 until a position (corresponding to a use position of the present invention; hereinafter referred to as a use position) supported by the
The slide guide mechanism 30 that slides back and forth with respect to the slide 4 will be described. As shown in FIGS. 5, 7, 9 and 10, the slide guide mechanism 30 has a table support plate 14 for supporting the lower surface of the table 10 at the center and the rear end on both sides thereof. A set of long holes 3 each having a predetermined length in the front-rear direction
1 and a pair of guide edges 32a that extend linearly in the front-rear direction are formed in the cut portions 32 formed at positions corresponding to the sewing machine arm portions 3. On the other hand, on the lower surface of the table 10, a pin member 33 that fits into the elongated hole 31 is provided.
Further, a guide plate 34 is projected from the lower surface of the table 10 so that one side edge is guided by the guide edge 32a. Then, the table 10 is placed on the table support plate 14, the pin member 33 is fitted into the elongated hole 31 formed in the table support plate 14, and the side edge of the guide plate 34 is brought into contact with the guide edge 32a of the table support plate. It is placed. Therefore, the table 10 has a long hole 31 provided in the table support plate 14 to restrict the sliding range in the front-rear direction, and the long hole 31 and the guide edge 32a restrict the swing in the left-right direction. 10 is going up and down
It is slid back and forth from the possible position to the use position. When the slide guide mechanism 30 is not used, the table 10 and the table support plate 14 are integrated by a connection screw 35 engaged from the lower surface of the table support plate 14. A pair of handles 36 are provided on the lower surface of the table 10. Further, a slider 37 is provided at the rear end of the table 10 to facilitate sliding movement of the table 10 at a predetermined interval. Next, the table rear end support mechanism 40 will be described. As shown in FIGS. 5 to 10, a table rear end support member 41 extending over the entire length of the base frame 1 in the left-right direction is provided at the rear of the upper surface. It said table rear supporting member 41, the standing portion 41 to the trailing edge of the horizontal table rear support portion 41b of the rear end portion of the table 10 is placed
a is erected, and an attachment portion 41c attached to the base frame 1 is continuously provided at the front edge. The standing plate portion 41a
On the rear end surface of the table 10, there is formed a pin hole 44 into which a pin member 43 protruding at a predetermined interval is fitted. Therefore, the table 10 at the raised position is
The slider 37 is easily slid rearward from the vertically movable position to the use position via the slide guide mechanism 30 with the aid of the slider 37, and the rear end of the table rear end support member 4
1 and is placed on the table rear end support portion 41b.
The pin member 43 provided on the rear end surface of the table 0 is fitted into the pin hole 44 of the upright portion 41a of the table rear end support member 41, and the rear end of the table 10 is securely supported. When the table 10 is in the use position, the rear end of the table 10 is supported by the table rear end support mechanism 40, the front part is supported by the table support plate 14, and both sides are supported by the base frame 1. It is configured to be supported by a support portion 45a connected to the upper edge of a trapezoidal support member 45 erected on both sides of the upper surface of the device.
Further, the table 10 and the table support plate 14 are locked by the lock member 47 (see FIG. 10 ). Therefore, the table 10 in the use position is provided with the rear end support mechanism 40.
, The table support plate 14 and the support member 45 assuredly. Here, the process of moving the table 10 from the use position to the vertically movable position via the slide guide mechanism 30 and reaching the lowered position via the guide mechanism 20 will be described. First, the rear end of the table 10 in the use position shown in FIGS. 4 and 5 is detached from the table rear end support mechanism 40, and the table 10 can be moved up and down shown in FIG. Move to the position. Next, the table 10 is pressed via the guide mechanism 20 to lower the table 10 to a lowering position shown in FIGS. At this time, as shown in FIG. 10, the lowering of the table 10 drawn forward as indicated by the dashed line is prevented by the support portions 45a of the support members 45 that support both side ends of the table 10 in the use position. Not like table 10
Notches 46 are formed at both ends of the support member 45 so that the support portion 45a of the support member 45 can be inserted therethrough. When the table 10 is lowered to the lowered position, the table 10 at the lowered position is locked by a lock mechanism 50 described later. Next, the lock mechanism 50 of the table 10 at the lower position will be described. As shown in FIGS. 4 and 6, a latch 51 is pivotably attached to each side of the lower surface of the table support plate 14.
A latch claw 51a is formed at the tip of
b is formed in a substantially V-shape in side view. Further, the latch member 51 is coupled to the spring <br/> member attached at one end to the base frame 1 side, is swung clockwise about the pivot the latch claw 51a is always engaged direction (latch member Direction). On the other hand, stoppers 53 with which the latch members 51 are engaged are provided on both front sides of the base frame 1. The stopper 53 has a configuration in which a stopper shaft 53b is mounted on a pair of inclined plates 53a inclined forward. When the table 10 is lowered, first, one inclined portion of the substantially V-shaped head 51b of the latching tool 51 comes into contact with the stopper shaft 53b of the stopper 53, and the latching tool 51 is tilted by one of the heads. parts is pressed by the stopper shaft 53b, it is swung in the direction opposite to the direction of engagement once the latch member 51 is anti to the spring <br/> member, further, by the table 10 is lowered, the latch member 51a
Is swung to the engagement direction by the elasticity of the spring member, the latch claw 51a of the latch member 51 is engaged with the stopper shaft 53b of the stopper 53, in the lowered position, the table 1
0 is locked. Accordingly, the latch mechanism 51 is automatically engaged with the stopper 53 by simply lowering the table 10 via the guide mechanism 20 by the above-described lock mechanism 50, and the table 10 is locked at the lowered position. . Also ,
To unlock this is released by operating the latch member 51. The operation of the elevating table mechanism described above will be supplementarily described. The urging force of the gas cylinder 26 that urges the table 10 upward and the coil spring 27 that urges the table 10 downward is set so as to be balanced between the ascending position and the descending position. Since the table 10 is stopped at the equilibrium position of the gas cylinder 26 and the coil spring 27, the hand of the worker or the work cloth is not pinched by the rising table 10. Also,
The table 10 in the stopped state can be moved up and down with a small force that opposes the difference in the urging force between the gas cylinder 26 and the coil spring 27 urged in opposite directions. As described above, according to the elevating table mechanism of the multi-head sewing machine according to the present invention, the first guide that guides in the ascending direction with the urging force that decreases as the ascending stroke of the table increases. And a second urging means for urging in the descending direction with an urging force that increases in accordance with the increase of the rising stroke of the table, and the urging force of these urging means is increased to the maximum of the table. Since the table is set to stop temporarily at the position before reaching the top position, the rising table stops temporarily between the lower position and the upper position, so the work between the table and the base frame is performed. It is possible to reliably prevent an accident in which a user's hand or a work cloth is caught. Further, since the first urging means and the second urging means urge in opposite directions, the table in the stopped state can be moved up and down with a small force.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view of a multi-head embroidery machine according to an embodiment of the present invention . FIG. 2 is a plan view of the multi- head embroidery machine. 3 is a cross-sectional plan view of the temperature descending guide supporting mechanism. [4] tables is a vertical sectional side showing the position of use. [5] tables is a plan view of an essential part showing a position of use. [6] tables is a vertical sectional side view showing a state in which the lowered position. [7] tables is a plan view of an essential part showing a state in which the lowered position. [8] tables is a vertical sectional side view showing a state in which the vertical position. FIG. 9 is a sectional view taken along line AA of FIG. 5; FIG. 10 is an enlarged plan view of a main part of FIG. 5; FIG. 11 is a graph showing characteristics of a gas cylinder and a coil spring. [Description of Signs] 1 Base frame, 10 Table 14 Table support plate, 20 Guide mechanism 22 Sliding guide, 26 Gas cylinder 27 Coil spring, 30 Slide guide support mechanism 31 Long hole, 34 Guide plate 40 Table rear end support mechanism, 41 table rear support member 43 pin members, 44 pin holes M multi-head embroidery machine, MH embroidery machine

Claims (1)

(57) [Claim 1] In a multi-head sewing machine provided with a common elevating table for a plurality of sewing machines, a guide mechanism for guiding the table so as to be able to move up and down with respect to a base frame; First urging means for urging the table in an ascending direction with an urging force that decreases as the ascending stroke increases; and descending direction with an urging force that increases as the ascending stroke increases. and a second biasing means for biasing f, before the table reaches the limit elevated top position, the urging force of the urging force of the first urging means of the second biasing means is balanced A characteristic of the first urging means and the second urging means is set so that the table temporarily stops .